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Objective lens driving apparatus using in optical pick device

A technology of driving device and optical pickup, which is applied in the direction of beam guiding device, head configuration/installation, instrument, etc., and can solve the problems of increasing the width and weight of the objective lens driving device, increasing the cost of the objective lens driving device, etc.

Inactive Publication Date: 2002-02-13
TDK CORPARATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] However, in the above-mentioned conventional technology, in order to correct the inclination angles of the objective lens derived from the coils and magnets for tracking servo and focus servo respectively, it is necessary to additionally place a coil 1105 and magnets 1106, 1107 for inclination correction, which increases the drive cost
Simultaneously, in conventional technology, coil 1105 and magnet 1106, 1107 that must be used for inclination correction must be placed on the face of the object lens support 1101 of bearing object lens 1103 in the radial direction one side of optical disk 1100, and this can increase the object lens driving device. width and weight

Method used

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  • Objective lens driving apparatus using in optical pick device
  • Objective lens driving apparatus using in optical pick device
  • Objective lens driving apparatus using in optical pick device

Examples

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no. 1 example

[0049] Now, figure 1 is an exploded perspective view of the first embodiment of the objective lens driving device used in the optical pickup according to the present invention. exist figure 1 , the contents of the reference characters are as follows: reference character 1 represents the lens holder, 2 represents the objective lens, 3 represents the coil unit, 3f represents the focusing coil, 3tr represents the tracking coil, 3ti represents the tilt coil, 5 represents a magnet, 5g represents a magnet Gap.

[0050] The lens holder 1 is made of flexural elastic high modulus light metal such as magnesium alloy, or made of resin mixed with carbon fiber. Using such a material makes the lens holder 1 itself have a higher flexural elastic modulus, so that it has a higher high-order resonance frequency. Because of this, the lens holder 1 can withstand the increase in the speed of the optical disc unit.

[0051] In the lens holder 1, two notch portions 1a are formed, both of which...

Embodiment 2

[0072] Now, Figure 11 is a perspective view showing a second embodiment of the objective lens driving device according to the present invention. exist Figure 11 In , the meanings of the reference characters are respectively expressed as follows: 101 represents a lens holder, 102 represents an objective lens, 103 represents a coil unit, 103f represents a focusing coil, 103tr represents a tracking coil, 103ti represents a tilting coil, 105 represents a magnet, 105 represents a magnetic gap.

[0073] The lens holder 101 is made of flexural elastic high modulus light metal such as magnesium alloy, or made of resin mixed with carbon fiber. Using such a material makes the lens holder 101 itself have a higher flexural elastic modulus, thus having a higher high-order resonance frequency. Because of this, the lens holder 101 can withstand the increase in the speed of the optical disc unit.

[0074] Referring to another structure of the disc holder 101, on its plane, two slits 111...

Embodiment 3

[0097] Now, Figure 18 is a perspective view of a third embodiment of the objective lens driving device according to the present invention. exist Figure 18 In , the meanings of the reference symbols are as follows, 201 represents a lens holder, 202 represents an objective lens, 203 represents a coil unit, and 205 represents a magnet.

[0098] The lens holder 201 is similar in structure to the lens holder 1 employed in the first embodiment described above.

[0099] The coil unit 203 includes a required number of printed circuit boards 203p stacked one on top of the other, and each printed circuit board 203p includes a tracking coil 203t and four focusing coils 203fl and 203fr. The tracking coil 203t is located in the center of the printed circuit board 203p, and the focusing coils 203fl and 203fr are located in the upper and lower sections, and relative to the position of the center of gravity of the objective lens optical axis direction of the moving parts, they are located...

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Abstract

Within the same magnetic gap of a magnetic circuit including at least one magnet magnetized in two polarities, there is disposed a coil unit with a focus coil, a tracking coil and a tilt coil mounted thereon.

Description

technical field [0001] The present invention relates to an objective lens driving device used in an optical pickup constituting an optical disc unit for projecting a light spot onto a recording medium to read information from the optical recording medium. Background technique [0002] The optical pick-up that constitutes an optical disc unit is generally made of objective lens driving device, and this objective lens driving device comprises an objective lens and is used to transmit light on the objective lens and an optical system that receives the light that comes from objective lens, said objective lens driving device Located on the light system mounting table. The objective lens driving device consists of a movable part and a fixed part. The moving parts include an objective lens, focusing coil and tracking coil. The stationary part includes a magnetic circuit. The movable part is supported on the fixed part via four conductors, wherein each of the four conductors is p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/09G11B7/095
CPCG11B7/0935G11B7/0932G11B7/0956G11B7/0933
Inventor 河野纪行
Owner TDK CORPARATION
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