JP3711041B2 - Projector device - Google Patents

Description

【００２３】
表１の結果から明らかな様に、全体として左右非対称の開口パターンを有するハウジング(41b)(41c)においては、左右対称の開口パターンを有するハウジング(41a)よりも、最高温度が低く抑えられると共に、最高温度と最低温度の差が小さく抑えられており、左右非対称の開口パターンを有するハウジングの効果が裏付けられる。
【００２４】
又、図６及び図７に示すランプユニット(４)においては、送風ファン(44)が回転することによって、下半ケース(11)の吸気孔(16)から送風ファン(44)の吸気口(43)を経て空気が吸い込まれると共に、吐出口(48)から空気が吐出され、吐出された空気は、ダクト(47)を経て、ランプ(５)の空気導入口(52)からリフレクター(51)の内側へ導入される。ここで、空気導入口(52)は発光部(50)へ向けて開設されているため、リフレクター(51)の内側に導入された空気は、発光部(50)に対して直接に吹き付けられる。又、リフレクター(51)の凹曲面に沿って気流が案内されることにより、発光部(50)を包囲する旋回流が発生する。
【００２５】
この結果、リフレクター(51)の内側へ導入された空気は、ランプ(５)の発光部(50)と高い熱伝達率で熱交換を行なって、発光部(50)を強制空冷した後、空気導出口(54)からリフレクター(51)の外側へ導出される。
空気導出口(54)からリフレクター(51)の外側へ導出された空気は、リフレクター(51)の周囲を流れる気流と合流して、排気ファン(40)へ向かって流れる。排気ファン(40)を通過した気流は、図１に示す前面パネル(13)の排気孔(15)から前方へ排出される。
【００２６】
上述の如く、ランプ(５)の内、最も高温となる発光部(50)が効率的に冷却されるので、排気ファン(40)や送風ファン(44)の風量を少なく設定することが可能であり、これによって、これらのファン(40)(44)から発生する騒音を大幅に低減させることが出来る。
【００２７】
又、本発明の液晶プロジェクターにおいては、ランプユニット(４)からの白色光の出射方向と、光学ユニット(２)からの映像光の投射方向とを、互いに１８０度異なる逆方向に設定した光学系の採用によって、ケーシング(１)の前面パネル(13)に投射窓(14)と排気孔(15)とを併設しているため、ランプユニット(４)に内蔵されているファンから発生する騒音は、スクリーンに向かって光投射方向に放出されることになる。これによって、液晶プロジェクターよりもスクリーンから離れた後方位置の視聴者には、ファンからの騒音が届き難くなる。
【００２８】
冷却ユニット ( ６ )
図３及び図４に示す如く、光学ユニット(２)の下方位置には、光学ユニット(２)を冷却するために、冷却ユニット(６)が配置される。
冷却ユニット(６)は、図１１及び図１２に示す如く扁平なハウジング(60)を具えており、該ハウジング(60)の表面に開設した４つの空気吹出し口(63)(64)(65)(69)から上方の光学ユニット(２)の４つの発熱部へ向けて空気を吹き出すものである。
【００２９】
前記４つの空気吹出し口(63)(64)(65)(69)の内、図１６に示す３つの空気吹出し口(63)(64)(65)はそれぞれ、色合成装置(３)を構成する青用入射側偏光板(31)、青用液晶パネル(32)及び青用出射側偏光板(33)へ向けて開口する青用の空気吹出し口と、緑用入射側偏光板(34)、緑用液晶パネル(35)及び緑用出射側偏光板(36)へ向けて開口する緑用の空気吹出し口と、赤用入射側偏光板(37)、赤用液晶パネル(38)及び赤用出射側偏光板(39)へ向けて開口する赤用の空気吹出し口となっている。
又、図１２に示す残りの１つの空気吹出し口(69)は、図２に示す偏光ビームスプリッター(24)へ向けて開口する偏光ビームスプリッター(以下、ＰＢＳという)用の空気吹出し口となる。
【００３０】
冷却ユニット(６)のハウジング(60)は、図１４に示す如く本体(61)と蓋体(62)から構成され、蓋体(62)に、前述の４つの空気吹出し口(63)(64)(65)(69)が開設されている。ハウジング本体(61)には、第１〜第３の３つの冷却ファン(66)(67)(68)が一列に配備されており、これらの冷却ファン(66)(67)(68)から吐出される空気は、複数の仕切り壁によって形成された流路網(８)を経て分流され或いは合流して、後述の如く適切な流量の４つの流れとなり、４つの空気吹出し口(63)(64)(65)(69)から吹き出される。
【００３１】
即ち、色合成装置(３)を構成する各色用の入射側偏光板、液晶パネル及び出射側偏光板(以下、これら３枚を一組として偏光／液晶部という)の内、青用の偏光／液晶部の発熱量が最も大きいため、各冷却ファン(66)(67)(68)から吐出される気流を二分割し、分割された一方の気流をそれぞれ、緑用偏光／液晶部、赤用偏光／液晶部及びＰＢＳの冷却に割り当て、分割された他方の気流を全て青用の偏光／液晶部に割り当てるのである。
【００３２】
そこで、図１４及び図１５に示す如く、流路網(８)として、第１冷却ファン(66)から青用空気吹出し口(63)及びＰＢＳ用空気吹出し口(69)へ至る流路と、第２冷却ファン(67)から青用空気吹出し口(63)及び緑用空気吹出し口(64)へ至る流路と、第３冷却ファン(68)から青用空気吹出し口(63)及び赤用空気吹出し口(65)へ至る流路とを形成する。
