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 present invention relates to the field of stage lighting, and in particular to a light source device and a lamp using the light source device. Background Art

[0002] In the field of stage lighting, it is necessary to hang the stage light on the top, and the light projected by the stage light needs to form a uniform light spot on the stage. The light spot is generally circular and can also change the pattern. The principle of this stage light is to use a light source device, which has a focal point, and the light energy has a uniform distribution at the focal point. There is a rotatable pattern disk near the focal point, and the pattern disk has multiple hollow patterns along the circumferential direction, such as a circle or a five-pointed star. 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, and a projection lens is used to image the pattern to a distance, so that a uniform pattern light is formed. In such an optical structure, a light source device that can form a uniform light distribution and has a certain divergence angle is an important component and a key component that affects the performance of the lamp. Patents CN204254511U and CN216113489U respectively disclose the technology of using a lens array or a compound eye lens array to shape the discrete light of multiple LEDs into a uniform light spot. The problem with this technology is that it requires the use of multiple lens arrays and compound eye lens arrays, and the smaller the compound eye particles, the higher the uniformity but the higher the cost, that is, the cost and uniformity are contradictory. Therefore, the market needs a more cost-effective uniform light source device solution. Summary of the invention

[0003] In order to solve the problem of high cost of traditional light source devices based on fly-eye lenses, the present invention proposes a light source device, comprising at least four LED units, the four LED units are closely arranged to form an LED unit array; the LED unit array comprises a light emitting surface; each of the LED units comprises an LED chip and a plurality of reflective sheets, the LED chip is quadrilateral or hexagonal, the light emitting surface of the LED chip is parallel to the main plane, and each side of the LED chip corresponds to a reflective sheet one by one; the plurality of reflective sheets are adjacent to each other to form a unit light channel, the light emitting surface of the LED unit array is formed by the The unit light channels of at least four LED units are closely arranged; in the corresponding relationship between any LED edge and the reflector, the reflector is curved in the Z direction with a parabolic trajectory and faces the LED edge, and the reflector 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, A<20 degrees; and also includes a converging lens located at the rear end of the light path of the LED unit array, the converging lens 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 light path of the converging lens. A lamp is also proposed, including the above-mentioned light source device, and also including a pattern aperture and a projection lens, the pattern aperture is located near the P surface of the light source device, and the focal plane of the projection lens coincides with the plane where the pattern aperture is located.

[0004] The unit light channel composed of reflective sheets is used to convert the light emitted by LED chips into uniform surface distribution and uniform angular distribution. Multiple LED units are then spliced ​​into an LED unit array to replace traditional complex optical components such as compound eye lenses. This greatly reduces costs while achieving uniform light spots. At the same time, the uniform angular distribution is converted into uniform surface distribution on the P surface through a converging lens, which improves the uniformity of the lamp. BRIEF DESCRIPTION OF THE DRAWINGS

[0005] Figure 1a It shows a schematic diagram of the optical structure of the LED unit in the first embodiment of the present invention;

[0006] Figure 1b and Figure 1c Respectively expressed Figure 1a A perspective view and a top view of the LED unit shown;

[0007] Figure 2 A three-dimensional diagram showing an LED unit array according to a first embodiment of the present invention;

[0008] Figure 3 A perspective view showing a light source device according to a first embodiment of the present invention;

[0009] Figure 4a It indicated Figure 3The optical structure diagram of the light source device shown is applied to a lamp;

[0010] Figure 4b It indicated Figure 4a A side view of the light source device in the illustrated embodiment in the -Z direction;

[0011] Figure 4c It indicated Figure 4a A schematic diagram of the working principle of the reflective aperture of the light source device in the embodiment;

[0012] Figure 5a A partial enlarged view of a reflective tip in another embodiment is shown;

[0013] Figure 5b Indicates that the application Figure 5a A schematic structural diagram of a light source device of a reflective tip is shown;

[0014] Figure 6a and 6b 3D diagrams of a hexagonal LED unit and a LED unit array thereof in another embodiment are respectively shown;

[0015] Figure 7 A schematic diagram showing the structure of an LED linear array in another embodiment is shown;

[0016] Figure 8 It shows a schematic diagram of the optical structure of a light source device based on a LED linear array applied to a lamp;

[0017] Fig. 9 A schematic diagram showing a far-field light spot in another embodiment is shown;

[0018] Fig.10a shows a schematic structural diagram of a light source device in another embodiment;

[0019] Fig.10b Explained Fig.10a The working principle and optical schematic diagram of the converging lens in the embodiment;

[0020] Fig.11a shows a schematic diagram of the optical structure of a lamp in another embodiment;

