JP2007248852A - Focusing device for camera - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a focusing device capable of performing a highly precise focusing by correcting a focus error made because of the difference of optical path length between an imaging device for photography and an imaging device for live-view display when performing focusing by climbing AF or the like by using the imaging device for light-view display. <P>SOLUTION: An imaging signal is obtained from an object luminous flux passing through a photographic lens 11 by the imaging device for photography 67, and the object luminous flux is reflected in a photographing optical path by a first reflection mirror 51. An imaging signal is obtained from the object luminous flux reflected by the first reflection mirror 51 by the imaging device for display 61, and the focusing operation is performed by a lens driving mechanism 13 based on the imaging signal. The difference of optical path length between the imaging device for photography 67 and the imaging device for display 61 is stored in a non-volatile memory 88, and is corrected by a B μcom 80 and an L μcom 15 based on output from the non-volatile memory 88 after the focusing is performed. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a camera focus adjustment device, and more particularly to a camera focus adjustment device that performs a focusing operation using an image pickup signal of an image pickup device for live view display with high accuracy.

Conventionally, a digital camera in which a subject image formed by a photographing optical system such as a photographing lens is photoelectrically converted by an image pickup device and displayed on an image display device such as a liquid crystal monitor based on an image signal obtained thereby is generally used. Known. As a camera for displaying such a subject image, there is known a camera in which a half mirror is disposed in a finder optical system and a subject luminous flux is guided to an image pickup device for live view display (see, for example, Patent Document 1).
JP 2000-165730 A

  However, the following problem occurs in Patent Document 1 described above. In other words, when focusing using a focus method such as hill-climbing AF using an image sensor for live view display, the optical error is different between the image sensor for display and the image sensor for shooting. There is a problem that it occurs.

  Further, when focus adjustment is performed by manual focus (MF) while observing a live view display by an image sensor for live view display, there is a problem that an image of the image display device is rough and an error in focusing is large.

  Further, even when accurate focusing is performed with MF, there is a problem that an error in the difference in optical path length between the image sensor for display and the image sensor for photographing is included as described above.

  Therefore, the present invention has been made in view of the above circumstances, and the purpose of the present invention is to use an imaging device for photographing when focusing using a focusing method such as hill-climbing AF using an imaging device for live view display. It is to provide a high-precision camera focus adjustment device by correcting the occurrence of a focus error due to the difference in optical path length.

  Further, the object of the present invention is based on the focusing error that occurs due to the coarse image on the image display device and the difference in the optical path length from the imaging device when the live view display is observed and focusing is performed by MF. It is to remove the error and perform highly accurate focus adjustment.

  A further object of the present invention is to improve the usability when performing focusing while observing a live view display.

  That is, the invention described in claim 1 is capable of moving back and forth with respect to the first imaging means for obtaining an imaging signal from the subject luminous flux that has passed through the imaging lens, and the imaging optical path of the first imaging means. Inside, a movable mirror that reflects the subject luminous flux, a second imaging means that obtains an imaging signal from the subject luminous flux reflected by the movable mirror, and an image obtained by the first or second imaging means. In a camera having a display means capable of displaying a signal, an imaging signal focus adjustment means for performing a focus adjustment operation based on an imaging signal of the second imaging means, the first imaging means, and a second imaging means Storage means for storing the optical path length difference of the imaging means, correction means for correcting a difference in optical path length between the first imaging means and the second imaging means based on the output of the storage means, and the imaging signal focus adjustment By means After the point regulation is performed, characterized by comprising a control means for correcting by the correction means.

  According to a second aspect of the present invention, in the first aspect of the present invention, the camera further includes a plurality of focus detection areas, and the storage means stores the first focus according to the focus detection area. The optical path length difference between the imaging means and the second imaging means is stored, and the correction means is based on the output of the storage means corresponding to the focus detection area, and the first imaging means and the second imaging means. The optical path length difference is corrected.

  According to a third aspect of the present invention, in the invention according to the first or second aspect, the control means, after the display means finishes displaying the image signal acquired by the second imaging means, Control is performed so that correction is performed by the correction means.

  According to a fourth aspect of the present invention, there is provided a first imaging unit that acquires an imaging signal from a subject luminous flux that has passed through a photographic lens, and is capable of advancing and retreating with respect to the imaging optical path of the first imaging unit. In this case, the movable mirror that reflects the subject luminous flux, the second imaging means that obtains the imaging signal from the subject luminous flux reflected by the movable mirror, and the image signal obtained by the first or second imaging means. In a camera having a display means capable of displaying, a manual focus adjustment means for driving a focus lens based on an operation of a manual operation member, a phase difference focus adjustment means for performing focus adjustment by a phase difference detection method, Control means for controlling the focus adjustment by the phase difference focus adjustment means after the focus adjustment by the manual focus adjustment means. To.

  According to a fifth aspect of the present invention, in the invention according to the fourth aspect, the control means performs the above operation after the display means finishes displaying the image signal acquired by the second imaging means. Control is performed so that the focus adjustment is performed by the phase difference focus adjustment means.

  The invention according to claim 6 is capable of advancing and retreating with respect to the imaging optical path of the first imaging means, the first imaging means for acquiring an imaging signal from the subject light flux that has passed through the imaging lens, and within the imaging optical path. In this case, the movable mirror that reflects the subject luminous flux, the second imaging means that obtains an imaging signal from the subject luminous flux reflected by the movable mirror, and the image signal obtained by the first or second imaging means. And a display unit capable of displaying the image signal acquired by the second imaging unit, the manual focus adjustment unit driving the focus lens based on the operation of the manual operation member. In this case, the operation of the manual focus adjusting means is prohibited.

  According to a seventh aspect of the present invention, there is provided a first imaging unit that acquires an imaging signal from a subject luminous flux that has passed through a photographing lens, and is capable of moving back and forth with respect to the photographing optical path of the first imaging unit. In this case, the movable mirror that reflects the subject luminous flux, the second imaging means that obtains the imaging signal from the subject luminous flux reflected by the movable mirror, and the image signal obtained by the first or second imaging means. A display means capable of displaying the image, and a manual focus adjusting means for driving the focus lens based on an operation of the manual operation member, and a focus aid display means for displaying whether the focus is achieved. When displaying the image signal acquired by the second imaging means, the focus aid display operation is prohibited when the manual focus adjustment means is operated. That.

  The invention according to claim 8 is capable of advancing and retreating with respect to the imaging optical path of the first imaging means for acquiring the imaging signal from the subject luminous flux that has passed through the imaging lens, and the imaging optical path of the first imaging means. In this case, the movable mirror that reflects the subject luminous flux, the second imaging means that acquires the imaging signal from the subject luminous flux reflected by the movable mirror, and the focus adjustment operation based on the imaging signal of the second imaging means Focusing means for performing the above, storage means for storing the optical path length difference between the first imaging means and the second imaging means in advance, and correcting means for correcting the optical path length difference stored in the storage means And control means for controlling the correction means to correct the optical path length difference after the focus adjustment operation is performed by the focus adjustment means.

  According to a ninth aspect of the present invention, in a camera focus adjustment apparatus having a plurality of focus detection areas in a shooting screen, the first imaging means for acquiring an imaging signal from a subject luminous flux that has passed through a shooting lens; A second mirror that can move back and forth with respect to the imaging optical path of the first imaging means and that obtains an imaging signal from a movable mirror that reflects the subject luminous flux in the imaging optical path and a subject luminous flux reflected by the movable mirror. Imaging means, a focus adjusting means for performing a focus adjustment operation based on an imaging signal of the second imaging means, and optical paths of the first imaging means and the second imaging means according to the plurality of focus detection areas The focus adjustment operation was performed by the storage means storing the length difference, the correction means for correcting the optical path length difference based on the output of the storage means corresponding to the focus detection area, and the focus adjustment means. In, characterized by comprising a control means for controlling so as to correct the optical path length difference by the correction means.

