JP2006106429A - Camera - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a camera capable of precisely exerting focus control regardless of the direction of an image. <P>SOLUTION: The camera includes: a first light-receiving sensor 112-1 and a second light-receiving sensor 112-2, each of which has a series of light-receiving elements for photo-electrically converting an image formed by a luminous flux transmitted from a photographic optical system 101a; a control means 118 for exerting focus control for the photographic optical system based upon outputs from the first and second light-receiving sensors; and a detecting means 118a for detecting the direction of the image relative to each series of light-receiving elements. The control means exerts focus control matching the detected direction of the image. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a camera that performs focus control of a photographing optical system based on outputs of first and second light receiving sensors.

Some conventional single-lens reflex cameras detect the focus state of the photographing optical system by guiding the light beam from the photographing optical system to a focus detection unit provided in the camera body. In the focus detection unit, the light beam guided from the photographing optical system is divided into a plurality of light beams, each divided light beam is guided to a plurality of line sensors on the light receiving unit, and focus detection is performed based on output signals of these line sensors. (For example, refer to Patent Documents 1 and 2).
Japanese Patent Laid-Open No. 5-107466 (paragraph numbers 0041 to 0044, FIG. 1, etc.) JP-A-5-142465 (paragraph numbers 0030 and 0031, FIG. 1 etc.)

  As shown in FIGS. 9B and 10B, in the conventional light receiving unit 141, the two line sensors may not be located on the same line due to a manufacturing error or the like. 141-1 may be shifted by d1 with respect to the second line sensor 141-2. Here, as shown in FIGS. 9A and 10A, the line sensors 141-1 and 141-2 are provided on the focusing screen 103 in the camera, that is, provided in the subject observation screen. This is used to perform focus detection on the image 5 positioned in the focus detection frame 103-1.

  On the other hand, in the camera including the light receiving unit 141 described above, focus adjustment is performed using a chart perpendicular to the longitudinal direction of the line sensors 141-1 and 141-2 in the manufacturing stage.

  Here, when the subject images 5-1 and 5-2 are orthogonal to the longitudinal direction of the line sensors 141-1 and 141-2, and the photographing optical system is in focus, The peaks of the signals output from the line sensors 141-1 and 141-2 coincide as shown in FIG. 9C.

  However, when the subject images 5-1 and 5-2 are inclined with respect to the longitudinal direction of the line sensors 141-1 and 141-2 as shown in FIG. The output signals of the line sensors 141-1 and 141-2 are shifted by the amount of the shift of the 141-1 and 141-2. That is, although the subject is in focus, as shown in FIG. 10C, the peaks of the output signals of the line sensors 141-1 and 141-2 are shifted by d2, resulting in focusing. There is a risk that it will be judged that is not correct.

  Here, if the two line sensors are arranged on the same line, even if the subject image is oblique with respect to the line sensor, the output signal of the line sensor does not shift. However, in this case, components such as the secondary imaging lens arranged in the focus detection unit have to be arranged with high positional accuracy, which is difficult to increase costs.

  An object of the present invention is to provide a camera that can accurately perform focus control of a photographing optical system regardless of the orientation of a subject image.

  The camera of the present invention includes a first light receiving sensor and a second light receiving sensor each having a light receiving element array that photoelectrically converts an image formed by a light beam from a photographing optical system, and the first and second light receiving sensors. Control means for performing focus control of the imaging optical system based on the output of the image sensor, and detection means for detecting the orientation of the image with respect to the light receiving element array, the control means in accordance with the orientation of the detected image. The focus control is performed accordingly.

  According to the present invention, accurate focus control can be performed regardless of the orientation of an image.

  Examples of the present invention will be described below.

  FIG. 1 is a schematic diagram showing the configuration of a camera system that is Embodiment 1 of the present invention. The camera system of the present embodiment includes a camera body 100 and an interchangeable lens 101 attached to the camera body 100. The camera system of this embodiment detects the focus state of the photographing optical system by a focus detection operation using a phase difference detection method. Hereinafter, the configuration of the camera system of the present embodiment will be described.

