JP2002015701A - Fluorescent lamps and lighting devices - Google Patents

Abstract

[PROBLEMS] To provide a fluorescent lamp provided with a translucent discharge vessel having a coolest part at a required temperature, and a lighting device using the same. A bent bent portion (1b) is formed in the middle of a light-transmissive discharge vessel (1) which is elongated and has a phosphor layer formed on an inner surface side. The bent portion 1b has a maximum width portion 1b1 substantially at the center in a cross section whose folded portion 1b1 is perpendicular to the discharge path.
In addition, a temporary width portion 1b12 having a width narrower in the vertical direction from the maximum width portion 1b11 is formed, and an upper side portion 1b2 protrudes in an arc shape in a front view. As a result, the distance between the center of the positive column in the bent portion 1b and the shoulder 1b3 of the bent portion 1b increases, and the current density of the discharge inside the shoulder decreases, so that the tube wall load of the shoulder 1b3 is reduced. The shoulder portion 1b becomes the coldest portion, and the temperature of the shoulder portion 1b decreases. Since the upper side 1b2 is arc-shaped, it is resistant to external impact.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluorescent lamp called a compact fluorescent lamp or a compact fluorescent lamp and a lighting apparatus using the same.

[0002]

2. Description of the Related Art In recent years, fluorescent lamps have been miniaturized due to environmental problems. In particular, the tendency is remarkable in the compact fluorescent lamp and the compact fluorescent lamp. However, since the total luminous flux is not reduced even when the size is reduced, the tube wall load is correspondingly increased.

When the tube wall load increases, the lamp temperature during lighting increases. Therefore, in order to prevent the luminous efficiency from lowering due to the mercury vapor pressure becoming too high, the mercury is sealed in the form of amalgam to increase the temperature at which the optimal vapor pressure of mercury approaches the lamp temperature. By setting or forming the coldest part in a part of the translucent discharge vessel, consideration is given so that the mercury vapor pressure approaches the optimum range even when the ambient temperature increases.

However, recently, as the size of lighting fixtures has been further reduced with the downsizing of fluorescent lamps, the ambient temperature at the time of lighting of fluorescent lamps has further increased, and the temperature of the coldest part has further decreased. There is a strong demand for

Conventionally, in a compact fluorescent lamp or a bulb-type fluorescent lamp, a folded portion is formed at an intermediate portion of a translucent discharge vessel, and the bent portion is formed using a mold to form a coldest portion. The technology that made the temperature drop,
For example, JP-B-2-53906 and JP-A-6-36
No. 743 and the like. According to this conventional technique, the upper side of the bent portion formed in the intermediate portion of the translucent discharge vessel is flat in front view, and has a triangular shape in which the upper side is a vertex in a cross section perpendicular to the discharge path. A flat portion is formed from the vertex to the front side and the back side.

[0006]

In the prior art,
There is a problem that the flat portion is easily dent due to high heat at the time of exhaustion. In order to prevent this, it was necessary to use a glass bulb in which the thickness of the translucent discharge vessel was relatively large. For this reason, there is also a problem that it is not compatible with the reduction in the diameter of the fluorescent lamp.

[0007] There is also a need for a translucent discharge vessel capable of providing a coldest part at a lower temperature than in the prior art.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a fluorescent lamp having a light-transmitting discharge vessel in which a coldest part having a desired temperature is formed, and a lighting device using the same.

Another object of the present invention is to provide a fluorescent lamp having a translucent discharge vessel in which a coolest portion resistant to external impact is formed, and a lighting device using the same.

[0010]

According to a first aspect of the present invention, there is provided a fluorescent lamp, wherein the bent portion has a maximum width portion substantially at the center in a cross section perpendicular to the discharge path. A temporary reduced width portion is formed in which the width is reduced from the large portion in both the up and down directions, and a bent portion having a shape in which an upper side protrudes in an arc shape in a front view is provided in the middle, and a bent portion is provided. An elongate light-transmitting discharge vessel, which is configured such that the coldest part is formed at both shoulders of the part and both ends are sealed; and a phosphor layer formed on the inner surface side of the light-transmitting discharge vessel. A discharge medium containing mercury and a rare gas sealed in a translucent discharge vessel.

