JP2010185976A - Display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display for grasping which position light radiated from MEMS is on an image forming plate to a certain degree. <P>SOLUTION: A first auxiliary prism 130 is attached to a third face 12f of a penta prism 12. The first auxiliary prism 130 is a substantially quadrangular pyramid shape and is made from a material having the same density as the penta prism 12. A first side face 131a out of four triangular side faces possessed by the first auxiliary prism 130 adheres closely to a third face 12f. An optical scanning member 110 is attached to a second side face 131b being the rear face of the first side face 131a. An angle made by the second side face 131b and the image forming plate 120 is one so that laser light is reflected on the center O of an image forming region when the optical scanning member 110 is at a reference position. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a display device used to display information in a camera finder, and more particularly to a display device that displays information using an optical scanning member.

  2. Description of the Related Art Conventionally, an in-finder display device that displays information on a focusing plate on an optical path, that is, an imaging plate, using an optical scanning member, for example, a micro electro mechanical system (MEMS) is known. MEMS scans light on the light incident surface of the imaging plate and displays information on the imaging plate. The user observes this and recognizes various information (Patent Document 1).

JP 2006-259078 A

  However, MEMS is a device that simply vibrates in one or more directions according to the applied voltage and the frequency of the voltage. Therefore, if the position of the light irradiated from the MEMS on the imaging plate is not grasped to some extent, the MEMS is connected. Information cannot be accurately displayed on the image board.

  The present invention has been made in view of this problem, and an object of the present invention is to obtain a display device that can grasp to some extent the position on the imaging plate where the light emitted from the MEMS is located.

  A display device according to the present invention is a display device that displays information in a finder of an imaging device, and is provided on an optical path from an objective optical system to an eyepiece optical system, and has an effective surface through which light that can be visually recognized by a user passes. And an optical scanning member that scans the imaging plate with light, and a light detection member that is provided outside the effective surface of the imaging plate and can receive light from the optical scanning member. The member scans light according to the position of the light received by the light detection member.

  It is preferable that the optical scanning member scans light in the first and second directions orthogonal to each other, and the light detection member is provided in a direction corresponding to the first direction and the second direction on the imaging plate.

  The plurality of light detection members are preferably arranged in a direction corresponding to the first direction or the second direction.

  The plurality of light detection members are preferably arranged at right angles to a direction corresponding to the first direction or the second direction.

  It is desirable that the plurality of light detection members are arranged so as to form a plurality of rows in a direction corresponding to the first direction or the second direction.

  The imaging plate may have a light exit surface from which the subject image incident from the objective optical system exits, and the light scanning member may scan the light exit surface with light.

  A reflection surface that reflects the subject image, and is provided between the imaging plate and the eyepiece optical system and on the light emitting surface of the imaging plate, and guides the subject image emitted from the light emitting surface to the eyepiece optical system. It is preferable to further comprise a member.

  The reflecting member is a pentaprism, and the optical scanning member is preferably attached to the front surface surrounded by the roof surface and the third surface of the pentaprism.

  A reflection member attached to the front surface surrounded by the roof surface and the third surface of the pentaprism may further be provided, and the optical scanning member may scan the light toward the reflection member.

  The optical scanning member may be attached to the third surface of the pentaprism.

  The optical scanning member may be attached to a surface to which the eyepiece optical system in the pentaprism is attached.

  The pentaprism has a side surface parallel to the optical path through which the subject image passes, the reflection surface is the roof surface of the pentaprism, and the optical scanning member is provided on the side surface, and irradiates light toward the roof surface. May be.

  The reflecting member may be a pentamirror.

  The imaging plate may have a light incident surface on which the subject image is incident from the objective optical system, and the optical scanning member may scan the light incident surface.

  As described above, according to the present invention, it is possible to obtain a display device that can grasp to some extent the position of the light irradiated from the MEMS on the imaging plate.

It is sectional drawing which cut | disconnected and showed the SLR camera in this embodiment in the plane which passes along the optical axis. It is the perspective view which showed the pentaprism and the finder optical system. It is sectional drawing which cut | disconnected and showed the 1st display apparatus and the pentaprism by the plane which passes along the optical path of a SLR camera. It is the figure which looked at the image formation board from the pentaprism side. It is the graph which showed the vibration characteristic of the movable mirror (MEMS). It is a block diagram of the control apparatus of a 1st display apparatus. It is the figure which showed the time change of the laser beam irradiation position, and the time change of the analog signal which the photodetector output. It is the flowchart which showed the 1st control processing. It is the flowchart which showed the 2nd control processing. It is the figure which looked at the image formation board by 2nd Embodiment from the pentaprism side. It is the figure which showed the time change of the laser beam irradiation position, and the time change of the analog signal which the photodetector output. It is the flowchart which showed the 3rd control processing. It is the flowchart which showed the 4th control processing. It is sectional drawing which cut | disconnected and showed the 3rd display apparatus and the pentaprism by the plane which passes along the optical path of a SLR camera. It is sectional drawing which cut | disconnected and showed the 4th display apparatus and the pentaprism by the plane which passes along the optical path of a SLR camera. It is sectional drawing which cut | disconnected and showed the 5th display apparatus and the pentaprism by the plane which passes along the optical path of a SLR camera. It is sectional drawing which cut | disconnected and showed the 6th display apparatus and the pentaprism by the plane which passes along the optical path of a SLR camera. It is sectional drawing which cut | disconnected and showed the 7th display apparatus and the pentaprism by the plane which passes along the optical path of a SLR camera. It is sectional drawing which cut | disconnected and showed the 8th display apparatus and the pentaprism by the plane which passes along the optical path of a SLR camera.

  Hereinafter, a first display device 100 according to a first embodiment of the present invention will be described with reference to the drawings.

  An SLR camera 10 to which the first display device 100 is attached is shown in FIGS. In FIG. 2, the first display device 100 is omitted for explanation. An imaging lens 20 is attached to the front surface of the SLR camera 10, and an imaging plate 120 and a pentaprism 12 are provided inside the SLR camera 10. Hereinafter, for explanation, the direction parallel to the optical axis O of the imaging lens 20 is the Z direction (or Z axis), the direction orthogonal to the Z direction is the X direction (X axis), and the direction is orthogonal to the Z direction and the X direction. Is the Y direction (Y axis). When the SLR camera 10 is in the upright lateral position posture shown in FIG. 1, the Y direction is a direction parallel to the gravity direction. The positive Z-axis direction is the direction from the imaging lens 200 toward the subject image, and the positive Y-axis direction is the opposite direction to the gravity direction. When the user holds the camera toward the subject, the right direction when viewed from the user (right direction when the SLR camera 10 is viewed from the back side) is defined as the positive X-axis direction.

  The subject image incident from the imaging lens 20 is reflected by the return mirror 11 provided in the mirror box 15 and forms an image on the imaging plate 120.

  The imaging plate 120 is a rectangular parallelepiped plate-like member, and has an imaging region 121 for forming a subject image. The imaging region 121 is an effective surface through which light that can be visually recognized by the user passes. The imaging region 121 has a size of 20 mm in the longitudinal direction and 14 mm in the width direction.

  The subject image formed on the imaging plate 120 is reflected by the pentaprism 12 and guided to the finder optical system 13 provided at the upper back of the SLR camera 10.

  The user observes the subject image formed on the imaging plate 120 via the finder optical system 13.

