JP2017207524A - Optical observation device and binoculars - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical observation device and binoculars that enable recording of an optical image of a subject, and are short in an overall length.SOLUTION: A first optical system 10L of a binoculars 10 comprises: an objective lens 12; an erect prism 13; a movable mirror 15; an eyepiece lens 16; and an image pick-up element 18. The erect prism 13 is configured to emit, from an emission surface 14B, an optical image incident upon an incidence surface 14A from the objective lens 12 with the optical image erected. Further, the erect prism 13 has a non-total reflection surface 14C in an optical path from the incidence surface 14A to the emission surface 14B. The movable mirror 15 is configured to move between a first position opposing the non-total reflection surface 14C and a second position non-opposing the non-total reflection surface 14C. When the movable mirror 15 is present at the first position, the erected optical image is made incident upon the eyepiece lens 16. When the movable mirror 15 is present in the second position, the image pick-up element 18 is configured to photograph the optical image.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an optical observation apparatus and binoculars that can record an optical image of a subject.

  Some optical observation apparatuses such as binoculars are provided with an image sensor in order to record an optical image (observation image) of a subject. In order to guide the optical image incident from the objective lens to the imaging device, there is a configuration in which a half mirror is arranged in the optical path, and the optical path of the optical image is branched and guided to the eyepiece and the imaging device.

  However, if the half mirror is fixed on the optical path in this way, the amount of light at the time of observation decreases.Therefore, the movable mirror is arranged on the optical path and the movable mirror is driven so that only the optical image of the subject is recorded. A configuration for guiding an optical image to an image sensor has been proposed (Patent Documents 1 and 2). Optical observation apparatuses such as binoculars are provided with an erecting prism for erecting an optical image. In Patent Documents 1 and 2, a movable mirror is disposed between the erecting prism and the eyepiece.

Japanese Patent Laid-Open No. 11-218692 Japanese Patent Laid-Open No. 2004-070330

  However, as described in Patent Documents 1 and 2, in order to arrange the movable mirror between the erecting prism and the eyepiece, there is a space for arranging the movable mirror between the erecting prism and the eyepiece. Since it is necessary, there is a problem that the optical path is long and the entire length of the optical observation apparatus is long.

  An object of the present invention is to provide an optical observation apparatus and binoculars that can record an optical image of a subject and have a short overall length.

  The optical observation apparatus of the present invention includes an objective lens, an erecting prism, a movable mirror, an eyepiece lens, and an image sensor. The erecting prism erects the light image incident on the incident surface from the objective lens and emits it from the exit surface. The erecting prism has a non-total reflection surface in the optical path from the entrance surface to the exit surface. The movable mirror moves between a first position facing the non-total reflection surface and a second position not facing the non-total reflection surface. When the movable mirror is in the first position, the ocular lens reflects the light image incident on the non-total reflection surface through the optical path, and the upright light image emitted from the exit surface is incident. Is done. When the movable mirror is at the second position, the imaging element captures a light image that is incident on the non-total reflection surface from the optical path and passes without being reflected by the non-total reflection surface.

  The movable mirror disposed at the first position is preferably in contact with the non-total reflection surface or in non-contact with the non-total reflection surface via a gap.

  The erecting prism is preferably composed of a roof prism and an auxiliary prism combined in a Schmidt-Pechan type, and the auxiliary prism preferably has a non-total reflection surface. In this case, when the movable mirror is in the first position, the light image reflected by the movable mirror is preferably incident on the roof prism.

  It is preferable to include a control unit that controls the movement of the movable mirror and the imaging operation of the imaging device, and the control unit causes the imaging device to perform an imaging operation in a state where the movable mirror is moved to the second position. In addition, the movable mirror reflects the light image that has passed without being reflected by the non-total reflection surface in the state where the movable mirror is disposed at the second position, and the imaging element is reflected by the movable mirror disposed at the second position. It is preferable to capture a light image.

  The present invention relates to binoculars having a first optical system and a second optical system, and in at least one of the first optical system and the second optical system, an objective lens, an erecting prism, a movable mirror, an eyepiece lens, An image sensor. The erecting prism erects the light image incident on the incident surface from the objective lens and emits it from the exit surface. The erecting prism has a non-total reflection surface in the optical path from the entrance surface to the exit surface. The movable mirror moves between a first position facing the non-total reflection surface and a second position not facing the non-total reflection surface. When the movable mirror is in the first position, the ocular lens reflects the light image incident on the non-total reflection surface through the optical path, and the upright light image emitted from the exit surface is incident. Is done. When the movable mirror is at the second position, the imaging element captures a light image that is incident on the non-total reflection surface from the optical path and passes without being reflected by the non-total reflection surface.

