JPS6241362B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a discharge lamp device that can obtain desired light distribution characteristics.

Conventionally, as a discharge lamp device capable of obtaining desired light distribution characteristics, there is a reflective fluorescent lamp shown in Fig. 1, in which a reflective film b is applied to about two-thirds of the inner peripheral area of the tube wall of the fluorescent lamp a.
The inner surface of the reflective film b and the reflective film b
The phosphor layer C was coated on the inner circumferential surface portion of the tube wall which was not coated.

In such a reflective fluorescent lamp, after the light is multiple-reflected by the reflective film b, the light is emitted outward from the fluorescent lamp a from the part where the reflective film b is not covered, so that the light can be reflected in a desired direction ( In the figure, the luminous intensity was almost twice as much as normal (downward in the figure), but due to multiple reflections of light within the tube, some of the light was absorbed by the tube wall or the reflective film B and the phosphor layer C, and the reflective film The drawback was that the luminous efficiency was 15 to 20% lower than that of general fluorescent lamps that did not have B. In addition, since the light distribution characteristics are determined by the deposition position and deposition area of the reflective film b,
Once a fluorescent lamp was manufactured and attached to a fixture, it was impossible to change the light distribution characteristics without rotating the lamp.

The present invention has been made in view of the above-mentioned drawbacks.
The purpose is to provide a lighting device that has better luminous efficiency than a general discharge lamp, can obtain desired light distribution characteristics, and can easily change the light distribution characteristics.

The present invention will be explained below based on embodiments shown in the figures.

FIG. 2 shows one embodiment of the present invention, and in the figure, 1 is a fluorescent lamp which is a discharge lamp;
Outside the caps 2, 2 at the ends of the tube are N poles 3a and S poles 3b of magnets, which are magnetic field generating means for generating a magnetic field parallel to the electric field of the fluorescent lamp 1 and distributed unevenly within the tube. The north pole 3a and the south pole 3b are removable in order to change the amount of magnetism received at a predetermined position within the fluorescent lamp 1. Note that 4 in the figure indicates lines of magnetic force.

In this embodiment, since a magnetic field is applied in the same direction as the electric field, charged particles that are about to move toward the tube wall are caused to move circularly around the tube axis due to the magnetic field, and are separated from positively charged ions near the tube wall. The probability of recombination becomes extremely small, and as a result, the degree of difficulty for electrons to pass through the area where there is a magnetic field (hereinafter referred to as discharge impedance) becomes extremely small compared to the lower part of the figure where there is almost no magnetic field, and therefore the magnetic field The discharge occurs only in the portion where the tube wall exists, and almost only the upper portion of the tube wall in the figure emits light. On the other hand, N pole 3a and S pole 3
When each of b is removed, the influence of the magnetic field disappears inside the tube, and the entire tube wall emits light.

Note that the magnetic receiving amount variable means does not have to be a means for attaching and detaching a magnet, and may be any means as long as it changes the state of the magnetic field applied to the discharge lamp. For example, when the fluorescent lamp 1 is fixed By moving the magnet along the outer surface of the tube end of the fluorescent lamp 1,
The amount of magnetism received at a predetermined position within the pipe may be changed,
By using a magnetic field generating means whose intensity is variable, the magnetic field generating means may also serve as a receiving amount variable means. Furthermore, the magnetic field generating means may of course be provided within the tube of the discharge lamp.

As described above, the present invention provides a magnetic field generating means, a discharge lamp which receives a non-uniform magnetic field within the tube in a direction parallel to the electric field by the magnetic field generating means, and a method of changing the strength of the magnetic field at a predetermined position within the discharge lamp. Since it is composed of a magnetic field variable means, it is possible to change the discharge path within the discharge lamp tube more clearly than when applying a magnetic field in a direction that intersects with the electric field, and the light distribution characteristics can also be easily set. Instead, the discharge path is biased, and the loss of ultraviolet rays, etc., which conventionally occurs due to reflection, is reduced, and the luminous efficiency is significantly increased.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a conventional reflective fluorescent lamp. FIG. 2 is a partially omitted perspective view showing an embodiment of the present invention. a... Fluorescent lamp, b... Reflective film, c... Fluorescent layer,
1...Fluorescent lamp, 2...Base, 3a...N pole, 3b...S
Pole, 4... lines of magnetic force.

Claims (1)

[Claims] 1. A magnetic field generating means, a discharge lamp which receives a non-uniform magnetic field within the tube in a direction parallel to the electric field by the magnetic field generating means, and a receiving amount variable means for changing the strength of the magnetic field at a predetermined position within the discharge lamp. A discharge lamp device consisting of