CN109931573A - A kind of LED lens and lighting device - Google Patents
A kind of LED lens and lighting device Download PDFInfo
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- CN109931573A CN109931573A CN201910311513.7A CN201910311513A CN109931573A CN 109931573 A CN109931573 A CN 109931573A CN 201910311513 A CN201910311513 A CN 201910311513A CN 109931573 A CN109931573 A CN 109931573A
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Abstract
The present invention provides a kind of LED lens and lighting devices, are related to LED technology field.The LED lens include accommodating cavity, fully reflecting surface and light-emitting surface, accommodating cavity is set to one end of fully reflecting surface, light-emitting surface is set to the other end of fully reflecting surface, light-emitting surface is set as the arc convex being recessed along fully reflecting surface, accommodating cavity is for installing a LED light source, and accommodating cavity is provided with close to one end of fully reflecting surface along the first refractive portion far from light-emitting surface direction protrusion, a part propagates to light-emitting surface after the refraction in first refractive portion in the light that LED light source issues, another part propagates to light-emitting surface after the reflection of fully reflecting surface in the light that LED light source issues, and it is propagated out after the refraction of light-emitting surface.LED lens provided by the invention and lighting device have so that the light emitting angle of entire lighting device is smaller, the more preferable advantage of illumination effect.
Description
Technical field
The present invention relates to LED technology fields, in particular to a kind of LED lens and lighting device.
Background technique
In modern times illumination application, as incandescent lamp eliminates the implementation of plan, LED illumination is gradually gained popularity, with biography
System illumination is compared, and LED illumination has significant energy-saving and environmental protection and long-life advantage, and use is more long, year-on-year incandescent lamp or energy-saving lamp
It is more energy saving, therefore LED illumination is widely used to the illuminations such as market, hotel, hospital, road, construction landscape, light of stage neck
Domain.
Stage entertains light, outdoor scene illumination class lamps and lanterns since required power is larger, to realize that this great power LED shines
It is bright, it is primarily present at present and single high-power LED chip is packaged or uses two kinds of technologies of multi-chip integration packaging, for preceding
Person, powerful realization is often limited by chip size, and integration packaging then has greater flexibility, therefore adopts more
With high-power more color LED integrated packaging power sources.LED integration packaging is also referred to as polycrystalline encapsulation, will not according to the size of required power
LED chip assembled package with number is in substrate pedestal, and chip can be designed as serial or parallel connection by this packaged type, with flexible
Ground is applicable in different voltage and currents, while its cost performance with higher, be increasingly becoming LED encapsulation main flow direction it
One.
Since there are multiple chips in integrated encapsulation structure, each chip light-emitting angle is different, needs in primary optical design
On the basis of carry out secondary optical design to meet the needs of users, the purpose of primary optical design is extraction as much as possible
The light that LED chip issues, the purpose of secondary optical design are then that the light for issuing entire lamp system meets design requirement.?
In secondary optical design, LED lens are a kind of important tools, and what use was more on the market is traditional male model lens, though
Light out can so be improved to a certain degree, but there is a problem of that the light emitting angle of lighting device is larger.
Summary of the invention
The purpose of the present invention is to provide a kind of LED lens, with solve the light emitting angle of lighting device in the prior art compared with
Big problem.
Another object of the present invention is to provide a kind of lighting devices, to solve the light emitting anger of lighting device in the prior art
Spend larger problem.
The present invention is implemented as follows:
On the one hand, the embodiment of the invention provides a kind of LED lens, the LED lens include accommodating cavity, fully reflecting surface with
And light-emitting surface, the accommodating cavity are set to one end of the fully reflecting surface, the light-emitting surface is set to the another of the fully reflecting surface
One end, the light-emitting surface are set as the arc convex being recessed along the fully reflecting surface, and the accommodating cavity is for installing a LED light
Source, and the accommodating cavity is provided with close to one end of the fully reflecting surface along the first refractive far from the light-emitting surface direction protrusion
Portion, a part propagates to the light-emitting surface, institute after the refraction in the first refractive portion in the light that the LED light source issues
It states another part in the light of LED light source sending and propagates to light-emitting surface after the reflection of the fully reflecting surface, and through the light out
It is propagated out after the refraction in face.