  According to the present invention, the optical path is switched by providing the movable mirror that moves between the first position facing the non-total reflection surface of the erecting prism and the second position not facing the non-total reflection surface. Since the optical image is guided to the image sensor, the optical image can be recorded, and an optical observation apparatus and binoculars with a short overall length can be provided.

It is an external perspective view of binoculars. It is a figure which shows the structure of a 1st optical system. It is a figure which shows the structure of a 2nd optical system. It is a figure which shows the structure of the binoculars of 2nd Embodiment. It is a figure which shows the structure of the 1st optical system of 3rd Embodiment. It is a top view of the mirror surface side of the movable mirror of 3rd Embodiment. It is a figure which shows the structure of the 1st optical system of 4th Embodiment. It is a top view of the mirror surface side of the movable mirror of 4th Embodiment. It is a top view by the side of the non-total reflection surface of the auxiliary prism of 4th Embodiment. It is a figure which shows the structure of the 1st optical system of 5th Embodiment. It is a figure explaining the position of a stopper member.

[First Embodiment]
In FIG. 1, a binocular 10 includes a first optical system 10L and a second optical system 10R. The first optical system 10L erects an optical image incident from the subject along the optical axis AL and guides it to the first eyepiece EL where the left eye of the observer is in contact. The second optical system 10R erects a light image incident along the optical axis AR from the subject and guides the light image to the second eyepiece ER where the right eye of the observer is eyepiece.

  The binoculars 10 are provided with a power switch 10A for turning on / off the power and a shutter button 10B for recording a light image of the subject. The observer can observe an upright light image of the subject. When the observer presses the shutter button 10B during the observation mode, the observer switches to the photographing mode, and the light image of the subject is recorded.

  In FIG. 2, the first optical system 10 </ b> L includes an objective lens 12, an erecting prism 13, a movable mirror 15, an eyepiece lens 16, and an image sensor 18. The objective lens 12 is composed of a plurality of optical lenses. By moving a whole or a part of these optical lenses by a mechanism (not shown), the optical image is focused (focused) or the optical image is enlarged. The magnification can be changed (zooming).

  The erecting prism 13 includes a roof prism 13B and an auxiliary prism 13A combined in a Schmidt-Pechan type. The auxiliary prism 13A has an incident surface 14A on which the light image of the subject from the objective lens 12 enters. The roof prism 13B has an exit surface 14B that emits an optical image of an upright subject. The entrance surface 14A and the exit surface 14B are substantially orthogonal to the optical axis AL.

  In the optical path of the optical image between the incident surface 14A and the exit surface 14B of the erecting prism 13, there is a non-total reflection surface 14C that does not totally reflect because the incident angle of the optical image is smaller than the critical angle. The critical angle is a value determined by Snell's law. The non-total reflection surface 14C is one surface of the auxiliary prism 13A. The light image that has entered the erecting prism 13 undergoes total reflection on surfaces other than the non-total reflection surface 14 </ b> C in the erecting prism 13.

  In a general auxiliary prism, a reflection film for reflecting a light image of a subject is formed on the non-total reflection surface. However, the reflection film is not formed on the non-total reflection surface 14C of the auxiliary prism 13A of this embodiment. Not formed. For this reason, the light image incident on the non-total reflection surface 14C passes through the non-total reflection surface 14C without being reflected.

  The movable mirror 15 is movable between a first position facing the non-total reflection surface 14C and a second position not facing (non-facing) the non-total reflection surface 14C. Specifically, the movable mirror 15 moves between the first position and the second position by rotating around one end. The mirror drive unit 19 is composed of a motor or the like, and rotates the movable mirror 15.

  When the movable mirror 15 is in the first position, the mirror surface 15A of the movable mirror 15 and the non-total reflection surface 14C are almost in contact with each other. In this case, the optical image incident on the non-total reflection surface 14 </ b> C is reflected by the movable mirror 15. The light image reflected by the movable mirror 15 is returned to the optical path in the auxiliary prism 13A and enters the roof prism 13B. This optical image passes through the optical path in the roof prism 13B, erects, and exits from the exit surface 14B.

