CN201637870U - Total reflection lens with adjustable beam angle - Google Patents

Abstract

The utility model discloses a total reflection lens with an adjustable beam angle, which comprises a convex lens which condenses light in center, a prism with total reflection side faces and a flange at the upper edge of the convex lens. The upper surface of the convex lens is an aspheric surface, and the lower surface is an annular Fresnel surface. The concave incidence surface of the prism is a conical surface, the outer surface of the prism is a curved surface, and the lower surface of the prism is a quadratic surface. The beam angle of the total reflection lens is adjustable because of the convex lens with condensing center and the particular shape of the reflecting surfaces and the incidence surface of the prism with total reflection side faces.

Description

The total reflection lens that a kind of beam angle is adjustable

Technical field

The utility model relates to the total reflection lens technical field, especially relates to the adjustable total reflection lens of a kind of beam angle.

Background technology

Present nearly all LED total reflection lens, its beam angle all is to have only a degree of fixation value.The LED total reflection lens of using as electric torch, be that the single light that LED is sent collimates as much as possible, hot spot is poly-as to finish possible for a short time, and its beam angle is greatly in 10 °, and the indoor LED Down lamp that is used for floodlighting, the beam angle of its total reflection lens is more than 30 °.For some alert scenes with operation, such as the traffic police requires the beam angle of operation light fixture to regulate with the distance of target when handle traffic hazard night; When target range is far away, require the beam angle of working light very little, so that there is enough brightness can throw light on and recognition objective; When target range is nearer, require the beam angle of working light very big again, so that can illuminate whole target simultaneously, but there is not the adjustable total reflection lens of a kind of beam angle in the prior art.

The utility model content

Technical problem to be solved in the utility model provides the adjustable total reflection lens of a kind of beam angle, and its beam angle is adjustable continuously.

For solving technical matters of the present utility model, the utility model discloses the adjustable total reflection lens of a kind of beam angle, convex lens, the prism of side total reflection and the flange of lens upper edge of optically focused in the middle of comprising, the upper surface of described convex lens is a non-spherical surface, and lower surface is the Fresnel surface of ring grain; The plane of incidence of the indent of prism is a circular conical surface, and the outside of prism is a curved surface, and the upper surface of prism is a quadric surface.

Preferably, the angle of the bus of the plane of incidence of described prism indent and optical axis is 7 °.

Preferably, the outside fully reflecting surface of described prism is the fully reflecting surface of B-spline surface.

Preferably, described flange go up lower surface be the plane, the lateral surface of flange is the face of cylinder.

Preferably, the radius-of-curvature of the upper surface of described convex lens is 8.991401mm; The radius-of-curvature of the lower surface of described convex lens is-50.70318mm.

Preferably, the radius-of-curvature of the upper surface of described prism is-16.81945mm.

Preferably, effective exiting surface of described lens is of a size of 26mm.

Preferably, the diameter of described flange is 28mm, and the thickness of flange is 2mm.

Preferably, the height of the outside, the outside of described prism reflecting surface is 11.95472mm.

Preferably, the bottom inlet diameter of the circular cone of the plane of incidence of the indent of described prism is 14.6mm.

Compared with prior art, the utlity model has following beneficial effect: convex lens and the reflecting surface of the prism of side total reflection and the special shape of the plane of incidence of the utility model by middle optically focused, thus it is adjustable that beam angle is connected.

Description of drawings

Fig. 1 is the adjustable total reflection lens sectional view of beam angle of the present utility model;

Fig. 2 is the axis side view that waits of the adjustable total reflection lens of beam angle of the present utility model;

Fig. 3 is the vertical view of the adjustable total reflection lens of beam angle of the present utility model;

Fig. 4 is the front elevation of the adjustable total reflection lens of beam angle of the present utility model;

Fig. 5 is the backplan of the adjustable total reflection lens of beam angle of the present utility model;

Fig. 6 is the section size figure of total reflection lens of the present utility model;

Fig. 7 is the optical Design figure of lens of the present utility model;

Fig. 8 is the distance from top of the Fresnel surface of lens of the present utility model and LED when being 7.3mm, the relative position figure of lens and LED;

Fig. 9 is the distance from top of the Fresnel surface of lens of the present utility model and LED when being 0.3mm, the relative position figure of lens and LED;

Figure 10 is when to be lens of the present utility model bottom with the distance from top of LED be 7.3mm, the ray tracing figure of total reflection lens;

When the distance from top of lens of the present utility model bottom and LED is 0.3mm among Figure 11, the ray tracing figure of total reflection lens.

