JP2009272263A - Led lamp - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an LED lamp used in place of an annular fluorescent lamp at a lower cost. <P>SOLUTION: The LED lamp A includes a substrate 10 and a plurality of LED modules 30 mounted on the surface of the substrate 10. The substrate 10 is an annular substrate formed by combining together a plurality of curved substrates 11 of circular arcs. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an LED lamp that uses a light emitting diode (hereinafter referred to as LED) as a light source and can be used as an alternative to a fluorescent lamp.

  Fluorescent lamps used for general fluorescent lighting fixtures have problems such as short lifetime, containing harmful substances such as mercury and lead, weakness in low-temperature operation, and easy access to insects. Has been devised. The general fluorescent lamp illuminator is an illuminator widely used mainly for indoor general illumination. For example, in Japan, a commercial 100V or 200V power supply is used, and a straight tube fluorescent lamp defined in JIS C7617 is used. This refers to a luminaire to which a lamp or an annular fluorescent lamp defined in JIS C7618 is attached.

  FIG. 3 shows an example of a conventional LED lamp in a cross-sectional view (see, for example, Patent Document 1). The LED lamp X shown in the figure includes a long rectangular substrate 91, a plurality of LEDs 92 mounted on the substrate 91, a tube 93 that accommodates the substrate 91, and a terminal 94. On the surface of the substrate 91, a wiring pattern (not shown) connected to the plurality of LEDs 92 and the terminals 94 and a resin protective layer that covers and protects the wiring pattern are formed. This LED lamp X is configured such that a plurality of LEDs 92 can emit light by fitting a terminal 94 into an insertion port of a socket of a general fluorescent lamp lighting fixture. This LED lamp X can be used as an alternative to a straight tube fluorescent lamp.

  On the other hand, in order to manufacture an annular LED lamp that can be used as an alternative to the annular fluorescent lamp, it is necessary to prepare an annular substrate. However, since the annular substrate is formed, for example, by cutting out the central portion of the circular substrate, there is a problem that the material is wasted and the manufacturing cost is increased. For this reason, it has been difficult to produce a practical LED lamp that can be used as an alternative to the ring fluorescent lamp.

Japanese Utility Model Publication No. 6-54103

  The present invention has been conceived under the circumstances described above, and an object thereof is to provide an LED lamp that can be used as an alternative to a ring-shaped fluorescent lamp at a lower cost.

  The LED lamp provided by the present invention is an LED lamp comprising a substrate and a plurality of LED modules mounted on the surface of the substrate, wherein the substrate is a plurality of curved substrates formed in an arc shape. It is the cyclic | annular board | substrate formed combining these, It is characterized by the above-mentioned.

  According to such a configuration, since the annular substrate is formed by combining a plurality of curved substrates, waste of the substrate material can be suppressed as compared with the case where the annular single substrate is used. For this reason, the LED lamp can be manufactured at a relatively low cost, and can be used as an alternative to the ring-shaped fluorescent lamp.

  In a preferred embodiment of the present invention, the plurality of curved substrates have the same shape. According to such a configuration, the annular substrate can be manufactured by manufacturing one type of curved substrate, and the LED lamp can be manufactured efficiently.

  In a preferred embodiment of the present invention, the plurality of LED modules are arranged at regular intervals along the circumferential direction of the annular substrate, and the regular intervals from the end portions of the curved substrates in the circumferential direction. One of the plurality of LED modules is disposed at a position separated by a half length. According to such a structure, since the plurality of LED modules are evenly arranged along the circumferential direction of the annular substrate, illumination without unevenness can be provided.

  In a preferred embodiment of the present invention, a heat radiating member is attached to the back surface of the annular substrate, and the heat radiating member has a plurality of plate portions arranged in parallel along the radial direction of the annular substrate. . According to such a configuration, since the heat generated by the LED module is released to the outside air by the heat radiating member, the temperature of the LED lamp does not rise excessively and can provide stable illumination.

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

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

  FIG. 1 is a plan view showing an example of an LED lamp according to the present invention, and FIG. 2 is a sectional view taken along line II-II in FIG. The LED lamp A shown in FIGS. 1 and 2 includes an annular substrate 10, a heat radiating member 20, an LED module 30, a base 40, and a diffusion plate 50. In FIG. 1, the diffusion plate 50 is omitted. The LED lamp A is used by being attached to a general fluorescent lamp luminaire as an alternative to a fluorescent lamp, for example.

  The annular substrate 10 is formed by annularly combining four curved substrates 11 having the same shape along the circumferential direction. The curved substrate 11 is formed in an arc shape. An angle t formed by a straight line L1 passing through one end in the circumferential direction of the curved substrate 11 and a straight line L2 passing through the other end is, for example, 85.8 °. The curved substrate 11 is an aluminum substrate, and includes an insulating layer 12 stacked on the surface, and wiring patterns 13 and 14 stacked on the insulating layer 12.

  The heat radiating member 20 is formed, for example, in an annular shape in plan view from Al, and includes a bonding surface 21 to which the diffusion plate 50 is bonded, a recessed fitting portion 22 that houses the annular substrate 10, and a plurality of surfaces for increasing the surface area. A plate portion 23 is provided. The plurality of plate portions 23 are formed so as to be parallel to each other, and are arranged along the radial direction of the heat dissipation member 20.

