CN108087841B

CN108087841B - Light guide hollow lens and LED lamp bead

Info

Publication number: CN108087841B
Application number: CN201810151673.5A
Authority: CN
Inventors: 李鹤荣
Original assignee: Individual
Current assignee: Individual
Priority date: 2018-02-14
Filing date: 2018-02-14
Publication date: 2020-11-24
Anticipated expiration: 2038-02-14
Also published as: CN108087841A

Abstract

A light guide hollow lens and an LED lamp bead, wherein the light guide hollow lens comprises a lens main body, an incident surface and an emergent surface, the incident surface and the emergent surface are respectively positioned on the inner side and the outer side of the lens main body, the lens main body is a revolving body, the incident surface is a paraboloid of revolution with a downward opening, the emergent surface is a spherical surface of revolution, and the revolving body, the paraboloid of revolution and the spherical surface of revolution have the same revolving axis; the lens main body positioned right above the incident surface is also provided with a reflecting surface which is a rotary conical surface with an upward opening, and the rotary conical surface and the paraboloid of revolution have the same rotary shaft; the LED lamp bead comprises an LED light source and the light guide hollow lens with the structure, and the LED light source is positioned on the focus of the incident surface in the light guide hollow lens. The invention enables the light beam emitted by the light source to have a larger light-emitting angle, and enables the lamp to form a larger lighting aperture; the LED lamp can perform refraction, deflection, reflection and scattering functions on light beams of a light source, and the visual lighting effect of the LED lamp is remarkably improved.

Description

Light guide hollow lens and LED lamp bead

Technical Field

The invention relates to the field of illumination, in particular to a light guide hollow lens and an LED lamp bead.

Background

In recent years, along with the increasingly prominent pollution and energy problems, the LED lamp with more energy conservation and environmental protection is popularized and applied on a large scale; the LED lamp generally comprises a light emitting diode and a lampshade above the light emitting diode, light rays emitted from the light emitting diode at present cannot well meet the illumination requirement, and the light output shape of the light emitting diode is adjusted by adopting a mode of additionally arranging a lens on the light emitting diode.

In practical application, in order to improve the illumination visual effect, a lens with a light ray adjusting effect is required to be installed outside an LED light source, the current commonly used lens is generally an astigmatic lens, the typical structure of the lens is a plug-in LED lamp bead lens and a lens group disclosed in Chinese patent ZL201710327387.5, a single lens (2) is described, the single lens is a hollow semi-elliptical solid, the outer part of the single lens is a lens emergent surface (7) formed by a smooth spline surface, and the inner part of the single lens is a lens incident surface (9) formed by a smooth hemispherical curved surface; the technical scheme that a lamp bead accommodating cavity (8)' is arranged inside a single lens (2), the light path diagram of the technical scheme is shown in fig. 5 and fig. 6 recorded in the publication text, the light path diagram of the technical scheme adjusts point-shaped light beams from a light emitting diode into divergent light beams through the lens, however, the LED lamp adjusted through the lens has small light beam deflection, concentrated brightness and poor visual effect, and particularly, illumination is excessively concentrated below the lamp, so that the illumination effect is poor; therefore, the deflection of the lens to the light beam is improved, the LED has a larger illumination aperture, and the LED lamp has important significance for improving the visual illumination effect of the LED lamp.

Disclosure of Invention

The invention aims to provide a light guide hollow lens and an LED lamp bead, which have the advantages of compact structure, uniform illumination and good light beam diffusion.

The invention is realized in such a way that a light guide hollow lens comprises a lens main body, and an incident surface and an emergent surface which are respectively positioned on the inner side and the outer side of the lens main body.

The lens body positioned right above the incident surface is also provided with a reflecting surface which is a rotary conical surface with an upward opening, and the rotary conical surface and the paraboloid of revolution have the same rotary shaft.

The connection surface between the emergent surface and the top of the reflecting surface is a scattering surface.

Optionally, the lens body is made of silicone, glass or a transparent PC material.

The invention also discloses an LED lamp bead which comprises an LED light source and is characterized by also comprising the light guide hollow lens with the structure, wherein the LED light source is positioned on the focus of the incident surface in the light guide hollow lens.

The LED light source and the light guide hollow lens are fixed together and cannot be detached.

The LED light source comprises a light emitting diode and a driving circuit board, and a protective cover clamped and matched with the driving circuit board is further arranged above the light emitting diode.

