A lighting device

Abstract

The present invention provides an illumination device comprising at least two luminous light sources, characterized in that: it further comprises a cylindrical mirror, the cylindrical mirror comprising a cylindrical axis A, the light sources being all arranged on the same side of the cylindrical mirror and emitting light toward the cylindrical mirror, the light emitted by the light sources forming light spots on the cylindrical mirror, the line connecting the non-overlapping light spots formed by the two light sources on the cylindrical mirror being B, the angle between the straight line A and the straight line on which the connecting line B is located being α, 0°<α<90°, and the light emitted by several light sources being converged onto a straight line to form a linear light source.

Description

Technical Field

[0001] The present invention relates to the field of lighting technology, in particular to a light-emitting device that emits a long strip of light and an instrument utilizing the light-emitting device. Background Art

[0002] Conventional lighting devices mostly use circular light spots. However, in special situations or for specialized equipment, a linear light spot is often required. However, the linear light spots used by existing lighting devices are mostly created by adding an aperture to the circular light spot's luminous area, with the aperture emitting a linear beam. While this method can produce a linear light spot, the light emitted by the lighting device is obstructed by the aperture, resulting in low utilization efficiency. Existing technologies do not offer a good method for generating a linear light source.

[0003] The above situation is not the result we want. In order to respond to the national call for green environmental protection, this type of light-emitting device needs to be further optimized. Summary of the Invention

[0004] The purpose of the present invention is to overcome the shortcomings of the above-mentioned traditional technology. In view of the shortcomings of the existing technology, the present invention invents a linear light-emitting device.

[0005] To solve the above problems, the technical solution adopted by the present invention is: a lighting device, comprising at least two light sources, characterized in that: it also includes a cylindrical mirror, the cylindrical mirror includes a cylindrical axis A, the light sources are all arranged on the same side of the cylindrical mirror and emit light toward the cylindrical mirror, the light emitted by the light sources all form light spots on the cylindrical mirror, the line connecting the non-overlapping light spots formed by the two light sources on the cylindrical mirror is B, the angle between the straight line A and the straight line where the connecting line B is located is α, 0°<α<90°.

[0006] As an improvement to the above technical solution: comprising a plurality of the light sources, the light spots formed on the cylindrical mirror by the light emitted by the plurality of the light sources constitute a two-dimensional light spot array, the two-dimensional light spot array includes an X direction and a Y direction, and the plurality of the light spots are periodically arranged along a straight line parallel to the X direction and the Y direction.

[0007] As an improvement to the above technical solution: the cylindrical axis A is not perpendicular to the X direction, and the cylindrical axis A is not perpendicular to the Y direction.

[0008] As an improvement to the above technical solution: the X direction is orthogonal to the Y direction.

[0009] As an improvement to the above technical solution: the period length of the two-dimensional light spot array in the X direction is L, and the period length of the two-dimensional light spot array in the Y direction is H; the two-dimensional light spot array also includes a Z direction, and the angle between the Z direction and the X direction is Q, The angle between the Z direction and the cylindrical axis A of the cylindrical mirror is β, and β≠90°.

[0010] As an improvement to the above technical solution: the period length of the two-dimensional light spot array in the X direction is L, and the period length of the two-dimensional light spot array in the Y direction is H; the two-dimensional light spot array also includes a Z direction, and the angle between the Z direction and the X direction is Q, or n>1, and n is an integer, the angle between the Z direction and the cylindrical axis A of the cylindrical mirror is β, β≠90°.

[0011] As an improvement to the above technical solution: the straight line where the connecting line B of any two light spots lies is not perpendicular to the cylinder axis A.

[0012] As an improvement to the above technical solution: the light spot formed by the light source on the cylindrical mirror is in the shape of an elongated strip, and the angle between the straight line where the elongated strip of light spot is located and the cylindrical axis A is greater than 30° and less than 60°.

[0013] As an improvement to the above technical solution: the angle between the cylindrical axis A and the X direction or the Y direction is greater than 20 degrees and less than 45 degrees.

[0014] As an improvement to the above technical solution: it also includes a light guiding device and a wavelength conversion device, the light guiding device includes two oppositely arranged reflection surfaces, after the light emitted by the cylindrical mirror enters the light guiding device between the two opposite reflection surfaces, at least part of the light is reflected by the light guiding device and then emitted by the light guiding device, the light emitted by the light guiding device excites the wavelength conversion device, and the wavelength conversion device emits stimulated light after being excited.

[0015] Due to the adoption of the above technical solution, compared with the prior art, the present technical solution can converge the light emitted by a plurality of light sources onto a straight line to form a linear light source.

[0016] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a stereogram of a cylindrical mirror.

[0018] Figure 2 This is the optical path schematic.

