1 August 1990 Development of a multibeam recording head with laser diodes for color scanners
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Abstract
Except some special cases the color printing is usually performed by overprinting a series of four plates in yellow (Y) magenta (M) cyan (C) and black (BK) ink. Process Color Scanner is the device that reads the fullcolor on ginal to be reproduced it into four color components (Y and BK) converts the totalvalue into the dot sizes provides the output on the photosensitive materials such as monochrome film on monochrome paper. The optical dot formation of our Process Colon Scanner SG series is performed as follows: 1. Ten light spots that may be independently switched (ON and OFF) at high speed are formed in line on a photosensitive material. 2. Such photosensitive material wrapped around the surface of a notating drum forms the dots on its surface according to the light spots switched by the signals from the dot generator as the drum notates. (See Fig. 1) Conventionally the gas laser (HeNe on Ar) has been used as the light source where a beam from a single laser tube is splitted into ten beams by the use of a beam splitter and an external modulator is provided to each laser beam to control its switching. As the semiconductor laser has the features such as high speed self-modulability and compact size we have developed new exposure system with ten semi conductor laser elements to replace conventional system consisting of a gas a beam splitter and ten external modulators. (See Fig. 2) 1. CONSTRUCTION OF THE SYSTEM 1. 1. Light emitting section The semiconductor laser emitting the light of 780 nm wave length is employed for the matching with photosensitive materials currently available. And as this type of semiconductor laser is also used in compact disc system etc. it offers stable performance and good availability. 1. 2. Method to control the beam Unlike the gas laser beam with an excellent directivity the semi- 68 / SPIE Vol. 1254 Optical Hard Copy and Printing Systems (1990)
© (1990) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Yutaka Tamura, Yutaka Tamura, } "Development of a multibeam recording head with laser diodes for color scanners", Proc. SPIE 1254, Optical Hard Copy and Printing Systems, (1 August 1990); doi: 10.1117/12.19847; https://doi.org/10.1117/12.19847
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