JPH0318256B2 - - Google Patents
Info
- Publication number
- JPH0318256B2 JPH0318256B2 JP58046276A JP4627683A JPH0318256B2 JP H0318256 B2 JPH0318256 B2 JP H0318256B2 JP 58046276 A JP58046276 A JP 58046276A JP 4627683 A JP4627683 A JP 4627683A JP H0318256 B2 JPH0318256 B2 JP H0318256B2
- Authority
- JP
- Japan
- Prior art keywords
- light
- optical
- half mirror
- recording
- reflected
- 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 - Lifetime
Links
- 230000003287 optical effect Effects 0.000 claims description 31
- 230000031700 light absorption Effects 0.000 description 14
- 239000004065 semiconductor Substances 0.000 description 7
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
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
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
Landscapes
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Head (AREA)
- Optical Elements Other Than Lenses (AREA)
Description
【発明の詳細な説明】
産業上の利用分野
本発明は光学的に情報を記録もしくは再生する
機器を含むシステムすべてに利用できるものであ
り、例えばコンピユータ外部メモリ、ビデオ、オ
ーデイオ録再システム等に適用して価値の高い光
学記録再生装置に関するものである。[Detailed Description of the Invention] Industrial Application Field The present invention can be used in all systems including equipment that optically records or reproduces information, and is applied to, for example, computer external memory, video, audio recording and reproducing systems, etc. This invention relates to an optical recording and reproducing device that is highly valuable.
従来例の構成とその問題点
第１図に従来例の構成を示す。第１図において
１は半導体レーザ、２はコリメートレンズ、３は
ハーフミラー、４は対物レンズ、５は記録媒体、
６は対物レンズアクチユエータ、７は凸レンズ、
８は光検出器、９は光学ブロツクである。光学ブ
ロツク９は前述の光学素子等を支持し、かつ包み
込んで、外部光が侵入するのを防ぐ働きをするも
のであり、箱状のものが多い。Configuration of the conventional example and its problems Figure 1 shows the configuration of the conventional example. In FIG. 1, 1 is a semiconductor laser, 2 is a collimating lens, 3 is a half mirror, 4 is an objective lens, 5 is a recording medium,
6 is an objective lens actuator, 7 is a convex lens,
8 is a photodetector, and 9 is an optical block. The optical block 9 serves to support and envelop the aforementioned optical elements to prevent external light from entering, and is often box-shaped.
半導体レーザ１から出た発散光はコリメートレ
ンズ２で平行光とされ、ハーフミラー３を経て対
物レンズ４により記録媒体５上に微小光スポツト
を形成し、情報の記録および再生を行なう。記録
媒体５からの反射光は対物レンズ４を経て、ハー
フミラー３で反射され、凸レンズ７により光検出
器８へ集光される。光検出器８では、再生時の情
報信号のほか、記録、再生時のフオーカス及びト
ラツキング誤差信号を検出する。その信号をもと
に、対物レンズアクチユエータ６を駆動し、対物
レンズを記録媒体５の面ブレ、トラツクずれに追
従させて、フオーカスサーボ、トラツキングサー
ボをかける。 The diverging light emitted from the semiconductor laser 1 is made into parallel light by a collimating lens 2, passes through a half mirror 3, and is formed by an objective lens 4 to form a minute optical spot on a recording medium 5, thereby recording and reproducing information. The reflected light from the recording medium 5 passes through the objective lens 4, is reflected by the half mirror 3, and is focused onto the photodetector 8 by the convex lens 7. The photodetector 8 detects not only information signals during reproduction but also focus and tracking error signals during recording and reproduction. Based on the signal, the objective lens actuator 6 is driven to cause the objective lens to follow the surface wobbling and track deviation of the recording medium 5, thereby applying focus servo and tracking servo.
光学ブロツク９は、軽量かつ高精度が要求さ
れ、アルミウム等の軽金属で作られる場合が多
い。半導体レーザ１の波長が8300Åの場合、アル
ミニウムの反射率は約80％、表面に黒色アルマイ
ト処理を施した場合でも約30％の反射率を有して
いる。 The optical block 9 is required to be lightweight and have high precision, and is often made of light metal such as aluminum. When the wavelength of the semiconductor laser 1 is 8300 Å, the reflectance of aluminum is about 80%, and even when the surface is subjected to black alumite treatment, the reflectance is about 30%.
