KR0119713Y1 - Deflection detecting device of optical pick-up - Google Patents
Deflection detecting device of optical pick-upInfo
- Publication number
- KR0119713Y1 KR0119713Y1 KR92018688U KR920018688U KR0119713Y1 KR 0119713 Y1 KR0119713 Y1 KR 0119713Y1 KR 92018688 U KR92018688 U KR 92018688U KR 920018688 U KR920018688 U KR 920018688U KR 0119713 Y1 KR0119713 Y1 KR 0119713Y1
- Authority
- KR
- South Korea
- Prior art keywords
- voltage
- value
- maximum
- output
- amplifying
- Prior art date
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 35
- 238000001514 detection method Methods 0.000 claims description 8
- 230000003321 amplification Effects 0.000 claims description 4
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 4
- 239000003381 stabilizer Substances 0.000 claims description 4
- 239000004973 liquid crystal related substance Substances 0.000 claims description 3
- 230000000087 stabilizing effect Effects 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
Classifications
-
- 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
- G11B7/095—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 specially adapted for discs, e.g. for compensation of eccentricity or wobble
- G11B7/0953—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 specially adapted for discs, e.g. for compensation of eccentricity or wobble to compensate for eccentricity of the disc or disc tracks
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
- G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
- G11B27/34—Indicating arrangements
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optical Recording Or Reproduction (AREA)
Abstract
트랙중심에 대한 광픽업의 편심정도를 검출하는 장치는, 아날로그전압 형태로 입력하는 트랙킹에러신호의 양의 최대전압값, 음의 최대전압값, 및 두 전압을 가산한 전압가산값을 이용하여 광픽업의 편심정도를 검출하는 장치의 회로구성을 간략히 함으로써, 그 장치의 생산비용을 절감할 수 있는 효과가 있다.The apparatus for detecting the eccentricity of the optical pickup with respect to the track center is provided by using a positive maximum voltage value, a negative maximum voltage value, and a voltage addition value obtained by adding two voltages. By simplifying the circuit configuration of the device for detecting the degree of eccentricity of the pickup, the production cost of the device can be reduced.
Description
제1도는 본 고안의 바람직한 일 실시예에 따른 트랙중심에 대한 광픽업의 편심검출장치.1 is an eccentric detection apparatus of optical pickup for a track center according to a preferred embodiment of the present invention.
*도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
11,12:최대값검출기 13:차동증폭기11, 12: Maximum detector 13: Differential amplifier
14:전압가산값발생기 15:안정화기14: Voltage addition generator 15: Stabilizer
16,21:연산증폭기 17,18:대수증폭기16, 21: operational amplifier 17, 18: logarithmic amplifier
19:비교기 20:역대수증폭기19: comparator 20: history amplifier
22:A/D변환기 23:디지탈표시기22: A / D converter 23: Digital display
본 고안은 트랙중심에 대한 광픽업의 편심검출장치에 관한 것으로서, 특히, 컴팩트디스크 플레이어, 레이저디스크 플레이어 등과 같이 광픽업을 이용하는 시스템에서 광픽업의 트랙중심에 대한 편심(deflection)정도를 검출하는 장치에 관한 것이다.The present invention relates to an apparatus for detecting an eccentricity of an optical pickup for a track center, and in particular, an apparatus for detecting a degree of deflection of a track center for an optical pickup in a system using an optical pickup such as a compact disc player or a laser disc player It is about.
광픽업의 반도체레이저광원에서 발생하여 광디스크로 투사되는 빛은 광디스크에서 반사하면서 산란되므로, 광검출기에서 검출될 때는 광의 손실이 발생한다. 광픽업은 이와 같은 광손실의 차이를 이용해 광디스크로부터 정보를 읽어낸다. 그런데, 광디스크는 제조공정상에서 뒤틀림이나 디스크 중심구멍에 편차가 발생하므로, 광픽업이 광디스크에 형서오딘 트랙의 중심선상을 정확히 트랙킹하지 못하는 문제가 발생한다.Since the light generated from the semiconductor laser light source of the optical pickup and projected onto the optical disc is scattered while being reflected from the optical disc, light loss occurs when detected by the photodetector. The optical pickup uses the difference in optical loss to read information from the optical disc. However, since the optical disc is warped in the manufacturing process or a deviation occurs in the center hole of the disc, there is a problem that the optical pickup does not accurately track the center line of the formodine track on the optical disc.
이와 같은 문제점을 해결하기 위하여, 종래에는 광픽업에 구비된 편심 검출장치를 이용하여 광디스크에 대한 광픽업의 편심정도를 검출하며, 검출된 편심정도에 따라 광픽업의 구동이 조절되었다. 그러나, 광디스크의 편심정도를 검출하는 종래의 장치들은 마아콤 등을 이용하여 회로를 구성하였기 때문에 그 장치의 가격이 상승하는 문제점이 있었다.In order to solve such a problem, conventionally, the eccentricity of the optical pickup for the optical disc is detected by using the eccentricity detection device provided in the optical pickup, and the driving of the optical pickup is controlled according to the detected eccentricity. However, the conventional apparatuses for detecting the degree of eccentricity of the optical disk have a problem in that the price of the apparatus is increased because the circuit is formed by using a macacom.
상기의 문제점을 해결하기 위한 본 고안의 목적은, 간단한 회로구성으로써 광디스크에 대한 광픽업의 편심정도를 검출 및 표시할 수 있는 트랙중심에 대한 광픽업의 편심검출장치를 제공함에 있다.An object of the present invention for solving the above problems is to provide an eccentric detection apparatus for optical pickup with respect to a track center capable of detecting and displaying the eccentricity of optical pickup for an optical disk with a simple circuit configuration.
이와 같은 본 고안의 목적을 달성하기 위한, 트랙중심에 대한 광픽업의 편심(deflection)정도를 검출하는 장치는, 입력하는 트랙킹에러신호로부터 양의 최대전압값 및 음의 최대전압값을 검출하는 최대값검출수단; 상기양의 최대전압값 및 음의 최대전압값을 입력받아 두 최대값을 가산하여 가산값을 출력하는 가산값생성수단; 상기 가산값생성수단으로부터 출력되는 상기 가간값을 1/2배 증폭하며, 상기 최대값검출수단에서 출력되는 양의 최대전압값과 음의 최대전압값의 차이값을 산출하며, 산출된 차이값을 출력하는 전압증폭수단; 및 상기 전압증폭수단으로부터 상기 전압차이값 및 전압가산값을 수신 및 비교하여, 트랙중싱메 대한 광픽업의 편심정도를 나타내는 편심정도신호를 발생하는 비교수단을 포함한다.In order to achieve the object of the present invention, the apparatus for detecting the degree of deflection of the optical pickup with respect to the track center has a maximum of detecting a positive maximum voltage value and a negative maximum voltage value from an input tracking error signal. Value detecting means; Addition value generating means for receiving the positive maximum voltage value and the negative maximum voltage value, adding two maximum values, and outputting an added value; Amplifying the interval value output from the addition value generating means by 1/2 times, calculating a difference value between the positive maximum voltage value and the negative maximum voltage value output from the maximum value detecting means, and calculating the calculated difference value. Voltage amplifying means for outputting; And comparing means for receiving and comparing the voltage difference value and the voltage addition value from the voltage amplifying means, and generating an eccentricity signal indicating an eccentricity of the optical pickup for the track weighting method.
이하, 본 고안의 바람직한 일 실시예에 따른 트랙중심에 대한 광픽업의 편심검출장치를 첨부된 도면을 참조하여 상세히 설명한다.Hereinafter, an eccentric detection apparatus of an optical pickup for a track center according to an exemplary embodiment of the present invention will be described in detail with reference to the accompanying drawings.
제1도는 본 고안의 바람직한 일 실시예에 따른 트랙중싱에 대한 광픽업의 편심검출장치를 나타낸 회로도이다.1 is a circuit diagram showing an eccentric detection apparatus for optical pickup for track gravity according to a preferred embodiment of the present invention.
제1도의 장치는, 제1최대값검출기(11) 및 제2최대값검출기(12)를 구비한 최대값검출수단과, 전압가산값발생기(14) 및 안정화기(regulator)(15)를 구비한 가산값생성수단과, 차동증폭기(13) 및 제1연산증폭기(16)를 구비한 전압증폭수단과, 대수증폭기들(17,18)과 비교기(19) 및 역대수증폭기(20)를 구비한 비교수단, 그리고 제2연산증폭기(21)와 A/D변환기(22) 및 디지털 표시기(23)를 구비한 표시수단을 포함한다. 전술의 차동증폭기(13) 및 제1연산증폭기(16)는 차동증폭기(13)의 증폭비율이 '1'이면 제1연산증폭기(16)의 증폭비율은 '1/2'이 되도록 설계된다.The apparatus of FIG. 1 comprises a maximum value detecting means having a first maximum value detector 11 and a second maximum value detector 12, a voltage addition generator 14, and a regulator 15. A voltage amplification means having an addition value generating means, a differential amplifier 13 and a first operational amplifier 16, a logarithmic amplifiers 17 and 18, a comparator 19 and a logarithmic amplifier 20; One comparison means, and display means having a second operational amplifier 21, an A / D converter 22 and a digital display 23. The differential amplifier 13 and the first operational amplifier 16 described above are designed such that when the amplification ratio of the differential amplifier 13 is '1', the amplification ratio of the first operational amplifier 16 is '1/2'.
제1도의 장치로 아날로그전압형태의 트랙킹에러신호(TE)가 입력하면, 트랙킹에러신호(TE)의 입력단에 병렬연결된 제1 최대값검출기(11) 및 제2 최대값검출기(12)는 트랙킹에러신호(TE)로부터 최대값을 검출한다. 즉, 제1 최대값검출기(11)는 아날로그 전압의 양(+)의 최대전압값(DCP)을 검출하고 제2 최대값검출기(12)는 아날로그전압의 음(-)의 최대전압값(DCN)을 검출한다. 최대갑검출기들(11,12)에 의해 검출된 두 최대전압값들(DCP, DCN)은 최대값검출기들(11,12)들의 출력단들에 연결된 차동증폭기(13)로 입력한다. 두 최대값검출기들(11,12)의 출력단들에는 또한 소정의 저항들(R1, R2)이 연결되며, 저항들(R1, R2)간의 접합점(a)에는 전압가산값발생기(14)의 입력단이 연결된다.When the tracking error signal TE of the analog voltage type is input to the apparatus of FIG. 1, the first maximum value detector 11 and the second maximum value detector 12 connected in parallel to the input terminal of the tracking error signal TE are connected to the tracking error. The maximum value is detected from the signal TE. That is, the first maximum value detector 11 detects the positive maximum voltage value DC P of the analog voltage, and the second maximum value detector 12 detects the negative maximum voltage value of the analog voltage ( DC N ) is detected. The two peak voltage values DC P and DC N detected by the peak detectors 11 and 12 are input to the differential amplifier 13 connected to the output terminals of the peak detectors 11 and 12. The resistors R 1 and R 2 are also connected to the output terminals of the two maximum detectors 11 and 12, and at the junction a between the resistors R 1 and R 2 , a voltage-added generator The input of 14) is connected.
차동증폭기(13)는 입력하는 두 최대전압값들(DCP, DCN)의 전압차이값(DCD)을 검출한다. 이 전압차이값(DCD)은 트랙킹에러신호(TE)의 진폭 또는 크기를 나타낸다. 전압가산값발생기(14)는 제1최대값검출기(11)로부터의 양의 최대값(DCP)과 제2 최대값검출기(12)로부터의 음의 최대값(DCN)을 가산하며, 그 결과의 전압가산값(DCA)을 산출한다. 전압가산값(DCA)은 광픽업이 주행하는 트랙이 갖는 트랙대칭성(symmetry)을 나타내는 것으로, 안정화기(15)로 입력되어 그 전압이 안정화된다. 제 1연산증폭기(16)는 안정화기(15)에서 출력되는 전압가산값(DCA)을 그 전압크기가 절반 크기(1/2 × DCA)가 되도록 증폭하여 출력한다. 증폭기들(13, 16)에서 출력되는 직류전압들(DCD, 1/2 × DCA)들은 제 1대수증폭기(17) 및 제2대수증폭기(18)로 각각 입력한다.The differential amplifier 13 detects a voltage difference value DC D between two input maximum voltage values DC P and DC N. This voltage difference value DC D represents the amplitude or magnitude of the tracking error signal TE. The voltage addition generator 14 adds the positive maximum value DC P from the first maximum value detector 11 and the negative maximum value DC N from the second maximum value detector 12. The resulting voltage addition value DC A is calculated. The voltage addition value DC A represents the track symmetry of the track on which the optical pickup travels, and is input to the stabilizer 15 to stabilize the voltage. The first operational amplifier 16 amplifies and outputs the voltage addition value DC A output from the stabilizer 15 so that the voltage size thereof is half the size (1/2 × DC A ). The DC voltages DCD, 1/2 × DC A output from the amplifiers 13 and 16 are input to the first log amplifier 17 and the second log amplifier 18, respectively.
대수증폭기들(17, 18)은 입력신호에 대수(logarithm)를 취하여 얻어진 전압값을 출력하는 것으로서, 제1대수증폭기(17)는 입력하는 전압차이값(DCD)에 대수를 취하여 얻어진 전압값(logDCD)을 출력하며, 제2대수증폭기(18)는 입력하는 전압가산값(1/2 × DCA)에 대수를 취하여 얻어진 다른 소정의 전압값(log (1/2 × DCA))을 출력한다. 대수증폭기들(17,18)의 출력단들에 연결된 비교기(19)는 비교의 기준이 되는 전압값(log(1/2 × DCA))으로 상술의 다른 전압(logDCD)을 뺄셈하는 방식으로 입력신호들(logDCD, log (1/2 × DCA))의 차이값(logDCD- log(1/2 × DCA))을 산출하여 역대수증폭기(20)로 출력한다.The logarithm amplifiers 17 and 18 output a voltage value obtained by taking a logarithm of an input signal, and the first logarithm amplifier 17 takes a logarithm to an input voltage difference value DC D. outputs logDC D , and the second logarithm amplifier 18 obtains the logarithm of the input voltage addition value (1/2 × DC A ) and another predetermined voltage value (log (1/2 × DC A )). Outputs The comparator 19 connected to the output terminals of the logarithmic amplifiers 17 and 18 is a method of subtracting the above-described other voltage logDC D from the voltage value log (1/2 × DC A ), which is a reference of the comparison. The difference value (logDC D -log (1/2 × DC A )) of the input signals logDC D and log (1/2 × DC A ) is calculated and output to the inverse logarithm amplifier 20.
역대수증폭기(20)는 비교기(19)로부터 출력하는 전압차이값에 지수(exponent, 또는 역대수)를 취하여 얻어진 신호(DCdef)를 출력한다.The inverse logarithm amplifier 20 outputs a signal DC def obtained by taking an exponent or an inverse logarithm to the voltage difference value output from the comparator 19.
제2연산증폭기(21)는 입력신호(DCdef.)의 전압값이 충분히 크게되도록 입력신호(DCdef)를 증폭한 다음, 증폭된 신호를 A/D변환기(22)로 공급한다.The supply to the second operational amplifier 21 is the input signal, and then, A / D converter 22, the amplified signal amplifying an input signal (DC def) so that voltage is sufficiently large in the (DC def.).
A/D변환기(22)는 제2연산증폭기(21)로부터 입력하는 아날로그전압을 8비트의 디지털 데이타를 생성하는 것으로서, 입력된 아날로그전압을 디지털 데이타로 변환하여 출력한다. A/D변환기(22)의 출력단에 연결된 디지털 표시기(23)는 액정소자를 이용하여 구성한 것으로서, 입력하는 8비트의 디지털 데이타를 신호처리하여 트랙중심에 대한 광픽업의 편심(deflection)을 퍼센테이지 단위로 표시한다.The A / D converter 22 generates 8-bit digital data from the analog voltage input from the second operational amplifier 21. The A / D converter 22 converts the input analog voltage into digital data and outputs the digital data. The digital display 23 connected to the output terminal of the A / D converter 22 is configured by using a liquid crystal element, and processes the input 8-bit digital data to signal the deflection of optical pickup with respect to the center of the track. To be displayed.
상술한 바와 같이, 본 고안에 따른 트랙중심에 대한 광픽업의 편심검출장치는 저렴한 가격으로 광디스크에 대한 광픽업의 편심정도를 검출 및 표시할 수 있는 효과를 가져온다.As described above, the eccentric detection apparatus of the optical pickup for the track center according to the present invention has the effect of detecting and displaying the eccentricity of the optical pickup for the optical disk at a low price.
Claims (6)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR92018688U KR0119713Y1 (en) | 1992-09-30 | 1992-09-30 | Deflection detecting device of optical pick-up |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR92018688U KR0119713Y1 (en) | 1992-09-30 | 1992-09-30 | Deflection detecting device of optical pick-up |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR940008466U KR940008466U (en) | 1994-04-18 |
| KR0119713Y1 true KR0119713Y1 (en) | 1998-08-01 |
Family
ID=19340981
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR92018688U KR0119713Y1 (en) | 1992-09-30 | 1992-09-30 | Deflection detecting device of optical pick-up |
Country Status (1)
| Country | Link |
|---|---|
| KR (1) | KR0119713Y1 (en) |
-
1992
- 1992-09-30 KR KR92018688U patent/KR0119713Y1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| KR940008466U (en) | 1994-04-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR890005683A (en) | Optical Disc Device | |
| JP2724996B2 (en) | Relative position detection device | |
| JP2602613B2 (en) | Laser power control system for optical equipment | |
| KR0119713Y1 (en) | Deflection detecting device of optical pick-up | |
| US7023767B2 (en) | Gain calibration device and method for differential push-pull tracking error signals | |
| EP0233590A1 (en) | Method and apparatus for detecting focussing position | |
| JPH0443808Y2 (en) | ||
| KR0165598B1 (en) | Tracking servo control device of optic disk reproducing system | |
| JPS61158042A (en) | Tracking controlling circuit | |
| JPS5917527A (en) | Bias controller of optical modulator | |
| JPH0570965B2 (en) | ||
| KR0165597B1 (en) | Disk tilt detection device of optic disk reproducing system | |
| KR100246772B1 (en) | Device for driving laser | |
| JPS63286715A (en) | Automatic output controller for optical sensor | |
| KR950005251B1 (en) | Mirror circuit of cdp | |
| JP3104332B2 (en) | Optical applied current / voltage sensor | |
| JPS5924394B2 (en) | Even order strain detection device | |
| KR0141848B1 (en) | Apparatus of evaluating mini disc | |
| KR890005282B1 (en) | Raser pick-up receiving measuring circuit | |
| JPH09218098A (en) | Automatic extinction ratio measuring equipment | |
| JP2748363B2 (en) | Loop gain control device | |
| KR900006955B1 (en) | Apparatus for reducing distortion by tracking servo disturbance in optical disc player | |
| JP2875618B2 (en) | Mirror detection circuit of optical disk player | |
| KR100268491B1 (en) | Apparatus for sensing defect of disc | |
| JPH0572029A (en) | Optical powermeter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A201 | Request for examination | ||
| E902 | Notification of reason for refusal | ||
| E701 | Decision to grant or registration of patent right | ||
| REGI | Registration of establishment | ||
| FPAY | Annual fee payment |
Payment date: 20050202 Year of fee payment: 8 |
|
| LAPS | Lapse due to unpaid annual fee |