JPH06273665A - Automatic focusing camera - Google Patents

Abstract

PURPOSE:To provide the automatic focusing camera of a multi-AF area which can execute high-speed and consecutive photographing. CONSTITUTION:In the case of the consecutive photographing by a consecutive photographing means 908, defocus quantity is calculated by a focus detection arithmetic means 906 based on the output of a photoelectric conversion means corresponding to a focus detection area which is previously decided among the plural focus detection areas 903a, 903b,... by a control means 909. In the case that the photographing is not the consecutive photographing, the defocus quantity is calculated by the arithmetic means 906 based on the outputs of the photoelectric conversion means 904a, 904b,... corresponding to all of the focus detection areas 903a, 903b,....

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic focusing camera, and more particularly to an improved continuous shooting speed.

[0002]

2. Description of the Related Art A subject image formed by a focus detection optical system is received by a charge storage type sensor, and the sensor output is arithmetically processed to detect a defocus amount of a subject image plane with respect to a planned focal plane of a photographing optical system. However, there is known a single AF area automatic focusing camera that achieves the focus of the photographing optical system by driving the focusing lens according to the defocus amount.

Further, a plurality of sets of focus detection optical systems and sensors are provided, focus detection is carried out in a plurality of areas set on the photographing screen to obtain a plurality of defocus amounts, and one defocus amount is calculated based on these defocus amounts. Determine the final defocus amount,
There is also known a multi-AF area automatic focus adjustment camera that achieves focusing of a photographing optical system by driving a focusing lens according to the final defocus amount.

[0004]

However, the above-described multi-AF area auto-focusing camera has an increased number of AF areas as compared with the single AF-area auto-focusing camera, and accordingly, the charge accumulation time of the sensor, There is a problem in that the time required for AF (hereinafter, referred to as AF time) including the charge transfer time, the focus detection calculation time, and the like increases, and the responsiveness of focus adjustment deteriorates.

In particular, when performing a continuous shooting operation with an automatic focusing camera in a multi-AF area, there is a problem that the AF time between frames increases and the frame speed cannot be increased.

FIG. 10 is a time chart of an AF sequence for explaining the above problem. In order to make the explanation easy to understand, assuming that the first and second sensors corresponding to the two AF areas are operated for focus detection,
The F time Ta is expressed by the following equation.

## EQU1 ## Ta = MAX (I1, I2) + F1 + F2 + A1 + A2 + L (1) where I1 and I2 represent the charge storage time of the first and second sensors, and F1 and F2 represent the charge accumulation times of the first and second sensors. Indicates the output transfer time. A1 and A2 represent the output calculation time of the first and second sensors, and L represents the lens driving time.

An object of the present invention is to provide an automatic focusing camera for a multi-AF area which enables high-speed continuous shooting.

[0008]

The present invention will be described with reference to FIG. 1 which is a claim correspondence diagram. According to the invention of claim 1, a subject image is formed on a photographing screen 901 set on a planned focal plane. A photographing optical system 902 and a plurality of focus detection areas 903a, 903b, ... Set in the photographing screen 901.
A plurality of photoelectric conversion means 904 provided corresponding to each
a, 904b, ... And each focus detection area 903a, 90
The photoelectric conversion means 90 corresponding to the light flux passing through 3b, ...
4a, 904b, ... Focus detection optical system 905 for forming a subject image and a plurality of photoelectric conversion means 904a, 9a.
04b, ... Depending on the defocus amount calculated by the focus detection calculation unit 906, which calculates the defocus amount of the imaging plane of the photographing optical system 902 with respect to the planned focal plane. Photo-taking optical system 90
It is applied to an automatic focusing camera provided with a driving unit 907 for driving 2. Then, in the case of continuous shooting means 908 for continuously shooting, and in the case of continuous shooting by this continuous shooting means 908, a plurality of focus detection areas 903a, 903.
The focus detection calculation unit 906 calculates the defocus amount based on the output of the photoelectric conversion unit corresponding to the predetermined focus detection region of b, ... , 903b, ... Corresponding to the outputs of the photoelectric conversion means 904a, 904b, ..., The focus detection calculation means 906 is provided with a control means 909 for calculating the defocus amount, thereby achieving the above object. To do. In the automatic focusing camera according to the second aspect, the plurality of photoelectric conversion units 904a, 904b, ... Are charge accumulation type. Furthermore, in the automatic focusing camera according to claim 3, a plurality of focus detection areas 903a and 903 are provided.
One of 3b, ... Is set at the center of the shooting screen 901, and the focus detection is performed by the control unit 909A based on the output of the photoelectric conversion unit corresponding to the focus detection area at the center of the shooting screen in the case of continuous shooting. The calculation means 906 is made to calculate the defocus amount. In the automatic focusing camera according to claim 4, a plurality of focus detection areas 903a,
.. are set for different directions in the photographing screen 901, and the control unit 909B outputs the photoelectric conversion unit corresponding to the focus detection area in the specific direction in the photographing screen 901 in the case of continuous photographing. The focus detection calculation means 906 is made to calculate the defocus amount based on the above. The automatic focus adjustment camera according to claim 5 includes a setting member 910 that arbitrarily sets a region for performing focus detection in the case of continuous shooting from a plurality of focus detection regions, and by the control unit 909C, in the case of continuous shooting, Setting member 9
The focus detection calculation means 906 is made to calculate the defocus amount based on the output of the photoelectric conversion means corresponding to the focus detection area set by 10.

