JPH04114040U - Display observation device - Google Patents

Abstract

(57) [Summary] [Purpose] It can be implemented with a simple structure in a limited space near the pentaprism, has good light guide efficiency, and there is no need to worry about light leakage to the film surface. space,
Achieve power savings. [Structure] The light from the illumination means 20 and the lighting window 21 is guided to the front part of the pentaprism 6, and the light at the position selected by the selective transmission means 23 is transmitted through the pentaprism and illuminates the matte surface of the screen board. A portion of the irradiated light is guided to the eye point by a mirror surface 24 formed on the matte surface. When the outside light is bright, the illumination means can be turned off and the selective transmission means can be used for display outside the viewfinder.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a display observation device that displays a distance measurement position within a photographic screen, and in particular, Relating to a display object observation device used in a camera having a focus detection device capable of point distance measurement It is something.

0002

[Conventional technology]

Conventionally, single-lens reflex cameras, etc., use an image formed by a photographic lens on a screen. At the same time, a display observation device installed on the screen allows you to check the focus status and measurement. The distance position can be observed at the same time. For this reason, it has a focus detection device capable of multi-point distance measurement. For cameras, it is necessary to clearly specify the location where distance measurement is to be performed. That is, within Fida Set up multiple ranging areas corresponding to the detection position, and select which ranging area to perform ranging. need to be displayed.

0003 FIG. 8 is a diagram showing a conventional example of a display observation device that displays a distance measurement area. Ma First, a camera to which a conventional display object observation device is applied will be briefly described. Camera body 1 A lens barrel 2 is attached to the lens barrel 2, and a photographing lens 3 is attached to the optical axis of the lens barrel 2. It is held movable in the direction. Here, part of the luminous flux that has passed through the photographic lens 3 is reflected by the movable half mirror 4 and is reflected from the pentaprism 6, eyepiece 7, etc. The light is incident on the finder system. In addition, part of the luminous flux is reflected by a movable half mirror. 4 and is rotatably supported with respect to the movable half mirror 4. -8 and can measure distance at multiple positions within the shooting screen provided at the bottom of the camera. The light is incident on the focus detection device 9.

0004 A conventional display observation device includes an illumination means 81, a support section 82, a lens array 83, and a projection device. It consisted of an optical lens 84, a screen 85, and the like. Luminous flux from illumination means 81 is projected onto the movable half mirror 4 via the lens array 83 and the projection lens 84. After being reflected by the movable half mirror 4, Among the number display sections, select the display section corresponding to the position to be measured by the focus detection device 9. illuminate. The illuminated display section is connected to the object image formed on the screen 85. Both are observed through a finder system (see Japanese Patent Laid-Open No. 1-277225).

[0005] FIG. 9 is a diagram for explaining the structure near the mount of an AF single-lens reflex camera. . On the other hand, recent AF single-lens reflex cameras monitor the aperture position of the photographing lens 3. Therefore, an aperture ring 15 corresponding to the lens aperture diameter is provided in a part of the lens barrel 2. There is. A convex portion 2a provided in a part of this aperture ring 15 is used to attach the lens barrel 2. Sometimes, it is connected to the interlocking ring 18 on the camera side. In addition, a part of the interlocking ring 18 is provided. The brush 19 is in contact with the resistor board 17 fixed to the camera body 1, and its The resistance value determined by the brush 19 and the resistance board 17 corresponds to the aperture position of the photographic lens 3. Become. Also, the contact 2b is connected to the contact 16 on the camera body 1 side when the lens is attached. and the lens hardness stored in the lens CPU 2c built into the lens barrel 2. The information on the existence of the camera body 1 is transmitted to the camera body 1 side.

[0006]

[Problem that the idea aims to solve]

In the display object observation device shown in FIG. The optical path to the display body is long, and the projection lens 84, which is a prism assembly, and the movable The light beam is reflected many times by the half mirror 4 and the like. For this reason, the light guiding efficiency decreases. This necessitates an increase in the size of the lighting means 81, which increases costs and reduces power consumption. The light flow will increase, and there is also the possibility of light leakage to other areas.