【００３３】
ＰＢＳ用空気吹出し口(69)には、案内羽根(89)を取り付けて、第１冷却ファン(66)からの気流を偏光ビームスプリッター(24)の高温部、即ち光出射面の中央部へ高速で吹き付ける。
又、青用偏光／液晶部、緑用偏光／液晶部、及び赤用偏光／液晶部の冷却については、入射側と出射側に対する風量と風向を適切に調整するために、後述の如く気流案内面を形成する。
【００３４】
即ち、図１３に示す如く、青用空気吹出し口(63)には、第１〜第４仕切り壁(81)(82)(83)(84)を設置して、第１冷却ファン(66)からの気流を吹き出すべき第１空気吹出し部(91)と、第２冷却ファン(67)からの気流を吹き出すべき第２空気吹出し部(92)と、第３冷却ファン(68)からの気流を吹き出すべき第３空気吹出し部(93)とを形成する。又、第１仕切り壁(81)及び第３仕切り壁(83)にはそれぞれ気流案内面(図示省略)を形成して、第２冷却ファン(67)及び第３冷却ファン(68)から青用偏光／液晶部の入射側と出射側への気流の風向と風量を調整する。
緑用空気吹出し口(64)には、案内羽根(85)を設置して、その両側に２つの空気吹出し部(95)(96)を形成し、第２冷却ファン(67)から緑用偏光／液晶部の入射側と出射側への気流の風向と風量を調整する。
更に赤用空気吹出し口(65)には、第５仕切り壁(86)と案内羽根(87)を設置して、２つの空気吹出し部(97)(98)を形成し、第３冷却ファン(68)から赤用偏光／液晶部の入射側と出射側への気流の風向と風量を調整する。
【００３５】
図１６は、青用空気吹出し口(63)と青用偏光／液晶部の位置関係、緑用空気吹出し口(64)と緑用偏光／液晶部の位置関係、並びに、赤用空気吹出し口(65)と赤用偏光／液晶部の位置関係を表わしており、上述の如く風量及び風向の調節された気流が、各偏光／液晶部の入射側及び出射側へ吹き付けられて、効果的な冷却が行なわれる。
【００３６】
図１４に示す第１冷却ファン(66)、第２冷却ファン(67)及び第３冷却ファン(68)は、何れもケーシングの片面に吸い込み口を有する片吸い込み式のシロッコファンである。第１冷却ファン(66)及び第２冷却ファン(67)は、それぞれの吸い込み口(66a)(67a)を上方に向けた姿勢でハウジング本体(61)に設置されており、それぞれの吐出口(66b)(67b)は、流路網(８)の入口に向いている。又、第３冷却ファン(68)は、吸い込み口を下方に向けた姿勢でハウジング本体(61)に設置されており、吐出口(68b)は、流路網(８)の入口に向いている。
【００３７】
ハウジング本体(61)の背面には、図１４に示す如く第１冷却ファン(66)、第２冷却ファン(67)及び第３冷却ファン(68)に対応して、第１背面吸気窓(71)、第２背面吸気窓(72)及び第３背面吸気窓(73)が開設されている。又、ハウジング本体(61)の底面には、図１８に示す如く第３冷却ファン(68)に対応して、下面吸気窓(74)が開設されている。
【００３８】
図１７は、冷却ユニット(６)の第２冷却ファン(67)が設置された位置における断面構造を表わし、第１冷却ファン(66)が設置された位置における断面構造も同様である。又、図１８は、冷却ユニット(６)の第３冷却ファン(68)が設置された位置における断面構造を表わしている。
第１冷却ファン(66)及び第２冷却ファン(67)の上方には、蓋体(62)の上壁との間に、可及的に大きなスペースＳが設けられており、図１７中に矢印で示す様に、ハウジング本体(61)の背面吸気窓(71)(72)から吸い込まれた空気が該スペースを経て第１及び第２冷却ファン(66)(67)の吸い込み口(66a)(67a)へ流入する。又、第３冷却ファン(68)の下方には、ハウジング本体(61)の底壁との間に、可及的に大きなスペースＳが設けられており、図１８中に矢印で示す様に、ハウジング本体(61)の背面吸気窓(73)及び下面吸気窓(74)から吸い込まれた空気が該スペースを経て第３冷却ファン(68)の吸い込み口(68a)へ吸い込まれる。
【００３９】
尚、ハウジング本体(61)の３つの背面吸気窓(71)(72)(73)は、ケーシング(１)の背面に開設された吸気孔(図示省略)と繋がり、ハウジング本体(61)の下面吸気窓(74)は、ケーシング(１)の底壁に開設された吸気孔(図示省略)と繋がる。
【００４０】
上述の如く、各冷却ファン(66)(67)(68)の吸い込み口(66a)(67a)(68a)は何れも、ケーシング(１)の外部と繋がり、ケーシング(１)の内部とは、ハウジング(60)の壁面が仕切りとなって、繋がりがないので、各冷却ファン(66)(67)(68)には、専らケーシング(１)外部の低温の空気のみが吸い込まれ、ケーシング(１)内部の高温の空気が吸い込まれることはない。
この結果、光学ユニット(２)へ向けて低温の空気が吹き出されることとなり、少ない風量で光学ユニット(２)を十分に冷却することが出来る。
【００４１】
又、冷却ユニット(６)の各冷却ファン(66)(67)(68)として片吸い込み式のシロッコファンを採用し、吸い込み口(66a)(67a)(68a)が開設されたファン側面とハウジング(60)壁面との間に、十分な広さのスペースＳを設けているので、該スペースを経てファンに吸い込まれる空気の流動抵抗は低いものとなる。この結果、各冷却ファンとして、回転速度の低い低出力のシロッコファンを採用することが可能となる。
