Device for detecting the transit of a mobile member through a re

Details Device for detecting the transit of a mobile member through a re Device for detecting the transit of a mobile member through a re

1988-02-23

1989-09-19

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250214C, G01N 2186

Patent

active

048684023

ABSTRACT:
The device comprises a photo-electric detection sensor (4), a luminescent diode (1) that produces a light beam for illuminating the detection sensor (4) and an opaque element (5) that is formed with an opening (6) and is mechanically connected to a mobile member (A), such as a hand of a timepiece, whose transit through a reference position is to be detected. The opaque element (5) and the opening (6) are so disposed as to allow the light beam to travel on or to be interrupted depending on whether the mobile element (A) is in its reference position or in another position. The device further comprises a comparator (13) which compares the signal produced by the detection sensor (4) with a reference signal produced in response to a signal supplied by a reference photo-electric sensor (9) that is manufactured on the same plate of semi-conductor material (3) as the detection sensor (4) and is so disposed as to receive no light.

REFERENCES:
patent: 3421009 (1969-01-01), Caruthers
patent: 3931513 (1976-01-01), Germain
patent: 4420263 (1983-12-01), Besson et al.
patent: 4593194 (1986-06-01), Grahama et al.
patent: 4659930 (1987-04-01), Johnson et al.
Patent Abstracts of Japan, vol. 9, No. 217 (p-385) [1940], 4 Sep. 1985; & JP-A-60 76 612 (Matsushita Denko K.K.) 01-05-1985.

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