  The pentaprism 12 is mainly composed of eight surfaces. The incident surface 12 a is provided on the bottom surface of the pentaprism 12 so as to face the imaging plate 120 and receives the subject image from the imaging plate 120. The subject image incident from the incident surface 12 a is reflected toward the front of the pentaprism 12 by the first roof surface 12 b and the second roof surface 12 c forming the top of the pentaprism 12. The reflected subject image is reflected toward the back surface of the pentaprism 12 by the front reflection surface 12 d provided at the front portion of the pentaprism 12. An exit surface 12e is provided on the back surface of the pentaprism 12, and the subject image irradiated from the front reflecting surface 12d is emitted toward the finder optical system 13. The exit surface 12e is perpendicular to the entrance surface 12a. A third surface 12f is provided so as to be surrounded by the first roof surface 12b, the second roof surface 12c, and the front reflection surface 12d. Further, a right side surface 12g and a left side surface 12h are provided so as to be perpendicular to the incident surface 12a. The right side surface 12g intersects the front reflecting surface 12d, the first roof surface 12b, and the exit surface 12e, and the left side surface 12h intersects the front reflecting surface 12d, the second roof surface 12c, and the exit surface 12e. The line of intersection between the first roof surface 12b and the second roof surface 12c forms a ridge line 12i.

  When the user presses a shutter release button (not shown) halfway, the SLR camera 10 performs a photometric operation and an autofocus operation. Thereby, the shutter speed, aperture value, and other shooting conditions are determined, and the focus of the imaging lens 20 is focused on the subject.

  When the user fully presses the shutter release button, the SLR camera 10 raises the return mirror 11 and guides the subject image to the image sensor 14. The image sensor 14 converts the subject image into an electrical signal and outputs it. The electric signal is subjected to image processing and the like, and is stored in a recording medium as an image file.

  Next, the first display device 100 will be described with reference to FIGS. FIG. 4 is a view of the imaging plate 120 as viewed from the pentaprism 12 side, in which a finder optical system 13 is provided in the Z-axis negative direction and a return mirror 11 is provided in the Y-axis negative direction. The first display device 100 is provided around the pentaprism 12.

  A relationship between an image formed on the imaging plate 120 and an image observed by the user through the finder optical system will be described. The positive Z-axis direction of the image formed on the imaging plate 120 is the Y-axis direction in the observation image, and the positive X-axis direction of the image formed on the imaging plate 120 is the negative X-axis direction in the observation image. . That is, when the user observes the imaging plate 120 through the finder optical system 13, the Z-axis positive direction in FIG. 4 corresponds to the Y-axis positive direction in FIG.

  The first display device 100 mainly includes an optical scanning member 110, an imaging plate 120, a first X-direction light detection member 140 and a first Z-direction light detection member 150 attached to the imaging plate 120. Composed.

  A first X-direction light detection member 140 is attached outside the imaging region 121 and in the positive X-axis direction of the imaging plate 120. The first X-direction light detection member 140 includes first to ninth X-direction photodetectors PDx00, PDx01, PDx02, PDx10, PDx11, PDx12, PDx20, PDx21, and PDx22. These X-direction photodetectors are arranged in the first to ninth order from the negative direction of the X axis and the Z axis in the positive direction to form a 3 × 3 square matrix.

  A first Z-direction light detection member 150 is attached outside the imaging region 121 and in the negative Z-axis direction of the imaging plate 120. The first Z-direction light detection member 150 includes first to ninth Z-direction photodetectors PDz00, PDz01, PDz02, PDz10, PDz11, PDz12, PDz20, PDz21, and PDz22. These photo detectors in the Z direction are arranged in the first to ninth order from the negative direction of the X axis to the positive direction and from the positive direction of the Z axis to the negative direction, and are arranged in a 3 × 3 square matrix. Form. Each X-direction and Z-direction photo detector emits a signal when it receives light.

  The optical scanning member 110 is mainly composed of a laser diode light source 111, a collimating lens 113, and a movable mirror 112. The laser diode light source 111 irradiates the collimating lens 113 with laser light. The collimating lens 113 substantially collimates the laser light and irradiates the movable mirror. The movable mirror 112 is swingable about two axes and reflects the laser beam toward the imaging plate 120. When the swing of the movable mirror 112 is stopped, that is, when an AC signal described later is not applied to the movable mirror 112, the optical scanning member 110 is in the reference position. When the optical scanning member 110 is at the reference position, the laser light is reflected to the center O of the imaging region 121. The laser diode light source 111 and the collimating lens 113 are selected so that the diameter (spot diameter) of the laser light on the imaging region 121 is 30 μm, and the spot diameter is adjusted. The movable mirror 112 is configured by MEMS. The swing angle of the movable mirror 112 in the X-axis direction of the imaging plate 120 is 23.9 deg, and the swing angle of the movable mirror 112 in the Z-axis direction of the imaging plate 120 is 17.3 deg. Further, the distance from the optical scanning member 110 to the center O of the imaging region 121 when the optical scanning member 110 is at the reference position, that is, the optical path length in terms of air is 23 mm (refractive index n = 1. 5).

  The movable mirror 112 has the resonance characteristics shown in FIG. The deflection angle becomes the largest at a predetermined resonance frequency. In order to stabilize the driving, the driving is performed at a frequency higher than the limit frequency. The limit frequency is a limit value set to prevent the drive frequency from going too far to the resonance frequency when the drive frequency of the movable mirror 112 is changed from a high frequency toward the resonance frequency in the lower direction. In order to stabilize the deflection angle, the movable mirror 112 is driven at an initial frequency higher than the resonance frequency immediately after the start of driving. It takes a time of about several tens of ms until the deflection angle is stabilized.

  A first auxiliary prism 130 is attached to the third surface 12 f of the pentaprism 12. The first auxiliary prism 130 has a substantially quadrangular pyramid shape and is made of a material having the same refractive index as that of the pentaprism 12. Of the four triangular side surfaces of the first auxiliary prism 130, the first side surface 131a is in close contact with the third surface 12f. The optical scanning member 110 is attached to the second side surface 131b that is the back surface of the first side surface 131a. The angle formed between the second side surface 131 b and the imaging plate 120 is an angle such that the laser beam is reflected to the center O of the imaging region 121 when the optical scanning member 110 is at the reference position.

  The optical scanning member 110 irradiates laser light intermittently from the negative X-axis direction to the positive direction on the imaging plate 120 by swinging the movable mirror 112. From the X axis minimum position to the maximum position of the imaging region 121, the laser beam has 640 irradiation points. While the laser light is irradiated from the X-axis negative direction toward the positive direction, the laser light blinks according to information to be displayed on the imaging region 121.

  When the laser light reflected by the movable mirror 112 swings on the imaging plate 120 to the maximum position in the X-axis positive direction, the movable mirror 112 swings so that the laser light returns to the minimum position in the X-axis negative direction. Then, after the movable mirror 112 swings so that the laser beam is irradiated slightly in the negative Z-axis direction from the previously irradiated line, the laser beam is irradiated from the minimum position in the negative X-axis direction to the maximum position in the positive X-axis direction. Thus, the movable mirror 112 swings again. This is repeated 480 times in the Z-axis direction. That is, the resolution of the first display device 100 is 640 dots in the X-axis direction and 480 dots in the Z-axis direction, which corresponds to VGA.

  The control device of the first display device 100 will be described with reference to FIG.

  The control device includes a microcomputer 161, an oscillator 162, an X direction inverter 163, an X direction positive voltage amplifier 164, an X direction negative voltage amplifier 165, a counter 166, a Z direction inverter 167, a Z direction positive voltage amplifier 168, and a Z direction negative voltage. Mainly composed of an amplifier 169.

