CN108775553B - Lens and light source module - Google Patents
Lens and light source module Download PDFInfo
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- CN108775553B CN108775553B CN201810630267.7A CN201810630267A CN108775553B CN 108775553 B CN108775553 B CN 108775553B CN 201810630267 A CN201810630267 A CN 201810630267A CN 108775553 B CN108775553 B CN 108775553B
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- light
- light incident
- lens
- point
- incident surface
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- 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
Abstract
The invention discloses a lens and a light source module, wherein the lens is of an axisymmetric structure, the inner surface of the lens comprises a first light incident part and a second light incident part, the second light incident part comprises a first light incident surface and a second light incident surface, the first light incident surface is connected between the first light incident part and the second light incident surface, the first light incident surface and the second light incident surface are both planes, the second light incident surface is inclined towards a direction far away from an axis, the absolute value of the inclination of the second light incident surface is between 0.36 and 2.75, and the relative distance between a point and b point in the axis direction is greater than 1/2 of the relative distance between a point and c point in the axis direction. The lens provided by the invention enables the incidence angle of all incident light rays which are emitted by the central point of the light emitting unit and are incident on the second light incident surface to be smaller than 20 degrees based on the arrangement of the position, the height and the slope of the second light incident surface, so that the problem of Fresnel reflection on the second light incident surface is avoided, and the problem of bright rings on the outer circle of a light spot of the conventional TIR lens is solved.
Description
Technical Field
The invention belongs to the technical field of illumination, and particularly relates to a lens and a light source module.
Background
The TIR lens is short for total internal reflection lens, which receives the light from the light source and totally emits the light after total internal reflection. TIR lenses are widely used in lighting systems such as searchlight, flashlights, and the like.
Currently, the TIR small angle lens (beam angle is less than or equal to 12 degrees) on the market has the inner surface with inclined surfaces on the side surface. Light rays exiting such lenses can cause significant bright ring problems at the outer ring of the center spot due to fresnel reflections. To improve this problem, the solutions currently in common use are: 1. the light emergent surface is frosted or is subjected to microstructure and other treatment modes, but the light beam angle is increased, the central light intensity is reduced, and the effect of small angle and high light intensity cannot be achieved; 2. the lens is large in size, so that the beam angle meets the requirement, the lens light-emitting surface is frosted or micro-structured, and finally the purpose of small angle and high light intensity is achieved, but the size of the lamp body is increased by increasing the size of the lens, so that the problem of a small-power large-size lamp can be solved.
On the premise that the beam angle and the central light intensity meet the requirements and the size of the lens is not changed, the problem that the bright ring appears on the outer circle of the light spot of the lens is solved, and the problem to be solved by technicians in the industry is urgently solved.
Disclosure of Invention
The invention aims to solve the problems, and provides a lens which solves the problem of a bright ring of a facula outer ring of the lens on the premise that the beam angle and the central light intensity meet the requirements and the size of the lens is not changed.
In order to achieve the above object, the present invention provides a lens comprising an inner surface, an outer surface, and a housing cavity for housing a light emitting unit, wherein a wall surface of the housing cavity is the inner surface,
the lens is in an axisymmetric structure,
the inner surface comprises a first light incident part and a second light incident part, the first light incident part is opposite to the light emitting unit, the second light incident part is connected with the first light incident part and is symmetrical relative to the axis of the lens, the second light incident part comprises a first light incident surface and a second light incident surface, the first light incident surface is connected between the first light incident part and the second light incident surface, the first light incident surface and the second light incident surface are both planes, the highest point of the first light incident surface relative to the light emitting surface of the light emitting unit is a point, the highest point of the second light incident surface relative to the light emitting surface is a point b point, the lowest point of the second light incident surface relative to the light emitting surface is a point c, the absolute value of the slope of the second light incident surface is between 0.36 and 2.75, the relative distance between the point a point and the point b point is greater than the point a in the direction of the axis, the relative distance between the point a and the point a is greater than the point in the direction of the axis and the point a is 2 in the direction of the axis,
the outer surface comprises a reflecting surface and a light emitting surface which are connected, the light emitting surface is opposite to the first light entering part, and the reflecting surface is arranged on the periphery of the second light entering part.
