JPS6224934Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention consists of disposing an inner tube with a phosphor layer formed on the inner surface inside the outer tube for each electrode, and forming a U-shaped discharge path with the inner tube. Regarding discharge lamps.

This type of discharge lamp is disclosed in US Pat. No. 2,561,868. FIG. 1 is a perspective view showing an example of the discharge lamp using four inner tubes.
That is, in the figure, reference numeral 1 denotes an elongated cylindrical outer tube made of glass, and mercury and a rare gas, which are ionizable media, are sealed inside at low pressure. 2 is provided inside this outer tube 1 along the longitudinal direction of the outer tube 1.
The inner tube 2 has a phosphor layer 3 that serves as a light emitting layer on its inner surface, and an electrode 4 is provided at one end located at the bottom of the outer tube 1.
is sealed, and the other end located at the tip of the outer tube 1 is open. 5 is a lead wire that supports the electrode 4;
One end is led out to the outer tube 1 through the bottom of the outer tube 1. The electrode 4 is connected to the starter 6 via one of the lead wires 5 led out of the outer tube 1,
Further, the other lead wire 5 is connected to a power source 8 via a chain yoke 7. And starter 6
When the starter 6 is closed, the electrode 4 is preheated, and when the starter 6 is opened, a U-shaped discharge path A shown by a broken line is formed by the induction kick, and the starter is operated.

In the discharge lamp configured in this manner, the inner tube 2 that regulates the discharge path A is a conventional straight tube discharge lamp divided into two parts and arranged so that the electrodes 4 are close to each other. Therefore, since the inner tube 2 has a linear shape, manufacturing is easy, and the outer tube 1 can be made more compact while preventing a decrease in efficiency. However, since the discharge lamp described above is made by bundling inner tubes 2 having the same diameter into a substantially rectangular outer shape, the light emitted from the side cannot fully utilize the light from the inner tube 2 located at the rear. However, there was a problem in that it was not possible to meet the demands, especially when trying to obtain high output light from a specific side.

This idea was devised in view of the above points, and the diameter of the inner tube provided on one or more pairs of electrodes disposed inside the outer tube is adjusted to the diameter of the inner tube provided on one side of each pair of electrodes. It is an object of the present invention to provide a discharge lamp which is made to have a diameter smaller than that of the one provided on the other side, and is capable of emitting high-output light to a specific side.

An embodiment of this invention will be described below with reference to FIG. In the figure, 1 is a cylindrical outer tube with mercury and rare gas sealed inside, 4 is two pairs of electrodes sealed to the bottom of the outer tube 1 so as to face each other,
Reference numeral 2 designates four inner tubes arranged so that the lines connecting the centers of each of the electrodes 4 form a rectangular shape, and one end encloses the electrode 4 and other electrodes 4 so as not to short-circuit the discharge. The other end is open. Furthermore, the diameter of the inner tube 2 provided on one side of each pair of electrodes 4 is smaller than the diameter of the inner tube 2 provided on the other side of the electrodes 4. Note that everything other than the above is the same as that shown in FIG.

In the discharge lamp configured in this manner, the inner tubes 2 with a large diameter are arranged side by side with the inner tubes 2 with a large diameter facing in the same direction, respectively. Therefore, a part of the large-diameter inner tube 2 is exposed behind the small-diameter inner tube 2, so the light irradiated outward from the small-diameter inner tube 2 side is The direct light from the large-diameter inner tube 2 that is not lost by the tube 2 is also added, and the conventional inner tube 2 with the same diameter
It has a higher light output than one that is installed in parallel. In this case, it is possible to meet the demand for obtaining high light output especially in a specific side direction of the discharge lamp, but for example, as shown in FIG. By arranging them respectively, it is possible to increase the overall light output in each side direction. Furthermore, although the above embodiment has been described with reference to four inner tubes 2, it is obvious that the present invention can also be applied to structures having two or more than four inner tubes.

This idea was constructed as explained above, so
The light output of the discharge lamp can be improved in a specific lateral direction,
It is possible to provide a discharge lamp with increased freedom of use.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a conventional discharge lamp, and FIG. 2 is a perspective view showing an embodiment of the discharge lamp according to this invention.
FIG. 3 is a perspective view of an inner tube showing another embodiment of this invention. In the figure, 1 is an outer tube, 2 is an inner tube, 3 is a phosphor layer, and 4
are electrodes, and the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] One or more pairs of electrodes are sealed and opposed to each other at the bottom of an outer tube filled with mercury and a rare gas, and an inner tube is provided for each electrode with a phosphor coated on its inner surface. In the case where a U-shaped discharge path is formed through the tip of the inner tube between the electrodes, the diameter of the inner tube provided on one side of each pair of electrodes is larger than the diameter of the inner tube provided on the other side. A discharge lamp characterized by being thin.