  According to a tenth aspect of the present invention, in the invention according to the eighth or ninth aspect, the control means, after the display means finishes displaying the image signal acquired by the second imaging means, Control is performed so that correction is performed by the correction means.

  The invention according to claim 11 is capable of advancing and retreating with respect to the imaging optical path of the first imaging means for obtaining an imaging signal from the subject luminous flux that has passed through the imaging lens including the focus lens, and the first imaging means, In the photographing optical path, a movable mirror that reflects a subject light beam, a second imaging unit that obtains an imaging signal from the subject light beam reflected by the movable mirror, and the focus lens based on a manual operation of a photographer A manual focus adjustment means for driving the phase difference, a phase difference focus adjustment means for adjusting the focus by the phase difference detection method, and after the focus adjustment is performed by the manual focus adjustment means, the focus adjustment is performed by the phase difference focus adjustment means. Control means for controlling the display and display means capable of displaying an image corresponding to the imaging signal acquired by the first or second imaging means. Characterized in that it Bei.

  The invention according to a twelfth aspect is the invention according to the eleventh aspect, wherein the control means is configured to display the image corresponding to the imaging signal acquired by the second imaging means by the display means. Control is performed so that focus adjustment is performed by the phase difference focus adjustment means.

  According to a thirteenth aspect of the present invention, the first imaging unit that acquires an imaging signal from a subject light beam that has passed through a photographing lens including a focus lens and the photographing optical path of the first imaging unit can move forward and backward. In the photographing optical path, the movable mirror that reflects the subject light beam, the second imaging means that obtains an imaging signal from the subject light beam reflected by the movable mirror, and the first or second imaging means. Display means capable of displaying an image corresponding to the captured image signal, manual focus adjusting means for driving the focus lens based on a manual operation of the photographer, and corresponding to the image signal acquired by the second image capturing means. And a control means for controlling to prohibit the operation of the manual focus adjusting means when displaying an image.

  The invention according to claim 14 is capable of advancing and retreating with respect to the imaging optical path of the first imaging means that obtains an imaging signal from the subject luminous flux that has passed through the imaging lens including the focus lens, and the first imaging means, Acquired by the movable mirror for reflecting the subject luminous flux in the photographing optical path, the second imaging means for obtaining an imaging signal from the subject luminous flux reflected by the movable mirror, and the first or second imaging means. Display means capable of displaying an image corresponding to the captured image signal, manual focus adjustment means for driving the focus lens based on a manual operation of the photographer, and whether or not focus adjustment by the manual focus adjustment means is in focus When the image corresponding to the imaging signal acquired by the focus imaging display means for displaying the image and the second imaging means is displayed, the manual focus adjustment means is activated. Characterized by comprising a control means for controlling so as to prohibit the display operation of the focus aid display means when.

  According to the present invention, in a camera capable of displaying a live view image, when performing focusing with a focus method such as hill-climbing AF using an image sensor for live view display, Since the difference in optical path length is corrected, it is possible to perform highly accurate focus adjustment.

  Further, according to the present invention, when observing the live view display and performing focus adjustment by MF, the phase difference type focus adjustment is performed after the MF is completed, so that the focus adjustment that occurs because the image of the image display device is rough is performed. It is possible to perform high-precision focus adjustment by removing errors and errors due to optical path length differences from the imaging device.

  Furthermore, according to the present invention, when performing live view display, focusing by MF is prohibited, and a focusing operation that is difficult to obtain focusing accuracy is not performed, so that it is possible to improve usability.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1 shows a first embodiment of the present invention and is an external perspective view showing a configuration of a single-lens reflex type digital camera to which a focus adjustment device of the present invention is applied.

  In FIG. 1, this single-lens reflex digital camera (hereinafter abbreviated as “camera”) 1 is mainly composed of a lens barrel 10 as an interchangeable lens and a camera body 30. A desired lens barrel 10 is detachably set with respect to the front surface.

  On the upper surface of the camera body 30, a release button 31, a mode dial 32, a power switch lever 33, a control dial 34, and the like are provided.

  The release button 31 is a button for executing a shooting preparation operation and an exposure operation. The release button 31 is composed of a two-stage switch of a first release switch and a second release switch. When the release button 31 is pressed halfway, the first release switch is turned on to perform photometric processing or Shooting preparation operations such as distance measurement processing are executed. Further, when the release button 31 is fully pressed, the second release switch is turned on and the exposure operation is executed.

  The mode dial 32 is an operation member for setting a shooting mode at the time of shooting. When the mode dial 32 is rotated in a predetermined direction, a shooting mode at the time of shooting is set. The present embodiment also has a function of switching an image displayed on a liquid crystal monitor (to be described later) between a viewfinder view and a live view. The power switch lever 33 is an operation member for turning on / off the power of the camera 1. By turning the power switch lever 33, the main power source of the camera 1 is switched on / off.

  The control dial 34 is a member for setting shooting information. By operating the control dial 34, various settings are performed during shooting.

  On the back surface of the body unit 30, a liquid crystal monitor 36 for displaying a photographed image, a menu, and the like, a playback button 37, a menu button 38, a cross key 40, an OK button 41, and an eyepiece optical system finder 43 are provided. Etc. are arranged.

  The playback button 37 is a button for switching the operation mode of the camera 1 to a playback mode in which an image can be played back from a JPEG file recorded on a flash ROM 84 or a recording medium 85 described later. The menu button 38 is a button for displaying a menu screen on the liquid crystal monitor 36. This menu screen is composed of menu items having a plurality of hierarchical structures. The user can select a desired menu item with the cross key 40 and can determine an item selected with the OK button 41.

  FIG. 2 is a perspective view showing the configuration of the finder optical system of the camera according to the first embodiment of the present invention.

  The finder optical system 50 is a plurality of mirrors for guiding the light beam from the subject that has passed through the photographing lens 11 in the lens barrel to the eyepiece lens 57 constituting the finder 43, that is, a first reflecting mirror (movable mirror). 51, a second reflecting mirror 52, a third reflecting mirror 53, a fourth reflecting mirror 54, a focusing screen (screen mat) 56, and an eyepiece lens 57.

  The first reflecting mirror 51 is configured to be rotatable about the shaft 51a in the direction of the arrow A, and a part of the first reflecting mirror 51 is configured as a half mirror for an AF sensor unit 71 described later. The first reflecting mirror 51, as shown in the figure, observes the light beam incident from the photographing lens 11 in the direction of the second reflecting mirror 52, which is at an angle of about 90 ° with respect to the optical axis of the photographing lens 10, as shown in the figure. Reflected rightward when viewed from the lens barrel 10 side of the camera body 30. At the time of imaging, the light beam is retracted from the imaging optical path and operates so that the light beam from the subject is guided to an imaging element (not shown) disposed behind the first reflection mirror.

  The light beam reflected by the reflecting surface of the first reflecting mirror 51 is incident on the second reflecting mirror 72 via the focusing screen 56. The second reflection mirror 52 is disposed on the reflection optical axis from the first reflection mirror 51, and its reflection surface is inclined at a predetermined angle with respect to the reflection optical axis of the first reflection mirror. . The reflected light beam from the first reflecting mirror 51 incident on the second reflecting mirror 52 is reflected toward the angle of about 90 ° with respect to the reflected optical axis from the first reflecting mirror 51, that is, upward of the camera body 30. Is done.

