JP2010098159A - Led bulb - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an LED bulb securing more uniform illumination light even when a light source body of an LED (Light-Emitting Diode) with strong directivity is used. <P>SOLUTION: In a transparent or translucent spherical sell 2, a plurality of LED light source bodies 5 are arranged on a substrate 4 for wiring provided in a cap 3, a plurality of cylindrical optical transmission members 7 are arranged so as to extend in parallel using the substrate side as one end, the LED light source bodies are assigned and made to belong so as to face each one end of the member, part of light from each LED light source body goes straight inside the optical transmission member to which it belongs to reach the upper end of the spherical shell from the other end of the member, other light is irregularly reflected on a recess 7a provided at an inner peripheral part of each optical transmission member to reach the side of the spherical shell 2 from a surrounding surface of the optical transmission member and thus, the uniform illumination light is emitted from the whole spherical shell. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an LED bulb using a light source body of an LED (light emitting diode) as a light source body of the bulb.

  This type of LED bulb has become a so-called bulb-type fluorescent lamp, in which a fluorescent lamp is arranged in a normal incandescent bulb or a bulb shell of the bulb with the expansion of demands such as longer life of the bulb and power saving. It has come to be noticed as a new light bulb different from the lamp. As a commercially available LED bulb, a structure in which a plurality of LED light source bodies are arranged on a base end for wiring provided on a base and covered with a transparent or translucent spherical shell can be seen. In addition, the spherical shell is subjected to diamond cutting to reduce the straightness of light emission of the LED light source body and to generate more uniform illumination light over the entire spherical shell, or the spherical shell may be formed of ground glass or the inner surface of the spherical shell. There is also an idea to apply a fluorescent agent to give the same effect.

  In addition, there are also devices in which the power supply circuit configuration is devised to use a commercial power supply similar to a normal incandescent bulb or a bulb-type fluorescent lamp (for example, Patent Documents 1 and 2).

  Furthermore, since the LED light source body has a remarkable straightness in light emission, it is not suitable for general lighting fixtures that require illumination of the entire surroundings. An LED light source body is disposed corresponding to one or both ends of the light transmission member, and an uneven portion for causing irregular reflection of light is provided along the longitudinal direction on the inner peripheral surface of the cylindrical light transmission member. Lighting fixtures or lighting apparatuses that constitute two lighting units have also been proposed (for example, Patent Documents 3 to 5).

  For example, in Patent Document 3, the concave and convex portion provided on the inner peripheral surface of the cylindrical light transmission member is formed by inserting a retroreflective synthetic resin sheet having an irregular shape into the inner surface of the light transmission member. Alternatively, as proposed by the applicant of the present application in Patent Document 4, by disposing the protrusions by applying the inner peripheral surface of the cylindrical light transmission member, it is further shown in Patent Document 5 In addition, it is known that when a light transmission member is molded with a semi-transparent resin, a protrusion can be integrally formed on the inner peripheral surface.

JP 2005-190899 A JP 2007-257828 A Japanese Utility Model Publication No. 62-153701 Japanese Patent No. 3243466 Japanese Patent No. 4021458

  In the conventional LED bulb, as described above, since a plurality of LED light source bodies are simply arranged in a distributed manner on the substrate, when this is used for a light bulb, the straightness of the LED light source body is remarkable, In front of the light bulb, a non-uniform lighting phenomenon occurs such that a person cannot see it directly, and the spot is so strongly illuminated that the surrounding portion becomes extremely dark. In addition, in order to improve this, the straightness of light is eased with a structure in which the spherical shell has a lens effect, the spherical shell is made of frosted glass, or the inner surface is coated with a fluorescent agent. There was a problem that the degree of light absorption became high and the entire bulb became dark. And in order to make it brighter, it was necessary to provide more LED light source bodies, and there existed a problem that manufacturing cost increased.

  Accordingly, the present invention has been made in view of the above-mentioned problems, and an object thereof is to provide an LED bulb using an LED light source body that enables more uniform illumination and can be manufactured at a low cost. is there.

  To achieve the above object, in the present invention, a transparent or translucent spherical shell, a base attached to one end of the spherical shell, and an LED (light emitting diode) light source disposed in the spherical shell. A plurality of LED light source bodies are arranged so as to emit light along the longitudinal axis of the LED bulb, and one end is placed on the substrate side. The other ends of the LED bulbs are arranged so as to extend in parallel with each other along the longitudinal axis of the LED bulb, the LED light source bodies are respectively exposed at the one end, and the inner peripheral surface has the The present invention proposes an LED bulb including a plurality of transparent or translucent cylindrical light transmission members provided with uneven portions for irregularly reflecting light from an LED light source along the longitudinal direction thereof.

