JP2006010782A - Display device for finder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display device for a finder capable of restraining the upsizing of a camera by disposing the illumination member of the display device for the finder at a part other than near an upper part as a display device for a finder in a single lens reflex camera equipped with a finder device comprising a pentaprism or the like. <P>SOLUTION: The display device 20 for the finder has the illumination member 18, the pentaprism 17 and a screen 22 having a screen surface to which a prism for superimposing is applied, and the illumination member is arranged so that illuminating light from the illumination member may be made incident on the screen surface from a side wall surface 17e between the incident surface 17d and the roof surface 17a of the pentaprism. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a finder display device, and more particularly to a finder display device capable of superimposing display on a finder of a single-lens reflex camera.

  2. Description of the Related Art Conventionally, a camera configured to include an automatic focus adjustment mechanism (an autofocus mechanism; hereinafter referred to as an AF mechanism) is widely used as a camera for taking a photograph or the like.

  A display device provided in a viewfinder of a camera equipped with such an AF mechanism, comprising a plurality of distance measurement frames (AF frames), and a distance measurement frame selected from the plurality of distance measurement frames is displayed in the viewfinder field of view. A finder display device that performs so-called superimpose display that is superimposed on a subject image (referred to as a viewfinder field image) within a frame has been put into practical use.

  In a conventional finder display device that can perform such superimpose display, for example, the position at which a desired display is performed is “the position of a range-finding frame that is the target of an automatic focus adjustment operation among a plurality of range-finding frames”. In some cases, the display state is defined so as to represent the “in-focus state” or the “out-of-focus state”, and the display can be superimposed on the viewfinder field image. By performing such a display, the user of the camera can understand the meaning of the display very intuitively and can easily perform a shooting operation with the camera.

  As a display means in the display device of this finder, for example, there is one that uses a light emitting type illumination member such as a light emitting diode (LED) to display a display or non-display state by switching between a lighting state and a light-off state. . A display device that performs such illumination-illuminated superimpose display has an advantage that, for example, since the visibility is high when the display is turned on, the user rarely overlooks the display state. In addition, since various display colors can be selected and used depending on the illumination light source, the display itself can ensure extremely high visibility by performing light emission display even when the subject brightness is low and the viewfinder field frame is dark. There are advantages such as.

  For a camera equipped with a conventional finder display device capable of performing the superimpose display as described above, for example, an assembly of microprisms on a display member made of a reflector provided adjacent to the focusing screen of the camera. By forming a display unit and illuminating the illumination light of the illumination device from an oblique direction, only the light reflected by the minute prism is incident on the finder optical system side. Conventionally, there has been proposed a display device having a display device capable of performing illumination-illuminated superimpose display that can be viewed with a viewfinder.

  The display device of this finder is configured by a display member that can actually be observed through the finder and an illumination device that irradiates the display member with illumination light. Consider the case where the display device of the finder is applied to a camera equipped with a multipoint distance measuring device having a plurality of distance measuring points, for example. In this case, the display device is used to display a distance measurement frame.

  In the case of this multipoint distance measuring device, a plurality of distance measuring parts are scattered in a wide range within the field frame of the finder, and a distance measuring frame serving as a display unit for each of the distance measuring parts. Will be provided. And the illuminating device corresponding to this needs to be able to selectively illuminate the predetermined site | part of the wide range on a display member, ie, the site | part of several ranging frames.

  By the way, in general, the arrangement of the light emitting element for causing the luminous flux from the illumination device to enter the observer's eyeball connects the observer's eyeball with the display unit on the display member when the optical path of the finder is developed. On the extension of the line. For this reason, the position of the light emitting element is further away from the optical axis of the viewfinder as the position of the display unit is further away from the optical axis of the viewfinder. Therefore, in order to arrange the light emitting element (light source) of the lighting device at an appropriate position, a large space is required. For this reason, there is a problem that the camera itself to which this is applied tends to be large.

  In addition to the above-described display devices for finder, various proposals have been made conventionally, for example, by Japanese Patent No. 327271, Japanese Patent Laid-Open No. 2002-268128, and the like.