  The light beam reflected by the reflecting surface of the second reflecting mirror 52 is on the reflecting optical axis of the reflecting surface of the second reflecting mirror 52, and the reflecting surface is predetermined with respect to the reflecting optical axis of the second reflecting surface. It is incident on the third reflecting mirror 53 that is inclined at an angle of. The reflected light beam from the second reflecting mirror 52 incident on the third reflecting mirror 53 is approximately 90 ° with respect to the reflected optical axis from the reflecting surface of the second reflecting mirror 52 at the reflecting surface of the third reflecting mirror 53. And is reflected in a direction opposite to the reflection direction by the reflection surface of the first reflection mirror 51. That is, the reflected light beam from the reflecting surface of the second reflecting mirror 52 is reflected by the reflecting surface of the third reflecting mirror 53 toward the left direction of the camera body 30. In other words, the light beam reflected by the reflecting surface of the first reflecting mirror 51 is guided by the second and third reflecting mirrors 52 and 53 so that the reflected optical axis of the reflecting surface of the third reflecting mirror 53 is The first reflection mirror 51 is directed to the fourth reflection mirror 54 substantially parallel to the reflection optical axis of the reflection surface.

  The light beam reflected by the reflecting surface of the third reflecting mirror 53 is on the reflecting optical axis of the reflecting surface of the third reflecting mirror 53, and the reflecting surface is the reflected light of the reflecting surface of the third reflecting mirror 53. The light is incident on a fourth reflecting mirror 54 that is disposed at a predetermined angle with respect to the axis. Then, the reflected light beam from the third reflection mirror 53 incident on the fourth reflection mirror 54 is approximately 90 ° with respect to the reflection optical axis from the third reflection mirror 53 on the reflection surface of the fourth reflection mirror 54. Reflected at an angle of. That is, the reflected light beam from the reflection surface of the third reflection mirror 53 is incident on the eyepiece lens 57 disposed on the reflection optical axis of the reflection surface of the fourth reflection mirror.

  The focusing screen 56 has a diffusing surface for diffusing the light beam incident on the finder optical system 50 described above to form an optical image. Are arranged at optically equivalent positions.

  The second reflection mirror 52 and the fourth reflection mirror 54 are half mirrors. On the back side of the reflecting surface of the second reflecting mirror 52, a photometric sensor 63 for measuring the brightness of the subject and a focus display LED 64 are arranged. The focus display LED 64 is used to superimpose and display where the focus is on the screen. On the other hand, an imaging lens 60 and a display image sensor 61 are disposed on the back side of the reflection surface of the fourth reflection mirror 54. The display image sensor 61 is a second image pickup means for forming an image on the focusing screen 56 through the imaging lens 60. Therefore, although the image formed on the display image sensor 61 is inverted, it is the same as the image seen by the photographer's eyes 58.

  In this way, the subject luminous flux from the photographing lens 11 is inverted by the first to fourth reflection mirrors 51 to 54 described above so that the image becomes an erect image and guided to the eyepiece lens 57. Thereby, the subject image formed on the focusing screen 56 by the photographer's eye 58 can be observed through the eyepiece lens 57 (finder 43).

  In the present embodiment, the first reflecting mirror 51, the second reflecting mirror 52, the third reflecting mirror 53, and the fourth reflecting mirror 54 are arranged so as to reflect at an angle of about 90 ° with respect to the incident light beam. However, it is not limited to this.

  FIG. 3 is a block diagram showing the system configuration of the camera according to the first embodiment of the present invention.

  In FIG. 3, the lens barrel 10 can be detachably mounted via a lens mount (not shown) provided on the front surface of the camera body 30. The lens barrel 10 includes a photographic lens 11, a diaphragm 12, a lens driving mechanism 13, a diaphragm driving mechanism 14, and a lens control microcomputer (hereinafter abbreviated as Lμcom) 15. .

  The photographing lens 11 is driven in the optical axis direction by a DC motor (not shown) existing in the lens driving mechanism 13. The diaphragm 12 is driven by a stepping motor (not shown) existing in the diaphragm driving mechanism 14. The Lμcom 15 drives and controls each part in the lens barrel 10 such as the lens driving mechanism 13 and the aperture driving mechanism 14. The Lμcom 15 is electrically connected to a body control microcomputer 80, which will be described later, via the communication connector 20, and is controlled in accordance with a command from the body control microcomputer 80. In addition, in Lμcom 15, coefficients and the like described later are stored in advance.

  On the other hand, the camera body 30 is configured as follows.

  A light beam from a subject (not shown) that is incident through the photographing lens 11 and the diaphragm 12 in the lens barrel 10 is reflected by a first reflecting mirror 51 that is a movable mirror, and then a focusing screen 56 and the first reflecting mirror 51. At the same time, the eyepiece lens 57 is reached via the second to fourth reflecting mirrors 52 to 54 (see FIG. 2) constituting the finder optical system 50. Further, a part of the subject luminous flux that has passed through the half mirror portion of the first reflecting mirror 51 is reflected by the sub mirror 70 that operates independently of the first reflecting mirror 51, and an AF sensor for performing automatic ranging. Guided to unit 71. In FIG. 3, although the first reflection mirror 51 is shown separately, the find optical system 50 is configured together with the second to fourth reflection mirrors and the like.

  Here, the details of the AF sensor unit 71 described above will be described with reference to FIG.

  In FIG. 4, the AF sensor unit 71 detects a focus adjustment state for a plurality of focus detection areas 117a, 117b, and 117c set in the photographing screen 117 shown in FIG. The AF sensor unit 71 includes an AF sensor 102 and a focus detection optical system 101.

  This AF sensor unit 71 includes a field mask 110, a focus detection optical system 101 having a plurality of condenser lenses 111, a diaphragm mask 113, and a plurality of sets of separator lenses 114, and an AF sensor 102 having a plurality of line sensors 115. The main part is composed. The output of the AF sensor unit 71 is supplied to a Bμcom 80 connected to the AF sensor unit 71. The AF sensor 102 is controlled by the body control microcomputer 80 via the AF sensor driving circuit 72.

  In order to detect a focus adjustment state with respect to a plurality of focus detection areas (for example, 106a, 106b, 106c) set in the photographing screen 105, a condenser lens 111 corresponding to each focus detection area and a luminous flux from a subject It divides | segments with the separator lens 114, forms an image on the line sensor 115, and performs the focus detection by a phase difference detection system. That is, the subject light in the focus detection area in the shooting screen passes through the shooting lens 11 and enters the condenser lens 111 corresponding to each focus detection area. The light emitted from the condenser lens 111 passes through a separator lens 114 disposed in each focus detection area. The two images formed by the separator lens 114 are formed on the corresponding line sensor 115.

  Image data for each line sensor 115 is output from the AF sensor 102 to the body control microcomputer 80. The body control microcomputer 80 calculates the two-image interval L from the light intensity distribution of the two images of each line sensor, and calculates the defocus amount Df for each focus detection area.

  Each area on the imaging area of the display imaging element 61 corresponding to a plurality of focus detection areas in the shooting screen by the AF sensor unit 71 is adjusted and associated in advance in the manufacturing process.

  The body control microcomputer 80 selects a correction defocus amount using a predetermined selection algorithm based on the correction defocus amount data of the all-focus detection area. For example, if the closest selection is made, the correction defocus amount of the rearmost pin is adopted. Then, the body control microcomputer 80 transmits the selected defocus amount Df to Lμcom 15.

  The Lμcom 15 calculates lens driving amount data based on the defocus amount Df, and drives the focus lens in the photographing lens 11 by the lens driving mechanism 13. Further, when an operation unit (not shown) is operated by the photographer and a specific focus detection area is selected from a plurality of focus detection areas, the defocus amount may be corrected for the selected focus detection area.

  Returning to FIG. 3, a focal plane shutter 66 and a photoelectric conversion element of an imaging optical system for photoelectrically converting a subject image that has passed through the optical system are disposed behind the first reflecting mirror 51 on the optical axis. There is provided a photographing imaging element (first imaging means) 67 composed of a CCD or the like. That is, when the first reflecting mirror 51 is retracted from the imaging optical path, the light flux that has passed through the imaging lens 11 and the aperture 12 is imaged on the imaging surface of the imaging element 67 for imaging.

