KR930004911Y1 - Laser device of disk - Google Patents

Laser device of disk Download PDF

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Publication number
KR930004911Y1
KR930004911Y1 KR2019880008468U KR880008468U KR930004911Y1 KR 930004911 Y1 KR930004911 Y1 KR 930004911Y1 KR 2019880008468 U KR2019880008468 U KR 2019880008468U KR 880008468 U KR880008468 U KR 880008468U KR 930004911 Y1 KR930004911 Y1 KR 930004911Y1
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South Korea
Prior art keywords
laser
polarization
polarizer
hologram
laser beam
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KR2019880008468U
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Korean (ko)
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KR890023594U (en
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양근영
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주식회사 금성사
최근선
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Publication of KR890023594U publication Critical patent/KR890023594U/en
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Publication of KR930004911Y1 publication Critical patent/KR930004911Y1/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
    • G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
    • G11B7/0065—Recording, reproducing or erasing by using optical interference patterns, e.g. holograms
    • 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
    • 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
    • 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
    • G11B7/1372—Lenses

Abstract

내용 없음.No content.

Description

홀로그램을 이용한 레이저 주사장치Laser scanning device using hologram

제1도는 정면에서 본 고안의 광학계 구성도.1 is a schematic diagram of an optical system of the present invention.

제2도는 제1도의 평면도.2 is a plan view of FIG.

제3도는 홀로그램 디스크의 평면도.3 is a plan view of a hologram disk.

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

1 : 홀로그램 2 : 홀로그램디스크1: hologram 2: hologram disc

3 : 레이저 4 : 콜리메이터3: laser 4: collimator

5, 6 : 편광자 7 : 액정5, 6: polarizer 7: liquid crystal

13 : 분극스플리터 14 : 접속렌즈13 polarization splitter 14 connection lens

15 : 광검지기 16 : 핀홀15: light detector 16: pinhole

본 고안은 레이저 주사장치(Laser scanning system)에 관한 것으로, 특히 레이저 빔(Laser beam)의 편광 특성을 이용하여 레이저 빔의 주사여부를 결정하며, 주사된 후 산란된 빔의 검지효율를 높이도록 한 홀로그램(Hologram)을 이용한 레이저 주사장치에 관한 것이다.The present invention relates to a laser scanning system, and in particular, to determine whether to scan a laser beam by using the polarization characteristics of the laser beam (Laser beam), a hologram to increase the detection efficiency of the scattered beam after scanning It relates to a laser scanning device using (Hologram).

본 고안을 첨부도면에 따라 상세히 설명하면, 제1도 및 제3도와 같이 다수개의 홀로그램(1)으로 구성된 레이저 빔 주사용 홀로그램디스크(2)를 모터(18)에 축착시킨다.When the present invention is described in detail with reference to the accompanying drawings, the laser beam scanning hologram disk 2 composed of a plurality of holograms 1 as shown in FIGS. 1 and 3 is condensed on the motor 18.

상기 홀로그램디스크(2)의 하방일측에 레이저(3)를 설치하고, 상기 레이저(3)의 전방에 레이저 빔을 시준(collimate)하는 클리메이터(4)를 설치하며, 상기 레이저(3)로부터 발생한 빔을 편광시키는 2개의 편광자(5)(6)를 상기 콜리메이터(4)의 전방에 위치되게 설치한다.A laser 3 is provided below one side of the hologram disk 2, a detector 4 collimating a laser beam in front of the laser 3 is provided, and the laser 3 is generated from the laser 3 Two polarizers 5 and 6 for polarizing the beam are placed in front of the collimator 4.

이때, 상기 편광자(5)와 (6)사이에 레이저 빔의 차단여부를 결정하는 액정(Liquid crystal)(7)를 설치하며, 상기 액정(7)의 양측에 투명전극판(8)(9)를 부착시킨다.In this case, a liquid crystal 7 is disposed between the polarizers 5 and 6 to determine whether the laser beam is blocked, and the transparent electrode plates 8 and 9 are disposed on both sides of the liquid crystal 7. Attach.

또한, 상기 투명전극판(8)(9)에 전압인가 여부를 결정하는 레이저 주사 시작신호 발생장치(10) 및 레이저 짐 온/오프장치(11)로 직렬로 접속연결한다.In addition, the transparent electrode plates 8 and 9 are connected in series to a laser scanning start signal generator 10 and a laser load on / off device 11 for determining whether a voltage is applied.

