JPS63273807A - Aspherical single lens - Google Patents
Aspherical single lensInfo
- Publication number
- JPS63273807A JPS63273807A JP10936687A JP10936687A JPS63273807A JP S63273807 A JPS63273807 A JP S63273807A JP 10936687 A JP10936687 A JP 10936687A JP 10936687 A JP10936687 A JP 10936687A JP S63273807 A JPS63273807 A JP S63273807A
- Authority
- JP
- Japan
- Prior art keywords
- aspherical
- lens
- single lens
- refractive index
- thickness
- 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 abstract description 4
- 230000004075 alteration Effects 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 201000009310 astigmatism Diseases 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000004304 visual acuity Effects 0.000 description 1
Landscapes
- Lenses (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、ビデオディスク再生用対物レンズ等として
使用される大口径比非球面単レンズに関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a large aperture ratio aspheric single lens used as an objective lens for video disk reproduction.
この発明で目的とするビデオディスク再生用対物レンズ
は、高い解像力が要求され又収差も回折限界内に収まる
程度に補正されている必要がある。The objective lens for video disk reproduction, which is the object of the present invention, is required to have high resolving power, and aberrations must be corrected to the extent that they fall within the diffraction limit.
又ビデオディスクにおいてはトラッキングのために対物
レンズ自体を動かす方式がとられることがあり、対物レ
ンズは極めて小型軽量でなければならずレンズ枚数を少
なくする必要がある。Furthermore, in video discs, a method is sometimes used in which the objective lens itself is moved for tracking purposes, and the objective lens must be extremely small and lightweight, and the number of lenses must be reduced.
そのためにビデオディスク再生用対物レンズは、単レン
ズにし、しかも前に述べたレンズ性能を得るために球面
単レンズでは無理で、非球面単レンズにする必要がある
。しかも非球面単レンズは製作が容易でない。For this purpose, the objective lens for video disk reproduction must be a single lens, and in order to obtain the lens performance described above, it is impossible to use a spherical single lens; it is necessary to use an aspherical single lens. Moreover, aspherical single lenses are not easy to manufacture.
この発明は、前に述べたような要求を満足するビデオデ
ィスク再生用対物レンズ等に利用する非球面単レンズを
提供することを目的とするものである。An object of the present invention is to provide an aspherical single lens for use in an objective lens for video disc reproduction, etc., which satisfies the above-mentioned requirements.
このような問題を解決するためには、両面がいずれも非
球面であって、非球面のような特殊な形状であっても容
易に多量に生産が可能なようにプラスチックの非球面単
レンズにした。In order to solve this problem, we developed a plastic aspherical single lens that has both aspherical surfaces and can be easily produced in large quantities even with a special shape such as an aspherical surface. did.
即ちこの発明の単レンズは、第1図に示すような断面形
状の第1面および第2面がいずれも非球面であって、こ
れらの非球面はhを光軸からの高さ、Xを対応する非球
面頂点の接平面からの距離。That is, in the single lens of the present invention, the first and second surfaces of the cross-sectional shape shown in FIG. 1 are both aspherical surfaces, and these aspherical surfaces have h as the height from the optical axis and Distance from the tangent plane of the corresponding aspheric vertex.
Cを非球面頂点の曲率、kを円錐定数、A、B。C is the curvature of the aspherical apex, k is the conic constant, A, B.
C,Dを非球面係数とすると次の式で表わされる更にこ
の発明の単レンズは次の諸元を有している。When C and D are aspherical coefficients, the single lens of the present invention is expressed by the following equation.Furthermore, the single lens of the present invention has the following specifications.
f = 4.50 、N A = 0.45 、WD
= 1.937r 、 =−2−= 2.78432
3 、 k1= −1,12282■
A =3.3578?lX10 、 B1=5.5
93181X10C= −5,075802X 10
、D 1= 0r、、 =−E =−8,309
848、に2=−2,14983X 10A =O,
B1 =0.C1=0.D、=Od =3.3608
、d2=1.2 、 N1=1.48801N は
レンズエの780nmにおける屈折率、N2はディスク
2の780nmにおける屈折率。f = 4.50, NA = 0.45, WD
= 1.937r, =-2-= 2.78432
3, k1=-1,12282■A=3.3578? lX10, B1=5.5
93181X10C=-5,075802X 10
, D 1= 0r, , =-E =-8,309
848, 2=-2,14983X 10A=O,
B1=0. C1=0. D,=Od=3.3608
, d2=1.2, N1=1.48801N is the refractive index of Lensue at 780 nm, and N2 is the refractive index of disk 2 at 780 nm.
この発明の非球面単レンズは、NAが0.45で非常に
大きく、差動距離が1.937で比較的大であり、上記
のように両面非球面で屈折率が1.48801のプラス
チック材料(例えばアクリル樹脂)により射出成形等の
成形手段にて製造される。The aspherical single lens of this invention has a very large NA of 0.45, a relatively large differential distance of 1.937, and is made of plastic material with aspherical surfaces on both sides and a refractive index of 1.48801 as described above. (for example, acrylic resin) using a molding method such as injection molding.
この発明の非球面単レンズの収差は第2図〜第4図に示
した。波面収差(rms)は、像高が0テ0.0054
人、 0.07−11’0.0218λ、0.1テo、
0350入である。The aberrations of the aspherical single lens of this invention are shown in FIGS. 2 to 4. Wavefront aberration (rms) is 0.0054 when the image height is 0.
Person, 0.07-11'0.0218λ, 0.1 Teo,
It comes in 0350 pieces.
この発明の非球面単レンズは、収差曲線図や波面収差か
ら明らかなようにすぐれたレンズである〔発明の効果〕
この発明では、ビデオディスク用対物レンズ等で要求さ
れる要件である小型軽量で高い性能のレンズで、しかも
プラスチック製で製造が簡単で多量生産に適している。The aspheric single lens of the present invention is an excellent lens as is clear from the aberration curve diagram and wavefront aberration. [Effects of the Invention] The present invention has achieved a compact and lightweight lens, which is a requirement for objective lenses for video discs, etc. It is a high-performance lens, and since it is made of plastic, it is easy to manufacture and suitable for mass production.
第1図は本発明の構成図、第2図は本発明のレンズの球
面収差及び正弦条件違反量、第3図は非点収差、第4図
は横収差。FIG. 1 is a configuration diagram of the present invention, FIG. 2 is a spherical aberration and amount of violation of the sine condition of the lens of the present invention, FIG. 3 is astigmatism, and FIG. 4 is lateral aberration.
Claims (1)
の高さ、xを光軸からの高さhの非球面頂点の接平面か
らの距離、cを非球面頂点の曲率、kを円錐定数、A、
B、C、Dを非球面係数として、非球面が式 x=(ch^2/{1+√[1−(1+k)c^2h^
2]})+Ah^4+Bh^6+Ch^8+Dh^1^
0で表わされ、次の諸元を持つ非球面単レンズ。 r_1=1/c_1=2.764323、k_1=−1
.12282A_1=3.357871×10^−^3
、B_1=5.593161×10^−^5C_1=−
5.075802×10^−^6、D_1=0r_2=
1/c_2=−6.309848、k_2=−2.14
983×10A_2=0、B_2=0、C_2=0、D
_2=0d_1=3.3606、d_2=1.20、N
_1=1.48601N_2=1.55 (d_1はレンズの厚さ、d_2はディスクの厚さ、N
_1は780nmにおけるレンズの屈折率N_2は78
0nmにおけるディスクの屈折率)[Claims] Both the first surface and the second surface are aspheric surfaces, where h is the height from the optical axis, x is the distance from the tangential plane of the apex of the aspheric surface at the height h from the optical axis, and c is the curvature of the aspherical vertex, k is the conic constant, A,
Let B, C, and D be aspherical coefficients, and the aspherical surface is expressed by the formula x = (ch^2/{1+√[1-(1+k)c^2h^
2]})+Ah^4+Bh^6+Ch^8+Dh^1^
An aspheric single lens represented by 0 and having the following specifications. r_1=1/c_1=2.764323, k_1=-1
.. 12282A_1=3.357871×10^-^3
,B_1=5.593161×10^-^5C_1=-
5.075802×10^-^6, D_1=0r_2=
1/c_2=-6.309848, k_2=-2.14
983×10A_2=0, B_2=0, C_2=0, D
_2=0d_1=3.3606, d_2=1.20, N
_1=1.48601N_2=1.55 (d_1 is the thickness of the lens, d_2 is the thickness of the disk, N
_1 is the refractive index of the lens at 780 nm N_2 is 78
refractive index of the disk at 0 nm)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62109366A JP2556975B2 (en) | 1987-05-02 | 1987-05-02 | Aspheric single lens |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62109366A JP2556975B2 (en) | 1987-05-02 | 1987-05-02 | Aspheric single lens |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS63273807A true JPS63273807A (en) | 1988-11-10 |
JP2556975B2 JP2556975B2 (en) | 1996-11-27 |
Family
ID=14508413
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62109366A Expired - Lifetime JP2556975B2 (en) | 1987-05-02 | 1987-05-02 | Aspheric single lens |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2556975B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH08271703A (en) * | 1995-03-29 | 1996-10-18 | Konica Corp | Resin lens |
-
1987
- 1987-05-02 JP JP62109366A patent/JP2556975B2/en not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH08271703A (en) * | 1995-03-29 | 1996-10-18 | Konica Corp | Resin lens |
Also Published As
Publication number | Publication date |
---|---|
JP2556975B2 (en) | 1996-11-27 |
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Legal Events
Date | Code | Title | Description |
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R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
EXPY | Cancellation because of completion of term | ||
FPAY | Renewal fee payment (event date is renewal date of database) |
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