JPH058862U - Electrodeless discharge lamp - Google Patents

Abstract

(57) [Abstract] [Purpose] To prevent the luminous flux from deteriorating and to prevent an induced current from being generated in the mercury dispenser provided in the bulb, thereby improving the efficiency of the lamp. [Structure] A phosphor 3 is applied to the inner surface of a translucent bulb 2 containing a discharge gas. An induction coil 4 is wound around the outer circumference of the valve 2, and both ends thereof are connected to a high frequency generation circuit 5. 6 is a mercury dispenser, which is arranged such that its flat plate surface is substantially perpendicular to the circumferential surface of the induction coil 4. [Effect] The magnetic flux interlinking with the mercury dispenser 6 is small, and an induced current hardly flows through the mercury dispenser 6. Therefore, there is almost no power loss in the mercury dispenser 6, and an efficient lamp can be obtained.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an electrodeless discharge lamp which has no electrode inside the lamp and discharges and discharges discharge gas inside the lamp by a high frequency electromagnetic field from the outside.

[0002]

[Prior Art]

 Conventionally, there has been provided a fluorescent lamp in which mercury atoms are excited by arc discharge to emit ultraviolet rays, and the ultraviolet rays are applied to the phosphor layer to obtain visible light, but this type of fluorescent lamp is Relatively short life and low efficiency.

In order to solve this problem, an electrodeless discharge lamp having a long life and high efficiency has been proposed for about 10 years, for example, it is disclosed in Japanese Patent Laid-Open No. 57-78766. There is. In this lamp, a high frequency is applied to an induction coil placed close to a bulb filled with discharge gas, and the generated induction electromagnetic field discharges and emits discharge gas in the bulb.

Further, according to the electrodeless discharge lamp disclosed in Japanese Patent Laid-Open No. 61-71957, as shown in FIG. 3, the lamp 1 has an induction coil 4 wound around an outer circumference of a substantially spherical bulb 2. The light emitting surface area of the lamp 1 is small, that is, a small-sized and high-intensity light source is possible, and it has the features of long life and high efficiency.

FIG. 4 shows an outline of an apparatus equipped with the above-mentioned electrodeless discharge lamp. A bulb-shaped bulb 2 is filled with mercury and a noble gas as discharge gas, and a phosphor is provided on the inner surface. 3 is applied. Then, the high-frequency current output from the high-frequency generation circuit 5 is passed through the induction coil 4 to discharge and discharge the discharge gas. Reference numeral 6 in the figure denotes a mercury dispenser fixed to the stem 7 via a support wire 8. The mercury dispenser serves as a mercury supply source and absorbs impure gas in the bulb 2 to prevent deterioration of the luminous flux of the lamp 1. Further, reference numeral 9 is a base portion for mounting the lamp 1 on the apparatus main body (not shown).

[0006]

[Problems to be solved by the device]

 By the way, in such an electrodeless discharge lamp, the mercury dispenser 6 is arranged near the center of the discharge at high temperature, that is, in the vicinity of the center of the annular induction coil 4 in order to increase the impure gas absorbing capacity. However, in this case, the magnetic field generated from the induction coil 4 interlinks with the mercury dispenser 6, so that an induced current is generated in the mercury dispenser 6. Then, the high frequency power output from the induction coil 4 is absorbed by the mercury dispenser 6, and the efficiency of the lamp 1 is reduced.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an electrodeless discharge lamp having high efficiency and less deterioration of luminous flux.

[0008]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the present invention proposes a method in which an induction coil is wound in the vicinity of a translucent bulb in which a discharge gas is sealed, and a high-frequency current is passed through the induction coil to generate the discharge of the discharge field. An electrodeless discharge lamp that discharges and emits gas is characterized in that a mercury dispenser is arranged in the bulb so that its flat plate surface is substantially perpendicular to the circumferential surface of the induction coil.

[0009]

【Example】

 FIG. 1 shows an embodiment of the present invention. In the figure, reference numeral 1 is an electrodeless discharge lamp in which a phosphor 3 is applied to the inner surface of a light-transmissive bulb 2 containing a discharge gas. Reference numeral 4 denotes an induction coil wound around the outer circumference of the valve 2 and energizes the high frequency current output from the high frequency generation circuit 5. Reference numeral 6 is a ring-shaped mercury dispenser, which is arranged so that its flat plate surface is substantially perpendicular to the circumferential surface of the induction coil 4, and is fixed to the stem 7 via a support wire 8. Reference numeral 9 denotes a base portion, which is used only for mounting the lamp 1 on the apparatus main body (not shown).

In the electrodeless discharge lamp configured as described above, when a high-frequency current output from the high-frequency generation circuit 5 is applied to the induction coil 4, an induction electromagnetic field is generated in the induction coil 4, and the discharge gas discharges and emits light. To do. Further, since the mercury dispenser 6 is arranged near the center of the discharge, the mercury dispenser 6 becomes hot and absorbs the impure gas in the bulb 2 to prevent the deterioration of the luminous flux of the lamp 1.

By the way, the mercury dispenser 6 is arranged in the induction electromagnetic field generated from the induction coil 4. However, as described above, the flat plate surface thereof is substantially perpendicular to the circumferential surface of the induction coil 4. The magnetic flux interlinking with the mercury dispenser 6 is small, and the induced current hardly flows through the mercury dispenser 6. Therefore, there is almost no power loss in the mercury dispenser 6, and the lamp becomes an efficient lamp.

FIG. 2 shows a different embodiment of the present invention. The difference from the above embodiment is that the mercury dispenser 6 has a flat plate shape, and other configurations are the same as the above embodiment. Therefore, the description will be omitted by giving the same reference numerals to the same components.

With this configuration, the same effects as those of the above-described embodiment can be obtained, and the mercury dispenser 6 can be easily attached.

[0014]

[Effect of the device]

 According to the present invention, as described above, the mercury dispenser is arranged in the bulb so that the flat surface of the mercury dispenser is substantially perpendicular to the circumferential surface of the induction coil. Since the loss is small, it is possible to provide an electrodeless discharge lamp with improved efficiency.

[Brief description of drawings]

FIG. 1 is a simplified diagram showing an embodiment of the present invention.

FIG. 2 is a simplified diagram showing a different embodiment of the present invention.

FIG. 3 is a simplified diagram showing a conventional example.

FIG. 4 is a simplified diagram showing a different conventional example.

[Explanation of symbols]

 1 Electrodeless discharge lamp 2 Bulb 3 Phosphor 4 Induction coil 5 High frequency generation circuit 6 Mercury dispenser 7 Stem 8 Support wire 9 Base part

Claims (1)

[Claims for utility model registration] [Claim 1] By an induction electromagnetic field generated by winding an induction coil in the vicinity of a translucent bulb in which a discharge gas is sealed and applying a high-frequency current to the induction coil. In an electrodeless discharge lamp that discharges and emits the discharge gas, a mercury dispenser is arranged in the bulb such that its flat plate surface is substantially perpendicular to the circumferential surface of the induction coil. Discharge lamp.