[0021] Fig.11b It indicated Fig.11a A side view of the light source device in the embodiment in the -Z direction; DETAILED DESCRIPTION

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

[0023] The present invention provides a light source device, which includes at least four LED units, and the four LED units are closely arranged to form an LED unit array. The LED unit array includes a light-emitting surface. Each LED unit includes an LED chip and a plurality of reflective sheets, the LED chip is quadrilateral or hexagonal, the light-emitting surface of the LED chip is parallel to the main plane, and each edge of the LED chip (hereinafter referred to as LED edge) corresponds to a reflective sheet one by one; the plurality of reflective sheets are adjacent to each other to form a unit light channel, and the light-emitting surface of the LED unit array is formed by closely arranging the unit light channels of at least four LED units.

[0024] The positional relationship between a corresponding LED edge and a reflector is described below in conjunction with FIG. 1. In FIG. 1, the LED chip 101 is a quadrilateral, specifically a regular quadrilateral, one of the edges of which is 101a, and the reflector corresponding to the LED edge 101a is the reflector 102a. The reflector 102a is curved along the Z direction (marked in FIG. 1) in a parabolic trajectory and faces the LED edge 101a. The reflector 102a is congruent in the direction along the LED edge 101a. In other words, the line segments obtained by the intersection of the reflector 102a and any first plane are congruent, that is, the line segments obtained by the intersection are all the same parabolic segments; multiple first planes are arranged along the LED edge, and each first plane is perpendicular to the edge and parallel to the Z direction. Among them, the focus of the parabola coincides with the LED edge 101a, and the angle between the axis 141 of the parabola and the Z direction is A, and A<45 degrees. Observe the three light rays 121a, 122a and 123a emitted from the LED side 101a toward the reflector 102a. Since the reflector 102a is congruent in the direction along the LED side 101a and the focus of the parabola coincides with the LED side 101a, according to the definition of the parabola, the three light rays 121a, 122a and 123a will be emitted along the direction of the axis 141 of the parabola after being reflected by the reflector, that is, the angle between the reflected light rays 121a, 122a and 123a and the Z direction is A. It can be judged that all light rays emitted from the LED side 101a and incident on the reflector 102a will be reflected by the reflector 102a and emitted along the direction of the axis 141. On this basis, observe any light point 101x inside the light-emitting surface of the LED chip that is not on the LED edge 101a. The light 122x emitted from the light point 101x and the light 122a are incident on the same position on the reflector 102a. According to geometric optics, the angle between the exit direction of the light 122x after being reflected by the reflector and the Z direction must be less than A. By extension, the angle between the exit direction of any light incident on the reflector 102a emitted from the light point 101x and reflected by the reflector 102a and the Z direction is less than A. By extension, the angle between the exit direction of any light incident on the reflector 102a emitted from any point on the light-emitting surface of the LED chip and reflected by the reflector 102a and the Z direction is less than or equal to A.

[0025] In the present invention, any corresponding LED edge and reflector sheet satisfy the above-mentioned position relationship. Figure 1b yes Figure 1a A three-dimensional view of the embodiment shown, wherein 103 represents a 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 yes Figure 1a A top view of the embodiment shown, Figure 1c The Z direction is perpendicular to the paper surface. Figure 1a , 1b and 1c, we explain the positional relationship between the other LED edges and reflectors. LED edge 101b corresponds to reflector 102b, LED edge 101c corresponds to reflector 102c, and LED edge 101d corresponds to reflector 102d. According to the working principle of LED edge 101a and reflector 102a described above, the angle between the exit direction of light incident on reflectors 102a, 102b, 102c and 102d from any point on the light-emitting surface of the LED chip and the Z direction after being reflected by the four reflectors 102a, 102b, 102c and 102d is less than or equal to A. Since the multiple reflectors 102a, 102b, 102c and 102d are adjacent to each other to form a unit light channel 102 (as shown in the figure), the light emitted from the LED chip 101 is incident on the inner wall of the light channel 102 and reflected, and the emission direction of the light is less than or equal to A. Therefore, for Figure 1a , 1b For an LED unit shown in FIG1c, by setting the unit light channel 102, the light emitted by the LED chip can be collected in a reflection 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 a light uniforming effect, that is, the light emitted from the LED chip 101 in different directions is reflected by different unit light channels 102 and then overlaps with the light outlet of the unit light channel 102 again, so the light at the light outlet of the unit light channel 102 has a relatively uniform distribution.

