WO2019210709A1

WO2019210709A1 - Light fixture

Info

Publication number: WO2019210709A1
Application number: PCT/CN2019/071271
Authority: WO
Inventors: 杨毅
Original assignee: Yang Yi
Priority date: 2018-05-02
Filing date: 2019-01-11
Publication date: 2019-11-07
Also published as: CN208185913U

Abstract

Provided is a light fixture, comprising point light sources, at least two virtual image elements and a collimating element, wherein the virtual image elements collect a partial light emitted by the point light sources and projects same into an effective aperture of the collimating element, and the partial light forms virtual images of the point light sources on sides opposite to the virtual image elements relative to the collimating element, said collimating element being used for collimating light incident into the effective aperture thereof; color filters are located between the point light sources and an optical path of the collimating element, covering at least a part of an optical path of one virtual image and not covering at least a part of an optical path of another virtual image. The color filter filters a virtual image of one point light source into a certain color, and the color of another virtual image does not change; according to the foregoing manner, light beams of a plurality of colors will be formed, and then transverse a reflector array and form a plurality of mixed color light spots.

Description

Lamp

Technical field

The utility model relates to the field of illumination, in particular to the field of decorative lighting.

Background technique

Lamps belong to the traditional field, and a wide variety of lamps are available. When LEDs appear, the luminaires that use LEDs as the light source are also endless. However, with the improvement of people's living standards, there is an increasing demand for lighting, especially decorative lighting, and this demand has not yet been fully met.

Summary of the invention

A luminaire is provided, comprising a point source, at least two virtual image elements and a collimating element, wherein the virtual image element collects part of the light emitted by the point source and projects it into the effective aperture of the collimating element, and the part of the light is relative to the virtual image element Forming a virtual image of the point source on the opposite side of the collimating element, the collimating element is for collimating light incident into its effective aperture; a color filter between the point source and the optical path of the collimating element, covering a virtual image At least part of the optical path and not covering at least part of the optical path of the other virtual image.

The color filter filters the virtual image of one point source into a certain color, and the color of the other virtual image does not change, which forms a beam of multiple colors, thereby forming a plurality of mixed light spots through the mirror array.

DRAWINGS

1 is a schematic structural view of a lamp according to a first embodiment of the present invention;

2 is a schematic structural view of a lamp according to another embodiment of the present invention;

3a and 3b are views showing the structure of a lamp according to another embodiment of the present invention.

detailed description

The utility model provides a lamp, and the structure diagram thereof is shown in Fig. 1. The luminaire includes a point source 1101 (the illuminating point is S0, and thus also becomes the point source S0), at least two

virtual image elements

1102 and 1103, and a collimating element 1104. The

virtual image elements

1102 and 1103 are mirrors respectively collecting the

partial lights

1301 and 1303 emitted by the point source 1101 and projecting them into the effective aperture of the collimating element, respectively. According to the basic optical principle of the mirror, the portions of the

light

1301 and 1303 respectively form the virtual images S1 and S2 of the point source S0 at the opposite sides of the virtual image element (mirrors 1102 and 1103) with respect to the opposite sides of the collimating element 1104, and the collimating element is used for Collimate light incident into its effective aperture.

According to the optical principle, although there is only one point source S0, after the action of the

mirrors

1102 and 1103, three light sources are equivalent: the point source S0, the virtual source S1 and the virtual source S2, and the three sources have the same shape. The light from the three sources is simultaneously projected into the effective aperture of the collimating element and collimated to form three parallel beams.

In this embodiment, a mirror array 1105 is also included at the rear end of the optical path of the collimating element. Each sub-mirror in the mirror array emits a parallel light incident thereon to form a small spot, which is equivalent to a small spot. Then the image of the point source (imaged at infinity). Due to the use of the

mirrors

1102 and 1103, three point sources S0, S1 and S2 are equivalently present, then three parallel beams are incident on each sub-mirror, and after each sub-reflector is reflected The image of the three point sources will be formed, that is, three small spots. There are a plurality of sub-mirrors on the mirror array, and the small spots formed by each sub-mirror are projected in different directions; this will form a small spot of three times the number of sub-mirrors, thereby achieving a decorative effect.

In the present embodiment, a color filter between the point source 1101 and the light path of the collimating element 1104 is further included. In the present embodiment, the mirror 1102 itself is a reflective filter that is capable of reflecting light of a certain color spectrum while the remaining light is transmitted. For example, mirror 1102 can reflect red light and other light is transmitted. Then, the light emitted by the virtual light source S1 is filtered during the reflection process of the mirror 1102 to form red light, so that the small light spots obtained by the virtual light source S1 passing through the mirror array 1105 are all red. What is important is that when a filter is generally used to filter light on the optical path to form color light, which orientation is filtered will form the filter color at a particular orientation within the final spot range. For example, if the light above the filter is filtered, a red spot will be formed in the upper projection space, that is, the red spot cannot be distributed throughout the projection space. However, the effects of this embodiment are different. As mentioned above, there are a plurality of sub-mirrors on the mirror array, and the small spots formed by each sub-mirror are projected in different directions; that is, the image of the virtual light source is distributed by sub-mirrors reflected by a plurality of different directions. For the entire projection space. Then, in this embodiment, for example, the light of the virtual light source S1 is filtered by the mirror 1102 to become red, and the small light spot formed by the virtual light source S1 is red, and is distributed throughout the projection space. This makes it possible to form an effect of staggered distribution of dots of at least two colors, each of which is distributed throughout the projection space. In fact, in this embodiment, the color filter can also be attached to the mirror, and the effect is the same. It can be understood that to achieve the effect that the color points are distributed throughout the projection space, it is necessary to achieve the condition that the color filter covers at least part of the optical path of one virtual image and does not cover at least part of the optical path of the other virtual image. In this way, different virtual light sources will have different color representations; since the light spots corresponding to each virtual light source can be distributed throughout the projection space, the light spots represented by different colors will be scattered throughout the projection space.

In this embodiment, the virtual image element is a mirror that reflects and projects a portion of the light from the non-optical axis emitted by the point source S0 into the effective aperture of the collimating element. In fact, the virtual image element only needs to collect part of the light emitted by the point source and project it into the effective aperture of the collimating element, and the part of the light forms a virtual image of the point source on the opposite side of the virtual image element relative to the collimating element. The purpose of the utility model. Such virtual image elements have other options in addition to the mirrors of the above-described embodiments, as will be further explained in the following embodiments.

In the present embodiment, the point source S0 is an illuminant. For example, the point source S0 may be an LED chip or a laser source. Such a laser source includes a laser source and a fluorescent sheet, and the laser light emitted from the laser source is focused on the fluorescent sheet to cause it to emit fluorescence. Due to the high collimation characteristics of the laser, the focus point can be very small, so the illuminating area of the illuminating illuminator is small, and the proximity is a geometric point. The smaller the light-emitting area at this point, the higher the brightness of the projected light spot and the better the decorative effect. It is worth noting that the use of point sources in many places in this description does not refer to a point source with a perfect illumination area approaching zero, but a general term for a source of illumination area.

In addition to the real illuminant, the point source S0 can also be a virtual source, that is, a virtual image of a real source, which is an equivalent source of illumination. This does not affect the lighting effects described above. For example, a light source is located within the focus of a convex lens, and a light image is formed on the same side of the original light spot after passing through the convex lens. The virtual light source formed by the virtual image can be used as the point light source S0 in the embodiment of the present invention. For example, in the above laser light source, a convex lens may be further included, and the light-emitting point of the fluorescent sheet is located within the focus of the convex lens. This will form a virtual point source.

In the embodiment shown in Fig. 1, S0 acts as a real light-emitting point, and two virtual light-emitting points S1 and S2 are formed under the action of a mirror (virtual image element). However, the optical paths of the virtual light-emitting points S1 and S2 are the same (up and down symmetrical) and can be simultaneously located on the focal plane of the light collimating element. The optical path of the illuminating 1302 of S0 is obviously shorter than the illuminating optical path of S1 (this is because the optical path of S1 is reflected by the mirror 1102 and then reaches the optical collimating element. According to the triangle principle, the sum of the two side lengths is necessarily greater than the third side. ). Therefore, when S1 and S2 are located on the focal plane of the collimating element, S0 is necessarily located between the focal plane and the light collimating element, so that the beam 1302 emitted by the out-of-focus S0 is not perfectly collimated by the collimating element. The small spot formed by the mirror array will be too large.

In another embodiment of the present invention, for the direct illumination of the solid point source S0, another virtual image element is used to form another virtual illumination point, which solves this problem. A schematic structural view of this embodiment is shown in FIG. 2.

The difference between this embodiment and the embodiment shown in FIG. 1 is that, in the present embodiment, another virtual image element 2107 including a convex lens is used, wherein the convex lens 2107 is used to collect the light emission around the optical axis of the light-emitting point. At the same time, the mirror is used to collect the illuminating point away from the optical axis. The light beam emitted from the light-emitting point S0 is transmitted through the lens 2107 and then transmitted to the light collimating element. According to the optical path reversible principle, the equivalent virtual light-emitting point S0' is located on the side of the real light-emitting point S0 away from the light collimating element. With reasonable design, S0', S1 and S2 can be made to have the same optical path and are located on the focal plane of the light collimating element. In this way, it is possible to simultaneously ensure that the three beams of light pass through the light collimating element to achieve perfect collimation, further ensuring that the small spot is minimized and brightest.

In this embodiment, the virtual image element comprises two types, a mirror and a convex lens. In the present description, they are collectively referred to as virtual image elements for convenience of explanation.

Another difference from the embodiment described in FIG. 1 is that in the present embodiment, the color filter 2109 is located between the virtual image element (mirror) and the optical path of the collimating element, and the distance from the virtual image element is less than the distance. The distance of the straight element. Although the virtual image element is separated by a distance, the position of the color filter 2109 is still relatively close to the virtual image element. At this position, the optical paths corresponding to the virtual image elements do not intersect much, so the color filter can cover one of the optical paths. Without covering another light path. Such an arrangement of the present embodiment facilitates switching of the color filter as compared with the embodiment shown in FIG. The switching of the color filters means a change in color and a change in the decorative effect.

In the present embodiment, preferably, at least two of the

virtual image elements

2102 and 2103 are integrally formed to constitute a virtual image component. This virtual image component can be integrally molded by opening the mold, and then the mirror is placed inside the mold to form

virtual image elements

2102 and 2103. The color filter is placed at the back end of the virtual image component and placed near the virtual image component. This makes the assembly of two or more virtual image elements easier, and the color filter can be placed as close as possible to the virtual image element while maintaining the exchangeable characteristics.

Preferably, the virtual image component comprises at least four virtual image components, wherein one of the virtual image components is a convex lens for collecting part of the light source of the point source and the nearby light and projecting it into the effective aperture of the collimating element, and the other virtual image components are mirrors. For collecting part of the light around the optical axis of the point source and projecting it into the effective aperture of the collimating element. In this way, all of the virtual image components are integrated to form a virtual image component, which is most convenient for assembly.

In another embodiment, shown in Figure 3a, prism 3102 is used as a virtual image component. The mirror is reflective to direct the beam to the collimating element and form a virtual image, while the prism is transmissive to direct the beam to the collimating element and form a virtual image. In the embodiment of Fig. 3a, the light emitted from the light-emitting point S0 is divided into two parts in the up and down direction, the upper half 3301 is incident on the upper half of the prism 3102, and the lower half 3303 of the light is incident on the lower half of the prism 3102. . The two portions of light 3301 and 3303 are respectively refracted at different positions of the prism and respectively led to the light collimating element 3104, and are collimated by the light collimating element 3104 and reflected by the mirror array 3105 to form a plurality of small Spot. According to the optical path reversibility principle, the two portions of light 3301 and 3303 correspond to the virtual light-emitting points S1 and S2, respectively, so that a small spot twice the number of sub-mirrors on the mirror array can be realized.

In the present embodiment, the prism 3102 (virtual image component) includes two virtual image elements, one virtual image element is the upper half of the prism 3102, and the other virtual image element is the lower half of the prism. The two virtual image elements are integrally formed to form one Large prism. The illumination points of the two virtual image elements (ie, the upper and lower parts of the prism 3102) have the same illumination angle. Such a symmetrical design can ensure that the optical paths of the two portions are the same, so that two virtual light-emitting points can be designed. S1 and S2 are simultaneously located on the focal plane of the light collimating element.

In another example of this embodiment, a front view of the prism 3102 is shown in Figure 3b. It can be seen that the light collecting means is composed of three

light guiding members

3102a, 3102b and 3102c, each of which is a small prism which guides the light beams emitted from different directions to the light collimating elements. It can be understood that three virtual light-emitting points can be formed in this way, thereby finally achieving a small spot three times the number of sub-mirrors.

In this embodiment, the color filter 3109 is located between the point source and the virtual image element optical path, completely covering the optical path of one virtual image S1, and does not cover other optical paths at all. The area of the optical path here is small, and the area of the color filter used is also small, so the cost is low.

In the above description of the embodiment, the light collimating element is a convex lens, and the mirror arrays are all convex shapes. In fact, the light collimating element can also be a curved mirror, and the mirror array can also be a convex shape. Obviously, the light collimating element and the mirror array are not limited to the specific form as long as they can implement the functions defined by the present invention.

The above description is only an embodiment of the present invention, and thus does not limit the scope of the patent of the present invention, and the equivalent structure or equivalent flow transformation made by using the specification and the drawings of the present invention, or directly or indirectly applied to other The related technical fields are all included in the scope of patent protection of the present invention.

Claims

A luminaire characterized by comprising:

a point source, at least two virtual image elements, and a collimating element, wherein the virtual image element collects part of the light emitted by the point source and projects it into the effective aperture of the collimating element, and the difference of the part of the light in the virtual image element relative to the collimating element The side forms a virtual image of the point source, and the collimating element is used to collimate the light incident into its effective aperture;

A color filter between the point source and the optical path of the collimating element covers at least a portion of the optical path of one virtual image and does not cover at least a portion of the optical path of the other virtual image.
The luminaire of claim 1 including a mirror array at the rear end of the optical path of the collimating element.
The luminaire of claim 1 wherein the virtual image element comprises a mirror that reflects and projects a portion of the light from the non-optical axis emitted by the point source into the effective aperture of the collimating element.
The luminaire according to claim 3, wherein the color filter is attached to the mirror, or the mirror itself is a reflection type filter.
The luminaire according to claim 1, wherein the color filter is located between the point source and the optical path of the virtual image element, completely covering the optical path of a virtual image, and does not cover other optical paths at all.
The luminaire of claim 1 wherein the distance between the optical filter virtual image element and the optical path of the collimating element is less than the distance from the imaginary element.
The luminaire of claim 6 wherein the at least two virtual image elements are integrally formed to form a virtual image component; the color filter is located at the rear end of the optical path of the virtual image component and placed adjacent to the virtual image component.
The luminaire according to claim 7, wherein said virtual image component comprises at least four virtual image elements, wherein one of the virtual image elements is a convex lens for collecting a part of the light source of the point source and the nearby portion and projecting it to the collimation Within the effective aperture of the component, the other virtual image components are mirrors that collect a portion of the light around the optical axis of the point source and project it into the effective aperture of the collimating element.
The luminaire according to claim 1, wherein said point source comprises a laser source and a fluorescent sheet, and the laser light emitted from the laser source is focused on the fluorescent sheet to cause it to emit fluorescence.
The luminaire according to claim 9, wherein the point source further comprises a convex lens, and a light emitting point of the fluorescent sheet is located within a focus of the convex lens.