  Further, in the present invention, in the above-described configuration, a plurality of LED light source bodies are exposed at one end of each cylindrical light transmission member, and a plurality of LED light source bodies respectively belonging to each of the cylindrical light transmission members. Of which at least one LED light source body is positioned substantially in the center of the cross-section of the cylindrical light transmission member, and the other LED light source bodies are displaced in the direction toward the spherical shell. An LED bulb having a structure as described above is also proposed.

  Furthermore, in the present invention, in the above configuration, the outer periphery of each cylindrical light transmission member is brought into contact with the outer periphery of an adjacent cylindrical light transmission member, and the outer periphery of these cylindrical light transmission members is The present invention also proposes an LED bulb having a configuration in which these cylindrical light transmission members are assembled in a fixed state in the spherical shell by abutting against the inner peripheral surface of the spherical shell.

  In the LED bulb of the present invention, a plurality of transparent or translucent cylindrical light transmission members, which are well-known as illumination units, provided with uneven portions for irregularly reflecting light on the inner peripheral surface, are covered with the LED bulb. In a transparent or semi-transparent spherical shell, arranged parallel to each other along the longitudinal axis of the LED bulb, each end thereof is placed on the substrate side, and the LED light source body arranged on the substrate faces Therefore, each cylindrical light transmission member can illuminate not only in the longitudinal direction of the light transmission member by the light from the LED light source body but also as a light extraction surface around the light transmission member. The light generated from the member can provide more uniform and bright illumination to the outside through the spherical shell. Therefore, an extremely high illumination effect can be achieved as a light bulb with an LED light source body with remarkable linearity.

  Moreover, in the LED bulb of the present invention having the above-described configuration, at least one LED light source body among the plurality of LED light source bodies respectively belonging to each cylindrical light transmission member is arranged in a cross section of the cylindrical light transmission member. The other LED light source body is positioned in a state shifted to one side in the cross section, and the direction of the shift is shifted so as to follow the direction toward the spherical shell. In this configuration, the light emitted from the other end along the longitudinal direction of each light transmission member is secured and the intensity of illumination from the periphery of each light transmission member is directed toward the side of the spherical shell. Since it becomes large, the brightness around the spherical shell can be secured more effectively.

  Furthermore, in the LED bulb of the present invention having the above-described configuration, the outer periphery of each cylindrical light transmission member is brought into contact with the outer periphery of an adjacent cylindrical light transmission member, and further, the outer periphery of these cylindrical light transmission members. In contact with the inner peripheral surface of the spherical shell surrounding the cylindrical light transmission member, and the cylindrical light transmission members are assembled in a fixed state in the spherical shell. It is in a state of being intimately engaged and further fixed in position relative to each other by engagement with the outer spherical shell. Therefore, each cylindrical light transmission member does not require any separate mounting and fixing means such as adhesives or other mechanical fasteners when assembling LED bulbs, so that the work efficiency required for assembly and parts can be improved. Costs can be reduced.

  In order to increase the degree of abutment or engagement of the outer peripheral surface of each cylindrical light transmission member with respect to the inner peripheral surface of the spherical shell during assembly, for example, the corresponding cylindrical portion of the spherical shell Is provided with a slight taper so that the inner peripheral surface of the spherical shell gradually and strongly engages with the light transmission member when the spherical shell is attached from the other end or upper end of each cylindrical light transmission member. In this way, the overall assembly can be further stabilized.

  Hereinafter, embodiments of an LED bulb according to the present invention will be described with reference to the drawings. In FIG. 1, 1 is an LED (light-emitting diode) bulb according to the present invention, 2 is a spherical shell formed of a transparent or translucent polycarbonate plastic material, and 3 is attached to one end or lower end of the open end. It is a clasp. The spherical shell 2 is integrally formed by a curved upper end 2a and a cylindrical portion 2b having a substantially same diameter following the curved upper end 2a. The lower end of the cylindrical portion 2b is a circle of a base that extends upward when the LED bulb 1 is assembled. It is fixed to the ring portion 3a by adhesion or the like. Inside the annular portion 3a, a wiring board 4 is provided on the base 3 in a direction transverse to or horizontally with respect to the longitudinal axis XX of the LED bulb, and a plurality of LEDs (light emitting diodes) are provided on the board 4. The light source body (hereinafter referred to as the LED light source body) 5 is arranged so as to emit light along the longitudinal axis XX direction of the LED bulb 1, and necessary power is supplied to the light source body 5 via the wiring 6. Since this part belongs to public knowledge, its details are omitted.

