EP2117031A1 - Lampe fluorescente de type compact - Google Patents

Lampe fluorescente de type compact Download PDF

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Publication number
EP2117031A1
EP2117031A1 EP08711981A EP08711981A EP2117031A1 EP 2117031 A1 EP2117031 A1 EP 2117031A1 EP 08711981 A EP08711981 A EP 08711981A EP 08711981 A EP08711981 A EP 08711981A EP 2117031 A1 EP2117031 A1 EP 2117031A1
Authority
EP
European Patent Office
Prior art keywords
tube
compact
shaped
fluorescent lamp
type fluorescent
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP08711981A
Other languages
German (de)
English (en)
Inventor
Masayuki Kiryu
Terutaka Muramatsu
Takashi Osawa
Ryo Suzuki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Osram GmbH
Original Assignee
Osram GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2007049082A external-priority patent/JP2008210759A/ja
Priority claimed from JP2007048672A external-priority patent/JP2008210744A/ja
Application filed by Osram GmbH filed Critical Osram GmbH
Publication of EP2117031A1 publication Critical patent/EP2117031A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/30—Vessels; Containers
    • H01J61/32—Special longitudinal shape, e.g. for advertising purposes
    • H01J61/327—"Compact"-lamps, i.e. lamps having a folded discharge path
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/30—Vessels; Containers
    • H01J61/33—Special shape of cross-section, e.g. for producing cool spot

Definitions

  • the present invention relates to a compact-type fluorescent lamp having eight or more tubes.
  • the lamp of 70 W and light flux of 5200 lm (lumens) has a length of 220 mm and this implies problems, e.g. it is not suitable for practical use in a narrow space. More specifically, in the case of a vertical embedded-type downlight, the height behind the ceiling is a problem. The problem being that, when the lamp exceeds 210 mm, the ceiling equipment designed for it cannot be installed, and 210 mm is considered to be the upper limit. Therefore, using eight tubes instead of six tubes and shortening the length has been studied (for example, see Patent Document 1).
  • the temperature tends to increase in a lamp using large electric power. Therefore, the temperature of the coldest point is increased, and the mercury vapor pressure rises beyond the optimum value for light emission.
  • a method of providing a mercury amalgam at an appropriate position of a lamp is used.
  • An eight-tube compact-type fluorescent lamp has the tendency that the temperature of the lamp is above that of a six-tube lamp. This is due to the fact that the volume density of the eight luminous tubes is above that of six tubes.
  • the base is made of a resin, there is the problem that the resin deteriorates when the temperature is increased.
  • the biggest problem regarding the use of liquid mercury is that the temperature of the coldest part increases beyond the optimum value. This can be conceivably solved by arranging the structure of the coldest part so that the temperature is not readily increased. However, the temperature is further increased when lighted in lighting equipment, and thereby increased beyond the optimal value for mercury vapor pressure. This is much higher than the increase of the mercury vapor pressure caused alongside the temperature increase of the mercury amalgam. The problem lies in not largely reducing the efficiency in accordance to the temperature increase within lighting equipment.
  • the present invention has been accomplished to solve the problems above described, and it is an object of the present invention to create a part that serves as a coldest point, with a temperature around 50°C upon lighting in a compact-type fluorescent lamp having eight or more tubes using liquid mercury and to provide the compact-type fluorescent lamp capable of reducing the temperature near the base.
  • the present invention has been accomplished for solving the above described problems, and it is an object of the present invention to provide a compact-type fluorescent lamp of eight or more tubes using liquid mercury capable of obtaining total light flux which is even sufficient in lighting equipment.
  • the cross section of the vertex portion of at least one of the U-shaped tubes has a shape in which a wide portion is near the diverging portion of the U-shaped tube, and the shape is tapered from the wide portion toward the distal end portion of the vertex portion.
