CN102748707B - Floodlight total-reflection lens and LED (Light Emitting Diode) lamp using lens - Google Patents

Abstract

The invention relates to a floodlight total-reflection lens. The total-reflection lens is a rotary body with a rotary bus as a folding line; the rotary bus of the rotary body is the folding line which is formed by connecting four line sections in sequence; a light source mounting hole is formed on the light incoming surface of the total-reflection lens; a conical concave surface is arranged on the center of the light emitting surface, wherein the peak of the conical concave surface is on the symmetrical shaft of the total-reflection lens; the light source mounting hole comprises a cylindrical blind hole and a conical concave hole formed by extending the cylindrical blind hole inwards; and the symmetrical shaft of the cylindrical blind hole and the symmetrical shaft of the total-reflection lens are overlapped, and the peak of the conical concave hole is on the symmetrical shaft of the total-reflection lens. According to the floodlight total-reflection lens, the rotary bus of the floodlight total-reflection lens adopts the folding line, so that the total-reflection lens meets the requirements of a lighting angle and realizes the floodlight lighting, and simultaneously, the volume is minimized; and the light angle of a light source close to an optical axis can be enlarged through the conical concave surface of the light emitting surface and the bottom conical concave hole, and the lighting uniformity of the lamp in the lighting angle is improved greatly.

Description

A kind of floodlight total-reflection lens and use the LED light fixture of these lens

Technical field

The present invention relates to lens technologies field, more particularly, relate to a kind of floodlight total-reflection lens and use the LED light fixture of these lens.

Background technology

LED lamp is generally adopted to reflector luminous intensity distribution, but this mode not very desirable to the processing of light type, especially larger along the light intensity of LED optical axis direction, always there will be again the light intensity of dipped beam shaft portion higher but carry out luminous intensity distribution by reflector.In addition, also have the convex lens of employing to carry out optically focused to LED, but this mode is lower to the utilization rate of LED luminous flux, shows that the light that LED light emitting anger is larger cannot be utilized, finally cause the light efficiency utilization rate of light fixture low.Also has at present a class flood lens, on the basis of LED optically focused total reflection lens (as shown in Figure 1), on its exiting surface (100 in Fig. 1), process densely covered small salient point or adopt frosted processing to realize the effect of floodlight, the floodlight effect that these processing modes reach is all even not, and floodlight angle is little, low to the utilization rate of light.

In addition, existing lensed rotation bus is generally straight line or parabola, and the lens sizes that meets successively light distribution requirements is all larger.

Summary of the invention

The technical problem to be solved in the present invention is, for the above-mentioned defect of prior art, a kind of floodlight total-reflection lens is provided and uses the LED light fixture of this total reflection lens.

The technical solution adopted for the present invention to solve the technical problems is: construct a kind of floodlight total-reflection lens, the revolving body that this total reflection lens rotation bus is broken line, the rotation bus of described revolving body be four line segments join successively form broken line, the incidence surface of described total reflection lens is provided with light source mounting hole, and the exiting surface center of described total reflection lens is provided with summit and drops on the conical concave surface on described total reflection lens symmetry axis;

Described light source mounting hole comprises blind cylindrical hole and by the described blind cylindrical hole conical shrinkage pool forming that extends internally; The symmetry axis of described blind cylindrical hole overlaps with the symmetry axis of described total reflection lens, and the summit of described conical shrinkage pool is dropped on the symmetry axis of described total reflection lens.

Floodlight total-reflection lens of the present invention, wherein, described four articles of line segments are followed successively by the first line segment, the second line segment, the 3rd line segment and the 4th line segment, take the incidence surface center of described total reflection lens as initial point, its symmetry axis is X-axis, the straight line of also crossing initial point vertical with X-axis is that Y-axis is set up rectangular coordinate system, and the incidence surface diameter of described total reflection lens is d:

Described the first line segment take in Y-axis apart from initial point d/2 place as starting point, be 36.5 ° of angles with X-axis, be 10 ° of angles with Y-axis;

Described the second line segment, take the terminal of described the first line segment as starting point, is 26.5 ° of angles with X-axis, is 20 ° of angles with Y-axis;

Described the 3rd line segment, take the terminal of described the second line segment as starting point, is 16.5 ° of angles with X-axis, is 30 ° of angles with Y-axis;

Described the 4th line segment, take the terminal of described the 3rd line segment as starting point, is 6.5 ° of angles with X-axis, is 40 ° of angles with Y-axis.