  The finder display device disclosed in the above-mentioned Japanese Patent No. 327271 is a finder display device in a single-lens reflex camera provided with a finder device made of a pentaprism or the like, as shown in FIG. Illumination members (such as a plurality of light emitting elements 118 and a projection lens 119 that emits the emitted light in a predetermined direction) are arranged in a space above the pentaprism 112 of the finder device, and illumination from the illumination members Light is incident on the inside of the pentaprism 112 from a predetermined surface 112a (an inclined surface facing obliquely upward) of the pentaprism 112. FIG. 8 is a cross-sectional view of an essential part schematically showing the arrangement of the finder display device disclosed in the above publication in the camera.

  In the finder display device of the above publication configured as described above, the illumination light beam emitted from the light emitting element 118 enters the light projecting lens 119, where the optical path O is bent in a predetermined direction. The light enters the predetermined surface 112 a of the pentaprism 112. Thereafter, the same light beam passes through the pentaprism 112 and exits from another predetermined surface 112b. Thereafter, the light passes through the condenser lens 115 and reaches a predetermined display part (predetermined distance measurement frame) among a plurality of display parts (distance measurement frames) on the display member 113 to illuminate it. .

  Thus, by adopting a configuration in which the light emitting elements are efficiently arranged inside the camera, it is possible to realize downsizing of the camera even when a plurality of display units are placed in a wide range in the photographing screen.

  In addition, the finder display device disclosed in Japanese Patent Application Laid-Open No. 2002-268128 is a finder display device for a single-lens reflex camera having a finder device including a hollow pentamirror or the like instead of a glass pentaprism. In the display device, an illumination member is disposed above an opening near the eyepiece optical system in the pentamirror, and light emitted from the light emitting element of the illumination member is provided in the lower portion of the pentamirror through the interior of the pentamirror. The display of the displayed display member is configured to illuminate.

According to this, since a hollow-structured pentamirror is used in place of the glass-made pentaprism, and the illumination member is arranged in the opening of the pentamirror, the space is efficiently used and simple. A finder display device can be configured with a simple structure, and the size of the camera can be reduced.
Japanese Patent No. 3272871 JP 2002-268128 A

  However, according to the means disclosed in the above-mentioned Japanese Patent No. 3272971, since the illumination member of the finder display device is arranged above the pentaprism, the size in the height direction of the camera is increased. In addition to the tendency, there is a problem that the design of the entire camera is restricted.

  In recent years, single-lens reflex cameras equipped with built-in pop-up strobe devices have been widely put into practical use. This pop-up type built-in strobe device is generally arranged near the upper part of the pentaprism.

  However, in order to provide a pop-up type built-in strobe device with respect to the camera having the finder display device configured by means disclosed in the above-mentioned Japanese Patent No. 3272971, a light emitting unit and the like are arranged in the strobe device. There is a problem that the size of the camera itself is increased.

  The present invention has been made in view of the above-described points, and an object of the present invention is a finder display device in a single-lens reflex camera including a finder device made of a pentaprism or the like. It is an object of the present invention to provide a finder display device capable of suppressing the enlargement of the camera by disposing the illumination member of the finder display device in a portion other than the vicinity of the upper portion.

  In order to achieve the above object, a finder display device according to the present invention includes an illumination member, a pentaprism, and a screen having a screen surface provided with a superimposing prism. The illumination member is arranged so that illumination light from the illumination member enters the screen surface from a side wall surface between the surface and the roof surface.

  According to the present invention, there is provided a finder display device in a single-lens reflex camera including a finder device made of a pentaprism or the like, and the illumination member of the finder display device is disposed in a portion other than the vicinity of the upper portion of the finder device. Thus, it is possible to provide a finder display device that can suppress an increase in the size of the camera.

The present invention will be described below with reference to the illustrated embodiments.
FIG. 1 is a perspective view showing a schematic appearance of a camera provided with a finder display device according to an embodiment of the present invention. 2 and 3 are diagrams showing an internal configuration of a camera provided with the finder display device of the present embodiment, and FIG. 2 is a front view showing the arrangement of the finder device and the finder display device inside the camera. It is. FIG. 3 is a side view (sectional view) showing an arrangement of a finder device and a finder display device inside the camera. FIG. 4 is an external perspective view showing only the display member (screen) in the finder display device of the present embodiment. FIG. 5 is a diagram illustrating an example of a viewfinder observation image that can be observed by the viewfinder of the present embodiment. 6 is an enlarged cross-sectional view of a main part showing a part of a cross section (cross section taken along line VV in FIG. 4) of the distance measuring frame in the display member (screen) in FIG.

