JPH06265774A - Automatic focusing camera - Google Patents

Abstract

PURPOSE:To provide an automatic focusing camera capable of performing accurate predicted driving even at low luminance. CONSTITUTION:A 1st sensor 9 and a 2nd sensor 10 whose detecting sensitivity of an object image is higher than the 1st sensor 9 are juxtaposed by a photodetector 8 receiving the object image guided from a focus detection optical system 7. Every time the signal of the object image is outputted from the photodetector 8, the defocusing amount of the object image is calculated by a focus detection arithmetic means 12 based on the signal. The moving speed of the object image surface is calculated based on the defocusing amount of previous time and this time and the interval of the calculated time. By discriminating that the object moves when the moving speed is equal to or above a specified value, output from the 2nd sensor 10 is selected by a control means 11 as output from the photodetector 8.

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 which follows a moving subject without delay.

[0002]

2. Description of the Related Art A subject image formed by a conventional focus detection optical system is received by a charge storage type sensor, and the sensor output is arithmetically processed to determine the defocus amount of the subject image plane with respect to the planned focal plane of the photographing optical system. 2. Description of the Related Art There is known an automatic focus adjustment camera which detects and drives a focusing lens according to the defocus amount to achieve focusing of a photographing optical system. Furthermore, it is determined whether or not the subject is moving from a plurality of defocus amounts that occur in time series, and if it is determined that the subject is moving, the normal lens drive amount is corrected to drive the lens. A driving method (hereinafter, referred to as predictive driving) is known in which a moving subject is kept in focus and continuously in focus.

The basic principle of subject movement determination in the above-described predictive driving method will be described with reference to FIG. In FIG. 12, the vertical axis represents the position of the image plane, and the horizontal axis represents time. The solid line represents the locus of the subject image plane when the photographing optical system is ideally driven to follow the moving subject, and the broken line represents the position of the image plane corresponding to the actual lens position. Therefore, the difference between the solid line and the broken line represents the difference in image plane position = defocus amount. Here, the defocus amount at time t1 is d1, the defocus amount at time t2 is d2, and the image plane movement amount due to lens driving between times t1 and t2 is L12.
Then, the moving speed v12 of the image plane due to the movement of the subject is expressed by the equation (1).

[Equation 1] If the absolute value of the image plane moving speed v12 is equal to or larger than a predetermined value, it can be determined that the subject is moving.

When it is determined that the subject is moving, the lens drive is performed so that the solid line and the broken line coincide with each other at time t3 so that the defocus amount becomes 0 in consideration of the movement of the image plane accompanying the movement of the subject. It can be performed. The lens driving amount at this time may be determined in accordance with the corrected defocus amount d2 ′ obtained by correcting the defocus amount d2 by the equation (2).

[Equation 2]

[0005]

In the above method, since the moving speed of the object image plane is calculated from the defocus amount between two times, the responsiveness to the change in the moving speed of the image plane is the time at which the defocus amount is obtained. Depends on the interval.
Therefore, it is desirable to set the above interval sufficiently short in order to perform accurate prediction drive. However, when the subject brightness becomes low, the amount of light received by the charge storage type sensor decreases and the charge storage time becomes longer, so the detection interval of the defocus amount becomes longer and the subject speed suddenly changes. Was unable to measure the correct image plane movement speed, and as a result, it caused overrun due to predictive driving.

Further, a plurality of focus detection optical systems and sensors are provided, focus detection is performed in a plurality of focus detection areas set on the photographing screen to obtain a plurality of defocus amounts, and 1 is calculated based on the plurality of defocus amounts. There is also known a so-called multi-AF area type automatic focusing camera that determines one final defocus amount and drives a focusing lens according to the final defocus amount to achieve focusing of the photographing optical system. However, the multi-AF area type automatic focus adjustment camera has a single AF area type,
That is, the charge accumulation time of the sensor, the charge transfer time, the focus detection calculation time, etc. are included by the amount that the focus detection area is increased compared to the camera that performs the focusing operation based on the defocus amount in the single focus detection area. The time required for focus adjustment (hereinafter referred to as AF time) increases, the detection interval of the defocus amount increases, and for the same reason as when the brightness is low, when the subject speed changes suddenly, the correct image plane movement speed is set. It was not possible to measure, and as a result, overrun occurred due to prediction drive.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems and provide an automatic focusing camera capable of performing accurate predictive driving even at low brightness. Further, it is another object of the present invention to improve the accuracy at the time of predictive driving in an automatic focus adjustment camera having a plurality of focus detection areas.

[0008]

To explain with reference to FIG. 1 showing an embodiment, the invention according to claim 1 is a photographing optical system 3 for forming a subject image on a planned focal plane, and a photographing optical system. Focus detection optical system 7 for detecting the focus state of the optical system 3
And a light receiving means 8 for receiving a subject image formed by the focus detecting optical system 7, and a focus detecting calculation for calculating the defocus amount of the image plane of the photographing optical system 3 with respect to the planned focal plane based on the output of the light receiving means 8. Means 12 and focus detection calculation means 12
A subject movement determination unit 13 that determines whether or not the subject is moving based on a plurality of defocus amounts calculated in time series, and the focus position of the photographing optical system 3 is adjusted based on the defocus amount. When it is determined that the subject is moving, an automatic focus adjustment camera including focus control means 16 and 15 that corrects the adjustment amount of the focus position of the photographing optical system 3 so as to reduce the focus error due to the movement of the subject. Applied to. The above-mentioned purpose is to use the light receiving means 8
In addition, the first sensor 9 and the second sensor 10 having a higher detection sensitivity of a subject image than the first sensor 9 are arranged in parallel, and the subject movement determination means 13 determines that the subject is moving. At this time, the light receiving control means 1 for selecting the output of the second sensor 10 as the output of the light receiving means 8.
This is achieved by providing 1.

First sensor 9 and second sensor 1
In order to change the detection sensitivity of the subject image at 0, for example, the first sensor 9 and the second sensor 10 are charge accumulation type sensors that accumulate charges according to the amount of received light, and the subject images of the same brightness are received for a certain period of time. At this time, the charge accumulation amount of the first sensor 9 and the second sensor 10 is set to be larger in the second sensor 10 than in the first sensor 9. In this case, the pixel area of the second sensor 10 may be larger than the pixel area of the first sensor 9. Alternatively, as shown in FIG. 5, in the focus detection optical system, a first focus detection optical system 7A for forming a subject image on the first sensor 9A and a subject image formed on the second sensor 10A. And a second focus detection optical system 7B for
The first sensor 9A and the second sensor 10A are
Focus detection optical system 7A and second focus detection optical system 7B
The pixel area when projected onto the same plane X on the object space side of
The second sensor 10A may be larger than the first sensor 9A. In the above camera, when the subject movement determining means 12 determines that the subject is moving and the brightness of the subject image is below a predetermined position, the light receiving control means 11 outputs the output of the second sensor 10 to the light receiving means 8. You may make it select as an output.

