Apparatus for optically scanning an information plane

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

G - Physics

11

B

88/96, 352/32.4

G11B 7/09 (2006.01) G02B 27/16 (2006.01) G02B 27/44 (2006.01) G11B 7/08 (2006.01) G11B 7/135 (2006.01)

Patent

CA 1263183

ABSTRACT: Apparatus for optically scanning an information surface, 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. Figure 1.

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