JP2005197051A - Noble gas fluorescent lamp - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a noble gas fluorescent lamp with a light utilization rate improved, free from problems of a positional slip of a lamp caused by a fixing method at a lamp holder part or contact failure due to volatilization of low-molecular siloxane in an adhesive even with a temperature rise at a tube wall. <P>SOLUTION: Of the noble gas fluorescent lamp with a pair of electrodes arranged in opposition at an outer wall of a straight-tube glass bulb along a tube axis direction, with noble gas containing xenon gas as a main component sealed in the bulb, with a phosphor layer formed over a whole length of a bulb inner wall in the tube axis direction except at an aperture part, and with a lamp holder fitted at an end part of the bulb, the lamp holder is composed of an aperture positioning member for setting an aperture opening position and a lamp fixing member for fixing the lamp, of which the aperture positioning member, of cross-section C-shaped resin, is fixed to the noble gas fluorescent lamp by a heat-shrinkable tube, and is fitted into and fixed to the lamp fixing member. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a rare gas fluorescent lamp used for illuminating a document used for information equipment such as a facsimile, a copying machine, and an image reader.

As a discharge lamp used as a light source for reading information devices such as facsimiles, copiers, and image readers, a pair of striped external electrodes are provided on the outer wall of the glass bulb, and a rare gas such as xenon gas is placed inside the glass bulb. Enclosed rare gas fluorescent lamps are known.
In a rare gas fluorescent lamp in which such an external electrode is arranged on the outer surface of the glass bulb, the lead wire for power feeding is connected to a power feeding terminal connected to the external electrode on one end side of the glass bulb, and through a lamp holder. Derived. A rare gas fluorescent lamp has a structure in which a lamp holder is attached to an end of a glass bulb and is held by the lamp holder.

  FIG. 1 is an example of a side view showing a partial cross section of a conventional rare gas fluorescent lamp 10 in the tube axis direction. FIG. 2 shows a line segment A- perpendicular to the tube axis direction in FIG. It is sectional drawing cut | disconnected by A '. FIG. 1 also shows the lamp holder 8. The glass bulb 1 is hermetically sealed at both ends, and a pair of electrodes composed of one electrode 2 and the other electrode 2 ′ are formed on the outer surface of the dielectric formed by the tube wall of the glass bulb 1 and Opposing to each other through the discharge space. The glass bulb 1 is filled with a rare gas containing xenon gas as a main component, and the phosphor layer 3 is formed on the inner surface by applying a phosphor. A part of the phosphor layer 3 is removed in the tube axis direction of the glass bulb 1, thereby forming an aperture portion 9 for extracting light. Symbol 4 is a heat-shrinkable tube made of an insulating resin that covers the outer peripheral surface of the glass bulb 1 including the pair of electrodes 2, 2 ′.

  Next, a method for holding the lamp will be described. The rare gas fluorescent lamp 10 has a lead wire 6 for supplying a high-frequency voltage connected to a power supply terminal 5 connected to the lamp end portion of the external electrode, and is adapted to the outer diameter of the glass bulb 1 of the rare gas fluorescent lamp 10. The rare gas fluorescent lamp 10 is fixed by the adhesive 7 with the end of the fluorescent lamp inserted into a cap-shaped lamp holder 8 having an inner diameter.

  As the material of the lamp holder 8, a resin such as polycarbonate or polybutyl terephthalate is used. For the adhesive 7, a polyamide-based adhesive, a silicon-based adhesive, or both adhesives are used together, or silicone rubber is used as a substitute for the adhesive. This is described in, for example, JP-A-2002-279889.

  As the document surface reading speed of a copying machine or the like increases, the amount of light of the rare gas fluorescent lamp needs to be increased, and the input power to the rare gas fluorescent lamp increases. As the input power to the rare gas fluorescent lamp is increased, the tube wall temperature of the lamp rises and may reach 160 ° C. at the end of the lamp in an actual machine such as a copying machine.

  As described above, in a rare gas fluorescent lamp having a structure that is fixed to the lamp holder with an adhesive, as the tube wall temperature rises, the hot-melt adhesive such as polyamide-based adhesive softens and the position of the lamp is shifted. Problems arise. The position of the aperture portion is displaced due to the displacement of the lamp bulb with respect to the lamp holder, and image unevenness occurs when the document is read.

