JP2011129388A - Bulb type led lamp - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bulb type LED lamp that enhances luminous efficiency and light distribution uniformity. <P>SOLUTION: The bulb type LED lamp includes a plurality of LEDs 4, a lighting circuit 8 for lighting LEDs 4, a housing 5 in which at least a part of lighting circuit 8 is contained, and two or more light-emitting diodes 4 are arranged around on one face, a base 6 arranged on the other side of the housing 5 and connected to the lighting circuit 8, and a light guiding object globe 1 having a shape of convex body covering one face of the housing 5. The light guiding object globe 1 has an incident light section 3 provided at an end for receiving incident light from multiple light-emitting diodes 4, and a reflection pattern 2 reflecting the incident light on an inner surface. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a bulb-type LED lamp, and more particularly to a lamp structure.

  A bulb-type LED lamp having a conventional structure is described in, for example, Japanese Patent Application Laid-Open No. 2009-37995. As seen in the figure of the publication, LEDs are arranged on the upper surface of a casing which is an extension of the base, and a hemispherical globe having light diffusibility is arranged thereon.

  The light diffusing glove is necessary to soften the light from the LED. If the diffusibility is weak, the light intensity from the LED becomes strong, and the light is felt brightly in a portion where the light is strong. Further, in the case of a high-power LED, there is a risk of causing eye damage when viewed directly. On the other hand, when the light diffusibility is strong, there is a problem that the amount of components that absorb light increases in the globe, resulting in poor consumption efficiency as a lighting device.

  Further, in a light bulb-type LED lamp having a conventional structure, a circuit for lighting is arranged inside the housing as shown in the figure of JP 2009-37995 A, but a limited space However, it is necessary to select and arrange parts in consideration of heat dissipation, which causes a cost increase. In addition, when sufficient heat dissipation is not obtained, there is a problem that the reliability of the circuit component is lowered and the life is short.

JP 2009-37995 A

  An object of the present invention is to provide a light bulb shaped LED lamp having improved luminous efficiency and light distribution uniformity.

In order to achieve the above object, the present invention provides the following bulb-type LED lamp.
(1) A plurality of LEDs, a lighting circuit for lighting the LEDs, a housing in which at least a part of the lighting circuit is housed and the plurality of LEDs are arranged around one surface side, and the housing A base that is disposed on the other surface side of the body and connected to the lighting circuit, and a convex curved body shape that covers one surface side of the housing, and receives light from the plurality of LEDs. A light bulb-type LED lamp comprising a light guide globe having an incident surface on an end surface and a reflection pattern on an inner surface for reflecting the incident light.
(2) The light bulb-shaped LED lamp according to (1), wherein the reflection pattern of the light guide globe is formed denser as the position is farther from the light incident portion.
(3) The reflection pattern of the light guide globe is formed at a position farther from the light incident portion than a structural portion outside the one surface of the casing. 2) The light bulb-shaped LED lamp described above.
(4) The reflection pattern of the light guide globe is formed at a position separated from the light incident part by a dimension equal to or larger than the width dimension of the light incident part. The bulb-type LED lamp according to any one of the above.
(5) The light bulb-type LED lamp according to any one of (1) to (4), wherein the light guide globe is formed so that a thickness of the light guide globe decreases as the distance from the light incident portion increases. .
(6) The structure according to (1) to (1), wherein the one surface of the housing has a structure that receives an end surface of the light guide plate globe at a stepped portion and maintains a distance between the LED and the light incident portion. (5) The bulb-type LED lamp according to any one of (5).
(7) The bulb-type LED lamp according to (6), wherein the structure has an inclination on a side closer to the LED than the stepped portion.
(8) The bulb-type LED lamp according to any one of (1) to (7), wherein a reflecting member that reflects light is disposed inside the light guide globe.
(9) The bulb-type LED lamp according to (8), wherein the reflecting member has a structure in thermal contact with the housing.
(10) The bulb-type LED lamp according to (8) or (9), wherein the reflecting member is formed of white-coated aluminum.
(11) The bulb-type LED lamp according to (8) or (9), wherein the reflecting member is formed of ceramics.
(12) The light bulb-shaped LED lamp according to (8) or (9), wherein the reflecting member is formed of a composite of ceramics and metal.
(13) The light bulb-type LED lamp according to any one of (1) to (12), wherein the light guide globe has a spherical body shape that is not less than a hemispherical body as the convex curved body shape.
(14) The light bulb shaped LED lamp according to any one of (1) to (13), wherein the light guide globe has a constricted portion extending in the direction of the cap.
(15) The bulb-type LED lamp according to any one of (1) to (14), wherein a part of the lighting circuit is disposed in an inner space of the light guide globe.

