JP4280472B2 - camera - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a camera having a superimpose display function for displaying a selected focus detection area among a plurality of focus detection areas provided in a viewfinder field.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, cameras having a superimpose display function as proposed in, for example, Japanese Patent Laid-Open Nos. 1-277225 and 5-333259 are known. In such a conventional camera, a plurality of displays arranged on the focusing screen are reflected by a quick return mirror composed of a half mirror through a light projection lens from an illumination means arranged in front of the pentaprism. The part is illuminated.
[0003]
Further, in the display object observing apparatus proposed in Japanese Patent Laid-Open No. 4-278931, an illuminating means is provided at the frontal portion of the pentaprism, and the illumination light from the illuminating means is transmitted through the pentaprism to be on the focusing screen. The display body provided in is irradiated.
[0004]
Further, in the optical apparatus proposed in Japanese Patent Laid-Open No. 10-048733, a distance measuring point display unit corresponding to the distance measuring point is provided in the information display unit in the finder for displaying the shutter speed and the aperture value.
[0005]
[Problems to be solved by the invention]
However, in the cameras disclosed in Japanese Patent Laid-Open Nos. 1-277225 and 5-333259 described above, the optical path from the illuminating means to the focusing screen is long, and the light flux from the illuminating means is changed several times by the light projecting lens, the main mirror, or the like. In addition to repeating refraction and reflection, the light guide efficiency is considerably poor because the main mirror is formed of a half mirror.
[0006]
In addition, the above-described camera requires a space for arranging a light projecting lens and the like, and requires adjustment work of the light beam emitted from the illuminating means, resulting in an increase in the size of the camera, an increase in cost, and a decrease in productivity. I will.
[0007]
On the other hand, when the entire focus detection frame is illuminated with LED light, there is no problem in shooting in a bright place, but in shooting in a dark place, the portion illuminated by the LED light has a large influence in the viewfinder field, so look into the viewfinder. The photographer may find the display in the viewfinder cumbersome.
[0008]
In the display object observation apparatus disclosed in Japanese Patent Laid-Open No. 4-278931, the focusing screen is illuminated through the pentaprism, so that the optical path is shortened and the light guide efficiency is improved. Therefore, it becomes difficult to dispose a built-in flash light emitting device at the front of the pentaprism.
[0009]
The display on the focusing screen has 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. For example, when the display body on the focusing screen is formed in a shape such as a double line or a cross, the subject image becomes difficult to see depending on the shape of the display body.
[0010]
In the optical apparatus disclosed in Japanese Patent Laid-Open No. 10-048733, a distance measuring point display unit corresponding to the distance measuring point is provided in the existing information display unit in the viewfinder that displays the shutter speed and aperture value outside the viewfinder field. The selected ranging point can be displayed without being up. However, since the display position is far from the actual distance measurement point displayed in the viewfinder field of view, it cannot be said that the visibility of the distance measurement point is good.
[0011]
Therefore, the present invention solves the above-described problems, improves the productivity by reducing the cost, downsizing, and adjusting the illumination light, and provides a superimposition with good visibility without giving the photographer a sense of incongruity. It aims to be realized.
[0012]
[Means for Solving the Problems]
The present invention provides a camera that irradiates illumination light to a focus detection area selected from a plurality of focus detection areas, and superimposes the focus detection area in a finder field. A subject image that can be observed through the eyepiece unit is formed by the light beam from the photographing optical system, and has a focusing screen with a Fresnel surface. Focus detection area Is , It is provided on the opposite side of the focusing screen from the Fresnel surface, this Focus detection A reflection part formed in a dot shape in the region and having an inclined surface for reflecting illumination light in a predetermined direction, and an inclined surface of the reflection part By evaporation process And formed with a reflective surface for reflecting the illumination light And The reflective surface is A circular shape, It is characterized by being formed in a region smaller than the region of the inclined surface.
