JP2019129455A - Optical device - Google Patents

Abstract

An optical device capable of preventing a user from feeling uncomfortable is provided. An optical device moves between an imaging unit that captures an image by a light beam from an optical system and outputs an image signal, and a first position that enters the light beam and a second position that retreats from the light beam. an optical member that transmits at least part of the light beam when entering the light beam; and the first position and the second position while the optical member is moving between the first position and the second position. position, the amplification factor of the first image signal outputted by picking up the image by the first light flux passing through the optical member among the image signals outputted from the imaging unit is set to the above and a control unit that captures an image of the second light beam that does not pass through the optical member and increases the amplification factor of the output second image signal. [Selection drawing] Fig. 1

Description

  The present invention relates to an optical device.

  There is known a camera capable of switching between a function of observing an optical subject image and a function of displaying a subject image captured by an imaging device (Japanese Patent Application Laid-Open No. 2008-101501). In this camera, no consideration is given to the subject image captured during the switching of the function.

International Publication No. 2014/002657

According to the first aspect of the present invention, the optical device includes an imaging unit that captures an image of a light beam from the optical system and outputs an image signal, a first position that has entered the light beam, and a second that is retracted from the light beam. An optical member that is movable between positions and transmits at least a part of the light beam when entering the light beam, and the optical member moves between the first position and the second position. A first image signal obtained by capturing an image of a first light beam passing through the optical member among the image signals output from the imaging unit when being located between the first position and the second position; A control unit that increases the amplification factor of the second image signal output by capturing an image of the second light flux that does not pass through the optical member.
According to the second aspect of the present invention, the optical device includes an imaging unit that captures an image of a light beam from the optical system and outputs an image signal, a first position that has entered the light beam, and a second that is retracted from the light beam. The optical member includes an optical member that is movable between positions and transmits at least a part of the luminous flux when entering the luminous flux, and an image generation unit that generates an image based on the image signal, and the imaging unit includes the optical A first region for receiving a first light flux transmitted through the optical member and incident on the imaging unit in the light flux in a state where the member is positioned between the first position and the second position; The image generation unit outputs the image signal based on the image of the light beam received by the second region that receives the second light beam incident on the imaging unit without passing through the member, and the image generation unit receives the light at the first region. The brightness of the image signal based on the image of the reflected light flux Generating the image.
According to the third aspect of the present invention, the optical device captures an image by the light flux from the optical system and outputs an image signal, and the display unit displays the image based on the image signal output from the imaging unit. A control unit that controls an image to be transmitted; a first position that is inserted into an optical path between the optical system and the imaging unit and transmits at least part of a light beam from the optical system; and a second position that is retracted from the optical path And the imaging unit transmits the optical member of the light flux in a state where the optical member is positioned between the first position and the second position. Based on the image of the light beam received by the first region that receives the first light beam incident on the imaging unit and the second region that receives the second light beam incident on the imaging unit without passing through the optical member. And outputting the image signal, and the control unit in the first area. Varying the amplification factor of the image signal output being imaged and the amplification factor of the image has been outputted the image signal in the second region.

It is a schematic diagram which shows the structural example of the imaging device which concerns on 1st Embodiment. It is a schematic diagram which shows the structural example of the imaging device which concerns on 1st Embodiment. FIG. 7 is a schematic view for explaining an operation example of the imaging device according to the first embodiment. It is a schematic diagram which shows the image observed with the observation optical system of the imaging device which concerns on 1st Embodiment.

First Embodiment
FIG. 1 is a view showing a configuration example of an electronic camera 1 (hereinafter referred to as a camera 1) which is an example of an imaging device to which the optical device according to the first embodiment is applied. The camera 1 includes a camera body 2 and a lens unit 3. The lens unit 3 is, for example, an interchangeable lens barrel, and is detachably attached to the camera body 2 via a mount unit (not shown). The camera 1 according to the present embodiment includes an optical viewfinder (OVF) function that displays a subject image (optical image) by the lens unit 3 and an electronic device that displays an image obtained by capturing the subject image. And a viewfinder (EVF: Electronic View Finder) function. The camera 1 may be a camera in which the camera body 2 and the lens unit 3 are integrally formed.