The lower surface of the driving circuit board is also connected with a fixed patch, and a sealing rubber ring is connected between the fixed patch and the outer edge of the lens main body.

Optionally, the lower part of the protective cover is provided with a retaining ring, and the driving circuit board is provided with a positioning groove matched with the retaining ring.

The invention has the beneficial effects that: the invention is a special-shaped hollow lens with a regular structure, on one hand, the appearance structure of the light guide hollow lens can be utilized to play a good protection role on a light source function part, on the other hand, the light beam of the light source is deflected by the hollow lens, the light beam emitted by the LED light source has a larger light-emitting angle, and a lamp forms a larger lighting aperture; through the structural optimization design of the hollow lens, the light source can perform refraction deflection, reflection and scattering functions on light beams of the light source, the light rays are concentrated to a larger deflection angle, the light ring with a larger angle improves the illumination uniformity and consistency of the lamp, and the visual illumination effect of the LED lamp is remarkably improved.

Drawings

FIG. 1 is a perspective view of an embodiment of a light-directing hollow lens of the present invention.

Fig. 2 is a schematic diagram of the optical path of the embodiment shown in fig. 1.

FIG. 3 is a perspective view of the structure of the LED lamp bead of the present invention.

Fig. 4 is a cross-sectional view of the structure at a-a in fig. 3.

Fig. 5 is an assembly view of the structure of the embodiment shown in fig. 3.

Fig. 6 is an exploded view of the structure of the embodiment shown in fig. 3.

Fig. 7 is a schematic view of a connection structure of the driving circuit board and the fixing patch according to the present invention.

FIG. 8 is a schematic view of the distribution of the light beams emitted from the LED lamp beads through the hollow lens.

Fig. 9 is a schematic view of illumination distribution of the LED lamp beads in the embodiment shown in fig. 8.

Fig. 10 is a sectional view of another embodiment of the LED lamp bead of the present invention.

Detailed Description

It will be appreciated by those skilled in the art that while the following description refers to numerous technical details of embodiments of the present invention, this is by way of example only, and not by way of limitation, to illustrate the principles of the invention. The present invention can be applied to places other than the technical details exemplified below as long as they do not depart from the principle and spirit of the present invention.

In addition, in order to avoid limiting the description of the present specification to a great extent, in the description of the present specification, it is possible to omit, simplify, and modify some technical details that may be obtained in the prior art, as would be understood by those skilled in the art, and this does not affect the sufficiency of disclosure of the present specification.

The following further describes embodiments of the present invention with reference to the drawings.

As shown in fig. 1 and 2, the present invention is implemented by the light guide hollow lens comprising a lens body 1 (it can be understood that the light guide hollow lens and the lens body 1 are referred to interchangeably) having an incident surface 101 and an exit surface 102 respectively located inside and outside the lens body 1, and is structurally characterized in that the lens body 1 is a revolving body, the incident surface 101 is a paraboloid of revolution with a downward opening, the exit surface 102 is an outer arc surface of revolution (for example, a spherical surface of revolution), and the revolving body, the paraboloid of revolution and the outer arc surface of revolution have the same revolving axis; the invention is a special-shaped hollow lens with regular structure, on one hand, the appearance structure of the light guide hollow lens can be utilized to play a good protection role on a light source function part, on the other hand, the light beam of the light source is as shown in part in figure 2, the light beam firstly enters the lens main body 1 through the incident surface 101, then is emitted from the emergent surface 102, and is refracted through the lens main body 1, when the light beam is emitted to a light thinning medium from a light tight medium, the refraction angle is larger than the incident angle, so that the emitted light beam from the light source can be refracted and deflected, and the light beam emitted from the emergent surface 102 has a larger light emitting angle relative to the light beam emitted by the traditional light source, and a larger illumination aperture; meanwhile, according to the optical principle, when the incident angle of the light in the lens body 1 exceeds the critical angle, total reflection occurs, and part of the light returns to the space between the paraboloids of revolution through the incident surface 101, and enters the lens body 1 again through the incident surface 101 together with the light emitted from the light source after being reflected, until the light exits through the exit surface 102, as shown in fig. 8. In specific implementation, in order to improve the illumination intensity of the aperture at the exit surface 102, the lens body 1 directly above the entrance surface 101 is further provided with a reflecting surface 103, the reflecting surface 103 is a conical surface of revolution with an upward opening, and the conical surface of revolution has the same revolution axis as the paraboloid of revolution; the included angle of the conical surface of the revolution is set according to different critical angles, so that the incident angles of the light rays irradiating the reflecting surface 103 are all larger than the critical angle, the light rays approaching the revolution shaft and irradiating the reflecting surface 103 are totally reflected, as shown in fig. 2, the reflected light rays are finally emitted from the emergent surface 102 after being deflected for multiple times, and thus the light rays emitted from the light source are concentrated to the aperture where the emergent surface 102 is located, the illumination intensity is improved, and the actual illumination requirement is met.