[0013]
That is, by forming the reflecting surface in a region smaller than the region of the inclined surface of the reflecting portion, even if the position of the reflecting surface is slightly deviated when the reflecting surface is formed on the inclined surface by a reflective vapor deposition process or the like, a plurality of The shape of the reflection surface in each reflection part of the focus detection area is made equal. As a result, when the photographer observes the light reflected by the reflecting surface in the viewfinder field, the shape of the reflected light is prevented from being different for each focus detection area, and there is no sense of incongruity and a superimposing display with high quality. Can be realized.
[0014]
In addition, the present invention improves the visibility in the viewfinder field by reflecting the illumination light to the photographer's eyes by reflecting the illuminating light with a point-like reflecting portion (reflecting surface) formed in the focus detection area. I try to let them. Specifically, when the selected focus detection area is displayed in a superimposed manner, only the point-like reflection part (reflection part) is turned on with high brightness, so that the selected focus detection area is displayed to the photographer. It is made to recognize. Further, when the subject image is observed in a normal state without a superimpose display, only the point-like reflection part (reflection surface) is blacked out to prevent the subject image from being difficult to see.
[0015]
further The reflective surface is formed in a circular shape. And Than Steamed When the reflective surface is formed on the inclined surface of the reflective part by the deposition process, the shape of the reflective surface will not be disturbed even if the vapor deposition surface spreads due to the lifting of the jig, and there is no sense of incongruity. Display can be made.
[0016]
Specifically, when the surface (reflecting surface) on which the vapor deposition process is performed is a square, the corner may be bent during the vapor deposition process, and the shape may change. On the other hand, when the surface (reflecting surface) on which the vapor deposition process is performed is circular as in the present invention, the circular shape can be maintained even when the vapor deposition spreads, and the shape does not change. And it is suitable for the diameter of a reflective surface to be 0.1 mm or more and less than 0.2 mm.
[0017]
On the other hand, the reflection part can be composed of a plurality of fine reflection parts having inclined surfaces for reflecting illumination light in a predetermined direction.
[0018]
Here, the plurality of fine reflection portions can be formed in substantially the same size. Thereby, the illumination light reflected by the plurality of fine reflecting portions can be made more uniform, and the visibility of the superimpose display can be improved. Moreover, when forming a fine reflection part by pushing a cutting tool into the mold and processing it (molding), the cutting tool can be made common, so that the mold processing becomes easy.
[0019]
In addition, a plurality of fine reflection portions can be formed in a convex shape so that the protruding amounts are substantially equal. This , Fine When the vapor deposition process is performed on the inclined surface of the fine reflection part, the clearance with the jig becomes uniform, and a stable vapor deposition process can be performed on each fine reflection part.
[0020]
further , Anti The shooting part is an eyepiece out of the focusing screen. Part It can be integrally formed on the side surface. Thus, by integrally forming the reflecting portion on the focusing screen, it is possible to reduce the size and cost and to maintain the finder magnification.
[0021]
By maintaining the finder magnification, when a display member (panel) for superimposing display is provided in the camera in addition to the focusing screen, the distance from the focusing screen to the main point of the eyepiece is increased. Therefore, it is possible to prevent the viewfinder magnification from being lowered and the viewfinder image from appearing small.
[0022]
In addition, it is possible to arrange the reflection portions formed in each focus detection area among the plurality of focus detection areas in a state where the angle is changed in the plane of each focus detection area. Here, when the illumination light is irradiated from the predetermined position to each focus detection area at different irradiation angles, the shape of the inclined surface is reflected by the reflecting portion in order to accurately guide the illumination light to the photographer's eyes. It is necessary to make it different every time, and there is a possibility that unevenness occurs in the reflected light.
[0023]
On the other hand, by arranging the reflection portions at different angles in the plane of the focus detection area as in the present invention, the shape of each reflection portion (inclined surface) can be made uniform, and unevenness of reflected light can be prevented. be able to.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
(First embodiment)
The camera according to the first embodiment of the present invention will be described below with reference to the drawings and the like.
[0025]
FIG. 1 is a central longitudinal sectional view of a camera according to the present embodiment. Subject light L that passes through an imaging optical system (imaging optical system) (not shown) 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. Then, it 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 is focused on the film F after passing through the focal plane shutter (shutter) 7.