Embodiment

Below in conjunction with drawings and Examples, the utility model is described in further detail.

As shown in Figure 1, Figure 2, Figure 3 and Figure 4, the total reflection lens that beam angle of the present utility model is adjustable comprise be positioned in the middle of, be used for optically focused convex lens 1, be positioned at the total reflection prism 2 of side and be positioned at the flange 3 that the lens upper edge is used to assemble.Wherein, the upper surface 11 of described convex lens 1 is a non-spherical surface, and lower surface 12 is the Fresnel surface of ring grain, as shown in Figure 5.The plane of incidence of the indent of prism 2 is a circular conical surface, and the outside fully reflecting surface 22 of prism 2 is rotating cambered surface, and this rotating cambered surface is a B-spline surface, satisfies the total reflection condition of light, and the upper surface 23 of prism 2 is a quadric surface.The outside fully reflecting surface 22 of prism 2 is.In addition, described flange 3 go up lower surface be the plane, the lateral surface of flange 3 is the face of cylinder.

As shown in Figure 6, in the present embodiment, preferably, the bus of the plane of incidence 21 of described prism 2 indents and the angle of optical axis are 7 °.The radius-of-curvature of the upper surface 11 of described convex lens 1 is 8.991401mm, and the radius-of-curvature of lower surface 12 is-50.70318mm that effective exiting surface of convex lens 1 is of a size of 26mm.

Preferably, the radius-of-curvature of the upper surface 23 of described prism 2 is-16.81945mm, and the height of outside fully reflecting surface 22 is 11.95472mm, and the bottom inlet diameter of the circular cone plane of incidence 21 of indent is 14.6mm.

Preferably, the diameter of described flange is 28mm, and the thickness of flange is 2mm.

As shown in Figure 7, be the optical Design figure of lens of the present utility model.Lens are positioned over the top of high power white light LED 4, from the light that the O of chip center point sends, the angle of itself and optical axis 5 ± 30 ° with interior light, directly be used for the convex lens 1 of optically focused and carry out the standard value by center section.Remaining from the O of chip center point that send with the light of angle optical axis 5 beyond ± 30 °, can be through the conical surface plane of incidence 21 of the indent of prism 2, the fully reflecting surface 22 through the outside carries out total reflection again, converges at focal point F then.O of chip center and focal point F be with respect to fully reflecting surface 22 conjugate points each other, i.e. F and O point object-image relation each other.The upper surface 11 of convex lens 1 is an aspheric surface, and aspheric formula such as following formula are expressed:

$z=\frac{{\mathrm{<figure-callout\; id="2"\; label="cr"\; filenames="H2009202614568E00011.png"\; state="\{\{state\}\}">cr</figure-callout>}}^2}{1+\sqrt{1-(1+k)c^2{\mathrm{<figure-callout\; id="2"\; label="r"\; filenames="H2009202614568E00011.png"\; state="\{\{state\}\}">r</figure-callout>}}^2}}+a_1{\mathrm{<figure-callout\; id="2"\; label="r"\; filenames="H2009202614568E00011.png"\; state="\{\{state\}\}">r</figure-callout>}}^2+a_2{r}^4+a_3{r}^6+a_4{r}^8+a_5{r}^{10}+a_6{\mathrm{<figure-callout\; id="12"\; label="r"\; filenames="H2009202614568E00011.png,H2009202614568E00031.png"\; state="\{\{state\}\}">r</figure-callout>}}^{12}+a_7{r}^{14}+a_8{r}^{16}$

Wherein, z is that rise, c are curvature, and it is that polar coordinates position, the a1～a8 of aperture of lens is every asphericity coefficient for the inverse of radius of curvature R, r, and k is the tapering coefficient, and in the utility model, preferred aspheric every coefficient is respectively:

$c=\frac{1}{R}=\frac{1}{8.991401}=0.11121737313239616384587896813856$

k＝-1.031156

a ₁＝0

a ₂＝6.5800441e-005

a ₃＝2.1734322e-008

a ₄＝-1.33741e-009

a ₅＝0

a ₆＝0

a ₇＝0

a ₈＝0

In addition, prism 2 upper surfaces 23 are for being the quadric surface of virtual focus with the F point, converge at light that F order through behind the upper surface 23, the collimation ejaculation.Quadric expression formula such as following formula:

