JP2005327594A - Manufacturing device and manufacturing method of cold-cathode fluorescent lamp - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrode-fixing bulb shaping device for stably shaping and forming a constriction on a bead of a mount inserted into a bulb tube body at an appropriate position and in an appropriate shape, regardless of the outside size of an electrode of a cold-cathode fluorescent lamp. <P>SOLUTION: This cold-cathode fluorescent lamp manufacturing device is characterized by comprising: a mount insertion means 13 for inserting the mount 19 comprising a second electrode 19a and a bead part 19b jointed to the electrode from the lower end of a rotating bulb chuck 10 catching a glass bulb 18 with a first electrode sealed to its one-side end rotatably around the long axis of the glass bulb 18 by disposing the electrode on the upper side thereof and from the lower end of the glass bulb 18 caught by the rotating bulb chuck 10; a heating means for softening the glass bulb at the height position of a jointing part between the second electrode and the bead part of the mount inserted into the glass bulb by the means; and a shaping means for forming a constriction on the tube wall of the glass bulb in the part heated by the means in its circumferential direction. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an apparatus for manufacturing a cold cathode fluorescent lamp, and more particularly to an apparatus for inserting and sealing a mount in a bulb tube.

  Conventionally, in the manufacturing process of a cold cathode fluorescent lamp, the steps of fixing and sealing electrodes and mounts are performed according to the procedure shown in FIG. First, as shown in FIG. 2A, a mount 72 having an electrode 72a is sealed at one end of a glass bulb 71. Next, a constriction 73 is molded on the other end of the semi-finished glass bulb 71 as shown in FIG. Further, as shown in FIG. 6C, the electrode 74 a of the mount 74 constituted by the electrode 74 a and the bead 74 b is inserted into the constriction 73, and the bead 74 b is fixed at the constriction position of the constriction 73. Thereafter, after the exhaust process, the rare gas sealing process, the first sealing process, and the mercury releasing process, the process of sealing the mount and the valve body by the second sealing device is performed. A lamp portion 75 as shown in FIG.

  The outer shape of the electrode 74 a of the lamp portion 75 manufactured in the above-described process is set to be smaller than the inner diameter of the constriction 73. Therefore, when the mount is inserted, the electrode 74 a is inserted through the constriction 73, and the bead 74 b hits the inner edge of the constriction 73 and stops at that position. Thereby, the installation position of the electrode 74a is accurately determined, and the sealing of the mount is stably performed at the portion of the bead 74b.

  Recently, however, cold cathode fluorescent lamps are required to have a product design that meets demands such as improvement in luminous efficiency or downsizing of bulbs. For this reason, the external shape of the electrode of the mount tends to be relatively enlarged as compared with itself or the valve diameter. Therefore, as shown in FIG. 8A, in the conventional mount, the outer shape of the electrode 84a is smaller than the diameter of the bead 84b, passes through the shaped constriction 83, and the bead 84b is engaged with the constriction 83. It was. However, when the outer shape of the electrode 85a becomes almost the same size as the bead diameter 85b due to the design change, the electrode 85a is caught by the inner diameter 83a of the constriction 83 as shown in FIG. For this reason, there was a problem that the mount could not reach a predetermined position, resulting in production failure.

  Further, in the mount having such an enlarged electrode, even if the constriction is formed on the valve tube body before insertion of the mount, the electrode portion 85a of the mount is fixed at the constriction 83 as shown in FIG. Or the situation where the largest outer-diameter part 85b of the bead was fixed to the constriction 83 like FIG. For this reason, there has been a problem that accurate positioning of the mount cannot be performed and stable product manufacture cannot be performed.

  The present invention has been made in view of the above-described conventional problems, and a manufacturing apparatus capable of manufacturing a stable cold cathode fluorescent lamp based on accurate positioning regardless of the outer size of an electrode to be mounted, and It aims at providing the manufacturing method.

  In order to achieve the above object, a cold-cathode fluorescent lamp manufacturing apparatus according to the present invention includes a glass bulb in which a first electrode is sealed at one end, the electrode is disposed above, and the glass bulb Mount insertion for inserting a rotary valve chuck that is rotatably held around a long axis, and a second electrode and a mount made of a bead joined to the electrode from the lower end of the glass bulb held by the rotary valve chuck Means, a heating means for softening the glass bulb at a height position of a joint portion between the second electrode of the mount and the bead portion inserted into the glass bulb by the means, and a portion heated by the means The glass bulb includes a mold forming means for forming a constriction in the circumferential direction on the tube wall of the glass bulb.