In the present invention and each of the following inventions, definitions and technical meanings of terms are as follows unless otherwise specified.

<Translucent Discharge Vessel> The translucent discharge vessel may be elongated and sealed at both ends, and may have a bent portion folded in the middle. The number of is free. However, the present invention is suitable for a so-called compact fluorescent lamp and a compact fluorescent lamp. In these fluorescent lamps, the tube diameter is, for example, 15.5 mm, 1 in the case of a compact fluorescent lamp.
7.5mm, 20mm, 22mm and 24mm are used. In the case of a bulb-type fluorescent lamp, a tube diameter of generally 13 mm or less, preferably 5 to 10 mm, and more preferably 3 to 9 mm is suitable for further miniaturization.

The discharge path length of the translucent discharge vessel may be set to an appropriate length according to the lamp power. In the case of a compact fluorescent lamp, it can be appropriately selected from the range of about 200 to 2000 mm. In the case of a bulb-type fluorescent lamp, the discharge path length can be selected within the range of 200 to 500 mm. In the present invention, "discharge path length"
The term refers to an average length of the light-transmitting discharge container between a pair of electrodes described later sealed at both ends of the light-transmitting discharge container.

Further, the shape of the light-transmitting discharge vessel may be any one provided with one or a plurality of bent portions folded in the middle, and the remaining shape is completely free. In addition,
The term “bent portion” refers to a U-shaped portion formed by heating an intermediate portion of an elongated valve to bend it in a softened state and molding it using a mold.

For example, in the case of a compact fluorescent lamp, a translucent discharge vessel having a U-shape, M (or W) -shape, double U-shape, triple U-shape, quartet U-shape, etc. Can be used. When the translucent discharge vessel has a U-shape, one bent portion and two linear portions are formed on both sides thereof. In short, it is formed by a single U-shaped unit valve. In the case of an M (or W) shape, two or three bent portions and four linear portions are formed. In addition, the above-mentioned embodiment having two bent portions is a case where one of the three is constituted by the connecting pipe. In short, it is formed by connecting two U-shaped unit valves side by side on the same plane and connecting them in series. Furthermore, in the case of a triple U-shape, a shape in which three U-shaped unit valves are equally arranged along a virtual circle and arranged so as to form a substantially triangle, Refers to a shape that is arranged in a superimposed manner. Furthermore, in the case of a quartet U-shape, it means a shape that is arranged equally along four U-shaped unit valve imaginary circles or is arranged so as to be overlapped in front and back.

On the other hand, in the case of a bulb-type fluorescent lamp, a double U
A light-transmitting discharge container having a shape such as a letter shape, a triple U shape, and a quartet U shape can be used.

Further, the material of the translucent discharge vessel is not particularly limited as long as it has airtightness, workability and fire resistance, but soft glass generally used for this kind of fluorescent lamp is preferable. is there.

Next, the bent portion in the middle of the light-transmitting discharge vessel will be described.

The bent part is a folded part,
At least the center of the folded portion has the following shape in a cross section perpendicular to the discharge path. That is, there is a maximum width portion substantially at the center in the vertical direction. In addition, a provisionally reduced width portion is formed in which the width is reduced from the maximum width portion toward both the upper and lower directions. Therefore, the cross section has a diamond shape or a rugby ball shape as a whole.

When the bent portion is viewed from the front, the upper side protrudes in an arc shape. In addition, "the bending part was viewed from the front"
This means that a plane in which a pair of linear portions on both sides of the folded portion are in the same plane is viewed from the front.

<Regarding the Electrodes> The electrodes are disposed near both ends inside the translucent discharge vessel, and together with the translucent discharge vessel,
Form a discharge path.

As the electrode, a filament electrode, a ceramic electrode or the like can be used.

