JPH048483Y2 - - Google Patents
Info
- Publication number
- JPH048483Y2 JPH048483Y2 JP19470484U JP19470484U JPH048483Y2 JP H048483 Y2 JPH048483 Y2 JP H048483Y2 JP 19470484 U JP19470484 U JP 19470484U JP 19470484 U JP19470484 U JP 19470484U JP H048483 Y2 JPH048483 Y2 JP H048483Y2
- Authority
- JP
- Japan
- Prior art keywords
- lens holding
- operation coil
- lens
- objective lens
- holding tube
- 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
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 230000007935 neutral effect Effects 0.000 description 6
- 230000003287 optical effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
Landscapes
- Mechanical Optical Scanning Systems (AREA)
- Optical Recording Or Reproduction (AREA)
Description
【考案の詳細な説明】
＜本考案の技術分野＞
本有案はデイスク上に記録された情報を光学的
に読み取る光学的情報読取装置に適用される対物
レンズ装置に関するものである。[Detailed Description of the Invention] <Technical Field of the Present Invention> The present invention relates to an objective lens device applied to an optical information reading device that optically reads information recorded on a disk.
＜考案の概要＞
本考案は外周にフオーカス動作用及びトラツキ
ング動作用コイルを後者を外側にして固着したレ
ンズ保持筒に対応して上記各コイルと共に磁気回
路を構成するヨーク、マグネツトを配置した対物
レンズ装置において、上記レンズ保持筒の外側に
設けられた外側ヨークの内側面に上記トラツキン
グ動作用コイルを避ける切欠きを設けることによ
り対物レンズ装置を小型化できるようにしたもの
である。<Summary of the invention> The present invention is an objective lens in which a yoke and a magnet, which constitute a magnetic circuit together with the above-mentioned coils, are arranged in correspondence with a lens holding tube in which focusing and tracking coils are fixed on the outer periphery with the latter fixed on the outside. In the apparatus, the objective lens apparatus can be miniaturized by providing a notch on the inner surface of the outer yoke provided on the outside of the lens holding cylinder to avoid the tracking operation coil.
＜従来の技術＞
光学的情報読取装置の対物レンズ装置の従来例
としては例えば特開昭57−210456号公報等に示さ
れる「対物レンズ装置」があるが、このような従
来の対物レンズ装置では外周面にフオーカス動作
用コイルを介してトラツキング動作用コイルを固
着したレンズ保持筒の外側に単に上記フオーカス
動作用コイルの外周面に沿う円弧状内面を有する
外側ヨークを配置した構造となつている。<Prior art> As a conventional example of an objective lens device for an optical information reading device, there is an “objective lens device” disclosed in Japanese Patent Laid-Open No. 57-210456, etc.; It has a structure in which an outer yoke having an arcuate inner surface along the outer circumference of the focus operation coil is simply disposed on the outside of a lens holding cylinder to which a tracking operation coil is fixed via a focus operation coil.
＜本考案が解決しようとする問題点＞
しかし乍ら、斯る従来装置ではトラツキング動
作用コイルの厚み分だけ上記フオーカス動作用コ
イルと外側ヨーク及びマグネツトとの隙間が大き
くなり、その結果装置の小型化ができなくなると
共に磁力が小さくなつてレンズ保持筒を十分駆動
できなくなるとの欠点を有していた。<Problems to be Solved by the Present Invention> However, in such conventional devices, the gap between the focusing coil and the outer yoke and magnet becomes larger by the thickness of the tracking coil, resulting in a smaller device. This has disadvantages in that the lens holding cylinder cannot be sufficiently driven because the magnetic force becomes small and the lens holding cylinder cannot be moved sufficiently.
＜問題点を解決する手段＞
本考案は上記従来装置の欠点に鑑みて考案され
たものであり、第１図に示すようにベース本体１
上に対物レンズ１１を保持したレンズ保持筒６を
回動かつ上下動自在に支持すると共にレンズ保持
筒６の外周側面にフオーカス動作用コイル１３及
びトラツキング動作用コイル１４を後者を外側に
して固着し、かつ、上記ベース本体１上には上記
各コイルと共に磁気回路を形成するヨーク５ａ，
５ｂ，１９ａ，１９ｂとマグネツト４ａ，４ｂを
設けたものにおいて、上記レンズ保持督６の外側
に設けられた外側ヨーク１９ａ，１９ｂの内側面
に上記トラツキング動作用コイル１４を避ける切
欠き２０a1，２０a2，２０b1，２０b2を設けた対
部レンズ装置を提供することにより、外側ヨーク
をフオーカス動作用コイルに極力近づけて装置の
小型化を計れると共にレンズ保持筒を十分駆動で
きる磁力を発生できる対物レンズ装置を提供せん
とするものである。<Means for solving the problems> The present invention has been devised in view of the drawbacks of the conventional device described above, and as shown in FIG.
