JPH03246531A - Projecting device - Google Patents

Projecting device

Info

Publication number
JPH03246531A
JPH03246531A JP2044009A JP4400990A JPH03246531A JP H03246531 A JPH03246531 A JP H03246531A JP 2044009 A JP2044009 A JP 2044009A JP 4400990 A JP4400990 A JP 4400990A JP H03246531 A JPH03246531 A JP H03246531A
Authority
JP
Japan
Prior art keywords
light
projection
projected
liquid crystal
optical
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
Application number
JP2044009A
Other languages
Japanese (ja)
Other versions
JP2983030B2 (en
Inventor
Teruo Hiruma
輝夫 晝馬
Yoshiji Suzuki
鈴木 義二
Tsutomu Hara
勉 原
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.)
Hamamatsu Photonics KK
Original Assignee
Hamamatsu Photonics KK
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 Hamamatsu Photonics KK filed Critical Hamamatsu Photonics KK
Priority to JP2044009A priority Critical patent/JP2983030B2/en
Publication of JPH03246531A publication Critical patent/JPH03246531A/en
Application granted granted Critical
Publication of JP2983030B2 publication Critical patent/JP2983030B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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  • Projection Apparatus (AREA)
  • Overhead Projectors And Projection Screens (AREA)
  • Liquid Crystal (AREA)

Abstract

PURPOSE:To utilize a non-transmissive type medium such as a handwritten document or a printed matter for a substance to be projected by irradiating the optical modulation part of an optical address type spatial optical modulator with light from a light source for projection and providing an optical system for readout and projection which projects the light read out from the optical modulation part to a projected image display part. CONSTITUTION:In the optical system 70 for readout and projection, the light from the light source 60 for projection is reflected by a mirror 72, inputted in a polarizing beam splitter 74 to be linearly polarized and then inputted in the liquid crystal layer 44 of the liquid crystal spatial optical modulator 40. while the incident light is reflected by a dielectric mirror 46 and passes through the liquid crystal layer(optical modulation part) 44 again, the phase of the light is modulated in accordance with the change of optical character and it becomes the readout light from the liquid crystal layer 44. Then, it passes through a wavelength variable filter 50 and a half mirror 94 and is reflected by the beam splitter 74, then it is enlarged and projected on a screen 75 after passing through a projection lens 6. Thus, the non-transmissive type medium such as the handwritten document and the printed matter is utilized for the substance to be projected and the range of use is extended.

Description

【発明の詳細な説明】 「産業上の利用分野」 本発明は投影装置(例えばオーバーヘッドプロジェクタ
−)の改良に関するものである。
DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to improvements in projection devices (for example, overhead projectors).

「従来の技術」 従来のオーバーヘッドプロジェクタ−は1例えば第2図
に示すように、投影用光源10からの光をミラー12.
14で反射させることによって、載置台15上のフレネ
ルレンズ16および被投影体(例えば0HP(オーバー
ヘッドプロジェクタ−)シート)17を透過させ、この
透過光を投影レンズ18および投影ミラー20を介して
投影像表示部としてのスクリーン21上に投影していた
``Prior Art'' A conventional overhead projector converts light from a projection light source 10 into a mirror 12, for example, as shown in FIG.
14, the transmitted light is transmitted through a Fresnel lens 16 on a mounting table 15 and a projection object (for example, an OHP (overhead projector) sheet) 17, and this transmitted light is transmitted through a projection lens 18 and a projection mirror 20 to form a projected image. The image was projected onto a screen 21 serving as a display section.

