JP2000173303A - Bulb type fluorescent lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fluorescent lamp which can restrain an increase of inner air pressure in an envelope without damaging its appearance even it is a substantially sealed type envelope and prevent a breakage of the envelope. SOLUTION: This lamp is structured to comprise: a luminous tube 18; a cover 14 which supports the luminous tube 18 and has a base 12; a lighting device 16 which lights the luminous tube 18 enclosed in the cover 14; a glove 17 which covers the luminous tube 18 and is attached to the cover 14 in a substantially sealed condition; and a ventilation means 19 which is formed between the cover 14 and a base 12. A ventilation can be performed by the ventilation means 19 which is formed between the cover 14 and the base 12 even the inside of the cover 14 is a substantially sealed condition. Thereby, it is possible to prevent breakage of the cover 14 and prevent its appearance from being spoiled even if an inner air pressure of the cover 14 is excessively increased according to a temperature increase or the like of the lighting device 16.

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 Conventionally, for example, a light bulb type having a base mountable to a socket of an incandescent light bulb, and having an inner cover comprising a cover for accommodating a lighting circuit and a glove accommodating a bent arc tube. Fluorescent lamps are known.

A compact fluorescent lamp is disclosed in, for example, Japanese Patent No. 256
As described in Japanese Patent Publication No. 3028, a substantially sealed envelope having no heat radiating hole is employed to reduce the size for compatibility with an incandescent lamp and to improve the appearance.

FIG. 8 is a schematic sectional view showing a conventional compact fluorescent lamp having a substantially sealed envelope. The envelope is composed of a cover 101 and a globe 102 on which no heat radiation holes are formed. Reference numeral 103 denotes a base mountable on a socket of the incandescent lamp, and a cylindrical strip 104 having a spiral ridge integrally formed on the top of the cover 101 formed on the surface.
To be screwed. A lighting circuit 106 is accommodated in the cover 101 via a holder 105,
The bent fluorescent lamp 107 covered by the globe 102 is supported by the holder 105.

[0005] This conventional bulb-type fluorescent lamp has a cover 1
01 and the glove 102 are filled with a silicone adhesive 108 over the entire periphery of each opening and fixed.
The base 103 is screwed onto the cylindrical portion 104 of the cover 101 to form a substantially sealed envelope. There is no filler in the gap between the base 103 and the cylindrical part 104, but the gap is very small, and the base 103 is screwed into the spiral projection of the cylindrical part 104 and attached. So
The contact area between them is large, and they are in a substantially sealed state.

[0006] In particular, with respect to a bulb-type fluorescent lamp used for a waterproof lighting device such as an outdoor lighting device or a bathroom,
By making the envelope a substantially sealed type, it is possible to provide a waterproof type in which water droplets hardly penetrate into the internal lighting circuit.

[0007]

A conventional bulb-type fluorescent lamp having a substantially sealed envelope is a conventional type of fluorescent lamp having an enclosed envelope at the end of the life of a lighting circuit in the envelope or abnormal operation of the circuit. When the temperature rises, the internal air pressure rises, and the cover and gloves may be damaged. In order to suppress the rise of internal pressure, it is possible to evacuate the air inside the envelope by forming minute ventilation holes in the cover that constitutes the envelope, but circuit components cause tracking, If the internal pressure rises sharply due to excessive temperature rise,
It is conceivable that the venting through the ventilation holes cannot cope with the problem and damage the envelope.

In order to prevent such a phenomenon, it is conceivable to increase the diameter of the ventilation hole formed in the cover to increase the amount of ventilation. However, if the diameter of the ventilation hole of the cover is too large, the appearance of the bulb-type fluorescent lamp is reduced. As a result, the waterproof bulb-type fluorescent lamp has a problem that the waterproof effect cannot be obtained.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and suppresses a rise in the internal pressure in an envelope without impairing the appearance of the envelope even if the envelope is substantially a sealed type. An object of the present invention is to provide a bulb-type fluorescent lamp that can prevent damage to an envelope.

[0010]

According to a first aspect of the present invention, there is provided a bulb-type fluorescent lamp, which includes a light-emitting tube, a cover provided with a base for supporting the light-emitting tube, and a light-emitting tube housed in the cover. It is characterized by comprising a lighting device, a glove that covers the arc tube and is attached to the cover in a substantially sealed state, and ventilation means formed between the cover and the base. .

Definitions of terms in claim 1 and the following claims are based on the following description. As the arc tube, arc tubes having various shapes such as a double U and a triple U having a bent portion can be applied, but are not limited to these in view of the properties of the present invention.

The arc tube has a pair of filament electrodes sealed at both ends of an elongated glass bulb, a phosphor layer is coated directly or indirectly on the inner surface, and a discharge medium such as a rare gas and mercury is sealed inside. Are preferred. As the phosphor, a three-wavelength emission rare earth phosphor, a calcium halophosphate phosphor, or the like can be used. The arc tube may use a rare gas discharge that does not enclose mercury or may have an electrode outside.

As the lighting device, a high-frequency inverter type having a circuit board can be applied, but is not limited to this in view of the nature of the present invention. The lighting circuit is housed directly or indirectly attached to the cover.

As the base, a screw-in type called an E type is usually used, but the present invention is not limited to this. The base does not need to be directly attached to the cover, and may be indirectly attached to the case or a part of the cover may constitute the base.

The cover directly or indirectly supports the arc tube. As a means of indirect support,
It is preferable to mount a holder having a shape in which both ends of the arc tube can be inserted in a portion of the cover opposite to the direction in which the base is mounted.

The glove is substantially hermetically attached to the cover over the arc tube. The substantially closed state means that the cover and the glove are fixed with almost no gap by filling with a silicone adhesive, etc., and the cover and the glove do not have a heat radiation hole, so that the ventilation is enough to reduce the internal pressure. This means a configuration that includes those in which minute holes that have little effect are formed.

The glove may be light-diffusing or transparent as long as it has a light-transmitting property, and may be patterned or colored. The material of the glove may be either glass or plastic. The shape of the glove is arbitrary, but a so-called G similar to a generally used sphere is used.
A shape called a shape, a shape called a so-called T shape having a spherical tip and a cylindrical shape, or a pair shape (A shape) similar to the outer diameter shape of an incandescent lamp can be adopted. .

The ventilation means means a space formed in a portion of the cover and the base which is not visible from the outside, and includes a ventilation hole formed in a cover part near the base and visible from the outside. Absent. This is because such ventilation holes impair the appearance of the bulb-type fluorescent lamp. In addition, because of the presence of the ventilation holes, it cannot be applied to a waterproof bulb-type fluorescent lamp.
When a ventilation hole is formed as the ventilation means, it is desirable to form the ventilation hole inside the base which is not visible from the outside, and to provide a gap between the cover and the base such that the ventilation hole communicates outward. A space may be formed.

According to a second aspect of the present invention, there is provided a bulb-type fluorescent lamp, a cover provided with a base, which is attached and supported in a substantially sealed state with an end of the arc tube, and an arc tube accommodated in the cover. And a ventilation means formed between the cover and the base.

The cover directly or indirectly supports the arc tube in a substantially sealed state. As a means for indirectly supporting, it is preferable to mount a holder having a shape in which both ends of the arc tube can be inserted in a position opposite to the direction in which the base of the cover is mounted, also in a substantially sealed state. The arc tube is supported in a substantially sealed state. The substantially closed state is the same as that of claim 1 except that the cover (or holder) and the arc tube are fixed with almost no gap by filling with a silicone adhesive or the like.

According to the fluorescent lamp of the first or second aspect, even if the inside of the cover is in a substantially sealed state, it can be ventilated by the ventilation means formed between the cover and the base. Even if the internal air pressure inside the cover is excessively increased due to a rise in the temperature of the cover or the like, the cover or the like is not likely to be damaged, and the appearance is not impaired.

According to a third aspect of the present invention, in the light-bulb-shaped fluorescent lamp according to the first or second aspect, the ventilation means is formed between the base for mounting a base formed on the top of the cover and the base. It is characterized by having a gap.

The cylindrical portion is formed integrally with the top of the cover, and a base is attached with a certain gap between the cylindrical portion and the cylindrical portion to form a ventilation means. This gap is 1
Even if it is as small as mm or less, a large amount of ventilation can be secured if it is formed over almost the entire circumference of the cylindrical portion.

The ventilation means may be configured in combination with a ventilation hole formed in a cover in the base.

According to the third aspect of the invention, the ventilation means can be formed without providing a special ventilation hole.

According to a fourth aspect of the present invention, in the light bulb-shaped fluorescent lamp according to the third aspect, the base is an E-shaped base adaptable to an incandescent lamp socket, and the cylindrical portion has a substantially flat outer peripheral surface. It has a cylindrical shape.

The E-type base means an engine base socket specified in JIS C 7709.

The cylindrical portion has a cylindrical shape having a substantially flat outer surface without forming a ventilation hole and a spiral ridge.

According to the bulb-type fluorescent lamp of the fourth aspect, the ventilation means can be formed between the cover and the base except where the base is attached to the cover. Since it has a substantially flat cylindrical shape, the gap formed between the cover and the base can be increased, and the flow rate of air can be ensured.

The bulb-type fluorescent lamp according to claim 5 includes an arc tube,
While supporting the end of this arc tube via a partition plate,
A cover provided with a base, a lighting device for lighting an arc tube accommodated in the cover, and covering the arc tube,
A glove attached to the cover with an adhesive; and a ventilation means formed between the cover and the partition plate.

The ventilation means means a space formed in a portion between the cover and the partition plate which cannot be seen from the outer shape. In a bulb-type fluorescent lamp in which the silicone adhesive is filled all around between the cover and the partition plate, the airtightness of this part is higher than that of other parts, so the ventilation means suppresses an excessive rise in the pressure inside the cover. However, when using a single means, the diameter is increased so that the pressure can be reduced to the atmospheric pressure within a predetermined time. In the case of using two or more means, the ventilation means are arranged at equal intervals on the circumference.

According to the bulb-type fluorescent lamp of the fifth aspect, even if the inside of the cover is substantially closed, the ventilation can be performed by the ventilation means formed between the cover and the partition plate. Even if the internal pressure of the cover is excessively increased due to a rise in temperature or the like, the cover or the like is not likely to be damaged, and the appearance is not impaired.

According to a sixth aspect of the present invention, in the light bulb-shaped fluorescent lamp according to the fifth aspect, at least one glove is formed between the inner surface on the lower end side of the cover and the outer surface of the cylindrical portion of the partition plate. It is a non-filled area of the adhesive to be adhered.

According to the bulb-type fluorescent lamp of the sixth aspect, in forming the ventilation means, it is possible to prevent the area enclosed as the non-filled area from being filled with the adhesive during the filling with the silicone adhesive, so that the desired shape can be obtained. The ventilation means of the size can be formed very easily.

According to a seventh aspect of the present invention, in the lightbulb-shaped fluorescent lamp according to any one of the first to sixth aspects, the ventilation means is arranged such that the pressure inside the cover is 1.5 kgf / cm ^2. When the internal pressure of the cover is increased, the gas in the cover is released so as to be reduced to the atmospheric pressure within 2 seconds.

The pressure inside the cover is set to 1.5 kgf / cm ²
In order to ascend, a part of a base, for example, an eyelet of an E-shaped base is removed to form an opening, and air is flowed from the opening by a pump equipped with a pressure gauge. Then, when the internal pressure rises to 1.5 kgf / cm ² , the inflow of air is stopped, and it is measured how many seconds the pressure is reduced to the atmospheric pressure.

According to actual measurements by the discoverers, when the pressure inside the cover was increased to 1.5 kgf / cm ² in a substantially hermetic envelope composed of a PBT cover and a glass glove, it took 2 seconds. It was confirmed that the cover and the glove would not be damaged even if the temperature inside the cover was excessively increased in the case of a bulb-type fluorescent lamp provided with a ventilation means so as to reduce the pressure to atmospheric pressure within the range. However, in the case of the ventilation means which does not reduce the pressure to the atmospheric pressure even if the pressure inside the cover is increased to 1.5 kgf / cm ² and 2 seconds or more have elapsed, the temperature inside the cover is excessively increased. As a result, the internal pressure continued to rise and a part of the cover was cracked.

According to the bulb-type fluorescent lamp according to the seventh aspect, since the optimum configuration of the ventilation means is defined, breakage of the cover and the like can be more reliably prevented.

[0039]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an embodiment of a bulb-type fluorescent lamp according to the present invention.

FIG. 1 is a partial sectional view showing a compact fluorescent lamp according to the first embodiment.

A bulb-shaped fluorescent lamp 10 has a cover 14 having an E26 base 12.
And a lighting circuit 16 housed in the cover 14, a globe 17 having translucency, and an arc tube 18 housed in the globe 17. And glove 17
The envelope composed of the cover 14 and the cover 14 has a rated power of 60.
It is formed to have an outer shape that is close to the standard dimensions of a W incandescent lamp. That is, the lamp length H including the base 12 is 127 mm.
Degree, diameter, ie, outer shape D1 of globe 17 is 95 mm
Degree is formed. Hereinafter, the base 12 side is the upper side,
The glove 17 side will be described as a lower side.

The cover 14 is made of a heat-resistant synthetic resin, for example, polybutylene terephthalate (PBT). The cover 14 has a substantially cylindrical shape that expands downward, and a cylindrical tubular portion 15 having a substantially flat outer surface is integrally formed on the top of the upper end. The base 12 is put on the cylindrical portion 15 and the lower end of the base 12 is punched inward at several places on the circumference. The base 12 is fixed to the cover 14 by the inner end portions of the several base recesses 12 a deformed by the punch biting into the surface of the cylindrical portion 15.

Reference numeral 19 denotes a ventilation means, which is a base 12 and a cover 14.
Are formed by the gap formed between them. This gap is very small, less than 1 mm in a narrow place. However, since the outer surface of the cylindrical portion 15 is almost flat and the gap is formed over almost the entire circumference, it is necessary to secure a constant air flow rate. Can be. In addition, as long as a certain amount of ventilation is secured, there may be a portion where the aperture 12 and the cover 14 are partially in contact.

The globe 17 is transparent or milky white having light diffusivity, and is made of glass or synthetic resin.
It is formed into a smooth curved surface having substantially the same shape as the glass bulb of the incandescent lamp, and a cover 1 is provided on the edge of the opening.
A fitting edge 17a that fits inside the opening at the lower end of 4 is formed. The globe 17 may be combined with another member such as a diffusion film to improve the uniformity of luminance, or may be omitted.

The lighting circuit 16 as a lighting device housed in the cover 14 has a horizontal shape, that is, an arc tube 18.
Circuit board (PC board) 24 arranged perpendicular to the longitudinal direction of
A plurality of electrical components are mounted on both surfaces of the circuit board 24, that is, on the upper surface on the base 12 side and on the lower surface on the arc tube 18 side, to constitute an inverter circuit (high-frequency lighting circuit) for high-frequency lighting. ing.

On the upper surface of the circuit board 24, electric components such as an electrolytic capacitor and a film capacitor, which are relatively weak to heat, are arranged. On the lower surface, relatively high heat and small height. Chip-shaped electric components (chip components) are arranged. The chip-shaped electric component is a REC (rectifier element, diode bridge), transistor, resistor, or the like, and the thickness of the package is formed to be about 2 mm to 3 mm.

The circuit board is substantially disc-shaped and has a diameter smaller than a substantially circle of 40 mm. Then, a pair of wires (not shown) derived from the circuit board 24 is connected to the base 12 of the cover 14. One of the pair of wires is connected to an eyelet of the base 12, and the other is led out from a slit (not shown) formed in the cylindrical portion 15 between the inner side surface of the base 12 and the outer surface of the cylindrical portion 15. The lower edge of the base 12 and the cylindrical portion 1
Step portion 1 formed continuously at the lower part of 5 so as to have a large diameter
4a and is electrically connected.

The slit (not shown) is cut out so as to be continuous from the upper end of the cylindrical portion 15, and the lower end of the slit is located in the middle of the cylindrical portion 15 in the height direction. That is, the slit is not located below the lower edge of the base 12, and the slit cannot be visually recognized from the outside.
The appearance is not impaired, and there is no danger of water droplets entering.

The arc tube 18 has three tubes 31 of substantially the same shape.
Is arranged at a predetermined position, and sequentially connected by a communication pipe to form one discharge path, and an electrode provided with a filament coil or the like is provided at an end of the discharge path, The electrodes are connected to four lead wires led out of the arc tube 18 to the outside. Each of the tubes 31 has a phosphor film formed on an inner surface thereof and a rare gas such as argon and mercury sealed therein. And each tube 31
Is a glass cylindrical valve having an outer diameter of 10 mm and an inner diameter of 8 mm, that is, a wall thickness of 1 mm, and a bulb having a length of 110 mm is smoothly curved at an intermediate portion and formed in a substantially U-shape having a top portion. .

The arc tube 18 is a fluorescent lamp fixing member, and is attached to a partition plate 33 as a holder, which is a lighting circuit fixing member, and the partition plate 33 is fixed to the cover 14. That is, the partition plate 33 includes a disk-shaped substrate portion, and the end of each tube 31 is inserted into a mounting hole formed in the substrate portion and adhered with an adhesive, and the like. Is fixed to the partition plate 33. Also,
From the outer peripheral portion of the substrate portion of the partition plate 33, a fitting step portion that is directed upward and further outward is formed, and the fitting step portion is fitted inside the cover 14.

The silicone adhesive 37 is circumferentially filled with the fitting edge 17a of the glove 17 fitted to the cover 14 at the outer peripheral position of the partition plate 33, so that the cover 1
4 and glove 17 are fixed to each other.

One end of each tube 31 of the arc tube 18 is sealed with a line seal using a mount or a pinch seal without using a mount.
A thin tube 38, also called an exhaust pipe, is welded to the other end to exhaust air or to include amalgam as needed.

The electrodes formed at the ends of the respective tubes 31 located at both ends of the discharge path of the arc tube 18 are arranged such that a filament coil is supported by a pair of wells (introduction lines). . Then, each well is connected to the tube 31 via a dumet wire sealed to the glass at the end of the tube 31.
Is connected to a lead wire (not shown) led out of the circuit board 24, and this lead wire is electrically connected to an electric connection terminal of the circuit board 24. In addition, an auxiliary amalgam is provided in one of the wells as necessary.

In the state where the bulb-type fluorescent lamp 10 is assembled as described above, the arc tube 18 is housed at a predetermined position in the globe 17. That is, in this state, the tops of the respective tubes 31 are positioned at equal intervals on one circumference centered on a central axis whose longitudinal direction is the vertical direction of the bulb-shaped fluorescent lamp 10.

The bulb-shaped fluorescent lamp 10 thus configured has an input power rating of 14 W, is applied to the arc tube 18 at a high frequency of 12.5 W, the lamp current is 235 mA, and the lamp voltage is 54 V. The total luminous flux is 8101 m by using a three-wavelength light emitting phosphor.

According to the bulb-type fluorescent lamp of the present embodiment, even if the inside of the cover 14 is in a substantially sealed state, the ventilation can be performed by the ventilation means 19 formed between the cover 14 and the base 12. Even if the internal air pressure of the cover 14 rises excessively due to a rise in the temperature of the lighting circuit 16 or the like,
There is no possibility that the cover 14 or the glove 17 is damaged, and the appearance is not impaired because the ventilation hole is not formed in the cover 14 or the glove 17.

In particular, when tracking occurs due to deterioration of circuit components of the lighting circuit 16, the temperature inside the cover may rise excessively and the internal pressure may rise. The internal pressure also rises excessively due to decomposition products such as epoxy, which evaporate from the tracking portion.

In the above-described embodiment, the arc tube 18 is formed by connecting three U-shaped tubes 31. However, the shape of the arc tube 18 is not limited to this. Two, three, or four H-shaped pipes are juxtaposed, that is, four, six, or eight along the longitudinal direction.
An axial discharge path can be formed to shorten the lamp length.

FIG. 2 is a partial cross-sectional view showing a compact fluorescent lamp according to the second embodiment. Note that the same components as those of the first embodiment are denoted by the same reference numerals, and redundant description will be omitted.

The bulb-type fluorescent lamp of the present embodiment has no globe, so that the arc tube 18 is exposed.

A holder 33, which is a fixing member for the arc tube 18 and a lighting circuit fixing member, is attached to the cover 14 in a substantially hermetically sealed state.
It is fixed to. That is, the holder 33 includes a disk-shaped substrate portion, and inserts the end of each tube 31 into a mounting hole formed in the substrate portion and fills the gap with the silicone adhesive 37 without gaps. The arc tube 18 is fixed to the holder 33 in a substantially sealed state.

Also in the bulb-type fluorescent lamp of the present embodiment, a ventilation means (not shown) similar to that of the first embodiment is provided, so that even if the internal pressure of the cover 14 rises excessively, There is no risk of damage to the cover and the like, and since the ventilation holes are not formed in the cover 14, the appearance is not impaired.

The lighting circuit 16 is composed of one circuit board 2
Although 4 is arranged horizontally, a plurality of circuit boards may be provided.

FIG. 3 is a partial sectional view showing a compact fluorescent lamp according to the third embodiment. The globe 17 of the present embodiment is formed in a so-called pair shape (A shape). An arc tube 18 is housed in the globe 17.

FIG. 4 is a sectional view showing the details of the lower end of the cover 14. A partition plate 33 as a holder, which is a fluorescent lamp fixing member and a lighting circuit fixing member, is attached to a lower end in the cover 14. The partition plate 33 has a cylindrical portion 39 that is mounted on the side where the circuit board 24 is arranged with a gap between the circuit board 24 and the inner surface of the cover 14. The outer surface of the cylindrical portion 39, the inner surface of the cover 14, and the cylindrical portion 39
In a state in which the fitting edge 17a of the glove 17 is fitted into the space surrounded by the intermediate rib 40 protruding from the outer surface of the glove, the silicone adhesive 37 is filled except for a part of the circumference, and the cover 1
4 and glove 17 are fixed to each other.

As shown in FIG. 5, the cover 14 has two ribs 41 projecting from the inside to the inside at the lower end thereof, as shown in FIG. Each of the two ribs 41 is provided with a slit 42 for accommodating the fitting edge 17a of the glove 17. The glove 17 can be fixed at a position deep into the cover 14 by fitting with the slit 42 of the rib 41.

By keeping a space between the two ribs 41 where the silicone adhesive 37 is not filled, the ventilation means 19 communicating with the outside is formed as shown in FIG. The position of the ventilation means 19 is inside the cover 14 and cannot be seen from the outside.

According to the compact fluorescent lamp of the present embodiment, even when the inside of the cover 14 is in a substantially sealed state, it is formed between the inner surface of the cover 14 and the outer surface of the cylindrical portion 39 of the partition plate 33. Since the air can be ventilated by the ventilation means 19, which is a non-filled area of the silicone adhesive 37, even if the internal pressure of the cover 14 is excessively increased due to a rise in the temperature of the lighting circuit, the cover 14, the glove 17 and the like are damaged. Since there is no fear and no ventilation holes are formed in the cover 14 and the glove 17, the appearance is not impaired.

Further, in this embodiment, two or more ventilation means 19 can be provided on the same circumference. in this case,
As shown in FIG. 7, it is desirable to arrange the ventilation means 19 at equal intervals.

Then, the bulb-type fluorescent lamp 1 of each of the above-described configurations is used.
The lighting fixture is constructed by attaching 0 to a fixture main body having a socket for an incandescent lamp or the like. In this configuration, a lighting fixture having the effects of the above-described bulb-type fluorescent lamp 10 can be configured.

[0071]

According to the bulb-type fluorescent lamp of the first or second aspect, even if the inside of the cover is substantially closed, the ventilation can be performed by the ventilation means formed between the cover and the base. Even if the internal air pressure inside the cover is excessively increased due to a rise in the temperature of the lighting device or the like, the cover or the like is not likely to be damaged, and the appearance is not impaired.

According to the third aspect of the invention, the ventilation means can be formed without providing a special ventilation hole.

According to the bulb-type fluorescent lamp of the fourth aspect, even if the inside of the cover is substantially closed, it can be ventilated by the ventilation means formed between the cover and the partition plate. Even if the air pressure inside the cover is excessively increased due to a rise in temperature or the like, the cover or the like is not likely to be damaged, and the appearance is not impaired.

According to the bulb-type fluorescent lamp of the fifth aspect, in forming the ventilation means, it is possible to prevent the area enclosed as the non-filled area from being filled with the adhesive during the filling with the silicone adhesive so that the desired area can be obtained. The ventilation means of the size can be formed very easily.

According to the bulb-type fluorescent lamp of the sixth aspect, the ventilation means can be formed between the cover and the base except for the place where the base is attached to the cover, and the cylindrical portion has the outer surface. Has a substantially flat cylindrical shape,
The gap formed between the cover and the base can be increased, and the flow rate of ventilation can be ensured.

According to the bulb-type fluorescent lamp of the present invention, since the optimum configuration of the ventilation means is defined, breakage of the cover and the like can be prevented more reliably.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view showing a compact fluorescent lamp according to a first embodiment of the present invention.

FIG. 2 is a partial cross-sectional view illustrating a compact fluorescent lamp according to a second embodiment of the present invention.

FIG. 3 is a partial cross-sectional view illustrating a compact fluorescent lamp according to a third embodiment of the present invention.

FIG. 4 is a sectional view showing details of a lower end portion of the cover of FIG. 3;

FIG. 5 is a perspective view showing details of ribs of the cover of FIG. 3;

FIG. 6 is a sectional view taken along line XX of FIG. 4;

FIG. 7 is a cross-sectional view showing another ventilation means according to the third embodiment of the present invention.

FIG. 8 is a schematic cross-sectional view showing a conventional bulb-type fluorescent lamp having a substantially sealed envelope.

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 bulb-type fluorescent lamp 12 base 14 cover 16 lighting circuit as lighting device 17 globe 18 arc tube 19 ventilation means

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masahiko Asakura 4-3-1 Higashishinagawa, Shinagawa-ku, Tokyo Inside Toshiba Lighting & Technology Corporation (72) Inventor Hajime Osaki 4-3-1 Higashishinagawa, Shinagawa-ku, Tokyo Toshiba Lighting & Technology Corporation

Claims (7)

[Claims] 1. An arc tube; a cover supporting the arc tube and provided with a base; a lighting device for lighting an arc tube housed in the cover; A light bulb-type fluorescent lamp comprising: a glove attached in a substantially sealed state; and a ventilation means formed between the cover and the base. 2. An arc tube; and a cover provided with a base while supporting and supporting an end of the arc tube in a substantially sealed state;
A compact fluorescent lamp comprising: a lighting device for lighting an arc tube accommodated in a cover; and a ventilation means formed between the cover and the base. 3. The device according to claim 1, wherein the ventilation means is a gap formed between the base and a cylindrical portion for mounting a base formed on a top portion of the cover. Light bulb shaped fluorescent lamp. 4. The electric bulb according to claim 3, wherein said base is an E-shaped base adapted to a socket for an incandescent lamp, and said cylindrical portion has a substantially cylindrical shape with a flat outer peripheral surface. Shaped fluorescent lamp. 5. An arc tube; a cover supporting an end of the arc tube through a partition plate and provided with a base; and a lighting device for lighting the arc tube housed in the cover;
A bulb-shaped fluorescent light, comprising: a glove that covers the arc tube and is attached to the cover with an adhesive; and ventilation means formed between the cover and the partition plate. lamp. 6. The ventilation means is a non-filled area of at least one glove-wearing adhesive formed between a lower inner surface of the cover and an outer surface of a cylindrical portion of the partition plate. The bulb-type fluorescent lamp according to claim 5, wherein 7. When the pressure inside the cover is increased such that the pressure inside the cover becomes 1.5 kgf / cm ² , the ventilation means reduces the pressure to the atmospheric pressure within 2 seconds. The bulb-type fluorescent lamp according to any one of claims 1 to 6, wherein the bulb is formed so as to allow gas in the cover to escape.