JP2009210711A - Imaging device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an imaging device easily determining a focusing area of a photographing screen, even when a diaphragm value of a photographing lens is changed. <P>SOLUTION: The imaging device includes: a detecting means for detecting defocusing amounts in the plurality of areas within the screen; a display means for displaying focusing states in the plurality of focusing areas; and a control means for changing a range of the defocusing amount determined as focus-on in each area in response to the diaphragm value of the photographing lens. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an imaging apparatus capable of detecting a focus in a plurality of areas in a screen.

  Conventionally, the defocus amount (deviation amount from the focus state) in multiple areas of the shooting screen is detected using the light flux that has passed through the shooting lens, and the areas within the preset defocus amount tolerance range are matched. A camera (imaging device) that determines to be in focus is known.

  This camera is provided with so-called superimpose display means for displaying a region determined to be in focus with a captured image so as to facilitate focusing by a photographer.

In addition, the depth of field, which is the depth at which focus deviation is allowed in the subject area, changes when the aperture value (F value) of the photographing lens is changed. Using this fact, the photographer can focus on the intended portion of the photographing screen with high accuracy.
Japanese Patent Laid-Open No. 2002-23241

  In a conventional camera, the defocus amount Δ0 that is allowed when determining in-focus is fixed for each photographing lens, and does not correspond to the depth of field at the time of photographing. For this reason, when the photographer changes the aperture value of the photographing lens, skill is required to predict which region of the subject on the photographing screen is within the depth of field.

  In addition, the conventional camera has a function of displaying a preview of the shooting screen. However, when the aperture value is large, the screen becomes extremely dark, and it is very difficult to check the in-focus state.

  In Patent Document 1, a value related to the size of the circle of confusion on the imaging surface is obtained from the aperture value and defocus amount of the photographing lens, and the value related to the size of the circle of confusion is displayed as a blur amount. It is impossible to know the in-focus state of a plurality of areas.

  An object of the present invention is to provide an imaging apparatus that can easily determine an area (in-focus area) within the depth of field of a shooting screen even when the aperture value of the shooting lens is changed. And

  An imaging apparatus according to the present invention includes a detection unit that detects defocus amounts in a plurality of areas in a screen, a display unit that displays a focus state of the plurality of areas, and a defocus amount that is determined to be in focus in each region. And a control means for changing the range according to the aperture value of the photographing lens.

  According to the present invention, in a camera capable of focus detection in a plurality of areas in the screen, an area within the depth of field of the shooting screen can be easily obtained by performing focus determination according to the aperture value of the shooting lens. Can be determined.

  Hereinafter, embodiments of the present invention will be described in detail.

  FIG. 1 is a schematic diagram of a camera (image pickup apparatus) that is Embodiment 1 of the present invention. The camera 1 is provided with a mount 3 on which a photographic lens (interchangeable lens) 2 can be mounted and an aperture value dial 4 that can change the aperture value (F value) of the photographic lens.

  Inside the camera 1, there are a main mirror 5 that can be retracted at the time of photographing, a sub mirror 6 that reflects a part of the light transmitted through the main mirror 5 and guides it to the focus detection unit, and an image sensor 7 that includes a plurality of pixels. And a camera-side CPU (control means) 8 formed on the circuit board.

  A finder optical system 15 as an observation system of the camera 1 includes a focusing screen 9, a penta roof prism 10, an eyepiece lens 11, a light emitting unit 12 composed of a superimpose LED (light emitting element) and an LED driving circuit, and a superimposing lens. 13 and a reflector 14 are provided.

  A plurality of reflecting surfaces are formed on the reflecting plate 14, and light from the superimpose LED reflected by the reflecting surfaces is guided to an observer through the penta roof prism 10 and the eyepiece 11. When the superimpose LED emits light according to the focus state of the plurality of regions, the focus state of the plurality of regions is observed through the eyepiece.

  The focusing screen 9 and the reflecting plate 14 are disposed in the vicinity of the focal plane of the photographic lens 2.