Further, the light-emitting surface includes arc convex and central concave area, wherein the arc convex and it is described in
Heart depressed area connects, and a part propagates to institute after the refraction in the first refractive portion in the light that the LED light source issues
Central concave area is stated, and is propagated out after the refraction of the central concave area；Another part in the light that the LED light source issues
The arc convex is propagated to after the reflection of the fully reflecting surface, and is propagated out after the refraction of the arc convex.
Further, the central concave area includes raising upward and the side wall for connecting with arc convex, wherein institute
Stating arc convex is the second refraction part, a part in the light issued for third reflect portion, the LED light source that raises upward
The third reflect portion is propagated to after the refraction in the first refractive portion, and is propagated after the refraction in the third reflect portion
Out；Another part propagates to second refraction part after the reflection of the fully reflecting surface in the light that the LED light source issues,
And it is propagated out after the refraction of second refraction part.
Further, the arc convex is made of the arrangement of diamond shape free form surface array of protrusions.
Further, the diamond shape free form surface array of protrusions includes multiple diamond shape free form surface protrusions, and the diamond shape is certainly
It is gradually reduced from the size of curved protrusion and radius of curvature along the surrounding of the arc convex toward middle position.
Further, the size of the diamond shape free form surface protrusion is 1.13-2.46mm；The diamond shape free form surface protrusion
Radius of curvature be 37-67mm.
Further, the accommodating cavity further includes side wall, and the side wall is connect with the first refractive portion, and the side wall is
Fourth reflect portion, another part propagates to described after the refraction in the fourth reflect portion in the light that the LED light source issues
Fully reflecting surface propagates to light-emitting surface, and propagates out after the refraction of the light-emitting surface after the reflection by the fully reflecting surface.
Further, the fully reflecting surface is formed by free curve around center axis rotation.
Further, the diameter of the LED lens is sequentially increased along the direction of the fully reflecting surface to the light-emitting surface.
On the other hand, the embodiment of the invention also provides a kind of lighting device, the lighting device include LED light source with
LED lens, the LED light source are installed in the accommodating cavity.
Compared with the prior art, the invention has the following advantages:
The present invention provides a kind of LED lens and lighting device, which includes accommodating cavity, fully reflecting surface and goes out
Smooth surface, accommodating cavity are set to one end of fully reflecting surface, and light-emitting surface is set to the other end of fully reflecting surface, and light-emitting surface is set as along complete
The arc convex of reflecting surface recess, accommodating cavity is for installing a LED light source, and accommodating cavity is provided with close to one end of fully reflecting surface
A part passes through the folding in first refractive portion along the light that the first refractive portion far from light-emitting surface direction protrusion, LED light source issue
Light-emitting surface is propagated to after penetrating, another part propagates to light-emitting surface after the reflection of fully reflecting surface in the light that LED light source issues, and
It is propagated out after the refraction of light-emitting surface.Since LED lens provided by the invention include accommodating cavity, and the accommodating cavity is provided with first
Refraction part, therefore the front light that LED light source issues can then propagate to fully reflecting surface by the refraction in first refractive portion,
And then LED light source can be reduced along the light emitting angle of positive direction；Meanwhile the side light that LED light source issues is by full hair
It, can be by the refraction of light-emitting surface, so that the direction of propagation of light is along positive direction, so that entire shine after penetrating the reflection in face
The light emitting angle of bright device is smaller, and illumination effect is more preferable.
To enable the above objects, features and advantages of the present invention to be clearer and more comprehensible, preferred embodiment is cited below particularly, and cooperate
Appended attached drawing, is described in detail below.
Detailed description of the invention
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.The present invention being usually described and illustrated herein in the accompanying drawings is implemented
The component of example can be arranged and be designed with a variety of different configurations.Therefore, below to the reality of the invention provided in the accompanying drawings
The detailed description for applying example is not intended to limit the range of claimed invention, but is merely representative of selected implementation of the invention
Example.Based on the embodiments of the present invention, obtained by those of ordinary skill in the art without making creative efforts
Every other embodiment, shall fall within the protection scope of the present invention.
Fig. 1 shows the sectional view of LED lens provided by the embodiment of the present invention.
