Light source device and lamp

Abstract

The light source device comprises an LED chip and a plurality of reflector plates, light emitted by the LED chip is converted into light emitted in uniform surface distribution and uniform angle distribution through a unit light channel formed by the reflector plates, then a plurality of LED units are spliced to form an LED unit array, traditional complex optical elements such as fly-eye lenses are replaced, uniform light spots are achieved, and meanwhile light emitted by the LED unit array is emitted. And the cost is greatly reduced. And meanwhile, uniform angular distribution is converted into uniform surface distribution on the P surface through the converging lens, so that the uniformity of the lamp is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of stage lighting, in particular to a light source device and a lamp using the light source device. BACKGROUND

[0002] In the field of stage lighting, it is necessary to hoist a stage lamp at the top, and the light projected by the stage lamp needs to form a uniform light spot on the stage. The light spot is generally circular, and can also be transformed into a pattern. The principle of such a stage lamp is to use a light source device, which has a focal point. The light energy has a uniform distribution at the focal point. There is a rotatable pattern disc near the focal point. The pattern disc has a plurality of hollow patterns, such as circles or pentagons, along the circumferential direction. When a hollow pattern enters the light path, the uniform light spot at the focal point of the light source device is used to illuminate the hollow pattern. At the same time, a projection lens is used to image the pattern to a distant place, thus forming a uniform pattern light. In such an optical structure, the light source device capable of forming a uniform light distribution with a certain divergence angle is an important component and a key component affecting the performance of the lamp. Patents CN204254511U and CN216113489U respectively disclose a technology for using a lens array or a compound eye lens array to shape the discrete light emission of multiple LEDs into a uniform light spot. The problem with this technology is that multiple lens arrays and compound eye lens arrays are needed, and the smaller the compound eye particles, the higher the uniformity but the higher the cost, that is, there is a contradiction between cost and uniformity. Therefore, the market needs a more cost-effective uniform light source device solution. SUMMARY

[0003] In order to solve the problem of high cost of traditional light source device based on compound eye lens, the utility model provides a light source device, including at least four LED units, the four LED units are closely arranged and form LED unit array; the LED unit array includes light emitting surface; each LED unit includes LED chip and a plurality of reflecting sheet, the LED chip is quadrilateral or hexagon, the light emitting surface of LED chip is parallel with the main plane, and each edge of LED chip corresponds to a reflecting sheet; a plurality of reflecting sheets are adjacent to each other and form a unit light channel, the light emitting surface of the LED unit array is closely arranged by the unit light channel of the at least four LED units; in the corresponding relationship between any LED edge and reflecting sheet, the reflecting sheet is curved in the trajectory of parabola in Z direction and faces the LED edge, and the reflecting sheet is congruent in the direction along the LED edge; wherein, the focus of the parabola coincides with the LED edge, and the included angle between the axis of the parabola and Z direction is A, A is less than 20 degrees; further include the converging lens located at the rear end of the light path of LED unit array, and the converging lens is used for receiving the light emitted from the light emitting surface of LED unit array and converging it on the P surface located at the rear end of the light path of converging lens. Further provide a lamp, including the light source device, further including pattern diaphragm and projection lens, the pattern diaphragm is located at the P surface of the light source device, and the focal plane of the projection lens coincides with the plane where the pattern diaphragm is located.

[0004] The unit light channel formed by the reflecting sheet converts the light emitting of LED chip into uniform surface distribution and uniform angle distribution, and a plurality of LED units are spliced to form LED unit array, so that the traditional compound eye lens and other complex optical elements are replaced, the uniform light spot is realized, and the cost is greatly reduced. Meanwhile, the converging lens converts the uniform angle distribution into uniform surface distribution on the P surface, and the uniformity of the lamp is improved. BRIEF DESCRIPTION OF DRAWINGS

[0005] Figure 1a The optical structure schematic diagram of the LED unit in the first embodiment of the utility model is shown;

[0006] Figure 1b And Figure 1c The perspective view and the top view of the LED unit shown in the figure are shown respectively; Figure 1a The perspective view and the top view of the LED unit shown in the figure are shown respectively;

[0007] Figure 2 The perspective view of the LED unit array of the first embodiment of the utility model is shown;

[0008] Figure 3 The perspective view of the light source device of the first embodiment of the utility model is shown;

[0009] Figure 4a The perspective view of the light source device of the first embodiment of the utility model is shown; Figure 3A schematic view of the optical structure of a lamp to which the light source device shown is applied;

[0010] Figure 4b A schematic view of the optical structure of a lamp to which the light source device shown is applied; Figure 4a A side view in -Z direction of the light source device in the embodiment shown;

[0011] Figure 4c A schematic view of the optical structure of a lamp to which the light source device shown is applied; Figure 4a A schematic view of the working principle of the reflecting diaphragm of the light source device in the embodiment;

[0012] Figure 5a A partial enlarged view of the reflecting tip in another embodiment;

[0013] Figure 5b A schematic view of the optical structure of a lamp to which the light source device shown is applied; Figure 5a A schematic view of the structure of the light source device of the reflecting tip shown;