  As shown in FIG. 1, a camera 1 having a finder display device according to the present embodiment includes an image pickup unit including an electric board, an image pickup device, and the like in which a control circuit that performs overall control of the camera 1 is mounted. And a recording unit for recording image data obtained by the imaging unit and the like, a recording unit for driving the recording medium, a power source battery, and a power source unit for outputting the power to the internal electric circuit of the camera 1. The camera main body 11 and the photographic lens barrel 12 having the photographic optical system 12a and its drive member and the like inside are mainly configured. Here, the taking lens barrel 12 is configured to be detachable from the camera body 11, for example. For this purpose, a lens barrel attachment release operation member 15 is disposed at a predetermined portion on the front side of the camera body 11. The lens barrel attachment release operation member 15 is operated when a photographing lens barrel 12 mounted at a predetermined position on the front surface of the camera body 11 is removed by performing a predetermined operation. It constitutes a part of the mechanism for releasing the mounting state of both.

  On the outer surface of the camera body 11, various operation members, such as a release operation member 13a, a dial operation member 13b, an operation mode switching dial 13c, and the like, a liquid crystal display device 14 for displaying the setting state of the camera 1, etc. It is arranged. Various setting information displayed on the liquid crystal display device 14 is displayed in a predetermined manner in conjunction with operation of various operation members of the camera 1.

  A projecting portion 11a is formed at a substantially middle portion on the upper surface side of the camera body 11 so as to project upward. A finder device 16 (see FIGS. 2 and 3) configured by a later-described pentagonal roof prism (hereinafter simply referred to as a pentaprism) 17 or the like is disposed inside the protruding portion 11a.

  Further, on the outer surface side of the camera body 11, a separate flash light emitting device (not shown in particular) is placed on the rear part of the projecting portion 11 a and connected to the camera body 11. A hot shoe 11b is provided to ensure an electrical connection between an internal electric circuit (not shown) of the camera body 11 and the flash light emitting device.

  As shown in FIGS. 2 and 3, the camera body 11 has a reflection mirror that reflects observation light from a subject incident through the photographing optical system 12 a (see FIG. 1) and guides it toward the viewfinder device 16. 23 is arranged. The reflection mirror 23 is disposed in a state inclined at an angle of approximately 45 degrees (°) with respect to the optical axis O (see FIG. 3) of the photographing optical system 12a. In this case, the reflecting surface 23 a of the reflecting mirror 23 is disposed toward the side of the photographing lens barrel 12 (see FIG. 1) disposed on the front surface of the camera body 11. A viewfinder device 16 is disposed above the reflection mirror 23. Accordingly, the reflection mirror 23 reflects the incident light beam from the subject upward, thereby guiding the light beam to the viewfinder device 16.

  As shown in FIGS. 2 and 3, the finder device 16 constitutes a focusing screen (hereinafter referred to as a focusing screen) 21 for focus adjustment and a part of a finder display device 20 described later. The display member 22 which is a superimpose display screen composed of a plate-like member on which a plurality of distance measuring frames 22a (see FIG. 4) are formed, and the image of the focusing screen 21 (viewfinder field image for observing a subject) are set to the eye level. A pentaprism 17 for allowing an erect image to be observed, and an eyepiece lens 24 (see FIG. 4) for enlarging and displaying a subject image formed by a light beam emitted from the pentaprism 17. ing. A finder window 25 (see FIG. 4) is formed at a predetermined position on the back side of the camera body 11 and at a position facing the eyepiece 24.

  The pentaprism 17 is a bottom surface 17d that is an incident surface on which the reflected light reflected from the reflection mirror 23 is incident, and a pair of roof mirror surfaces that form a roof prism by reflecting a light beam from the bottom surface 17d and is also referred to as a roof surface. The roof reflection surface 17a is formed at a position opposite to the ridge line of the roof reflection surface 17a and is disposed at a predetermined angle with respect to the ridge line, and becomes a reflection surface that reflects the reflected light from the roof reflection surface 17a. A front reflecting surface 17c, an exit surface 17f for emitting reflected light from the front reflecting surface 17c, and a surface formed so as to connect the front portion of the roof reflecting surface 17a and the upper portion of the front reflecting surface 17c. The non-reflective surface 17b and the side wall surface 17e formed on the side of the pentaprism 17 are formed, for example, a glass prism. In this case, for example, aluminum or silver is deposited on the roof reflecting surface 17a and the front reflecting surface 17c.

