JP5843457B2 - Imaging device - Google Patents

Description

  The present invention relates to an imaging apparatus having a function of correcting a focus position detected by phase difference AF.

  In focus position detection by phase difference AF, which has been conventionally used in many single-lens reflex cameras, there are cases where the correct focus position cannot be detected due to the influence of the light source at the time of shooting or the color and type of the subject.

  When such a problem occurs, it is conceivable to correct the in-focus position detected by the phase difference AF according to the use environment.

  In order to solve the above problem, Patent Document 1 has a function of correcting the in-focus position of phase difference AF (hereinafter referred to as calibration), and the environment at the time of calibration, for example, the light source, the color and type of the subject, and the use A lens or the like is detected, and a correction value including its environmental information is stored. During shooting, the environment is automatically detected, and the in-focus position is determined by a correction value that matches the environment.

  Patent Document 2 has a calibration mode, and detects two kinds of defocus information in the first wavelength range and defocus information in a narrower wavelength range. Then, focus control is performed based on the two defocus information, so that an appropriate correction value is used for focusing even when the light source has a different wavelength.

JP 2007-156304 A JP 2008-275712 A

  However, in Patent Document 1, it takes time because correction values are created in the same calibration mode in each environment.

  In Patent Document 2, since only correction corresponding to the change of the light source can be performed, correct correction is not always performed when various other factors are involved.

  At the time of such calibration, there are cases where the user wants to give priority to time over the accuracy of correction of the focus position of the phase difference AF. In such a case, the conventional calibration cannot satisfy the user's request.

  Therefore, an object of the present invention is to provide an imaging apparatus capable of selecting normal calibration and simple calibration in a shorter time than normal calibration.

In order to achieve the above object, an imaging apparatus according to an aspect of the present invention includes an imaging element that captures an image formed by an imaging optical system, and the imaging based on a contrast detection method based on an output signal from the imaging element. Contrast detection means for detecting the focus adjustment state of the optical system, phase difference detection means for detecting the focus adjustment state of the image pickup optical system by a phase difference detection method using a light beam from the image pickup optical system, and the image pickup optical system Is driven with the first driving width, focus detection is performed by the phase difference detection unit at a lens position where the contrast detection value by the contrast detection unit reaches a peak, and a correction value is calculated from the phase shift amount of the focus detection result. The first calibration mode and the lens that has the peak when the imaging optical system is driven with a second driving width that is larger than the first driving width. Performs focus detection by the phase difference detecting means in location, and the second calibration mode of calculating a correction value from the phase shift amount of the focal point detection results, and correcting means having, the operator, the first calibration either use a correction value calculated by the Deployment mode, or use a correction value calculated by the second calibration mode, and a control means for selectably displaying a previous Kiho positive means The correction is performed using the correction value calculated in the first calibration mode or the correction value calculated in the second calibration mode .

  According to the present invention, it is possible to provide an imaging apparatus capable of selecting normal calibration and simple calibration in a shorter time than normal calibration.

It is a calibration mode selection flowchart. It is a normal calibration flowchart. It is a figure of a ranging point selection screen. It is a temporary calibration flowchart. It is an AF correction data user selection flowchart. It is an AF correction data automatic selection flowchart. It is an AF correction data compatibility determination flowchart. FIG. 8A is a diagram of an AF correction data user selection screen. FIG. 8B is a diagram of a temporary calibration AF correction data selection screen. FIG. 8C is a diagram of a correction content display screen for temporary calibration AF correction data. FIG. 8D shows a warning display screen when there is no AF correction data. FIG. 8E is a diagram of a warning display screen when the AF correction data does not match the shooting conditions. It is a schematic sectional drawing of the digital single-lens reflex camera at the time of a mirror down. It is a schematic sectional drawing of the digital single-lens reflex camera at the time of mirror up. It is the perspective view seen from the front upper direction of the digital single-lens reflex camera. It is a rear view of a digital single-lens reflex camera. 10 is a temporary calibration flowchart according to the second embodiment. 12 is a reset flowchart when using temporary AF correction data according to the second embodiment.

Hereinafter, preferred embodiments of the present invention will be described in detail.
[Embodiment 1]
As a first embodiment of the present invention, a lens interchangeable digital single lens reflex camera system having a semi-automatic or fully automatic phase difference AF correction function (hereinafter referred to as calibration) using a contrast detection method will be described.