If it is explained in association with FIG. 6, the invention according to claim 6 is for detecting the focus state of the photographing optical system 3 for forming a subject image on the expected focal plane and the photographing optical system 3. Focus detection optical system 7, light receiving means 8A for receiving the subject image formed by the focus detection optical system 7, and light receiving means 8
Focus detection calculation means 12 for calculating the defocus amount of the image plane of the photographing optical system with respect to the planned focal plane based on the output of A.
A subject movement determination unit 13 that determines whether or not the subject is moving based on the plurality of defocus amounts calculated by the focus detection calculation unit 12 in time series, and the photographing optical system 3 based on the defocus amount. In addition to adjusting the focal position of the subject, when it is determined that the subject is moving, the photographing optical system 3 is configured to reduce the focus error associated with the subject movement.
Control means 16, 15 for correcting the adjustment amount of the focal position of the
Applies to autofocus cameras with and. And
The above-described object is to detect the subject image by the light-receiving means 8A, and the light-receiving means 8A when the subject movement determining means 13 determines that the subject is moving, and the sensitivity switching means 17 that can switch the sensitivity of the subject image between at least two levels. This is achieved by providing the sensitivity control means 11A for controlling the sensitivity switching means 17 so that the detection sensitivity of (1) becomes high. In this case, when the subject movement determining means 13 determines that the subject is moving, and when the brightness of the subject image is less than or equal to a predetermined value, the sensitivity switching means 17 is controlled so that the detection sensitivity of the light receiving means 8A becomes high. Alternatively, the sensitivity control means 11A may be configured.

To describe in association with FIG. 8, the invention according to claim 8 is set in the photographing optical system 3 for forming a subject image on the planned focal plane and in the photographing screen by the photographing optical system 3. A focus detection optical system 20 for detecting focus states in a plurality of focus detection areas, and a plurality of sensors 21, 22 for receiving a plurality of subject images formed by the focus detection optical system 20 separately for each focus detection area. , 23, a focus detection calculation means 12A for calculating the defocus amount of the image plane of the photographing optical system 3 with respect to the planned focal plane based on the output of the light reception means 24, and the focus detection calculation means 12A A subject movement determination unit 13A that determines whether or not the subject is moving based on a plurality of defocus amounts calculated in series, and the focus position of the photographing optical system 3 is adjusted based on the defocus amount. In both cases, when it is determined that the subject is moving, automatic focus adjustment including focus control means 16 and 15 for correcting the adjustment amount of the focus position of the photographing optical system 3 so as to reduce the focus error due to the movement of the subject. Applied to camera. The above-described object is to detect the plurality of sensors 21 to 23 included in the light receiving unit 24 when the subject movement determination unit 13A determines that the subject is moving.
This is achieved by providing focus detection area selection means 13A, 11B that selects only the output of the sensor corresponding to a specific focus detection area as the output of the light receiving means 24.

Also in the automatic focusing camera according to the eighth aspect, the plurality of sensors 21 to 23 can be charge accumulation type sensors that accumulate charges according to the amount of received light. The focus detection area selection means 13A, 11B outputs the output of the sensor corresponding to the focus detection area determined by the subject movement determination means 13A, for example, as the light receiving means 2.
4 output. The plurality of focus detection areas can partially overlap with each other and extend in different directions in the shooting screen of the shooting optical system 3. In this case, the focus detection area selection means 13A, 11B may select the output of the sensor corresponding to the high-brightness focus detection area of the focus detection area as the output of the light receiving means 24.

[0013]

According to the first aspect of the invention, when the subject movement determining means 13 determines that the subject is moving, the output of the second sensor 10 is selected as the output of the light receiving means 8. Second
Since the sensor 10 has high detection sensitivity of the subject image, the subject image can be detected quickly even at low brightness.

In the sixth aspect of the invention, when the subject movement determining means 13 determines that the subject is moving, the light receiving means 8 is used.
The object image detection sensitivity of A is switched to the higher side by the sensitivity switching unit 17, and the object image can be quickly detected even at low brightness.

According to the eighth aspect of the present invention, when the subject movement determining means 13A determines that the subject is moving, only the output of a specific sensor of the plurality of sensors 21, 22, 23 of the light receiving means 24 is detected by the light receiving means 24. Selected as output,
As a result, the amount of data from the light receiving means 24 is reduced and the time required for the arithmetic processing is shortened.

Incidentally, in the section of means and action for solving the above problems for explaining the constitution of the present invention, the drawings of the embodiments are used for making the present invention easy to understand. It is not limited to.

[0017]

【Example】

First Embodiment A first embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a block diagram of this embodiment. The lens 2 is configured to be replaceable with respect to the body 1, and the lens 2 is attached to the body 1 in the figure. The lens 2 includes a photographing optical system 3,
The light flux from the subject that has passed through the photographing optical system 3 is split by the main mirror 4 using a half mirror in the direction of the sub-mirror 5 and the viewfinder 6. The light beam deflected in the bottom direction of the body 1 (downward in the figure) 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. 2 shows a schematic structure of the focus detection optical system 7 and the light receiving element 8 for focus detection. The focus detection optical system 7 includes a field mask 71 having an opening 70, a condenser lens 72, an aperture mask 75 having a pair of aperture openings 73 and 74, and a pair of re-imaging lenses 76 and 77. There is. The light receiving element 8 includes a pair of light receiving portions 80 and 81 arranged below the light receiving element 8 and a pair of light receiving portions 82 and 83 arranged above the light receiving element 8, and the light receiving portions 80 and 81 are the first sensors 9 respectively. The light receiving portions 82 and 83 form the second sensor 10. An opening 70 on the optical axis is provided by the photographing optical system 3 (FIG. 1).
The primary image formed in the vicinity of is re-formed as a pair of left and right secondary images on the light receiving units 80 to 83.