[0026] The light source device of the present invention comprises at least four LED units as described above, and the four LED units are closely arranged to form an LED unit array, and the light emitting surface of the LED unit array is formed by closely arranging the unit light channels of at least four LED units. For example, nine LED units are arranged in a 3x3 manner to form an LED unit array. The three-dimensional view of the nine LED units is as follows: Figure 2 As shown, it can be seen that each LED unit is Figure 1b As shown. Since the reflectors are congruent along the direction of the corresponding LED sides, the side walls of the nine LED units can be closely spliced. Since each LED unit can emit light with an angle less than or equal to A, and since the light distribution of the light outlet of the unit light channel of each LED unit is relatively uniform, the light distribution of the spliced ​​light outlet is also relatively uniform. The contour shape of the spliced ​​light-emitting surface is determined by the splicing method of multiple LED units. For example, Figure 2In the embodiment shown, the outline of the light-emitting surface after splicing is a regular quadrilateral (the dotted line 204 in the figure indicates the outline). Of course, there is no light at the splicing seams. Since the reflector has a thickness, the splicing seams between the LED units are inevitable, so absolute uniformity cannot be achieved.

[0027] Therefore, in the present invention, Figure 3 As shown, it also includes a plurality of reflection planes 305a, 305b, 305c, and 305d parallel to the Z direction, and the plurality of reflection planes are adjacent to each other to form a total light channel 305. 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-emitting surface of the LED unit array, and is a regular quadrilateral in this embodiment. In this way, the total light channel 305 is closely connected to the light-emitting surface of the LED unit array and receives the emitted light of the LED unit array. Since the multiple reflection planes 305a, 305b, 305c, and 305d are parallel to the Z direction, the total light channel 305 formed by the adjacent light channels is a light channel parallel to the Z direction. After the part of the light emitted from the light-emitting surface of the LED unit array that enters the light channel is reflected by the multiple reflection planes 305a, 305b, 305c, and 305d, the total light-emitting 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 outlet of the total light channel 305 becomes completely uniform, and the dark line caused by the seam of the light-emitting 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-emitting surface of the LED unit array, the size of the light-emitting 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 present embodiment shown, at the light outlet of the total light channel 305, a uniform light distribution and an outgoing light with a light-emitting angle less than or equal to A are formed. At the same time, compared with the traditional light source device based on a compound eye lens, the present invention does not use a lens, but uses a cheap reflector to control the light, so the cost is greatly reduced. Moreover, in the traditional light source device based on a compound eye lens, since the lens is transmissive, according to optical knowledge, any refraction of light will cause dispersion, which is determined by the material of the lens. However, the reflection effect on the reflector does not cause any dispersion at all, so the outgoing light of the light source device of the embodiment of the present invention also has the advantage of no dispersion.

[0029] In this embodiment, preferably, Figure 1a , 1b and 1c, the edge of the reflector in the -Z direction is called the lower edge, and in the corresponding relationship between at least one pair of LED edges and the reflector, the lower edge of the reflector contacts the opposite edge of the corresponding LED edge. Figure 1aIn the figure, the LED side 101a corresponds to the reflective sheet 102a, and the lower edge of the reflective sheet 102a is in contact with the opposite side 101b of the LED side 101a. The advantage of this is that the areas of the light inlet and the light outlet of the unit light channel are minimized without affecting the aforementioned working principle and achieving the angle of the reflected light being less than or equal to A, thereby ensuring the energy density to the greatest extent. Similarly, LED side 101b corresponds to reflector 102b, and the lower edge of reflector 102b contacts the opposite side 101a of LED side 101b; LED side 101c corresponds to reflector 102c, and the lower edge of reflector 102c contacts the opposite side 101d of LED side 101c; LED side 101d corresponds to reflector 102d, and the lower edge of reflector 102d contacts the opposite side 101c of LED side 101d, that is, the lower edge of each reflector of the unit light channel contacts the opposite side of the corresponding LED side, so that the light inlet of the entire unit light channel is close to the light-emitting surface of the LED, the energy density can be guaranteed to the greatest extent, 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 reflector does not contact the opposite side of the corresponding LED side, that is, there is a gap between the two, it does not affect the working principle and beneficial effects of the aforementioned reflector.

