JP3363736B2 - Projection device - Google Patents
Projection deviceInfo
- Publication number
- JP3363736B2 JP3363736B2 JP05135097A JP5135097A JP3363736B2 JP 3363736 B2 JP3363736 B2 JP 3363736B2 JP 05135097 A JP05135097 A JP 05135097A JP 5135097 A JP5135097 A JP 5135097A JP 3363736 B2 JP3363736 B2 JP 3363736B2
- Authority
- JP
- Japan
- Prior art keywords
- glass plate
- lens
- liquid crystal
- beam splitter
- light
- 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.)
- Expired - Fee Related
Links
Landscapes
- Projection Apparatus (AREA)
- Transforming Electric Information Into Light Information (AREA)
- Overhead Projectors And Projection Screens (AREA)
- Liquid Crystal (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、振動面が揃った強
力な光で液晶パネルを照射して、液晶パネルの画像をス
クリーン等に照射する投写装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projection device that irradiates a liquid crystal panel with strong light having a vibrating surface to illuminate an image on the liquid crystal panel onto a screen or the like.
【０００２】[0002]
【従来の技術】該投写装置には、図７に示すものがあ
る。光源(１)からの光は、偏光ビームスプリッタ(２)に
よって、垂直偏光たるＳ波の一部又は全てが反射され、
水平偏光たるＰ波及び前記Ｓ波の一部が通過する。該通
過光は夫々複数の凸レンズ(60)(50)を規則的に配列して
成るレンズ体(６)(５)を通過して、液晶パネル(４)を照
射する。液晶パネル(４)の画像は、照射光に照らされ
て、投写レンズ(７)によりスクリーン(８)上に照射され
る。ここに於いて、偏光ビームスプリッタ(２)は、通常
プリズムを用いることが多いが、コスト低減に鑑みて、
図２に示すものが提案されている。2. Description of the Related Art One such projection device is shown in FIG. The light from the light source (1) is reflected by the polarization beam splitter (2) as a part or all of S-wave that is vertically polarized light.
A horizontally polarized P wave and a part of the S wave pass through. The passing light passes through lens bodies (6) and (5) each having a plurality of convex lenses (60) and (50) arranged regularly, and illuminates a liquid crystal panel (4). The image on the liquid crystal panel (4) is illuminated by the illumination light, and is projected onto the screen (8) by the projection lens (7). In this case, the polarization beam splitter (2) usually uses a prism, but in view of cost reduction,
The one shown in FIG. 2 has been proposed.
【０００３】これは、複数枚のガラス板(30)(30)を重ね
合わせて、ガラス板群(３)を構成し、該ガラス板群(３)
を、ブリュースター角に対応して傾けたものである。こ
こで、ブリュースター角とは、ガラス板(30)の屈折率を
ｎとしたときに、
ｎ＝ｔａｎθ
で表される角度θを意味し、ガラス板(30)の法線方向と
入射光が、ブリュースター角θをなしたときに、１枚の
ガラス板(30)毎に、Ｐ波は１００％透過し、Ｓ波は約１
５％反射する事が経験則的に知られている。従って、ガ
ラス板(30)を４〜５枚重ねたガラス板群(３)にあって
は、Ｐ波が１００％透過し、Ｓ波が５０％反射する(特
開平３−１０２１８号参照)。偏光ビームスプリッタ
(２)は、上下に配備された一対のガラス板群(３)(３a)
の上端部と下端部を突き合わせてなる。このように、複
数のガラス板(30)(30)を組み合わせたガラス板群(３)に
より、偏光ビームスプリッタ(２)を構成することで、コ
スト低減を図っている。In this, a plurality of glass plates (30) (30) are stacked to form a glass plate group (3), and the glass plate group (3) is formed.
Is tilted according to the Brewster's angle. Here, the Brewster angle means an angle θ represented by n = tan θ, where n is the refractive index of the glass plate (30), and the normal direction of the glass plate (30) and the incident light are , When the Brewster angle θ is set, 100% of P wave is transmitted and about 1 of S wave is transmitted for each glass plate (30).
