Source: http://www.google.com/patents/US8226270?dq=6,073,142
Timestamp: 2016-09-30 12:55:36
Document Index: 750272289

Matched Legal Cases: ['art 4', 'art 2', 'art 5', 'art 6', 'art 5', 'art 2', 'art 2', 'art 2', 'art 2', 'art 4', 'art 2', 'art 6', 'art 2', 'art 6', 'art 5', 'art 6', 'art 5', 'art 5', 'art 5', 'art 5', 'art 6', 'art 63', 'art 6', 'art 5', 'art 5', 'art 5', 'art 6', 'art 2', 'art 5', 'art 2', 'art 2', 'art 2', 'art 2', 'art 2', 'art 2', 'art 6', 'art 6', 'art 2', 'art 2', 'art 2', 'art 1003', 'art 1002', 'art 1004', 'art 1034', 'art 1003', 'art 1002', 'art 1034', 'art 1032', 'art 1032', 'art 1002', 'art 1002', 'art 1003', 'art 1062', 'art 1063', 'art 1063', 'art 1062', 'art 1063', 'art 1002', 'art 1003', 'art 1071', 'art 1071', 'art 1071', 'art 1002', 'art 1071', 'art 1071', 'art 1056', 'art 1002', 'art 2001', 'art 2004', 'art 2001', 'art 2002', 'art 2001', 'art 2007', 'art 2006', 'art 2005', 'art 2001', 'art 2004', 'art 2017', 'art 2005', 'art 2006', 'art 2015', 'art 2004', 'art 2005', 'art 2001', 'art 2017', 'art 2002', 'art 2002', 'art 2017', 'art 2005', 'art 2017', 'art 2017', 'art 2005', 'art 2006', 'art 2006', 'art 2006', 'art 2007', 'art 2002', 'art 2001', 'art 2005', 'art 2002', 'art 2017', 'art 2002', 'art 2006', 'art 2005', 'art 2005', 'art 2006', 'art 2006', 'art 2063', 'art 2001', 'art 2063', 'art 2017', 'art 2005', 'art 2017', 'art 2005', 'art 2006', 'art 2006', 'art 2006', 'art 2001', 'art 2006', 'art 2005', 'art 2006', 'art 2006', 'art 2006', 'art 2006', 'art 2005', 'art 2005', 'art 2005', 'art 2005', 'art 2004', 'art 2004', 'art 2002', 'art 2017', 'art 2001', 'art 2017', 'art 2005', 'art 2006', 'art 2002', 'art 2001', 'art 2001', 'art 2002', 'art 2002', 'art 2002', 'art 2002', 'art 2002', 'art 2002', 'art 2002', 'art 2006', 'art 2006', 'art 2002', 'art 2006', 'art 2004', 'art 2001', 'art 2006', 'art 2004', 'art 2002', 'Application No. 08764491', 'Application No. 2007', 'application No. 2007']

Patent US8226270 - Lighting device - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsThe lighting device includes: a heat radiating part provided with a cavity that accommodates a part of a plurality of drive circuit components driving a light source module; and a base part provided with a cavity that accommodates another part (e.g., a transistor) of the drive circuit components. Then,...http://www.google.com/patents/US8226270?utm_source=gb-gplus-sharePatent US8226270 - Lighting deviceAdvanced Patent SearchTry the new Google Patents, with machine-classified Google Scholar results, and Japanese and South Korean patents.Publication numberUS8226270 B2Publication typeGrantApplication numberUS 12/451,596PCT numberPCT/JP2008/059418Publication dateJul 24, 2012Filing dateMay 22, 2008Priority dateMay 23, 2007Fee statusPaidAlso published asCN101680613A, CN101680613B, EP2163808A1, EP2163808A4, EP2163808B1, US20100096992, US20120268954, WO2008146694A1Publication number12451596, 451596, PCT/2008/59418, PCT/JP/2008/059418, PCT/JP/2008/59418, PCT/JP/8/059418, PCT/JP/8/59418, PCT/JP2008/059418, PCT/JP2008/59418, PCT/JP2008059418, PCT/JP200859418, PCT/JP8/059418, PCT/JP8/59418, PCT/JP8059418, PCT/JP859418, US 8226270 B2, US 8226270B2, US-B2-8226270, US8226270 B2, US8226270B2InventorsShoji Yamamoto, Hiroyasu Nakagawa, Shinya Sakaida, Fujio Takahashi, Ayanori HamaguchiOriginal AssigneeSharp Kabushiki KaishaExport CitationBiBTeX, EndNote, RefManPatent Citations (25), Non-Patent Citations (3), Referenced by (41), Classifications (30), Legal Events (2) External Links: USPTO, USPTO Assignment, EspacenetLighting device
US 8226270 B2Abstract
The lighting device includes: a heat radiating part provided with a cavity that accommodates a part of a plurality of drive circuit components driving a light source module; and a base part provided with a cavity that accommodates another part (e.g., a transistor) of the drive circuit components. Then, the drive circuit components are accommodated in the cavity of the heat radiating part and the cavity of the base part.