  The microcomputer 161 is connected to each photodetector and controls the oscillator 162, the Z-direction positive voltage amplifier 168, and the Z-direction negative voltage amplifier 169 in accordance with an analog signal received from the photodetector that has received light. A frequency control signal is transmitted to the oscillator 162 to control the amplitude in the X-axis direction. In order to control the amplitude in the Z-axis direction, a voltage control signal is transmitted to the Z-direction positive voltage amplifier 168 and the Z-direction negative voltage amplifier 169.

  The first to ninth X-direction photodetectors PDx00, PDx01, PDx02, PDx10, PDx11, PDx12, PDx20, PDx21, PDx22, and the first to ninth Z-direction photodetectors PDz00, PDz01, PDz02, PDz10, PDz11, PDz12 The microcomputer 161 includes state variables for recording the states of analog signals received from the PDz20, PDz21, and PDz22. For the first to ninth X-direction photo detectors PDx00, PDx01, PDx02, PDx10, PDx11, PDx12, PDx20, PDx21, PDx22, the first to ninth X-direction state variables Vx00, Vx01, Vx02, Vx10, Vx11 , Vx12, Vx20, Vx21, and Vx22 respectively correspond to the first to ninth Z-direction photodetectors PDz00, PDz01, PDz02, PDz10, PDz11, PDz12, PDz20, PDz21, and PDz22. Z-direction state variables Vz00, Vz01, Vz02, Vz10, Vz11, Vz12, Vz20, Vz21, and Vz22 correspond to each other.

  The oscillator 162 transmits an AC signal having a frequency corresponding to the frequency control signal from the microcomputer 161 to the X-direction positive voltage amplifier 164, the X-direction inverter 163, and the counter 166. As the oscillator 162, a VCO (Voltage Controlled Oscillator) or a DDS (Direct Digital Synthesizer) is used.

  The X direction inverter 163 inverts the phase of the received AC signal and transmits the inverted AC signal to the X direction negative voltage amplifier 165. The X direction positive voltage amplifier 164 and the X direction negative voltage amplifier 165 amplify the AC signal to a voltage sufficient to drive the movable mirror 112 and transmit the AC signal to the movable mirror 112 included in the MEMS 111.

  The movable mirror 112 oscillates at an oscillation frequency corresponding to the frequency of the AC signal from the X direction positive voltage amplifier 164 and the X direction negative voltage amplifier 165. When the frequency of the AC signal is increased, the oscillation frequency of the movable mirror 112 is increased and the amplitude is decreased. When the frequency of the AC signal is lowered, the oscillation frequency of the movable mirror 112 is lowered and the amplitude is increased. In this way, the laser beam reflected by the movable mirror 112 is scanned on the imaging plate 120 in the X axis positive / negative direction.

  The counter 166 divides the frequency of the signal transmitted from the oscillator 162 by 3/4. Then, the divided signal is transmitted to the Z direction positive voltage amplifier 168 and the Z direction inverter 167. Similarly to the X direction inverter 163, the Z direction inverter 167 transmits the inverted AC signal to the Z direction negative voltage amplifier 169. The Z-direction positive voltage amplifier 168 and the Z-direction negative voltage amplifier 169 change the voltage of the received AC signal, that is, the amplitude in accordance with the voltage control signal from the microcomputer 161, and then transmit it to the movable mirror 112 provided in the MEMS 111.

  The movable mirror 112 oscillates with an oscillation frequency corresponding to the frequency of the AC signal from the Z direction positive voltage amplifier 168 and the Z direction negative voltage amplifier 169 and an amplitude corresponding to the voltage. When the amplitude of the AC signal is increased, the amplitude of the movable mirror 112 is increased. When the amplitude of the AC signal is lowered, the amplitude of the movable mirror 112 is reduced. In this way, the laser beam reflected by the movable mirror 112 is scanned on the imaging plate 120 in the positive and negative Z-axis directions.

  The X direction positive voltage amplifier 164, the X direction negative voltage amplifier 165, the Z direction positive voltage amplifier 168, and the Z direction negative voltage amplifier 169 apply an AC signal to the movable mirror 112 simultaneously. For this reason, the laser light reflected by the movable mirror 112 is shaken simultaneously on the imaging plate 120 in the X-axis positive / negative direction and the Z-axis positive / negative direction. That is, the movable mirror 112 is scanned with laser light on the imaging plate 120 by raster scanning.

  When driving in the X direction and driving in the Z direction are performed at the same time, since the control using the resonance phenomenon is performed in the driving in the X direction, the amplitude is increased to the required amount even if the driving frequency is changed in the driving in the Z direction. And the resonance phenomenon cannot be used. Therefore, in driving in the Z direction, the amplitude is controlled by changing the voltage.

  The first control unit that scans the laser beam in the X-axis and Z-axis directions on the imaging plate 120 will be described with reference to FIGS.

  First, a means for scanning a laser beam in the X-axis direction on the imaging plate 120 will be described. For simplicity, description will be made using only the fourth, fifth, and sixth X-direction photodetectors PDx10, PDx11, and PDx12.

  The uppermost curve in FIG. 7 shows the time change of the laser beam irradiation position on the imaging plate 120 in the X-axis direction. When the laser light is irradiated far beyond the imaging region 121 and when it is irradiated only within the imaging region 121, the shape of information formed in the imaging region 121, such as character information and image information, is destroyed. The user cannot recognize the information. Therefore, the first control unit is executed so that the laser beam is scanned within a range that slightly removes the imaging region 121.

  When the laser beam outside the imaging region 121 enters the fourth X-direction photodetector PDx10, the fourth X-direction photodetector PDx10 transmits an analog signal to the microcomputer 161.

  The microcomputer 161 receives the analog signal and turns on the fourth X-direction state variable Vx10.

  Further, when the laser light is incident on the fifth and sixth X-direction photodetectors PDx11 and PDx12, the fifth and sixth X-direction photodetectors PDx11 and PDx12 transmit analog signals to the microcomputer 161. The microcomputer 161 receives the analog signal and turns ON the fifth and sixth X-direction state variables Vx11 and Vx12.

  Next, when the laser beam turns back at the maximum position in the X-axis positive direction and starts moving in the X-axis negative direction, it enters the sixth X-direction photodetector PDx12. When the sixth X-direction photodetector PDx12 that has received the laser beam transmits an analog signal to the microcomputer 161, the microcomputer 161 receives the analog signal and turns off the sixth X-direction state variable Vx12.

  Further, when the laser light is incident on the fifth and fourth X-direction photodetectors PDx11 and PDx10, the fifth and fourth X-direction photodetectors PDx11 and PDx10 transmit analog signals to the microcomputer 161. The microcomputer 161 receives the analog signal and turns off the fifth and fourth X-direction state variables Vx11 and Vx10.

  The time required for the laser light to leave the imaging region 121 and return to the imaging region 121 is shorter than half the period of the movable mirror 112 in the X-axis direction, that is, less than a half period.

  On the other hand, when the X-direction state variable in the microcomputer 161 is OFF, the laser beam may move from the maximum position in the X-axis positive direction toward the imaging region 121. At this time, the laser light is not sensed within a half cycle of the movable mirror 112 after each X-direction photodetector first senses the laser light. In other words, each X direction photodetector does not detect the laser beam twice within a half cycle of the movable mirror 112. Therefore, the microcomputer 161 changes the X-direction state variable that was turned ON when first sensed to OFF, and waits for an analog signal from the X-direction photodetector again.

  A first control process for scanning a laser beam in the X-axis direction on the imaging plate 120 will be described with reference to FIG. The first control process is executed when the power of the SLR camera 10 is turned on, and performs control such that the laser beam is scanned within the range from the imaging region 121 to the fifth X-direction photodetector PDx11.

  First, in step S801, an initial frequency is set.

