JPH1184501A - Camera apparatus, lens device and camera system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To execute stable photographing without being influenced by the temperature change of a camera apparatus or/and a lens device under service environment by transmitting the detected temperature information of an optical block and fluctuation information being the reference of an image-formation surface associated with the temperature change of the optical block to the lens device at the time of attaching the optical block. SOLUTION: The main body microcomputer 109 of a video camera main body 116 transmits detected temperature concerning a prism and temperature counting result BFPrr to a lens barrel when it is attached with the lens barrel. Then, the lens microcomputer 110 of a lens unit 115 calculates correction amount BFPrr and adds/subtracts it to/from lens cam data, so that excellent temperature compensation control is adaptively performed to environmental change such as temperature change. The driving of motors 111 and 113 is controlled by a motor control part 126, and the fluctuation of the position of the image- formation surface associated with the temperature change is corrected. Thus, the stable photographing is executed without being influenced by the temperature change under the service environment.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a detachable camera device, a lens device, and a camera system including these devices. In particular, a communication function is added to both the detachable camera device and the lens device, and information necessary for correcting the image plane position due to temperature change is transmitted from the camera device to the lens device, and based on the information, The present invention relates to a camera device, a lens device, and a camera system capable of performing stable photographing without being affected by a temperature change in a use environment by driving control of a movable lens group of an optical system by a lens device.

[0002]

2. Description of the Related Art In recent years, in the field of imaging devices such as an integrated video camera (hereinafter, referred to as a video camera), miniaturization and enhancement of functions have rapidly progressed, and the influence of temperature on images has become serious. Have been.

One of them is focus movement due to temperature. This is due not only to an increase in internal temperature due to an increase in power consumption due to miniaturization and high functionality, but also to a slight focus movement due to a decrease in the focus position accuracy, so-called depth of focus, allowed as the imaging size becomes smaller. It became a more important issue because it greatly affected the image.

To solve such a problem, Japanese Patent Laid-Open Publication No.
As shown in -289275, a temperature detecting means for detecting a use environment temperature is provided in the vicinity of a lens group of a lens device, and while monitoring the use environment temperature by the temperature detection means, the zoom tracking curve is sequentially changed to the environment temperature. A method of performing change control according to the change has been proposed.

[0005]

By the way, in the above-mentioned video camera, there has conventionally been a problem that the focus is deviated and an appropriate lens control is not performed due to a change in environment. In particular, as the image quality is improved by digital technology, the influence of the focus shift due to the environment of the optical system (photographing lens) becomes remarkable, and this is a very serious problem.

[0006] Furthermore, recent optical systems have increased zoom magnification,
Miniaturization is taking place ahead of schedule. Accordingly, the amount of defocus with respect to a predetermined imaging plane (for example, an imaging surface of an imaging device) of the optical system due to a temperature change, a humidity change, or the like tends to increase.

In particular, the tendency is remarkable in a video camera in which a subject image is formed on an image pickup device of a camera device via a color separation prism (optical block).

Therefore, it is extremely important to how to effectively correct the deviation of the image plane due to such environmental changes.

[0009] The same applies to further improvement of image quality, magnification, and miniaturization.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has information on a change in imaging surface (back focus) due to a change in temperature of an optical block when the lens is mounted on a lens device, and / or
It is another object of the present invention to provide a camera device capable of detecting a temperature for obtaining fluctuation information thereof and transmitting the detected temperature to a lens device.

Further, it is possible to obtain information on the change of the imaging surface due to the temperature change of the optical block on the camera device side and / or the information of the change of the image formation surface due to the temperature change of the optical system when the camera device is mounted. Accordingly, it is an object of the present invention to provide a lens device capable of correcting an image plane position due to a temperature change.

In addition, without being affected by a temperature change of a camera device and / or a lens device under a use environment,
It is an object of the present invention to provide a camera system capable of performing stable photographing.

[0013]

A camera device, a lens device and a camera system according to the present invention have the following features as means for achieving the above object.

The camera apparatus according to the present invention includes: [1]: a lens apparatus having an optical system including a moving lens group is detachably mounted, and a subject image formed on an image plane by the optical system of the lens apparatus. Is a camera device that captures an image via an optical block, and a temperature detection unit that detects a temperature of the optical block, and stores fluctuation information serving as a reference of the imaging plane due to a temperature change of the optical block,
And a control unit capable of communicating with the lens device, wherein the control unit detects temperature information of the optical block by the temperature detecting unit when the lens unit is mounted, and detects a temperature change of the optical block according to a temperature change of the optical block. It is characterized in that fluctuation information serving as a reference of an image forming plane is transmitted to the lens device.

[1-2]: A lens device having an optical system including a moving lens group is detachably mounted, and an object image formed on an image plane by the optical system of the lens device is optically blocked. A camera device for capturing an image via the optical device, comprising control means for storing fluctuation information serving as a reference of the imaging plane due to a temperature change of the optical block, and capable of communicating with the lens device. The means transmits, to the lens device, fluctuation information serving as a reference for the image plane due to a temperature change of the optical block when the optical device is mounted on the lens device.

In particular, [1-2-2]: in the camera device according to the above [1] or [1-2], the control means is a reference for the image plane according to a temperature change of the optical block of the storage means. [1-2-3]: In the camera device of the above [1] or [1-2], the control means is configured to transmit the fluctuation information as a fluctuation amount per unit temperature to the lens device. It is characterized in that fluctuation information serving as a reference of an imaging plane due to a temperature change of an optical block is stored as a fluctuation amount per unit temperature.

Further, the camera device of the present invention comprises: [1-3]: a lens device having an optical system including a moving lens group is detachably mounted, and is formed on an image plane by the optical system of the lens device. A camera device that captures an image of a subject through an optical block, comprising: a temperature detection unit that detects a temperature of the optical block; and a control unit that can communicate with the lens device. When the optical block is attached to the lens device, temperature information detected by the temperature detecting means of the optical block is transmitted to the lens device.

In particular, [1-4]: in the camera device according to the above [1-3], the control means stores identification information unique to the camera device, and stores the identification information when the lens device is attached to the lens device. It is characterized in that it is transmitted to a device.

The lens device according to the present invention includes: [2]: a lens device which is detachably mounted on a camera device for picking up an object image formed on an image forming surface via an optical block, and which is mounted on the image forming surface of the camera device. A lens device for forming a subject image via an optical block by an optical system including a moving lens group, wherein the lens driving means drives the moving lens group of the optical system; and Storage means for storing the control information of the optical device, and control means capable of communicating with the camera device, the control device comprising: Obtain fluctuation information serving as a reference of the imaging surface due to a temperature change of the block, and obtain temperature change information of the optical block and fluctuation information serving as a reference of the imaging surface due to a temperature change of the optical block. Based Correcting the control information of the storage means and controlling the lens driving means,
It is characterized in that the fluctuation of the image plane position due to the temperature change is corrected.

[2-2] A movable lens is detachably mounted on a camera device for picking up a subject image formed on the image forming surface via an optical block, and is mounted on the image forming surface of the camera device. A lens device that forms a subject image via an optical block by an optical system including a group, a temperature detecting unit that detects a temperature related to the optical system, a lens driving unit that drives a moving lens group of the optical system, Storage means for storing control information for controlling the driving of the movable lens group; and information for storing fluctuation information serving as a reference for the image plane due to a temperature change of the optical system, and communicating with the camera device Control means, the control means comprising, when the camera device is mounted on the camera device, temperature information on the optical block from the camera device, and fluctuation information serving as a reference for the imaging surface due to a temperature change of the optical block. Get Temperature change information of the optical block, fluctuation information serving as a reference of the imaging surface due to a temperature change of the optical block, temperature change information of temperature information detected by the temperature detecting means of the optical system, The control information of the storage unit is corrected based on the fluctuation information serving as a reference of the imaging plane due to the temperature change, and the lens driving unit is controlled to change the imaging plane position due to the temperature change. It is characterized by being corrected.

Also, [2-3]: a movable lens mounted on a camera device for picking up an image of a subject formed on the image forming surface via an optical block and detachably mounted on the image forming surface of the camera device. What is claimed is: 1. A lens device for forming a subject image via an optical block by an optical system including a group, comprising: lens driving means for driving a moving lens group of the optical system; and control information for controlling driving of the moving lens group. And control means for storing fluctuation information serving as a reference of the image plane due to a change in temperature of the optical system, and communicating with the camera device, and the control means includes: Obtaining temperature information on the optical block from the camera device at the time of mounting with the device, and fluctuation information serving as a reference of the imaging plane due to a temperature change of the optical block,
Temperature change information of the optical block, fluctuation information serving as a reference for the imaging surface due to the temperature change of the optical block, temperature difference information between a predetermined reference temperature of the optical system and temperature information of the optical block, and Correcting the control information of the storage means based on the fluctuation information serving as a reference of the imaging surface due to the temperature change of the optical system, and controlling the lens driving means, to thereby adjust the imaging surface caused by the temperature change. It is characterized in that the position fluctuation is corrected.

