CN104344332A

CN104344332A - Lens module and light source module comprising lens module

Info

Publication number: CN104344332A
Application number: CN201310321846.0A
Authority: CN
Inventors: 王何立颖
Original assignee: Hongfujin Precision Industry Shenzhen Co Ltd; Hon Hai Precision Industry Co Ltd
Current assignee: Hongfujin Precision Industry Shenzhen Co Ltd; Hon Hai Precision Industry Co Ltd
Priority date: 2013-07-29
Filing date: 2013-07-29
Publication date: 2015-02-11

Abstract

The invention provides a lens module for adjusting light emitted by a light source. The lens module comprises a first lens and a second lens. A receiving groove is formed in the second lens; the first lens is received in the receiving groove and fitted with the surface of the receiving groove. The refractive index of the second lens is smaller than that of the first lens. The light emitted by the light source orderly passes through the first lens and the second lens and is emergent to the outside. The invention also provides a light source module comprising the lens module.

Description

Lens module and apply the light source module of this lens module

Technical field

The present invention relates to a kind of lens module and apply the light source module of this lens module.

Background technology

Compared to traditional light emitting source, light emitting diode (Light Emitting Diode, LED) has the advantages such as lightweight, volume is little, it is low to pollute, the life-span is long, and it is as a kind of novel light emitting source, is applied more and more widely.Such as, the light source of the backlight module of existing display is replaced by light emitting diode gradually.

Existing display backlight module adopts straight-down negative usually, and down straight aphototropism mode set is in order to reduce the use of light emitting diode, and can increase by an expansion optical element again in side on a light emitting diode, the angle of divergence of light emitting diode can expand by this expansion optical element.But traditional expansion optical element normally adopts single lens, because the difference between the refractive index of lens and air is comparatively large, so easily cause the phenomenon of total reflection in the place on the border of lens, the light extraction efficiency of light source module can be reduced thus.

Summary of the invention

In view of this, be necessary to provide a kind of rising angle large and the lens module that light extraction efficiency is high and apply the light source module of this lens module.

A kind of lens module, it adjusts for the light sent light source.Described lens module comprises the first lens and the second lens.Described second lens form an accepting groove, and described first lens are contained in this accepting groove, and fit with the surface of this accepting groove.The refractive index of described second lens is less than the refractive index of described first lens.The light that light source sends shines outside through the first lens and the second lens successively.

A kind of light source module, it comprises light source and above-mentioned lens.

Above-mentioned lens module adopts the lens that two kinds of refractive indexes are different, relative to traditional single lens structure, the present invention arranges the second lower lens of a refractive index at the first its outer that refractive index is higher, entirely launches odds, thus improve light extraction efficiency therefore, it is possible to greatly reduce.In addition, the refractive index due to the second lens is less than the refractive index of the first lens, and light further towards the lateral deflection of lens module, thus can increase rising angle further.

Accompanying drawing explanation

Fig. 1 is the perspective view of the light source module in embodiment of the present invention.

Fig. 2 is the sectional view of the light source module in Fig. 1 along II-II direction.

Fig. 3 is the decomposition texture schematic diagram of the lens module of light source module in Fig. 1.

Fig. 4 is the decomposition texture schematic diagram of another angle of lens module in Fig. 3.

Fig. 5 is the sectional view of the first lens along V-V direction of lens module in Fig. 3.

Fig. 6 is the sectional view of the second lens along VI-VI direction of lens module in Fig. 3.

Main element symbol description

Light source module	10
		Lens module	100
Light source	200
		First lens	110
Second lens	120
		First incidence surface	111
First exiting surface	112
		Bottom surface	113、123
Side	114、124
		Second incidence surface	121
Second exiting surface	122
		Accepting groove	125
Concave surface	1121
		Convex surface	1122

Following detailed description of the invention will further illustrate the present invention in conjunction with above-mentioned accompanying drawing.

Detailed description of the invention

Below in conjunction with accompanying drawing, the present invention is described in further detail.

Refer to Fig. 1 and Fig. 2, a kind of light source module 10 that embodiment of the present invention provides comprises lens module 100 and is arranged at the light source 200 in this lens module 100.

Please then consult Fig. 3 to Fig. 6, described lens module 100 entirety is in a cylinder, and it comprises the first lens 110 and the second lens 120.Described first lens 110 are arranged in described second lens 120.

Described first lens 110 comprise the first incidence surface 111, first exiting surface 112, bottom surface 113 and side 114.Bottom surface 113 is a circular flat.First incidence surface 111 is a curved surface, and it is formed to the first lens 110 inner recess from the center of bottom surface 113.The axis of the first incidence surface 111 overlaps with the axis of lens module 100.In the present embodiment, the profile of the first incidence surface 111 is roughly an ellipsoid, and its minor axis is positioned in the plane at place, bottom surface 113, and major axis is vertical with bottom surface 113.

Described first exiting surface 112 correspondence is positioned at the top of the first incidence surface 111.This first exiting surface 112 is aspheric surface, and it comprises the concave surface 1121 being positioned at center of top and the convex surface 1122 being positioned at concave surface 1121 periphery.Described concave surface 1121 just to the first incidence surface 111, and is recessed to form towards the first incidence surface 111 direction, for dispersing the forward light arriving this concave surface 1121.Described convex surface 1122 is towards away from the outwardly curved surface in direction, bottom surface 113, and this convex surface 1122 is in smoothing junction with concave surface 1121.

