JP2009259766A - Self-ballasted fluorescent lamp and illumination apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact self-ballasted fluorescent lamp capable of preventing deterioration of a globe, made of synthetic resin and provide a lighting fixture using the compact self-ballasted fluorescent lamp. <P>SOLUTION: The compact self-ballasted fluorescent lamp is provide a cover 2, equipped with a base 1 on one end, a light-emitting tube 4 which has a pair of electrodes 4q, 4r and is composed of a bulb 4d, provided with an ultraviolet absorbing film 4n between an inner wall surface 41 and a phosphor layer 4m, a globe 6 composed of translucent synthetic resin in which an ultraviolet absorbing agent is added, and a lighting unit 5 housed inside the cover. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a light bulb-type fluorescent lamp having a synthetic resin globe and a lighting fixture using the light bulb-type fluorescent lamp.

  A cover is provided on a base that can be attached to a socket of a general lighting bulb such as an incandescent bulb, and a fluorescent lamp and a lighting device formed by bending a glass tube bulb are attached to a holder in the cover. There is known a bulb-type fluorescent lamp that is covered with a synthetic resin glove that can absorb ultraviolet rays (for example, Patent Document 1).

In recent years, as shown in FIG. 9, in order to further reduce the size and increase the output, the arc tube 40 arranged in a narrow space in the globe 30 is connected to the reduced diameter portion of the globe at the maximum diameter portion 30a of the globe. There has been proposed one that is bent so as to form a spiral portion 40a having a portion larger than the inner diameter of 30b, thereby increasing the discharge path length. In this bulb-type fluorescent lamp, the arc tube 40 cannot be inserted into the globe 30 because the outer diameter of the maximum diameter portion 40 b of the spiral portion 40 a is larger than the opening diameter of the reduced diameter portion 30 b of the globe 30. For this reason, the globe 30 is made of an easily molded synthetic resin, divided into the reduced diameter portion 30b side and the top end portion 30c side, and linear discharge paths 30d and 30d are inserted into the divided reduced diameter side, The joint 50 divided by covering the top end 30c side is joined by adhesion or the like.
Japanese Patent Laid-Open No. 2005-174637

  In the bulb-type fluorescent lamp shown in Patent Document 1, the globe is made of a synthetic resin capable of absorbing ultraviolet rays. However, as shown in FIG. 9, the resin globe and the arc tube come closer to each other by further downsizing. For this reason, even when a globe made of a resin that can absorb ultraviolet rays is used, the amount of light that deteriorates by receiving more ultraviolet rays emitted from the arc tube, changes its color to become yellowish, and passes through the globe over time. This causes a problem of lowering. For this reason, in the light bulb-type fluorescent lamp having this type of synthetic resin globe, how to improve this problem is an important issue.

  The present invention has been made to address the above-described problems, and is intended to provide a bulb-type fluorescent lamp capable of preventing deterioration of a synthetic resin globe and a lighting fixture using the bulb-type fluorescent lamp. To do.

  The invention of the bulb-type fluorescent lamp according to claim 1 includes a cover having a cap at one end; an arc tube comprising a bulb having a pair of electrodes and an ultraviolet absorbing film between the inner wall surface and the phosphor layer; A globe composed of a light-transmitting synthetic resin to which an ultraviolet absorber is added; and a lighting device housed in the cover.

  The globe can be translucent synthetic resin such as polycarbonate, acrylic, polyethylene terephthalate, polyethylene, etc., and can be colorless and transparent, colored or diffused according to the required properties, improving light distribution characteristics Therefore, reflection means such as a reflection film may be formed in part of the globe.

  The shape of the globe is a bulb that has the same external shape as a bulb for a general lighting bulb such as an incandescent bulb, a bulb shape that is commonly called a teardrop shape such as an A shape, an S shape, a PS shape, or a G shape, It is a similar shape having the same shape or substantially the same shape.

  Even if the arc tube is a spiral arc tube formed by bending one straight tubular member into a spiral shape, for example, three U-shaped tubes are arranged in parallel to form one discharge path. A bent arc tube may be used, and the type is not limited to a specific one.

The ultraviolet absorbing film between the inner wall surface of the bulb and the phosphor layer is, for example, fine particles of titanium oxide (TiO ₂ ), zinc oxide (ZnO), cerium oxide (CeO ₂ ), iron oxide (Fe ₂ O ₃ ), etc. An ultraviolet absorbing film mainly composed of is allowed.