Fig. 2 shows the structure charts for the LED lens that the first visual angle is in provided by the embodiment of the present invention.
Fig. 3 shows the structure chart of the LED lens provided by the embodiment of the present invention in the second visual angle.
The light that Fig. 4 shows lighting device provided by the embodiment of the present invention propagates schematic diagram.
Icon: 100-LED lens；110- accommodating cavity；111- first refractive portion；112- fourth reflect portion；120- total reflection
Face；130- light-emitting surface；The central concave area 131-；1311- raises upward；1312- side wall；132- arc convex；200- illumination dress
It sets；210-LED light source.
Specific embodiment
Below in conjunction with attached drawing in the embodiment of the present invention, technical solution in the embodiment of the present invention carries out clear, complete
Ground description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Usually exist
The component of the embodiment of the present invention described and illustrated in attached drawing can be arranged and be designed with a variety of different configurations herein.Cause
This, is not intended to limit claimed invention to the detailed description of the embodiment of the present invention provided in the accompanying drawings below
Range, but it is merely representative of selected embodiment of the invention.Based on the embodiment of the present invention, those skilled in the art are not doing
Every other embodiment obtained under the premise of creative work out, shall fall within the protection scope of the present invention.
In the description of the present invention, it is also necessary to which explanation is unless specifically defined or limited otherwise, term " setting ",
" installation ", " connected ", " connection " shall be understood in a broad sense, for example, it may be fixedly connected, may be a detachable connection or one
Connect to body；It can be mechanical connection, be also possible to be electrically connected；It can be directly connected, it can also be indirect by intermediary
It is connected, can be the connection inside two elements.For the ordinary skill in the art, on being understood with concrete condition
State the concrete meaning of term in the present invention.
It should also be noted that similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi
It is defined in a attached drawing, does not then need that it is further defined and explained in subsequent attached drawing.
With reference to the accompanying drawing, it elaborates to some embodiments of the present invention.In the absence of conflict, following
Feature in embodiment and embodiment can be combined with each other.
First embodiment
Referring to Fig. 1, the embodiment of the invention provides a kind of LED lens 100, the LED lens 100 include accommodating cavity 110,
130 second refraction part of fully reflecting surface 120 and light-emitting surface, wherein accommodating cavity 110 is set to one end of fully reflecting surface 120, out light
Face 130 is set to the other end of fully reflecting surface 120, and accommodating cavity 110, fully reflecting surface 120 and light-emitting surface 130 are sequentially connected
Two refraction part fully reflecting surfaces 120.
Specifically, in the present embodiment, accommodating cavity 110 is used to install a LED light source 210, meanwhile, accommodating cavity 110 is close
One end of fully reflecting surface 120 is provided with along the first refractive portion 111 far from 130 direction of light-emitting surface protrusion, the first refractive portion 111
For refracted light.Since first refractive portion 111 is set as the form of convex lens, when the light that LED light source 210 issues is saturating
When crossing first refractive portion 111, according to refraction principle, it is capable of forming a collimated light beam and projects, so that by the lens
The light emitting angle of light source is smaller.Meanwhile for LED light source 210, the light issued propagates out in a manner of scattering, by
In first refractive portion 111 only is arranged in one end of the close fully reflecting surface 120 of accommodating cavity 110, i.e., set at the top of accommodating cavity 110
First refractive portion 111, therefore the light by 110 side of accommodating cavity that LED light source 210 issues are set, accommodating cavity 110 can be passed through
Fully reflecting surface 120 is propagated to after refraction, and propagates to light-emitting surface 130 by the reflection of fully reflecting surface 120, and through light-emitting surface 130
Refraction after propagate out.
In the present embodiment, accommodating cavity 110 further includes side wall 1312, and side wall 1312 is connect with first refractive portion 111,
In, side wall 1312 is fourth reflect portion 112, and in the light that LED light source 210 issues in accommodating cavity 110, a part is through the first folding
The refraction of portion 111 is penetrated, and the light after first refractive portion 111 reflects propagates to light-emitting surface 130；Another part is through fourth reflect portion
Fully reflecting surface 120 is propagated to after 112 refraction, light-emitting surface 130 is propagated to after the reflection by fully reflecting surface 120, and through going out light
It is propagated out after the refraction in face 130.
Wherein, the light emitting angle of light source described in the present embodiment refers to that beam angle, beam angle refer to the maximum light of lamps and lanterns 1/10
Angle between strong, for describing Projecting Lamp classification.Beam angle reaction is exactly spot size and light intensity on by screen wall facing the gate of a house face, equally
If light source apply in the reflector of different angle, beam angle is bigger, and central light strength is smaller, and hot spot is bigger；It applies indirect
Lighting theory is same, and beam angle is smaller, and environmental light intensity is bigger, and dispersion effect is poorer.Specifically, light-emitting surface 130 includes
Arc convex 132 and central concave area 131, wherein arc convex 132 is connect with central concave area 131, and LED light source 210 issues
Light in a part central concave area 131 is propagated to after the refraction in first refractive portion 111, and through central concave area 131
Refraction after propagate out；Another part propagates to arc after the reflection of fully reflecting surface 120 in the light that LED light source 210 issues
Convex surface 132, and propagated out after the refraction of arc convex 132.
Wherein, central concave area 131 includes raise upward 1311 and the side wall 1312 for connecting with arc convex 132,
Wherein, arc convex 132 is the second refraction part, raises upward 1311 for third reflect portion, in the light that LED light source 210 issues
A part propagates to third reflect portion after the refraction in first refractive portion 111, and propagates out after the refraction in third reflect portion；
Another part propagates to the second refraction part after the reflection of fully reflecting surface 120 in the light that LED light source 210 issues, and through second
It is propagated out after the refraction of refraction part.
Refraction by first refractive portion 111, the second refraction part, third reflect portion and fourth reflect portion 112 to light,
It can be realized smaller by the light emitting angle of the light source of the lens.
It should be noted that wherein, the diameters of LED lens 100 along fully reflecting surface 120 to light-emitting surface 130 direction according to
Secondary increase, i.e., the direction of entire fully reflecting surface 120 from bottom to top become larger, when the light that LED light source 210 issues is through accommodating
After chamber 110, fully reflecting surface 120 can reflect light, and the direction of propagation of the light after reflection is drawn close to vertical direction, and
And light after reflection continues to propagate to light-emitting surface 130.
Also, in the present embodiment, fully reflecting surface 120 is formed by free curve around center axis rotation, so that fully reflecting surface 120
For symmetrical structure, be conducive to keep the light by the LED lens 100 softer from the uniform reflection light of all directions.
Please refer to Fig. 2 and Fig. 3, wherein light-emitting surface 130 is for being reflected and being propagated out to light, as light-emitting surface, out
Smooth surface 130 is set to the other end of fully reflecting surface 120, and the arc convex 132 of light-emitting surface 130 and central concave area 131 make entirely
The light emitting angle for the light that LED light source 210 issues further decreases.
Furthermore, it is desirable to explanation, the light after first refractive portion 111 reflects can generally propagate to light-emitting surface 130
Middle position, and the edge placement of light-emitting surface 130 can generally be propagated to by passing through the light that fully reflecting surface 120 reflects, due to going out
Smooth surface 130 is provided with central concave area 131, and for the angle for going out light further decreased, central concave area 131 raises upward
The one side that 1311 direction goes out light is plane, and the direction of central concave area 131 is a protrusion close to the one side of accommodating cavity 110,
To form third reflect portion, therefore when light is propagated to through third reflect portion, third reflect portion can will pass through the first folding
The light after portion 111 reflects is penetrated, is propagated out after being reflected again, and then the light emitting anger of LED light source 210 can be further decreased
The low-angle light beam lower than 3.5 ° can be achieved under conventional lenses outer dimension and project, can be widely applied to the throwing of the open air LED for degree
Light lamp, amusement pa lamp, wall lamp, matrix lamp etc..
Meanwhile in order to which the light for issuing light source is softer, light mixing effect is more preferable, in the present embodiment, arc convex
132 are made of the arrangement of diamond shape free form surface array of protrusions.By multiple diamond shape free form surfaces protrusion of combination, so that saturating in LED
Plaited surface light-emitting surface 130 is formed in mirror 100, there is more preferably color blending effect than conventional lenses, while also there is beautiful external form, it is simultaneous
Have excellent optical effect and aesthetic characteristic.
