JPS62264453A - Optical recording and reproducing device - Google Patents
Optical recording and reproducing deviceInfo
- Publication number
- JPS62264453A JPS62264453A JP61107959A JP10795986A JPS62264453A JP S62264453 A JPS62264453 A JP S62264453A JP 61107959 A JP61107959 A JP 61107959A JP 10795986 A JP10795986 A JP 10795986A JP S62264453 A JPS62264453 A JP S62264453A
- Authority
- JP
- Japan
- Prior art keywords
- semiconductor laser
- light
- parallel
- cylindrical lens
- substantially cylindrical
- 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.)
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Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 51
- 239000004065 semiconductor Substances 0.000 claims abstract description 60
- 238000007493 shaping process Methods 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 abstract 1
- 230000015654 memory Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
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Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、コンピュータ用外部メモリ、オーディオ用録
再システム、ビデオ用録再システム等、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光
学式記録再生装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is an optical system that can be used in all systems including equipment for recording or reproducing information, such as external memory for computers, audio recording/playback systems, video recording/playback systems, etc. The present invention relates to a recording/reproducing device.
従来の技術
現代は情報化時代といわれており、その中核をなす高密
度大容量メモリーの技術開発が盛んに行なわれている。Conventional Technology The modern era is called the information age, and the technology development of high-density, large-capacity memory, which forms the core of this age, is actively being carried out.
メモリーに要求される能力としては、前述の高密度、大
容量に加え、高信頓性、高速アクセス等が挙げられ、そ
れらすべてを満足するものとして光デイスクメモリーが
最も注目されている。光デイスクメモリーは、光学的に
情報を記録媒体に記録するものであり、最近では記録し
た情報の消去も可能な光磁気ディスクに関する研究も数
多く行なわれている。In addition to the above-mentioned high density and large capacity, the capabilities required of memory include high reliability and high speed access, and optical disk memory is attracting the most attention as a device that satisfies all of these requirements. An optical disk memory is a device that optically records information on a recording medium, and recently, a lot of research has been conducted on magneto-optical disks that can also erase recorded information.
光デイスクメモリーの光源には、半導体レーザが主とし
て用いられている。Semiconductor lasers are mainly used as light sources for optical disk memories.
第3図は半導体レーザと半導体レーザからの発散光の遠
視野像全示すものである。第3図において1は半導体レ
ーザである。FIG. 3 shows the entire far-field image of the semiconductor laser and the divergent light from the semiconductor laser. In FIG. 3, 1 is a semiconductor laser.
半導体レーザ1はレーザチップ接合面に平行な方向と垂
直な方向とでは光の発散の仕方が異なる。The semiconductor laser 1 emits light differently in a direction parallel to and perpendicular to the laser chip bonding surface.
すなわち半導体レーザ1から出る光の遠視野像は、だ円
状となっている。通常の光学系でこの半導体レーザ1の
光を絞ると、その光スポツト形状もやはり、だ円となっ
てしまう。光学式ディジタルオーディオディスクの再生
専用光学系では、それをさけるだめ、コリメートレンズ
を開口数(HA)の小さいものを用いる、すなわち半導
体レーザ1のだ円ビームの中央部のみを使用し、他の部
分を捨てることによって、ディスク上に円形光スポット
を得ている。ところが、半導体レーザを用いた記録再生
光学系では、前述の方法だと、光パワーの利用効率が低
くなるため不利である。よって従来では以下に述べる様
な方法が利用されてきた。That is, the far-field image of the light emitted from the semiconductor laser 1 is elliptical. If the light from this semiconductor laser 1 is focused using a normal optical system, the shape of the light spot will also become an ellipse. In order to avoid this, in the playback-only optical system for optical digital audio discs, a collimating lens with a small numerical aperture (HA) is used, that is, only the central part of the elliptical beam of the semiconductor laser 1 is used, and the other parts are By throwing away a circular light spot is obtained on the disk. However, in a recording/reproducing optical system using a semiconductor laser, the above-mentioned method is disadvantageous because the optical power utilization efficiency becomes low. Therefore, in the past, methods such as those described below have been used.
以下、図面を参照しながら上述したような従来の光学式
記録再生装置について説明を行う。Hereinafter, a conventional optical recording/reproducing apparatus as described above will be explained with reference to the drawings.
第4図は従来の光学式記録再生装置の一例を示すもので
ある。第4図において、1は半導体レーザ、2はコリメ
ートレンズ、3は凹シリンドリカルレンズ、4は凸シリ
ンドリカルレンズである。FIG. 4 shows an example of a conventional optical recording/reproducing device. In FIG. 4, 1 is a semiconductor laser, 2 is a collimating lens, 3 is a concave cylindrical lens, and 4 is a convex cylindrical lens.
第4図aは第3図のP矢視図すなわち半導体レーザチッ
プ接合方向平行側、bは垂直側であり第3図のQ矢視図
すなわち第4図aを光軸中心に90゜回転した状態を示
す図である。Figure 4a is a view in the direction of the P arrow in Figure 3, that is, the side parallel to the semiconductor laser chip bonding direction, and b is the perpendicular side, which is a view in the direction of the Q arrow in Figure 3, that is, rotated 90 degrees around the optical axis from Figure 4a. It is a figure showing a state.
以上のように構成された従来の光学式記録再生装置の一
例について、以下その動作の説明を行う。The operation of an example of the conventional optical recording/reproducing apparatus configured as described above will be explained below.
半導体レーザ1からの光はコリメートレンズ2により平
行光とされるが、ここではビームの断面形状はだ円であ
る。それが凹シリンドリカルレンズ3および凸シリンド
リカルレンズ4を通過することにより、第4国電の平行
側のみ拡大され円形ビームとなる。The light from the semiconductor laser 1 is made into parallel light by the collimating lens 2, but the cross-sectional shape of the beam here is an ellipse. By passing through the concave cylindrical lens 3 and the convex cylindrical lens 4, only the parallel side of the fourth national radio is expanded and becomes a circular beam.
第5図aは従来の光学式記録再生装置の第二の例を示す
もので、第5図す、cは第5図aのX−X線、Y−Y線
断面をそれぞれ示している。第6図において、1は半導
体レーザ、2はコリメートレンズ、5はプリズムである
。、
以上のように構成された従来の光学式記録再生装置の第
二の例について、以下その動作の説明を行う。FIG. 5a shows a second example of a conventional optical recording/reproducing device, and FIGS. 5 and 5c show cross sections taken along line X-X and Y-Y in FIG. 5a, respectively. In FIG. 6, 1 is a semiconductor laser, 2 is a collimating lens, and 5 is a prism. The operation of the second example of the conventional optical recording/reproducing apparatus configured as described above will be explained below.
第4図と同様に、コリメートレンズ2による平行光の断
面形状はだ円である。(X−X線断面)この平行光が入
射するプリズム5は三角柱状をしており、コリメートレ
ンズ2からの半導体レーザチップ接合方向平行側のみを
屈折透過させることによって拡大し、円形ビームに変換
している。Similar to FIG. 4, the cross-sectional shape of the parallel light produced by the collimating lens 2 is an ellipse. (X-X line cross section) The prism 5 on which this parallel light enters has a triangular prism shape, and is expanded by refracting and transmitting only the side parallel to the semiconductor laser chip bonding direction from the collimating lens 2, and converting it into a circular beam. ing.
(Y−Y線断面)
発明が解決しようとする問題点
しかしながら、第4図に示した従来例の構成では、平行
な円形ビームを得るためにコリメートレンズ2、凹シリ
ンドリカルレンズ3、凸シリンドリカルレンズ4という
3個の光学素子が必要であり、かつ各々の位置調整が複
雑てなる。さらに第5図に示した従来例の構成では、コ
リメートレンズ2.プリズム5の2個の光学素子で平行
な円形ビームを得ることができるため、構成、調整は簡
単であるが、光軸がプリズム6を境にして傾くため、光
学系筐体形状が複雑化・大型化するという問題点を有し
ていた。(Y-Y line cross section) Problems to be Solved by the Invention However, in the conventional configuration shown in FIG. Three optical elements are required, and the position adjustment of each is complicated. Furthermore, in the conventional configuration shown in FIG. 5, the collimating lens 2. Since a parallel circular beam can be obtained with the two optical elements of the prism 5, the configuration and adjustment are simple, but since the optical axis is tilted with the prism 6 as the boundary, the shape of the optical system housing becomes complicated. It had the problem of increasing its size.