[0026]
The focusing screen 3 is disposed on a planned imaging surface of the photographing optical system, and the upper surface is configured by a mat surface 3a, on which a subject image is projected. Further, the lower side of the focusing clean 3 is constituted by a Fresnel surface 3b for collecting subject light. Note that seven focus detection areas are formed on the focusing screen 3 as described later.
[0027]
The hollow penta 4 and the third reflecting mirror 5 change the subject image projected on the focusing screen 3 to a focused erect image and guide it to the eyepiece lens group 6. The photographer can observe the subject image through the eyepiece lens group 6.
[0028]
A known photometric lens 8 and a photometric sensor 9 for measuring the subject luminance are arranged above the eyepiece lens group 6. Below the eyepiece group 6, an LCD 10 for displaying information in the finder for displaying photographing information outside the field of view of the finder, an LED 11 for displaying information in the finder, and a triangular prism for guiding the transmitted light of the LCD 10 to the finder. 12 are arranged.
[0029]
An illumination mechanism for superimpose display is disposed between the hollow penta 4 and the photometric lens 8, and details will be described later with reference to FIGS.
[0030]
There is a sub mirror 13 behind the main mirror 2, and the sub mirror 13 reflects the light beam transmitted through the main mirror 2 toward a focus detection device 15 disposed below the camera body 1. The focus detection device 15 includes a field lens 15a, a reflection mirror 15b, a diaphragm 15c, a secondary imaging lens 15d, and an AF sensor 15f arranged in the vicinity of the imaging surface.
[0031]
The focus detection device 15 in the present embodiment detects a focus adjustment state using a known phase difference detection method, and as shown in FIG. 4, a plurality of regions (seven locations) in the observation screen (in the viewfinder field) are detected. The focus detection area is used.
[0032]
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 attaching an external flash light emitting device to the accessory shoe 17, the camera body 1 can communicate with the flash light emitting device.
[0033]
The flash light emitting device 20 provided in the camera body 1 includes an Xe tube 20a that converts electrical energy into light energy, a reflector 20b and a panel 20c for efficiently condensing light emitted from the Xe tube 20a toward the subject side. And a trigger coil 20d for applying a voltage for starting light emission to the Xe tube 20a.
[0034]
The flash light emitting device 20 is housed in the front of the hollow penta 4 as shown in FIG. 1 when not in use, and rotates in the clockwise direction in FIG. 1 around a hinge shaft (not shown) as a rotation center when used. Then, it pops up above the camera body 1.
[0035]
FIG. 2 is an exploded perspective view of the illumination mechanism for superimpose 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, LED-B_30g).
[0036]
The diffusing plate 31 diffuses the illumination light from the LED 30 for superimpose illumination, widens the illumination range, and acts to make it difficult to see when the shadow of wire bonding formed in the manufacture of the LED 30 illuminates. To do. The diaphragm 32 prevents a ghost from being generated by unnecessary illumination light from the LED 30 for superimposing illumination.
[0037]
The superimposing prism 33 is subjected to a reflective vapor deposition process on the reflecting surface 33a. The reflecting surface 33a reflects the illumination light from the LED 30 and guides it into the hollow penta 4 from the opening 4a of the hollow penta 4. ing. Then, the illumination lights of the LEDs 30a to 30g are respectively irradiated on the focus detection areas formed on the focusing screen 3.
[0038]
The illumination light from the LED 30 is irradiated from the back side of the camera body 1 to the hollow penta 4 as shown in FIG. 1, and passes through the hollow penta 4 and is guided onto the focusing screen 3. It has come 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.
[0039]
FIG. 3 is a perspective view showing a state in which 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 penta 4 and the third reflecting mirror 5 are shown as a cross section cut at the center thereof. Further, an enlarged view of the central focus detection frame 3a formed at the center of the focusing screen 3 is shown on the lower side of FIG.
