JP2005108685A - Bulb - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive bulb superior in a glare prevention characteristic regarding the bulb in which an optical film is formed on the outer face of a halogen lamp or the like. <P>SOLUTION: This is equipped with an exothermic tube 2 having an exothermic part to house a filament 3, a pair of sealing end parts 5b to be pinch-sealed on both sidewards in the stem direction of this exothermic part and to airtightly seal the bulb, and a pair of lead wires connected to the filament and airtightly extended out respectively from the pair of sealing end parts 5b to the exterior, an optical film 10 in which an optical film solution is applied and formed on the outer face of the exothermic tube except a non-coating region 9 to which the optical film solution is not applied, from a prescribed spacing 1 apart from the point S to the outer end Oe of this sealing end part, from one inner end ie of the pair of sealing end parts to the filament side, and a frost part 11 which is frost-treated in the non-coating region. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a tube having an optical film formed on the outer surface thereof, such as a halogen lamp used as a heating lamp.

  Conventionally, tube heating lamps that emit infrared and visible light for studio, industrial heating, heating, etc., contain a tungsten filament in the radiation transmissive bulb, while reflecting on the bulb outer surface. Some have formed a film (see, for example, Patent Document 1).

This reflective film is composed of, for example, a plurality of high-refractive index layers mainly composed of Ta ₂ O ₅ and a plurality of low-refractive index layers mainly composed of SiO ₂ operable at a temperature of about 950 ° C. or less. It has band pass characteristics for the radiation to be transmitted.

Also, as an example of a lamp used as an infrared light source, a lamp is known in which an optical film that absorbs light in the visible wavelength range and selectively transmits the infrared wavelength range is formed on the outer surface of the bulb. (For example, refer to Patent Document 2).
Japanese Unexamined Patent Publication No. 60-1751 JP 2002-352612 A

  However, the heating lamp described in Patent Document 1 has glare when the lamp is viewed directly. In order to prevent or reduce this glare, it is necessary to sufficiently reduce the emission of visible light.

  In order to realize this, the number of high refractive index layers and low refractive index layers must be increased. However, if the number of layers (films) of these optical films is increased, the manufacturing cost is increased, and the heat resistance of the optical film is reduced, causing peeling and cracking, and uneven color during lighting. is there.

  For this reason, it is conceivable to form a bulb using colored glass. However, this causes a problem that the infrared transmittance is also lowered, and the infrared light emission efficiency is also lowered.

  The present invention has been made in view of such circumstances, and an object thereof is to provide an inexpensive tube having excellent antiglare properties.

  The invention according to claim 1 of the present application is connected to the heat generating part that houses the heat generating source, the pair of sealing ends that are pinch-sealed and hermetically sealed on both sides in the axial direction of the heat generating part, and the heat generating source. A heat generating pipe having a pair of lead wires that air-tightly extend from the pair of sealed end portions to the outside, respectively, at a predetermined distance from one inner end of the pair of sealed end portions to the heat generating portion side An optical film formed by applying the optical film solution to the outer surface of the heat generating tube other than the non-application area where the optical film solution is not applied to the outer end of the sealing end; and frosted in the non-application area And a frosted portion.

  The invention according to claim 2 of the present application is connected to the heat generating portion for accommodating the heat generating source, a pair of sealing ends that are pinch-sealed and hermetically sealed on both sides in the axial direction of the heat generating portion, and the heat generating source. A heat generating tube having a pair of lead wires that air-tightly extend from the pair of sealed end portions to the outside; a frost portion formed by frosting the heat generating tube; and formed on the frost portion A tube characterized by comprising: an optical film;

  According to the present invention, the antiglare effect of the heat generating tube can be improved.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, the best embodiment of the invention will be described with reference to the accompanying drawings. In the plurality of attached drawings, the same or corresponding parts are denoted by the same reference numerals.

  FIG. 1 is an enlarged vertical sectional view of a principal part of an axial end of a tubular halogen lamp, which is an example of a bulb according to an embodiment of the present invention, and FIG. 2 is a schematic view of almost the entire halogen lamp shown in FIG. It is a partially cutaway side sectional view.

  As shown in these drawings, the halogen lamp 1 has a tube shape often used as a heater for keeping food, for example, and has a heat generating tube 2 made of quartz glass having radiation permeability.

  The heat generating tube 2 contains a tungsten filament 3 as an example of a heat source concentrically therein. The filament 3 is supported concentrically with the heat generating tube 2 by a plurality of anchors 4, 4. In addition, the heat generating tube 2 is filled with a necessary amount of a halogen group element (I, Br, Cl, F) together with an inert gas such as argon, and a pinch seal that crushes both axial ends in the diameter direction. A pair of rectangular flat end portions 5a and 5b are formed, and molybdenum foils 6a and 6b having a rectangular foil shape are embedded in the sealed end portions 5a and 5b, respectively.