그리고, 상기 홀로그램디스크(2)의 직하방에 반사경(12)을 설치하여 상기 레이저(3), 콜리메이터(4), 편광자(5)(6), 액정(7)과 일직선상에 위치되게 하며, 이때 상기 반사경(12)을 경사지게 설치한 후 레이저 빔을 홀로그램디스크(2)로 반사되도록 광차단장치를 구성한다.In addition, a reflector 12 is disposed directly below the hologram disk 2 to be positioned in line with the laser 3, the collimator 4, the polarizer 5, 6, and the liquid crystal 7. At this time, the light shielding device is configured to reflect the laser beam to the hologram disk 2 after the reflector 12 is inclined.

상기 홀로그램디스크(2)와 반사경(12) 사이에 분극 스플리터(pola rization splitter)(13)를 설치하여 레이저(3)로부터 발생한 주사용 레이저 빔(a)은 100%통과시키고, 물체로부터 반사되어 되돌아오는 빔(b)는 분극 스플리터(13)의 타측에 설치된 집속렌즈(14)로 50%반사시키도록 한다.A polarization splitter 13 is provided between the hologram disk 2 and the reflector 12 so that the scanning laser beam a generated from the laser 3 passes through 100% and is reflected from the object and returned. The coming beam b is reflected by 50% with the focusing lens 14 installed on the other side of the polarization splitter 13.

상기 분극 스플리터(13)는 편광자(5)와 편광방향이 같도록 설치하고, 편광자(6)은 편광자(5)와 편광방향이 직각이 되도록 설치한다.The polarization splitter 13 is installed to have the same polarization direction as the polarizer 5, and the polarizer 6 is installed so that the polarization direction is perpendicular to the polarizer 5.

상기 집속렌즈(14)는 분극 스플리터(13)에 의해 반사된 빔을 접속하도록 한다.The focusing lens 14 connects the beam reflected by the polarization splitter 13.

상기 집속렌즈(14)는 전방에 광검지기(15)를 설치하며, 상기 광검지기(15)와 집속렌즈(14)사이에 핀홀(pinhole)(16)을 설치하여 주변이 빛이 광검지기(15)에 의해 검지되는 것을 최소로 한다.The focusing lens 14 is provided with a photodetector 15 in front, and a pinhole 16 is installed between the photodetector 15 and the focusing lens 14 so that light is surrounded by light. It is minimum to be detected by).

이때, 상기 핀홀(16)은 집속렌즈(14)의 촛점거리와 일치되게 한다.At this time, the pinhole 16 is matched with the focal length of the focusing lens 14.

상기 광검지기(15)를 데이타처리장치(17)에 연결시켜 광검지기(15)로부터의 신호를 분석, 처리하도록 광검지기 장치를 구성한다.The photodetector 15 is connected to the data processing device 17 to configure the photodetector device to analyze and process a signal from the photodetector 15.

미설명 부호 19는 물체이며, 20은 어떤표시이다.Reference numeral 19 is an object, and 20 is an indication.

이와 같이 구성된 본 고안의 작용효과를 설명하면, 레이저(3)로부터 발생한 빔은 편광자(6)를 통과한후 편광자(6)의 편광방향으로 편광되고, 편광된 빔은 편광방향을 회전시키는 액정(7)을 거쳐 편광자(5)에 입사된다.Referring to the operation and effect of the present invention configured as described above, the beam generated from the laser 3 is polarized in the polarization direction of the polarizer 6 after passing through the polarizer 6, the polarized beam is a liquid crystal (rotating the polarization direction ( It enters into the polarizer 5 via 7).

이때, 액정(7)에 편광바양을 90도 회전시키도록 전압이 인가되면 편광자(6)를 통과한 편광빔의 편광방향이 90도로 회전되어 편광자(5)의 편광방향과 일치하여 편광자(5)를 통과하게 된다.At this time, when a voltage is applied to the liquid crystal 7 to rotate the polarization bar by 90 degrees, the polarization direction of the polarization beam passing through the polarizer 6 is rotated by 90 degrees so that the polarizer 5 corresponds to the polarization direction of the polarizer 5. Will pass through.

