JPH06250264A - In-finder display device for single-lens reflex camera - Google Patents

Abstract

PURPOSE:To attain the simplification of structure, reduction in cost and the increase of space efficiency, in an in-finder display device for a single-lens reflex camera capable of switching a photographic picture frame size in a finder by a liquid crystal display. CONSTITUTION:A liquid crystal device 1 is arranged between a penta-prism 6 and a focusing screen 5 integrally provided with a photographic picture frame switching display part la in tame finder and a photographing information display device 1b, a photographic picture frame switching display and a photographing information display are executed by one liquid crystal display device and the photographing information display is led to the penta-prism 6 through a prism 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display in a viewfinder of a single-lens reflex camera which uses a liquid crystal display device to perform an aspect ratio switching display.

[0002]

2. Description of the Related Art Conventionally, a photographer has a function of arbitrarily selecting a normal photographing screen size (first photographing screen size) and a predetermined photographing screen size (second photographing screen size) different from the normal photographing screen size. In the single-lens reflex camera, when the photographer selects the photographing in the second photographing screen size, the photographer recognizes the photographable area in the second photographing screen size, and the photographing without failure is performed. As can be seen, as shown in FIG. 4, the boundary line 42 indicating the photographable area 41 in the second photographing screen size is displayed in the viewfinder. FIG. 5 shows a cross section of the single-lens reflex camera having the in-viewfinder display shown in FIG.

Photographable area 4 in the second photographing screen size
The boundary line 42 indicating 1 is displayed by forming fine grooves on the surface of the focusing screen 51 of FIG. 5, or by coating the surface to diffuse or block light.

However, this is annoying because the boundary line 42 is always displayed even if the photographer is photographing with a normal photographing screen size, and the photographer is currently selecting which photographing screen size. It was difficult to know what was happening in the viewfinder.

Therefore, there has been proposed a method of providing a liquid crystal display device 62 for switching the photographing screen size between the focusing screen 61 and the pentaprism 67 as shown in FIG. FIG. 7 and FIG. 8 respectively show the state in the viewfinder displaying the photographable area when the normal photographing screen size and the second photographing screen size are selected, and the liquid crystal for displaying the photographing information is outside the field of view. The contents of the display device 63 are displayed.

[0006]

However, in the above-mentioned conventional example, there is a drawback that the cost is increased because two kinds of liquid crystal display devices for displaying the photographing screen size and displaying the photographing information are required. . In addition, a connector for electrically connecting the drive driver to each liquid crystal display device is required, which causes further cost increase and at the same time causes a reduction in space efficiency and a complicated mounting layout. Was becoming.

[0007]

According to the present invention, a single liquid crystal display device is provided between a pentaprism and a focusing screen for displaying a photographing screen size switching display and a photographing information display in a viewfinder of a single-lens reflex camera. By displaying it, the cost is significantly reduced and the space efficiency is improved.

[0008]

FIG. 1 is a view showing an embodiment of the present invention,
1 is a liquid crystal display device, 2 is a back light LED, 3 is a connector holder, 4 is a flexible printed circuit board, 5
Is a focusing screen, 6 is a pentaprism, and 7
Is a prism, and 8 is a viewfinder eyepiece.

The liquid crystal display device 1 is placed between the focusing screen 5 and the pentaprism 6 substantially parallel to both.

The lens incident light guided by a mirror (not shown) passes through the focusing screen 5, and then is guided to the viewfinder eyepiece 8 through the pentaprism 6 1a corresponding to the photographable area of the liquid crystal display 1. Be freaked out.
The portion 1a is a positive type liquid crystal display portion, which is in a transparent state when a normal voltage is not applied.
Further, a transparent electrode having an aspect ratio substantially equal to that of a predetermined photographing screen size other than the normal photographing screen size is provided in the 1a portion so that when a voltage is applied, a contrast is provided with the transparent portion.

On the other hand, the portion 1b is a negative type liquid crystal display portion, which is normally opaque when no voltage is applied. In addition, in the 1b portion, information regarding exposure and various photographing information indicating the operating state of the camera are provided by a transparent electrode, and a necessary picture or segment becomes transparent by applying a voltage, and the backlight LE from the back surface is displayed.
Only the portion of the light D2 that has transmitted the light is guided to the pentaprism 6 by the prism 7 and can be viewed by the photographer.

FIG. 2 shows the inside of the finder as seen from the finder eyepiece 8. Now, the camera is set to a normal shooting screen size, and is in the transmissive state 1a with an aspect ratio almost equal to that.

FIG. 3 shows a state in the finder when the camera is set to a predetermined photographing screen size other than the normal photographing screen size. The transparent portion 1a having an aspect ratio substantially equal to the set photographing screen size is left, and the other regions are in the light-shielded state 1c.

The portion 1c may be in a completely light-shielded state, or may be in a semi-transmissive state so that the states of the upper and lower objects can be seen. The contrast of 1c may be arbitrarily selected by the photographer, or the contrast of 1c may be automatically changed according to the brightness of the subject or the external environment.

[0015]

As described above, the image-taking screen size switching display and the image-taking information display in the viewfinder of the single-lens reflex camera are displayed by one liquid crystal display device provided between the pentaprism and the focusing screen. As a result, it is possible to reduce costs by reducing the number of parts.

Furthermore, since only one connector portion is required for electrically connecting each liquid crystal display device and the driver for driving, the number of parts is greatly reduced, and accordingly, space efficiency is improved and the mounting layout is improved. Since it is compact, it has the effect of helping to downsize the camera.

[Brief description of drawings]

FIG. 1 is a diagram showing a state where a liquid crystal display device embodying the present invention is incorporated into a camera.

FIG. 2 is a diagram showing a display state in a finder when a normal screen size is selected in the embodiment of FIG.

FIG. 3 is a diagram showing a display state in a finder when a second screen size is selected in the embodiment of FIG.

FIG. 4 is a diagram showing a display example in a viewfinder of a conventional camera.

5 is a cross-sectional view of the conventional camera of FIG.

FIG. 6 is a sectional view of a conventional camera.

7 is a diagram showing a display state in a viewfinder of the camera of FIG.

8 is a diagram showing a display state in a finder when the second screen size of the camera of FIG. 6 is selected.

[Explanation of symbols]

1 ... Liquid crystal display device 2 ... Backlight LED 3 ... Connector holder 4 ... Flexible printed circuit board 5 ... Focusing screen 6 ... Penta prism 7 ... Prism 8 ... Finder eyepiece

Claims (1)

[Claims] 1. A single-lens reflex camera capable of selectively switching a plurality of shooting screen sizes, wherein a shooting screen size switching display and a shooting information display in a viewfinder are displayed on a single liquid crystal display device. In-view display device for SLR cameras.