WO2014101730A1 - 发光装置及相关投影系统 - Google Patents

发光装置及相关投影系统 Download PDF

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Publication number
WO2014101730A1
WO2014101730A1 PCT/CN2013/090216 CN2013090216W WO2014101730A1 WO 2014101730 A1 WO2014101730 A1 WO 2014101730A1 CN 2013090216 W CN2013090216 W CN 2013090216W WO 2014101730 A1 WO2014101730 A1 WO 2014101730A1
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WO
WIPO (PCT)
Prior art keywords
light
laser
emitting device
light source
spot
Prior art date
Application number
PCT/CN2013/090216
Other languages
English (en)
French (fr)
Inventor
胡飞
侯海雄
曹亮亮
Original Assignee
深圳市光峰光电技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 深圳市光峰光电技术有限公司 filed Critical 深圳市光峰光电技术有限公司
Priority to EP13866790.2A priority Critical patent/EP2940524B1/en
Priority to KR1020157015338A priority patent/KR20150082598A/ko
Priority to JP2015543284A priority patent/JP6374396B2/ja
Priority to KR1020177015510A priority patent/KR20170067905A/ko
Priority to US14/652,426 priority patent/US9612514B2/en
Publication of WO2014101730A1 publication Critical patent/WO2014101730A1/zh

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Classifications

    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V13/00—Producing particular characteristics or distribution of the light emitted by means of a combination of elements specified in two or more of main groups F21V1/00 - F21V11/00
    • F21V13/02—Combinations of only two kinds of elements
    • F21V13/08—Combinations of only two kinds of elements the elements being filters or photoluminescent elements and reflectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V5/00—Refractors for light sources
    • F21V5/04—Refractors for light sources of lens shape
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
    • G02B27/0905—Dividing and/or superposing multiple light beams
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
    • G02B27/0938—Using specific optical elements
    • G02B27/095—Refractive optical elements
    • G02B27/0955—Lenses
    • 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
    • G03B21/2006—Lamp housings characterised by the light source
    • G03B21/2033—LED or laser light sources
    • G03B21/204—LED or laser light sources using secondary light emission, e.g. luminescence or fluorescence
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
    • G02B26/007—Optical devices or arrangements for the control of light using movable or deformable optical elements the movable or deformable optical element controlling the colour, i.e. a spectral characteristic, of the light
    • G02B26/008—Optical devices or arrangements for the control of light using movable or deformable optical elements the movable or deformable optical element controlling the colour, i.e. a spectral characteristic, of the light in the form of devices for effecting sequential colour changes, e.g. colour wheels
    • 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
    • H04N9/315—Modulator illumination systems
    • H04N9/3161—Modulator illumination systems using laser light sources

Definitions

  • the present invention relates to the field of illumination and display technology, and more particularly to a light-emitting device and associated projection system. Background technique
  • Lasers have been widely used in the field of illumination and display technology in recent years due to their high brightness and high monochromaticity.
  • the light distribution of the laser is elliptical Gaussian with a large ratio of long axis to short axis, such as 10:1.
  • the source spot is required to be a rectangle having a specific aspect ratio.
  • the aspect ratio of the display screen is generally 4:3 and 16:9, so that the laser cannot be directly used as a light source for display, and the light of a plurality of lasers needs to be combined by a focusing lens to make each laser
  • the spot splicing grows to a 4:3 and 16:9 spot.
  • the projection light source in the conventional projection system includes a plurality of laser units 11, a plurality of collimator lenses 12, a focus lens 13, a phosphor 14, a substrate 15, and a motor 16.
  • the substrate 15 is fixed to the motor and rotated by the motor, and the phosphor 14 is in a ring shape coaxial with the substrate and is in close contact with the substrate 15.
  • the laser light emitted from the laser unit 11 is focused by the collimator lens 12 corresponding thereto to the focus lens 13, and is focused by the focus lens 13 onto the phosphor 14 to excite the phosphor 14.
  • the plurality of laser units 11 are divided into eight groups, and the laser light emitted from all the laser units 11 in each group is superposed on the phosphor 14 to form a spot.
  • the laser light emitted from the eight sets of laser units respectively forms eight non-coincident spots 17a on the phosphor 14, and these eight spots are superimposed on the rectangular area 17 of the phosphor 14 (target surface) to form a predetermined spot.
  • the technical problem to be solved by the present invention is to provide a light-emitting device and an associated projection system which have at least a small amount of adjustment and high assembly efficiency.
  • An embodiment of the present invention provides a light emitting device, including a light source unit, including a laser unit and a collimating lens corresponding to the laser unit, wherein the light emitting surface of the laser unit is rectangular, and a light divergence angle on a cross section of the long side of the rectangle is smaller than
  • the collimating lens is used to align the laser light from the laser unit to the focusing lens through a light divergence angle on the short side of the cross section; the focusing lens is used to focus the laser light from the collimating lens onto the target surface to form a predetermined spot;
  • the laser unit is located at a predetermined position deviating from its focus on the optical axis of the collimating lens such that the predetermined spot has a predetermined aspect ratio.
  • the illuminating device comprises a group of light source units, and the group of light source units comprises a plurality of light sources, and the same spot position on the target surface forms a predetermined spot.
  • the light emitting device further comprises a light combining device having a transmitting portion and a reflecting portion; wherein, in the two sets of light source units, the laser light emitted by the first group of light source unit groups is transmitted to the focusing lens through the transmitting portion, and the second group of the light source unit group is emitted. The laser is partially reflected by the reflection to the focus lens.
