KR920004161Y1 - Optical drum of recording and reproducing apparatus of optical tape - Google Patents
Optical drum of recording and reproducing apparatus of optical tape Download PDFInfo
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- KR920004161Y1 KR920004161Y1 KR2019910017366U KR910017366U KR920004161Y1 KR 920004161 Y1 KR920004161 Y1 KR 920004161Y1 KR 2019910017366 U KR2019910017366 U KR 2019910017366U KR 910017366 U KR910017366 U KR 910017366U KR 920004161 Y1 KR920004161 Y1 KR 920004161Y1
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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
- G11B7/002—Recording, reproducing or erasing systems characterised by the shape or form of the carrier
- G11B7/003—Recording, reproducing or erasing systems characterised by the shape or form of the carrier with webs, filaments or wires, e.g. belts, spooled tapes or films of quasi-infinite extent
- G11B7/0031—Recording, reproducing or erasing systems characterised by the shape or form of the carrier with webs, filaments or wires, e.g. belts, spooled tapes or films of quasi-infinite extent using a rotating head, e.g. helicoidal recording
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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
- G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
- G11B7/1395—Beam splitters or combiners
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- Optics & Photonics (AREA)
- Optical Head (AREA)
- Optical Recording Or Reproduction (AREA)
Abstract
내용 없음.No content.
Description
제 1 도는 본 고안의 사용상태 전체사시도.1 is a perspective view of the state of use of the present invention.
제 2a 도는 본 고안의 결합상태 측단면도, (b)는 대물렌즈의 경통구조 단면도.Figure 2a is a side cross-sectional view of the engaged state of the present invention, (b) is a cross-sectional view of the barrel structure of the objective lens.
제 3 도는 본 고안의 광학계의 대략 구성도.3 is a schematic diagram of an optical system of the present invention.
제 4 도는 본 고안의 광로에 대한 개념도.4 is a conceptual diagram of an optical path of the present invention.
제 5 도는 본 고안의 타실시예에 따른 광학계의 개략 구상도.5 is a schematic schematic diagram of an optical system according to another embodiment of the present invention.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
A : 외부광학계 B : 외부광학계A: external optical system B: external optical system
1 : 광 테이프 2 : 광드럼1: optical tape 2: optical drum
2a : 상부드럼 3 : 레이저 다이오드2a: upper drum 3: laser diode
4 : 콜리메이팅렌즈 5 : 광분할기4: collimating lens 5: light splitter
5a : ¼ 파장판 6 : 전반사경5a: ¼ wave plate 6: total reflection mirror
7 : 편광광분할기 7a : ¼ 파장판7: polarized light splitter 7a: ¼ wavelength plate
7b : 전반사막 "A" 8 : 대물렌즈7b: Total reflection film "A" 8: Objective lens
9 : 경통 9a : 외부경통9: barrel 9a: outer barrel
9b : 내부경통 10 : 홀로그램광학소자9b: inner barrel 10: hologram optical element
11 : 전반사경 "A" 12 : 전반사경 "B"11: Total mirror "A" 12: Total mirror "B"
13 : 광검출기13: photodetector
본 고안은 광테프에 광신호를 기록하거나 또는 광테이프에 기록된 광신호를 재생하는 기록 재생장치의 광드럼에 관한 것으로 특히, 발광소자 및 검출기 등으로 구성되는 광학계를 드럼 외부에 설치하여 조립 구조를 보다 간단히 하고 신호대(對)잡음비를 개선한 광테이프의 기록재생장치의 광드럼에 관한 것이다.The present invention relates to an optical drum of a recording and reproducing apparatus for recording an optical signal on an optical tape or reproducing an optical signal recorded on an optical tape. In particular, an assembly structure is provided by installing an optical system including a light emitting element and a detector outside the drum. The present invention relates to an optical drum of a recording / reproducing apparatus of an optical tape, which has a simpler and improved signal-to-noise ratio.
