Lens unit and lighting device

Abstract

To provide a lens unit capable of suppressing positional deviation from a board or a light emitting element, and a lighting device.SOLUTION: A lighting device 10 comprises a lens assembly 32, a presser leg part 35, and a positioning leg part 34. The lens assembly 32 is formed such that a plurality of lenses 31 that refract light from light emitting elements 22 mounted on one surface side of a board 21, each being assembled with a predetermined distance between their centers. The presser leg part 35 protrudes from the lens assembly 32, and presses the one surface side of the board 21. The positioning leg part 34 protrudes from the lens assembly 32, and positions the lens assembly 32 and the board 21.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] FIELD An embodiment of the present invention relates to a lens unit and an illumination device. [Background technology]

[0002] Conventionally, there is a lighting device that includes a substrate on which a plurality of light-emitting elements are mounted on the front side, and a lens unit that is disposed on the front side of the substrate and is formed by assembling a plurality of lenses that refract the light from the light-emitting elements.

[0003] In this lighting device, if there is a misalignment between the substrate or light-emitting element and the lens unit, there is a risk that the desired optical characteristics will not be obtained, so there is a demand for suppressing the misalignment between the substrate or light-emitting element and the lens unit. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2003-281909 Summary of the Invention [Problem to be solved by the invention]

[0005] An object of the present invention is to provide a lens unit and a lighting device that can suppress misalignment with a substrate or a light-emitting element. [Means for solving the problem]

[0006] The lens unit of the embodiment includes a lens assembly, a presser leg, and a positioning leg. The lens assembly is formed by assembling a plurality of lenses, each of which refracts light from a light-emitting element mounted on one side of a substrate, with a predetermined center-to-center distance between them. The presser leg protrudes from the lens assembly and presses down on the one side of the substrate. The positioning leg protrudes from the lens assembly and positions the lens assembly and the substrate. The positioning legs are positioned between the outermost lens and the outermost inner lens of the lens assembly. [Effects of the Invention]

[0007] According to the lens unit of the embodiment, it is expected that misalignment with the substrate or the light emitting element can be suppressed. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a schematic diagram of an illumination device showing one embodiment. [Figure 2] 3 is an explanatory diagram showing the positional relationship between a light source module and a lens unit of the illumination device; FIG. [Figure 3] FIG. 4A is a cross-sectional view of the lens unit as seen from FIG. 4A-A. [Figure 4] FIG. [Figure 5] FIG. 2 is a perspective view of the rear side of the lens unit. [Figure 6] FIG. 2 is a perspective view of the front side of the lens unit. DETAILED DESCRIPTION OF THE INVENTION

[0009] An embodiment will be described below with reference to the drawings.

[0010] FIG. 1 shows a schematic diagram of a lighting device 10. The lighting device 10 is, for example, a spotlight, a downlight, a projector, or the like that projects light. The lighting device 10 includes a light source module 11, a heat sink 12 to which the light source module 11 is attached, a lens device 14 composed of a plurality of lens units 13 that control the light emitted from the light source module 11, a condenser lens 15 that collects the light that has been controlled (e.g., refracted) by the lens device 14, a diffuser plate 16 that diffuses the light that has been collected by the condenser lens 15, an aperture body 18 having an aperture 17 through which light that has passed through the diffuser plate 16 passes, and a projection lens 19 that projects the light that has passed through the aperture 17. The lighting device 10 also includes a housing in which the above-mentioned components are disposed, a power supply unit that turns on the light source module 11, and the like.

[0011] 1 and 2, the light source module 11 includes a substrate 21 and a plurality of light-emitting elements 22 mounted on one surface, that is, the front side (surface side), of the substrate 21. Note that Fig. 2 is an explanatory diagram showing the positional relationship between the substrate 21 and the plurality of light-emitting elements 22 of the light source module 11 and the lens unit 13 of the lens device 14, and is a view seen through the light source module 11 from the rear side of the light source module 11 and the lens unit 13.