  The translucent synthetic resin constituting the globe includes a resin that can absorb ultraviolet rays, for example, a first simple substance M made of carbonates and a second simple substance M having an ultraviolet absorbing function. A copolymer containing ′ is suitable, but a resin obtained by adding an ultraviolet absorber to a polycarbonate (polycarbonate) may also be used. Furthermore, you may make a resin contain a benzoate, a cinnato, a benzotriazole, and an oxanilide type compound as a ultraviolet absorber.

  According to a second aspect of the present invention, in the bulb-type fluorescent lamp according to the first aspect, the opening end formed on the base end side is attached to the cover, and the maximum diameter portion is the maximum on the base end side. A glove that has a reduced diameter part that is reduced in diameter from the diameter part and is divided and joined; and an arc tube that is formed so as to have a larger diameter than the inner diameter of the reduced diameter part of the glove. It is characterized by.

  The split and joined glove is preferably divided along the direction substantially perpendicular to the axis of the glove at the maximum diameter portion of the globe so that the reduced diameter portion side and the top end side of the globe are divided. May be divided on the reduced diameter side or the top end side in the vicinity of, and may be divided in an oblique direction without being orthogonal to the axis. Furthermore, it may be divided in the vertical direction along the axis of the globe. In short, all means for opening the reduced diameter portion are allowed so that the maximum diameter portion of the arc tube can be inserted.

  The arc tube has a continuous virtual outer shape of a bulb arranged along the globe, and is folded back along the inner surface of the globe, which is substantially the same shape as the globe. A discharge path that is relatively longer than the combined conventional bulb is obtained, and the luminous efficiency is improved. For example, in order to approximate the appearance shape to the silhouette of an incandescent light bulb, at least a part of a spiral part formed so that the bulb has a part larger than the inner diameter of the reduced diameter part of the globe at the largest diameter part of the globe And the like formed in a substantially frustoconical spiral shape.

  On the other hand, since the resin globe and the bulb are close to each other, they are easily affected by ultraviolet rays from the arc tube, but the globe and the bulb are each subjected to ultraviolet resistant treatment, so that degradation of the globe is suppressed.

  The invention of the lighting fixture according to claim 3 comprises: a fixture main body provided with a socket; and the bulb-type fluorescent lamp according to claim 1 or 2 attached to the socket of the fixture main body. It is characterized by.

  In the present invention, the fixture main body is a direct ceiling type, a ceiling suspended type, or a wall-mounted type, and even if a glove, shade, reflector or the like is attached to the main body as a light control body, It may be exposed. Moreover, the lighting fixture is not limited to a single bulb-type fluorescent lamp attached to the fixture body, and a plurality of fluorescent lamps may be provided.

  According to the first aspect of the present invention, it is a synthetic resin in which ultraviolet radiation is reduced by an arc tube comprising a bulb provided with an ultraviolet absorbing film between the inner wall surface and the phosphor layer, and an ultraviolet absorber is added. The constructed globe can further prevent deterioration of the resin globe. Furthermore, since the wavelength preferred by insects is also reduced, it is possible to provide a bulb-type fluorescent lamp capable of suppressing insects from flying.

  According to the second aspect of the present invention, the arc tube can increase the discharge path length by forming the bulb so that the bulb has a larger diameter than the inner diameter of the reduced diameter portion of the globe. An arc tube consisting of a globe made of a translucent synthetic resin to which an ultraviolet absorber is added, and a bulb in which an ultraviolet absorbing film is provided between the inner wall surface and the phosphor layer. Thus, it is possible to further prevent the deterioration of the globe composed of the synthetic resin. Furthermore, since the wavelength preferred by insects is also reduced, it is possible to provide a bulb-type fluorescent lamp capable of suppressing insects from flying.

  According to the third aspect of the present invention, it is possible to provide a lighting apparatus using a light bulb shaped fluorescent lamp capable of preventing the deterioration of the globe, and at the same time, it is possible to prevent the discoloration of the apparatus.

  Embodiments of a light bulb-type fluorescent lamp and a lighting fixture using the light bulb-type fluorescent lamp according to the present invention will be described below with reference to the drawings.

  In the present embodiment, for example, a lamp-type fluorescent lamp L1 having a rated lamp power of 10 W and corresponding to an incandescent lamp 60 W, a screw-type base 1 called an E-type, and means such as an adhesive or caulking at one end of the base. The cover 2 fixed in the cover, the holder 3 fixed in the cover, the arc tube 4 constituting the fluorescent lamp supported by the holder, the lighting device 5 accommodated in the cover 2, the globe 6 covering the arc tube 4 and the like Consists of.

