JP2001174875A - Finder device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a finder device capable of contributing to the miniaturization of the entire device by contriving the arrangement of the transmissive reflection surface of an inverting optical system and setting the focal distance of an eyepiece optical system to be short so that necessary finder magnification is secured and a finder optical system is miniaturized. SOLUTION: This finder device is equipped with an objective optical system forming an observed image, the inverting optical system for making the observed image formed by the objective optical system an erect normal image, and the eyepiece optical system for observing the observed image. The inverting optical system is equipped with a 1st reflection surface 54a, a 2nd reflection surface 55a and a 3rd reflection surface 55b at least on the side of the objective optical system from an observed image forming position A and the transmissive reflection surface (4th reflection surface) 56a on the side of the eyepiece optical system, then a photometry means 15 is arranged on the extension of the optical path of incident light on the 4th reflection surface and a display means within a finder 60 is provided on the extension of the optical path of reflected light from the 4th reflection surface.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a finder device, and more particularly to a finder device for confirming and observing a visual field range including a desired observation image in a camera for photographing and the like.

[0002]

2. Description of the Related Art Conventionally, an observation image formed by an objective optical system is converted into an erect erect image via a reversing optical system, and this is a so-called real image type of construction which can be magnified and observed by an eyepiece optical system. Regarding the finder device, for example,
Various proposals have been made by, for example, US Pat.
It is also commonly used in practice.

The finder device disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 10-307315 is formed by a plurality of optical elements, and a transparent reflection surface is arranged at a predetermined position in an optical path of a finder optical system, thereby obtaining a desired view. A field of view for superimposing on the observation image of the subject a variety of information related to shooting, for example, field frame information for defining the field of view to be the shooting range, and the setting and operation state of the camera as a form that can be visually identified. This is a so-called daylighting type finder device in which means for displaying information (hereinafter referred to as finder display) is arranged separately from the finder optical system.

Further, the finder device disclosed in the publication includes photometric means for performing a photometric operation for automatically setting an exposure, and the finder device is provided with a means for performing the above-mentioned display in the finder. Each is provided with a light beam splitting means for guiding a light beam guided to the inside of the finder device. Thus, while observing the observed image of the subject, a predetermined photometric operation is performed with a light beam equivalent to the light beam forming the observed image, and the exposure at the time of photographing can be set.

In general, in a daylighting type finder device, a display plate is used as a means for performing various displays in the finder. This display plate forms an image of an observation image formed by an objective optical system. It is necessary to be arranged at a position that is substantially optically equivalent to the positional relationship between the position and the eyepiece optical system.

[0006]

However, according to the means disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 10-307315, the distance between the image forming position of the observation image formed by the objective optical system and the eyepiece optical system is determined. Is configured to have a plurality of reflecting surfaces, it is necessary to ensure a long distance between the image forming position of the observation image and the eyepiece optical system. Therefore, a display plate to be disposed at a position optically substantially equivalent to the distance between the image forming position of the observation image and the eyepiece optical system (see Japanese Patent Laid-Open No.
In the finder device disclosed in Japanese Patent Publication No. 307315, the distance between the liquid crystal display panel and the eyepiece optical system needs to be as long as the same distance. Therefore, Japanese Patent Laid-Open No.
The means disclosed in Japanese Patent No. 307315 has a problem in that the finder device itself is increased in size.

In a conventional finder device,
In order to make it easier to observe the observation image formed by the objective optical system, the finder magnification may be set large. For this purpose, for example, the individual optical elements constituting the finder optical system themselves are constituted by a large one, or the focal length of the eyepiece optical system, that is, the distance between the imaging position of the observation image and the eyepiece optical system is shortened. In general, means for devising the arrangement of the eyepiece optical system is used.

However, if the size of each optical element itself becomes large as in the former case, the finder device itself constituted by this becomes large, which is not a preferable means.

When the focal length of the eyepiece optical system is set to be short as in the latter means, there is a restriction in forming the inverting optical system. Therefore, the focal length of the eyepiece optical system is set short. There is a problem that there is a limit to what you can do.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object of the present invention is to provide a real image type finder device having a lighting window, and an inverting optical system constituting a part of the finder optical system. By arranging the transmissive reflection surface provided inside the camera and by setting the focal length of the eyepiece optical system to be shorter, the necessary finder magnification is secured and the finder optical system is downsized. And to provide a finder device that can contribute to miniaturization of the device itself.

[0011]

In order to achieve the above object, a finder device according to a first aspect of the present invention includes an objective optical system for forming an observation image, and an observation image formed by the objective optical system. In a finder device having a reversing optical system for erecting an image and an eyepiece optical system for observing an observation image, the reversing optical system is at least closer to the objective optical system than the imaging position of the observation image. It has a first reflecting surface, a second reflecting surface, and a third reflecting surface, and has a fourth reflecting surface formed of a transmissive reflecting surface on the side of the eyepiece optical system. It is characterized in that the photometric means is arranged on an extension of the optical axis incident on the reflection surface, and the in-finder display means is provided on an extension of the reflection optical axis of the fourth reflection surface.

According to a second aspect of the present invention, in the finder device according to the first aspect, there is further provided illumination means for illuminating the display means in the finder, and the display means in the finder is illuminated by the illumination means. A light transmitting portion that transmits a light beam, and a light non-transmitting portion that does not transmit the illumination light beam of the illuminating means are formed, and the light transmitting portion can be observed by the eyepiece optical system as a display in a finder. It is characterized by having done.

The finder device according to the third aspect of the present invention has an objective optical system for forming an observation image and a plurality of reflection surfaces for turning the observation image formed by the objective optical system into an erect image. In a finder device having an inversion optical system and an eyepiece optical system for observing an observation image, a final reflection surface arranged on the side closest to the eyepiece optical system among the plurality of reflection surfaces has a light transmitting property. It is formed by a reflecting surface, wherein the photometric means is arranged on an extension of the optical axis incident on the final reflecting surface, and the display means in the viewfinder is arranged on an extension of the reflecting optical axis of the final reflecting surface. .

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiments. The finder device of the present invention is used for, for example, a camera for taking a photograph or the like, and confirms a visual field of a photographing range including a desired subject image or confirms an observed image of a subject when photographing or the like. It is for doing. The embodiment described below shows an example in which the finder device of the present invention is applied to a camera.

