JP2011175916A - Luminaire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a luminaire capable of irradiating the light from the almost whole of a glove and capable of restricting a temperature rise of an LED. <P>SOLUTION: This luminaire 1 includes: a cylindrical support 2 having an opening part 2a; a globe receiver member 3 fitted to the support 2 by inserting from the opening part 2a and having an engagement part 32 on the inner peripheral side thereof; a translucent glove 4 having an engagement part 41 to be engaged with the engagement part 32 of the glove receiver member 3 on the outer peripheral side thereof and including a light transmitting part 42 extended from the engagement part 41; and light source parts 20 and 50 having a board 21, on which a LED 22 is mounted, and arranged so that the board 21 is positioned at 1/3 or less of the whole length of the light transmitting part 41 of the glove 4 from the engagement part 41 side. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a lighting fixture that is suitable for use as a pole-type lighting fixture such as a garden lamp in an exterior and uses an LED (light emitting diode) as a light source.

  Conventionally, in this type of pole-type lighting fixture, a glove constructed of milky glass that is erected by embedding the pole in the ground, mounting an incandescent lamp on the top of the pole, and allowing this lamp to transmit light while diffusing There is known a lighting fixture covered with (see, for example, Patent Document 1).

  As shown also in this patent document 1, the lamp | ramp is arrange | positioned and comprised at the center part of the glove | globe so that the light radiate | emitted from the lamp | ramp may be irradiated from the whole glove | globe and the glove | globe whole may shine brightly. .

  By the way, recently, LEDs have been used as a light source for illumination. For example, a light bulb-shaped LED lamp capable of realizing energy saving and long life has been put on the market. Such LED lamps are incorporated into lighting fixtures, and various lighting fixtures that take advantage of LED lamps are expected to appear.

  As shown in FIG. 7, the bulb-shaped LED lamp 20 has the same size and shape as the incandescent bulb, and has an LED 22 mounted on a substrate 21 inside. The LED lamp 20 includes a main body 23, a base 24, and a cover 25 that covers the LED 22 and is attached to the main body 23.

  The main body 23 is made of, for example, a metal material such as aluminum having good thermal conductivity, and a plurality of radiating fins are integrally formed on the outer peripheral surface. The base 24 is of an E26 type, for example, and is electrically connected to a lighting device accommodated in the main body 23 by wiring, and includes a cylindrical shell that is screwed into a lamp socket of a lighting fixture. Further, the cover 26 is formed in a spherical shape from glass or synthetic resin having light diffusibility.

JP 2008-171591 A

  In the LED lamp 20 configured as described above, the LED 22 emits light when energized, and light is emitted through the cover 26. However, the light emitted from the LED 22 is highly directional, as shown in the figure. The light is irradiated mainly from the surface of the substrate 21 to the front side. Therefore, when the LED lamp 20 is mounted on a lighting fixture as shown in Patent Document 1, since the LED lamp 20 is disposed at the center of the globe of the lighting fixture, the front half of the globe shines brightly. The half on the back side appears as a dark shadow.

  On the other hand, it is known that, when the temperature rises, the LED brings about changes in various characteristics such as a decrease in light output and shortens the lifetime. Also, an allowable junction temperature is specified. Therefore, in a lighting fixture using LEDs as light sources, it is necessary to consider various characteristics and lifetimes and to suppress the temperature rise of the LEDs so as not to exceed the junction temperature.

  This invention is made | formed in view of the above subjects, and it aims at providing the lighting fixture which can suppress the temperature rise of LED while enabling it to irradiate light from the substantially whole globe.

  The lighting fixture according to claim 1 is a cylindrical column having an opening, a globe receiving member that is inserted into and attached to the column from the opening, and has an engaging portion on the inner peripheral side, and the globe receiving member Having an engaging portion engaged with the engaging portion of the outer peripheral side, a translucent globe having a light transmitting portion extending from the engaging portion, and a substrate on which the LED is mounted, And a light source portion disposed so that the position of the substrate is 1/3 or less from the engagement portion side in the entire length of the light transmission portion of the globe.

  The lighting fixture is preferably a pole-type lighting fixture used for exterior lighting. For example, a light bulb-shaped LED lamp or LED module is applied to the light source unit. Any device having a substrate on which an LED is mounted is applicable. Further, when an LED lamp is used as the light source unit, the type of the cap is not particularly limited.

As a method for mounting the LED on the substrate, a method in which the LED chip is directly mounted on the substrate or a method in which the LED package is mounted by surface mounting can be applied, and the method is not particularly limited. The globe preferably has light diffusibility, but is not essential. What is necessary is just to have translucency.
According to the configuration of the present invention, almost the entire globe is brightly lit, and the temperature rise of the LED can be suppressed.

