JP2008288081A - Fluorescent lamp and lighting system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fluorescent lamp capable of exerting a sufficient protective film action, and hardly causing trouble such as separation of a reflective film in heating and bending a glass bulb; and a lighting system using it. <P>SOLUTION: This fluorescent lamp FL includes: a gastight glass bulb 1; an electrode 6 arranged in the glass bulb 1; a protective film 2 which is formed on the whole radial circumference of the inner surface of the glass bulb 1, and in which the film thickness in a partial radial region 2a is set smaller than that in a remaining part region 2b; the reflective film 3 formed by mainly containing fine particles, arranged on the inner surface side of the partial region 2a of the protective film 2, and forming an aperture part 4 facing the remaining part region 2b; a phosphor layer 4 formed over the whole circumference of the glass bulb 1 including the aperture part 4 and the inner surface side of the reflective film 2; and a discharge medium filled in the glass bulb 1. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a fluorescent lamp provided with a reflective film and an illumination device using the same.

  A protective film was formed on the entire inner surface of the glass bulb, a reflective film was formed on the inner surface of the protective film over the entire circumference of the glass bulb, and a phosphor layer was formed on the inner surface of the protective film and the reflective film over the entire circumference of the glass bulb. Fluorescent lamps are known (see Patent Document 1). The reflective film is formed by binding a fine particle material mainly composed of calcium pyrophosphate or the like with a binder.

  In the fluorescent lamp described in Patent Document 1, the protective film is formed in a uniform film thickness over the entire circumference of the glass bulb. The reflective film is formed to a thickness of about 10 to 40 μm with plate-like fine particles as the main material.

  Thus, according to the fluorescent lamp described in Patent Document 1, the luminous flux radiated in the direction in which no reflective film is formed increases, so that the illuminance directly below can be increased.

  On the other hand, a reflective film is formed on the inner surface of the glass bulb excluding the aperture, a protective film is formed on the inner surface of the aperture, a phosphor layer is formed on the inner surface of the reflective film, and a fluorescent film is formed on the inner surface of the aperture. A fluorescent lamp for a printer that does not form a body layer is known (see claim 3 of Patent Document 2). In paragraphs 0045-0050 of Patent Document 2, by forming a protective film on the entire circumference of the glass bulb including the inner surface of the reflective film and the aperture, mercury ions are implanted and blackening occurs in the opening. It is stated that this is prevented.

JP 2007-026882 A Japanese Patent Laid-Open No. 08-045476

  However, in the case of the fluorescent lamp described in Patent Document 1, if the thickness of the protective film is increased in order to improve the luminous flux maintenance factor, the reflective film formed on the protective film softens the glass bulb by heating. There is a problem that peeling or cracking is likely to occur during the bending of the film.

  In the case of the fluorescent lamp described in Patent Document 2, since the protective film is formed on the inner surface of the reflective film, the visible light reflected by the reflective film is applied twice before and after reflection by the reflective film. Since the light is transmitted, the amount of attenuation of visible light generated at that time increases, and there is a problem that the effectiveness as a reflective film is lowered. In addition, when the protective film is formed only on the inner surface of the aperture portion as the configuration described in claim 3 of Patent Document 2, there is the following problem. That is, when a protective film is formed only in a partial region, it is not possible to obtain a sufficient effect as a protective film, and formation of a partial protective film is troublesome.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a fluorescent lamp that exhibits a sufficient protective film action and is less prone to problems such as peeling of a reflection film when a glass bulb is heated and bent, and an illumination device using the fluorescent lamp.

  The fluorescent lamp of the present invention includes a tubular glass bulb; an electrode disposed so as to cause discharge in the glass bulb; and a part of the radial direction formed over the entire circumference of the inner surface of the glass bulb. A protective film in which the film thickness in the region is smaller than the film thickness in the remaining region; and is formed on the inner surface side of a partial region of the protective film, mainly composed of fine particles, and forms a residual region opening in the protective film A reflecting film formed on the inner surface side of the remaining area of the protective film facing the opening and the inner surface side of the reflecting film; and a phosphor layer formed over the entire circumference of the glass bulb in the radial direction; enclosed in the glass bulb And a discharge medium that has been formed.

