JP3533053B2 - Lighting equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lighting device using a ring fluorescent lamp.

[0002]

2. Description of the Related Art Conventionally, ring-shaped fluorescent lamps composed of a single tube have been widely used for residential lighting. In particular, in order to obtain a high output, as shown in FIG. 5, two or more individual ring-shaped fluorescent lamps 12a and 12b are arranged in a stepped chevron shape, and the lamp lighting device section 3 is arranged in the center of the device. Is used.

[0003]

In such an illuminating device, the translucent outer envelope (so-called globe) must be thick and large in order to obtain uniform brightness. There is a problem that it is not economical and the degree of freedom is restricted in terms of the design of the device.

Further, in such a high output lighting device, since the plurality of ring-shaped fluorescent lamps 12a and 12b are arranged in different stages, the lamp 12b located below heats the lamp 12a located above. Since the thermal effects affect each other, miniaturizing the outer envelope causes the cold spot temperature of each lamp to rise excessively, which reduces the light output of the lamp.
There is also a problem in that restrictions easily occur in making the outer envelope small and thin.

Further, since the lighting device section 3 is built in a portion covered with a main body cover (not shown) inside the lamps stacked in a mountain shape, there is a disadvantage that the temperature is apt to rise and the main body is in a disadvantageous condition. It is a constraint on the miniaturization of the cover.

The present invention solves the problem that the conventional illumination device using a ring-shaped fluorescent lamp becomes thick and large, and realizes a thin, compact and novel design of the illumination device. In terms of performance, it is an object of the present invention to provide a high-output and high-efficiency ring-shaped fluorescent lamp illuminating device that suppresses a decrease in lamp light output by preventing thermal influence of individual lamps as in the conventional case.

[0007]

In a lighting device of the present invention, a plurality of ring-shaped fluorescent lamps and a lighting device section are arranged on a main body of a fixture, and a translucent outer envelope for surrounding the ring-shaped fluorescent lamps is provided. In the illuminating device provided, the ring-shaped fluorescent lamp
Is a plurality having an electrode at one end and a blocking portion at the other end
Two ring-shaped arc tubes arranged on approximately the same plane and in a substantially concentric pattern
Then, connect the other end vicinity with a bridge joint and
A cold spot is formed at the end and a single discharge is formed inside.
It is a ring-shaped fluorescent lamp having a path, wherein the lighting device section is
Arranged on the same plane as the plurality of ring-shaped fluorescent lamps
It has a different configuration.

With such a structure, firstly, it is possible to realize a thin and compact illuminating device having a novel design. Secondly, by disposing a plurality of lamps in a substantially concentric shape on the substantially same plane as described above, it is possible to reduce the thermal influence of each lamp, and as a result, the lamp light output is reduced as compared with the conventional lighting device. It is possible to realize a lighting device that also suppresses

Further, in the ring-shaped fluorescent lamp, a plurality of ring-shaped arc tubes each having an electrode at one end and a closed portion at the other end are arranged in substantially the same plane and in a substantially concentric shape, and the other end is in the vicinity thereof. It is preferable that the ring-shaped fluorescent lamp has a double-tube structure in which one discharge path is formed by being joined by a bridge joining portion. If such a lamp is used, the light output can be improved and the surface brightness of the outer envelope can be made more uniform.

[0010]

DETAILED DESCRIPTION OF THE INVENTION

(Embodiment 1) FIG. 1 is a side sectional view of a lighting device according to a first embodiment of the present invention, FIG. 2 is a partially cutaway plan view of the lighting device of the present invention, and FIG. 3A and 3B are plan views of a ring-shaped fluorescent lamp having a double tube structure used in the lighting device of FIG.

As shown in FIG. 1 and FIG. 2, the illumination device of the present invention comprises a plurality of ring-shaped fluorescent lamps 2 on the main body 1 of the fixture.
a, 2b and the lighting device unit 3 are arranged, and further, the ring-shaped fluorescent lamps 2a, 2b and the lighting device unit 3 are configured to include a light-transmitting globe 4. The lighting device section 3 has a substantially disc shape, and is arranged substantially on the same plane as the ring-shaped fluorescent lamps 2a and 2b, further inside the ring-shaped fluorescent lamp 2b located on the innermost side.