[0019] Figure 3 This is the optical path schematic.

[0020] Figure 4 This is the optical path schematic.

[0021] Figure 5 This is the optical path schematic.

[0022] Figure 6 This is the optical path schematic.

[0023] Figure 7 It is a stereogram of a cylindrical mirror and a light source.

[0024] Figure 8 This is a top view of the cylindrical mirror and light source.

[0025] Figure 9 It is a top view of the two-dimensional spot array.

[0026] Figure 10 It is a top view of the two-dimensional spot array.

[0027] Figure 11 It is a top view of the two-dimensional spot array.

[0028] Figure 12 It is a top view of the two-dimensional spot array.

[0029] Figure 13 This is a top view of the cylindrical mirror and light source.

[0030] Figure 14 It is a three-dimensional diagram of a lighting device. DETAILED DESCRIPTION

[0031] There are many requirements for lighting devices, such as colorful lighting devices and lighting devices with strip-shaped light spots. We use the following technical solutions to achieve them.

[0032] Example 1:

[0033] like Figure 1-6 As shown, a lighting device includes at least two light sources 102 and a cylindrical mirror 101, wherein the cylindrical mirror 101 includes a cylindrical axis A. The light sources 102 are all arranged on the same side of the cylindrical mirror 101 and emit light toward the cylindrical mirror 101. The light emitted by the light sources 102 forms a light spot on the cylindrical mirror 101. The line connecting the non-overlapping light spots formed by the two light sources 102 is B. The angle between the straight line A and the straight line on which the connecting line B is located is α, and 0°<α<90°.

[0034] Taking two light sources 102 as an example, the purpose of this technical solution is to converge the light emitted by at least two light sources 102 through a cylindrical mirror 101. The distance between the two light spots formed by the light emitted by the two light sources 102 after passing through the cylindrical mirror 101 is less than the distance between the two light sources 102, and the line connecting the two converged light spots is parallel to the cylindrical axis A. Convergence in this technical solution refers to reducing the distance between the two spots, and does not include overlap.

[0035] like Figure 1As shown, the cylindrical mirror 101 in this technical solution is formed by a three-dimensional structure formed by moving a curve along the extension direction of a straight line, where the straight line is the cylindrical axis A of the cylindrical mirror 101. The movement of the curve forms a convex surface, which is referred to as curved surface 101b in the present invention. For ease of description, the curved surface 101b is taken as a cylindrical surface. In this embodiment, the cylindrical mirror 101 also includes a bottom surface 101a connected to the curved surface 101b. For ease of description, the bottom surface 101a is taken as a flat surface. In actual applications, the bottom surface 101a can be a convex surface or a concave surface with a curvature smaller than that of the curved surface 101b (to ensure that the light beams passing through the cylindrical mirror 101 are converged).

[0036] From the above description, it can be seen that cylindrical mirror 101 includes a curved surface 101b and a bottom surface 101a. According to the optical knowledge of cylindrical mirror 101, no matter which side of cylindrical mirror 101 is incident on, it will not affect the effect of the light emitted by cylindrical mirror 101. To facilitate the description of the arrangement of the light spots formed on cylindrical mirror 101 by light emitted by light source 102 before entering cylindrical mirror 101, the light in the present invention is incident from bottom surface 101a and emitted from curved surface 101b. Secondly, in the present invention, it is assumed that light source 102 emits collimated light and that light source 102 emits light toward cylindrical mirror 101.

[0037] According to the above description of the cylindrical mirror 101, the curved surface 101b is a convex curved surface, so the cylindrical mirror 101 acts like a convex lens in optical applications. Figure 2 and Figure 3 As shown, in this embodiment, for consistency of research, it is assumed that the light emitted by each light source 102 enters bottom surface 101a perpendicularly. When light source 102 is located at point a, light source 102 emits first light 121 that reaches bottom surface 101a and forms a light spot. Because bottom surface 101a is flat and the angle of incidence is 0°, first light 121 enters cylindrical mirror 101 perpendicularly to bottom surface 101a and does not refract. When first light 121 exits curved surface 101b, the angle of incidence is greater than 0 due to the curvature of curved surface 101b, so refraction occurs. Furthermore, because first light 121 enters air from cylindrical mirror 101, which typically has a greater refractive index than air, the angle of refraction is greater than the angle of incidence when first light 121 exits curved surface 101b. Therefore, after exiting curved surface 101b, first light 121 forms point a1 on centerline C.

[0038] In order to verify the convergence of the light sources 102 at different positions by the cylindrical mirror 101, as shown in FIG. Figure 2 and Figure 3As shown, we place the light source 102 at point a at point b, which is symmetrical about the cylindrical axis A. The second light 122 emitted by the light source 102 is refracted by the cylindrical mirror 101 (refer to the optical path diagram of the first light 121) and converges at point b1. Points a1 and b1 now coincide.

