JP2010129218A - Luminaire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a luminaire, capable of improving the appearance of a glove by eliminating a difference in luminance in between a fluorescent lamp-projected part and a peripheral part in the glove. <P>SOLUTION: The distance L between the glove 13 and the fluorescent lamp 20 is gradually increased toward an outermost part 201 of the lamp 20. According to this, since the luminance of the fluorescent lamp 20 projected to the glove 13 is gradually reduced, the difference in luminance between the peripheral part 131 of the glove 13 without projection of the fluorescent lamp 20 and the part 132 to which the fluorescent lamp 20 is projected can be reduced. Consequently, decrease of light in the peripheral part 131 of the luminaire 10 can be prevented to improve the appearance of the glove 13 in lighting. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a luminaire using a fluorescent lamp having an arc tube that swirls around a central portion of the tube and rises toward the central portion of the tube.

Conventionally, there has been proposed a lighting fixture using a fluorescent lamp having an arc tube swirled around a central portion of the tube (see, for example, Patent Document 1).
As shown in FIG. 5, a lighting fixture 100 described in Patent Literature 1 includes a fixture main body 101 formed in a box shape, a lighting device 102 and a power supply connection (not shown) housed in the fixture main body 101. The fluorescent lamp 104 is mounted on a flat reflecting surface 103 formed on the outer surface of the instrument main body 101, and the globe 105 covers the fluorescent lamp 104 and the instrument main body 101.
Then, the lighting device 102 and the power supply connecting portion are arranged in a region that substantially matches the projection surface of the fluorescent lamp 104 that is formed on the reflection surface 103 of the instrument main body 101.

Thereby, while ensuring the lighting fixture 100 whole compactly, ensuring of sufficient brightness is produced, without producing uneven brightness.
Japanese Patent Laid-Open No. 2008-204736 (FIG. 1)

  However, in the luminaire 100 described in Patent Document 1 described above, since the difference in luminance between the portion of the globe 105 where the fluorescent lamp 104 is projected and the outer portion of the globe 105 is large, the appearance of the globe 105 is not good. There was a problem.

  The present invention has been made to solve the conventional problems, and provides a lighting apparatus capable of improving the appearance of a globe by eliminating a difference in luminance between a projection portion and an outer portion of a fluorescent lamp in the globe. With the goal.

  The luminaire of the present invention includes a fluorescent lamp having an arc tube that swirls around a central portion of the tube and becomes higher toward the central portion of the tube, and a globe that covers an irradiation surface side of the fluorescent lamp. The instrument has a configuration in which the globe is formed such that the distance between the inner surface of the globe and the arc tube increases toward the outermost part of the fluorescent lamp.

  With this configuration, the brightness of the fluorescent lamp projected onto the globe is gradually reduced by increasing the distance between the globe and the fluorescent lamp toward the outermost part of the fluorescent lamp. It is possible to reduce a luminance difference from a portion where the lamp is projected. Thereby, the fall of the light in the outer part of a lighting fixture can be prevented, and the external appearance of the glove at the time of lighting can be improved.

  Moreover, the lighting fixture of this invention has the structure which provided the light-diffusion means in the inner surface of the area | region where the said globe faces the said fluorescent lamp.

  With this configuration, light is diffused on the fluorescent lamp projection surface on the inner surface of the globe, so that the degree of light drop on the globe surface can be relatively reduced outside the fluorescent lamp, and the appearance of the globe during lighting can be improved. Can do.

  The present invention gradually decreases the brightness of the fluorescent lamp projected onto the globe by increasing the distance between the globe and the fluorescent lamp toward the outermost part of the fluorescent lamp. It is possible to reduce a luminance difference from a portion where the lamp is projected. Thereby, the lighting fixture which has the effect that the fall of the light in the outer part of a lighting fixture can be prevented, and the external appearance of the glove at the time of lighting can be improved can be provided.

Hereinafter, the lighting fixture of embodiment of this invention is demonstrated using drawing.
1 is a cross-sectional view of a lighting apparatus according to an embodiment of the present invention, FIG. 2 is a cross-sectional view showing a modification of FIG. 1, FIG. 3 is an explanatory view of a concave portion of the reflector, and FIG. 4 is a modification of FIG. It is explanatory drawing shown.

  As shown in FIG. 1, a lighting fixture 10 according to the present invention comprises a disk-like fixture body 12 attached to, for example, a ceiling 11 as a mounted portion, and a fluorescent lamp 20 as a light source is attached to the fixture body 12. Is done. A glove 13 that covers the irradiation surface side of the instrument main body 12 and the fluorescent lamp 20 is detachably attached to the instrument main body 12. In addition, on the lower surface of the instrument main body 12, a reflecting plate 30 that is painted or plated in a color that reflects light such as white is provided to reflect the light of the fluorescent lamp 20 in the irradiation direction.

  The fluorescent lamp 20 has a double spiral shape in which an arc tube 21 made of a series of bent glass tubes is swirled in a spiral on a substantially single plane with the tube center portion 211 as a center. The arc tube 21 becomes higher as it goes. That is, it has a mountain shape that becomes lower from the tube central portion 211 toward the outer peripheral portion.

  The distance L between the arc tube 21 and the inner surface of the globe 13 is L1 in the tube center portion 211, which is the first turn of the helix, and the distance between the second turn of the helix and the globe 13 is L2, and the N turn of the helix. The distance between the eyes and the globe 13 is LN, and is formed so as to increase toward the outermost part of the fluorescent lamp 20. That is, L1 <L2 <... <LN.

  A base 22 is provided at both ends of the arc tube 21, and a pair of upper and lower lamp pins 23, 23 are provided protruding from the base 22. By attaching the lamp pin 23 to a lamp socket (not shown) attached to the instrument main body 12, driving power can be obtained. A bridge 24 that holds the arc tube 21 is provided between the caps 22 and 22.

  Since the helical fluorescent lamp 20 emits light in a planar shape, uniform light can be obtained up to the central portion as compared with a single or double annular fluorescent lamp. Further, the size can be reduced as compared with an annular fluorescent lamp having an arc tube of the same length.

  As shown in FIG. 1, the globe 13 is made of transparent or translucent resin, and has a main part 133 on the lower surface and an outer peripheral part 134 that rises from the periphery of the main part 133. The main part 133 includes a projection part 132 in an area facing the fluorescent lamp 20 and an outer part 131 that is an area outside the projection part 132. Further, the outer peripheral portion 134 is formed to rise from the outermost edge of the outer shell portion 131 toward the instrument main body 12.

As shown in FIG. 2, it is desirable to provide the light diffusing means 14 on the inner surface of the projection unit 132 in the globe 13 to improve the diffusibility compared to the outer peripheral surface of the fluorescent lamp 20.
As the light diffusion means 14, silk printing, prism processing, pasting of a diffusion sheet, or the like can be used.

  Thereby, since light is diffused in the projection part 132 of the fluorescent lamp 20 on the inner surface of the globe 13, the degree of light drop on the globe surface can be relatively reduced outside the fluorescent lamp 20, and the appearance of the globe when it is turned on Can be improved.

As shown in FIG. 1, the reflecting plate 30 has a flat plate-like general portion 31 that faces the fluorescent lamp 20 and a concave portion 32 that is positioned outside the outermost portion 201 of the fluorescent lamp 20.
As shown in FIG. 3, in the concave surface portion 32, the incident angles θ <b> 1 to θN of the reflected light R <b> 1 to RN to the globe 13 from the concave surface portion 32 are substantially constant in a range outside the outermost portion 201 of the fluorescent lamp 20. It is formed as follows. That is, θ1≈θ2≈θ3≈θ4≈.
Here, the incident angle θ to the globe 13 is an angle between the incident reflected light R and the normal line at the incident point on the inner surface of the globe 13.

  As shown in FIG. 4, a line S that connects the center of the outermost portion 201 of the fluorescent lamp 20 and the upper end 135 of the outer peripheral portion 134 of the globe 13 with the lower end portion 321 of the outermost periphery of the concave surface portion 32 of the reflector 30. It is desirable to be located at the same or above.

  Thereby, the lower end portion 321 of the concave surface portion 32 of the reflecting plate 30 can be prevented from blocking the light projected on the outer peripheral portion 134 of the globe 13, so that the light falls on the outer peripheral portion 134 of the globe 13. The appearance of the globe 13 can be improved.

As described above, according to the luminaire 10 according to the embodiment described above, the distance L between the globe 13 and the fluorescent lamp 20 is increased toward the outermost portion 201 of the fluorescent lamp 20, whereby the fluorescent lamp 20 projected onto the globe 13. The brightness is gradually reduced.
For this reason, the brightness difference between the outer shell 131 of the globe 13 where the fluorescent lamp 20 is not projected and the projection 132 where the fluorescent lamp 20 is projected can be reduced. Thereby, the fall of the light in the outer part 131 of the lighting fixture 10 can be prevented, and the external appearance of the globe 13 at the time of lighting can be improved.

  Further, a concave surface portion 32 is formed in the region of the reflector 30 located outside the outermost part 201 of the fluorescent lamp 20, and the reflected light R incident on the inner surface of the globe 13 in the outer area from the outermost part 201 of the fluorescent lamp 20 is formed. Since the incident angle θ is substantially constant, the transmission and reflection of the reflected light R with respect to the globe 13 can be made constant, and the difference between the outer portion 131 and the projection portion 132 of the globe 13 can be reduced. Thereby, the fall of the light in the outer shell part 131 of the globe 13 can be prevented, and the appearance of the globe 13 can be improved.

  In addition, the lighting fixture of this invention is not limited to embodiment mentioned above, A suitable deformation | transformation, improvement, etc. are possible.

Sectional drawing of the lighting fixture concerning embodiment of this invention Sectional drawing which shows the modification of FIG. Illustration of the concave part of the reflector Explanatory drawing which shows the modification of FIG. Cross-sectional view of the main parts of a conventional lighting fixture

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Lighting fixture 13 Globe 132 Projection part (area to face)
14 Light Diffusing Means 20 Fluorescent Lamp 201 Outermost 21 Light Emitting Tube 211 Tube Center L Distance

Claims (2)

A fluorescent lamp having an arc tube that swirls around the center of the tube and rises toward the center of the tube;
A glove that covers the irradiation surface side of the fluorescent lamp,
The globe is formed so that a distance between an inner surface of the globe and the arc tube increases toward the outermost part of the fluorescent lamp.   The lighting apparatus according to claim 1, wherein the globe is provided with light diffusing means on an inner surface of a region facing the fluorescent lamp.

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