JPS6313415U - - Google Patents
Info
- Publication number
- JPS6313415U JPS6313415U JP10783586U JP10783586U JPS6313415U JP S6313415 U JPS6313415 U JP S6313415U JP 10783586 U JP10783586 U JP 10783586U JP 10783586 U JP10783586 U JP 10783586U JP S6313415 U JPS6313415 U JP S6313415U
- Authority
- JP
- Japan
- Prior art keywords
- light
- recording medium
- reflected
- spot
- beam splitter
- 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 12
- 238000001514 detection method Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
Landscapes
- Optical Head (AREA)
- Optical Recording Or Reproduction (AREA)
Description
第１図は本考案に係る光情報記録再生装置の実
施例を示す光学配置図、第２図は同上実施例にお
けるフオーカス検出系の部分を等価的に示す光学
配置図、第３図は本考案に適用可能な変形例を示
す光学配置図、第４図は従来の光情報記録再生装
置の例を示す光学配置図、第５図は従来の光情報
記録再生装置に用いられるビーム整形光学系の例
を示す光学配置図である。
２１……レーザ光源としての半導体レーザ、２
２……偏光ビームスプリツタ、２３……集光レン
ズ、２５……対物レンズ、２６……光情報記録媒
体、２７……ナイフエツジ、２８……凹レンズ、
３０……フオーカス検出用受光素子。
FIG. 1 is an optical layout diagram showing an embodiment of the optical information recording/reproducing apparatus according to the present invention, FIG. 2 is an optical layout diagram equivalently showing the focus detection system part in the same embodiment, and FIG. FIG. 4 is an optical layout diagram showing an example of a conventional optical information recording/reproducing device, and FIG. 5 is an optical layout diagram showing a modification example applicable to the conventional optical information recording/reproducing device. FIG. 3 is an optical layout diagram showing an example. 21... Semiconductor laser as a laser light source, 2
2... Polarizing beam splitter, 23... Condensing lens, 25... Objective lens, 26... Optical information recording medium, 27... Knife edge, 28... Concave lens,
30... Light receiving element for focus detection.
Claims (1)
なスポツトとして集光させて上記記録媒体に情報
信号を記録し、あるいは上記光スポツトの反射光
を受光して記録情報信号を再生するようにした光
情報記録再生装置において、記録媒体への照射光
と記録媒体からの反射光とを分離する偏光ビーム
スプリツタと対物レンズとの間に集光レンズを配
置してレーザ光源からの光束を平行光束とすると
共に上記対物レンズで上記記録媒体に微小な光ス
ポツトを形成するようにし、上記偏光ビームスプ
リツタで導かれる上記反射光の通路にフオーカス
検出用受光素子を配置し、上記偏光ビームスプリ
ツタと受光素子との間にナイフエツジと凹レンズ
を配置したことを特徴とする光情報記録再生装置
。 A beam of light from a laser light source is focused on an optical information recording medium as a minute spot to record an information signal on the recording medium, or a beam of light reflected from the optical spot is received to reproduce the recorded information signal. In an information recording/reproducing device, a condenser lens is placed between a polarizing beam splitter that separates light irradiated onto a recording medium and light reflected from the recording medium and an objective lens to convert a light beam from a laser light source into a parallel light beam. At the same time, a minute light spot is formed on the recording medium by the objective lens, and a focus detection light receiving element is arranged in the path of the reflected light guided by the polarizing beam splitter, and the light receiving element is arranged in the path of the reflected light guided by the polarizing beam splitter. An optical information recording/reproducing device characterized in that a knife edge and a concave lens are arranged between an element and a concave lens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10783586U JPS6313415U (en) | 1986-07-14 | 1986-07-14 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10783586U JPS6313415U (en) | 1986-07-14 | 1986-07-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6313415U true JPS6313415U (en) | 1988-01-28 |
Family
ID=30984479
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10783586U Pending JPS6313415U (en) | 1986-07-14 | 1986-07-14 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6313415U (en) |
-
1986
- 1986-07-14 JP JP10783586U patent/JPS6313415U/ja active Pending
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