  Reference numeral 101 a denotes a photographic lens arranged in the interchangeable lens 101. The taking lens 101a includes a focusing lens that moves in the optical axis L direction to adjust the focus of the taking optical system.

  A lens CPU 101b controls the driving of the focusing lens through the lens driving circuit 101c. The lens CPU 101b can communicate with the camera CPU (control means) 118 in the camera body 100 via the lens side communication contact 101d and the camera side communication contact 119.

  Reference numeral 102 denotes a semi-transparent main mirror, which can advance and retreat with respect to the photographing optical path. When the main mirror 102 is located in the photographing optical path, a part of the subject light flux transmitted through the photographing lens 101a is reflected by the main mirror 102 and guided to the focusing screen 103 side. The remaining light flux passes through the main mirror 102, is reflected by the sub mirror 106, and is guided to the focus detection unit 108. Here, the sub mirror 106 can advance and retreat with respect to the photographing optical path together with the main mirror 102.

  The subject image reflected by the main mirror 102 and formed on the focusing screen 103 can be observed through the pentaprism 104 and the eyepiece 105.

  On the other hand, when the main mirror 102 and the sub mirror 106 are retracted from the photographing optical path, the subject light flux that has passed through the photographing lens 101a is directed toward the image plane side. Then, by driving a shutter (not shown), the subject luminous flux reaches the image sensor 107, and an imaging operation is performed.

  Next, the configuration of the focus detection unit 108 will be described with reference to FIGS. 1 and 2. FIG. 2 is a diagram illustrating the configuration of the focus detection unit 108 and the relationship between the photographing lens 101a and the focus detection unit 108.

  Reference numeral 109 denotes a field mask, which is disposed in the vicinity of a predetermined imaging plane of the photographing lens 101a, that is, a plane conjugate with the imaging plane of the imaging element 107. Reference numeral 110 denotes a field lens, which is disposed in the vicinity of the planned imaging plane. Reference numeral 116 denotes a reflection mirror that reflects a subject light flux that has passed through the field lens 110 in a direction in which a light receiving unit 112 described later is positioned.

  A diaphragm 113 has two openings 113-1 and 113-2 as shown in FIG. 2. The two openings 113-1 and 113-2 divide the subject light beam reflected by the reflection mirror 116 into two light beams. Reference numeral 111 denotes a secondary imaging lens having two lens portions, and a first line sensor (first light receiving sensor) 112-1 and a pair of line sensors 112- described later for two light beams divided by the stop 113. 2 to form an image. Here, the pair of line sensors 112-2 includes second and third line sensors 112-21 and 112-22, as will be described later.

  The light receiving unit 112 includes a first line sensor 112-1 and a pair of line sensors 112-2, and outputs signals corresponding to the amounts of light received by the line sensors 112-1 and 112-2, respectively.

  In FIG. 2, reference numeral 114 denotes an exit pupil of the photographing lens 101 a, and the exit pupil 114 includes regions 114-1 and 114-2 through which two light beams divided by the stop 113 pass.

  The field lens 110 has an effect of forming an image of the light flux passing through the openings 113-1 and 113-2 of the stop 113 in the vicinity of the regions 114-1 and 114-2 in the exit pupil 114 of the photographing lens 101a. Have. As a result, the light fluxes that have passed through the regions 114-1 and 114-2 of the exit pupil 114 are received by the first line sensor 112-1 and the pair of line sensors 112-2, and signals output by the line sensors. Indicates a light amount distribution related to the subject image.

  In the present embodiment, when the imaging position of the subject luminous flux by the photographing lens 101a is located on the subject side with respect to the imaging surface, that is, in the case of the front pin, output from the line sensors 112-1 and 112-2. As shown in FIG. 2B, the peaks of the signals to be processed are close to each other. In addition, when the imaging position of the subject luminous flux by the photographing lens 101a is located on the opposite side of the subject side with respect to the imaging surface, that is, in the case of the rear pin, the two line sensors 112-1, 112- As shown in FIG. 2C, the peaks of the signals output from 2 are separated from each other.

