CN113701124A

CN113701124A - Optical system and lamp

Info

Publication number: CN113701124A
Application number: CN202010441624.2A
Authority: CN
Inventors: 张谦; 刘超博
Original assignee: Opple Lighting Co Ltd; Suzhou Op Lighting Co Ltd
Current assignee: Opple Lighting Co Ltd; Suzhou Op Lighting Co Ltd
Priority date: 2020-05-22
Filing date: 2020-05-22
Publication date: 2021-11-26

Abstract

The optical system of the present invention includes: a light source, which is a point light source; a collimating optical element; the second Fresnel lens is a cylindrical stretched Fresnel lens, and the light incident surface or the light emergent surface of the second Fresnel lens is a cylindrical array which is continuously arranged; the third Fresnel lens is a light splitting Fresnel lens, the light incident surface or the light emergent surface of the third Fresnel lens is a continuously-arranged regular triangular prism array, and the axis of each regular triangular prism is perpendicular to the axis of the cylindrical surface of the second Fresnel lens; and light emitted by the light source sequentially passes through the collimating optical element, the second Fresnel lens and the third Fresnel lens and then is emitted to form rainbow light spots. According to the optical system, the point light sources can form arc-shaped light spots through the combination of the collimating lens and the stretching lens, and the rainbow light spots formed by combining the light splitting lens have good light emitting effect. And meanwhile, the multilayer Fresnel lens is adopted, so that the whole optical system is thinner, thinner and smaller.

Description

Optical system and lamp

Technical Field

The present invention relates to an optical system, and more particularly to an optical system for a lamp, which can form a color illumination effect, and a related lamp.

Background

Along with the improvement of the life quality of people, the appreciation level of the illumination effect is gradually improved, and the color light-emitting effect is often used as decoration and other application occasions in the field of decorative lamps. Such as bridges, building exterior walls, curtain walls and the like. Rainbow, an optical phenomenon in meteorology, is that when sunlight strikes a water drop in the sky, the light is refracted and reflected, forming a colorful spectrum (from outside to inside) in an arch shape on the sky: red, orange, yellow, green, cyan, blue, violet. Because of the beauty of rainbow and the rare natural appearance, people always think that rainbow is a beautiful and happy symbol, and therefore the lighting lamp capable of forming rainbow light spot effect is also popular among the public.

Rainbow lamps in the market are generally produced by splicing or projecting RGBW multicolor light sources, and the control and structure system is complicated and high in cost. Some lamps are provided with rainbow light spots formed by combining a white light source with a common prism, but the lamps are provided with block-shaped triangular pyramids, only light beams can be split, a curved and slender rainbow form cannot be formed, the distance between the lamps and a light source is considered, and the size of a strip-shaped light source is considered, so that the whole size of the lamp is large, and the lamps and lanterns cannot be suitable for various lighting scenes.

Disclosure of Invention

An object of the present invention is to solve at least one of the above problems and to provide a miniaturized optical system capable of forming rainbow spots, and a lighting fixture having the optical system.

In order to achieve the above-described functions, the present invention provides an optical system, including:

a light source, which is a point light source;

a collimating optical element;

the second Fresnel lens is a cylindrical stretched Fresnel lens, and the light incident surface or the light emergent surface of the second Fresnel lens is a cylindrical array which is continuously arranged;

the third Fresnel lens is a light splitting Fresnel lens, the light incident surface or the light emergent surface of the third Fresnel lens is a continuously-arranged regular triangular prism array, and the axis of each regular triangular prism is perpendicular to the axis of the cylindrical surface of the second Fresnel lens;

and light emitted by the light source sequentially passes through the collimating optical element, the second Fresnel lens and the third Fresnel lens and then is emitted to form rainbow light spots.

Further, the collimating optical element is a first fresnel lens.

Further, the first Fresnel lens and the second Fresnel lens are arranged in parallel.

Furthermore, the cylindrical surface of the second fresnel lens is a cylindrical surface, and the center of the circular arc of the second fresnel lens is located on one side close to the light source.

