JP2007072286A - Camera capable of performing live view display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a camera capable of performing live view display, the camera being designed so that the photographer can easily view a subject image, whether the camera is in a finder view mode or live view mode. <P>SOLUTION: This camera enables observation of a subject image from a photographic lens 11 by using an eyepiece 57. The camera is capable of receiving the subject image by a display imaging element 61, and displaying the subject image by using a liquid crystal monitor. On the camera are arranged a first screen on which the subject image is formed observed with the eyepiece 57, or a second screen on which the subject image is formed displayed by the liquid crystal monitor is selectively linked with a mode switching lever, and disposed in a subject image forming plane as a focusing screen 56. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a camera capable of so-called live view display, in which a subject is continuously imaged by an image sensor such as a CCD and displayed on a display device.

  In general, a digital single lens reflex camera captures a subject image on a focusing screen and displays the image on an electronic viewfinder. In recent years, there has been an increase in what can perform so-called live view display in which subject images are continuously captured and displayed on a liquid crystal monitor or the like. When a live view image is displayed on a liquid crystal monitor, the AF frame for AF ranging provided on the focusing screen is displayed as it is superimposed on the subject image, so that it is difficult to see on the monitor screen. .

Therefore, for example, a technique is known in which an image of a focus adjustment assisting optical member on a focusing screen is erased by image processing (for example, see Patent Document 1).
JP 2001-296484 A

  However, in the technique described in Patent Document 1 described above, the image of the focus adjustment assisting optical member on the focusing screen cannot be completely erased, or the erased portion is an unnatural image. It was.

  Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to provide a camera capable of live view display in which a photographer can easily view a subject image in either the finder view mode or the live view mode. It is.

  That is, according to the first aspect of the present invention, in a camera capable of live view display, an observation optical system for observing a subject image from a photographing lens using an eyepiece optical system, and the subject image is received by an image sensor. Display means for displaying the subject image by an external display device; selection means for selecting whether the light beam from the subject image is to be observed by the observation optical system or to be displayed by the display means; and A first focusing plate for forming and observing according to the observation by the observation optical system; and a second focusing plate for forming the subject image and displaying according to the display by the display means; In conjunction with the selection by the selection means, there is provided a focusing screen switching means for arranging one of the two focusing plates on the subject image forming plane.

  According to a second aspect of the present invention, in the first aspect of the present invention, the first focusing screen is a focusing screen that displays a focus frame.

  According to a third aspect of the present invention, in the first aspect of the present invention, the selecting means is a movable reflecting mirror disposed between the object image forming surface and the eyepiece optical system. And

  According to a fourth aspect of the present invention, in a camera capable of live view display, a photographic lens, a first imaging element that captures a subject image that has passed through the photographic lens, and a subject image formed on the focusing screen An observation optical system for observing the image, a second image sensor provided on the optical path side of the observation optical system, and a subject image based on the output of the first image sensor or the second image sensor Display means, selection means for selecting whether the light beam from the subject image is observed by the observation optical system or displayed by the display means, and a position optically conjugate with the first imaging device A first focusing screen for forming the subject image and performing observation according to observation by the observation optical system, and at a position optically conjugate with the first imaging device. The subject image above. In conjunction with the selection of the second focusing screen for the display according to the display by the display means and the selection means, either the first focusing screen or the second focusing screen is attached to the subject. And switching means for switching to be arranged on the image forming surface.

  The invention according to claim 5 is the invention according to claim 4, wherein the first focusing screen is a focusing screen for displaying a focusing frame.

  According to a sixth aspect of the present invention, in the fourth aspect of the present invention, the selection means is a movable reflecting mirror disposed between the subject image imaging plane and an observation optical system. And

  According to a seventh aspect of the present invention, there is provided a first imaging unit that acquires a subject image from a subject light flux that has passed through a photographing lens, and is capable of moving back and forth with respect to the imaging optical path of the first imaging unit. A main mirror that guides the subject luminous flux to the eyepiece optical system, a focusing plate that is a part of the eyepiece optical system and forms a subject image from the subject luminous flux reflected by the main mirror, and the focus According to the operation of the second imaging means for obtaining the subject image formed on the plate, the display means capable of displaying the subject image obtained by the first or second imaging means, and the operation of the main mirror, Selecting means for selecting a display image of the display means, and the focusing screen forms the subject image and performs observation according to observation by the eyepiece optical system; and Shape the subject image And a second focusing screen for performing display according to the display by the display means, and in conjunction with the selection of the selection means, either the first focusing screen or the second focusing screen One of them is arranged on the subject image forming plane.