  The lens unit 3 includes a photographing optical system (imaging optical system) 31. The photographing optical system 31 is illustrated as a single lens to simplify the drawing, but includes a plurality of lenses including a focusing lens (focus lens) and an aperture, and the imaging of the imaging element of the camera body 2 is performed. A subject image is formed on the surface. The focus adjustment lens of the photographic optical system 31 moves back and forth in the direction of the optical axis L1 based on a signal (including a drive instruction and a drive amount) output from the control unit of the camera body 2. The aperture diameter of the stop of the photographic optical system 31 is controlled based on a signal output from the control unit of the camera body 2.

  The camera body 2 includes a main mirror 21, a sub mirror 22, a light shielding unit 30, an observation optical system 40, an autofocus (AF) sensor 23, an image sensor 24, a control unit 25, a memory 26, and a display. A unit 27 and an operation unit 28 are provided.

  The main mirror 21 is configured by a beam splitter, and is disposed between the photographing optical system 31 and the image sensor 24, and subject light is incident through the photographing optical system 31. The beam splitter is, for example, a thin film mirror (pellicle mirror) on which a dielectric multilayer film is deposited. The main mirror 21 may be flat glass on which the multilayer film is formed. The main mirror 21 enters the optical path of light from the subject and is disposed obliquely with respect to the optical axis L1 (mirror down position shown in FIG. 1) and a position retracted from the optical path (mirror shown in FIG. 2). Up position). That is, the main mirror 21 has a function as a so-called quick return mirror.

  The sub mirror 22 is disposed between the main mirror 21 and the image sensor 24 and reflects part of the light transmitted through the main mirror 21 toward the AF sensor 23. When the main mirror 21 is moved to the mirror up position, the sub mirror 22 is moved to a position retracted from the optical path of the light from the subject in conjunction with the main mirror 21.

  The light shielding portion (light shielding plate) 30 is formed of a member that shields light, and when the main mirror 21 is at the mirror down position, a position retracted from the optical path of light from the subject, for example, as shown in FIG. It is disposed at a position parallel to the optical axis L1. When the main mirror 21 is moved to the mirror up position, the light shielding unit 30 moves in conjunction with the main mirror 21 while maintaining the parallel state to the optical axis L1, and as shown in FIG. It is arranged so as to cover. Thereby, the light shielding unit 30 prevents light from the subject from entering the observation optical system 40. Further, the light shielding unit 30 prevents back-incident light from the viewfinder eyepiece from entering the subject optical path (in the mirror box, corresponding to the dotted line 52 in FIG. 3E).

  The AF sensor 23 is composed of, for example, a line sensor or the like, and photoelectrically converts light from the subject reflected by the sub mirror 22 to generate a pair of focus detection signals used for phase difference type focus detection. The AF sensor 23 outputs the generated pair of focus detection signals (first focus detection signal and second focus detection signal) to the control unit 25. The first and second focus detection signals photoelectrically convert the first and second images of the first and second light beams that have passed through the first and second regions of the exit pupil of the photographing optical system 31, respectively. Generated.

  The image sensor 24 is, for example, a CMOS image sensor or a CCD image sensor. The image sensor 24 receives the light flux that has passed through the photographing optical system 31 and picks up a subject image. In the imaging device 24, a plurality of pixels having photoelectric conversion units are arranged in the row direction and the column direction. The photoelectric conversion unit is configured of, for example, a photodiode (PD). The image sensor 24 photoelectrically converts the received light to generate a signal (image signal), and outputs the generated image signal to the control unit 25.