「発明が解決しようとする課題」 しかしながら、第2図に示す従来装置では、被投影体1
7の透過光をスクリーン21に投影するようにしていた
ので、被投影体17として透過型の媒体しか利用するこ
とができず、不透明な紙に書かれた文書(例えば白紙に
書かれた手書き文書や印刷物の任意の頁の文書など)や
不透明な立体表面の形状や模様のような不透過型の媒体
を投影することができないという問題点があった。また
、従来の被投影体17は、透明なプラスチックフィルム
にコピー機で文書を焼き付けたものや、透明なプラスチ
ックフィルムにフェルトペンで文書や図形を書き込んだ
ものなので、被投影体17の作成が面倒であるとともに
コスト高になるという問題点があった。
"Problems to be Solved by the Invention" However, in the conventional apparatus shown in FIG.
Since the transmitted light of 7 is projected onto the screen 21, only a transparent medium can be used as the projection object 17, and documents written on opaque paper (for example, handwritten documents written on blank paper) There is a problem in that it is not possible to project opaque media such as documents (or documents on arbitrary pages of printed matter) or opaque three-dimensional surface shapes or patterns. In addition, the conventional projection object 17 is a transparent plastic film with a document printed on it using a copy machine, or a transparent plastic film with documents and figures written on it using a felt-tip pen, so creating the projection object 17 is troublesome. However, there was a problem in that the cost was high.

本発明は上述の問題点に鑑みてなされたもので、手書き
文書や印刷物のような不透過型の媒体も被投影体に利用
することのできる、用途範囲の広い投影装置を提供する
ことを目的とするものである。
The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a projection device with a wide range of uses, which can also be used as an object to be projected on non-transparent media such as handwritten documents and printed matter. That is.

「課題を解決するための手段」 本発明による投影装置は、被投影体からの光をアドレス
部に書き込むことによって、光変調部の光学的性質が変
化する光アドレス型空間光変調器と、投影用光源からの
光を前記光アドレス型空間光変調器の光変調部に照射す
ることによって、前記光変調部から読^出した光を投影
像表示部に投影する読出し投影用光学系とを具備してな
ることを特徴とするものである。そして、カラー表示を
可能にするために、被投影体からの光が光アドレス型空
間光変調器のアドレス部に至る光路中と、投影用光源か
らの光が光アドレス型空間光変調器の光変調部を介して
投影像表示部に至る光路中とのそれぞれに、印加電圧の
切り換えで透過波長域が切り換えられる波長可変フィル
タを挿入する。
"Means for Solving the Problems" A projection apparatus according to the present invention includes an optically addressed spatial light modulator in which the optical properties of a light modulation section are changed by writing light from a projection target into an address section; a readout projection optical system that projects light read from the light modulation section onto a projection image display section by irradiating light from a light source to the light modulation section of the optically addressed spatial light modulator. It is characterized by: In order to enable color display, the light from the object to be projected is in the optical path leading to the address section of the optically addressed spatial light modulator, and the light from the projection light source is the optical path of the optically addressed spatial light modulator. Variable wavelength filters whose transmission wavelength ranges can be switched by changing the applied voltage are inserted in each of the optical paths leading to the projection image display section via the modulation section.

また、被投影体への照明用光源を省略するために、投影
用光源の光の一部を被投影体に照射する照明用光学系を
設ける。また、光アドレス型空間光変調器への書き込み
光と、光アドレス型空間光変調器からの読み出し光のフ
ォーカス調節を容易にするために、光アドレス型空間光
変調器の光変調部から読み出した光の一部をモニタ像表
示部に導くモニタ用光学系を設ける。
Furthermore, in order to omit a light source for illuminating the object to be projected, an optical system for illumination is provided to irradiate part of the light from the light source for projection onto the object to be projected. In addition, in order to facilitate focus adjustment of the write light to the optically addressed spatial light modulator and the readout light from the optically addressed spatial light modulator, the A monitoring optical system is provided that guides a portion of the light to a monitor image display section.