  The invention according to claim 8 is the invention according to claim 7, wherein the first focusing screen is a focusing screen for displaying a focus frame.

  The invention according to claim 9 is the invention according to claim 7, wherein the selecting means is a movable reflecting mirror disposed between the object image imaging plane and an eyepiece optical system. And

  According to the present invention, it is possible to provide a camera capable of live view display in which a photographer can easily view a subject image in either the finder view mode or the live view mode.

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

  FIG. 1 is an external perspective view showing a configuration of a single-lens reflex digital camera according to an embodiment of the present invention.

  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 20. A desired lens barrel 10 is detachably set with respect to the front surface.

  On the upper surface of the camera body 20, a release button 21, a mode dial 22, a power switch lever 23, a control dial 24, a mode switching lever 35, and the like are provided.

  The release button 21 is a button for executing a shooting preparation operation and an exposure operation. The release button 21 is composed of a two-stage switch of a first release switch and a second release switch. When the release button 21 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 21 is fully pressed, the second release switch is turned on and the exposure operation is executed.

  The mode dial 22 is an operation member for setting a shooting mode at the time of shooting. When the mode dial 22 is rotated in a predetermined direction, a shooting mode at the time of shooting is set. The power switch lever 23 is an operation member for turning on / off the power of the camera 1. By turning the power switch lever 23, the main power supply of the camera 1 is switched on / off.

  The control dial 24 is a member for setting shooting information. By operating the control dial 24, various settings are performed during shooting. The mode switching lever 35 serving as a switching unit is configured as an operation lever that switches between the finder view mode and the live view mode. Details of this switching operation will be described later.

  On the back surface of the body unit 20, a liquid crystal monitor 26 constituting a display means (external display device) for displaying captured images, menus, etc., a playback button 27, a menu button 28, a cross key 30, and an OK. A button 31, an eyepiece optical system finder 33, and the like are arranged.

  The playback button 27 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 an SDRAM 62 or a recording medium 63 described later. The menu button 28 is a button for displaying a menu screen on the liquid crystal monitor 26. 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 30 and can determine the item selected with the OK button 31. For example, switching between an auto focus (AF) mode in which a photographing lens is driven in accordance with an output of an AF sensor unit 71 described later and a manual focus (MF) mode in which a photographing lens is driven in accordance with a manual operation of a photographer, Included in this menu item.

  FIG. 2 is a block diagram showing the system configuration of the camera according to one embodiment of the present invention.

  In FIG. 2, the lens barrel 10 can be detachably mounted via a lens mount (not shown) provided on the front surface of the camera body 20. 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 later-described body control microcomputer 80 via the communication connector 40, and is controlled according to a command from the body control microcomputer 80.

  On the other hand, the camera body 20 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 (selecting means) 51 that is a movable mirror, and is then focused on a focusing screen 56 and the above-described first. The eyepiece lens 57 is reached through the second to fourth reflecting mirrors 52 to 54 (see FIG. 3) and the like constituting the finder optical system 50 together with the one reflecting mirror 51. 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. 2, the first reflection mirror 51 is shown separately, but constitutes a finder optical system (observation optical system) 50 together with the second to fourth reflection mirrors and the like.

  Behind the first reflecting mirror 51 on the optical axis is 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, and is composed of a CCD or the like. An imaging element 67 for photographing as a first imaging element is provided. 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.

  In the finder optical system 50, as will be described later, a photometric sensor 63 is provided in the vicinity of the second reflecting mirror 52, and a display imaging device 61 as a second imaging device is provided in the vicinity of the fourth reflecting mirror 54. In addition, a mode changeover switch 64 is provided. The photometric sensor 63 is connected to the body control microcomputer 80 via a photometric circuit 87 described later, and is controlled in accordance with the command. The mode change switch 64 corresponds to the mode change lever 35, and details thereof will be described later.

  The display image sensor 61 and the image sensor 67 are connected via an interface circuit 81 to an image processing controller 82 that includes a compression unit and performs image processing. The image processing controller 82 is connected to the above-described liquid crystal monitor 26, SDRAM 83, Flash Memory 84, recording medium 85, and the like, which are temporary storage memories 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 20 via a camera interface (not shown).

