JPH0132176Y2 - - Google Patents
Info
- Publication number
- JPH0132176Y2 JPH0132176Y2 JP1982178775U JP17877582U JPH0132176Y2 JP H0132176 Y2 JPH0132176 Y2 JP H0132176Y2 JP 1982178775 U JP1982178775 U JP 1982178775U JP 17877582 U JP17877582 U JP 17877582U JP H0132176 Y2 JPH0132176 Y2 JP H0132176Y2
- Authority
- JP
- Japan
- Prior art keywords
- optical system
- optical
- optical axis
- axis direction
- supporting member
- 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
- 230000003287 optical effect Effects 0.000 claims description 55
- 230000007246 mechanism Effects 0.000 claims description 14
- 230000008878 coupling Effects 0.000 claims description 6
- 238000010168 coupling process Methods 0.000 claims description 6
- 238000005859 coupling reaction Methods 0.000 claims description 6
- 230000005484 gravity Effects 0.000 claims description 5
- 230000001678 irradiating effect Effects 0.000 claims 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- DMFGNRRURHSENX-UHFFFAOYSA-N beryllium copper Chemical compound [Be].[Cu] DMFGNRRURHSENX-UHFFFAOYSA-N 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007373 indentation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
Landscapes
- Optical Recording Or Reproduction (AREA)
Description
【考案の詳細な説明】
本考案は、光学式情報読取装置におけるピツク
アツプ装置に関する。[Detailed Description of the Invention] The present invention relates to a pickup device in an optical information reading device.
光学式情報読取装置において、情報記録媒体で
ある例えばビデオデイスクあるいはデイジタルオ
ーデイオデイスクなどのデイスクは、その表面に
情報信号に応じた微細なピツト（へこみ）を渦巻
状のトラツクとして形成することによつて当該情
報信号を収録するものである。かかるデイスクを
再生する場合、このデイスクを所定回転数で回転
させつつそのトラツク状にスポツト光を照射せし
めてその反射光若しくは透過光の強さの変化を電
気信号に変換し、元の情報信号として再生するも
のである。 In an optical information reading device, the information recording medium, such as a video disk or a digital audio disk, is read by forming minute pits (indentations) in the form of spiral tracks on its surface in accordance with the information signal. This information signal is recorded. When reproducing such a disc, the disc is rotated at a predetermined number of revolutions and a spot light is irradiated onto the track thereof, and changes in the intensity of the reflected or transmitted light are converted into electrical signals, which are then used as the original information signals. It is something to be regenerated.
このデイスクの再生においては、デイスクの記
録面上に照射光を正確に集束しなければならずそ
のために光学系の記録面に垂直な方向すなわちフ
オーカス方向における位置の制御（フオーカスサ
ーボ）が必要であり、また記録トラツクを照射光
が常に正確にトラツキングしなければならないた
めにデイスクの半径方向すなわちトラツキング方
向への照射光の制御（トラツキングサーボ）が必
要である。 When playing back this disk, the irradiated light must be accurately focused on the recording surface of the disk, which requires position control (focus servo) in the direction perpendicular to the recording surface of the optical system, that is, in the focus direction. In addition, since the irradiation light must always accurately track the recording track, it is necessary to control the irradiation light in the radial direction of the disk, that is, in the tracking direction (tracking servo).
そのために情報読取装置の読取ピツクアツプ装
置においては、情報読取用のスポツト光をデイス
ク記録面に照射せしめる光学系をフオーカス方向
及びトラツキング方向に移動自在に支持する支持
機構と、フオーカスエラー信号及びトラツキング
エラー信号に応じて該フオーカス方向及びトラツ
キング方向に光学系を駆動する駆動装置とが設け
られている。 To this end, the reading pick-up device of the information reading device requires a support mechanism that movably supports the optical system that irradiates the disk recording surface with a spot light for information reading in the focus direction and the tracking direction, and a support mechanism that supports a focus error signal and a tracking direction. A driving device is provided for driving the optical system in the focusing direction and the tracking direction in accordance with the error signal.
かかるピツクアツプ装置は、従来種々提案され
ており、その１例を第１図に示す。 Various such pickup devices have been proposed in the past, one example of which is shown in FIG.
