Movement detecting device

Details Movement detecting device Movement detecting device

1990-01-17

1991-11-12

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

G01D 534

Patent

active

050650122

ABSTRACT:
A movement detecting device having a light transmitter 44 and a spaced light receiver 46, with a moving plate 32 containing slit apertures therein being positioned between the transmitter and receiver for interrupting the light path between the transmitter and the receiver in dependence upon the motion of the moving plate. So as to improve the clarity of light detection, stationary apertured plates 56U, 56D are unitarily formed and are positioned on respective sides of the moving plate and adjacent a respective one of the transmitter or receiver. The stationary apertured plates 56U, 56D may be formed from a single sheet of material (FIG. 18), or from two separate sheets connectingly joined by a flanged pin (FIG. 12), or a combination thereof. The unitarily formed stationary apertured plates 56U, 56D may be directly molded into a support housing (38, 60, 62 in FIG. 8) with locating holes 64, 66 for the light transmitter 44 and light receiver 46, or may be formed in a molded sub assembly (FIG. 5) prior to moulding into a support housing (FIGS. 4 and 7).

REFERENCES:
patent: 3770971 (1973-11-01), Somerset
patent: 3886354 (1975-05-01), Swiden
patent: 4492861 (1985-01-01), Kebschull et al.
patent: 4536649 (1985-08-01), Kozai et al.
patent: 4628200 (1986-12-01), Tinios

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