JP2011228022A - Lamp with base - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lamp with a base capable of being connected easily with high reliability for connecting a discharge lamp and the base.SOLUTION: In this lamp with a base, a base 5 is mounted to an end of a discharge lamp 1, to which an outer lead wire 43 is introduced from a glass bulb 2. The base 5 is provided with a connection part 53 arranged to cover an outer periphery of the outer lead wire 43. The outer lead wire 43 and the connection part 53 are clamped, and a flat part 432 is formed to the outer lead wire 43 on the end nearer the lamp than the clamping part 54 as an engaging part capable of restraining a movement of the connection part 53 in a pipe axial direction.

Description

  The present invention relates to a lamp with a base used for a backlight of a liquid crystal television or a personal computer.

  Since a display device such as a liquid crystal television does not emit liquid crystal itself, a backlight is disposed behind the liquid crystal panel. Inside the backlight, a discharge lamp such as a cold cathode fluorescent lamp is disposed as a light source. In order to facilitate the assembly of the discharge lamp to the backlight, as in Patent Documents 1 to 3, a metal base is attached to the end of the discharge lamp and the base connected to the lead wire of the discharge lamp. Lamps with lamps are becoming mainstream.

International Publication No. 2008/001562 Pamphlet JP 2009-152103 A JP 2009-94064 A

  Various methods, such as caulking, soldering, laser welding, and resistance welding, have been proposed for connecting a lead wire and a base of a discharge lamp as disclosed in Patent Documents 1 to 3. However, it is not enough to connect by caulking alone, and there is a risk that the connection may be canceled due to vibrations during transportation, incorporation into the backlight, or during use. Also, soldering, laser welding, resistance welding, etc. This is not desirable because it requires a separate member or a separate device, which increases costs and increases processes.

  The objective of this invention is providing the lamp | ramp with a nozzle | cap | die with high reliability of the connection of a discharge lamp and a nozzle | cap | die, and being able to perform a connection easily.

  In order to achieve the above object, a lamp with a cap according to the present invention is a lamp with a cap formed by attaching a cap to an end of a discharge lamp from which a lead wire is led out from a bulb, and the cap includes the lead wire. The lead wire and the connection portion are crimped together, and the lead wire closer to the lamp end than the crimping portion is connected to the tube of the connection portion. A locking portion capable of suppressing the movement in the axial direction is formed.

  According to the present invention, the connection between the discharge lamp and the base is highly reliable and the connection can be easily performed.

The figure for demonstrating the lamp | ramp with a nozzle | cap | die of the 1st Embodiment of this invention. The enlarged view for demonstrating a lamp | ramp with a nozzle | cap | die. The figure for demonstrating one manufacturing method of a lamp | ramp with a nozzle | cap | die The figure for demonstrating the 1st modification regarding 1st Embodiment. The figure for demonstrating the 2nd modification regarding 1st Embodiment. The figure for demonstrating the 3rd modification regarding 1st Embodiment. The figure for demonstrating the lamp | ramp with a nozzle | cap | die of the 2nd Embodiment of this invention. The figure for demonstrating the 1st modification regarding 2nd Embodiment. The figure for demonstrating the 2nd modification regarding 2nd Embodiment. The figure for demonstrating the other example of this invention.

(First embodiment)
Below, the lamp | ramp with a nozzle | cap | die of embodiment of this invention is demonstrated with reference to drawings. FIG. 1 is a diagram for explaining a lamp with a cap according to a first embodiment of the present invention. In the following, for convenience, a lamp with a cap as shown in FIG. 1 is divided into a lamp end, a lamp center, and a lamp end along the tube axis from the end, and when viewed from a certain point, the lamp is outside the lamp. The term “end side” or “center side of the lamp” will be referred to as “lamp center side”.

  The lamp with a cap shown in FIG. 1 includes a discharge lamp 1 as a basic configuration. The discharge lamp 1 is a cold cathode fluorescent lamp having a total length of about 1000 mm and an outer diameter of 2.0 to 6.0 mm, and includes a glass bulb 2 as a discharge vessel.

  The glass bulb 2 is a long and narrow tube made of, for example, hard glass or soft glass sealed at both ends, and a discharge medium made of mercury and a rare gas is sealed in the internal space. As the rare gas, neon, argon, xenon, krypton, or the like can be used. In this embodiment, a mixed gas of neon and argon is used. On the inner surface of the glass bulb 2, a phosphor layer 3 made of RGB three-wavelength phosphor is formed at least in a range covering the light emission region of the lamp.

  Electrode mounts 4 are sealed at both ends of the glass bulb 2. The electrode mount 4 includes an inner lead wire 41, an electrode 42, an outer lead wire 43 and a bead 44.

  The inner lead wire 41 is sealed to the end of the glass bulb 2, and one end is led out to the internal space and the other end is led to the outer space so as to be along the tube axis. As the inner lead wire 41, it is desirable to use a material having a thermal expansion coefficient close to that of the glass bulb 2, such as molybdenum, kovar (alloy made of nickel, iron, cobalt), iron-nickel alloy or the like.

  The electrode 42 is a metal cup having a bottomed opening with a total length of 5 to 30 mm. The bottom side of the electrode 42 is connected to the inner lead wire 41 by welding or the like, and is disposed so as to face the other electrode 42. Yes. As the electrode 42, it is desirable to use a material excellent in sputtering resistance, such as nickel, molybdenum, and tungsten.

  One end of the outer lead wire 43 is connected to the inner lead wire 41, and the other end extends in the external space direction along the tube axis. As the outer lead wire 43, it is desirable to use a material having excellent electrical conductivity and workability such as dumet.

  The beads 44 are formed on the shaft member of the inner lead wire 41 and are hermetically sealed at both ends of the glass bulb 2. It is desirable to use a material close to the thermal expansion coefficient of the glass bulb 2 as the bead 44.

  A cap 5 made of, for example, a copper alloy or an iron alloy is attached to both ends of the glass bulb 2. The base 5 includes a base portion 51, a connecting portion 52, and a connecting portion 53.

  The base part 51 is a base part of the base 5 held by the lamp holder of the backlight, and is constituted by a substantially cylindrical tube formed by rolling a metal plate. A pair of protrusions 511 and slits 512 are formed on the side surface portion. The protruding portion 511 is a hemispherical protrusion that is formed by punching and protrudes in the direction of the internal space of the base 5. It is. When the glass bulb 2 having a diameter smaller than the inner diameter of the base portion 51 and larger than the distance between the two protruding portions 511 is inserted into the base 5 by the protruding portions 511 and the slits 512, the metal between the slits 512 is inserted. The part becomes elastically deformed. Thereby, the base 5 can be easily attached to the end of the glass bulb 2.

  The connecting portion 52 is a portion that connects the base portion 51 and the connecting portion 53, and is composed of a metal piece led out in the lamp end direction and the lamp inner diameter direction. Its thickness and width are small, and even when a relatively weak force is applied, it is elastically deformed in the inner diameter direction, so even if there is variation in the design of the lamp or base, this part can absorb to some extent. is there.

  The connection part 53 is a part arrange | positioned so that the outer periphery of a lead wire may be covered. In the present embodiment, the connection portion 53 includes a pair of connection pieces 531, which surround the outer peripheral surface of the outer lead wire 43, and mechanical and electrical connection between the outer lead wire 43 and the connection portion 53. Is done. Therefore, the electrode 42 in the glass bulb 2 and the base portion 51 of the base 5 are electrically connected via the inner lead wire 41, the outer lead wire 43, the connecting portion 52, and the connecting portion 53. The discharge lamp 1 can be turned on by supplying electric power to the base portion 51. Note that “so as to cover” does not mean that the entire outer periphery of the lead wire, that is, 360 ° is covered, but about 270 ° or more in order to strengthen their mechanical connection relationship. It means a state that is covered.

  A connection structure between the outer lead wire 43 and the connection portion 53 will be described in detail with reference to FIG. FIG. 2 is an enlarged view for explaining the vicinity of the end of the lamp, (a) is a side view, and (b) is a view when viewed from the lamp end side.

  The outer lead wire 43 and the connection part 53 are connected by crimping. More specifically, in the crimping portion 54, the outer lead wire 43 includes an elliptical columnar flat portion 431 as an external shape whose cross-sectional shape perpendicular to the tube axis is flat, and the flat portion The structure is such that both side surfaces of the rounded outer periphery of 431 are sandwiched by a pair of connection pieces 531 of the connection portion 53. The flat shape is a non-circular shape having a short side and a long side, for example, the thickness (mm) of the long side portion is preferably 1.1 times or more with respect to the thickness (mm) of the short side portion. Is a shape that is 1.3 times or more.

  Further, a flat portion 432 is also formed on the outer lead wire 43 closer to the lamp end than the crimped portion 54. The flat portion 432 is a flat plate as an external shape, and is arranged so that a line X-X ′ passing through the longitudinal direction thereof is orthogonal to a line Y-Y ′ passing through the longitudinal direction of the flat portion 432. In this way, when viewed from the lamp end side, the flat portion 432 is moved in the tube axis direction of the connecting portion 53 by configuring the lines passing through the longitudinal directions of the flat portion 431 and the flat portion 432 to intersect each other. It can be made to act as a latching part which can control. That is, even if the connection is released due to weak connection by crimping of the flat portion 431 and the connection portion 53 or due to excessive external impact, the connection portion 53 is not connected to the outer lead. Since it may be possible to maintain electrical conduction by preventing the wire 43 from coming off, it is possible to realize a connection with higher reliability than in the case of connection only by crimping.