[0039] When the two light sources 102 converge through the cylindrical mirror 101 to form an overlapping point, it only increases the brightness or light intensity of the light source point, but cannot form the desired linear light spot. Therefore, arranging the two light sources 102 symmetrically about the cylindrical axis A is not what we want. In order to obtain the desired linear light spot, the position of the light source 102 at point b must be changed.

[0040] We assume a straight line D, which passes through point b and is parallel to the cylinder axis A. The light source 102 at point b is moved along the straight line D. Figure 2-5 As shown, take points c and d on line D and analyze the situation when the light source 102 is at point c and point d respectively. When the light source 102 is at point c, according to the description of the first light 121 emitted by the cylindrical mirror 101 in the above description, when the light source 102 is at point c, the third light 123 emitted by the cylindrical mirror 101 converges at point c1. At this time, point a1 and point c1 are on the same line, and point a1 and point c1 do not overlap, as shown in FIG. Figure 2 As shown, inside a right triangle, line segment ac is the length of the triangle's hypotenuse, and line segment a1c1 is the length of one of the triangle's legs. Therefore, the distance between points a1 and c1 is less than the distance between points a and c. The line connecting points a and c is B, and there is an angle between the cylinder axis A and the line connecting line B.

[0041] If the light source 102 is located at point d, the fourth light 124 emitted by the light source 102 converges at point d1 after passing through the cylindrical mirror 101. At this time, a1 and d1 are located on the same straight line. Figure 2 As shown, in a right triangle, the length of line segment ad is the hypotenuse, and the length of line segment a1d1 is one of the right-angled sides of the triangle. Therefore, the distance between points a1 and d1 is less than the distance between points a and d. This is what we want. Line B, which connects points a and d, also has an angle with the cylinder axis A.

[0042] According to geometric principles, the line connecting points a and c is B, and the angle between the cylinder axis A and the line connecting B is α. Therefore, the angle between the line connecting points a and d and the cylinder axis A is 90° + α. For ease of description, the angles in this technical solution are all acute angles between the cylinder axis A and the line connecting B, so α is used to represent them.

[0043] Since we want the distance between the light spots formed after converging through the cylindrical mirror 101 to be smaller than the distance between the light-emitting points, and the line connecting the light spots after converging is parallel to the cylindrical axis A, when the two light sources 102 are both located on the same side of the cylindrical axis A, we introduce a straight line E, where the straight line E passes through point a and is parallel to the cylindrical axis A. The straight line E also includes a point e, and a light source 102 is also provided at point e. The light sources 102 are both located on the straight line E. At this time, the first light 121 emitted by the light source 102 at point a on the straight line E converges at point a1, and the fifth light 125 emitted by the light source 102 at point e converges at point e1. The distance between the two light sources 102 at points a and e is the same as the distance between the light spots formed after passing through the cylindrical mirror 101 and located at points a1 and e1. This is equivalent to simply moving the two light sources 102 in parallel, which does not meet our requirements for converging the light emitted by the light sources 102.

[0044] At this time, the line connecting point a and point e is B, and the angle α between the cylinder axis A and the line connecting line B is 0. Therefore, when α = 0, it does not meet our requirements.

[0045] Furthermore, when α=90°, that is, when the light source 102 is located at point b, the desired linear light spot cannot be obtained, so α=90° does not meet our requirements.

[0046] Only when 0°<α<90° can we obtain the desired linear light spots, and the distance between the formed light spots is smaller than the distance between the two light sources 102 .

[0047] Example 2:

[0048] In Example 1, two light sources are taken as an example to analyze the linear light source we want. The positions of the two light sources and the cylindrical mirror and the angle range between the straight line where the line connecting the two light sources is located and the cylindrical axis A of the cylindrical mirror are obtained. If multiple light sources emit light toward the cylindrical mirror at the same time, and the multiple light sources are placed irregularly, the direction of the cylindrical axis A is no longer restricted. We want to obtain the light spots formed by the light emitted by the multiple light sources 202 after passing through the cylindrical mirror 201 placed in a specific position to converge, and the light spots are twisted onto a straight line after passing through the cylindrical mirror 201. When the light sources 202 are arranged in a disorderly manner, the placement of the cylindrical mirror 201 has no obvious effect on the convergence and twisting of the light emitted by the light source 202, and the desired effect cannot be obtained.

[0049] like Figure 7-13As shown, a lighting device, a preferred embodiment is, including a plurality of light sources 202, the light spots emitted by the plurality of light sources 202 forming on the cylindrical mirror 201 constitute a two-dimensional light spot array, the two-dimensional light spot array includes an X direction and a Y direction, and the plurality of light spots are periodically arranged along a straight line parallel to the X direction and the Y direction.

