G - Physics – 11 – B
Patent
G - Physics
11
B
88/96
G11B 7/135 (2006.01) G11B 7/09 (2006.01)
Patent
CA 2004994
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 with a mirror- objective (30) arranged between a radiation source (40) and an object (10) to be scanned, which mirror objective comprises two radiation windows (31, 34) and two reflectors (32, 33). By giving one of the windows (31, 34) an aspherical shape, the mirror objective is well corrected for spherical aberrations, while no stringent requirements need to be imposed on the accuracy of the shape of the aspherical surface (35). Fig. 3.
Baalbergen Johannes Jacobus
Braat Josephus Johannes Maria
Opheij Willem Gerard
Van Sambeeck Alexius Josephus Theodorus
Fetherstonhaugh & Co.
Koninklijke Philips Electronics N.v.
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