CN210462885U

CN210462885U - COB lens

Info

Publication number: CN210462885U
Application number: CN201921441694.7U
Authority: CN
Inventors: 姚斌
Original assignee: GUANGDONG HONGLEIDA OPTOELECTRONIC CO Ltd
Current assignee: GUANGDONG HONGLEIDA OPTOELECTRONIC CO Ltd
Priority date: 2019-08-30
Filing date: 2019-08-30
Publication date: 2020-05-05
Anticipated expiration: 2029-08-30

Abstract

The utility model relates to a COB lens, lens top surface are equipped with the optical cavity of indent, thereby the lateral wall of lens progressively draws in towards the optical cavity and forms curved first internal reflection face, and the bottom surface of lens is for going out the plain noodles, and the light that jets into from the optical cavity lateral wall is beaten after the refraction on the first internal reflection face and reflected by first internal reflection face go out the plain noodles, the bottom surface of optical cavity is protruding towards the optical cavity arc, is equipped with cyclic annular arch on this bottom surface, and the arch is encircleed the optical axis setting of lens and is invaginated in the optical cavity, and the lateral wall face of keeping away from the optical axis on the arch is curved second internal reflection face, and the arc center of second internal reflection face sets up towards the optical axis, and the lateral wall face that is close to the optical axis in the arch inclines so that can beat after the refraction from the light that this lateral wall face jets into to the direction of optical axis on. The utility model discloses a COB lens has characteristics small, that thickness is thin.

Description

COB lens

Technical Field

The utility model relates to a COB lens.

Background

Among the prior art, the COB lens is as shown in fig. 1, and its whole cup structure that is, cup structure's top surface are equipped with the optical cavity of indent, and optical cavity bottom surface a is protruding towards the optical cavity arc and is established to shine the line face in order to prevent the facula, and optical cavity side b sets up in parallel to optical axis o. The outer side wall of the COB lens is gradually folded towards the optical cavity to form an arc-shaped internal reflection surface c, the LED lamp beads are placed in the optical cavity, light rays are emitted into the COB lens from the side face b of the optical cavity, and then the light-emitting surface d of the bottom face of the COB lens is reflected out by the internal reflection surface c to achieve light guiding.

Among the above-mentioned COB lens structure, for satisfying the light r1 that penetrates into the COB lens from the crossing point between optical cavity bottom surface a and the optical cavity side b also can be reflected by internal reflection face c, internal reflection face c need possess sufficient length at the epaxial mapping distance of optical axis o, and this can require COB lens to set up sufficient thickness, leads to COB lens among the prior art generally thicker.

SUMMERY OF THE UTILITY MODEL

The utility model discloses an improve the weak point among the prior art, and provide a COB lens small, that thickness is thin.

Therefore, a COB lens is provided, wherein an inwards concave optical cavity is arranged on the top surface of the lens, the outer side wall of the lens gradually draws in towards the optical cavity to form a curved first internal reflection surface, the bottom surface of the lens is a light-emitting surface, light rays emitted from the side wall of the optical cavity are refracted and then emitted onto the first internal reflection surface and reflected out of the first internal reflection surface, the bottom surface of the optical cavity is convex towards the arc of the optical cavity, an annular bulge is arranged on the bottom surface, the bulge surrounds the optical axis of the lens and is internally sunk into the optical cavity, the side wall surface far away from the optical axis on the bulge is a curved second internal reflection surface, the arc center of the second internal reflection surface is arranged towards the optical axis, and the side wall surface close to the optical axis on the bulge inclines towards the direction close to the optical axis so that the light rays emitted from the side wall surface can be refracted and then emitted onto the second internal reflection surface.

Further, the side wall surface of the protrusion close to the optical axis is abutted against the side wall of the optical cavity.

Further, the side wall of the optical cavity is inclined towards the direction far away from the bottom surface of the optical cavity.

Further, the radian of the second internal reflection surface is smaller than that of the first internal reflection surface.

Further, the light emitting surface is concave towards the direction of the light cavity.

Furthermore, the part of the light emitting surface on the optical axis is convex towards the direction far away from the optical cavity.

Further, the bottom surface of the light cavity is a satin surface.

Has the advantages that:

this embodiment is through setting up the lateral wall face that is close to the optical axis on the arch and towards the direction slope that is close to the optical axis, let the light that jets into from this lateral wall face can be beaten on the second internal reflection face after the refraction, make the light that jets into COB lens from the crossing point between optical cavity bottom surface and this lateral wall face can be by the direct reflection of second internal reflection face, so, first internal reflection face need not establish as long as traditional so at the epaxial mapping distance of light, so the thickness of COB lens can be done thinly, realize that COB lens volume reduces, the purpose of thickness attenuation.