[0009]

In the present invention, the multi A using a plurality of sensors
During continuous shooting with the F camera, the AF time between frames is shortened by using a predetermined sensor, and the position of the sensor used is optimized so that even a small number of sensors miss the subject. I try to reduce things.

FIG. 9 is a time chart of the AF sequence for explaining the above solution. Assuming a case in which only the second sensor of the first and second sensors corresponding to the two AF areas is operated for focus detection, the AF time Ta can be calculated by the following equation (2). expressed.

## EQU00002 ## Ta = I2 + F2 + A2 + L (2) That is, as compared with the above equation (1), the accumulation time (I1,
It can be seen that the AF time is almost halved except for I2).

[0011]

【Example】

-First Embodiment- Fig. 2 shows the configuration of a first embodiment of the present invention. The lens 2 is configured to be replaceable with respect to the body 1, and the figure shows a state in which the lens 2 is mounted on the body 1. Lens 2
A photographic optical system 3 is provided inside, and a light flux from a subject that has passed through the photographic optical system 3 is split by a main mirror 4 composed of a half mirror in the directions of a sub mirror 5 and a finder 6. The light beam further deflected in the body bottom direction by the sub-mirror 5 is guided to a focus detection optical system 7 arranged near the planned focal plane of the photographing optical system 3.

FIG. 3 shows the structures of the focus detection optical system 7 and the charge storage type sensor 8, and FIG. 4 shows the arrangement of a plurality of focus detection areas set in the photographing screen. In the shooting screen,
As shown in (3), three focus detection areas are set. E
C is a focus detection area in the center of the screen, EL is a focus detection area on the left side of the screen, and ER is a focus detection area on the right side of the screen. The focus detection optical system 7 has three re-imaging optical systems corresponding to the center of the photographic screen and the three focus detection areas on the left and right thereof.

The focus detection optical system 7 has openings 370 and 47.
Field mask 371 having 0, 570, condenser lenses 372, 472, 572, three pairs of aperture openings 37.
Aperture mask 375 having 3,374,473,474,573,574, three pairs of reimaging lenses 376,37
7, 476, 477, 576, 577, and the charge storage type sensor 8 has three pairs of light receiving parts 380, 381, 48.
It consists of 0, 481, 580, 581.

Three pairs of aperture openings 373, 374, 47
3, 474, 573 and 574 are condenser lenses 3
A pair of regions 331, 33 symmetrical with respect to the optical axis of the surface 30 near the exit pupil of the photographing optical system 3 by 72, 472, 572.
A light beam projected on the second area and passing through this area first forms a primary image in the vicinity of the visual field mask 371.

The primary image formed in the opening 370 of the field mask 371 passes through the condenser lens 372, the pair of aperture openings 373 and 374, and the pair of re-imaging lenses 37.
6, 377, the light receiving portion 38 of the charge storage sensor 8
It is re-imaged as a pair of secondary images on 0,381.