As shown in FIG. 3, the light receiving portions 80 and 81 and the light receiving portions 82 and 83 have a plurality of rectangular pixels PS1 and PS2 which are arranged in a row in the respective arrangement directions.
Electric charges corresponding to the light receiving amounts of S1 and PS2 are accumulated and output to the microcomputer 14 described later. Pixel PS of light receiving portions 80 and 81
The pitch P1 and the height W1 of 1 are set to be smaller than the pitch P2 and the height W2 of the pixel PS2 of the light receiving units 82 and 83. Therefore, the pixel area P2 × W2 of the light receiving portions 82 and 83 is equal to the pixel area P1 × W of the light receiving portions 80 and 81.
The charge storage time for obtaining the same output level, which is larger than 1, is shorter in the second light receiving portions 82 and 83. That is, the second light receiving portions 82 and 83 have higher detection sensitivity of the subject image.

As shown in FIG. 2, a pair of aperture openings 7 are provided.
3, 74 is a condenser lens 72 for photographing optical system 3
Is projected onto a pair of regions 31 and 32 that are symmetric with respect to the optical axis of the surface 30 near the exit pupil. The light flux passing through these regions 31 and 32 first forms a primary image near the field mask 71. The primary image formed in the opening 70 of the field mask 71 is further condensed by the condenser lens 72 and the pair of aperture openings 7.
3 and 74, a pair of re-imaging lenses 76 and 77 are provided on the light receiving elements 80 and 82 on the light receiving element 8 and the light receiving portions 81 and 83.
It is formed as a pair of secondary images on and above. The intensity distribution of the secondary image is photoelectrically converted by the light receiving units 80 to 83 and becomes an electrical object image signal. At this time, the light receiving units 80 and 81 and the light receiving unit 8
Since the pixel areas are different from those of Nos. 2 and 83, the charge accumulation time is independently set so that the output level is appropriate for performing the focus detection calculation process.

As shown in FIG. 1, the pair of electrical subject image signals of the first sensor 9 and the pair of electrical subject image signals of the second sensor 10 are supplied to the microcomputer 14 according to the control operation of the control means 11. Are taken into the focus detection calculation means 12. The focus detection calculation means 12 calculates the relative positional relationship of the captured subject image signal and detects the defocus amount d between the image plane of the photographing optical system 3 and the planned focal plane. The subject movement determination means 13 of the microcomputer 14 stores the defocus amount calculated by the focus detection calculation means 12 and the calculation time as a pair. Further, the rotation amount of a motor 15 described later is monitored to measure the lens drive amount from the previous defocus amount calculation time to the current defocus amount calculation time, and the lens drive amount is converted into an image plane movement amount. To do. Next, assuming that the previous defocus amount is d1, the calculation time is t1, the current defocus amount is d2, the calculation time is t2, and the image plane movement amount caused by the lens driving from the time t1 to the time t2 is L12. ), The image plane movement velocity v12 between times t1 and t2 is obtained.

When the absolute value of the image plane moving speed v12 is smaller than the predetermined value V, it is determined that the subject is stationary, and the drive control means 16 included in the microcomputer 14 determines the motor 15 according to the current defocus amount d2. Control the direction and amount of rotation of. By the rotation of the controlled motor 15, the photographing optical system 3 is driven in the optical axis direction so that the defocus amount d becomes 0, and the photographing optical system 3 is brought into a focused state. When the absolute value of the image plane movement velocity v12 is smaller than the predetermined value V, it is determined that the subject is moving, and the correction defocus d2 ′ is calculated by the equation (2) so that the subject is in focus, and the correction is performed. The drive control means 16 controls the rotation direction and rotation amount of the motor 15 according to the defocus amount d2 ′.

The determination result of the subject movement determination means 13 is sent to the control means 11. The control means 11 drives the second sensor 10 in order to shorten the accumulation time when the subject is moving, and drives the first sensor 9 when the subject is stationary.

FIG. 4 shows the control means 11 and the focus detection calculation means 1.
2 is an operation flowchart of the microcomputer 14 including the object movement determination unit 13 and the drive control unit 16. In step S100, the power is turned on, and the process proceeds to step S101. In step S101, it is determined whether or not the subject is moving according to the previous subject movement determination result. If it is not moving, the first sensor 9 having a relatively low sensitivity is selected as a drive target and the process proceeds to step S102. If it is moving, the output interval of the subject image signal from the light receiving element 8 is shortened. Therefore, the high-sensitivity second sensor 10 is selected as a drive target, and the process proceeds to step S103. In addition, power supply ON
Immediately after and at the time when the defocus amount is detected only once, there is no previous subject movement determination result, and therefore, the process proceeds unconditionally from step S101 to step S102 or step S103.

The reason why the second sensor 10 having high sensitivity is selected when it is determined that the object is moving is that the charge accumulation time is shortened and the defocus amount calculation time interval is shortened. This is so that the image plane moving speed accurately reflects the temporal change of the image plane. The reason why the first sensor 9 having relatively low sensitivity is selected when it is determined that the subject is not moving is that the first sensor 9 has a finer pixel pitch and a smaller pixel height than the second sensor 10. This is to improve the detection capability for a fine subject. That is, when high responsiveness is required to detect the image plane moving speed, the second sensor 10 is selected with emphasis on responsiveness, and when responsiveness is not required, importance is attached to the fine detection capability. The sensor 9 of 1 is selected.

In step S102, the first sensor 9 is selected to perform the charge accumulation operation, and the process proceeds to step S104. In step S103, the second sensor 10 is selected to perform the charge accumulation operation, and the process proceeds to step S104. The charge accumulation time is controlled by arranging a light amount monitor element in the vicinity of the light receiving portions of the first sensor 9 and the second sensor 10 and synchronizing the light amount monitor elements of these sensors 9 and 10 in synchronization with the start of charge accumulation. It is also possible to monitor the output and terminate the charge accumulation of the sensors 9 and 10 when the monitor output reaches a predetermined level. In that case, since the sensitivities of the first sensor 9 and the second sensor 10 are different,
When driving the first sensor 9 and the second sensor 1
The predetermined level is different from that when 0 is driven. Alternatively, the current accumulation time is set so that the current output level of the first sensor 9 or the second sensor 10 becomes a predetermined value from the previous output level of the first sensor 9 or the second sensor 10 and the accumulation time. The first sensor 9 is pre-calculated before the charge accumulation and the first sensor 9
Alternatively, the charge accumulation control of the second sensor 10 may be performed.

In step S104, the first sensor 9
Alternatively, the subject image data is read from the second sensor 10. In step S105, the subject image data is processed to calculate the defocus amount. In step S106, the previous defocus amount and calculation time, the current defocus amount and calculation time, and the image plane movement amount caused by the lens drive from the previous defocus amount calculation time to the current defocus amount calculation time are calculated. The image plane moving speed is calculated by the equation (1).

In step S107, the absolute value of the calculated image plane moving speed is compared with a predetermined value. If it is equal to or larger than the predetermined value, it is determined that the subject is moving, and if it is equal to or smaller than the predetermined value, it is determined that the subject is not moving. In step S108, if the subject is moving, the process proceeds to step S109, and if not, the process proceeds to step S110.
In step S109, the current defocus amount is corrected based on the equation (2) so that the moving subject is focused after a predetermined time. In step S110, the lens drive amount for focusing the photographing optical system 3 is calculated according to the current defocus amount or the corrected defocus amount. Immediately after the power is turned on, there is no previous defocus amount, so step S105
To step S106, step S107, step S
108, skip step S109 and skip step S1
Unconditionally advance to 10. Step S111
Then, the motor 15 is driven to move the photographing optical system 3 by the calculated lens driving amount. After this, step S1
Returning to 01, the above operation is repeated.

According to the above processing, when it is determined that the subject is moving, the second sensor 10 having a high detection sensitivity of the subject image is preferentially driven, and the defocus amount and the correction are performed based on the output thereof. Since the calculation of the amount is performed, the calculation cycle of the focus adjustment amount can be shortened, and the responsiveness of the predictive drive can be greatly improved especially at low brightness. When the subject is not moving, the first sensor 9 detects a fine subject, and high focus detection accuracy is obtained.

In the above embodiment, the second sensor 10 is selected when it is determined that the subject is moving. However, the subject brightness is further added, and it is determined that the subject is moving, and The second sensor 10 may be selected when the subject brightness decreases as the charge storage time undesirably increases. Further, in the embodiment, only the second sensor 10 is driven when the subject is moving, but the two sensors 9 and 10 are always driven and either one of the outputs is output from the microcomputer 14 according to the determination result of the subject movement. It may be taken into. The outputs of the sensors 9 and 10 may be constantly taken in by the microcomputer 14, and the output signal from either one may be selected as the calculation information of the defocus amount according to the determination result of the subject movement. In short, the output of the second sensor 10 may be selected as the output of the light receiving element 8 for calculating the defocus amount and its correction amount when the subject is moved.

In the above embodiment, the detection sensitivity of the subject image is changed according to the pixel area of the sensors 9 and 10. However, even if the focus detection optical system is provided for each sensor and the re-imaging magnification of the subject image is changed. You can change the sensitivity. An example thereof is shown in FIG. In the example of FIG. 5A, the subject image is formed on the first sensor 9A by the first focus detection optical system 7A,
A subject image is formed on the second sensor 10A by the focus detection optical system 7B. The re-imaging magnifications of the subject images by the focus detection optical systems 7A and 7B are set to different values, as shown in FIG.
As shown in (b), the pixel areas of the projected images H1 and H2 of the sensors 9A and 10A on the primary image plane X (substantially equal to the position of the visual field mask 71) on the object space side of the focus detection optical systems 7A and 7B. Is from the first sensor 9A to the second sensor 1
0A is larger. As a result, the detection sensitivity of the subject image is higher in the second sensor 10A. In addition,
In this example, the size of the pixel area of the sensors 9A and 10A themselves does not matter, and the projected image H1,
The size of the pixel area at H2 serves as a selection index for the sensors 9A and 10A.

-Second Embodiment- A second embodiment of the present invention will be described with reference to FIGS. 6 and 7.
The same parts as those in FIGS. 1 to 4 are designated by the same reference numerals,
The description is omitted. FIG. 6 is a block diagram of this embodiment.
The present embodiment is different from the first embodiment in that the light receiving element 8A is composed of a single charge storage type sensor 9, and an amplifying means 17 for amplifying a pair of subject image signal outputs of the sensor 9 is newly added. This is a point added between the sensor 9 and the focus detection calculation means 12. The configuration of the focus detection optical system 7 is the same as that of FIG. 2, and the sensor 9 includes a pair of light receiving portions 80 and 81.

The amplifying means 17 has a first gain and a second gain higher than the first gain, and based on a control signal from the control means 11A, either the first gain or the second gain. Select. The determination result of the subject movement determination means 13 is sent to the control means 11A. The control unit 11A controls the amplification unit 17 to have a second gain (high gain) in order to shorten the accumulation time of the sensor 9 when the subject is moving.
When the subject is stationary, the amplification means 1 is operated.
7 is operated at the first gain (low gain).

FIG. 6 is an operation flowchart of the microcomputer 14A including the control means 11A, the focus detection calculation means 12, the subject movement determination means 13, and the drive control means 16. In step S200, the power is turned on, and the process proceeds to step S201. In step S201, it is determined whether or not the subject is moving according to the previous subject movement determination result. If it has not moved, the amplification means 17 is executed in step S202.
Is set to the first gain, and if it is moving, the gain of the amplifying means 17 is set to the second gain in step S204 in order to shorten the accumulation time of the sensor.
Immediately after the power is turned on and at the time when the defocus amount is detected only once, there is no previous subject movement determination result, so in step S201 unconditionally step S20.
2 or advance to step S204.

The reason why the high gain is selected when it is determined that the object is moving is that the charge accumulation time is shortened and the defocus amount calculation time interval is shortened so that the calculated image plane moving speed is correct. This is to reflect the temporal change of the image plane. The reason why the low gain is selected when it is determined that the subject is not moving is to increase the raw output level of the subject image signal from the sensor 9 as much as possible and improve the S / N ratio. That is, when high responsiveness is required for detecting the image plane moving speed, the responsiveness is emphasized in the second
Is selected, and if the responsiveness is not required, the S / N of the subject image signal is emphasized and the first gain is selected.

In step S203, when the object image signal is amplified by the first gain, the charge accumulation time is set so that the object image signal becomes a level suitable for focus detection calculation, and the sensor 9 is caused to perform the charge accumulation operation. It proceeds to step S206. In step S205, when the subject image signal is amplified by the second gain, the charge accumulation time is set so that the subject image signal has a level suitable for focus detection calculation (this time is shorter than the charge accumulation time determined in step S203). And
The sensor 9 is caused to perform the charge accumulation operation, and step S206
Proceed to.

