JPS6343457Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a display device for a camera, and more particularly, to a display device for a camera that displays an exposure value using a display element provided in a viewfinder.

2. Description of the Related Art Camera display devices that use light emitting diodes in the viewfinder to digitally display exposure values are already well known. Also, recently, a device in which the exposure value is digitally displayed using a display element made of liquid crystal has been proposed.

Compared to light emitting diodes, liquid crystals have the advantage of requiring far less current consumption when used as display elements, but have the disadvantage that they become difficult to see when the surroundings are dark. For this reason, some display devices are equipped with a lamp near the liquid crystal display element to illuminate the display element when the display element is dark and difficult to see, but such display devices are cumbersome to operate. However, the current consumption increases, causing premature battery depletion, making it difficult to see the subject image, and furthermore, in the case of a camera equipped with a light receiving element for photometry in the viewfinder, the above-mentioned illumination may This had the disadvantage that the exposure value changed accordingly.

The purpose of the present invention is to provide a display element consisting of a liquid crystal and a display element consisting of a light emitting diode in the viewfinder in order to eliminate the above-mentioned disadvantages. To provide a display device for a camera on which values are displayed.

The present invention will be explained below with reference to illustrated embodiments.

FIGS. 1A and 1B show a display device showing an embodiment of the present invention. The display device 1 includes a first display element 2 in which a 7-segment display section is formed by a transmissive liquid crystal, a second display element 3 in which a 7-segment display section is formed by light-emitting diodes, and a second display element 3 in which a 7-segment display section is formed by light-emitting diodes. 1. 2nd
It is composed of a transparent light guide element 4 disposed between the display elements 2 and 3, and a display switching light receiving element 5 disposed on the first display element 2 with its light receiving surface facing down. .

The first and second display elements 2 and 3 are laminated and integrally formed with the flat light guide element 4 sandwiched between them, with the display portion facing upward. The shape of the first display element 2 is such that its left side protrudes and has a larger width than the second display element 3 due to the arrangement of the light receiving element 5 at a position where no display section is formed.
The light guide element 4 is formed to have the same width as the first display element 2, and is longer than the first and second display elements 2 and 3 in the vertical direction. A protruding edge 4a for allowing the light to enter is shaped to protrude from between both display elements 2 and 3. As shown in FIG. A semi-transparent surface 6 inclined at approximately 45 degrees is formed to be long in the lateral direction so as to face the upper edge 4a.

For example, as shown in FIG. 3, the display device 1 is placed above the viewfinder image frame 7 and near the subject image plane, and only the display section is observed by the photographer. It's becoming like that. External light is introduced into the protruding edge 4a of the light guide element 4 from the direction of arrow a, as shown in FIGS. 1 and 2. Therefore, a part of the light introduced into the light guide element 4 is reflected by the semi-transparent surface 6 in the light guide element 4 and enters the first display element 2 from the back surface, illuminating the display part of the element 2. I'm starting to do that. Also,
The light reflected by the semi-transparent surface 6 at a position to the left of the display section of the first display element 2 passes through the display element 2, enters the light-receiving surface of the light-receiving element 5, and is photometered by the light-receiving element 5. It's becoming like that. Therefore, when the amount of external light entering the light guide element 4 in the direction of arrow a from the protruding edge 4a of the light guide element 4 is large, the second
As shown in the figure, the amount of light reflected by the semi-transparent surface 6 and transmitted through the first display element 2 is large, and conversely, when the amount of external light is small, the amount of light transmitted through the first display element 2 is also large. few. The transmitted light of the first display element 2 is received by the display switching light-receiving element 5 disposed on the first display element 2 with its light-receiving surface facing downward. An output corresponding to the amount of transmitted light is extracted from. Therefore, in this display device 1, the level of the output of the light receiving element 5 is determined, and if the output level of the light receiving element 5 is higher than the set value, the output level of the light receiving element 5 is lower than the set value. In this case, each of the second display elements 3 is made to display the exposure value.

Next, the operation of displaying exposure values in the display device configured as described above will be explained with reference to the block diagram of the electric circuit shown in FIG.

The output of the display switching light receiving element 5 is guided to a level determiner 8. The level determiner 8 determines whether the external light irradiated onto the first display element 2 is
It is determined whether the amount of light is sufficient for the photographer to identify the liquid crystal display section. The output of this level determiner 8 is guided to a selector 9.