Further, the primary image formed in the opening 470 of the field mask 371 passes through the condenser lens 472 and the pair of aperture openings 473 and 474, and the charge accumulating type by the pair of re-imaging lenses 476 and 477. It is re-imaged as a pair of secondary images on the light receiving portions 480 and 481 of the sensor 8.

Further, the opening 570 of the field mask 371.
The primary image formed on the condenser lens 572, 1
It passes through the pair of aperture openings 573 and 574 and is re-imaged as a pair of secondary images on the light receiving portions 580 and 581 of the charge storage type sensor 8 by the pair of re-imaging lenses 576 and 577. The light intensity distributions of these three pairs of secondary images are shown in FIG.
0, 381, 480, 481, 580, 581 converts into an electrical object image signal.

In the first embodiment, the focus detection area E
Light receiving parts 480, 481 and 580, 58 corresponding to L and ER
1 is the first sensor 9, and the light receiving portions 380 and 381 corresponding to the focus detection area EC are the second sensor 10.

If the continuous shooting is not performed, the two pairs of electrical subject image signals of the first sensor 9 and the pair of electrical subject image signals of the second sensor 10 are both taken into the microcomputer 14, and the microcomputer 14 The focus detection calculation circuit 12 calculates the three focus detection areas E by calculating the relative positional relationship of these subject image signals.
The defocus amounts d1, d2, d3 between the image plane of the photographing optical system 3 and the planned focal plane at L, EC, ER are detected. Next, the three detected defocus amounts d1, d2, d3
The rear focus, that is, the defocus amount indicating a closer distance, is selected from among these to be the final defocus amount d.

In the case of continuous shooting, the second sensor 10
A pair of electrical subject image signals is the microcomputer 1
4, the focus detection calculation circuit 12 in the microcomputer 14 calculates the relative positional relationship of the subject image signals, so that the image plane of the photographic optical system 3 and the planned focal plane in the central focus detection area EC are obtained. The defocus amount d2 is detected, and this is set as the final defocus amount d.

The drive control circuit 13 included in the microcomputer 14 controls the rotation direction and the rotation amount of the motor 15 according to the final defocus amount d. The motor 15 is connected to the photographic optical system 3, the photographic optical system 3 moves in the optical axis direction and is driven so that the final defocus amount d becomes 0, and the photographic optical system 3 is brought into a focused state.

Further, the continuous photographing device 16 has a main mirror 4, a sub-mirror 5, a shutter 17, and a winding device 18 depending on the photographing mode (one frame photographing mode or continuous photographing mode) set by the photographer and the operation state of the release button 19. Is controlled to perform one frame shooting or continuous shooting operation. Information on the shooting mode set by the photographer and information on the operating state at the time of shooting are input to the sensor control circuit 11, and the first sensor 9 and the second sensor 10 are controlled. That is, the sensor control circuit 11 operates the second sensor 10 between frames during continuous shooting, and otherwise operates both the first sensor 9 and the second sensor 10.

FIG. 5 is an operation flowchart of the microcomputer 14 which constitutes the sensor control circuit 11, the focus detection calculation circuit 12, and the drive control circuit 13. The operation of the first embodiment will be described with reference to this flowchart.
The microcomputer 14 starts a series of processes when the power of the camera is turned on in step S100, and proceeds to step S101. In step S101, it is checked whether or not the focus detection operation is possible. If it is possible, the process proceeds to step S102, and if not possible, the process waits in step S101 until it becomes possible. Here, the focus detection operation is possible means that the continuous photographing device 16 is not performing the photographing operation, the main mirror 4 and the sub-mirror 5 are inserted in the optical path, and the light flux that has passed through the photographing optical system 3 causes the object to be photographed. An image is formed on the first sensor 9 and the second sensor 10.

In step S102, it is checked based on the information from the continuous photographing device 16 whether or not the frame is currently being continuously photographed. If it is the frame being continuously photographed, the AF time between the frames is shortened. To select the second sensor 10 for step S
Proceed to 107, and if it is not between frames during continuous shooting, step S
Go to 103. Here, the frame interval refers to a period from completion of mirror down of the main mirror 4 and the sub mirror 5 to start of next mirror up. Step S10
In 3, the first sensor 9 and the second sensor 10 are selected to perform the charge accumulation operation, and the process proceeds to step S104. In step S104, the subject image signals are read from the first sensor 9 and the second sensor 10, and in the next step S105, the subject image signals are processed to determine the defocus amounts d1, d2, d3 corresponding to the focus detection areas EL, EC, ER. Calculate In step S106, the defocus amounts d1, d2, d3
Of these, the defocus amount indicating the rearmost pin is determined as the final defocus amount, and the process proceeds to step 111.

