CN209511892U - A kind of flashlight lens system of rectangular light spot - Google Patents
A kind of flashlight lens system of rectangular light spot Download PDFInfo
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- CN209511892U CN209511892U CN201920336769.9U CN201920336769U CN209511892U CN 209511892 U CN209511892 U CN 209511892U CN 201920336769 U CN201920336769 U CN 201920336769U CN 209511892 U CN209511892 U CN 209511892U
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Abstract
The utility model system provides a kind of flashlight lens system of rectangular light spot, including light source, the light-emitting surface of light source is equipped with microlens array, microlens array includes integrally formed several lenticule units, lenticule unit includes prismatic lens portion, prismatic lens portion is by one end of close to sources integrally formed with optical lens portion is entered, and the one end of prismatic lens portion far from light source is integrally formed with luminous lens portion；Prismatic lens portion and enter to be equipped between optical lens portion into light rectangular shaped rim, the length of the length and vertical direction that enter optical moment shape frame horizontal direction is respectively a and b, the focal length in luminous lens portion meets following equation: f=(a/2)/(HFOV/2), prismatic lens portion with a thickness of t=f, the radius of curvature in luminous lens portion is r=((n-1)/n) * f.The utility model forms a sufficiently large rectangular light spot using the rectangle image of a large amount of discretizations, and the utilization rate of luminous energy is high, and the serious forgiveness of assembly is high, and the light-emitting window area of system is small.
Description
Technical field
The utility model relates to flashlight lens systems, specifically disclose a kind of flashlight lens system of rectangular light spot.
Background technique
Flash lamp is one of the mode for reinforcing light exposure, is mainly used for shooting field, in the environment of insufficient light, camera shooting
Head needs to cooperate flash lamp that can obtain shooting effect limpid in sight.Flash lamp is widely used in various electronic products,
Mobile phone flashlight, tablet computer flash lamp are all the applications of mainstream instantly.
Flash lamp refers generally to entire flashlight lens system, mainly includes light source and lens.Existing flashlight lens system
A LED lamp bead or plurality of LEDs lamp bead is arranged as light source in system, and the shape of lens is often provided in round, and also has part to be set as
It is rectangular, the flashlight lens system of single LED lamp bead is set, no matter lens be shaped to it is round or rectangular, lens
Surface is both provided with circular Fresnel lines, if setting plurality of LEDs lamp bead, there is the circle of corresponding number on the surface of lens
Fresnel lines, the hot spot finally obtained are close to circular symmetrical hot spot.The shooting visual field of mobile phone camera is rectangle, circle
The hot spot of shape needs fully wrapped around rectangular field to be just able to satisfy exposure demand, but can have a large amount of invalid hot spot range in this way,
This flashlight lens system is lower to the utilization rate of luminous energy, and energy waste is larger.In addition, the appearance of existing flashlight lens system
Error rate is smaller, and in assembly, the center of circle of Fresnel lines must be aligned with the center of LED lamp bead in lens, general precision prescribed
In 0.1mm, the hot spot otherwise finally obtained can be obvious asymmetric, and the uniformity of hot spot will be decreased obviously, and especially be applied
In double-colored flash lamp, if the center of two lens is not aligned with respective LED lamp bead, it will appear apparent color difference.
Utility model content
Based on this, it is necessary to it is directed to prior art problem, a kind of flashlight lens system of rectangular light spot is provided, luminous energy
Utilization rate is high, and the serious forgiveness of assembly is high, and the light-emitting window area of system entirety is small, meets Miniaturization Design.
To solve prior art problem, the utility model discloses a kind of flashlight lens system of rectangular light spot, including light
The light-emitting surface in source, light source is equipped with microlens array, and microlens array includes integrally formed several lenticule units, lenticule list
Member includes prismatic lens portion, and by one end of close to sources integrally formed with optical lens portion is entered, prismatic lens portion is separate in prismatic lens portion
One end of light source is integrally formed with luminous lens portion；Prismatic lens portion and enter to be equipped between optical lens portion into light rectangular shaped rim, enter
The length in optical moment shape frame horizontal direction and the length of vertical direction are respectively a and b, and the focal length of a ≠ b, luminous lens portion meet
Following equation: f=(a/2)/(HFOV/2), HFOV are the field angle on the direction a, prismatic lens portion with a thickness of t=f, light out
The radius of curvature of lens section is r=((n-1)/n) * f, and n is the refractive index of lenticule unit.
