JPS5862626A - Display device in finder of camera - Google Patents

Abstract

PURPOSE:To display data partially in a high contrast and, partially in a low contrast simultaneously, by displaying characters, patterns or the like outside or inside the visual field of a finder by a liquid crystal. CONSTITUTION:The light passing through a light transmission face 3a corresponding to an information display aperture 19 of a focusing screen 3 passes through a polarizing plate 6 and a G.H (guest.host) liquid crystal 5 and is visually recogniged through this aperture 19 with a pentagonal prism 1 and an eyepiece lens 2 by a photographer. The proper-contrast pattern display of an aperture 18 for photographic visual field of the focusing screen 3 is superimposed to the object image formed on a diffusing focal plane corresponding to this aperture 18 and is seen through a finder system. These patterns 10-15 do not require a high contrast. Since a display pattern 17 outside the photographic visual field requires a high contrast, this display is obtained by the guest host type (G.H.) liquid crystal.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a display device that displays various information necessary for photographing in the camera's 71 In-gu.In particular, the display device uses a liquid crystal to display characters, patterns, etc. outside the viewfinder viewing frame or within the IK field. 7 related to display devices.

Conventionally, shooting information was displayed using a liquid crystal display outside the IIW frame of the viewfinder, or in the viewfinder optical path.

Various display devices have been proposed in which a liquid crystal is placed on the lid to superimpose five desired characters, patterns, etc. into the viewfinder viewing frame.The liquid crystal used in this case is a light-transmitting type. Conventionally, T, N, 7, etc., which utilize the twisting effect of Nemadetsuta liquid crystal, have been widely used. In addition, recently, G, H, and liquid crystals using the guest Φ-host effect, in which various dye molecules are used as guests and liquid crystal molecules are added as hosts to obtain color patterns by the rotational orientation of the dye molecules, can also be used for display. is known as 〒J, i! When various information is patterned within the 7-fi/gu of the camera using a crystal plate or a liquid crystal plate, the contrast of the display pattern is required to be high when displaying outside the viewing frame, and on the contrary, when displaying outside the viewing frame, Since the Ingies display pattern does not require a very large contrast, it is necessary to change the structure of the liquid crystal display panel.

Now, when considering the case where the above-mentioned viewfinder display is performed using a guest-host lid liquid crystal, in order to obtain sufficient contrast necessary for display outside the field of view, it is common to use a polarizing plate even for G, H, and type liquid crystals. One polarizing plate is used.Thus, using this ideal polarizing plate, only 50% of transmitted light can be obtained, and the field of view of the finder becomes dark. In order to eliminate this light loss, if only a G or H61ll crystal plate is used without using a polarizing plate, the display within the field of view will have appropriate contrast and look good, but the display outside the field of view will not have sufficient contrast. This had the disadvantage that it was hard to see and difficult to see.

The purpose of the present invention is to obtain an in-finder liquid crystal display device that eliminates the drawbacks of the conventional devices as described above.
This constitutes a liquid crystal display device in which g-space display is obtained and display outside the field of view provides clear information display with high contrast.The present invention will be explained in detail below with reference to Figure MK.

No. 3 is a schematic diagram showing an embodiment of the display device in the finder according to the present invention III. In the figure, 1 is a pentaprism, 2 is an *a lens, and 3 is a focus plate provided below the pentaprism. Its lower surface is Fresnel-finished, and part 3a of the diffused focal plane in the upper figure is a transparent surface in order to brighten the display area outside the field of view. With the viewing frame provided between j
As shown in Figure 1F2, an aperture 18 for photographing field and an aperture 19 for information display are formed. be. A polarizing plate 6 is provided between the focus plate 3 and the liquid crystal 5, and is provided to fit the information display aperture 19. 7 is a liquid crystal drive circuit, and 8 is a detection, calculation, and control circuit for exposure, distance measurement, etc.

FIG. 112 is a display pattern diagram showing an example of the display in the finder of the present invention, and 10 to 15 are examples of super invoice display patterns in the field of view, and this portion does not require much contrast. 10 is the distance measurement area mark, '11 is the distance measurement display, O is the focus, Δ is the front and back focus state, 012 is the exposure compensation mark,
15 and 14 are out of range warning, 15 is impossible to release,
This is a display pattern of a prohibition warning. 17 is an information display pattern outside the photographic field of view, which shows Mae Air, display M, and aperture value.