  In the cold cathode fluorescent lamp manufacturing apparatus of the present invention, the rotary valve chuck includes first and second bearing bodies, and the first bearing body includes two arms spaced apart from each other, and And a pair of rollers rotatable around a rotation axis substantially parallel to the glass bulb, and the second bearing body is also provided with two arms extending in a substantially horizontal direction. And a pair of rollers that can rotate around a rotation axis substantially parallel to the glass bulb, on the side surfaces of the end portions of these arms, and the first and second bearing bodies are the ends of the arms. The glass bulb is rotatably held by the pair of rollers provided in the section.

  Furthermore, in the cold cathode fluorescent lamp manufacturing apparatus of the present invention, the first and second bearing bodies are provided so as to be movable toward or away from the glass bulb. It is.

  Further, in the cold cathode fluorescent lamp manufacturing apparatus according to the present invention, the first and second bearing bodies are attached to a slider and move on a common substrate.

  Furthermore, in the cold cathode fluorescent lamp manufacturing apparatus of the present invention, there is provided a rotational drive means for transmitting rotational power to at least one roller of the rotational shaft of either of the first and second bearing bodies. It is characterized by being.

  Furthermore, in the cold cathode fluorescent lamp manufacturing apparatus according to the present invention, the heating means or the shaping means is movable between the two arms of the bearing body so as to approach or separate from the glass bulb. It is provided.

  Furthermore, in the cold cathode fluorescent lamp manufacturing apparatus of the present invention, the roller is provided with an impact buffering mold.

  Further, the manufacturing method of the cold cathode fluorescent lamp according to the present invention includes a step of sandwiching a glass bulb having a first electrode sealed at one end thereof so as to be rotatable around the tube axis, and the step of sandwiching the glass bulb. From the other end of the glass bulb, a step of inserting a mount composed of a second electrode and a bead portion joined to the electrode, and a joint portion between the second electrode of the mount and the bead portion inserted by this step It comprises a step of softening the glass bulb at a corresponding position in the tube axis direction, and a step of forming a constriction in the circumferential direction on the tube wall softened by this step.

  According to the present invention, regardless of the shape and size of the electrode, the constriction is formed in the circumferential direction of the glass bulb corresponding to the joint portion between the electrode portion of the inserted mount and the bead portion. Positioning can be performed accurately, and stable production of a cold cathode fluorescent lamp can be performed.

  Hereinafter, embodiments of a cold cathode fluorescent lamp manufacturing apparatus of the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view of a bulb chuck portion in the cold cathode fluorescent lamp manufacturing apparatus of the present invention. In this apparatus, a rotary valve chuck 10 that holds a glass bulb 18 rotatably around a substantially vertical tube axis, and a mount pusher 13 that holds a mount 19 enclosed in the glass bulb 18 and inserts it into the bulb. And a rotary drive device 16 that rotates the glass bulb 18 around the tube axis.

  The rotary valve chuck 10 includes first and second bearing bodies 11 and 12 that are movably attached along two parallel upper and lower guides 171 and 172 that are extended and fixed to the slider plate 17 in a substantially horizontal direction. Is provided.

  The first bearing body 11 includes two upper and lower plate-like arms 11a and 11b extending in a substantially horizontal direction, and a pair of rollers 111 and 112 provided at ends of the arms 11a and 11b. ing. The first bearing body 11 has a U-shaped side surface as a whole by two upper and lower arms 11a and 11b. The pair of rollers 111 and 112 are fixed to the tip of the upper arm 11a at a pair of rotating shafts 111a and 112a disposed substantially parallel to the tube axis of the glass bulb 18, and the rotating shafts 111a and 112a. A plurality of disks 111b and 112b are provided. The two rotating shafts 111a and 112a are disposed close to each other so that the circumferential portions of the disks 111b and 112b alternately enter and overlap each other. A V-shaped recess is formed in the overlapping portion of these disks 111b and 112b. As will be described later, a glass bulb 18 is held in this recess. The two rotary shafts 111a and 112a are fixed between the bearing plates 111c and 111c that are formed so as to protrude substantially perpendicularly to the side surface of the plate-like arm 11a at the tip of the plate-like arm 11a. .

