Process for producing double helical glass tube, light-emitting tube for fluorescent lamp, and fluorescent lamp
A manufacturing method and technology of glass tubes, which are applied in glass manufacturing equipment, discharge tube/lamp manufacturing, glass molding, etc., can solve problems such as easy breakage of convex parts, achieve improved mechanical strength, low breakage incidence, and avoid operation The effect of an increase in the number of processes
Inactive Publication Date: 2008-03-26
PANASONIC CORP
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Problems solved by technology
[0011] However, when the inventors mass-produced bulb-type fluorescent lamps, the problem that the convex portion formed in the approximate center of the double-helical glass tube was easily broken in the manufacturing process of the mass-produced lamps occurred. A double-helical glass tube with protrusions formed by the above-mentioned conventional method is used
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[0054] The best mode for carrying out the present invention will be described in detail with reference to the accompanying drawings.
[0055]
[0056] Fig. 1 and Fig. 2 respectively show the typical luminous tube and the overall structure of the lamp of the 22W light bulb type fluorescent lamp variety replacing the 100W general light bulb according to the embodiment of the present invention.
[0057] The luminous tube 1 is formed by using a double helical glass tube 2 as a container, and airtightly sealing a pair of wires 7a-7b, 8a-8b at the ends 3, 4 of the tube. The pair of wires 7a-7b, 8a -8b holds the tungsten wire electrodes 5 and 6 respectively through glass bead installation. At the pipe end 3, an exhaust pipe 9 is also packaged (the end portion is closed after the luminous tube is exhausted).
[0058] The main inner surface of the glass tube 2 is coated with a rare earth phosphor 10, and in addition to about 5 mg of mercury, 400 Pa of argon is enclosed as a buffer g...
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Abstract
The invention relates to a method of manufacturing a double helical glass tube with a convex portion. In the double helical glass tube with protrusions produced by the method of the present invention, the protrusions are less likely to be broken. The method of the present invention includes: making the convex part (32) of the central part (13) of the glass tube (23) deformed into a double helix shape thicker than the other parts of the glass tube; locally heating the convex part; The process of forming and softening the predetermined part of the convex part, and the process of forming the convex part (14) by blowing nitrogen gas (27) from the end of the glass tube to expand the predetermined part of the convex part forming part. Since the portion where the convex portion is to be formed is thickened in advance, sufficient strength can be ensured even if the portion becomes thinner when the convex portion is expanded to form the portion.
Description
technical field [0001] The invention relates to a manufacturing method of a double helical glass tube, a luminescent tube for a fluorescent lamp and a fluorescent lamp. Background technique [0002] With the advent of the energy-saving era, in the lighting field, bulb-type fluorescent lamps and compact fluorescent lamps are also popularized as energy-saving light sources instead of general light bulbs. [0003] Conventional bulb-type fluorescent lamps have been downsized by developing the same outer shape as general incandescent bulbs. Recently, an arc tube made of a double helical glass tube, which is particularly advantageous for this miniaturization, has been adopted. [0004] This luminous tube is formed by folding back a glass tube at an approximately central portion, and turning both side portions of the glass tube sandwiching the approximately central portion around a helical axis. A pair of electrode parts are sealed at both ends of the glass tube, and rare gases f...
Claims
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IPC IPC(8): H01J9/24H01J61/33C03B23/045C03B23/07
CPCC03B23/07C03B23/045C03B23/06H01J9/247
Inventor 板谷贤二中野宪次
Owner PANASONIC CORP