Tête optique et détecteur optique à cet usage

Optical head and optical detector used in the same

Optischer Abtastkopf und optischer Detektor dafür

Abstract

An optical head includes: a light source for emitting light; first optical element for forming at least three light beams from the light emitted from the light source; second optical element for converging said at least three beams on a storage medium; and a photodetector for receiving said at least three beams reflected by the storage medium to generate electrical outputs in accordance with an intensity of the light beams, the photodetector including; a semiconductor substrate (110); a light receiving section formed on a surface of the semiconductor substrate for receiving the light beams reflected by the storage medium; a plurality of input terminals (7P1,P2) for receiving a supply of a predetermined potential; and a plurality of output terminals 6 (A-F) for outputting electric signals, wherein the light receiving section includes a plurality of light receiving elements 6 (A,B,C,D) for signal detection provided apart from each other on the surface of the semiconductor substrate and a plurality of stray light carrier absorption regions 6 (G-H) provided so as to substantially fill regions between the plurality of light receiving elements for signal detection, and wherein the plurality of stray light carrier absorption regions are made of first impurity diffusion regions of a first-conductivity type formed in the semiconductor substrate, the first impurity diffusion regions forming PN junctions and depletion layers in the semiconductor substrate so as to absorb stray light carriers generated in the semiconductor substrate by stray light.

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Patent Citations (4)

    Publication numberPublication dateAssigneeTitle
    EP-0167357-A2January 08, 1986Sony CorporationDispositifs photosensibles et têtes optiques
    JP-H04205727-AJuly 27, 1992Matsushita Electric Ind Co LtdOptical head
    JP-S5623788-AMarch 06, 1981Fujitsu LtdSemiconductor light receiving element
    JP-S61214143-ASeptember 24, 1986Matsushita Electric Ind Co LtdPhotodetector element

NO-Patent Citations (3)

    Title
    PATENT ABSTRACTS OF JAPAN vol. 11, no. 45 (P - 546)<2492> 10 February 1987 (1987-02-10)
    PATENT ABSTRACTS OF JAPAN vol. 16, no. 547 (P - 1452) 17 November 1992 (1992-11-17)
    PATENT ABSTRACTS OF JAPAN vol. 5, no. 74 (E - 57)<746> 16 May 1981 (1981-05-16)

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    EP-0978828-A3December 20, 2000Sharp Kabushiki KaishaOptische Abtastvorrichtung
    EP-1605448-A3November 15, 2006Sony CorporationOptical head, optical drive apparatus, and method for generating tracking error signal
    GB-2306070-BFebruary 02, 2000Samsung Electronics Co LtdOptical pickup device
    GB-2312346-AOctober 22, 1997Northern Telecom LtdTDMA timing control
    GB-2312346-BJuly 12, 2000Northern Telecom Ltd, Nortel Networks CorpMarshalling in optical tdma systems
    US-5991059-ANovember 23, 1999Northern Telecom LimitedMarshalling in optical TDMA systems
    US-6208610-B1March 27, 2001Sony CorporationAdjustable optical pickup device with means for removing stray light
    US-6392965-B1May 21, 2002Sharp Kabushiki KaishaOptical pickup device
    US-8159909-B2April 17, 2012Sony CorporationOptical head, optical drive apparatus, and method for generating tracking error signal