JP2007316334A

JP2007316334A - Projector

Info

Publication number: JP2007316334A
Application number: JP2006145784A
Authority: JP
Inventors: Hirofumi Okabe; 浩文岡部
Original assignee: Funai Electric Co Ltd
Current assignee: Funai Electric Co Ltd
Priority date: 2006-05-25
Filing date: 2006-05-25
Publication date: 2007-12-06

Abstract

PROBLEM TO BE SOLVED: To reduce the size and cost of a projector used for expanded projection of an image onto a screen, by preventing a current of cooling air heated as a result of cooling a light source section from being exhausted directly from a housing, thereby increasing the degree of freedom in the position of an exhaust port and arrangement of each component composing the projector. SOLUTION: The projector includes: a DMD (digital micro mirror device) 17 for forming images; a light source 11 for illuminating the DMD 17, a reflecting plate 12; a color wheel 13; an optical tunnel 15; a projection lens 18; a housing 2 accommodating each member, a blower fan 19 for cooling a light source 11 and reflecting plate 12 in the housing 2; and a cooling fan 3 for cooling mainly the control section 20. The light source 11 and reflecting plate 12 are cooled with a first current of cooling air 54 generated by the blower fan 19. A current of mixed air 55, which is a mixture of the first current of cooling air 54 used for cooling the light source 11 and reflecting plate 12 and part 53 of the second current of cooling air generated by the cooling fan 3, is exhausted from the exhaust port 2C. COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、動画や静止画などの画像を前方のスクリーンに拡大投影するプロジェクタに関する。 The present invention relates to a projector that enlarges and projects an image such as a moving image or a still image on a front screen.

動画や静止画などの画像を前方のスクリーンに拡大投影するプロジェクタでは、光源として高輝度の放電ランプや高輝度ＬＥＤなどを用いているため、光源から大量の熱が発生される。また、光源からの熱に曝される反射板などの集光部材や、ＤＭＤ（デジタルマイクロミラーデバイス）あるいは液晶表示素子などの画像形成素子も高温になる。そのため、プロジェクタにおいては、電源や制御回路などを冷却するための冷却ファンに加えて、光源、集光部材及び画像形成素子などを集中的に冷却するためのブロアファンが設けられている。 In a projector that enlarges and projects an image such as a moving image or a still image on a front screen, a high-intensity discharge lamp, a high-intensity LED, or the like is used as a light source, and thus a large amount of heat is generated from the light source. In addition, a condensing member such as a reflection plate exposed to heat from a light source, and an image forming element such as a DMD (digital micromirror device) or a liquid crystal display element are also heated. Therefore, in the projector, in addition to the cooling fan for cooling the power supply, the control circuit, and the like, a blower fan for intensive cooling of the light source, the light collecting member, the image forming element, and the like is provided.

冷却ファンは、電子機器の電源部など冷却を必要とする部分に用いられている汎用品であって、モータの軸に直接ファンを取り付けただけの比較的簡単な構成である。これに対して、ブロアファンは、上記モータ及びファンの他に、所定方向に冷却風を噴出させるためのダクトを備えている。そして、ブロアファンにより発生された冷却風は、光源、集光部材及び画像形成素子などを冷却するために、ダクトにより所定の方向に噴出され、これらを冷却した後の熱せられた冷却風がハウジングの排気口から排気される。そのうち、最も温度の高い光源と、その次に温度の高い集光部材を冷却した後の冷却風は、非常に高温であるため、排気口の近傍を含むハウジングの温度が非常に高くなる。そのため、ハウジングの材料として高温に耐えうる樹脂を用いなければならず、あるいは、ハウジングの内側にアルミテープなどを貼付するなどの耐熱処理を施さなければならず、コストアップの原因となる。さらに、ユーザが誤ってハウジングの高温部に触れないようにするため、排気口の位置や冷却風の流路などが制限される。そのため、プロジェクタを構成する各部品の配置が制限され、プロジェクタの小型軽量化を妨げる要因となる。 The cooling fan is a general-purpose product that is used in parts that require cooling, such as a power supply unit of an electronic device, and has a relatively simple configuration in which the fan is directly attached to the motor shaft. In contrast, the blower fan includes a duct for ejecting cooling air in a predetermined direction in addition to the motor and the fan. Then, the cooling air generated by the blower fan is ejected in a predetermined direction by the duct in order to cool the light source, the light collecting member, the image forming element, and the like. It is exhausted from the exhaust port. Among them, since the cooling air after cooling the light source having the highest temperature and the light collecting member having the next highest temperature is very hot, the temperature of the housing including the vicinity of the exhaust port becomes very high. For this reason, it is necessary to use a resin that can withstand high temperatures as the material of the housing, or heat treatment such as attaching an aluminum tape or the like to the inside of the housing, which increases costs. Furthermore, in order to prevent the user from accidentally touching the high temperature part of the housing, the position of the exhaust port, the flow path of the cooling air, and the like are limited. For this reason, the arrangement of the parts constituting the projector is limited, which becomes a factor that hinders the reduction in size and weight of the projector.

なお、特許文献１では、プロジェクタの光源部を効率良く冷却するために、光源部の直後に冷却ファンを配置すると共に、反射板に開口を設け、冷却ファンにより発生された冷却風の一部を直接光源及び反射板の内面側に誘導し、残りを反射板の背面側に誘導している。しかしながら、このような構成では、光源部を冷却した後の熱せられた冷却風がそのままハウジングの外部に排気されるという問題点は解決されていない。また、冷却ファン自体が光源からの出射された光の一部に直接曝されることになり、冷却ファン自体も高温になる。さらに、冷却ファンの隙間から光が後方に漏れ、光源の発光効率が低下する。
特開２００５−６２３７５号公報 In Patent Document 1, in order to efficiently cool the light source unit of the projector, a cooling fan is disposed immediately after the light source unit, and an opening is provided in the reflector so that a part of the cooling air generated by the cooling fan is removed. The light source is guided directly to the inner surface side of the light source and the reflecting plate, and the rest is guided to the rear surface side of the reflecting plate. However, such a configuration does not solve the problem that the heated cooling air after cooling the light source unit is exhausted to the outside of the housing as it is. Further, the cooling fan itself is directly exposed to a part of the light emitted from the light source, and the cooling fan itself becomes high temperature. Furthermore, light leaks backward from the gap of the cooling fan, and the light emission efficiency of the light source decreases.
JP 2005-62375 A

本発明は、上記従来例の問題を解決するためになされたものであり、光源部を冷却した後の熱せられた冷却風が直接ハウジングの排気口から排気されることがなく、それによって排気口の位置やプロジェクタを構成する各部品の配置の自由度を高くし、小型軽量化及び低コスト化を可能とするプロジェクタを提供することを目的とする。 The present invention has been made to solve the above-described problems of the conventional example, and the heated cooling air after cooling the light source unit is not directly exhausted from the exhaust port of the housing, thereby the exhaust port. It is an object of the present invention to provide a projector that can increase the degree of freedom of the position of each of the components constituting the projector and the size, weight, and cost of the projector.