[0012] The substrate 21 is, for example, rectangular and has a plate-like shape. The shape of the substrate 21 may be polygonal, circular, or other shapes in addition to a rectangle. The substrate 21 is a single-layer or single-sided substrate and has a base plate formed of a metal material such as aluminum, a resin material such as glass epoxy, or an inorganic material such as ceramics such as aluminum oxide or aluminum nitride. A wiring pattern is formed on the front side of the base plate. The wiring pattern includes a plurality of mounting pads for mounting each light-emitting element 22 and wiring sections that connect the mounting pads for each type of light-emitting element 22 in series or series-parallel and are connected to input terminal sections provided around the front side of the substrate 21. The wiring sections are routed between the mounting pads and along the peripheral area of ​​the substrate 21. If there are intersections where some of the wiring sections intersect, an upper-layer wiring section that intersects with a jumper insulating layer provided on a lower-layer wiring section at the intersection, thereby insulating the wiring sections from each other.

[0013] The light emitting elements 22 mounted on the front side of the substrate 21 are mounted in a staggered arrangement within a mounting range 23 that is a circle with a predetermined radius (e.g., a radius of 100 mm) from the center of the substrate 21. The staggered arrangement refers to a case where rows and columns of the light emitting elements 22 can be defined by the arrangement of the light emitting elements 22, and in any column (or row; similarly, although not described below, the notation "column" can be interpreted as "row"), adjacent light emitting elements 21 are arranged linearly in a first direction (e.g., the horizontal direction in FIG. 2) with a predetermined pitch between their centers. Then, in a column adjacent to the arbitrary column, adjacent light emitting elements 22 are arranged linearly in the first direction with a predetermined pitch between their centers so that the centers of the light emitting elements 22 are spaced apart from the light emitting elements 22 in the arbitrary column and the central positions of the light emitting elements 22 in the first direction are shifted by half the distance of the predetermined pitch relative to the light emitting elements 22 in the arbitrary column.

[0014] The predetermined pitch of the plurality of light-emitting elements 22 is, for example, 12 mm, and half the distance of the predetermined pitch is, for example, 6 mm. In other words, three adjacent light-emitting elements 22 are positioned at the vertices of an equilateral triangle with one side having the length of the predetermined pitch, and at the same time, six light-emitting elements 22 are adjacent to one light-emitting element 22 around it, and these six light-emitting elements 22 are positioned at the vertices of a regular hexagon with one side having the length of the predetermined pitch.

[0015] The other surface of the substrate 21, that is, the rear side (back surface side), is attached so as to be in direct or indirect surface contact with the heat sink 12 and thermally connected thereto. When the rear side of the substrate 21 and the heat sink 12 are in indirect surface contact with each other, for example, thermal grease or a thermal sheet is provided between the substrate 21 and the heat sink 12.

[0016] A plurality of lens unit arrangement sections 24, in which a plurality of lens units 13 are respectively arranged, are provided in the mounting area 23 of the substrate 21. The lens unit arrangement sections 24 are divided at predetermined angles θ in the circumferential direction of the mounting area 23. In this embodiment, the mounting area 23 is divided at ranges of, for example, 120° in the circumferential direction, and three lens unit arrangement sections 24 are provided.

[0017] 2 and 3, the mounting area 23 (each lens unit placement section 24 of the substrate 21) is provided with a plurality of screw insertion holes 25 for screwing the lens unit 13 to the heat sink 12 instead of mounting the light-emitting element 22 at the position of a specific light-emitting element 22, and a plurality of positioning holes 26 which are positioned sections for positioning the lens unit 13 at the center position of three adjacent light-emitting elements 22.

