JPS6237864A - Fluorescent lamp - Google Patents

Abstract

PURPOSE:To enhance the efficiency of light emission, by providing each light- permeable container with an annular discharge groove surrounded by the inner and outer circumferential walls of the container and the radial wall thereof to increase a total discharge length and reduce the absorption of ultraviolet rays performed by mercury atoms. CONSTITUTION:Each of light-permeable containers 1, 2 comprises an outer and an inner vertical circumferential walls 11, 12 and an annular bottom 10. An annular discharge groove 13 is defined by the walls 11, 12 and the bottom 10 so that discharge is caused in a space comprising the annular discharge grooves 13 and discharge holes 15, 16 of the containers 1, 2. Since the discharge space is curved, the total length of the discharge is made large. Since the discharge is caused near the outer circumferential walls 12 of the containers 1, 2, the ratio of absorption of ultrasonic rays performed by mercury atoms is reduced. The ratio of simulation of coating films 17 of a fluorescent substance on the inside surfaces of the outer circumferential walls 12 is thus augmented to enhance the efficiency of light emission.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a compact fluorescent lamp.

[Conventional technology]

In general, fluorescent lamps have the characteristics of high efficiency and long life, and for this reason, the use of fluorescent lamps in place of incandescent light bulbs has recently been reconsidered from the viewpoint of energy conservation.

Fluorescent lamps are used as an alternative light source to incandescent bulbs.

In such cases, it is desirable that the fluorescent lamp be constructed so that it can be attached to existing incandescent lamp fixtures. That is, the shape of the fluorescent lamp is required to resemble that of an incandescent light bulb.

Conventionally, a straight glass bulb was bent into an annular, U-shaped, double U-shaped (saddle-shaped) shape, etc. to obtain a compact shape the size of an incandescent light bulb, that is, a fluorescent lamp with concentrated light distribution. Efforts were being made.

However, in recent years, there has been a demand for further miniaturization and higher output of this type of lamp.

In a fluorescent lamp, if the bulb diameter is the same, increasing the discharge distance increases the effective light emitting length and also increases the input power, resulting in a higher light output.

Therefore, in order to increase the light output, a fluorescent lamp with a long discharge distance is advantageous. However, making the lamp more compact and increasing the discharge distance are contradictory techniques.

In particular, in the past, straight glass bulbs were bent into annular, U-shaped, double U-shaped (saddle-shaped) shapes, etc. in order to fit into a compact size, but in order to further lengthen the discharge distance, It is extremely difficult to form such a meandering curved discharge path using a single straight glass bulb.

For this reason, a technique disclosed in Japanese Patent Application Laid-open No. 115747/1983 has been developed for the purpose of making the lamp more compact and increasing the length of the discharge path.

This product has a cylindrical shape with a bottom, and the inside is partitioned by partition walls, and multiple translucent containers with discharge holes in the bottom wall are stacked, and the opening of the translucent container at the end is closed with a closing plate. By doing so, one discharge path connecting the inside of the light-transmitting container and the discharge hole is formed.

This configuration has the advantage that the length of the discharge path can be made relatively large even though the overall size of the lamp is small, and moreover, it can be manufactured using a single straight glass bulb. This is easier than creating it by curving it.

[Problem that the invention seeks to solve]

However, the fluorescent lamp disclosed in the above publication is
A partition wall that partitions the inside of the translucent container is formed to pass through the center (diameter) of the translucent container.

According to this structure, the discharge between both electrodes has the property of passing through the shortest distance, so inside the translucent container, the discharge flows along the straight line connecting the discharge holes, that is, along the partition wall passing through the center of the translucent container. Electric discharge occurs.

Such discharge shortens the total discharge distance and occurs at a position far from the outer peripheral wall of the translucent container, so
The absorption of ultraviolet rays by mercury atoms increases, and therefore the rate of excitation of the phosphor coating provided on the inner surface of the outer peripheral wall of the translucent container decreases, resulting in a problem that the luminous efficiency is not good.

The present invention generates a discharge inside the light-transmitting container close to the inner surface of the outer peripheral wall of the light-transmitting container, thereby increasing the total discharge distance and reducing the absorption of ultraviolet rays by mercury atoms. The present invention aims to provide a fluorescent lamp with improved luminous efficiency by increasing the excitation rate of a phosphor coating provided on the inner surface of the outer peripheral wall of a luminous container.

[Means for solving problems]

The present invention is characterized in that a donut-shaped discharge groove surrounded by an outer circumferential wall, an inner circumferential wall, and one side wall is formed in the light-transmitting container.

[Effect]

According to such a configuration, inside the light-transmitting container, the discharge holes are connected to each other, and discharge occurs along the donut-shaped discharge groove. This kind of discharge has an arc shape, so the total discharge distance is long, and since it passes close to the outer peripheral wall of the translucent container, the absorption rate of ultraviolet rays by mercury atoms is small. The excitation ability of the phosphor coating is increased,
Luminous efficiency improves.

[Embodiments of the invention]

The present invention will be described below based on examples.

1 and 2 show a first embodiment of the present invention, in which 112' is a translucent container, 3 is a closing plate, 4 is a top cover, and 5, 5 is an electrode mount.

The translucent containers 1 and 2 are each made of a translucent material such as soft glass, and have a donut-shaped shallow dish shape. That is, each of the translucent containers 1 and 2 has an outer circumferential wall 11 and an inner circumferential wall 12 standing vertically on a donut-shaped bottom wall 10 (one side wall). 12, a donut-shaped discharge groove 13 is formed. A partition wall 14 is provided over the outer circumferential wall 11 and the inner circumferential wall 12 to partition the donut-shaped discharge groove 13 in the circumferential direction. The bottom wall 10 includes a partition wall 4
A discharge hole 15 or 1B is formed near the hole 4.

One translucent container 1 has the discharge hole 15 formed in the vicinity of the counterclockwise side of the partition wall 14, and the other translucent container 2 has the discharge hole 16 formed in the vicinity of the partition wall 14. It is formed near the clockwise side with respect to l4.

A phosphor coating 17 is provided on the inner surfaces of such translucent containers 1 and 2, in particular on at least the inner surface of the outer peripheral wall 11.

Note that the central hole 18 may or may not be provided with a phosphor coating.

The closing plate 3 closes the open surface of the translucent container 1 or 2 located at the end, is made of a translucent material such as soft glass, and is formed in the shape of a donut-shaped disk. This closing plate 3 has a central hole 19 and a discharge hole 20 formed therein.

The top cover 4 has a substantially hemispherical shape that covers the closure plate 3, and is made of a transparent material such as soft glass. The inner surface of the top cover 4 is also provided with a phosphor coating 21.

As is already known, the electrode mounts 4, 4 are connected to the stem glass 22 via lead wires 23.23 to the electrodes 24.2.
4 is attached, and 25 indicates an exhaust pipe.

A fluorescent lamp is constructed by joining the above-mentioned parts together as follows.

That is, a plurality of translucent containers 1 and 2 are stacked concentrically -L such that the bottom wall of one container closes the opening of the other container. In this case, the translucent containers 1 and 2 are stacked alternately, and each container l.

The two partition walls 14 are arranged so as to be lined up on the same line.

Then, these overlapping portions are hermetically joined using a glass solder 27.

The opening of the translucent container located at one end, in the case of the example, the translucent container l located at the upper end, is hermetically joined by a closing plate 8 via a glass solder z7. In this case, the discharge hole 20 formed in the closing plate 3 is arranged so as to be located on the opposite side to the partition wall 14 from the discharge hole 15 of the translucent container 1 located at the upper end.

Furthermore, the top cover 4 is attached to the closure plate 3 via the glass solder 27.

An electrode mount 4.4 is attached to the translucent container 1 located at one end, in the case of the embodiment, the lower end. That is, one electrode mount 4 is sealed to the discharge hole 15 of the translucent container l located at the lower end, and the other electrode mount 4 is sealed to the central hole 18 of the translucent container 1 located at the lower end. is sealed.

In the fluorescent lamp having such a configuration, the air in the internal space is exhausted through the exhaust pipe 25, and then mercury and a starting rare gas are filled in, and the exhaust pipe 25 is sealed off.

However, in such a fluorescent lamp, the electrodes 24°24
When a voltage is applied between them, a discharge occurs between these electrodes 24,24.

As shown by the arrow, this discharge path is from the electrode 24 sealed to the discharge hole 15 of the translucent container l located at the lower end to the donut-shaped discharge groove 13 of the translucent container l located at the lower end.
, discharge hole 1B of the translucent container 2 located in the middle, donut-shaped discharge groove 13 of the translucent container 2 located in the middle, discharge hole 15 of the translucent container l located at the upper end, located at the upper end The donut-shaped discharge groove 13 of the transparent container l, the discharge hole 20 formed in the closing plate 3, the internal space of the top cover 4, the central hole 19 formed in the closing plate 8, the upper end and the middle transparent container 1 , 2, each of the central holes 18 .

Since such discharge passes through the donut-shaped discharge grooves 13 in each of the translucent containers 1 and 2, the discharge path becomes longer than in the conventional case.

Moreover, since such discharge occurs along the outer circumferential wall 11 of the translucent containers 1 and 2, absorption of ultraviolet rays by mercury atoms is reduced, and the phosphor coating 17 provided on the inner surface of the outer circumferential wall 11 is Since the excitation rate is increased and the donut-shaped discharge groove 13 has a smaller discharge cross-sectional area than the conventional one, the discharge current can be reduced.

FIG. 3 shows a second embodiment of the invention.

This second embodiment is similar to the top cover 4 of the first embodiment.
Instead, a spherical outer cover 30 is used, and the other structure is the same as that of the first embodiment, so a description thereof will be omitted.

The spherical outer cover 30 is made of a transparent material such as soft glass, and has a phosphor coating 31 on its inner surface. The lower end opening of this spherical envelope cover 30 is hermetically joined to the outer surface of the lower end translucent container 1 by a glass solder 32.

The fluorescent lamp having such a structure has the same function as that of the first embodiment, and has a shape more similar to that of an incandescent light bulb than that of the first embodiment.

Since the lower end opening of the spherical outer cover 30 is hermetically joined to the lower end translucent container l, each translucent container l
, 2 to each other or the closing plate 3, there is no need for highly accurate airtight joining, and the joining work becomes easy.

4 and 5 show a third embodiment of the invention.

In this third embodiment, the light-transmitting containers 1 and 2 are provided with two partition walls 40.4I that partition the donut-shaped discharge grooves 13 in the circumferential direction. It is. A discharge conduction hole 48 is provided in the bottom wall of the smaller space defined by the partition walls 40 and 41.

One translucent container 1 has the discharge hole 5 formed near the counterclockwise side of one partition wall 40, and the other translucent container 2 has the discharge hole 16 formed in the vicinity of the other partition wall 40. It is formed near the wall 41 on the clockwise side.

The closing plate 3 has discharge holes 44 and 45 formed eccentrically from the center.

The top cover 4 has an inverted shallow dish shape that covers the closure plate 3,
A central hole 46 and a partition wall 47 are provided.

The transparent containers 1 and 2, the closing plate 3, and the top cover 4 are stacked and bonded, and electrode mounts 5.5 are attached to the discharge hole I5 and the discharge conduction hole 43 of the transparent container I located at the lower end. When sealed, the fluorescent lamp is completed.

In the fluorescent lamp of the third embodiment, the discharge conduction holes 43 of each translucent container 1 and 2 are connected to the partition walls 40 and 4.
1 from the donut-shaped discharge grooves 18, they communicate in the axial direction, and have the same effect as the central hole of the first embodiment.

Therefore, a discharge path connecting the two electrodes 24, 24 is formed by connecting the donut-shaped discharge grooves 13.

-12= The fourth embodiment shown in FIG. 6 may have the structure of either the first embodiment or the third embodiment, but
Translucent containers 1 and 2, closure plate 3 and top cover 4
The shapes of the translucent containers 1 and 2 and the top cover 4 have been changed so that when they are stacked and joined together, the outer shape becomes approximately spherical.

Note that the present invention is not limited to the structure of each embodiment described above.

That is, for example, a phosphor coating is formed on the inner surface of at least the portion that will become the outer peripheral wall of the completed lamp, while a light reflecting surface or a diffusing surface is formed on the inner surface of other portions. Alternatively, a light reflecting surface or a diffusing surface may be formed as the first layer film, and a phosphor coating may be formed as the second layer film.

Further, each of the translucent containers 1 and 2 may be used with the illustrated vertical direction reversed.

〔Effect of the invention〕

As explained above, according to the present invention, the donut-shaped discharge groove surrounded by the outer circumferential wall, inner circumferential wall, and one side wall is formed in the translucent container. It occurs near the inner surface of the outer peripheral wall of the container, and as the total discharge distance becomes longer, the absorption rate of ultraviolet rays by mercury atoms decreases, and therefore the excitation ratio of the phosphor coating provided on the inner surface of the outer peripheral wall of the translucent container decreases. This results in an increase in luminous efficiency.

[Brief explanation of drawings]

The drawings show embodiments of the present invention; FIG. 1 is an exploded perspective view showing the first embodiment of the invention, FIG. 2 is a sectional view of the joined state, and FIG. 4 is an exploded perspective view showing the third embodiment of the present invention, FIG. 5 is a sectional view of the joined state, and FIG. 6 is a sectional view of the fourth embodiment of the present invention. FIG. 1.2... Translucent container, 3... Closure plate, 4... Top cover, 5.5... Electrode mount, 10... Bottom wall (one side wall), 11... Inside Peripheral wall, 12...Outer peripheral wall, 1
3... Donut-shaped discharge groove, 14.40.41... Partition wall, 15.18... Discharge hole, 17, 21... Phosphor coating, 18... Center hole, 43. ...Discharge communication hole. Applicant's representative Patent attorney Takehiko Suzue Figure 1 Figure 2 Figure 3 To Figure 4 z4 Figure 5

Claims (1)

[Claims] It has a donut-shaped discharge groove surrounded by an outer peripheral wall, an inner peripheral wall, and one side wall and is open on the other side, and has a partition wall that partitions the donut-shaped discharge groove in the circumferential direction, and the above-mentioned one near the partition wall. A light-transmitting container having a discharge hole formed in a side wall and a closing plate for closing the opening of the light-transmitting container, a plurality of the light-transmitting containers being stacked and joined together, and located at the end. By closing the open part of the translucent container with the closing plate, a single discharge path connecting the discharge groove and the discharge hole is formed, electrodes are arranged at both ends of this discharge path, and the discharge path A fluorescent lamp characterized in that a fluorescent film is formed on the inner surface of the lamp.