JPS58118616A - Refraction type optical system for video projector - Google Patents
Refraction type optical system for video projectorInfo
- Publication number
- JPS58118616A JPS58118616A JP194782A JP194782A JPS58118616A JP S58118616 A JPS58118616 A JP S58118616A JP 194782 A JP194782 A JP 194782A JP 194782 A JP194782 A JP 194782A JP S58118616 A JPS58118616 A JP S58118616A
- Authority
- JP
- Japan
- Prior art keywords
- group
- optical system
- lens
- focal length
- screen side
- 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
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/16—Optical objectives specially designed for the purposes specified below for use in conjunction with image converters or intensifiers, or for use with projectors, e.g. objectives for projection TV
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B9/00—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
- G02B9/12—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having three components only
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
- Transforming Electric Information Into Light Information (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は投写管画像をスクリーンに投写するビデオプロ
ジェクタ−のための屈折型光学系に関するものであり、
少ないレンズ構成枚数によりF値が2より明るくかつ性
能の良好な屈折型光学系を提供することを目的とするも
のである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a refractive optical system for a video projector that projects a projection tube image onto a screen.
It is an object of the present invention to provide a refractive optical system that has a brighter F value than 2 and has good performance by using a small number of lenses.
本発明の構成は、第1図より明らかなように、スクリー
ン側より投写管側へ順に、スクリーン側Oて凸面を向け
た正屈折力の非球面プラスチック単レンズより成る第1
群(I)、両凸のXI遮蔽効果のあるガラス単レンズよ
り成る第2群(6)、及びスクリーン側に凹面を向けた
負屈折力の非球面プラスチック単レンズより成る第3群
(ID’に有するとともに、下記の条件を満足すること
を特徴とするF値が2より明るいビデオプロジェクタ−
用屈折型光学系である。As is clear from FIG. 1, the configuration of the present invention consists of a first aspherical plastic single lens with a positive refractive power and a convex surface facing toward the screen, in order from the screen side to the projection tube side.
group (I), a second group (6) consisting of a biconvex single glass lens with an XI shielding effect, and a third group (ID') consisting of an aspherical plastic single lens with negative refractive power with its concave surface facing the screen side. A video projector with an F value brighter than 2, characterized in that the video projector has the following characteristics and satisfies the following conditions:
It is a refractive optical system for
(1) N> 1.55
(2) 1.2f<f、<2.5f
但し、Nは前記第2群の屈折率、fは全系の焦点距離、
flは前記第1群の焦点距離である。(1) N> 1.55 (2) 1.2f<f, <2.5f However, N is the refractive index of the second group, f is the focal length of the entire system,
fl is the focal length of the first group.
また、本発明のより詳細な特徴は、上記条件(1)。Further, a more detailed feature of the present invention is the above condition (1).
(2)に加えさらに下記の条件を満足することである。In addition to (2), the following conditions must also be satisfied.
(3) 1.2<f、/f2<2.5イ11シ、f2
&′r前記第2群の焦点距離である。(3) 1.2<f, /f2<2.5i11shi, f2
&'r is the focal length of the second group.
なお、本発明の≠施にあたってはさらに、下記の条件を
満足することが望ましい。In carrying out the present invention, it is further desirable to satisfy the following conditions.
(4) 0.3f<D<0.5f
但し、Dは前記第2群と第3群との間の空気間隔である
。(4) 0.3f<D<0.5f where D is the air gap between the second group and the third group.
以下、本発明についてさらに詳しく説明する。The present invention will be explained in more detail below.