  9 and 10 are schematic cross-sectional views of the digital single-lens reflex camera according to the present embodiment, FIG. 11 is a perspective view of the camera front as seen from above, and FIG. 12 is a rear view of the camera.

  The imaging optical system 10 housed in the photographic lens 1 is composed of one or a plurality of lens groups, and the focal distance and the focus position can be changed by moving all or a part of them. .

  The lens driving unit 11 is a driving unit that adjusts the focus state (focus position) by moving all or part of the lenses constituting the imaging optical system 10.

  The lens state detection unit 12 is a detection unit that detects the focal length (zoom position) and the focus position of the imaging optical system 10.

  The lens control unit 13 is a control unit that controls the entire photographing lens 1 including the lens storage unit 14 configured by a ROM or the like.

  The contact 15 is a contact provided in the photographic lens 1 and the camera body 2, and various information is communicated and power is supplied through the contact 15 when they are attached to each other.

  On the upper surface of the camera body 2, a camera power switch 51 and a mode dial 53 for changing the shooting mode according to the shooting situation are arranged on the same axis. An electronic dial 54 that is rotated and used for selection / setting related to photographing is provided. Reference numeral 52 denotes a release switch which is a two-stage switch. The release switch 52 instructs the start of operations such as AF (autofocus) processing, AE (automatic exposure) processing, and AWB (auto white balance) processing when the first stroke (SW1) is turned on. Further, when the switch of the second stroke (SW2) is turned ON, the start of a series of release processing operations such as retraction of the main mirror 20, opening / closing of the shutter 23, imaging processing, and image recording in the memory is instructed.

  Reference numeral 55 denotes an unlock button that is pressed when the photographing lens 1 is detached from the camera body 2 to mechanically unlock the camera body 2 and the photographing lens 1.

  The main mirror 20 is composed of a half mirror and can be rotated according to the operating state of the camera. When observing the subject with the viewfinder, the main mirror 20 is obliquely installed in the photographing optical path, and the light flux from the photographing lens 1 is bent. It guides to the below-mentioned finder optical system (FIG. 9). Further, at the time of photographing or live view, the light beam from the photographing lens 1 is retracted from the photographing optical path and guided to the image sensor 24 described later (FIG. 10).

  The sub mirror 21 rotates together with the main mirror 20, and when the main mirror 20 is obliquely installed on the photographing optical path, the light beam transmitted through the main mirror 20 is bent and guided to an AF sensor 22 described later (FIG. 9). Further, at the time of photographing or live view, it rotates together with the main mirror 20 and retracts from the photographing optical path (FIG. 10).

  The AF sensor (phase difference detection means) 22 includes a secondary imaging lens, an area sensor composed of a plurality of CCDs or CMOSs, and the like, and detects the focus adjustment state of the imaging optical system by a known phase difference detection method. It is possible.

  The shutter 23 is provided for controlling incidence of a light beam from the photographing lens 1 to an image sensor 24 to be described later, and is normally closed (FIG. 9) and opened during photographing or live view (FIG. 10). )

  The image pickup device 24 includes a CMOS image sensor that picks up an image formed by the image pickup optical system and its peripheral circuits.

  The focus plate 30 is disposed on the primary imaging surface of the photographic lens 1, a Fresnel lens (condenser lens) is provided on the incident surface, and a subject image (finder image) is formed on the exit surface. The pentaprism 31 changes the finder optical path, and corrects the subject image formed on the exit surface of the focus plate 30 to an erect image.

  The eyepiece 32 is configured to adjust the diopter according to the user's eyes when the user looks through the viewfinder. A diopter adjustment knob 56 is rotated to move a part of the eyepiece lens 32 along the finder optical axis to change the diopter.

  Here, the optical system configured by the focus plate 30, the pentaprism 31, and the eyepiece lens 32 is referred to as a finder optical system.

  The AE sensor 33 is composed of a photodiode corresponding to each area in the multi-divided imaging area, and measures the luminance of the subject image formed on the exit surface of the focus plate 30.

  The mechanical control means 40 is a microcomputer (central processing unit; MPU) that performs control other than control related to image processing in camera control.

  The digital control means 41 is a memory controller (ICU) that performs various controls of image data. The digital control means 41 can use contrast-type focus detection means for detecting the focus adjustment state of the imaging optical system based on the contrast detection method based on the output signal from the image sensor and determining the in-focus position.