Also, diamond shape free form surface array of protrusions includes multiple diamond shape free form surface protrusions, diamond shape free form surface protrusion
The surrounding on size and radius of curvature arcuately convex surface 132 is gradually reduced toward middle position, to meet the practical ruler of fully reflecting surface 120
It is very little.
Further, in the present embodiment, the size of diamond shape free form surface protrusion is 1.13-2.46mm.Diamond shape is freely bent
The radius of curvature of face protrusion is 37-67mm.Of course, in some other embodiments, the size of diamond shape free form surface protrusion
With curvature or other values, the present embodiment does not do any restriction to this.
Meanwhile the bottom of fully reflecting surface 120 is frosting, by the way that frosting is arranged, entire LED light source 210 can be made to send out
Light out is softer.
Further, it should be noted that the basal diameter of accommodating cavity 110 is greater than or equal to 10mm, and LED light source 210
It is greater than or equal to 7mm with the spacing in first refractive portion 111, so that the LED lens 100 can be adapted to any power between 5-50W
Multi-color LED light source 210.
Second embodiment
Referring to Fig. 4, the lighting device 200 includes LED light the embodiment of the invention also provides a kind of lighting device 200
LED lens 100 described in source 210 and first embodiment, the LED light source 210 are installed in accommodating cavity 110.LED light source 210 issues
Light by the way that light-emitting surface, light can be propagated to by the reflection of the fully reflecting surface 120 of lens body side after LED lens 100
Line becomes ultra-narrow light beam after the even smooth colour mixture processing using free form surface optically focused and arc convex 132 and projects away, in routine
The ultra-low-angle light beam lower than 3 ° can be achieved under lens-shape size to project, there is good even smooth color blending effect, can answer extensively
For LED outdoor project lamp, amusement pa lamp, wall lamp, matrix lamp etc..
In conclusion the LED lens include accommodating cavity, total reflection the present invention provides a kind of LED lens and lighting device
Face and light-emitting surface, accommodating cavity are set to one end of fully reflecting surface, and light-emitting surface is set to the other end of fully reflecting surface, and light-emitting surface is set
It is set to the arc convex along fully reflecting surface recess, accommodating cavity is for installing a LED light source, and accommodating cavity is close to the one of fully reflecting surface
End is provided with a part along the light that the first refractive portion far from light-emitting surface direction protrusion, LED light source issue and passes through the first folding
Light-emitting surface is propagated to after penetrating the refraction in portion, another part propagates to after the reflection of fully reflecting surface in the light that LED light source issues
Light-emitting surface, and propagated out after the refraction of light-emitting surface.Since LED lens provided by the invention include accommodating cavity, and the accommodating cavity
It is provided with first refractive portion, therefore the front light that LED light source issues can be then propagated to by the refraction in first refractive portion
Fully reflecting surface, and then LED light source can be reduced along the light emitting angle of positive direction；Meanwhile the side light that LED light source issues exists
It, can be by the refraction of light-emitting surface, so that the direction of propagation of light is along positive direction, to make after the reflection in full transmitting face
The light emitting angle for obtaining entire lighting device is smaller, and illumination effect is more preferable.
In the description of the present invention, it should be noted that term " first ", " second " etc. are only used for distinguishing description, without
It can be interpreted as indication or suggestion relative importance.The foregoing is only a preferred embodiment of the present invention, is not limited to
The present invention, for those skilled in the art, the invention may be variously modified and varied.It is all in spirit of the invention and
Within principle, any modification, equivalent substitution, improvement and etc. done be should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of LED lens, which is characterized in that the LED lens include accommodating cavity, fully reflecting surface and light-emitting surface, the appearance
One end that chamber is set to the fully reflecting surface is set, the light-emitting surface is set to the other end of the fully reflecting surface, the light-emitting surface
It is set as the arc convex being recessed along the fully reflecting surface, the accommodating cavity is for installing a LED light source, and the accommodating cavity leans on
One end of the nearly fully reflecting surface is provided with along the first refractive portion far from the light-emitting surface direction protrusion, the LED light source hair
A part propagates to the light-emitting surface after the refraction in the first refractive portion in light out, what the LED light source issued
Another part propagates to light-emitting surface after the reflection of the fully reflecting surface in light, and propagates after the refraction of the light-emitting surface
Out.
