JPH07109443B2 - Dichroic prism and projection color display - Google Patents
Dichroic prism and projection color displayInfo
- Publication number
- JPH07109443B2 JPH07109443B2 JP62316710A JP31671087A JPH07109443B2 JP H07109443 B2 JPH07109443 B2 JP H07109443B2 JP 62316710 A JP62316710 A JP 62316710A JP 31671087 A JP31671087 A JP 31671087A JP H07109443 B2 JPH07109443 B2 JP H07109443B2
- Authority
- JP
- Japan
- Prior art keywords
- selective reflection
- reflection layer
- wavelength selective
- prism
- angle
- 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.)
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Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、可視光の色分離や色合成を行なうダイクロイ
ックプリズム及びそれを用いた投写型カラー表示装置に
関する。Description: TECHNICAL FIELD The present invention relates to a dichroic prism that performs color separation and color synthesis of visible light, and a projection type color display device using the dichroic prism.
従来のダイクロイックプリズムは、第４図のように直角
を挟む２つの面にそれぞれ第１の波長選択反射層と第２
の波長選択反射層を持つ直角プリズムを４個貼り合わせ
たものや、第５図のように直角を挟む２つの面のうち１
つの面に第１の波長選択反射層を持つ直角プリズム２個
と、同様に第２の波長選択反射層を持つ直角プリズム２
個を交互になるように貼り合わせたものがあった。A conventional dichroic prism has a first wavelength selective reflection layer and a second wavelength selection reflection layer on two surfaces sandwiching a right angle as shown in FIG.
With four right-angle prisms with a wavelength-selective reflection layer, or one of the two surfaces sandwiching a right angle as shown in FIG.
Two right-angle prisms each having a first wavelength-selective reflective layer on one surface, and two right-angle prisms 2 each having a second wavelength-selective reflective layer
There was a piece that was laminated in an alternating manner.
しかし、前述の技術では、前者は波長選択反射層を形成
する蒸着面が８面であり、製造コストが高くつく。また
後者では、ダイクロイックプリズムに入射した光が波長
選択反射層で直接反射する光と、貼り合わせに用いる接
着剤を通過してから波長選択反射層で反射する光とがあ
り、屈折率のちがいから、色が変わったり、投写光学系
の場合にはレンズを用いるのでピントのズレや重なりが
生じる。However, in the above technique, the former has eight vapor deposition surfaces for forming the wavelength selective reflection layer, and thus the manufacturing cost is high. In the latter, there are light that is incident on the dichroic prism that is directly reflected by the wavelength selective reflection layer and light that is transmitted through the adhesive used for bonding and then reflected by the wavelength selective reflection layer, and therefore has a different refractive index. , The color is changed, and in the case of the projection optical system, the lens is used, so that the focus is shifted or overlapped.
そこで本発明は、このような問題点を解決するもので、
その目的とするところは、波長選択反射層は４面で、コ
ストを低くし、かつダイクロイックプリズムに入射した
光を波長選択反射層で直接反射させ、変色やピントのズ
レの生じない、色分離及び色合成のためのダイクロイッ
クプリズムを提供するところにある。Therefore, the present invention solves such a problem,
The purpose of this is that the wavelength selective reflection layer has four surfaces, the cost is low, and the light incident on the dichroic prism is directly reflected by the wavelength selective reflection layer, so that discoloration or out-of-focus shift does not occur. It provides a dichroic prism for color synthesis.
