JPS58198017A - Projection lens - Google Patents
Projection lensInfo
- Publication number
- JPS58198017A JPS58198017A JP8227882A JP8227882A JPS58198017A JP S58198017 A JPS58198017 A JP S58198017A JP 8227882 A JP8227882 A JP 8227882A JP 8227882 A JP8227882 A JP 8227882A JP S58198017 A JPS58198017 A JP S58198017A
- Authority
- JP
- Japan
- Prior art keywords
- lens
- convex
- lenses
- projection
- mirror
- 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
- G02B13/18—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
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/74—Projection arrangements for image reproduction, e.g. using eidophor
- H04N5/7408—Direct viewing projectors, e.g. an image displayed on a video CRT or LCD display being projected on a screen
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Lenses (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は、投写形テレビジョン装置に適した投影レンズ
に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a projection lens suitable for a projection television apparatus.
テレビジョン受像機の画像再生面を大形化して小形の画
面では得られない迫力に富んだ画像を得たいという要求
が強まるにつれ、陰極線管の螢光面に再生された画像を
レンズ、反射鏡などの投写光学系によりスクリーン上に
投写して大形のテレビジョン画像を得るようにした、い
わゆる投写形テレビジョン装置が広く用いられるように
なってきた。As the demand for increasing the size of the image reproduction surface of television receivers to obtain more powerful images that cannot be obtained with smaller screens has increased, the image reproduced on the fluorescent surface of the cathode ray tube is transmitted through lenses and reflectors. So-called projection television apparatuses, which obtain large-sized television images by projecting them onto a screen using a projection optical system such as the BACKGROUND ART, have become widely used.
かかる投写形テレビジョン装置において、これまで種々
の改良が加えられた結果、画質が著しく向上したが、明
るさや解像度の点でまだ充分とはいえない。そこで、投
影レンズを構成するレンズをプラスチックで形成し、該
レンズの枚数を低減するとともに面形状を非球面化し、
明るさと解像度とを向上させる試みがなされている。特
開昭５５−１２４１１４ 号公報に記載された従来技術
によると、投影レンズを３枚のレンズにより構成し、Ｆ
ナンバが１０近くのものが達成されており、従来に比べ
るど非常に明るくなっている。As a result of various improvements made to such projection television apparatuses, the image quality has significantly improved, but the brightness and resolution are still not sufficient. Therefore, the lenses constituting the projection lens are made of plastic, the number of lenses is reduced, and the surface shape is made aspherical.
Attempts have been made to improve brightness and resolution. According to the prior art described in Japanese Patent Application Laid-Open No. 55-124114, the projection lens is composed of three lenses, and the F
A number close to 10 has been achieved, which is much brighter than before.
一方、投写形テレビジョン装置においては、ミラーを内
蔵することにより非常に小型にｔ＄４成することができ
る。On the other hand, a projection television apparatus can be made extremely compact by incorporating a mirror.
第１図は３枚のレンズからなる投影レンズを備えたかか
る従来の投写形テレビジョン装置の一例を示す構成図で
あって、１は筐体、２は陰極線管、３はスクリーン、４
．５．６はミラー、７は凹レンズ、８．９は凸レンズで
ある。FIG. 1 is a configuration diagram showing an example of such a conventional projection television apparatus equipped with a projection lens consisting of three lenses, in which 1 is a housing, 2 is a cathode ray tube, 3 is a screen, and 4
．． 5.6 is a mirror, 7 is a concave lens, and 8.9 is a convex lens.
同図において、筺体１内の陰極線管２に映出された画像
は、凹レンズ７、凸レンズ８．９からなる投影レンズに
より拡大され、ミラー５．６で反射されて筐体１に設け
たスクリーン３上に投写され、拡大された画像が表示さ
れる。In the figure, an image projected on a cathode ray tube 2 inside a housing 1 is magnified by a projection lens consisting of a concave lens 7 and a convex lens 8.9, reflected by a mirror 5.6, and reflected on a screen 3 provided in the housing 1. The enlarged image will be displayed.