  In step S802, an AC signal is applied to the movable mirror 112, and the movable mirror 112 is driven at an initial frequency.

  In step S803, the process is stopped for 20 ms until the amplitude of the movable mirror 112 is stabilized.

  In step S804, the movable mirror 112 is driven at a drive frequency that does not fall below the resonance frequency and the limit frequency. Then, the laser diode light source 111 emits laser light toward the movable mirror 112. Thereby, the laser beam is emitted from the optical scanning member 110. Since the laser beam is irradiated after the amplitude of the movable mirror 112 is stabilized, power can be saved.

  In step S805, it is determined whether the fourth X-direction photo detector PDx10 is turned on. When the fourth X-direction photo detector PDx10 is turned on, the process proceeds to step S807. When the fourth X-direction photo detector PDx10 is not turned on, it can be determined that the laser beam is not irradiated to the fourth X-direction photo detector PDx10 and the laser beam is irradiated only in the imaging region 121. Therefore, the process proceeds to step S806.

  In step S806, the microcomputer 161 transmits a frequency control signal to the oscillator 162 to lower the frequency of the AC signal generated by the oscillator 162. Thereby, the oscillation frequency of the movable mirror 112 is lowered, and the amplitude of the movable mirror 112 is increased. Then, step S805 is executed again.

  On the other hand, in step S807, it is determined whether or not the microcomputer 161 has received an analog signal from the fourth X-direction photodetector PDx10 within a half cycle of the AC signal.

  When the analog signal is not received within the half cycle of the AC signal, it is assumed that the laser light is moving from the maximum position in the positive direction of the X axis toward the imaging region 121. Therefore, the process returns to step S805, changes the fourth X-direction state variable Vx10 to OFF, and again waits for an analog signal from the fourth X-direction photodetector PDx10.

  When the analog signal is received within the half cycle of the AC signal, it is assumed that the laser beam is turned toward the imaging region 121 by turning back at the maximum position in the positive direction of the X axis. Therefore, the process proceeds to step S808, and the fourth, fifth, and sixth X directions are received by the first analog signal received from the fourth, fifth, and sixth X direction photodetectors PDx10, PDx11, and PDx12. The state variables Vx10, Vx11, and Vx12 are changed to ON, and the setting is changed so that the fourth, fifth, and sixth X-direction state variables Vx10, Vx11, and Vx12 are changed to OFF by the second analog signal.

  In the next step S809, it is determined whether or not the fourth X-direction photo detector PDx10 is turned on. When the fourth X-direction photo detector PDx10 is turned on, the process proceeds to step S810. When the fourth X-direction photo detector PDx10 is not turned on, it can be determined that the laser beam is not irradiated to the fourth X-direction photo detector PDx10 and the laser beam is still irradiating the imaging region 121. Therefore, the process again executes step S809 and waits for the laser light to irradiate the fourth X-direction photodetector PDx10.

  In the next step S810, it is determined whether or not the fifth X-direction photo detector PDx11 is turned on. When the fifth X-direction photo detector PDx11 is turned on, the process proceeds to step S813. When the fifth X-direction photo detector PDx11 is not turned ON, the laser beam is not irradiated to the fifth X-direction photo detector PDx 11, and the laser beam is not yet irradiated from the imaging region 121 to the fourth X-direction photo detector PDx10. It can be determined that the irradiation is within the range. Therefore, the process proceeds to step S811.

  In the next step S811, it is determined whether or not the fourth X-direction photo detector PDx10 is turned off. When the fourth X-direction photo detector PDx10 is OFF, the laser beam is not irradiated to the fifth X-direction photo detector PDx11, and the laser beam is folded back at the position of the fourth X-direction photo detector PDx10. It can be determined that the process returns to 121. Therefore, the process proceeds to step S812, where the microcomputer 161 transmits a frequency control signal to the oscillator 162, and lowers the frequency of the AC signal generated by the oscillator 162. Thereby, the oscillation frequency of the movable mirror 112 is lowered, and the amplitude of the movable mirror 112 is increased. Then, the process returns to step S809.

  On the other hand, when the fourth X-direction photo detector PDx10 is not turned off, it can be determined that the laser beam has not yet reached the fifth X-direction photo detector PDx11. Therefore, the process again executes step S810, and waits for the laser beam to reach the fifth X-direction photodetector PDx11 and irradiate.

  In step S813, it is determined whether or not the sixth X-direction photo detector PDx12 is turned on. When the sixth X-direction photo detector PDx12 is turned on, it can be determined that the laser beam has reached the sixth X-direction photo detector PDx12. This deviates from the laser light irradiation range controlled by the first control means. Therefore, the process proceeds to step S815.

  In step S815, the microcomputer 161 transmits a frequency control signal to the oscillator 162 to increase the frequency of the AC signal generated by the oscillator 162. As a result, the oscillation frequency of the movable mirror 112 is increased and the amplitude of the movable mirror 112 is decreased. And a process returns to step S809 again and observes the irradiation range of a laser beam.

  If the sixth X-direction photo detector PDx12 is turned off in step S813, it can be determined that the laser beam has not reached the sixth X-direction photo detector PDx12. Therefore, the process proceeds to step S814.

  In the next step S814, it is determined whether or not the fifth X-direction photo detector PDx11 is turned off. When the fifth X-direction photo detector PDx11 is OFF, the laser beam is not irradiated to the sixth X-direction photo detector PDx12, and the laser beam is folded back at the position of the fifth X-direction photo detector PDx11. It can be determined that the process returns to 121. This is within the laser light irradiation range controlled by the first control means. Therefore, the process returns to step S809 again to observe the laser light irradiation range.

  If the fifth X-direction photo detector PDx11 is not turned off in step S814, it can be determined that the laser beam is irradiated to the fifth X-direction photo detector PDx11 while not being irradiated to the sixth X-direction photo detector PDx12. This is within the laser light irradiation range controlled by the first control means. Therefore, the process returns to step S813, and the laser light irradiation range is observed again.

  With this process, the laser beam is irradiated in a range from the imaging region 121 to the fifth X-direction photodetector PDx11.

  A means for scanning the laser beam in the Z-axis direction on the imaging plate 120 will be described with reference to FIGS. The fourth, fifth, and sixth X-direction photodetectors PDx10, PDx11, and PDx12 in FIG. 7 are replaced with the fourth, fifth, and sixth Z-direction photodetectors PDz10, PDz11, and PDz12, respectively.

  Similarly to the X direction, the laser beam is irradiated in a range that slightly removes the imaging region 121 with respect to the Z direction. The irradiation position of the laser beam is grasped at 1/4 of the Z-axis direction period of the movable mirror 112, that is, at 1/4 period.

  The laser beam moves from the position where the Z-axis coordinate is 0 to the maximum position in the Z-axis direction at a quarter cycle. Therefore, the amplitude of the laser beam is determined in accordance with the position of the photodetector on which the laser beam is incident within ¼ period from the moment when the laser beam is incident on the first Z-direction photodetector PDz10.

  A second control process for irradiating laser light in the Z-axis direction on the imaging plate 120 will be described with reference to FIG. The second control process is executed when the power of the SLR camera 10 is turned on, and performs control such that the laser beam is scanned within the range from the imaging region 121 to the fifth Z-direction photo detector PDz11.

  Since the process from step S901 to S904 is the same as the process from step S801 to S804 of the first control process, description thereof is omitted.

  In step S905, it is determined whether or not the fourth Z-direction photo detector PDz10 is turned on. When the fourth Z-direction photo detector PDz10 is turned on, the process proceeds to step S907. When the fourth Z-direction photo detector PDz10 is not turned ON, it can be determined that the laser beam is not irradiated to the fourth Z-direction photo detector PDz10 and the laser beam is irradiated only within the imaging region 121. Therefore, the process proceeds to step S906.