FIGS. 1 and 2 show a camera to which a finder device according to an embodiment of the present invention is applied. FIG. 1 is a perspective view showing an appearance of the camera, and FIG. 2 shows an internal configuration of the camera. FIG. 2 is a block diagram showing a main part shown in FIG.

The main body and various components of the camera 1 according to this embodiment include a front cover 1a and a rear cover 1b, and a direction along the front surface of the front cover, that is, a photographing optical system 21a (described later).
Is covered with an exterior member formed by a barrier member 1c and the like slidably disposed in a direction orthogonal to the optical axis of the optical disk.

Various operation members and the like are arranged on the peripheral surface of the exterior member of the camera 1, and a predetermined position is set such that some of the various constituent members arranged inside are exposed to the outside. Are located in For example, on the upper surface of the camera 1, a release button 32, which is an operation member operated when starting a photographing operation, is used to perform various setting operations such as a photographing mode, setting of an internal clock, and setting related to a strobe function. Operating members such as a plurality of mode switching operation buttons 35a as operating members, a liquid crystal display (LCD), etc., and pictures, characters, etc. so that photographing mode information, date and time information, camera state information, etc. can be visually recognized. The information display member 36a for displaying in a predetermined form is provided.

On the front surface of the camera 1, a front surface of a strobe light emitting portion 27 (refer to FIG. 2) is protected at a predetermined position near one upper edge portion, and a flash from the light emitting portion 27 is directed forward of the camera 1. A strobe light emission window 27a for irradiating a predetermined range including the subject is arranged.

A substantially central portion of the front surface of the camera 1 is provided on the exposure surface of a roll-shaped film 5 (see FIG. 2) disposed inside the camera 1 so as to transmit a subject light beam contributing to photographing. An imaging optical system 21a for forming a subject image on the lens barrel 21b is disposed while being held by a lens barrel 21b.

A light projecting lens 1 constituting a part of a distance measuring device contributing to a distance measuring operation is provided at a predetermined position near an upper edge of an exterior member of the camera 1 at a peripheral portion of the photographing optical system 21a.
1 and a light-receiving lens 12 (detailed configuration of the distance measuring device will be described later), and an objective optical system which constitutes a part of the finder device of the present embodiment (a finder optical system in this finder device will be described later. A finder window 41a for covering and protecting the front surface of the finder device, and a lighting window 42 as illumination means for taking in natural light inside the finder device are provided. Further, a photographing optical system 2 is provided at a predetermined position on the back side of the camera 1 near the upper edge on one end side.
Zoom lever 4 operated when performing the zooming operation of 1a
3 and the like are arranged.

The barrier member 1c is connected to the front cover 1a.
Are slidably disposed in the direction of arrow X shown in FIG. That is, when the barrier member 1c moves in a predetermined direction, the main members arranged on the front surface of the camera 1, such as the photographing optical system 21a and the lens barrel 21b, the finder window 41a, the light projecting lens 11, and the light receiving lens 12 The closed state is such that the front surface of the lighting window 42 and the like is covered and protected by the barrier member 1c, and the open state is such that the front surfaces of these members are exposed to the outside and can perform a photographing operation. . The state shown in FIG. 1 represents the open state of the barrier member 1c.

As shown in FIG. 2, the camera 1 comprises various components provided inside the main body, various electric circuits, and the like. In the main body of the camera 1 according to the present embodiment, there is provided a control circuit 30 for controlling the entire camera 1 which is formed by a CPU or the like.
Various circuits and the like are electrically connected to the control circuit 30 directly or indirectly through various constituent circuits and the like.

That is, the control circuit 30 includes a DX code input circuit 2 for reading, for example, film information such as film ISO sensitivity from a DX code of a film cartridge 3 in which the film 5 is wound and stored, A film feeding circuit 4 for controlling the driving of a film feeding mechanism 7 via a film feeding motor 6 for feeding the film 5 sent from the film feeding device, and a film feeding operation by the film feeding circuit 4 during the film feeding operation. 5, a film feed state detecting circuit 24 for detecting the perforation and the like and detecting the amount of movement thereof, and a distance measuring means and a distance measuring device for measuring the distance to the main subject 9 located substantially at the center of the photographing screen. And a photometric unit formed by a photometric sensor 15 and the like for measuring the luminance of the field including the object 9 and the like. And ambient light measurement circuit 14, a shutter control circuit 16 which controls the driving of the plunger 18 is a drive mechanism for causing the opening and closing operation of the sector shutter 17 consisting of diaphragm-shutter blade for opening and closing the exposure opening portion,
A sector position detection switch 19 for detecting the position of the sector shutter 17, and a focus adjustment lens of the photographing optical system 21a held inside the lens barrel 21b based on subject distance information and the like obtained by the distance measurement circuit 8. A motor drive circuit 20 for driving and controlling a drive motor 22 that moves along the optical axis direction via a focus drive mechanism 23; a lens movement state detection circuit 25 for detecting a movement state of the focus adjustment lens from a reference position; Umbrella and Xenon (Xe)
A strobe circuit 2 for controlling light emission and charging of a strobe device including a strobe light emitting section 27 formed by a tube or the like.
6 and the first state responding to the operation state of the release button 32 arranged on the upper surface of the camera 1, that is, the first-stage ON state (half-pressed state) or the second-stage ON state (full-press state). (1st.) Release detection switch 33 and second
(2nd.) A release detection switch 34, a mode setting circuit 35 for setting an operation mode of the camera 1 in response to an operation of a plurality of mode switching operation buttons 35a (see FIG. 1),
A display circuit 36 for driving and controlling the information display member 36a (see FIG. 1); and a display circuit 3 in the finder for controlling display (to be described later in detail) in the field of view of the finder device.
7 and the like are directly or indirectly electrically connected.

When the film cartridge 3 is loaded into the camera 1, the DX code input circuit 2 converts a DX code or the like provided at a predetermined position on the outer peripheral surface of the cartridge 3 by, for example, printing or the like into a film ISO. It reads film information such as sensitivity.

The distance measuring circuit 8 constitutes a part of the distance measuring device as described above. This distance measuring device includes a light projecting element 10 including a light emitting diode (LED) or the like, which is a light emitting means that emits an infrared ray or the like, which is a light projecting means, and is directed toward a desired subject in a predetermined direction and for a predetermined time. Optical element 10
Light projecting lens 11 for irradiating light emitted from
A light receiving lens 12 that collects a reflected signal light in which a light beam emitted from the object is reflected by the subject 9 and a light receiving element 13 such as a light detection element (PSD) that is a light amount signal unit.

