JPH06189181A - Intermediate adapter provided with vibration - Google Patents

Abstract

PURPOSE:To miniaturize a device for preventing picture blurring due to the hand-held photographing of a video camera and to make the device light in weight by an intermediate adapter. CONSTITUTION:The intermediate adapter 3 is mounted between an exchangeable image pickup optical system 1 and the main body 2 of a camera provided with an imaging device and a variable apex prism (VAP) 5 is provided between a lens group 4 provided with convex power present at a front side and the lens group 6 provided with concave power present at a rear side. Further, by the information of a vibration detection sensor 10 provided inside the adapter 3, optimum driving control is transmitted through a control circuit 9 to a VAP driving circuit 11 and the VAP 5 is driven.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intermediate adapter having a vibration isolation device for an image pickup device such as a video camera.

[0002]

2. Description of the Related Art In recent years, video cameras have been remarkably popularized as they have become smaller and lighter and have higher magnification and more functions. In the above-mentioned video camera, most of the functions related to shooting are automated, so that the number of shooting failures due to the functions of the video camera itself is extremely small.
By the way, it is not an exaggeration to say that the screen is always blurred in the handheld posture that is most frequently used in video cameras, and in recent years, uncomfortable situations such as video sickness have become a problem along with image quality deterioration due to such screen blur. .

As a means for solving the above-mentioned screen blur, there is a conventional image stabilizing device using a gyro mechanism.
In this device, a lens barrel system is moved by a gyro mechanism to obtain a stable image, and this device has a problem that the camera body is increased in size and weight is increased. Therefore, in recent years, the optical axis of the photographing optical system is decentered according to the shake of the camera so that the optical image is positioned on a predetermined image forming surface of the image sensor. An image pickup apparatus having an image blur correction means has been developed.

The above-mentioned variable apex angle prism is constructed such that a liquid having a constant refractive index is enclosed in an accordion-shaped container having a bellows sandwiched between two transparent plates. Then, the photographic optical axis is decentered by controlling the tilt of the transparent plate on the subject side by a drive mechanism including a magnetic circuit. As described above, in the above-described device, since the optical axis is decentered from the variable apex angle prism, it is not necessary to move the lens barrel system, and it is possible to minimize the increase in size and weight of the camera body, It is possible to obtain a good image in which image blur is effectively prevented.

[0005]

However, in the conventional example in which the image blur correction means by the optical axis eccentric means such as the variable apex angle prism described above is arranged on the front side or the middle of the image pickup lens and integrally configured, There was such a drawback. (1) The entire imaging lens is large and heavy. (2) On the contrary, when the anti-vibration function is not used, it is heavy and inconvenient. (3) It is irrational because all the lenses must be mounted to support several types of lenses.

It is an object of the present invention to eliminate the above-mentioned drawbacks of the prior art and to provide an intermediate adapter having a vibration proof device for use in an image pickup device which is compact and lightweight and is compatible with various types of lenses. And

[0007]

In order to achieve the above-mentioned object, the present invention provides an intermediate adapter which is attachable / detachable in the middle between a replaceable image pickup optical system and a camera having an image pickup element, and which has a concave front portion. It has a lens group having a power, a lens group having a convex power on the rear side, and an anti-vibration device provided in the middle of the concave-convex lens group.

[0008]

In the intermediate adapter having the above construction, the vibration isolator is provided in the portion of the lens system where the diameter of the light flux is the smallest, so that the adapter can be made smaller and lighter.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In the figure, reference numeral 1 denotes a replaceable image pickup optical system, which incorporates a lens microcomputer 7 having lens information. Reference numeral 2 denotes a camera body including an image pickup device (not shown), a camera microcomputer, and the like. Reference numeral 3 denotes an intermediate adapter which is attachable / detachable between the image pickup optical system 1 and the camera body 2 by a mount, and has a lens group 4 having a concave power on the optical axis in order from the front side, a variable vertical angle prism (VAP) 5, and a convex lens. A lens group 6 having a power of, and an adapter microcomputer 8 connected to the lens microcomputer 7 in the imaging optical system 1 when mounted, a control circuit 9 connected to the microcomputer 8 and a control circuit 9 connected to the microcomputer 8 respectively. The shake detection sensor 10 and the VAP drive circuit 11 are provided.

In the present embodiment having the above-mentioned structure, when the intermediate adapter 3 is mounted between the image pickup optical system 1 and the camera body 2, the lens microcomputer 7 causes the adapter microcomputer 8 to provide the lens necessary for the image stabilization control such as the focal length. The unique information is transmitted, and the information signal is transmitted to the control circuit 9. Further, optimum drive control is transmitted to the VAP drive circuit 11 based on the information of the shake detection sensor 10 to drive the VAP 5 by a drive system (not shown).

Next, the operation relationship after the image pickup optical system 1 is attached will be described with reference to the flowchart of FIG. First, in step 1, the intermediate adapter 2 is attached to the camera body 3, and then the imaging optical system 1 is attached to the adapter 2. Then, in step 2, the lens microcomputer 7 confirms that the adapter 2 is attached, and then in step 3
Then, the lens microcomputer 7 sends the lens information to the adapter microcomputer 8, and the adapter microcomputer 8 confirms the reception and transmits it to the lens microcomputer 7. Then, in step 4, the lens microcomputer 7 sends the information with the adapter to the camera microcomputer (not shown), In step 5, VAP5 can be turned on on the camera side. Note that, instead of the VAP 5 of this embodiment, a similar effect can be achieved by providing a shift type optical system and incorporating a mechanism for shift driving in the direction perpendicular to the optical axis.

[0012]

As described above, the present invention has a lens group having a concave power on the front side and a lens group having a convex power on the rear side, and a vibration proof is provided in the middle of the concave-convex lens group. By attaching and removing the intermediate adapter equipped with the device with a mount in the middle of the replaceable imaging optical system and the camera with the image sensor, the vibration proof device can be made smaller and lighter, and can be used for various types of lenses. There is an effect that can be used according to.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an intermediate adapter having a vibration isolation device according to an exemplary embodiment of the present invention when a camera is attached.

FIG. 2 is a flowchart explaining the operation.

[Explanation of symbols]

1 ... Imaging optical system 2 ... Camera body 3 ... Intermediate adapter 4 ... Lens group with concave power 5 ... Variable vertical angle prism (VAP), 6 ... Lens with convex power Group, 7 ... Lens microcomputer, 8 ... Adapter microcomputer,
9 ... Control circuit, 10 ... Shake detection sensor, 11 ... V
AP drive circuit.

Claims (1)

[Claims] 1. An intermediate adapter, which is mountable and removable between a replaceable imaging optical system and a camera having an image sensor, has a lens group having concave power on the front side and a convex power on the rear side. An intermediate adapter having a vibration isolator, comprising a lens group having the same, and a vibration isolator provided in the middle of the concave and convex lens group.