JP2014143156A - LED lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To develop an LED lamp that resembles a conventional incandescent lamp in a light emission shape, and can create an antique or nostalgic atmosphere.SOLUTION: An LED lamp includes: a surface-emitting LED 12; a transparent solid columnar lens 14 receiving light emitted from the LED 12 at a bottom surface 14a opposed to the light-emitting surface 12a of the LED 12, and formed of a concave hole 14g for scattering light on a top surface 14h; and power supply means 20 for supplying power to the LED 12. The lens 14 is a circular column, a truncated cone, a polygonal pillar or a truncated pyramid. The concave hole 14g is the circular column, the truncated cone, the polygonal pillar or the truncated pyramid, gradually widened toward the top surface 14h of the lens 14.

Description

  The present invention relates to an LED lamp whose light emission shape is similar to a conventional incandescent bulb.

  Light-emitting diodes (hereinafter referred to as “LEDs”), which have lower power consumption and longer life than conventional incandescent bulbs, are used as one of the energy-saving measures along with increasing ecological awareness of consumers. Is rapidly spreading, and in particular, there is an increasing demand for using an LED light-emitting device incorporating an LED as an alternative to an incandescent lamp (Patent Document 1).

  As a result, incandescent lamps such as mini-krypton type light bulbs as light sources such as chandeliers and ball-type light bulbs widely used for general illumination are rapidly being replaced with LED light bulbs that imitate them. This is because the brightness of the LED element approaches the brightness of the incandescent light bulb by improving the efficiency of the LED element and improving the heat dissipation technology. However, even if the brightness of the LED element approaches the brightness of the incandescent bulb, the light emitted from the LED element is uniform light and is completely different from the light from the filament of the conventional incandescent bulb.

  However, in the interior lighting, there are cases where antique or retro lighting such as store lighting is required, as well as a case where only brightness is required such as a fluorescent lamp. In such a case, the current LED lamp cannot cope.

Utility Model Registration No. 314312

  This invention is made | formed in view of such a problem, The light emission shape is similar to the conventional incandescent lamp, and it makes it the subject to develop the LED lamp which can bring out an antique or retro atmosphere.

The invention described in claim 1
A surface emitting LED 12;
A transparent solid columnar lens 14 that receives light emitted from the LED 12 at the bottom surface 14a facing the light emitting surface 12a of the LED 12 and has a concave hole 14g for light scattering formed on the top surface 14h;
Power supply means 20 for supplying power to the LED 12,
The lens 14 is formed in a cylinder, a polygonal column, a truncated cone or a polygonal frustum, and the concave hole 14g is a cone, a truncated cone, a polygonal pyramid or a polygonal frustum that gradually expands toward the top surface 14h of the lens 14. LED lamp 10 characterized by the following.

  The invention described in claim 2 is characterized in that, in the LED lamp 10 of claim 1, a linearly continuous point 14i is formed in the lens 14 instead of the concave hole 14g.

  According to a third aspect of the present invention, in the LED lamp 10 of the second aspect, the continuous line of the points 14i draws a substantially M shape when viewed from one front surface of the lens 14, and a substantially V shape when viewed from the top surface 14h. It is formed as follows.

  The invention described in claim 4 is characterized in that, in the LED lamp 10 described in claims 1 to 3, the surface of the light scattering concave hole 14g is formed into a rough surface.

  According to the first aspect of the present invention, the light irregularly reflected in the lens 14 shines like a filament around the concave hole 14g, creating an antique or retro atmosphere. Similarly, in claims 2 and 3, since the continuum of the points 14i shines like a filament, the same effect is produced. Further, if the surface of the concave hole 14g is formed to be a rough surface, the above-described effect can be further emphasized if stronger reflection is obtained on the surface.

It is sectional drawing of the LED lamp (Example 1) to which this invention was applied. FIG. 2 is a perspective view of FIG. 1. 6 is a partial perspective view showing an LED lamp according to a modification of Example 1. FIG. 6 is a partial perspective view showing an LED lamp according to a further modification of Example 1. FIG. (a) is the top view which looked at the LED lamp main body concerning Example 2 from the top surface, (b) is the perspective view, (c) is the front view, (d) is the side view.

  An LED light emitting device 10 to which the present invention is applied will be described with reference to the drawings. 1 and 2 show the first embodiment. The LED light-emitting device 10 is roughly composed of a surface-emitting LED 12, a lens 14, a cover 16 provided as necessary, a base 18, a base 19, and power supply means. 20.

  The LED 12 is a semiconductor element that emits light when a predetermined voltage is applied, and is mounted and held at the center of the upper surface of the base 18 in the drawing. The LED 12 is of a type that emits light on a light emitting surface 12a having a disk shape (which may of course be rectangular), and its light distribution pattern is a so-called Lambertian type. This Lambertian light distribution pattern is characterized by the fact that most of the light is gathered at the optical axis (= 0 °) and its vicinity, and the angle formed with the optical axis is emitted from the LED 12 within a range of ± 30 °. 50% of the total light is included, 70% of the total light is included in the range of ± 45 °, and 90% of the total light is included in the range of ± 60 °. Yes.

