JP2004102318A - Camera - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a camera with a superimposing display function which can improve the visibility in its finder visual field. <P>SOLUTION: The camera which irradiates a focus detection area selected out of a plurality of focus detection areas with illumination light and makes a superimposing display of the focus detection area in the finder visual field is characterized in that the focus detection areas consist of frame line areas 3a to 3g which form their external frames and transmit part of subject luminous flux and reflection areas 3h to 3n which are provided inside the frame line areas 3a to 3g and reflect the illumination light to guide it to the eye of a photographer. <P>COPYRIGHT: (C)2004,JPO

Description

The present invention relates to a camera having a superimpose display function for displaying a focus detection area selected from a plurality of focus detection areas provided in a viewfinder field of view.

Conventionally, cameras having a superimposed display function are known (for example, see Patent Documents 1 and 2). In such a conventional camera, a light flux from an illuminating unit arranged in front of a pentaprism is reflected by a quick return mirror constituted by a half mirror via a light projecting lens, and a plurality of display units arranged on a focusing screen. The part is illuminated.

Further, there is a display observing apparatus in which an illuminating means is provided on the forehead of a pentaprism, and illumination light from the illuminating means is transmitted through the pentaprism to irradiate a display provided on a focusing screen (for example, Patent Document 3).

Further, there is an optical device in which a distance measuring point display unit corresponding to a distance measuring point is provided in an information display unit in a finder for displaying a shutter speed and an aperture value (for example, see Patent Document 4).
JP-A-1-277225 JP-A-5-333259 JP-A-4-278931 JP-A-10-048733

However, in the cameras described in Patent Documents 1 and 2 described above, the optical path from the illumination means to the focusing screen is long, and the light beam from the illumination means is repeatedly refracted and reflected many times by the projection lens, the main mirror, and the like. Since the mirror is composed of a half mirror, the light guide efficiency is considerably poor.

In addition, in the above-described camera, a space for arranging a light projecting lens and the like is required, and an operation of adjusting a light flux emitted from the illumination unit is required, which results in an increase in size, cost, and productivity of the camera. I will.

On the other hand, when the entire focus detection frame is illuminated with LED light, there is no problem in photographing in a bright place, but in photographing in a dark place, the part illuminated by the LED light has a large effect in the finder field of view, so the photographer looks into the finder. For the photographer, the display in the viewfinder may look annoying.

In the display observing device disclosed in Patent Document 3, since the focusing screen is illuminated by transmitting the light through the pentaprism, the optical path is shortened and the light guide efficiency is improved. Therefore, it is difficult to arrange a built-in flash light emitting device on the frontal part of the pentaprism.

In addition, since the display on the focusing screen is a mirror surface and does not transmit the subject light, when the observer looks into the viewfinder, the portion of the subject image corresponding to the display is blacked out. Will be done. For example, when the display on the focusing screen is formed in a shape such as a double line or a cross, the subject image becomes difficult to see according to the shape of the display.

In the optical device disclosed in Patent Document 4, a distance measuring point display unit corresponding to a distance measuring point is provided in an existing finder information display unit for displaying a shutter speed and an aperture value outside the finder field of view. The selected ranging point can be displayed. However, since the display position is distant from the actual distance measurement point displayed in the finder visual field, the visibility of the distance measurement point cannot be said to be good.

Therefore, the present invention solves the above-mentioned problems, and achieves low cost, miniaturization, improvement of productivity by eliminating the need for adjustment of illumination light, and superimposition with good visibility without giving a photographer an uncomfortable feeling. It is intended to be realized.

A first invention of the present application is directed to a camera that irradiates illumination light to a focus detection area selected from a plurality of focus detection areas and superimposes and displays the focus detection area in a finder visual field. A frame region that forms this outer frame and transmits a part of the subject light beam, and a reflection region provided inside the frame line region and reflecting illumination light to guide the eyes of the photographer. It is characterized by comprising.

