JPH0467452A - Optical information recording/reproducing device - Google Patents
Optical information recording/reproducing deviceInfo
- Publication number
- JPH0467452A JPH0467452A JP2180791A JP18079190A JPH0467452A JP H0467452 A JPH0467452 A JP H0467452A JP 2180791 A JP2180791 A JP 2180791A JP 18079190 A JP18079190 A JP 18079190A JP H0467452 A JPH0467452 A JP H0467452A
- Authority
- JP
- Japan
- Prior art keywords
- light
- receiving element
- light receiving
- information recording
- optical information
- 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 52
- 238000000926 separation method Methods 0.000 claims description 31
- 230000010287 polarization Effects 0.000 claims description 27
- 230000001678 irradiating effect Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 6
- 238000001514 detection method Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000011295 pitch Substances 0.000 description 3
- 230000005374 Kerr effect Effects 0.000 description 2
- 238000005286 illumination Methods 0.000 description 2
- 239000013585 weight reducing agent Substances 0.000 description 2
- 201000009310 astigmatism Diseases 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000000758 substrate 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、レーザ光源から出射された光を光ディスク等
の光情報記録媒体に照射することにより情報の記録や再
生等を行う光情報記録再生装置に関する。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an optical information recording and reproducing apparatus that records and reproduces information by irradiating light emitted from a laser light source onto an optical information recording medium such as an optical disk. .
従来の技術
従来における光情報記録再生装置としては、例えば、特
開昭６３−２２８４２３号公報に開示されているものが
ある。そこで、今、これを第７図ないし第９図に基づい
て説明する。レーザ光源ｌから出射された光はビームス
プリッタ２を透過し。BACKGROUND OF THE INVENTION A conventional optical information recording/reproducing apparatus is disclosed, for example, in Japanese Patent Application Laid-Open No. 63-228423. Therefore, this will now be explained based on FIGS. 7 to 9. The light emitted from the laser light source 1 passes through the beam splitter 2.
対物レンズ３により集光され光情報記録媒体としての光
磁気ディスク４の面上に照射され、これにより情報の記
録等を行うことができる。また、その光磁気ディスク４
からの情報を読取りカー効果による偏光の回転を受けた
光は、再び、ビームスプリッタ２に入射することにより
今度は反射され、１／２波長板５により４５°の偏光回
転を受け、分離プリズム６に入射する。The light is focused by the objective lens 3 and irradiated onto the surface of a magneto-optical disk 4 as an optical information recording medium, thereby making it possible to record information. In addition, the magneto-optical disk 4
The light, which has undergone polarization rotation due to the Kerr effect, enters the beam splitter 2 again and is reflected, undergoes a 45° polarization rotation by the 1/2 wavelength plate 5, and then passes through the separation prism 6. incident on .
この分離プリズム６は、第８図に示すように、台形状を
なしており、２つの偏光分離膜７，８と１つの全反射面
９とが一体化して形成されたものとなっている。そして
、光磁気ディスク４からの反射光は分離プリズム６の偏
光分離膜７，８に入射するようになっており、これによ
りＳ偏光（反射光）ＫとＰ偏光（透過光）Ｔとに分離さ
れる。As shown in FIG. 8, this separating prism 6 has a trapezoidal shape, and is formed by integrating two polarized light separating films 7 and 8 and one total reflection surface 9. The reflected light from the magneto-optical disk 4 enters the polarization separation films 7 and 8 of the separation prism 6, thereby separating it into S-polarized light (reflected light) K and P-polarized light (transmitted light) T. be done.
