Lens assembly with adjustable illumination angle, lamp and dimming method thereof

Abstract

The present invention provides a lens assembly with adjustable illumination angle, a lamp and a dimming method thereof, comprising a lens assembly A and a lens assembly B; a plurality of floodlight lenses and condenser lenses of equal number are arranged in a circular array on the lens assembly A, and the plurality of floodlight lenses and the plurality of condenser lenses are arranged alternately in sequence; a plurality of condenser portions and microstructure portions are arranged in a circular array on the lens assembly B, the number of condenser portions and the number of microstructure portions are both equal to the number of floodlight lenses, and the plurality of condenser portions and the plurality of microstructure portions are arranged alternately in sequence; the lens assembly A and the lens assembly B are rotatably connected around a group of axes simultaneously passing through the midpoint of the lens assembly A and the midpoint of the lens assembly B, and when the light concentrated by the condenser lens passes through the microstructure portion, the light through the floodlight lens passes through the condenser portion; compared with adjusting the light distribution angle by adjusting the relative axial distance between the lens and the light source, the present solution has a simple structure, is convenient to adjust, and is more conducive to miniaturization of the lamp.

Description

Technical Field

[0001] The present invention relates to the field of lighting lamps, and in particular to a lens assembly with adjustable illumination angle, a lamp and a dimming method thereof. Background Art

[0002] Most of the existing lighting fixtures only have one of the following modes: spotlighting or floodlighting. The distance between the light source and the light cup (or lens) is relatively fixed, and the function is single, which restricts the use scenarios of the lighting fixtures.

[0003] Some lamps with adjustable light distribution angles on the market mostly achieve zoom and angle adjustment by adjusting the relative axial distance between the lens and the light source, such as the "dimming lamp and dimming method" disclosed in Chinese patent application No. 200710125327.1, which adjusts the position of the second reflector cup located between the first reflector cup and the light source through an adjustment device, so that the light emitted by the light source is mainly irradiated on the first reflector cup or the second reflector cup, thereby achieving corresponding long-distance lighting or short-distance lighting.

[0004] The above adjustment method adjusts the light distribution angle without replacing the light cup (or lens). In order to adjust the axial distance, a complex zoom positioning structure is required, which makes the entire lamp structure complex and large in size. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the background technology and provide a lens, a lamp and a dimming method for adjusting the light distribution angle by rotation adjustment, which have a simple structure and are easy to adjust.

[0006] The embodiments of the present invention are implemented by the following technical solutions:

[0007] A lens assembly with adjustable illumination angle, comprising a lens assembly A and a lens assembly B;

[0008] The lens assembly A is provided with a plurality of floodlight lenses and condenser lenses in an array shape around the midpoint, and the plurality of floodlight lenses and the plurality of condenser lenses are alternately arranged in sequence;

[0009] The lens assembly B is provided with a plurality of light-collecting parts and micro-structure parts for light mixing in an array shape around the midpoint, the number of light-collecting parts and the number of micro-structure parts are equal to the number of floodlight lenses, and the plurality of light-collecting parts and the plurality of micro-structure parts are alternately arranged in sequence;

[0010] The lens assembly A and the lens assembly B are rotatably connected around a set of axes that simultaneously pass through the midpoints of the lens assembly A and the midpoints of the lens assembly B; when the light focused by the focusing lens passes through the microstructure portion, the light through the floodlight lens passes through the focusing portion.

[0011] In some preferred embodiments, the plurality of light focusing portions are disposed on the light incident surface or the light emitting surface of the lens assembly B.

[0012] In some preferred embodiments, the plurality of microstructure portions are disposed on the light incident surface or the light emitting surface of the lens component B.

[0013] In some preferred embodiments, the focusing portion is a convex structure or a Fresnel sawtooth structure provided on the lens assembly B.

[0014] In some preferred embodiments, the microstructure portion is a convex structure, a concave structure, or a frosted structure provided on the lens component B.

[0015] In some preferred embodiments, the focusing lens is a collimating lens.

