JPH0452613A - Projection type lens - Google Patents
Projection type lensInfo
- Publication number
- JPH0452613A JPH0452613A JP2163335A JP16333590A JPH0452613A JP H0452613 A JPH0452613 A JP H0452613A JP 2163335 A JP2163335 A JP 2163335A JP 16333590 A JP16333590 A JP 16333590A JP H0452613 A JPH0452613 A JP H0452613A
- Authority
- JP
- Japan
- Prior art keywords
- green
- lens
- projection
- reflecting mirror
- optical system
- 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
Links
- 238000000295 emission spectrum Methods 0.000 claims abstract description 8
- 238000000151 deposition Methods 0.000 claims abstract description 3
- 230000003287 optical effect Effects 0.000 abstract description 11
- 238000007740 vapor deposition Methods 0.000 abstract description 4
- 230000005540 biological transmission Effects 0.000 abstract description 3
- 108010043121 Green Fluorescent Proteins Proteins 0.000 abstract 1
- 239000011521 glass Substances 0.000 description 9
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 7
- 230000000694 effects Effects 0.000 description 3
- 230000003595 spectral effect Effects 0.000 description 2
- 238000002834 transmittance Methods 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000001771 vacuum deposition Methods 0.000 description 1
Landscapes
- Lenses (AREA)
- Transforming Electric Information Into Light Information (AREA)
- Video Image Reproduction Devices For Color Tv Systems (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、投写型テレビ受像機に用いられる拡大投射用
レンズに関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an enlarged projection lens used in a projection type television receiver.
従来の技術
近年、小型ブラウン管の映像を、投写レンズを用いて、
スクリーン上に拡大投影し大画面を得る、いわゆる投写
型テレビが注目を集めている。Conventional technology In recent years, images from small cathode ray tubes have been transferred using projection lenses.
So-called projection televisions, which enlarge and project images onto a screen, are attracting attention.
投写型テレビに使用されているブラウン管の螢光体は、
高輝度、長寿命を実現する為に様々な改善が試みられて
きたが、その発光スペクトルは必ずしも理想的とはいえ
ない。特に、緑色の螢光体の発光スペクトルは、第３図
に示すように、緑色だけでなく青色や赤色の発行スペク
トルを含んでいる。The phosphor in the cathode ray tube used in projection televisions is
Various improvements have been attempted to achieve high brightness and long life, but the emission spectrum is not necessarily ideal. In particular, the emission spectrum of the green phosphor includes not only green emission spectra but also blue and red emission spectra, as shown in FIG.
このために、投写レンズは、波長の違いによるフォーカ
スのズレを改善する色消し効果をもつ構成にしたり、第
４図に示すように赤色成分をカットするためのコーティ
ング（透過型多層膜１９）をガラスレンズ１８の表面に
して、緑色の純度の改善をしてきた。第４図において、
１６は外鏡筒、１７は内鏡筒、２０はプラスチックレン
ズである。第３図に緑色の色純度を改善するための赤色
カットフィルター膜の特性１４を示す。To this end, the projection lens is constructed with an achromatic effect that improves the focus shift due to differences in wavelength, or is coated with a coating (transmissive multilayer film 19) to cut out the red component, as shown in Figure 4. The purity of green color has been improved on the surface of the glass lens 18. In Figure 4,
16 is an outer lens barrel, 17 is an inner lens barrel, and 20 is a plastic lens. FIG. 3 shows characteristics 14 of a red cut filter membrane for improving green color purity.
発明が解決しようとする課題
以上述べたような構成をもつ投写レンズにおいて、赤色
カットフィルターとして、多層干渉膜が用いられるがこ
のような多層膜はガラスレンズに真空蒸着によって構成
されるが、ガラスレンズの曲率によって均一な膜の形成
が難かしく、ガラスレンズが高価なことから、歩留まり
により、展着コストが高いものになるという問題があっ
た。Problems to be Solved by the Invention In the projection lens having the configuration described above, a multilayer interference film is used as a red cut filter.Such a multilayer film is formed by vacuum deposition on a glass lens. The curvature of the glass lens makes it difficult to form a uniform film, and the glass lens is expensive, so there is a problem in that the yield is high and the spreading cost becomes high.
本発明は上記問題点を解決するものであり、容易な構成
で色純度の高い緑色が得られる投射型レンズを得ること
を目的とする。The present invention is intended to solve the above-mentioned problems, and aims to provide a projection type lens that can provide a green color with high color purity with a simple configuration.