a drive section for driving the LED;
an accommodating part accommodating the drive section; and
a heat radiating part radiating heat from the LED and/or the drive section;
a base part to be connected to an external power supply; and
an insulating part insulating the heat radiating part from the base part,
wherein the accommodating part is tightly closed in at least a part of the heat radiating part, and
the insulating part has a heat radiating part holding cylinder holding the heat radiating part, a base part holding cylinder holding the base part and a linkage part linking the heat radiating part holding cylinder with the base part holding cylinder, wherein the heat radiating part holding cylinder, the base part holding cylinder and the linkage part are formed in one piece.
wherein the accommodating part is formed by the heat radiating part and the insulating part.
wherein the insulating part includes an attaching part to be attached to the heat radiating part, and
the insulating part is attached to the heat radiating part by the attaching part, thereby insulating the drive section from the heat radiating part.
wherein the attaching part is a notch provided in the insulating part, and
the insulating part includes a prevention part for preventing communication between the drive section and the heat radiating part caused by the notch.
wherein the heat radiating part comprises:
a heat radiation plate having one surface where the LED is mounted;
a fixed cylinder attached to the other surface of the heat radiation plate and provided with the accommodating part in an inside thereof; and
a heat radiation fin fixed to an outer side of the fixed cylinder.
wherein the accommodating part forms a closed space where dust entering from the outside is shut off.
wherein the accommodating part is provided close to the LED inside the heat radiating part, and
11. The lighting device according to claim 7,
12. The lighting device according to claim 7,
wherein the accommodating part forms a closed space where dust entering from the outside is shut off. Description
(*US only) This application is the national phase under 35 U.S.C. �371 of PCT International Application No. PCT/JP2008/59418 which has an International filing date of May 22, 2008 and designated the United States of America.
On the other hand, in order to achieve a higher luminance in the lighting employing LEDs, LEDs need to be accumulated at high densities. As such, when LEDs are accumulated at high densities, a problem arises that heat generated by the LEDs themselves causes damage and degradation in the LEDs themselves and the board on which the LEDs are mounted. Nevertheless, in the LED bulb described in Japanese Patent Application Laid-Open No. 2001-243807 and the LED unit with base described in Japanese Patent Application Laid-Open No. 2005-216495, design consideration for resolving such a problem caused by heat generated by the LED is insufficient.
The LED bulb and the LED unit with base described in the above-mentioned Japanese Patent Application Laid-Open No. 2001-243807 and Japanese Patent Application Laid-Open No. 2005-216495 constitute a part of the prior art concerning a lighting device employing an LED as a light source, but do not resolve the problem caused by heat generated by the LED. When an LED is to be employed as the light source of a lighting device, a large number of LEDs are necessary for ensuring a sufficient luminance. Thus, a structure is necessary for radiating the heat from the LEDs. Nevertheless, in the prior art described in the above-mentioned Japanese Patent Application Laid-Open No. 2001-243807 and Japanese Patent Application Laid-Open No. 2005-216495, design consideration for resolving such a problem caused by heat generated by the LEDs is insufficient.
The lighting device according to the present invention is a lighting device provided with an LED, a drive circuit section driving the LED, and an accommodating part accommodating the drive circuit section, comprising a heat radiating part radiating heat from the LED and/or the drive circuit section, wherein the accommodating part is tightly closed by using at least a part of the heat radiating part.
The lighting device according to the present invention is a lighting device provided with an LED, a drive circuit section driving the LED, and an accommodating part accommodating the drive circuit section, comprising a heat radiating part radiating heat from the LED and/or the drive circuit section, wherein the accommodating part is formed inside the heat radiating part such as to be close to a surface on which the LED is provided.
In the present invention, the accommodating part is formed as a combination of separate components consisting of the heat radiating part and to the insulating part. This allows the drive circuit section to be accommodated easily into the accommodating part.
The lighting device according to Embodiment 1 has: a light source module 1 in which a plurality of white LEDs 1 a are mounted; a dome-shaped light-transmitting part 4 covering the light source module 1; a heat radiating part 2 for radiating heat generated by the light source module 1; a drive circuit section 3 (drive section) provided with a plurality of drive circuit components 31, 31, 31, . . . for driving the light source module 1; a cylindrical base part 5 electrically connected to the drive circuit section 3 and connected to an external power supply; and an insulating part 6 located between the base part 5 and the heat radiating part 2.
The light source module 1 is constructed such that the plurality of LEDs (small chips) 1 a of 0.1 W are densely mounted in the center part on a rectangular ceramic board. Through holes 11 and 11 used for screwing the light source module 1 onto the heat radiating part 2 are provided at any two vertices opposite to each other in the light source module 1. The light source module 1 is screwed onto a later-described heat radiation plate 21 of the heat radiating part 2, with a heat conduction sheet (not illustrated) therebetween.
