CN108826230A - Flashlight lens and lighting device - Google Patents

Abstract

The invention discloses a kind of flashlight lens and lighting device, the optical lens includes lens body, and the lens body includes：Bottom surface, top surface and side；Bottom surface, the bottom surface are equipped with into optical cavity, it is described enter optical cavity surface be refraction incidence surface；The top surface is refraction light-emitting surface；Between the bottom surface and top surface, the side is reflective surface for the side, and the side is used to entering the incidence surface into the reflection of the light in the lens body, and the light and the light-emitting surface after making reflection are projected at plumbness, and from the light-emitting surface.The flashlight lens realize limit central light strength, and spot area does not have aperture, and hot spot is uniform, while improving light conversion ratio to greatest extent, reduce light loss, the light source setting structure is simple, and production cost is low.

Description

Flashlight lens and lighting device

technical field

The invention relates to the technical field of optical lenses, in particular to a flashlight lens and an illuminating device.

Background technique

Most of the flashlights use high-power light-emitting diodes as light sources. High-power light-emitting diodes are point light sources that emit light in a directional way. Optical lenses are required to achieve the ultimate central light intensity, while maximizing the light source conversion rate and reducing light loss. .

In the prior art, most reflectors are used to reflect light from the light source to achieve light distribution, but when the reflector is used, a sub-aperture will appear in the lighting area, giving people a bad visual effect.

Contents of the invention

The present invention aims to solve one of the technical problems in the related art at least to a certain extent. To this end, an object of the present invention is to propose a flashlight lens.

On the one hand, in order to achieve the above purpose, an embodiment of the present invention provides a flashlight lens, and the flashlight lens includes:

A bottom surface, the bottom surface is provided with a light incident cavity, and the surface of the light incident cavity is a refraction light incident surface;

a top surface, the top surface is a light-refracting surface;

The side, the side is located between the bottom surface and the top surface, the side is a reflective surface, and the side is used for total reflection of the light entering the lens body from the incident surface, so that the total reflection The light is perpendicular to the light-emitting surface and exits from the light-emitting surface.

According to an embodiment of the present invention, the top surface is a plane.

According to an embodiment of the present invention, the light entrance cavity is a rotating body in the shape of a "chevron".

According to an embodiment of the present invention, the generatrix of the rotating body of the light entrance cavity is an arc whose slope gradually increases from the bottom surface to the top surface.

According to an embodiment of the present invention, the lens body is formed by injection molding of optical grade polycarbonate or optical grade polymethyl methacrylate.

In the flashlight lens provided by the example of the present invention, the light emitted by the light source is introduced into the lens body through the bottom surface, and the light entering the lens body from the light incident surface is totally reflected through the side surface, so that the total The reflected light is perpendicular to the light-emitting surface and exits from the light-emitting surface. In order to achieve the extreme center light intensity, there is no aperture in the spot area, and the spot is uniform, while maximizing the conversion rate of the light source and reducing the loss of light efficiency.

On the other hand, the present invention also provides a lighting device, comprising:

the aforementioned flashlight lens;

A light source, the light source is arranged on the plane where the bottom surface is located, and the center point of the light source is located at the axis of the rotating body of the light entrance cavity;

a heat-conducting substrate, the light source is arranged on the heat-conducting substrate;

A heat conduction base, the heat conduction substrate is installed in the heat conduction base.

According to an embodiment of the present invention, the light source is a single light source, and the single light source is a point light source or a circular surface light source.

In the light source arrangement provided by the example of the present invention, the light emitted by the light source is introduced into the lens main body through the bottom surface of the above-mentioned flashlight lens, and the light entering the lens main body from the light-incident surface is completely passed through the side surface. Reflection, making the totally reflected light perpendicular to the light-emitting surface and exiting from the light-emitting surface. In this way, the extreme central light intensity is realized, the light spot area has no aperture, the light spot is uniform, and at the same time, the conversion rate of the light source is maximized, and the loss of light efficiency is reduced. The light source setting structure is simple and the production cost is low.

Description of drawings

Fig. 1 is the schematic diagram of the perspective structure of the flashlight lens provided by the embodiment of the present invention;

Fig. 2 is the schematic diagram of the sectional structure of the flashlight lens provided by the embodiment of the present invention;

Fig. 3 is the structural schematic view looking up from the bottom surface of the flashlight lens provided by the embodiment of the present invention;

Fig. 4 is another sectional structural schematic diagram of the flashlight lens provided by the embodiment of the present invention;

Fig. 5 is a schematic structural diagram of an illuminating device provided by an embodiment of the present invention.

Reference signs:

lens body 10;

Top surface (light-emitting surface) 101;

Side (reflective surface) 102;

bottom surface 103;

Light entering cavity 1031;

Light incident surface 10311;

light source 20;

Thermally conductive substrate 30;

The heat conduction base 40.

The realization of the purpose of the present invention, functional characteristics and advantages will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

Detailed ways

In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field of the invention. The terms used herein in the description of the present invention are for the purpose of describing specific embodiments only, and are not intended to limit the present invention.