[0030] In this embodiment, preferably, Figure 1a , 1bAs shown in FIG1c, the edge of the reflector in the +Z direction is called the upper edge. In the corresponding relationship between at least one pair of LED edges and the reflector, the angle between the line from the LED edge to the upper edge of the reflector and the Z direction is A. For example, the LED edge 101a corresponds to the reflector 102a, and the angle between the line 142 from the LED edge 101a to the upper edge of the reflector 102a and the Z direction is A. This actually defines the height of the reflector 102a in the Z direction. As mentioned above, the light incident on the LED chip onto the reflector 102a has an angle less than or equal to A with the Z direction after being reflected by the reflector 102a; and the angle between the line 142 from the LED edge 101a to the upper edge of the reflector 102a and the Z direction is A, which ensures that among 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 directly emitted, and the remaining light with an angle greater than A with the Z direction is incident on the reflector 102a and reflected at an angle less than or equal to A. In this way, all the light emitted from the LED edge 101a, regardless of whether it is incident on the reflector 102a, has an angle less than or equal to A with the Z direction. Considering any point 101x on the LED chip, the angle between the line connecting the point 101x and the upper edge of the reflector 102a and the Z direction is less than A. Therefore, the angle between the light emitted from any point on the LED chip, whether it is incident on the reflector 102a or not, and the angle between its emission angle and the Z direction is less than or equal to A. In this way, the angle of all light emitted from the LED chip is completely controlled, that is, it is completely within the angle range less than or equal to A, so that the rear-end lens design becomes simple and more efficient. Of course, even if the angle between the line connecting the LED edge to the upper edge of the corresponding reflector and the Z direction is greater than or less than A, it does not affect the working principle and beneficial effects of the aforementioned reflector. Since A is less than 45 degrees, the light collection half-angle of the rear-end optical system only needs to be less than 45 degrees, which is beneficial and low-cost for the design of the optical system.

[0031] In this embodiment, preferably, at least one reflective plane 305a or 305b or 305c or 305d is integrally formed with the reflective sheet that is closely connected thereto, so that at least in this part, the total light channel is closely connected to the light-emitting surface of the LED unit array without a gap, thereby improving the light transmission efficiency and the uniformity of the light output.

[0032] Figure 4a It indicated that Figure 3 The light source device shown is applied to a light path structure diagram of a lamp. The lamp includes a light source device 451, which is as shown in FIG. Figure 3The light source device shown in the figure also includes a pattern aperture 452 and projection lens groups 453 and 454. In practical applications, in some cases, only one projection lens can be used to realize the function of the projection lens group. Therefore, the term "projection lens" in the present invention refers to a single-piece projection lens and a multi-piece projection lens group. The pattern aperture 452 is located behind the optical path of the total optical channel 405 of the light source device 451. The focal plane of the projection lens coincides with the plane where the pattern aperture 452 is located, so that the light emitted by the light source device 451 can illuminate the pattern on the pattern aperture 452. Since the light outlet of the total optical 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 the pattern on the pattern aperture having a uniform light distribution and emitting light with an angle less than or equal to A. Since the focal plane of the projection lens coincides with the plane where the pattern aperture 452 is located, the pattern of the pattern aperture can be projected far away by the projection lens to form a uniform pattern light spot. Since the light emitted from the pattern has an angle less than or equal to A, the light collection angle of the projection lens only needs to be less than or equal to A, so it is relatively easy to design and implement.

[0033] Figure 4b yes Figure 4a A side view of the light source device 451 and the pattern aperture 452 in the embodiment as viewed from the right side. Figure 4b As shown, in the present embodiment, the pattern aperture 452 is also a reflective aperture 452 covering the light exit port of the total light channel 405, and the reflective aperture 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 is reflective; among the light emitted from the light exit port of the total light channel 405, the part incident on the light-transmitting area 452a can pass through the reflective aperture and emit, and the part incident on the reflective area 452b is reflected by the reflective area and at least partially returns to the total light channel 405 to propagate inwardly. This part of reflected light will pass through the total light channel and the unit light channel and finally be incident on the surface of the LED chip. The LED chip itself is reflective, so this part of light will be reflected again by the LED chip, which is equivalent to being emitted from the LED chip again, and finally emitted from the light outlet of the total light channel, most of which is emitted from the light-transmitting area 452a. Therefore, the reflected light in the reflective area 452b is not wasted, but most of it can be reused, which is equivalent to recycling this part of light. Figure 4c This light recycling mechanism is explained. Figure 4cIn the embodiment, the outgoing light 421 is reflected by the reflective area of ​​the reflective aperture 452 and finally enters the LED chip 401, and is emitted again from the LED chip 401 to form the outgoing light 422. This light recycling mechanism can reduce energy loss and improve efficiency while forming patterned light. In this embodiment, the light-transmitting area is circular, and of course the light-transmitting area can also be other shapes, which can be achieved according to actual needs. In actual applications, the reflective aperture can also be independent of the pattern aperture, and we can even use the pattern aperture and the reflective aperture at the same time. For example, a reflective aperture covering the light outlet of the total light channel is used to form a circular light outlet shape, and a rotatable pattern aperture located at the rear end of the light path of the reflective aperture is used. The pattern aperture has multiple patterns along the circumferential direction, and the pattern can be switched as the pattern aperture rotates.