Also, [2-4]: a lens which is detachably mounted on a camera device for picking up a subject image formed on the image forming surface via an optical block, and is movable on the image forming surface of the camera device. A lens device that forms a subject image via an optical block by an optical system including a group, a temperature detecting unit that detects a temperature related to the optical system, a lens driving unit that drives a moving lens group of the optical system, Storage means for storing control information for controlling the driving of the movable lens group; and information for storing fluctuation information serving as a reference for the image plane due to a temperature change of the optical system, and communicating with the camera device A control unit capable of obtaining, from the camera device, fluctuation information serving as a reference of the imaging plane due to a temperature change of the optical block when the camera device is attached to the camera device, and obtaining a temperature of the optical block. The imaging with change Fluctuation information serving as a surface reference, temperature difference information between the detected temperature information of the optical system by the temperature detecting means and a predetermined reference temperature of the optical block, and temperature change information of the detected temperature information of the optical system; The control information of the storage unit is corrected based on fluctuation information serving as a reference of the image plane according to the temperature change of the optical system, and the lens driving unit is controlled to control the image plane position according to the temperature change. Is compensated for.

[2-5]: Removably mounted on a camera device for picking up a subject image formed on the image forming surface via an optical block, and a movable lens is provided on the image forming surface of the camera device. What is claimed is: 1. A lens device for forming a subject image via an optical block by an optical system including a group, comprising: lens driving means for driving a moving lens group of the optical system; and control information for controlling driving of the moving lens group. And control means for storing fluctuation information serving as a reference of the image plane according to a temperature change of the optical block of the camera device, and capable of communicating with the camera device. The means obtains temperature information on the optical block from the camera device when the camera is mounted on the camera device, and obtains information on a temperature change of the optical block and fluctuation information serving as a reference of the imaging plane due to the temperature change of the optical block. When The control information of the storage means is corrected based on the above, and the lens driving means is controlled to correct the fluctuation of the image plane position due to the temperature change.

[2-6]: Removably mounted on a camera device for picking up a subject image formed on the image forming surface via an optical block, and a movable lens is provided on the image forming surface of the camera device. A lens device that forms a subject image via an optical block by an optical system including a group, a temperature detecting unit that detects a temperature related to the optical system, a lens driving unit that drives a moving lens group of the optical system, Storage means for storing control information for controlling the driving of the moving lens group; fluctuation information serving as a reference of the image forming surface due to a temperature change of the optical block of the camera device; Control means for storing variation information serving as a reference of the image plane, and capable of communicating with the camera device, wherein the control device sends the optical block to the optical block when the camera device is mounted. Seki Temperature information of the optical block, temperature change information of the optical system detected by the temperature detecting means, and temperature change information serving as a reference of the imaging surface due to the temperature change of the optical block. The change information and the control information of the storage unit are corrected based on the change information serving as a reference of the imaging surface due to the temperature change of the optical system, and the lens driving unit is controlled,
It is characterized in that the fluctuation of the image plane position due to the temperature change is corrected.

In particular, [2-7]: In the lens device of the above [2-5] or [2-6], the control means controls the reference of the image plane according to a temperature change of the optical block of the camera device. [2-7-2]: In the lens device of [2-5] or [2-6], the control means is the camera device. Is characterized by storing, for each unique identification information set in advance, fluctuation information serving as a reference of the imaging plane due to a temperature change of the optical block.

The camera system of the present invention comprises: [3]: a camera device for picking up a subject image formed on an image forming plane via an optical block, and a movable lens detachably mounted on the camera device. A lens system for forming a subject image on the image forming surface via the optical block by an optical system including a group, wherein the camera device includes a temperature detecting unit configured to detect a temperature of the optical block. And control means for storing fluctuation information serving as a reference of the image plane due to a temperature change of the optical block, and capable of communicating with the lens device. Lens driving means for driving a lens group;
Storage means for storing control information for controlling the driving of the movable lens group; and control means capable of communicating with the camera device. The control device of the camera device is mounted on the lens device. Sometimes, the detected temperature information of the optical block by the temperature detecting means and the fluctuation information serving as a reference of the imaging plane due to the temperature change of the optical block are transmitted to the lens device, and the control means of the lens device Correcting the control information of the storage means and controlling the lens driving means based on the temperature change information of the optical block and the fluctuation information serving as a reference of the image forming surface due to the temperature change of the optical block, It is characterized in that the fluctuation of the image plane position due to the temperature change is corrected.

[3-2]: A camera device for picking up a subject image formed on an image forming surface via an optical block, and an optical system detachably mounted on the camera device and including a moving lens group A lens device for forming a subject image on the image forming surface via the optical block by using a camera device, wherein the camera device is configured to detect a temperature of the optical block, A control unit that stores information on a change in the image plane due to a temperature change and that can communicate with the lens device, wherein the lens device detects a temperature related to the optical system; Lens driving means for driving the moving lens group of the optical system, storage means for storing control information for controlling the driving of the moving lens group, and a reference for the image plane according to a temperature change of the optical system. Become Control means for storing fluctuation information and communicating with the camera device, wherein the control device of the camera device detects temperature information of the optical block by the temperature detecting means when the lens device is mounted. And fluctuation information serving as a reference for the imaging plane due to a temperature change of the optical block are transmitted to the lens device, and the control means of the lens device transmits temperature change information of the optical block and Fluctuation information serving as a reference for the imaging surface due to a temperature change, temperature change information of temperature information detected by the temperature detection means of the optical system, and reference to the imaging surface due to a temperature change of the optical system. It is characterized in that the control information of the storage means is corrected based on the fluctuation information and the lens driving means is controlled to correct the fluctuation of the image plane position due to the temperature change.

[3-3]: A camera device for picking up a subject image formed on an image forming plane via an optical block, and an optical system detachably mounted on the camera device and including a moving lens group A lens device for forming a subject image on the image forming surface via the optical block, wherein the camera device has a temperature detecting unit for detecting a temperature of the optical block, and a temperature of the optical block. Control means for storing change information serving as a reference for the image plane with the change, and capable of communicating with the lens device, wherein the lens device drives a moving lens group of an optical system. Means,
Storage means for storing control information for controlling the driving of the movable lens group; and information for storing fluctuation information serving as a reference for the image plane due to a temperature change of the optical system, and communicating with the camera device And control means of the camera device, wherein the control device of the camera device detects temperature information of the optical block by the temperature detecting device when the lens device is mounted, and the imaging surface according to a temperature change of the optical block. Is transmitted to the lens apparatus, and the control means of the lens apparatus transmits the temperature change information of the optical block and the fluctuation information to be a reference of the imaging surface due to the temperature change of the optical block. And a temperature difference information between a predetermined reference temperature of the optical system and temperature information of the optical block, and fluctuation information serving as a reference of the imaging surface due to a temperature change of the optical system. The control information is corrected and the lens is corrected. By controlling the moving means, it is characterized in that it is correct for variations in said imaging plane position caused by temperature changes.

Also, [3-4]: a camera device for picking up a subject image formed on an image forming surface via an optical block, and an optical system detachably mounted on the camera device and including a moving lens group And a lens device for forming a subject image on the image forming surface via the optical block, wherein the camera device has a reference variation of the image forming surface due to a temperature change of the optical block. Control means for storing information and communicating with the lens device, the lens device driving a temperature detecting means for detecting a temperature relating to the optical system, and driving a moving lens group of the optical system; Lens driving means, storage means for storing control information for controlling the driving of the moving lens group, and fluctuation information serving as a reference for the imaging plane due to a temperature change of the optical system, and the camera Mutual with the device Communicable control means, wherein the control means of the camera device transmits, to the lens device, fluctuation information serving as a reference of the image forming surface due to a temperature change of the optical block when the lens device is mounted. The control means of the lens device includes: fluctuation information serving as a reference of the image forming surface due to a temperature change of the optical block; temperature information detected by the temperature detecting means of the optical system; and a predetermined reference of the optical block. Control information of the storage means based on temperature difference information from the temperature, temperature change information of the detected temperature information of the optical system, and fluctuation information serving as a reference of the imaging surface due to the temperature change of the optical system. It is characterized in that the correction is made and the lens driving means is controlled to correct the fluctuation of the image plane position due to the temperature change.

