JP2013054960A - Lighting fixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting fixture in which insulation is secured and adhesion between an LED board and a heat radiation member is improved.SOLUTION: The lighting fixture includes an LED board 130 having a board through-hole 133; a heat radiation section 110 having a board mounting surface 111 for mounting the LED board 130 thereon, a recessed section 112 arranged at a location corresponding to the board through-hole 133, and a female screw section 112a arranged at a bottom of the recessed section 112; board mounting screws 131; and a contact section having a disk through-hole 132j which causes a screw shaft section 131b to penetrate therethrough and locks a screw head 131a, the disk through-hole 132j being communicated with the board through-hole 133, and arranged so that a rear face 132f of the contact section makes contact with a mounting surface 134 around the board through-hole 133. The board mounting screw 131 fixes the LED board 130 to the board mounting surface 111 by pushing the contact section to the mounting surface 134 while the screw shaft section 131b penetrates the disk through-hole 132j and the board through-hole 133 and a male screw section 131c is screwed into the female screw section 112a.

Description

  The present invention relates to a lighting fixture using LEDs, for example.

  In recent years, there has been a demand for higher output in lighting fixtures using LEDs, and the light emitting surface of the lighting fixtures has become larger. In addition, with the increase in the size of the light emitting surface of the appliance, the light source substrate on which the LED is mounted as a light source has become larger, and the need to efficiently dissipate the heat generated by the LED has increased. A light source substrate on which an LED is mounted as a light source is often a metal substrate such as aluminum, and heat generated by the LED is dissipated by thermally connecting the light source substrate to a heat dissipation member.

  As a method of attaching the LED substrate to the heat dissipation member, there is a method of attaching the peripheral portion of the LED substrate by pressing it against the heat dissipation member (see Patent Document 1).

JP 2011-134453 A

  When the light source substrate on which the LED is mounted as a light source becomes large, it is necessary to increase the adhesion between the light source substrate and the heat dissipation member in order to improve the heat dissipation efficiency. However, in the conventional method of attaching the peripheral portion of the light source substrate to the heat radiating member, the adhesion of the central portion of the light source substrate is low. When the light source substrate becomes large, the adhesion between the central portion of the light source substrate and the heat radiating member becomes particularly low, and the heat radiating property becomes low.

  Therefore, there is a method of fixing the central portion of the light source substrate to the heat radiating member with screws or the like. However, when simply fixing with a metal screw, there is a problem that it is difficult to secure an insulation distance between the screw and the light source substrate. In addition, when a screw hole is provided in a metal light source substrate, the metal is exposed from the cross section of the edge that forms the screw hole, and thus there is a problem that it is difficult to secure an insulation distance between the cross section of the screw hole and the heat dissipation member .

  Although it is conceivable to employ a resin screw as an insulating material for fixing the central portion of the light source substrate, the resin screw has a risk of lowering the holding force due to deterioration, and is not reliable. Even when resin screws are employed, there remains a problem that it is difficult to secure an insulation distance between the cross section of the screw hole and the heat radiating member.

  The main object of the present invention is to provide a lighting fixture that secures an insulation distance between a light source substrate and a screw, a light source substrate and a heat dissipation member, and has improved adhesion between the light source substrate and the heat dissipation member.

The lighting fixture according to the present invention is:
A light source substrate having a mounting surface on which a light source is mounted and a non-mounting surface which is a back surface of the mounting surface, and a light source substrate provided with a through hole;
A substrate mounting surface to which the light source substrate is mounted, a substrate mounting surface to which heat generated by the light source is transferred from a non-mounting surface of the light source substrate, and a recess provided in the substrate mounting surface, the light source substrate A recess provided at a position corresponding to the through-hole of the above, and a screw portion provided at the bottom of the recess, and a heat dissipating part that dissipates heat transferred to the substrate mounting surface,
A fixing screw having a screw head and a screw shaft portion having a male screw portion;
A plate-shaped contact component formed of an insulating material and having a front surface and a back surface, the screw contact portion penetrating the screw shaft portion and locking the screw head, the screw hole and the light source substrate An abutting part arranged so that the through-hole communicates with the mounting surface around the through-hole of the light source substrate,
The fixing screw is
The screw shaft portion passes through the screw hole of the contact component and the through hole of the light source substrate, and the male screw portion is screwed with the female screw portion, so that the contact component is mounted on the light source substrate. The light source substrate is fixed to the substrate mounting surface by pressing against a surface.

  According to the lighting apparatus of the present invention, the screw shaft portion of the fixing screw passes through the screw hole of the contact part and the through hole of the light source substrate, and the screw portion of the fixing screw is screwed with the female screw portion of the recess. By pressing the abutting component against the mounting surface of the light source board and fixing the light source board to the board mounting surface, an insulation distance between the fixing screw and the light source board, an insulation distance between the heat radiation part and the light source board can be secured, The adhesion between the light source substrate and the heat radiating part can be enhanced.