[0050] According to relevant geometric and optical knowledge, we know that when the light spots formed by the light source 202 on the cylindrical mirror 201 are arranged in a two-dimensional light spot array, the direction of the cylindrical axis A of the cylindrical mirror 201 has a great influence on the light spots finally formed. When the light spots formed by the light source 202 on the cylindrical mirror 201 are arranged in a two-dimensional array, the linear light spots we want can only be obtained after converging through the cylindrical mirror 201 placed at a certain angle. In order to facilitate the description of the two-dimensional light spot array, we define the directions of the two-dimensional light spot array in two dimensions, one of which is the X direction and the other is the Y direction. The X direction and the Y direction are not defined arbitrarily by us. In order to facilitate the description of the two-dimensional light spot array, one of the straight lines of the periodically arranged light spots is parallel to the X direction, and the light spots are periodically arranged along the X direction; the other straight line of the periodically arranged light spots is parallel to the Y direction, and the light spots are periodically arranged along the Y direction. The light source is arranged more neatly using a two-dimensional light spot array, and the linear light spots finally formed are more uniform.

[0051] As can be seen from the above description, the light emitted by light source 202 forms a two-dimensional spot array on cylindrical mirror 201. Since two-dimensional spot arrays can be combined in various ways, for easier explanation of the principle, a preferred embodiment is one in which the X and Y directions are orthogonal. Orthogonal two-dimensional spot arrays provide more regularity when describing angles. Furthermore, a two-dimensional spot array requires accurate spot positioning to achieve the desired linear spot shape. Orthogonal X and Y directions facilitate acquisition and calibration in actual production.

[0052] This embodiment only provides an embodiment in which the X direction is orthogonal to the Y direction. It is not limited to the case in which the X direction is orthogonal to the Y direction. The requirements of this technical solution can be met when there is an acute angle or an obtuse angle between the X direction and the Y direction.

[0053] The purpose of this technical solution is to make the light emitted by several light sources 202 converge and twist through the cylindrical mirror 201 so that the light spots formed by the light emitted by the cylindrical mirror 201 are arranged in a straight line, and the light spots are as uniform as possible. A preferred embodiment is that the cylindrical axis A is not perpendicular to the X direction, and the cylindrical axis A is not perpendicular to the Y direction. According to Example 1, when the light source 202 is located at point a and point b, the light spots formed by the light emitted by the light source 202 after passing through the cylindrical mirror 201 are located at point a1 and point b1, and the line B passing through point a and point b is perpendicular to the cylindrical axis A, and the light spots formed at point a1 and point b1 coincide with each other. If you ultimately want to get as many light spots formed by the light emitted by the cylindrical mirror 201 as possible to be evenly arranged in a straight line, you should avoid the light emitted by the light source 202 focusing on one point after passing through the cylindrical mirror 201. Since the light spots formed by the light emitted by the light source 202 on the cylindrical mirror 201 are periodically arranged in the X and Y directions, the number of light spots in the X and Y directions is relatively large. If the cylindrical axis A is perpendicular to the X direction, the light spots formed by the light emitted by all light sources in the X direction after passing through the cylindrical mirror 201 will all converge at one point. If the cylindrical axis A is perpendicular to the Y direction, the light spots formed by the light emitted by all light sources in the Y direction after passing through the cylindrical mirror 201 will all converge at one point. Therefore, the cylindrical axis A is not perpendicular to the Y direction.

[0054] From the above description, we can see that there are more light spots in the X and Y directions, and we have avoided the situation where the cylindrical axis A is perpendicular to the X and Y directions. However, in a two-dimensional light spot array, the number of light spots in some directions may also be relatively large. In order to make the light spots of the light emitted after passing through the cylindrical mirror 201 not overlap as much as possible, it is necessary to avoid the straight line where the connection line of the multiple light sources 202 is perpendicular to the cylindrical axis A as much as possible. Therefore, we need to determine the direction of the straight line where the connection line of the multiple light sources 202 is located. Figure 8 and Figure 9 As shown, a preferred embodiment is that the period length of the two-dimensional light spot array in the X direction is L, and the period length of the two-dimensional light spot array in the Y direction is H; the two-dimensional light spot array also includes a Z direction, and the angle between the Z direction and the X direction is Q. The angle between the Z direction and the cylindrical axis A of the cylindrical mirror is β, and β≠90°.