[0018] The screw insertion holes 25 are provided at positions of the light-emitting elements 22 on the inner periphery of the lens unit arrangement section 24, and are provided at the position of the third light-emitting element 22 toward the outer diameter side when the light-emitting element 22 located on the innermost periphery (in this embodiment, these are three light-emitting elements 22 arranged around the center point of a mounting area 23 formed by a plurality of lens unit arrangement sections 24, and the light-emitting element 22 at position a in Figure 2) is considered to be the position of the first light-emitting element 22, and at the positions of the three light-emitting elements 22 on the outermost periphery of the lens unit arrangement section 24. Some of the screw insertion holes 25 provided at the positions of the three light-emitting elements 22 on the outermost periphery of the lens unit arrangement section 24 are provided outside the mounting area 23. At least some of the screw insertion holes 25 are not provided in place of mounting the light-emitting elements 22, but are provided outside the positions where the light-emitting elements 22 are mounted (in a direction away from the center of the lens unit arrangement section 24).

[0019] The positioning holes 26 are provided near two sides where the lens unit arrangement portion 24 is adjacent to two other lens unit arrangement portions 24, and one or more positioning holes 26 are provided near the outer diameter side of the mounting area 23.

[0020] The substrate 21 may be screwed to the heat sink 12 together with the lens unit 13, or may be screwed directly to the heat sink 12 separately from the lens unit 13. In this case, the substrate 21 may be provided either inside or outside the mounting area 23, and as long as it is provided inside the mounting area 23, the substrate 21 may be screwed between the three light-emitting elements 22 or at the position of the light-emitting elements 22.

[0021] The light emitting elements 22 are, for example, of an SMD (Surface Mount Device) package type or a CSP (Chip Scale Package) type, and are connected by soldering to mounting pads of a wiring pattern on the substrate 21. Light is emitted when lighting power is supplied from a power supply through the wiring pattern. Wiring portions of the wiring pattern are arranged along the spaces between the light emitting elements 22 mounted on the substrate 21. It is preferable that the light emitting elements 22 have a lens portion disposed on the light emitting surface. Note that the resin material that seals the light emitting elements 22 may be formed into a convex shape so as to form a lens portion facing the light emitting direction, thereby allowing the light emitting elements 22 to function as a lens portion.

[0022] In the case where the lighting device 10 is a color projector capable of projecting light of any light color, the plurality of light-emitting elements 22 may include light-emitting elements 22 of each light color such as red, green, blue, and cyan, and may further include light-emitting elements 22 containing phosphors that emit light of a mint color, which is bright green, yellow, or bluish green, or light of an amber color. The light-emitting elements 22 of each light color are arranged on the substrate 21 in consideration of color mixing. The plurality of light-emitting elements 22 may include light-emitting elements 22 that emit light of a single light color, or multi-color light-emitting elements 22 that can individually emit the above-mentioned plurality of light colors.

[0023] The power supply unit supplies lighting power to the light emitting elements 22 of each color in the light source module 11 in accordance with the color of the light to be projected, thereby lighting them up.

[0024] 1 and 3, the heat sink 12 may be made of a metal such as aluminum that has excellent thermal conductivity and heat dissipation properties, and may be provided with a heat dissipation structure such as a heat dissipation fin. The front side of the heat sink 12 is formed flat, and the rear side of the substrate 21 of the light source module 11 is in surface contact with this front side and is screwed to be thermally connected. The front side of the heat sink 12 has a plurality of screw holes 28 that serve as mounting holes at a plurality of screw positions.

[0025] 2, the lens device 14 is configured by combining a plurality of lens units 13 of the same shape. For example, the lens device 14 is configured in a substantially circular shape by combining lens units 13 each having a substantially fan shape that is divided in the circumferential direction at a predetermined angle θ. In this embodiment, the lens device 14 is configured in a substantially circular shape by combining three lens units 13 each having a substantially fan shape that is divided in the circumferential direction at 120° intervals, corresponding to the lens unit arrangement portion 24 of the substrate 21.

