Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1976-05-28
1978-04-18
Konick, Bernard
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
1791003V, 250201, A04N 576
Patent
active
040854230
ABSTRACT:
Information reproducing apparatus for producing information on an optical information recording medium includes a first light source which gives forth a beam of light of a wavelength .lambda..sub.1 and a second light source which gives forth a beam of light of a wavelength .lambda..sub.2 different from the wavelength .lambda..sub.1. An optical element selectively reflects the light of the wavelength .lambda..sub.1 and selectively transmits the light of the wavelength .lambda..sub.2. The first and second light sources, the optical element and the recording medium are positionally arranged so that the light beams from the first and second light sources may be projected on a predetermined position of the recording medium and a substantially identical position to the predetermined position through the optical element, respectively, and the arrangement of these elements is also such that the respective projected light beams may fall on the optical element after being reflected by the recording medium. First and second photodetectors detect light reflected from the optical element and light transmitted light through the same in accordance with the wavelength of the light beams falling on the optical element, respectively, and develop focusing and tracking control signals.
REFERENCES:
patent: 3624278 (1971-11-01), Heckscher
patent: 3627916 (1971-12-01), Bestenreiner
patent: 3876842 (1975-04-01), Bouwhuis
patent: 3932700 (1976-01-01), Snopko
patent: 3969575 (1976-07-01), Gerritsen
"High-Resolution Graphics Using a HeCd Laser to Write on KALVAR film" by A. D. Berg et al; Journal of the SMPTE; July, 1974, vol. 83, p. 596.
"A Review of the MCA Disco-Vision System," Journal of the SMPTE; July, 1974; vol. 83, p. 555; by K. D. Broadbent.
Maeda Takeshi
Oshida Yoshitada
Tsunoda Yoshito
Faber Alan
Hitachi , Ltd.
Konick Bernard
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