CN102654272A

CN102654272A - Condenser lens of LED (light emitting diode)

Info

Publication number: CN102654272A
Application number: CN2011100528540A
Authority: CN
Inventors: 周明杰; 罗英达
Original assignee: Oceans King Lighting Science and Technology Co Ltd; Shenzhen Oceans King Lighting Engineering Co Ltd
Current assignee: Oceans King Lighting Science and Technology Co Ltd; Shenzhen Oceans King Lighting Engineering Co Ltd
Priority date: 2011-03-04
Filing date: 2011-03-04
Publication date: 2012-09-05
Anticipated expiration: 2031-03-04
Also published as: CN102654272B

Abstract

The invention discloses a condenser lens of an LED (light emitting diode). The condenser lens is a rotary body in a shape of a circular truncated cone and is provided with an optical axis which is superposed with a rotary shaft of the rotary body. The condenser lens comprises a light source containing slot, a light emitting surface and a full reflecting surface, wherein the light source containing slot corresponds to a small end of the condenser lens, the light emitting surface corresponds to a large end of the condenser lens, the full reflecting surface is arranged on the outer sidewall of the condenser lens, the light source containing slot is a cylindrical slot, the bottom of the cylindrical slot is provided with an outwards protruded conical surface, the middle part of the light emitting surface is protruded outwards so as to form a spherical conical surface and an annular surface, the spherical surface is arranged at the middle part of the light emitting surface and is protruded outwards, the annular surface surrounds the spherical surface, the vertex of the conical surface and the spherical center of the spherical surface are positioned on the optical axis, and the spherical surface and the conical surface commonly define one central light condensation part. Compared with the prior art, the condenser lens of the LED, disclosed by the invention, has a high-efficiency condensation function on the LED, and a luminescence angle is very small after light rays emitted by the LED are acted by the condenser lens of the LED; and the condenser lens of the LED can further greatly improve the utilization rate of a lamp on the luminous flux of the LED when the light condensation function is ensured.

Description

A kind of LED collector lens

Technical field

The present invention relates to LED (Light Emitting Diode, light emitting diode) collector lens technical field, more particularly, relate to a kind of lens with high-effective concentration function.

Background technology

In order to realize optically focused to LED; A kind of way of prior art is to adopt to have paraboloidal reflector realization optically focused; But this mode but is difficult to be applied to the luminous angle occasion of little (as spending less than 5 when luminous angle); Must the reflector size be increased, otherwise the less light in luminous angle can't be utilized, increase the luminous angle of light the most at last.

Also occurred adopting convex lens that LED is carried out the technical scheme of optically focused in the prior art, but there is the lower problem of LED luminous flux utilization rate in these schemes, be in particular in that the bigger light in luminous angle can't be utilized, and has finally reduced the light efficiency of light fixture.

In addition; Some new LED collector lenses have also appearred in the prior art; The material of lens is generally PC (Poly Carbonate, Merlon) or PMMA (Polymethyl Methacrylate polymethyl methacrylate), and its principle is to utilize the total reflection and the refraction of light; Be made into the lens of comparison optically focused, realize converging light.But defectives such as these LED collector lenses exist moulding process to have relatively high expectations usually, and difficulty of processing is bigger.

Summary of the invention

Technical problem to be solved by this invention is to provide a kind of LED collector lens, and it has light-focusing function efficiently, and has higher LED luminous flux utilization rate.

For solving the problems of the technologies described above; A kind of technical scheme of the present invention is: a kind of LED collector lens is provided; Said collector lens is the revolving body that is round table-like, and has the optical axis that overlaps with the gyroaxis of revolving body, and said collector lens comprises the exiting surface of the light source holding tank of corresponding collector lens small end, the big end of corresponding collector lens and the fully reflecting surface that is positioned at the collector lens lateral wall; Said light source holding tank is the cylindrical groove that the bottom has the outwards outstanding conical surface; The middle part of said exiting surface is outwards outstanding, and forms and be positioned at center and outwards outstanding sphere and around the anchor ring of said sphere, the summit of the said conical surface and the centre of sphere of said sphere are positioned on the said optical axis; The said conical surface and said sphere define a center optically focused part jointly, and the bus of the said conical surface and the angle theta of said optical axis satisfy following formula:

In the formula, n is the refractive index of lens material, and the value of α is between 10-15 °, and η is a correction value, and value is between 0.3-0.8.

Following formula is satisfied to the distance L between the led chip light-emitting area in the radius R of said sphere and sphere summit:

R＝(n-1)L

Wherein, n is the refractive index of lens material.

More specifically, the refractive index n of said lens material is 1.59, and the angle theta of said bus and said optical axis is 80 °.

More specifically, the diameter of said light source holding tank is not more than 9 millimeters, and the distance between the summit of the said conical surface and the said small end is 3 millimeters.