Further, an included angle between the first light incident surface and the axis is within 5 degrees.
Further, the first light incident surface is parallel to the axis.
Further, the second light incident portion further includes a third light incident surface, the second light incident surface is connected between the first light incident surface and the third light incident surface, and an included angle between the first light incident surface and the axis is within 5 °.
Further, the third light incident surface is parallel to the axis.
Further, the first light incident portion is a horizontal plane or is recessed into the accommodating cavity to form an arc surface.
Further, the reflecting surface is a cambered surface.
Further, the lens is a rotary type lens or a stretching type lens.
Furthermore, the lens is made of PMMA or PC.
Further, an incident angle of the light emitted from the center point of the light emitting unit to the second light incident surface is smaller than 20 °.
In order to achieve the above object, the present invention provides a light source module, which includes a light source board, a light emitting unit disposed on the light source board, and the lens, wherein the light emitting unit is accommodated in the accommodating cavity, and the light emitting unit is symmetrical with respect to the axis.
Further, the lens further comprises a bottom surface connecting the inner surface and the outer surface, and the bottom surface is connected to the light source plate.
The beneficial effects are that: according to the lens provided by the invention, the second light incident surface inclined towards the direction far away from the axis is arranged on the inner surface of the lens at the position close to the light emitting unit, and the incidence angle of all incident light rays emitted by the central point of the light emitting unit and incident on the second light incident surface is smaller than 20 degrees based on the arrangement of the position, the height and the slope of the second light incident surface, so that the problem of Fresnel reflection on the second light incident surface is avoided, and the problem of a bright ring on the outer circle of a light spot of the conventional TIR lens is solved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and do not constitute a limitation on the invention. In the drawings:
fig. 1 is a schematic perspective view of a lighting device according to an embodiment of the present invention;
FIG. 2 is an exploded perspective view of the lighting device of FIG. 1;
FIG. 3 is another angular exploded view of the lighting device of FIG. 1;
fig. 4 is a schematic cross-sectional view of a lens according to an embodiment of the invention.
Fig. 5 is a schematic cross-sectional view of another lens according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to specific embodiments of the present invention and corresponding drawings. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1 to 5, the present invention provides a lighting device 100, which includes a housing 30, a light source board 21 accommodated in the housing 30, a light emitting unit 22 disposed on the light source board 21, and an optical element 10 connected to the housing 30, wherein the optical element 10 includes a plurality of lenses 1 having accommodating cavities 14, the light emitting unit 22 is accommodated in the accommodating cavities 14, and light emitted by the light emitting unit 22 is emitted after being distributed by the lenses 1. The lighting device 100 can be applied to a projection lamp and has a good light emitting effect.
The following describes each element and the connection relationship between the elements in the lighting device 100 according to the embodiment of the present invention.
In this embodiment, the light source plate 21 is fixed on a receiving surface (not labeled) in the housing 30, and a plurality of light emitting units 22 are disposed on the light source plate 21, and the plurality of light emitting units 22 are annularly arranged on the light source plate 21. The light emitting unit 22 has a light emitting surface 221. The optical element 10 includes a plurality of lenses 1, the lenses 1 are of a rotary structure, and the lenses 1 are covered one-to-one over the light emitting units 22. In other alternative embodiments, the lens 1 may also be a stretched structure, in which case the light emitting units 22 are sequentially arranged along the extending direction of the lens 1. The light emitting unit 22 may be an LED light source, TL light source, or other light source.
The optical element 10 may be made of PMMA, PC or other materials, and may be connected to the housing 30 by a snap connection or the like. Specifically, the optical element 10 includes a base 2 and a plurality of lenses 1 disposed on one side of the base 2. The lens 1 has an inner surface 11, an outer surface 12, a bottom surface 13 connecting the inner surface 11 and the outer surface 12, and a housing cavity 14, wherein the wall surface of the housing cavity 14 is the inner surface 11, and the bottom surface 13 is connected to the light source plate 21 by means of bonding, positioning by positioning columns, or the like. The lens 1 has an axisymmetric structure, and may be a rotary type lens or a stretching type lens, and when the lens 1 has a rotary type structure, the axis 110 thereof is a rotation axis thereof; when the lens 1 is of a stretched configuration, the axis 110 is the symmetry axis thereof.