일반적으로 광기록매체는 자기기록매체에 비하여 약100배 정도의 기록밀도로 정보를 저장할 수 있을뿐 아니라 신호대 잡음비(S/N)도 높아 정보기록 분야에서 중요한 기술로 주목받고 있다.In general, optical recording media are not only able to store information at a recording density of about 100 times that of magnetic recording media, but also have a high signal-to-noise ratio (S / N), which has attracted attention as an important technology in the field of information recording.
그러나 이와같은 광학적 정보 기록 기술의 사용은 주로 광디스크에 국한되어 왔으며 현재 디지탈 VTR의 기록매체로 사용되는 자기테이프나 광디스크가 사용되고 있다.However, the use of such optical information recording technology has been mainly limited to optical disks, and magnetic tapes or optical disks used as recording media of digital VTRs are currently used.
영상신호를 디지탈신호로 처리할 경우 그 주파수가 20MHz이상이 되기 때문에, 자기기록방식인 경우에는 자기헤드에서 발생하는 신호가 미약할 뿐만 아니라 현재의 VHS용 비디오테이프를 사용시에는 기록시간이 한 시간정도 이고 광디스크 기록방식인 경우 30분 정도로 한정되었다.When the video signal is processed as a digital signal, the frequency is 20MHz or more. Therefore, in the magnetic recording method, the signal generated from the magnetic head is not only weak, but the recording time is about one hour using the current VHS video tape. In the case of the optical disc recording method, it is limited to about 30 minutes.
따라서 이와같은 문제점을 개선하기 위하여 광테이프를 사용하는바, 이 광테이프에 기록된 정보를 읽는 광테이프용 기록재생장치는 전류가 인가되면 레이저광선을 발광하는 레이저 다이오드 및 광검출기를 회전하는 상부드럼내부에 설치하고, 아울러 외부 회로와 상기 레이저 다이오드 및 광 검출기를 연결하는 수단으로서 브러쉬와 자기 트랜스를 설치하여 사용하였다.Therefore, in order to improve the problem, an optical tape is used. An optical tape recording and reproducing apparatus for reading information recorded on the optical tape has an upper drum which rotates a laser diode and a photodetector that emit a laser beam when a current is applied. It installed inside and used the brush and the magnetic transformer as a means to connect an external circuit, the said laser diode, and a photodetector.
이 경우 브러쉬에서 잡음이 발생하거나 자기트랜스의 주파수 한계 때문에 20MHz이상에서는 정보기록이 불가능하다는 문제점이 제기되었다.In this case, a problem arises that noise is not generated in the brush or that information recording is not possible above 20 MHz due to the frequency limit of the magnetic transformer.
본 고안은 광드럼의 구조를 간단하게 하기 위하여 발광소자, 집속렌즈 및 광분할기를 포함하는 특정광학계를 광학드럼의 외부에 설치한 광기록재생장치의 광드럼을 제공하는데 있다. 본 고안에 의한 광드럼의 구조는 광드럼 외부에 형성된 외부광학계와 광드럼내부에 형성된 내부광학계로 크게 분리된다.The present invention provides a light drum of an optical recording and reproducing apparatus in which a specific optical system including a light emitting element, a focusing lens, and a light splitter is provided outside the optical drum in order to simplify the structure of the light drum. The structure of the optical drum according to the present invention is largely divided into an external optical system formed outside the optical drum and an internal optical system formed inside the optical drum.
즉, 상기 외부광학계는 전류의 인가에 의하여 레이저빔을 발광하는 레이저 다이오드와, 상기 레이저빔을 평행광으로 변화시켜 주는 콜리메이팅(Collmating)렌즈와, 그 전면에 형성된 광분할기와, 이 광분할기를 거친 레이저빔을 원편광으로 변화시켜주는파장판 및, 입사된 원편광을 드럼 내부의 드럼축상에 장치된 편광광분할기로 직각 반사시켜주는 전반사경을 포함한다.That is, the external optical system includes a laser diode that emits a laser beam by applying an electric current, a collimating lens that converts the laser beam into parallel light, a light splitter formed on the front surface thereof, and the light splitter. To transform a rough laser beam into circularly polarized light And a wave plate and a total reflection mirror for reflecting the incident circularly polarized light at right angles to a polarized light splitter installed on a drum axis inside the drum.
