CN106838765B - A kind of welcome's lamp optical system and its design method generating the ring of light - Google Patents
A kind of welcome's lamp optical system and its design method generating the ring of light Download PDFInfo
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- CN106838765B CN106838765B CN201710056103.3A CN201710056103A CN106838765B CN 106838765 B CN106838765 B CN 106838765B CN 201710056103 A CN201710056103 A CN 201710056103A CN 106838765 B CN106838765 B CN 106838765B
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
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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
- F21V14/00—Controlling the distribution of the light emitted by adjustment of elements
- F21V14/02—Controlling the distribution of the light emitted by adjustment of elements by movement of light sources
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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
- F21V14/00—Controlling the distribution of the light emitted by adjustment of elements
- F21V14/08—Controlling the distribution of the light emitted by adjustment of elements by movement of the screens or filters
-
- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
- F21W2107/00—Use or application of lighting devices on or in particular types of vehicles
- F21W2107/10—Use or application of lighting devices on or in particular types of vehicles for land vehicles
Abstract
The present invention proposes a kind of welcome's lamp optical system and its design method for generating the ring of light, and welcome's lamp optical system includes shadow surface and optical array, and the optical array is made of several optical modules；The optical module includes light source and circular refractor, and refractor is parallel with shadow surface, and the light source is located at refractor light-receiving surface side, and the refractor light-receiving surface of each optical module is in the same plane；The light source emergent light is directional light；The light-emitting surface of the refractor is equipped with the concentric ring gear of i section indention shape, and the ring gear center of circle is overlapped with the center of circle of refractor, and the facewidth of the zigzag fashion is identical, and the bottom of the tooth of zigzag fashion is generally aligned in the same plane；The present invention can be come with class Fresnel reflections optical element on shadow surface generate ring of light pattern, and can by with the composite structure of specific illumination light source and class fresnel lens array come on shadow surface generate four ring patterns shaped like Audi's trade mark.
Description
Technical field
The present invention relates to light to beautify technical field, especially a kind of welcome's lamp optical system and its design for generating the ring of light
Method.
Background technique
Optical design is widely used in projection lamp, vehicle door lamp and greeting lamp.With the continuous development of automotive engineering, people
Hommization and stylishness to automobile have higher requirement.Vehicle door lamp or greeting lamp are a fashionable elements in automobile
One of, when automobile unlock or when car door opening, will generate on the ground below rearview mirror or below car door pattern or
It is text, can not only plays the role of illumination, but also also adds the stylishness of automobile.
Current optical system generates pattern on shadow surface, generallys use projection, such as a kind of (application of projection lamp of patent
Number: 201410482547.X).This patent is that hot spot is imaged in a specified plane using projection theory, this scheme is
The most commonly used method of various hot spots is obtained at present.This system mainly includes light source, lens and printing layer.The light that light source issues
Projected through lens, then by after printing layer by pattern projection to receiving plane.A kind of automobile door projecting lamp and its apply (application number
201110318149.0).This patent is to utilize equally to be using the method for projection, and light source, which is irradiated to, to be printed on the figuratum film,
Then by projection lens set on pattern projection to receiving plane.A kind of automobile laser greeting lamp (application number:
201510811326.7).This patent also with projection method, unlike pattern be arranged on diffraction element.More than
The mode of three kinds of generation hot spots is all using the principle of projection, the pattern on printing layer (or the film or diffraction element)
It projects on receiving plane.First two pattern is that pattern is arranged in printing layer and the film, and light passes through printing layer or the film
When can generate biggish light energy losses；The third scheme pattern is arranged on slightly diffraction element, although light passes through diffraction
Two schemes have biggish promotion to energy after element earlier above, but the amplification for still needing that optical projection system is relied on to realize pattern,
So that system dimension is larger.
There are also the way for forming hot spot by free-form surface lens, principle is that the light that light source issues can through free form surface
Diameter realizes hot spot of different shapes, but Free-Form Surface Machining is complicated, and involves great expense.
Fresnel reflections optical element is optical device common at present, and design is simple, size is light and handy, is easily installed,
As can Fresnel reflections optical element is used for the optical system of greeting lamp, it is beneficial to designing and manufacturing for such lamps and lanterns.
