JP2015102740A - Imaging device and adjustment method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem in which, when a location deviation in an imaging plane exists between locations of an element having something to do with subject light and an image pickup element, an imaging device is unable to perform processing with consideration of the location deviation.SOLUTION: An imaging device comprises: an image pickup element that photographs a subject by light passing through an optical system; a detection element that is provided at a location different from that of the image pickup element, and detects a focus state of the optical system; and a location information recording unit that records information indicative of a relative location deviation between a corresponding location of the detection element in the imaging plane of the image pickup element and a location of the image pickup element. The imaging device comprises: an image pickup element that photographs the subject by the light passing through the optical system; a display element that displays information by overlapping on an optical image formed by the light passing through the optical system; and a location information recording unit that records information indicative of a relative location deviation between a corresponding location of the display element in the imaging plane of the image pickup element and the location of the image pickup element.

Description

  The present invention relates to an imaging apparatus and an adjustment method.

A method for adjusting a distance measuring apparatus is known (see, for example, Patent Document 1 and Patent Document 2).
[Prior art documents]
[Patent Literature]
[Patent Document 1] JP-A-11-142939 [Patent Document 2] JP-A-11-183790

  In an imaging apparatus in which a detection element for detecting a focus state of an optical system is provided at a position different from the imaging element, a relative positional shift between the corresponding position of the detection element and the position of the imaging element in the imaging plane of the imaging element May exist. In an imaging apparatus having a display element that displays information superimposed on an optical image formed by light that has passed through an optical system, the relative position between the corresponding position of the display element and the position of the imaging element in the imaging surface of the imaging element There may be a positional misalignment. As described above, in an imaging apparatus in which an element related to subject light is provided separately from the imaging element, when there is a positional deviation in the imaging plane between the position of the imaging element and the element, the positional deviation related to the imaging apparatus is considered. There has been a problem that the processing cannot be performed.

  In the first aspect, an imaging device includes an imaging element that images a subject with light that has passed through an optical system, a detection element that is provided at a position different from the imaging element, and that detects a focus state of the optical system, and an imaging element A position information recording unit that records information indicating a relative positional deviation between the corresponding position of the detection element and the position of the imaging element in the imaging plane.

  In the second aspect, the imaging device includes an imaging element that images a subject with light that has passed through the optical system, a display element that displays information superimposed on an optical image formed by the light that has passed through the optical system, A position information recording unit configured to record information indicating a relative position shift between the corresponding position of the display element and the position of the image pickup element in the image pickup surface of the image pickup element;

  According to a third aspect, there is provided an adjustment method for an imaging apparatus that includes an imaging element that images a subject with light that has passed through an optical system, and a detection element that is provided at a position different from the imaging element and detects a focus state of the optical system. A plurality of light-receiving elements included in the detection element and a plurality of light-receiving elements included in the imaging element receive the measurement light; and a position of the light-receiving element that detected the measurement light among the plurality of light-receiving elements included in the detection element; Based on the position of the light receiving element that has detected the measurement light among the plurality of light receiving elements included in the image sensor, the relative positional deviation between the corresponding position of the detection element and the position of the image sensor in the imaging surface of the image sensor is determined. A detection stage for detecting, and a recording stage for recording information indicating positional deviation in the imaging apparatus.

  It should be noted that the above summary of the invention does not enumerate all the necessary features of the present invention. In addition, a sub-combination of these feature groups can also be an invention.

An example of the external appearance of the camera 10 is shown typically. 1 is a block diagram schematically showing a system configuration of a camera 10. FIG. An AF area display presented to the user through the finder window 14 is shown. The case where the image pick-up element 30 is seen along the optical axis direction of a lens system is shown. An arrangement example of light receiving elements included in the focus detection element 40 is shown. The vicinity of the reference position of the focus detection element 40 is shown enlarged. An example of the finder image 700 observed in the finder before photographing by the user is shown. An example of a reproduced image displayed on the display unit 53 is shown. It is a figure which shows the adjustment system containing the adjustment apparatus 1000 and the camera 10 which are used in the adjustment process of a camera. An example of the first finder image 1080 is shown. A state in which the light beam 1100 is incident on the focus detection element 40 when the display device 1030 displays a vertically long rectangular line is schematically shown. An example of the 2nd finder image 1280 is shown. A state in which the light beam 1300 is incident on the focus detection element 40 when the display device 1030 displays a horizontally long rectangular line is schematically shown. The mirror unit 20 included in the camera body 130 shows a retracted state in which it is retracted from the optical axis of the lens unit 120. A mode that the light ray 1500 is incident on the image sensor 30 when the display device 1030 displays a vertically long rectangular line is schematically shown. A state in which the light beam 1600 is incident on the image sensor 30 when the display device 1030 displays a horizontally long rectangular line is schematically shown. An example of the flow in the adjustment process of the camera 10 is shown.

  Hereinafter, the present invention will be described through embodiments of the invention, but the following embodiments do not limit the invention according to the claims. In addition, not all the combinations of features described in the embodiments are essential for the solving means of the invention.

  FIG. 1 schematically shows an example of the appearance of the camera 10. The camera 10 of this embodiment is a single-lens reflex camera. The camera 10 includes a camera body 130 and a lens unit 120. The lens unit 120 is an interchangeable lens, and the lens unit 120 is detachable from the camera body 130. FIG. 1 shows a state where the lens unit 120 is attached to the camera body 130. The camera main body 130 is provided with a release button 12, a multi selector 13, a display unit 53, and a finder window 14.

  In the camera 10, when a mirror unit 20, which will be described later, has advanced into the optical axis of the lens unit 120, an optical image of the subject by light passing through the lens system of the lens unit 120 is transmitted to the user through the finder window 14. Presented. A focus point frame indicating the focus adjustment target position is superimposed on the optical image of the subject and presented to the user. The focus point frame is displayed by an AF position display element 60 described later.

  A plurality of target positions for focus adjustment are prepared within the angle of view. The user operates the multi-selector 13 to change the focus adjustment target position by changing the selection state of the focus point frame. Note that the focus adjustment target position may be simply referred to as a “focus adjustment position”.