  The focus detection unit of the camera 1 includes a focus detection element of a phase difference detection system that includes an imaging optical system 16, a plurality of light receiving sensors corresponding to a plurality of areas (ranging areas) of a shooting screen, and an automatic focus detection circuit 17 is arranged.

  The photographing lens 2 includes a photographing optical system 18, a diaphragm 19, and a lens side CPU 20.

  FIG. 2 is an explanatory diagram of a state (front pin) where the subject P1 to be photographed is closer to the camera than the focused subject P0.

  P0 is the subject in focus, P1 is the subject closer to the camera than the subject P0, P0 ′ is the imaging position of the subject P0 (position on the imaging surface), P1 ′ is the imaging position of the subject P1, and L0 is the subject A subject distance of P0, L1 is a subject distance of the subject P1, L0 ′ is a video distance corresponding to the subject distance L0, and L1 ′ is a video distance corresponding to the subject distance L1. Further, δ1 is a circle of confusion on the imaging surface (image formation position of the subject P0), and Δ1 is a difference between the image distance L1 ′ and the image distance L0 ′, which is a deviation amount between the image formation position of the subject P1 and the image pickup surface. is there. D is the aperture diameter.

  The defocus amount in the present invention is a value related to a deviation from perfect focusing, for example, a confusion circle diameter, a deviation amount between an imaging position and an imaging surface, a value related to an image interval in a phase difference detection method, and a contrast. A value related to the contrast value in the detection method. However, in the following description, the shift amount between the imaging position and the imaging surface is referred to as a defocus amount.

  With respect to each parameter shown in FIG.

  FIG. 3 is an explanatory diagram of a state (rear pin) in which the subject P2 to be photographed is at a position farther than the focused subject P0.

  P2 is a subject far from the subject P0 (opposite to the camera side), P2 ′ is an imaging position of P2, L2 is a subject distance of the subject P2, L2 ′ is a video distance with respect to the subject distance L2, and δ2 is imaging A circle of confusion, Δ2, on the surface (imaging position of the subject P0) is a difference between the image distance L0 ′ and the image distance L2 ′, which is a deviation amount of the image formation position of the subject P2 from the imaging surface. D is the aperture diameter.

  With respect to each parameter shown in FIG.

  If the circle of confusion in the state of the rear pin is expressed as a negative value, Equation (2) is expressed by Equation (3).

  Since the sign of the defocus amount obtained from the focus detection element 17 using the phase difference detection method is different between the front pin and the rear pin, the defocus amount at the front pin is a positive value. Then, the circle of confusion diameter δ when the defocus amount is Δ is expressed by Equation (4).

  Here, when L0 ′ >> | Δ |, F which is an effective F value of the photographing lens is expressed by Expression (5).

  Therefore, Equation (6) can be obtained as an approximate expression of Equation (4).

  Here, when the range of the circle of confusion diameter δ0 allowed on the image plane of the camera 1 is set to −δ0 ≦ δ ≦ δ0, the range of the defocus amount (allowable defocus amount) Δ0 corresponding thereto is expressed by Equation (7). It is expressed as

-△ 0 ≦ △ ≦ △ 0 (7)
Here, Δ0 is expressed by Formula (8) or Formula (9) from Formula (4).

  When the camera-side CPU 8 of the camera 1 can obtain information on the video distance L0 'and the aperture diameter D as information on the photographing lens 2, it calculates Δ0 using Equation (8). If information about the video distance L0 'and the aperture diameter D cannot be obtained, Δ0 is calculated using Equation (9).

  Next, by comparing the defocus amount Δ in each distance measurement area detected by the focus detection unit with the above Δ0, it is determined whether or not the formula (7) is established.

  And superimpose LED of the light emission part 12 is light-emitted so that it may respond | correspond to the ranging area where Numerical formula (7) is satisfied. Light from the superimpose LED is reflected by the reflecting plate 14 and guided to the eyes of the observer (photographer) through the penta roof prism 10 and the eyepiece 11.

