Image reading apparatus with a current controller having a bipol

Details Image reading apparatus with a current controller having a bipol Image reading apparatus with a current controller having a bipol

1998-02-24

2000-06-13

Le, Que T.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

358475, G01J 132

Patent

active

060752335

ABSTRACT:
An image reading apparatus includes an LED array which generates light of variable luminance in accordance with a supplied current for irradiating a document paper, an image sensor for receiving the light reflected by the document paper to generate image signals, a current controlling voltage supplier including a digital-to-analog converter for generating a current controlling voltage, and a current controller for controlling current supply to the light irradiator in response to the current controlling voltage from the current controlling voltage supplier. The current controller includes a first bipolar transistor having its base directly connected to the digital-to-analog converter, and a second bipolar transistor having its base connected to to the emitter of the first transistor.

REFERENCES:
patent: 5134273 (1992-07-01), Wani et al.

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