A lens holding tube 6 holding an objective lens 11 thereon is rotatably and vertically movably supported, and a focusing operation coil 13 and a tracking operation coil 14 are fixed to the outer peripheral side of the lens holding tube 6 with the latter on the outside. , and on the base body 1 is a yoke 5a that forms a magnetic circuit together with each of the coils.
5b, 19a, 19b and magnets 4a, 4b, cutouts 20a 1 , 20a are provided on the inner surfaces of the outer yokes 19a, 19b provided outside the lens holding director 6 to avoid the tracking operation coil 14. 2 , 20b 1 , and 20b 2 , the outer yoke can be brought as close as possible to the focus operation coil to reduce the size of the device, and the objective can generate magnetic force sufficient to drive the lens holding cylinder. The present invention aims to provide a lens device.
＜本考案の実施例＞
以下、本考案の一実施例を添付図面に従つて詳
細に説明する。<Embodiment of the present invention> An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.
第１図及び第２図は本考案に係る対物レンズ装
置の斜視図及び平面図、第３図及び第４図は第２
図のＡ−A′線及びＢ−B′線断面図、第５図は同
上対物レンズ装置の分解斜視図であり、図中、１
はベース本体にして、その中央に支点軸２を立設
すると共に該支点軸２を挾む位置に光通路口３と
作業用口４を有し、更に、支点軸２より視てこの
作業用口４の外側の板面上に取付口５を設けてい
る。 1 and 2 are a perspective view and a plan view of an objective lens device according to the present invention, and FIGS. 3 and 4 are a
5 is an exploded perspective view of the same objective lens device, and in the figure, 1
has a base body with a fulcrum shaft 2 erected in the center thereof, an optical passage opening 3 and a working opening 4 at positions sandwiching the fulcrum shaft 2, and furthermore, when viewed from the fulcrum shaft 2, there is a fulcrum shaft 2 for this work. A mounting port 5 is provided on the plate surface outside the port 4.
４ａ，４ｂは上記支点軸２と各孔３乃至５を結
ぶ線と略々直交する線上におけるベース本体１の
上面に上記支点軸２を挾むように固着されたマグ
ネツト、５ａ，５ｂはこれらマグネツト４ａ，４
ｂの上面に固着された内側ヨークにして、マグネ
ツト４ａ，４ｂと共にその外周面を支点軸２を中
心とした円を描く円弧面としている。 4a and 4b are magnets fixed to the upper surface of the base body 1 on a line substantially orthogonal to the line connecting the fulcrum shaft 2 and each hole 3 to 5, so as to sandwich the fulcrum shaft 2; 5a and 5b are the magnets 4a, 4
The inner yoke is fixed to the upper surface of the magnet 4b, and its outer circumferential surface along with the magnets 4a and 4b is an arcuate surface that draws a circle around the fulcrum shaft 2.
６は下面を開口した円筒体より成るレンズ保持
筒にして、上面の閉塞端面を成す天板の下面中央
には軸部７を有し、かつ同天板の中央には上記軸
部７を上下に貫通する支点口８を有すると共に該
支点口８の両側の板面にはレンズ保持口９、バラ
ンスウエイト保持口１０を有している。 Reference numeral 6 designates a lens holding tube made of a cylindrical body with an open bottom surface, and has a shaft portion 7 at the center of the bottom surface of a top plate that forms a closed end surface of the top surface, and the shaft portion 7 is arranged vertically and vertically in the center of the top plate. It has a fulcrum opening 8 penetrating through the fulcrum opening 8, and a lens holding opening 9 and a balance weight holding opening 10 on both sides of the fulcrum opening 8.