Of course, in order to better improve the visual effect of the illumination, the connecting surface between the emergent surface 102 and the top of the reflecting surface 103 is a scattering surface 104, the longitudinal section of the scattering surface 104 is an inverted isosceles trapezoid structure, and the light refracted by the scattering surface 104 is a sparse divergent light beam, so that a visible continuous transition light beam can be emitted from the emergent surface 102 to the reflecting surface 103, and the uniformity of the illumination is maintained, as shown in fig. 9; meanwhile, in order to improve the scattering effect, the scattering surface 104 may be a frosted surface.

In specific implementation, the lens body 1 may be made of various transparent materials such as silica gel, glass, transparent PC, and the like; the incident surface 101, the exit surface 102, the reflection surface 103 and the scattering surface 104 are designed reasonably according to different refraction and reflection of different materials to light, taking silica gel as an example, the refractive index is about 1.4-1.5, the critical angle can be calculated to be about 40 degrees, when the angle between the incident light and the normal is larger than the angle, total reflection occurs, and the taper of the reflection surface 103 is calculated to be smaller than 100 degrees (preferably smaller than 80 degrees) according to geometric characteristics, so that the light in the middle direction is totally reflected. The incident plane 101, the exit plane 102 and the scattering plane 104 are designed according to the specification and the aperture size of the lens, as shown in fig. 8, as long as the requirement of beam deflection refraction is satisfied, in the actual design, the light-emitting angle of 150 and 180 degrees can be realized due to the refraction of the lens to the beam, and the illumination with large angle and large aperture can be realized.

Alternatively, the incident surface 101 may be formed to have a curvature corresponding to the light emitting surface of the LED light source 2 so that the light is incident on the incident surface 101 without being refracted to change the direction.

Alternatively, the exit surface 101 may be a spline surface of revolution other than a spherical surface of revolution, or any other suitable curved surface. As shown in fig. 3-9, the invention also discloses an LED lamp bead, which comprises an LED light source 2, and is structurally characterized in that the LED lamp bead further comprises a light guide hollow lens with the above structure, wherein the LED light source 2 is positioned at the focus of an incident surface 101 in the light guide hollow lens; the LED light source 2 and the light-conducting hollow lens 1 are fixed together, for example by gluing, in a non-detachable manner.

In specific implementation, the LED light source 2 includes a light emitting diode 201 and a driving circuit board 202, a protective cover 203 is further disposed above the light emitting diode 201 and is in snap fit with the driving circuit board 202, the light emitting diode 201 is located at a focal position of the incident surface 101, one surface of the driving circuit board 202, which is close to the light emitting diode 201, is a reflective layer, so that light emitted from the light emitting diode 20 enters the light guiding hollow lens, most of the light is emitted through the exit surface 102 and the scattering surface 104 of the light guiding hollow lens, and a part of the light passes through the reflective surface 103 and then returns to a space between the incident surface 10 and the light source, and is reflected again and then enters the light guiding hollow lens again, as shown in fig. 8, until the light is emitted from the exit surface 102 and the scattering surface 104, thereby increasing the.

Certainly, in order to improve the reliability of assembly, simplify the structure, improve the flattening of the lamp bead, and optimize the detailed structure, in the specific implementation, the lower surface of the driving circuit board 202 is further connected with a fixed patch 3, and a sealing rubber ring 4 is connected between the fixed patch 3 and the outer edge of the lens main body 1; the assembling process is as shown in fig. 5-7, firstly, the LED light source 2 is attached to the fixed patch 3 through the driving circuit board 202, then the light guide hollow lens is connected to the LED light source 2 according to the structure, and finally, a circle of sealing rubber ring 4 is attached to the fixed patch 3 and the outer edge of the lens main body 1; in order to reduce the thickness of the lamp bead, a locking ring 2031 is disposed at the lower portion of the protective cover 203, and a positioning groove 2021 matched with the locking ring 2031 is disposed on the driving circuit board 202.