[0026] As shown in FIGS. 2 to 6 , the lens unit 13 is integrally formed from a transparent material such as acrylic resin or polycarbonate. The lens unit 13 includes a lens assembly 32 formed by assembling a plurality of lenses 31 each having a circular outer shape, a plurality of mounting portions 33 for mounting the lens unit 13 to the heat sink 12, a plurality of positioning legs 34 for positioning the lens unit 13 relative to the substrate 21, and a plurality of retaining legs 35 for retaining the substrate 21 to the heat sink 12 from the front side. Each lens 31 is disposed so that the center-to-center distance between the center of the lens 31 and the center of an adjacent lens 31 is a predetermined distance. In other words, the center-to-center distance between adjacent lenses 31 of all the lenses 31 included in the lens unit 13 is the same. The mounting portion 33 is disposed in the lens unit 13 in place of the lens 31. In other words, the mounting portion 33 is disposed in a position surrounded by the plurality of lenses 31 so that the center-to-center distance between the mounting portion 33 and the center of an adjacent lens 31 is a predetermined distance. In other words, the center-to-center distances between the center of the mounting portion 33 and the center of the lens 31 adjacent to the mounting portion 33 are all the same.

[0027] The lens assembly 32 includes a plurality of lenses 31 and a connecting portion 36 that connects the front ends of the plurality of lenses 31 together.

[0028] The lens assembly 32 is fan-shaped and includes a central position a, which is the center of the fan; adjacent portions (divided portions) b on both sides along each radial direction of 120°, which is a predetermined angle θ, from the central position a; and a substantially arc-shaped outermost peripheral portion c connecting the outer ends of the adjacent portions b on both sides. The central position a is a portion that is located near the center of a lens device 14 made up of multiple lens units 13 when multiple lens units 13 are arranged. For example, the respective central positions a of three or more lens units 13 may be arranged to surround the center point of the lens device 14, or the center position a of one lens unit 13 may be arranged to be located at the center point of the lens device 14. The adjacent portions (divided portions) b are sides and surfaces that face adjacent lens units 13 when multiple lens units 13 are arranged. It is desirable that the adjacent portions (divided portions) b of adjacent lens units 13 contact (connect) each other. The outermost periphery c does not face adjacent lens units 13 when at least a plurality of lens units 13 are arranged, and is a portion that forms the outermost periphery and outermost surface of the lens device 14 made up of a plurality of lens units 13. The plurality of lenses 31 are arranged in a staggered pattern, with the plurality of lenses 31 having the same center-to-center distance, i.e., pitch, and three adjacent lenses 31 positioned at each vertex of an equilateral triangle, and six lenses 31 adjacent to one lens 31 are positioned around it, with these six lenses 31 positioned at each vertex of a regular hexagon. The arrangement of the lenses 31 corresponds to the arrangement of the plurality of light-emitting elements 22 on the substrate 21.

[0029] The lens 31 is a total-reflection collimator lens. Collimator lenses refract light from the light-emitting element 22, primarily to convert the light from the light-emitting element 22 into parallel light parallel to the lens optical axis. The lens 31 is not limited to a lens that refracts parallel light, but may instead be configured to refract light in a predetermined direction according to the required optical characteristics. The lens 31 has a recess 37 in which the light-emitting element 22 is disposed, and an incident surface 38 onto which light emitted from the light-emitting element 22 enters is formed on the inner surface of the recess 37. The incident surface 38, located at the back of the recess 37 and facing the front surface of the light-emitting element 22, is formed as a convex curved surface, refracting the light from the light-emitting element 22 into parallel light parallel to the lens optical axis. An exit surface 39 from which light exits the lens 31 is formed on the front side of the lens 31. A reflective surface 40 is formed between the entrance surface 38 and the exit surface 39, totally reflecting the light incident from the entrance surface 38 toward the exit surface 39. Reflecting surface 40 is formed in a generally conical shape whose diameter increases from the incident side on the rear side toward the exit side on the front side. Exit surface 39 may be a flat surface or a Fresnel lens surface.

[0030] The connecting portion 36, which integrally connects the front ends of the multiple lenses 31, has a planar front surface that is flush with the emission surfaces 39 of the multiple lenses 31. The connecting portion 36 is provided around the peripheral portion of the lens assembly 32, i.e., the central position a, each adjacent portion b, and each outermost peripheral portion c of the lenses 31, so that the connecting portion 36 has two or three sides 41 of a hexagon when viewed from the front or rear in the direction of the lens optical axis. As shown in FIG. 2 , the hexagonal sides 41 of the lenses 31 located in the adjacent portions b of adjacent lens units 13 fit together, thereby combining the adjacent lens units 13. The lenses 31 located in the adjacent portions b of adjacent lens units 13 are also positioned in the same positional relationship as the lenses 31 within the lens units 13 described above.