The charge accumulation time is controlled by disposing a light quantity monitor element in the vicinity of the light receiving portion of the sensor 9 and monitoring the output of the light quantity monitor element in synchronization with the start of charge accumulation of the sensor 9. A method of terminating the charge accumulation of the sensor 9 when the predetermined level is reached may be used. In that case, the predetermined level is set to be different depending on the case where amplification is performed with the first gain and the second gain. Alternatively, from the previous output level Q1 of the sensor 9, the accumulation time A1, the gain G1, and the gain G0 selected this time, the current accumulation time A0 is calculated by the formula (3) so that the current output level of the sensor 9 becomes the predetermined value Q0. As described above, the charge accumulation may be calculated in advance before the charge accumulation and the charge accumulation control of the sensor 9 may be performed at the accumulation time.

[Equation 3]

In step S206, the subject image data from the amplifying means 17 is read. In step S207, the subject image data is processed to calculate the defocus amount. In step S208, the formula is calculated from the previous defocus amount and the calculation time, the current defocus amount and the calculation time, and the image plane movement amount caused by the lens driving from the previous defocus amount calculation time to the current defocus amount calculation time. The image plane moving speed is calculated by (1).

In step S209, the calculated absolute value of the moving speed of the image plane is compared with a predetermined value. If the absolute value is equal to or larger than a predetermined value, it is determined that the subject is moving, and if it is less than the predetermined value, the subject is moving. Determine that there is no. In step S210, if the subject is moving, the process proceeds to step S211, and if not, the process proceeds to step S212.
In step S211, the current defocus amount is corrected based on the equation (2) so that the moving subject is focused after a predetermined time. In step S212, the lens drive amount to be driven for focusing the photographing optical system 3 is calculated according to the current defocus amount or the corrected defocus amount. In addition,
Immediately after the power is turned on, there is no previous defocus amount, so steps S207 to S208, step S20.
9. Steps S210 and S211 are skipped and the process proceeds unconditionally to step S212. In step S213, the motor 15 is driven to move the photographing optical system 3 by the calculated lens driving amount. After that, the process returns to step S201 and the above-described operation is repeated.

According to the above processing, when it is determined that the subject is moving, the second gain of the amplifying means 17 is higher than that of the second one.
Since the gain is set to, the calculation cycle of the focus adjustment amount can be shortened, and the responsiveness of the predictive drive can be greatly improved especially at low brightness. Amplifying means 17 when the subject is not moving
Is set low, the S / N ratio of the subject image signal is improved, and high focus detection accuracy is obtained.

In the above embodiment, the second gain is selected when it is determined that the subject is moving. However, the subject brightness is further added, and it is determined that the subject is moving and the charge is changed. The second gain may be selected when the subject brightness decreases as the accumulation time undesirably increases.

-Third Embodiment- A third embodiment of the present invention will be described with reference to FIGS. The same parts as those of the first and second embodiments described above are designated by the same reference numerals and the description thereof will be omitted. FIG. 8 is a block diagram of this embodiment. In this embodiment, the light flux from the focus detection optical system 20 is
First sensor 21, second sensor 22, third sensor 2
It is guided to the light receiving element 24 having three charge storage type sensors No. 3 and No. 3.

FIG. 9 shows the focus detection optical system 20 and the light receiving element 24.
Shows the configuration of. The focus detection optical system 20 has three re-imaging optical systems corresponding to the center position of the photographing screen by the photographing optical system 3 and the three focus detection regions on the left and right thereof. That is, the focus detection optical system 20 has the openings 200a to 200a.
field mask 200 having c, and openings 200a-20
3 condenser lenses 201a-2 corresponding to 0c
01c and a total of three pairs of aperture openings 20 with the upper and lower sides as a pair
2a1, 202a2, 202b1, 202b2, 202c
A diaphragm mask 202 having 1, 202c2 and three pairs of re-imaging lenses 203a1 arranged corresponding to the diaphragm apertures,
203a2, 203b1, 203b2, 203c1, 203
c2 and.

The light-receiving element 24 includes a total of three pairs of light-receiving portions 210, 211, 220, 221, 230, which are paired up and down.
231 is provided, and the light receiving portions 210 and 211 on the left side of FIG.
In the sensor 21, the central light receiving portions 220 and 221 form the second sensor 22, and the right light receiving portions 230 and 231 form the third sensor 23. These light receiving portions are similar to those shown in FIG.
The light receiving portions forming a pair are arranged in a straight line in the direction of alignment (vertical direction in the figure). The primary image formed near the opening 200b on the optical axis by the photographing optical system 3 is a pair of secondary images on the light receiving portions 220 and 221, and the primary image formed near the opening 200a is a pair of secondary images. As the next image, the light receiving portions 210, 2
The primary image formed in the vicinity of the opening 200c on 11 is re-imaged on the light receiving portions 230 and 231 as a pair of secondary images.

Three pairs of aperture openings 202a1, 202a2,
Reference numerals 202b1, 202b2, 202c1 and 202c2 denote photographing optical system 3 by condenser lenses 201a to 201c.
Is projected onto a pair of regions 34 and 35 that are symmetric with respect to the optical axis of the surface 30 near the exit pupil. The light flux passing through these regions 34 and 35 first forms a primary image near the field mask 200. The primary image formed in the opening 200b of the field mask 200 further passes through the condenser lens 201b and the pair of aperture openings 202b1 and 202b2, and the pair of re-imaging lenses 203b1 and 203b2 allows the light receiving portion 2 of the light receiving element 24 to be received.
Formed as a pair of secondary images on 20, 221. The primary image formed in the opening 200a of the field mask 200 is further provided with a condenser lens 201a and a pair of aperture openings 2.
A pair of re-imaging lenses 203 passing through 02a1 and 202a2.
a1 and 203a2, the light receiving portions 220 and 2 of the light receiving element 24
It is formed on 21 as a pair of secondary images. Field mask 2
The primary image formed in the opening 200c of the aperture 00 is further formed by the condenser lens 201c and the pair of aperture openings 202c.
1, 202c2 through a pair of re-imaging lenses 203c1,
The light receiving portions 220, 221 of the light receiving element 24 by 203c2.
Formed as a pair of secondary images on top. The intensity distribution of the three pairs of secondary images is determined by the light receiving parts 220, 221, 210, 211, 23.
It is photoelectrically converted by 0, 231 and becomes an electrical object image signal.

