JPS62175349U - - Google Patents

Description

[Brief explanation of the drawing]

FIG. 1 is a front view of main parts showing one embodiment of the coordinate input device according to the present invention, FIG. 2 is a front view of main parts showing another embodiment of the coordinate input device according to the present invention, and FIGS. Figure 5 is for explaining an example of a conventional coordinate input device, Figure 3 is a perspective view showing the coordinate input device attached to the front of the display screen, and Figure 4 is a main part on the light receiving element side. Cross-sectional view, Figure 5 is a back view showing the internal structure of the coordinate input device, Figure 6 is a front view of the main part showing a conventional proposal that takes measures to prevent malfunctions in the infrared filter, and Figure 7 is a coordinate system using a light-shielding holder. FIG. 8 is a cross-sectional view of a main part of the input device on the light-receiving element side, and a perspective view showing the internal shape of the light-shielding holder. 2... Opening portion, 3... Display device, 3a... Display surface, 4... Light emitting element, 5... Light receiving element, 7... Substrate, 7a... Convex body, 8... Light shielding plate, 9... ...Infrared filter (visible light exclusion filter), 11... Optical path, 13... Light shielding holder, 13a... Recess.

Claims (1)

[Claims for Utility Model Registration] (1) A light emitting device consisting of a frame with a substantially rectangular opening formed in the center and a plurality of light emitting elements arranged in parallel along two sides of the opening of the frame. A device example, a light-receiving element row consisting of a plurality of light-receiving elements arranged in parallel on two sides facing the element, and visible light defining a periphery of the opening and facing the light-emitting element and the light-receiving element. forming an optical path on the front side of the display surface of the display device between the light emitting element and the corresponding light receiving element via the visible light exclusion filter, and detecting a position where this optical path is blocked. In a photo-detection type coordinate input device that inputs a coordinate position on a display surface using At a position equidistant from the light-emitting element and the corresponding light-receiving element on the surface of the exclusion filter, light incident from the light-emitting element off a predetermined optical path is prevented from being reflected in the direction of the light-receiving element. A coordinate input device characterized in that it is provided with means for preventing reflection outside the filter. (2) The coordinate input device as set forth in claim (1) of the utility model registration, characterized in that a convex body is provided at the position of the member as the filter reflection prevention means. (3) The coordinate input device as set forth in claim (1) of the utility model registration, characterized in that a recess is provided at the position of the member as the means for preventing reflection outside the filter. (4) The coordinate input device as set forth in claim (1) of the utility model registration, characterized in that a coating with high light absorption is applied to the relevant position of the member as the filter external reflection prevention means. .