JPH0428083B2 - - Google Patents
Info
- Publication number
- JPH0428083B2 JPH0428083B2 JP57017423A JP1742382A JPH0428083B2 JP H0428083 B2 JPH0428083 B2 JP H0428083B2 JP 57017423 A JP57017423 A JP 57017423A JP 1742382 A JP1742382 A JP 1742382A JP H0428083 B2 JPH0428083 B2 JP H0428083B2
- Authority
- JP
- Japan
- Prior art keywords
- projection
- cathode ray
- ray tube
- image
- projection lens
- 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.)
- Expired - Lifetime
Links
- 230000003287 optical effect Effects 0.000 claims description 17
- 238000010586 diagram Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Description
【発明の詳細な説明】
本発明はブラウン管映像をレンズ系で拡大する
投写型テレビジヨン装置において、特にレンズ系
に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a projection television apparatus that magnifies a cathode ray tube image using a lens system, and particularly to a lens system.
従来技術による投写用レンズを用いた投写型テ
レビジヨン装置は第１図に示したようになつてい
た。 A conventional projection television apparatus using a projection lens is shown in FIG.
１−１，１−２，１−３は投写ブラウン管で
各々緑、赤、青色の単色映像を映し出す。２−
１，２−２，２−３は投写用レンズ、３は透過形
スクリーンである。 1-1, 1-2, and 1-3 are projection cathode ray tubes that project monochromatic images of green, red, and blue, respectively. 2-
1, 2-2, and 2-3 are projection lenses, and 3 is a transmission screen.
緑、赤、青３色映像を投写用レンズ２−１，２
−２，２−３で各々拡大して透過スクリーン３上
に結像してその透過像を観視するものである。 Lenses 2-1, 2 for projecting green, red, and blue three-color images
-2 and 2-3 magnifications are formed on the transmission screen 3, and the transmitted images are viewed.
そして、投写用レンズ２−１，２−２，２−３
は例えば特開昭55−124114号に開示されているよ
うに、投写ブラウン管１−１，１−２，１−３に
近い所に像面を平坦化する負の光学的パワーを有
するものがある。さらに、通常はこれら投写ブラ
ウン管１−１，１−２，１−３および投写用レン
ズ２−１，２−２，２−３は互いに軸をほぼ共通
とするよう設定される。 And projection lenses 2-1, 2-2, 2-3
For example, as disclosed in Japanese Patent Application Laid-Open No. 124114/1982, there are some projection cathode ray tubes 1-1, 1-2, and 1-3 that have negative optical power to flatten the image plane. . Furthermore, normally these projection cathode ray tubes 1-1, 1-2, 1-3 and projection lenses 2-1, 2-2, 2-3 are set so that their axes are substantially common to each other.
しかし、第１図に示す如く赤、青色の映像光は
緑の映像光に対して１平面内でαの角度をなして
設置されるため、投写型テレビジヨン装置として
次の欠点があつた。 However, as shown in FIG. 1, the red and blue image lights are placed at an angle α in one plane with respect to the green image light, so the projection television apparatus has the following drawbacks.
(1) 赤、青映像光による映像は透過形スクリーン
３前方からみて、矩形映像とはならずスクリー
ン左右で倍率の異なるゆがんだ映像となる。(1) The image produced by the red and blue image lights, when viewed from the front of the transmissive screen 3, is not a rectangular image, but a distorted image with different magnifications on the left and right sides of the screen.
(2) 従つて、このままでは緑、赤、青の各々が互
いに重なりあわず、いわゆる色ズレをおこす。(2) Therefore, if things continue as they are, green, red, and blue will not overlap each other, causing so-called color misalignment.
(3) これを解決する手段として、赤、青の投写ブ
ラウン管１−２，１−３の蛍光面にあらかじめ
逆方向のゆがんだラスターを形成させるいわゆ
る補正回路、偏向ヨークを設けるが、その調整
がめんどうであつたり、コスト高になる。(3) As a means to solve this problem, a so-called correction circuit or deflection yoke is installed to form a distorted raster in the opposite direction on the fluorescent screens of the red and blue projection cathode ray tubes 1-2 and 1-3. It is troublesome and expensive.
(4) また、この補正も十分に満足できない場合が
多く、従つて色ズレの残留した画質の悪いもの
であつた。(4) Furthermore, this correction was often not satisfactory, resulting in poor image quality with remaining color misregistration.
本発明の目的は上記従来技術の欠点に鑑み、特
別の補正回路を不要とし、従つてコスト的にも有
利でかつ色ズレのない良好な画質を得る投写用レ
ンズを提供することにある。 SUMMARY OF THE INVENTION In view of the above-mentioned drawbacks of the prior art, it is an object of the present invention to provide a projection lens that does not require a special correction circuit, is cost-effective, and provides good image quality without color shift.