[3-5]: A camera device for picking up a subject image formed on an image forming surface via an optical block, and an optical system detachably mounted on the camera device and including a moving lens group A lens device that forms a subject image on the image forming surface via the optical block by using a lens device, wherein the camera device detects a temperature of the optical block, A lens drive unit for driving a movable lens group of the optical system; and a storage unit for storing control information for controlling the drive of the movable lens group. And control means for storing fluctuation information serving as a reference for the image plane due to a temperature change of the optical block of the camera device, and capable of communicating with the camera device. The control unit transmits temperature information detected by the temperature detection unit of the optical block to the lens device when the lens unit is attached to the lens unit, and the control unit of the lens device includes temperature change information of temperature information on the optical block; The control information of the storage unit is corrected based on fluctuation information serving as a reference of the imaging surface due to the temperature change of the optical block, and the lens driving unit is controlled to adjust the position of the imaging surface according to the temperature change. Is characterized by correcting the fluctuation of

[3-6]: A camera device for picking up a subject image formed on an image forming plane via an optical block, and an optical system detachably mounted on the camera device and including a moving lens group A lens device that forms a subject image on the image forming surface via the optical block by using a lens device, wherein the camera device detects a temperature of the optical block, The lens device includes a temperature detecting unit that detects a temperature of the optical system, a lens driving unit that drives a moving lens group of the optical system, and a driving unit that drives the moving lens group. Storage means for storing control information for control; fluctuation information serving as a reference for the imaging surface due to a temperature change of the optical block of the camera device; and reference for the imaging surface due to a temperature change of the optical system And control means capable of mutually communicating with the camera device, wherein the control device of the camera device detects the temperature of the optical block when the lens block is mounted. Means for transmitting temperature information detected by the means to the lens device, and the control means of the lens device serves as a reference for the temperature change information of the detected temperature information of the optical block and the image forming surface due to the temperature change of the optical block. Control information of the storage means based on the fluctuation information, temperature change information of the detected temperature information of the optical system by the temperature detecting means, and fluctuation information serving as a reference of the imaging surface due to the temperature change of the optical system; And correcting the fluctuation of the image plane position due to a temperature change by controlling the lens driving means.

Particularly, [3-7-2]: [3], [3-2] or [3-
3] In the camera system according to 3), the control unit of the camera device transmits, to the lens device, fluctuation information serving as a reference of the imaging plane due to a temperature change of the optical block in a fluctuation amount per unit temperature. 3-7-3]: [3], [3-2] or [3-
[3] In the camera system of [3], the control means of the camera device stores, as an amount of variation per unit temperature, variation information serving as a reference of an imaging plane due to a temperature change of the optical block. -4]: In the camera system according to [3-5] or [3-6], the control unit of the camera device detects temperature information of the optical block at the time of correcting a change in the imaging plane position due to a temperature change. And [3-7-5]: the camera according to [3-5] or [3-6], wherein the detected temperature information and the current detected temperature information of the optical block are transmitted to the lens device. In the system, the control means of the camera device stores the detected temperature information of the optical block at the time of correcting the change of the image plane position due to the temperature change, and stores the detected temperature information and the current optical block information in the lens device. Temperature difference from detected temperature information [3-7-6]: In the camera system according to the above [3-5] or [3-6], the control means of the camera device stores identification information unique to the camera device and stores the identification information in the lens system. The identification information is transmitted to the lens device at the time of attachment to the device, and the control device of the lens device changes the reference plane of the image plane according to the temperature change of the optical block for each identification information unique to the camera device. It is characterized by storing information.

[0033]

BEST MODE FOR CARRYING OUT THE INVENTION

[Embodiment 1] This embodiment shows a video camera having an interchangeable lens system and an inner focus type lens configuration having a color separation prism as a camera system.

FIG. 1 is a cross-sectional view of a connection portion between a detachable video camera main body and a lens barrel constituting the video camera of this embodiment.

In FIG. 1, reference numeral 1 denotes a video camera body as a camera device, and 2 denotes a rotatable and detachable bayonet camera mount to which the video camera body 1 is fixed. Three mount claws 2b are formed.

Reference numeral 3 denotes a leaf spring for abutting a mount claw 12b of a lens mount 12 to be described later, and a close contact with a mount flange of both the camera mount 2 and the lens mount 12, and 4 denotes a screw for screwing a color separation prism unit to be described later. Reference numeral 5 denotes a camera-side contact stand, and 6 denotes a camera-side contact as an electrical connection terminal movably supported in an optical axis direction OO ′ that is a contact direction with the camera-side contact stand 5.

Reference numeral 7 denotes a conductive spring that elastically urges the camera-side contact 6 in the contact direction. Reference numeral 8 denotes a printed circuit board that is electrically connected to the camera-side contact 6 via the spring 7 at a position corresponding to the camera-side contact 6. The pattern is formed on the substrate.

Reference numeral 9 denotes a lens barrel as an interchangeable lens device which is detachably mounted on the video camera body 1;
9A is the external appearance of the lens barrel 9, 10 is 10a, 10
b, 10c, a lens group movable in the optical axis direction, for example, a focus lens group, 11 is a movable lens barrel holding the movable lens group 10, and 12 is a lens barrel 9
Is a bayonet-type lens mount that is fixed to the external lens barrel 9A and is detachable, and has a flange 12a serving as a reference in the optical axis direction and three mount claws 12b.

As shown in FIG. 2, the lens barrel 9 includes a first lens group 101 in addition to the focus lens group 10.
And a variator lens group 102, which is a second lens group for performing zooming, and a fixed third lens group 104, each of which has an optical system (photographing lens).
Is composed.

Reference numeral 13 denotes a lens-side contact block, and 14 denotes a lens-side contact as an electrical connection terminal fixed to the lens-side contact block 13 by, for example, insert molding. It is arranged so as to contact the side contact 6.

Reference numeral 15 designates the lens barrel 9 as the video camera body 1
A protective glass 16 for protecting the movable lens group 10, which is a movable part, from being directly touched when it is further detached;
Is a protective glass holder for holding the protective glass 15.

Reference numeral 17 denotes an optical low-pass filter for limiting high-frequency components of light entering the color separation prisms 18, 19, and 20 as optical blocks. Reference numerals 18, 19, and 20 denote first, second, and third prisms. 21, 22, 2
Reference numeral 3 denotes an image sensor, and 24 denotes a flexible substrate for electrically connecting the image sensors 21, 22, and 23.
It has a hard board part 24a, 24b, 24c which can be easily soldered to leads 22 and 23, and a connect part 24d connected to a camera electric board (not shown).

Reference numeral 25 denotes a temperature detecting element as temperature detecting means mounted on the flexible substrate 24, and reference numeral 26 denotes a shield plate for shielding the entire prism unit including the image pickup elements 21, 22, and 23.

In FIG. 1, the focus lens group 10,
The light beam that has passed through the protective glass 15 and the optical low-pass filter 17 is incident on an incident surface 18a of a first prism 18 disposed so as to be orthogonal to the optical axis, and is formed on a reflective surface inclined with respect to the optical axis of the incident light beam. The blue region light reflecting dichroic layer 18b reflects blue region light and transmits light of another wavelength.

In the second prism 19, the first prism 18
Is transmitted from the incident surface 19a, and the red light is reflected by the red light reflecting dichroic layer 19b formed on the reflecting surface inclined with respect to the optical axis of the incident light beam, and the green light is reflected. Through.

In the third prism 20, the second prism 19
Is transmitted through the incident surface 20a, and is guided to the image sensor 22 as it is.

As described above, the blue light reflected from the blue light reflecting dichroic layer 18b of the first prism 18 is totally reflected by the incident surface 18a of the first prism 18,
The light is incident on the image sensor 23 to form an image.

An air layer having a uniform thickness of 10 to 30 μm is formed between the first prism 18 and the second prism 19, whereby the transmitted light from the first prism 18 to the second prism 19 is formed. The transmission is not disturbed at all,
Moreover, the red light reflected by the dichroic layer 19b of the second prism 19 is incident on the incident surface 19 of the second prism 19.
a, it is possible to perform total reflection more reliably. The red light totally reflected here is incident on the image sensor 21 and forms an image.

In this manner, the dichroic layer 18 b for reflecting blue light of the first prism 18 and the second prism 19
Only the green light transmitted through the red light reflecting dichroic layer 19b is incident on the image sensor 22 and forms an image.

The optical system of the lens barrel 9 is formed such that each optical element (each lens group) forms a light beam from a subject at a predetermined position. On the side, it is necessary to arrange the imaging surfaces of the imaging elements 21, 22, and 23 at a fixed focus position which is always determined with reference to the flange 2a of the camera mount 2 which is a coupling portion with the lens barrel 9.

However, if the temperatures of the first prism 18, the second prism 19, and the third prism 20 rise due to a rise in the outside air temperature or a heat rise in the video camera main body 1, the first prism 18, the second prism 2 prism 19,
The third prism 20 extends in the direction of the optical axis, and as a result, the imaging surfaces of the imaging elements 21, 22, and 23 are located at positions farther from the focus position.

Therefore, in the present embodiment, the temperature change of the first prism 18, the second prism 19, and the third prism 20 is detected by the temperature detecting element 25, and the first prism 18, the second prism 18 due to the detected temperature change. 19. The extension amount of the third prism 20 is converted to the extension amount of the optical path length and transmitted to the lens barrel 9 side, and the image forming position on the lens barrel 9 side is determined by the optical path length (flange back) of the video camera body 1 side. The movement of the focus position due to a temperature change is corrected by moving the focus position by an amount corresponding to the extension.

Here, it is necessary for the temperature detecting element 25 to detect a temperature change of the first prism 18, the second prism 19 and the third prism 20, which occupy most of the optical path length on the video camera body 1 side. In many cases, it is necessary to surround the entire prism unit with the shield plate 26 in order to prevent the emission of noise from the imaging elements 21, 22, and 23 that require a high-speed drive pulse. Since the amount of heat generated is small, the temperature inside the shield plate 26 becomes almost uniform everywhere.

