CN102997178A - Lens and lighting device with lens - Google Patents

Abstract

The invention relates to a lens for an illuminating device, which has a bottom surface (1) and a raised light exit surface (2) on said bottom surface (1), a recessed area (3) is formed in the center of the bottom surface (1), said The surface of the recessed area (3) forms a light incident surface (4), the light source (5) of the lighting device is arranged in the recessed area (3), and the optical axis of the recessed area (3) relative to the light source (5) (X) Rotational symmetry, wherein the light incident surface (4) is provided with a plurality of annular grooves (4a), the light from the light source (5) is refracted by these annular grooves (4a) and then passes through the light exit Surface (2) shoots out. Furthermore, the present invention also relates to an illuminating device having the above-mentioned type of lens.

Description

Lens and lighting device with the lens

technical field

The invention relates to a lens for an illuminating device. Furthermore, the present invention also relates to an illuminating device having the above-mentioned type of lens.

Background technique

With the development of LED lighting technology, more and more people use LED lighting devices as light sources in various environments. Due to the manufacturing tolerance of the LED chip, the brightness of the actual light spot formed by the light emitted by the LED chip on the object to be irradiated is usually not uniform. Sometimes the illumination is not very uniform and the color is not very uniform. In order to solve the above problems and obtain as good a lighting effect as possible, it is usually necessary to install a lens on the LED chip, and use the lens to adjust the light emitted by the LED chip. In the prior art, the exit surface of the lens is structured, that is to say, many randomly distributed convex or concave surfaces are formed on the exit surface, thereby forming a diffuse surface. This diffuser surface adjusts the light from the LED chips. Another solution is to directly add a diffuser screen on top of the lens to adjust the light of the LED chip. However, the light distribution of the light conditioned by the above-mentioned type of lens and diffuser screen is difficult to predict or simulate. The light distribution of the light conditioned by lenses and diffuser screens of the above type is random.

Contents of the invention

In order to solve the above problems, the present invention proposes a lens for an illuminating device, through which light emitted by the lens can achieve a desired light distribution effect on an object to be irradiated. In addition, the present invention also proposes an illuminating device having the above-mentioned type of lens.

The first object of the present invention is thus achieved by a lens which has a bottom surface and a raised light exit surface on the bottom surface, a recessed area is formed in the center of the bottom surface, and the surface of the recessed area forms a light incident surface for illumination. The light source of the device is arranged in the recessed area, and the recessed area is rotationally symmetrical with respect to the optical axis of the light source, wherein a plurality of annular grooves are provided on the light incident surface, and these annular grooves refract the light from the light source Emit through the light exit surface. In the design solution according to the present invention, the light from the light source is firstly refracted through the light incident surface provided with a plurality of annular grooves. The specific configuration and arrangement of the annular groove can be reversely calculated according to the desired light distribution.

According to a preferred design solution of the present invention, the recessed area is designed to be similar to a cone, the inner cone of the recessed area forms a light incident surface, and a plurality of annular grooves are respectively formed in the recessed area perpendicular to the optical axis. plane, and are arranged adjacent to each other from the bottom to the top of the recessed area. In this arrangement, each annular groove itself defines a plane which is respectively parallel to a plane perpendicular to the optical axis. The light from the light source can be adjusted to an expected angle through the annular groove, so as to obtain an expected light distribution.

Preferably, the top of the recessed area is designed to be spherical. Through the top of the sphere, the brightness of the edge and center of the light spot generated by the light from the light source passing through the lens is close to the same, without forming a brighter area in the center of the light spot, thereby obtaining a uniform light distribution.

According to a preferred design solution of the present invention, the section of the annular groove on the plane passing through the optical axis is an arc. This arc-shaped section is more conducive to the uniform distribution of light.

Preferably, the radius of the arc is between 0.1 and 0.5 mm. A circular arc in this range enables the light distribution to be as uniform as possible.

According to a preferred design solution of the present invention, the light exit surface includes a concavely curved middle region and a convexly curved edge region, and the middle region and the edge region make a smooth transition, wherein the middle region and the edge region are respectively relatively light Axis rotational symmetry. This type of light exit surface makes it possible to obtain a specific form of lighting pattern while obtaining a uniform light distribution.

Another object of the present invention is achieved by a lighting device having a lens of the above-mentioned type, which lighting device is able to generate a uniform light distribution.

According to a preferred design solution of the present invention, the light source of the lighting device is an LED light source, and the LED light source, as a green energy source, has the characteristics of long life and high light efficiency.