In other words, the visibility is improved in the viewfinder visual field by reflecting the illumination light in the reflection area provided in the focus detection area (in the area surrounded by the frame area) and guiding it to the eyes of the photographer. I try to make it.

Specifically, when the selected focus detection area is superimposed and displayed, only the reflection area is turned on with high brightness so that the photographer can recognize the selected focus detection area. When the subject image is observed in a normal state without superimposed display, only the reflection area is blacked out to prevent the subject image from being difficult to see.

A second invention of the present application is directed to a camera that irradiates illumination light to a focus detection area selected from a plurality of focus detection areas and superimposes and displays the focus detection area in a finder visual field. Is formed of a frame region that forms the outer frame and transmits a part of the subject light beam, and a reflection region that reflects the illumination light and guides the photographer's eyes. The portion is cut out, and a reflection area is provided in the cut-out area. Also in the present invention, the same effect as that of the first invention of the present application can be obtained.

Here, the surface of the reflection area may be subjected to a reflective deposition process to reflect the illumination light. In addition, the region subjected to the reflection deposition processing can be formed in a substantially circular shape, or the diameter of this region can be made smaller than 0.2 mm.

According to the present invention, the illumination light is reflected by the reflection area provided in the focus detection area (the area surrounded by the frame line area) and guided to the photographer's eyes, so that the finder visual field is reduced. The visibility is improved.

Specifically, when the selected focus detection area is superimposed and displayed, the photographer can be made to recognize the selected focus detection area by lighting only the reflection area with high luminance. Further, when the subject image is observed in a normal state without superimposed display, only the reflection area is blacked out to prevent the subject image from being difficult to see.

Hereinafter, embodiments of the present invention will be described.

Hereinafter, a camera that is Embodiment 1 of the present invention will be described with reference to the drawings and the like.

FIG. 1 is a central longitudinal sectional view of the camera in this embodiment. The subject light L passing through a not-shown photographing optical system (imaging optical system) is reflected by the main mirror 2 when the main mirror (half mirror) 2 is at the observation position (mirror down position) as shown in FIG. Is guided to the finder optical system. On the other hand, when the main mirror 2 is retracted from the photographing optical path, the subject light L passes through the focal plane shutter (shutter) 7 and then forms an image on the film F.

The focusing screen 3 is arranged on a predetermined image forming plane of the photographing optical system. The upper surface of the focusing screen 3 is formed of a matte surface 3a, on which a subject image is projected. The lower side of the focusing screen 3 is constituted by a Fresnel surface 3b for condensing subject light. Note that seven focus detection areas are formed on the focusing screen 3 as described later.

The hollow pentagon 4 and the third reflection mirror 5 change the subject image projected on the focusing screen 3 into an erect image and guide the image to the eyepiece lens group 6. The photographer can observe the subject image via the eyepiece lens group 6.

公 知 A known photometric lens 8 and a photometric sensor 9 for measuring the luminance of the subject are arranged above the eyepiece lens group 6. Below the eyepiece group 6, an LCD 10 for displaying information in the viewfinder for displaying photographing information outside the field of view of the viewfinder, an LED 11 for displaying information in the viewfinder, and a triangular prism for guiding light transmitted through the LCD 10 to the viewfinder. 12 are arranged.

(2) An illumination mechanism for displaying a superimposed image is disposed between the hollow pentagon 4 and the photometric lens 8, and details thereof will be described later with reference to FIGS.

There is a sub-mirror 13 behind the main mirror 2, and this sub-mirror 13 reflects a light beam transmitted through the main mirror 2 toward a focus detection device 15 arranged below the camera body 1. The focus detection device 15 includes a field lens 15a, a reflection mirror 15b, an aperture 15c, a secondary imaging lens 15d, and an AF sensor 15f arranged near the imaging plane.

The focus detection device 15 in the present embodiment detects the focus adjustment state by using a known phase difference detection method, and as shown in FIG. 4, divides a plurality of regions (seven places) in the observation screen (in the finder field). It is a focus detection area.