  The image processing controller 82 includes a photometric circuit 87 including the photometric sensor 63, an AF sensor drive circuit 72, a mirror drive mechanism 73, a shutter charge mechanism 75, a shutter control circuit 76, and a nonvolatile memory (EEPROM). A body control microcomputer (hereinafter abbreviated as “Bμcom”) 80 for controlling each part in the camera body 20 is also connected.

  The Bμcom 80 further includes 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, a battery 93 via a power supply circuit 92, and a communication connector. 40 is connected.

  The Bμcom 80 and Lμcom 15 are electrically connected via the communication connector 40 when the lens barrel 10 is mounted. As a digital camera, Lμcom 15 operates in cooperation with 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 for synchronizing with a strobe (not shown) 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 nonvolatile memory 88 is a storage unit that stores predetermined control parameters necessary for camera control as a storage area other than the SDRAM 83, the flash memory 84, and the recording medium 85 described above, 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, The switch group includes 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.

  Next, the operation of each part of the camera 1 configured as described above will be described.

  First, the interface circuit 81 is controlled by the image processing controller 82 in accordance with a command from the Bμcom 80, and image data is captured from the imaging element 67 for photographing. This image data is converted into a video signal by the image processing controller 82 and output and displayed on the liquid crystal monitor 26. The photographer can confirm the photographed image from the display image on the liquid crystal monitor 26.

  The image data is taken into the SDRAM 83 which is a temporary storage memory. The SDRAM 83 is used as a work area when image data is converted. The image data is set to be stored in the recording medium 85 after being converted into JPEG data.

  As described above, the mirror drive mechanism 73 is a mechanism for driving the first reflecting mirror 51 to the retracted position during imaging and the observed position during observation. When the first reflection mirror 51 is at the observation position by the mirror drive mechanism 73, the light beam from the photographing lens 11 is divided and guided to the AF sensor unit 71 side and the second to fourth reflection mirrors 52 to 55 side.

  The output from the AF sensor in the AF sensor unit 71 is transmitted to the Bμcom 80 via the AF sensor driving circuit 72, and a known distance measurement process is performed. Further, a part of the image forming light beam of the focusing screen 56 passes through the second reflecting mirror 52 and is guided to the photometric sensor 63. A well-known photometric process is performed in the photometric circuit 87 based on the detected light amount.

  When the shutter control circuit 76 receives a signal for controlling the driving of the shutter from the Bμcom 80, the shutter 66 is controlled based on the signal. In addition, the operation of the first reflecting mirror 51 is controlled by the mirror drive mechanism 73 in the same manner as the shutter 66 is controlled.

  FIG. 3 is a perspective view showing the configuration of the finder optical system of the camera in one 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 33, that is, a first reflecting mirror that is a main mirror. 51, a second reflecting mirror 52, a third reflecting mirror 53, a fourth reflecting mirror 54, a focusing screen (screen mat) 56 as a focusing plate, 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. As shown in the figure, the first reflecting mirror 51 observes the light beam incident from the photographing lens 11 in the direction of the second reflecting mirror 52, which is an angle of about 90 ° with respect to the optical axis of the photographing lens 11, as shown in the figure. Reflected rightward when viewed from the lens barrel 10 side of the camera body 20. At the time of imaging, the light beam is retracted from the imaging optical path and operates so that the light flux from the subject is guided to an imaging element (not shown) disposed behind the first reflection mirror 51.

  The light beam reflected by the reflecting surface of the first reflecting mirror 51 enters the second reflecting mirror 52 through the focusing screen 56. The second reflection mirror 52 is disposed on the reflection optical axis from the first reflection mirror 51, and the reflection surface is inclined at a predetermined angle with respect to the reflection optical axis of the first reflection mirror 51. Yes. The reflected light beam from the first reflecting mirror 51 incident on the second reflecting mirror 52 is reflected at an angle of approximately 90 ° with respect to the reflected optical axis from the first reflecting mirror 51, that is, upward of the camera body 20. 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 toward the left direction of the camera body 20 by the reflecting surface of the third reflecting mirror 53. 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 rotatable fourth reflection 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 as an optical image. The focusing screen 56 has a diffusing surface for diffusing the light beam. Are arranged so as to be movable in the direction of the arrow B in the figure.