Reference herein to an "embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present invention. The occurrences of this phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is understood explicitly and implicitly by those skilled in the art that the embodiments described herein can be combined with other embodiments.

On the one hand, the embodiment of the present invention provides a flashlight lens. Referring to FIGS. A light incident cavity 1031 is provided on the top, and the surface of the light incident cavity 1031 is a refracting light incident surface 10311; The light source 20 is arranged in the light incident cavity 1031 , and the center point of the light source 20 is placed in the plane where the bottom surface 103 is located. The light La emitted by the light source 20 enters the lens body 10 from the light incident surface 10311 . Since the light source 20 is disposed in the light incident cavity 1031 , the light emitted from the light source 20 to the surroundings all enters the lens body 10 from the light incident surface 10311 .

The top surface 101 is a refracting light-emitting surface 101 ; the light-emitting surface 101 is used to emit light entering the lens body 10 to illuminate the front of the light-emitting surface 101 .

The side surface 102 is located between the bottom surface 103 and the top surface 101, the side surface 102 is a reflective surface 102, and the side surface 102 is used to totally reflect the light entering the lens body 10 from the light incident surface 10311 , making the totally reflected light perpendicular to the light-emitting surface 101 and emitting from the light-emitting surface 101 . Continuing to refer to FIG. 4 , the light La emitted by the light source 20 is refracted from the incident surface 10311 and then the refracted light Lb enters the lens body 10 , the side surface 102 of the lens body 10 is a reflective surface 102 , and the full The reflective surface performs total reflection on the refracted and refracted light Lb, and reflects it into a total reflection light Lc. The direction of the total reflection light Lc is perpendicular to the direction of the light exit surface 101, and the direction perpendicular to the light exit surface 101 becomes The light ray Ld is emitted.

In one embodiment of the present invention, a light emitting diode can be used as the light source 20 . It should be noted that the orientations such as "top", "bottom" and "side" refer to the relative positions of each surface, and are not the same as the specific setting positions of each surface in the actual application of the flashlight lens.

Continuing to refer to FIG. 1 , FIG. 2 and FIG. 4 , the top surface 101 is a plane. Since the top surface 101 is a plane, all outgoing light rays Ld are emitted in a direction perpendicular to the top surface 101 , so that all output light rays meet parallel emission requirements, thereby better illuminating the front.

In the flashlight lens provided by the example of the present invention, the light emitted by the light source 20 is introduced into the lens main body 10 through the bottom surface 103, and the light incident surface 10311 is introduced into the lens main body 10 through the side surface 102. The light is totally reflected, and the totally reflected light is perpendicular to the light-emitting surface 101 and emitted from the light-emitting surface 101 . In this way, the extreme center light intensity can be realized, there is no aperture in the spot area, and the spot is uniform, and at the same time, the conversion rate of the light source 20 can be maximized to reduce the loss of light efficiency.

Continuing to refer to FIG. 1 , FIG. 2 and FIG. 4 , the light entrance cavity 1031 is a rotating body in the shape of a "chevron". Through the rotator, the incident angle a of the light La emitted by the light source 20 on the same plane (XY plane) is consistent, so that the totally reflected light Lc (emitted light Ld) on the light exit surface 101 is 101 pairs of center points are axisymmetrically injected.

The light incident cavity 1031 is in the shape of a "herringbone", so that the light La in all directions emitted by the light source 20 can enter the lens body 10 from the light incident surface 10311, and pass through the The reflective surface 102 is totally reflected and emitted from the light emitting surface 101 to reduce loss of light efficiency.

Continuing to refer to FIG. 4 , the generatrix of the revolving body of the light incident cavity 1031 is an arc whose slope gradually increases from the bottom surface 103 to the top surface 101 . Since the slope of the generatrix gradually increases from the bottom surface 103 to the top surface 101, the angle between the light source 20 and the plane where the bottom surface is located is relatively reduced after the light in the Z-axis direction is farther away from the light source 20, thereby reducing the The thickness H of the lens body 10 is described above. Continuing to refer to FIG. 4, since the light La2 emitted by the light source 20 is closer to the top surface 101, the refracted light Lb2 that enters the lens body 10 after being refracted is farther away from the bottom surface 103, and can be reflected as reflected light. Lc2, when the slope of the arc is large, the angle between the refracted light Lb2 and the horizontal direction is relatively reduced, so that the reflection of the light Lb2 can also be satisfied when the thickness H of the lens body 10 is small.

More specifically, referring to FIG. 4 , the light incident cavity 1031 is concave, and a refracting light incident surface 10311 is formed inside. The light-refracting surface 10311 is connected to the bottom surface 103, and the light-refracting surface 10311 is an inner arc surface. Since the refracted light incident surface 10311 is an inner arc, the incident angle is large, and the angle between the refracted light and the horizontal is small. The light incident cavity 1031 forms a "herringbone inner arc" refracting light incident surface 10311 on the bottom surface 103, the light source 20 is arranged at the center of the opening of the bottom surface 103 of the light incident cavity 1031, and the light reflected by the light source 20 passes through the The light incident surface 10311 refracts the light incident surface 10311 and enters into the lens body 10 . The thickness of the lens body 10 can be determined by forming an opening in the shape of a "herringbone" on the bottom surface 103. The more vertical the shape of the "herringbone" inner arc, the thinner the thickness of the lens body 10; The curvature of each section of the inner arc shape controls the uniformity of the spot.