  The memory 26 is, for example, a recording medium such as a memory card. An image signal or the like is recorded in the memory 26. Writing of data to the memory 26 and reading of data from the memory 26 are performed by the control unit 25. The display unit 27 displays an image based on an image signal, an image indicating a focus detection area (AF area) such as an AF frame, information relating to shooting such as a shutter speed and an aperture value, a menu screen, and the like. The operation unit 28 includes various setting switches such as a release button, a power switch, and a switch for switching various modes, and outputs an operation signal corresponding to each operation to the control unit 25.

  The control unit 25 includes a processor such as a CPU or FPGA (Field Programmable Gate Array), and a memory such as a ROM or a RAM, and controls each unit of the camera 1 based on a control program. The control unit 25 performs various types of image processing on the image signal output from the imaging device 24. The control unit 25 causes the memory 26 to record the processed image signal (image signal for still image or image signal for moving image). The image processing includes, for example, known image processing such as color interpolation processing and contour enhancement processing.

  The control unit 25 calculates a defocus amount by a known phase difference method using a pair of focus detection signals output from the AF sensor 23. Specifically, the control unit 25 detects the image shift amounts of the first and second images based on the pair of focus detection signals. The control unit 25 calculates the defocus amount based on the detected image shift amount. Focusing is performed by driving the focusing lens in accordance with the defocus amount.

  When the main mirror 21 described above is disposed at the down position shown in FIG. 1, a part of the light beam that has passed through the photographing optical system 31 is reflected upward (upward in the drawing) by the main mirror 21, and the photographing optical system 31. The other part of the light beam that has passed through passes through the main mirror 21. The luminous flux reflected by the main mirror 21 is guided to the observation optical system 40. A part of the light beam transmitted through the main mirror 21 is reflected downward (downward in the drawing) by the sub mirror 22 and guided to the AF sensor 23. That is, when the main mirror 21 is located at the down position, the subject light is guided to each of the observation optical system 40 and the AF sensor 23. Thus, the user can observe the subject image through the observation optical system 40, and the AF sensor 23 can perform focus detection.

  The observation optical system 40 includes a focusing screen 41, a filter unit 48, a pentaprism 42, a beam splitter 43, an image display unit 44, an EVF lens 45, an eyepiece lens 46, and an eyepiece unit 47. As described above, when the main mirror 21 is located at the down position, the subject light reflected by the main mirror 21 enters the observation optical system 40.

  The focusing plate 41 is disposed at a position optically equivalent to the imaging device 24, and a light beam reflected by the main mirror 21 forms a subject image. That is, an object image by the light flux that has passed through the photographing optical system 31 is formed on the focusing screen 41 via the main mirror 21.

  The filter unit 48 is made of a liquid crystal material or the like that can be changed to a transmission state or a light shielding state, and is disposed between the focusing screen 41 and the pentaprism 42. The control unit 25 controls the filter unit 48 in the transmission state or the light blocking state by supplying and stopping the electric signal to the filter unit 48. The filter unit 48 is also a light shielding unit that shields the light path of the observation optical system 40.

  When the main mirror 21 is in the down position, the filter unit 48 is controlled to be in a transmission state in which light is transmitted. When the main mirror 21 is positioned at the up position, the filter unit 48 is controlled to be in a light blocking state in which light is blocked. As will be described later, the control unit 25 switches the filter unit 48 from the transmission state to the light shielding state while the main mirror 21 moves from the down position to the up position. The pentaprism 42 has a plurality of reflection surfaces, and reflects and inverts (converts) the subject image formed on the focusing screen 41 into an erect image when the filter unit 48 is in the transmission state.