The following will specifically explain the structure of the lens 1:
the inner surface 11 includes a first light entrance portion 111 and a second light entrance portion 112, the first light entrance portion 111 being opposite to the light emitting unit 22, the second light entrance portion 112 being connected to the first light entrance portion 111 and being symmetrical with respect to the axis 110. The first light incident portion 111 is a bottom surface of the accommodating cavity 14, the first light incident portion 111 is a plane or is recessed into the accommodating cavity 14 to form an arc surface, and the second light incident portion 112 is a side surface of the accommodating cavity 14. When the lens 1 is a rotary lens, the second light incident portion 112 is a circumferential surface; when the lens 1 is an extended lens, the second light incident portion 112 is two extended surfaces disposed opposite to each other on both sides of the first light incident portion 111.
Specifically, as shown in fig. 4, the second light incident portion 112 includes a first light incident surface 1121 and a second light incident surface 1122 connected in sequence, and the first light incident surface 1121 is connected between the first light incident portion 111 and the second light incident surface 1122, that is, the second light incident surface 1122 is located below the first light incident surface 1121. The first light incident surface 1121 and the second light incident surface 1122 are both planar, that is, the first light incident surface 1121 and the second light incident surface 1122 are both straight lines on the axial cross section of the lens 1. The first light incident surface 1121 is parallel to the axis 110, or may be inclined by less than 5 ° according to actual machining requirements.
Defining the center point of the light emitting surface 221 of the light emitting unit 22 as the origin o, the highest point of the first light incident surface 1121 relative to the light emitting surface 221 of the light emitting unit 22 as the point a, the highest point of the second light incident surface 1122 relative to the light emitting surface 221 as the point b, the lowest point of the second light incident surface 1122 relative to the light emitting surface 221 as the point c, the relative distance between the point a and the point b in the axis 110 direction as h1, the relative distance between the point b and the point c in the axis 110 direction as h2, and the relative distance between the point a and the point c in the axis 110 direction as h. In the present embodiment, h2 is less than 1/2h and h1 is greater than 1/2h, that is, the second light incident surface 1122 is located in the lower half section of the second light incident portion 112. From point b to point c, the second light incident surface 1122 is inclined away from the axis 110, and the absolute value of the slope of the second light incident surface 1122 is between 0.36 and 2.75. Based on the setting of the position and the height of the second light incident surface 1122, in combination with the setting of the slope of the second light incident surface 1122, all incident angles α of the light rays emitted from the origin o onto the second light incident surface 1122 are smaller than 20 °.
The outer surface 12 includes a reflective surface 121 and a light emitting surface 122, the light emitting surface 122 is opposite to the first light incident portion 111, and the reflective surface 121 is disposed at the periphery of the second light incident portion 112. In the present embodiment, the light-emitting surface 122 is a plane, and in other alternative embodiments, the light-emitting surface 122 may be a curved surface. The reflecting surface 121 is a cambered surface and is a total internal reflecting surface.
The light emitted from the light emitting unit 22 enters the lens 1 through the first light incident portion 111 or the second light incident portion 112. Light entering the lens 1 from the first light entrance portion 111 is refracted to the light exit surface 122 and is refracted by the light exit surface 122 and then exits, light entering the lens 1 from the second light entrance portion 112 is reflected to the light exit surface 122 by the reflecting surface 121 and is refracted by the light exit surface 122 and then exits, and on an axial section of the lens 1, the incident angles alpha of all incident light rays incident on the second light entrance surface 1122 from the origin o are smaller than 20 degrees.
When the incident light is incident on the second light incident surface 1122, fresnel phenomenon is easily generated if the incident angle is large. Therefore, the incident angle α of the light beam emitted from the origin o to the second light incident surface 1122 is controlled within 20 °, and the incident light beam does not have a reflection phenomenon due to fresnel reflection characteristics, so that the problem of flare on the surface of the light beam emitted from the lens 1 is avoided.