  In the case of the front pin and the rear pin described above, the peaks of the output signals of the first and second line sensors are shifted. Further, when the photographing optical system is in focus, the peaks of the output signals of the first and second line sensors substantially match.

  The deviations of the output signals of the line sensors 112-1 and 112-2 indicate a deviation amount (defocus amount) and a deviation direction with respect to the in-focus position. For this reason, the camera CPU 118 can obtain a shift amount and a shift direction with respect to the in-focus position by performing predetermined arithmetic processing on the outputs of the line sensors 112-1 and 112-2. Then, the camera CPU 118 can bring the photographing optical system into a focused state by controlling the driving of the focus lens in the photographing lens 101a based on the amount of deviation and the direction of deviation.

  Next, the structure of the light receiving unit 112 in this embodiment will be described with reference to FIGS. 4A and 5A, a focus detection frame 103-1 is formed on the focusing screen 103, and an image 5 is formed in the focus detection frame 103-1. 4B and 5B are front views of the light receiving unit 112. FIG.

  As shown in FIGS. 4B and 5B, the light receiving unit 112 is formed with first to third line sensors 112-1, 112-21, 112-22. Here, the second line sensor (first light receiving element array) 112-21 and the third line sensor (second light receiving element array) 112-22 are arranged substantially in parallel. The second line sensor 112-21 is arranged in a state shifted from the first line sensor 112-1 by the distance d1 in the width direction of the line sensor (lateral direction in the drawing).

  FIG. 4B shows an image 5 formed on the focusing screen 103, that is, two images 5-1 and 5-2 reaching the light receiving unit 112, when the photographing optical system is in focus. As shown, when the line sensors 112-1 and 112-22 are substantially orthogonal to the longitudinal direction, the peaks of the output signals of the first and second line sensors 112-1 and 112-21 are conventional ( Similar to FIG. 9 (C)), they substantially coincide with each other. Further, the peaks of the output signals of the second and third line sensors 112-21 and 112-22 substantially coincide as shown in FIG.

  On the other hand, when the imaging optical system is in focus, the image 5 formed on the focusing screen 103, that is, two images 5-1 and 5-2 reaching the light receiving unit 112 are shown in FIG. ), When tilted with respect to the longitudinal direction of the first and second line sensors 112-1 and 112-21, the peak of the output signal of the line sensors 112-1 and 112-21 is As in the prior art (FIG. 10C), it is shifted by d2. Further, the peaks of the output signals of the second and third line sensors 112-21 and 112-22 are shifted by d3 as shown in FIG.

  Here, the shift amount d3 varies depending on the inclination of the images 5-1 and 5-2 with respect to the line sensors 112-1 and 112-21.

  In the present embodiment, first, the inclination angle of the image with respect to the line sensor is detected using the second and third line sensors 112-21 and 112-22 arranged substantially in parallel. That is, when the image 5-2 is inclined with respect to the longitudinal direction of the line sensor 112-21, as described above, the deviation d3 occurs in the peak of the output signal of the line sensors 112-21 and 112-22. By detecting the shift amount d3, the tilt angle of the image can be obtained.

  Then, the defocus amount of the photographic optical system calculated from the output signals of the first and second line sensors 112-1 and 112-21 is corrected according to the inclination angle of the image 5-2. Specifically, in the memory (storage means) 120 provided in the camera body 100, the inclination angle of the image 5-2 and the defocus amount correction information are stored in association with each other. Correction information corresponding to the detection result of the inclination angle of the image 5-2 is read. Then, the defocus amount is corrected using the read correction information.

  The correction information may be a different value for each camera due to a manufacturing error (d1 value) of the focus detection unit.

  In this way, by correcting the defocus amount according to the tilt of the image, the line sensor 112-generated according to the orientation of the image (the tilt with respect to the line sensor) even though the photographing optical system is in focus. Based on the deviation of the output signals of 1 and 112-22, it is possible to suppress the focus detection and to improve the focus detection accuracy.

