Optical module and luminaire

Abstract

The application provides an optical module and a lamp, the optical module comprises a first lens and a second lens which are connected with each other, the first lens has a first light inlet surface arranged towards a light source and a first light outlet surface arranged opposite to the first light inlet surface, the second lens has a second light inlet surface abutting against the first light outlet surface and a second light outlet surface arranged opposite to the second light inlet surface, the second light outlet surface is recessed from the center position towards the second light inlet surface, and a first convex part and a second convex part arranged around the first convex part are arranged at the recessed position, part of the light emitted by the light source is refracted out through the first convex part and the second convex part, and the other part is refracted out from the remaining part of the second light outlet surface after at least one reflection. Compared with the prior art, the application can eliminate the secondary light spot and glare generated by the lamp, reduce the stray light and improve the overall light efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to an optical module and a lamp, belonging to the technical field of lighting. BACKGROUND

[0002] Since the existing optical lens is assembled in the shell of the lamp, a large amount of stray light generated by the lens is scattered in the lamp, causing loss of light energy, so that the efficiency of the lens is about 85%, which is difficult to further improve.

[0003] Therefore, it is necessary to provide an optical module and a lamp to solve the above problems. SUMMARY

[0004] The present application aims to provide an optical module and a lamp, which can improve the light efficiency.

[0005] To achieve the above-mentioned purpose, the present application provides an optical module, comprising a first lens and a second lens connected with each other, the first lens having a first light entrance surface arranged towards a light source and a first light exit surface arranged opposite to the first light entrance surface, the second lens having a second light entrance surface abutting against the first light exit surface and a second light exit surface arranged opposite to the second light entrance surface, the second light exit surface being recessed from the center position thereof towards the second light entrance surface, and a first protruding portion and a second protruding portion arranged around the first protruding portion being arranged at the recessed portion, a part of the light emitted by the light source being refracted out through the first protruding portion and the second protruding portion, and another part being refracted out from the remaining part of the second light exit surface after being reflected at least once.

[0006] As a further improvement of the present application, the first protruding portion is a curved surface protruding in the light exit direction.

[0007] As a further improvement of the present application, the second protruding portion comprises a first side surface and a second side surface, the first side surface being connected between the second side surface and the first protruding portion, and the second side surface having a larger area of orthogonal projection on a horizontal plane than the first side surface.

[0008] As a further improvement of the present application, a third protruding portion is further arranged on the second light exit surface, the third protruding portion being arranged around the outside of the second protruding portion.

[0009] As a further improvement of the present application, the first light entrance surface, the first light exit surface, the second light entrance surface, the second light exit surface, the first protruding portion and the second protruding portion are all centrally symmetrical about the same axis.

[0010] As a further improvement of the present application, the first light exit surface and the second light entrance surface are both curved surfaces, and the first light exit surface is convex towards the second lens along the light exit direction, and the second light entrance surface is concave inwards along the light exit direction.

[0011] As a further improvement of the present application, the side surface of the second lens has a first reflection surface and a second reflection surface, the first reflection surface is located between the first lens and the second reflection surface, and the second reflection surface is provided with a sawtooth structure for dispersing the light emitted by the light source on the second reflection surface.

[0012] As a further improvement of the present application, the second reflection surface is provided with a first opening and a second opening, wherein the radius of the first opening is smaller than the radius of the second opening, and the first reflection surface is arranged around the first opening and connected to the second reflection surface through the first opening.

[0013] As a further improvement of the present application, the cross-sectional profile of the first reflection surface gradually increases along the light exit direction, the cross-sectional profile of the second reflection surface gradually increases along the light exit direction, and the increasing amplitude of the cross-sectional profile of the second reflection surface is greater than that of the first reflection surface.

[0014] To achieve the above-mentioned purpose, the present application provides a lamp comprising a light source module and an optical module as described above, wherein the first lens is arranged closer to the light source than the second lens.

[0015] The present application has the advantages of eliminating the secondary light spots and glare generated by the lamp, reducing stray light and improving the overall light efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a structural schematic diagram of the optical module of the present application.

[0017] Figure 2 is a cross-sectional structural schematic diagram of the optical module of the present application.

[0018] Figure 3 is Figure 2 is an enlarged structural schematic diagram of A in FIG.

[0019] Figure 4 is a cross-sectional structural schematic diagram of the optical module of the present application.

[0020] Figure 5 is a light path structural schematic diagram of the optical module of the present application. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application will be described in detail below with reference to the drawings and specific embodiments.

[0022] It should be noted that, in order to avoid obscuring the present application with unnecessary details, only the structures and / or processing steps closely related to the solution of the present application are shown in the drawings, while other details not closely related to the present application are omitted.