  Further, as described above, in the finder optical system 50, the photometric sensor 63 and the focus display LED 64 are disposed in the vicinity of the second reflection mirror 52, and the display image sensor 61 is disposed in the vicinity of the fourth reflection mirror 54. ing. The display imaging element 61 and the imaging imaging element 67 are connected via an interface circuit 81 to an image processing controller 82 for performing image processing. The image processing controller 82 is connected to the liquid crystal monitor 36 described above, the SDRAM 83, the FlashMemory 84, the recording medium 85, and the like provided as storage areas. These are configured to provide an electronic recording display function together with an electronic imaging function.

  The recording medium 85 is an external recording medium such as various memory cards and an external hard disk drive (HDD) that can be attached to and detached from the camera body 30 via a camera interface (not shown).

  The image processing controller 82 includes a photometry sensor 63 via a photometry circuit 87, an AF sensor drive circuit 72, a mirror drive mechanism 73, a shutter charge mechanism 75, a shutter control circuit 76, and a non-volatile memory (EEPROM) 88. At the same time, it is connected to a body control microcomputer (hereinafter abbreviated as Bμcom) 80 for controlling each part in the camera body 30. The Bμcom 80 is further connected to an operation display LCD 90 for notifying the photographer of the operation state of the camera by display output, a camera operation switch (SW) 91, and a battery 93 via a power circuit 92. ing.

  The Bμcom 80 and the Lμcom 15 are electrically connected to each other via the communication connector 20 when the lens barrel 10 is mounted. The Lμcom 15 operates as a digital camera while cooperating with the Bμcom 80 in a dependent manner.

  The AF sensor driving circuit 72 is a circuit for driving and controlling the AF sensor unit 71, and the mirror driving mechanism 73 is a mechanism for driving and controlling the first reflecting mirror 51. The shutter charge mechanism 75 charges a spring that drives a front curtain and a rear curtain (not shown) constituting the shutter 66. The shutter control circuit 76 controls the movement of the front curtain and rear curtain of the shutter 66, and exchanges a signal for controlling the opening / closing operation of the shutter and a signal synchronized with the strobe with the Bμcom 80. The photometric circuit 87 is a circuit that performs photometric processing based on the electrical signal of the photometric sensor 63.

  The non-volatile memory 88 is a storage means for storing predetermined control parameters required for camera control as a storage area other than the above-described SDRAM 83, Flash Memory 84, and recording medium 85, and is provided so as to be accessible from the Bμcom 80.

  The operation display LCD 90 is for notifying the user of the operation state of the camera by display output. The camera operation switch 91 is, for example, instructed to perform a photographing operation and, as will be described later, a release switch for switching the first reflecting mirror 51 in and out of the photographing optical path, a mode change switch and a power switch for switching between the photographing mode and the image display mode, Furthermore, it has a function as an area selection means, and is configured by a switch group including operation buttons necessary for operating the camera. Further, the power supply circuit 92 is provided for converting the voltage of the battery 93 as a power supply into a voltage required for each circuit unit of the camera system and supplying the voltage.

  The camera of the present embodiment is configured to be able to select two types of AF methods, a phase difference AF method and a hill-climbing AF method.

  The phase difference AF method performs the above-described operation. Next, the hill-climbing AF method will be described with reference to FIGS. 6 and 7.

  The image processing controller 82 includes a focus evaluation value creating circuit 120 that is a circuit block for obtaining a focus evaluation value as shown in FIG. The focus evaluation value generation circuit 120 is configured so that the luminance signal generated in the image processing controller 82 is obtained as a focus evaluation value and output to the Bμcom 80, so that a high-pass filter (HPF) 121 and an A / D converter 122 are used. , Gate 123 and adder 124 are connected in order.

  In the image processing controller 82, a luminance signal generated from the image signal is output to the HPF 121, and a synchronization signal is output to the focus detection area selection gate 123, the adder 124, and the Bμcom 80 in accordance with the video signal. The HPF 121 extracts a high frequency component included in the luminance signal. Since the extracted high-frequency components are included as the image sharpness increases, the average image sharpness level in the integration range can be quantified by integrating the high-frequency components. The high frequency component that has passed through the HPF 121 is converted into a digital signal by the A / D converter 122 and input to the focus detection area selection gate 123.

  The focus detection area selection gate 123 is a circuit that extracts only signals corresponding to a plurality of focus detection areas on the imaging screen, and extracts only information related to the subject (main subject) imaged in the focus detection area. The digital signal extracted by the focus detection area selection gate 123 is input to the adder 124, and the digital signal for one field is integrated. This integrated value is input to the Bμcom 80 as a focus evaluation value indicating the sharpness of the image.

  The Bμcom 80 can perform a known hill-climbing autofocus (hereinafter, hill-climbing AF) using this focus evaluation value. When performing the hill-climbing AF, the Bμcom 80 moves the focus lens 11 through the Lμcom 15 and inputs the focus evaluation value from the adder 124 to detect the position where the focus evaluation value is maximized. And the focus lens is moved to the focus target position (see FIG. 7).

  It is also possible to adopt a focus detection area selected from a plurality of focus detection areas based on a predetermined selection algorithm (for example, closest selection) or a focus detection area selected by a photographer. It is. Thus, in this embodiment, it is possible to perform both the phase difference AF and the hill-climbing AF operations described above.

  Next, a basic photographing operation of the camera according to the first embodiment will be described with reference to timing charts of FIGS. 8, 9, and 11.

  FIG. 8 is a timing chart for explaining the operation of the camera in the live view mode and the phase difference AF mode in the first embodiment, and FIG. 9 shows the viewfinder view mode in the first embodiment. FIG. 11 is a timing chart for explaining the operation of the camera. FIG. 11 shows a live view mode and a hill-climbing AF mode. Note that the operation of this camera is mainly performed under the control of Bμcom80.

  In the timing charts of FIGS. 8 and 9, AE is automatic exposure, AF is automatic focus adjustment, EXP is main exposure, MU and MD are mirror retract and return of the first reflecting mirror 51, SC is shutter charge, E1 represents exposure information, P represents image processing, P1 represents an image of the image sensor 67 for photographing, and D1 represents an image of the image sensor 61 for display.

  First, the photographing operation in the live view mode and the phase difference AF mode will be described.

  When the power switch lever 33 of the camera 1 is operated and the power is turned on, the photometric sensor 63 and the AF sensor unit 71 repeatedly execute the AE and AF sequences at predetermined intervals. At this time, if the camera 1 is set to the finder view mode, the exposure information is displayed on the liquid crystal monitor 36 provided on the back surface of the camera body 30. Then, when the mode is switched to the live view mode by operating the mode dial 32 at a predetermined timing, the display image sensor 61 is operated, image processing of the captured image is performed, and the image is displayed on the liquid crystal monitor 36. Will come to be. Thereafter, these processes are repeated.

  When the release button 31 is half-pressed to turn on the first release switch (1RSW), a shooting preparation operation is started. That is, the photographing lens 11 is driven to perform a focusing operation, and when it is within the focusing range, the focusing display LED 64 is turned on. In this state, the process waits until the second release switch (2RSW), which is a full pressing operation of the release button 31, is turned on.

  During the focusing operation, the corrected defocus amount Df ′ is transmitted from Bμcom 80 to Lμcom15. The correction defocus amount Df ′ is represented by the sum of the defocus amount Df and the correction value ΔDf, where the obtained correction value is ΔDf. Here, Lμcom 15 calculates lens driving amount data based on the corrected defocus amount Df ′, and the lens driving mechanism 13 drives the focus lens in the photographing lens 11 (FIG. 8: lens driving (sequence)). .

  If the second release switch is turned on, the first reflecting mirror 51 is retracted from the photographing optical path, and narrowing down by the main exposure is performed. At the same time, a charge erasing operation (FLUSH) in the image pickup image sensor 67 is performed, and data reading and image processing of an image taken after the main exposure is performed. Further, after the main exposure is completed, the first reflecting mirror 51 is returned to the photographing optical path, and the shutter charge mechanism 75 performs the shutter charge. On the other hand, on the liquid crystal monitor 36, the image of the imaging element 67 for which image processing has been performed is displayed for a predetermined period. Thereafter, when a predetermined period elapses, the image captured by the display image sensor 61 is displayed on the liquid crystal monitor 36 again.

