JP2010251260A - Discharge lamp - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a discharge lamp including a double-spiral-shape light emitting tube for which a socket is commonly usable to the utmost extent. <P>SOLUTION: The fluorescent lamp 2 includes the light emitting tube 4 having electrodes inside both ends of a double-spiral-shape glass tube 12 which has glass tube portions ranging from the center in the axial direction of the glass tube 12 sealed at both ends in air tightness to both ends thereof and spirally formed in the same plane, and bases 6 each mounted at both ends of the glass tube 12. The base 6 has a base body 44 formed in a bottomed cylindrical shape of a cylinder part and a bottom part and fitted to the end of the glass tube 12, and a pair of base pins 50, 52 erected outward from the bottom part of the base body 44. The cylinder part is formed in a two-stage cylindrical shape of a small-diameter cylinder portion 46 near the base pins 50, 52 and a large-diameter cylinder portion 48 ranging therefrom, and the size of its inner diameter B1 near the opening end of the large-diameter cylinder portion 48 is such that a fitting allowance is added to the outer diameter of the glass tube 12. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a discharge lamp, and more particularly to a discharge lamp having a double spiral arc tube.

  A fluorescent lamp, which is a kind of discharge lamp having a double spiral arc tube, in which each of the arc tube portions from the tube axial center of the arc tube to the ends of both tubes is spirally formed, Compared to a fluorescent lamp having an annular arc tube, it is suitable for miniaturization. If the total length of the conventional fluorescent lamp and the arc tube is the same, the double spiral shape allows the double spiral arc tube to be accommodated in the space inside the conventional annular arc tube. is there.

  Fluorescent lamps having a double spiral arc tube have already been commercialized as low W (watt) types such as 15 [W] and 20 [W]. Commercialization of types is under consideration.

JP 2006-49272 A

  By the way, one of the sockets to which the cap of the spiral fluorescent lamp is attached is as follows. That is, it has a bottomed cylindrical body part, and a pair of pin holes in which contact pieces are embedded are formed in the bottom part of the body part. In a state where the base is mounted on such a socket, each of the pair of base pins is inserted into the pin hole, and the outer peripheral part of the base having the same cylindrical shape is inserted into the cylindrical part of the socket.

Here, the spiral fluorescent lamp achieves high efficiency by optimizing the relationship between the arc tube length and the tube diameter for each rated power. Therefore, the pipe diameter is different for each rated power.
Therefore, when the shape of the cap of such a spiral fluorescent lamp follows the shape of the cap of a conventional straight tube fluorescent lamp, that is, when a simple cup shape (bottom cylindrical shape) is used, Since the outer diameter of the glass tube varies depending on the outer diameter of the glass tube, it is necessary to produce the socket described above accordingly.

However, an increase in the number of types of sockets is not preferable from the viewpoints of sharing parts and reducing costs in order to achieve a higher W (watt) type product.
An object of this invention is to provide the double spiral discharge lamp provided with the nozzle | cap | die which can share a socket as much as possible in view of the above-mentioned subject.

In order to achieve the above object, the discharge lamp according to the present invention is such that each of the glass tube portions extending from the central portion in the axial direction of the glass tube whose both ends are hermetically sealed to both ends of the tube is swirled within the same plane. A discharge lamp comprising an arc tube in which electrodes are provided in both ends of a double spiral glass tube formed in a shape, and a base attached to each of both ends of the glass tube, The base is
It has a bottomed cylindrical shape composed of a cylindrical part and a bottom part, and has a base body fitted on the end of the glass tube, and a pair of base pins erected outward from the bottom part of the base body, The cylindrical portion has a two-stage cylindrical shape composed of a small-diameter cylindrical portion near the cap pin and a large-diameter cylindrical portion connected thereto, and an inner diameter of the large-diameter cylindrical portion near the opening end. Is a size obtained by adding a fitting allowance to the outer diameter of the glass tube.

