JP3071169U - LCD projector - Google Patents

LCD projector

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Publication number
JP3071169U
JP3071169U JP2000000484U JP2000000484U JP3071169U JP 3071169 U JP3071169 U JP 3071169U JP 2000000484 U JP2000000484 U JP 2000000484U JP 2000000484 U JP2000000484 U JP 2000000484U JP 3071169 U JP3071169 U JP 3071169U
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Japan
Prior art keywords
optical system
light beam
liquid crystal
aperture
projector
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Expired - Fee Related
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JP2000000484U
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Japanese (ja)
Inventor
道郎 土田
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株式会社ランダック
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Abstract

(57)【要約】 【課題】 液晶投影機に於ける光源の効率化。 【解決手段】 円柱レンズ集光系の開発。 (57) [Summary] [PROBLEMS] To improve the efficiency of a light source in a liquid crystal projector. SOLUTION: Development of a cylindrical lens condensing system.

Description

【考案の詳細な説明】[Detailed description of the invention]

【0001】[0001]

【考案の属する技術分野】[Technical field to which the invention belongs]

本考案は液晶板の画像を拡大投影する液晶投影機に属する。 The present invention belongs to a liquid crystal projector for enlarging and projecting an image on a liquid crystal plate.

【0002】[0002]

【従来の技術】[Prior art]

従来の投影機では集光系として光軸を軸とする回転対象光学系を用いて居り 液晶板をの照明する光束は光軸に垂直な断面は略々円形と成っている。 液晶板アパ−チュアを透過した光束が投影レンズを透過し投影画面に到るが 光源から出た光束を有効に液晶板に到達させる手段として積分光学系、PS変 換光学系等が用いられて居る。 A conventional projector uses a rotating optical system whose axis is an optical axis as a light condensing system, and a light beam illuminating a liquid crystal plate has a substantially circular cross section perpendicular to the optical axis. The luminous flux transmitted through the aperture of the liquid crystal plate passes through the projection lens and reaches the projection screen, but as a means for effectively transmitting the luminous flux emitted from the light source to the liquid crystal plate, an integrating optical system, a PS conversion optical system, and the like are used. I'm here.

【0003】 従来の液晶投影機に於いては投影レンズを含む投影光学系が設置される機 体基部に置かれたため、投影画面位置が低く小人数は良くても多数の人員を対 象とするときは機体を傾け、或いは台の上に乗せる等、投影画面を見易くする 補助手段を必要として来た。In a conventional liquid crystal projector, since a projection optical system including a projection lens is placed at the base of the apparatus, a projection screen position is low and a small number of people are good. Occasionally, it has become necessary to provide auxiliary means to make the projected screen easier to see, such as tilting the aircraft or placing it on a table.

【0004】[0004]

【考案が解決しようとする課題】[Problems to be solved by the invention]

ランプから出た光束を球面光学系に依って収斂させれば集束光束は円形とな り此処に方形のアパ−チュアを於く事は必ず損失分が発生する。 円に内接する4辺形の内、最大の面積は正方形である事は数学で証明されて 居り辺の比が大きくなると方形の面積は減少し円面積に対する率も減少する。 If the light beam emitted from the lamp is converged by the spherical optical system, the focused light beam becomes circular, and a loss in the case of a square aperture is inevitable. It has been proved mathematically that the largest area of the quadrilateral inscribed in the circle is a square, and as the ratio of the sides increases, the area of the rectangle decreases and the ratio to the circle area also decreases.

【0005】 今此処に円で無く楕円を考慮すると、方形の辺の比に等しい径の比の楕円で 面積比が最大と成る事に基づきアパ−チュアを照明する光束を楕円とすれば有 効な光束を投影画面に送り出す事が可能となる。[0005] Considering an ellipse instead of a circle here, it is effective if the light beam illuminating the aperture is made elliptical based on the fact that the area ratio is maximized in an ellipse having a diameter ratio equal to the ratio of the sides of the rectangle. It is possible to send out a luminous flux to the projection screen.

【0006】 投影画面位置を上に挙げる為に補助手段を要しない機器として投影光学系を 機体から分離して機体上部支える事で投影画面を上げる事は可能に成るが分離 保持した侭では徒に機体が大きくなる。投影光学系と共に撮影光学系も上部に 保持する事で立体物の撮像投影として更に完成度を高める事が出来る。As a device that does not require auxiliary means to raise the projection screen position, it is possible to raise the projection screen by separating the projection optical system from the fuselage and supporting it on the upper part of the fuselage. The aircraft becomes larger. By holding the photographing optical system at the top together with the projection optical system, the degree of perfection can be further improved as imaging projection of a three-dimensional object.