[0040]
In the figure, LED-C_30a illuminates the vicinity of the central focus detection frame 3a. Similarly, LED-L1_30b is in the vicinity of the left middle focus detection frame 3b, LED-L2_30c is in the vicinity of the left focus detection frame 3c, LED-R1_30d is in the vicinity of the right middle focus detection frame 3d, and LED-R2_30e is in the right focus detection frame 3e. The LED-T_30f illuminates the vicinity of the upper focus detection frame 3f, and the LED-B_30g illuminates the vicinity of the lower focus detection frame 3g.
[0041]
Here, the illumination lights of the LEDs 30a to 30g irradiate the focus detection frames 3a to 3g so as to cover the entire inclusion or the entire focus detection frame so as to compensate for the deviation due to manufacturing tolerances.
[0042]
The illumination lights of the LEDs 30a to 30g are respectively reflective areas (reflective portions) 3h, 3i, 3j, 3k, 3l, 3m, provided in the center of the focus detection frames 3a, 3b, 3c, 3d, 3e, 3f, and 3g. Reflected by 3n. This reflected light is observed through the hollow penta 4, the third reflecting mirror 5, and the eyepiece group 6.
[0043]
Here, the LED 30 only needs to illuminate the small reflective areas 3h to 3n provided in the focus detection frames 3a to 3g, and the optical path of the illumination light of the LED 30 is shortened as described above. It is possible to reduce the size of the system (LED 30 and the like). Furthermore, by providing the reflection areas 3h to 3n in the center of the focus detection frames 3a to 3g, the reflection areas 3h to 3n can be reliably illuminated even if the illumination light from the LED 30 is slightly shifted. There is no need to make adjustments.
[0044]
As can be seen from the enlarged view shown in the lower side of FIG. 3, the reflection region 3h provided in the center of the central focus detection frame 3a is used to transmit the illumination light of the superimpose illumination LED 30a to the hollow penta 4 and the third. The light is reflected so as to be guided to the eyes of the photographer through the reflection mirror 5. The reflection region 3h is composed of an assembly of a plurality of fine reflection portions 3hS formed in the same shape, and the fine reflection portion 3hS has a predetermined angle (inclined surface) with respect to the surface of the focusing screen 3. Is formed.
[0045]
Here, when the entire reflection region is formed by one surface, the reflection region must be formed with a predetermined angle as described above, and in this case, the height difference becomes large at both ends of the reflection region. The reflective vapor deposition process becomes non-uniform, resulting in uneven brightness.
[0046]
For this reason, the influence of the above-described height difference is reduced by configuring one reflection region as an aggregate of fine reflection portions having inclined surfaces having the same reflection angle as in the present embodiment. Here, the inclination angle of the inclined surface with respect to the focusing screen 3 in each fine reflection portion formed in the center of each focus detection frame is optimum so that the photographer can see the light reflected by the fine reflection portion satisfactorily. It is set to an angle.
[0047]
Further, 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 the reflected light components are not generated in the focus detection frames 3a to 3g with respect to the illumination light from the LED 30. Has been. As a result, even when the subject light has low brightness (when the observation environment is dark), the entire focus detection frame is not illuminated, and only the reflection areas 3h to 3n arranged at the centers of the focus detection frames 3a to 3g are illuminated. There is no need to feel troublesome in the viewfinder due to an increase in reflected light components as in the prior art.
[0048]
FIG. 4 shows a state where the superimpose illumination LED 30 illuminates each focus detection frame of the focusing screen 3 as in FIG. 3. The lower side of the figure shows an enlarged view of the left focus detection frame 3c located on the left (because the hollow penta 4 is reversed to become a normal image when viewed from the viewfinder). . In FIG. 4, the same members as those in FIG.
[0049]
As can be seen from the enlarged view shown in the lower part of FIG. 4, the reflection region 3j provided in the center of the left focus detection frame 3c is used for the illumination light of the superimpose LED 30c for the hollow penta 4 and the third reflection. 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 assembly of a plurality of fine reflection portions formed in the same shape as the reflection area 3h. The fine reflection portions are formed at a predetermined angle with respect to the surface of the focusing screen 3. Has been.
