WO2013063835A1 - Dlp微型投影机 - Google Patents

Dlp微型投影机 Download PDF

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Publication number
WO2013063835A1
WO2013063835A1 PCT/CN2011/082991 CN2011082991W WO2013063835A1 WO 2013063835 A1 WO2013063835 A1 WO 2013063835A1 CN 2011082991 W CN2011082991 W CN 2011082991W WO 2013063835 A1 WO2013063835 A1 WO 2013063835A1
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WO
WIPO (PCT)
Prior art keywords
light
led chip
lens group
color led
vertical
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Application number
PCT/CN2011/082991
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English (en)
French (fr)
Inventor
杨伟梁
高志强
赵远
Original Assignee
广景科技有限公司
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Publication of WO2013063835A1 publication Critical patent/WO2013063835A1/zh

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3102—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators
    • H04N9/3111—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators for displaying the colours sequentially, e.g. by using sequentially activated light sources
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS 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
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/2006—Lamp housings characterised by the light source
    • G03B21/2013—Plural light sources
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS 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
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/2006—Lamp housings characterised by the light source
    • G03B21/2033—LED or laser light sources
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS 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
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/2066—Reflectors in illumination beam
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS 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
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/208—Homogenising, shaping of the illumination light
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS 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
    • G03B33/00—Colour photography, other than mere exposure or projection of a colour film
    • G03B33/10—Simultaneous recording or projection
    • G03B33/12—Simultaneous recording or projection using beam-splitting or beam-combining systems, e.g. dichroic mirrors
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3141—Constructional details thereof
    • H04N9/3173—Constructional details thereof wherein the projection device is specially adapted for enhanced portability