  • the light combining device comprises a slit mirror or a light transmissive sheet with a reflective strip.
  • the illuminating device further comprises an angle adjusting mechanism for adjusting the light combining device to change an incident angle of the laser light emitted from the second group of light source unit groups on the reflecting portion.
  • the distance between the laser unit and the collimating lens corresponding thereto is smaller than the focal length of the collimating lens.
  • the illuminating device further comprises a position adjusting mechanism capable of being on the optical axis of the collimating lens Linearly move the collimating lens.
  • the light emitting device further comprises a wavelength conversion layer, and the target surface is located on the wavelength conversion layer.
  • the embodiment of the invention further provides a projection system, characterized in that it comprises the above-mentioned illumination device.
  • the present invention includes the following beneficial effects:
  • the present invention allows the laser to form a predetermined spot having a predetermined aspect ratio on the target surface by arranging the laser unit at a predetermined position away from the focus of the collimator lens. Therefore, when the predetermined spot is filled with the entire predetermined rectangular area, only one set or even one laser unit needs to form the one predetermined spot, and the plurality of sets of laser units are not required to form a plurality of spots that are not coincident, thus eliminating the need for There is a technique for adjusting each group of laser units; even if a spot formed by a group of laser units cannot fill the entire rectangular area, since the spot formed when defocusing is larger than the spot formed at the focus position, relative to the prior art, In order to fill the entire rectangular area, the number of spots required is small, and the number of laser units required is small, thereby reducing the amount of adjustment of the laser unit or the collimator lens. It can be seen that the present invention has the advantages of at least a small amount of adjustment and a high assembly efficiency.
  • Figure la is a front view of a projection light source in a conventional projection system
  • Figure lb is a schematic view of the spot on the phosphor in Figure la;
  • FIG. 2a is a schematic view of a laser unit located at a focus of the collimating lens and deviated from the focus;
  • FIG. 2b is a schematic diagram of the illumination of the laser unit of FIG. 2a;
  • Figure 3a is a front elevational view of one embodiment of a light-emitting device in accordance with an embodiment of the present invention
  • Figure 3b is a schematic view of a light spot formed on a target surface in the embodiment of Figure 3a;
  • FIG. 4a is a front view of another embodiment of a light emitting device according to an embodiment of the present invention
  • FIG. 4b is a schematic view of a light spot formed on a target surface in the embodiment shown in FIG. 4a;
  • Figure 5a is a front elevational view of another embodiment of the light-emitting device of the embodiment of the present invention.
  • Figure 5b is a left side view of the light-supplied device of the embodiment of Figure 5a;
  • Aspect ratio The ratio of the major axis to the minor axis of an ellipse, or the ratio of the length to the width of a rectangular region.
  • the laser beam emitted by the laser unit forms a spot shape similar to that of the laser on the target surface.
  • the shape of the light-emitting surface of the unit is often considered by researchers in the field.
  • FIG. 2a is a schematic diagram of a laser unit located at a focal point of the collimating lens and deviated from the focus, and a schematic diagram of an elliptical spot formed by the corresponding laser on the target surface.
  • the collimating lens 220 when the laser unit 210 is located at the focus of the collimating lens 220, the collimating lens 220 is at the position A of its optical axis, and the laser light emitted from the collimating lens 220 is focused by a focusing lens (not shown).
  • the spot on the target surface is an elongated ellipse a.
  • the laser unit 210 is placed on the optical axis of the collimating lens 220 at a position deviated from its focus, for example, the collimating lens 220 is placed at a position B closer to the laser unit 210, and the laser light emitted from the collimating lens 220 passes through the focusing lens.
  • the spot focused on the target surface is an ellipse b, and the aspect ratio of b is smaller than the aspect ratio of a. If the collimating lens 220 is placed at a position A closer to the laser unit 210, the spot of the laser light emitted from the collimating lens 220 focused on the target surface by the focusing lens is an ellipse c, and the aspect ratio of c is smaller than the length of b. Width ratio. Also, the spot c almost fills the entire predetermined rectangular area 270 on the target surface.
  • the laser unit having a change in the aspect ratio of the elliptical spot on the target surface must have these Technical Features:
  • the light-emitting surface of the laser unit is rectangular, and the light divergence angle of the laser beam passing through the long side of the rectangle is smaller than the light divergence angle of the cross section passing through the short side thereof.
  • the inventors have further theoretical analysis to know the reason why the elliptical spot formed on the target surface of the laser unit changes the aspect ratio, as follows: As shown in Fig.
  • the illumination of the laser unit 210 The surface has a rectangular shape, and the light divergence angle on the cross section of the rectangular long side 211 is ⁇ , and the light divergence angle on the cross section through the rectangular short side 212 is ⁇ . Since ⁇ is smaller than ⁇ , the long axis 213 of the laser light distribution increases faster than the short axis 214 of the laser light distribution at the time of defocusing, resulting in a short axis ratio of an elliptical spot (not shown) on the target surface. The axis increases faster, so the aspect ratio of the elliptical spot changes.
  • a light-emitting device comprising: a light source unit comprising a laser unit and a collimating lens corresponding to the laser unit, the light-emitting surface of the laser unit being rectangular and passing through the long side of the rectangle The light divergence angle on the cross section is smaller than the light divergence angle on the cross section through the short side thereof, the collimating lens is used to align the laser light from the laser unit to the focusing lens;
  • a focusing lens for focusing the laser light from the collimating lens onto the target surface to form a predetermined spot
  • the laser unit is located at a predetermined position deviating from its focus on the optical axis of its corresponding collimator lens, so that the predetermined spot has a predetermined aspect ratio.
