JP2020077597A - Lighting device - Google Patents

Abstract

To provide a lighting device which achieves good heat radiation performance.SOLUTION: A lighting device 1 includes: a light source 20; a circuit board 51 having a circuit component 52; a case 6 which houses the circuit board 51; and a cover 4 which houses the case 6 therein. The cover 4 has: a cylindrical side wall 42 which encloses an axis 40; and an opening 43 which is formed at one end part as seen in an axis 40 direction of the side wall 42 and through which the case 6 passes. The circuit board 51 is attached to a surface of the case 6, which is along the axis 40, through an insulation sheet 54. The insulation sheet 54 has: an insulation part 541 located between the circuit board 51 and the case 6; and an extension part 542 extending from the insulation part 541. The extension part 542 encloses the circuit board 51 around the axis 40 and opens in the axis 40 direction.SELECTED DRAWING: Figure 3

Description

  The present disclosure relates to a lighting fixture, and more particularly, to a lighting fixture including a circuit board having circuit components, a case, a cover, and an insulating sheet.

  BACKGROUND ART Conventionally, there is known a lighting fixture including a substrate and a main body formed of a housing that houses a power supply terminal block (see, for example, Patent Document 1).

JP, 2016-162506, A

  In this conventional lighting fixture, it is described that a heat dissipation sheet is provided, but the heat dissipation is not good.

  The present disclosure is invented in view of the above conventional problems, and an object of the present disclosure is to provide a lighting fixture having good heat dissipation.

  In order to solve the above problems, a lighting device according to an aspect of the present disclosure includes a light source, a circuit board having circuit components, a case that houses the circuit board, and a cover that houses the case inside. Prepare The cover has a cylindrical side wall that surrounds the axis, and an opening formed at one end of the side wall in the axial direction and through which the case passes. The circuit board is attached to a surface of the case along the axis through an insulating sheet. The insulating sheet has an insulating portion located between the circuit board and the case, and an extending portion extending from the insulating portion. The extending portion surrounds the circuit board around the axis and is open in the axis direction.

  In the lighting device of one aspect according to the present disclosure, heat dissipation becomes good.

FIG. 1 is a perspective view of a lighting fixture according to an embodiment of the present disclosure as viewed from above. FIG. 2 is an exploded perspective view of the above lighting fixture viewed from above. FIG. 3 is a cross-sectional view taken along a plane that passes through the center of the above lighting fixture in a plan view and is orthogonal to the left and right. FIG. 4 is a cross-sectional view taken along a plane that passes through the center of the above lighting fixture in a plan view and is orthogonal to the front and rear. FIG. 5 is an exploded perspective view of the first case body of the same lighting fixture, the second case body to which the device is attached, and the terminal block as viewed from above. FIG. 6 is an exploded perspective view of the case and cover of the same lighting fixture as viewed from above. FIG. 7 is a plan view of the above cover. FIG. 8: is a top view which removed the building mounting member of the lighting fixture same as the above. FIG. 9: is a disassembled perspective view seen from the upper side of the cover and building attachment member same as the above.

  An embodiment of a lighting fixture according to the present disclosure will be described in detail with reference to the drawings. However, each drawing described in the following embodiments is a schematic drawing, and the ratio of the size and thickness of each component does not necessarily reflect the actual dimensional ratio. Note that the configurations described in the following embodiments are merely examples of the present disclosure. The present disclosure is not limited to the following embodiments, and various modifications can be made according to the design and the like as long as the effects of the present disclosure can be exhibited.

  As shown in FIG. 1, a lighting fixture 1 according to an embodiment described below is installed in a building such as a high-rise building or a large commercial facility, and receives power supply from an emergency power supply installed in the building. It is a so-called separate power supply type emergency lighting fixture that performs emergency lighting. The lighting fixture 1 is directly attached to the ceiling material in the building and installed on the ceiling.

  As shown in FIGS. 2 to 4, the lighting device 1 includes a light source 20, a terminal block 3, a terminal block mounting member 11 to which the terminal block 3 is mounted, and a cover 4 for accommodating the terminal block mounting member 11 and the like therein. , Is provided. It should be noted that the up, down, front, back, left, and right directions used in the following description are the directions defined in FIG. 2 unless otherwise specified.

  The light source 20 is included in the light source block 2. The light source block 2 includes a light source 20 including an LED (Light Emitting Diode), a holder 21 that supports the light source 20, a lens 22, a lens holder 23 that supports the lens 22, a mounting plate 24, and a heat dissipation sheet 25. Have The light source 20 is, for example, a package-type white LED for illumination. However, the light source 20 is not limited to the LED, and may be a solid-state light emitting element other than the LED, such as an organic electroluminescence element. A lead 26 is connected to the light source 20, and the lead 26 is held by a lead holder 27.

  The mounting plate 24 is made of a substantially plate-shaped member, and is formed of, for example, a plate material made of aluminum or an aluminum alloy. A holder 21 that supports the light source 20 is attached to the lower surface side of the attachment plate 24. A heat dissipation sheet 25 is provided on the upper surface side of the mounting plate 24. The lower surface of the heat dissipation sheet 25 contacts the upper surface of the holder 21. The heat generated from the light source 20 is radiated through the holder 21 and the heat radiation sheet 25.

  The lens 22 controls the light distribution of the light emitted from the light source 20. The lens 22 is attached to the lower surface of the attachment plate 24 by the lens holder 23 so as to cover the light source 20. The lens holder 23 is attached to the case 6 which will be described later by a fastener 28 made of a screw. With the light source block 2 attached to the case 6, the direction of the light emitted from the light source 20 (the direction of the optical axis) is downward.

  As shown in FIG. 2, the lighting fixture 1 includes a lighting device. The lighting device includes a lighting circuit block 5, a terminal block 3, and the like. The terminal block 3 is, for example, a screwless terminal block. This type of screwless terminal block (also called a quick-connect terminal block) is formed in a rectangular parallelepiped shape and has two pairs of primary side (power source side) insertion holes 31 and two pairs of secondary side (load side). ) And the insertion hole 32 of FIG. That is, the terminal block 3 can complete the electrical connection with the conductors only by inserting the conductors (for example, copper single wires) into the respective insertion holes 31 and 32. Into the insertion holes 32 on the secondary side of the terminal block 3, the conductors of the two electric wires on the secondary side, which are electrically connected to the lighting circuit block 5, are inserted one by one. Into the two pairs of insertion holes 31 on the primary side of the terminal block 3, a conductor of a pair of electric wires to which power is supplied from an emergency power source and a conductor of a pair of electric wires for feeding wiring are respectively inserted. Be done.

  The lighting circuit block 5 includes a circuit board 51 formed of a double-sided printed wiring board, various circuit components 52 mounted on the circuit board 51, a heat dissipation member 53, an insulating sheet 54, and a mounting plate 55. ing. The lighting circuit block 5 includes a rectifier circuit for depolarizing the power supply voltage (AC voltage or DC voltage) supplied from the emergency power supply, a converter circuit for boosting or lowering the input voltage input from the rectifier circuit, and a converter circuit. A control circuit for controlling is provided. The lighting circuit block 5 supplies a current from the converter circuit to the light source 20 to light the light source 20.

  The rear surface of the heat dissipation member 53 contacts the front surface of the circuit board 51, and the rear surface of the insulating sheet 54 contacts the front surface of the heat dissipation member 53. The mounting plate 55 has an L shape in plan view having a front piece 551 and a right piece 552, and the front surface of the insulating sheet 54 contacts the rear surface of the front piece 551 of the mounting plate 55. The insulating sheet 54 has an insulating portion 541 located on the front surface of the mounting plate 55, and an extending portion 542 extending from the insulating portion 541. The extending portion 542 surrounds the circuit board 51 around the vertical axis and is open in the vertical direction. The extending portion 542 is located at a part around the vertical axis of the circuit board 51. The extension portion 542 has a free end at a tip portion extended from the insulating portion 541. The length of the insulating sheet 54 along the vertical direction is the same as the length of the circuit board 51 along the vertical direction. The length of the insulating sheet 54 along the vertical direction may be longer than the length of the circuit board 51 along the vertical direction. In this way, since the extending portion 542 of the insulating sheet 54 surrounds the circuit board 51 around the axis 40 and is open in the direction of the axis 40, the extending portion 542 forms a flow path of the draft flow, and the ascending airflow. Occurs efficiently (chimney effect). This improves the heat dissipation performance of the circuit board 51.

  The extending portion 542 has a free end at a tip portion extending from the insulating portion 541, and includes an insulating sheet regulating portion that regulates the position of the tip portion so as to surround the circuit board 51 around the axis 40. As shown in FIG. 3, the rear piece 61 of the case 6 restricts the extension portion 542 from moving further rearward. That is, the rear piece 61 serves as an insulating sheet restriction portion.

  The lighting device 1 includes a case 6. The case 6 has a first case body 60 and a second case body 65. The first case body 60 includes a rear piece 61, a left side piece 62, a right side piece 63, a rear mounting piece 64, and a terminal block mounting portion 13. In the present embodiment, the first case body 60 constitutes the terminal block mounting member 11. The terminal block mounting member 11 is formed of a bent plate-shaped member, and has a terminal block mounting surface 14 on which the terminal block 3 is mounted. A hole 131 is formed in the terminal block mounting portion 13 so as to extend substantially forward and backward. From the rear side, a fixing tool 132 made of a screw is passed through the hole 131 of the terminal block mounting portion 13, and the fixing tool is screwed into the screw hole formed on the rear surface of the terminal block 3, so that the terminal block 3 is attached to the terminal block mounting section 13. It is attached to the terminal block attachment surface 14 of.

  The second case body 65 includes an upper piece 66, a front piece 67, a lower piece 68, and a pair of left and right front mounting pieces 69. The front attachment piece 69 is formed with a hole 691 that penetrates vertically. The fixture 692,) The lower piece 68 is formed with a lead hole 681 through which the lead holder 27 passes so as to vertically pass therethrough. The light source block 2 is attached to the lower piece 68. In other words, the lower piece 68 serves as a light source block mounting portion. The lighting circuit block 5 is attached to the front piece 67. In other words, the front piece 67 serves as a lighting circuit block mounting portion. The front piece 67 is formed with a screw hole 671 penetrating in the front-rear direction. A hole 511 penetrating in the front-rear direction is formed at a position of the circuit board 51 corresponding to the screw hole 671. A hole 543 is formed in the insulating sheet 54 at a position corresponding to the screw hole 671 so as to penetrate therethrough in the front-rear direction. A hole 553 penetrating in the front-rear direction is formed at a position corresponding to the screw hole 671 of the front piece 67 of the mounting plate 55. From the rear side, a fastener 672 made of a screw is passed through the hole 511 of the circuit board 51, the hole 541 of the insulating sheet 54 and the hole 553 of the mounting plate 55, and the fastener 672 is fitted in the screw hole 671 formed in the front piece 67. Is screwed in. As a result, as shown in FIG. 5, the lighting circuit block 5 is attached to the second case body 65.

  As shown in FIG. 2, the rear mounting piece 64 of the first case body 60 is formed with a vertically penetrating hole through which a fastener 684 made of a screw passes. The lower piece 68 of the second case body 65 is formed with a screw hole 683 into which the fastener 684 is screwed. From the upper side, the fixing tool 684 is passed through the hole of the rear mounting piece 64 of the first case body 60, and the fixing tool 684 is screwed into the screw hole 683 of the lower piece 68 of the second case body 65, so that the first case body 60 Is attached to the second case body 65. Thus, as shown in FIG. 6, the first case body 60 and the second case body 65 form the case 6. As shown in FIGS. 5 and 6, the upper wall 66 of the second case body 65 covers a part of the periphery (above the terminal block 3) of the terminal block 3 mounted on the terminal block mounting part 13. Function as 15. As shown in FIG. 6, the cover wall portion 15 has a terminal block slit 151 for opening a gap of a predetermined length or less from the terminal block 3. A terminal block opening may be provided instead of the terminal block slit 151.

  As shown in FIG. 5, the left side piece 62 of the first case body 60 functions as a covering wall portion that covers the left side around the terminal block 3. Further, the right side piece 63 of the first case body 60 functions as a covering wall portion that covers the right side around the terminal block 3. As a result, the operator is prevented from accidentally touching the terminal block 3.

  As shown in FIGS. 6 and 7, the cover 4 has a circular bottom wall 41 and a cylindrical side wall 42 surrounding the axis 40 (see FIG. 3) extending in the vertical direction. The side wall 42 may have a cylindrical shape, but in the present embodiment, the side wall 42 has a taper whose diameter becomes slightly smaller as it goes downward. An opening 43 through which the terminal block mounting member 11 to which the light source 20 and the terminal block 3 are mounted is formed at one end of the side wall 42 in the direction of the axis 40 (upper end in the present embodiment).

  The cover 4 is formed by aluminum die casting. The cover 4 may be made of metal such as steel other than aluminum. The cover 4 preferably has good thermal conductivity, and is preferably made of metal from this point. The terminal block mounting member 11 is mounted on the cover 4 with the terminal block mounting member 11 housed inside.

  A circular window opening 411 opens at the center of the bottom wall 41. A pair of holes 421 are formed in the left and right upper portions of the side wall 42 so as to penetrate right and left.

  As shown in FIG. 3, the terminal block attachment member 11 is attached to the cover 4 at a portion on the other end side in the direction of the axis 40 (a portion on the lower end side in this embodiment). Specifically, as shown in FIG. 7, a screw hole 412 is formed on the left side of the rear portion of the bottom wall 41 of the cover 4. Further, at a position corresponding to the screw hole 412 of the rear mounting piece 64 of the first case body 60, a hole through which the head of the fastener 413 made of a screw passes is formed. In addition, in the present disclosure, when a hole simply through which a fastener made of a screw passes is used, a shaft portion of the screw passes, but a head portion of the screw does not pass. A hole 682 through which the fastener 413 passes is formed at a position corresponding to the screw hole 412 of the lower piece 68 of the second case body 65.

  From the upper side, the fastener 413 is passed through the hole formed in the rear mounting piece 64 of the first case body 60 and the hole 682 formed in the lower piece 68 of the second case body 65, and the screw of the bottom wall 41 of the cover 4 is screwed. The fastener 413 is screwed into the hole 412. Further, from the upper side, a fastener 692 made of a screw is passed through a hole 691 formed in the front attachment piece 69 of the second case body 65, and a fastener 692 is fitted in a screw hole 417 formed in the bottom wall 41 of the cover 4. Is screwed in. As a result, the case 6 is attached to the cover 4 as shown in FIGS.

  Further, as shown in FIG. 7, a recess 414 is formed on the right side of the rear side portion of the bottom wall 41 of the cover 4 and is formed by a notch and for avoiding interference with the fixture 684.

  As shown in FIG. 9, the lighting fixture 1 further includes a building attachment member 7 and a wire 8. As shown in FIGS. 1 and 2, the building mounting member 7 has a plate-shaped portion mounted on the building, and the cover 4 is mounted at the opening 43 of the cover 4. The building attachment member 7 includes a top plate 71 that is a plate-like portion, a front leg piece 72, a pair of left and right leg pieces 73, and a pair of left and right fixing pieces 74. The building attachment member 7 is integrally formed of a metal plate such as a steel plate.

  As shown in FIG. 2, the top plate 71 is formed in a quadrilateral shape in which two opposing sides of the four sides are arcuate. A daruma hole 711 is formed at the front end of the top plate 71 so as to vertically penetrate therethrough. A hole 712 penetrating vertically is formed at the rear end of the top plate 71. The building attachment member 7 has a part of an electric wire opening 710 through which an electric wire connected to the terminal block 3 passes. An electric wire slit may be formed instead of the electric wire opening 710.

  As shown in FIG. 9, the wire 8 has a connecting portion 81 having a hole on one end side. A fastener 722 made of a screw is passed through the hole of the connection portion 81 from the rear side, and is screwed into a screw hole 721 formed in the leg piece 72 of the building attachment member 7. As a result, one end of the wire 8 is connected to the building mounting member 7.

  The wire 8 has a connecting portion 82 having a hole on the other end side. A fastener 416 composed of a screw is passed through the hole of the connection portion 82 from above, and the fastener 416 is screwed into a screw hole 415 (see FIG. 7) formed on the left side of the front wall of the bottom wall 41 of the cover 4. As a result, the other end of the wire 8 is connected to the cover 4. By providing the wire 8, the cover 4 is prevented from falling.

As shown in FIG. 2, the fixed piece 74 of the building mounting member 7 is formed with screw holes 741 penetrating left and right. In the pair of holes 421 formed in the left and right portions of the upper portion of the side wall 42 of the cover 4,
A fixing tool 742 made of a screw is passed from the outside, and the fixing tool 742 is screwed into the screw hole 741 to attach the cover 4 to the building mounting member 7.

  As shown in FIG. 3, the direction of the normal line 141 of the terminal block mounting surface 14 is inclined at an angle of 15 degrees or more and 75 degrees or less with respect to the direction along the axis 40 and toward the opening 43. As a result, as shown in FIG. 9, it is easy to insert the wire into the cover 4 through the opening 43 and insert the wire into the insertion holes 31 and 32.

  Further, the terminal block 3 is located at a position different from the electric wire opening 710 when viewed in the direction of the axis 40. This makes it difficult for dust such as dust to enter the opening 43 and adhere to the terminal block 3.

  As shown in FIG. 3, the terminal block mounting portion 13 is located on one end side (upper side in the present embodiment) in the direction of the axis 40 than the portion of the terminal block mounting member 11 mounted on the cover 4. Therefore, as shown in FIG. 2, when the electric wire is inserted into the insertion holes 31 and 32, the terminal block mounting member 11 may be bent. Therefore, the terminal block mounting portion 13 is separated from the inner surface of the side wall 42 of the cover 4 with a gap of a predetermined length or less. More specifically, the terminal block mounting portion 13 has a plate shape, and the left and right ends thereof are bent rearward to form the support piece 133. A gap having a predetermined length or less is formed between the support piece 133 and the inner surface of the side wall 42 of the cover 4. In this case, when the electric wire is inserted into the insertion holes 31 and 32, even if the terminal block mounting member 11 bends, if the supporting piece 133 moves by a predetermined length, it comes into contact with the inner surface of the side wall 42 of the cover 4, As a result, the bending is suppressed. As a result, it is possible to suppress the terminal block mounting member 11 from being largely bent and plastically deformed. The predetermined length is preferably determined within a range in which the terminal block mounting member 11 is not plastically deformed, that is, in a range in which the terminal block mounting member 11 is elastically deformed. The terminal block mounting portion 13 may contact the inner surface of the side wall 42.

  As shown in FIG. 8, the connecting portion 82 on the other end side of the wire 8 is connected to the cover 4 at a position displaced from the center of gravity of the entire cover 4 to which the terminal block mounting member 11 is mounted. Further, the terminal block mounting portion 13 is located on the opposite side of the portion of the connecting portion 82 on the other end side of the wire 8 connected to the cover 4 with the center of gravity therebetween. Therefore, when the cover 4 to which the terminal block mounting member 11 is mounted via the wire 8 is hung, the portion where the terminal block mounting portion 13 is located is lowered, and the insertion surface 33 faces generally upward. The wire 8 contacts the edge of the opening 43 of the cover 4. This facilitates the wire 8 to be housed in the cover 4.

  Further, as shown in FIG. 4, the connecting portion 81 of the wire 8 on one end side attached to the building attaching member 7 intersects with the axis 40 direction. This makes it easier to insert the electric wire into the insertion holes 31 and 32.

  Further, as shown in FIG. 2, the front piece 67 of the second case body 65 has a flange portion 673. Further, as shown in FIG. 7, ribs 423 forming slits 422 are formed on the left and right sides of the inner surface of the side wall 42 of the cover 4, respectively. As shown in FIG. 8, the flange portion 673 enters the slit 422 between the ribs 423. As a result, the wire 8 is restricted from moving beyond the rib 423 and the flange portion 673 in the cover 4. The rib 423 and the flange portion 673 serve as a regulation portion that regulates the movement of the wire 8 in the cover 4.

  As shown in FIG. 3, the space surrounded by the insulating sheet 54 and in which the circuit board 51 is located communicates with the space outside the case 6 in the direction of the axis 40. That is, from the space where the circuit board 51 is located, the heated air escapes to the space above the case 6 through the terminal block slit 151. In addition, the heat-laden air that has escaped to the space above the case 6 escapes to the space above the cover 4 via the electric wire opening 710. As a result, heat is efficiently dissipated.

  As is apparent from the above-described embodiment, the lighting fixture 1 of the first aspect includes the light source 20, the circuit board 51 having the circuit component 52, the case 6 that houses the circuit board 51, and the case 6 inside. And a cover 4 to be housed in. The cover 4 has a cylindrical side wall 42 surrounding the axis 40, and an opening 43 formed at one end of the side wall 42 in the direction of the axis 40 and through which the case 6 passes. The circuit board 51 is attached to the surface of the case 6 along the axis 40 via an insulating sheet 54. The insulating sheet 54 has an insulating portion 541 located between the circuit board 51 and the case 6, and an extending portion 542 extending from the insulating portion 541. The extending portion 542 surrounds the circuit board 51 around the axis 40 and is open in the direction of the axis 40.

  According to the first aspect, the extending portion 542 of the insulating sheet 54 surrounds the circuit board 51 around the axis 40 and is open in the direction of the axis 40. Therefore, the extending portion 542 forms a flow path for the draft flow. As a result, an updraft is efficiently generated. This improves the heat dissipation performance of the circuit board 51.

  The second aspect is realized by a combination with the first aspect. In the second aspect, the extending portion 542 is located at a part around the axis 40 of the circuit board 51.

  According to the second aspect, the heat dissipation performance is improved by the slightly extending portion 542 of the insulating sheet 54.

  The third aspect is realized by a combination with the first or second aspect. In the third aspect, in the extending portion 542, the tip end portion extending from the insulating portion 541 is a free end, and the insulating sheet regulation that regulates the position of the tip end portion so as to surround the circuit board 51 around the axis 40. Section.

  According to the third aspect, the movement of the tip portion of the extending portion 542 is restricted.

  The fourth aspect is realized by a combination with any one of the first to third aspects. In the fourth aspect, the length of the insulating sheet 54 along the axis 40 direction is greater than or equal to the length of the circuit board 51 along the axis 40 direction.

  According to the fourth aspect, the draft flow is likely to occur, and cooling is performed by the draft flow over the entire length of the circuit board 51 along the axis 40 direction.

  The fifth aspect is realized by a combination with any one of the first to fourth aspects. In the fifth aspect, the space surrounded by the insulating sheet and in which the circuit board 51 is located communicates with the space outside the case 6 in the direction of the axis 40.

  According to the fifth aspect, the heated air escapes into the space above the case 6 to efficiently dissipate heat.

1 Lighting Equipment 20 Light Source 4 Cover 40 Axis 42 Sidewall 43 Opening 51 Circuit Board 52 Circuit Component 54 Insulating Sheet 541 Insulating Part 542 Extending Part 6 Case

Claims (5)

A light source,
A circuit board having circuit parts;
A case accommodating the circuit board,
A cover for accommodating the case inside,
The cover has a cylindrical side wall surrounding an axis, and an opening formed in one end of the side wall in the axial direction and through which the case passes,
The circuit board is attached to the surface of the case along the axis through an insulating sheet,
The insulating sheet has an insulating portion located between the circuit board and the case, and an extending portion extending from the insulating portion,
The extension part surrounds the circuit board around the axis and is open in the axis direction. The lighting device according to claim 1, wherein the extending portion is located at a part around the axis of the circuit board. The extension portion has a free end at a tip portion extended from the insulating portion, and includes an insulating sheet regulation portion that regulates a position of the tip portion so as to surround the circuit board around the axis. The lighting fixture according to 1 or 2. The luminaire according to any one of claims 1 to 3, wherein a length of the insulating sheet along the axial direction is equal to or longer than a length of the circuit board along the axial direction. The lighting device according to claim 1, wherein a space surrounded by the insulating sheet and in which the circuit board is located communicates with a space outside the case in the axial direction.

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