JP2012089427A - Lighting fixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting fixture capable of improving lamp light flux through restraint of temperature rise at the coldest point of a fluorescent lamp in respect of appearance.SOLUTION: The lighting fixture 10 is provided with a fixture body with an underside open, a reflecting plate 23 fitted to an inside of the fixture body, and a fluorescent lamp 12 housed inside the reflecting plate 23. The reflecting plate 23 has a heat-transfer restraining part 31 at a boundary of a socket-side region and an opposite region.

Description

  The present invention relates to a lighting fixture applied to a desk stand using a fluorescent lamp.

2. Description of the Related Art Conventionally, there has been known a lighting fixture in which a fluorescent lamp is surrounded by a fixture main body, and an opening is provided in the fixture main body on the side opposite to a base in the longitudinal direction of the fluorescent lamp (for example, see Patent Document 1).
In the lighting fixture described in Patent Document 1, the tip portion opposite to the base of the fluorescent lamp directly touches the outside air through the opening, thereby suppressing the temperature rise at the coldest spot of the fluorescent lamp and suppressing the decrease in the luminous flux.

Japanese Utility Model Publication No. 4-76205 (FIG. 1, claim 1)

However, in the luminaire described in Patent Document 1 described above, the temperature of the base of the fluorescent lamp and the socket to which the base is attached are high when the fluorescent lamp is turned on. Then, the heat is transmitted to the instrument body, and the heat is transmitted to the tip of the fluorescent lamp through the instrument body, so that the temperature of the tip of the fluorescent lamp rises.
Therefore, the lighting fixture described in Patent Document 1 described above cannot reliably suppress the temperature rise at the coldest spot of the fluorescent lamp.

By the way, similarly to the lighting apparatus described in Patent Document 1 described above, a lighting apparatus is proposed in which a plurality of heat radiation holes are provided on the ceiling surface side of the apparatus main body so as to dissipate heat from the tip of the fluorescent lamp. Has been.
However, such a conventional lighting fixture cannot be said to be good in terms of appearance since it has a hole in the fixture body.

  In general, how much brightness can be extracted per power consumption is expressed by energy consumption efficiency. This energy consumption efficiency is defined by the following formula according to JIS.

As apparent from Equation 1, the temperature correction coefficient is low when the lamp temperature is high. Therefore, in order to increase energy consumption efficiency, it is necessary to increase the temperature correction coefficient.
As is apparent from the relationship between the lamp coldest spot temperature and the temperature correction coefficient, as shown in FIG. 7, in order to increase the temperature correction coefficient, it is necessary to lower the lamp coldest spot temperature.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a luminaire that can improve the luminous flux of the lamp while suppressing the temperature rise at the coldest spot of the fluorescent lamp in terms of appearance. It is in.

  A lighting fixture according to the present invention includes a fixture main body having a lower opening, a reflection plate attached to the inside of the fixture main body, and a fluorescent lamp accommodated inside the reflection plate, wherein the reflection plate is a socket. A heat transfer suppression unit is provided at the boundary between the region on the side and the region on the opposite side.

  As for the lighting fixture which concerns on this invention, the said heat transfer suppression part is a slit.

  As for the lighting fixture which concerns on this invention, the said heat transfer suppression part is comprised from the material whose heat conductivity is lower than the said reflecting plate.

  As for the lighting fixture which concerns on this invention, the said heat transfer suppression part is formed smaller thickness than the said reflecting plate.

  According to the lighting fixture according to the present invention, it is possible to improve the lamp luminous flux by suppressing the temperature rise at the coldest spot of the fluorescent lamp in terms of appearance.