The above description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented according to the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more obvious and understandable, the following detailed description of the present invention is given.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:

fig. 1 shows a schematic structure of a COB lens in the related art;

fig. 2 shows a schematic structural diagram of a COB lens of the present invention;

fig. 3 shows a cross-sectional view of a COB lens of the present invention;

fig. 4 shows the internal optical path diagram of the COB lens of the present invention.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

The COB lens structure of this example is shown in fig. 2, and its cross-section along F-F is shown in fig. 3. See fig. 3, the whole cup-shaped structure that is of COB lens, its top surface are equipped with the optical cavity of indent, and the optical cavity is used for holding LED lamp pearl and gives out light. The outer side wall of the COB lens is gradually folded towards the optical cavity to form an arc-shaped internal reflection surface c2, the bottom surface of the COB lens is a light-emitting surface d, when the COB lens is used, the LED lamp beads in the optical cavity emit light, and the light is emitted into the COB lens from the optical cavity and is reflected out of the light-emitting surface d by the internal reflection surface c 2.

In order to make the COB lens thin, the optical cavity structure of the COB lens is improved in this embodiment.

Specifically, the light cavity bottom surface a protrudes towards the light cavity arc and is set as a pattern-shining surface, and the pattern-shining surface is used for scattering and homogenizing light rays entering the COB lens from the light cavity bottom surface a, so that light spots formed by the light rays emitted from the light-emitting surface d on the central line of the lens are avoided.

An annular protrusion is arranged around the bottom surface a of the optical cavity, and the protrusion is arranged around the optical axis o and is sunk in the optical cavity. The side wall surface c1 on the projection far from the optical axis o is an arc-shaped internal reflection surface, and the arc center of the arc is arranged towards the optical axis o. The side wall surface b1 on the projection near the optical axis o is inclined toward the direction near the optical axis a, so that the refraction angle of the light incident from this surface is increased, and the light incident from the side wall surface b1 is refracted and then strikes the internal reflection surface c 1.

Side wall face c1 and light chamber lateral wall b2 butt, light chamber lateral wall b2 also is the slope setting, thereby it makes the light chamber be convenient for LED lamp pearl embedding towards the direction slope of keeping away from optical axis a.

When in use, as shown in fig. 4, in the internal optical path diagram of the COB lens, a light ray r1 near the optical axis o enters from the side wall surface b1, and since the side wall surface b1 is inclined enough, the light ray r1 is refracted and then strikes the internal reflection surface c1, so that the light ray r is reflected by the internal reflection surface c1 and exits from the light exit surface d; the light ray r2 far from the optical axis o enters the optical cavity from the side wall b2 as usual, and after being refracted, the light ray strikes the internal reflection surface c2, and is reflected by the internal reflection surface c2 out of the light emitting surface d, so that different light guiding paths are distinguished.

Since the light r1 incident on the COB lens from the intersection point between the cavity bottom surface a and the side wall surface b1 can be directly reflected by the internal reflection surface c1, and the mapping distance of the internal reflection surface c2 on the optical axis o does not have to be as long as the conventional one, the thickness of the COB lens can be reduced, and the purposes of volume reduction and thickness reduction of the COB lens are achieved.

Furthermore, the radian of the inner reflecting surface c1 is slightly smaller than that of the inner reflecting surface c2, so that the light rays far away from the optical axis o can be gathered when exiting the light emitting surface d, and the light gathering performance of the COB lens is enhanced. In order to further enhance the light condensation performance, the light emitting surface d is slightly concave towards the direction of the optical cavity, and meanwhile, in order to avoid light spots caused by excessive light condensation, the part of the light emitting surface d, which is positioned on the optical axis o, is convex towards the direction away from the optical cavity, so that the COB lens is ensured to have a good light emitting effect.

Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the protection scope of the present application, and although the present application is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present application without departing from the spirit and scope of the technical solutions of the present application.

Claims

1. The utility model provides a COB lens, the lens top surface is equipped with the optical cavity of indent, thereby the lateral wall of lens gradually draws in towards the optical cavity and forms curved first internal reflection face, and the bottom surface of lens is for going out the plain noodles, and the light that jets into from the optical cavity lateral wall is hit after the refraction on the first internal reflection face and reflected by first internal reflection face go out plain noodles, its characterized in that:

the bottom surface of optical cavity is protruding towards optical cavity arc, is equipped with cyclic annular arch on this bottom surface, and the arch sets up and caves in the optical cavity around the optical axis of lens, and the lateral wall face of keeping away from the optical axis in the arch is curved second internal reflection face, and the arc center of second internal reflection face sets up towards the optical axis, and the lateral wall face that is close to the optical axis in the arch inclines towards the direction that is close to the optical axis so that can hit after the refraction from the light that this lateral wall face penetrated on the second internal reflection face.

2. The COB lens of claim 1, characterized in that: the side wall surface of the protrusion, which is close to the optical axis, is abutted against the side wall of the optical cavity.

3. The COB lens of claim 1 or 2, characterized in that: the optical cavity side wall is inclined in a direction away from the optical axis.

4. The COB lens of claim 1, characterized in that: the radian of the second internal reflection surface is smaller than that of the first internal reflection surface.

5. The COB lens of claim 1 or 4, wherein: the light emitting surface is concave towards the direction of the light cavity.

6. The COB lens of claim 5, wherein: the part of the light-emitting surface on the optical axis is convex towards the direction far away from the optical cavity.

7. The COB lens of claim 1, characterized in that: the bottom surface of the light cavity is a pattern-sunning surface.