  In the following description, the arc tube 4 is on the upper side and the base 1 is on the lower side. The arc tube 4 has a spiral portion 4a formed in the upper portion and a pair of two straight tube portions 4b and 4c formed in the lower portion and having a substantially linear shape, and these are integrally connected. . The spiral portion 4a is formed by bending a straight circular glass bulb 4d having a tube outer diameter of 6 to 9 mm, for example, 8.5 mm into almost equal folds, and forming a folded portion 4f at the equally divided position. As a top, it is wound around a mold (not shown), and is molded into a substantially truncated cone-shaped double helix having a concentric axis spread by overlapping different diameters.

  More specifically, as shown in FIG. 3, the spiral portion 4 a is rotated from one end portion 4 g of the glass bulb 4 d around a pivot axis oo (hereinafter referred to as “lamp axis oo”) of the spiral portion. The first turning portion A that reaches the turn-up portion 4f that is the upper apex while turning while sequentially reducing the spiral diameter and turning from the other end of the turn-up portion 4f around the turning axis oo. However, for example, approximately two rounds (the number of turns) are made so as to have a double spiral shape having the second turning part B reaching the other end part 4h. As a result, the spiral portion 4a has a substantially frustoconical outer shape, and the spiral portion is configured to have a maximum diameter portion 4i formed of a large spiral diameter portion below the spiral shape portion, and these Although it is small in size due to the spiral shape, it is formed with a long discharge path.

  When the arc tube 4 is accommodated in the globe 6, the spiral portion 4a is disposed on the top end portion 6g side including the maximum diameter portion 6c of the globe along the inner surface of the maximum diameter portion 6c. The maximum diameter portion 4 i constitutes a spiral diameter portion larger in diameter than the inner diameter of the reduced diameter portion 6 e of the globe 6. Further, both end portions 4g and 4h of the glass bulb 4d are bent substantially parallel to the lamp axis oo downward from the double spiral end portion of the glass bulb 4d so as to form a discharge path from the spiral portion 4a. A pair of two straight tube portions 4b and 4c having a substantially straight shape are formed, and one longer continuous discharge from the straight tube portion 4b of the glass bulb 4d to the spiral portion 4a to the straight tube portion 4c. A path is formed. The pair of straight tube portions 4b and 4c are arranged so that the outer sides of the pair of straight tube portions are disposed so as to be positioned on the reduced diameter portion 6e side of the globe when the arc tube 4 is accommodated in the globe 6. The drawn virtual circular diameter Φ2 (FIG. 3A) is formed to be smaller than the diameter Φ1 of the maximum diameter portion 4i in the spiral portion 4a.

  A pair of electrodes 4q and 4r are respectively sealed at both ends 4g and 4h of the straight tube portions 4b and 4c, which are both ends of the glass bulb 4d configured as described above, to form electrode sealed end portions 4s and 4t. . For example, a tungsten filament coil electrode is used for the pair of electrodes 4q and 4r. For example, the electrodes 4q and 4r are sealed to the electrode sealing end portions 4s and 4t at both ends of the glass bulb 4d while being temporarily fixed by a flare stem, for example. .

As shown in FIG. 1 (b), the glass bulb 4d has, for example, titanium oxide (TiO ₂ ) extending over the substantially entire length between its inner wall surface 4l, that is, between the glass inner wall surface 4l and a phosphor layer 4m described later. ) And zinc oxide (ZnO) fine particles are formed, and a phosphor layer 4m made of a phosphor film such as a rare earth metal oxide is formed on the upper surface of the ultraviolet absorption film over almost the entire length. . In this example, it is composed of fine particles having an average particle diameter of titanium oxide of 0.03 to 0.05 μm and an average particle diameter of zinc oxide of 0.015 to 0.05 μm, and the mixing ratio thereof is 50% by weight. Yes. The film thickness of the ultraviolet absorbing film 4n is 0.1 μm to 2 μm, preferably 0.3 μm to 0.5 μm. When the film thickness is thinner than 0.1 μm, the ultraviolet absorption action is reduced, and when it exceeds 2 μm, the luminous flux is reduced. The film thickness of the ultraviolet absorbing film 4n is the film thickness at the inner wall surface above the tube body of the glass bulb 4d and at the point P in FIG. 3A (the film thickness is thick at the wall surface below the tube body). easy).