Further, the regular triangular prisms arranged in the array are arranged on the light incident surface of the third Fresnel lens, the second Fresnel lens is perpendicular to the light source optical axis, the third Fresnel lens is obliquely arranged relative to the second Fresnel lens, and the inclination angle is 15-25 degrees.

Further, the inclination angle is 20 °.

Further, the third fresnel lens is a wedge-shaped plate with gradually changed thickness.

Furthermore, the thickness of the third Fresnel lens is gradually increased from the side close to the light source to the side far away from the light source, the angle of the thickness change is more than or equal to 0 degree and less than or equal to 3 degrees, and the rainbow light spots are shortened and thickened along with the increase of the angle.

Furthermore, the thickness of the third Fresnel lens is gradually increased from the side far away from the light source to the side close to the light source, the angle beta of the thickness change is more than or equal to 0 degree and less than or equal to 8 degrees, and the rainbow light spots become longer and thinner along with the increase of the angle.

Furthermore, the optical system further comprises a reflecting cover, the reflecting cover comprises a light inlet, a light outlet and a reflecting wall connected with the light outlet and the light inlet, the light source is arranged on one side of the light inlet of the reflecting cover, and the second Fresnel lens is arranged on the outer side of the light outlet of the reflecting cover.

Further, the aperture of the light outlet of the reflector is smaller than the aperture of the light inlet.

Further, the reflector is hemispherical.

The application also provides a lamp, its characterized in that: the lamp comprises the optical system.

According to the optical system provided by the invention, the point light source can form arc-shaped light spots through the combination of the collimating lens and the stretching lens, and the rainbow light spots formed by combining the collimating lens and the stretching lens have good light emitting effect. And meanwhile, the multilayer Fresnel lens is adopted, so that the whole optical system is thinner, thinner and smaller. The design of the gradual change of the thickness of the light splitting lens can easily realize various effects of different lengths and thicknesses.

Drawings

FIG. 1 is a schematic diagram of the structure of a preferred embodiment of the optical system of the present invention;

FIG. 2 is a front view of the preferred embodiment of FIG. 1;

FIG. 3 is a side view of the preferred embodiment of FIG. 1;

FIG. 4 is a light path diagram of the preferred embodiment of FIG. 1;

FIG. 5 is a schematic diagram of a modified design of a third Fresnel lens in a preferred embodiment of the optical system of the present invention;

FIG. 6 is a schematic diagram of an alternative design variation of the third Fresnel lens in the preferred embodiment of the optical system of the present invention;

fig. 7 is a second fresnel lens in another preferred embodiment of the optical system of the invention.

Detailed Description

The optical system for a lamp according to the present invention is further described in detail with reference to the accompanying drawings and the specific embodiments.

Several individual sections are mounted on a frame to create a lighter and thinner lens, assuming that the refractive power of a lens occurs only at the optical surface (e.g., lens surface), removing as much optical material as possible while preserving the curvature of the surface.

As shown in fig. 1, 2, and 3, an optical system according to a preferred embodiment of the present application includes a light source 1, a reflector 2, a first fresnel lens 3, a second fresnel lens 4, and a third fresnel lens 5. The light source 1 is a point light source, and in this embodiment, an LED is used as the light source, and the LED may refer to a packaged LED, an unpackaged LED, a surface mount LED, a chip-on-board LED, or an LED including some type of optical element. Of course, the light source is a point light source and is not limited to a single LED, and the light source may also include a plurality of LED chips with the same or different light colors, which is not limited in this application. The first fresnel lens 3 is a quasi-straight fresnel lens, which is a revolution body structure with a toothed section, and the surface of the first fresnel lens is composed of a series of sawtooth-shaped grooves when viewed from the section. The optical axis of the first fresnel lens 3 coincides with the optical axis of the light source 1. The first fresnel lens 3 mainly converts the light emitted from the light source 1 into parallel light beams, so that the front half of the whole optical system forms a collimated light source. The fresnel lens used for collimation can be designed according to a collimation angle as required, the specific design method is not described in detail in the application, and the collimation angle reaches 3 degrees in the embodiment. In other preferred embodiments, other collimating optical elements may be used in combination with the light source 1 to form a collimated light source, such as a convex lens or a TIR lens, which is not limited in this application.