1 is a perspective view of a lighting fixture 100 according to Embodiment 1. FIG. 1 is an exploded perspective view of a lighting fixture 100 according to Embodiment 1. FIG. FIG. 3 is a diagram showing an attachment structure for attaching an insulating sheet 120 to a substrate attachment surface 111 in the lighting apparatus 100 according to Embodiment 1. FIG. 3 is a diagram showing an attachment structure for attaching an LED substrate 130 to a substrate attachment surface 111 in the lighting fixture 100 according to Embodiment 1. FIG. 5 is a diagram showing a state where an insulating sheet 120 and an LED substrate 130 are attached to a substrate attachment surface 111 in the lighting fixture 100 according to Embodiment 1. 3 is a perspective view of a bush 132 and a board mounting screw 131 in the lighting fixture 100 according to Embodiment 1. FIG. It is a figure which shows the bush 132 in the lighting fixture 100 which concerns on Embodiment 1, (a) is the figure which looked at the bush 132 from Q1 direction (refer FIG. 6), (b) is the bush 132 direction Q2 (refer FIG. 6). ). It is the elements on larger scale of the AA cross section of FIG. (A) The figure which looked at the recessed part 112 formed in the board | substrate attachment surface 111 from the light irradiation direction side, (b) The figure which looked at the board | substrate through-hole 133 provided in the LED board 130 from the light irradiation direction side. It is. It is a figure which shows the variation (a) (b) of the shape of the contact part 132a of the bush 132. FIG. It is a figure which shows the attachment structure of the holding frame 150 which hold | suppresses the peripheral part of LED board 130. FIG. It is the figure which looked at the lighting fixture 100 which concerns on Embodiment 1 from the irradiation direction of light. It is a figure which shows the attachment structure of the cover 160 which covers LED140.

Embodiment 1 FIG.
FIG. 1 is a perspective view of a lighting fixture 100 according to the present embodiment. FIG. 2 is an exploded perspective view of the lighting fixture 100 according to the present embodiment. The whole structure of the lighting fixture 100 which concerns on this Embodiment is demonstrated using FIG.1 and FIG.2.

  A lighting fixture 100 shown in FIG. 1 is, for example, a ceiling-embedded lighting fixture (downlight) used in a state of being embedded in a mounting surface such as a ceiling.

  As shown in FIG. 2, the luminaire 100 includes a heat dissipating unit 110, an insulating sheet 120, an LED substrate 130, a holding frame 150, a cover 160, and a reflecting unit 170.

  The heat dissipation part 110 includes a board attachment surface 111 to which the LED board 130 is attached. The heat dissipating unit 110 is a heat sink that dissipates heat generated from the LEDs 140 mounted on the LED substrate 130 attached to the substrate attachment surface 111. On the back side of the board mounting surface 111, heat radiating fins 119 for efficiently radiating heat generated from the LEDs 140 are provided. The heat radiating part 110 is formed of a metal that transfers heat, for example, aluminum.

  The insulating sheet 120 is disposed between the LED board 130 and the board mounting surface 111. The insulating sheet 120 electrically insulates between the metal part exposed from the peripheral cross section of the LED substrate 130 and the substrate mounting surface 111. The insulating sheet 120 is formed larger than the LED substrate 130 in order to secure an insulating distance between the metal portion exposed from the cross section of the peripheral edge of the LED substrate 130 and the substrate mounting surface 111.

  The LED substrate 130 has a mounting surface 134 on which the LED 140 that is a light source is mounted, and a non-mounting surface 135 (see FIG. 8) that is the back surface of the mounting surface 134. The LED substrate 130 is, for example, an aluminum substrate.

  The board mounting screw 131 (fixing screw) is a screw for fixing a predetermined portion of the LED board 130 to the board mounting surface 111. The board mounting screw 131 is a highly reliable metal screw with little deterioration over time. The bush 132 is formed of an insulating material, and is a member that covers a part of the board mounting screw 131 and secures insulation (insulation distance) of the board mounting screw 131.

  The LED substrate 130 has a substrate through-hole 133 in the center portion through which the bush 132 and the screw shaft portion 131b (screw rod) of the substrate mounting screw 131 are passed. In the present embodiment, a case where the central portion of the LED substrate 130 is fixed to the substrate mounting surface 111 will be described. However, portions other than the central portion of the LED substrate 130 may be fixed to the substrate mounting surface 111. The present embodiment can be applied regardless of the position on the LED substrate 130 that is fixed to the substrate mounting surface 111.

  Moreover, you may fix to the board | substrate attachment surface 111 in several places on the LED board 130. FIG. Since one bush and one board mounting screw are required for one fixing point, a plurality of bushes 132 and a plurality of board mounting screws 131 are required to fix at a plurality of points.

  The LED board 130 mounts the LED 140 (light source) on the mounting surface 134. The non-mounting surface 135 of the LED substrate 130 is attached so as to come into surface contact with the substrate attachment surface 111. In the present embodiment, the non-mounting surface 135 comes into contact (surface contact) with the substrate mounting surface 111 of the heat radiating portion 110 via the insulating sheet 120.

  As described above, the insulating sheet 120 is used to secure an insulating distance between the metal portion exposed from the cross section of the peripheral edge of the LED substrate 130 and the substrate mounting surface 111. However, for example, the insulating sheet 120 may be omitted by performing processing such as coating so that the metal portion is not exposed from the cross section of the peripheral edge of the LED substrate 130. In the following description, “the non-mounting surface 135 and the board mounting surface 111 are in surface contact”, “the non-mounting surface 135 and the board mounting surface 111 are in contact”, “the non-mounting surface 135 and the board mounting surface 111 are In the case of “contacting” or the like, the insulating sheet 120 may be disposed between the non-mounting surface 135 and the board mounting surface 111. It is assumed that the non-mounting surface 135 and the board mounting surface 111 are insulated by the insulating sheet 120 or a coating process.