[0034] In the aforementioned embodiment, the LED units are closely arranged to form an LED unit array, and adjacent LED units must have closely contacting reflective sheets. As mentioned above, since the reflective sheet itself has thickness, the joints between adjacent LED units formed here are non-luminous, thus destroying the uniformity of the light-emitting surface of the LED unit array. In the aforementioned embodiment, a reflective plane and a total light channel composed of the reflective plane are used to solve this unevenness problem, but the cost is that the height of the light source device becomes higher. In the following embodiment, this problem will be optimized.

[0035] A structural schematic diagram of another embodiment of the present invention is shown in FIG. Figure 5b As shown, its local enlarged view is as follows Figure 5a This embodiment is similar to Figure 3There are two differences in the embodiment shown. First, in this embodiment, the edge of the reflector in the +Z direction is called the upper edge; and a reflective tip 507 is also included, which is located at the upper edge seam of the two reflectors 502a and 506a of two adjacent LED units and covers the seam (in other words, the reflective tip 507 is located at the upper edge seam of the two reflectors and covers the seam, wherein the two reflectors (see 502a and 506a in the figure) are the two reflectors located closest to each other on the two adjacent LED units, and the upper edges of the two reflectors are parallel to each other), the side of the reflective tip 507 that contacts the upper edge seam of the reflector is called the wide end 507a, and the other end of the reflective tip 507 is called the tip 507b, the tip 507b is located in the +Z direction of the wide end 507a, and the width of the tip 507b is smaller than that of the wide end 507a. The surface of the reflective tip 507 between the tip and the wide end is reflective. 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 significantly reduce the width of the gap, thereby significantly reducing the length of the total light channel. Second, in this embodiment, 25 LED units are used, which are closely arranged in a 5x5 manner to form an LED unit array.

[0036] In the above embodiments, quadrilateral LED chips are used as examples. In fact, hexagonal LED chips can also be used to implement the LED unit. The schematic diagram of the LED unit using the hexagonal LED chip and its reflector is shown in FIG. Figure 6a As shown, 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 emitting surface of the unit light channel is also hexagonal. In the light source device of this embodiment, seven LED units are included, and these seven LED units are closely arranged in a honeycomb shape to form an LED unit array. The light emitting surface of the LED unit array is also honeycomb-shaped, as shown in FIG. Figure 6b shown. Figure 6b In the illustrated embodiment, the total light channel is not drawn. Compared with the aforementioned quadrilateral light emitting surface, such a honeycomb light emitting surface is closer to a circle, so if the most commonly used circular pattern aperture is used to form a circular pattern light, the light loss is smaller and the efficiency is higher.

[0037] The arrangement of different LED units, in addition to Figure 3 The embodiment shown has a quad array arrangement and Figure 6b The honeycomb arrangement shown can also have other arrangements in practice, which will be described in the following embodiments.

[0038] A structural schematic diagram of another embodiment of the present invention is shown in FIG. Figure 7As shown. Different from the previous embodiment, the light source device in this embodiment includes at least three LED units, and the three LED units are closely linearly arranged to form an LED linear array; the LED linear array includes a light emitting surface. Each LED unit includes an LED chip and multiple reflective sheets. The LED chip is quadrilateral, the light emitting surface of the LED chip is parallel to the main plane, and each side of the LED chip corresponds to a reflective sheet one by one; multiple reflective sheets are adjacent to each other to form a unit light channel, and the light emitting surface of the LED linear array is formed by the closely linear arrangement of the unit light channels of at least three LED units. Specifically, in this embodiment, six LED units 751, 752, 753, 754, 755 and 756 are included, which are closely linearly arranged in sequence. These LED units also include four reflective planes parallel to the Z direction ( Figure 7 The four reflecting planes are adjacent to each other to form a total light channel, and 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, so that the total light channel is closely connected with the light emitting surface of the LED linear array and receives the emitted light of the LED linear array; the light outlet of the total light channel is rectangular.

[0039] Different from the above-mentioned embodiment, the light emitting surface of the light source device of this embodiment is in the shape of a long strip, which is an effect that cannot be achieved by the traditional light source device based on a fly-eye lens described in the background technology. Figure 8 As shown. The lamp also includes projection lens groups 852 and 853, which are used to project the strip-shaped light outlet of the light source device to the far field to form a strip-shaped high-brightness light spot. This is in demand in the actual application of stage lights. In terms of traditional technology, this demand can only be achieved using lasers, while this technology uses LED light source devices, which are lower in cost and safer for human eyes. The longer the length of the strip-shaped light spot required, the better, which requires the number of LED units to be as large as possible, and the longer the long side length 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. In order to solve this problem, in this embodiment, the length of the reflection plane constituting the total light channel in the Z direction is called its height, and the height Hc of the middle part of the two reflection 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 both ends. The advantage of this is that as long as the focus of the projection lens group on its axis coincides with the middle of the long side of the light outlet of the total light channel of the light source device, the middle and edge of the long side of the light outlet of the total light channel can be clearly imaged by the projection lens group.