Further, the light-emitting surface of light source is the square of k*k, and microlens array includes i*j lenticule unit, k < i*
A < 1.5k, k < j*b < 1.5k.
Further, i*a=1.2k, k < j*b=1.2k.
Further, 0.05mm≤a≤0.5mm, 0.05mm≤b≤0.5mm.
Further, the focal length for entering optical lens portion is p=f, and the radius of curvature for entering optical lens portion is q=r.
Further, entering optical lens portion is non-spherical lens, and entering the radius of curvature at optical lens portion center is q=r.
Further, luminous lens portion is non-spherical lens, and the radius of curvature at luminous lens portion center is r.
Further, collimation lens is equipped between light source and microlens array.
Further, collimation lens is Fresnel Lenses, and the optical axis of collimation lens and the optical axis of light source are coaxial.
The utility model has the following beneficial effects: the utility model discloses a kind of flashlight lens system of rectangular light spot, lead to
Image-forming principle is crossed, forms a sufficiently large rectangular light spot using the rectangle image of a large amount of discretizations, rectangular light spot is slightly larger than square
Shape visual field, shape size match almost without energy dissipation, and the utilization rate of luminous energy is high, each lenticule list in microlens array
Member is all equivalent, even if microlens array and light source have biggish deviation when assembling, final obtained rectangular light spot or symmetrical
, the serious forgiveness of assembly is high, and assembly manipulation is convenient, and since rectangular light spot is obtained using image-forming principle, thus system is whole
Light-emitting window area may be configured as slightly larger than light source, the light-emitting window area of system is small, can satisfy miniaturization of electronic products instantly
The demand of design.
Detailed description of the invention
Fig. 1 is the schematic perspective view of the utility model embodiment one.
Fig. 2 is the schematic view of the front view of the utility model embodiment one.
Fig. 3 is the structural schematic diagram of lenticule unit in the utility model.
Fig. 4 is the rectangular light spot illumination figure of the utility model embodiment two.
Fig. 5 is the schematic perspective view of the utility model embodiment two.
Fig. 6 is the schematic view of the front view of the utility model embodiment two.
Fig. 7 is the rectangular light spot illumination figure of the utility model embodiment two.
Appended drawing reference are as follows: light source 10, microlens array 11, collimation lens 12, lenticule unit 20, enter optical lens portion 21,
Prismatic lens portion 22 enters light rectangular shaped rim 221, luminous lens portion 23.
Specific embodiment
For the feature, technological means and specific purposes achieved, function that can further appreciate that the utility model, below
The utility model is described in further detail in conjunction with attached drawing and specific embodiment.
Referring to figs. 1 to Fig. 7.