  The non-mounting surface 135 of the LED substrate 130 and the substrate mounting surface 111 of the heat dissipating part 110 are in surface contact and thermally connected. The board mounting surface 111 receives heat generated from the LEDs 140 mounted on the LED board 130. The heat received by the board mounting surface 111 is radiated from the radiating fins 119 of the radiating unit 110. At this time, it is preferable that the board mounting surface 111 and the non-mounting surface 135 of the LED board 130 are as close as possible so that the board mounting surface 111 can efficiently receive the heat generated from the LEDs 140. When the non-mounting surface 135 and the substrate mounting surface 111 are attached via the insulating sheet 120, the non-mounting surface 135 and the insulating sheet 120 are brought into close contact with each other, and the insulating sheet 120 and the substrate mounting surface and 111 are brought into close contact with each other. It is preferable to improve the conduction efficiency of heat conduction from the non-mounting surface 135 to the substrate mounting surface 111.

  The holding frame 150 is a ring-shaped (annular) frame having an opening in which the LED 140 of the LED substrate 130 is disposed. The holding frame 150 is fixed to the board mounting surface 111 while pressing the vicinity of the periphery of the mounting surface 134 of the LED board 130 toward the board mounting surface 111. As a result, the vicinity of the periphery of the LED substrate 130 is fixed to the substrate mounting surface 111. The holding frame 150 is disposed around the LED 140 so that the LED 140 is positioned in the opening.

  The cover 160 is fixed to the board mounting surface 111 so as to cover the LED 140 located at the opening of the holding frame 150.

  The reflection unit 170 includes a reflection plate 175 formed so as to spread in the light irradiation direction, an opening (bottom opening 174) formed on the opposite side of the light irradiation direction, and an end of the reflection plate 175 on the light irradiation direction side. And a decorative frame 176 provided in the section. Moreover, the reflection part 170 is provided with the heat radiating part fixing | fixed part 173 which fixes the heat radiating part 110, and the leaf | plate spring 171 and the stopper 172 for fixing the lighting fixture 100 to the attachment hole provided in the ceiling surface etc.

  Next, an attachment structure for attaching the LED substrate 130 to the substrate attachment surface 111 of the heat radiating portion 110 will be described with reference to FIGS.

  FIG. 3 is a diagram showing a mounting structure for mounting the insulating sheet 120 to the board mounting surface 111 in the lighting fixture 100 according to the present embodiment. FIG. 4 is a diagram showing an attachment structure for attaching the LED substrate 130 to the substrate attachment surface 111 in the luminaire 100 according to the present embodiment. FIG. 5 is a diagram showing a state where the insulating sheet 120 and the LED board 130 are attached to the board attachment surface 111 in the lighting fixture 100 according to the present embodiment.

  As shown in FIG. 3, a sheet screw hole 122 for allowing the bush 132 (see FIG. 2) and the board mounting screw 131 (see FIG. 2) to pass through is formed in the central portion of the insulating sheet 120. In the vicinity of the periphery of the insulating sheet 120, a sheet positioning hole 121 used for positioning when the insulating sheet 120 is attached to the substrate mounting surface is provided.

  The board mounting surface 111 includes a recess 112 at a position corresponding to the sheet screw hole 122 of the insulating sheet 120. Further, the board mounting surface 111 includes a sheet positioning protrusion 113 inserted into the sheet positioning hole 121 at a position corresponding to the sheet positioning hole 121 of the insulating sheet 120.

  As shown in FIG. 4, the insulating sheet 120 is positioned on the substrate mounting surface 111 by inserting the sheet positioning protrusion 113 of the substrate mounting surface 111 into the sheet positioning hole 121. Then, the LED substrate 130 is disposed on the upper surface (front surface) of the positioned insulating sheet 120.

  A plurality of LEDs 140 are arranged on the mounting surface 134 of the LED substrate 130 so as to form a substantially square shape (see FIG. 12). A connector 136 for connecting to a power supply device or the like is disposed on the mounting surface 134 of the LED substrate 130.

  A substrate through hole 133 for allowing the bush 132 and the substrate mounting screw 131 to pass therethrough is formed at the center of the LED substrate 130. The LED board 130 is fixed to the board mounting surface 111 by board mounting screws 131 inserted into the bush 132.

  As shown in FIG. 5, the shapes of the insulating sheet 120 and the LED substrate 130 are generally similar. As described above, the metal portion is exposed at the cross section 139 at the periphery of the LED substrate 130, and it is necessary to ensure an insulation distance between the cross section 139 at the periphery of the LED substrate 130 and the substrate mounting surface 111. Therefore, as shown in FIG. 5, the insulating sheet 120 is formed so as to protrude beyond a predetermined length from the peripheral edge of the LED substrate 130. The predetermined length is the shortest length that can secure an insulation distance between the peripheral edge of the LED substrate 130 and the substrate mounting surface 111, and is a length defined by an assumed operating voltage, necessary insulation strength, and the like.

  As shown in FIG. 5, there is a portion (sheet protruding portion 123) where the insulating sheet 120 protrudes over a predetermined length around the entire periphery of the LED substrate 130. The presence of the sheet protruding portion 123 ensures an insulation distance between the cross section 139 of the peripheral edge of the LED substrate 130 and the substrate mounting surface 111 (heat radiation portion 110).

  FIG. 6 is a perspective view of the bush 132 and the board mounting screw 131 in the lighting fixture 100 according to the present embodiment. 7A is a plan view of the bush 132 viewed from the Q1 direction (see FIG. 6), and FIG. 7B is a bottom view of the bush 132 viewed from the Q2 direction (see FIG. 6). FIG. 8 is a partially enlarged view of the AA cross section of FIG. 9A is a view of the concave portion 112 formed on the substrate mounting surface 111 as viewed from the light irradiation direction side, and FIG. 9B is a light irradiation direction side of the substrate through-hole 133 provided in the LED substrate 130. It is the figure seen from.