【0007】[0007]

【課題を解決するための手段】[Means for Solving the Problems]

2光源合成方式に依って合成された光束は光軸に直角な切断面では径の比が2 :1となる楕円面を為すから、此の光束をアパ−チュアに縦横比に等しい径の比 を持つ楕円形とする為には、光軸をX軸とするとき、Y軸、Z軸の夫々に有効な 円柱レンズ又はト−リックレンズを用いる事で目的は達成される。以下円柱レン ズ又はト−リックレンズは代表して円柱レンズと記載する。 Since the light beam synthesized by the two light source synthesizing method forms an elliptical surface having a diameter ratio of 2: 1 on a cut plane perpendicular to the optical axis, this light beam is converted into an aperture with a diameter ratio equal to the aspect ratio. In order to obtain an elliptical shape having the following, when the optical axis is the X axis, the object is achieved by using a cylindrical lens or a toric lens effective for each of the Y axis and the Z axis. Hereinafter, a cylindrical lens or a toric lens is typically referred to as a cylindrical lens.

【0008】 2光源で合成された平行光束を用いた例で、図1は円柱レンズの主断面を含む 光学系の断面、図2は図1を直角方向から見た断面を表している。 図1に於いて第1円柱レンズで屈折した光束は図1では第2円柱レンズは平行 平板としての影響を受ける丈で、所定の焦点位置に収斂する。 図2で平行光束の侭の第1円柱レンズを透過した光束は図2で第2円柱レン ズの曲率に依って屈折し第2円柱レンズの焦点に収斂する。 この時に第1円柱レンズの焦点と第2円柱レンズの焦点を投影レンズの入射瞳 に一致させる事が入射光束をスクリ−ンに投影する為の必要条件となる事から各 円柱レンズの焦点比はアパ−チュアの縦横比に依って定めらる。FIG. 1 shows a cross section of an optical system including a main cross section of a cylindrical lens, and FIG. 2 shows a cross section of FIG. 1 viewed from a right angle direction. In FIG. 1, the light beam refracted by the first cylindrical lens converges to a predetermined focal position in FIG. 1 because the second cylindrical lens is affected by a parallel flat plate. In FIG. 2, the light beam transmitted through the first cylindrical lens in the form of a parallel light beam is refracted by the curvature of the second cylindrical lens in FIG. 2 and converges on the focal point of the second cylindrical lens. At this time, it is necessary to make the focal point of the first cylindrical lens and the focal point of the second cylindrical lens coincide with the entrance pupil of the projection lens, which is a necessary condition for projecting the incident light beam on the screen. It is determined by the aspect ratio of the aperture.

【0009】 図1は2光源を組み込んだ液晶投影機の各光学部品の配置及び機能の概念を示 す上面図である、a.は左右の光源ランプ、b.はランプからの光束を平行光束とす るコリメ−タ−レンズ、c.は二つの光束を合成するシンサイザ−反射鏡を表す。 以上が光源部であり、d.は3色分解プリズムで光束を指定された光の3原色に 分解し、進路を別に取らせる。 e.f.は夫々が入射光束をアパ−チュアに合わせて収斂させる円柱レンズの組合 わせであり、g.は各色に対応して作動する液晶板、h.は再び各色毎の像を一つに 併せるダイクロイックミラ−、j.は投影レンズを示す。FIG. 1 is a top view showing the concept of the arrangement and functions of each optical component of a liquid crystal projector incorporating two light sources, wherein a. Is a left and right light source lamp, b. Represents a collimator lens, and c. Represents a synthesizer-reflecting mirror that combines two light beams. The above is the light source section, and d. Uses the three-color separation prism to separate the light beam into the three primary colors of the specified light, and to take separate paths. ef is a combination of cylindrical lenses, each of which converges the incident light beam according to the aperture, g. is a liquid crystal plate that operates for each color, and h. is a dichroic that combines the images of each color into one again. Mirror, j. Indicates a projection lens.