この場合、Ｓ偏光には偏光分離膜８で反射され全反射面
９で反射されて受光素子１０に受光されるものと、偏光
分離膜７で反射された後、さらに、偏光分離膜８で再反
射されて受光素子１１に受光されるものとに分離される
。一方、Ｐ偏光下は偏光分離膜７，８を共に透過し、受
光素子１２で受光される。これら３つの受光素子１０，
１１．１２は同一基板１３上に配設されている。In this case, the S-polarized light includes one that is reflected by the polarization separation film 8, reflected by the total reflection surface 9, and received by the light receiving element 10, and another that is reflected by the polarization separation film 7 and then re-received by the polarization separation film 8. The light is reflected and received by the light receiving element 11. On the other hand, the P-polarized light passes through both the polarization separation films 7 and 8 and is received by the light receiving element 12. These three light receiving elements 10,
11 and 12 are arranged on the same substrate 13.
ここで、受光素子１２の受光面をａ、２分割された受光
素子１１の受光面をす、ｃ、２分割された受光素子１０
の受光面をｄ、ｅとすると、光磁気信号ＭＯ、フォーカ
スエラー信号ＦＯ、トラックエラー信号Ｔｒの各種信号
の値は、
Ｍｏ＝ａ−（（ｂ＋ｃ）＋（ｄ＋ｅ））Ｆｏ＝ （ｂ−
ｃ）＋ （ｄ−ｅ）
Ｔｒ＝ （ｂ＋ｃ）−（ｄ＋ｅ）
により求めることができる。Here, the light-receiving surface of the light-receiving element 12 is a, the light-receiving surface of the light-receiving element 11 divided into two is
Let d and e be the light-receiving surfaces of
c)+(de-e)Tr=(b+c)-(d+e)
発明が解決しようとする課題
このような構成とすることによって各種信号の検出を行
うことができ、これにより部品点数を少なくして小型、
軽量な装置を得ることが可能となる。しかし、レーザ光
源１と、３つの受光素子ＩＯ，１１，１２とは互いに離
れた位置に設けられているため、その光学系のレイアウ
トの関係上、十分な小型化を図ることができないという
問題がある。Problems to be Solved by the Invention With this configuration, various signals can be detected, which reduces the number of parts and makes it compact and compact.
It becomes possible to obtain a lightweight device. However, since the laser light source 1 and the three light-receiving elements IO, 11, and 12 are located apart from each other, there is a problem that sufficient miniaturization cannot be achieved due to the layout of the optical system. be.
課題を解決するための手段
そこで、このような問題点を解決するために、本発明は
、レーザ光源から出射された光を対物レンズにより集光
して光情報記録媒体の面上に照射することにより情報の
記録や再生等を行う光情報記録再生装置において、前記
レーザ光源から出射された光が前記光情報記録媒体に向
かう間の光路上に前記レーザ光源からの光と前記光情報
記録媒体からの反射光とを分離するビームスプリッタ手
段とこのビームスプリッタ手段により分離された光束を
偏光分離する偏光分離手段とこの偏光分離手段により偏
光分離された後の少なくとも一つの光束を反射する全反
射面とを一体化してなる分離プリズムを配設し、前記偏
光分離手段により反射された光束を受光する第一受光素
子を設け、前記偏光分離手段を透過し前記全反射面によ
り反射された光束を受光する第二受光素子を設け、前記
第一受光素子及び前記第二受光素子の受光端面と前記レ
ーザ光源の８射端面とが平行となるように互いに近接さ
せて配置した。Means for Solving the Problems Therefore, in order to solve such problems, the present invention focuses light emitted from a laser light source using an objective lens and irradiates it onto the surface of an optical information recording medium. In an optical information recording and reproducing apparatus that records and reproduces information, the light from the laser light source and the light from the optical information recording medium are on an optical path between the light emitted from the laser light source and the optical information recording medium. a beam splitter means for separating the reflected light from the beam splitter; a polarization separation means for polarizing the light beam separated by the beam splitter means; and a total reflection surface for reflecting at least one light beam after being polarized by the polarization separation means. A first light receiving element is provided to receive the light beam reflected by the polarization separation means, and a first light receiving element is provided to receive the light beam transmitted through the polarization separation means and reflected by the total reflection surface. A second light receiving element was provided, and the light receiving end faces of the first light receiving element and the second light receiving element were arranged close to each other so that the light receiving end faces of the laser light source were parallel to each other.