The operation of the distance measuring device will be briefly described as follows. That is, the distance measurement circuit 8 performs the above-described 1st. An on-signal from the release detection switch 33, which is an instruction signal for instructing the start of the distance measurement operation, is received from the control circuit 30 to drive the light emitting element 10 to emit light, and emit an infrared light beam or the like from the light emitting element 10. The light is projected toward the subject 9 via the lens 11. The reflected signal light is condensed via the light receiving lens 12 and is received by the light receiving element 13 via this. As a result, the distance measuring circuit 8 calculates the distance to the subject 9 based on the light receiving position of the light receiving element 13, and calculates the distance to the desired subject. The data (digital value) such as the subject distance information obtained here is transmitted to the control circuit 30, and a predetermined automatic focus adjustment operation is performed.

The shutter control circuit 16 controls the driving of the plunger 18 as described above, and
7 is a circuit for performing the opening / closing operation of 7. The sector shutter 17 is an aperture / shutter having a triangular aperture characteristic.

That is, the sector shutter 17 is provided with the plunger 1
8 is controlled by the shutter control circuit 16, the sector opening (exposure opening) is gradually opened by an ON signal from the plunger 18, while the sector opening (exposure opening) is opened by the OFF signal from the plunger 18. The exposure opening is rapidly closed.
In this case, the start time of the opening operation of the sector opening (exposure opening) is detected by the sector position detection switch 19.

The operation mode of the camera set by the mode setting circuit 35 includes, for example, a flash photography mode. In this strobe shooting mode, for example, an auto strobe mode in which a strobe light is automatically emitted or a strobe light is prohibited according to a shooting condition such as a subject brightness, or a strobe light emission is performed regardless of shooting conditions such as a subject brightness. There is a strobe off mode in which compulsory prohibition is performed, and a daylight sync mode in which strobe light is arbitrarily emitted according to a shooting condition such as a backlight condition or a desired subject in a shade outdoors in the daytime. The operation modes of the camera are not limited to this, and a film feeding operation mode for performing a continuous shooting operation, a self-timer mode and an interval timer for automatically generating a release signal after a predetermined time has elapsed. There are various things such as modes. These operation modes can be set by the mode setting circuit 35 or the like.

Next, a detailed configuration of the finder device of the present embodiment will be described below. FIG. 3, FIG. 4, FIG.
6, 7, and 8 are diagrams illustrating a main configuration of the finder device according to the present embodiment. 3 is a developed view of the optical system in which the finder optical system of the present finder device is developed, and conceptually shows a path of a light beam incident on the finder optical system. 3A shows a state where the finder optical system is set at the shortest focus position on the wide angle side, FIG. 3B shows a state where the finder optical system is set at the standard focus position, and FIG. Each state shows that the finder optical system is set at the longest focal position on the telephoto side.

FIG. 4, FIG. 5, and FIG. 6 are member arrangement diagrams mainly showing members constituting a finder optical system out of the constituent members of the present finder device, and showing the arrangement thereof. 4 is a perspective view, FIG. 5 is a top view, and FIG.
Are side views, respectively. 4 and 5
FIG. 6 is an optical path diagram showing the configuration of the finder optical system and also showing the optical path of the light beam incident on the finder optical system. 3 and FIG.
Fig. 3 shows an image forming position of an observation image by an objective optical system.

FIGS. 7 and 8 are perspective views showing the essential parts of the finder device, in which some of the constituent members of the finder device are taken out. FIG. 7 shows the configuration near the eyepiece optical system, and FIG. The configuration near the field frame is shown.

As shown in FIG. 3, the finder optical system in the finder device of this embodiment includes an objective optical system formed by a plurality of objective lens groups and a part of the inversion optical system, and another one of the inversion optical system. It is constituted by an eyepiece optical system formed by the part and the eyepiece 57.

The objective lens group is for receiving a light beam from a subject to form an observation image, and is constituted by a plurality of optical elements (lenses). That is, camera 1
Lens 5 fixed at a predetermined position on the front side of the main body
1 and a photographing optical system 21 movably provided in the optical axis direction.
It is formed by a second lens 52 and a third lens 53 which move to predetermined positions in conjunction with the zooming operation of a.

The reversing optical system is provided for converting an observation image formed by the objective lens group into an erect image, and is formed by three prisms. That is, the first prism 54 and the second prism 55 forming a part of the objective optical system, and the third prism 55 forming a part of the eyepiece optical system.
It is formed by the prism 56. The first prism 54 has a first reflecting surface 54a (first reflecting surface; see FIG. 6) on which a reflecting surface is formed by aluminum evaporation or the like. The second prism 55 includes a second reflecting surface 55a (a second reflecting surface) and a third reflecting surface 55b (a third reflecting surface; FIGS. 5 and 6) each including two total reflecting surfaces.
The third prism 56 has one transmissive reflection surface 56.
a (a fourth reflecting surface composed of a so-called half mirror; FIG. 5)
(See FIG. 8).
Note that the transmissive reflection surface 56a, which is the fourth reflection surface, is the final reflection surface in the finder optical system of the present finder device.

The objective optical system includes an objective lens group including the above-described first, second, and third lenses 51, 52, and 53, and first and second prisms 54 and 55 of the inverting optical system. ing.

On the other hand, the eyepiece optical system is provided for forming an enlarged image suitable for observing the observation image formed as an erect erect image by the inverting optical system. A third prism 56 and an eyepiece (a so-called loupe) 57 are provided.

As shown in FIG. 3, the second prism 55
The third prism 56 and the third prism 56 are arranged so as to have a predetermined interval therebetween, that is, an interval indicated by reference numerals D1 and D2 in FIG. Note that the observation image formed by the objective optical system is set so as to form an image in a focused state at a position indicated by reference numeral A in FIG. Therefore, in the following description, the position indicated by reference numeral A in FIG. 3 is referred to as an image forming position. Each optical element (a lens, a prism, etc.) constituting each optical system is shown in FIG.
-Each is arrange | positioned as shown in FIG.5, FIG.6.

On the other hand, in addition to an optical system for forming an observation image, a fourth prism 5 for adjusting the traveling direction of a light beam as shown in FIG. 4, FIG. 5, and FIG.
8 are provided. The fourth prism 58 is attached to a surface outside the surface of the third prism 56 on which the transmissive reflection surface 56a (the fourth reflection surface) is provided,
Thereby, it is provided integrally with the third prism 56.

