Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1989-03-14
1990-03-13
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
369 46, G01J 120
Patent
active
049085069
ABSTRACT:
Optical scanning apparatus which includes a diode laser producing a radiation beam which is focussed by a lens system on a reflecting information plane to be scanned thereby. The reflected radiation is diffracted by a composite diffraction grating which includes a pair of sub-gratings, forming respective radiation spots on respective pairs of radiation detectors. The detectors in each pair are separated by a separating strip, the separating strips being substantially parallel to or co-linear with the bonding line between the sub-gratings. Such arrangement achieves correction for wavelength variations of the radiation beam, as well as fairly wide tolerances in the relative positioning of the various optical elements of the apparatus.
REFERENCES:
patent: 4363962 (1982-12-01), Shida
patent: 4725725 (1988-02-01), Ando 250216
Coops Peter
Duijvestijn Adrianus J.
Eason Leroy
Nelms David C.
Oen William
Tamoshunas A.
U.S. Philips Corporation
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