〔問題点を解決するための手段〕 本発明は、第１に、４個の直角プリズムの直角を挟む面
をそれぞれ接着剤により貼り合わせて波長選択反射層が
略十字状になるように構成されるダイクロイックプリズ
ムにおいて、 第１の前記直角プリズムの直角を挟む２つの面には、そ
れぞれ第１の波長選択反射層と第２の波長選択反射層を
形成し、 第２の前記直角プリズムの直角を挟む２つの面は、一方
の面には第１の波長選択反射層を形成し、他方の面には
波長選択反射層は形成せず、 第３の前記直角プリズムの直角を挟む２つの面は、一方
の面には第２の波長選択反射層を形成し、他方の面には
波長選択反射層は形成せず、 第４の前記直角プリズムの直角を挟む２つの面には、波
長選択反射層を形成せず、 前記４個の直角プリズムの直角を挟む面の隣接する２つ
の直角プリズムは、前記第１の波長選択反射層と前記第
２の波長選択反射層が直交するように、前記波長選択反
射層の形成される面と、前記波長選択反射層の形成され
ない面とを前記接着剤により貼り合わせてなる ことを特徴とする。[Means for Solving the Problems] First, the present invention is configured such that the surfaces of the four right-angle prisms that sandwich the right angle are bonded together with an adhesive so that the wavelength selective reflection layer has a substantially cross shape. In the dichroic prism according to the present invention, a first wavelength selective reflection layer and a second wavelength selective reflection layer are respectively formed on the two surfaces sandwiching the right angle of the first right angle prism, and the right angle of the second right angle prism is formed. The two sandwiched surfaces have the first wavelength selective reflection layer formed on one surface and the wavelength selective reflection layer not formed on the other surface, and the two surfaces sandwiching the right angle of the third rectangular prism are , The second wavelength selective reflection layer is formed on one surface and the wavelength selective reflection layer is not formed on the other surface, and the wavelength selective reflection is formed on the two surfaces sandwiching the right angle of the fourth rectangular prism. Surfaces that sandwich the right angles of the four right-angle prisms without forming layers In the two adjacent right-angle prisms, the surface on which the wavelength selective reflection layer is formed and the formation of the wavelength selective reflection layer are formed so that the first wavelength selective reflection layer and the second wavelength selective reflection layer are orthogonal to each other. It is characterized in that it is bonded to the surface which is not covered by the adhesive.
第２に、複数の色光をそれぞれ変調する複数の液晶ライ
トバルブと、該複数の液晶ライトバルブにより変調され
た色光を合成するダイクロイックプリズムと、該ダイク
ロイックプリズムにより合成された光を投写する投写レ
ンズとを備える投写型カラー表示装置において、 前記ダイクロイックプリズムに上記第１の特徴となるダ
イクロイックプリズムを用い、第２の直角プリズム、第
３の直角プリズム及び第４の直角プリズムに、前記複数
の液晶ライトバルブからの色光を入射し、第１の直角プ
リズムより合成光を前記投写レンズに出射する ことを特徴とする。Secondly, a plurality of liquid crystal light valves that respectively modulate a plurality of color lights, a dichroic prism that combines the color lights modulated by the plurality of liquid crystal light valves, and a projection lens that projects the light combined by the dichroic prisms. In a projection color display device including: a dichroic prism, the dichroic prism having the first characteristic is used, and the second right-angle prism, the third right-angle prism, and the fourth right-angle prism are provided with the plurality of liquid crystal light valves. From the first right angle prism and emits combined light to the projection lens.
本発明の上記の構成によれば、製造コストを大幅に引き
下げるとともに、ダイクロイックプリズムの性能を充分
高めることが可能となる。According to the above configuration of the present invention, it is possible to significantly reduce the manufacturing cost and sufficiently improve the performance of the dichroic prism.
以下本発明による一実施例を図面に従って説明する。 An embodiment according to the present invention will be described below with reference to the drawings.