Referring to fig. 5, in an embodiment, the second light incident portion 112 of the lens 1 includes a first light incident surface 1121, a second light incident surface 1122, and a third light incident surface 1123 sequentially connected, the first light incident surface 1121 is connected between the first light incident portion 111 and the second light incident surface 1122, that is, the second light incident surface 1122 is located below the first light incident surface 1121, and the third light incident surface 1123 is located below the second light incident surface 1122. The first light incident surface 1121, the second light incident surface 1122, and the third light incident surface 1123 are all planar surfaces. The first light incident surface 1121 and the third light incident surface 1123 are parallel to the axis 110, or may be inclined within 5 ° according to actual processing requirements. In the present embodiment, h2 is less than 1/2h and h1 is greater than 1/2h, that is, the second light incident surface 1122 is located in the lower half section of the second light incident portion 112. From point b to point c, the second light incident surface 1122 is inclined away from the axis 110, and the conditions required for the inclination of the second light incident surface 1122 are: the absolute value of the slope of the second light incident surface 1122 is between 0.36 and 2.75, and the incident angle α of all incident light rays incident on the second light incident surface 1122 from the origin o is smaller than 20 °.
Since the incident angle α of the light beam emitted from the origin o to the second light incident surface 1122 is controlled to be within 20 °, the incident light beam to the second light incident surface 1122 does not have a reflection phenomenon due to fresnel reflection characteristics. The third light incident surface 1123 is adjacent to the light source plate 21 and is disposed parallel to the plane of the axis 110, so as to avoid that the bottom thickness of the lens 1 is too thin to affect the overall structural strength of the lens 1 when the bottom surface 130 of the lens 1 is connected to the light source plate 21.
According to the lens provided by the embodiment of the invention, the incidence angle of all incident light rays which are emitted by the central point of the light emitting unit and are incident on the second light incident surface is smaller than 20 DEG based on the arrangement of the position, the height and the slope of the second light incident surface on the inner surface of the lens close to the light emitting unit, so that the problem of Fresnel reflection on the second light incident surface is avoided, and the problem of a bright ring on the outer circle of a light spot of the conventional TIR lens is solved.
While the foregoing is directed to embodiments of the present invention, other and further details of the invention may be had by the present invention, it should be understood that the foregoing description is merely illustrative of the present invention and that no limitations are intended to the scope of the invention, except insofar as modifications, equivalents, improvements or modifications may be made within the spirit and principles of the invention.
Claims (10)
1. A lens comprises an inner surface, an outer surface and a containing cavity for containing a light-emitting unit, wherein the wall surface of the containing cavity is the inner surface,
the lens is in an axisymmetric structure,
the inner surface comprises a first light incident part and a second light incident part, the first light incident part is opposite to the light emitting unit, the second light incident part is connected with the first light incident part and is symmetrical relative to the axis of the lens, the second light incident part comprises a first light incident surface and a second light incident surface, the first light incident surface is connected between the first light incident part and the second light incident surface, the first light incident surface and the second light incident surface are both planes, the included angle between the first light incident surface and the axis is within 5 degrees, the highest point of the first light incident surface relative to the light emitting surface of the light emitting unit is a point, the highest point of the second light incident surface relative to the light emitting surface is a point b, the lowest point of the second light incident surface relative to the light emitting surface is a point c, from the point a to the point c, the second light incident surface is inclined in a direction far away from the axis, the absolute value of the slope of the second light incident surface is between 0.36 and 2.75, the incident angle of the light emitted by the central point of the light emitting unit is smaller than 20 degrees, the relative distance between the point a and the point b in the axis direction is larger than 1/2 of the relative distance between the point a and the point c in the axis direction,
the outer surface comprises a reflecting surface and a light emitting surface which are connected, the light emitting surface is opposite to the first light entering part, and the reflecting surface is arranged on the periphery of the second light entering part.
