JPS60211642A - Optical head - Google Patents
Optical headInfo
- Publication number
- JPS60211642A JPS60211642A JP6665384A JP6665384A JPS60211642A JP S60211642 A JPS60211642 A JP S60211642A JP 6665384 A JP6665384 A JP 6665384A JP 6665384 A JP6665384 A JP 6665384A JP S60211642 A JPS60211642 A JP S60211642A
- Authority
- JP
- Japan
- Prior art keywords
- elastic body
- piezoelectric ceramic
- optical head
- laminated piezoelectric
- fixed
- 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.)
- Pending
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 24
- 239000000919 ceramic Substances 0.000 claims abstract description 24
- 230000005611 electricity Effects 0.000 abstract 3
- 230000001678 irradiating effect Effects 0.000 abstract 3
- 239000000463 material Substances 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- RGJOEKWQDUBAIZ-IBOSZNHHSA-N CoASH Chemical compound O[C@@H]1[C@H](OP(O)(O)=O)[C@@H](COP(O)(=O)OP(O)(=O)OCC(C)(C)[C@@H](O)C(=O)NCCC(=O)NCCS)O[C@H]1N1C2=NC=NC(N)=C2N=C1 RGJOEKWQDUBAIZ-IBOSZNHHSA-N 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 230000010287 polarization Effects 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
-
- 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
- G11B7/0937—Piezoelectric actuators
Landscapes
- Optical Recording Or Reproduction (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の属する技術分野〕
本発明は光スポットにより記録情報を検出する光学ヘッ
ドに関する。DETAILED DESCRIPTION OF THE INVENTION [Technical field to which the invention pertains] The present invention relates to an optical head that detects recorded information using a light spot.
この種の光学ヘッドにおいては、情報を正しく再生する
ために、トラックに直角な方向とフォーカス方向への追
従位置決めが正確になされなければならない。従来、ト
ラックに直角な方向とフォーカス方向への追従位置決め
は、電磁駆動方式とするのが一般的である。In order to correctly reproduce information, this type of optical head must be accurately positioned in the direction perpendicular to the track and in the focus direction. Conventionally, follow-up positioning in the direction perpendicular to the track and in the focus direction is generally performed using an electromagnetic drive method.
従来の電磁駆動方式による光学ヘッドの駆動機構を第１
図に示す。The first optical head drive mechanism uses the conventional electromagnetic drive method.
As shown in the figure.
２個の環状ヨーク１０１と環状磁石１０２とで構成され
た外磁型あるいは内磁型のフォーカス方向位置決め用磁
気回路内にコイルを巻いたボビン１０３が挿入されてい
る。ボビン１０３はその上端が２枚のフォーカス方向板
バネ１０４に接合され、他端はケース等に固定されてい
る。ボビン１０３上には全反射プリズム１０５が配置し
てあり２発光源からのコリメート光１０６を対物レンズ
】０８方向に反射している。支持枠１０７に保持された
対物レンズ１０８はコリメート光１０６を絞り、光スポ
ラ）１０９を形成している。ボビン１０３のコイツノに
電流を流すと注入電流に応じた電磁駆動力が発生し、フ
ォーカス方向板バネ１０４の反発力と平衡し合う位置に
フォーカス方向の位置決めがなされる。A bobbin 103 having a coil wound thereon is inserted into an outer magnet type or inner magnet type magnetic circuit for positioning in the focus direction, which is composed of two annular yokes 101 and an annular magnet 102 . The upper end of the bobbin 103 is joined to two focus direction leaf springs 104, and the other end is fixed to a case or the like. A total reflection prism 105 is arranged on the bobbin 103, and reflects collimated light 106 from the two light emitting sources in the direction of the objective lens. An objective lens 108 held by a support frame 107 focuses the collimated light 106 to form an optical spora 109. When a current is passed through this part of the bobbin 103, an electromagnetic driving force corresponding to the injected current is generated, and positioning in the focus direction is performed at a position balanced with the repulsive force of the focus direction plate spring 104.
一方、支持枠１０７に隣接してヨーク１０１′と磁石１
０２′とで構成されたトラックに直角な方向の位置決め
用磁気回路が配置されている。支持枠１０７にはコイル
を巻いたボビン１１−′１と２枚の板バネ１１０とが接
合しており、ボビン１１１のコイルに電、流を流すと電
磁駆動力が発生して板バネ１１０の反発力と平衡し合う
位置にトラックと直角な方向の位置決めがなされる。On the other hand, adjacent to the support frame 107, a yoke 101' and a magnet 1
A magnetic circuit for positioning in a direction perpendicular to the track constituted by 02' is arranged. A bobbin 11-'1 having a coil wound thereon and two leaf springs 110 are connected to the support frame 107. When an electric current is passed through the coil of the bobbin 111, an electromagnetic driving force is generated and the leaf springs 110 are moved. Positioning in the direction perpendicular to the track is performed at a position that balances the repulsive force.
ところで、このような従来の光学ヘッドは、第１に構成
が複雑になる欠点がある。すなわち、磁気回路を高効率
にするためにはボビン挿入部の間隔を極力小さくする必
要がある。それ故、ボビンとの接触を防ぐために、ボビ
ン及びヨークの加工精度を上げ１組立て時にも十分な注
意をしなければなら々い。また、板バネ１１０とフォー
カス方向板バネ１０４は、光学ヘッドが少なくとも数ｋ
Ｈｚ以上の追従を可能にするために、構造、材料等にか
らむ共振を極力除去する構成方式及び作製方法としなけ
ればならない。この問題は光学ヘッド構成上非常に重要
であるが、未解決に近いというのが現状である。By the way, such a conventional optical head has the first drawback that the structure is complicated. That is, in order to make the magnetic circuit highly efficient, it is necessary to make the interval between the bobbin insertion parts as small as possible. Therefore, in order to prevent contact with the bobbin, it is necessary to increase the machining accuracy of the bobbin and yoke and to take sufficient care during assembly. Further, the leaf spring 110 and the focus direction leaf spring 104 are such that the optical head is
In order to enable tracking at Hz or higher, a configuration and manufacturing method must be used that eliminates resonances caused by the structure, materials, etc. as much as possible. Although this problem is very important in terms of the structure of the optical head, it is currently almost unsolved.
第２に電気変換効率が低い欠点がある。すなわち、電磁
駆動方式はコイルに流す電流に比例した駆動力が発生す
ることから、対物レンズ１０８等の付加質量がたとえ数
グラム以下と小さくても。The second drawback is that the electrical conversion efficiency is low. That is, since the electromagnetic drive method generates a driving force proportional to the current flowing through the coil, even if the additional mass of the objective lens 108 and the like is as small as several grams or less.
コイルには数１００ｍＡの電流を流さなければならない
。コイルは、一般に数Ωの内部抵抗を有することから、
ジーール熱となって効率を低下させてしまう。現状では
１５係程度と低い。A current of several 100 mA must be passed through the coil. Since the coil generally has an internal resistance of several Ω,
It becomes Zeel heat and reduces efficiency. Currently, the number is low at around 15.
第３に高価になる欠点がある。すなわち、構成が複雑で
あることから組立て時の工数が非常に多くかかったり、
各部制の選定あるいは作製に多大な労力を要する。Thirdly, it has the disadvantage of being expensive. In other words, because the configuration is complex, it takes a lot of man-hours to assemble it,
It takes a lot of effort to select or create each division system.
第４に信頼性を低下させる欠点がある。すなわち、電磁
駆動方式では発熱等の問題が生じることから電流を大き
くすることができず、駆動力が小さくなり、剛性の太き
々板バネ材を使用できない。Fourth, there is a drawback of lowering reliability. That is, in the electromagnetic drive method, problems such as heat generation occur, so the current cannot be increased, the driving force becomes small, and a rigid and thick leaf spring material cannot be used.
それ故、剛性の小さな板バネ材としたり、構成を精細に
することが必要と々る。従って、ディスクの回転時の振
動の影響を受けたり、移動時の取扱いによる変形あるい
は作製時の変形等の影・婬を受け信頼性を低下させてし
まう。Therefore, it is necessary to use a leaf spring material with low rigidity or to make the structure more precise. Therefore, reliability is degraded due to the effects of vibrations during rotation of the disk, deformation due to handling during transportation, deformation during manufacturing, and the like.
このように従来の光学ヘッドは、構成が複雑。As you can see, conventional optical heads have complicated structures.
電気変換効率が低い、高価になる。信頼性が低いという
欠点がある。Electrical conversion efficiency is low and expensive. It has the disadvantage of low reliability.
従って１本発明の目的は、簡単な構成、高効率。 Therefore, one object of the present invention is to have a simple configuration and high efficiency.
低価格、信頼性の高い光学ヘッドを提供することにある
。Our goal is to provide low-cost, highly reliable optical heads.
本発明によれば、前記光スポットを形成する対物レンズ
を含む照射手段の位置を、トラックに直角な方向へ追従
して制御するトラック制御系と光軸方向へ追従して制御
するフォーカス制御系とを備え。According to the present invention, there is provided a track control system that controls the position of the irradiation means including the objective lens that forms the light spot by following it in a direction perpendicular to the track, and a focus control system that controls the position of the irradiation means that follows it in the direction of the optical axis. Equipped with.
前記トラック制御系は一端を前記照射手段に固定し他端
を固定支持体に固定した第１の弾性体と。The track control system includes a first elastic body having one end fixed to the irradiation means and the other end fixed to a fixed support.
一端を前記固定支持体に固定し他端をＡｉｌ記第１の弾
性体の所定位置に連結した第１の積層圧電セラミックと
で構成し、前記フォーカス制御系は一端を前記固定支持
体に固定し他端を前記照射手段に関して前記第１の弾性
体と直交するように前記照射手段に固定した第２の弾性
体と、一端を前記固定支持体に固定し他端を前記第２の
弾性体の所定位置に連結した第２の積層圧電セラミック
とで構成したことを特徴とする光学ヘッドが得られる。a first laminated piezoelectric ceramic having one end fixed to the fixed support and the other end connected to a predetermined position of the first elastic body, and the focus control system has one end fixed to the fixed support. a second elastic body whose other end is fixed to the irradiation means so as to be orthogonal to the first elastic body with respect to the irradiation means; An optical head characterized in that it is constituted by a second laminated piezoelectric ceramic connected at a predetermined position is obtained.
次に２本発明について図面を参照しながら説明する。 Next, two aspects of the present invention will be explained with reference to the drawings.
第２図は本発明の光学ヘッドの一実施例を示す構成図で
ある。FIG. 2 is a configuration diagram showing an embodiment of the optical head of the present invention.
レーザ光源２０１から放出された光ビーム２０２はコリ
メートレンズ２０３により平行光１０６となる。平行光
１０６は、偏光プリズム２０４を通過後、′Ｖ／４波長
板２０５．全反射プリズム２０６を経て対物レンズ２０
７で収束される。収束された２１】で反射され、この反
射光１１２は再び対物レンズ２ｏ７．Ｖ４波長板２０５
を通過して偏光プリズム２０４に戻る。反射光２１２は
只波長板２０５を往復するが、入射時とは直交する偏波
面を有する直線偏光となっている故、ノ・−フォ−カス
方向のみに進行する。ノ・−フミラー２１３では記録情
報の回折パターンは２方向に分けられ。A light beam 202 emitted from a laser light source 201 is turned into parallel light 106 by a collimating lens 203 . After passing through the polarizing prism 204, the parallel light 106 passes through the 'V/4 wavelength plate 205. Objective lens 20 via total reflection prism 206
It converges in 7. 21], and this reflected light 112 is again reflected by the objective lens 2o7. V4 wavelength plate 205
and returns to the polarizing prism 204. The reflected light 212 simply travels back and forth through the wave plate 205, but since it is linearly polarized light with a plane of polarization perpendicular to that at the time of incidence, it travels only in the no-focus direction. In the no-f mirror 213, the diffraction pattern of recorded information is divided into two directions.
トラック検出器２１４とフォーカス検出器２１５とに照
射される。The track detector 214 and focus detector 215 are irradiated.
トラック検出器２１４ではトラック２１０からの位置ず
れ信号としてトラック信号２１６を出力し、トラックエ
ラーフィードバック回路２１７を介してトラック駆動信
号２１８を第１の積層圧電セラミック２１９に入力せし
める。フォーカス検出器２１５からの位置ずれ信号であ
るフォーカス（９号２２０ハフオ一カスエラーフイード
バツク回路２２１を介してフォーカス駆動信号２２２を
第２の積層圧電セラミック２２３に入力せしめる。The track detector 214 outputs a track signal 216 as a positional deviation signal from the track 210, and inputs a track drive signal 218 to the first laminated piezoelectric ceramic 219 via a track error feedback circuit 217. A focus drive signal 222, which is a positional deviation signal from the focus detector 215 (No. 9 220), is inputted to the second laminated piezoelectric ceramic 223 via a focus error feedback circuit 221.
また、トラック検出器２１４．フォーカス検出器２１５
の一方（ここではフォーカス検出器２１５）からは記録
情報２１１の総和の差異を描出して記録信号２２４が検
出される。Additionally, the track detector 214. Focus detector 215
A recorded signal 224 is detected from one of the two (here, the focus detector 215) by depicting the difference in the total sum of the recorded information 211.
トラック駆動信号２１８で縦方向（長さ方向）に伸縮す
る第１の積層圧電セラミック２１９は一端２２５が支持
体２２６に固定され、他端２２７は第１の弾性体２２８
の所定の比例配分位置２２９に連結されている。第１の
弾性体２２８は−ＹｉｉＡ２３０がトラックに直角た方
向に移動可能で、対物レンズ２０７及び全反射プリズム
２０６を支持する保持枠２３１を含む照射手段２３２に
連結しており、他端２３３は支持体２２６に固定されて
いる。なお、全反射プリズム２０６を固定し、対物レン
ズ２０７のみを保持枠２３１で支持してもよい。第１の
弾性体２２８は、縦効果を利用する第１の積層圧電セラ
ミック２１９の駆動力が強力であることから、剛性の大
きな材料及び形状とする。このようにして、第１の積層
圧電セラミック２ノ１９と第１の弾性体２２８とで対物
レンズ２０７を含む照射手段２３２をトラックに直角な
方向へ追従して位置制御するトラック制御系を構成して
いる。すなわち、積層圧電セラミック２１９がトラック
駆動信号２１８に応じて伸縮することによシ２弾性体２
２８の端部２３０がトラックに直角な方向へ変位し、照
射手段２３２を介して光スポラｌ−２０８の位置ずれが
補正される。A first laminated piezoelectric ceramic 219 that expands and contracts in the longitudinal direction (lengthwise direction) in response to a track drive signal 218 has one end 225 fixed to a support 226 and the other end 227 connected to a first elastic body 228.
is connected to a predetermined proration position 229 of The first elastic body 228 -YiiA 230 is movable in a direction perpendicular to the track, and is connected to an irradiation means 232 including a holding frame 231 that supports an objective lens 207 and a total reflection prism 206, and the other end 233 is a support It is fixed to the body 226. Note that the total reflection prism 206 may be fixed and only the objective lens 207 may be supported by the holding frame 231. The first elastic body 228 is made of a material and has a shape with high rigidity because the driving force of the first laminated piezoelectric ceramic 219 that utilizes the longitudinal effect is strong. In this way, the first laminated piezoelectric ceramic 2-19 and the first elastic body 228 constitute a track control system that controls the position of the irradiation means 232 including the objective lens 207 by tracking it in a direction perpendicular to the track. ing. That is, as the laminated piezoelectric ceramic 219 expands and contracts in response to the track drive signal 218, the elastic body 2
The end portion 230 of the optical spoiler 208 is displaced in a direction perpendicular to the track, and the displacement of the optical spoiler l-208 is corrected via the irradiation means 232.
一方、フォーカス駆動信号２２２で縦方向（長さ方向）
に伸縮する第２の積層圧電セラミック２２３は、第１の
積層圧電セラミック２１９と空間を隔てて直交するよう
に配置しており、一端２３４が支持体２２６に固定され
、他端２３５が第２の弾性体２３６の所定の分割位置２
３７に連結されている。第２の弾性体２３６は一端２３
８がフォーカス方向への移動が可能で、第１の弾性体２
２８とは照射手段２３２に関して直交するごとく連結さ
れておシ、他端２３９は支持体２２６に固定されている
。また、第１の弾性体２２８と同様、第２の弾性体２３
６も剛性の大きな材料及び形状としている。このように
して、第２の積層圧電セラミック２２３と第２の弾性体
２３６とで照射手段２３２を光軸方向に追従して位置制
御するフォーカス制御系を構成している。すなわち。On the other hand, with the focus drive signal 222, the vertical direction (length direction)
A second laminated piezoelectric ceramic 223 that expands and contracts is arranged so as to be perpendicular to the first laminated piezoelectric ceramic 219 with a space therebetween. Predetermined division position 2 of elastic body 236
It is connected to 37. The second elastic body 236 has one end 23
8 is movable in the focus direction, and the first elastic body 2
28 is connected perpendicularly with respect to the irradiation means 232, and the other end 239 is fixed to the support body 226. Further, similar to the first elastic body 228, the second elastic body 23
6 is also made of a highly rigid material and shape. In this way, the second laminated piezoelectric ceramic 223 and the second elastic body 236 constitute a focus control system that controls the position of the irradiation means 232 by tracking it in the optical axis direction. Namely.
トラック制御系と同様、積層圧電セラミック２２３がフ
ォーカス駆動信号２２２に応じて伸縮することによシ２
弾性体２３６．照射手段２３２を介して光スポット２０
８の焦点ずれが補正される。Similar to the track control system, the laminated piezoelectric ceramic 223 expands and contracts in response to the focus drive signal 222.
Elastic body 236. Light spot 20 via irradiation means 232
8 defocus is corrected.
本発明によれば、トラック制御系、フォーカス制御系が
積層圧電セラミック、弾性体及び支持体で構成されるこ
とから構成が簡単で、高精度加工。According to the present invention, since the track control system and the focus control system are composed of a laminated piezoelectric ceramic, an elastic body, and a support body, the structure is simple and high-precision processing is possible.
組立て及び材料選択等が緩和されるという利点があると
共に低価額が見込める。また、縦効果を利用する積層圧
電セラミックは電気変換効率が５０係程度であり、電磁
駆動方式に比し３〜４倍の効率の改善が外される。さら
に、積層圧電セラミックの駆動力は数１００ｋｇ／／ｃ
Ｔｎ２と強力であることから。It has the advantage of easing assembly, material selection, etc., and can be expected to be inexpensive. Furthermore, the electrical conversion efficiency of the laminated piezoelectric ceramic that utilizes the longitudinal effect is about 50 factors, which is an improvement in efficiency of 3 to 4 times compared to the electromagnetic drive method. Furthermore, the driving force of the laminated piezoelectric ceramic is several 100 kg//c
Because it is Tn2 and powerful.
弾性体に剛性の大きな材料及び構造になすことができ、
信頼性の改善が削れる。The elastic body can be made of highly rigid materials and structures,
Reliability improvement will be reduced.
第１図は従来の電磁駆動方式による光学ヘッドの駆動機
構を示す図、第２図は本発明の一実施例の光学ヘッドの
構成図である。
２０Ｊ・レーザ光源、２０７・・・対物レンズ。
２０９ 配録媒体、２１０・トラック、２０８・光ス、
ｊ？ノド、２１１・・・記録情！、２３２・・照射手段
、２２６ ・支持体、２２８・・・第１の弾性体。
２３６・・第２の弾性体、２１９・・・第１の積層圧電
セラミック、２２３・・・第２の積層圧電セラミック。
２１８・・・トラック、駆動信号、２２２・・・フォー
カス駆動信号。
第１図FIG. 1 is a diagram showing a drive mechanism for an optical head using a conventional electromagnetic drive method, and FIG. 2 is a diagram showing the configuration of an optical head according to an embodiment of the present invention. 20J. Laser light source, 207... Objective lens. 209 recording medium, 210 track, 208 light beam,
j? Nodo, 211...record information! , 232... Irradiation means, 226 - Support body, 228... First elastic body. 236... Second elastic body, 219... First laminated piezoelectric ceramic, 223... Second laminated piezoelectric ceramic. 218...Track, drive signal, 222...Focus drive signal. Figure 1
Claims (1)
検出する光学ヘッドにおいて、前記光スポットを形成す
る対物レンズを含む照射手段の位置を、トラ２りに４角
な方向へ追従して制御するトラ、り制御系と光軸方向へ
追従して制御するフォーカス制御系とを備え、前記トラ
ック制御系は一端を前記照射手段に固定し他端を固定支
持体に固定した第１の弾性体と、一端を前記固定支持体
に固定し他端を前記第１の弾性体の所定位置に連結した
第２１の積層圧電セラミックとで構成し、前記フォーカ
ス制御系は一端を前記固定支持体に固定し他端を前記照
射手段に関して前記第１の弾性体と直交するように前記
照射手段に固定した第２の弾性体と、一端を前記固定支
持体に固定し他端を前記第２の弾性体の所定位置に連結
した第２の積層圧電セラミックとで構成したことを特徴
とする光学ヘッド。1. In an optical head that detects recorded information from a rotating recording medium by a light spot, a tracker that controls the position of an irradiation means including an objective lens that forms the light spot by following the tracker 2 in a four-cornered direction; the track control system includes a first elastic body having one end fixed to the irradiation means and the other end fixed to a fixed support; and a 21st laminated piezoelectric ceramic having one end fixed to the fixed support and the other end connected to a predetermined position of the first elastic body, and the focus control system has one end fixed to the fixed support and the other end connected to a predetermined position of the first elastic body. a second elastic body fixed to the irradiation means so as to be perpendicular to the first elastic body with respect to the irradiation means, and one end fixed to the fixed support and the other end at a predetermined position of the second elastic body and a second laminated piezoelectric ceramic connected to the optical head.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6665384A JPS60211642A (en) | 1984-04-05 | 1984-04-05 | Optical head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6665384A JPS60211642A (en) | 1984-04-05 | 1984-04-05 | Optical head |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60211642A true JPS60211642A (en) | 1985-10-24 |
Family
ID=13322068
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6665384A Pending JPS60211642A (en) | 1984-04-05 | 1984-04-05 | Optical head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60211642A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0768649A2 (en) * | 1995-10-09 | 1997-04-16 | Balzers und Leybold Deutschland Holding Aktiengesellschaft | Laser beam irradiation device for a disk-shaped substrate |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS547307A (en) * | 1977-06-20 | 1979-01-20 | Sony Corp | Optical video disc reproducer |
| JPS55153135A (en) * | 1979-05-16 | 1980-11-28 | Hitachi Ltd | Optical recording and reproducing device |
| JPS58222449A (en) * | 1982-06-18 | 1983-12-24 | Matsushita Electric Ind Co Ltd | Actuator of optical disk |
-
1984
- 1984-04-05 JP JP6665384A patent/JPS60211642A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS547307A (en) * | 1977-06-20 | 1979-01-20 | Sony Corp | Optical video disc reproducer |
| JPS55153135A (en) * | 1979-05-16 | 1980-11-28 | Hitachi Ltd | Optical recording and reproducing device |
| JPS58222449A (en) * | 1982-06-18 | 1983-12-24 | Matsushita Electric Ind Co Ltd | Actuator of optical disk |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0768649A2 (en) * | 1995-10-09 | 1997-04-16 | Balzers und Leybold Deutschland Holding Aktiengesellschaft | Laser beam irradiation device for a disk-shaped substrate |
| EP0768649A3 (en) * | 1995-10-09 | 1998-02-11 | Balzers und Leybold Deutschland Holding Aktiengesellschaft | Laser beam irradiation device for a disk-shaped substrate |
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