投影レンズは凹レンズ７、凸レンズ８，９の３枚のレン
ズで構成されるから、非常に明るい拡大画像がスクリー
ン３上に得られＵまた、陰極線管２からスクリーン３ま
での光路は、ミラー５．６により折り曲げられ、さらに
、投影レンズの凸レンズ８．９間にもミラー４が設けら
れて折り曲げられていることから、投写形テレビジョン
装置としては、非常に小形に構成することができる。Since the projection lens is composed of three lenses: a concave lens 7 and convex lenses 8 and 9, a very bright enlarged image can be obtained on the screen 3.The optical path from the cathode ray tube 2 to the screen 3 is formed by a mirror 5. Since the mirror 4 is also provided between the convex lenses 8 and 9 of the projection lens and is bent, the projection television apparatus can be configured very compactly.
しかしながら、かかる投影レンズは、レンズ７゜８．９
の面を所定の球面、非球面に形成して収差をなくシ、解
像度の向上をはかつているが、それでも解像度は充分と
はいえない。これは、画面の周辺の収差が比較的大きい
ことによるものである。However, such a projection lens has a lens 7°8.9
Although attempts have been made to improve resolution by forming the surface into a predetermined spherical or aspherical surface to eliminate aberrations and improve resolution, the resolution is still not sufficient. This is because aberrations around the screen are relatively large.
本発明の目的は、上記従来技術の欠点を除き、画面の周
辺の収差を除いて解像度を向上せしめ、非常に明るくて
高解像度の拡大画像を得ることができるようにするとと
もに、投写テレビジョン装置を小型に構成することがで
きるようにした投影レンズを提供するにある。An object of the present invention is to eliminate the drawbacks of the above-mentioned prior art, improve the resolution by eliminating aberrations around the screen, and to provide a projection television apparatus that can obtain an extremely bright and high-resolution enlarged image. The object of the present invention is to provide a projection lens that can be constructed in a compact size.
この目的を達成するために、本発明は、凹レンズと、該
凹レンズ側に凹面を有する凸メニスカスレンズと、両面
が凸面の第１の凸レンズと、比較的弱いパワーの第２の
凸レンズとを順次配列し、 ′該第１および第２
の凸レンズ間に光路を折り曲げるためのミラーを設ける
ことができる間隔を設けた点を特徴とする。In order to achieve this object, the present invention sequentially arranges a concave lens, a convex meniscus lens having a concave surface on the concave lens side, a first convex lens having convex surfaces on both sides, and a second convex lens having a relatively weak power. and 'the first and second
It is characterized by providing an interval between the convex lenses so that a mirror for bending the optical path can be provided.
以下、本発明の実施例を図面について説明する。Embodiments of the present invention will be described below with reference to the drawings.
第２図は本発明による投影レンズの一実施例を示す構成
図であって、１ｏは凸メニスカスレンズであり、第１図
に対応する部分には同一符号をつけている。FIG. 2 is a block diagram showing an embodiment of the projection lens according to the present invention, in which 1o is a convex meniscus lens, and parts corresponding to those in FIG. 1 are given the same reference numerals.
第２図において、陰極線管２側がら順に陰極線管２側の
面が平面で他方の面が凹面の凹レンズ７゜凹レンズ７側
が凹状となる凸メニスカスレンズ１゜、両面が凸面の凸
レンズ８．比較的弱いパワーの凸レンズ８側の面が平面
で他方の面が凸面の凸レンズ９が配列されて投影レンズ
が構成されており、夫々のレンズはアクリル材からなる
とともに、面形状を球面か非球面とする。In FIG. 2, in order from the cathode ray tube 2 side, a concave lens 7° whose surface on the cathode ray tube 2 side is flat and the other surface is concave, a convex meniscus lens 1° whose surface on the concave lens 7 side is concave, and a convex lens 8 whose both surfaces are convex. A projection lens is constructed by arranging convex lenses 9, each of which has a flat surface on one side and a convex surface on the other side.Each lens is made of acrylic material and has a surface shape of either spherical or aspherical. shall be.