[0031] The mounting portion 33 is formed in the shape of a cylindrical boss that protrudes from the rear side of the lens unit 13 at the position of a predetermined lens 31, and has a mounting hole 43 formed inside. The mounting portion 33 protrudes from the rear side of the lens unit 13 by a predetermined length L beyond the lens 31, and abuts against the front side of the substrate 21.

[0032] The mounting portions 33 are provided at the positions of the plurality of lenses 31, namely, at a position inside the central position a, the third lens 31 from the central position a toward the outer diameter side (the outermost peripheral portion c) and the third lens 31 from adjacent portions b on both sides, and at three positions of the lenses 31 at both ends and the center of the outermost peripheral portion c. The positions of the mounting portions 33 correspond to the positions of the screw insertion holes 25 of the lens unit arrangement portions 24 of the substrate 21 and the positions of the screw holes 28 of the heat sink 12.

[0033] Then, a screw 44 is inserted into the mounting hole 43 from the front side of the lens unit 13, passes through the screw insertion hole 25 of the substrate 21, and is screwed into the screw hole 28 of the heat sink 12, thereby tightening and fixing the mounting portion 33 of the lens unit 13 to the heat sink 12 with the substrate 21, which is interposed between the mounting portion 33 of the lens unit 13 and the heat sink 12, pressed against the heat sink 12.

[0034] The positioning leg 34 protrudes from the rear side of the lens assembly 32 at a position between predetermined pairs of lenses 31. The positioning leg 34 includes a cylindrical pressing portion 46 protruding from the rear side of the lens unit 13, and a cylindrical protrusion 47 having a smaller diameter than the pressing portion 46 and protruding from the center of the tip surface of the pressing portion 46. Similar to the mounting portion 33, the pressing portion 46 protrudes from the rear side of the lens unit 13 beyond the lenses 31 by a predetermined length L, and abuts against the front side of the substrate 21. The protrusion 47 is inserted into the positioning hole 26 of the substrate 21. The protruding length of the protrusion 47 is set shorter than the thickness of the substrate 21.

[0035] The positioning legs 34 are provided at two locations in each of the adjacent portions b on both sides, between two lenses 31 located near the outermost periphery c, for example, the second and third lenses 31 from the outermost periphery c, and one lens 31 located inside those two lenses 31. The position of each positioning leg 34 corresponds to the position of each positioning hole 26 in each lens unit arrangement portion 24 of the substrate 21.

[0036] The presser leg portion 35 is cylindrically provided at a position between a predetermined number of lenses 31, and protrudes from the rear side of the lens unit 13. Like the attachment portion 33 and the presser portion 46, the presser leg portion 35 protrudes from the rear side of the lens unit 13 beyond the lenses 31 by a predetermined length L, and abuts against the front side of the substrate 21.

[0037] The presser foot 35 is provided within an area surrounded by three closely positioned mounting portions 33 out of the multiple mounting portions 33 that screw the lens unit 13 to the heat sink 12, within the range of an imaginary circle 49 whose center is a center point O that is equidistant from the three mounting portions 33 and whose radius is the same as the radius of the lens 31. In other words, the presser foot 35 is provided within the range of the imaginary circle 49 whose center is the center point O of the circle that passes through the positions of the three closely positioned mounting portions 33. Note that the presser foot 35 is preferably located at the center point O between the three mounting portions 33. However, depending on the relative positions of the lens 31, the presser foot 35 may be located within the range of the imaginary circle 49, not necessarily at the center point O. The positioning of the presser foot 35 within the range of the imaginary circle 49 does not necessarily mean that the entire presser foot 35 or the center of the presser foot 35 is located within the range of the imaginary circle 49, but also includes the case where at least a portion of the presser foot 35 is located within the range of the imaginary circle 49.