作用
これにより、レーザ光源から光情報記録媒体に向かう間
の照明光学系と光情報記録媒体から受光素子の間の検出
光学系とが一体化され、しかも、レーザ光源と受光素子
とは近接して配置されているため、その光学系のレイア
ウトを縮小させることが可能となり、これにより装置全
体の構成の小型化、軽量化、さらには、低コスト化を図
ることができる。As a result, the illumination optical system from the laser light source to the optical information recording medium and the detection optical system between the optical information recording medium and the light receiving element are integrated, and the laser light source and the light receiving element are located close to each other. Because of this arrangement, it is possible to reduce the layout of the optical system, thereby making it possible to reduce the size, weight, and cost of the entire device.
実施例
本発明の第一の実施例を第１図及び第２図に基づいて説
明する。まず、本装置の全体構成を第１図に基づいて述
べる。光学素子１４内部の基台１５上にはレーザ光源１
６が設けられている。このレーザ光源１６から出射され
た光が図示しない光情報記録媒体としての光磁気ディス
クに向かう間の光路上には、分離プリズム１７中に埋設
されたビームスプリッタ手段としての半透過層Ｉ８が設
けられている。また、前記光磁気ディスクからの反射光
が前記半透過層１８により反射された光路上には偏光分
離手段としての偏光膜１９が配置されており、この偏光
膜１９を透過した光の光路上には全反射面２０が配設さ
れている。この場合、前記半透過層１８と前記偏光膜１
９と前記全反射膜２０とは、台形状をなす前記分離プリ
ズム１７により一体化して構成されている。Embodiment A first embodiment of the present invention will be explained based on FIGS. 1 and 2. First, the overall configuration of this device will be described based on FIG. A laser light source 1 is mounted on the base 15 inside the optical element 14.
6 is provided. A semi-transparent layer I8 as a beam splitter means embedded in the separation prism 17 is provided on the optical path of the light emitted from the laser light source 16 toward a magneto-optical disk as an optical information recording medium (not shown). ing. Further, a polarizing film 19 as a polarization separating means is arranged on the optical path where the light reflected from the magneto-optical disk is reflected by the semi-transparent layer 18, and on the optical path of the light transmitted through this polarizing film 19. A total reflection surface 20 is provided. In this case, the semi-transparent layer 18 and the polarizing film 1
9 and the total reflection film 20 are integrated by the trapezoidal separating prism 17.
また、前記分離プリズム１７は前記基台１５上に設けら
れた支持台２１に取付けられており、前記偏光膜１９に
より反射された光の光路上に位置する前記支持台２１の
一面には第一受光素子としての３分割受光素子２２が配
設され、また、前記全反射面２０により反射された光の
光路上に位置する前記支持台２１の一面には第二受光素
子としての３分割受光素子２３が配設されている。The separation prism 17 is attached to a support 21 provided on the base 15, and a first surface of the support 21 located on the optical path of the light reflected by the polarizing film 19 has a A three-part light receiving element 22 as a light receiving element is disposed, and a three part light receiving element as a second light receiving element is disposed on one surface of the support base 21 located on the optical path of the light reflected by the total reflection surface 20. 23 are arranged.
この場合、前記３分割受光素子２２及び前記３分割受光
素子２３の受光端面と、前記レーサ′光源１６の出射端
面とは平行となるように互いに近接して配置されている
。なお、前記分離プリズム１７と前記光磁気ディスクと
の間の光路上には、図示しない対物レンズが配設されて
いる。In this case, the light-receiving end faces of the three-part light receiving element 22 and the three-part light receiving element 23 and the emission end face of the laser' light source 16 are arranged close to each other so as to be parallel to each other. Note that an objective lens (not shown) is disposed on the optical path between the separation prism 17 and the magneto-optical disk.