  The eyepiece 16 is disposed on the optical path of an upright optical image emitted from the exit surface 14B. When the movable mirror 15 is in the first position, an upright light image is incident on the eyepiece 16.

  On the other hand, when the movable mirror 15 is in the second position, the light image incident on the non-total reflection surface 14C passes through the non-total reflection surface 14C and is not reflected by the movable mirror 15, but the auxiliary prism 13A. It is injected outside. The image sensor 18 is disposed on the optical path of the light image emitted from the non-total reflection surface 14C.

  When the movable mirror 15 is in the second position, the optical image of the subject is incident on the image sensor 18. The image sensor 18 captures an incident light image, generates an image signal, and outputs it. For example, a CMOS (Complementary Metal Oxide Semiconductor) type image sensor or a CCD (Charge Coupled Device) type image sensor is used as the imaging element 18.

  A control unit 20 is electrically connected to the image sensor 18 and the mirror driving unit 19. When the shutter button 10B is pressed, the control unit 20 controls the mirror driving unit 19 to move the movable mirror 15 from the first position to the second position. And the control part 20 makes the image pick-up element 18 perform an imaging operation in the state which moved the movable mirror 15 to the 2nd position. When the imaging element 18 finishes the imaging operation, the control unit 20 controls the mirror driving unit 19 to move the movable mirror 15 from the second position to the first position.

  The memory 21 stores an image signal supplied from the image sensor 18. The imaging signal stored in the memory 21 can be read out to an external device such as a personal computer by wire or wirelessly.

  In FIG. 3, the second optical system 10 </ b> R includes an objective lens 22, an erecting prism 23, and an eyepiece lens 26. The objective lens 22 can be focused and zoomed like the objective lens 12 of the first optical system 10L. The operation of the objective lens 22 is performed in conjunction with the objective lens 12 of the first optical system 10L.

  The erecting prism 23 is composed of a roof prism 23B and an auxiliary prism 23A combined in a Schmidt-Pechan type. The auxiliary prism 23A has an incident surface 24A on which the light image of the subject from the objective lens 22 enters. The roof prism 23B has an exit surface 24B that emits an optical image of an upright subject. The entrance surface 24A and the exit surface 24B are substantially orthogonal to the optical axis AR.

  As with the auxiliary prism 13A of the first optical system 10L, the auxiliary prism 23A has a non-total reflection surface 24C that does not totally reflect because the incident angle of the optical image is smaller than the critical angle. A reflection film 24D for reflecting the optical image is formed on the non-total reflection surface 24C. Therefore, the erecting prism 23 is a general erecting prism, and the light image incident from the incident surface 24A passes through the optical path in the erecting prism 23 and erects and exits from the exit surface 24B.

  The eyepiece 26 is disposed on the optical path of the erecting light image emitted from the exit surface 24B of the erecting prism 23, and the erecting light image is incident thereon.

  The operation of the binoculars 10 configured as described above will be described. Regardless of whether the power is on or off, when the shutter button 10B is not pressed, the observer can observe the light image of the erect subject with the binoculars 10.

  A light image incident on the first optical system 10L from the subject passes through the objective lens 12 and enters the incident surface 14A of the auxiliary prism 13A. The light image incident from the incident surface 14A is incident on the non-total reflection surface 14C, but is reflected by the movable mirror 15 disposed at the first position facing the non-total reflection surface 14C. As a result, the optical image passes through the optical paths in the auxiliary prism 13A and the roof prism 13B, erects and exits from the exit surface 14B. The light image emitted from the exit surface 14 </ b> B is observed with the left eye of the observer through the eyepiece 16.

  The light image incident on the second optical system 10R from the subject passes through the objective lens 22 and enters the incident surface 24A of the auxiliary prism 23A. The light image incident from the incident surface 24A passes through the optical paths in the auxiliary prism 23A and the roof prism 23B, erects, and exits from the exit surface 24B. The light image emitted from the exit surface 24B is observed by the observer's right eye through the eyepiece lens 26.

