JP2008251423A - Phosphor film forming method of glass bulb in fluorescent lamp - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable to finish a cleaning process in a shorter time. <P>SOLUTION: In a phosphor film forming method of a glass bulb 1 of a fluorescent lamp finished through an application process of applying coating liquid 2 containing phosphor particles on an inner face of the glass bulb 1, a drying process of drying the coating liquid 2 applied on the inner face of the glass bulb 1 after the application process to make a dried film 3, and a cleaning process of immersing an unnecessary dried film part 4 attached to an end part of the glass bulb 1 after the drying process into cleaning liquid 7 stored in a cleaning tub 6 of an ultrasonic cleaning machine 5, and peeling the same through ultrasonic vibration, a reflecting means 10 for reflecting the ultrasonic vibration propagating the cleaning liquid 7 in the cleaning tub 6 is provided inside the cleaning tub 6 of the ultrasonic cleaning machine 5, and cleaning process is carried out as the ultrasonic vibration propagating in the cleaning liquid 7 of the cleaning tub 6 is reflected toward the unnecessary dried film part 4 at the end part of the glass bulb 1 through the reflecting means 10. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method for forming a fluorescent film on a glass bulb in a fluorescent lamp used for a light source of a liquid crystal display device, for example.

Conventionally, a fluorescent lamp used as a light source for a liquid crystal television or other liquid crystal display device has a coating process in which a coating liquid containing phosphor particles is applied to a glass bulb, and a coating liquid that adheres to the glass bulb after the coating process is dried. The drying process to make a dry film, and the unnecessary dry film part (external dry film) adhering to the end of the glass bulb after the drying process is immersed in the cleaning liquid stored in the cleaning tank of the ultrasonic cleaner After the cleaning process to peel off, the dried film is baked at a high temperature and fixed as a fluorescent film on the glass bulb, and the electrode bulb, a mixed gas consisting of mercury and a rare gas is enclosed in the glass bulb. (For example, refer to Patent Document 1).
JP 2006-210124 A

  In recent years, various types of fluorescent lamps have been required according to various demands, and fluorescent lamps having a large diameter have been used. When a fluorescent film is formed on a glass bulb for a large-diameter fluorescent lamp, an unnecessary dry film portion adhering to the end of the glass bulb increases after the coating process and the drying process, and this is washed. It takes a long time to complete the cleaning process.

  This invention is made | formed in view of said situation, and makes it a subject to provide the fluorescent film formation method of the glass bulb in the fluorescent lamp which can complete | finish the washing | cleaning process of a glass bulb in a short time.

  The present invention solves the above-described problem, and includes a drying process for drying the coating liquid applied to the inner surface of the glass bulb, and an unnecessary dry film portion adhering to the end of the glass bulb after the drying process. In a method for forming a fluorescent film on a glass bulb in a fluorescent lamp, which is immersed in a cleaning liquid contained in a cleaning tank of an ultrasonic cleaning machine and separated by ultrasonic vibration, the cleaning tank of the ultrasonic cleaning machine Inside, a reflection means for reflecting the ultrasonic vibration propagating in the cleaning liquid in the cleaning tank is provided, and in the cleaning step, the ultrasonic vibration propagating in the cleaning liquid in the cleaning tank is transmitted through the reflection means to the glass bulb. It is characterized by being performed while reflecting toward an unnecessary dry film portion at the end of the film.

  According to such a configuration, the reflection tank is provided in the cleaning tank of the ultrasonic cleaning machine, and the ultrasonic vibration propagating in the cleaning liquid is reflected by the reflection means, so that an unnecessary dry film portion formed on the glass bulb is reflected. Among these, it becomes easy to peel by applying ultrasonic vibration to a portion that is difficult to peel. Thereby, since an unnecessary dry film part can be efficiently peeled, the cleaning process can be performed in a short time.

  Further, the fluorescent film forming method of the glass bulb in the fluorescent lamp according to the present invention is configured such that the reflecting means is movable in a cleaning tank, and the cleaning step is a drying process that does not require ultrasonic vibration while moving the reflecting means. You may make it reflect toward a film | membrane part.

  According to such a configuration, by configuring the reflecting means to be movable, among the unnecessary dry film portions formed on the glass bulb, the ultrasonic vibration that propagates in the cleaning liquid to the portions that are difficult to peel or the portions that are desired to be peeled off. This makes it possible to perform the cleaning process more efficiently.

  According to the method for forming a fluorescent film on a glass bulb in the fluorescent lamp according to the present invention, the glass bulb cleaning process can be completed in a short time.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  A fluorescent lamp used in a backlight device of a liquid crystal display device has a fluorescent film containing phosphor particles formed on the inner surface of a glass bulb 1 shown in FIGS. A mixed gas composed of a rare gas is enclosed, and electrodes are provided inside both ends of the glass bulb 1.

  In this fluorescent lamp, a coating liquid 2 containing phosphor particles is applied to the inner surface of the glass bulb 1, and the coating liquid 2 applied to the inner surface of the glass bulb 1 is dried to form a dry film 3. A drying process, and a cleaning process in which an unnecessary dry film portion 4 adhering to the end of the glass bulb 1 after the drying process is immersed in a cleaning liquid 7 contained in a cleaning tank 6 of an ultrasonic cleaning machine 5 and peeled off. Then, the dried film 3 is baked to be fixed as a fluorescent film, and thereafter, an electrode to which a lead wire is connected or a mixed gas is sealed in the glass bulb 1.

  As shown in FIG. 1, the coating step of applying the coating liquid 2 to the glass bulb 1 is prepared with a liquid tank 8 containing the coating liquid 2, and with one end of the glass bulb 1 standing up and down. The part is immersed in the coating liquid 2 of the liquid tank 8. Then, a vacuum pump or the like is connected to the other end of the glass bulb 1 that is not immersed in the coating solution 2, and the coating solution 2 is sucked up from one end of the glass bulb 1. When the coating liquid 2 reaches a predetermined height, the suction is stopped and the coating liquid 2 is returned to the liquid tank 8. At this time, a predetermined amount of the coating liquid 2 is attached to the inner surface of the glass bulb 1, whereby the coating liquid 2 is applied to the inner surface of the glass bulb 1.

  In the drying step, dry hot air is passed through the glass bulb 1 and heated by a heater provided on the outer periphery of the glass bulb 1 to dry the coating solution 2 applied to the inner surface of the glass bulb 1. Let

  As shown in FIG. 2, in the glass bulb 1 that has undergone the drying process, a predetermined dry film 3 is formed on the inner surface of the coating liquid 2 by drying. The dry film 3 is in a state of protruding from the end of the glass bulb 1. Specifically, the dry film 3 is attached to the end surface of the glass bulb 1 and the outer peripheral surface of the end portion of the glass bulb 1. As described above, the dry film portion 4 protruding from the end of the glass bulb 1 has an unpleasant appearance and is an unnecessary portion to be removed because it is an obstacle when an electrode or the like is provided in the glass bulb 1. . This unnecessary dry film portion 4 is removed from the glass bulb 1 by the next cleaning step.

  In the cleaning process, an ultrasonic cleaning machine 5 shown in FIG. 3 is used. The ultrasonic cleaning machine 5 includes a cleaning tank 6 that stores a cleaning liquid 7 and a vibrator 9 (oscillator) that emits predetermined ultrasonic vibrations. As shown in FIG. 3, the vibrator 9 is fixed to the outer surface of the bottom of the cleaning tank 6. As the cleaning liquid 7, water or other liquid is used.

  As shown in FIGS. 3 and 4, in the cleaning tank 6, reflecting means 10 for reflecting ultrasonic vibrations propagating through the cleaning liquid 7 is provided. For the reflecting means 10, for example, a flat plate member 11 is used. The reflecting means 10 can move in the cleaning tank 6. In other words, the reflecting means 10 is supported by supporting means provided inside or outside the cleaning tank 6, and the supporting means moves the reflecting means 10 vertically and horizontally as shown in FIG. 4 (a). The reflecting means 10 can be rotated (swinged) around its support shaft as shown in FIG.

  In the cleaning step, as shown in FIG. 3, an unnecessary dry film portion 4 at the end of the glass bulb 1 that has undergone the drying step is immersed in a cleaning solution 7 that is accommodated in a cleaning tank 6. Then, ultrasonic vibration is generated by the vibrator 9 and propagated in the cleaning liquid 7. As shown in FIG. 5, the ultrasonic vibration generated by the vibrator 9 is changed in the frequency range of several kHz to several MHz and propagates through the cleaning liquid 7. In FIG. 5, the horizontal axis represents the elapsed time (t) during the cleaning process, and the vertical axis represents the frequency (f) of ultrasonic vibration propagating through the cleaning liquid 7, and the change in ultrasonic vibration over time. Is shown.

  In this cleaning process, the position of the reflecting means 10 and the inclination angle are adjusted, and the ultrasonic vibration propagating away from the end of the glass bulb 1 immersed in the cleaning liquid 7 is reflected and refracted by the reflecting means 10. Then, it is made to touch the unnecessary dry film portion 4 adhering to the glass bulb 1. The glass bulb 1 is preferably washed in the washing step while rotating the glass bulb 1 around its axis at a predetermined rotational speed or moving it up and down with a predetermined amplitude. Further, the cleaning process of the glass bulb 1 may be performed while the reflecting means 10 is moved by the supporting means of the reflecting means 10.

  In this cleaning step, air is sent from the other end of the glass bulb 1, and this air is blown into the cleaning liquid 7 as bubbles from one end of the glass bulb 1 immersed in the cleaning liquid 7. Thus, by sending air into the glass bulb 1, the cleaning liquid 7 does not hit the required dry film 3 formed on the inner surface of the glass bulb 1.

  According to the fluorescent film forming method of the glass bulb 1 in the fluorescent lamp described above, the ultrasonic vibration propagating away from the glass bulb 1 in the cleaning liquid 7 is reflected by the reflecting means 10 in the washing step and attached to the glass bulb 1. The unnecessary dry film portion 4 can be efficiently and reliably peeled off by being applied to the unnecessary dry film portion 4. That is, the unnecessary dry film portion 4 formed on the outer peripheral surface side of the end portion of the glass bulb 1 is difficult to transmit the ultrasonic vibration transmitted from the bottom of the cleaning tank 6 and is difficult to peel off. By reflecting the ultrasonic vibration by the reflecting means 10 and applying it to the unnecessary dry film portion 4, the unnecessary dry film portion 4 can be easily peeled off in a short time. Thereby, the cleaning process of the glass bulb 1 can be performed in a short time. Further, by configuring the reflecting means 10 to be movable, the ultrasonic wave that propagates in the cleaning liquid 7 to an unnecessary dry film portion 4 formed on the glass bulb 1 that is difficult to peel off or to be peeled off quickly. It becomes easy to apply vibration, and thereby the glass bulb 1 can be cleaned more efficiently.

  6 and 7 show another example of the reflecting means 10 used in the glass bulb 1 cleaning process. In the ultrasonic cleaning machine 5 shown in FIG. 3, the flat plate member 11 is used as the reflecting means 10, but in the example of FIG. 6, the cylindrical member 12 is used as the reflecting means 10. As shown in FIG. 7, the tubular member 12 used as the reflecting means 10 has a straight portion 13 and a tapered portion 14. A through hole 15 penetrating inward and outward is formed in the straight portion 13 of the cylindrical member 12. The tapered portion 14 of the tubular member 12 is formed so as to gradually increase in diameter from the middle portion of the tubular member 12 toward the end opposite to the straight portion 13. The inner diameters of the straight portion 13 and the taper portion 14 of the cylindrical member 12 are larger than the outer diameter of the glass bulb 1, and the glass bulb 1 can be inserted through the cylindrical member 12.

  In the cleaning process using the reflecting means 10, as shown in FIG. 6, the glass bulb 1 is inserted into the cylindrical member 12 that is the reflecting means 10 and an unnecessary dry film portion 4 formed at the end of the glass bulb 1. Is immersed in the cleaning liquid 7. And the taper part 14 of the cylindrical member 12 which is the reflection means 10 is immersed in the washing | cleaning liquid 7, and an ultrasonic vibration is reflected in the inner surface of this taper part 14, and it is made to hit the unnecessary dry film part 4. FIG. At this time, the cylindrical member 12 may be moved up and down, and the vertical position of the cylindrical member 12 may be adjusted. Moreover, you may make it wash | clean while moving this cylindrical member 12 up and down. When the cylindrical member 12 is used as the reflecting means 10 as in this example, the glass bulb 1 does not have to be rotated around its axis. Further, also in the cleaning process of the glass bulb 1 by the reflecting means 10, air is sent into the glass bulb 1 during the cleaning, and air becomes bubbles from one end of the glass bulb 1 immersed in the cleaning liquid 7. This air is discharged, but this air is discharged from the through hole 15 formed in the straight portion 13 of the cylindrical member 12 to the outside of the cylindrical member 12.

  FIG. 8 shows another example of the ultrasonic cleaning machine 5 used in the glass bulb 1 cleaning process. In the ultrasonic cleaning machine 5 shown in FIG. 8, the inner surface 16 of the cleaning tank 6 is an inclined surface inclined at a predetermined angle, and the inner surface 16 reflects reflection of ultrasonic vibration propagating in the cleaning liquid 7. Means 10 are provided.

  FIGS. 9A and 9B show a modification of the reflecting means 10. As shown in FIG. 9A, the reflecting means 10 has a plate member 17 having an arc shape when viewed from the side which is curved with a predetermined radius of curvature, and a plurality of step portions as shown in FIG. 9B. A stepped plate member 18 may be used.

  The method for forming a fluorescent film on a glass bulb in a fluorescent lamp according to the present invention can finish the cleaning process in a short time, and is useful, for example, in manufacturing a fluorescent lamp that serves as a light source for a display device such as a liquid crystal television.

Sectional view showing the glass bulb in the coating process Sectional view showing the glass bulb after the drying process Sectional view showing the glass bulb in the cleaning process Side view of reflection means Diagram showing frequency range of ultrasonic vibration of ultrasonic cleaner Sectional drawing which shows the other example of a reflection means Perspective view of reflection means Sectional drawing which shows the other example of a reflection means Side view showing another example of reflecting means

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Glass valve 2 Coating liquid 3 Dry film 4 Unnecessary dry film part 5 Ultrasonic cleaner 6 Cleaning tank 7 Cleaning liquid 8 Liquid tank 9 Vibrator 10 Reflecting means 11 Flat plate member 12 Cylindrical member 13 Straight part 14 Taper part DESCRIPTION OF SYMBOLS 15 Through-hole 16 Inner side surface 17 Arc-shaped board member 18 Stair-like board member

Claims (2)

An application process for applying a coating liquid containing phosphor particles to the inner surface of the glass bulb, a drying process for drying the coating liquid applied to the inner surface of the glass bulb after the application process to form a dry film, and a glass bulb after the drying process. A glass bulb in a fluorescent lamp is subjected to a cleaning process in which an unnecessary dry film portion adhering to the end is immersed in a cleaning liquid stored in a cleaning tank of an ultrasonic cleaning machine and is peeled off by ultrasonic vibration. In the fluorescent film forming method,
In the cleaning tank of the ultrasonic cleaner, there is provided a reflecting means for reflecting the ultrasonic vibration propagating in the cleaning liquid in the cleaning tank. In the cleaning process, the ultrasonic vibration propagating in the cleaning liquid in the cleaning tank is provided. A method for forming a fluorescent film on a glass bulb in a fluorescent lamp, wherein the method is carried out while reflecting the light toward an unnecessary dry film portion at the end of the glass bulb through a reflecting means. The reflection means is configured to be movable in a cleaning tank, and the cleaning step reflects ultrasonic vibration toward an unnecessary dry film portion while moving the reflection means. A method for forming a fluorescent film on a glass bulb in the described fluorescent lamp.

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