【００４２】
上記本発明の液晶プロジェクターによれば、ランプ(５)や光学ユニット(２)を冷却するための冷却系統の改善によって、従来よりも少ない風量で効果的な冷却を行なうことが出来るので、冷却空気を送り込むためのファンを低い回転速度で運転することが可能であり、これによって、ファンから発生する騒音を大幅に低減させることが出来る。
【図面の簡単な説明】
【図１】本発明に係る液晶プロジェクターの斜視図である。
【図２】該液晶プロジェクターに装備されているランプユニット及び光学ユニットの光学系の構成を示す図である。
【図３】該液晶プロジェクターの分解斜視図である。
【図４】該液晶プロジェクターにおいて、下半ケースからランプユニット、光学ユニット及び冷却ユニットを取り外した状態を示す斜視図である。
【図５】該液晶プロジェクターにおいて、下半ケースにランプユニット、光学ユニット及び冷却ユニットを組み込んだ状態を示す斜視図である。
【図６】ランプユニットの平面図である。
【図７】ランプユニットの断面図である。
【図８】左右非対称の開口パターンを有するランプユニットの一部破断斜視図である。
【図９】左右対称の開口パターンを有するランプユニットの一部破断斜視図である。
【図１０】開口パターンの異なる３種類のランプユニットの平面図である。
【図１１】冷却ユニット及び色合成装置の斜視図である。
【図１２】冷却ユニットの斜視図である。
【図１３】冷却ユニットの平面図である。
【図１４】冷却ユニットの分解斜視図である。
【図１５】冷却ユニットのハウジング本体の平面図である。
【図１６】冷却ユニットと光学ユニットの３つの偏光／液晶部との位置関係を示す平面図である。
【図１７】冷却ユニットの第２冷却ファンにおける断面図である。
【図１８】冷却ユニットの第３冷却ファンにおける断面図である。
【符号の説明】
(１) ケーシング
(11) 下半ケース
(12) 上半ケース
(13) 前面パネル
(14) 投射窓
(15) 排気孔
(２) 光学ユニット
(３) 色合成装置
(４) ランプユニット
(40) 排気ファン
(41) ハウジング
(44) 送風ファン
(45) 第１吸気窓
(46) 第２吸気窓
(47) ダクト
(５) ランプ
(50) 発光部
(51) リフレクター
(52) 空気導入口
(53) 透光プレート
(54) 空気導出口
(６) 冷却ユニット
(60) ハウジング
(63) 青用空気吹出し口
(64) 緑用空気吹出し口
(65) 赤用空気吹出し口
(69) ＰＢＳ用空気吹出し口
(66) 第１冷却ファン
(67) 第２冷却ファン
(68) 第３冷却ファン
(71) 第１背面吸気窓
(72) 第２背面吸気窓
(73) 第３背面吸気窓
(74) 下面吸気窓
(８) 流路網[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a projector device that guides light from a light source to an optical system to generate color image light, and projects the enlarged image onto a front screen.
[0002]
[Prior art]
This type of projector apparatus is configured by arranging a lamp serving as a light source and an optical system including a polarizing beam splitter, a polarizing plate, a liquid crystal panel, a projection lens, and the like inside the casing. Since heat is generated from the polarizing beam splitter, the liquid crystal panel, and the like, the entire optical system is cooled by installing a cooling fan inside the casing and flowing air inside the casing.
[0003]
[Problems to be solved by the invention]
However, in a projector device capable of projecting a high-luminance image, the amount of heat generated from the optical system increases, so it is necessary to rotate the cooling fan at a high speed to increase the amount of cooling air. There has been a problem that noise generated from the cooling fan increases.