本発明は上記問題点に鑑み、簡単な構成と調整により光
軸が半導体レーザの発散光光軸と傾くことのない平行な
円形ビームを得ることのできる光学式記録再生装置を提
供するものである。In view of the above-mentioned problems, the present invention provides an optical recording and reproducing device that can obtain a parallel circular beam whose optical axis does not tilt with respect to the diverging optical axis of a semiconductor laser through simple configuration and adjustment. .
問題点を解決するだめの手段
この目的を達成するために本発明の光学式記録再生装置
は、半導体レーザと、この半導体レーザからの発散光光
軸上に位置して、半導体レーザチップ接合方向の垂直側
と平行側に対して各々の略円筒状光屈折面を有するすく
なくとも一個の光学素子を備え、各々の光屈折面の相異
なる焦点を半導体レーザの発光点に位置させて配置する
構成となっている。Means for Solving the Problems In order to achieve this object, the optical recording/reproducing apparatus of the present invention includes a semiconductor laser and a diverging beam located on the optical axis of the semiconductor laser in the direction of joining the semiconductor laser chips. At least one optical element having substantially cylindrical light refractive surfaces on the vertical side and the parallel side is provided, and the different focal points of the respective light refractive surfaces are positioned at the light emitting point of the semiconductor laser. ing.
作用
本発明はこの構成によって、半導体レーザからの発散光
は、第1の略円筒状光屈折面で、半導体レーザチップ接
合方向垂直側のみが平行光に変換され、第2の略円筒状
光屈折面で、接合方向平行側のみが平行光に変換される
。According to the present invention, with this configuration, the diverging light from the semiconductor laser is converted into parallel light only on the side perpendicular to the semiconductor laser chip bonding direction by the first substantially cylindrical light refracting surface, and the diverging light from the semiconductor laser is converted into parallel light by the second substantially cylindrical light refracting surface. Only the side parallel to the joining direction is converted into parallel light.
したがって、コリメートレンズを必要としない簡単な構
成と調整により光軸が半導体レーザの発散光光軸と傾く
ことなく、半導体レーザの発光特性であるだ円ビームを
平行な円形ビームに変換することができる。Therefore, with a simple configuration and adjustment that does not require a collimating lens, it is possible to convert an elliptical beam, which is the emission characteristic of a semiconductor laser, into a parallel circular beam without the optical axis tilting to the diverging optical axis of the semiconductor laser. .
実施例
以下本発明の一実施例について、図面を参照しながら説
明する。第1図は本発明の一実施例における光学式記録
再生装置を示すものである。第1図aは第3図のP矢視
図、すなわち半導体レーザチップ接合方向平行側、第1
図すは垂直側であり第3図のQ矢視図、すなわち第1図
aを光軸中心に90°回転した図を示すものである。第
1図において、1は半導体レーザ、6は略同筒状レンズ
人、7は略円筒状レンズBである。EXAMPLE An example of the present invention will be described below with reference to the drawings. FIG. 1 shows an optical recording/reproducing apparatus according to an embodiment of the present invention. Figure 1a is a view in the direction of arrow P in Figure 3, that is, the side parallel to the semiconductor laser chip bonding direction,
The figure shows the vertical side and is a view taken in the direction of the Q arrow in FIG. 3, that is, a view obtained by rotating 90° from FIG. 1a around the optical axis. In FIG. 1, 1 is a semiconductor laser, 6 is a substantially cylindrical lens, and 7 is a substantially cylindrical lens B.
以上のように構成された光学式記録再生装置について、
以下その動作について説明する。Regarding the optical recording and reproducing device configured as above,
The operation will be explained below.
まず半導体レーザ1からの断面形状がだ円をした発散光
(第3図参照)が略円筒状レンズA6に入射する。First, diverging light having an elliptical cross-sectional shape (see FIG. 3) from the semiconductor laser 1 enters the substantially cylindrical lens A6.
略円筒状レンズA6は、半導体レーザーの発散光のうち
半導体レーザチップ接合方向に対して垂直な方向に凸屈
折面を有しており、かつ焦点距離がf であり、焦点位
置を半導体レーザーの発光ム
点に合致させれば、第1図すに示すように入射した発散
光に対し、半導体レーザチップ接合方向垂直側のみに作
用して、接合方向垂直側については平行な光ビームに変
換する。この作用により、Q矢視図の光ビーム径はり、
となる。The substantially cylindrical lens A6 has a convex refracting surface in a direction perpendicular to the semiconductor laser chip bonding direction of the diverging light of the semiconductor laser, has a focal length f, and has a focal position that is aligned with the emission light of the semiconductor laser. If the laser beam is aligned with the beam point, the incident divergent light acts only on the side perpendicular to the bonding direction of the semiconductor laser chip, as shown in FIG. 1, and the side perpendicular to the bonding direction is converted into a parallel light beam. Due to this action, the diameter of the light beam in the Q arrow view increases,
becomes.
この光ビームは、略円筒状レンズBTに入射するが、略
円筒状レンズBTは、半導体レーザーの発散光のうち半
導体レーザチップ接合方向平行側に凸屈折[1有し、か
つ焦点距離がf であり、焦点位置を半導体レーザーの
発光点に合致させれば、第1図aに示すように光ビーム
に対し、半導体レーザチップ接合方向平行側のみに作用
して、接合方向平行側については平行な光ビームに変換
する。この作用によりP矢視図の光ビーム径はり。This light beam enters the substantially cylindrical lens BT, which has a convex refraction [1] on the side parallel to the semiconductor laser chip bonding direction of the diverging light of the semiconductor laser, and has a focal length f. If the focal point is aligned with the light emitting point of the semiconductor laser, as shown in Figure 1a, it will act on the light beam only on the side parallel to the bonding direction of the semiconductor laser chip, and will not act parallel to the side parallel to the bonding direction. Convert into a beam of light. This action increases the diameter of the light beam in the P arrow view.
となる。第3図に示しだ遠視野像において、半導体レー
ザテクブ接合方向平行側と垂直側のビーム径比に応じて
、第1図のf、fB を特定の値にム
設定すれば、D=D(=Do とおく)とでき、ム
B
所望の径り。の平行な円形ビームを得ることかできる。becomes. In the far-field pattern shown in FIG. 3, if f and fB in FIG. Do) and M
B Desired diameter. Can you get parallel circular beams?
尚、fA 、f、は異なる値となる。Note that fA and f have different values.
以上のように本実施例によれば、半導体レーザの発散光
光軸上に位置して、同一の焦点位置を持つ2個の略円筒
状レンズを設けることにより、コリメートレンズを必要
としない簡単な構成で、光軸が半導体レーザの発散光光
軸と傾くことのない、所望の径の平行な円形ビームを得
ることができる。As described above, according to this embodiment, by providing two substantially cylindrical lenses that are located on the optical axis of the diverging light of the semiconductor laser and have the same focal position, a simple method that does not require a collimating lens is achieved. With this configuration, it is possible to obtain a parallel circular beam with a desired diameter and whose optical axis is not tilted with respect to the diverging optical axis of the semiconductor laser.
調整に関しては、略同筒状レンズ人のみの調整でQ矢視
図で平行光を達成し、略円筒状レンズBのみの調整でP
矢視図で平行光を達成すればよいから、比較的容易に達
成できる。Regarding the adjustment, parallel light can be achieved in the Q arrow view by adjusting only the approximately cylindrical lens B, and P can be achieved by adjusting only the approximately cylindrical lens B.
Since it is sufficient to achieve parallel light in the arrow view, this can be achieved relatively easily.
以下、本発明の池の実施例について、図面を参照しなが
ら説明する。第2図は本発明の他の実施例における光学
式記録再生装置を示すものである。Embodiments of the pond of the present invention will be described below with reference to the drawings. FIG. 2 shows an optical recording/reproducing apparatus according to another embodiment of the present invention.
第2図aおよびbは、第1図と同様に第3図のP矢視図
とQ矢視図である。FIGS. 2a and 2b are a view along the P arrow and a view along the Q arrow of FIG. 3, similar to FIG. 1.
第2図において、1は半導体レーザ、8は相異なる2つ
の略円筒状光屈折面を有する一個のビーム整形素子であ
る。In FIG. 2, 1 is a semiconductor laser, and 8 is a beam shaping element having two different approximately cylindrical light refracting surfaces.
以上のように構成された光学式記録再生装置について、
以下その動作について説明する。Regarding the optical recording and reproducing device configured as above,
The operation will be explained below.
まず半導体レーザ1からの断面形状がだ円をした発散光
(第3図参照)がビーム整形素子8に入射する、ビーム
整形素子の略円筒状光屈折面人は、焦点距離がfAであ
り、焦点位置を半導体レーザ1の発光点に合致させれば
、Q矢視図の光ビームは平行な光ビームに変換される。First, the diverging light having an elliptical cross-sectional shape from the semiconductor laser 1 (see FIG. 3) enters the beam shaping element 8. The beam shaping element has a substantially cylindrical light refractive surface and has a focal length of fA. By aligning the focal point position with the light emitting point of the semiconductor laser 1, the light beam in the Q arrow view is converted into a parallel light beam.
この光ビームが入光する略円筒状光屈折面Bは、焦点距
離がf。The approximately cylindrical light refractive surface B on which this light beam enters has a focal length of f.
であり、焦点位置を半導体レーザ1の発光点に合致させ
れば、P矢視図の光ビームは平行な光ビームに弯換され
る。第3図に示した遠視野像において、発散光の平行側
と垂直側のビーム径比に応じて、第2図のf 、f
を特定の値に設定したビム B
−ム整形素子を用いれば、所望の径の平行な円形ビーム
を得ることがでキル。If the focal position is made to coincide with the light emitting point of the semiconductor laser 1, the light beam in the P arrow view is deflected into a parallel light beam. In the far-field image shown in Fig. 3, depending on the beam diameter ratio between the parallel side and the perpendicular side of the diverging light, f and f in Fig. 2
By using a beam shaping element with B-m set to a specific value, it is possible to obtain a parallel circular beam of the desired diameter.
以上のように本実施例によれば、半導体レーザの発散光
光軸上に位置して、相異なる焦点を半導体レーザの発光
点に位置させた相異なる2つの略円筒状光屈折面を有す
る一個のビーム整形素子を設けることにより、単一の素
子で平行光変換機能とビーム整形機能とを達成できるた
め、簡単な構成で光軸が半導体レーザの発散光光軸と傾
くことのない、所望の径の平行な円形ビームを得ること
ができる。さらに単一の素子であるから、調整が容易で
かつ調整後の安定性にすぐれている。以上により、光学
系全体形状の小型・簡素化を果たすことができる。As described above, according to this embodiment, one optical fiber is located on the optical axis of the diverging light of the semiconductor laser and has two different substantially cylindrical light refractive surfaces with different focal points located at the light emitting point of the semiconductor laser. By providing a beam shaping element of A circular beam with parallel diameters can be obtained. Furthermore, since it is a single element, adjustment is easy and stability after adjustment is excellent. As described above, the overall shape of the optical system can be made smaller and simpler.
発明の効果
本発明は、半導体レーザと半導体レーザの発散光のうち
半導体レーザテップ接合面垂直側に凸屈折面を有する第
1の略円筒状レンズと、接合面平行側に凸屈折面を有す
る第2の略円筒状レンズとを備え、2個の略円筒状レン
ズは相異なる焦点位置を有し、各々の焦点を半導体レー
ザの発光点に位置させたことにより、コリメートレンズ
を必要としない簡単な構成で、光軸が半導体レーザの発
散光光軸と傾くことのない、所望の径の平行な円形ビー
ムを得ることができる。したがって従来の光学系と比較
して、小型・簡素化を果たすことができる。まだ、2個
の略円筒状レンズを、相異なる焦点が半導体レーザの発
光点に位置した相異なる2つの略円筒状光屈折面を有す
る一個のビーム整形素子としたことにより、調整が簡単
で調整後の安定性を増大させることができるという効果
を得ることができる優れた光学式記録再生装置を実現で
きるものである。Effects of the Invention The present invention provides a first substantially cylindrical lens having a convex refractive surface on the side perpendicular to the junction surface of the semiconductor laser tip and a second lens having a convex refraction surface on the side parallel to the junction surface of the semiconductor laser and the divergent light of the semiconductor laser. The two substantially cylindrical lenses have different focal positions, and each focal point is located at the light emitting point of the semiconductor laser, resulting in a simple configuration that does not require a collimating lens. Thus, it is possible to obtain a parallel circular beam with a desired diameter and whose optical axis is not tilted with respect to the diverging optical axis of the semiconductor laser. Therefore, compared to conventional optical systems, it can be made smaller and simpler. However, since the two substantially cylindrical lenses are made into one beam shaping element having two different substantially cylindrical light refractive surfaces whose different focal points are located at the light emitting point of the semiconductor laser, adjustment is easy. This makes it possible to realize an excellent optical recording/reproducing device that can obtain the effect of increasing subsequent stability.