本発明は、投写用レンズを構成し、投写ブラウ
ン管に最も近い負の光学的パワーを有する素子の
光軸を、投写ブラウン管の管軸および投写用レン
ズを構成する他の素子群の光軸から平行にずらし
て投写用レンズを構成するものである。 The present invention makes the optical axis of the element that constitutes the projection lens and has negative optical power closest to the projection cathode ray tube parallel to the tube axis of the projection cathode ray tube and the optical axes of other element groups that constitute the projection lens. The projection lens is constructed by shifting the projection lens.
以下、本発明の一実施例を第２図、第３図によ
り説明する。第２図は本発明の原理説明図、第３
図は本発明による投写用レンズと投写ブラウン管
の相対位置関係を示す図で、２′，２″は投写用レ
ンズ、５は蛍光面、６は光軸が偏つている負の光
学的パワーを有する素子、７は投写用レンズを構
成する他の素子群、その他従来例と同一物には同
一の番号が付してある。 An embodiment of the present invention will be described below with reference to FIGS. 2 and 3. Figure 2 is a diagram explaining the principle of the present invention, Figure 3
The figure shows the relative positional relationship between a projection lens and a projection cathode ray tube according to the present invention, where 2' and 2'' are projection lenses, 5 is a phosphor screen, and 6 has negative optical power with a biased optical axis. Element 7 is another element group constituting the projection lens, and other elements that are the same as those in the conventional example are given the same numbers.
投写用レンズ２′，２″の光軸０−０′上に投写
ブラウン管１および投写用レンズ２′，２″を構成
する素子群７を配置する。そして、投写用レンズ
２′，２″を構成する負の光学的パワーを有する素
子６は該素子の光軸０1−０1′を先の光軸０−
０′からｈだけ平行にずらす。 The projection cathode ray tube 1 and the element group 7 constituting the projection lenses 2', 2'' are arranged on the optical axis 0-0' of the projection lenses 2', 2''. The element 6 having negative optical power constituting the projection lenses 2', 2'' has its optical axis 0 1 -0 1 ' aligned with the optical axis 0 -
Shift parallel by h from 0'.
この場合、物点P0、Q0の像点をP1、Q1とすと １／a1＋１／b1＝１／f1 ……(1) １／a2＋１／b2＝１／f2 ……(1) 倍率は m1＝b1／a1、m2＝b2／a2 ……(3)である。 In this case, if the image points of object points P 0 and Q 0 are P 1 and Q 1 , then 1/a 1 + 1/b 1 = 1/f 1 ...(1) 1/a 2 + 1/b 2 = 1 /f 2 ...(1) The magnification is m 1 =b 1 /a 1 , m 2 =b 2 /a 2 ...(3).
歪みのない画像を得るためにはm1＝m2とすれば
よい。(1)，(2)，(3)式からa1／f1＝a2／f2となれば
よい。In order to obtain an image without distortion, it is sufficient to set m 1 =m 2 . From equations (1), (2), and (3), it is sufficient if a 1 /f 1 =a 2 /f 2 .
図ではb1＞b2であるからa1＞a2とする必要があ
り、そのためには素子６の曲率半径r1およびr2を
適切に決めてf1＞f2とすることができ、従つて、
a1／f1＝a2／f2 ……(4)
とすることができる。 In the figure, since b 1 > b 2 , it is necessary to set a 1 > a 2 , and for this purpose, the radii of curvature r 1 and r 2 of the element 6 can be appropriately determined so that f 1 > f 2 , Therefore, it can be set as a 1 /f 1 =a 2 /f 2 (4).
式(1)〜式(3)から
１／m1−１／m2＝a1／f1−a2／f2
であるので式(4)から１／m1＝１／m2となるので
m1＝m2とすることができる。 From equations (1) to (3), 1/m 1 - 1/m 2 = a 1 /f 1 - a 2 /f 2 , so from equation (4), 1/m 1 = 1/m 2. So
It can be set as m 1 =m 2 .
すなわち、像Q1と像P1の大きさが同一となる
ので歪みのない画像が得られる。 That is, since the sizes of image Q 1 and image P 1 are the same, an image without distortion can be obtained.
従つて、赤、青色投写ブラウン管に本発明の投
写用レンズを用いれば赤、緑、青色の映像の大き
さが歪みなく同一の大きさに出来るので、特別の
補正回路を必要とすることなく色ズレのない良好
な画像が安価に得られる。 Therefore, if the projection lens of the present invention is used in a red and blue projection cathode ray tube, the sizes of red, green and blue images can be made to be the same size without distortion, so color correction can be performed without the need for a special correction circuit. Good images with no deviation can be obtained at low cost.