The accessory shoe 17 is provided directly above the lens optical axis on the upper surface of the camera body 1, and a camera accessory such as an external flash light emitting device can be attached to the accessory shoe 17. By mounting an external flash device on the accessory shoe 17, the camera body 1 can communicate with the flash device.

The light emitting section 20 of the flash light emitting device provided in the camera body 1 includes a Xe tube 20a for converting electric energy into light energy, and a reflector 20b for efficiently condensing the light emitted from the Xe tube 20a on the subject side. And a panel 20c, and a trigger coil 20d for applying a voltage for starting light emission to the Xe tube 20a.

The light emitting unit 20 of the flash light emitting device is housed in the forehead of the hollow pentagon 4 as shown in FIG. 1 when not in use, and clockwise in FIG. By rotating, it pops up above the camera body 1.

FIG. 2 is an exploded perspective view of a lighting mechanism for superimposed display in the present embodiment. The LED 30 for superimpose illumination includes seven chip type LEDs (LED-C_30a, LED-L1_30b, LED-L2_30c, LED-R1_30d provided corresponding to the seven focus detection areas formed on the focusing screen 3). , LED-R2_30e, LED-T_30f, and LED-B_30g).

The diffusion plate 31 has a function of diffusing the illumination light from the LED 30 for superimposed illumination, expanding the illumination range, and making the shadow of the wire bonding formed in the manufacture of the LED 30 difficult to see when illuminating. I do. The aperture 32 prevents ghost from being generated by unnecessary illumination light from the LED 30 for superimposed illumination.

The prism 33 for superimposition has a reflective surface 33a subjected to a reflective vapor deposition process. The reflective surface 33a reflects the illumination light from the LED 30 and guides the illumination light from the opening 4a of the hollow pentameter 4 into the hollow pentameter 4. ing. Then, the illumination lights of the LEDs 30a to 30g are applied to the respective focus detection areas formed on the focusing screen 3.

The illumination light from the LED 30 is applied to the hollow pentagon 4 from the back side of the camera body 1 as shown in FIG. It is supposed to be. With such a configuration, the light path of the illumination light of the LED 30 is shortened, so that the light guide efficiency is improved.

FIG. 3 is a perspective view showing how illumination light from the LED 30 for superimpose illumination actually illuminates each focus detection frame portion of the focusing screen 3. In the figure, the hollow pentagon 4 and the third reflection mirror 5 are shown as cross sections cut at their centers. The lower side of the figure shows an enlarged view of the central focus detection frame 3a formed at the center of the focusing screen 3.

に お い て In the figure, the LED-C_30a illuminates the vicinity of the central focus detection frame 3a. Similarly, LED-L1_30b is near the left middle focus detection frame 3b, LED-L2_30c is near the left focus detection frame 3c, LED-R1_30d is near the right middle focus detection frame 3d, and LED-R2_30e is right focus detection frame 3e. LED-T_30f illuminates the vicinity of the upper focus detection frame 3f, and LED-B_30g illuminates the vicinity of the lower focus detection frame 3g.

Here, the illumination lights of the LEDs 30a to 30g irradiate the focus detection frames 3a to 3g so as to substantially cover or cover the entire focus detection frames so as to compensate for deviations due to manufacturing tolerances.

The illumination light of the LEDs 30a to 30g is provided at the center of each of the focus detection frames 3a, 3b, 3c, 3d, 3e, 3f, and 3g, and is an area smaller than the area surrounded by each of the focus detection frames 3a to 3g. The light is reflected by the reflection areas 3h, 3i, 3j, 3k, 31, 3m, and 3n. This reflected light is observed via the hollow pentagon 4, the third reflection mirror 5, and the eyepiece lens group 6.

Here, the LED 30 basically only needs to illuminate the small-area reflection regions 3h to 3n provided in the focus detection frames 3a to 3g, and the light path of the illumination light of the LED 30 is short as described above. Therefore, it is possible to reduce the size of the illumination system (eg, the LED 30). Further, by providing the reflection areas 3h to 3n at the center of the focus detection frames 3a to 3g, the reflection areas 3h to 3n can be surely illuminated even if the illumination light from the LED 30 is slightly shifted. There is no need to make adjustments.

