Lens and light emitting device having the same

This application claims priority to Chinese Patent Application No. 201410444971.5 filed on Sep. 3, 2014, the contents of which are incorporated by reference herein.

The subject matter herein generally relates to a lens, especially relates to a light emitting device having the lens.

Traditional light emitting device includes a substrate, a light source mounted on the substrate and a reflective cup mounted on the substrate and around the light source. Light emitted from the light source is reflected by the reflective cup to exit. However, the reflective cup reflects the light source is limited in a scope, the light reflected by the reflective cup is not gathered enough.

Implementations of the present technology will now be described, by way of example only, with reference to the attached figures.

FIG. 1 is an isometric view of a lens of a first embodiment of the present disclosure.

FIG. 2 is a diagrammatic view of a light emitting device having the lens of a first embodiment, and the lens is broken taken along II-II line of FIG. 1 .

FIG. 3 is a diagrammatic diagram of the light field of the light emitting device of the first embodiment of the present disclosure.

FIG. 4 is an isometric view of a lens of a second embodiment of the present disclosure.

FIG. 5 is a diagrammatic view of a light emitting device having the lens of a second embodiment, and the lens is broken taken along V-V line of FIG. 4 .

FIG. 6 is a diagrammatic view of a light emitting device having a lens of a third embodiment of the present disclosure.

FIG. 7 is a diagrammatic view of a light emitting device having a lens of a fourth embodiment of the present disclosure.

FIG. 8 is a diagrammatic view of a light emitting device having a lens of a fifth embodiment of the present disclosure.

FIG. 9 is a diagrammatic view of a light emitting device having a lens of a sixth embodiment of the present disclosure.

It will be appreciated that for simplicity and clarity of illustration, numerous specific details are set forth in order to provide a thorough understanding of the embodiments described herein. However, it will be understood by those of ordinary skill in the art that the embodiments described herein can be practiced without these specific details. In other instances, methods, procedures and components have not been described in detail so as not to obscure the related relevant feature being described. Also, the description is not to be considered as limiting the scope of the embodiments described herein. The drawings are not necessarily to scale and the proportions of certain parts have been exaggerated to better illustrate details and features of the present disclosure. The description is not to be considered as limiting the scope of the embodiments described herein.

Several definitions that apply throughout this disclosure will now be presented. The term “comprising” means “including, but not necessarily limited to”; it specifically indicates open-ended inclusion or membership in a so-described combination, group, series and the like.

As illustrate in FIG. 1 , a lens 100 of a first embodiment of the present disclosure includes a substrate 10 and a light concentrating portion 20 mounted on a side of the substrate 10 . The light concentrating portion 20 includes a first light concentrating portion 21 and a second light concentrating portion 22 .

Also referring to FIG. 2 , the first light concentrating portion 21 has a first axis L 1 , and the second light concentrating portion 22 has a second axis L 2 . The first axis L 1 and the second axis L 2 are configured in an angle and intersect in an extending direction thereof.

The lens 100 is made of material with high light transmission, such as polymethl methacrylate, Polycarbonate, etc. In this embodiment, the substrate 10 and the light concentrating portion 20 are made of one single piece.

The substrate 10 is a rectangular plate and includes a first side 101 and a second side 102 located opposite to the first side 101 . The first side 101 and the second side 102 are smooth side.

The first concentrating portion 21 extends outwardly from the second side 102 of the substrate 10 . The first concentrating portion 21 includes a first curved surface 211 and a second curved surface 212 located at opposite sides of the first axis L 1 . In this embodiment, the first curved surface 211 is located at a left side of the first axis L 1 , and the second curved surface 212 is located at a right side of the first axis L 1 . The curvature of the first curved surface 211 is different from that of the second curved surface 212 . The curvature of the first curved surface 211 is more than that of the second curved surface 212 . The firs axis L 1 of the first concentrating portion 21 and an imaginary line O 1 -O 1 ′ perpendicularly to the first side 101 of the substrate 10 define a angle α 1 . The angle α 1 is smaller than 90°.