  In actual shooting, the subject image is often tilted with respect to the longitudinal direction of the line sensor. Therefore, by correcting the defocus amount according to the tilt of the subject image as described above, Suitable focus adjustment can be performed.

  Further, by correcting the defocus amount according to the inclination of the subject image as in the present embodiment, it is only necessary to roughly perform the focus adjustment performed in the manufacturing stage, and the adjustment time can be shortened. Furthermore, extremely high positional accuracy is not required for the arrangement of the components in the focus detection unit.

  Next, the photographing operation in the camera system of the present embodiment will be described with reference to FIG.

  In step S101, it is determined whether or not SW1 is in an on state by a half-press operation of a release button provided on the camera body 100. If SW1 is in an on state, the process proceeds to step S102.

  In step S102, a focus detection operation by a phase difference detection method is performed based on the outputs of the first and second line sensors 112-1 and 112-21 in the light receiving unit 112. In step S103, the defocus amount and the shift direction are determined. Calculate.

  In step S104, it is determined whether or not the subject image is tilted with respect to the longitudinal direction of the line sensor 112-21 based on the outputs of the second and third line sensors 112-21 and 112-22. Here, when the subject image is inclined with respect to the longitudinal direction of the line sensor 112-21, the output signals of the second and third line sensors 112-21 and 112-22 are shown in FIG. As shown in FIG.

  Therefore, it is possible to determine whether or not the subject image is inclined with respect to the longitudinal direction of the line sensor 112-21 based on the output signals of the second and third line sensors 112-21 and 112-22. it can. The inclination detection of the subject image is performed by an inclination detection unit (detection means) 118a in the camera CPU 118.

  If the subject image is tilted in step S104, the process proceeds to step S105, and the defocus amount obtained in step S103 is corrected. That is, correction information corresponding to the inclination angle of the subject image detected in step S104 is read from the memory 120, and the defocus amount is corrected using the correction information.

  Thereby, even when the first and second line sensors 112-1 and 112-21 are not arranged on the same line and the subject image is inclined with respect to the line sensor, the photographing optical system is focused. Whether or not it is in a state can be accurately detected.

  In step S106, the driving amount of the focus lens is calculated based on the defocus amount obtained in step S103 or the defocus amount corrected in step S105. Then, the camera CPU 118 transmits information regarding the calculated driving amount of the focus lens to the lens CPU 101b. Accordingly, the lens CPU 101b can bring the photographing optical system into a focused state by driving the focus lens via the lens driving circuit 101c.

  Here, the focus control in the claims of the present application includes the focus detection operation, the calculation of the defocus amount, the calculation of the driving amount of the focus lens, and the transmission of the lens driving information to the lens CPU 101b.

  In step S107, it is determined whether or not SW2 is turned on by the full pressing operation of the release button. If it is turned on, the process proceeds to step S108 to perform a photographing operation. As a photographing operation in step S108, first, the image sensor 107 is exposed by retracting the main mirror 102 and the sub mirror 106 from the photographing optical path and controlling the driving of a shutter (not shown).

  The signal read from the image sensor 107 is subjected to predetermined processing by the image processing circuit 117, and then displayed as a captured image on the display unit or recorded on a recording medium.

  Next, a camera system that is Embodiment 2 of the present invention will be described. In the camera system of the present embodiment, an area sensor is used to detect a focus state in a specific area in the shooting screen.

  Hereinafter, the configuration of the camera system of the present embodiment will be described with reference to FIG. Here, the same members as those described in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  In the present embodiment, a first reflecting member 121 having a curved surface is arranged instead of the sub mirror 106 in the first embodiment. The reflecting surface of the first reflecting member 121 is constituted by a concave mirror or an ellipsoidal mirror having a light collecting property.