As can be seen from the enlarged view shown in the lower part of FIG. 3, the reflection area 3h provided at the center of the center focus detection frame 3a transmits the illumination light of the LED 30a for superimposed illumination to the hollow pentagon 4 and the third The light is reflected so as to be guided to the eyes of the photographer via the reflection mirror 5. The reflection area 3h is composed of an aggregate of a plurality of minute reflection surfaces 3hS formed in the same shape, and the minute reflection surface 3hS is formed at a predetermined angle with respect to the surface of the focusing screen 3. .

Here, when the entire reflection area is formed by one surface, the reflection area must be formed at a predetermined angle as described above, and in this case, the height difference becomes large at both ends of the reflection area. In addition, the reflection deposition process becomes non-uniform, and uneven brightness occurs.

Therefore, the influence of the above-described height difference is reduced by configuring one reflection region as an aggregate of fine reflection surfaces having the same reflection angle as in the present embodiment. Here, the angle of inclination of each fine reflection surface formed at the center of each focus detection frame with respect to the focusing screen 3 is set to an optimum angle so that the photographer can see the light reflected by the fine reflection surface well. Is set.

Also, the prism ridges of the focus detection frames 3a to 3g are formed so as to be substantially parallel to the illumination light of the LED 30, so that reflected light components are not generated in the focus detection frames 3a to 3g with respect to the illumination light from the LED 30. Have been. Thus, even when the subject light has low luminance (when the observation environment is dark), the entire focus detection frame does not emit light, and only the reflection areas 3h to 3n arranged at the center of the focus detection frames 3a to 3g emit light. By increasing the number of reflected light components as in the prior art, the inside of the finder does not feel troublesome.

FIG. 4 shows how the LED 30 for superimpose illumination illuminates each focus detection frame of the focusing screen 3 as in FIG. The lower part of the figure shows an enlarged left focus detection frame 3c located on the left (because the hollow pentagon 4 turns right and left to form a normal image) from the photographer who looks through the viewfinder. . In FIG. 4, the same members as those in FIG. 3 are denoted by the same reference numerals.

As can be seen from the enlarged view shown in the lower part of FIG. 4, the reflection area 3j provided in the center of the left focus detection frame 3c transmits the illumination light of the LED 30c for superimposed illumination to the hollow pentameter 4 and the third reflection area. The light is reflected through the mirror 5 so as to be guided to the eyes of the photographer. The reflection area 3j is composed of an aggregate of a plurality of fine reflection surfaces formed in the same shape as the reflection area 3h, and the fine reflection surface is formed at a predetermined angle with respect to the surface of the focusing screen 3. Have been.

However, the reflection area 3j of the left focus detection frame 3c is different from the reflection area 3h of the center focus detection frame 3a, and is inclined by an angle θ with respect to the longitudinal direction of the left focus detection frame 3c. Then, the illumination light of the LED 30c for superimposed illumination and the longitudinal direction of the fine reflecting surface are substantially orthogonal to each other.

This is because the fine reflection surfaces in the reflection areas of the focus detection frames existing on the left and right with respect to the finder optical axis (center focus detection frame 3a) are arranged in a horizontal and vertical arrangement like the reflection area 3h of the center focus detection frame 3a. When trying to do so, it is necessary to incline in two axes in order to guide the illumination light of the LED 30 to the eyes of the photographer. When tilted in two axes in this way, the shape of the reflection surface in the reflection area becomes irregular, and the size of the reflection area changes depending on the position of the focus detection frame, resulting in uneven brightness.

In order to prevent this, in the present embodiment, the reflection area of each focus detection frame existing on the left and right with respect to the finder optical axis (center focus detection frame 3a) is set at a predetermined angle θ with respect to the longitudinal direction of the focus detection frame. Just leaning. Thus, the illumination light of the LED 30 can be accurately guided to the eyes of the photographer only by changing the tilt of one axis to the optimum angle, and the size of the reflection area of each focus detection frame is prevented from being varied. can do.