  When the power is turned on and the shutter button 10B is pressed by the observer, the mirror driving unit 19 moves the movable mirror 15 from the first position to the second position under the control of the control unit 20. As a result, the light image incident on the first optical system 10L from the subject is emitted from the non-total reflection surface 14C of the auxiliary prism 13A and is incident on the image sensor 18. The imaging element 18 performs an imaging operation based on the control of the control unit 20 and outputs an imaging signal. This imaging signal is stored in the memory 21.

  When the imaging element 18 finishes the imaging operation, the mirror driving unit 19 moves the movable mirror 15 from the second position to the first position based on the control of the control unit 20.

  As described above, the binoculars 10 are provided with the movable mirror 15 for switching the optical path of the optical image at a position facing the non-total reflection surface 14C where the reflective film of the auxiliary prism 13A is not formed. Thus, there is no need to provide a movable mirror between the exit surface 14B of the roof prism 13B and the eyepiece 16. For this reason, the binoculars 10 can shorten the optical path and shorten the overall length.

  In the binoculars 10, the movable mirror 15 is moved between the first position and the second position, but the first position is positioned at a position where the movable mirror 15 contacts the non-total reflection surface 14C. Therefore, it is not necessary to provide a stopper for positioning. Further, since the second position may be a position where the movable mirror 15 is retracted from the optical path of the optical image emitted from the non-total reflection surface 14C, it is not necessary to accurately position the second position. For this reason, it is not necessary to provide the stopper for positioning also about a 2nd position. Thus, in the binoculars 10 of this embodiment, since it is not necessary to provide a stopper for positioning the movable mirror 15, the number of parts can be reduced and space can be saved.

  However, the movable mirror 15 has the mirror surface 15A substantially in contact with the non-total reflection surface 14C at the first position, so that both the movable mirror 15 and the auxiliary prism 13A are made of a material that is not easily damaged. Is preferred.

  Since the binoculars 10 are provided with the movable mirror 15 and the image sensor 18 only in the first optical system 10L, when the shutter button 10B is pressed and the movable mirror 15 moves from the first position to the second position, Although the 1 eyepiece portion EL is in a dark state for a moment, the observer can also observe the subject through the second eyepiece portion ER of the second optical system 10R at this time. There is little uncomfortable feeling due to the part EL becoming dark.

  In the first embodiment, the first optical system 10L provided with the movable mirror 15 and the image sensor 18 is an optical system for the left eye, and the second optical system 10R not provided with the movable mirror 15 and the image sensor 18 is used. Although the optical system is for the right eye, of course, this may be reversed.

  In the first embodiment, when the movable mirror 15 is disposed at the second position, the image sensor 18 directly receives the light image emitted from the non-total reflection surface 14C. An optical member such as a lens or a mirror may be provided between the non-total reflection surface 14 </ b> C and the image sensor 18, and a light image may be received through these optical members.

[Second Embodiment]
In the first embodiment, the movable mirror and the imaging device are provided only in the first optical system, but the second optical system may have the same configuration as the first optical system.

  In FIG. 4, the binoculars of the second embodiment have a second optical system 30R having the same configuration as the first optical system 10L of the first embodiment, instead of the second optical system 10R of the first embodiment. Yes. The second optical system 30R includes an objective lens 32, an erecting prism 33, a movable mirror 35, an eyepiece lens 36, and an image sensor 38. The objective lens 32, the erecting prism 33, the movable mirror 35, the eyepiece lens 36, and the imaging element 38 are respectively the objective lens 12, the erecting prism 13, the movable mirror 15, the eyepiece lens 16, and the imaging element 18 of the first optical system 10L. It is the same composition as. Focusing and zooming of the objective lens 32 are performed in conjunction with the objective lens 12.

  The erecting prism 33 is configured by combining a roof prism 33B and an auxiliary prism 33A in a Schmidt-Pechan type. The auxiliary prism 33A has an incident surface 34A and a non-total reflection surface 34C on which no reflective film is formed. The movable mirror 35 is provided on the non-total reflection surface 34C so as to come into contact with the non-total reflection surface 34C in the first position. The roof prism 33B has an exit surface 34B.

  The movable mirror 35 is driven by a mirror drive unit 39. The mirror driving unit 39 moves the movable mirror 35 between the first position and the second position described above.