  When the release button 12 is half-pressed, the camera 10 performs focus adjustment on the subject at the focus adjustment position corresponding to the selected focus point based on the focus state detected by the focus detection element 40 described later. . When the release button 12 is fully pressed, the camera 10 records image data obtained by an imaging operation of an imaging device 30 described later in an external memory 80 described later. At this time, the camera 10 records the AF position information indicating the focus adjustment position selected at the time of imaging along with the image data.

  As will be described later, the relative positional deviation amount in the imaging plane between the imaging element 30 and the focus detection element 40 in the camera 10 is optically measured, and the first positional deviation information indicating the positional deviation amount is the camera. 10 is recorded in advance. In addition, a relative positional shift amount between the focus detection element 40 and the AF position display element 60 is optically measured in the camera 10, and second positional shift information indicating the positional shift amount is recorded in the camera 10 in advance. ing. For example, the camera 10 is shipped in a state where the first positional deviation information and the second positional deviation information are recorded.

  When performing the focus adjustment according to the half-press operation of the release button 12 or the like, the camera 10 performs the focus adjustment on the subject at the position corrected according to the second positional deviation information. Further, when the image data is recorded in the external memory 80, the camera 10 records the AF position information corrected according to the first position shift information along with the image data. When reproducing the image data, the camera 10 causes the display unit 53 to display a focus point mark superimposed on the position recorded accompanying the image data.

  According to the camera 10, even if the imaging device 30 and the focus detection device 40 are assembled with an error, the focus adjustment can be performed on the subject at the focus adjustment position designated by the user through the finder window 14. . Further, at the time of image reproduction, even if the imaging device 30 and the AF position display device 60 are assembled with an error, the image is correctly focused on the subject image of the subject at the focus adjustment position designated by the user through the finder window 14. Point marks can be superimposed and displayed.

  FIG. 2 is a block diagram schematically showing the system configuration of the camera 10. The control unit 52 controls the entire camera body 130 and the lens unit 120. The control unit 52 is realized by a processor such as an MPU.

  The control unit 52 determines conditions such as a focal length, a diaphragm, and a focus state of the lens system included in the lens unit 120, and supplies a control signal indicating the determined conditions to the lens driving unit 71. Based on the control signal supplied from the control unit 52, the lens driving unit 71 controls the focal length, the diaphragm, the focus state, and the like of the lens system included in the lens unit 120. Unless otherwise specified, the lens system included in the lens unit 120 is referred to as a “lens system”.

  The focus detection element 40 is provided at a position different from that of the image sensor 30 and detects the focus state of the lens system. The focus detection element 40 includes a plurality of light receiving element arrays that receive subject light. Each of the plurality of light receiving element rows included in the focus detection element 40 outputs a signal having the same phase when in focus with respect to the subject, and when in the front pin state or the rear pin state, the phase is detected. Outputs the shifted signal. The amount of phase shift corresponds to the amount of shift from the in-focus state. The focus detection element 40 performs a correlation operation on the output of the light receiving element array to detect a phase difference, and outputs a phase difference signal indicating the phase difference to the control unit 52.

  The focus state of the lens system is adjusted using the phase difference signal from the focus detection element 40 under the control of the control unit 52, the lens driving unit 71, and the like. For example, the control unit 52 controls the in-lens MPU of the lens unit 120 based on the focus state indicated by the phase difference signal, and controls the position of the focus lens included in the lens system at the target position corresponding to the focus state. .

  A plurality of focus adjustment positions are set within the imaging range of the imaging element 30. The focus detection element 40 is provided with light receiving element arrays at a plurality of positions corresponding to a plurality of focus adjustment positions, respectively. The control unit 52 can control the focus adjustment at each of the plurality of focus adjustment positions based on the focus state detected by the focus detection element 40.

  The AF position display element 60 displays a mark indicating the focus adjustment position, superimposed on the optical image formed by the light that has passed through the lens system. The AF position display element 60 has a plurality of light emitting elements provided at positions corresponding to a plurality of focus adjustment positions. When a predetermined operation is performed on the operation input unit 47 including the multi-selector 13, the control unit 52 selects a light emitting element at a position corresponding to the currently set focus adjustment position among the plurality of focus adjustment positions. Make it emit light. Thus, the user can recognize the currently set focus adjustment position through the finder window 14.

  The user can select one focus adjustment position from among a plurality of focus adjustment positions by operating the multi selector 13 as a part of the operation input unit 47. When the control unit 52 detects that the release button 12 is half-pressed, the light receiving element provided at the position corresponding to the currently selected focus adjustment position among the plurality of light receiving element rows of the focus detection element 40. Focus adjustment is controlled based on the focus state detected in the column. Thereby, focus adjustment is performed on the subject at the focus adjustment position selected by the user. As described above, the control unit 52 has the focus of the focus detection element 40 that detects the focus state of the lens system provided at a position optically corresponding to the position where the mark is displayed in the plane where the optical image is formed. Control focus adjustment based on state.

  The image sensor 30 captures an image of a subject using light that has passed through the lens unit 120 attached to the camera body 130. The imaging operation of the imaging element 30 is controlled by the control unit 52. The image sensor 30 includes a solid-state image sensor such as a CMOS sensor or a CCD sensor. The pixel signal generated by the imaging operation of the imaging element 30 is output to the image processing unit 51 under the control of the control unit 52.

  The image processing unit 51 is realized by, for example, an ASIC. The image processing unit 51 processes the pixel signal output from the image sensor 30 under the control of the control unit 52 to generate image data. The generated image data is displayed as an image on the display unit 53 for a certain time after imaging, for example. The image processing unit 51 processes the generated image data into a predetermined image format. For example, the image processing unit 51 processes the image data into a JPEG file as an image format for still images, an MPEG file as an image format for moving images, or the like.

  The control unit 52 records the image file generated by the image processing unit 51 in the external memory 80. The external memory 80 is a nonvolatile recording medium. The external memory 80 is detachably provided on the camera body 130. The external memory 80 may be a memory card such as a semiconductor memory.

  Note that when the live view imaging operation is performed in the camera 10, the image processing unit 51 causes the display unit 53 to sequentially display images based on the pixel signals output from the imaging element 30. At this time, the image processing unit 51 processes the pixel signal output from the image sensor 30 according to the control from the control unit 52, and generates a contrast evaluation value indicating the contrast amount of the subject image. The control unit 52 generates a focus adjustment control signal based on the contrast evaluation value and supplies the focus adjustment control signal to the lens driving unit 71.

  The external connection IF 56 is responsible for communication with external devices. The image data generated in the image processing unit 51 is output to an external device via the external connection IF 56. The external connection IF 56 may be a USB interface, an HDMI (registered trademark) interface, a wireless communication interface, or the like. Examples of the external device include a personal computer, a printer, and a digital photo stand. When the external device is a video device, the image data as the video data is transmitted as a video signal via the external connection IF 56.

  The system memory 57 is an example of a nonvolatile memory. The system memory 57 is a flash memory, for example. The system memory 57 is an example of a nonvolatile memory, and plays a role of storing a program for controlling the camera 10, various parameters, and the like. The program includes an operating system (OS). The system memory 57 records first positional deviation information and second positional deviation information described later.

  The SDRAM 58 is an example of a volatile memory. The SDRAM 58 is a memory that can be accessed at a higher speed than the system memory 57. The SDRAM 58 stores the OS transferred from the system memory 57. The SDRAM 58 also serves as a work memory that temporarily stores image data being processed by the image processing unit 51.

  The operation input unit 47 includes a release button 12, a multi selector 13, and the like. The control unit 52 acquires a signal indicating a user operation on the operation input unit 47 from the operation input unit 47 and performs various processes according to the user operation.

  Each part of the camera body 130, each part of the lens unit 120, and the external memory 80 are supplied with power from the power supply unit 90. Examples of the power supply unit 90 include a secondary battery such as a lithium ion battery that can be attached to and detached from the camera body 130, a system power supply, and the like. The secondary battery is an example of a battery, and the battery includes a primary battery that cannot be substantially charged.

  FIG. 3 shows an AF area display presented to the user through the finder window 14. In the AF area display, eleven focus points 300 are presented in the focus point frame. Eleven focus points 300 are distinguished by subscripts a to k. The focus point 300a indicates a focus adjustment position that should correspond to the center of the optical axis of the lens system. Each of the focus points 300 corresponds to one focus adjustment position.

  Each focus point 300 is displayed by a corresponding one of the plurality of light emitting elements included in the AF position display element 60. FIG. 3 shows a reference position 65 that serves as a reference for the physical position of the AF position display element 60. The reference position 65 will be described later.

  FIG. 4 shows an image pickup surface when the image pickup device 30 is viewed along the optical axis direction of the lens system. In FIG. 4, the position optically corresponding to the focus point 300 is indicated by a dotted line. FIG. 4 shows a reference position 35 that serves as a reference for the physical position of the image sensor 30 together with the reference position 65 of the AF position display element 60. The reference position 35 will be described later.

  FIG. 5 shows an arrangement example of light receiving elements included in the focus detection element 40. In FIG. 5, a position optically corresponding to the light emitting element that provides the focus point 300 is indicated by a dotted line. FIG. 5 shows a reference position 65 of the AF position display element 60.

  The focus detection element 40 has twelve line sensors 400. Twelve line sensors 400 are distinguished by subscripts a to l. The line sensor 400a, the line sensor 400b, the line sensor 400c, the line sensor 400d, the line sensor 400e, the line sensor 400f, and the line sensor 400g each include a plurality of light receiving elements 410 arranged in the x direction. Each of the line sensor 400h, the line sensor 400i, the line sensor 400j, the line sensor 400k, and the line sensor 400l includes a plurality of light receiving elements 420 arranged in the y direction. The light receiving element 410 and the light receiving element 420 will be described later with reference to FIG. The focus state at the corresponding position is detected by phase-correlating the outputs of the plurality of light receiving elements provided in the same line sensor 400.

  The image sensor 30, the AF position display element 60, and the focus detection element 40 are assembled by being substantially aligned in the assembling process, but are actually assembled with some errors. Therefore, the corresponding position of the focus detection element 40 in the imaging surface and the imaging element 30 are assembled so as to be displaced relative to each other in the imaging surface. Further, the corresponding position of the AF position display element 60 in the imaging plane and the imaging element 30 are assembled with a relative positional shift in the imaging plane. In addition, on the optical image plane that is the surface on which the optical image of the subject is formed, the corresponding position of the AF position display element 60 on the optical image plane and the corresponding position of the focus detection element 40 on the optical image plane are relatively positioned. Misaligned and assembled. The camera 10 performs processing in consideration of these positional deviations. In this embodiment, in order to express the positional deviation in an easy-to-understand manner, a state in which the positional deviation is large is shown.

  In the description of the present embodiment, the relative positional deviation among the image sensor 30, the focus detection element 40, and the AF position display element 60 is determined based on the reference position in the image sensor 30, the reference position in the focus detection element 40, and AF. This is expressed using the reference position in the position display element 60. Here, a point corresponding to the optical axis of the lens system is used as the reference position. Specifically, the reference position 35 of the image sensor 30 is set at the center of the effective pixel area of the image sensor 30. The reference position 45 of the focus detection element 40 is set at the intersection of the central axis 411 along the arrangement direction of the light receiving elements 410 in the line sensor 400a and the central axis 412 along the arrangement direction of the light receiving elements 420 in the line sensor 400h. The reference position 65 of the AF position display element 60 is set to the center position of the light emitting element that provides the focus point 300a. The reference position may be any position as long as it can represent a relative positional shift.

  As shown in FIG. 4, the AF position display element 60 and the image sensor 30 are assembled with a shift of ΔX in the x direction and ΔY in the y direction in the image pickup plane. Further, as shown in FIG. 5, the focus detection element 40 and the AF position display element 60 are assembled with a shift of Δx in the x direction and Δy in the y direction on the optical image plane.

  The mutual positional deviation amounts of the image sensor 30, the focus detection element 40, and the AF position display element 60 are optically measured after the image sensor 30, the focus detection element 40, and the AF position display element 60 are assembled as will be described later. Information indicating the amount of positional deviation is recorded in the system memory 57. Specifically, information indicating the amount of positional deviation is recorded in association with identification information for identifying each of the plurality of focus points 300. For example, in the system memory 57, first position shift information indicating the position in the imaging surface corresponding to each focus point 300 is recorded in association with the identification information of the focus point 300. Further, in the system memory 57, second positional deviation information including identification information of the light receiving element 410 and the light receiving element 420 existing at the optically corresponding positions is recorded in association with the identification information of the focus point 300. .

  FIG. 6 shows an enlarged view of the vicinity of the reference position of the focus detection element 40. When performing focus adjustment at the focus point 300a, the control unit 52 includes the light receiving element 410a, the light receiving element 410b, the light receiving element 410c, the light receiving element 410d, the light receiving element 410e, the light receiving element 410f, the light receiving element 410g, and the light receiving element that the line sensor 400a has. 410h, light receiving element 410i, light receiving element 410j, light receiving element 410k,..., A predetermined number of light receiving elements (light receiving element 410c, light receiving element 410d, light receiving element 410e, light receiving element) at positions corresponding to the positional deviation Δx. The focus state is detected by the element 410f, the light receiving element 410g, the light receiving element 410h, the light receiving element 410i, and the light receiving element 410j). In addition, the control unit 52 includes a position among the light receiving element 420a, the light receiving element 420b, the light receiving element 420c, the light receiving element 420d, the light receiving element 420e, the light receiving element 420f, the light receiving element 420g, the light receiving element 420h,. The focus state is detected by a predetermined number of light receiving elements 420 (light receiving element 420b, light receiving element 420c, light receiving element 420d, light receiving element 420e, light receiving element 420f) at positions corresponding to the deviation Δy.

  Specifically, in the system memory 57, the light receiving element 410c, the light receiving element 410d, the light receiving element 410e, and the light receiving element 410f selected in accordance with the measured positional deviation Δx in association with information for identifying the focus point 300a. , Identification information for identifying the light receiving element 410g, the light receiving element 410h, the light receiving element 410i, and the light receiving element 410j, and identification information for identifying the light receiving element 420b, the light receiving element 420c, the light receiving element 420d, the light receiving element 420e, and the light receiving element 420f. It is recorded as second positional deviation information. When the focus adjustment at the focus point 300a is selected, the control unit 52 receives light based on the identification information of the light receiving element associated with the focus point 300a in the detection element information recorded in the system memory 57. The element 410c, the light receiving element 410d, the light receiving element 410e, the light receiving element 410f, the light receiving element 410g, the light receiving element 410h, the light receiving element 410i, and the light receiving element 410j are selected, and the phase difference output from the selected light receiving element 410 and the light receiving element 420 is selected. Based on the signal, the focus state is calculated.

  Similarly, with respect to the focus points 300b to k, the identification information of the light receiving elements 410 and 420 determined according to the positional deviation in association with the identification information for identifying the focus points 300b to 300k is used as detection element information. It is recorded in the memory 57. The control unit 52 selects the light receiving element 410 and the light receiving element 420 based on the identification information of the light receiving element associated with the focus point 300 selected by the user in the detection element information recorded in the system memory 57, Based on the phase difference signal output from the selected light receiving element 410 and light receiving element 420, the focus state is calculated. As a result, the control unit 52 can select the appropriate light receiving element 410 and light receiving element 420 associated with the focus point 300 selected by the user, and calculate the focus state.

  FIG. 7 shows an example of a viewfinder image 700 observed by the user in the viewfinder before photographing. FIG. 7 shows a case where the focus point 300a is selected. The mark 710 indicating the focus point shown in FIG. 7 is formed by the light emitting element corresponding to the focus point 300 selected by the multi selector 13 emitting light, and is superimposed on the optical image 720 of the subject and presented to the user. . When the release button is pressed, the control unit 52 uses the AF position indicating the position on the image corresponding to the focus point 300a based on the first position shift information as the auxiliary information of the image data generated by the image processing unit 51. The external memory 80 is recorded along with the information. As described above, the control unit 52 records information corresponding to the positional deviation indicating the focus adjustment target position in association with the image data obtained by the imaging element 30.

  FIG. 8 shows an example of a reproduced image displayed on the display unit 53. Based on the AF position information stored in the image data, the control unit 52 superimposes on the image 800 and displays the mark 810. The AF position information recorded accompanying the image data is corrected by the first position shift information indicating the relative position shift with respect to the image sensor 30 with respect to the position corresponding to the reference position 35 of the image sensor 30. Value. For this reason, the mark 810 is displayed at a position on the image that optically corresponds to the focus point 300 a selected by the user through the finder window 14. In this way, the control unit 52 superimposes on the image and displays the mark indicating the focus adjustment target position at a position corresponding to the positional deviation.

  The control unit 52 may not only record the positional deviation information in the image data or display the mark 810 based on the positional deviation information on the display unit 53, but may output the positional deviation information in various forms. In other words, the control unit 52 may output information indicating the focus adjustment target position based on the focus state in the image obtained by the image sensor 30 according to the positional deviation.

  As described above, according to the camera 10, focus adjustment can be performed on a subject position that optically correctly corresponds to the focus point 300 selected by the user through the finder window 14. Also, on the image reproduction screen, a mark indicating the focus point can be displayed at a position on the image optically corresponding to the focus point 300 selected by the user through the finder window 14. As described above, according to the camera 10, even when the image sensor 30, the focus detection element 40, and the AF position display element 60 are assembled so as to be misaligned with each other, the camera 10 is focused on the correct subject position considering the misalignment. Adjustments can be made. In addition, the position of the focus point displayed on the image reproduction screen does not greatly deviate from the position selected by the user.

  FIG. 9 is a diagram showing an adjustment system including the adjustment device 1000 and the camera 10 used in the camera adjustment process. The adjustment device 1000 includes a control device 1010, an imaging device 1020, and a display device 1030. The imaging device 1020 and the display device 1030 are positioned and fixed with respect to the camera 10. The imaging device 1020 is provided so that an optical image formed by the pentaprism and the AF position display element 60 can be captured through the finder window. The display device 1030 is provided so that the display surface faces the imaging surface of the image sensor 30 so that the image displayed on the display surface of the display device 1030 can be captured by the image sensor 30.

  In FIG. 9, the mirror unit 20 included in the camera body 130 of the camera 10 is in a state of being advanced into the optical axis of the lens unit 120. An optical image formed by a part of the light incident and reflected on the main mirror 21 is picked up by the image pickup device 1020 through the pentaprism 24, the eyepiece optical system 25 and the finder window 14. The optical image of the focus point 300 is superimposed on the optical image of the light incident on the main mirror 21 by the light emitting element included in the AF position display element 60 and is captured as a finder image by the imaging device 1020. The viewfinder image captured by the imaging device 1020 is output to the control device 1010.

  A part of the light incident on and transmitted through the main mirror 21 is reflected by the sub-mirror 22 and enters the focus detection element 40. The control device 1010 outputs a signal indicating the amount of light received by the light receiving element 410 and the light receiving element 420 included in the focus detection element 40 to the control device 1010.

  The display device 1030 switches between a vertically long rectangular line image and a horizontally long rectangular line image based on the control of the control device 1010. Note that the vertical direction corresponds to the y direction on the image sensor 30. Further, the horizontal direction corresponds to the x direction on the image sensor 30.

  The control device 1010 causes the imaging device 1020 to capture the first finder image while the display device 1030 is displaying an image of a vertically long rectangular line, and acquires image data of the first finder image. Further, the control device 1010 acquires signals from the light receiving element 410 and the light receiving element 420 included in the focus detection element 40 in a state where an image of a vertically long rectangular line is displayed on the display device 1030.

  Further, the control device 1010 causes the imaging device 1020 to capture the second finder image in a state where the display device 1030 displays the image of the horizontally long rectangular line, and acquires image data of the second finder image. Further, the control device 1010 acquires signals from the light receiving element 410 and the light receiving element 420 included in the focus detection element 40 in a state where an image of a horizontally long rectangular line is displayed on the display device 1030.

  FIG. 10 shows an example of the first viewfinder image 1080. The first viewfinder image 1080 includes a focus point image 1110a of the focus point 300a, a focus point image 1110b of the focus point 300b, a focus point image 1110c of the focus point 300c, and a rectangular line formed by light rays emitted from the display device 1030. An image 1120 is included.

  The control device 1010 analyzes the first finder image 1080 picked up by the image pickup device 1020, and calculates a shift amount 1150 in the x direction on the first finder image 1080. Specifically, the control device 1010 calculates the shift amount 1150 based on the positions of the focus point image 1110a, the focus point image 1110b, and the focus point image 1110c, and the position of the display line image 1120. For example, the control device 1010 is based on the difference between the average value of the x coordinate of the focus point image 1110a, the x coordinate of the focus point image 1110b, and the x coordinate of the focus point image 1110c, and the x coordinate of the center position of the display line image 1120. Thus, a deviation amount 1150 is calculated.

  FIG. 11 schematically shows a state in which the light beam 1100 is incident on the focus detection element 40 when the display device 1030 displays a vertically long rectangular line. The control device 1010 calculates the x coordinate of the central axis of the light beam 1100 emitted from the display device 1030 based on the received light amount indicated by the signal from each of the light receiving elements 410 included in the line sensor 400a. The control device 1010 calculates a deviation 1160 between the calculated x-coordinate of the central axis and the x-coordinate of the reference position 45 of the focus detection element 40.

  FIG. 12 shows an example of the second viewfinder image 1280. The second finder image 1280 includes a focus point image 1210a at the focus point 300a, a focus point image 1210d at the focus point 300d, a focus point image 1210g at the focus point 300g, a focus point image 1210j at the focus point 300j, and a focus point at the focus point 300k. An image 1210k and a line image 1220 formed by light rays emitted from the display device 1030 are included.

  The control device 1010 analyzes the second finder image 1280 picked up by the image pickup device 1020 and calculates a shift amount 1250 in the y direction on the second finder image 1280. Specifically, the control device 1010 shifts based on the positions of the focus point image 1210a, the focus point image 1210d, the focus point image 1210g, the focus point image 1210j, and the focus point image 1210k and the display line image 1220. The quantity 1250 is calculated. For example, the control device 1010 calculates the average value of the y coordinate of the focus point image 1210a, the y coordinate of the focus point image 1210d, the y coordinate of the focus point image 1210g, the y coordinate of the focus point image 1210j, and the y coordinate of the focus point image 1210k. Based on the difference from the y-coordinate of the center position of the rectangular line image 1220, the shift amount 1250 is calculated.

  FIG. 13 schematically illustrates a state in which the light beam 1300 is incident on the focus detection element 40 when the display device 1030 displays a horizontally long rectangular line. The control device 1010 calculates the y coordinate of the central axis of the light beam 1300 emitted from the display device 1030 based on the amount of received light indicated by the signal from each of the light receiving elements 420 included in the line sensor 400h. The control device 1010 calculates a deviation 1260 between the calculated y coordinate of the central axis and the y coordinate of the reference position 45 of the focus detection element 40.

  Based on the shift amount 1150 and the shift amount 1160, the control device 1010 selects the light receiving element 410 to be used for detecting the focus state when the focus point 300a is selected. For example, the control device 1010 calculates a positional shift amount Δx between the reference position 65 of the AF position display element 60 and the reference position 45 of the focus detection element 40 based on the shift amount 1150 and the shift amount 1160. Based on the positional deviation amount Δx, the control device 1010 is predetermined as a light receiving element 410 to be used for detection of the focus state, centered on a position optically corresponding to the reference position 65 of the AF position display element 60. A number of light receiving elements 410 are selected. Similarly, for each of the focus points 300b to k, the control device 1010 selects the light receiving element 410 to be used for detecting the focus state when each focus point 300 is selected.

  Further, the control device 1010 selects the light receiving element 420 to be used for detecting the focus state when the focus point 300a is selected based on the shift amount 1250 and the shift amount 1260. For example, the control device 1010 calculates a positional deviation amount Δy between the reference position 65 of the AF position display element 60 and the reference position 45 of the focus detection element 40 based on the deviation amount 1250 and the deviation amount 1260. Based on the positional deviation amount Δy, the control device 1010 is predetermined as a light receiving element 420 to be used for detecting the focus state, centered on a position optically corresponding to the reference position 65 of the AF position display element 60. A number of light receiving elements 420 are selected. Similarly, for each of the focus points 300b to k, the control device 1010 selects the light receiving element 420 to be used for detecting the focus state when each focus point 300 is selected.

  The control device 1010 records the identification information of the light receiving element 410 selected for the focus point 300a and the identification information of the light receiving element 420 in the system memory 57 in association with the identification information of the focus point 300a. Similarly, the control device 1010 records the identification information of the light receiving element 410 and the identification information of the light receiving element 420 selected for each of the focus points 300 b to k in the system memory 57 in association with the identification information of each focus point 300. To do.

  FIG. 14 shows a retracted state in which the mirror unit 20 included in the camera body 130 is retracted from the optical axis of the lens unit 120. The control device 1010 controls the camera 10 to retract the mirror unit 20 from the optical axis of the lens unit 120. In this case, the light that has passed through the lens system of the lens unit 120 enters the image sensor 30. An image based on the light incident on the image sensor 30 is output to the control device 1010.

  When the mirror unit 20 is in the retracted state, the display device 1030 switches between the above-described vertically long rectangular line image and the above-described horizontally long rectangular line image based on the control of the control device 1010. The control device 1010 causes the imaging device 30 to perform an imaging operation in a state where an image of a vertically long rectangular line is displayed on the display device 1030, and uses the image data of the first captured image obtained by the imaging operation as a camera. Get from 10. In addition, the control device 1010 causes the imaging device 30 to perform an imaging operation in a state where the image of the horizontally long rectangular line is displayed on the display device 1030, and obtains image data of the second captured image obtained by the imaging operation. Obtained from the camera 10.

  FIG. 15 schematically illustrates a state in which the light beam 1500 is incident on the image sensor 30 when the display device 1030 displays a vertically long rectangular line. The control device 1010 analyzes the first captured image output from the camera 10 and calculates the x coordinate of the central axis of the rectangular line image on the first captured image. The control device 1010 converts the calculated x-coordinate of the central axis into the x-coordinate on the imaging surface by the imaging device 30. The control device 1010 calculates the amount of deviation 1550 between the x coordinate of the central axis on the imaging surface and the x coordinate of the reference position of the image sensor 30.

  FIG. 16 schematically illustrates a state in which the light beam 1600 is incident on the image sensor 30 when the display device 1030 displays a horizontally long rectangular line. The control device 1010 analyzes the second captured image output from the camera 10 and calculates the y coordinate of the central axis of the rectangular line image on the second captured image. The control device 1010 converts the calculated y coordinate of the central axis into the y coordinate on the imaging surface by the imaging element 30. The control device 1010 calculates the amount of deviation 1560 between the y coordinate of the central axis on the imaging surface and the y coordinate of the reference position of the image sensor 30.

  Based on the shift amount 1150 described with reference to FIG. 10 and the like and the shift amount 1550 described with reference to FIG. 15 and the like, the control device 1010 x on the imaging surface optically corresponding to the focus point 300a. Calculate the coordinates. In addition, the control device 1010 is configured to display the image on the imaging surface optically corresponding to the focus point 300a based on the amount of deviation 1260 described with reference to FIG. 12 and the amount of deviation 1560 described with reference to FIG. The y coordinate is calculated. Similarly, the control apparatus 1010 calculates the x coordinate on the imaging surface optically corresponding to each focus point 300 for each of the focus points 300b to k based on the shift amount 1150 and the shift amount 1550. Further, the control device 1010 calculates the y coordinate on the imaging surface optically corresponding to each focus point 300 for each of the focus points 300b to k based on the shift amount 1260 and the shift amount 1560.

  The control device 1010 associates information indicating the x-coordinate and y-coordinate on the imaging surface optically corresponding to the focus point 300a, calculated for the focus point 300a, with the identification information of the focus point 300a. Recorded in the memory 57 as the first positional deviation information. Similarly, the control device 1010 uses the x-coordinate and y-coordinate calculated on each of the focus points 300b to k on the imaging surface optically corresponding to each focus point 300 as identification information of each focus point 300. In association therewith, it is recorded in the system memory 57 of the camera 10 as first positional deviation information.

  Here, the positional deviation amount ΔX between the reference position 65 of the AF position display element 60 and the reference position 35 of the image sensor 30 is the x coordinate on the image plane optically corresponding to each focus point 300 and the reference of the image sensor 30. This corresponds to the difference between the position 35 and the x coordinate. The positional deviation amount ΔY between the reference position 65 of the AF position display element 60 and the reference position 35 of the image sensor 30 is determined by the y coordinate on the image plane optically corresponding to each focus point 300 and the reference position of the image sensor 30. This corresponds to the difference between 35 and the y coordinate. Therefore, the x-coordinate and y-coordinate on the imaging surface calculated for each focus point 300a can be said to be information indicating the positional deviations ΔX and ΔY between the reference position 65 of the AF position display element 60 and the reference position 35 of the imaging element 30. Note that the information indicating the positional deviation ΔX and the positional deviation ΔY may be recorded as relative values with respect to the horizontal and vertical widths of the effective pixels of the imaging element 30 in addition to absolute coordinate values on the imaging surface. Further, the information indicating the positional deviation ΔX and the positional deviation ΔY identifies a pixel that is present at the closest position to the position of the x-coordinate and y-coordinate corresponding to each focus point 300 among the effective pixels of the image sensor 30. Information may be recorded.

  As described above, the system memory 57 of the camera 10 records the position information recording unit that records information indicating the relative positional deviation between the corresponding position of the focus detection element 40 and the position of the imaging element 30 in the imaging plane of the imaging element 30. Function as. The system memory 57 records element information for recording information for identifying a light receiving element provided at a position corresponding to a positional shift, which should be used for detection of a focus state, among a plurality of light receiving elements included in the focus detection element 40. It functions as a part.

  FIG. 17 shows an example of a flow in the adjustment process of the camera 10.

  When this flow starts, in step S1700, the camera 10 to be adjusted is prepared and fixed in a state of being positioned with respect to the adjusting device 1000. In step S <b> 1702, the control device 1010 keeps the mirror unit 20 of the camera 10 in the advanced state in the optical axis of the lens system of the lens unit 120.

  In step S1704, the control device 1010 causes the display device 1030 to display a vertically long rectangular line. Light that forms an image emitted from the display device 1030 is received as measurement light by a plurality of light receiving elements of the focus detection element 40.

  In step S1706, the control device 1010 causes the imaging device 1020 to capture the first finder image, acquires image data of the first finder image from the imaging device 1020, and analyzes the first finder image. The control device 1010 calculates the shift amount 1150 in the x direction described with reference to FIG. 10 and the like by analyzing the first finder image.

  In step S1708, the control device 1010 acquires and analyzes the output of the focus detection element 40. In step S1708, the control device 1010 calculates the amount of displacement 1160 in the x direction described with reference to FIG.

  Subsequently, in step S1710, control device 1010 causes display device 1030 to display a horizontally long rectangular line.

  In step S1712, the control apparatus 1010 causes the imaging apparatus 1020 to capture the second finder image, acquires image data of the second finder image from the imaging apparatus 1020, and analyzes the second finder image. The control device 1010 calculates the shift amount 1250 in the y direction described with reference to FIG. 12 and the like by analyzing the second finder image. As described in relation to step S1706 and step S1712, the control device 1010 performs a relative positional shift between the optical image formed by the measurement light and the position of the mark superimposed on the optical image formed by the measurement light. Is detected.

  In step S1714, the control device 1010 acquires and analyzes the output of the focus detection element 40. In step S <b> 1714, the control device 1010 calculates the displacement amount 1260 in the y direction described with reference to FIG. 13 and the like.

  In step S <b> 1716, the control device 1010 selects the light receiving element 410 and the light receiving element 420 used by the focus detection element 40 for each focus point 300. As described above, the control device 1010 receives the light receiving element 410 used for detecting the focus state when the focus point 300 is selected for each focus point 300 based on the shift amount 1150 and the shift amount 1160. Select. Control device 1010 selects light receiving element 420 to be used for detecting the focus state when each focus point 300 is selected for each focus point 300 based on shift amount 1250 and shift amount 1260. .

  In step S1718, the control device 1010 records the identification information of the light receiving element 410 and the light receiving element 420 selected in step S1716 in the system memory 57 of the camera 10 in association with the identification information of the corresponding focus point 300. Thereby, the second positional deviation information is recorded in the camera 10. As described above, the control device 1010, based on the positional deviation described in relation to step S1706 and step S1712, has marks in the plane on which the optical image is formed among the plurality of light receiving elements of the focus detection element 40. A light receiving element provided at a position optically corresponding to the position to be displayed is selected as a focus detection element 40 to be used for detecting the focus state, and information for identifying the selected light receiving element is recorded in the imaging apparatus. .

  In step S1722, the control device 1010 causes the mirror unit 20 of the camera 10 to be in a retracted state.

  In step S1724, the control device 1010 causes the display device 1030 to display a vertically long rectangular line. Light that forms an image emitted from the display device 1030 is received by a plurality of light receiving elements having 30 images of the image sensor as measurement light.

  In step S1726, the control device 1010 causes the camera 10 to capture the first captured image, acquires image data of the first captured image from the camera 10, and analyzes the first captured image. The control device 1010 calculates the shift amount 1550 in the x direction described with reference to FIG. 15 and the like by analyzing the first captured image.

  In step S1728, control device 1010 causes display device 1030 to display a horizontally long rectangular line.

  In step S1730, the control device 1010 causes the camera 10 to capture the second captured image, acquires image data of the second captured image from the camera 10, and analyzes the second captured image. The control device 1010 calculates the shift amount 1560 in the x direction described with reference to FIG. 16 and the like by analyzing the second captured image.

  In step S1732, the control device 1010 calculates, for each focus point 300, the x coordinate and the y coordinate on the imaging surface to which each focus point 300 optically corresponds. As described above, the control device 1010 calculates the x coordinate on the imaging surface to which each focus point 300 optically corresponds based on the shift amount 1150 and the shift amount 1550. Further, the control device 1010 calculates the y coordinate on the imaging surface to which each focus point 300 corresponds optically based on the shift amount 1250 and the shift amount 1560.

  In step S1734, the control device 1010 associates the x coordinate and y coordinate on the imaging surface optically corresponding to each focus point 300 with the identification information of the corresponding focus point 300 in the system memory 57 of the camera 10. Record. Thereby, the first positional deviation information is recorded in the camera 10. As described above, the control device 1010 includes the position of the light receiving element that detects the measurement light among the plurality of light receiving elements included in the focus detection element 40 and the light receiving element that detects the measurement light among the plurality of light receiving elements included in the imaging element 30. The relative position shift between the corresponding position of the focus detection element 40 and the position of the image pickup device 30 in the image pickup surface of the image pickup device 30 is detected based on the position of the image pickup device 30, and information indicating the position shift is obtained from the image pickup apparatus. To record.

  In step S1736, the control device 1010 causes the mirror unit 20 of the camera 10 to enter the advanced state. In step S1738, the control device 1010 removes the camera 10 from the adjustment device 1000 and ends this flow. When adjusting another camera, another camera is selected and each step described in this flow is repeated.

  In the camera 10, the mark indicating the focus point 300 displayed by the light emitting element of the AF position display element 60 is displayed at a fixed position on the optical image of the subject. However, if the AF position display element 60 is realized by, for example, the dot matrix method, the position of the mark indicating the focus point 300 can be changed after the imaging element 30, the focus detection element 40, and the AF position display element 60 are assembled. it can. In this case, the control unit 52 superimposes on the optical image formed by the light that has passed through the lens system based on the adjustment result described above, and at the corresponding position of the focus detection element 40 in the plane on which the optical image is formed. A mark indicating a target position for focus adjustment based on the focus state may be displayed.

  The AF position display element 60 is an example of a display element that displays information superimposed on an optical image formed by light that has passed through a lens system. Instead of the AF position display element 60 or in addition to the AF position display element 60, a display element that displays various information is used as an adjustment target of the relative positional deviation between the imaging element 30 and the focus detection element 40. Good.

  The camera 10 may not have the AF position display element 60. The camera 10 may not have the focus detection element 40. In the present embodiment, the focus detection element 40 is formed of a plurality of light receiving elements, and the light receiving element corresponding to each focus point 300 is selected. As another form, a plurality of focus detection elements each having a plurality of light receiving elements may be provided at different positions, and a focus detection element corresponding to each focus point 300 may be selected.

  In the above description, the processing described as the operation of the control unit 52 is realized by the control unit 52 controlling each hardware of the camera 10 according to a program. Similarly, the processing realized by the image processing unit 51 in the above description can be realized by a processor. As described above, the processing of the camera 10 described in relation to the camera 10 according to the present embodiment is performed by the processor operating according to the program to control each hardware, and thereby each hardware and program including the processor, the memory, etc. Can be realized by operating together. That is, the process can be realized by a so-called computer. Similarly, the processing executed by the control device 1010 can be realized by a so-called computer. The computer may load a program for controlling execution of the above-described processing, operate according to the read program, and execute the processing. The computer can load the program from a computer-readable recording medium storing the program.

  In the present embodiment, the camera 10 including the lens unit 120 and the camera body 130 is taken up as an example of the imaging apparatus. However, the imaging device is a concept including a camera body 130 that does not include the lens unit 120. The imaging device may be a lens interchangeable camera such as a single lens reflex camera, or may be a non-lens interchangeable camera. The imaging device may be a video camera. The imaging device is a concept including various devices having an imaging function, such as a mobile phone with an imaging function and a portable information terminal with an imaging function.

  As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the above-described embodiment. It is apparent from the scope of the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.

  The order of execution of each process such as operations, procedures, steps, and stages in the apparatus, system, program, and method shown in the claims, the description, and the drawings is particularly “before” or “prior to”. It should be noted that the output can be realized in any order unless the output of the previous process is used in the subsequent process. Regarding the operation flow in the claims, the description, and the drawings, even if it is described using “first”, “next”, etc. for convenience, it means that it is essential to carry out in this order. It is not a thing.

DESCRIPTION OF SYMBOLS 10 Camera 12 Release button, 13 Multi selector, 14 Finder window, 20 Mirror unit, 21 Main mirror, 22 Sub mirror, 24 Penta prism, 25 Eyepiece optical system 30 Image sensor, 40 Focus detection element, 47 Operation input part, 51 Image processing , 52 Control unit, 53 Display unit, 56 External connection IF, 57 System memory, 58 SDRAM, 60 Display element, 71 Lens drive unit, 80 External memory, 90 Power supply unit 120 Lens unit, 130 Camera body 35, 45, 65 Reference position 300 Focus point 400 Line sensor 410 Light receiving element 411, 412 Center axis 420 Light receiving element 700 Viewfinder image, 710 mark, 720 Optical image 800 image, 810 mark 1000 Adjustment device, 1010 control device, 1020 Image device 1030 display device 1080 first finder images 1100,1300,1500,1600 beam 1110 focused point image 1120 line images 1150, 1160 shift amount 1210 focus point image 1220 line images 1250,1260 shift amount 1280 second finder images 1500 ray
1550, 1560 Deviation

Claims (12)

An image sensor that images a subject with light that has passed through an optical system;
A detection element that is provided at a position different from the imaging element and detects a focus state of the optical system;
An image pickup apparatus comprising: a position information recording unit that records information indicating a relative positional deviation between a corresponding position of the detection element and a position of the image pickup element in an image pickup surface of the image pickup element. The imaging apparatus according to claim 1, further comprising: an output control unit that outputs information indicating a focus adjustment target position based on the focus state in an image obtained by the imaging element in accordance with the position shift. The imaging apparatus according to claim 2, wherein the output control unit includes a display control unit that superimposes on the image and displays a mark indicating the focus adjustment target position at a position corresponding to the positional shift. The output control unit includes a recording control unit that records information corresponding to the positional deviation, indicating the focus adjustment target position in association with the image data obtained by the imaging device. The imaging device described. The element information recording part which records the information which identifies the said detection element provided in the position according to the said position shift which should be used for the detection of the said focus state among the said some detection elements is further provided. The imaging device according to any one of the above. A display element that displays a mark indicating a target position for focus adjustment based on the focus state, superimposed on an optical image formed by light that has passed through the optical system;
Focus adjustment is controlled based on the focus state of the detection element provided at a position optically corresponding to the position where the mark is displayed within the plane on which the optical image is formed among the plurality of detection elements. The imaging apparatus according to claim 1, further comprising a focus adjustment control unit. A mark indicating a target position for focus adjustment based on the focus state is superimposed on an optical image formed by light that has passed through the optical system, at a corresponding position of the detection element in a plane on which the optical image is formed. The imaging device according to any one of claims 1 to 5, further comprising a display control unit to be displayed. An image sensor that images a subject with light that has passed through an optical system;
A display element that displays information superimposed on an optical image formed by light that has passed through the optical system;
An image pickup apparatus comprising: a position information recording unit that records information indicating a relative position shift between a corresponding position of the display element and an image pickup element position within an image pickup surface of the image pickup element. The imaging device according to claim 8, wherein the display element displays a mark indicating a focus adjustment target position so as to be superimposed on the optical image. The focus adjustment based on a focus state of a detection element that detects a focus state of the optical system provided at a position optically corresponding to a position where the mark is displayed in a plane on which the optical image is formed. A focus adjustment control unit for controlling
The image pickup apparatus according to claim 9, further comprising: an output control unit that outputs information indicating the focus adjustment target position in an image obtained by the image pickup element according to the position shift. An imaging device adjustment method comprising: an imaging element that images a subject with light that has passed through an optical system; and a detection element that is provided at a position different from the imaging element and detects a focus state of the optical system,
A light receiving stage for receiving measurement light by a plurality of light receiving elements included in the detection element and a plurality of light receiving elements included in the imaging element;
Based on the position of the light receiving element that detects the measurement light among the plurality of light receiving elements included in the detection element and the position of the light receiving element that detects the measurement light among the plurality of light receiving elements included in the imaging element. Detecting a relative positional shift between the corresponding position of the detection element and the position of the imaging element in the imaging plane of the imaging element;
An adjustment method comprising: a recording step of recording information indicating the positional deviation in the imaging device. The imaging apparatus further includes a display element that displays a mark indicating a focus adjustment target position based on the focus state, superimposed on an optical image formed by light that has passed through the optical system,
The adjustment method is:
A detection step of detecting a relative positional deviation between the optical image formed by the measurement light and the position of the mark superimposed on the optical image formed by the measurement light;
Based on the positional shift detected in the detection step, the detection element is provided at a position optically corresponding to a position where the mark is displayed within a plane on which the optical image is formed, among the plurality of detection elements. A selection step of selecting the detection element as a detection element to be used for detecting the focus state;
The adjustment method according to claim 11, further comprising: recording, on the imaging device, information for identifying the detection element selected in the selection step.

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