It is empirically known to reflect 5%. Therefore, in the glass plate group (3) in which 4 to 5 glass plates (30) are stacked, 100% of the P wave is transmitted and 50% of the S wave is reflected (see JP-A-3-10218). Polarizing beam splitter
(2) is a pair of glass plate groups (3) (3a) arranged vertically
The upper end and the lower end of the are abutted. Thus, the polarization beam splitter (2) is configured by the glass plate group (3) in which a plurality of glass plates (30) and (30) are combined to reduce the cost.
【０００４】[0004]
【発明が解決しようとする課題】入射光は周知の如く、
ガラス板(30)内に入ると屈折して進む。図２に於いて、
上側のガラス板群(３a)の下端部に入射する光は、上向
きに屈折し、下側のガラス板群(３)の上端部に入射する
光は、下向きに屈折する。光はガラス板(30)の端面に当
たると、乱反射して、ガラス板群(３)を殆ど通過しな
い。従って、両ガラス板群(３)(３a)の突き合わせ部分
に於いて、図２に斜線で示すように、光が殆ど通過しな
い影の部分ができる。この影の部分が、図８に示すよう
に、第１レンズ体(６)の凸レンズ(60)の前面に入射する
と、図９に斜線で示すように、液晶パネル(４)はその部
分だけ暗く照射される。その結果、光利用効率が低下
し、スクリーン(８)上に照射されると、画面が暗くな
る。本発明は、ガラス板群を連ねた偏光ビームスプリッ
タに於いて、かかる影の部分を見えなくすることを目的
とする。As is well known, incident light is
When it enters the glass plate (30), it refracts and advances. In FIG.
Light entering the lower end of the upper glass plate group (3a) is refracted upward, and light entering the upper end of the lower glass plate group (3) is refracted downward. When the light hits the end face of the glass plate (30), it is diffusely reflected and hardly passes through the glass plate group (3). Therefore, in the abutting portion of both glass plate groups (3) and (3a), there is a shaded portion where almost no light passes, as shown by the diagonal lines in FIG. When this shaded portion is incident on the front surface of the convex lens (60) of the first lens body (6) as shown in FIG. 8, the liquid crystal panel (4) is darkened only by that portion as shown by the diagonal lines in FIG. Is irradiated. As a result, the light utilization efficiency is reduced, and when the light is projected onto the screen (8), the screen becomes dark. An object of the present invention is to make such a shaded portion invisible in a polarization beam splitter in which a group of glass plates are connected.
【０００５】[0005]
【課題を解決する為の手段】光源(１)と、光源(１)から
の光のうちＰ波の全てとＳ波の一部を通過させる偏光ビ
ームスプリッタ(２)と、該偏光ビームスプリッタ(２)を
通過した光により照射される液晶パネル(４)と、投写レ
ンズ(７)とを具え、偏光ビームスプリッタ(２)は、法線
が光軸に対し、ブリュースター角だけ傾いた複数枚のガ
ラス板(30)(30)を重ね合せたガラス板群(３)(３a)を上
下に連ねた投写装置に於いて、ガラス板群(３)(３a)
は、先端部を突き合わせて山形に形成され、液晶パネル
(４)と偏光ビームスプリッタ(２)との間には、複数の凸
レンズ(60)(50)を規則的に配列してなり、各凸レンズ(6
0)(50)を通過した光が重なり合って液晶パネル(４)の全
面を照射する第１、第２レンズ体(６)(５)が設けられ、
両レンズ体(６)(５)は、ガラス板群(３)(３a)の突き合
わせ部分から生じる影の部分を、液晶パネル(４)の上下
両端部に結像させる位置に設けられている。[Means for Solving the Problem] From the light source (1) and the light source (1)
Of all the P-waves and a part of the S-waves of the light, a liquid crystal panel (4) illuminated by the light passing through the polarization beam splitter (2), and a projection lens ( 7) and a polarizing beam splitter (2), a glass plate group (3) (3) (where the normal line is inclined with respect to the optical axis by a Brewster's angle, a plurality of glass plates (30) (30) In a projection device in which 3a) are vertically arranged, a glass plate group (3) (3a)
Is a chevron-shaped LCD panel
A plurality of convex lenses (60) and (50) are regularly arranged between (4) and the polarization beam splitter (2).
There are provided first and second lens bodies (6) and (5) for irradiating the entire surface of the liquid crystal panel (4) with the lights passing through the light sources (0) and (50) overlapping each other.
Both lens bodies (6) and (5) are provided at positions where the shadow portions generated from the abutting portions of the glass plate groups (3) and (3a) are imaged on the upper and lower ends of the liquid crystal panel (4).
【０００６】[0006]
【作用及び効果】ガラス板群(３)(３a)の突き合わせ部
分から生じる影の部分は、第１、第２レンズ体により、
液晶パネル(４)の上下端部に結像する。従って、液晶パ
ネル(４)の画像がスクリーンに照射されても、スクリー
ン上の目立つ箇所に影が映ることはなく、違和感のない
画像が得られる。[Operation and effect] The shadow portion generated from the butted portion of the glass plate group (3) (3a) is formed by the first and second lens bodies.
An image is formed on the upper and lower ends of the liquid crystal panel (4). Therefore, even if the image of the liquid crystal panel (4) is projected onto the screen, a shadow is not projected at a conspicuous place on the screen, and an image without a sense of discomfort can be obtained.
【０００７】[0007]
【発明の実施の形態】以下、本発明の一例を図を用いて
説明する。従来と同一構成については、同一符号を用い
て説明する。図１は、投写装置の側面図である。光源
(１)からの光は、リフレクタ(10)により反射されて直進
し、従来と同様に、偏光ビームスプリッタ(２)に入射す
る。入射した光は、偏光ビームスプリッタ(２)にて、Ｐ
波とＳ波の一部が通過を許され、Ｓ波はその一部が反射
される。偏光ビームスプリッタ(２)を通過した光は、複
数の凸レンズ(60)(60)を規則的に配列してなる第１レン
ズ体(６)(図３参照)、及び第１レンズ体(６)と同数の凸
レンズ(50)(50)を配列した第２レンズ体(５)に入射す
る。BEST MODE FOR CARRYING OUT THE INVENTION An example of the present invention will be described below with reference to the drawings. The same configurations as the conventional one will be described using the same reference numerals. FIG. 1 is a side view of the projection device. light source
The light from (1) is reflected by the reflector (10), travels straight, and enters the polarization beam splitter (2) as in the conventional case. The incident light is converted into P by the polarization beam splitter (2).
A part of the wave and the S wave is allowed to pass, and a part of the S wave is reflected. The light that has passed through the polarization beam splitter (2) has a first lens body (6) (see FIG. 3) in which a plurality of convex lenses (60) (60) are regularly arranged, and a first lens body (6). The same number of convex lenses (50) and (50) are incident on the second lens body (5).
【０００８】光源(１)からの光を、２つのレンズ体(６)
(５)を用いて照射するのは、リフレクタ(10)により反射
される光は、完全な平行光ではないから、２つのレンズ
体(６)(５)により照射範囲を確実に設定しているのであ
る。第２レンズ体(５)を通過した光は、液晶パネル(４)
を照射し、該液晶パネル(４)の画像は投写レンズ(７)に
より、スクリーン(８)に照射される。通常は液晶パネル
(４)の直前に偏光板を設けているが、該偏光板のみによ
ってＰ波だけを通過させようとすると、光源(１)からの
光の大部分が偏光板を照射し、偏光板の温度が高くな
る。従って、偏光板の故障を招来する虞れがあるから、
この虞れを防ぐために、偏光板の上流側で、予めＰ波と
Ｓ波を分離しているのである。The light from the light source (1) is divided into two lens bodies (6).
Irradiation using (5) is such that the light reflected by the reflector (10) is not perfectly parallel light, so the irradiation range is reliably set by the two lens bodies (6) and (5). Of. The light passing through the second lens body (5) is the liquid crystal panel (4).
And the image of the liquid crystal panel (4) is projected onto the screen (8) by the projection lens (7). Normally a liquid crystal panel
A polarizing plate is provided immediately before (4), but if only the P wave is allowed to pass by the polarizing plate alone, most of the light from the light source (1) irradiates the polarizing plate and Becomes higher. Therefore, there is a possibility that the polarizing plate may be damaged.
In order to prevent this fear, the P wave and the S wave are separated in advance on the upstream side of the polarizing plate.
【０００９】図６に示すように、第１レンズ体(６)の各
凸レンズ(60)は、第１レンズ体(６)の中心部から外周部
にかけて、曲率半径中心位置が夫々異なるものが順に配
置されている。各凸レンズ(60)の焦点位置Ｐは、第１レ
ンズ体(６)の外周部に位置するものほど、凸レンズ(60)
中心を含む水平面Ｚに対して、光軸(15)寄りに設定され
ている。尚、第２レンズ体(５)は凸レンズの膨らみ方向
が、第１レンズ体(６)とは反対方向を向いているが、第
１レンズ体(６)と同様の構成である。このような特殊な
形状の凸レンズを配列して、第１、第２レンズ体(６)
(５)の各凸レンズ(60)(50)は、液晶パネル(４)の全面を
照らす。即ち、液晶パネル(４)には、各凸レンズ(60)(5
0)を通過した光が重なり合っている。As shown in FIG. 6, each convex lens (60) of the first lens body (6) has a different center position of the radius of curvature in order from the central portion to the outer peripheral portion of the first lens body (6). It is arranged. The focus position P of each convex lens (60) is closer to the outer periphery of the first lens body (6), the more convex lens (60)
It is set near the optical axis (15) with respect to the horizontal plane Z including the center. The second lens body (5) has the same configuration as the first lens body (6), although the convex lens swelling direction is opposite to the first lens body (6). By arranging convex lenses of such a special shape, the first and second lens bodies (6)
The convex lenses (60) and (50) of (5) illuminate the entire surface of the liquid crystal panel (4). That is, each convex lens (60) (5
Lights that have passed through 0) are overlapping.
【００１０】偏光ビームスプリッタ(２)は、図２に示す
ように、複数のガラス板(30)(30)を重ね合わせたガラス
板群(３)を複数個上下に連ねて成る。前記の如く、上下
で隣り合うガラス板群(３)(３a)の突き合わせ部分に於
いて、斜線で示すように、光が通過しない影の部分が生
じる。本例にあっては、該影の部分が液晶パネル(４)の
上下端部に写るように、両レンズ体(６)(５)を配置して
いる。図４に示すように、偏光ビームスプリッタ(２)内
のガラス板群(３)(３a)の突き合わせ部分は、第１レン
ズ体(６)の各凸レンズ(60)の上下端部に対向している。
図４に係わる投写装置にあっては、第１レンズ体(６)の
凸レンズ(60)の中心部に入射した光は、点線で示すよう
に、第２レンズ体(５)の中心部を通過し、液晶パネル
(４)の中心部に入射する。As shown in FIG. 2, the polarization beam splitter (2) comprises a plurality of glass plate groups (3) in which a plurality of glass plates (30) (30) are superposed one on top of the other. As described above, in the abutting portions of the glass plate groups (3) and (3a) that are vertically adjacent to each other, a shaded portion through which light does not pass is generated as shown by the diagonal lines. In this example, both lens bodies (6) and (5) are arranged so that the shaded portions are reflected in the upper and lower ends of the liquid crystal panel (4). As shown in FIG. 4, the abutting portions of the glass plate groups (3) and (3a) in the polarization beam splitter (2) face the upper and lower ends of the respective convex lenses (60) of the first lens body (6). There is.
In the projection device according to FIG. 4, the light incident on the central portion of the convex lens (60) of the first lens body (6) passes through the central portion of the second lens body (5) as shown by the dotted line. LCD panel
It is incident on the center of (4).
【００１１】前記の如く、第１、第２レンズ体(６)(５)
の各凸レンズ(60)(50)は、液晶パネル(４)の全面を照ら
す。第１レンズ体(６)の各凸レンズ(60)の上下端部に入
射した光は、実線で示すように、第１レンズ体(６)及び
第２レンズ体(５)の各凸レンズ(50)を通過した後に、液
晶パネル(４)の上下両端部に結像する。即ち、偏光ビー
ムスプリッタ(２)の影の部分は、図５に斜線で示すよう
に、液晶パネル(４)の上下両端部に結像され、スクリー
ン(８)上に写し出されることはない。その結果、スクリ
ーン(８)に違和感がある画像が表示されることを防ぐこ
とができる。As described above, the first and second lens bodies (6) (5)
The respective convex lenses (60) and (50) illuminate the entire surface of the liquid crystal panel (4). The light incident on the upper and lower ends of each convex lens (60) of the first lens body (6) is, as shown by the solid line, each convex lens (50) of the first lens body (6) and the second lens body (5). After passing through, images are formed on the upper and lower ends of the liquid crystal panel (4). That is, the shaded portion of the polarization beam splitter (2) is imaged on the upper and lower end portions of the liquid crystal panel (4) and is not projected on the screen (8) as shown by the diagonal lines in FIG. As a result, it is possible to prevent the display of an image with a feeling of strangeness on the screen (8).
【００１２】上記例では、ガラス板群(３)の数と、第１
レンズ体(６)の凸レンズ(60)の数が一致しているが、ガ
ラス板群(３)(３a)の突き合わせ部分が凸レンズ(60)の
上下端部に対応していればよく、必ずしも同数である必
要はない。In the above example, the number of glass plate groups (3) and the first
The number of convex lenses (60) of the lens body (6) is the same, but it is sufficient that the abutting portions of the glass plate groups (3) (3a) correspond to the upper and lower ends of the convex lens (60), and the same number is not always necessary. Does not have to be.
【００１３】上記実施例の説明は、本発明を説明するた
めのものであって、特許請求の範囲に記載の発明を限定
し、或は範囲を減縮する様に解すべきではない。又、本
発明の各部構成は上記実施例に限らず、特許請求の範囲
に記載の技術的範囲内で種々の変形が可能であることは
勿論である。The above description of the embodiments is for explaining the present invention, and should not be construed as limiting the invention described in the claims or reducing the scope. The configuration of each part of the present invention is not limited to the above-mentioned embodiment, and it goes without saying that various modifications can be made within the technical scope described in the claims.
【図１】投写装置の側面図である。FIG. 1 is a side view of a projection device.
【図２】偏光ビームスプリッタ内のガラス板群の配置を
示す側面図である。FIG. 2 is a side view showing an arrangement of glass plate groups in a polarization beam splitter.
【図３】レンズ体の斜視図である。FIG. 3 is a perspective view of a lens body.
【図４】液晶パネルへの照射状態を示す図である。FIG. 4 is a diagram showing an irradiation state of a liquid crystal panel.
【図５】上下端部に影が写し出された液晶パネルの正面
図である。FIG. 5 is a front view of a liquid crystal panel in which shadows are projected on upper and lower ends.
【図６】第１レンズ体の側面図である。FIG. 6 is a side view of the first lens body.
【図７】従来の投写装置の側面図である。FIG. 7 is a side view of a conventional projection device.
【図８】同上の第１レンズ体への照射状態を示す側面図
である。FIG. 8 is a side view showing an irradiation state of the first lens body of the above.
【図９】画面内に影が写し出された液晶パネルの正面図
である。FIG. 9 is a front view of a liquid crystal panel in which a shadow is projected on the screen.