凹レンズ７は像面彎曲を補正して平面化する作用を有す
るものであって、陰極線管２側の面（以下、面Ｓ１とい
う）は平面で他方の面（以下、面Ｓｔという）は凹状の
非球面をなしている。The concave lens 7 has the function of correcting field curvature and flattening it, and the surface on the cathode ray tube 2 side (hereinafter referred to as surface S1) is flat and the other surface (hereinafter referred to as surface St) is concave. It has an aspherical surface.
凸メニスカスレンズ１０と凸レンズ８とは画面周辺の収
差を補正し、解像度を向上させる作用を有するものであ
って、凸メニスカスレンズ１ｏの凹レンズ７側の面（以
下、面Ｓ８という）と凸レンズ８の凸レンズ７側の面（
以下、面Ｓ６という）とは非球面を、また、凸メニスカ
スレンズ１ｏの他方の面（以下、面Ｓ４という）と凸レ
ンズ８の他方の面（以下、面８．という）とは球面をな
している。The convex meniscus lens 10 and the convex lens 8 have the function of correcting aberrations around the screen and improving resolution, and the surface of the convex meniscus lens 1o on the concave lens 7 side (hereinafter referred to as surface S8) Convex lens 7 side surface (
The other surface of the convex meniscus lens 1o (hereinafter referred to as surface S4) and the other surface of the convex lens 8 (hereinafter referred to as surface 8) are spherical surfaces. There is.
凸レンズ９は球面収差を補正する作用を有するものであ
って、凸レンズ８側の面（以下、面ｓ−ｔという）は平
面で他方の而（以下、面Ｓａという）は非球面をなして
いる。The convex lens 9 has the function of correcting spherical aberration, and the surface on the side of the convex lens 8 (hereinafter referred to as surface s-t) is a flat surface, and the other surface (hereinafter referred to as surface Sa) is an aspherical surface. .
次に１かかる投影レンズの各構成レンズの表面曲率半径
、全開口数１面間隔、屈折率の一具体例を表１に、また
、面Ｓ重量 Ｓｌ ＊ Ｓａ ＃ Ｓｌの非球面係数を
表２に示す。なお、この投影レンズのＦナンバは０．９
５ 、焦点距離は１１７．４ｍ＋である。Next, Table 1 shows a specific example of the surface curvature radius, total numerical aperture, and refractive index of each constituent lens of the projection lens, and Table 2 shows the aspheric coefficient of the surface S weight Sl * Sa # Sl. show. The F number of this projection lens is 0.9.
5, the focal length is 117.4m+.
表 １
第３図（Ａ）ないしくト）および第４図（Ａ）ないしく
ハ）はかかる投影レンズを倍率８．７倍で使用したとき
の収差を示す特性図であって、第３図（Ａ）ないしくト
））は物高が夫々６３．５ ｍ 、 ５０．４期、 ３
＆ １ ｍ 、 ２５．４ｍ ｅ １２．７ ｍ 、
０．０閣におけるサジタル方向の横収差を示し、また
、第４図（Ａ）ないしくニ）は物高が夫々６３．５ Ｉ
ＩＩ ５０．４ ＩＩＩ ｍ ３８．１１１Ｅ１１ ａ
２ ’ ４１２１ ｍ１２７簡におけるメリデイオナ
ル方向の横収差を示す。Table 1 Figures 3(A) to 4) and 4(A) to 4) are characteristic diagrams showing aberrations when such a projection lens is used at a magnification of 8.7 times. The height of (A) or Iku)) is 63.5 m, 50.4 m, and 3, respectively.
& 1 m, 25.4 m e 12.7 m,
The transverse aberration in the sagittal direction at 0.0 mm is shown, and Fig. 4 (A) or D) shows the lateral aberration when the object height is 63.5 I, respectively.