  First, the configuration of the bush 132 and the board mounting screw 131 will be described with reference to FIGS. 6 and 7.

  As shown in FIG. 6, the bush 132 includes a disk-shaped contact portion 132a (contact component) having a protruding portion 132c, and a columnar (cylindrical) spacer portion 132b (spacer) in which holes are formed. Is provided. The board mounting screw 131 includes a screw head 131a, a screw shaft portion 131b, and a male screw portion 131c. The male screw portion 131c is formed at the tip of the screw shaft portion 131b, but may be formed on the entire outer surface of the screw shaft portion 131b.

  The contact portion 132a (contact component) is formed of an insulating material and has a disk shape having a contact portion surface 132i (front surface) and a contact portion back surface 132f (back surface). The contact portion 132a has a disk through hole 132j (screw hole) that allows the screw shaft portion 131b to pass therethrough and locks the screw head portion 131a. The diameter of the disc through hole 132j is smaller than the outer diameter of the screw head 131a and larger than the outer diameter of the screw shaft portion 131b.

  The spacer part 132b (spacer) is cylindrical and is formed of an insulating material. The spacer part 132b (spacer) has an insertion hole 132k for inserting the screw shaft part 131b and penetrating the screw shaft part 131b. The diameter of the insertion hole 132k is substantially the same as the diameter of the disc through hole 132j.

  The spacer part 132 b covers the outer peripheral surface of the screw shaft part 131 b of the board mounting screw 131 and secures an insulation distance of the screw shaft part 131 b of the board mounting screw 131. The edge of the substrate through-hole 133 of the LED substrate 130 has a cross-section, and a metal (for example, aluminum) is exposed. An edge cross section of the substrate through hole 133 is a hole cross section 133a (see FIG. 8). The spacer portion 132b covers the outer peripheral surface of the screw shaft portion 131b that passes through the substrate through hole 133, and the edge cross section (hole cross section 133a) of the screw shaft portion 131b of the substrate mounting screw 131 and the substrate through hole 133 of the LED substrate 130. Ensure insulation with.

  One end of the spacer portion 132b is connected to the contact portion back surface 132f so that the disc through-hole 132j and the insertion hole 132k communicate with each other. The end surface of the other end portion (end portion 132d) of the spacer portion 132b has a hole communicating with the insertion hole 132k. The contact part 132a and the spacer part 132b may be separate parts or may be integrally formed. By being integrally formed, the number of parts can be reduced, and the operator can easily handle and workability is improved.

  In the present embodiment, it is assumed that the bush 132 is integrally formed with the contact portion 132a and the spacer portion 132b. A hole formed by communicating the disc through hole 132j of the contact portion 132a and the insertion hole 132k of the spacer portion 132b is referred to as a bush screw insertion hole 132e.

  As shown in FIGS. 6 and 7A, the contact portion 132a includes a protruding portion 132c formed by protruding the contact portion surface 132i around the bush screw insertion hole 132e in an annular shape. In the present embodiment, the protrusion 132c is formed in the vicinity of the periphery of the contact surface 132i, but may be formed inside the periphery. For example, the protrusion 132c 'may be provided at a position indicated by a two-dot chain line in FIG.

  Moreover, as shown in FIG.7 (b), as for the spacer part 132b, a part of outer peripheral surface is cut vertically. The cross section of the spacer portion 132b is not circular, but has a shape in which arc portions 132l 'and 132m' facing each other on the circumference are notched. The notched portions of the outer peripheral surface of the spacer portion 132b are referred to as notched portions 132l and 132m. The notch portion 132l and the notch portion 132m are provided symmetrically with respect to the center line l.

  Next, the details of the mounting structure of the LED substrate 130 will be described with reference to FIG.

  As described above, the LED substrate 130 has the mounting surface 134 on which the LEDs 140 are mounted and the non-mounting surface 135 that is the back surface of the mounting surface 134, and has the substrate through-hole 133 in the substantially central portion.

  As shown in FIG. 8, the insulating sheet 120 is placed on the board attachment surface 111 of the heat radiating section 110, and the LED board 130 is placed thereon. The substrate mounting surface 111 is in surface contact with the non-mounting surface 135 of the LED substrate 130 via the insulating sheet 120. As described above, the insulating sheet 120 can be omitted.

  Heat generated by the LED 140 is transferred to the board mounting surface 111. The heat transferred to the board mounting surface 111 is radiated from the above-described radiating fin 119 (see FIG. 5). In order to efficiently dissipate the heat generated in the LED 140, it is necessary to improve the adhesion between the LED substrate 130 and the substrate mounting surface 111 and to efficiently transfer heat from the LED substrate 130 to the heat dissipating unit 110.

  As shown in FIG. 8, the recess 112 is provided at a position corresponding to the substrate through hole 133 of the LED substrate 130. The recess 112 is formed in a substantially hemispherical shape from a circular recess opening 112 c formed on the substrate mounting surface 111. The inner surface of the recess 112 (the recess inner surface 112d) has a substantially hemispherical shape (a bowl shape). The recess opening 112c is larger than the substrate through-hole 133 and smaller than the contact portion 132a.