  Thereby, the observer can easily discriminate | determine the area | region which exists in the depth of field from several focus detection area | regions (ranging area | region) of an imaging | photography screen.

  Note that the allowable range of the circle of confusion diameter δ0 and the range of the defocus amount Δ0 corresponding to the range vary depending on the size and the number of pixels of the imaging element of the camera and the assumed viewing mode.

  FIG. 4 is a block diagram showing the control system of the camera 1, and shows the relationship among the camera side CPU 8, the aperture value dial 4, the focus detection element 17, the lens side CPU 20, and the light emitting unit 12.

  The camera side CPU 8 controls the aperture value of the photographing lens 2 by transmitting a signal to the lens side CPU 20 based on the aperture value set by the aperture value dial 4.

  Further, the camera side CPU 8 calculates the allowable defocus amount Δ0 based on the aperture value set by the aperture value dial 4 and the preset allowable confusion circle diameter δ0.

  Then, the camera-side CPU 8 receives the defocus amount Δ in each distance measurement area from the automatic focus detection circuit of the focus detection element 17 and emits a superimpose LED corresponding to the distance measurement area in which Expression (7) is satisfied. In addition, a signal is transmitted to the LED drive circuit of the light emitting unit 12.

  When the aperture value set by the aperture value dial 4 is changed, the camera-side CPU (control means) 8 is based on the aperture value after the change and the preset allowable confusion circle diameter δ0. The allowable defocus amount Δ0 is reset. As a result, since the allowable defocus amount Δ0 is changed according to the aperture value of the photographic lens 2, even if the aperture value of the photographic lens 2 is changed, the subject in any region of the photographic screen is captured. Whether it is within the depth of field can be easily determined.

  5 and 6 show screens in which the finder optical system 15 displays the captured image and a plurality of distance measurement areas in an overlapping manner.

  FIG. 5 shows a case where the aperture value is set to the open aperture value (minimum value). When the aperture value is small, the depth of field becomes shallow, so the focusing range is relatively small.

  FIG. 6 shows a case where the aperture value is set to a large value. When the aperture value is large, the depth of field becomes deep, so the focusing range is relatively large.

  In this way, the distance measurement area within the range of the allowable defocus amount Δ0 that is changed according to the aperture value of the photographing lens 2 (formula (7)) is displayed so as to be superimposed on the photographed image acquired by the image sensor. Therefore, even when the aperture value of the photographic lens 2 is changed, the in-focus range can be easily determined.

  FIG. 7 is a flowchart showing the operation of focusing display of the camera. In step 101, a permissible circle of confusion δ0 set in advance based on the size of the image sensor of the camera, the number of pixels, an assumed viewing mode, and the like are input. In step 102, the set value F of the aperture 19 set by the aperture value dial 4 is input. In step 103, the allowable defocus amount Δ0 is calculated from the allowable confusion circle diameter δ0 and the aperture value. In step 104, defocus amounts Δ [1] to Δ [9] in each distance measurement area are detected. In step 105, the superimpose LED corresponding to the distance measurement area where Equation (7) holds is turned on.

  According to the present embodiment, since the distance measurement area within the range of the allowable defocus amount Δ0 that is changed according to the aperture value of the photographic lens 2 is displayed over the captured image, the aperture value of the photographic lens 2 is set. Even when it is changed, the in-focus area in the shooting screen can be easily determined.

  In this embodiment, the number of ranging areas is set to 9, but the number of ranging areas may be further increased.

  FIG. 8 is a schematic diagram of a camera 101 that is Embodiment 2 of the present invention. Hereinafter, for the camera 101 of the present embodiment, the same members as those used in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  In the present embodiment, the range of the allowable defocus amount Δ0 represented by Expression (7) and Expression (8) or Expression (7) and Expression (9) is set as the first range.

  Further, the allowable defocus amount Δ0 ′ is defined by Expression (10) or Expression (11) using the aperture diameter D0 or the effective F value F0 when the aperture 19 of the photographing lens 2 is set to the full open.