[0023] It should also be noted that the terms "comprising", "containing", or any other similar term are intended to encompass non-exclusive inclusions, such that a process, method, article, or apparatus that comprises a list of elements does not necessarily include only those elements in the list, but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0024] As shown in Figures 1 to 5 The present application discloses a lamp, which comprises a light source module and an optical module 100, the light source module comprises a light source plate and a light source arranged on the light source plate, and the optical module 100 is a lens and is used for covering the light source, so as to improve the overall light efficiency of the lamp. In order to describe clearly, the following part of the description will be described in detail taking the lamp as an example.

[0025] As shown in Figure 1 The optical module 100 comprises a first lens 10 and a second lens 20, the first lens 10 is arranged close to the light source compared with the second lens 20, and the light emitted by the light source is refracted out of the second lens 20 after passing through the first lens 10.

[0026] The first lens 10 is made of silica gel, the first lens 10 has a first light-in surface 11 and a first light-out surface 12, the first light-in surface 11 is arranged towards the light source, and the first light-in surface 11 is a plane, the first light-out surface 12 is arranged towards the second lens 20, and the first light-out surface 12 is opposite to the first light-in surface 11, preferably, the first light-out surface 12 is a curved surface and is convexly arranged along the light-out direction of the light source, so as to make the first lens 10 a convex lens. In other embodiments of the present application, the first light-in surface 11 can also be formed with a light source cavity for accommodating the light source, so as to reduce the light leakage of the light source.

[0027] The second lens 20 is made of plastic, the second lens 20 has a second light-in surface 21 and a second light-out surface 22, the second light-in surface 21 is arranged towards the first light-out surface 12, and the second light-out surface 22 is arranged opposite to the second light-in surface 21, wherein the second light-in surface 21 is preferably a curved surface matched with the first light-out surface 12, and the second light-in surface 21 is recessed inwardly along the light-out direction of the second lens 20.

[0028] Preferably, the first lens 10 and the second lens 20 are connected to each other, i.e. the first light exit surface 12 and the second light entrance surface 21 are in abutment by means of a concave-convex fit, wherein the first light exit surface 12 and the second light entrance surface 21 can be free curved surfaces, so that the light emitted by the light source passes through the first light entrance surface 11, the first light exit surface 12, the second light entrance surface 21 and the second light exit surface 22 in turn, and is finally refracted out of the second light exit surface 22. In particular, the rotation centers of the first lens 10 and the second lens 20 are located on the same axis, i.e. taking the plane perpendicular to the light exit direction as the horizontal plane, the orthographic projections of the first light entrance surface 11, the first light exit surface 12, the second light entrance surface 21 and the second light exit surface 22 in the horizontal direction are all circular, and the first light entrance surface 11, the first light exit surface 12, the second light entrance surface 21 and the second light exit surface 22 are all centrosymmetric about the same axis.

[0029] In order to further improve the light efficiency of the optical module 100, the second light exit surface 22 is concave, and since the second light entrance surface 21 is a concave curved surface, the second lens 20 is a concave lens as a whole, and the cross-sectional area of the second lens 20 gradually increases along the light exit direction. The second light exit surface 22 is concave from the center position thereof towards the second light entrance surface 21, and the horizontal height of the second light exit surface 22 at the center gradually increases outward along the radial direction, so that the second light exit surface 22 is in the shape of a horn with a large opening.

[0030] Further, the center of the second light exit surface 22 is provided with a first protruding portion 23, the orthographic projection of the first protruding portion 23 in the horizontal direction is circular, the surface of the first protruding portion 23 is connected to the second light exit surface 22 and forms a convexly arranged curved surface along the light exit direction, so that the light rays at the center of the optical module 100 are uniformly dispersed.

[0031] The first protruding part 23 is provided with a second protruding part 24, the second protruding part 24 is in the shape of a triangular prism and surrounds the first protruding part 23, the second protruding part 24 comprises a first side surface 241 and a second side surface 242, wherein the first side surface 241 is arranged to be close to the first protruding part 23, the second side surface 242 is arranged at the outer periphery of the first side surface 241, so that the first side surface 241 is located between the second side surface 242 and the first protruding part 23, the area of the second side surface 242 in the horizontal plane is greater than the area of the first side surface 241 in the horizontal plane, that is, the surface area of the second protruding part 24 close to the center of the second light emitting surface 22 is smaller, so as to weaken the light distribution of the light source to the center of the optical module 100, so that more light is distributed to the outer periphery of the optical module 100 through the second side surface 242, and the specific ratio of the first side surface 241 and the second side surface 242 can be set as required, and is not limited herein.

[0032] It can be understood that the central axes of the first protruding part 23 and the second protruding part 24 are consistent, and are symmetric about the same axis center.