  • a tube axial-direction inner size L1 of the vertex portion meets the expression
  • 11 ⁇ L ⁇ 1 ⁇ 17 unit is mm
  • a tube axial-direction size L2 from the wide portion near the diverging portion of the U-shaped tube to the distal end portion of the vertex portion meets the expression
  • L ⁇ 1 - 7 ⁇ L ⁇ 2 ⁇ L ⁇ 1 - 2 unit is mm
  • the compact-type fluorescent lamp according to the present invention is characterized in that the lengths of all the U-shaped tubes in the tube axial direction are approximately the same.
  • the compact-type fluorescent lamp according to the present invention is characterized in that the positions of the diverging portions of all the U-shaped tubes are approximately the same.
  • the compact-type fluorescent lamp according to the present invention is characterized in that the shapes of the opposing U-shaped tubes are identical.
  • a compact-type fluorescent lamp according to the present invention in which a luminous tube composed of U-shaped tubes comprises eight or more tubes and liquid mercury is sealed within, is characterized in that when the distance between the filament and the base line of a base is Lf, and the distance between the joint portion of the U-shaped tubes and the base line of the base is La, the expressions 11 ⁇ Lf ⁇ 17 unit is mm and Lf - 19 ⁇ La ⁇ Lf - 13 unit is mm are met.
  • a compact-type fluorescent lamp according to the present invention in which a luminous tube is composed of eight or more U-shaped tubes and the mercury vapor pressure is not regulated, is characterized in that the distance between bulbs of the U-shaped tube is Lb, and the distance Lc between the U-shaped tubes meet the expressions, 1.5 ⁇ Lb ⁇ 3 unit is mm and 1.5 ⁇ Lc ⁇ 3 unit is mm
  • a compact-type fluorescent lamp according to the present invention in which a luminous tube is composed of eight or more U-shaped tubes and the mercury vapor pressure is not regulated, is characterized in that a polyangular base case is provided, the base case has opening portions opposed to the apexes of the polyangular shape for holding the luminous tube, and the shortest distance between the apex of the polyangular shape of the base case and the opening portion and the distance p between a circumscribing circle of the base case and a middle point of one side of the polyangular shape meet the expressions, 3 ⁇ s ⁇ 6 unit is mm and 1 ⁇ p unit is mm
  • the vertex portion is formed to have a wedge-shaped cross section, and (1) and (2) are met.
  • the part that serves as the coldest point which is at about 50°C upon lighting can be created at the distal end portion of the luminous tube.
  • the opposing U-shaped tubes have the same shape. As a result, the light flux can be ensured.
  • the expressions (4) and (5) are met.
  • the discharge path is not shortened, the possibilities that the coldest point is changed from the U-shaped tube vertex portion to the base side and that an optimal coldest point temperature is not achieved can be eliminated and the temperature near the base can be reduced.
  • the distance Lb between the bulbs of the U-shaped tube and the distance Lc between the U-shaped tubes is kept narrow in order to inhibit excessive cooling.
  • the compact-type fluorescent lamp according to the present invention employs the mercury-introducing type in which the mercury vapor pressure is not regulated. Therefore, since it can handle excessive cooling, the distance Lb between the bulbs of the U-shaped tube and the distance Lc between the U-shaped tubes can be wider than normal. More specifically, as a result of meeting the expressions (11) and (12), when it is incorporated in lighting equipment, the convection flow around the lamp flows smoothly. This causes a smaller increase in temperature improved efficiency and the light, emitted inside the lamp, to be readily emitted to the outside, thus increasing the total light flux.
  • the shortest distance s between the apex point of the polyangular shape of the base case and the opening portion and the distance p between the circumscribing circle of the base case and the middle point of one side of the polyangular shape are arranged to meet the expressions (13) and (14).