FIG. 5 is a viewfinder screen of the camera of this embodiment. In the finder screen, seven focus detection frames 3a, 3b, 3c, 3d, 3e, 3f, 3g corresponding to the focus detection areas of the focus detection device 15 are displayed.

Since the photographer sees the focus detection frames 3a to 3g on the focusing screen 3 via the hollow pentagon 4 and the third reflection mirror 5, the focus detection frames 3a to 3g observed on the finder screen are shown in FIG. The position of the focus detection frames 3a to 3g in FIG.

The illumination light from the LED 30 for superimpose illumination covers the reflection areas 3h, 3i, 3j, 3k, 31, 3, 3m, and 3n in each focus detection frame so as to cover these areas, and The light is projected with a light flux that does not illuminate the reflection area of the focus detection frames arranged around one focus detection frame.

This prism ridge line is positioned on the optical axis of the illumination light of the LED 30 so that the prism constituting the focus detection frames 3a to 3g does not light up insignificantly due to excess light in the illumination light from the LED 30 for superimposed illumination. It is formed so as to be substantially parallel with respect to.

Here, since the prisms of the focus detection frames 3a to 3g transmit a part of the subject light L, the subject light L that has passed through this prism passes through the mat portion of the focusing screen 3 around the focus detection frame. It is observed by the photographer as a darker translucent state. Thus, the photographer can determine the focus detection frames 3a to 3g on the finder screen.

On the other hand, the surfaces of the reflection areas 3h to 3n provided at the center of each of the focus detection frames 3a to 3g are subjected to a reflection deposition process using a metal such as aluminum or chromium. Therefore, in the reflection areas 3h to 3n, the subject light L is hardly transmitted. Therefore, the reflection areas 3h to 3n are recognized as black points in the viewfinder screen.

As a result, when the photographer looks at the normal subject image without superimposed display by looking through the viewfinder, only the reflection areas 3h to 3n are recognized as black points as described above. In this way, the subject image is not difficult to see.

When reflecting the illumination light from the LED 30, the reflection areas 3h to 3n need to be easily recognizable to a photographer looking through the finder, and the photographer observes the subject image in a normal state. Sometimes, it is necessary that the reflection areas 3h to 3n do not hinder the observation. Therefore, the size of the reflection regions 3h to 3n needs to satisfy the above-described conditions. Specifically, it is preferable that the size of the reflection regions 3h to 3n be less than φ0.2 mm.

In FIG. 5, below the viewfinder screen, there is a viewfinder information display section for displaying information necessary for shooting, such as shutter speed, aperture, and charging completion display of the flash light emitting device.

FIG. 6 is a diagram in which only seven reflection areas 3h to 3n at the center of each of the focus detection frames 3a to 3g are extracted and displayed.

微細 In each of the reflection regions 3h to 3n, fine reflection surfaces of 40 μm in width and 25 μm in length are arranged in a staggered manner so that a circle less than φ0.2 mm can be accommodated. Each of the reflective areas 3h to 3n is subjected to a metal reflective vapor deposition process in the circular areas 3o, 3p, 3q, 3r, 3s, 3t, and 3u (indicated by oblique lines in the drawing) that fall within the reflective areas.

(4) When the illumination light from the LED 30 irradiates the reflection areas 3h to 3n, the illumination light is reflected in the circular areas 3o to 3u subjected to the reflection deposition processing.

The reason why the area where the reflective vapor deposition processing is performed is circular is as follows. That is, as described with reference to FIG. 4, in the focus detection frames located on the left and right with respect to the finder optical axis (center focus detection frame 3a), this reflection region is formed at a predetermined angle θ with respect to the longitudinal direction of the focus detection frame. Since they are arranged to be inclined, they are circular in order to minimize variations in the shape of the reflecting surface in each of the reflecting areas 3h to 3n.