第１図は、本発明はダイクロイックプリズムの構成を示
す斜視図である。第１の直角プリズム１の直角を挟む２
つの面には、それぞれ第１の波長選択反射層５と第２の
波長選択反射層６が蒸着あるいはスパッタ等により形成
されている。波長選択反射層は、誘電体多層膜で形成さ
れ、TiO2及びSiO2薄膜を数十層交互に積層することで波
長選択反射層特性を得ている。その他MgF2やZROによっ
ても同様である。第２図は、波長選択反射特性の一例
で、点線が第１の波長選択反射層５の特性で、実線が第
２の波長選択反射層６の特性である。第１の波長選択反
射層５は、透過率50％の位置がおおむね590〔nm）付近
で赤色光を反射する。第２の波長選択反射層６は透過率
50％の位置がおおむね500〔nm〕付近で青色光を反射す
る。残る緑色光（おおむね500〔nm〕から590〔nm〕の間
の光）は透過するため、光の三原色への色分離及び色合
成に用いられる。尚、波長選択特性は蒸着時の設定を変
えることにより、さまざまな色分離、色合成が可能とな
る。FIG. 1 is a perspective view showing the structure of a dichroic prism according to the present invention. 2 which sandwiches the right angle of the first right angle prism 1
A first wavelength selective reflection layer 5 and a second wavelength selective reflection layer 6 are formed on each of the two surfaces by vapor deposition or sputtering. The wavelength selective reflection layer is formed of a dielectric multilayer film, and the wavelength selective reflection layer characteristics are obtained by alternately laminating several tens of TiO 2 and SiO 2 thin films. The same applies to MgF 2 and Z R O. FIG. 2 shows an example of the wavelength selective reflection characteristics. The dotted line shows the characteristic of the first wavelength selective reflection layer 5, and the solid line shows the characteristic of the second wavelength selective reflection layer 6. The first wavelength selective reflection layer 5 reflects red light at a position where the transmittance is 50% is approximately 590 [nm]. The second wavelength selective reflection layer 6 has a transmittance
The 50% position reflects blue light at around 500 [nm]. The remaining green light (generally between 500 [nm] and 590 [nm]) is transmitted, and is used for color separation into the three primary colors and color synthesis. Incidentally, the wavelength selection characteristics can be subjected to various color separation and color combination by changing the setting at the time of vapor deposition.
第２の直角プリズム２の直角を挟む２つの面のうち、１
つの面に第１の波長選択反射層５が、また第３の直角プ
リズム３の直角を挟む２つの面のうち、１つの面に第２
の波長選択反射層６が、それぞれ蒸着等により第１の直
角プリズム１同様に形成されている。第４の直角プリズ
ム４の直角を挟む２つの面には何も波長選択反射特性は
持たしてない。Of the two surfaces that sandwich the right angle of the second right angle prism 2, 1
The first wavelength selective reflection layer 5 is provided on one surface, and the second wavelength selective reflection layer 5 is provided on one of the two surfaces sandwiching the right angle of the third rectangular prism 3.
The wavelength selective reflection layer 6 is formed in the same manner as the first rectangular prism 1 by vapor deposition or the like. The two surfaces that sandwich the right angle of the fourth rectangular prism 4 do not have any wavelength selective reflection characteristic.
これらの直角プリズム４個を第１図に示すような方向で
貼り合わせ、波長選択反射層が直交するようにする。貼
り合わせには、エポキシ系の熱硬化型やUV硬化型の光学
接着剤等を用い、光学的に貼り合わせる。光学接着剤は
屈折率がプリズムの屈折率と同じであればよいが、全く
同じものはないために、第５図のように構成されたダイ
クロイックプリズムでは、接着剤の層を通過せずに反射
する光と、接着剤の層を通過してから反射する光とがあ
り、そこで色の違いが生じてしまう。また、光路長が異
なるためにレンズを用いる投写光学系においてピントの
ズレ等が生じてしまう。しかし、第１図のような構成で
あれば、どのような入射光も、接着剤の層を通過せずに
反射するか、接着剤の層を通過してから反射するかのど
ちらか一方のみとなり、前述のような問題点は全く生じ
なくなる。また、直角に対する斜面にそれぞれARコート
をすることによって透過率の高い、明るいものが作成で
きる。These four rectangular prisms are bonded together in the direction shown in FIG. 1 so that the wavelength selective reflection layers are orthogonal to each other. For bonding, an epoxy-based thermosetting or UV-curing type optical adhesive or the like is used to optically bond. The refractive index of the optical adhesive may be the same as that of the prism, but since the refractive index is not the same, the dichroic prism configured as shown in FIG. 5 reflects without passing through the adhesive layer. There is light that is emitted and light that is reflected after passing through the adhesive layer, which causes a color difference. In addition, since the optical path lengths are different, in a projection optical system using a lens, a focus shift or the like occurs. However, with the configuration shown in FIG. 1, any incident light is either reflected without passing through the adhesive layer or reflected after passing through the adhesive layer. Therefore, the above-mentioned problems do not occur at all. In addition, bright coatings with high transmittance can be created by applying AR coating to the slopes at right angles.
