CN1242290C - Light beam energy distribution homogenizing optical assembly - Google Patents
Light beam energy distribution homogenizing optical assembly Download PDFInfo
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- CN1242290C CN1242290C CN 03151055 CN03151055A CN1242290C CN 1242290 C CN1242290 C CN 1242290C CN 03151055 CN03151055 CN 03151055 CN 03151055 A CN03151055 A CN 03151055A CN 1242290 C CN1242290 C CN 1242290C
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- immersion lens
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- straight collimator
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Abstract
The present invention relates to a homogenizing optical subassembly which can cause light energy of light beams to be uniformly distributed. The present invention comprises a non-parabolic reflecting mirror and a straight light pipe. The present invention is characterized in that both end surfaces of the straight light pipe are respectively provided with a plano-convex hemispheric immersion lens which is connected with the straight light into a whole; light beams emitted by the light source are coupled in the straight light pipe through the first plano-convex hemispheric immersion lens through the reflection of the non-parabolic reflecting mirror and are irradiated by the second plano-convex hemispheric immersion lens on the emergence end surface of the light pipe for homogenizing the light beams. The present invention increases reflecting angles, reduces the core diameter of the straight light pipe and shortens the length of the straight light pipe by the intermediate image immersed technique; the present invention has the largest advantage that the present invention shortens the length of the optical subassembly being favorable to reducing the manufacturing difficulty of the straight light pipe.
Description
Technical field
The present invention relates to optical element, specifically be meant a kind of homogenizing optical module that light beam luminous energy is evenly distributed.
Background technology
In light engine, for the light beam luminous energy that the outgoing light source is sent is evenly distributed, the distribution that the total reflection principle of transmission-type straight collimator commonly used comes homogenizing light beam luminous energy, the effect of luminous energy homogenizing is directly proportional with the order of reflection of light beam in straight collimator, order of reflection and the light reflection angle in straight collimator is inversely proportional to, be inversely proportional to the core diameter of straight collimator, reflection angle is determined by beam incident angle usually.See Fig. 1, the light beam that light source 1 ' sends is through the reflection of catoptron 2 ', converge to the end face of straight collimator 3 ' with aperture angle U (angle of incident beam and systematic optical axis), because the end face of straight collimator 3 ' is the plane, therefore incident angle I is exactly aperture angle U, obtains refraction angle I ' (being the angle of straight collimator inner light beam and systematic optical axis) in straight collimator by refraction law:
SinI’＝SinI/N。
Because total reflection occurs on the side of straight collimator, is obtained by geometric relationship:
β＝90°-I’。
Refraction angle I ' because of the refractive index N value of straight collimator greater than air refraction, so I ' diminishes, so light becomes big at the internal reflection angle β of straight collimator.Because the change of reflection angle β is big, every reflection axial distance once also becomes big, therefore to reach certain order of reflection, way in the past is that the length of straight collimator is done length, so just strengthened the size of instrument, also increased simultaneously manufacturing cost, as this unconventional optical element processing growth size of straight collimator certain degree of difficulty has been arranged especially.
Technical scheme
The purpose of this invention is to provide a kind ofly under the condition that does not change light source parameters, and do not prolong under the situation of straight collimator length, can improve the equally distributed homogenizing optical module of light beam luminous energy.
Homogenizing optical module technical scheme of the present invention is: by the technology of intermediary image submergence, increase reflection angle, reduce the straight collimator core diameter, improve order of reflection not changing under the length situation of straight collimator.
Homogenizing optical module of the present invention comprises: non-parabolic mirror 2, straight collimator 4 is characterized in that: the biend at straight collimator respectively has a plano-convex hemisphere immersion lens that links into an integrated entity by optical cement and straight collimator.The light that light source 1 sends is through the reflection of non-parabolic mirror 2, be coupled in the straight collimator 4 by the first plano-convex hemisphere immersion lens 3, through the second plano-convex hemisphere immersion lens, 5 outgoing of straight collimator 4 outgoing end faces, the centre of sphere of the first plano-convex hemisphere immersion lens 3 is positioned at the position of source reflection picture.The refractive index of the said first plano-convex hemisphere immersion lens is identical with the straight collimator refractive index.
The principle of work of homogenizing optical module of the present invention is: the light that sends when light source 1 is through the reflection of non-parabolic mirror 2, when inciding the first plano-convex hemisphere immersion lens 3, this moment, incident ray overlapped with the normal of sphere, and incident angle I equals zero, so refraction angle I ' also equals zero:
I’＝I＝0，
Compare with existing structure, the angle of light and systematic optical axis does not become in the straight collimator, when the refractive index n of the first plano-convex hemisphere immersion lens is identical with straight collimator refractive index N, equals aperture angle U, and light diminishes at the internal reflection angle β of straight collimator,
β＝90°-U，
Because U is greater than I, reflection angle β diminishes, and every reflection axial distance once also diminishes, and under therefore identical at order of reflection and the situation that the straight collimator core diameter is constant, can shorten the length of straight collimator.
By the Lagrange invariant law:
J＝N
iη
iSiN∪
i
Can obtain the size of hemisphere immersion lens as d:
d＝η/N＝a/n，
Compare with existing structure, because of hemisphere submergence mirror image d dwindles n doubly, the core diameter of straight collimator also dwindles N doubly.Increased the order of reflection under the situation of straight collimator finite length so more.
The present invention has following beneficial effect:
1. homogenizing optical module of the present invention can reduce the size of modular construction greatly, particularly shortens the length of straight collimator.
2. the shortening of straight collimator length helps reducing the manufacture difficulty of straight collimator.
3. the paired use of hemisphere immersion lens, making the parameter constant of emergent ray does not influence the optical design of system.
4. the hemisphere immersion lens is connected by the optical cement gummed with straight collimator, does not increase the loss of luminous energy.
Description of drawings
Fig. 1 is existing homogenizing optical module figure;
Fig. 2 is homogenizing optical module figure of the present invention.
Embodiment
Homogenizing optical assembly structure shown in 2 with reference to the accompanying drawings, we have designed an embodiment:
The E23 mercury lamp of choosing Philips company is as light source, and its aperture angle is
u＝46.88°，
Image height
η＝3.88，
Plano-convex hemisphere immersion lens material selects K9, its refractive index
n＝1.5136，
Can obtain image height in hemisphere submergence mirror according to Lagrange invariant
d＝η/N＝3.88/1.5136＝2.563，
The image height that the diameter of straight collimator equals 2 times,
2d＝2×2.563＝5.168，
The material of straight collimator is identical with the hemisphere immersion lens, draws the reflection angle of light beam in straight collimator
β＝90°-U＝90°-46.88°＝43.12°。
If light beam straight collimator internal reflection number of times C=4 time, can be calculated the length of straight collimator by the geometric relationship among the figure
L＝C×d×tan(β)＝4×2.563×tan(43.12°)＝9.6。
If according to the structural design of existing homogenizing optical module, the image height that the diameter of straight collimator equals 2 times
2d＝2η＝2×3.88＝7.76
Refraction angle sine in straight collimator
SinI’＝(SinI)/N＝Sin(46.88°)/1.5136＝0.4822，
Corresponding angle U=28.83 °, draw the internal reflection angle of light at straight collimator
β＝90°-U＝90°-28.83°＝61.17°
The length of straight collimator
L＝C×d×tan(β)＝4×3.887×tan(61.17°)＝28.25。
The length that the length of as seen existing optical module is longer than optical module of the present invention greatly.
Claims (1)
1. homogenizing optical module that light beam luminous energy is evenly distributed, comprising: non-parabolic mirror (2), straight collimator (4) is characterized in that:
Biend at straight collimator (4) respectively has a plano-convex hemisphere immersion lens that links into an integrated entity by optical cement and straight collimator; The light that light source (1) sends is through the reflection of non-parabolic mirror (2), be coupled in the straight collimator (4) by the first plano-convex hemisphere immersion lens (3), through second plano-convex hemisphere immersion lens (5) outgoing of straight collimator (4) outgoing end face, the centre of sphere of the first plano-convex hemisphere immersion lens (3) is positioned at the position of source reflection picture; The refractive index of the said first plano-convex hemisphere immersion lens is identical with the straight collimator refractive index.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03151055 CN1242290C (en) | 2003-09-18 | 2003-09-18 | Light beam energy distribution homogenizing optical assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03151055 CN1242290C (en) | 2003-09-18 | 2003-09-18 | Light beam energy distribution homogenizing optical assembly |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1527096A CN1527096A (en) | 2004-09-08 |
| CN1242290C true CN1242290C (en) | 2006-02-15 |
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ID=34286881
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03151055 Expired - Fee Related CN1242290C (en) | 2003-09-18 | 2003-09-18 | Light beam energy distribution homogenizing optical assembly |
Country Status (1)
| Country | Link |
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| CN (1) | CN1242290C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101368872B (en) * | 2007-08-13 | 2011-01-26 | 杭州锐力光学有限公司 | LED luminous flux measurement apparatus and method |
| JP2013505465A (en) * | 2009-09-22 | 2013-02-14 | サイバーオプティクス コーポレーション | High-speed, high-resolution 3D solar cell inspection system |
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2003
- 2003-09-18 CN CN 03151055 patent/CN1242290C/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| CN1527096A (en) | 2004-09-08 |
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