The heat radiating part 2 has a disk-shaped heat radiation plate 21. Then, the light source module 1 is screwed in the center part of one surface of the heat radiation plate 21. On the edge of the heat radiation plate 21, a flange 24 abutting against the edge of the light-transmitting part 4 is formed in the periphery. In the center part of the other surface of the heat radiation plate 21, a fixed cylinder 23 protrudes for fixing later-described heat radiation fins 22. In the inside of the fixed cylinder 23, a cavity 25 is formed that serves as an accommodating part accommodating a part of the drive circuit components 31, 31, 31, . . . of the drive circuit section 3.
Further, the heat radiating part 2 radiates not only the heat from the light source module 1 having the plurality of LEDs 1 a but also the heat from the drive circuit section 3.
Through holes 26, 26, 26, and 26 are provided in the center part of the heat radiation plate 21. Lead wires (indicated by dash-dotted lines in the FIGS. 27 and 27 connecting to each other the drive circuit section 3 and the light source module 1 accommodated in the cavity 25 penetrate the through holes 26, 26, 26, and 26. On the outer peripheral surface of the fixed cylinder 23, a plurality of heat radiation fins 22, 22, 22, . . . elongated in the axial length direction of the fixed cylinder 23 are provided in parallel to each other in the circumferential direction of the fixed cylinder 23. The heat radiation fins 22, 22, 22, . . . are fixed to the outer peripheral surface of the fixed cylinder 23. Then, one end 22A thereof is fixed to the other surface of the heat radiation plate 21. The dimension measured from the outer peripheral surface of the fixed cylinder 23 to the edge of the heat radiation fin 22 decreases from the one end 22A on the heat radiation plate 21 side toward the other end 22B. The heat radiation plate 21, the fixed cylinder 23, and the heat radiation fins 22, 22, 22, . . . are made of aluminum and formed as a unit. The insulating part 6 is attached to the other end 22B side of the heat radiation fins 22, 22, 22, . . . .
Since the heat radiating part 2 has the above-mentioned configuration, the heat generated by the light source module 1 is conducted through the heat radiation plate 21 and the heat radiation fins 22, 22, 22, . . . , and then released to outside air via the surfaces of the heat radiation fins 22, 22, 22, . . . .
Further, the light source module 1 is provided on the one end 22A side of the heat radiation fins 22, 22, 22, . . . via the heat radiation plate 21, while the insulating part 6 is provided on the other end 22B side. Further, the base part 5 is fixed to the insulating part 6. Thus, when the lighting device according to Embodiment 1 is used in a ceiling or the like, the light source module 1 at high temperatures is located under the base part 5 at low temperatures. Thus, the flow of outside air is guided in a direction from the light source module 1 to the base part 5.
The base part 5 has the cavity 51 in the inside. One-end side thereof is open, and the other-end side thereof has a bottom. Further, the base part 5 is fixed to the insulating part 6 in a state that the edge on the one-end side abuts against the holding surface 66 of the linkage part 63 of the insulating part 6. The outer peripheral surface of the base part 5 is provided with a screw groove for being screwed into an electric bulb socket. The outer peripheral surface of the base part 5 serves as a one-pole terminal 52. Further, the bottom of the base part 5 has an other-pole terminal 53 protruding such as to be insulated from the one-pole terminal 52 of the outer peripheral surface. The other-pole terminal 53 and the one-pole terminal 52 are electrically connected to the drive circuit section 3 through lead wires (indicated by dash-dotted lines in the FIGS. 54 and 54.
The drive circuit section 3 is constructed such that the plurality of drive circuit components 31, 31, 31, . . . are mounted on a rectangular circuit board 32. The circuit board 32 has: a width greater than the inner diameter of the base part holding cylinder 64 and smaller than the inner diameter of the heat radiating part holding cylinder 61; and an appropriate length that permits accommodation into the insulating part 6. A part of the drive circuit components, for example, a transistor T, is connected to the circuit board 32 through long lead wires, and hence may be arranged at a position separated from the circuit board 32.
Embodiment 1 described above has been explained for a case that a part of the drive circuit components 31, 31, 31, . . . are accommodated in the cavity 25 of the heat radiating part 2 while another part (the transistor T) is accommodated in the cavity 51 of the base part 5. However, actual implementation is not limited to this. That is, when the situation allows, the entirety may be accommodated in the cavity 25 of the heat radiating part 2. In conclusion, when the cavity 25 serving as the accommodating part for the drive circuit section 3 is tightly closed by using at least a part of the heat radiating part 2, the drive circuit section 3 is accommodated inside the heat radiating part 2, and further the heat from the drive circuit section 3 is radiated.
The lighting device according to Embodiment 2 has a heat conduction sheet 7 conducting to the heat radiating part 2 the heat generated by the driving circuit components 31, 31, 31, . . . of the drive circuit section 3. The heat conduction sheet 7 is rolled into a ring shape, and is sandwiched between the drive circuit components 31, 31, 31, . . . and the inner peripheral surface of the fixed cylinder 23 of the heat radiating part 2. That is, one side of the heat conduction sheet 7 is in contact with the drive circuit components 31, 31, 31, . . . , while the other side is in contact with the inner peripheral surface of the fixed cylinder 23 of the heat radiating part 2 via the heat radiating part holding cylinder 61 of the insulating part 6. Thus, the heat generated by the driving circuit components 31, 31, 31, . . . is conducted through the heat conduction sheet 7 and the insulating part 6 to the fixed cylinder 23 and the heat radiation fins 22, 22, 22, . . . of the heat radiating part 2, and then released to outside air via the surfaces of the heat radiation fins 22, 22, 22, . . . .