Accordingly, the temperature change of the first prism 18, the second prism 19, and the third prism 20 can be detected sufficiently accurately by the temperature detecting element 25 mounted on the flexible substrate 24. Further, a chip or a lead-shaped diode or the like is used as the temperature detecting element 25, but by arranging it on the flexible substrate 24,
Without using any new members for holding and electrical connection,
It can be easily attached and is advantageous in cost.

Next, an electric circuit configuration of the video camera according to the present embodiment will be described.

FIG. 2 is a block diagram showing an electric circuit configuration of the video camera according to this embodiment.

In FIG. 2, a light beam from a subject is a first lens group 101 to which an optical system in a lens unit (lens barrel) 115 is fixed, and a variator lens which is a second lens group for performing magnification change. A group 102, an aperture 103, a fixed third lens group 104, and a focus lens group 10, which is a fourth lens group, having both a focus adjustment function and a competition function for correcting a focus shift due to zooming. The red component of the three primary colors is placed on the image sensor 21 such as a CCD and the green component is placed on the CC by the above-described color separation prism (not shown) in the camera body (video camera body) 116.
The blue component is imaged on the image sensor 22 such as a CCD, and the blue component is imaged on the image sensor 23 such as a CCD.

The variator lens group 102 and the focus lens group 10 include an absolute position detecting device 10 such as an encoder.
Absolute positions are detected by 2A and 10A, respectively, and the detected information is supplied to a lens microcomputer 110 as control means of the lens device 9.

The respective images on the image pickup devices 21, 22, 23 are photoelectrically converted and amplified to optimal levels by amplifiers 105, 106, 107, respectively.
08 and is converted into a standard television signal (video signal), and at the same time, AF information is read out as data by the AF data reading program unit 121 of the main body microcomputer 109 as a control unit of the camera device as an AF evaluation value. It is.

The AF evaluation value read by the main microcomputer 109 is combined with switch information on the video camera main body 1 such as the ON / OFF state of an AF switch (not shown) and the state of a zoom switch (not shown). The signal is transferred to the lens microcomputer 110 through the contact 6 and the lens-side contact 14.

When the zoom switch is depressed, the lens microcomputer 110 sends a signal to the zoom motor driver 112 to drive the variator lens group 102 in the telephoto or wide depressed direction when the zoom switch is pressed. By transmitting a signal, the variator lens group 102 is driven via a zoom motor (lens driving means) 111 and, at the same time, control is performed based on lens cam data as control information previously stored in a cam data storage unit 125 of the lens microcomputer 110. By transmitting a signal to the focus motor driver 114 using the program of the unit 124 and moving the focus lens group 10 via the focus motor (lens driving unit) 113, a zoom operation without focus movement can be performed.

By the way, as in the present embodiment, in a type in which the correction lens (focus lens group 10) is located behind the variable magnification lens (variator lens group 102) on the optical axis,
The control position of the correction lens in a state where the focusing at the time of zooming is maintained changes depending on the subject distance, and the lens cam data includes a plurality of variator lens groups 102 as shown in FIG. And the absolute position of the subject distance (for example, 1 m, 2 m in FIG.
m), the position of the focus lens group 10 is stored, and the program of the control unit 124 is
A, variator lens group 102 detected by 10A
And a focus motor 11 using lens cam data selected by the absolute position information of the focus lens group 10.
3 is determined.

When the AF switch on the camera body 116 is ON, the AF control section 123 in the lens microcomputer 110 controls the control section 124 and the motor control so that the AF evaluation value from the body microcomputer 109 is maximized. A signal is sent to the focus motor driver 114 via the unit 126,
The automatic focus adjustment operation is performed by moving only the focus lens group 10.

Now, with respect to the driving of the correction lens based on the lens cam data as described above, it is necessary to determine the origin for ensuring an accurate back focus (hereinafter referred to as BF). The origin is determined by performing correction with a predetermined correction value based on the set reference position.

The predetermined correction value referred to here is a correction value possessed by the lens unit 115 (lens barrel) itself,
This is the total value of the correction values transmitted from the camera body 116.

The correction value possessed by the lens unit 115 itself includes a fixed value due to a variation or the like generated at the stage of manufacturing the lens unit 115 and a variable value caused by a temperature change on the optical system side. This is the total value.

The correction value transmitted from the camera body 116 is a variable value caused by a temperature change on the camera body 116 side, and uses an output signal detected by the temperature detection element 25 on the camera body 116 side. Camera body 116
This is a value given as change information of the flange back (hereinafter referred to as FB) on the side.

Next, the operation of correcting the temperature in the lens unit 115 after detecting the temperature in the camera body 116 will be described.

Temperature compensation data section 1 of main body microcomputer 109
Reference numeral 22 stores the amount of movement of the FB per unit temperature as fluctuation information serving as a reference for the image plane. Main body microcomputer 1
09 is the FB per unit temperature of the temperature compensation data section 122.
The movement amount of the camera body and the result of the environmental temperature change around the camera body 116 and the result of the temperature rise in the camera body 116 obtained by using the measurement value measured by the temperature detection element 25 are transmitted via the camera side contact 6 and the lens side contact 14. To the lens microcomputer 110.

The data from the main body microcomputer 109 is subjected to predetermined processing as a correction value in the control section 124 in the lens microcomputer 110.

Next, how the above-mentioned correction data is used in the processing of the lens movement control will be described.

The lens microcomputer 110 stores lens cam data as ideal values (design values) as shown in FIG. This is subjected to the following calculation for correction.

If the correction value (FB change information) transmitted from the camera body 116 is plus, the BF is longer than the ideal value, and as shown in FIG.
The value is subtracted from the ideal value of the lens cam data, and the value is subtracted from the ideal value. By performing the lens movement control using the renewed new data, it becomes possible to perform accurate zooming without causing blur.

Of course, if the correction value is minus, BF
Is smaller than the ideal value, and the lens cam data is read in parallel upward.

In this embodiment, for example, the camera body 1
The control unit 1 of the lens microcomputer 110 calculates a shift amount of the focus position (image plane position) due to the temperature change of the lens microcomputer 16.
Numeral 24 obtains, from the temperature compensation data unit 122 of the main body microcomputer 109, a deviation amount (variation information) serving as a reference of the imaging surface per unit temperature as a temperature counter BFTrr by communication.

This amount changes with temperature.
Temperature compensation data based on data obtained by previously calculating or actually measuring the amount of movement of the imaging plane due to the change in the BF position due to 8, 19, 20 or the change in the member holding the prisms 18, 19, 20 that changes the lens interval. Part 12
2 is stored.

Accordingly, if the temperature difference between the predetermined reference temperature TC0 on the camera body 116 side and the temperature detection output TC is ΔTC, the correction amount BFPrr can be easily calculated from the following equation.

BFPrr = ΔTC × BFTrr (1) This correction amount BFPrr is added to or subtracted from lens cam data at a certain predetermined position stored in accordance with a temperature change and a focal position of a lens, so that the change in the environment due to the temperature change can be prevented. On the other hand,
Good temperature compensation control can be performed adaptively.

That is, in the video camera of this embodiment,
The main body microcomputer 109 of the video camera main body 1 transmits the detected temperatures relating to the prisms 18, 19 and 20 and the temperature count BFTrr to the lens barrel 9 when the lens barrel 9 is mounted.
The lens microcomputer 110 of the lens unit 115 calculates the correction amount BFPrr according to the above equation (1), corrects the lens cam data, and controls the driving of the motors 111 and 113 by the motor control unit 126, so that the result of the temperature change is obtained. The fluctuation of the image plane position is corrected.

As a result, stable photographing can be performed without being affected by a temperature change in a use environment.

In this embodiment, it is more desirable that the temperature (detection temperature) for adjustment at the time of correcting the fluctuation of the imaging plane position is a predetermined reference temperature.

Further, it is needless to say that the temperature coefficient BFTrr is desirably set so that the fluctuation of the imaging plane position can be corrected under the condition close to the environmental condition where the video camera is frequently used.

Further, some of the above-mentioned temperature coefficients BFTrr are stored in advance in the lens microcomputer 110 of the lens unit 115 for each unique identification number (identification information) of the camera body 116, and when the camera is mounted on the camera body 116, It is also possible to configure such that the corresponding temperature coefficient BFTrr is selected according to the unique identification number (identification information) of the main body.

[Embodiment 2] The video camera of this embodiment is configured so that temperature compensation is applied to each of the camera body and the lens unit.

Therefore, in the present embodiment, as shown in FIG. 4, a temperature detecting element 127 for detecting the temperature of the optical system is provided in the lens unit 115 of the lens barrel.

The lens 10, the prisms 18, 1
The configurations up to 9, 20 and the mounting and detaching mechanism of the camera and the lens, the contact structure, etc., which are the attachment / detachment mechanism between the lens barrel 9 and the video camera body 1, are exactly the same as those of the first embodiment.

Since the electric circuit configuration and the operating principle are the same, the description is omitted here.

In FIG. 4, the imaging surface of the optical system fluctuates due to a rise in outside air temperature or a rise in temperature due to heat generation in the lens unit 115.

Therefore, in this embodiment, the temperature of the optical system on the lens unit 115 side is detected by the temperature detecting element 127 and transmitted to the lens microcomputer 110.

In order to calculate the shift amount of the focus position (image plane position) due to the temperature change of the optical system, the control unit 124 uses the shift amount (variation information) as the reference of the image plane per unit temperature as the temperature coefficient LTrr. ) Is stored in advance.

This amount is based on the focal length change due to the deformation of the plastic lens depending on the temperature, or the amount by which the lens interval changes due to the change of the member holding the lens and the image plane moves is stored based on data calculated or measured in advance. It is what is being done.

Accordingly, the temperature difference Δ between the predetermined reference temperature TL0 of the optical system of the lens unit 115 and the temperature detection output TL.
Assuming TL, the correction amount LPrr can be easily calculated from the following equation.

LPrr = ΔTL × LTrr (2) This correction amount LPrr is added to or subtracted from the lens cam data at a predetermined position stored in accordance with the temperature change and the focal position of the lens, so that the change in the environment due to the temperature change can be obtained. On the other hand, good temperature compensation control can be performed adaptively.

Here, in the first embodiment described above, by adding the movement amount BFTrr due to the temperature of the imaging surface on the camera body side, the temperature compensation amount Prr of the entire camera becomes Prr = BFPrr + LPrr (3), and the temperature of the entire camera Compensation can be realized.

By adding or subtracting the temperature correction amount Prr to lens cam data at a predetermined position stored in accordance with the temperature change and the focal position of the lens, the temperature correction amount Prr can be adaptively improved with respect to the environmental change due to the temperature change. Temperature compensation control can be performed.

That is, in the video camera of this embodiment,
The main body microcomputer 109 of the video camera main body 1 transmits the detected temperatures relating to the prisms 18, 19 and 20 and the temperature count BFTrr to the lens barrel 9 when the lens barrel 9 is mounted.
The lens microcomputer 110 of the lens unit 115 calculates the temperature correction amount Prr according to the above equations (2) and (3) to correct the lens cam data, and the motor control unit 12
6, the drive of the motors 112 and 114 is controlled to correct the fluctuation of the image plane position due to the temperature change.

Thus, stable photographing can be performed without being affected by a temperature change in a use environment.

In this embodiment, it is more preferable that the temperature (detection temperature) for adjustment at the time of correcting the fluctuation of the imaging plane position is a predetermined reference temperature.

It is needless to say that it is desirable to set the temperature counters BFTrr and LTrr so that the fluctuation of the image plane position can be corrected under conditions close to the environmental conditions where the video camera is frequently used.

[Embodiment 3] The video camera of this embodiment uses the temperature detection output of the camera body for temperature compensation of the lens unit.

The video camera of this embodiment is configured so that the temperature detection output of the camera body is processed by the control unit 124 of the lens unit 115 shown in FIG. 2 as described later.

The lens 10 and the prisms 18 and 1
The configurations up to 9, 20 and the mounting and detaching mechanism of the camera and the lens, the contact structure, etc., which are the attachment / detachment mechanism between the lens barrel 9 and the video camera body 1, are exactly the same as those of the first embodiment.

Since the electric circuit configuration and the operation principle are the same, the description is omitted here.

The control unit 124 of the lens unit 115
In order to calculate a shift amount of a focus position (image plane position) due to a temperature change of the optical system, a shift amount (variation information) serving as a reference of the image plane per unit temperature as a temperature coefficient LTrr, and a predetermined value of the optical system. And the reference temperature TL0 are stored in advance.

Therefore, the temperature difference for temperature compensation of the optical system can be expressed as ΔTL = TC−TL0 (4), and the temperature compensation amount Prr of the entire camera is Prr = ΔTC × BFTrr + (TC−TL0) × LTrr (5) Becomes

Here, TC is the temperature detection output of the prism by the temperature detecting element 25, BFTrr is the temperature count on the camera body side, and ΔTC is the temperature difference of the prism detected by the temperature detecting element 25.

By adding or subtracting the temperature correction amount Prr to lens cam data at a predetermined position stored in accordance with the temperature change and the focal position of the lens, the temperature correction amount Prr can be adaptively improved with respect to the environmental change due to the temperature change. Temperature compensation control can be performed.

That is, in the video camera of this embodiment,
The main body microcomputer 109 of the video camera main body 1 transmits the detected temperatures relating to the prisms 18, 19 and 20 and the temperature count BFTrr to the lens barrel 9 when the lens barrel 9 is mounted.
The lens microcomputer 110 of the lens unit 115 calculates the temperature correction amount BFPrr by the above equations (4) and (5) to correct the lens cam data, and controls the driving of the motors 111 and 113 by the motor control unit 126.
The fluctuation of the image plane position due to the temperature change is corrected.

As a result, stable photographing can be performed without being affected by temperature changes in the use environment.

In this embodiment, there is no need to provide a thermometer (temperature detecting element) in the lens unit 115 for correcting the temperature of the optical system, and a significant cost reduction can be realized.

The present embodiment is particularly effective for a combination of a lens barrel mounted as a standard lens and a video camera body.

In addition, some of the above-mentioned temperature coefficients BFTrr are stored in advance in the lens microcomputer 110 of the lens unit 115 for each unique identification number (identification information) of the camera body 116, and when the camera is mounted on the camera body 116, It is also possible to configure such that the corresponding temperature coefficient BFTrr is selected according to the unique identification number (identification information) of the main body.

[Embodiment 4] The video camera of this embodiment uses the temperature compensation of the camera body for the temperature detection output of the lens unit.

The video camera of this embodiment is configured so that the control section 124 of the lens unit 115 shown in FIG. 5 processes the temperature detection output of the optical system as described later.

The lens 10 and the prisms 18, 1
The configurations up to 9, 20 and the mounting and detaching mechanism of the camera and the lens, the contact structure, etc., which are the attachment / detachment mechanism between the lens barrel 9 and the video camera body 1, are exactly the same as those of the first embodiment.

Since the electric circuit configuration and the operation principle are the same, the description is omitted here.

The control unit 124 of the lens unit 115
In order to calculate a shift amount of a focus position (image plane position) due to a temperature change of the optical system, a shift amount (variation information) serving as a reference of the image plane per unit temperature as a temperature coefficient LTrr, The predetermined reference temperature TC0 of the prism is stored in advance.

The above shift amount is based on a change in focal length due to deformation of the plastic lens depending on the temperature, or based on data in which the amount of movement of the image plane due to a change in the lens interval due to a change in the member holding the lens is calculated or measured in advance. It is something that is memorized.

Accordingly, the temperature difference for compensating the temperature of the camera body can be expressed as ΔTC = TL−TC0 (6), and the temperature compensation amount Prr of the entire camera is expressed as Prr = (TL−TC0) × BFTrr + ΔTL × LTrr (7) Become.

Here, TL is the temperature detection output of the optical system by the temperature detection element 127, BFTrr is the temperature count on the camera body side, and ΔTL is the temperature difference detected by the temperature detection element 127 in the optical system.

By adding or subtracting the temperature correction amount Prr to lens cam data at a predetermined position stored in accordance with the temperature change and the focal position of the lens, the temperature correction amount Prr can be adaptively improved with respect to the environmental change due to the temperature change. Temperature compensation control can be performed.

That is, in the video camera of this embodiment,
The main body microcomputer 109 of the video camera main body 1 transmits a temperature count BFTrr to the lens barrel 9 when the video camera body 1 is attached to the lens barrel 9, and the lens microcomputer 110 of the lens unit 115 compensates for the temperature by the above equations (6) and (7). The amount Prr is calculated to correct the lens cam data, and the motor control unit 126 controls the driving of the motors 112 and 114 to correct the fluctuation of the image plane position due to the temperature change.

As a result, stable photographing can be performed without being affected by a temperature change in a use environment.

In the present embodiment, it is not necessary to provide a thermometer (temperature detecting element) in the camera body 116 for correcting the temperature of the camera body 116, so that a significant cost reduction can be realized.

It is particularly effective when a lens barrel mounted as a standard lens and a video camera body are combined.

In addition, some of the above-mentioned temperature coefficients BFTrr are stored in advance in the lens microcomputer 110 of the lens unit 115 for each unique identification number (identification information) of the camera body 116, and when the camera is mounted on the camera body 116. It is also possible to configure such that the corresponding temperature coefficient BFTrr is selected according to the unique identification number (identification information) of the main body.

Fifth Embodiment As shown in FIG. 6, the video camera according to the fifth embodiment is configured such that the detected temperature output of the prism of the camera body 116 is used by the lens unit 115 for temperature compensation of the camera body. It was done.

It should be noted that the lens 10, the prisms 18, 1
The configurations up to 9, 20 and the mounting and detaching mechanism of the camera and the lens, the contact structure, etc., which are the attachment / detachment mechanism between the lens barrel 9 and the video camera body 1, are exactly the same as those of the first embodiment.

