Scanning optical system having first and second knife edge detec

Details Scanning optical system having first and second knife edge detec Scanning optical system having first and second knife edge detec

1994-02-04

1995-06-13

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356121, G02B 2610

Patent

active

054245389

ABSTRACT:
In a scanning optical system, a first light detecting body is disposed so as to be coplanar with a surface to be scanned, whereas a second light detecting body is disposed in front of the surface to be scanned. Outputs of the light detecting bodies are applied to a first rise time detecting circuit and a second rise time detecting circuit to detect rise times, respectively. The rise times are applied to a comparing circuit, which compares a difference therebetween to detect a displacement of a beam of light that is scanning the surface to be scanned from the focus. A control circuit outputs a signal for correcting the displacement from the focus. Simultaneously therewith, a spot judging circuit detects the profile of a spot of the beam of light that is scanning the surface to be scanned from the rise time.

REFERENCES:
patent: 5064284 (1991-11-01), Johnston, Jr. et al.
patent: 5253239 (1993-10-01), Edahiro et al.
patent: 5267012 (1993-11-01), Sasnett et al.

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