CN210243880U

CN210243880U - Reflective backlight lens with tooth-shaped bottom

Info

Publication number: CN210243880U
Application number: CN201921428558.4U
Authority: CN
Inventors: Yunxia Yue; 岳韵霞
Original assignee: Chengdu Pulse Optics Tech Co ltd
Current assignee: Chengdu Pulse Optics Tech Co ltd
Priority date: 2019-08-29
Filing date: 2019-08-29
Publication date: 2020-04-03
Anticipated expiration: 2029-08-29

Abstract

The utility model discloses a reflective backlight lens with a toothed bottom, which comprises a light-emitting surface and a light-entering hole, wherein the light-emitting surface is positioned on the surface of the lens, the light-entering hole is positioned on the bottom surface of the lens, at least two groups of annular reflecting rings are arranged on the bottom surface of the lens, the at least two groups of reflecting rings and the light-entering hole are distributed concentrically, each group of reflecting cross section is triangular, one side of the triangle is positioned on the bottom surface of the lens, an included angle between two sides of the triangle close to the light-entering hole is defined as theta, and the theta angles of each group of reflecting rings are; through the reflection angle who sets up different reflection rings, this lens in a poor light can utilize the light that the light source shines the lens bottom and throw to the diffuser plate for the facula illuminance on the diffuser plate is more even, compares in traditional lens in a poor light, forms effective facula more easily.

Description

Reflective backlight lens with tooth-shaped bottom

Technical Field

The utility model belongs to the optical accessories field, concretely relates to toothed reflective lens in a poor light of bottom area.

Background

The backlight lens of the back-in type reflective television diffuses light emitted by the LED through the characteristics of the backlight lens and then irradiates the light on the diffusion plate, so that the diffusion plate presents more uniform luminance distribution; in order to reduce the cost, the number of light bars will be reduced, and then the lens is required to achieve a larger light spot and a more uniform illumination distribution in the design process, and the existing reflective backlight lens has the following defects in this respect:

for example, in the chinese patent application No. 201610025009.7 entitled "a lens and backlight module having the same", a backlight lens is disclosed, in which a reflective ring is disposed on the bottom surface of the backlight lens to reduce the influence of fresnel reflection, but the reflective ring is only used to split and diverge the light beam from the LED lamp bead to the bottom surface of the lens to reduce the fresnel reflection effect, and how to fully utilize the light source from the LED lamp bead to the bottom surface of the lens is not studied.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a: the reflecting type backlight lens with the tooth shape at the bottom can reflect and utilize light beams, so that the integral reflection quantity of the backlight lens is improved, and the illumination of irradiated light spots is more uniform.

In order to realize the purpose, the utility model discloses a technical scheme be:

the utility model provides a reflective lens in a poor light of tooth form is taken to bottom, is including the play plain noodles that is located the lens surface and the unthreaded hole that enters that is located the lens bottom surface, set up at least two sets of annular reflective rings on the lens bottom surface, at least two sets of reflective rings and the unthreaded hole of entering distribute with one heart, each group's reflective ring cross-section is triangle-shaped, and one side of triangle-shaped is located on the lens bottom surface, defines the triangle-shaped in close to the contained angle between the both sides of entering the unthreaded hole and is theta, then the theta angle value of each group's reflective ring is.

The light emitting surface comprises a first refraction surface, a second refraction surface and a total reflection curved surface, wherein the total reflection curved surface is positioned at the upper end of the lens, the first refraction surface and the second refraction surface are positioned at the side part of the lens to form a lens refraction side surface, and two ends of the lens refraction side surface are respectively connected with the total reflection curved surface and the bottom surface of the lens.

The light inlet hole comprises a first light inlet face positioned at the bottom of the light inlet hole and a second light inlet face positioned on the side wall of the light inlet hole, and the light source is arranged in the light inlet hole.

As a first scheme: the at least two groups of reflection rings are recessed on the bottom surface of the lens.

As a second scheme: the at least two groups of reflecting rings are all protruded above the bottom surface of the lens.

The third scheme is as follows: and one group of any two adjacent reflecting rings in the at least two groups of reflecting rings is sunken on the bottom surface of the lens, and the other group of the at least two groups of reflecting rings is protruded on the bottom surface of the lens.

Further, the angle θ is acute.

Furthermore, the surfaces of the at least two groups of reflecting rings are plated with reflecting layers, and the reflecting layers can also extend to the bottom surface of the whole lens.

Furthermore, column bases are respectively arranged on the periphery of the bottom surface of the lens to fix the lens.

Since the technical scheme is used, the beneficial effects of the utility model are that:

the bottom of the backlight lens of the utility model is provided with a plurality of groups of reflecting rings to reflect the light source irradiating the bottom of the lens, and the reflecting angles corresponding to each group of reflecting rings are different in size, so that the reflecting light ray divergence ranges are different; through the reflection angle who sets up different reflection rings, this lens in a poor light can utilize the light that the light source shines the lens bottom and throw to the diffuser plate for the facula illuminance on the diffuser plate is more even, compares in traditional lens in a poor light, forms effective facula more easily.