Summary of the invention
The present invention proposes a kind of welcome's lamp optical system and its design method for generating the ring of light, can be with class Fresnel reflections light
Element is learned to generate ring of light pattern on shadow surface, and can be by with the combination of specific illumination light source and class fresnel lens array
Structure to generate four ring patterns shaped like Audi's trade mark on shadow surface.
The present invention uses following technical scheme.
A kind of welcome's lamp optical system and its design method generating the ring of light, can be rolled over the optical focus of class Fresnel Lenses
It penetrates and generates ring-shaped light spot on shadow surface, welcome's lamp optical system includes shadow surface and optical array, the optical array
It is made of several optical modules；The optical module includes light source and circular refractor, and refractor is parallel with shadow surface,
The light source is located at refractor light-receiving surface side, and the refractor light-receiving surface of each optical module is in the same plane；It is described
Light source emergent light is directional light.
The light-emitting surface of the refractor is equipped with the concentric ring gear of i section indention shape, the ring gear center of circle and refraction
The centers of circle of lens is overlapped, and the tooth form inclination angle of the zigzag fashion is α, a height of h of tooth, and the facewidth of each tooth form is identical and is p, and i-th
The radial distance of the tooth form inclined-plane midpoint of ring to central axis is ri, the bottom of the tooth of zigzag fashion is generally aligned in the same plane.
When light source emergent light is perpendicular to refractor light-receiving surface, the Refractive Index of Material of refractor is n, lens light-receiving surface with
The distance between shadow surface be WD, it is desirable that lens on light source emergent light be focused refraction be allowed on shadow surface formed radius be
When the round ring-shaped light spot of R,
The r of the tooth form of the zigzag fashion of i-th ring geariAccounting equation is；
Formula 1
In the zigzag fashion of i-th ring gear, sawtooth is on one side perpendicular to lens light-receiving surface；Sawtooth another side is and lens light-receiving surface
The angle of the chamfered edge of angled setting, chamfered edge and lens light-receiving surface is tooth form inclination angle, the tooth form inclination alpha of i-th ring geari
Accounting equation is；
Formula 2
The high h of the tooth of i-th ring geariAccounting equation is；
3 h of formulai=p × tan (αi)。
When require optical array generate four ring-shaped light spots, and ring-shaped light spot arrange on the same line simultaneously superposition forming such as
When four ring patterns of Audi's trade mark, the optical array is by close-packed arrays in four light that same straight line or close-packed arrays are rectangle
Learn component composition；Each optical module inner light source is emitted light direction towards slightly deviating at the center of optical array, makes each optical module
The ring-shaped light spot of generation shifts and is superimposed on shadow surface.
The optical module of the optical array for generating four ring patterns is also interior to set barn door to cut down Bright folding part
Light intensity；The barn door is the fanning strip made with opaque light absorbent；The barn door be placed in light source and refractor by
Between smooth surface, the vertex of fan-shaped barn door is located at refractor the center point, and it is adjacent that the arc of fan-shaped barn door is located at two optical modules
At the rims of the lens of position.
The sector barn door quantity is two or more, and each sector barn door is set to lens light-receiving surface angularly in relation to one another
On.
The light source is semiconductor laser or LED light source.
The calculation method of the tooth form coordinate point set of the light-emitting surface of the refractor is divided into following steps；
The radius R that ring-shaped light spot is generated needed for A1, confirmation sets lens light-receiving surface and shadow surface by the size of greeting lamp
The distance between WD numerical value；
A2, by the wavelength of light source emergent light, determine the value of the Refractive Index of Material n of refractor；
A3, the ring-shaped light spot quantity according to required generation determine the number of optical of composition optical array, ring-shaped light spot
Number is number of optical；
A4, the diameter that refractor is determined according to the size of greeting lamp, number of optical are needed further according to actual processing
Determine the concentric teeth number of rings amount i on each refractor, by the light-emitting surface that each concentric ring gear is uniformly covered with refractor come into
Row is designed and is calculated, so that it is determined that the facewidth p of each concentric ring gear；
A5, tooth form inclined-plane midpoint is calculated on each concentric ring gear section by formula 1 to the distance r of lens centre axisi；
A6, the tooth form inclination alpha that tooth form on each concentric ring gear section is calculated by formula 2i；
A7, the high h of tooth that tooth form on each concentric ring gear section is calculated by formula 3i；
A8, using the light-receiving surface of refractor as X-axis, the central axis of refractor is Y-axis, finds out tooth form coordinate point set.