第1図a、bは本発明の一実施例における光学式記録再
生装置を示す構成図、第2図a、bは本発明の池の実施
例における光学式記録再生装置を示す構成図、第3図は
半導体レーザと半導体レーザからの発散光の遠視野像を
示す斜視図、第4図a、bは従来の光学式記録再生装置
を示す構成図、第5図aは従来の光学式記録再生装置の
第二の例を示す構成図、第6図すは同X−X線断面図、
第5図Cは同X−X線断面図である。
1・・・・半導体レーザ、2・・・・・・コリメートレ
ンズ、6・・・・・・プリズム、6・・・・・・略同筒
状レンズ人、7・・・・・・略円筒状レンズB、 8・
・・・・・ビーム整形素子。
代理人の氏名 弁理士 中 尾 敏 男 ほか1名第1
図
1−一千肩竪イ1(し−ワ′
C−゛詐i巴油イ夫レンズA1A and 1B are block diagrams showing an optical recording and reproducing apparatus in an embodiment of the present invention, FIGS. 2A and 2B are block diagrams showing an optical recording and reproducing apparatus in an embodiment of the present invention, and FIGS. Figure 3 is a perspective view showing a semiconductor laser and a far-field image of divergent light from the semiconductor laser, Figures 4a and b are block diagrams showing a conventional optical recording/reproducing device, and Figure 5a is a conventional optical recording. A configuration diagram showing a second example of the reproduction device, FIG. 6 is a sectional view taken along the line X-X of the same,
FIG. 5C is a sectional view taken along the line X--X. 1... Semiconductor laser, 2... Collimating lens, 6... Prism, 6... Approximately the same cylindrical lens, 7... Approximately cylindrical shaped lens B, 8.
...beam shaping element. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 1 - Straight shoulders 1
Claims (2)
ザチップ接合方向に対して垂直な方向に凸屈折面を有す
る第1の略円筒状レンズと、半導体レーザチップ接合方
向に対して平行な方向に凸屈折面を有する第2の略円筒
状レンズとを備え、前記第1の略円筒状レンズと前記第
2の略円筒状レンズは前記発散光光軸上に位置させると
ともに、各々の焦点を前記半導体レーザの発光点に位置
させることを特徴とする光学式記録再生装置。(1) a semiconductor laser, a first substantially cylindrical lens having a convex refractive surface in a direction perpendicular to the semiconductor laser chip bonding direction of the semiconductor laser, and a first substantially cylindrical lens convex in a direction parallel to the semiconductor laser chip bonding direction; a second substantially cylindrical lens having a refractive surface, the first substantially cylindrical lens and the second substantially cylindrical lens are located on the optical axis of the diverging light, and each focal point is located on the optical axis of the diverging light. An optical recording/reproducing device characterized in that it is located at the light emitting point of a laser.
、一個のビーム整形素子の両端面に形成されていること
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。(2) The optical recording according to claim 1, wherein the first substantially cylindrical lens and the second substantially cylindrical lens are formed on both end surfaces of one beam shaping element. playback device.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP61107959A JPS62264453A (en) | 1986-05-12 | 1986-05-12 | Optical recording and reproducing device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP61107959A JPS62264453A (en) | 1986-05-12 | 1986-05-12 | Optical recording and reproducing device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS62264453A true JPS62264453A (en) | 1987-11-17 |
Family
ID=14472401
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP61107959A Pending JPS62264453A (en) | 1986-05-12 | 1986-05-12 | Optical recording and reproducing device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS62264453A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5467335A (en) * | 1993-01-04 | 1995-11-14 | U.S. Philips Corporation | Beam-shaping optical element and device for converting a beam having a first cross-section into a beam having a second cross-section |
-
1986
- 1986-05-12 JP JP61107959A patent/JPS62264453A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5467335A (en) * | 1993-01-04 | 1995-11-14 | U.S. Philips Corporation | Beam-shaping optical element and device for converting a beam having a first cross-section into a beam having a second cross-section |
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