Title: Light projector and detector unit

Abstract: The light beam projector and the directive light receiver of a light barr intrusion detector are mounted side by side on a common mounting body which is angularly adjustable in a fixed casing, so as to direct the projected light for maximum reflection to the receiver by a remote mirror. A light emitting diode is provided as a visible indicator on or near the casing or the mounting and responds to the photosensitive element of the receiver through an intermediate amplifier, so that its brightness enables the effectiveness of the directional adjustment to be easily observed.

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Inventors: Schmid, August (Schwerzenbach, CH)

Application Number: 550263
Filing Date: 1975-02-18
Publication_date: 1977-03-22
Assignee: Patentverwertungs-und Finanzierungsgesellschaft Serania AG (Glarus, CH)
Primary Class(es): 250/221 250/239, 340/600
Other Classes:
US Patent Ref:

3041461	Jun, 1962	Lindemann et al.	356/199.
3578978	May, 1971	Laurent	250/221.
3619629	Nov, 1971	Matthews	250/221.
3816745	Jun, 1974	Primm et al.	250/221.

Other Refs:
Primary Examiner: McGraw, Vincent P.
Assistant Examiner:
Attorney: Woodward; William R.