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Optical head apparatus and its producing method

A manufacturing method and technology of an optical head, applied in the direction of optical head manufacturing, light beam guiding device, optical recording head, etc.

Inactive Publication Date: 2004-01-21
SANKYO SEIKI MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, short-wavelength lasers used for high-density recording such as DVDs are more likely to be affected by aberrations, etc.

Method used

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  • Optical head apparatus and its producing method
  • Optical head apparatus and its producing method
  • Optical head apparatus and its producing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] Modification of Embodiment 1

[0061] figure 2 In the example shown, the structure of Embodiment 1 is partially changed, and the prism 7, prism 6, collimator lens 12, and objective lens are arranged from bottom to top in the direction from the first laser light-emitting element 4 to the recording medium, and the prism is omitted. Rising mirror. Other structures such as the design of the second laser light emitting element 5, the grating 11, the light receiving element 2 for signal detection, and the common light receiving element 3 for monitoring are the same as those of the first embodiment, and the description thereof will be omitted.

[0062] In the optical head device thus constituted, among the first laser beam L1 and the second laser beam L2, the first laser beam L1 with a shorter wavelength is guided to the common optical path 10 through the partial reflection surface 60 of the prism 6 for combining optical paths, and the wavelength The long second laser light...

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Abstract

An optical system of the optical head device 1 is provided with a first laser light emitting element 4 for a DVD to emit first laser light L1 and a second laser light emitting element 5 for a CD to emit second laser light L2. The first laser light L1 of a shorter wavelength is transmitted through the partially reflective surface 60 of a prism 6 for optical path synthesis and is guided to a common optical path 10 and the second laser light L2 of a longer wavelength is reflected by the partially reflective surface 60 of the prism 6 and is guided to the common optical path 10.

Description

technical field [0001] The present invention relates to an optical head device in which two types of laser light-emitting elements are mounted on an optical head frame and a manufacturing method thereof. Background technique [0002] As optical recording media, CDs, CD-Rs, and DVDs having different recording forms such as substrate thickness and recording density are known. Among these optical recording media, generally, a pair of high-density recordable DVDs are used for recording and reproduction, and a short-wavelength laser with a wavelength of 650nm or 635nm is used. On the other hand, for recording and reproduction of a CD or CD-R, a 760 -800nm ​​long wavelength laser. Therefore, in order to handle both CD, CD-R and DVD with one optical head device, two kinds of laser light sources must be mounted on the optical head frame, that is, the first laser light-emitting element that can emit the first laser light as short-wavelength laser light and the laser light emitting e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/135G11B7/12G11B7/22
Inventor 酒井博
Owner SANKYO SEIKI MFG CO LTD