2. LED lens as described in claim 1, which is characterized in that the light-emitting surface includes arc convex and central concave area,
Wherein, the arc convex is connect with the central concave area, and a part is by described the in the light that the LED light source issues
The central concave area is propagated to after the refraction of one refraction part, and is propagated out after the refraction of the central concave area；The LED
Another part propagates to the arc convex after the reflection of the fully reflecting surface in the light that light source issues, and through the arc
It is propagated out after the refraction on convex surface.
3. LED lens as claimed in claim 2, which is characterized in that the central concave area include raise upward and for
The side wall of arc convex connection, wherein the arc convex is the second refraction part, described to raise upward as third reflect portion, institute
It states a part in the light of LED light source sending and propagates to the third reflect portion after the refraction in the first refractive portion, and
It is propagated out after the refraction in the third reflect portion；Another part is through the fully reflecting surface in the light that the LED light source issues
Reflection after propagate to second refraction part, and propagated out after the refraction of second refraction part.
4. LED lens as described in claim 1, which is characterized in that the arc convex is by diamond shape free form surface array of protrusions
Arrangement composition.
5. LED lens as claimed in claim 4, which is characterized in that the diamond shape free form surface array of protrusions includes multiple water chestnuts
Shape free form surface protrusion, the size and radius of curvature of the diamond shape free form surface protrusion along the arc convex surrounding toward intermediate
Position is gradually reduced.
6. LED lens as claimed in claim 5, which is characterized in that the size of the diamond shape free form surface protrusion is 1.13-
2.46mm；The radius of curvature of the diamond shape free form surface protrusion is 37-67mm.
7. LED lens as described in claim 1, which is characterized in that the accommodating cavity further includes side wall, the side wall with it is described
The connection of first refractive portion, the side wall are fourth reflect portion, and another part is through the described 4th in the light that the LED light source issues
The fully reflecting surface is propagated to after the refraction of refraction part, light-emitting surface is propagated to after the reflection by the fully reflecting surface, and through institute
It is propagated out after stating the refraction of light-emitting surface.
8. LED lens as described in claim 1, which is characterized in that the fully reflecting surface is by free curve around center axis rotation
It forms.
9. LED lens as described in claim 1, which is characterized in that the diameter of the LED lens is along the fully reflecting surface to institute
The direction for the light-emitting surface stated is sequentially increased.
10. a kind of lighting device, which is characterized in that the lighting device includes that LED light source and such as claim 1 to 9 are any one
LED lens described in, the LED light source are installed in the accommodating cavity.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910311513.7A CN109931573A (en) | 2019-04-18 | 2019-04-18 | A kind of LED lens and lighting device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910311513.7A CN109931573A (en) | 2019-04-18 | 2019-04-18 | A kind of LED lens and lighting device |
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| CN109931573A true CN109931573A (en) | 2019-06-25 |
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| CN110469824A (en) * | 2019-08-26 | 2019-11-19 | 深圳市百康光电有限公司 | A kind of collector lens and lamps and lanterns |
| CN112505807A (en) * | 2020-12-01 | 2021-03-16 | 华中光电技术研究所（中国船舶重工集团公司第七一七研究所） | Terahertz wave collimation focusing lens and terahertz wave system |
| CN112505807B (en) * | 2020-12-01 | 2023-03-10 | 华中光电技术研究所（中国船舶重工集团公司第七一七研究所） | Terahertz wave collimation focusing lens and terahertz wave system |
| CN113551201A (en) * | 2021-07-29 | 2021-10-26 | 南华机电(太仓)有限公司 | Light ray control method of lens, aviation obstruction light based on lens and electronic equipment |
| CN113900343A (en) * | 2021-10-19 | 2022-01-07 | 马瑞利汽车零部件(芜湖)有限公司 | Large-angle vehicle body projection optical system |
| CN113900343B (en) * | 2021-10-19 | 2023-10-27 | 马瑞利汽车零部件(芜湖)有限公司 | Large-angle car body projection optical system |
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