このような構成において、レーザ光源１６から出射され
た光は、分離プリズム１７中の半透過層１８を透過して
、対物レンズにより集光されることにより光磁気ディス
クの面上に照射され、これにより情報の記録が行われる
。また、光磁気ディスクからの情報を読取りカー効果に
よる偏光の回転を受けた反射光は、再び、半透過層１８
に入射し今度はこれにより反射され偏光膜１９に入射す
る。この偏光膜１９に入射した光は偏光分離され、Ｓ偏
光にとＰ偏光下とに分けられる。In such a configuration, the light emitted from the laser light source 16 passes through the semi-transparent layer 18 in the separation prism 17, is focused by the objective lens, and is irradiated onto the surface of the magneto-optical disk. Information is recorded by. Further, the reflected light that has read information from the magneto-optical disk and has undergone rotation of polarization due to the Kerr effect is returned to the semi-transparent layer 18.
The light enters the polarizing film 19, is reflected by the light, and enters the polarizing film 19. The light incident on this polarizing film 19 is polarized and separated into S-polarized light and P-polarized light.
その偏光膜１９により反射されたＳ偏光にはその集光点
よりも手前の状態で３分割受光素子２２に受光され、一
方、透過したＰ偏光下は全反射面２０により反射された
後、その集光点の後方の状態で３分割受光素子２３に受
光される。この時、３分割受光素子２２の受光面をａ、
ｂ、ｃとし、３分割受光素子２３の受光面をｄ、ｅ、ｆ
とすると、光磁気信号Ｍｏ、フォーカスエラー信号Ｆｏ
、トラックエラー信号Ｔｒは、
Ｍｏ＝（ａ＋ｂ＋ｃ）−（ｄ＋ｅ＋ｆ）Ｆｏ＝（ｂ−（
ａ＋ｃ））−（ｅ−（ｄ＋ｆ））Ｔｒ＝ （ａ＋ｄ）−
（ｃ＋ｆ）
により求めることができる。The S-polarized light reflected by the polarizing film 19 is received by the 3-split light receiving element 22 in front of its condensing point, while the transmitted P-polarized light is reflected by the total reflection surface 20 and then The light is received by the three-split light receiving element 23 in a state behind the condensing point. At this time, the light-receiving surface of the three-split light-receiving element 22 is a,
b, c, and the light receiving surfaces of the three-part light receiving element 23 are d, e, f.
Then, the magneto-optical signal Mo, the focus error signal Fo
, the track error signal Tr is as follows:Mo=(a+b+c)-(d+e+f)Fo=(b-(
a+c))-(e-(d+f))Tr= (a+d)-
It can be determined by (c+f).
上述したように、８肘光学系と検出光学系とを兼ねた半
透過層１８と偏光膜１９と全反射面２０とが一体化され
た分離プリズム１７を設け、しかも、３分割受光素子２
２及び３分割受光素子２３の受光端面とレーザ光源１６
の８射端面とを平行にした状態で互いに近接させて配設
したことによって、光学系全体のレイアウトの縮小化を
図ることが可能となり、これにより、−段と小型で軽量
な光磁気ヘッドを得ることができる。また、光路差の関
係上、レーザ光源１６と３分割受光素子２２．２３とを
同一面ではなく多少能れた位置に配設したことによって
、熱などによる雑音の悪影響を除去することも可能とな
る。As described above, the separation prism 17 is provided in which the semi-transparent layer 18, the polarizing film 19, and the total reflection surface 20 are integrated, which also serves as the eight-element optical system and the detection optical system, and the three-part light receiving element 2 is provided.
Light-receiving end faces of two- and three-split light-receiving elements 23 and laser light source 16
By arranging the 8-emitting end faces parallel to each other and close to each other, it is possible to reduce the layout of the entire optical system, which makes it possible to create a magneto-optical head that is much smaller and lighter. Obtainable. Furthermore, due to the optical path difference, the laser light source 16 and the three-split light receiving elements 22 and 23 are not placed on the same plane, but are placed at slightly different positions, thereby making it possible to eliminate the negative effects of noise caused by heat and the like. Become.
