CN111413842B - Illumination light path and laser projection equipment - Google Patents
Illumination light path and laser projection equipment Download PDFInfo
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- CN111413842B CN111413842B CN201910009439.3A CN201910009439A CN111413842B CN 111413842 B CN111413842 B CN 111413842B CN 201910009439 A CN201910009439 A CN 201910009439A CN 111413842 B CN111413842 B CN 111413842B
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- 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
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- 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
- G03B21/005—Projectors using an electronic spatial light modulator but not peculiar thereto
- G03B21/008—Projectors using an electronic spatial light modulator but not peculiar thereto using micromirror devices
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- 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
- G03B21/206—Control of light source other than position or intensity
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- 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
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Projection Apparatus (AREA)
Abstract
The invention discloses an illumination light path and laser projection equipment, and relates to the technical field of light source processing. The problem that the size of an illumination light path of an existing laser projection device in the direction perpendicular to an optical axis is large is solved. The illumination light path comprises a light source, and a color filter wheel, a light guide pipe and a fly eye lens which are sequentially arranged along the light emitting direction of the light source, wherein the area of a first end of the light guide pipe along the axial direction is smaller than that of a second end of the light guide pipe, the color filter wheel is arranged on one side of the first end of the light guide pipe, the fly eye lens is arranged on one side of the second end of the light guide pipe, the area of the fly eye lens is larger than or equal to that of the second end of the light guide pipe, and the radius of the color filter wheel is larger than the maximum distance between two radial points parallel to the color filter wheel of the first end of the light guide pipe and smaller than the maximum distance between two radial points parallel to the color filter wheel of the fly eye lens. The illumination optical path of the present invention is used to illuminate the digital micromirror wafer.
Description
Technical Field
The invention relates to the technical field of light source processing, in particular to an illumination light path and laser projection equipment.
Background
Laser display projection technology is an emerging projection display technology, and laser projection equipment has higher brightness and longer service life compared with LED projection equipment. However, the volume of the existing laser projection device is large, for example, the dodging element in the laser display projection device is a fly eye lens, and in order to ensure the color filtering effect of the whole light spot irradiated on the fly eye lens, half of the color filtering wheel is required to at least shield the whole fly eye lens, so that the size of the color filtering wheel required to be adopted is large, the size of the illumination light path of the laser display projection device perpendicular to the optical axis is large, and the application of the laser projection device is limited.
Disclosure of Invention
The invention provides an illumination light path and laser projection equipment, which are used for solving the problem that the size of the illumination light path of the existing laser projection equipment along the direction vertical to an optical axis is larger.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the invention provides an illumination light path, which includes a light source, and a color filter wheel, a light guide pipe and a fly eye lens that are sequentially arranged along a light emitting direction of the light source, wherein an area of a first end of the light guide pipe along an axial direction is smaller than an area of a second end of the light guide pipe, the color filter wheel is arranged on one side of the first end of the light guide pipe, the fly eye lens is arranged on one side of the second end of the light guide pipe, an area of the fly eye lens is larger than or equal to an area of the second end of the light guide pipe, and a radius of the color filter wheel is larger than a maximum distance between two points of the first end of the light guide pipe in a radial direction parallel to the color filter wheel, and is smaller than a maximum distance between two points of the fly eye lens in a radial direction parallel to the color filter wheel.
In a second aspect, the present invention provides a laser projection apparatus, including the illumination optical path described in the above technical solution.
Compared with the prior art, the light guide pipe and the fly eye lens are adopted for light uniformization, and the light uniformizing effect of the illumination light path can be improved by additionally arranging the light guide pipe; and when the color filter wheel is arranged on one side of the first end of the light guide pipe along the axial direction and the fly eye lens is arranged on one side of the second end of the light guide pipe along the axial direction, the color filter wheel is designed to have a size which only needs to ensure that half of the color filter wheel can completely shield the first end of the light guide pipe, so that the color filtering of light rays entering the first end of the light guide pipe can be realized, compared with the prior art that half of the color filter wheel at least shields the whole fly eye lens, because the area of the first end of the light guide pipe along the axial direction is smaller than that of the second end in the embodiment of the invention, and the area of the fly eye lens is larger than or equal to that of the second end of the light guide pipe, namely the area of the first end of the light guide pipe is smaller than that of the fly eye lens, therefore, the radius of the color filter wheel adopted by the illumination light path of the invention can meet the requirements that the maximum distance between the first end of the light guide pipe and the two points in the radial direction parallel to the color filter wheel is larger than that of the fly eye lens, the radius of the color filter wheel is smaller, and the size of the color filter wheel is reduced, so that the size of an illumination light path and the size of the laser projection equipment in the direction perpendicular to the optical axis are reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a fly-eye lens in an illumination optical path according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a fly-eye lens including two single fly-eye lenses in an illumination optical path according to an embodiment of the invention;
FIG. 3 is a schematic structural diagram of an illumination light path according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of an optical path of an illumination light path according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; may be a mechanical connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.