The second concentrating portion 22 is located at a side of the first concentrating portion 21 and extends outwardly from the second side 102 of the substrate 10 . In this embodiment, the second concentrating portion 22 is on the right of the first concentrating portion 21 , and the second concentrating portion 22 and the first concentrating portion 21 are extended towards the same direction. The second concentrating portion 22 includes a first curved surface 221 and a second curved surface 222 located at opposite sides of the second axis L 2 . In illustrated embodiment, the first curved surface 221 is located at a right of the second axis L 2 , the second curved surface 222 is located at a left of the second axis L 2 . Specifically, the second curved surface 222 of the second concentrating portion 22 and the second curved surface 212 of the first concentrating portion 21 are located between the first curved surface 221 of the second concentrating portion 22 and the first curved surface 211 of the first concentrating surface 21 . The curvature of the first curved surface 221 of the second concentrating portion 22 is more than that of the second curved surface 222 of the second concentrating portion 22 . The second axis L 2 and a imaginary line O 2 -O 2 ′ perpendicularly to the second side 102 of the substrate 10 define an angle α 2 . The angle α 2 is similar than 90°.

In the illustrated embodiment, light along the first axis L 1 and light along the second axis L 2 is through the lens 100 and gathers to form a light spot C above the first side 101 of the substrate 10 .

As illustrated in FIG. 2 , a light emitting device 200 includes the lens 100 and a light source 30 below the lens 100 .

The light source 30 includes a first light source 31 and second light source 32 spaced from the first light source 31 . The first light source 31 is located at the first axis L 1 and corresponding with the first light concentrating portion 21 . The second light source 32 is located at the second axis L 2 and corresponding with the second light concentrating portion 22 . Specifically, in the illustrated embodiment, the luminescence center of the first light source 31 is located at the first axis L 1 , the luminescence center of the second light source 32 is located at the second axis L 2 .

In the illustrated embodiment, the first light source 31 and the second light source 32 are light emitting diodes. The light emitted from the first light source 31 and the light emitted from the second light source 32 respectively enters the lens 100 along the first axis L 1 of the first light concentrating portion 21 and the second axis L 2 of the second light concentrating portion 22 to gather at the light spot C. The light spot C has a highest light intensity.

In the light emitting device 200 , light emitted from the first light source 31 and along the first axis L 1 , and the imaginary line O 1 -O 1 ′ defines the angle α 1 . Light emitted from the second light source 32 and along the second axis L 2 , and the imaginary line O 2 -O 2 ′ define the angle α 2 . A vertical distance between the luminescence center of the first light source 31 and the first side 101 of the substrate 10 is D 1 . A vertical distance defined between the luminescence center of the second light source 32 and the first side 101 of the substrate 10 is D 2 . A line L 0 is defined through the center light spot C and perpendicularly to the first side 101 of the substrate 10 . A vertical distance between the luminescence center of the first light source 31 and the line L 0 is A 1 . A vertical distance between the luminescence center of the second light source 32 and the line L 0 is A 2 . A vertical distance between the center of the light spot C and the first side 101 of the substrate 10 is L. The reflective index of the lens 100 is N. So light emitted from the first light source 31 along the first axis L 1 and light emitted from the second light source 32 along the second axis L 2 satisfies the following relations:

D 1*Tan(α1)+ L *Tan(Sin−1( N *Sin(α1)))= A 1  (1)

D 2*Tan(α2)+ L *Tan(Sin−1( N *Sin(α2)))= A 2  (2)

The equation (1), (2) describes the light emitted from the first light source 31 along the first axis L 1 and the light emitted from the second light source along the second axis L 2 to enter the lens 100 .

The light emitted from the first light source 31 around the first axis L 1 and the light emitted from the second light source 32 around the second axis L 2 is described to be introduced a parameter δ. So the above equation (1), (2) are newly described as following:

D 1*Tan(α1)+ L *Tan(Sin−1( N *Sin(α1)))= A 1+δ1  (3)

D 2*Tan(α2)+ L *Tan(Sin−1( N *Sin(α2)))= A 2+δ2  (4)

As illustrated in FIG. 3 , the parameter δ 1 is a half of the highest light intensity Imax of the first light source 31 . The parameter δ 2 is a half of the highest light intensity Imax of the second light source 32 . If the first light source 31 is the same as the second light source 32 , the δ 1 is equal to the δ 2 .

In this embodiment, the light emitted from the first light source 31 and the light emitted from the second light source 32 respectively enters along the first axis L 1 of the first light concentrating portion 21 and the second axis L 2 of the second light concentrating portion 22 to gather to form the light spot C. So the light spot C has a highest light intensity.

As illustrated in FIG. 4 , a lens 100 a of a second embodiment is illustrated. The light concentrating portion 20 further includes a third light concentrating portion 23 located between the first light concentrating portion 21 and the second light concentrating portion 22 .

As illustrated in FIG. 5 , the third light concentrating portion 23 has a third axis L 3 . A vertical distance between the top end of the first light concentrating portion 21 and the second side 102 of the substrate 10 is H 1 . A vertical distance between the second light concentrating portion 22 and the second side 102 of the substrate 10 is H 2 . A vertical distance between the top end of the third light concentrating portion 23 and the second side 102 of the substrate 10 is H 3 . The H 3 is respectively less than the H 1 and H 2 .

The third light concentrating portion 23 includes a first curved surface 231 and a second curved surface 232 respectively located at both side of the third axis L 3 . The first curved surface 231 and the second curved surface 232 is symmetry about the third axis L 3 .

A light emitting device 200 a having the lens 100 a of a second embodiment further includes third light source 33 . The third light source 33 located below the second side 102 of the substrate 10 and at the third axis L 3 .

In the illustrated embodiment, The light emitted from the first light source 31 , the light emitted from the second light source 32 and the light emitted from the third light source 33 respectively enters the lens 100 a along the first axis L 1 of the first light concentrating portion 21 , the second axis L 2 of the second light concentrating portion 22 and the third axis L 3 of the third light concentrating portion 23 to gather to form the light spot C. The light spot C has a biggest light intensity.

FIG. 6 illustrates a light emitting device 200 b having a lens 100 b of a third embodiment. A first groove 210 is formed on the first light concentrating portion 21 and at the first axis L 1 . A second groove 220 is formed on the second light concentrating portion 22 and at the second axis L 2 . The first groove 210 receives the first light source 31 therein. The second groove 220 receives the second light source 32 therein.

Specifically, the first groove 210 is surrounded by a first side wall 2101 , a second side wall 2102 and a first bottom wall 2103 connecting with the first side wall 2101 and the second side wall 2102 . The first side wall 2101 and the second side wall 2102 are parallel with the first axis L 1 and can reflect light. The first bottom wall 2103 is convex toward the opening of the first groove 210 to gather light. The first bottom wall 2103 can gather the light to enter the first light concentrating portion 21 along the first axis L 1 .

The second groove 220 is surrounded by a first side wall 2201 , a second side wall 2202 and a second bottom wall 2203 connecting with the first side wall 2201 and the second side wall 2202 . The first side wall 2201 and the second side wall 2202 are parallel with the second axis L 2 and can reflect light. The second bottom wall 223 is convex toward the opening of the second groove 220 to gather light. The second bottom wall 2203 can gather the light to enter the second concentrating portion 22 along the second axis L 2 .

As illustrated in FIG. 7 , a lens 100 c of a fourth embodiment is similar to the lens 100 of the first embodiment. Further, the lens 100 c includes a third light concentrating portion 23 a and a fourth light concentrating portion 24 . The third light concentrating portion 23 a is located at a side of the first light concentrating portion 21 away from the second light concentrating portion 22 . The fourth light concentrating portion 24 is located at a side of the second light concentrating portion 22 away from the first light concentrating portion 21 . The third light concentrating portion 23 a has a third axis L 3 ′. The fourth light concentrating portion 24 has a fourth axis L 4 . The third axis L 3 ′ and the fourth axis L 4 intersect at an extending direction thereof.

An angle α 3 is defined between the third axis L 3 ′ and a line O 3 -O 3 ′ perpendicularly to the first side 101 of the substrate 10 . An angle α 4 is defined between the fourth axis L 4 and a line O 4 -O 4 ′ perpendicularly to the first side 101 of the substrate 10 . The angle α 3 is more than the angle α 1 , the angle α 4 is more than the angle α 2 .

A light emitting device 200 c having the lens 100 c of a fourth embodiment includes a third light source 33 and a fourth light source 34 . The third light source 33 is corresponding to the third concentrating portion 23 a and at the third axis L 3 ′. The fourth light source 34 is corresponding to the fourth light concentrating portion 24 and at the fourth axis L 4 . In the illustrated embodiment, the luminescence center of the third light source 33 is at the third axis L 3 ′. The luminescence center of the fourth light source 34 is at the fourth axis L 4 . The light emitted from the first light source 31 , the second light source 32 , the third light source 33 and the fourth light source 34 enters the lens 100 c to gather to form the light spot C above the first side 101 of the substrate 10 . The light spot C has highest a light intensity.

As similar to the lens 100 of the first embodiment of FIG. 2 , a vertical distance between the luminescence center of the third light source 33 and the first side 101 of the substrate 10 is D 3 . A vertical distance between the luminescence center of the fourth light source 34 and the first side 101 of the substrate 10 is D 4 . A vertical distance between the luminescence center of the third light source 33 a and the line L 0 is A 3 . A vertical distance between the luminescence center of the fourth light source 34 and the line L 0 is A 4 . A vertical distance between the center of the light spot C and the first side 101 of the substrate 10 is L. The reflective index of the lens 100 c is N. So light enters the lens 100 c along the first axis L 1 , the second axis L 2 , the third axis L 3 ′ and the fourth axis L 4 satisfies the following relations:

D 1*Tan(α1)+ L *Tan(Sin−1( N *Sin(α1)))= A 1  (5)

D 2*Tan(α2)+ L *Tan(Sin−1( N *Sin(α2)))= A 2  (6)

D 3*Tan(α3)+ L *Tan(Sin−1( N *Sin(α3)))= A 3  (7)

D 4*Tan(α4)+ L *Tan(Sin−1( N *Sin(α4)))= A 4  (8)

According to above equation (6) (7) (8), the n light concentrating portion satisfies the following relations:

Dn *Tan(α n )+ L *Tan(Sin−1( N *Sin(α n )))= An   (9)

The αn is defined between the n axis of the n light concentrating portion and the a imaginary line On-On′ perpendicularly to the first side 101 of the substrate 10 . A vertical distance defined between the luminescence center of the n light source is Dn. A vertical distance defined between the luminescence center of the n light source and the line L 0 is An. A parameter δ can be introduced in the equation (9) as following:

Dn *Tan(α n )+ L *Tan(Sin −1 ( N *Sin(α n )))= An+δn   (10)

The n is natural numbers. The δn is a half of the biggest light intensity of the n light source.

As illustrated in FIG. 8 , a lens 100 d of a fifth embodiment is showed. The first groove 210 is formed on the first light concentrating portion 21 to receive the first light source 31 therein. The second groove 220 is formed on the second light concentrating portion 22 to receive the second light source 32 . The third groove 230 is formed on the third light concentrating portion 23 a to receive the third light source 33 therein. The fourth groove is formed on the fourth light concentrating portion 24 to receive the fourth light source 34 therein.

The light emitted from the first light source 31 , the second light source 32 , the third light source 33 and the fourth light source 34 respectively enters the first light concentrating portion 21 , the second light concentration portion 22 , the third light concentration 23 a , and the fourth light concentrating portion 24 respectively along the first axis L 1 , the second axis L 2 , the third axis L 3 ′ and the fourth axis L 4 , such that the light is gathered to form the light spot C above the first side of the substrate 10 of the lens 100 d.

As illustrated in FIG. 9 , a lens 100 e of a sixth embodiment is illustrated. The substrate 10 of the lens 100 e includes a first substrate 10 a , a second substrate 10 b , the first concentrating portion 21 extending outward from the first substrate 10 a , and the second concentrating portion 22 extending outward from the second substrate 10 b.

The first substrate 10 a includes a first side 101 a and a second side 102 a located opposite at the first side 101 a . The first concentrating portion 21 extending away from the second side 102 a of the first substrate 10 a . The second substrate 10 b includes a first side 101 b and a second side 102 b located opposite at the first side 101 b . The second light concentrating portion 22 extends away from the second side 102 b of the second substrate 10 b . An angle θ is defined between the first substrate 10 a and the second substrate 10 b . In this embodiment, the angle θ is equal to or smaller than 180°.

A light emitting device 200 e having the lens 100 e of the sixth embodiment includes the first light source 31 corresponding to the first light concentrating portion 21 and the second light source 32 corresponding to the second concentrating portion 22 . The luminescence center of the first light source 31 is at the first axis L 1 , the luminescence center of the second light source 32 is at the second axis L 2 .

The light emitted from the first light source 31 and the light emitted from the second light source 32 respectively enters the lens 100 e along the first axis L 1 of the first light concentrating portion 21 and the second axis L 2 of the second light concentrating portion 22 to gather to form the light spot C. The light spot C has highest light intensity.

The embodiments shown and described above are only examples. Many details are often found in the art such as the other features of a lens and a light emitting device having the same. Therefore, many such details are neither shown nor described. Even though numerous characteristics and advantages of the present technology have been set forth in the foregoing description, together with details of the structure and function of the present disclosure, the disclosure is illustrative only, and changes can be made in the detail, including in matters of shape, size and arrangement of the parts within the principles of the present disclosure up to, and including the full extent established by the broad general meaning of the terms used in the claims. It will therefore be appreciated that the embodiments described above can be modified within the scope of the claims.