Lighting

Abstract

A lamp is proposed, comprising a light source, including at least one light-emitting point; a light-collecting device located between the light source and the light path of a collimating optical element, the light-collecting device comprising at least two light guides for respectively collecting light beams emitted from the light-emitting point of the light source at different angles, and respectively guiding the collected light beams to the collimating optical element in a manner of reflection or refraction, and forming parallel light after being collimated by the collimating optical element; and also comprising a reflector array for reflecting the parallel light to form a reflection light spot array. Through the light guide of the light-collecting device, at least two beams of light at different angles emitted from the light-emitting point can be projected to the collimating optical element and respectively form parallel light beams, which is equivalent to the light-emitting point becoming at least two equivalent virtual light-emitting points, and then the number of small light spots formed after reflection by the reflector array is at least doubled, which can enhance the decorative effect.

Description

Technical Field

[0001] The present invention relates to the field of lighting, in particular to the field of decorative lighting. Background Art

[0002] Lamps belong to the traditional field, and there are many kinds of lamps. When LEDs appeared, lamps with LED as light source also emerged in an endless stream. However, with the improvement of people's living standards, there is an increasing demand for lighting, especially decorative lighting, which has not been fully met yet. Summary of the invention

[0003] The present invention proposes a lamp, comprising a light source, comprising at least one light-emitting point, the light-emitting point having a full angle of A; a collimating optical element, the focal point of the collimating optical element being at a distance F from the element plane, and the effective aperture of the collimating optical element being D; the collimating optical element being used to collimate an incident light beam with a full angle of B emitted from a focal position into parallel light, wherein B=2*arctg(D / 2F), and B is less than A / 2; a light collecting device located between the light source and the light path of the collimating optical element, the light collecting device comprising at least two light guides, for respectively collecting light beams emitted from the light source light point at different angles, and respectively guiding the collected light beams to the collimating optical element in a manner of reflection or refraction, and forming parallel light after being collimated by the collimating optical element; and also comprising a reflector array, for reflecting the parallel light to form a reflection light spot array.

[0004] The light collection angle of the collimating optical element is B, which is less than half of the light emitting angle of the light emitting point. In this way, through the light guide of the light collecting device, at least two beams of light at different angles emitted by the light emitting point can be projected onto the collimating optical element and form parallel light beams respectively. This is equivalent to the light emitting point becoming at least two equivalent virtual light emitting points. Then the number of small light spots formed after reflection by the reflector array is at least doubled, which can enhance the decorative effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0005] Figure 1 A schematic diagram showing the structure of a lamp according to a first embodiment of the present invention;

[0006] Figure 2 A schematic diagram showing the structure of a lamp according to another embodiment of the present invention;

[0007] Figure 3a , 3b FIG. 1 is a schematic structural diagram of a lamp according to another embodiment of the present invention. DETAILED DESCRIPTION

[0008] The present invention provides a lamp, the structural schematic diagram of the first embodiment of which is shown in FIG. Figure 1As shown. The lamp includes a light source 1101, which includes at least one light-emitting point S0, and the full-light angle of the light-emitting point S0 is A, and A is greater than 60 degrees. It also includes a collimating optical element 1104, the focal point of the collimating optical element is at a distance F from the element plane, and the effective aperture of the collimating optical element is D; the collimating optical element is used to collimate the incident light beam with a full-light angle of B emitted from the focal position into parallel light, wherein B = 2*arctg(D / 2F). According to optical knowledge, B is the full-light collection angle of the collimating optical element, that is, the opening angle of the element facing the focus. The full-light collection angle B is less than half A / 2 of the full-light angle of the light-emitting point S0.

[0009] The lamp also includes a light collecting device located between the light source 1101 and the collimating optical element 1104. The light collecting device includes at least two light guides 1102 and 1103, which are used to collect light beams 1301 and 1303 emitted from the light source at different angles, and guide the collected light beams to the collimating optical element 1104 in a reflection manner, and form parallel light after being collimated by the collimating optical element. It also includes a reflector array 1105, which is used to reflect the parallel light to form a reflection spot array.

[0010] In order to clearly explain the working principle of the present invention, first consider the situation after a beam of parallel light is incident on the reflector array. Each sub-reflector on the reflector array can reflect a part of the parallel light incident thereon and form a small beam, and this small beam can form a small light spot on the far-field screen. This small light spot is the image formed by the light source after passing through the collimating optical element and the sub-reflector. It can be understood that as many small light spots as there are sub-reflectors, the effect will be better. However, it can be understood that the more sub-reflectors there are, the more small light spots there are, but the more sub-reflectors there are, the smaller the sub-reflectors are, so the energy projected on them is also less, which reduces the brightness of the small light spots. Moreover, in practice, the size of the sub-reflectors is limited by cutting and assembly and cannot be very small. In other words, using the method of increasing the number of sub-reflectors to increase the number of small light spots is contrary to the brightness performance of the small light spots. Therefore, it is hoped to find a method that can increase the number of small light spots without increasing the number of sub-reflectors. The present invention has just proposed such method.

[0011] In this embodiment, the light guide is a reflector. Figure 1Two reflectors (light guides) 1102 and 1103 are drawn in the figure. The upward light beam 1301 emitted by the light source S0 is reflected by the reflector 1102 and guided to the light collimating element 1104, and the downward light beam 1303 emitted by the light source S0 is reflected by the reflector 1103 and guided to the light collimating element 1104. According to the principle of reversibility of the optical path, the two light beams 1301 and 1303 correspond to two virtual light points S1 and S2 respectively, that is to say, their optical effects are the same as the effects of the two beams of light emitted from the virtual light points S1 and S2. Therefore, as long as the position of the light collimating element 1104 is designed so that the virtual light points S1 and S2 are located on the focal plane of the light collimating element 1104, it is possible to achieve that the two light beams form parallel light beams after passing through the light collimating element. The two parallel light beams formed at this time are equivalent to being emitted by two virtual light points S1 and S2, that is, corresponding to two light points. After the two parallel light beams are reflected by the reflector array 1105, each sub-reflector on the reflector array can be illuminated by the two parallel light beams, that is, two small light beams and two small light spots are formed. The two small light spots are the images of the virtual light points S1 and S2. In this way, the effect of doubling the number of small light spots is achieved without increasing the number of sub-reflectors.

[0012] The reason why this scheme can be established is that there is a premise, that is, the light collection angle of the light collimating element is less than half of the light-emitting angle of the light-emitting point S0. The present invention can be understood as follows: the light-emitting angle A emitted by S0 is divided into multiple parts by the light guide of the light-collecting device, each part corresponds to a virtual light point, and each part can achieve the light divergence angle of B, so that the light beam emitted by each virtual light point can cover the range of the light collimating element and be collimated separately by the light collimating element. In this way, in order to at least divide the light-emitting angle A of the light point into two parts (that is, to form two virtual light points, and the number of small light spots is doubled), and each part can achieve the light divergence angle of B, it is also required that B

[0013] In this embodiment, the light beam 1302 near the optical axis of the light-emitting point S0 is not guided by the light-collecting device, but is directly emitted and projected onto the light collimating element 1104. Of course, this part of the light can also pass through the light collimating element 1104 and form parallel light, and form multiple small light spots after being reflected by the reflector array. Therefore, in this embodiment, the light-emitting point S0 is added with two additional virtual light points S1 and S2 through the light-collecting device, which is equivalent to the three light-emitting points S0, S1, and S2 emitting light at the same time in terms of optical effect. In this way, after passing through the light collimating element and the reflector array, three times the number of small light spots as the sub-reflectors can be formed. It is easy to understand that Figure 1 ​Only two light guides 1102 and 1103 are shown on the paper, so there is space outside the paper to add other light guides, so that more small light spots can be formed.

[0014] In this embodiment, the full angle of light emission A of the light emitting point S0 is greater than 60 degrees, for example, A is 70 degrees. At this time, the full angle of light collection B of the collimating optical element should be less than 35 degrees. If B is smaller, for example, B is equal to 20 degrees, then the light emission of the light emitting point S0 can be divided into more parts and equivalently multiple virtual light emitting points project light with a full angle of B to the collimating optical element. In fact, the full angle of light emission of S0 can also be 40 degrees. At this time, as long as B is less than 20 degrees, it can meet the requirements of the present invention.

[0015] From another perspective, if the full angle B of the collimating optical element is set, then only the light at angle A in the light-emitting point S0 is used, and the rest of the light will be wasted. For example, if B = 20 degrees, A is set to 60 degrees (satisfying B

[0016] In order to improve the energy utilization rate, the light source also includes a convex lens or a lens group, which is used to compress the luminous angle of the large-angle light emitted by the light source. For example, the convex lens or convex lens group can collect the light emitted by the light source with a full angle of 130 degrees, and emit light with a full angle of 70 degrees. This is equivalent to A=70 degrees, and B=20 degrees can achieve the beneficial effects of the present invention. At this time, 130 degrees of light from the light source are utilized, and the utilization rate is obviously much higher than the case where only 70 degrees of light are utilized. The role of the convex lens or lens group is to receive large-angle incident light and compress it to emit light with a relatively small angle, and obviously other light angle compression elements including reflective cups can also achieve the same purpose. In other words, the light angle compression element included in the light source is used to receive light with an angle range of C emitted by the light source and emit light with a full angle of A, where C>A.

[0017] exist Figure 1 ​​In the illustrated embodiment, S0 is used as a real light emitting point, and two virtual light emitting points S1 and S2 are formed under the action of the light collecting device. However, the optical paths of the virtual light emitting points S1 and S2 are the same (symmetrical up and down), and can be located on the focal plane of the light collimating element at the same time. The optical path of the light emitting 1302 of S0 is obviously shorter than the optical path of the light emitting S1 (this is because the optical path of S1 reaches the light collimating element after being reflected by the reflector 1102, and according to the triangle principle, the sum of the lengths of the two sides must be greater than the third side). Therefore, when S1 and S2 are located on the focal plane of the light collimating element, S0 must be located between the focal plane and the light collimating element, so that the light beam 1302 emitted by the defocused S0 will not be perfectly collimated by the light collimating element, and the small light spot formed by it passing through the reflector array will be larger.

[0018] In another embodiment of the present invention, another light guide is used for direct light emission of the real light emitting point S0 to form another virtual light emitting point, so that this problem is solved. Figure 2 shown.

[0019] This embodiment and Figure 1 The difference between the embodiments shown is that, in this embodiment, another light guide 2107 including a convex lens is also included, wherein the convex lens 2107 is used to collect the light around the optical axis of the light-emitting point. At the same time, the reflector is used to collect the light emitted by the light-emitting point away from the optical axis. The light beam emitted by the light-emitting point S0 is refracted by the convex lens 2107 and then transmitted to the light collimating element. According to the principle of reversible light path, its equivalent virtual light-emitting point S0' is located on the side of the real light-emitting point S0 away from the light collimating element. Through reasonable design, S0', S1 and S2 can have the same optical path and are all located on the focal plane of the light collimating element. In this way, it can be ensured that the three beams of light are perfectly collimated after passing through the light collimating element, and further ensure that the small light spots are all minimized and brightest.

[0020] Another effect of using the convex lens 2107 is that after the light beam is gathered by the convex lens, its luminous angle is B (corresponding to the light collection angle of the light collimating element), so the light collection angle of the convex lens must be greater than B, that is, greater than the light collection angle of the reflector. Therefore, compared with the virtual light points S1 and S2, the light beam emitted by the virtual light point S0' contains more energy, and the small light spot finally formed is also larger. The advantage brought by this is that the multiple small light spots finally formed by the reflector array are large and small, bright and dark, so the decorative effect is better and more three-dimensional visually. Therefore, the convex lens 2107 can not only make the energy of the middle light beam more, but also make the virtual light point S0' located on the focal plane of the light collimating element, so that the small light spot formed by the virtual light point S0' is brighter and clearer.

[0021] In the above description, light guide is used in many places, and light guide may refer to different components. Figure 1 In the embodiment shown, the light guides are reflectors 1102 and 1103. Figure 2 In the embodiments shown, some light guides are still reflectors, while others are convex lenses; in the following embodiments, the light guides may also be prisms. Regardless of the type of light guide, they all guide the light beam to the light collimating element. Therefore, in this specification, such elements are collectively referred to as light guides without causing misunderstanding. Figure 2 In the illustrated embodiment, different light guides may be different components, which does not affect the reader's understanding of the solutions of the present invention.

[0022] In the above embodiment, a reflector is used as a light guide. In fact, a prism can also be used as a light guide. The reflector guides the light beam to the light collimating element by reflection, while the prism guides the light beam to the light collimating element by refraction. Figure 3a In another embodiment shown, the light emitted by the light emitting point S0 is divided into two parts in the up and down directions, the upper part 3301 is incident on the upper part of the prism 3102, and the lower part 3303 is incident on the lower part of the prism 3102. The two parts of light 3301 and 3303 are refracted at different positions of the prism and are respectively directed to the light collimating element 3104, and are reflected by the reflector array 3105 after being collimated by the light collimating element 3104 to form a plurality of small light spots. According to the principle of reversible optical path, the two parts of light 3301 and 3303 correspond to the virtual light emitting points S1 and S2, respectively, so that the number of small light spots twice the number of sub-reflectors on the reflector array can be realized.

[0023] In this embodiment, the light receiving device is a prism 3102, and the light receiving device includes two light guides, one light guide is a prism in the upper half of the prism 3102, and the other light guide is a prism in the lower half of the prism, and the two light guides are integrally formed to form a large prism. The light emitting angles of the light emitting points corresponding to the two light guides (i.e., the upper and lower parts of the prism 3102) are the same, and such a symmetrical design can ensure that the optical path of the light guided by the two parts is the same, so that the two virtual light emitting points S1 and S2 can be designed to be located on the focal plane of the light collimating element at the same time.