  7 has one end or a lower end on the side of the substrate 4, and the other end or the upper end is disposed in the spherical shell 2 so as to extend in parallel with each other along the longitudinal axis XX of the LED bulb 1. This is a light transmission member made of a translucent polycarbonate plastic material and formed into a cylindrical shape with upper and lower ends opened. These light transmission members 7 are arranged in a total of six concentric circles around the center P in the cylindrical portion 2a of the spherical shell 2, as shown in the cross-sectional view of FIG. Adjacent light transmission members are in a state of being in partial contact or engagement with each other, and the outer periphery of each light transmission member is in partial contact or engagement with the inner peripheral surface 2c of the spherical shell 2. Presents. As a result, the six cylindrical light transmission members 7 are held in a fixed state in the spherical shell 2 so that they cannot move with each other in this assembled state. That is, in assembling the LED bulb 1, the cylindrical light transmission member 7 is brought into contact or engaged as shown in the figure, so that any other fixing means, for example, an adhesive or a mechanical stopper is used. do not need.

  In FIG. 1, the inner diameter of the cylindrical portion 2 b of the spherical shell 2 is slightly tapered from the lower side to the upper side, so that the taper shape gradually decreases. In other words, as the inner diameter of the cylindrical portion 2b goes upward, the cylindrical portion 2b is set to be slightly smaller than the outer contour diameter surrounding each cylindrical light transmission member 7 shown in FIG. Accordingly, when the spherical shell 2 is covered from above on the plurality of cylindrical light transmission members 7 standing on the substrate 4, the inner peripheral surface of the cylindrical portion 2b of the spherical shell 2 is cylindrical. Since the light transmission member 7 is in contact with or engaged with the light transmission member 7 so as to slightly press inward in the radial direction, the spherical shell and each cylindrical light transmission member 7 are more reliably assembled. In addition, the tapered shape has an advantage that the cylindrical portion 2b can be easily operated even when fitted into the upper ends of the cylindrical light transmission members 7.

  Each cylindrical light transmission member 7 is provided with an uneven portion 7a integrally with the light transmission member 7 on its inner peripheral surface along the longitudinal direction, and one end of the light transmission member 7 is formed by the uneven portion 7a. Further, the light from the LED light source body 5 which is allocated or assigned so as to face the lower end is diffusely reflected here, and the periphery or the side surface of the light transmission member 7 is illuminated as a light extraction surface. The light extracted from the light is emitted to the outside through the cylindrical portion 2a of the spherical shell 2 to provide illumination light as a light bulb.

  As in this embodiment, the concavo-convex portion 7a is another tube having such a concavo-convex portion 7a in addition to the structure formed integrally with the light transmission member 7 by a transparent or translucent polycarbonate plastic material. It is also possible to have a structure in which the cylindrical members are integrated by being inserted into the inner peripheral surface of each cylindrical light transmission member 7, or the applicant of the present application proposed in Patent Document 4 (Japanese Patent No. 3243466). Thus, it is possible to adopt a structure in which the protrusion is formed by applying the inner peripheral surface of the cylindrical light transmission member, and this forming method itself is not limited.

  Since the light emitted from the LED light source 5 to which the cylindrical light transmitting member 7 is arranged or assigned so as to face one end or the lower end of each cylindrical light transmitting member 7 has a straight traveling property, a part of the light is transmitted correspondingly. Light travels straight in the longitudinal direction of the member 7, reaches the curved upper end 2 a of the spherical shell 2 through the opening at the other end or upper end of the light transmission member 7, and is emitted outward from this to emit illumination light as a light bulb I will provide a. The remaining light of the LED light source 5 is taken out to the side of the corresponding light transmission member 7 as described above due to the irregular reflection at the concave and convex portion 2a, and the side of the light bulb through the cylindrical portion 2a of the spherical shell 2 Lighting. In addition, as shown in FIG. 1, the curved upper end 2a of the spherical shell 2 is integrally formed with ring-shaped irregularities on the inner surface. The incident light is dispersed to illuminate more uniformly.

  In this embodiment, the plurality of LED light source bodies 5 facing one end or the lower end of each cylindrical light transmission member 7 are assigned so that three each belong as shown in FIG. At least one of them 5a (one in this embodiment) is arranged so as to be positioned at a substantially central portion in the cross section of the cylindrical light transmission member 7, as shown in FIG. And located on the locus of the concentric circle Q of the center P. On the other hand, the remaining LED light source bodies 5b (two in this embodiment) are arranged so as to be positioned on the locus of the concentric circle R of the center P radially outward from the concentric circle Q, respectively. That is, the remaining two LED light source bodies 5b are positioned in a deviated state that deviates from the central portion in the cross section of the light transmission member 7 to which they belong, and this direction is a direction toward or close to the outer spherical shell 2. It is as a structure which is deviated and located along. Thus, in order to assign a plurality of LED light source bodies 5 to each light transmission member 7, these LED light source bodies 5 are arranged on the substrate 4 in advance according to the arrangement position of the light transmission member 7.