[0038] 4, the three mounting portions 33 and the presser legs 35 between the three mounting portions 33 are shown connected by dashed lines. The three mounting portions 33 include two sets: a first set consisting of mounting portion 33a near the center position a, mounting portion 33c at the center of the outermost periphery c, and mounting portion 33b on one end side of the outermost periphery c, and a second set consisting of mounting portion 33a near the center position a, mounting portion 33c at the center of the outermost periphery c, and mounting portion 33d on the other end side of the outermost periphery c. In this embodiment, in the relationship between the first set and the presser leg 35 located inside the first set, the distance between the mounting portion 33a and the presser leg 35 is the same as the distance between the mounting portion 33c and the presser leg 35, but the distance between the mounting portion 33a and the presser leg 35 is not the same as the distance between the mounting portion 33b (mounting portion 33c) and the presser leg 35. Details of the second set will be omitted, but it has a similar configuration to the first set because it is a mirror image of the first set.

[0039] Furthermore, since the mounting portion 33, the pressing portion 46 of the positioning leg portion 34, and the pressing leg portion 35 protrude further than the lens 31 on the rear side of the lens unit 13, when the lens unit 13 is attached to the heat sink 12 via the substrate 21, a gap is formed between the multiple lenses 31 and the substrate 21.

[0040] As shown in FIG. 1, the condenser lens 15 condenses the light emitted from each lens 31 of each lens unit 13.

[0041] The diffuser plate 16 receives the light condensed by the condenser lens 15, and diffuses and mixes the colors.

[0042] Aperture body 18 blocks light that spreads around it and transmits light that corresponds to the shape of aperture 17. Aperture 17 is smaller than the size of substrate 21 and smaller than the size of mounting area 23 of light emitting element 22.

[0043] Furthermore, the projection lens 19 projects the light that has passed through the aperture 17 .

[0044] 1, the diffuser plate 16 is provided between the lens unit 13 and the aperture 17, but the diffuser plate 16 may be provided between the aperture 17 and the projection lens 19. Also, a convex lens (single convex lens or double convex lens) for controlling light may be provided between the aperture 17 and the projection lens 19.

[0045] In the lighting device 10, the light-emitting elements 22 of each color are turned on according to the color of light to be projected, and the light from the turned-on light-emitting elements 22 is converted into parallel light parallel to the lens optical axis by the lens 31 and emitted, and is then focused by the focusing lens 15 toward the aperture 17, and the light is mixed by the diffusion plate 16 just before the aperture 17, and the light that has passed through the aperture 17 is projected by the projection lens 19.

[0046] The heat generated when the light emitting element 22 is turned on is transferred from the substrate 21 to the heat sink 12 and dissipated, thereby suppressing the temperature rise of the light source module 11.

[0047] Next, the operation of the lens unit 13 will be described.

[0048] The lens unit 13 is disposed on the front side of the substrate 21 of the light source module 11 disposed on the heat sink 12 and attached to the heat sink 12 .

[0049] The substrate 21 of the light source module 11 is positioned relative to the heat sink 12, and the plurality of screw insertion holes 25 of the substrate 21 and the plurality of screw holes 28 of the heat sink 12 are arranged coaxially. In this case, the substrate 21 may be screwed to the heat sink 12 using some of the plurality of coaxially arranged screw insertion holes 25 and screw holes 28. Some of the plurality of coaxially arranged screw insertion holes 25 and screw holes 28 are screw insertion holes 25 and screw holes 28 that are not positioned coaxially with the mounting hole 43 of the mounting portion 33 of the lens unit 13, which will be described later.

[0050] Each lens unit 13 is disposed in each lens unit disposing section 24 in a mounting area 23 of the substrate 21 .

