Image reader

Abstract

Abstract PURPOSE: To achieve a reduction in the capacity of memory means and the number of parts by detecting the start mark and end mark of a read image with an image sensor and controlling the quantity of light emission of a light emiting means from the detecting density of the start mark. CONSTITUTION: Slide members 21, 22, hence start mark 31 and end mark 32 are set according to the boundary lines l 1 , l 2 of the required read region S 1 of an original 3 to the original 3 having been set to the image read plane S 0 set on the surface of the glass plate 20 of an original platen 2. These marks 31, 32 are detected with an image sensor and only the image signal of the read region S 1 is transferred by the detection signals thereof to an image data memory device. Hence, the memory regions of the memory device and memory capacity of RAM may be decreased. In addition, the image sensor is commonly used in such a manner that the quantity of light emission of a lighting means is controlled from the density of the image of the start mark 31 having been read with the image sensor, whereby the number of constituting parts may be decreased. COPYRIGHT: (C)1981,JPO&Japio

Inventors

• 👤 Yoshiyuki Tanaka
• 👤 Hiroaki Kojima
• 👤 Shozo Kaieda
• 👤 Tokuji Kakiuchi
• 👤 Nobuaki Nishioka
• 👤 Yukio Tadauchi
• 👤 Hidekazu Nakagami

Bibliographic Details