CN213712982U

CN213712982U - Small-angle lens system

Info

Publication number: CN213712982U
Application number: CN202120041527.4U
Authority: CN
Inventors: 潘淑军; 伍德生; 吴海生; 何东照
Original assignee: NVC Lighting Technology Corp
Current assignee: NVC Lighting Technology Corp
Priority date: 2021-01-07
Filing date: 2021-01-07
Publication date: 2021-07-16
Anticipated expiration: 2031-01-07

Abstract

The utility model discloses a low-angle lens system, including light source spare and lens, light source spare with lens have following relation: when the emergent angle of the lens is 10 degrees, b/a is 10 degrees, and b/h is 2 degrees; when the emergent angle of the lens is 5 degrees, b/a is 20, and b/h is 2; in the formula: the a is the diameter of the light emitting surface of the light source device, and the b is the diameter of the light emitting surface of the lens; the h is the height of the lens; an opaque blocking member is also disposed in the middle of the lens. According to the small-angle lens system, the minimum lens size meeting the angle requirement can be designed quickly according to a given light source part through the diameter of the light emitting surface of the light source part and the relation between the diameter of the light emitting surface of the light source part and the diameter and the height of the light emitting surface of the lens, the opaque blocking part can block light rays emitted from the middle of the lens, stray light emitted from the lens can be eliminated, and the light spot effect of the whole lens system is ensured.

Description

Small-angle lens system

Technical Field

The utility model belongs to the technical field of the technique of LED key illumination and specifically relates to a need low-angle lens system of low-angle grading.

Background

In an accent lighting lamp, such as a spot lamp, a small-angle light distribution is required for an optical component. The optical system with small-angle light distribution has a small irradiation range and high central light intensity, and can be expanded to other small-angle lamps including spot lamps.

At present, the lamp with small-angle light distribution has the following problems: (1) specification parameters of the small-angle lens cannot be determined, after the size of a light emitting surface of the light source is given, contradiction exists between the size of the lens and material selection, the larger the size of the lens is, the smaller the angle can be designed, but the lens material and lamp material are wasted; (2) in the light spot of the small angle lens, there is generally a heavy macula and stray light, resulting in a limitation of the optical effect of the small angle lamp in application.

The chinese patent publication No. CN211925660U provides a very small angle LED lamp lens, which includes a lens body, the lens body is in a cone shape, and the lens body includes a receiving cavity, a first light incident surface, a second light incident surface, a total reflection surface, a first light emitting surface, and a second light emitting surface; the first light incident surface and the second light incident surface are arranged in the accommodating cavity; the accommodating cavity is arranged at the bottom of the lens body and used for accommodating an LED light source; the first light incident surface is a conical light incident surface, and the surface of the first light incident surface is a frosted surface. The light incident surface and the light emergent surface of the lens are both combined by curved surfaces, and the cambered surface and the inclination angle need to be determined in the production process, so that the lens is difficult to accurately control.

Therefore, it is necessary to optimally design the existing small-angle lens optical system, so that the lens and the light source device can be accurately adapted, and the lens is ensured to have a good light spot effect.

Disclosure of Invention

In order to solve the above-mentioned problem that prior art exists, the utility model provides a small-angle lens system, through the light emitting area diameter of light source spare to and its exit surface diameter and the relational expression of height with lens, can design out the minimum lens size that accords with the angle requirement according to given light source spare fast, can eliminate the stray light of lens outgoing moreover, guarantee whole lens system's facula effect.

In order to achieve the above object, the present invention provides the following technical solutions:

a small angle lens system comprising a light source element and a lens, the light source element and the lens having the following relationship:

when the emergent angle of the lens is 10 degrees, b/a is 10 degrees, and b/h is 2 degrees;

when the emergent angle of the lens is 5 degrees, b/a is 20, and b/h is 2;

in the formula:

the a is the diameter of the light emitting surface of the light source element,

b is the diameter of the light-emitting surface of the lens;

and h is the height of the lens.

In the lens system, after the light source part is given, the diameter of the light emitting surface of the light source part can be obtained, then the diameter and the height of the light emitting surface of the required lens can be obtained according to the relational expression, and then the minimum lens meeting the requirements of two common emergent angles of 5 degrees and 10 degrees is designed, so that the use of lens materials is reduced while the small-angle emergent is met, and the production cost is reduced.

As a further description of the technical solution of the present invention, an opaque blocking member is provided in the middle of the lens.

As the technical scheme of the utility model further describe, block and be located the plain noodles under, block with lens pass through ultrasonic bonding together fixedly.

