JP4136948B2 - camera - Google Patents

Description

  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.

  Conventionally, cameras having a superimpose display function are known (for example, see Patent Documents 1 and 2). 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.

  In addition, there is a display body observation apparatus that illuminates a display body provided on a focusing screen by providing illumination means on the frontal portion of the pentaprism and transmitting illumination light from the illumination means through the pentaprism (for example, (See Patent Document 3).

Furthermore, 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 that displays a shutter speed and an aperture value (see, for example, Patent Document 4).
JP-A-1-277225 JP-A-5-333259 JP-A-4-278931 Japanese Patent Laid-Open No. 10-048733

  However, in the cameras described in Patent Documents 1 and 2 described above, the optical path from the illumination unit to the focusing screen is long, and the light beam from the illumination unit is repeatedly refracted and reflected many times by the projector 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, 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.

  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.

  In the display object observation apparatus in Patent Document 3, since the focusing screen is illuminated through the pentaprism, the optical path is shortened and the light guide efficiency is improved. However, the illumination means is arranged at the front of the pentaprism. Therefore, it becomes difficult to arrange a built-in flash light emitting device in the front part of the pentaprism.

  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.

  In the optical device disclosed in Patent Document 4, 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 field of view of the finder, so that the cost is not increased. The selected distance measuring point can be displayed. 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.

  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.

According to a first aspect of the present invention, 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 of view, each focus detection is performed. A frame region that forms an outer frame of the focus detection region, transmits a part of the subject light flux, and does not reflect the irradiated illumination light in a direction leading to the photographer's eyes, and the frame It is provided in a dot shape inside the line area, and is constituted by a reflection area for reflecting the irradiated illumination light and guiding it to the eyes of the photographer.

In other words, the illumination light is reflected by a point-like reflection area provided in the focus detection area (in the area surrounded by the frame line area) and guided to the photographer's eyes so that it can be viewed in the viewfinder field of view. I try to improve the sex.

Specifically, when the selected focus detection area is displayed in a superimposed manner, only the dotted reflection area is lit with high brightness so that the photographer can recognize the selected focus detection area. ing. Further, when the subject image is observed in a normal state without a superimpose display, only the dotted reflection area is blacked out to prevent the subject image from becoming difficult to see.

According to a second aspect of the present invention, each focus detection is performed in a camera that irradiates illumination light to a focus detection region selected from a plurality of focus detection regions and displays the focus detection region in a pose field of view. region, the focal point to form an outer frame of the detection region, and the formed border region so as not to reflect in the direction leading to the eyes of the photographer illumination light irradiated while transmitting a part of the subject light beam is irradiated It is composed of a point-like reflection area for reflecting the illumination light to be taken into the eyes of the photographer. A part of the frame area is cut out, and a reflection area is provided in the cut-out area. It is characterized by being. Also in the present invention, the same effect as in the first invention of the present application can be obtained.

  Here, the surface of the reflective region can be subjected to a reflective vapor deposition process to reflect the illumination light. Further, the region subjected to the reflective vapor deposition treatment can be formed in a substantially circular shape, or the diameter of this region can be made less than 0.2 mm.

According to the present invention, by the direct to the eye of the photographer by reflecting the illumination light at the point-shaped reflection area provided in the focus detection area (the area surrounded by the border region), viewfinder The visibility in the field of view is improved.

Specifically, when the selected focus detection area is displayed in a superimposed manner, only the point-like reflection area is turned on with high luminance, so that the photographer can recognize the selected focus detection area. it can. In addition, when observing the subject image in a normal state without a superimpose display, it is possible to prevent the subject image from becoming difficult to see by blacking out only the dotted reflection areas.

  Examples of the present invention will be described below.

  A camera that is Embodiment 1 of the present invention will be described below with reference to the drawings and the like.

  FIG. 1 is a central longitudinal sectional view of a camera in this 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.

  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.

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

  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 lens 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.

  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.

  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.

  The focus detection device 15 in the present embodiment detects the 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.

  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.

  The light emitting unit 20 of the flash light emitting device provided in the camera body 1 includes an Xe tube 20a that converts electrical energy into light energy, and a reflector 20b that efficiently collects light emitted from the Xe tube 20a toward 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 flashlight emitting device is housed in the forehead of the hollow penta 4 as shown in FIG. 1 when not in use, and when used in the clockwise direction in FIG. By rotating, it pops up above the camera body 1.

  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).

  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.

  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.

  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.

  FIG. 3 is a perspective view showing how the 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.

  In the figure, 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. 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.

  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.