[0050]
However, unlike the reflection region 3h of the central focus detection frame 3a, the reflection region 3j of the left focus detection frame 3c is inclined by an angle θ with respect to the longitudinal direction of the left focus detection frame 3c. And the illumination light of LED30c for superimpose illumination and the longitudinal direction of a fine reflection part become substantially orthogonal.
[0051]
This is because the fine reflection portions in the reflection area of the focus detection frame existing on the left and right with the finder optical axis (center focus detection frame 3a) as the center are arranged in the horizontal and vertical arrangement as in the reflection area 3h of the center focus detection frame 3a. In order to guide the illumination light of the LED 30 to the photographer's eyes, it is necessary to incline it in two axes. When tilting in two axes in this way, the shape of the reflecting surface in the reflecting region becomes atypical, the size of the reflecting region changes depending on the position of the focus detection frame, and uneven brightness occurs.
[0052]
In order to prevent this, in the present embodiment, the reflection areas of the focus detection frames that exist on the left and right sides with respect to the finder optical axis (central focus detection frame 3a) are set to an angle θ with respect to the longitudinal direction of the focus detection frame. Tilted. As a result, the illumination light of the LED 30 can be accurately guided to the photographer by only changing the tilt of one axis to the optimum angle, and the variation in the size of the reflection area of each focus detection frame is prevented. can do.
[0053]
FIG. 5 is a viewfinder screen in the camera of this embodiment. In the finder screen, seven focus detection frames 3a, 3b, 3c, 3d, 3e, 3f and 3g corresponding to the focus detection area of the focus detection device 15 are displayed.
[0054]
Since the photographer views the focus detection frames 3a to 3g on the focusing screen 3 through the hollow penta 4 and the third reflection mirror 5, the focus detection frames 3a to 3g observed on the finder screen are shown in FIG. 3 is a positional relationship in which left and right are reversed with respect to the arrangement of the focus detection frames 3a to 3g.
[0055]
The illumination light from the LED 30 for superimpose illumination covers these areas for the reflection areas 3h, 3i, 3j, 3k, 3l, 3m, and 3n in each focus detection frame, and 1 The light is projected with a light beam that does not illuminate the reflection area of the focus detection frames arranged around the two focus detection frames.
[0056]
And this prism ridgeline is made into the optical axis of the illumination light of LED30 so that the prism which comprises the focus detection frames 3a-3g may not light meaninglessly by the excess light in the illumination light from LED30 for superimpose illumination. It is formed so as to be substantially parallel to the surface.
[0057]
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 the prism passes through the mat portion around the focus detection frame in the focusing screen 3. 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.
[0058]
On the other hand, the surface of the reflection regions 3h to 3n provided at the centers of the focus detection frames 3a to 3g is subjected to a reflective vapor deposition process (reflective surface) using a metal such as aluminum or chromium. For this reason, the subject light L is hardly transmitted in the reflection regions 3h to 3n. Therefore, the reflection areas 3h to 3n are recognized as black spots in the finder screen.
[0059]
Thus, when the photographer looks into the viewfinder and observes a normal subject image without a superimpose display, the reflection areas 3h to 3n are only recognized as black spots as described above. Thus, it is not difficult to see the subject image.
[0060]
When reflecting the illumination light from the LED 30, the reflection areas 3 h to 3 n need to be easily recognized by 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 interfere with 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.
[0061]
In FIG. 5, at the lower side of the finder screen, there is an in-finder information display section for displaying information necessary for shooting such as shutter speed, aperture, and flashing device charging completion display.
[0062]
FIG. 6 is a diagram in which only the seven reflection areas 3h to 3n at the center of the focus detection frames 3a to 3g are taken out and displayed.
[0063]
In each of the reflection regions 3h to 3n, fine reflection portions having a width of 40 μm and a length of 25 μm are arranged in a staggered manner so that a circle having a diameter of less than 0.2 mm is accommodated. Each of the reflective regions 3h to 3n is subjected to a reflective vapor deposition process using a metal in circular regions 3o, 3p, 3q, 3r, 3s, 3t, and 3u (indicated by hatching in the drawing) that fit in the reflective region.
