JP2010040364A - Light source for illumination - Google Patents

Abstract

The light distribution angle is made closer to that of an incandescent bulb than in the past.
A heat sink member 16 as a base includes a mounting portion 16b on which a light emitting module 20 is mounted and a peripheral portion 16a surrounding the periphery of the mounting portion 16b. The surface of the peripheral portion 16a is the surface of the mounting portion 16b. It falls in a direction perpendicular to the surface of the mounting portion 16b with respect to the surface. An annular light guide member 30 is arranged so as to surround the light emitting unit 22 of the light emitting module 20. An inner peripheral surface 30b that serves as a light incident surface of the light guide member 30 is located around the light emitting unit 22, and at least a part of the outer peripheral surface 30c that serves as a light output surface of the light guide member 30 is a mounting portion. In the direction perpendicular to the surface of 16b, it is located closer to the base than the periphery of the light emitting portion 22.
[Selection] Figure 3

Description

  The present invention relates to an illumination light source to which a light emitting module such as an LED module is applied, and more particularly to a technique for improving light distribution characteristics.

In recent years, technologies for applying light emitting elements such as LEDs to illumination light sources have been researched and developed in the illumination field, and as part of this, application to bulb-type illumination light sources that replace incandescent bulbs is also being considered. The basic configuration of a light bulb-shaped illumination light source is mounted on a light emitting module mounted on a base, a lighting circuit for the light emitting module, a case for fixing the base and housing the lighting circuit, a glove that covers the light emitting module, and a case It is a base. The light emitting module is composed of a mounting substrate and a light emitting portion, and the light emitting portion is composed of a resin molded body containing a light emitting element and a phosphor.
JP 2004-49211 A JP 2004-207688 A JP 2005-209545 A JP 2006-92915 A

Incandescent light bulbs can extract light in almost all directions, not only in the front but also to the side and back, except for some areas that are shaded by the base. For this reason, incandescent light bulbs are used in various forms. For example, many lighting fixtures that attach incandescent light bulbs sideways and extract light from the side are also used.
On the other hand, in the above-described light bulb-shaped illumination light source, the light emitting part is disposed on the mounting substrate and the mounting substrate is disposed on the base, so that light can be extracted at an angle of ± 90 ° or less from the front. However, at an angle of ± 90 ° or more, almost no light can be extracted due to a shadow on the mounting substrate or base. Therefore, there exists a subject that it cannot substitute for an incandescent lamp in a specific utilization aspect like the above-mentioned lighting fixture.

  Therefore, an object of the present invention is to provide an illumination light source capable of bringing the light distribution angle closer to that of an incandescent bulb than ever before.

  An illumination light source according to the present invention is an illumination light source in which a light emitting module is mounted on a base, wherein the base includes a mounting portion on which the light emitting module is mounted and a peripheral portion around the mounting portion. And the surface of the peripheral portion falls in a direction perpendicular to the surface of the mounting portion with respect to the surface of the mounting portion, and an annular light guide member surrounds the periphery of the light emitting portion of the light emitting module. An inner peripheral surface that is disposed in the light guide member and is a light incident surface of the light guide member is positioned around the light emitting portion of the light emitting module, and is a peripheral surface of at least a part of the outer peripheral surface that is the light output surface of the light guide member Is positioned closer to the base than the periphery of the light emitting part of the light emitting module in a direction perpendicular to the surface of the mounting portion.

  According to the above configuration, part of the light emitted from the light emitting module is taken in from the inner peripheral surface of the light guide member and emitted from the outer peripheral surface of the light guide member. At this time, since at least a part of the outer peripheral surface of the light guide member is located closer to the base than the periphery of the light emitting part, a part of the light emitted from the light guide member is behind the light emitting part. It is emitted at an angle (an angle of ± 90 ° or more from the front). Therefore, light can be extracted even at an angle of ± 90 ° or more from the front, and the light distribution angle can be made closer to that of an incandescent bulb than in the past.