On the other hand, in Embodiments 1 and 2, the area (referred to as a heat radiation area, hereinafter) necessary for the heat radiating part 2 to radiate to outside air the heat generated by the light source module 1 varies depending on the luminance of the lighting device. That is, the amount of heat generation increases with increasing luminance, and so does the necessary heat radiation area. Thus, in the lighting device of the embodiments described above, it is preferable that the shape and the number of heat radiation fins are designed such that the heat radiating part satisfies the following conditions. For the purpose of more appropriate heat radiation and size reduction in the lighting device, such a necessary heat radiation area was calculated by simulation. The simulation was performed by using “ANSYS Simulation 9.0” under the condition of ambient temperature of 40� C. The object was to control the temperature rise into a value lower than 40� C. The detailed conditions are as follows.
An adopted condition was that a plurality of LEDs were mounted and that each LED chip having a heat generation of 8.65�106 W/m3 and a thickness of 1 mm was fixed on the front side of a rectangular aluminum board, with a heat conduction sheet (having a thermal conductivity of 5.0 W/m�K) having a thickness of 1 mm therebetween. The aluminum board had a thermal conductivity of 237 W/m�K, a thickness of 1 mm, and an area of 112 mm�112 mm. Air cooling alone by outside air (whose heat transfer coefficient was 5.8 W/m2�K) was assumed to be performed. Here, the air cooling was assumed to be performed only from the back surface of the aluminum board.
As a result of simulation performed under the conditions described above, a necessary heat radiation area, that is, a necessary back surface area of the aluminum board, of 12500 mm2 was concluded for the lighting device of type 20. Further, 25000 mm2 for type 40 and 37500 mm2 for type 60 were concluded. In other words, in order that the heat radiating part 2 performs air cooling by using outside air so as to control the temperature rise into a value lower than 40� C., the necessary area through which the heat radiation fins 22, 22, 22, . . . and the fixed cylinder 23 perform air cooling by means of contact with outside air is 12500 mm2 for type 20, 25000 mm2 for type 40, and 37500 mm2 for type 60. However, in actual implementation, consideration needs to be made for the facts that the air cooling is not performed through a flat surface but is performed through the fixed cylinder 23 and the surfaces of the heat radiation fins 22, 22, 22, . . . arranged radially in parallel to each other in the outer peripheral surface of the fixed cylinder 23 and that these components are installed in an accommodating member such as a given case and a given cover such as not to impair the external appearance of the lighting device. Thus, for example, in the case of type 20, a heat radiation area of approximately 20000 mm2 is preferable which is larger than 12500 mm2 by 60%.
FIG. 6 is a perspective view of an attachment body serving as an insulating part of the lighting device according to Embodiment 3 of the present invention. FIG. 7 is a top view of the attachment body in FIG. 6. FIG. 8 is a sectional view taken along a line VIII-VIII in FIG. 6 in a situation that an electrically active part serving as a drive circuit section (drive section) is accommodated into the attachment body in FIG. 6. FIG. 9 is a perspective view of a to-be-attached body serving as a heat radiating part attached to the attachment body in FIG. 6. FIG. 10 is an exploded perspective view of a lighting device provided with the attachment body in FIG. 6. Further, the up and down directions used in the following description are defined as follows. In a top view, the direction that the electrically active part is accommodated into the attachment body is defined as the down direction. The horizontal direction is defined as a direction perpendicular to the up and down directions.
In the figures, T1 indicates a cylindrical attachment body serving as the insulating part made of an electrical insulation material (e.g., PBT (poly butylene terephthalate)) and having a ring-shaped cross section. The attachment body T1 is constructed from: an accommodating part 1003 serving as a heat radiating part holding cylinder accommodating an electrically active part 1002 serving as a drive circuit section (drive section) such as power supply components; and a base holding part 1004 holding a base 1042 for being connected to a socket for electric bulb.
The prevention part 1034 is formed integrally with the accommodating part 1003 such as to prevent a non-insulation state (communication) between the electrically active part 1002 and the to-be-attached body 1005 caused by the notch 1033. The gap α between the prevention part 1034 and the attaching part 1032 is formed such as to be greater than the protrusion length of the hook 1038 provided in the attaching part 1032.
As illustrated in FIG. 8, the electrically active part 1002 is constructed such that a plurality of power supply components 1022, 1022, 1022, . . . are mounted on a rectangular circuit board 1021. The electrically active part 1002 has a width and a length allowed to be accommodated in the accommodating part 1003.
Further, on the outer peripheral surface of the holding cylinder 1054, a plurality of the heat radiation fins 1053, 1053, 1053, . . . elongated in the up and down directions of the holding cylinder 1054 are provided in parallel to each other in the circumferential direction of the holding cylinder 1054. The dimension measured from the outer peripheral surface of the holding cylinder 1054 to the edge of the heat radiation fin 1053 decreases from the one end on the heat radiation plate 1051 side toward the other end.