On the other hand, the output of a photometric light receiving element 10 placed in the camera body for measuring the amount of light from a subject is amplified by an amplifier 11, guided to a logarithmic compressor 12 for logarithmic compression, and then sent to an A-D converter. At step 13, the digital value is converted into a digital value and introduced to an exposure time calculator 14. The calculator 14 calculates the photometric output together with the film sensitivity, aperture value, and other set values from the exposure information setter 15 to calculate the appropriate shutter speed in seconds. This appropriate shutter speed is sent to the selector 9.

The output of the appropriate shutter speed in seconds led to the selector 9 is sent to the level determiner 8 by the selector 9.
can be switched according to the output. That is, when the output of the light receiving element 5 is equal to or higher than the level set by the level determiner 8, the output of the arithmetic unit 14 guided to the selector 9 is guided to the 7-segment decoder driver 16 for liquid crystal. Same driver 16
and when the output of the light receiving element 5 is below the level set by the level determiner 8, the output of the arithmetic unit 14 guided to the selector 9 is sent to the 7-segment decoder for light emitting diode. The user is guided by the driver 17 and operates the driver 17. When the decoder/driver 16 operates, the segment display section of the liquid crystal of the first display element 2 displays the appropriate shutter speed in seconds as a digital value, and when the decoder/driver 17 operates, the second display The segment display section of the light emitting diode of element 3 similarly displays the proper shutter speed in seconds. FIG. 1A shows a state in which the segment display section of the liquid crystal of the first display element 2 displays that the shutter speed is, for example, 1/125 second. At this time, since the amount of light transmitted through the display element 2 is large, the digitally displayed numerical value can be clearly read in the viewfinder. Further, FIG. 1B shows the second display element 3
In this state, the segment display section of the light emitting diode displays that the shutter speed per second is, for example, 1/8 second. At this time, the amount of light transmitted through the first display element 2 is small and the decoder driver 1
Since element 6 is inactive, element 2 does not display any display and becomes transparent. Therefore, the light from the light emitting display section of the second display element 3 passes through the first display element 2, as shown by the dotted arrow in FIG. The digitally displayed values can be read clearly.

In the above embodiment, the display of the first display element 2 and the second display element 3 is switched only depending on the level of light that passes through the first display element 2 and enters the light receiving element 5. I try to do it, but
In addition to this, the display may also be switched when the exposure time is equal to or greater than a predetermined value. For example, the second display element 3 may display a long time of 1/60 seconds or more to serve as a camera shake warning, or the display may be switched at a long time of 1 second or more. The exposure time length may be identified in this way.

As described above, according to the present invention, the exposure value is adjusted by the first display element made of liquid crystal in bright places, and by the second display element made of light emitting diodes in dark places. Since the exposure value is displayed clearly, you can always read the clearly displayed exposure value, there is no wasted current consumption, and it also has excellent effects such as being able to be configured easily and compactly. do.

[Brief explanation of the drawing]

1A and 1B are perspective views of a display device showing an embodiment of the present invention, in which FIG. 1A shows a state where a display is made by a first display element, and FIG.
Indicates the state displayed by the display element of
FIG. 2 is a side view of the display device shown in FIG. 1 above;
FIG. 3 is a front view of a finder image having the display device shown in FIG. 1, and FIG. 4 is a block diagram showing an example of the electric circuit of the display device of the present invention. DESCRIPTION OF SYMBOLS 1... Display device, 2... First display element made of liquid crystal, 3... Second display element made of light emitting diode, 4... Light guide element, 5...
...Display switching light receiving element, 6...Semi-transparent surface, 14...
...Exposure seconds calculator.

Claims (1)

[Scope of Claim for Utility Model Registration] A flat light guide element, a liquid crystal display panel integrally disposed in close contact with the upper surface of the light guide element, and a liquid crystal display panel integrally disposed in close contact with the lower surface of the light guide element. a light emitting diode display board disposed in the light guide element and visible through the light guide element and the liquid crystal display panel; a semi-transmissive surface that reflects the external light and illuminates the liquid crystal display panel; a light receiving element that measures external light incident on the light guide element; A display device for a camera, comprising: a control circuit that operates the light emitting diode display panel and operates the light emitting diode display panel when a predetermined value is not reached.