JP4575842B2 - Light bulb shaped fluorescent lamp - Google Patents

Description

  The present invention relates to a light bulb-type fluorescent lamp. Specifically, mercury and a rare gas are enclosed inside, both ends are closed, and a tubular bulb (an arc tube) having a phosphor coating on the inner surface is formed. The present invention relates to a bulb-type fluorescent lamp of an external electrode type in which external electrodes are provided on the outer surfaces of both ends of a tubular bulb.

  Conventionally, for example, a cover having a base that can be attached to a socket of a general lighting bulb such as an incandescent bulb is provided, and a lighting circuit is housed inside the cover, and a bent arc tube having a U-shape, a double spiral shape, or the like. There is known a bulb-type fluorescent lamp in which is stored in an outer tube glove.

  FIGS. 6A and 6B are diagrams showing a light bulb-type fluorescent lamp 1 using a conventional U-shaped arc tube, in which FIG. 6A is a lamp structure diagram through which the inside is seen, and FIG. As shown in FIG. 6 (a), the bulb-type fluorescent lamp 1 includes an arc tube 2 composed of three U-shaped bulbs, a high-frequency lighting circuit 3 for lighting the arc tube 2, and a high-frequency lighting circuit. 3, a cover 4 having a base 5, an outer tube globe 6 covering the arc tube 2, and electrodes 7 made of filaments at both ends of the arc tube 2.

  FIG. 7 is a development view of the arc tube of the bulb-type fluorescent lamp 1 using a U-shaped arc tube. As shown in FIG. 7, the electrodes 7 at both ends in the arc tube 2 are provided with filaments that are heated when the bulb-type fluorescent lamp 1 is started to emit thermoelectrons. Moreover, since the light-emitting fluorescent lamp 1 has the arc tube 2 housed in the outer tube globe 6, the temperature of the arc tube during lighting is significantly higher than that of a general fluorescent lamp. Since the luminous efficiency of the fluorescent lamp depends on the vapor pressure of mercury sealed inside, the efficiency decreases at such a high temperature. In order to suppress the decrease in efficiency, a mercury alloy (main amalgam 8 and auxiliary amalgam 9) is sealed inside the arc tube 2. Amalgam controls mercury vapor pressure lower than pure mercury. By using the amalgam selected according to the arc tube temperature, the maximum efficiency can be obtained even at high temperatures in the outer tube globe 6.

  FIGS. 8A and 8B are diagrams showing a bulb-type fluorescent lamp 1 using a conventional double spiral arc tube 2a. FIG. 8A is a lamp structure diagram through which the inside is seen, and FIG. In FIG. 8A, a double spiral arc tube 2a is used as the arc tube. The rest is the same as the bulb-type fluorescent lamp 1 using the U-shaped arc tube in FIG. The bulb-type fluorescent lamp 1 using the double spiral arc tube 2a has the advantage that the distance between the electrodes in the arc tube can be made longer in a fixed space than the arc tube in which a plurality of U-shaped glass tubes are combined. Furthermore, by narrowing the glass tube constituting the arc tube and narrowing the gap between adjacent glass tubes in the direction of the pivot axis to about 1 mm, the arc tube itself can be rotated around the pivot axis without extending the entire length. The number of turns for turning can be increased. As a result, the distance between the electrodes in the arc tube can be increased, and brightness equivalent to that of an incandescent bulb can be obtained.

FIG. 9 is a longitudinal sectional front view of a conventional external electrode type fluorescent lamp 10. In this fluorescent lamp 10, the phosphor 13 is applied to the inner surface of the glass tube 11 except for both end portions facing each other in the tube axis direction, and a pair is formed on the outer surface of the glass tube at the opposite end portions where the phosphor 13 does not exist. The external electrode 14a and the external electrode 14b are provided. A discharge gas 12 such as a rare gas or a metal vapor is sealed inside the glass tube 11, and a high frequency voltage is applied to the pair of external electrodes 14a and external electrodes 14b provided on the outer surface of the glass tube to discharge the gas inside the tube, The ultraviolet rays generated thereby are converted into required visible light by the fluorescent substance. A high electrode drop voltage for maintaining discharge is generated on the inner surfaces of the external electrode 14a and the external electrode 14b, and electrons and ions accelerated by the voltage collide with the inner surface of the glass tube 11. Since 13 does not exist, no severe deterioration occurs. However, there is no mention about application to a bulb-type fluorescent lamp (see, for example, Patent Document 1).
JP-A-1-231260

  Since the conventional bulb-type fluorescent lamp 1 is formed in a larger outer shape than a general lighting bulb, further downsizing is desired. In order to reduce the size, the arc tube 2 is made into a complicated bent structure by using a glass tube with a thin tube diameter as much as possible. However, there are indispensable electrodes 7 at both ends inside the arc tube 2, and because of these electrodes 7, it is impossible to reduce the size of the tube.

  Usually, the electrode 7 inside the arc tube 2 is a hot cathode in which an oxide thermoelectron emitting material is applied to a filament, and therefore, each electrode 7 requires two lead wires. In addition, in order to obtain a sufficient life, a sufficient amount of thermionic emission material is necessary, and for this purpose, the size of the filament cannot be reduced unnecessarily. When the electrode 7 touches the inner wall of the arc tube 2, the characteristics become abnormal or breakage. Therefore, it is necessary to prevent the electrode 7 from touching the inner wall of the arc tube 2, and it is difficult to reduce the tube diameter. Moreover, in order to make it strong against blinking, it is necessary to preheat the filament before lighting (about 1 second). For this reason, even if it is switched on, it does not light up immediately, and it is weaker to blink than a light bulb. Further, the structure of the high-frequency lighting circuit 3 becomes complicated due to the preheating.

  The present invention has been made to solve the above-described problems. By adopting an external electrode system, the manufacturing is easy, and the arc tube can be made thin, so that it can be miniaturized, has a long life and is strong against flashing. An object of the present invention is to provide a light bulb-type fluorescent lamp that can be turned on instantaneously, has a simple lighting circuit, and is small and inexpensive.

  The bulb-type fluorescent lamp according to the present invention is provided with an arc tube in which mercury and a rare gas are enclosed and closed at both ends, and a phosphor film is formed on the inner surface, and provided on the outer surfaces of both ends of the arc tube. A pair of external electrodes, an insulating member provided outside the arc tube and electrically insulating the pair of external electrodes, a high-frequency lighting circuit for lighting the arc tube, a high-frequency lighting circuit, and a base And a cover having an outer tube glove covering the arc tube.

  Further, the bulb-type fluorescent lamp according to the present invention has a double spiral shape in which mercury and a rare gas are sealed inside, both ends are closed, a phosphor film is formed on the inner surface, and both ends are located at a predetermined interval. An arc tube, a pair of external electrodes provided on the outer surfaces of both ends of the double spiral arc tube, a high frequency lighting circuit for lighting the double spiral arc tube, a high frequency lighting circuit and a base And a cover having an outer tube globe covering the double spiral arc tube.

  The bulb-type fluorescent lamp according to the present invention includes an arc tube in which mercury and a rare gas are enclosed and closed at both ends, and a phosphor film is formed on the inner surface, and the arc tubes at both ends of the arc tube A pair of external electrodes provided on the outer surface excluding parts close to each other, a high-frequency lighting circuit for lighting the arc tube, a cover containing the high-frequency lighting circuit and having a base, and an outer tube covering the arc tube A glove is provided.

  Also, the bulb-type fluorescent lamp according to the present invention encloses mercury and a rare gas inside, closes both ends, forms a phosphor film on the inner surface, and prevents the U-shaped tubes that are end portions from adjoining each other. An arc tube formed by combining a U-shaped tube, a pair of external electrodes provided on the outer surfaces of both ends of the arc tube, a high-frequency lighting circuit for lighting the arc tube, and a high-frequency lighting circuit are housed. And a cover having a base and an outer tube glove for covering the arc tube.

  The bulb-type fluorescent lamp according to the present invention includes an arc tube in which mercury and a rare gas are sealed inside and closed at both ends, and a phosphor film is formed on the inner surface, and provided on the outer surfaces of both ends of the arc tube. A pair of external electrodes formed, a secondary electron emission material provided at a portion facing the external electrode on the inner surface of the arc tube, a high-frequency lighting circuit for lighting the arc tube, and a high-frequency lighting circuit; A cover having a base and an outer tube glove for covering the arc tube are provided.

  The bulb-type fluorescent lamp according to the present invention is easy to manufacture and can be downsized because the arc tube can be made thin by the above-described configuration, has a long life, resists flashing, can be instantaneously lit, and has a simple and compact lighting circuit. Can be made at a low price.

Embodiment 1 FIG.
1A and 1B are diagrams showing Embodiment 1, in which FIG. 1A is a front view of the inside of a light bulb-type fluorescent lamp 1 and FIG. 1B is a front view of the light bulb-type fluorescent lamp 1.
In FIG. 1, a bulb-type fluorescent lamp 1 includes an arc tube 2 in which three U-shaped tubes are joined, a high-frequency lighting circuit 3 for lighting the arc tube 2, a high-frequency lighting circuit 3, and a base. 5, the outer tube globe 6 covering the arc tube 2, the pair of external electrodes 14 a and 14 b provided on the outer surfaces of both ends of the arc tube 2, and the space between the external electrode 14 a and the external electrode 14 b. And an insulating member 20 that is electrically insulated outside the arc tube 2.

  The external electrode 14a and the external electrode 14b are formed by applying a conductive paste or attaching a metal tape (for example, aluminum or copper).

  The bulb-type fluorescent lamp 1 encloses a discharge gas such as a rare gas or a metal vapor (for example, mercury) inside the arc tube 2 (the gas pressure is 20 Torr to 100 Torr). (Not shown) is applied. A high frequency lighting circuit 3 applies a high frequency voltage of 1 kV to 3 kV at several tens of kHz to 150 kHz to the pair of external electrodes 14a and external electrodes 14b provided on the outer surfaces of both ends of the arc tube 2 to discharge the gas inside the tube, The ultraviolet rays generated thereby are converted into required visible light by the fluorescent substance.

  Since a high frequency voltage of 1 kV to 3 kV is applied between the external electrode 14a and the external electrode 14b at several tens of kHz to 150 kHz, when the distance between the external electrode 14a and the external electrode 14b is about 10 mm or less, the arc tube 2 Electrical insulation is necessary outside the door. As in the first embodiment, when the external electrode 14a and the external electrode 14b are close to each other, the electrical insulating member 20 is required between them.

According to the first embodiment, since there is no electrode (filament) inside the arc tube 2, it is easy to manufacture the bulb-type fluorescent lamp 1.
Moreover, since there is no electrode inside the arc tube 2, the arc tube 2 can be made thin (5-6 mm is also possible), and the bulb-type fluorescent lamp 1 can be miniaturized.
In addition, since the external electrode 14a and the external electrode 14b are used, the electrode is not consumed, has a long life and is strong against blinking.
Further, since preheating of the filament is unnecessary, instantaneous lighting is possible, and the high-frequency lighting circuit 3 is simple and inexpensive.

  Although the light bulb-type fluorescent lamp 1 using the arc tube 2 having a shape in which three U-shaped tubes are joined has been described, naturally the number is not limited to this.

Embodiment 2. FIG.
2A and 2B are diagrams showing a second embodiment, in which FIG. 2A is a front view of the inside of a bulb-type fluorescent lamp 1 using a double spiral arc tube 2a, and FIG. 2B is a double spiral arc tube 2a. It is a front view of the bulb-type fluorescent lamp 1 using
In FIG. 2, a bulb-type fluorescent lamp 1 includes a double spiral arc tube 2a, a high frequency lighting circuit 3 for lighting the double spiral arc tube 2a, a high frequency lighting circuit 3 and a base 5 The cover 4 has an outer tube globe 6 that covers the double spiral arc tube 2a, and a pair of external electrodes 14a and 14b provided on the outer surfaces of both ends of the double spiral arc tube 2a.

  As shown in FIG. 2, the double spiral arc tube 2a has a long distance between both ends outside the double spiral arc tube 2a, and is usually insulated when a high frequency voltage (1 kV to 3 kV) is applied. It is longer than the required 10 mm. Therefore, the insulating member 20 is unnecessary as in the above embodiment.

According to the second embodiment, in addition to the effects of the first embodiment, since the insulating member 20 is not necessary, the manufacturing is further facilitated.
Further, since the double spiral arc tube 2a is used, the bulb-type fluorescent lamp 1 can be further reduced in size.

Embodiment 3 FIG.
3A and 3B are diagrams showing the third embodiment, where FIG. 3A is a front view of the inside of the light bulb-type fluorescent lamp 1 and FIG. 3B is a front view of the light bulb-type fluorescent lamp 1.
Only the configuration of the external electrode is different from the first embodiment. As shown in FIG. 3, the external electrode 14c and the external electrode 14d have a configuration excluding a portion where the arc tubes 2 are close to each other. In other words, the external electrode 14c and the external electrode 14d are provided in a portion where the arc tubes 2 do not face each other. For example, the cross section of the external electrode 14c and the external electrode 14d is a shape close to a semicircle. By configuring the external electrode 14c and the external electrode 14d as described above, the insulating member 20 used in the first embodiment is not necessary.

  According to the third embodiment, in addition to the effects of the first embodiment, since the insulating member 20 is not necessary, the manufacturing is further facilitated and the cost can be reduced.

  In Embodiment 3, the bulb-type fluorescent lamp 1 using the arc tube 2 in which three U-shaped tubes are joined has been described, but the number is naturally not limited to this.

Embodiment 4 FIG.
FIG. 4 is a diagram showing the fourth embodiment, and is a plan view of the arc tube 2 of the bulb-type fluorescent lamp 1.
As shown in FIG. 4, the arc tube 2 has a shape in which three or more U-shaped tubes are arranged side by side and joined. Since the end of the arc tube 2 exists in the outer U-shaped tube, the external electrode 14a and the external electrode 14b are also formed in the outer U-shaped tube. Therefore, the distance between the external electrode 14a and the external electrode 14b is sufficiently longer than 10 mm that requires insulation when a high-frequency voltage (1 kV to 3 kV) is applied, and the insulating member 20 used in the first embodiment is unnecessary. is there.

  In the fourth embodiment, the arc tube 2 is formed by combining the U-shaped tubes so that the U-shaped tubes that are the end portions are not adjacent to each other. Therefore, the insulating member 20 is not necessary, the manufacturing is easy, and the low Can be priced.

Embodiment 5 FIG.
FIG. 5 shows the fifth embodiment, and is a side sectional view in the vicinity of one end portion (external electrode 14a) of the arc tube 2. FIG.
In FIG. 5, the arc tube 2 has a phosphor 13 coated on the inner surface of a glass tube 11 and a secondary electron emission material 21 (for example, alumina) coated on the inner surface of the glass tube 11 facing the external electrode 14a. Yes. Similarly, on the external electrode 14b side, the secondary electron emission material 21 is applied to the inner surface of the glass tube 11 facing the external electrode 14b.

  Thus, the secondary electron emission material 21 is applied to the inner surface of the glass tube 11 facing the external electrode 14a and the external electrode 14b, and the external electrode 14a and the external electrode 14b are applied to the tens of kHz to 150 kHz by the high-frequency lighting circuit 3. When a high-frequency voltage of 1 kV to 3 kV is applied to discharge the gas inside the tube, secondary electrons are emitted from the secondary electron emitting material 21 and are evaporated in the glass tube 11 and collide with mercury atoms that are in the form of gas. This collision causes mercury atoms to generate ultraviolet rays. When this ultraviolet light hits the phosphor 13 applied to the inner surface of the glass tube 11, it changes to visible light.

  Thus, by applying the secondary electron emission material 21 to the inner surface of the glass tube 11 facing the external electrode 14a and the external electrode 14b, secondary electrons are emitted and the light output of the arc tube 2 is increased. Can do.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows Embodiment 1, (a) is the front view which saw through the inside of the lightbulb-type fluorescent lamp 1, (b) is a front view of the lightbulb-type fluorescent lamp 1. FIG. FIG. 5 is a diagram showing the second embodiment, in which (a) is a front view of the light bulb-type fluorescent lamp 1 using a double spiral arc tube 2a, and (b) is a diagram showing a double spiral arc tube 2a. 1 is a front view of a bulb-type fluorescent lamp 1. FIG. FIG. 4 is a diagram showing the third embodiment, where (a) is a front view seen through the interior of the bulb-type fluorescent lamp 1, and (b) is a front view of the bulb-type fluorescent lamp 1. FIG. 10 is a diagram showing the fourth embodiment, and is a plan view of the arc tube 2 of the bulb-type fluorescent lamp 1. FIG. 6 is a diagram showing the fifth embodiment, and is a side cross-sectional view in the vicinity of one end portion (external electrode 14a) of the arc tube 2. FIG. It is a figure which shows the light-bulb-type fluorescent lamp 1 using the conventional U-shaped arc tube, (a) is the lamp | ramp structure figure which permeate | transmitted the inside, (b) is a lamp external view. It is the arc tube development view of the bulb-type fluorescent lamp 1 using the U-shaped arc tube. It is a figure which shows the light-bulb-type fluorescent lamp 1 using the conventional double spiral arc tube 2a, (a) is the lamp | ramp structure figure which saw through the inside, (b) is a lamp external view. It is a longitudinal cross-sectional front view of the conventional fluorescent lamp 10 of the external electrode system.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Light bulb type fluorescent lamp, 2 luminous tube, 2a Double spiral luminous tube, 3 High frequency lighting circuit, 4 Cover, 5 base, 6 Outer tube glove, 7 Electrode, 8 Main amalgam, 9 Auxiliary amalgam, 11 Glass tube, 12 Discharge gas, 13 phosphor, 14a external electrode, 14b external electrode, 14c external electrode, 14d external electrode, 17 high frequency power supply, 20 insulating member, 21 secondary electron emitting substance.

Claims (2)

An arc tube in which mercury and a rare gas are sealed inside, both ends are closed, and a phosphor film is formed on the inner surface;
A pair of external electrodes provided on the outer surfaces of both ends of the arc tube;
An insulating member provided outside the arc tube and electrically insulating the pair of external electrodes;
A high-frequency lighting circuit for lighting the arc tube;
A cover containing the high-frequency lighting circuit and having a base;
A bulb-type fluorescent lamp comprising an outer tube globe covering the arc tube. An arc tube in which mercury and a rare gas are sealed inside, both ends are closed, and a phosphor film is formed on the inner surface;
A pair of external electrodes provided on the outer surface of the arc tube excluding the areas where the arc tubes are close to each other;
A high-frequency lighting circuit for lighting the arc tube;
A cover containing the high-frequency lighting circuit and having a base;
A bulb-type fluorescent lamp comprising an outer tube globe covering the arc tube.

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