  The second reflection mirror 52 is a half mirror. A photometric sensor 63 that measures the brightness of the subject is disposed on the back side of the reflecting surface of the second reflecting mirror 52. On the other hand, on the back surface side of the reflection surface of the fourth reflection mirror 54, a display image sensor 61 as a first image pickup unit including an imaging lens 60 and a CCD is disposed. The display image sensor 61 is 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 33).

  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. 4 is a view showing the moving mechanism of the focusing screen 56 described above.

  A focusing screen 56 is a first focusing screen provided with a plurality of (three in FIG. 4) focus frame display lines 105 and photometric range display lines 106 (hereinafter referred to as screen (1) and screen 1). 101) and a screen 2 (hereinafter referred to as screen (2)) 102, which is the second focusing plate not provided with the display line or the like, are fixed to the screen frame 100. In this case, the screen (1) 101 and the screen (2) 102 are fixed to the screen frame 100 with their longitudinal directions adjacent to each other.

  A rack gear 103 for allowing the focusing screen 56 to move is formed on one side in the longitudinal direction of the screen frame 100. The rack gear 103 meshes with a gear train 110 composed of a plurality of gears, and moves the focusing screen 56 in the direction of the arrow B in the figure. The gear train 110 is provided below the rotatable fourth reflecting mirror 54 and meshes with a gear tooth portion 111 formed on the lower surface of the fan-like member 112 movable in the direction of arrow C in the figure. Yes. That is, when the fan-shaped member 112 moves in the direction of the arrow C in the figure, the gear train 110 meshed with the gear tooth portion 111 rotates, and the rack gear 103 meshes with the gear train 110, so that the focusing screen 56 moves in the direction of the arrow B Move to.

  Next, switching between the finder view mode and the live view mode will be described with reference to FIGS.

  5 and 6 are perspective views showing the driving mechanism of the fourth reflecting mirror 75 and the focusing screen 56. FIG. 5 is a diagram showing a state in which the fourth reflecting mirror 54 is opened in the viewfinder mode. FIG. 6 is a diagram showing a state in which the fourth reflection mirror 54 is closed in the live view mode. FIG. 7 is a view showing the mode switching lever 35 in the present embodiment.

  The fourth reflection mirror 54 is attached to a rotation shaft 116 in the vicinity of the eyepiece frame 115 to which the eyepiece (finder) 33 is attached (in the direction of arrow C in FIG. 5). A spring (toggle spring) 117 is wound around the rotating shaft 116, one end of which is abutted against a spring retaining pin 119 provided at a predetermined position on the eyepiece frame 115, and the other end is attached to the rotating shaft 116. It is hooked on a provided spring stop pin 118.

  Further, in the vicinity of the opening 115 a of the eyepiece frame 115, a mode change switch 64 corresponding to the mode change lever 35 is provided for detecting the open / close state of the fourth reflection mirror 54. The mode changeover switch 64 has a detecting portion 64a provided in a protruding shape.

  As shown in FIG. 6, it is detected that the fourth reflection mirror 54 is closed when the detection unit 64 a of the mode switch 64 is pushed by the fourth reflection mirror 54. That is, it is detected that the fourth reflection mirror 54 is located at the light shielding position, that is, the fourth reflection mirror 54 is located at the live view position. On the other hand, it can be seen that when the detection unit 64a is opened, the fourth reflection mirror 54 is opened. That is, it is detected that the fourth reflecting mirror 54 is located at a position where viewfinder view is possible.

  The spring 117 is urged in the opening direction, and normally, as shown in FIG. 5, the fourth reflection mirror 54 is in contact with the stopper 117. At this time, the light beam guided from the second reflection mirror 52 and the third reflection mirror 53 is reflected by the fourth reflection mirror 54 and reaches the eyepiece 33. This is the state in the finder view mode. The stopper 122 is fixed to an upper portion of a mirror box (not shown) in which the first reflecting mirror 51 and the like are housed.

  The protrusion 123 provided on the upper surface of the rotating shaft 116 is linked to the mode switching lever 35 shown in FIGS. 1 and 7 via an engaging member (not shown). That is, when the mode switching lever 35 is operated in the illustrated arrow D direction, the rotation shaft 116 rotates in conjunction with the operation direction, and the fourth reflection mirror 54 rotates in the arrow C direction shown in FIG. . Then, the gear of the gear train 110 meshed with the gear tooth portion 111 provided on the fan-shaped member 112 below the fourth reflecting mirror 54 rotates in a predetermined direction, and the focusing screen 56 is moved by the gear train 110 and the rack gear 103. It moves in the direction of arrow B shown in FIG.