上記目的を達成するために請求項１の発明は、光源と、光源から出射された光の光路上に設けられ、三原色に相当するカラーフィルタが所定角度ピッチで形成され、一定速度で回転するカラーホイールと、前記光源から出射された光を前記カラーホイール上の一部に集光するための、少なくとも反射板を備えた集光部材と、前記カラーホイールを透過した光束の光路上に設けられ、二次元的に配列された微小ミラーの集合体であって、外部から入力された映像信号に応じて前記微小ミラーの角度を変化させ、前記カラーホイールを透過した光束を所定方向と前記所定方向以外の方向に反射させるＤＭＤ（デジタルマイクロミラーデバイス）と、前記ＤＭＤに対して前記所定方向に配置され、前記ＤＭＤにより反射された光束をスクリーン上に投影する投影レンズと、前記映像信号を用いて前記ＤＭＤを駆動するＤＭＤ駆動回路と、プロジェクタ全体を制御する全体制御回路と、前記光源を駆動する光源駆動回路と、前記ＤＭＤ駆動回路、前記全体制御回路及び前記光源駆動回路を含むプロジェクタ各部に電力を供給するための電源回路と、前記光源、前記集光部材及び前記ＤＭＤを集中的に冷却するための第１冷却風を発生させるブロアファンと、少なくとも前記電源回路を冷却するための第２冷却風を発生させる冷却ファンと、前記各部材を収納するハウジングを備えたプロジェクタにおいて、
前記ハウジングは、前記投影レンズによる投影方向において、前方に配置された第１収納部と、後方に配置された第２収納部を有し、
前記光源、前記カラーホイール、前記集光部材、前記ＤＭＤ、前記投影レンズ及び前記ブロアファンは、前記第１収納部に収納され、
前記ＤＭＤ駆動回路、前記全体制御回路、前記光源駆動回路及び前記電源回路は、前記第２収納部に収納され、
前記冷却ファンは、前記第１収納部と前記第２収納部に跨るように配置されており、
前記ブロアファンは、第１冷却風を前記光源及び前記集光部材側に誘導するための第１ダクトを有し、
前記第１収納部には、前記冷却ファンにより発生された第２冷却風の一部を、前記光源及び前記集光部材には直接誘導せず、前記ブロアファンにより発生された第１冷却風の流路における前記光源及び前記集光部材の下流側に誘導するための第２ダクトと、前記光源及び前記集光部材を冷却した後の熱せられた第１冷却風と前記第２ダクトによって誘導された第２冷却風の一部とが混合された混合風を前記投影レンズの下部を通って前記ハウジングの排気口に誘導する第３ダクトがさらに設けられており、
それによって、前記光源及び前記集光部材を冷却した後の熱せられた第１冷却風と第２冷却風の一部が混合されて温度が低下された混合風を排気することにより、排気口近傍を含む前記ハウジングの温度上昇を抑制したことを特徴とする。 In order to achieve the above object, the invention of claim 1 is a color which is provided on the optical path of the light source and the light emitted from the light source, and color filters corresponding to the three primary colors are formed at a predetermined angular pitch and rotated at a constant speed. A light collecting member having at least a reflecting plate for condensing light emitted from the light source onto a part of the color wheel, and an optical path of a light beam transmitted through the color wheel; An assembly of two-dimensionally arranged micromirrors that changes the angle of the micromirrors according to a video signal input from the outside, and transmits the light beam transmitted through the color wheel in a predetermined direction and a direction other than the predetermined direction DMD (digital micromirror device) that reflects in the direction of the light beam, and a light beam that is disposed in the predetermined direction with respect to the DMD and reflected by the DMD on the screen A projection lens for shadowing, a DMD driving circuit for driving the DMD using the video signal, an overall control circuit for controlling the entire projector, a light source driving circuit for driving the light source, the DMD driving circuit, and the overall control A power supply circuit for supplying power to each part of the projector including a circuit and the light source drive circuit, and a blower fan for generating a first cooling air for intensively cooling the light source, the condensing member, and the DMD, In a projector including a cooling fan that generates at least a second cooling air for cooling the power supply circuit, and a housing that houses the members,
The housing has a first storage portion disposed in the front and a second storage portion disposed in the rear in the projection direction of the projection lens,
The light source, the color wheel, the condensing member, the DMD, the projection lens, and the blower fan are stored in the first storage unit,
The DMD drive circuit, the overall control circuit, the light source drive circuit, and the power supply circuit are housed in the second housing part,
The cooling fan is disposed so as to straddle the first storage part and the second storage part,
The blower fan has a first duct for guiding the first cooling air to the light source and the light collecting member side,
In the first storage part, a part of the second cooling air generated by the cooling fan is not directly guided to the light source and the light collecting member, and the first cooling air generated by the blower fan is not guided. A second duct for guiding the light source and the light collecting member downstream of the light source and the light collecting member in the flow path; and the heated first cooling air after cooling the light source and the light collecting member and the second duct. A third duct for guiding the mixed air mixed with a part of the second cooling air to the exhaust port of the housing through the lower part of the projection lens,
Accordingly, the heated first cooling air after cooling the light source and the light collecting member and a part of the second cooling air are mixed to exhaust the mixed air whose temperature has been reduced, thereby near the exhaust port. The temperature rise of the said housing containing this was suppressed, It is characterized by the above-mentioned.

請求項２の発明は、画像を形成する画像形成素子と、画像形成素子を照明する光源部と、画像形成素子により形成された画像を前方に拡大投影する投影レンズと、前記画像形成素子及び前記光源を駆動するための駆動回路が実装された回路基板と、前記各部材を収納するハウジングと、前記ハウジングの外部から空気を前記ハウジング内に吸引し、前記各部材を冷却する冷却手段を備えたプロジェクタにおいて、前記冷却手段は、少なくとも２つの第１ファン及び第２ファンを有し、前記第１ファンにより発生された第１冷却風で前記光源部を冷却し、前記第１ファンで発生され、前記光源部を冷却した第１冷却風と、前記第２ファンで発生された第２冷却風の少なくとも一部を混合した混合風を排気することを特徴とする。 The invention according to claim 2 is an image forming element that forms an image, a light source unit that illuminates the image forming element, a projection lens that enlarges and projects an image formed by the image forming element, the image forming element, and the A circuit board on which a drive circuit for driving a light source is mounted, a housing that houses each of the members, and a cooling unit that sucks air into the housing from the outside of the housing and cools the members. In the projector, the cooling means includes at least two first fans and a second fan, cools the light source unit with a first cooling air generated by the first fan, and is generated by the first fan. A mixed air obtained by mixing at least a part of the first cooling air that has cooled the light source unit and the second cooling air that is generated by the second fan is exhausted.