The light source module 1061 is provided with screw holes 1061 a for being screwed onto the heat radiation plate 1051. The light source module 1061 is screwed onto the heat radiation plate 1051 of the to-be-attached body 1005, with a heat conduction sheet (not illustrated) therebetween. Further, the reflection part 1062 is fitted in the light source module 1061 so as to be held on the heat radiation plate 1051. Then, the light-transmitting part 1063 is caused to abut against the flange 1052 so as to be held on the heat radiation plate 1051. As a result, the light source module 1061 is protected from the outside by the light-transmitting part 1063, and further transmits light. Further, by virtue of the reflection part 1062 and the light-transmitting part 1063, light emitted from the light source module 1061 is efficiently emitted to the outside.
Then, when the attachment body T2 holding the electrically active part 1002 inside the accommodating part 1003 is inserted into the to-be-attached body 1005, the attaching part 1071 is pressed by the inner wall of the holding cylinder 1054. The attaching part 1071 has elasticity. Thus, as a result of the pressing, the attaching part 1071 is bent in the direction of the electrically active part 1002. Then, the hook 1038 of the attaching part 1071 having been bent is accommodated into the gap β. Then, the bend of the attaching part 1071 is released so that the hook 1038 locks to the step part 1056. As a result, the attachment body T2 is attached to and held by the to-be-attached body 1005, and further insulation is ensured between the electrically active part 1002 and the to-be-attached body 1005.
The lighting device according to Embodiment 6 has the shape of an electric bulb and has: a light source part 2001 provided with a light source, for example, composed of a plurality of white LEDs 2011, 2011, 2011, . . . ; a cover part 2004 serving as a dome-shaped light-transmitting part covering the light source part 2001; a heat radiating part 2002 for radiating the heat generated by the light source part 2001; a circuit part 2007 composed of a drive circuit section 2003 (drive section) for driving the light source and a circuit accommodating part 2006 accommodating the drive circuit section 2003; and a base part 2005 electrically connected to the drive circuit section 2003.
The light source part 2001 has an LED module 2013 serving as a light source module constructed from the plurality of white LEDs 2011, 2011, 2011, . . . and a disk-shaped LED board 2012 having one surface where the plurality of white LEDs 2011, 2011, 2011, . . . are soldered. The LED board 2012 is mounted on a disk-shaped base plate 2014 having a larger diameter than the LED board 2012 by screwing or the like, with an electrical insulation material (not illustrated) therebetween. As a result, the other surface of the LED board 2012 goes into thermally close contact with one surface on the cover part 2004 side of the base plate 2014. On the other surface of the base plate 2014, a cylindrical holding column 2017 protrudes for holding the LED module 2013. The end part 2017 b on the base part 2005 side of the holding column 2017 is screwed into and held by the circuit accommodating part 2006 in a removable manner. On the edge of the base plate 2014, a male screw part 2015 for screwing the cover part 2004 in a removable manner is provided. Further, in the surface on the base part 2005 side of the holding column 2017, a cylindrical first pin plug 2016 connected to the LED board 2012 protrudes so as to permit electric attaching and detaching between the drive circuit section 2003 and the light source part 2001. In the outer peripheral surface of the middle part 2017 a of the holding column 2017, a male screw 2017 c is provided. Then, the male screw 2017 c constitutes a second screwing mechanism with the inner holding cylinder 2022 of a later-described heat radiating part 2002, so that the heat radiating part 2002 is screwed around the holding column 2017 in a removable manner. On the other hand, the end part 2017 b on the base part 2005 side of the holding column 2017 has a reduced diameter in comparison with the middle part 2017 a. A male screw 2017 d is provided in the outer peripheral surface of the end part 2017 b on the base part 2005 side. The male screw 2017 d constitutes a third screwing mechanism with the screw hole 2062 of a later-described circuit accommodating part 2006, so that the holding column 2017 is screwed into the circuit accommodating part 2006 in a removable manner. Further, in association with attaching and detaching between the circuit accommodating part 2006 and the holding column 2017, attaching and detaching between the circuit part 2007 and the holding column 2017 are performed. The base plate 2014 and the holding column 2017 are made of aluminum, and formed as a unit. Further, the LED module 2013, the base plate 2014, and the holding column 2017 are provided concentrically.
The heat radiating part 2002 has: a cylindrical inner holding cylinder 2022 having a female screw 2221 provided inside for being screwed around the holding column 2017; a corrugated heat radiation fin 2021 provided in the outer peripheral surface of the inner holding cylinder 2022; and an outer holding cylinder 2023 holding the heat radiation fin 2021 from the outer side. The corrugated heat radiation fin 2021 has an annular shape, and is in a radial arrangement around the axial center of the inner holding cylinder 2022. Thus, the flow of outside air is guided in a direction from the light source part 2001 at high temperatures to the base part 2005 at low temperatures, that is, in an axial direction of the inner holding cylinder 2022. The inner holding cylinder 2022, the heat radiation fin 2021, and the outer holding cylinder 2023 are all made of aluminum, and provided concentrically. The heat generated by the LED module 2013 is conducted through the base plate 2014, the holding column 2017, the inner holding cylinder 2022, and the heat radiation fin 2021, in this order, and then released through the heat radiation fin 2021 to outside air via the surface of the heat radiation fin 2021. By virtue of the second screwing mechanism constructed from the female screw 2221 provided inside the inner holding cylinder 2022 of the heat radiating part 2002 and the male screw 2017 c provided in the outer peripheral surface of the middle part 2017 a of the holding column 2017, the heat radiating part 2002 is fixed to the holding column 2017 in a removable manner.