  When the camera system is in a non-shooting state, the main mirror 102 and the first reflecting member 121 are located in the shooting optical path. Part of the subject luminous flux that has passed through the photographic lens 101 a is reflected by the main mirror 102 and travels toward the focusing screen 103. Further, the remaining light beam is guided to the focus detection unit 127 by being transmitted through the main mirror 102 and reflected by the first reflecting member 121. The subject light flux reflected by the first reflecting member 121 forms an image on a plane conjugate with the imaging surface of the imaging element 107. Here, the first reflecting member 121 forms an image of a subject image formed on the imaging surface in a reduced state with respect to a surface conjugate with the imaging surface.

  When the camera system shifts from the non-photographing state to the photographing state, the main mirror 102 and the first reflecting member 121 are retracted from the photographing optical path.

  Next, the configuration within the focus detection unit 128 will be described.

  Reference numeral 122 denotes a second reflecting member that reflects the subject light flux from the first reflecting member 121. Reference numeral 127 denotes an infrared cut filter. A stop 123 having two openings divides the subject light beam guided from the second reflecting member 122 by the two openings into two light beams.

  Reference numeral 124 denotes a secondary imaging lens having two lens portions, which condenses two subject light beams divided by the diaphragm 123 and forms an image on two area sensors 126-1 and 126-2 described later. . The subject luminous flux that has passed through the secondary imaging lens 124 is reflected by the third reflection mirror 125 and reaches the two area sensors 126-1 and 126-2 provided in the light receiving unit 126.

  Note that the first reflecting member 121 has light condensing properties as described above, and is configured to project the light beam passing through the two openings of the diaphragm 123 in the vicinity of the exit pupil of the photographing lens 101a. Has been.

  The two openings formed in the diaphragm 123 are formed in a shape corresponding to the shape of the area sensors 126-1 and 126-2, and are arranged side by side in a direction in which the opening width is narrow. The lens portion of the secondary imaging lens 124 is provided corresponding to the position of the opening of the diaphragm 123.

  FIG. 7 is a front view of the light receiving unit 126. On the surface of the light receiving unit 126, two area sensors 126-1 and 126-2 are arranged in parallel. The area sensors 126-1 and 126-2 are sensors in which a plurality of pixels are two-dimensionally arranged.

  The subject luminous flux divided by the diaphragm 123 is received by the area sensors 126-1 and 126-2, and signals indicating the light quantity distribution regarding the subject image are output from the area sensors 126-1 and 126-2.

  In the camera system of the present embodiment, focus detection by the phase difference detection method is performed in a part of the area sensors 126-1 and 126-2, that is, an area corresponding to the focus detection area in the photographing screen.

  For example, as shown in FIG. 7, a region 126-11 indicated by hatching in the first area sensor 126-1 and a region indicated by hatching in the second area sensor 126-2 are the regions 126-11. The focus detection is performed using the region 126-21 corresponding to. That is, as in the case described in the first embodiment, the shift amount (defocus amount) and the shift direction with respect to the in-focus position are obtained based on the output signals of the region 126-11 and the region 126-21, and this calculation result is obtained. Based on this, the driving control of the focusing lens is performed.

  In the first area sensor 126-1 and the second area sensor 126-2, pixel columns corresponding to each other are not positioned on the same line due to manufacturing errors or the like, and the longitudinal direction of the area sensor (left and right in FIG. 7). (Direction).

  Here, when the subject image is substantially orthogonal to the longitudinal direction of the regions 126-11 and 126-21, the peaks of the output signals of the regions 126-11 and 126-21 are as shown in FIG. It will be almost the same as. However, when the subject image is inclined with respect to the longitudinal direction of the regions 126-11 and 126-21, as described in the first embodiment, the region 126- is used even though the photographing optical system is in focus. 11 and 126-21 of the output signal peak may shift.

  In the present embodiment, by using the region 126-22 adjacent to the region 126-21 in the second area sensor 126-2, the inclination angle of the image with respect to the region 126-21 is detected.

  That is, when focus detection is performed by the phase difference detection method using the region 126-11 in the first area sensor 126-1 and the region 126-21 in the second area sensor 126-2, the inclination in the camera CPU 118 The detection unit 118a detects the tilt angle of the image with respect to the region 126-21 based on the outputs of the two regions 126-21 and 126-21 in the second area sensor 126-2. Then, the camera CPU 118 corrects the defocus amount calculated based on the output signals of the regions 126-11 and 126-21, using the defocus amount correction information corresponding to the tilt angle of the image.