本発明では、第1群(Ilに非球面プラスチックレンズ
を用いることによって主に球面収差’kUじめとする諸
収差をバランスよく補正するとともに、第3群(III
)i/n非球面プラスチックレンズを用いることによっ
て主に塚面特性全良好にしている。また、第2群(9)
のガラスレンズは、投写管より発せられるX線を遮蔽す
る作用を兼ねており、これにより、第2群(IDから第
1群(I)までの間のノ・ウジングして丸・けるX線譚
蔽対策は不要となる0
次に本発明の条件について説明する0条件(1)は第2
群のガラスレンズの屈折率を規定するもので、この条件
を満足しないと、X線遮蔽効果のあるガラス材料を得る
ことが困難となるとともに、第2群に所定の屈折力を与
えるための屈折面曲率がきつくなり、球面のガラスレン
ズでは、球面収差をにじめとする諸収差全バランスよく
÷11正するのが困難となる。In the present invention, by using an aspherical plastic lens in the first group (Il), various aberrations mainly including spherical aberration 'kU' can be corrected in a well-balanced manner, and the third group (III
) By using an i/n aspherical plastic lens, the mound surface characteristics are mainly improved. Also, the second group (9)
The glass lens also has the function of shielding the X-rays emitted from the projection tube. There is no need to take countermeasures against false accusations.Next, the conditions of the present invention will be explained.Condition (1) is the second condition.
This specifies the refractive index of the glass lens of the group. If this condition is not satisfied, it will be difficult to obtain a glass material that has an X-ray shielding effect, and the refractive index to give the second group a predetermined refractive power. With a spherical glass lens, the surface curvature becomes steeper, making it difficult to properly balance spherical aberration and other aberrations by ÷11.
条件(2)は第1群への屈折力の配分を規定し、条件(
3)は、正の屈折力を担う第1群と第2群との間の相対
的な屈折力配分を規定するものである。すなわち、第1
群に比較的大きな正の屈折力を与え、レンズ系中の正の
屈折力を第1群と第2群とで適度に分担することによっ
て、軸上及び軸外の収差補正のバランスをとるとともに
、レンズ全長を短くし、全系をコンパクトに構成するの
が、条件(2)(より詳細には条件(2)と条件(3)
との組み合わせ)に表わされる本発明の特徴である。条
件(2)又は(3)の下限を外れるときには、第1群の
パワーが強くなり過ぎることによって高次の球面収差の
発生と像面湾曲の負偏移をきたす〇一方条件(2)又は
(3)の上限を外れると像面湾曲が補正過剰となり、壕
だ軸外のサジタルフレアーが発生する。いずれの場合も
軸上及び軸外での収差の均衡がとれず明るく高性能なレ
ンズ系としての構成が困難となる。Condition (2) defines the distribution of refractive power to the first group, and condition (
3) defines the relative distribution of refractive power between the first group and the second group, which bear positive refractive power. That is, the first
By giving a relatively large positive refractive power to the group and appropriately sharing the positive refractive power in the lens system between the first and second groups, it is possible to balance the correction of axial and off-axis aberrations. Condition (2) (more specifically, conditions (2) and (3)) shortens the total length of the lens and makes the entire system compact.
This is a feature of the present invention represented by the combination of When the lower limit of condition (2) or (3) is exceeded, the power of the first group becomes too strong, resulting in generation of high-order spherical aberration and negative shift of the curvature of field. On the other hand, condition (2) or If the upper limit of (3) is exceeded, the curvature of field will be overcorrected and off-axis sagittal flare will occur. In either case, the on-axis and off-axis aberrations cannot be balanced, making it difficult to construct a bright and high-performance lens system.
条件(4)は第2群と第3群の空気間隔を与えるもので
第1群と第2群のパワー配分において最適となる範囲を
決めるべきものである。条件(4)の下限を外れると像
面湾曲が負偏移するとともに非点隔差が拡大される。一
方条件(4)の上限を外れるとサジタルのフレアーが補
正不足になるとともに第3群と投写管との距離が極端に
近づくため実用上不都合である。Condition (4) gives the air spacing between the second and third groups, and should determine the optimum range for power distribution between the first and second groups. When the lower limit of condition (4) is exceeded, the curvature of field shifts negatively and the astigmatism difference increases. On the other hand, if the upper limit of condition (4) is exceeded, sagittal flare will be insufficiently corrected and the distance between the third group and the projection tube will become extremely close, which is inconvenient in practice.
