JPH01309249A - Discharge lamp - Google Patents

Abstract

PURPOSE:To enable the effective length of a glass bulb to be largely taken by forming recessed/projecting portions in the vicinity of both ends of the glass bulb and arranging conductors along the surfaces. CONSTITUTION:There are recessed/projecting portions 10, 11 formed with plural recesses in the arranged portions of the conductors 5, 6 of a glass bulb 9, and the conductors 5, 6 are provided along surfaces including the recessed/projecting portions 10, 11. When a high-frequency oscillating circuit 7 is actuated so as to impress the conductors 5, 6 with high frequency voltage, metal steam in the glass bulb 9 is ionized so that discharge is generated between the conductors 5, 6. The luminous quantity of a discharge lamp is related to the area of the conductors 5, 6, however there are recessed/projecting portions 10, 11 in the arranged portions of the conductors 5, 6, and thereby large area can be taken without widening the width of the conductors 5, 6. With this arrangement, the effective length of the glass bulb 9 can be largely taken.

Description

Detailed Description of the Invention [Industrial Application Field] This invention applies a high frequency voltage to a pair of electrodes provided near both ends of a substantially straight glass bulb, thereby reducing discharge gas within the glass bulb. The present invention relates to an electrodeless discharge lamp that emits light by discharging it.

[Conventional technology]

FIG. 2 is a block diagram schematically showing a conventional discharge lamp of this kind disclosed in, for example, Japanese Patent Application Laid-Open No. 62-185857.
A portion is shown cut away. In the figure, 1 is water≦14
A straight glass bulb filled with metal vapor and inert gas such as
Further, the phosphor 4 is coated 11i. 5.6 is a pair of conductors provided near both ends of the glass bulb 1, 7 is a high frequency oscillation circuit that applies a high frequency voltage to the pair of conductors 5.6, and 8 is an AC power source.

In the discharge lamp configured as described above, when the high frequency oscillation circuit 7 is activated by power supply insertion and a high frequency voltage is applied to the conductor 5.6, a high frequency T1. A magnetic field is generated and the metal vapor sealed in the glass bulb 1 is excited. The excitation of this metal vapor emits ultraviolet light, which is converted into visible light by the phosphor 4 applied to the inner surface of the glass bulb 1 and radiated to the outside through the opening 2.

Such a discharge lamp does not have an electrode with a filament inside the glass bulb 1, so it has a long life.
There is no blackening phenomenon at the end of the tube. However, glass bulb 1
Since both ends of the glass bulb 1 are covered with conductors 5.6, the amount of light emitted is reduced accordingly, and the effective length (emission length) of the glass bulb 1 in the axial direction is shortened. Further, the larger the area of the conductors 5 and 6, the more advantageous it is to obtain a large amount of light emission.

(Problem to be Solved by the Invention) Conventional discharge lamps are constructed as described above, and include glass bulbs! are formed in the shape of a straight tube with approximately the same diameter, so in order to increase the area of the metal conductors 5 and 6 in order to increase the amount of light emitted sufficiently, the width of the conductor 5 and 6 must be made wider. Therefore, there is a problem in that the effective length in the axial direction of the glass bulb 1 that contributes to light emission is shortened.

This invention was made to solve these problems, and its purpose is to obtain a discharge lamp that can have a large area without increasing the width of the conductor and has a long effective length of the glass bulb. There is.

(Means for Solving the Problems) In the discharge lamp of the present invention, uneven portions are formed near both ends of a substantially straight glass bulb filled with discharge gas, and a high-frequency voltage is applied to the outer surface including the uneven portions. A conductor is provided for this purpose.

[Effect]

In the discharge lamp of the present invention, uneven portions are formed near both ends of the glass bulb, and the bulb surface J +
't is enlarged by the unevenness. Since the conductor is arranged along this surface, a sufficient area can be obtained even if the width of the conductor is small.

(Embodiment) FIG. 1 is a block diagram showing an embodiment of the present invention. In the figure, reference numeral 5.6 denotes a conductor disposed on the surface near both ends of a substantially straight glass bulb 9 filled with discharge gas. There are uneven portions to, 11 formed by recesses, and the conductor 5.
6 is provided along the surface including the uneven portions 10.11.

7 is a high frequency excavation circuit that applies a high frequency voltage to the conductor 5.6, 8 is an AC power source, and 12 is a light emitting portion.

Note that the inside of the glass bulb 9 is filled with metal vapor such as mercury as a discharge gas, and also with an inert gas such as argon. Although not shown, a reflective film is provided on the inner surface of the glass bulb 9 except for one part, as in FIG. 2, and a fluorescent material is coated.

In the discharge lamp configured in this way, when the power is turned on, the high-frequency excavation circuit 7 is activated, and when a high-frequency voltage is applied to the conductor 5.6, the metal vapor in the glass bulb 9 is ionized, and the conductor A discharge occurs between the two. Then, the metal vapor sealed in the glass bulb 9 is excited, and ultraviolet rays are emitted from this metal vapor. Then, this ultraviolet light is converted into visible light by the phosphor coated on the inner wall surface of the glass bulb 9, and the glass bulb 9 is opened [1] either directly or through a reflective film.
are emitted from the same direction in approximately the same direction.

Here, the amount of light emitted by the discharge lamp is related to the area of the conductor 5.6 as described above, but in this embodiment, there is an uneven portion 10.11 in the area where the conductor 5.6 of the glass bulb 9 is disposed. Therefore, compared to the conventional case where the conductors 5 and 6 of the glass bulb 1 are provided with substantially the same tube diameter over the entire length, the conductors 5 and 6 have a narrower width.
6 is enough) 11 is obtained. Therefore, the area can be made sufficiently large without increasing the width of the conductors 5 and 6, and the effective length of the glass bulb 9 can be made large.

In addition, in the above embodiment, the uneven parts to and tt are formed by recesses near both ends of the glass bulb 9 where the conductors 5 and 6 are disposed, but the uneven parts may be formed by providing protruding parts. , a similar effect can be obtained.

〔Effect of the invention〕

As described above, according to the present invention, the uneven portions are formed near both ends of the glass bulb, and the conductor is arranged along the surface. Therefore, the area of the conductor can be increased without increasing the width of the conductor. Therefore, the effective length of the glass bulb can be increased.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a block diagram schematically showing a conventional discharge lamp. 5.6...Conductor 7...High frequency oscillation circuit 8...AC power supply 9...Glass bulb 10.11-...Irregularities The same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] In a discharge lamp, a conductor is arranged on the outer surface near both ends of a substantially straight glass bulb filled with a discharge gas, and a high frequency voltage is applied to the conductor to discharge the discharge gas and emit light. A discharge lamp characterized in that uneven portions are formed near both ends, and the conductor is disposed on the outer surface including the uneven portions.