  • FIG. 3a is a front view of an embodiment of a light-emitting device according to an embodiment of the present invention
  • FIG. 3b is a schematic view of a light spot formed on a target surface in the embodiment shown in FIG. 3a.
  • the light emitting device 300 includes a light source unit 1, a focus lens 330, and wavelength conversion. Layer 340.
  • the light source unit 1 includes a laser unit 310 and a collimating lens 320 corresponding to the laser unit.
  • the laser unit 310 may be a laser generating device that produces various colors.
  • the laser unit 310 can be a laser diode that produces blue, green, or red light.
  • the light-emitting device 300 includes a group of light source units, the light source unit group includes a plurality of light source units 1; and the target surface is located on the wavelength conversion layer 340.
  • the focus lens 330 collects the laser light emitted from each of the light source unit groups onto the same spot position on the target surface to form a predetermined spot 370a, i.e., the spots formed by the laser light emitted from the respective light source units on the target surface are recombined with each other to form a predetermined spot 370a.
  • the predetermined spot 370a almost fills the entire predetermined rectangular region 370 with an aspect ratio substantially equal to the aspect ratio of the predetermined rectangular region.
  • the predetermined spot formed by each of the light source units individually fills the entire predetermined rectangular area, it is only necessary to form the one predetermined light spot 370a by using one set of light source units or even one light source unit, without forming a plurality of sets of light source units.
  • the multiple spots that do not coincide thus eliminating the adjustment of the various groups of laser units in the prior art, and improving the assembly efficiency.
  • the configurations of all the light source units 1 of a group of light source units are identical, and after designing the distance between the laser unit 310 and the collimating lens 320 according to the aspect ratio of the predetermined spot, all the light sources of the group of light source units can be The unit is arranged on the same substrate to form a light source module. After that, only the light source module and the focus lens 330 need to be adjusted, thereby greatly reducing the assembly work.
  • the laser light emitted by the laser unit 310 is blue light.
  • the wavelength conversion layer 340 is A phosphor layer, such as a YAG phosphor, which absorbs blue light and is stimulated to emit a yellow laser.
  • the wavelength conversion layer 340 may also include other wavelength converting materials such as quantum dots, fluorescent dyes, and the like having wavelength conversion capability, and is not limited to phosphors.
  • the phosphor tends to be powdery or granular, making it difficult to form a phosphor layer directly. At this time, it is necessary to use an adhesive to fix the respective phosphor particles together and form a sheet. The most common method is to disperse the phosphor in a binder, and use the binder as a carrier to carry the phosphor and form a sheet.
  • the substrate 350 has a disk shape
  • the phosphor layer 340 has an annular shape concentric with the substrate 350.
  • the light-emitting device 300 further includes a driving device 360 fixedly connected to the substrate 350 for driving the substrate 350 to rotate around its center, so that the predetermined spot formed by the laser light from the focusing lens 330 on the phosphor layer 340 acts along a circular path.
  • the driving device 360 fixedly connected to the substrate 350 for driving the substrate 350 to rotate around its center, so that the predetermined spot formed by the laser light from the focusing lens 330 on the phosphor layer 340 acts along a circular path.
  • the problem of the temperature rise of the phosphor caused by the laser light acting on the same position for a long time is avoided.
  • the driving device 360 and the phosphor layer 340 can also adopt other matching methods as long as the spot formed by the laser light from the focusing lens 330 on the phosphor layer 340 can be time-divisionally applied to different positions.
  • the phosphor layer may be in the form of a strip, and the driving device 360 may drive the substrate to move in the strip direction in a reciprocating manner.
  • the illuminating device may also include two sets of light source units to form two non-coincident spots on the target surface to superimpose a predetermined spot.
  • FIG. 4a is a front view of another embodiment of the light-emitting device in the embodiment of the present invention
  • FIG. 4b is a schematic view of the light spot formed on the target surface in the embodiment shown in FIG. 4a.
  • the light emitting device 400 includes a light source unit 1, a focus lens 430, a wavelength conversion layer 440, a substrate 450, and a driving device 460.
  • the light source unit 1 includes a laser unit 410 and a collimator lens 420 corresponding to the laser unit.
  • the difference between this embodiment and the embodiment shown in Fig. 3a is that:
  • the light emitting device 400 includes two sets of light source units, and each set of light source units includes a plurality of light source units 1.
  • the focusing lens 430 is configured to collect the laser light emitted from each of the light source unit groups in the same group of light source units to the same spot position on the target surface, and collect the laser beams emitted from the two groups of the light source unit groups to the two spot positions 470a and 470b, respectively.
  • the two spots 470a and 470b are superimposed to form a predetermined spot which almost fills the entire predetermined rectangular area 470, the aspect ratio of which is substantially equal to the aspect ratio of the predetermined rectangular area.
  • the spot formed by one set of the light source unit groups cannot fill the entire rectangular area, since the spot formed when the focus is defocused is larger than the spot formed when the focus position is formed, the present embodiment is full with respect to the prior art.
  • the number of spots required for the entire predetermined rectangular area is small, and the number of groups of light source unit groups required is also small, thereby reducing the amount of adjustment of the laser unit or the collimator lens in the light source unit group.
  • the two groups of light source units form the same spot on the target surface, and some of the edges overlap. Since the intensity of the edge of the spot is relatively weak relative to the center of the spot, by superposing the edge portions of the two spots, the predetermined spot of the superimposed composition can be made uniform.
