JP2014229590A - Led lighting apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an LED lighting apparatus capable of increasing the light quantity.SOLUTION: An LED lighting apparatus A1 includes: an LED light emission part 3 having a plurality of LED chips 31; a substrate 2 having a principal surface 2a for supporting the LED light emission part 3; and a lens 4 for refracting light from the LED light emission part 3. The lens 4 has: an annular surface 41 being in parallel to the principal surface 2a and having an inner peripheral edge 41a and an outer peripheral edge 41b; and a light incident recessed part 42 recessed from the inner peripheral edge 41a of the annular surface 41, on which the light from the LED light emission part 3 is incident. As viewed from the z-axis direction, the inner peripheral edge 41a of the annular surface 41 is included within the principal surface 2a, and the LED light emission part 3 is arranged inside the inner peripheral edge 41a of the annular surface 41. The distance H0 between the principal surface 2a and the annular surface 41 is smaller than the distance H2 between a portion of the LED light emission part 3 farthest from the principal surface 2a and the principal surface 2a.

Description

  The present invention relates to an LED lighting device.

  Patent Document 1 discloses an LED illumination device using a plurality of LED chips as light sources. This LED illumination device is intended to be used as a so-called spotlight. The plurality of LED chips are arranged in a matrix. The array lenses are spaced from each other at positions facing these LED chips in a posture substantially parallel to these LED chips. In addition, a condensing lens and an irradiation angle control lens are spaced apart from each other on the exit side of the array lens. Light emitted from the plurality of LED chips is condensed by the array lens, the condensing lens, and the irradiation angle control lens, or the directivity is enhanced. Thereby, it is possible to selectively irradiate light to a desired limited region.

  However, light emitted from the plurality of LED chips travels not only in the direction toward the array lens, but also in a direction inclined with respect to the direction toward the array lens or in a direction perpendicular thereto. For this reason, it is inevitable that some light leaks from between the plurality of LED chips and the array lens. Further, light leaks from between the array lens and the condenser lens or between the condenser lens and the irradiation angle control lens. For this reason, while improving the directivity of the light from a several LED chip, the shortage of the light quantity by light leakage was a problem.

JP 2007-52957 A

  The present invention has been conceived under the circumstances described above, and an object thereof is to provide an LED illumination device capable of increasing the amount of light.

  An LED lighting device provided by the present invention includes an LED light emitting unit having a plurality of LED chips, a substrate having a main surface that supports the LED light emitting unit, and a lens that refracts light from the LED light emitting unit. The lens includes an annular surface having an inner peripheral end and an outer peripheral end parallel to the main surface, and an incident concave portion that is recessed from the inner peripheral end of the annular surface and into which light from the LED light emitting unit is incident. And the inner peripheral end of the annular surface is included in the main surface in the normal direction view of the main surface, and the LED light emitting portion is the inner periphery of the annular surface. The distance from the main surface to the annular surface is arranged inside the end, and is smaller than the distance between the main surface and a portion of the LED light emitting unit that is farthest from the main surface. It is said.

  In a preferred embodiment of the present invention, the annular surface is parallel to the main surface.

  In preferable embodiment of this invention, the said LED light emission part has an output surface parallel to the said main surface, The distance from the said main surface to the said annular surface is from the said main surface to the said output surface. Is less than the distance.

  In a preferred embodiment of the present invention, a gap is provided between the annular surface and the main surface.

  In preferable embodiment of this invention, the said lens condenses the light from the said LED light emission part, or improves directivity.

  In a preferred embodiment of the present invention, the lens has a reflection inclination that is inclined so as to be separated from the LED light emitting unit in a direction perpendicular to the normal direction as the distance from the main surface increases in the normal direction of the main surface. Has a surface.

  In a preferred embodiment of the present invention, the reflective inclined surface overlaps the incident recess in the normal direction of the main surface.

  In a preferred embodiment of the present invention, the substrate has a base material made of ceramics.

  In a preferred embodiment of the present invention, the plurality of LED chips are mounted on the substrate.

  In a preferred embodiment of the present invention, the LED light emitting section includes a dam section surrounding the plurality of LED chips, a sealing resin filling the region surrounded by the dam section and covering the plurality of LED chips. .

  In a preferred embodiment of the present invention, the sealing resin is a transparent resin and a fluorescent material that emits light having a wavelength different from that of the light from the LED chip by being excited by light from the LED chip. And including.

  In a preferred embodiment of the present invention, a case for supporting the substrate is provided.

  In a preferred embodiment of the present invention, the case is made of aluminum or an aluminum alloy.

  In a preferred embodiment of the present invention, the case has an intermediate plate portion to which the substrate is fixed.

  In a preferred embodiment of the present invention, a substrate recess for fixing the substrate is formed in the middle plate portion.

  In a preferred embodiment of the present invention, the lens has a positioning surface facing away from the main surface, and the case has a contact surface that contacts the positioning surface of the lens.