  Thus, for example, when shooting with the imaging sensor 67 is performed four times by continuous shooting, the image displayed on the liquid crystal monitor 36 is changed from the image of the display imaging element 61 to the image of the imaging sensor 67 each time. Switch. When the first and second release switches are turned off, an image by the display image sensor 61 is displayed on the liquid crystal monitor 36.

  Next, the photographing operation in the finder view mode will be described based on the timing chart of FIG.

  First, when the power switch lever 33 of the camera 1 is operated and the power is turned on, the photometric sensor 63 and the AF sensor unit 71 repeatedly execute the AE and AF sequences at predetermined intervals. At this time, the exposure information is displayed on the liquid crystal monitor 36 provided on the back surface of the camera body 30. When the first release switch is turned on by half-pressing the release button 31 at a predetermined timing, a shooting preparation operation is started. That is, the photographing lens 11 is driven to perform a focusing operation, and when it is within the focusing range, the focusing display LED 64 is turned on. In this state, the process waits until the second release switch (2RSW), which is a full press of the release button 31, is turned on. During this photographing preparation operation, the photographer takes a picture while looking through the finder 43, so that unnecessary displays are not displayed on the liquid crystal monitor 36 in order to prevent waste of energy and concentrate consciousness.

  Next, when the second release switch is turned on, the first reflecting mirror 51 is retracted from the photographing optical path, and narrowing down by the main exposure is performed. At the same time, an operation for erasing electric charges in the image pickup image sensor 67 is performed, and data reading and image processing of an image taken after the main exposure is performed. Further, after the main exposure is completed, the first reflecting mirror 51 is returned to the photographing optical path, and the shutter charge mechanism 75 performs the shutter charge. On the other hand, on the liquid crystal monitor 36, the image of the imaging element 67 for which image processing has been performed is displayed for a predetermined period. Thereafter, the liquid crystal monitor 36 is turned off during the preparatory operation to perform the next photographing, and the image of the photographing imaging element 67 is displayed on the liquid crystal monitor 36 again after the image processing.

  In this way, for example, when shooting is performed with the imaging element 67 for four times, an image of the imaging element 67 is displayed on the liquid crystal monitor 36 each time.

  Next, with reference to FIG. 10, an image observed on the finder 43 and an image displayed on the liquid crystal monitor 36 will be described.

  10A is a diagram showing an example of the focusing screen 56, and FIG. 10B is a diagram showing a display example of the liquid crystal monitor 36. FIG.

  In FIG. 10A, an AF target mark 130 is engraved on the surface of the focusing screen 56 as a reference point for AF. The photographer observes an image projected on the focusing screen 56 provided with such an AF target mark 130 through the finder 43.

  On the other hand, the subject image is displayed on the liquid crystal monitor 36 on the back of the camera body 30 as shown in FIG. Assume that the images on the left side of FIG. 10B are sequentially updated as time passes. The display images of the liquid crystal monitor 36 in the live view mode, that is, the live view images 131a and 131b are displayed in a state where the images (132a, 132b, and 132c) of the AF target mark 130 described above are also included. As described above, when the first (1st) release switch is turned on and the photographing lens is brought into focus, the focus display LED 64 is lit, so that the corresponding AF target mark, for example, on the live view image 131c, for example, 132a is turned on.

  When the second (2nd) release switch is turned on in this state, an actually captured image 131d of the imaging element 67 is displayed on the liquid crystal monitor 36. Then, after the image 131d is displayed for a predetermined period, the live view image 131e on which the focus marks 132a to 132c are displayed is displayed on the liquid crystal monitor 36. Note that when the image 131d of the image pickup device 67 actually taken is displayed on the liquid crystal monitor 36, it may be differentiated from the live view image by displaying a frame around the image as shown in the figure. Good.

  Thus, when displaying an actual captured image, a captured image without an AF target mark is displayed, so that it can be easily distinguished from a live view image.

  Next, with reference to the timing chart of FIG. 11, a shooting operation in the live view mode and the hill-climbing AF mode will be described.

  When the power switch lever 33 is operated to turn on the power, the AE sequence is repeatedly executed by the photometric sensor 63 at a predetermined interval. The display image sensor 61 operates, image processing of the captured image is performed, and the image is displayed on the liquid crystal monitor 36. Thereafter, this process is repeated.

  In the AF mode, the mountain climbing AF mode is set. When the release button 31 is half-pressed to turn on the first release switch (1RSW), a shooting preparation operation is started. While driving the photographic lens 11, the image captured by the display image sensor 61 is processed, a focus evaluation value is calculated, and hill-climbing AF is executed. As a result, when the focus is reached, the focus display LED 64 is turned on. Then, it waits until the release button 31 is fully pressed and the second release switch (2RSW) is turned on.

  If the second release switch is turned on, the first reflecting mirror 51 is retracted from the photographing optical path, the aperture is narrowed down, and the main exposure operation is performed. At the same time, the lens drive (LD) of the focus lens is performed by an amount corresponding to the difference between the optical path lengths of the display imaging element 61 and the imaging imaging element 67 to correct the optical path length difference. The optical path length difference data Dk between the display image sensor 61 and the image sensor 67 is adjusted in the manufacturing process, stored in advance in the nonvolatile memory 88, and read and used.

The focus lens drive amount K is calculated by the following equation.
K = Dk × Fk
Here, Fk is a coefficient for converting the image plane defocus amount into the focus lens movement amount, and differs depending on the optical characteristics of the photographing lens.
The coefficient Fk is stored in advance in a memory 15a built in the photographic lens 11, and the Bμcom 80 communicates with the Lμcom 15 to acquire the coefficient Fk. Dk and Fk are respectively set corresponding to a plurality of focus detection areas, and data corresponding to the selected focus detection area is adopted.

  FIG. 12 is a flowchart of Bμcom 80 for explaining the operation for correcting the optical path length.

  When the lens drive direction for correcting the optical path length is reversed with respect to the final lens drive direction by hill-climbing AF, the backlash of the lens drive system exists, so backlash for correct correction is removed. There is a need to.

  When this routine is started, first, in step S1, it is determined whether or not the lens driving direction for correcting the optical path length is reversed with respect to the final lens driving direction by hill-climbing AF. For example, the last lens drive by the hill-climbing AF operation is the retraction direction, and the lens drive direction of the optical path length correction is the retraction direction (the optical path length of the imaging image sensor 67 is the optical path length of the display image sensor 61). If less than), backlash is present. If it is reversed, the process proceeds to step S2. If it is not reversed, the process proceeds to step S3.

  In step S2, lens driving for backlash is performed in a direction to remove backlash. The lens driving amount for backlash is stored in advance in the memory 15a in the Lμcom 15 in accordance with the lens position and zoom position, and this is read out by the Bμcom 80 to set the lens driving amount. In step S3, lens driving corresponding to the optical path length difference is performed in the direction of removing the optical path length difference.

  Returning to the explanation of the timing chart of FIG. 11, the first reflection mirror 51 is retracted from the photographing optical path, and at the same time, the charge removing operation (FLUSH) in the photographing image sensor 67 is performed, and the main exposure is performed. Thereafter, the captured image data is read and image processing is performed. Further, after the main exposure is completed, the first reflecting mirror 51 is returned to the photographing optical path, and the shutter charging operation by the shutter charging mechanism 75 is performed.

  On the other hand, the captured image is displayed on the liquid crystal monitor 36 only for a predetermined period. Further, when the predetermined period elapses, the image captured by the display image sensor 61 is displayed on the liquid crystal motor 36 again.