第３図は、本発明のダイクロイックプリズムを色合成に
用いた一実施例で、投写型カラー表示装置の構成図であ
る。FIG. 3 is a block diagram of a projection type color display device, which is an embodiment in which the dichroic prism of the present invention is used for color combination.
ハロゲンランプ等の白色光の投写光源７から出射する光
束をリフレクタ８及び集光レンズ９により集光し、熱線
カットフィルター10により赤外域の熱線をカットし、可
視光のみが色分離系に入射する。集光系には楕円リフレ
クタやパラボラリフレクタを用いて集光してもかまわな
い。A light beam emitted from a white light projection light source 7 such as a halogen lamp is condensed by a reflector 8 and a condenser lens 9, a heat ray cut filter 10 cuts heat rays in an infrared region, and only visible light enters a color separation system. . An elliptical reflector or a parabolic reflector may be used for the light collecting system.
色分離系においては、青色反射ダイクロイックミラー11
により青色光（おおむね500〔nm〕以下の波長成分）を
反射し、次に緑色反射ダイクロイックミラー12で緑色光
（おおむね500〔nm〕から590〔nm〕の波長成分）を反射
し、透過光から赤色光（おおむね590〔nm〕以上の波長
成分）として色分離を行なう。その後反射ミラー13で方
向を変え、それぞれの色の画像変調用の液晶ライトバル
ブに入射する。In the color separation system, a blue reflection dichroic mirror 11
Reflects the blue light (wavelength component of about 500 [nm] or less), and then reflects the green light (wavelength component of about 500 [nm] to 590 [nm]) by the green reflection dichroic mirror 12 from the transmitted light. Color separation is performed as red light (wavelength component of approximately 590 [nm] or more). After that, the direction is changed by the reflection mirror 13, and the light enters the liquid crystal light valve for image modulation of each color.
各色変調液晶ライトバルブ14R、14G、14Bには各色用の
信号電圧が印加され、電圧の大きさによって各色ごとに
画像を形成する。この液晶ライトバルブは、入射光の透
過率の制御を行なうシャッターの機能を果たすため、ア
クティブマトリスク液晶パネルや時分割駆動液晶パネル
のみならず、信号電圧に応じ透過率を可変する液晶パネ
ルであればよい。さらには、機械式、、電磁式等により
透過率の制御可能なバルブで置き換えることも可能であ
る。A signal voltage for each color is applied to each color modulation liquid crystal light valve 14R, 14G, 14B, and an image is formed for each color depending on the magnitude of the voltage. This liquid crystal light valve functions as a shutter that controls the transmittance of incident light. Good. Further, it is possible to replace with a valve whose transmittance can be controlled by a mechanical type, an electromagnetic type, or the like.
各色変調液晶ライトバルブ14R、14G、14Bで変調された
各色光は、第２図の分光特性を持つダイクロイックプリ
ズムに入射する。The respective color lights modulated by the respective color modulation liquid crystal light valves 14R, 14G and 14B enter the dichroic prism having the spectral characteristic shown in FIG.