  • FIGs. 1 to 6 are drawings showing a first embodiment; wherein FIG. 1 shows the entire configuration of a compact-type fluorescent lamp 1 ( FIG. 1A is a plan view, and FIG. 1B is a front view), FIG. 2 is a plan view of a base case, FIG. 3 is a partial vertical cross sectional view of a U-shaped tube 2, FIG. 4 is a cross sectional view of a U-shaped tube vertex portion 2a of the U-shaped tube 2, FIG. 5 shows a first modification example in which a U-shaped tube 20 and a U-shaped tube 21 having different shapes are combined, and FIG. 6 shows a second modification example in which the U-shaped tube 20 and a U-shaped tube 22, having different shapes, are combined.
  • the compact-type fluorescent lamp 1 has a luminous tube 5 in which four U-shaped tubes 2 (glass bulbs) are fused mutually at the side walls at end portions (joint portions 2a) to form one meander-shaped discharge path inside by the eight glass bulbs, a base case 3 having a flat portion 3b to which the luminous tube 5 is fixed by bonding or the like, a side wall 3a which is continuous to the flat portion 3b and has an octagonal transverse cross section and a base 4, which is fitted in the base case 3, and has the base pins 4a electrically connected to lead wires from the luminous tube 5.
  • U-shaped tubes 2 glass bulbs
  • filaments are provided although they are not shown.
  • An electron emission substance is applied to the filaments.
  • the discharge path is formed between the two filaments.
  • the material of the base case 3 is, for example, PET (polyethylene terephthalate), LCP (liquid crystal polymer), or PBT (polybutylene terephthalate).
  • the other end portion of the side wall 3a is opened, and the base 4 having the base pins 4a is fitted therein.
  • the compact-type fluorescent lamp 1 of FIG. 1 is of the type which does not use an amalgam and liquid mercury is introduced into the luminous tube.
  • the temperature of the lamp does not increase, and remains in a state where the temperature is considerably below the optimal value for using the amalgam in some cases. This is referred to as excessive cooling.
  • the optimal value of the amalgam is high, time is taken after lighting until it reaches the optimum temperature, and the rise of the light flux is slow, which is a problem. This solves these problems.
  • the methods of introducing liquid mercury into the luminous tube include the following and refer to those in which mercury acts independently, at least during operation.
  • the mercury vapor pressure can also be changed by, other than the temperature of the amalgam, adjusting the ratio of the elements constituting the amalgam. Furthermore, the position of the amalgam can be fixed by fixing it to a chip tube or to a lead wire supporting the filament. This is called that “mercury vapor pressure regulation”.
  • the mercury vapor pressure is determined merely by the temperature of mercury remaining liquid during lighting. Since liquid mercury moves, it freely moves to a position where the temperature is lowest, and the position cannot be fixed. This is called “not regarding the mercury vapor pressure”.
  • the four U-shaped tubes 2 constituting the luminous tube 5 have the same shape.
  • the outer tube diameter of the U-shaped tube 2 is 10 to 15 mm, and the length L of the compact-type fluorescent lamp 1 (i.e. the distance between the root of the base pins 4a and the distal end of the luminous tube 5 (see FIG. 1 )) is 150 to 210 mm, and 180 mm is used as example.
  • the upper limit is set to 210 mm. Moreover, if it is too short, the light emission efficiency is reduced. Therefore, the lower limit is set to 150 mm.
  • the lower limit is set to 10 mm.
  • the upper limit is set to 15 mm.
  • the length of a 70 W six-tube compact-type fluorescent lamp is 220 mm; therefore, it is shortened by about 40 mm.
  • the temperature of the luminous tube 5 is higher than one of the same wattage composed of six tubes. In this example, the difference is about 5 K (kelvin).
  • the shape of the vertex portion of the U-shaped tube 2 which forms the coldest point at the vertex portion of the U-shaped tube 2 is studied.
  • the vertex portion of the U-shaped tube 2 also serves as a part of the discharge path.