「作用」 手書き文書や印刷物などの被投影体からの光(例えば反
射光)が、書き込み光として光アドレス型空間光変調器
のアドレス部に入力すると、光アドレス型空間光変調器
の光変調部の光学的性質が変化する。この状態において
、読出し投影用光学系は、投影用光源からの光を光アド
レス型空間光変調器の光変調部に照射し、光変調部から
読み出した光を投影像表示部に投影する。そして、被投
影体からの光がアドレス部に至る光路中と、投影用光源
からの光が光変調部を介してスクリーン上に至る光路中
とに波長可変フィルタを挿入した場合には、カラー表示
が可能になる。また、投影用光源の光の一部を被投影体
に照射する照明用光学系を設けた場合には、被投影体へ
の照明用光源を別に設けなくてもよい。また、光アドレ
ス型空間光変調器の光変調部から読み出した光の一部を
モニタ像表示部に導くモニタ用光学系を設けた場合には
、光アドレス型空間光変調器への書き込み光と、光アド
レス型空間光変調器からの読み出し光のフォーカス調節
を容易にすることができる。
"Operation" When light (e.g. reflected light) from a projected object such as a handwritten document or printed matter is input as writing light into the address section of the optically addressed spatial light modulator, the light modulating section of the optically addressed spatial light modulator optical properties change. In this state, the reading projection optical system irradiates the light modulation section of the optically addressed spatial light modulator with light from the projection light source, and projects the light read out from the light modulation section onto the projection image display section. If a variable wavelength filter is inserted in the optical path of the light from the object to be projected to the address section and the optical path of the light from the projection light source to the screen via the light modulation section, color display is possible. becomes possible. Furthermore, when an illumination optical system is provided that irradiates a part of the light from the projection light source onto the object to be projected, there is no need to separately provide a light source for illuminating the object to be projected. In addition, if a monitoring optical system is provided that guides a part of the light read out from the light modulation section of the optically addressed spatial light modulator to the monitor image display section, the writing light to the optically addressed spatial light modulator and the , it is possible to easily adjust the focus of the readout light from the optically addressed spatial light modulator.

r実施例」 以下、本発明の一実施例を第1図を用いて説明する。r Example” An embodiment of the present invention will be described below with reference to FIG.

第1図において、22は手書き文書や印刷物などの被投
影体で、この被投影体22は、載置台23上に固定され
ている。前記被投影体22の上部には、対物レンズ24
.波長可変フィルタ30、光アドレス型空間光変調器と
しての液晶空間光変調器40および波長可変フィルタ5
0が順次設けられている。前記波長可変フィルタ30.
50は、いわゆるカラーフィルタで、それぞれ対応する
電源(図示省略)からの印加電圧で屈折率が変化する液
晶セル34.54と。
In FIG. 1, reference numeral 22 denotes an object to be projected, such as a handwritten document or a printed matter, and this object to be projected 22 is fixed on a mounting table 23. As shown in FIG. An objective lens 24 is disposed above the object 22 to be projected.
.. A tunable wavelength filter 30, a liquid crystal spatial light modulator 40 as an optically addressed spatial light modulator, and a tunable wavelength filter 5
0 is provided sequentially. The variable wavelength filter 30.
50 are so-called color filters, and liquid crystal cells 34 and 54 each have a refractive index that changes depending on the applied voltage from the corresponding power source (not shown).

この液晶セル34.54の入出力側に設けられた偏光子
36と38.56と58とからなり、印加電圧の切り換
えで透過波長域が切り換えられるように(例えば印加電
圧を短いタイミング(例えば0.1m5ec)で3段階
に切り換えて透過光がR(赤)、G(緑)、B(青)と
なるように)構成されている。前記液晶空間光変調器4
0は、アドレス部としての光導電体層(例えばアモルフ
ァスシリコン層)42と、光変調部としての液晶層44
と1両者の境界面に設けられた誘電体ミラー46と、前
記光導電体層42と液晶層44の間に所定の電圧を印加
する電源(図示省略)とからなっている。60はハロゲ
ンランプのような白色光源からなる投影用光源である。
This liquid crystal cell consists of polarizers 36, 38, 56, and 58 provided on the input and output sides of the liquid crystal cell 34, 54. .1m5ec), the transmitted light is switched in three stages to R (red), G (green), and B (blue). The liquid crystal spatial light modulator 4
0 includes a photoconductor layer (for example, an amorphous silicon layer) 42 as an address section and a liquid crystal layer 44 as a light modulation section.
and 1, a dielectric mirror 46 provided at the interface between the photoconductor layer 42 and the liquid crystal layer 44, and a power source (not shown) for applying a predetermined voltage between the photoconductor layer 42 and the liquid crystal layer 44. A projection light source 60 is a white light source such as a halogen lamp.