  In a preferred embodiment of the present invention, the lens is formed with a pair of locking pieces that protrude in opposite directions in a direction perpendicular to the normal direction of the main surface. A pair of fixtures having a lens fixing piece for fixing the pair of locking pieces to the middle plate portion of the case are provided.

  In a preferred embodiment of the present invention, the pair of locking pieces protrude from the outer peripheral end of the annular surface.

  In a preferred embodiment of the present invention, the pair of locking pieces are located outside the substrate in the normal direction of the main surface.

  In a preferred embodiment of the present invention, one of the pair of fixtures has a substrate fixing piece for fixing the substrate to the middle plate portion of the case.

  In a preferred embodiment of the present invention, the lens fixing pieces of the pair of fixing tools are spaced apart from each other with the LED light emitting portion interposed in a first direction perpendicular to the normal direction of the main surface. And extend in opposite directions in a second direction perpendicular to the first direction.

  In preferable embodiment of this invention, the light emission side cable connected to the said LED light emission part is provided, The said board | substrate is formed on the said base material, and is electrically connected with these LED chips, The said light emission side cable of The wiring pattern has two pad portions in which two tip portions are separately bonded, and the two pad portions are arranged outside the outer peripheral end of the lens.

  In a preferred embodiment of the present invention, the two pad portions are provided on the opposite side of the pair of fixtures having the substrate fixing piece.

  In a preferred embodiment of the present invention, a cable hole through which the light emitting side cable is inserted is formed in the middle plate portion.

  In a preferred embodiment of the present invention, a power supply unit disposed outside the case and a power supply cable extending from the power supply unit are provided, and a power supply connector is attached to the power supply cable. The light emitting side cable is attached with a light emitting side connector connected to the power source side connector.

  In a preferred embodiment of the present invention, the cable hole has a size through which the light emitting side connector can pass.

  In a preferred embodiment of the present invention, the pair of fixtures that do not have the board fixing piece includes the cable hole as viewed in the normal direction of the main surface.

  In a preferred embodiment of the present invention, the case has a plurality of fins extending from the middle plate portion to the side opposite to the substrate.

  In a preferred embodiment of the present invention, the case includes an umbrella portion that covers the plurality of fins from a direction perpendicular to the normal direction of the main surface.

  In a preferred embodiment of the present invention, the plurality of fins and the umbrella portion are separated from each other.

  According to the present invention, most of the light emitted from the LED light emitting unit can be incident on the incident recess. Therefore, it can suppress that the light from the said LED light emission part leaks, and can increase the light quantity of the said LED illuminating device. .

  Other features and advantages of the present invention will become more apparent from the detailed description given below with reference to the accompanying drawings.

It is a perspective view which shows the LED lighting apparatus based on 1st Embodiment of this invention. It is a side view which shows the LED lighting apparatus of FIG. It is a principal part top view which shows the LED lighting apparatus of FIG. It is principal part sectional drawing in alignment with the IV-IV line of FIG. It is a principal part expanded sectional view which shows the LED lighting apparatus of FIG. It is a top view which shows the case used for the illuminating device of FIG. It is a bottom view which shows the case used for the illuminating device of FIG. It is a top view which shows the board | substrate and LED light emission part which are used for the illuminating device of FIG. It is sectional drawing which follows the IX-IX line of FIG. It is a principal part top view which shows the assembly process of the LED lighting apparatus of FIG. It is a principal part expanded sectional view which shows the assembly process of the LED lighting apparatus of FIG. It is a perspective view which shows the lens used for the illuminating device of FIG. It is a front view which shows the lens used for the illuminating device of FIG. It is a top view which shows the lens used for the illuminating device of FIG. It is a bottom view which shows the lens used for the illuminating device of FIG.

  Hereinafter, preferred embodiments of the present invention will be specifically described with reference to the drawings.

  1 to 5 show an LED lighting device according to a first embodiment of the present invention. The LED illumination device A1 of the present embodiment includes a case 1, a substrate 2, an LED light emitting unit 3, a lens 4, fixtures 5A and 5B, and a power supply unit 6. The LED illumination device A1 of the present embodiment is suitably used as a so-called spotlight, for example, for applications that illuminate clothes, foods, and the like.

  FIG. 1 is a perspective view of the LED lighting device A1, and FIG. 2 is a side view. FIG. 3 is a plan view of a principal part in which the case 1, the substrate 2, and the LED light emitting unit 3 are represented by solid lines and a part of the lens 4 is represented by imaginary lines. FIG. 4 is a main part sectional view in the yz plane along the line IV-IV in FIG. 3, and FIG. 5 is an enlarged main part sectional view.

  Case 1 accommodates substrate 2, LED light emitting unit 3, and lens 4, and is made of metal such as aluminum or aluminum alloy. The case 1 has an intermediate plate part 11, a cylindrical part 12, a plurality of fins 13 and an umbrella part 14. FIG. 6 is a plan view showing the single case 1 and FIG. 7 is a rear view.