The edge-perpendicular of described side 114 from bottom surface 113 upwards extends and is connected to the edge of the first exiting surface 112.This side 114 is cylindric, and its center of circle is positioned on the optical axis of lens module 100.

Described second lens 120 comprise the second incidence surface 121, second exiting surface 122, bottom surface 123 and side 124.Described bottom surface 123 is a circular flat.Described second lens 120 cave inward formation one accepting groove 125 in the middle part of bottom surface 123, and the surface of this accepting groove 125 forms described second incidence surface 121.The shape of the second incidence surface 121 is identical with the first exiting surface 112 of the first lens 110 and side 114, when being contained in accepting groove 125 to make described first lens 110, the first exiting surface 112 of the first lens 110 and side 114 can be fitted on the second incidence surface 121 of the second lens 120 completely.Second exiting surface 122 is a circular flat parallel with bottom surface 123, and it is centrally located on the optical axis of lens module 100.The edge-perpendicular of side 124 from bottom surface 123 upwards extends and is connected to the edge of the second exiting surface 122.This side 124 is cylindric, and its center of circle is positioned on the optical axis of lens module 100.

Described first lens 110 are contained in the accepting groove 125 of described second lens 120, first exiting surface 112 of the first lens 110 and the second incidence surface 121 of side 114 and the second lens 120 are fitted completely, and, the bottom surface 113 of the first lens 110 and the bottom surface 123 of the second lens 120 in the same plane, thus make the lens module 100 after combination form a cylindrical shape.

First lens 110 and the second lens 120 adopt different materials to make respectively, and wherein the refractive index of the material of the first lens 110 is greater than the refractive index of the material of the second lens 120.In the present embodiment, the refractive index of the first lens 110 is 1.8, and it adopts optical grade glass material to form, and the refractive index of the second lens 120 is 1.5, and it adopts polymethyl methacrylate (polymethylmethacrylate, PMMA) to form.

In the space that the first incidence surface 111 that described light source 200 is arranged at the first lens 110 surrounds.In the present embodiment, described light source 200 is light emitting diode.

Please then consult Fig. 2, described light source module 10 in use, first the light that light source 200 sends enter into the first lens 110 by the first incidence surface 111 of the first lens 110, the forward light that wherein light source 200 sends penetrates through the second lens 120 after being dispersed towards both sides by the concave surface 1121 of the first lens 110; The side direction light that light source 200 sends is when entering the second lens 120 from the first lens 110, refractive index due to the first lens 110 is greater than the refractive index of the second lens 120, so full generation of launching can be avoided at the periphery of the first lens 110, thus improve the light extraction efficiency of light source module 10, in addition, refractive index due to the first lens 110 is greater than the refractive index of the second lens 120, light further towards the lateral deflection of lens module 100, thus can increase the rising angle of light source module 10 further.

Be understandable that, for the person of ordinary skill of the art, the change and distortion that other various picture answers can be made by technical conceive according to the present invention, and all these change the protection domain that all should belong to the claims in the present invention with distortion.

Claims

1. a lens module, it adjusts for the light sent light source, it is characterized in that: described lens module comprises the first lens and the second lens, described second lens form an accepting groove, described first lens are contained in this accepting groove, and fit with the surface of this accepting groove, the refractive index of described second lens is less than the refractive index of described first lens, and the light that light source sends shines outside through the first lens and the second lens successively.

2. lens module as claimed in claim 1, it is characterized in that: described first lens comprise the first incidence surface, the first exiting surface, bottom surface and side, described first incidence surface is a curved surface caved in the first lens interior from the center of bottom surface, described first exiting surface is positioned at the top of described first incidence surface, connection bottom surface, described side and the first exiting surface.

3. lens module as claimed in claim 2, it is characterized in that: the first exiting surface of described first lens comprises the concave surface being positioned at center of top and the convex surface being positioned at concave surface periphery, described concave surface facing described first incidence surface direction depression, described convex surface court is away from described first incidence surface direction evagination.

4. lens module as claimed in claim 2, is characterized in that: the first exiting surface of described first lens and the shape of side identical with the shape of the accepting groove of described second lens, fit in the surface of the first exiting surface of the first lens and side and accepting groove.

5. lens module as claimed in claim 4, it is characterized in that: described second lens comprise the second incidence surface, the second exiting surface, bottom surface and side, described bottom surface is a plane, described accepting groove caves inward formation in the middle part of this bottom surface, described accepting groove surface forms described second incidence surface, described second exiting surface is a plane parallel with bottom surface, connection bottom surface, described side and the second exiting surface, the bottom surface of described second lens and the bottom surface of described first lens in the same plane.

6. lens module as claimed in claim 1, is characterized in that: described first lens adopt optical grade glass material to make, and described second lens adopt polymethyl methacrylate materials to make.

7. a light source module, it comprises light source and the lens as described in claim 1-6 any one.

8. light source module as claimed in claim 7, it is characterized in that: described light source is light emitting diode, this light emitting diode is arranged in described first lens.