図示されるように、一端が固定された片持梁状
部材１の自由端に、対物レンズ２及び筒状部３を
有する光学系４が固着されている。片持梁状部材
１は、デイスク記録面（図示せず）に平行に配設
されており、光学系４の光軸方向すなわちフオー
カス方向Ｚにのみ可撓な板バネ部５と、該フオー
カス方向と垂直なトラツキング方向Ｘにのみ可撓
な板バネ部６とを有している。 As shown in the figure, an optical system 4 having an objective lens 2 and a cylindrical portion 3 is fixed to a free end of a cantilever-like member 1 having one end fixed. The cantilever member 1 is arranged parallel to a disk recording surface (not shown), and includes a leaf spring portion 5 that is flexible only in the optical axis direction of the optical system 4, that is, in the focus direction Z, and a leaf spring portion 5 that is flexible only in the direction of the optical axis of the optical system 4, that is, in the focus direction Z. It has a leaf spring part 6 which is flexible only in the tracking direction X perpendicular to the .
筒状部３の下方に固着された円形のボビン７に
はフオーカス方向Ｚへの駆動用コイル８が巻装さ
れており、筒状部３にトラツキング方向Ｘに突出
して設けられた一対のボビン９にはトラツキング
方向Ｘへの駆動用コイル１０が巻装されている。
また、各駆動用コイル８及び１０にそれぞれ電磁
駆動力を付与せしめるための磁気回路（図示せ
ず）が設けられている。駆動用コイル８及び１０
に適当な電流が供給されると、板バネ部５及び６
がフオーカス方向Ｚ及びトラツキング方向Ｘに
各々撓んで光学系４が駆動されるのである。 A circular bobbin 7 fixed to the lower part of the cylindrical part 3 is wound with a driving coil 8 for driving in the focus direction Z, and a pair of bobbins 9 are provided on the cylindrical part 3 to protrude in the tracking direction X. A driving coil 10 for driving in the tracking direction X is wound around.
Further, magnetic circuits (not shown) are provided for applying electromagnetic driving force to each of the driving coils 8 and 10, respectively. Drive coils 8 and 10
When a suitable current is supplied to the leaf spring parts 5 and 6,
is bent in the focusing direction Z and tracking direction X, respectively, and the optical system 4 is driven.
上記した形式のピツクアツプ装置においては、
光学系の支持機構が、フオーカス方向あるいはト
ラツキング方向の何れか一方向のみの自由度を有
する２つの支持機構の組み合わせによつて構成さ
れている。従つて、構造が複雑であり、製作が難
しかつた。また、２つの支持機構を組み合わせる
ことから、大きな体積を必要とし、小形化が図り
難く、寄生共振が起こり易いという欠点もあつ
た。 In the above-mentioned type of pick-up device,
The support mechanism of the optical system is configured by a combination of two support mechanisms having a degree of freedom in only one direction, either the focus direction or the tracking direction. Therefore, the structure is complicated and manufacturing is difficult. Furthermore, since two support mechanisms are combined, a large volume is required, making it difficult to downsize the device, and parasitic resonance is likely to occur.
そこで本考案は、構造が簡単で小形化し易いピ
ツクアツプ装置を提供することを目的とする。 Therefore, an object of the present invention is to provide a pickup device that has a simple structure and is easy to downsize.
本考案によるピツクアツプ装置は、光学系をそ
の光軸方向及びこれに垂直な所定方向の２方向に
おいて移動自在に支持する支持機構が該２方向に
おける可撓性を併せ持つ複数本の片持梁状弾性細
長部材から成り、該各弾性細長部材の各々の自由
端は光学系担持部材に対して互いに異なる結合位
置にて結合せられ、各結合位置を結ぶ直線が光学
系及び光学系担持部材から成る可動部の重心を通
ることを特徴とする。 In the pick-up device according to the present invention, the support mechanism that supports the optical system movably in two directions, ie, the optical axis direction and a predetermined direction perpendicular to the optical axis direction, has a plurality of cantilever-like elastic structures that have flexibility in the two directions. an elongate member, each free end of each elastic elongate member being coupled to the optical system carrier member at different coupling positions, and a straight line connecting each coupling position being a movable member comprising the optical system and the optical system carrier member. It is characterized by passing through the center of gravity of the part.
以下、本考案に係るピツクアツプ装置を図面を
参照しつつ説明する。 Hereinafter, a pickup device according to the present invention will be explained with reference to the drawings.