[0014] Figure 6a A schematic view of the optical structure of a lamp to which the light source device shown is applied; 6b A perspective view of a hexagonal LED unit and its LED unit array in another embodiment, respectively;

[0015] Figure 7 A schematic view of the structure of the LED linear array in another embodiment;

[0016] Figure 8 A schematic view of the optical structure of a lamp to which the light source device based on the LED linear array is applied;

[0017] Figure 9 A schematic view of the far field spot in another embodiment;

[0018] Figure 10a A schematic view of the structure of the light source device in another embodiment;

[0019] Figure 10b A schematic view of the optical structure of a lamp to which the light source device shown is applied; Figure 10a A schematic view of the working principle and optics of the converging lens in the embodiment;

[0020] Figure 11a A schematic view of the optical structure of a lamp to which the light source device shown is applied;

[0021] Figure 11b A schematic view of the optical structure of a lamp to which the light source device shown is applied; Figure 11a A side view in -Z direction of the light source device in the embodiment shown; DETAILED DESCRIPTION

[0022] In the following description, the optical axis direction defining the light emitting direction of the light source device is the Z direction, the plane perpendicular to the Z direction is defined as the main plane, the direction with an angle A with the Z direction is defined as the A direction, and the plane perpendicular to the Z direction is defined as the main plane. The +Z direction is defined as the direction along the Z direction consistent with the light emitting direction of the light source device; the -Z direction is defined as the direction along the Z direction opposite to the light emitting direction of the light source device.

[0023] The utility model provides a kind of light source device, and the light source device includes at least four LED units, and the four LED units are closely arranged to form LED unit array each other.The LED unit array includes light emitting surface.Each LED unit includes LED chip and multiple reflection sheet, and the LED chip is quadrilateral or hexagonal, and the light emitting surface of LED chip is parallel with main plane, and each edge (hereinafter referred to as LED edge) of LED chip is respectively corresponding with one reflection sheet one-to-one;Multiple reflection sheets are closely arranged to form a unit light channel each other, and the light emitting surface of LED unit array is closely arranged by the unit light channel of at least four LED units.

[0024] The position relationship between a corresponding LED edge and a reflector is described below with reference to Fig. 1. In Fig. 1, the LED chip 101 is a quadrilateral, specifically a square, one edge of which is 101a, and the reflector corresponding to the LED edge 101a is reflector 102a. The reflector 102a is curved in a parabolic trajectory in the Z direction (indicated in Fig. 1) and faces the LED edge 101a, and the reflector 102a is congruent in the direction along the LED edge 101a, in other words, the line segment obtained by intersecting the reflector 102a with any first plane is congruent, i.e. the line segments obtained by intersecting the reflector 102a with the first planes are all the same parabolic segments; the first planes are arranged along the LED edge, each first plane is perpendicular to the edge and parallel to the Z direction. The focus of the parabolic trajectory coincides with the LED edge 101a, and the angle between the axis 141 of the parabolic trajectory and the Z direction is A, A < 45 degrees. Observing three light rays 121a, 122a and 123a emitted from the LED edge 101a and facing the reflector 102a, since the reflector 102a is congruent in the direction along the LED edge 101a and the focus of the parabolic trajectory coincides with the LED edge 101a, according to the definition of the parabolic trajectory, the three light rays 121a, 122a and 123a are emitted in the direction of the axis 141 of the parabolic trajectory after being reflected by the reflector, i.e. the angle between the reflected light rays 121a, 122a and 123a and the Z direction is A. It can be judged that all the light rays emitted from the LED edge 101a and incident on the reflector 102a are reflected by the reflector 102a and emitted in the direction of the axis 141. On this basis, observing any light emitting point 101x inside the light emitting surface of the LED chip which is not on the LED edge 101a, the light ray 122x emitted from the light emitting point 101x is incident on the same position on the reflector 102a as the light ray 122a, and according to geometric optics, the angle between the emitted direction of the light ray 122x reflected by the reflector and the Z direction is less than A. By extension, the angle between the emitted direction of any light ray emitted from the light emitting point 101x and incident on the reflector 102a and the Z direction is less than A after being reflected by the reflector 102a. By further extension, the angle between the emitted direction of any light ray emitted from any point on the light emitting surface of the LED chip and incident on the reflector 102a and the Z direction is less than or equal to A after being reflected by the reflector 102a.