  The camera storage means 42 stores settings for performing various controls, adjustment data, and the like. Further, as will be described later, AF correction data and the like created during calibration can also be stored.

  The liquid crystal monitor 43 displays captured images and various types of shooting information.

  On the left side of the liquid crystal monitor 43, buttons 45 to 49 are provided in a vertical line. The button 45 is a MENU button for changing settings of various camera functions such as shooting and playback. The button 46 is an INFO. For checking the setting state of the camera being shot and switching the display of shooting information being played back. It is a button. The button 47 is a JUMP button for skipping and displaying an image during reproduction. The button 48 is a playback button for displaying a photographed image on the liquid crystal monitor 43. The button 49 has a function of an erasing button for erasing the image being reproduced. Further, when the JUMP button 47 is pressed when an image is not reproduced, a so-called live view mode is set, and image signals from the image sensor 24 are sequentially reproduced to display a moving image on the liquid crystal monitor 43.

  On the right side of the liquid crystal monitor 43, a cross key (selection means) 50 for selecting and setting the shooting conditions and selecting the display contents of the liquid crystal monitor 43 is provided. The cross key 50 is provided with an up button 50a, a down button 50b, a left button 50c, and a right button 50d for moving the cursor displayed on the liquid crystal monitor 43 in the vertical and horizontal directions. Each button is assigned another function when the cursor is not displayed on the liquid crystal monitor 43. For example, the upper button 50a can set ISO sensitivity for changing the sensitivity of light at the time of photographing. The lower button 50b is capable of selecting a white balance for adjusting the color temperature and setting white as a reference of the color included in the subject by the light source. The left button 50c is capable of selecting a photometric mode for changing the photometric method, such as evaluation, part, and center part emphasis. The right button 50d can select an AF mode for changing the AF operation characteristics in accordance with the state of the subject.

  At the center of the cross key 50, a SET button 50e is provided for setting contents when changing the setting of the camera function. Further, when the SET button 50e is pressed during the live view, the moving image recording is started, and when the SET button 50e is pressed again, the moving image recording is stopped. The SET button 50e has a role of determining the item of the moved cursor. For example, when a SET display is displayed on the liquid crystal monitor 43, an operation such as determination or selection can be performed by selecting the SET display with the SET button 50e. Further, when the cancel display is displayed on the liquid crystal monitor 43, an operation such as returning to the previous state or ending a specific mode can be performed by selecting the cancel display with the SET button 50e.

  The digital control means 41 is provided with a calculation means for calculating a difference value between the output by the contrast detection method and the mechanical control means 40 for controlling the output from the AF sensor 22. The difference amount calculated by the calculation means is stored in the camera storage means 42 as correction information. The camera system according to the present embodiment is configured to be able to set a calibration mode for calculating and storing the correction information described above. Here, the correction information is calculated by the digital control means 41, but the mechanical control means 40 may be used.

  Hereinafter, a flow for performing calibration will be described with reference to FIGS. 1, 2, 3, and 4.

  FIG. 1 is a flow for selecting a calibration mode.

  First, the MENU button 45 is operated to display a menu on the liquid crystal monitor 43. Next, the calibration mode is selected (S101, S102). Here, there are a normal calibration mode (S103) and a temporary calibration mode (S104). When the user selects an arbitrary mode, the calibration mode is executed.

  FIG. 2 is a flow of the normal calibration mode (first calibration mode).

  When the normal calibration mode is started, a screen as shown in FIG. 3 is displayed on the liquid crystal monitor 43 (S105).

  In FIG. 3, 61 is a message to the user, 62 is a display indicating that the up / down / left / right buttons 50a to 50d of the cross key 50 are used for moving the distance measuring point, and 63 is a SET button for determining the distance measuring point. This is a SET display indicating that 50e is used. Reference numeral 64 is a display of selectable distance measuring points, and 65 is a display of the currently selected distance measuring point, which highlights the color and shape.

  While viewing this screen, the user operates the up / down / left / right buttons 50a to 50d of the cross key 50 to select a distance measuring point, and presses the SET button 50e to confirm the selection of the distance measuring point (S106).

  When the distance measuring point is determined, an instruction to align the selected distance measuring point with the subject on the liquid crystal monitor 43 and live view display start (S107).