  In step S906, the microcomputer 161 transmits a voltage control signal to the oscillator 162 to increase the voltage of the AC signal generated by the oscillator 162, in other words, the amplitude. As a result, the amplitude of the movable mirror 112 increases. Then, step S905 is executed again.

  Since the processing up to steps S907 and S908 is the same as the processing up to steps S807 and S808 of the first control processing, the description thereof is omitted.

  In the next step S909, it is determined whether or not the fourth Z-direction photo detector PDz10 is turned on. When the fourth Z-direction photo detector PDz10 is turned on, the process proceeds to step S910. When the fourth Z-direction photo detector PDz10 is not turned ON, it can be determined that the laser beam is not irradiated to the fourth Z-direction photo detector PDz10 and the laser beam is still irradiating the imaging region 121. Therefore, the process again executes step S909 and waits for the laser light to irradiate the fourth Z-direction photo detector PDz10.

  In the next step S910, it is determined whether a quarter cycle has elapsed from the moment when the laser light is incident on the first X-direction photo detector PDz10. If the time has elapsed, the process proceeds to step S911. If the time has not elapsed, step S910 is repeated to wait for a quarter period to elapse.

  In the next step S911, it is determined whether or not the fifth Z-direction photo detector PDz11 is turned on. When the fifth Z-direction photo detector PDz11 is turned on, the process proceeds to step S913. When the fifth Z-direction photo detector PDz11 is not turned ON, the laser beam is not irradiated to the fifth Z-direction photo detector PDz11, and the laser beam is not yet irradiated from the imaging region 121 to the fourth Z-direction photo detector PDz10. It can be determined that the irradiation is within the range. Therefore, the process proceeds to step S912.

  In the next step S912, the microcomputer 161 transmits a voltage control signal to the oscillator 162 to increase the voltage of the AC signal generated by the oscillator 162, in other words, the amplitude. As a result, the amplitude of the movable mirror 112 increases. Then, the process returns to step S909.

  In step S913, it is determined whether the sixth Z-direction photo detector PDz12 is turned on. When the sixth Z-direction photo detector PDz12 is turned on, it can be determined that the laser beam has reached the sixth Z-direction photo detector PDz12. This deviates from the laser light irradiation range controlled by the first control means. Therefore, the process proceeds to step S914.

  In the next step S <b> 914, the microcomputer 161 transmits a voltage control signal to the oscillator 162 to reduce the voltage of the AC signal generated by the oscillator 162, in other words, the amplitude. Thereby, the amplitude of the movable mirror 112 becomes small. And a process returns to step S909 again and observes the irradiation range of a laser beam.

  When the sixth Z-direction photo detector PDz12 is turned off in step S913, it can be determined that the laser beam has not reached the sixth Z-direction photo detector PDz12. Therefore, the process returns to step S909 again, and the irradiation range of the laser beam is observed.

  With this process, the laser beam is irradiated in a range from the imaging region 121 to the fifth Z-direction photodetector PDz11.

  By simultaneously performing the first control process and the second control process, the laser light reflected by the movable mirror 112 is simultaneously shaken in the X-axis positive / negative direction and the Z-axis positive / negative direction on the imaging plate 120. That is, the movable mirror 112 reflects the laser beam onto the image forming plate 120 by raster scanning.

  At this time, the first to third X direction photodetectors PDx00, PDx01, PDx02, and the seventh to ninth X direction photodetectors PDx20, PDx21, and PDx22 are driven in the Z direction in the same manner as the first control process. Perform the process. That is, the first control process is executed three times while the movable mirror 112 reflects an image of one frame on the imaging plate.

  At this time, the second to third Z-direction photo detectors PDz00, PDz01, PDz02 and the seventh to ninth Z-direction photo detectors PDz20, PDz21, PDz22 are driven in the X direction. A control process similar to the control process is executed. That is, the second control process is executed three times while the movable mirror 112 reflects an image of one frame on the imaging plate.

  Thus, the scanning range can be adjusted three times in the X direction and three times in the Z direction during one frame scanning, and the laser light irradiation range can be precisely controlled.

  According to the present embodiment, since the laser beam is irradiated onto the imaging region 121 from the pentaprism 12 side, it is possible to prevent the laser beam from directly entering the user's eyes. In addition, since the first display device 100 can be assembled and adjusted integrally with the optical system including the pentaprism 12, the eyepiece optical system can be reduced in size and cost.

  Furthermore, since the optical path length from the optical scanning member 110 to the imaging plate 120 can be shortened, the diameter of the laser beam emitted from the optical scanning member 110 can be reduced. Thereby, the diameter of the laser light irradiated to the imaging plate 120 becomes small, and information can be displayed with high resolution.

  Further, since the laser beam does not cross the ridge line 12i, it is not irregularly reflected by the ridge line 12i.

  Next, a second display device according to the second embodiment will be described with reference to FIGS. The same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted. FIG. 10 is a view of the imaging plate 120 as viewed from the pentaprism 12 side, in which a finder optical system 13 is provided in the positive Z-axis direction and an imaging lens 20 is provided in the negative Z-axis direction.

  The imaging plate 120 in the second display device will be described. The second embodiment differs from the first embodiment in the arrangement of the second X-direction light detection member 240 and the second Z-direction light detection member 250 attached to the imaging plate 120.

  A second X-direction light detection member 240 is attached outside the imaging region 121 and in the negative Z-axis direction of the imaging plate 120. The second X-direction light detection member 240 includes first to third X-direction photodetectors PDx0, PDxz1, and PDx2, and observes the irradiation position of the laser light in the X-axis direction. The first X-direction photodetector PDx0 is provided outside the imaging region 121 on the Z-axis negative direction Z-axis. The second and third X-direction photodetectors PDxz1 and PDx2 are provided outside the imaging region 121 in the negative Z-axis direction and the positive X-axis direction. The first to third X-direction photodetectors PDx0, PDxz1, and PDx2 are arranged in a line in the first to third order from the origin of the X axis in the positive direction.

  A second Z-direction light detection member 250 is attached outside the imaging region 121 and in the positive X-axis direction of the imaging plate 120. The second Z-direction light detection member 250 includes a first Z-direction photodetector PDz0, a second X-direction photodetector PDxz1, and a third Z-direction photodetector PDz2, and the irradiation position of the laser beam in the Z-axis direction. Observe. The first Z-direction photodetector PDz0 is provided on the X axis in the positive direction of the X axis and outside the imaging region 121. The third Z-direction photodetector PDz2 is provided outside the imaging region 121 in the Z-axis negative direction and the X-axis positive direction. The first Z-direction photo detector PDz0, the second X-direction photo detector PDxz1, and the third Z-direction photo detector PDz2 are sequentially arranged in a line from the origin of the Z axis toward the negative direction.

  A control device of the second display device will be described.

  Analog signals received from the first X-direction photodetector PDx0, the second X-direction photodetector PDxz1, the third X-direction photodetector PDx2, the first Z-direction photodetector PDz0, and the third Z-direction photodetector PDz2. The microcomputer 161 includes a state variable for recording the state. For the first X-direction photodetector PDx0, the second X-direction photodetector PDxz1, and the third X-direction photodetector PDx2, the first X-direction state variable Vx0, the first X-direction state variable Vxz1, 1 X-direction state variable Vx2 respectively corresponds to the first Z-direction photo detector PDz0 and the third Z-direction photo detector PDz2, and the first Z-direction state variable Vz0 and the third Z-direction state variable. Variables Vz2 correspond to each.

