JP2006100107A - Fluorescent lamp - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fluorescent lamp in which a stable action is possible without giving an adverse effect to a phosphor layer of a light emitting tube, and which has a layer (ultraviolet ray transmission suppressing layer) to suppress transmission of light of a wavelength 400 nm or less. <P>SOLUTION: The fluorescent lamp 1 is equipped with the light emitting tube 4 in which the phosphor is applied on the inner face, a driving circuit 5 of the light emitting tube 4, and a holder 6 to fix the light emitting tube 4 and a driving circuit 5. The light emitting tube 4 is covered by a globe glass 7. The layer (ultraviolet ray transmission suppressing layer) 8 to suppress transmission of the light of the wavelength 400 nm or less is installed at least at one of the inner surface and the outer surface of this globe glass 7. The ultraviolet transmission suppressing layer 8, for example includes that which is mixed with at least one kind of antimony trioxide, aluminum oxide, silicon oxide, and zinc oxide in addition to titanium oxide. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a fluorescent lamp, and more particularly, to a fluorescent lamp having a layer that suppresses transmission of ultraviolet rays emitted from an arc tube of the fluorescent lamp.

Ultraviolet rays emitted from the fluorescent tube of fluorescent lamps cause discoloration and deterioration of, for example, fixtures and furniture, and attract insects with visual sensitivity to light below 400 nm. A so-called UV-free fluorescent lamp having a function to suppress has been proposed. This UV-free fluorescent lamp is obtained by, for example, applying a material that suppresses transmission of light having a wavelength of 400 nm or less, such as titanium oxide or cerium oxide, between a phosphor layer on the inner surface of an arc tube and a glass tube. This type of fluorescent lamp is described in, for example, Japanese Patent Laid-Open No. 8-102295.
JP-A-8-102295

  In the conventional technology for applying a substance that suppresses transmission of light having a wavelength of 400 nm or less to a fluorescent lamp, after applying a substance that suppresses transmission of light having a wavelength of 400 nm or less to the inner surface of the glass bulb of the arc tube, a phosphor is formed thereon. It was necessary to apply. However, since the layer of the substance that suppresses transmission of light having a wavelength of 400 nm or less applied here is thick, it is difficult to process the glass tube in the tube bending process of the arc tube, and the phosphor layer is likely to be peeled off. It was. Further, since the layer of the substance that suppresses the transmission of light having a wavelength of 400 nm or less is thick, the impure gas cannot be exhausted sufficiently outside the arc tube in the arc tube manufacturing process, and the starting voltage of the arc tube increases due to the remaining impure gas. There was a problem that could lead to lighting.

  Accordingly, an object of the present invention is to provide a fluorescent lamp having a layer (ultraviolet transmission inhibiting layer) that inhibits the transmission of light having a wavelength of 400 nm or less and can operate stably without adversely affecting the phosphor layer of the arc tube. There is to do.

  The present invention intends to solve the above problem by providing an ultraviolet light transmission inhibiting layer not on the inside of the arc tube but on the outside in the fluorescent lamp.

  That is, the above object is a fluorescent lamp comprising an arc tube with a phosphor coated on the inner surface, a circuit for driving the arc tube, and a holder for fixing the arc tube and the drive circuit. This is achieved by a fluorescent lamp provided with a globe glass that covers the surface of the globe glass and provided with a layer that suppresses transmission of light having a wavelength of 400 nm or less on at least one of the inner surface and the outer surface of the globe glass.

  Another object of the present invention is to provide a fluorescent lamp comprising an arc tube having an inner surface coated with a phosphor, a drive circuit for the arc tube, and a holder for fixing the arc tube and the drive circuit. This is achieved by a fluorescent lamp in which a layer for suppressing transmission of light having a wavelength of 400 nm or less is provided on the outer surface.

  Here, the layer that suppresses transmission of light having a wavelength of 400 nm or less may include a mixture of at least one of antimony trioxide, aluminum oxide, silicon oxide, and zinc oxide in addition to titanium oxide.

  According to the present invention, there is provided a fluorescent lamp having a layer (ultraviolet transmission inhibiting layer) that inhibits the transmission of light having a wavelength of 400 nm or less and that can stably operate without adversely affecting the phosphor layer of the arc tube. be able to. That is, in the present invention, without changing the arc tube manufacturing process, the emission from the fluorescent lamp is the same as when a substance having a simple structure and suppressing the transmission of light having a wavelength of 400 nm or less is applied to the inner surface of the arc tube. UV can be suppressed. Thereby, it is possible to reduce fading and deterioration of instruments and furniture caused by ultraviolet rays emitted from the fluorescent lamp, and it is possible to reduce the attraction of insects having visibility to light of 400 nm or less.

  Hereinafter, embodiments of the fluorescent lamp according to the present invention will be described with reference to the drawings taking a bulb-type fluorescent lamp as an example, but the present invention is not limited to the bulb-type fluorescent lamp.

  FIG. 1 is a view showing an embodiment of a light bulb-type fluorescent lamp according to the present invention. FIG. 1 (a) is a partially cutaway view of the lamp, and FIG. 1 (b) is an enlarged view of a portion A in FIG. As shown in FIG. 1 (a), a bulb-type fluorescent lamp 1 includes an arc tube comprising a resin cover 2, a base 3 fixed to the cover 2, and one or more U-shaped bent bulbs, for example. 4, a drive circuit 5 for the arc tube 4, a resin holder 6 for fixing the arc tube 4 and the drive circuit 5, and a globe glass 7 to which a light diffusion film is not applied. The arc tube 4 has electrodes at both ends, a discharge medium containing mercury and a rare gas is sealed inside, and a phosphor is coated on the inner surface. The arc tube 4 is covered with a globe glass 7.

  Among these components, as shown in FIG. 1B, the globe glass 7 has a layer (ultraviolet transmission suppression layer) 8 that suppresses transmission of light having a wavelength of 400 nm or less on the inner surface thereof. The ultraviolet light transmission inhibiting layer 8 includes, for example, a mixture of at least one of antimony trioxide, aluminum oxide, silicon oxide, and zinc oxide in addition to titanium oxide. The globe glass 7 may be coated with a light diffusion film in advance on its inner surface. Further, the ultraviolet light transmission inhibiting layer 8 may be formed on the outer surface of the globe glass 7. That is, the ultraviolet light transmission inhibiting layer 8 can be provided on at least one of the inner surface and the outer surface of the globe glass 7. Further, the ultraviolet light transmission inhibiting layer 8 formed on the inner surface or the outer surface of the globe glass 7 may be non-uniform.

  The effects of the ultraviolet light transmission inhibiting layer 8 in this example are as follows. That is, by forming the ultraviolet light transmission inhibiting layer 8 on at least one of the inner surface and the outer surface of the globe glass 7, the ultraviolet light transmission inhibiting layer 8 is formed on the inner surface of the arc tube with a simple structure without changing the arc tube manufacturing process. As in the case of forming, the transmission of ultraviolet rays emitted from the fluorescent lamp can be suppressed.

  FIG. 2 is a graph showing an example of each emission intensity curve of a bulb-type fluorescent lamp in which an ultraviolet transmission suppression layer according to the present invention is formed and a conventional bulb-type fluorescent lamp in which no ultraviolet transmission suppression layer is formed. In this figure, the horizontal axis indicates the wavelength (nm) of light emitted from the fluorescent lamp, and the vertical axis indicates the relative light emission intensity (arbitrary unit) of the fluorescent lamp. In FIG. 2, the light emission intensity curve 9 of the light bulb shaped fluorescent lamp having the ultraviolet light transmission inhibiting layer 8 according to the present invention is compared with the light emission intensity curve 10 of the conventional light bulb shaped fluorescent lamp without the ultraviolet light transmission inhibiting layer. The bulb-type fluorescent lamp according to the present invention can reduce the ultraviolet rays emitted from the arc tube by about 80%. As a result, according to the present invention, fading and deterioration of appliances and furniture due to ultraviolet rays can be suppressed, and the induction of insects having a visibility curve 11 of 400 nm or less can be achieved with a light bulb in which the ultraviolet light transmission inhibiting layer 8 is not formed. This can be reduced to 0.4 to 0.5 times that when a fluorescent lamp is used.

  FIGS. 3A and 3B are diagrams showing another embodiment of the bulb-type fluorescent lamp according to the present invention, in which FIG. 3A is a partially cutaway view of the lamp, and FIG. 3B is an enlarged view of a portion A of FIG. As shown in FIG. 3 (a), the bulb-type fluorescent lamp 1 includes a resin cover 2, a base 3 fixed to the cover 2, and an arc tube 4 including one or more U-shaped bent bulbs. And a drive circuit 5 for the arc tube 4, a resin holder 6 for fixing the arc tube 4 and the drive circuit 5, and a globe glass 7 to which the light diffusion film is not applied. The arc tube 4 has electrodes at both ends, a discharge medium containing mercury and a rare gas is sealed inside, and a phosphor is coated on the inner surface. The arc tube 4 is covered with a globe glass 7.

  Among these components, as shown in FIG. 3B, the arc tube 4 has an ultraviolet light transmission inhibiting layer 8 formed on the outer surface thereof. In this case, the globe glass 7 may be coated with a light diffusion film on the inner surface. Further, the ultraviolet light transmission inhibiting layer 8 formed on the outer surface of the arc tube 4 may be non-uniform. In this embodiment, the ultraviolet light transmission inhibiting layer 8 is provided on the outer surface of the arc tube 4, and the globe glass 7 can be omitted to provide a globeless type fluorescent lamp.

  Also in this example, the emission intensity curve 9 of FIG. 2 can be obtained, and, as in the case of Example 1 above, with a simple structure, similarly to the case where the ultraviolet light transmission inhibiting layer 8 is formed on the inner surface of the arc tube. The transmission of ultraviolet rays emitted from the fluorescent lamp can be suppressed.

  The present invention relates to a fluorescent lamp, and more particularly to a fluorescent lamp having a layer that suppresses transmission of ultraviolet rays emitted from the arc tube of the fluorescent lamp, and has industrial applicability.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows one Example of the lightbulb-type fluorescent lamp which concerns on this invention, (a) is a partially notched figure of a lamp | ramp, (b) is an enlarged view of the A section of (a). It is a graph which shows an example of each light emission intensity curve of the bulb-type fluorescent lamp which formed the ultraviolet-ray transmission suppression layer which concerns on this invention, and the conventional bulb-type fluorescent lamp without an ultraviolet-ray transmission suppression layer. It is a figure which shows the other Example of the lightbulb-type fluorescent lamp which concerns on this invention, (a) is a partially notched figure of a lamp | ramp, (b) is an enlarged view of the A section of (a).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Light bulb-type fluorescent lamp 2 Resin cover 3 Base 4 Arc tube 5 Drive circuit 6 Holder 7 Globe glass 8 Ultraviolet light transmission suppression layer 9 Light emission intensity curve of light bulb-type fluorescent lamp according to the present invention 10 Light emission of a conventional light bulb-type fluorescent lamp Intensity Curve 11 Insect Visibility Curve

Claims (3)

  A fluorescent lamp comprising an arc tube with a phosphor coated on its inner surface, a drive circuit for the arc tube, and a holder for fixing the arc tube and the drive circuit, comprising a globe glass covering the arc tube A fluorescent lamp characterized in that a layer for suppressing the transmission of light having a wavelength of 400 nm or less is provided on at least one of the inner surface and the outer surface of the globe glass.   A fluorescent lamp comprising an arc tube having an inner surface coated with a phosphor, a drive circuit for the arc tube, and a holder for fixing the arc tube and the drive circuit, the outer surface of the arc tube having a wavelength of 400 nm A fluorescent lamp comprising a layer for suppressing the following light transmission:   2. The layer for suppressing transmission of light having a wavelength of 400 nm or less includes a mixture of at least one of antimony trioxide, aluminum oxide, silicon oxide, and zinc oxide in addition to titanium oxide. Or the fluorescent lamp of 2.

Images