  According to the discharge lamp having the above-described structure, it has a bottomed cylindrical base body having a cylindrical portion and a bottom portion and a pair of base pins standing outward from the bottom portion, and is attached to the end portion of the arc tube. Since the cylindrical portion of the base is formed in a two-stage cylindrical shape composed of a small-diameter cylindrical portion near the base pin and a large-diameter cylindrical portion connected to the small-diameter cylindrical portion, (1) the small-diameter cylindrical portion The outer diameter can be adapted to the inner diameter of the cylindrical part of the socket to which the base is mounted, and (2) the inner diameter of the large diameter cylindrical part close to the opening end is fitted to the outer diameter of the glass tube Since the size is increased, the outer diameter of the small-diameter cylindrical portion can be adapted to the inner diameter of the cylindrical portion of the socket regardless of the outer diameter of the glass tube (luminous tube). This makes it possible to share a socket having a bottomed cylindrical main body as much as possible between discharge lamps having different outer diameters of glass tubes because of different rated powers.

The perspective view which shows schematic structure of the double spiral fluorescent lamp which concerns on embodiment Front view of arc tube of the fluorescent lamp The perspective view of the holder which the said fluorescent lamp has The perspective view of the 1st nozzle | cap | die which the said holder has Sectional view of the first cap It is a figure which shows the state by which the tube end part of the said arc tube was inserted in the said 1st nozzle | cap | die, and the figure which cut and drew the 1st nozzle | cap | die (A) is the sectional view on the AA line in FIG. 6, (b) is the figure which looked at the said 1st nozzle | cap | die in the direction of the arrow E in FIG. Illustration for explaining plug-in socket Diagram for explaining rotary socket The figure for demonstrating the magnitude | size of an outer diameter required for the small diameter cylindrical part of the said 1st nozzle | cap | die. Diagram showing the relationship between rated power and glass tube outer diameter and dimensions of the base

Hereinafter, embodiments of a discharge lamp according to the present invention will be described with reference to the drawings taking a fluorescent lamp as an example.
<Overall configuration of fluorescent lamp>
FIG. 1 is a perspective view showing a schematic configuration of a double spiral fluorescent lamp 2 (hereinafter simply referred to as “fluorescent lamp 2”) according to an embodiment.

As shown in FIG. 1, the fluorescent lamp 2 includes a luminous tube 4 having a double spiral shape and a holder 10 having a pair of caps 6 and 8.
<Arrangement of arc tube>
FIG. 2 shows a partially cutaway plan view of the arc tube 4. The arc tube 4 has a glass tube 12 hermetically sealed at both ends. As a material of the glass tube 12, for example, barium / strontium silicate glass (lead-free glass and soft glass) can be used. The cross section of the main part which occupies most of the full length of the glass tube 12 is circular. A phosphor layer 14 is formed on the inner peripheral surface of the glass tube 12. Further, in the glass tube 12, in addition to a predetermined amount of mercury (for example, 5 [mg]), a mixed gas as a buffer gas (for example, a mixed gas composed of argon gas and krypton gas mixed at a ratio of 90:10), Is sealed at a predetermined sealing pressure (for example, 400 [Pa]) (both not shown).

The glass tube 12 has a double spiral shape in which each portion of the glass tube 12 extending from the tube axis direction central portion 16 to both tube end portions 18 and 20 is formed in a spiral shape. Therefore, the arc tube 4 also has a double spiral shape as a whole.
Both ends of the glass tube 12 are sealed by pinch processing. In FIG. 2, the sealing portion corresponding to the tube end portion 18 is referred to as a first sealing portion 24, and the sealing portion corresponding to the tube end portion 20 is referred to as a second sealing portion 26.

A first lead wire 30 and a second lead wire 32 of the first electrode 28 are supported on the first sealing portion 24.
The inside of the glass tube 12 of the first introduction line 30 and the second introduction line 32 is bundled with glass beads 34. A coil 36 coated with an emitter (not shown) is bridged between the ends of the first lead wire 30 and the second lead wire 32 inside the glass tube 12.

The first introduction line 30 and the second introduction line 32 are led out of the glass tube 12 from the first sealing portion 24.
What is indicated by reference numeral “38” is a portion where a part of the exhaust pipe used in the exhaust process in the glass tube 12 remains in a series of manufacturing processes of the fluorescent lamp 2. Here, the remaining portion of the exhaust pipe protruding (extending) from the first sealing portion 24 by the pinch process is referred to as “exhaust pipe remaining portion 38”.

Although the second electrode 40 is provided on the second sealing portion 26 side of the glass tube 12, the second electrode 40 has the same configuration as the first electrode 28. Constituent members appearing in the drawing of the electrode 40 are denoted by the same reference numerals as those of the first electrode 28, and description thereof is omitted.
<Configuration of holder>
(overall structure)
FIG. 3 is a perspective view showing a schematic configuration of the holder 10.

  The holder 10 has an elongated plate-like connecting plate 42 and a first base 6 and a second base 8 provided corresponding to each of both ends of the connecting plate 42. The holder 10 is made of an integrally molded product of synthetic resin, except for the cap pins 50 and 52 described later. As the synthetic resin, PET (polyethylene terephthalate) or PBT (polybutylene terephthalate) can be used. Instead of integral molding, the connecting plate 42, the first base 6 and the second base 8 are individually manufactured, and these three members are fixed by a fixing means such as an adhesive or a fastening means such as a screw or a rivet. It does not matter if they are joined together.

The 1st nozzle | cap | die 6 and the 2nd nozzle | cap | die 8 are the same structures except the direction with respect to the connection board 42 differing. Therefore, hereinafter, the detailed configuration of the first base 6 will be described as a representative, and the same reference numerals will be given to the same components as those of the first base 6 for the second base 8, and the description thereof will be omitted. To do.
(Composition of base)
4 is a perspective view of the first base 6, and FIG. 5 is a cross-sectional view of the first base 6 shown in FIG. 4.

  The first base 6 has a base body 44 having a bottomed cylindrical shape. The base body 44 includes a small-diameter cylindrical portion 46 having a bottomed cylindrical shape and a large-diameter cylindrical portion 48 that is connected to the opening end side of the small-diameter cylindrical portion 46 and has a larger diameter than the small-diameter cylindrical portion 46. It has a two-stage cylindrical shape. The term “cylinder” as used herein is intended to include not only a circular cross section but also a slightly flat shape, for example, an elliptical shape. The reason for the two-stage cylindrical shape will be described later.

  A pair of cap pins 50 and 52 are planted on the bottom 46A of the small-diameter cylindrical portion 46 and are erected outward. The base pins 50 and 52 are hollow pins made of a copper alloy or other metal. The base pin 50 and the base pin 52 are planted, for example, with an interval of 5 [mm] (a distance between the axial centers of both base pins). This interval is constant regardless of the rated power [W] of the fluorescent lamp.

  Ribs 54, 56, and 58 project from the inner peripheral surface of the large-diameter cylindrical portion 48 near the small-diameter cylindrical portion 46. The ribs are also provided on the inner peripheral surface portion of the large-diameter cylindrical portion 48 facing the ribs 54, 56, and 58. This will be described with reference to FIG. FIG. 7A is a cross-sectional view taken along the glass tube 12 near the first base 6 in a state where the first base 6 is attached to the arc tube 4 (the first base 6 is not cut). ). Note that members (such as the first electrode 28) that appear in the background of the cross section in the arc tube 12 are not shown.

On the inner peripheral surface of the large-diameter cylindrical portion 48, ribs 60, 62, and 64 project from the positions facing the ribs 54, 56, and 58. The ribs 54, 56, 58 and the ribs 60, 62, 64 have a function as a support member that supports the first sealing portion 24 of the arc tube 4 as will be described later.
<Attachment structure of arc tube and base>
With reference to FIGS. 6 and 7 (a), the mounting structure of the arc tube 4 and the caps 6 and 8 will be described. The first base 6 (FIG. 3) is attached to the pipe end 18 (FIG. 2), and the second base 8 is attached to the pipe end 20 (FIG. 2). The first cap 6 will be described as a representative.

FIG. 6 is a view showing a state in which the tube end portion 18 of the arc tube 4 is inserted into the first base 6, and is a view drawn by cutting out the first base 6, and FIG. 6 is a cross-sectional view taken along line AA in FIG.
As shown in FIG. 6, the first lead-in wire 30 is inserted into the base pin 50 and joined within the base pin 50 by solder (not shown). Although not shown in the drawing, the second lead-in wire 32 is inserted into the cap pin 52 and soldered in the same manner.

The first sealing portion 24 is supported by the ribs 54, 56, and 58 and the ribs 60, 62, and 64 that face each other inside the large-diameter cylindrical portion 48.
A portion other than the first sealing portion 24 in the tube end portion 18, that is, a portion that maintains the outer diameter of the glass tube before sealing (hereinafter referred to as “sealing adjacent portion 66”) has a large diameter. It is located on the peripheral surface where the ribs 54, 56, 58, 60, 62, 64 in the cylinder 48 are not formed.

The base body 44 is filled with silicone resin (not shown), whereby the arc tube 4 (tube end portion 18) and the first base 6 are substantially joined.
<About socket>
Two main types of sockets in which the first cap 6 and the second cap 8 are mounted will be described.
(Plug-in socket)
The socket 100 to which the first cap 6 and the second cap 8 are mounted will be described with reference to FIG. The socket 100 is provided in a lighting fixture (not shown).

The socket 100 has a main body portion 102 having a bottomed cylindrical shape. A pair of pin holes 106 and 108 embedded with contact pieces (not shown) are formed in the bottom 104 of the main body 102. The contact pieces embedded in the pin holes 106 and 108 are electrically connected to the lead wires 110 and 112 by soldering or the like, respectively.
The socket 100 is mounted by fitting the main body portion 102 to the small diameter cylindrical portion 46 of the first base 6 in the direction of arrow B. At this time, the cap pins 50 and 52 are inserted into the pin holes 106 and 108, respectively, and are electrically connected to contact pieces (not shown) embedded therein.

(Rotary socket)
Another type of socket 120 to which the first cap 6 and the second cap 8 are attached will be described with reference to FIG.
The socket 120 is rotatably housed inside a main body part 122 fixed to a luminaire main body (not shown) and a cylindrical holding part 124 formed in the main body part 122 and opened to the first base 6 side. A rotating body 126 having a substantially C-shaped cross section is housed so as to be rotatable. An operation lever 130 that protrudes through a notch 128 formed in the front wall portion of the holding portion 124 is provided at the circumferential end of the rotating body 126. A pair of contacts (not shown) are fixed on the inner surface of the rotating body 126.

  To attach the first base 6 to the socket 120, as shown in FIG. 9A, the pair of base pins 50 of the first base 6 with the C-shaped rotating body 126 opened downward. , 52 are inserted into the rotating body 126, and then each rotating body 126 is rotated by operating the operating lever 130 as shown in FIG. The pair of base pins 50 and 52 are held by the unillustrated), and the pair of contacts and the pair of base pins 50 and 52 are electrically connected.

To remove the first cap 6 from the socket 120, the reverse operation is performed. Needless to say, one socket 120 is provided for each of the first base 6 and the second base 8, and the first base 6 and the second base 8 are attached to and detached from the pair of sockets 120 at the same time. .
<Dimensions of each part of the base>
Before explaining the dimensions of each part of the base, the reason why the base body 44 (FIG. 4) has a two-stage cylindrical shape will be described. As described above, some lighting apparatuses for double spiral fluorescent lamps use the plug-in type socket 100 shown in FIG. Therefore, when the base attached to this is followed by the base of a conventional straight tube type fluorescent lamp and made into a simple cup shape (bottom cylindrical shape), the outer diameter of the base is the outer diameter of the glass tube. Since it is different for each, it is necessary to make a socket (plug-in type) according to this.

  However, this is not preferable from the viewpoint of cost reduction by sharing the socket. Therefore, in the present embodiment, a two-stage cylindrical shape is formed of a portion (small-diameter cylindrical portion 46) that fits into the plug-in socket and a portion (large-diameter cylindrical portion 48) that fits the glass tube. That is, the small-diameter cylindrical portion 46 has a certain size regardless of the outer diameter of the glass tube within a certain range, and the large-diameter cylindrical portion 48 has a size corresponding to the outer diameter of the glass tube, so It was decided to share this.

  Next, the dimensions of each part will be described with reference to FIG. In FIG. 11, φA is the outer diameter of the small diameter cylindrical portion 46 shown in FIG. 7B, and φB1 and φB2 are the portions near the opening end of the large diameter cylindrical portion 48 (see FIG. 7A). ..., 64), φB1 is an inner diameter in a direction perpendicular to the plane around which the glass tube 12 is wound in a spiral shape, and φB2 is a direction parallel to the plane. Of the inner diameter. FIG. 7B is a view of the first base 6 viewed in the direction of arrow E in FIG. In addition, each of the rated power shown in FIG. 11 does not include the lower limit value but includes the upper limit value. For example, “7 to 25 [W]” means “more than 7 [W] and not more than 25 [W]”.

(Small diameter cylindrical part outer diameter φA)
φA will be described with reference to FIG. FIG. 10 is a view showing a state in which the first base 6 is mounted on the rotary socket 120 shown in FIG. 9, and the outline of the socket 120 is indicated by a chain line.
According to Japanese Industrial Standards JISC7709, the shortest distance to the base pin on the base surface that can be touched by a human finger in a state where the base is mounted on the socket is defined by the voltage that can be applied to the base pins 50 and 52. Yes. The shortest distance varies depending on whether the voltage is 300 [V] or less or exceeds 300 [V].

The interval D between the cap pin 50 and the cap pin 52 is constant at 5 [mm] regardless of the rated power [W]. Therefore, according to the above standard, the minimum necessary φA is determined.
As shown in FIG. 11, when the rated power exceeds 7 [W] and is 50 [W] or less (group L), the voltage that can be applied to the base pin is 300 [V] or less, and therefore φA is approximately 12 [Mm].

When the rated power exceeds 50 [W] and is 150 [W] or less (group H), since the voltage that can be applied to the cap pin exceeds 300 [V], φA is set to approximately 15.6 [mm]. Yes. This is because the group H fluorescent lamps may be dimmed and a voltage exceeding 300 [V] may be applied when the illuminance is lowered.
The meaning of “substantially” in about 12 [mm] and about 15.6 [mm] is as follows. In the case of the group L, the design value (nominal value) of φA is 12 [mm]. However, since the base body 44 is actually a resin molded product, it varies within a range of ± 0.3 [mm]. “Abbreviation” takes this variation into consideration. Therefore, when φA is approximately 12 [mm], it indicates a range of 11.7 [mm] or more and 12.3 [mm] or less.

Similarly, when φA is approximately 15.6 [mm], it indicates a range of 15.3 [mm] or more and 15.9 [mm] or less.
(About φB1)
φB1 is determined according to the outer diameter of the glass tube. That is, the size is obtained by adding the fitting allowance of the large-diameter cylindrical portion 48 to the outer diameter of the glass tube 12. The size is determined so that the glass tube 12 can be smoothly inserted into the large-diameter cylindrical portion 48 and the silicone resin can be filled into the gap in an appropriate amount in consideration of the variation in the outer diameter of the glass tube 12.

Therefore, φB1 has a different value for each outer diameter of the glass tube.
(About φB2)
φB2 is set slightly larger than φB1. This is because the arc tube 4 is manufactured by winding the glass tube in a spiral shape, so that variations occur in the opening of the glass tube end in the direction of arrow C in FIG. Therefore, it is set larger than the outer diameter of the glass tube 12 in consideration of the variation.

  Note that the values of φB1 and φB2 shown in FIG. 11 are also design values (nominal values). Actually, since the base body 44 is a resin molded product, it varies within a range of ± 0.5 [mm]. For example, φB1 of the group L1 is actually approximately 13.6 [mm], and in this case, indicates that the range is from 13.1 [mm] to 14.1 [mm]. The same applies to other values of φB1 and φB2.

As explained above, when following the base of a straight tube fluorescent lamp, four types of plug-in sockets (FIG. 8) are prepared for each of the groups L1, L2, H1, H2 divided by the outer diameter of the glass tube. However, according to this embodiment, two types of sockets for the group L and the group H are sufficient.
Therefore, according to the fluorescent lamp 2 according to the present embodiment, the cost can be reduced by sharing the socket.

As described above, the present invention has been described based on the embodiment. However, the present invention is not limited to the above-described form, and for example, the following form may be adopted.
(1) In the above embodiment, the first base 6 and the second base 8 are connected by the connecting plate 42, but the present invention is not limited to this, and the connecting plate 42 is eliminated and the base alone is used as both ends of the arc tube 4. It may be attached to the part.
(2) In the above embodiment, the present invention has been described using an example in which the present invention is applied to a fluorescent lamp. However, the present invention is not limited to a fluorescent lamp and can also be applied to an ultraviolet lamp. That is, the phosphor film may be removed from the configuration of the fluorescent lamp according to the above-described embodiment (the phosphor film is not formed) and applied to an ultraviolet lamp. The ultraviolet lamp irradiates an irradiated object with ultraviolet rays and is used for sterilization of the irradiated object.

  The discharge lamp according to the present invention can be suitably used for, for example, a double spiral fluorescent lamp.

2 Double spiral fluorescent lamp 4 Luminescent tube 6 First cap 8 Second cap 12 Glass tube 28 First electrode 30 Second electrode 44 Base body 46 Small diameter cylindrical portion 48 Large diameter cylindrical portion 50, 52 Cap pin

Claims (5)

Inside the both ends of the glass tube in which both ends are hermetically sealed, each of the glass tube portions extending from the center in the axial direction of the tube to the ends of both tubes are spirally formed in the same plane. An arc tube in which an electrode is provided;
A base attached to each of both ends of the glass tube;
A discharge lamp comprising:
The base is
A base body that has a bottomed cylindrical shape composed of a cylindrical part and a bottom part, and is fitted to an end of the glass tube;
A pair of base pins erected outward from the bottom of the base body;
Have
The cylindrical portion has a two-stage cylindrical shape composed of a small-diameter cylindrical portion near the cap pin and a large-diameter cylindrical portion connected thereto,
The discharge lamp according to claim 1, wherein an inner diameter of a portion near the opening end of the large-diameter cylindrical portion is a size obtained by adding a fitting allowance to an outer diameter of the glass tube. The rated power of the discharge lamp is more than 7 [W] and 25 [W] or less,
The outer diameter of the small-diameter cylindrical portion is approximately 12 [mm],
2. The discharge lamp according to claim 1, wherein the inner diameter in a direction orthogonal to the plane is approximately 11.6 [mm]. The rated power of the discharge lamp is more than 25 [W] and not more than 50 [W],
The outer diameter of the small-diameter cylindrical portion is approximately 12 [mm],
2. The discharge lamp according to claim 1, wherein the inner diameter in a direction orthogonal to the plane is approximately 14 [mm]. The rated power of the discharge lamp is more than 50 [W] and not more than 100 [W],
The outer diameter of the small diameter cylindrical portion is approximately 15.6 [mm],
The discharge lamp according to claim 1, wherein the inner diameter in a direction orthogonal to the plane is approximately 23 [mm]. The rated power of the discharge lamp is more than 100 [W] and not more than 150 [W],
The outer diameter of the small diameter cylindrical portion is approximately 15.6 [mm],
The discharge lamp according to claim 1, wherein the inner diameter in a direction orthogonal to the plane is approximately 28.5 [mm].

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