It is formed with a pattern that indicates the completion of charging of the strode. These displays outside the field of view need to have high contrast, so as shown in Figure #11, the polarizing plate 6 is removed (high contrast is applied only to the information display section 17 of the host type liquid crystal 5). This is to obtain a two-striped display. In addition, in order to prevent the end face of the polarizing plate 6 from being seen in the viewfinder, by using a configuration such as 0 or more in which light can be blocked by the field frame 4, the display within the photographing field frame can be displayed with a low chondral distortion. The super-in-booth display will not be too obtrusive and will be bright, and the high contrast display outside the shooting field of view will provide a clear and easy-to-see display, allowing you to see each image clearly when in focus.

In the figure, the light that has passed through the light transmission 1i5a corresponding to the information display aperture 19 of the focusing plate 3 is reflected by the polarizing plate 6, G, and H.

Back through the liquid crystal 5 and through the information display port 19, the pentaprism 1 and I! The camera only sends a message 2- and is visually recognized by the photographer. At this time, if the subject is dark, the information display may be difficult to see.In such a case, you can use a known illumination device (not shown) or external lighting to brighten the field of view of the 0 focal plate 3. The object image produced in the diffuse focal plane corresponding to the field aperture 18 is superimposed with a pattern/representation of the appropriate contrast in the photographic field aperture 18.
It is emitted from the Gesu 2 through the eye optical system,
This allows the photographer to see a superimposed image of the phi-yf-image and the display pattern.

Figure 3 is a route map showing another embodiment of the present invention.
By using H, fi crystal 5 and using two-phase G, H, @ crystal 5,5' for the high contrast display area (outside the viewing frame), the case shown in Figure 1 can be obtained without using a polarizing plate. It is designed to achieve the same effect as.

FIG. 4 is an enlarged cross-sectional view of a one-phase G, H6 liquid crystal and a two-phase G, H, liquid crystal. In the figure, LC#i liquid crystal molecules,
D is a dye molecule, and in the case of two-phase G, H and liquid crystals, absorption occurs in both this and horizontally polarized light, resulting in a display with high punctuality, but in the case of one-phase G, H, liquid crystals In this case, either the vertical or horizontal direction passes without convergence, resulting in a low contrast display.

In addition, high; n) last display and low contrast) display・1.
・.

It goes without saying that this can also be obtained by using liquid crystals of 〒, N, #eve and changing the degree of polarization of the polarizing plate.

As explained in detail in the embodiments above, in the viewfinder display device according to the present invention, it is possible to simultaneously obtain a partially high-consistency display and a low-consistency display using a liquid crystal display. In particular, it is possible to easily construct a display device suitable for use as a display in the viewfinder of a 7-eye lens camera, and its effects are great.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing an embodiment of the display device in the viewfinder according to the present invention. Fig. 2 is a display pattern diagram showing an embodiment of the display in the finder according to the present invention. A route map showing an embodiment, and Figure 114 is an enlarged cross-sectional view of one-phase and two-phase G, H, and liquid crystals used in the device of the present invention. 5
−・−・Focus plate, 4・・Field frame, 5・Scourge G, HJ crystal, 6・◆・Polarizing plate, 7・・Liquid crystal drive rod circuit, 80・・・Control circuit for exposure, distance measurement, etc., 10 to 15
...Display pattern within the field of view frame, 17...Display pattern outside the field of view frame, 18...Aperture for photographing viewing, 19
Fist: An opening for information display. Patent applicant: Life Yanon Co., Ltd.

Claims (1)

[Claims] (1) Shooting information is displayed on a liquid crystal display in the finder of the camera;
In a viewfinder display device for displaying patterns, etc., a polarizing means is provided in combination with the front liquid crystal to make the contrast of the display higher in some parts than in other parts, and in the display panel. A display device in a camera finder, characterized by forming a display mode of a high contrast part and a low contrast part. Camera viewfinder circle display □ device. (6) In the product described in claim (1), 27 high-column portions of the display pattern are replaced by a two-phase guest host).
A display device in the viewfinder of a camera that is composed of a board crystal.