Koninklijke Philips Corporation N.v.

Koninklijke Philips Electronics N.v.

Waltherus C J Bierhoff

Szabolcs Deladi

Bernardus H W Hendriks

Nenad Mihajlovic

Cornelius Antonius Hezemans

Adrien Emmanuel Desjardins

Augustinus Laurentius Braun

Cornelius A Hezemans

Franciscus M A M Van Gaal

Adrien E Desjardins

Cornelius A N M Van Der Vleuten

Jan F Suijver

Antonius J J Rademakers

An optical probe and an optical imaging system include an optical guide, and an actuator having driving coils and a magnet. By supplying a driving current through the driving a magnetic flux is generated which causes a displacement of the distal end of the optical guide. A position measuring device includes a position measuring coil used for monitoring the position of the optical guide, where displacement of the guide distal end causes change in the relative positions of the measuring and driving coils. A power supply supplies a high frequency AC current through the driving coils which causes, an induced voltage in the position measuring coil and thus generates a magnetic coupling between the measuring and driving coils. This induced voltage change is indicative for the position of the distal end.

Optical probe having a position measuring system

A clamping device for a disc-shaped information carrier having a central clamping opening, includes a clamping member which is displaceable from a first position, in which the information carrier is clamped by the clamping member, to a second position in which the information carrier is released by the clamping member. The device further includes a lifting member which co-operates with the clamping member and which is displaceable from a first position, in which the lifting member is recessed with respect to a supporting member of the clamping device, to a second position in which the lifting member is raised relative to the supporting member. The device also includes a first locking member, which locks the clamping member in its second position when the lifting member is not substantially situated in its first position, and a second locking member, which locks the lifting member in its first position when the clamping member is not substantially in its second position. The device prevents the clamping member from exerting forces on the inner wall of the clamping opening of the information carrier when the information carrier is placed into or removed from the clamping device. Thus, preventing damage to the inner wall, and when the information carrier is a DVD, it prevents the two disc-shaped substrates of the DVD, which are adhered to each other, from being pressed apart by such forces. The clamping device can be used in a scanning device such as an optical disc player, for clamping an information carrier onto a turntable of the scanning device.

Clamping device for a disc-shaped information carrier

The invention relates to a method of manufacturing a scanning device comprising a support ( ) for an information carrier ( ), a motor ( ) for rotating the support about an axis of rotation ( ), a scanning unit ( ) for scanning the information carrier, and a displacement device ( ) for displacing the scanning unit relatively to the information carrier. According to this method, the motor and the displacement unit are each provided on a separate frame ( ), and the scanning device is provided with a pretensioning means ( ) and an adjusting device ( ). In at least one adjustment position, the frames are held at a mutual distance under the influence of a pretensioning force exerted by said pretensioning means, said distance being adjusted by means of said adjusting device. The adjusting device is used to correct an angular deviation present between a laser beam path ( ) of the scanning unit and a normal to an information surface ( ) of the information carrier as a result of manufacturing tolerances. According to the method in accordance with the invention, an adhesive ( ) is applied between the two frames adjoining the adjusting device, and the distance between the two frames, as adjusted by means of the adjusting device, is secured by curing the adhesive present between the two frames. In this manner, unwanted mutual displacements of the two frames, which could occur as a result of imbalance forces caused by the information carrier rotating at relatively high speeds, are prevented as much as possible.

Method of manufacturing a scanning device with adjustable frames

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Eindhoven, Netherlands

Waltherus C J Bierhoff