Further, the arc tube 4 in which the ultraviolet absorbing film 4n is formed can reduce Hg emission lines having a wavelength of 365 nm or less that most affect the discoloration of the synthetic resin, as shown by a curve a in the graph of FIG. Light having a wavelength of about 400 nm or less is reduced, and an ultraviolet component can be absorbed from the ultraviolet region to the short wavelength region of visible light. This protects the globe 6 made of synthetic resin, which will be described later, from ultraviolet rays emitted from the arc tube 4, and prevents deterioration of the globe 6 due to ultraviolet rays, such as discoloration, fading, a decrease in transmittance, and embrittlement. At the same time, ultraviolet rays can be reduced and insects can be prevented from flying. FIG. 4 shows the measurement of the UV output (μW / cm ² / nm) in a state where the arc tube 4 of this embodiment is lit without a glove, and a curve a is a characteristic curve of the arc tube 4 of the present embodiment. , Curve b is a characteristic curve of a normal product that does not form an ultraviolet absorbing film, and the arc tube 4 of this example has a Hg emission line with a wavelength of 365 nm or less reduced compared to a normal product, and light with a wavelength of about 400 nm or less. It is shown that the ultraviolet component is favorably absorbed from the ultraviolet region to the short wavelength region of visible light, and the absorption effect of ultraviolet rays is good.

  A discharge medium such as argon or krypton is sealed inside the glass bulb 4d, and narrow tubes 4u and 4v communicating with the inside of the pair of electrode sealing end portions 4s and 4t are projected from the inside of the glass bulb 4d. It contains mercury or amalgam. Further, the folded portion 4f which is the top of the spiral portion 4a is formed in a bulging portion whose glass bulb diameter is larger than the diameter of the first and second swivel portions A and B, and from this bulging portion. An exhaust thin tube 4w is provided in a protruding manner. A coldest part may be formed in the bulging part. Moreover, you may make it accommodate mercury or an amalgam in the thin tube 4w.

  As described above, a pair of substantially frustoconical spiral portion 4a having a maximum diameter portion 4i composed of a large spiral diameter portion and a lower portion of the spiral portion, in other words, a position corresponding to the root portion of the incandescent bulb, An arc tube 4 having straight pipe portions 4b and 4c and having a virtual outer shape of the entire outside forming a substantially mushroom shape is formed. An example of a specific configuration of the arc tube 4 configured as described above is as follows (FIG. 2). That is, the rated value of the bulb-type fluorescent lamp L1 is 10 W, and the arc tube 4 has a diameter Φ1 of the maximum diameter portion 4i of about 50 mm, a height dimension h1 of about 64 mm, and a pair of electrode seals from the horizontal central axis of the maximum diameter portion 4i. The height dimension h2 to the lower surfaces of the toe portions 4s and 4t is about 40 mm. The discharge path length between the pair of electrodes 4q and 4r is 200 to 400 mm, and differs depending on the outer diameter of the glass bulb 4d. For example, when the outer diameter of the glass bulb is 8 mm, the discharge path length is 350 mm, and when the outer diameter of the tube is 9 mm, the discharge path length is 320 mm.

  The arc tube 4 having a substantially mushroom shape configured as described above is supported by the holder 3 in the cover 2 fixed to the base 1. The base 1 is an Edison type E26 type, and is provided with a cylindrical shell 1a having a thread and an eyelet 1c provided on the top of one end side of the shell via an insulating portion 1b. The shell 1a is made of a conductive metal such as a copper plate, and the other end is covered with one end of the cover 2, and is fixed by means of heat-resistant adhesive such as silicone resin or epoxy resin, or caulking.

  The cover 2 has a cover body 2a in which an opening and a cylindrical body are integrally formed of a heat-resistant synthetic resin material such as polybutylene terephthalate (PBT), and a shell 1a of a base 1 is attached to the lower end side of the cover body. On the upper end side of the cover body, an annular opening attachment end 2b that is an attachment end is formed. The opening attachment end portion 2b of the cover 2 is formed as an inverted truncated cone portion that gradually decreases in diameter downward, and is configured to fit an opening end portion 6d on the proximal end side of the globe 6 described later. In the opening attachment end 2b, the opening lower end of the opening of the holder 3 is placed on the annular convex step 2c inside the connecting portion between the opening of the cover body 2a and the cylindrical body, and the silicone. It is fixed with a heat-resistant adhesive such as resin or epoxy resin.