(１) 光源 (２) 偏光ビームスプリッタ (３) ガラス板群 (４) 液晶パネル (５) 第２レンズ体 (６) 第１レンズ体 (1) Light source (2) Polarizing beam splitter (3) Glass plate group (4) LCD panel (5) Second lens body (6) First lens body
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ Ｈ０４Ｎ 5/74 Ｈ０４Ｎ 5/74 Ａ ─────────────────────────────────────────────────── ─── Continued Front Page (51) Int.Cl. 7 Identification Code FI H04N 5/74 H04N 5/74 A
Claims (2)
波の全てとＳ波の一部を通過させる偏光ビームスプリッ
タ(２)と、該偏光ビームスプリッタ(２)を通過した光に
より照射される液晶パネル(４)と、投写レンズ(７)とを
具え、偏光ビームスプリッタ(２)は、法線が光軸に対
し、ブリュースター角だけ傾いた複数枚のガラス板(30)
(30)を重ね合せたガラス板群(３)(３a)を上下に連ねた
投写装置に於いて、 ガラス板群(３)(３a)は、先端部を突き合わせて山形に
形成され、 液晶パネル(４)と偏光ビームスプリッタ(２)との間に
は、複数の凸レンズ(60)(50)を規則的に配列してなり、
各凸レンズ(60)(50)を通過した光が重なり合って液晶パ
ネル(４)の全面を照射する第１、第２レンズ体(６)(５)
が設けられ、 両レンズ体(６)(５)は、ガラス板群(３)(３a)の突き合
わせ部分から生じる影の部分を、液晶パネル(４)の上下
両端部に結像させる位置に設けられたことを特徴とする
投写装置。1. A light source (1) and P of light from the light source (1)
A polarizing beam splitter (2) for passing all of the waves and a part of the S waves, a liquid crystal panel (4) illuminated by the light passing through the polarizing beam splitter (2), and a projection lens (7). , The polarization beam splitter (2) is composed of a plurality of glass plates (30) whose normals are inclined by Brewster's angle with respect to the optical axis.
In a projection device in which glass plate groups (3) and (3a) in which (30) are superposed are vertically arranged, the glass plate groups (3) and (3a) are formed in a chevron shape by abutting the tips thereof. A plurality of convex lenses (60) and (50) are regularly arranged between (4) and the polarization beam splitter (2),
First and second lens bodies (6) and (5) that illuminate the entire surface of the liquid crystal panel (4) by overlapping the lights that have passed through the respective convex lenses (60) and (50).
The two lens bodies (6) and (5) are provided at positions where the shadow portions generated from the butted portions of the glass plate groups (3) and (3a) are imaged on the upper and lower ends of the liquid crystal panel (4). A projection device characterized by the above.
数の凸レンズ(60)(50)を配列して成り、ガラス板群(３)
(３a)の突き合わせ部分は、凸レンズ(60)の上端部又は
下端部に対向している請求項１に記載の投写装置。2. The first and second lens bodies (6) and (5) are formed by arranging the same number of convex lenses (60) and (50), respectively, and a glass plate group (3).
The projection device according to claim 1, wherein the butted portion of (3a) faces the upper end or the lower end of the convex lens (60).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05135097A JP3363736B2 (en) | 1997-03-06 | 1997-03-06 | Projection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05135097A JP3363736B2 (en) | 1997-03-06 | 1997-03-06 | Projection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10246871A JPH10246871A (en) | 1998-09-14 |
| JP3363736B2 true JP3363736B2 (en) | 2003-01-08 |
Family
ID=12884487
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP05135097A Expired - Fee Related JP3363736B2 (en) | 1997-03-06 | 1997-03-06 | Projection device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3363736B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3622556B2 (en) * | 1999-02-23 | 2005-02-23 | セイコーエプソン株式会社 | Illumination optical system and projection display device |
| JP3764686B2 (en) | 2002-02-07 | 2006-04-12 | 日本電信電話株式会社 | Optical transmission circuit |
-
1997
- 1997-03-06 JP JP05135097A patent/JP3363736B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH10246871A (en) | 1998-09-14 |
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