Light leakage detecting device of an optical transmission...

Details Light leakage detecting device of an optical transmission... Light leakage detecting device of an optical transmission...

2005-08-02

2005-08-02

Le, Que T. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C250S227150

Reexamination Certificate

active

06924474

ABSTRACT:
A technique is provided in which the inside and outside of an exposure device is prevented from being adversely affected by leakage of light by setting an inspection output most suitable for high-power LD. A light-leakage detection level is set correspondingly to output characteristics of each high-power LD, and respective thresholds thereof are previously stored. As a result, leakage of light can be determined in a lower-power state of 100 mW or less. Accordingly, even if leakage of light may occur, leakage of light can be determined before high-power light leaks, and the inside and outside of the device can be prevented from being adversely affected by light leakage.

REFERENCES:
patent: 4812641 (1989-03-01), Ortiz Jr.
patent: 5104391 (1992-04-01), Ingle et al.

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