JPH01162243A - Optical beam focusing device - Google Patents
Optical beam focusing deviceInfo
- Publication number
- JPH01162243A JPH01162243A JP62322433A JP32243387A JPH01162243A JP H01162243 A JPH01162243 A JP H01162243A JP 62322433 A JP62322433 A JP 62322433A JP 32243387 A JP32243387 A JP 32243387A JP H01162243 A JPH01162243 A JP H01162243A
- Authority
- JP
- Japan
- Prior art keywords
- light beam
- light
- reflecting mirror
- reflecting
- focusing device
- 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 description 4
- 230000000694 effects Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、情報ディスクに光ビームを集束させる装置に
関する。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a device for focusing a light beam onto an information disc.
従来の技術
］ンパクトディスク等情報ディスクの光ピツクアップす
なわち、情報読み取シ装置は、近年非常に小型化、薄型
化の傾向にある。そのため光ビーム集光装置の光学構成
は、第４図、第５図に示すように、情報ディスク７に水
平に放出した光ビームを反射ミラー６によって情報ディ
スク７に垂直に方向転換させるような構造をとるものが
一般的である。2. Description of the Related Art In recent years, optical pickup devices for information disks such as compact disks, that is, information reading devices, have been becoming much smaller and thinner. Therefore, the optical configuration of the light beam focusing device is such that the light beam emitted horizontally to the information disk 7 is directed perpendicularly to the information disk 7 by the reflecting mirror 6, as shown in FIGS. 4 and 5. It is common to take
従来の光ビーム集光装置は、第４図、第５図に示すよう
に半導体レーザー等の光源よシ放出する拡散光である光
ビームをコリメートレンズ４によ）で−度平行光に直し
、反射ミラー５によって、情報ディスク７に垂直に方向
転換させ、対物レンズ６によって平行光を集束光とし、
情報ディスク７の記録面に集束させていた。この際、コ
リメートレンズ４を反射ミラー６の後に設置し、拡散光
である光ビームを反射ミラー６によって情報ディスク７
に垂直に方向転換させた後、コリメートレンズ４によ】
て平行光に直し、その後対物レンズに入光させる場合も
あ及うる〇
発明が解決しようとする問題点
しかしなから、以上のような従来構成の場合、コリメー
トレンズ４が反射ミラー６の前後どちらかに必要であり
、小型化、薄型化を図る上で障害となっていた。また、
部品点数もコリメートレンズの分だけ多くなっていた。As shown in FIGS. 4 and 5, the conventional light beam focusing device converts a light beam, which is diffused light emitted from a light source such as a semiconductor laser, into a - degree parallel light using a collimating lens 4). The reflecting mirror 5 changes the direction perpendicular to the information disk 7, and the objective lens 6 converts the parallel light into a focused light.
It was focused on the recording surface of the information disk 7. At this time, a collimating lens 4 is installed after the reflecting mirror 6, and the light beam, which is diffused light, is directed to the information disk 7 by the reflecting mirror 6.
After changing the direction perpendicular to the collimating lens 4]
However, in the case of the conventional configuration as described above, the collimating lens 4 is either in front of or behind the reflecting mirror 6. This was an obstacle to miniaturization and thinning. Also,
The number of parts also increased due to the collimating lens.
問題点を解決するための手段
かかる問題を解決するために、本発明においては前記反
射ミラーに前記コリメートレンズの性質をもたせ、即わ
ち、拡散光である光ビームを平行光は直すと同時に前記
情報ディスクに垂直に方向転換させるものである。Means for Solving the Problems In order to solve the problems, in the present invention, the reflecting mirror has the properties of the collimating lens, that is, it corrects the light beam which is the diffused light beam, and at the same time corrects the parallel light beam. It changes the direction perpendicular to the information disc.
作 用
本発明はかかる手段によシ、拡散光である光ビームを平
行光に直すためのコリメートレンズを廃止でき、情報読
み取シ装置の小型化、薄型化を可能とし、かつ光学部品
を１点削減することを可能とするものである。By using such a means, the present invention can eliminate the need for a collimating lens for converting a diffused light beam into parallel light, make the information reading device smaller and thinner, and reduce the number of optical components to one. This makes it possible to reduce
実施例
本発明の一実施例を図面を基に説明する。第１図に示す
のがその斜視図である。ここで座標系は、情報ディスク
３に平行な平面内において、光源よシ放出した光ビーム
の進行方向をＸ軸、それと垂直な方向をｙ軸、そして情
報ディスク３に垂直な方向を２軸としている。Embodiment An embodiment of the present invention will be explained based on the drawings. What is shown in FIG. 1 is a perspective view thereof. Here, the coordinate system is in a plane parallel to the information disk 3, with the traveling direction of the light beam emitted from the light source as the There is.
光源よシ放出した拡散光である光ビームは、反射ミラー
１の反射面１ａによって、ｚ軸方向に方向転換すると共
に、平行光となシ、対物レンズ２に入光し、情報ディス
ク３に集束する。以上の内容を！２平面及びＩｙ平面に
て説明したものが各々第２図、第３図である。その作用
は第１図の場合と同様なので説明は省略する。The light beam, which is diffused light emitted from the light source, is changed in direction in the z-axis direction by the reflective surface 1a of the reflective mirror 1, and is then converted into parallel light, enters the objective lens 2, and is focused on the information disk 3. do. More than that! FIGS. 2 and 3 are illustrations of the two planes and the Iy plane, respectively. The operation is the same as that shown in FIG. 1, so the explanation will be omitted.
発明の効果
以上の実施例よシ明らかなように、本発明によれば、コ
リメートレンズを廃止でき、情報読み取シ装置の小型化
、薄型化の効果を奏することができる。Effects of the Invention As is clear from the above embodiments, according to the present invention, the collimating lens can be eliminated, and the information reading device can be made smaller and thinner.
第１図は本発明の実施例の光ビーム集束装置の斜視図、
第２図は同側面図、第３図は同平面図、第４図は従来例
の斜視図、第５図は同側面図である。
１・・・・・・反射ミラー、１ａ・・・・・・反射面、
２・・・・・・対物レンズ、３・・・・・・情報ディス
ク。
代理人の氏名 弁理士 中 尾 敏 男 ほか１名／−
−−及身↑ミラー
２−−一肘物レンズ
Ｊ−−ノｌｔ報テンスク
第 １ 図
第２図
第４図
第５図FIG. 1 is a perspective view of a light beam focusing device according to an embodiment of the present invention;
2 is a side view of the same, FIG. 3 is a plan view of the same, FIG. 4 is a perspective view of the conventional example, and FIG. 5 is a side view of the same. 1...Reflection mirror, 1a...Reflection surface,
2...Objective lens, 3...Information disk. Name of agent: Patent attorney Toshio Nakao and 1 other person/-
--Body↑Mirror 2--One-piece lens J--Nolt report No. 1 Figure 2 Figure 4 Figure 5
Claims (1)
を平行光にさせるような反射面形状を有する反射ミラー
と、前記反射ミラーによって平行光となった前記光ビー
ムを情報ディスク上に集束させる対物レンズを有するこ
とを特徴とする光ビーム集束装置。a reflecting mirror having a reflecting surface shape that reflects a light beam that is diffused light and converts the light beam into parallel light after reflection; and a reflecting mirror that focuses the light beam that has become parallel light onto an information disk. A light beam focusing device comprising an objective lens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62322433A JPH01162243A (en) | 1987-12-18 | 1987-12-18 | Optical beam focusing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62322433A JPH01162243A (en) | 1987-12-18 | 1987-12-18 | Optical beam focusing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01162243A true JPH01162243A (en) | 1989-06-26 |
Family
ID=18143617
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62322433A Pending JPH01162243A (en) | 1987-12-18 | 1987-12-18 | Optical beam focusing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01162243A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5237557A (en) * | 1990-06-29 | 1993-08-17 | Kabushiki Kaisha Toshiba | Optical head having improved reflecting assembly |
-
1987
- 1987-12-18 JP JP62322433A patent/JPH01162243A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5237557A (en) * | 1990-06-29 | 1993-08-17 | Kabushiki Kaisha Toshiba | Optical head having improved reflecting assembly |
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