In the vicinity of the fourth prism 58, a photometric sensor 15 constituting a part of photometric means at a predetermined position, and predetermined information, ie, finder visual field information, are superimposed on the observation image within the range of the finder visual field. A finder display panel 60, which is a finder display means for displaying the image so that it can be observed and observed, is provided.

The photometric sensor 15 is provided on the optical path of the light beam that passes through the transmissive reflection surface 56a of the third prism 56 and travels straight, that is, on the extension of the optical axis incident on the transmissive reflection surface 56a.
It is arranged at a predetermined position so that the light receiving surface faces the condenser lens 58a of the prism 58.

After being reflected by the transmissive reflection surface 56a of the third prism 56, the display panel 60 in the finder is
7, the third prism 56 and the fourth prism 58 are on the extension of the optical axis (optical path) of the light beam traveling toward 7, that is, the extension of the reflection optical axis of the transmissive reflection surface 56a (the fourth reflection surface). The camera 1 is arranged at a predetermined position on the opposite side to the side where the eyepiece lens 57 is arranged, that is, at a predetermined position from the front surface of the camera 1. The position where the in-finder display panel 60 is disposed is set so as to be substantially optically equivalent to the image forming position of the observation image formed by the objective optical system.

FIG. 9 is an enlarged view showing only the display plate in the viewfinder of the present viewfinder apparatus. The display plate 60 in the finder is formed of a thin plate-like member provided with a plurality of light transmitting portions (60a, 60b, 60c, 60d) of a predetermined form at predetermined positions. It is desirable that each of the plurality of light transmitting portions is formed by a light diffusing surface. The light illuminating the plurality of light transmitting portions is diffused by forming the light diffusion surface, whereby the display can be more clearly observed.

The light transmitting portion of this predetermined form is provided in order to display in a form which can be visually recognized in the viewfinder and to display the viewfinder visual field information by a predetermined means, for example, as shown in FIG.
As shown in the figure, a part of a plate-like member is formed by drilling in a predetermined form such as a character, pictogram, or symbol.

In FIG. 9, reference numeral 60a denotes an example of a display for indicating information on the flash device.
b is an example of a display for representing information on a photographing operation, and reference numeral 60c is an example of a display for representing an index of parallax correction, which is information on a range of a finder visual field. Reference numeral 60d denotes an example of a display in the finder which is located at a substantially central portion of the finder field of view and indicates a target mark which serves as an index when performing a distance measuring operation or a photometric operation. The form of the light transmitting portion is not limited to these display examples, and various other forms are naturally conceivable. Further, a portion other than the light transmitting portion of the in-finder display panel 60 (a portion indicated by reference numeral 60e in FIG. 9) is formed so as not to transmit a light beam. This portion is referred to as a light opaque portion 60e.

As shown in FIGS. 5 and 6, in front of the display panel 60 in the finder, that is, in front of the camera 1, natural light is taken in from the outside of the camera body so that the display panel 60 in the finder is exposed to natural light. A lighting window 42 made of ground glass or the like is provided as lighting means (first lighting means) for lighting. The inner surface side of the daylighting window 42, that is, the surface facing the inside of the camera 1, is subjected to processing to be a diffusion surface.

On the other hand, the fourth prism which enters the third prism 56 from the side of the second prism 55, and which is not reflected by the transmissive reflection surface 56a of the third prism 56 but passes through and passes straight therethrough. A condensing lens 58a is integrally provided on the light path of the same light beam on the exit surface 58b of the light source 58. The condensing lens 58a is set so as to converge the incident light beam and emit the light beam in a predetermined direction, that is, toward the light receiving surface of the photometric sensor 15.

As described above, the fourth prism 58 guides the luminous flux transmitted without being reflected by the transmissive reflection surface 56a of the third prism 56 to the photometric sensor 15, and at the same time, the lighting window 42
Thus, the luminous flux transmitted through the finder display panel 60 and transmitted through the transmissive reflection surface 56a of the third prism 56 is directed to the eyepiece lens 57 side. Therefore, the fourth prism 58 having such a role does not directly contribute to the function for observing an observation image or the like. Therefore, in the development view of the finder optical system shown in FIG. 3, the description of the fourth prism 58 is omitted.

On the other hand, as shown in FIG. 7, in front of the display panel 60 in the finder, that is, on the side where the lighting window 42 is provided, the display panel 60 in the finder is located at a position facing the display panel 60 in the finder. Second illumination means for illuminating with the electric light emitting element is arranged.

The second illuminating means includes a predetermined flexible printed circuit board 62, light emitting diodes (hereinafter, referred to as LEDs) 62 a, 62 b, 62 c which are electric light emitting elements mounted on the flexible printed circuit board 62, and , And a display circuit 37 (see FIG. 2) in the finder.

The second illuminating means is supported by a field frame member 61 shown in FIG. 8, but in FIG. 7, the drawing of the flexible printed circuit board 62 and the display panel 60 in the finder is avoided to avoid complication of the drawing. The view frame member 61 is not shown in order to clearly show the positional relationship (view frame member 6
1 for details of FIG. 8).

Therefore, in this case, the LED
In a state where the flexible printed board 62 on which 62a, 62b, and 62c are mounted is arranged at a predetermined position by the field frame member 61, the light emitting portion of the LED 62a is located at a position facing the light transmitting portion 60a of the display panel 60 in the finder. LE
The light emitting part of D62b is arranged at a position facing the light transmitting part 60b of the display panel 60 in the finder, and the light emitting part of the LED 62c is arranged at a position facing the light transmitting part 60c of the display panel 60 in the finder. .

Then, the LEDs 62a, 62b, 62c
Is controlled by the above-described finder display circuit 37 so as to be turned on or off according to conditions corresponding to the photographing mode and the photographing operation. Therefore, the corresponding light transmitting portions 60a, 60b, 60c are illuminated by these LEDs 62a, 62b, 62c under predetermined conditions.