  The middle plate portion 11 is a plate-like portion that extends in parallel to the xy plane, and has a circular shape in the present embodiment. The middle plate portion 11 includes a substrate recess 11a, a cable hole 11b, two cable grooves 11c, a plurality of protrusions 11d, and bolt holes 11e.

  The substrate recess 11a is for fixing the substrate 2, and is a relatively shallow recess recessed in the z direction. In the present embodiment, the substrate recess 11a has a substantially rectangular shape having four sides along the x direction and the y direction when viewed in the z direction.

  The cable hole 11b passes through the middle plate portion 11. The cable hole 11b is provided at a position slightly spaced in the y direction with respect to the substrate recess 11a. In the present embodiment, the cable hole 11b has a rectangular shape when viewed in the z direction. The cable hole 11b is for inserting a light emitting side cable 72 described later, and in the present embodiment, the cable hole 11b has a size capable of passing through a light emitting side connector 72a described later.

  The two cable grooves 11c are spaced apart in the x direction across the cable hole 11b. Each cable groove 11c extends from the corner of the substrate recess 11a to the side of the cable hole 11b.

  The plurality of protrusions 11d are for attaching the fixture 5. In the present embodiment, two protrusions 11d are arranged on both sides in the y direction across the substrate recess 11a. The plurality of bolt holes 11e are for attaching the fixtures 5A and 5B. In the present embodiment, one bolt hole 11e is arranged on both sides in the y direction across the substrate recess 11a.

  The cylindrical part 12 is connected to the middle plate part 11 and has a substantially cylindrical shape with the z direction as the axial direction. The cylindrical portion 12 accommodates the lens 4. A contact surface 12 a is formed in the vicinity of the upper end of the tubular portion 12 in the z direction. The abutting surface 12a faces the side where the cylindrical portion 12 opens in the z direction, and is annular in this embodiment.

  The plurality of fins 13 are for radiating heat from the LED light emitting unit 3 to the outside. Each of the plurality of fins 13 has a plate shape, and is connected to the middle plate portion 11 on the side opposite to the cylindrical portion 12. The plurality of fins 13 are each parallel to the yz plane, and are arranged at substantially equal pitches in the x direction.

  The umbrella part 14 is a curved plate-like member that is connected to the same side as the plurality of fins 13 to the middle plate part 11 and extends in the z direction. As clearly shown in FIG. 7, the umbrella portion 14 has an arc shape with a central angle of about 180 degrees when viewed in the z direction. The umbrella portion 14 is spaced from the plurality of fins 13 in the y direction. The dimension of the umbrella part 14 in the x direction is larger than the length occupied by the plurality of fins 13 in the x direction. Further, as clearly shown in FIG. 2, the z-direction dimension of the umbrella portion 14 is larger than the z-direction dimensions of the plurality of fins 13.

  The substrate 2 supports the LED light emitting unit 3. FIG. 8 is a plan view including the substrate 2, and FIG. 9 is a cross-sectional view in the zx plane along the line IX-IX in FIG. In FIG. 9, the wiring pattern 22 is omitted. In the present embodiment, the substrate 2 has a base material 21 and a wiring pattern 22.

  The base material 21 is made of ceramics such as alumina, and has a rectangular shape having four sides along the x direction and the y direction in the present embodiment. The substrate 2 has a main surface 2a. The main surface 2a is a surface of the substrate 21 on which the LED light emitting unit 3 is disposed. In the present embodiment, the normal direction of the main surface 2a is defined as the z direction.

  The wiring pattern 22 is formed on the base material 21 and is made of a metal such as Cu, Ni, Ag, or Au. The wiring pattern 22 is electrically connected to a plurality of LED chips 31 of the LED light emitting unit 3 described later. The wiring pattern 22 has two pad portions 22a. As clearly shown in FIG. 8, the two pad portions 22 a are provided at positions close to the two corner portions located on one side in the y direction of the base material 21.

  The LED light emitting unit 3 is a light emitting part of the LED lighting device A <b> 1, and is disposed at the approximate center of the substrate 2. In the present embodiment, the LED light emitting unit 3 includes a plurality of LED chips 31, a dam portion 32, and a sealing resin 33.

  The plurality of LED chips 31 have, for example, a GaN-based semiconductor layer, and emit blue light in the present embodiment. The plurality of LED chips 31 are directly mounted on the wiring pattern 22 of the substrate 2 and arranged in a matrix or a staggered pattern.

  The dam portion 32 surrounds the plurality of LED chips 31 and has a circular shape as viewed in the z direction in the present embodiment. The dam portion 32 is made of, for example, a silicone resin, and is preferably made of a white silicone resin. As shown in FIG. 9, the weir portion 32 has a shape slightly raised in the z direction from the main surface 2 a of the substrate 2. The height of the weir portion 32 in the z direction is, for example, about 0.4 to 1.0 mm.