In addition, in the case of silicon adhesive and silicone rubber, the low molecular weight siloxy acid contained therein adheres to the contact by volatilization, and SiO ₂ which is an insulator is formed by electric spark, resulting in poor conduction of the contact portion. For this reason, in a contact part, problems, such as a contact failure by volatilization of low molecular siloxy acid, can be considered.

  Even for lamp holders, polybutylene terephthalate resin (PBT resin) and polycarbonate resin (PC resin), which have been used in the past, exceed the rated temperature of the UL standard that indicates the heat resistance of each resin under the usage environment of the lamp. There was a risk of deformation of the shape. The UL standard is a standard of Underwriters Laboratories Inc., and its rated temperature is the initial physical property value of 50% when exposed to the plastic (resin) material at a constant temperature for 100,000 hours. A constant temperature is displayed and expressed in ° C.

In order to solve these problems related to the lamp holder, conventionally, a method of cooling a rare gas fluorescent lamp with a fan has been taken. For this reason, installation of a fan for cooling the lamp, equipment around the lamp with a dust-preventing filter against dust caused by scattering of paper dust and toner itself, increase the size and cost of fluorescent lamp peripheral equipment, uniform Problems such as an increase in development man-hours and cost increase due to structural design for lamp cooling have occurred.
JP 2002-279889 A

  Accordingly, an object of the present invention is to provide a rare gas fluorescent lamp used for reading an original document of an information device. Even when the tube wall temperature of the lamp rises, the position of the lamp due to the fixing method in the lamp holder portion or the adhesive The problem of contact failure due to volatilization of low molecular weight siloxy acid contained in the lamp does not occur, and a cooling fan is not required for cooling the lamp, and the light utilization rate has been improved by removing the adhesive that previously blocked the light. An object of the present invention is to provide a rare gas fluorescent lamp for reading an original.

  In order to solve the above-mentioned problems, the invention according to claim 1 is characterized in that a pair of electrodes are arranged opposite to each other along the tube axis direction on the outer wall of a straight tubular glass bulb, and inside the glass bulb is xenon gas. A predetermined amount of rare gas containing the main component is sealed, a phosphor layer is formed on the inner wall of the glass bulb except for the aperture that extends over the entire length in the tube axis direction, and a lamp holder is attached to the end of the glass bulb The lamp holder includes an aperture positioning member that determines an aperture opening position of the rare gas fluorescent lamp and a lamp fixing member that fixes the rare gas fluorescent lamp, and the aperture positioning member It is made of a resin having a C-shaped cross section, and is fixed to the rare gas fluorescent lamp by a heat shrinkable tube, and the aperture positioning member is fitted and fixed to the lamp fixing member. It is an rare gas fluorescent lamp, wherein Rukoto.

  The invention described in claim 2 is characterized in that a projection provided on the outer periphery of the aperture positioning member and a recess provided in the inner surface of the lamp fixing member are fitted together. It is what.

  The invention according to claim 3 is the rare gas fluorescent lamp according to claim 1 or 2, wherein an opening is provided in the lamp fixing member in accordance with the aperture opening. is there.

  According to a fourth aspect of the present invention, a U-shaped notch is provided on the outer periphery of the aperture positioning member, and a shrinkable tube is placed over the notch and is contracted and fixed. The rare gas fluorescent lamp according to any one of Items 3 is used.

  The invention according to claim 5 has a structure in which a lead wire guide portion is provided in the vicinity of the lead wire outlet of the lamp fixing member, and the lead wire can be fixed to the lead wire guide portion with a shrink tube, a binding band or the like. A rare gas fluorescent lamp according to any one of claims 1 to 4 is provided.

  The aperture portion is a glass bulb region that emits light to the outside of the fluorescent lamp in a fluorescent lamp, and a portion where the phosphor is not coated on the bulb inner surface over the entire length of the bulb in the tube axis direction of the straight tubular glass bulb. Say.