As described above, in the present embodiment, the light transmitting section 60a is displayed in the viewfinder for displaying information on the flash device. Therefore, the corresponding LED 62a is controlled to be turned on or off at the following times. For example, as a result of a photometric operation by the photometric device, the flash device is turned on when it is determined that the surrounding environment has low brightness, or when the mode is switched to a shooting mode involving flash emission (such as a flash forced flash mode), the state of the flash device (charge). The status is checked, and flashing is performed when the flash is being charged, and the flash is turned on when the preparation of the flash device is completed. This makes it possible to visually confirm whether or not a strobe light emission operation is required.

Further, since the light transmitting section 60b displays the information in the finder for displaying information on the photographing operation, the corresponding LED 62b is turned on for a predetermined time when it is determined that the shutter release operation is normally completed. For example, the control is performed such that the light is continuously turned on or the light is turned on and off when any abnormality is detected during the shutter release operation. This makes it possible to visually confirm whether or not the release operation has been performed.

The light transmitting portion 60c is information on the range of the finder visual field, and is displayed in the finder to indicate an index of parallax correction. Therefore, the corresponding LED 62c is operated by the distance measuring means, for example. As a result, when the distance to the desired subject is determined to be shorter than the predetermined distance, the light is turned on, and control is performed to display a finder field frame in which parallax has been corrected during close-up shooting. As a result, it is possible to visually confirm the index of the finder visual field in which parallax generated during close-up shooting has been corrected.

The flexible printed circuit board 62
It is arranged on the front side of the finder display panel 60, that is, on the side where the lighting window 42 is provided. The shape is such that a partial area of the display panel 60 in the finder, that is, an area corresponding to a predetermined light transmitting portion (the light transmitting portion 60d in the present embodiment) is exposed. (In the present embodiment, the light transmitting portions 60a, 60b, and 60c) are shaped so as to be covered by the flexible printed circuit board 62. In other words, this means that the light transmitting portions 60a and 60a other than the light transmitting portion 60d
This means that 60b and 60c are prevented from being illuminated, and serve to shield light. Therefore, the incident light beam from the lighting window 42 illuminates only a specific light transmitting portion (60d) of the display panel 60 in the finder, and the flexible printed circuit board 6
Reference numeral 2 is formed in such a shape as to shield the other light transmitting portions (60a, 60b, 60c) from light.

In this embodiment, a flexible printed circuit board is used, but it is a matter of course that a normal hard board may be used. In addition to this, if the surface of the flexible printed board or the hard board is coated with black or if these are made of a black material, the light-shielding properties can be improved.

Further, at a predetermined position in front of the display panel 60 in the finder (on the side of the lighting window 42) and at a position where the light transmitting portion 60d of the display panel 60 in the finder can be illuminated, the above-mentioned LEDs 62a, 62b. An LED 62d, which is an electric light emitting element similar to 62c, is provided. This LE
D62d is electrically connected to the display circuit 37 in the finder mounted on the above-described flexible printed circuit board 62 or the like. However, in FIG. 7, wirings and the like are omitted in order to avoid complication of the drawing. I have.

As described above, the light transmitting portion 60d of the finder display panel 60 in the finder device is provided with the lighting window 42.
LED 62 which is always illuminated by a natural luminous flux entering from above and which is turned on or blinked under predetermined conditions
d.

In the present embodiment, the light transmitting portion 60d is a display in the finder that indicates a target mark that is an index when performing a distance measuring operation or a photometric operation. Therefore, the corresponding LED 62d is controlled to be turned on or off at the following times. For example, as described above, L
Even when the ED 62d is off, the light transmitting portion 60d
It is always displayed by natural light illumination. In this state, the display by the light transmitting unit 60d serves as an index (target mark) at the time of the distance measuring operation or the photometric operation. And 1st. Release detection switch 3
The instruction signal from 3 is issued, and the distance measuring operation is performed by the distance measuring means. This is normally completed, and the predetermined focus adjustment operation based on the result of the distance measurement is completed by the predetermined lens driving mechanism or the like. At times, the display circuit 37 in the finder performs control to turn on the LED 62d. This makes it possible to visually confirm that the focus adjustment operation for the desired subject has been completed.

FIG. 10 shows a normal state of the finder device, that is, the LEDs 62a, 62b, 62c, and 62.
3D shows the display in the viewfinder field of view 70 in a state in which the display panel 60 in the viewfinder is illuminated only by natural light and the display panel 60 in the viewfinder is illuminated.

In this state, the light transmitting portions 60a, 60b,
The displays 70a, 70b, and 70c (these are not normally observed) corresponding to 60c are in a non-display state in which none of them are displayed, and only the corresponding display 70d is displayed by illumination with a natural light beam. It will be. .

By the way, the display panel 60 in the finder described above is used.
And the flexible printed circuit board 62 are held by a field frame member 61 provided for forming a finder field frame near an image forming position of an observation image by the objective optical system. As shown in FIG. 8, the field frame member 61 is formed of a member having a substantially L-shaped cross section. One arm 61 e, which is one arm, includes a second prism 55 and a third prism 56. Are arranged in the vicinity of the imaging position in the space provided therebetween.

The one arm portion 61e of the field frame member 61 is provided with a substantially rectangular opening, ie, a field frame opening 61k, near the substantially central portion of the surface of the second prism 55 facing the emission surface 55k. The optical path of the light flux from the second prism 55 to the third prism 56 is not obstructed. At the same time, the range of incidence of the same light beam on the third prism 56 is regulated to define the range of the field frame in the present finder device.

In the vicinity of the distal end of the one arm portion 61e, a surface of the second prism 55 facing the exit surface 55k is implanted at a predetermined position on the rear outer edge of the exit surface 55k. A hole 61g and an elongated hole 61h into which the two support pins 55g and 55h are fitted are provided. Therefore, when the two support pins 55g and 55h of the second prism 55 are fitted into the hole 61g and the elongated hole 61h of the field frame member 61, the second prism 55 is connected to the field frame member 61.
Is supported and held at a predetermined position.

On the other hand, the other arm portion 61f, which is the other arm portion of the field frame member 61, is connected to the fourth
It is arranged at a predetermined position facing the incident surface 58c of the prism 58. Then, as described above, the display panel 60 in the finder (display means in the finder) and the LEDs 62 a, 62 b, and 62 mounted on the flexible printed circuit board 62.
c (a second illumination means) is positioned so as to be at a predetermined position inside the present finder device, and serves as a holding section for holding them.

In this case, at predetermined positions inside the upper end and lower end of the other arm portion 61f of the field frame member 61 and on the side facing the fourth prism 58, the groove portions are formed so as to face each other. 61m (the lower end is not shown in FIG. 8) is provided, and the finder display panel 60 is set in the groove 61m.

