Optical scanning device, mirror objective suitable for use...

Details Optical scanning device, mirror objective suitable for use... Optical scanning device, mirror objective suitable for use...

H - Electricity

04

N

88/96

H04N 1/04 (2006.01) G11B 7/09 (2006.01) G11B 7/125 (2006.01) G11B 7/135 (2006.01)

Patent

CA 2004982

PHN 12.775 09.02.1989 Abstract: "Optical scanning device, mirror objective suitable for use in said device and optical write and/or read apparatus provided with said device." An optical scanning device is described, which comprises a radiation source (9), a mirror objective (10) and a radiation- sensitive detection system (20), which mirror objective comprises a first and a second radiation window (14, 17) and a first and a second reflector (15, 16). A first and a second diffraction element (30, 40) are arranged on the first window (14) and on the second reflector (16), respectively providing the possibility of detecting tracking errors of a scanning spot (V1) in an information plane (3) having tracks, and focusing errors of the scanning beam (b1) relative to the information plane (3). Figure 1.

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