Definitions

  • the present invention relates to the field of digital projection display technology, and more particularly to a DLP pico projector. Background technique
  • DMD (Dig i ta l Mi cromi rror Dev ice ) is a light modulation device developed by TI Corporation of the United States. It can control the micro-mirror array with extremely high reflectivity and can project the three primary colors (RGB) with the projection optical system.
  • the screen, the projector using this device is generally called DLP (Dig i ta l Light Projector) projector.
  • DLP Dig i ta l Light Projector
  • This technology shows great advantages in terms of flow brightness, video image display and contrast ratio compared to conventional LCD projectors.
  • a DLP-based projection system includes signal reception and processing functions, a DLP projection optomechanical module, and supports an all-digital approach.
  • Elements of the DLP Projector module include a light source, a cooling system, signal modulation DMD devices, and projection optics.
  • a DMD can be simply described as a semiconductor optical switch. Thousands of tiny square lenses are constructed on the hinge structure above the static access memory to form a DMD. Each lens can turn on and off one pixel of light.
  • the hinge structure allows the lens to be tilted between two states, +10 degrees being “on”. -10 degrees is "off", when the lenses are not working, they are in a 0 degree “parking" state.
  • the current DLP projector module should be applied to handheld electronic devices, and it is necessary to achieve a small size while maintaining a high light output.
  • optical path and heat dissipation structure in the optical device also require detailed design, and the production cost of the overall optical machine must also be considered to meet the application of the portable electronic device.
  • one of the objects of the present invention is to provide a DLP micro projector based on a DMD device in order to reduce its size.
  • Another object of the present invention is to provide a DLP micro projector based on a DMD device to solve the problem of reduced light transmission efficiency which may be caused by a reduction in size of the projector.
  • a DLP micro projector comprising a light supply device, an optical path conversion device, a DLP light modulator and a projection lens device, the light supply device comprising an LED light source and a vertical alignment a direct lens group, a horizontal collimating lens group and a beam splitting lens group;
  • the LED light source comprises a first color LED chip, a second color LED chip and a third color LED chip, wherein the first color LED chip and the second color LED chip are horizontal Arranging and having a central optical axis of a vertical shape, the central optical axis of the third color LED chip is horizontal and coincides with a central optical axis of the optical path changing device;
  • the central optical axis of the vertical collimating lens group is vertical
  • the vertical lens group is disposed above the first color LED chip and the second color LED chip for receiving natural light from the first color LED chip and the second color LED chip and homogenizing the light;
  • the horizontal alignment The central optical axis of the lens group is horizontal and coincides with
  • the central optical axis of the vertical collimating lens group and the central optical axis of the first color LED chip, the central optical axis of the second color LED chip or the first color LED chip and the The vertical optical axes at the midpoint of the two-color LED chip connection coincide.
  • the central optical axis of the vertical collimating lens group and the vertical optical axis at the midpoint of the line connecting the first color LED chip and the second color LED chip coincide.
  • the horizontal collimating lens group and the vertical collimating lens group receive natural light emitted by the LED light source and emit light of approximately parallel light having a divergence of less than 20°.
  • the horizontal collimating lens group and the vertical collimating lens group receive natural light emitted by the LED light source and emit light of approximately parallel light having a divergence of less than 15°.
  • the optical path conversion device includes a fly-eye lens group, a mirror, a condenser lens, and a prism disposed along the optical path, for receiving light from the light supply device and guiding the same to the DLP optical modulator.
  • the mirror is provided with an angle adjustment device.
  • the projection lens device comprises a first lens, a second lens and a third lens arranged along the optical path, the second lens and the third lens being aspherical plastic lenses, and the first lens is a plastic lens.
  • the angle between the central optical axis of the fly-eye lens group and the central optical axis of the projection lens group in the optical path conversion device is less than 60°.
  • the angle between the central optical axis of the fly-eye lens group and the central optical axis of the projection lens group in the optical path conversion device is less than 45.
  • the DLP optical modulator is a DMD.
  • the DLP pico projector according to the present invention can greatly reduce the size of the light supply device due to the unique structure of the light supply device, and if the central optical axis of the fly-eye lens group and the central optical axis of the projection lens group are further Set to a parallel state, the overall size of the DLP pico projector can be greatly reduced.
  • the projection lens set of the DLP micro projector of the present invention adopts a plastic lens, and two of the lenses are aspherical lenses, which not only reduces the length of the projection lens, but also greatly reduces the cost of the lens and reduces the projection.
  • the weight of the lens is not only reduces the length of the projection lens, but also greatly reduces the cost of the lens and reduces the projection.
  • the DLP micro projector of the present invention sets the light source to a horizontal state portion and a vertical state portion, respectively, so that the heat dissipation effect is good.