As shown in FIG. 8, the subject movement discriminating means 1
The determination result of 3A is sent to the control means 11B, and the control means 1
1B indicates the first, second, and third sensors 21 according to the determination result.
Control the output operation of ˜23. That is, when the subject is moving, only the sensor that captures the moving subject is operated in order to shorten the transfer time of the subject image signal and the focus detection calculation time. The sensors 21 to 23 are operated.

The focus detection calculation means 12A includes a light receiving element 24.
When the subject signals are output from all the sensors 21 to 23, the defocus amount corresponding to the output of each sensor 21 to 23 is individually calculated and output to the subject movement determination means 13A, and the subject signal is output from any one of the sensors. Is output, only the defocus amount corresponding to this is calculated and output. The subject movement determining means 13A determines the presence or absence of the subject movement by obtaining the movement speed v12 of the subject image plane by the equation (1) as in the first embodiment. However, when the defocus amounts of the three focus detection areas are input from the focus detection calculation means 12A, the image plane moving speed v1 in each focus detection area is input.
2 is calculated, the focus detection area having the highest movement speed is recognized as the detection position of the main subject, and the presence or absence of movement of the subject is determined from the movement speed of the area. When it is determined that the subject is moving, the defocus amount of the focus detection area and the image plane moving speed v12, which are recognized as the position of the main subject, are substituted into the equation (2) to calculate the corrected defocus amount d2 ′. Information regarding the focus detection area recognized as the position of the main subject is output to the control unit 11B and used for selecting the sensors 21 to 23 described above.

FIG. 10 shows the control means 11A, the focus detection calculation means 12A, the subject movement determination means 13A, and the drive control means 1.
6 is an operation flowchart of the microcomputer 14B including the CPU 6 of FIG. In step S300, the power is turned on to perform step S300.
Proceed to 301. In step S301, it is determined whether or not the subject is moving according to the previous subject movement determination result. If not, in step S302, all the sensors 21 to 23 are selected as driving targets and charge accumulation is performed. Let it be done. When moving, in order to shorten the focus detection calculation time, only the sensor capturing the moving subject is selected as the driving target in step S303 to perform charge accumulation.
Immediately after the power is turned on and when the defocus amount is detected only once, there is no previous subject movement determination result, so in step S301 unconditionally step S30 is performed.
Make sure to proceed to 2.

When it is determined that the subject is moving as described above, the reason why the sensor capturing the moving subject is selected and the charge is accumulated is to reduce the data used for the subsequent focus detection calculation. , Transfer time of the subject image signal,
This is because the focus detection calculation time is shortened and finally the defocus amount calculation time interval is shortened so that the calculated image plane movement speed accurately reflects the temporal change of the image plane. On the other hand, the reason why the charges are accumulated in all the sensors 21 to 23 when it is determined that the subject is not moving is
This is because when the demand for responsiveness is low, focus detection is performed at a plurality of positions within the screen, and a final result is output based on the result, so that the main subject is reliably captured. That is, when high responsiveness is required for detecting the image plane moving speed, the response is emphasized and only the sensor capturing the moving subject is operated, and when the responsiveness is not required, the main subject is surely confirmed. All sensors will be activated to capture.

In step S304, all sensors 21 ...
23 or object image data is read from a sensor capturing a moving object. In step S305, the subject image data is processed to calculate the defocus amount. In step S306, the formula is calculated from the previous defocus amount and the calculation time, the current defocus amount and the calculation time, and the image plane movement amount caused by the lens drive from the previous defocus amount calculation time to the current defocus amount calculation time. The image plane moving speed is calculated by (1). Here, as described above, when charges are accumulated in all the sensors 21 to 23, three image plane moving speeds corresponding to the data of the first, second, and third sensors are calculated. The largest image plane movement speed is used for the determination information of the presence / absence of subject movement, which will be described later. Also,
We certify that the sensor with the maximum image plane moving speed is the one that captures the moving subject.

In step S307, the calculated absolute value of the moving speed of the image plane is compared with a predetermined value. If the absolute value is greater than or equal to a predetermined value, it is determined that the subject is moving. If it is less than the predetermined value, the subject is moving. Determine that there is no. In step S308, if the subject is moving, the process proceeds to step S309, and if not, the process proceeds to step S310.
In step S309, the current defocus amount is corrected so that the moving subject is focused after a predetermined time based on the equation (2). In step S310, the lens drive amount to be driven in order to focus the photographing optical system 3 is calculated according to the current defocus amount or the corrected defocus amount. Immediately after the power is turned on, there is no previous defocus amount, so steps S305 to S306, step S307,
Steps S308 and S309 are skipped and the process proceeds unconditionally to step S310. In step S311, the motor 15 is driven to move the photographing optical system 3 by the calculated lens driving amount. After that, the process returns to step S301 and the above-described operation is repeated.

According to the above processing, when it is determined that the subject is moving, only the sensor that captures the moving subject is driven, and the defocus amount and the correction amount are calculated based on the output thereof. It is possible to shorten the time required for the calculation process during the predictive driving to shorten the calculation cycle of the focus adjustment amount, and greatly improve the responsiveness of the predictive driving. When the subject is not moving, the main subject is specified based on the outputs of all the sensors 21 to 23 and focus adjustment is performed, so that high focus detection accuracy can be obtained.

In the above embodiment, when the subject is moving, only the sensor capturing the moving subject is selected from the three sensors 21 to 23, but only the second sensor 22 used for focus detection in the center of the screen is selected. When the subject is moving, only the second sensor 22 is operated, and when the subject is stationary, all the sensors 21 are detected.
~ 23 may be operated.

In the above embodiment, the sensor capturing the moving subject is selected from the three sensors 21 to 23 when the subject is moving. However, the two sensors corresponding to the cross-shaped focus detection area are selected. In the case of performing the focus detection with, only one of the sensors may be operated when the subject is moving.

FIG. 11 shows the structures of the focus detection optical system 40 and the light receiving element 41 when focus detection is performed in the cross-shaped focus detection area. The focus detection optical system 40 has a cross-shaped opening 400.
a field mask 400 having a and a condenser lens 4
01, and the aperture opening 402 that is a pair of top, bottom, left, and right.
A stop mask 402 having h1, 402h2, 402v1, 402v2 and re-imaging lenses 403h1, 403h2, 403v1, 403v2 corresponding to these stop openings are provided. The light receiving element 41 includes a pair of light receiving portions 420 and 421 arranged in the left-right direction and a pair of light receiving portions 43 arranged in the vertical direction.
0, 431, the light receiving units 420, 421 form the first sensor 42, and the light receiving units 430, 431 form the second sensor 43. The primary images formed by the taking optical system 3 in the vicinity of the opening on the optical axis are re-imaged as two pairs of secondary images on the light receiving portion.