  In the present invention, the lamp holder for fixing the glass bulb is composed of two members, one is a member for defining the aperture opening, and the other is a member for fixing the rare gas fluorescent lamp. This is a rare gas fluorescent lamp that is fixed by a fixing method that does not use an agent, specifically a shrinkable tube or a fixed fitting, and has a structure that does not affect the rise in tube wall temperature of the rare gas fluorescent lamp. Since the aperture portion can be opened over the entire area by not using the agent, the light emitting region is not wasted.

  According to the present invention, even if the lamp tube wall temperature rises under a use condition where the input power of the lamp is large, the displacement due to the softening of the adhesive in the lamp holder and the volatilization of the volatile components contained in the adhesive It is possible to provide a rare gas fluorescent lamp that does not cause any trouble such as poor electrical contact. As a result, it is possible to provide a rare gas fluorescent lamp that does not require a cooling device such as a fan for cooling the lamp when the rare gas fluorescent lamp is incorporated in an OA device such as a copying machine or a scanner.

  According to the present invention, since there is no waste in the light emitting areas at both ends of the glass bulb, the illuminance is increased by 5% at a position 150 mm from the lamp center as compared with the product with the adhesive.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. 3, 4, and 5. The same reference numerals are assigned to the same components as those of the conventional lamp shown in FIG. FIG. 3 is a perspective view of the lamp holding portion on one end side of the rare gas fluorescent lamp in the present invention. 4 is a cross-sectional view taken along the line BB ′ in the tube axis direction of FIG. FIG. 5 is a perspective view of a lamp fixing member 80 and an aperture defining member 81 having a C-shaped cross section that defines the aperture. Both ends of the glass bulb 1 of the rare gas fluorescent lamp 10 are hermetically sealed, and a pair of electrodes composed of one electrode 2 and the other electrode 2 ′ are formed on the outer wall of the tube wall of the glass bulb 1. Opposing to each other through the dielectric wall and the discharge space. The other end of the glass bulb (not shown) is held with the same structure as the lead wire side, or is held only with a holder as described in, for example, Japanese Patent Application Laid-Open No. 11-273628.

  The glass bulb 1 is filled with a mixed gas of xenon gas and neon gas at a total enclosure pressure of 15 kPa to 93 kPa, and a phosphor layer is formed on the inner surface by applying a phosphor. A part of the phosphor layer is removed in the tube axis direction of the glass bulb 1, thereby forming an aperture portion 9 for extracting light. The cross-sectional structure in the direction perpendicular to the tube axis of the lamp is the same as that of FIG. 2 showing a cross-sectional view of a conventional lamp structure.

  3 and 5, the lamp holder 8 includes a lamp fixing member 80 for fixing the lamp and an aperture positioning member 81 having a C-shaped cross section for defining the aperture portion 9. In a state where the glass bulb 1 is inserted into the aperture positioning member 81, the U-shaped notch 81 a is covered with a heat shrinkable tube 82, and the glass bulb 1 is fixed to the C-shaped aperture positioning member 81. At this time, the inner diameter of the aperture positioning member 81 is designed to have a clearance so that the lamp can be inserted into the lamp holder even if the lamp outer diameter varies. For example, the variation in the lamp outer diameter is about 0.15 mm for a glass bulb having an outer diameter of 9.8 mm. A pair of protrusions 81 b and 81 b ′ are provided on the outer periphery of the aperture positioning member 81, and are fitted into and fixed to the pair of notches 80 b and 80 b ′ on the outer periphery of the lamp fixing member 80.

  In the lamp structure of the present invention, since the lamp bulb temperature is directly applied to the lamp holder, the material is stable in insulation and mechanical strength even at high temperatures, and has a UL standard rated temperature of 170 ° C. or higher. PPS resin), polytetrafluoroethylene (fluororesin) and the like are suitable. Furthermore, since this resin has higher strength and higher rigidity than the conventionally used polybutylene terephthalate resin (PBT resin) and polycarbonate (PC resin), it can maintain higher retention characteristics because it does not deform due to shrinkage of the shrinkable tube. .

  Since the conventional rare gas fluorescent lamp of FIG. 1 uses an adhesive, it is necessary to make the adhesive wrap around the glass bulb in the lamp holder, and the aperture opening of that portion is blocked. However, since the rare gas fluorescent lamp of the present invention does not use an adhesive, it is possible to provide a translucent portion over the entire glass bulb by providing the aperture notch 86 in the lamp fixing member.

6A and 6B show an example in which a lead wire guide 87 is provided in the vicinity of the lead wire outlet 84 of the lamp fixing member. FIG. 6 (a) shows a state in which a glass bulb is incorporated,
In FIG. 6B, by providing the lead wire guide 87 and holding it by the heat shrinkable tube 12, it is possible to eliminate a load from being directly applied to the joint portion (not shown) of the lead wire with the electrode power feeding portion.

  As described above, according to the present invention, even if the lamp tube wall temperature rises under a use condition where the input power of the lamp is large, it is included in the occurrence of deviation due to softening of the adhesive in the lamp holder portion or in the adhesive. There are no problems such as poor conduction of electrical contacts due to volatilization of volatile components.

  Further, in the rare gas fluorescent lamp of the present invention, the bowl-shaped insulating reflective molded body 11 disclosed in Japanese Patent Laid-Open No. 2003-168393 shown in a perspective view in FIG. 7 is attached with the opening of the bowl aligned with the aperture opening. Thus, it is possible to provide a high-illuminance and high input current type rare gas fluorescent lamp.

  Furthermore, the illuminance at the end of the lamp can be improved by making the adhesive part translucent. As a result, it is possible to provide a rare gas fluorescent lamp that does not require a cooling device such as a fan for cooling the lamp by extending the effective light emission length when the rare gas fluorescent lamp is incorporated into an OA device such as a copying machine or a scanner. .

The side view shown in the partial cross section of the tube axis direction of the conventional noble gas fluorescent lamp is shown. Sectional drawing cut | disconnected by line segment AA 'in FIG. 1 is shown. The perspective view of the lamp holding | maintenance part of the one end side of the noble gas fluorescent lamp in this invention is shown. Sectional drawing of the pipe-axis direction cut | disconnected by line segment BB 'in FIG. 3 is shown. The perspective view of a lamp fixing member and an aperture definition member is shown. The example which provided the lead wire guide in the lamp fixing member is shown. The perspective view of an insulating shaping | molding reflector is shown.

Explanation of symbols

1 Glass bulb
2, 2 'electrode 3 phosphor layer 4 heat shrinkable tube 5 power supply terminal 6 lead wire 7 adhesive 8 lamp holder 9 aperture 10 noble gas fluorescent lamp 11 insulating reflective molded body 12 heat shrinkable tube 80 lamp fixing member 80b, 80b' Notch 81 Aperture positioning member 81a U-shaped notch 81b, 81b 'Protrusion 83 Heat shrink tube 84 Lead wire outlet 86 Aperture notch 87 Lead wire guide

Claims (5)

A pair of electrodes are arranged opposite to each other along the tube axis direction on the outer wall of the straight tubular glass bulb,
A predetermined amount of rare gas mainly containing xenon gas is sealed inside the glass bulb,
A rare gas fluorescent lamp in which a phosphor layer is formed on the inner wall of the glass bulb except for an aperture portion extending substantially along the tube axis direction, and a lamp holder is attached to an end of the glass bulb,
The lamp holder includes an aperture positioning member that determines an aperture opening position of the rare gas fluorescent lamp and a lamp fixing member that fixes the rare gas fluorescent lamp,
The aperture positioning member is made of a resin having a C-shaped cross section, and is fixed to the rare gas fluorescent lamp by a heat-shrinkable tube, and the aperture positioning member is fitted and fixed to the lamp fixing member. Noble gas fluorescent lamp. 2. The rare gas fluorescent lamp according to claim 1, wherein a projection provided on the outer periphery of the aperture positioning member and a recess provided on the inner surface of the lamp fixing member are fitted together. The rare gas fluorescent lamp according to claim 1, wherein an opening is provided in the lamp fixing member in accordance with an aperture opening. The rare shape according to any one of claims 1 to 3, wherein a U-shaped cutout portion is provided on an outer periphery of the aperture positioning member, and a shrinkable tube is placed on the cutout portion to be contracted and fixed. Gas fluorescent lamp. The lead wire guide portion is provided in the vicinity of the lead wire outlet of the lamp fixing member, and the lead wire is fixed to the lead wire guide portion with a shrinkable tube, a binding band or the like. Item 5. A rare gas fluorescent lamp according to Item 4.

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