  • DRAWINGS 1 is a schematic structural view of a DLP micro projector according to the present invention. Description of the reference signs:
  • 1-level LED light source 2-first collimating lens, 3-second collimating lens, 4-third collimating lens, 5-fourth collimating lens, 6-vertical LED light source, 7-first minute Chromatic mirror, 8-second dichroic mirror, 9 - compound eye array lens, 10 - fourth lens, 11 - mirror, 12 - converging lens, 13 - prism, 14-DMD, 15 - first lens, 16 - Two lenses, 17 - third lens.
  • the present invention will be described in detail with reference to the accompanying drawings and preferred embodiments thereof, but it is understood that the scope of the invention is not limited by the specific embodiments.
  • 1 is a schematic structural view of a DLP micro projector according to the present invention.
  • the DLP pico projector includes a light supply device, an optical path conversion device, a DMD 14 and a projection lens device.
  • the light supply device comprises a horizontal LED light source 1, a vertical collimating lens group, a vertical LED light source 6, a horizontal collimating lens group and a spectroscopic lens group.
  • the horizontal LED light source 1 is disposed on a horizontal surface and its central optical axis is vertical.
  • a straight red LED chip and a blue LED chip, the vertical LED light source 6 is a green LED chip whose center optical axis is horizontal and coincides with the central optical axis of the optical path changing device.
  • a vertical collimating lens group is disposed above the horizontal LED light source 1 and includes a first collimating lens 2 and a second collimating lens 3 which are arranged from bottom to top and whose central optical axes coincide, the central optical axis of the vertical collimating lens group
  • the vertical optical axis at the midpoint of the line connecting the red LED chip and the blue LED chip is coincident, and the vertical collimator lens group is required to transmit light with a divergence of less than 15° for receiving natural light from the horizontal LED light source 1
  • the light is collimated into approximately parallel light, and the specific parameters of the vertical collimating lens group can be calculated by more technical requirements of those skilled in the art.
  • the horizontal collimating lens group is disposed on the right side of the vertical LED light source 6, and includes a fourth collimating lens 5 and a third collimating lens 4 which are arranged from left to right and whose central optical axes coincide, and the central light of the horizontal collimating lens group
  • the axis coincides with the optical axis of the green LED chip, and the transmitted light of the horizontal collimating lens group
  • the projection light of the vertical collimating lens group intersects perpendicularly, and the horizontal collimating lens group is required to have a divergence of transmitted light of less than 15° for receiving natural light from the vertical LED light source 6 and homogenizing the light into approximately parallel light.
  • the specific parameters of the horizontal collimating lens group can be calculated by more technical requirements of those skilled in the art, or can be the same as the parameters of the vertical collimating lens group.
  • the spectroscopic lens group is disposed at the intersection of the transmitted light of the vertical collimating lens group and the horizontal collimating lens group, and includes a first dichroic mirror 7 and a second dichroic mirror 8 disposed in order from top to bottom, wherein, the second The dichroic mirror 8 reflects red light and transmits green light and blue light.
  • the first dichroic mirror ⁇ reflects blue light and transmits red light and green light, so that the green light emitted by the vertical LED light source 6 can penetrate the first minute in the horizontal direction.
  • the color mirror 7 and the second dichroic mirror 8 are incident on the optical path conversion device, and those skilled in the art can perform corresponding calculations according to the parameters of the collimator lens group to obtain the first dichroic mirror 7 and the second dichroic mirror.
  • the setting angle of 8 is such that the blue light reflected by the first dichroic mirror ⁇ and the red light reflected by the second dichroic mirror 8 are reflected in the horizontal direction into the optical path converting device.
  • the optical path conversion device includes a fly-eye lens group disposed along the optical path, a mirror 11, a converging lens 12, and a prism 13 for receiving light from the light supply device and guiding it to the DLP light modulator, the fly-eye lens
  • the group includes a compound eye array lens 9 and a fourth lens 10 whose central optical axes are coincident, and the central optical axis of the fly-eye lens group is parallel to the reflected light of the spectroscopic lens group, and the mirror 11 is provided with an angle adjusting device for finely adjusting the reflected light.
  • the converging lens 12 and the prism 13 receive the reflected light from the mirror 11 and guide it onto the DMD 14.
  • the optical path conversion device of the present invention replaces the conventional light bar design and reduces the size of the optical path conversion device.
  • the projection lens arrangement is adapted to receive light modulated by the DMD 14 and to project an image, which uses a telecentric optical path design to increase the optical aperture of the projection lens arrangement.
  • the projection lens device includes a first lens 15, a second lens 16, and a third lens 17 disposed along the optical path, wherein the second lens 16 and the third lens 17 are aspherical plastic lenses, which can reduce the length of the lens.
  • the first lens 15, the second lens 16, and the third lens 17 are both plastic lenses, which are formed by an injection molding process, which can greatly reduce the cost and the weight of the lens.
  • the central optical axis of the projection lens device can be set to be parallel to the central optical axis of the fly-eye lens group.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Optics & Photonics (AREA)
  • Projection Apparatus (AREA)