  The sealing resin 33 is filled in a region surrounded by the dam portion 32 and covers the plurality of LED chips 31. The sealing resin 33 is made of, for example, a material in which a fluorescent material is mixed into a transparent silicone resin or epoxy resin. The fluorescent material emits yellow light when excited by blue light from the LED chip 31, for example. Alternatively, as the fluorescent material, a material that emits green light and a material that emits red light when excited by blue light from the LED chip 31 may be used.

  By appropriately setting the fluorescent material mixed in the sealing resin 33, the LED light emitting unit 3 can emit white light having different color temperatures. In the present embodiment, a configuration that emits white light having a color temperature of, for example, 3000K, 3500K, 4000K, and 5000K can be realized by a plurality of types of sealing resins 33.

  The sealing resin 33 has an emission surface 33a. The emission surface 33a is a surface facing the z direction, and is substantially parallel to the main surface 2a of the substrate 2. The white light described above is emitted from the emission surface 33a. The distance in the z direction from the main surface 2a to the emission surface 33a is substantially the same as or slightly smaller than the height in the z direction of the weir portion 32.

  The lens 4 allows the light from the LED light emitting unit 3 to enter, condense, or emit with increased directivity. The lens 4 is made of a transparent resin, and examples of the material include PMMA resin (polymethyl methacrylate resin), PC resin (polycarbonate resin), PS resin (polystyrene resin), and the like. The lens 4 of the present embodiment includes an annular surface 41, an incident recess 42, an exit surface 43, an exit recess 44, a reflective inclined surface 45, a flange 46, and two locking pieces 47. 12 to 15 are a perspective view, a front view, a plan view, and a bottom view showing the lens 4.

  The annular surface 41 faces away from the main surface 2a of the substrate 2 in the z direction, and has an inner peripheral end 41a and an outer peripheral end 41b. In the present embodiment, the annular surface 41 has an annular shape, but is not limited thereto, and may be any shape that can have the inner peripheral end 41a and the outer peripheral end 41b, such as an elliptical annular shape or a rectangular annular shape. In FIG. 3, the annular surface 41, the inner peripheral end 41a and the outer peripheral end 41b are indicated by imaginary lines.

  As shown in FIG. 3, the annular surface 41 is arranged so that the substrate 2 and a part thereof overlap each other when viewed in the z direction. The inner peripheral end 41 a is an inner end edge of the annular surface 41. The inner peripheral end 41a is included in the main surface 2a of the substrate 2 when viewed in the z direction. Moreover, the LED light emission part 3 is arrange | positioned inside the inner peripheral end 41a in z direction view. In the present embodiment, the outer shape of the LED light emitting unit 3 and the inner peripheral end 41a are concentric.

  The outer peripheral end 41 b is an outer edge of the annular surface 41. The outer peripheral end 41 b protrudes from the main surface 2 a of the substrate 2 at both ends in the y direction when viewed in the z direction. For this reason, the portions near both ends of the annular surface 41 in the y direction protrude from the main surface 2 a of the substrate 2.

  As shown in FIGS. 4 and 5, a part of the annular surface 41 faces the main surface 2 a of the substrate 2. In the present embodiment, the distance H0 between the annular surface 41 and the main surface 2a is set to about 0.1 mm, for example. Since the distance H2 which is the height from the main surface 2a of the weir part 32 is about 0.4 to 1.0 mm, the distance H0 is smaller than the distance H2. The distance H2 is the height of the portion of the LED light emitting unit 3 that is farthest from the main surface 2a in the z direction. The distance H0 is smaller than the distance H1 from the main surface 2a of the emission surface 33a.

  The incident recess 42 is recessed in the z direction from the inner peripheral end 41 a of the annular surface 41, and is arranged to house the LED light emitting unit 3 or cover the LED light emitting unit 3 as shown in FIGS. 4 and 5. . The incident recess 42 has, for example, a truncated cone shape, and is concentric with the annular surface 41 and the LED light emitting unit 3 when viewed in the z direction. The light emitted from the LED light emitting unit 3 enters the incident recess 42.

  The exit surface 43 is a surface facing away from the annular surface 41 and is a surface from which light incident from the entrance recess 42 exits. The outer shape of the emission surface 43 is circular. The exit recess 44 is recessed in the z direction from the center of the exit surface 43, and has a truncated cone shape, for example. In the z-direction view, the exit recess 44 overlaps the entrance recess 42 and is concentric with each other. By providing the entrance recess 42 and the exit recess 44, the lens 4 is thin in the vicinity of the center in the x and y directions.

  The reflective inclined surface 45 is formed so as to connect the vicinity of the outer peripheral end 41b of the annular surface 41 and the vicinity of the outer peripheral end of the emission surface 43, and the LED light emitting unit 3 in the x direction or the y direction as it is farther from the main surface 2a in the z direction. It is inclined so that the distance from the center becomes large. The reflective inclined surface 45 and the incident recess 42 overlap each other in the z direction.

  Of the light incident on the incident recess 42, the light traveling substantially along the z direction exits from the exit recess 44. On the other hand, of the light incident on the incident concave portion 42, the light traveling in a direction inclined by a certain amount or more with respect to the z direction is reflected from the reflection inclined surface 45 and then emitted from the emission surface 43.

