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Object lens for optical pick-up head unit

A technology of optical pickup and objective lens, which is applied in the direction of optical recording head, beam guiding device, optics, etc., and can solve the problems of complicated manufacturing process and difficult mass production of optical pickup heads

Inactive Publication Date: 2002-05-01
TOSHIBA SAMSUNG STORAGE TECH KOREA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, not only does this complicate the manufacturing process, but also the adjustment of the film thickness must be performed precisely in units of "μm"
Thereby it is difficult to mass-produce this optical pick-up head

Method used

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  • Object lens for optical pick-up head unit
  • Object lens for optical pick-up head unit
  • Object lens for optical pick-up head unit

Examples

Experimental program
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Embodiment Construction

[0023] Preferred embodiments of the present invention will be described in more detail below with reference to the accompanying drawings.

[0024] image 3 An optical system of an optical pickup according to a preferred embodiment of the present invention is shown. refer to image 3 , this optical pick-up head device comprises two laser sources 31 and 39, sends out the light beam with different wavelength respectively; Two holographic beam splitters 32 and 40, are used for changing the light path of the light beam reflected by the information recording surface of optical disc; Beam splitting Device 33, according to the wavelength of the light, all transmits or reflects the incident light beam; collimator lens 34, can make the incident light beam become parallel light beam; holographic annular lens 35, is used to diffract the incident light beam according to its wavelength; and objective lens 36, with To focus the light beams on the corresponding information recording surfaces ...

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Abstract

An objective lens using for optical pickup apparatus, focusing the light beams having specifically wavelengths from the light source on the optical recording media recording surface, said objective lens includes an inner region surroundding the optical axis, a holographic region surroundding said inner region which consists of a plurality of ring-shape grooves with stated depth, and an outer region surroundding the holographic region, moreover, the the beam spot focusing on the optical recording media recording surface at least contains the incidencing light beams from said inner region and holographic region of the objective lens. It can be compatible with digital videodiscs (DVD) and recordable compact disc (CD-R), and eliminates the spherical aberration generated when an optical recording medium having a different thickness.

Description

[0001] This application is a divisional application of the invention patent application filed by Samsung Electronics Co., Ltd. on March 28, 1998, entitled "Optical Head Using Holographic Ring Lens Compatible with Multi-purpose Optical Disc and Recordable Mini-Disc", with application number 98108006.5. technical field [0002] The invention relates to an objective lens used in an optical pick-up head device, which can compatibly record information on a digital video disk (DVD) and a recordable optical disk (CD-R) respectively, and read information therefrom. Background technique [0003] The optical pickup device is used to record and read high-density information such as video, audio or data, and its record carrier is a disk, card or cassette. Among them, a disc-type record carrier is mainly used. Recently, in the field of optical disc devices, a laser disc (LD), a compact disc (hereinafter referred to as CD) and a digital vide...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/08G02B5/32G11B7/00G11B7/125G11B7/1275G11B7/135G11B7/1353G11B7/1372G11B7/20
CPCG02B5/32G11B7/1353G11B7/1372G11B2007/0006G11B7/1275G11B7/08
Inventor 刘长勋李哲雨
Owner TOSHIBA SAMSUNG STORAGE TECH KOREA CORP
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