  The image display unit 44 is, for example, a liquid crystal display device having a liquid crystal panel and a light source. The liquid crystal panel is composed of a plurality of pixels (liquid crystal pixels) arranged in the row direction and the column direction. The liquid crystal panel includes, for example, three types of pixels having R (red), G (green), and B (blue) color filters. The light source of the liquid crystal display device includes a plurality of LEDs (Light Emitting Diodes) and the like, and functions as a backlight of the liquid crystal panel. Light from the light source of the image display unit 44 passes through the color filters of the RGB pixels and is guided to the eyepiece 46 through the EVF lens 45 and the beam splitter 43.

  The image display unit 44 displays an image by controlling transmission of light from the light source using pixels of each color of RGB. The image display unit 44 functions as part of an electronic viewfinder (EVF). The image display unit 44 displays an image based on an image signal from the image sensor 24, an image showing an AF frame, information related to photographing such as an aperture value, and the like. The image display unit 44 may be a display device using an organic EL.

  The beam splitter 43 has, for example, a surface on which a dielectric multilayer film is deposited. The beam splitter 43 is disposed on the optical path of the subject light that passes through the pentaprism 42, and the light beam that has passed through the pentaprism 42 is incident on the beam splitter 43. Part of the light beam that has passed through the pentaprism 42 passes through the beam splitter 43 and is guided to the eyepiece 46. Further, the light beam emitted from the image display unit 44 enters the beam splitter 43. A part of the light beam emitted from the image display unit 44 is reflected by the beam splitter 43 and guided to the eyepiece 46. The beam splitter 43 may be a thin film mirror on which a dielectric multilayer film is deposited.

  When the main mirror 21 is at the down position, light from the subject is guided to the observation optical system 40, passes through the beam splitter 43, and is incident on the eyepiece lens 46. Accordingly, the user can observe a subject image (hereinafter also referred to as an optical image) through the eyepiece 47 and the eyepiece 46. When a mode for displaying an optical image (OVF mode) is selected by the user operating the operation unit 28 or the like, the control unit 25 moves the main mirror 21 to the down position and observes the optical image with the observation optical system 40. Make it possible.

  Note that an image indicating the AF frame, the aperture value, and the like may be displayed on the image display unit 44 in a state where the optical image can be observed. In this case, the light from the subject passing through the beam splitter 43 and the light emitted from the image display unit 44 and reflected by the beam splitter 43 are superimposed (combined) and guided to the eyepiece 46. Thus, the user can observe an image such as an AF frame displayed by the image display unit 44 and the optical image through the eyepiece unit 47 and the eyepiece lens 46.

  Further, when switching from the OVF mode to a mode (EVF mode) for displaying an image by an image signal (hereinafter also referred to as an EVF image), the control unit 25 moves the main mirror 21 from the down position to the up position. Do. Then, the control unit 25 causes the image sensor 24 to capture a subject image, and performs image processing on the image signal output from the image sensor 24. In addition, the control unit 25 displays an image (EVF image) based on the image signal on the image display unit 44 of the observation optical system 40. For example, the control unit 25 performs processing for displaying a through image (live view image) of the subject on the image display unit 44 in real time as an EVF image. Light emitted from the image display unit 44 and reflected by the beam splitter 43 is guided to the eyepiece 46. Accordingly, the user can observe the EVF image displayed by the image display unit 44 via the eyepiece unit 47 and the eyepiece lens 46.

  As described above, when switching from the OVF mode to the EVF mode is instructed by operating the operation unit 28 or the like, the control unit 25 performs control to move the main mirror 21 from the down position to the up position. When the angle of the main mirror 21 with respect to the optical axis L1 of the imaging optical system 31 changes as the main mirror 21 moves, the optical image shifts in the observation optical system 40 due to a change in the reflection direction by the main mirror 21 and the like. Loss. This deviation or loss of the optical image occurs when the angle of the main mirror 21 with respect to the optical axis L1 of the photographing optical system 31 is a predetermined angle or more. That is, when the main mirror 21 moves from the down position and reaches a position (reference position) at the predetermined angle, the optical image is shifted or lost. Note that the reference position at which such loss of the optical image occurs varies depending on the optical characteristics of the main mirror 21.