70は読出し投影用光学系で、この読出し投影用光学系
70は、前記投影用光源60からの光を反射し前記液晶
空間光変調器40の液晶層44に向かって照射するミラ
ー72と。
Reference numeral 70 denotes a readout projection optical system, and the readout projection optical system 70 includes a mirror 72 that reflects the light from the projection light source 60 and irradiates it toward the liquid crystal layer 44 of the liquid crystal spatial light modulator 40 .

このミラー72で反射した光を直線偏光にし、前記波長
可変フィルタ50を介して読み出し光として前記液晶層
44に照射せしめる偏光ビームスプリッタ−74と、前
記液晶層44から読み出され前記偏光ビームスプリッタ
−74で反射した光を投影像表示部としてのスクリーン
75に拡大投影する投影レンズ76とからなっている。
A polarizing beam splitter 74 converts the light reflected by the mirror 72 into linearly polarized light and irradiates it to the liquid crystal layer 44 as read light via the variable wavelength filter 50; It consists of a projection lens 76 that enlarges and projects the light reflected by 74 onto a screen 75 serving as a projection image display section.

80は前記投影用光源60の光の一部を前記被投影体2
2に照射する照明用光学系で、この照明用光学系80は
、前記ミラー72で反射し前記偏光ビームスプリッタ−
74で反射した通常使用しない光82を反射して、前記
被投影体22に照射せしめるミラー84を主体に構成さ
れている。9゜は前記液晶空間光変調器40の液晶層4
4から読み出された光の一部をモニタ像表示部としての
モニタ用ガラス板92上に投影するモニタ用光学系で、
このモニタ用光学系90は、前記液晶層44から読み出
され前記波長可変フィルタ50を介して前記偏光ビーム
スプリッタ−74へ向かう光の一部を反射するハーフミ
ラ−94と、このハーフミラ−94で反射した光を前記
モニタ用ガラス板92上に投影するレンズ96とを主体
として構成されている。
80 directs a part of the light from the projection light source 60 to the object 2 to be projected.
This illumination optical system 80 is an optical system for illumination that irradiates light onto the polarizing beam splitter.
It is mainly composed of a mirror 84 that reflects the unused light 82 reflected by the projector 74 and irradiates it onto the object 22 to be projected. 9° is the liquid crystal layer 4 of the liquid crystal spatial light modulator 40
A monitor optical system that projects a part of the light read out from 4 onto a monitor glass plate 92 serving as a monitor image display section,
This monitoring optical system 90 includes a half mirror 94 that reflects a part of the light that is read out from the liquid crystal layer 44 and goes to the polarizing beam splitter 74 via the variable wavelength filter 50; The main component is a lens 96 that projects the light onto the monitor glass plate 92.

つぎに前記実施例の作用について説明する。Next, the operation of the above embodiment will be explained.

照明用光学系80は、ミラー84によって、投影用光源
60からミラー72および偏光ビームスプリッタ−74
で反射した通常使用しない光82を反射して、被投影体
22に照射する。そして、被投影体22からの反射光が
、対物レンズ24および波長可変フィルタ30を介して
、書き込み光として液晶空間光変調器40の光導電体層
42に入力すると、光導電体層42のうちの光が当たっ
た部分のインピーダンスが低下し、投影画像に相当する
電圧が液晶層44に加わる。
The illumination optical system 80 connects the projection light source 60 to the mirror 72 and the polarizing beam splitter 74 by means of a mirror 84.
The reflected light 82, which is not normally used, is reflected and irradiated onto the object 22 to be projected. When the reflected light from the object 22 to be projected passes through the objective lens 24 and the variable wavelength filter 30 and enters the photoconductor layer 42 of the liquid crystal spatial light modulator 40 as writing light, one of the photoconductor layers 42 The impedance of the portion hit by the light decreases, and a voltage corresponding to the projected image is applied to the liquid crystal layer 44.