第２図及び第３図に示されるように、光学系担
持部材１１に設けられた円形のボビン部１２の外
周には、光学系の光軸方向すなわちフオーカス方
向Ｚへの駆動用コイル１３が円周方向に巻装され
ている。光学系担持部材１１の筒状部１４には一
対の略矩形状のボビン部１５及び１６が上記光軸
方向と垂直な方向すなわちトラツキング方向Ｘに
突出して設けられており、このボビン部１５及び
１６には各々フオーカス方向Ｘへの駆動用コイル
１７及び１８が巻装されている。また、１９は筒
状部１４内に嵌着された対物レンズであり、筒状
部１４と共に光学系の一部を構成している。 As shown in FIGS. 2 and 3, on the outer periphery of the circular bobbin portion 12 provided on the optical system supporting member 11, a driving coil 13 is arranged circularly in the optical axis direction of the optical system, that is, in the focus direction Z. Wrapped in the circumferential direction. A pair of substantially rectangular bobbin portions 15 and 16 are provided on the cylindrical portion 14 of the optical system supporting member 11 so as to protrude in a direction perpendicular to the optical axis direction, that is, in the tracking direction X. Driving coils 17 and 18 in the focus direction X are wound around each of the drive coils 17 and 18. Further, reference numeral 19 denotes an objective lens fitted within the cylindrical portion 14, and together with the cylindrical portion 14 constitutes a part of the optical system.
固定部２０の上下面には、フオーカス方向Ｚ及
びトラツキング方向Ｘに各々直角な溝２１が各２
条ずつ合計４条設けられている。該４条の溝に
は、該フオーカス方向及びトラツキング方向にお
いて可撓な４本の弾性細長部材２２の各一端が嵌
合し且つ接着剤などで固定されている。弾性細長
部材２２は、例えばベリリウム銅などから成り、
４本が略同じ長さに且つその長手方向に直角な断
面が矩形であるように形成されている。 There are two grooves 21 perpendicular to the focusing direction Z and the tracking direction X on the upper and lower surfaces of the fixing part 20, respectively.
There are a total of 4 articles in each section. One end of each of the four elastic elongated members 22, which are flexible in the focusing direction and the tracking direction, is fitted into the four grooves and fixed with an adhesive or the like. The elastic elongated member 22 is made of, for example, beryllium copper,
The four rods are formed to have approximately the same length and a rectangular cross section perpendicular to the longitudinal direction.
上記のように、固定部２０に片持梁状に固定さ
れた弾性細長部材２２の各自由端は、筒状部１４
の外周面に結合部材２３によつて互いに異なる結
合位置にて結合されている。第３図に明らかなよ
うに、弾性細長部材２２と筒状部１４の結合点
は、該結合点を結ぶ直線Ａ−Ａ及びＢ−Ｂが光学
系及び光学系担持部材１１からなる可動部の重心
（Ｇ点）を通過するように位置決めされている。 As mentioned above, each free end of the elastic elongate member 22 cantilevered to the fixed part 20 is connected to the cylindrical part 14.
are connected to the outer circumferential surfaces of the connecting members 23 at mutually different connecting positions. As is clear from FIG. 3, the connecting point between the elastic elongated member 22 and the cylindrical portion 14 is such that the straight lines A-A and B-B connecting the connecting points are the connecting points of the optical system and the movable part consisting of the optical system supporting member 11. It is positioned so as to pass through the center of gravity (point G).
また、固定部２０には、各駆動用コイル１３，
１７及び１８に対応して、該各駆動用コイルに
夫々電磁駆動力を付与せしめるための磁気回路
（図示せず）が設けられている。 Further, the fixed part 20 includes each driving coil 13,
Corresponding to 17 and 18, magnetic circuits (not shown) are provided for applying electromagnetic driving force to each of the driving coils.
ピツクアツプ装置の読取動作中、駆動用コイル
１３，１７及び１８に各々適当な電流が供給され
ると、弾性細長部材２２がフオーカス方向Ｚ及び
トラツキング方向Ｘに随時撓んで光学系が該両方
向に駆動されるのである。 During the reading operation of the pick-up device, when appropriate currents are supplied to each of the drive coils 13, 17, and 18, the elastic elongated member 22 is bent at any time in the focusing direction Z and the tracking direction X, and the optical system is driven in both directions. It is.