  As described above, when focusing with hill-climbing AF using a live-view display image sensor, the optical path length between the live-view display image sensor and the imaging image sensor after focusing with hill-climbing AF. Since the lens is driven by this difference to perform focus correction, it is possible to perform highly accurate focus adjustment.

(Second Embodiment)
Next, a second embodiment of the present invention will be described.

  In the second embodiment, a shooting operation in the live view mode and the MF mode will be described.

  In the second embodiment, the basic configuration of the digital camera is the same as that of the first embodiment shown in FIGS. 1 to 7 described above, and the basic shooting operation is also the same. It is. Accordingly, for these configurations and operations, the same reference numerals are given to the same parts, and illustration and description thereof are omitted.

  Hereinafter, the second embodiment of the present invention will be described with reference to the timing chart of FIG.

  When the power switch lever 33 is operated to turn on the power, the AE sequence is repeatedly executed by the photometric sensor 63 at a predetermined interval. Then, the display image sensor 61 is operated, image processing of the captured image is performed, and the image is displayed on the liquid crystal monitor 36. Thereafter, this process is repeated.

  In the AF mode, the MF mode is set. When the release button 31 is half-pressed to turn on the first release switch (1RSW), a shooting preparation operation is started. By manually operating the operation member, the focus lens position is adjusted while the focus lens of the photographing lens 11 is moved and the image captured by the display image sensor 61 and displayed on the liquid crystal monitor 36 is observed. At this time, the integration operation of the AF sensor 102 and the distance calculation operation of the phase difference AF by Bμcom 80 are repeatedly executed in parallel, and the detected defocus amount DF is updated and stored.

  Then, it waits until the release button 31 is fully pressed and the second release switch (2RSW) is turned on. If the second release switch is turned on, the phase difference AF operation is performed.

  Next, the operation of the phase difference AF after MF described above will be described with reference to the flowchart of FIG.

  When this routine is started, first, the latest detected defocus amount DF is read from the memory 15a in step S11. Next, in step S12, the DF is compared with a predetermined value to determine whether it is within a predetermined range. Here, if the DF is within the predetermined range, the process proceeds to step S13, and if not, this routine ends. If the detected defocus amount DF is larger than a predetermined value, the subject that is focused during MF and the subject detected by the phase difference AF may be different, and the lens driving time may be This is because the time lag increases due to the increase, which is not preferable, so the phase difference AF process is stopped.

  In step S13, it is determined whether or not the lens driving direction is reversed. If the lens drive is reversed, the process proceeds to step S14, and otherwise, the process proceeds to step S15. In step S14, the lens is driven by the amount of backlash and the backlash is removed. In step S15, lens driving corresponding to DF is performed. Thereafter, this routine ends.

  Returning to the timing chart of FIG. 13, when the phase difference AF operation is completed and the in-focus state is reached, the first reflecting mirror 51 is retracted from the photographing optical path, the aperture is narrowed down, and the main exposure operation is performed. At the same time, a charge removing operation (FLUSH) in the image pickup image sensor 67 is performed, and the main exposure is performed. Thereafter, the captured image data is read and image processing is performed.

  Further, after the main exposure is completed, the first reflecting mirror 51 is returned to the photographing optical path, and the shutter charging operation by the shutter charging mechanism 75 is performed.

  On the other hand, the captured image is displayed on the liquid crystal monitor 36 only for a predetermined period. Further, when the predetermined period elapses, the image captured by the display image sensor 61 is displayed on the liquid crystal monitor 36 again.

  As described above, it is difficult to display the image of the image pickup device for display on the liquid crystal monitor 36 in the live view mode and perform MF while observing this image, and it is difficult to grasp the peak of the focus. Since there is a difference in optical path length between the display image sensor and the image sensor for photographing, the focus accuracy cannot be obtained. However, according to the second embodiment described above, since the phase difference AF is performed after the MF operation is completed, it is possible to perform highly accurate focus adjustment.

  As a modification, hill-climbing AF that uses the imaging element 67 for imaging instead of the phase difference AF may be performed. The first reflective mirror 51 may be retracted in the same manner as the hill-climbing AF (described above) of the display image sensor 61.

(Third embodiment)
Next, a third embodiment of the present invention will be described.

  In the third embodiment, a shooting operation in the live view mode without the MF mode will be described.

  In the third embodiment, when the live view mode is set, the MF mode cannot be selected. The MF operation of the present embodiment is configured to perform the MF operation by so-called power focus by an in-lens motor (not shown).

  Hereinafter, a third embodiment of the present invention will be described.

  In the third embodiment, the basic configuration of the digital camera is the same as that of the first embodiment shown in FIGS. 1 to 7 described above, and the basic shooting operation is also the same. It is. Accordingly, for these configurations and operations, the same reference numerals are given to the same parts, and illustration and description thereof are omitted.

  FIG. 15 is a block diagram showing a configuration of a portion related to the lens operation in the lens barrel 10.

  The lens barrel 10 includes an Lμcom 15 having a rotation direction detection unit 143 and a rotation speed detection unit 144, a lens motor 147, a lens driving mechanism 13 having a motor rotation number detection unit 148, and a photographing lens 11 including a focus lens. The rotation operation member 141, the pulse generation unit 142, and the motor drive control unit 146 are configured.

  When the rotation operation member 141 provided on a part of the lens barrel 10 is rotated, two-phase pulses having different phases are generated from the pulse generator 142 in accordance with the rotation. The two-phase pulses are input to the rotation direction detection unit 143 and the rotation speed detection unit 144 provided in the Lμcom 15, respectively. With this input, the rotation direction detection unit 143 detects the rotation direction of the rotation operation member 141 from the phase of the two-phase pulse, and the rotation speed detection unit 144 rotates the rotation operation member 141 from the frequency or pulse width of the two-phase pulse. Speed is detected.

  The rotation direction information detected by the rotation direction detection unit 143 and the rotation speed information detected by the rotation speed detection unit 144 are input to the motor drive control unit 146. The motor drive control unit 146 outputs a motor drive pulse corresponding to the rotation direction information and the rotation speed information to the lens motor 147 in the lens drive mechanism 13 and determines the duty ratio of the drive current of the lens motor 147. The moving speed of the photographing lens (focus lens) 11 is determined in accordance with the duty ratio of the drive current.

  Then, the rotation pulse of the lens motor 147 is guided to the motor rotation number detection unit 148 in the lens drive mechanism 13, whereby the rotation frequency of the lens motor 147 is detected, and this is fed back to the motor drive control unit 146 as feedback information. It is designed to be entered. The entire lens barrel 10 is controlled by Lμcom 15.

  In this way, the MF operation is performed by driving the photographing lens 11 in accordance with the rotation direction and rotation speed of the rotation operation member 141. The prohibition of the MF operation is such that the rotation direction detection unit 143 and the rotation speed detection unit 144 are not operated by Lμcom 15 and the MF operation is not performed even if the rotation operation member 141 is operated.

  Next, with reference to the flowchart of FIG. 16, the operation of MF mode setting in the third embodiment of the present invention will be described.

  When this sequence starts, it is first determined in step S21 whether or not an MF mode setting operation has been performed. If the setting operation has been performed, the process proceeds to step S22. If the operation has not been performed, this sequence ends. In step S22, it is determined whether or not the live view mode is set. If it is not set, the process proceeds to step S23. If it is set, the sequence ends without setting the MF mode.

  In step S23, the focus mode is set to the MF mode. Thereafter, this sequence ends.

  In the live view mode, it is difficult to display the image of the display image sensor 61 on the liquid crystal monitor 36 and perform MF while observing this image because the image is rough and the focus peak is difficult to grasp. Accuracy cannot be obtained. As described above, in the live view mode, the AF mode is automatically set as the MF mode is not set, so that the focus is not achieved even though the MF is focused. Is not given to the photographer, and usability can be improved.

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described.

  In the fourth embodiment, a shooting operation in the live view mode when there is no focus aid display will be described.