The utility model embodiment one discloses a kind of flashlight lens system of rectangular light spot, as shown in Figure 1-3, include light
Source 10, it is preferable that light source 10 is LED lamp bead, and the light-emitting surface of light source 10 is equipped with microlens array 11, and microlens array 11 includes one
Body formed several lenticule units 20, i.e., several lenticule units 20, which are arranged in array to be integrally formed, obtains microlens array
11, lenticule unit 20 includes prismatic lens portion 22, and prismatic lens portion 22 is saturating integrally formed with light is entered by one end of close to sources 10
Mirror portion 21, the one end of prismatic lens portion 22 far from light source 10 is integrally formed with luminous lens portion 23, it is preferable that enters optical lens portion 21
It is plano-convex lens structure with luminous lens portion 23, prismatic lens portion 22 is straight quadrangular lens arrangement, each prismatic lens portion
22 side contact is connected, the refractive index continuous phase etc. of 20 inside various pieces of lenticule unit；Prismatic lens portion 22 and enter light
It is equipped between lens section 21 into light rectangular shaped rim 221, enters light rectangular shaped rim 221 and be located at prismatic lens portion 22 and enter optical lens portion 21
Joint face on, the length of the length and vertical direction that enter 221 horizontal direction of light rectangular shaped rim is respectively a and b, a ≠ b, preferably
The focal length on ground, a:b 4:3, luminous lens portion 23 meets following equation: f=(a/2)/(HFOV/2), HFOV are on the direction a
Field angle, a are the length for entering light rectangular shaped rim 221 in horizontal direction, and HFOV is then the field angle in horizontal direction, prismatic lens
Portion 22 with a thickness of t=f, i.e., microlens array with a thickness of t=f, the field angle according to needed for light distribution, it is saturating that calculating obtains out light
The focal length in mirror portion 23, and set equal with focal length for the thickness of lenticule unit 20, can effectively it ensure into light rectangular shaped rim
221 on the focal plane in luminous lens portion 23, so that it is guaranteed that luminous lens can accurately be fallen by entering the image of light rectangular shaped rim 221
In portion 23, the radius of curvature in luminous lens portion 23 is r=((n-1)/n) * f, and n is the refractive index of lenticule unit 20.
When work, the light that light source 10 issues forms the light distribution effect of rectangular light spot after microlens array 11, specifically
Are as follows: the light that light source 10 issues is injected into optical lens portion 21, and light is irradiated to after light rectangular shaped rim 221 by prismatic lens portion
22 form the image into light rectangular shaped rim 221 in luminous lens portion 23, several partly overlap and the square of array arrangement in the same direction
The rectangle light distribution effect that size is sufficiently large and energy is sufficient is collectively formed in shape image, and light distribution hot spot is slightly larger than the square of camera
Shape visual field, shape size matching, almost without energy dissipation.The utility model adjusts the shape of hot spot by way of imaging,
Rather than it is adjusted by the refractive index difference of different directions merely, it can be ensured that the effect that light is adjusted, while can effectively reduce
The integrally-built size of microlens array 11, so as to effectively reduce the occupied space of flashlight lens system, i.e. flash lamp
The light-emitting window of lens system can obtain effective diminution, have great side for the design of small-sized electronic product such as mobile phone etc.
It helps, in addition, the center of microlens array 11 is not necessarily to be aligned with the center of light source 10, because each lenticule unit 20 is all equivalent
, even if turning be furnished with biggish deviation, hot spot is still symmetrically that the illumination figure of rectangular light spot is as shown in Figure 4.
The design method of the utility model, comprising the following steps:
A, microlens array 11 is set at the light-emitting surface of light source 10, is several micro- by 11 separate division of microlens array
Mirror unit 20, lenticule unit 20 is divided into set gradually enter optical lens portion 21, prismatic lens portion 22 and luminous lens portion
23, light rectangular shaped rim 221 is set between optical lens portion 21 and prismatic lens portion 22 entering；
B, be set into according to demand 221 horizontal direction of light rectangular shaped rim length and vertical direction length be a and b, a ≠
B, the light-emitting surface of light source 10 are the square of k*k, and microlens array 11 includes i*j lenticule unit 20, k < i*a < 1.5k, k <
J*b < 1.5k, light distribution field angle needed for horizontal direction is arranged are HFOV, are calculated under the focal length satisfaction for obtaining luminous lens portion 23
Formula: f=(a/2)/(HFOV/2)；
C, be arranged prismatic lens portion 22 with a thickness of t=f, i.e., microlens array with a thickness of t=f；
D, the radius of curvature that luminous lens portion 23 is arranged is r=((n-1)/n) * f, and n is the refractive index of lenticule unit 20.
The utility model forms a sufficiently large rectangular light by image-forming principle, using the rectangle image of a large amount of discretizations
Spot, rectangular light spot are slightly larger than rectangular field, and shape size matches almost without energy dissipation, and the utilization rate of luminous energy is high, micro-
Each lenticule unit 20 is all equivalent in lens array 11, even if having when microlens array 11 and the assembly of light source 10 biggish inclined
Difference, final obtained rectangular light spot or symmetrical, the serious forgiveness of assembly is high, and assembly manipulation is convenient, since rectangular light spot is to utilize
What image-forming principle obtained, thus the light-emitting window area of system entirety may be configured as slightly larger than light source 10, the light-emitting window area of system
It is small, it can satisfy the demand of miniaturization of electronic products design instantly.
In the present embodiment, the light-emitting surface of light source 10 is the square of k*k, and microlens array 11 includes i*j lenticule
Unit 20, k < i*a < 1.5k, k < j*b < 1.5k reduce the area of microlens array 11 according to demand and are allowed to matching greater than light
The light-emitting surface in source 10, can effectively ensure to issue light source 10 utilization rate of luminous energy, while can effectively reduce flashlight lens
The light-emitting window diameter of system.
Based on the above embodiment, the size of microlens array 11 is arranged in i*a=1.2k, k < j*b=1.2k under normal circumstances
It is 1.2 times of 10 light-emitting surface of light source, it can be ensured that the utilization rate of luminous energy, while can ensure the size foot of microlens array 11
Enough small, the size of light-emitting window will be set as 3~4 times of 10 light-emitting surface size of light source in traditional flashlight lens system, this
The setting of utility model can significantly reduce the light-emitting window size of flashlight lens system, to the cloth of the miniaturized electronics such as mobile phone
Office provides splendid design basis.
Based on the above embodiment, 0.05mm≤a≤0.5mm, 0.05mm≤b≤0.5mm are arranged single according to application demand
The size of lenticule unit 20, the size in range above is easy to process, and light regulation performance is good.
In the present embodiment, the focal length for entering optical lens portion 21 is p=f, and the radius of curvature for entering optical lens portion 21 is q=r, is entered
Optical lens portion 21 is mainly used for collecting the light in light source 10, is set into focal length and the prismatic lens portion 22 in optical lens portion 21
Thickness matching, so that it is guaranteed that entering the equivalent focus in optical lens portion 21 in luminous lens portion 23, so as to significantly improve light
The utilization rate of energy.
Based on the above embodiment, entering optical lens portion 21 is non-spherical lens, enters the radius of curvature at 21 center of optical lens portion
For q=r, for the uniformity for further increasing light distribution, being set into optical lens portion 21 is non-spherical lens, the curvature centered on p
Radius can obtain circular cone coefficient and other asphericity coefficients into optical lens portion 21 by software optimization according to demand.
In the present embodiment, luminous lens portion 23 is non-spherical lens, and the radius of curvature at 23 center of luminous lens portion is
R, to further increase imaging effect, setting luminous lens portion 23 is non-spherical lens, the radius of curvature centered on r, according to
Demand can obtain the circular cone coefficient and other asphericity coefficients in luminous lens portion 23 by software optimization.
Embodiment two is based on embodiment one, and it is saturating to be equipped with collimation as seen in figs. 5-6, between light source 10 and microlens array 11
Mirror 12, setting collimation lens 12 can further increase the utilization rate to the issued luminous energy of light source 10, while can further mention
The illumination figure of the uniformity of high light distribution, rectangular light spot is as shown in Figure 7.
Based on the above embodiment, collimation lens 12 is Fresnel Lenses, the optical axis of collimation lens 12 and the optical axis of light source 10
It is coaxial, the utilization rate to luminous energy can be further increased, while can be improved light distribution effect.
Above-described embodiments merely represent several embodiments of the utility model, the description thereof is more specific and detailed,
But it should not be understood as limiting the scope of the patent of the utility model.It should be pointed out that for the common of this field
For technical staff, without departing from the concept of the premise utility, various modifications and improvements can be made, these all belong to
In the protection scope of the utility model.Therefore, the scope of protection shall be subject to the appended claims for the utility model patent.
Claims (9)
1. a kind of flashlight lens system of rectangular light spot, which is characterized in that including light source (10), the light source (10) goes out light
Face is equipped with microlens array (11), and the microlens array (11) includes integrally formed several lenticule units (20), described
Lenticule unit (20) includes prismatic lens portion (22), one end one of the prismatic lens portion (22) close to the light source (10)
It forms into optical lens portion (21), the one end of the prismatic lens portion (22) far from the light source (10) is saturating integrally formed with light out
Mirror portion (23)；The prismatic lens portion (22) and it is described enter optical lens portion (21) between be equipped with into light rectangular shaped rim (221), it is described
The length of the length and vertical direction that enter light rectangular shaped rim (221) horizontal direction is respectively a and b, a ≠ b, the luminous lens portion
(23) focal length meets following equation: f=(a/2)/(HFOV/2), HFOV are the field angle on the direction a, the prismatic lens portion
(22) with a thickness of t=f, the radius of curvature of the luminous lens portion (23) is r=((n-1)/n) * f, and n is the lenticule list
The refractive index of first (20).
2. a kind of flashlight lens system of rectangular light spot according to claim 1, which is characterized in that the light source (10)
Light-emitting surface be k*k square, the microlens array (11) includes i*j lenticule unit (20), k < i*a < 1.5k, k <
j*b<1.5k。
3. a kind of flashlight lens system of rectangular light spot according to claim 2, which is characterized in that i*a=1.2k, k <
J*b=1.2k.
4. a kind of flashlight lens system of rectangular light spot according to claim 2 or 3, which is characterized in that 0.05mm≤a
≤ 0.5mm, 0.05mm≤b≤0.5mm.
5. a kind of flashlight lens system of rectangular light spot according to claim 1, which is characterized in that it is described enter optical lens
The focal length in portion (21) be p=f, it is described enter optical lens portion (21) radius of curvature be q=r.
6. a kind of flashlight lens system of rectangular light spot according to claim 5, which is characterized in that it is described enter optical lens
Portion (21) be non-spherical lens, it is described enter optical lens portion (21) center at radius of curvature be q=r.
7. a kind of flashlight lens system of rectangular light spot according to claim 1, which is characterized in that the luminous lens
Portion (23) is non-spherical lens, and the radius of curvature at luminous lens portion (23) center is r.
8. a kind of flashlight lens system of rectangular light spot according to claim 1, which is characterized in that the light source (10)
Collimation lens (12) are equipped between the microlens array (11).
9. a kind of flashlight lens system of rectangular light spot according to claim 8, which is characterized in that the collimation lens
It (12) is Fresnel Lenses, the optical axis of the collimation lens (12) is coaxial with the optical axis of the light source (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920336769.9U CN209511892U (en) | 2019-03-18 | 2019-03-18 | A kind of flashlight lens system of rectangular light spot |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920336769.9U CN209511892U (en) | 2019-03-18 | 2019-03-18 | A kind of flashlight lens system of rectangular light spot |
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| Publication Number | Publication Date |
|---|---|
| CN209511892U true CN209511892U (en) | 2019-10-18 |
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| CN201920336769.9U Withdrawn - After Issue CN209511892U (en) | 2019-03-18 | 2019-03-18 | A kind of flashlight lens system of rectangular light spot |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109827149A (en) * | 2019-03-18 | 2019-05-31 | 广东烨嘉光电科技股份有限公司 | A kind of the flashlight lens system and its design method of rectangular light spot |
-
2019
- 2019-03-18 CN CN201920336769.9U patent/CN209511892U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109827149A (en) * | 2019-03-18 | 2019-05-31 | 广东烨嘉光电科技股份有限公司 | A kind of the flashlight lens system and its design method of rectangular light spot |
| CN109827149B (en) * | 2019-03-18 | 2023-09-22 | 广东烨嘉光电科技股份有限公司 | Flash lamp lens system with rectangular light spots and design method thereof |
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