Alignment indicator for photoelectric scanners
US4356393A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 29, 1980 |
| Grant date | Oct 26, 1982 |
| Priority date | — |
| Expiry date | May 29, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V8/20
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A photoelectric scanner system includes photosensors (10), an amplifier (15), and a demodulator (17), and functions to produce an output signal indicative of when light signals of a predetermined intensity are being received by the photosensors. An alignment indicator control circuit (20) is connected to receive the amplified light intensity signals, and functions to produce a repetitive alignment indicating signal whose frequency is generally proportional to the intensity of the received light signal. The signals are applied to an alignment indicator which, in the preferred embodiment, is a light emitting diode, so that the LED flashes at a frequency indicative of the degree of alignment of the system, enabling an operator to accurately align the photoelectric scanning system with reference to the flash rate of the alignment indicator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.