In this embodiment, the range of the allowable defocus amount Δ0 ′ represented by Expression 12 using Δ0 ′ is set as the second range.
-△ 0 '≦ △ ≦ △ 0' (12)
The second embodiment is characterized by a light emitting unit 21 including a superimpose LED and an LED drive circuit, and two colors of LEDs are arranged for each distance measuring area. The first color (for example, red) LED is caused to emit light for the distance measurement area where the defocus amount Δ is within the second range, and the second color (for example, green color) is used for the distance measurement area that falls within only the first range. ) LED is emitted.

  FIGS. 9 and 10 show screens in which the finder optical system 15 displays a captured image and a plurality of distance measurement areas in an overlapping manner.

  FIG. 9 shows a case where the aperture value is set to the open aperture value (minimum value). When the aperture value is small, the depth of field becomes shallow, so the focusing range is relatively small.

  The ranging area determined to be in focus can be easily determined by the red or green superimpose LED emitting light according to the defocus amount.

  FIG. 10 shows a case where the aperture value is set to a large value. When the aperture value is large, the depth of field becomes deep, so the focusing range is relatively large. A distance measurement area where the defocus amount Δ is within the second range is displayed in the first color (for example, red), and a distance measurement area included only in the first range is displayed in the second color (for example, green). Thus, the photographer can not only easily determine the in-focus area on the shooting screen, but also can easily grasp an area with a small defocus amount in the in-focus area.

  FIG. 11 is a block diagram showing a control system of the camera 101, and shows the relationship among the camera side CPU 8, the aperture value dial 4, the focus detection element 17, the lens side CPU 20, and the light emitting unit 21.

  The camera side CPU 8 controls the aperture value of the photographing lens 2 by transmitting a signal to the lens side CPU 20 based on the aperture value set by the aperture value dial 4.

  Further, the camera-side CPU 8 determines the allowable defocus amount Δ0 and the allowable defocus amount Δ0 ′ based on the aperture value set by the aperture value dial 4 and the open aperture value, and the preset allowable confusion circle diameter δ0. Is calculated.

  Then, the camera-side CPU 8 receives the defocus amount Δ in each distance measurement area from the automatic focus detection circuit of the focus detection element 17, and superimposes corresponding to the distance measurement area where Expressions (7) and (12) hold. A signal is transmitted to the LED drive circuit of the light emitting unit 21 so that the LED emits light.

  When the aperture value set by the aperture value dial 4 is changed, the camera side CPU 8 determines the allowable defocus amount Δ based on the changed aperture value and the preset allowable confusion circle diameter δ0. 0 is reset. As a result, since the allowable defocus amount Δ0 is changed according to the aperture value of the photographic lens 2, even if the aperture value of the photographic lens 2 is changed, the subject in any region of the photographic screen is captured. Whether it is within the depth of field can be easily determined.

  FIG. 12 is a flowchart showing the operation of focusing display of the camera.

  In step 201, a permissible circle of confusion δ0 set in advance based on the size of the image sensor of the camera, the number of pixels, an expected viewing mode, and the like are input. In step 202, the set value F of the aperture 19 set by the aperture value dial 4 is input. In step 203, the first defocus amount Δ0 is calculated from the allowable confusion circle diameter δ0 and the aperture value F. In step 204, a second defocus amount Δ0 'is calculated. In step 205, defocus amounts Δ [1] to Δ [9] in each distance measurement area are detected. In step 206, it is determined whether the defocus amounts Δ [1] to Δ [9] in each distance measurement area are within the second range, and the first color corresponding to each distance measurement area is determined based on the determination result. LEDR which is a superimpose LED (for example, red) is turned on. In step 207, it is determined whether or not the defocus amounts Δ [1] to Δ [9] in each distance measurement area are within the first range and outside the second range. Further, based on the determination result, the LEDG, which is the second color (for example, green) superimpose LED corresponding to each distance measurement area, is turned on. As a result, an area with a small defocus amount that falls within the second range is displayed in red, and an area that does not fall within the second range but falls within the first range is displayed in green. To do.