  Therefore, the light beam incident from the bottom surface 17d of the pentaprism 17 is reflected by the roof reflecting surface 17a and then guided toward the front reflecting surface 17c. The front reflecting surface 17c receives this and reflects it toward the eyepiece 24 side from the exit surface 17f. As a result, the luminous flux is guided from the bottom surface 17d toward the eyepiece lens 24 and is emitted from the finder window 25. An observer can observe a finder field image by putting his eyes on the finder window 25.

  Each side wall surface 17e of the pentaprism 17 is joined (adhered) with a sub-prism 27 for making an illumination light beam, which will be described later, enter the pentaprism 17 and emit downward from the bottom surface 17d of the pentaprism 17. For this purpose, the sub-prism 27 has an illumination light beam incident surface (hereinafter simply referred to as an incident surface) 27a formed of an inclined surface directed outward at a predetermined angle with respect to both side wall surfaces 17e of the pentaprism 17. Is formed. An illumination light beam from a light emitting element 18 (LED; illumination member), which will be described later, is made incident from the incident surface 27a.

  That is, when the illumination light beam is directly incident on the side surface of the pentaprism 17 without the sub prism 27 being disposed, the illumination light beam is totally reflected on the bottom surface 17d of the pentaprism 17. Resulting in. Accordingly, it is impossible to irradiate the illumination light beam toward the display member 22 described later. Therefore, in the present embodiment, the secondary prism 27 is joined to the pentaprism 17, and the illumination light beam is incident on the pentaprism 17 from the side of the pentaprism 17 via the subprism 27. The light can be emitted downward from the bottom surface 17d.

  A finder display device (hereinafter simply referred to as a display device) 20 is disposed in the vicinity of the pentaprism 17. The display device 20 receives, for example, a light emitting element 18 as an illumination member such as a light emitting diode (LED) and an illumination light beam generated from the light emitting element 18, and guides and emits the light beam toward a predetermined part. The projection prism 19 which is a prism to be operated, the display member 22 and the like. Note that a plurality of light emitting elements 18 and light projecting prisms 19 (three in each embodiment) are provided, and each pair functions.

  The light projecting prism 19 is made of, for example, a plastic material such as acrylic, and has a shape that can be emitted in a predetermined direction by changing the traveling direction of the incident light beam. Thereby, the illumination light flux of the light emitting element 18 can be guided in a desired direction.

  For this purpose, a mask member 19a having an opening having a predetermined size is disposed on the surface (incident surface) of the light projecting prism 19 facing the light emitting element 18. The mask member 19 a serves as a diaphragm when the illumination light beam generated from the light emitting element 18 enters the light projecting prism 19.

  Further, the surface of the reflecting surface 19b for reflecting the illumination light beam of the light projecting prism 19 in a predetermined direction is subjected to a surface treatment for improving the reflectance such as aluminum vapor deposition. By performing this surface treatment, the light beam incident on the light projecting prism 19 is reflected, the traveling direction thereof is changed, and the light beam is guided in a desired direction.

  The light exit surface of the light projecting prism 19 is formed to have a convex shape toward the outside, for example. Accordingly, the light projecting prism 19 can illuminate only a necessary portion with a light beam having an irradiation area equivalent to the opening shape of the mask member 19a.

  The light projecting prism 19 is disposed so that the light exit surface thereof faces the incident surface 27a of the sub prism 27 described above.

  As shown in FIG. 4, the display member 22 is formed of a flat plate member such as a plastic material such as acrylic. A plurality of (three in the present embodiment) display portions, that is, distance measuring frames 22a are formed at predetermined portions on the surface of the display member 22.

  As described above, the display member 22 is a screen for superimposing. That is, the display member 22 is disposed in a space between the incident surface 17 d of the pentaprism 17 and the reflection mirror 23. The display member 22 has a screen surface disposed so as to face the incident surface 17 d of the pentaprism 17. As a result, the display member 22 receives the illumination light from the light emitting element 18 (illumination member) on the screen surface, and then reflects it to the side of the pentaprism 17 so that the emission surface 17f of the pentaprism 17 is finally obtained. It has come to lead to.

  In the display device 20 of the present embodiment, the light projecting prism 19 and the light emitting element 18 are configured to have the same number (three each) corresponding to the number of distance measuring frames 22a (three in the present embodiment). ing.