On the other hand, when it is not between frames during continuous shooting, the second sensor 10 is selected in step S107 to cause the charge accumulation operation, and the process proceeds to step S108. Step S10
In step 8, the subject image signal is read from the second sensor 10, and in the following step S109, the subject image signal is processed to calculate the defocus amount d2 corresponding to the focus detection area EC. In step S110, the defocus amount d2 is set as the final defocus amount, and the process proceeds to step 111.

In step S111, a lens drive amount L indicating how much the photographing optical system 3 should be driven to achieve the in-focus state is calculated according to the final defocus amount d. In the following step S112, the motor 15 is driven to move the photographic optical system 3 by the lens drive amount L, and then the process returns to step 101 to repeat the above operation.

As described above, since the focus detection operation is always performed in the three focus detection areas except during continuous photographing, the object can be captured easily. Furthermore, during continuous shooting, the focus detection operation is performed only in the focus detection area at the center of the screen, and
The time can be shortened, high-speed continuous shooting is possible, and the subject is likely to be located in the center of the screen.Therefore, even if the focus detection area used is limited to the center of the screen, the ability to capture the subject will be extremely high. It never drops.

-Second Embodiment- FIG. 6 shows the structure of a focus detection optical system 7A and a charge storage type sensor 8A according to a second embodiment of the present invention. FIG. 7 shows the vertical direction set in the photographing screen. The focus detection area EV and the horizontal focus detection area EH are shown in FIG. The configuration of the second embodiment is the same as the configuration shown in FIG. 2 except for the focus detection optical system 7A and the charge storage type sensor 8A, and its illustration and description are omitted. The focus detection optical system 7A has two re-imaging optical systems corresponding to the two focus detection areas EV, EH in the vertical and horizontal directions at the center of the screen. Further, the focus detection optical system 7A has a field mask 1 having a cross-shaped opening 170.
71, condenser lens 172, two aperture openings 1
Aperture mask 17 having 73, 174, 273, 274
5, 2 pairs of re-imaging lenses 176, 177, 276, 27
7, the charge storage sensor 8A includes two pairs of light receiving portions 1
It consists of 80,181 and 182,183.

The pair of aperture openings 173 and 174 are symmetric with respect to the optical axis of the surface 30 near the exit pupil of the photographing optical system 3 by the condenser lens 172.
The other pair of aperture openings 273 and 274 are projected by the condenser lens 172, and a pair of areas 231 and 231 symmetrical to the optical axis of the surface 30 near the exit pupil of the photographing optical system 3 are projected.
32. The light flux passing through these regions first forms a primary image near the field mask 171. The primary image formed in the opening 170 of the field mask 171 is a condenser lens 172, two pairs of aperture openings 173, 174,
273, 274 and two pairs of re-imaging lenses 176, 1
77, 276, and 277, two on the light receiving portions 180 and 181 and the light receiving portions 182 and 183 of the charge storage type sensor 8A.
It is re-imaged as a secondary image of the pair. The light intensity distributions of the two pairs of secondary images are the light receiving portions 180, 181 and the light receiving portions 182, 1
It is converted by 83 into an electrical subject image signal.

In the second embodiment, the focus detection area EV
The light receiving portions 182 and 183 corresponding to the first sensor 9 shown in FIG. 2 and the light receiving portions 180 and 1 corresponding to the focus detection area EH are shown.
81 is the second sensor 10. When responsiveness is required as in continuous shooting, the sensor control circuit 11 selects the second sensor 10, and when continuous shooting is not in progress, both the first sensor 9 and the second sensor 10 are selected.

FIG. 8 shows a sensor control circuit 11, a focus detection arithmetic circuit 12, and a drive control circuit 13 in the second embodiment.
3 is an operation flowchart of the microcomputer 14 constituting the above. The operation of the second embodiment will be described with reference to this flowchart. The microcomputer 14
When the power of the camera is turned on in step S200, a series of processes is started, and the process proceeds to step S201. Step S2
At 01, it is checked whether or not the focus detection operation is possible. If yes, the process proceeds to step S202, and if not, the process waits at step S201 until it becomes possible.