Since the electric circuit configuration and the operation principle are the same, the description is omitted here.

The control unit 124 of the lens unit 115
In order to calculate a shift amount of a focus position (image plane position) due to a temperature change of the camera body 116, a temperature coefficient BFTrr is calculated.
The shift amount (variation information) serving as a reference of the imaging surface per unit temperature is stored in advance.

Therefore, similarly to the first embodiment, the predetermined reference temperature TC0 and the temperature detection output TC
The correction amount BFPrr can be easily calculated from the following equation, where ΔTC is the temperature difference from

BFPrr = ΔTC × BFTrr (8) This correction amount BFPrr is added to or subtracted from lens cam data at a certain predetermined position stored in accordance with the temperature change and the focal position of the lens, so that the environmental change due to the temperature change can be obtained. On the other hand,
Good temperature compensation control can be performed adaptively.

That is, in the video camera of this embodiment,
The main body microcomputer 109 of the video camera body 1 transmits the detected temperatures relating to the prisms 18, 19, 20 to the lens barrel 9 when the lens microcomputer 9 is attached to the lens barrel 9, and the lens microcomputer 110 of the lens unit 115 obtains the above equation (8). Correction amount B
FPrr is calculated to correct the lens cam data, and the motor control unit 126 controls the driving of the motors 112 and 114 to correct the fluctuation of the imaging plane position due to the temperature change.

Thus, stable photographing can be performed without being affected by a change in temperature under the use environment.

In the video camera of this embodiment,
The example in which the main body microcomputer 109 of the video camera main body 1 transmits the detected temperatures relating to the prisms 18, 19, and 20 to the lens barrel 9 when the main body microcomputer 109 is mounted on the lens barrel 9 has been described. The detected temperature at the time of fluctuation correction is stored in the body microcomputer 109, and the detected temperature and the current detected temperature of the prism, or the temperature difference between the detected temperature and the current detected temperature of the prism are stored in the lens barrel 9. It can also be configured to transmit.

In this embodiment, it is more desirable that the temperature (detection temperature) for adjustment at the time of correcting the fluctuation of the imaging plane position is a predetermined reference temperature.

It is needless to say that it is desirable to set the temperature coefficient BFTrr so that the fluctuation of the imaging plane position can be corrected under the condition close to the environmental condition where the video camera is frequently used.

In addition, some of the above-mentioned temperature coefficients BFTrr are stored in advance in the lens microcomputer 110 of the lens unit 115 for each unique identification number (identification information) of the camera body 116, and when the camera is mounted on the camera body 116, It is also possible to configure such that the corresponding temperature coefficient BFTrr is selected according to the unique identification number (identification information) of the main body.

[Embodiment 6] In the video camera of this embodiment, as shown in FIG. 7, the detected temperature output of the prism of the camera body 116 is compensated by the lens unit 115 for the temperature compensation of the camera body and the temperature of the optical system. It is configured to be used for compensation.

It should be noted that the lens 10, the prisms 18, 1
The configurations up to 9, 20 and the mounting and detaching mechanism of the camera and the lens, the contact structure, etc., which are the attachment / detachment mechanism between the lens barrel 9 and the video camera body 1, are exactly the same as those of the first embodiment.

Since the electric circuit configuration and the operating principle are the same, the description is omitted here.

The control unit 124 of the lens unit 115
In order to calculate a shift amount of a focus position (image plane position) due to a temperature change of the camera body 116, a temperature coefficient BFTrr is calculated.
In order to calculate a shift amount (variation information) serving as a reference of an image plane per unit temperature and a shift amount of a focus position (image plane position) due to a temperature change of the optical system, a temperature coefficient LTrr is calculated as a temperature coefficient LTrr per unit temperature. And the shift amount (variation information) serving as a reference for the imaging plane are stored in advance.

Therefore, as in the second embodiment, if the temperature difference ΔTL between the predetermined reference temperature TL0 of the optical system on the lens unit 115 side and the temperature detection output TL is used, the correction amount LPrr
Can be easily calculated from the following equation.

LPrr = ΔTL × LTrr (9) This correction amount LPrr is added to or subtracted from the lens cam data at a predetermined position stored in accordance with the temperature change and the focal position of the lens, so that the change in the environment due to the temperature change is obtained. On the other hand, good temperature compensation control can be performed adaptively.

Here, in the second embodiment described above, by adding the movement amount BFTrr according to the temperature of the image forming surface on the camera body side, the temperature compensation amount Prr of the entire camera becomes Prr = BFPrr + LPrr (10), and the temperature of the entire camera is obtained. Compensation can be realized.

By adding or subtracting this temperature correction amount Prr to lens cam data at a predetermined position stored in accordance with the temperature change and the focal position of the lens, the temperature correction amount can be adaptively improved with respect to the environmental change of the temperature change. Temperature compensation control can be performed.

That is, in the video camera of this embodiment,
The main body microcomputer 109 of the video camera body 1 transmits the detected temperatures relating to the prisms 18, 19, and 20 to the lens barrel 9 when the video camera body 1 is attached to the lens barrel 9, and the lens microcomputer 110 of the lens unit 115 uses the above equation (9). The temperature correction amount Prr is calculated by (10) to correct the lens cam data, and the motor control unit 126 controls the motor 11
2 and 114 are controlled to correct a change in the imaging plane position due to a temperature change.

As a result, stable photographing can be performed without being affected by temperature changes in the use environment.

In the video camera of this embodiment,
The example in which the main body microcomputer 109 of the video camera main body 1 transmits the detected temperatures relating to the prisms 18, 19, and 20 to the lens barrel 9 when the main body microcomputer 109 is mounted on the lens barrel 9 has been described. The detected temperature at the time of fluctuation correction is stored in the body microcomputer 109, and the detected temperature and the current detected temperature of the prism, or the temperature difference between the detected temperature and the current detected temperature of the prism are stored in the lens barrel 9. It can also be configured to transmit.

In this embodiment, it is more desirable that the temperature (detection temperature) of the adjustment at the time of correcting the fluctuation of the imaging plane position is a predetermined reference temperature.

It is needless to say that it is desirable to set the temperature counters BFTrr and LTrr so that the fluctuation of the imaging plane position can be corrected under conditions close to the environmental conditions where the video camera is frequently used.

In addition, some of the above-mentioned temperature coefficients BFTrr are stored in advance in the lens microcomputer 110 of the lens unit 115 for each unique identification number (identification information) of the camera body 116, and when the camera is mounted on the camera body 116, It is also possible to configure such that the corresponding temperature coefficient BFTrr is selected according to the unique identification number (identification information) of the main body.

Although the present invention is generally configured as described above, the present invention is not limited to the above-described video camera, but can be applied to optical equipment from which a camera unit and a lens unit can be removed. Also, the optical system of the lens barrel is the same as that of the aforementioned 4
It is not limited to a group configuration.

Further, in the embodiment, the correction of the image plane position due to the temperature change has been mainly described, but the present invention is also applicable to the case where the image plane position is corrected due to the humidity change. In this case, the camera device or / and the lens device are provided with a humidity detection element and a storage unit for humidity compensation data for calculating a shift amount of a focus position (image plane position) due to a change in humidity of the camera device. Obtain a humidity compensation amount due to humidity change by a program set according to a calculation formula according to temperature change described in the embodiment, correct control information based on the humidity compensation amount, and control motor driving. Thus, the position of the image plane associated with a change in humidity can be corrected.

It should be noted that, in the embodiment, the embodiment 1
The video camera according to claim 15 is the camera system according to claim 15, the video camera according to the second embodiment is the camera system according to claim 16, the video camera according to the third embodiment is the camera system according to claim 17, The video camera according to the fourth embodiment is the camera system according to claim 18, the video camera according to the fifth embodiment is the camera system according to claim 19, and the video camera according to the sixth embodiment is according to claim 20. Each camera system is supported.

[0156]

As described above, according to the present invention, the fluctuation information (back focus) serving as a reference of the image forming surface due to the temperature change of the optical block when the optical block is mounted on the lens device.
And / or a camera device capable of detecting the temperature for obtaining the fluctuation information by the temperature detecting means and transmitting the detected temperature to the lens device can be realized.

Further, when the camera is mounted on the camera device, the control means obtains information on the change of the imaging plane due to the temperature change of the optical block on the camera device side. Since the lens driving means is controlled by correcting the control information of the moving lens group using the fluctuation information serving as the reference of the surface, a lens device capable of correcting the image plane position due to a temperature change with high accuracy was realized. .

The temperature detecting means detects fluctuation information (back focus) serving as a reference of the imaging surface due to a temperature change of the optical block when the lens block is mounted, and / or a temperature for obtaining the fluctuation information. A camera device for transmitting to the lens device; and, when the camera device is mounted, the camera device obtains, from the camera device, fluctuation information serving as a reference of an image forming surface due to a temperature change of the optical block, and obtains the fluctuation information or / and a temperature change of the optical system. Camera device and / or lens device in a use environment by combining with a lens device that controls lens driving means by correcting control information of a moving lens group using fluctuation information serving as a reference of an imaging plane due to A camera system capable of performing stable photographing without being affected by temperature changes in the interior was realized.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a connection portion between a detachable video camera main body and a lens barrel constituting a video camera according to a first embodiment.