1 is an external perspective view of a lighting apparatus according to a first embodiment of the present invention. The vertical sectional view around the fixture main body of the lighting fixture of the first embodiment according to the present invention The external appearance perspective view seen from diagonally upward around the reflector of the lighting fixture of 1st Embodiment which concerns on this invention The external appearance perspective view seen from diagonally upward around the reflector of the lighting fixture of 2nd Embodiment which concerns on this invention The external appearance perspective view seen from diagonally upward around the reflector of the lighting fixture of 3rd Embodiment which concerns on this invention The external appearance perspective view seen from diagonally upward around the reflector of the lighting fixture of 4th Embodiment which concerns on this invention Relationship diagram between lamp coldest spot temperature and temperature correction coefficient in lighting fixtures

Hereinafter, the lighting fixture of several embodiment which concerns on this invention is demonstrated with reference to drawings.
(First embodiment)
As shown in FIG. 1, the lighting fixture 10 according to the first embodiment of the present invention includes a fixture main body 11 having a lower opening, a single-piece fluorescent lamp 12 accommodated in the fixture main body 11, and a single-piece fluorescent lamp 12. An arm 13 for changing the irradiation direction of the light source, a power tower 14 that houses a lighting device (not shown) and supports the arm 13, a switch 15 disposed on the front surface of the power tower 14, and the lighting device electrically The desk stand includes a power line 16 connected and drawn from the power tower 14 and a base 17 that supports the power tower 14.

  As shown in FIG. 2, the instrument main body 11 is made of metal or hard resin, is formed in a semi-cylindrical shape, has a top plate 18 having an opening 19 below, and is connected to a base end portion of the top plate 18. And the end plate 21 connected to the tip of the top plate 18. As for the instrument main body 11, the socket 22 is attached to the socket accommodating part 20. As shown in FIG. The appliance main body 11 has a reflection plate 23 inside the top plate 18, and a lamp support spring 24 on the opposite side of the socket 22.

  The single-base fluorescent lamp 12 has a base 25 at the base end which is one side. The single-piece fluorescent lamp 12 is attached to the instrument main body 11 by mounting the base 25 of the base end portion so as to be electrically connectable to the socket 22 and fitting the tip end portion 26 to the lamp support spring 24. The socket 22 is electrically connected to the lighting device.

As shown in FIG. 3, the reflecting plate 23 is made of metal or hard resin and is formed in a U shape in a sectional view. The reflection plate 23 has a lower opening 27 below and a tip opening 28 on the opposite side of the socket 22. The reflecting plate 23 accommodates a pair of one-piece fluorescent lamps 12 inside.
The reflector 23 may be formed in a semicircular shape in a cross-sectional view or a trapezoidal shape such as a cross-sectional view instead of a U-shape in a cross-sectional view.

  The reflection plate 23 has a socket-side reflection plate portion 29 on the socket 22 side of the instrument body 11, and a tip-side reflection plate portion 30 on the opposite side of the socket 22. The reflection plate 23 is a connection plate portion that is a heat transfer suppression portion having a width dimension sufficiently smaller than the width dimension of the reflection plate 23 at the boundary between the socket side reflection plate portion 29 and the front end side reflection plate portion 30. 31.

  Since the connecting plate portion 31 has a width dimension sufficiently smaller than the width size of the reflecting plate 23 and is arranged at the center portion of the top portion, the end portion 32 and the front end side of the socket side reflecting plate portion 29 are arranged. A space portion 34 that does not transmit heat is formed between the end portion 33 of the reflecting plate portion 30.

  In the lighting fixture 10, when the single-piece fluorescent lamp 12 is turned on, the temperature on the base 25 side of the single-piece fluorescent lamp 12 becomes high. Then, the heat is transmitted to the socket-side reflector 29 on the socket 22 side in the reflector 23. However, since the heat transmitted to the socket-side reflector 29 is not transmitted to the tip-side reflector 30 by the space 34 around the connection plate 31, the tip-side reflector 30 is affected by the heat. Accordingly, the temperature rise is suppressed, and heat is not transmitted to the front end portion 26 of the one-piece base fluorescent lamp 12. At this time, the heat transmitted to the socket-side reflecting plate portion 29 convects inside the instrument body 11 through the space portion 34 around the connection plate portion 31.