Floodlight total-reflection lens of the present invention, wherein, the angle of the bus of described conical concave surface and described total reflection lens symmetry axis is θ, and described conical concave surface summit is L to the vertical range of described total reflection lens incidence surface, and θ and L meet following formula:

θ＝90-α(η-L)/(2n-2)

In formula, α=15 °, η=1.9～2.0, and η > n, the refractive index that n is total reflection lens.

Floodlight total-reflection lens of the present invention, wherein, the bus of described cone-shaped groove and the angle of described total reflection lens are θ, the degree of depth of described blind cylindrical hole is

θ with meet following formula:

$\mathrm{\θ}=90-\mathrm{\α}(\mathrm{\η}-l)/(2n-2)$

In formula, α=15 °, η=1.9～2.0, and η > n, the refractive index that n is total reflection lens.

Floodlight total-reflection lens of the present invention, wherein, described total reflection lens is by transparent material injection mo(u)lding, and described transparent material comprises optical glass or optical plastic.

Floodlight total-reflection lens of the present invention, wherein, the refractive index of described transparent material is greater than 1.45.

Another technical scheme that the present invention solves its technical problem employing is: construct a kind of LED light fixture, comprise LED, this light fixture also comprises floodlight total-reflection lens described above.

LED light fixture of the present invention, wherein, the light emitting anger of described LED is 110-130 °.

LED light fixture of the present invention, wherein, the external diameter of described LED is less than or equal to 5mm.

LED light fixture of the present invention, wherein, the optical axis of described LED overlaps with the symmetry axis of described total reflection lens.

Implement floodlight total-reflection lens of the present invention, there is following beneficial effect: the rotation bus of floodlight total-reflection lens of the present invention has adopted broken line, make this total reflection lens volume in meeting light emitting anger requirement and realizing floodlighting can accomplish as much as possible little; The conical concave surface of its exiting surface and the conical shrinkage pool of bottom can expand the light angle of light source dipped beam shaft portion, have greatly improved the uniformity of illuminance of light fixture in light emitting anger.

Accompanying drawing explanation

Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:

Fig. 1 be in prior art flood lens structural representation;

Fig. 2 is the structural representation of a kind of floodlight total-reflection lens preferred embodiment of the present invention;

Fig. 3 is the front view of a kind of floodlight total-reflection lens preferred embodiment of the present invention;

Fig. 4 is the A-A view in front view in a kind of floodlight total-reflection lens preferred embodiment of the present invention;

Fig. 5 is the structural parameters figure of a kind of floodlight total-reflection lens preferred embodiment of the present invention;

Fig. 6 is the index path of a kind of floodlight total-reflection lens preferred embodiment of the present invention;

Fig. 7 is the distribution curve flux figure of a kind of floodlight total-reflection lens preferred embodiment of the present invention.

The specific embodiment

Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are elaborated.

As shown in Figure 2, simultaneously referring to Fig. 3 and Fig. 4.In a preferred embodiment of the invention, this total reflection lens is the revolving body that rotation bus is broken line, wherein, the rotation bus of revolving body is joined and forms successively by four line segments, its bottom is provided with light source mounting hole, and its exiting surface center is provided with summit and drops on the conical concave surface 3 on total reflection lens symmetry axis.Above-mentioned light source mounting hole comprises the conical shrinkage pool 2 that is positioned at the blind cylindrical hole 1 at total reflection lens incidence surface center and joins with blind cylindrical hole 1, and wherein blind cylindrical hole 1 is for installing light source.The symmetry axis of this blind cylindrical hole 1 overlaps with the symmetry axis of total reflection lens, and the summit of conical shrinkage pool 2 is dropped on the symmetry axis of total reflection lens, and understandable, and the diameter of blind cylindrical hole 1 equates with the incidence surface radius of conical shrinkage pool 2.