  The present invention allows the following aspects.

  [Protective Film] In the present invention, the main material constituting the protective film is not particularly limited because known materials can be adopted. For example, one or more kinds of fine particles selected from the group of aluminum oxide, silicon oxide, zinc oxide, titanium oxide, zirconium oxide, cerium oxide, and yttrium oxide can be mainly formed.

  In addition, the protective film is formed over substantially the entire circumference in the radial direction of the inner surface of the glass bulb, but a part where a reflective film described later is formed, that is, a partial area in the radial direction of the protective film and a partial area in the radial direction. The film thickness is different from the remaining area excluding. The general film thickness ranges from 0.01 to 0.3 [mu] m, preferably 0.1 to 0.2 [mu] m in a partial region, and from 0.3 to 2 [mu] m in the remaining region. It is 0 μm, preferably 0.6 to 1.0 μm. In addition, the film thickness of a protective film shall mean the film thickness of the center part in the radial direction of each area | region in the center part of the tube axis direction of a glass bulb.

  In some areas, if the film thickness is less than 0.01 μm, it is difficult to form a protective film, and if the film thickness exceeds 0.3 μm, the reflective film formed on the inner surface side of the partial area may be peeled off. Problems such as cracks are likely to occur. In the remaining region, when the film thickness is less than 0.3 μm, the protective film function is insufficient and the luminous flux maintenance factor characteristic of the fluorescent lamp is deteriorated. When the film thickness exceeds 2.0 μm, the glass bulb is bent. The protective film is easily peeled off or cracked. In addition, although the upper limit value of the film thickness of a part area | region and the lower limit value of the film thickness of a remaining part area | region overlap, selection of such an overlapping film thickness is excluded.

  The means for making the partial film thickness and the remaining film thickness of the protective film different is not particularly limited in the present invention. For example, the protective film coating liquid is allowed to flow down to the glass bulb, the protective film coating liquid is applied to the entire circumference in the radial direction of the inner surface, and then the glass bulb is held obliquely to dry the protective film coating liquid. Thereby, while the film thickness of the protective film of the upper half part of a glass bulb becomes small (thin), the film thickness of a lower half part becomes large (thick). Further, by adding a large amount (for example, more than 3% by mass, preferably 4 to 6% by mass) of a binder such as fine particles of barium / calcium borate constituting the reflection film described later, the film thickness of the protective film is increased. A part of the direction is buried in the glass bulb during heating, and the thickness of the protective film adjacent to the reflective film becomes thin. It is presumed that this phenomenon promotes the above-mentioned burying action by diffusing barium / calcium borate in the reflective film into the protective film and destroying the network structure of the glass.

  [Reflective film] The reflective film is mainly composed of reflective fine particles, is formed by adding an appropriate amount of a binder such as barium / calcium borate, and is disposed on the inner surface side of a partial region of the protective film. Yes. The material of the reflective fine particles is not particularly limited in the present invention. Various known reflective fine particles can be appropriately selected and employed. For example, calcium pyrophosphate, strontium pyrophosphate, titanium oxide and phosphor can be used.

As the phosphor, a phosphor having an excitation spectrum in the near ultraviolet region is used. As this type of phosphor, for example, BaMg ₂ Al ₁₆ O ₂₇ : Eu, (Sr, Ca, Ba) ₅ (PO ₄ ) ₃ Cl: Eu, and the like can be appropriately selected. Compared with a fluorescent lamp having a reflective film that does not use a fluorescent material, a light beam emitted from the opening of the fluorescent lamp to the outside by using the fluorescent material for a part or all of the reflective fine particles constituting the reflective film. Increases, so that the illuminance directly below can be increased. Further, the total luminous flux is almost the same as that of a fluorescent lamp not provided with a reflective film. However, since this type of phosphor is generally expensive, the phosphor is used as part of the fine particles that form the reflective film, or the coating amount is reduced to reduce the film thickness of the reflective film so that the illuminance and total luminous flux directly below It is preferable from the viewpoint of economy that the thickness of the reflective film is equal to or slightly increased in the reflective film not using the phosphor.