In step S202, it is checked based on the information from the continuous photographing device 16 whether or not the frame is currently being continuously photographed. If it is the frame being continuously photographed, the AF time between the frames is shortened. To select the second sensor 10 for step S
Proceed to step 207, and if it is not between frames during continuous shooting, step S
Go to 203.

In step S203, the first sensor 9 and the second sensor 10 are selected to perform the charge accumulation operation, and the process proceeds to step S204. In step S204, the subject image signals are read from the first sensor 9 and the second sensor 10, and in the following step S205, the subject image signals are processed to calculate the defocus amounts d1 and d2 corresponding to the focus detection areas EV and EH. In step S206, the defocus amount d
The defocus amount indicating the rearmost pin among 1 and d2 is determined as the final defocus amount, and the process proceeds to step 211.

On the other hand, when it is not between frames during continuous shooting, the second sensor 10 is selected in step S207 to cause the charge accumulation operation, and the process proceeds to step S208. Step S20
In step 8, the subject image signal is read from the second sensor 10, and in the following step S209, the subject image signal is processed to calculate the defocus amount d2 corresponding to the focus detection area EH. In step S210, the defocus amount d2 is determined as the final defocus amount, and the process proceeds to step 211.

In step S211, a lens driving amount L is calculated according to the final defocus amount d, which indicates how much the photographing optical system 3 should be driven to bring the lens into focus. In subsequent step S212, the motor 15 is driven to drive the lens drive amount L.
After only moving the photographing optical system 3, the process returns to step 201 and the above operation is repeated.

As described above, the focus detection operation is always performed in the two focus detection areas in the vertical direction and the horizontal direction except during continuous shooting, so that the object can be captured easily. Furthermore, during continuous shooting, the AF time can be shortened by performing the focus detection operation only in the horizontal focus detection area, which enables high-speed continuous shooting and allows the subject to be positioned within the horizontal focus detection area. Therefore, even if the focus detection area to be used is limited to the lateral area, the capturing property of the subject does not extremely deteriorate.

In each of the above embodiments, the second sensor is forcibly selected between frames during continuous shooting, but a setting means (not shown) is separately provided to allow the photographer to switch between frames during continuous shooting. You may make it select the sensor used for. In this way, the intention of the photographer can be reflected by the composition, so that the capturing property of the subject is further improved.

It is also possible to provide a posture detecting means for detecting the posture of the camera body and select a sensor to be used between frames during continuous shooting according to the posture of the camera. In this way, in the case of vertical position shooting, the vertical focus detection area EV in FIG. 7 is selected, so that the deterioration of the subject capturing property due to the posture is eliminated.

Furthermore, the number and arrangement of focus detection areas are not limited to those in the above embodiment.

In the structure of the above embodiment, the photographing optical system 3 is the photographing optical system, the first sensor 9 and the second sensor 10 are photoelectric conversion means, the focus detection optical system 7 is the focus detection optical system, and the focus detection is performed. The calculation circuit 13 serves as a focus detection calculation means,
The drive control circuit 13 and the motor 15 constitute drive means, the continuous photographing device 16 constitutes continuous photographing means, and the microcomputer 14 and the sensor control circuit 11 constitute control means.

[0041]

As described above, according to the present invention, in the case of continuous shooting, focus detection calculation is performed based on the output of the photoelectric conversion means corresponding to a predetermined focus detection area among a plurality of focus detection areas. If the continuous shooting is not performed, the focus detection calculation is performed based on the outputs of the photoelectric conversion units corresponding to all the focus detection areas. Therefore, the AF time between frames can be shortened, and the high-speed continuous shooting is performed. Is possible. In addition, since the focus detection area used in the case of continuous shooting is set in advance, when performing continuous shooting in the multi-AF mode, the purpose is to cancel the multi-AF area mode and manually select the AF area before continuous shooting. No need to do.
Furthermore, since the focus detection area used in the case of continuous shooting is set to the central area of the shooting screen where the subject is likely to be located, high-speed continuous shooting can be performed without degrading the capture of the subject. Since the detection direction of the focus detection region used in the case of continuous shooting is specified, high-speed continuous shooting can be performed without deteriorating the capturing property of the subject. Since the photographer can arbitrarily set the focus detection area used in the case of continuous shooting, the intention of the photographer is reflected by the composition, and the capturing property of the subject is improved.