  A bush positioning portion 112b, which is a recess into which the end portion 132d of the spacer portion 132b of the bush 132 is fitted, is formed at the bottom of the recess 112. In addition, a female screw portion 112a is provided on the bottom surface of the bush positioning portion 112b. The female screw portion 112a is screwed with the male screw portion 131c exposed from the end portion 132d of the spacer portion 132b. The female thread portion 112a is formed by providing threading on the inner surface of a cylindrical recess formed at the substantially central portion of the bottom surface of the bush positioning portion 112b.

  The LED substrate 130 is placed on the surface (upper surface) of the insulating sheet 120 so that the substrate through hole 133 corresponds to the recess opening 112c. The bush 132 is fitted into a bush positioning portion 112 b formed at the bottom of the recess 112, with the end portion 132 d of the spacer portion 132 b passing through the substrate through hole 133 and the sheet screw hole 122 of the insulating sheet 120.

  Here, the positioning structure of the bush 132 and the positioning structure of the LED substrate 130 will be described.

  FIG. 9A is a view of the recess 112 as seen from the light irradiation direction side. A circular recess opening 112c is formed in the substrate mounting surface 111, and the recess inner surface 112d is recessed from the recess opening 112c toward the bottom so as to form a hemispherical shape.

  The recessed portion 112 includes a bush positioning portion 112b that is recessed in a shape substantially the same as the cross-sectional shape of the spacer portion 132b of the bush 132 at the bottom. The bush positioning portion 112b is a recess having substantially the same shape as the cross-sectional shape of the spacer portion 132b, but is slightly larger than the cross-sectional shape of the spacer portion 132b to such an extent that the end portion 132d of the spacer portion 132b can be fitted.

  As shown in FIG. 7B, the cross-sectional shape of the spacer portion 132b is a shape including notches 132l and 132m in which a part of the circle is cut. Therefore, when the spacer portion 132b is fitted into the bush positioning portion 112b having the same shape, the bush The tip of 132 (the end 132d of the spacer portion 132b) is fixed without rotating inside the bush positioning portion 112b. Thereby, the bush 132 is positioned without rotating.

  The cross-sectional shape of the spacer portion 132b may be other shapes as long as it does not rotate. For example, it may have a key groove, an ellipse, an ellipse, or other shapes. The cross-sectional shape of the spacer portion 132b is such that it does not rotate within the bush positioning portion 112b, so that the direction in which the bush 132 is attached is determined (the direction of attachment of the bush occurs), the assembly is improved, and the erroneous attachment Can be prevented.

  FIG. 9B is a view of the substrate through hole 133 provided in the LED substrate 130 as viewed from the light irradiation direction side. The shape of the substrate through hole 133 is substantially the same as the cross-sectional shape of the spacer portion 132b. The substrate through-hole 133 is substantially the same as the cross-sectional shape of the spacer portion 132b, but is formed slightly larger than the cross-sectional shape of the spacer portion 132b to the extent that the spacer portion 132b can be penetrated.

  As shown in FIG. 4, when the operator places the LED board 130 on the board mounting surface 111, the insulation is performed with reference to the position of the sheet screw hole 122 of the positioned insulating sheet 120 and the position of the connector 136. The LED substrate 130 is placed on the sheet 120. Then, the operator passes the spacer portion 132b of the bush 132 through the substrate through hole 133 of the LED substrate 130, and fits the end portion 132d of the bush 132 into the bush positioning portion 112b.

  In order to fit the end portion 132d of the bush 132 into the bush positioning portion 112b, an operator must perform an operation of applying a pressing force for pushing the bush 132. By performing this operation, the operator cannot visually check whether the end 132d of the bush 132 is fitted into the bush positioning portion 112b. However, the end 132d of the bush 132 is It can be known whether or not it is fitted in the positioning portion 112b.

  As shown in FIG. 9B, the shape of the substrate through hole 133 is substantially the same as the cross-sectional shape of the spacer portion 132b. Since the spacer part 132b penetrating the substrate through-hole 133 cannot be rotated in the substrate through-hole 133, if the spacer part 132b is fixed, the LED substrate 130 through which the spacer part 132b passes is also fixed. .

  As described above, the end portion 132d of the bush 132 is fitted into the bush positioning portion 112b and positioned, whereby the LED substrate 130 is also positioned.

  Returning to FIG. 8, the description of the mounting structure of the LED substrate 130 will be continued. When the bush 132 passes through the board through-hole 133 and the sheet screw hole 122 of the insulating sheet 120, the end 132 d of the spacer portion 132 b is fitted into the bush positioning portion 112 b which is a recess formed at the bottom of the recess 112. The contact portion back surface 132 f contacts the surface around the substrate through-hole 133 of the mounting surface 134 of the LED substrate 130.

  Thereafter, the board mounting screw 131 is inserted into the bush screw insertion hole 132e. In the board mounting screw 131, the male screw part 131c passes through the bush screw insertion hole 132e and is screwed with the female screw part 112a, so that the contact part back surface 132f is around the board through hole 133 of the mounting surface 134 of the LED board 130. The LED substrate 130 is fixed to the substrate mounting surface 111 while pressing the surface.

  As shown in FIG. 8, when the screw shaft portion 131b of the board mounting screw 131 passes through the bush screw insertion hole 132e, the maximum exposed length of the male screw portion 131c at the tip of the screw shaft portion 131b is the length of L5. And In order for the screw head 131a to press the contact portion 132a of the bush 132 against the light source board side by screwing the male screw portion 131c and the female screw portion 112a, the depth L6 of the female screw portion 112a is It is necessary to form deeper than the maximum exposure length L5 of the part 131c.

