JPS6343686Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] This invention relates to a ceiling-mounted lighting fixture equipped with a U-shaped fluorescent lamp.

[Background technology]

As shown in FIG. 3, in a conventional lighting device, a lamp insertion hole 2 is provided in the peripheral wall of a bell-shaped reflector 1, and the luminous tube of a U-shaped fluorescent lamp 3 is inserted into the reflector 1 through the lamp insertion hole 2. 3a, and then insert the arc tube 3a.
The U-shaped fluorescent lamp 3 is fixed so that the tube axis A of the reflector 1 is perpendicular to the central axis B of the reflector 1, and the base 3b of the U-shaped fluorescent lamp 3 is located outside the reflector 1.

In such a conventional lighting device, the tube axis A of the arc tube 3a of the U-shaped fluorescent lamp 3 and the center axis B of the reflector 1 are
are orthogonal to each other, and the distance from the center axis B of the reflector 1 to the tip side of the arc tube 3a is shorter than the distance from the central axis B to the cap side of the arc tube 3a. There was a problem in that the light shielding angle θ ₂ determined by the position on the distal end side of the arc tube 3a was larger than the light shielding angle θ ₁ determined by the side position, and the light distribution below the fixture became unbalanced.

Further, as shown in FIG. 4, in the U-shaped fluorescent lamp 3, the luminous flux at the tip side of the arc tube 3a is large as shown by arrow C, whereas the luminous flux at the base side of the arc tube 3a is large as shown by arrow D. The light from the tip side of the arc tube 3a is considerably blocked by the reflection plate 1 (the shielding angle θ ₂ is quite large), and as a result, the light from the tip side of the arc tube 3a and the edge of both the irradiation openings of the opposite plate 1 are The angle between the two lines connecting the two lines, that is, the irradiation angle α on the tip side of the arc tube 3a
was small, and the efficiency of the equipment was low.

[Purpose of invention]

This invention provides a lighting fixture that can make the shading angle determined by the position on the tip side of the arc tube of a U-shaped fluorescent lamp the same as the shading angle determined by the position on the base side of the arc tube, and can improve the efficiency of the device. With the goal.

[Disclosure of invention]

The lighting device of this invention is a lighting device in which a U-shaped lamp arc tube is arranged inside a reflector plate such that the distance from the central axis of the reflector plate is longer on the base side than on the tip side. The lamp is characterized in that the tube axis of the arc tube of the shape lamp is inclined with respect to the central axis of the reflector in a direction in which the tip side of the arc tube approaches the irradiation port of the reflector.

In this way, if the tube axis of the U-shaped lamp is inclined with respect to the center axis of the reflector in a direction in which the tip of the U-shaped lamp approaches the irradiation port of the reflector, the position of the tip of the arc tube of the U-shaped lamp and The shading angle determined by the position on the base side can be made the same,
The light distribution below the fixture can be balanced, and since the tip of the U-shaped lamp approaches the irradiation port of the reflector, the efficiency of the fixture can be increased.

Embodiment An embodiment of this invention will be described based on FIGS. 1 and 2. In this lighting device, a lamp insertion hole 2 is provided at the periphery of a bell-shaped reflector 1, and an arc tube 3a of a U-shaped fluorescent lamp is inserted into the reflector 1 through the lamp insertion hole 2. The U-shaped fluorescent lamp 3 is fixed in such a state that the axis A is inclined with respect to the central axis B of the reflector 1 in a direction in which the tip side of the arc tube 3a approaches the irradiation port of the reflector 1. The base portion 3b is located outside the reflecting plate 1.

The reflector 1 is attached to the appliance main body 4 with a reflector mounting bracket 5, a terminal block 6 and a glow lamp socket 7 are attached to the appliance body 4 with an attachment bracket 8, and a ballast 9 is attached. , a lamp socket 10 is fixed via a socket mounting plate 11, a glow lamp 12 is attached to the glow lamp socket 7, a U-shaped fluorescent lamp 3 is attached to the lamp socket 10, and an arc tube 3a is positioned within the reflector plate 1. ing.

Further, a mounting bracket 14 for fixing a decorative frame 13 at the lower end is attached to the appliance main body 4 in a hanging state. The ceiling material is held between elastic fixing fittings 15 fixed to fittings 14.

In this lighting device, the tube axis A of the arc tube 3a is inclined with respect to the central axis B of the reflector 1 in such a direction that the tip side of the arc tube 3a approaches the irradiation port of the reflector 1.
Since the arc tube 3a of the arc tube 3a is fixed inside the reflector 1, the shading angle determined by the position on the tip side of the arc tube 3a is θ ₂ ', and the shading angle θ is determined by the position on the base side of the arc tube 3a. It can be the same as ₁ , and the light distribution below the fixture can be balanced.

In addition, since the distal end of the arc tube 3a approaches the irradiation port of the reflector 1, the irradiation angle β at the distal end of the arc tube 3a can be made larger than the irradiation angle α in the conventional example, and the efficiency of the device can be increased. can.

The above-mentioned uniformity of the shading angle and improvement of equipment efficiency are as follows:
Since the mounting angle of the U-shaped fluorescent lamp 3 is simply changed without changing the shape of the reflector 1, the cost does not increase.

[Effect of idea]

In the lighting equipment of this invention, the tube axis of the U-shaped lamp is inclined with respect to the center axis of the reflector in a direction in which the tip of the U-shaped lamp approaches the irradiation port of the reflector. The shading angle determined by the side position and base side position can be made the same, making it possible to balance the light distribution below the fixture.Furthermore, since the tip of the U-shaped lamp approaches the irradiation port of the reflector plate, Equipment efficiency can be increased.

[Brief explanation of the drawing]

Fig. 1 is a side view of a lighting fixture according to an embodiment of this invention, Fig. 2 is a sectional view of the main part thereof, Fig. 3 is a sectional view of the main part of a conventional lighting fixture, and Fig. 4 A and B are respectively U
FIG. 2 is a side view and a plan view of a letter-shaped fluorescent lamp. 1...Reflector, 3...U-shaped fluorescent lamp, 3a
...A luminous tube.

Claims (1)

[Scope of utility model registration request] In a lighting equipment in which the arc tube of a U-shaped lamp is arranged inside a reflector plate, and the distance from the central axis of the reflector plate is longer on the base side than on the tip side, the arc tube of the U-shaped lamp A lighting device characterized in that an axis of the arc tube is inclined with respect to a central axis of the reflector in a direction in which a tip side of the arc tube approaches an irradiation port of the reflector.