半導体レーザ１、コリメートレンズ２を経て、
ハーフミラー３へ入射する光のうち、一部はハー
フミラー３で反射され、光学ブロツク９の内壁面
に入射する。光学ブロツク９の内壁面で反射され
た光は、その一部がハーフミラー３へ再入射し、
凸レンズ７を経て光検出器８へ入射する。これ
は、記録媒体５から以外の光が光検出器８へ入射
してしまうということであり、情報信号や各種サ
ーボ誤差信号の検出に悪影響を与えてしまうとい
う問題点を有する。 After passing through the semiconductor laser 1 and collimating lens 2,
A part of the light incident on the half mirror 3 is reflected by the half mirror 3 and is incident on the inner wall surface of the optical block 9. A part of the light reflected by the inner wall surface of the optical block 9 enters the half mirror 3 again,
The light passes through a convex lens 7 and enters a photodetector 8 . This means that light other than that from the recording medium 5 enters the photodetector 8, which poses a problem in that it adversely affects the detection of information signals and various servo error signals.
発明の目的
本発明は光学素子や光学ブロツク等により発生
する本来必要でない光である迷光を除去し、高品
質の信号を検出可能な光学式記録再生装置を提供
することを目的とする。OBJECTS OF THE INVENTION It is an object of the present invention to provide an optical recording/reproducing device capable of detecting high-quality signals by removing stray light that is originally unnecessary light generated by optical elements, optical blocks, etc.
発明の構成
本発明は半導体レーザ等の光源と、対物レンズ
等のレンズ系及びハーフミラー、光検出器等の光
学素子で構成され、記録媒体上に微小光スポツト
を形成し、光学的に情報を記録もしくは再生する
記録再生部を備えてなり、前述の光学素子群を支
持し、かつ外部光の侵入を防ぐための光学ブロツ
クの内側に位置し、光源からの光が、対物レンズ
以外の方向へ反射もしくは透過した光を受光する
ように設置された、断面形状が受光面側がノコギ
リ刃状で、前記受光面側に黒色塗装を施した光吸
収板を有する光学式記録再生装置であり、迷光の
発生を防ぎ誤動作防止に効果の大きいものであ
る。Structure of the Invention The present invention is composed of a light source such as a semiconductor laser, a lens system such as an objective lens, and optical elements such as a half mirror and a photodetector, and forms a minute light spot on a recording medium to optically transmit information. It is equipped with a recording/reproducing unit for recording or reproducing, and is located inside an optical block that supports the aforementioned optical element group and prevents external light from entering, and prevents the light from the light source from going in a direction other than the objective lens. This is an optical recording and reproducing device that has a light absorbing plate with a sawtooth cross-section on the light receiving surface side and a black coating on the light receiving surface side, which is installed to receive reflected or transmitted light. This is highly effective in preventing occurrences and malfunctions.
実施例の説明
本発明の一実施例を第２図に示す。第２図にお
いて１〜９は従来例と同様の構成である。１０は
光吸収板であり、この図の場合は光学ブロツク内
側壁面に固定してある。第３図は光吸収板の外観
形状を示したものであり、図示したようなノコギ
リ刃状の溝を有するものである。第３図は一方向
のみの溝であるが、これは他の方向（第３図にお
いては上下方向等）の溝をさらに切つた形状のも
のでも良い。表面には反射防止用の黒色塗料等を
塗布しておく。DESCRIPTION OF THE EMBODIMENTS An embodiment of the present invention is shown in FIG. In FIG. 2, numerals 1 to 9 have the same structure as the conventional example. 10 is a light absorption plate, which in this figure is fixed to the inner wall surface of the optical block. FIG. 3 shows the external appearance of the light absorption plate, which has sawtooth-shaped grooves as shown. Although FIG. 3 shows a groove in only one direction, it may be formed by further cutting a groove in another direction (in FIG. 3, the vertical direction, etc.). Apply anti-reflection black paint to the surface.
第４図は、光吸収板１０の動作原理を示した側
面図である。ハーフミラー３からの光を強度Iiと
すると、Iiは光吸収板１０のノコギリ刃状のＡ面
およびＢ面で計３回反射されIoとなる。Ａ面およ
びＢ面の反射率をＲとすると、
Io＝R3・Ii
で表わされる。仮にＲ＝0.1とすると、光吸収板
１０がない場合、Iiの10％の光が光学ブロツク９
内側壁面で反射され、ハーフミラー３等の光学素
子へ再入射してしまう。光吸収板１０がある場
合、
Io＝0.13×Ii＝0.001Ii
となる。すなわち、Iiの0.1％の光しか光学素子の
方へ反射しなくなり、迷光の影響による情報信号
やサーボ誤差信号の品質劣化を防ぐことが可能と
なる。 FIG. 4 is a side view showing the operating principle of the light absorption plate 10. When the intensity of the light from the half mirror 3 is Ii, Ii is reflected a total of three times by the sawtooth-shaped surfaces A and B of the light absorption plate 10 and becomes Io. When the reflectance of the A-plane and the B-plane is R, it is expressed as Io=R 3 ·Ii. If R = 0.1, if there is no light absorption plate 10, 10% of the light of Ii will pass through the optical block 9.