Drawings

FIG. 1 is a perspective view of a first embodiment of a lens of the present invention;

FIG. 2 is a half-sectional view of a first embodiment lens of the present invention;

FIG. 3 is a schematic diagram A of the operation of the first embodiment of the present invention;

FIG. 4 is a schematic diagram B illustrating the operation of the reflective teeth of the lens according to the first embodiment of the present invention;

FIG. 5 is a half sectional view of a second embodiment of the lens of the present invention;

the reference numerals are 1-reflection ring, 1 a-third reflection ring, 1 b-second reflection ring, 1 c-first reflection ring, 2-light-out surface, 2 a-first refraction surface, 2 b-second refraction surface, 2 c-total reflection curved surface, 3-light-in hole, 3 a-first light-in surface, 3 b-second light-in surface, 4-lens bottom surface, 4 a-column foot, e-first incident light, f-second incident light, g-third incident light, N1-first normal, N2-second normal, N3-third normal, α -first incident angle, β -second incident angle and gamma-third incident angle.

Detailed Description

The invention is further illustrated by the following figures and examples.

The first embodiment is as follows:

as shown in fig. 1-2, a reflective backlight lens with a toothed bottom includes a light exit surface 2 located on the surface of the lens and a light entrance hole 3 located on the bottom surface 4 of the lens, where the light entrance hole 3 is located at the center of the bottom surface 4 of the lens and is formed by recessing toward the inside of the lens, the light entrance hole 3 includes a first light entrance surface 3a located at the bottom of the light entrance hole and a second light entrance surface 3b located on the side wall of the light entrance hole, and the first light entrance surface 3a and the second light entrance surface 3b are connected with each other.

The light emitting surface 2 comprises a first refraction surface 2a, a second refraction surface 2b and a total reflection curved surface 2c, wherein the total reflection curved surface 2c is positioned at the upper end of the lens and is formed by sinking towards the inside of the lens, the first refraction surface 2a and the second refraction surface 2b are positioned at the side parts of the lens to form a lens refraction side surface, the upper end of the lens refraction side surface is connected with the total reflection curved surface 2c, the lower end of the lens refraction side surface is connected with a lens bottom surface 4, the light emitting surface 2 of the whole lens takes the axis of the light inlet hole 3 as the center to form a spiral body structure, the lens bottom surface 4 is of a rectangular structure and is integrally formed with the whole lens, and four vertex angles of the lens bottom surface 4 are respectively provided with a group of column feet.

Three groups of annular reflecting rings 1 are arranged on the lens bottom surface 4, the three groups of reflecting rings 1 and the light inlet hole 3 are concentrically distributed, namely the outlines of the three groups of reflecting rings 1 and the outline of the light inlet hole 3 are of concentric circle structures, the section of each group of reflecting rings 1 is triangular, and one side of each triangle is positioned on the lens bottom surface 4.

As shown in fig. 4, in the present embodiment, the three groups of reflective rings 4 are each formed by recessing the lens bottom surface 4 into the lens, and the three groups of reflective rings 1 from the center of the lens bottom surface 4 from inside to outside are respectively named as a first reflective ring 1c, a second reflective ring 1b, and a third reflective ring 1 a.

An included angle between two edge lines close to the light entrance hole 3 in the triangle in any one group of the reflection rings 1 is defined as theta, the theta angle of each group of the reflection rings 1 has different values, that is, the angle theta corresponding to the first reflection ring 1c, the angle theta' corresponding to the second reflection ring 1b and the angle theta ″ corresponding to the third reflection ring 1a have different values.

The LED is installed in the light inlet 3, the light emitted by the LED irradiates the triangular reflective ring 1, and because of the difference in the value of θ, the angles of the normal lines of the reflective surfaces of the first reflective ring 1c, the second reflective ring 1b and the third reflective ring 1a are also different, as shown in fig. 3, the normal lines of the LED irradiating the reflective surface of the first reflective ring 1c, the reflective surface of the second reflective ring 1b and the reflective surface of the third reflective ring 1a are named as N1, N2 and N3, respectively, so that a coordinate system is established by the plane where the half-section of the whole lens is located, and the angles corresponding to N1, N2 and N3 are also different.

Light rays irradiated by the LED to the reflection surface of the first reflection ring 1c, the reflection surface of the second reflection ring 1b and the reflection surface of the third reflection ring 1a are named as a first incident light ray e, a second incident light ray f and a third incident light ray g respectively, an included angle between the first incident light ray e and the normal N1 is α, an included angle between the second incident light ray f and the normal N2 is β, and an included angle between the third incident light ray g and the normal N3 is γ.

As shown in fig. 3 and 4, taking the first reflection ring 1c as an example, when the angle θ is changed by △ θ, the angle of the first incident light e emitted by the LED light source is not changed, the angle between the first incident light e projected onto the diffusion plate after penetrating through the lens and the lens axis (i.e. the axis of the light inlet 3) will be changed by 2 times △ θ, that is, a circular illumination area with a distance D from the lens axis is formed on the diffusion plate, the projection area of the light reaching the bottom surface 4 of the lens and reflected by the reflection ring 1 on the diffusion plate is adjusted by setting different values of θ, and the illumination uniformity of the whole light spot is controlled by setting the reflection rings 1 (i.e. the first reflection ring 1c, the second reflection ring 1b and the third reflection ring 1a) with different values of θ, so that compared with the conventional backlight lens, the illumination light spot formed on the diffusion plate is higher due to increase the reflection utilization of the light at the bottom of the lens, and the formed effective light spot area is larger.

In order to enhance the effective reflection intensity of the reflection surface of each group of reflection rings 1, taking the first reflection ring 1c as an example, the cross section of the first reflection ring 1c is processed into an isosceles right trapezoid, that is, the oblique side of the isosceles right trapezoid is located above the bottom surface 4 of the lens, so θ of the first reflection ring is 45 °, and the first incident light e irradiated on the first reflection ring 1c is totally reflected; in the case where θ' and θ ″ on the second reflective ring 1b and the third reflective ring 1a are smaller than 45 °, the second incident light ray f and the third incident light ray g will also be totally reflected.

Example two;

in the second embodiment, the number of the reflective rings 1 can be two or more, and as shown in fig. 5, the reflective rings 1 all protrude from the bottom surface 4 of the lens, that is, the sectional triangle of the reflective ring 1 described in the second embodiment is rotated by 180 ° around the midpoint of the edge of the triangle on the bottom surface 4 of the lens, so as to obtain the sectional triangle shape of the reflective ring in this embodiment.

Example three:

it is obvious from the first embodiment and the second embodiment that, in the present embodiment, the reflection rings 1 are at least two groups, and any two adjacent groups of reflection rings are recessed in the bottom surface 4 of the lens and protrude from the bottom surface 4 of the lens.

Example four:

in the practical use process, because many light rays emitted by the LED light source are not completely parallel, many light rays cannot be completely totally reflected in the reflection ring 1, so in order to increase the reflection amount, a reflection layer can be plated on the surface of the reflection ring 1, for example, silver plating, and in addition, the silver plating reflection layer can also extend and densely distribute to the whole lens bottom surface 4.

Claims

1. The utility model provides a toothed reflective lens in a poor light of bottom area, is including the light-emitting surface (2) that are located the lens surface and the income unthreaded hole (3) that are located lens bottom surface (4), its characterized in that: the lens is characterized in that at least two groups of annular reflecting rings (1) are arranged on the bottom surface (4) of the lens, the at least two groups of reflecting rings (1) and the light inlet hole (3) are concentrically distributed, the cross section of each group of reflecting rings (1) is triangular, one side of each triangle is positioned on the bottom surface (4) of the lens, an included angle between two side lines close to the light inlet hole (3) in the triangle is defined to be theta, and the theta angles of each group of reflecting rings (1) are different in value.

2. The bottom-toothed reflective backlight lens of claim 1, wherein: the at least two groups of reflecting rings (1) are recessed on the bottom surface (4) of the lens.

3. The bottom-toothed reflective backlight lens of claim 1, wherein: the at least two groups of reflecting rings (1) are all protruded above the bottom surface (4) of the lens.

4. The bottom-toothed reflective backlight lens of claim 1, wherein: any two adjacent groups of the at least two groups of the reflection rings (1) are recessed on the bottom surface (4) of the lens, and one group of the reflection rings is protruded on the bottom surface (4) of the lens.

5. The bottom-toothed reflective backlight lens of claim 1, wherein: the theta angle degree is 0-45 degrees.

6. The bottom-toothed reflective backlight lens of claim 1, wherein: the surfaces of the at least two groups of reflecting rings (1) are plated with reflecting layers.

7. The bottom-toothed reflective backlight lens of claim 6, wherein: the light-reflecting layer extends over the entire bottom surface (4) of the lens.

8. The bottom-toothed reflective backlight lens of claim 1, wherein: the light emitting surface (2) comprises a first refraction surface (2a), a second refraction surface (2b) and a total reflection curved surface (2c), wherein the total reflection curved surface (2c) is positioned at the upper end of the lens, the first refraction surface (2a) and the second refraction surface (2b) are positioned on the side part of the lens to form a lens refraction side surface, and two ends of the lens refraction side surface are respectively connected with the total reflection curved surface (2c) and the lens bottom surface (4).

9. The bottom-toothed reflective backlight lens of claim 1, wherein: the light inlet hole (3) comprises a first light inlet surface (3a) positioned at the bottom of the light inlet hole and a second light inlet surface (3b) positioned on the side wall of the light inlet hole.

10. The bottom-toothed reflective backlight lens of claim 1, wherein: and column feet (4a) are respectively arranged on the periphery of the bottom surface (4) of the lens to fix the lens.