SUMMARY OF THE INVENTION An object of the present invention is to provide a projector device that can sufficiently cool an optical system with a small air volume, and to reduce noise from a cooling fan.
[0004]
[Means for solving the problems]
In the projector device according to the present invention, a cooling unit (6) is provided along the optical system. The cooling unit (6) draws outside air from one or a plurality of intake windows for taking in outside air and the intake window. One or a plurality of cooling fans for taking in and discharging, a plurality of air outlets opening toward high temperature portions generated at a plurality of locations of the optical system, and a plurality of air outlets for discharging air discharged from the cooling fans A flow path network (8) for guiding the air flow to each of the flow path networks (8) according to the temperature of the high temperature portion. A plurality of flow paths are provided.
[0005]
In the projector device of the present invention, a plurality of air outlets are opened toward high temperature portions generated in a plurality of locations of the optical system, and a plurality of air outlets are provided from the outlets of one or a plurality of cooling fans. Since the flow channel network (8) is formed, the outside air taken in from the intake window is blown directly from each air outlet to the high temperature part of the optical system by the operation of the cooling fan. The high-temperature part is cooled intensively. However, the plurality of channels of the channel network (8) have a channel cross-sectional area and the like so that the amount of airflow to be blown from each air outlet to the high temperature part of the optical system is distributed according to the temperature of the high temperature part. Since the temperature is adjusted, the plurality of high temperature portions are cooled to a substantially uniform temperature.
Therefore, sufficient cooling can be performed with a smaller air volume than in the conventional case where the entire optical system is cooled simply by flowing the air in the casing.
[0006]
In a specific configuration, each air outlet of the cooling unit (6) is provided with an airflow guide wall for guiding the airflow direction of the airflow to be blown toward the center position of the high temperature portion of the optical system.
Thereby, the high temperature part of the optical system is cooled more efficiently.
[0007]
Further, in a specific configuration, the cooling unit (6) has the one or more cooling fans installed in the housing (60) and a partition wall for forming the channel network (8). The plurality of air outlets are formed on the surface of the housing (60) facing the optical system.
According to the specific configuration, the low temperature air flowing inside the housing (60) and the high temperature air existing outside the housing (60) are blocked by the wall surface of the housing (60) and mixed with each other. Therefore, the high temperature part of the optical system can be sufficiently cooled by the low temperature air.
[0008]
In a more specific configuration, the optical system includes a polarization beam splitter (24) into which light from a light source is incident, and a plurality of separation mirrors that separate light that has passed through the polarization beam splitter (24) into light of three primary colors. The three primary color light beams from the three primary colors that should pass through the three primary colors separated by the separation mirror, and the three primary color image lights from the three liquid crystal panels, respectively. A color synthesizing prism (30) for synthesizing the color image light; and a projection lens (20) for enlarging and projecting the color image light from the color synthesizing prism (30). The cooling unit (6) includes the plurality of airs. As an outlet, one air outlet (69) that blows out air to the polarizing beam splitter (24) and three air outlets (63) that blow out air to the three liquid crystal panels (32), (35), and (38), respectively. ) (64) (65).
According to this specific configuration, the four high temperature portions generated in the optical system, that is, the polarization beam splitter (24) and the three liquid crystal panels (32), (35), (38) are provided with four air outlets (69). ) (63) (64) (65) is cooled intensively by the air blown out.
[0009]
Here, since the blue liquid crystal panel (32) has the highest temperature, the flow path network (8) is adjusted so as to set the airflow to be blown to the blue liquid crystal panel (32) to the maximum. Yes.
As a result, the four high temperature parts are cooled to substantially the same temperature.
[0010]
【The invention's effect】
According to the projector device of the present invention, the optical system can be sufficiently cooled with a small air volume, so that noise from the cooling fan can be reduced.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention applied to a liquid crystal projector will be specifically described with reference to the drawings.
Overall configuration A liquid crystal projector according to the present invention comprises a flat casing (1) comprising a lower half case (11) and an upper half case (12) as shown in Fig. 1, and the front surface of the casing (1). The panel (13) is provided with a projection window (14) and a hot air exhaust hole (15) discharged from a built-in lamp unit.
Inside the casing (1), as shown in FIGS. 3 to 5, an optical unit (2) for generating color image light, a lamp unit (4) serving as a light source of the optical unit (2), and an optical unit A cooling unit (6) for cooling the unit (2) is provided.
[0012]
Optical unit ( 2 )
As shown in FIG. 2, the optical unit (2) converts the white light from the lamp unit (4) into the first integrator (21), the first mirror (22), the second integrator (23), and the polarization beam splitter (24). ) And then led to a blue two-color separation mirror (25), whereby blue light is separated. Further, the light passing through the blue dichroic separation mirror (25) is guided to the green dichroic separation mirror (27), thereby separating the green light.