  Next, a method of mounting the base will be described with reference to FIG.

  First, as shown in (a), the base 5 is inserted from the lamp end side of the discharge lamp 1 so that the outer lead wire 43 is included in the internal space of the connection portion 53 ′. This connection portion 53 ′ is the connection portion 53 in the initial state, and has a cylindrical shape with a pair of semicircular arc-shaped connection pieces 531 ′. When the base 5 is arranged at a predetermined position of the discharge lamp 1, the pair of connection pieces 531 'are pressed from both sides by the pair of molds 6 having semi-elliptical recesses as shown in FIG. By this pressing step, the pair of connection pieces 531 are deformed so as to be in close contact with the outer surface of the flat portion 431 of the outer lead wire 43, and the connection by crimping is completed.

  Next, with the pair of molds 7 having a shallow uniform recess as shown in FIG. 5C, the recess of the outer lead wire 43 on the lamp end side of the crimping portion 54 is perpendicular to the longitudinal direction of the flat portion 431. Pressing from both directions forms a plate-like flat part 432 as shown in FIG. In this way, since the discharge lamp 1 and the base 5 can be connected with high reliability only by performing the pressing process twice, the connection can be easily performed as compared with soldering, laser welding, resistance welding, and the like. Can do. The pressing process using the mold 7 may be performed simultaneously with the pressing process using the mold 6.

  Lamp with cap according to the present embodiment (Example 1), lamp with cap that is only crimped (Comparative Example 1), lamp with cap that is irradiated with laser after crimping (Comparative Example 2) A vibration test and a production test were performed on each of the ten pieces. As a result, in Example 1 and Comparative Example 2, when power was supplied to the base portion 51 after the vibration test, all the lamps were turned on as usual, but in Comparative Example 1, the caulking of the connection portion 53 and the outer lead wire 43 was released. Several lamps that did not light up due to the lack of electrical conduction were confirmed. Further, in the production test, when time and cost required for production were evaluated, Comparative Example 1 was excellent, Example 1 was good, and Comparative Example 2 was inferior. From the above, it can be determined that the structure of Example 1 is comprehensively excellent.

  Therefore, in the first embodiment, the outer lead wire 43 and the connection portion 53 are tightened so that the movement of the connection portion 53 in the tube axis direction of the outer lead wire 43 closer to the lamp end than the crimping portion 54 can be suppressed. Since the flat portion 432 is formed by press working as the stop portion, it is possible to prevent the base 5 from coming out of the discharge lamp 1 even when the crimping connection is released by vibration or the like. High connection is possible.

  Further, the outer lead wire 43 in the crimping portion 54 and the cross-sectional shape perpendicular to the tube axis of the locking portion are both flat, and when viewed from the lamp end side, the lines passing in the longitudinal direction intersect each other. As a result, even if the connection of the crimping portion 54 is released, the connection portion 53 is caught by the flat portion 432, so that it is possible to reliably prevent the base 5 from coming off the discharge lamp 1.

  Note that the first embodiment may be modified into a structure such as that shown in FIGS.

  4 shows a structure in which a ball 433 is formed on the outer lead wire 43 closer to the lamp end than the crimping portion 54. FIG. Also in this embodiment, the same effect as that of the first embodiment can be obtained. The sphere 433 may be formed in advance before the crimping step as shown in FIG. In this case, it is desirable that the diameter is larger than the length of the crimping portion 54 in the short direction and can pass through the inside of the connection portion 53 ′ in the step (a).

  FIG. 5 shows a structure in which a flat portion 434 is formed on the outer lead wire 43 closer to the lamp end than the crimping portion 54 so that the longitudinal direction is along the longitudinal direction of the flat portion 431. The flat portion 434 has a long side longer than the long side of the flat portion 431. Therefore, even if the longitudinal direction does not intersect the longitudinal direction of the flat portion 431, the tube axis of the connecting portion 53 Directional movement can be suppressed. Therefore, the same effect as the first embodiment can be obtained.

  FIG. 6 shows a structure in which a bent portion 435 is formed on the outer lead wire 43 closer to the lamp end than the crimping portion 54. The bent portion 435 is bent so that the tip end portion of the outer lead wire 43 is turned back to the center side of the lamp after the crimping process as shown in FIG. Since the bent portion 435 acts as a locking portion capable of suppressing the movement of the connecting portion 53 in the tube axis direction, the same effect as that of the modified example of the first embodiment can be obtained.

  Furthermore, in this embodiment, a flat portion 436 along the outside of one connection piece 531 is formed at the tip of the folded outer lead wire 43. The flat portion 436 is also formed by crimping the connection portion 53. With such a structure, the fixing strength of the crimping portion 54 is further increased, and the electrical contact is further stabilized, so that a more reliable connection is possible. The flat portion 436 may be formed at the same time as the outer lead wire 43 and the connecting portion 53 are crimped. That is, the pressing process of FIG. 3B may be performed after the tip portion of the outer lead wire 43 is folded and disposed outside the connection piece 531 '.

(Second Embodiment)
FIG. 7 is a diagram for explaining a lamp with a cap according to a second embodiment of the present invention. About each part of subsequent embodiment, the same part as each part of 1st Embodiment is shown with the same code | symbol, and the description is abbreviate | omitted.

  In the second embodiment, a flat portion 437 is formed on the outer lead wire 43 closer to the center of the lamp than the crimping portion 54. Thereby, the flat part 437 acts as a locking part capable of suppressing the movement of the connection part 53 on the lamp center side. Therefore, it is possible to prevent the connecting portion 53 from shifting to the lamp end side and the lamp center side, and thus it is possible to prevent the energization of the connecting portion 53 and the outer lead wire 43 from becoming unstable. It is desirable that both the flat part 431 and the flat part 437 are in contact with the connection part 53. Thereby, even if the connection of the crimping part 54 is cancelled | released, it can prevent that the electrical connection of the outer lead wire 43 and the connection part 53 is cancelled | released. The structure as described above may be performed in a portion slightly on the lamp end side (lamp center side) from the crimped portion 54 in the pressing process of the flat portion 432 (flat portion 437).

  Note that the second embodiment may be modified to have a structure as shown in FIGS.

  In FIG. 8, the bent portion 435 and the bent portion 438 sandwich the caulking portion 54 in the tube axis direction. That is, after the outer lead wire 43 is bent by approximately 180 ° toward the lamp center side, and then bent by approximately 90 ° toward the lamp inner diameter side at the lamp center side than the crimping portion 54, the bent portion 438 is connected to the connection portion 53. It acts as a locking part that can suppress movement toward the center of the lamp. Therefore, the same effect as that of the modification of the second embodiment can be obtained.

  FIG. 9 shows a structure in which the end of the glass bulb 2 is brought into contact with the lamp center side of the connecting portion 52. Even in this structure, the end portion of the glass bulb 2 can act as a locking portion capable of suppressing the movement of the connecting portion 53 on the lamp center side. Therefore, the same effect as that of the modified example of the second embodiment can be obtained without forming a locking portion on the outer lead wire 43 or the like.

  While various embodiments have been described above, the present invention is not limited to these. For example, the holding structure of the glass bulb 1 by the base 5 is not limited to that by the protrusion 511 and the slit 512, but is by two or more holding pieces cut out from the base portion such as WO2008 / 1565 in the lamp inner diameter direction. There may be. The base 5 is not limited to one formed from a metal plate, and may be formed by closely winding a metal wire in a spiral manner as shown in FIG.

  Further, the lead wire is not limited to two parts as in the present embodiment, and may be composed of one part or three parts. Further, the inner lead wire 41 and the electrode 42 need not be separate parts, and may be formed integrally.

DESCRIPTION OF SYMBOLS 1 Discharge lamp 2 Glass bulb 4 Electrode mount 42 Electrode 43 Outer lead wire 431, 432 Flat part 5 Base 51 Base part 52 Connection part 53 Connection part 531 Connection piece 54 Clamping part

Claims (4)

A lamp with a cap formed by attaching a cap to an end of a discharge lamp from which a lead wire is led out from a bulb,
The base includes a connection portion arranged to cover the outer periphery of the lead wire,
The lead wire and the connecting portion are crimped, and a locking portion capable of suppressing movement of the connecting portion in the tube axis direction is formed on the lead wire closer to the lamp end than the crimped portion. A lamp with a cap, characterized by   The lead wire and the locking portion in the crimping portion are both flat in cross section perpendicular to the tube axis, and when viewed from the lamp end side, the lines passing in the longitudinal direction intersect each other. The lamp with a cap according to claim 1, wherein the lamp has a cap.   The lamp with cap according to claim 1, wherein the locking portion is a bent portion formed on the lead wire on the lamp end side with respect to the crimping portion.   A locking portion capable of suppressing movement of the connecting portion in the tube axis direction is formed closer to the center side of the lamp than the crimped portion of the lead wire of the lead wire, and the connecting portion includes both the locking portions. The lamp with a cap according to any one of claims 1 to 3, wherein the lamp is in contact with the portion.

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