KR930008454B1 - Optical pick-up device - Google Patents

Optical pick-up device Download PDF

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Publication number
KR930008454B1
KR930008454B1 KR1019900008207A KR900008207A KR930008454B1 KR 930008454 B1 KR930008454 B1 KR 930008454B1 KR 1019900008207 A KR1019900008207 A KR 1019900008207A KR 900008207 A KR900008207 A KR 900008207A KR 930008454 B1 KR930008454 B1 KR 930008454B1
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KR
South Korea
Prior art keywords
objective lens
light receiving
light
receiving elements
disk
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KR1019900008207A
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Korean (ko)
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KR920001452A (en
Inventor
우정근
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삼성전자 주식회사
강진구
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Priority to KR1019900008207A priority Critical patent/KR930008454B1/en
Publication of KR920001452A publication Critical patent/KR920001452A/en
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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers

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  • Optical Recording Or Reproduction (AREA)

Abstract

The device includes four photo recepters and an objective lens for focusing and reading a record information, and another two photo recepters placed on the side of the objective lens to compensate the slope of disks and tracking errors to receive the light reflected by the disk, thereby compensating the slope sensatively by a moving photo recepter without additional radiator.

Description

기울기 보정형 픽업장치Tilt Correction Pickup

제 1 도는 종래의 광픽업 개략도.1 is a schematic diagram of a conventional optical pickup.

제 2 도는 제 1 도의 픽업을 이용한 포커스, 트랙킹 및 기울기 보정신호 발생회로도.2 is a circuit diagram of a focus, tracking and tilt correction signal using the pickup of FIG.

제 3 도는 본 발명에 다른 광픽업의 개략도.3 is a schematic diagram of an optical pickup according to the present invention.

제 4 도는 본 발명의 기울기 보정신호 발생회로도.4 is a tilt correction signal generation circuit diagram of the present invention.

* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings

1 : 광디스크 2 : 발광부1 optical disc 2 light emitting unit

10 : 픽업본체 11 : 대물렌즈 발광부10: pickup body 11: the objective lens light emitting unit

12 : 대물렌즈 보호필터 13A,13B : 기울기보정용수광소자12: objective lens protection filter 13A, 13B: tilt correction light receiving element

본 발명은 광디스크 재생에 필요한 광픽업장치에 관한 것으로서 특히 대물렌즈에 발사되어 디스크로부터 반사된 빛을 수광하여 디스크의 기울기를 보정하기 위한 기울기 보정형 픽업장치에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical pickup apparatus required for optical disc reproduction, and more particularly, to a tilt correction type pickup apparatus for receiving a light emitted from an objective lens and reflecting light from the disc to correct the tilt of the disc.

종래의 광픽업장치에 있어서 디스크(1)의 기울기를 보정하여 정확한 신호를 출력하기 위해서는 제 1 도에 도시한 바와같이 발광소자(2)와 수광소자(3)를 픽업외부에 따로 설치하여 디스크(1)의 기울기를 보정하였다. 다시 말하면 종래의 픽업에 있어서 포커스(FOCUS)를 위해서는 제 2a 도와 같이 4개의 수광소자(A,B,C,D)와 비교기(COM1)를 이용하여 포커스 에러신호를 발생시키고, 이들 수광소자(A,B,C,D)에서 발생되는 전류를 전류/전압변환기(I/V)에서 전압신호로 변환시켜 증폭기(AMP)에서 증폭시킴으로서 정보신호를 얻었다. 또한, 트랙킹(TRACKING)을 위해서는 제 2b 도와 같이 수광소자(E,F)와 발광소자(G)를 두어 발광소자(G)에서 발생된 비임을 수광소자(E,F)가 감지하여 비교기(COM2)에서 트랙킹 에러신호를 발생하였다. 뿐만아니라 디스크의 기울기를 보정하기 위해서는 제 2c 도와 같이 두개의 수광소자(H,I)와 한개의 발광소자(J)를 설치하고, 수광소자(H,I)에서 수광된 광량을 비교기(COM3)에서 비교하여 기울기 에러신호를 발생시켰었다.In the conventional optical pickup apparatus, in order to correct an inclination of the disk 1 and output an accurate signal, as shown in FIG. 1, the light emitting device 2 and the light receiving device 3 are separately provided outside the pickup. The slope of 1) was corrected. In other words, in the conventional pickup, the focus error signal is generated by using the four light receiving elements A, B, C, and D and the comparator COM1 for the focus FOCUS as shown in FIG. 2A. The information signal was obtained by converting the current generated by the signals B, C, and D into a voltage signal in the current / voltage converter (I / V) and amplifying the current in the amplifier AMP. In addition, for tracking (TRACKING), as shown in FIG. 2B, the light receiving elements E and F and the light emitting elements G are disposed so that the light receiving elements E and F sense the beams generated by the light emitting elements G and the comparator COM2. ) Has generated a tracking error signal. In addition, in order to correct the inclination of the disk, two light receiving elements H and I and one light emitting element J are installed as shown in FIG. 2C, and the amount of light received by the light receiving elements H and I is compared to the comparator COM3. The slope error signal was generated in comparison with.