  That is, the holder 3 is formed in a covered cylindrical shape from a heat-resistant synthetic resin material such as polybutylene terephthalate (PBT), for example, and protrudes toward the lower end on the lower peripheral edge of the disc-shaped substrate portion 3a forming the lid. The cylindrical cylindrical portion 3b is integrally formed, and the lower end of the opening of the cylindrical portion is placed on the annular convex stepped portion 2c of the cover body, and a heat resistant adhesive such as silicone resin or epoxy resin is used. It is stuck. The holder 3 supports the arc tube 4 placed on the substrate portion 3a. That is, a concave portion for placing and supporting the lower end portions of a pair of straight tube portions 4b and 4c provided at a position corresponding to the root portion of the spiral portion 4a of the arc tube 4 having a substantially mushroom shape, and these arc tubes A cylindrical protrusion 3c that protrudes into the gap between the lower ends of each of the two and restricts the radial deviation is provided. Further, through holes are formed in the substrate portion 3a on the outside of the cylindrical protrusion 3c, and these through holes protrude outward from the pair of electrode sealing end portions 4s, 4t of the arc tube 4. The thin tubes 4u and 4v and the outer wires 4x and 4y shown in FIG. 3A are inserted, fixed with a heat-resistant adhesive such as silicone resin, and the arc tube 4 is fixed on the substrate portion 3a of the holder 3. To support. Although the cover 2 and the holder 3 are configured separately, they may be formed integrally with a synthetic resin.

  As shown in FIGS. 1 and 2, the lighting device 5 has a circuit board 5a on which a lighting circuit pattern for controlling the lighting of the arc tube 4 is formed in a vertical direction in a pair of vertical grooves 2d and 2d on the inner surface of the base 1. Inserted and fixed. That is, a pair of longitudinal grooves 2d and 2d opposed to each other in the diameter direction are formed in the inner surface of the cover 2 in the base 1 in the axial direction of the base, and both side edges in the width direction have the circuit board 5a in the vertical direction. The part is inserted and fixed. A circuit pattern is formed on one side or both sides of the circuit board 5a, and a plurality of electronic components 5b for configuring a lighting circuit such as lead parts such as electrolytic capacitors and chip parts such as transistors are formed on the mounting surface. -Is implemented.

  Next, the globe 6 has a shape of a PS (Pear Shape type) bulb having a circular cross section used for a general lighting bulb such as an incandescent bulb, and has a thickness, for example, to cover the arc tube 4. 1 to 2 mm, and in this embodiment, about 1.5 mm translucent synthetic resin, transparent or light diffusing milky white, here milky white, glass bulb-shaped smooth in general lighting bulbs such as incandescent bulbs It is formed into a curved surface. That is, the spherical part 6a formed in a substantially spherical shape having the maximum diameter part 6c on the top end part 6g side and the diameter of the maximum diameter part of the spherical part on the proximal end side opening end part 6d side are gradually reduced to a smaller diameter. A substantially cylindrical root portion 6b composed of the reduced diameter portion 6e is integrally formed. The outer diameter D1 of the maximum diameter portion 6c is about 55 mm.

  In this embodiment, an ultraviolet absorbing film 4n is formed on the arc tube 4 to protect the synthetic resin globe 6 from the ultraviolet rays radiated from the arc tube 4 and prevent deterioration of the resin globe due to the ultraviolet rays. As a translucent synthetic resin constituting the globe 6, it is composed of a synthetic resin to which an ultraviolet absorber is added, and the double ultraviolet absorption action of the ultraviolet ray absorbing film of the arc tube and the resin glove capable of absorbing ultraviolet rays reduces the deterioration of the globe. To prevent.

  In this embodiment, as the ultraviolet absorber, the resin contains benzoate, cinnato, benzotriazole, oxanilide compounds, and the like. In addition, the resin itself is composed of a resin that can absorb ultraviolet rays, for example, a copolymer containing a first simple substance M made of carbonates and a second simple substance M ′ having an ultraviolet absorbing function. It does not matter.

  As shown in the graphs of FIGS. 5 (a) and 5 (b), the synthetic resin globe 6 of the present embodiment to which the ultraviolet absorber is added as described above has a total light beam and a linear transmission wavelength of about 350 nm to about 450 nm. Has an absorption wavelength. As a result, the Hg emission line near the wavelength of 365 nm, which affects the deterioration of the synthetic resin, can be reduced by the resin material, and the ultraviolet component can be well absorbed from the ultraviolet region to the short wavelength region of visible light. The globe 6 can be protected from ultraviolet rays radiated from the arc tube 4, and deterioration of the globe 6 due to ultraviolet rays, such as discoloration, fading, a decrease in transmittance, and embrittlement, can be prevented. At the same time, similarly to the arc tube 4, it can absorb ultraviolet rays and suppress the flying of insects.

  FIGS. 5 (a) and 5 (b) show the measurement of the transmittance with respect to the wavelength of light of the globe 6 made of synthetic resin having a thickness of about 1.5 mm to which the ultraviolet absorber of this example was added. The characteristic curve of the synthetic resin globe 6 in the present embodiment, the curve d is the characteristic curve of a conventional glass globe to which no UV absorber is added, and the synthetic resin globe 6 of the present embodiment is a conventional glass globe. The Hg emission line near the wavelength of 365 nm, which has an effect on the deterioration of the synthetic resin, is reduced by the resin material, and the UV component is absorbed well from the UV region to the short wavelength region of visible light. It is shown that there is. FIG. 5A shows the total light transmittance, and FIG. 5B shows the linear transmittance.

  As shown in FIG. 1, the globe 6 has a maximum diameter portion 6c of the globe, and a dividing line Oa-Oa (hereinafter referred to as a dividing line) orthogonal to the lamp axis oo of the arc tube, that is, the axis of the globe. The upper half of the top glove 6X1 on the top end 6g side and the bottom glove 6X2 on the reduced diameter portion 6e side are divided into two in the horizontal direction (horizontal direction). . When the globe 6 having the above configuration is formed of, for example, a non-divided integrally molded product, the outer diameter Φ1 of the maximum diameter portion 4i of the arc tube 4 is larger than the opening diameter of the opening end portion 6d of the globe. Therefore, the arc tube cannot be inserted from the opening end. However, since the globe 6 is divided into a top globe 6X1 and an underglove 6X2 vertically by the dividing line Oa-Oa, the holder and the straight tube portion 4b are established after the arc tube 4 is supported by the holder 3. 4c is inserted from the wide opening end formed by the division of the underglove 6X2 toward the opening end 6d, and the top glove 6X1 is put on the underglove 6X2 from above, and the abutting surfaces of the opening ends of these two gloves are covered. It can be fixed and integrated by ultrasonic welding.

  The globe 6 bonded and fixed as described above has an opening end 6d formed at the base portion 6b, that is, the base end side, and an edge of the opening end together with the cylindrical portion 3b of the holder 3 is an opening of the cover 2. It fits inside the attachment end 2b and is fixed by a heat-resistant adhesive such as silicone resin or epoxy resin. In this light bulb-type fluorescent lamp L1, the holder 3 to which the arc tube 4 is attached is fixed to the cover 2, and after the arc tube portion is covered with the globe 6 by the means described above, the lighting device 5 is attached to the cover 2. A base 1 is attached.

  The light emitting tube 4 of the bulb-type fluorescent lamp L1 configured as described above needs to be arranged along the inner surface of the globe 6 as much as possible in order to increase the discharge path length. It becomes easy to discolor due to heat from the tube and leaked ultraviolet rays. For this reason, it is necessary to manage the space | interval dimension of an arc_tube | light_emitting_tube outer surface and a glove inner surface to a predetermined dimension. In the present embodiment, the distance between the outer surface of the folded portion 4 f that is the top of the arc tube 4 and the inner surface of the globe 6 that is closest is about 2 mm to about 3 mm, and is closest to the outer surface of the maximum diameter portion 4 i of the arc tube 4. The distance between the inner surface of the globe 6 was set to about 3 mm to about 4 mm, and the distance between the outer surface of the straight pipe portions 4c and 4d and the inner surface of the closest globe 6 was set to about 2 mm to about 3 mm.

  As described above, the light-emitting fluorescent lamp L1 corresponding to the incandescent lamp 60W having the rated lamp power of 10W is configured by including the lighting device 5 in the E26-type base, including the substantially mushroom-shaped spiral arc tube 4. . As shown in FIG. 2, the size of the bulb-type fluorescent lamp L1 is, for example, about 109 mm in total length H1 (including 1 part of the base), and about 55 mm in the maximum diameter part D1 that forms a substantially spherical shape. In addition, the bulb-type fluorescent lamp to which the present invention can be applied preferably has a total length H1 (including 1 part of the base) of 110 mm or less and a diameter dimension D1 of the bulged maximum diameter part 4i of 60 mm or less.

  When the bulb-type fluorescent lamp L1 configured as described above is turned on, the ultraviolet rays emitted from the arc tube 4 are shown in FIG. 4 by the ultraviolet absorbing film 4n formed between the glass inner wall surface 4l and the phosphor layer 4m. As shown in the characteristic curve, the Hg emission line with a wavelength of 365 nm or less, which has the most influence on the deterioration of the synthetic resin, is reduced, and the light with a wavelength of about 400 nm or less is reduced, and the ultraviolet component is good from the ultraviolet region to the short wavelength region of visible light. The light rays absorbed by the ultraviolet rays are emitted to the resin globe 6. As a result, the size is further reduced, and deterioration of the resin glove is prevented even when the glove and the valve are close to each other.

Furthermore, according to the light bulb-type fluorescent lamp L1 of the present embodiment, an ultraviolet absorber is added to the globe 6, and the absorption wavelength is set to a wavelength of about 350 nm to about 450 nm as shown in FIGS. 5 (a) and 5 (b). Therefore, the ultraviolet component in the short wavelength region of visible light that could not be absorbed by the ultraviolet absorbing film 4n of the arc tube 4 is also absorbed. Due to these double ultraviolet absorption effects, as shown in FIG. 6, the bulb-type fluorescent lamp L1 of this embodiment has an ultraviolet output of about 300 nm to about 400 nm, which is substantially zero, and the ultraviolet rays are absorbed well. The Thereby, deterioration of the resin glove is prevented and a good luminous flux is obtained for a long time. FIG. 6 shows the measurement of the ultraviolet output (μW / cm ² / nm) of the bulb-type fluorescent lamp L1 of the present embodiment. The curve (solid line) e represents the characteristic curve and curve of the bulb-type fluorescent lamp L1 of the present embodiment. (Dotted line) f is a characteristic curve of a normal product in which the arc tube does not have an ultraviolet absorbing film and an ultraviolet absorber is not added to the globe. The output is shown to be low and approximately zero.

  In addition, the bulb-type fluorescent lamp L1 of the present embodiment can have an ultraviolet output at a wavelength of about 300 nm to about 400 nm to be substantially zero, and the action of the arc tube 4 and the globe 6 is combined to effectively suppress the flying of insects. be able to. That is, FIG. 7 is a graph showing the spectral distribution intensity of various lamps with respect to wavelength and the relative luminous sensitivity of insects as relative intensities, and a curve (solid line) e is a characteristic curve of the bulb-type fluorescent lamp L1 of the present embodiment. A curve (dotted line) f is a characteristic curve of a normal product without an ultraviolet ray absorbing film in the arc tube and no ultraviolet absorber is added to the glove, and a curve (solid line) g is a relative luminous sensitivity curve representing the insect's relative luminous sensitivity. A curve (solid line) h is a characteristic curve of the incandescent lamp. As is apparent from these characteristic curves, the bulb-type fluorescent lamp L1 of the present example has an ultraviolet output of approximately 0 at a wavelength of approximately 300 nm to approximately 400 nm, and substantially absorbs ultraviolet rays at a high level of insect relative luminous sensitivity. It is cut 100% and can effectively prevent insects from flying.

 Table 1 below shows the results of measurement of the insect attractant rate, glove discoloration damage rate, and UV radiation intensity in the light bulb shaped fluorescent lamp L1, the normal product and the incandescent light bulb of this example. The insect attracting rate and the glove discoloration damage rate are percentages (%) in the bulb-type fluorescent lamp L1 of this example and an ordinary product when the incandescent bulb is set to 100. The bulb-type fluorescent lamp L1 and the normal product of this embodiment are equivalent to an incandescent bulb 60W.

上記の表１から分かるように、本実施例の電球形蛍光ランプＬ１は、従来の発光管に紫外線吸収膜がなく、グローブに紫外線吸収剤を添加してしない通常品に比較して大幅に紫外線放射強度が低下し、グローブの変退色損傷率も略半分以下に減少し、なおかつ、昆虫の誘虫率も低い、低誘虫形の電球形蛍光ランプとして構成することができた。

As can be seen from Table 1 above, the bulb-type fluorescent lamp L1 of the present embodiment is much more ultraviolet light than a conventional product that does not have a UV absorbing film in a conventional arc tube and does not have a UV absorber added to a glove. It was possible to construct a low-inspired bulb-type fluorescent lamp in which the radiation intensity was reduced, the rate of damage to the fading color of the globe was reduced to almost half or less, and the insect attracting rate was low.

  The bulb-type fluorescent lamp L1 is turned on by attaching / detaching to / from the socket corresponding to the E26-type base to which an incandescent bulb or the like is attached by gripping and rotating the globe 6. For example, it is used as a light source of a lighting fixture 20 such as a downlight shown in FIG. FIG. 8 is an explanatory view showing a cross section of the lighting fixture 20. In the figure, 21 is a fixture body, 22 is a socket corresponding to a base 26 such as an E26 type provided in the main body 21, and 23 is a reflector. The above-described bulb-type fluorescent lamp L1 is attached to the socket 22.