赤色光は、第２の直角プリズム２の第４の直角プリズム
４の間と、第１の直角プリズム１の第３の直角プリズム
３の間に接着剤の層に達することなく第１の波長選択反
射層５により反射する。同様に青色光も接着剤の層に達
することなく第２の波長選択反射層６により反射する。
緑色光は、透過し、光は三原色によるカラー画像が形成
され、投写レンズ15によりスクリーン上に拡大投写され
る。スクリーン上では、三色の画像がそれぞれに左右あ
るいは上下に色の違いが認められず、ピントのズレのな
いシャープな画像となり、高画質の画像表示が行なわれ
る。The red light is emitted between the fourth right-angle prism 4 of the second right-angle prism 2 and the third right-angle prism 3 of the first right-angle prism 1 without reaching the layer of the adhesive, and the first wavelength-selective light is emitted. It is reflected by the reflective layer 5. Similarly, blue light is also reflected by the second wavelength selective reflection layer 6 without reaching the adhesive layer.
The green light is transmitted, and the light forms a color image of the three primary colors, which is enlarged and projected on the screen by the projection lens 15. On the screen, the three-color image has no difference in color between right and left or up and down, and becomes a sharp image with no focus shift, and high-quality image display is performed.
第４図及び第５図は従来のダイクロイックプリズムの構
成図で、第４図は、第１の直角プリズムを４個貼り合わ
せたもので、合計８面に蒸着をするため製造コストが高
くつく。第５図は第２の直角プリズム２と、第３の直角
プリズム３を２個づつ交互になるように貼り合わせたも
ので、前述の色の違いやピントのズレ等が生じる。4 and 5 are configuration diagrams of a conventional dichroic prism, and FIG. 4 is a diagram in which four first right-angle prisms are bonded together, and vapor deposition is performed on a total of eight surfaces, resulting in high manufacturing cost. FIG. 5 shows two second right-angle prisms 2 and third third right-angle prisms 3 which are bonded alternately so that the above-mentioned color difference and focus shift occur.
色分離、色合成を用いて行なうカラー画像表示装置であ
れば、本発明のダイクロイックプリズムは上記実施例以
外でも有効である。The dichroic prism of the present invention is also effective in any color image display device that uses color separation and color combination, other than the above embodiments.
以上述べたように本発明によれば、蒸着面が４面ですむ
ため非常に製造コストが安くなる上に、色の違いやピン
トのズレといった問題を解決し、色分離系では高性能な
色分離が可能となり、色合成系では、投写光学系におい
て高画質な画像表示を可能とするといった効果を有す
る。As described above, according to the present invention, since only four vapor deposition surfaces are required, the manufacturing cost is extremely low, and problems such as color difference and out of focus are solved, and a high-performance color separation system is used. Separation becomes possible, and the color synthesizing system has an effect of enabling high-quality image display in the projection optical system.
また本発明は、カラー表示装置の分野において優れた色
分離、色合成の特性を得られる点で特に有効である。Further, the present invention is particularly effective in the field of color display devices in that excellent color separation and color composition characteristics can be obtained.