  The second control means of the second display device that scans the laser beam in the X-axis and Z-axis directions on the imaging plate 120 will be described with reference to FIGS.

  First, a means for scanning a laser beam in the X-axis direction on the imaging plate 120 will be described. For simplicity, description will be made using only the first, second, and third X-direction photodetectors PDx0, PDxz1, and PDx2. Similar to the scanning in the Z-axis direction in the first control means, the second control means grasps the irradiation position of the laser beam at 1/4 of the X-axis direction period of the movable mirror 112, that is, 1/4 period.

  A third control process executed by the second display device will be described with reference to FIG. The third control process is executed when the power of the SLR camera 10 is turned on, and controls to irradiate laser light within the range from the imaging region 121 to the second X-direction photo detector PDxz1. Since the processing from step S1101 to S1108 is the same as that from step S801 to S808 of the first control processing, description thereof will be omitted.

  In step S1109, it is determined whether or not the first X-direction photo detector PDx0 is turned on. When the first X-direction photo detector PDx0 is turned on, the process proceeds to step S1110. When the first X-direction photo detector PDx0 is not turned on, it can be determined that the laser beam has not been irradiated to the first X-direction photo detector PDx0. Therefore, the process executes step S1109 again and waits for the laser light to irradiate the first X-direction photo detector PDx0.

  In the next step S1110, it is determined whether or not a quarter period has elapsed from the moment when the laser light is incident on the first X-direction photodetector PDx0. If it has elapsed, the process proceeds to step S1111. If it has not elapsed, step S1110 is repeated to wait for a quarter period to elapse.

  In the next step S1111, it is determined whether or not the second X-direction photo detector PDxz1 is turned on. When the second X-direction photo detector PDxz1 is turned on, the process proceeds to step S1113. When the second X-direction photo detector PDxz1 is not turned ON, the laser beam is not irradiated to the second X-direction photo detector PDxz1, and the laser beam is folded back before the second X-direction photo detector PDxz1. It can be determined that the process returns to 121. Therefore, the process proceeds to step S1112, where the microcomputer 161 transmits a frequency control signal to the oscillator 162, and lowers the frequency of the AC signal generated by the oscillator 162. Thereby, the oscillation frequency of the movable mirror 112 is lowered, and the amplitude of the movable mirror 112 is increased. Then, the process returns to step S1109.

  In step S1113, it is determined whether the third X-direction photo detector PDx2 is turned on. When the third X-direction photo detector PDx2 is turned on, it can be determined that the laser beam has reached the third X-direction photo detector PDx2. This deviates from the laser light irradiation range controlled by the second control means. Therefore, the process proceeds to step S1114.

  In step S1114, the microcomputer 161 transmits a frequency control signal to the oscillator 162 to increase the frequency of the AC signal generated by the oscillator 162. As a result, the oscillation frequency of the movable mirror 112 is increased and the amplitude of the movable mirror 112 is decreased. Then, the process returns to step S1109 again to observe the laser light irradiation range.

  If the third X-direction photo detector PDx2 is not turned ON in step S1113, the laser beam is not irradiated to the third X-direction photo detector PDx2, and the laser beam is folded back at the position of the second X-direction photo detector PDxz1. It can be determined that the image has returned to the imaging region 121. This is within the irradiation range of the laser beam controlled by the second control means. Therefore, the process returns to step S1109 again to observe the irradiation range of the laser beam.

  With this process, the laser beam is irradiated in a range from the imaging region 121 to the second X-direction photodetector PDxz1.

  Then, the third control processing is executed by replacing the X axis with the Z axis for the first Z direction photo detector PDz0, the second X direction photo detector PDxz1, and the third Z direction photo detector PDz2. . However, since the resonance phenomenon cannot be used in driving in the Z direction, control based on the frequency of the applied voltage as in the X direction cannot be performed. The drive in the Z direction is controlled by changing the applied voltage.

  As a result, the laser light irradiation range can be observed in a short time and precisely controlled. In the present embodiment, adjustment is performed once in the X direction and once in the Y direction while displaying one frame. Since the region where the control process is performed in the X direction is outside the laser irradiation range (that is, outside the imaging region 121), the control process can be performed by always irradiating the laser other than when the power is turned on.

  A means for scanning laser light in the Z-axis direction on the imaging plate 120 will be described with reference to FIGS. The first and third X-direction photodetectors PDx0 and PDx2 in FIG. 11 will be described as the first and third Z-direction photodetectors PDz0 and PDz2, respectively. The description of the same configuration as the first to third control processes is omitted.

  A fourth control process for irradiating laser light in the Z-axis direction on the imaging plate 120 will be described with reference to FIG. The fourth control process is executed when the power of the SLR camera 10 is turned on, and performs control so that the laser beam is scanned within the range from the imaging region 121 to the second X-direction photo detector PDxz1.

  The processing from step S1301 to S1309 is substantially the same as the processing from step S901 to S909 of the second control processing. The fourth Z-direction photo detector PDz10 in steps S905 and S909 of the second control process is replaced with the first Z-direction photo detector PDz0 in steps S1305 and S1309, and description thereof is omitted.

  In step S1310, it is determined whether second X direction photo detector PDx1 is turned on. When the second X-direction photo detector PDxz1 is turned on, the process proceeds to step S1313. When the second X-direction photo detector PDxz1 is not turned ON, the laser beam is not irradiated to the second X-direction photo detector PDxz1, and the laser beam is not yet irradiated from the imaging region 121 to the first Z-direction photo detector PDz0. It can be determined that the irradiation is within the range. Therefore, the process proceeds to step S1311.

  In the next step S1311, it is determined whether or not the first Z-direction photo detector PDz0 is turned on. When the first Z-direction photo detector PDz0 is turned on, the process proceeds to step S1312. If the first Z-direction photo detector PDz0 is not turned ON, the process returns to step S1310.

  In the next step S1311, it is determined whether or not the first Z-direction photo detector PDz0 is turned off. When the first Z-direction photodetector PDz0 is OFF, the laser beam is not irradiated to the second X-direction photodetector PDxz1, and the laser beam is still from the imaging region 121 to the first Z-direction photodetector PDz0. It can be determined that the irradiation is within the range. Therefore, the process proceeds to step S1312, where the microcomputer 161 transmits a voltage control signal to the Z direction positive voltage amplifier 168 and the Z direction negative voltage amplifier 169, and the alternating current generated by the Z direction positive voltage amplifier 168 and the Z direction negative voltage amplifier 169 is generated. Increase signal voltage. As a result, the amplitude of the movable mirror 112 increases. Then, the process returns to step S1309.

  On the other hand, when the first Z-direction photo detector PDz0 is not turned off, it can be determined that the laser beam has not yet reached the second X-direction photo detector PDxz1. Therefore, the process again executes step S1310 and waits for the laser light to reach the second X-direction photo detector PDxz1.

  In step S1313, it is determined whether the third Z-direction photo detector PDz2 is turned on. When the third Z-direction photo detector PDz2 is turned on, it can be determined that the laser beam has reached the third Z-direction photo detector PDz2.

  In step S1313, it is determined whether the third Z-direction photo detector PDz2 is turned on. When the third Z-direction photo detector PDz2 is turned on, it can be determined that the laser beam has reached the third Z-direction photo detector PDz2. This deviates from the laser light irradiation range controlled by the second control means. Therefore, the process proceeds to step S1315.

  In step S1315, the microcomputer 161 transmits a voltage control signal to the Z direction positive voltage amplifier 168 and the Z direction negative voltage amplifier 169 to lower the voltage of the AC signal generated by the Z direction positive voltage amplifier 168 and the Z direction negative voltage amplifier 169. . Thereby, the amplitude of the movable mirror 112 becomes small. Then, the process returns to step S1309 again, and the irradiation range of the laser beam is observed.