The blue light separated by the blue two-color separation mirror (25) enters the color composition device (3) through the second mirror (26). The green light separated by the green two-color separation mirror (27) is incident on the color composition device (3), and the red light is incident on the color composition device (3) through the third mirror (28).
[0013]
The blue light incident on the color synthesizer (3) passes through the blue incident side polarizing plate (31), the blue liquid crystal panel (32), and the blue outgoing side polarizing plate (33) of the color synthesizer (3). Then, it is guided to the color synthesis prism (30). The green light incident on the color synthesizer (3) is incident on the green incident side polarizing plate (34), the green liquid crystal panel (35), and the green outgoing side polarizing plate (36). Then, it is guided to the color synthesis prism (30). Further, the red light incident on the color synthesizer (3) is reflected on the red incident side polarizing plate (37), the red liquid crystal panel (38), and the red outgoing side polarizing plate (39) of the color synthesizer (3). Then, it is guided to the color synthesis prism (30).
The three colors of image light guided to the color combining prism (30) are combined by the color combining prism (30), and the color image light obtained thereby is enlarged and projected onto the front screen through the projection lens (20). The
[0014]
Lamp unit ( 4 )
As shown in FIG. 7, the lamp unit (4) is provided with an ultra-high pressure mercury lamp (5) in a housing (41), and an exhaust fan (40) is installed at a rear position of the lamp (5). Has been.
The ultra-high pressure mercury lamp (5) includes a reflector (51), a light emitting part (50) provided at a focal position of the reflector (51), and a translucent plate (53) covering the opening of the reflector (51). In addition, an elongated air introduction port (52) extending in the width direction of the translucent plate (53) is opened at the lower end of the translucent plate (53) between the opening edge of the reflector (51). An elongated air outlet port (54) extending in the width direction of the light transmissive plate (53) is provided at the upper end of the light transmissive plate (53) between the opening edge of the reflector (51). Each of the air inlet (52) and the air outlet (54) has an opening shape inclined toward the light emitting part (50) of the lamp (5).
[0015]
On the upper wall of the housing (41), as shown in FIG. 6, one elongated first intake window (45) extending in the front-rear direction at one end in the width direction orthogonal to the optical axis (front-rear direction) of the lamp. ) And a plurality of elongated second intake windows (46) extending in the front-rear direction are opened at the center in the width direction. In addition, on the upper wall of the housing (41), one third air intake window (49) extending in the width direction is provided at the end in the light emitting direction.
[0016]
A fan case (42) is connected to the housing (41) through a duct (47) at a portion facing the air introduction port (52). Inside the fan case (42), a blower fan is connected. (44) is housed. The blower fan (44) has a discharge port (48) that opens toward the inside of the duct (47), and an intake port (43) that opens downward, and the intake port (43) As shown in FIG. 4, it is connected to a plurality of intake holes (16) opened in the bottom wall of the lower half case (11).
[0017]
When the power is supplied to the liquid crystal projector, the exhaust fan (40) and the blower fan (44) start rotating.
By rotating the exhaust fan (40), air is sucked from the first intake window (45), the second intake window (46) and the third intake window (49) of the housing (41), and the lamp (5) An airflow flowing toward the exhaust fan (40) is generated around the lamp, and the outer peripheral surface of the lamp (5) is cooled by the airflow.
[0018]
Here, since the asymmetrical opening pattern is given to the upper wall of the housing (41) by the first intake window (45), the lamp (5) is provided around the reflector (51) of the lamp (5). ), The airflow toward the exhaust fan (40) is generated while rotating in one direction around the optical axis.
[0019]
For example, as shown in FIG. 8, when the exhaust fan (40) rotates in the clockwise direction, the first intake window (45) and the third intake window are located on the ceiling wall of the housing (41b) so as to be biased to the right as a whole. (49) was established, and an asymmetrical opening pattern was provided as a whole, so that an airflow rotating clockwise around the lamp (5) was generated, and the airflow was exhausted while maintaining its rotation. It will pass through the fan (40).
As a result, uniform heat transfer is performed over the entire outer peripheral surface of the lamp (5), and the lamp (5) can be sufficiently cooled with a smaller air volume.
[0020]
On the other hand, as shown in FIG. 9, when a plurality of second intake windows (46) are opened symmetrically on the ceiling wall of the housing (41a), almost no airflow rotates around the lamp (5). Instead, a biased air flow is generated on a part of the outer peripheral surface of the lamp (5).
As a result, heat transfer on the outer peripheral surface of the lamp (5) becomes insufficient, and the temperature distribution is also biased.
[0021]
FIG. 10 (a) shows a housing (41a) in which a plurality of second intake windows (46) are opened at the center of the ceiling wall, and FIG. 10 (b) extends in the width direction at the end of the ceiling wall. The housing (41b) in which the 3rd intake window (49) and the 1st intake window (45) extended in the front-back direction of the ceiling wall are shown is shown, The figure (c) shows the above-mentioned 1st intake window ( 45), the housing (41c) in which all of the second intake window (46) and the third intake window (49) are opened, and Table 1 shows these housings (41a) (41b) (41c). The result of having measured the temperature distribution of the lamp | ramp outer peripheral surface about the provided three types of lamp units is represented.