[0051] The lens unit 13 is positioned and placed in the lens unit placement portion 24 of the substrate 21 by inserting the positioning legs 34 into the positioning holes 26 of the substrate 21. This positions and places the mounting hole 43 of the mounting portion 33 of the lens unit 13 coaxially with the screw insertion hole 25 of the substrate 21. Furthermore, the adjacent portion b that is to be combined with the adjacent lens unit 13 is positioned.

[0052] Since the positioning leg 34 is located between the outermost lens 31 (adjacent part b) of the lens assembly 32 and the innermost lens 31 of the outermost lens (adjacent part b), it is easy to see when aligning and inserting the positioning leg 34 into the positioning hole 26 of the substrate 21, making assembly work easy.

[0053] A screw 44 is inserted into the mounting hole 43 of the mounting portion 33 from the front side of the lens unit 13, passes through the screw insertion hole 25 of the substrate 21, and is screwed into the screw hole 28 of the heat sink 12, so that the mounting portion 33 of the lens unit 13 abuts against the front side of the substrate 21, and the substrate 21 is sandwiched between the substrate 21 and the heat sink 12 and pressed against the heat sink 12, and the mounting portion 33 of the lens unit 13 is tightened and fixed to the heat sink 12.

[0054] In the lens unit 13 screwed to the heat sink 12, the tip surfaces of the multiple pressing legs 35 and the tip surfaces of the pressing portions 46 of the multiple positioning legs 34 abut against the front side of the substrate 21, and these pressing legs 35 and pressing portions 46 press the substrate 21 against the heat sink 12. The pressing legs 35 and pressing portions 46 abut between three adjacent light-emitting elements 22 on the substrate 21.

[0055] Although the substrate 21 is pressed against the heat sink 12 at the positions of each mounting portion 33, positions away from the mounting portions 33, i.e., the center point O of the substrate 21 surrounded by the three mounting portions 33 and its vicinity, may rise from the heat sink 12 due to thermal expansion caused by the heat generated when the light emitting element 22 is turned on, reducing contact between the substrate 21 and the heat sink 12, reducing heat transfer from the substrate 21 to the heat sink 12, and potentially causing a rise in the temperature of the substrate 21. In this embodiment, the presser feet 35 press down on the center point O of the substrate 21 surrounded by the multiple mounting portions 33 or its vicinity (within the range of an imaginary circle 49 centered on the center point O and having the radius of the lens 31). This prevents the region of the substrate 21 surrounded by the three mounting portions 33 from rising up from the heat sink 12, ensuring contact between the substrate 21 and the heat sink 12, improving heat transfer from the substrate 21 to the heat sink 12, and suppressing a rise in the temperature of the substrate 21.

[0056] Each light-emitting element 22 of the substrate 21 is disposed in a recess 37 of each lens 31 of the lens unit 13 , and each light-emitting element 22 faces an incident surface 38 of each lens 31 .

[0057] Since the mounting portion 33, the pressing portion 46 of the positioning leg portion 34, and the pressing leg portion 35 protrude further than the lenses 31 on the rear side of the lens unit 13, gaps are formed between the multiple lenses 31 and the substrate 21, and ventilation for heat dissipation from the light-emitting element 22 is ensured through these gaps.

[0058] As shown in Fig. 2, adjacent lens units 13 are combined with each other by engaging the hexagonal sides 41 of the lenses 31 located in the adjacent portions b of the adjacent lens units 13 so that they fit together. The arrangement of the lenses 31 located in the adjacent portions b of the adjacent lens units 13 is the same as the pitch of the multiple lenses 31 within the lens unit 13, without any widening of the pitch. In other words, the lenses 31 of the adjacent lens units 13 are all arranged in the same arrangement. Then, the three approximately sector-shaped lens units 13 are combined in an approximately circular shape.

[0059] Some of the lenses 31 of the lens unit 13 are arranged outside the mounting range 23 of the substrate 21 and are not combined with the light-emitting elements 22. The lenses 31 arranged within the mounting range 23 of the substrate 21 and some of the lenses 31 arranged at the outermost periphery of the mounting range 23 are also not combined with the light-emitting elements 22.