A pair of aperture openings 402h arranged in the left-right direction
1, 402h2 is shown in FIG. 11 by the condenser lens 401.
As described above, a pair of aperture openings 402v1 and 402v2 are projected onto a pair of regions 31 and 32 symmetrical with respect to the optical axis of the surface 30 near the exit pupil of the photographing optical system 3, and the remaining pair of aperture openings 402v1 and 402v2 are formed by the condenser lens 401. It is projected on a pair of regions 34 and 35 that are symmetrical with respect to the optical axis of the surface 30 near the exit pupil.
The light flux passing through these areas first forms a primary image near the field mask 400. Opening 400 of field mask 400
The primary image formed on a is further condensed by the condenser lens 40.
1, aperture openings 402h1, 402h2, 402v1, 4
02v2, re-imaging lenses 403h1, 403h2,
The light receiving section 42 of the light receiving element 41 by 403v1 and 403v2
Formed on 0, 421, 430, 431 as a total of two pairs of secondary images, each of which is a pair of top, bottom, left and right. The intensity distribution of the secondary image is determined by the light receiving parts 420, 421, 430, 43.
Photoelectric conversion is performed at 1 to form an electrical subject image signal.

Also in the example of FIG. 11, when the subject moves, the first sensor 42 or the second sensor 42 that captures the moving subject is used.
When the sensor 43 is driven and both the first sensor 42 and the second sensor 43 are driven when the subject is not moving, the same effect as the third embodiment of FIGS. 8 to 10 can be obtained.

In the above-described embodiment, the sensor capturing the moving subject is selected from the plurality of sensors when the subject is moving. However, when the subject is moving, a predetermined specific sensor (for example, a screen Only the central focus detection sensor) may be operated. Of the plurality of sensors, a sensor having a relatively short storage time, that is, a sensor detecting a high-luminance subject may be selectively operated. In this case, if the distance to the subject is small and the moving subject is captured in all of the plurality of detection areas, the charge accumulation time is shortened and the response of the prediction drive is improved. In the embodiment, the sensor is selected regardless of the subject brightness, but the response of the predictive drive on the high brightness side does not pose a problem, and the response of the predictive drive decreases due to the increase in the charge storage time on the low brightness side. When the problem occurs, the sensor may be selected only when the luminance is low, and the increase in the charge storage time may be offset by the reduction in the calculation processing time. Even when focus detection is performed with a single sensor, in order to shorten the focus detection calculation time, the focus detection area may be reduced to improve the responsiveness when the subject is moving.

In the processing of FIGS. 4, 7 and 10 described above, when it is determined that the object is moving, the lens drive amount is calculated after correcting the defocus amount by the equation (2). After calculating the lens drive amount first, the calculated value may be corrected according to the moving speed of the subject image,
In short, the calculation procedure does not matter as long as the adjustment amount of the focus position of the photographing optical system is corrected when the subject is moving.

In the correspondence between the above embodiment and the claims,
The photographing optical system 3 is the photographing optical system and the focus detection optical systems 7 and 7A.
7B is the focus detection optical system according to any one of claims 1 to 7, the light receiving elements 8 and 8A are the light receiving means according to any one of claims 1 to 7, and the focus detection calculation means 12 is the focus detection calculation means according to any one of claims 1 to 7 The movement determination means 13 is the subject movement determination means of claims 1 to 7, the drive control means 16 and the motor 15 are the focus control means, the first sensors 9 and 9A are the first sensors of the light receiving means, and the second sensor is the second sensor. The sensors 10 and 10A are the second light receiving means.
5. The first focus detection optical system according to claim 4, wherein the control means 11 is the light receiving control means, the amplification means 17 is the sensitivity switching means, the control means 11A is the sensitivity control means, and the first focus detection optical system 7A is the sensor of FIG. The second focus detection optical system 7B is the second focus detection optical system of claim 4, the first sensor 9A is the first sensor of claim 4, and the second sensor 10A is the system of claim 4. Constitutes the second sensor of. Further, the focus detection optical system 20 is the focus detection optical system according to claims 8 to 12, the light receiving element 24 is the light receiving means according to claims 8 to 12, and the focus detection calculation means 12A is the focus detection calculation means according to claims 8 to 12. The subject movement determining means 13A corresponds to the subject movement determining means according to claims 8 to 12, and is the first sensor 21, the second sensor 22, and the third sensor.
The sensor 23 constitutes a plurality of sensors according to claims 8 to 12, and the subject movement determination means 13A and the control means 11B constitute a focus detection area selection means.

[0061]

As described above, in the invention according to claim 1, the output of the second sensor, which has a high detection sensitivity of the subject image when the subject is moving, is selected as the output of the light receiving means. Even when the brightness is low, the object image can be detected quickly and the image plane moving speed can be detected with high accuracy, and even when the object speed changes suddenly, it is possible to follow the response without delay. In the invention according to claim 6, since the object image detection sensitivity of the light receiving means is switched to a higher side when the object is moving, the object image can be quickly detected and the image plane can be accurately displayed even at low brightness. The moving speed can be detected, and it is possible to follow up without a response delay even when the subject speed changes suddenly. In the invention according to claim 8, when the subject is moving, only the output of the specific sensor of the light receiving means is selected as the output of the light receiving means, the amount of data from the light receiving means is reduced, and the time required for the arithmetic processing is shortened. Therefore, the image plane moving speed can be detected with high accuracy, and it is possible to follow up without a response delay even when the subject speed suddenly changes.

[Brief description of drawings]

FIG. 1 is a block diagram of a first embodiment of the present invention.

FIG. 2 is a perspective view showing a configuration of a focus detection optical system of Example 1. FIG.

FIG. 3 is a plan view of the light receiving element of the first embodiment.

FIG. 4 is an operation flowchart of the first embodiment.

5A and 5B are diagrams showing a modified example of the first embodiment, in which FIG. 5A is a block diagram of a modified portion, and FIG. 5B is a diagram showing a projected image of a light receiving element on the object space side of the focus detection optical system.

FIG. 6 is a block diagram of a second embodiment of the present invention.

FIG. 7 is an operation flowchart of the second embodiment.