[0040] use Figure 8The lamp of the embodiment shown can form a bright strip-shaped uniform light spot in the far field. However, due to the limitation of the principle, it can only be a single color. In actual needs, there is a demand for multi-color switchable strip-shaped light spots. Therefore, preferably, the lamp includes at least two Figure 7 The light source device ( Figure 7 The total light channel is not drawn in the figure), the two light source devices are placed side by side along the short side direction of the light outlet of the total light channel; the two light source devices emit different colors of light or the two light source devices emit white light with different color temperatures. The two light source devices form two uniform strips of light in the far field with the same projection lens group, such as Fig. 9 As shown in 981 and 982, the position relationship of the two strip-shaped uniform light bands is arranged 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 aforementioned 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 also the position where the light energy density is the highest. This will bring about a problem, that is, the distance between the light source device and the projection lens (group) is relatively small, thereby limiting the increase of the functions of the lamp. For example, for stage lights, many lighting effects are required, and these lighting effects rely on optical devices between the light source device and the projection lens (group), such as prisms, color filters, etc. These devices themselves require mechanical actions such as rotation and switching to work, so the physical space required is relatively large.

[0042] In order to solve this problem, the present invention also proposes an embodiment, the structural diagram of which is as follows Fig.10a As shown. In this 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 includes a light-emitting surface. Each LED unit includes an LED chip and a plurality of reflective sheets. 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 corresponds to a reflective sheet one by one. The plurality of reflective sheets are adjacent to each other to form a unit light channel, and the light-emitting surface of the LED unit array is formed by closely arranged unit light channels of at least four LED units. In the corresponding relationship between any LED edge and the reflective sheet, the reflective sheet is bent in the Z direction with a parabolic trajectory and faces the LED edge, and the reflective 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. With Figure 3 The differences in the illustrated embodiment include three points.

[0043] First, this embodiment further includes a converging lens 1012 located at the rear end of the light path of the LED unit array 1011, and the converging lens 1012 is used to receive the light (taking the light 1021 as an example) emitted from the light emitting surface of the LED unit array 1011 and converge it to the P surface located at the rear end of the light path of the converging lens 1012. Figure 1a The explanation of the working principle of the reflector and the LED unit is that the light emitted from the LED side 101a is reflected by the reflector 102a and becomes the light emitted along the A direction (the A direction here refers to the direction in Figure 1a The light emitted from the LED edge 101b is reflected by the reflector 102b and then becomes the light emitted in the direction of A (the direction of A here refers to the direction of Figure 1a The light emitted from any point 101x on the LED chip, whether it is incident on the reflector 102a or the reflector 102b, is equivalent to the light emitted from a point deviating from the focus of the parabola, so most of the reflected light is concentrated near a specific angle less than A. Therefore, it can be judged that the role of the unit light channel is to roughly transform the surface distribution of the LED chip into the angular distribution of the emitted light. And because 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. Combined with the previous description, that is to say, the surface distribution and angular distribution of the light emitted from the unit light channel are basically uniform, which is determined by the characteristics of the LED chip and the characteristics of the unit light channel of the present invention.

[0044] Combine the following Fig.10b The working principle of the converging lens is explained. In order to express the angle of light incident on the converging lens 1012, Fig.10b In the embodiment, the LED unit array 1011 and the converging lens are intentionally separated by a certain distance. In practice, this distance may not exist. Consider a beam of light 1022 emitted from the edge of the LED unit array. It has a certain divergence half angle A and is incident on 1012. Fig.10bIn the figure, three rays are used to represent different angles of the light beam 1022. The converging lens 1012 has a certain bending ability for light, so the three rays of the light beam 1022 have the same twist angle after passing through the converging lens 1012. Therefore, when incident on the P surface, a light spot 1024 with a certain width is formed. The upper edge of the light spot 1024 corresponds to the light at the uppermost angle of the light beam 1022, the lower edge of the light spot 1024 corresponds to the light at the lowermost angle of the light beam 1022, and the center of the light spot 1024 corresponds to the light at the center angle of the light beam 1022. It can be seen that the angular distribution of the light beam 1022 becomes the surface distribution on the P surface after passing through the converging lens 1012. Let's examine the light beam 1023 emitted from the position near the middle of the LED unit array. Similar to the situation of the light beam 1022, the light beam 1023 also forms a light spot on the P surface that overlaps with the light spot 1024 after passing through the converging lens 1012. The surface distribution of the light spot is also equivalent to the angular distribution of the light beam 1023. Therefore, the function of the converging lens 1012 is to convert the surface distribution of light emitted from the light emitting surface of the LED unit array into the angular distribution of converged light, and at the same time convert the angular distribution of light emitted from the light emitting surface of the LED unit array into the surface distribution on the P surface.