  The illumination lights of the LEDs 30a to 30g are provided in the center of the focus detection frames 3a, 3b, 3c, 3d, 3e, 3f, and 3g, respectively, and are smaller areas than the areas surrounded by the focus detection frames 3a to 3g. Reflected in the reflective areas 3h, 3i, 3j, 3k, 3l, 3m, 3n. This reflected light is observed through the hollow penta 4, the third reflecting mirror 5, and the eyepiece group 6.

  Here, the LED 30 basically only needs to illuminate the small reflective areas 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 (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.

  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 surfaces 3hS formed in the same shape, and the fine reflection surface 3hS is formed with a predetermined angle with respect to the surface of the focusing screen 3. .

  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.

  For this reason, 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 this embodiment. Here, the inclination angle of each fine reflecting 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 reflecting surface well. Is set.

  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.

  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.

  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 aggregate of a plurality of fine reflection surfaces formed in the same shape as the reflection area 3h. The fine reflection surface is formed at a predetermined angle with respect to the surface of the focusing screen 3. Has been.

  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 reflective surface become substantially orthogonal.

  This is because the fine reflective surfaces 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 a 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.

  In order to prevent this, in the present embodiment, the reflection regions of the focus detection frames that exist on the left and right with the finder optical axis (central focus detection frame 3a) as the center are set at a predetermined angle θ with respect to the longitudinal direction of the focus detection frame. Just leaning. 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.

  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.

  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.

  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.

  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.

  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.

  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 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.

  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.

  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.

  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.

  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.

  In each of the reflection regions 3h to 3n, fine reflection surfaces 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.

  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.

  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 positioned on the left and right with respect to the finder optical axis (central focus detection frame 3a), this reflection region is set at a predetermined angle θ with respect to the longitudinal direction of the focus detection frame. Since it is arranged to be inclined, it is circular in order to minimize variations in the shape of the reflection surface in each of the reflection regions 3h to 3n.

  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.

  On the other hand, 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 a displacement of the vapor deposition region when performing the vapor deposition operation on the reflective regions 3h to 3n. .

  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 surfaces 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.

  In the present 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 within the focus detection frames 3a to 3g.

  A camera that is Embodiment 2 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 this embodiment. 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 40a formed at the center of the focusing screen 40 is shown on the lower side of FIG.

  In the figure, 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. The LED-T_39f illuminates the vicinity of the upper focus detection frame 40f, and the LED-B_40g illuminates the vicinity of the lower focus detection frame 40g.

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

  Moreover, one side is cut | disconnected among the frame lines of each focus detection frame 40a, 40b, 40c, 40d, 40e, 40f, 40g, and reflection area | region 40h, 40i, 40j, 40k, 40l, 40m, 40n is cut | disconnected to this cutting | disconnection area | region. Is arranged.

  Illumination light from each of the LEDs 39a to 39g is reflected by the reflection regions 40h, 40i, 40j, 40k, 40l, 40m, and 40n, and this reflected light passes through the hollow penta 4, the third reflection mirror 5, and the eyepiece group 6. Observed.

  Here, the LED 39 only needs to illuminate the small reflective areas 40h to 40n provided in the focus detection frames 40a to 40g, and the optical path of the illumination light of the LED 39 is shortened as in the first embodiment. It is possible to reduce the size of the illumination system (LED 39, etc.). Furthermore, by providing the reflection areas 40h to 40n in the center of the cut areas 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.

  As can be seen from the enlarged view on the lower side of FIG. 8, a reflection region 40h is provided on the extended line of the cut frame line in the frame line of the central focus detection frame 40a. The reflection area 40 h reflects the illumination light of the superimpose illumination LED 39 a so as to be guided to the photographer's eyes through the hollow penta 4 and the third reflection mirror 5.

  The reflection region 40h is composed of an assembly of a plurality of fine reflection surfaces 40hS formed in the same shape, and the fine reflection surface 40hS is formed with 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 with a predetermined angle as described above, and in this case, the height difference at both ends of the reflection region becomes large. As will be described later, the reflective vapor deposition process becomes non-uniform and luminance unevenness occurs.

  For this reason, 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 this embodiment. Here, the inclination angle of the fine reflective surface with respect to the focusing screen 40 in the reflective region formed on one side of each focus detection frame is optimal so that the photographer can see the light reflected by the fine reflective surface well. The angle is set.

  Further, the prism ridge line of the focus detection frame is formed to be substantially parallel to the illumination light of the LED 39 so that the reflected light component is not generated in the focus detection frame with respect to the illumination light from the LED 39. Thereby, even when the subject light has low luminance (when the observation environment is dark), the entire focus detection frame does not shine, and only the reflection regions 40h to 40n arranged at the center of the cut regions of the focus detection frames 40a to 40g. Therefore, the finder does not feel bothersome due to an increase in reflected light components as in the prior art.