그러나, 이와같은 종래의 픽업장치는 기울기 보정을 위해서는 발광소자(J)를 별도로 설치해야만 하므로 그의 구조 및 가격이 비싸게 되는 결점이 있었다.However, such a conventional pickup device has a drawback that the structure and the price thereof are expensive since the light emitting device J must be separately installed in order to correct the tilt.

따라서, 본 발명은 이러한 사정을 감안하여 안출한 것으로서, 발광부를 별도로 설치하지 않고서 대물렌즈와 함께 기울기 보정용 수광소자가 이동되도록 설치함으로써 기울기 보정을 민감하게 하기 위한 기울기 보정형 픽업장치를 제공하는데 그 목적이 있다.Accordingly, the present invention has been made in view of the above circumstances, and provides a tilt correction type pickup device for sensitively tilt correction by installing the tilt correction light receiving element to move together with the objective lens without separately installing the light emitting unit. There is this.

이러한 목적을 달성하기 위한 본 발명은 포커싱 및 기록정보 판독을 위해 적어도 4개의 수광소자 및 대물렌즈를 구비한 픽업장치에 있어서, 대물렌즈의 측면에 장착되어 대물렌즈에서 발사되어 디스크에 의해 반사된 광량을 수광하여 디스크의 기울기를 보정하기 위한 2개의 수광소자로 구성시켜서 된 것이다.In order to achieve the above object, the present invention provides a pickup device having at least four light-receiving elements and an objective lens for focusing and reading recorded information, wherein the amount of light emitted from the objective lens and reflected by the disk is mounted on the side of the objective lens. It consists of two light-receiving elements for receiving the light and correcting the tilt of the disk.

이하, 본 발명을 첨부된 도면에 의거하여 상세히 설명하면 다음과 같다.Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

제 3 도는 본 발명에 따른 기울기 보정형 픽업장치의 개략도를 도시한 것인바, 픽업본체(10)에 있는 대물렌즈 발광부(11)의 외측 즉, 대물렌즈 보호필터(12)의 상측에는 2개의 수광소자(13A,13B)를 설치하고, 가요성 도선(14A,14B)을 제 4 도에 도시한 전류/전압변환기(I/V1,I/V2)에 각각 연결하였다. 제 4 도에 있어서 제 2 도와 유사한 참조번호는 유사한 부품을 표시한다.Figure 3 shows a schematic diagram of the tilt correction type pickup apparatus according to the present invention, the outer side of the objective light emitting portion 11 of the pickup body 10, that is, the upper side of the objective lens protection filter 12 The light receiving elements 13A and 13B were provided, and the flexible conductors 14A and 14B were connected to the current / voltage converters I / V1 and I / V2 shown in FIG. In Fig. 4, reference numerals similar to those of Fig. 2 denote similar parts.

