JPH11134930A - Luminaire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrict the lowering of efficiency even lighting a fluorescent lamp having a relatively narrow outer diameter for high frequency lighting by providing an elastic body arranged so as to contact with an outer surface of a translucent airtight container for high frequency lighting fluorescent lamp and having insulating property and heat transmitting property, and providing a heat radiation means connected to the elastic body and arranged in an apparatus main body. SOLUTION: A heat radiation means 6 provided in an apparatus main body is connected to a rubber as an elastic body 5 arranged so as to contact with a fluorescent lamp 2 and having insulating property and heat conductivity. With this structure, even an airtight container having a curved surface can be deformed for tight fitting, and heat of the airtight container due to a temperature rise by lighting of the fluorescent lamp 2 is discharged out of the apparatus main body through the heat radiation means 6. Since the rubber as an elastic body 5 is tightly fitted to the airtight container and has insulating property, current leakage can be restricted. The airtight container of the fluorescent lamp, with which the elastic body 5 contacts, is cooled so as to form a most cold part, and the current leakage is restricted so as to improve the light emitting efficiency of the fluorescent lamp.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lighting apparatus provided with a high-frequency lighting fluorescent lamp having a relatively small outer diameter.

[0002]

2. Description of the Related Art Recently, lighting equipment has been downsized.
For this reason, attempts have been made to reduce the outer diameter of a fluorescent lamp used as a light source. Such a lighting fixture is disclosed in Japanese Patent Application Laid-Open No. 4-303510. This lighting fixture has a bulb outer diameter of 23 to 26 mm (so-called T8
) Fluorescent lamp is mounted and is lit at high frequency. Furthermore, on the ceiling side of this lighting fixture,
A vent hole is formed at a position facing the bulb end so as to radiate the heat of the fluorescent lamp.

[0003]

Such a T8 type fluorescent lamp tends to have a higher tube wall temperature during operation than a so-called T10 type fluorescent lamp. Since the heat hardly escapes from the fixture body, the ambient temperature of the fluorescent lamp rises, the tube wall temperature rises, the mercury vapor pressure becomes too high, and self-absorption of light by mercury increases. There is a problem that the luminous efficiency is deteriorated due to a decrease in the value.

Further, when the outside diameter of the valve is reduced as in the case of the T5 type, the load on the tube wall is increased by that amount, so that the temperature of the valve is increased. When compared at the same power consumption, at T5, the lamp current is reduced by the increase in the lamp voltage. Therefore, even if a slight leakage current occurs from the bulb, the luminous efficiency of the lamp may be significantly reduced.

[0005] It is an object of the present invention to provide a lighting fixture which can suppress a decrease in efficiency even when a fluorescent lamp having a relatively small outer diameter is turned on at a high frequency.

[0006]

According to the first aspect of the present invention, there is provided an apparatus main body; a pair of electrodes disposed on the apparatus main body, a light-transmitting hermetic container accommodating the electrodes, and an inner surface of the hermetic container. A high-frequency lighting fluorescent lamp comprising a filled phosphor layer and a discharge medium containing mercury and a rare gas sealed in a light-transmitting airtight container; It is characterized by comprising: an elastic body having an insulating property and a thermal conductivity arranged in contact with the heat; and a heat radiating means connected to the elastic body and arranged on the instrument body.

According to a second aspect of the present invention, in the first aspect, the elastic body is rubber.

[0008] The invention according to claim 3 is an apparatus main body; a pair of electrodes disposed on the apparatus main body, and having an outer diameter of about 1 to accommodate the electrodes.
A high-frequency lighting device having a light-transmitting airtight container of 5 to 26 mm, a phosphor layer formed on the inner surface side of the airtight container, and a discharge medium containing mercury and a rare gas sealed in the light-transmitting airtight container. A fluorescent lamp; an elastic body having insulating and thermal conductivity disposed in contact with the outer surface of the translucent airtight container of the high-frequency lighting fluorescent lamp; connected to the elastic body and disposed on the appliance body. A heat radiation means; and a high-frequency lighting circuit provided in the appliance body.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of a lighting apparatus showing an embodiment of the present invention, FIG. 2 is a transverse sectional view of FIG. 1, and FIG. 3 is a perspective view of a cooling means.

[0010] In the figure, a lighting fixture comprises a fixture body 1 and
The fluorescent lamp 2 for high-frequency lighting provided in the appliance body, the reflecting means 3 and the light controlling means 4 disposed opposite to the fluorescent lamp 2, and contacting the outer surface of the translucent airtight container of the fluorescent lamp. And an elastic body 5 having insulating and thermal conductivity, and a heat radiating means 6 arranged on the instrument body.

The apparatus main body 1 includes a top plate 1a, a side plate 1b connected to the top plate 1a, and a side plate 1b. The mounting plate of the socket is substantially parallel to the top plate 1a in the apparatus main body 1. Are fixed by welding, caulking, or the like, and the high-frequency lighting fluorescent lamp 2 is mounted in this socket. The instrument body 1 is formed of, for example, aluminum or a heat-resistant resin.

The fluorescent lamp 2 for high frequency lighting is about 45 KH.
It is lit with high frequency power of about z, and in the present embodiment, it has a rated input of 40 W. And
The fluorescent lamp 2 includes a translucent airtight container 2a, a phosphor layer 2
b, a discharge medium containing mercury and a rare gas sealed in the electrode 2c and the container 2a. Further, the translucent airtight container 2a is made of a soda-lime glass tube having a tube outer diameter of 23 to 26 mm (T5 to T8) and a lamp length of 1.2 m. On the inner surface of the container 2a, a protective film made of alumina fine particles and a three-wavelength light emitting phosphor layer 2b are formed so as to overlap each other.
The discharge medium was pure mercury and argon gas 2.4.
Torr is enclosed.

The reflecting means 3 has a curved reflecting portion 3b which is disposed optically facing the translucent airtight container 2a and irradiates light emitted from the fluorescent lamp obliquely downward.

Further, the light control means 4, for example, the louver structure, is arranged to face the intermediate portion 3b1 of the curved reflecting portion 3b and shields a part of the light emitted from the fluorescent lamp for irradiating obliquely below. And a light control unit 4b disposed opposite to the fluorescent lamp 2, for example, a louver blade. The louver blades 4b are arranged at equal distances between the light-shielding portions 4a at right angles to the light-shielding portions 4a. In addition,
The light-shielding portion 4a and the louver blades 4b are formed of a metal such as aluminum, iron, tinplate, or a heat-resistant resin.

A high-frequency lighting circuit (not shown) comprises a high-frequency inverter having a frequency of 45 KHz and a current-limiting impedance, and operates by being supplied with power from an AC power supply. Then, the input to the fluorescent lamp was changed to 120 W by operating the high frequency lighting device. As a result, the obtained maximum luminous efficiency was 91.5 lm / W, and the total luminous flux was 11000.
lm.

In the present embodiment, the heat radiating means 6 provided on the apparatus main body is connected to rubber, which is an elastic body 5 having insulation and heat conductivity, provided in contact with the fluorescent lamp 2. The airtight container 2a can be deformed and adhered to the curved airtight container 2a, and the temperature of the airtight container 2 increases when the fluorescent lamp 2 is turned on.
The heat of a is radiated to the outside of the appliance body 1 through the radiating means 6.

The rubber, which is the elastic body 5, is provided in the airtight container 2.
a, the current is likely to leak from the hermetic container 2a of the fluorescent lamp 2, but since the elastic body of the present embodiment also has insulating properties, the leak current can also be suppressed. . For this reason, the airtight container 2a of the fluorescent lamp with which the elastic body 5 is in contact is cooled to form the coolest part, and the leakage current can be suppressed, so that the luminous efficiency of the fluorescent lamp is improved.

[0018]

According to the luminaire of claims 1 to 3, an elastic body having insulating and heat conductivity, which is disposed in contact with the outer surface of the translucent airtight container of the fluorescent lamp for high frequency lighting, Since it has a heat radiating means connected to the elastic body and arranged on the apparatus main body, a part of the airtight container is cooled to form the coldest part and the leakage current can be suppressed, so that the fluorescent lamp is The luminous efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is a perspective view of a lighting device showing one embodiment of the present invention.

FIG. 2 is a cross-sectional view in FIG.

FIG. 3 is a perspective view of a cooling unit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Instrument main body 2 ... Fluorescent lamp 3 ... Reflecting means 4 ... Light control means 5 ... Elastic body 6 ... Cooling means

Claims (3)

[Claims] An apparatus main body; a pair of electrodes disposed on the apparatus main body, a translucent airtight container accommodating the electrodes, a phosphor layer formed on an inner surface side of the airtight container, and a translucent airtight container. A high-frequency lighting fluorescent lamp having a discharge medium containing mercury and a rare gas sealed therein; and insulating and heat disposed in contact with the outer surface of a translucent airtight container of the high-frequency lighting fluorescent lamp A lighting fixture comprising: an elastic body having conductivity; and a heat radiating means connected to the elastic body and disposed on the fixture body. 2. The lighting apparatus according to claim 1, wherein the elastic body is rubber. 3. An instrument body; a pair of electrodes disposed on the instrument body, a translucent airtight container having an outer diameter of about 15 to 26 mm for accommodating the electrodes, and a phosphor formed on the inner surface side of the airtight container. A high-frequency lighting fluorescent lamp having a layer and a discharge medium containing mercury and a rare gas sealed in the translucent airtight container; An elastic body having insulating and thermal conductivity provided; heat dissipating means connected to the elastic body and arranged on the instrument body; and a high frequency lighting circuit arranged on the instrument body. Lighting equipment characterized by the above-mentioned.