  When the third Z-direction photo detector PDz2 is turned off in step S1313, it can be determined that the laser beam has not reached the third Z-direction photo detector PDz2. Therefore, the process proceeds to step S1314.

  In the next step S1314, it is determined whether or not the second X-direction photo detector PDxz1 is turned off. When the second X-direction photo detector PDxz1 is OFF, the laser beam is not irradiated to the third Z-direction photo detector PDz2, and the laser beam is folded back at the position of the second X-direction photo detector PDxz1. It can be determined that the process returns to 121. This is within the laser light irradiation range controlled by the first control means. Therefore, the process returns to step S1309 again, and the irradiation range of the laser beam is observed.

  If the second X-direction photo detector PDxz1 is not turned off in step S1314, it can be determined that the laser beam is irradiated to the second X-direction photo detector PDxz1, while not being irradiated to the third Z-direction photo detector PDz2. This is within the irradiation range of the laser beam controlled by the second control means. Therefore, the process returns to step S1313, and the irradiation range of the laser beam is observed again.

  As a result, the laser beam is irradiated in a range from the imaging region 121 to the second X-direction photodetector PDxz1.

  Similar to the first control process and the second control process, the third control process and the fourth control process are performed simultaneously, so that the laser beam is directed in the X axis positive / negative direction and the Z axis positive / negative direction on the imaging plate 120. Shake at the same time. That is, the movable mirror 112 reflects the laser beam onto the image forming plate 120 by raster scanning.

  According to the present embodiment, since the laser beam is irradiated onto the imaging region 121 from the pentaprism 12 side, it is possible to prevent the laser beam from directly entering the user's eyes. In addition, since the first display device 100 can be assembled and adjusted integrally with the optical system including the pentaprism 12, the eyepiece optical system can be reduced in size and cost.

  Next, a third display device according to the third embodiment will be described with reference to FIG. The same components as those in the first and second embodiments are denoted by the same reference numerals and description thereof is omitted.

  An auxiliary mirror 30 is attached to the third surface 12 f of the pentaprism 12. The auxiliary mirror 30 has a shape in which two rectangular plane mirrors are connected such that the mirror surface side forms an inferior angle, and has a first mirror surface 31 and a second mirror surface 32. One side of the second mirror surface 32 is attached to the third surface 12 f, and the opposite side of the side is connected to the first mirror surface 31. The first mirror surface 31 and the second mirror surface 32 face the third surface 12f.

  The optical scanning member 110 by the third display device irradiates laser light toward the first mirror surface 31. The first mirror surface 31 reflects the laser light toward the second mirror surface 32. The second mirror surface 32 reflects the laser beam toward the third surface 12f. The laser beam incident on the prism from the third surface 12f is irradiated onto the imaging plate 120. The positional relationship among the optical scanning member 110, the first mirror surface 31, the second mirror surface 32, and the prism so that the laser beam is applied to the center O of the imaging region 121 when the optical scanning member 110 is at the reference position. Is determined. The swing angle of the movable mirror 112 in the X-axis direction of the imaging plate 120 is 12.6 deg, and the swing angle of the movable mirror 112 in the Z-axis direction of the imaging plate 120 is 16.8 deg. The distance from the optical scanning member 110 to the center O of the imaging region 121 when the optical scanning member 110 is at the reference position, that is, the optical path length is 39 mm.

  According to the present embodiment, since the laser beam is irradiated onto the imaging region 121 from the pentaprism 12 side, it is possible to prevent the laser beam from directly entering the user's eyes. In addition, since the first display device 100 can be assembled and adjusted integrally with the optical system including the pentaprism 12, the eyepiece optical system can be reduced in size and cost.

  Further, since the laser beam does not cross the ridge line 12i, it is not irregularly reflected by the ridge line 12i.

  Next, a fourth display device according to the fourth embodiment will be described with reference to FIG. The same components as those in the first to third embodiments are denoted by the same reference numerals and description thereof is omitted.

  An auxiliary mirror 30 is attached to the third surface 12 f of the pentaprism 12. The auxiliary mirror 30 is a single plane mirror, and has a third mirror surface 41 facing the third surface 12f.

  The optical scanning member 110 according to the third display device irradiates laser light toward the third mirror surface 41. The third mirror surface 41 reflects the laser light toward the third surface 12f. The laser beam incident on the prism from the third surface 12f is irradiated onto the imaging plate 120. When the optical scanning member 110 is at the reference position, the positional relationship among the optical scanning member 110, the auxiliary mirror 30, and the prism is determined so that the laser beam is irradiated onto the center O of the imaging region 121. The swing angle of the movable mirror 112 in the X-axis direction of the imaging plate 120 is 15.7 deg, and the swing angle of the movable mirror 112 in the Z-axis direction of the imaging plate 120 is 20.8 deg. The distance from the optical scanning member 110 to the center O of the imaging region 121 when the optical scanning member 110 is at the reference position, that is, the optical path length is 29 mm.

  According to the present embodiment, since the laser beam is irradiated onto the imaging region 121 from the pentaprism 12 side, it is possible to prevent the laser beam from directly entering the user's eyes. In addition, since the first display device 100 can be assembled and adjusted integrally with the optical system including the pentaprism 12, the eyepiece optical system can be reduced in size and cost.

  Further, since the laser beam does not cross the ridge line 12i, it is not irregularly reflected by the ridge line 12i.

  Next, a fifth display device according to a fifth embodiment will be described with reference to FIG. The same components as those in the first to fourth embodiments are denoted by the same reference numerals and description thereof is omitted.

  A second auxiliary prism 51 is attached to the front reflecting surface 12 d of the pentaprism 12. The second auxiliary prism 51 has a substantially triangular prism shape having a right triangular base and is made of a material having the same density as the pentaprism 12. Of the three rectangular side surfaces of the second auxiliary prism 51, the third side surface 52 in contact with the longest side of the bottom surface is in close contact with the front reflecting surface 12d. The optical scanning member 110 is attached to the fourth side surface 53 that is in contact with the second longest side of the bottom surface.

  The optical scanning member 110 irradiates laser light toward the fourth side surface 53. The laser light passes through the fourth side surface 53, the third side surface 52, and the front reflection surface 12d and enters the pentaprism 12. Then, after being reflected by the first top surface and the second roof surface 12 c, the light passes through the incident surface 12 a and is irradiated onto the imaging plate 120. The positional relationship among the optical scanning member 110, the third side surface 52, the fourth side surface 53, and the prism so that the laser beam is irradiated to the center O of the imaging region 121 when the optical scanning member 110 is at the reference position. Is determined.

  The swing angle of the movable mirror 112 in the X-axis direction of the imaging plate 120 is 16.8 deg, and the swing angle of the movable mirror 112 in the Z-axis direction of the imaging plate 120 is 11.9 deg. The distance from the optical scanning member 110 to the center O of the imaging region 121 when the optical scanning member 110 is at the reference position, that is, the optical path length is 33 mm.

  According to this embodiment, since the laser beam can be irradiated to the imaging plate 120 at a substantially right angle, the aberration of the laser beam irradiated to the imaging plate 120 is reduced, and the shape of the laser beam irradiated to the imaging plate 120 is reduced. Can be easily corrected. Further, since the first display device 100 can be accommodated in front of the pentaprism 12, it is possible to prevent the head of the SLR camera 10 from becoming large.

  Next, a sixth display device according to the sixth embodiment will be described with reference to FIG. The same components as those in the first to fifth embodiments are denoted by the same reference numerals and description thereof is omitted.