As a further description of the technical solution of the present invention, the lens is in the light source has been seted up directly over, the cross-section of light entering is trapezoidal.

As a further description of the technical solution of the present invention, the diameter of the blocking member is slightly larger than the top diameter of the light inlet hole.

In the lens system, the opaque blocking piece is arranged in the middle of the lens and right below the light-emitting surface, the diameter of the blocking piece is slightly larger than the diameter of the top of the light-entering hole of the lens, most of light emitted from the center of the lens can be reflected back while light in the middle of the lens is abandoned, so that stray light emitted from the lens is blocked, the light spot effect of the whole lens system is ensured, and yellow spots on the periphery of light spots are reduced.

As a further description of the technical solution of the present invention, the blocking member is made of plastic material. The blocking piece made of the plastic material is of an opaque structure and can be fixed with the lens in an ultrasonic welding mode, so that light rays emitted from the middle of the lens are blocked, and the generation of yellow spots is reduced.

As a further description of the technical solution of the present invention, the light source is a COB light source. The COB light source is a high-power integrated surface light source, and the light emitting area and the overall dimension are determined according to the attached LED chip. The diameter and the height of the light emitting surface of the lens are correspondingly designed according to the diameter of the light emitting surface of the COB light source.

As a further description of the technical solution of the present invention, the lens is made of one of PMMA, PC or glass.

The PMMA, PC or glass lens ensures that the refractive index is larger than that of air, the light entering from the light inlet hole is refracted, and a part of the light is emitted out through the total reflection surface on the side surface of the lens; the other part of the light is emitted from the light-emitting surface at the top, and the light at the middle part is reflected back by the barrier and finally emitted from the light-emitting surface around the barrier, so that the emitting angle can be reduced, and yellow spots are prevented from appearing.

Based on foretell technical scheme, the utility model discloses the technological effect who gains does:

(1) the utility model provides a small-angle lens system, according to the light emitting area diameter and the corresponding relational expression of given light source spare, can obtain the light emitting area diameter and the height of required lens, and then design out and accord with 5 and 10 these two kinds of minimum lens of emergent angle requirements commonly used, also reduce the use of lens material when satisfying the small-angle outgoing, reduction in production cost.

(2) The utility model discloses a low-angle lens system has set up opaque in the middle part of lens and has blockked the piece, and its diameter is a bit bigger than the top diameter that lens entered the unthreaded hole, when giving up the light of lens middle part, can reflect the most of light of lens center outgoing back to block the stray light of following lens outgoing, guarantee whole lens system's facula effect, lightened facula outlying macula lutea.

Drawings

Fig. 1 is a schematic structural diagram of the small-angle lens system of the present invention.

Fig. 2 is a plan view of the light source device of the present invention.

Fig. 3 is a cross-sectional view of the low-angle lens system of the present invention.

Fig. 4 is a cross-sectional view of the lens of the present invention.

Fig. 5 is a light distribution curve diagram of the small-angle lens system of the present invention.

Detailed Description

To facilitate an understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings and specific examples. The preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

Example 1

Fig. 1 shows a schematic structural diagram of the small-angle lens system of the present embodiment, fig. 2 shows a top view of the light source device of the present embodiment, fig. 3 shows a cross-sectional view of the small-angle lens system of the present embodiment, fig. 4 is a cross-sectional view of the lens of the present embodiment, and with reference to fig. 1 to fig. 4, a small-angle lens system includes a light source device 1 and a lens 2, the light source device 1 is a COB light source, a certain number of LED chips are attached to a substrate 11 to form a light emitting module, the light emitting module is annularly emitted, and a diameter of a light emitting surface of the light emitting module is a.

The lens 2 disposed above the light source 1 needs to be designed according to the light emitting area and the external dimension of the light source to control the light of the light source 1. In the process of designing a small-angle lens, the light-emitting surface and the height of the lens are parameters which need to be considered in a key manner. The material of the lens 2 may be PMMA, PC or glass, and this embodiment is exemplified by a PMMA lens.

Taking the currently commonly used lens with small angle of 5 ° and 10 ° as an example, in this embodiment, the diameter b and height h of the light emitting surface of the lens and the diameter a of the light emitting surface of the light source device have the following relations:

when the emergent angle of the lens is 10 degrees, b/a is 10 degrees, and b/h is 2 degrees; that is, the ratio of the diameter b of the light emitting surface of the lens 2 to the diameter a of the light emitting surface of the light source element 1 is 10, and the value of b can be properly adjusted according to the arrangement of the LED chips in the COB light source.

When the emergent angle of the lens is 5 degrees, b/a is 20, and b/h is 2; that is, the ratio of the diameter b of the light emitting surface of the lens 2 to the diameter a of the light emitting surface of the light source element 1 is 20, and the value of b can be properly adjusted according to the arrangement of the LED chips in the COB light source.

After the value of the diameter b of the light-emitting surface is determined, the minimum angle under the condition of the diameter of the light-emitting surface can be designed according to the ratio of the diameter b of the light-emitting surface to the height h of the lens being 2.

It can be seen that, after a COB light source is given, the light emitting surface diameter of the light source can be obtained, the size of the lens is determined according to the above relation, the light emitting surface diameter and the height of the required lens are obtained, and then the minimum lens meeting the requirements of two common emergent angles of 5 degrees and 10 degrees is designed, so that the application requirement of a small angle is met, the whole research and development period is reduced, the use of the lens with a larger size is avoided, the use of lens materials is reduced while the small-angle emergent is met, and the production cost is reduced.

The top of the lens 2 is a light emitting surface 20, the bottom of the lens 2 is provided with a light inlet 22, and the light inlet 22 has a structure with a narrow top and a wide bottom, and the cross section of the light inlet is trapezoidal. The light source element 1 is disposed just below the light entrance hole 22. The light emitted by the light source part 1 is emitted through the lens 2, the emergent light is mainly divided into two parts, one part is reflected by the total reflection surface 24 on the side surface of the lens and then emitted from the emergent light surface 20, the angle of the light reflected by the total reflection surface 24 is small, light spots are concentrated, and yellow spots generally do not appear; the other part of the light directly exits through the light exit surface 20 of the lens, and because the light exit surface of the general lens has the function of a convex lens, the light exiting in the middle of the lens has a large angle, which greatly affects the light spot and is easy to have yellow spots.

In this embodiment, the opaque blocking member 21 is disposed in the middle of the lens 2, and the blocking member 21 is also located right below the light exit surface, and is made of plastic material, and can be fixed to the lens 2 by ultrasonic welding. As shown in FIG. 4, the diameter m of the blocking member 21 is set to be slightly larger than the diameter n of the top surface 23 of the light inlet 22, and the blocking member 21 can block the light emitted from the middle of the lens, thereby reducing the generation of macula lutea.

Fig. 5 shows a light distribution curve diagram of the small-angle lens system of the present embodiment, and as shown in fig. 5, the small-angle lens system of the present embodiment has a small irradiation range and high central light intensity.

In addition, in this embodiment, the opaque plastic blocking member is disposed in the middle of the lens, and the light in the middle of the lens is discarded, so that the effect of replacing the opaque plastic blocking member is as follows: most of light rays emitted from the center of the lens can be reflected back, so that stray light emitted from the lens is blocked, the light spot effect of the whole lens system is ensured, and the peripheral yellow spots of the light spots are reduced.

The foregoing is merely illustrative and explanatory of the structure of the present invention, which is described in more detail and with greater particularity, and is not to be construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, many variations and modifications are possible without departing from the inventive concept, and such obvious alternatives fall within the scope of the invention.

Claims

1. A small angle lens system comprising a light source element (1) and a lens (2), said light source element (1) and said lens (2) having the following relationship:

when the emergent angle of the lens (2) is 10 degrees, b/a is 10, and b/h is 2;

when the emergent angle of the lens (2) is 5 degrees, b/a is 20, and b/h is 2;

in the formula:

a is the diameter of the light emitting surface of the light source element (1),

the b is the diameter of the light-emitting surface of the lens (2);

the h is the height of the lens (2).

2. The small angle lens system according to claim 1, characterized in that the lens (2) is provided with an opaque barrier (21) in the middle.

3. The small-angle lens system according to claim 2, wherein the barrier (21) is located directly below the light exit surface (20), and the barrier (21) and the lens (2) are fixed together by ultrasonic welding.

4. The small-angle lens system according to claim 3, wherein the lens (2) is provided with a light inlet (22) directly above the light source (1), and the light inlet (22) has a trapezoidal cross section.

5. The small angle lens system of claim 4, wherein the diameter of the stop (21) is slightly larger than the diameter of the top (23) of the entrance aperture (22).

6. The small angle lens system of claim 2, wherein the stop (21) is plastic.

7. The small angle lens system of claim 1, wherein the light source element (1) is a COB light source.

8. The small angle lens system of claim 1, wherein the lens (2) is made of one of PMMA, PC or glass.