課題を解決するための手段
上記したような問題を解決する為に、本発明の投写光学
系は、緑色の投写レンズの光学系の一部に赤色カットフ
ィルターとして機能する反射鏡をもうけ、光学系をコン
パクトに構成するとともに、緑色の螢光体の発光スペク
トルに含まれる赤色成分を透過させ、緑色成分を反射す
る多層膜をこの反射鏡に形成することにより、色純度の
高い緑色が得られるようにしたものである。ここで、反
射鏡は平面であるため多層膜の形成が容易であり、蒸着
コストも安くなる。Means for Solving the Problems In order to solve the above-mentioned problems, the projection optical system of the present invention includes a reflecting mirror that functions as a red cut filter in a part of the optical system of the green projection lens, and the optical system In addition to having a compact structure, the reflector is coated with a multilayer film that transmits the red component included in the emission spectrum of the green phosphor and reflects the green component, making it possible to obtain a green color with high color purity. This is what I did. Here, since the reflecting mirror is flat, it is easy to form a multilayer film, and the deposition cost is also low.
作用
本発明は、投写レンズの光学系のコンパクト化と、緑色
の色純度の向上をはかるものである。従来例で示したよ
うに、これまでの光学系では、緑色の色純度の改善はガ
ラスレンズに、赤色成分を反射する多層膜を蒸着する口
止により行なわれていた。このため、ガラスレンズに多
層膜を形成する事が必要となり、コストも高いものにな
った。Effects The present invention aims to make the optical system of the projection lens more compact and to improve the color purity of green. As shown in the conventional example, in conventional optical systems, the color purity of green color has been improved by sealing the glass lens with a multilayer film that reflects the red component by vapor deposition. For this reason, it became necessary to form a multilayer film on the glass lens, which increased the cost.
本発明では、光学系をコンパクトにする為に、レンズを
保持する鏡筒の一部に反射鏡を保持する構成とし、この
反射鏡に、緑色の螢光体の発光スペクトルの赤色成分を
通過し、緑色成分を反射する多層膜を形成することによ
り、色純度の改善を図っている。In the present invention, in order to make the optical system compact, a reflecting mirror is held in a part of the lens barrel that holds the lens, and the red component of the emission spectrum of the green phosphor passes through this reflecting mirror. By forming a multilayer film that reflects green components, color purity is improved.
この様に、多層膜を平面に形成することにより、蒸着を
容易にし、コストを低減できる。また、透過型では透過
率が９５％程度なのに対し、反射型では９９％を達成で
き光のロスも少ない。By forming a multilayer film in a flat plane in this way, vapor deposition can be facilitated and costs can be reduced. Furthermore, while the transmissive type has a transmittance of about 95%, the reflective type can achieve a transmittance of 99%, resulting in less light loss.
実施例
以下本発明の実施例を図面を参照しながら説明する。第
１図は、本発明の一実施例を採用した投写レンズの軸方
向の断面図である。図面中において１は外鏡筒で、その
空洞には内鏡筒２が収納されている。内鏡筒２には投射
レンズ３．４が保持されている。また、外鏡筒１には反
射ミラー５が一体に保持されている。この投写レンズを
用いたコンパクトな光学系の全体構成の一例を第２図に
示す。外鏡筒ｌに保持されている反射ミラー５の表面に
は、第３図の緑色螢光体の分光特性１１の赤色成分１３
を通過し、緑色成分１２を反射する反射型多層膜１５が
形成されている。従って、第２図に示すような実施例に
おいて、スクリーン９に届く緑色には赤色成分がカット
され、緑の色純度が向上する。EXAMPLES Hereinafter, examples of the present invention will be described with reference to the drawings. FIG. 1 is an axial cross-sectional view of a projection lens employing an embodiment of the present invention. In the drawings, reference numeral 1 denotes an outer lens barrel, and an inner lens barrel 2 is housed in its cavity. A projection lens 3.4 is held in the inner barrel 2. Further, a reflecting mirror 5 is integrally held in the outer lens barrel 1. An example of the overall configuration of a compact optical system using this projection lens is shown in FIG. A red component 13 of the spectral characteristic 11 of the green phosphor shown in FIG.
A reflective multilayer film 15 is formed to reflect the green component 12. Therefore, in the embodiment shown in FIG. 2, the red component of the green color reaching the screen 9 is cut, and the color purity of the green color is improved.
発明の効果
本発明による緑色の色純度の向上は、第４図の従来例に
示すようにガラスレンズに、透過型の多層膜を形成する
ときに比べ、第１図の投写レンズに示したように反射ミ
ラーに、反射型の多層膜を形成するために、コストが安
くできる。すなわち、被蒸着物の形状が球面に比べ平面
である為に、均一な蒸着が容易であり、また被痕着物で
あるガラスレンズは高価な為、歩留りよにり反射ミラー
に膜形成する方が安価になる。Effects of the Invention The improvement in green color purity achieved by the present invention is as shown in the projection lens shown in Fig. 1, compared to when a transmission type multilayer film is formed on the glass lens as shown in the conventional example shown in Fig. 4. Since a reflective multilayer film is formed on the reflective mirror, the cost can be reduced. In other words, since the shape of the object to be deposited is flat compared to a spherical surface, it is easier to deposit uniformly, and since glass lenses, which are the object to be deposited, are expensive, it is better to form a film on a reflecting mirror in terms of yield. Becomes cheaper.