[0016] In some preferred embodiments, the condenser lens and the floodlight lens are both in the shape of a light cup, and the outer wall of the condenser lens and the outer wall of the floodlight lens are both total reflection curved surfaces.

[0017] A lamp, wherein the above-mentioned lens assembly with adjustable illumination angle is used.

[0018] In a dimming method of the lamp as described above, the angle between the light focused by the focusing lens and the optical axis of the focusing lens is smaller than the angle between the light emitted by the floodlight lens and the optical axis of the floodlight lens;

[0019] When large-angle and close-range illumination is required, the lens assembly A and the lens assembly B are relatively rotated so that the light-emitting surfaces of the plurality of condensing lenses correspond one-to-one with the plurality of condensing parts, and the light-emitting surfaces of the plurality of floodlight lenses correspond one-to-one with the plurality of microstructure parts; the light condensed by the condensing lens is emitted after being refracted at a large angle in the condensing part, and the light emitted by the floodlight lens is emitted after being refracted at a small angle in the microstructure part;

[0020] When small-angle long-distance illumination is required, lens assembly A and lens assembly B are rotated relative to each other so that the light-emitting surfaces of a number of condensing lenses correspond one-to-one to a number of microstructure parts, and the light-emitting surfaces of a number of floodlight lenses correspond one-to-one to a number of condensing parts; the light concentrated by the condensing lenses is refracted at a small angle in the microstructure part and then emitted, and the light through the floodlight lenses is refracted at a large angle in the condensing part and then emitted.

[0021] The technical solution of the embodiment of the present invention has at least the following advantages and beneficial effects:

[0022] In the lens assembly with adjustable illumination angle of the present invention, by relative rotation of lens assembly A and lens assembly B, the floodlight type lens and the focusing type lens can be respectively combined with the microstructure part and the focusing part to select a light distribution mode, so that the lamp using the adjustable lens assembly can have two light distribution modes: large-angle short-distance illumination and long-distance small-angle illumination; compared with adjusting the light distribution angle by adjusting the relative axial distance between the lens and the light source, the adjustment is more convenient, the structure is simpler, and it is more conducive to the miniaturization of the lamp. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic structural diagram of the lens assembly and the lamp with adjustable illumination angle of the present invention in state 1;

[0024] Figure 2 It is a schematic structural diagram of the lens assembly and the lamp with adjustable illumination angle of the present invention in state 2;

[0025] Figure 3 The schematic diagram of the optical path of the lens assembly and the lamp with adjustable illumination angle of the present invention in state 1;

[0026] Figure 4 The schematic diagram of the optical path of the lens assembly and the lamp with adjustable illumination angle of the present invention in state 2;

[0027] Figure 5 A schematic diagram of the structure of a lens assembly and a lamp with adjustable illumination angle provided in Embodiment 2 of the present invention;

[0028] Figure 6 A schematic diagram of the structure of a lens assembly and a lamp with adjustable illumination angle provided in Embodiment 3 of the present invention;

[0029] Icon: 1-lens assembly A, 11-flood lens, 111-first total reflection curved surface, 112-first focusing convex surface, 113-first light incident surface, 12-focusing lens, 121-second total reflection curved surface, 122-second focusing convex surface, 123-second light incident surface, 2-lens assembly B, 21-focusing part, 211-central convex surface, 22-microstructure part, 3-light source. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0033] In the description of the present invention, it should be noted that if the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the product of the invention is usually placed when used. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0034] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] Example 1

[0036] like Figures 1 to 5 As shown, this embodiment provides a lens assembly with adjustable illumination angle, including a lens assembly A1 and a lens assembly B2.

[0037] The lens assembly A1 is provided with a plurality of equal floodlight lenses 11 and focusing lenses 12 in a circular array around the midpoint. In the present embodiment, the lens assembly A1 is disc-shaped and is provided with three groups of floodlight lenses 11 and three groups of focusing lenses 12. The three groups of floodlight lenses 11 and the three groups of focusing lenses 12 can be integrally formed with the lens assembly A1, or can be installed in a detachable connection manner.

