KR940001747Y1 - Laser pick-up device - Google Patents
Laser pick-up device Download PDFInfo
- Publication number
- KR940001747Y1 KR940001747Y1 KR2019890011291U KR890011291U KR940001747Y1 KR 940001747 Y1 KR940001747 Y1 KR 940001747Y1 KR 2019890011291 U KR2019890011291 U KR 2019890011291U KR 890011291 U KR890011291 U KR 890011291U KR 940001747 Y1 KR940001747 Y1 KR 940001747Y1
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- South Korea
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- lens
- optical
- laser beam
- laser
- reflective
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Classifications
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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
- G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
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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
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/125—Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
- G11B7/127—Lasers; Multiple laser arrays
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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
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/13—Optical detectors therefor
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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
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
- G11B7/1353—Diffractive elements, e.g. holograms or gratings
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- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Head (AREA)
- Diffracting Gratings Or Hologram Optical Elements (AREA)
Abstract
내용 없음.No content.
Description
제1도는 종래의 광픽업장치의 광학 계통도.1 is an optical system diagram of a conventional optical pickup device.
제2도는 본 고안의 광픽업장치 사시도.Figure 2 is a perspective view of the optical pickup device of the present invention.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
7 : 포토디렉터 9 : 반사형 홀로그램 렌즈7: PhotoDirector 9: Reflective Hologram Lens
10 : 투과형 홀로그램 렌즈10: transmission hologram lens
본 고안은 레이저 픽업장치에 관한 것으로, 회절격자 및 하프미터와 그밖의 대물렌즈와 조준렌즈 및 센서렌즈등의 구성이 필요없이 반사형및 투과형 홀로그램(HOLOGEAM)을 사용하여 광픽업장치를 구성하여 부품수감소는 물론 소형화 추세에 부응되기위한 목적으로 안출된 것이다.The present invention relates to a laser pick-up device, comprising an optical pickup device using a reflective and transmissive hologram (HOLOGEAM) without the need for a diffraction grating, a half meter, other objective lenses, aiming lenses, and sensor lenses. In order to meet the trend of miniaturization, as well as to reduce prisons.
먼저, 종래 레이저 픽업장치의 광학 계통도에 따라 그 구성 및 작용을 설명하면 도면 제1도에서와 같이 레이저빔 다이오드(1)와 3-빔 생성을 위한 회절격자(2) 및 경사 설치되는 하프미터(3) 그리고 광 디스크(8)측으로의 조존렌즈(4)와 대물렌즈(5) 및 그 대향측에는 센서렌즈(6) 및 정보검출을 위한 포토 디렉터(7)로 구성되는데, 레이저빔 다이오드(1)로부터 나온 광은 표면에 등간격으로 미소한 슬릿(Slit)이 새겨져 있는 회절격자(2)를 지나므로써 0차, ±1차의 회절광 3빔으로 나누어지고 하프미터(3)를 통하여 반사되어 조준렌즈(4)로 진입한다.First, the configuration and operation according to the optical system diagram of the conventional laser pickup apparatus will be described. As shown in FIG. 1, a laser beam diode 1, a diffraction grating 2 for generating a three-beam, and a half meter inclinedly installed 3) and the coexistence lens 4 and the objective lens 5 to the optical disk 8 side and the sensor lens 6 and the photo director 7 for information detection on the opposite side, the laser beam diode 1 The light from the light is passed through a diffraction grating (2) with tiny slits engraved on the surface and divided into three beams of zero-order and ± first-order diffracted light and reflected through a half meter (3). Enter the aiming lens (4).
이 조준렌즈에 의해 평행하게된 빔은 대물렌즈(5)에 의해 집속되어 광 디스크(8)에 조사된다.The beam parallelized by this aiming lens is focused by the objective lens 5 and irradiated to the optical disk 8.
상기와 같이 정보를 읽어 디스크(8)로부터 반사된 광은 다시 대물렌즈(5)와 조준렌즈(4)를 통하여 하프미터(3)에 이르게 되며, 이 빔은 반사되지 않고 투과되어 센서렌즈(6)를 통하여 포토디렉터(7)에 집속되고 그 집속된 빔으로부터 정보를 검출하는 것이 있다.The light reflected from the disk 8 by reading the information as described above reaches the half meter 3 again through the objective lens 5 and the aiming lens 4, and the beam is transmitted without being reflected and is transmitted to the sensor lens 6. Is focused on the photo director 7 and detects information from the focused beam.
그러나, 이러한 종래의 레이저 픽업장치는 개별 광학 소자를 최소한 5개이상을 필요로하며 각각의 광학소자의 광축을 맞추기가 대단히 까다로우며 조립구성에 의한 높이가 큰 이유로 광픽업 장치의 소형화에 장애요인이 되었던 것이었다.However, such a conventional laser pickup device requires at least five individual optical elements, it is very difficult to align the optical axis of each optical element, and the obstacles to the miniaturization of the optical pickup device due to the high height by the assembly configuration. It was to be.
따라서 본 고안은 이상과 같은 문제점을 해결 하고자, 회절격자 및 하프미러와 그밖의 대물렌즈와 조준렌즈 및 센서렌즈등의 구성을 완전 삭제시키고, 반사형 및 투과형 홀로그램을 사용하여 구성한 것으로 그 부품수를 대폭 축소시킴과 동시 소형화시키기에 적당하도록 된 것이다.Therefore, in order to solve the above problems, the present invention completely eliminates the configuration of diffraction gratings, half mirrors, other objective lenses, aiming lenses, and sensor lenses, and uses reflective and transmissive holograms. It is suitable to be greatly reduced and simultaneously downsized.