すなわち、液晶空間光変調器40の液晶層44の光学的
性質が変化する。このとき、カラー表示のために、周知
の技術的手段によって、波長可変フィルタ30の液晶セ
ル34には、その透過光がR(赤)、G(緑)、B(青
)となるように、対応する電源からの印加電圧が短いタ
イミング(例えば0.1m5ec)で3段階(例えば5
.10.15Vの3段階)に切り換えて供給され、この
切り換えタイミングに同期して、液晶空間光変調器40
の液晶層44への対応する電源からの印加電圧の切り換
えがなされる。このような液晶層44の光学的性質が変
化している状態において、読出し投影用光学系70はつ
ぎのように作用する。すなわち、投影用光源60からの
光は、ミラー72で反射して偏光ビームスプリッタ−7
4に入力し、この偏光ビームスプリッタ−74で直線偏
光した後。
That is, the optical properties of the liquid crystal layer 44 of the liquid crystal spatial light modulator 40 change. At this time, for color display, by well-known technical means, the liquid crystal cell 34 of the wavelength tunable filter 30 is configured such that the transmitted light becomes R (red), G (green), and B (blue). The voltage applied from the corresponding power supply is set in three stages (for example, 5
.. 10.15V in three stages), and in synchronization with this switching timing, the liquid crystal spatial light modulator 40
The voltage applied to the liquid crystal layer 44 from the corresponding power source is switched. In such a state where the optical properties of the liquid crystal layer 44 are changing, the reading projection optical system 70 operates as follows. That is, the light from the projection light source 60 is reflected by the mirror 72 and sent to the polarizing beam splitter 7.
4 and linearly polarized by this polarizing beam splitter 74.

ハーフミラ−94および波長可変フィルタ50を介して
液晶空間光変調器40の液晶層44に入力する。この入
射光は、液晶層44を通り誘電体ミラー46で反射して
再び液晶層44を通る間に、液晶層44の光学的性質の
変化に応じた位相変調(偏波面の変化)を受けて、液晶
層44からの読み出し光となる。この読み出し光は、波
長可変フィルタ50およびハーフミラ−94を通り、偏
光ビームスプリッタ−74で反射し、投影レンズ76を
通ることによってスクリーン75上に拡大投影される。
The light is input to the liquid crystal layer 44 of the liquid crystal spatial light modulator 40 via the half mirror 94 and the variable wavelength filter 50. This incident light passes through the liquid crystal layer 44, is reflected by the dielectric mirror 46, and while passing through the liquid crystal layer 44 again, it undergoes phase modulation (change in polarization plane) in accordance with changes in the optical properties of the liquid crystal layer 44. , becomes read light from the liquid crystal layer 44. This readout light passes through the variable wavelength filter 50 and the half mirror 94, is reflected by the polarizing beam splitter 74, and passes through the projection lens 76 to be enlarged and projected onto the screen 75.

このとき、カラー表示のために、周知の技術的手段によ
って、波長可変フィルタ30の液晶セル34への印加電
圧の切り換えタイミングおよび液晶空間光変調器40の
液晶層44への印加電圧の切り換えタイミングと同期す
るように、対応する電源から波長可変フィルタ50の液
晶セル54へ印加する電圧が切り換えて供給され。
At this time, for color display, the switching timing of the applied voltage to the liquid crystal cell 34 of the wavelength tunable filter 30 and the switching timing of the applied voltage to the liquid crystal layer 44 of the liquid crystal spatial light modulator 40 are controlled by well-known technical means. The voltage applied to the liquid crystal cell 54 of the wavelength tunable filter 50 is switched and supplied from the corresponding power source so as to be synchronized.

その透過光が順次R(赤)、G(緑)、B(青)と切り
換えられる。そして、液晶空間光変調器40として20
mm X 20mmの大きさのものを用いて実験したと
ころ、空間解像度が70 (lp/am)の2800 
x 2800画素が得られ、通常の文書の投影に十分対
応できた。また、波長可変フィルタ30.50の液晶セ
ル34.54および液晶空間光変調器40の液晶層とし
て強誘電性液晶を用いた場合には、液晶セル34.54
への印加電圧の切り換えタイミングを短く(例えば0,
1m5ec)することができ、カラー表示のための波長
可変フィルタ30.50の切り換えを支障なく実行でき
る。
The transmitted light is sequentially switched to R (red), G (green), and B (blue). 20 as the liquid crystal spatial light modulator 40.
When we conducted an experiment using a device with a size of mm
x 2800 pixels was obtained, which was sufficient for projection of ordinary documents. Furthermore, when ferroelectric liquid crystal is used as the liquid crystal cell 34.54 of the wavelength tunable filter 30.50 and the liquid crystal layer of the liquid crystal spatial light modulator 40, the liquid crystal cell 34.54
Shorten the switching timing of the applied voltage to (for example, 0,
1 m5ec), and switching of the wavelength tunable filter 30.50 for color display can be performed without any problem.