Of course, the implementation structure of the present invention is not limited to the above structure, and in the specific implementation, a structure as shown in fig. 10 may be adopted, in which on one hand, the structure is simplified, the scattering surface 104 is omitted, and the exit surface 102 adopts an arc surface with a larger central angle.

On the other hand, the protective cover 203 can be omitted, the wafer of the light emitting diode 201 is combined with the fluorescent powder glue to form an upward convex shape, the upward convex shape is surrounded by the support, the step shape is formed integrally with the support, the lower bottom surface of the lens main body 1 forms a step structure matched with the lower bottom surface, when the lens main body is assembled, the wafer is combined with the fluorescent powder glue to extend upwards into the space where the incident surface 101 is located and to be in contact with the incident surface 101 for positioning, so that the LED light source 2 keeps better structural stability, and the problems of poor strength of a direct bonding structure and increase of the whole thickness of a product are.

Specifically, the lower position of the incident surface 101 and the lower bottom surface of the lens body 1 may be in an inverse step shape (form a revolution surface) for embedding the LED light source 2 upward (the wafer is combined with the phosphor glue, and the LED light source 2 may be in any shape such as a flat and convex cylinder or a cube shape, or a hemisphere shape), which is more beneficial to positioning the LED light source 2, and reduces the overall thickness of the product, and the adhesive is not easy to leak to the light emitting part of the LED light source 2 during the processing.

Accordingly, the driving circuit board (bracket) 202 itself may have any applicable shape such as a solid flat plate, a hollow plate, a plate with a concave middle, a plate with a convex middle, etc., and the combination with the LED light source 2 may also be any applicable way.

Finally, those skilled in the art will appreciate that various modifications, adaptations, and alternatives to the above-described embodiments of the present invention may be made without departing from the scope of the invention as defined by the appended claims.

Claims

1. A light-guiding hollow lens (1) having an entrance face (101) and an exit face (102) on its inner and outer side faces, respectively,

the light guide hollow lens (1) is a revolving body, the incident surface (101) is a revolving paraboloid with a downward opening, the emergent surface (102) is a revolving convex arc surface, and the revolving body, the revolving paraboloid and the revolving convex arc surface have the same revolving shaft;

the central part of the outer side surface of the light guide hollow lens (1) is also provided with a reflecting surface (103);

a scattering surface (104) serving as a connecting surface is arranged between the emergent surface (102) and the top of the reflecting surface (103);

the reflecting surface (103) is a conical surface of revolution with an upward opening, the conical surface of revolution and the paraboloid of revolution have the same revolution axis, and the included angle of the conical surface of revolution is set to make the incident angles of the light rays emitted to the reflecting surface (103) all larger than a critical angle;

the longitudinal section of the scattering surface (104) is of an inverted isosceles trapezoid structure, and the scattering surface (104) adopts a frosted surface;

the bottom of the light guide hollow lens (1) is in an inverted step shape and is used for being upwards embedded into the LED light source (2); the incident surface (101) is consistent with the curvature of the light emitting surface of the LED light source (2).

2. A light-guiding hollow lens as claimed in claim 1, characterized in that the light-guiding hollow lens (1) is made of silicone, glass or a transparent PC material.

3. An LED lamp bead, comprising an LED light source (2), characterized in that it further comprises a light guiding hollow lens (1) according to claim 1 or 2, said LED light source (2) being located at the focus of the entrance face (101) of the light guiding hollow lens (1).

4. The LED lamp bead according to claim 3, wherein the LED light source (2) comprises a light emitting diode (201) and a driving circuit board (202), and the LED light source (2) and the light guide hollow lens (1) are fixed together and are not detachable; one surface of the driving circuit board 202 close to the light emitting diode 201 is a reflective layer.

5. The LED lamp bead according to claim 4, wherein the lower surface of the driving circuit board (202) is further connected with a fixing patch (3), and a sealing rubber ring (4) is connected between the fixing patch (3) and the outer edge of the light guide hollow lens (1).

6. The LED lamp bead according to claim 4 or 5, wherein a protective cover (203) which is in clamping fit with the driving circuit board (202) is further arranged above the LED (201), a clamping ring (2031) is arranged at the lower part of the protective cover (203), and a positioning groove (2021) which is matched with the clamping ring (2031) is arranged on the driving circuit board (202).

7. The LED lamp bead according to claim 3, wherein the LED light source (2) extends upwardly into the inner hollow portion of the lens (1) body.