  Here, the defocus amount correction information corresponding to the tilt angle of the image may be stored in the memory in advance as in the first embodiment, or may be obtained by calculation from the tilt angle of the image.

  Further, the region used for detecting the tilt angle of the image is not limited to the region adjacent to the region 126-21 as described above, and any region may be used as long as the tilt of the image can be detected.

  The camera system of the present embodiment is different from the camera system of the first embodiment only in that an area sensor is used, and the shooting operation in the present embodiment is the same as the shooting operation (FIG. 3) described in the first embodiment. is there.

  In this embodiment, the case where two area sensors are used has been described. However, focus detection can also be performed using a line sensor and an area sensor. That is, focus detection can be performed using the line sensor and a line of sensors in the area sensor, and the inclination of the image can be detected by the area sensor. The defocus amount can be corrected according to the inclination of the image.

  Next, a camera system that is Embodiment 3 of the present invention will be described. The camera system of the present embodiment performs focus detection using a light receiving unit similar to the conventional one, i.e., a light receiving unit including two line sensors, detects the tilt of the image based on the output of the image sensor, The defocus amount is corrected based on the detection result. Hereinafter, the camera system of the present embodiment will be specifically described.

  FIG. 8 is a schematic diagram showing the configuration of the camera system of the present embodiment. Here, the same reference numerals are used for the same members as those described in the first embodiment.

  Part of the subject light flux that has passed through the photographing lens 101 a in the interchangeable lens 101 is reflected by the main mirror 102 and guided to the image sensor 107. The signal read from the image sensor 107 is subjected to predetermined processing by the image processing circuit 117 and then displayed on the display unit 132 as a captured image.

  The image displayed on the display unit 132 is guided to the eyepiece lens 105 through the reflecting member 133. Thereby, the photographer can observe the subject image via the eyepiece lens 105.

  On the other hand, the remaining light flux of the subject light flux is guided to the focus detection unit 130 by being transmitted through the main mirror 102 and reflected by the sub mirror 106.

  The focus detection unit 130 is different from the focus detection unit 108 in the first embodiment only in the configuration of the light receiving unit, and the other configurations are the same. That is, in the first embodiment, a third line sensor is provided that is disposed substantially parallel to one of the two line sensors. In the light receiving unit of the present embodiment, The third line sensor is not arranged.

  In the configuration of the light receiving unit of the present embodiment, when an image substantially orthogonal to the longitudinal direction of the line sensor reaches the light receiving unit, if the imaging optical system is in focus, the peak of the output signals of the two line sensors Substantially match. However, when the image is inclined with respect to the longitudinal direction of the line sensors, the peaks of the output signals of the two line sensors are shifted as in the conventional case, even though the photographing optical system is in focus. It may end up.

  Therefore, in this embodiment, the inclination of the image is detected based on the output of the image sensor 107, and the defocus amount is corrected according to the detection result. That is, the tilt detection unit 118a in the camera CPU 118 detects the tilt of the subject image with respect to the longitudinal direction of the line sensor based on the output of the image sensor 107 processed by the image processing circuit 117.

  When detecting the tilt of the image using the output of the image sensor 107, the output of the area corresponding to the line sensor of the light receiving unit 131 in the image area of the image sensor 107 and the area adjacent to the above area, for example. Based on the signal, it can be detected whether the image is tilted.

  When the image is inclined with respect to the longitudinal direction of the line sensor, the defocus amount is corrected based on correction information corresponding to the inclination angle. Here, the correction information may be stored in the memory in advance as described in the first embodiment, or may be obtained by calculation from the tilt angle of the image.

  Note that the shooting operation of the camera system of the present embodiment is different from that of the first embodiment in the above-described points, and the other operations are the same as the shooting operation of the first embodiment (FIG. 3).