また、液晶層44から読み出された光の一部は、モニタ
用光学系90によってモニタ用ガラス板92上に投影さ
れる。すなわち、液晶層44から読み出され波長可変フ
ィルタ50を介して偏光ビームスプリッタ−74へ向か
う光の一部′がハーフミラ−94で反射され、この反射
光はレンズ96を通ることによってモニタ用ガラス板9
2上に投影される。
Further, a part of the light read out from the liquid crystal layer 44 is projected onto a monitor glass plate 92 by a monitor optical system 90. That is, a portion of the light read out from the liquid crystal layer 44 and directed to the polarizing beam splitter 74 via the wavelength tunable filter 50 is reflected by the half mirror 94, and this reflected light passes through the lens 96 to the monitor glass plate. 9
It is projected onto 2.

ピント調節は次のようにして行なわれる。まず被投影体
22および対物レンズ24の位置を調節することによっ
て、モニタ用ガラス板92上のカラー表示の投影像のピ
ントを合わせ、ついで投影レンズ76の位置を調節する
ことによって、スクリーン75上のカラー表示の拡大投
影像のピントを合わせる。
Focus adjustment is performed as follows. First, by adjusting the positions of the projection object 22 and the objective lens 24, the projected image of the color display on the monitor glass plate 92 is focused, and then by adjusting the position of the projection lens 76, the image on the screen 75 is focused. Adjust the focus of the enlarged projected color display image.

前記実施例では、光アドレス型空間光変調器は、光導電
体層と液晶層と誘電体ミラーと電源とからなる液晶空間
光変調器としたが、本発明はこれに限られるものではな
く、被投影体からの光をアドレス部に書き込むことによ
って、光変調部の光学的性質が変化するものであればよ
い0例えば、光電面とMCP(マイクロチャンネルプレ
ート)をアドレス部とし、シュリーレン光学系で読み出
すことのできる膜(例えばニトロセルロース)を光変調
部としたもの、または光導電体層をアドレス部とし、電
気光学結晶層を光変調部とし、この光導電体層と電気光
学結晶層をサンドインチ構造としたものであってもよい
In the above embodiment, the optically addressed spatial light modulator is a liquid crystal spatial light modulator consisting of a photoconductor layer, a liquid crystal layer, a dielectric mirror, and a power source, but the present invention is not limited to this. Any device that changes the optical properties of the light modulation section by writing light from the object to be projected into the address section is sufficient.For example, a photocathode and an MCP (microchannel plate) are used as the address section, and a schlieren optical system is used. A readable film (for example, nitrocellulose) is used as the light modulating part, or a photoconductor layer is used as the address part and an electro-optic crystal layer is used as the light modulating part, and the photoconductor layer and the electro-optic crystal layer are sandwiched together. It may also have an inch structure.

前記実施例では、波長可変フィルタは、液晶セルを主体
として構成したが、本発明はこれに限られるものではな
く、電気光学結晶や音響光学結晶を主体として構成する
ようにしてもよい。
In the embodiments described above, the wavelength tunable filter is mainly composed of a liquid crystal cell, but the present invention is not limited thereto, and may be composed mainly of an electro-optic crystal or an acousto-optic crystal.

前記実施例では、カラー表示の投影像が得られるように
、被投影体からの光が光アドレス型空間光変調器のアド
レス部に至る光路中と、投影用光源からの光が光アドレ
ス型空間光変調器の光変調部を介して投影像表示部に至
る光路中とのそれぞれに波長可変フィルタを挿入するよ
うに構成したが、カラー表示の投影像が必要ないときは
、これらの波長可変フィルタを省略することができる。
In the above embodiment, in order to obtain a projected image in color display, the light from the object to be projected is in the optical path leading to the address section of the optically addressable spatial light modulator, and the light from the projection light source is in the optically addressed spatial light modulator. The configuration is such that variable wavelength filters are inserted in each of the optical paths leading to the projection image display section via the light modulation section of the light modulator, but when a color display projection image is not required, these wavelength variable filters can be inserted. can be omitted.