[0033] In combination Figure 5 As shown, the outer periphery of the second protruding part 24 is further provided with a third protruding part 25, the third protruding part 25 is also in the shape of a triangular prism and surrounds the second protruding part 24, similarly, the third protruding part 25 comprises a third side surface 251 and a fourth side surface 252, wherein the third side surface 251 is arranged to be close to the second protruding part 24, the fourth side surface 252 is arranged at the outer periphery of the third side surface 251, so that the third side surface 251 is located between the fourth side surface 252 and the second protruding part 24, and the area of the fourth side surface 252 in the horizontal plane can be slightly greater than the area of the third side surface 251 in the horizontal plane, so as to weaken the light at the center of the optical module 100, and the role of the third protruding part 25 is the same as that of the second protruding part 24. It needs to be noted that since the light at the center of the optical module 100 has been weakened by the first protruding part 23 and the second protruding part 24, the third protruding part 25 does not need to excessively weaken the light at the center of the optical module 100 again, that is, the difference between the areas of the third side surface 251 and the fourth side surface 252 in the horizontal plane is less than the difference between the areas of the first side surface 241 and the second side surface 242 in the horizontal plane, so as to prevent the imbalance of the light at the outer periphery of the optical module 100, thereby avoiding the generation of secondary light spots and preventing glare, and the specific ratio can be set as required.

[0034] It can be understood that the third protruding part 25 is also centrally symmetrical with the first protruding part 23 and the second protruding part 24 about the same axis. Of course, the third protruding part 25 can be further provided with a fourth protruding part or more, which is not limited in particular. The first protruding part 23, the second protruding part 24 and the third protruding part 25 can disperse the light emitted by the light source on the second light emitting surface 22.

[0035] It needs to be explained that the light emitted by the light source is divided into two parts after passing through the first lens 10, one part can be refracted out through the first protruding part 23, the second protruding part 24 and the third protruding part 25, and the other part needs to be reflected and refracted out from the second light emitting surface 22.

[0036] As shown in the drawings, Figures 2 to 3 In other embodiments of the present application, the side surface of the second lens 20 has a first reflecting surface 26 and a second reflecting surface 27, the first reflecting surface 26 and the second reflecting surface 27 are both arranged around the second light emitting surface 22, the first reflecting surface 26 is located between the first lens 10 and the second reflecting surface 27, and the second reflecting surface 27 is surrounded to form a first opening and a second opening, wherein the radius of the first opening is smaller than the radius of the second opening, the first reflecting surface 26 is arranged around the first opening and connected with the second reflecting surface 27 through the first opening, that is, in the light emitting direction, the cross-sectional profile of the first reflecting surface 26 gradually increases, the cross-sectional profile of the second reflecting surface 27 also gradually increases, and the increasing amplitude of the cross-sectional profile of the second reflecting surface 27 is greater than that of the first reflecting surface 26, so that the first reflecting surface 26 and the second reflecting surface 27 are discontinuous in the vertical direction, and the first reflecting surface 26 and the second reflecting surface 27 can be free-form surfaces. The first reflecting surface 26 is used for reflecting the incident light from the first lens 10 to the second light emitting surface 22.

[0037] It needs to be explained that the first reflecting surface 26 is a total reflecting surface and adopts a TIR architecture. In a plane rectangular coordinate system, two unit vectors i and j in the same direction as the x-axis and y-axis are taken as a group of bases. A vector a is made from the coordinate origin O to the terminal point P, and a is an arbitrary vector in the plane rectangular coordinate system.

[0038] According to the plane vector basic theorem, there is and only one pair of real numbers (x, y) such that a = xi + yj, so the real number pair (x, y) is called the coordinates of the vector a, denoted as a = (x, y), which is the coordinate representation of the vector a. Where (x, y) is the coordinates of the point, and the vector a is called the position vector of the point P.

[0039] Setting the light source as the origin, the outgoing light rays of the light source can be represented by the linear algebra y=tan(theta)x, and the vector expression of the incident light rays can be written by the curve equation (cos(theta), sin(theta)), wherein theta is the angle of the incident light rays, and the direction vector of the target outgoing light rays is known, and the vector representation of the refraction law is known

[0040]

[0041] The normal vector of the first reflecting surface 26 on the specified incident light rays can be obtained.

[0042] By specifying the coordinates of the initial point, using Euler's mathematical approach, combining the above formulas, using the excel tool, the coordinate points of the free surface of the first reflecting surface 26 are obtained, which are imported into the cad, and the free curve command is used to connect the coordinate points to obtain the curve data of the first reflecting surface 26.

[0043] The second reflecting surface 27 is used to reflect the incident light rays from the first lens 10 and the light rays reflected by the second light emitting surface 22, so that they are emitted to the second light emitting surface 22, and finally the light efficiency of the optical module 100 reaches 95%. The second reflecting surface 27 is provided with a sawtooth structure 271, the sawtooth structure 271 includes a plurality of strip-shaped splines, the sawtooth structure 271 is used to disperse the light rays emitted by the light source on the second reflecting surface 27, the splines are provided outwardly protruding from the second reflecting surface 27, of course, the sawtooth structure 271 can also be a groove formed inwardly recessed on the second reflecting surface 27, and the specific limitation is not limited. The splines extend obliquely along the surface of the second reflecting surface 27 in the vertical direction, since the second reflecting surface 27 is arranged around, the splines are arranged around the second reflecting surface 27, and the included angle between adjacent splines can be ignored, so that the adjacent splines are approximately parallel.

[0044] In combination Figure 5 As shown in the figure, the incident light rays from the first lens 10 are partially emitted directly after entering the second lens 20, and the other parts are respectively emitted to the first reflecting surface 26 and the second light emitting surface 22, the light rays emitted to the first reflecting surface 26 are reflected to the second light emitting surface 22, and the light rays directly emitted to the second light emitting surface 22 are mixed, the light rays with an incident angle less than the critical angle are directly refracted from the second light emitting surface 22, and the light rays with an incident angle greater than or equal to the critical angle are continuously reflected by the second light emitting surface 22, and part of the light rays are reflected to the second reflecting surface 27 and dispersed to the second light emitting surface 22 through the sawtooth structure 271, and this continues until the light rays are completely emitted.

[0045] In summary, the present application can eliminate the secondary light spots and glare generated by the lamp, reduce the stray light and improve the overall light efficiency.

[0046] The above examples are only used to illustrate the technical solutions of the present application but not to limit the present application. Although the present application is described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or equivalently replaced, without departing from the spirit and scope of the present application.

Claims

1. An optical module, characterized by: The lens comprises a first lens (10) and a second lens (20) connected with each other, the first lens (10) has a first light-in surface (11) arranged towards a light source and a first light-out surface (12) arranged opposite to the first light-in surface (11), the second lens (20) has a second light-in surface (21) abutting against the first light-out surface (12) and a second light-out surface (22) arranged opposite to the second light-in surface (21), the second light-out surface (22) is recessed from a center position thereof towards the second light-in surface (21), and the second light-out surface (22) is provided with a first protruding part (23), a second protruding part (24) arranged around the first protruding part (23), and a third protruding part (25) arranged around the second protruding part (24), a part of light emitted by the light source is refracted out through the first protruding part (23) and the second protruding part (24), and another part of the light is refracted out from a remaining part of the second light-out surface (22) after at least one reflection. The second protruding part (24) comprises a first side surface (241) and a second side surface (242), the third protruding part (25) comprises a third side surface (251) and a fourth side surface (252), and a difference between areas of the third side surface (251) and the fourth side surface (252) in a horizontal plane is less than a difference between areas of the first side surface (241) and the second side surface (242) in the horizontal plane.

2. The optical module according to claim 1, characterized by: The first protruding part (23) is a curved surface protruding in a light-out direction.

3. The optical module of claim 1, wherein: The first side surface (241) is connected between the second side surface (242) and the first protruding part (23), and an area of the second side surface (242) in a horizontal plane is greater than an area of the first side surface (241) in the horizontal plane.

4. The optical module of claim 1, wherein: The first light-in surface (11), the first light-out surface (12), the second light-in surface (21), the second light-out surface (22), the first protruding part (23), and the second protruding part (24) are all center-symmetrical about a same axis.

5. The optical module of claim 1, wherein: The first light-out surface (12) and the second light-in surface (21) are both curved surfaces, the first light-out surface (12) protrudes towards the second lens (20) in a light-out direction, and the second light-in surface (21) is recessed inward in the light-out direction.

6. The optical module of claim 1, wherein: A side surface of the second lens (20) has a first reflecting surface (26) and a second reflecting surface (27), the first reflecting surface (26) is located between the first lens (10) and the second reflecting surface (27), the second reflecting surface (27) is provided with a sawtooth structure (271) for dispersing light emitted by the light source on the second reflecting surface (27).

7. The optical module of claim 6, wherein: The second reflecting surface (27) is surrounded by a first opening and a second opening, a radius of the first opening is less than a radius of the second opening, and the first reflecting surface (26) is arranged around the first opening and connected with the second reflecting surface (27) through the first opening.

8. The optical module of claim 6, wherein: The cross-sectional profile of the first reflecting surface (26) gradually increases along the light-out direction, the cross-sectional profile of the second reflecting surface (27) gradually increases along the light-out direction, and the cross-sectional profile of the second reflecting surface (27) increases at a greater rate than the cross-sectional profile of the first reflecting surface (26).

9. A luminaire characterized by: The light source module comprises a light source module and the optical module as claimed in any one of claims 1-8, and the first lens (10) is arranged closer to the light source than the second lens (20).

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