  In this embodiment, an image sensor 107 is disposed on the upper side of the camera body with respect to the main mirror 102, and reflected light from the main mirror 102 is guided to the image sensor 107. Here, the configuration in the camera body can be configured as described below.

  In the configuration inside the camera body shown in FIG. 1, when the main mirror and the sub mirror are configured to be movable independently and focus detection is performed by a focus detection unit (corresponding to the focus detection unit 130) having two line sensors. The sub-mirror can be retracted from the photographing optical path, and the main mirror can be set to the same position as the sub-mirror in the photographing optical path. In this case, part of the subject light beam reflected by the main mirror is guided to the focus detection unit, and the other light beam passes through the main mirror and travels toward the image sensor.

  Thereby, the inclination of the subject image can be detected based on the output of the image sensor, and the defocus amount can be corrected based on the detection result.

  In each of the above-described embodiments, the case where the defocus amount is corrected according to the inclination of the subject image has been described. However, the signal output from a part of the line sensor or the area sensor according to the inclination of the subject image is described. Then, correction (that is, deviation correction of the output peak) may be performed. Further, the driving amount of the focusing lens may be obtained from the defocus amount, and the driving amount may be corrected according to the inclination of the subject image.

1 is a diagram illustrating a configuration of a camera system that is Embodiment 1 of the present invention. FIG. FIG. 3 is a diagram illustrating a configuration of a focus detection unit according to Embodiment 1 and a relationship between the focus detection unit and a photographing lens. FIG. 3 is a diagram illustrating a shooting operation in the camera system according to the first embodiment. FIG. 3 is a diagram illustrating focus detection when the subject image is substantially orthogonal to the line sensor in the first embodiment. FIG. 3 is a diagram illustrating focus detection when the subject image is tilted with respect to the line sensor in the first embodiment. FIG. 6 is a diagram illustrating a configuration of a camera system that is Embodiment 2 of the present invention. FIG. 6 is a front view of a light receiving unit in a focus detection unit in Embodiment 2. FIG. 6 is a diagram illustrating a configuration of a camera system that is Embodiment 3 of the present invention. FIG. 6 is a diagram for explaining focus detection when a subject image is substantially orthogonal to a line sensor in the related art. FIG. 8 is a diagram for explaining focus detection when a subject image is inclined with respect to a line sensor in the related art.

Explanation of symbols

101a: photographing lens 101b: lens CPU
108: focus detection unit 112: light receiving unit 112-1: first line sensor 112-2: second and third line sensors 118: camera CPU

Claims (6)

A first light-receiving sensor and a second light-receiving sensor each having a light-receiving element array for photoelectrically converting an image formed by a light beam from a photographing optical system;
Control means for performing focus control of the photographing optical system based on outputs from the first and second light receiving sensors;
Detecting means for detecting the orientation of the image with respect to the light receiving element array;
The camera according to claim 1, wherein the control means performs the focus control in accordance with a direction of the detected image. Storage means for storing correction information corresponding to the orientation of the image;
The said control means performs the said focus control based on the said correction information according to the direction of the detected image, and the output from the said 1st and 2nd light receiving sensor, The said control means performs the said focus control. Camera.   The control means uses the correction information for defocus information of the photographing optical system obtained based on outputs from the first and second light receiving sensors or in-focus position information calculated from the defocus information. The camera according to claim 2, wherein correction is performed. The detection means includes a first light receiving element array constituting at least one of the first and second light receiving sensors, and a second light receiving element disposed substantially parallel to the first light receiving element array. The camera according to claim 1, wherein the orientation of the image is detected using an element array. At least one of the first and second light receiving sensors is an area light receiving sensor having a plurality of light receiving element arrays,
4. The camera according to claim 1, wherein the detection unit detects the orientation of the image based on an output from the area light receiving sensor. 5. An image sensor that photoelectrically converts an image formed by a light beam from the imaging optical system and outputs a signal for generating a captured image;
The camera according to claim 1, wherein the detection unit detects the orientation of the image based on a signal from the image sensor.

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