In addition, the regions 3o to 3u are subjected to a vapor deposition process. At this time, the vapor deposition wraps around the mask. Therefore, in order to minimize the disturbance of the shape of the vapor deposition region, the vapor deposition region is formed to have a substantially circular shape. This is because it is preferable to do so.

On the other hand, by making the area of the circular regions 3o to 3u slightly smaller than the area of the reflection regions 3h to 3n, it is possible to tolerate the positional deviation of the evaporation regions when performing the vapor deposition work on the reflection regions 3h to 3n. .

FIG. 7 is an enlarged longitudinal sectional view of the reflection area 3h. The reflection region 3h is formed as an aggregate of the fine reflection surfaces 3hS having the same shape as described above. The inclined surface 3hR inclined with respect to the surface of the focusing screen 3 is an actual reflecting surface, and the inclination angle of the inclined surface 3hR is determined by the luminous flux projected from the LED 30 for superimposed illumination guiding the eyes of the photographer. It is formed at such an angle that it can slip.

In this embodiment, the reflection areas 3h to 3n are arranged at the center of the focus detection frames 3a to 3g, but may be provided at any position in the focus detection frames 3a to 3g.

Second Embodiment A camera that is a second embodiment of the present invention will be described.

FIG. 8 shows how the illumination light from the LED 39 for superimpose illumination actually illuminates each focus detection frame portion of the focusing screen 40 in the camera of the present embodiment. In the figure, the hollow pentagon 4 and the third reflection mirror 5 are shown as cross sections cut at their centers. The lower part of the figure shows an enlarged view of the central focus detection frame 40a formed at the center of the focusing screen 40.

に お い て In the figure, the LED-C_39a illuminates the vicinity of the central focus detection frame 40a. Similarly, LED-L1_39b is near the left middle focus detection frame 40b, LED-L2_39c is near the left focus detection frame 40c, LED-R1_39d is near the right middle focus detection frame 40d, and LED-R2_39e is right focus detection frame 40e. LED-T_39f illuminates the vicinity of the upper focus detection frame 40f, and LED-B_40g illuminates the vicinity of the lower focus detection frame 40g.

Here, the illumination lights of the LEDs 39a to 39g illuminate the focus detection frames 40a to 40g so as to cover the entire focus detection frame or cover the entire focus detection frame so as to compensate for deviation due to manufacturing tolerance.

Also, one side of the frame lines of the focus detection frames 40a, 40b, 40c, 40d, 40e, 40f, and 40g is cut, and the cut regions are reflective regions 40h, 40i, 40j, 40k, 40l, 40m, and 40n. Is arranged.

The illumination light from each of the LEDs 39a to 39g is reflected by the reflection areas 40h, 40i, 40j, 40k, 401, 40m, and 40n, and the reflected light passes through the hollow pentagon 4, the third reflection mirror 5, and the eyepiece group 6. To be observed.

Here, the LED 39 only needs to illuminate the small-area reflection regions 40h to 40n provided in the focus detection frames 40a to 40g, and the light path of the illumination light of the LED 39 becomes short as in the first embodiment. In addition, it is possible to reduce the size of the illumination system (eg, the LED 39). Further, by providing the reflection areas 40h to 40n at the center of the cutting area of the focus detection frames 40a to 40g, the reflection areas 40h to 40n can be reliably illuminated even if the illumination light from the LED 39 is slightly shifted. There is no need to adjust the illumination light.

反射 As can be seen from the enlarged view on the lower side of FIG. 8, a reflection area 40h is provided on an extension of the cut frame line among the frame lines of the central focus detection frame 40a. The reflection area 40h reflects the illumination light of the LED 39a for superimposing illumination through the hollow pentagon 4 and the third reflection mirror 5 so as to guide the light to the photographer's eyes.

The reflection area 40h is composed of an aggregate of a plurality of fine reflection surfaces 40hS formed in the same shape, and the fine reflection surface 40hS is formed at a predetermined angle with respect to the surface of the focusing screen 40. .