On the other hand, as shown in FIG. 3, in the ring-shaped fluorescent lamps 2a and 2b having the double-tube structure, two glass ring-shaped arc tubes 5 and 6 are arranged on substantially the same plane and in substantially concentric circles. The electrodes 7, 8 are attached to one end of each of the ring-shaped arc tubes 5, 6. The other ends 9, 10 of the ring-shaped arc tubes 5, 6 are closed, and the other ends 9, 1
The vicinity of 0 is joined by a bridge joint portion 11 made of a glass tube, whereby the electrodes 7 inside the arc tube,
One discharge path is formed between the eight. A phosphor is applied to the inner surfaces of the arc tubes 5 and 6, and mercury and a rare gas such as argon or neon as a buffer gas are enclosed in the tubes.

As shown in FIG. 1, the lighting device of the present invention comprises:
Firstly, the ring-shaped fluorescent lamps 2a and 2b are arranged on substantially the same plane and in a substantially concentric shape, which makes the fixture thinner than the configuration of the conventional lighting device shown in FIG. 5, for example. It is clear that compactness has been realized. Further, the lighting device section 3 composed of an inverter type electronic circuit is also arranged in substantially the same plane as the ring-shaped fluorescent lamps 2a and 2b, thereby further thinning the lighting device.

On the other hand, in terms of lamp performance, since the ring-shaped fluorescent lamps 2a and 2b are arranged on substantially the same plane and in substantially concentric circles, the uniformity of the surface brightness of the outer envelope 4 of the illuminating device is the same as that of the conventional lamp. This is an improvement over lighting devices that have been arranged in different stages. In this case, when the ring-shaped fluorescent lamp having the double-tube structure shown in FIG. 3 is adopted as described above, the light emitting surface becomes closer to a planar shape as compared with the case of a single ring-shaped fluorescent lamp, and the uniformity of brightness is further improved. To be done.

As shown in FIG. 2, the base portion 12 of the outer ring-shaped fluorescent lamp 2a and the base portion 13 of the inner ring-shaped fluorescent lamp 2b are located on opposite sides of each other, so that the electrode portion having the highest temperature can be obtained. It is possible to reduce the mutual thermal influence by separating the non-light emitting portions from each other and to disperse the non-light emitting portions on one side so as to make the luminance uniform.

Further, when the ring-shaped fluorescent lamps are arranged on substantially the same plane and in the same circular center, the degree of mutual thermal influence is lower than that of the conventional appliances. Therefore, the increase in the coldest spot temperature of each of the ring-shaped fluorescent lamps 2a and 2b is reduced, and the decrease in the light output is suppressed accordingly. Even in this case, when the ring-shaped fluorescent lamp having the double-tube structure shown in FIG. 3 is used, the coldest spots are formed at the tips of the other ends 9 and 10 of the ring-shaped arc tubes 5 and 6. Because
Even when the light is turned on in the lighting device, the decrease in light output is extremely small. Therefore, it is possible to further reduce the thickness of the lighting device.

Table 1 shows the results of comparison of specific design values and lamp performance of the illuminating device shown in FIG. 1 with an illuminating device using a conventional single tube ring fluorescent lamp.

[0018]

[Table 1]

As shown in Table 1, the lighting device of the present invention comprises:
The outer diameter of the equipment is the same as the conventional one, and the thickness is about 1/2, which is extremely thin, and the luminous flux of the lamp is about three times that of the conventional one
The lamp efficiency is improved by about 30% and it has extremely excellent performance. In this case, the high light output can be obtained partly because the decrease in the light output when the device is turned on is suppressed.
Further, as shown in FIG. 2, the arc tubes are arranged in a quadruple, substantially concentric shape, and as a result, they approach the surface light source as a whole, so that the uniformity of the glove portion brightness of the device is also improved.

It should be noted that the smaller the distance between the ring-shaped fluorescent lamps 2a and 2b is, the more preferable it is for downsizing of the equipment and the uniformity of the brightness. However, considering mutual heat influence and the ease of lamp replacement, the lamp replacement is performed. It is preferable that the interval is 15 [mm] or more so that a finger can be inserted at any time.

