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Optical head and optical pickup device

A technology of optical pickup and optical head, applied in the direction of optical recording head, beam source, etc., can solve the problems of changing the position of the light-emitting point of the laser diode 211, time-consuming and so on

Inactive Publication Date: 2008-11-26
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] In the prior art example 2, when adjusting the inclination of the laser diode 211, there is an advantage that one adjustment screw 271 can be used for adjustment, but since the end of the adjustment plate 221 on the side opposite to the position of the adjustment screw 272 is The fulcrum is inclined, so there is a problem that the position of the light-emitting point of the laser diode 211 fixed on the adjustment plate 221 changes
In addition, when adjusting the position, it is still necessary to unscrew or screw in the screws of the fixing plate 291, so it will take time.
[0014] In the prior art example 3, although the position of the light-emitting point of the laser diode 311 does not change, when the position of the laser diode 311 is adjusted, it is necessary to release the connection with the housing that is fixed with the holder 321 before the position adjustment can be performed. will take time

Method used

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  • Optical head and optical pickup device
  • Optical head and optical pickup device
  • Optical head and optical pickup device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] Refer below Figure 1 to Figure 5 The optical head in Embodiment 1 of the present invention will be described.

[0066] figure 1 is a perspective view of the optical head in Embodiment 1 of the present invention. figure 2 It is an exploded perspective view showing separately the laser holder and the holder support base of the optical head in Example 1 of the present description. image 3 It is along the state that the central axis of the laser bracket is consistent with the central axis of the optical head figure 1 A schematic cross-sectional view of the optical head observed by the arrow A-A. Figure 4 It is along the state that the central axis of the laser bracket is inclined relative to the central axis of the optical head figure 1 A schematic cross-sectional view of the optical head observed by the arrow A-A. Figure 5 It is in the state that the central axis of the laser bracket is tilted relative to the central axis of the optical head and moved along th...

Embodiment 2

[0100] Refer below Figure 6 The optical head in Embodiment 2 of the present invention will be described.

[0101] Figure 6 It is for the optical head in embodiment 2 of the present invention and figure 1 The schematic cross-sectional view obtained by cutting the same part as the arrow A-A is a schematic cross-sectional view showing a state where the central axis of the laser holder coincides with the optical axis of the optical head.

[0102] The structure of this embodiment is basically the same as that of Embodiment 1. That is, the optical head 1 includes: a laser diode 11, a laser bracket 21 holding the laser diode 11, and a bracket supporting platform 31 abutting against and supporting the laser bracket 21. The only difference from Embodiment 1 is the structure of the abutting portion 23. Let's explain this point.

[0103] The abutting portion 23 provided on the laser holder 21 is the same as in the first embodiment. A pair of abutting portions 23 are protrudingly p...

Embodiment 3

[0109] Refer below Figure 7 The optical head in Embodiment 3 of the present invention will be described.

[0110] Figure 7 It is for the optical head in the embodiment 3 of the present invention in conjunction with figure 1 The schematic cross-sectional view obtained by cutting the same part as the arrow A-A is a schematic cross-sectional view showing a state where the central axis of the laser holder coincides with the optical axis of the optical head.

[0111] The optical head 1 of the present embodiment includes: a laser diode 11 , a laser bracket 21 holding the laser diode 11 , and a bracket supporting table 31 abutting against and supporting the laser bracket 21 . Each component is arranged based on the optical axis P of the optical head 1 .

[0112] The laser holder 21 is a cylindrical frame composed of four side walls, and the laser holder central axis CH passing through the center of the frame is arranged so as to coincide with the optical axis P of the optical h...

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PUM

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Abstract

An optical head comprises a laser holder retaining a laser diode, and a holder support retaining the laser holder, and irradiates an information storage medium with laser light from the laser diode to perform recording / reproduction of information. In this optical head, the laser holder is a frame structure that fixes the laser diode, having an abutment portion protruding from a base side of the frame structure. Also, the holder support has a receiving surface that supports by abutment the abutment portion, and a through-hole that lets pass the laser light. The receiving surface is a plane approximately perpendicular to an optical axis of the optical head, the abutment portion being made as an arc surface having a central axis that passes through an emission point of the laser diode and is perpendicular to the optical axis.

Description

[0001] This application claims the priority of Japanese Patent Application No. 2005-192412 filed in Japan on June 30, 2005. By making this description, the entire content is referred in this application. technical field [0002] The present invention relates to an optical head having a structure for adjusting the optical axis of laser light and an optical pickup device using the optical head. Background technique [0003] The optical pickup device is configured such that the laser light emitted from the laser diode passes through a collimating mirror, a beam shaping prism, an objective lens, etc., and then is irradiated onto an information recording medium, and the reflected light reflected from the surface of the information recording medium is read as an optical signal by a photodetector. . [0004] The laser beam is formed into parallel light by a collimator, shaped into a circular beam by a beam shaping prism, focused by an objective lens after passing through a beam sp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B7/12G11B7/125
Inventor 春日恭二吉泽明穗
Owner SHARP KK