Abstract

一种DLP微型投影机，该投影机供光装置的光源被设为水平装置（1）和竖直装置（6）。对应水平装置和竖直装置分别设置一个水平准直透镜组（2、3）和一个竖直准直透镜组（4、5）。沿竖直准直透镜组的光路依序设置两个反射不同色光的分光镜片（7、8）。光源发出的三种色光可以相互平行的入射到后面的光学部件中。所述的DLP微型投影机不仅可以减小投影机的尺寸，还能解决因投影机尺寸减小所可能带来的光传导效率降低的问题。

Description

DLP微型投影机 技术领域 本实用新型涉及数字投影显示技术领域，更具体的说是涉及一种 DLP 微型投影机。 背景技术
DMD ( Dig i ta l Mi cromi rror Dev ice )是美国 TI公司开发的光线调 制器件， 其透过控制反射率极高的微型反射镜阵列， 配合投影光学*** 能投射出由三原色 （RGB )构成的画面， 使用此器件的投影机一般称为 DLP ( Dig i ta l Light Projector )投影机。 该技术比传统的 LCD投影机 在流明亮度、 视频影像显示及对比度方面都显示出很大的优越性。 一个 DLP为基础的投影***包括信号接收及处理功能、 DLP投影光机模组并支 持全数字方法。 DLP投影光机模组的元素包括一个光源、 一个冷却***、 信号调制 DMD器件及投影光学元件。 一个 DMD可被简单描述成为一个半 导体光开关。 成千上万个微小的方形镜片， 被建造在静态随 取内存 上方的铰链结构上而组成 DMD。 每一个镜片可以通断一个象素的光。 铰 链结构允许镜片在两个状态之间倾斜， +10度为"开"。 -10度为"关"， 当 镜片不工作时， 它们处于 0度"停泊"状态。 目前的 DLP投影机模组要应用在手持式电子设备中， 就要在保持具 有高的光输出的条件下实现小尺寸， 为了实现合适的尺寸除了对投影光 路的设计要简洁高效外， 对于供光装置中的光路和散热结构也需要进行 详细设计， 同时也要考虑整体光机的生产成本， 以满足手提式电子设备 的应用。
实用新型内容 为满足投影机在手持式电子设备中的应用， 本实用新型的目的之一 在于提供一种基于 DMD器件的 DLP微型投影机， 以便减小其尺寸大小。 本实用新型另一目的在于提供一种基于 DMD器件的 DLP微型投影机， 以解决因投影机尺寸减小所可能带来的光传导效率降低的问题。 本实用新型是采用如下技术方案来实现上述目的： 一种 DLP微型投 影机， 包括供光装置、 光路转换装置、 DLP 光调制器和投影镜头装置， 该供光装置包括有 LED光源、 竖直准直透镜组、 水平准直透镜组和分光 镜片组； 该 LED光源包括第一色 LED芯片、 第二色 LED芯片和第三色 LED芯 片， 该第一色 LED芯片、 第二色 LED芯片呈水平排列且其中心光轴为竖 直状， 该第三色 LED芯片的中心光轴为水平状且与光路装换装置的中心 光轴重合； 该竖直准直透镜组的中心光轴为竖直状， 且该竖直透镜组设置在第 一色 LED芯片与第二色 LED芯片上方， 用以接收来自第一色 LED芯片与 第二色 LED芯片的自然光并将光线均匀化； 该水平准直透镜组的中心光轴为水平状且与第三色 LED芯片的中心 光轴重合， 用以接收来自第三色 LED芯片的自然光并将光线均勾化， 该 水平透镜組的透射光与该竖直透镜组的投射光垂直相交； 该分光镜片组包括依序设置的第一分色镜和第二分色镜， 该第一分 色镜反射第一色 LED芯片的光并透射第二 LED芯片和第三色 LED芯片的 光， 该第二分色镜反射第二色 LED芯片的光并透射第一 LED芯片和第三 色 LED芯片的光， 用以实现将第一色 LED芯片和第二色 LED芯片所发出 的光以水平状反射到光路转换装置中， 将第三色 LED芯片所发出的光以 水平状透射到光路转换装置中。 作为上述方案的进一步说明： 优选地， 所述竖直准直透镜組的中心光轴和第一色 LED芯片的中心 光轴、 第二色 LED芯片的中心光轴或第一色 LED芯片与第二色 LED芯片 连线的中点处的竖直光轴重合。 优选地， 所述竖直准直透镜組的中心光轴和第一色 LED芯片与第二 色 LED芯片连线的中点处的竖直光轴重合。 优选地， 所述水平准直透镜組和竖直准直透镜組接受 LED光源发出 的自然光后发出的光线均为发散度小于 20° 的近似平行光。 优选地， 所述水平准直透镜組和竖直准直透镜組接受 LED光源发出 的自然光后发出的光线均为发散度小于 15° 的近似平行光。 优选地， 所述光路转换装置包括沿光路依序设置的复眼透镜组、 反 射镜、 会聚透镜及棱镜， 用于接受来自供光装置的光并将其均勾引导到 DLP光调制器上， 该反射镜设有角度调节装置。 优选地， 所述投影镜头装置包括沿光路依序设置的第一透镜、 第二 透镜和第三透镜， 该第二透镜和第三透镜为非球面塑料透镜， 该第一透 镜为塑料透镜。 优选地， 所述光路转换装置中复眼透镜组的中心光轴与投影镜头组 的中心光轴的夹角小于 60° 。 优选地， 所述光路转换装置中复眼透镜组的中心光轴与投影镜头组 的中心光轴的夹角小于 45。 。 优选地， 所述 DLP光调制器为 DMD。 本实用新型采用以上技术方案所能达到的有益效果是：
1. 本实用新型所述的 DLP微型投影机，因其供光装置的特有结构， 可大大减小供光装置的尺寸， 若再将复眼透镜组的中心光轴与投影镜头 组的中心光轴设置成平行状态， 则可大大减小 DLP微型投影机的整体尺 寸。
2. 本实用新型所述 DLP 微型投影机的投影镜头组因采用塑料镜 片， 且其中两个透镜为非球面镜片， 不仅减小了投影镜头的长度， 大大 降低了镜头的成本， 也减轻了投影镜头的重量。
3. 本实用新型所述的 DLP微型投影机， 将光源分别设为水平状态 部分和竖直状态部分， 因此散热效果较好。 附图说明 图 1是本实用新型所述的 DLP微型投影机的结构示意图。 附图标记说明：
1-水平 LED光源， 2-第一准直透镜， 3-第二准直透镜， 4-第三准直 透镜， 5-第四准直透镜， 6-竖直 LED光源， 7-第一分色镜， 8-第二分色 镜， 9 -复眼阵列透镜， 10 -第四透镜， 11 -反射镜， 12 -会聚透镜， 13 -棱 镜， 14-DMD, 15 -第一透镜， 16 -第二透镜， 17 -第三透镜。 具体实施方式 为进一步阐述本实用新型的结构和功能， 以下结合附图和优选的实 施例对本实用新型作详细说明， 但应当理解本实用新型的保护范围并不 受具体实施方式的限制。 图 1是本实用新型所述的 DLP微型投影机的结构示意图， 如图中所 示， 该 DLP微型投影机包括供光装置、 光路转换装置、 DMD14和投影镜 头装置。 供光装置包括有水平 LED光源 1、竖直准直透镜組、竖直 LED光源 6、 水平准直透镜組和分光镜片组， 该水平 LED光源 1为设置在水平面上且 其中心光轴为竖直状的红光 LED芯片和蓝光 LED芯片， 该竖直 LED光源 6为中心光轴呈水平状且与光路装换装置的中心光轴重合的绿光 LED芯 片。 竖直准直透镜組设置在水平 LED光源 1上方， 包括由下至上排列且 中心光轴重合的第一准直透镜 2和第二准直透镜 3， 该竖直准直透镜组 的中心光轴与红光 LED芯片和蓝光 LED芯片连线的中点处的竖直光轴重 合， 且要求该竖直准直透镜組透射光的发散度小于 15° ， 用以接收来自 水平 LED光源 1的自然光并将光线均勾化为近似平行光， 该竖直准直透 镜组的具体参数可由本领域技术人员更具设计要求计算得出。 水平准直透镜組设置在竖直 LED光源 6右方， 包括由左至右排列且 中心光轴重合的第四准直透镜 5和第三准直透镜 4， 该水平准直透镜组 的中心光轴与绿光 LED芯片的光轴重合， 该水平准直透镜组的透射光与 该竖直准直透镜组的投射光垂直相交， 且要求该水平准直透镜組透射光 的发散度小于 15° ， 用以接收来自竖直 LED光源 6的自然光并将光线均 匀化为近似平行光， 该水平准直透镜組的具体参数可由本领域技术人员 更具设计要求计算得出， 也可与竖直准直透镜組的参数相同。 分光镜片组设置在竖直准直透镜组和水平准直透镜组的透射光相交 处， 包括由上至下依序设置的第一分色镜 7和第二分色镜 8， 其中， 第 二分色镜 8反射红光而透射绿光和蓝光， 第一分色镜 Ί反射蓝光而透射 红光和绿光， 这样， 竖直 LED光源 6发出的绿光可以沿水平方向穿透第 一分色镜 7和第二分色镜 8而入射到光路转换装置中， 本领域技术人员 再根据准直透镜组的参数进行相应的计算， 即可得到第一分色镜 7和第 二分色镜 8的设置角度， 以使第一分色镜 Ί反射的蓝光和第二分色镜 8 反射的红光沿水平方向反射到光路转换装置中。 光路转换装置包括沿光路依序设置的复眼透镜组、 反射镜 11、 会聚 透镜 12及棱镜 13， 用于接受来自供光装置的光并将其均勾引导到 DLP 光调制器上， 该复眼透镜组包括中心光轴重合的复眼阵列透镜 9和第四 透镜 10， 且该复眼透镜组的中心光轴与分光镜片组的反射光平行， 该反 射镜 11设有角度调节装置， 用以微调反射光的角度， 该会聚透镜 12和 棱镜 13接受反射镜 11的反射光并将其引导到 DMD14上。 本实用新型所 述的光路转换装置替换了常用的光棒设计，减小了光路转换装置的尺寸。 投影镜头装置用以接受经过 DMD14调制的光并投影成像， 它使用远 心光路设计以增大投影镜头装置的光学孔径。 该投影镜头装置包括沿光 路依序设置的第一透镜 15、 第二透镜 16和第三透镜 17， 其中该第二透 镜 16和第三透镜 17为非球面塑料透镜， 这样可以减小镜头长度， 而且 该第一透镜 15、 第二透镜 16和第三透镜 17均为塑料材质的透镜， 采用 注塑工艺成型， 这样既能大大降低成本也能减轻镜头重量。 为进一步减 小投影机的尺寸， 可将投影镜头装置的中心光轴设为与复眼透镜组的中 心光轴平行。 本实用新型上述实施例和附图所示仅为本实用新型较佳实施例之 一， 并不能以此局限本实用新型， 在不脱离本实用新型精髓的条件下， 本领域技术人员所做的任何变动， 都属本实用新型的保护范围