In the description of the present invention, "and/or" is only one kind of association relationship describing an association object, and means that there may be three kinds of relationships, for example, a and/or B, and may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
The utility model provides an illumination light path includes the light source, and along the colour wheel of filtering, light pipe and the lens subassembly that light source outgoing direction set gradually, the area that the light pipe goes into the plain noodles is less than the area of play plain noodles, filters the colour wheel and sets up in the income plain noodles one side of light pipe, and the great light beam angle of light beam angle that follow the light source and shoot out gets into the reflection in the light pipe back, and the light beam angle of outgoing light is less, realizes dodging and collimation to light.
Referring to fig. 1 to 4, an illumination light path according to an embodiment of the present invention includes a light source, a color filter wheel, a light guide tube 1, and a fly eye lens 2, which are sequentially disposed along a light emitting direction of the light source, where an area of a first end 11 of the light guide tube 1 along an axial direction is smaller than an area of a second end 12, the color filter wheel is disposed on a side of the first end 11 of the light guide tube 1, the fly eye lens 2 is disposed on a side of the second end 12 of the light guide tube 1, an area of the fly eye lens 2 is greater than or equal to an area of the second end 12 of the light guide tube 1, and a radius of the color filter wheel is greater than a maximum distance between two radial points of the first end 11 of the light guide tube 1, and is smaller than a maximum distance between two radial points of the fly eye lens 2, which are parallel to the color filter wheel.
Compared with the prior art, the light guide pipe 1 and the fly eye lens 2 are adopted for light uniformization of the illumination light path provided by the invention, and the light uniformization effect of the illumination light path can be improved by additionally arranging the light guide pipe 1; and when the color filter wheel is disposed at one side of the first end 11 of the light conduit 1 along the axial direction, and the fly eye lens 2 is disposed at one side of the second end 12 of the light conduit 1 along the axial direction, the size of the color filter wheel is designed to ensure that only half of the color filter wheel can completely shield the first end 11 of the light conduit 1, so as to filter the light entering the first end 11 of the light conduit 1, compared with the prior art in which at least half of the color filter wheel is required to shield the whole fly eye lens 2, because the area of the first end 11 of the light conduit 1 along the axial direction is smaller than the area of the second end 12 in the embodiment of the present invention, and the area of the fly eye lens 2 is larger than or equal to the area of the second end 12 of the light conduit 1, that is the area of the first end 11 of the light conduit 1 smaller than the area of the fly eye lens 2, therefore, the radius of the color filter wheel adopted by the illumination light path of the present invention satisfies the condition that the maximum distance between two points of the first end 11 of the light conduit 1 in the radial direction parallel to the color filter wheel, And the maximum distance between two points of the fly-eye lens 2 in the radial direction parallel to the color filter wheel is smaller, the radius of the color filter wheel is smaller, the volume of the color filter wheel is reduced, and the size of the illumination light path in the direction vertical to the optical axis is reduced.
In addition, compared with the above-mentioned illumination light path that only uses the light guide 1 for light homogenization, the light guide 1 needs to ensure that the light can be reflected for multiple times after entering the light guide 1, and the length of the light guide 1 is long, but in the embodiment of the present invention, the light guide 1 and the fly eye lens 2 are combined for light homogenization, and the light can be emitted after being reflected once after entering the light guide 1, and after the secondary light homogenization through the fly eye, the light homogenization effect can be ensured to be good, so the light guide 1 with short length can be used in the embodiment of the present invention, and the length of the illumination light path along the optical axis direction is shortened.