  Each molybdenum foil 6a, 6b is connected at its inner end to both ends in the axial direction of the filament 3 via a pair of inner lead wires 7a, 7b, while at each outer end, a pair of outer lead wires 8a, 8b are connected to each other. The outer lead wires 8a and 8b extend from the sealed end portions 5a and 5b to the outside in an airtight manner.

As shown in FIGS. 1 and 2, the optical film 10 is entirely applied to the outer surface of the heat generating tube 2 at one of the pair of sealed end portions 5a and 5b, for example, at a place other than the non-application region 9 on the 5b side. Forming. As the optical film 10, for example, a reflective film formed by a single layer of a low refractive index film mainly containing SiO ₂ or a high refractive index film mainly containing Fe ₂ O ₃ , or both of these layers are alternately arranged. An anti-glare film or the like can be formed by forming it in a plurality of layers, for example.

  The non-coating region 9 of the optical film 10 is a region where an optical film solution for forming an optical film is not applied, and is one end of the heating tube 2, for example, the inner end ie of 5b, and the filament 3 of the heating unit. A point which is a predetermined distance 1 away from the side, for example, 3 mm, is set as a starting point S, and the entire outer surface from the starting point S to one sealing end 5b side to the outer end Oe is set. However, the predetermined interval 1 from the inner end ie to the starting point S may be at least 3 mm or more, and can be appropriately changed according to the length of the entire length of the heat generating tube 2.

  FIG. 1 is a side cross-sectional view showing an enlarged upper portion of the heating tube 2 in order to explain a process of applying an optical film solution for forming the optical film 10 on the outer surface of the heating tube 2 to the outer surface of the heating tube 2. FIG.

  That is, as shown in FIG. 1, one heating end, for example, 5b is held up and the heating tube 2 is held in a substantially vertical state, and the solution surface is in the upper sealing end in the optical film solution. It immerses (dips) until it reaches the starting point S in the vicinity of the part 5b. Thereafter, after the required time has elapsed, the heating tube 2 is again pulled up vertically from the optical film solution.

  As a result, the optical film solution is applied to the outer surface of the heating tube 2 at the starting point S or less, and is not applied to the non-application region 9 above the starting point S at all. For this reason, since the optical film solution is not applied to the predetermined interval l between the starting point S and the inner end ie of the one sealing end 5b, it is formed when the optical film solution is applied to the predetermined interval l. It is possible to prevent or reduce the accumulation of liquid. For this reason, it is possible to prevent or reduce liquid dripping or uneven coating due to liquid pooling.

  That is, when the optical film solution is applied, when one of the sealing end portions 5b is erected in the substantially vertical direction, the inner end ie of the sealing end portion 5b moves downward in FIG. Is formed with a conical portion that gradually increases in diameter. For this reason, when the heating tube 2 is dipped in the optical film solution and then pulled outward in the vertical direction, a part of the optical film solution is likely to be accumulated on the outer surface of the conical portion.

  However, in the heat generating tube 2, since the optical film solution is not applied to the non-application region 9 from the starting point S to the outer end Oe of the upper sealing end 5b as described above, a liquid pool is formed and the liquid does not drip. It is possible to prevent or reduce the occurrence of uneven coating.

  As a result, in the conventional halogen lamp, the coating unevenness of the optical film can be visually confirmed at the boundary portion between one sealed end and the heat generating portion, and the reflection when the optical film is a reflective film can be confirmed. The variation width of the rate was about 10%.

  On the other hand, in the halogen lamp 1 according to the present embodiment, the application unevenness of the optical film could not be confirmed by visual observation at the boundary portion between the one sealed end portion 5b and the heat generating portion. The variation width was about 1 to 3%, and most of the experimental products did not show variation.

  Therefore, according to the heat generating tube 2, uneven application of the optical film solution can be prevented at the boundary portion between the one sealed end 5 b and the heat generating portion on the filament 3 side. Since the optical film 10 is not formed, light leaks and the antiglare effect is reduced.

  Therefore, in the present embodiment, the entire outer surface of the non-application area 9 of the heat generating tube 2 is formed in the frost portion 11. The frost portion 11 is formed on the entire outer surface of the non-application region 9 of the heat generating tube 2 by a frost process such as an etching process, and forms a large number of minute irregularities. Note that the frosted portion 11 may be formed overlappingly on a part of the optical film 10.

  Therefore, according to this heat generating tube, the light leaked from the non-application region 9 to the outside is diffused by a large number of minute irregularities of the frosted portion 11, so that the antiglare effect can be improved.

  Further, since the frost portion 11 has a large number of minute irregularities formed on the outer surface thereof to increase the outer surface area, the heat radiation effect of the molybdenum foil 6b of the one sealing end portion 5b can be improved.

  FIG. 3 is a partially cutaway longitudinal sectional view of a halogen lamp 1A according to the second embodiment of the present invention. This halogen lamp 1A has a frost portion 11A formed on the outer surface other than the non-application area 9 of the halogen lamp 1 shown in FIGS. 1 and 2 by etching or the like as indicated by a broken line in FIG. As indicated by a chain line, an infrared transmission visible light blocking multilayer film 10A is formed as an example of an optical film on the frost portion 11A. Except for this feature, the configuration is substantially the same as the halogen lamp 1 described above. 4 is an enlarged view of the IV part of FIG. 3, and a frost part 11A in which a number of minute irregularities are formed by frosting the outer surface of the heat generating tube 2, and an infrared transmission visible visible light formed on the frost part 11A. The longitudinal cross-sectional view with 10 A of light shielding multilayer films is expanded and shown.

  Therefore, according to the halogen lamp 1A, the infrared rays emitted from the filament 3 can be diffused by the frost portion 11A on the outer surface of the heating tube 2, so that the amount of infrared rays emitted from the heating tube 2 is almost uniform. can do.

  Moreover, since the infrared transmission visible light blocking multilayer film 10A is formed on the outer surface of the heat generating tube 2, an antiglare effect for reducing or preventing glare when the heat generating tube 2 is directly viewed can be achieved.

  Furthermore, since the infrared transmission visible light blocking multilayer film 10A is formed on the frost part 11A of the heating tube 2, the light diffusion effect by the frost part 11A and the antiglare effect of the infrared transmission visible light blocking multilayer film 10A are The antiglare effect can be further improved.

Table 1 below shows the antiglare effect and wavelength transmission by the halogen lamp 1A according to the second embodiment and the halogen lamp (non-processed product) that does not include the frosted portion 11A and the infrared transmission visible light blocking multilayer film 10A. It is a comparison table of rates.

  In addition, you may form the frost part 11A by a frost process in the whole outer surface of the non-application area | region 9 of said one sealing edge part 5b.

  FIG. 5 is a partially cutaway longitudinal sectional view of a halogen lamp 1B according to a third embodiment of the present invention. This halogen lamp 1B is obtained by replacing the filament 3 of the halogen lamp 1A shown in FIG. 3 with a filament 3B in which a plurality of coil portions 3a are sequentially connected by a plurality of connecting lines 3c. 11B is characterized in that it is selectively formed on the outer surface of the heat generating tube 2 only at a location corresponding to the coil portion 3a of the filament 3B. Except for this feature point, the configuration is almost the same as that of the halogen lamp 1A, and the infrared transmission visible light blocking multilayer film 10B indicated by the alternate long and short dash line in FIG. Forming.

  The halogen lamp 1B can also double anti-glare the infrared rays emitted from the coil portions 3a of the filament 3B by the frost portions 11B and the infrared transmission visible light blocking multilayer film 10B, thereby improving the anti-glare effect. Can be made.

  Further, in the halogen lamp 11B, the frost portions 11B are not formed on almost the entire outer surface of the heat generating tube 2, but are formed on the outer surface of the heat generating tube 2 only at locations corresponding to the coil portions 3a. The frost processing operation can be facilitated and speeded up.

The principal part longitudinal cross-sectional view of the halogen lamp which concerns on 1st Embodiment of this invention. FIG. 2 is a partially cutaway longitudinal sectional view showing almost the entire configuration of the halogen lamp shown in FIG. 1. The partially cutaway longitudinal cross-sectional view of the halogen lamp which concerns on 2nd Embodiment of this invention. The IV section enlarged view of FIG. The partially cutaway longitudinal cross-sectional view of the halogen lamp which concerns on 3rd Embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Halogen lamp, 2 ... Heat generating tube, 3 ... Tungsten filament, 5a, 5b ... A pair of sealing edge part, 6a, 6b ... A pair of molybdenum foil, 8a, 8b ... Outer lead wire, 9 ... Non-application | coating area | region, 10 DESCRIPTION OF SYMBOLS ... Optical film, 11a ... Outer tube, ie ... Inner end of sealed end, l ... Predetermined interval, Oe ... Outer end of sealed end, S ... Starting point

Claims (2)

A heat generating part that houses the heat generating source, a pair of sealing ends that are pinched and sealed airtight on both sides in the axial direction of the heat generating part, and a pair of sealed end parts that are connected to the heat generating source A heating tube having a pair of lead wires each hermetically extending to the outside;
On the outer surface of the heat generating tube other than the non-application region where the optical film solution is not applied from a position spaced from the inner end of one of the pair of sealed end portions to the heat generating portion side to the outer end of the sealed end portion. An optical film formed by applying an optical film solution;
A frosted portion that has been frosted in the non-application area;
A tube characterized by comprising: A heat generating part that houses the heat generating source, a pair of sealing ends that are pinched and sealed airtight on both sides in the axial direction of the heat generating part, and a pair of sealed end parts that are connected to the heat generating source A heating tube having a pair of lead wires each hermetically extending to the outside;
A frost portion formed by frosting the heating tube;
An optical film formed on the frost portion;
A tube characterized by comprising:

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