次に、本発明の第二の実施例を第３図ないし第５図に基
づいて説明する。ここでは、偏光分離手段として、前述
したような偏光膜１９を用いる代わりに、回折格子２４
を設けたものである。その回折格子２４は、第４図に示
すように、境界線２５を境にしてピッチの異なる２つの
格子２４ａ。Next, a second embodiment of the present invention will be described based on FIGS. 3 to 5. Here, instead of using the polarizing film 19 as described above, a diffraction grating 24 is used as the polarization separation means.
It has been established. As shown in FIG. 4, the diffraction grating 24 has two gratings 24a having different pitches with a boundary line 25 as a boundary.
２４ｂにより形成されている。24b.
これにより、光磁気ディスクからの反射光は、その回折
効率が偏光依存性をもつ回折格子２４に入射し、Ｓ偏光
（回折光）ＫとＰ偏光（透過光）Ｔとに偏光分離される
。この場合、回折格子２４はピッチが異なるように設定
されているため、Ｓ偏光にはビーム分割され２つの光と
なる。その結果、２つのＳ偏光には第一受光素子として
の４分割受光素子２５に検出され、１つのＰ偏光下は全
反射面２０により反射された後、第二次受光素子として
の無分割受光素子２６に検出される。As a result, the reflected light from the magneto-optical disk enters the diffraction grating 24 whose diffraction efficiency is polarization dependent, and is polarized into S-polarized light (diffraction light) K and P-polarized light (transmitted light) T. In this case, since the diffraction gratings 24 are set to have different pitches, the S-polarized light is beam-split into two lights. As a result, the two S-polarized lights are detected by the four-split light-receiving element 25 as the first light-receiving element, and the one P-polarized light is detected by the total reflection surface 20, and is then detected by the undivided light-receiving element as the second light-receiving element. It is detected by element 26.
この場合、第５図に示すように、無分割受光素子２６の
受光面をｇと腰４分割受光素子２５の受光面をｈ＋
１＋ Ｊ＋ ｋとすると、光磁気信号Ｍｏ、フォーカ
スエラー信号ＦＯ、トラックエラー信号Ｔｒは、
Ｍ○＝ｇ−（ｈ＋ｉ＋ｊ＋ｋ）
Ｆｏ＝ （ｈ＋ｋ） （ｉ＋ｊ）
Ｔｒ＝ （ｈ＋ｉ） （ｊ＋ｋ）
により求めることができる。In this case, as shown in FIG.
1+J+k, the magneto-optical signal Mo, focus error signal FO, and track error signal Tr can be obtained as follows: M○=g-(h+i+j+k) Fo= (h+k) (i+j) Tr= (h+i) (j+k) can.
上述したように、回折格子２４を設けることによって偏
光分離とビーム分割とを１つの素子で行うことが可能と
なるため、これにより複合機能化による一層の小型化、
軽量化を図ることが可能となる。また、回折格子２４を
透過する光はその格子を２回通過するため、回折格子２
４自体がもつ欠点である波長変動による回折角度ずれを
キャンセルすることが可能となり、これにより常に安定
した信号検出を行うことができる。As mentioned above, by providing the diffraction grating 24, it becomes possible to perform polarization separation and beam splitting with one element.
It becomes possible to achieve weight reduction. Furthermore, since the light transmitted through the diffraction grating 24 passes through the grating twice, the diffraction grating 24
It becomes possible to cancel the diffraction angle deviation due to wavelength fluctuation, which is a drawback of the method 4 itself, and thereby it is possible to always perform stable signal detection.
