US3858043A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light barrier screen
Assignee: Erwin Sick GmbH Optik Elektronik
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Filing: 1973-09-20
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Granted: 1974-12-31
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Expires: 1993-09-20
Abstract
Abstract A light barrier screen having a plurality of sequentially arranged light sources which emit a light beam occupying a given predetermined area, and a photosensitive receiver which registers the intensity of the light beam coming out of the predetermined area and emits an output signal upon a given decrease in intensity of one or more light beams, said individual light sources being introduced through a single energy source in rapid temporal sequence.
Inventors
- 👤 Erwin Sick
- 👤 Ernst Gass
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 01:58
CPC Classifications
F; F16; F16P; F16P3/00; F16P3/12; F16P3/14; F16P3/144; G; G01; G01V; G01V8/00; G01V8/10; G01V8/20; G01V8/22; G08; G08B; G08B13/00; G08B13/18; G08B13/181; G08B13/183; G08B13/184
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
108 words
A light barrier screen having a plurality of sequentially arranged light sources which emit a light beam occupying a given predetermined area, said individual light sources being introduced through a single energy source in rapid temporal sequence, the light beams coming out of said area being optically unified upon a single measurement-photoreceiver which registers the intensity of the light beams coming out of said area and emits an output signal upon a given decrease in intensity of one or more light beams, and a single evaluation electronics connected to said measurement-photoreceiver for the evaluation of electrical signals actuated by the individual light beams coming out of said area.
Claim 2
Dependent Claim
108 words
A light barrier screen having a plurality of sequentially arranged light sources which emit a light beam occupying a given predetermined area, said individual light sources being introduced through a single energy source in rapid temporal sequence, the light beams coming out of said area being optically unified upon a single measurement-photoreceiver which registers the intensity of the light beams coming out of said area and emits an output signal upon a given decrease in intensity of one or more light beams, and a single evaluation electronics connected to said measurement-photoreceiver for the evaluation of electrical signals actuated by the individual light beams coming out of said area.
Claim 3
Dependent Claim
43 words
Light barrier screen in accordance with claim 1, wherein comparison-beams emitted by each of the light sources are unified through the same optics as the measurement beams upon a single comparison-photoreceiver which is hooked up to a comparison circuit provided in the evaluation-electronic.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-30 | 1978-07-01 | 1978-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-30 | 1982-07-01 | 1982-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-30 | 1986-07-01 | 1986-12-31 | $7700.00 | Window Closed / Lapsed |