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Method for making fluorescent lamp

A manufacturing method and technology of fluorescent lamps, applied in the manufacture of discharge tubes/lamps, tubes/lamp screens, cold cathodes, etc., can solve problems such as reduced lamp brightness, prevent deviation, prevent uneven coating, and reduce drying the effect of time

Inactive Publication Date: 2005-10-05
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

like Figure 9 As shown, if the uneven coating causes the thickness of the fluorescent film to increase or decrease compared with the design value, the brightness of the lamp will definitely decrease.

Method used

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  • Method for making fluorescent lamp
  • Method for making fluorescent lamp
  • Method for making fluorescent lamp

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0043] An example of the method for manufacturing a fluorescent lamp of the present invention includes a step of coating a fluorescent substance coating liquid on the inner peripheral surface of a straight glass tube in a hanging position, blowing gas into the inside from the upper end of the glass tube, and causing the above-mentioned A process in which the phosphor coating liquid is dried while being discharged. In addition, taking the position 550 mm from the upper end of the above-mentioned glass tube or the center point between the upper end and the lower end of the above-mentioned glass tube as a reference point, the ambient temperature of at least a part of the glass tube located above the above-mentioned reference point is maintained at a temperature exceeding 35 degrees Celsius The temperature is preferably maintained at 40 to 45 degrees Celsius to carry out the above-mentioned drying. And, the ambient temperature of the glass tube positioned at the lower part of the ...

Embodiment approach 2

[0057] Another example of the method for producing a fluorescent lamp of the present invention includes: a step of applying a phosphor coating liquid on the inner peripheral surface of a straight glass tube in a hanging position; blowing gas into the inside from the upper end of the glass tube to The above-mentioned phosphor coating liquid is dried while being discharged. In addition, the above-mentioned drying step is performed by locally heating the above-mentioned glass tube and moving the heated part from the upper end to the lower end of the above-mentioned glass tube. In this way, since the undried part of the phosphor coating liquid is not exposed to high temperature for a long time, the above-mentioned local drying at the lower part of the glass tube can be prevented. Furthermore, drying time can be shortened by locally heating the above-mentioned glass tube.

[0058] Moreover, the flow rate of the above-mentioned gas must be within: 16 to 80 cm per unit cross-section...

Embodiment approach 3

[0079] Another example of the method of manufacturing the fluorescent lamp of the present invention is obtained by combining Embodiment 1 and Embodiment 2. In other words, this embodiment includes the step of coating the phosphor coating liquid on the inner peripheral surface of a straight glass tube in a vertical position, blowing gas into the inside from the upper end of the glass tube, and coating the phosphor The process of drying the coating liquid while discharging it. In addition, taking the position 550 mm from the upper end of the above-mentioned glass tube or the center point between the upper end and the lower end of the glass tube as a reference point, maintaining at least a part of the surrounding temperature of the glass tube above the above-mentioned reference point at a temperature exceeding 35 degrees Celsius, Preferably, the temperature is maintained at 40 to 45 degrees Celsius to carry out the above-mentioned drying. Moreover, the surrounding temperature of...

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Abstract

The present invention provides a manufacturing method for a fluorescent lamp capable of reducing a drying time for a phosphor coating liquid and preventing its uneven application. This manufacturing method for a fluorescent lamp includes a process for applying the phosphor coating liquid to the inner circumferential face of a straight glass tube in a suspended attitude and a process for blowing drying air from the upper end of the glass tube to the inside for drying the phosphor coating liquid while discharging it. Drying is carried out while a peripheral temperature in at least a part of the glass tube positioned above a reference point is maintained at degree C or higher, and a peripheral temperature of the glass tube positioned below the reference point is maintained at 35 degree C or belw. A flow rate of the drying air ranges 16-80 cm<3> / min / mm<2>per a unit cross-sectional area of a cross section vertical to the center axis of the glass tube.

Description

technical field [0001] The present invention relates to a method for manufacturing a fluorescent lamp in which a fluorescent substance is coated on the inner peripheral surface of a straight glass tube. Background technique [0002] As a fluorescent lamp, there is a device in which a fluorescent substance is coated on the inner peripheral surface of a glass tube. For example, there are straight fluorescent lamps, or ring-shaped fluorescent lamps formed by applying a fluorescent material and then bending into a circle. [0003] The coating method of the phosphor is known as follows: from the upper end of the glass tube in the hanging position, the phosphor coating liquid containing the predetermined phosphor is poured in, or the phosphor coating liquid is sucked from the lower end of the glass tube in the same hanging position. method (for example, refer to Patent Document 1). [0004] On the other hand, cold cathode fluorescent lamps are also used as backlight sources for ...

Claims

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Application Information

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IPC IPC(8): H01J9/22
CPCH01J9/22H01J9/247H01J9/38H01J61/523H01J2209/387
Inventor 松尾和寻川崎充晴桥本望板垣克己荒田拓之
Owner PANASONIC CORP
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