II 50.4 III m 38.111E11 a
2' 4121 This shows the lateral aberration in the meridional direction in the 127-meter lens.
第３図、第４図から明らかなように、横収差は３閣以内
におさえることができ、Ｐナンバ０．９５まで中心軸上
、周辺まで充分に収差が梅正されている。従って、スク
リーン３（第２図）上には明るくて高解像度の拡大画像
が得られる。As is clear from FIGS. 3 and 4, lateral aberrations can be suppressed to within three degrees, and aberrations are sufficiently corrected on the central axis and to the periphery up to a P number of 0.95. Therefore, a bright, high-resolution enlarged image is obtained on the screen 3 (FIG. 2).
表１から明らかなように、凸レンズ８の面８６と凸Ｌ＜
ンズ９の面８．との間隔は１１！ｓｗであって充分に広
く、凸レンズ８．９間にミラーを内在させることができ
る。このために、光路を折り曲げることができ、投写形
テレビジョン装置の構成を小形化することができる。一
般に、２つのレンズ間４
にミラーを内在させることができるためのレンズ間の間
隔ＴＨは、これらレンズの互いに向き合う夫々の面の全
開口径をＤＩ、Ｄ！とすると、であるが、光量を少し犠
牲にしてもよいときには、Ｄ、 十り。As is clear from Table 1, the surface 86 of the convex lens 8 and the convex L<
side 8 of lens 9. The distance between them is 11! sw and is sufficiently wide so that a mirror can be included between the convex lenses 8 and 9. Therefore, the optical path can be bent, and the configuration of the projection television apparatus can be made smaller. In general, the distance TH between the two lenses, which allows a mirror to be placed between them, is the total aperture diameter of the mutually facing surfaces of these lenses, DI, D! Then, when it is acceptable to sacrifice a little amount of light, D is sufficient.
ＴＨ）０．９Ｘ□・・・・・・（２） であればよい。TH)0.9X□・・・・・・(2) That's fine.
第５図はかかる投影レンズを投写形テレビジョン装置に
設けた一興体例を示す構成図であって、第１図および第
２図に対応する部分には同一符号をつけている。FIG. 5 is a block diagram showing an example of a single entertainment system in which such a projection lens is provided in a projection television apparatus, and parts corresponding to those in FIGS. 1 and 2 are given the same reference numerals.
第５図において、凸レンズ８．９間にはミラー４を内在
させることができ、ミラー５．６とともに光路はシラー
４でも折り曲げられるから投写形テレビジョン装置とし
ては小形に構成することかでき、また、凸メニスカスレ
ンズ１０と凸レンズ８との作用により、周辺の収差が低
減され、Ｆナンバ０．９５まで収差が補正されて、スク
リーン３上に明るくて高解像度の拡大画像が得られる。In FIG. 5, a mirror 4 can be placed between the convex lenses 8 and 9, and the optical path can be bent by the mirror 4 together with the mirrors 5 and 6, so that the projection television apparatus can be constructed compactly. By the action of the convex meniscus lens 10 and the convex lens 8, peripheral aberrations are reduced and the aberrations are corrected to an F number of 0.95, so that a bright, high-resolution enlarged image can be obtained on the screen 3.
次に、第２図に示した投影レンズの各構成レンズの表面
曲率半径、面間隔および屈折率の他の具体例を、陰極線
管２の螢光面、フェースプレートの曲率半径、面間隔、
屈折率と合わせて表３に示し、また、面” ’ Ｓｍ
＋ ８ｍ 、 Ｓｇの非球面係数を表４に示す。なお、
この投影レンズのＦナンバはＣ９５゜焦点距１１ｉは１
１７４目である。Next, other specific examples of the surface curvature radius, surface spacing, and refractive index of each constituent lens of the projection lens shown in FIG.
It is shown in Table 3 together with the refractive index, and the surface "' Sm
Table 4 shows the aspherical coefficients of +8m and Sg. In addition,
The F number of this projection lens is C95°, and the focal length 11i is 1
It is the 174th.