請求項３の発明は、請求項２に記載のプロジェクタにおいて、前記第１収納部は、前記投影レンズによる投影方向において、前記ハウジングの前方に配置され、前記第２収納部は前記ハウジングの後方に配置され、前記画像形成素子、前記光源部、前記投影レンズ及び前記第１ファンは、前記第１収納部に設けられ、前記第２ファンは前記第１収納部と前記第２収納部に跨るように設けられており、前記第１収納部には、前記第２ファンにより発生された第２冷却風の少なくとも一部を前記光源部には直接誘導せず、前記第１ファンにより発生された第１冷却風の流路の前記光源部よりも下流側に誘導するためのダクトが設けられていることを特徴とする。 According to a third aspect of the present invention, in the projector according to the second aspect, the first storage portion is disposed in front of the housing in the projection direction by the projection lens, and the second storage portion is disposed behind the housing. The image forming element, the light source unit, the projection lens, and the first fan are provided in the first storage unit, and the second fan straddles the first storage unit and the second storage unit. In the first storage part, at least a part of the second cooling air generated by the second fan is not directly guided to the light source part, and the first cooling part is generated by the first fan. A duct for guiding the cooling air flow path to the downstream side of the light source part is provided.

請求項１の発明によれば、最も温度の高い光源及びその次に温度の高い集光部材を冷却した後の熱せられた第１冷却風は、直接ハウジングの排気口から排気されることはなく、この熱せられた第１冷却風に比べて遙かに温度に低い第２冷却風の一部と混合された後、ハウジングの排気口から排気される。そのため、排気口近傍を含むハウジングの温度上昇が抑制されるので、ハウジングの材料として、耐熱性に低い材料を用いることが可能になる。あるいは、ハウジングの内側にアルミテープを貼付するなどの耐熱処理が不要になる。その結果、プロジェクタのコストダウンが可能になる。また、仮にユーザがハウジングの排気口近傍に触れたとしても危険ではないので、排気口の位置を自由に設定でき、プロジェクタを構成する各部品の配置の自由度が高くなるので、プロジェクタの小型軽量化が可能になる。 According to the first aspect of the present invention, the heated first cooling air after cooling the light source having the highest temperature and the light collecting member having the next highest temperature is not directly exhausted from the exhaust port of the housing. After being mixed with a part of the second cooling air that is much lower in temperature than the heated first cooling air, the air is exhausted from the exhaust port of the housing. Therefore, since the temperature rise of the housing including the vicinity of the exhaust port is suppressed, a material having low heat resistance can be used as the housing material. Or heat-resistant processing, such as sticking an aluminum tape inside a housing, becomes unnecessary. As a result, the cost of the projector can be reduced. In addition, even if the user touches the vicinity of the exhaust port of the housing, it is not dangerous. Therefore, the position of the exhaust port can be set freely, and the degree of freedom of arrangement of each component constituting the projector is increased. Can be realized.

また、従来の構成と比較して、ハウジングに、冷却ファンにより発生された第２冷却風の一部を、第１冷却風の流路における光源及び集光部材の下流側に誘導するための第２ダクトと、熱せられた第１冷却風と第２冷却風の一部とが混合された混合風をハウジングの排気口に誘導する第３ダクトをさらに設けただけであるので、ダクトを製造するための金型が若干複雑になる程度であって、ハウジングの製造コストは従来のものと差はない。さらに、第３ダクトは投影レンズの下部の空間に設けられているので、第３ダクトを設けてもハウジングの大きさは従来のものとほとんど同じである。むしろ、上記のように、排気口の位置及びプロジェクタを構成する各部品の配置の自由度が高くなるので、プロジェクタの小型軽量化が可能になる。 In addition, compared with the conventional configuration, a second cooling air generated by the cooling fan in the housing is guided to the downstream side of the light source and the condensing member in the flow path of the first cooling air. The duct is manufactured because only the second duct and the third duct for guiding the mixed air in which the heated first cooling air and a part of the second cooling air are mixed to the exhaust port of the housing are further provided. Therefore, the manufacturing cost of the housing is not different from the conventional one. Furthermore, since the third duct is provided in the space below the projection lens, the size of the housing is almost the same as the conventional one even if the third duct is provided. Rather, as described above, the degree of freedom of the position of the exhaust port and the arrangement of the components constituting the projector is increased, and thus the projector can be reduced in size and weight.

さらに、ハウジングを、投影レンズによる投影方向、すなわちハウジングの前後方向において、前方に配置された第１収納部と後方に配置された第２収納部に２分割し、高温となる光源、集光部材、ＤＭＤなどを第１収納部に収納しているので、第２収納部に収納されたＤＭＤ駆動回路、全体制御回路、光源駆動回路及び電源回路などを光源の高熱から遮断することが可能となる。 Furthermore, the housing is divided into two parts, a first storage part disposed in the front and a second storage part disposed in the rear in the projection direction by the projection lens, that is, the front-rear direction of the housing, and the light source and the light collecting member that become high in temperature Since the DMD and the like are stored in the first storage unit, the DMD drive circuit, the overall control circuit, the light source drive circuit, the power supply circuit, and the like stored in the second storage unit can be blocked from the high heat of the light source. .

請求項２の発明によれば、第１ファンで発生され、光源部を冷却した第１冷却風と、第２ファンで発生された第２冷却風の少なくとも一部を混合した混合風を排気するので、光源部を冷却した第１冷却風を直接排気する場合に比べて、排気温度を低くすることができる。その結果、排気口近傍を含むハウジングの温度上昇が抑制されるので、ハウジングの材料として、耐熱性に低い材料を用いることが可能になる。あるいは、ハウジングの内側にアルミテープを貼付するなどの耐熱処理が不要になる。その結果、プロジェクタのコストダウンが可能になる。また、仮にユーザがハウジングの排気口近傍に触れたとしても危険ではないので、排気口の位置を自由に設定でき、プロジェクタを構成する各部品の配置の自由度が高くなるので、プロジェクタの小型軽量化が可能になる。 According to the second aspect of the present invention, the mixed air obtained by mixing at least a part of the first cooling air generated by the first fan and cooling the light source unit and the second cooling air generated by the second fan is exhausted. Therefore, the exhaust temperature can be lowered as compared with the case where the first cooling air that has cooled the light source unit is directly exhausted. As a result, since the temperature rise of the housing including the vicinity of the exhaust port is suppressed, a material having low heat resistance can be used as the material of the housing. Or heat-resistant processing, such as sticking an aluminum tape inside a housing, becomes unnecessary. As a result, the cost of the projector can be reduced. In addition, even if the user touches the vicinity of the exhaust port of the housing, it is not dangerous. Therefore, the position of the exhaust port can be set freely, and the degree of freedom of arrangement of each component constituting the projector is increased. Can be realized.