The ring of light pattern method of adjustment of the optical array for generating four ring patterns successively includes the following steps；
B1, each optical module inner light source of adjustment are emitted light direction, are allowed to slightly deviate towards at the center of optical array, thus
The ring-shaped light spot for allowing each optical module to generate shifts and is superimposed on shadow surface；
B2, each optical module inner light source of fine tuning are emitted light direction, and the ring-shaped light spot for generating each optical module is in shadow surface
On superposition range reach desirable value；
B3, fan-shaped barn door is put in angularly in relation to one another on lens light-receiving surface, the vertex of fan-shaped barn door is located at refraction
The arc of lens the center point, fan-shaped barn door is located at the rims of the lens of two optical module adjacent positions；
B4, the quantity for adjusting fan-shaped barn door and position, make the light intensity at ring-shaped light spot superposition cut down to ring-shaped light spot
Other positions are close or identical；
B5, fan-shaped barn door is fixed on lens light-receiving surface.
The present invention obtains ring of light pattern by class Fresnel reflections optical element；Optical system includes light source assembly, class phenanthrene
Nie Er refraction optical element and barn door composition, can obtain higher optical efficiency；Source light is through class Fresnel reflections
Optical element directly generates spot pattern, is not lost, and higher brightness, while product size can be realized with lower power consumption
Lightly, it is easily installed, and since structure is simplified, so that the anti-seismic performance of this product is more preferable.
When the present invention is for generating four ring patterns of Audi's trade mark, the optical array is by close-packed arrays in same straight line
Or close-packed arrays are four optical modules composition of rectangle；Each optical module inner light source is emitted light direction towards the center of optical array
Place's slightly offset, the ring-shaped light spot for generating each optical module shift and are superimposed on shadow surface；The design is so that this hair
Bright optical design can easily be accommodated, it is only necessary to light source light direction is finely adjusted, and product structure is extremely compact, it is more suitable
For automobile.
This patent directly generates spot pattern by class Fresnel reflections optical element, without make printing layer, the film or
It is diffraction element, without Miniature projection lens.The illuminator has image clearly, and capacity usage ratio is high, image depth of focus
Greatly, the advantages that at low cost
Since this patent generates ring-shaped light spot with lens focus, light spot shape is formed by focused light passages, and focused light passages are long,
Therefore not stringent to the required distance of shadow surface, even if having shadow surface distance due to vehicle driving or vehicle are stopped at uneven road surface
Deviate or tilt, the vertical view of ring-shaped light spot generated is not easy to produce excessive deformation to shape.
Detailed description of the invention
The present invention is described in more detail with reference to the accompanying drawings and detailed description:
Attached drawing 1 is schematic diagram of the invention；
Attached drawing 2 is the cut-away illustration of optical module of the present invention；
When attached drawing 3 is that optical module of the present invention is arranged in a straight line, distribution schematic diagram of the barn door on refractor；
When attached drawing 4 is optical module rectangular arranged of the present invention, distribution schematic diagram of the barn door on refractor；
Attached drawing 5 is the schematic diagram that the present invention generates four ring patterns shaped like Audi's trade mark；
Attached drawing 6 is the flare three-dimensional schematic diagram that the present invention generates four ring patterns shaped like Audi's trade mark；
In figure: 1- barn door；2- refractor；3- light source；4- ring-shaped light spot；The superposition range of 5- ring-shaped light spot；6- shines
Penetrate face；7- ring gear；8- optical array；9- optical module.