Optionally, the light guide 1 is a tapered light guide, and both the first end and the second end of the tapered light guide are rectangular; or the light guide 1 is a profiled light guide, the opposite light guide having a first end 11 which is circular and a second end 12 which is rectangular. The light guide 1 used in the embodiment of the present invention is a tapered light guide because the latter is difficult to process and expensive. In addition, the light guide 1 may be a solid light guide or a hollow light guide. The light guide 1 according to the embodiment of the present invention is a hollow light guide because the hollow light guide has a low cost.
Taking the example where the beam angle of the light beam entering the first end 11 of the light guide 1 is 28 °, the beam angle of the light beam exiting the second end 12 of the light guide 1 is 8 °, the light guide 1 is a tapered light guide, and the first end 11 and the second end 12 of the light guide 1 are both rectangular, the long side on the first end 11 of the light guide 1 is 2X, the short side on the first end 11 of the light guide 1 is 2Y, the long side on the second end 12 of the light guide 1 is 2X, and the short side on the second end 12 of the light guide 1 is 2Y, according to the etendue formula: 2X · sin28 ° -2X · sin8 °, 2Y · sin28 ° -2Y · sin8 °, it can be deduced:
Therefore, if the radius of the color filter wheel in the illumination light path for homogenizing light only by using the light guide tube and the radius of the color filter wheel in the illumination light path for homogenizing light by using the embodiment of the invention are both r, the radius of the color filter wheel in the illumination light path for homogenizing light only by using the fly eye lens in the prior art should be more than 3.4 r. For the illumination light path which only adopts the light guide pipe 1 to homogenize light, the length of the light guide pipe 1 adopted by design at least needs to ensure that the light can be reflected for more than 3 times after entering, and the length of the light guide pipe 1 in the embodiment of the invention only needs to ensure that the light can be reflected once after entering, so that compared with the prior art, the radius of the color filter wheel in the illumination light path adopting the embodiment of the invention can be reduced by 2.4 r; compared with the above-mentioned illumination light path for light homogenization only by using the light guide 1, the length of the light guide 1 in the illumination light path according to the embodiment of the present invention can be shortened 2/3.
In some embodiments, the fly-eye lens 2 is a double fly-eye lens; in other embodiments, the fly-eye lens 2 includes two single fly-eye lenses, the planes of the two single fly-eye lenses are disposed oppositely, and the two single fly-eye lenses may be attached to each other or disposed at an interval. Above-mentioned two schemes, all can guarantee to the even light effect of illumination light path better, have high homogeneity.
Alternatively, the axis of the light guide 1 may coincide with the center line of the fly-eye lens 2, or the axis of the light guide 1 may not coincide with the center line of the fly-eye lens 2. In order to ensure the dodging effect, in the latter scheme, the width of the fly-eye lens 2 on one radial side of the light guide pipe 1 is larger, so that the size of the fly-eye lens 2 is larger, and the volume of an illumination light path is increased. Therefore, in the embodiment of the present invention, the axis of the light guide 1 coincides with the center line of the fly-eye lens 2.
The too large distance S between the light guide 1 and the fly-eye lens 2 may result in a large length of the illumination light path along the axial direction of the light guide 1, and the too small distance S between the light guide 1 and the fly-eye lens 2 may result in interference between the light guide 1 and the fly-eye lens 2 if the distance S between the light guide 1 and the fly-eye lens 2 is less than 3 mm. Therefore, in the embodiment of the present invention, the distance S between the light guide 1 and the fly-eye lens 2 is 3mm or more, for example, S is 3mm, 4mm, or 5 mm.
Similarly, if the length L1 of the light guide 1 in the axial direction is too large, the length of the illumination light path in the axial direction of the light guide 1 is too large, and the volume of the illumination light path is increased; if the length L1 of the light guide 1 in the axial direction is too small, the light guide 1 has a poor light-equalizing effect. Therefore, the axial length L1 of the light guide 1 in the embodiment of the present invention ranges from 15mm to 20mm, for example, L1 is 15mm, 17mm, 19mm, or 20 mm.
