JPS5842158A - Single base type discharge lamp - Google Patents

Abstract

PURPOSE:To make it usable as good as an incandescent lamp despite a small and simple type in structure and secure longer service life than the incandescent lamp, besides less power consumption, by setting up a heater and an anode at short intervals in opposition to a bulb sealed up with mercury and a noble gas, while coating phosphor substances on the inside of the bulb. CONSTITUTION:A heater 5 composed of a filament, which is coated with electron radiation substances (an oxide comprising barium, strontium, calcium, and so on) is strainedly connected to the tips of lead wires 4a and 4b in a bulb 1 which seals up mercury and a noble gas and being coated with phosphor substances including calicium halophosphate. Also this heater 5 is oppositely attached to an anode 7. The lead wire 4a is connected to a base pin 9a via a ballast 8 and the lead wire 4b to a base pin 9b in the same manner while a lead wire 6 is connected to a base pin 9c via a ballast 10, respectively. When a current is made to flow with a switch 12 turned on, the heater 5 is incandesced so that thermionic emission to an anode 7 takes place.

Description

[Detailed description of the invention] The present invention relates to a single-end discharge lamp.

Conventionally, there are no hot cathode type, low pressure mercury vapor discharge lamps on the market that have a low operating voltage and have a single-end type like incandescent light bulbs. Therefore, if a compact type discharge lamp with a low working voltage and a single-end mold were developed, it would take up less space to install, have a longer lifespan than an incandescent lamp, and consume less power. This should greatly expand its range of applications.

The purpose of this invention is to propose exactly this kind of single-ended discharge lamp, and one embodiment thereof will be explained below in detail based on the drawings. 1 is a light bulb coated with a fluorescent substance such as calcium halophosphate on the inside and filled with a small amount of mercury and a rare gas such as argon; 2 is fixed to one end of the light bulb 1; It is a cap. A stem 3 is secretly installed inside the light bulb 1, and the tips of lead wires 4a and 4b protruding from the stem 3 are filled with an electron radioactive material (an oxide mainly composed of barium, strontium, calcium, etc.). ) A heater 5 made of a filament coated with
An anode 7 is attached to its tip so as to face the heater 5. And the lead lfM4a is the stabilizing resistor 8
The lead wire 4b is connected to the cap pin 9a through the cap pin 9b.
Further, the lead wire 6 is connected to the cap pin 9c via a stabilizing resistor 10.

Therefore, as shown in Figure 2, a DC power supply (24cm
) to the + side of lead wire 4a.

6. When the cap pins 9a and 9c are connected, the switch 12 is turned on, and a current is applied, the heater 5 becomes red hot, and thermionic electrons are emitted from the negative side toward the anode 7. Thermionic electrons collide with evaporated mercury vapor to generate ultraviolet rays of 2°537A, which collide with fluorescent substances to produce visible light, which is emitted to the outside. Therefore, if the generated ultraviolet rays are directly radiated to the outside without hitting the fluorescent material, a germicidal lamp can be obtained. Discharge lamps include germicidal lamps.

Figure 3 shows a circuit diagram when AC is used as the power source 1. The lead wire 6 on the anode 7 side is connected to the AC power source via a full-wave rectifier circuit 13 or a half-wave rectifier circuit. In this case, full-wave rectification has the advantage of reducing light flickering.In either case, thermionic electrons are emitted alternately from the left and right sides of the heater 5.

Normally, double-ended discharge lamps have a large gap between the cathode and the anode, and the filament (heater) is heated red-hot by the power supply voltage at the start of discharge. is maintained.

On the other hand, in the device according to the present application, the distance between the cathode and the anode is extremely small, and the heater current is constantly maintained to make the heater red hot.

Therefore, even if the discharge start is as low as 247, the discharge is easily carried out, and once the discharge is started, the sustaining voltage is 15~
It becomes even lower at 16'''r.

In the examples, the diameter of the light bulb was 19 mm to 20 mm, and the diameter of the heater was 0.02 to 20 mm.
mm was used. When used as a fluorescent lamp, it is possible to emit light in a variety of colors, such as red, green, and blue, by changing the fluorescent substance. Further, the shape of the anode electrode and the opposing position thereof are not limited to those in the embodiment, and the heater may be passed through a ring-shaped anode electrode, for example.

Furthermore, the base may be of a screw type like a normal incandescent light bulb, and the lead wire 4a16 may be connected thereto.

As explained in detail above, according to the present invention, it has a small and simple structure and can be used in the same way as an incandescent light bulb, and since the heater temperature is low, the lifespan is longer than that of an incandescent light bulb. The feature is that it lasts a long time and consumes less power? have

[Brief explanation of drawings]

1... Light bulb 2... Base 3...
...Stem 4a, 4b...Lead wire 5a...
・・Heater 6・−・・Lead wire 7・Φ・
...Anode patent applicant Miko 90 Electric Machinery Patent Office Commissioner Haruki Shimada 1 Case description Showa 56 Relationship to patent application No. 141409 Applicant address Mr. 5-29-15 Tokumaru, Itabashi-ku, Tokyo Name name Mini Pyro Electric Co., Ltd. 4, Agent Address: 171 263-

Claims (1)

[Scope of Claims] 1. A heater and an anode are provided at one end of a light bulb filled with J> amounts of mercury and a rare gas such as argon, facing each other at a short interval, and a voltage is applied to the anode while energizing the heater. A single-end discharge lamp characterized in that it is made to 2. The single-end discharge lamp according to claim 1, wherein the bulb further has a fluorescent substance coated on its inner surface.