The best mode for carrying out the present invention will be described in detail with reference to the drawings.
<Outline configuration>
FIG. 1 is an exploded perspective view showing a configuration of an illumination light source according to an embodiment of the present invention. FIG. 2 is a cross-sectional view showing the configuration of the illumination light source according to the embodiment of the present invention.
As shown in FIGS. 1 and 2, the illumination light source 1 includes a case 11, a power supply circuit 12, an E-type base 15, a heat sink member 16, a light emitting module 20, a light guide member 30, and a globe 40. The case 11 has a bowl shape and houses a power supply circuit 12 in the bowl. The power supply circuit 12 includes a circuit board 13 and various electronic components 14, and has a function of supplying power supplied to the light emitting module 20 through an E-type base 15 protrudingly formed on the case 11. Note that the wiring for supplying power is not shown because it is not an essential part of the present invention. The heat sink member 16 is fixed in a state where the opening of the bowl-shaped case 11 is sealed. The light emitting module 20 includes a mounting substrate 21 and a light emitting unit 22, and is mounted on the heat sink member 16 via a bonding material 23. That is, the heat sink member 16 functions as a base on which the light emitting module 20 is mounted. The light emitting unit 22 emits light upon receiving power supply from the power supply circuit 12, and specifically, a blue LED and a silicone resin containing a yellow phosphor material formed so as to contain the blue LED. It is comprised from a molded object. The light guide member 30 has an annular shape and is disposed so as to surround the light emitting unit 22. The globe 40 covers the light emitting module 20 and the light guide member 30 and is fixed to the heat sink member 16.
<Detailed configuration>
Next, the main part of the light source for illumination is demonstrated. FIG. 3 is a cross-sectional view showing a main part of the illumination light source according to the embodiment of the present invention.

  The heat sink member 16 includes a mounting portion 16b on which the light emitting module 20 is mounted and a peripheral portion 16a around the mounting portion 16b. The surrounding portion 16a falls in a direction perpendicular to the surface of the mounting portion 16b (the mounting surface of the light emitting module 20) with respect to the mounting portion 16b. That is, the heat sink member 16 has a shape in which the periphery of the mounting portion 16b is removed from the surface in an annular shape (the upper portion of the surface of the peripheral portion 16a is a lacking portion). In the present embodiment, the surface of the peripheral portion 16a is substantially parallel to the surface of the mounting portion 16b, and a step is generated between the surface of the peripheral portion 16a and the surface of the mounting portion 16b.

  The light guide member 30 has a shape in which a concave portion is provided on one main surface of the disc, and a rectangular opening 30a penetrating to the other main surface is provided in a part of the concave portion. The inner diameter of the recessed portion is larger than the outer diameter of the mounting portion 16 b, and the inner periphery of the rectangular opening 30 a is larger than the outer periphery of the light emitting unit 22. The light guide member 30 is disposed such that the main surface provided with the recessed portion faces the surface of the heat sink member 16, and is fixed to the peripheral portion 16 a by the bonding material 34. The recessed portion of the light guide member 30 surrounds the mounting portion 16 b, and the opening 30 a of the light guide member 30 surrounds the light emitting portion 22. In other words, the heat sink member 16 is arranged in a form that compensates for a part of the lacking portion.

  The light guide member 30 is configured by forming a light reflection film 32 and a light diffusion film 33 on the surface of the light guide resin molded body 31. The light guide resin molded body 31 is made of, for example, a light guide material such as acrylic resin, polycarbonate resin, or silicone resin. The light reflecting film 32 is made of, for example, a light reflecting material such as white ink or a metal thin film, and is provided on the upper and lower surfaces of the light guide resin molded body 31. The light diffusion film 33 is made of, for example, a resin containing a light diffusion material such as silica, and is provided on the outer peripheral surface of the light guide resin molded body 31.

