JPS58105738A - Indicator plate for sight capacity measuring apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an indicator plate used in a device for measuring visual ability, and is an indicator that can electrically measure the brightness of indicators such as Arabic numerals, alphabet letters, circles, etc. It is intended to provide a board.

Conventionally, as an index board which is a main component of a visual ability measuring device, the said index is drawn on a white board using an appropriate paint, and the eyes and mouth index marking surface is illuminated from both sides 11111 of the white board.
It is customary to display indicators to the subject.

In this indicator board, there are only two brightnesses of the indicator surface: uN' (on) and 0FF (off). In addition, the method of displaying the KA4-Ko is that a rotary plate with indicators written on it is driven mechanically, and one specific indicator is displayed from one window, and an indicator board containing multiple indicators is Obviously, the rotating plate must be made unnecessarily large. In visual ability measurement in recent years, not only the brightness of the index is changed, but also the display period of the index is being changed. At present, no indicator board or indicator display method has been found that meets this request.

The present invention aims to provide an index plate for a visual ability measuring device that solves the above problems. The structure and function of the indicator plate according to the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view for explaining the conceptual structure and method of use of the index plate according to the present invention, in which 1 is a light-transmitting piezoelectric ceramic, and 2 is a PLZT (lead-r atomide-based translucent piezoelectric ceramic). A solid flat plate that has a drowsy optical effect and has electrodes on its front and back principal surfaces, as represented by (common abbreviation), and a polarizing plate that has mutually orthogonal polarizing axes sandwiching the front and back principal surfaces of this flat plate. Each of these refers to an indicator plate unit in which a plurality of solid-state optical shutter elements consisting of are dyed and arranged to display the shape of an indicator. What is meant by FIG. 1 is that when each of the optical shutters constituting the second index is selectively driven,
When light enters from the right side of 2, the back (left side) of 2
If a reflector is provided at 2 and the light enters from the left side of 2,
No reflective plate is provided on the back surface of 2, and the human eye can see the index formed by the transmitted light from each element of 2, as depicted at the right end of FIG.

FIGS. 2(a) and 2(b) specifically illustrate the configuration of the above-mentioned Hikari/Yanota aggregate unit.

Figures 2 (a) and (b) both show 7-segment (or sun-shaped) type display elements used for numerical display.
,) t-o However, in the figure, the support of each segment and the polarizing plate are omitted. In the figure, 3 is shown in Figure 2 (
Both a) and (b) mean a flat plate of a solid-state electro-optic effect element, and the subscripts (1 to 7; 1"% 7') correspond to the numbers of each segment. 4 and 4' respectively refer to the front and back of the flat plate 3. The comb-shaped electrodes provided at mirror positions with respect to the flat plate 3 in the main direction, 5 and 5' respectively mean transparent flat plate electrodes provided on the seedling surface of the flat plate 30.Segment numbers 1 and The illustrations of the above-mentioned electrodes are also omitted except for 1'.
．． Although the power supply system to (5') is completely omitted, the voltage is applied to each segment through this system, along the plane 30 of the flat plate in the case of Figure 2 (-), and along the plane of the flat plate 30 in the case of Figure 2 (b). In this case, if it is selectively applied along the thickness direction of the flat plate 3, from the relationship between the electric field and the traveling direction of the light, in the case of Figure 2 (-), the solid state drowsiness optical effect of the transverse effect causes 1g2 Figure In the case of (b), due to the solid-state electro-optic effect of the longitudinal effect, the selected Yanotar segment transmits the light incident on the main surface of the flat plate 3. As a result, corresponding to the above-mentioned transmitted light, as shown in Fig. 2 (aL (
In case b), an index of Arabic numerals will be displayed. Of course, the segment configuration shown in FIG.
Also indicators of geometric shapes such as circles.

It can be easily configured by changing the shape and combination of each segment. FIG. 3 specifically shows a cross-sectional view of the structure of the segment described above in the text.・The meanings of ↓, (4'), and 5° (6') are the same as in Figure 2, e, 7N:, 1:
means the polarizing plate described in However, in the electrode structure of FIG. 2(a), the polarization axes 6 and 7 are arranged diagonally with respect to the length direction of the comb-shaped electrode fingers.

The solid-state electro-optic effect represented by 1'LZT can be applied to liquid crystals,
Whether active or passive, such as light emitting diodes, fluorescent tubes, etc.
Since each display element has a very fast response, it is possible to provide an index board with a short display period, and because of the well-known voltage dependence of light transmittance, it is possible to provide Has a function. ν1 also provides an index plate with a wide variable range of brightness. It has great practical value because it eliminates problems and provides new functions required for visual ability measurement in recent years.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the main part configuration 4T for explaining the configuration and usage method of the index plate for a visual ability measuring device according to the present invention, and FIG. 2 shows a specific example of the configuration of the index plate according to the present invention. FIG. 3 is a top view of a main part and a sectional view of a main part showing a solid-state optical N-Yatter element as a component of an index plate according to the present invention. 1...Light source, 2...Index plate, 3...
...solid-state element, 4.4', 5.6'...
・Electrode, 6.7...Polarizing plate.

Claims (1)

[Claims] A plurality of solid-state optical shutter elements are arranged, each of which has an optical optical effect and is composed of a solid flat plate having electrodes on its front and back principal surfaces, and polarizing plates having mutually orthogonal polarization axes and sandwiching the flat plate,
By selectively applying a voltage to the plurality of solid-state light Yanotar elements, an index such as an Arabic numeral, an alphabetic letter, or a circle is displayed according to the transmitted light from the selected solid-state light/Yanotar element. An indicator board for a visual ability measuring device.