FIG. 8 shows a state in which the display panel 60 in the finder is removed from the field frame member 61. From this state, the display panel 60 in the finder is fitted into the groove 61m of the field frame member 61, and the display panel 60 in the finder is further inserted.
Is slid in the arrow X direction shown in FIG. 8, whereby the in-finder display panel 60 is arranged at a predetermined position of the field frame member 61.

On the other hand, as described above, the display panel 6
In the other arm portion 61f of the field frame member 61 in a state where the “0” is integrally provided, the notch opening 61aa is provided at a position facing the light transmitting portions 60a, 60b, 60c, and 60d of the display panel 60 in the finder.・ 61bb ・ 61cc
-61dd is provided. In addition, in the vicinity of each of the notch openings 61aa, 61bb, and 61cc and on the surface facing the lighting window 42, the recesses 61a and 6 are provided.
1b and 61c are provided.

The flexible printed board 62 is arranged on the surface of the other arm portion 61f of the field frame member 61 facing the lighting window 42. In this case, the flexible printed board 62 is mounted on the flexible printed board 62. LED
62a, 62b and 62c are concave portions 61a and 6 respectively.
1b and 61c. At this time, the LED 62
The light emitting portions a, 62b, and 62c are arranged at positions corresponding to the notched openings 61aa, 61bb, and 61cc, respectively. Thus, the LEDs 62a, 62b, and 62c are held by the recesses 61a, 61b, and 61c, so that the flexible printed board 62 is reliably held by the field frame member 61. At the same time, the LED 62a
The light-emitting portions 62b and 62c are arranged so as to be exposed from the corresponding cutout openings 61aa, 61bb and 61cc to the display panel 60 in the finder. However, the light emitting portions of the LEDs 62a, 62b, and 62c are arranged so as to fall within the range of the viewing frame member 61 in the thickness direction.

Therefore, the light transmitting portions 60a, 60b, and 60c of the finder panel 60 are illuminated only by the corresponding light emitting portions of the LEDs 62a, 62b, and 62c. Note that the LEDs 62a and 6
Since the light-emitting portions 2b and 62c are arranged so as to be within the range in the thickness direction of the field frame member 61 as described above, the illumination light from each light-emitting portion transmits light corresponding to each. Only the portions 60a, 60b, and 60c are illuminated so as not to affect other light transmitting portions. That is,
Illumination light from each light-emitting unit is configured to illuminate only in (a light transmission part of) a predetermined direction, and illumination light in other directions is shielded by the wall surface of the field frame member 61.

The LED 62d is provided in the space between the lighting window 42 and the field frame member 61 as described above.
The position is opposed to the cutout opening 61dd of the other arm portion 61f, and the light transmitting portion 60d of the display plate 60 in the finder is arranged behind the cutout opening 61dd. Therefore, the illumination light from the light emitting section of the LED 62d can pass through the notch opening 61dd to illuminate the light transmitting section 60d.

Then, the flexible printed circuit board 62
Is disposed on the surface of the field frame member 61 on the side where the lighting window 42 is provided. At this time, the notch openings 61aa, 61bb, and 61cc are covered by the flexible printed circuit board 62 and the LEDs 62a, 62b, and 62c. It has become. At the same time, the notch opening 61dd is formed in a predetermined range by the substrate 62 so that the notch opening 61dd is exposed.
2dd is provided.

As a result, natural light entering the camera body from the lighting window 42 is shielded without illuminating the light transmitting portions 60a, 60b, and 60c of the display panel 60 in the finder, and is also transmitted to the light transmitting portion 60d. Is always illuminated.

The image formation position of the observation image formed by the objective optical system (the position indicated by reference numeral A in FIG. 3) is set as follows. In the finder device of the present embodiment, as described above, the second prism 55 (first optical element) is disposed closer to the objective optical system than the imaging position A of the observation image, and the third prism 55 (first optical element) 2) is disposed closer to the eyepiece optical system than the imaging position A of the observation image.

In this case, for example, the focal length of the eyepiece optical system is f (mm), the exit surface (55k; see FIG. 8) of the second prism 55 (first optical element) and the image forming position A of the observed image. Is defined as D1 (mm), and the incident surface of the third prism 56 (second optical element) and the image forming position A of the observed image
If the distance set to a D2 (mm) of the (see FIG. ^{3), D1> f 2/} 250 and D2> f ^2/250 imaging position A so as to satisfy that the is set. This indicates the position of the exit surface of the second prism 55 or the entrance surface of the third prism 56 with respect to the image formation position of the observation image observed by the eyepiece 57. According to the above-mentioned conditional expression, the observation diopter at the position of the exit surface of the second prism 55 and the position of the entrance surface of the third prism 56 are each 4 diopters (1 / m) with respect to the observation diopter at the imaging position. It indicates that the distance is set to be larger. That is, the surfaces on the image forming position side of the second prism 55 and the third prism 56 are separated from the image forming position of the observation image by a sufficient distance, so that the surfaces of the second prism 55 and the third prism 56 are attached to the surface. The conditions are set to prevent the observed dust and the like from being observed.

That is, the human eye can observe an object even if the diopter is slightly deviated within a certain diopter range. This prevents dust and the like adhering to the surfaces of the prism 55 and the third prism 56 from being observed.
In addition, the amount of deviation of the diopter is 3 to 4 in actual use.
A diopter (1 / m) distance is enough,
It is more effective if the distance is about 6 diopters (1 / m).

Although the focal length f of the eyepiece optical system is usually about 20 to 30 mm in the normal case, the focal length f is shorter than that in the normal case so as to be about 10 to 20 mm. Then, the distances D1 and D2 can be set small. Accordingly, by reducing the size of the finder device and increasing the magnification by the eyepiece optical system, the finder magnification can be set to a large value without increasing the size of the objective optical system. From the above points, in this embodiment, the focal length of the eyepiece optical system is set to about 15 mm. If the focal length f of the eyepiece optical system is shorter than about 10 mm, it is difficult to arrange a reflecting surface between the image forming position and the eyepiece, which is not preferable.

In the present embodiment, in order to make it possible to shorten the focal length of the eyepiece optical system, the reflecting surface of the inverting optical system is placed on the side of the objective optical system with respect to the image forming position of the observation image. Three surfaces (a first reflecting surface 54a and a second reflecting surface 55a).
The third reflecting surface 55b) is arranged, and one surface (transmissive reflecting surface 56a) is arranged on the side of the eyepiece optical system.

