JPH0310321U - - Google Patents
Info
- Publication number
- JPH0310321U JPH0310321U JP6949989U JP6949989U JPH0310321U JP H0310321 U JPH0310321 U JP H0310321U JP 6949989 U JP6949989 U JP 6949989U JP 6949989 U JP6949989 U JP 6949989U JP H0310321 U JPH0310321 U JP H0310321U
- Authority
- JP
- Japan
- Prior art keywords
- laser beam
- optical
- incident
- objective lens
- 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 12
- 239000004065 semiconductor Substances 0.000 claims description 5
- 238000007493 shaping process Methods 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 9
- 230000005855 radiation Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 1
Landscapes
- Optical Head (AREA)
Description
第１図は本考案の一実施例に係る光学式ピツク
アツプの部品配置図、第２図は本考案に係る光学
部品の拡大図、第３図は本考案の他の実施例の説
明図、第４図は従来のポータブル用あるいは車載
用の薄型光学式ピツクアツプの部品配置図、第５
図は３ビーム方式によつてトラツキングエラーを
検知される様子を示す説明図、第６図は半導体レ
ーザの放射特性を説明するための図、第７図はコ
リメートレンズにθ〃，θ⊥方向のレーザビーム
が入射される状態を説明するための図、第８図Ａ
，Ｂはそれぞれコリメートレンズを透過したレー
ザビームのθ〃方向とθ⊥方向の光量分布を示す
図、第９Ａ図、第９Ｂ図は対物レンズに入射され
るレーザビームの光量分布を示すものであり、第
９Ｂ図は対物レンズがα方向にシフトした状態を
示すものである。
１……半導体レーザ、２……回折格子、３……
無偏光ビームスプリツタ、４……コリメートレン
ズ、６……対物レンズ、７……平凹レンズ、８…
…ピンホトダイオード、１０……光学部材、１０
ａ……ビーム整形面、１０ｂ……反射面、１０ｃ
……透過面。
FIG. 1 is a component layout diagram of an optical pickup according to an embodiment of the present invention, FIG. 2 is an enlarged view of optical components according to the present invention, and FIG. 3 is an explanatory diagram of another embodiment of the present invention. Figure 4 is a parts layout diagram of a conventional thin optical pickup for portable or vehicle use.
The figure is an explanatory diagram showing how tracking errors are detected by the three-beam method, Figure 6 is a diagram to explain the radiation characteristics of a semiconductor laser, and Figure 7 is a diagram for explaining the radiation characteristics of a semiconductor laser. FIG. 8A is a diagram for explaining the state in which the laser beam is incident.
, B are diagrams showing the light quantity distribution in the θ〃 direction and θ⊥ direction, respectively, of the laser beam transmitted through the collimating lens, and Figures 9A and 9B are diagrams showing the light quantity distribution of the laser beam incident on the objective lens. , FIG. 9B shows a state in which the objective lens is shifted in the α direction. 1... Semiconductor laser, 2... Diffraction grating, 3...
Non-polarizing beam splitter, 4... Collimating lens, 6... Objective lens, 7... Plano-concave lens, 8...
... Pin photodiode, 10 ... Optical member, 10
a...beam shaping surface, 10b...reflection surface, 10c
...Transparent surface.
Claims (1)
れるレーザビームを光デイスクの記録面に集光さ
せる対物レンズと、前記レーザビームを反射させ
て対物レンズに導く光学部材と、光デイスクの記
録面から反射されたレーザビームを検知する受光
素子が備えられた光学式ピツクアツプの光学装置
において、前記光学部材には、レーザビームの入
射角あるいは出射角がθとなる位置に配置される
ビーム整形面と、このビーム整形面に対して垂直
に形成された反射面と、この反射面に入射するあ
るいはこの反射面に反射されるレーザビームが垂
直に入射されあるいは垂直に出射する透過面が形
成されており且つ、前記ビーム整形面のビーム整
形比をｍ、光学部材の屈折率をｎとしたときにｍ
＝ｎ＝ｔａｎθなる関係を満たしていることを特
徴とする光学式ピツクアツプの光学装置。 a semiconductor laser; an objective lens that focuses a laser beam emitted from the semiconductor laser onto a recording surface of an optical disk; an optical member that reflects the laser beam and guides it to the objective lens; In an optical pickup optical device equipped with a light receiving element for detecting a laser beam, the optical member includes a beam shaping surface disposed at a position where the incident angle or exit angle of the laser beam is θ, and the beam shaping surface. A reflecting surface formed perpendicular to the surface, and a transmitting surface from which a laser beam incident on or reflected by the reflecting surface is perpendicularly incident or emitted, and the beam is When the beam shaping ratio of the shaping surface is m and the refractive index of the optical member is n, then m
An optical pickup optical device characterized by satisfying the relationship: =n=tanθ.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6949989U JPH0310321U (en) | 1989-06-13 | 1989-06-13 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6949989U JPH0310321U (en) | 1989-06-13 | 1989-06-13 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0310321U true JPH0310321U (en) | 1991-01-31 |
Family
ID=31604855
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6949989U Pending JPH0310321U (en) | 1989-06-13 | 1989-06-13 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0310321U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003027709A (en) * | 2001-07-18 | 2003-01-29 | Nichiha Corp | Ceramic outer wall board and construction structure thereof |
-
1989
- 1989-06-13 JP JP6949989U patent/JPH0310321U/ja active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003027709A (en) * | 2001-07-18 | 2003-01-29 | Nichiha Corp | Ceramic outer wall board and construction structure thereof |
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