本発明によれば、投写用レンズを構成した投写
ブラウン管に最も近い負の光学的パワーを有する
素子の光軸を、投写ブラウン管の管軸および投写
用レンズを構成する他の素子群の光軸から平行に
ずらして投写用レンズを構成して用いるので、
赤、緑、青色の映像の大きさが歪みなく同一の大
きさに出来るので色ズレのない良好な画像が安価
に得られる効果がある。 According to the present invention, the optical axis of the element having negative optical power that is closest to the projection cathode ray tube that constitutes the projection lens is separated from the tube axis of the projection cathode ray tube and the optical axes of other element groups that constitute the projection lens. Since the projection lens is configured and used with parallel shifts,
Since the sizes of red, green, and blue images can be made the same size without distortion, there is an effect that a good image without color shift can be obtained at a low cost.
第１図は従来技術による投写用レンズを用いた
投写型テレビジヨン装置を示す構成図、第２図は
本発明の原理説明図、第３図は本発明による投写
用レンズと投写ブラウン管の相対位置関係を示す
構成図である。
１……１−１，１−２，１−３……投写ブラウ
ン管、２−１，２−２，２−３，２′，２″……投
写用レンズ、６……負の光学的パワーを有づる素
子、７……その他の素子群。
FIG. 1 is a configuration diagram showing a projection television apparatus using a projection lens according to the prior art, FIG. 2 is a diagram explaining the principle of the present invention, and FIG. 3 is a relative position of the projection lens and projection cathode ray tube according to the present invention. FIG. 3 is a configuration diagram showing the relationship. 1... 1-1, 1-2, 1-3... Projection cathode ray tube, 2-1, 2-2, 2-3, 2', 2''... Projection lens, 6... Negative optical power 7...Other element groups.
Claims (1)
ン装置の投写用レンズにおいて、上記投写ブラウ
ン管に最も近い箇所に負の光学的パワーを有する
素子を配置した複数の素子から成る投写用レンズ
にあつて、前記負の光学的パワーを有する素子の
光軸を、投写ブラウン管及び投写レンズを構成す
る他の素子から成る光軸と平行にずらして配置
し、上記投写レンズを投写型テレビジヨン装置の
赤用及び青用の投写ブラウン管に用い、色ズレを
なくしたことを特徴とする投写型テレビジヨン装
置の投写用レンズ。1. In a projection lens for a projection television device that magnifies a cathode ray tube image, the projection lens is composed of a plurality of elements in which an element having negative optical power is arranged at a location closest to the projection cathode ray tube. The optical axis of an element having an optical power of A projection lens for a projection television device, which is used in a projection cathode ray tube and is characterized by eliminating color shift.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1742382A JPS58136011A (en) | 1982-02-08 | 1982-02-08 | Lens for projection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1742382A JPS58136011A (en) | 1982-02-08 | 1982-02-08 | Lens for projection |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58136011A JPS58136011A (en) | 1983-08-12 |
| JPH0428083B2 true JPH0428083B2 (en) | 1992-05-13 |
Family
ID=11943598
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1742382A Granted JPS58136011A (en) | 1982-02-08 | 1982-02-08 | Lens for projection |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58136011A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012063974A1 (en) * | 2010-11-11 | 2012-05-18 | 東洋製罐株式会社 | Refilling pouch |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4753519A (en) * | 1984-09-27 | 1988-06-28 | Matsushita Electric Industrial Co., Ltd. | Optical system for projection television apparatus |
| NL8500453A (en) * | 1985-02-18 | 1986-09-16 | Philips Nv | PROJECTIVE SYSTEM. |
| JP2908570B2 (en) * | 1990-12-12 | 1999-06-21 | キヤノン株式会社 | External lens and image projection device |
| US20080011320A1 (en) * | 2006-07-13 | 2008-01-17 | Bouix Herve F | Shock absorber for cosmetic compact |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5412734A (en) * | 1977-05-09 | 1979-01-30 | Vockenhuber Karl | Objective lens for movie camera and movie camera having same |
| JPS56128914A (en) * | 1980-03-06 | 1981-10-08 | Minolta Camera Co Ltd | Projector lens for video projector |
-
1982
- 1982-02-08 JP JP1742382A patent/JPS58136011A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5412734A (en) * | 1977-05-09 | 1979-01-30 | Vockenhuber Karl | Objective lens for movie camera and movie camera having same |
| JPS56128914A (en) * | 1980-03-06 | 1981-10-08 | Minolta Camera Co Ltd | Projector lens for video projector |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012063974A1 (en) * | 2010-11-11 | 2012-05-18 | 東洋製罐株式会社 | Refilling pouch |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58136011A (en) | 1983-08-12 |
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