Further, as described above, the display panel 60 in the finder needs to be disposed at a position optically equivalent to the position at which the observation image is formed.
By devising the focal length of the eyepiece optical system, the eyepiece optical system and the display panel 60 in the finder can be arranged close to each other, so that the size of the apparatus itself can be reduced.

The operation of the finder device according to the present embodiment thus configured will be described below. First, the first
The light beam from the subject incident from the lens 51 is incident on the first prism 54 via the second lens 52 and the third lens 53, and is reflected on the first reflecting surface 54a of the first prism.
Thereby, the optical path of the same light beam is bent at an angle of approximately 90 degrees, and is directed upward in FIG. 4 to enter the second prism 55.

The light beam incident on the second prism 55 is reflected on the second reflection surface 55a and the third reflection surface 55b of the second prism 55, respectively, so that the optical path is changed and the second prism 55 Exit surface 55k
After being emitted from (see FIG. 8) and passing through the field frame opening 61k of the field frame member 61 and restricted to a predetermined range, the light beam enters the third prism 56.

A part of the light beam incident on the third prism 56 is reflected by the transmissive reflection surface 56a of the third prism 56, and its optical path is bent at an angle of about 90 degrees and guided to the eyepiece lens 57 side. Therefore, the observation image can be observed by the eyepiece 57.

The other part of the light beam incident on the third prism 56 passes through the transmissive reflection surface 56a of the third prism 56, and is guided to the photometric sensor 15 via the condenser lens 58a. As a result, a state in which a predetermined photometric operation can be performed is achieved.

In addition to the incident light beam from the first lens 51 described above, a natural light beam enters the interior of the finder device from the lighting window 42 as well. This light flux passes through the finder display panel 60 as shown in FIGS. 5 and 6, then enters the fourth prism 58, passes through the transmissive reflection surface 56a of the third prism 56, and then goes straight on. To the eyepiece 57. Accordingly, in the eyepiece lens 57, as described above, the observation image formed by the incident light beam from the first prism 54 is displayed on the display panel 60 in the viewfinder formed by the incident light beam from the lighting window 42, that is, the light transmitting portion. 60d
Display of the form represented by (target mark, etc.)
Is superimposed on the viewfinder image.

When a plurality of LEDs 62a, 62b, 62c, 62d are controlled to be turned on or off in accordance with the operating conditions of the camera 1, each of the LEDs 62a, 62b, 6
The display corresponding to each of 2c and 62d, that is, the display in the form represented by the light transmitting portions 60a, 60b, 60c, and 62d is performed.

As described above, according to the above-described embodiment, the field frame member 61 for defining the field frame is formed to have a substantially L-shaped cross section, and the field frame opening is provided in the one arm portion 61e. The other arm portion 61f is integrally formed with a holding portion for holding the display panel 60 in the finder which is a means for displaying the visual field information, so that the field frame member 61 and the display in the finder can be displayed without increasing the number of parts. It is easy to accurately set the positional relationship with the plate 60, and it is also possible to suppress an increase in the size of the apparatus and to contribute to a reduction in manufacturing costs.

In this embodiment, the reflecting surface of the reversing optical system is provided with three surfaces (the first reflecting surface 54a, the second reflecting surface 55a, and the second reflecting surface 55a) on the side of the objective optical system with respect to the imaging position of the observation image. The third reflecting surface 55b) is arranged, and one surface (transmissive reflecting surface 56a) is arranged on the side of the eyepiece optical system. Thereby, the focal length of the eyepiece optical system can be set short. Thereby, the distances D1 and D2 between the second prism 55 and the third prism 56 with respect to the imaging position of the observation image formed by the objective optical system can be set small. Accordingly, this makes it possible to set the finder magnification to a large value without increasing the size of the objective optical system, to make it easier to see the observation image, and to easily realize the miniaturization of the finder device itself.

Further, the eyepiece optical system and the display panel 60 in the finder can be arranged close to each other by devising the configuration of the inverting optical system and the focal length of the eyepiece optical system as in the present embodiment. The size can be reduced.

[Supplementary Note] According to the above-described embodiment, an invention having the following configuration can be obtained.

(1) An objective optical system for forming an observation image, an inversion optical system for converting the observation image formed by the objective optical system into an erect image, and an eyepiece for observing the observation image. The inverting optical system includes a first reflecting surface, a second reflecting surface, and a third reflecting surface that are at least closer to the objective optical system than an image forming position of an observation image. The optical system has a fourth reflecting surface which is a final reflecting surface of the reversing optical system which is a transmissive reflecting surface on the side of the optical system,
Photometric means provided on an extension of the optical axis incident on the fourth reflection surface, display means in the finder provided on an extension of the reflection optical axis of the fourth reflection surface, and display of the display means in the finder Illumination means comprising an electric light emitting element for illuminating the unit, and the display means in the finder,
A finder device comprising a light transmitting portion illuminated by the illumination means and a light non-transmissive portion that does not transmit the illumination by the illumination means, wherein the light transmission portion can be observed as a display in the finder.

(2) An objective optical system for forming an observation image, an inversion optical system for converting the observation image formed by the objective optical system into an erect image, and an eyepiece for observing the observation image. In the finder device having a system, the reversing optical system includes a first reflecting surface, a second reflecting surface, and a third reflecting surface on at least the objective optical system side with respect to an imaging position of an observation image. A fourth reflecting surface that is a final reflecting surface of the inverting optical system that is formed of a transmissive reflecting surface on the side of the eyepiece optical system;
Photometric means arranged on an extension of the optical axis incident on the fourth reflecting surface; display means in the finder arranged on an extension of the reflecting optical axis of the fourth reflecting surface; and display means in the finder Lighting means for illuminating the display section with natural light;
The display means in the finder comprises a light transmitting part illuminated by the lighting means and a light opaque part which does not transmit the illumination by the lighting means, and the light transmitting part can be observed as a display in the finder. A certain finder device.