[0064]
When the illumination light from the LED 30 is applied to the reflection regions 3h to 3n, the illumination light is reflected in the circular regions 3o to 3u subjected to the reflective vapor deposition treatment.
[0065]
Here, the reason why the region subjected to the reflective vapor deposition process is circular is as follows. That is, as described with reference to FIG. 4, in the focus detection frame located on the left and right with respect to the finder optical axis (central focus detection frame 3a), this reflection region is inclined at an angle θ with respect to the longitudinal direction of the focus detection frame. Since they are arranged so as to be arranged, they are circular in order to minimize variations in the shape of the reflecting surface in each of the reflecting regions 3h to 3n.
[0066]
In addition, the regions 3o to 3u are subjected to a vapor deposition process. At this time, since vapor deposition wraps around the mask, the vapor deposition region has a substantially circular shape in order to minimize the disorder of the shape of the vapor deposition region. It is because it is preferable to do.
[0067]
That is, by making the vapor deposition area circular, even when the vapor deposition process is performed on the areas 3o to 3u, even if the vapor deposition area widens due to the lifting of the jig, the shape of the vapor deposition area is less disturbed, and a high-quality superimpose display It can be carried out.
[0068]
Specifically, when the vapor deposition region is square, if the vapor deposition region expands, the shape of the vapor deposition region changes due to the corners falling. On the other hand, if the vapor deposition region is made circular, even if the vapor deposition region expands, it remains circular and there is no significant change in shape.
[0069]
Further, by making the area of the circular regions 3o to 3u slightly smaller than the area of the reflective regions 3h to 3n, it is possible to allow the positional deviation of the vapor deposition region when performing the vapor deposition operation on the reflective regions 3h to 3n. . Therefore, even if some misalignment of the vapor deposition region occurs, the circular regions 3o to 3u can be formed in the same shape, and variations in light reflected by the reflection regions 3h to 3n can be suppressed.
[0070]
FIG. 7 shows an enlarged vertical cross-sectional view of the reflective region 3h. As described above, the reflection region 3h is formed as an aggregate of the fine reflection portions 3hS having the same shape. An inclined surface 3hR having an inclination with respect to the surface of the focusing screen 3 is an actual reflecting surface. The inclination angle of the inclined surface 3hR is determined by the light flux projected from the superimpose illumination LED 30 being guided to the photographer. It is formed at an angle that can be removed.
[0071]
Further, the fine reflecting portion 3hS is formed in a convex shape with respect to the focusing screen 3, and the protruding amount is equal. Thereby, when performing a vapor deposition process to the inclined surface (3hR) of a some fine reflection part (3hS), a clearance with a jig | tool can be kept uniform and a vapor deposition process can be performed stably.
[0072]
In the present embodiment, the reflection regions 3h to 3n are arranged at the center of the focus detection frames 3a to 3g, but may be provided at any position within the focus detection frames 3a to 3g.
[0074]
【The invention's effect】
According to the present invention, the reflective surface is formed in a region smaller than the region of the inclined surface of the reflective portion, so that the reflective surface is applied to the inclined surface by the reflective vapor deposition treatment. Sense Therefore, even if the position of the reflecting surface is slightly shifted during formation, the shape of the reflecting surface in each reflecting portion of the plurality of focus detection regions is made equal. As a result, when the photographer observes the light reflected by the reflecting surface in the viewfinder field, the shape of the reflected light is prevented from being different for each focus detection area, and there is no sense of incongruity and a superimposing display with high quality. Can be realized.
[0075]
In addition, the present invention improves the visibility in the viewfinder field by reflecting the illumination light to the photographer's eyes by reflecting the illuminating light with a point-like reflecting portion (reflecting surface) formed in the focus detection area. I try to let them. Specifically, when the selected focus detection area is displayed in a superimposed manner, only the point-like reflection part (reflection part) is turned on with high brightness, so that the selected focus detection area is displayed to the photographer. Can be recognized. In addition, when observing the subject image in a normal state without the superimpose display, it is possible to prevent the subject image from becoming difficult to see by blacking out only the dot-like reflection part (reflection surface).