  In this case, as shown in FIG. 7, the position indicated by the solid line of the mode switching lever 35 is the finder view mode (the eyepiece shutter is open), and the focusing screen 56 at this time is as shown in FIG. The screen (1) 101 is positioned on the observation optical path. On the other hand, the position indicated by the two-dot chain line in the mode switching lever 35 is the live view mode (the eyepiece shutter is closed). In this case, the focusing screen 56 has the screen (2) 102 positioned on the observation optical path as shown in FIG.

  In the camera 1 having such a configuration, when the photographer operates the mode switching lever 35 to switch to the viewfinder view mode, the rotation shaft 116 rotates in conjunction with the operation direction of the mode switching lever 35, and FIG. As shown, the fourth reflecting mirror 54 rotates to a position where it comes into contact with the stopper 122. As a result, the gear of the gear train 110 meshing with the gear tooth portion 111 provided at the lower portion of the fan-shaped member 112 rotates in a predetermined direction, and the focusing screen 56 is moved by the gear train 110 and the rack gear 103. A screen (1) 101 is positioned in the observation optical path.

  On the screen (1) 101, the focus frame display line 105 and the photometric range display line 106 are provided as described above. Therefore, the photographer can view the subject image through the eyepiece 33 with the focus frame display line 105 and the photometric range display line 106 superimposed on the subject image. In addition, since the detection unit 64a of the mode switch 64 is in the OFF state, the Bμcom 80 determines that the current mode is the finder view mode.

  On the other hand, when the photographer operates the mode switching lever 35 to switch to the live view mode, the rotating shaft 116 rotates in conjunction with the operation direction of the mode switching lever 35, and as shown in FIG. The fourth reflection mirror 54 rotates to a position where the opening 115a is closed. As a result, the gear of the gear train 110 meshing with the gear tooth portion 111 provided at the lower portion of the fan-shaped member 112 rotates in a predetermined direction, and the focusing screen 56 is moved by the gear train 110 and the rack gear 103. A screen (2) 102 is positioned in the observation optical path.

  As described above, the screen (2) 102 is not provided with any display such as a focus frame display line and a photometric range display line. Therefore, the photographer can view the subject image as it is through the eyepiece 33 via the screen (2) 102. Further, since the detection unit 64a of the mode changeover switch 64 is in the on state, the Bμcom 80 determines that the current mode is the live view mode.

  As described above, in the viewfinder mode, the display line and the subject image can be matched when checking when adjusting the focus, and in the live view mode, the subject image can be confirmed. Therefore, it is easy for the photographer to view because unnecessary display lines are not displayed.

  In the above-described embodiment, the mode switching lever 35 may be provided with a well-known lock mechanism or may be provided with a latching portion. The mode switching lever 35 and the rotating shaft 116 may be configured to have, for example, a spring-engaged overcharge mechanism or may be directly connected.

  In the above-described embodiment, the display imaging element 61 and the imaging imaging element 67 are described as being configured with a CCD. However, the present invention is not limited to this, and may be configured with an imaging element such as a CMOS. Of course.

  As mentioned above, although embodiment of this invention was described, in the range which does not deviate from the summary of this invention other than embodiment mentioned above, this invention can be variously modified.