Further, in order to seal the electrodes at both ends of the translucent discharge vessel, an appropriate means such as a flare stem, a pinch seal stem, a button stem, etc. can be used. In addition,
The one in which a thin tube is connected to a stem for evacuation and sealing of a discharge medium can be used.

<Regarding Phosphor Layer> The phosphor layer may be formed by directly contacting the inner surface of the translucent discharge vessel, or indirectly via a protective film such as alumina and a reflective film such as titanium oxide. May be formed.

The phosphor to be used can be arbitrarily selected according to the purpose of illumination. For example, for general lighting purposes, a white light emitting phosphor such as a three-wavelength light emitting phosphor or a halophosphate phosphor can be used. For reading applications, rare earth phosphate phosphors (LaPO4: Ce3 +, Tb3 +) and BaAl12
A green-emitting phosphor such as O19: Mn can be used. Further, depending on the use, an ultraviolet light emitting phosphor or the like can be used.

<Discharge Medium> The discharge medium contains a rare gas and mercury.

The rare gas is used for facilitating the start of the discharge of the fluorescent lamp, and is filled with argon, krypton, etc. in a translucent discharge vessel of about several hundred to 1,000 Pa.

The mercury may be encapsulated in either liquid mercury or amalgam. In the case of amalgam, there are a high-temperature type and a low-temperature type in which the temperature of the optimal mercury vapor pressure is close to liquid mercury, and any of them may be used. When amalgam is used, the amalgam may be directly enclosed in the translucent discharge vessel, or may be kept in a narrow tube so that only the mercury vapor pressure acts in the translucent discharge vessel. . In addition to the main amalgam, an auxiliary amalgam made of a metal that adsorbs mercury vapor in a translucent discharge vessel such as indium and easily forms amalgam is used to accelerate the rise of mercury vapor pressure at startup. can do.

<Regarding the operation of the present invention> In the present invention, since the cross-sectional shape of the folded portion is the above-described shape, the center of the positive column at the folded portion is lower than the geometric center of the folded portion at the lower side of the folded portion. Biased to the side. This increases the distance between the center of the positive column at the bent portion and the shoulder at the folded portion. The fact that this distance is large means that the current density of the discharge inside the shoulder becomes small, the load on the wall of the shoulder is reduced, and the temperature of the shoulder is lowered accordingly, and it can be the coldest part. Means In addition, the coldest part having a sufficiently low temperature can be formed.

Further, since the cross-section of the folded portion of the bent portion has the predetermined shape as described in the claims, it is difficult for the inside of the bent portion to be filled up, so that the translucent discharge container is prevented from being damaged due to distortion. Can be.

Further, since the upper side of the folded portion in the middle of the translucent discharge vessel protrudes in an arc shape, a cross section perpendicular to the discharge path in the folded portion has a maximum width portion almost at the center, and Even in the shape that the width is narrowed from the large part in both up and down directions, it is resistant to external impact.

As described above, in the present invention, since the coldest part at the required temperature can be obtained, the mercury vapor pressure can be optimally controlled according to the reduction in the diameter of the fluorescent lamp and the size of the lighting equipment. .

The fluorescent lamp according to the second aspect of the present invention is the first aspect of the present invention.
In the fluorescent lamp described above, the bent portion is characterized in that the cross-sectional shape perpendicular to the discharge path is substantially vertically symmetric.

In the present invention, the above structure facilitates the formation of the bent portion. Moreover, the height of the bent portion can be increased by making the bent portion as flat as possible. Thus, the center of the positive column can be biased toward the lower side of the bent portion, so that the distance between the shoulder of the bent portion and the center of the positive column can be increased, and the temperature of the coldest portion can be reduced. .

A fluorescent lamp according to a third aspect of the present invention is provided with a folded portion in the middle, a narrow portion recessed from the outside near both shoulders of the bent portion, and having the narrowest portion on both shoulders of the bent portion. Is configured to form a cold part,
An elongated translucent discharge vessel having both ends sealed; a pair of electrodes sealed at both ends of the translucent discharge vessel; a phosphor layer formed on the inner surface side of the translucent discharge vessel; A discharge medium containing mercury and a rare gas sealed in the discharge vessel.

According to the present invention, the coldest part is formed at the shoulder by forming a concave narrow part near both shoulders of the bent part. That is, the recessed narrow portion forms the bent portion outside the both shoulders in a front view. In order to form a narrow portion, the bent portion can be formed at the same time as the bent portion. However, if necessary, it may be formed after forming the bent portion. The cross-sectional shape of the folded part of the bent part is circular, elliptical, teardrop-shaped, diamond-shaped,
Any desired shape such as a rugby ball shape can be adopted.

Thus, in the present invention, since the light-transmitting discharge vessel forms a narrow portion due to the recess near both shoulders of the bent portion provided in the middle thereof, the path of the positive column is forced by the narrow portion. The distance between the shoulder and the center of the positive column increases. For this reason, since the temperature of the coldest part formed at the shoulder becomes low, a desired coldest part temperature can be obtained.

The fluorescent lamp according to the fourth aspect of the present invention is the third aspect of the present invention.
In the fluorescent lamp described above, the bent portion is characterized in that the folded portion has an acute angle at the upper side in a cross section perpendicular to the discharge path.

According to the present invention, even if the upper side is flat and the thickness of the bulb is thin, the cross section of the folded portion of the bent portion is made strong as described above. However, by making the upper side project in an arc shape in a front view, the strength against an external impact can be further increased.

According to a fifth aspect of the present invention, there is provided a lighting device, comprising: a lighting device main body; and the fluorescent lamp according to any one of the first to fourth aspects disposed on the lighting device main body. I have.

In the present invention, the term "illumination device" is a broad concept including any device utilizing the light emission of a discharge lamp. For example, a backlight device such as a lighting fixture, a sign lamp, a liquid crystal, and a personal computer incorporating the same are provided. And various information devices such as a television receiver and a GPS device, and OA devices such as a copier, a facsimile and a scanner incorporating the image reading device and the image reading device.

[0042]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a front view, partially cut away and partially sectioned, showing a compact fluorescent lamp as a first embodiment of the fluorescent lamp of the present invention.

FIG. 2 is an enlarged front view of a main portion showing a bent portion.

FIG. 3 is an enlarged fragmentary end view showing the shape of a cross section perpendicular to the discharge path at the center of the folded portion of the bent portion.

In each figure, reference numeral 1 denotes a translucent discharge vessel;
2 is a pair of electrodes, 3 is a phosphor layer, 4 is amalgam, 5 is a base, and 6 is a spacer.

The translucent discharge vessel 1 is made of a soft glass tube having a tube diameter of 19 mm, and includes a tube length 41 including a base 5 described later.
0 mm. By bending one glass tube at the center, a pair of straight portions 1a and 1a and one bent portion 1b are provided, and a pair of flare stems 1c are provided at both ends and sealed.

The pair of straight portions 1a, 1a are arranged close to and parallel to each other, one end of which is hermetically closed by a flare stem 1c, and the other end of which is continuous with the bent portion 1b.

The bent portion 1b is formed by bending a single glass tube when it is sufficiently softened by heating, and by molding with a mold. At the time of molding, a phosphor layer 3 described later is formed on the inner surface side of the translucent discharge vessel 1 in advance, and the inside is filled with nitrogen at a pressure higher than the atmospheric pressure. As a result of the molding, as shown in FIG. 3, the bent portion 1b has a cross section perpendicular to the central discharge path of the folded portion 1b1, has a maximum width portion 1b11 substantially at the center, and has a vertical section from the maximum width portion 1b11. It has a shape in which a temporarily reduced width portion 1b12 that becomes narrower in the direction is formed. The provisionally reduced width portion 1b12 extends substantially linearly. Further, as shown in FIG. 2, the upper side 1b2 of the bent portion 1b projects in an arc shape in a front view. Reference numeral 1b3 indicates a shoulder.

The flare stem 1c is formed at both ends of a discharge path formed in the translucent discharge vessel 1, that is, a pair of straight portions 1a,
It is sealed at the other end of 1a, and has a pair of introduction wires 1c1 and thin tubes 1c2, 1c3. The thin tubes 1c2 and 1c3 are
Both are formed integrally with the flare stem 1c while communicating with the inside of the light-transmitting discharge vessel 1, and the outwardly protruding tip is sealed. Narrow tube 1c provided at one end of translucent discharge vessel 1
2 further includes a neck portion in the middle. The thin tube 1c3 provided at the other end of the translucent discharge vessel 1 does not have a neck.

The pair of electrodes 2 and 2 are connected between a pair of internal introduction lines 1c1 of the flare stem 1c.

The phosphor layer 3 is formed of a phosphor of a three-wavelength emission type, and is formed on the inner surfaces of the pair of linear portions 1a of the translucent discharge vessel 1.

In the translucent discharge vessel 1, argon is used as a rare gas, and bismuth Bi-tin Sn-mercury H is used as mercury.
The amalgam 4 consisting of g is enclosed.
The amalgam 4 is placed in the narrow tube 1c2 so that only the mercury vapor is supplied into the translucent discharge vessel 1.

The base 5 is mounted on the translucent discharge vessel 1 so as to hold both ends of the translucent discharge vessel 1. In addition, 5a is a base pin.

The spacer 6 is inserted between the pair of linear portions 1a, 1a of the translucent discharge vessel 1 to prevent the linear portion 1a from being damaged by vibration or impact.

The center of the positive column formed in the translucent discharge vessel 1 by lighting the fluorescent lamp is shown in FIG.
As shown by a dotted line in the figure, the distance between the shoulders 1b2 and 1b2 and the center of the positive column increases because the bias is biased toward the shortest distance in the bent portion 1b. Therefore, the temperature of the coldest part formed on the shoulder part decreases, and the mercury vapor pressure is controlled as required.

FIG. 4 is a graph showing the mercury vapor pressure characteristics of the first embodiment of the fluorescent lamp of the present invention together with those of the comparative example.

In the figure, the horizontal axis represents the ambient temperature (° C.), and the vertical axis represents the relative luminous flux. Curve A shows the mercury vapor pressure characteristic of the fluorescent lamp of the present embodiment, and curve B shows the mercury vapor pressure characteristic of the comparative example. In addition, the comparative example is
This has already been described in the section of the prior art.

As can be understood from the drawing, according to the present embodiment, the maximum luminous flux can be obtained at a higher ambient temperature than in the comparative example.

FIG. 5 is a partially sectional front view showing a bulb-type fluorescent lamp as a second embodiment of the fluorescent lamp of the present invention.

FIG. 6 is a plan view of the glove as seen through.

FIG. 7 is an enlarged fragmentary end view showing the shape of a cross section perpendicular to the discharge path at the center of the folded portion.

In each figure, the same parts as those in FIGS. 1 to 3 are denoted by the same reference numerals, and description thereof is omitted. The bulb-type fluorescent lamp includes a light emitting unit 7, lighting circuit means 8, cover 9, globe 10, and partition plate 11.

[Light Emitting Unit 7] The light emitting unit 7 includes a light-transmitting discharge vessel 1, a pair of electrodes 2, 2 and a phosphor layer (not shown). The translucent discharge vessel 1 includes four U-shaped unit bulbs BU having a bent portion 1b formed by folding a middle portion of a glass tube 1a having an outer diameter of 10 mm, and is connected in series by three connection tubes 1d. And each unit valve BU is formed so as to be evenly distributed on the circumference. The bent portion 1b of each unit valve BU has a cross-sectional shape as shown in FIG. 7 at the center of the folded portion 1b1. That is, the bent portion 1b has a cross section perpendicular to the center discharge path of the folded portion 1b1, and the maximum width portion 1b1
1 and a shape in which a temporary reduced width portion 1b12 having a width narrowing in the vertical direction from the maximum width portion 1b11 is formed. Since the provisionally reduced width portion 1b12 extends in a convex shape gently protruding outward, it has a shape like a rugby ball as a whole. Further, as shown in FIG. 5, the upper side 1b2 of the bent portion 1b projects in an arc shape in a front view.

Although not shown, a pinch seal portion is formed at each end of the translucent discharge vessel 1. And
The narrow tube protrudes to the outside through the pinch seal portion in an airtight manner. The thin tube communicates with the inside of the light-transmitting discharge vessel 1, and is used when exhausting the inside of the light-transmitting discharge vessel 1, filling a rare gas, and storing main amalgam (not shown). You. The connecting pipe 1d is formed by a blow-down method.

The electrode 2 is constituted by a filament electrode. The electrode 2 is formed by coating a double coil made of a tungsten wire with an oxide of an electron emitting material made of an alkaline earth metal.

The phosphor layer is mainly composed of a three-wavelength light emitting phosphor, and is formed on the inner surface side of the translucent discharge vessel 1 through a protective film mainly composed of alumina fine particles (not shown). Have been.

[Lighting Circuit Means 8] The lighting circuit means 8 is mainly composed of a half-bridge type inverter. The light-emitting unit 7 is energized by high-frequency alternating current to light it, and is housed in a cover 9 described later. The high-frequency output terminal is connected to the fluorescent lamp 1 as required, as will be described later. The lighting circuit means 8 includes a wiring board 8a and a circuit component 8b mounted thereon. The main circuit component 8b is mounted on the lower surface of the wiring board 8a in the figure. on the other hand,
Since the circuit component 8b has an inverted truncated conical shape in the cavity inside the cover 9, the wiring board is formed so as to have a generally inverted conical shape with the circuit component, such as a tall capacitor, as the apex. 2a. Further, the pair of switching means is composed of a drain-exposed molded package type MOSFET having a DIP terminal.

[Regarding Cover 9] The cover 9 is formed by molding a white light-shielding heat-resistant synthetic resin into a cup-shaped cylinder. Then, the base end 9a is narrowed down narrowly,
b is open and the inside forms a cavity for housing circuit components.

[Regarding the base 5] The base 5 is made of an E26 type screw base, and is attached to the base end 9a of the cover 9 by crimping with a punch. The input end of the lighting circuit means 8 is connected to the center contact of the base 4 and the base shell.

[About Globe 10] Globe 10
Has a milky white light diffusing property by applying light diffusing fine particles to the inner surface of a transparent glass bulb, has an A shape, and surrounds the light emitting portion 7. Then, the base end of the globe 10 is connected to the opening at the tip of the cover 9, and the globe 10 and the cover 9 form an envelope AJ.

[About the partition plate 11] The partition plate 11
Supports the light emitting unit 7 and the wiring board 8a, and divides the inside of the envelope AJ into a light emitting room A and a lighting circuit storage room B.

The partition plate 11 has the following structure for supporting the light emitting section 7 and the lighting circuit means 8 and fixing the same together with the globe 10 to the cover 9.

That is, the partition plate 11 has a cylindrical portion 11 a and a cylindrical portion 11
and a flange 11b protruding outside of a. And
An insertion hole (not shown) is formed in the top surface 11a1 of the cylindrical portion 11a to insert the vicinity of the seal portion at both ends of the bulb unit BU of the translucent discharge container 1 of the light emitting unit 7, and the bulb unit BU is formed.
The light emitting part 7 is supported and fixed to the partition plate 11 by inserting the vicinity of the seal part and bonding with a silicone adhesive (not shown).

The wiring board 8a is inserted and supported inside the lower end of the cylindrical portion 11a of the partition plate 11.

Further, the partition plate 11 is arranged such that the flange 11b of the partition plate 11 comes into contact with the inner surface near the opening of the cover 9.
Is inserted into the cover 9 and is fixed by a silicone adhesive (not shown) in a state where the open end of the glove 10 is inserted into the open end of the cover 9 from above.

FIG. 8 is an enlarged front view of a main part showing a third embodiment of the fluorescent lamp of the present invention.

FIG. 9 is an enlarged fragmentary end view showing the shape of a cross section perpendicular to the discharge path at the center of the folded portion of the bent portion.

In each figure, the same parts as those in FIGS. 1 to 3 are denoted by the same reference numerals, and description thereof will be omitted.

In this embodiment, the coldest portion is formed at the shoulder portion 1b3 of the bent portion 1b by providing the narrow portion 1e recessed from the outside in the vicinity of the bent portion 1b of the translucent discharge vessel 1. It is like that. The cross section of the bent portion 1b perpendicular to the discharge path of the folded portion 1b1 is shown in FIG.
As shown in FIG.

Then, the center of the positive column is deflected to the inside of the bent portion 1b as shown by the dotted line due to the narrow portion 1e formed in the vicinity of the bent portion 1b. The distance d from the center of the positive column shown increases,
Therefore, the temperature of the coldest part decreases.

FIG. 10 is an enlarged fragmentary end view showing a cross section perpendicular to the discharge path at the center of the bent portion of the bent portion of the fourth embodiment of the fluorescent lamp of the present invention.

In each figure, the same parts as those in FIG. 9 are denoted by the same reference numerals, and description thereof will be omitted. This embodiment is different from the third embodiment shown in FIG. 9 in that a cross section of the bent portion 1b perpendicular to the discharge path of the folded portion 1b1 has a teardrop shape. That is, the upper side 1b2 of the bent portion 1b has an acute angle in a cross section perpendicular to the discharge path.

FIG. 11 is a front view showing a wall-mounted lamp using a bulb-type fluorescent lamp as an embodiment of the lighting device of the present invention.

In the figure, reference numeral 11 denotes a lighting device main body, and reference numeral 12 denotes a bulb-type fluorescent lamp.

The lighting device main body 11 is made of earthenware, has a hollow interior, has an open lower surface, and has a mounting portion formed on a side surface. Further, a lamp socket 11a is provided inside.

The bulb-type fluorescent lamp 12 is shown in FIGS.
However, the difference is that the globe 10 and the cover 9 as a whole have a so-called G shape which is substantially spherical. And the base is the lighting device main body 11.
The light-bulb-shaped fluorescent lamp 12 is mounted on the lighting device main body 11 by being inserted into the interior from the lower surface of the lighting device 11 and screwed into the lamp socket 11a.

[0088]

According to the first aspect of the present invention, an intermediate portion of an elongated translucent discharge vessel in which a phosphor layer is formed on an inner surface side is provided.
A folded portion is formed, and the bent portion has a maximum width portion substantially at the center in a cross section perpendicular to the discharge path, and further narrows from the maximum width portion in the vertical direction. The temporary width portion is formed, and the upper side protrudes in an arc shape in a front view, so that the distance between the center of the positive column at the bent portion and the shoulder portion of the bent portion increases, Because the current density of the discharge inside the part becomes small, the tube wall load on the shoulder part decreases,
As a result, a fluorescent lamp whose shoulder is the coolest part and whose temperature is low can be provided.

According to the second aspect of the present invention, since the cross-sectional shape of the bent portion perpendicular to the discharge path is substantially vertically symmetrical, molding is easy, and the bent portion is made as flat as possible. And the center of the positive column can be biased toward the lower side of the bent part, so the distance between the shoulder of the bent part and the center of the positive column was increased, and the temperature of the coldest part was lowered. A fluorescent lamp can be provided.

According to the third aspect of the present invention, there is provided a fluorescent lamp having a coldest portion having a low temperature at the shoulder portion by forming the recessed narrow portion near both shoulder portions of the bent portion. be able to.

According to the fourth aspect of the present invention, since the folded portion of the bent portion has an acute angle in the cross section perpendicular to the discharge path, the upper portion is flat and the thickness of the bulb is reduced. Even if it is thin, it is possible to provide a fluorescent lamp that is strong against external impact.

According to the fifth aspect of the present invention, it is possible to provide a lighting device having the effects of the first to fourth aspects.

[Brief description of the drawings]

FIG. 1 is a partially cutaway partially sectional front view showing a compact fluorescent lamp as a first embodiment of a fluorescent lamp according to the present invention;

FIG. 2 is an enlarged front view of a main part showing a bent portion of the same.

FIG. 3 is an enlarged main part end view showing the shape of a cross section perpendicular to the discharge path at the center of the folded part of the bent part.

FIG. 4 is a graph showing the mercury vapor pressure characteristics of the first embodiment of the fluorescent lamp of the present invention together with those of the comparative example, also showing an enlarged cross-sectional shape perpendicular to the discharge path at the center of the folded portion of the bent portion. Main part end view

FIG. 5 is a partial cross-sectional front view showing a bulb-type fluorescent lamp as a second embodiment of the fluorescent lamp of the present invention.

FIG. 6 is a plan view similarly showing the glove.

FIG. 7 is a partial cross-sectional front view showing a bulb-type fluorescent lamp as a second embodiment of the fluorescent lamp of the present invention.

FIG. 8 is an enlarged front view of a main part showing a third embodiment of the fluorescent lamp of the present invention.

FIG. 9 is an enlarged end view of the main part showing the shape of a cross section perpendicular to the discharge path at the center of the folded part of the bent part.

FIG. 10 is an enlarged fragmentary end view showing the shape of a cross section perpendicular to the discharge path at the center of the folded portion of the bent portion of the fourth embodiment of the fluorescent lamp of the present invention.

FIG. 11 is a front view showing a wall-mounted lamp using a bulb-shaped fluorescent lamp as one embodiment of the lighting device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Translucent discharge container 1a ... Linear part 1b ... Bend part 1b1 ... Folding part 1b2 ... Top side part 1b3 ... Shoulder part 1c ... Flare stem 1c1 ... Internal introduction line 1c2 ... Thin tube 1c3 ... Thin tube 2 ... Electrode 3 ... Phosphor layer 3A1: Neck part 4: Amalgam 5: Base 5a: Base pin 6: Spacer

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Kazuo Egawa 4-3-1, Higashishinagawa, Shinagawa-ku, Tokyo Toshiba Litec Corporation F-term (reference) 5C043 AA12 AA20 CC09 CD10 DD01 EA02 EA06

Claims (5)

[Claims] 1. A folded portion, wherein the folded portion has a maximum width portion substantially at the center in a cross section perpendicular to the discharge path, and the width decreases from the maximum width portion in both up and down directions. With the provisional width part being formed,
In the front view, an upper side portion is provided with a bent portion having a shape protruding in an arc shape in the middle, the coldest portion is formed at both shoulder portions of the bent portion, and both ends are sealed. A pair of electrodes sealed at both ends of the light-transmitting discharge container; a phosphor layer formed on the inner surface side of the light-transmitting discharge container; And a discharge medium containing enclosed mercury and a rare gas. 2. The fluorescent lamp according to claim 1, wherein the bent portion has a substantially vertical symmetrical cross section perpendicular to the discharge path. 3. A bent portion is provided in the middle, and a narrow portion recessed from the outside near both shoulder portions of the bent portion is provided, and a coldest portion is formed on both shoulder portions of the bent portion. An elongated light-transmitting discharge vessel having both ends sealed; a pair of electrodes sealed at both ends of the light-transmitting discharge vessel; and a phosphor layer formed on the inner surface side of the light-transmitting discharge vessel. And a discharge medium containing mercury and a rare gas sealed in a translucent discharge vessel. 4. The fluorescent lamp according to claim 3, wherein the bent portion has an acute-angled upper side in a cross section in which the folded portion is perpendicular to the discharge path. 5. A lighting device main body; and a fluorescent lamp according to claim 1 disposed on the lighting device main body;
A lighting device, comprising: