JPS6130327B2 - - Google Patents
Info
- Publication number
- JPS6130327B2 JPS6130327B2 JP56031790A JP3179081A JPS6130327B2 JP S6130327 B2 JPS6130327 B2 JP S6130327B2 JP 56031790 A JP56031790 A JP 56031790A JP 3179081 A JP3179081 A JP 3179081A JP S6130327 B2 JPS6130327 B2 JP S6130327B2
- Authority
- JP
- Japan
- Prior art keywords
- voice coil
- actuator
- light irradiation
- irradiation system
- circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
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
-
- 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
- G11B7/0925—Electromechanical actuators for lens positioning
- G11B7/093—Electromechanical actuators for lens positioning for focusing and tracking
-
- 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
- G11B7/0925—Electromechanical actuators for lens positioning
- G11B7/0932—Details of sprung supports
Landscapes
- Optical Recording Or Reproduction (AREA)
- Automatic Focus Adjustment (AREA)
Description
【発明の詳細な説明】
本発明は、情報記録媒体に記録された情報を光
学的に再生する装置に関し、特に光学式ビデオ・
オーデイオデイスク装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for optically reproducing information recorded on an information recording medium, and in particular to an apparatus for optically reproducing information recorded on an information recording medium.
This invention relates to an audio disc device.
光学式ビデオデイスクは、透明材質よりなる円
形デイスク面上の情報トラツクに渦巻き状にピツ
ト列が形成されており、これらのピツトの長さと
間隔によりビデオ情報が記録されている。このデ
イスクからの情報の読取は、レーザー光をレンズ
で収束した高輝度の微小ビームを回転しているデ
イスク面上に照射し、ピツトの有無に応じて変調
される反射光の光量変化を復調することによつて
行なわれる。情報読取のために光学式ビデオデイ
スクを高速で回転させると、デイスクの波打ちや
回転軸の振れによつて、デイスクの上下変動と情
報トラツクの横方向の位置変動が起こる。このた
め、正確に情報を読み出すためには、ピツクアツ
プ全体又は一部をデイスク記録面の上下横方向の
変動に追従して変動させ、常に光束を記録面の情
報ピツト上に収束させておくことが必要となる。
従つて、ビデオデイスクの記録情報を検出するピ
ツクアツプ装置に於いては、ピツクアツプを上下
横方向に駆動するためのフオーカスサーボ装置と
トラツクサーボ装置が付設されている。これらサ
ーボ装置は、情報ピツトから上下横方向のずれを
検出する誤差検出部と、誤差検出部の検出信号を
増幅し位相を進ませる電子回路及びピツクアツプ
の一部または全部を駆動し、情報ピツトからのず
れを補正するアクチユエーターより成つている。
通常、アクチユエーターは、導電線のコイルとこ
のコイルを横切る磁力線を発生する磁気回路とピ
ツクアツプの駆動部分を固定部分から支える弾性
支持体より構成される。 In an optical video disk, pit rows are formed in a spiral manner on an information track on a circular disk surface made of a transparent material, and video information is recorded based on the length and spacing of these pits. To read information from this disk, a high-intensity minute beam of laser light focused by a lens is irradiated onto the rotating disk surface, and the changes in the amount of reflected light that are modulated depending on the presence or absence of pits are demodulated. It is done by When an optical video disk is rotated at high speed to read information, waving of the disk and wobbling of the rotating shaft cause vertical movement of the disk and horizontal positional movement of the information track. Therefore, in order to read information accurately, it is necessary to move the entire pickup or a portion of it to follow the vertical and horizontal fluctuations of the disk recording surface, and to always keep the light beam focused on the information pit on the recording surface. It becomes necessary.
Therefore, a pickup device for detecting recorded information on a video disk is provided with a focus servo device and a track servo device for driving the pickup in the vertical and lateral directions. These servo devices drive part or all of an error detection section that detects vertical and horizontal deviations from the information pit, an electronic circuit that amplifies the detection signal of the error detection section and advances the phase, and a pickup. It consists of an actuator that corrects the misalignment.