  According to the lighting apparatus 10 of the first embodiment, the heat transmitted to the socket-side reflecting plate portion 29 when the one-piece fluorescent lamp 12 is turned on is transferred to the tip-side reflecting plate portion 30 by the space portion 34 around the connecting plate portion 31. For this reason, the tip-side reflector 30 is not affected by heat and the temperature rise is suppressed, and heat is not transmitted to the tip 26 of the single-piece fluorescent lamp 12, so that the coldest spot of the single-piece fluorescent lamp 12 is provided. The lamp luminous flux can be improved by suppressing the temperature rise.

(Second Embodiment)
Next, the lighting fixture of 2nd Embodiment which concerns on this invention is demonstrated. In the following embodiments, components that are the same as those in the first embodiment described above or components that are functionally similar are denoted by the same or corresponding reference numerals in the drawings, and the description thereof is simplified or omitted. To do.

  As shown in FIG. 4, in the lighting fixture 40 according to the second embodiment of the present invention, the reflector 41 has a socket-side reflector 42 on the socket 22 side of the fixture body 11 and on the opposite side of the socket 22. The front-side reflecting plate portion 43 is provided, and a spatial slit 44 that is a heat transfer suppressing portion is provided at the boundary between the socket-side reflecting plate portion 42 and the front-end-side reflecting plate portion 43.

  In the lighting fixture 40, when the single-piece fluorescent lamp 12 is turned on, the temperature on the base 25 side of the single-piece fluorescent lamp 12 becomes high. Then, the heat is transmitted to the socket-side reflector 42 on the socket 22 side in the reflector 41. However, since the heat transmitted to the socket-side reflecting plate portion 42 is not transferred to the tip-side reflecting plate portion 43 by the slit 44, the tip-side reflecting plate portion 43 is not affected by heat and the temperature rise is suppressed. The heat is not transmitted to the tip portion 26 of the single-piece fluorescent lamp 12.

  According to the lighting fixture 40 of the second embodiment, the heat transmitted to the socket-side reflecting plate portion 42 when the one-piece fluorescent lamp 12 is lit is not transferred to the tip-side reflecting plate portion 43 through the slits 44. Since the temperature of the portion 43 is not affected by heat and the temperature rise is suppressed and heat is not transmitted to the tip portion 26 of the single-piece fluorescent lamp 12, the temperature of the coldest spot of the single-piece fluorescent lamp 12 is suppressed and the luminous flux of the lamp is reduced. Can be improved.

(Third embodiment)
Next, the lighting fixture of 3rd Embodiment which concerns on this invention is demonstrated.
As shown in FIG. 5, in the lighting fixture 50 according to the third embodiment of the present invention, the reflecting plate 51 has a socket-side reflecting plate portion 52 on the socket 22 side of the fixture body 11 and on the opposite side of the socket 22. The front-side reflecting plate portion 53 is provided and is made of an acrylic resin material that is a heat transfer suppressing portion and has a lower thermal conductivity than the reflecting plate 51 at the boundary between the socket-side reflecting plate portion 52 and the leading-end side reflecting plate portion 53. The gap member 54 is provided.

  In the lighting fixture 50, when the single-piece fluorescent lamp 12 is turned on, the temperature on the base 25 side of the single-piece fluorescent lamp 12 becomes high. Then, the heat is transmitted to the socket-side reflecting plate portion 52 on the socket 22 side in the reflecting plate 51. However, since the heat transmitted to the socket-side reflector 52 is not transmitted to the tip-side reflector 53 by the gap member 54 having low thermal conductivity, the tip-side reflector 53 is not affected by heat. The rise in temperature is suppressed, and heat is not transmitted to the tip portion 26 of the single-piece fluorescent lamp 12.