  Therefore, in the display device 20 of the present embodiment having such a configuration, the illumination light beam generated from the predetermined light emitting element 18 is reduced to a predetermined amount by the opening of the mask member 19a of the light projecting prism 19 corresponding thereto. The light enters the projection prism 19.

  Then, the illumination light beam is repeatedly reflected a predetermined number of times by the internal reflection surface of the light projecting prism 19, then guided to the light emission surface of the light projection prism 19, and emitted from here to the outside.

  The illumination light beam emitted from the exit surface of the light projecting prism 19 passes through the sub prism 27 and the penta prism 17 and then exits downward from the bottom surface 17 d of the penta prism 17. Thus, the illumination light beam is emitted from any one of a plurality of display units (predetermined distance measuring frame 22a) formed on the surface (screen surface) of the display member (also referred to as a screen) 22. The distance measuring frame 22a located at a position corresponding to the projection prism 19 is illuminated.

  In this state, a viewfinder field image that can be observed by the viewfinder device 16 is, for example, as shown in FIG. In the example shown in FIG. 5, the finder observation screen 30 in a state where projection is performed by the illumination light flux of the light emitting element 18 on the central distance measuring frame 22a among the three distance measuring frames 22a shown in FIG. It is.

  In the state shown in FIG. 5, the part on the finder observation screen 30 corresponding to the center distance measuring frame 22a shown in FIG.

  Here, the display principle of the illumination type superimpose display by the display device 20 including the illumination member (light emitting element 18) and the display member 22 will be described in detail below with reference to FIGS.

  The distance measuring frame 22a (see FIG. 4) formed on the screen surface of the display member 22 is formed by a number of fine prisms provided for superimpose display. The cross-sectional shape is a collection of triangular protrusions each having one ridge line as shown in FIG.

  For this purpose, the luminous flux that passes through the photographing optical system 12a (see FIG. 1), is reflected upward by the reflecting mirror 23, and then passes through the focusing screen 21 and enters the distance measuring frame 22a of the display member 22, is measured by this measurement. Since the light is refracted by the prism of the distance frame 22a, it is separated from the pentaprism 17 side (the eyepiece lens 24). Therefore, from this, in a normal case, the portion of the distance measuring frame 22a is visually recognized darker than the surrounding portion.

  On the other hand, the illumination light beam from the display device 20 provided obliquely above the display member 22 is emitted from the side wall surface 17e of the pentaprism 17 toward a predetermined distance measuring frame 22a on the surface of the display member 22 (FIG. 6). In this case, after entering the display member 22, the light beam L is totally reflected on one inclined surface 22aa of the prism of the distance measuring frame 22a. Thereafter, the light is incident on the other inclined surface 22ab opposite to the inclined surface 22aa, and is totally reflected here and goes upward (see L1 in FIG. 6). Therefore, this light beam is guided to the eyepiece lens 24 side through the pentaprism 17, and is visually recognized by the user in a form superimposed on the viewfinder field image.

  On the other hand, of the illumination light flux from the display device 20, the light flux that does not enter the prism of the distance measuring frame 22 a passes through the focusing screen 21 and then exits in the direction of the reflection mirror 23 (see reference numeral L <b> 2 in FIG. 6). Therefore, this illumination light beam is not visually recognized by the user who observes the viewfinder field image from the viewfinder window side.

  As described above, the distance measuring frame 22a formed by a plurality of fine prisms has a characteristic of receiving an illumination light beam from the display device 20 provided obliquely above and deflecting it upward. .

  Therefore, if the light emitting element 18 serving as a light source is arranged on the optical path from the user's eyeball to each of the distance measuring frames 22a to the display device 20, the distance measuring frame 22a functions as an illumination light beam emitted from the light emitting element 18. Thus, the user can visually recognize the distance measuring frame 22a in a lighting state.

  In the display device 20 of this embodiment configured as described above, when, for example, a red light emitting diode (LED) is used as the light emitting element 18 of the display device 20, the focus state is obtained at the position of a certain distance measuring frame 22a. When the light emitting element 18 corresponding to the distance measuring frame 22a is turned on at this time, the distance measuring frame 22a that is normally viewed in black is displayed in red simultaneously with the lighting of the light emitting element 18. This red display is displayed superimposed on the viewfinder field image. By visually recognizing this, the user can confirm the position in the in-focus state in the viewfinder field image in the camera 1 in use by red display.