  The collar portion 46 is an annular portion that is formed in the vicinity of the outer peripheral edge of the emission surface 43 and protrudes along the xy plane. A positioning surface 46 a is formed on the flange portion 46. The positioning surface 46a faces away from the main surface 2a and faces the same side as the annular surface 41. In the present embodiment, the positioning surface 46a is an annular surface.

  The two locking pieces 47 protrude outward from the outer peripheral end 41b of the annular surface 41 along the xy plane. The two locking pieces 47 protrude to the opposite sides, and protrude in the y direction when the lens 4 is attached to the case 1 as shown in FIG. In this state, the two locking pieces 47 are located outside the main surface 2a of the substrate 2 when viewed in the z direction.

  The two fixtures 5A and 5B are for fixing the lens 4 to the case 1. Further, the fixing tool 5 </ b> A functions to fix the substrate 2 to the case 1. The two fixtures 5A and 5B are made of a material that allows good strength and appropriate elastic deformation, and are made of, for example, metal or resin.

  The fixture 5 </ b> A includes a main body 51, a lens fixing piece 52, and two substrate fixing pieces 53. The main body 51 occupies most of the fixture 5A, and is attached to one side (lower side in the figure) in the y direction with respect to the substrate recess 11a in the middle plate 11 of the case 1 as shown in FIG. It has been. The fixing tool 5A is attached to the middle plate portion 11 by fastening the bolt 55 to the bolt hole 11e described above through a hole provided in the fixing tool 5A. Further, the two protrusions 11d of the middle plate portion 11 are fitted into the other two holes provided in the fixing tool 5A.

  The lens fixing piece 52 extends to the left in the x direction from the one end portion in the y direction of the main body 51 via the step portion, and is slightly higher in the z direction than the main body 51. The two substrate fixing pieces 53 extend from both ends in the x direction of the main body 51 in the y direction, and the tips thereof reach the vicinity of the center in the y direction of the substrate recess 11a.

  The fixture 5 </ b> B includes a main body 51 and a lens fixing piece 52. The main body 51 is a part that occupies most of the fixture 5B, and is attached to the other side (upper side in the figure) in the y direction with respect to the substrate recess 11a in the middle plate part 11 of the case 1 as shown in FIG. It has been. The fixing tool 5B is attached to the middle plate portion 11 by fastening the bolt 55 to the bolt hole 11e described above through a hole provided in the fixing tool 5B. Further, the two protrusions 11d of the intermediate plate portion 11 are fitted into the other two holes provided in the fixture 5B.

  The lens fixing piece 52 extends rightward in the x direction from one end of the main body 51 in the y direction via a stepped portion, and is slightly higher in the z direction than the main body 51.

  The substrate 2 is fixed to the case 1 by being pressed against the bottom surface of the substrate recess 11a of the intermediate plate portion 11 by the two substrate fixing pieces 53 of the fixing tool 5A. For convenience of understanding, FIG. 9 shows two substrate fixing pieces 53 together with the substrate 2 and the LED light emitting unit 3. Each substrate fixing piece 53 has a protrusion 53a. The protrusion 53a is formed, for example, by extruding and deforming a part near the tip of the substrate fixing piece 53. When the projection 53a comes into contact with the main surface 2a of the substrate 2, the substrate fixing piece 53 is bent by the height of the projection 53a. The elastic force generated by this bending becomes a holding force for fixing the substrate 2 to the case 1.

  The lens 4 is attached to the case 1 by the two engaging pieces 47 engaging the lens fixing pieces 52 of the fixtures 5A and 5B separately and the positioning surface 46a contacting the contact surface 12a of the case 1. Fixed. For example, with the fixtures 5A and 5B and the substrate 2 fixed to the case 1, the lens 4 is inserted from the opening of the cylindrical portion 12 of the case 1 in the z direction. At this time, as shown in FIG. 10, the z-direction viewing positions of the two locking pieces 47 of the lens 4 and the lens fixing pieces 52 of the fixtures 5A and 5B are shifted. Then, after the position of the locking piece 47 in the z direction is closer to the middle plate portion 11 than the lens fixing piece 52, the entire lens 4 is rotated in the direction of the arrow in FIG.

  FIG. 11 is an enlarged cross-sectional view of a main part showing the locking piece 47 and the lens fixing piece 52 of the fixture 5A in this rotation. A projection 52 a is formed on the lens fixing piece 52. The protrusion 52a protrudes downward in the z direction, and is formed, for example, by pushing and deforming a portion near the tip of the lens fixing piece 52 downward in the z direction. On the other hand, a chamfered portion 47 a is formed on the locking piece 47. The chamfered portion 47a is a portion in which the side of the locking piece 47 that is located above the z direction is processed obliquely. The chamfered portion 47a is positioned forward in the rotational direction in the rotation described above. For this reason, when the locking piece 47 tries to enter between the lens fixing piece 52 and the middle plate portion 11, the chamfered portion 47a looks like lifting the protrusion 52a. When the lens 4 is further rotated, the entire locking piece 47 passes through the protrusion 52a. Accordingly, the lens fixing piece 52 is in the illustrated posture, and the locking piece 47 is pushed downward in the z direction by the lens fixing piece 52. The other locking piece 47 of the lens 4 is fixed by the lens fixing piece 52 of the fixing tool 5B in the same manner and simultaneously.