상기 내부광학계는 상기 드럼 축상의 내부에 상기 전반사경의 반사에 의하여 드럼축상을 진행하여 입사된 레이저빔을 50%씩 반사 및 투과시키기 위해 하부에 전반사막을 설치하고 아울러 대각선 방향으로파장판이 형성된 편광 광분할기와, 이 편광 광분할기로 부터 제공된 레이저빔을 좌우로 접속하는 대물렌즈를 포함한다.The internal optical system installs a total reflection film at the bottom to reflect and transmit the incident laser beam by 50% by advancing on the drum axis by reflection of the total reflection mirror inside the drum axis, and in a diagonal direction. And a polarization light splitter formed with a wave plate, and an objective lens for connecting the laser beam provided from the polarization light splitter to the left and right.
첨부된 도면에 의하여 본 고안의 실시예를 상세히 설명하면 다음과 같다.Referring to the embodiments of the present invention in detail by the accompanying drawings as follows.
본 고안은 제 1 도 및 제 2 도에 도시된 바와 같이 광테이프(1)에 데이타를 기록 및 재생하는 광드럼(2)에 있어서 상부 드럼(2a) 외부에 외부광학계(A)를 설치하고 상부드럼 내부에는 내부광학계(B)를 설치하여 구성한다.The present invention provides an external optical system A outside the upper drum 2a in the optical drum 2 for recording and reproducing data on the optical tape 1 as shown in FIGS. 1 and 2. The internal optical system B is installed inside the drum.
상기한 외부광학계(A)는 제 3 도에 도시된 바와 같이 전류가 인가되면 레이저빔을 발광(發光)하는 레이저다이오드(3)와, 상기 레이저빔을 평행광으로 변화시켜주는 콜리메이팅렌즈(4)와, 입사된 평행광을 제 4s 도에 도시된 바와같은 원평광으로 바꾸어 주는파장판(5a)과 광분할기 (5)및, 상기파장판(5a)을 통과한 원편광을 받아 상부드럼 내부의 드럼축상에 장치된 내부 광학계의 편광광분할기(7)로 전반사시켜 시켜주는 전반사경(6)으로 이루어진다.The external optical system A includes a laser diode 3 for emitting a laser beam when a current is applied as shown in FIG. 3, and a collimating lens 4 for converting the laser beam into parallel light. ) And convert the incident parallel light into circular flat light as shown in FIG. Wavelength plate 5a and light splitter 5, and It is composed of a total reflection mirror 6 which receives the circularly polarized light passing through the wave plate 5a and totally reflects it to the polarized light splitter 7 of the internal optical system installed on the drum shaft inside the upper drum.
또 상기 내부광학계(B)는 제 2 도와 제 3 도에 도시된 바와 같이 상부드럼(2a) 내부의 드럼축상에 설치되며 외부광학계(A)의 전반사경(6)으로 부터 평향된 레이저빔을 받아들여 레이저빔 광량의 50%를 좌측으로 반사시키고 나머지 50%는 제 4b 도와 같은 직선편광으로 투과시키는 편광 광분할기(7)와, 이 편광광분할기(7)를 중심으로 하여 좌우측에 설치되어 입사되는 레이저빔을 투과시켜 상부드럼(2a)에 형성된 좌우측구명을 통과하도록 하여 신호를 광테이프(1)에 기록시키거나 또는 광테이프 기록면의 반사율변화에 따라 광량이 변화된 레이저빔을 받아들이되 그 촛점이 상부드럼(2a)의 외주면에 정확히 맺히도록 구성된 대물렌즈(8)로 이루어진다.In addition, the internal optical system (B) is installed on the drum shaft inside the upper drum (2a) as shown in FIG. 2 and FIG. 3 and receives a laser beam that is flat from the total reflection mirror (6) of the external optical system (A). Polarized light splitter 7 for reflecting 50% of the amount of laser beam light to the left and transmitting the remaining 50% by linearly polarized light such as 4b degree, and is installed on the left and right sides of the polarized light splitter 7 to be incident The laser beam is transmitted to pass through the left and right lifespans formed in the upper drum 2a to record a signal on the optical tape 1 or to accept a laser beam whose light amount is changed in accordance with the change in reflectance of the optical tape recording surface. It consists of an objective lens 8 configured to be accurately formed on the outer circumferential surface of the drum 2a.