[0007] In addition, as described above, the lens array 83, the light projection lens 84, the movable half mirror Since a large number of light guiding members such as -4 etc. are used, placement errors accumulate and the It becomes difficult to determine the lighting position. Therefore, each light guide member must be installed with high precision. This necessitates complicated work such as optical path adjustment and optical path adjustment, which increases costs.

[0008] Furthermore, if a light guide member for illumination is placed in front of the pentaprism 6, Only bigger space is required. In particular, AF single-lens reflex cameras as shown in Figure 9 In A, there is a connection section for the aperture position information of the photographing lens 3, and a detection section for the position information. (resistance board, digital pattern and detection brush), and AF In the case of a lens or AF camera body, the lens side information unit (lens side CPU) and body In many cases, a connecting part (contact part) with the body-side information section (body-side CPU) is provided. However, it is true that the illumination light source of the display object observation device is placed in front of the pentaprism 6. It is difficult to do so.

[0009] On the other hand, it is necessary to provide a plurality of lighting means corresponding to the multi-point display body that performs display. This requires a large amount of mounting space and increases costs. Also, lighting The means must always emit illumination light in order to display the display object, Power consumption becomes large.

0010 The purpose of this invention is to solve the above-mentioned problems and to solve the problem in the limited space near the pentaprism. It can be mounted with a simple structure, has good light guiding efficiency, and has no light leakage to the film surface. In addition to eliminating the need to worry about lighting problems, this table requires only one lighting method and saves space and power. An object of the present invention is to provide a demonstration observation device.

[0011]

[Means to solve the problem]

In order to solve the above-mentioned problems, the display object observation device according to the present invention has a screen for object observation. Multiple focus detection display bodies are formed on the matte surface of the screen and selectively illuminated. In the display observation device to be observed, there is an illumination means for emitting illumination light and a lighting means for illuminating natural light. a lighting window that directs the light from the lighting means and the lighting window to the front of the pentaprism. a light guide member that guides the light to the pentaprism; and a light guide member that selectively guides light from the light guide member into the pentaprism. A selectively transmitting means transmits, and a part of the irradiation light transmitted through the selectively transmitting means is an eye point. a plurality of mirror surfaces formed on the matte surface at an angle that guides the It consists of a display body.

0012 In this case, the illumination means adjusts the brightness of the outside light measured by the photometry means to a preset brightness. It can be configured to turn on when the following conditions occur.

[0013] Further, the selective transmission means may be configured to display outside the viewfinder field of view. Wear.

[0014] Furthermore, the selection aperture means is configured to close the viewfinder when displaying outside the viewfinder field of view. The transmission area can be configured to be smaller than when displaying within the field of view.

[0015]

[Effect]

According to the present invention, the luminous flux from one illumination means or daylighting window is transmitted to the selective transmission means. Therefore, the light that is selectively guided to the display on the screen through the pentaprism It has good light guide efficiency. In addition, depending on the brightness of outside light, only the light from the daylight window is used. Display outside the viewfinder field of view due to external light, and display within the viewfinder field of view due to illumination light. - You can switch to per-imposed display.

[0016]

【Example】

Hereinafter, the present invention will be described in detail with reference to the drawings and the like. Figure 1-Figure 5 is a diagram showing an embodiment of the display object observation device according to the present invention, and FIG. A schematic diagram showing the case where this is applied to a single-lens reflex camera. Figure 2 shows the vicinity of the viewfinder optical system. 3 is a perspective view of the viewfinder frame, and FIGS. 4 and 5 are views of the viewfinder frame, respectively. They are a side view and a perspective view showing a screen. The basic configuration of a single-lens reflex camera Components similar to those in the conventional example described above (Figs. 8 and 9) are designated by the same reference numerals. There is.

[0017] The display observation device of this embodiment is for displaying the distance measurement position of multi-point distance measurement AF. As shown in FIGS. 1 and 2, it includes a light source 20, a lighting window 21, and a prism 2. 2, a liquid crystal shutter 23, display bodies 24a to 24c, etc.