[0025] In the utility model, any corresponding LED edge and reflector satisfy the position relationship described above. Figure 1b is Figure 1a the perspective view of the embodiment shown, wherein 103 represents the heat-conducting substrate of the LED, and the heat-conducting substrate 103 is larger than the light emitting surface of the LED chip 101; Figure 1c is Figure 1a the top view of the embodiment shown, in Figure 1c the Z direction penetrates the paper surface perpendicularly. Referring toFigure 1a 、 1b And 1c, we explain the other several LED edge and the position relation of the reflector. LED edge 101b and reflector 102b are corresponding relationship, LED edge 101c and reflector 102c are corresponding relationship, LED edge 101d and reflector 102d are corresponding relationship. According to the working principle of LED edge 101a and reflector 102a in the above, any point on the light emitting surface of LED chip emits the light incident on reflector 102a, reflector 102b, reflector 102c and reflector 102d respectively, and the angle between the reflected direction of the light and the Z direction is less than or equal to A. Again, since multiple reflectors 102a, 102b, 102c and 102d are adjacent to each other to form a unit light channel 102 (as shown), the light emitted from the LED chip 101 is incident on the inner wall of the light channel 102 and reflected, and the light is emitted in the direction less than or equal to A. Therefore, for Figure 1a 、 1b And 1c, the light emitted by the LED chip can be collected in a reflective manner, and the emission angle of the light emitted from the unit light channel 102 can be ensured to be less than or equal to A. At the same time, the unit light channel 102 itself has the function of uniform light, that is, the light emitted in different directions by the LED chip 101 is reflected by different unit light channels 102 and then overlaps with the light outlet of the unit light channel 102, so that the light at the light outlet of the unit light channel 102 has a relatively uniform distribution.

[0026] The light source device of the utility model discloses at least four above-mentioned LED unit, and the four LED units are closely arranged and form LED unit array, and the light emitting surface of LED unit array is closely arranged by the unit light channel of at least four LED units. Taking nine LED units arranged in the form of 3x3 to form LED unit array as an example, the perspective view of the nine LED units is shown in Figure 2 As can be seen from the drawings, each LED unit is as shown in Figure 1b Since the reflector is congruent in the direction along its corresponding LED edge, the side walls of the nine LED units can be closely connected. Since each LED unit can emit light with an emission angle less than or equal to A, and since the light distribution at the light outlet of the unit light channel of each LED unit is relatively uniform, the light distribution at the light outlet after splicing is also relatively uniform. The contour shape of the light emitting surface after splicing is determined by the splicing mode of the multiple LED units, for example, in Figure 2In the illustrated embodiment, the contour shape of the light exit surface after splicing is a square (the dashed line 204 in the figure represents the contour shape). Of course, the spliced joint is without light, and due to the thickness of the reflecting sheet, the splicing joint between the LED units is inevitable, and thus absolute uniformity cannot be achieved.

[0027] Therefore, in the utility model, as Figure 3 indicated, it further comprises a plurality of reflecting planes 305a, 305b, 305c, 305d parallel to the Z direction, the plurality of reflecting planes are adjacent to each other to form a total light channel 305, and the cross-sectional shape 304 of the total light channel 303 on the main plane is the same as the outer contour of the light exit surface of the LED unit array, which is a square in the embodiment. In this way, the total light channel 305 is closely connected with the light exit surface of the LED unit array and receives the emitted light of the LED unit array. Since the plurality of reflecting planes 305a, 305b, 305c, 305d are parallel to the Z direction, the total light channel 305 formed by the plurality of reflecting planes 305a, 305b, 305c, 305d adjacent to each other is a light channel parallel to the Z direction, and the part of the light emitted from the light exit surface of the LED unit array and incident to the light channel is reflected by the plurality of reflecting planes 305a, 305b, 305c, 305d, and the total light emission angle does not change, and the angle with the Z direction is still less than or equal to A; at the same time, due to the effect of multiple reflections, the light at the light exit port of the total light channel 305 becomes completely uniform, and the dark line caused by the joint of the light exit surface of the LED unit array is eliminated. Finally, since the cross-sectional shape 304 of the total light channel 305 on the main plane is the same as the outer contour of the light exit surface of the LED unit array, the size of the light exit surface does not increase, and the light energy density does not decrease.

[0028] In summary, Figure 3 In the embodiment of the light source device of the utility model, at the light exit port of the total light channel 305, the emitted light with uniform light distribution and an emission angle less than or equal to A is formed, and compared with the traditional light source device based on the compound eye lens, the utility model does not use a lens, but uses a cheap reflecting sheet to control light, and thus the cost is greatly reduced. Moreover, in the traditional light source device based on the compound eye lens, the lens is transmissive, and according to the optical knowledge, any refraction of light causes dispersion, which is determined by the material of the lens. The reflection on the reflecting sheet does not cause dispersion, and thus the emitted light of the light source device of the embodiment of the utility model also has the advantage of no dispersion.

[0029] In the embodiment, preferably, as Figure 1a , 1b and 1c, the edge of the reflecting sheet in the -Z direction is referred to as a lower edge, and in the corresponding relationship between the at least one pair of LED edges and the reflecting sheet, the lower edge of the reflecting sheet is in contact with the opposite edge of the corresponding LED edge. For example, in Figure 1aIn the middle, LED edge 101a corresponds to reflective sheet 102a, and the lower edge of reflective sheet 102a contacts the opposite edge 101b of LED edge 101a, which has the advantage that the area of the light inlet and light outlet of the unit light channel is minimized without affecting the working principle described above and realizing the premise that the angle of reflected light is less than or equal to A, thus maximizing the energy density. Similarly, LED edge 101b corresponds to reflective sheet 102b, and the lower edge of reflective sheet 102b contacts the opposite edge 101a of LED edge 101b; LED edge 101c corresponds to reflective sheet 102c, and the lower edge of reflective sheet 102c contacts the opposite edge 101d of LED edge 101c; LED edge 101d corresponds to reflective sheet 102d, and the lower edge of reflective sheet 102d contacts the opposite edge 101c of LED edge 101d, that is, the lower edge of each reflective sheet of the unit light channel contacts the opposite edge of the corresponding LED edge, so that the light inlet of the entire unit light channel is close to the light-emitting surface of the LED, and the energy density can be maximized, and the uniformity of the light outlet of the unit light channel is also the best. Of course, even if the lower edge of the reflective sheet does not contact the opposite edge of the corresponding LED edge, that is, there is a gap between the two, it does not affect the working principle and beneficial effects of the reflective sheet described above.

[0030] In the present embodiment, preferably, as Figure 1a 、 1bAs shown in Figure 1c, the edge of the reflector in the +Z direction is called the upper edge. In at least one pair of LED edges and reflectors, the angle between the line connecting the LED edge to the upper edge of the reflector and the Z direction is A. For example, if LED edge 101a corresponds to reflector 102a, the angle between the line 142 connecting LED edge 101a to the upper edge of reflector 102a and the Z direction is A. This effectively defines the height of reflector 102a in the Z direction. As mentioned earlier, the angle between the light incident on the LED chip and the reflector 102a and the Z direction is less than or equal to A. The angle between the line 142 connecting the LED edge 101a to the upper edge of the reflector 102a and the Z direction is A. This ensures that all the light emitted from the LED edge 101a, all the light with an angle less than or equal to A with the Z direction, can be emitted directly. The remaining light with an angle greater than A with the Z direction, after being incident on the reflector 102a and reflected, has an emission angle less than or equal to A. Thus, all the light emitted from the LED edge 101a, regardless of whether it is incident on the reflector 102a, has an emission angle with an angle less than or equal to A with the Z direction. Consider any point 101x on the LED chip. The angle between the line connecting point 101x and the upper edge of the reflector 102a and the Z-direction is less than A. Therefore, the light emitted from any point on the LED chip, regardless of whether it is incident on the reflector 102a, will have an exit angle with an angle less than or equal to A with the Z-direction. In this way, the angles of all light emitted from the LED chip are completely controlled, meaning they are entirely within the range of angles less than or equal to A. This simplifies the design of the rear-end lens and increases efficiency. Of course, even if the angle between the line connecting the LED edge to the corresponding upper edge of the reflector and the Z-direction is greater than or less than A, it does not affect the working principle and beneficial effects of the reflector. Since A is less than 45 degrees, the half-angle of light collection in the rear-end optical system only needs to be less than 45 degrees, which is advantageous and cost-effective for optical system design.

[0031] In this embodiment, preferably, at least one reflective plane 305a, 305b, 305c, or 305d is integrally formed with the reflective sheet closely connected thereto. In this way, at least in this local area, the total light channel is closely connected with the light-emitting surface of the LED unit array without gaps, which improves the light transmission efficiency and the uniformity of light emission.

[0032] Figure 4a This indicates that Figure 3 The diagram shows a light source device applied to the optical path structure of a lamp. The lamp includes a light source device 451, which is as shown below. Figure 3The light source device is shown, and the lamp further comprises a pattern diaphragm 452 and a projection lens group 453 and 454. In actual application, in some cases, only one projection lens can be used to realize the function of the projection lens group, and therefore, in the present application, the projection lens refers to a single projection lens and a multi-piece projection lens group. The pattern diaphragm 452 is located behind the light path of the total light channel 405 of the light source device 451, the focal plane of the projection lens coincides with the plane where the pattern diaphragm 452 is located, and therefore, the light emitted by the light source device 451 can illuminate the pattern on the pattern diaphragm 452. Since the light outlet of the total light channel of the light source device 451 has a uniform light distribution, and the angle of the light emitted is less than or equal to A, this is equivalent to that the pattern on the pattern diaphragm has a uniform light distribution, and the angle of the light emitted is less than or equal to A. Since the focal plane of the projection lens coincides with the plane where the pattern diaphragm 452 is located, the pattern of the pattern diaphragm can be projected to a distance by the projection lens, and a uniform pattern light spot is formed. Since the angle of the light emitted from the pattern is less than or equal to A, the light collection angle of the projection lens only needs to be less than or equal to A, and therefore, it is relatively easy to design and realize.

[0033] Figure 4b is Figure 4a The side view of the light source device 451 and the pattern diaphragm 452 from the right side in the embodiment is shown. As Figure 4b shown, in the present embodiment, the pattern diaphragm 452 is also a reflective diaphragm 452 covering the light outlet of the total light channel 405, and the reflective diaphragm 452 is divided into a reflective area 452b and a light-transmitting area 452a, wherein the side of the reflective area 452b facing the total light channel 405 has reflectivity. Among the light emitted from the light outlet of the total light channel 405, the part incident to the light-transmitting area 452a can pass through the reflective diaphragm and be emitted, and the part incident to the reflective area 452b is reflected by the reflective area and at least partially returns to the total light channel 405 and propagates inward. This part of the reflected light passes through the total light channel and the unit light channel and finally is incident to the surface of the LED chip. The LED chip itself has reflectivity, and therefore, this part of the light is reflected by the LED chip again, is equivalent to being emitted from the LED chip again, and is finally emitted from the light outlet of the total light channel, and most of it is emitted from the light-transmitting area 452a, and therefore, the reflected light of the reflective area 452b is not wasted, but most of it can be reused, which is equivalent to that this part of the light is recycled. Figure 4c The mechanism of this light recycling is explained. In Figure 4cIn the embodiment, the outgoing light 421 is reflected by the reflecting area of the reflecting diaphragm 452 and finally incident on the LED chip 401 and then re-emerges from the LED chip 401 to form the outgoing light 422. The light recycling mechanism can reduce the energy loss and improve the efficiency while forming the pattern light. In the embodiment, the light-transmitting area is circular, and the light-transmitting area can also be other shapes, which can be realized according to actual needs. In actual application, the reflecting diaphragm can be independent of the pattern diaphragm, and the pattern diaphragm and the reflecting diaphragm can be used simultaneously. For example, a reflecting diaphragm covering the light outlet of the total light channel is used to form a circular light outlet shape, and a rotatable pattern diaphragm located at the rear end of the light path of the reflecting diaphragm is used, the pattern diaphragm has multiple patterns along the circumferential direction, and the patterns can be switched by rotating the pattern diaphragm.

[0034] In the foregoing embodiment, the LED units are closely arranged to form an LED unit array, and the adjacent LED units have closely contacted reflecting pieces. As described above, since the reflecting pieces have thickness, the joints of the adjacent LED units formed here are not light-emitting, and thus the uniformity of the light-emitting surface of the LED unit array is destroyed. In the foregoing embodiment, the reflecting plane and the total light channel composed of the reflecting plane are used to solve the problem of non-uniformity, but the height of the light source device is increased. In the following embodiment, the problem will be optimized.

[0035] Another embodiment of the utility model has a structure schematic diagram as shown in Figure 5b A partial enlarged view as shown in Figure 5a The embodiment and Figure 3The difference of the embodiment shown is in two aspects. Firstly, in the embodiment, the edge of the reflective sheet in the +Z direction is called the upper edge; a reflective tip 507 is further included, which is located at and covers the upper edge joint of two reflective sheets 502a and 506a of two adjacent LED units (in other words, the reflective tip 507 is located at and covers the upper edge joint of two reflective sheets (see 502a and 506a in the figure), which are the two closest reflective sheets on two adjacent LED units, and the upper edges of the two reflective sheets are parallel to each other), one side of the reflective tip 507 in contact with the upper edge joint of the reflective sheet is called the wide end 507a, the other end of the reflective tip 507 is called the tip end 507b, the tip end 507b is in the +Z direction of the wide end 507a, and the width of the tip end 507b is smaller than that of the wide end 507a. The surface between the tip end and the wide end of the reflective tip 507 has reflectivity. It can be understood that the reflective surface of the reflective tip 507 is a continuation of the reflective surfaces of the two reflective sheets 502a and 506a, which can effectively and substantially reduce the width of the gap, so that the length of the total light channel can be substantially reduced. Secondly, 25 LED units are used in the embodiment, which are closely arranged in a 5x5 manner to form an LED unit array.

[0036] In the foregoing embodiments, the quadrangular LED chips are used as examples. In fact, hexagonal LED chips can also be used for implementation. The schematic diagram of an LED unit using a hexagonal LED chip and its reflective sheet is shown in Figure 6a It can be understood that the six reflective sheets corresponding to the six sides of the LED chip form a unit light channel, and the light exit surface of the unit light channel is also hexagonal. In the light source device of the embodiment, seven LED units are included, which are closely arranged in a honeycomb shape to form an LED unit array, and the light exit surface of the LED unit array is also honeycomb-shaped, as shown in Figure 6b Figure 6b In the embodiment shown, the total light channel is not drawn. Compared with the foregoing quadrangular light exit surface, such a honeycomb-shaped light exit surface is closer to a circular shape, so if a circular pattern light is formed using the most commonly used circular pattern diaphragm, the light loss is smaller and the efficiency is higher.

[0037] The arrangement of different LED units can be other than Figure 3 the four-square array arrangement of the embodiment shown in Figure 6b and the honeycomb arrangement shown in

[0038] The structure schematic diagram of another embodiment of the utility model is shown in Figure 7 ​As shown. Unlike the previous embodiments, the light source device in this embodiment includes at least three LED units, which are arranged closely and linearly to form an LED linear array; the LED linear array includes a light-emitting surface. Each LED unit includes an LED chip and multiple reflectors. The LED chip is quadrilateral, and the light-emitting surface of the LED chip is parallel to the main plane. Each side of the LED chip corresponds to a reflector. Multiple reflectors are adjacent to each other to form a unit light channel. The light-emitting surface of the LED linear array is formed by the close linear arrangement of the unit light channels of at least three LED units. Specifically, this embodiment includes six LED units 751, 752, 753, 754, 755, and 756, which are arranged closely and linearly in sequence. These LED units also include four reflective planes parallel to the Z direction. Figure 7 (Not shown in the figure) The four reflective planes are adjacent to each other to form a total light channel. The cross-sectional shape of the total light channel on the main plane is the same as the shape of the light-emitting surface of the LED linear array, and both are rectangular. This makes the total light channel closely connected to the light-emitting surface of the LED linear array and receive the emitted light from the LED linear array. The light outlet of the total light channel is rectangular.

[0039] Unlike the previous embodiments, the light-emitting surface of the light source device in this embodiment is elongated, an effect that cannot be achieved by traditional compound-eye lens-based light source devices described in the background art. A schematic diagram of the optical path structure of this light source device applied to a lamp in an actual system is shown below. Figure 8 As shown. The lamp also includes projection lens groups 852 and 853, used to project the strip-shaped light outlet of the light source device into the far field to form a strip-shaped high-brightness light spot. This is a requirement in the practical application of stage lighting. In traditional technology, this requirement can only be met using lasers, while this technology uses an LED light source device, which is lower in cost and safer for the human eye. The longer the strip-shaped light spot required, the better. This requires the more LED units the better, and the longer the long side of the total light channel 805 of the light source device 851, the better. However, due to the aberration problem of the imaging lens, if the long side of the light outlet of the total light channel 805 is straight, then its edge cannot be well imaged by the projection lens group. To solve this problem, in this embodiment, the length of the reflective plane that makes up the total light channel in the Z direction is called its height, and the height Hc of the middle of the two reflective planes of the two long sides of the rectangle forming the light outlet of the total light channel is less than the height He at its two ends. The advantage of this is that as long as the focal point of the projection lens group on its central axis coincides with the middle of the long side of the light outlet of the main light channel of the light source device, the middle and edge of the long side of the light outlet of the main light channel can be clearly imaged by the projection lens group.

[0040] use Figure 8The lamp of the embodiment shown can form a high-brightness strip-shaped uniform light spot in the far field. However, due to the principle, only a single color can be formed. In actual needs, there is a demand for a strip-shaped light spot with multiple colors that can be switched. Therefore, preferably, the lamp comprises at least two light source devices as described in Figure 7 the light source device Figure 7 is not shown in the total light channel), the two light source devices are placed side by side along the short side direction of the light outlet of the total light channel thereof; the two light source devices have different colors or the two light source devices emit white light with different color temperatures. The two strip-shaped uniform light bands formed by the two light source devices and the same projection lens group in the far field are shown as 981 and 982 in Figure 9 , and the position relationship of the two strip-shaped uniform light bands is side by side along the short side direction. The two light bands have different colors or different color temperatures, which can realize different colors or color temperatures by lighting different light source devices in the lamp as needed.

[0041] In the foregoing embodiment, the light emitted by the light source device is divergent, and the light outlet of the light source device is the position where the light distribution is most uniform and the light energy density is highest. This brings a problem that the distance between the light source device and the projection lens (group) is relatively small, thereby limiting the increase of the function of the lamp. For example, for a stage lamp, many light effects are needed, and these light effects depend on optical devices between the light source device and the projection lens (group) to be realized, such as prisms, color sheets, etc. These devices themselves need mechanical actions such as rotation and switching to work, and therefore a relatively large physical space is needed.

[0042] In order to solve this problem, the utility model further provides an embodiment, and a structure diagram thereof is shown as Figure 10a In the embodiment, at least four LED units are included, and the four LED units are closely arranged to form an LED unit array 1011. The LED unit array 1011 comprises a light outlet surface. Each LED unit comprises an LED chip and a plurality of reflecting sheets, the LED chip is quadrangular or hexagonal, the light emitting surface of the LED chip is parallel to the main plane, and each edge of the LED chip corresponds to one reflecting sheet. The plurality of reflecting sheets are adjacent to each other to form a unit light channel, and the light outlet surface of the LED unit array is formed by closely arranging the unit light channels of the at least four LED units. In the corresponding relationship between any one LED edge and the reflecting sheet, the reflecting sheet is curved in the Z direction in the trajectory of a parabola and faces the LED edge, and the reflecting sheet is congruent in the direction along the LED edge; wherein the focus of the parabola coincides with the LED edge, and the angle between the axis of the parabola and the Z direction is A. The embodiment shown in Figure 3 The differences between the embodiment shown in

[0043] First, this embodiment also includes a converging lens 1012 located at the rear end of the optical path of the LED unit array 1011. The converging lens 1012 is used to receive light emitted from the light-emitting surface of the LED unit array 1011 (taking light ray 1021 as an example) and converge it onto the P-plane located at the rear end of the optical path of the converging lens 1012. According to the above... Figure 1a The working principle of the reflector and LED unit is explained as follows: the light emitted from LED edge 101a is reflected by reflector 102a and becomes light emitted along direction A (here, direction A refers to the direction of light emitted from the LED edge 101a). Figure 1a The light emitted from LED edge 101b, after being reflected by reflector 102b, becomes light emitted in the direction of A (where A refers to the direction of the right-hand side of the Z direction). Figure 1a The light emitted from any point 101x on the LED chip, whether incident on reflector 102a or 102b, is equivalent to light emitted from a point deviating from the focal point of the parabola. Therefore, most of the reflected light is concentrated near a specific angle smaller than A. Thus, it can be determined that the function of the unit light channel is to roughly transform the surface distribution of the LED chip into the angular distribution of the emitted light. Since the surface distribution of the LED chip is basically uniform, the angular distribution of the light emitted from the unit light channel is also basically uniform. In summary, the surface and angular distribution of the light emitted from the unit light channel are both basically uniform, which is determined by the characteristics of the LED chip and the characteristics of the unit light channel of this invention.

[0044] The following is combined Figure 10b The working principle of the converging lens is explained. To illustrate the angle of light incident on the converging lens 1012, in... Figure 10b In the design, a certain distance is intentionally placed between the LED unit array 1011 and the converging lens; in reality, this distance may not exist. Consider a beam of light 1022 emitted from the edge of the LED unit array, which has a certain divergence angle A and is incident on 1012. Figure 10bThe three rays of light beam 1022 represent different angles of the light beam. The converging lens 1012 has a certain ability to bend light, so the three rays of light beam 1022 have the same angle of twist after passing through the converging lens 1012, and thus form a light spot 1024 of a certain width on the P plane, the upper edge of the light spot 1024 corresponding to the ray of light beam 1022 of the uppermost angle, the lower edge of the light spot 1024 corresponding to the ray of light beam 1022 of the lowermost angle, and the center of the light spot 1024 corresponding to the ray of light beam 1022 of the central angle. Thus, the angular distribution of light beam 1022 becomes a surface distribution on the P plane after passing through the converging lens 1012. Similarly, the light beam 1023 emitted from the middle of the LED unit array also forms a light spot on the P plane after passing through the converging lens 1012, and the surface distribution of the light spot is equivalent to the angular distribution of light beam 1023. Therefore, the converging lens 1012 converts the surface distribution of the light emitted from the light-emitting surface of the LED unit array into the angular distribution of the converging light, and converts the angular distribution of the light emitted from the light-emitting surface of the LED unit array into the surface distribution on the P plane.

[0045] Since the angular distribution of the light emitted by each LED unit is substantially uniform, the converging light spot formed on the P plane after converging through the converging lens 1012 is also substantially uniform. At the same time, the converging light beam begins to diverge after passing through the P plane, and the divergence angle is determined by the surface type of the converging lens 1012, so the numerical range of the divergence angle can be realized as needed, thus achieving the purpose and beneficial effects of the present application.

[0046] Second, the present embodiment does not necessarily include Figure 3 the total light channel in the embodiment shown. Because in Figure 3 the embodiment shown, the purpose of the total light channel is to eliminate the seams between the LED units, so as to achieve uniform surface distribution on the light-emitting surface of the total light channel. As described above, in the present embodiment, the surface distribution of light energy on the P plane is not affected by the seams between the LED units, but is determined by the light-emitting angle distribution of the LED units, so the total light channel is not necessarily required in the present embodiment. Of course, using the total light channel can improve the surface uniformity of the light-emitting surface of the LED unit array, thereby improving the angular distribution uniformity of the converging light, and the light quality of the lamp is also helpful; and using the total light channel is beneficial to coupling the light emitted by the LED units into the converging lens, thereby improving the efficiency, so it may be used in actual use.

[0047] Third, in the embodiment, A is less than 20 degrees. This is because, to achieve a good work of the converging lens, the incident light should have a smaller divergence angle. The inventor has repeatedly concluded that A is less than 20 degrees is a good range in practice, which can achieve good results.

[0048] In summary, in the P plane of the embodiment, a uniform surface distribution is formed, and the light has a certain controllable angular distribution. Figure 11a The light path schematic diagram of the lamp made of the light source device Figure 10a is shown in FIG. 15. The light source device 1119 is also included, and the pattern light barrier 1156 and the projection lens 1153 and 1154 are also included. The pattern light barrier 1119 is located near the P plane of the light source device 1119, and the focal plane of the projection lens group coincides with the plane where the pattern light barrier 1156 is located. The uniform light spot formed by the light source device 1119 on the P plane illuminates the pattern light barrier, and the pattern of the pattern light barrier is projected out. This is equivalent to emitting uniform light with a certain angular range from the pattern of the pattern light barrier. The pattern is projected by the projection lens group to the far field to form a pattern light.

[0049] Figure 11a The light source device 1119 in Figure 10a is different from the light source device shown in Figure 11a , in that the light source device 1119 in Figure 10bThe light reflecting diaphragm 1109 is divided into a light reflecting area 1109b and a light transmitting area 1109a. The side of the light reflecting area 1109b facing the LED unit array 1101 is reflective. The light from the LED unit array 1101 that enters the light transmitting area 1109a can pass through the light reflecting diaphragm 1109, while the light that enters the light reflecting area 1109b is reflected by the light reflecting area 1109b and at least partially returns to the LED unit array 1101. This part of the reflected light will be recycled and then exit the light transmitting area 1109a. The light transmitting area 1109a is preferably circular and has a diameter less than or equal to the aperture of the converging lens 1119. Since the projection lenses 1153 and 1154 are generally circular in shape, the angle range of the received light is also a circular light cone. As described above, the angular distribution of the light source device 1119 is equivalent to the surface distribution of the light exit surface of the LED unit array 1101, which in this embodiment is a quadrilateral. Therefore, the angular distribution of the light emitted by the light source device 1119 should also be a quadrangular light cone. When this light cone enters the circular projection lens, the light at the four corners of the light cone is wasted. Therefore, in this embodiment, the light reflecting diaphragm 1109 is used to change the light exit surface of the LED unit array 1101 to a circular shape. The reflected light is recycled and then used again, and the final emitted light is efficiently incident on the projection lens. This is equivalent to the previously wasted quadrangular light being partially utilized through the use of the light reflecting diaphragm 1109, thereby improving efficiency. Of course, the light transmitting area of the light reflecting diaphragm 1109 can also be non-circular, which can be designed according to actual conditions.

[0050] In this embodiment, the pattern diaphragm 1156 has a plurality of patterns distributed along its circumferential direction, and further includes a motor. The position of the pattern diaphragm in the light path can be controlled by the motor, thereby controlling which pattern on the pattern diaphragm is projected to the far field to form a patterned light.

[0051] In another embodiment of the present application, the light source device includes at least four LED units, wherein at least one LED unit has a different color of light emission than the other LED units; or at least one LED unit has a different color temperature of white light emission than the other LED units. Figure 10band the explanation, the light of different LED units forms a light spot on the P plane after passing through the converging lens, and the light spots formed by different LED units are theoretically coincident, so the color or color temperature of different LED units is different, and the uniform mixed light spot is formed on the P plane. The advantage is that the brightness of different LED units can be controlled by controlling the driving current, so as to change the color or color temperature of the light, and different LED units can be turned on or off, so as to achieve the purpose of controlling the color of the outgoing light.

[0052] It should be noted that the distinguishing technical features between the embodiments of the present application are not limited to being applied to the respective embodiments, but can be applied to each embodiment. It is impossible to enumerate all possible combinations in the description of the present application, therefore the implementation principle and beneficial effects of each technical feature are illustrated by way of example, and when applied to other embodiments, the person skilled in the art can utilize the implementation principle to achieve the beneficial effects.

[0053] The above is only an embodiment of the present application, and does not limit the patent range of the present application, and any equivalent structure or equivalent process transformation, or direct or indirect application in other related technical fields, is also included in the patent protection range of the present application.

Claims

1. A light source device, characterized in that: The optical axis direction of the light emission direction of the light source device is defined as the Z direction. A plane perpendicular to the Z direction is defined as the principal plane. The +Z direction is defined as the direction along the Z direction that is consistent with the light emission direction of the light source device; the -Z direction is defined as the direction along the Z direction that is opposite to the light emission direction of the light source device. It includes at least four LED units, which are arranged closely together to form an LED unit array; the LED unit array includes a light-emitting surface; Each LED unit includes an LED chip and multiple reflectors. The LED chip is quadrilateral or hexagonal, and the light-emitting surface of the LED chip is parallel to the main plane. Each side of the LED chip is defined as an LED side, and each LED side corresponds to a reflector. Multiple reflectors are adjacent to each other to form a unit light channel. The light-emitting surface of the LED unit array is formed by the close arrangement of the unit light channels of at least four LED units. In any correspondence between an LED edge and a reflector, the reflector curves along a parabolic trajectory in the Z direction and faces the LED edge. The line segments formed by the intersection of the reflector with any first plane are congruent. A plurality of first planes are arranged along the LED edge, each first plane being perpendicular to the LED edge and parallel to the Z direction. The focus of the parabola coincides with the LED edge, and the angle between the axis of the parabola and the Z direction is A, where A < 20 degrees. It also includes a converging lens located at the rear end of the LED unit array optical path, which is used to receive light emitted from the light-emitting surface of the LED unit array and converge it to the P-surface located at the rear end of the converging lens optical path.

2. The light source device according to claim 1, characterized in that, The edge of the reflector in the +Z direction is called the upper edge. In at least one pair of LED edges and reflectors, the angle between the line connecting the LED edge to the upper edge of the reflector and the Z direction is A.

3. The light source device according to claim 1, characterized in that, The edge of the reflector in the -Z direction is called the lower edge. In at least one pair of LED edges and reflectors, the lower edge of the reflector is in contact with the opposite edge of the corresponding LED edge.

4. A lamp, characterized in that, The light source device according to any one of claims 1 to 3 further includes a patterned aperture and a projection lens, wherein the patterned aperture is located near the P-plane of the light source device, and the focal plane of the projection lens coincides with the plane where the patterned aperture is located.

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