[Brief description of the drawings]
FIG. 1 is a central longitudinal sectional view of a camera according to an embodiment.
FIG. 2 is an exploded perspective view for explaining superimpose illumination in the camera of the present embodiment.
FIG. 3 is a perspective view of the camera of the present embodiment and an enlarged view of a central focus detection frame.
FIG. 4 is a perspective view and an enlarged view of a left focus detection frame in the camera of the present embodiment.
FIG. 5 is a view showing the viewfinder field in the camera of the present embodiment.
FIG. 6 is an enlarged view of a reflection area in the camera of the present embodiment.
FIG. 7 is an enlarged longitudinal sectional view of a reflection region of a central focus detection frame in the camera of the present embodiment.
[Explanation of symbols]
1: Camera body, 2: Main mirror, 3: Focusing screen,
3a-3g: focus detection frame, 3h-3n: reflection region, 4: hollow penta,
5: Third reflecting mirror, 6: Eyepiece group, 7: Focal plane shutter,
8: Photometric lens, 9: Photometric sensor, 10: LCD for displaying information in the viewfinder,
11: LED for displaying information in the viewfinder, 12: Triangular prism,
13: sub mirror, 15: focus detection device, 17: accessory shoe,
20: Light emitting part of internal flash light emitting device, 30: LED for superimpose illumination,
30a: LED-C, 30b: LED-L1, 30c: LED-L2,
30d: LED-R1, 30e: LED-R2, 30f: LED-T,
30 g: LED-B,
31: Diffuser, 32: Aperture, 33: Superimposing prism,
30a: LED-C, 30b: LED-L1, 30c: LED-L2,
30d: LED-R1, 30e: LED-R2, 30f: LED-T,
30g: LED-B

Claims (9)

In a camera that irradiates illumination light to a focus detection area selected from a plurality of focus detection areas and displays the focus detection area in a finder field in a superimposed manner,
A subject image that can be observed through the eyepiece unit is formed by the light beam from the photographing optical system, and has a focusing screen with a Fresnel surface.
The focus detection area is provided on the surface of the focusing screen opposite to the Fresnel surface, and is formed in a dot shape within the focus detection area, and is inclined to reflect illumination light in a predetermined direction. a reflecting portion having a surface, is formed by vapor deposition process on the inclined surface of the reflection portion, and a reflecting surface for reflecting the illumination light,
The camera, wherein the reflection surface is circular and is formed in a region smaller than a region of the inclined surface. The camera according to claim 1 , wherein a diameter of the reflecting surface is 0.1 mm or more and less than 0.2 mm.   2. The camera according to claim 1, wherein the reflection portion is configured by a plurality of fine reflection portions having inclined surfaces for reflecting illumination light in a predetermined direction. The camera according to claim 3 , wherein each of the plurality of fine reflection portions is formed to have substantially the same size. The camera according to claim 3 , wherein the plurality of fine reflection portions are formed in a convex shape, and the protrusion amounts of the fine reflection portions are substantially equal. Wherein the plurality of micro-reflector portion, camera according to any one of claims 3 to 5, characterized in being arranged in a plurality of rows. The camera according to prior Symbol reflecting portion is any one of claims 1 to 6, characterized in that it is integrally formed on a surface of the ocular side of the focusing screen. A prism portion for guiding a subject luminous flux from the focusing screen to the eyepiece unit ;
And an illuminating unit that is disposed on the rear side of the camera body with respect to the prism unit and above the eyepiece unit, and transmits illumination light to the focus detection region through the prism unit. The camera according to any one of claims 1 to 7 . 9. The reflection part formed in each focus detection region among the plurality of focus detection regions is arranged in a state where the angle is changed in a plane of each focus detection region . The camera according to any one of the above.

Images