  Since the light emitting unit 22 is accommodated in the opening 30a of the light guide member 30, the inner peripheral surface 30b of the light guide member 30 is a light incident surface, and the outer peripheral surface 30c of the light guide member is a light emitting surface. That is, a part of the light emitted from the light emitting unit 22 is taken in from the inner peripheral surface 30b which is a light incident surface and is emitted from the outer peripheral surface 30c which is a light emitting surface. The outer peripheral surface 30 c of the light guide member 30 has a peripheral surface 30 d positioned around the light emitting unit 22 and a peripheral surface 30 e closer to the heat sink member than the periphery of the light emitting unit 22. Further, the width of the outer peripheral surface 30c in the direction perpendicular to the surface of the mounting portion 16b is larger than the width of the inner peripheral surface 30b. Therefore, a part of the light emitted from the light guide member is emitted at a rear angle (an angle of ± 90 ° or more from the front) with respect to the light emitting unit. In addition, since the light diffusion film 33 is provided on the outer peripheral surface 30c of the light guide member 30, the light distribution angle dependency of the emitted light can be suppressed and uniform light distribution characteristics can be obtained.

  In the present embodiment, when the base 21a of the light emitting unit 22 is used as a reference, the height h2 of the upper surface of the light guide member 30 is at least one time h1 from the base 21a of the light emitting unit 22 to the tip 22a. It is assumed that it is 2 times or less (see the enlarged view in FIG. 3). By setting it as such a range, it can suppress as much as possible that the shadow by the light guide member 30 forms diagonally forward, ensuring a certain amount of the light which injects into the light guide member 30. FIG.

Moreover, in this embodiment, since the inner peripheral surface 30b of the light guide member 30 is closer to the light emitting unit 22 than the outer periphery of the mounting portion 16b, the light emitted obliquely forward from the light emitting unit 22 can be efficiently captured. it can.
<Modification>
Next, a modification of the above embodiment will be described. In the embodiment, the light reflecting resin molded body 31 is provided with the light reflecting film 32 in order to increase the light reflection efficiency. However, as shown in FIG. 4, the reflecting dots 35 are provided in place of the light reflecting film 32. You may do that. Similar to the light reflecting film 32, the reflecting dots 35 can be made of a light reflecting material such as white ink or a metal thin film. Moreover, it is good also as improving the reflective efficiency of light by giving a specific reflective pattern to the surface of the light guide resin molding 31. FIG. The light reflection film 32 or the reflection dots 35 are not necessarily provided on both the upper and lower surfaces of the light guide resin molded body 31, and may be provided on either one of the upper or lower surfaces. It is good also as not being provided in either. Even if the light reflection film 32 and the reflection dots 35 are not present, a certain degree of light reflection efficiency can be obtained due to the difference in refractive index between the light guide resin molded body 31 and the surrounding gas.

  In addition, as shown in FIG. 5, a translucent member 24 may be inserted in a gap between the light emitting unit 22 and the inner peripheral surface of the light guide member 30. The translucent member 24 can be formed by disposing the light emitting module 20 and the light guide member 30, filling the gap between them with a translucent resin having fluidity, and then curing the resin. it can. By providing the translucent member 24, the light incident efficiency on the light guide member 30 can be increased. In FIG. 5, the upper surface of the translucent member 24 is formed flat, but it may be formed into a convex lens shape instead.

  Further, as shown in FIG. 6, a light distribution control lens 25 may be combined with the light emitting unit 22. The light distribution control lens 25 reduces the amount of light emitted forward, and increases the amount of light emitted laterally by that amount. By combining such lenses, the amount of light incident on the light guide member 30 can be increased, and the amount of light emitted backward can be increased accordingly.

  Further, as shown in FIG. 7, the peripheral portion 16d of the heat sink member 16 is dropped into a slope shape with respect to the mounting portion 16c, and the shape of the recessed portion 30f of the light guide member 30 is formed so as to match the shape of this slope. It is good to do. Even in such a shape, since at least a part of the outer peripheral surface of the light guide member 30 is located closer to the heat sink member than the periphery of the light emitting portion 22, the same effect as in the embodiment can be obtained. . In the embodiment, the mounting portion 16b and the peripheral portion 16a are provided with two steps, but the same applies to the case where two or more steps are provided.