For the above solution that the fly-eye lens 2 is a double fly-eye lens, if the thickness T1 of the double fly-eye lens is too large, for example, the thickness T1 of the double fly-eye lens is greater than 8mm, the size of the illumination light path in the thickness direction of the double fly-eye lens is increased; if the thickness T1 of the binocular lens is too small, for example, the thickness T1 of the binocular lens is less than 5mm, the light-homogenizing effect is poor. Therefore, the thickness T1 of the above fly-eye lens ranges from 5 to 8mm, for example, T1 is 5mm, 6mm, 7mm, or 8 mm.
Similarly, for the scheme that the fly-eye lens 2 comprises two single fly-eye lenses, and the planes of the two single fly-eye lenses are arranged oppositely, the thicknesses of the two single fly-eye lenses can be the same or different; the two single fly-eye lenses may be the same in shape and size or different in shape and thickness, for example, the two single fly-eye lenses are the same in shape and thickness, and the thickness T2 of each single fly-eye lens is 2mm or more.
Based on the above embodiment, the cross section of the fly-eye lens 2 may be rectangular. If the number of compound eyes in the compound eye lens 2 is too large, the transmittance of the compound eye lens 2 is affected; if the number of compound eyes in the compound eye lens 2 is too small, the light uniformity of the compound eye lens 2 is poor. Therefore, the number of compound eyes in the compound eye lens 2 in the embodiment of the present invention is 7 × 9.
In order to avoid the overlarge axial size of the illumination light path along the light guide 1, the illumination light path further comprises a reflector 3, the reflector 3 is arranged on the light emitting side of the fly eye lens 2, the transmission direction of the light rays is changed through the reflector 3, and therefore the axial size of the illumination light path along the light guide 1 is reduced.
The illumination light path further comprises a convex lens 4, the convex lens 4 is arranged on the light emergent side of the fly eye lens 2, and the convex lens 4 can be used for correcting distortion. The number of the convex lenses 4 is two, and the two convex lenses 4 are respectively arranged on the light incident side and the light emergent side of the reflector 3, so that the distortion correction effect is good.
Optionally, the two convex lenses 4 are both spherical convex lenses; or one convex lens 4 is a spherical convex lens, the other convex lens 4 is an aspherical convex lens, and the convex lens 4 arranged on the light-emitting side of the reflector 3 in fig. 3 is an aspherical convex lens. The two schemes have better correction effect on phase difference, the cost of the two schemes is lower, and the aspheric convex lens of the two schemes can correct spherical aberration.
Further, in order to compensate the optical path difference of the light beam in the transmission process, the illumination optical path further comprises a prism 5, and the prism 5 is arranged on the light-emitting side of the reflector 3. The prism 5 may be a Total Internal Reflection (TIR) prism, and light emitted from the prism 5 irradiates on a DMD (Digital Micromirror Device) chip to generate a sharper light spot, which is not easy to generate a dark band. And for the solution with two convex lenses 4, the prism 5 is arranged between the convex lens 4 on the light exit side of the mirror 3 and the DMD chip.
The embodiment of the present invention further includes a laser projection device, including the illumination light path described in the above embodiment, because the illumination light path installed in the laser projection device of this embodiment is the same as the illumination light path provided in the above embodiments, the two can solve the same technical problem and achieve the same expected effect, and the length of the light pipe 1 is smaller and the radius of the color filter wheel is also smaller, so that the volume of the laser projection device is smaller, and the application range is wider.
Further, the laser projection device further comprises a lens and a digital micromirror wafer 6, wherein the digital micromirror wafer 6 is positioned between the light-emitting side of the fly-eye lens 2 and the lens, and the digital micromirror wafer 6 is provided with a protective glass 7; each fly-eye of the fly-eye lens 2 is rectangular, the cross section of the fly-eye lens 2 is also rectangular or parallelogram, and the length 2a and the width 2b of the fly-eye respectively satisfy the following conditions:
wherein θ is the beam angle of the light exit side of the light guide 1, m is the number of compound eyes in each row of the compound eye lens 2, n is the number of compound eyes in each row of the compound eye lens 2, L is half of the length of the digital micromirror wafer 6, W is half of the width of the digital micromirror wafer 6, z is the single-side reserved size of the digital micromirror wafer 6, F is the focal length of the lens, # is the clear aperture of the lens, and F/# is the F-number of the lens.