The circuit accommodating part 2006 provided continuously to the one-end side of the base part 2005 has an approximately cylindrical shape whose diameter decreases from the end part on the base part 2005 side toward the tip side. The circuit accommodating part 2006 accommodates the drive circuit section 2003 having: a drive circuit 2031 composed of various kinds of circuit components for driving the LED module 2013; and a circuit board 2032 having one surface where the drive circuit 2031 is soldered. The circuit accommodating part 2006 has a disk part 2063 in the end part on the light source part 2001 side. In the center part of the disk part 2063, a screw hole (a female screw) 2062 into which the male screw 2017 d of the end part 2017 b on the base part 2005 side of the holding column 2017 is to be screwed is provided. By virtue of the third screwing mechanism constructed from the male screw 2017 d of the end part 2017 b on the base part 2005 side and the screw hole 2062, the circuit accommodating part 2006 is attached to the holding column 2017 in a removable manner. Further, the circuit accommodating part 2006 is divided into two portions consisting of: a cylindrical part 2006A on the light source part 2001 side and a diameter decrease part 2006B on the base part 2005 side. A female screw 2061A is provided inside the edge of the cylindrical part 2006A. On the outer side of the diameter decrease part 2006B, a male screw 2061B to be screwed around the female screw 2061A is provided. The female screw 2061A and the male screw 2061B constitute a fourth screwing mechanism. The cylindrical part 2006A and the diameter decrease part 2006B are screwed with each other in a removable manner by virtue of the fourth screwing mechanism.
FIG. 18 is an electrical diagram of a main part of the lighting device according to Embodiment 6 of the present invention. The drive circuit section 2003 has one end electrically connected to the LED module 2013, and the other end electrically connected through a current fuse 2005 a to the base part 2005. The drive circuit section 2003 and the LED module 2013 are electrically connected to each other through the first pin plug 2016 and a later-described first receptacle 2003 g. Further, the drive circuit section 2003 and the base part 2005 are electrically connected to each other through the second pin plug 2051 and a later-described second receptacle 2003 h. The current fuse 2005 a provided between the drive circuit section 2003 and the base part 2005 blows out rapidly in case of over-current so as to shut off the circuit and avoid smoke generation or ignition.
The drive circuit section 2003 has: a thermal fuse (or a protector that repeats make and break, or the like) 2003 a that blows out and shuts off the power supply when heat generation causes a temperature higher than a given value; a varistor 2003 b who absorbing an overvoltage; a diode bridge 2003 c for performing full-wave rectification on a commercial AC voltage; a smoothing capacitor (an electrolytic capacitor) 2003 d for converting the current (a pulsating current) from the diode bridge 2003 c into a smoother DC; a DC-DC converter circuit 2003 e directly connectable to a commercial AC power supply composed of a power supply module (such as an HIC (Hybrid Integrated Circuit)) for reducing the smoothed high DC voltage into a low DC voltage (e.g., DC 12 V) for driving the LED; a capacitor (a ceramic capacitor) 2003 f for detecting the voltage of the LED module 2013; a voltage detecting circuit composed of a series circuit of a resistor R2; a first receptacle 2003 g mechanically and electrically connected to the first pin plug 2016 of the LED module 2013; a second receptacle 2003 h mechanically and electrically connected to the second pin plug 2051 of the base part 2005; a resistor R1 for voltage stabilization; and an output current setting resistor R2.
Embodiment 6 of the present invention has been described for a case that the cover part 2004 is opaque white. However, actual implementation is not limited to this. For example, when a colored cover part 2004 is employed, light of various kinds of color is available which is not realized by the white LEDs 2011, 2011, 2011, . . . alone in the light source.
Embodiment 6 of the present invention has been described for a case that the heat radiating part 2002 is screwed around the outer peripheral surface of the middle part 2017 a of the holding column 2017 of the light source part 2001 by the second screwing mechanism and the end part 2017 b on the base part 2005 side of the holding column 2017 is screwed into the circuit accommodating part 2006 by the third screwing mechanism so that the heat radiating part 2002 and the light source part 2001 are in a removable manner by virtue of the screwing mechanisms. However, actual implementation is not limited to this. That is, it is sufficient that the holding column 2017 (the light source part 2001) and the heat radiating part 2002 are constructed to be removable, respectively. For example, an engagement mechanism may be constructed from: an engagement hole provided in the holding column 2017; and an engagement piece provided in the heat radiating part 2002 and engaging with the engagement hole. Then, by virtue of this, the holding column 2017 and the heat radiating part 2002 may be removable. Alternatively, an engagement hole may be provided in the heat radiating part 2002, while an engagement piece may be provided in the holding column 2017. Further, the description has been given above for a case that the heat radiating part 2002 has the outer holding cylinder 2023. However, the outer holding cylinder 2023 may be omitted. Further, the heat radiation fin 2021 may be constructed to be removable independently. In each case, regardless of the orientation of installation of the lighting device according to Embodiment 6 of the present invention, a satisfactory heat radiation efficiency is maintained.