  • the temperature of the discharge path is above that of the part which does not serve as discharge path. Therefore, for example, as shown in FIG. 4 , the cross sectional shape of the U-shaped tube vertex portion 2a is the shape in which a wide portion 2b is near the diverging portion of the U-shaped tube 2, and it is tapered from the wide portion 2b toward the distal end portion of the U-shaped tube vertex portion 2a.
  • the wide portion 2b, near the diverging portion of the U-shaped tube 2 serves as a discharge path.
  • the vicinity of the distal end does not serve as a discharge path. Therefore, the temperature in the vicinity of the diverging portion is below that of the wide portion 2b.
  • the shape of the U-shaped tube vertex portion 2a is shown by specific numerical values. As shown in FIG. 3 , a tube axial-direction inner size L1 of the U-shaped tube vertex portion 2a is 11 ⁇ L ⁇ 1 ⁇ 17 unit is mm
  • the U-shaped tube vertex portion 2a When the U-shaped tube vertex portion 2a has the above described shape, the vicinity of the wide portion 2b, near the diverging portion of the U-shaped tube 2, serves as the discharge path. The distal end portion of the U-shaped tube vertex portion 2a does not serve as the discharge path. Therefore, the temperature thereat is below that of the wide portion 2b near the diverging portion of the U-shaped tube 2, and the coldest point is formed there.
  • the ambient temperature is 25°C
  • the optimum coldest point temperature upon lighting is 50°C
  • the distal end portion of the U-shaped tube vertex portion 2a can be controlled regarding the temperature, by arranging the U-shaped tube vertex portion 2a to have above described shape.
  • the eight-tube compact-type fluorescent lamp 1 has the four U-shaped tubes 2. All the U-shaped tube 2 may have the shape that meets the expressions (1) to (3). However, some of the U-shaped tubes 2 may have the shape that satisfies the expressions (1) to (3). When one or two of the U-shaped tubes 2 meet the expressions (1) to (3), and the tube axial direction inner size L1 of the vertex portion of the other U-shaped tubes 2 is short, efficiency is improved.
  • modification examples thereof will be described.
  • the U-shaped tube 20 having the shape in which the vertex portion meets the expressions (1) to (3) and the U-shaped tubes 21 in which the tube axial-direction inner size L1 of the vertex portion is shorter than that of the U-shaped tube 20 are combined.
  • the length of the U-shaped tube 20 and the U-shaped tube 21 in the tube axial-direction is the same.
  • At least one of the four U-shaped tubes is the U-shaped tube 20, and the others are the U-shaped tube 21.
  • two of the four U-shaped tubes are the U-shaped tubes 20, it is preferred that the U-shaped tubes 20 oppose to each other. This shape is suitable when the compact-type fluorescent lamp 1 is used horizontally. This is because the temperature of the coldest point does not vary largely depending on the way the compact-type fluorescent lamp 1. is attached
  • the compact-type fluorescent lamp 1 using one U-shaped tube 20 and the U-shaped tubes 21 for the other three tubes is the most preferred in terms of property.
  • the modification example shown in FIG. 6 is also a combination of the U-shaped tube 20, having the shape in which the vertex portion meets the expressions (1) to (3), and the U-shaped tube 22, in which the tube axial-direction inner size L1 of the vertex portion is shorter than that of the U-shaped tube 20.
  • the points different from FIG. 5 are that the lengths of the U-shaped tube 20 and the U-shaped tube 22 in the tube axial direction are different and that the position of the diverging portion of the U-shaped tube 20 is approximately the same.
  • at least one of the four U-shaped tubes is the U-shaped tube 20, and the others are the U-shaped tubes 22.
  • the U-shaped tubes 20 When two of the four U-shaped tubes are the U-shaped tubes 20, it is preferred that the U-shaped tubes 20 oppose each other. This shape is suitable when the compact-type fluorescent lamp 1 is used horizontally. This is because the temperature of the coldest point is not varied depending on the way of attaching the compact-type fluorescent lamp 1.