第３図に示したように、反射型多層膜１５は、緑色成分
Ｉ２を９９％以上反射して有効利用できるが、通過型多
層膜１４では９６％程度しか利用できない。As shown in FIG. 3, the reflective multilayer film 15 can effectively utilize more than 99% of the green component I2, while the transmission multilayer film 14 can only utilize about 96%.
従って、本発明は、緑色の螢光体の緑色成分を有効に利
用し、赤色成分をカットして緑色の色純度を安価に改善
することを可能にしている。Therefore, the present invention makes it possible to improve the color purity of green at a low cost by effectively utilizing the green component of the green phosphor and cutting the red component.
第１図は、本発明の反射型多層膜を形成した反射ミラー
を外鏡筒の一部に取り付けた投射レンズの断面図、第２
図は、第１図の投写レンズを使用した投写型ＴＶの光学
系の断面図、第３図は、緑色螢光体の発光分布と、赤色
成分をカントするための、透過型の多層膜及び反射型の
多層膜の分光特性図、第４図は、透過型の多層膜を用い
た投写レンズの従来例を示す断面図である。
１・・・外鏡筒、２・・・内鏡筒、３・・・プラスチン
クレンズ、４・・・ガラスレンズ、５・・・反射ミラー
、６・・・赤色カット多層膜、７・・・投写レンズ、８
・・・第２ミラー、９・・・スクリーン、１０・・・ブ
ラウン管。
慎
図
投写レンズ
（〆）
塚妃傘楯
第
図
投写ゲ狂た学系
第
図
Ａ情［象イー■
ｔｑ透盪１罎）＠膿FIG. 1 is a sectional view of a projection lens in which a reflection mirror formed with the reflective multilayer film of the present invention is attached to a part of the outer lens barrel, and FIG.
The figure is a cross-sectional view of the optical system of a projection TV using the projection lens shown in Figure 1, and Figure 3 shows the emission distribution of the green phosphor and the transmissive multilayer film for canting the red component. FIG. 4, which is a spectral characteristic diagram of a reflective multilayer film, is a sectional view showing a conventional example of a projection lens using a transmissive multilayer film. 1... Outer barrel, 2... Inner barrel, 3... Plastic lens, 4... Glass lens, 5... Reflective mirror, 6... Red cut multilayer film, 7...・Projection lens, 8
...Second mirror, 9...Screen, 10...Cathode ray tube. Shinzu projection lens (〆) Tsukahi umbrella shield first picture projection game crazy school chart A feeling [Zou Yi ■ tq clearing 1] @pus
Claims (1)
筒の一部に反射ミラーを取り付け、前記反射ミラーの表
面に、投写型のブラウン管の緑色の発光スペクトルのう
ち赤色成分のみを透過させ、緑色より短波長の光を反射
するような多層膜を蒸着して、緑色の色再現性を向上さ
せる事を特徴とする投射型レンズ。In a rear projection type projection lens, a reflection mirror is attached to a part of the lens barrel that holds the lens, and the surface of the reflection mirror transmits only the red component of the green emission spectrum of the projection type cathode ray tube. A projection lens that improves green color reproducibility by depositing a multilayer film that reflects short wavelength light.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2163335A JPH0452613A (en) | 1990-06-21 | 1990-06-21 | Projection type lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2163335A JPH0452613A (en) | 1990-06-21 | 1990-06-21 | Projection type lens |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0452613A true JPH0452613A (en) | 1992-02-20 |
Family
ID=15771908
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2163335A Pending JPH0452613A (en) | 1990-06-21 | 1990-06-21 | Projection type lens |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0452613A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6135522A (en) * | 1984-07-27 | 1986-02-20 | Hitachi Ltd | Optical chemical vapor etching method |
| KR20010020044A (en) * | 1999-08-31 | 2001-03-15 | 구자홍 | Projection television |
| JP2007155129A (en) * | 2005-12-07 | 2007-06-21 | Minebea Co Ltd | Spherical bearing arrangement, its manufacturing method and split ball portion |
-
1990
- 1990-06-21 JP JP2163335A patent/JPH0452613A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6135522A (en) * | 1984-07-27 | 1986-02-20 | Hitachi Ltd | Optical chemical vapor etching method |
| KR20010020044A (en) * | 1999-08-31 | 2001-03-15 | 구자홍 | Projection television |
| JP2007155129A (en) * | 2005-12-07 | 2007-06-21 | Minebea Co Ltd | Spherical bearing arrangement, its manufacturing method and split ball portion |
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