  According to the present invention, a light bulb shaped LED lamp with improved luminous efficiency and light distribution uniformity can be obtained. Further, it is possible to obtain a bulb-type LED lamp that prevents the lighting circuit from being increased in cost and has improved reliability and life.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows Example 1 of the lightbulb-type LED lamp which concerns on this invention, (a) is a perspective view, (b) is A-A 'sectional drawing in (a). (A), (b) is a figure which each shows the enlarged view of a light-guide body globe edge part. FIG. 3 is a cross-sectional view corresponding to A-A ′ of FIG. 1, showing a second embodiment of the light bulb shaped LED lamp according to the present invention. (A), (b) is a figure which each shows the enlarged view of a light-guide body globe edge part, and is a figure which shows Example 3 of the lightbulb-shaped LED lamp which concerns on this invention. It is A-A 'corresponding sectional drawing of FIG. 1 which shows Example 4 of the lightbulb-shaped LED lamp which concerns on this invention. It is a figure which shows Example 5 of the lightbulb-type LED lamp which concerns on this invention, (a) is a perspective view, (b) is A-A 'sectional drawing in (a). FIG. 7 is a cross-sectional view corresponding to A-A ′ in FIG. 6, showing a sixth embodiment of the light bulb shaped LED lamp according to the present invention.

  Embodiments of a light bulb shaped LED lamp according to the present invention will be described below. A typical example is a light bulb shaped LED lamp having an E26 type cap, but the present invention is not limited to this. The reference numerals described in the drawings are all common numerals in each embodiment described below. In each figure, reference numeral 1 is a light guide globe, 2 is a reflection pattern, 3 is a light incident part, 4 is an LED, 5 is a housing, 6 is a base, 7 is a space for a lighting circuit, and 8 is a lighting circuit. , 9 is a reflecting member, 10 is a stepped portion, 11 is a slope, 12 is an insulator, and 13 is a constricted portion of a light guide globe.

  1A and 1B are diagrams showing Embodiment 1 of a light bulb shaped LED lamp according to the present invention, in which FIG. 1A is a perspective view and FIG. 1B is a cross-sectional view taken along line A-A ′ in FIG. In the present embodiment, as shown in the drawing, a plurality of LEDs 4, a lighting circuit 8 for lighting the LEDs 4, and at least a part of the lighting circuit 8 are accommodated, and the plurality of LEDs 4 are arranged around one surface side. A housing 5, a base 6 disposed on the other surface side of the housing 5 and connected to the lighting circuit 8; a light guide globe 1 having a convex curved body shape covering one surface side of the housing 5; Is provided. The light guide globe 1 has a light incident portion 3 that receives light from the plurality of LEDs 4 on its end surface and a reflection pattern 2 that reflects incident light on its inner surface. It is preferable that the reflection pattern 2 of the light guide globe 1 is formed denser as the position is farther from the light incident portion 3. Moreover, it is preferable that the reflective pattern 2 is formed at a position farther from the light incident portion than the structural portion outside the one surface of the housing 5. In the present embodiment, the convex curved body shape of the light guide globe 1 is generally a hemispherical body shape as shown in the figure, but is not limited thereto. Moreover, a part of the lighting circuit 8 can be protruded from the inside of the housing 5 and disposed in the inner space of the light guide globe 1 as illustrated. The details will be described below.

  In the figure, the housing 5 is insulated from the base 6 by an annular insulator 12 and is formed on the extension of the central axis of the base 6 by, for example, aluminum die casting. A plurality of LEDs 4 are insulated from the housing 5 on the outer periphery of the housing 5 and arranged on a circumferential substrate with a substantially uniform interval, and the LEDs 4 are lit using a connector disposed on the substrate. The lighting circuit 8 is electrically connected, and is further electrically connected to the base 6 via the lighting circuit 8. A space 7 for a lighting circuit is formed in the housing 5 as shown in the figure.