第１図は本発明のダイクロイックプリズムの実施例を示
す斜視図である。 第２図は２つの波長選択反射層の分光特性図である。 第３図は本発明のダイクロイックプリズムを用いた一実
施例を示す構成図である。 第４図及び第５図は従来のダイクロイックプリズムの上
面から見た分解図である。 １……第１の直角プリズム ２……第２の直角プリズム ３……第３の直角プリズム ４……第４の直角プリズム ５……第１の波長選択反射層 ６……第２の波長選択反射層 ７……投写光源 11……青色反射ダイクロイックミラー 12……緑色反射ダイクロイックミラー 14R、14G、14B……各色変調液晶ライトバルブ 15……投写レンズFIG. 1 is a perspective view showing an embodiment of the dichroic prism of the present invention. FIG. 2 is a spectral characteristic diagram of two wavelength selective reflection layers. FIG. 3 is a configuration diagram showing an embodiment using the dichroic prism of the present invention. FIG. 4 and FIG. 5 are exploded views of the conventional dichroic prism seen from the upper surface. 1 ... 1st right-angled prism 2 ... 2nd right-angled prism 3 ... 3rd right-angled prism 4 ... 4th right-angled prism 5 ... 1st wavelength selection reflection layer 6 ... 2nd wavelength selection Reflective layer 7 …… Projection light source 11 …… Blue reflective dichroic mirror 12 …… Green reflective dichroic mirror 14R, 14G, 14B …… Each color modulation liquid crystal light valve 15 …… Projection lens
Claims (2)
ぞれ接着剤により貼り合わせて波長選択反射層が略十字
状になるように構成されるダイクロイックプリズムにお
いて、 第１の前記直角プリズムの直角を挟む２つの面には、そ
れぞれ第１の波長選択反射層と第２の波長選択反射層を
形成し、 第２の前記直角プリズムの直角を挟む２つの面は、一方
の面には第１の波長選択反射層を形成し、他方の面には
波長選択反射層は形成せず、 第３の前記直角プリズムの直角を挟む２つの面は、一方
の面には第２の波長選択反射層を形成し、他方の面には
波長選択反射層は形成せず、 第４の前記直角プリズムの直角を挟む２つの面には、波
長選択反射層を形成せず、 前記４個の直角プリズムの直角を挟む面に隣接する２つ
の直角プリズムは、前記第１の波長選択反射層と前記第
２の波長選択反射層が直交するように、前記波長選択反
射層の形成される面と、前記波長選択反射層の形成され
ない面とを前記接着剤により貼り合わせてなる ことを特徴とするダイクロイックプリズム。1. A dichroic prism configured such that the wavelength-selective reflection layers are formed in a substantially cross shape by bonding the surfaces sandwiching the right angles of four right-angle prisms to each other with an adhesive. A first wavelength selective reflection layer and a second wavelength selective reflection layer are respectively formed on the two surfaces sandwiching the first and second surfaces, and the two surfaces sandwiching the right angle of the second right-angled prism have a first surface on one surface. The wavelength selective reflection layer is formed on the other surface, and the wavelength selective reflection layer is not formed on the other surface. The two surfaces sandwiching the right angle of the third rectangular prism are the second wavelength selective reflection layer on one surface. And the wavelength selective reflection layer is not formed on the other surface, the wavelength selective reflection layer is not formed on the two surfaces sandwiching the right angle of the fourth rectangular prism, and The two right angle prisms adjacent to the surface sandwiching the right angle are The surface on which the wavelength selective reflection layer is formed and the surface on which the wavelength selective reflection layer is not formed are bonded by the adhesive so that the first wavelength selective reflection layer and the second wavelength selective reflection layer are orthogonal to each other. Is a dichroic prism.
ライトバルブと、該複数の液晶ライトバルブにより変調
された色光を合成するダイクロイックプリズムと、該ダ
イクロイックプリズムにより合成された光を投写する投
写レンズとを備える投写型カラー表示装置において、 前記ダイクロイックプリズムは、４個の直角プリズムの
直角を挟む面をそれぞれ接着剤により貼り合わせて波長
選択反射層が略十字状になるように構成され、 第１の前記直角プリズムの直角を挟む２つの面には、そ
れぞれ第１の波長選択反射層と第２の波長選択反射層を
形成し、 第２の前記直角プリズムの直角を挟む２つの面は、一方
の面には第１の波長選択反射層を形成し、他方の面には
波長選択反射層は形成せず、 第３の前記直角プリズムを直角を挟む２つの面は、一方
の面には第２の波長選択反射層を形成し、他方の面には
波長選択反射層は形成せず、 第４の前記直角プリズムの直角を挟む２つの面には、波
長選択反射層を形成せず、 前記４個の直角プリズムの直角を挟む面の隣接する２つ
の直角プリズムは、前記第１の波長選択反射層と前記第
２の波長選択反射層が直交するように、前記波長選択反
射層の形成される面と、前記波長選択反射層の形成され
ない面とを前記接着剤により貼り合わせてなり、 前記第２の直角プリズム、前記第３の直角プリズム及び
前記第４の直角プリズムに、前記複数の液晶ライトバル
ブからの色光を入射し、前記第１の直角プリズムより合