[0055] From the above description, it can be seen that in order to arrange the light spots formed by the light emitted by the cylindrical mirror 201 on a straight line and avoid the light spots from overlapping, it is necessary to avoid the cylindrical axis A being perpendicular to a straight line with multiple light spots in the two-dimensional light spot array on the cylindrical mirror 201. To facilitate the description of this straight line, we define the direction of the straight line as Z. To further define the direction of Z, we use the angle Q between the Z direction and the X direction to define the Z direction. Since the Z direction is determined by the connecting lines between the light spots in the two-dimensional light spot array, the angle Q between the Z direction and the X direction is described by using the array period length L of the two-dimensional light spot array in its X direction and the array period length H of the two-dimensional light spot array in its Y direction. Since Z has a direction, there are many situations in which the Z direction meets the requirements.

[0056] In the first Z1 direction, any point in the two-dimensional spot array is the starting point. After moving an array period length L along the X direction and an array period length H along the Y direction, a point is obtained. This point is the end point. The starting point and the end point are connected to obtain a directed line segment M1. The Z1 direction is parallel to the line segment M1 and has the same direction.

[0057] In the second Z2 direction, any point in the two-dimensional spot array is taken as the starting point. After moving an array period length L in the opposite direction of the X direction and an array period length H in the opposite direction of the Y direction, a point is obtained. This point is the end point. The starting point and the end point are connected to obtain a directed line segment M2. The Z2 direction is parallel to the line segment M2 and has the same direction.

[0058] In the third Z3 direction, any point in the two-dimensional spot array is used as the starting point. After moving an array period length L along the X direction and an array period length H in the opposite direction of the Y direction, a point is obtained. This point is the end point. The starting point and the end point are connected to obtain a directed line segment M3. The Z3 direction is parallel to the line segment M3 and has the same direction.

[0059] The fourth direction is Z4. An arbitrary point in the two-dimensional spot array is used as the starting point. After moving an array period length L in the opposite direction of the X direction and an array period length H in the Y direction, a point is obtained. This point is the end point. The starting point and the end point are connected to obtain a directed line segment M4. The Z4 direction is parallel to the line segment M4 and has the same direction.

[0060] In summary, we know that the Z1 direction is parallel to the Z2 direction and in the opposite direction, and the Z3 direction is parallel to the Z4 direction and in the opposite direction. Therefore, we only need the angle β between the cylinder axis A and the Z1 direction or the Z3 direction to be ≠ 90°.

[0061] Since the two-dimensional light spot array has multiple arrangements, the number of light spots in the direction obtained by one period length in the X direction and the Y direction is not the largest. When moving multiple period lengths in the X direction or the Y direction, a method is still needed to describe the angle Q between the Z direction and the X direction. A preferred embodiment is that the period length of the two-dimensional light spot array in the X direction is L, and the period length of the two-dimensional light spot array in the Y direction is H; the two-dimensional light spot array also includes a Z direction, and the angle between the Z direction and the X direction is Q, and the or n>1, and n is an integer, the angle between the Z direction and the cylindrical axis A of the cylindrical mirror is β, β≠90°.

[0062] From the above description, we can know that when the angle or There are still many situations when Z is reversed. n represents the number of light spots arranged periodically in the X direction or Y direction, so n>1 and is a positive integer.

[0063] like Figure 10 As shown, when When , the Z direction is as follows:

[0064] The fifth Z5 direction is to take any point in the two-dimensional spot array as the starting point, move one array period length L along the X direction, and move n array period lengths H along the Y direction to obtain a point, which is the end point. The starting point and the end point are connected to obtain a directed line segment M5. The Z5 direction is parallel to the line segment M1 and has the same direction.

[0065] In the sixth Z6 direction, any point in the two-dimensional spot array is taken as the starting point. After moving one array period length L in the opposite direction of the X direction and n array period lengths H in the opposite direction of the Y direction, a point is obtained. This point is the end point. The starting point and the end point are connected to obtain a directed line segment M6. The Z6 direction is parallel to the line segment M6 and has the same direction.

[0066] The seventh Z7 direction is to take any point in the two-dimensional spot array as the starting point, move one array period length L along the X direction, and move n array period lengths H in the opposite direction of the Y direction to obtain a point, which is the end point. The starting point and the end point are connected to obtain a directed line segment M7. The Z7 direction is parallel to the line segment M7 and has the same direction.

[0067] The eighth direction Z8 is to take any point in the two-dimensional spot array as the starting point, move one array period length L in the opposite direction of the X direction, and move n array period lengths H in the Y direction to obtain a point, which is the end point. The starting point and the end point are connected to obtain a directed line segment M8. The Z8 direction is parallel to the line segment M8 and has the same direction.

[0068] In summary, we know that the Z5 direction is parallel to the Z6 direction and in opposite directions, and the Z7 direction is parallel to the Z8 direction and in opposite directions. Therefore, we only need the included angle β between the cylinder axis A and the Z5 direction or the Z7 direction to be ≠ 90°.

