Title:
【発明の名称】イメージセンサ
Document Type and Number:
Japanese Patent JP2704187
Kind Code:
B2
Abstract:
PURPOSE:To enable color reading with simple configuration by irradiating an original with the plural light source of various light emitting wavelengths and synchronizing the light emission of the light source with the switch of a sensor read circuit when reflected light is read by the image sensor of a direct read system. CONSTITUTION:LED 6-1-6-n to emit the light of the various wave-length are driven by a pulse voltage from an exclusive LED driving circuit 5 and the reflected light from the original is read by a sensor array 1 of the direct read system. An output current is converted to a voltage through an I/V converter 2 and a signal, which is amplified by an amplifier 3, is corrected in a bit correcting circuit 4 in correspondence to the light splitting sensitivity of the sensor and the light emitting intensity of the LED and goes to be output through sample-hold circuits 7-1-7-n. This sample-hold and LED are synchronized by the same timing generator 8. Thus, without requiring a complicated process and high-grade technique, a color sensor can be obtained at low cost.
Inventors:
Takeshi Fukada
Hiroaki Masaaki
Sanpei Yamazaki
Hiroaki Masaaki
Sanpei Yamazaki
Application Number:
JP14917889A
Publication Date:
January 26, 1998
Filing Date:
June 12, 1989
Export Citation:
Assignee:
Semiconductor Energy Laboratory Co., Ltd.
International Classes:
H04N1/028; H04N1/04; H04N9/04; (IPC1-7): H04N1/028; H04N1/04; H04N9/04
Domestic Patent References:
| JP63227055A | ||||
| JP62149251A |