  • the configurations of the two groups of light source units can be identical, and the two sets of light source units can be respectively disposed on different substrates to form two identical light source modules. Adjusting the substrate of the two light source modules relative to the focus transmission position.
  • the light emitting device may further include a light combining device having a transmitting portion and a reflecting portion; among the two groups of the light source unit groups, the laser light emitted by the first group of light source unit groups The transmitting portion is transmitted to the focusing lens, and the laser light emitted from the second group of the light source unit groups is reflected by the reflecting portion to the focusing lens, so that the laser light emitted from the first group of the light source unit groups is combined into a combined light.
  • a light combining device having a transmitting portion and a reflecting portion
  • FIG. 5a is a front view of another embodiment of the light-emitting device in the embodiment of the present invention
  • FIG. 5b is a left side view of the light-supplied device in the embodiment shown in FIG. 5a.
  • the light emitting device 500 includes a light source unit 1, a focus lens 530, a wavelength conversion layer 540, a substrate 550, and a driving device 560.
  • the light emitting device 500 also includes a light combining device 580.
  • the light combining device 580 is a mirror with a slit 581.
  • the laser light emitted by the first group of light source unit groups is transmitted through the slit 581 to the focus lens 530, and the laser light emitted from the second group of light source unit groups is reflected to the focus lens 530 through a portion other than the slit of the mirror. Therefore, the laser beams emitted from the two groups of light source units are combined into a single beam.
  • the angle of the mirror 580 relative to the focus lens 530 needs to be adjusted, and the two spots can be controlled to be properly superimposed to form a predetermined spot. Further, the laser light emitted from the two sets of the light source unit groups is combined by the mirror 580, and the combined light spot of the two light source unit groups can be compressed.
  • the light combining means may also be a light transmissive sheet with reflective strips.
  • the laser light emitted by the first group of light source unit groups is reflected by the reflection strip to the focus lens, and the laser light emitted from the second group of light source unit groups is transmitted to the focus lens through a portion other than the reflection strip of the light transmission sheet.
  • the light emitting device may further include an angle adjusting mechanism for adjusting the light combining means to change an incident angle of the laser light emitted from the second group of light source unit groups to the reflecting portion of the light combining means.