  According to the present embodiment, the distance measurement area within the first range that is changed according to the aperture value of the photographic lens 2 and the distance measurement area within the second range that is determined according to the open aperture value. However, two types of red and green are displayed over the shooting screen, so that even when the aperture value of the shooting lens 2 is changed, the focusing area on the shooting screen can be easily determined and It is possible to easily grasp a region with a small defocus amount in the focus region.

  In the present embodiment, the number of ranging areas is nine, but the number of ranging areas may be further increased.

  In the present embodiment, the defocus amount Δ0 ′ is associated with the open aperture value of the photographing lens 2. However, the defocus amount Δ0 ′ may not necessarily correspond to the open aperture value as long as the aperture value is relatively small.

  Then, when the aperture value set in the photographic lens 2 is changed and the first range changes, the second range may be changed accordingly. For example, when the first range is expanded, the second range can be expanded accordingly.

  In this embodiment, two colors of LEDs are used, and the display of the region where the defocus amount Δ is in the first range and the region in the second range is different. The display of each region may be different using a light emission pattern such as brightness.

  Furthermore, in this embodiment, the focus range is displayed in two stages by the defocus amount Δ0 and the defocus amount Δ0 ′, but the present invention is not limited to this, and the third defocus amount Δ0 ″, etc. May be used to display the in-focus range in multiple stages.

  FIG. 13 is a schematic diagram of a camera 301 that is Embodiment 3 of the present invention. The third embodiment is obtained by changing a part of the configuration of the finder optical system 15 of the second embodiment, and is characterized in that a dichroic mirror 22 is used instead of the reflector 14 in the second embodiment.

  The light emitted from the superimposing LED of the light emitting unit 24 is reflected by the dichroic mirror 22 so that the region in the first range and the region in the second range are displayed.

  In the third embodiment, a part of the configuration of the finder optical system 15 of the second embodiment is changed, but in the finder optical system 15 of the first embodiment, a dichroic mirror 22 is used instead of using the reflector 14. May be.

  FIG. 14 is a schematic diagram of a camera 401 that is Embodiment 4 of the present invention. In the fourth embodiment, the configurations of the main mirror 5 and the finder optical system 15 in the second embodiment are changed. Hereinafter, for the camera 401 of the present embodiment, the same members as those used in Embodiment 1 are denoted by the same reference numerals, and description thereof is omitted.

  The main mirror 29 of the fourth embodiment reflects a part of light and guides it to the focus detection unit.

  In addition, the camera 401 according to the fourth embodiment includes a finder optical system 28 that displays an image read by the image sensor 7 on the liquid crystal display element (LCD) 26 and observes it with the eyepiece 27. The liquid crystal display element 26 performs the first display (for example, thick frame display) on the distance measurement area where the defocus amount Δ falls within both the first range and the second range, and is within the first range. In addition, a second display (for example, a narrow frame display) is performed on a distance measurement area that is outside the second range. The first range and the second range are set in the same manner as in the second embodiment.

  FIG. 15 is a block diagram showing a control system of the camera 401, and shows the relationship among the camera side CPU 8, the aperture value dial 4, the focus detection element 17, the lens side CPU 20 and the LCD 26.

  The camera side CPU 8 controls the aperture value of the photographing lens 2 by transmitting a signal to the lens side CPU 20 based on the aperture value set by the aperture value dial 4.

  Further, the camera-side CPU 8 determines the allowable defocus amount Δ0 and the allowable defocus amount Δ0 ′ based on the aperture value set by the aperture value dial 4 and the open aperture value, and the preset allowable confusion circle diameter δ0. Is calculated.

  Then, the camera-side CPU 8 receives the defocus amount Δ in each distance measurement area from the automatic focus detection circuit of the focus detection element 17, and the distance measurement area corresponding to the distance measurement area where Expressions (7) and (12) hold. A signal is transmitted to the LCD so that is displayed.