[0038] In this embodiment, if Figure 1 and Figure 2As shown, the outer contours of the floodlight lens 11 and the condenser lens 12 are both in the shape of a light cup, and the outer wall of the condenser lens and the outer wall of the floodlight lens 11 are both total reflection surfaces, that is, the outer wall surface of the floodlight lens 11 is a first total reflection surface 111, and the outer wall surface of the condenser light cup 12 is a second total reflection surface 121. The angle between the outgoing light of the floodlight lens 11 and its own optical axis is a large angle type between 30° and 90°, and the angle between the outgoing light of the condenser lens 12 and its own optical axis is between 0° and 30°. Therefore, in some preferred embodiments, the condenser lens 12 can select a collimating lens.

[0039] In addition, if Figure 1 and Figure 2 As shown, the bottom of the floodlight lens 11 is provided with a light entrance hole, the bottom of the light entrance hole is a first light focusing convex surface 112, and the side wall of the light entrance hole is a first light entrance surface 113; the bottom of the focusing lens 12 is also provided with a light entrance hole, the bottom of the light entrance hole is a second light focusing convex surface 122, and the side wall of the light entrance hole is a second light entrance surface 123.

[0040] In some preferred embodiments, the first light-collecting convex surface 112 of the floodlight lens 11 and the second light-collecting convex surface 122 of the light-collecting lens 12 may be concave surfaces or Fresnel sawtooth surfaces.

[0041] The three floodlight lenses 11 and the three condenser lenses 12 are arranged in a circular array around the center of the disk of the lens element A1, and the three floodlight lenses 11 and the three condenser lenses 12 are alternately arranged at even intervals.

[0042] The lens assembly B2 is disc-shaped, and three groups of focusing parts 21 and three groups of microstructure parts 22 for mixing light are arranged in a circular array around the midpoint of the disc on its surface, that is, the number of focusing parts 21 and the number of microstructure parts 22 are equal to the number of floodlight lenses 11, and the three focusing parts 21 and the three microstructure parts 22 are alternately arranged in sequence and evenly spaced.

[0043] The three groups of focusing parts 21 and the three groups of microstructure parts 22 can be integrally formed with the lens component B2, the surface of the lens component B2 can be a plane or a curved surface, and the three groups of focusing parts 21 and the three groups of microstructure parts 22 can be arbitrarily arranged on the light incident surface or the light emitting surface of the lens component B2, that is: while the several focusing parts 21 are arranged on the light incident surface or the light emitting surface of the lens component B2, the several microstructure parts 22 can also be arranged on the light incident surface or the light emitting surface of the lens component B2.

[0044] The focusing portion 21 is a convex structure or a Fresnel sawtooth structure provided on the lens component B2, and in this embodiment it is a Fresnel sawtooth structure. The microstructure portion 22 can be a convex point structure, a concave point structure or a frosted structure provided on the lens component B2, and in this embodiment it is a convex point micro-light mixing structure.

[0045] The area where each group of focusing parts 21 and microstructure parts 22 are located is circular, and the size of the circular area where the focusing parts 21 are located and the size of the circular area where the microstructure parts 22 are located are consistent with the size of the light emitting surface of the floodlight lens 11 and the size of the light emitting surface of the focusing lens 12.

[0046] The lens assembly A1 and the lens assembly B2 are rotatably connected around a group of axes that simultaneously pass through the midpoints of the lens assembly A1 and the midpoints of the lens assembly B2. When the light converged by the three groups of focusing lenses 12 passes through a group of microstructure portions 22, the light from the three groups of floodlight lenses 11 passes through a group of focusing portions 21. When rotating 60°, when the light converged by the three groups of focusing lenses 12 passes through a group of focusing portions 21, the light from the three groups of floodlight lenses 11 passes through a group of microstructure portions 22.

[0047] Example 2

[0048] like Figure 5 As shown, this embodiment provides a lamp, in which the above-mentioned lens assembly with adjustable illumination angle is used, and each group of floodlight lens 11 and the light entrance hole of the focusing lens 12 are provided with LED-type light sources 3.