만약 액정(7)에 전압이 인가되지 않으면 편광자(5)의 편광방향과 편광자(6)의 편광방향의 직각으로 되어 레이저 빔(a)의 편광자(5)를 통과하지 못하게 된다.If no voltage is applied to the liquid crystal 7, the polarization direction of the polarizer 5 and the polarization direction of the polarizer 6 are perpendicular to each other, thereby preventing the polarizer 5 of the laser beam a from passing through.

즉, 레이저 빔(a)의 차단여부는 액정(7)에 인가하는 전압여부에 따라 결정이 되는 것이다.That is, whether the laser beam a is blocked or not is determined depending on whether or not a voltage is applied to the liquid crystal 7.

액정(7)에 전압이 인가되어 편광된 빔(a)이 편광자(5)를 통과하면 이 빔은 반사경(12)에 의해 반사되어 분극 스플리터(13)로 입사된다.When voltage is applied to the liquid crystal 7 and the polarized beam a passes through the polarizer 5, the beam is reflected by the reflector 12 and is incident on the polarization splitter 13.

이때, 분극 스플리터(13)의 편광방향이 편광자(5)의 편광방향과 같으므로 입사된 편광빔(a)은 분극 스플리터(13)를 100%통과하게 되어 홀로그램디스크(2)로 입사한다.At this time, since the polarization direction of the polarization splitter 13 is the same as the polarization direction of the polarizer 5, the incident polarization beam a passes through the polarization splitter 13 at 100% and enters the hologram disk 2.

따라서 레이저 빔(a)은 홀로그램디스크(2)가 모타(18)에 의해 회전함에 따라 홀로그램(1)의 집속거리에 놓여진 물체나 스크린상에 주사된다.Therefore, the laser beam a is scanned on an object or a screen placed at the focal length of the hologram 1 as the hologram disk 2 is rotated by the motor 18.

물체(19)나 스크린상에 접속되어 주사되는 레이저 빔은 물체나 스크린으로 부터 산란되고, 산란된 빔(b)일부가 홀로그램(1)을 통과하여 분극 스필리터(13)에 입사된다.The laser beam connected and scanned on the object 19 or the screen is scattered from the object or the screen, and a part of the scattered beam b passes through the hologram 1 and is incident on the polarization splitter 13.

이때, 주사용 레이저 빔(a)이 물체(19)나 스크린에 의해 산란될때 편광특성이 사라지게 되어 산란된 빔(b)이 분극 스필리터(13)로 입사될때 50%는 분극 스플리터(13)를 통과하고, 50%는 반사되어 반사된 빔을 집속렌즈(14)에 의해 집속된 후 집속렌즈(14)촛점거리에 놓여 있는 핀홀(16)을 통과하여 광검지기(15)에 의해 검지된다.At this time, when the scanning laser beam a is scattered by the object 19 or the screen, the polarization characteristic disappears, and when the scattered beam b is incident on the polarization splitter 13, 50% of the scanning splitter 13 50% passes through the pinhole 16 at the focal length of the focusing lens 14 and is detected by the photodetector 15 after the reflected beam is focused by the focusing lens 14.

만약 물체(19)나 스크린에 어떤 표시(20)가 되어 있으면 표시가 되지 않은 부분에서 산란된 빔의 세기와, 표시가된 부분에서 산란된 빔의 세기가 다르게 광검지기(15)에 의해 검지되므로 물체나 스크린상에 표시된 해독, 분석할 수 있게 된다.If there is a mark 20 on the object 19 or the screen, the intensity of the beam scattered at the unmarked portion and the intensity of the scattered beam at the marked portion are detected by the photodetector 15 differently. Decode and analyze on objects or screens.

레이저 주사 시작신호 발생장치(10)는 레이저 주사계를 사용하는 장치의 물체자동감지 및 스위치등에 의한 신호로 이 신호가 레이저 빔 온/오프장치(1)에 인가될때 레이저 빔 온/오프장치(11)는 액정(7)에 전압을 인가한다.The laser scanning start signal generator 10 is a signal generated by the automatic detection and switching of objects of a device using a laser scanning system. When the signal is applied to the laser beam on / off device 1, the laser beam on / off device 11 ) Applies a voltage to the liquid crystal 7.

