Timing device for controlling machinery and other servomechanica

Details Timing device for controlling machinery and other servomechanica Timing device for controlling machinery and other servomechanica

Filed on

1996-03-26

Date issued

1997-09-30

Examiner

Westin, Edward P.

Patent Class

Radiant energy

SubClass

Photocells; circuits and apparatus

SubSubClass

Optical or pre-photocell system

Other Related Categories

250230, 25023118, G01D 530

Type

Patent

Status

active

Patent number

056728654

Description

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 having a light sensitive layer including thereon a plurality of transparent windows and opaque windows arranged in a selected pattern, a reflective means disposed behind the light sensitive layer, and a carrier material disposed behind the reflective means. 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: 3965349 (1976-06-01), Jespersen
patent: 3991789 (1976-11-01), Wojcikowski
patent: 4092533 (1978-05-01), Ohsako et al.
patent: 4644156 (1987-02-01), Takahashi et al.
patent: 4661697 (1987-04-01), Takahashi et al.
patent: 4731638 (1988-03-01), Cherian
patent: 4757196 (1988-07-01), Yamada et al.
patent: 4806751 (1989-02-01), Abe et al.
patent: 5508088 (1996-04-01), Braun

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