[Brief description of drawings]

FIG. 1 is a complaint correspondence diagram.

FIG. 2 is a block diagram showing a configuration of a first exemplary embodiment of the present invention.

FIG. 3 is a perspective view showing the configurations of a focus detection optical system and a charge storage type sensor according to the first embodiment.

FIG. 4 is a diagram showing a focus detection area according to the first embodiment.

FIG. 5 is a flowchart showing the operation of the microcomputer of the first embodiment.

FIG. 6 is a perspective view showing the configurations of a focus detection optical system and a charge storage type sensor according to a second embodiment.

FIG. 7 is a diagram showing a focus detection area according to a second embodiment.

FIG. 8 is a flowchart showing the operation of the microcomputer of the second embodiment.

FIG. 9 is a time chart of an AF operation for explaining the solution according to the present invention.

FIG. 10 is a time chart of an AF operation for explaining the problems of the conventional automatic focusing camera.

[Explanation of symbols]

 1 Body 2 Lens 3,902 Shooting Optical System 4 Main Mirror 5 Sub Mirror 6 Finder 7,7A, 905 Focus Detection Optical System 8,8A Sensor 9 1st Sensor 10 2nd Sensor 11 Sensor Control Circuit 12 Focus Detection Calculation Circuit 13 Drive Control Circuit 14 Microcomputer 15 Motor 16 Continuous photographing device 17 Shutter 18 Winding device 19 Release button 901 Photographing screen 903a, 903b Focus detection area 904a, 904b Photoelectric conversion means 906 Focus detection calculation means 907 Driving means 908 Continuous photographing means 909, 909A, 909B , 909C Control means 910 Setting member

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI technical display location 9119-2K G03B 3/00 A

Claims (5)

[Claims] 1. A photographic optical system for forming a subject image on a photographic screen set on a planned focal plane, and a plurality of photoelectric cells provided corresponding to each of a plurality of focus detection areas set on the photographic screen. A conversion unit, a focus detection optical system that guides the light flux that has passed through each of the focus detection regions to a corresponding photoelectric conversion unit to form a subject image, and the focus detection optical system for the planned focal plane based on the outputs of the plurality of photoelectric conversion units. Automatic focus provided with focus detection calculation means for calculating the defocus amount of the imaging surface of the photographing optical system, and drive means for driving the photographing optical system according to the defocus amount calculated by the focus detection calculation means. In the adjustment camera, continuous shooting means for continuously performing shooting operations, and in the case of continuous shooting by this continuous shooting means, the light corresponding to a predetermined focus detection area among the plurality of focus detection areas is used. The focus detection calculation means is caused to calculate the defocus amount based on the output of the photoelectric conversion means, and the focus detection calculation means based on the outputs of the photoelectric conversion means corresponding to all the focus detection areas when the continuous shooting is not performed. An automatic focus adjustment camera, comprising: a control means for calculating a defocus amount. 2. The automatic focusing camera according to claim 1, wherein the plurality of photoelectric conversion units are of a charge storage type. 3. The automatic focusing camera according to claim 1, wherein one of the plurality of focus detection areas is set at a center of the shooting screen, and the control unit controls the continuous shooting. In this case, the focus detection calculation means is caused to calculate the defocus amount based on the output of the photoelectric conversion means corresponding to the focus detection area at the center of the photographing screen. 4. The automatic focus adjustment camera according to claim 1, wherein the plurality of focus detection areas are set in different directions in the photographing screen, and the control unit includes: In the case of the continuous shooting, the focus detection calculation unit is caused to calculate the defocus amount based on the output of the photoelectric conversion unit corresponding to the focus detection region in the specific direction in the photographing screen. Focusing camera. 5. The automatic focusing camera according to claim 1, wherein a setting member that arbitrarily sets a focus detection area in the case of continuous shooting is selected from the plurality of focus detection areas. In the case of the continuous shooting, the control unit causes the focus detection calculation unit to calculate the defocus amount based on the output of the photoelectric conversion unit corresponding to the focus detection region set by the setting member. An autofocus camera that is characterized.