JP2013214380A - Lighting fixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure a high amount of light by eliminating luminance unevenness in a lighting fixture having a cold-cathode tube as a light source.SOLUTION: A lighting fixture has a plurality of lamp units 10 which each have, as a light source, a cold-cathode tube wound in a spiral form, on a light base 1. A lower part where the lamp units are located is formed in a concave face 2, and a surface treatment is applied to it for enhancing reflective performance.

Description

  The present invention relates to a lighting fixture using a cold cathode tube as a light source, and more particularly to a lighting fixture that eliminates uneven luminance and ensures a high light quantity.

  Obviously, in order to increase the amount of light in a lighting fixture using a cold cathode tube as a light source lamp, it is sufficient to accommodate a lamp having a high amount of light in the lighting fixture.

  On the other hand, a lamp in which a fluorescent tube is spirally wound and a lamp in which a cold cathode tube is spirally wound are known (Patent Documents 1 and 2).

JP 2006-244912 A Japanese Patent Laid-Open No. 5-89834 Utility Model Registration No. 3173544

  In order to increase the light quantity of the lamp, the total length of the lamp must be increased. However, if the total length of the lamp is increased, the total length of the luminaire that accommodates the lamp is also increased, resulting in a problem that the luminaire is enlarged.

  Therefore, it can be assumed that a plurality of lamps held down to an appropriate length are prepared and accommodated in one lighting fixture. In this case, in order to make the luminaire most compact, it can be assumed that it is configured in a square shape. However, this increases the number of lamps for one luminaire, which increases the cost of the lamp. Since the number of sockets and the number of lighting circuits increases, there is a problem that the cost increases.

  On the other hand, in the case of a lamp in which the cold cathode tube is spirally wound, since the cold cathode tube configured to be as long as possible can be accommodated in an area having the same aspect ratio, a high amount of light is ensured while being compact. A lighting fixture can be realized.

  However, in the case of a cold-cathode tube in which the tube diameter cannot be increased, if a single cold-cathode tube is used to secure a sufficient amount of light, the lamp has a long length with a large number of turns. As a result, in the case of a helical cold cathode tube manufactured by winding a straight tube while being softened with heat, the number of windings becomes excessive, making it very difficult to manufacture, and the ratio between the tube diameter and the total length is excessive. As a result, the problem of becoming brittle with respect to external force also occurred.

  Therefore, the applicant of the present application has previously made a lighting apparatus in which a plurality of lamp units each having a cold-cathode tube wound in a spiral as a light source are arranged on the light base, and a part of the lamp units is arranged at the center. And the lighting fixture which distribute | arranged and distribute | arranged the other lamp unit on the concentric circle is proposed (patent document 3).

  By the way, in a lamp obtained by spirally winding a tube, a problem has been pointed out that luminance unevenness occurs when viewed as a whole lamp due to a gap between adjacent tubes (Patent Document 1). The above-mentioned indication is related to a fluorescent tube having a large tube diameter, but this problem becomes more prominent in the case of a cold cathode tube in which the tube diameter is narrower and the relative ratio to the gap between adjacent tubes is large. become.

  The present invention was created for the purpose of providing a luminaire that solves the above-described problems, and a plurality of lamp units each having a cold-cathode tube wound in a spiral as a light source are arranged on the light base. In the luminaire, the lower part of the place where the lamp unit is located is formed in a concave surface, and surface treatment for improving the reflection performance is performed.

  Moreover, the lighting fixture of Claim 2 WHEREIN: The concave surface below the location where a lamp unit is located in the said lighting fixture was made into spherical shape, It is characterized by the above-mentioned.

  Moreover, the lighting fixture of Claim 3 WHEREIN: The concave surface below the location where a lamp unit is located in the said lighting fixture was made into the shape of a mortar.

  According to a fourth aspect of the present invention, there is provided a lighting device according to the fourth aspect, wherein a concave surface is formed by recessing a lower portion of the light base where the lamp unit is located.

  The lighting fixture according to claim 5 is characterized in that, in the lighting fixture, a lamp unit is mounted on a reflecting member formed on a concave surface, and the reflecting member is mounted on a light base.

  Further, in the lighting fixture according to claim 6, in the lighting fixture, the light base is configured in a mountain shape that rises toward the center, and a part of the lamp unit is arranged at the center of the mountain top, The other lamp units are distributed on a concentric circle at the base of the mountain.

  In general, it is a well-known technique to position a reflecting plate that forms a concave surface behind a lamp, and there is no novelty in itself.

  However, the operation of the above-mentioned known technique is required for the point that light is condensed in the longitudinal direction of the lamp by positioning a lamp serving as a point light source such as an incandescent lamp at the focal point of the reflector constituting the concave mirror. Yes, the background is completely different from the case of the present invention in which a linear light source is wound spirally.