そして、このレンズ保持筒６は上記レンズ保持
口９とバランスウエイト保持口１０に夫々対物レ
ンズ１１とバランスウエイト１２を嵌入保持し、
そして、外周面にフオーカス動作用コイル１３を
巻着すると共に該コイル１３の外周面に４個のト
ラツキング動作用コイル１４を固着した上で、支
点口８を以つて支点軸２に回動、かつ、上下動自
在に挿入されるが、このときレンズ保持筒６はそ
の軸部７を以つて中立保持具１５の先端の取着口
１６にトマリバメの状態で取着されることにより
ベース本体１上に浮いた状態と成つている。 The lens holding tube 6 holds an objective lens 11 and a balance weight 12 by fitting them into the lens holding port 9 and balance weight holding port 10, respectively.
Then, a focus operation coil 13 is wound around the outer circumference, and four tracking operation coils 14 are fixed to the outer circumference of the coil 13, and then rotated to the fulcrum shaft 2 through the fulcrum opening 8, and , the lens holding tube 6 is inserted vertically movably, but at this time, the lens holding tube 6 is attached to the attachment opening 16 at the tip of the neutral holder 15 with its shaft portion 7 in a tight fit state, so that the lens holding tube 6 is placed on the base body 1. It is in a floating state.
上記中立保持具１５はゴム等の弾性素材より成
るもので、先端に上記取着口１６を有すると共に
基端に上記ベース本体１上の取付口５に固着され
た中立保持具固定ピン１８に嵌着するための嵌着
口１７を有している。そして、この中立保持具１
５は嵌着口１７を以つて上記中立保持具固定ピン
１８に嵌着されると共にナツト１８′にて螺締さ
れ先端の取着口１６に上記レンズ保持筒６の軸部
７を圧入することによりレンズ保持筒６を支点軸
２と協同して上下動かつ、回動自在に支持するべ
く成つている。 The neutral holder 15 is made of an elastic material such as rubber, and has the attachment hole 16 at its tip and is fitted into the neutral holder fixing pin 18 fixed to the attachment hole 5 on the base body 1 at its base end. It has a fitting opening 17 for fitting. And this neutral holder 1
5 is fitted into the neutral holder fixing pin 18 through the fitting opening 17 and screwed with a nut 18', so that the shaft portion 7 of the lens holding cylinder 6 is press-fitted into the fitting opening 16 at the tip. The lens holding cylinder 6 is supported so as to be vertically movable and rotatable in cooperation with the fulcrum shaft 2.
そして、このようにレンズ保持筒６が支点軸２
に支持された状態では上記マグネツト４ａ，４
ｂ、内側ヨーク５ａ，５ｂ及び中立保持具１５が
レンズ保持筒６の内側に位置している。 In this way, the lens holding cylinder 6 is attached to the fulcrum shaft 2.
When supported by the magnets 4a, 4
b, the inner yokes 5a, 5b and the neutral holder 15 are located inside the lens holding cylinder 6.
１９ａ及び１９ｂは円弧状に形成されると共に
夫々両端部内面に切欠き２０a1，２０a2及び２０
b1，２０b2を設けた外側ヨークにして、支点軸２
に支持されたレンズ保持筒６の外側におけるベー
ス本体１上に固着され、この状態で夫々の切欠き
２０a1，２０a3，２０b1及び２０b2が上記トラツ
キング動作用コイル１４，…に対応させてよりフ
オーカス動作用コイル１３に近づいている。 19a and 19b are formed in an arc shape and have notches 20a 1 , 20a 2 and 20 on the inner surface of both ends, respectively.
b 1 , 20b 2 provided on the outer yoke, and the fulcrum shaft 2
It is fixed on the base body 1 on the outside of the lens holding cylinder 6 supported by the lens holding cylinder 6, and in this state, the respective notches 20a 1 , 20a 3 , 20b 1 and 20b 2 correspond to the tracking operation coils 14, . It is closer to the focus operation coil 13.
即ち、外側ヨーク１９ａ，１９ｂは切欠き２０
a1，２０a2及び２０b1，２０b2を以つてトラツキ
ング動作用コイル１４，…を避け切欠きの無い内
面部分をフオーカス動作用コイル１３により近づ
けている。 That is, the outer yokes 19a and 19b have notches 20
a 1 , 20a 2 and 20b 1 , 20b 2 are used to avoid the tracking operation coils 14, .
本考案は叙上のように構成されるものでるか
ら、フオーカス動作用コイル１３及びトラツキン
グ動作用コイル１４，…に夫々フオーカス動作信
号及びトラツキング動作信号を供給すると、レン
ズ保持筒６はそれに従つて上下動と回動動作を実
行し対物レンズ１１をして光ビームを図示しない
デイスクのトラツク上に合焦させるべく成つてい
る。 Since the present invention is constructed as described above, when a focus operation signal and a tracking operation signal are supplied to the focus operation coil 13 and the tracking operation coil 14, respectively, the lens holding cylinder 6 moves up and down accordingly. The objective lens 11 is configured to move and rotate to focus a light beam onto a track of a disk (not shown).
そして、この時、外側ヨーク１９ａ，１９ｂの
内面がフオーカス動作用コイル１３に協力近づい
ているため磁気回路に強い磁力が発生しレンズ保
持筒６に大きな上下動作、即ち円滑な焦点合せ動
作を実行させることができる。 At this time, since the inner surfaces of the outer yokes 19a and 19b approach the focus operation coil 13, a strong magnetic force is generated in the magnetic circuit, causing the lens holding cylinder 6 to perform a large vertical movement, that is, a smooth focusing operation. be able to.
＜本考案の効果＞
本考案は叙上のように構成されるものでるか
ら、装置の小型化が計れると共に磁気回路に大き
な磁力を発生させることができる優れた考案であ
る。<Effects of the present invention> Since the present invention is constructed as described above, it is an excellent invention that can reduce the size of the device and generate a large magnetic force in the magnetic circuit.
第１図、第２図及び第５図は本考案に係る対物
レンズ装置の一実施例を示す斜視図、平面図及び
分解斜視図、第３図及び第４図は上記第２図のＡ
−A′線及びＢ−B′線断面図である。
１……ベース本体、４ａ，４ｂ……マグネツ
ト、５ａ，５ｂ……内側ヨーク、６……レンズ保
持筒、１１……対物レンズ、１３……フオーカス
動作用コイル、１４……トラツキング動作用コイ
ル、１９ａ，１９ｂ……外側ヨーク、２０a1，２
０a2，２０b1，２０b2……切欠き。
1, 2, and 5 are a perspective view, a plan view, and an exploded perspective view showing one embodiment of the objective lens device according to the present invention, and FIGS. 3 and 4 are A of the above-mentioned FIG. 2.
-A' line and BB' line sectional views. DESCRIPTION OF SYMBOLS 1... Base body, 4a, 4b... Magnet, 5a, 5b... Inner yoke, 6... Lens holding tube, 11... Objective lens, 13... Focus operation coil, 14... Tracking operation coil, 19a, 19b...outer yoke, 20a 1 , 2
0a 2 , 20b 1 , 20b 2 ...notch.
Claims (1)
持筒を回動かつ上下動自在に支持すると共にレン
ズ保持筒の外周側面にフオーカス動作用コイル及
びトラツキング動作用コイルを後者を外側にして
固着し、かつ、上記ベース体上には上記各コイル
と共に磁気回路を形成するヨークとマグネツトを
設けたものにおいて、上記レンズ保持筒の外側に
設けられた外側ヨークの内側面に上記トラツキン
グ動作用コイルを避ける切欠きを設けたことを特
徴とする対物レンズ装置。 A lens holding tube holding an objective lens is rotatably and vertically movably supported on the base body, and a focusing operation coil and a tracking operation coil are fixed to the outer peripheral side of the lens holding tube with the latter on the outside, and A yoke and a magnet are provided on the base body to form a magnetic circuit together with each of the coils, and a notch is provided on the inner surface of the outer yoke provided on the outside of the lens holding tube to avoid the tracking operation coil. An objective lens device comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19470484U JPH048483Y2 (en) | 1984-12-20 | 1984-12-20 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19470484U JPH048483Y2 (en) | 1984-12-20 | 1984-12-20 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61111033U JPS61111033U (en) | 1986-07-14 |
| JPH048483Y2 true JPH048483Y2 (en) | 1992-03-04 |
Family
ID=30752162
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19470484U Expired JPH048483Y2 (en) | 1984-12-20 | 1984-12-20 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH048483Y2 (en) |
-
1984
- 1984-12-20 JP JP19470484U patent/JPH048483Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61111033U (en) | 1986-07-14 |
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