成光を前記投写レンズに出射する ことを特徴とする投写型カラー表示装置。2. A plurality of liquid crystal light valves for respectively modulating a plurality of color lights, a dichroic prism for combining the color lights modulated by the plurality of liquid crystal light valves, and a projection lens for projecting the light combined by the dichroic prisms. The dichroic prism is configured so that the surfaces sandwiching the right angles of the four right-angled prisms are bonded together with an adhesive so that the wavelength selective reflection layer has a substantially cross shape. A first wavelength selective reflection layer and a second wavelength selective reflection layer are respectively formed on the two surfaces of the right-angled prism that sandwich the right angle, and the two surfaces of the second right-angled prism that sandwich the right angle are The first wavelength-selective reflection layer is formed on the surface of No. 3, the wavelength-selective reflection layer is not formed on the other surface, and the two right angle prisms sandwiching the right angle prism are sandwiched between the two surfaces. The surface has the second wavelength selective reflection layer formed on one surface and the wavelength selective reflection layer not formed on the other surface, and the two surfaces sandwiching the right angle of the fourth rectangular prism have wavelengths. The two right-angle prisms adjacent to each other on the surfaces sandwiching the right angle of the four right-angle prisms without forming the selective reflection layer are arranged so that the first wavelength-selective reflection layer and the second wavelength-selective reflection layer are orthogonal to each other. A surface on which the wavelength selective reflection layer is formed and a surface on which the wavelength selective reflection layer is not formed are bonded together by the adhesive, and the second right-angle prism, the third right-angle prism, and the fourth right-angle prism The projection type color display device characterized in that the color light from the plurality of liquid crystal light valves is made incident on the right-angle prism and the combined light is emitted from the first right-angle prism to the projection lens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62316710A JPH07109443B2 (en) | 1987-12-15 | 1987-12-15 | Dichroic prism and projection color display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62316710A JPH07109443B2 (en) | 1987-12-15 | 1987-12-15 | Dichroic prism and projection color display |
Related Child Applications (4)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP08292964A Division JP3081800B2 (en) | 1996-11-05 | 1996-11-05 | Projection color display |
| JP08292967A Division JP3081801B2 (en) | 1996-11-05 | 1996-11-05 | Manufacturing method of dichroic prism |
| JP10216231A Division JP3131875B2 (en) | 1998-07-30 | 1998-07-30 | Dichroic prism and projection type color display device using the same |
| JP10216230A Division JP3131874B2 (en) | 1998-07-30 | 1998-07-30 | Dichroic prism and projection type color display device using the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01156701A JPH01156701A (en) | 1989-06-20 |
| JPH07109443B2 true JPH07109443B2 (en) | 1995-11-22 |
Family
ID=18080038
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62316710A Expired - Lifetime JPH07109443B2 (en) | 1987-12-15 | 1987-12-15 | Dichroic prism and projection color display |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07109443B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010250339A (en) * | 1999-02-04 | 2010-11-04 | Oerlikon Trading Ag Truebbach | Spectrally-selective beam splitter and recombining device and method for manufacturing the same |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6229651B1 (en) | 1996-11-01 | 2001-05-08 | Balzers Aktienresellschaft | Optical element and its manufacturing process |
| US6493159B1 (en) * | 1996-11-01 | 2002-12-10 | Unaxis Balzers Aktiengesellschaft | Optical element and its manufacturing process |
| US6101041A (en) * | 1997-05-13 | 2000-08-08 | Nikon Corporation | Cross dichroic prism, method of making the same, and full-color projector using the same |
-
1987
- 1987-12-15 JP JP62316710A patent/JPH07109443B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010250339A (en) * | 1999-02-04 | 2010-11-04 | Oerlikon Trading Ag Truebbach | Spectrally-selective beam splitter and recombining device and method for manufacturing the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01156701A (en) | 1989-06-20 |
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