(Embodiment 2) FIG. 4 is a partially cutaway plan view of an illumination device according to a second embodiment of the present invention.

As shown in FIG. 4, in this embodiment, a substantially ring-shaped or substantially C-shaped lighting device section 4 is arranged between the ring-shaped fluorescent lamps 2a and 2b. With such a configuration, the distance between the lamps is increased and the thermal influence between the lamps is further reduced, so that the decrease in light output is further suppressed.

Further, the lighting device section 3 has a substantially C shape,
AC in the AC input section 15 in the center (opposite to the cutout)
A ring-shaped fluorescent lamp 2 to which a commercial power source (not shown) is connected
Inverters for driving a and 2b are provided separately on the left and right sides, and power is supplied from the output ends at both ends to the cap portions 12 and 13 of the ring-shaped fluorescent lamps 2a and 2b through the cable 14.

With such a configuration, compared with the case where two inverters are connected in cascade, the feed wiring pattern is not required, which is advantageous in designing the board, and the voltage drop is small (the decrease in optical output is small). There are also advantages such as low noise. In addition, since the ring-shaped fluorescent lamp and the circuit board are arranged in a substantially concentric shape in close proximity to each other, the startability of the lamp is good. Furthermore, it is possible to dispose the inverter unit away from the electrodes 7 and 8 that become hot during lamp lighting.

[0025]

As described above, in the lighting device of the present invention, the plurality of ring-shaped fluorescent lamps are arranged on substantially the same plane and in the substantially concentric shape, so that the fixture can be made thin and compact, and Since the decrease in the light output of the lamp when the light is turned on in the fixture is suppressed, a lighting device with high output and high efficiency and a novel design is realized.

[Brief description of drawings]

FIG. 1 is a side sectional view of a lighting device according to a first embodiment of the present invention.

[FIG. 2] Similarly, a partially cutaway plan view

FIG. 3 is a plan view of a ring-shaped fluorescent lamp used in the lighting device of the present invention.

FIG. 4 is a partially cutaway plan view of a lighting device according to a second embodiment of the present invention.

FIG. 5 is a side sectional view of a lighting device using a conventional ring-shaped fluorescent lamp.

[Explanation of symbols]

1 instrument body 2a, 2b Ring type fluorescent lamp 3 Lighting device section 4 gloves 5,6 arc tube 7,8 electrodes 9,10 The other end 11 bridge junction

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroyuki Mikami 1048, Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Works, Ltd. (72) Masaaki Ichikawa, 1048, Kadoma, Kadoma City, Osaka Matsushita Electric Works, Ltd. (72) Inventor Takashi Yoshinari 1048, Kadoma, Kadoma, Osaka Prefecture Matsushita Electric Works, Ltd. (72) Kazushi Kubo, 1048, Kadoma, Kadoma, Osaka Prefecture (72) Inventor, Kuriaki Hitoshi, Osaka 1048 Kadoma, Kadoma, Fuchu, Matsushita Electric Works Co., Ltd. (56) Reference JP 54-115579 (JP, A) JP 62-5599 (JP, A) JP-A-3-503464 (JP, A) ) (58) Fields surveyed (Int.Cl. ⁷ , DB name) F21S 4/00 F21S 8/04 H01J 61/32

Claims (3)

(57) [Claims] [Claim 1] A plurality of circular fluorescent lamp on the instrument body and the lighting device unit is disposed in an illumination apparatus having an outer surrounding instrument translucent surrounds the circular fluorescent lamp, the
The ring-shaped fluorescent lamp has an electrode at one end and is closed at the other end.
A plurality of ring-shaped arc tubes each having a
Arranged in a circular shape, and the other end is joined by a bridge joint.
The coldest spot is formed at the tip of the other end and
A ring-shaped fluorescent lamp in which a single discharge path is formed,
The lighting device part is substantially flush with the plurality of ring-shaped fluorescent lamps.
A lighting device, which is arranged on the top . Wherein said lighting device portion has a flat shape, and lighting device according to claim 1, characterized in that it is arranged on the circular fluorescent lamp and substantially the same plane. Wherein the lighting device unit has a ring shape, and, according to claim 2, between the plurality of circular fluorescent lamps, characterized in that it is disposed in the circular fluorescent lamp substantially concentric The lighting device according to.