More specifically, the bus of said revolving body is formed by connecting on the multistage line segment from beginning to end, and by said small end to said big end, the angle between said multistage line segment and the said optical axis reduces successively.

More specifically, the angle β of said multistage line segment and optical axis satisfies following formula:

In the formula, n is the refractive index of lens material, and m is for to begin from said small end, the sequence number number of each line segment in the said multistage line segment, and the value of λ is between 4-6 °.

More specifically, the value of λ is 5 °, and said multistage line segment comprises 8 sections line segments.

For solving the problems of the technologies described above; Another kind of technical scheme of the present invention is: a kind of LED collector lens is provided; Said collector lens is to be intersected and become one and constitute by a plurality of above-mentioned LED collector lenses; The anchor ring of said a plurality of collector lens exiting surfaces is positioned at same plane, and each sphere summit evenly distributes in the plane.

Compared with prior art, the present invention has light-focusing function efficiently to LED, and the light that LED sends is after LED collector lens of the present invention effect, and its emergent light is almost parallel with optical axis, and luminous angle is very little; When guaranteeing light-focusing function, the present invention also can greatly improve the utilization rate of light fixture to the LED luminous flux; In addition, the machine-shaping of LED collector lens of the present invention is also simple relatively, and it is very little that its size can be done, and helps realizing the miniaturization of light fixture.

Description of drawings

Fig. 1 is the schematic perspective view of the embodiment of the invention one;

Fig. 2 is the schematic side view of Fig. 1;

Fig. 3 is the cross-sectional schematic of Fig. 1;

Fig. 4 is a light path principle figure embodiment illustrated in fig. 1;

Fig. 5 is distribution curve flux figure embodiment illustrated in fig. 1;

Fig. 6 is the schematic perspective view of the embodiment of the invention two.

The specific embodiment

In order to make technical problem to be solved by this invention, technical scheme and beneficial effect clearer,, the present invention is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.

Please referring to figs. 1 through Fig. 3; Be embodiments of the invention one; Said collector lens L is the revolving body that is round table-like; And having the optical axis A that overlaps with the gyroaxis of revolving body, said collector lens comprises the exiting surface 2 of the light source holding tank 1 of corresponding collector lens small end, the big end of corresponding collector lens and the fully reflecting surface 3 that is positioned at the collector lens lateral wall.Said light source holding tank 1 has the cylindrical groove of the outwards outstanding conical surface 11 for the bottom, and the middle part of said exiting surface 2 is outwards outstanding, and forms and be positioned at center and outwards outstanding sphere 21 and around the anchor ring 22 of said sphere 21.The centre of sphere of the summit of the said conical surface 11 and said sphere 21 all is positioned on the said optical axis.The said conical surface 11 defines a center optically focused part jointly with said sphere 21.

Compared with prior art, present embodiment has light-focusing function efficiently to LED, and the light that LED sends is after LED collector lens of the present invention effect, and its emergent light is almost parallel with optical axis, and luminous angle is very little; When guaranteeing light-focusing function, the present invention also can greatly improve the utilization rate of light fixture to the LED luminous flux; In addition, the machine-shaping of LED collector lens of the present invention is also simple relatively, and it is very little that its size can be done, and helps realizing the miniaturization of light fixture.

Below present embodiment is done further to introduce in detail.

Please with reference to Fig. 3 and Fig. 4, the centre of sphere of the summit of the said conical surface 11 and said sphere 21 all is positioned on the said optical axis.The diameter D of said light source holding tank 1 is not more than 9 millimeters, and the distance between the summit of the said conical surface 11 and the said small end is 3 millimeters.

In the present embodiment, the angle theta of the bus of the said conical surface 11 and said optical axis A satisfies following formula:

Preferable scheme is that the employing refractive index is 1.59 PC material, and the said conical surface 11 is 80 ° with the bus of said sphere 21 and the angle theta of said optical axis.

In the present embodiment, following formula is satisfied to the distance of L between the led chip light-emitting area in the radius R of said sphere 21 and sphere 21 summits:

R＝(n-1)L

Wherein, n is the refractive index of lens material.

Like this; The center optically focused part that defines jointly by the said conical surface 11 and said sphere 21; Can play the effect of refraction to the smaller light in the luminous angle of LED; Emergent ray after said center optically focused partly reflects almost is parallel to optical axis A, and the luminous angle of emergent light is very little, has reached fabulous optically focused performance.