The second fresnel lens 5 is a cylindrical stretched fresnel lens, and is composed of stretched bodies of semi-arc stripes, the optical surface of the second fresnel lens is a cylindrical surface array which is continuously arranged, and the center of the arc of the second fresnel lens is positioned at one side close to the light source 1. The optical surface of the second fresnel lens 5 may be a light incident surface as shown in fig. 7 or a light emergent surface as shown in fig. 2. In the embodiment of fig. 2, the optical surface is disposed on the light-emitting surface of the second fresnel lens 5, so that the first fresnel lens 4 and the second fresnel lens 5 can be bonded in an actual product, and the whole optical system has a more compact structure and a smaller volume. Even in the case of non-contact, in order to ensure a good optical effect, the first fresnel lens 4 and the second fresnel lens 5 need to be arranged in parallel so that their optical axes can be perpendicular to the same plane. The second fresnel lens 5 is used for stretching the collimated light spots generated by the first fresnel lens 4 into a line, so that the formed linear light spots are used as the incident light of the subsequent lens. It is of course also possible to use a linear light source directly, but the beam length of the linear light source is related to the length of the lamp body, and the volume of the linear light source is significantly larger than the optical system proposed in the present application using a point light source.

The third fresnel lens 6 is a light splitting fresnel lens, and plays a light splitting role in the optical system of the present application. The light incident surface or the light emergent surface is a regular triangular prism array which is continuously arranged, namely the third Fresnel lens 6 is formed by stretching a continuous regular triangular tooth-shaped section. The stretching direction of the third fresnel lens 6 and the stretching direction of the second fresnel lens 5 are perpendicular to each other, that is, the axis of the regular triangular prism in the third fresnel lens 6 and the axis of the cylindrical surface in the second fresnel lens 5 are perpendicular to each other, so that the light spot formed by the linear light beam emitted from the second fresnel lens 5 on the incident working surface of the triangular prism is parallel to the ridge line of the regular triangular prism. In this embodiment, the regular triangular prism array is disposed on the light incident surface of the third fresnel lens 6, that is, the side facing the second fresnel lens 5, and due to the dispersion characteristic of the triangular prisms, the third fresnel lens 6 and the second fresnel lens 5 are not disposed in parallel, but are disposed in an inclined manner to form an included angle θ as shown in fig. 4, where the value range of θ is 15-25 °. In this embodiment, θ is equal to 20 °, and the simulated rainbow effect is the best without generating white stray light. So far, the light emitted by the light source 1 is sequentially collimated by the second fresnel lens 4, stretched by the second fresnel lens 5, and dispersed by the third fresnel lens 6, and then is emitted to form a perfect rainbow light spot.

In this embodiment, the third fresnel lens 6 is a flat plate, but in other preferred embodiments, the third fresnel lens 6 may be a wedge-shaped plate with gradually changing thickness, and forms different rainbow light spot effects. Fig. 5 shows a modified design of the third fresnel lens 6, and as shown in the figure, the upper part of the thickness of the third fresnel lens 6 is thicker and the lower part of the thickness is narrower, and since the third fresnel lens 6 is obliquely arranged, we can say that the thickness is gradually increased from the side close to the light source to the side far away from the light source, the angle of the thickness change is 0 degrees or more and less than or equal to alpha and less than or equal to 3 degrees, and the rainbow spots formed are gradually shortened and thickened along with the increase of the alpha angle. In another modified design of the third fresnel lens 6 shown in fig. 6, the third fresnel lens 6 has a thicker lower portion and a narrower upper portion, i.e., the thickness of the third fresnel lens 6 gradually increases from the side away from the light source to the side close to the light source, the angle of the thickness change is 0 ° β 8 ° or less, and the rainbow spots become longer and thinner as the angle β increases.