In this embodiment, the center of the opening of the bottom surface 103 of the light incident cavity 1031 coincides with the center of the bottom surface 103 , and the light emitting diode is arranged at the center of the plane where the bottom surface 103 is located. The light source 20 is a luminous light source 20 with a certain volume. In this embodiment, the LEDs can be regarded as point light sources 20 .

In an embodiment of the present invention, the lens body 10 is formed by injection molding of optical grade polycarbonate (PC) or optical grade polymethyl methacrylate (PMMA). By using optical-grade polycarbonate (PC) or optical-grade polymethyl methacrylate (PMMA), the lens has better light transmission and reduces light loss.

On the other hand, the present invention also provides a lighting device, including: the above-mentioned flashlight lens, light source 20, heat conduction substrate 30 and heat conduction base 40; The center point is located at the axis of the light incident cavity 1031; by setting the center point of the light source 20 at the axis of the light incident cavity 1031, the light La emitted by the light source 20 can be uniform Symmetrically enters the lens from the light incident surface 10311, and uniformly exits from the light exit surface 101 after refraction and total reflection.

The light source 20 is disposed on the heat-conducting substrate 30 ; the heat-conducting substrate 30 is used to install the light source 20 on the one hand, and conducts heat to the light source 20 on the other hand.

The heat conduction substrate 30 is installed in the heat conduction base 40 . The heat conduction substrate 30 conducts the heat emitted by the light source 20 , and can conduct the heat to the heat conduction base 40 , so as to dissipate the heat emitted by the light source 20 .

In an embodiment of the present invention, the light source 20 is a single light source 20 , and the single light source 20 is a point light source 20 or a circular surface light source 20 . The light source 20 is a point light source 20 or a circular surface light source 20 which emits relatively uniform and symmetrical light. This makes the light emitted by the flashlight lens more uniform and symmetrical.

The light source 20 provided by the example of the present invention is set to introduce the light emitted by the light source 20 into the lens body 10 through the bottom surface 103 on the flashlight lens, and enter the light incident surface 10311 into the lens body 10 through the side surface 102. The light in the lens body 10 is totally reflected, and the totally reflected light is perpendicular to the light-emitting surface 101 , and is emitted from the light-emitting surface 101 . In this way, the extreme center light intensity is realized, the light spot area has no aperture, the light spot is uniform, and at the same time, the conversion rate of the light 20 is maximized, and the light loss is reduced. The light source 20 has a simple structure and low production cost.

The above are only embodiments of the present invention, but do not limit the patent scope of the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, it can still carry out the above-mentioned each Modifications to the technical solutions described in the method, or equivalent replacement of some of the technical features. All equivalent structures made by utilizing the contents of the specification and drawings of the present invention and directly or indirectly used in other related technical fields are also within the protection scope of the patent of the present invention.

In the description of this specification, descriptions with reference to the terms "one embodiment", "some embodiments", "example", "specific examples", or "some examples" mean that specific features described in connection with the embodiment or example , structure, material or characteristic is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be construed as limitations to the present invention. Variations, modifications, substitutions, and modifications to the above-described embodiments are possible within the scope of the present invention.

Claims (7)

1. a kind of flashlight lens, including lens body, which is characterized in that the lens body includes：

Bottom surface, the bottom surface are equipped with into optical cavity, it is described enter optical cavity surface be refraction incidence surface；

Top surface, the top surface are refraction light-emitting surface；

Side, the side between the bottom surface and top surface, the side be reflective surface, the side be used for by it is described enter Smooth surface enters the total reflection of the light in the lens body, the light and the light-emitting surface after making total reflection at plumbness, And it is projected from the light-emitting surface.

2. flashlight lens according to claim 1, which is characterized in that the top surface is a flat surface.

3. flashlight lens according to claim 1, which is characterized in that it is described enter optical cavity be " people " glyph shape return Swivel.

4. flashlight lens according to claim 3, which is characterized in that it is described enter optical cavity revolving body bus be a slope The camber line being gradually increased from the bottom surface to top surface direction.

5. flashlight lens according to claim 1, which is characterized in that the lens body uses polycarbonate pc Or it optical-grade polymethylmethacrylacontinuous is molded.

6. a kind of lighting device, it is characterised in that：Including：

Flashlight lens described in claim 1 to 5 any one；

Light source, the light source setting is in plane where the bottom surface, and light source center point enters optical cavity revolving body described in Axis position；

Heat-conducting substrate, the light source setting are mounted on the heat-conducting substrate described；

Heat conducting base, the heat-conducting substrate are mounted in the heat conducting base.

7. lighting device according to claim 6, it is characterised in that：The light source is single light source, and the single light source is Point light source or round area source.