JP2001283607A - Electric bulb type fluorescent lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric bulb type fluorescent lamp starting up luminous flux of a fluorescent lamp quickly and maintaining a luminous output in a designated range during a designated period. SOLUTION: An enclosed mercury 11 is enclosed in a fluorescent lamp 2 in a form of pure mercury or amalgam having a mercury vapor pressure characteristic equivalent to that of pure mercury. A cooling medium 5 including a material having a melting point in a range of 35-50 deg.C as a main body is housed in a base body 2 together with the enclosed mercury 11 and is made to contact with a part of a bulb 7a of the fluorescent lamp 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compact fluorescent lamp.

[0002]

2. Description of the Related Art Electric characteristics of a fluorescent lamp are determined by the vapor pressure of mercury in a bulb. The mercury vapor pressure is generally determined by the temperature of the coldest part of the valve. Generally, in a fluorescent lamp, when the coldest part temperature of the bulb is about 40 ° C., the mercury vapor pressure in the bulb becomes 0.8 Pa (Pascal), and the light output becomes maximum. Therefore, the fluorescent lamp is designed such that the temperature of the coldest part of the bulb is about 40 ° C. at an ambient temperature of 25 ° C.

However, the bulb-type fluorescent lamp has a high tube wall load because the bulb is a thin tube, and when pure mercury is sealed as a discharge medium, the mercury vapor pressure increases and the light output decreases. Therefore, the bulb-type fluorescent lamp is filled with amalgam and suppresses an increase in the mercury vapor pressure to maintain a predetermined light output. However, in this case, there is a problem that the mercury vapor pressure immediately after lighting is low and the rise of the luminous flux of the fluorescent lamp is slow.

As a method for maintaining the vapor pressure of mercury in a bulb at a predetermined vapor pressure, there is a single-capped fluorescent lamp disclosed in Japanese Patent Application Laid-Open No. 64-72450 (prior art 1). As shown in FIG. 3, the single-base fluorescent lamp 30 has a thin tube 32 extending from an end 31a of a bent bulb 31, enclosing the thin tube 32, and attaching a base 33 to the bulb end. The thin tube 32 is fixed to the bottom of the base 33 with an adhesive 34 mixed with powder or small pieces of metal or metal oxide. And
Since the metal powder mixed with the adhesive 34 has a high thermal conductivity, the mercury vapor pressure in the bent valve 31 is maintained at a predetermined vapor pressure in order to efficiently transmit the heat of the thin tube 32 to the base 33 and radiate the heat. can do.

Another method is disclosed in Japanese Patent Application Laid-Open No. 58-1 / 1983.
There are bulb-type fluorescent lamps disclosed in JP-A-78951, JP-A-58-181262 and JP-A-58-197650 (prior art 2). This bulb-shaped fluorescent lamp 35 is, for example, as shown in FIG.
A part or all between the globe 6 and the glove 37 is connected by a heat conductive medium 38. The heat conductive medium 38 is a solid having good heat conductivity, for example, a simple substance or a mixture of metal, silicone resin, glass and the like. Since the outer surface of the bent valve 36 is connected to the globe 37 via the heat conductive medium 38, the heat of the bent valve 36 is radiated from the globe 37, and the mercury vapor pressure in the bent valve 36 increases. Is pressed.

[0006]

In the single-ended fluorescent lamp 30 of the prior art 1, the temperature of the coldest part can be formed in the thin tube 32. However, in the bulb-type fluorescent lamp, since the end of the bent bulb is disposed in the base (cover), the thin tube 3 is not used.
In order to extend 2 on the inner surface of the base, it is necessary to bend the thin tube 32, which is difficult. In addition, the bulb-type fluorescent lamp 35 of the prior art 2 has a problem that the radiated light from the bulb 36 is blocked by the heat conductive medium 38 to reduce the light output. There is a problem that the lamp 35 is expensive or a bulb-type fluorescent lamp in which the bent bulb 36 is exposed cannot be formed.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a compact fluorescent lamp in which the luminous flux of the fluorescent lamp rises quickly and the light output can be maintained within a predetermined range for a predetermined period.

[0008]

According to a first aspect of the present invention, there is provided a bulb-type fluorescent lamp in which a discharge medium comprising mercury and a rare gas is sealed, a phosphor layer is formed on the inner surface, and a pair of opposite ends is provided. A fluorescent lamp having a bent bulb in which the electrodes are sealed; a base having a base at one end and a fluorescent lamp attached to the other end; and a base housed in the base and electrically connected to the base and the fluorescent lamp. A lighting circuit connected to turn on the fluorescent lamp; a cooling medium mainly composed of a substance having a melting point in the range of 35 to 50 ° C. contained in the base so as to be in contact with a part of the bulb of the fluorescent lamp. And;

The bent valve heats a straight tubular valve,
In addition to those that are softened and bent, valves that are formed in a so-called bridge shape or a mold shape in which tubular valves are connected to each other at their ends to communicate with each other are also included.

The cooling medium is preferably non-toxic and has a high heat of fusion, such as phenyl salicylate. If the heat of fusion is large, it takes time to melt, so that the coldest part can be formed in a part of the bulb of the fluorescent lamp for a long time.

A part of the bulb of the fluorescent lamp has a melting point of 35.
Since it comes into contact with the cooling medium mainly composed of a substance in the range of ５０50 ° C., the coldest part is provided at a part of the valve in contact with the cooling medium at least for a period until the substance is completely melted. It is formed. Generally, in a fluorescent lamp, when the coldest part temperature of the bulb is about 40 ° C., the mercury vapor pressure in the bulb becomes 0.8 Pa (Pascal), and the light output becomes maximum. Therefore, the fact that the melting point of the substance is in the range of 35 to 50 ° C. means that when the coldest part temperature is formed in this temperature range, the fluorescent lamp can obtain light output in a predetermined range.

According to the present invention, the coldest part temperature corresponding to the melting point of the substance constituting the cooling medium is formed in a part of the valve at least until the cooling medium is completely melted.
Then, the mercury vapor pressure in the bulb is maintained in a predetermined range by the temperature of the coolest part, and the fluorescent lamp emits light in a predetermined range.

According to a second aspect of the present invention, there is provided a bulb-type fluorescent lamp according to the first aspect, wherein the bulb of the fluorescent lamp is provided with a thin tube extending outwardly in communication with the inside of the bulb. And the thin tube is configured to be in contact with the cooling medium.

According to the present invention, since the thin tube communicating with the inside of the valve and extending outward is configured to contact the cooling medium, the coolest portion is formed in the thin tube, and the mercury in the valve is formed. The vapor pressure is maintained in a predetermined range, and light output in a predetermined range is performed from the fluorescent lamp. In addition, since the thin tube comes into contact with the cooling medium, the contact area with the cooling medium is small, the amount of heat transferred from the thin tube to the cooling medium is small, and the period until the cooling medium is completely melted becomes longer, and the fluorescent A predetermined range of light output from the lamp is produced over a long period of time.

According to a third aspect of the present invention, there is provided the bulb-type fluorescent lamp according to the first or second aspect, wherein the cooling medium is contained in a container provided in the base. Is formed with an insertion hole into which a part of the valve is inserted, and the insertion hole is closed so that the cooling medium does not leak out of the container.

According to the present invention, since the insertion hole of the container into which the part of the valve is inserted is closed, the leakage of the cooling medium into the base is prevented, and the part of the valve is cooled to the lowest temperature. A part is formed.

According to a fourth aspect of the present invention, there is provided the bulb-type fluorescent lamp according to any one of the first to third aspects, wherein the mercury in the discharge medium is pure mercury or a mercury vapor pressure equivalent to pure mercury. It is characterized by being enclosed in the form of amalgam having characteristics.

The form of amalgam includes pure mercury, bismuth (Bi), tin (Sn), indium (In), and lead (P
b) and the like.

According to the present invention, mercury in the discharge medium is sealed in the form of pure mercury or amalgam having a mercury vapor pressure characteristic equivalent to that of pure mercury. Then, the rising of the luminous flux of the fluorescent lamp is made earlier. Therefore, a bulb-type fluorescent lamp with a high light output is provided.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a partially cutaway front view of a bulb-type fluorescent lamp showing a first embodiment of the present invention. In the figure, 1
Is a bulb-shaped fluorescent lamp, 2 is a fluorescent lamp, 3 is a base, 4 is a lighting circuit, and 5 is a cooling medium. Light bulb shaped fluorescent lamp 1
Is composed of a fluorescent lamp 2, a base 3 having a base 6 at one end, a lighting circuit 4 housed in the base 3, a cooling medium 5, and the like.

The fluorescent lamp 2 has a single discharge path 8 formed by connecting three bulbs 7a, 7b and 7c bent in a U-shape by a joint (not shown). The connected bulbs 7a, 7b, 7c have a phosphor layer 9 that emits visible light formed on the inner surface. Further, at both ends of the connected valves 7a, 7b, 7c,
And a pair of filament electrodes 1 at one end of the bulb 7c.
A discharge medium 13 such as mercury 11 and argon gas 12 as a rare gas is sealed therein. Here, the mercury 11 is enclosed in the form of pure mercury or amalgam having a mercury vapor pressure characteristic equivalent to that of pure mercury. The mercury 11 evaporates immediately due to the heat generated by the valves 7a, 7b, 7c. The end of the fluorescent lamp 2 is supported by a partition plate 14.

The base 3 is made of a heat-resistant polybutylene terephthalate (PBT) resin, has a base 6 at one end and a partition plate 14 at the other end on which the fluorescent lamp 2 is supported. It is fixed by an adhesive. That is, the fluorescent lamp 2 is attached to the other end of the base 3.

The base 3 houses a lighting circuit 4. The lighting circuit 4 is a circuit board 1 made of PBT resin.
5, a well-known circuit in which electronic components such as a transistor 16, an electrolytic capacitor 17, and a film capacitor 18 are mounted. And the circuit board 15
Is attached by an adhesive or a screw or the like to an attachment plate 19 fixed to the inner wall of the base 3 with an adhesive or the like. The lighting circuit 4 is electrically connected to the base 6 and the filament electrodes 10 of the fluorescent lamp 2,
When the power is supplied through the base 6, the high frequency power is output to turn on the fluorescent lamp 2.

The base 3 contains a cooling medium 5. The cooling medium 5 is accommodated in, for example, a rectangular container 20 made of glass and provided in the base 3. This container 20 is located on the end side of the valves 7a, 7b, 7c,
It is supported by a mounting plate 19, and its support is fixed by an adhesive. The container 20 has an insertion hole 2
1 is formed. The cooling medium 5 is injected from the insertion hole 21 into the container 20.

The other end of the valve 7a has a valve 7a
Is provided with a thin tube 22 extending outwardly in communication with the inside. Then, the thin tube 22 is inserted into the container 20 from the insertion hole 21 and is in contact with the cooling medium 5. A thermosetting resin 23 is interposed in the gap between the insertion hole 21 and the thin tube 22 so that the cooling medium 5 in the container 20 does not leak out of the container 20. That is, the insertion hole 21 is closed by the thin tube 22 and the thermosetting resin 23.
The amount of the cooling medium 5 injected into the container 20 may be, for example, even if the cooling medium 5 changes from a liquid state to a solid state and expands.
It is set to be within 0. Then, at least a period until the cooling medium 5 in the container 20 is completely melted,
In the thin tube 22, the coldest part temperature of the connected valves 7a, 7b, 7c is formed.

The cooling medium 5 has a melting point of 35 to 50.
It is mainly composed of a substance within the range of ° C, and is, for example, phenyl salicylate having a melting point of 42 ° C. If the coldest part temperature in the thin tube 22 can be maintained at a temperature in the range of 35 to 50 ° C., the connected valves 7 a,
The mercury vapor pressure in 7b, 7c is maintained at a predetermined pressure,
Light is output from the fluorescent lamp 2 in a predetermined range. Also,
Substances having a melting point in the range of 35 to 50 ° C. include, in addition to phenyl salicylate, methyl stearate (melting point: 38
C), P-aminodimethylaniline (melting point 41 ° C), elaidin (melting point 45 ° C), and the like.

Next, the operation of the first embodiment will be described.

When the lighting circuit 4 is supplied with power through the base 6, the lighting circuit 4 outputs a high-frequency voltage to
Is applied between the filament electrodes 10, 10. Then
A discharge is formed in the discharge path 8 between the filament electrodes 10, 10, and the mercury 11 forming the discharge medium 13 evaporates. Then, visible light is radiated from the phosphor film 9 by the bright line of the mercury 11, and is radiated outside from the bulbs 7a, 7b, 7c.

Since the mercury 11 is sealed in the form of pure mercury or amalgam having a mercury vapor pressure characteristic equivalent to that of pure mercury, the bulb 7a,
It evaporates immediately due to the low heat generated by 7b and 7c. As a result, the mercury vapor pressure in the connected bulbs 7a, 7b, 7c rises quickly, and the luminous flux of the fluorescent lamp 2 rises fast. That is, the light bulb-shaped fluorescent lamp 1 can obtain a predetermined brightness in a short time after lighting.

Since the thin tube 22 is formed so as to be in contact with the phenyl salicylate 5 as a cooling medium in the container 20, a coldest portion is formed at the contact portion of the thin tube 22 with the phenyl salicylate 5. The mercury vapor pressure in the connected valves 7a, 7b, 7c is controlled by the temperature of the coolest part.

When the temperature of the connected bulbs 7a, 7b and 7c rises due to the discharge between the filament electrodes 10 and 10 and heat is generated, heat is transmitted from the other end of the bulb 7a to the capillary 22 and the temperature of the capillary 22 rises. I do. And the thin tube 2
When the temperature of 2 becomes the melting point of phenyl salicylate 5 (42 ° C.), the phenyl salicylate 5 in the container 20 starts to melt. Then, even when the phenyl salicylate 5 is melted, the temperature of the thin tube 22 in the container 20 is maintained at the melting point of the phenyl salicylate 5. The temperature of the capillary 22 is maintained at the melting point of the phenyl salicylate 5 for at least a period until the phenyl salicylate 5 in the container 20 is completely melted. During this period, the connected valve 7
The mercury vapor pressures in a, 7b, and 7c are appropriately maintained with the melting point of phenyl salicylate 5 being the coldest part temperature, and a predetermined light output from the fluorescent lamp 2 is achieved. Since the capacity of the phenyl salicylate 5 in the container 20 is relatively large, the temperature of the thin tube 22 is maintained at the melting point of the phenyl salicylate 5 for a long time, and a predetermined light output is produced from the fluorescent lamp 2.

After the phenyl salicylate 5 in the container 20 is completely melted, the connected valves 7a, 7b,
The coldest part is formed at an arbitrary position of 7c.

As described above, the connected valves 7a, 7
Since the narrow tube 22 communicating with b and 7c is configured to come into contact with the phenyl salicylate 5 in the container 20, it is cooled to the melting point of the phenyl salicylate 5 at least until the phenyl salicylate 5 is completely melted. The part temperature is maintained. As a result, the connected valves 7a, 7
The mercury vapor pressure in b and 7c is maintained in a predetermined range, and light output in a predetermined range can be obtained from the fluorescent lamp.

Further, since the contact area between the thin tube 22 and the phenyl salicylate 5 is small, the amount of heat transferred from the thin tube 22 to the phenyl salicylate 5 is small, and the amount of heat transferred until the phenyl salicylate 5 in the container 20 is completely melted is reduced. The period is longer. As a result, a predetermined range of light output from the fluorescent lamp 2 can be obtained for a long period of time.

The phenyl salicylate 5 is accommodated in a rectangular container 20 provided in the base 2,
Since the thin tube 22 is inserted into the insertion hole 21 and the insertion hole 21 is closed by the thermosetting resin 23, the thin tube 22 is inserted regardless of the lighting direction of the fluorescent lamp 2, that is, the mounting direction of the bulb-type fluorescent lamp 1. A coldest part temperature corresponding to the melting point of phenyl salicylate 5 is formed, and leakage of phenyl salicylate 5 into base 3 can be prevented.

The mercury 11 forming the discharge medium 13
Is sealed in the form of pure mercury or an amalgam having a mercury vapor pressure characteristic equivalent to pure mercury, so that the luminous flux of the fluorescent lamp 2 rises quickly, and the bulb-type fluorescent lamp 1
After lighting, a predetermined brightness can be obtained in a short time. As a result, the bulb-type fluorescent lamp 1 can be installed in a room where it is desired to immediately obtain a predetermined brightness, such as a bathroom or a toilet.

The thin tube 22 is connected to the connected valves 7a,
It may be provided from either side of both ends of 7b and 7c, and the number is not limited to one but may be plural.

Next, a second embodiment of the present invention will be described.

FIG. 2 is a partially cutaway front view of a bulb-type fluorescent lamp showing a second embodiment of the present invention. The same parts as those in FIG. 1 and the parts corresponding to the same parts are denoted by the same reference numerals, and description thereof will be omitted.

The bulb-type fluorescent lamp 24 shown in FIG. 2 is formed by extending the other end 7A of the bulb 7a outward, and inserting the other end 7A into the container 20 through the insertion hole 21 as a cooling medium. In contact with phenyl salicylate 5. After the insertion of the other end 7A, the insertion hole 21 is closed by the thermosetting resin 23 so that the phenyl salicylate 5 in the container 20 does not leak out of the container 20.

In the bulb-type fluorescent lamp 24, the coldest part of the fluorescent lamp 2 is formed at the other end 7A at least during a period until the phenyl salicylate 5 in the container 20 is completely melted. The temperature of the coldest part is a temperature corresponding to the melting point of phenyl salicylate 5.

As described above, the bulb 7 of the fluorescent lamp 2
What is necessary is that the phenyl salicylate 5 (cooling medium) is in contact with a part of the valves a, 7b, and 7c, and a coldest portion can be formed in the contacting valves 7a, 7b, and 7c. . Therefore, for example, a thin tube may be extended from the side surfaces of the valves 7a, 7b, 7c, and the thin tube may be brought into contact with the cooling medium.

In the first and second embodiments, the bulb-type fluorescent lamps 1 and 24 in which the fluorescent lamp 2 is exposed have been described. However, the bulb-type fluorescent lamp of the present invention includes the fluorescent lamp 2 therein. A glove having a glove attached to the other end of the base 3 may be provided.

[0045]

According to the first aspect of the present invention, since a part of the bulb of the fluorescent lamp is configured to be in contact with the cooling medium, at least a period until the cooling medium is completely melted is provided. The coldest part corresponding to the melting point of the cooling medium can be formed in a part of the bulb, and the mercury vapor pressure in the bulb can be maintained in a predetermined range, and a light output in a predetermined range can be obtained from the fluorescent lamp. .

According to the second aspect of the present invention, since the contact area between the thin tube and the cooling medium is small and the amount of heat transfer from the thin tube to the cooling medium is small, the period until the cooling medium is completely melted is long. Thus, a predetermined range of light output can be obtained from the fluorescent lamp for a long period of time.

According to the third aspect of the present invention, the cooling medium is housed in the container provided in the base, and the insertion hole of the container is partially closed by inserting a part of the bulb. Regardless of the mounting direction, the coldest portion corresponding to the melting point of the cooling medium can be formed in a part of the valve, and the leakage of the cooling medium into the base can be prevented.

According to the fourth aspect of the present invention, since the mercury of the discharge medium is sealed in the form of pure mercury or amalgam having a mercury vapor pressure characteristic equivalent to that of pure mercury, the luminous flux of the fluorescent lamp rises quickly. The light bulb shaped fluorescent lamp can obtain a predetermined brightness in a short time after lighting. Therefore, the bulb-type fluorescent lamp can be mounted in a room such as a bathroom or a toilet where it is desired to have a predetermined brightness immediately.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view of a light bulb-shaped fluorescent lamp showing a first embodiment of the present invention.

FIG. 2 is a schematic partially cutaway front view of a light bulb-shaped fluorescent lamp showing a second embodiment of the present invention.

FIG. 3 is a partially cutaway front view of a one-necked fluorescent lamp according to prior art 1;

FIG. 4 is a front view of a bulb-type fluorescent lamp according to Prior Art 2.

[Explanation of symbols]

 1,24: bulb-type fluorescent lamp 2: fluorescent lamp 3: base 4: lighting circuit 5: phenyl salicylate as cooling medium

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Yuichi Sakakibara 4-3-1 Higashishinagawa, Shinagawa-ku, Tokyo Toshiba Litec Co., Ltd. F-term (reference) 5C039 AA03

Claims (4)

[Claims] 1. A fluorescent lamp having a bent bulb in which a discharge medium comprising mercury and a rare gas is sealed, a phosphor layer is formed on an inner surface, and a pair of electrodes are sealed at both ends; A base having a base and having a fluorescent lamp attached to the other end; a lighting circuit housed in the base and electrically connected to the base and the fluorescent lamp to turn on the fluorescent lamp; So that it contacts the part
And a cooling medium mainly composed of a substance having a melting point in the range of 35 to 50 ° C. housed in the substrate. 2. A bulb of a fluorescent lamp is provided with a thin tube communicating with the inside of the bulb and extending outward, and the thin tube is configured to be in contact with a cooling medium. The fluorescent lamp according to claim 1. 3. The cooling medium is housed in a container provided in the base, and the container has an insertion hole into which a part of a valve is inserted, and the insertion hole is provided outside the container. 3. The bulb-type fluorescent lamp according to claim 1, wherein the bulb-type fluorescent lamp is closed so as not to leak into the lamp. 4. The bulb shape according to claim 1, wherein the mercury of the discharge medium is sealed in the form of pure mercury or amalgam having a mercury vapor pressure characteristic equivalent to that of pure mercury. Fluorescent lamp.