JP2012094471A - Fluorescent lamp, compact fluorescent lamp and luminaire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fluorescent lamp having a spacer capable of suppressing damage due to deformation of an arc tube due to external pressure and suppressing deterioration with time.
A resin spacer 7 is disposed between a pair of straight portions 4c constituting an arc tube 4 of a fluorescent lamp 1, and a resin spacer on one side of a virtual plane along a direction in which the pair of straight portions are adjacent to each other. The silicone resin 8 is applied only to the surface of 7. By attaching the other side, on which the silicone resin 8 is not formed, to the luminaire so as to face the irradiation direction, the shadow of the silicone resin 8 during lighting is less noticeable.
[Selection] Figure 2

Description

  The present embodiment relates to a fluorescent lamp having a spacer interposed between bulbs, a bulb-type fluorescent lamp, and an illumination device including these lamps.

  In recent years, fluorescent lamps have been reduced in size, increased in efficiency, and increased in output, and development of fluorescent lamps that can be replaced with general incandescent bulbs and high-intensity discharge lamps has been progressing.

  For example, a fluorescent lamp is known in which the length of the straight tube portion of the bent bulb is increased to ensure a discharge path in order to obtain the same level of light flux while making the external dimensions of the HID lamp equal. (See Patent Document 1).

Japanese Patent Laid-Open No. 2006-92836

  When such a fluorescent lamp is attached to a lighting fixture, if the tip of the bulb is squeezed strongly, the bulb will be deformed by applying force in the direction intersecting the straight pipe section, or the bulbs adjacent to each other will collide and break. There is a risk. Therefore, the breakage of the valve is suppressed by interposing a spacer made of silicone resin or the like between the valves.

  However, even when a silicone resin having a relatively high hardness is used, the silicone resin is deformed by an external pressure, so that the valve may be deformed and damaged.

  The present embodiment has been made in view of the above-described problems, and suppresses damage caused by deformation of the arc tube due to external pressure, and also suppresses deterioration in appearance during lighting by a spacer, a light bulb An object of the present invention is to provide a fluorescent lamp.

  The fluorescent lamp of the present embodiment includes an arc tube having a plurality of bulbs bent in a U-shape having at least a pair of linear portions and a bent portion; and a translucent tube disposed between the pair of linear portions of the arc tube. A resin spacer; a silicone resin applied only to the surface of a resin spacer on one side of a virtual plane along a direction in which a pair of linear portions are adjacent; holding the arc tube at one end and supplying power to the other end And a cover body having a base to be connected.

  According to the fluorescent lamp of the present embodiment, since the silicone resin is applied only to the surface of the resin spacer on one side of the virtual plane along the direction in which the pair of linear portions are adjacent, the silicone resin is formed. By attaching to the lighting fixture so that the other side not facing the irradiation direction, the shadow of the silicone resin during lighting can be made inconspicuous while the function of the resin spacer is exhibited throughout the lifetime.

1 is a schematic side view showing a bulb-type fluorescent lamp according to a first embodiment of the present invention. FIG. 2 is a schematic top enlarged view showing a mounting portion of the arc tube and spacer of FIG. 1. The schematic side view which shows the fluorescent lamp which concerns on the 2nd Embodiment of this invention. FIG. 3 is a schematic top cross-sectional view showing a mounting portion of the arc tube and spacer of FIG. 2. The schematic side view which shows the fluorescent lamp which concerns on the 3rd Embodiment of this invention. FIG. 6 is an enlarged schematic top view showing a mounting portion of the arc tube and spacer of FIG. 5. The schematic upper surface enlarged view which shows the modification of the attachment part of the arc tube and spacer of FIG. The schematic block diagram which shows the illuminating device which is embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In addition, the same code | symbol is attached | subjected to the same or equivalent part in several attached drawing.

  FIG. 1 is a side view showing a bulb-type fluorescent lamp according to the first embodiment, FIG. 2 is a schematic enlarged top view of a mounting portion of the arc tube and spacer of FIG. 1, and FIG. 3 is a diagram of the second embodiment. 4 is a schematic side view showing such a fluorescent lamp, FIG. 4 is a schematic enlarged cross-sectional view of the mounting portion of the arc tube and spacer in FIG. 3, and FIGS. 5, 6 and 7 show the fluorescent lamp according to the fourth embodiment, respectively. FIG. 8 is a schematic configuration diagram showing an embodiment of an illumination device.

  As a member having a buffering action between the bulbs constituting the arc tube of the fluorescent lamp of the present embodiment, a silicone resin excellent in workability is less likely to deteriorate with time and is low in cost, so that it is highly useful. However, even if the hardness after curing is high, it is insufficient to suppress the external pressure.

  On the other hand, the resin spacer has strength against external pressure, and even when the tip of the arc tube is strongly gripped when the lamp is attached or detached, the arc tube can be prevented from being deformed. However, resin spacers tend to deteriorate more easily than silicone resins when subjected to thermal effects during lighting, thermal deformation of bulbs, and ultraviolet rays from fluorescent lamps. In particular, spacers that are affected by heat during lighting and that are interposed between adjacent straight tube parts are subject to thermal pulling of the bulb due to thermal deformation of the bulb, and are affected by heat such as ultraviolet rays. Since it hardens and shrinks and the adhesive strength with the valve weakens, the spacer may easily fall off when the contact area with the valve is small. Therefore, such a problem can be solved by interposing a silicone resin for suppressing the dropping of the resin spacer.

  However, when a silicone resin is applied to reinforce the spacer, if the silicone resin has low translucency, it becomes noticeable as a shadow during lighting. Therefore, in the fluorescent lamp of this embodiment, the silicone resin is applied only to the surface of the resin spacer on one side of the virtual plane along the direction in which the pair of linear portions are adjacent.

  The bent bulb constituting the arc tube is formed in a U-shaped shape by heating and melting almost the center of the straight tube glass and bending or molding the straight tube glass. Here, “formed in a U-shape” means that the straight tube bulb is formed such that the discharge path is folded at the bent portion and the discharge path is bent, and the bent portion is curved or circular. It is not limited to what was formed in the arc shape. In short, it means a bulb formed so that one ends of the straight portions are continuous so that the discharge path is bent. Further, the bent valve may be connected by a communication pipe formed by blowing and breaking one end of two substantially parallel straight portions.

  According to the fluorescent lamp of the present embodiment, the contact area with the arc tube is secured by the spacer formed on the same curvature surface as the arc tube outer shape curvature, so that the connection strength can be improved. Further, since the silicone resin is applied from above the spacer interposed between the adjacent valves, it is possible to suppress the dropout due to the deterioration of the spacer having a large contact area. Moreover, since the resin spacer between the valves is interposed, the occurrence of damage due to external pressure can be reliably suppressed. Furthermore, since the silicone resin is applied only to the surface of the resin spacer on one side of the virtual plane along the direction in which the pair of linear portions are adjacent, it is lit even when the translucency of the silicone resin is low It is possible to suppress the appearance of the shadow from becoming unnoticeable.

  The bulb-type fluorescent lamp according to another embodiment includes the fluorescent lamp disposed so that all straight portions of the bulbs are located on the circumference, and a substrate and a plurality of electronic components mounted on the substrate. A lighting device that outputs high-frequency power to the fluorescent lamp; and a cover body that houses the lighting device.

  Still another embodiment of the illumination device includes: the fluorescent lamp or the bulb-type fluorescent lamp; and an instrument body to which the fluorescent lamp or the bulb-type fluorescent lamp is attached.

  Next, this embodiment will be described in detail with reference to the drawings. A bulb-type fluorescent lamp 1 shown in FIG. 1 has a cover 3 having a base 2 at one end (lower end in FIG. 1) in the height direction (tube axis direction), and the other end (upper end in FIG. 1) side of the cover 3. The arc tube 4 supported, the holder 5 attached to the cover 3 supporting one end side of the arc tube 4, the lighting tube 4 covering the arc tube 4 and housed inside the holder 5, the base 2 and the cover 3 on one end side A device 6 is provided.

  The base 2 is an Edison type E26 type, and is provided with a cylindrical shell provided with a screw thread, and an eyelet provided on the top of one end side of the shell via an insulating portion. The other end of the shell is covered with one end of the cover 3 and fixed by an adhesive or caulking.

  The cover 3 is formed of a heat-resistant synthetic resin such as polybutylene terephthalate (PBT), for example, and a base 2 is attached to one end (lower end in FIG. 1) of the cover 3.

  The lighting device 6 includes a circuit board (not shown) housed in the cover 3, and a plurality of electrical components are mounted on the circuit board to constitute a high-frequency lighting circuit for lighting the arc tube at high frequency.

  The holder 5 is formed in a covered cylindrical shape with a heat-resistant synthetic resin such as PBT, for example, and a cover 3 is provided at one end (lower end in FIG. 1) on the lower peripheral edge portion of the disk-shaped substrate portion forming the lid portion. It is fixed with an adhesive or the like.

  The holder 5 forms insertion holes through which the pair of end portions of the arc tube 4 are inserted on the substrate portion, and these insertion holes are formed.

  For example, a phosphor of a three-wavelength type is formed on the inner surface of the bent bulb 4a constituting the arc tube 4, and a sealed gas containing a rare gas such as argon or mercury is sealed inside the bent bulb 4a.

  The arc tube 4 has three U-shaped bent bulbs 4a arranged at predetermined positions, and sequentially connected via a communication tube 4b to form one discharge path. The three bent bulbs 4a The linear portion 4c of the valve is disposed on the circumference.

  Each bent bulb 4a is made of lead-free glass having an outer tube diameter of about 11 mm, an inner tube diameter of about 9.4 mm, and a wall thickness of about 0.8 mm, and has a height that smoothly curves the middle portion of the straight tube glass bulb. It is bent to about 55 mm and is formed in a substantially U shape with a bent portion.

  As shown in FIG. 2, there are seven spacers made of a translucent resin made of acrylic resin between the adjacent bulbs in the vicinity of the boundary region between the bent portion 4d and the straight portion 4c of the bent valve 4a. ing. The spacer 7 may be formed of a light-transmitting material such as polycarbonate, PET, or fluororesin.

  In addition, the silicone resin 8 is apply | coated only to the surface side of the resin spacer 7 of any one side of the virtual plane along the direction where a pair of linear part 4c, 4c adjoins. The silicone resin 8 has a hardness of 40 to 80 and has a certain elasticity. The silicone resin 8 is preferably made of a material having a high surface reflectance such as white.

  The silicone resin interposed between the valves may be either a naturally curable silicone resin or a thermosetting silicone resin. In short, the silicone resin may be interposed between the resin spacer and the valve. The type, hardness, viscosity and the like are not limited.

  The fluorescent lamp of the present embodiment is preferably used in a manner such that it is attached to a lighting fixture so that the other side of the U-shaped bent bulb on which the silicone resin 8 is not formed faces the irradiation direction.

  Since the silicone resin 8 is applied only to one side of the spacer 7, the radiated light of the bulb 4 is transmitted from the other side of the spacer 7, and the silicone resin 8 is applied to the one side and the other side as in the first embodiment. Compared with the case where it is applied to the film, the shadow during lighting becomes less conspicuous.

  In addition, the spacer 7 is made of a plastic material having excellent translucency, and is reinforced with the silicone resin 8 so that the spacer 7 is firmly fixed to the arc tube 4 and is used as a cushioning material for withstanding the load in the compression direction. It is possible to exhibit the functions of the product throughout its lifetime. In the present embodiment, the spacer 7 is formed between a pair of adjacent straight portions 4c, 4c, but the spacer 7 may be interposed between the straight portions 4c, 4c of the adjacent bent valves 4a. Good.

  A fluorescent lamp 10 shown in FIG. 3 includes a plurality of bent bulbs and a resin cap 30 attached to an end of an arc tube composed of the plurality of bent bulbs.

  FIG. 4 is a schematic top sectional view showing a portion where the valve linear portion 4c and the spacer 7 of FIG. 3 are attached. Between the phosphor layer 41 formed in the valve linear portion 4c and the inner surface of the bulb. A reflection layer 42 is formed, and an aperture 43 is formed on the opposite side of the phosphor layer 41 from the reflection layer 42. The reflective layer 42 is provided on one side of a virtual plane formed by the arc tube 4, and the aperture 43 is provided on the other side.

  In the present embodiment, the resin spacer 7 is omitted and the silicone resin 8 is applied only to one side of the arc tube 4, but the spacer 7 may be provided as in the first embodiment.

  As in the present embodiment, by providing the arc tube 4 with the reflective layer 42 and the aperture 43, it is possible to effectively illuminate the object.

  FIG. 5 is a schematic side view showing a fluorescent lamp 10 according to the third embodiment, and FIGS. 6 and 7 are schematic top views of a mounting portion of the arc tube 4 and the spacer 7 in FIG. In the present embodiment and the following embodiments, the same components as those in the first and second embodiments are denoted by the same reference numerals, and detailed description thereof will be omitted unless there is a difference in configuration.

  In the arc tube 4 of this embodiment, the two straight tube bulbs 4d are arranged close to each other in parallel, and one end thereof is hermetically closed. The communication pipe 4b is formed by a blow-off method at a position slightly retracted from one end to the other end side of the straight pipe 4d, and has an H shape.

  The base 30 is attached to the pair of straight pipe valves 4d so as to hold both ends of the pair of straight pipe valves 4d.

  As shown in FIG. 6 and FIG. 7, the spacer 7 is formed, for example, with a concavo-convex portion that can be fitted to each other by a substantially trapezoidal translucent member on the upper bottom. The spacers 7 are inserted into each other from the upper bottom where the concavo-convex portions are formed from both sides of the virtual plane along the direction in which the pair of straight pipe valves 4d are adjacent to each other, and the concavo-convex portions are fitted together. The spacer 7 is fixed by filling the silicone resin 8 between 4d.

  Further, as shown in FIG. 7 as another spacer 7, a pair of straight pipe valves 4 d has a straight portion 7 a parallel to a virtual plane along the adjacent direction, and the curvature of the outer periphery of the valve from both ends of the straight portion 7 a It has the same curvature and has a pair of elastic pieces 7b that come into contact with the outer surface of the straight pipe valve 4d.

  As shown in FIG. 7A, the pair of elastic pieces 7b of the spacer 7 is press-fitted into a virtual plane along the direction in which the straight pipe valve 4d is adjacent, and the spacer straight portion 7a side and the straight pipe valve 4d are connected to the silicone resin 8 as shown in FIG. Can be fixed. In addition, as shown in FIG.7 (b), you may fix each other by interposing the silicone resin 8 on the pair of elastic piece side of the spacer 7 press-fitted into the straight pipe valve 4d.

  According to these fluorescent lamps 10 of the present embodiment, since the spacer 7 is interposed between adjacent bulbs, it becomes easy to suppress damage to the arc tube 4 due to external pressure. Furthermore, since the deterioration with time can be suppressed by coating the spacer 7 with the silicone resin 8, it is possible to prevent the spacer 7 from dropping before the lifetime of the fluorescent lamp.

  FIG. 8 is a schematic configuration diagram of a lighting apparatus 100 according to another embodiment. The lighting device 100 is a lighting device such as a downlight, for example, and includes a lighting fixture body 200. A socket 210 and a reflector 220 are attached in the luminaire main body 200, and the base 30 of the compact fluorescent lamp 10 is attached to the socket 210.

  According to the illumination device 100, since the compact fluorescent lamp 10 faces downward, the illuminance directly below can be improved.

DESCRIPTION OF SYMBOLS 1 ... Bulb type fluorescent lamp, 2 ... Base, 3 ... Cover, 4 ... Light-emitting tube, 5 ... Holder, 6 ... Lighting device, 7 ... Spacer, 8 ... Silicone resin, 10 ... Compact fluorescent lamp, 30 ... Base, 100 ... Lighting device.

Claims (3)

An arc tube having a plurality of bulbs bent into a U-shape having at least a pair of straight portions and bent portions;
A translucent resin spacer disposed between a pair of straight portions of the arc tube;
A silicone resin applied only to the surface of the resin spacer on either side of the virtual plane along the direction in which the pair of linear portions are adjacent;
A cover body that holds the arc tube on one end side and has a base connected to a power source on the other end side;
A fluorescent lamp characterized by comprising: The fluorescent lamp according to claim 1, wherein all the straight portions of each bulb are arranged on the circumference;
A lighting device having a substrate and a plurality of electronic components mounted on the substrate and outputting high-frequency power to the fluorescent lamp;
A cover body containing the lighting device;
A bulb-type fluorescent lamp characterized by comprising: A fluorescent lamp or a bulb-type fluorescent lamp according to claim 1;
An instrument body to which the fluorescent lamp or the bulb-type fluorescent lamp is attached;
An illuminating device comprising:

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