次に本発明の実施例を示す。以下の古1述においてrl
、 rl ・はレンズ各面の曲率半u、dtt dz+
・・・はレンズ面間の肉厚または空気間隔、n工、n2
.・・・は各レンズのd線(波長587.6ruηの光
)に対する屈折率、シ1.シ2.・・・ばd線に対する
アツベ数である(すべてスクリーン側から投写管側への
Iia ) 。Next, examples of the present invention will be shown. In the following old 1st statement rl
, rl ・is the curvature half u of each surface of the lens, dtt dz+
... is the wall thickness or air gap between lens surfaces, n engineering, n2
.. ... is the refractive index of each lens for the d-line (light with a wavelength of 587.6ruη), and C2. ... is the Abbe number for the d-line (all Iia from the screen side to the projection tube side).
また、非球面形状を有する面(※印で表示)については
、その面の頂点から光軸上に投写管方向を正とするY軸
をとり、同頂点にY軸と垂直なY軸をとるとき非球面形
状を次の式にて表わす。For surfaces with an aspherical shape (indicated by *), the Y-axis with the projection tube direction as positive is taken from the apex of the surface on the optical axis, and the Y-axis perpendicular to the Y-axis is taken at the same apex. The aspherical shape is expressed by the following equation.
なおこの式HC、Y 2の項を含んだ表現であるためこ
の式で表わされる非球面の近・軸曲率は、co+2C1
どなっている。(但しC8” 1 /r : rは球面
としての曲率半柱)
〔実〃也例〕
f = 100. β=−0,122,F値1.o5
第1面(rl) 第5面(r5)c、
o、 26208 X 10”−2−0,11508X
10−”
C2−0゜22078 X 10”” −0,3
8763X 10″″゛C,o、11738 X 10
−’ 0.93770ヶ1o−。Note that this expression includes the terms HC and Y2, so the near-axial curvature of the aspheric surface expressed by this expression is co+2C1
There's a lot of yelling. (However, C8" 1 /r: r is a half cylinder of curvature as a spherical surface) [Real example] f = 100. β = -0,122, F value 1.o5
1st side (rl) 5th side (r5) c,
o, 26208 X 10"-2-0, 11508X
10-” C2-0゜22078 X 10”” -0,3
8763X 10''''゛C, o, 11738 X 10
-' 0.93770 pieces 1o-.
C4−0,70595X□。−”。C4-0, 70595X□. −”.
−0,11151X 10”−” C5−0,52317X 10 0、45873 X 10″″” ca o、 57586 X 10−”。-0,11151X 10"-" C5-0, 52317X 10 0,45873×10″″ ca o, 57586 X 10-”.
0、78070 X 10−”。0, 78070 X 10-”.
C,−0,60807ア1o月
−0,82634X 10″″′”
CB−1+、 98529う1o−280、7630’
9 X 10”−”
上記実施例のレンズ構成図を第1図に示す。′21図よ
り明らかなように、本実施例では第1肝はスクリーン側
]に凸の平凸非球面プラスチック単レンズ(I)より成
り、前記第2群はX掴遮蔽効果を有する両凸の球面ガラ
ス単レンズ(用より成るとともに、前記83群はスクリ
ーン側に凹[II]を向けた平凹非球面プラスチック単
レンズ(ト)より成る。なお、■)に、第3群OIDか
ら7.7隔てで配される厚さ8.5(n = 1.53
6. νd=50.7)の投写管フェースプレートであ
り、その図面右側面が螢光面となっている。上記実施例
1の収差図を第2図(て示す。C, -0,60807A1o-0,82634X 10''''' CB-1+, 98529U1o-280,7630'
9.times.10"-" A lens configuration diagram of the above embodiment is shown in FIG. As is clear from FIG. The 83rd group consists of a plano-concave aspherical plastic single lens (G) with the concave [II] facing the screen side.The third group OID to 7. Thickness 8.5 (n = 1.53
6. νd=50.7), and its right side in the drawing is a fluorescent surface. The aberration diagram of Example 1 is shown in FIG.
