JPS59101577U

JPS59101577U - Lens for video projector

Info

Publication number: JPS59101577U
Application number: JP19567782U
Authority: JP
Inventors: 浩二平田
Original assignee: 株式会社日立製作所
Priority date: 1982-12-27
Filing date: 1982-12-27
Publication date: 1984-07-09

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of the drawing]

第１図は、従来のビデオプロジェクタ−の主要図、−第
２図は、従来のＣＲＴと、組レンズを構成゛する単レン
ズ及び光学素子の配置図、第３図は、高利得スクリーン
の入射光に対する射出光の輝度分布図、第４図は従来の
グイクロイックミラーを使用したビデオプロジェクタ−
の主要図、第５図は、本考案の一実施例によるビデオプ
ロジェクタ−の主要図、第６図は、本考案による組レン
ズを構成する単レンズ及び光学素子、ＣＲＴの配置の一
例を示す説明図である。１・・・ブルーＣＲＴ、２・・・グリーンＣＲＴ、３・
・・レッドＣＲＴ、４・・・スクリーン、５．５’−・
・・グイクロイックミラー、６・・・出力レンズ、７・
・・ミラー、８−１．８１・・・凸レンズ、９−１．９
−２・・・入力レンズ、１０・・・ＣＲＴ、ＩＱ−１・
・・ブルーＣＲＴ。１０−２・・・レッドＣＲＴ、　ｌ、　　ｌ’・・・ブ
ルー周辺光、２．２’−・・グリーン周辺光、３．３′
・・・レッド周辺光、４．４′・・・シアン周辺光。琴　　−４−図′　　　　−Figure 1 is a main diagram of a conventional video projector, - Figure 2 is a layout diagram of a conventional CRT, a single lens and optical elements that make up a lens set, and Figure 3 is a diagram showing the incidence of a high-gain screen. Figure 4 is a diagram of the luminance distribution of the emitted light relative to the light.
FIG. 5 is a main diagram of a video projector according to an embodiment of the present invention, and FIG. 6 is an explanation showing an example of the arrangement of a single lens, optical elements, and CRT constituting a lens assembly according to the present invention. It is a diagram. 1... Blue CRT, 2... Green CRT, 3...
・・Red CRT, 4...Screen, 5.5'-・
... Guicroic mirror, 6... Output lens, 7.
... Mirror, 8-1.81 ... Convex lens, 9-1.9
-2...Input lens, 10...CRT, IQ-1.
...Blue CRT. 10-2...Red CRT, l, l'...Blue ambient light, 2.2'-...Green ambient light, 3.3'
...Red ambient light, 4.4'...Cyan ambient light. Koto -4-Figure'-

Claims

[Scope of utility model registration request]

One cathode ray tube is assigned to each of the primary colors of color television, and each of the three cathode ray tubes is associated with a lens set consisting of a plurality of single lenses. In a video projector that enlarges and projects an image onto a screen, an input lens 411B-1, 9-i and an input lens group are used as a lens assembly that integrates two of the lens assembly, a lens assembly for blue and a lens assembly for red. [2, 9-2, and the two sets of input lenses a-
1, 9-1 and 8-2. A video projector lens characterized in that a guichroic mirror 5' is arranged between 9-2 and an output lens group 6.