상기 편광 광분할기(7)에는 내부에서 대각선방향으로 형성된파장판(7a)과 내부하단에 형성된 전반사막(7b)으로 구성되어 있다.The polarized light splitter 7 is formed in a diagonal direction therein It consists of the wavelength plate 7a and the total reflection film 7b formed in the lower inner part.
이러한 구성에서, 상기 전반사경(6)으로 부터 직선편광으로 입사된 레이저빔이파장판(7a)을 통하여 아랫쪽으로 투과되면서 제 4c 도와 같은 우선광이 되고, 다시파장판(7a)하부에 형성된 전반사막(7b)에서 반사되어 제 4d 도에 도시된 바와같은 좌선광이 되며, 이렇게된 레이저빔은 다시파장판(7a)을 통과하여 올라 오면서 원래의 편광상 즉 제 4b 도와 같은 X측 방향의 직선편광과 수직을 이루는 Y측 방향의 직선편광 제 4e 도가 되고 편광광분할기(7)에 의하여 우측으로 반사되어 우측 대물렌즈로 향한다.In this configuration, the laser beam incident on the linearly polarized light from the total reflection mirror 6 It is transmitted downward through the wave plate 7a, and becomes the preferential light like the 4c degree. Reflected by the total reflection film 7b formed under the wave plate 7a, the left beam is shown as shown in FIG. 4D. As it passes through the wave plate 7a, it becomes the 4th degree of linearly polarized light in the Y-side direction perpendicular to the original polarized image, that is, the linearly polarized light in the X-direction, such as the fourth b degree, and is reflected to the right by the polarized light splitter 7. To the right objective lens.
이렇게 좌우측대물렌즈(8)를 통과한 레어저빔은 상부드럼(2a)의 좌우측 구멍을 통과하여 광테이프(1)의 기록면상에 촛점을 형성하여 기록 및 재생을 행하게 된다.The laser beam passing through the left and right objective lenses 8 passes through the left and right holes of the upper drum 2a to focus on the recording surface of the optical tape 1 to perform recording and reproduction.
한편 상기한 바와같이 편과광분할기(7)좌우에 설치되는 대물렌즈(8)는 그 촛점이 상부드럼(2a)의 외주면에 정확히 맺혀져야 하는바, 촛점심도가 1㎛ 정도이다.On the other hand, as described above, the objective lens 8 installed on the left and right side of the single light splitter 7 should have its focus exactly on the outer circumferential surface of the upper drum 2a, and the depth of focus is about 1 μm.
본 고안에서 N. A(Numerical Aperture : 개구수)가 0.4이상인 대물렌즈를 사용할 경우 광테이프(1)와 대물렌즈(8)사이의 거리오차를 ±0.5㎛ 이내로 잡아줘야 하는데 이를 위해서 제 2b 도에 도시된 바와 같이 피치 이동에 따른 직선구동이 가능하고 외부와 내부로 구분되는 경통(9)을 구성하여 내부경통(9b)에 대물렌즈를 고정시켜 내부경통(9b)을 시계방향 또는 시계반대방향으로 회전시키는 동작에 따라 외부경통(9a)내면에 형성된 피치에 따라 대물렌즈가 이동되어 광테이프(1)와 대물렌즈(8)사이의 거리를 정확히 조정할 수 있도록 한다. 이상과 같은 본 고안의 작용은 광기록시와 기록된 광신호의 재생시로 구분 설명할수 있는데 먼저 광기록은 상기한 계통순서에 따라 최종적으로 대물렌즈(8)를 통과한 레이저빔이 상부드럼의 좌우측구멍을 통하여 광드럼(2)의 외주면에 밀착하여 주행하는 광테이프(1)의 기록면상에 반사율 변화를 유기시켜 이루어지며 광신호재생은 반사율변화에 의하여 광량 변화된 레이저빔이 상기에서 설명한 투과순서와는 정반대로 투과되어 다시 광분할기(5)에 도달, 반사되어 광검출기(13)에 전류를 유기시키게 되면서 이루어진다.In the present invention, when using an objective lens having a N. A (Numerical Aperture) of 0.4 or more, the distance error between the optical tape 1 and the objective lens 8 should be kept within ± 0.5 μm. As shown in the figure, a straight line can be driven according to the pitch movement, and the barrel 9 is divided into the outside and the inside to fix the objective lens to the inner barrel 9b, thereby making the inner barrel 9b clockwise or counterclockwise. According to the rotating operation, the objective lens is moved according to the pitch formed on the inner surface of the outer barrel 9a so that the distance between the optical tape 1 and the objective lens 8 can be accurately adjusted. The operation of the present invention as described above can be divided