Specific embodiment
As shown in Figs 1-4, a kind of welcome's lamp optical system and its design method generating the ring of light, can be with class Fresnel Lenses
Optical focus reflect on shadow surface generate ring-shaped light spot 4, welcome's lamp optical system includes shadow surface 6 and optical array
8, the optical array 8 is made of several optical modules 9；The optical module 9 includes light source 3 and circular refractor 2, folding
It is parallel with shadow surface 6 to penetrate lens 2, the light source 3 is located at 2 light-receiving surface side of refractor, the refractor of each optical module 9 by
Smooth surface is in the same plane；3 emergent light of light source is directional light.
The light-emitting surface of the refractor 2 is equipped with the concentric ring gear 7 of i section indention shape, 7 center of circle of ring gear and folding
The center of circle for penetrating lens 2 is overlapped, and the tooth form inclination angle of the zigzag fashion is α, a height of h of tooth, and the facewidth of each tooth form is identical and is p,
The radial distance of the tooth form inclined-plane midpoint of i-th ring to central axis is ri, the bottom of the tooth of zigzag fashion is generally aligned in the same plane.
When light source emergent light is perpendicular to refractor light-receiving surface, the Refractive Index of Material of refractor is n, lens light-receiving surface with
The distance between shadow surface be WD, it is desirable that lens on light source emergent light be focused refraction be allowed on shadow surface formed radius be
When the round ring-shaped light spot of R,
The r of the tooth form of the zigzag fashion of i-th ring geariAccounting equation is；
Formula 1
In the zigzag fashion of i-th ring gear, sawtooth is on one side perpendicular to lens light-receiving surface；Sawtooth another side is and lens light-receiving surface
The angle of the chamfered edge of angled setting, chamfered edge and lens light-receiving surface is tooth form inclination angle, the tooth form inclination alpha of i-th ring geari
Accounting equation is；
Formula 2
The high h of the tooth of i-th ring geariAccounting equation is；
3 h of formulai=p × tan (αi)。
When require optical array generate four ring-shaped light spots 4, and ring-shaped light spot arrange on the same line simultaneously superposition forming
As Audi's trade mark four ring patterns when, the optical array is by close-packed arrays in four that same straight line or close-packed arrays are rectangle
Optical module composition；Each optical module inner light source is emitted light direction towards slightly deviating at the center of optical array, makes each optics group
The ring-shaped light spot that part generates shifts and is superimposed on shadow surface.
The optical module of the optical array for generating four ring patterns is also interior to set barn door 1 to cut down Bright folding part
Light intensity；The barn door 1 is the fanning strip made with opaque light absorbent；The barn door be placed in light source and refractor by
Between smooth surface, the vertex of fan-shaped barn door 1 is located at 2 the center point of refractor, and the arc of fan-shaped barn door is located at two optical module phases
At the rims of the lens that ortho position is set.
The sector barn door quantity is two or more, and each sector barn door is set to lens light-receiving surface angularly in relation to one another
On.
The light source is semiconductor laser or LED light source.
The calculation method of the tooth form coordinate point set of the light-emitting surface of the refractor is divided into following steps；
The radius R that ring-shaped light spot is generated needed for A1, confirmation sets lens light-receiving surface and shadow surface by the size of greeting lamp
The distance between WD numerical value；
A2, by the wavelength of light source emergent light, determine the value of the Refractive Index of Material n of refractor；
A3, the ring-shaped light spot quantity according to required generation determine the number of optical of composition optical array, ring-shaped light spot
Number is number of optical；
A4, the diameter that refractor is determined according to the size of greeting lamp, number of optical are needed further according to actual processing
Determine the concentric teeth number of rings amount i on each refractor, by the light-emitting surface that each concentric ring gear is uniformly covered with refractor come into
Row is designed and is calculated, so that it is determined that the facewidth p of each concentric ring gear；
A5, tooth form inclined-plane midpoint is calculated on each concentric ring gear section by formula 1 to the distance r of lens centre axisi；
A6, the tooth form inclination alpha that tooth form on each concentric ring gear section is calculated by formula 2i；
A7, the high h of tooth that tooth form on each concentric ring gear section is calculated by formula 3i；
A8, using the light-receiving surface of refractor as X-axis, the central axis of refractor is Y-axis, finds out tooth form coordinate point set.