[0069] like Figure 11 As shown, when When , the Z direction is as follows:

[0070] The ninth direction Z9 is to take any point in the two-dimensional spot array as the starting point, move along the X direction by an array period length L, and move along the Y direction by an array period length H to obtain a point, which is the end point. The starting point and the end point are connected to obtain a directed line segment M9. The Z9 direction is parallel to the line segment M9 and has the same direction.

[0071] The tenth type Z 10 Direction: Any point in the two-dimensional spot array is the starting point. Move along the opposite direction of the X direction by an array period length L, and move along the opposite direction of the Y direction by an array period length H to obtain a point. This point is the end point. The starting point and the end point are connected to obtain a directional line segment M. 10 , Z 10 Direction and line segment M 10 Parallel and in the same direction.

[0072] Eleventh Z 11 Direction: Any point in the two-dimensional spot array is the starting point. Move along the X direction by an array period length L, and move along the opposite direction of the Y direction by an array period length H to get a point. This point is the end point. The starting point and the end point are connected to get a directional line segment M. 11 , Z 11 Direction and line segment M 11 Parallel and in the same direction.

[0073] The twelfth type Z 12 Direction, any point in the two-dimensional spot array is the starting point, and after moving an array period length L in the opposite direction of the X direction and an array period length H in the Y direction, a point is obtained. This point is the end point, and the starting point and the end point are connected to obtain a directional line segment M. 12 , Z 12 Direction and line segment M 12 Parallel and in the same direction.

[0074] In summary, the Z9 direction is consistent with the Z 10 The directions are parallel and opposite, Z 11 Direction and Z 12 The directions are parallel and opposite. Therefore, we only need the cylinder axis A and the Z9 direction or Z 11The angle β of the direction is ≠90°.

[0075] As can be seen from the above description, we define the Z direction to avoid the cylindrical axis A being perpendicular to it, where the Z direction is the straight line connecting the multiple light spots formed on the cylindrical mirror 201. In a two-dimensional light spot array, there are multiple Z directions, which increases the difficulty of defining the Z direction. In a preferred embodiment, the straight line B connecting any two light spots is not perpendicular to the cylindrical axis A. When the straight line B connecting any two light spots is not perpendicular to the cylindrical axis A, the light spots in the light emitted by the cylindrical mirror 201 are prevented from overlapping, which better meets our actual needs.

[0076] The description of light source 202 indicates that it emits collimated light, which does not diverge, and the resulting light spots are uniform in size and regularly arranged. However, this is not the case in practice. The light spots formed by light emitted by light source 202 on cylindrical mirror 201 are irregular in shape. In a preferred embodiment, the light spots formed by the light source on the cylindrical mirror are elongated, and the angle between the line defining the elongated light spot and the cylindrical axis A is greater than or equal to 0° and less than 45°.

[0077] In order to obtain a linear light spot, the light source 202 of this technical solution theoretically uses collimated light emitted by a theoretical collimated light source, which is then shaped or twisted by the cylindrical mirror 201 before being emitted. However, the theoretical collimated light source does not exist. In actual production, a laser diode is generally used as the light source 102 for collimated light. The light emitted by the laser diode includes a fast axis direction and a slow axis direction. The fast axis direction and the slow axis direction are perpendicular to each other, and the emission angles in the fast axis direction and the slow axis direction are different. The emission angle in the fast axis direction is greater than the emission angle in the slow axis direction. Therefore, the light spot formed by the laser diode on the cylindrical mirror 101 is an elongated strip.

[0078] like Figure 13 As shown, the linear light spot emitted by the cylindrical mirror 201 runs parallel to the cylindrical axis A of the cylindrical mirror 201. The light spot formed by any light source 202 after being converged by the cylindrical mirror 201 is projected onto the cylindrical axis A of the cylindrical mirror 201. When the angle between the light spot formed by the light source 202 on the cylindrical mirror 201 and the cylindrical axis A of the cylindrical mirror 201 is greater than or equal to 0° and less than 45°, the length of the projected light spot is the longest, and the resulting linear light source is more uniform and coherent. For ease of description, the degrees in this embodiment all use the acute angle between the cylindrical axis A and the light spot.

[0079] To prevent the light spots formed by the two-dimensional light spot array from overlapping after passing through the cylindrical mirror 201, the cylindrical axis A is not perpendicular to the X and Y directions. Due to the large number of light spots in the X or Y direction, even if the cylindrical axis A is infinitely close to perpendicular to the X or Y direction, it still does not meet the requirements. Therefore, simply defining it as non-perpendicular is not sufficient. Secondly, when the X and Y directions are symmetrical about the midline.

[0080] The included angle between the cylindrical axis A and the X direction or the Y direction is greater than 20 degrees and less than 45 degrees.

[0081] Since the light spot formed on the cylindrical mirror 201 is a two-dimensional light spot array, according to the principle of symmetry, the cylindrical axis A and the X-direction or the Y-direction are symmetrical about the centerline between the X-direction and the Y-direction. Therefore, the angle between the cylindrical axis A and the X-direction and the angle between the cylindrical axis A and the Y-direction are symmetrical about the centerline between the X-direction and the Y-direction. Therefore, the angle between the cylindrical axis A and the X-direction or the Y-direction is less than 45 degrees. In addition, when the angle between the cylindrical axis A and the X-direction or the Y-direction is too small, the light spots converged by the cylindrical mirror 201 tend to overlap. Therefore, according to repeated experiments, when the angle between the cylindrical axis A and the X-direction or the Y-direction is greater than 20 degrees, the light spots converged by the cylindrical mirror 201 can effectively avoid overlapping.

[0082] Example 3:

[0083] Examples 1 and 2 describe an illumination device that collects light from multiple light sources into a single strip-shaped light spot. Since the light emitted by this illumination device is a strip-shaped light spot composed of multiple light points, the shape of the light spot changes significantly when transmitted over long distances.

[0084] A lighting device, such as Figure 14 , and also includes a light guiding device and a wavelength conversion device 303. The light guiding device includes two oppositely arranged reflection surfaces. After the shaped light 311 emitted by the cylindrical mirror 301 enters the light guiding device between the two opposite reflection surfaces, at least part of the shaped light 311 is reflected by the light guiding device and then emitted by the light guiding device. The excitation light 312 emitted by the light guiding device excites the wavelength conversion device 303, and the wavelength conversion device 303 is excited to emit the excitation light 313.

[0085] Because the shaped light 311 emitted by the cylindrical mirror 301 has a beam angle, when the shaped light 311 emitted by the cylindrical mirror 301 is transmitted a certain distance and then used to excite the wavelength conversion device 303, the area of ​​the excitation light spot increases, and the area of ​​the stimulated light 313 increases. According to the law of conservation of optical etendue, the light intensity decreases at this time. In order to transmit the shaped light 311 to the wavelength conversion device without expanding the excitation light spot, a light guide device is provided on the light-emitting side of the cylindrical mirror 301. The light guide device includes a light receiving end and a light emitting end. The light receiving end is used to receive the shaped light 311 emitted by the cylindrical mirror 301, and the light emitting end is used to emit excitation light 312 that excites the wavelength conversion device 303. Since the excitation light 312 is used to excite the wavelength conversion device 303, in order to avoid the excitation light 312 from diffusing and increasing the excitation light spot, a preferred embodiment is to have the wavelength conversion device 303 close to the light emitting end.

[0086] The light guide device must be able to both receive and transmit the shaped light 311 while also avoiding expansion of the light spot area during transmission. Therefore, the structure of the light guide device is critical. The light guide device includes two opposing reflective surfaces. For ease of description, one reflective surface is designated as the first reflective surface 304a, and the other as the second reflective surface 304b. In this embodiment, the first reflective surface 304a and the second reflective surface 304b are both planar and disposed opposite each other. The ends of the opposing first reflective surfaces 304a and second reflective surfaces 304b together constitute a receiving end. The elongated shaped light 311 enters the light guide device between the first reflective surface 304a and the second reflective surface 304b. As can be seen from the above description, in order to receive more shaped light 311, a preferred embodiment is to have the elongated direction of the shaped light 311 parallel to the first reflective surface 304a and the second reflective surface 304b, and aligned with the area between the first reflective surface 304a and the second reflective surface 304b. The width of the area between the first reflecting surface 304a and the second reflecting surface 304b is intended to receive and transmit the shaped light 311. Therefore, the width is related to the width of the shaped light 311. In order to receive more shaped light 311 into the light guiding device, the width of the area between the first reflecting surface 304a and the second reflecting surface 304b cannot be less than the width of the shaped light 311.

[0087] After the shaped light 311 enters the area between the first and second reflective surfaces 304a, 304b, a portion of the shaped light 311 with a smaller emission angle travels along the area between the first and second reflective surfaces 304a, 304b to reach the light output end. The other portion of the shaped light 311 with a larger emission angle, after several reflections between the first and second reflective surfaces 304a, 304b, reaches the light output end. The shaped light 311 that reaches the light output end becomes the excitation light 312, which is used to excite the wavelength conversion device 303. The excited wavelength conversion device 303 emits the converted light 313.

