| 摘要 |
An optical scanning-type touch panel comprising: an optical scanner (15, 18) for angularly scanning light in a plane substantially parallel to a predetermined region (10); and an optical transceiver (11-14, 16, 17) for projecting light onto said optical scanner and receiving part of scanning light of said optical scanner; for measuring a scanning light cut-off position, which is produced in said predetermined region by an indicator, based on a light receiving output of said optical transceiver (11-14, 16, 17) that corresponds to a scanning angle. The optical scanner (15, 18) and optical transceiver (11-14, 16, 17) are mounted on a single base body (19) as one unit. The optical transceiver comprises a light emitting element (11), a collimation lens (12) for changing light from the slight emitting element into parallel light, and an aperture (16a) for limiting a size of light from the collimation lens (12) the aperture being formed in two or more stages.
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