Claims

权 利 要 求 书
1. 一种 DLP微型投影机， 包括供光装置、 光路转换装置、 DLP光调 制器和投影镜头装置， 该供光装置包括有 LED光源、 竖直准直透镜組、 水平准直透镜组和分光镜片组； 该 LED光源包括第一色 LED芯片、 第二色 LED芯片和第三色 LED芯 片， 该第一色 LED芯片、 第二色 LED芯片呈水平排列且其中心光轴为竖 直状， 该第三色 LED芯片的中心光轴为水平状且与光路装换装置的中心 光轴重合； 该竖直准直透镜组的中心光轴为竖直状， 且该竖直透镜组设置在第 一色 LED芯片与第二色 LED芯片上方， 用以接收来自第一色 LED芯片与 第二色 LED芯片的自然光并将光线均匀化； 该水平准直透镜组的中心光轴为水平状且与第三色 LED芯片的中心 光轴重合， 用以接收来自第三色 LED芯片的自然光并将光线均勾化， 该 水平透镜組的透射光与该竖直透镜组的投射光垂直相交； 该分光镜片组包括依序设置的第一分色镜和第二分色镜， 该第一分 色镜反射第一色 LED芯片的光并透射第二 LED芯片和第三色 LED芯片的 光， 该第二分色镜反射第二色 LED芯片的光并透射第一 LED芯片和第三 色 LED芯片的光， 用以实现将第一色 LED芯片和第二色 LED芯片所发出 的光以水平状反射到光路转换装置中， 将第三色 LED芯片所发出的光以 水平状透射到光路转换装置中。
2. 根据权利要求 1所述的 DLP微型投影机， 其特征在于， 所述竖直 准直透镜組的中心光轴和第一色 LED芯片的中心光轴、 第二色 LED芯片 的中心光轴或第一色 LED芯片与第二色 LED芯片连线的中点处的竖直光 轴重合。
3. 根据权利要求 1或 2所述的 DLP微型投影机， 其特征在于， 所述 竖直准直透镜組的中心光轴和第一色 LED芯片与第二色 LED芯片连线的 中点处的竖直光轴重合。
4. 根据权利要求 1所述的 DLP微型投影机， 其特征在于， 所述水平 准直透镜組和竖直准直透镜組接受 LED光源发出的自然光后发出的光线 均为发散度小于 20° 的近似平行光。
5. 根据权利要求 4所述的 DLP微型投影机， 其特征在于， 所述水平 准直透镜組和竖直准直透镜組接受 LED光源发出的自然光后发出的光线 均为发散度小于 15° 的近似平行光。
6. 根据权利要求 3所述的 DLP微型投影机， 其特征在于， 所述光路 转换装置包括沿光路依序设置的复眼透镜组、反射镜、会聚透镜及棱镜， 用于接受来自供光装置的光并将其均匀引导到 DLP光调制器上， 该反射 镜设有角度调节装置。
7. 根据权利要求 6所述的 DLP微型投影机， 其特征在于， 所述投影 镜头装置包括沿光路依序设置的第一透镜、 第二透镜和第三透镜， 该第 二透镜和第三透镜为非球面塑料透镜， 该第一透镜为塑料透镜。
8. 根据权利要求 1或 5所述的 DLP微型投影机， 其特征在于， 所述 光路转换装置中复眼透镜組的中心光轴与投影镜头组的中心光轴的夹角 小于 60° 。
9. 根据权利要求 8所述的 DLP微型投影机， 其特征在于， 所述光路 转换装置中复眼透镜组的中心光轴与投影镜头组的中心光轴的夹角小于
45° 。
1 0. 根据权利要求 1所述的 DLP微型投影机，其特征在于，所述 DLP 光调制器为 DMD。
PCT/CN2011/082991 2011-11-03 2011-11-25 Dlp微型投影机 WO2013063835A1 (zh)

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