Here, when the entire reflection region is configured as one reflection surface, the reflection region must be formed at a predetermined angle as described above, and in this case, the height difference becomes large at both ends of the reflection region, As will be described later, the reflection vapor deposition processing becomes non-uniform, and luminance unevenness occurs.

Therefore, the influence of the above-described height difference is reduced by configuring one reflection region as an aggregate of fine reflection surfaces having the same reflection angle as in the present embodiment. Here, the angle of inclination of the fine reflection surface with respect to the focusing screen 40 in the reflection region formed on one side of each focus detection frame is optimal so that the photographer can see the light reflected on the fine reflection surface in a good manner. Angle is set.

(4) The prism ridge line of the focus detection frame is formed so as to be substantially parallel to the illumination light of the LED 39 so that the illumination light from the LED 39 does not generate a reflected light component in the focus detection frame. Thus, even when the subject light has low luminance (when the observation environment is dark), the entire focus detection frame does not emit light, and only the reflection regions 40h to 40n arranged at the center of the cut regions of the focus detection frames 40a to 40g are exposed. Since the light is illuminated, the reflected light component increases as in the related art, so that the finder does not feel troublesome.

FIG. 9 is a viewfinder screen of the camera of this embodiment. In the finder screen, seven focus detection frames 40a, 40b, 40c, 40d, 40e, 40f, and 40g corresponding to the focus detection areas of the focus detection device 15 are displayed.

Since the photographer sees the focus detection frames 40a to 40g on the focusing screen 40 via the hollow pentagon 4 and the third reflection mirror 5, the focus detection frames 40a to 40g observed on the finder screen are shown in FIG. 8, the position of the focus detection frames 40a to 40g is inverted right and left.

The illumination light from the LED 39 for superimpose illumination covers the reflection surface regions 40h, 40i, 40j, 40k, 401, 40m, and 40n in each focus detection frame so as to cover these regions, and The light is projected with a light flux that does not illuminate the reflection area of the focus detection frames arranged around one focus detection frame.

The prism ridge line is positioned on the optical axis of the illumination light of the LED 39 so that the prism constituting the focus detection frames 40a to 40g does not emit meaningless light due to excess light in the illumination light from the LED 39 for superimposed illumination. It is formed so as to be substantially parallel with respect to.

Here, since the prisms of the focus detection frames 40a to 40g allow a part of the subject light L to pass through, the subject light L passing through this prism passes through the mat portion around the focus detection frame on the focusing screen 40. It is observed by the photographer as a darker translucent state. Thereby, the photographer can determine the focus detection frames 40a to 40g on the finder screen.

On the other hand, the surfaces of the reflection regions 40h to 40n provided on one side of the frame lines of the focus detection frames 40a to 40g are subjected to a reflection deposition process using a metal such as aluminum or chromium. Therefore, in the reflection areas 40h to 40n, the subject light L is hardly transmitted. Therefore, the reflection areas 40h to 40n are recognized as black points on the finder screen.

As a result, when the photographer looks through the viewfinder and observes a normal subject image without superimposed display, as described above, only the reflection areas 40h to 40n are recognized as black points. In this way, the subject image is not difficult to see.

When reflecting the illumination light from the LED 39, the reflection areas 40h to 40n need to be easily recognizable to a photographer who looks through the finder, and the photographer observes the subject image in a normal state. Sometimes it is necessary that the reflection areas 40h to 40n do not interfere with the observation. Therefore, the size of the reflection regions 40h to 40n needs to be a size that satisfies the above-described conditions. Specifically, it is preferable that the size of the reflection regions 40h to 40n be less than φ0.2 mm.

に お い て In FIG. 9, below the viewfinder screen, there is an information display section in the viewfinder for displaying information necessary for shooting, such as shutter speed, aperture, and charging completion display of the flash light emitting device.

In the present embodiment, a part of the frame line of the semi-transmissive focus detection frames 40a to 40g is cut, and the reflection regions 40h to 40n are arranged in the cut region. Therefore, for a photographer looking through the viewfinder, The focus detection frames 40a to 40g and the reflection areas 40h to 40n can be viewed as one frame. For this reason, the subject image can be observed without any discomfort even during normal viewfinder observation.

The present invention is not limited to only the above-described embodiment. In this embodiment, the reflecting area is formed directly on the focusing screen. However, a reflecting plate having a reflecting surface area for reflecting the superimposed LED light in the direction of the photographer's eyes is separately provided near the focusing screen. Then, the reflection on the reflection plate may be used.

FIG. 2 is a central longitudinal sectional view of the camera in the first embodiment. FIG. 2 is an exploded perspective view illustrating a superimposed illumination system in the camera according to the first embodiment. FIG. 2 is a perspective view of the camera according to the first embodiment and an enlarged view of a center focus detection frame. FIG. 3 is a perspective view of the camera according to the first embodiment and an enlarged view of a left focus detection frame. FIG. 3 is a diagram illustrating an inside of a viewfinder in the camera according to the first embodiment. FIG. 3 is an enlarged view of a reflection area according to the first embodiment. FIG. 3 is an enlarged vertical cross-sectional view of a reflection area of a center focus detection frame according to the first embodiment. FIG. 9 is a perspective view and an enlarged view of a center focus detection frame according to a second embodiment. FIG. 9 is a view showing the inside of a finder field of view of the camera according to the second embodiment.

Explanation of reference numerals

1: Camera body, 2: Main mirror, 3: Focusing screen,
3a to 3g: focus detection frame, 3h to 3n: reflection area, 4: hollow penta,
5: third reflecting mirror, 6: eyepiece lens group,
7: Focal plane shutter,
8: photometric lens, 9: photometric sensor, 10: LCD for displaying information in the finder,
11: LED for displaying information in the viewfinder, 12: triangular prism,
13: sub mirror, 15: focus detection device, 17: accessory shoe,
20: light emitting section of built-in flash light emitting device
30: LED for superimposed lighting,
30a: LED-C, 30b: LED-L1, 30c: LED-L2,
30d: LED-R1, 30e: LED-R2, 30f: LED-T,
30 g: LED-B,
31: diffusion plate, 32: aperture, 33: superimposing prism,
39a: LED-C, 39b: LED-L1, 39c: LED-L2,
39d: LED-R1, 39e: LED-R2, 39f: LED-T,
39g: LED-B
40a-40g: focus detection frame, 40h-40n: reflection area

Claims (9)

In a camera that irradiates illumination light to a focus detection area selected from among a plurality of focus detection areas and superimposes and displays the focus detection area in a finder visual field,
The focus detection area,
A frame region that forms the outer frame and transmits a part of the subject light beam;
A camera, which is provided inside the frame area, and is configured to include a reflection area for reflecting illumination light and guiding it to the eyes of a photographer. The camera according to claim 1, wherein the reflection area is provided substantially at the center of the focus detection area. In a camera that irradiates illumination light to a focus detection area selected from among a plurality of focus detection areas and superimposes and displays the focus detection area in a finder visual field,
The focus detection area is formed of a frame area that forms this outer frame and transmits a part of the subject light flux, and a reflection area for reflecting illumination light and guiding the eyes of a photographer,
A camera, wherein a part of the frame region is cut out, and the reflection region is provided in the cut-out region. The camera according to claim 3, wherein the reflection area is formed in a point shape. 4. The camera according to claim 3, wherein the frame region has two pairs of sides facing each other, and a substantially center of one of the sides is cut out. 5. The camera according to any one of claims 1 to 4, wherein the reflection area is subjected to a reflection deposition process on the surface. 7. The camera according to claim 6, wherein the area subjected to the reflection deposition processing is formed in a substantially circular shape. The camera according to claim 7, wherein the diameter of the area subjected to the reflection deposition processing is less than 0.2 mm. The camera according to claim 1, wherein the reflection area includes a plurality of fine prisms that reflect illumination light.

Images