また、本実施例では、上下に２分割された格子を例にと
ったが、この他に、第６図に示すような変調ピッチ回折
格子２６を設けて非点収差法やブシュプル法により信号
検出を行うなど、格子形状を変えることによっても前述
した場合と同様な効果を得ることができる。Furthermore, in this embodiment, a grating divided into upper and lower halves is taken as an example, but in addition to this, a modulation pitch diffraction grating 26 as shown in FIG. 6 is provided for signal detection using the astigmatism method or bush-pull method. Effects similar to those described above can also be obtained by changing the grid shape.
発明の効果
本発明は、レーザ光源から出射された光を対物レンズに
より集光して光情報記録媒体の面上に照射することによ
り情報の記録や再生等を行う光情報記録再生装置におい
て、前記レーザ光源から出射された光が前記光情報記録
媒体に向かう間の光路上に前記レーザ光源からの光と前
記光情報記録媒体からの反射光とを分離するビームスプ
リッタ手段とこのビームスプリッタ手段により分離され
た光束を偏光分離する偏光分離手段とこの偏光分離手段
により偏光分離された後の少なくとも一つの光束を反射
する全反射面とを一体化してなる分離プリズムを配設し
、前記偏光分離手段により反射された光束を受光する第
一受光素子を設け、前記偏光分離手段を透過し前記全反
射面により反射された光束を受光する第二受光素子を設
け、前記第一受光素子及び前記第二受光素子の受光端面
と前記レーザ光源の出射端面とが平行となるように互い
に近接させて配置したので、レーザ光源から光情報記録
媒体に向かう間の照明光学系と光情報記録媒体から受光
素子の間の検出光学系とが一体化され、しかも、レーザ
光源と受光素子とは近接して配置されているため、その
光学系のレイアウトを縮小させることが可能となり、こ
れにより装置全体の構成の小型化、軽量化、さらには、
低コスト化を図るとこができるものである。Effects of the Invention The present invention provides an optical information recording and reproducing apparatus that records and reproduces information by condensing light emitted from a laser light source using an objective lens and irradiating it onto the surface of an optical information recording medium. A beam splitter means for separating the light from the laser light source and the reflected light from the optical information recording medium on the optical path of the light emitted from the laser light source toward the optical information recording medium; and the beam splitter means separates the light from the laser light source and the reflected light from the optical information recording medium. A separating prism is provided which integrates a polarization separation means for polarizing and separating the polarized light beam, and a total reflection surface for reflecting at least one light beam after being polarized and separated by the polarization separation means. a first light receiving element for receiving the reflected light beam; a second light receiving element for receiving the light beam transmitted through the polarization separation means and reflected by the total reflection surface; Since the light-receiving end face of the element and the emitting end face of the laser light source are arranged close to each other so as to be parallel to each other, there is a gap between the illumination optical system from the laser light source to the optical information recording medium and the space between the optical information recording medium and the light-receiving element. Since the detection optical system is integrated, and the laser light source and light receiving element are placed close to each other, it is possible to reduce the layout of the optical system, thereby reducing the overall configuration of the device. , weight reduction, and even
This can be achieved by reducing costs.
第１図は本発明の第一の実施例を示す構成図、第２図は
その受光素子の形状を示す正面図、第３図は本発明の第
二の実施例を示す構成図、第４図はその偏光分離手段に
入射するビームが分割される様子を示す説明図、第５図
は受光素子の形状を示す正面図、第６図は第４図の偏光
分離手段の変形例を示す正面図、第７図は従来例を示す
構成図、第８図はその各種機能を有する素子が一体化し
て形成された分離プリズムの様子を示す構成図、第９図
は従来の受光素子の形状を示す正面図である。
１６・・・レーザ光源、１７・・・分離プリズム、１８
・・・ビームスプリッタ手段、１９・・・偏光分離手段
、２ｏ・・・全反射面、２２・・・第一受光素子、２３
・・・第二受光素子、２４・・・偏光分離手段、２５・
・・第一受光素子、２６・・・第二受光素子
出 願 人 株式会社 リ コ
〔二冒
図
図
図
図
（ａ）
（ｂ）
図FIG. 1 is a block diagram showing a first embodiment of the present invention, FIG. 2 is a front view showing the shape of the light receiving element, FIG. 3 is a block diagram showing a second embodiment of the present invention, and FIG. The figure is an explanatory diagram showing how the beam incident on the polarization separation means is split, Figure 5 is a front view showing the shape of the light receiving element, and Figure 6 is a front view showing a modification of the polarization separation means in Figure 4. 7 is a configuration diagram showing a conventional example, FIG. 8 is a configuration diagram showing a separation prism formed by integrating elements with various functions, and FIG. 9 is a configuration diagram showing the shape of a conventional light receiving element. FIG. 16... Laser light source, 17... Separation prism, 18
...Beam splitter means, 19...Polarization separation means, 2o...Total reflection surface, 22...First light receiving element, 23
. . . second light receiving element, 24 . . . polarization separation means, 25.