  • FIG. 7 shows a second embodiment and is a drawing showing the vicinity of a base line of the base of the compact-type fluorescent lamp 1.
  • the temperature of the luminous tube 5 is above that of a tube of the same wattage and composed of six tubes. Therefore, the temperature of the base 4 is also increased.
  • the material of the base case 3 is PET or the like. Therefore, it may deteriorate when the temperature of the base 4 is increased. Therefore, in the present embodiment, reducing the temperature of the base 4 is studied.
  • the part relating to the temperature of the base 4 is the filament 6 ( FIG. 7 ) and the joint portion 2c ( FIG. 7 ) between the U-shaped tubes 2. Both temperatures at the filament 6, serving as an origin point of discharge, and the joint portion 2c between the U-shaped tubes 2, serving as the discharge path, are high. In order to reduce the temperature of the base 4, keeping the filament 6 and the joint portion 2c between the U-shaped tubes 2 away from the base 4 is effective. However, when they are too far away, the efficiency may deteriorate since the length of the entire discharge path is shortened, the coldest point may be changed from the U-shaped tube vertex portion 2a to the base 4 side, and the optimal coldest temperature may not be obtained. Therefore, naturally, there is a limit.
  • a first reason of providing the coldest point in the distal end side instead of the base side is that the temperature is readily lowered in the distal end side, and that the discharge path can be elongated as a whole when the coldest point is in the distal end side.
  • temperature variations are large in the base side, and the light fluxes are largely varied depending on the differences in the lighting equipment or the atmosphere.
  • a second reason is to reduce such variations.
  • Lf and La which reduce the temperature of the base 4, do not shorten the length of the discharge path, and have no possibility of changing the coldest point from the U-shaped tube vertex portion 2a to the base 4 side and not achieving the optimum coldest temperature, are 11 ⁇ Lf ⁇ 17 unit is mm Lf - 19 ⁇ La ⁇ Lf - 13 unit is mm
  • the distal end side is similar to that of the first embodiment.
  • the distal end side is similar to that of the first embodiment, under the conditions of the second embodiment, the coldest point is reliably provided in the distal end side, the conditions of the coldest point temperature in the distal end side become optimal, and the length of the discharge path is sufficiently elongated.
  • suitable conditions in which the distal end part is different from that of the first embodiment, are created, meeting the conditions of the second embodiment relating to the base side is effective.
  • FIGs. 8 to 10 show the third embodiment.
  • FIG. 8 shows the entire configuration of a compact-type fluorescent lamp 101
  • FIG. 9 is a plan view of a base case 103
  • FIG. 10 is a partial vertical cross sectional view of U-shaped tubes 102.
  • the compact-type fluorescent lamp 101 has a luminous tube 105 in which four U-shaped tubes 102 (glass bulbs) are mutually joined by fusion mutually at the side walls of the end portions (joint portions 102a) to form one meander-shaped discharge path inside the eight glass bulbs, a base case 103 having a flat portion 103b to which the luminous tube 105 is fixed by bonding or the like and a side wall 103a which is continuous to the flat portion 103b and has an octagonal transverse cross section, and a base 104 which is fitted in the base case 103 and has base pins 104a electrically connected to lead wires from the luminous tube 105.
  • filaments are provided, although they are not shown.
  • An electron emission substance is applied to the filaments.
  • the discharge path is formed between the two filaments.
  • the material of the base case 103 is, for example, PET (polyethylene terephthalate), LCP (liquid crystal polymer), or PBT (polybutylene terephthalate).
  • the base case 103 eight opening portions 103c for fixing the eight-tube luminous tube 105 onto the flat portion 103b, which is continued to one end portion of the side wall 103a, by bonding or the like are provided.
  • the other end portion of the side wall 103a is opened, and the base 104, having the base pins 104a, is fitted therein.
  • the compact-type fluorescent lamp 101 of FIG. 8 does not use an amalgam, and liquid mercury is introduced into the luminous tube 105.