The heat radiating part 2002 of the lighting device according to Embodiment 8 of the present invention has: a cylindrical inner holding cylinder 2022 having a female screw 2221 provided inside for being screwed around the holding column 2017; and a porous heat radiation block 2021B fixed to the to inner holding cylinder 2022. The heat radiation block 2021B has a cylindrical shape having a diameter approximately equal to that of the base plate 2014. The center part of the heat radiation block 2021B is provided with a through hole having an inner diameter that is approximately equal to the outer diameter of the inner holding cylinder 2022 and that allows the inner holding cylinder 2022 to penetrate. In a state that the inner holding cylinder 2022 is inserted into the through hole, the inner surface of the through hole of the heat radiation block 2021B is fixed to the outer peripheral surface of the inner holding cylinder 2022. The inner holding cylinder 2022 and the heat radiation block 2021B are both made of aluminum.
When a compact (metal powder) composed of metal powder having the form of so-called heteromorphic powder or spherical powder is heat-treated at a temperature near the melting point of the metal, a liquid phase is formed only in the particle surfaces of the metal powder. Thus, so-called necking is formed in the contacting parts between metal particles. In the remaining parts of the contacting parts, so-called inter-metal-particles space is formed. Thus, in the heat-treated metal powder (sintered metal), durability (strength) is improved by the necking, and further a porous material is obtained that contains a large number of open pores and closed pores formed by the inter-metal-particles space. The heat radiation block 2021B made of such porous sintered metal has a sufficient heat radiation area.
The heat radiating part 2002 has: a cylindrical to-be-held cylinder 2027 whose inside is provided with a female screw 2271 for being screwed into the male screw 2065 of the circuit accommodating part 2006; link plates 2026, 2026, 2026, . . . provided in parallel to each other in the circumferential direction of the to-be-held cylinder 2027; and a heat radiation shade 2025 having a truncated conical shape linked to the to-be-held cylinder 2027 via the link plates 2026, 2026, 2026, . . . . The female screw 2271 of the to-be-held cylinder 2027 and the male screw 2065 of the circuit accommodating part 2006 constitute a sixth screwing mechanism. Then, the heat radiating part 2002 is fixed to the circuit accommodating part 2006 in a removable manner by virtue of the sixth screwing mechanism.
On the outer peripheral surface of the to-be-held cylinder 2027, eight of the link plates 2026, 2026, 2026, . . . are arranged at equal intervals with air passages C therebetween. The heat radiation shade 2025 is arranged so as to surround the cover part 2004, the light source part 2001, and the circuit accommodating part 2006, and is linked to the link plates 2026, 2026, 2026, . . . in the inside of one end part. Further, the heat radiation shade 2025 has a diameter increasing with departing from the to-be-held cylinder 2027. The to-be-held cylinder 2027, the link plates 2026, 2026, 2026, . . . , and the heat radiation shade 2025 are all made of aluminum, and formed as a unit.
In Embodiment 9, the heat generated by the LED module 2013 is conducted through the base plate 2014, the holding column 2017, the circuit accommodating part side wall 2067, the to-be-held cylinder 2027, the link plates 2026, 2026, 2026, . . . , and the heat radiation shade 2025, in this order. At that time, the heat generated by the LED module 2013 is released to outside air by outside air flowing through the inside of the heat radiation shade 2025 via the air passages C and outside air flowing through the outer side of the heat radiation shade 2025. Further, the heat radiation shade 2025 has a diameter increasing with departing from the to-be-held cylinder 2027, and also has the function of adjusting the angle of irradiation.
Embodiment 9 has been described for a case that the to-be-held cylinder 2027, the link plates 2026, 2026, 2026, . . . , and the heat radiation shade 2025 are made of aluminum. However, actual implementation is not limited to this. For example, employable materials include: metals such as bronze and stainless steel having a satisfactory heat radiation property; and raw materials such as ceramics and resins having a satisfactory thermal conductivity.
The lighting device according to Embodiment 10 has a drive circuit section 2003 connected to the LED module 2013 via the first pin plug 2016. The lighting device further has: a control section 2070 controlling the drive circuit section 2003; a temperature detection section 2009 for detecting the temperature of the LED module 2013; and a lighting control section 2008 turning ON or OFF the white LEDs 2011, 2011, 2011, . . . of the LED module 2013 on the basis of the detection result from the temperature detection section 2009.