  Since the bulb-type fluorescent lamp L1 is similar to or has the same shape as a general lighting bulb such as an incandescent bulb, the light distribution of the fixture can be similar to or the same as that of the general lighting bulb. The irradiation amount of the light to the nearby reflector 23 is sufficiently ensured, and the instrument characteristics according to the optical design of the reflector can be obtained. Further, since the spiral portion 4a of the arc tube 4 faces downward, the illuminance directly below can be improved. At the same time, in the bulb-type fluorescent lamp L1 of this embodiment, as described above, the ultraviolet rays radiated from the arc tube 4 are made of the synthetic resin globe 6n to which the ultraviolet ray absorbing film 4n of the arc tube 4 and the ultraviolet absorber are added. Thus, it is possible to prevent deterioration such as discoloration, fading, decrease in transmittance, embrittlement, etc. of the instrument body 21, socket 22, reflector 23, and the like. In particular, when these instrument parts are made of synthetic resin, deterioration can be further prevented. At the same time, the light bulb-type fluorescent lamp L1 of the present embodiment is configured as a low worm-type lamp as described above, so that insects can be prevented from flying, and dirt on the appliances by insects, particularly reflectors and globes. Further, it is possible to prevent stains such as shades and the like, and it is possible to eliminate the trouble of cleaning the instrument and perform desired bright illumination over a long period of time. In addition, if the light source of the luminaire provided with the function of cutting the ultraviolet rays on the shade is used, the light bulb and the fluorescent lamp of the present embodiment will further enhance the double low insect effect of the light source and the shade. Insect flying suppression effect can be achieved.

  As described above, according to the present embodiment, the deterioration of the synthetic resin globe caused by the ultraviolet rays from the arc tube, which becomes a problem when the globe is made of synthetic resin, is caused by the ultraviolet absorbing film 4n formed on the arc tube 4 and the ultraviolet absorber. With the synthetic resin globe 6 to which is added, the double UV absorption action prevents deterioration of the globe, such as discoloration, fading, transmittance decrease, and embrittlement, and a good luminous flux can be obtained over a long period of time. Insects can be prevented from flying. Furthermore, these actions can also suppress discoloration, fading, deterioration of transmittance, deterioration such as embrittlement, dirt due to insects flying, and the like of the lighting fixture itself, peripheral devices and members irradiated by the lighting fixture.

BRIEF DESCRIPTION OF THE DRAWINGS The bulb-type fluorescent lamp of the 1st Embodiment of this invention is shown, (a) is a longitudinal cross-sectional view of front view, (b) is an expanded sectional view of an arc tube. The longitudinal cross-sectional view of the left view which similarly shows a lightbulb-type fluorescent lamp. Similarly, the arc tube of the light bulb shaped fluorescent lamp is shown, (a) is a front view, (b) is a diagram showing the relationship between the globe and the arc tube as viewed from below. The graph which measured the ultraviolet output of the arc tube similarly. The graph which shows the transmittance | permeability of the light with respect to the wavelength of a resin globe similarly, (a) is a graph which shows a total light transmittance, (b) is a graph which shows a linear transmittance. Similarly, a graph showing the UV output of a bulb-type fluorescent lamp. Similarly, the graph shows the spectral distribution intensity of various lamps against wavelength and the relative visual sensitivity of insects as relative intensity. Explanatory drawing which cuts and shows the lighting fixture which similarly used the lightbulb-type fluorescent lamp. The front view which shows the conventional bulb-type fluorescent lamp by cross-sectioning the globe.

Explanation of symbols

L1: Bulb-type fluorescent lamp 1: Base 2: Cover 4: Arc tube 4d: Bulb 4q, 4r: Electrode 4l: Inner wall surface 4m: Phosphor layer 4n: Ultraviolet absorbing film 5: Lighting device 6: Globe 6c: Maximum diameter portion 6d: Open end 6e: Reduced diameter portion 6g: Top end 20: Lighting fixture 21: Appliance body 22: Socket

Claims (3)

A cover with a base at one end;
An arc tube comprising a bulb having a pair of electrodes and an ultraviolet absorbing film provided between the inner wall surface and the phosphor layer;
A globe composed of a translucent synthetic resin to which an ultraviolet absorber is added;
A lighting device housed in the cover;
A bulb-type fluorescent lamp characterized by comprising: An opening end formed on the base end side is attached to the cover, and has a maximum diameter portion on the top end side and a reduced diameter portion reduced in diameter from the maximum diameter portion on the base end side;
An arc tube formed to have a larger diameter than the inner diameter of the reduced diameter portion of the globe;
The bulb-type fluorescent lamp according to claim 1, comprising: An instrument body provided with a socket;
The bulb-type fluorescent lamp according to claim 1 or 2 mounted in a socket of the instrument body;
The lighting fixture characterized by comprising.

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