  The lens 14 is a transparent solid body made of glass or resin having a bottom surface 14 a that receives light emitted from the LED 12, and the bottom surface 14 a faces the LED 12 (more precisely, the bottom surface 14 a and the light emitting surface 12 a of the LED 12. Are attached to the center of the upper surface of the base 18 in FIG. The lens 14 is a hexagonal column in this embodiment, and the concave hole 14g formed in the top surface 14h is a cone or a truncated cone that gradually expands toward the top surface 14h of the lens 14. Further, a leg portion 14e is provided on the periphery of the bottom surface of the lens 14 so as to protrude downward in FIG. Plural leg portions 14e may be arranged, or may be arranged in a ring shape on the outer peripheral portion of the bottom surface 14a. Further, the leg portion 14e may be integral with the lens 14, or may be a separate body. Of course, in the lens 14, the leg portion 14 e is not an essential component, and the lens 14 may be configured only by the lens body 14 c.

  Further, the surface of the concave hole 14g for light scattering is subjected to sandblasting, or the portion where the concave hole 14g of the mold cavity for forming the lens 14 is formed to be a rough surface (including a fine uneven surface). The surface of the concave hole 14g of the lens 14 may be roughened (including a fine uneven surface) by transferring it to the surface of the concave hole 14g of the lens 14.

  The cover 16 is a member provided as necessary. In this embodiment, a hollow substantially spherical body formed of transparent glass is disposed on the upper surface of the base 18 so as to enclose the LED 12 and the lens 14. ing. The shape of the cover 16 is not limited to a spherical shape, and may be a curved body such as a shell shape, or may be configured by combining a plurality of curved surfaces or planes. Also, the material is not limited to transparent glass, but may be composed of other transparent bodies (resins).

  The base 18 is a member that holds the LED 12, the lens 14, and the cover 16, and that houses a power supply unit 20 that supplies electric power from the outside to the LED 12, and includes an upper base 22 and a lower base 24. Has been.

  The upper base 22 is a covered cylindrical body (of course, may be a rectangular tube shape) formed of a material excellent in heat conduction and heat dissipation such as metal (for example, aluminum) or ceramic, and its top surface. A groove 22b for attaching the LED 12 and the cover 16 is formed in 22a, and a communication hole 26 is provided in the lid portion 22c to communicate the internal space 22d of the upper base 22 with the top surface 22a side. ing.

  Similar to the upper base 22, the lower base 24 is formed of an insulating material such as ceramic, and is a different-diameter columnar body including a large diameter portion 24a, a small diameter portion 24b, and a tapered portion 24c therebetween. The outer diameter of the large diameter portion 24a is formed to be slightly smaller than the inner diameter of the upper base 22, and most of the large diameter portion 24a is inserted and fixed to the bottom of the upper base 22 (this embodiment) The upper base 22 and the lower base 24 are fixed with screws 28, but may be fixed with an adhesive or the like instead. On the other hand, a screw for screwing into the base 19 is formed on the outer peripheral surface of the small diameter portion 24b. Further, the lower base 24 is formed with a communication hole 30 extending from the upper surface of the large diameter portion 24a to the lower surface and the side surface of the small diameter portion 24b via the inside of the tapered portion 24c. Most of these are disposed in the communication hole 30.

  The base 19 is a bottomed cylindrical body that is screwed into a socket (not shown) such as a lighting fixture, and protrudes from a side surface portion 19a made of a conductive material (for example, metal) on which a screw is formed, and from the bottom surface. The conductive material protruding portion 19b and the insulating portion 19c made of an insulating material that electrically insulates between the side surface portion 19a and the protruding portion 19b.

  The power supply means 20 is for supplying the power supplied to the base 19 to the LED 12, transforms the voltage applied to the base 19 to the drive voltage of the LED 12, and an excessive current flows to the LED 12. The driving circuit 20a is configured to include a pair of input-side lead wires 20b that conducts between the base 19 and the driving circuit 20a, and a pair of output-side lead wires 20c that conducts between the driving circuit 20a and the LED 12. Further, the drive circuit 20a is disposed in a portion of the communication hole 30 of the lower base 24 that is widely formed on the upper end side in the figure, and the input side lead wire 20b is arranged on the lower end side of the communication hole 30 in the figure. The output-side lead wire 20 c is inserted into a communication hole 26 formed in the lid portion 22 c of the upper base 22.

  If this LED lamp 10 shows an example, it will be manufactured in the following procedures. The LED 12 is mounted on the upper surface of the upper base 22 in the figure, and the lens 14 and the cover 16 are attached with an adhesive or the like in this order so as to cover the LED 12, and the power supply means 20 is included at the lower end of the upper base 22. The lower base 24 is inserted and fixed with the screw 28, and then the base 19 is attached to the lower end portion of the lower base 24.