  Thus, in the display device 20 of the present embodiment, a plurality of distance measurement frames 22a are provided by performing light emission control of the light emitting element 18 while utilizing the characteristics obtained by the configuration of the distance measurement frame 22a provided on the display member 22. The lighting display and display color of the desired distance measuring frame 22a can be controlled.

  In addition to the above example, when a reflective surface is formed by vapor deposition on the focusing screen 21, it can be used as a display member having the same function.

  As described above, according to the above-described embodiment, in the camera 1 including the finder device 16 configured by using the pentaprism 17, the pentaprism 17 of the finder device 16 disposed inside the camera body 11. A light emitting element 18 (illuminating member) and a light projecting prism 19 are arranged in the vicinity of both side surfaces, that is, in the vicinity of the side wall surface 17e between the roof reflecting surface 17a and the bottom surface 17d of the pentaprism 17, and the light emitting element 18 projects light. A display device 20 of the finder is configured by a display member 22 that is arranged on the optical path of the illumination light beam emitted through the prism 19 and reflects a part of the incident light beam toward the finder device 16 side.

  And the light emitting element 18 is arrange | positioned so that the illumination light from the light emitting element 18 may inject toward the screen surface of the display member 22 (screen).

  With such a configuration, it is possible to realize superimpose display in which a predetermined distance measuring frame 22a is superimposed on the viewfinder field image and can be visually recognized by the action of the illumination light beam from the light emitting element 18. .

  In this case, the arrangement of various members constituting the display device 20 is arranged so that the light emitting element 18 (illumination member) and the like are arranged in the vicinity of the side wall surface 17e of the pentaprism 17 so that the arrangement of the various members is accommodated in the camera body 11. Therefore, it is possible to suppress an increase in the size of the camera 1 itself and to increase the degree of freedom of restrictions on the appearance design.

  In addition, it is possible to easily arrange a relatively large member in the space above the pentaprism 17 for other purposes, for example, a flash light emitting part of a pop-up type built-in strobe device, while avoiding an increase in the size of the camera 1 itself. .

  FIG. 7 is a view showing a modification of the above-described embodiment, and is a side view showing the arrangement of the finder display device inside the camera. This modification is an example when the finder display device of the present invention is applied to a camera having a pop-up type built-in strobe device. In FIG. 7, a state in which the pop-up type built-in strobe device is housed inside the camera body is shown as a normal state by a solid line, and a state in which the built-in strobe device pops up is shown by a two-dot chain line (imaginary line).

  In this modification, the camera 1 (see FIG. 3) to which the finder display device 20 of the above-described embodiment is applied is further provided with a pop-up type built-in strobe device 31.

  As shown in FIG. 7, in the camera 1 </ b> A of this example, a pop-up type built-in strobe device (hereinafter simply referred to as a built-in strobe device) 31 is a protrusion 11 a provided at a substantially middle portion on the upper surface side of the camera body 11. It is arrange | positioned in the vicinity. The built-in strobe device 31 is pivotable within a predetermined range in a direction indicated by an arrow R in FIG. 7 with a shaft portion 31b fixed at one end to a fixing member (not shown) inside the camera body 11 as a rotation center. It is supported. In this case, the rotation range of the built-in strobe device 31 is between a housed state (non-use state) indicated by a solid line in FIG. 7 and a pop-up state (use state) indicated by a two-dot chain line in FIG. .

  As shown in FIG. 7, when the built-in strobe device 31 is in the housed state, the flash light emitting part 31 a is housed and arranged in the space above the pentaprism 17. Other configurations are the same as those of the above-described embodiment. Therefore, about the structure substantially the same as one Embodiment mentioned above, the same code | symbol is attached | subjected and the detailed description is abbreviate | omitted.

  As shown in this modification, the finder display device of the present invention can be easily applied to a camera 1A equipped with a pop-up type built-in strobe device without increasing the size of the camera itself.

  In the above-described embodiment and its modification, the superimposing screen (display member 22) and the focusing screen (focus plate 21) are configured as separate members. It is good also as a structure which integrated.

  In the above-described embodiment and its modification, the illumination member (light-emitting element 18) is configured with a total of three points, with one side of the pentaprism 17 arranged on one side and one side of the other side. An example is shown, but the present invention is not limited to this. For example, it is easy to make a further multipoint configuration, for example, one side has 3 points and the other side has 2 points. Can be.