  • the temperature of the lamp is not increased, and it remains in the state in which the temperature is considerably below the optimal value when using the amalgam, in some cases. This is referred to as excessive cooling.
  • the optimum value of the amalgam is high, it takes time after lighting until it reaches the optimal temperature, and the rise of light flux is slow, which is a problem. This solves these problems.
  • the methods of introducing liquid mercury into the luminous tube include the following and refer to those in which mercury acts independently, at least during operation.
  • the mercury vapor pressure can be also changed by, other than the temperature of the amalgam, adjusting the ratio of the elements constituting the amalgam. Furthermore, the position of the amalgam can be fixed by fixing it to a chip tube or to a lead wire supporting the filament. This is called “mercury vapor pressure regulation”.
  • the mercury vapor pressure is determined merely by the temperature of mercury remaining as liquid during lighting. Since liquid mercury moves, it freely moves to a position where the temperature is lowest, and the position cannot be fixed. This is called “not regulating the mercury vapor pressure regulation”.
  • the four U-shaped tubes 102 constituting the luminous tube 105 have the same shape.
  • the outer tube diameter of the U-shaped tube 102 is 10 to 15 mm, and the length (height of the U shape) is 150 to 210 mm, and 180 mm is used as example.
  • the upper limit is set to 210 mm. Moreover, if it is too short, the light emission efficiency is reduced. Therefore, the lower limit is set to 150 mm.
  • the lower limit of the outer tube diameter of the U-shaped tube 102 is set to 10 mm. Moreover, if the tube diameter of the U-shaped tube 102 is too thick, the size of the luminous tube 105 in the diameter direction is increased, and the design of equipment becomes difficult. Since the current is also increased too much, a problem regarding the cost of the inverter emerges. Therefore, the upper limit of the tube outer diameter of the U-shaped tube 102 is set to 15 mm.
  • the length of a conventional 70 W six-tube compact-type fluorescent lamp is 220 mm. Since the length of the four U-shaped tubes 102 constituting the luminous tube 105 of the present embodiment is 180 mm, it is shortened by about 40 mm when compared.
  • the temperature of the luminous tube 105 is higher than one of the same wattage composed of six tubes. In an example, the difference is about 5 K (kelvin).
  • the temperature of the luminous tube 5 is increased, the temperature of the coldest point that controls the vapor pressure of mercury is also increased. Therefore, the total light flux is reduced.
  • the cross section of the vertex portion of the glass tube is wedge-shaped so that the coldest portion is away from the discharge path as much as possible.
  • the temperature is further increased therefrom. Since the temperature increase is different depending on the type and design of the lighting equipment, a lamp in which temperature increase is small is generally required.
  • the focus lies on the distance between the bulbs of the U-shaped tube 102 and the distance between the U-shaped tubes 102.
  • the distance between the bulbs of the U-shaped tube 102 is Lb, and the distance between the U-shaped tubes 102 is Lc.
  • the luminous tube 105 is composed of eight tubes, and the liquid mercury method is used, the problem of efficiency reduction due to temperature increase when it is installed in lighting equipment is solved in the following way. Specifically, when the distance Lb between the bulbs of the U-shaped tube 102 and the distance Lc between the U-shaped tubes 102 are arranged to be 1.5 ⁇ Lb ⁇ 3 unit is mm and 1.5 ⁇ Lc ⁇ 3 unit is mm a high light emission light flux can be obtained.
  • FIG. 11 is a drawing showing a fourth embodiment, and it is a plan view of the base case 103.
  • the luminous tube 105 is enlarged.
  • the eight-tube compact-type fluorescent lamp 101 as shown in the third embodiment is used in lighting equipment, which usually employs a six-tube compact-type fluorescent lamp 101, the gap between the shade portion of the lighting equipment and the compact-type fluorescent lamp 101 is narrowed, the convection flow in the shade portion deteriorates, thereby increasing the temperature of the compact-type fluorescent lamp 101 and the total light flux is reduced, which is a problem.