  When the aperture value set by the aperture value dial 4 is changed, the camera side CPU 8 determines the allowable defocus amount Δ based on the changed aperture value and the preset allowable confusion circle diameter δ0. 0 is reset. As a result, since the allowable defocus amount Δ0 is changed according to the aperture value of the photographic lens 2, even if the aperture value of the photographic lens 2 is changed, the subject in any region of the photographic screen is captured. Whether it is within the depth of field can be easily determined.

  FIGS. 16 and 17 are screens in which a shooting screen and a distance measurement area are displayed in the viewfinder in the camera of the fourth embodiment.

  FIG. 16 shows a case where the aperture value is set to the open aperture value (minimum value). When the aperture value is small, the depth of field becomes shallow, so the focusing range is relatively small. The ranging area determined to be in focus can be easily determined by performing the first display (for example, thick frame display) or the second display (for example, thin frame display) according to the defocus amount. it can.

  FIG. 17 shows a case where the aperture value is set to a large value. When the aperture value is large, the depth of field becomes deep, so the focusing range is relatively large. A distance measurement area included in both the first range and the second range is displayed in the first display (for example, thick frame display), and is within the first range and is outside the second range. A second display (for example, a narrow frame display) is performed in the distance area. Thereby, the photographer can not only easily determine the focus area on the shooting screen, but also can easily grasp the area with a small defocus amount in the focus area.

  FIG. 18 is a flowchart showing the focus display operation of the camera 401.

  In step 301, a permissible circle of confusion δ0 set in advance based on the size of the image sensor of the camera, the number of pixels, an assumed viewing mode, and the like are input. In step 302, the set value F of the aperture 19 set by the aperture value dial 4 is input. In step 303, the first defocus amount Δ0 is calculated from the allowable confusion circle diameter δ0 and the aperture value F. In step 304, a second defocus amount Δ0 'is calculated. In step 305, defocus amounts Δ [1] to Δ [9] in each distance measurement area are detected. In step 306, it is determined whether the defocus amounts Δ [1] to Δ [9] in each ranging area are within the second range, and the first corresponding to each ranging area is determined based on the determination result. Is displayed (for example, thick frame display). In step 307, it is determined whether or not the defocus amounts Δ [1] to Δ [9] in each distance measurement area are within the first range and outside the second range. Further, based on the determination result, second display (for example, narrow frame display) corresponding to each distance measurement area is performed. As a result, an area with a small defocus amount that falls within the second range is displayed with a thick frame, and an area that does not fall within the second range but falls within the first range is thinly framed. Is displayed.

  According to the present embodiment, the distance measurement area within the first range that is changed according to the aperture value of the photographic lens 2 and the distance measurement area within the second range that is determined according to the open aperture value. However, since the two types of the thick frame and the thin frame are displayed so as to overlap the captured image, even when the aperture value of the photographic lens 2 is changed, the in-focus area on the photographic screen can be easily determined. In the in-focus area, an area with a small defocus amount can be easily grasped.

  In the present embodiment, the number of ranging areas is nine, but the number of ranging areas may be further increased.

  Further, in this embodiment, the first display and the second display are the thick frame display and the thin frame display, but different display methods may be used, and various display methods such as color, shape, brightness, and blinking may be used. Can be applied.

  Further, in this embodiment, the image displayed on the liquid crystal display element 26 is observed through the eyepiece lens 27. However, the liquid crystal display element 26 is mounted on the back surface of the camera 1 (with the mount 3 with respect to the image sensor 7). May be arranged on the opposite side) so that the observer directly observes the liquid crystal display element.

  Furthermore, the display element is not limited to the liquid crystal display element, and an organic EL or other display element can be used.

  The preferred embodiments of the present invention have been described above, but the present invention is not limited to these embodiments, and various modifications and changes can be made within the scope of the gist.