  Therefore, in the present embodiment, when the main mirror 21 reaches the reference position between the down position and the up position, the control unit 25 switches the filter unit 48 from the transmission state to the light shielding state, and the image display unit 44 performs EVF. Start displaying the image. For this reason, it is possible to prevent a state in which neither an optical image nor an EVF image can be observed in the eyepiece 47 (also referred to as blackout). As a result, it is possible to prevent the user from feeling uncomfortable when switching between the OVF mode and the EVF mode.

  The main mirror 21 also moves toward the up position even after passing the reference position. When the main mirror 21 moves between the reference position and the up position, a part of the light beam that has passed through the photographic optical system 31 is guided to the image sensor 24 via the main mirror 21, and the light beam that has passed through the photographic optical system 31. The other part is directly guided to the imaging device 24 without passing through the main mirror 21.

  The luminous flux (first luminous flux) transmitted through the main mirror 21 as compared with the area (second area) of the imaging element 24 that receives the luminous flux (second luminous flux) that enters the imaging element 24 without transmitting through the main mirror 21 In the region (first region) of the image sensor 24 that receives light, the amount of light received from the subject decreases. For this reason, the signal level of the image signal generated by the pixels in the first region is lower than the signal level of the image signal generated by the pixels in the second region. If signal processing is performed with the same amplification factor (gain) on image signals from pixels in the first region and the second region, uneven brightness occurs in the EVF image based on the processed image signal. That is, even when the same subject is imaged by the pixels of the first and second areas, an image area by the image signal of the pixel of the first area and an image area by the image signal of the pixels of the second area in the EVF image This causes a difference in brightness and the like, which gives the user a sense of discomfort.

  Therefore, in the present embodiment, the control unit 25 makes the amplification factor of the image signal by the pixels in the first region larger than the amplification factor of the image signal by the pixels in the second region. As a result, it is possible to prevent the occurrence of uneven brightness in the EVF image observed through the observation optical system 40, and it is possible to suppress the user from feeling discomfort. This will be described below with reference to FIGS.

  FIG. 3 is a schematic view for explaining an operation example of the camera 1 according to the first embodiment. In the example shown in FIG. 3, only the lens unit 3 having the photographing optical system 31, the main mirror 21, and the imaging element 24 are illustrated in order to simplify the description. FIG. 4 is a schematic view showing an image observed by the observation optical system 40 of the camera 1 according to the first embodiment.

  FIGS. 3A to 3E show the process of moving the main mirror 21 from the down position to the up position in time series. FIG. 3A shows a case where the main mirror 21 is located at the down position, and FIG. 3B shows a case where the main mirror 21 is located at the reference position. FIGS. 3C and 3D show a case where the main mirror 21 is located between the reference position and the up position, and FIG. 3E shows a case where the main mirror 21 is located at the up position. Yes.

  In FIG. 3, a dotted line 51 schematically represents a first light beam that passes through the main mirror 21 and enters the image sensor 24. A dotted line 52 schematically represents the second light flux that enters the imaging element 24 without passing through the main mirror 21, that is, without passing through (passing through) the main mirror 21. A dotted line 53 schematically represents a light beam (third light beam) reflected by the main mirror 21 and guided to the observation optical system 40. In the image sensor 24, the first region 61 is a region where the second light beam 52 is not incident, and the second region 62 is a region where the second light beam 52 is incident. As shown in FIGS. 3A to 3E, the range of the first region 61 and the second region 62 in the image sensor 24 as the main mirror 21 moves toward the up position is as follows. Change. FIGS. 4A to 4E schematically show images visually recognized by the image display unit 44 or the eyepiece unit 47 in FIGS. 3A to 3E, respectively.

