Optical touch panel

Abstract

An optical touch panel is provided which permits highly accurate detection without cost increase. Light emitting optical waveguide cores (1) are provided in one of opposite side portions located on opposite sides of a detection area, and light receiving optical waveguide cores (2) are provided in the other side portion. Light beams are emitted from distal ends of the light emitting cores (1) disposed along an inner edge of the one side portion, and received on distal ends of the light receiving cores (2) disposed along an inner edge of the other side portion, whereby an optical lattice is defined on the detection area for detection of a touch position. The detection area includes a higher resolution detection portion (S) defined by arranging distal ends of at least some of the light receiving cores (2) at a pitch (P2) that is smaller than the pitch (P1) of distal ends of the other light receiving cores (2).

Description

technical field [0001] The present invention relates to an optical touch panel using an optical waveguide. Background technique [0002] In recent years, an optical waveguide type optical touch panel with non-electric contacts and easy maintenance has been used instead of the conventional resistive film type or capacitive coupling type touch panel. In this optical waveguide-type optical touch panel, infrared rays, etc. The light (approximately parallel light) forms a grid of light in the detection area on the panel. The optical touch panel is used as an input display device for guiding device operations in cooperation with the display (image pattern, icon, etc.) on the display screen (see Patent Documents 1 to 3). [0003] Such as Figure 11 As shown in the schematic structure diagram of , in the above-mentioned optical waveguide type optical touch panel, the detection part (infrared ray transmission / reception module) for detecting the contact position of a finger or a spe...

AI Technical Summary

Problems solved by technology

[0011] However, in order to improve the overall resolution of the conventional optical touch panel in which optical lattices are formed at constant pitches as described above, it is necessary to increase the number of optical waveguide cores per unit length or increase the number of optical waveguide cores per unit area. The number of light-emitting parts and light-receiving parts will increase or complicate the size of the optical waveguide if the optical touch panel is viewed as a whole

In addition, since the number of optical waveguide cores is greatly increased, the light source for supplying light to these optical waveguide cores, the light receiving element for receiving light, and the control for controlling (computing) these elements Parts, etc., also need to adopt larger and higher-performance parts, resulting in an increase in the overall cost of the optical touch panel

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