  In the substantially hemispherical light guide globe 1, the width of the light incident part 3, which is its end face, is 5 mm, for example, wider than the LED 4 so that the light emitted from the LED 4 can be evenly incident. In addition, the light incident portion 3 is arranged so as to be almost directly above the LED 4. A reflection pattern 2 is formed on the inner surface of the light guide globe 1 having a substantially hemispherical shape so that the light of the incident LED is reflected and emitted to the outside of the light guide globe 1. The reflection pattern 2 is formed so as to become denser as it goes farther from the light incident portion 3 so that the light emitted to the outside has a uniform intensity when viewed from the outside of the light guide globe 1. Further, the reflection pattern 2 is separated from the height position of the ridge of the housing 5 by, for example, 5 millimeters as shown in FIG. 2A in order to prevent the reflected light from being reflected inside the housing 5. Is formed from the place. According to the inventor's trial production, the height position where the reflection pattern 2 is formed is preferably started from the same level or more as the width of the light incident portion 3, and when the reflection pattern 2 is formed at a low position, FIG. It has been confirmed that the light component reflected inside the housing 3 increases as shown in FIG. Thus, it is preferable that the reflection pattern 2 of the light guide globe 1 is formed at a position separated from the light incident part 3 by a dimension equal to or larger than the width dimension of the light incident part 3.

  In a bulb-type LED lamp having such a structure, compared with a bulb-type LED lamp having a conventional structure, the diffusion material is mixed into the globe and the diffusion material is applied to the inside of the globe in order to reduce the sensation of the LED. Therefore, the light absorption loss to the diffusing material is reduced, and the light emission efficiency can be improved. Moreover, it was confirmed that the amount of light absorption loss to the substrate or the like due to repeated reflection of light inside the globe was reduced, and the consumption efficiency was improved. Furthermore, the light distribution uniformity can be improved by forming the reflection pattern denser as the position is farther from the light incident portion.

  Further, as compared with a light bulb shaped LED lamp having a conventional structure, a space can be secured inside the globe, so that the lighting circuit 8 needs to be housed in the housing 5 and the base 6. Compared to a bulb-type LED lamp, it can also be arranged using the space inside the globe. According to the prototype of the inventor, in the case of a light bulb-type LED lamp having an E26 base, when the light guide globe 1 is substantially hemispherical, a space inside the globe is added, which is 1.7 compared to the conventional structure. Double space was obtained. As a result, it is possible to provide a margin between the components of the lighting circuit 8 and the arrangement interval of the components, thereby reducing the necessity of using small heat-resistant components that are generally expensive. In addition, it has become possible to reduce the progress of deterioration of components such as semiconductors and capacitors that are mainly driven by heat.

  FIG. 3 is a cross-sectional view corresponding to A-A ′ in FIG. 1, showing a second embodiment of the light bulb shaped LED lamp according to the present invention. As shown in the figure, the thickness of the light guide globe 1 is formed so as to become thinner as the distance from the light incident portion 3 increases. In this embodiment, the thickness is about 1 millimeter at the center of the globe farthest from the light incident portion 3. As a result, it was confirmed that the light absorption loss due to repeated reflection of light inside the globe was reduced and the consumption efficiency was improved. Moreover, the mass of the light guide globe 1 was reduced by about 40%, and the weight of the bulb-type LED lamp was reduced. In addition, it is possible to provide a margin for the interval between the components of the lighting circuit 8 and the components.

  Fig.4 (a) is an enlarged view of the light-guide globe end part which shows Example 3 of the lightbulb-type LED lamp based on this invention. As shown in the drawing, at the joint portion between the light guide globe 1 and the housing 5, the inner surface side of the housing 5 near the LED 4 of the housing 5 is thinner than the light incident portion 3 of the light guide globe 1. The step part 10 was provided so as to be. That is, one surface of the housing 5 has a structure in which the end surface of the light guide plate globe 1 is received by the step portion 10 and the distance between the LED 4 and the light incident portion 3 is maintained. This can prevent pressure from being directly applied to the LED 4 from the light guide globe, which helps to improve the reliability of the LED element. In addition, there is an effect of keeping the distance between the LED 4 and the light incident part 3 of the light guide globe 1 constant, and the uniformity of light emitted from the light guide globe 1 toward the outside is increased. Moreover, FIG.4 (b) is an enlarged view of the light-guide globe end part which shows another Example of the lightbulb-shaped LED lamp which concerns on this invention. As shown in the figure, at the joint portion between the light guide globe 1 and the housing 5, it opens toward the light incident part 3 of the light guide globe 1 on the inner surface side of the housing 5 near the LED 4 of the housing 5. Such an inclination 11 was provided. That is, this structure has an inclination 11 on the side closer to the LED 4 than the step portion 10. As a result, in addition to the effect of FIG. 4A, an effect of condensing the light emitted from the LED 4 toward the light incident part 3 was obtained, and the consumption efficiency could be increased.