into photooxyloxi and reproduction of recorded optical signals. First, optical recording is performed by the laser beam passing through the objective lens 8 according to the above system sequence. It is made by inducing reflectance change on the recording surface of the optical tape 1 traveling in close contact with the outer circumferential surface of the optical drum 2, and optical signal reproduction is different from the above-described transmission sequence in which the laser beam whose light amount is changed by the reflectance change is It is made while being transmitted in the opposite direction to reach the light splitter 5 again, to be reflected and to induce a current in the photodetector 13.
한편 광학적인 구성에 있어서파장판(7a)및 전반사 막 (7b)으로 구성된 편광광분할기(7)는 레이저빔의 광량을 50%씩 반분하여 좌우측 대물렌즈(8)로 보내주는 역할을 하는데, 이러한 구성 대신에 본 발며의 다른 실시예로서 제 5 도에 도시된 바와같이 하나의 레이저빔을 각각 50%의 광량을 갖는 두개의 레이저빔으로 만들어 줄 수 있는 홀로그램 광학소자(10)와 2개의 전반사경 (11) (12)으로 구성된 광학계를 사용할 수도 있다.On the other hand, in the optical configuration The polarized light splitter 7 composed of the wave plate 7a and the total reflection film 7b divides the amount of light of the laser beam by 50% and sends it to the left and right objective lenses 8 instead of the above configuration. As another example, as shown in FIG. 5, a hologram optical element 10 and two total reflection mirrors 11 and 12 which can make one laser beam into two laser beams each having a light quantity of 50%. It is also possible to use an optical system composed of.
이상과 같은 본 고안의 효과로는 광기록특유의 고밀도 기록과 테이프 특유의 대용량 기록이라는 장점을 살릴 수 있을 뿐만 아니라 현재의 VTR과 같이 자기 트랜스를 사용하지 않고 광기록신호를 신호대 잡음비(S/N)의 손실 없이 광검출기에서 직접독출하므로써 광테이프 사용을 보다 용이하게 해줄수 있다는 잇점이 있다.The effects of the present invention as described above can not only take advantage of the high density recording characteristic of optical recording and the large capacity recording characteristic of tape, but also use the optical recording signal without the use of a magnetic transformer like the current VTR. There is an advantage that it is easier to use the optical tape by reading directly from the photodetector without loss of).
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019910017366U KR920004161Y1 (en) | 1988-09-30 | 1991-10-17 | Optical drum of recording and reproducing apparatus of optical tape |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019880012875A KR900005394A (en) | 1988-09-30 | 1988-09-30 | Optical tape recorder |
| KR2019910017366U KR920004161Y1 (en) | 1988-09-30 | 1991-10-17 | Optical drum of recording and reproducing apparatus of optical tape |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1019880012875A Division KR900005394A (en) | 1988-09-30 | 1988-09-30 | Optical tape recorder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| KR920004161Y1 true KR920004161Y1 (en) | 1992-06-22 |
Family
ID=26627911
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR2019910017366U Expired KR920004161Y1 (en) | 1988-09-30 | 1991-10-17 | Optical drum of recording and reproducing apparatus of optical tape |
Country Status (1)
| Country | Link |
|---|---|
| KR (1) | KR920004161Y1 (en) |
-
1991
- 1991-10-17 KR KR2019910017366U patent/KR920004161Y1/en not_active Expired
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