$z=\frac{{\mathrm{<figure-callout\; id="2"\; label="cr"\; filenames="H2009202614568E00011.png"\; state="\{\{state\}\}">cr</figure-callout>}}^2}{1+\sqrt{1-(1+k)c^2{\mathrm{<figure-callout\; id="2"\; label="r"\; filenames="H2009202614568E00011.png"\; state="\{\{state\}\}">r</figure-callout>}}^2}}$

Wherein, z is that rise, c are curvature, and it is that polar coordinates position, the k of aperture of lens is the tapering coefficient for the inverse of radius of curvature R, r, and in the utility model, the curvature and the tapering coefficient of preferred quadric surface 23 are:

$c=\frac{1}{R}=\frac{1}{-16.81945}=-0.05945497623287325090891794916005$

k＝-0.4493705

This shows that the light from the O of chip center point sends through the convex lens 1 of lens and the reflex of prism 2, can form the light beam of collimation.

In the present embodiment, high power white light LED 4 is preferably beam angle greater than 90 ° LED, or the LED of Lang Baixing.

As Fig. 8 and shown in Figure 9, when the distance from top of the Fresnel surface 12 of middle convex lens 1 bottom and LED was 7.3mm, LED was positioned at the equivalent focus position of secondary lens, the accurate basically value of lens bright dipping at this moment, and its beam angle is approximately 8 °.When the distance from top of the Fresnel surface 12 of middle convex lens 1 bottom and LED was 0.3mm, the beam angle of lens bright dipping became 45 °.Be that the distance that lens can be reconciled continuously is 7mm, thereby realized the total reflection lens that beam angle is adjustable.

Ray tracing figure when the relative position of lens and LED is respectively 7.3mm and 0.3mm respectively as shown in Figure 10 and Figure 11, as can be seen from the figure, when the distance from top of Fresnel surface 12 and LED is 7.3mm, the accurate basically value of lens bright dipping, when the distance from top of Fresnel surface 12 and LED was 0.3mm, most light came luminous intensity distribution by the convex lens 1 of centre.Form beam angle and be approximately 45 ° hot spot.

Claims (10)

1. total reflection lens that beam angle is adjustable, convex lens, the prism of side total reflection and the flange of lens upper edge of optically focused is characterized in that the upper surface of described convex lens is a non-spherical surface in the middle of comprising, lower surface is the Fresnel surface of ring grain; The plane of incidence of the indent of prism is a circular conical surface, and the outside of prism is a curved surface, and the upper surface of prism is a quadric surface.

2. the adjustable total reflection lens of beam angle as claimed in claim 1 is characterized in that the bus of the plane of incidence of described prism indent and the angle of optical axis are 7 °.

3. the adjustable total reflection lens of beam angle as claimed in claim 1 or 2 is characterized in that the outside fully reflecting surface of described prism is the fully reflecting surface of B-spline surface.

4. the adjustable total reflection lens of beam angle as claimed in claim 1 or 2 is characterized in that, described flange go up lower surface be the plane, the lateral surface of flange is the face of cylinder.

5. the adjustable total reflection lens of beam angle as claimed in claim 1 or 2 is characterized in that the radius-of-curvature of the upper surface of described convex lens is 8.991401mm; The radius-of-curvature of the lower surface of described convex lens is-50.70318mm.

6. the adjustable total reflection lens of beam angle as claimed in claim 1 or 2 is characterized in that the radius-of-curvature of the upper surface of described prism is-16.81945mm.

7. the adjustable total reflection lens of beam angle as claimed in claim 1 or 2 is characterized in that effective exiting surface of described lens is of a size of 26mm.

8. the adjustable total reflection lens of beam angle as claimed in claim 4 is characterized in that the diameter of described flange is 28mm, and the thickness of flange is 2mm.

9. the adjustable total reflection lens of beam angle as claimed in claim 8 is characterized in that, the height of the outside, the outside reflecting surface of described prism is 11.95472mm.

10. the adjustable total reflection lens of beam angle as claimed in claim 9 is characterized in that the bottom inlet diameter of the circular cone of the plane of incidence of the indent of described prism is 14.6mm.

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