  Furthermore, in the above-described embodiment and its modification, the sub-prism 27 is joined (adhered) to the side wall surface 17e of the pentaprism 17 in order to match the incident angle of the illumination light beam to the pentaprism 17. However, the present invention is not limited to this, and for example, it is also conceivable that the roof reflecting surface 17a of the pentaprism 17 is extended downward and the extended portion becomes the incident surface of the illumination light beam.

[Appendix]
According to the embodiment of the above invention, an invention having the following configuration can be obtained.

(1) In a finder display device,
A reflection mirror that reflects observation light from the subject;
A screen having a screen surface provided with a prism for superimposing;
The incident surface on which the reflected light reflected from the reflecting mirror is incident, the roof mirror surface that reflects the light beam from the incident surface, the reflective surface that reflects the reflected light from the roof mirror surface, and the reflected light from the reflective surface A pentaprism having an exit surface for emitting
An illumination member that is formed between the roof mirror surface of the pentaprism and the incident surface, and that makes illumination light incident on the screen from a side wall surface on the side of the pentaprism;
A finder display device comprising

(2) In the finder display device described in appendix (1),
The superimposing screen is a space between the incident surface of the pentaprism and the reflection mirror for guiding the illumination light from the illumination member to the exit surface of the pentaprism, and The screen surface is arranged to face the surface.

1 is a perspective view illustrating a schematic appearance of a camera including a finder display device according to an embodiment of the present invention. The front view which shows arrangement | positioning of the display apparatus of the finder inside the camera of FIG. FIG. 2 is a side view (sectional view) illustrating an arrangement of a display device of a finder inside the camera of FIG. 1. FIG. 2 is an external perspective view showing only a display member of a finder display device in the camera of FIG. 1. The figure which shows the example of the finder observation image which can be observed with the finder in the camera of FIG. The principal part expanded sectional view which expands and shows a part of the cross section (cross section which follows the VV line of FIG. 4) of the ranging frame in the display member of FIG. The side view which shows the modification of one Embodiment of this invention and shows arrangement | positioning of the display apparatus of the finder inside a camera. The figure which shows the conventional form of the display apparatus of the finder which can perform a superimpose display in the conventional single-lens reflex camera provided with the finder apparatus which consists of penta prisms.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,1A ... Camera 11 ... Camera body 11a ... Projection part 11b ... Hot shoe 12 ... Shooting lens barrel 12a ... Shooting optical system 13a ... Release operation member 13b ... Dial operation member 13c ... Operation mode switching dial 14 ... Liquid crystal display device 15 ... Lens barrel attachment release operation member 16 ... Viewfinder device 17 ... Penta prism 17a ... Dach reflection surface 17b ... Non-reflection surface 17c ... Front reflection surface 17d ... ... bottom surface 17e ... side wall surface 18 ... light emitting element 19 ... projection prism 19a ... mask member 20 ... display device 21 ... focal plate 22 ... display member 22a ... ranging frame 23 ... reflection mirror 23a …… Reflecting surface 24 …… Ocular lens 27 …… Sub prism 27a …… Incoming surface 31 …… Built-in strobe device 31a …… Flash light emitting portion 31b …… Shaft portion 112 ... pentaprism 113 ...... display member 115 ...... condenser lens 118 ...... emitting element 119 ...... light projecting lens Attorney Attorney Susumu Ito

Claims (3)

In the viewfinder display device,
A lighting member;
Penta prism,
A screen having a screen surface provided with a prism for superimposing;
Have
A display device for a finder, wherein the illumination member is arranged so that illumination light from the illumination member is incident on the screen surface from a side wall surface between an incident surface and a roof surface of the pentaprism. In the viewfinder display device,
A reflection mirror that reflects observation light from the subject;
A screen having a screen surface provided with a prism for superimposing;
The incident surface on which the reflected light reflected from the reflecting mirror is incident, the roof mirror surface that reflects the light beam from the incident surface, the reflective surface that reflects the reflected light from the roof mirror surface, and the reflected light from the reflective surface A pentaprism having an exit surface for emitting
An illumination member that is formed between the roof mirror surface of the pentaprism and the incident surface, and that makes illumination light incident on the screen from a side wall surface on the side of the pentaprism;
A display device for a finder, comprising: In the finder display device according to claim 1 or 2,
A finder display device comprising a prism for guiding illumination light from the illumination member to the wall surface.

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