LED stabilizing light source device

Details LED stabilizing light source device LED stabilizing light source device

1989-05-01

1991-03-05

Pascal, Robert J.

Electric lamp and discharge devices: systems

With radiant energy sensitive control means

Load device irradiating the radiant energy responsive device

250205, G01J 132

Patent

active

049980432

ABSTRACT:
An LED stabilizing light source device comprises an LED, a drive circuit for driving the LED, a wavelength filter for filtering the light emitted from the LED, a light splitter for splitting the light passing through the filter, a photodiode for receiving the split light. The device further comprises a feedback loop for feeding an output of the photodiode to the drive circuit.

REFERENCES:
patent: 3770966 (1973-11-01), Sagawa et al.
patent: 3996494 (1976-12-01), Suga
patent: 4182977 (1980-01-01), Stricklin, Jr.
patent: 4281245 (1981-07-01), Brogardh et al.
patent: 4687919 (1987-08-01), Nagano
Thomas et al., Digital Feedback Light-Emitting Diode Control, IBM Technical Disclosure Bulletin, vol. 16, No. 8, Jan. 1974, pp. 2598-2600.
National Conference Record, 1986, The Institute of Electronics and Communication Engineers of Japan, (part 2).

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