JP2010129220A - Lighting fixture - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lighting fixture with an outer appearance of a globe improved. <P>SOLUTION: Since a reflecting plate 30 is formed in a concave face 32 so that an incident angle θ of reflected light R incident into an inner face of the globe 13 is to b nearly constant in a range outside of an outermost part 201 of a light source 20, transmission and reflection of the reflected light R against the globe 13 are made constant to alleviate luminance difference between an outer shell part 131 of the globe 13 and a part facing the light source 20. With this, fall of light at the outer shell part 131 of the globe 13 is prevented to improve an outer appearance of the globe 13. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a luminaire using a light source having an annular or spiral arc tube.

Conventionally, an improvement in the appearance of a glove of a lighting fixture using a light source having an annular or spiral arc tube has been proposed (see, for example, Patent Document 1).
As shown in FIG. 5, a lighting fixture 100 described in Patent Document 1 has a fixture main body 102 installed on a fixture mounting surface 101, and the fixture main body 102 has a first annular first ring with a small outer diameter. The arc tube 103 and an annular second arc tube 104 having a large outer diameter are provided outside the first arc tube 103. Further, the instrument body 102 is formed in a substantially flat plate shape on the inner side of the outer peripheral reflection surface portion 105 and the outer peripheral reflection surface portion 105 that reflects the irradiation light from the second arc tube 104 toward the outer peripheral direction, And a reflector 107 having a plane reflecting surface portion that reflects the irradiation light from the first arc tube 103.

Then, in a state where the instrument body 102 is installed on the instrument mounting surface 101, the second arc tube 104 is located above the first arc tube 103 and faces the outer peripheral reflection surface portion 105. The holder 108 is disposed and supported so that the first arc tube 103 is located below the planar reflecting surface portion 106. Note that the front of the first arc tube 103 and the second arc tube 104 is covered with a globe 109.
As a result, the light from the second arc tube 104 is reflected in the outer peripheral direction by the outer peripheral reflection surface portion 105 of the reflector 107, so that the light is dispersed and the lamp image hardly appears and the appearance of the globe 109 is improved. .
JP 2006-128147 A (FIG. 2)

  However, in the luminaire 100 described in Patent Document 1 described above, only the outermost second arc tube 104 is reflected outward by the reflector 107 to disperse light and improve the lamp image. However, further improvements are desired.

  The present invention has been made to solve the conventional problems, and an object thereof is to provide a lighting apparatus capable of improving the appearance of a globe.

  The luminaire of the present invention is a luminaire having a light source having an annular or spiral-shaped arc tube, a reflector that reflects light from the light source, and a globe that covers an irradiation surface side of the light source, The reflecting plate has a configuration in which a concave surface is formed such that an incident angle of the light reflected by the reflecting plate to the globe is a substantially constant angle in a range from the outermost side to the outer side of the light source.

  With this configuration, the reflecting plate is formed in a concave surface so that the incident angle of the reflected light incident on the inner surface of the globe is substantially constant in the range from the outermost side of the light source to the outer side. Can be made constant, and the difference between the outer portion of the globe and the portion facing the light source can be reduced. Thereby, the fall of the light in a glove outer part can be prevented and the external appearance of a glove can be improved.

  Further, in the lighting fixture of the present invention, the globe has a main part on the lower surface and an outer peripheral part that rises from the periphery of the main part, and a lower end part on the outermost periphery of the reflector plate has the light source and the globe. It has the structure located in the same or upper direction as the line which connects an outer peripheral part upper end.

  With this configuration, it is possible to prevent the reflecting plate from blocking the light projected on the globe, so that it is possible to prevent the light from dropping on the outer periphery of the globe and improve the appearance of the globe.

  In the present invention, the reflection plate is formed in a concave surface so that the incident angle of the reflected light incident on the inner surface of the globe is substantially constant in the range from the outermost side to the outer side of the light source. Can be made constant, and the difference between the outer portion of the globe and the portion facing the light source can be reduced. Thereby, the lighting fixture which has the effect that the fall of the light in a glove outer part can be prevented and the external appearance of a glove 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 a conventional lighting fixture

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Lighting fixture 13 Globe 133 Main part 134 Outer part 135 Outer part upper end 20 Fluorescent lamp (light source)
201 outermost part 21 arc tube 30 reflector 32 concave surface part (concave surface)
321 Lower end R Reflected light S A line connecting the fluorescent lamp and the upper end of the outer periphery of the globe θ Incident angle

Claims (2)

A light source having an annular or helical arc tube;
A reflector that reflects light from the light source;
A glove covering the irradiation surface side of the light source,
The lighting device is characterized in that the reflecting plate is formed in a concave surface so that an incident angle of the light reflected by the reflecting plate to the globe becomes a substantially constant angle in a range from the outermost side to the outer side of the light source. . The globe has a main part on the lower surface and an outer peripheral part rising from the periphery of the main part,
The lighting fixture according to claim 1, wherein a lowermost end portion of the outermost periphery of the reflecting plate is located at or above a line connecting the light source and an upper end portion of the outer periphery of the globe.

Images