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Method of and apparatus for recording a halftone dot color image on a color photosensitive material
| Details |
Inventors: Inagaki, Yukihiko; Masuda, Yoshikazu; Sasada, Shigeru; Katsuyama, Mikizo; Tanaka, Hirohisa;
Assignee: Dainippon Screen Mfg. Co., Ltd. (JP)
Primary Examiner: Groody; James J.
Assistant Examiner: Grant, II; Jerome
Attorney, Agent or Firm: Ostrolenk, Faber, Gerb & Soffen
Color separation image signals (Y, M, C, K) are converted into halftone dot image signals (Y.sub.d, M.sub.d, C.sub.d, K.sub.d) by a halftone block circuit (29). Red, green, blue and white beams are obtained from red, green and blue light sources (31R, 31G, 31B) or from a single white light source. These beams are modulated by acousto-optical modulators (32R, 32G, 32B, 35) responsive to the halftone dot image signals (Y.sub.d, M.sub.d, C.sub.d, K.sub.d) and thereafter converged onto a color photosensitive material (23), to produce a halftone dot color image on the color photosensitive material (23). |
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DETAILED DESCRIPTION According to a first aspect of the present invention, a method of recording a halftone dot color image on a color photosensitive material comprises the steps of preparing a color photosensitive material, providing red, green and blue beams, forming a white beam by compounding the red, green and blue beams, providing color separation image signals of yellow, magenta, cyan and black of a desired color image, converting the color separation image signals into halftone dot image signals of yellow, magenta, cyan and black having particular screen angles, modulating the red, green, blue and white beams in response to the halftone dot image signals of cyan, magenta, yellow and black, respectively, to generate modulated red, green, blue and white beams, converging the modulated red, green, blue and white beams onto the color photosensitive material to form an exposure beam spot, and scanning the color photosensitive material with the exposure beam spot by relatively moving the color photosensitive material and the exposure beam spot to record the desired color image in a halftone dot manner on the color photosensitive material.
According to a second aspect of the present invention, a method of recording a halftone dot color image on a color photosensitive material comprises the steps of, preparing a color photosensitive material, providing a white beam, separating red, green and blue beams from the white beam, providing color separation image signals of yellow, magenta cyan and black of a desired color image, converting the color separation image signals into halftone dot image signals of yellow, magenta, cyan and black having particular screen angles, modulating the red, green, blue and white beams in response to the halftone dot image signals of cyan, magenta, yellow and black, respectively, to form modulated red, green, blue and white beams, converging the modulated red, green, blue and white beams onto the color photosensitive material to form an exposure beam spot, and scanning the color photosensitive material with the exposure beam spot by relatively moving the color photosensitive material and the exposure beam spot to record the desired color image in a halftone dot manner on the color photosensitive material
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Optical Systems 