Please combine with reference to Fig. 2 and Fig. 3, the bus of present embodiment revolving body is formed by connecting 8 sections line segments (being the line segment 301-308 shown in Fig. 2) head and the tail.Thereby said fully reflecting surface 3 is made up of 8 round table surface.Small end by said collector lens is held to big, and the angle between said 8 sections line segments and the said optical axis reduces successively.In the present embodiment, the angle β of said 8 sections line segments and optical axis A satisfies following formula:

In the formula, n is the refractive index of lens material, and m is for to begin from said small end, and the sequence number number of each line segment in the said multistage line segment is respectively 1,2,3,4,5,6,7,8, and the value of λ is between 4-6 °.

In the present embodiment, 5 ° of the values of λ, like this, the angle between said 8 sections line segments and the optical axis A is as shown in the table respectively:

The angle of line segment 301 and optical axis A	43.43°
		The angle of line segment 302 and optical axis A	41.86°
The angle of line segment 303 and optical axis A	40.32°
		The angle of line segment 304 and optical axis A	38.79°
The angle of line segment 305 and optical axis A	37.29°
		The angle of line segment 306 and optical axis A	35.84°
The angle of line segment 307 and optical axis A	34.43°
		The angle of line segment 308 and optical axis A	33.08

Please with reference to Fig. 4, in the light that led chip penetrates, during the said fully reflecting surface 3 of the bigger light directive in these luminous angles that get into by light source holding tank 1 sidewall, total reflection takes place promptly.And the light of the overwhelming majority is reflected; The direction of propagation of reflection ray is also almost parallel with optical axis A, and penetrates from the anchor ring 22 of said exiting surface 2, behind the said anchor ring 22 of process; Deflection phenomenon can not take place in light basically yet, still propagates along the direction that is parallel to optical axis A.The luminous angle of emergent light is very little, has reached fabulous optically focused performance.

The collector lens of present embodiment is injection molded by transparent material.Can select PC or PMMA.Yes, for other transparent materials, as long as parameters can satisfy present embodiment and propose each item requirement, all can be used as the candidate material that is applied to present embodiment.

And present embodiment is owing to adopt rotary structure, and the said conical surface 11 is all controlled than being easier to the size of said sphere 21, and the machine-shaping of LED collector lens is also simple relatively, and it is very little that its size can be done, and helps realizing the miniaturization of light fixture.

Please with reference to Fig. 5, the distribution curve flux figure for present embodiment can be known by this figure, 5 ° of luminous angle less thaies.It is thus clear that present embodiment has light-focusing function efficiently, the light that LED sends is after LED collector lens of the present invention effect, and its emergent light is almost parallel with optical axis, and luminous angle is very little.

Please with reference to Fig. 6, be embodiments of the invention two, said collector lens is to be intersected and become one and constitute by 5 above-mentioned LED collector lens L, and said 5 collector lens exiting surfaces are positioned at same plane, and each sphere summit evenly distributes in the plane.Certainly, the quantity of collector lens can also be 3,4,6 or other quantity.

The above is merely preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of within spirit of the present invention and principle, being done, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.

Claims

1. LED collector lens; Said collector lens is the revolving body that is round table-like; And has an optical axis that overlaps with the gyroaxis of revolving body; It is characterized in that: said collector lens comprises the exiting surface of the light source holding tank of corresponding collector lens small end, the big end of corresponding collector lens and the fully reflecting surface that is positioned at the collector lens lateral wall, and said light source holding tank is the cylindrical groove that the bottom has the outwards outstanding conical surface, and the middle part of said exiting surface is outwards outstanding; And form and to be positioned at center and outwards outstanding sphere and around the anchor ring of said sphere; The summit of the said conical surface and the centre of sphere of said sphere are positioned on the said optical axis, and the said conical surface and said sphere define a center optically focused part jointly, and the bus of the said conical surface and the angle theta of said optical axis satisfy following formula:

R＝(n-1)L

Wherein, n is the refractive index of lens material.

2. LED collector lens as claimed in claim 1 is characterized in that: the refractive index n of said lens material is 1.59, and the angle theta of said bus and said optical axis is 80 °.

3. LED collector lens as claimed in claim 2 is characterized in that: the diameter of said light source holding tank is not more than 9 millimeters, and the distance between the summit of the said conical surface and the said small end is 3 millimeters.

4. like any described LED collector lens of claim 1 to 3, it is characterized in that: the bus of said revolving body is formed by connecting on the multistage line segment from beginning to end, and by said small end to said big end, the angle between said multistage line segment and the said optical axis reduces successively.

5. LED collector lens as claimed in claim 4 is characterized in that: the angle β of said multistage line segment and optical axis satisfies following formula:

6. LED collector lens as claimed in claim 5 is characterized in that: the value of λ is 5 °, and said multistage line segment comprises 8 sections line segments.

7. LED collector lens; Said collector lens is to be intersected and become one and constitute like any described LED collector lens of claim 1 to 6 by a plurality of; The anchor ring of said a plurality of collector lens exiting surfaces is positioned at same plane, and each sphere summit evenly distributes in the plane.