The ring of light pattern method of adjustment of the optical array for generating four ring patterns successively includes the following steps；
B1, each optical module inner light source of adjustment are emitted light direction, are allowed to slightly deviate towards at the center of optical array, thus
The ring-shaped light spot for allowing each optical module to generate shifts and is superimposed on shadow surface；
B2, each optical module inner light source of fine tuning are emitted light direction, and the ring-shaped light spot for generating each optical module is in shadow surface
On superposition range 5 reach desirable value；
B3, fan-shaped barn door is put in angularly in relation to one another on lens light-receiving surface, the vertex of fan-shaped barn door is located at refraction
The arc of lens the center point, fan-shaped barn door is located at the rims of the lens of two optical module adjacent positions；
B4, the quantity for adjusting fan-shaped barn door and position, make the light intensity at ring-shaped light spot superposition cut down to ring-shaped light spot
Other positions are close or identical；
B5, fan-shaped barn door is fixed on lens light-receiving surface.
Embodiment 1:
Greeting lamp of the invention is arranged in the automobile of Audi's board below rearview mirror or below car door, when automobile unlock or
When being car door opening, the downward projected spot of greeting lamp can produce on the ground (shadow surface) below rearview mirror or below car door
Four ring patterns of raw Audi's trade mark are formed since this four ring patterns is based on lens focus optical path, to the height essence of greeting lamp
Spend it is of less demanding (namely of less demanding to the accuracy of the distance between lens light-receiving surface and shadow surface), when vehicle travels or
When vehicle is stopped at uneven road surface, the vertical view of four ring patterns of greeting lamp projection remains to be held essentially constant to shape.
Claims (7)
1. a kind of welcome's lamp optical system for generating the ring of light can be reflected raw on shadow surface with the optical focus of class Fresnel Lenses
Circularize hot spot, it is characterised in that: welcome's lamp optical system includes shadow surface and optical array, if the optical array by
Dry optical module composition；The optical module includes light source and circular refractor, and refractor is parallel with shadow surface, described
Light source is located at refractor light-receiving surface side, and the refractor light-receiving surface of each optical module is in the same plane；The light source
Emergent light is directional light；
The light-emitting surface of the refractor is equipped with the concentric ring gear of i section indention shape, the ring gear center of circle and refractor
The center of circle be overlapped, the tooth form inclination angle of the zigzag fashion is α, a height of h of tooth, and the facewidth of each tooth form is identical and is p, the i-th ring
The radial distance of tooth form inclined-plane midpoint to central axis is ri, the bottom of the tooth of zigzag fashion is generally aligned in the same plane；
When light source emergent light is perpendicular to refractor light-receiving surface, the Refractive Index of Material of refractor is n, lens light-receiving surface and irradiation
The distance between face is WD, it is desirable that lens on light source emergent light is focused refraction and is allowed to form radius on shadow surface to be R's
When round ring-shaped light spot,
The r of the tooth form of the zigzag fashion of i-th ring geariAccounting equation is；
Formula 1In the zigzag fashion of i-th ring gear, sawtooth is on one side perpendicular to lens light-receiving surface；Sawtooth is another
The angle of the chamfered edge of the angled setting of Bian Weiyu lens light-receiving surface, chamfered edge and lens light-receiving surface is tooth form inclination angle, described i-th
The tooth form inclination alpha of ring geariAccounting equation is；
Formula 2
The high h of the tooth of i-th ring geariAccounting equation is；
3 h of formulai=p × tan (αi)。
2. a kind of welcome's lamp optical system for generating the ring of light according to claim 1, it is characterised in that: when requiring optics battle array
Four ring-shaped light spots of column-generation, and ring-shaped light spot arranges on the same line and four ring patterns of superposition forming such as Audi's trade mark
When, the optical array is made of close-packed arrays in four optical modules that same straight line or close-packed arrays are rectangle；Each optics
Component inner light source is emitted light direction towards slightly deviating at the center of optical array, and the ring-shaped light spot for generating each optical module is shining
It penetrates on face and shifts and be superimposed.
