JPH01267589A - Video projector - Google Patents

Video projector

Info

Publication number
JPH01267589A
JPH01267589A JP63097435A JP9743588A JPH01267589A JP H01267589 A JPH01267589 A JP H01267589A JP 63097435 A JP63097435 A JP 63097435A JP 9743588 A JP9743588 A JP 9743588A JP H01267589 A JPH01267589 A JP H01267589A
Authority
JP
Japan
Prior art keywords
lens group
front lens
light image
projection
projector
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.)
Pending
Application number
JP63097435A
Other languages
Japanese (ja)
Inventor
Katsumi Kurematsu
克巳 榑松
Nobuo Minoura
信夫 箕浦
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Canon Inc
Original Assignee
Canon Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Canon Inc filed Critical Canon Inc
Priority to JP63097435A priority Critical patent/JPH01267589A/en
Publication of JPH01267589A publication Critical patent/JPH01267589A/en
Pending legal-status Critical Current

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  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)

Abstract

PURPOSE:To easily set and adjust the projector and to also correct convergence by forming the projector of an optical system which synthesizes respective light images of red, green, and blue transmitted through three rear lens groups, one front lens group for projection and a rear lens group together and guides the synthesized light image to the front lens group. CONSTITUTION:An optical synthesizing system is provided with the rear lens groups 6a-6c in front of light image projecting devices 1a-1c, and light images on the light image projecting devices are converged by those lens groups and synthesize by using dichroic mirrors 7 and 8, and the synthesized image is guided to the front lens group 5. Then this front lens group 5 projects the synthesized light image (video) of R, G, and B on a screen. Therefore, the television image can be projected by one projection lens (front lens group 5). Consequently, the need for complicate convergence correction which is performed electrically is eliminated and the projector main body is easily set and adjusted for the screen.

Description

【発明の詳細な説明】 [産業上の利用分野] 本発明はテレビジョン映像をスクリーン上に投影するビ
デオプロジェクタ−に関するものである。
DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a video projector that projects television images onto a screen.

[従来の技術] 従来、このようなタイプのビデオプロジェクタ−は、第
2図に示すように光像投写装置としてのR(赤)・G(
緑)・B(青)3)のCRTla、Ib、lcに対し、
それぞれ3つの投影レンズ系2a、2b、2cを備えた
構成を取っている。
[Prior Art] Conventionally, this type of video projector uses R (red) and G (light image projection devices) as shown in FIG.
For CRTla, Ib, lc of green) and B (blue) 3),
Each of them has a configuration including three projection lens systems 2a, 2b, and 2c.

[発明が解決しようとしている問題点]しかしながら、
上記従来例では、CRTからのR−G−Bそれぞれの光
像を3つのレンズ系から投影する(3眼式)為、両端に
位置するCRTla・lc、レンズ系2a・2Cとスク
リーン3を結ぶ光軸は、第3図に示す如く中央に位置す
るCRT16のそれに対して傾きθ(交差角)を有する
為、そのままではスクリーン上の映像にカラーシフト及
び台形歪みが発生してしまう。
[Problem that the invention seeks to solve] However,
In the above conventional example, since the R, G, and B light images from the CRT are projected from three lens systems (trinocular system), the CRT la and lc located at both ends, the lens systems 2a and 2C, and the screen 3 are connected. Since the optical axis has an inclination θ (intersection angle) with respect to that of the CRT 16 located at the center as shown in FIG. 3, color shift and trapezoidal distortion will occur in the image on the screen if left as is.

そこで、これを電気的に補正する複雑なコンバーゼンス
補正を必要としていた。
Therefore, complicated convergence correction was required to electrically correct this.

また、この為、スクリーンに対するプロジェクタ−本体
のセツティング、調整等が非常に難しいという欠点を有
していた。
Additionally, this has the disadvantage that setting and adjusting the projector body relative to the screen is extremely difficult.

[問題点を解決するための手段] 本発明によれば、R,−G −83つの光像投写装置か
らのそれぞれの光像を歪み無く1つの投影用前側レンズ
群に導く合成光学系を設けることにより、この前側レン
ズ群からR−G−83つの光像を歪み無く重ね合わせて
投影するようにしたものである。
[Means for Solving the Problems] According to the present invention, a combining optical system is provided that guides each of the optical images from the three R, -G, and -8 optical image projection devices to one front lens group for projection without distortion. As a result, the three R-G-8 optical images are projected from this front lens group in a superimposed manner without distortion.

この合成光学系としては、R−G−Bの各光像投写装置
の前面にそれぞれ後側レンズ群を設け、このレンズ群に
より各光像投写装置上の光像を集束し、全反射ミラー、
ダイクロイックミラー又はハーフミラ−を用いてこれら
の光像を合成し、前側レンズ群に導き、この前側レンズ
群からR・G−Bの合成光像(映像)をスクリーン上に
投影するようにしている。
This synthetic optical system includes a rear lens group provided in front of each R-G-B light image projection device, which focuses the light image on each light image projection device, a total reflection mirror,
These light images are combined using a dichroic mirror or a half mirror and guided to the front lens group, from which a combined R, G-B light image (image) is projected onto a screen.

従って、本発明によれば、1本の投影用レンズ(前側レ
ンズ群)によりテレビジョン映像を投影することが可能
になる。
Therefore, according to the present invention, it is possible to project a television image using one projection lens (front lens group).

[実施例] 第1図は本発明第1の実施例であり、1a・1b・1c
はそれぞれR−G−Bの投写用CRT(陰極線管)、5
は前側レンズ群、6a・6b・6CはそれぞれCRTI
a−1b・Icの前面に設置された後側レンズ群、7・
8はダイクロイックミラーである。また図中、−点鎖線
は光軸を表わしている。
[Example] Figure 1 shows the first example of the present invention, 1a, 1b, 1c.
are R-G-B projection CRTs (cathode ray tubes), 5
is the front lens group, 6a, 6b, and 6C are each CRTI
The rear lens group 7. installed in front of a-1b.Ic.
8 is a dichroic mirror. Moreover, in the figure, the dashed-dotted line represents the optical axis.

まず、CRTlaからはRの光像が投写され、この光像
はレンズ群6aにより集束又は平行光線化され、光軸に
対し45°配置のダイクロイックミラー8に到る。この
ダイクロイックミラー8はR光のみを反射し、他の色光
を透過する特性のものを州いている。そこでこのRの光
像はここで反射され、図中矢印の如く同じく45°配置
のダイクロイックミラー7に到る。
First, an R light image is projected from the CRTla, and this light image is focused or parallelized by the lens group 6a, and reaches the dichroic mirror 8 arranged at 45 degrees with respect to the optical axis. This dichroic mirror 8 has a characteristic of reflecting only R light and transmitting other color lights. Therefore, this R light image is reflected here and reaches the dichroic mirror 7 which is also arranged at 45° as shown by the arrow in the figure.

このダイクロイックミラー7はB光のみを反射し、他の
色光を透過する特性のものを用いている為、Rの光像は
このダイクロイックミラー7を透過し前側レンズ群5に
到る。そしてこの前側レンズ群5を通じて、前方のスク
リーン(不図示)に投影される。
Since this dichroic mirror 7 has a characteristic of reflecting only B light and transmitting other color lights, the R light image passes through this dichroic mirror 7 and reaches the front lens group 5. The light is then projected onto a screen in front (not shown) through this front lens group 5.

次に、CRTlbからはGの光像が投写され、レンズ群
6bにより集束又は平行光線化され、さンズ群5に到り
、これを通してスクリーンに投影される。ここでダイク
ロイックミラー8.7は前述したようにG光に対しては
両ミラー共、透過性を有している。
Next, a G light image is projected from the CRTlb, is focused or parallelized by the lens group 6b, reaches the lens group 5, and is projected onto the screen through this. Here, as described above, both dichroic mirrors 8.7 are transparent to G light.

CRTlcからはBの光像が投写され、レンズ群6cに
より集束又は平行光線化された後、ダイクロイックミラ
ー8によって反射され、レンズ群5に到る。そしてこれ
を通じてスクリーンに投影される。
A B light image is projected from the CRTlc, is focused or parallelized by the lens group 6c, is reflected by the dichroic mirror 8, and reaches the lens group 5. The image is then projected onto the screen through this.

従って、CRTla・1b・ICからのR・G−Bの各
光像は前側レンズ群5の手前で歪み無く合成され、この
合成された光像が投影されることになる。
Therefore, the R, G-B light images from the CRTla, 1b, and IC are combined without distortion before the front lens group 5, and this combined light image is projected.

この為、1本の前側レンズ群を投影用レンズとした1眼
式のプロジェクタ−が構成できる。そこで、この1本の
前側レンズ群内にフォーカス調整機構及びズーム機構等
を集中して設けることが可能となり、プロジェクタ−の
セツティング調整等が非常に容易に行えるようにな−る
Therefore, a single-lens projector can be constructed in which one front lens group is used as a projection lens. Therefore, it becomes possible to centrally provide a focus adjustment mechanism, a zoom mechanism, etc. within this single front lens group, and it becomes possible to perform setting adjustments of the projector, etc. very easily.

また、前述した従来例の3眼式のプロジェクタ−と比較
して交差角θ(第3図)が存在しない為、これに起因す
る台形歪み・カラーシスト等が無くなり、コンバーゼン
ス補正が非常に容易になる。
Also, compared to the conventional three-lens projector described above, since there is no intersection angle θ (Figure 3), trapezoidal distortion, color cyst, etc. caused by this are eliminated, making convergence correction very easy. Become.

さらに、最近、1管のカラーCRT(シャドウマスクタ
イプ)を投写用CRTとした、1眼式のプロジェクタ−
が発表されているが、これに対し、本発明のものはR−
G−BのCRTを3管用いている為、明るさと解像度の
点でこれに断然月斉っている。
Furthermore, recently, single-lens projectors have been developed that use a single-tube color CRT (shadow mask type) as the projection CRT.
has been announced, but on the other hand, the present invention has R-
Since it uses three G-B CRT tubes, it is definitely on par with G-B in terms of brightness and resolution.

尚、本構成のプロジェクタ−において、CRTIa−1
b−1cと後側レンズ群6a・6b・6cとの間に、所
謂オプティカルカップリングもしくはリキッドクーリン
グ等のFl、玲機構を設けることについては何ら差支え
ない。
In addition, in the projector with this configuration, CRTIa-1
There is no problem in providing a so-called optical coupling or liquid cooling mechanism between b-1c and the rear lens groups 6a, 6b, and 6c.

また、本構成の中で、ダイクロイックミラーの替わりに
通常のハーフミラ−を用いることも可能である。
Furthermore, in this configuration, it is also possible to use a normal half mirror instead of the dichroic mirror.

[他の実施例] 第4・5図は第2の実施例であり、9a・9Cは光軸に
対し45°配置の全反射ミラーである。
[Other Embodiments] FIGS. 4 and 5 show a second embodiment, in which 9a and 9C are total reflection mirrors arranged at 45 degrees with respect to the optical axis.

本例では、実施例1に対し、RのCRTlaとBのCR
Tlcを横向きとし、Rの光像をミラー9aにて折り返
してダイクロイックミラー8に導き、Bの光像をミラー
9Cによって折り返し、ダイクロイックミラー7に導い
ている。その他は実施例1に同様であるが、全体構成と
して上下方向のコンパクト化を計っている。
In this example, in contrast to Example 1, R's CRTla and B's CR
Tlc is oriented horizontally, the R light image is reflected by a mirror 9a and guided to the dichroic mirror 8, and the B light image is reflected by a mirror 9C and guided to the dichroic mirror 7. The rest is the same as in Example 1, but the overall configuration is designed to be more compact in the vertical direction.

第6図は第3の実施例であり、前側レンズ群5、ダイク
ロイックミラー7・8、GのCRTlbの並びが最上部
に来る構成としている。
FIG. 6 shows a third embodiment, in which the front lens group 5, dichroic mirrors 7 and 8, and G CRTlb are arranged at the top.

この為に、RのCRTlaとBのCRTlcは下側から
その光像を直接ダイクロイックミラー8とダイクロイッ
クミラー7に投写するようにしている。
For this reason, the R CRTla and the B CRTlc project their optical images directly onto the dichroic mirror 8 and the dichroic mirror 7 from below.

この様な構成とすることにより、投影用前側レンズ群の
位置をプロジェクタ−として最適な、装置本体の最上部
に持って来ることが可能となる。
With this configuration, it is possible to bring the front lens group for projection to the top of the main body of the apparatus, which is optimal for use as a projector.

第7・8図は第4の実施例であり、9dは全反射ミラー
である。
7 and 8 show the fourth embodiment, and 9d is a total reflection mirror.

ここでは、第3の実施例と同様に、前側レンズ群5、ダ
イクロイックミラー7・8、GのCRTlbの並びが最
上部に来ているが、この並びの光軸に対し、他のRとB
の光像を下側及び横側から投写してR−G−Bの各光像
を合成している。さらにR−BのCRTla・IC共に
横方向前向き設置として居り、Bの光像は45°配置の
全反射ミラー9cによってダイクロイックミラー7に導
かれ、Rの光像は全反射ミラー9a及び9dによってダ
イクロイックミラー8に導かれる。これにより各色光像
が合成され、前側レンズ群5を通してスクリーンに投影
される。
Here, as in the third embodiment, the front lens group 5, dichroic mirrors 7 and 8, and the G CRTlb are arranged at the top, but with respect to the optical axis of this arrangement, the other R and B
The RGB light images are combined by projecting the light images from below and from the sides. Furthermore, both the R-B CRTla and IC are installed facing forward in the lateral direction, and the light image of B is guided to the dichroic mirror 7 by a total reflection mirror 9c arranged at 45 degrees, and the light image of R is guided to the dichroic mirror 7 by total reflection mirrors 9a and 9d. Guided by Mirror 8. As a result, the light images of each color are combined and projected onto the screen through the front lens group 5.

この様な構成にすると、投影方向から見て、各CRTの
配列がL字又は逆り字型となる為、投影用前側レンズの
位置を上部かつ左右の端部に持って来ることが可能とな
る。
With this configuration, each CRT is arranged in an L-shape or inverted-shape when viewed from the projection direction, so the front lens for projection can be positioned at the top and at the left and right ends. Become.

ところで、上記の各実施例はほんの一例に過ぎず、ダイ
クロイックミラー、全反射ミラー、ハーフミラー、各C
RT、後側レンズ群、等その配置、並び、順序、構成等
はこれらに限られるものではない。少なくとも、前側レ
ンズ群と後側レンズ群との間で、各色光像をこれらの光
学パーツ・モジュール等にて歪み無く合成するものであ
れば良い。
By the way, each of the above-mentioned embodiments is just an example, and dichroic mirror, total reflection mirror, half mirror, each C
The arrangement, arrangement, order, configuration, etc. of the RT, rear lens group, etc. are not limited to these. At least, it is sufficient that each color light image is combined without distortion between the front lens group and the rear lens group using these optical parts/modules.

尚、前側レンズ群の構成1群構成である必要はなく、ズ
ーム機構等を含む多群構成であっても良いことは勿論で
ある。
It should be noted that the front lens group does not necessarily have to have a one-group structure, and may of course have a multi-group structure including a zoom mechanism and the like.

また、本実施例においては光像投写装置としてCRTを
用いたが、これに限られる訳ではなく、LCD、EL、
プラズマ等を応用した各種デイスプレィデバイスを用い
ても良い。
In addition, although a CRT was used as the optical image projection device in this embodiment, it is not limited to this, and LCD, EL,
Various display devices using plasma or the like may be used.

[発明の効果] 以上説明したように、R−G−83つのCRTからの各
光像を歪み無く合成して1つの投影用前側レンズ群から
投影させることにより、1、プロジェクタ−のセツティ
ング・調整が非常に容易になる。
[Effects of the Invention] As explained above, by combining the respective optical images from the three RG-8 CRTs without distortion and projecting them from one front lens group for projection, 1. the setting of the projector; Adjustment becomes very easy.

2、コンバーゼンズ補正が非常に容易になる。2. Convergence correction becomes very easy.

3 ズーム化が容易に行なえる。3. Zooming can be done easily.

等の効果がある。There are other effects.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本発明第1の実施例の光学断面図、′fS2図
・第3図は従来例の説明図、第4図・第5図・第6図は
別の実施例の光学断面図、 第7図・第8図は別の実施例の斜視図。 Ia、Ib、lcはそれぞれR−G−Bの投写用CRT
、2a、2b、2cは投影用レンズ、3はスクリーン、
4は外装、5は前側レンズ群1.。 6a、6b、6cは後側レンズ群、7.8はダイクロイ
ックミラー又はハーフミラー、9a。 9b、9c、9dは全反射ミラー。
Figure 1 is an optical sectional view of the first embodiment of the present invention, 'fS2 and 3 are explanatory diagrams of the conventional example, and Figures 4, 5, and 6 are optical sectional views of another embodiment. , FIGS. 7 and 8 are perspective views of another embodiment. Ia, Ib, and lc are R-G-B projection CRTs, respectively.
, 2a, 2b, 2c are projection lenses, 3 is a screen,
4 is the exterior, 5 is the front lens group 1. . 6a, 6b, 6c are rear lens groups, 7.8 is a dichroic mirror or half mirror, and 9a. 9b, 9c, and 9d are total reflection mirrors.

Claims (4)

【特許請求の範囲】[Claims] (1)少なくとも、赤・緑・青の光像投写装置と、それ
ぞれの該投写装置の前面に設置され該投写装置からの赤
・緑・青の各光像を集束又は平行光線化する3つの後側
レンズ群と、1つの投影用前側レンズ群と、該後側レン
ズ群を透過した赤・緑・青の各光像を合成して該前側レ
ンズ群に導く光学系から成ることを特徴とするビデオプ
ロジェクター。
(1) At least a red, green, and blue light image projection device, and three devices installed in front of each projection device to converge or parallelize the red, green, and blue light images from the projection device. It is characterized by comprising a rear lens group, one front lens group for projection, and an optical system that combines the red, green, and blue light images transmitted through the rear lens group and guides them to the front lens group. video projector.
(2)上記後側レンズ群を透過した赤・緑・青の各光像
を1つの前側レンズ群に導く光学系 として、ダイクロイックミラー、ハーフミ ラー、全反射ミラー等を用いる特許請求の範囲第1項記
載のビデオプロジェクター。
(2) The first claim uses a dichroic mirror, a half mirror, a total reflection mirror, etc. as an optical system that guides each of the red, green, and blue light images transmitted through the rear lens group to one front lens group. Video projector as described in section.
(3)上記赤・緑・青の光像投写装置のうち、少なくと
も最上部に位置する光像投写装置の前面に対応する位置
に、上記前側レンズ群を配置した特許請求の範囲第1項
及び第2項記載のビデオプロジェクター。
(3) The front lens group is disposed at a position corresponding to the front surface of at least the topmost light image projection device among the red, green, and blue light image projection devices. The video projector according to item 2.
(4)上記前側レンズ群内にフォーカス調整機構及びズ
ーム機構を設けた特許請求の範囲第1項、第2項及び第
3項記載のビデオプロジェクター。
(4) The video projector according to claims 1, 2, and 3, wherein a focus adjustment mechanism and a zoom mechanism are provided in the front lens group.
JP63097435A 1988-04-19 1988-04-19 Video projector Pending JPH01267589A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP63097435A JPH01267589A (en) 1988-04-19 1988-04-19 Video projector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP63097435A JPH01267589A (en) 1988-04-19 1988-04-19 Video projector

Publications (1)

Publication Number Publication Date
JPH01267589A true JPH01267589A (en) 1989-10-25

Family

ID=14192294

Family Applications (1)

Application Number Title Priority Date Filing Date
JP63097435A Pending JPH01267589A (en) 1988-04-19 1988-04-19 Video projector

Country Status (1)

Country Link
JP (1) JPH01267589A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0475378U (en) * 1990-11-14 1992-07-01

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4211803Y1 (en) * 1964-07-31 1967-07-03
JPS575488A (en) * 1980-06-12 1982-01-12 Matsushita Electric Ind Co Ltd Television picture projector

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4211803Y1 (en) * 1964-07-31 1967-07-03
JPS575488A (en) * 1980-06-12 1982-01-12 Matsushita Electric Ind Co Ltd Television picture projector

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0475378U (en) * 1990-11-14 1992-07-01

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