  According to the lighting fixture 50 of the third embodiment, heat transmitted to the socket-side reflecting plate portion 52 when the one-piece fluorescent lamp 12 is lit is not transferred to the tip-side reflecting plate portion 53 by the gap member 54 having low thermal conductivity. In addition, since the tip-side reflector 53 is not affected by heat and the temperature rise is suppressed and heat is not transmitted to the tip portion 26 of the single-piece fluorescent lamp 12, the temperature of the coldest spot of the single-piece fluorescent lamp 12 is reduced. It is possible to improve the lamp luminous flux while suppressing the rise.

(Fourth embodiment)
Next, the lighting fixture of 4th Embodiment which concerns on this invention is demonstrated.
As shown in FIG. 6, in the lighting fixture 60 according to the fourth embodiment of the present invention, the reflector 61 has a socket-side reflector 62 on the socket 22 side of the fixture body 11 and on the opposite side of the socket 22. The front-side reflecting plate part 63 is provided, and at the boundary between the socket-side reflecting plate part 62 and the leading-end side reflecting plate part 63, a heat transfer suppressing part, which is a plate of the socket-side reflecting plate part 62 and the tip-side reflecting plate part 63. The connecting portion 64 has a plate thickness dimension sufficiently smaller than the thickness dimension. The connecting portion 64 has a plate thickness dimension that is sufficiently smaller than the plate thickness dimensions of the socket-side reflecting plate portion 62 and the tip-side reflecting plate portion 63, and therefore has a low thermal conductivity.

  In the lighting fixture 60, when the single-piece fluorescent lamp 12 is turned on, the temperature on the base 25 side of the single-piece fluorescent lamp 12 becomes high. Then, the heat is transmitted to the socket side reflector 62 on the socket 22 side in the reflector 61. However, since the heat transmitted to the socket-side reflecting plate portion 62 is not transferred to the tip-side reflecting plate portion 63 by the connecting portion 64 having a low thermal conductivity, the tip-side reflecting plate portion 63 is not affected by heat. The rise in temperature is suppressed, and heat is not transmitted to the tip portion 26 of the single-piece fluorescent lamp 12.

  According to the lighting fixture 60 of the fourth embodiment, heat transmitted to the socket-side reflector 62 when the one-piece fluorescent lamp 12 is lit is not transmitted to the tip-side reflector 63 by the connecting portion 64 having low thermal conductivity. In addition, since the tip-side reflector 63 is not affected by heat and the temperature rise is suppressed and heat is not transmitted to the tip portion 26 of the single-piece fluorescent lamp 12, the temperature of the coldest spot of the single-piece fluorescent lamp 12 is reduced. It is possible to improve the lamp luminous flux while suppressing the rise.

  In the lighting fixture of the present invention, the fixture main body, single-piece fluorescent lamp, socket, lamp support spring and the like are not limited to the above-described embodiments, and appropriate modifications and improvements can be made.

10, 40, 50, 60 Lighting equipment 11 Equipment body 12 Single-piece fluorescent lamp (fluorescent lamp)
23, 41, 51, 61 Reflector 31 Connection plate (heat transfer suppression unit)
44 Slit (Heat transfer suppression part)
54 Gap member (heat transfer suppression part)
64 connection part (heat transfer suppression part)

Claims (4)

An instrument body with an open bottom;
A reflector attached to the inside of the instrument body;
A fluorescent lamp housed inside the reflector,
The said reflecting plate is a lighting fixture which provides a heat transfer suppression part in the boundary of the area | region of a socket side, and the area | region on the opposite side. The lighting fixture according to claim 1,
The said heat transfer suppression part is a lighting fixture which is a slit. The lighting fixture according to claim 1,
The said heat transfer suppression part is a lighting fixture comprised from the material whose heat conductivity is lower than the said reflecting plate. The lighting fixture according to claim 1,
The said heat transfer suppression part is a lighting fixture formed in thickness smaller than the said reflecting plate.

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