[0049] Example 3

[0050] like Figure 6 As shown, this embodiment provides a lamp, in which the above-mentioned lens assembly with adjustable illumination angle is used. Different from Embodiment 2, in this embodiment:

[0051] Two or more groups of light focusing parts 21 form a light focusing unit. Specifically, in this embodiment, three groups of light focusing parts 21 form a light focusing unit. The shape of the light focusing unit formed by the combination is not limited to Figure 6 The triangle shown may also be a square, a circle or other irregular shapes;

[0052] Similarly, two or more groups of microstructure parts 22 form a group of microstructure units. Specifically, in this embodiment, three groups of microstructure parts form a group of microstructure units. The shape of the microstructure unit formed by the combination is not limited to Figure 6 The triangle shown may also be a square, a circle or other irregular shapes;

[0053] Similarly, two or more groups of floodlight lenses 11 form a group of floodlight lens units. Specifically, in this embodiment, three groups of floodlight lenses 11 form a group of floodlight lens units. The shape of the floodlight lens units formed by the combination is not limited to a triangle, but can also be a square, a circle or other irregular shapes.

[0054] Similarly, two or more groups of condenser lenses 12 form a condenser lens unit, and the shape of the condenser lens unit is not limited to a triangle, but can also be a square, a circle or other irregular shapes;

[0055] A plurality of groups of floodlight lens units and a plurality of groups of condenser lens units are arranged in an array around the center of the lens assembly A1, and the plurality of groups of floodlight lens units and the plurality of groups of condenser lens units are arranged alternately; a plurality of groups of condenser units and a plurality of groups of microstructure units are arranged in an array around the center of the lens assembly B2, and the plurality of groups of condenser units and the plurality of groups of microstructure units are arranged alternately in sequence;

[0056] In the present embodiment, each group of focusing parts 21, each group of microstructure parts 22, each group of floodlight type lenses 11 and each group of focusing type lenses 12 in Embodiment 2 are respectively equivalent to the focusing units, microstructure units, floodlight type lens units and focusing type lens units in the present embodiment. The working principle is consistent with that in Embodiment 2 and will not be repeated here.

[0057] In addition, an LED light source 3 is disposed in the light entrance hole of each set of floodlight lenses 11 and the light entrance hole of the condenser lens 12 .

[0058] Example 4

[0059] like Figures 1 to 5 As shown, this embodiment discloses a dimming method of the lamp in Embodiment 2;

[0060] like Figure 3 and Figure 4 As shown, due to the different optical properties of the floodlight lens 11 and the condenser lens 12 , the angle between the light converged by the condenser lens 12 and the optical axis of the condenser lens 12 is smaller than the angle between the light emitted by the floodlight lens 11 and the optical axis of the floodlight lens 11 .

[0061] like Figure 3 As shown, as state 1, when large-angle and close-range illumination is required, the lens assembly A1 and the lens assembly B2 are relatively rotated so that the light-emitting surface of each group of condensing lenses 12 on the left side of the figure corresponds to a group of condensing portions 21 one by one, and the light-emitting surface of each group of floodlight lenses 11 on the right side corresponds to a group of microstructure portions 22 one by one;

[0062] The light emitted by the left light source 3 is refracted by the second light incident surface 123 of the condensing lens 12, and then totally reflected by the second total reflection curved surface 121. The light emission direction has a small angle with the optical axis of the condensing lens 12, which is close to parallel. After passing through the condensing portion 21 of the lens assembly B2, the light is refracted at a large angle, deviates from the optical axis, and finally emitted in a large angle direction. Another part of the light is refracted by the second condensing convex surface 122, and has a small angle with the optical axis, which is close to collimated light. When passing through the central convex surface 211 at the center of the condensing portion 21 of the Fresnel sawtooth structure, refraction occurs, and the light is refracted at a large angle, so that the light is emitted in a large angle direction.

[0063] The light emitted by the right light source 3 is refracted by the first light incident surface 113 of the floodlight lens 11, and then totally reflected by the first total reflection curved surface 11. The light emission direction deviates from the optical axis of the floodlight lens 11, and has a large angle with the optical axis. Then, it is refracted and mixed by the microstructure portion 22 of the lens assembly B2. After a slight refraction, the light still emits in a large angle direction. After another part of the light is refracted by the first focusing convex surface 112 at the bottom of the light incident hole, the light emission direction deviates from the optical axis of the floodlight lens 11, and has a large angle with the optical axis. Then, it is refracted and mixed by the microstructure portion 22 of the lens assembly B2. After a slight refraction, the light emits in a large angle direction. The two types of light distribution angles of the three groups of floodlight lenses 11 and the three groups of focusing lenses 12 are combined into a maximum light distribution angle, which is suitable for large-angle and short-distance lighting.

[0064] like Figure 4 As shown, as state 2, when small-angle long-distance illumination is required, the lens assembly A1 and the lens assembly B2 are relatively rotated, and after being rotated 60° relative to state 1, the light-emitting surfaces of the plurality of condensing lenses 12 correspond to the plurality of microstructure portions 22 one by one, and the light-emitting surfaces of the plurality of floodlight lenses 11 correspond to the plurality of condensing portions 21 one by one;

[0065] The light emitted by the light source 3 on the left is refracted by the second light incident surface 123 of the focusing lens 12, and then totally reflected by the second total reflection curved surface 121. The light emission direction is basically parallel to the optical axis of the focusing lens 12. After being refracted by the microstructure portion 22 of the lens assembly B2, the light slightly deviates from the optical axis and finally emits in the direction of the optical axis at a small angle. The other part of the light is refracted by the second focusing convex surface 122 and approaches a collimated light beam. It then undergoes secondary refraction and mixing by the microstructure portion 22 in the lens assembly B2, so that the light is slightly refracted and finally emits in the direction of the optical axis at a small angle.

[0066] The light emitted by the light source 3 on the right is refracted by the first light incident surface 113 of the floodlight lens 12, and then reflected by the first total reflection curved surface 111. The light emission direction deviates from the optical axis of the floodlight lens 12, and the angle with the optical axis is relatively large. After passing through the focusing portion 21 of the Fresnel tooth structure of the lens assembly B2, the light is refracted at a large angle in the opposite direction, so that the light is finally emitted in the direction of a small angle to the optical axis. Another part of the light is slightly refracted by the first focusing convex surface 112, and the light emission direction deviates from the optical axis of the floodlight lens 12, and the angle with the optical axis is relatively large. After the second refraction by the focusing portion 21 of the Fresnel tooth structure of the lens assembly B2, the light is refracted at a large angle in the opposite direction, so that the light is emitted in the direction of a small angle. The two types of light distribution angles of the three groups of floodlight lenses 11 and the three groups of focusing lenses 12 are combined into a small light distribution angle, which is suitable for long-distance small-angle illumination needs.

[0067] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A lens assembly with adjustable illumination angle, characterized in that: The invention comprises a lens assembly A (1) and a lens assembly B (2); The lens assembly A (1) is provided with a plurality of floodlight lenses (11) and condenser lenses (12) of equal number in a circular array around a midpoint, and the plurality of floodlight lenses (11) and the plurality of condenser lenses (12) are alternately arranged in sequence; The lens assembly B (2) is provided with a plurality of light-collecting portions (21) and microstructure portions (22) in an array shape around a midpoint, the number of the light-collecting portions (21) and the number of the microstructure portions (22) being equal to the number of the floodlight lens (11), and the plurality of light-collecting portions (21) and the plurality of microstructure portions (22) being alternately arranged in sequence; The lens assembly A (1) and the lens assembly B (2) are rotatably connected around a set of axes that simultaneously pass through the midpoint of the lens assembly A (1) and the midpoint of the lens assembly B (2); when light concentrated by the focusing lens (12) passes through the microstructure portion (22), light passing through the floodlight lens (11) passes through the focusing portion (21).

2. The lens assembly with adjustable illumination angle according to claim 1, characterized in that: The plurality of light focusing portions (21) are arranged on the light incident surface or the light emitting surface of the lens assembly B (2).

3. The lens assembly with adjustable illumination angle according to claim 1 or 2, characterized in that: The plurality of microstructure parts (22) are arranged on the light incident surface or the light emitting surface of the lens assembly B (2).

4. The lens assembly with adjustable illumination angle according to claim 2, characterized in that: The focusing portion (21) is a convex structure or a Fresnel sawtooth structure provided on the lens assembly B (2).

5. The lens assembly with adjustable illumination angle according to claim 3, characterized in that: The microstructure portion (22) is a convex point structure, a concave point structure or a frosted structure provided on the lens assembly B (2).

6. The lens assembly with adjustable illumination angle according to claim 1, characterized in that: The condensing lens (12) is a collimating lens.

7. The lens assembly with adjustable illumination angle according to claim 1, characterized in that: The condenser lens (12) and the floodlight lens (11) are both in the shape of a light cup, and the outer wall of the condenser lens (12) and the outer wall of the floodlight lens (11) are both total reflection curved surfaces.

8. A lens assembly with adjustable illumination angle, characterized in that: The invention comprises a lens assembly A (1) and a lens assembly B (2); The lens assembly A (1) is provided with a plurality of floodlight lens units and condenser lens units in an array shape around a midpoint, and the plurality of floodlight lens units and the plurality of condenser lens units are alternately arranged in sequence; The lens assembly B (2) is provided with a plurality of light-gathering units and micro-structure units in an array shape around a midpoint, the number of light-gathering units and the number of micro-structure units being equal to the number of floodlight lens units, and the plurality of light-gathering units and the plurality of micro-structure units being alternately arranged in sequence; The floodlight lens unit comprises at least two groups of floodlight lenses (11), and the condenser lens unit comprises at least two groups of condenser lenses (12); the condenser unit comprises at least two groups of condenser portions (21), and the microstructure unit comprises at least two groups of microstructure portions (22); The lens assembly A (1) and the lens assembly B (2) are rotatably connected around a set of axes that simultaneously pass through the midpoint of the lens assembly A (1) and the midpoint of the lens assembly B (2); when the light concentrated by the focusing lens unit passes through the microstructure unit, the light passing through the floodlight lens unit passes through the focusing unit.

9. A lamp, characterized in that: The lamp uses the lens assembly with adjustable illumination angle as described in any one of claims 1 to 8.

10. A dimming method for a lamp as claimed in claim 9, characterized in that: The angle between the light focused by the condensing lens (12) and the optical axis of the condensing lens (12) is smaller than the angle between the light emitted by the floodlight lens (11) and the optical axis of the floodlight lens (11); When large-angle and close-range illumination is required, the lens assembly A (1) and the lens assembly B (2) are relatively rotated so that the light-emitting surfaces of the plurality of condensing lenses (12) correspond one-to-one with the plurality of condensing portions (21), and the light-emitting surfaces of the plurality of floodlight lenses (11) correspond one-to-one with the plurality of microstructure portions (22); the light condensed by the condensing lenses (12) is refracted at a large angle in the condensing portions (21) and then emitted, and the light emitted by the floodlight lenses (11) is refracted at a small angle in the microstructure portions (22) and then emitted; When small-angle long-distance illumination is required, the lens assembly A (1) and the lens assembly B (2) are relatively rotated so that the light-emitting surfaces of the plurality of condensing lenses (12) correspond one-to-one with the plurality of microstructure portions (22), and the light-emitting surfaces of the plurality of floodlight lenses (11) correspond one-to-one with the plurality of condensing portions (21); the light condensed by the condensing lenses (12) is refracted at a small angle in the microstructure portion (22) and then emitted, while the light condensed by the floodlight lenses (11) is refracted at a large angle in the condensing portion (21) and then emitted.

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