  ADVANTAGE OF THE INVENTION According to this invention, while being able to irradiate light from the substantially whole globe, the lighting fixture which can suppress the temperature rise of LED can be provided.

It is a perspective view which shows the lighting fixture which concerns on the 1st Embodiment of this invention. It is a perspective view which decomposes | disassembles and shows the same lighting fixture. It is sectional drawing of the lighting fixture. It is sectional drawing of the lighting fixture which shows the comparative example 1. FIG. It is sectional drawing of the lighting fixture which shows the comparative example 2. FIG. It is sectional drawing which shows the lighting fixture which concerns on the 2nd Embodiment of this invention. It is a front view which shows the light bulb-shaped LED lamp which is a light source part.

  A lighting apparatus according to a first embodiment of the present invention will be described with reference to FIGS. FIGS. 1 to 3 show a lighting fixture of the present embodiment, and FIGS. 4 and 5 show a lighting fixture of a comparative example. In the drawings, the same or corresponding parts are denoted by the same reference numerals, and redundant description is omitted.

  As shown in FIGS. 1 to 3, the lighting fixture 1 is a pole-type lighting fixture used on the exterior, and is used standing on the ground. The luminaire 1 includes a cylindrical column 2, a globe receiving member 3, the light bulb-shaped LED lamp 20 as a light source, a translucent globe 4, and a spike member 5 (FIGS. 2 to 3 after FIG. 1). 6 is omitted). The spike member 5 is formed from a stainless steel plate material, and is used to stand the lighting device 1 by being embedded in the ground.

  The support | pillar 2 is formed in the pipe shape made from aluminum, and has the opening part 2a in the upper end part. In this embodiment, the column 2 has a length of about 150 mm to 170 mm, but a longer column may be used. In that case, the column 2 is erected by being embedded in the ground.

  As representatively shown in FIG. 3, the globe receiving member 3 constitutes the main body of the lighting fixture 1 and is formed into a bottomed cylindrical shape by die casting of an aluminum alloy. A female thread portion 32 is formed as an engaging portion on the inner peripheral side in the vicinity thereof. A socket 6 to which the LED lamp 20 is attached is attached to the bottom wall.

  The globe receiving member 3 is inserted from the opening 2a of the support column 2, and the flange portion 31 is placed on the edge of the opening 2a of the support column 2, and is attached to the support column 2 by a mounting screw (not shown). The globe receiving member 3 has an outer diameter that is smaller than the inner diameter of the column 2 in order to facilitate insertion into the column 2. A gap is created.

  The translucent globe 4 is made of a milky white glass material having light diffusibility, and, like the support column 2, has a substantially cylindrical shape and covers the LED lamp 20 which is a light source part. . The lower end side of the globe 4 is reduced in diameter, and an external thread portion 41 is formed as an engaging portion on the outer peripheral side. Further, the globe 4 extends upward from the external thread portion 41 and transmits light from the LED lamp 20. A light transmission part 42 is formed.

The translucent globe 4 has a male screw portion 41 screwed into a female screw portion 32 of the globe receiving member 3 and is screwed through an annular packing 7 to be attached to the globe receiving member 3. Incidentally, the size of the globe 4 is about φ100 mm, and the length dimension of the light transmission part 42, that is, the total length L is formed to be about 150 mm.
The LED lamp 20 is mounted on the socket 6, and the LED 22 is turned on by the power supplied to the socket 6 through the power line 8.

By the way, in the development of the lighting apparatus 1 of the present embodiment, the present inventor shines the entire globe 4 brightly in the light distribution characteristic that the light emitted from the LED lamp 20 is mainly irradiated to the front side. Experiments were performed to be able to irradiate light. For example, the position of the LED lamp 20 relative to the globe 4 was changed and observed.
(Comparative Example 1)

  As shown in FIG. 4, the position of the socket 6 was moved downward, and the LED lamp 20 was shifted downward. In this case, from the light distribution characteristics of the LED lamp 20, it was confirmed that the light from the LED lamp 20 was irradiated over substantially the entire globe 4 and the globe 4 was brightly illuminated. Therefore, the light distribution as the luminaire 1 is substantially satisfactory.

  However, as a result of temperature measurement, it has been found that the junction temperature of the LED 22 may be exceeded. When this cause was investigated, it was assumed that the special property of the structure of this lighting fixture 1 had an influence. First, there is a portion where three of the support 2, the female screw portion 32 of the globe receiving member 3 and the male screw portion 41 of the globe 4 overlap, that is, there is a portion covered in triplicate. In addition, in order to facilitate the insertion of the glove receiving member 3 into the support column 2, a gap is generated between the two due to the fitting of these parts. This is because heat is less likely to be conducted to the support 2. It is also considered that the globe 4 is made of a glass material having a relatively low thermal conductivity.