  A pair of rollers 111 and 112 are also provided at the tip of the lower arm 11b. Since the pair of rollers 111 and 112 has almost the same configuration as the pair of rollers 111 and 112 provided at the tip of the upper arm 11a, the same components are denoted by the same reference numerals and description thereof is omitted. To do. A V-shaped recess is also formed in the overlapping portion of the disks 111b and 112b of the pair of rollers 111 and 112, and the glass bulb 18 is sandwiched between these portions as described above.

  On the other hand, like the first bearing body 11, the second bearing body 12 also has two upper and lower plate-like arms 12a and 12b extending in the substantially horizontal direction, and ends of these arms 12a and 12b. A pair of rollers 111 and 112 are provided. Similarly to the first bearing body 11, the second bearing body 12 has a U-shaped side surface as a whole by two upper and lower arms 12a and 12b.

  Since the pair of rollers 111 and 112 has substantially the same configuration as the pair of rollers 111 and 112 provided at the distal ends of the upper arm 11a and the lower arm 11b in the first bearing body 11, The same numbers are assigned and the description thereof is omitted. However, the pair of rollers 111 and 112 is provided at the tip of the upper arm 11a and the lower arm 11b of the first bearing body 11 at the tip of the upper and lower two plate-like arms 12a and 12b. Provided on the side surface facing the rollers 111 and 112. And the V-shaped recess is similarly formed in the overlap part of the disks 111b and 112b of a pair of rollers 111 and 112, and the glass bulb 18 is clamped by this part similarly to the above-mentioned. That is, when the first and second bearing bodies 11, 12 approach each other along the two guides 171, 172 fixed to the slider plate 17, these V-shaped recesses become V-shaped on the upper arm 11 a. The glass bulb 18 is located substantially in the center with the V-shaped recess of the upper arm 12a facing the V-shaped recess of the upper arm 12a and the V-shaped recess of the lower arm 11b facing the V-shaped recess of the lower arm 12b. Is sandwiched between four pairs of rollers 111 and 112.

  Next, of the two pairs of rollers 111 and 112 provided at the tip ends of the upper and lower two plate-like arms 12a and 12b of the second bearing body 12, one of the rollers 111 has a rotating shaft 111a connected to the connecting shaft. 16d. Further, a timing pulley 16a is connected to a rotation shaft 111a of the roller 111 provided on the upper arm 12a. The timing pulley 16a is coupled to a rotating shaft of a motor 16c constituting the rotation driving device 16 by a timing belt 16b. Therefore, one of the two pairs of rollers 111 and 112 provided at the tip of the upper and lower two plate-like arms 12a and 12b of the second bearing body 12 is rotationally driven by the motor 16c. That is, these rollers 111 are drive rollers, and a pair of rollers 111 and 112 provided at the tip of the other arm 112 and the upper arm 11a and the lower arm 11b in the first bearing body 11 paired with these rollers. Is a free-rolling free roller. Note that when the first and second bearing bodies 11 and 12 move closer to each other and the glass bulb 18 is pinched by the rollers 111 and 112, the disk 111b of the drive roller 111 is used to reduce the impact. Is made of SUS, and the disks 111b and 112b of the free rollers 111 and 112 are molded with urethane.

  As shown in the enlarged view of FIG. 1B, the push-up bar 13a of the mount push-up device 13 has a mount 19 including an electrode portion 19a, a bead portion 19b, and a lead wire portion 19c at the tip thereof. Is held at a predetermined position, and is placed at a position substantially below the center between the first and second bearing bodies 11 and 12 and is on standby. Further, as shown in FIG. 6, the first and second bearing bodies 11 include a burner 14 that heats and softens a predetermined portion of the glass bulb 18 and a mold roller 15 that forms a constriction in the softened glass bulb 18. , 12 are movably provided.

  In addition, an open / close air chuck drive device 173 that horizontally moves the first and second bearing bodies 11 and 12 of the rotary valve chuck 10 along the guides 171 and 172, and a mount push-up device 13 (not shown). A lifting device moving device that moves to a position immediately below the glass bulb 18, a burner moving device that places the burner 14 in the immediate vicinity of the target glass bulb 18, and a typing roller moving device that moves the molding roller 15 to a position where it presses against the target glass bulb 18. Each is provided with program control means for controlling the drive and movement thereof.