  In the present invention, the light source emits light in a spiral shape, and light incident on the back side thereof is irregularly reflected by the concave surface on the back side, and this is mixed with light from the front side to make the luminance distribution uniform and uneven luminance. In addition, it is possible to illuminate the entire surface of the lamp unit with a substantially uniform amount of light, and as a result, a lighting fixture that secures a high amount of light is realized.

  In this case, as described in the fourth aspect of the present invention, if the concave portion is formed by recessing the portion where the lamp unit is located on the light base, the operation can be realized with a very simple structure. Become.

  Further, as in the invention described in claim 6, the light base is formed in a mountain shape that rises toward the center, a part of the lamp units is arranged in the center of the mountain top, and the other lamp units are arranged in the mountain. If they are distributed on concentric circles that form the base of the light, the light diffuses radially when viewed as a whole of the luminaire, and the illuminator can reach a wider area.

The top view of the state which removed the cover of the lighting fixture of this invention. The top view of the state which removed the lamp unit same as the above. The disassembled perspective view of the principal part of the lighting fixture of this invention. FIG. 2 is an end view taken along line AA in FIG. 1. The top view of the state which attached the cover of the lighting fixture of this invention. Side view as above. The disassembled perspective view of the principal part of the Example from which the lighting fixture of this invention differs.

  Hereinafter, specific embodiments of the present invention will be described with reference to the accompanying drawings. In this embodiment, a ceiling-mounted light is assumed as a lighting fixture. FIG. 1 is a plan view of the lighting apparatus according to the present invention with the cover removed. Reference numeral 1 in the drawing denotes a light base having a plurality of lamp units 10 serving as light sources on the surface. The light base 1 is overlaid on a mounting base 5 whose rear surface serves as a mounting surface with a mounting location such as a ceiling, and is fixed to the mounting base so as not to be detached by pressing plates 6 provided at a plurality of locations on the circumferential side. (See FIG. 4). In the figure, reference numeral 5A denotes a mounting hole that is opened in the center of the mounting base 5 for mounting a mounting plug (not shown) for attaching to and detaching from a sealing outlet fixed to a mounting location such as a ceiling.

  FIG. 2 is a view showing a state in which the lamp unit is removed from the light base 1. Reference numerals 2 and 2A in the figure are concave surfaces formed below the location where the lamp unit 10 is located. Here, the concave surface is formed by recessing the location below the location where the lamp unit on the light base 1 is located. . Here, a spherical surface is adopted as the concave surface shape (see FIG. 3), but the shape is not limited to this, and it may be a mortar shape including a linear tapered surface.

  The concave surfaces 2 and 2A are subjected to a surface treatment for improving the reflection performance. As this type of surface treatment, in addition to white or metallic coating with a resin-based paint, it is assumed that the entire light base is coated with high reflection performance.

  Here, the light base 1 is formed in a mountain shape that rises toward the center so that the light diffuses radially and the illumination light reaches a wider range, and one lamp unit 10A is arranged at the center that is the top of the mountain. The other five lamp units 10 are distributed evenly on a concentric circle at the base of the mountain. Each of the recesses is provided correspondingly, but the recess 2A provided in the center is detachable by separating the circular region of the light base 1 at that location from the other regions. This is for removing the circular area of the light base 1 when attaching the lighting fixture to the ceiling surface, thereby creating a window in the light base, and performing the mounting operation of the lighting fixture on the ceiling through the window. .

  Of course, the arrangement and the number of the lamp units described above are not limited to those described above.

  FIG. 7 is a figure which shows the Example from which the concave surface of the lighting fixture of this invention differs. Here, the lamp unit is mounted on the reflecting member 20 formed on the concave surface 22, and the reflecting member is mounted on the light base 1.

1 Light Base 2 Concave Surface 2A Concave Surface 10 Lamp Unit 10A Lamp Unit

Claims (6)

  In a lighting fixture in which a plurality of lamp units each having a cold cathode tube wound in a spiral as a light source are arranged on the light base, a surface for forming a concave portion below the position where the lamp unit is located and improving the reflection performance A luminaire characterized by being treated.   The lighting fixture according to claim 1, wherein the concave surface is spherical.   The lighting apparatus according to claim 1, wherein the concave surface has a mortar shape.   The luminaire according to claim 1 or 2, wherein a concave surface is formed by recessing a lower portion of a place where the lamp unit on the light base is located.   The lighting fixture according to claim 1 or 2, wherein a lamp unit is mounted on a reflecting member formed on a concave surface, and the reflecting member is mounted on a light base.   The light base is formed in a mountain shape that rises toward the center, and some of the lamp units are arranged in the center, which is the top of the mountain, and other lamp units are distributed on a concentric circle, which is the base of the mountain. The lighting fixture in any one of Claim 1 to 5.

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