【0010】 此の例は、光学的に次の様に構成されているが光源に就いては省略して、d.の プリズム以降に就いて説明する。 先に述べた如く、光源からの光束断面は径の比が2:1である楕円断面の平行 光線で有り液晶板の縦横比を越える比を持っている。此の状態では明らかに面積 比の損失が過大であり、これを修正するのが夫々に配置された組み合わせ円柱レ ンズe.f.であり、円柱レンズ群に依って2:1の楕円光束はアパ−チュアの縦横 比に等しい径の比を持つ楕円光束に変換され此の光束の焦点位置が投影レンズの 射出瞳位置に一致するときアパ−チュアを通過した全光束が投影画面に射出され 光学系として最大の映写画面照度を持つ事になる。In this example, the optical configuration is as follows, but the light source is omitted, and only the prism and the following d. Will be described. As described above, the cross section of the light beam from the light source is a parallel light beam having an elliptical cross section having a diameter ratio of 2: 1 and has a ratio exceeding the aspect ratio of the liquid crystal plate. In this state, the loss of the area ratio is clearly excessive, and it is the combination cylindrical lenses ef that are individually arranged that correct the loss, and the 2: 1 elliptical light beam is apertured depending on the cylindrical lens group. When the focal position of this light beam matches the exit pupil position of the projection lens, the total light beam that has passed through the aperture is emitted to the projection screen and is converted to the maximum as an optical system. Projection screen illuminance.

【0011】 図2.図3は円柱レンズに依って入射光線がアパ−チュアの求める縦横比に変 換される概念を示す。円柱レンズへの入射光束の縦横比をH1:H2とし、アパ −チュアの縦横比をHT:HYとするとき、焦点位置からX離れた位置での縦横 夫々の光線の通過高さは次式となる。 HY=H1・X/F1 HT=H2・X/F2 上式は近軸式であり、円柱レンズの肉厚等を無視して居るから実際には光線追 跡式に依る完全なデ−タでは円柱レンズの肉厚、収差等により若干の修正を必要 とする。FIG. FIG. 3 shows a concept in which an incident light beam is converted into an aspect ratio required by an aperture by a cylindrical lens. Assuming that the aspect ratio of the light beam incident on the cylindrical lens is H1: H2 and the aspect ratio of the aperture is HT: HY, the passing height of each of the vertical and horizontal rays at a position X away from the focal position is as follows. Become. HY = H1.X / F1 HT = H2.X / F2 The above equation is a paraxial equation, and the thickness of the cylindrical lens is ignored. Some correction is required due to the thickness and aberration of the cylindrical lens.

【0012】 機体を徒に大きくしない為に折り畳み可能なア−ムに依って基部より必要とさ れる位置に保持する事で補助手段無しに投影画面を高い位置にする事が可能で収 納時はア−ムを折り畳んで分離した光学系を基部と一体化して携帯に便とする事 が出来る。図6は上記の概念図を示す。A foldable arm is used to keep the body at a required position from the base by using a foldable arm so that the projection screen can be raised to a high position without auxiliary means. The optical system, which is separated by folding the arm, can be integrated with the base to make it portable. FIG. 6 shows the above conceptual diagram.

【0013】[0013]

【考案の効果】[Effect of the invention]

先に解決すべき問題点で挙げた如くアパ−チュアの縦横比が大きく成るに従い アパ−チュアの有効率が下がる事を挙げた。 今、例として縦横比16:9のアパ−チュアを挙げる。縦:横を32:18と するとき対角は36.715となり、アパ−チュア面積は576となる。 外接する円は直径が対角で有り、面積は1058.71で、面積比54.4% となる。 断面を円柱レンズに依る楕円とすれば、a=22.627、b=12.729 となり面積は904.839で面積比は63.6%となり、通過光束の増加律は 16.9%となり投影画面を明るく出来た。 As mentioned in the problems to be solved earlier, the aperture efficiency is reduced as the aspect ratio of the aperture is increased. An example of an aperture having an aspect ratio of 16: 9 will now be described. When the height: width is 32:18, the diagonal is 36.715, and the aperture area is 576. The circumscribed circle has a diagonal diameter, an area of 1058.71 and an area ratio of 54.4%. Assuming that the cross section is an ellipse formed by a cylindrical lens, a = 22.627, b = 12.729, the area is 904.839, the area ratio is 63.6%, and the increase rate of the passing light flux is 16.9%, and the projection is performed. The screen was brightened.

【0014】 光源として2光源方式を用いると光源からの射出光束が既に2:1の楕円状態 に有り、これをアパ−チュアの短辺に当てる時は機体の厚さを著しく減少出来て 機体の軽量化に効果を発揮する。球面レンズに依ってアパ−チュアを照明すれば ランプ及びレンズはアパ−チュアの対角をカバ−する径を必要とし必然的に厚さ を増す事になる。When the two light source system is used as the light source, the emitted light beam from the light source is already in an elliptic state of 2: 1. When this light beam is applied to the short side of the aperture, the thickness of the body can be significantly reduced, and Effective for weight reduction. If the aperture is illuminated by a spherical lens, the lamp and lens will require a diameter that covers the diagonal of the aperture and will necessarily increase in thickness.