  The control unit 20 is electrically connected to the image sensor 38 and the mirror driving unit 39. When the shutter button 10B is pressed, the control unit 20 controls the mirror driving units 19 and 39 to move both the movable mirrors 15 and 35 from the first position to the second position. Then, the control unit 20 causes the imaging elements 18 and 38 to perform an imaging operation in a state where the movable mirrors 15 and 35 are moved to the second position. When both the imaging elements 18 and 38 have finished the imaging operation, the control unit 20 controls the mirror driving units 19 and 39 to move both the movable mirrors 15 and 35 from the second position to the first position.

  Since the other configuration of the second embodiment is the same as that of the first embodiment, detailed description thereof is omitted.

  In the second embodiment, since the imaging signals from both the left and right viewpoints are acquired by the imaging elements 18 and 38 and stored in the memory 21, these imaging signals can be used for generating a stereo image.

[Third Embodiment]
In the first embodiment, the mirror surface 15A of the movable mirror 15 is brought into contact with substantially the entire surface of the non-total reflection surface 14C at the first position. However, the mirror surface 15A of the movable mirror 15 and the non-total reflection at the first position. The surface 14C may be non-contact.

  5 and 6, in the first optical system 40L of the third embodiment, guide members 41 are provided at both ends of the mirror surface 15A of the movable mirror 15 in the long side direction. The interval L1 between the two guide members 41 is set sufficiently larger than the width of the light beam of the optical image.

  In the movable mirror 15 arranged at the first position, the guide member 41 is in contact with the non-total reflection surface 14C. Therefore, in the first position, the movable mirror 15 has the mirror surface 15A and the non-total reflection surface 14C substantially parallel, and a gap G exists between them. Since the other configuration of the third embodiment is the same as that of the first embodiment, detailed description thereof is omitted.

  In the third embodiment, by providing the guide member 41 on the mirror surface 15A of the movable mirror 15, the mirror surface 15A and the non-total reflection surface 14C of the movable mirror 15 are not in contact with each other in the region where the light beam of the optical image passes. is there. Therefore, damage due to contact between the mirror surface 15A of the movable mirror 15 and the non-total reflection surface 14C is prevented. The guide member 41 is preferably formed of a material such as rubber that has elasticity and hardly undergoes plastic deformation.

  In the third embodiment, since the movable mirror 15 is positioned by the guide member 41 coming into contact with the non-total reflection surface 14C, the accuracy of the optical path of the light image reflected by the movable mirror 15 is the same as that of the first embodiment. Similarly expensive.

  In the third embodiment, in order to reduce scattering of a light image in the gap G, it is preferable to make the height of the guide member 41 as low as possible and to make the gap G small.

[Fourth Embodiment]
In the third embodiment, the guide member 41 is provided on the mirror surface 15A of the movable mirror 15. However, the guide member may be provided on both the mirror surface 15A and the non-total reflection surface 14C of the movable mirror 15.

  7 to 9, in the first optical system 50L of the fourth embodiment, the first guide member 51 and the first guide member 51 are respectively formed on the peripheral end of the mirror surface 15A of the movable mirror 15 and the peripheral end of the non-total reflection surface 14C. Two guide members 52 are provided. Both the opening of the mirror surface 15 </ b> A surrounded by the first guide member 51 and the opening of the non-total reflection surface 14 </ b> C surrounded by the second guide member 52 have a long side length L1 and are short. The length in the side direction is L2. The lengths L1 and L2 are sufficiently larger than the width of the light beam of the optical image.

  The first guide member 51 and the second guide member 52 are formed of plate-like magnets having different polarities. In this case, since the first guide member 51 and the second guide member 52 are attracted to each other at the first position of the movable mirror 15, displacement of the movable mirror 15 with respect to the non-total reflection surface 14C is prevented.

  Since the other configuration of the fourth embodiment is the same as that of the third embodiment, the detailed description thereof is omitted.

  In the first to fourth embodiments, the movable mirror is moved between the first position and the second position by rotating around one end as an axis. You may comprise so that it may move between a 1st position and a 2nd position by slidingly moving, maintaining a parallel state with a total reflection surface.

[Fifth Embodiment]
In the first to fourth embodiments, the second position that is not opposed to the non-total reflection surface of the movable mirror is the position retracted from the optical path of the optical image emitted from the non-total reflection surface of the auxiliary prism. The second position may be a position where the movable mirror is in the optical path of the light image emitted from the non-total reflection surface and reflects the light image in a direction not returning to the non-total reflection surface.