이하에서 이를 첨부된 양호한 실시예의 도면에 따라 상세히 설명하면 다음과 같다.Hereinafter, described in detail with reference to the accompanying drawings of the preferred embodiment as follows.
광디스크로부터 정보를 검출하여 재생 또는 기록토록 하는 광 레이저 픽업장치를 구성함에 있어서, 레이저빔 다이오드(1)의 주사빔 전방에 반사형 홀로그램렌즈(9)가 소정각도로 경사 설치되고 그 상부의 광디스크 저부에 투과형 홀로그램렌즈(10)가 위치됨과 동시 레이저빔 다이오드하부의 반사형 홀로그램렌즈 일측으로는 포토디렉터(7)가 세워설치된 것이다.In constructing an optical laser pickup apparatus for detecting and reproducing or recording information from an optical disc, a reflective hologram lens 9 is inclined at a predetermined angle in front of the scanning beam of the laser beam diode 1, and the upper portion of the optical disc is located on the upper portion thereof. The transmissive hologram lens 10 is positioned at the same time, and the photo director 7 is installed at one side of the reflective hologram lens under the laser beam diode.
이상과 같이 구성되는 본 고안 작동 상태를 살펴보면 레이저빔 다이오드(1)에서 나오는 빔(11)이 반사형홀로그램(9)의 재생시 참조광으로 되어 홀로그램렌즈(9)에 입사하여 90˚의 광로를 바꾼 반사형 홀로그램 0차 회절파(12)를 발생시킨다.Looking at the operating state of the present invention configured as described above, the beam 11 from the laser beam diode 1 becomes a reference light when the reflective hologram 9 is regenerated and enters the hologram lens 9 to change an optical path of 90 degrees. The reflective hologram zero-order diffraction wave 12 is generated.
이 0차 회절판(12)는 다시 투과형 홀로그램 렌즈(10)의 재생시 참조광으로 되어 투과형 홀로그램렌즈(10)의 0차 회절파(13)를 광디스크(8)에 집속시켜 정보를 읽는다.The zero-order diffraction plate 12 again becomes a reference light when the transmission hologram lens 10 is reproduced, focuses the zero-order diffraction wave 13 of the transmission hologram lens 10 on the optical disk 8 to read information.
광디스크(8)에서 집속 반사된 빔(14)은 투과형 홀로그램 렌즈(10)의 재생시 참조광으로 되어 0차 회절파(15)를 재생하고 이 재생광(15)은 반사형 홀로그램렌즈(9)에 의한 비점수차를 수반한 1차 회절파(16)를 재생하고 이 재생광은 포토 디렉터(7)에 집속되어 광디스크(8)의 정보검출, 비점수차방식에 의한 포커싱 에러검출, 푸시-풀방식에 의한 트렉킹에러 검출등을 행한다.The beam 14 focused on the optical disk 8 becomes a reference light during reproduction of the transmission hologram lens 10 to reproduce the zeroth order diffraction wave 15, and this reproduction light 15 is applied to the reflection hologram lens 9. The first diffraction wave 16 accompanied by astigmatism caused by the astigmatism is reproduced, and the reproduced light is focused on the photo director 7 to detect the information of the optical disc 8, detect the focusing error by the astigmatism method, and push-pull method. Tracking error is detected.
이때, 포커싱에러 검출은 반사형 홀로그램렌즈(9)의 설계시에 프로세서를 이용한 홀로그램 발생 방식에 의해 비점수차를 수반하는 홀로그램 기록파면을 제어함에 의한 비점수차 방식이다.At this time, the focusing error detection is an astigmatism method by controlling the hologram recording wave surface with astigmatism by a hologram generation method using a processor when designing the reflective hologram lens 9.
이상과 같이 구성되고 작용되는 본 고안은, 광픽업장치를 구성함에 있어서 광학소자 부품수를 대폭감소하여 조립공수의 절감및 조립공차의 정밀성이 보장되며 광회절효율이 매우 높으며 소형화가 가능한 레이저 픽업장치를 제공하는 효과가 있다.The present invention, which is constructed and operated as described above, greatly reduces the number of optical element components in the construction of an optical pickup device, thereby reducing the number of assembly operations and ensuring the precision of assembly tolerances, and having a high optical diffraction efficiency and miniaturization. Has the effect of providing.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019890011291U KR940001747Y1 (en) | 1989-07-31 | 1989-07-31 | Laser pick-up device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019890011291U KR940001747Y1 (en) | 1989-07-31 | 1989-07-31 | Laser pick-up device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR910003077U KR910003077U (en) | 1991-02-26 |
| KR940001747Y1 true KR940001747Y1 (en) | 1994-03-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR2019890011291U KR940001747Y1 (en) | 1989-07-31 | 1989-07-31 | Laser pick-up device |
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| Country | Link |
|---|---|
| KR (1) | KR940001747Y1 (en) |
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1989
- 1989-07-31 KR KR2019890011291U patent/KR940001747Y1/en not_active IP Right Cessation
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| Publication number | Publication date |
|---|---|
| KR910003077U (en) | 1991-02-26 |
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