...First light-receiving element, 26...Second light-receiving element Applicant: Ricoh Co., Ltd.
Claims (1)
て光情報記録媒体の面上に照射することにより情報の記
録や再生等を行う光情報記録再生装置において、前記レ
ーザ光源から出射された光が前記光情報記録媒体に向か
う間の光路上に前記レーザ光源からの光と前記光情報記
録媒体からの反射光とを分離するビームスプリッタ手段
とこのビームスプリッタ手段により分離された光束を偏
光分離する偏光分離手段とこの偏光分離手段により偏光
分離された後の少なくとも一つの光束を反射する全反射
面とを一体化してなる分離プリズムを配設し、前記偏光
分離手段により反射された光束を受光する第一受光素子
を設け、前記偏光分離手段を透過し前記全反射面により
反射された光束を受光する第二受光素子を設け、前記第
一受光素子及び前記第二受光素子の受光端面と前記レー
ザ光源の出射端面とが平行となるように互いに近接させ
て配置したことを特徴とする光情報記録再生装置。In an optical information recording and reproducing device that records and reproduces information by condensing the light emitted from a laser light source with an objective lens and irradiating it onto the surface of an optical information recording medium, the light emitted from the laser light source beam splitter means for separating the light from the laser light source and the reflected light from the optical information recording medium on the optical path while the light beam heads toward the optical information recording medium; and a beam splitter means for polarizing and splitting the light beam separated by the beam splitter means. A separating prism is provided that integrates a polarization separation means and a total reflection surface that reflects at least one light beam after being polarized and separated by the polarization separation means, and receives the light beam reflected by the polarization separation means. A first light-receiving element is provided, a second light-receiving element is provided that receives a beam transmitted through the polarization separation means and reflected by the total reflection surface, and the light-receiving end face of the first light-receiving element and the second light-receiving element and the laser An optical information recording/reproducing device characterized in that the light sources are arranged close to each other so that the emission end surfaces of the light sources are parallel to each other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2180791A JP2793334B2 (en) | 1990-07-09 | 1990-07-09 | Optical information recording / reproducing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2180791A JP2793334B2 (en) | 1990-07-09 | 1990-07-09 | Optical information recording / reproducing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0467452A true JPH0467452A (en) | 1992-03-03 |
| JP2793334B2 JP2793334B2 (en) | 1998-09-03 |
Family
ID=16089395
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2180791A Expired - Fee Related JP2793334B2 (en) | 1990-07-09 | 1990-07-09 | Optical information recording / reproducing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2793334B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0866448A1 (en) * | 1997-03-19 | 1998-09-23 | Fujitsu Limited | Optical pickup |
-
1990
- 1990-07-09 JP JP2180791A patent/JP2793334B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0866448A1 (en) * | 1997-03-19 | 1998-09-23 | Fujitsu Limited | Optical pickup |
| US5881043A (en) * | 1997-03-19 | 1999-03-09 | Fujitsu Limited | Optical pickup with a first detector to receive reflected data component signal and a second detector to receive reflected other component signal |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2793334B2 (en) | 1998-09-03 |
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