JP2012089426A - 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 single-base fluorescent lamp excellently in respect of appearance.SOLUTION: The lighting fixture 10 is provided with a fixture body 11 with an underside open, and a single-base fluorescent lamp 12 mounted on the fixture body 11. The single-base fluorescent lamp 12 has its tip-end part 26 slanted toward an opening side of the fixture body 11 with respect to an axis line of the fixture body.

Description

  The present invention relates to a lighting fixture applied to a desk stand using a single-piece base fluorescent lamp.

2. Description of the Related Art Conventionally, there has been known a lighting fixture in which a single-piece fluorescent lamp is mounted on a fixture body, and a tip portion of the single-piece fluorescent lamp is in direct contact with air outside the fixture body (see, for example, Patent Document 1). .
In the lighting fixture described in Patent Document 1, the tip of the single-piece fluorescent lamp directly touches the air outside the fixture body, thereby suppressing the temperature rise at the coldest point of the single-piece fluorescent lamp and suppressing the decrease in luminous flux. it can.

JP-A-4-357605 (FIG. 1, claim 1)

However, in the lighting fixture described in Patent Document 1 described above, the tip of the single-piece fluorescent lamp is exposed from the fixture body.
Therefore, it cannot be said that the lighting fixture described in Patent Document 1 described above is favorable in terms of appearance.

By the way, like the lighting fixture described in Patent Document 1 described above, a lighting fixture in which a plurality of heat-dissipating holes are provided on the ceiling surface side of the fixture body so as to dissipate the heat at the tip of the single-piece fluorescent lamp. Has been proposed.
However, such a conventional lighting fixture cannot be said to be good in terms of appearance, like the lighting fixture described in Patent Document 1 described above.

  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. 3, 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 by suppressing the temperature rise at the coldest point of the single-piece fluorescent lamp with good appearance. There is to do.

  The lighting fixture according to the present invention includes a fixture main body having a lower opening, and a single-piece fluorescent lamp mounted on the fixture main body, and the single-piece fluorescent lamp has a distal end portion with respect to the axis. It is inclined to the opening side.

  As for the lighting fixture which concerns on this invention, the said front-end | tip part is located in the opening end of the said fixture main body in the said single-piece | unit fluorescent lamp.

  The lighting fixture according to the present invention has an effect that the lamp luminous flux can be improved by suppressing the temperature rise at the coldest point of the single-piece fluorescent lamp in an excellent appearance.

1 is an external perspective view of a lighting apparatus according to an embodiment of the present invention. The vertical sectional view around the fixture main body of the lighting fixture of one embodiment concerning the present invention Relationship diagram between lamp coldest spot temperature and temperature correction coefficient in lighting fixtures

Hereinafter, a lighting apparatus according to an embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, a lighting fixture 10 according to an embodiment of the present invention includes a fixture main body 11 that is open at the bottom, 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, 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 an electrical connection to the lighting device The desk stand includes a power line 16 that is pulled out 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 reflecting plate 23 formed in a semi-cylindrical shape similar to the top plate 18 inside the top plate 18, and a lamp support spring 24 is attached to 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 body 11 by having the base 25 at the base end electrically connected to the socket 22 and the tip 26 fitted into the lamp support spring 24. The socket 22 is electrically connected to the lighting device.
The number of single-piece fluorescent lamps 12 is not limited to a single number, and may be two or more.

At this time, the lamp supporting spring 24 is inclined at an angle θ1 toward the opening 19 side of the top plate 18 of the instrument body 11 with respect to the axis A1 of the instrument body 11 with respect to the axis A1 of the instrument body 11. The single-piece fluorescent lamp 12 is set so as to have the axis A2.
Therefore, even when heat is accumulated between the tip portion 26 and the reflection plate 23 during lighting, the one-piece fluorescent lamp 12 is tilted toward the opening portion 19 side of the top plate 18 of the instrument body 11. However, since it is positively brought into contact with the outside air outside the instrument body 11, the temperature rise at the coldest spot can be suppressed.

The single-piece fluorescent lamp 12 having the lamp axis A2 inclined at an angle θ1 toward the opening 19 side of the top plate 18 of the instrument main body 11 with respect to the axis A1 of the instrument main body 11 has a tip portion 26 of the instrument main body 11. It is located in the opening 19 that the top plate 18 has.
Therefore, in the single-piece fluorescent lamp 12, the distal end portion 26 inclined toward the opening 19 side of the top plate 18 of the instrument body 11 is positioned at the edge of the opening 19 of the top plate 18 of the instrument body 11. Therefore, it is possible to improve the appearance without exposing to the outside.

  As described above, according to the lighting fixture 10 of the embodiment described above, even when heat is accumulated between the tip portion 26 of the single-piece fluorescent lamp 12 and the reflector 23 when the single-piece fluorescent lamp 12 is turned on, the fixture main body. The tip portion 26 inclined to the opening 19 side of the top plate 18 of the eleventh is positively brought into contact with the outside air outside the instrument body 11, so that the temperature at the coldest spot of the one-piece base fluorescent lamp 12 is increased. It is possible to suppress the lamp luminous flux and suppress it.

  Moreover, according to the lighting fixture 10 of one Embodiment, the front-end | tip part 26 inclined to the opening part 19 side of the instrument main body 11 in the single-piece | unit fluorescent lamp 12 is the edge of the opening part 19 which the top plate 18 of the instrument main body 11 has. Since it is located at the edge, the one-piece fluorescent lamp 12 can be satisfactorily improved in appearance without being exposed to the outside.

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

DESCRIPTION OF SYMBOLS 10 Lighting fixture 11 Appliance main body 12 Single-piece | base metal fluorescent lamp 26 Tip part

Claims (2)

An instrument body with an open bottom;
A single-piece fluorescent lamp mounted on the instrument body,
The one-piece fluorescent lamp is a lighting fixture whose tip is inclined toward the opening side of the fixture body with respect to the axis. The lighting fixture according to claim 1,
The single-piece fluorescent lamp is a lighting fixture in which the tip portion is positioned at an open end of the fixture body.

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