  Although the two locking pieces 47 of the lens 4 are pressed downward in the z direction by the lens fixing pieces 52 of the fixtures 5A and 5B, the positioning surface 46a of the lens 4 and the contact surface 12a of the case 1 as shown in FIG. Abut. The position of the lens 4 in the z direction is determined by this contact. In the present embodiment, the distance H0 between the annular surface 41 of the lens 4 and the main surface 2a of the substrate 2 is set to about 0.1 mm in a state where the positioning surface 46a and the contact surface 12a are in contact. ing.

  The power supply unit 6 functions to convert, for example, input commercial AC 100V power into DC power suitable for causing the LED light emitting unit 3 to emit light. Moreover, in this embodiment, the power supply part 6 is used as a site | part attached to a ceiling etc. The power supply unit 6 includes a power supply cover 61, a power supply board 62, and a plurality of electronic components 63.

  The power supply cover 61 accommodates the power supply board 62 and the plurality of electronic components 63, and in the present embodiment, is a rectangular parallelepiped member made of a metal plate. The power supply board 62 is a wiring board made of, for example, a long rectangular glass epoxy resin. The plurality of electronic components 63 are mounted on the power supply board 62, and are, for example, a transformer, a coil, a capacitor, a resistor, an IC, and the like.

  In the present embodiment, the power supply unit 6 and the case 1 are connected by a stay 81. The stay 81 is attached near one end of the power supply unit 6 and on both sides of the case 1. The stay 81 can be rotated by a predetermined angle with respect to the power supply unit 6, and the case 1 can be rotated by a predetermined angle with respect to the stay 81.

  A power supply side cable 71 is connected to the power supply unit 6. In addition, a light emitting side cable 72 that is electrically connected to the LED light emitting unit 3 is connected to the substrate 2. A power supply side connector 71 a is attached to the power supply side cable 71, and a light emission side connector 72 a is attached to the light emission side cable 72. The power supply side connector 71a and the light emission side connector 72a are fitted to each other, whereby the power supply side cable 71 and the light emission side cable 72 are electrically connected.

  As shown in FIG. 3, in this embodiment, the light emission side cable 72 is what is called a 2 core wire, and the front-end | tip on the LED light emission part 3 side is divided into two front-end | tip parts. These tip portions are joined to the two pad portions 22a of the wiring pattern 22 of the substrate 2 separately. This joining is performed by solder, for example. Further, the two tip portions of the light emitting side cable 72 are disposed in the two cable grooves 11 c of the middle plate portion 11. And the light emission side cable 72 has penetrated the cable hole 11b of the intermediate | middle board part 11, and is extended in the side with the several fin 13. FIG. In the present embodiment, the cable hole 11b is covered with the main body 51 of the fixture 5A as viewed in the z direction.

  Next, the operation of the LED lighting device A1 will be described.

  According to the present embodiment, as shown in FIG. 5, the distance between the annular surface 41 of the lens 4 and the main surface 2a, rather than the distance H2 between the highest portion in the z direction of the LED light emitting unit 3 and the main surface 2a. H0 is smaller. For this reason, most of the light emitted from the LED light emitting unit 3 can be incident on the incident recess 42. Therefore, it can suppress that the light from LED light emission part 3 leaks, and can increase the light quantity of LED lighting apparatus A1.

  Since the annular surface 41 is parallel to the main surface 2a, the entire annular surface 41 is located at a distance H0 from the main surface 2a. Thereby, it is possible to avoid an unreasonably large distance between a part of the annular surface 41 and the main surface 2a, which is preferable for preventing light leakage.

  Further, since the distance H0 is smaller than the distance H1 from the emission surface 33a of the LED light emitting unit 3 to the main surface 2a, light leakage from the LED light emitting unit 3 can be more preferably prevented.

  By providing a gap between the annular surface 41 and the main surface 2a, it is possible to prevent the substrate 2 from being damaged by the lens 4 coming into contact with the substrate 2.

  When the reflection inclined surface 45 overlaps with the incident concave portion 42 in the z direction, when light that has traveled from the LED light emitting portion 3 at an angle inclined by a certain degree or more with respect to the z direction enters the incident concave portion 42, this light is reflected on the reflective inclined surface. The possibility of reflection by 45 increases. This is preferable for increasing the light quantity of the LED lighting device A1.

  Since the board | substrate 2 has the base material 21 which consists of ceramics, the heat | fever from LED light emission part 3 can be more efficiently transmitted to case 1. FIG. Since the plurality of LED chips 31 are mounted on the substrate 2, the heat transfer efficiency can be further increased.

  Since the substrate recess 11a is formed in the middle plate portion 11, the substrate 2 can be more reliably fixed.

  By bringing the positioning surface 46a of the lens 4 and the contact surface 12a of the case 1 into contact with each other, for example, the position of the lens 4 in the z direction can be appropriately determined with respect to the case 1 without damaging the substrate 2. .

  The lens 4 can be fixed to be pressed against the case 1 by fixing the pair of locking pieces 47 of the lens 4 with the pair of fixing tools 5A and 5B. Since the pair of locking pieces 47 protrude from the outer peripheral end 41b of the annular surface 41 and are located outside the substrate 2 in the z direction view, the locking pieces 47 are temporarily pressed by the fixtures 5A and 5B. It is possible to avoid the locking piece 47 from coming into contact with the substrate 2 even if it is bent.

  By providing the substrate fixing piece 53 on the fixture 5A, the lens 4 and the substrate 2 can be fixed to the case 1 in a lump. Further, it is possible to prevent the relative position between the lens 4 and the substrate 2 from being unduly shifted. As shown in FIG. 10, the configuration in which the pair of locking pieces 47 are engaged with the lens fixing pieces 52 of the fixtures 5 </ b> A and 5 </ b> B by rotating the lens 4 can fix the lens 4 easily and reliably. There is an advantage. In addition, the lens 4 having a narrow angle, a medium angle, a wide angle or the like having a different degree of condensing can be arbitrarily replaced.

  The two pad portions 22a of the wiring pattern 22 are arranged on the opposite side in the y direction to the fixture 5A having the substrate fixing piece 53. Further, the light emitting side cables 72 soldered to these pad portions 22a are inserted into cable holes 11b provided on the opposite side to the fixture 5A in the y direction. For this reason, once the lens 4 is removed from the LED lighting device A1 in a completed state, the substrate 2 can be removed from the middle plate portion 11 of the case 1 without removing the fixtures 5A and 5B. The cable hole 11b has a size that allows the light emitting side connector 72a to pass therethrough. Therefore, after the substrate 2 is removed, for example, it can be easily and reliably replaced with the substrate 2 on which the LED light emitting units 3 having different specifications are mounted.

  Thus, the easy exchange of the lens 4 and the substrate 2 means that it is not always necessary to have a plurality of types of LED lighting devices A1 having different specifications of the lens 4 and the LED light emitting unit 3 as stock. There are advantages. That is, the LED illumination device A1 in which the lens 4 and the substrate 2 are completely attached, or an intermediate product in which only the lens 4 and the substrate 2 are not completely attached are prepared, and the lens 4 and the substrate 2 are matched to the needs of users and the like. May be replaced or attached.

  Since the plurality of fins 13 are covered with the umbrella portion 14, dust or the like can be prevented from accumulating on the plurality of fins 13. When dust accumulates on the plurality of fins 13, cleaning is troublesome, but the dust accumulated on the umbrella portion 14 can be easily removed. This is suitable for using the LED lighting device A1 for, for example, lighting of foodstuffs.

  Since the plurality of fins 13 and the umbrella portion 14 are separated from each other, the flow of air around the plurality of fins 13 can be promoted, and the heat dissipation efficiency from the LED light emitting unit 3 can be improved. .

  The LED lighting device according to the present invention is not limited to the embodiment described above. The specific configuration of each part of the LED lighting device according to the present invention can be varied in design in various ways.

  The LED light emitting section referred to in the present invention is not limited to a configuration in which a plurality of LED chips are directly mounted on a substrate. The LED light emitting unit may be configured by mounting a plurality of LED modules each having an LED chip on a substrate.

A1 LED lighting device 1 Case 11 Middle plate portion 11a Substrate recess 11b Cable hole 11c Cable groove 11d Projection 11e Bolt hole 12 Tubular portion 12a Contact surface 13 Fin 14 Umbrella portion 2 Substrate 2a Main surface 21 Base material 22 Wiring pattern 22a Pad Part 3 LED light emitting part 31 LED chip 32 dam part 33 sealing resin 33a exit surface 4 lens 41 annular surface 41a inner peripheral end 41b outer peripheral end 42 incident recess 43 exit surface 44 exit recess 45 reflective inclined surface 46 flange 46a positioning surface 47 Locking piece 47a Chamfered part 5A Fixing tool 5B Fixing tool 51 Body part 52 Lens fixing piece 52a Projection 53 Substrate fixing piece 53a Projection 55 Bolt 6 Power supply part 61 Power supply cover 62 Power supply board 63 Electronic component 71 Power supply side cable 71a Power supply side connector 72 Light-emitting side cable 72a Light-emitting side connector 81 Stay

Claims (30)

