JPS62101125U - - Google Patents
Info
- Publication number
- JPS62101125U JPS62101125U JP19327485U JP19327485U JPS62101125U JP S62101125 U JPS62101125 U JP S62101125U JP 19327485 U JP19327485 U JP 19327485U JP 19327485 U JP19327485 U JP 19327485U JP S62101125 U JPS62101125 U JP S62101125U
- Authority
- JP
- Japan
- Prior art keywords
- optical
- recording
- utility
- reproducing device
- semiconductor laser
- 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 29
- 239000004065 semiconductor Substances 0.000 claims description 9
- 238000002834 transmittance Methods 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 claims 1
- 230000000694 effects Effects 0.000 claims 1
- 230000001678 irradiating effect Effects 0.000 claims 1
- 239000004973 liquid crystal related substance Substances 0.000 claims 1
- 238000000034 method Methods 0.000 claims 1
- 230000007935 neutral effect Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 6
- 238000000295 emission spectrum Methods 0.000 description 3
Landscapes
- Optical Head (AREA)
Description
第１図は本考案に係る光学式記録再生装置の概
略構成図で、第２図のＡは記録時における半導体
レーザの発光スペクトル図、第２図のＢは再生時
における半導体レーザの発光スペクトル図、第３
図のＡは本考案の光学式記録再生装置に使用され
る光フイルタの特性、第３図のＢは同光フイルタ
の透過後の発光スペクトル図、第４図は半導体レ
ーザのＩ―Ｐ特性、第５図は本考案の光学式記録
再生装置の他の実施例を示す光シヤツタ装置の構
成図、第６図は同光シヤツタ装置の特性、第７図
は同光シヤツタ装置の透過率、印加電圧、コント
ロール信号の関係図、第８図は従来の光学式記録
再生装置の概略構成図を示す。
１……情報記録媒体、２……半導体レーザ、４
……光フイルタ、５……偏光ビームスプリツタ、
７……対物レンズ、９……光検出器、１０……電
気光学素子、１１……電圧印加装置、１２……偏
光フイルタ。
FIG. 1 is a schematic configuration diagram of an optical recording/reproducing device according to the present invention, A in FIG. 2 is an emission spectrum diagram of a semiconductor laser during recording, and B in FIG. 2 is an emission spectrum diagram of a semiconductor laser during reproduction. , 3rd
A in the figure shows the characteristics of the optical filter used in the optical recording/reproducing device of the present invention, B in FIG. 3 shows the emission spectrum after passing through the optical filter, and FIG. 4 shows the IP characteristics of the semiconductor laser. Fig. 5 is a block diagram of an optical shutter device showing another embodiment of the optical recording/reproducing device of the present invention, Fig. 6 is the characteristics of the optical shutter device, and Fig. 7 is the transmittance and applied voltage of the optical shutter device. FIG. 8 is a diagram showing the relationship between voltage and control signals, and shows a schematic configuration diagram of a conventional optical recording/reproducing device. 1... Information recording medium, 2... Semiconductor laser, 4
...Optical filter, 5...Polarizing beam splitter,
7...Objective lens, 9...Photodetector, 10...Electro-optical element, 11...Voltage application device, 12...Polarizing filter.
Claims (1)
光学レンズ系により微小径に絞つて情報記録媒体
に照射することにより、情報を記録または再生す
る光学式記録再生装置において、半導体レーザか
ら情報記録媒体に至る光路中に光フイルタを設置
し、この光フイルタにより再生時に半導体レーザ
の動作点を上げると共に、光学系の透過率を下げ
るようにしたことを特徴とする光学式記録再生装
置。 (2) 光フイルタとして中心透過波長を記録時の
半導体レーザの中心波長と一致させた光学的帯域
通過フイルタにしたことを特徴とする実用新案登
録請求の範囲第１項記載の光学式記録再生装置。 (3) 光学的帯域通過フイルタの通過帯域を記録
時の半導体レーザの中心±５ｎｍ（半値幅１０ｎ
ｍ）であることを特徴とする実用新案登録請求の
範囲第１項または第２項記載の光学式記録再生装
置。 (4) 電気光学素子を用いて再生時のみ透過率を
下げることを特徴とする実用新案登録請求の範囲
第１項記載の光学式記録再生装置。 (5) 液晶の電気光学効果を用いて再生時のみ透
過率を下げることを特徴とする実用新案登録請求
の範囲第１項記載の光学式記録再生装置。 (6) 光路中に挿入したＮＤ（ｎｅｕｔｒａｌ
ｄｅｎｓｉｔｙ ｆｉｌｔｅｒ）フイルタを再生
時と記録時とで機械的に切換えて再生時に透過率
を下げることを特徴とする実用新案登録請求の範
囲第１項記載の光学式記録再生装置。 (7) 光路中に挿入した偏光フイルタを再生時と
記録時とで機械的に回転させ、再生時に透過率を
下げることを特徴とする実用新案登録請求の範囲
第１項記載の光学式記録再生装置。[Claims for Utility Model Registration] (1) An optical recording and reproducing device that records or reproduces information by using a semiconductor laser as a light source and focusing its output light to a minute diameter using an optical lens system and irradiating it onto an information recording medium. An optical system characterized in that an optical filter is installed in the optical path from the semiconductor laser to the information recording medium, and the optical filter raises the operating point of the semiconductor laser during reproduction and lowers the transmittance of the optical system. type recording and reproducing device. (2) The optical recording and reproducing device according to claim 1 of the utility model registration claim, characterized in that the optical filter is an optical bandpass filter whose center transmission wavelength matches the center wavelength of a semiconductor laser during recording. . (3) The passband of the optical bandpass filter is set to ±5nm from the center of the semiconductor laser at the time of recording (half-width: 10nm).
m) The optical recording and reproducing device according to claim 1 or 2 of the utility model registration claim. (4) The optical recording and reproducing device according to claim 1, which is a utility model and is characterized in that the transmittance is reduced only during reproduction by using an electro-optical element. (5) The optical recording and reproducing device according to claim 1, which is a utility model, and is characterized in that the electro-optic effect of liquid crystal is used to reduce transmittance only during reproduction. (6) ND (neutral) inserted in the optical path
2. The optical recording and reproducing apparatus according to claim 1, wherein the optical recording and reproducing apparatus is characterized in that the filter is mechanically switched between reproduction and recording to lower transmittance during reproduction. (7) The optical recording and reproducing method according to claim 1 of the utility model registration claim, characterized in that a polarizing filter inserted in the optical path is mechanically rotated during reproduction and recording to lower transmittance during reproduction. Device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19327485U JPS62101125U (en) | 1985-12-16 | 1985-12-16 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19327485U JPS62101125U (en) | 1985-12-16 | 1985-12-16 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62101125U true JPS62101125U (en) | 1987-06-27 |
Family
ID=31149147
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19327485U Pending JPS62101125U (en) | 1985-12-16 | 1985-12-16 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62101125U (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60214432A (en) * | 1984-04-09 | 1985-10-26 | Olympus Optical Co Ltd | Optical information recording and reproducing device |
-
1985
- 1985-12-16 JP JP19327485U patent/JPS62101125U/ja active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60214432A (en) * | 1984-04-09 | 1985-10-26 | Olympus Optical Co Ltd | Optical information recording and reproducing device |
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