  The LED module 30 includes an LED 31, metal leads 32 and 33 that are spaced apart from each other, a wire 34, and a resin package 35. A plurality of LED modules 30 are arranged so as to be arranged at a constant interval p along the circumferential direction of each curved substrate 11. Among the LED modules 30 mounted on each curved substrate 11, the LED modules 30 positioned at both ends in the circumferential direction are half the distance between the LED modules 30 along the circumferential direction from both circumferential ends of each curved substrate 11. Are provided at positions separated by a length p / 2. According to such an arrangement, the plurality of LED modules 30 mounted on the annular substrate 10 in which the four curved substrates 11 are combined are arranged at equal intervals along the circumferential direction of the annular substrate 10.

  The LED 31 has, for example, a structure in which an n-type semiconductor layer and a p-type semiconductor layer and an active layer sandwiched between them are stacked. For example, when the LED 31 is made of a GaN-based semiconductor, it can emit blue light. The LED 31 is die-bonded to the lead 32. Further, the upper surface of the LED 31 is connected to the lead 33 via the wire 34. The lead 32 is connected and fixed to the wiring pattern 13, and the lead 33 is connected and fixed to the wiring pattern 14.

  The resin package 35 is for protecting the LED 31 and the wire 34. The resin package 35 is formed by using, for example, a silicon resin that has translucency with respect to the light from the LED 31. In addition, if a fluorescent material that emits yellow light when excited by blue light is mixed in the resin package 35, white light can be emitted from the LED module 30.

  The base 40 is formed so as to connect both ends of the annular substrate 10, and holds a pair of terminals 41. Each of the pair of terminals 41 includes two pins and is electrically connected to either the wiring pattern 13 or the wiring pattern 14. By fitting the pair of terminals 41 into the sockets of the general fluorescent lamp lighting fixture, power can be supplied to the plurality of LED modules 30 and the LEDs 31 can emit light.

  The diffusing plate 50 is formed in an annular shape in plan view with a light diffusing material, and is installed so as to diffuse the light emitted from the LED module 30. In this embodiment, the diffusion plate 50 has a semicircular cross section.

  Next, the operation of the LED lamp A will be described.

  According to the present embodiment, since the annular substrate 10 is configured by combining the four curved substrates 11, the LED lamp A can suppress waste of the substrate material compared to the case where the annular single substrate is used. . For this reason, the LED lamp A can be manufactured at a relatively low cost, and can be used as an alternative to the annular fluorescent lamp. When the LED lamp A is used in place of the fluorescent lamp, it is possible to reduce maintenance work and power consumption.

  Furthermore, according to this embodiment, since the four curved substrates 11 constituting the annular substrate 10 have the same shape, the annular substrate 10 can be manufactured by manufacturing one kind of the curved substrate 11. For this reason, the manufacturing cost of the annular substrate 10 can be further suppressed.

  Furthermore, according to this embodiment, since the LED modules 30 are arranged at equal intervals along the circumferential direction of the annular substrate 10, unevenness in the light emitted from the LED lamp A is less likely to occur.

  Furthermore, according to this embodiment, the LED lamp A has the heat radiating member 20 and can preferably release the heat generated from the plurality of LED modules 30 to the outside air. For this reason, the LED lamp A does not cause a malfunction due to an increase in temperature, and can stably provide illumination.

  The LED lamp according to the present invention is not limited to the above-described embodiment. The specific configuration of each part of the LED lamp according to the present invention can be varied in design in various ways. In the above embodiment, the cross section of the diffusion plate 50 is a semi-annular shape, but the cross section of the diffusion plate 50 may have any shape as long as a part of the ring is missing.

  Moreover, in the said embodiment, although the cyclic | annular board | substrate 10 consists of the four curved board | substrates 11, the number of the curved board | substrates which comprise a cyclic | annular board | substrate can be set freely.

It is a top view which shows an example of the LED lamp concerning this invention. It is sectional drawing which follows the II-II line of FIG. It is sectional drawing which shows an example of the conventional LED lamp.

Explanation of symbols

A LED lamp 10 Annular substrate 11 Curved substrate 12 Insulating layers 13, 14 Wiring pattern 20 Heat radiation member 21 Adhesive surface 22 Recessed fitting portion 23 Plate portion 30 LED module 31 LED
32, 33 Lead 34 Wire 35 Resin package 40 Base 41 Terminal 50 Diffusion plate

Claims (4)

A substrate,
A plurality of LED modules mounted on the surface of the substrate;
An LED lamp comprising:
The LED lamp according to claim 1, wherein the substrate is an annular substrate formed by combining a plurality of curved substrates formed in an arc shape.   The LED lamp according to claim 1, wherein the plurality of curved substrates have the same shape.   The plurality of LED modules are arranged at regular intervals along the circumferential direction of the annular substrate, and are separated from the end portions of the curved substrates in the circumferential direction by a length that is half the regular interval. The LED lamp according to claim 2, wherein one of the plurality of LED modules is disposed.   The heat radiating member is attached to the back surface of the annular substrate, and the heat radiating member has a plurality of plate portions arranged in parallel along the radial direction of the annular substrate. LED lamp of description.

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