  The thickness of the reflective film is not particularly limited in the present invention, but is generally 10 to 60 μm, preferably 30 to 50 μm. If the reflective film is less than 10 μm, a sufficient reflecting effect cannot be obtained. On the other hand, when the reflective film exceeds 60 μm, peeling or cracking is likely to occur when the glass bulb is heated and bent.

  Further, in the present invention, the average particle diameter of the reflective fine particles is not particularly limited in the present invention. For example, fine particles having an average particle diameter of about 2 to 10 μm can be used.

  Furthermore, the formation region of the reflective film is not particularly limited in the present invention. For example, as a fluorescent lamp for general illumination, about half of the radial direction of the inner surface of the glass bulb, that is, about 180 ° is effective. However, in other applications, it can be formed in an angle range suitable for the application. And the area | region of the glass bulb | bulb in which a reflecting film is not formed becomes an aperture part.

[Regarding Glass Bulb] The material of the glass bulb is not particularly limited in the present invention. For example, it can be formed using lead-free glass or soda-lime glass. As the lead-free glass, it is preferable to use a glass having the following composition. That is, both _Na 2 _O1~13% by mass% (preferably _{1%), K 2 O1~10%, Li} 2 O0~3% ( provided that _the total of Na 2 O, _{K 2} O and Li ₂ O 5 to 20%), Sb ₂ O ₃ 0.1 to 0.5%, substantially free of lead and having a softening temperature of 685 ° C. or lower.

  Further, the glass bulb can be bent into various shapes such as an annular shape, a polygonal shape, and a U-shape, for example, while being heated and softened.

  [Electrode] The electrode may be any electrode of any known various types such as a hot-cathode type and a cold-cathode type as long as it is disposed so as to cause discharge inside the glass bulb.

  [About Phosphor Layer] The phosphor layer is formed over the entire circumference of the glass bulb so as to cover the reflective film and the inner surface side of the protective film formed in the aperture portion where the reflective film is not formed. . In the present invention, the type of phosphor used for the phosphor layer is not particularly limited. For example, a three-wavelength light emitting phosphor can be used.

  [Regarding Discharge Medium] The discharge medium may adopt a known structure as a fluorescent lamp. For example, mercury and a rare gas (for example, one or more of Ne, Ar, Kr, and Xe), the rare gas alone, and the like can be used. Mercury may be pure mercury or amalgam.

  [About Lighting Device] The lighting device includes the fluorescent lamp described above and a lighting device for lighting the fluorescent lamp, and includes all devices for using the light emission of the fluorescent lamp for some purpose. A lamp is disposed in the lighting device body. Further, the lighting device may be either of an aspect disposed in the lighting device body and an aspect disposed away from the lighting device body. The lighting device main body refers to the remaining part excluding the fluorescent lamp and the lighting device from the lighting device.

  According to the present invention, the protective film is formed over the entire circumference in the radial direction of the inner surface of the glass bulb, and the film thickness of a partial region of the protective film that is a part where the reflective film is formed Although it is formed smaller than the film thickness of the remaining area, the reflective film also acts as a protective film. Therefore, even if the protective film has a different film thickness depending on the area, it is desired over the entire circumference of the glass bulb in the radial direction. It is possible to provide a fluorescent lamp that can exhibit a protective film action and that hardly causes peeling or cracking of the reflective film even when the glass bulb is heated and softened to bend, and an illumination device using the fluorescent lamp.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

  1 to 3 show a first embodiment for carrying out the fluorescent lamp of the present invention, FIG. 1 is a transverse sectional view, FIG. 2 is an electron micrograph in a partial region of the protective film, and FIG. It is an electron micrograph in the remaining region. In this embodiment, the fluorescent lamp FL includes a glass bulb 1, a protective film 2, a reflective film 3, an aperture portion 4, a phosphor layer 5, an electrode 6, and a discharge medium.

  The glass bulb 1 is formed using lead-free glass, for example, using a straight pipe having a tube diameter of 29 mm, and after sealing after forming a protective film 2, a reflective film 3, an aperture portion 4, and a phosphor layer 5 which will be described later. It is softened by heating and bent into a ring shape.

  The protective film 2 is formed over the entire circumference of the inner surface of the glass bulb 1, but a partial region 2 a that faces a reflective film, which will be described later, has a film thickness of 0.2 μm and faces the aperture portion 4 as shown in FIG. 2. The remaining area 2b is 0.6 μm as shown in FIG.

  In order to form the protective film 2, the following means was adopted. That is, an about 3 mass% colloidal solution prepared by dispersing ultrafine particles of silicon oxide having an average particle diameter of 25 nm in water is prepared. Next, the colloidal liquid is caused to flow down from the upper opening end of the glass bulb 1 to flow coat the protective film 2 on the inner surface of the glass bulb 1. When drying the protective film 2, the glass bulb 1 is held at an angle of about 60 °, and warm air is sent from the upper opening end. As a result, the film thickness of the upper half, that is, the partial region 2a is reduced, and the film thickness of the lower half, that is, the remaining region 2b is increased.

  The reflective film 3 is formed by applying strontium pyrophosphate fine particles having an average particle diameter of 5 μm to a position facing the partial region 2 a of the protective film 2, baking it after drying, and has a film thickness of 40 μm.

  The aperture 4 is formed in the remaining region 2b of the protective film 2 where the reflective film 3 of the glass bulb 1 is not formed.

  The phosphor layer 5 is coated on the inner surface of the protective film of the reflecting film 3 and the aperture 4 over the entire circumference of the glass bulb 1 with a three-wavelength light emitting rare earth phosphor, fired after drying, and has a thickness of 20 μm. ing.

  The electrode 6 is a hot-cathode electrode having a double coil structure, and a pair thereof is sealed inside the both ends of the glass bulb 1.

  The discharge medium is made of an appropriate amount of pure mercury and several hundreds of Pa of argon, and is enclosed in the glass bulb 1.

  FIG. 4 shows the external appearance evaluation result of the fluorescent lamp in the present invention when the thickness of the protective film on the reflective film side, that is, a partial region, and the thickness of the opening (aperture portion) side, that is, the remaining region are changed. It is a table. The test lamp is an FCL30 fluorescent lamp. The evaluation is based on visual observation. ○ indicates that there is no problem with no large peeling on the reflective film side and no large crack, △ indicates that the reflective film side is somewhat peeled or cracked, and × indicates that the reflective film side is peeled off or cracked. It is very conspicuous.

  As can be understood from FIG. 4, when the film thickness on the reflective film side, that is, in a partial region is 0.3 μm or less, the film thickness on the opening (aperture portion) side, that is, the remaining region, has an appearance at the evaluation point in the table. It was generally good. However, when the film thickness on the reflective film side is 0.4 μm or more, peeling on the reflective film side is likely to occur, and there is a problem that the appearance is hindered.

  FIG. 5 is a table showing the appearance evaluation results of the fluorescent lamp in the comparative example when the thickness of the protective film on the reflective film side, that is, in the partial region, and the thickness of the opening side, that is, in the remaining region are changed. In the comparative example, the thickness of the protective film is uniformly formed over the entire circumference in the radial direction of the inner surface of the glass bulb. The other conditions of the test lamp are the same as in FIG.

  As can be understood from FIG. 5, the comparative example has no appearance problem as long as the protective film has a thickness of 0.3 μm or less. However, the protective film is too thin to obtain the required protective film action as will be described later.

  FIG. 6 is a table showing the luminous flux maintenance factor after 6000 hours of lighting when the thickness of the protective film on the reflective film side, that is, a partial region and the thickness of the opening side, that is, the remaining region are changed. is there. In the table, the numerical value in the column at the intersection of the reflective film-side protective film thickness and the aperture-side protective film thickness indicates the luminous flux maintenance factor (%).

  As can be understood from FIG. 6, if the film thickness on the opening side, that is, the remaining region is 0.3 μm or more, and the film thickness on the reflection film side, that is, a partial region is 0.3 μm or less, the luminous flux maintenance factor is 86. In addition, the larger the aperture side, that is, the remaining film thickness, the better the luminous flux maintenance factor.

  Therefore, when the results of FIG. 4 and FIG. 6 are combined, the film thickness in the opening side, that is, the remaining region is 0.3 μm or more, and the film thickness in the reflection film side, that is, in the partial region is 0.3 μm or less. If the film thickness of the latter is smaller, it can be seen that there is no practical problem in appearance and luminous flux maintenance factor.

  FIG. 7 shows a luminous flux maintenance factor after 6000 hours of lighting when the thickness of the protective film on the reflective film side, that is, in a partial region, and the thickness of the opening (aperture portion) side, that is, the remaining region is changed. It is a table | surface which shows. The way of reading the table is the same as in Table 6.

  As can be understood from FIG. 7, the comparative example has a problem that when the thickness of the protective film is less than 0.3 μm, the luminous flux maintenance factor is less than 86%.

  Next, the 2nd form for implementing the fluorescent lamp of this invention is demonstrated. In this embodiment, the reflective film is formed using a phosphor having an excitation spectrum in the near ultraviolet region.

  FIG. 8 is a table showing the coating amount of the reflecting film, the illuminance directly below, and the total luminous flux in Examples 1 to 3 according to the second mode of the present invention in comparison with those in Comparative Examples 1 and 2. The illuminance directly below and the total luminous flux are relative values (%) when the data of Comparative Example 1 is 100%.

  As can be seen from FIG. 8, when the reflective film shown in Comparative Example 2 is composed of fine particles of strontium pyrophosphate, the illuminance immediately below increases by 30% compared to a fluorescent lamp not provided with a reflective film. The total luminous flux is several percent lower than that of Comparative Example 1. The fine particles of strontium pyrophosphate have a rod shape.

On the other hand, Example 1 is a case where the used phosphor is (Sr, Ca, Ba) ₅ (PO ₄ ) ₃ Cl: Eu 100%, the illuminance directly below is the same as that of Comparative Example 2, and the total luminous flux is It is almost the same as Comparative Example 1. Moreover, the coating amount is 25% less than that of Comparative Example 2. Note that (Sr, Ca, Ba) ₅ (PO ₄ ) ₃ Cl: Eu has a substantially spherical particle shape.

In Example 2, the phosphor used is BaMg ₂ Al ₁₆ O ₂₇ : Eu, the illuminance directly below is equal to or greater than that of Comparative Example 2, and the total luminous flux is equal to or greater than that of Comparative Example 1. Moreover, the coating amount is 25% less than that of Comparative Example 2. _{Incidentally, BaMg 2 Al 16 O 27:} Eu the particle shape is a substantially spherical.

  Further, in Example 3, the phosphor used was a mixture of 50% of Examples 1 and 2, the illuminance directly below is equivalent to Comparative Example 2, and the total luminous flux is almost equivalent to Comparative Example 1. Moreover, the coating amount is about 17% less than that of Comparative Example 2.

  FIG. 9 is a partial cross-sectional view of a ceiling-suspended lighting fixture as an embodiment for implementing the lighting device of the present invention. The lighting device LM includes a lighting device body 11, a fluorescent lamp FL, and a lighting device 12.

  The illuminating device main body 11 includes a base 11a, a lamp holder 11b, a lamp socket 11c, and a lower surface cover 11d as main components. The base body 11a includes an accommodation recess 11a1 in the upper part and a side plate part 11a2 in the lower part. The lamp holder 11b is disposed inside the base body 11a, and supports the fluorescent lamp FL in a detachable manner at a predetermined position in the illuminating device body 11. The lamp socket 11 c is connected to the wiring led out from the lighting device 12 and is arranged in the lighting device main body 11. The lower surface cover 11d is made of a translucent plate and closes the lower surface opening of the base body 11a.

  The fluorescent lamp FL is the fluorescent lamp of the present invention shown in FIG. 1 and is an annular fluorescent lamp. And it is supported by the lamp holder 11b in the inside of the illuminating device main body 11, and the lamp socket 11c is connected to the nozzle | cap | die B.

  The lighting device 12 is a circuit means for lighting the fluorescent lamp FL, and is attached to the interior of the housing inner portion 1a1 of the lighting device body 11.

The cross-sectional view which shows the 1st form for implementing the fluorescent lamp of this invention Similarly, an electron micrograph of a part of the protective film Similarly, an electron micrograph in the remaining region of the protective film In the present invention, a table showing the external appearance evaluation result of the fluorescent lamp when the thickness of the protective film on the reflective film side, that is, in the partial area, and the film thickness on the opening side, that is, in the remaining area is changed. Table showing the external appearance evaluation result of the fluorescent lamp when the thickness of the protective film on the reflective film side, that is, in the partial region, and the thickness of the opening side, that is, the remaining region, is changed in the comparative example. In the present invention, a table showing the luminous flux maintenance factor after 6000 hours of lighting when the thickness of the protective film on the reflective film side, that is, a partial region, and the thickness of the opening side, that is, the remaining region are changed. In the comparative example, a table showing the luminous flux maintenance factor after 6000 hours of lighting when the thickness of the protective film on the reflective film side, that is, in the partial region and the film thickness on the opening side, that is, the remaining region are changed. The table | surface which shows the coating amount of a reflecting film of Examples 1-3 in the 2nd form of this invention, direct illuminance, and the total light beam in contrast with that of Comparative Examples 1 and 2. The partial cross section figure of the ceiling hanging type lighting fixture as one form for implementing the illuminating device of this invention

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Glass bulb, 2 ... Protective film, 2a ... Partial area | region, 2b ... Remaining part area | region, 3 ... Reflective film, 4 ... Opening part, 5 ... Phosphor layer, 6 ... Electrode

Claims (4)

A tubular glass bulb;
An electrode disposed in the glass bulb so that a discharge occurs;
A protective film formed over the entire circumference in the radial direction of the inner surface of the glass bulb and having a thickness in a partial region in the radial direction smaller than that in the remaining region;
A reflective film composed mainly of fine particles and disposed on the inner surface side of a partial region of the protective film, forming a residual region opening of the protective film;
A phosphor layer formed over the entire circumference in the radial direction of the glass bulb on the inner surface side of the remaining region of the protective film facing the opening and the inner surface side of the reflective film;
A discharge medium enclosed in a glass bulb;
A fluorescent lamp characterized by comprising:   2. The fluorescent lamp according to claim 1, wherein the protective film has a film thickness in a partial region of 0.01 to 0.3 μm and a film thickness of a remaining region of 0.3 to 2.0 μm.   The fluorescent lamp according to claim 1, wherein the reflective film includes phosphor particles having an excitation spectrum in the near ultraviolet region. A lighting device body;
The fluorescent lamp according to claim 1, wherein the fluorescent lamp is disposed in a lighting device body;
A lighting circuit for lighting a fluorescent lamp;
An illumination device comprising:

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