【0015】 図3で示した如き光学系に小型CCDカメラを付加して同一外被内に納め基部 より上部に支持すれば投影光学系の位置が高く、したがって投影画面も高い位置 に映写される。同時にカメラ位置も高く立体物の撮影も便となる。If a small CCD camera is added to the optical system as shown in FIG. 3 and it is housed in the same casing and supported above the base, the position of the projection optical system is high, and therefore the projection screen is projected at a high position. . At the same time, the camera position is high and it is convenient to shoot three-dimensional objects.

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

【図1】液晶板を含む基本光学系を示す。FIG. 1 shows a basic optical system including a liquid crystal plate.

【図2】例1での第1円柱レンズの主断面を含む基本的
配置を示す。
FIG. 2 shows a basic arrangement including a main cross section of a first cylindrical lens in Example 1.

【図3】例1での図2に直角な第2円柱レンズの主断面
図を示す。
FIG. 3 shows a main cross-sectional view of a second cylindrical lens perpendicular to FIG. 2 in Example 1;

【図4】従来の投影光学系を基部に持つ投影機の例を示
す。
FIG. 4 shows an example of a projector having a conventional projection optical system as a base.

【図5】従来の投影光学系を基部に持つ投影機の例を示
す。
FIG. 5 shows an example of a projector having a conventional projection optical system as a base.

【図6】本案に依る光学系を分離した液晶投映機の概念
を示す。
FIG. 6 shows a concept of a liquid crystal projector in which an optical system according to the present invention is separated.

─────────────────────────────────────────────────────
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【手続補正書】[Procedure amendment]

【提出日】平成12年4月21日(2000.4.2
1)
[Submission date] April 21, 2000 (200.4.2
1)

【手続補正1】[Procedure amendment 1]

【補正対象書類名】明細書[Document name to be amended] Statement

【補正対象項目名】実用新案登録請求の範囲[Correction target item name] Claims for utility model registration

【補正方法】変更[Correction method] Change

【補正内容】[Correction contents]

【実用新案登録請求の範囲】[Utility model registration claims]

Claims (3)

【実用新案登録請求の範囲】[Utility model registration claims] 【請求項1】 アパ−チュアを照明する集光系として、
円柱レンズ又はト−リックレンズの組み合わせを用い、
照明光束をアパ−チュアの縦横比に近似した縦横比を持
つ楕円又は疑似楕円形状の光束とする液晶投影機。
1. A light collection system for illuminating an aperture,
Using a combination of cylindrical lenses or toric lenses,
A liquid crystal projector in which an illumination light beam is an elliptical or pseudo-elliptical light beam having an aspect ratio approximating the aspect ratio of an aperture.
【請求項2】 請求項1の集光系を用い、機体基部に光
学系を内臓する据置式液晶投影機又は光学系の一部又は
全部を基部から分離し折り畳み式ア−ムで機体上部に支
える投影機。
2. A stationary liquid crystal projector in which an optical system is built into a base of a body or a part or whole of an optical system is separated from the base and a folding arm is used at the top of the body using the light-collecting system of claim 1. Projector to support.
【請求項3】投影光学系及び撮影光学系を分離し同一外
被に納め折り畳み式ア−ムで機体上部に支える液晶式撮
像投影機。
3. A liquid crystal imaging projector in which a projection optical system and a photographing optical system are separated from each other and housed in the same jacket and supported on the upper part of the body by a folding arm.
JP2000000484U 2000-02-04 2000-02-04 LCD projector Expired - Fee Related JP3071169U (en)

Priority Applications (1)

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Publication Number Publication Date
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Family

ID=43303785

Family Applications (1)

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Country Status (1)

Country Link
JP (1) JP3071169U (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002323726A (en) * 2001-04-25 2002-11-08 Mac Science Co Ltd Radiographic image reader
JP2010170989A (en) * 2008-12-24 2010-08-05 Seiko Epson Corp Illumination apparatus and projector

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002323726A (en) * 2001-04-25 2002-11-08 Mac Science Co Ltd Radiographic image reader
JP2010170989A (en) * 2008-12-24 2010-08-05 Seiko Epson Corp Illumination apparatus and projector

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