Usually, an actuator consists of a coil of conductive wire, a magnetic circuit that generates lines of magnetic force that cross the coil, and an elastic support that supports the driving part of the pickup from a fixed part.
アクチユエーターの構成の一例を第１図に示
す。 An example of the structure of the actuator is shown in FIG.
駆動部弾性支持体１で支承され、駆動用ボイス
コイルの磁気回路２によつて駆動エネルギーが付
与されるピツクアツプ駆動部３と、このピツクア
ツプ駆動部３に連結され、上記磁気回路２との磁
気作用によりピツクアツプ駆動部３を移動せしめ
る駆動用ボイスコイル４とによりアクチユエータ
ーが構成される。駆動用ボイスコイル４はピツク
アツプ駆動部３をフオーカスサーボ、トラツクサ
ーボの補正方向に回転軸を有する。このアクチユ
エーターに於ける駆動部質量をｍ、磁気回路ギヤ
ツプ磁束をB1、コイルターン数をN1、コイル口
径をD1、コイル抵抗をr1、ばね定数をKs、ダン
ピング係数をKdとし、また、コイルへの印加電
圧をV1、コイル電流をI1、平衡点からのピツクア
ツプ駆動部３の変位をＸとすると、
L1ｄＩ１／ｄｔ＋r1I1＝V1−πB1N1D1ｄＸ／ｄｔ……
…(1)
なる関係式が成立する。 A pickup drive unit 3 supported by a drive unit elastic support 1 and to which drive energy is applied by a magnetic circuit 2 of a drive voice coil, and a pickup drive unit 3 connected to this pickup drive unit 3 to have a magnetic effect with the magnetic circuit 2. An actuator is constituted by the driving voice coil 4 which moves the pickup driving section 3. The driving voice coil 4 has a rotation axis in the direction of correcting the pickup driving section 3 for focus servo and track servo. In this actuator, the driving part mass is m, the magnetic circuit gap magnetic flux is B 1 , the number of coil turns is N 1 , the coil diameter is D 1 , the coil resistance is r 1 , the spring constant is Ks, and the damping coefficient is Kd. , and if the voltage applied to the coil is V 1 , the coil current is I 1 , and the displacement of the pickup drive unit 3 from the equilibrium point is X, then L 1 dI 1 /dt+r 1 I 1 = V 1 −πB 1 N 1 D 1 dX/dt...
…(1) The following relational expression holds true.
またピツクアツプ駆動部３の運動方程式より
ｍｄ２Ｘ／ｄｔ２＝πB1N1D1I1−KsX−KdｄＸ／ｄｔ
………(2)
となる。 Also, from the equation of motion of the pickup drive unit 3, md 2 X/dt 2 = πB 1 N 1 D 1 I 1 −KsX−KddX/dt
......(2) becomes.
(1)式及び(2)式をラプラス変換すると、 I1（ｓ）（L1S＋r1）＝V1（ｓ）−πB1N1D1SX（ｓ） ………(3) Ｘ（ｓ）（mS2＋KdS＋Ks）＝πB1N1D1I1（ｓ） ………(4) ここでＳはラプラス変数となる。 When formulas (1) and (2) are Laplace transformed, I 1 (s) (L 1 S + r 1 ) = V 1 (s) - πB 1 N 1 D 1 SX (s) ...... (3) s) (mS 2 +KdS+Ks)=πB 1 N 1 D 1 I 1 (s) (4) Here, S is a Laplace variable.
(3)、(4)式から電圧に対する変位の伝達関数を求
めると、
Ｇ＝Ｘ（ｓ）／Ｖ（ｓ）＝ｂ０／ａ３Ｓ３＋ａ２Ｓ２
＋ａ１Ｓ＋ａ０………(5)
b0＝πB1N1D1
a3＝L1m
a2＝r1m＋L1Kd
a1＝r1Kd＋L1＋Ks＋（πB1N1D1）2
a0＝Ksr1
となる。 When the transfer function of displacement to voltage is determined from equations (3) and (4), G=X(s)/V(s)=b 0 /a 3 S 3 +a 2 S 2
+a 1 S+a 0 ......(5) b 0 = πB 1 N 1 D 1 a 3 = L 1 m a 2 = r 1 m + L 1 Kd a 1 = r 1 Kd + L 1 + Ks + (πB 1 N 1 D 1 ) 2 a 0 = Ksr 1 .
以上よりアクチユエーターが満足すべき条件と
しては次の３点が挙げられる。 From the above, the following three conditions can be listed as conditions that the actuator must satisfy.
〔1〕 伝達関数の位相遅れ量が制御すべき周波数
範囲において充分小さく、安定に負帰還制御が
可能であること。[1] The phase delay amount of the transfer function is sufficiently small in the frequency range to be controlled, and stable negative feedback control is possible.
〔2〕 アクチユエーターのダンピング係数が充分
大きくて、過渡応答に対し安定であること。[2] The damping coefficient of the actuator must be sufficiently large and stable against transient responses.
〔3〕 弾性支持体のばね定数が適当であること。[3] The spring constant of the elastic support is appropriate.
以上の３つの条件は(5)式の伝達関数がＧ（Ｓ）
のb0、a3、a2、a1、a0のパラメーターによつて決
定される。 The above three conditions mean that the transfer function of equation (5) is G(S)
It is determined by the parameters of b 0 , a 3 , a 2 , a 1 , and a 0 .
Ｇ（ｓ）の位相遅れ量は
Ｓ＝jw
ここで、ｊは純虚数
ｗは印加電圧周波数
とおいて、
∠Ｇ＝−arctan（ａ１ｗ−ａ３ｗ３／ａ０−ａ２ｗ２
）………(6)
となる。位相遅れが90゜、180゜となる周波数は
∠Ｇ＝90゜、ｗ＝√0 2、
∠Ｇ＝180゜、ｗ＝√1 3
また、ｗが充分大きいときは
∠Ｇ＝−arctan（ａ３／ａ２ｗ）
となる。 The phase delay amount of G(s) is S=jw, where j is a purely imaginary number and w is the applied voltage frequency, ∠G=-arctan(a 1 w-a 3 w 3 /a 0 -a 2 w 2
)......(6). The frequencies at which the phase lag is 90° and 180° are ∠G=90°, w=√ 0 2 , ∠G=180°, w=√ 1 3 , and when w is large enough, ∠G=−arctan(a 3 /a 2 w).
負帰還制御すべき周波数において、位相遅れを
小さくする条件を満足させるためには、結局a0、
a1、a2を大きくすればよいことがわかる。またダ
ンピングを大きくするためにはダンピング係数を
大きくすればよいことから、結局a1を大きくすれ
ばよい。バネ定数を適当に選定することはa0を適
当に選定することと同等である。 In order to satisfy the condition of reducing the phase delay at the frequency to be controlled by negative feedback, a 0 ,
It can be seen that it is necessary to increase a 1 and a 2 . Furthermore, in order to increase the damping, it is sufficient to increase the damping coefficient, so in the end, it is sufficient to increase a 1 . Appropriately selecting the spring constant is equivalent to appropriately selecting a 0 .
ところで、b0、a3、a2、a1、a0の各パラメータ
ーはアクチユエーターの駆動部分の質量、ボイス
コイルや磁気回路の形状が与えられるとほぼ決定
される。このため、上述の〔１〕乃至〔３〕の各
条件を満足するようにパラメーターを任意に選定
することは一般的に困難であり、アクチユエータ
ーとして満足すべき特性を得るものを設計するこ
とは容易ではない。 By the way, each parameter of b 0 , a 3 , a 2 , a 1 , and a 0 is approximately determined based on the mass of the driving part of the actuator and the shape of the voice coil and magnetic circuit. For this reason, it is generally difficult to arbitrarily select parameters to satisfy each of the conditions [1] to [3] above, and it is difficult to design an actuator that has satisfactory characteristics. is not easy.
本発明は上述の困難な問題点を克服することの
できる新規な技術を駆使したピツクアツプ装置を
提供することを目的とするものである。 SUMMARY OF THE INVENTION An object of the present invention is to provide a pickup device that makes full use of novel technology that can overcome the above-mentioned difficult problems.
以下本発明を実施例に従つて図面を参照しなが
ら詳説する。 Hereinafter, the present invention will be explained in detail according to embodiments with reference to the drawings.
第２図は本発明の１実施例を示すピツクアツプ
装置の要部構成図である。 FIG. 2 is a block diagram of the main parts of a pickup device showing one embodiment of the present invention.
第１図同様、弾性支持体１で支承され、磁気回
路２によつて制御駆動されるピツクアツプ駆動部
３と、このピツクアツプ駆動部３に連結され、磁
気回路２との磁気作用により駆動エネルギーを形
成する駆動用ボイスコイル４を有し、更に駆動用
ボイスコイル４以外にピツクアツプ駆動部３の運
動量に比例した電圧を得て、これを駆動回路に帰
還させるために、ピツクアツプ駆動部３の変動を
検出する変動検出用磁気回路５及び変動検出用ボ
イスコイル６が設けられている。ここで変動検出
用磁気回路５のギヤツプ磁束をB2、変動検出用
ボイスコイル６のターン数をN2、口径をD2、抵
抗をr2で表わす。変動検出用の磁気回路５及びボ
イスコイル６を有するアクチユエーターの駆動系
回路構成の１実施例を第３図に示す。 Similarly to FIG. 1, there is a pick-up drive unit 3 supported by an elastic support 1 and controlled and driven by a magnetic circuit 2, which is connected to the pick-up drive unit 3 and generates drive energy through magnetic action with the magnetic circuit 2. Furthermore, in addition to the driving voice coil 4, a voltage proportional to the momentum of the pickup drive section 3 is obtained, and in order to feed this back to the drive circuit, fluctuations in the pickup drive section 3 are detected. A variation detection magnetic circuit 5 and a variation detection voice coil 6 are provided. Here, the gap magnetic flux of the fluctuation detection magnetic circuit 5 is represented by B 2 , the number of turns of the fluctuation detection voice coil 6 is represented by N 2 , the aperture is represented by D 2 , and the resistance is represented by r 2 . FIG. 3 shows an embodiment of an actuator drive system circuit configuration having a magnetic circuit 5 for detecting fluctuations and a voice coil 6.
ピツクアツプ装置のレーザ照射系に連結された
ピツクアツプ駆動部３の磁芯部に巻回された駆動
用ボイスコイル４に隣設して変動検出用ボイスコ
イル６が上記磁芯部に巻回されている。磁芯部が
芯長方向へ移動することによりフオーカスサー
ボ、トラツクサーボ等の位置ずれ補正が行なわれ
る。変動検出用ボイスコイル６の一端は接地さ
れ、他端は変動検出用ボイスコイル６の出力電圧
に対する微分増幅回路７、比例増幅回路８、積分
増幅回路９に並列接続されている。微分増幅回路
７、比例増幅回路８及び積分増幅回路９からの出
力は加算回路１０へ入力され、加算回路１０は上
記駆動用ボイスコイル４の一端と接続されてい
る。従つて変動検出用ボイスコイル６に誘導され
た電圧を微分増幅、比例増幅及び積分増幅して駆
動用ボイスコイル４に帰還させることができる。 Adjacent to the driving voice coil 4 wound around the magnetic core of the pickup drive unit 3 connected to the laser irradiation system of the pickup device, a fluctuation detection voice coil 6 is wound around the magnetic core. . By moving the magnetic core in the core length direction, positional deviation correction of focus servo, track servo, etc. is performed. One end of the fluctuation detection voice coil 6 is grounded, and the other end is connected in parallel to a differential amplifier circuit 7, a proportional amplifier circuit 8, and an integral amplifier circuit 9 for the output voltage of the fluctuation detection voice coil 6. Outputs from the differential amplifier circuit 7, the proportional amplifier circuit 8, and the integral amplifier circuit 9 are input to an adder circuit 10, and the adder circuit 10 is connected to one end of the driving voice coil 4. Therefore, the voltage induced in the fluctuation detecting voice coil 6 can be differentially amplified, proportionally amplified, and integrally amplified and fed back to the driving voice coil 4.
第３図に於ける回路構成の印加電圧対電流の関
係は
L1ｄＩ１／ｄｔ＋r1I1＝V1−πB1N1D1ｄＸ／ｄｔ−Ｕ（πB2N2D2）ｄ２Ｘ／ｄｔ２−Ｖ（πB2N2D2）ｄＸ／ｄｔ
−ｗ（πB2N2D2）Ｘ ………(8)
ここで、Ｕ、Ｖ、Ｗはそれぞれ微分、比例、積
分の増幅率を表わす。 The relationship between applied voltage and current for the circuit configuration in Figure 3 is L 1 dI 1 /dt+r 1 I 1 =V 1 -πB 1 N 1 D 1 dX/dt-U(πB 2 N 2 D 2 ) d 2 X/dt 2 -V(πB 2 N 2 D 2 )dX/dt -w(πB 2 N 2 D 2 )X (8) Here, U, V, and W are differential, proportional, and integral values, respectively. Represents the amplification factor.
で表わされる。It is expressed as
(2)式と(8)式から(5)式と同様にして伝送関数を求
めると、
Ｇ（ｓ）＝Ｘ（ｓ）／Ｖ（ｓ）＝ｂ０／ａ３Ｓ３＋（ａ２＋ｃ２）Ｓ２＋（ａ１＋ｃ１）Ｓ＋ａ０＋Ｃ０………(7
)
C2＝b0U（πB2N2D2）
C1＝b0V（πB2N2D2）
C0＝b0W（πB2N2D2）
となる。 If we calculate the transmission function from equations (2) and (8) in the same way as equation (5), we get G(s)=X(s)/V(s)=b 0 /a 3 S 3 +(a 2 +c 2 )S 2 +(a 1 +c 1 )S+a 0 +C 0 ......(7
) C 2 = b 0 U (πB 2 N 2 D 2 ) C 1 = b 0 V (πB 2 N 2 D 2 ) C 0 = b 0 W (πB 2 N 2 D 2 ).
新たに与えられた(7)式の伝達関数に於いて、Ｓ
の各々の指数の係数は
a3′＝a3
a2′＝a2＋C2
a1′＝a1＋C1
a0′＝a0＋C0
となる。 In the newly given transfer function of equation (7), S
The coefficient of each index is a 3 ′=a 3 a 2 ′=a 2 +C 2 a 1 ′=a 1 +C 1 a 0 ′=a 0 +C 0 .
第３図から明らかなように、C2，C1，C0の絶
対値及び正負の符号は電子回路の定数を変えるこ
とにより任意に設定することができる。このこと
により(8)式で与えられる各係数の値は、アクチユ
エーターの形状にかかわらず任意に決定すること
ができ、上述の〔１〕乃至〔３〕の各条件を満足
するアクチユエーターを得ることができる。 As is clear from FIG. 3, the absolute values and positive/negative signs of C 2 , C 1 , and C 0 can be arbitrarily set by changing the constants of the electronic circuit. As a result, the value of each coefficient given by equation (8) can be arbitrarily determined regardless of the shape of the actuator, and an actuator that satisfies each of the conditions [1] to [3] above can be used. can be obtained.
上記アクチユエーターをピツクアツプの駆動手
段として利用し、デイスク面上へ照射するレーザ
の情報ピツト位置からの上下横方向のずれを検知
してフオーカスサーボ及びトラツクサーボを行な
うことによりデイスクの記録情報を正確に読み取
ることができるフオーカスサーボ機構及びトラツ
クサーボ機構を得ることができる。 The above actuator is used as a pick-up drive means, and the recorded information on the disk is detected by detecting vertical and horizontal deviations from the information pit position of the laser irradiated onto the disk surface and performing focus servo and track servo. A focus servo mechanism and a track servo mechanism that can read accurately can be obtained.
以上詳説した如く本発明はピツクアツプ駆動部
の変動を電気信号として検出することにより、ア
クチユエーターの周波数特性を容易に改善設計す
ることができ、安定なサーボ系を構成することが
できる。更に、ボイスコイルに隣接して設けた変
動検出用ボイスコイルで光照射系の移動量を検知
する検知手段によつて得られた信号を微分増幅、
比例増幅及び積分増幅したものを加算して、駆動
用ボイスコイルに帰還させアクチユエーターの動
作を制御することによつて、伝送関数の特性を大
幅に向上させることができる。 As described in detail above, the present invention detects fluctuations in the pickup drive section as electrical signals, thereby making it possible to easily improve the frequency characteristics of the actuator and construct a stable servo system. Furthermore, the signal obtained by the detection means for detecting the amount of movement of the light irradiation system is differentially amplified using a voice coil for detecting fluctuations provided adjacent to the voice coil.
By adding the proportional amplification and integral amplification and feeding it back to the driving voice coil to control the operation of the actuator, the characteristics of the transfer function can be greatly improved.
第１図は従来のピツクアツプ装置に於けるアク
チユエーターの構成図である。第２図は本発明の
１実施例を示すピツクアツプ装置に於けるアクチ
ユエーターの構成図である。第３図は第２図に示
すアクチユエーターの回路構成図である。
１……弾性支持体、２……磁気回路、３……ピ
ツクアツプ駆動部、４……駆動用ボイスコイル、
５……変動検出用磁気回路、６……変動検出用ボ
イスコイル、７……微分増幅部、８……比例増幅
部、９……積分増幅部、１０……加算回路。
FIG. 1 is a block diagram of an actuator in a conventional pickup device. FIG. 2 is a configuration diagram of an actuator in a pickup device showing one embodiment of the present invention. FIG. 3 is a circuit diagram of the actuator shown in FIG. 2. DESCRIPTION OF SYMBOLS 1... Elastic support body, 2... Magnetic circuit, 3... Pickup drive section, 4... Driving voice coil,
5... Magnetic circuit for variation detection, 6... Voice coil for variation detection, 7... Differential amplification section, 8... Proportional amplification section, 9... Integral amplification section, 10... Addition circuit.
Claims (1)
を介して光学的に再生するピツクアツプ装置に於
いて、 前記光照射系と前記記録媒体の記録位置との間
のずれを補正する方向へ前記光照射系を駆動する
アクチユエーターの駆動回路を、磁気回路と前記
光照射系に磁気駆動力を付与する駆動用ボイスコ
イルで構成し、 前記ボイスコイルに隣接して設けた変動検出用
ボイスコイルで前記光照射系の移動量を検知する
検知手段と、該検知手段によつて得られた信号を
微分増幅、比例増幅及び積分増幅したものを加算
して、前記駆動用ボイスコイルに帰還させ前記ア
クチユエーターの動作を制御する制御回路とを具
備したことを特徴とするピツクアツプ装置。[Scope of Claims] 1. In a pickup device that optically reproduces information from a recording medium on which information is recorded via a light irradiation system, a deviation between the light irradiation system and the recording position of the recording medium A drive circuit for an actuator that drives the light irradiation system in a direction that corrects the light irradiation system is composed of a magnetic circuit and a drive voice coil that applies a magnetic driving force to the light irradiation system, and is provided adjacent to the voice coil. a detection means for detecting the amount of movement of the light irradiation system using a fluctuation detection voice coil; A pickup device comprising: a control circuit that controls the operation of the actuator by feeding feedback to the voice coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3179081A JPS57147142A (en) | 1981-03-04 | 1981-03-04 | Pickup device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3179081A JPS57147142A (en) | 1981-03-04 | 1981-03-04 | Pickup device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57147142A JPS57147142A (en) | 1982-09-10 |
| JPS6130327B2 true JPS6130327B2 (en) | 1986-07-12 |
Family
ID=12340854
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3179081A Granted JPS57147142A (en) | 1981-03-04 | 1981-03-04 | Pickup device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57147142A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0833054B2 (en) * | 1989-03-30 | 1996-03-29 | 株式会社平井技研 | Roofing equipment |
| JP2742715B2 (en) * | 1989-10-17 | 1998-04-22 | 株式会社小野測器 | Calibration method of optical pickup for mechanical property evaluation |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5161724A (en) * | 1974-11-27 | 1976-05-28 | Nippon Musical Instruments Mfg |
-
1981
- 1981-03-04 JP JP3179081A patent/JPS57147142A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57147142A (en) | 1982-09-10 |
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