  10 and 11, in the first optical system 60L of the fifth embodiment, instead of the movable mirror 15 of the first embodiment, a movable mirror that rotates about an end portion opposite to the first embodiment as an axis. 65 is provided.

  The movable mirror 65 has a second position at which the light image emitted from the non-total reflection surface 14C is reflected in a direction substantially opposite to the direction of incidence of the light image on the first optical system 60L. A stopper member 67 is provided to position the movable mirror 65 at this second position. As shown in FIG. 11, the stopper member 67 contacts the back surface of the movable mirror 65 opposite to the mirror surface 65A. The movable mirror 65 is moved between the first position and the second position by the mirror driving unit 69.

  In the fifth embodiment, the image sensor 18 is disposed on the optical path of the light image reflected by the movable mirror 65 disposed at the second position, and captures the light image reflected by the movable mirror 65.

  As described above, in the fifth embodiment, the imaging element 18 can be disposed near the optical axis AL, and space saving can be further achieved.

  The above embodiments can be appropriately combined within a range where no contradiction occurs. In each of the above embodiments, binoculars are described as an example. However, the present invention can also be applied to optical observation apparatuses such as monoculars, telescopes, and microscopes.

DESCRIPTION OF SYMBOLS 10 Binoculars 10L, 40L, 50L, 60L 1st optical system 10R, 30R 2nd optical system 12, 22, 32 Objective lens 13, 23, 33 Erecting prism 14A, 24A, 34A Incident surface 14B, 24B, 34B Ejection surface 14C , 34C Non-total reflection surface 15, 35, 65 Movable mirror 16, 26, 36 Eyepiece 18, 38 Image sensor 19, 39, 69 Mirror drive unit 20 Control unit

Claims (8)

An objective lens;
An erecting prism that erects an optical image incident on the incident surface from the objective lens and emits it from the exit surface, and an erecting prism having a non-total reflection surface in the optical path from the incident surface to the exit surface;
A movable mirror that moves between a first position facing the non-total reflection surface and a second position not facing the non-total reflection surface;
When the movable mirror is in the first position, the movable mirror reflects the optical image incident on the non-total reflection surface through the optical path, so that the upright projected from the exit surface An eyepiece lens on which a light image is incident;
When the movable mirror is in the second position, an image sensor that picks up the optical image that is incident on the non-total reflection surface from the optical path and passes without being reflected by the non-total reflection surface;
An optical observation device.   The optical observation apparatus according to claim 1, wherein the movable mirror disposed at the first position is in contact with the non-total reflection surface.   The optical observation apparatus according to claim 1, wherein the movable mirror disposed at the first position is in non-contact with the non-total reflection surface via a gap. The erecting prism is composed of a Dach prism and an auxiliary prism combined in a Schmidt-Pechan type,
The optical observation apparatus according to claim 1, wherein the auxiliary prism has the non-total reflection surface.   The optical observation apparatus according to claim 4, wherein the optical image reflected by the movable mirror is incident on the roof prism when the movable mirror is in the first position. A control unit for controlling the movement of the movable mirror and the imaging operation of the imaging device;
The optical observation apparatus according to claim 1, wherein the control unit causes the imaging element to perform an imaging operation in a state where the movable mirror is moved to the second position. The movable mirror reflects the light image that has passed without being reflected by the non-total reflection surface in a state of being arranged at the second position,
The optical observation apparatus according to claim 6, wherein the image pickup device picks up the light image reflected by the movable mirror disposed at the second position. In binoculars having a first optical system and a second optical system,
At least one of the first optical system and the second optical system is
An objective lens;
An erecting prism that erects an optical image incident on the incident surface from the objective lens and emits it from the exit surface, and an erecting prism having a non-total reflection surface in the optical path from the incident surface to the exit surface;
A movable mirror that moves between a first position facing the non-total reflection surface and a second position not facing the non-total reflection surface;
When the movable mirror is in the first position, the movable mirror reflects the optical image incident on the non-total reflection surface through the optical path, so that the upright projected from the exit surface An eyepiece lens on which a light image is incident;
When the movable mirror is in the second position, an image sensor that picks up the optical image that is incident on the non-total reflection surface from the optical path and passes without being reflected by the non-total reflection surface;
Binoculars equipped with.

Images