JPH0118539B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a discharge lamp device, and an object thereof is to provide a discharge lamp device in which the light distribution or emission color can be easily changed.

Figures 1 and 2 show an example of a discharge lamp used in the present invention. The discharge lamp is composed of an inner tube 1 and an outer tube 2 made of glass, and each end of the inner tube 1 has a flared shape. A stem portion 3 is integrally formed, and two lead-in wires 4 are enclosed in the stem portion 3, and a filament 5 coated with an electrode material is supported on the lead-in wires 4. The inner diameter of the outer tube 2 is approximately the same as the outer diameter of the stem portion 3, and a phosphor is coated on the inner surface as necessary. Then, the inner tube 1 is inserted into the outer tube 2, and the end edge of the outer tube 2 and the peripheral edge of the stem portion 3 of the inner tube 1 are sealed.

FIG. 3 shows an embodiment of the present invention, in which a phosphor 6 is coated on the inner surface of the outer bulb 2 of the discharge lamp as described above, and the airtight space formed by the outer bulb 2 and the inner bulb 1 is filled with a phosphor 6. is filled with several Torr of inert gas and an appropriate amount of mercury. Further, a rod-shaped magnetic field generator 7 is disposed in the cavity A of the inner tube 1, and the magnetic field generator 7 applies a magnetic field that intersects the lamp axis.

FIG. 4 is a diagram developed along the discharge space formed by the inner tube 1 and the outer tube 2, in order to explain the discharge state of the lamp according to the present invention. Although not shown, a filament 5 is supported. A well-known lighting device is connected to the lead-in line 4.

Since the magnetic field generating device 7 applies a magnetic field perpendicular to the discharging plasma, that is, perpendicular to the direction of the electric field,
Since the plasma is deflected by the Lorentz force and is fixed at the positions of the electrodes 5, the discharge state is as shown by area B in FIG.
Therefore, by operating the magnetic field generator 7 and changing the strength of the applied magnetic field, or by rotating the magnetic field generator 7 around the tube axis, that is, by appropriately deflecting the plasma, any light distribution can be achieved. can be obtained. Further, by forming the phosphor 6 applied to the inner surface of the outer tube 2 into a plurality of phosphors emitting different colors along the tube axis direction, a variable color lamp can be easily provided. It goes without saying that two types of light distribution can be obtained by controlling the magnetic field generator 7 on and off.

Next, FIGS. 5 and 6 show different embodiments of the present invention, and the difference from the above embodiment is that the electrodes, which were a pair in the above embodiment, are arranged in multiple pairs at approximately equal intervals (Fig. In this case, the electrodes 5a, 5b, 5c, and 5d are connected in parallel as shown in FIG. The explanation will be omitted by adding .

In such an embodiment, when trying to obtain an arbitrary light distribution, the lamp is turned on and the magnetic field generator 7 generates a magnetic field so that discharge occurs at an arbitrary location, or if the magnetic field generator 7 is a permanent magnet, , the discharge is moved to a desired location by rotating the magnetic field generator 7 around the tube axis. In addition, when trying to obtain a variable color lamp, the phosphor coated on the inner surface of the outer tube 2 is a plurality of phosphor strips emitting different colors along the tube axis direction, and each of the electrodes 5a ，
5b, 5c, and 5d, and a discharge is caused in the portion coated with the phosphor of the desired color. Such a case can also be achieved by controlling the magnetic field generating device 7 in the same manner as described above, or by keeping the magnetic field generating device 7 fixed and rotating the lamp around the tube axis.

Next, the state of discharge deflection according to the above embodiment will be explained based on FIG. 6. First, the discharge that initially occurred between the pair of electrodes 5a and 5b (area B ₁ surrounded by a dotted line in the figure) is caused by the magnetic field applied to deflect the discharge, and the discharge is changed to an area B ₂ surrounded by a dotted line in the figure due to the magnetic field applied to deflect the discharge. Deflect as in An electrode 5b connected in parallel with the electrode 5a exists near the discharge area _B2 . By the way, if we think about maintaining the discharge, the discharge will be stabilized at the point where the energy required to maintain the discharge is the minimum, so the discharge that was occurring between the electrodes 5a and 5a will be reduced to the electrodes 5b and 5a. 5b (region B ₃ surrounded by a solid line in the figure). Therefore, compared to the embodiments described above, there is an advantage that the light distribution or the luminescent color can be changed more clearly.

As described above, the present invention includes an inner tube and an outer tube arranged in a concentric cylindrical shape, an airtight space formed between the inner tube and the outer tube as a discharge space, and at least one pair of electrodes at both ends of the discharge space. A discharge lamp equipped with
A discharge lamp device comprising a rod-shaped magnetic field generating device disposed in the cavity of the inner tube, wherein the magnetic field generating device is characterized in that the direction of the magnetic field is perpendicular to the direction of the electric field. Therefore, it is possible to provide a discharge lamp device that can easily obtain arbitrary light distribution.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view showing an example of a discharge lamp used in the present invention, FIG. 2 is a perspective view of the same as above, and FIG. 3 is a partially cutaway front view of an embodiment of the present invention. b is a sectional view, FIG. 4 is a simplified diagram developed along the same discharge space, FIG. 5 is a sectional view showing a different embodiment of the present invention, and FIG. 6 is a simplified diagram developed along the same discharge space. It is a diagram. 1... Inner tube, 2... Outer tube, 5... Electrode, 6...
Fluorescent material, 7...Magnetic field generator, A...Cavity part.

Claims (1)

[Claims] 1. A discharge lamp in which an inner tube and an outer tube are arranged in a concentric cylindrical shape, the airtight space formed between the inner tube and the outer tube is a discharge space, and at least one pair of electrodes are arranged at both ends of the discharge space. and a rod-shaped magnetic field generator disposed in the cavity of the inner tube, wherein the magnetic field generator has a direction of magnetic field perpendicular to the direction of the electric field. Characteristic discharge lamp device.