Browse Prior Art Database

SENSITIVE OPTICAL-MECHANICAL SWITCH

IP.com Disclosure Number: IPCOM000024049D
Original Publication Date: 1979-Aug-31
Included in the Prior Art Database: 2004-Apr-02
Document File: 2 page(s) / 173K

Publishing Venue

Xerox Disclosure Journal

Abstract

In present copying machines, most of the paper sensors are mechanical switches activated by lever arms from 25 to 50 mm long. The mass necessary to activate the most sensitive of these switches is one or two grams (about 1000 to 2000 dynes force). Described herein is a design for an optical-mechanical switch with much higher sensitivity than commercially available switches.

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XEROX DISCLOSURE JOURNAL

SENSITIVE OPTICAL-MECHANICAL SWITCH Anthony C. Palumbo
Paul R. Spencer

Proposed Classification
U.S. Cl. 200/61.2 Int, CL HOlj 39/24

LEVER ARM

In present copying machines, most of the paper sensors are mechanical switches activated by lever arms from 25 to 50 mm long. The mass necessary to activate the most sensitive of these switches is one or two grams (about 1000 to 2000 dynes force). Described herein is a design for an optical-mechanical switch with much higher sensitivity than commercially available switches.

Referring to the figure, the activating arm is a piece of spring wire supported at one end. A small, opaque flag is bonded to the wire at a position where the flag will block off about half of the light beam of the interrupter coupler. This coupler

consists of an infrared light-emitting diode which illuminates a phototransistor across a gap.

OPAQUE FLAG

           INTERRUPTOR
COUPLER
SW!TCH
ACT VATO R

Volume 4 Number 4 july/August 1979 453

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                  XEROX DISCLOSURE JOURNAL 454 Volume 4 Number 4 July/August 1979

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