[0018] The light source 20 is for emitting illumination light, and for example, an LED or the like is used. It is. The lighting window 21 is a window for letting outside light into the camera body. Puri The prism 22 directs light from the light source 20 and the lighting window 21 to the head of the pentaprism 6. It is meant to guide you. The liquid crystal shutter 23 controls the light from the prism 22, which will be described later. The pentaprism 6 is for selectively irradiating the display bodies 24a to 24c. It is installed in close contact with the surface of the lens, and opens only the selected optical path in an arbitrary shape. Other parts are shaded.

[0019] The CPU 100 is for controlling the display on the display body 24, and is for controlling the display on the display body 24. 01 and 102, respectively, are connected to the light source 20 and the liquid crystal shutter 23. There is. This CPU 100 includes a focus detection device 9, a photometric element 10, a selection switch 1 A signal such as 03 is connected.

[0020] As shown in FIG. 1, the screen 5 has a matte surface 5a on its upper surface that serves as an image forming surface. A Fresnel lens 5b is formed on the lower surface. This screen 5 A display body 24 is provided on the top surface. The display bodies 24a to 24c are screens. They are arranged in a row horizontally in the center of the screen, displaying the three distance measurement points, and displaying the viewfinder. When you look into it, you can see it as shown in Figure 3. The display bodies 24a to 24c each have The part sandwiched between the two upper and lower lines corresponds to the distance measurement position of the focus detection device 9 shown in FIG. According to the selected ranging position, one of the display bodies 24a to 24c is illuminated. be done. Note that the circle Z shown in FIG. This is the photometric zone of the element 10.

[0021] In addition, as shown in Figure 3, there is a liquid outside the viewfinder field of view at the position shown by the two-dot chain line. Since there will be a crystal shutter 23, use the three shutter parts 23 as a viewfinder. It can be used as an outside LCD display. The CPU 100 uses a focus detection device 9. Based on the detected ranging information, the driver 102 is driven to close the liquid crystal shutter 23. The shutter sections 23a to 23c are selectively opened and closed. In addition, selection switch S103 , you can manually select the distance measurement position and use the It is also possible to control the opening and closing of the data parts 23a to 23c.

[0022] Next, the display body 24 will be explained in more detail. The display body 24 is shown in FIG. As shown in FIG. b, 24c are arranged in one horizontal row. Planar shape of display bodies 24a, 24b, 24c The shape is formed by two parallel lines, and the thickness of the lines has no effect on photometry. For example, it is preferably about 0.2 to 0.3 mm. Delicious. These display bodies 24a, 24b, 24c are as shown in FIG. 4 when viewed from the side. It is formed on the slope of a protruding mountain. There are two mirror surfaces on the slope of this mountain. 4M is formed, and the angle of the inclined surface is the same as the light beams A1 and B projected from the light source 20. 1 is shaped at an angle such that light is guided to the eye point EP of the observer looking into the eyepiece 7. has been completed.

[0023] In addition, this display body 24 is designed to improve visibility and reduce power consumption of the light source 20. In addition, a semi-transparent mirror surface 24M is provided. This mirror surface 24M is covered with a metal foil film. Although it is formed by vapor deposition, if the surface has a reflectance that allows the reflected light to be visually recognized, then the light Other materials may be used depending on the type of source 20, etc.

[0024] A part of the irradiated light C1 projected onto a surface other than the mirror surface 24M of the screen 5 is matte. The reflected light C2 from the surface 5a travels in the direction of the eye point EP, but as shown in FIG. In addition, since the projection angle θ is set to 25° or more with respect to the direction of the eyepoint EP, The reflected light from the entire surface 5a hardly enters the eyepiece 7 and is not visually recognized. Not possible. As a result, only the reflected lights A2 and B2 from the mirror surface 24M of the display body 24 is clearly visible and other ghost lights are removed.