Taking the beam angle θ on the light outgoing side of the light guide 1 as 8 ° as an example, the fly-eye lens 2 adopts 7 × 9, that is, the number m of fly-eyes in each row of the fly-eye lens 2 is 9, the number n of fly-eyes in each column of the fly-eye lens 2 is 7, the F/# of the lens is 2, the DMD wafer 6 is 0.47DMD, that is, half L of the length of the DMD wafer 6 is 5.184mm, half W of the width of the DMD wafer 6 is 2.916, and the single-side reserved dimension z is 0.4mm, and the length 2a of a single fly-eye in the fly-eye lens 2 is 2.85mm and the width 2b of a single fly-eye is 1.7mm, as calculated by the above formula.
The particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (8)
1. A laser projection device comprising an illumination light path;
The illumination light path comprises a light source, and a color filter wheel, a light guide pipe and a fly eye lens which are sequentially arranged along the light emitting direction of the light source, wherein the area of a first end of the light guide pipe along the axial direction is smaller than that of a second end of the light guide pipe, the color filter wheel is arranged on one side of the first end of the light guide pipe, the fly eye lens is arranged on one side of the second end of the light guide pipe, the area of the fly eye lens is larger than or equal to that of the second end of the light guide pipe, the radius of the color filter wheel is larger than the maximum distance between two radial points of the first end of the light guide pipe, which are parallel to the color filter wheel, and is smaller than the maximum distance between two radial points of the fly eye lens, which are parallel to the color filter wheel;
laser projection equipment still includes camera lens and digital micromirror wafer, digital micromirror wafer is located fly-eye lens's light-emitting side with between the camera lens, every fly-eye in the fly-eye lens is the rectangle, fly-eye lens's cross-section is rectangle or parallelogram, the length 2a of fly-eye with the width 2b of fly-eye satisfies respectively:
wherein θ is a beam angle of the light exit side of the light guide, m is a number of compound eyes in each row of the compound eye lens, n is a number of compound eyes in each row of the compound eye lens, L is a half of the length of the dmd wafer, W is a half of the width of the dmd wafer, z is a single-side reserved size of the dmd wafer, F is a focal length of the lens, # is a light transmission aperture of the lens, and F/# is an F-number of the lens.
2. A laser projection device as claimed in claim 1, wherein the light guide is a tapered light guide.
3. The laser projection device of claim 1 or 2, wherein the fly-eye lens is a double fly-eye lens; or the fly-eye lens comprises two single fly-eye lenses, and planes of the two single fly-eye lenses are oppositely arranged.
4. A laser projection device as claimed in claim 1 or 2, characterized in that the axis of the light guide coincides with the center line of the fly-eye lens.
5. The laser projection apparatus according to claim 1, wherein a distance between the light guide and the fly-eye lens is 3mm or more.
6. The laser projection device of claim 1, wherein the length of the light guide tube along the axial direction has a value in a range of 15-20 mm.
7. A laser projection device as claimed in claim 3, wherein the fly-eye lens configured as a double fly-eye has a thickness in the range of 5-8 mm.
8. The laser projection apparatus according to claim 3, wherein a thickness of each single fly-eye lens of the fly-eye lenses is 2mm or more.
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| TWI418920B (en) * | 2011-03-31 | 2013-12-11 | Young Optics Inc | Projection apparatus |
| JP2017044870A (en) * | 2015-08-26 | 2017-03-02 | 株式会社リコー | Image display device and image display unit |
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|---|---|---|---|---|
| CN1522384A (en) * | 2002-05-14 | 2004-08-18 | ���ṫ˾ | Illuminating optical system, image display unit and method of illuminating space modulation element |
| CN101303291A (en) * | 2008-06-05 | 2008-11-12 | 苏州大学 | Multi-channel multi-target ultra-optical spectrum imaging method and system based on digital micro lens device |
| TW201441754A (en) * | 2013-04-20 | 2014-11-01 | Appotronics China Corp | A lighting device and a projection system |
| CN103957437A (en) * | 2014-04-26 | 2014-07-30 | 吉安英佳电子科技有限公司 | Wireless servo portable high-integration digital multimedia all-in-one machine |
| CN204086786U (en) * | 2014-08-06 | 2015-01-07 | 深圳市玛卡光电科技有限公司 | A kind of relay lens assemblies for projection lighting optical path |
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