  • the angle adjustment mechanism can rotate the mirror 580 to change the incident angle of the laser light incident on the reflective portion of the mirror 580, thereby facilitating the user to timely change the spot on the target surface composed of the superposition of the two spots according to the change in demand.
  • the collimating lens position is moved from the ideal collimating position (ie, the position where the laser unit is located at the focus of the collimating lens) toward the laser unit, such that the distance between the laser unit and its corresponding collimating lens is less than the collimation
  • the distance of the defocus should not be too large.
  • the distance between the position of the collimated lens after defocusing and the ideal collimation position is less than 0.5 mm.
  • the light emitting device may further include a position adjusting mechanism capable of being in the collimating lens
  • the collimating lens is linearly moved on the optical axis, so that the user can timely change the aspect ratio of the spot formed by the laser light emitted from the laser unit on the target surface according to the change of the demand.
  • Embodiments of the present invention also provide a projection system including a light emitting device, which can have the structure and function in the above embodiments.
  • the projection system can employ various projection technologies, such as liquid crystal display (LCD) projection technology and digital light processor (DLP) projection technology.
  • LCD liquid crystal display
  • DLP digital light processor
  • the above-described illuminating device can also be applied to a lighting system such as stage lighting.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Astronomy & Astrophysics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Projection Apparatus (AREA)
  • Semiconductor Lasers (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

一种发光装置及相关投影系统。发光装置（300，400）包括：光源单元（1）和聚焦透镜（330，430）。光源单元（1）包括激光单元（310，410）和与激光单元（310，410）对应的准直透镜（320，420）。激光单元（310，410）的发光面为长方形，且激光经过长方形长边的截面上的光发散角小于经过其短边的截面上的光发散角。准直透镜（320，420）用于将来自激光单元（310，410）的激光聚焦至目标面上形成预定光斑。激光单元（310，410）位于准直透镜（320，420）的光轴上偏离其焦点的预定位置，以使得预定光斑具有预定的长宽比。本发光装置及相关投影系统具有调节量较少、装配效率较高的优点。

Description

发光装置 目关投影系统
技术领域
本发明涉及照明及显示技术领域， 特别是涉及一种发光装置及相关 投影系统。 背景技术
由于激光具有高亮度、 高单色性等优点， 因此近年来激光已被大量 应用于照明及显示技术领域。
激光的光分布为椭圓高斯形，其长轴与短轴的比例较大，比如 10:1。 但是在一些应用场合， 要求光源光斑为具有特定长宽比的矩形。 例如在 显示技术领域中， 显示屏的长宽比一般为 4:3和 16:9, 因此激光无法直 接作为显示用光源， 而需要通过聚焦透镜将多个激光的发光进行合光， 使各激光光斑拼接成长宽比为 4:3和 16:9的光斑。