Conical shrinkage pool 2 and conical concave surface 3 can divergent light source dipped beam shaft portion light, make light fixture luminous more even in certain illumination range thereby make the light of this part be unlikely to concentrate very much.And the rotation bus of total reflection lens has adopted broken line to make total reflection lens can accomplish as much as possible little meeting the prerequisite lower volume that light emitting anger and floodlighting require.Diameter that it should be noted that blind cylindrical hole 1 should determine according to the size of light source, conventionally need to allow the diameter of blind cylindrical hole 1 be greater than the external diameter of light source insertion portion, the radiation response of the length that its degree of depth is greater than light source insertion portion to obtain.

Further, as shown in Figure 5, the rotation bus broken line of total reflection lens is joined and forms successively by four line segments, article four, line segment is followed successively by the first line segment 101, the second line segment 102, the 3rd line segment 103 and the 4th line segment 104, take the incidence surface center of total reflection lens as initial point, its symmetry axis is X-axis, and straight line vertical with X-axis and that cross initial point is that Y-axis is set up rectangular coordinate system, and the incidence surface diameter of definition total reflection lens is d:

The first line segment 101 take in Y-axis apart from initial point d/2 place as starting point, be 36.5 ° of angles with X-axis, be 10 ° of angles with Y-axis;

The second line segment 102, take the terminal of the first line segment 101 as starting point, is 26.5 ° of angles with X-axis, is 20 ° of angles with Y-axis;

The 3rd line segment 103, take the terminal of the second line segment 102 as starting point, is 16.5 ° of angles with X-axis, is 30 ° of angles with Y-axis;

The 4th line segment 104, take the terminal of the 3rd line segment 103 as starting point, is 6.5 ° of angles with X-axis, is 40 ° of angles with Y-axis.

Article four, the parameter of line segment has not only determined degree of depth h and the exiting surface diameter D of this total reflection lens, has also determined to a certain extent the light emitting anger of this total reflection lens.In a preferred embodiment of the invention, the light emitting anger that meets the total reflection lens of above-mentioned parameter is 80 °.

Further, the angle of the bus of conical concave surface 3 and total reflection lens symmetry axis is θ, and its summit is L to the vertical range of total reflection lens incidence surface, and θ and L meet following formula:

θ＝90-α(η-L)/(2n-2)

In formula, α=15 °, η=1.9～2.0, and η > n, the refractive index that n is total reflection lens.

In above-mentioned formula, L is slightly less than the degree of depth h of total reflection lens conventionally, generally gets L=0.6-0.8h.

Again, the bus of cone-shaped groove 2 and the angle of total reflection lens are θ, and the degree of depth of blind cylindrical hole 1 is

θ with

meet following formula:

$\mathrm{\θ}=90-\mathrm{\α}(\mathrm{\η}-l)/(2n-2)$

In formula, α=15 °, η=1.9～2.0, and η > n, the refractive index that n is total reflection lens.

Above-mentioned formula is that reverse derivation comes according to the light emitting anger of light fixture requirement, the value of two θ can be the same or different, object is to allow as far as possible cone-shaped groove 2 and conical concave surface 3 in divergent rays, light can be reflected in as far as possible in the light emitting anger of light fixture regulation to improve the light efficiency utilization rate of total reflection lens.

Now in conjunction with the design parameter of total reflection lens, the invention will be further described:

Suppose that total reflection lens adopts PC material as lens material, the refractive index of PC material is 1.59, and rotation bus broken line meets above-mentioned parameter, and the external diameter that light source inserts blind cylindrical hole 1 is less than 3mm, and other concrete structure parameters are as shown in the table:

Meet said structure parameter total reflection lens index path as shown in Figure 6, the light of light source mid portion has expanded angle, the outgoing after total reflection of the light of other parts through the refraction of total reflection lens.Light is towards the light of total reflection lens symmetry axis one side direction outgoing, and its exit direction is towards the opposite side direction of symmetry axis, and light is interleaved mode outgoing.Distribution curve flux figure as shown in Figure 7.From distribution curve flux figure, can find out, lamp luminescence angle is 80 °, and illumination is very even in this light emitting anger.

Preferably, above-mentioned total reflection lens is by transparent material injection mo(u)lding, and transparent material comprises optical glass or optical plastic, and the refractive index of transparent material is greater than 1.45.In addition, for the reflectivity that improves total reflection lens plates the anti-film of increasing in the side of total reflection lens again.