  Further, if the screw head 131a presses the contact portion 132a of the bush 132 too much, the vicinity of the substrate through hole 133 of the LED substrate 130 may be deformed. When the LED substrate 130 is deformed, the adhesion between the LED substrate 130 around the deformed portion and the substrate mounting surface 111 is lowered.

  Therefore, the height L7 of the spacer portion 132b is adjusted so that the screw head portion 131a does not press the contact portion 132a of the bush 132 too much. The height L7 of the spacer portion 132b is preferably substantially the same as the length L8 from the mounting surface 134 of the LED substrate 130 to the bottom surface of the bush positioning portion 112b. Here, if the height L7 of the spacer portion 132b and L8 from the mounting surface 134 to the bottom surface of the bush positioning portion 112b are substantially the same length, the spacer portion 132b becomes a refill rod, and the board mounting screw 131 is attached. It may be impossible to push in. However, since the bush 132 is made of a resin such as nylon or polycarbonate, for example, the bush 132 has elasticity, so that the board mounting screw 131 can be pushed in a little while preventing excessive push-in.

  The height L7 of the spacer portion 132b may be slightly shorter than the length L8 from the mounting surface 134 to the bottom surface of the bush positioning portion 112b. In this case, as shown in FIG. 8, when the board mounting screw 131 is not tightened, a minute gap 190 is generated on the bottom surface of the bush positioning portion 112b. By tightening the board mounting screw 131 to such an extent that the gap 190 is filled, the adhesion between the LED board 130 and the board mounting surface 111 can be improved without pressing the contact portion 132a with the board mounting screw 131 more than necessary. it can.

  Next, a structure for securing an insulation distance between the screw head 131a and the mounting surface 134 of the LED substrate 130 using the abutting portion 132a of the bush 132 will be described. In addition, since the number of LEDs 140 increases with the increase in the output of the instrument and the arrangement density of the conductor pattern on the mounting surface 134 is high, the insulation distance between the screw head 131a and the mounting surface 134 is ensured.

  In order to ensure the insulation distance between the screw head 131a and the mounting surface 134, the spatial distance between the screw head 131a and the mounting surface 134 is set to be equal to or greater than the shortest distance that can ensure insulation (insulation distance). There is a need. Here, the spatial distance for securing the insulation distance between two points includes the creepage distance.

  As shown in FIG. 8, it is assumed that the point P1 of the screw head 131a and the point P4 of the mounting surface 134 are the shortest points connecting the screw head 131a and the mounting surface 134. Here, the spatial distance for securing the insulation distance between the point P1 of the screw head 131a and the point P4 of the mounting surface 134 includes a creepage distance. The spatial distance (including creepage distance) between the point P1 of the screw head 131a and the point P4 of the mounting surface 134 is (distance between P1 and P2) + (distance between P2 and P3 (creepage distance)) + (Distance between P3 and P4 (creeping distance)) = L2 (Space distance between P1 and P4 (including creepage distance)). Various standard values are defined for the shortest spatial distance (including creepage distance) (predetermined distance) that can ensure insulation (insulation distance) depending on an assumed operating voltage, necessary insulation strength, and the like.

  As shown in FIG. 8, the abutting portion 132a of the bush 132 according to the present embodiment is provided with the protruding portion 132c, so that (P1- The spatial distance corresponding to (distance between P2)-(distance of L4) can be increased.

  Moreover, since the contact part 132a of the bush 132 which concerns on this Embodiment is provided with the protrusion part 132c, the spatial distance (distance of L3) compared with the case of the flat contact part without the protrusion part 132c ( Creepage distance) can be increased.

  Although the spatial distance can be increased by increasing the area of the contact portion 132a, the area where the LED 140 cannot be mounted increases on the mounting surface 134 when the area of the contact portion 132a is increased. There is a risk that the arrangement of the light will be biased and unevenness in the light distribution will occur. According to the bush 132 according to the present embodiment, the area of the contact portion 132a can be reduced and the spatial distance can be increased, so that the influence on the arrangement of the LEDs 140 is small.

  FIG. 10 is a view showing variations (a) and (b) of the shape of the bush 132.

  FIG. 10A shows that the contact part surface 132i of the contact part 132a gradually increases from the center toward the periphery (the thickness of the contact part 132a gradually increases). Is formed. By forming in this way, the spatial distance between P1 and P5 can be made longer than in the case of a flat contact portion having a constant thickness. In addition, since no protrusions are formed, manufacturing is easy.

  In FIG. 10B, the bush screw insertion hole 132e portion of the contact portion surface 132i of the contact portion 132a is high and gradually decreases from the center toward the periphery (the thickness of the contact portion gradually decreases). It is formed in a mountain shape and a cone shape. By forming in this way, the spatial distance between P1 and P5 can be made longer than in the case of a flat contact portion having a constant thickness. Further, as shown in FIG. 10B, since the contact portion surface 132i reflects the light from the LED 140, it also functions as a reflector, contributing to improvement in light emission efficiency and reduction in unevenness of light distribution.

  Further, as shown in FIG. 7A, two protrusions of a protrusion 132c and a protrusion 132c 'may be formed on the contact surface 132i. As a result, the spatial distance (including creepage distance) can be increased without increasing the area of the contact portion 132a.

  Next, securing the insulation distance between the hole cross section 133a (see FIG. 8), which is the edge forming the substrate through-hole 133, and the heat radiating section 110 will be described. The distance connecting the point P6 of the hole cross section 133a forming the substrate through-hole 133 of the LED substrate 130 and the point P7 of the concave inner surface 112d is the shortest spatial distance between the hole cross section 133a and the concave inner surface 112d.