  FIG. 9 is a viewfinder screen in 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 region of the focus detection device 15 are displayed.

  Since the photographer views the focus detection frames 40a to 40g on the focusing screen 40 through the hollow penta 4 and the third reflection mirror 5, the focus detection frames 40a to 40g observed on the finder screen are shown in FIG. 8 is a positional relationship in which left and right are reversed with respect to the arrangement of the focus detection frames 40a to 40g.

  The illumination light from the LED 39 for superimpose illumination covers these areas with respect to the reflection surface areas 40h, 40i, 40j, 40k, 40l, 40m, and 40n 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.

  Then, the prism ridge line is placed on the optical axis of the illumination light of the LED 39 so that the prisms constituting the focus detection frames 40a to 40g do not shine meaninglessly due to excess light in the illumination light from the LED 39 for superimpose illumination. It is formed so as to be substantially parallel to the surface.

  Here, since the prisms in the focus detection frames 40a to 40g 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 40. It is observed by the photographer as a darker translucent state. Thus, the photographer can determine the focus detection frames 40a to 40g on the finder screen.

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

  As a result, when the photographer looks into the viewfinder and observes a normal subject image without a superimpose display, the reflection areas 40h to 40n are only recognized as black spots as described above. Thus, it is not difficult to see the subject image.

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

  In FIG. 9, 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.

  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 areas 40h to 40n are arranged in the cut areas. Therefore, for a photographer looking into the viewfinder, The focus detection frames 40a to 40g and the reflection regions 40h to 40n can be viewed as one frame. For this reason, the subject image can be observed without a sense of incongruity even during normal viewfinder observation.

  The present invention is not limited to the embodiments described above. In this embodiment, the reflective area is formed directly on the focusing screen, but a reflector having a reflective surface area that reflects the superimposed LED light in the direction of the photographer's eyes is provided near the focusing screen. Thus, the reflection on the reflecting plate may be used.

FIG. 2 is a central vertical cross-sectional view of the camera in Embodiment 1. FIG. 3 is an exploded perspective view for explaining a superimpose illumination system in the camera of Embodiment 1; FIG. 3 is a perspective view and an enlarged view of a central focus detection frame in the camera of Embodiment 1. FIG. 3 is a perspective view of the camera of Example 1 and an enlarged view of a left focus detection frame. FIG. 3 is a view showing the viewfinder field in the camera of Embodiment 1; FIG. 3 is an enlarged view of a reflection region in Example 1. FIG. 3 is an enlarged vertical cross-sectional view of a reflection region of a central focus detection frame in Embodiment 1. The perspective view in Example 2 and the enlarged view of a center focus detection frame. FIG. 10 is a diagram showing the viewfinder field in the camera of Embodiment 2.

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 reflection 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 emission part of built-in 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,
39a: LED-C, 39b: LED-L1, 39c: LED-L2,
39d: LED-R1, 39e: LED-R2, 39f: LED-T,
39 g: LED-B
40a to 40g: focus detection frame, 40h to 40n: reflection region

Claims (8)

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,
Each focus detection region is
Forming an outer frame of this focus detection region, a frame region formed so as to transmit a part of the subject luminous flux and not reflect the illumination light irradiated to the eye of the photographer ;
Provided on the inner side of the border area to the point-like, a camera, characterized in that it is constituted by a reflection region for guiding the eye reflected by photographer illumination light irradiated.   The camera according to claim 1, wherein the reflection area is provided at a substantially center of the focus detection area. 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,
Each of the focus detection areas forms an outer frame of the focus detection area, and is a frame area formed so as to transmit a part of the subject luminous flux and not to reflect the irradiated illumination light in a direction leading to the photographer's eyes When, is constituted by a point-like reflection region for directing the eyes of reflection to photographer illumination light irradiated,
A camera, wherein a part of the frame area is cut out and the reflection area is provided in the cut-out area.   The camera according to claim 3, wherein the frame region has two sets of sides facing each other, and a substantially center of one of the sides is cut out.   The camera according to any one of claims 1 to 3, wherein the reflective region is subjected to a reflective vapor deposition treatment on the surface thereof.   The camera according to claim 5, wherein the region subjected to the reflective vapor deposition treatment is formed in a substantially circular shape.   The camera according to claim 6, wherein a diameter of the region subjected to the reflective vapor deposition treatment is less than 0.2 mm. The camera according to any one of claims 1 to 3, wherein the reflection region includes a plurality of fine prisms that reflect illumination light.

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