請求項３の発明によれば、ハウジングを、投影レンズによる投影方向、すなわちハウジングの前後方向において、前方に配置された第１収納部と後方に配置された第２収納部に２分割し、高温となる光源部及び画像形成素子を第１収納部に収納しているので、熱に弱い構成要素、例えば半導体素子を用いた制御回路などを第２収納部に収納することによって光源の高熱から遮断することが可能となる。 According to the third aspect of the present invention, the housing is divided into two parts in the projection direction by the projection lens, that is, in the front-rear direction of the housing, into the first storage part disposed in the front and the second storage part disposed in the rear. Since the light source unit and the image forming element to be used are housed in the first housing part, heat-sensitive components such as a control circuit using a semiconductor element are housed in the second housing part to cut off from the high heat of the light source. It becomes possible to do.

本発明の一実施形態に係るプロジェクタについて、図面を参照しつつ説明する。図１は、本発明に係るプロジェクタ１の構成を平面断面図である。また、図２は、プロジェクタ１の外観を示す正面断面図である。さらに、図３は、プロジェクタ１の回路構成を示すブロック図である。このプロジェクタ１は、パーソナルコンピュータやビデオカメラなどから入力された映像信号（画像データ）を用いて画像を形成し、前方に設けられたスクリーンに拡大投影する装置である。 A projector according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional plan view showing a configuration of a projector 1 according to the present invention. FIG. 2 is a front sectional view showing the external appearance of the projector 1. Further, FIG. 3 is a block diagram showing a circuit configuration of the projector 1. The projector 1 is an apparatus that forms an image using a video signal (image data) input from a personal computer, a video camera, or the like, and magnifies and projects it on a screen provided in front.

図１に示すように、プロジェクタ１は、おおまかに、ハウジング２の前方側に配置され、外部から入力された映像信号を用いて画像を形成し、前方のスクリーンに拡大投影する光学エンジン１０と、ハウジング２の後方側に配置され、外部から入力された映像信号を処理して光学エンジン１０を制御する制御部２０で構成されている。また、ハウジング２は投影レンズによる投影方向、すなわちハウジング２の前後方向において、前方に配置された第１収納部２Ａと後方に配置された第２収納部２Ｂに２分割されており、光学エンジン１０は前方の第１収納部に収納されており、制御部２０は後方の第２収納部２Ｂに収納されている。 As shown in FIG. 1, the projector 1 is roughly disposed on the front side of the housing 2, forms an image using a video signal input from the outside, and enlarges and projects the image on a front screen; The control unit 20 is disposed on the rear side of the housing 2 and processes an image signal input from the outside to control the optical engine 10. Further, the housing 2 is divided into two parts in the projection direction by the projection lens, that is, in the front-rear direction of the housing 2, into a first storage portion 2A disposed at the front and a second storage portion 2B disposed at the rear. Is housed in the front first housing part, and the control unit 20 is housed in the rear second housing part 2B.

光学エンジン１０は、例えば放電ランプなどの光源１１と、光源から出射された光のうち後方に出射された光を前方に反射させると共に、所定の領域に集光させる反射板（集光部材）１２と、光源１１から出射された光の光路上に設けられ、三原色に相当するカラーフィルタが所定角度ピッチで形成され、一定速度で回転するカラーホイール１３と、カラーホイール１３を一定速度で回転させるモータ１４と、カラーホイール１３を挟んで光源に対向するように設けられ、所定の内径を有する光トンネル１５と、光トンネルを透過した光束を所定方向に反射するミラー１６と、光トンネル１５及びミラー１６を介して、カラーホイール１３を透過した光束の光路上に設けられ、二次元的に配列された微小ミラーの集合体であって、外部から入力された映像信号に応じて微小ミラーの角度を変化させ、カラーホイール１３を透過した光束を所定方向（第１の方向）と所定方向以外の第２の方向に反射させるＤＭＤ（デジタルマイクロミラーデバイス）１７と、ＤＭＤ１７に対して第１の方向に配置され、ＤＭＤ１７により反射された光束をスクリーン上に投影する投影レンズ１８と、光源１１、反射板（集光部材）１２、カラーホイール１３、光トンネル１５、ＤＭＤ１７を集中的に冷却するためのブロアファン（第１ファン）１９などで構成されている。光源１１と反射板１２は光源部を構成し、光源部のハウジングを兼ねた第１ダクト５Ａ（詳細は句術する）の内部に収納されている。 The optical engine 10 includes, for example, a light source 11 such as a discharge lamp, and a reflecting plate (condensing member) 12 that reflects light emitted backward from the light emitted from the light source and condenses it in a predetermined region. A color wheel 13 provided on an optical path of light emitted from the light source 11 and having color filters corresponding to the three primary colors formed at a predetermined angular pitch and rotating at a constant speed; and a motor for rotating the color wheel 13 at a constant speed. 14, an optical tunnel 15 provided to face the light source with the color wheel 13 interposed therebetween, a mirror 16 that reflects a light beam that has passed through the optical tunnel in a predetermined direction, and the optical tunnel 15 and the mirror 16. Is a set of two-dimensionally arranged micromirrors that are provided on the optical path of the light beam that has passed through the color wheel 13 and enters from the outside. DMD (digital micromirror device) that changes the angle of the micromirror according to the received video signal and reflects the light beam transmitted through the color wheel 13 in a predetermined direction (first direction) and a second direction other than the predetermined direction 17, a projection lens 18 that is arranged in a first direction with respect to the DMD 17 and projects a light beam reflected by the DMD 17 onto the screen, a light source 11, a reflector (condensing member) 12, a color wheel 13, and an optical tunnel. 15 and a blower fan (first fan) 19 for cooling the DMD 17 in a concentrated manner. The light source 11 and the reflection plate 12 constitute a light source part and are accommodated in the first duct 5A (details are phrased) that also serves as a housing of the light source part.

反射板１２は、例えば回転楕円面状に形成されており、光源１１が回転楕円面の一方の焦点近傍に配置され、カラーホイール１３の一部が回転楕円面の他方の焦点近傍に位置するように配置されている。図中、カラーホイール１３よりも右側は、光源ユニットとして独立したユニットに構成され、より多くの光をカラーホイール１３上に集光するために、光源ユニットの内面は、例えば鏡面仕上げされている。一方、光トンネル１５よりも左側は、迷光の影響を少なくするための暗箱ユニットとして形成され、暗箱ユニットの内面は、反射光を吸収するように反射防止塗料が塗布されている。なお、図１及び図２において、ハウジング２の内部を光学エンジン１０側と制御部２０側を仕切るように描かれている仕切り板４は、実際にこのような仕切り板４を設けてもよいし、あるいは、上記光源ユニット及び暗箱ユニットのハウジングの壁を兼用させてもよい。 The reflecting plate 12 is formed in, for example, a spheroid shape, the light source 11 is disposed in the vicinity of one focal point of the spheroid surface, and a part of the color wheel 13 is positioned in the vicinity of the other focal point of the spheroid surface. Is arranged. In the drawing, the right side of the color wheel 13 is configured as an independent unit as a light source unit, and the inner surface of the light source unit is mirror-finished, for example, in order to collect more light on the color wheel 13. On the other hand, the left side of the light tunnel 15 is formed as a dark box unit for reducing the influence of stray light, and the inner surface of the dark box unit is coated with an antireflection coating so as to absorb the reflected light. 1 and 2, the partition plate 4 drawn so as to partition the inside of the housing 2 between the optical engine 10 side and the control unit 20 side may actually be provided with such a partition plate 4. Alternatively, the wall of the light source unit and the housing of the dark box unit may be used together.

ブロアファン１９は、例えばファン１９ａの回転軸方向に空気を吸引し、円周方向に風を吹き出させるような構造であり、モータ（図示せず）及びファン１９ａの他に、所定方向に第１冷却風を吹き出させるためのダクト１９ｂ、１９ｃ及び１９ｄを有している。ダクト１９ｂは、光源１１及び反射板１２を冷却するために、これら光源１１及び反射板１２側に第１冷却風５０を吹き出させる。また、ダクト１９ｃは、ＤＭＤ１７側に第１冷却風５１を吹き出させる。さらに、ダクト１９ｄは、カラーホイール１３及び光トンネル１５側に第１冷却風５２を吹き出させる。なお、光学エンジン１０中、光源１１の温度が最も高くなり、その次に反射板１２の温度が高くなる。そのため、ブロアファン１９から光源１１及び反射板１２側に吹き出される第２冷却風５０の風量が最も多くなるように、各ダクト１９ｂ、１９ｃ及び１９ｄの断面積や断面形状などが設定されている。さらに、第１収納部２Ａには、ブロアファン１９のダクト１９ｂから噴出された第１冷却風５０を光源１１及び反射板１２に誘導するための第１ダクト５Ａ、後述する第２ダクト５Ｂ及び第３ダクト５Ｃが設けられている。 The blower fan 19 has a structure in which, for example, air is sucked in the rotational axis direction of the fan 19a and air is blown out in the circumferential direction. In addition to the motor (not shown) and the fan 19a, the blower fan 19 has a first direction in a predetermined direction. Ducts 19b, 19c and 19d for blowing cooling air are provided. In order to cool the light source 11 and the reflecting plate 12, the duct 19b blows the first cooling air 50 toward the light source 11 and the reflecting plate 12 side. Further, the duct 19c blows the first cooling air 51 to the DMD 17 side. Further, the duct 19d blows the first cooling air 52 toward the color wheel 13 and the optical tunnel 15 side. In the optical engine 10, the temperature of the light source 11 is the highest, and then the temperature of the reflector 12 is increased. Therefore, the cross-sectional areas and cross-sectional shapes of the ducts 19b, 19c, and 19d are set so that the amount of the second cooling air 50 blown from the blower fan 19 toward the light source 11 and the reflector 12 is maximized. . Further, in the first storage portion 2A, a first duct 5A for guiding the first cooling air 50 ejected from the duct 19b of the blower fan 19 to the light source 11 and the reflecting plate 12, a second duct 5B described later, Three ducts 5C are provided.

一方、制御部２０は、映像信号を用いてＤＭＤ１７を駆動するＤＭＤ駆動回路２１と、プロジェクタ１の全体を制御する全体制御回路２２と、光源１１を駆動する光源駆動回路２３と、ＤＭＤ駆動回路２１、全体制御回路２２及び光源駆動回路２３を含むプロジェクタ１の各部に電力を供給するための電源回路２４と、少なくとも光源１１及び電源回路２４を冷却するための冷却風を発生させる冷却ファン３を有している。ＤＭＤ駆動回路２１及び全体制御回路２２は、例えばＣＰＵ、ＲＯＭ、ＲＡＭなどで構成されている。また、必要に応じて、ノイズ除去フィルタなども設けられている。光源駆動回路２３は、放電ランプなどの光源１１を電力が一定となるように制御するためのインバータ回路であり、コイル、ダイオード、ＦＥＴなどで構成されている。放電ランプは、点灯開始直後、その温度が低く、電圧が低いため、電力が一定になるように制御すると大電流がランプに流れてしまい、ランプ寿命が低下するという問題を有している。そのため、光源駆動回路２３は、ランプ点灯開始から一定時間、ランプに流れる電流を制限するウオーミングアップ動作を行う。電源回路２４は、例えば１００Ｖや２００Ｖなどの交流商用電源を入力として、例えば１２Ｖや２４Ｖなどの直流電圧電源を発生させる回路であり、コイル、ダイオード、ＦＥＴなどで構成されている。 On the other hand, the control unit 20 uses a video signal to drive the DMD 17, a DMD drive circuit 21 that controls the entire projector 1, a light source drive circuit 23 that drives the light source 11, and a DMD drive circuit 21. A power supply circuit 24 for supplying power to each part of the projector 1 including the overall control circuit 22 and the light source drive circuit 23, and a cooling fan 3 for generating cooling air for cooling at least the light source 11 and the power supply circuit 24. is doing. The DMD drive circuit 21 and the overall control circuit 22 are constituted by, for example, a CPU, a ROM, a RAM, and the like. Further, a noise removal filter or the like is provided as necessary. The light source driving circuit 23 is an inverter circuit for controlling the light source 11 such as a discharge lamp so that electric power is constant, and is configured by a coil, a diode, an FET, and the like. Since the discharge lamp has a low temperature and a low voltage immediately after the start of lighting, there is a problem that if the electric power is controlled to be constant, a large current flows through the lamp and the lamp life is shortened. For this reason, the light source driving circuit 23 performs a warm-up operation that limits the current flowing through the lamp for a certain period of time after the start of lamp lighting. The power supply circuit 24 is a circuit that generates a DC voltage power source such as 12 V or 24 V, for example, using an AC commercial power source such as 100 V or 200 V as an input, and is configured by a coil, a diode, an FET, or the like.

一般的に、光源駆動回路２３や電源回路２４を構成する部品は、ＣＰＵ、ＲＯＭ、ＲＡＭなどに比べて大きく、かつ重い。そのため、光源駆動回路２３及び電源回路２４の構成部品は、ハウジング２の底部近傍に設けられた第１回路基板２５上に実装されている。また、第１回路基板２５上には、光源駆動回路２３や電源回路２４以外の回路２７を構成する部品も実装されている。一方、ＤＭＤ駆動回路２１及び全体制御回路２２を構成する部品は、光源駆動回路２３や電源回路２４を構成する部品に比べて小さく、かつ軽い。そのため、ＤＭＤ駆動回路２１及び全体制御回路２２の構成部品は、光源駆動回路２３及び電源回路２４が実装されている第１回路基板２５とは異なる第２回路基板２６上に実装されている。 In general, components constituting the light source driving circuit 23 and the power supply circuit 24 are larger and heavier than a CPU, ROM, RAM, or the like. Therefore, the components of the light source driving circuit 23 and the power supply circuit 24 are mounted on the first circuit board 25 provided near the bottom of the housing 2. On the first circuit board 25, components constituting the circuit 27 other than the light source driving circuit 23 and the power supply circuit 24 are also mounted. On the other hand, the components constituting the DMD drive circuit 21 and the overall control circuit 22 are smaller and lighter than the components constituting the light source drive circuit 23 and the power supply circuit 24. Therefore, the components of the DMD driving circuit 21 and the overall control circuit 22 are mounted on a second circuit board 26 different from the first circuit board 25 on which the light source driving circuit 23 and the power supply circuit 24 are mounted.

なお、光源駆動回路２３及び電源回路２４の構成部品の全部が第１回路基板２５上に実装されている必要はなく、これら光源駆動回路２３及び電源回路２４の一方又は両方の一部分だけが第１回路基板２５上に実装され、残りは他の回路基板（図示せず）などに実装されていてもよい。同様に、ＤＭＤ駆動回路２１及び全体制御回路２２の構成部品の全部が第２回路基板２６上に実装されている必要はなく、これらＤＭＤ駆動回路２１及び全体制御回路２２の一方又は両方の一部分だけが第２回路基板２６上に実装され、残りは他の回路基板（図示せず）などに実装されていてもよい。 It is not necessary that all the components of the light source drive circuit 23 and the power supply circuit 24 are mounted on the first circuit board 25, and only one or both of the light source drive circuit 23 and the power supply circuit 24 are the first. It may be mounted on the circuit board 25 and the rest may be mounted on another circuit board (not shown). Similarly, it is not necessary that all of the components of the DMD drive circuit 21 and the overall control circuit 22 are mounted on the second circuit board 26, and only a part of one or both of the DMD drive circuit 21 and the overall control circuit 22 is not required. May be mounted on the second circuit board 26, and the rest may be mounted on another circuit board (not shown).

図１及び図２に示すように、冷却ファン（第２ファン）３は、ハウジング２の外部からハウジング２の内部に空気を取り入れて第２冷却風を発生させ、第２冷却風を制御部２０に導入し、光源駆動回路２３、電源回路２４などの熱源から発生される熱を吸収し、温度が上昇した熱風をハウジング２の外部に排気させるものである。図１に示す構成では、冷却ファン３は、第１収納部２Ａと第２収納部２Ｂに跨るように配置されている。そして、第１収納部２Ａでは、上記第２ダクト５Ｂの吸気側開口が冷却ファン３に対向するように設けられている。冷却ファン３により発生された第２冷却風の一部５３は、第２ダクト５Ｂにより、光源１１及び反射板（集光部材）１２には直接誘導されず、ブロアファン１９により発生された第１冷却風５０の流路における光源１１及び反射板（集光部材）１２の下流側５Ｄに誘導される。 As shown in FIGS. 1 and 2, the cooling fan (second fan) 3 takes in air from the outside of the housing 2 into the housing 2 to generate the second cooling air, and the second cooling air is supplied to the control unit 20. The heat generated by the heat source such as the light source driving circuit 23 and the power supply circuit 24 is absorbed, and the hot air whose temperature has risen is exhausted to the outside of the housing 2. In the configuration shown in FIG. 1, the cooling fan 3 is disposed so as to straddle the first storage portion 2A and the second storage portion 2B. In the first storage portion 2 A, the intake side opening of the second duct 5 B is provided to face the cooling fan 3. A part 53 of the second cooling air generated by the cooling fan 3 is not directly guided to the light source 11 and the reflector (condensing member) 12 by the second duct 5B, but is generated by the blower fan 19. The light is guided to the light source 11 and the downstream side 5D of the reflector (condensing member) 12 in the flow path of the cooling air 50.

図１に示すように、ブロアファン１９により発生された第１冷却風５０は、第１ダクト５Ａにより、光源１１及び反射板１２の内面側に誘導されると共に、反射板１２の背面側にも誘導され、光源１１及び反射板１２の熱を吸収し、第１冷却風５０の流路における光源１１及び反射板１２の下流側５Ｄに誘導される。第１ダクト５Ａ、第２ダクト５Ｂ及び第３ダクト５Ｃは、第１冷却風５０の流路における光源１１及び反射板（集光部材）１２の下流側５Ｄにおいて連通されている。さらに、第３ダクト５Ｃは、図２に示すように、投影レンズ１８の下部の空間に設けられており、ハウジング２の側部に設けられた排気口２Ｃに連通されている。 As shown in FIG. 1, the first cooling air 50 generated by the blower fan 19 is guided to the inner surface side of the light source 11 and the reflecting plate 12 by the first duct 5 A and also to the back side of the reflecting plate 12. It is guided, absorbs heat of the light source 11 and the reflecting plate 12, and is guided to the downstream side 5D of the light source 11 and the reflecting plate 12 in the flow path of the first cooling air 50. The first duct 5 A, the second duct 5 B, and the third duct 5 C are communicated with each other on the downstream side 5 D of the light source 11 and the reflector (condensing member) 12 in the flow path of the first cooling air 50. Further, as shown in FIG. 2, the third duct 5 C is provided in a space below the projection lens 18, and communicates with an exhaust port 2 C provided in a side portion of the housing 2.

光源１１及び反射板１２の下流側５Ｄにおいて、第１ダクト５Ａにより誘導され、光源１１及び反射板１２を冷却した後の熱せられた第１冷却風５４は、第２ダクト５Ｂにより誘導された第２冷却風の一部５３と混合される。ここで、光源１１の内部は、例えば約７００℃という非常な高温になるため、光源１１及び反射板１２を冷却した後の熱せられた第１冷却風５４も１００℃以上の高温になっている。一方、冷却ファン３により発生された第２冷却風の一部５３は、ハウジング２の外部の空気とほぼ同じ温度、すなわち室温と同じであり、一般的に高くても３０℃程度である。さらに、空調が行われている部屋では、室温が２０℃前後に設定されている。そのため、最も温度の高い光源１１及びその次に温度の高い反射板（集光部材）１２を冷却した後の熱せられた第１冷却風５４は、直接ハウジング２の排気口２Ｃから排気されることはなく、この熱せられた第１冷却風５４に比べて遙かに温度に低い第２冷却風の一部５３と混合された後、第１冷却風５４よりも温度の低い混合風５５がハウジング２の排気口２Ｃから排気される。そのため、排気口２Ｃの近傍を含むハウジング２の温度上昇が抑制されるので、ハウジング２の材料として、耐熱性に低い材料を用いることが可能になる。あるいは、ハウジング２の内側にアルミテープを貼付するなどの耐熱処理が不要になる。その結果、プロジェクタ１のコストダウンが可能になる。また、仮にユーザがハウジング２の排気口２Ｃ近傍に触れたとしても危険ではないので、排気口２Ｃの位置を、ハウジング２の側面だけでなく、ハウジングの前面、上面底面など自由に設定できる。さらに、排気口２Ｃの位置を自由に設定できるので、それに伴って、プロジェクタ１を構成する各部品の配置の自由度が高くなり、プロジェクタ１の小型軽量化が可能になる。 On the downstream side 5D of the light source 11 and the reflecting plate 12, the first cooling air 54 that has been guided by the first duct 5A and has cooled the light source 11 and the reflecting plate 12 is guided by the second duct 5B. 2 Mixed with part 53 of cooling air. Here, since the inside of the light source 11 has a very high temperature of about 700 ° C., for example, the heated first cooling air 54 after cooling the light source 11 and the reflection plate 12 has a high temperature of 100 ° C. or more. . On the other hand, a part 53 of the second cooling air generated by the cooling fan 3 is almost the same temperature as the air outside the housing 2, that is, the room temperature, and is generally about 30 ° C. at the highest. Furthermore, in a room where air conditioning is performed, the room temperature is set to around 20 ° C. For this reason, the heated first cooling air 54 after cooling the light source 11 having the highest temperature and the reflector (condensing member) 12 having the next highest temperature is directly exhausted from the exhaust port 2 C of the housing 2. The mixed air 55 having a temperature lower than that of the first cooling air 54 is mixed with the portion 53 of the second cooling air 53 that is much lower in temperature than the heated first cooling air 54. 2 is exhausted from the exhaust port 2C. Therefore, since the temperature rise of the housing 2 including the vicinity of the exhaust port 2C is suppressed, a material having low heat resistance can be used as the material of the housing 2. Alternatively, heat treatment such as attaching an aluminum tape to the inside of the housing 2 becomes unnecessary. As a result, the cost of the projector 1 can be reduced. Further, even if the user touches the vicinity of the exhaust port 2C of the housing 2, there is no danger, so the position of the exhaust port 2C can be freely set not only on the side surface of the housing 2, but also on the front surface and the top bottom surface of the housing. Further, since the position of the exhaust port 2C can be set freely, the degree of freedom of arrangement of the parts constituting the projector 1 is increased accordingly, and the projector 1 can be reduced in size and weight.

また、従来の構成と比較して、ハウジング２に、冷却ファン３により発生された第２冷却風の一部５３を、第１冷却風５４の流路における光源１１及び反射板（集光部材）１２の下流側に誘導するための第２ダクト５Ｂと、熱せられた第１冷却風５４と第２冷却風の一部５３とが混合された混合風５５をハウジング２の排気口２Ｃに誘導する第３ダクト５Ｃをさらに設けただけであるので、ダクトを製造するための金型が若干複雑になる程度であって、ハウジング２の製造コストは従来のものと差はない。さらに、第３ダクト５Ｃは投影レンズ１８の下部の空間に設けられているので、第３ダクト５Ｃを設けてもハウジング２の大きさは従来のものとほとんど同じである。むしろ、上記のように、排気口２Ｃの位置及びプロジェクタ１を構成する各部品の配置の自由度が高くなるので、プロジェクタ１の小型軽量化が可能になる。 Further, compared to the conventional configuration, a part 53 of the second cooling air generated by the cooling fan 3 in the housing 2 is replaced with the light source 11 and the reflector (condensing member) in the flow path of the first cooling air 54. 12 is guided to the exhaust port 2 C of the housing 2 through the second duct 5 B for guiding to the downstream side of 12, the mixed air 55 in which the heated first cooling air 54 and a part 53 of the second cooling air are mixed. Since only the third duct 5C is provided, the mold for manufacturing the duct is slightly complicated, and the manufacturing cost of the housing 2 is not different from the conventional one. Further, since the third duct 5C is provided in the space below the projection lens 18, even if the third duct 5C is provided, the size of the housing 2 is almost the same as the conventional one. Rather, as described above, the degree of freedom in the position of the exhaust port 2C and the arrangement of the components constituting the projector 1 is increased, so that the projector 1 can be reduced in size and weight.

さらに、ハウジング２を、投影レンズ１８による投影方向、すなわちハウジング２の前後方向において、前方に配置された第１収納部２Ａと後方に配置された第２収納部２Ｂに２分割し、高温となる光源１１、反射板（集光部材）１２、ＤＭＤ１７などを第１収納部２Ａに収納しているので、第２収納部２Ｂに収納されたＤＭＤ駆動回路２１、全体制御回路２２、光源駆動回路２３及び電源回路２４などを光源１１の高熱から遮断することが可能となる。 Further, the housing 2 is divided into two parts in the projection direction by the projection lens 18, that is, in the front-rear direction of the housing 2, into a first storage portion 2 A disposed at the front and a second storage portion 2 B disposed at the rear. Since the light source 11, the reflector (condensing member) 12, the DMD 17 and the like are stored in the first storage unit 2A, the DMD drive circuit 21, the overall control circuit 22, and the light source drive circuit 23 stored in the second storage unit 2B. In addition, the power supply circuit 24 and the like can be shielded from the high heat of the light source 11.

なお、本発明は、上記実施形態の構成に限定されるものではなく、様々な変形が可能である。例えば、プロジェクタ１は、ＤＭＤ１７を用いたものに限定されず、画像形成素子として液晶表示素子などを用いたものであってもよい。すなわち、本発明に係るプロジェクタは、画像を形成する画像形成素子と、画像形成素子を照明する光源部（光源、集光部材など）と、画像形成素子により形成された画像を前方に拡大投影する投影レンズと、画像形成素子及び光源を駆動するための駆動回路が実装された回路基板と、前記各部材を収納するハウジングと、ハウジングの外部から空気をハウジング内に吸引し、各部材を冷却する冷却手段を備え、冷却手段は、少なくとも２つの第１ファン及び第２ファンを有し、第１ファンにより発生された冷却風で光源部を冷却し、第１ファンで発生され、光源部を冷却した冷却風と、第２ファンで発生された冷却風の少なくとも一部を混合した混合風を排気するように構成されていればよい。 In addition, this invention is not limited to the structure of the said embodiment, A various deformation | transformation is possible. For example, the projector 1 is not limited to the one using the DMD 17 and may use a liquid crystal display element as an image forming element. That is, a projector according to the present invention enlarges and projects an image formed by an image forming element that forms an image, a light source unit (light source, light collecting member, and the like) that illuminates the image forming element, and the image forming element. A projection lens, a circuit board on which a drive circuit for driving an image forming element and a light source is mounted, a housing that houses each of the members, air is sucked into the housing from the outside of the housing, and each member is cooled. The cooling means includes at least two first fans and second fans, cools the light source unit with cooling air generated by the first fan, and cools the light source unit generated by the first fan. What is necessary is just to be comprised so that the mixed air which mixed at least one part of the cooling air which generate | occur | produced and the 2nd fan may be exhausted.

本発明の一実施形態に係るプロジェクタの構成を示す平面断面図。1 is a plan sectional view showing a configuration of a projector according to an embodiment of the invention. 上記プロジェクタの構成を示す正面断面図。FIG. 2 is a front sectional view showing a configuration of the projector. 上記プロジェクタの回路構成を示すブロック図。The block diagram which shows the circuit structure of the said projector.

Explanation of symbols

１プロジェクタ
２ハウジング
２Ａ第１収納部
２Ｂ第２収納部
２Ｃ排気口
３冷却ファン（第２ファン）
４空洞部
５Ａ第１ダクト
５Ｂ第２ダクト
５Ｃ第３ダクト
５Ｄ光源及び反射板（集光部材）の下流側
１０光学エンジン
１１光源
１２反射板
１３カラーホイール
１４モータ
１５光トンネル
１６ミラー
１７ＤＭＤ（デジタルマイクロミラーデバイス）
１８投影レンズ
１９ブロアファン（第１ファン）
１９ｂ、１９ｃ、１９ｄダクト
２０制御部
２１ＤＭＤ駆動回路
２２全体制御回路
２３光源駆動回路
２４電源回路
５０、５１、５２第１冷却風
５３第２冷却風の一部
５４熱せられた第１冷却風
５５混合風 DESCRIPTION OF SYMBOLS 1 Projector 2 Housing 2A 1st accommodating part 2B 2nd accommodating part 2C Exhaust port 3 Cooling fan (2nd fan)
4 Cavity 5A 1st duct 5B 2nd duct 5C 3rd duct 5D Downstream side 10 of light source and reflector (condensing member) 10 Optical engine 11 Light source 12 Reflector 13 Color wheel 14 Motor 15 Optical tunnel 16 Mirror 17 DMD (digital) Micromirror device)
18 Projection lens 19 Blower fan (first fan)
19b, 19c, 19d Duct 20 Controller 21 DMD drive circuit 22 Overall control circuit 23 Light source drive circuit 24 Power supply circuits 50, 51, 52 First cooling air 53 Part of second cooling air 54 Heated first cooling air 55 Mixed wind

Claims

A light source;
A color wheel provided on the optical path of the light emitted from the light source, the color filters corresponding to the three primary colors are formed at a predetermined angular pitch, and rotated at a constant speed;
A condensing member including at least a reflector for condensing light emitted from the light source onto a part of the color wheel;
An assembly of two-dimensionally arranged micromirrors provided on an optical path of a light beam transmitted through the color wheel, and changing the angle of the micromirrors according to an image signal input from the outside, DMD (digital micromirror device) that reflects the light beam transmitted through the color wheel in a predetermined direction and a direction other than the predetermined direction;
A projection lens disposed in the predetermined direction with respect to the DMD and projecting a light beam reflected by the DMD onto a screen;
A DMD driving circuit for driving the DMD using the video signal;
An overall control circuit for controlling the entire projector;
A light source driving circuit for driving the light source;
A power supply circuit for supplying power to each part of the projector including the DMD drive circuit, the overall control circuit, and the light source drive circuit;
A blower fan that generates a first cooling air for intensively cooling the light source, the condensing member, and the DMD;
A cooling fan that generates at least a second cooling air for cooling the power supply circuit;
In a projector provided with a housing for storing each member,
The housing has a first storage portion disposed in the front and a second storage portion disposed in the rear in the projection direction of the projection lens,
The light source, the color wheel, the condensing member, the DMD, the projection lens, and the blower fan are stored in the first storage unit,
The DMD drive circuit, the overall control circuit, the light source drive circuit, and the power supply circuit are housed in the second housing part,
The cooling fan is disposed so as to straddle the first storage part and the second storage part,
The blower fan has a first duct for guiding the first cooling air to the light source and the light collecting member side,
In the first storage part, a part of the second cooling air generated by the cooling fan is not directly guided to the light source and the light collecting member, and the first cooling air generated by the blower fan is not guided. A second duct for guiding the light source and the light collecting member downstream of the light source and the light collecting member in the flow path; and the heated first cooling air after cooling the light source and the light collecting member and the second duct. A third duct for guiding the mixed air mixed with a part of the second cooling air to the exhaust port of the housing through the lower part of the projection lens,
Accordingly, the heated first cooling air after cooling the light source and the light collecting member and a part of the second cooling air are mixed to exhaust the mixed air whose temperature has been reduced, thereby near the exhaust port. A projector characterized in that an increase in temperature of the housing including the head is suppressed.

An image forming element that forms an image, a light source unit that illuminates the image forming element, a projection lens that enlarges and projects an image formed by the image forming element forward, and a drive for driving the image forming element and the light source In a projector including a circuit board on which a circuit is mounted, a housing that houses each member, and a cooling unit that sucks air into the housing from the outside of the housing and cools the members.
The cooling means has at least two first fans and second fans,
Cooling the light source unit with the first cooling air generated by the first fan;
A projector that exhausts mixed air generated by mixing the first cooling air generated by the first fan and cooling the light source unit and at least part of the second cooling air generated by the second fan. .

The first storage part is disposed in front of the housing in the projection direction by the projection lens, and the second storage part is disposed in the rear of the housing,
The image forming element, the light source unit, the projection lens, and the first fan are provided in the first storage unit,
The second fan is provided to straddle the first storage part and the second storage part,
In the first storage part, at least a part of the second cooling air generated by the second fan is not directly guided to the light source part, and the flow path of the first cooling air generated by the first fan. The projector according to claim 2, further comprising a duct for guiding downstream of the light source unit.