3. a kind of welcome's lamp optical system for generating the ring of light according to claim 2, it is characterised in that: the generation Fourth Ring
The optical module of the optical array of pattern is also interior to set barn door to cut down the light intensity of Bright folding part；The barn door is with not
The fanning strip of transparent light absorbent production；The barn door is placed between light source and refractor light-receiving surface, fan-shaped barn door
Vertex is located at refractor the center point, and the arc of fan-shaped barn door is located at the rims of the lens of two optical module adjacent positions.
4. a kind of welcome's lamp optical system for generating the ring of light according to claim 3, it is characterised in that: the sector shading
Plate quantity is two or more, and each sector barn door is set to angularly in relation to one another on lens light-receiving surface.
5. a kind of welcome's lamp optical system for generating the ring of light according to claim 4, it is characterised in that: the light source is half
Conductor laser or LED light source.
6. a kind of welcome's lamp optical system for generating the ring of light according to claim 5, it is characterised in that: the refractor
The calculation method of tooth form coordinate point set of light-emitting surface be divided into following steps；
The radius R that ring-shaped light spot is generated needed for A1, confirmation is set between lens light-receiving surface and shadow surface by the size of greeting lamp
Distance WD numerical value；
A2, by the wavelength of light source emergent light, determine the value of the Refractive Index of Material n of refractor；
A3, the ring-shaped light spot quantity according to required generation, determine the number of optical of composition optical array, and ring-shaped light spot number is
For number of optical；
A4, the diameter that refractor is determined according to the size of greeting lamp, number of optical need true further according to actual processing
Concentric teeth number of rings amount i on fixed each refractor, is uniformly covered with the light-emitting surface of refractor by each concentric ring gear to be set
It counts and calculates, so that it is determined that the facewidth p of each concentric ring gear；
A5, tooth form inclined-plane midpoint is calculated on each concentric ring gear section by formula 1 to the distance r of lens centre axisi；
A6, the tooth form inclination alpha that tooth form on each concentric ring gear section is calculated by formula 2i；
A7, the high h of tooth that tooth form on each concentric ring gear section is calculated by formula 3i；
A8, using the light-receiving surface of refractor as X-axis, the central axis of refractor is Y-axis, finds out tooth form coordinate point set.
7. a kind of welcome's lamp optical system for generating the ring of light according to claim 6, it is characterised in that: the generation Fourth Ring
The ring of light pattern method of adjustment of the optical array of pattern successively includes the following steps；
B1, each optical module inner light source of adjustment are emitted light direction, are allowed to slightly deviate towards at the center of optical array, to allow each
The ring-shaped light spot that optical module generates shifts and is superimposed on shadow surface；
B2, each optical module inner light source of fine tuning are emitted light direction, and the ring-shaped light spot for generating each optical module is on shadow surface
Superposition range reaches desirable value；
B3, fan-shaped barn door is put in angularly in relation to one another on lens light-receiving surface, the vertex of fan-shaped barn door is located at refractor
The arc of the center point, fan-shaped barn door is located at the rims of the lens of two optical module adjacent positions；
B4, the quantity for adjusting fan-shaped barn door and position, cut down the light intensity at ring-shaped light spot superposition to other with ring-shaped light spot
Position is close or identical；
B5, fan-shaped barn door is fixed on lens light-receiving surface.
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| WO1982003676A1 (en) * | 1981-04-20 | 1982-10-28 | Masataka Negishi | Photoimage control device |
| CN201652097U (en) * | 2010-01-29 | 2010-11-24 | 中国计量学院 | LED automotive headlamp |
| CN105299560A (en) * | 2015-10-20 | 2016-02-03 | 浙江科技学院 | Laser car courtesy lamp optical system formed by combining diffraction optical element and laser device |
| CN105402673A (en) * | 2015-11-26 | 2016-03-16 | 马瑞利汽车零部件(芜湖)有限公司 | Composite light homogenizing car lamp |
| CN105807345A (en) * | 2016-04-28 | 2016-07-27 | 格莱特（天津）光电科技有限公司 | Fresnel lens for forming annular light spot |
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