ROTATIONAL POSITION DETECTOR, HAND POSITION DETECTOR USING THE SAME, AND ELECTRONIC TIME-PIECE USING HAND POSITION DETECTOR

摘要

PROBLEM TO BE SOLVED: To restrain a thickness to the minimum, and to reduce the possibility of an erroneous operation.;SOLUTION: In this rotational position detector for detecting rotational positions of hands in an electronic time piece, a light emitting element 81 and a photoreceiving element 91, and a reflection face R are arranged to sandwich detected parts 14, 24, 34 for detecting the rotational positions therebetween, light Bi from the light emitting element 81 is made incident obliquely, and reflected light Br reflected obliquely is detected by the photoreceiving element 91. The light emitting element 81 and the photoreceiving element 91 are mounted on a circuit board 71 facing to the reflection face R in one main face 72 side, and light shielding walls 85, 95 for preventing the intrusion of stray light from the light emitting element 81 into the photoreceiving element 91 are formed in the peripheries of the light emitting element 81 and the photoreceiving element 91. The shielding walls 85, 95 serves as sealing frames for a sealing resin for sealing the light emitting element 81 and the photoreceiving element 91.;COPYRIGHT: (C)2004,JPO