  Next, the operation of the cold cathode fluorescent lamp manufacturing apparatus configured as described above will be described with reference to the manufacturing process flowchart shown in FIG. 2 and FIGS. 3 to 6. 3 to 6, parts corresponding to the configuration shown in FIG.

  First, in step S11 shown in FIG. 2, the glass bulb 18 in the state shown in FIG. 7A, for example, with the electrode sealed at the end thereof is manufactured as shown in FIG. It is carried in. This is shown in FIG. The glass bulb 18 is conveyed by, for example, the valve conveyance chuck 31 shown in FIG. 3 and moved to the front front of the rotary valve chuck 10 to be directly above the mount 19 held by the mount push-up device 13. Stop.

  Next, as shown in FIG. 4, in step S12, the valve centering chuck 41 disposed below the rotary valve chuck 10 grips the lower portion of the glass bulb 18 that has been carried in and centers it at a predetermined mount insertion position.

  Further, in step S13, the mount push-up chuck 42 of the mount push-up device 13 moves the push-up bar 13a upward so as to enter the tube of the glass bulb 18.

  Next, in step S14, as shown in FIG. 5, the slider plate 17 to which the two bearing bodies 11 and 12 of the rotary valve chuck 10 are attached is moved in the direction of the arrow 52 by the push-out slide 51 to which the slider plate 17 is attached. Is done. Then, rollers 111 and 112 provided on the upper arms 11 a and 12 a and the lower arms 11 b and 12 b of the rotary valve chuck 10 are arranged in the vicinity of the glass bulb 18. Further, in step S15, both the bearing bodies 11 and 12 are further moved, and the four pairs of rollers 111 and 112 of the upper arms 11a and 12a are placed on the upper part of the glass bulb 18, and the four pairs of rollers 111 of the lower arms 11b and 12b are arranged. 112 sandwiches the lower part of the glass bulb 18 from four directions, and sandwiches the glass bulb 18.

  In the next step S16, the valve transport chuck 31 and the valve centering chuck 41 that have been holding the glass bulb 18 until then are opened. After this opening, in step S17, the motor 16c of the rotational drive device 16 is activated to drive the drive roller 111 to rotate. The rotation of the driving roller 111 causes the glass bulb 18 held between the four pairs of rollers 111 and 112 provided on the upper arms 11a and 12a and the lower arms 11b and 12b to be indicated by an arrow 53 around the tube axis. Rotate to.

  In step S18, the push-up rod 13a of the mount push-up device 13 moves up in the direction indicated by the arrow 54 until the mount 19 placed on the upper end reaches a predetermined position of the glass bulb 18, and stops. This predetermined position is a position where the height of the joint portion between the electrode 19a and the bead 19b of the mount 19 mounted on the push-up bar 13a is finally sealed to the glass bulb 18.

  Next, in step S19, as shown in FIG. 6, the vicinity of the predetermined position of the glass bulb 18 in which the burner 14 is rotating is heated to soften the tube wall. In step S20, the molding roller 15 advances to the softened portion of the glass bulb 18, and the peripheral edge of the rotating roller is pressed against the glass bulb 18 to form a constriction.

  When the formation of the constriction in step S20 is completed, the molding roller 15 is retracted, and the heating of the burner 14 is also completed. The process proceeds to the glass bulb 18, which is molded and holds the mount therein, the next exhaust, sealing and the like.

  As described above, according to the present embodiment, since the constriction mold is formed on the bulb tube body after inserting the mount for sealing the cold cathode fluorescent lamp, the outer size of the electrode and the outer diameter of the bead are reduced. Regardless, the constriction for mounting and sealing the mount can be formed at a predetermined position. In addition, the formed constriction enables the inserted mount to be properly positioned and sealed, so that it is possible to manufacture a product of a stable quality cold cathode fluorescent lamp.

  Further, the lamp side and the exhaust pipe side of the glass bulb 18 are supported by being sandwiched from the left and right by the first and second bearing bodies in which the upper and lower arms are integrated, so that the lamp shafts on the lamp side and the exhaust pipe side are supported. The deviation can be prevented, and there is also an effect of stably producing the cold cathode fluorescent lamp product.

The perspective view which shows the principal part structure of the cold cathode fluorescent lamp manufacturing apparatus which is embodiment of this invention. The flowchart which shows the process sequence which manufactures a cold cathode fluorescent lamp using the cold cathode fluorescent lamp manufacturing apparatus which is embodiment of this invention. The side view which shows the principal part structure of the apparatus for demonstrating operation | movement of the cold cathode fluorescent lamp manufacturing apparatus which is embodiment of this invention. The side view which shows the principal part structure of the apparatus for demonstrating operation | movement of the cold cathode fluorescent lamp manufacturing apparatus which is embodiment of this invention. The side view which shows the principal part structure of the apparatus for demonstrating operation | movement of the cold cathode fluorescent lamp manufacturing apparatus which is embodiment of this invention. The side view which shows the principal part structure of the apparatus for demonstrating operation | movement of the cold cathode fluorescent lamp manufacturing apparatus which is embodiment of this invention. Process drawing which shows the manufacturing process of the conventional cold cathode fluorescent lamp manufacturing apparatus. Process drawing which shows the manufacturing process principal part of the conventional cold cathode fluorescent lamp manufacturing apparatus. Process drawing which shows the manufacturing process principal part of the conventional cold cathode fluorescent lamp manufacturing apparatus.

Explanation of symbols

10: Rotary valve chuck,
11, 12 ... Bearing body,
11a, 11b, 12a, 12b ... arms,
13 ... push-up device,
13a ... push-up bar,
14 ... Burner,
15 ... Molding roller,
16 ... Rotation drive device,
16a ... timing pulley,
16b ... timing belt,
16c ... motor,
16d ... connecting shaft,
17 ... slider plate,
18 ... Glass bulb,
19 ... Mount,
19a ... electrode part,
19b ... beads part,
19c ... lead wire part,
31 ... Valve transfer chuck,
41 ... Valve centering chuck,
42 ... push-up chuck,
51 ... A slide-out slide,
52, 53, 54 ... direction of movement or rotation,
111, 112 ... rollers,
111a, 112b ... rotating shaft,
111b, 112b ... disk,
111c ... bearing plate,
171, 172... Slider 173... Open / close air chuck drive device.

Claims (8)

  A rotary valve chuck in which a glass bulb having a first electrode sealed at one end is disposed on the upper side of the glass bulb so as to be rotatable around the long axis of the glass bulb, and the rotary bulb chuck Mount insertion means for inserting a second electrode and a mount composed of a bead portion joined to the electrode from the lower end of the sandwiched glass bulb, and the second of the mount inserted into the glass bulb by this means Heating means for softening the glass bulb at the height position of the joining portion of the electrode and the bead portion, and a mold forming means for forming a constriction in the circumferential direction on the tube wall of the glass bulb in the portion heated by this means An apparatus for manufacturing a cold cathode fluorescent lamp. The rotary valve chuck comprises first and second bearing bodies,
The first bearing body includes two arms that are spaced apart, and a pair of rollers that are rotatable around a rotation axis that is substantially parallel to the glass bulb on an end side surface of each arm. The second bearing body includes two arms that are also extended in a substantially horizontal direction, and a pair of rollers that are rotatable around a rotation axis that is substantially parallel to the glass bulb at the ends of the arms. 2. The cooling device according to claim 1, wherein the first and second bearing bodies sandwich the glass bulb rotatably by the pair of rollers provided at end portions of the arms. Cathode fluorescent lamp manufacturing equipment.   The cold cathode fluorescent lamp manufacturing apparatus according to claim 2, wherein the first and second bearing bodies are provided so as to be movable toward or away from the glass bulb.   The cold cathode fluorescent lamp manufacturing apparatus according to claim 3, wherein the first and second bearing bodies are attached to a slider and move on a common substrate.   5. The cold cathode fluorescent lamp according to claim 4, further comprising: a rotational driving means for transmitting rotational power to at least one roller of the rotational shaft of any of the first and second bearing bodies. manufacturing device.   6. The cold cathode fluorescence according to claim 5, wherein the heating means or the shaping means is provided so as to be movable between two arms of the bearing body so as to approach or separate from the glass bulb. Lamp manufacturing equipment.   7. The cold cathode fluorescent lamp manufacturing apparatus according to claim 6, wherein the roller is provided with an impact buffering mold.   A glass bulb having a first electrode sealed at one end thereof is rotatably held around the tube axis, and the second electrode and the electrode are connected from the other end of the glass bulb held by this step. The glass bulb is softened at a position in the tube axial direction corresponding to the joint portion between the second electrode of the mount and the bead portion inserted by the step. And a step of forming a constriction in the circumferential direction on the tube wall softened by this step.

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