[0045] Since the angular distribution of the output light of each LED unit is basically uniform, the convergent light spot formed on the P surface after being converged by the converging lens 1012 is also basically uniform; at the same time, the convergent light beam begins to diverge after passing through the P surface, and the divergence angle is determined by the surface shape of the converging lens 1012, so the numerical range of the divergence angle can be achieved as needed, thereby achieving the purpose and beneficial effects of the invention.

[0046] Second, this embodiment does not necessarily include Figure 3 The total number of optical channels in the embodiment shown. Figure 3 In the embodiment shown, the purpose of setting the total light channel is to eliminate the joints between the LED units, so as to achieve uniform surface distribution on the light-emitting surface of the total light channel. As mentioned above, in this embodiment, the surface distribution of light energy on the P surface is not affected by the joints between the LED units, but is determined by the angular distribution of the light emission of the LED units. Therefore, the total light channel is not necessarily required in this embodiment. Of course, the use of 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 converged light, which will also help the light quality of the lamp; and the use of the total light channel is conducive to completely coupling the light emitted by the LED unit into the converging lens, thereby improving efficiency. Therefore, it may also be used in actual use.

[0047] Third, in this embodiment, A<20 degrees. This is because, in order to achieve good working of the converging lens, the divergence angle of the incident light should be relatively small. The inventors have concluded through repeated practice that A less than 20 degrees is a better range in practice and can achieve good results.

[0048] In summary, on the P plane of this embodiment, a uniform surface distribution is formed, and at the same time, light with a certain controllable angular distribution is formed. Fig.11a Indicates the application Fig.10a The schematic diagram of the optical path of the lamp made of the light source device of FIG. 1 includes the light source device 1119, the pattern aperture 1156 and the projection lenses 1153 and 1154. The pattern aperture 1119 is located near the P surface of the light source device 1119, and the focal plane of the projection lens group coincides with the plane where the pattern aperture 1156 is located. The uniform light spot formed by the light source device 1119 on the P surface illuminates the pattern aperture, and the pattern of the pattern aperture is projected, which is equivalent to emitting uniform light with a certain angle range from the pattern of the pattern aperture, and the pattern is projected to the far field by the projection lens group to form pattern light.

[0049] Fig.11a The light source device 1119 and Fig.10a The light source arrangement shown differs in that Fig.11a The light source device 1119 in the embodiment further includes a reflective aperture 1109 covering the light emitting surface of the LED unit array 1101. The side view of the LED unit array 1101 and the reflective aperture 1109 along the -Z direction is shown in FIG. Fig.10bAs shown. The reflective aperture 1109 is divided into a reflective area 1109b and a translucent area 1109a, wherein the side of the reflective area 1109b facing the LED unit array 1101 is reflective; among the light emitted from the light-emitting surface of the LED unit array, the part incident on the translucent area 1109a can pass through the reflective aperture and emit, and the part incident on the reflective area 1109b is reflected by the reflective area and at least partially returns to the interior of the LED unit array. This part of the reflected light will be emitted from the translucent area 1109a again after the effect of light recycling. This principle has been mentioned before and will not be repeated here. Preferably, the translucent area 1109a is circular, and the diameter of the circle is less than or equal to the aperture of the converging lens 1119. Because the projection lenses 1153 and 1154 generally use a circular shape, the angle range of the received light is also a circular light cone. As mentioned above, the angular distribution of the light source device 1119 is equivalent to the surface distribution of the light emitting surface of the LED unit array. In this embodiment, the outline of the surface distribution is a quadrilateral, so the luminous angle distribution of the light source device 1119 should also be a quadrangular cone. When this light cone is incident on the circular projection lens, the light at the four corners will be wasted. Therefore, in this embodiment, the light from the light outlet of the ED unit array 1101 is changed into a circle by using the reflection aperture 1109, and the reflected light will be reused due to the light recycling effect, and the final emitted light will be efficiently incident on the projection lens. This is equivalent to the original wasted light at the four corners being partially utilized by placing the reflection aperture 1109 and through the light recycling effect, thereby improving efficiency. Of course, the light transmission area of ​​the reflection aperture 1109 may not be circular, which can be designed according to actual conditions.