なお、表３において、面Ｓ６は開口絞りについての値で
ある。また、Ｃ１はフェースブレートノ螢光面側の面、
Ｃ１はその反対側の面である。Note that in Table 3, the surface S6 is a value for the aperture stop. In addition, C1 is the surface of the face plate on the fluorescent surface side,
C1 is the opposite surface.
なお、表４の各非球面係数は、前記衣２で説明した偏位
２を表わす式の係数である。It should be noted that each aspherical coefficient in Table 4 is a coefficient of the equation representing the deviation 2 explained in the above-mentioned section 2.
第６図（Ａ）ないしくＣ）および第７図（Ａ）ないしく
Ｃ）はかかる投影レンズを倍率９３７倍で使用したとき
の各相対物高に対する収差を示す特性図であって、第６
図（Ａ）ないしくＣ）はメリディオナル方向の横収差を
示し、また、第７図（Ａ）ないしくＣ）はサジタル方向
の横収差を示す。6(A) to C) and FIG. 7(A) to C) are characteristic diagrams showing aberrations for each relative object height when such a projection lens is used at a magnification of 937 times.
Figures (A) to (C) show transverse aberrations in the meridional direction, and Figures (A) to (C) show transverse aberrations in the sagittal direction.
これら特性図から明らかなように、横収差を２間以内に
おさえることができ、Ｆナンバ０９５まで中心軸上、周
辺まで充分に収差が補正されている。また、表３から明
らかなように、凸レンズ８．９間の間隔は１１５ｍと充
分大きく、上記（１）式、（２）式からミラーを設けて
光路を折り曲げることができるから、鉛５図に示すよう
に投写形テレビジョン装置を小形に構成することができ
る。As is clear from these characteristic diagrams, lateral aberrations can be suppressed to within 2 degrees, and aberrations are sufficiently corrected up to F number 095 on the central axis and to the periphery. Furthermore, as is clear from Table 3, the distance between the convex lenses 8 and 9 is sufficiently large at 115 m, and from equations (1) and (2) above, it is possible to bend the optical path by providing a mirror. As shown, the projection television apparatus can be configured to be compact.
以上説明したように、本発明によれば、Ｆナンバを０．
９５と非常に明るくして画面の周辺までも収差を充分に
低減することができるとともに、所定の構成レンズ間に
ミラーを設けることができるように各構成レンズを配列
するもの゛であるから、明るさ、解像度が充分に向上し
た投写形テレビジョン装置を実現することができ、また
、かかる投写形テレビジョン装置の小形化をはかること
ができて、前記従来技術にない優れた機能の投影レンズ
を提供することができる。As explained above, according to the present invention, the F number is set to 0.
95, which makes it possible to sufficiently reduce aberrations even to the periphery of the screen, and the constituent lenses are arranged so that mirrors can be installed between predetermined constituent lenses. This makes it possible to realize a projection television device with sufficiently improved resolution, to make such a projection television device compact, and to provide a projection lens with excellent functions not found in the prior art. can be provided.
第１図は従来の投写形テレビジョン装置の一例を示す構
成図、第２図は本発明による投影レンズの一実施例を示
す構成図、第３図（Ａ）ないしくト）および第４図（Ａ
） ７２いしくト））は第２図の投影レンズの一員体例
におけるサジタル方向、メリデイオナル方向の横収差を
示す特性図、第５図は第２図の投影レンズを投写形テレ
ビジョン装置に設けた一具体例を示す構成図、第６図（
Ａ）ないし０およびＭ７図（Ａ）ないしくＣ）は第２図
の投影レンズの他の具体例におけるメリディオナル方向
、サジタル方向の横収差を示す特性図である。
２・・・・・・陰極線管、３・・・・・・スクリーン、
４・・・・・・ミラー、７・・・・・・凹レンズ、８・
・・・・・凸レンズ、９・・・・・・凸レンズ、１０・
・・・・・凸メニスカスレンズ。
代 理 人 弁理士 武 顕次部（はか１名）纂６図FIG. 1 is a block diagram showing an example of a conventional projection television apparatus, FIG. 2 is a block diagram showing an embodiment of a projection lens according to the present invention, FIGS. (A
) 72 Ishikto)) is a characteristic diagram showing the lateral aberration in the sagittal direction and the meridional direction in an example of the projection lens shown in FIG. 2 as a single unit, and FIG. A configuration diagram showing a specific example, Fig. 6 (
Figures A) to M7 and (A) to C) are characteristic diagrams showing transverse aberrations in the meridional direction and the sagittal direction in other specific examples of the projection lens shown in FIG. 2. 2...Cathode ray tube, 3...Screen,
4...Mirror, 7...Concave lens, 8.
...Convex lens, 9...Convex lens, 10.
...Convex meniscus lens. Agent: Patent Attorney Takeshi Kenjibu (1 person) Compilation 6
Claims (1)
拡大投影するための投影レンズにおいて、凹レンズと、
該凹レンズ側に凹面を有する凸メニスカレンズと、両面
が凸面の第１の凸レンズと、第２の凸レンズとが順次配
列されてなり、該第１の凸レンズと該第２の凸レンズと
の間を所定の間隔とし、該第１．第２の凸レンズ間にミ
ラーを設けることができるように構成したことを特徴と
する投影レンズ。 （２） 特許請求の範囲第（１）項において、前記所
定の間隔ＴＨは、 凸レンズ側の面の全開口径 り、−前記第２の凸レンズの前記第１の凸レンズ側の面
の全開０径 であることを特徴とする投影レンズ。 （８） 特許請求の範囲第（１）項または胎（２）項
において、表面曲率半径、全開口径、面間隔、屈折率お
よび非球面係数が夫々下記の表で示す値を有し、Ｆナン
バが０．９５であることを特徴とする投影レンズ。 但し、８１ ａ Ｓｊ ａ Ｓｌ ａ ８？は前記夫々
のレンズの前記陰極線管側一方の面を表わし、ｓ、 Ｉ
ｓ、 ＩＳ、 、 Ｓ、は前記夫々のレンズの他方の
面を表わす０ （４） 特許請求の範囲第（１）項または第（２）項
において、表面曲率半径、面間隔、屈折率および非球面
係数カ夫々下記の表で示す値を有し、Ｆナンバが０．９
５であることを特徴とする投影レンズ。 但し、８１ ＊ ８＠ ＊ ”ｌ ＊ ”Ｙは前記夫々
のレンズの前記陰極線管側一方の面を表わし、ｓ宜ｅｓ
４ ＊Ｓ、、Ｓ、は前記夫々のレンズの他方の面を表わ
す。また、上記表において、面Ｓ、は開口絞りについて
の値である。 、 妬[Claims] (1) A projection lens for enlarging and projecting an image projected on a cathode ray tube onto a screen, comprising: a concave lens;
A convex meniscar lens having a concave surface on the concave lens side, a first convex lens having convex surfaces on both sides, and a second convex lens are sequentially arranged, and a predetermined distance is formed between the first convex lens and the second convex lens. The interval is 1. A projection lens characterized in that it is configured such that a mirror can be provided between the second convex lenses. (2) In claim (1), the predetermined interval TH is the full aperture diameter of the surface on the convex lens side, - the full aperture diameter of the surface of the second convex lens on the first convex lens side. A projection lens characterized by: (8) In claim (1) or (2), the surface curvature radius, total aperture diameter, surface spacing, refractive index, and aspherical coefficient have values shown in the table below, and the F number is A projection lens characterized in that 0.95. However, 81 a Sj a Sl a 8? represents one surface of each lens on the cathode ray tube side, s, I
s, IS, , S represent the other surface of each of the lenses. The spherical coefficients each have the values shown in the table below, and the F number is 0.9.
5. A projection lens characterized in that: However, 81*8@*"l*"Y represents one surface of each of the lenses on the cathode ray tube side;
4 *S, , S represents the other surface of each of the lenses. Furthermore, in the above table, the surface S is a value for the aperture stop. , jealousy
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8227882A JPS58198017A (en) | 1982-05-15 | 1982-05-15 | Projection lens |
| US06/494,447 US4620773A (en) | 1982-05-15 | 1983-05-13 | Projection lens for projection television |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8227882A JPS58198017A (en) | 1982-05-15 | 1982-05-15 | Projection lens |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58198017A true JPS58198017A (en) | 1983-11-17 |
| JPH0548449B2 JPH0548449B2 (en) | 1993-07-21 |
Family
ID=13770030
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8227882A Granted JPS58198017A (en) | 1982-05-15 | 1982-05-15 | Projection lens |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58198017A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6073514A (en) * | 1983-09-30 | 1985-04-25 | Hitachi Ltd | Lens for projection television |
| JPS60220306A (en) * | 1984-04-18 | 1985-11-05 | Konishiroku Photo Ind Co Ltd | Projection lens for television projector |
| JPS619613A (en) * | 1984-06-25 | 1986-01-17 | Canon Inc | Projecting lens |
| JPS6271915A (en) * | 1985-09-25 | 1987-04-02 | Hitachi Ltd | Optical system for projection type television |
| US4704009A (en) * | 1984-12-05 | 1987-11-03 | Matsushita Electric Industrial Co., Ltd. | Projection lens |
| US4733953A (en) * | 1985-02-06 | 1988-03-29 | Matsushita Electric Industrial Co., Ltd. | Color corrected projection lens |
| JPH02250015A (en) * | 1989-03-23 | 1990-10-05 | Matsushita Electric Ind Co Ltd | Projection lens and projection type display device using this projection lens |
| KR100317025B1 (en) * | 1999-04-19 | 2001-12-22 | 구자홍 | Projection Television System of Thin Type using Keystone |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4995533A (en) * | 1972-10-20 | 1974-09-10 | ||
| JPS5734515A (en) * | 1980-08-09 | 1982-02-24 | Minolta Camera Co Ltd | Refracting index type optical system for video projector |
-
1982
- 1982-05-15 JP JP8227882A patent/JPS58198017A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4995533A (en) * | 1972-10-20 | 1974-09-10 | ||
| JPS5734515A (en) * | 1980-08-09 | 1982-02-24 | Minolta Camera Co Ltd | Refracting index type optical system for video projector |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6073514A (en) * | 1983-09-30 | 1985-04-25 | Hitachi Ltd | Lens for projection television |
| JPH0578010B2 (en) * | 1983-09-30 | 1993-10-27 | Hitachi Ltd | |
| JPS60220306A (en) * | 1984-04-18 | 1985-11-05 | Konishiroku Photo Ind Co Ltd | Projection lens for television projector |
| JPH0316002B2 (en) * | 1984-04-18 | 1991-03-04 | Konishiroku Photo Ind | |
| JPS619613A (en) * | 1984-06-25 | 1986-01-17 | Canon Inc | Projecting lens |
| US4704009A (en) * | 1984-12-05 | 1987-11-03 | Matsushita Electric Industrial Co., Ltd. | Projection lens |
| US4733953A (en) * | 1985-02-06 | 1988-03-29 | Matsushita Electric Industrial Co., Ltd. | Color corrected projection lens |
| JPS6271915A (en) * | 1985-09-25 | 1987-04-02 | Hitachi Ltd | Optical system for projection type television |
| JPH02250015A (en) * | 1989-03-23 | 1990-10-05 | Matsushita Electric Ind Co Ltd | Projection lens and projection type display device using this projection lens |
| KR100317025B1 (en) * | 1999-04-19 | 2001-12-22 | 구자홍 | Projection Television System of Thin Type using Keystone |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0548449B2 (en) | 1993-07-21 |
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