따라서, 본 고안은 레이저 빔의 편광특성을 이용하여 레이저가 온상태에서 주사용 레이저 빔의 온/오프를 결정하므로 레이저의 반복적인 온/오프에 의한 레이저 빔(Laser power)의 불안정과 레이저 수명단축 등을 방지하며, 분극 스플리터를 사용하므로써 레이저빔의 이용 효율을 증가시킬 수 있는 것이다.Therefore, the present invention uses the polarization characteristics of the laser beam to determine the on / off of the laser beam for scanning in the on-state of the laser, thereby reducing the instability and laser lifespan of the laser beam due to the repeated on / off of the laser. And the like, and by using a polarization splitter, the utilization efficiency of the laser beam can be increased.

예컨데, 일반적인 빔 스플리터를 사용할 경우 주사용 빔이 입사될때 50%나 감소되고, 50%감소된 빔이 반사되어 다시 스플리터에 입사될때 50%나 감소되어 결국 25%의 빔만이 광검지기에 검지된다.For example, when using a conventional beam splitter, the scanning beam is reduced by 50% when the incident beam is incident, and the 50% reduced beam is reflected and reduced by 50% when the incident beam enters the splitter so that only 25% of the beam is detected by the photodetector.

이에반해 분극 스플리터를 사용하면 50%빔이 광검지기에 검지되므로 검지광량부족에 의한 손실(Error)를 줄일 수가 있는 것이다.On the other hand, if a polarization splitter is used, 50% of the beams are detected by the photodetector, thereby reducing the error caused by the lack of detection light quantity.

Claims (2)

다수개의 홀로그램(1)으로 구성된 레이저 빔 주사용 홀로그램 디스크(2)를 모터(18)에 축착시키고, 상기 홀로그램디스크(2)의 하방일측에 후방에서 전방측으로 레이저(3), 콜리메이터(4), 편광자(6), 액정(7), 편광자(5), 반사경(12)순으로 각각 설치하고, 상기 편광자(5)와 (6)의 편광방향은 상호 직교하도록 설치하여 광차단장치를 구성하고, 상기 홀로그램디스크(2)와 반사경(12) 사이에 분극 스플리터(13)를 설치하여 상기 편광자(5)와 분극 스플리터(13)의 편광방향이 일치되도록 설치하고, 상기 분극 스플리터(13)의 전방에 집속렌즈(14)와 광검지기(15)를 각각 일직선상으로 설치하며, 상기 집속렌즈(14)와 광검지기(15) 사이에 핀홀(16)을 설치하는 한편 집속렌즈(14)의 촛점거리와 일치되게 핀홀(16)을 설치하여 광검지장치를 구성함을 특징으로 하는 홀로그램을 이용한 레이저 주사장치.The laser beam scanning hologram disk 2 composed of a plurality of holograms 1 is fixed to the motor 18, and the laser 3, collimator 4, from the rear side to the front side on the lower side of the hologram disk 2, The polarizer 6, the liquid crystal 7, the polarizer 5, and the reflector 12 are provided in this order, and the polarization directions of the polarizers 5 and 6 are installed so as to be perpendicular to each other to constitute a light blocking device. A polarization splitter 13 is provided between the hologram disk 2 and the reflector 12 so that the polarization directions of the polarizer 5 and the polarization splitter 13 are coincident with each other, and in front of the polarization splitter 13. The focusing lens 14 and the photodetector 15 are installed in a straight line, and the pinhole 16 is installed between the focusing lens 14 and the photodetector 15 and the focal length of the focusing lens 14 Use the hologram, characterized in that the optical detection device is configured by installing the pinhole 16 to match Laser scanning apparatus. 제1항에 있어서, 상기 광차단장치는 액정(7)에 전압을 인가하여 편광자(5)와 (6)의 편광방향이 일치되게 레이저 빔의 편광방향을 90도 회전시키도록 구성된 것을 특징으로 하는 홀로그램을 이용한 레이저 주사장치.2. The light blocking device according to claim 1, wherein the light blocking device is configured to rotate the polarization direction of the laser beam by 90 degrees by applying a voltage to the liquid crystal (7) so that the polarization directions of the polarizers (5) and (6) coincide. Laser scanning device using a hologram.
KR2019880008468U 1988-05-31 1988-05-31 Laser device of disk KR930004911Y1 (en)

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KR930004911Y1 true KR930004911Y1 (en) 1993-07-26

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