우선, 디스크(1)가 제 3 도와 같이 기울어져 있을 경우 수광소자(13A,13B)에서 감지하는 빛의 양은 틀리게 된다. 즉, 수광소자(13A)는 수광소자(13B)보다 많은량의 빛을 감지하게 되는바, 수광소자(13A,13B)는 모두 입사되는 광량에 비례한 전기신호를 출력하므로 수광소자(13A)의 높은 전기값과 수광소자(13B)의 낮은 전기값이 전류/전압변환기(I/V1,I/V2)에 각각 인가되어 전압신호로서 변환된 뒤 전류 전압변환기(I/V1)의 출력은 비교기(COM10)(COM11)의 비반전입력단(-)으로 인가되면서 전류 전압변환기(I/V2)의 출력은 비교기(COM10)(COM11)의 반전입력단(-)으로 입력되어 각각 비교되고 그 출력이 증폭기(AMP10)(AMP11)에 인가되어 증폭된 후 각각 디스크의 기울기 보정 또는 트래킹에러의 수정을 위한 전압치로 출력된다.First, when the disk 1 is inclined with the third degree, the amount of light detected by the light receiving elements 13A and 13B is incorrect. That is, the light receiving element 13A detects a greater amount of light than the light receiving element 13B, and since the light receiving elements 13A and 13B both output an electric signal proportional to the amount of incident light, the light receiving element 13A After the high electric value and the low electric value of the light receiving element 13B are applied to the current / voltage converters I / V1 and I / V2, respectively, and converted into voltage signals, the output of the current voltage converter I / V1 is converted into a comparator ( While applied to the non-inverting input terminal (-) of COM10 (COM11), the output of the current voltage converter (I / V2) is input to the inverting input terminal (-) of the comparator (COM10) (COM11) and compared respectively, the output of the amplifier ( AMP10) and AMP11 are applied and amplified and output as voltage values for correcting the tilt of the disk or correcting the tracking error, respectively.

이와같이 동작하는 본 발명은 종래와 같이 기울기 보정을 위해 발광부를 별도로 설치하지 않기 때문에 픽업의 구조가 간단해질 뿐만 아니라, 그에 따른 제조원가가 저렴하며, 수광소자(13A,13B)가 대물렌즈와 함께 이동하므로 기울기 보정이 보다 민감하게 이루어질 수 있는 특징을 지닌것이다.In the present invention operating as described above, since the light emitting unit is not separately provided for the tilt correction as in the related art, not only the pickup structure is simplified, but also the manufacturing cost is low, and the light receiving elements 13A and 13B move together with the objective lens. It is a characteristic that the tilt correction can be made more sensitive.

Claims (1)

포커싱 및 기록정보 판독을 위한 적어도 4개의 수광소자 및 대물렌즈를 구비한 픽업장치에 있어서 ; 상기 대물렌즈의 측면에 장착되어 대물렌즈에서 발사되어 디스크에 의해 반사된 광량을 수광하여 디스크(1)의 기울기 및 트랙킹에러를 보정하기 위한 2개의 수광소자(13A)(13B)로 구성됨을 특징으로 하는 기울기 보정형 픽업장치.A pickup apparatus comprising at least four light receiving elements and an objective lens for focusing and reading recorded information; And two light receiving elements 13A and 13B mounted on the side of the objective lens to receive the amount of light emitted from the objective lens and reflected by the disk to correct the tilt and tracking error of the disk 1. Tilt correction type pickup device.
KR1019900008207A 1990-06-04 1990-06-04 Optical pick-up device KR930008454B1 (en)

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KR930008454B1 true KR930008454B1 (en) 1993-09-04

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101251645B1 (en) * 2006-04-18 2013-04-05 엘지전자 주식회사 Recording and/or reproducing apparatus and method thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101251645B1 (en) * 2006-04-18 2013-04-05 엘지전자 주식회사 Recording and/or reproducing apparatus and method thereof

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