例如， 请参阅图 la和图 lb, 图 la是现有投影系统中的投影光源的 主视图， 图 lb是图 la中荧光粉上的光斑示意图。如图 la和图 lb所示， 现有投影系统中的投影光源包括多个激光单元 11、 多个准直透镜 12、 聚焦透镜 13、 荧光粉 14、 基板 15与马达 16。 基板 15固定在马达上并 被马达带动转动， 荧光粉 14呈与基板同轴的环状并紧贴基板 15。 激光 单元 11 出射的激光经与其对应的准直透镜 12准直至聚焦透镜 13后， 经聚焦透镜 13聚焦至荧光粉 14上， 以激发荧光粉 14。 多个激光单元 11分为八组，每组中的所有激光单元 11出射的激光在荧光粉 14上形成 的光斑重合。 八组激光单元出射的激光在荧光粉 14上分别形成八个不 重合的光斑 17a, 这八个光斑在荧光粉 14 (目标面）的矩形区域 17上叠 加组成一个预定光斑。
由于需要多个光斑叠加组成预定光斑， 因此每组激光单元中， 激光 单元 11 和与其对应的准直透镜 12 两者中至少有一者在装配时需要调 节， 以使每组激光单元 11 出射的激光在荧光粉上形成的光斑在每组对 应的预定位置上， 极大地影响装配效率并且增加装配成本。 发明内容
本发明主要解决的技术问题是提供一种至少调节量较少、 装配效率 较高的发光装置及相关投影系统。
本发明实施例提供一种发光装置， 包括光源单元， 包括激光单元和 与激光单元对应的准直透镜， 该激光单元的发光面为长方形， 且经过该 长方形长边的截面上的光发散角小于经过其短边的截面上的光发散角， 该准直透镜用于将来自激光单元的激光准直至聚焦透镜； 聚焦透镜， 用 于将来自准直透镜的激光聚焦至目标面上形成预定光斑； 激光单元位于 准直透镜的光轴上偏离其焦点的预定位置， 以使得预定光斑具有预定的 长宽比。
其中， 发光装置包括一组光源单元组， 该光源单元组包括多个光源 目标面上同一个光斑位置形成预定光斑。
该发光装置包括两组光源单元组， 每组光源单元组包括多个光源单 至目标面上同一个光斑位置， 将两组光源单元组出射的激光分别聚集至 两个光斑位置， 以使得该两个光斑叠加形成预定光斑。
其中， 该发光装置还包括具有透射部分和反射部分的合光装置； 两 组光源单元组中， 第一组光源单元组出射的激光经透射部分透射至聚焦 透镜， 第二组光源单元组出射的激光经反射部分反射至聚焦透镜。
其中， 合光装置包括带狭缝的反射镜或带反射条的透光片。
其中， 该发光装置还包括角度调节机构， 用于调节合光装置， 以改 变第二组光源单元组出射的激光入射于反射部分的入射角。
其中， 激光单元和与其对应的准直透镜的距离小于该准直透镜的焦 距。
其中， 该发光装置还包括位置调节机构， 能够在准直透镜的光轴上 线性移动准直透镜。
其中，该发光装置还包括波长转换层， 目标面位于该波长转换层上。 本发明实施例还提供一种投影系统， 其特征在于， 包括上述发光装 置。
与现有技术相比， 本发明包括如下有益效果：
本发明通过将激光单元设置在偏离准直透镜焦点的预定位置， 可以 使得激光在目标面上形成具有预定长宽比的预定光斑。 因此， 当预定光 斑单个充满整个预定矩形区域时， 只需要用一组甚至一个激光单元形成 这一个预定光斑即可， 而无需多组激光单元来形成不重合的多个光斑， 因此省去了现有技术中对各组激光单元调节的环节； 即使一组激光单元 形成的光斑不能充满整个矩形区域， 由于离焦时形成的光斑比在焦点位 置时形成的光斑大， 因此相对于现有技术， 为了充满整个矩形区域而需 要的光斑数量较少， 所需要的激光单元的组数也就较少， 因此减少了对 激光单元或准直透镜的调节量。 可见， 本发明具有至少调节量较少、 装 配效率较高的优点。 附图说明
图 la是现有投影系统中的投影光源的主视图；
图 lb是图 la中荧光粉上的光斑示意图；
图 2a是激光单元位于准直透镜的焦点和偏离该焦点的结构示意图； 图 2b是图 2a中激光单元的发光示意图；
图 3a是本发明实施例中发光装置的一个实施例的主视图； 图 3b是图 3a所示实施例中目标面上形成的光斑示意图；
图 4a是本发明实施例中发光装置的另一实施例的主视图； 图 4b是图 4a所示实施例中目标面上形成的光斑示意图；
图 5a是本发明实施例中发光装置的另一实施例的主视图； 图 5b是图 5a所示实施例中合光装置的左视图； 具体实施方式
为了引用和清楚起见， 下文以及附图中使用的技术名词的说明如 下：
长宽比： 椭圓的长轴与短轴的比例， 或者是矩形区域的长与宽的比 例。
不论是将激光单元放在准直透镜的焦点上， 还是将激光单元放在准 直透镜的光轴上偏离其焦点的位置， 激光单元出射的激光在目标面上形 成的光斑形状都相似于激光单元的发光面的形状， 目前本领域的研发人 员往往会这么认为。
但是， 本发明人在实验中却发现一些激光单元放在准直透镜的光轴 上偏离其焦点的位置时， 激光单元出射的激光在目标面上形成的光斑形 状不同于激光单元位于该焦点时的光斑形状。 具体请参阅图 2a, 图 2a 是激光单元位于准直透镜的焦点和偏离该焦点的结构示意图， 以及对应 的激光在目标面上形成的椭圓光斑的示意图。
如图 2a所示， 当激光单元 210刚好位于准直透镜 220焦点时，此时 准直透镜 220位于其光轴的位置 A, 准直透镜 220出射的激光经聚焦透 镜（图未示） 聚焦在目标面上的光斑为细长条形的椭圓 a。 当激光单元 210放在准直透镜 220的光轴上偏离其焦点的位置时， 例如将准直透镜 220放在离激光单元 210较近的位置 B处， 准直透镜 220出射的激光经 聚焦透镜聚焦在目标面上的光斑为椭圓 b, b的长宽比小于 a的长宽比。 若将准直透镜 220放在离激光单元 210更近的位置 A处， 准直透镜 220 出射的激光经聚焦透镜聚焦在目标面上的光斑为椭圓 c , c的长宽比小于 b的长宽比。 并且， 光斑 c几乎充满目标面上的整个预定矩形区域 270。
经实验统计得到， 当激光单元放在准直透镜的光轴上偏离其焦点的 位置（以下简称为离焦） 时， 目标面上椭圓光斑的长宽比会发生改变的 激光单元须具有这些技术特征： 激光单元的发光面为长方形， 且激光经 过该长方形长边的截面上的光发散角小于经过其短边的截面上的光发 散角。 针对该实验结论， 发明人经过进一步的理论分析， 得知这种激光 单元在目标面上形成的椭圓光斑会改变长宽比的原因， 具体如下： 如图 2b所示， 激光单元 210的发光面为长方形， 经过该长方形长边 211的截 面上的光发散角为 α ,经过该长方形短边 212的截面上的光发散角为 β 。 由于 α小于 β , 所以在离焦时， 激光光分布的长轴 213比激光光分布的 短轴 214增大得更快， 导致目标面上的椭圓光斑（图未示） 的短轴比长 轴增大得更快， 因此椭圓光斑的长宽比发生改变。
由此可见， 通过将激光单元设置在准直透镜的光轴上偏离其焦点的 预定位置， 可以改变目标面上椭圓光斑的长宽比， 从而达到预定的长宽 比。 基于此发现， 本发明人提出以下一种发光装置， 该发光装置包括： 光源单元， 包括激光单元和与激光单元对应的准直透镜， 该激光单 元的发光面为长方形， 且经过该长方形长边的截面上的光发散角小于经 过其短边的截面上的光发散角， 该准直透镜用于将来自该激光单元的激 光准直至聚焦透镜；