  Further, as shown in FIG. 8, the shape of the light guide member 30 may be a cylindrical shape having an inner circumference of a certain size. In this case, the inner periphery of the light guide member 30 is set to a dimension capable of fitting the mounting portion 16b. Thus, the light guide member 30 can be easily manufactured by simplifying the shape of the light guide member 30. In the example of FIG. 8, the light distribution control lens 25 is provided, but this lens is not an essential component. For example, a cylindrical light guide member is attached to a light emitting module without a lens as shown in FIG. It may be applied.

  Further, as shown in FIG. 9, the light guide member 30 may be arranged so that the light emitting module is sandwiched between the light guide member 30 and the mounting surface of the mounting member 16b. FIG. 9A is a top view of the light emitting module, and FIG. 9B is a cross-sectional view showing an installed state of the light emitting module and the light guide member. On the mounting substrate 21, a light emitting unit 22 and a wiring pattern 26 serving as a power feeding part of the light emitting unit 22 are arranged. A flexible wiring 27 is connected to the wiring pattern 26. In this example, the mounting substrate 21 is sandwiched between the light guide member 30 and the mounting surface of the mounting member 16b with the bonding material 23 and the flexible wiring 27 interposed therebetween. In this configuration, since the light emitting module is pressed against the heat sink member by the light guide member 30, it is possible to prevent deterioration of thermal coupling due to warpage of the mounting substrate 21 or the like. The pressing force by the light guide member 30 can be obtained by the joining force of the joining material 34 that joins the light guide member 30 and the heat sink member 16. Alternatively, it is also possible to apply a pressing force to the light emitting module by providing a screw structure at a joint portion between the light guide member 30 and the heat sink member 16 and tightening the light guide member 30.

In the embodiment, the light diffusion film 33 is provided on the outer peripheral surface of the light guide member 30. However, the outer peripheral surface itself has a light diffusion function, such as roughening the outer peripheral surface of the light guide member 30. The same effect can be obtained. Furthermore, it is the same as providing a light diffusing function in a region facing the outer peripheral surface of the light guide member 30 in the globe 40.
In the embodiment, the light guide member 30 is fixed to the surface of the peripheral portion 16a by the bonding material 34. However, the light guide member 30 is not limited to this and is fixed to the light emitting module 20 or the globe 40 and floats from the surface of the peripheral portion 16a. It is good to be.

In the embodiment, the light emitting unit 22 has a quadrangular prism shape, but is not limited thereto, and may be a cylindrical shape or a polygonal column shape other than a square shape. If it is cylindrical, the light distribution characteristic in the circumferential direction of the light emitting part 22 can be made uniform.
In the embodiment, the mounting portion 16b of the heat sink member 16 has a columnar shape, but is not limited thereto, and may be a polygonal column shape such as a square column shape.

  Moreover, in embodiment, although the light emission part 22 combines blue LED as a light emitting element, and yellow fluorescent substance as a wavelength conversion material, it is not restricted to this. For example, a combination of an ultraviolet light emitting diode and phosphors emitting three primary colors (red, green, and blue) can be used. Further, a light emitting transistor or an organic EL may be used as the light emitting element. Further, a material containing a substance that emits light having a wavelength different from the light absorbed and absorbed, such as a semiconductor, a metal complex, an organic dye, or a pigment, may be used as the wavelength conversion material.

  The present invention can be widely used in general lighting.

The disassembled perspective view which shows the structure of the light source for illumination which concerns on embodiment of this invention. Sectional drawing which shows the structure of the light source for illumination which concerns on embodiment of this invention Sectional drawing which shows the principal part of the light source for illumination which concerns on embodiment of this invention Sectional drawing which shows the principal part of the light source for illumination which concerns on the modification which changed a part of embodiment Sectional drawing which shows the principal part of the light source for illumination which concerns on the modification which changed a part of embodiment Sectional drawing which shows the principal part of the light source for illumination which concerns on the modification which changed a part of embodiment Sectional drawing which shows the principal part of the light source for illumination which concerns on the modification which changed a part of embodiment Sectional drawing which shows the principal part of the light source for illumination which concerns on the modification which changed a part of embodiment It is a figure which shows the principal part of the light source for illumination which concerns on the modification which changed a part of embodiment, (a) is a top view of a light emitting module, (b) is a cross section which shows the arrangement | positioning state of a light emitting module and a light guide member Figure

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Illumination light source 11 Case 12 Power supply circuit 13 Circuit board 14 Electronic component 15 E-type base 16 Heat sink member 16a Peripheral part 16b Mounting part 16c Mounting part 16d Peripheral part 20 Light emitting module 21 Mounting board 22 Light emitting part 23 Bonding material 24 Translucency Member 25 Light distribution control lens 26 Wiring pattern 27 Flexible wiring 30 Light guide member 30a Opening 30b Inner peripheral surface 30c Outer peripheral surface 30d Peripheral surface 30e located on the periphery of the light emitting unit on the outer peripheral surface 30e Out of the outer peripheral surface on the periphery of the light emitting unit Peripheral surface near heat sink member 31 Light guide resin molded body 32 Light reflection film 33 Light diffusion film 34 Bonding material 35 Reflection dot 40 Globe

Claims (8)

A light source for lighting with a light emitting module mounted on a base,
The base includes a mounting portion on which the light emitting module is mounted, and a peripheral portion around the mounting portion, and a surface of the peripheral portion is on a surface of the mounting portion with respect to a surface of the mounting portion. Is depressed in the vertical direction,
An annular light guide member is disposed so as to surround the light emitting portion of the light emitting module,
An inner peripheral surface serving as a light incident surface of the light guide member is located around a light emitting portion of the light emitting module, and at least a part of a peripheral surface serving as a light emitting surface of the light guide member is the mounting surface. An illumination light source characterized by being positioned closer to the base than the periphery of the light emitting part of the light emitting module in a direction perpendicular to the surface of the part.   The light source for illumination according to claim 1, wherein a width of the outer peripheral surface of the light guide member in a direction perpendicular to the mounting portion is larger than a width of the inner peripheral surface of the light guide member. The light guide member has a shape in which a concave portion is provided on one main surface of a flat plate, and an opening penetrating to the other main surface is provided in a part of the concave portion,
The light guide member is disposed such that a main surface provided with the recessed portion faces the base, a mounting portion of the base is surrounded by the recessed portion of the light guide member, and the light emitting module emits light. The illumination light source according to claim 2, wherein the portion is surrounded by an opening of the light guide member.   The height of the other main surface with respect to the base of the light emitting unit of the light emitting module is 1 to 2 times the height from the base of the light emitting unit to the tip. The illumination light source according to claim 3.   The light source for illumination according to claim 1, wherein a translucent member is interposed in a gap between the light emitting portion of the light emitting module and the inner peripheral surface of the light guide member.   The light source for illumination according to claim 1, wherein an outer peripheral surface of the light guide member has a light diffusion function.   A glove that covers the light emitting module and the light guide member is disposed in a peripheral portion of the base, and a region facing the outer peripheral surface of the light guide member in the glove has a light diffusion function. The illumination light source according to claim 1. A light source for lighting with a light emitting module mounted on a base,
The base has a shape in which the periphery of the mounting portion on which the light emitting module is mounted lacks in an annular shape from the surface,
An annular light guide member having a shape part that compensates for at least part of the lacking part of the base is arranged in a form that compensates for at least part of the lacking part of the base,
An inner surface of the light guide member is a light incident surface, faces the periphery of the light emitting part of the light emitting module, and an outer surface of the light guide member is a light emitting surface. Light source.

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