  In response to the instruction, the user sets a distance measuring point on an appropriate subject (S108).

  When the distance measuring point is set to the subject, the SET button 50e is pushed to proceed to the next (S109). If not, the process returns to S108 and is repeated until the distance measuring point is matched with the subject.

  When the SET button 50e is pressed, TVAF is executed and the subject is focused (S110).

  From that position, the imaging optical system 10 is driven by the lens driving means 11, and the in-focus position is shifted by a certain amount toward the closest side (S111).

  From that position, the imaging optical system 10 is finely driven to the infinite side by the lens driving means 11 (S112). By this minute driving, a slight focus shift can be corrected.

  After the imaging optical system 10 is driven, the peak of the contrast detection value is detected by the digital control means 41 (S113). At this time, in order to calculate the peak position of the contrast, the peak position must be exceeded once due to the characteristics of contrast AF. If it is determined that the peak position is not exceeded, the imaging optical system 10 is again finely driven to the infinity side.

  If it is determined that the contrast peak position has been exceeded, the driving of the imaging optical system 10 is stopped (S114). At this time, the peak position of the contrast is calculated from the contrast data obtained during the minute driving by calculation.

  At the lens position beyond the contrast peak position, the AF sensor 22 performs distance measurement using the phase difference AF (S115).

  The amount of focus deviation between the just focus position measured by the phase difference AF in S115 and the contrast peak position detected by TVAF is calculated as AF correction data (S116).

  A method for calculating AF correction data will be described below. First, the just focus position of the phase difference AF is calculated from the data measured by the AF sensor 22 in S115 (focus detection result of the AF sensor 22). Next, a difference from the contrast peak position calculated in S114 is calculated. The difference is used as AF correction data.

  When the AF correction data can be calculated, the correction amount is assisted displayed on the liquid crystal monitor 43 (S117).

  The user determines actual AF correction data with reference to the correction amount (S118).

  The determined AF correction data is stored in the camera storage means 42 as AF correction data in normal calibration (S119). This completes the normal calibration mode.

  Next, the temporary calibration mode (second calibration mode) will be described with reference to FIG. When the temporary calibration mode is selected at the time of selecting the calibration mode in FIG. 1 (S104) and the temporary calibration mode starts, an instruction to align the center distance measuring point with the subject on the liquid crystal monitor 43 and the live view are displayed. The display starts (S120).

First, the user aligns the center distance measuring point with an appropriate subject as instructed on the display screen (S12).
1) Press the SET button 50e to proceed (S122). If not, the process returns to S121 and repeats until the distance measuring point is matched with the subject.

  When the SET button 50e is pressed, TVAF is executed and the subject is focused (S123). In the normal calibration, the imaging optical system 10 is subsequently finely driven. However, in the temporary calibration, the calibration is performed quickly without taking time due to the nature of the function, so that only the normal focus adjustment is performed. Here, in the micro drive performed in the normal calibration, the imaging optical system 10 is driven with the first drive width, whereas in the normal focus adjustment, the image is captured with the second drive width that is larger than the first drive width. The optical system 10 is driven. Therefore, the temporary calibration can be performed in a shorter time and simpler than the normal calibration. In this embodiment, the permissible circle of confusion δ is 0.010 [mm], the first drive width value is Fδ, and the second drive width value is 2Fδ. However, the present invention is not limited to this. Is not to be done.

  Distance measurement using phase difference AF is performed at the in-focus position in TVAF (S124).

  The difference between the in-focus position in the TVAF executed first and the distance measurement focus position in the phase-difference AF executed later is calculated as AF correction data (S125).

  From the calculation result, a correction value of another distance measuring point (here, a distance measuring point other than the center) is calculated (S126). The AF correction data of other distance measuring points is obtained from the image height of the distance measuring point, aberration information of the photographing lens 1 being used, and the like.

  Since it is stored as AF correction data for temporary calibration, it is displayed on the liquid crystal monitor 43 so as to give an arbitrary name (S127).

  When the user names the AF correction data, the supplemental information is stored in the camera storage unit 42 in association with the AF correction data, such as the condition for calculating the temporary calibration correction value (S128). This completes the temporary calibration.

  During the calibration, the liquid crystal monitor 43 displays the current state, the next means, etc., so that the user can operate without hesitation.

  In addition, although the above temporary calibration is described as being performed at the central distance measuring point, the user may select the distance measuring point in advance as in S105 and S106 of normal calibration.

  Hereinafter, how to use the actually set AF correction data will be described with reference to FIGS. 5, 6, 7, and 8 (a) to 8 (e).

  FIG. 5 is a flowchart for explaining how the user selects the AF correction data for the normal calibration and the AF correction data for the temporary calibration that have been set.

  First, the user selects whether to use AF correction data (S701).

  When AF correction data is used and AF correction data has already been created (S702), the user selects AF correction data (S703, FIG. 8A).

  FIG. 8A is a user selection screen for AF correction data displayed on the liquid crystal monitor 43.

  Reference numeral 601 denotes a title display for displaying that the screen is for selecting AF correction data. Reference numeral 602 displays the photographing lens 1 attached to the camera, and indicates that it is a selection screen for selecting which AF correction data is used by the lens.

  Reference numerals 603, 604, and 605 are tabs for selecting data. In FIG. 8A, the tab frame of temporary calibration data (in the screen display, abbreviated as temporary CAL data) is highlighted and selected. It shows that. By pressing the SET button 50e, the selection is confirmed, and the screen transitions to the screen of FIG.

  In addition, here, when there is data for which the AF correction data is not set among the normal calibration data and the temporary calibration data, the display is grayed out and cannot be selected. The data is selected by pressing the upper button 50a or the lower button 50b to select one of the selection items and pressing the SET button 50e to confirm the selection.

  FIG. 8B is a screen display of the liquid crystal monitor 43 when the user selects temporary calibration data on the AF correction data user selection screen of FIG.

  Reference numeral 606 denotes a title display for displaying that the screen is for selecting temporary calibration data. In this example, four temporary calibration AF correction data are registered.

  Reference numerals 607 to 610 display titles of four AF correction data. In the display example, the tab frame of the temporary calibration AF correction data titled “Y Stadium Mound” 609 is highlighted to indicate that it is selected. By pressing the SET button 50e in this state, the selection is confirmed and the screen transitions to the screen of FIG.

  FIG. 8C is a screen that displays the correction contents of the selected temporary calibration AF correction data.

  Reference numeral 611 denotes a title display of the selected temporary calibration AF correction data. Reference numeral 612 denotes a lens name to be corrected. Reference numeral 613 denotes a photographing condition when temporary calibration AF correction data is created. The focal length of the lens, the type of light source, the brightness, the distance measuring point to be corrected, the focus position to be corrected, and the set position. Information etc. are displayed.

  An actual correction amount 614 is displayed on a scale. In the example of FIG. 8C, the focus correction is performed by 6 micrometers in the rear pin direction on the imaging surface after focusing on the phase difference AF at the infinite focus end position. Shows you to do.

  Reference numeral 615 denotes a cancel display, which can be returned to the previous screen (FIG. 8B) by confirming the selection by operating the SET button 50e.

  Reference numeral 616 denotes a SET display, and the setting can be completed with the contents displayed on the liquid crystal monitor 43 by confirming the selection by operating the SET button 50e.

  Subsequently, when there is no AF correction data in S702, a warning is displayed (S712), and the user selects whether to create AF correction data or to perform shooting without AF correction data (FIG. 8D). ).

  FIG. 8D shows a warning display when there is no corresponding AF correction data in the camera although the user has set to use AF correction data in S701.

  Reference numeral 617 indicates that there is no AF correction data. When each of the tabs 618, 619, and 620 is selected, an AF sequence that does not use the AF correction data, that is, only a so-called phase difference AF is performed in 618. If 619 is selected, the mode shifts to a mode for newly creating normal calibration data. If 620 is further selected, the mode shifts to a mode for newly creating temporary calibration data. In FIG. 8D, the tab frame 618 is highlighted to indicate that it is selected.

  Subsequently, when automatic selection of AF correction data is selected (S704), an AF correction data automatic selection routine described later is entered (S720). If automatic selection is not selected, the process waits until the switch SW1 of the release switch 52 is turned on (S705). If it is turned on, an AF correction data compatibility determination routine described later is entered (S730).

  Although details of the AF correction data automatic selection routine will be described later, when the camera has AF correction data optimal for the shooting conditions, the camera automatically selects the optimal AF correction data.