  As described above, at least one of the plurality of LED light source bodies 5 (5a, 5b) belonging to each light transmission member 7 is positioned at a substantially central portion of the cross section of the light transmission member 7, and the remaining LED light sources. By adopting a configuration in which the body 5b is displaced in the direction toward the spherical shell 2, the light from the LED light source body 5a disposed at the substantially central portion thereof travels straight in the longitudinal direction within the light transmission member 7 to which the body 5b belongs. The other light source member 5b contributes to the illumination of the portion toward the upper end 2a of the spherical shell 2 through the other end or upper end of the member 7, and the light from the remaining LED light source body 5b is transmitted to each light transmitting member 7 as much as possible. Since the light extraction to the side of the light transmitting member is intensified by hitting the concave and convex portion 7a, the intensity is increased on the side facing the spherical shell 2, so that the degree of illumination to the side of the spherical shell 2 as a whole Even if an LED light source body that is reinforced and features straight travel is used as a light bulb Without lowering the illumination of the lateral, it can be made uniform illumination.

  In addition, in this embodiment, although the structure which set the number of the LED light source bodies which belong to each light transmission member 7 to three was shown, according to the illumination intensity | strength of a light bulb calculated | required, the number may be set arbitrarily. Can do.

  Further, in FIG. 2, the number of cylindrical light transmission members arranged in the spherical shell 2 is six, but four as shown in the modification shown in FIG. 3 or FIG. As in the other modification examples shown in FIG. 3, three can be configured, and the number of the three can be arbitrarily set according to the illumination intensity required as a light bulb. Furthermore, in any number of configurations, the outer periphery of each cylindrical light transmission member 7 contacts or engages at the outer periphery adjacent to each other, and also contacts or engages with the inner peripheral surface of the spherical shell. A structure is desirable. As a result, the light transmission member 7 can be kept in its position without requiring any separate fixing means by mutual engagement and engagement with the spherical shell 2, and the assembling work is extremely facilitated.

  As mentioned above, although embodiment of the LED light bulb which concerns on this invention, and its modification were demonstrated, this invention is not limited to these structures, Furthermore, a various deformation | transformation structure can also be included. For example, the LED light source body described in the present application is not limited to a normal LED (light emitting diode) light source body, but should be understood to include a straight light source or a similar light source body having directivity.

It is a principal part fracture | rupture front view of the LED bulb of one Embodiment which concerns on this invention. It is a cross-sectional view which follows the AA line of FIG. It is the cross-sectional view showing the modification which concerns on this invention which varied the number of the light transmission members arrange | positioned in a spherical shell similarly to FIG. FIG. 5 is a cross-sectional view showing another modified example according to the present invention in which the number of light transmission members arranged in a spherical shell is further varied in the same manner as in FIGS. 2 and 3.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 LED bulb 2 Spherical shell 3 Base 4 Board | substrate 5,5a, 5b LED light source body 7 Light transmission member 7a Uneven part

Claims (3)

In an LED bulb comprising a transparent or translucent spherical shell, a base attached to one end of the spherical shell, and an LED light source body disposed in the spherical shell,
A plurality of the LED light source bodies disposed so as to emit light along the longitudinal axis of the LED bulb, and a substrate provided on the base;
One end is placed on the substrate side, and the other end is arranged to extend in parallel with each other along the longitudinal axis of the LED bulb in the spherical shell, and the LED light source body is faced at the one end, respectively. And a plurality of transparent or semi-transparent cylindrical light transmission member provided along the longitudinal direction of the concave and convex portion for irregularly reflecting the light from the LED light source body on the inner peripheral surface,
LED bulb comprising   A plurality of the LED light source bodies face one end of each cylindrical light transmission member, and at least one LED light source body among the plurality of LED light source bodies respectively belonging to each cylindrical light transmission member is provided. 2. The LED light bulb according to claim 1, wherein, in the cross section of the cylindrical light transmission member, the LED light bulb is positioned at a substantially central portion thereof, and another LED light source body is displaced in a direction toward the spherical shell. . The outer circumference of each cylindrical light transmission member is brought into contact with the outer circumference of an adjacent cylindrical light transmission member, and further, the outer circumference of these cylindrical light transmission members is brought into contact with the inner circumferential surface of the spherical shell. Thus, the LED light bulb according to claim 1 or 2, wherein the cylindrical light transmission member is assembled in a fixed state in the spherical shell.

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