JPH03168937A - Objective lens for optical disk device - Google Patents
Objective lens for optical disk deviceInfo
- Publication number
- JPH03168937A JPH03168937A JP1307910A JP30791089A JPH03168937A JP H03168937 A JPH03168937 A JP H03168937A JP 1307910 A JP1307910 A JP 1307910A JP 30791089 A JP30791089 A JP 30791089A JP H03168937 A JPH03168937 A JP H03168937A
- Authority
- JP
- Japan
- Prior art keywords
- objective lens
- optical
- lens
- collar
- optical axis
- 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.)
- Granted
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 60
- 230000002093 peripheral effect Effects 0.000 claims abstract description 6
- 239000000463 material Substances 0.000 abstract description 6
- 239000000758 substrate Substances 0.000 abstract description 4
- 229910000420 cerium oxide Inorganic materials 0.000 abstract description 2
- ORUIBWPALBXDOA-UHFFFAOYSA-L magnesium fluoride Chemical compound [F-].[F-].[Mg+2] ORUIBWPALBXDOA-UHFFFAOYSA-L 0.000 abstract description 2
- 229910001635 magnesium fluoride Inorganic materials 0.000 abstract description 2
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 abstract description 2
- 238000002310 reflectometry Methods 0.000 abstract 2
- 238000000151 deposition Methods 0.000 abstract 1
- 230000008020 evaporation Effects 0.000 abstract 1
- 238000001704 evaporation Methods 0.000 abstract 1
- 229910052755 nonmetal Inorganic materials 0.000 abstract 1
- 150000002843 nonmetals Chemical class 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 206010010071 Coma Diseases 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 201000009310 astigmatism Diseases 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔概 要〕
光ディスク装置の光学ヘッドに用いられる対物レンズに
関し、
光学ヘッドに対物レンズを装着する場合の光軸の傾き調
整が容易な対物レンズの提供を目的とし、光ディスク装
置の光学ヘッドに用いられる対物レンズの光軸に対して
直交する平面を有する鍔を前記対物レンズの周縁部に一
体的に設け、前記鍔の平面に光の反射膜を形成して構成
する。[Detailed Description of the Invention] [Summary] Regarding an objective lens used in an optical head of an optical disc device, the objective lens is to provide an objective lens that allows easy adjustment of the inclination of the optical axis when the objective lens is attached to the optical head. A flange having a plane perpendicular to the optical axis of an objective lens used in an optical head of the apparatus is integrally provided on the peripheral edge of the objective lens, and a light reflecting film is formed on the plane of the flange.
本発明は、光ディスク装置用対物レンズに関する．
光ディスク装置の光学ヘッド内における対物レンズは、
その光軸を常に光ディスクの記録面に対して精度よく垂
直に保持されながらトランキング駆動およびフォーカシ
ング駆動される。もし光ディスクの記録面に対する光軸
の傾きが大きくなると光学的収差（非点収差やコマ収差
等）が発生して各種の情報信号に乱れが生じるため、精
度よく保持するように取付け位置が調整できる手段の開
発が望まれている。The present invention relates to an objective lens for an optical disc device. The objective lens in the optical head of an optical disk device is
Trunking drive and focusing drive are performed while the optical axis is always held precisely perpendicular to the recording surface of the optical disk. If the inclination of the optical axis with respect to the recording surface of the optical disc becomes large, optical aberrations (astigmatism, coma, etc.) will occur and various information signals will be disturbed, so the mounting position can be adjusted to maintain precision. Development of a means is desired.
第２図は従来の光ディスク装置内における光ディスクと
対物レンズとの相対位置を示す図である．以下構成、動
作の説明を理解し易くするために全図を通じて同一部分
には同一符号を付してその重複説明を省略する。図にお
いて、ｌは光ディスク装置の光学ヘッドに用いられる対
物レンズ、２は光ディスク、３は対物レンズの光軸を示
す。対物レンズｌは光ディスク装置に装着された光学ヘ
ッド内に取付けられた状態において、光ディスク２の記
録面に対してその光軸３が精度よく垂直を保持するよう
に光学測定器を利用して取付位置の調整を行う．
第３図は従来の代表的な対物レンズの断面図を示す．図
において、４は対物レンズのレンズ部、５は対物レンズ
１の光軸３に対して直交する平面を有する鍔であってレ
ンズ部４周縁部に同心円状に所要の厚みをもって一体的
に設けられている。FIG. 2 is a diagram showing the relative positions of an optical disk and an objective lens in a conventional optical disk device. In order to make the explanation of the configuration and operation easier to understand, the same parts are given the same reference numerals throughout the drawings, and their repeated explanation will be omitted. In the figure, l indicates an objective lens used in an optical head of an optical disc device, 2 indicates an optical disc, and 3 indicates an optical axis of the objective lens. When the objective lens l is installed in the optical head installed in the optical disc device, the mounting position is determined using an optical measuring device so that its optical axis 3 is precisely perpendicular to the recording surface of the optical disc 2. Make adjustments. Figure 3 shows a cross-sectional view of a typical conventional objective lens. In the figure, 4 is a lens part of the objective lens, and 5 is a flange having a plane perpendicular to the optical axis 3 of the objective lens 1, which is integrally provided concentrically around the periphery of the lens part 4 with a required thickness. ing.
６は鍔５の傾きを調整可能に支える支持部材であって光
学ヘッド７を構戒する部材の一部分である。Reference numeral 6 denotes a support member that supports the collar 5 so that its inclination can be adjusted, and is a part of the member that guards the optical head 7.
対物レンズ１はモールド形成されたものが多く、光軸３
と鍔５の平面部はかなりの精度で垂直度が保証されてい
る．
第４図は従来の対物レンズの傾きを測定する方法の説明
図である．図において８は光ディスク装置内の光学ヘッ
ド取付基準面（ガイドレール等）であって、測定に際し
ては光ディスク２を取り除き、光学ヘッド取付基準面の
所定位置に配置した光学ヘッド７に装着された対物レン
ズ１の直上にオートコリメータ９を位置決めする．
オートコリメータ９は自ら平行光を射出して測定対象物
である対物レンズ１の鍔５からの反射光を検知して鍔５
の傾き角を測定する装置である。The objective lens 1 is often molded, and the optical axis 3
The perpendicularity of the flat part of the tsuba 5 is guaranteed with considerable accuracy. Figure 4 is an explanatory diagram of a conventional method for measuring the tilt of an objective lens. In the figure, reference numeral 8 denotes the optical head mounting reference surface (guide rail, etc.) in the optical disk device, and during measurement, the optical disk 2 is removed and the objective lens attached to the optical head 7 is placed at a predetermined position on the optical head mounting reference surface. Position autocollimator 9 directly above 1. The autocollimator 9 emits parallel light by itself and detects the reflected light from the flange 5 of the objective lens 1 which is the object to be measured.
This is a device that measures the angle of inclination.
オートコリメータ９から光学ヘッド取付基準面８に対し
て垂直方向の平行光を対物レンズ１に照射し、対物レン
ズ１に設けられた鍔５からの反射光を観測することによ
り、光学ヘッド取付基準面８に対する鍔５の平面部の傾
きの測定を行う。By irradiating the objective lens 1 with parallel light perpendicular to the optical head mounting reference surface 8 from the autocollimator 9 and observing the reflected light from the flange 5 provided on the objective lens 1, the optical head mounting reference surface is determined. The inclination of the flat part of the collar 5 with respect to the angle 8 is measured.
測定方法の詳細は朝倉書店１９８４年８月５日発行の「
光学的測定ハンドブック」著者：田幸敏治・他２名に記
載されているので省略するが、マイクロメータ等を併用
すると高精度の傾き角の測定が容易に行えるから、この
オートコリメー夕を利用して光学ヘッドに対する対物レ
ンズ１の位置決め調節を行なっていた．
〔発明が解決しようとする課題〕
従来の一対物レンズ１の外形は一般にレンズ部の直径が
約３−、鍔の直径が約５ｍｌｌＩ程度でオートコリメー
夕は鍔の平面部の面積と、その平面部の反射率（従来は
約５％程度）に依存する反射光を検出して傾きの測定を
行うものである．近時光学ヘッドの小型化、すなわち対
物レンズの小型化の強い要望があり、レンズ部の直径を
約１＋＋ｎにする可能性の検討が進められている．とこ
ろがレンズ部の直径の小型化に鍔の直径の小型化が伴う
ため鍔の平面部の面積が小さくなる結果、オートコリメ
ー夕が検出する反射光の光度が検出可能限界を下回るこ
とになり、オートコリメータの機能が働かなくなり、対
物レンズの傾き＃Ｊｊ４節が困難になるという問題点が
ある．
本発明は上記従来の問題点に鑑みて創作されたもので、
光学ヘッドに対物レンズを装着する場合の光軸の傾き調
整が容易な対物レンズの提供を目的とする．
〔課題を解決するための手段〕
第１図は本発明の対物レンズの外観図である．光ディス
ク装置の光学ヘッドに用いられる対物レンズｌの光軸に
対して直交する平面を有する鍔５を前記対物レンズｌの
周縁部に一体的に設け、前記鍔５の平面に光の反射膜ｌ
Ｏを形成して構成する。For details on the measurement method, please refer to the Asakura Shoten publication August 5, 1984.
I will not omit it because it is described in "Optical Measurement Handbook" by Toshiharu Tako and two others, but since it is easy to measure the tilt angle with high precision when used in conjunction with a micrometer, etc., optical measurement using this autocollimator is possible. The positioning of objective lens 1 relative to the head was being adjusted. [Problems to be Solved by the Invention] Generally, the outer diameter of the conventional objective lens 1 is approximately 3 mm in diameter at the lens portion, and approximately 5 mm in diameter at the flange, and the autocollimator has an area of the flat portion of the flange and the diameter of the flange. The inclination is measured by detecting the reflected light that depends on the reflectance (previously about 5%). Recently, there has been a strong demand for miniaturization of optical heads, that is, miniaturization of objective lenses, and studies are underway on the possibility of reducing the diameter of the lens portion to approximately 1++n. However, as the lens diameter becomes smaller, the diameter of the tsuba also becomes smaller, and as a result, the area of the flat part of the tsuba becomes smaller, and as a result, the luminous intensity of the reflected light detected by the autocollimator falls below the detectable limit. The problem is that the function no longer works, making it difficult to tilt the objective lens #Jj4. The present invention was created in view of the above-mentioned conventional problems.
The objective is to provide an objective lens that allows easy adjustment of the optical axis inclination when attaching the objective lens to an optical head. [Means for Solving the Problems] Figure 1 is an external view of the objective lens of the present invention. A flange 5 having a plane perpendicular to the optical axis of an objective lens 1 used in an optical head of an optical disk device is integrally provided on the peripheral edge of the objective lens 1, and a light reflecting film 1 is provided on the plane of the flange 5.
Form and configure O.
対物レンズ１の光軸に対して直交する平面を有する鍔５
を前閾対物レンズ１の周縁部に一体的に設け、前記鍔５
の平面に光の反射膜１０を形戒することにより反射率を
向上させ、オートコリメー夕が前記反射膜１０から受け
る反射光量を増加させることにより光軸の傾き測定を容
易にすることができる．
〔実施例〕
以下本発明の実施例を図面によって詳述する。Tsuba 5 having a plane perpendicular to the optical axis of the objective lens 1
is integrally provided on the periphery of the front threshold objective lens 1, and the flange 5
By forming a light reflecting film 10 on the plane of the optical axis, the reflectance can be improved, and by increasing the amount of reflected light that the autocollimator receives from the reflecting film 10, it is possible to easily measure the inclination of the optical axis. [Examples] Examples of the present invention will be described in detail below with reference to the drawings.
第１図は本発明の対物レンズの外観図であって、第１図
（ａｌは平面図、第１図（ｂ）は側面断面図を示す．両
図において、■は対物レンズであってレンズ部４と、レ
ンズ部４の光軸３に対して直交する平面を有しレンズ部
４の周縁部に一体的に設けられた鍔５と、その鍔５の平
面部に形成された反射膜１０とから構戒されている。反
射膜１０の反射率は高い程好まし＜、１００％に近い反
射率を得るためには例えば非金属の多層蒸着膜（誘電体
多層蒸着膜）が使用される。これは光学材料の研磨面を
基板として、その表面に基板材料の屈折率ｎｓ（例えば
１．５１）よりも高い屈折率ｎ．の物質（例えば酸化セ
リウム〉と、低い屈折率ｎｔＯ物Ｘ（例えば弗化マグネ
シウム）を光学的な厚さ（屈折率と厚さの積）が１／４
波長になるように交互に重ねて蒸着したものが知られて
いる。FIG. 1 is an external view of the objective lens of the present invention, and FIG. part 4, a flange 5 having a plane orthogonal to the optical axis 3 of the lens part 4 and integrally provided on the peripheral edge of the lens part 4, and a reflective film 10 formed on the plane part of the flange 5. The higher the reflectance of the reflective film 10, the better. In order to obtain a reflectance close to 100%, for example, a non-metallic multilayer deposited film (dielectric multilayer deposited film) is used. This uses a polished surface of an optical material as a substrate, and a substance with a refractive index n higher than the refractive index ns (for example 1.51) of the substrate material (for example, cerium oxide) and a substance X with a low refractive index ntO ( For example, magnesium fluoride) has an optical thickness (product of refractive index and thickness) of 1/4.
It is known that the layers are alternately deposited to match the wavelength.
鍔５の平面部の減少率が少ない場合は、安価なアルミ膜
の蒸着形戒でも目的を達威することができる．
〔発明の効果〕
以上の説明から明らかなように本発明によれば、対物レ
ンズの外形が小型化しレンズ鍔の平面部の面積が小さく
なっても、反射光量を十分確保することが可能になるた
め、オートコリメー夕等を使用してのレンズ光軸の傾き
の検出が可能となり光ディスク装置の組立性向上に寄与
するところが大きい。If the reduction rate of the flat part of the tsuba 5 is small, the purpose can be achieved even with an inexpensive vapor-deposited aluminum film. [Effects of the Invention] As is clear from the above description, according to the present invention, even if the outer shape of the objective lens becomes smaller and the area of the flat part of the lens flange becomes smaller, a sufficient amount of reflected light can be ensured. Therefore, the inclination of the lens optical axis can be detected using an autocollimator or the like, which greatly contributes to improving the ease of assembling the optical disc device.
第１図は本発明の対物レンズの外観図、第２図は従来の
光ディスク装置内における光ディスクと対物レンズの相
対位置を示す図、第３図は従来の代表的な対物レンズの
断面図、第４図は従来の対物レンズの傾きを測定する方
法の説明図を示す。
第１図において、■は対物レンズ、５は鍔、１０は反射
膜をそれぞれ示す。
Ｎ２８
３疋来のべ夛嗅〜ｆｉた神勢レソズのｌ乍め図第３閃
イざ｝タミｆ）Ｍｆｉ＄Ｄレンス゛の何比？ジ則庭〕ず
るろ冫天の名先朗図第４図FIG. 1 is an external view of the objective lens of the present invention, FIG. 2 is a diagram showing the relative position of an optical disk and an objective lens in a conventional optical disk device, and FIG. 3 is a sectional view of a typical conventional objective lens. FIG. 4 shows an explanatory diagram of a conventional method for measuring the tilt of an objective lens. In FIG. 1, ■ indicates an objective lens, 5 indicates a collar, and 10 indicates a reflective film. N28 3. What is the ratio of Mfi$D Lens? Ji Noritei] Zururo Chiten's Meisenrozu Figure 4
Claims (1)
１）の光軸に対して直交する平面を有する鍔（５）を前
記対物レンズの周縁部に一体的に設け、前記鍔（５）の
平面に光の反射膜（１０）を形成したことを特徴とする
光ディスク装置用対物レンズ。Objective lens (
A flange (5) having a plane perpendicular to the optical axis of 1) is integrally provided on the peripheral edge of the objective lens, and a light reflecting film (10) is formed on the plane of the flange (5). Characteristic objective lens for optical disc devices.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1307910A JP2757504B2 (en) | 1989-11-27 | 1989-11-27 | lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1307910A JP2757504B2 (en) | 1989-11-27 | 1989-11-27 | lens |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03168937A true JPH03168937A (en) | 1991-07-22 |
| JP2757504B2 JP2757504B2 (en) | 1998-05-25 |
Family
ID=17974644
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1307910A Expired - Fee Related JP2757504B2 (en) | 1989-11-27 | 1989-11-27 | lens |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2757504B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017040791A (en) * | 2015-08-20 | 2017-02-23 | 株式会社ダイセル | Optical component and optical device including the same |
| JP2018013786A (en) * | 2017-08-03 | 2018-01-25 | 株式会社ダイセル | Optical component and optical device including the same |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60214431A (en) * | 1984-04-10 | 1985-10-26 | Toshiba Corp | Detector of lens position |
| JPS6176401U (en) * | 1984-10-24 | 1986-05-22 | ||
| JPS6446241A (en) * | 1987-04-17 | 1989-02-20 | Alps Electric Co Ltd | Method for fitting objective lens to optical pickup, optical pickup mounted with objective lens and objective lens to optical pickup |
-
1989
- 1989-11-27 JP JP1307910A patent/JP2757504B2/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60214431A (en) * | 1984-04-10 | 1985-10-26 | Toshiba Corp | Detector of lens position |
| JPS6176401U (en) * | 1984-10-24 | 1986-05-22 | ||
| JPS6446241A (en) * | 1987-04-17 | 1989-02-20 | Alps Electric Co Ltd | Method for fitting objective lens to optical pickup, optical pickup mounted with objective lens and objective lens to optical pickup |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017040791A (en) * | 2015-08-20 | 2017-02-23 | 株式会社ダイセル | Optical component and optical device including the same |
| CN114879286A (en) * | 2015-08-20 | 2022-08-09 | 株式会社大赛璐 | Optical member and optical device provided with same |
| JP2018013786A (en) * | 2017-08-03 | 2018-01-25 | 株式会社ダイセル | Optical component and optical device including the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2757504B2 (en) | 1998-05-25 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |