WO2014041810A1 - 照明器具 - Google Patents
照明器具 Download PDFInfo
- Publication number
- WO2014041810A1 WO2014041810A1 PCT/JP2013/005419 JP2013005419W WO2014041810A1 WO 2014041810 A1 WO2014041810 A1 WO 2014041810A1 JP 2013005419 W JP2013005419 W JP 2013005419W WO 2014041810 A1 WO2014041810 A1 WO 2014041810A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- circuit board
- top plate
- lighting fixture
- attached
- box
- Prior art date
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S8/00—Lighting devices intended for fixed installation
- F21S8/04—Lighting devices intended for fixed installation intended only for mounting on a ceiling or the like overhead structures
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S8/00—Lighting devices intended for fixed installation
- F21S8/03—Lighting devices intended for fixed installation of surface-mounted type
- F21S8/033—Lighting devices intended for fixed installation of surface-mounted type the surface being a wall or like vertical structure, e.g. building facade
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V23/00—Arrangement of electric circuit elements in or on lighting devices
- F21V23/003—Arrangement of electric circuit elements in or on lighting devices the elements being electronics drivers or controllers for operating the light source, e.g. for a LED array
- F21V23/004—Arrangement of electric circuit elements in or on lighting devices the elements being electronics drivers or controllers for operating the light source, e.g. for a LED array arranged on a substrate, e.g. a printed circuit board
- F21V23/006—Arrangement of electric circuit elements in or on lighting devices the elements being electronics drivers or controllers for operating the light source, e.g. for a LED array arranged on a substrate, e.g. a printed circuit board the substrate being distinct from the light source holder
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V23/00—Arrangement of electric circuit elements in or on lighting devices
- F21V23/003—Arrangement of electric circuit elements in or on lighting devices the elements being electronics drivers or controllers for operating the light source, e.g. for a LED array
- F21V23/007—Arrangement of electric circuit elements in or on lighting devices the elements being electronics drivers or controllers for operating the light source, e.g. for a LED array enclosed in a casing
- F21V23/009—Arrangement of electric circuit elements in or on lighting devices the elements being electronics drivers or controllers for operating the light source, e.g. for a LED array enclosed in a casing the casing being inside the housing of the lighting device
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
- F21V29/50—Cooling arrangements
- F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2115/00—Light-generating elements of semiconductor light sources
- F21Y2115/10—Light-emitting diodes [LED]
Definitions
- the present invention relates to a lighting device installed in a mounted portion that is a construction material such as a ceiling or a wall.
- the lighting fixture 100 described in Patent Document 1 includes a fixture main body 101, an LED unit 102, a power supply unit 103, a cover 104, an insulating cover 105, a lens 106, and the like.
- the instrument main body 101 has a box shape with an opening (opening 107) on the lower side, and has a partition 108 for isolating the upper part and the lower part of the instrument main body 101 inside.
- the partition plate portion 108 has a bottom plate 109 at the lower portion, and the LED unit 102 is attached to the lower surface of the bottom plate 109.
- the LED unit 102 has a plurality of LED elements 111 mounted on the lower surface of an LED substrate 110 formed in an annular shape.
- the irradiation direction side of LED unit 102 (the lower side shown in FIG. 7) is covered with a lens 106.
- the lens 106 is attached to the lower surface of the partition plate portion 108 with a screw 115.
- the power supply unit 103 includes a substrate 120 and an electronic component 121 mounted on the substrate 120.
- One side of the board 120 on which the relatively tall electronic component 121 exists is positioned on the attached surface side (upper side shown in FIG. 7), and the other board surface side that is the solder surface side is on the bottom plate side. It is located facing. For this reason, the substrate 120 is disposed close to the bottom plate 109. Further, as shown in FIG. 7, the LED unit 102 and the power supply unit 103 are provided on the same axis of the lighting fixture 100.
- the cover 104 has a male threaded portion 112 on the outer periphery of the upper end, and is attached to the instrument main body 101 by screwing the male threaded part 112 into the female threaded part 113 of the instrument main body 101.
- the opposite side surface of the LED substrate 110 corresponding to the place where the LED element 111 of the LED unit 102 is mounted is in contact with the bottom plate 109, but the other part. Is not in contact with the bottom plate 109 and there is a space 114. For this reason, there existed a problem that there was a limit to the heat dissipation which dissipates the heat which LED element 111 emitted.
- This invention was made in order to solve the conventional problem, and it aims at providing the lighting fixture which can obtain the favorable heat dissipation which dissipates the heat which the light emitting element emitted.
- the lighting fixture of the present invention includes a fixture main body attached to a surface to be attached, a box portion provided on the fixture main body, with a top plate protruding on the opposite side of the attachment surface, and a translucency covering the box portion. And a power supply unit housed in a recessed portion on the mounting surface side of the box part, and an electronic component mounted on the first circuit board, and a top plate of the box part on the side opposite to the power supply part
- a light-emitting portion having a two-circuit board mounted thereon and a light-emitting element mounted on the second circuit board; a connection line connecting the first circuit board and the second circuit board through an insertion hole provided in the top plate;
- the second circuit board is in contact with the top plate at the back of the portion where the light emitting element is mounted.
- the first circuit board is arranged such that a surface having a large amount of heat generation is directed to the side opposite to the top plate.
- the first circuit board includes a first mounting component group in which a plurality of electronic components are mounted on a first surface that generates a large amount of heat, and a second side opposite to the first surface.
- a second mounting component group having a plurality of electronic components mounted on the surface, and the bulky electronic component in the second mounting component group is bulkier than the bulky electronic component in the first mounting component group.
- the first circuit board is fixed to the box portion with a fixing screw.
- the lighting fixture of the present invention has a bottomed cylindrical inner cover that covers the second circuit board and is fixed to the top plate, and a protrusion provided inside the inner cover has the second cover.
- the second circuit board is pressed against the top plate through a peripheral portion of the light emitting element in the circuit board.
- the back of the portion where the light emitting element is mounted is in contact with the top board, so that the heat generated by the light emitting element flows from the second circuit board to the top board.
- the lighting fixture of 1st Embodiment is demonstrated using drawing.
- the luminaire 10 ⁇ / b> A of the first embodiment can be used by being attached to a ceiling surface or a wall surface that is an attached portion.
- the case where it attaches to the ceiling surface 11 is demonstrated.
- the irradiation direction is referred to as “front” or “front”
- the direction opposite to the irradiation direction is referred to as “rear” or “rear”.
- the lighting fixture 10 ⁇ / b> A has a fixture main body 20 ⁇ / b> A attached to the ceiling surface 11.
- the instrument body 20 ⁇ / b> A includes a cylindrical tube portion 21 and a disk-shaped bottom plate 22 provided at the rear end of the tube portion 21.
- the instrument body 20 ⁇ / b> A is so-called directly fixed to the ceiling surface 11 by inserting attachment screws 24 through a plurality of (here, two) through holes 23 provided in the bottom plate 22.
- a plurality of (here, three) mounting springs 25 are provided on the front surface of the bottom plate 22 so as to extend forward at substantially equal intervals (see FIGS. 2 and 3).
- the mounting spring 25 is once bent toward the center side of the instrument body 20A, and then the tip (front end) is bent outward, so that the entire mounting spring 25 is formed in a “ ⁇ ” shape.
- the tip of the mounting spring 25 can be elastically deformed outward (see arrow A in FIG. 3).
- a translucent cover 30A is detachably attached to the front side of the instrument body 20A.
- the cover 30A has a substantially hemispherical shape as a whole, and a mounting portion 31 having an L-shaped cross section is provided on the rear end surface over the entire circumference.
- the attachment portion 31 is provided with an annular plate-like base plate 32 from the rear end surface of the cover 30A toward the center side, and a cylindrical support portion 33 is provided rearward from the center side end portion of the base plate 32. Is provided.
- a locking portion 34 is provided at the rear end of the support portion 33 toward the outside.
- the cover 30A can be attached using the elastic deformation of the attachment spring 25. That is, when the locking portion 34 passes through the mounting spring 25, the mounting spring 25 pushed and spread by the locking portion 34 returns to the center side, so that the locking portion 34 is locked by the mounting springs 25 present at three locations. Thus, the cover 30A is locked to the instrument body 20A. Further, when removing the cover 30A, if the cover 30A is pulled forward, the attachment spring 25 is elastically deformed outward, so that the cover 30A can be easily removed.
- the bottom plate 22 of the instrument main body 20 ⁇ / b> A is provided with a box portion 40 having a substantially central portion protruding forward and having a space on the attached portion side.
- the front of the instrument body 20A is covered with a cover 30A.
- a step portion 43 is provided at the boundary between the bottom plate 22 and the box portion 40, and a peripheral portion of a first circuit board 45 described later is placed thereon.
- the box portion 40 has a rectangular box shape, and includes four side plates 41 and a top plate 42 at the front end of the side plates 41.
- the side plate 41 has a crank-shaped cross section having a stepped portion 43.
- the first circuit board 45 is fixed to the rear surface of the step portion 43 in the recess 44 formed in the space surrounded by the top plate 42 and the side plate 41 and formed on the mounting surface side of the bottom plate 22 of the instrument body 20A. Attached by.
- the box portion 40 is a quadrangular shape including a top plate 42 and four side plates 41, but may be a cylindrical shape having a top plate.
- a plurality of electronic components 47 are mounted on the first circuit board 45 to form a power supply unit 48.
- the electronic component 47 also includes a portion where a terminal of a so-called electronic component is soldered to the circuit pattern.
- the first circuit board 45 is disposed with the first surface 451 that generates a large amount of heat directed toward the rear side.
- the surface having a large amount of heat generation is, for example, a surface on which a circuit pattern is formed, a surface having a large total circuit pattern area in the case of a double-sided pattern, a surface on which solder is applied, or a solder surface area in the case of double-sided soldering. It can be a surface with a large total amount.
- a circuit pattern is provided and the soldered surface is shown as a surface with a large amount of heat generation.
- An insulating sheet 49 is provided on the rear side of the first circuit board 45 to electrically insulate the power supply unit 48. Further, a lid 49a is provided on the insulating sheet 49, and the box portion 40 is closed.
- An electronic component 47 is mounted on the first surface 451 of the first circuit board 45 to form a first mounted component group 501.
- a plurality of electronic components 47 are mounted on the second surface 452 opposite to the first surface 451 to form a second mounted component group 502.
- the electronic component 47 is arranged so that the electronic component 472 having the highest bulkiness (H2) in the second mounting component group 502 is higher than the electronic component 471 having the highest bulkiness (H1) in the first mounting component group 501. .
- a pair of lens mounting bases 51 are provided on the front surface of the top plate 42 so as to protrude forward, and screw holes 52 are provided on the front surface of the lens mounting base 51.
- the pair of lens mounts 51 are disposed at symmetrical positions with respect to the approximate center of the instrument body 20A.
- a second circuit board 53 is attached to the front surface of the central top plate 42 of the pair of lens mounting bases 51.
- An LED (Light-Emitting Diode) 54 as a light emitting element is mounted on the front surface of the second circuit board 53 to form a light emitting unit 55.
- a heat dissipation sheet may be interposed between the second circuit board 53 and the front surface of the top plate 42.
- the second circuit substrate 53 a substrate formed by bonding or etching a metal body such as a heat-dissipating copper foil electrically insulated from the front surface or a resin having excellent thermal conductivity on the back surface is used. May be. According to this, heat can be transmitted from the metal body or resin for heat dissipation to the top plate 42, and heat dissipation can be improved.
- a metal body such as a heat-dissipating copper foil electrically insulated from the front surface or a resin having excellent thermal conductivity on the back surface. May be. According to this, heat can be transmitted from the metal body or resin for heat dissipation to the top plate 42, and heat dissipation can be improved.
- the number of LEDs 54 is not limited. For example, a plurality of LEDs 54 are arranged in a circle.
- the second circuit board 53 is arranged such that the LED 54 is positioned at the approximate center of the instrument body 20A.
- the first circuit board 45 and the second circuit board 53 are connected by a connection line 57 that passes through an insertion hole 56 provided in the top plate 42.
- a bottomed cylindrical inner cover 60 having translucency is provided on the front side of the light emitting unit 55.
- the inner cover 60 has a cylindrical tube portion 61 and a lens portion 62 provided at the front end of the tube portion 61.
- the cylindrical portion 61 is provided with a pair of brackets 63 protruding outward at a symmetrical position, and the bracket 63 is provided with a through-hole 64 for attachment.
- a pair of protruding portions 67 are provided to protrude rearward.
- the pair of projecting portions 67 are formed of a part of a circular shape concentric with the cylindrical portion 61 and are provided to face each other.
- the protrusion part 67 was made into a pair, it may be cylindrical or may be provided with two or more as the protrusion part 67.
- the fixing screw 66 is passed through the through hole 64 of the bracket 63 via the washer 65, and the fixing screw 66 is fastened to the screw hole 52 of the lens mounting base 51 provided on the top plate 42. Then, the inner cover 60 is fixed to the box part 40. At this time, the second circuit board may be pressed against the top plate 42 by a part of the inner cover 60.
- the front end (rear end) 671 of the projecting portion 67 presses the peripheral portion 531 near the outside of the LED 54 in the second circuit board 53 as the screw 66 is tightened (see the broken line arrow A in FIG. 4).
- the second circuit board 53 is configured to be pressed against the top plate 42.
- the length of the projecting portion 67 may be slightly bent so as to be pressed against the second circuit board 53. Good.
- the protrusion part 67 exists in the circumference
- the light emitted from the LED 54 to the outside through the inner cover 60 and the cover 30A via the protrusion 67 may be reflected on the cover 30A and the quality of the light may be reduced.
- the inner cover 60 milky white having translucency, the light from the LED 54 can be diffused to make the shadow of the protruding portion 67 inconspicuous, and deterioration of the light quality can be prevented.
- the instrument main body 20 ⁇ / b> A attached to the ceiling surface 11 is provided with a box part 40 from which the top plate 42 protrudes on the opposite side to the ceiling surface 11, and translucent covering the box part 40.
- the cover 30A is provided.
- a power supply unit 48 in which an electronic component 47 is mounted on the first circuit board 45 is accommodated in the recess 44 on the ceiling surface 11 side in the box unit 40.
- a light emitting unit 55 in which an LED 54 is mounted on a second circuit board 53 is attached to the top plate 42 of the box 40 opposite to the power supply unit 48.
- the first circuit board 45 and the second circuit board 53 are connected by a connection line 57 through an insertion hole 56 provided in the top plate 42.
- the back of the place where the LED 54 is mounted is in contact with the top plate 42, so that the heat generated by the LED 54 flows from the second circuit board 53 to the top plate 42, and the side plate 41, It is transmitted to the ceiling surface and the tube portion 21 through the bottom plate 22.
- the heat generated by the LED 54 can be dissipated from the cylindrical portion 21 to the outside, or transmitted to the ceiling and dissipated, so that good heat dissipation can be obtained and the characteristics of the LED 54 are deteriorated by heat. Adverse effects can be prevented.
- the heat dissipation sheet, the metal body for heat dissipation, and resin are interposed between the 2nd circuit board 53 and the top plate 42, favorable heat dissipation can be obtained similarly.
- the case where such a heat radiating sheet, a heat radiating metal body, or a resin is interposed is included as a configuration in which the back of the portion where the light emitting element is mounted is in contact with the top plate.
- the first circuit board 45 on which the electronic component 47 is mounted in the power supply unit 48 is disposed so that the surface that generates a large amount of heat is directed away from the top plate 42.
- the heat generated from the electronic component 47 is mainly the mounting surface of the adjacent mounting portion. It will be transmitted to and will be radiated.
- the surface having a large amount of heat generation is separated from the top plate 42 of the box portion 40, the surface is less susceptible to the heat generated by the electronic component 47, and the heat generated by the LED 54 is transmitted from the second circuit board 53 to the top plate. It tends to flow to 42 and be discharged.
- the route through which the heat of each of the first circuit board and the second circuit board is dissipated can be made different, and thereby, good heat dissipation that releases the heat generated by the LED 54 can be obtained.
- the first mounting component group 501 in which a plurality of electronic components 47 are mounted is disposed on the first surface 451 that generates a large amount of heat, and the second surface on the side opposite to the first surface 451 is disposed.
- a second mounting component group 502 in which a plurality of electronic components 47 are mounted is disposed on the surface 452. Since the electronic component 472 having the highest bulk H2 is arranged in the second mounting component group 502, the first circuit board 45 is separated from the top plate 42 of the box 40.
- the heat insulation space can be made larger than before without changing the size of the recess 44, and therefore, Since the top plate 42 of the box 40 is not easily affected by the heat generated by the electronic component 47, it is possible to reduce the adverse effects caused by the heat from the electronic component 47 on the LED 54.
- the heat generated by the LED 54 is transmitted to the top plate 42 and the side plate 41 and released from, for example, the ceiling surface 11 or the cylindrical portion 21 of the instrument main body, so that good heat dissipation and characteristics such as the luminous efficiency of the LED 54 are reduced. Can be prevented.
- the heat insulation space makes it difficult for the heat of the LED 54 to be transmitted to the electronic component 47 through the top plate 42, so that the adverse effect of the heat of the LED 54 on the electronic component 47 can be reduced.
- the first circuit board 45 is fixed to the box part 40 by the fixing screws 46, the first circuit board 45 can be securely attached to the box part 40.
- the protruding portion 67 provided inside the bottomed cylindrical inner cover 60 presses the peripheral portion 531 of the LED 54 in the second circuit board 53 and presses the second circuit board 53 against the top plate 42.
- the second circuit board 53 can be securely attached to the top plate 42.
- the heat of the LED 54 is likely to be trapped in the space in the inner cover 60, and thus the LED 54 is likely to be adversely affected by the heat of the LED 54 itself. Therefore, since the back of the place where the LED 54 is mounted is surely in contact with the top plate 42, the heat generated by the LED 54 can be transmitted to the top plate 42, and good heat dissipation can be obtained. Can be prevented from decreasing.
- the lighting fixture of 2nd Embodiment is demonstrated based on FIG. 6 (A)-FIG. 6 (D).
- symbol is attached
- the fixture body 20A according to the first embodiment described above the fixture body 20A is formed in a cylindrical shape, and the cover 30A is formed in a hemispherical shape.
- the fixture main body 20B according to the second embodiment is formed in a rectangular cylindrical shape, and the cover 30B is a rectangular box opened on the fixture main body 20B side. Formed into a shape.
- the lighting fixture of the present invention is not limited to the above-described embodiments, and appropriate modifications and improvements can be made.
- the LED 54 is used as the light emitting element is illustrated, but the present invention can also be applied to EL (Electro Luminescence).
Abstract
Description
図7に示すように、特許文献1に記載の照明器具100は、器具本体101と、LEDユニット102と、電源ユニット103と、カバー104と、絶縁カバー105と、レンズ106等を有する。
LEDユニット102は、円環形状に形成されたLED基板110の下面に複数のLED素子111が実装されている。LEDユニット102の照射方向側(図7に示す下方)はレンズ106で覆われている。レンズ106は、ねじ115によって隔板部108の下面に取り付けられる。
また、カバー104は、上端部の外周部に雄ねじ部112を有し、この雄ねじ部112を器具本体101の雌ねじ部113にねじ込むことにより器具本体101に取り付けられる。
このため、LED素子111が発した熱を放熱する放熱性に限界があるという問題があった。
以下、第1実施形態の照明器具について、図面を用いて説明する。
図1に示すように、第1実施形態の照明器具10Aは、被取付部である天井面や壁面に取り付けて使用することができる。ここでは、天井面11に取り付ける場合について説明する。
また、以下の説明において、照射方向を「前」あるいは「前方」といい、照射方向と反対方向を「後」あるいは「後方」ということとする。
器具本体20Aは、底板22に設けられている複数(ここでは、2個)の貫通孔23に取付ねじ24を挿通して、天井面11にいわゆる直付け固定される。
取付ばね25は、一旦、器具本体20Aの中心側に屈曲した後、先端(前端)が外側に屈曲して、全体「く」字形状に形成されている。
取付ばね25の先端は、外側(図3中矢印A参照)に弾性変形可能となっている。
カバー30Aは、全体略半球形状を呈しており、後端面には、断面L字形状の取付部31が全周にわたって設けられている。
取付部31は、カバー30Aの後端面から中心側に向かって円環板状のベース板32が設けられており、ベース板32の中心側端部から後方に向かって円筒形状の支持部33が設けられている。
支持部33の後端には、外側に向かって係止部34が設けられている。
また、カバー30Aを取り外す際には、カバー30Aを前方に引けば取付ばね25が外側へ弾性変形するので、容易に取り外すことができる。
図4に示すように、箱部40は矩形箱状をしており、4個の側板41を有するとともに側板41の前端に天板42を有する。側板41は、段部43を有するクランク状の断面を有する。
天板42と側板41で囲われた空間であって、器具本体20Aの底板22における被取付面側に形成された凹部44においては、段部43の後面に第1回路基板45が固定ビス46によって取り付けられる。なお、箱部40は天板42と4個の側板41からなる4角形であるが、天板を有する円筒形状でもよい。
第1回路基板45は、発熱量が多い第1面451を後側に向けて配置される。
ここで、発熱量が多い面とは、例えば回路パターンが形成されている面、両面パターンの場合は回路パターンの総面積が多い面、はんだが施されている面、両面はんだの場合ははんだ表面積の総量が多い面等とすることができる。
図4においては、回路パターンが設けられて、はんだ付けされた面を発熱量が多い面として示した。
なお、第1回路基板45の後側には絶縁シート49が設けられており、電源部48を電気的に絶縁している。また、絶縁シート49の上に蓋49aを設け、箱部40が閉塞されている。
第1面451とは反対側の第2面452には、複数の電子部品47が実装されて、第2実装部品群502が形成される。
電子部品47は、第1実装部品群501において最も嵩高(H1)の電子部品471よりも、第2実装部品群502において最も嵩高(H2)の電子部品472の方が嵩高となるように配置する。
一対のレンズ取付台51の中央の天板42の前面には、第2回路基板53が取り付けられている。第2回路基板53の前面には、発光素子としてのLED(Light-Emitting Diode)54が実装されて、発光部55を形成する。第2回路基板53と天板42の前面との間に放熱シートを介在させてもよい。あるいは第2回路基板53として、裏面において、前面とは電気的に絶縁された放熱用の銅箔等の金属体や熱伝導性に優れた樹脂等を接着やエッチング加工等で形成した基板を用いてもよい。これによれば、放熱用の金属体や樹脂から天板42に熱を伝えることができ、放熱性を向上できる。
第1回路基板45および第2回路基板53は、天板42に設けられた挿通孔56を貫通して配線される接続線57によって接続される。
図5にも示すように、インナーカバー60は、円筒形状の筒部61と、筒部61の前端に設けられたレンズ部62を有する。
筒部61には、対称位置において外側に張り出す一対のブラケット63が設けられており、ブラケット63には取付用の貫通孔64が設けられている。
インナーカバー60の内部におけるレンズ部62の後側には、一対の突出部67が後方に突出して設けられている。
一対の突出部67は、筒部61と同心の円形の一部から構成されており、対向して設けられる。なお、突出部67は一対としたが、筒状としてもよく、あるいは突出部67として複数本設けてもよい。
このとき、インナーカバー60の一部で第2回路基板を天板42へ押し付けるように構成してもよい。本実施形態では、ねじ66の締め付けに伴って突出部67の先端(後端)671は、第2回路基板53におけるLED54の外側近傍の周部531を押圧し(図4中破線矢印A参照)、第2回路基板53を天板42に押し付けるように構成されている。例えば、インナーカバー60のレンズ取付台51へのねじ締め後において、突出部67の長さを、第2回路基板53に向かって押し付けるようにわずかに撓らせることができるような長さとしてもよい。また、突出部67はLED54の周囲に存在するため、LED54の光を妨げないようインナーカバー60と同等な透光性を有することが好ましい。また、LED54の光のうち突出部67を介してインナーカバー60とカバー30Aを通じ外へ放出された光は、突出部67の影がカバー30Aに映りこみ光の質を低下させる恐れがあるため、インナーカバー60を透光性を有する乳白色とすることで、LED54からの光を拡散させて突出部67の影を目立たなくすることができ、光の質を低下することを防止できる。
図1に示すように、天井面11に取り付けられる器具本体20Aには、天井面11とは反対側に天板42が突出する箱部40が設けられており、箱部40を覆う透光性のカバー30Aを有する。箱部40における天井面11側の凹部44には、第1回路基板45に電子部品47が実装された電源部48が収容される。
電源部48とは反対側の箱部40の天板42には、第2回路基板53にLED54が実装された発光部55が取り付けられる。
第1回路基板45と第2回路基板53は、天板42に設けられた挿通孔56を通じて、接続線57により接続される。
このため、第1回路基板の発熱量の多い面は天井等の被取付面側に位置することとなるため、電子部品47から発生した熱は、主に、近接する被取付部の被取付面に伝わることとなり放熱される。また、発熱量の多い面が、箱部40の天板42から距離が離れるため、電子部品47が発した熱の影響を受けにくくなり、LED54が発した熱が第2回路基板53から天板42に流れて放出され易い。すなわち、第1回路基板と第2回路基板とのそれぞれの熱が放熱されるルートを異ならせることができ、これにより、LED54が発した熱を放出する良好な放熱性を得ることができる。また、電子部品47の熱と、LED54との熱とが天板42を介して互いに悪影響を及ぼしあうことも防止できる。
そして、最も嵩高H2の電子部品472を第2実装部品群502に配置したので、第1回路基板45は箱部40の天板42から離れる。
また、LED54が発した熱を天板42や側板41に伝え、例えば天井面11や器具本体の筒部21等から放出させることで良好な放熱性と、LED54の発光効率等の特性の低下を防止することができる。
また、この断熱空間によりLED54の熱が天板42を介して電子部品47に伝わりにくくなるため、LED54の熱が電子部品47に与える悪影響を低減することができる。
次に、第2実施形態の照明器具を図6(A)~図6(D)に基づいて説明する。
なお、前述した第1実施形態の照明器具10Aと共通する部位には同じ符号を付して、重複する説明を省略することとする。
前述した第1実施形態に係る照明器具10Aでは、器具本体20Aを円筒形状に形成するとともに、カバー30Aを半球状に形成した。
図6(A)~図6(D)に示すように、第2実施形態に係る照明器具10Bでは、器具本体20Bを矩形筒形状に形成し、カバー30Bを、器具本体20B側が開口した矩形箱状に形成した。
例えば、前述した各実施形態においては、発光素子としてLED54を用いた場合を例示したが、本発明はEL(Electro Luminescence)にも適用可能である。
11 天井面(被取付面)
20A、20B 器具本体
30A、30B カバー
40 箱部
42 天板
44 凹部
45 第1回路基板
451 第1面
452 第2面
46 固定ビス
47 電子部品
48 電源部
501 第1実装部品群
502 第2実装部品群
53 第2回路基板
531 周部
54 LED(発光素子)
55 発光部
56 挿通孔
57 接続線
60 インナーカバー
67 突出部
Claims (5)
- 被取付面に取り付けられる器具本体と、
前記器具本体に設けられ、前記被取付面とは反対側に天板が突出する箱部と、
前記箱部を覆う透光性のカバーと、
前記箱部における前記被取付面側の凹部に収容され、第1回路基板に電子部品が実装された電源部と、
前記電源部とは反対側の前記箱部の天板に第2回路基板が取り付けられ、前記第2回路基板に発光素子が実装された発光部と、
前記天板に設けられた挿通孔を通じて前記第1回路基板および前記第2回路基板を接続する接続線と、を備え、
前記第2回路基板は、前記発光素子が実装された箇所の真裏が前記天板に接触している照明器具。 - 請求項1に記載の照明器具において、
前記第1回路基板は、発熱量が多い面が前記天板とは反対側に向けて配置されている照明器具。 - 請求項2に記載の照明器具において、
前記第1回路基板は、発熱量が多い第1面に複数の電子部品が実装された第1実装部品群と、前記第1面とは反対側の第2面に複数の電子部品が実装された第2実装部品群とを有し、
前記第1実装部品群において最も嵩高の電子部品よりも、前記第2実装部品群において最も嵩高の電子部品が嵩高である照明器具。 - 請求項1ないし請求項3のうちのいずれか1項に記載の照明器具において、
前記第1回路基板が前記箱部に固定ビスにより固定されている照明器具。 - 請求項1ないし請求項4のうちのいずれか1項に記載の照明器具において、
前記第2回路基板を覆うとともに前記天板に固定される有底筒状のインナーカバーを有し、
前記インナーカバーの内部に設けられた突出部が前記第2回路基板における前記発光素子の周部を介して前記第2回路基板を前記天板に押し付ける照明器具。
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JP2002304903A (ja) * | 2001-04-04 | 2002-10-18 | Matsushita Electric Works Ltd | 照明器具 |
JP2008204692A (ja) * | 2007-02-19 | 2008-09-04 | Toshiba Lighting & Technology Corp | 照明器具 |
JP2010140843A (ja) * | 2008-12-15 | 2010-06-24 | Rohm Co Ltd | Ledランプ |
JP2011165506A (ja) * | 2010-02-10 | 2011-08-25 | Namio Nakazawa | Ledランプおよびled照明器具 |
JP2012003999A (ja) * | 2010-06-18 | 2012-01-05 | Panasonic Electric Works Co Ltd | 発光ユニット |
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JP4303605B2 (ja) * | 2004-01-22 | 2009-07-29 | パナソニック電工インテリア照明株式会社 | 点灯制御装置及び照明器具 |
JP4851617B1 (ja) * | 2010-11-02 | 2012-01-11 | 株式会社ベスト | Led照明具及びled照明装置 |
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JP2002304903A (ja) * | 2001-04-04 | 2002-10-18 | Matsushita Electric Works Ltd | 照明器具 |
JP2008204692A (ja) * | 2007-02-19 | 2008-09-04 | Toshiba Lighting & Technology Corp | 照明器具 |
JP2010140843A (ja) * | 2008-12-15 | 2010-06-24 | Rohm Co Ltd | Ledランプ |
JP2011165506A (ja) * | 2010-02-10 | 2011-08-25 | Namio Nakazawa | Ledランプおよびled照明器具 |
JP2012003999A (ja) * | 2010-06-18 | 2012-01-05 | Panasonic Electric Works Co Ltd | 発光ユニット |
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WO2017191967A1 (ko) * | 2016-05-02 | 2017-11-09 | 엘지이노텍 주식회사 | 조명장치 |
KR20170124275A (ko) * | 2016-05-02 | 2017-11-10 | 엘지이노텍 주식회사 | 조명장치 |
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KR102523189B1 (ko) | 2016-05-02 | 2023-04-26 | 쑤저우 레킨 세미컨덕터 컴퍼니 리미티드 | 조명장치 |
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