Intensity controlling circuit having fuses and EPROMs for LED-ar

Details Intensity controlling circuit having fuses and EPROMs for LED-ar Intensity controlling circuit having fuses and EPROMs for LED-ar

1994-05-25

1996-05-14

Nelms, David C.

Miscellaneous active electrical nonlinear devices, circuits, and

External effect

Light

327515, 327525, 327566, 327108, 250206, 250553, 347238, 347253, 365112, 365114, 365244, H01L 3100, H01H 3776, H01J 4014, G01D 942

Patent

active

055171516

ABSTRACT:
An intensity controlling circuit device can correct variation in intensity of light beams, due to tolerance occurred in each of a plurality of LED-array chips, emitted by LEDs provided in each of the LED-array chips. The intensity controlling circuit device is connected to at least one LED-array chip comprising a plurality of LEDs and slave transistors corresponding to each of the LEDs. The intensity controlling circuit device comprises an intensity controlling circuit connected to the respective LED-array chip. The intensity controlling circuit comprises a first transistor provided between a power source and a constant current generating unit so as to supply a current to the LED-array chip, and an intensity adjusting unit having a second transistor connected to the first transistor in parallel and a controlling unit for controlling the on/off state of the second transistor. An output of the intensity controlling circuit is connected to each of the slave transistors provided in the LED-array chip, and the second transistor is turned on/off by the controlling unit so that a current flowing in each of the LEDs is adjusted to a predetermined value.

REFERENCES:
patent: 4706130 (1987-11-01), Yamakawa
patent: 4746941 (1988-05-01), Pham et al.
patent: 5166702 (1992-11-01), Mattern et al.
patent: 5253934 (1993-10-01), Potucek et al.
patent: 5264868 (1993-11-01), Hadley et al.
patent: 5309151 (1994-05-01), Aoki

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