  • FIG. 11 is a plan view of the base case 103, and the outer shape of the base case 103 is octagonal.
  • the opening portions 103c oppose the vertex of the octagonal shape. Note that, in the octagonal shape, the corners of the vertex portions are chamfered and rounded.
  • a circumscribing circle is presupposed, the parts in contact with the circle are defined to be apexes and the parts connecting adjacent apexes are defined as sides.
  • it is approximately octagonal, i.e. each of the sides is distinctly away from the circumscribing circle and in the inside, it is considered to be of an octagonal shape.
  • symbols are defined.
  • d diameter of bulb
  • D diameter of the circumscribing circle of base case 103
  • s distance between apex of the octagonal shape of base case 103 and the opening portion 103c p: distance between the circumscribing circle of the base case 103 and a middle point of one side of the octagonal shape
  • the size of the fluorescent tube 105 is determined by the diameter d of the bulb, the distance Lb between the bulbs of the U-shaped tube 102 and the distance Lc between the U-shaped tubes 102. Therefore, when the distance s between the apex of the octagonal shape of the base case 103 and the opening portion 103c and the distance p between the circumscribing circle of the base case 103 and the middle point of one side of the octagonal shape meet the expressions (13) and (14), the diameter of the base case 103 can be reduced.
  • the radial size of the base 104 can be reduced, the gap between the shade portion of the lighting equipment and the compact-type fluorescent lamp 101 is enlarged, thereby improving the convection flow in the shade portion and the temperature increase of the compact-type fluorescent lamp 101 can be suppressed, thereby increasing the total light flux.
  • the shape of the base case is a polyangular column in accordance with the arrangement of the bulbs, instead of a cylindrical column. The reason for this is that, in this case, the material of the base case can be reduced, there are advantages in terms of weight and cost, the appearance is slender, and it is preferred in terms of design.
  • the base is formed to be a polyangular column
  • the material reduction effect is small and it is not downsized to a degree where it looks slender.
  • the advantages are, for example, that the creation of injection molds of the material becomes easy and defects are reduced. Furthermore, it can be considered to be excellent in terms of design due to the smooth roundness. Therefore, the base having a cylindrical columnar shape has been studied. Meanwhile, the cross section of the face perpendicular to the axis near the base of the lighting equipment is not required to be polyangular in accordance with the base in most case, actually, it is circular in most cases.
  • the gap between the base case of the lamp and the cross section of the lighting equipment is focused on, and the cross sectional shape of the base case is polyangular. As a result, the gap is enlarged, and the convection flow is increased.
  • the radial size of the base 104 is reduced, the gap between the shade portion of the lighting equipment and the compact-type fluorescent lamp 101 is increased, thereby improving the convection flow in the shade portion, and the temperature increase of the compact-type fluorescent lamp 101 is suppressed, thereby increasing the total light flux.
  • the octagonal shape is shown as the outer shape of the base case 103; however, it may be an arbitrary polyangular shape.

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  • Vessels And Coating Films For Discharge Lamps (AREA)
EP08711981A 2007-02-28 2008-02-26 Lampe fluorescente de type compact Withdrawn EP2117031A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2007049082A JP2008210759A (ja) 2007-02-28 2007-02-28 コンパクト形蛍光ランプ
JP2007048672A JP2008210744A (ja) 2007-02-28 2007-02-28 コンパクト形蛍光ランプ
PCT/JP2008/053257 WO2008105394A1 (fr) 2007-02-28 2008-02-26 Lampe fluorescente de type compact

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EP2117031A1 true EP2117031A1 (fr) 2009-11-11

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EP08711981A Withdrawn EP2117031A1 (fr) 2007-02-28 2008-02-26 Lampe fluorescente de type compact

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EP (1) EP2117031A1 (fr)
WO (1) WO2008105394A1 (fr)

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