It is reflected by the inner wall surface and re-enters the optical element such as the half mirror 3. When there is a light absorption plate 10, Io=0.1 3 ×Ii=0.001Ii. That is, only 0.1% of the light Ii is reflected toward the optical element, making it possible to prevent quality deterioration of information signals and servo error signals due to the influence of stray light.
第５図は第４図の場合と異なる光吸収板の断面
形状および動作原理を示してある。第５図におい
て、IiはＡ，Ｂ面で計４回反射されてIoとなり、
Io＝0.14×Ii＝0.0001
となり、これはIiの0.01％の光しか反射しないこ
とを意味しており、迷光の発生をさらにおさえる
ことが可能である。 FIG. 5 shows the cross-sectional shape and operating principle of the light absorption plate, which is different from that in FIG. 4. In Figure 5, Ii is reflected a total of 4 times on planes A and B and becomes Io, resulting in Io = 0.1 4 × Ii = 0.0001, which means that only 0.01% of the light of Ii is reflected, and stray light It is possible to further suppress the occurrence of
第６図は、本発明の他の実施例であり図中１〜
１０は、第２図と同じである。第６図で第２図と
異なるのは、ハーフミラー３の用い方であり、半
導体レーザ１からの光は、コリメートレンズ２を
経て、ハーフミラー３で反射され、対物レンズ４
へと向かう。この場合、コリメートレンズ２から
の光のうちの一部は、ハーフミラー３を透過し
て、光学ブロツク９の内側壁面へ向かうため、そ
この位置へ、光吸収板１０を設置することによ
り、これらの光を吸収し迷光の発生を防ぐことが
可能である。 FIG. 6 shows another embodiment of the present invention, 1 to 1 in the figure.
10 is the same as in FIG. What is different in FIG. 6 from FIG. 2 is the use of a half mirror 3, in which the light from the semiconductor laser 1 passes through the collimating lens 2, is reflected by the half mirror 3, and is reflected by the objective lens 4.
heading towards. In this case, some of the light from the collimating lens 2 passes through the half mirror 3 and heads toward the inner wall surface of the optical block 9, so by installing the light absorption plate 10 at that position, It is possible to absorb this light and prevent the generation of stray light.
第２図および第６図において、光吸収板１０
は、光学ブロツク９の内側壁面に固定した状態で
示されているが、光吸収板の設置法はこの限にで
はなく、たとえばハーフミラー３に接するように
して固定しても良い。又、第２図および第６図で
示した実施例は、光吸収板１０を別体で設けたも
のであるが、本発明の他の実施例として、光学ブ
ロツク９の内側壁面を加工もしくは成形により、
光吸収板１０の受光面と同様の形状とした装置に
よつても同じ効果を得ることができる。 In FIGS. 2 and 6, the light absorption plate 10
Although shown as being fixed to the inner wall surface of the optical block 9, the method of installing the light absorption plate is not limited to this, and it may be fixed so as to be in contact with the half mirror 3, for example. Further, in the embodiment shown in FIGS. 2 and 6, the light absorption plate 10 is provided separately, but as another embodiment of the present invention, the inner wall surface of the optical block 9 may be processed or molded. According to
The same effect can be obtained by using a device having the same shape as the light receiving surface of the light absorbing plate 10.
発明の効果
本発明を実施することにより、光学ブロツク内
面反射に起因する迷光の発生を大幅に低減するこ
とが可能であり、迷光による情報信号、サーボ誤
差信号の品質低下を防ぎ、高品位の記録再生を行
なうことが可能となるものである。Effects of the Invention By carrying out the present invention, it is possible to significantly reduce the occurrence of stray light caused by internal reflections of optical blocks, prevent deterioration in the quality of information signals and servo error signals due to stray light, and achieve high-quality recording. This makes it possible to perform playback.