ここで、上記のように、弾性細長部材２２と筒
状部１４の結合点を結ぶ直線が光学系１１の重心
を通過するようになすことによつて、光学系１１
は、回転することなくトラツキング方向Ｘあるい
はフオーカス方向Ｚに平行に駆動され、害となる
振動の発生が抑えられて記録情報の読み取りが高
精度に且つ円滑に行なわれるのである。なお、第
３図から明らかな如く、トラツキング方向Ｘ及び
フオーカス方向Ｚにおけるピツクアツプの駆動中
心はこの重心を通る。 Here, as described above, the optical system 11 is
is driven parallel to the tracking direction X or the focus direction Z without rotating, suppressing the generation of harmful vibrations and reading recorded information with high precision and smoothly. As is clear from FIG. 3, the drive center of the pickup in the tracking direction X and focus direction Z passes through this center of gravity.
尚、弾性細長部材２２の断面形状は、上記のよ
うな矩形に限らず、例えば円形あるいは正方形な
どでも良い。但し、断面形状を矩形とすることに
よつてフオーカス方向Ｚ及びトラツキング方向Ｘ
における断面寸法に変化を与え、弾性細長部材２
２の上記各方向における曲げ剛性を適当に定める
ことが可能となり、弾性細長部材２２の上記各方
向の低域振周波数を都合の良い任意の周波数とす
ることが出来る。又、断面積が同じであるなら
ば、断面形状を矩形とすることによつてねじれ剛
性を最大にすることが可能となる。 Note that the cross-sectional shape of the elastic elongated member 22 is not limited to the rectangular shape described above, but may be circular or square, for example. However, by making the cross-sectional shape rectangular, the focus direction Z and tracking direction
The elastic elongated member 2
It becomes possible to appropriately determine the bending rigidity of the elastic member 22 in each of the above-mentioned directions, and the low-frequency vibration frequency of the elastic elongated member 22 in each of the above-mentioned directions can be set to any convenient frequency. Further, if the cross-sectional area is the same, it is possible to maximize the torsional rigidity by making the cross-sectional shape rectangular.
一方、断面を円形あるいは正方形とする場合
は、断面形状の方向性がないので、例えば市販の
線材を適当な長さに切断するだけでの成形も可能
となり、組立作業を簡単に出来ると共にコストを
下げることが可能となる。 On the other hand, when the cross-section is circular or square, there is no directionality in the cross-sectional shape, so it is possible to form it by simply cutting a commercially available wire material to an appropriate length, which simplifies assembly work and reduces costs. It is possible to lower it.
以上詳述した如く、本考案によるピツクアツプ
装置においては、光学系をその光軸方向及びこれ
に垂直な所定方向の２方向において移動自在に支
持する支持機構が該２方向における可撓性を併せ
持つ複数本の片持梁状弾性細長部材から成り、該
各弾性細長部材の各々の自由端は光学系担持部材
に対して互いに異なる結合位置にて結合せられ、
各結合位置を結ぶ直線が光学系及び光学系担持部
材から成る可動部の重心を通る。 As detailed above, in the pick-up device according to the present invention, the support mechanism that supports the optical system movably in two directions, the optical axis direction and a predetermined direction perpendicular to the optical axis direction, has a plurality of support mechanisms that have flexibility in the two directions. comprising a cantilevered elastic elongate member, each free end of each elastic elongate member being coupled to the optical system carrying member at a mutually different coupling position;
A straight line connecting each coupling position passes through the center of gravity of the movable part consisting of the optical system and the optical system supporting member.
すなわち、光軸方向及びこれに直角な方向の２
方向のうちいずれか一方向ずつの自由度を持つ２
つの支持機構の組み合わせによつて構成される支
持機構を備えた従来のピツクアツプ装置に比して
構造が簡単であり組み立て作業が容易となつてい
るのである。 In other words, two directions: the optical axis direction and the direction perpendicular to this.
2 with degrees of freedom in each direction
The structure is simpler and the assembly work is easier than the conventional pick-up device which has a support mechanism constructed by a combination of two support mechanisms.
また、本考案による光学式情報読取装置におけ
るピツクアツプ装置においては、上記のように光
学系の支持が１つの支持機構によつてなされるの
で、２つの支持機構を組み合わせることを必要と
していた従来のピツクアツプ装置に比して装置全
体の小形化が容易となつているのである。 Furthermore, in the pick-up device of the optical information reading device according to the present invention, the optical system is supported by one support mechanism as described above, which is different from the conventional pick-up device which required a combination of two support mechanisms. This makes it easier to downsize the entire device.