In the preferred embodiment of the present application,

the preferred embodiment of the present application shown in fig. 1 further includes a reflective cover 2, but in other preferred embodiments, the reflective cover 2 is not necessary, and the reflective cover 2 in this embodiment is for improving the utilization rate of the light source. The reflector 2 comprises a light inlet, a light outlet and a reflecting wall connecting the light outlet and the light inlet, the reflector 2 in the embodiment adopts a special design, the whole reflector is close to an inverted bowl and is a hemisphere with the top cut off, and the aperture of the light outlet is smaller than that of the light inlet. The light source 1 is arranged on one side of a light inlet of the reflector 2, and a light outlet of the reflector 2 faces the first Fresnel lens 4, and then the second Fresnel lens 5 and the third Fresnel lens 6 are arranged. The combination of the special brightness enhancement reflector and the Fresnel lens can ensure that the utilization rate of the light source is more than twice of that of the common Fresnel lens, and specifically can be 2.2 times. In another preferred embodiment of the present application, a conventional reflector structure may also be adopted, and a TIR lens covering the light source 1 is disposed on the light inlet side of the reflector to realize the collimation of the light source 1, in this case, the first fresnel lens 4 is not needed, and the second fresnel lens 5 is disposed outside the light outlet of the reflector 2.

The optical system can be used for lamps, the optical system in the embodiment can be matched with a proper shell and a driving power supply to be made into a rainbow light spot lamp specially used for a color lighting effect, the rainbow light spot lamp is applied to scenes such as indoor scenes, building outer walls, bridges and curtain walls, and the length and the width of a rainbow can be adjusted by changing the structure of the third Fresnel lens 6. In other preferred embodiments, the optical system of the present application can be added to a conventional lighting fixture, such as a ceiling lamp or a wall lamp, as an auxiliary lighting to form a special lighting effect other than a main lighting.

The foregoing description of the preferred embodiments of the present invention has been presented for purposes of illustration and description and is not intended to be exhaustive or to limit the invention to the precise form disclosed, and it will be apparent that numerous modifications and variations may be made thereto, which will be apparent to those skilled in the art, and are intended to be included within the scope of the invention as defined by the following claims.

Claims

1. An optical system, comprising:

a light source, which is a point light source;

a collimating optical element;

2. A polarized light fixture as recited in claim 1, wherein: the collimating optical element is a first Fresnel lens.

3. The optical system of claim 2, wherein: the first Fresnel lens and the second Fresnel lens are arranged in parallel.

4. A polarized light fixture as recited in claim 1, wherein: the cylindrical surface of the second Fresnel lens is a cylindrical surface, and the circle center of the circular arc of the second Fresnel lens is positioned at one side close to the light source.

5. The optical system of claim 1, wherein: regular triangular prisms arranged in an array are arranged on the light incident surface of the third Fresnel lens, the second Fresnel lens is perpendicular to the light source optical axis, the third Fresnel lens is obliquely arranged relative to the second Fresnel lens, and the inclination angle is 15-25 degrees.

6. The optical system of claim 5, wherein: the inclination angle is 20 °.

7. The optical system of claim 5, wherein: the third Fresnel lens is a wedge-shaped plate with gradually changed thickness.

8. The optical system of claim 7, wherein: the thickness of the third Fresnel lens is gradually thickened from the side close to the light source to the side far away from the light source, the angle of the thickness change is more than or equal to 0 degree and less than or equal to 3 degrees, and the rainbow light spots are shortened and thickened along with the increase of the angle.

9. The optical system of claim 7, wherein: the thickness of the third Fresnel lens is gradually increased from the side far away from the light source to the side close to the light source, the angle beta of the thickness change is more than or equal to 0 degree and less than or equal to 8 degrees, and the rainbow light spots become longer and thinner along with the increase of the angle.

10. The optical system of claim 1, wherein: the optical system further comprises a reflecting cover, the reflecting cover comprises a light inlet, a light outlet and a reflecting wall connected with the light outlet and the light inlet, the light source is arranged on one side of the light inlet of the reflecting cover, and the second Fresnel lens is arranged on the outer side of the light outlet of the reflecting cover.

11. The optical system of claim 10, wherein: the aperture of the light outlet of the reflector is smaller than that of the light inlet.

12. The optical system of claim 11, wherein: the reflector is hemispherical.

13. A light fixture, characterized by: the luminaire comprising the optical system of any one of claims 1-12.