Optical scanning device comprising a tiltable lens system
An optical scanning and scanning device technology, which is applied in the configuration/installation of the head, recording/reproducing by optical methods, instruments, etc., and can solve the problems of complex structure of the scanning device and so on.
Inactive Publication Date: 2006-07-19
KONINKLIJKE PHILIPS ELECTRONICS NV
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Problems solved by technology
[0004] The structure of the known scanning device is complicated since it comprises four electric coils that generate a force parallel to the first direction.
Method used
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[0021]figure 1 The optical player shown diagrammatically and according to the invention comprises a platform 1 which can be rotated about a rotation axis 3 and driven by means of an electric motor fixed to a frame 7 . An optically scannable information carrier 9 , such as a CD or DVD, can be placed on the platform 1 , said information carrier 9 having a disc-shaped substrate 11 with an information layer 13 of spiral-shaped information tracks thereon. This information layer 13 is covered by a transparent information protection layer 14 . This optical player also comprises optical scanning means 15 according to the invention to optically scan the information tracks present on the information layer 13 of the information carrier 9 . The scanning means 15 can be displaced with reference to the axis of rotation 3, mainly by means of the displacement means 17 of the optical player, along two opposite radial directions Y and Y'. For this purpose, the scanning device 15 is fixed on th...
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The invention relates to an optical scanning device (15) comprising an objective lens (45) with an optical axis (41). The scanning device comprises an actuator (57) by means of which the objective lens can be displaced in a first direction (X1) parallel to the optical axis, and in a second direction (X2) parallel to a radial direction (Y). The actuator comprises at least two electrical coils (79, 81) having wire portions (87, 89) directed parallel to the first direction for generating Lorentz forces (F2, F3) in the second direction. According to the invention, a point of application of the Lorentz force (F2) on a first one of the coils (79) and a point of application of the Lorentz force (F3) on a second one of the coils (81) are in different positions with respect to each other, viewed in a direction parallel to the first direction. As a result, a mechanical torque (M) is generated by said Lorentz forces about a tilt axis (117) which is directed parallel to a third direction (X3) perpendicular to the first and second directions. As a result, the objective lens is not only displaced in the second direction, but also tilted about said tilt axis. Said tiltability is used to maintain a radiation beam (51) of the scanning device (15) in a position perpendicular to an information surface (13) of an information carrier (9), such as a CD or DVD, to be scanned. In a preferred embodiment, the actuator (57) comprises a first pair of coils (79, 81) near a first side (71) of the objective lens (45), and a second pair of coils (83, 85) near a second side (75) of the objective lens (45) opposite said first side. The centers of the coils of the first pair are positioned on both sides of and at equal distances (a) from the center of gravity (115) of the movable part of the actuator, viewed in a direction parallel to the first direction (X1).
Description
technical field [0001] The invention relates to an optical scanning device for scanning an information layer of an optically scannable information carrier. Provided is an optical lens system of the optical axis on which the radiation beam is focused, and an actuator comprising an electrical coil system and a magnetic system, referenced to a fixed part of the scanning device, whereby the lens system can be moved along a direction parallel to the optical axis a first direction and is displaced along a second direction perpendicular to the first direction, the coil system is provided to generate a force parallel to the second direction, at least one first and one second coil comprises a force towards the first direction Parallel wire sections. [0002] The invention also relates to an optical player comprising an optical scanning device for scanning an information layer of an optically scannable information carrier, said scanning device having a radiation source, an optical lens...
Claims
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IPC IPC(8): G11B7/09G11B7/095
CPCG11B7/0935G11B7/0925G11B7/0956
Inventor P·J·C·H·斯穆尔德斯J·W·阿茨
Owner KONINKLIJKE PHILIPS ELECTRONICS NV