聚焦透镜， 用于将来自准直透镜的激光聚焦至目标面上形成预定光 斑；
并且， 激光单元位于与其对应的准直透镜的光轴上偏离其焦点的预 定位置， 以使得预定光斑具有预定的长宽比。
与现有技术相比， 本发明通过将激光单元设置在偏离准直透镜焦点 的预定位置， 可以使得激光在目标面上形成具有预定长宽比的预定光 斑。 因此， 当预定光斑单个充满整个预定矩形区域时， 只需要用一组甚 至一个激光单元形成这一个预定光斑即可， 而无需多组激光单元来形成 不重合的多个光斑， 因此省去了现有技术中对各组激光单元调节的环 节； 即使一组激光单元形成的光斑不能充满整个矩形区域， 由于离焦时 形成的光斑比在焦点位置时形成的光斑大， 因此相对于现有技术， 为了 充满整个矩形区域而需要的光斑数量较少， 所需要的激光单元的组数也 就较少， 因此减少了对激光单元或准直透镜的调节量。 可见， 本发明具 有至少调节量较少、 装配效率较高的优点。
下面结合附图和实施方式对本发明实施例进行详细说明。
实施例一
请参阅图 3a与图 3b, 图 3a是本发明实施例中发光装置的一个实施 例的主视图， 图 3b是图 3a所示实施例中目标面上形成的光斑示意图。 如图 3a所示， 发光装置 300包括光源单元 1、 聚焦透镜 330、 波长转换 层 340。光源单元 1包括激光单元 310和与激光单元对应的准直透镜 320。 激光单元 310可以为产生各种颜色的激光产生器件。 例如， 激光单 元 310可以为产生蓝光、 绿光或红光的激光二极管。
每一个激光单元 310, 都有一个对应的准直透镜 320, 用于将来自 激光单元 310的激光准直至聚焦透镜 330。 准直透镜 320优选为非球面 准直透镜， 此时准直效果较好。 准直透镜 320也可以为球面准直透镜或 自由曲面准直透镜。
本实施例中， 发光装置 300包括一组光源单元组， 该光源单元组包 括多个光源单元 1 ; 并且， 目标面位于波长转换层 340上。 聚焦透镜 330 将光源单元组中的各个光源单元出射的激光聚集至目标面上同一个光 斑位置形成预定光斑 370a, 即各个光源单元出射的激光在目标面上形成 的光斑相互重合成预定光斑 370a。 预定光斑 370a几乎充满整个预定矩 形区域 370, 其长宽比大致等于预定矩形区域的长宽比。
本实施例中， 矩形区域 370与图 lb所示的矩形区域 17相同， 并且 各光学元件的配置与图 la所示的也相同， 4叚设图 lb中单个光斑的长宽 比为 a:b, 矩形区域 17的长与单个光斑的长的比例为 1.5; 那么本实施 例中经过离焦后， 单个光斑充满了整个矩形区域 370。 结合图 lb 与图 3b可知， 本实施例中单个光斑的长宽比为（1.5a)/(6b)=a/(4b)。 由此可见， 本实施例中经过离焦后， 单个光斑的长宽比缩小了 4倍。
本实施例中， 由于每个光源单元形成的预定光斑单个充满整个预定 矩形区域， 因此只需要用一组光源单元甚至一个光源单元形成这一个预 定光斑 370a即可， 而无需多组光源单元来形成不重合的多个光斑， 因此 省去了现有技术中对各组激光单元调节的环节， 提高了装配效率。
优选地， 一组光源单元组的所有光源单元 1的配置均一致， 在根据 预定光斑的长宽比设计好激光单元 310与准直透镜 320的距离之后， 可 以将一组光源单元组的所有光源单元设置在同一个基板上形成一个光 源模组。 此后只需要调节该光源模组、 聚焦透镜 330即可， 因此大大减 少了装配工作量。
本实施例中， 激光单元 310出射的激光为蓝光。 波长转换层 340为 荧光粉层， 例如 YAG荧光粉， 它可以吸收蓝光并受激发射黄色的受激 光。 波长转换层 340也可以包括其它波长转换材料， 例如量子点、 荧光 染料等具有波长转换能力的材料， 并不限于荧光粉。 在很多情况下， 荧 光粉往往是粉末状或颗粒状的， 难以直接形成荧光粉层。 此时就需要使 用一种粘接剂把各个荧光粉颗粒固定在一起， 并形成片层状。 最常用的 方法是将荧光粉分散于一种粘结剂中， 利用粘结剂作为载体来承载荧光 粉并形成片层状。
由于荧光粉层通常较为脆弱易破碎， 因此优选地， 发光装置 300还 包括基板 350, 用于承载荧光粉层 340。 具体可以通过粘贴、 涂覆等方 式将荧光粉层 340设置在基板 350上。 当然， 在荧光粉层的刚性足够的 条件下， 例如将荧光粉掺入刚性足够的透明玻璃中形成的荧光粉层， 也 可以不设置基板来承载荧光粉层。
更进一步地， 基板 350呈圓盘状， 荧光粉层 340呈与基板 350同心 的圓环状。 并且， 发光装置 300还包括驱动装置 360, 与基板 350固定 连接， 用于驱动基板 350绕其圓心转动， 以使得来自聚焦透镜 330的激 光在荧光粉层 340上形成的预定光斑沿圓形路径作用于荧光粉层， 以避 免激光长时间作用于同一位置的荧光粉导致的该荧光粉温度升高的问 题。 容易理解的是， 驱动装置 360与荧光粉层 340也可以采用其它配合 方式， 只要能够实现来自聚焦透镜 330的激光在荧光粉层 340上形成的 光斑能够分时作用于不同位置即可。 例如， 荧光粉层可以呈带状， 驱动 装置 360可以驱动基板以往复运动的形式沿该带状方向移动。
实施例二
发光装置也可以包括两组光源单元组， 以在目标面上形成两个不重 合的光斑以叠加组成预定光斑。 具体请参阅图 4a与图 4b, 图 4a是本发 明实施例中发光装置的另一实施例的主视图， 图 4b是图 4a所示实施例 中目标面上形成的光斑示意图。如图 4a所示，发光装置 400包括光源单 元 1、 聚焦透镜 430、 波长转换层 440、 基板 450与驱动装置 460。 光源 单元 1包括激光单元 410和与激光单元对应的准直透镜 420。
本实施例与图 3a所示实施例的区别之处在于： 发光装置 400包括两组光源单元组， 每组光源单元组包括多个光源 单元 1。 并且， 聚焦透镜 430用于将同组光源单元组中的各个光源单元 出射的激光聚集至目标面上同一个光斑位置， 将两组光源单元组出射的 激光分别聚集至两个光斑位置 470a与 470b。 两个光斑 470a与 470b叠 加形成预定光斑， 该预定光斑几乎充满整个预定矩形区域 470, 该预定 光斑的长宽比大致等于预定矩形区域的长宽比。
本实施例中， 虽然一组光源单元组形成的光斑不能充满整个矩形区 域， 但由于离焦时形成的光斑比在焦点位置时形成的光斑大， 因此本实 施例相对于现有技术， 为了充满整个预定矩形区域而需要的光斑数量较 少， 所需要的光源单元组的组数也就较少， 因此减少了对光源单元组中 激光单元或准直透镜的调节量。