前記実施例では、投影用光源の光の一部を被投影体に照
射する照明用光学系を設けて、被投影体に光を照射する
照明装置を省略できるようにしたが、本発明はこれに限
られるものではなく、例えば、投影用光源とは別に被投
影体に光を照射する照明装置を設けるようにしたものに
ついても利用することができる。
In the embodiment described above, an illumination optical system is provided to irradiate a part of the light from the projection light source onto the object to be projected, so that the illumination device for irradiating light to the object to be projected can be omitted. However, the present invention is not limited to this, and for example, it is also possible to use a device that is provided with an illumination device that irradiates light onto the object to be projected, in addition to the projection light source.

前記実施例では、光アドレス型空間光変調器の光変調部
から読み出した光の一部をモニタ像表示部に導くモニタ
用光学系を設けて、投影像のピント合わせが容易になる
ように構成したが1本発明はこれに限られるものではな
く、モニタ用光学系を省略したものについても利用する
ことができる。
In the embodiment described above, a monitoring optical system is provided to guide a part of the light read out from the light modulation section of the optically addressed spatial light modulator to the monitor image display section, so that the projection image can be easily focused. However, the present invention is not limited to this, and can also be used without the monitoring optical system.

「発明の効果」 本発明による投影装置は、上記のように、手書き文書や
印刷物などの被投影体からの光(例えば反射光)が書き
込み光としてアドレス部に入力すると光変調部の光学的
性質が変化する光アドレス型空間光変調器と、投影用光
源からの光を光アドレス型空間光変調器の光変調部に照
射し光変調部からの読み出した光を投影像表示部に投影
する読出し投影用光学系とを具備しているので、簡単な
構成で1手書き文書や印刷物のような不透過型の媒体も
被投影体に利用することができ、用途範囲を広くするこ
とができる。また、被投影体からの光がアドレス部に至
る光路中と、投影用光源からの光が光変調部を介して投
影像表示部に至る光路中とに波長可変フィルタを挿入し
た場合には、カラー表示が可能になる。また、投影用光
源の光の一部を被投影体に照射する照明用光学系を設け
た場合には、被投影体への照明用光源を別に設けなくて
もよい、また、光アドレス型空間光変調器の光変調部か
ら読み出した光の一部をモニタ像表示部に導くモニタ用
光学系を設けた場合には、光、アドレス型空間光変調器
への書き込み光と光アドレス型空間光変調器からの読み
出し光のフォーカス調節を容易にすることができる。
"Effects of the Invention" As described above, in the projection device according to the present invention, when light (e.g. reflected light) from an object to be projected such as a handwritten document or a printed matter is input to the address section as writing light, the optical property of the light modulating section is An optically addressed spatial light modulator in which the projection light changes, and a readout system in which light from a projection light source is irradiated onto a light modulation section of the optically addressed spatial light modulator and the light read out from the light modulation section is projected onto a projection image display section. Since the projector is equipped with a projection optical system, even non-transparent media such as handwritten documents and printed matter can be used as projection objects with a simple configuration, and the range of applications can be widened. In addition, when a variable wavelength filter is inserted in the optical path of the light from the object to be projected to the address section and the optical path of the light from the projection light source to the projection image display section via the light modulation section, Color display becomes possible. In addition, if an illumination optical system is provided that irradiates a part of the light from the projection light source onto the object to be projected, there is no need to separately provide a light source for illuminating the object to be projected, and it is also possible to use an optically addressed space. If a monitoring optical system is provided that guides a portion of the light read out from the light modulation part of the light modulator to the monitor image display part, the light, the writing light to the addressing spatial light modulator, and the optical addressing spatial light Focus adjustment of readout light from the modulator can be facilitated.

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

第1図は本発明による投影装置の一実施例を示す構成図
、第2図は従来例を示す構成図である。 22・・・被投影体、30.50・・・波長可変フィル
タ、40・・・液晶空間光変調器(光アドレス型空間光
変調器ン、42・・・光導電体層(アドレス部)、44
・・・液晶層(光変調部)、46・・・誘電体ミラー、
60・・・投影用光源、70・・読出し投影用光学系、
75・・・スクリーン(投影像表示部)、80・・・照
明用光学系、90・・・モニタ用光学系。
FIG. 1 is a block diagram showing an embodiment of a projection apparatus according to the present invention, and FIG. 2 is a block diagram showing a conventional example. 22... Projection object, 30.50... Tunable wavelength filter, 40... Liquid crystal spatial light modulator (optical addressing type spatial light modulator), 42... Photoconductor layer (address section), 44
...Liquid crystal layer (light modulation section), 46...dielectric mirror,
60... Light source for projection, 70... Optical system for readout projection,
75...Screen (projection image display unit), 80...Illumination optical system, 90...Monitoring optical system.

Claims (4)

【特許請求の範囲】[Claims] (1)被投影体からの光により光変調部の光学的性質が
変化する光アドレス型空間光変調器と、投影用光源から
の光を前記光アドレス型空間光変調器の光変調部に照射
することによって、前記光学的性質の変化を読み出す読
出し投影用光学系とを具備してなることを特徴とする投
影装置。
(1) An optically addressed spatial light modulator in which the optical properties of a light modulating section are changed by light from a projection target, and light from a projection light source is irradiated onto the light modulating section of the optically addressing spatial light modulator. A projection apparatus comprising: a readout projection optical system for reading out changes in the optical properties.
(2)被投影体からの光が光アドレス型空間光変調器の
アドレス部に至る光路中と、投影用光源からの光が光ア
ドレス型空間光変調器の光変調部を介して投影像表示部
に至る光路中とのそれぞれに、印加電圧の切り換えで透
過波長域が切り換えられる波長可変フィルタを挿入して
なる請求項(1)記載の投影装置。
(2) A projected image is displayed in the optical path in which the light from the object to be projected reaches the address section of the optically addressed spatial light modulator, and the light from the projection light source passes through the light modulating section of the optically addressed spatial light modulator. 2. The projection apparatus according to claim 1, further comprising a variable wavelength filter whose transmission wavelength range can be changed by changing an applied voltage, in each of the optical paths leading to the part.
(3)投影用光源の光の一部を被投影体に照射する照明
用光学系を設けてなる請求項(1)または(2)記載の
投影装置。
(3) The projection apparatus according to claim (1) or (2), further comprising an illumination optical system that irradiates a part of the light from the projection light source onto the object to be projected.
(4)光アドレス型空間光変調器の光変調部から読み出
した光の一部をモニタ像表示部に導くモニタ用光学系を
設けてなる請求項(1)(2)または(3)記載の投影
装置。
(4) The method according to claim (1), (2) or (3), further comprising a monitoring optical system that guides a part of the light read out from the light modulation section of the optically addressed spatial light modulator to a monitor image display section. Projection device.
JP2044009A 1990-02-23 1990-02-23 Projection device Expired - Fee Related JP2983030B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2044009A JP2983030B2 (en) 1990-02-23 1990-02-23 Projection device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2044009A JP2983030B2 (en) 1990-02-23 1990-02-23 Projection device

Publications (2)

Publication Number Publication Date
JPH03246531A true JPH03246531A (en) 1991-11-01
JP2983030B2 JP2983030B2 (en) 1999-11-29

Family

ID=12679697

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2044009A Expired - Fee Related JP2983030B2 (en) 1990-02-23 1990-02-23 Projection device

Country Status (1)

Country Link
JP (1) JP2983030B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06118377A (en) * 1992-10-01 1994-04-28 Mitsubishi Electric Corp Video camera device and projection type display device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06118377A (en) * 1992-10-01 1994-04-28 Mitsubishi Electric Corp Video camera device and projection type display device

Also Published As

Publication number Publication date
JP2983030B2 (en) 1999-11-29

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