FIG. 1 is an external perspective view showing a configuration of a single-lens reflex digital camera according to an embodiment of the present invention. It is a block diagram which shows the system configuration | structure of the camera which concerns on one Embodiment of this invention. 1 is a perspective view illustrating a configuration of a finder optical system of a camera according to an embodiment of the present invention. It is the figure shown about the moving mechanism of the focusing screen. FIG. 10 is a diagram showing a driving mechanism of the fourth reflection mirror 75 and a focusing screen 56, and shows a state in which the fourth reflection mirror 54 is opened in the viewfinder mode. FIG. 9 is a view showing a driving mechanism of the fourth reflection mirror 75 and a focusing screen 56, and shows a state in which the fourth reflection mirror 54 is closed in a live view mode. It is the figure which showed the mode switching lever 35 in one Embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Camera, 10 ... Lens barrel, 11 ... Shooting lens, 13 ... Lens drive mechanism, 14 ... Diaphragm drive mechanism, 15 ... Lens control microcomputer (L [mu] com), 20 ... Camera body, 21 ... Release button, 22 ... Mode dial, 26 ... LCD monitor, 33 ... finder (eyepiece), 35 ... mode switching lever, 40 ... communication connector, 50 ... finder optical system, 51 ... first reflecting mirror, 52 ... second reflecting mirror, 53 ... third Reflection mirror, 54 ... fourth reflection mirror, 56 ... focusing screen, 57 ... eyepiece, 60 ... imaging lens, 61 ... image sensor for display, 63 ... photometric sensor, 64 ... mode switch, 66 ... shutter, 67 ... Image sensor for photographing, 71... AF sensor unit, 72... AF sensor drive circuit, 73. Shutter charge mechanism, 76 ... shutter control circuit, 80 ... body control microcomputer (Bμcom), 81 ... interface circuit, 82 ... image processing controller, 85 ... recording medium, 87 ... photometry circuit, 100 ... screen frame, 101 ... screen DESCRIPTION OF SYMBOLS 1 (Screen (1)), 102 ... Screen 2 (Screen (2)), 103 ... Rack gear, 105 ... Focus frame display line, 106 ... Photometry range display line, 110 ... Gear train, 111 ... Gear tooth part, 112 ... Fan-shaped member.

Claims (9)

In cameras that can display live view,
An observation optical system for observing a subject image from the taking lens using an eyepiece optical system;
Display means for receiving the subject image by an image sensor and displaying the subject image on an external display device;
Selection means for selecting whether to observe the light beam from the subject image with the observation optical system or to display with the display means;
A first focusing screen for forming the subject image and performing observation according to observation by the observation optical system;
A second focusing screen for forming the subject image and causing display according to the display by the display means;
In conjunction with the selection by the selection means, focusing plate switching means for arranging one of the two focusing plates on the subject image forming plane;
A camera capable of live view display.   The camera capable of live view display according to claim 1, wherein the first focusing screen is a focusing screen for displaying a focus frame.   2. The camera capable of live view display according to claim 1, wherein the selection means is a movable reflection mirror disposed between the object image forming plane and an eyepiece optical system. In cameras that can display live view,
A taking lens,
A first image sensor that images a subject image that has passed through the photographing lens;
An observation optical system for observing the subject image formed on the focusing screen;
A second image sensor provided on the optical path side of the observation optical system;
Display means for displaying a subject image based on the output of the first image sensor or the second image sensor;
Selection means for selecting whether to observe the light beam from the subject image with the observation optical system or to display with the display means;
A first focusing plate, which is disposed at a position optically conjugate with the first imaging element, for forming the subject image and performing observation according to observation by the observation optical system;
A second focusing screen that is disposed at a position optically conjugate with the first image sensor, and that forms the subject image and performs display according to display by the display means;
In response to the selection of the selection means, switching means for switching so that either one of the first focusing screen and the second focusing screen is arranged on the subject image imaging plane;
A camera capable of live view display.   5. The camera capable of live view display according to claim 4, wherein the first focusing screen is a focusing screen for displaying a focus frame.   5. The camera capable of live view display according to claim 4, wherein the selecting means is a movable reflecting mirror disposed between the object image forming plane and an observation optical system. First imaging means for acquiring a subject image from a subject luminous flux that has passed through the photographing lens;
A main mirror capable of moving forward and backward with respect to the imaging optical path of the first imaging means, and guiding the subject light flux to an eyepiece optical system in the imaging optical path;
A focusing screen that is a part of the eyepiece optical system and forms a subject image from the subject light flux reflected by the main mirror;
Second imaging means for acquiring a subject image formed on the focusing screen;
Display means capable of displaying the subject image acquired by the first or second imaging means;
Selection means for selecting a display image of the display means according to the operation of the main mirror;
Comprising
The focusing screen forms a subject image and performs observation according to observation by the eyepiece optical system, and forms the subject image and performs display according to display by the display means. A second focusing screen, and one of the first focusing screen and the second focusing screen is arranged on the subject image forming plane in conjunction with the selection by the selection means. A camera that can display live view.   8. The camera capable of live view display according to claim 7, wherein the first focusing screen is a focusing screen for displaying a focus frame.   8. The camera capable of live view display according to claim 7, wherein the selecting means is a movable reflecting mirror disposed between the object image forming plane and an eyepiece optical system.

Images