[0024] In another example of this embodiment, the front view of the prism 3102 is as follows: Figure 3bAs shown. It can be seen that the light receiving device is composed of three light guides 3102a, 3102b and 3102c, each of which is a small prism that guides light beams emitted from different directions to the light collimating element. It can be understood that three virtual light points can be formed in this way, thereby finally achieving a small light spot three times the number of sub-reflectors.

[0025] In the aforementioned embodiments, there is only one real light point, and then at least two virtual light points are derived from this real light point to achieve the purpose of multiplying the number of small light spots. In order to further increase the number of small light spots, the light source includes at least two light points, and these two real light points can respectively use light collecting devices to generate virtual light points. Preferably, at least part of the light guides in the light collecting devices of different light points are shared. The advantage of this is that it can reduce system complexity and cost. For example, when the same reflector is used as a light guide, it can be used as a light guide for two real light points to generate two corresponding virtual light points. And Figure 3a and Figure 3b The prism shown is the same, and can also be used as a light guide for two real light points to generate corresponding virtual light points. In this way, the number of virtual light points can be greatly increased without increasing the complexity of the system, thereby increasing the number of small light spots.

[0026] In the description of the above embodiment, the light source is not described. In fact, there can be many types of light sources. The smaller the light point of the light source, the smaller the small light spot produced, and the better the decorative effect. Therefore, preferably, the light source includes a laser and a fluorescent element. The point where the laser emitted by the laser is incident on the fluorescent element is the light point, and the light point produces a wide spectrum of light. Since the laser energy emitted by the laser is concentrated, it is easier to produce a smaller light spot. The fluorescent element can be excited at this small excitation point to produce high-brightness white light, thereby realizing a light source with a small light point area. More preferably, the light source also includes an aperture located at the rear end of the optical path of the fluorescent element and close to the fluorescent element, and the light-transmitting hole of the aperture covers the light point of the light source. In this way, the edge of the light point of the light source can be sharper, thereby realizing a small light spot array with higher contrast and achieving better visual effects.

[0027] In the description of the above embodiments, the light collimating element is a convex lens, and the reflector array has an upward convex shape. In fact, the light collimating element can also be a curved reflector, and the reflector array can also be a downward convex shape. Obviously, the light collimating element and the reflector array are not limited to their specific forms as long as they can achieve the functions defined in the present invention.

[0028] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A lamp, characterized in that: include: A light source includes at least one light-emitting point, and the light-emitting full angle of the light-emitting point is A; A collimating optical element, wherein the distance between the focal point of the collimating optical element and the plane of the element is F, and the effective aperture of the collimating optical element is D; the collimating optical element is used to collimate an incident light beam with a full-angle of light emission of B emitted from the focal position into parallel light, wherein B=2*arctg(D / 2F), and B is less than A / 2; A light collecting device located between the light source and the light path of the collimating optical element, the light collecting device comprising at least two light guides, for respectively collecting light beams emitted from the light source along different angles, and respectively guiding the collected light beams to the collimating optical element in a reflection or refraction manner, and forming parallel light after being collimated by the collimating optical element; The reflector array is used to reflect the parallel light to form a reflection light spot array. Each sub-reflector on the reflector array can reflect a part of the parallel light incident thereon and form a small light beam.

2. The lamp according to claim 1, characterized in that: The light guide includes a reflector.

3. The lamp according to claim 2, characterized in that: There is another light guide including a convex lens for collecting the light emitted around the optical axis of the light emitting point, and a reflector for collecting the light emitted from the light emitting point away from the optical axis.

4. The lamp according to claim 3, characterized in that: The light collecting angle of the convex lens is greater than the light collecting angle of the reflector.

5. The lamp according to claim 1, characterized in that: The light source includes a light angle compression element, which is used to receive light with an angle range of C emitted by the light source and emit light with a full angle of A, wherein C>A.

6. The lamp according to claim 1, characterized in that: The light guide includes a prism.

7. The lamp according to claim 6, characterized in that: At least two light guides include prisms, and the light emitting angles of the light emitting points corresponding to the two prisms are the same.

8. The lamp according to claim 6, characterized in that: At least two light guides include prisms, and the two prisms are integrally formed.

9. The lamp according to claim 1, characterized in that: The light source includes at least two light-emitting points, and at least part of the light guides in the light receiving devices of different light-emitting points are shared.

10. The lamp according to any one of claims 1 to 9, characterized in that The light source includes a laser and a fluorescent element. The point where the laser light emitted by the laser is incident on the fluorescent element is a light-emitting point, and the light-emitting point generates broad-spectrum light.

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