FIG. 2 is a block diagram illustrating an electric circuit configuration of a video camera according to the first and third embodiments.

FIG. 3 is an explanatory diagram when correcting lens cam data of the video camera of Embodiment 1 to perform lens movement control.

FIG. 4 is a block diagram illustrating an electric circuit configuration of a video camera according to a second embodiment.

FIG. 5 is a block diagram illustrating an electric circuit configuration of a video camera according to a fourth embodiment.

FIG. 6 is a block diagram illustrating an electric circuit configuration of a video camera according to a fifth embodiment.

FIG. 7 is a block diagram illustrating an electric circuit configuration of a video camera according to a sixth embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Video camera main body (camera apparatus) 9 Lens barrel (lens apparatus) 10 Focus lens group (moving lens group) 102 Variator lens group (moving lens group) 25,127 Temperature detecting element (temperature detecting means) 109 Body microcomputer (camera) Device control means) 110 Lens microcomputer (Lens device control means) 111, 113 Motor (Lens drive means) 125 Cam data storage unit (Storage means) 18, 19, 20 Color separation prism (Optical block)

Claims (25)

[Claims] 1. A camera which detachably mounts a lens device having an optical system including a moving lens group and captures a subject image formed on an image forming plane by an optical system of the lens device via an optical block. An apparatus, comprising: temperature detecting means for detecting a temperature relating to the optical block; storing fluctuation information serving as a reference of the imaging plane due to a temperature change of the optical block; and capable of communicating with the lens apparatus. Control means, wherein the control means detects temperature information of the optical block by the temperature detecting means when the lens unit is mounted on the optical block, and fluctuation information serving as a reference of the imaging surface due to a temperature change of the optical block. Is transmitted to the lens device. 2. A camera which detachably mounts a lens device having an optical system including a moving lens group and captures a subject image formed on an image forming plane by an optical system of the lens device via an optical block. An apparatus, comprising: control means for storing fluctuation information serving as a reference for the image plane in accordance with a temperature change of the optical block, and capable of communicating with the lens device. A camera device for transmitting, to the lens device, fluctuation information serving as a reference for the imaging plane due to a temperature change of the optical block when the lens is mounted. 3. The camera device according to claim 1, wherein the control unit uses a change amount per unit temperature as a reference information of the image plane according to a temperature change of the optical block in the storage unit. A camera device for transmitting to the lens device. 4. The camera device according to claim 1, wherein the control unit stores, as an amount of fluctuation per unit temperature, fluctuation information serving as a reference of an image forming plane due to a temperature change of the optical block. A camera device characterized by the above-mentioned. 5. A camera which detachably mounts a lens device having an optical system including a moving lens group and captures a subject image formed on an image plane by an optical system of the lens device via an optical block. An apparatus, comprising: temperature detection means for detecting a temperature relating to the optical block; and control means capable of communicating with the lens device, wherein the control means is configured to control the temperature of the optical block when the lens block is mounted. A camera device for transmitting temperature information detected by a detection unit to the lens device. 6. The camera device according to claim 5, wherein
The camera device, wherein the control means stores identification information unique to the camera device, and transmits the identification information to the lens device when the camera device is attached to the lens device. 7. An optical system which is detachably mounted on a camera device for capturing a subject image formed on an image forming surface via an optical block and includes a moving lens group on the image forming surface of the camera device. A lens device that forms a subject image via an optical block, wherein a lens driving unit drives a moving lens group of the optical system;
Storage means for storing control information for controlling the driving of the movable lens group; and control means capable of communicating with the camera device, wherein the control means is provided by the camera device when the camera device is mounted. Obtaining temperature information on the optical block and fluctuation information serving as a reference for the image plane with the temperature change of the optical block, and obtaining the temperature change information of the optical block and the image formation with the temperature change of the optical block. The control information of the storage unit is corrected based on fluctuation information serving as a reference of an image plane, and the lens driving unit is controlled to correct the fluctuation of the image plane position due to a temperature change. Lens device. 8. An optical system which is detachably mounted on a camera device for capturing a subject image formed on an image forming surface via an optical block, and includes a moving lens group on the image forming surface of the camera device. What is claimed is: 1. A lens device for forming a subject image via an optical block, comprising: a temperature detecting unit for detecting a temperature relating to the optical system; a lens driving unit for driving a moving lens group of the optical system; Storage means for storing control information for controlling the optical system, and control means for storing fluctuation information serving as a reference for the imaging plane due to a temperature change of the optical system and capable of communicating with the camera device. The control means obtains temperature information on the optical block from the camera device when the camera device is mounted on the optical device, and fluctuation information serving as a reference of the imaging plane due to a temperature change of the optical block. Block of Temperature change information, fluctuation information serving as a reference of the imaging surface due to a temperature change of the optical block, temperature change information of the detected temperature information of the optical system by the temperature detecting means, and a temperature change of the optical system. The control information of the storage means is corrected based on the accompanying fluctuation information serving as a reference for the imaging plane, and the lens driving means is controlled to correct the fluctuation of the imaging plane position due to a temperature change. A lens device characterized by the above-mentioned. 9. An optical system which is detachably mounted on a camera device for capturing a subject image formed on an image forming surface via an optical block, and includes a moving lens group on the image forming surface of the camera device. A lens device that forms a subject image via an optical block, wherein a lens driving unit drives a moving lens group of the optical system;
Storage means for storing control information for controlling the driving of the movable lens group; and information for storing fluctuation information serving as a reference for the image plane due to a temperature change of the optical system, and communicating with the camera device Control means for controlling the temperature information on the optical block from the camera device when the camera device is attached to the camera device, and the fluctuation information serving as a reference of the imaging plane due to the temperature change of the optical block. Obtaining temperature change information of the optical block, fluctuation information serving as a reference of the imaging surface due to a temperature change of the optical block, and a temperature of a predetermined reference temperature of the optical system and temperature information of the optical block. The control information of the storage unit is corrected and the lens driving unit is controlled based on the difference information and the fluctuation information serving as a reference of the imaging plane due to the temperature change of the optical system, and the lens driving unit is controlled by the temperature change. Correction of the image plane position A lens device, characterized in that: 10. An optical system including a movable lens group mounted on a camera device for picking up a subject image formed on an image forming surface via an optical block and including a moving lens group on the image forming surface of the camera device. What is claimed is: 1. A lens device for forming a subject image via an optical block, comprising: a temperature detecting unit for detecting a temperature relating to the optical system; a lens driving unit for driving a moving lens group of the optical system; Storage means for storing control information for controlling the optical system, and control means for storing fluctuation information serving as a reference for the imaging plane due to a temperature change of the optical system and capable of communicating with the camera device. Wherein the control means obtains, from the camera device, fluctuation information serving as a reference for the image plane associated with a temperature change of the optical block when the camera device is mounted on the camera device, and obtains the image formed by the temperature change of the optical block. Become a surface reference Motion information, temperature difference information between the detected temperature information of the optical system by the temperature detecting means and a predetermined reference temperature of the optical block, temperature change information of the detected temperature information of the optical system, and temperature of the optical system. The control information of the storage means is corrected based on the fluctuation information serving as a reference of the imaging plane due to the change, and the lens driving means is controlled to correct the fluctuation of the imaging plane position due to the temperature change. A lens device, characterized in that: 11. An optical system including a movable lens group mounted on a camera device for picking up a subject image formed on an image forming plane via an optical block and including a moving lens group on the image forming surface of the camera device. A lens device that forms a subject image via an optical block, wherein a lens driving unit drives a moving lens group of the optical system;
Storage means for storing control information for controlling the driving of the moving lens group; and storage of reference variation information of the image forming surface due to a temperature change of an optical block of the camera device; and Control means capable of communicating with each other, wherein the control means obtains temperature information on the optical block from the camera device when the camera device is mounted on the camera device, and obtains temperature change information of the optical block and a temperature of the optical block. The control information of the storage unit is corrected based on the change information serving as a reference of the image plane due to the change, and the lens driving unit is controlled to correct the change of the image plane position due to the temperature change. A lens device, characterized in that: 12. An optical system including a movable lens group mounted on a camera device for picking up a subject image formed on an image forming surface via an optical block and including a movable lens group on the image forming surface of the camera device. What is claimed is: 1. A lens device for forming a subject image via an optical block, comprising: a temperature detecting unit for detecting a temperature relating to the optical system; a lens driving unit for driving a moving lens group of the optical system; Storage means for storing control information for controlling the temperature of the optical block of the camera device, fluctuation information serving as a reference for the image plane according to a temperature change of the optical block, and a reference for the image plane according to a temperature change of the optical system. Control means for respectively storing fluctuation information to be obtained and communicating with the camera device, wherein the control means obtains temperature information on the optical block from the camera device when the camera device is mounted. Temperature change information of the optical block, fluctuation information serving as a reference of the imaging surface due to a temperature change of the optical block, temperature change information of temperature information detected by the temperature detection means of the optical system, The control information of the storage unit is corrected based on fluctuation information serving as a reference of the imaging surface due to a temperature change of the system, and the lens driving unit is controlled to change the position of the imaging surface due to the temperature change. A lens device characterized by correcting the following. 13. The lens device according to claim 11, wherein the control unit obtains a fluctuation information per unit temperature based on fluctuation information serving as a reference of the imaging plane due to a temperature change of the optical block of the camera device. A lens device characterized by being stored in (1). 14. The lens device according to claim 11, wherein the control unit sets a reference for the image plane according to a temperature change of the optical block for each unique identification information preset in the camera device. A lens device characterized by storing fluctuation information which becomes: 15. A camera device for picking up a subject image formed on an image forming surface via an optical block, and an optical system removably mounted on the camera device and including a moving lens group, the image forming surface. A lens device for forming a subject image via the optical block, the camera device comprising: a temperature detecting unit for detecting a temperature of the optical block; Control means for storing fluctuation information serving as a reference for an image plane and capable of communicating with the lens device, wherein the lens device drives a moving lens group of the optical system; Storage means for storing control information for controlling the driving of the moving lens group; and control means capable of communicating with the camera device. The control device of the camera device Temperature information of the optical block detected by the temperature detecting means at the time of mounting;