[0025] Note that the position of the liquid crystal shutter 23 is determined according to the irradiation light from the light source 20 or the lighting window 21. To prevent ghost light, the projection angle θ shown in Figure 4 should be set to 25° or more as described above. It is preferable that the

[0026] Next, mainly referring to Figs. 1 and 2, we will explain the viewfinder using this display object observation device. Superimposed display within the field of view will be explained. First, through the photographic lens 3 A part of the luminous flux reflected by the movable half mirror 4 forms an image on the screen 5, It can be observed with a finder system consisting of a pentaprism 6, an eyepiece 7, etc.

[0027] On the other hand, a part of the light beam passes through the movable half mirror 4 and is reflected by the movable mirror 8. and enters the focus detection device 9. The focus state is detected by the focus detection device 9. When the focus distance measurement zone is Accordingly, any one of the shutter parts 23a to 23c of the liquid crystal shutter 23 is selectively opened. to illuminate one of the display bodies 24a, 24b, and 24c.

[0028] As mentioned above, the display bodies 24a, 24b, 24c are efficiently displayed on the mirror surface 24M. It is reflected and passes through the finder system together with the object image formed on the screen 5. It can be observed with good visibility.

[0029] When the selection of the focal position is completed, the CPU 100 closes the liquid crystal shutter 23. Thereafter, focusing is performed on the selected distance measurement area. CPU1 00 opens the liquid crystal shutter 23 again after focusing is completed, and displays the display bodies 24a, Either 24b or 24c momentarily emits light to indicate the in-focus state.

[0030] Next, we will explain the operation of the distance measurement position and focus display using the display outside the viewfinder field of view. I will clarify. If the outside light is very bright, a superimposed table using the light source 20 may be used. The display may become difficult to see. At this time, the light emission from the light source 20 is adjusted to the brightness of external light. At the same time, it is conceivable to increase the brightness, but the power consumption would be extremely large. Therefore , when the outside light is bright, the illumination optical path of the light source 20 is used as it is, and the lighting window 21 is The shutter parts 23a to 23c of the liquid crystal shutter 23 are used as a viewfinder. Use as a liquid crystal display outside the field of view.

[0031] At this time, when the detected value from the photometric element 10 exceeds a predetermined value, the CPU 100 turns off the light source 20 via the driver 101, conversely reducing power consumption. It can be held down.

[0032] Displays outside the viewfinder field of view are indicated by arrows, etc., as shown in Figure 3, for example. be able to. In other words, in the case of superimpose display by irradiation with the light source 20, , the opening shape of the shutter portions 23a to 23c of the liquid crystal shutter 23 may be circular; When displaying the shutter parts 23a to 23c directly outside the viewfinder field of view, use arrows, etc. It is desirable to have a shape that is easy to recognize. Also, at this time, reduce the opening area. By doing so, it is possible to avoid affecting photometry. finder field of view The timing of the outer display is the same as the superimpose display described above. Ru.

[0033] Also, superimposed display within the viewfinder field of view or liquid outside the viewfinder field of view. The crystal display can also be selected using an external operation switch or the like. Also, measurement Automatically switching according to the brightness of outside light measured by the optical element 10 You can also do it.

[0034] 6 and 7 are diagrams showing other embodiments of the display object observation device according to the present invention. , FIG. 6 is a side view, and FIG. 7 is a perspective view. In the embodiment described above, the mountain part of the screen 5 Although the mirror surface 24M is formed on the slope of the valley, the display body 34 of this embodiment is formed on the slope of the valley. A mirror surface 34M is provided at .

[0035] The present invention is not limited to the embodiments described above, and various modifications and changes can be made. is within the range of The display body is not limited to the letter D shape, but may also be other shapes such as a cross shape. The number can be increased or decreased depending on the distance measurement zone of the focus detection device.

