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公开(公告)号：CA1187606A
公开(公告)日：1985-05-21
申请号：CA414873
申请日：1982-11-04
Applicant: PHILIPS NV
Inventor： GIJZEN WILHELMUS A H , KLEUTERS WILHELM J , HOEKSTRA BOB , VAN ROSMALEN GERARD E
Abstract: 18 An electro-optical apparatus comprises an objective which scans an optical disc having a transparent protective layer by means of a radiation beam which, through the transparent layer, is focussed on a reflecting recording surface, the objective moving along the optical axis for focussing the radiation beam on the recording layer and moreover performing limited pivotal movement. The angular position of the optical axis of the objective is corrected for obliquity of the surface of the optical disc, correction means being provided to tilt the objective through a correction angle, so that the angle between the optical axis and the normal to the disc surface is reduced.
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公开(公告)号：DD158969A5
公开(公告)日：1983-02-09
申请号：DD23003781
申请日：1981-05-18
Applicant: PHILIPS NV
Inventor： GIJZEN WILHELMUS A H , VAN ROSMALEN GERARD E
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公开(公告)号：CA1124392A
公开(公告)日：1982-05-25
申请号：CA299406
申请日：1978-03-21
Applicant: PHILIPS NV
Abstract: PHN.8739 08-07-77 An optical scanning device which scans a rotary video disc with the aid of a light beam comrises an objective which performs focussing movements, for focussing a light spot on a recording surface of the video disc, as well as tilting tracking movements and time-error correction movements. Near its lower end the objective is suspended in an impregnated corrugated loudspeaker diaphragm of fabric fibre which enables the various movements of the objective to be made without giving rise to annoying resonant effects. The tracking movements and the time-error correction movements are obtained with the aid of coils which are connected to the objective near the upper end and which are disposed in air gaps of associated permanent magnetic stators.
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公开(公告)号：CA1272803A
公开(公告)日：1990-08-14
申请号：CA519090
申请日：1986-09-25
Applicant: PHILIPS NV
Abstract: Apparatus for reading information from a record carrier. In addition to the customary servo control devices (15, 18 and 21) for radial tracking, focussing and speed control respectively an apparatus for reading, for example, a Compact Disc (3) comprises three feed-forward control loops (30, 40 and 50) which each comprise an acceleration transducer (31, 41 and 51) which in the case of shocks and vibrations give the optical read unit (5) the same angular acceleration, the optical read unit (5) the same linear acceleration and the motor (2) the same angular acceleration as the apparatus (1) itself, so that the apparatus is less sensitive to shocks and vibrations. Fig. 1.
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公开(公告)号：CS266336B2
公开(公告)日：1989-12-13
申请号：CS591586
申请日：1986-08-07
Applicant: PHILIPS NV
Inventor： GIJZEN WILHELMUS A H , HONDS LEONARD , MEYER KARL-HANS , VAN SLUYS ROBERT N J , VAN ROSMALEN GERARD E
Abstract: An optical scanning unit with an objective for the focussing a beam of radiation along an optical axis into a scanning spot on the surface of an information carrier. The scanning unit also has an electromagnetic drive for correcting the position of the objective with respect to the information carrier. The drive has an objective mount supported in an annular, moving magnetic member which is axially magnetized and is arranged coaxially about the optical axis. The drive is further provided with fixed coils which interact with the magnetic member via an air gap. The fixed coils are arranged along at least three radial planes which are normal to the optical axis. Two planes lie in the area of the axial ends of the centrally positioned magnetic member and the third central plane which extends between the two outer radial planes.
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Patent Agency Ranking
公开(公告)号：CS8604233A2
公开(公告)日：1989-07-12
申请号：CS423386
申请日：1986-06-09
Applicant: PHILIPS NV
Inventor： VAN ROSMALEN GERARD E
CPC classification number: G11B7/0935 , G01B11/26 , G11B7/09
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公开(公告)号：CS591586A2
公开(公告)日：1989-03-14
申请号：CS591586
申请日：1986-08-07
Applicant: PHILIPS NV
Inventor： GIJZEN WILHELMUS A H , HONDS LEONARD , MEYER KARL-HANS , VAN SLUYS ROBERT N J , VAN ROSMALEN GERARD E
Abstract: An optical scanning unit with an objective for the focussing a beam of radiation along an optical axis into a scanning spot on the surface of an information carrier. The scanning unit also has an electromagnetic drive for correcting the position of the objective with respect to the information carrier. The drive has an objective mount supported in an annular, moving magnetic member which is axially magnetized and is arranged coaxially about the optical axis. The drive is further provided with fixed coils which interact with the magnetic member via an air gap. The fixed coils are arranged along at least three radial planes which are normal to the optical axis. Two planes lie in the area of the axial ends of the centrally positioned magnetic member and the third central plane which extends between the two outer radial planes.
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公开(公告)号：CA1194195A
公开(公告)日：1985-09-24
申请号：CA406926
申请日：1982-07-08
Applicant: PHILIPS NV
Inventor： HOEBERECHTS ARTHUR M E , VAN ROSMALEN GERARD E
IPC: H01L27/14 , G02B7/28 , G03B3/00 , H01L27/146 , H01L31/02 , H01L31/0352 , H01L31/10
Abstract: Device for detecting radiation and semiconductor device for use in such a device. In a radiation-sensitive semiconductor element which is divided into a number of sub-elements, the surface potential in the sub-elements varies in the case of incident radiation as a result of charge carriers generated by the radiation. As soon as an adjustable threshold value of this potential is reached in one or more of the subelements, a current starts to flow which is signalled by means of a detector and a detection unit. Because the speed of reaching the threshold value depends on the intensity of the radiation, the time measured between the adjustment of the threshold value and the signalling of the current is a measure of the radiation intensity. By means of such a semiconductor element, the associated detection unit and extra electronics, if any, the energy or the cross-section of a beam can be determined and be readjusted; if necessary. Such a semiconductor device can also be used very readily for focusing, for example in VLP apparatus.
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公开(公告)号：CA1194178A
公开(公告)日：1985-09-24
申请号：CA400099
申请日：1982-03-31
Applicant: PHILIPS NV
Inventor： VAN ROSMALEN GERARD E
Abstract: 18 In an object position detector using a radiation sources, a beam-splitting prism and a radiation sensitive detection system to detect the position of an object relative to a base, only a small and light prism is mounted on the object and each detector of the detection system is divided into two ways to provide two outputs Sy and Sxr giving translation and angular position error signals which can be fed to electromagnetic actuators to correct the object position.
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公开(公告)号：CA1081511A
公开(公告)日：1980-07-15
申请号：CA269546
申请日：1977-01-12
Applicant: PHILIPS NV
Inventor： VAN ROSMALEN GERARD E
Abstract: An automatic optical focussing system suitable for a video disc player comprises an optical focussing device with an objective which is moved to and fro at high frequency in the direction of its optical axis by electrodynamic drive means. The resultant high frequency component thus superimposed on the signal which has been modulated by the information track of the video disc is employed for automatic control of the position of the objective. For the sake of low power consumption the objective is connected to an oscillation compensation element by means of at least one resilient element, for example a circular plate which compensation element is axially movable relative thereto and, together with the objective and the resilient element, constitutes a mechanical resonant system. On the resonant system a piezo-electric acceleration transducer may be mounted with the aid of which the mechanical resonant system can be included in a selfoscillating loop.
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