第１図は従来の光学式記録再生装置の断面図、
第２図は本発明の一実施例の断面図、第３図は光
吸収板の形状を示す斜視図、第４図は光吸収板の
動作原理を示す側面図、第５図は他の形状による
動作原理を示す側面図、第６図は本発明の他の実
施例を示す断面図である。
１……半導体レーザ、２……コリメートレン
ズ、３……ハーフミラー、４……対物レンズ、５
……記録媒体、６……対物レンズ駆動装置、７…
…凸レンズ、８……光検出器、９……光学ブロツ
ク、１０……光吸収板。
Figure 1 is a cross-sectional view of a conventional optical recording/reproducing device.
Fig. 2 is a sectional view of one embodiment of the present invention, Fig. 3 is a perspective view showing the shape of the light absorption plate, Fig. 4 is a side view showing the operating principle of the light absorption plate, and Fig. 5 is another shape. FIG. 6 is a side view showing the principle of operation according to the present invention, and FIG. 6 is a sectional view showing another embodiment of the present invention. 1...Semiconductor laser, 2...Collimating lens, 3...Half mirror, 4...Objective lens, 5
...Recording medium, 6...Objective lens drive device, 7...
... Convex lens, 8 ... Photodetector, 9 ... Optical block, 10 ... Light absorption plate.
Claims (1)
子を有し、記録媒体上に微小光スポツトを形成
し、光学的に情報を記録もしくは再生する記録再
生部を備え、前記光学素子群を支持し包み込む光
学ブロツクの内側に位置し、前記光源から出た光
が、前記記録媒体に到達する以前に、前記対物レ
ンズ以外の方向へ前記ハーフミラーで反射もしく
は透過した光を受光するべく設置された、断面形
状が受光面側がノコギリ刃状で、前記受光面側に
黒色塗装を施した光吸収部を具備したことを特徴
とする光学式記録再生装置。 ２ 光学ブロツクの内側壁面で、前記ハーフミラ
ーからの反射光もしくは透過光を受光する部分の
断面形状を受光面側がノコギリ刃状とし、前記受
光面側に黒色塗装を施した光学ブロツクを有した
ことを特徴とする特許請求の範囲第１項記載の光
学式記録再生装置。[Scope of Claims] 1. A recording and reproducing unit that has an optical element such as a light source, a half mirror, and an objective lens, forms a minute light spot on a recording medium, and optically records or reproduces information, It is located inside an optical block that supports and envelops the element group, and receives the light emitted from the light source that is reflected or transmitted by the half mirror in a direction other than the objective lens before reaching the recording medium. What is claimed is: 1. An optical recording/reproducing device comprising: a light absorbing portion having a sawtooth cross-sectional shape on the light receiving surface side and coated black on the light receiving surface side; 2. The optical block has an inner wall surface of the optical block in which the cross-sectional shape of the portion that receives the reflected light or transmitted light from the half mirror is sawtooth-shaped on the light-receiving surface side, and the light-receiving surface side is painted black. An optical recording/reproducing device according to claim 1, characterized in that:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58046276A JPS59171039A (en) | 1983-03-18 | 1983-03-18 | Optical recording and reproducing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58046276A JPS59171039A (en) | 1983-03-18 | 1983-03-18 | Optical recording and reproducing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59171039A JPS59171039A (en) | 1984-09-27 |
| JPH0318256B2 true JPH0318256B2 (en) | 1991-03-12 |
Family
ID=12742699
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58046276A Granted JPS59171039A (en) | 1983-03-18 | 1983-03-18 | Optical recording and reproducing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59171039A (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61105924U (en) * | 1984-12-17 | 1986-07-05 | ||
| JPH0725862Y2 (en) * | 1985-08-26 | 1995-06-07 | アルプス電気株式会社 | Optical pickup lens device |
| JPS6265247A (en) * | 1985-09-13 | 1987-03-24 | Sharp Corp | Optical pick-up device |
| JPH0810851Y2 (en) * | 1986-07-01 | 1996-03-29 | 三洋電機株式会社 | Optical pickup device |
| JPH0590619U (en) * | 1992-05-20 | 1993-12-10 | 松下電器産業株式会社 | Optical head |
| JP2508777Y2 (en) * | 1993-04-15 | 1996-08-28 | 古河電気工業株式会社 | Signal transmission device for vehicle steering mechanism |
| JP4719596B2 (en) * | 2006-03-14 | 2011-07-06 | 西部電機株式会社 | Machine tool headstock |
-
1983
- 1983-03-18 JP JP58046276A patent/JPS59171039A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59171039A (en) | 1984-09-27 |
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