  As described above, when the image of the display image sensor 61 is displayed on the liquid crystal monitor 36 and MF is performed while observing the image, the display image is rough and it is difficult to grasp the focus peak. Accordingly, there is a problem in that the consistency with the focus aid display by the phase difference AF is low, and the photographer feels uncomfortable. In order to solve such a problem, when the live view mode is set, the focus aid display on the liquid crystal monitor is turned off. At this time, the focus aid display in the finder is turned on. Therefore, even when the live view mode is set, with MF while observing a finder with high focus accuracy, it is possible to focus with high accuracy according to the index of the focus aid display. On the other hand, since MF while observing a liquid crystal monitor with low focus accuracy is not recommended, a focus aid display as an index is not displayed, and MF operation is difficult.

  FIG. 17 is a diagram showing a display example of the finder 43 including a finder display, and FIG. 18 is a diagram showing a display example of the liquid crystal monitor 36 when displaying an image of the display image sensor 61.

  On the screen 151 in the viewfinder, reference numerals 152, 153, and 154 denote focus detection areas, and reference numerals 155, 156, and 157 denote focus aid displays. On the display screen 161 of the liquid crystal monitor 36, the screen frame coincides with the image frame. Reference numerals 162, 163, and 164 denote focus detection areas, and reference numerals 165, 166, and 167 denote focus aid displays.

  The focus detection area display shows an image obtained by imaging a marking line in the focus detection area of the screen mat. Alternatively, the focus detection area may be created and displayed by deleting the marking line portion from the original image by image processing. The focus aid display 156 (166) is a display that indicates that it is within the focusing range. The determination of the in-focus state is determined to be the in-focus state when the difference between the defocus amount calculated by Bμcom 80 and a predetermined determination value is within a predetermined range.

  Further, the focus aid displays 155 (165) and 157 (167) are not in focus (so-called front pin state or rear pin state), but to notify the photographer to drive the focus lens in the corresponding direction. Display. Which of these is displayed is determined by whether the calculated defocus amount is a positive value or a negative value.

  Next, the operation of setting the MF mode will be described with reference to the flowchart of FIG.

  When this sequence starts, it is first determined in step S31 whether or not an MF mode setting operation has been performed. If the setting operation has been performed, the process proceeds to step S32. If the setting operation has not been performed, the sequence ends. In step S32, the focus mode is set to the MF mode.

  Next, in step S33, it is determined whether or not the live view mode is set. Here, when the live view mode is set, the process proceeds to step S34, and when it is not set, this sequence ends. In step S34, the focus aid display on the liquid crystal monitor 36 is turned off. Thereafter, this sequence ends.

  Next, as a modification of the fourth embodiment of the present invention, the operation for setting the focus aid display will be described with reference to the flowchart of FIG. This processing operation is performed by Bμcom80.

  When this sequence is started, first, in step S41, it is determined whether or not an MF mode setting operation has been performed. Here, if the MF mode is set, the process proceeds to step S42, and if not, the process proceeds to step S47. In step S42, it is determined whether or not the live view mode is set. If the live view mode is set, the process proceeds to step S43. If not, the process proceeds to step S45.

  In step S43, the focus aid display in the finder 43 is displayed (focus aid displays 155, 156, and 157 in FIG. 17). Next, in step S44, the focus aid display on the liquid crystal monitor 36 is turned off (focus aid displays 165, 166, and 167 in FIG. 18). Thereafter, this sequence ends.

  In step S45, the focus aid display in the finder 43 is displayed. Next, in step S46, the image display on the liquid crystal monitor 36 is turned off. Thereafter, this sequence ends.

  In step S47, the focus aid display in the finder 43 and the liquid crystal monitor 36 are both turned off. Thereafter, this sequence ends.

  As described above, according to the fourth embodiment, when the image of the display image sensor 61 is displayed on the liquid crystal monitor 36 in the live view mode and the MF is performed while observing the image, the image is coarsely focused. Therefore, the problem that the photographer has a sense of incongruity due to low consistency with the focus aid display by phase difference AF is solved, and usability can be improved.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention.

  Further, the above-described embodiments include inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements. For example, even if some constituent requirements are deleted from all the constituent requirements shown in the embodiment, the problem described in the column of the problem to be solved by the invention can be solved, and the effect described in the column of the effect of the invention Can be extracted as an invention.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 illustrates a first embodiment of the present invention, and is an external perspective view illustrating a configuration of a single-lens reflex type digital camera to which a focus adjustment device of the present invention is applied. It is a perspective view which shows the structure of the finder optical system of the camera in the 1st Embodiment of this invention. 1 is a block diagram illustrating a system configuration of a camera according to a first embodiment of the present invention. It is a perspective view which shows schematic structure of the AF sensor unit 71 of FIG. It is the figure which showed the example of the area | region corresponding to the focus detection areas 106a-106c in the imaging area 117 of the imaging device 61 for a display. FIG. 2 is a block diagram illustrating a configuration of a focus evaluation value creating circuit 120 in an image processing controller 82, for explaining a hill climbing AF method. FIG. 10 is a diagram illustrating a hill-climbing AF method, and is a diagram illustrating a relationship between a focus lens position and a focus evaluation value. 6 is a timing chart for explaining the operation of the camera in the live view mode and the phase difference AF mode in the first embodiment of the present invention. 5 is a timing chart for explaining the operation of the camera in a finder view mode in the first embodiment of the present invention. (A) is a diagram showing one example of the focusing screen 56, and (b) is a diagram showing a display example of the liquid crystal monitor 36. It is a timing chart for demonstrating imaging | photography operation | movement at the time of live view mode and hill-climbing AF mode. It is a flowchart of Bmicrocom80 for demonstrating the operation | movement which correct | amends optical path length. It is a timing chart for demonstrating the 3rd Embodiment of this invention. It is a flowchart for demonstrating operation | movement of phase difference AF after MF. 3 is a block diagram showing a configuration of a portion related to lens operation in the lens barrel 10. FIG. It is a flowchart for demonstrating the operation | movement of MF mode setting in the 3rd Embodiment of this invention. It is a figure which explains the 4th Embodiment of this invention and showed the example of a display of the finder 43 containing a finder display. FIG. 10 is a diagram illustrating a display example of a liquid crystal monitor when displaying an image of a display image sensor 61, illustrating a fourth embodiment of the present invention. It is a flowchart for demonstrating the operation | movement of MF mode setting in the 4th Embodiment of this invention. It is a flowchart for demonstrating the operation | movement which sets a focus aid display as a modification of the 4th Embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Lens barrel, 11 ... Shooting lens, 12 ... Diaphragm, 13 ... Lens drive mechanism, 14 ... Diaphragm drive mechanism, 15 ... Microcomputer for lens control (L [mu] com), 15a ... Memory, 20 ... Communication connector, 30 ... Camera 31 ... Release button, 32 ... Mode dial, 33 ... Power switch lever, 34 ... Control dial, 36 ... Liquid crystal monitor, 43 ... Viewfinder, 50 ... Viewfinder optical system, 51 ... First reflection mirror, 52 ... Second reflection Mirror, 53 ... third reflection mirror, 54 ... fourth reflection mirror, 56 ... focusing screen, 57 ... eyepiece, 61 ... image sensor for display, 64 ... LCD for focusing display, 66 ... shutter, 67 ... display for photographing Element 71 ... AF sensor unit 72 ... AF sensor drive circuit 73 ... Mirror drive mechanism 75 ... Shutter 76, shutter control circuit, 81 ... interface circuit, 82 ... image processing controller, 83 ... SDRAM, 84 ... FlashRom, 85 ... non-volatile memory (EEPROM), 90 ... LCD for operation display, 91 ... camera operation switch (SW), 92 ... power supply circuit, 101 ... focus detection optical system, 102 ... AF sensor, 120 ... focus evaluation value generation circuit, 121 ... high pass filter (HPF), 122 ... A / D converter, 123 ... gate, 124 ... adder, 130 ... AF target mark.