[0060] The lens unit 13 is provided with positioning legs 34 and pressure legs 35 that protrude from the lens assembly 32, so that the lens unit 13 can be positioned relative to the substrate 21 using the positioning legs 34, and the pressure legs 35 can press the substrate 21 to prevent it from floating up from the heat sink 12, thereby preventing misalignment with the substrate 21 and suppressing a rise in temperature of the substrate 21.

[0061] The positioning legs 34 are located between the outermost lens 31 (adjacent portion b) of the lens assembly 32 and the inner lens 31 of the outermost lens (adjacent portion b), and therefore can be easily seen when aligning and inserting the positioning legs 34 (protrusions 47) into the positioning holes 26 of the substrate 21, improving assembly workability. Moreover, for example, when combining multiple lens units 13 adjacent to each other, the adjacent lens units 13 can be positioned close to the adjacent portions b of the adjacent lens units 13, and therefore the adjacent lens units 13 can be combined reliably.

[0062] Furthermore, the lens unit 13 has a plurality of attachment portions 33 provided at the positions of the predetermined lenses 31, so that the positions of the lenses 31 can be utilized for screw fastening.

[0063] Furthermore, since the pressure foot portion 35 is arranged within the range of an imaginary circle 49 of the radius of the lens 31 centered on the center point O between the three mounting portions 33, it is possible to press down areas of the substrate 21 that are prone to lifting up from the heat sink 12 at positions away from each of the three mounting portions 33, thereby ensuring heat dissipation from the substrate 21 to the heat sink 12 and suppressing temperature rise of the substrate 21.

[0064] By being positioned at the center point O between the three mounting parts 33, the holding leg part 35 can hold down the position that is farthest from each of the three mounting parts 33 and most likely to prevent the heat sink 12 from lifting up, thereby further suppressing the temperature rise of the substrate 21.

[0065] Furthermore, since the lens unit 13 is configured to be divided into multiple parts and assembled, warping and shrinkage that are likely to occur during molding, for example, by injection molding, can be reduced compared to when it is a large, one-piece unit, and the positional misalignment between the multiple lenses 31 and the multiple light-emitting elements 22 on the substrate 21 can be reduced, thereby obtaining the desired optical characteristics.

[0066] The lens unit 13 may be divided into two or four or more parts in the circumferential direction.

[0067] Furthermore, the positioning legs 34 of the lens unit 13 are provided with the protrusions 47 and the substrate 21 is provided with the positioning holes 26, but the positioning holes 26 may be provided on the tip surfaces of the positioning legs 34 and the protrusions 47 may be provided on the substrate 21.

[0068] Furthermore, the substrate 21 may be divided into individual lens unit arrangement sections 24. In this case, each divided substrate 21 and a similarly divided lens unit 13 form a set, and the lighting device 10 may be configured using a plurality of sets.

[0069] Although several embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be embodied in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included within the scope and spirit of the invention, and are also included in the scope of the invention and its equivalents as defined in the claims. [Explanation of symbols]

[0070] 10. Lighting equipment 13 Lens unit 21 PCB 22 Light-emitting element 31 Lens 32 Lens assembly 33 Mounting part 34 Positioning leg 35 Presser foot

Claims

1. a lens assembly formed by assembling a plurality of lenses, each of which refracts light from a light-emitting element mounted on one surface of the substrate, with a predetermined distance between their centers; a presser leg portion that protrudes from the lens assembly and presses one surface side of the substrate; a plurality of positioning legs protruding from the lens assembly for positioning the lens assembly and the substrate; Equipped with The positioning leg is positioned between the outermost lens and the innermost lens of the lens assembly. A lens unit characterized by:

2. The lens is provided with a screw-mounting attachment portion provided at a predetermined position of the lens so that the center-to-center distance from the center of each of the lenses positioned around the position is the predetermined interval.

2. The lens unit according to claim 1.

3. a substrate having a plurality of light-emitting elements mounted on one side thereof; A plurality of lens units according to claim 1 or 2 arranged on one surface of the substrate in combination with each other; A lighting device comprising:

Images