Transmitting, to the lens device, fluctuation information serving as a reference for the image plane associated with the temperature change of the optical block; the control means of the lens device transmits temperature change information of the optical block and temperature change of the optical block; The control information of the storage unit is corrected based on the fluctuation information serving as a reference of the imaging plane, and the lens driving unit is controlled to correct the fluctuation of the imaging plane position due to a temperature change. A camera system. 16. A camera device for picking up a subject image formed on an image forming surface via an optical block, and an optical system removably mounted on the camera device and including a moving lens group, the image forming surface being provided on the image forming surface. A lens device for forming a subject image via the optical block, the camera device comprising: a temperature detecting unit for detecting a temperature of the optical block; Control means for storing fluctuation information serving as a reference for an image plane and capable of communicating with the lens device, wherein the lens device detects temperature related to the optical system; and the optical system Lens driving means for driving the moving lens group, storage means for storing control information for controlling the driving of the moving lens group, and fluctuation as a reference of the imaging plane due to a temperature change of the optical system. Control means for storing information and communicating with the camera device, wherein the control device of the camera device detects temperature information of the optical block detected by the temperature detecting device when the lens device is mounted. ,
Transmitting, to the lens device, fluctuation information serving as a reference for the image plane associated with the temperature change of the optical block; the control means of the lens device transmits temperature change information of the optical block and temperature change of the optical block; Fluctuation information serving as a reference for the imaging surface, temperature change information of temperature information detected by the temperature detection means of the optical system, and fluctuation information serving as a reference for the imaging surface due to a temperature change of the optical system. A camera system that corrects the control information of the storage unit and controls the lens driving unit based on the correction of the change in the image plane position due to the temperature change. 17. A camera device for picking up a subject image formed on an image forming surface via an optical block, and an optical system removably mounted on the camera device and including a moving lens group, the image forming surface being provided on the image forming surface. A lens device for forming a subject image via the optical block, the camera device comprising: a temperature detection unit for detecting a temperature of the optical block; Control means for storing fluctuation information serving as a reference of a surface and capable of communicating with the lens device, wherein the lens device drives a moving lens group of an optical system; and the moving lens Storage means for storing control information for controlling the driving of the group, and a control means for storing fluctuation information serving as a reference of the imaging plane due to a temperature change of the optical system and capable of communicating with the camera device And a means, the control means of the camera device and the detected temperature information of the optical block by the temperature detecting means at the time of wearing with the lens apparatus,
Transmitting, to the lens device, fluctuation information serving as a reference for the image plane associated with the temperature change of the optical block; the control means of the lens device transmits temperature change information of the optical block and temperature change of the optical block; Fluctuation information serving as a reference for the imaging plane, temperature difference information between a predetermined reference temperature of the optical system and temperature information of the optical block, and a reference for the imaging plane due to a temperature change of the optical system. A camera system that corrects the control information of the storage unit based on the fluctuation information and controls the lens driving unit to correct the fluctuation of the image plane position due to a temperature change. . 18. A camera device for picking up a subject image formed on an image forming surface via an optical block, and an optical system removably mounted on the camera device and including a moving lens group. A lens device for forming a subject image through the optical block, wherein the camera device stores fluctuation information serving as a reference of the imaging plane due to a temperature change of the optical block, and A control unit communicable with the lens device, the lens device detecting a temperature related to the optical system, a lens driving unit driving a moving lens group of the optical system, Storage means for storing control information for controlling the driving of the movable lens group; and information for storing fluctuation information serving as a reference for the imaging plane due to a temperature change of the optical system, and capable of communicating with the camera device mutually Control Wherein the control means of the camera device transmits, to the lens device, fluctuation information serving as a reference of the imaging surface due to a temperature change of the optical block when the lens device is mounted on the lens device. The control unit of the apparatus includes: a reference information of the image forming surface due to a temperature change of the optical block; a temperature of the optical system detected by the temperature detecting unit; and a temperature of a predetermined reference temperature of the optical block. The control information of the storage unit is corrected based on the difference information, the temperature change information of the detected temperature information of the optical system, and the fluctuation information serving as a reference of the imaging plane due to the temperature change of the optical system. By controlling the lens driving means,
A camera system for correcting a change in the imaging plane position due to a temperature change. 19. A camera device for picking up a subject image formed on an image forming plane via an optical block, and an optical system removably mounted on the camera device and including a moving lens group. And a lens device for forming a subject image via the optical block, wherein the camera device has a temperature detecting means for detecting a temperature of the optical block, and a control capable of communicating with the lens device. Means for driving the moving lens group of the optical system, storage means for storing control information for controlling the driving of the moving lens group, and optical means for the camera apparatus. Control means for storing fluctuation information serving as a reference of the image plane in accordance with a temperature change of the block, and capable of communicating with the camera device; and When the lens unit is mounted on the optical block, the detected temperature information of the optical block by the temperature detecting unit is transmitted to the lens unit. The control unit of the lens unit transmits the temperature change information of the temperature information on the optical block and the temperature change information of the optical block. The control information of the storage unit is corrected based on fluctuation information serving as a reference of the imaging plane due to the temperature change, and the lens driving unit is controlled to correct the fluctuation of the imaging plane position due to the temperature change. A camera system characterized by: 20. A camera device for picking up an image of a subject formed on an image forming surface via an optical block, and an optical system removably mounted on the camera device and including a moving lens group. A lens device that forms a subject image via the optical block, the camera device comprising: a temperature detection unit that detects a temperature of the optical block; and a control unit that can communicate with the lens device. The lens device includes: a temperature detecting unit that detects a temperature of the optical system; a lens driving unit that drives a moving lens group of the optical system; and control information for controlling driving of the moving lens group. Storage means for storing the information, and fluctuation information serving as a reference for the imaging surface due to a temperature change of the optical block of the camera device, and fluctuation information serving as a reference for the imaging surface due to a temperature change of the optical system. Control means for storing each of them and communicating with the camera device, wherein the control means of the camera device detects temperature information of the optical block by the temperature detection means when the lens unit is attached to the lens device. Is transmitted to the lens device, and the control means of the lens device transmits temperature change information of the detected temperature information of the optical block, fluctuation information serving as a reference of the imaging plane due to the temperature change of the optical block, and The control information of the storage unit is corrected based on the temperature change information of the detected temperature information of the optical system by the temperature detection unit and the fluctuation information serving as a reference of the imaging plane due to the temperature change of the optical system. A camera system wherein a lens driving unit is controlled to correct a change in the image plane position due to a temperature change. 21. The camera system according to claim 15, 16 or 17, wherein the control means of the camera device obtains fluctuation information serving as a reference of the imaging plane due to a temperature change of the optical block per unit temperature. A camera device for transmitting a variation amount to the lens device. 22. The camera system according to claim 15, wherein the control means of the camera device obtains fluctuation information per unit temperature based on fluctuation information serving as a reference of an imaging plane due to a temperature change of the optical block. A camera device, characterized in that the camera device stores the amount. 23. The camera system according to claim 19, wherein the control unit of the camera device stores detected temperature information of the optical block at the time of correcting a change in the imaging plane position due to a temperature change, A camera system for transmitting the detected temperature information and the current detected temperature information of the optical block to the lens device. 24. The camera system according to claim 19, wherein the control unit of the camera device stores detected temperature information of the optical block at the time of correcting a change in the imaging plane position due to a temperature change, A camera system for transmitting a temperature difference between the detected temperature information and the current detected temperature information of the optical block to the lens device. 25. The camera system according to claim 19, wherein the control unit of the camera device stores identification information unique to the camera device, and stores the identification information when the camera device is mounted on the lens device. Wherein the control device of the lens device stores, for each piece of identification information unique to the camera device, fluctuation information serving as a reference of the imaging plane due to a temperature change of the optical block. system.