  When the LED 12 is turned on, the light emitted from the light emitting surface 12a enters the inside from the bottom surface 14a of the lens 14 and diffusely reflects and exits from the side surface 14b, the top surface 14h, and the concave hole 14g. And the ridgeline 14f of the side surface 14b of the lens 14 shines strongly, and the filament of the incandescent bulb stretched in an M shape shines when viewed from the side 14b of the hexagonal prism lens 14 (or from the front). Appears to look like. By making the light emission color of the LED 12, the color of the lens 14 and the color of the cover 16 orange, for example, a conventional incandescent light bulb, it can be more imitated by a conventional incandescent light bulb. You can create a mood.

  In the above case, the lens 14 is a hexagonal column, but the lens 14 may be a cylinder, a triangular column, a quadrangular column or more, or a truncated cone, a triangular frustum, a quadrangular pyramid or more. Good. Similarly to the above, the concave hole 14g also has a cone, a truncated cone, a triangular pyramid, a quadrangular pyramid, or a larger polygonal pyramid that gradually expands toward the top surface 14h of the lens 14, and further a triangular frustum, a quadrangular pyramid or More polygonal frustums can be used, and the lens 14 and the recessed hole 14g can be freely combined with the above-mentioned shapes. For example, when the lens 14 is a cylinder or a truncated cone, the concave hole 14g is a cone, a truncated cone or a polygonal pyramid or a polygonal truncated cone. It can be a polygonal pyramid or a polygonal frustum. Of course, in the above combination, although there are some differences in the light emission state, it is possible to emit light imitating the light emission state by various filaments. When the lens 14 is a truncated cone or a polygonal frustum, the larger area of the truncated cone or the polygonal frustum may be the top surface 14h side, or conversely, the bottom surface 14a side.

  The second embodiment of the present invention is a case where a linearly continuous point 14 i is formed in the lens 14 instead of the concave hole 14 g of the first embodiment. In this case as well, the lens 14 may be a cylinder, a triangular prism, a quadrangular prism or a polygonal prism, or a truncated cone, a triangular frustum, a quadrangular pyramid or a polygonal truncated cone. In the illustrated embodiment, a cylinder is used.

  The point 14i is formed by condensing the laser at a predetermined position of the lens 14 and overheating the portion, thereby generating a point-like crack when the lens 14 is made of glass and generating bubbles when the lens 14 is made of resin. become. In this embodiment, in accordance with the shape of the filament, the shape of the lens 14 viewed from one front surface is approximately M-shaped, approximately V-shaped when viewed from the plane, and approximately linear when viewed from the side. It is formed continuously. Of course, the shape of the continuum of the points 14i is not limited to this, and is formed by imitating various filaments.

  When the light of the LED 12 is incident on the lens 14 in which the continuum of the points 14i is formed in this way, the point 14i which is a defect shines continuously, and it looks as if the filament is shining. As described above, the light emission color of the LED 12, the color of the lens 14, and the color of the cover 16 are changed to, for example, the orange color of a conventional incandescent light bulb. You can create the mood of an incandescent bulb.

  As described above, if the surface of the concave hole 14g is formed to be rough, the above-described effect can be further emphasized if stronger reflection is obtained on the surface.

DESCRIPTION OF SYMBOLS 10 ... LED light-emitting device, 12 ... LED, 12a ... Light emission surface, 14 ... Lens, 14a ... Bottom surface, 14b ... Side surface, 14e ... Leg part, 14f ... Ridge line, 14g ... Recessed hole, 14h ... Top surface, 14i ... Point, DESCRIPTION OF SYMBOLS 16 ... Cover, 18 ... Base, 19 ... Base, 19a ... Side surface part, 19b ... Projection part, 19c ... Insulation part, 20 ... Power supply means, 20a ... Drive circuit, 20b ... Input side lead wire, 20c ... Output side lead Line 22, upper base, 22 a, top surface, 22 b, groove, 22 c, lid portion, 22 d, internal space, 24, lower base, 24 a, large diameter portion, 24 b, small diameter portion, 24 c, taper portion, 26,. Communication hole, 28 ... screw, 30 ... communication hole.

Claims (4)

Surface-emitting LEDs,
A transparent solid columnar lens in which light emitted from the LED is received at the bottom surface facing the light emitting surface of the LED, and a concave hole for light scattering is formed on the top surface;
Power supply means for supplying power to the LED,
The lens is formed in a cylinder, a polygonal column, a truncated cone, or a polygonal frustum, and the concave hole is a cone, a truncated cone, a polygonal pyramid, or a polygonal frustum that gradually expands toward the top surface of the lens. LED lamp.   2. The LED lamp according to claim 1, wherein a point that is continuous in a line instead of the recessed hole is formed in the lens.   3. The LED lamp according to claim 2, wherein the continuous line of dots draws a substantially M shape when viewed from one front surface of the lens and a substantially V shape when viewed from the top surface. The LED lamp according to any one of claims 1 to 3, wherein the surface of the concave hole for light scattering is formed into a rough surface.

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