Claims (14)

First imaging means for obtaining an imaging signal from a subject luminous flux that has passed through the taking lens;
A movable mirror that is movable back and forth with respect to the imaging optical path of the first imaging means, and that reflects a subject light beam in the imaging optical path;
A second imaging means for obtaining an imaging signal from the subject luminous flux reflected by the movable mirror;
Display means capable of displaying the image signal acquired by the first or second imaging means;
In a camera having
An imaging signal focus adjusting means for performing a focus adjustment operation based on an imaging signal of the second imaging means;
Storage means for storing an optical path length difference between the first imaging means and the second imaging means;
Correction means for correcting a difference in optical path length between the first imaging means and the second imaging means based on the output of the storage means;
Control means for performing correction by the correction means after the focus adjustment by the imaging signal focus adjustment means;
A camera focus adjusting apparatus comprising: The camera further includes a plurality of focus detection areas,
The storage means stores an optical path length difference between the first imaging means and the second imaging means according to the focus detection area,
2. The correction unit according to claim 1, wherein the correction unit corrects a difference in optical path length between the first imaging unit and the second imaging unit based on an output of the storage unit according to the focus detection area. Camera focus adjustment device.   3. The control unit according to claim 1, wherein the control unit controls the correction unit to perform correction after the display unit finishes displaying the image signal acquired by the second imaging unit. The camera focus adjustment device described in 1. First imaging means for obtaining an imaging signal from a subject luminous flux that has passed through the taking lens;
A movable mirror that is movable back and forth with respect to the imaging optical path of the first imaging means, and that reflects a subject light beam in the imaging optical path;
A second imaging means for obtaining an imaging signal from the subject luminous flux reflected by the movable mirror;
Display means capable of displaying the image signal acquired by the first or second imaging means;
In a camera having
Manual focus adjusting means for driving the focus lens based on the operation of the manual operation member;
A phase difference focus adjustment means for performing focus adjustment by a phase difference detection method;
Control means for controlling the focus adjustment by the phase difference focus adjustment means after the focus adjustment by the manual focus adjustment means;
A camera focus adjusting apparatus comprising:   The control means controls the focus adjustment by the phase difference focus adjustment means after the display means finishes displaying the image signal acquired by the second imaging means. Item 5. The camera focus adjustment device according to Item 4. First imaging means for obtaining an imaging signal from a subject luminous flux that has passed through the taking lens;
A movable mirror capable of moving back and forth with respect to the imaging optical path of the first imaging means, and reflecting a subject light beam in the imaging optical path;
A second imaging means for obtaining an imaging signal from the subject luminous flux reflected by the movable mirror;
Display means capable of displaying the image signal acquired by the first or second imaging means;
In a camera having
Having manual focus adjusting means for driving the focus lens based on the operation of the manual operation member;
The camera focus adjustment apparatus, wherein when the image signal acquired by the second image pickup means is displayed, the operation of the manual focus adjustment means is prohibited. First imaging means for obtaining an imaging signal from a subject luminous flux that has passed through the taking lens;
A movable mirror that is movable back and forth with respect to the imaging optical path of the first imaging means, and that reflects a subject light beam in the imaging optical path;
A second imaging means for obtaining an imaging signal from the subject luminous flux reflected by the movable mirror;
Display means capable of displaying the image signal acquired by the first or second imaging means;
In a camera having
Manual focus adjusting means for driving the focus lens based on the operation of the manual operation member;
Focus aid display means for displaying whether in-focus or not,
Comprising
The camera focus adjustment apparatus, wherein when the image signal acquired by the second imaging means is displayed, the operation of the focus aid display is prohibited when the manual focus adjustment means operates. First imaging means for obtaining an imaging signal from a subject luminous flux that has passed through the taking lens;
A movable mirror that is movable back and forth with respect to the imaging optical path of the first imaging means, and that reflects a subject light beam in the imaging optical path;
A second imaging means for obtaining an imaging signal from the subject luminous flux reflected by the movable mirror;
Focus adjusting means for performing a focus adjusting operation based on the image pickup signal of the second image pickup means;
Storage means for storing the optical path length difference between the first imaging means and the second imaging means in advance;
Correction means for correcting the optical path length difference stored in the storage means;
Control means for controlling the correction means to correct the optical path length difference after the focus adjustment operation is performed by the focus adjustment means;
A camera focus adjusting apparatus comprising: In a camera focus adjustment device having a plurality of focus detection areas in a shooting screen,
First imaging means for obtaining an imaging signal from a subject luminous flux that has passed through the taking lens;
A movable mirror that is movable back and forth with respect to the imaging optical path of the first imaging means, and that reflects a subject light beam in the imaging optical path;
A second imaging means for obtaining an imaging signal from the subject luminous flux reflected by the movable mirror;
Focus adjusting means for performing a focus adjusting operation based on the image pickup signal of the second image pickup means;
Storage means for storing the optical path length difference between the first imaging means and the second imaging means according to the plurality of focus detection areas;
Correction means for correcting the optical path length difference based on the output of the storage means according to the focus detection area;
Control means for controlling the correction means to correct the optical path length difference after the focus adjustment operation is performed by the focus adjustment means;
A camera focus adjusting apparatus comprising:   10. The control unit according to claim 8, wherein the control unit controls the correction unit to perform correction after the display unit finishes displaying the image signal acquired by the second imaging unit. The camera focus adjustment device described in 1. First imaging means for acquiring an imaging signal from a subject light flux that has passed through a photographing lens including a focus lens;
A movable mirror that is movable back and forth with respect to the imaging optical path of the first imaging means, and that reflects a subject light beam in the imaging optical path;
A second imaging means for obtaining an imaging signal from the subject luminous flux reflected by the movable mirror;
Manual focus adjusting means for driving the focus lens based on the manual operation of the photographer;
A phase difference focus adjustment means for performing focus adjustment by a phase difference detection method;
Control means for controlling the focus adjustment by the phase difference focus adjustment means after the focus adjustment by the manual focus adjustment means;
Display means capable of displaying an image corresponding to the imaging signal acquired by the first or second imaging means;
A camera focus adjusting apparatus comprising:   The control means controls the display means to perform focus adjustment by the phase difference focus adjustment means after the display of an image corresponding to the imaging signal acquired by the second imaging means is completed. The camera focus adjustment apparatus according to claim 11. First imaging means for acquiring an imaging signal from a subject light flux that has passed through a photographing lens including a focus lens;
A movable mirror capable of moving back and forth with respect to the imaging optical path of the first imaging means, and reflecting a subject light beam in the imaging optical path;
A second imaging means for obtaining an imaging signal from the subject luminous flux reflected by the movable mirror;
Display means capable of displaying an image corresponding to the imaging signal acquired by the first or second imaging means;
Manual focus adjusting means for driving the focus lens based on the manual operation of the photographer;
Control means for controlling to prohibit the operation of the manual focus adjustment means when displaying an image corresponding to the imaging signal acquired by the second imaging means;
A camera focus adjusting apparatus comprising: First imaging means for acquiring an imaging signal from a subject light flux that has passed through a photographing lens including a focus lens;
A movable mirror that is movable back and forth with respect to the imaging optical path of the first imaging means, and that reflects a subject light beam in the imaging optical path;
A second imaging means for obtaining an imaging signal from the subject luminous flux reflected by the movable mirror;
Display means capable of displaying an image corresponding to the imaging signal acquired by the first or second imaging means;
Manual focus adjusting means for driving the focus lens based on the manual operation of the photographer;
Focus aid display means for displaying whether the focus adjustment by the manual focus adjustment means is in focus,
Control means for controlling to prohibit the display operation of the focus aid display means when the manual focus adjustment means operates when displaying an image corresponding to the imaging signal acquired by the second imaging means;
A camera focus adjusting apparatus comprising:

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