When the plurality of white LEDs 2011, 2011, 2011, . . . are used, a large amount of heat is generated by the LED module 2013 and hence the temperature of the LED module 2013 reaches 100� C. or more in some cases. Further, it is assumed that component change is performed by a user with bare hand. Thus, for the purpose of preventing a situation that the user suffers from burns at the time of component change during the usage, the temperature of a part (e.g., the cover part 2004 and the heat radiating part 2002) going into contact with the user's bare hand need to be controlled. Further, if LEDs were kept operating at high temperatures, the lifetime of the LEDs would be reduced. With taking such situations into consideration, it is preferable that turning ON/OFF of the white LEDs 2011, 2011, 2011, . . . is controlled such that the temperature of the LED module 2013 does not exceed 90� C. (a safety limit temperature).
The temperature detection section 2009 is provided on the LED board 2012, and detects the temperature of the LED module 2013. For example, when the detection result from the temperature detection section 2009 is at or higher than the safety limit temperature, the control section 2070 instructs the lighting control section 2008 to turn OFF the white LEDs 2011, 2011, 2011, . . . of the LED module 2013. Thus, the lighting control section 2008 turns OFF the white LEDs 2011, 2011, 2011, . . . . After that, when the temperature of the LED module 2013 goes lower and hence the detection result from the temperature detection section 2009 becomes at or lower than the safety limit temperature, the control section 2070 instructs the lighting control section 2008 to turn ON the white LEDs 2011, 2011, 2011, . . . . Thus, the lighting control section 2008 turns ON the white LEDs 2011, 2011, 2011, . . . .
Embodiment 10 of the present invention has been described for a case that the safety limit temperature is 90� C. However, actual implementation is not limited to this. That is, the safety limit temperature may be set up variably depending on the necessity.
Embodiment 10 of the present invention has been described for a case that the lighting control section 2008 is provided and when the temperature of the LED module 2013 is at or higher the safety limit temperature, the white LEDs 2011, 2011, 2011, . . . are turned OFF. However, actual implementation is not limited to this. For example, current control means for controlling the current supplied to the white LEDs 2011, 2011, 2011, . . . of the LED module 2013 may be provided and when the temperature of the LED module 2013 is at or higher the safety limit temperature, the current supplied to the white LEDs 2011, 2011, 2011, . . . may be reduced.
The lighting device 2100 according to Embodiment 11 has a drive circuit section 2003 connected to the LED module 2013 via the first pin plug 2016. The lighting device 2100 further has: a control section 2070 controlling the drive circuit section 2003; a current control section 2018 increasing/reducing and turning ON/OFF the current to be supplied to the white LEDs 2011, 2011, 2011, . . . of the LED module 2013 in response to an instruction from the control section 2070; and a receiving section 2010 receiving a signal from the remote controller A.
When a user operates the remote controller A, the luminance and the ON/OFF of the lighting device 2100 is operated by remote control. For example, when the user operates the remote controller A so that a signal of instruction of increasing the luminance is transmitted from the remote controller A, the receiving section 2010 receives the signal. On the basis of the signal received by the receiving section 2010, the control section 2070 instructs the current control section 2018 to control (increase) the current. Then, in response to the instruction from the control section 2070, the current control section 2018 increases the current supplied to the white LEDs 2011, 2011, 2011, . . . .
As such, Embodiment 11 of the present invention has been described for a case that the current control section 2018 is provided and on the basis of the signal from the remote controller A, the current control section 2018 controls the current supplied to the white LEDs 2011, 2011, 2011, . . . so as to adjust the luminance and the ON/OFF of the lighting device 2100. However, actual implementation is not limited to this. For example, the configuration may be such that ON/OFF control is permitted for each of the white LEDs 2011, 2011, 2011, . . . . Then, ON/OFF of each of the white LEDs 2011, 2011, 2011, . . . may be controlled independently so that the luminance and the ON/OFF of the lighting device 2100 may be adjusted.
Here, the embodiments disclosed in the present specification should be understood as illustrative and not restrictive at all points. That is, in the present invention, various kinds of modifications and applications may be employed without departing from the range of spirit of the present invention.
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F21Y2101/00, F21Y2105/10, F21V29/508, F21V29/89, F21V29/773, F21V29/767, F21V3/00, F21V29/004, H05B33/0803, F21V23/006, F21V23/002, F21V17/12, F21V17/14, F21V17/16, F21V19/0055European ClassificationF21K9/00, F21V29/00C2, F21V29/22B2D2, F21V23/02, H05B33/08D, F21V29/22B2F4Legal EventsDateCodeEventDescriptionDec 1, 2009ASAssignmentOwner name: SHARP KABUSHIKI KAISHA,JAPANFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:YAMAMOTO, SHOJI;NAKAGAWA, HIROYASU;SAKAIDA, SHINYA;AND OTHERS;REEL/FRAME:023588/0574Effective date: 20091107Owner name: SHARP KABUSHIKI KAISHA, JAPANFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:YAMAMOTO, SHOJI;NAKAGAWA, HIROYASU;SAKAIDA, SHINYA;AND OTHERS;REEL/FRAME:023588/0574Effective date: 20091107Jan 12, 2016FPAYFee paymentYear of fee payment: 4RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services