进一步地， 如图 4b 所示， 两组光源单元组在目标面上形成的光斑 相同， 且有部分边缘交叠。 由于光斑边缘的强度相对光斑中央的较弱， 因此通过叠加两个光斑的边缘部分， 可以使得叠加组成的预定光斑较均 匀。
由于两组光源单元组所形成的光斑相同， 因此两组光源单元组的配 置可以一致， 可以将两组光源单元组分别设置在不同基板上形成两个相 同的光源模组， 此时只需要分别调整两个光源模组的基板相对于聚焦透 位置。
实施例三
为了便于调节图 4实施例所示的两组光源单元组， 发光装置还可以 包括具有透射部分和反射部分的合光装置； 该两组光源单元组中， 第一 组光源单元组出射的激光经透射部分透射至聚焦透镜， 第二组光源单元 组出射的激光经反射部分反射至聚焦透镜， 从而与第一组光源单元组出 射的激光合为一束合光。 此时只需要调节合光装置相对于聚焦透镜的角 度， 即可调节被反射部分反射的激光的角度， 进而调节被反射的激光在 目标面上形成的光斑与被透射的激光在目标面上形成的光斑的相对位 置。 具体请参阅图 5a与图 5b, 图 5a是本发明实施例中发光装置的另一 实施例的主视图， 图 5b是图 5a所示实施例中合光装置的左视图。 如图 5a所示，发光装置 500包括光源单元 1、聚焦透镜 530、波长转换层 540、 基板 550与驱动装置 560。
本实施例与图 4a所示实施例的区别之处在于：
发光装置 500还包括合光装置 580。 如图 5b所示， 合光装置 580为 带狭缝 581的反射镜。 两组光源单元组中， 第一组光源单元组出射的激 光经狭缝 581透射至聚焦透镜 530, 第二组光源单元组出射的激光经反 射镜的狭缝以外的部分反射至聚焦透镜 530, 从而两组光源单元组出射 的激光合为一束合光。 如上分析， 此时只需要调节反射镜 580相对于聚 焦透镜 530的角度，即可控制两个光斑进行合适的叠加以形成预定光斑。 并且， 通过反射镜 580对两组光源单元组出射的激光进行合光， 还可以 压缩两组光源单元组的合光的光斑。
容易理解的是， 在其它实施例中， 合光装置也可以为带反射条的透 光片。 此时两组光源单元组中， 第一组光源单元组出射的激光经反射条 反射至聚焦透镜， 第二组光源单元组出射的激光经透光片的反射条以外 的部分透射至聚焦透镜。
进一步地，发光装置还可以包括角度调节机构，用于调节合光装置， 以改变第二组光源单元组出射的激光入射于合光装置的反射部分的入 射角。例如角度调节机构可以旋转反射镜 580,以改变入射于反射镜 580 的反射部分的激光的入射角， 从而便于用户根据需求的改变而适时地改 变目标面上由两个光斑叠加组成的光斑。
以上各实施例中， 并未对具体如何离焦进行说明。 优选地， 将准直 透镜位置从理想准直位置 (即使得激光单元位于准直透镜焦点的位置） 向激光单元的方向移动， 即使得激光单元和与其对应的准直透镜的距离 小于该准直透镜的焦距， 此时准直透镜收集光的角度更大， 光利用率较 高。 离焦的距离不宜过大， 优选地， 离焦后的准直透镜的位置与理想准 直位置之间的距离小于 0.5mm。
进一步地， 发光装置还可以包括位置调节机构， 能够在准直透镜的 光轴上线性移动准直透镜， 以便于用户根据需求的改变而适时地改变激 光单元出射的激光在目标面上形成的光斑的长宽比。
本说明书中各个实施例采用递进的方式描述， 每个实施例重点说明 的都是与其他实施例的不同之处， 各个实施例之间相同相似部分互相参 见即可。
本发明实施例还提供一种投影系统， 包括发光装置， 该发光装置可 以具有上述各实施例中的结构与功能。 该投影系统可以采用各种投影技 术， 例如液晶显示器（LCD, Liquid Crystal Display )投影技术、 数码光 路处理器（DLP, Digital Light Processor )投影技术。 此外， 上述发光装 置也可以应用于照明系统， 例如舞台灯照明。
以上所述仅为本发明的实施方式， 并非因此限制本发明的专利范 围， 凡是利用本发明说明书及附图内容所作的等效结构或等效流程变 换， 或直接或间接运用在其他相关的技术领域， 均同理包括在本发明的 专利保护范围内。

Claims

权 利 要 求 书
1、 一种发光装置， 其特征在于， 包括：
光源单元， 包括激光单元和与激光单元对应的准直透镜， 该激光单 元的发光面为长方形， 且经过该长方形长边的截面上的光发散角小于经 过其短边的截面上的光发散角， 该准直透镜用于将来自所述激光单元的 激光准直至聚焦透镜；
聚焦透镜， 用于将来自所述准直透镜的激光聚焦至目标面上形成预 定光斑；
所述激光单元位于所述准直透镜的光轴上偏离其焦点的预定位置， 以使得所述预定光斑具有预定的长宽比。
2、 根据权利要求 1 所述的发光装置， 其特征在于， 该发光装置包 括一组光源单元组， 该光源单元组包括多个光源单元； 光聚集至目标面上同一个光斑位置形成所述预定光斑。
3、 根据权利要求 1 所述的发光装置， 其特征在于， 该发光装置包 括两组光源单元组， 每组光源单元组包括多个光源单元； 光聚集至目标面上同一个光斑位置， 将两组光源单元组出射的激光分别 聚集至两个光斑位置， 以使得该两个光斑叠加形成所述预定光斑。
4、 根据权利要求 3 所述的发光装置， 其特征在于， 该发光装置还 包括具有透射部分和反射部分的合光装置；
所述两组光源单元组中， 第一组光源单元组出射的激光经所述透射 部分透射至所述聚焦透镜， 第二组光源单元组出射的激光经所述反射部 分反射至所述聚焦透镜。
5、 根据权利要求 4 所述的发光装置， 其特征在于， 所述合光装置 包括带狭缝的反射镜或带反射条的透光片。
6、 根据权利要求 4 所述的发光装置， 其特征在于， 该发光装置还 包括角度调节机构， 用于调节所述合光装置， 以改变第二组光源单元组 出射的激光入射于所述反射部分的入射角。
7、 根据权利要求 1 所述的发光装置， 其特征在于， 所述激光单元 和与其对应的准直透镜的距离小于该准直透镜的焦距。
8、 根据权利要求 1 所述的发光装置， 其特征在于， 该发光装置还 包括位置调节机构， 能够在准直透镜的光轴上线性移动所述准直透镜。
9、 根据权利要求 1 所述的发光装置， 其特征在于， 该发光装置还 包括波长转换层， 所述目标面位于该波长转换层上。
10、 一种投影系统， 其特征在于， 包括如权利要求 1至 9中任一项 所述的发光装置。
PCT/CN2013/090216 2012-12-28 2013-12-23 发光装置及相关投影系统 WO2014101730A1 (zh)

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