An LED light emitting unit having a plurality of LED chips;
A substrate having a main surface for supporting the LED light emitting unit;
A lens that refracts light from the LED light emitting unit,
The lens includes an annular surface having an inner peripheral end and an outer peripheral end parallel to the main surface, and an incident concave portion that is recessed from the inner peripheral end of the annular surface and into which light from the LED light emitting unit is incident. And
When viewed in the normal direction of the main surface, the inner peripheral end of the annular surface is included in the main surface, and the LED light emitting unit is disposed inside the inner peripheral end of the annular surface. ,
The distance from the said main surface to the said annular surface is smaller than the distance of the site | part most spaced apart from the said main surface among the said LED light emission parts, and the said main surface, The LED illuminating device characterized by the above-mentioned.   The LED illumination device according to claim 1, wherein the annular surface is parallel to the main surface. The LED light emitting unit has an emission surface parallel to the main surface,
The LED lighting device according to claim 2, wherein a distance from the main surface to the annular surface is smaller than a distance from the main surface to the emission surface.   The LED lighting device according to any one of claims 1 to 3, wherein a gap is provided between the annular surface and the main surface.   The LED illumination device according to any one of claims 1 to 4, wherein the lens condenses light from the LED light emitting unit or enhances directivity.   6. The lens according to claim 1, wherein the lens has a reflective inclined surface that is inclined so as to move away from the LED light emitting unit in a direction perpendicular to the normal direction as the distance from the main surface increases in the normal direction of the main surface. The LED lighting apparatus in any one.   The LED lighting device according to claim 6, wherein the reflective inclined surface overlaps the incident concave portion in a normal direction of the main surface.   The LED lighting device according to claim 1, wherein the substrate has a base material made of ceramics.   The LED lighting device according to claim 8, wherein the plurality of LED chips are mounted on the substrate. The LED light emitting unit includes a weir unit surrounding the plurality of LED chips,
The LED lighting device according to claim 9, further comprising: a sealing resin that fills a region surrounded by the dam portion and covers the plurality of LED chips.   The said sealing resin contains transparent resin and the fluorescent material which emits the light of the wavelength different from the light from the said LED chip, when excited by the light from the said LED chip. LED lighting device.   The LED lighting device according to claim 1, further comprising a case that supports the substrate.   The LED lighting device according to claim 12, wherein the case is made of aluminum or an aluminum alloy.   The LED case according to claim 12 or 13, wherein the case has an intermediate plate portion to which the substrate is fixed.   The LED lighting device according to claim 14, wherein a substrate recess for fixing the substrate is formed in the middle plate portion. The lens has a positioning surface facing away from the main surface,
The LED lighting device according to claim 14 or 15, wherein the case has a contact surface that contacts the positioning surface of the lens. The lens is formed with a pair of locking pieces protruding in opposite directions in a direction perpendicular to the normal direction of the main surface,
The LED lighting device according to claim 16, further comprising a pair of fixtures having a lens fixing piece for fixing the pair of locking pieces to the middle plate portion of the case.   The LED lighting device according to claim 17, wherein the pair of locking pieces protrude from the outer peripheral end of the annular surface.   The LED lighting device according to claim 18, wherein the pair of locking pieces are located outside the substrate in a normal direction view of the main surface.   20. The LED lighting device according to claim 17, wherein one of the pair of fixtures has a board fixing piece for fixing the board to the middle plate portion of the case.   The lens fixing pieces of the pair of fixing tools are spaced apart from each other with the LED light-emitting portion in the first direction perpendicular to the normal direction of the main surface, and with respect to the first direction. The LED lighting device according to claim 20, wherein the LED lighting devices extend in opposite directions in a second direction that is perpendicular to each other. Equipped with a light emitting side cable connected to the LED light emitting unit,
The substrate has a wiring pattern formed on the base material, electrically connected to the plurality of LED chips, and having two pad portions in which two tip portions of the light emitting side cable are joined to each other,
The LED lighting device according to claim 21, wherein the two pad portions are disposed outside the outer peripheral end of the lens.   23. The LED lighting device according to claim 22, wherein the two pad portions are provided on the opposite side of the pair of fixtures having the substrate fixing piece.   The LED lighting device according to claim 23, wherein a cable hole through which the light emitting side cable is inserted is formed in the middle plate portion. A power supply unit arranged outside the case, and a power supply side cable extending from the power supply unit,
A power supply side connector is attached to the power supply side cable.
The LED lighting device according to claim 24, wherein a light emitting side connector connected to the power source side connector is attached to the light emitting side cable.   26. The LED lighting device according to claim 25, wherein the cable hole has a size through which the light emitting side connector can pass.   27. The LED illumination device according to claim 26, wherein the pair of fixtures that do not have the board fixing piece includes the cable hole in a normal direction view of the main surface.   The LED lighting device according to any one of claims 1 to 27, wherein the case has a plurality of fins extending from the middle plate portion to a side opposite to the substrate.   The LED lighting device according to claim 28, wherein the case has an umbrella portion that covers the plurality of fins from a direction perpendicular to a normal direction of the main surface.   30. The LED lighting device according to claim 29, wherein the plurality of fins and the umbrella portion are separated from each other.

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