[0022]
[Table 1]

[0023]
As is clear from the results in Table 1, the maximum temperature is kept lower in the housings (41b) and (41c) having the asymmetrical opening pattern as a whole than in the housing (41a) having the symmetrical opening pattern. The difference between the maximum temperature and the minimum temperature is kept small, which supports the effect of the housing having a left-right asymmetric opening pattern.
[0024]
Further, in the lamp unit (4) shown in FIGS. 6 and 7, the blower fan (44) rotates, so that the suction port (16) of the lower half case (11) to the intake port (16) of the blower fan (44). 43), air is sucked in through the discharge port (48), and the discharged air passes through the duct (47) and is reflected from the air inlet (52) of the lamp (5) to the reflector (51). It is introduced inside. Here, since the air introduction port (52) is opened toward the light emitting unit (50), the air introduced inside the reflector (51) is blown directly onto the light emitting unit (50). Further, the air flow is guided along the concave curved surface of the reflector (51), thereby generating a swirling flow surrounding the light emitting section (50).
[0025]
As a result, the air introduced into the inside of the reflector (51) exchanges heat with the light emitting part (50) of the lamp (5) with a high heat transfer coefficient, and after the forced light cooling of the light emitting part (50), Derived from the outlet (54) to the outside of the reflector (51).
The air led out from the air outlet (54) to the outside of the reflector (51) joins the airflow flowing around the reflector (51) and flows toward the exhaust fan (40). The airflow that has passed through the exhaust fan (40) is discharged forward from the exhaust hole (15) of the front panel (13) shown in FIG.
[0026]
As described above, the light emitting part (50) having the highest temperature in the lamp (5) is efficiently cooled, so that the air volume of the exhaust fan (40) and the blower fan (44) can be set small. Thus, noise generated from these fans (40) and (44) can be greatly reduced.
[0027]
In the liquid crystal projector of the present invention, the optical system in which the emission direction of the white light from the lamp unit (4) and the projection direction of the image light from the optical unit (2) are set in opposite directions different from each other by 180 degrees. As a result, the projection panel (14) and the exhaust hole (15) are added to the front panel (13) of the casing (1), so that the noise generated from the fan built in the lamp unit (4) is The light is emitted in the light projection direction toward the screen. This makes it difficult for the viewer from reaching the rear position away from the screen than the liquid crystal projector to receive noise from the fan.
[0028]
Cooling unit ( 6 )
As shown in FIGS. 3 and 4, a cooling unit (6) is disposed below the optical unit (2) in order to cool the optical unit (2).
The cooling unit (6) includes a flat housing (60) as shown in FIGS. 11 and 12, and four air outlets (63) (64) (65) provided on the surface of the housing (60). Air is blown from (69) toward the four heat generating portions of the upper optical unit (2).
[0029]
Of the four air outlets (63), (64), (65) and (69), the three air outlets (63), (64) and (65) shown in FIG. 16 each constitute a color composition device (3). The blue incident side polarizing plate (31), the blue liquid crystal panel (32) and the blue emitting side polarizing plate (33) open to the blue air outlet, and the green incident side polarizing plate (34). , The green air outlet opening toward the green liquid crystal panel (35) and the green output side polarizing plate (36), the red incident side polarizing plate (37), the red liquid crystal panel (38) and red This is a red air outlet that opens toward the output-side polarizing plate (39).
In addition, the remaining one air outlet (69) shown in FIG. 12 serves as an air outlet for a polarizing beam splitter (hereinafter referred to as PBS) that opens toward the polarizing beam splitter (24) shown in FIG.
[0030]
The housing (60) of the cooling unit (6) is composed of a main body (61) and a lid (62) as shown in FIG. 14, and the above-mentioned four air outlets (63) (64) are formed in the lid (62). ) (65) (69) has been established. The housing main body (61) is provided with three cooling fans (66), (67) and (68) arranged in a row, and discharges from these cooling fans (66), (67) and (68). The air is divided or merged through a flow path network (8) formed by a plurality of partition walls to form four flows with appropriate flow rates as described later, and four air outlets (63) (64). ) (65) (69)
[0031]
That is, among the incident side polarizing plate, the liquid crystal panel, and the outgoing side polarizing plate (hereinafter referred to as the polarization / liquid crystal unit as one set) constituting each color composing device (3), Since the amount of heat generated in the liquid crystal unit is the largest, the air flow discharged from each cooling fan (66), (67), and (68) is divided into two, and one of the divided air flows is used for green polarized light / liquid crystal unit and red The polarization / liquid crystal unit and the cooling of the PBS are allotted, and the other divided air flow is allotted to the blue polarization / liquid crystal unit.
[0032]
Therefore, as shown in FIG. 14 and FIG. 15, the flow path network (8) has a flow path from the first cooling fan (66) to the blue air outlet (63) and the PBS air outlet (69). The flow path from the second cooling fan (67) to the blue air outlet (63) and the green air outlet (64), and the third cooling fan (68) to the blue air outlet (63) and red And a flow path to the air outlet (65).
[0033]
A guide vane (89) is attached to the air outlet (69) for the PBS, and the airflow from the first cooling fan (66) is sent to the high temperature part of the polarizing beam splitter (24), that is, the central part of the light exit surface. Spray with.
For cooling the blue polarized light / liquid crystal unit, green polarized light / liquid crystal unit, and red polarized light / liquid crystal unit, in order to appropriately adjust the air volume and the wind direction on the incident side and the outgoing side, an air flow guide is used as described later. Form a surface.
[0034]
That is, as shown in FIG. 13, the first to fourth partition walls (81), (82), (83), and (84) are installed in the blue air outlet (63) to provide the first cooling fan (66). The first air blowing part (91) to blow the airflow from the second air blowing part (92) to blow the airflow from the second cooling fan (67) and the airflow from the third cooling fan (68) A third air blowing portion (93) to be blown is formed. Also, air flow guide surfaces (not shown) are formed on the first partition wall (81) and the third partition wall (83), respectively, from the second cooling fan (67) and the third cooling fan (68). The airflow direction and the airflow to the incident side and the emission side of the polarization / liquid crystal unit are adjusted.
At the green air outlet (64), guide vanes (85) are installed, and two air outlets (95) (96) are formed on both sides of the guide vane (85). / Adjusts the airflow direction and airflow to the entrance and exit sides of the liquid crystal unit.
Further, a fifth partition wall (86) and guide vanes (87) are installed at the red air outlet (65) to form two air outlets (97) and (98), and a third cooling fan ( 68) to adjust the airflow direction and the airflow from the incident / exit side of the red polarization / liquid crystal unit.
[0035]
FIG. 16 shows the positional relationship between the blue air outlet (63) and the blue polarization / liquid crystal unit, the positional relationship between the green air outlet (64) and the green polarization / liquid crystal unit, and the red air outlet ( 65) and the red polarized light / liquid crystal part positional relationship, and the air flow adjusted in the air volume and direction as described above is blown to the incident side and the outgoing side of each polarized light / liquid crystal part for effective cooling. Is done.
[0036]
The first cooling fan 66, the second cooling fan 67, and the third cooling fan 68 shown in FIG. 14 are all single-suction sirocco fans having a suction port on one side of the casing. The first cooling fan (66) and the second cooling fan (67) are installed in the housing body (61) with their suction ports (66a) (67a) facing upward, and the discharge ports ( 66b) (67b) face the inlet of the channel network (8). The third cooling fan (68) is installed in the housing body (61) with the suction port facing downward, and the discharge port (68b) faces the inlet of the channel network (8). .
[0037]
As shown in FIG. 14, the rear surface of the housing body 61 has a first rear intake window 71 corresponding to the first cooling fan 66, the second cooling fan 67, and the third cooling fan 68. ), A second back intake window (72) and a third back intake window (73) are opened. Further, as shown in FIG. 18, a lower intake window (74) is formed on the bottom surface of the housing body (61) corresponding to the third cooling fan (68).
[0038]
FIG. 17 shows the cross-sectional structure of the cooling unit (6) at the position where the second cooling fan (67) is installed, and the cross-sectional structure at the position where the first cooling fan (66) is installed is the same. FIG. 18 shows a cross-sectional structure of the cooling unit (6) at the position where the third cooling fan (68) is installed.
Above the first cooling fan (66) and the second cooling fan (67), a space S as large as possible is provided between the upper wall of the lid (62). As indicated by the arrows, the air sucked from the rear intake windows (71) and (72) of the housing body (61) passes through the space and the suction ports (66a) of the first and second cooling fans (66) and (67). (67a) Further, a space S as large as possible is provided below the third cooling fan (68) between the bottom wall of the housing body (61), and as indicated by an arrow in FIG. Air sucked from the rear intake window (73) and the lower intake window (74) of the housing body (61) is sucked into the intake port (68a) of the third cooling fan (68) through the space.
[0039]
The three rear intake windows (71), (72), (73) of the housing body (61) are connected to the intake holes (not shown) formed in the rear surface of the casing (1), and the lower surface of the housing body (61). The intake window (74) is connected to an intake hole (not shown) formed in the bottom wall of the casing (1).
[0040]
As described above, the suction ports (66a), (67a) and (68a) of the cooling fans (66), (67) and (68) are all connected to the outside of the casing (1). Since the wall surface of the housing (60) is a partition and there is no connection, only the low-temperature air outside the casing (1) is sucked into each cooling fan (66), (67), (68), and the casing (1 ) Hot air inside is not inhaled.
As a result, low-temperature air is blown out toward the optical unit (2), and the optical unit (2) can be sufficiently cooled with a small amount of air.
[0041]
Also, a single suction sirocco fan is adopted as each cooling fan (66), (67), (68) of the cooling unit (6), and the side of the fan and the housing where the suction ports (66a) (67a) (68a) are opened (60) Since a sufficiently large space S is provided between the wall surface, the flow resistance of the air sucked into the fan via the space is low. As a result, a low output sirocco fan having a low rotation speed can be adopted as each cooling fan.
[0042]
According to the liquid crystal projector of the present invention, the cooling system for cooling the lamp (5) and the optical unit (2) can be effectively cooled with a smaller air volume than before. It is possible to operate the fan for feeding the air at a low rotational speed, and this can significantly reduce the noise generated from the fan.
[Brief description of the drawings]
FIG. 1 is a perspective view of a liquid crystal projector according to the present invention.
FIG. 2 is a diagram illustrating a configuration of an optical system of a lamp unit and an optical unit provided in the liquid crystal projector.
FIG. 3 is an exploded perspective view of the liquid crystal projector.
FIG. 4 is a perspective view showing a state in which the lamp unit, the optical unit, and the cooling unit are removed from the lower half case in the liquid crystal projector.
FIG. 5 is a perspective view showing a state in which a lamp unit, an optical unit, and a cooling unit are incorporated in a lower half case in the liquid crystal projector.
FIG. 6 is a plan view of the lamp unit.
FIG. 7 is a sectional view of the lamp unit.
FIG. 8 is a partially cutaway perspective view of a lamp unit having a left-right asymmetric opening pattern.
FIG. 9 is a partially broken perspective view of a lamp unit having a symmetrical opening pattern.
FIG. 10 is a plan view of three types of lamp units having different opening patterns.
FIG. 11 is a perspective view of a cooling unit and a color composition device.
FIG. 12 is a perspective view of a cooling unit.
FIG. 13 is a plan view of the cooling unit.
FIG. 14 is an exploded perspective view of the cooling unit.
FIG. 15 is a plan view of a housing main body of the cooling unit.
FIG. 16 is a plan view showing the positional relationship between the cooling unit and the three polarization / liquid crystal units of the optical unit.
FIG. 17 is a cross-sectional view of a second cooling fan of the cooling unit.
FIG. 18 is a cross-sectional view of a third cooling fan of the cooling unit.
[Explanation of symbols]
(1) Casing
(11) Lower case
(12) Upper half case
(13) Front panel
(14) Projection window
(15) Exhaust hole
(2) Optical unit
(3) Color composition device
(4) Lamp unit
(40) Exhaust fan
(41) Housing
(44) Blower fan
(45) First intake window
(46) Second intake window
(47) Duct
(5) Lamp
(50) Light emitter
(51) Reflector
(52) Air inlet
(53) Translucent plate
(54) Air outlet
(6) Cooling unit
(60) Housing
(63) Blue air outlet
(64) Green air outlet
(65) Air outlet for red
(69) PBS air outlet
(66) First cooling fan
(67) Second cooling fan
(68) Third cooling fan
(71) First rear intake window
(72) Second rear intake window
(73) Third rear intake window
(74) Bottom intake window
(8) Channel network

Claims (4)

In a projector device that guides light from a light source to an optical system, separates the light into three primary colors, synthesizes the light of the three primary colors into color image light, and projects forward from a projection lens, along the optical system cooling unit is deployed, the cooling unit is generated and N inlet window for drawing outside air, and N of the cooling fan that discharges each incorporating the outside air from the intake window, the M locations of the optical system and M air blowout port opening toward the high temperature portion, in a projector apparatus comprising a flow path network for guiding air discharged from the N of the cooling fan to the M air blowing mouth,
The flow path network divides the air discharged from the N cooling fans into L flow paths and joins the L flow paths to connect the M air outlets to the M flow outlets. A projector apparatus comprising: a partition wall that forms a path, wherein the partition wall distributes the amount of airflow to be blown from the M air outlets according to the temperature of the high temperature portion. (However, N, M and L are integers of 2 or more)   The projector device according to claim 1, wherein each air outlet of the cooling unit is provided with an airflow guide wall for guiding the airflow direction of the airflow to be blown toward the center position of the high temperature portion of the optical system. Optical system includes a polarizing beam splitter the light to be incident from a light source, a plurality of separation mirror which separates the light passing through the polarizing beam splitter to the three primary colors of light, the three primary colors of light separated by the separation mirror There the three liquid crystal panels for three primary colors should pass through each color synthesizing prism for synthesizing the image light of the three primary colors from the three liquid crystal panels in the color image light, color image light from the color combining prism comprising a projection lens for enlarging and projecting the said cooling unit, a plurality of air outlets, and one air outlet for blowing air toward the polarization beam splitter, toward the three liquid crystal panels of the air The projector apparatus in any one of Claim 1 thru | or 2 with which the three air blowing outlets which blow off are opened. The projector device according to claim 3 , wherein the flow path network is adjusted so as to set the air volume of the air flow to be blown toward the blue liquid crystal panel to the maximum.

Images