(3) An objective optical system for forming an observation image, an inversion optical system for converting the observation image formed by the objective optical system into an erect image, and an eyepiece for observing the observation image. In the finder device having a system, the reversing optical system includes a first reflecting surface, a second reflecting surface, and a third reflecting surface on at least the objective optical system side with respect to an imaging position of an observation image. A fourth reflecting surface that is a final reflecting surface of the inverting optical system that is formed of a transmissive reflecting surface on the side of the eyepiece optical system;
Photometric means arranged on an extension of the optical axis incident on the fourth reflection surface, display means in the viewfinder arranged on an extension of the reflection optical axis of the fourth reflection surface, and display means in the viewfinder A first illuminating unit for illuminating the display unit with natural light, and a second illuminating unit including an electric light emitting element for illuminating the display unit of the finder display unit,
The finder device wherein the display unit in the finder includes a light transmitting portion illuminated by the illuminating device and a light non-transmitting portion that does not transmit the illumination by the illuminating device, and the light transmitting portion can be observed as a display in the finder.

(4) In the finder device according to supplementary note (3), the display means in the finder may include a first light transmitting portion illuminated by the first illuminating means and / or the second illuminating means. , A second light transmitting portion illuminated only by the second illuminating means.

[0096]

As described above, according to the present invention, in a real image type finder device having a lighting window, the arrangement of a transmissive reflection surface provided inside an inversion optical system constituting a part of a finder optical system. In addition, by setting the focal length of the eyepiece optical system to be shorter, the necessary finder magnification can be secured, and the size of the finder optical system can be reduced, thereby contributing to the miniaturization of the device itself. A finder device can be provided.

[Brief description of the drawings]

FIG. 1 is a perspective view showing the appearance of a camera to which a finder device according to an embodiment of the present invention is applied.

FIG. 2 is a main block diagram showing the internal configuration of a camera to which the finder device according to the embodiment of the present invention is applied.

FIG. 3 is a view showing a main configuration of a finder device according to an embodiment of the present invention, and is an expanded view of an optical system in which the finder optical system in the finder device is developed.

FIGS. 4A and 4B are a perspective view and an optical path diagram showing an arrangement of members by mainly taking out members constituting a finder optical system among constituent members in the finder device of FIG. 3;

FIGS. 5A and 5B are a top view and an optical path diagram showing an arrangement of members mainly taken out of members constituting a finder optical system among constituent members in the finder device of FIG. 3;

FIGS. 6A and 6B are a side view and an optical path diagram showing an arrangement of members taken out mainly of members constituting a finder optical system among constituent members in the finder device of FIG. 3;

FIG. 7 is an essential part perspective view showing the vicinity of an eyepiece optical system out of constituent members of the finder device of FIG. 3;

FIG. 8 is a perspective view of an essential part of the configuration of the finder device shown in FIG. 3, showing a configuration in the vicinity of a finder field frame;

FIG. 9 is an enlarged view showing only a display plate in a finder in the finder device of FIG. 3;

FIG. 10 is a diagram showing an example of a normal state of the finder device of FIG. 3, in which all of the light emitting elements are turned off, and the display panel in the finder is illuminated only by natural light.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Camera 14 ... Ambient light measurement circuit (photometry means) 15 ... Photometry sensor (photometry means) 21a ... Photographing optical system 21b ... Lens barrel 30 ... Control circuit (control means) 32 ... Release button 37 finder display circuit (finder finder display) 41a finder window 42 lighting window (illuminator; first illuminator) 51 first lens (objective optical system) 52 second lens (Objective optical system) 53 Third lens (Objective optical system) 54 First prism (Objective optical system / reversing optical system) 54a First reflective surface (First reflective surface) 55 Second Prism (objective optical system / reversal optical system; 1st)
55a... Second reflecting surface (second reflecting surface) 55b... Third reflecting surface (third reflecting surface) 55g and 55h... Support pins 56... Third prism (inverting optical system) Eyepiece optical system; 2nd
56a ... transmissive reflection surface (fourth reflection surface, final reflection surface) 57 ... eyepiece lens (eyepiece optical system) 58 ... fourth prism 58a ... condenser lens 60 ... display in viewfinder Plate (display means in viewfinder) 60a / 60b / 60c / 60d: light transmitting portion 60e: light non-transmitting portion 61: field frame member 61a / 61b / 61c ... concave portion 61aa / 61bb / 61cc / 61dd ... notch Opening 61e One arm 61f Other arm (holding part) 61k Field of view frame opening 62 Flexible printed circuit board (second lighting means) 62a, 62b, 62c LED (light emitting diode;
Light-emitting element: second illumination means) 62d: LED (light-emitting diode; light-emitting element) A: Image forming position of observation image

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Shinya Takahashi 2-43-2 Hatagaya, Shibuya-ku, Tokyo Inside Olympus Optical Industrial Co., Ltd. (72) Inventor Shigeru Kato 2-43-2 Hatagaya, Shibuya-ku, Tokyo Olympus Optical Co., Ltd. F term (reference) 2H002 DB05 2H018 AA04 AA06 BA02 BA04 BE02 2H102 AA01 AA41 AA66 AB13 AB17 BA03 BB09 BB26 CA34

Claims (3)

[Claims] 1. An objective optical system for forming an observation image, an inversion optical system for converting an observation image formed by the objective optical system into an erect image, and an eyepiece optical system for observing the observation image. Wherein the inverting optical system has a first reflecting surface, a second reflecting surface, and a third reflecting surface at least on the side of the objective optical system with respect to an imaging position of an observation image. A fourth reflecting surface formed of a transmissive reflecting surface on the side of the eyepiece optical system, and a photometric unit is disposed on an extension of an optical axis incident on the fourth reflecting surface; A finder device comprising a finder display means provided on an extension of a reflection optical axis of the reflection surface. 2. An illumination device for illuminating the display unit in the finder, wherein the display unit in the finder transmits an illumination light beam from the illumination unit and an illumination light beam of the illumination unit. The finder device according to claim 1, wherein the finder device is formed to have a light-impermeable portion that does not transmit light, and the light-transmitting portion is configured to be observable by the eyepiece optical system as a display in the finder. 3. An objective optical system for forming an observation image, an inversion optical system having a plurality of reflection surfaces for turning the observation image formed by the objective optical system into an erect image, and observing the observation image. A final reflecting surface disposed closest to the eyepiece optical system among the plurality of reflecting surfaces is formed by a light-transmitting reflecting surface; A finder device comprising: a photometric unit disposed on an extension of an optical axis incident on a surface; and a display unit in a finder disposed on an extension of a reflection optical axis of the final reflection surface.