  As shown in FIG. 3A, when the main mirror 21 is located at the down position, the first light beam 51 transmitted through the main mirror 21 out of the light beam guided to the main mirror 21 through the photographing optical system 31 is an image sensor. 24 is incident. In this case, the entire area of the imaging device 24 is the first area 61 where the first light beam 51 is incident. On the other hand, the third light flux 53 reflected by the main mirror 21 among the light flux guided to the main mirror 21 via the photographing optical system 31 is guided to the observation optical system 40. In addition, when the main mirror 21 is at the down position, the filter unit 48 of the observation optical system 40 is controlled to be in a transmission state in which light is transmitted. Therefore, as shown in FIG. 4A, the optical image by the third light flux 53 can be observed through the observation optical system 40. Further, in the state of FIG. 4A, when switching from the OVF mode to the EVF mode is instructed by the user operating the operation unit 28, the main mirror 21 starts moving from the down position to the up position.

  As shown in FIG. 3B, when the main mirror 21 is located at the reference position, the first light beam 51 that passes through the main mirror 21 is incident on the image sensor 24. Each pixel of the first region 61 where the first light beam 51 is incident captures an image of the first light beam 51 and generates a first image signal. The imaging element 24 outputs the generated first image signal to the control unit 25. The control unit 25 performs image processing for amplifying the first image signal so that the luminance (brightness) of the image based on the first image signal is the same as that of the optical image in FIG. More specifically, the control unit 25 determines a first amplification factor (gain) G1 in accordance with the luminance of the optical image, and performs a process of multiplying the first image signal by the first gain G1.

  Further, as the main mirror 21 moves to the reference position, the angle of the main mirror 21 with respect to the optical axis L1 of the photographing optical system 31 changes, and the reflection direction of the third light flux 53 on the main mirror 21 changes. As a result, loss of the optical image occurs. Therefore, when the main mirror 21 moves to the reference position, the control unit 25 switches the filter unit 48 from the transmission state to the light shielding state, and starts displaying the EVF image by the image display unit 44 as shown in FIG. 4B. Let At this time, the EVF image displayed by the image display unit 44 is constituted by the first image area 71 based on the first image signal amplified by the first gain G1.

  As shown in FIG. 3C, when the main mirror 21 is located between the reference position and the up position, a part of the light beam that has passed through the photographing optical system 31 is guided to the main mirror 21, and the photographing optical system 31 is moved. The other part of the light flux that has passed is guided to the imaging device 24 without passing through the main mirror 21. Therefore, the first light flux 51 transmitted through the main mirror 21 and the second light flux 52 not transmitted through the main mirror 21 enter the imaging device 24.

  In the case of FIG. 3C, the first light beam 51 is incident on the first region 61 of the image sensor 24, and the second light beam 52 is incident on the second region 62 of the image sensor 24. Each pixel of the first area 61 captures an image of the first luminous flux 51 to generate a first image signal. Each pixel of the second area 62 captures an image of the second luminous flux 52 to generate a second image signal. The imaging device 24 outputs the generated first and second image signals to the control unit 25.

  As described above, the signal level of the first image signal is lower than the signal level of the second image signal. When performing image processing using the first and second image signals, the control unit 25 sets the gain used for the signal processing of the first image signal to be larger than the gain used for the signal processing of the second image signal. To do. For example, the control unit 25 performs processing of multiplying the first image signal by the first gain G1 and processing of multiplying the second image signal by the second gain G2 smaller than the first gain G1. Then, the control unit 25 changes (updates) the EVF image displayed by the image display unit 44 or the display unit 27 based on the processed first and second image signals. The EVF image displayed by the image display unit 44 is composed of a first image area 71 based on the first image signal and a second image area 72 based on the second image signal as shown in FIG. 4C. Composed.

  Note that the control unit 25 determines the second gain G2 so that the luminances of the first image region 71 and the second image region 72 are equal. Specifically, for example, the control unit 25 determines the second gain G2 based on the first gain G1 and the transmittance of the main mirror 21. Further, for example, the second gain G2 is determined so as to reduce a sense of discomfort at the boundary between the first image region 71 and the second image region 72.

  When the main mirror 21 further moves to the state of FIG. 3D, the range (size) of the first region 61 and the second region 62 in the image sensor 24 changes compared to the case of FIG. To do. The first region 61 in the case of FIG. 3D is smaller (narrower) than the first region 61 in the case of FIG. 3C, and the second region 62 in the case of FIG. In the case of d), the second region 62 becomes larger (wider). In the case of FIG. 3D as well, as in the case of FIG. 3C, the first light beam 51 is incident on the first region 61 of the image sensor 24, and the second region 62 of the image sensor 24 is the second region 62. Beam 52 enters.

  The control unit 25 performs signal processing on the first and second image signals output from the imaging device 24 with first and second gains G1 and G2, respectively. Then, as shown in FIG. 4D, the control unit 25 causes the image display unit 44 to display an EVF image based on the processed first and second image signals. In the EVF image of FIG. 4D, the first image area 72 is smaller and the second image area 71 is larger than in the case of FIG. 4C.

  When the main mirror 21 is moved to the up position as shown in FIG. 3E, the light flux that has passed through the photographing optical system 31 is incident on the imaging device 24. In this case, the entire area of the image sensor 24 becomes the second area 62 where the second light flux 52 that does not pass through the main mirror 21 is incident, and each of the pixels provided in the image sensor 24 generates a second image signal. To the control unit 25. The control unit 25 performs signal processing on the second image signal from the imaging device 24 with a second gain G2. Then, as shown in FIG. 4E, the control unit 25 causes the image display unit 44 to display an EVF image based on the processed second image signal.

According to the embodiment described above, the following operational effects can be obtained.
(1) The optical device captures an image of a light beam from the optical system (shooting optical system 31) and outputs an image signal, and retracts from the first position and light beam entering the light beam. An optical member (main mirror 21) that is movable between the second position and transmits at least a part of the light flux when entering the light flux, and the optical member is on the way between the first position and the second position Among the image signals output from the imaging unit, the amplification factor of the first image signal output by capturing an image of the first light flux passing through the optical member when the image pickup unit is positioned between the first position and the second position And a control unit 25 for making the gain larger than the amplification factor of the second image signal output by taking an image of the second light flux that does not pass through the optical member. Since it did in this way, the brightness | luminance nonuniformity of the image by a 1st image signal and a 2nd image signal can be reduced, and an image quality can be improved. In addition, it is possible to suppress giving a sense of incongruity to the user.
(2) The optical device includes a display unit (image display unit 44) that displays an image based on an image signal. When the optical member moves to a position having a first angle with respect to the optical axis of the optical system, the control unit 25 starts displaying an image on the display unit. Since it did in this way, it can prevent that blackout arises and can suppress giving a discomfort to a user.

  The following modifications are also within the scope of the present invention, and one or more of the modifications can be combined with the above-described embodiment.

(Modification 1)
In the embodiment described above, when the control unit 25 performs display on the display unit based on the amplification factor when performing signal processing on the first and second image signals output from the imaging device 24, that is, the image signal. An example has been described in which the amplification factor of the image signal is different between the first and second image signals. However, the control unit 25 controls the image sensor 24 to perform signal processing of the first image signal and the second image signal in the image sensor 24, that is, an image signal before output from the image sensor. The amplification factor may be different between the first image signal and the second image signal.

(Modification 2)
In the embodiment described above, an example has been described in which switching from an optical image to an EVF image is performed when switching from the OVF mode to the EVF mode is instructed and the main mirror 21 reaches the reference position. However, when switching from the OVF mode to the EVF mode is instructed, the display may be switched from the optical image to the EVF image immediately.

(Modification 3)
The optical device described in the above embodiment may be applied to a range finder, a telescope, and binoculars.

  The present invention is not limited to the above contents. Other embodiments considered within the scope of the technical idea of the present invention are also included within the scope of the present invention.

Reference Signs List 1 imaging apparatus, 21 main mirror, 24 imaging elements, 25 control unit, 31 imaging optical system, 44 image display unit

Claims (11)

An imaging unit that captures an image of a light beam from the optical system and outputs an image signal;
An optical member that is movable between a first position entering the light beam and a second position retracted from the light beam, and transmits at least part of the light beam when entering the light beam;
When the optical member is positioned between the first position and the second position while moving between the first position and the second position, of the image signals output from the imaging unit, The amplification factor of the first image signal output by capturing an image of the first light flux that passes through the optical member, and the second image output by capturing an image of the second light flux that does not pass through the optical member. A control unit for making the gain larger than the signal amplification rate;
An optical device comprising: The optical device according to claim 1.
A display unit for displaying an image based on the image signal;
The said control part is an optical apparatus which makes the gain of the said 1st image signal which displays an image on the said display part larger than the gain of the said 2nd image signal. The optical device according to claim 1 or 2,
The imaging unit outputs a plurality of the image signals at different times when the optical member moves from the first position to the second position,
The control unit may make an amplification factor of the first image signal different for each of the plurality of image signals. The optical device according to any one of claims 1 to 3,
The said control part is an optical apparatus which changes the signal level of the said image signal by the said light beam which has a uniform brightness | luminance with a said 1st image signal and a said 2nd image signal. In the optical device according to any one of claims 1 to 4,
A display unit for displaying an image based on the image signal;
The control unit is an optical device that starts displaying an image on the display unit when the optical member moves to a position at a first angle with respect to an optical axis of the optical system. The optical device according to claim 5.
When the optical member is moved to a position where the first angle is set, an imaging unit that captures an image of the first light flux and an image of the second light flux and outputs the image signal is provided.
The control unit displays an image by the first light flux in the image by the display unit as an image of a first area on the display unit, and the image by the second light flux as the image of a second area. An optical device for displaying on a display unit. The optical device according to any one of claims 1 to 6,
An observation optical system for observing an image by a light beam reflected from the optical member;
An optical apparatus further comprising: a light shielding unit that shields an optical path of the observation optical system after the optical member starts moving from the first position to the second position. The optical device according to any one of claims 1 to 7,
The optical device, wherein the optical member is a thin film mirror. An imaging unit that captures an image of a light beam from the optical system and outputs an image signal;
An optical member that is movable between a first position entering the light beam and a second position retracted from the light beam, and transmits at least part of the light beam when entering the light beam;
An image generation unit that generates an image based on the image signal;
The imaging unit receives the first light flux transmitted through the optical member of the light flux and entering the imaging unit in a state where the optical member is positioned between the first position and the second position. Outputting the image signal based on the image of the light beam received in the first region and the second region that receives the second light beam incident on the imaging unit without passing through the optical member;
The image generation unit is an optical device that generates the image by increasing the luminance of an image signal based on an image of a light beam received in the first region. An imaging unit that captures an image by a light flux from an optical system and outputs an image signal;
A control unit that controls an image to be displayed on a display unit based on the image signal output from the imaging unit;
An optical member that is inserted in an optical path between the optical system and the imaging unit and moves between a first position that transmits at least part of a light beam from the optical system and a second position that is retracted from the optical path;
Have
The imaging unit receives the first light flux transmitted through the optical member of the light flux and entering the imaging unit in a state where the optical member is positioned between the first position and the second position. The image signal is output based on an image of a light beam received by the first region and a second region that receives the second light beam incident on the imaging unit without transmitting the optical member.
The control unit is configured to make the amplification factor of the image signal imaged and output in the first area different from the amplification factor of the image signal imaged and output in the second area. The optical device according to claim 10.
The control unit is an optical device that makes the amplification factor of the image signal in the first region larger than the amplification factor of the image signal in the second region.

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