Therefore, it has been found that it is necessary not to arrange the position P of the substrate 21 of the LED lamp 20 in the triple portion where the three of the support column 2, the globe receiving member 3 and the globe 4 overlap in the temperature condition. It was.
(Comparative Example 2)

  As shown in FIG. 5, based on Comparative Example 1, the position P of the substrate 21 of the LED lamp 20 is not arranged in a triple portion where the three of the support column 2, the globe receiving member 3 and the globe 4 overlap. The LED lamp 20 is arranged so as to be shifted downward while avoiding the portion.

In this case, although the temperature condition can be cleared, a part of the light emitted from the LED lamp 20 hits the lower end of the globe 4, and this lower end becomes an obstacle for light emission, and the lower portion of the globe 4 is relatively It has been found that there is a problem that it becomes dim.
(Summary)

  Based on the above results, we pursued a configuration that satisfies both the light distribution in which almost the entire globe 4 shines and the clearing of the temperature condition. As shown in FIG. 3, if the position P of the substrate 21 of the LED lamp 20 is equal to or less than 1/3 (point A in the figure) from the male screw portion 41 side in the entire length L of the light transmitting portion 42 of the globe 4, the globe It was confirmed that almost all of No. 4 was illuminated, and there was no problem with the light distribution and temperature conditions. Similarly, if the position P of the substrate 21 of the LED lamp 2 is 1/5 or less from the male threaded portion 41 side in the entire length L of the light transmitting portion 42 of the globe 4, the lower part of the globe 4 becomes brighter. It was confirmed that a preferable state was obtained.

  In addition, the temperature tends to rise even when the substrate 21 of the LED lamp 20 is located in the vicinity of the triple portion where the three of the support column 2, the globe receiving member 3 and the globe 4 overlap, and this triple portion It has been found that it is more preferable in terms of temperature to avoid the substrate 21 of the LED lamp 20 being positioned in the vicinity. Therefore, specifically, in the light transmission part 42 of the globe 4, it is desirable to avoid the substrate 21 from being located at a portion from the male screw part 41 side to about 10 mm in terms of temperature. The optimal value for the position of the 20 substrates 21 is in the range of 1/15 to 1/5 from the male screw portion 41 side in the entire length L of the light transmitting portion 42 of the globe 4.

  Next, the lighting fixture which concerns on the 2nd Embodiment of this invention is demonstrated with reference to FIG. In addition, the same code | symbol is attached | subjected to the part which is the same as that of 1st Embodiment, or an equivalent part, and the overlapping description is abbreviate | omitted.

  In this embodiment, the LED module 50 is used as the light source unit. The LED module 50 includes a heat sink 23 having a plurality of heat radiation fins, a substrate 21 attached to the heat sink 23, and a plurality of LEDs 22 mounted on the substrate 21. Therefore, the base 24 like the LED lamp 20 of the first embodiment is not provided. Power is supplied to the LED 22 through the power line 8.

  According to such a configuration, similarly to the first embodiment, by setting the position of the substrate 21 to a predetermined position and disposing it, it is possible to achieve a light distribution in which almost the entire globe 4 shines. The temperature condition can be cleared.

  The present invention is not limited to the configuration of each of the embodiments described above, and various modifications can be made without departing from the spirit of the invention. For example, the shape of the light transmission part of the globe is not limited to a cylindrical shape. It may be formed in a spherical or rectangular tube shape. Furthermore, if it has translucency, it does not necessarily need to have diffusibility.

DESCRIPTION OF SYMBOLS 1 ... Lighting fixture, 2 ... Support | pillar, 2a ... Opening part, 3 ... Globe receiving member,
4 ... Globe, 5 ... Cover case member,
20 ... Light source part (LED lamp), 21 ... Substrate, 22 ... LED,
32... Engaging part (female thread part), 41... Engaging part (male thread part),
42 ... light transmission part, 50 ... light source part (LED module),

Claims (1)

A cylindrical column having an opening;
A glove receiving member that is inserted into and attached to this support from the opening, and has an engaging portion on the inner peripheral side;
A translucent glove having an engaging portion engaged with the engaging portion of the globe receiving member on the outer peripheral side, and a light transmitting portion extending from the engaging portion;
A light source unit that has a substrate on which LEDs are mounted, and the position of the substrate is arranged to be 1/3 or less from the engagement portion side in the entire length of the light transmission portion of the globe;
The lighting fixture characterized by comprising.

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