JPS6391818U - - Google Patents
Info
- Publication number
- JPS6391818U JPS6391818U JP18723986U JP18723986U JPS6391818U JP S6391818 U JPS6391818 U JP S6391818U JP 18723986 U JP18723986 U JP 18723986U JP 18723986 U JP18723986 U JP 18723986U JP S6391818 U JPS6391818 U JP S6391818U
- Authority
- JP
- Japan
- Prior art keywords
- reflected beam
- knife edge
- edge prism
- cylindrical part
- ridge line
- 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 claims description 5
- 230000035515 penetration Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 2
Landscapes
- Optical Recording Or Reproduction (AREA)
- Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
Description
第１図はこの考案に係るナイフエツジ用プリズ
ムの調整機構の一実施例を示す説明図、第２図は
第１図の矢印Ｐ方向からの矢視図、第３図は第１
図に示した保持体の斜視図、第４図〜第６図は従
来の光学系を示す説明図、第７図は第１図及び第
６図に示した光検出器の平面図、第８図は第６図
に示した保持板の斜視図である。
Ｄ…光デイスク、１０…光ピツクアツプ本体、
１２…支持穴、２０…光検出器、５０…対物レン
ズ、６０…ナイフエツジ用プリズム、８０…保持
体、８４…円柱部。
FIG. 1 is an explanatory diagram showing one embodiment of the knife edge prism adjustment mechanism according to this invention, FIG. 2 is a view taken from the direction of arrow P in FIG. 1, and FIG.
4 to 6 are explanatory diagrams showing conventional optical systems. FIG. 7 is a plan view of the photodetector shown in FIGS. 1 and 6. This figure is a perspective view of the holding plate shown in FIG. 6. D... Optical disk, 10... Optical pickup body,
DESCRIPTION OF SYMBOLS 12... Support hole, 20... Photodetector, 50... Objective lens, 60... Prism for knife edge, 80... Holder, 84... Cylindrical part.
Claims (1)
ビーム中のトラツク幅方向に相当する方向に延び
るナイフエツジ用プリズムの稜線を前記反射ビー
ムに侵入させてその略半分を遮ると共に、遮つた
反射ビームを前記稜線方向の中央で二分して前記
光検出器に結像させるナイフエツジ用プリズムの
調整機構であつて、 前記ナイフエツジ用プリズムを組付けた保持体
と該保持体を支持する光ピツクアツプ本体との何
れか一方に軸線が前記稜線と平行な円柱部を形成
し、他方に該円柱部が摺動自在に嵌合する支持穴
を設け、該支持穴に嵌合された前記保持体を前記
軸線回り方向へ回動させて前記ナイフエツジ用プ
リズムの前記反射ビームに対する侵入量を変化さ
せ、前記保持体を前記軸線方向へスライドさせて
前記ナイフエツジ用プリズムで二分された反射ビ
ームの光量を相対的に変化させる構成としたこと
を特徴とするナイフエツジ用プリズムの調整機構
。[Claims for Utility Model Registration] A ridge line of a knife edge prism extending in a direction corresponding to the track width direction in a reflected beam reflected by an optical disk and focused on a photodetector is inserted into the reflected beam to cover approximately half of the reflected beam. An adjustment mechanism for a knife edge prism that blocks the reflected beam and divides the blocked reflected beam into two at the center in the direction of the ridge line to form an image on the photodetector, the mechanism comprising: a holder on which the knife edge prism is assembled; and the holder. A cylindrical part whose axis is parallel to the ridge line is formed on one side of the optical pickup main body to be supported, a support hole is provided in the other side into which the cylindrical part is slidably fitted, and the cylindrical part is fitted into the support hole. The holding body is rotated in the direction around the axis to change the amount of penetration of the knife edge prism into the reflected beam, and the holding body is slid in the axial direction to rotate the reflected beam divided into two by the knife edge prism. A knife edge prism adjustment mechanism characterized by having a configuration that relatively changes the amount of light.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18723986U JPH0433541Y2 (en) | 1986-12-04 | 1986-12-04 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18723986U JPH0433541Y2 (en) | 1986-12-04 | 1986-12-04 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6391818U true JPS6391818U (en) | 1988-06-14 |
| JPH0433541Y2 JPH0433541Y2 (en) | 1992-08-11 |
Family
ID=31137537
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18723986U Expired JPH0433541Y2 (en) | 1986-12-04 | 1986-12-04 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0433541Y2 (en) |
-
1986
- 1986-12-04 JP JP18723986U patent/JPH0433541Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0433541Y2 (en) | 1992-08-11 |