[0050] In this embodiment, the pattern aperture 1156 has a plurality of patterns distributed along its circumferential direction, and also includes a motor, which can be used to control the position of the pattern aperture on the optical path, thereby controlling which pattern on the pattern aperture is projected into the far field to form pattern light.

[0051] In another embodiment of the present invention, the light source device comprises at least four LED units, wherein the light color of at least one LED unit is different from the light colors of the other LED units; or the color temperature of white light emitted by at least one LED unit among the at least four LED units is different from the color temperature of white light emitted by the other LED units. Fig.10bAccording to the explanation, the light from different LED units forms a light spot on the P surface after passing through the converging lens. The light spots formed by different LED units are theoretically overlapped. Therefore, different LED units with different colors or color temperatures will be mixed on the P surface to form a uniform mixed light spot. The advantage of this is that the brightness of different LED units can be controlled by controlling the driving current, thereby changing the color or color temperature of the light, and the color of the emitted light can be controlled by turning off or on different LED units.

[0052] It should be noted that the distinguishing technical features between the various embodiments of the present invention are not limited to being applied to their respective embodiments, but can be applied to various embodiments. It is impossible to list all possible combinations in the description of the present invention. Therefore, the implementation principles and beneficial effects of various technical features are explained by way of examples. When applied to other embodiments, personnel in this technical field will use their implementation principles to achieve the beneficial effects.

[0053] 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 light source device, characterized in that: The optical axis direction of the light emitting direction of the light source device is defined as the Z direction, 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; It comprises at least four LED units, which are closely arranged to form an LED unit array; the LED unit array comprises a light emitting surface; Each of the LED units comprises an LED chip and a plurality of reflective sheets, the LED chip is quadrilateral or hexagonal, the light-emitting surface of the LED chip is parallel to the main plane, and each side of the LED chip (LED side) corresponds to a reflective sheet one by one; the plurality of reflective sheets are adjacent to each other to form a unit light channel, and the light-emitting 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 LED edge and the reflector, the reflector is bent in a parabolic trajectory in the Z direction and faces the LED edge, the line segments obtained by the intersection of the reflector and any first plane are congruent, and multiple first planes are arranged along the LED edge, each of which is perpendicular to the LED edge and parallel to the Z direction; 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, and A<20 degrees; It also includes a converging lens located at the rear end of the light path of the LED unit array, which is used to receive light emitted from the light emitting surface of the LED unit array and converge it on the P surface located at the rear end of the light path of the converging lens.

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 the corresponding relationship between at least one pair of LED edges and the reflector, the angle between the line from 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 the corresponding relationship between at least one pair of LED edges and the reflector, the lower edge of the reflector contacts the opposite edge of the corresponding LED edge.

4. The light source device according to claim 1, characterized in that: It also includes a reflective diaphragm covering the light-emitting surface of the LED unit array, and the reflective diaphragm is divided into a reflective area and a light-transmitting area, wherein the side of the reflective area facing the LED unit array is reflective; among the light emitted from the light-emitting surface of the LED unit array, the part incident on the light-transmitting area can pass through the reflective diaphragm and emit, and the part incident on the reflective area is reflected by the reflective area and at least partially returns to the interior of the LED unit array.

5. The light source device according to claim 4, characterized in that: The light-transmitting area is circular, and the diameter of the circle is less than or equal to the aperture of the converging lens.

6. The light source device according to claim 1, characterized in that: The edge of the reflective sheet in the +Z direction is called the upper edge; it also includes a reflective tip, which is located at the upper edge seam of the two reflective sheets of two adjacent LED units and covers the seam, the side of the reflective tip that contacts the upper edge seam of the reflective sheet is called the wide end, and the other end of the reflective tip is called the tip, which is located in the +Z direction of the wide end, and the width of the tip is smaller than that of the wide end; the surface of the reflective tip between the tip and the wide end is reflective.

7. The light source device according to claim 1, characterized in that: Among the at least four LED units, at least one LED unit emits light of a color different from that of the other LED units; or among the at least four LED units, at least one LED unit emits white light of a color temperature different from that of the other LED units.

8. The light source device according to claim 1, characterized in that: It also includes a plurality of reflective planes parallel to the Z direction, which are adjacent to each other to form a total light channel, and the cross-sectional shape of the total light channel on the main plane is the same as the outer contour of the light emitting surface of the LED unit array, so that the total light channel is closely connected with the light emitting surface of the LED unit array and receives the emitted light of the LED unit array.

9. A lamp, characterized in that: The light source device comprises the light source device according to any one of claims 1 to 8, and further comprises a pattern aperture and a projection lens, wherein the pattern 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 pattern aperture is located.

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