  The optical scanning member 110 of the sixth display device is attached to the exit surface 12 e of the pentaprism 12. When the optical scanning member 110 emits laser light, the laser light passes through the emission surface 12e and is irradiated on the front reflection surface 12d. The front reflecting surface 12d reflects the laser beam and irradiates the first top surface and the second roof surface 12c. Then, the laser beam is reflected by the first top surface and the second roof surface 12c, then passes through the incident surface 12a and is irradiated onto the imaging plate 120. When the optical scanning member 110 is at the reference position, the positional relationship between the optical scanning member 110 and the prism is determined so that the laser beam is applied to the center O of the imaging region 121.

  The swing angle of the movable mirror 112 in the X-axis direction of the imaging plate 120 is 11.4 deg, and the swing angle of the movable mirror 112 in the Z-axis direction of the imaging plate 120 is 8.1 deg. The distance from the optical scanning member 110 to the center O of the imaging region 121 when the optical scanning member 110 is at the reference position, that is, the optical path length is 49 mm.

  According to the present embodiment, since the laser beam is irradiated from above the finder optical system 13, the distance from the optical scanning member 110 to the imaging plate 120 is substantially the same as that of the eyepiece optical system. Therefore, the swing range of the movable mirror 112 can be reduced.

  Next, a seventh display device according to the seventh embodiment will be described with reference to FIG. The same components as those in the first to sixth embodiments are denoted by the same reference numerals and description thereof is omitted.

  A third auxiliary prism 71 is attached to the left side surface 12 h of the pentaprism 12. The third auxiliary prism 71 has a substantially triangular prism shape having a bottom surface of a right triangle and is made of a material having the same density as the pentaprism 12. Of the three rectangular side surfaces of the third auxiliary prism 71, the fifth side surface 72 in contact with the longest side of the bottom surface is in close contact with the left side surface 12h. The optical scanning member 110 is attached to the sixth side surface 73 that contacts the second longest side of the bottom surface.

  The optical scanning member 110 irradiates laser light toward the sixth side surface 73. The laser light passes through the sixth side surface 73, the fifth side surface 72, and the left side surface 12h and enters the pentaprism 12. Then, after being reflected by the first roof surface 12 b, the light passes through the incident surface 12 a and is irradiated onto the imaging plate 120. The positional relationship among the optical scanning member 110, the fifth side surface 72, the sixth side surface 73, and the prism so that the laser beam is irradiated onto the center O of the imaging region 121 when the optical scanning member 110 is at the reference position. Is determined. The optical scanning member 110 and the first X direction light detection member 140 are connected by a flexible cable 74.

  According to this embodiment, since the distance between the optical scanning member 110 and the first X-direction light detection member 140 can be shortened, the length of the flexible cable 74 that connects them can be shortened.

  Further, since the first roof surface 12b used for reflecting the subject image is used as the reflecting surface, it is not necessary to newly apply a coating or the like for improving the reflection efficiency.

  Since the laser beam does not cross the ridge line 12i, it is not irregularly reflected by the ridge line 12i.

  Since the laser beam is irradiated onto the imaging region 121 from the pentaprism 12 side, it is possible to prevent the laser beam from directly entering the user's eyes.

  Since the first display device 100 can be assembled and adjusted integrally with the optical system including the pentaprism 12, the eyepiece optical system can be reduced in size and cost. Since the first display device 100 is provided on the left side surface 12h, the height of the digital camera 10 can be suppressed.

  Next, an eighth display device according to an eighth embodiment will be described with reference to FIG. The same components as those in the first to seventh embodiments are denoted by the same reference numerals and description thereof is omitted.

  The optical scanning member 110 of the eighth display device is attached to the bottom surface of the mirror box 15. When the optical scanning member 110 emits laser light, the laser light passes through the mirror box 15 and is irradiated onto the imaging plate 120. When the optical scanning member 110 is at the reference position, the positional relationship between the optical scanning member 110 and the imaging plate 120 is determined so that the laser beam is applied to the center O of the imaging region 121.

  According to the present embodiment, since the laser beam is irradiated from the bottom of the mirror box 15, a long distance from the optical scanning member 110 to the imaging plate 120 can be secured. Therefore, the swing range of the movable mirror 112 can be reduced, and the movable mirror 112 can be reduced in size and cost. Further, since the light does not pass through the optical component, the light quantity loss is eliminated. In addition, since the optical scanning member 110 and the imaging plate 120 are installed separately, the adjustment becomes easy.

  Note that the swinging amplitude of the movable mirror 112 shown in this specification is merely an example, and may be another value.

  The light source of the optical scanning member 110 may be an LED instead of the laser diode light source 111.

  It is sufficient that at least two photodetectors are provided in each axial direction, and the number and arrangement of each embodiment are not limited.

  The resolution of the display device in each embodiment is not limited to 640 dots in the X-axis direction and 480 dots in the Z-axis direction.

12 pentaprism 12a incident surface 12b first roof surface 12c second roof surface 12d front reflecting surface 12e exit surface 12f third surface 12g right side surface 12h left side surface 100 first display device 110 optical scanning member 111 laser diode light source 112 Movable mirror 120 Imaging plate 130 First auxiliary prism 131a First side 131b Second side O Center

Claims (14)

A display device that displays information in a viewfinder of an imaging device,
An imaging plate provided on an optical path from the objective optical system to the eyepiece optical system and having an effective surface through which light that can be visually recognized by the user passes;
An optical scanning member that scans the imaging plate with light;
A light detection member provided outside the effective surface of the imaging plate and capable of receiving light from the light scanning member;
The said optical scanning member is a display apparatus which scans light according to the position of the light which the said light detection member received. The optical scanning member scans light in first and second directions orthogonal to each other;
The display device according to claim 1, wherein the light detection member is provided on each of the imaging plates in directions corresponding to the first direction and the second direction.   The display device according to claim 2, wherein the plurality of light detection members are arranged in a direction corresponding to the first direction or the second direction.   The display device according to claim 2, wherein the plurality of light detection members are arranged at right angles to a direction corresponding to the first direction or the second direction.   The display device according to claim 3, wherein the plurality of light detection members are arranged so as to form a plurality of rows in a direction corresponding to the first direction or the second direction. The imaging plate has a light exit surface from which a subject image incident from the objective optical system exits,
The display device according to claim 1, wherein the light scanning member scans light on the light emitting surface.   A reflecting surface for reflecting a subject image; provided on the light exit surface of the image forming plate between the imaging plate and the eyepiece optical system; and subject image emitted from the light exit surface as the eyepiece The display device according to claim 6, further comprising a reflecting member that leads to the optical system.   The display device according to claim 7, wherein the reflection member is a pentaprism, and the optical scanning member is attached to a front surface surrounded by a roof surface and a third surface of the pentaprism. A reflection member attached to the front surface surrounded by the roof surface and the third surface of the pentaprism;
The display device according to claim 7, wherein the light scanning member scans light toward the reflecting member.   The display device according to claim 7, wherein the optical scanning member is attached to a third surface of the pentaprism.   The display device according to claim 7, wherein the optical scanning member is attached to a surface of the pentaprism to which the eyepiece optical system is attached. The pentaprism has a side surface parallel to the optical path through which the subject image passes,
The reflective surface is a roof surface of the pentaprism,
The display device according to claim 7, wherein the optical scanning member is provided on the side surface and irradiates light toward the roof surface.   The display device according to claim 6, wherein the reflecting member is a pentamirror. The imaging plate has a light incident surface on which a subject image is incident from the objective optical system,
The display device according to claim 1, wherein the light scanning member scans light on the light incident surface.

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