In another specific embodiment of the present invention, a kind of LED light fixture comprises above-mentioned floodlight total-reflection lens and be located at the LED in this floodlight total-reflection lens light source mounting hole, and the light emitting anger of this LED is 110 °, can be also 120 ° or 130 °.It should be noted that the result of use in order to guarantee floodlight total-reflection lens, the external diameter of LED had better not exceed 5mm, is 4mm in this embodiment, as required, can be also 3mm.Further, in the time placing LED, should guarantee that the optical axis of LED overlaps with the optical axis of total reflection lens (being symmetry axis), and should allow the luminescence chip of LED lamp drop on the incidence surface of total reflection lens.

Above embodiment is only explanation technical conceive of the present invention and feature, and its object is to allow person skilled in the art can understand content of the present invention and implement accordingly, can not limit the scope of the invention.All equalizations of doing with the claims in the present invention scope change and modify, and all should belong to the poor scope of culvert of the claims in the present invention.

Claims (9)

1. a floodlight total-reflection lens, it is characterized in that, this total reflection lens is the revolving body that rotation bus is broken line, the rotation bus of this revolving body be four line segments join successively form broken line, the incidence surface of described total reflection lens is provided with light source mounting hole, and the exiting surface center of described total reflection lens is provided with summit and drops on the conical concave surface (3) on described total reflection lens symmetry axis;

Described light source mounting hole comprises blind cylindrical hole (1) and by described blind cylindrical hole (1) the conical shrinkage pool (2) forming that extends internally; The symmetry axis of described blind cylindrical hole (1) overlaps with the symmetry axis of described total reflection lens, and the summit of described conical shrinkage pool (2) is dropped on the symmetry axis of described total reflection lens;

The bus of described conical concave surface (3) and the angle of described total reflection lens symmetry axis are θ, and the summit of described conical concave surface is L to the vertical range of described total reflection lens incidence surface, and θ and L meet following formula:

θ=90°-α(η-L)/(2n-2)

In formula, α=15 °, η=1.9～2.0, and η >n, the refractive index that n is total reflection lens.

2. floodlight total-reflection lens according to claim 1, it is characterized in that, described four articles of line segments are respectively the first line segment (101), the second line segment (102), the 3rd line segment (103) and the 4th line segment (104), take the incidence surface center of described total reflection lens as initial point, the symmetry axis of described total reflection lens is X-axis, the straight line of also crossing initial point vertical with X-axis is that Y-axis is set up rectangular coordinate system, and the incidence surface diameter of described total reflection lens is d:

Described the first line segment (101) take in Y-axis apart from initial point d/2 place as starting point, be 36.5 ° of angles with X-axis, be 10 ° of angles with Y-axis;

Described the second line segment (102), take the terminal of described the first line segment (101) as starting point, is 26.5 ° of angles with X-axis, is 20 ° of angles with Y-axis;

Described the 3rd line segment (103), take the terminal of described the second line segment (102) as starting point, is 16.5 ° of angles with X-axis, is 30 ° of angles with Y-axis;

Described the 4th line segment (104), take the terminal of described the 3rd line segment (103) as starting point, is 6.5 ° of angles with X-axis, is 40 ° of angles with Y-axis.

3. floodlight total-reflection lens according to claim 1, is characterized in that, the bus of described cone-shaped groove (2) and the angle of described total reflection lens symmetry axis are θ ', and the degree of depth of described blind cylindrical hole (1) is l, and θ ' meets following formula with l:

θ’=90°-α(η-l)/(2n-2)

In formula, α=15 °, η=1.9～2.0, and η >n, the refractive index that n is total reflection lens.

4. floodlight total-reflection lens according to claim 1, is characterized in that, described total reflection lens is by transparent material injection mo(u)lding, and described transparent material comprises optical glass or optical plastic.

5. floodlight total-reflection lens according to claim 4, is characterized in that, the refractive index of described transparent material is greater than 1.45.

6. a LED light fixture, comprises LED, it is characterized in that, this light fixture also comprises the arbitrary described floodlight total-reflection lens of claim 1 to 5.

7. LED light fixture according to claim 6, is characterized in that, the light emitting anger of described LED is 110-130 °.

8. according to the LED light fixture described in claim 6 or 7, it is characterized in that, the external diameter of described LED is less than or equal to 5mm.

9. LED light fixture according to claim 8, is characterized in that, the optical axis of described LED overlaps with the symmetry axis of described total reflection lens.

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