Apparatus for optically scanning an information plane wherein a

Details Apparatus for optically scanning an information plane wherein a Apparatus for optically scanning an information plane wherein a

1985-12-26

1987-05-12

Willis, Davis L.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

369 45, G01J 120

Patent

active

046653104

ABSTRACT:
An apparatus is described for optically scanning an information surface (2). The apparatus comprises a radiation source (4), an objective system (6) and, arranged between them, a diffraction grating (9) for separating the beam reflected by the information surface from the beam (5) emitted by the source and for splitting the reflected beam into two sub-beams (5a, 5b). For each sub-beam there is provided an associated detector pair (16, 17; 18, 19). The grating (9) comprises two sub-gratings (11 and 12) whose grating lines (13, 14) are disposed at opposite angles to the bounding line (26) of the sub-gratings.

REFERENCES:
patent: 4034403 (1977-07-01), Compaan et al.
patent: 4374323 (1983-02-01), Winslow et al.
patent: 4462095 (1984-07-01), Chen

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