image input device

Abstract

Abstract PURPOSE:To impove the operability of a picture input device by reading the pictures exposed by a light source, detecting the read position and controllig the lighting of the light source with the detected output. CONSTITUTION:The light given from LED23 arrayed in the lengthwise direction of a picture reading head 1 is exposed to an original 20 via a supporter 2 of a light transmitting material. The reflected light sent from the original 20 is formed into images on the photodetecting surface of a sensor 21. The picture analog signal given from a sensor part 40 is converted into the digital signal by an A/D converter 45 and then binary coded to be supplied to a picture memory 52. While a memory driving circuit 51 supplies the pulse output given from a reference oscillator 49 in the form of a main and secondary scan clocks, and at the same time a slit end detection signal A. The addresses of the memory 52 are successivly decided with each output of the signal A, and the start of scan is decided by a scan position detecting circuit 53. The lighting of the LED23 is controlled with the detected output of the circuit 53. Thus the operability is improved for a picture input device.

Inventors

• 👤 Hiroshi Tanioka
• 👤 宏 谷岡
• 👤 Noriyoshi Ueda
• 👤 上田　典由

Bibliographic Details