以上から明らかなように、本発明は少ないレンズ構成枚
数でF値が明るく、かつ収差図に示すよ、うに性能の良
好な屈折型光学系をビデオプロジェクタ−のために提供
するものである。ζらに、本発明の屈折型光学系は、第
2群にガラスレンズを用いているので、温度変化による
11点移動−1が、駆1群から視3#1でをすべてプラ
スチックとした場合の半分側1でなるという効果もある
。As is clear from the above, the present invention provides a refractive optical system for a video projector that has a small number of lenses, has a bright F value, and has good performance as shown in the aberration diagram. ζ et al., since the refractive optical system of the present invention uses a glass lens in the second group, the 11-point shift due to temperature change -1 is the same as when all from the drive 1 group to the optical 3 #1 are made of plastic. There is also the effect that half of the number is 1.
第1図は本発明の実施例11のレンズ構成図、第21〆
1は上記実施例1の収差図である。
■・第1# II・・・第2群 ■・・・第3群
出願人 ミノルタカメラ株式会社
第1図
第2図FIG. 1 is a lens configuration diagram of Example 11 of the present invention, and FIG. 21 is an aberration diagram of Example 1. ■・No. 1 # II...Group 2 ■...Group 3 Applicant Minolta Camera Co., Ltd. Figure 1 Figure 2
Claims (1)
に凸面を向けた正屈折力の非球面プラスチック単レンズ
より成る第1群、両凸のX線遮蔽効果のあるガラス単レ
ンズより成る第2群、及びスクリーン側に凹面を向けた
負屈折力の非球面プラスチック単レンズより成る第3群
を有するとともシこ、下記の条件を満足すること全特徴
とするF値が2より明るいビデオプロジェクタ−用屈折
型光N>1.55 1.2f<fl<2.5f 但し、 Nは前記第2群の屈折率、fは全系の焦点
距離、 flは前記第1群の焦点距離。 2、さらに、下記の条件全満足することを特徴とする特
許請求の範囲第1項記載の屈折型光学系:1.2 で
f、/f、<2.5 但し、f2は前記第2群の焦点距離。 3、 さらに、下記の条件を満足することヲ丑徴とする
特許請求の範囲第1項又は′第2項記載の屈折型光学系
: 0.3f<D<0.5f 但し、Dは前記第2群と第3群との間の空気間隔。 4、前記第1群及び第3群の投写管側の面が平面である
こと全特徴とする特許請求の範囲第1項乃至第3項のい
ずれかに記載の屈折型光学系。[Scope of Claims] 1. A first group consisting of an aspherical plastic single lens with positive refractive power with a convex surface facing the screen in order from the screen side to the projection tube side, and a biconvex glass unit with an X-ray shielding effect. The second group consists of a lens, and the third group consists of a single aspherical plastic lens with a negative refractive power with its concave surface facing the screen side. 2 Brighter refractive light for video projector N>1.55 1.2f<fl<2.5f However, N is the refractive index of the second group, f is the focal length of the entire system, and fl is the first group. focal length. 2. The refractive optical system according to claim 1, further satisfying all of the following conditions: 1.2 and f, /f<2.5, where f2 is the second group focal length. 3. The refractive optical system according to claim 1 or '2, which is further characterized by satisfying the following condition: 0.3f<D<0.5f, where D is Air spacing between the second and third groups. 4. A refractive optical system according to any one of claims 1 to 3, characterized in that surfaces of the first group and the third group on the projection tube side are flat.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP194782A JPS58118616A (en) | 1982-01-08 | 1982-01-08 | Refraction type optical system for video projector |
US06/347,032 US4577935A (en) | 1980-03-03 | 1982-02-08 | Video projector lens system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP194782A JPS58118616A (en) | 1982-01-08 | 1982-01-08 | Refraction type optical system for video projector |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS58118616A true JPS58118616A (en) | 1983-07-14 |
JPH0358087B2 JPH0358087B2 (en) | 1991-09-04 |
Family
ID=11515802
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP194782A Granted JPS58118616A (en) | 1980-03-03 | 1982-01-08 | Refraction type optical system for video projector |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS58118616A (en) |
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58125007A (en) * | 1982-01-20 | 1983-07-25 | Matsushita Electric Ind Co Ltd | Projection lens |
JPS58181009A (en) * | 1982-04-16 | 1983-10-22 | Matsushita Electric Ind Co Ltd | Projection lens |
JPS6067914A (en) * | 1983-09-22 | 1985-04-18 | Konishiroku Photo Ind Co Ltd | Projection lens for television projector |
JPS60177478U (en) * | 1984-05-07 | 1985-11-25 | 日本電気株式会社 | table tap |
US4564269A (en) * | 1983-08-29 | 1986-01-14 | Nippon Kogaku K.K. | Projection lens |
JPS61226720A (en) * | 1985-03-30 | 1986-10-08 | Matsushita Electric Ind Co Ltd | Projection lens |
US4682862A (en) * | 1986-01-17 | 1987-07-28 | U.S. Precision Lens Incorporated | Projection lens |
US4685774A (en) * | 1986-01-17 | 1987-08-11 | U.S. Precision Lens, Incorporated | Projection lens |
US4697892A (en) * | 1983-10-18 | 1987-10-06 | U.S. Precision Lens, Inc. | Projection lens |
US4755028A (en) * | 1986-10-14 | 1988-07-05 | U.S Precision Lens, Incorporated | Projection lens with an aspherical corrector lens element |
US4776681A (en) * | 1986-01-17 | 1988-10-11 | U.S. Precision Lens, Incorporated | Projection lens |
US4801196A (en) * | 1984-08-21 | 1989-01-31 | U.S. Precision Lens, Incorporated | Wide angle projection lens |
US4815831A (en) * | 1985-07-11 | 1989-03-28 | U.S. Precision Lens, Incorporated | Projection lens with color correction |
-
1982
- 1982-01-08 JP JP194782A patent/JPS58118616A/en active Granted
Cited By (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6218894B2 (en) * | 1982-01-20 | 1987-04-24 | Matsushita Electric Ind Co Ltd | |
JPS58125007A (en) * | 1982-01-20 | 1983-07-25 | Matsushita Electric Ind Co Ltd | Projection lens |
JPS58181009A (en) * | 1982-04-16 | 1983-10-22 | Matsushita Electric Ind Co Ltd | Projection lens |
JPH0411847B2 (en) * | 1982-04-16 | 1992-03-02 | Matsushita Electric Ind Co Ltd | |
US4564269A (en) * | 1983-08-29 | 1986-01-14 | Nippon Kogaku K.K. | Projection lens |
JPS6067914A (en) * | 1983-09-22 | 1985-04-18 | Konishiroku Photo Ind Co Ltd | Projection lens for television projector |
JPH0433005B2 (en) * | 1983-09-22 | 1992-06-01 | Konishiroku Photo Ind | |
US4697892A (en) * | 1983-10-18 | 1987-10-06 | U.S. Precision Lens, Inc. | Projection lens |
JPS60177478U (en) * | 1984-05-07 | 1985-11-25 | 日本電気株式会社 | table tap |
US4801196A (en) * | 1984-08-21 | 1989-01-31 | U.S. Precision Lens, Incorporated | Wide angle projection lens |
JPS61226720A (en) * | 1985-03-30 | 1986-10-08 | Matsushita Electric Ind Co Ltd | Projection lens |
US4815831A (en) * | 1985-07-11 | 1989-03-28 | U.S. Precision Lens, Incorporated | Projection lens with color correction |
US4776681A (en) * | 1986-01-17 | 1988-10-11 | U.S. Precision Lens, Incorporated | Projection lens |
US4685774A (en) * | 1986-01-17 | 1987-08-11 | U.S. Precision Lens, Incorporated | Projection lens |
US4682862A (en) * | 1986-01-17 | 1987-07-28 | U.S. Precision Lens Incorporated | Projection lens |
US4755028A (en) * | 1986-10-14 | 1988-07-05 | U.S Precision Lens, Incorporated | Projection lens with an aspherical corrector lens element |
Also Published As
Publication number | Publication date |
---|---|
JPH0358087B2 (en) | 1991-09-04 |
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