  The spatial distance L1 between the point P6 of the hole cross section 133a and the point P7 of the inner surface 112d of the recess needs to be equal to or longer than the shortest distance that can secure the insulation distance between the hole cross section 133a and the inner surface 112d of the recess. The shortest distance at which the spatial distance L1 can secure the insulation distance is defined as a different standard value depending on the output of the instrument.

  The recess 112 is formed such that the spatial distance L1 between the point P6 of the hole cross section 133a and the point P7 of the recess inner surface 112d is equal to or greater than the shortest distance that can ensure insulation between the hole cross section 133a and the recess inner surface 112d. The

  In the present embodiment, the shape of the recess 112 is hemispherical, but it is possible to ensure that the shortest spatial distance between the hole cross section 133a and the recess inner surface 112d is equal to or greater than the shortest distance that can ensure insulation. Any other shape may be used as long as it is a simple shape. For example, a rectangular parallelepiped shape, a cubic shape, a pyramid shape, a conical shape, or the like may be used.

  The size of the recess opening 112c is preferably smaller than the size of the contact portion 132a. However, depending on the output amount of the instrument, a large recess 112 is provided to ensure a long spatial distance L1 between the hole cross section 133a and the recess inner surface 112d. You may have to. Then, the recess opening 112c may be larger than the contact portion 132a. Even in such a case, the spacer portion 132b can prevent the substrate mounting screw 131 from being excessively pushed, so that the concave portion 112 having a sufficient spatial distance can be formed.

  FIG. 11 is a view showing a mounting structure of a holding frame 150 that holds the periphery of the LED substrate 130. FIG. 12 is a view of the luminaire 100 according to the present embodiment as seen from the light irradiation direction. FIG. 13 is a view showing a mounting structure of a cover 160 that covers the LED 140.

  As shown in FIG. 11, the pressing frame 150 includes a frame opening 154, a substrate pressing portion 155, and a screw insertion hole 152. The holding frame 150 is attached to the board attachment surface 111 after the LED board 130 is attached to the board attachment surface 111 by the bush 132 and the board attachment screw 131, and the necessary lead wires 137 and the like are connected to the connector 136 of the LED board 130. It is done. The holding frame 150 is a member for pressing and fixing the periphery of the LED 140 mounted on the LED substrate 130.

  The peripheral portion of the LED substrate 130 is pressed against the substrate mounting surface 111 by the holding frame 150, and the central portion of the LED substrate 130 is pressed against the substrate mounting surface 111 by the bush 132 and the substrate mounting screw 131 described above. And the substrate mounting surface 111 are improved in adhesion.

  The holding frame 150 is attached to the board attachment surface 111 with a frame attachment screw 151. The holding frame 150 includes a screw insertion hole 152 that is a through hole that allows the shaft portion of the frame mounting screw 151 to pass therethrough and locks the head of the frame mounting screw 151.

  The board mounting surface 111 includes a frame mounting hole 114 that is screwed with the shaft portion of the frame mounting screw 151 at a position corresponding to the screw insertion hole 152 of the presser frame 150. In the present embodiment, the holding frame 150 is attached by four frame attachment screws 151. Four frame mounting holes 114 corresponding to each of the four frame mounting screws 151 are provided in the substrate mounting surface 111 near the periphery of the insulating sheet 120.

  The board pressing portion 155 is a member that protrudes from the periphery of the frame opening 154 to the center and presses the vicinity of the LED 140 of the LED board 130 toward the board mounting surface 111 side.

  As shown in FIG. 11, the LEDs 140 mounted on the LED substrate 130 are arranged so as to form a substantially square shape.

  FIG. 12 is a view of the luminaire 100 according to the present embodiment as viewed from the light irradiation direction, but the cover 160 is omitted for the sake of explanation. As shown in FIG. 12, the substrate pressing portion 155 protrudes from the circumference of the frame opening 154 to the center, and the shape of the frame opening 154 is substantially square. The holding frame 150 can hold the periphery of the LED 140 arranged in a substantially square shape with the periphery of the substantially square frame opening 154. Thereby, the area | region where LED140 of LED board 130 is arrange | positioned can be stuck to the thermal radiation part 110 more reliably.

  FIG. 13 is a view showing a mounting structure of a cover 160 that covers the LED 140. As shown in FIG. 13, the cover 160 is attached so as to cover the LED 140 disposed behind the frame opening 154 of the presser frame 150. The cover 160 is attached to the board attachment surface 111 by a cover attachment screw 161 and a cover attachment washer 162. The cover 160 includes a screw insertion hole 163 that is a through hole that allows the shaft portion of the cover mounting screw 161 to pass therethrough and locks the head of the cover mounting screw 161.

  As shown in FIG. 11, the board mounting surface 111 includes a screw receiving portion 117 that is screwed with the cover mounting screw 161 at a position corresponding to the screw insertion hole 163 of the cover 160. The holding frame 150 includes a through hole 153 through which the screw receiving portion 117 passes.

  As shown in FIG. 13, a cover 160 is placed on the presser frame 150, the shaft portion of the cover mounting screw 161 is inserted into the cover mounting washer 162 and the screw insertion hole 163, and the screw receiving portion that penetrates the through hole 153 of the presser frame 150. The cover 160 is attached to the board attachment surface 111 by being screwed with 117.

  As described above, according to the lighting fixture 100 according to the present embodiment, even if the output of the fixture is increased and the LED board 130 is enlarged, the LED board 130 is insulated from the metal screw (board mounting screw 131). Various portions of the LED board 130 can be fixed with the board mounting screws 131 while ensuring the distance and the insulation distance between the LED board 130 and the heat radiation part 110. For this reason, the adhesion between the LED substrate 130 and the heat radiating part 110 is improved, the heat radiation efficiency is improved, and the life of the LED 140 can be extended.

  Moreover, according to the lighting fixture 100 which concerns on this Embodiment, the contact part 132a (contact part) has the protrusion part 132c which the contact part surface 132i around the disc through-hole 132j (screw hole) protruded. Thus, the spatial distance (creeping distance) between the screw head 131a and the mounting surface 134 can be increased without increasing the area of the contact portion 132a. Therefore, various portions of the LED board 130 can be fixed by the board mounting screws 131 without affecting the arrangement of the LEDs 140.

  According to the luminaire 100 according to the present embodiment, since the center portion of the LED substrate 130 can be fixed to the heat radiating portion 110 with the bush 132 and the substrate mounting screw 131, the pressing frame 150 can be attached, so that workability is improved. To do. Further, since the central portion of the LED substrate 130 is fixed to the heat radiating portion 110 by the bush 132 and the substrate mounting screw 131 from the mounting surface 134 side of the LED 140, assembly is easy.

  DESCRIPTION OF SYMBOLS 100 Lighting fixture, 110 Heat radiation part, 111 Substrate attachment surface, 112 Concave part, 112a Female thread part, 112b Bush positioning part, 112c Concave opening, 112d Concave inner surface, 113 Sheet positioning protrusion, 114 Frame attachment hole, 117 Screw receiving part, 119 Radiation fin, 120 Insulating sheet, 121 Sheet positioning hole, 122 Sheet screw hole, 123 Sheet protruding part, 130 LED board, 131 Board mounting screw, 131a Screw head, 131b Screw shaft part, 131c Male thread part, 132 Bush, 132a Contact part, 132b Spacer part, 132c Projection part, 132d End part, 132e Bush screw insertion hole, 132f Contact part back surface, 132h Connection part, 132i Contact part surface, 132j Disc through hole, 132k insertion hole, 132l, 132m out Notch, 133 Substrate through hole, 133a Hole cross section, 134 Mounting surface, 135 Non-mounting surface, 136 Connector, 137 Lead wire, 140 LED, 150 Holding frame, 151 Frame mounting screw, 152 Screw insertion hole, 153 Through hole, 154 Frame opening, 155 Substrate pressing part, 160 cover, 161 cover mounting screw, 162 cover mounting washer, 163 screw insertion hole, 170 reflection part, 171 leaf spring, 172 stopper, 173 heat radiation part fixing part, 174 bottom part opening, 175 reflection Board, 176 decorative frame, 190 gap.

Claims (8)

A light source substrate having a mounting surface on which a light source is mounted and a non-mounting surface which is a back surface of the mounting surface, and a light source substrate provided with a through hole;
A substrate mounting surface to which the light source substrate is mounted, a substrate mounting surface to which heat generated by the light source is transferred from a non-mounting surface of the light source substrate, and a recess provided in the substrate mounting surface, the light source substrate A recess provided at a position corresponding to the through-hole of the above, and a screw portion provided at the bottom of the recess, and a heat dissipating part that dissipates heat transferred to the substrate mounting surface,
A fixing screw having a screw head and a screw shaft portion having a male screw portion;
A plate-shaped contact component formed of an insulating material and having a front surface and a back surface, the screw contact portion penetrating the screw shaft portion and locking the screw head, the screw hole and the light source substrate An abutting part arranged so that the through-hole communicates with the mounting surface around the through-hole of the light source substrate,
The fixing screw is
The screw shaft portion passes through the screw hole of the contact component and the through hole of the light source substrate, and the male screw portion is screwed with the female screw portion, so that the contact component is mounted on the light source substrate. A lighting apparatus, wherein the light source substrate is fixed to the substrate mounting surface by being pressed against a surface. The contact part is
The lighting fixture according to claim 1, further comprising a protruding portion protruding from the surface around the screw hole. The lighting apparatus further includes:
A cylindrical spacer formed of an insulating material and having an insertion hole for inserting the screw shaft portion penetrating the screw hole of the contact part into the inside, wherein the screw hole of the contact part and the insertion hole are One end is provided with a spacer that is connected to the back surface of the abutting component through the through-hole of the light source substrate so as to communicate with each other.
The male screw part is
3. The lighting apparatus according to claim 1, wherein the lighting fixture passes through a screw hole of the abutting part and an insertion hole of the spacer and is screwed into the female screw portion. The spacer is
Provided with a cutout part in which a part of the outer peripheral surface of the other end is cut out,
The recess is
The lighting device according to claim 3, further comprising: a positioning portion that inserts the other end portion of the spacer and engages the notch portion to position the spacer at a bottom portion.   The lighting device according to claim 3 or 4, wherein the contact part and the spacer are integrally formed.   The lighting fixture according to claim 1, wherein the fixing screw is a metal.   The spatial distance between the screw head and the mounting surface of the light source board is equal to or greater than the shortest distance that can ensure insulation between the screw head and the mounting surface of the light source board. The lighting fixture in any one of 1-6.   The spatial distance between the cross section forming the through hole of the light source substrate and the inner surface of the recess is equal to or longer than the shortest distance that can ensure insulation between the cross section forming the through hole of the light source substrate and the inner surface of the recess. The lighting apparatus according to claim 1, wherein the lighting apparatus is provided.

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