  Although details of the AF correction data suitability determination routine will be described later, it is determined whether the AF correction data selected by the user is compatible with the actual shooting conditions.

  Subsequently, distance measurement by phase difference AF is started (S706), and the focus lens of the photographing lens 1 is driven by a predetermined amount based on distance measurement information (S707). Here, the currently set AF correction data information may be displayed on the liquid crystal monitor 43 or in the viewfinder display inside the eyepiece 32.

  If it is determined that the subject is in focus (S708), the focus lens of the photographing lens 1 is driven by the AF correction data selected from the in-focus position (S709) and waits until the SW2 of the release switch 52 is turned on (S710). ).

  When the switch SW2 of the release switch 52 is turned on, a series of photographing operations such as retraction of the main mirror 20, opening and closing of the shutter 23, imaging processing, and image recording in the memory are performed (S711).

  When this image is recorded, the used AF correction data may be written in the maker note area of the EXIF of the image.

  If the user selects not to use AF correction data in S701, a normal photographing operation using phase difference AF is performed.

  First, it is determined whether or not SW1 of the release switch 52 is turned on (S713). If it is turned on, distance measurement by phase difference AF is started (S714).

  Based on distance measurement information by phase difference AF, the focus lens of the photographing lens 1 is driven by a predetermined amount (S715).

  If it is determined that the subject is in focus (S716), the process waits until SW2 of the release switch 52 is turned on (S710).

  FIG. 6 is a flowchart when the AF correction data is set to automatic selection (S720).

  First, it is determined whether or not SW1 of the release switch 52 is turned on (S721), and if it is turned on, it is determined whether or not the AF correction data stored in the camera is suitable for the current shooting state of the camera (S721). S722). Judgment items include focal length, focus position, light source type, light source brightness, selected distance measuring point, shooting location, time, etc. It is determined whether the AF correction data being saved is stored.

  It is determined whether or not there is suitable AF correction data (S723), and if there is, suitable AF correction data is selected (S724), and the process returns to S706 in FIG.

  If there is no suitable AF correction data, the AF correction data is not selected (S725), the fact that there is no suitable correction data is displayed (S726), and the normal phase difference AF is automatically selected. Then, the process proceeds to 1 in a circle in FIG.

  Alternatively, a warning display as shown in FIG. 8E described later may be performed in S726 so that the user can select new AF correction data. In this case, AF correction data may be created in advance in the temporary calibration mode for the purpose of shortening the calibration time.

  FIG. 7 is a flowchart for determining in step S730 whether the AF correction data selected by the user matches the actual shooting conditions.

  First, it is determined whether or not the AF correction data selected by the user is compatible with the current camera shooting state (S731). The determination items are the focal length, focus position, light source type, light source brightness, selected distance measuring point, shooting location, time, etc., as in the AF correction data automatic selection routine of S722. Judgment is made in combination.

  If it is determined that the AF correction data is compatible (S732), the process proceeds to S706 in FIG.

  If it is determined that it does not match, a warning display (S733, FIG. 8 (e)) is performed. Here, the warning is displayed on the liquid crystal monitor 43, but a warning by sound or light may be used.

  FIG. 8E shows a warning display when the AF correction data does not match.

  Reference numeral 621 displays that the AF correction data does not match, and allows the user to select one of the tabs 622, 623, and 624, and determines the subsequent operation.

  When 622 is selected, the process shifts to an AF sequence that does not use AF correction data, that is, a so-called phase difference AF only focusing operation (circled 1 in FIG. 5).

  If 623 is selected, the process proceeds to creation of normal calibration data (S103 in FIG. 1).

  If 624 is selected, the process proceeds to the creation of temporary calibration data (S104 in FIG. 1). In FIG. 8E, the temporary calibration data creation tab is selected (the tab frame is highlighted), and the process proceeds to temporary calibration data creation by pressing the SET button 50e.

  From this selection screen, the routine proceeds to a routine (S703 in FIG. 5) for reselecting other stored AF correction data, or the current AF correction data determined to be incompatible is used as it is. You may make it selectable.

  In the description so far, the AF correction data is manually selected and created. However, when a certain time has elapsed or no clear selection has been made by the user, the normal calibration AF correction data or the temporary calibration AF correction data may be automatically set. For example, if AF correction data suitable for the shooting condition (shooting environment) of the place where the user is present is stored in the storage means 42, the AF correction data is automatically set. Further, when the shooting conditions are changed, if AF correction data suitable for the changed shooting conditions is stored in the storage means 42, the AF correction data is automatically changed to the AF correction data. May be. In addition, the AF correction data may be changed / set after a certain period of time so that the user can select what AF correction data is automatically set in advance.

  In the description so far, when performing calibration, the normal calibration mode and the temporary calibration mode are manually selected. However, for example, the mechanical control unit 40 automatically selects the temporary calibration mode in a place where the brightness of the light source is higher than a predetermined value and the luminance is high, and the normal calibration mode is set in a place where the brightness is lower than the predetermined value. You may be comprised so that it may select automatically. In a place where the luminance is high, the accuracy of the normal calibration and the accuracy of the temporary calibration hardly change. Therefore, the time can be reduced by using the temporary calibration.

  In addition, when a GPS function (current position detection means) that can acquire the current position is attached as an accessory, the normal calibration mode is automatically selected when the current position is within a predetermined range. Also good. Further, the temporary calibration mode may be automatically selected when the current position is outside a predetermined range (calibration is performed at a place away from a certain arbitrary range).

  Further, the normal calibration mode may be automatically selected when the type of the light source is a predetermined wavelength, and the temporary calibration mode may be automatically selected when the light source is other than the predetermined wavelength.

  Further, the normal calibration mode may be automatically selected if the outside air temperature is within a predetermined temperature, and the temporary calibration may be automatically selected if the outside air temperature is other than the predetermined temperature.

  Further, for example, by using the AE sensor 33 in FIG. 9 as a sensor capable of recognizing an image like the image sensor 24, detection of a subject that is a subject to be photographed at the time of distance measurement by phase difference AF (subject detection function) ) Becomes possible. Thereby, in the temporary calibration mode described so far, in addition to the AF correction data for each photographing environment, it is also possible to create AF correction data for each subject (such as the color and shape of the subject).

As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to these embodiment, A various deformation | transformation and change are possible within the range of the summary.
[Embodiment 2]
As a second embodiment of the present invention, a lens interchangeable digital single-lens reflex camera system having a semi-automatic or fully automatic phase difference AF correction function (hereinafter referred to as calibration) using a contrast detection method will be described.

  Hereinafter, temporary calibration different from that of the first embodiment will be described with reference to FIGS. Note that the outline of the digital single-lens reflex camera in the present embodiment is almost the same as that of the first embodiment, and therefore only different parts will be described. Further, S120 to S126 in the temporary calibration flowchart of FIG. 4 of the first embodiment are performed in the same manner, and the subsequent processing is the flowchart shown in FIG.

  When the AF correction data is calculated in S126 of FIG. 4, it is determined whether or not to perform the storing operation immediately (S201).

  If the data is to be saved immediately, an arbitrary data name is input (S202), and the AF correction data with that name is saved in the camera storage means 42 (S203).

  Thereafter, 1 is set to a flag i indicating that the current AF correction data has been saved (S204), and the temporary calibration is terminated.

  If it is determined in S201 that the data is not stored immediately, the flag i is set to 0, the AF correction data is stored in a RAM (temporary storage means) (not shown) (S205), and the temporary calibration is terminated. The AF correction data stored in the RAM is stored as long as the camera is turned on, but is erased when the power is turned off. Therefore, it is necessary to continue to execute the flowchart of FIG.

  After S204 or S205, photographing is performed, and when photographing is completed or AF correction data is changed / reset, the reset flowchart when using temporary AF correction data shown in FIG. 14 is executed.

  First, a warning for resetting / changing the AF correction data is displayed on the liquid crystal monitor 43 (S211).

  Next, it is determined whether or not the AF correction data storage completion flag i is 0 (S212). If the flag i is 0, the storage has not been completed, and the process proceeds to the next step (S213). If the flag i is 1 and the storage has been completed, the resetting / changing of the AF correction data is terminated. When the AF correction data is reset / changed, the flag i remains 1 so that the saving step is not performed again.

  If it is determined that the flag i is 0, it is determined whether to save the current AF correction data (S213).

  If the user determines to save, an arbitrary data name is input (S214), and is saved in the camera storage means 42 as AF correction data for temporary calibration (S215).

  When the saving is completed, the flag i is set from 0 to 1 (S216). After the completion of saving, the resetting / changing of the correction value is completed.

  If it is determined in S213 that the user does not save the current correction value, the temporary AF correction data is erased from the RAM (S217), and the reset / change of the AF correction data ends.

  By implementing the above flow, it is effective when you want to create and use AF correction data when you are in a hurry, or when you want to determine whether to use several created AF correction data before saving them. .

  As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to these embodiment, A various deformation | transformation and change are possible within the range of the summary.

  According to the above embodiment, the following effects can be obtained.

  In the first embodiment, by mounting a temporary calibration function that can acquire AF correction data in a shorter time than normal calibration, it is troublesome to correct the amount of defocus due to changes in the shooting environment such as the light source. Can be done quickly. Furthermore, the AF correction data can be saved together with information such as name, correction value, and shooting environment, and can be recalled as necessary. The stored AF correction data allows the camera to detect the shooting environment and automatically call up appropriate AF correction data.

  Further, by setting AF correction data for each subject using subject detection, it is possible to correct a focus shift due to the color or shape of the subject.

  In the second embodiment, the AF correction data can be saved at the timing of changing or resetting the AF correction data, such as after shooting, when it is desired to use the temporary AF correction data promptly, to make a decision after using it for a trial.

  According to the present invention, it is possible to provide an imaging apparatus capable of switching the calibration function according to the user's request.

DESCRIPTION OF SYMBOLS 1 Shooting lens 2 Camera main body 10 Imaging optical system 22 AF sensor 24 Imaging device 42 Camera storage means 64 AF ranging point 65 Selected ranging point 604 Normal calibration data 605 Temporary calibration data 609 Name of AF correction data S103 Normal calibration mode S104 Temporary calibration mode

Claims (9)

An image sensor for imaging an image formed by the imaging optical system;
Contrast detection means for detecting a focus adjustment state of the imaging optical system by a contrast detection method based on an output signal from the imaging element;
A phase difference detection means for detecting a focus adjustment state of the imaging optical system by a phase difference detection method using a light beam from the imaging optical system;
The imaging optical system is driven with a first driving width, focus detection is performed by the phase difference detection unit at a lens position where the contrast detection value by the contrast detection unit reaches a peak, and correction is performed from the phase shift amount of the focus detection result. A first calibration mode for calculating a value, and focus detection by the phase difference detection means at a lens position where the peak is obtained by driving the imaging optical system with a second driving width larger than the first driving width. And a second calibration mode for calculating a correction value from the amount of phase shift of the focus detection result ,
Control means for allowing an operator to selectably display whether the correction value calculated in the first calibration mode or the correction value calculated in the second calibration mode is used;
Have
Before Kiho positive means, the correction value is calculated by the first calibration mode, or imaging device and performs the correction using the correction value calculated by the second calibration mode.   The imaging apparatus according to claim 1, further comprising a storage unit capable of storing the correction value and the photographing condition for which the correction value is calculated in association with each other. Before Kiho positive means, when the imaging conditions when changing the correction value suitable for the changed image capturing conditions are stored in the storage means, and characterized in that changes the correction value The imaging device according to claim 2. A sensor having a subject detection function;
The imaging apparatus according to claim 2, wherein the storage unit is capable of storing a subject to be imaged and the correction value in association with each other.   5. A selection means capable of selecting whether or not to save the correction value before photographing when the correction value is calculated in the second calibration mode. The imaging device according to any one of the above.   The first calibration mode is automatically selected when the brightness of the light source is less than or equal to a predetermined value, and the second calibration mode is automatically selected when the brightness of the light source is greater than the predetermined value. The imaging apparatus according to claim 1, further comprising a control unit that performs the control. Having a current position detecting means capable of acquiring a current position of the imaging device ;
Control that automatically selects the first calibration mode when the current position is within a predetermined range, and automatically selects the second calibration mode when the current position is outside the predetermined range. The imaging apparatus according to claim 1, further comprising means.   Control that automatically selects the first calibration mode when the wavelength of the light source is a predetermined wavelength, and automatically selects the second calibration mode when the wavelength of the light source is other than the predetermined wavelength The imaging apparatus according to claim 1, further comprising means.   Control means for automatically selecting the first calibration mode when the outside air temperature is within a predetermined temperature and automatically selecting the second calibration mode when the outside air temperature is other than the predetermined temperature. The imaging apparatus according to claim 1, further comprising: