JPS6161241A - Focus controlling device - Google Patents
Focus controlling deviceInfo
- Publication number
- JPS6161241A JPS6161241A JP18401584A JP18401584A JPS6161241A JP S6161241 A JPS6161241 A JP S6161241A JP 18401584 A JP18401584 A JP 18401584A JP 18401584 A JP18401584 A JP 18401584A JP S6161241 A JPS6161241 A JP S6161241A
- Authority
- JP
- Japan
- Prior art keywords
- focus
- spherical lens
- lens
- detector
- disk
- 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
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
- G11B7/0908—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 for focusing only
Landscapes
- Automatic Focus Adjustment (AREA)
- Optical Recording Or Reproduction (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明はディスクプレーヤ等の光学式情報記録再生装置
におけるフォーカス制御装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a focus control device in an optical information recording/reproducing device such as a disc player.
従来例の構成とその問題点
現在の光デイスク装置のフォーカシング制御は、ジャス
トフォーカス時にディスクからの反射光を絞りレンズで
平行光に変換し、その平行光をフォーカス検出装置に入
射するように構成されている。Conventional configuration and its problems The focusing control of current optical disk devices is configured such that when just focusing, the reflected light from the disk is converted into parallel light by an aperture lens, and the parallel light is incident on the focus detection device. ing.
つまシ、平行光を凸レンズにてフォーカスディテクター
上に絞シ込むのであシ、その時、凸レンズの焦点距離の
位置にフォーカスディテクターを調整する必要がある。Since the collimated light is focused onto the focus detector using a convex lens, it is necessary to adjust the focus detector to the focal length of the convex lens.
この調整がくるうと、フォーカス検出感度が悪くなる。If this adjustment continues, focus detection sensitivity will deteriorate.
また、この調整に加えてフォーカスディテクター位置の
調整がある。したがって、実際とは調整に時間を費やし
、凸レンズの焦点距離にフォーカスディテクターをもっ
てくる調整が甘くなっており、フォーカス検出感度が悪
くなるという欠点を有していた。In addition to this adjustment, there is also adjustment of the focus detector position. Therefore, in practice, it takes time to make adjustments, and the adjustment to bring the focus detector to the focal length of the convex lens is not easy, resulting in poor focus detection sensitivity.
発明の目的
本発明は、焦点距離の調整が不用になり、しかもフォー
カス検出感度をも向上させることができるフォーカス制
御装置を提供することを目的とする。OBJECTS OF THE INVENTION An object of the present invention is to provide a focus control device that does not require focal length adjustment and can also improve focus detection sensitivity.
発明の構成
本発明のフォーカス制御装置は、ディスクからの反射光
を球状レンズに入射させ、その球状レンズの出射位置に
フォーカスディテクターを設けたものである。かかる構
成によれば、ジャストフォーカス時に球状レンズ上に焦
点を結ぶという原理を利用してレンズとフォーカスディ
テクター間の距離の調整を無くすることができる利点を
有する。Structure of the Invention The focus control device of the present invention allows reflected light from a disk to enter a spherical lens, and a focus detector is provided at the exit position of the spherical lens. This configuration has the advantage of eliminating the need to adjust the distance between the lens and the focus detector by utilizing the principle of focusing on the spherical lens during just focusing.
実施例の説明
図に本発明の一実施例を示す。図において、１は光デイ
スク装置のディスクを示しこのディスク１からの反射光
を絞シレンズ２で、ジャストフォーカスであれば平行光
にする。その反射光は方向変換ミラー３で方向を変え、
ミラー４によって光量を２分割し、焦点検出装置と溝検
出装置に入射される。つまシ、２分割された一方を溝検
出ディテクター５側に導き、もう一方を焦点検出ディテ
クター７に導く。その時、球状レンズ６を介して入射さ
せる。ディスク１と絞シレンズ２がジャストフォーカス
されていれば、絞りレンズ２からの出射光は平行光とな
シ、球状レンズ６に入射される。すると、球状レンズ６
の表面上で焦点を結ぶようになる。球状レンズ６の出射
位置である焦点位置にはフォーカスディテクター７を設
定しであるので、球状レンズ６の焦点距離の調整は不用
になシ、しかも高いフォーカス検出感度を持ったフォー
カス検出装置を実現することができる。An embodiment of the present invention is shown in the explanatory diagram of the embodiment. In the figure, reference numeral 1 denotes a disk of an optical disk device, and the reflected light from the disk 1 is converted into parallel light by an aperture lens 2 if the focus is just right. The reflected light changes direction with the direction conversion mirror 3,
The amount of light is divided into two by the mirror 4, and is incident on the focus detection device and the groove detection device. The tab is divided into two parts, one of which is guided to the groove detection detector 5 side, and the other part is guided to the focus detection detector 7. At that time, the light is made to enter through the spherical lens 6. If the disk 1 and the aperture lens 2 are in just focus, the light emitted from the aperture lens 2 becomes parallel light and enters the spherical lens 6. Then, the spherical lens 6
Becomes focused on the surface. Since the focus detector 7 is set at the focal position, which is the exit position of the spherical lens 6, there is no need to adjust the focal length of the spherical lens 6, and a focus detection device with high focus detection sensitivity is realized. be able to.
発明の効果
以上のように本発明によれば、従来まで絶対に調整の必
要であったフォーカスディテクターと凸レンズの距離の
調整を不用にし、しかもフォーカス検出感度を向上させ
ることができる。また製品間のフォーカス検出感度のバ
ラツキもなくなり、調整の簡素化とともに性能の向上を
得ることができる利点を有する。Effects of the Invention As described above, according to the present invention, it is possible to eliminate the need to adjust the distance between the focus detector and the convex lens, which was absolutely necessary in the past, and to improve focus detection sensitivity. Furthermore, variations in focus detection sensitivity between products are eliminated, which has the advantage of simplifying adjustment and improving performance.
図１ｆ本発明の一実施例を示すフォーカス制御装置の要
部構成図である。
１・・・・・・ディスク、２・・・・・・絞シレンズ、
６・・・・・・球状レンズ、７・・・・・・フォーカス
ディテクタ。FIG. 1F is a main part configuration diagram of a focus control device showing an embodiment of the present invention. 1...Disc, 2...Aperture lens,
6... Spherical lens, 7... Focus detector.
Claims (1)
状レンズの出射位置にフォーカスディテクターを設けた
ことを特徴とするフォーカス制御装置。1. A focus control device, characterized in that reflected light from a disk is made incident on a spherical lens, and a focus detector is provided at an output position of the spherical lens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18401584A JPS6161241A (en) | 1984-09-03 | 1984-09-03 | Focus controlling device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18401584A JPS6161241A (en) | 1984-09-03 | 1984-09-03 | Focus controlling device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6161241A true JPS6161241A (en) | 1986-03-29 |
Family
ID=16145840
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18401584A Pending JPS6161241A (en) | 1984-09-03 | 1984-09-03 | Focus controlling device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6161241A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05144036A (en) * | 1991-11-25 | 1993-06-11 | Mitsubishi Electric Corp | Objective lens drive device |
-
1984
- 1984-09-03 JP JP18401584A patent/JPS6161241A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05144036A (en) * | 1991-11-25 | 1993-06-11 | Mitsubishi Electric Corp | Objective lens drive device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US3947093A (en) | Optical device for producing a minute light beam | |
| JP2000199808A (en) | Lens and optical device using the same | |
| JPS6161241A (en) | Focus controlling device | |
| JPS56163531A (en) | Optical information recorder and reproducer | |
| JPS57172306A (en) | Focus controller of optical recording system | |
| JPS56156937A (en) | Optical pickup device | |
| JP2838441B2 (en) | Optoelectronics recording device | |
| JP2904422B2 (en) | Light head | |
| JPS62173650A (en) | Optical information reproducing device | |
| JPH0731373Y2 (en) | Optical pickup device | |
| JPS567245A (en) | Automatic focusing unit in optical information reproducing device | |
| JPS63204523A (en) | Optical head device | |
| JPS58208945A (en) | Method and apparatus for detecting focus | |
| JP2735137B2 (en) | Optical system of optical information recording / reproducing device | |
| JPH02189733A (en) | Optical head | |
| JPS6489040A (en) | Focus controller | |
| JPS573234A (en) | Optical recorder and reproducer | |
| JPS55129940A (en) | Optical type reproducing device | |
| JPS5611629A (en) | Focus detector for optical information reproducing unit | |
| JPS54108602A (en) | Optical reproducer | |
| JPH04205824A (en) | Optical pick-up device | |
| JPS57100636A (en) | Optical information reader | |
| JPS647338A (en) | Focus controller | |
| JPH0414630A (en) | Disk signal detector | |
| JPH0644353B2 (en) | Optical pickup device |