JP2006114352A - Compact self-ballasted fluorescent lamp - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact self-ballasted fluorescent lamp capable of approximating light distribution characteristics similar to that of an incandescent lamp and improving light emitting efficiency. <P>SOLUTION: This is equipped with a translucent cover 3, a globe 4 attached to the cover, an arc tube 5 having extension parts 11b, 12b which are housed in the globe and in which at least one part of an light emitting part is extended and exists in the cover, a holder 6 which is attached to the cover and supports the extension parts of the light emitting tube, a base 2 attached to this holder, and a lighting circuit 7 arranged and installed in this base. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a bulb-type fluorescent lamp having a base for an incandescent bulb or the like.

  Conventionally, as an example of this type of bulb-type fluorescent lamp, there is one having a cover having a base that can be attached to a socket of a general lighting bulb such as an incandescent bulb. Then, the lighting circuit is housed in the cover, and a holder that fixes the arc tube is attached to the opening of the cover, and an opening edge of the glove that accommodates the arc tube is attached, and the cover and the glove are bonded with an adhesive. A bulb-type fluorescent lamp is known.

In recent years, in order to obtain the same light distribution characteristic as that of an incandescent bulb, a bulb-type fluorescent lamp in which numerical values of dimensions such as a globe and a cover are limited has been proposed (for example, see Patent Document 1).
JP 2000-21208 A

  However, in such a conventional bulb-type fluorescent lamp, since the cover is opaque, visible light emitted from the end portion of the arc tube is also irradiated to the cover side. However, most of the visible light emitted from the arc tube is shielded by the light-impermeable cover, and light is hardly irradiated to the outside. For this reason, there exists a subject that it is difficult to obtain the light distribution characteristic similar to the incandescent lamp which light-emits all the area | regions except a nozzle | cap | die.

  The present invention has been made in view of such circumstances, and provides a bulb-type fluorescent lamp that can be approximated to the same light distribution characteristic as an incandescent bulb and can improve luminous efficiency. Objective.

  The invention according to claim 1 is a translucent cover having a base at one end and a holding portion for holding the arc tube at the other end; a glove attached to the cover; An arc tube having at least a part extending in the cover; and at least a part disposed in the base and a lighting circuit for lighting the arc tube. This is a light bulb shaped fluorescent lamp.

  In the first aspect of the present invention, the light emitting portion of the arc tube is a discharge path portion that emits light, and excludes portions other than the non-light emitting portion such as an exhaust tube sealed at the end of the arc tube. In addition, the cover has a cylindrical portion to which a base is attached at one end, and has a substantially conical rotating body shape that is extended from one end to the other end in an expanded shape.

  The holding portion for holding the arc tube is preferably a separate structure from the cover as a holder having a shape in which the end of the arc tube can be inserted and attached, but may be an integral structure with the cover.

  Further, the arc tube held by the cover is formed in a U-shaped shape by heating and melting and bending the substantially central portion of the straight tubular glass bulb, or by molding the glass bulb. Here, “bently formed in a U shape” means that the glass bulb is formed such that the discharge path is folded at the bent portion and the discharge is bent, and the bent portion is curved or circular. It is not limited to those formed in an arc shape, and includes a shape in which a bent portion is formed in a square shape or a sharp 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 one end of two substantially parallel straight portions, or may be formed in a spiral shape. The bending valve may not be made of glass, and is allowed to be formed of a material such as ceramic that can form a light-transmitting airtight container.

  The arc tube is composed of a single bent bulb, and the glass bulbs communicate with each other so that at least one discharge path is formed inside by connecting the ends of a plurality of bent bulbs via a communicating tube. It may be arranged in parallel.

  A phosphor layer is applied directly or indirectly to the inner surface of the arc tube. Examples of the phosphor layer include, but are not limited to, rare earth metal oxide phosphors and halophosphate phosphors. However, in order to improve luminous efficiency, it is preferable to use a three-wavelength emission type phosphor in which phosphors emitting red, blue and green light are mixed.

  In the arc tube, electrodes are sealed at both ends of a discharge path formed in the arc tube. Examples of the electrode include a hot cathode made of a filament, a ceramic electrode carrying an electron emitting material, and a cold cathode made of nickel.

  A discharge medium is sealed inside the arc tube. The discharge medium is made of an inert gas such as argon, neon, krypton, or xenon and mercury.

  As the base, a screw-in type called an E-type for an incandescent lamp is usually used, but it is not limited to this. Further, the base need not be directly attached to the cover, but may be indirectly attached to the case or a part of the cover may constitute the base.

  The invention according to claim 2 is the electrode type fluorescent lamp according to claim 1, wherein an electrode is sealed in the extending portion.

  The invention according to claim 3 is the electrode type fluorescent lamp according to claim 1, wherein no electrode is sealed in the extending portion.

  The invention according to claim 4 is the light bulb-type fluorescent lamp according to any one of claims 1 to 3, wherein the cover includes a holding portion for holding the extending portion.

  According to the first aspect of the present invention, since at least a part of the arc tube extends in the translucent cover, the translucent cover can emit light.

  In addition, since at least a part of the lighting circuit is disposed in the base and the arc tube extends in the cover, a relatively long discharge path can be secured, and the entire bulb-type fluorescent lamp can be reduced in size. be able to. That is, the light emission efficiency can be improved as compared with the case where the light-transmitting lighting circuit is disposed in the light-transmitting cover and the light shielding amount is increased by the lighting circuit.

  That is, according to the present invention, since most parts other than the base can be made to emit light, it is possible to improve the light emission efficiency as a whole of the bulb-type fluorescent lamp, and more closely approximate the light distribution characteristics of the incandescent bulb. Light distribution characteristics can be obtained.

  According to the invention which concerns on Claim 2, a connection with the lighting circuit arrange | positioned at the nozzle | cap | die side becomes easy.

  According to the invention which concerns on Claim 3, since the filament etc. are not interposed in the extension part, the visible light emitted from an arc_tube | light_emitting_tube can be radiated | emitted.

  According to the invention which concerns on Claim 4, since an arc_tube extension part is supported, the holding | maintenance of an arc_tube can be supported easily and reliably.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In these drawings, the same or corresponding parts are denoted by the same reference numerals.

  1 is a partially schematic longitudinal sectional view of a light bulb shaped fluorescent lamp 1 according to a first embodiment of the present invention, FIG. 2 is a development view of the arc tube shown in FIG. 1, and FIG. 3 is an enlarged bottom view of the main part of the arc tube. FIG.

  As shown in FIG. 1, a bulb-type fluorescent lamp 1 includes an E26-type base 2 that can be attached to a socket of a general lighting bulb such as an incandescent bulb, a translucent cover 3, a translucent globe 4, and a globe. 4 includes an arc tube 5 of a fluorescent lamp housed in 4, a holder 6 that supports the arc tube 5, and a lighting circuit 7 housed in the base 2. The envelope composed of the cover 3 and the globe 4 has an outer shape that approximates the standard size of a general lighting bulb. The general lighting bulb is defined in JIS C 7501. In the following description, the base 2 side is the lower side and the globe 4 side is the upper side.

  The cover 3 is formed in a substantially cylindrical shape that expands upward in FIG. 1 from a heat-resistant synthetic resin or milky glass having translucency such as polycarbonate (PC) or polybutylene terephthalate (PBT).

  The globe 4 is made of a transparent or light diffusing milky white or the like, and is formed of a glass or a synthetic resin into a smooth spherical shape having substantially the same shape as a glass bulb of a general lighting bulb. The cover 3 is fitted into the opening at the upper end of the cover 3 and fixed by a transparent adhesive g such as a silicon adhesive. The globe 4 can be combined with another member such as a diffusion film to improve luminance uniformity.

  The combination of the globe 4 and the arc tube 5 to be described later increases the light output irradiated in the direction of the base 2, and a light distribution characteristic close to that of a general lighting bulb can be obtained.

  As shown in FIGS. 1 to 3, the arc tube 5 has a glass bulb 8, and a phosphor (phosphor layer) is formed on the inner surface of the bulb 8. A rare gas such as mercury and mercury are enclosed, and a pair of electrodes 9 and 9 are sealed at both ends of the bulb 8 by a pinch seal or the like.

  The valve 8 is configured as, for example, a parallel 4U pipe, and four U-shaped bent valves 10, 11, 12, and 13 are juxtaposed at a predetermined interval. These bulbs 10 to 13 are sequentially connected at their lower end side surfaces in FIGS. 1 and 2 by a connecting tube 15 to form one continuous discharge path. As shown in FIG. 3, the curvature radii of the U-shaped bent portions 10 a and 13 a of the both-end valves 10 and 13 positioned at both ends of the valves 10 to 13 are the intermediate valves positioned in the middle of the aligned direction. 11 and 12 are formed larger than the radius of curvature of the U-shaped bent portions 11a and 12a.

  Further, the valve 8 is provided with a cylindrical thin tube, which is also referred to as an exhaust pipe, projecting from at least one axial end of each of the U-shaped bent valves 10 to 13 in a communicating state. For example, as shown in FIG. 2, thin tubes 11 c and 12 c are protruded from the respective ends on the other end side of the electrode sealing ends of the intermediate valves 11 and 12. Exhaust in the valve 8 is performed through the narrow tubes 11c and 12c, and after the sealed gas is sealed and replaced, the distal ends of the narrow tubes 11c and 12c are sealed. When the thin tubes 11c and 12c are sealed, main amalgam is enclosed. The thin tubes 11c and 12c may be one or three or more.

  As shown in FIG. 1, the valve 8 has a lower end outer peripheral surface facing the inner peripheral surface of the cover 3 bonded to the inner peripheral surface of the cover 3 with an adhesive g such as a transparent silicon adhesive.

  1 to 3, the valve 8 is a straight pipe portion of the intermediate valves 11 and 12, and is a straight pipe portion 11b located substantially at the center of the 4U parallel arrangement of the U-shaped valves 10 to 14. , 12b are longer than the lower ends of the other valves 10 to 13 in the vertical direction, and are extended to the base 2 side in the cover 3 so as to extend as one unit. It is coupled to.

  Each of the electrodes 9 has a filament coil made of a triple coil in which, for example, a tungsten (W) wire is triple-wound, and this filament coil is supported by a pair of wells (introduction lines) fixed by a bead stem. Four outer leads 16 led out to the outside of each U-shaped bent valve 10-13 through a jumet wire sealed to the glass at the axial end of the U-shaped bent valve 10-13. 16,... These outer leads 16 are connected to the lighting circuit 7.

  The lighting circuit 7 includes a disk-like circuit board 7a that is horizontally arranged and fixed in the opening end of the base 2 in FIG. 1, and the circuit board 7a includes a plurality of lighting components (electric parts) 7b, 7b... Is configured as an inverter circuit (high frequency lighting circuit) that performs high frequency lighting.

  The holder 6 is inserted into the bottomed hollow frustoconical holder main body 6a fixed to the lower reduced diameter opening end of the cover 3, the disc-shaped bottom portion 6b of the holder main body 6a, and the base 2. And a cylindrical base mounting portion 6c to be fixed. The holder main body 6a, its bottom portion 6b, and the base mounting portion 6c are integrally coupled with transparent PTB, PC, or synthetic resin such as polyethylene terephthalate (PET).

  The holder main body 6a has an upper end of the opening abutted against a reduced diameter opening end of the cover 3, and the abutting ends are fixed to each other with an adhesive or the like. Further, on the upper surface in FIG. 1 of the holder bottom portion 6b, supporting concave portions 8 and 8 for holding the lower end portions (end portions on the base 2 side) in FIG. 1 of the extending portions 11b and 12b of the arc tube 5 in place are held. Forming. The holder bottom portion 6b is formed as a lid portion that closes the upper open end of the base 2. The holder bottom portion 6b is inserted through the four outer leads 16, 16,. The insertion hole which does not do is drilled. Each outer lead is inserted through these insertion holes and connected to the lighting circuit board 7a. Further, the lighting circuit board 7a is connected to the shell of the base 2 and the inner surface of the eyelet by a wire (not shown).

  The base mounting portion 6c is electrically insulated by fitting a metal base 2 on the outer peripheral surface thereof, fixing it by caulking or an adhesive, and covering the inner peripheral surface of the shell of the base 2. 2 is closed by the holder bottom 6b.

  Therefore, according to the bulb-type fluorescent lamp 1, one end portion of the arc tube 5 is extended and extended into the translucent cover 3 as the extending portions 11b and 12b. Since the light can be emitted and emitted to the outside, the overall brightness of the bulb-type fluorescent lamp 1 can be improved.

  In addition, since the extending portions 11b and 12b are located at the radial center of the arc tube 5, the brightness uniformity around the central axis of the arc tube 5 can be improved.

  In addition, since the holder 6 interposed between the translucent cover 3 and the metal base 2 is also transparent, most parts other than the base 2 can emit light. Thereby, the silhouette (outer shape) and light distribution characteristics of the bulb-type fluorescent lamp 1 can be further approximated to the silhouette and light distribution characteristics of a general lighting bulb such as an incandescent lamp.

  Further, the outer peripheral surface of the lower end portion of the arc tube 5 is adhered and fixed to the inner peripheral surface of the cover 3 with an adhesive g, and the extending portions 11 b and 12 b of the arc tube 5 are fitted into the support recess 8 of the holder 6. Since it supports, the support strength of the arc_tube | light_emitting_tube 5 can be improved.

  Further, since the holder 6 made of an electrically insulating synthetic resin covers and electrically insulates the shell inner peripheral surface of the base 2 by the base mounting portion 6 c, the holder 6 is disposed in the base 2. It is possible to prevent the lighting circuit component 7b from coming into contact with the inner peripheral surface of the base 2 and causing a short circuit.

  Furthermore, since the opening end of the base 2 is closed by the holder bottom portion 6b, the heat generation of the arc tube 5 and the heat generation of the lighting circuit 7 can be blocked. For this reason, it is possible to prevent or reduce overheating of the bulb-type fluorescent lamp.

  In each of the above-described embodiments, the case where the so-called 4U parallel-type arc tube 5 is used has been described. However, the present invention is not limited to this, and for example, the number of U-shaped bulbs is not limited. If it is one or more, it may be 2, 3, 4, 5, 6, 7 or 8 or more. Furthermore, the arrangement of the U-shaped valves is not limited to the above-described parallel arrangement, and a delta arrangement in which three U-shaped valves are arranged in a triangle, or a quadrangular shape with four or more U-shaped valves, or a large number of quadrangular or more It may be a polygonal array forming a square. Furthermore, you may seal the electrode 9 to the edge part of a pair of extension part 11b, 12b of the arc_tube | light_emitting_tube 5, respectively. According to this, since the electrode 9 approaches the lighting circuit board 7a, the outer lead 16 can be shortened correspondingly, and the ease of connecting the outer lead 16 and the lighting circuit board 7a can be improved. it can.

  Furthermore, a spiral fluorescent lamp 5S shown in FIG. That is, the pair of electrode sealing end portions 14a and 14b of the spiral fluorescent lamp 5S may be extended into the translucent cover 3, and this also allows the translucent cover 3 to be extended by the extended portion. The outer surface can emit light.

  Furthermore, the extending portions 11b and 12b of the arc tube 5 are not limited to a linear shape, and may be bent or curved into a required shape such as a dogleg.

  Further, the narrow tube may be provided at the ends of the extending portions 11 b and 12 b of the arc tube 5, and the tip of the thin tube is further extended inside the base 2, the cover 3 and the globe 4. Alternatively, the distal ends of the extended portions of these thin tubes may be connected to the cover 3 or the globe 4. According to this, since the tips of the extending portions of these thin tubes can be cooled via the cover 3 or the globe 4 that is exposed to the outside and easily cooled, the coldest portion temperature can be lowered.

1 is a schematic longitudinal sectional view of a bulb-type fluorescent lamp according to a first embodiment of the present invention. The expanded view of the arc tube shown in FIG. The bottom view of the arc tube shown in FIG. The front view of a spiral-shaped fluorescent lamp.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Bulb-type fluorescent lamp, 2 ... Base, 3 ... Light-shielding cover, 4 ... Globe, 5 ... Arc tube, 6 ... Holder, 6a ... Holder main body, 6b ... Holder bottom part, 6c ... Holder base mounting part, 7 ... Lighting circuit, 7a ... Circuit board, 7b ... Lighting circuit component, 9 ... Electrode, 10, 11, 12, 13 ... U-shaped bulb, g ... Adhesive.

Claims (4)

A translucent cover having a base at one end and a holding portion for holding the arc tube at the other end;
A glove attached to this cover;
An arc tube having an extension portion housed in the globe and having at least a portion of the light emission portion extending into the cover;
A lighting circuit that is at least partially disposed in the base and lights the arc tube;
A bulb-type fluorescent lamp characterized by comprising: 2. The electrode-type fluorescent lamp according to claim 1, wherein an electrode is sealed in the extending portion. 2. The electrode-type fluorescent lamp according to claim 1, wherein an electrode is not sealed in the extending portion. The bulb-type fluorescent lamp according to any one of claims 1 to 3, wherein the cover includes a holding portion for holding the extending portion.

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