[0036] Also, the timing of the display is determined by pressing the release button halfway and then affecting the photometry system. within a predetermined time, and the focus detection device 9, selection switch 103, distance measurement area A predetermined short period of time when the ranging position is selected by the signal from the selection switch. In other words, when performing distance measurement and calculation and driving the focus, Just go. Furthermore, the light metering is performed so as not to affect the light metering in the viewfinder. It is also possible to illuminate intermittently while distance measurement is being performed.

[0037] Although the explanation here uses an example of application to a single-lens reflex camera, the display of other devices may also be used. It can also be applied to a body observation device, and it is possible to save labor for illumination means.

[0038]

[Effect of the idea]

As explained in detail above, the light from the lighting means or daylighting window is transferred to the pentaprism. The light flux at the position selected by the selective transmission means is guided to the forehead of the The light path from the illumination means to the display can be easily It can be made shorter and the lighting efficiency can be increased. At this time, if the display body is a reflective surface, This improves visibility and saves labor. Therefore, only one lighting means is required and assembly is easy. This improves performance, reduces space constraints, and reduces impact on other mechanical parts. It disappears. In addition, power consumption can be kept low, and there is no need to worry about light leakage to other parts. It also disappears.

[0039] Also, the light turns on when the outside light falls below a preset brightness. This allows you to reduce power consumption. In addition, the outside light is bright and the viewfinder display is bright. If it is difficult to see, the selective transmission means can be set up using external light guided through the lighting window. Since the display can be displayed outside of the scanner's field of view, it reduces power consumption and ensures reliable display. can be displayed. When the display is outside the viewfinder field of view, the display is within the viewfinder field of view. Since the transmission area of the selective aperture means can be made smaller than in the case of The impact will be less.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing a case where an embodiment of a display object observation device according to the present invention is applied to a single-lens reflex camera.

FIG. 2 is a perspective view showing an embodiment of the display object observation device according to the present invention.

FIG. 3 is a plan view showing an example of a viewfinder display according to an embodiment of the display object observation device according to the present invention.

FIG. 4 is a side view showing an observation screen used in an embodiment of the display object observation apparatus according to the present invention.

FIG. 5 is a perspective view showing a viewing screen used in an embodiment of the display viewing device according to the present invention.

FIG. 6 is a side view showing another embodiment of the display object observation device according to the present invention.

FIG. 7 is a perspective view showing another embodiment of the display object viewing device according to the present invention.

FIG. 8 is a diagram showing a conventional example of a display observation device that displays a distance measurement area.

FIG. 9 is a diagram for explaining the structure around the mount of the AF single-lens reflex camera.

[Explanation of symbols]

1 Camera body 2 Lens barrel 2a Convex part 2b Contact 2c Lens CPU 3 Photographic lens 4 Movable half mirror 5 Observation screen 5a Matte surface 5b Fresnel lens 6 Pentaprism 7 Eyepiece 8 Movable mirror 10 Photometric element 20 Light source 21 Lighting window 22 Prism 23 LCD shutter 24, 34 Display body 24M display mirror surface 100 CPUs 101,102 driver 103 Selection switch

Claims (4)

[Scope of utility model registration request] 1. A display observation device in which a plurality of focus detection display bodies are formed on a matte surface of an object observation screen and are selectively illuminated for observation, comprising: an illumination means for irradiating illumination light; and a natural light source. a lighting window for letting in light; a light guiding member for guiding light from the illumination means and the lighting window to the forehead of the pentaprism; and a selection for selectively transmitting light from the light guiding member into the pentaprism. It is characterized by comprising a transmitting means and a plurality of display bodies each having a mirror surface formed on the matte surface at an angle such that a part of the irradiated light transmitted through the selectively transmitting means is guided to an eye point. display observation device. 2. The display object observation apparatus according to claim 1, wherein the illumination means is turned on when the outside light measured by the photometry means becomes less than a preset brightness. 3. The display object observation apparatus according to claim 1, wherein the selective transmission means is a display outside the viewfinder field of view. 4. The selective aperture means is characterized in that when displaying outside the viewfinder field of view, the transmission area is made smaller than when displaying within the viewfinder field of view.
The display object observation device according to claim 3.