Timing device and method of manufacture therefor

Details Timing device and method of manufacture therefor Timing device and method of manufacture therefor

1994-09-27

1996-04-16

Ryan, Patrick J.

Stock material or miscellaneous articles

Structurally defined web or sheet

Discontinuous or differential coating, impregnation or bond

428209, 428913, 356 25, 356 28, B32B 900

Patent

active

055080880

ABSTRACT:
Disclosed are a timing device for controlling machine tools, handling equipment or other servomechanical elements and a method of manufacture. The timing device comprises a timing control element which includes a plurality of transparent windows and opaque windows arranged in a selected pattern and a reflective means disposed behind the transparent and opaque windows for reflecting light. A transmitter emits light toward the timing control element. The device further comprise means for operating the timing control element to controllably select one of the transparent and opaque windows to be in the path of the emitted light. The emitted light propagates through one of the transparent windows, and is reflected by the reflective means only when the selected window is transparent. A receiver, disposed adjacent to the transmitter, generates an electrical signal in response to the reflected light.

REFERENCES:
patent: 3881184 (1975-04-01), Koepcke
patent: 4343012 (1982-08-01), Knapp
patent: 4376609 (1983-03-01), Bohman
patent: 4400069 (1983-08-01), St. Pierre
patent: 4603984 (1986-08-01), Ullenboom
patent: 4644156 (1987-02-01), Takahashi et al.
patent: 4661697 (1987-04-01), Takahashi et al.
patent: 4783679 (1988-11-01), Anzai
patent: 4797711 (1989-01-01), Sasada
patent: 4806751 (1989-02-01), Abe et al.
patent: 5282187 (1994-01-01), Lee

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