  FIG. 5 is a cross-sectional view corresponding to A-A ′ of FIG. 1 showing Embodiment 4 of the light bulb shaped LED lamp according to the present invention. As shown in the drawing, a reflecting member 9 obtained by pressure-molding white PET in a shape along the inner surface shape is disposed inside the light guide globe 1. This has the effect of reducing the rate at which the light from the LED 4 that has entered the light guide globe 1 escapes to the inside of the light guide globe 1, thereby further improving the light emission efficiency. The material of the reflecting member 9 is not limited to this. For example, white painted aluminum is used as the reflecting member 9 and, as shown in FIG. 5, by adopting a structure in which the housing 5 and the reflecting member 9 are in thermal contact with each other, radiation via the reflecting member 9 is caused. Heat dissipation was also possible, the speed of deterioration of the components of the lighting circuit 8 due to heat could be reduced, and the reliability and life of the bulb-type LED lamp could be improved. According to the inventor's trial production, a heat dissipation performance of about 1.7 times that of the conventional structure in which most of the heat generated from the LED 4 and the lighting circuit 8 is radiated through the path from the housing 5 to the air is achieved. Was confirmed. Thus, although the present Example arrange | positions the reflective member 9 which reflects light inside the light guide globe 1, it is preferable that the reflective member 9 has a structure which contacts the housing | casing 5 thermally. .

  6A and 6B are diagrams showing Embodiment 5 of a light bulb shaped LED lamp according to the present invention, in which FIG. 6A is a perspective view and FIG. 6B is a cross-sectional view taken along line A-A ′ in FIG. In the present embodiment, as shown in the figure, the light guide globe 1 has a substantially spherical shape. As a result, a round light bulb shape could be realized as the light distribution of the light emitted from the light guide globe 1. According to the inventor's prototype, by making the light guide globe 1 substantially spherical, the space inside the globe becomes larger, and a space about 2.4 times larger than the conventional structure could be obtained. . Thus, in the present embodiment, the light guide globe 1 has a spherical body shape that is not less than a hemispherical body as a convex curved body shape.

  FIG. 7 is a cross-sectional view corresponding to A-A ′ of FIG. 6, showing a sixth embodiment of the light bulb shaped LED lamp according to the present invention. In this embodiment, as shown in the figure, the light guide globe 1 having a substantially spherical shape is extended in the direction of the base 3 along the housing 5 in the vicinity of the joint of the light guide globe 1 with the housing 5. The constricted part 13 was provided in the light guide globe 1, and the reflection pattern 2 was formed from the constricted part 13. As a result, a light distribution closer to a light bulb shape could be realized as a light distribution of the light emitted from the light guide globe 1. Thus, in this embodiment, the light guide globe 1 has the constricted portion 13 extending in the direction of the base 6.

  In the present invention, the light guide globe 1 is made of transparent acrylic and the reflection pattern 2 on the inner surface is formed by laser processing. However, the present invention is not limited to this. For example, the light guide globe 1 is formed by injection molding or silk printing. Even if formed, the same effect can be obtained. In the present invention, the thickness of the globe has been described as 5 millimeters. However, it is possible to make the thickness of the globe thinner by using a small LED. Moreover, although the formation position of the reflective pattern 2 was demonstrated as 5 millimeters from the height position of the ridge of the housing | casing 5, when the thickness of a glove is thin, a height position can be made low. The material of the light guide globe 1 is not limited to transparent acrylic, and may be, for example, a transparent resin such as polycarbonate or polystyrene, or glass. Further, the light guide globe 1 may not be completely transparent as long as the light of the LED 4 can be emitted to the outside by the reflection pattern 2. In the present embodiment, the shape of the light guide globe 1 has been described in two examples as a substantially hemispherical shape and a substantially spherical shape, but is not limited thereto, and is not limited to a polygonal combination. It does n’t matter.

  The housing 5 is made of an aluminum material by die casting, but the material is not limited to aluminum, and may be another metal such as zinc or a steel plate, a ceramic material, or a resin. Moreover, you may form by manufacturing methods, such as cutting, extrusion, and bending, and those combinations.

  The LED 4 has been described with an example in which a plurality of LEDs 4 are arranged on a circumferential substrate at approximately equal intervals. However, the circumferential shape is not essential and is arranged so as not to be detached from the light incident part 3 of the light guide globe 1. Just do it. Each LED 4 may be fixed to the housing 5 by wiring with a flexible substrate, a connector, or the like. Moreover, the same effect can be obtained even if an LED manufactured in a circumferential shape from the beginning is used.

In this embodiment, the reflective member 9 is formed by pressure molding of white PET. However, the reflective member 9 can be formed of ceramics or a composite of ceramics and metal in addition to the above-described white-coated aluminum. A material having high diffuse reflectance such as white ceramics or a composite thereof is desirable. As a composite of ceramics and metal, for example, the inside is made of metal and the outside (light guide globe side) is made of ceramic, heat transfer is made of metal, and heat dissipation and light reflection are made of ceramic (white). However, the present invention is not limited to this.
In the present embodiment, the configuration in which white-coated aluminum is bonded to the housing 5 as the reflective member 9 having heat transfer properties and heat radiation has been described, but the housing and the reflective member are made of the same material as the housing 5. Can be formed as a single member by means such as injection molding. Although the application example of the reflecting member 9 has been described in the embodiment having a substantially hemispherical shape, the same optical effect and heat dissipation effect can be obtained even in the case of a light guide globe having a substantially spherical shape.

  In this embodiment, a bulb-type LED lamp having an E26 type cap has been described as a representative example, but a bulb-type LED lamp having a globe can obtain the effects of the present invention regardless of the shape of the cap. The configurations shown in the above embodiments can be used in combination with each other, and the combination effect can be obtained.

DESCRIPTION OF SYMBOLS 1 Light guide globe 2 Reflection pattern 3 Light entrance part 4 LED
5 Housing 6 Base 7 Space for Lighting Circuit 8 Lighting Circuit 9 Reflecting Member 10 Stepped Part 11 Inclined 12 Insulator 13 Constriction of Light Guide Globe

Claims (15)

  A plurality of LEDs, a lighting circuit for lighting the LEDs, a housing in which at least a part of the lighting circuit is housed and the plurality of LEDs are arranged around one surface side, and the other of the housings A base that is disposed on the surface side of the light source and connected to the lighting circuit, and a convex curved body that covers one surface side of the housing, and a light incident portion that receives light from the plurality of LEDs And a light guide globe having a reflection pattern on the inner surface for reflecting the incident light.   The light bulb shaped LED lamp according to claim 1, wherein the reflection pattern of the light guide globe is formed denser as the position is farther from the light incident portion.   The light bulb shape according to claim 1 or 2, wherein a reflection pattern of the light guide globe is formed at a position farther from the light incident portion than a structural portion outside the one surface of the casing. LED lamp.   The reflective pattern of the said light guide body globe is formed in the position away from the said light entrance part only by the dimension more than the width dimension of the said light entrance part. Light bulb shaped LED lamp.   The light bulb-shaped LED lamp according to any one of claims 1 to 4, wherein the light guide globe is formed so that a thickness of the light guide globe decreases as the distance from the light incident portion increases.   The one surface of the said housing | casing has a structure which receives the end surface of the said light-guide plate glove in a level | step-difference part, and hold | maintains the space | interval between the said LED and the said light-incidence part. The light bulb shaped LED lamp described in 1.   The bulb-type LED lamp according to claim 6, wherein the structure has an inclination on a side closer to the LED than the stepped portion.   The light bulb shaped LED lamp according to any one of claims 1 to 7, wherein a reflecting member that reflects light is disposed inside the light guide globe.   The bulb-type LED lamp according to claim 8, wherein the reflecting member has a structure in thermal contact with the casing.   10. The light bulb shaped LED lamp according to claim 8, wherein the reflecting member is made of white painted aluminum.   10. The light bulb shaped LED lamp according to claim 8, wherein the reflecting member is made of ceramics.   The bulb-type LED lamp according to claim 8 or 9, wherein the reflecting member is formed of a composite of ceramics and metal.   The light-bulb-shaped LED lamp according to any one of claims 1 to 12, wherein the light guide globe has a spherical body shape that is not less than a hemispherical body as the convex curved body shape.   The light bulb-type LED lamp according to any one of claims 1 to 13, wherein the light guide globe has a constricted portion extending in the direction of the cap.   The bulb-type LED lamp according to any one of claims 1 to 14, wherein a part of the lighting circuit is disposed in an inner space of the light guide globe.

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