JPH0193614U - - Google Patents
Info
- Publication number
- JPH0193614U JPH0193614U JP18786387U JP18786387U JPH0193614U JP H0193614 U JPH0193614 U JP H0193614U JP 18786387 U JP18786387 U JP 18786387U JP 18786387 U JP18786387 U JP 18786387U JP H0193614 U JPH0193614 U JP H0193614U
- Authority
- JP
- Japan
- Prior art keywords
- beam splitter
- polarizing beam
- information recording
- servo
- 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.)
- Pending
Links
- 230000003287 optical effect Effects 0.000 claims description 10
- 239000004065 semiconductor Substances 0.000 claims description 5
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 230000001678 irradiating effect Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 1
Landscapes
- Optical Recording Or Reproduction (AREA)
- Optical Head (AREA)
Description
第１図はこの考案の一実施例を示す平面図、第
２図は従来例を示す平面図、第３図は光デイスク
上におけるスポツト形状を示す説明図、第４図は
半導体レーザが出射方向に対して位置ズレした場
合の状態を示す説明図、第５図は半導体レーザが
出射方向と直角方向に対して位置ズレした場合の
状態を示す説明図である。
１……半導体レーザ、２……カツプリングレン
ズ、３……第一偏光ビームスプリツタ、４……１
／４波長板、５……対物レンズ、６……光情報記
録媒体、９……サーボ光学系、１０……トラツク
受光素子、１１……フオーカス受光素子、１３…
…１／２波長板、１４……第二偏光ビームスプリ
ツタ、１５……偏光プリズム、Ａ０，Ｂ０……出
射点。
Fig. 1 is a plan view showing an embodiment of this invention, Fig. 2 is a plan view showing a conventional example, Fig. 3 is an explanatory drawing showing the shape of a spot on an optical disk, and Fig. 4 shows the direction in which the semiconductor laser is emitted. FIG. 5 is an explanatory diagram showing a state when the semiconductor laser is misaligned with respect to the direction perpendicular to the emission direction. FIG. 1...Semiconductor laser, 2...Coupling lens, 3...First polarizing beam splitter, 4...1
/4 wavelength plate, 5... Objective lens, 6... Optical information recording medium, 9... Servo optical system, 10... Track light receiving element, 11... Focus light receiving element, 13...
... 1/2 wavelength plate, 14 ... second polarizing beam splitter, 15 ... polarizing prism, A 0 , B 0 ... emission point.
Claims (1)
された光をカツプリングレンズにより平行光とし
、この平行光とされた光を第一偏光ビームスプリ
ツタ、１／４波長板、対物レンズに順次透過させ
て光情報記録媒体に照射して情報の記録、再生を
行い、その光情報記録媒体からの反射光を前記第
一偏光ビームスプリツタにより反射させ、その反
射光をサーボ光学系のトラツク受光素子およびフ
オーカス受光素子に照射することにより前記光情
報記録媒体のトラツキングサーボおよびフオーカ
スサーボを行う光情報記録再生装置において、複
数個の出射点を有する前記半導体レーザの少なく
とも一つの出射点と前記カツプリングレンズとの
間に１／２波長板を設け、前記１／４波長板と前
記対物レンズとの間に第二偏光ビームスプリツタ
を設け、この第二偏光ビームスプリツタと前記第
一偏光ビームスプリツタとに近接するとともに前
記サーボ光学系と反対側に位置して偏光プリズム
を設けたことを特徴とする光ピツクアツプ装置。 Light emitted from a semiconductor laser having a plurality of emission points is made into parallel light by a coupling lens, and this parallel light is sequentially transmitted through a first polarizing beam splitter, a quarter-wave plate, and an objective lens. The beam is irradiated onto an optical information recording medium to record and reproduce information, and the reflected light from the optical information recording medium is reflected by the first polarizing beam splitter, and the reflected light is transmitted to the track light receiving element of the servo optical system and In an optical information recording and reproducing apparatus that performs tracking servo and focus servo of the optical information recording medium by irradiating a focus light receiving element, at least one emission point of the semiconductor laser having a plurality of emission points and the coupling A 1/2 wavelength plate is provided between the 1/4 wavelength plate and the objective lens, a second polarizing beam splitter is provided between the 1/4 wavelength plate and the objective lens, and the second polarizing beam splitter and the first polarizing beam splitter An optical pickup device characterized in that a polarizing prism is provided close to the ivy and on the opposite side from the servo optical system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18786387U JPH0193614U (en) | 1987-12-10 | 1987-12-10 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18786387U JPH0193614U (en) | 1987-12-10 | 1987-12-10 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0193614U true JPH0193614U (en) | 1989-06-20 |
Family
ID=31478993
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18786387U Pending JPH0193614U (en) | 1987-12-10 | 1987-12-10 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0193614U (en) |
-
1987
- 1987-12-10 JP JP18786387U patent/JPH0193614U/ja active Pending
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