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Jeroen Wals, Joris Jan Vrehen, Sjoerd Stallinga: Optical wavefront modifier. Koninklijke Philips Electronics, Michael E Belk, September 10, 2002: US06449236 (11 worldwide citation)

An optical wavefront modifier modifies a wavefront of an optical beam passing through the modifier. The modifier comprises a first and a second transparent electrode layer and a flat medium for modifying the wavefront depending on electrical excitation of the medium and arranged between the electrod ...


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Bernardus Hendrikus Wilhelmus Hendriks, Jeroen Wals: Optical scanning device. Koninklijke Philips Electronics, Michael E Belk, February 3, 2004: US06687037 (10 worldwide citation)

An optical device scans record carriers with radiation of two wavelengths. The device has an objective lens with a diffractive part with a pattern of elements of stepped profile. The total of the step heights are substantially equal to multiples of height h


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Jeroen Wals: Optical record carrier scanning device. Koninklijke Philips Electronics, June 4, 2002: US06399932 (6 worldwide citation)

An optical scanning device for scanning a record carrier directs a radiation beam towards the record carrier. Two detection systems are arranged in the path of the beam reflected by the record carrier, one before and one after the focus of the beam. Output signals of the detection systems represent ...


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Bernardus Hendrikus Wilhelmus Hendriks, Jeroen Wals: Optical scanning device. Koninklijke Philips Electronics, Michael E Belk, June 15, 2004: US06751021 (4 worldwide citation)

The present invention provides a scanning device with the following features: the system is capable of writing data to record carriers of a first format because it is corrected for chromatic aberration resulting from fast wavelength variations during write operation; it has a diffractive element wit ...


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Sjoerd Stallinga, Jeroen Wals, Joris Jan Vrehen: Optical wavefront modifier including a series arrangement of transparent resistors between electrodes and scanning devices including such a modifier. Koninklijke Philips Electronics, Michael E Belk, May 17, 2005: US06894968

An optical wavefront modifier (27) is adapted for modifying a wavefront of an optical beam passing through the modifier. The modifier comprises a first and a second transparent electrode layer (42′, 43′) and a flat medium (46) for modifying the wavefront in dependence on electrical excitation and ar ...


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Arnoldus Jeroen Niessen, Marcel Rieck, Jeroen Wals: Device for scanning an information carrier and method of operating such a device. Koninklijke Philips Electronics, Michael E Belk, December 10, 2002: US06493292

A device according to the invention is suitable for scanning an information carrier with tracks around an axis. The device has means for transferring information to/from a scanning spot on the information carrier. The device has tangential displacement means for moving the scanning spot in a tangent ...


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Jeroen Wals, Joris Jan Vrehen, Sjoerd Stallinga: Optical wavefront modifier. Philips Corporation, Jack E Haken, c o US PHILIPS CORPORATION, July 5, 2001: US20010006429-A1

An optical wavefront modifier (27) is adapted for modifying a wavefront of an optical beam passing through the modifier. The modifier comprises a first and a second transparent electrode layer (42, 43) and a flat medium (46) for modifying the wavefront in dependence on electrical excitation of the m ...


10
Sjoerd Stallings, Joris Jan Vrehen, Jeroen Wals: Optical scanning head. US Philips Corporation, Jack E Haken, c o US PHILIPS CORPORATION, July 26, 2001: US20010009538-A1

An optical head scans the information layer (3) of an optical record carrier (1) by means of a radiation beam (13). Optical aberrations in the beam such as coma and spherical aberration, caused by tilt and thickness variations in the optical disc respectively, are compensated by an aberration compen ...