FIG. 8 is a block diagram of a third embodiment of the present invention.

FIG. 9 is a perspective view showing the configuration of a focus detection optical system according to a third embodiment.

FIG. 10 is an operation flowchart of the third embodiment.

FIG. 11 is a perspective view showing a modified example of the focus detection optical system of the third embodiment.

FIG. 12 is an explanatory diagram of a basic principle of predictive driving.

[Explanation of symbols]

 1 Body 2 Lens 3 Photographic Optical System 4 Main Mirror 5 Sub Mirror 6 Finder 7,20 Focus Detection Optical System 7A 1st Focus Detection Optical System 7B 2nd Focus Detection Optical System 8, 8A, 24 Light Receiving Element 9 First Sensor 10 second sensor 11, 11A, 11B control means 12, 12A focus detection calculation means 13, 13A subject movement determination means 14, 14A, 14B microcomputer 15 motor 16 drive control means 17 amplification means 21 first sensor 22 second sensor 23 3rd sensor

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI Technical display location H04N 5/232 M 9119-2K G03B 3/00 A

Claims (12)

[Claims] 1. A photographing optical system for forming a subject image on a planned focal plane, a focus detecting optical system for detecting a focus state of the photographing optical system, and a subject formed by the focus detecting optical system. A light receiving unit for receiving an image; a focus detection calculating unit for calculating a defocus amount of the image plane of the photographing optical system with respect to the planned focal plane based on an output of the light receiving unit; Subject movement determination means for determining whether or not the subject is moving based on the plurality of defocus amounts calculated in step A, and adjusting the focus position of the photographing optical system based on the defocus amount, and When it is determined that the subject is moving, a focus control unit that corrects the adjustment amount of the focus position of the photographing optical system so as to reduce the focus error due to the movement of the subject is provided. In the automatic focusing camera, a first sensor and a second sensor having a higher detection sensitivity of the subject image than the first sensor are arranged in the light receiving means, and the subject movement determination means causes the subject to move. An automatic focusing camera, characterized by further comprising a light receiving control means for selecting the output of the second sensor as the output of the light receiving means when it is determined that the camera is moving. 2. The automatic focusing camera according to claim 1, wherein the first sensor and the second sensor are charge accumulation sensors that accumulate charges according to the amount of received light, and the subject images of the same brightness. When the light is received for a certain period of time
And the amount of charge stored in the second sensor is
An automatic focusing camera characterized in that the number of the second sensors is larger than that of the first sensors. 3. The automatic focusing camera according to claim 1, wherein the pixel area of the second sensor is larger than the pixel area of the first sensor. 4. The automatic focus adjustment camera according to claim 1, wherein the focus detection optical system is a first focus detection optical system for forming a subject image on the first sensor. System and the second
A second focus detection optical system for forming a subject image on the sensor, and the first focus detection optical system and the second focus detection optical system including the first sensor and the second sensor. An automatic focusing camera characterized in that the pixel area of the second sensor is larger than that of the first sensor when projected onto the same plane on the object space side of the system. 5. The automatic focusing camera according to claim 1, wherein the light-reception control unit determines that the subject is moving by the subject movement determination unit and the subject image. The automatic focus adjustment camera is characterized in that the output of the second sensor is selected as the output of the light receiving means when the brightness of the image is below a predetermined position. 6. A photographing optical system for forming a subject image on a planned focal plane, a focus detecting optical system for detecting a focus state of the photographing optical system, and a subject formed by the focus detecting optical system. A light receiving unit for receiving an image; a focus detection calculating unit for calculating a defocus amount of the image plane of the photographing optical system with respect to the planned focal plane based on an output of the light receiving unit; Subject movement determination means for determining whether or not the subject is moving based on the plurality of defocus amounts calculated in step A, and adjusting the focus position of the photographing optical system based on the defocus amount, and And a focus control unit that corrects the adjustment amount of the focus position of the photographing optical system so as to reduce the focus error due to the movement of the subject. In the automatic focusing camera, the sensitivity switching means capable of switching the detection sensitivity of the subject image by the light receiving means into at least two steps, high and low, and the subject movement determining means determines that the subject is moving, An automatic focusing camera, comprising: sensitivity control means for controlling the sensitivity switching means so that the detection sensitivity of the light receiving means is increased. 7. The automatic focusing camera according to claim 6, wherein the sensitivity control unit determines by the subject movement determination unit that the subject is moving, and the brightness of the subject image is equal to or less than a predetermined value. At this time, the automatic focus adjustment camera is characterized in that the sensitivity switching means is controlled so that the detection sensitivity of the light receiving means becomes high. 8. A photographing optical system for forming a subject image on a planned focal plane, and focus detection for detecting a focus state in a plurality of focus detection areas set in a photographing screen by the photographing optical system. An optical system, a light receiving means having a plurality of sensors for receiving a plurality of subject images formed by the focus detection optical system separately for each focus detection area, and the planned focal plane based on the output of the light receiving means. A focus detection calculation means for calculating the defocus amount of the image plane of the photographing optical system with respect to, and whether or not the subject is moving based on a plurality of defocus amounts calculated in time series by the focus detection calculation means. Subject movement determining means for determining whether the subject is moving, while adjusting the focus position of the photographing optical system based on the defocus amount, and determining that the subject is moving, In an automatic focusing camera including a focus control unit that corrects an adjustment amount of a focus position of the photographing optical system so as to reduce a focus error due to movement, the subject is moving by the subject movement determination unit. When it is determined that the focus detection area selecting means for selecting only the output of the sensor corresponding to a specific focus detection area among the plurality of sensors included in the light receiving means as the output of the light receiving means is provided. An autofocus camera that does. 9. The automatic focusing camera according to claim 8, wherein the plurality of sensors are charge storage sensors that store electric charges according to the amount of received light. 10. The automatic focus adjustment camera according to claim 8 or 9, wherein the focus detection area selection means outputs a sensor corresponding to a focus detection area determined by the subject movement determination means as a subject moving. Is selected as the output of the light receiving means. 11. The automatic focusing camera according to claim 8, wherein the plurality of focus detection areas partially overlap with each other and extend in different directions in a photographing screen of the photographing optical system. An automatic focusing camera characterized by: 12. The automatic focus adjustment camera according to claim 11, wherein the focus detection area selection means selects an output of a sensor corresponding to a high-brightness focus detection area of the focus detection area as an output of the light receiving means. An automatic focusing camera characterized by: