WO2020150972A1 - 一种单片lcd投影机 - Google Patents

一种单片lcd投影机 Download PDF

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Publication number
WO2020150972A1
WO2020150972A1 PCT/CN2019/073011 CN2019073011W WO2020150972A1 WO 2020150972 A1 WO2020150972 A1 WO 2020150972A1 CN 2019073011 W CN2019073011 W CN 2019073011W WO 2020150972 A1 WO2020150972 A1 WO 2020150972A1
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WO
WIPO (PCT)
Prior art keywords
lens
lcd
mirror
light valve
chip
Prior art date
Application number
PCT/CN2019/073011
Other languages
English (en)
French (fr)
Inventor
陈灵
Original Assignee
长沙创荣电子科技有限公司
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Filing date
Publication date
Application filed by 长沙创荣电子科技有限公司 filed Critical 长沙创荣电子科技有限公司
Priority to PCT/CN2019/073011 priority Critical patent/WO2020150972A1/zh
Priority to US16/263,150 priority patent/US10509306B1/en
Publication of WO2020150972A1 publication Critical patent/WO2020150972A1/zh

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Classifications

    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03BAPPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00Projectors or projection-type viewers; Accessories therefor
    • G03B21/14Details
    • G03B21/28Reflectors in projection beam
    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03BAPPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00Projectors or projection-type viewers; Accessories therefor
    • G03B21/005Projectors using an electronic spatial light modulator but not peculiar thereto
    • G03B21/006Projectors using an electronic spatial light modulator but not peculiar thereto using LCD's
    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03BAPPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00Projectors or projection-type viewers; Accessories therefor
    • G03B21/14Details
    • G03B21/16Cooling; Preventing overheating
    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03BAPPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00Projectors or projection-type viewers; Accessories therefor
    • G03B21/14Details
    • G03B21/20Lamp housings
    • G03B21/2006Lamp housings characterised by the light source
    • G03B21/2033LED or laser light sources
    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03BAPPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00Projectors or projection-type viewers; Accessories therefor
    • G03B21/14Details
    • G03B21/20Lamp housings
    • G03B21/2066Reflectors in illumination beam

Definitions

  • the present invention relates to the technical field of projectors, and more particularly to a single-chip LCD projector.
  • a single-chip LCD projector refers to a projection in which a full-color, transmissive liquid crystal screen (LCD) is used as a light valve, and based on Kohler illumination, the image of the light valve is enlarged and projected on the screen through a projection lens Machine products. 5 See there are single-chip LCD projectors. Depending on the light path structure, there are two types of structures: direct projection and reflection. Among them, the direct projection single LCD projector has a large shape, low volume utilization, and outdated shape.
  • the purpose of the present invention is to overcome the deficiencies of the prior art, and provide a single-chip LCD projector with a small volume, a novel shape, small image color difference, good heat dissipation performance, and a more diversified shape selection.
  • the present invention provides a single-chip LCD projector, including an LED light source, a condenser lens, a collimator lens, an LCD light valve, a field lens, and a projection lens.
  • the LCD light valve is provided on the collimator lens and Between the field lenses, the condenser lens is arranged between the LED light source and the collimator lens, the projection lens is arranged behind the field lens, and a reflecting mirror is arranged between the field lens and the projection lens, so The first mirror reflects mirror image along its long axis.
  • a second reflecting mirror is provided between the condenser lens and the collimating lens, and the second reflecting mirror is arranged along its long axis Mirror reflection.
  • the included angle between the optical axis of the projection lens and the reference horizon is 01, 0%, 01 ⁇ 14°.
  • the angle between the optical axis of the LCD light valve and the reference horizon is 02, 55° ⁇ 02 ⁇ 1
  • the included angle between the optical axis of the condenser lens and the reference horizon is 04, 0% 04 ⁇ 45° or 180
  • the space gap between the collimator lens and the LCD light valve and between the LCD light valve and the field lens forms a heat dissipation air duct, and the air inlet of the heat dissipation air duct is located in the LCD light valve The air outlet is located on the other long side of the LCD light valve.
  • the present invention is provided with a mirror 1 between the field lens and the projection lens.
  • the volume is smaller and the mirror 1 is mirrored along its long axis.
  • the mirror coating technology requirements are low, and the manufacturing cost of the mirror is reduced, thereby reducing the manufacturing cost of the projector.
  • the reflective performance of the mirror is good. The image color uniformity is better and the image quality is improved.
  • the present invention is provided with two mirrors between the condenser lens and the collimating lens, and with a mirror one between the field lens and the projection lens.
  • the volume is more Small and compact, it can make full use of the space in the projector, reduce packaging, transportation and storage costs, and the appearance of the projector has changed from a traditional "horizontal" structure to a "vertical” structure, which has significant novelty and further improves market competitiveness ,
  • both reflector 1 and reflector 2 are arranged in a mirror reflection along their long axis.
  • the coating requirements of the reflector are relatively low, which reduces the manufacturing cost of the reflector and improves the yield rate. Therefore, the manufacturing cost of the projector is reduced, and the reflector has good reflection performance, small image chromatic aberration, and improved image quality.
  • the space gap between the collimator lens and the LCD light valve and between the LCD light valve and the field lens of the present invention forms a heat dissipation air duct, and the air inlet of the heat dissipation air duct is located on a long side of the LCD light valve, and the air outlet Located on the other long side of the LCD light valve, that is, the cooling air enters from one long side of the LCD light valve and flows out from the other long side.
  • the heat dissipation air duct is short and diffuse
  • the thermal effect is good, and the temperature consistency of the LCD light valve can be ensured as much as possible, so that the response speed and brightness uniformity are better, so as to ensure that the LCD light valve can provide the best display effect, and it also improves the LCD light valve to a certain extent. Service life.
  • the included angle 01 between the optical axis of the projection lens of the present invention and the reference horizon one is greater than 0°, compared to the angle between the optical axis of the projection lens in the existing reflective single-chip LCD projector and the reference horizon one
  • the angle is 0°, so that the image projected by the projector onto the screen can obtain a larger off-axis, and the application scenarios are wider.
  • FIG. 1 is a schematic structural diagram of Embodiment 1 of the present invention.
  • FIG. 2 is a schematic structural diagram 1 of Embodiment 2 of the present invention.
  • FIG. 3 is a second structural diagram of the second embodiment of the present invention.
  • a single-chip LCD projector provided by the present invention includes an LED light source 1, a condenser lens 2 (or a hollow square cone light pipe), a collimator lens 4, an LCD light valve 5, and a field lens 6 and the projection lens 8, the LCD light valve 5 is arranged between the collimator lens 4 and the field lens 6, the condenser lens 2 is arranged between the LED light source 1 and the collimator lens 4, the projection lens 8 is located behind the field lens 6; between the field lens 6 and the projection lens 8 There is a mirror 7; the mirror 7 reflects mirror images along its long axis.
  • a mirror 7 is provided between the field lens 6 and the projection lens 8.
  • the volume is smaller and the mirror 7 is arranged along the edge.
  • the long-axis mirror reflection layout method has lower technical requirements for the coating of the mirror 7 and reduces the manufacturing cost of the mirror 7 thereby reducing the manufacturing cost of the projector. 7 Good reflection performance, better image color uniformity, improve the quality of the projection picture, and provide a new type of choice for the overall shape of the projector.
  • a single-chip LCD projector provided by the present invention includes an LED light source 1, a condenser lens 2, a collimator lens 4, an LCD light valve 5, a field lens 6 and a projection lens 8.
  • the LCD light valve 5 is provided between the collimator lens 4 and the field lens 6
  • the condenser lens 2 is provided between the LED light source 1 and the collimator lens 4
  • the projection lens 8 is provided on the field lens 6 behind;
  • the condenser lens 2 and the collimator lens 4 are provided with two mirrors 3
  • the field lens 6 and the projection lens 8 are provided with a mirror 7 between the two mirrors 3 Mirror reflection along its long axis, the mirror 7 is mirror reflection along its long axis.
  • a mirror two 3 is provided between the condenser lens 2 and the collimator lens 4, and a mirror one 7 is provided between the field lens 6 and the projection lens 8, which is compared with the existing reflective single-piece LCD projectors are more compact, can make full use of the space inside the projector, reduce packaging, transportation and storage costs, further improve market competitiveness, and promote the development of single-chip LCD projectors.
  • both the mirror two 3 and the mirror one 7 are arranged in a mirror reflection along their long axis.
  • the coating cost of the mirror 3 is low, and the manufacturing cost of the mirror 3 is reduced. Therefore, the manufacturing cost of the projector is reduced, and the reflector 3 has good reflection performance, small image chromatic aberration, and improved image quality.
  • the mirror 7 is called the "short axis mirrored reflection"; in the same way, if the image on the screen is mirrored along the major axis of the mirror 7, The mirror 7 is called "long axis mirror reflection". In the above embodiment, the mirror 7 is mirrored along the long axis. According to the principle of the mirror, when the mirror 7 reflects light on the optical path, when the image is mirrored along the minor axis of the mirror 7, the mirror 1 7 The angle difference of the edge ray will be much larger than the angle difference when it is mirrored along the long axis.
  • mirror 7 Mirror reflection along the long axis
  • mirror two 3 mirror reflection along the long axis
  • mirror two 3 has better cost performance and performance.
  • the LCD light valve 5 has a special structure (the surface is glass). Or polarizing materials, including CF film, liquid crystal and TFT, etc.), which have very poor heat dissipation capacity. Therefore, when the temperature reaches a certain level, the TFT (thin film transistor) and the liquid crystal will start to fail and produce various abnormalities, causing the LCD light valve 5 Can not continue to work, so in order to ensure the normal operation of the LCD_5, the projector needs to dissipate the LCD light valve 5.
  • the cooling method is to take away the heat from the surface of the LCD light valve 5 through an axial fan or a blower, or through a reasonably designed wind Therefore, the heat dissipation fan of the LED light source 1 removes the heat from the surface of the LCD light valve 5.
  • the above embodiment is further preferably, as shown in FIGS. 1-3, the space gap between the collimator lens 4 and the LCD-5 and between the LCD light valve 5 and the field lens 6 forms a heat dissipation air channel,
  • the air inlet of the heat dissipation air duct is located on one long side of the LCD light valve 5, and the air outlet is located on the other long side of the LCD light valve 5, that is, the cooling air enters from one long side of the LCD light valve 5, from The other long side flows out.
  • the cooling air passes through the heat dissipation duct, on the air inlet side, because the temperature difference between the cooling air and the surface of the LCD light valve 5 is large, it can take away more heat and has better heat dissipation capacity.
  • the cooling air continuously takes away the heat from the surface of the LCD light valve 5, and is continuously heated by the heat exchange on the surface of the LCD light valve 5.
  • the surface of the LCD light valve 5 The temperature difference is gradually reduced, and the heat taken away will be reduced.
  • the LCD light valve 5 has a short distance from one long side to the other long side, and the heat dissipation air duct is short, so that the cooling air flows from the air inlet to the air outlet.
  • the temperature difference is small, so more heat can be taken away, and the heat dissipation effect is good, so as to ensure the temperature consistency, response speed and brightness uniformity of the LCD light valve 5, which greatly increases the service life of the LCD light valve 5, thereby improving the projector’s
  • the service life can reduce the maintenance cost in the later period; at the same time, the LCD light valve 5 can withstand stronger light, so that the output brightness of the projector is improved, and the brightness of the image screen is further improved.
  • the angle between the optical axis of the projection lens 8 and the reference horizon-9 is 01, 01>0°, preferably 0° ⁇ 01 ⁇ 14°, further, preferably, 0° ⁇ 01 ⁇ 14°
  • the image projected by the projector onto the screen can obtain a larger off-axis, which can avoid the lack of an image when the projector is placed horizontally on the desktop in an unoff-axis design, and the application scenarios are wider.
  • the angle 02 between the optical axis passing through the LCD light valve 5 and the reference horizon 9 is 55° ⁇ 02 ⁇ 125°; in the second embodiment, the second mirror The angle between 3 and the reference horizon two 10 is 03, 0 ⁇ 03 ⁇ 45° (in Figure 2), or -45%03 ⁇ 0° (in Figure 3); the optical axis of the condenser lens 2 and the reference horizon two 10 The included angle between 04, 0° ⁇ 04 ⁇ 45° (in Figure 2), or 180. ⁇ 04 ⁇ 225. (In Figure 3), the reference horizon one 9 and the reference horizon two 10 are parallel to each other.
  • angles in the above embodiments are optimized to ensure that the projector is compact, to make full use of the space in the projector, to reduce packaging, transportation and storage costs, and to change the shape of the projector from a traditional "horizontal" structure.
  • the "vertical” structure has significant novelty, which further improves market competitiveness and promotes the development of single-chip LCD projectors.

Abstract

一种单片LCD投影机,包括LED光源(1)、聚光镜(2)、准直镜(4)、LCD光阀(5)、场镜(6)和投影镜头(8),LCD光阀(5)设于准直镜(4)和场镜(6)之间,聚光镜(2)设于LED光源(1)和准直镜(4)之间,投影镜头(8)设于场镜(6)的后面,场镜(6)与投影镜头(8)之间设有反射镜一(7),反射镜一(7)呈沿其长轴镜像反射。单片LCD投影机具有体积小巧,外形新颖,图像色均匀度好,散热性能好,使用寿命长等特点。

Description

一种单片 LCD投影机
技术领域
[0001] 本发明涉及投影机技术领域, 尤其是涉及一种单片 LCD投影机。
背景技术
[0002] 单片 LCD投影机, 是指使用一片全彩的、 透射式的液晶屏 (LCD) 为光阀, 基 于科勒照明, 通过投影镜头将光阀的图像放大投射于屏幕上的一种投影机产品 。 5见有单片 LCD投影机, 根据光路结构的不同, 具有直投式和反射式两种结构 形式, 其中直投式单 LCD投影机, 由于外形较大, 容积利用率不高, 造型过时 等因素, 现市场上已经很少见到; 反射式单 LCD投影机, 如专利文献 CN2018105 22555.0公开的一种单片式液晶投影机, 其在投影机宽度基本维持不变的情况下 , 显著减小了投影机的长度, 以减少投影机内部的无用空间, 同等条件下使得 投影机体积更小型化, 但 LCD光阀散热性能较差, 对反射镜镀膜的性能要求极 高, 否则反射性能差, 导致投影在屏幕上的图像色均匀度差, 影响图像画面质 量, 实用效果比较局限。
发明概述
技术问题
问题的解决方案
技术解决方案
[0003] 本发明的目的就在于克服现有技术的不足, 提供了一种体积小巧, 造型新颖, 图像色差小, 散热性能好, 且外形选择更加多元化的单片 LCD投影机。 为了 实现上述目的, 本发明提供了一种单片 LCD投影机, 包括 LED光源、 聚光镜、 准 直镜、 LCD光阀、 场镜和投影镜头, 所述 LCD光阀设于所述准直镜和场镜之间 , 所述聚光镜设于所述 LED光源和准直镜之间, 所述投影镜头设于所述场镜的后 面, 所述场镜与投影镜头之间设有反射镜一, 所述反射镜一呈沿其长轴镜像反 射。
[0004] 进一步地, 所述聚光镜与准直镜之间设有反射镜二, 所述反射镜二呈沿其长轴 镜像反射。
[0005] 进一步地, 所述投影镜头的光轴与参考地平线一之间的夹角 01, 0%01^14°。
[0006] 进一步地, 穿过所述 LCD光阀的光轴与参考地平线一之间的夹角 02, 55°<02<1
25。。
[0007] 进一步地, 所述反射镜二 (3) 与参考地平线二之间的夹角 03, (K03S45。或 -45
。 0。。
[0008] 进一步地, 所述聚光镜的光轴与参考地平线二之间的夹角 04, 0%04<45°或 180
°<04<225°。
[0009] 进一步地, 所述准直镜与 LCD光阀之间和所述 LCD光阀与场镜之间的空间间隙 形成散热风道, 所述散热风道的进风口位于所述 LCD光阀的一长边, 出风口位 于所述 LCD光阀的另一长边。
[0010] 本发明的有益效果:
[0011] 1、 本发明在场镜与投影镜头之间设有反射镜一, 相比于现有直投式单片 LCD 投影机, 其体积更加小巧, 又反射镜一呈沿其长轴镜像反射的布局方式, 相比 于现有反射式单片 LCD投影机, 因为反射角度的不同, 反射镜镀膜技术要求低 , 降低反射镜制造成本, 从而降低投影机制造成本, 同时反射镜反射性能好, 图像色均匀度更好, 提高图像质量。
[0012] 2、 本发明在聚光镜与准直镜之间设有反射镜二, 和场镜与投影镜头之间设有 反射镜一, 相比于现有反射式单片 LCD投影机, 体积更加小巧, 能更充分利用 投影机内的空间, 降低包装、 运输和存储成本, 且投影机外形由传统“卧式”结构 变成了“立式”结构, 具有显著的新意, 进一步提高市场竞争力, 推动单片 LCD投 影机的发展。 同时反射镜一和反射镜二均呈沿其长轴镜像反射的布局方式, 相 比于现有反射式单片 LCD投影机, 反射镜镀膜要求相对要低, 降低反射镜制造 成本和提高良品率, 从而降低投影机制造成本, 同时反射镜反射性能好, 图像 色差小, 提高图像质量。
[0013] 3、 本发明准直镜与 LCD光阀之间和 LCD光阀与场镜之间的空间空隙形成散热 风道, 散热风道的进风口位于 LCD光阀的一长边, 出风口位于 LCD光阀的另一 长边, 即冷却风从 LCD光阀的一长边进入, 从另一长边流出, 散热风道短, 散 热效果好, 能尽可能地保证 LCD光阀温度的一致性, 使得响应速度和亮度均匀 性等更好, 从而保障 LCD光阀能提供最好的显示效果, 也一定程度提升了 LCD 光阀的使用寿命。
[0014] 4、 本发明投影镜头的光轴与参考地平线一之间的夹角 01 > 0°, 相比于现有反 射式单片 LCD投影机中投影镜头的光轴与参考地平线一之间夹角呈 0°, 使得投影 机投影至屏幕上的图像能获得较大的偏轴, 应用场景更广。
发明的有益效果
对附图的简要说明
附图说明
[0015] 为了更清楚地说明本发明实施例或现有技术中的技术方案, 下面将对实施例或 5见有技术描述中所需要使用的方案作简单地附图介绍。 显而易见地, 下面描述 中的方案仅仅是本发明的一些实施例, 对于本领域普通技术人员来讲, 在不付 出创造性劳动的前提下, 还可以根据这些附图方案获得其他的方案。
[0016] 图 1为本发明实施例一的结构示意图。
[0017] 图 2为本发明实施例二的结构示意图一。
[0018] 图 3为本发明实施例二的结构示意图二。
[0019] 上述附图标记:
[0020] 1 LED光源, 2聚光镜, 3反射镜二, 4准直镜, 5 LCD^K , 6场镜, 7反射镜一 , 8投影镜头, 9参考地平线一, 10参考地平线二。
发明实施例
本发明的实施方式
[0021] 下面结合附图对发明进一步说明, 但不用来限制本发明的范围。
[0022] 实施例一
[0023] 如图 1所示, 本发明提供的一种单片 LCD投影机, 包括 LED光源 1、 聚光镜 2 ( 或空心的方锥光导管) 、 准直镜 4、 LCD光阀 5、 场镜 6和投影镜头 8, 所述 LCD 光阀 5设于所述准直镜 4和场镜 6之间, 所述聚光镜 2设于所述 LED光源 1和准直镜 4 之间, 所述投影镜头 8设于所述场镜 6的后面; 所述场镜 6与所述投影镜头 8之间 设有反射镜一 7 ; 所述反射镜一 7呈沿其长轴镜像反射。
[0024] 本实施方式中, 场镜 6与投影镜头 8之间设有反射镜一 7 , 相比于现有直投式单 片 LCD投影机, 其体积更加小巧, 又反射镜一 7呈沿其长轴镜像反射的布局方式 , 相比于现有反射式单片 LCD投影机, 反射镜一 7镀膜技术要求低, 降低反射镜 一 7制造成本, 从而降低投影机制造成本, 同时反射镜一 7反射性能好, 图像色 均匀度更好, 提高投影画面质量, 同时对投影机整机的外形, 提供一种新型的 选择。
[0025] 实施例二
[0026] 如图 2和 3所示, 本发明提供的一种单片 LCD投影机, 包括 LED光源 1、 聚光镜 2 、 准直镜 4、 LCD光阀 5、 场镜 6和投影镜头 8, 所述 LCD光阀 5设于所述准直镜 4 和场镜 6之间, 所述聚光镜 2设于所述 LED光源 1和准直镜 4之间, 所述投影镜头 8 设于所述场镜 6的后面; 所述聚光镜 2与准直镜 4之间设有反射镜二 3 , 和所述场 镜 6与所述投影镜头 8之间设有反射镜一 7 , 所述反射镜二 3呈沿其长轴镜像反射 , 所述反射镜一 7呈沿其长轴镜像反射。
[0027] 本实施方式中, 聚光镜 2与准直镜 4之间设有反射镜二 3, 和场镜 6与投影镜头 8 之间设有反射镜一 7 , 相比于现有反射式单片 LCD投影机, 体积更加小巧, 能更 充分利用投影机内的空间, 降低包装、 运输和存储成本, 进一步提高市场竞争 力, 推动单片 LCD投影机的发展。 同时反射镜二 3和反射镜一 7均呈沿其长轴镜 像反射的布局方式, 相比于现有反射式单片 LCD投影机, 反射镜 3镀膜成本低, 降低反射镜 3的制造成本, 从而降低投影机制造成本, 同时反射镜 3反射性能好 , 图像色差小, 提高图像画面质量。
[0028] 5见有 LCD _5呈非正方形的形式, 其是以某种宽高比的形式存在, 如常见的“
4:3”, “16:9”, “16: 10”“2: 1”等宽高比的显示装置, 通常把 LCD光阀 5尺寸较大的 一边称为“长边”或“长边方向”, 较小的边称为“短边”或“短边方向”, 作 LCD光阀 5的垂直平分线, 和长边平行的平分线称为“长轴”, 和短边平行的平分线称为“短 轴”, 同理屏幕、 反射镜二 3和反射镜一 7的长轴和短轴同 LCD光阀 5的定义方式类 似。 根据反射镜原理, 如果屏幕的图像是沿反射镜一 7短轴被镜像, 则称该片反 射镜一 7为“短轴镜像反射”; 同理, 如果屏幕的图像是沿反射镜一 7长轴被镜像, 则称该片反射镜一 7为“长轴镜像反射”。 以上实施例中, 反射镜一 7呈沿长轴镜像 反射, 根据反射镜原理, 反射镜一 7在光路上对光线进行反射的时候, 图像沿反 射镜一 7短轴被镜像时, 反射镜一 7其边缘光线角度差会远大于沿长轴被镜像时 的角度差, 而角度差越大, 反射镜一 7镀膜成本越高, 且反射镜一 7反射性能也 越低, 因此反射镜一 7沿长轴镜像反射, 反射镜一 7具有更好的性价比和性能, 同理反射镜二 3呈沿长轴镜像反射, 反射镜二 3具有更好的性价比和性能。
[0029] 投影机运行过程中, 被阻挡的光线在 LCD光阀 5上以吸收的形式转化为热量, 故大部分光线成了发热源, LCD光阀 5由于其结构的特殊性 (表面为玻璃或偏光 材料, 内部有包括 CF膜、 液晶和 TFT等) , 散热能力极差, 故温度到一定程度 时, 组成 TFT (薄膜晶体管) 和液晶便开始失效和产生各种异常, 造成 LCD光阀 5不能继续工作, 因此为保证 LCD _5的正常运行, 投影机需对 LCD光阀 5进行 散热, 其冷却方式有通过轴流风机或鼓风机带走 LCD光阀 5表面的热量, 或者通 过设计合理的风道, 由 LED光源 1的散热风机抽走 LCD光阀 5表面的热量。
[0030] 以上实施例进一步优选地, 如图 1-3所示, 所述准直镜 4与 LCD _5之间和所 述 LCD光阀 5与场镜 6之间的空间间隙形成散热风道, 所述散热风道的进风口位 于所述 LCD光阀 5的一长边, 出风口位于所述 LCD光阀 5的另一长边, 即冷却风 从 LCD光阀 5的一长边进入, 从另一长边流出, 其中冷却风经过散热风道时, 在 进风口一侧因为冷却风和 LCD光阀 5表面温差大, 能带走的热量较多, 具有较好 的散热能力, 随着风在散热风道内向前移动, 冷却风不断带走 LCD光阀 5表面的 热量, 且不断被 LCD光阀 5表面的热量交换而加热升温, 随着冷却风温度的升高 与 LCD光阀 5表面温差逐步减小, 带走的热量会减小, 而本实施方式中 LCD光阀 5由一长边至另一长边的距离短, 散热风道短, 从而冷却风从进风口到出风口的 温差小, 从而能带走更多的热量, 散热效果好, 以保证 LCD光阀 5温度的一致性 、 响应速度和亮度均匀性等, 大大提高 LCD光阀 5的使用寿命, 从而提高投影机 的使用寿命, 降低后期维护成本; 同时 LCD光阀 5能承受更强的光照, 使得投影 机输出亮度得到提高, 进一步提升图像画面的亮度。
[0031] 以上实施例进一步优选地, 如图 1-3所示, 所述投影镜头 8的光轴与参考地平线 一 9之间的夹角 01, 01>0° , 优选地, 0°<01<14° , 进一步, 优选地, 0° < 01<14° , 如此投影机投影至屏幕上的图像能获得较大的偏轴, 可避免无偏轴设计时, 投影机水平放置于桌面上时, 桌面可能挡图像的不足, 应用场景更广。 进一步 优选地, 实施例一和实施例二中, 穿过 LCD光阀 5的光轴与参考地平线一 9之间 的夹角 02, 55°<02<125°; 实施例二中, 反射镜二 3与参考地平线二 10之间的夹 角 03, 0<03<45° (图 2中) , 或 -45%03^0° (图 3中) ; 聚光镜 2的光轴与参考地 平线二 10之间的夹角 04, 0°<04<45° (图 2中) , 或 180。<04<225。 (图 3中) , 其 中参考地平线一 9与参考地平线二 10相互平行。 上述实施例中各角度的优选, 以 能保证投影机体积小巧, 能更充分利用投影机内的空间, 降低包装、 运输和存 储成本, 且使投影机外形由传统“卧式”结构变成了“立式”结构, 具有显著的新意 , 进一步提高市场竞争力, 推动单片 LCD投影机的发展。
[0032] 以上实施例中, 与现有直投式单片 LCD投影机和反射式单片 LCD投影机的相比 , 是建立在“同等光学设计参数”前提下 (注: 同等光学设计参数即意味着 LED光 源 1、 聚光镜 2、 准直镜 4、 LCD光阀 5、 场镜 6、 投影镜头 8等, 参数和尺寸都一 样, 所以光路长度尺寸一致, 从而使得投影机电源功率, 散热系统等也非常类 似或一致) 。
[0033] 以上显示和描述了本发明的基本原理、 主要特征和本发明的优点。 本行业的技 术人员应该了解, 本发明不受上述实施例的限制, 上述实施例和说明书中描述 的只是说明本发明的原理, 在不脱离本发明精神和范围的前提下本发明还会有 各种变化和改进, 这些变化和改进都落入要求保护的本发明范围内。 本发明要 求保护范围由所附的权利要求书及其等同物界定。

Claims

权利要求书
[权利要求 1] 一种单片LCD投影机, 包括LED光源 (1) 、 聚光镜 (2) 、 准直镜 (
4) 、 LCD光阀 (5) 、 场镜 (6) 和投影镜头 (8) , 所述LCD光阀 (
5) 设于所述准直镜 (4) 和场镜 (6) 之间, 所述聚光镜 (2) 设于所 述LED光源 (1) 和准直镜 (4) 之间, 所述投影镜头 (8) 设于所述 场镜 (6) 的后面, 其特征在于: 所述场镜 (6) 与所述投影镜头 (7
) 之间设有反射镜一 (7) , 所述反射镜一 (7) 呈沿其长轴镜像反射
[权利要求 2] 根据权利要求 1所述的一种单片LCD投影机, 其特征在于, 所述聚光 镜 (2) 与准直镜 (4) 之间设有反射镜二 (3) , 所述反射镜二 (3) 呈沿其长轴镜像反射。
[权利要求 3] 根据权利要求 1或 2所述的一种单片LCD投影机, 其特征在于, 所述投 影镜头 (8) 的光轴与参考地平线一 (9) 之间的夹角 01, 0°<01<14°
[权利要求 4] 根据权利要求 1或 2所述的一种单片LCD投影机, 其特征在于, 穿过所 述LCD光阀 (5) 的光轴与参考地平线一 (9) 之间的夹角 02, 55°<0 2<125°=
[权利要求 5] 根据权利要求 2所述的一种单片LCD投影机, 其特征在于, 所述反射 镜二 (3) 与参考地平线二 (10) 之间的夹角 03, (K03S45。或 -45S0 3<0°=
[权利要求 6] 根据权利要求 2所述的一种单片LCD投影机, 其特征在于, 所述聚光 镜 ⑵ 的光轴与参考地平线二 (10) 之间的夹角 04, 0°<04<45°^1 80°<04<225°。
[权利要求 7] 根据权利要求 1或 2所述的一种单片LCD投影机, 其特征在于, 所述准 直镜 (4) 与LCD光阀 (5) 之间和所述LCD光阀 (5) 与场镜 (6) 之 间的空间间隙形成散热风道, 所述散热风道的进风口位于所述LCD光 阀 (5) 的一长边, 出风口位于所述LCD光阀 (5) 的另一长边。
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