第１図は従来のピツクアツプ装置を示す図、第
２図は本考案に係るピツクアツプ装置の斜視図、
第３図は該ピツクアツプ装置の断面図である。
主要部分の符号の説明、１１……光学系担持部
材、１２，１５，１６……ボビン部、１３，１
７，１８……駆動用コイル、１４……筒状部、１
９……対物レンズ、２０……固定部、２２……弾
性細長部材。
FIG. 1 is a diagram showing a conventional pickup device, FIG. 2 is a perspective view of a pickup device according to the present invention,
FIG. 3 is a sectional view of the pickup device. Explanation of symbols of main parts, 11... Optical system supporting member, 12, 15, 16... Bobbin part, 13, 1
7, 18... Drive coil, 14... Cylindrical part, 1
9... Objective lens, 20... Fixed part, 22... Elastic elongated member.
Claims (1)
ための光学系を基体に担持する光学系担持部材
と、前記光学系担持部材を前記光学系の光軸方向
及び前記光軸方向に対して垂直な所定方向におい
て移動可能に且つ前記光学系の光軸が前記記録面
に対して垂直であるように支持する支持機構と、
前記光学系を前記光軸方向及び所定方向に駆動す
る駆動手段とを含むピツクアツプ装置であつて、
前記支持機構は一端が前記基体に固着されて前記
光学系担持部材に他端にて異なる結合位置で結合
し前記光軸方向及び所定方向のいずれの方向にお
いても可撓な複数の片持梁状弾性細長部材から成
り、前記結合位置を結ぶ直線が前記光学系及び前
記光学系担持部材から成る可動部の重心を通るこ
とを特徴とする光学式情報読取装置におけるピツ
クアツプ装置。 an optical system supporting member that supports an optical system on a base for irradiating a recording surface of a recording medium with spot light; and an optical system supporting member that supports the optical system in an optical axis direction of the optical system and a predetermined position perpendicular to the optical axis direction. a support mechanism that supports the optical system movably in the direction and such that the optical axis of the optical system is perpendicular to the recording surface;
A pickup device comprising a driving means for driving the optical system in the optical axis direction and a predetermined direction,
The support mechanism includes a plurality of cantilever beams, one end of which is fixed to the base, the other end of which is coupled to the optical system supporting member at different coupling positions, and is flexible in either the optical axis direction or a predetermined direction. 1. A pick-up device for an optical information reading device, comprising an elastic elongated member, wherein a straight line connecting the coupling positions passes through the center of gravity of a movable part comprising the optical system and the optical system supporting member.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17877582U JPS5982338U (en) | 1982-11-26 | 1982-11-26 | Pickup device for optical information reading device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17877582U JPS5982338U (en) | 1982-11-26 | 1982-11-26 | Pickup device for optical information reading device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5982338U JPS5982338U (en) | 1984-06-04 |
| JPH0132176Y2 true JPH0132176Y2 (en) | 1989-10-03 |
Family
ID=30388050
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17877582U Granted JPS5982338U (en) | 1982-11-26 | 1982-11-26 | Pickup device for optical information reading device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5982338U (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0646459B2 (en) * | 1986-07-04 | 1994-06-15 | 三洋電機株式会社 | Optical pickup device |
| JPH0750527B2 (en) * | 1986-06-06 | 1995-05-31 | オリンパス光学工業株式会社 | Objective lens drive |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5936030B2 (en) * | 1982-05-18 | 1984-08-31 | 東洋リノリユ−ム株式会社 | Pile forming method |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57191942U (en) * | 1981-05-29 | 1982-12-06 | ||
| JPS5936030U (en) * | 1982-04-26 | 1984-03-06 | 株式会社日立製作所 | Objective lens drive device |
| JPS58165738U (en) * | 1982-04-28 | 1983-11-04 | 株式会社日立製作所 | Objective lens drive device |
-
1982
- 1982-11-26 JP JP17877582U patent/JPS5982338U/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5936030B2 (en) * | 1982-05-18 | 1984-08-31 | 東洋リノリユ−ム株式会社 | Pile forming method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5982338U (en) | 1984-06-04 |
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