JPH02197001A - Electrodeless discharge lamp apparatus - Google Patents

Abstract

PURPOSE:To stabilize operation by a method wherein a discharge vessel and an induction coil constituting an electrodeless discharge lamp are mounted on a lamp unit so that they are longitudinally movable while a plate body comprising a metallic conductor which longitudinally moves interlockingly with the above components is provided closely to the coil so that a distance between the coil and the plate body is constant irrespective of the lamp position. CONSTITUTION:A translucent discharge vessel 2 with discharge gas sealed and an induction coil 3 wound around its outer periphery comprise an electrodeless discharge lamp 1, which is fixed with adhesive 5 to a plate body 4 made of a metallic conductor. The plate body 4 is mounted on a lamp unit 7 so that it can be moved longitudinally via a vertical position adjusting means 6 comprising a rack, a pinion, etc., while the plate body 4 provided below the coil 3 is moved longitudinally interlocked with longitudinal motion of the lamp 1. This therefore allows position adjustment of the lamp 1 without changing relative distance of the lamp 1 and the coil 3 with respect to the plate body 4, stabilizing output in the lamp unit 6 and an installed high frequency oscillation circuit 8 to supply it to the coil 3.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electrodeless discharge lamp device that does not have an electrode inside the lamp and uses a high-frequency electric field from the outside to cause a discharge body inside the lamp to discharge and emit light.

[Prior Art] Conventionally, fluorescent lamps have been provided in which mercury atoms are excited by arc discharge to emit ultraviolet rays, and visible light is obtained by irradiating a phosphor layer with the ultraviolet rays. , this type of fluorescent lamp has a relatively short life and low efficiency. To solve this problem, electrodeless discharge lamps with longer lifespan and higher efficiency have been proposed for about 10 years, and are disclosed, for example, in Japanese Patent Application Laid-open No. 78766/1983. In this lamp, a high-frequency current is applied to an induction coil disposed close to a discharge vessel enclosing a discharge body, and the generated induced electric field causes the discharge body inside the discharge vessel to discharge and emit light.

Further, according to an electrodeless discharge lamp disclosed in Japanese Patent Application Laid-Open No. 61-71957, as shown in FIG. Therefore, the light emitting surface area of the lamp 1 is small, making it possible to create a compact and high-intensity light source, which also has the features of long life and high efficiency, and can be combined with optical lens globes, etc., such as traffic signal lights, aviation obstruction lights, etc. This lamp is effective as an indicator light like a guide light.

By the way, in indicator lights combined with the above lens system, the normal position of the lamp within the lamp is strictly regulated due to the optical design of the lens, and if the lamp position deviates from the optical center, the alignment through the lens will change. The light distribution is not as specified. Therefore, as shown in FIG. 3, the lamp used in such an indicator light has a mechanism (for example, a rank and signion mechanism) that can finely adjust the position of the lamp 1 up and down.
6 is provided.

[Problems to be Solved by the Invention] However, in this device, the lamp 1 has an integral structure of the bulb 2 and the coil 3, so when the lamp 1 is lowered, the coil 3 is also lowered accordingly. Here, the upper surface part 7a of the lamp main body 7 is close to the lower part of the coil 3, and the material of the upper surface part 7a is such that a high-frequency oscillation circuit generated from a circuit part 8 such as a high frequency oscillation circuit arranged in the lamp main body 7 is used. Metal conductors are usually used in consideration of leakage noise, heat dissipation, heat resistance, etc. Therefore, when the coil 3 approaches the upper surface portion 7a, the self-inductance of the induction coil 3 decreases,
This has led to problems such as an increase in loss, a decrease in the efficiency of the entire device, and a significant impact on startability and the like.

The present invention was made in view of the above-mentioned problems, and its purpose is to operate stably without changing the electrical characteristics even if the positional relationship between the coil and the lamp body changes when adjusting the lamp position. An object of the present invention is to provide an electrodeless discharge lamp device that does not adversely affect the efficiency, startability, etc. of the entire device.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention has an induction coil wound around the outer periphery of a translucent discharge vessel in which a discharge body is enclosed, and a high-frequency oscillation circuit disposed inside the lamp body. In an electrodeless discharge lamp device in which the discharge body is discharged and emitted light by an induced electric field generated by passing an output high-frequency current through the induction coil, the discharge vessel and the induction coil are adjusted by vertical position adjustment means. A plate-shaped body made of a metal conductor is attached to the lamp body in a vertically movable manner and moves vertically in conjunction with the adjustment of the position adjustment means, and is disposed close to the induction coil. be.

[Embodiment] Fig. 1 shows an embodiment of the present invention, in which numeral 1 indicates a translucent discharge vessel 2 in which a discharge electric body is enclosed, an induction coil 3 wound around the outer periphery of the discharge vessel 2, and numeral 1 in the figure. The lamp 1 is fixed to a plate-shaped body 4 made of a metal conductor via an adhesive 5 or the like, and the plate-shaped body 4 is equipped with a well-known vertical position adjustment means 6 such as a rack and pinion mechanism. It is attached to the lamp main body 7 so as to be movable up and down via. In other words, as the lamp 1 moves up and down, the plate-like body 4 provided at the bottom of the coil 3 moves up and down. Therefore, the position of the lamp can be adjusted without changing the relative distance of the lamp 1 and coil 3 to the plate-like body 4. Note that the distance between the coil () wound around the lamp 1 and the plate-like body 4 depends on the diameter of the coil 3, that is, the diameter of the bulb 1 and the electric power, but according to experimental results, the distance between If it is designed to move up and down while maintaining a distance, the loss in the plate-shaped body 4 will not reduce the efficiency of the entire device and will not adversely affect the startability.

Note that a circuit section 8 such as a high frequency excavation circuit is disposed within the lamp body 6, and its output is supplied to the coil 3.

[Effects of the Invention] As described above, in the electrodeless discharge lamp device according to the present invention, the discharge vessel and the induction coil constituting the electrodeless discharge lamp are mounted on the lamp body so as to be vertically movable via the vertical position adjustment means. In addition, by disposing a plate-shaped body made of a metal conductor that moves up and down in conjunction with the adjustment of the position adjustment means in close proximity to the induction coil, the distance between the coil and the plate-shaped body can be adjusted depending on the lamp position. Since the distance between the two lamps is maintained constant, the electrical characteristics do not change, a stable amount of light can be obtained, and problems such as a decrease in efficiency of the entire device and deterioration in lamp startability do not occur. Therefore,
The present invention is particularly effective when used in combination with optical lens systems such as indicator lights.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional front view showing an embodiment of the present invention, FIG. 2 is a perspective view of a conventional example, and FIG. 3 is a partially sectional front view of the conventional example. DESCRIPTION OF SYMBOLS 1... Lamp, 2... Discharge vessel, 3... Induction coil, 4... Plate-shaped body, 6... Vertical position adjustment means, 7...
・Lighting body.

Claims (1)

[Claims] (1) An induction coil is placed around the outer periphery of a translucent discharge container that encloses a discharge element, and a high-frequency current output from a high-frequency oscillation circuit arranged inside the lamp body is passed through the induction coil. In an electrodeless discharge lamp device in which the discharge body discharges and emits light by an induced electric field, the discharge vessel and the induction coil are mounted on the lamp body so as to be vertically movable via a vertical position adjustment means, and the An electrodeless discharge lamp device, characterized in that a plate-like body made of a metal conductor that moves up and down in conjunction with adjustment is disposed close to the induction coil.