1 is a schematic diagram of a camera according to a first embodiment of the present invention. Illustration of the state of the front pin Illustration of the state of the rear pin 1 is a block diagram showing a control system of a camera according to a first embodiment of the present invention. FIG. 6 is a diagram of a screen in which a photographed image and a plurality of distance measuring areas are superimposed and displayed by the finder optical system according to the first embodiment of the present invention (when the aperture value is small). FIG. 6 is a diagram of a screen in which a photographed image and a plurality of distance measuring areas are superimposed and displayed by the finder optical system according to the first embodiment of the present invention (when the aperture value is large). The flowchart which showed the operation | movement of the focus display of the camera of Example 1 of this invention. Schematic of the camera of Example 2 of the present invention FIG. 6 is a diagram of a screen in which a photographed image and a plurality of distance measuring areas are superimposed and displayed by the finder optical system according to the second embodiment of the present invention (when the aperture value is small). FIG. 7 is a diagram of a screen in which a photographed image and a plurality of distance measuring areas are superimposed and displayed by the finder optical system according to the second embodiment of the present invention (when the aperture value is large). FIG. 3 is a block diagram illustrating a control system of a camera according to a second embodiment of the present invention. The flowchart which showed the operation | movement of the focus display of the camera of Example 2 of this invention. Schematic of the camera of Example 3 of the present invention Schematic of the camera of Example 4 of the present invention FIG. 6 is a block diagram illustrating a control system of a camera according to a fourth embodiment of the present invention. FIG. 10 is a diagram of a screen in which a photographed image and a plurality of distance measuring areas are superimposed and displayed by the finder optical system according to the fourth embodiment of the present invention (when the aperture value is small). FIG. 7 is a diagram of a screen in which a photographed image and a plurality of distance measuring areas are superimposed and displayed by the finder optical system according to Embodiment 4 of the present invention (when the aperture value is large). The flowchart which showed the operation | movement of the focus display of the camera of Example 4 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 101, 301, 401 Camera 2 Shooting lens 3 Mount 4 Aperture value dial 5, 29 Main mirror 6 Sub mirror 7 Image sensor 8 Camera side CPU
DESCRIPTION OF SYMBOLS 9 Focusing plate 10 Penta roof prism 11, 27 Eyepiece 12, 21, 25 Light emission part 13, 24 Superimposing lens 14 Reflector 15, 28 Viewfinder optical system 16 Imaging optical system 17 Focus detection element 18 Shooting optical system 19 Aperture 20 Lens side CPU
21 Superimpose LED
22 Dichroic mirror 26 Liquid crystal display element

Claims (8)

  Detection means for detecting defocus amounts in a plurality of areas in the screen, display means for displaying in-focus states of the plurality of areas, and a range of defocus amounts determined to be in focus in each area An imaging apparatus comprising control means for changing according to an aperture value. The range of defocus amount determined to be in focus at the aperture value set for the taking lens is the first range, and it is determined to be in focus at a predetermined aperture value smaller than the aperture value set for the taking lens. When the range of the defocus amount to be performed is the second range,
The imaging apparatus according to claim 1, wherein the display unit performs different display for an area within the second range and an area outside the second range and within the first range. .   The photographing apparatus according to claim 2, wherein the predetermined aperture value is an open aperture value of the photographing lens.   The photographing apparatus according to claim 2, wherein the predetermined aperture value is changed according to an aperture value set for the photographing lens.   The display means includes: a light emitting element; and a reflecting plate arranged so that a reflecting surface that reflects light from the light emitting element to guide the eyepiece lens corresponds to the plurality of regions. The in-focus state of the plurality of regions is observed through the eyepiece lens by emitting light according to the in-focus state of the plurality of regions. The imaging device described.   The imaging apparatus according to claim 5, wherein the reflecting plate is disposed on a focal plane of the photographing lens.   5. The imaging according to claim 1, wherein the display unit includes a display element that displays an in-focus state of the plurality of regions and an image acquired by the imaging element in an overlapping manner. apparatus.   The image pickup apparatus according to claim 7, wherein an image displayed on the display element is observed through an eyepiece lens.

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