Description of drawings

The accompanying drawings constitute a part of this specification and are provided to help further understanding of the invention. The drawings illustrate embodiments of the invention and together with the description serve to explain the principles of the invention. The same components are denoted by the same reference numerals in the drawings. The figure shows:

Figure 1 is a cross-sectional view of a lens according to the present invention;

Fig. 2 is the light path diagram after the light of the light source passes through the lens according to the present invention;

Fig. 3 is a partially enlarged view of the light incident surface of the lens according to the present invention.

Detailed ways

Figure 1 shows a cross-sectional view of a lens according to the invention. It can be seen from the figure that the lens has a bottom surface 1 and a light exit surface 2 raised on the bottom surface 1 . A recessed area 3 is formed in the center of the bottom surface 1 . As can be seen from the figure, the recessed area 3 is designed to be similar to a cone, and the inner conical surface of the recessed area 3 forms a light incident surface 4 . The light source 5 (see FIG. 2 ) of the lighting device is arranged in the recessed area 3, and the recessed area 3 is rotationally symmetrical with respect to the optical axis X of the light source 5, wherein a plurality of annular grooves are provided on the light incident surface 4 4a, these annular grooves 4a refract the light from the light source 5 and then exit through the light exit surface 2 . Furthermore, the top 4b of the recessed area 3 is designed spherical. In the design solution of the present invention, the light source 5 is designed as an LED light source.

It can be further seen from FIG. 1 that the light exit surface 2 includes a concavely curved middle region 2a and a convexly curved edge region 2b, and the middle region 2a and the edge region 2b have a smooth transition, wherein the middle region 2a and the edge region 2b are respectively relative to the optical axis X-rotational symmetry.

Fig. 2 shows the light path diagram of the light from the light source 5 passing through the lens according to the present invention. It can be seen from the figure that the light is refracted by the light incident surface 1 and then exits through the light exit surface 2 . As a result, the distribution of the light from the light source 5 on the object to be irradiated is more uniform.

FIG. 3 shows a partially enlarged view of the light entrance face 4 of the lens according to the invention. It can be seen from the figure that the section of the annular groove 4 a on the plane passing through the optical axis X is a circular arc. The radius of this arc is between 0.1 and 0.5 mm. The arc-shaped profile of this size can better refract the light, so that the light distribution is more uniform.

The above are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

reference number

1 bottom surface

2 light exit surface

2a middle area

2b edge area

3 recessed area

4 Light incident surface

4a Annular groove

4b The top of the recessed area

5 light source

X-ray axis

Claims (8)

1. lens that are used for lighting device, the light-emitting face (2) that has bottom surface (1) and swell in described bottom surface (1), the central authorities of described bottom surface (1) form recessed region (3), the surface of described recessed region (3) forms light entrance face (4), the light source of described lighting device (5) is arranged in the described recessed region (3), and described recessed region (3) is with respect to optical axis (X) Rotational Symmetry of described light source (5), it is characterized in that, offer many annular ditch grooves (4a) on the described light entrance face (4), penetrate through described light-emitting face (2) after described annular ditch groove (4a) refraction from the light of described light source (5).

2. lens according to claim 1, it is characterized in that, described recessed region (3) is designed to similar conical, the inner conical surface of described recessed region (3) forms described light entrance face (4), many described annular ditch grooves (4a) are respectively formed on the plane perpendicular to described optical axis (X) of described recessed region (3), and arrange from bottom to the top (4b) of described recessed region (3) with being adjacent to each other.

3. lens according to claim 2 is characterized in that, the described top (4b) of described recessed region (3) is designed to sphere.

4. lens according to claim 2 is characterized in that, the cross section of described annular ditch groove (4a) on the plane of being passed by described optical axis (X) is circular arc.

5. lens according to claim 4 is characterized in that, the radius of described circular arc is between 0.1 to 0.5 millimeter.

6. each described lens in 5 according to claim 1, it is characterized in that, described light-emitting face (2) comprises the zone line (2a) of concave surface bended and the fringe region (2b) of convex bending, and described zone line (2a) seamlessly transits with described fringe region (2b), and wherein said zone line (2a) and described fringe region (2b) are respectively with respect to described optical axis (X) Rotational Symmetry.

7. a lighting device is characterized in that, described lighting device has according to claim 1 each described lens in 6.

8. lighting device according to claim 7 is characterized in that, the light source of described lighting device is led light source.

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