[0088] As can be seen from the above description, the purpose of adding a light guide device is to transmit the shaped light 311 from the cylindrical mirror 301 to the wavelength conversion device 303, and the transmission process reduces the size of the light spot formed by the shaped light 311, especially the size in the width direction. Therefore, we use the first reflective surface 304a and the second reflective surface 304b perpendicular to the width direction of the shaped light 311 to reflect and transmit the shaped light 311. When the area of ​​the light output end is reduced, the area of ​​the excitation light 312 will be significantly reduced. A commonly used method is to tilt the first reflective surface 304a and the second reflective surface 304b toward each other to reduce the distance between the first reflective surface 304a and the second reflective surface 304b at the light output end.

[0089] The above detailed description of the specific embodiments of the present invention is for the best mode of implementation of the present invention and is not intended to limit the scope of protection of the present invention. For those skilled in the art, any equivalent modifications and substitutions made to the present invention are also within the scope of protection of the present invention.

Claims

1. A lighting device comprising at least two light sources, characterized in that: Also included is a cylindrical mirror, the cylindrical mirror including a cylindrical axis A, the light sources are all disposed on the same side of the cylindrical mirror and emit light toward the cylindrical mirror, the light emitted by the at least two light sources is converged by the cylindrical mirror, wherein the distance between two light spots formed after the light emitted by any two light sources passes through the cylindrical mirror is smaller than the distance between the any two light sources, and the line connecting the two light spots after convergence is parallel to the cylindrical axis A, wherein convergence refers to reducing the distance between the two light spots and does not include overlap; The light emitted by any two light sources forms non-overlapping light spots on the surface of the cylindrical mirror, the line connecting the two non-overlapping light spots on the surface of the cylindrical mirror is B, and the angle between the cylindrical axis A and the straight line where the line B is located is α, where 0°<α<90°.

2. The lighting device according to claim 1, wherein: The light source comprises a plurality of the light sources, and the light spots formed on the cylindrical mirror by the light emitted by the plurality of the light sources form a two-dimensional light spot array. The two-dimensional light spot array includes an X direction and a Y direction, and the plurality of the light spots are periodically arranged along a straight line parallel to the X direction and the Y direction.

3. The lighting device according to claim 2, characterized in that: The cylindrical axis A is not perpendicular to the X direction, and the cylindrical axis A is not perpendicular to the Y direction.

4. The lighting device according to claim 2, characterized in that: The X direction is orthogonal to the Y direction.

5. The lighting device according to claim 2, characterized in that: The period length of the two-dimensional light spot array in the X direction is L, and the period length of the two-dimensional light spot array in the Y direction is H, wherein the X direction and the Y direction are orthogonal to each other; the two-dimensional light spot array also includes a Z direction, and the angle between the Z direction and the X direction is Q. The angle between the Z direction and the cylindrical axis A of the cylindrical mirror is β, and β≠90°.

6. The lighting device according to claim 2, characterized in that: The period length of the two-dimensional light spot array in the X direction is L, and the period length of the two-dimensional light spot array in the Y direction is H, wherein the X direction and the Y direction are orthogonal to each other; the two-dimensional light spot array also includes a Z direction, and the angle between the Z direction and the X direction is Q. or n>1, and n is an integer, the angle between the Z direction and the cylindrical axis A of the cylindrical mirror is β, β≠90°.

7. The lighting device according to claim 2, characterized in that: The light spot formed by the light source on the cylindrical mirror is in the shape of an elongated strip, and the angle between the extension line of the elongated strip of the light spot and the cylindrical axis A is greater than or equal to 0° and less than 45°.

8. The lighting device according to claim 3, characterized in that: The included angle between the cylindrical axis A and the X direction or the Y direction is greater than 20 degrees and less than 45 degrees.

9. A lighting device according to any one of claims 1 to 8, characterized in that: It also includes a light guiding device and a wavelength conversion device. The light guiding device includes two oppositely arranged first and second reflecting surfaces. The light guiding device includes a light receiving end and a light emitting end. The light receiving end is used to receive the light emitted by the cylindrical mirror, and the light emitting end is used to emit excitation light that excites the wavelength conversion device. After the light emitted by the cylindrical mirror enters the light guiding device between the first and second reflecting surfaces, at least part of the light is reflected by the light guiding device and then emitted by the light guiding device. The light emitted by the light guiding device excites the wavelength conversion device, and the wavelength conversion device emits excited light after being excited.

10. The lighting device according to claim 9, characterized in that: The wavelength conversion device is closely attached to the light output end of the light guide device.

11. The lighting device according to claim 9, characterized in that: The first reflecting surface and the second reflecting surface are inclined towards each other to reduce the distance between the first reflecting surface and the second reflecting surface at the light output end.

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