2. The lens of claim 1, wherein the first light entrance surface is parallel to the axis.
3. The lens of claim 1, wherein the second light entrance portion further comprises a third light entrance surface, the second light entrance surface is connected between the first light entrance surface and the third light entrance surface, and an included angle between the third light entrance surface and the axis is within 5 °.
4. A lens according to claim 3, wherein the third light entrance face is parallel to the axis.
5. The lens of claim 1, wherein the first light entrance portion is a horizontal plane or recessed into the interior of the receiving cavity to form a curved surface.
6. The lens of claim 1 wherein the reflective surface is a curved surface.
7. The lens of claim 1, wherein the lens is a rotary type lens or a stretch type lens.
8. The lens of claim 1, wherein the lens is made of PMMA or PC.
9. A light source module, comprising a light source board, a light emitting unit disposed on the light source board, and the lens of any one of claims 1-8, wherein the light emitting unit is accommodated in the accommodating cavity, and the light emitting unit is symmetrical with respect to the axis.
10. The light source module of claim 9, wherein the lens further comprises a bottom surface connecting the inner surface and the outer surface, the bottom surface being connected to the light source board.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810630267.7A CN108775553B (en) | 2018-06-19 | 2018-06-19 | Lens and light source module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810630267.7A CN108775553B (en) | 2018-06-19 | 2018-06-19 | Lens and light source module |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108775553A CN108775553A (en) | 2018-11-09 |
| CN108775553B true CN108775553B (en) | 2023-07-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810630267.7A Active CN108775553B (en) | 2018-06-19 | 2018-06-19 | Lens and light source module |
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| CN (1) | CN108775553B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113251383B (en) * | 2021-06-04 | 2022-06-21 | 浙江光锥科技有限公司 | TIR collimating lens |
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| CN1404630A (en) * | 2000-12-22 | 2003-03-19 | 皇家菲利浦电子有限公司 | LED module |
| JP2009009926A (en) * | 2007-03-23 | 2009-01-15 | Toshiba Lighting & Technology Corp | Light emitting diode lighting system |
| CN105465627A (en) * | 2015-12-30 | 2016-04-06 | 欧普照明股份有限公司 | Light beam control device and light-emitting device |
| CN105929469A (en) * | 2016-06-30 | 2016-09-07 | 成都恒坤光电科技有限公司 | Lens, lighting device and high-beam illumination optical system for motor vehicle |
| CN207018852U (en) * | 2017-07-25 | 2018-02-16 | 深圳市兆码电子有限公司 | A kind of LED reflection lens |
| CN207080826U (en) * | 2017-03-30 | 2018-03-09 | 佛山指南针光学科技有限公司 | A kind of compound total reflection LED spotlight lens |
| CN208204891U (en) * | 2018-06-19 | 2018-12-07 | 苏州欧普照明有限公司 | A kind of lens and light source module group |
-
2018
- 2018-06-19 CN CN201810630267.7A patent/CN108775553B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1404630A (en) * | 2000-12-22 | 2003-03-19 | 皇家菲利浦电子有限公司 | LED module |
| JP2009009926A (en) * | 2007-03-23 | 2009-01-15 | Toshiba Lighting & Technology Corp | Light emitting diode lighting system |
| CN105465627A (en) * | 2015-12-30 | 2016-04-06 | 欧普照明股份有限公司 | Light beam control device and light-emitting device |
| CN105929469A (en) * | 2016-06-30 | 2016-09-07 | 成都恒坤光电科技有限公司 | Lens, lighting device and high-beam illumination optical system for motor vehicle |
| CN207080826U (en) * | 2017-03-30 | 2018-03-09 | 佛山指南针光学科技有限公司 | A kind of compound total reflection LED spotlight lens |
| CN207018852U (en) * | 2017-07-25 | 2018-02-16 | 深圳市兆码电子有限公司 | A kind of LED reflection lens |
| CN208204891U (en) * | 2018-06-19 | 2018-12-07 | 苏州欧普照明有限公司 | A kind of lens and light source module group |
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| Publication number | Publication date |
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| CN108775553A (en) | 2018-11-09 |
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