EP3444521B1

EP3444521B1 - Led bulb having light guide body

Info

Publication number: EP3444521B1
Application number: EP17192393.1A
Authority: EP
Inventors: Huanxing Zhao
Original assignee: Changzhou Fuxing Electrical Applicance Co Ltd
Current assignee: Changzhou Fuxing Electrical Applicance Co Ltd
Priority date: 2017-08-16
Filing date: 2017-09-21
Publication date: 2021-05-05
Anticipated expiration: 2037-09-21
Also published as: EP3444521A1; DK3444521T3

Description

BACKGROUND

Technical Field

The invention relates to an LED bulb having a light guide body, and belongs to the field of lighting technologies.

Related Art

At present, lighting bulbs commonly used in the market are mostly formed by patches or strips of incandescent bulbs and ordinary LED bulbs. The incandescent bulbs have a filament support in a bulb shell, and glow by using a filament on the filament support. The incandescent bulbs have disadvantages of a short life of a filament, a complex production process, high manufacture costs, and low production efficiency. The ordinary LED bulbs have the similar production process manufacture problem, and also cannot achieve a decorative effect of the incandescent bulbs. Therefore, people use an LED bulb having a light guide body. A bottom of the light guide body is in contact with a luminous body, and depending on total internal reflection, light is transmitted in the light guide body. The light guide body is generally made of optical materials such as acrylic polyester, polycarbonate, epoxy resin, and glass. A light guide effect of the light guide body made of the foregoing materials is still unsatisfactory, and a lighting effect is affected. Some can only be used as decorative bulbs, and cannot reach a lighting requirement. US 2014/355292 A1 to Krause Gabriel, published on Dec 4, 2014 shows an LED bulb having a light guide body in the state of the art. US 2017/038029 A1 to Deng Jinhong, published on Feb 9, 2017 shows_another LED bulb having a light guide body in the state of the art. WO 2010/110652 A1 to Eldolab Holding Bv and Welten Petrus Johannes Maria, published on Sep 30, 2010 shows another LED bulb having a light guide body in the state of the art. CN 101956918 A to Shenzhen Anzhen Optical Products Co Ltd, published on Jan 26, 2011 shows another LED bulb having a light guide body in the state of the art. US 2016/238776 A1 to Lan Pinghai , published on Aug 18, 2016 shows another LED bulb having a light guide body in the state of the art. WO 2015/018852 A1 to Koninklijke Philips NV, published on Feb 12, 2015 also shows another LED bulb having a light guide body in the state of the art.

SUMMARY

An objective of the invention is to provide an LED bulb that has a light guide body and that can both provide light and have a decorative effect.
To resolve the foregoing technical problem, the technical solutions of the invention are:
An LED bulb having a light guide body includes a bulb holder, a bulb shell, a luminous body, a power source, a connector, and a light guide body. The connector is fixedly connected to the bulb holder, the bulb shell is fixed on the connector, the luminous body and the power source are located in the bulb holder, the luminous body and the power source are connected by using a wire, a lower end of the light guide body is plugged with the connector, and a bottom of the light guide body is in contact with the luminous body, where the light guide body is engraved with glyphs, wherein the light guide body is a hollow cylinder. A top terminal end surface of the light guide body has a wavy shape defined by a surface that extends substantially perpendicularly to a longitudinal axis of the light guide body, the surface is flat in a radial direction of the light guide body and has a plurality of alternating peaks and valleys with transitional sloped portions therebetween along a circumferential direction of the light guide body.
Further, an outer wall of the light guide body is engraved with spiral glyphs.
Further, an outer wall of the light guide body is engraved with glyphs arranged in a V shape. Further, the luminous body is an LED luminous body.
In a variant which does not form part of the claimed invention, a top of the light guide body is in a rhombus shape.
Further, outer threads are disposed with on the connector, and the bulb shell and the connector are connected by using the threads.
Further, a first fastener used for connecting to the light guide body is disposed inside the connector.
Further, a second fastener is disposed inside the connector, and a heat dissipation piece connected to the second fastener is disposed inside the bulb holder.
After the foregoing technical solutions are used, because a light guide body is engraved with glyphs, light glow and light guide effects may be enhanced by using the glyphs, to ensure that the lightness reaches a lighting requirement. At the same time, the glyphs can further have a decorative effect. Compared with an incandescent bulb, a service life of a bulb is prolonged, and compared with an ordinary LED bulb, a manufacture process is simplified, and manufacture costs are reduced. In addition, a top of the light guide body is in a wavy shape and may have a light gathering effect, thereby resolving a problem of glowing at the top of the light guide body, and making the entire bulb body glow evenly and softly.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a three-dimensional view of a first structure of an LED bulb having a light guide body according to the invention;
FIG. 2 is a schematic sectional view of FIG. 1;
FIG. 3 is a three-dimensional view of a second structure of an LED bulb having a light guide body according to the invention;
FIG. 4 is a schematic sectional view of FIG. 3.

In the figures, 1. Power source, 2. Second fastener, 3. Luminous body, 4. Light guide body, 5. Glyphs, 6. Bulb shell, 7. Connector, 8. First fastener, 9. Heat dissipation piece, 10. Bulb holder.

DETAILED DESCRIPTION

To make the content of the invention understood more easily, the following further describes the invention in detail according to specific embodiments and with reference to the accompanying drawings.

Embodiment 1

As shown in FIG. 1 and FIG. 2, an LED bulb having a light guide body includes a bulb holder 10, a bulb shell 6, a luminous body 3, a power source 1, a connector 7, and a light guide body 4. The connector 7 is fixedly connected to the bulb holder 10, the bulb shell 6 is connected to the connector 7 by using threads, the luminous body 3 and the power source 1 are located in the bulb holder 10, the luminous body 3 is an LED luminous body, and the luminous body 3 and the power source 1 are connected by using a wire. A lower end of the light guide body 4 is plugged with the connector 7, and a bottom of the light guide body 4 is in contact with the luminous body 3. The light guide body 4 is a hollow cylinder, the light guide body 4 is engraved with spiral glyphs 5, and a top terminal end surface of the light guide body 4 is in a wavy shape defined by a surface that extends substantially perpendicularly to a longitudinal axis of the light guide body 4. the surface is flat in a radial direction of the light guide body 4 and has a plurality of alternating peaks and valleys with transitional sloped portions therebetween along a circumferential direction of the light guide body 4. In a variant not claimed, the top of the light guide body 4 may also be in a rhombus shape. The top of the light guide body 4 uses the wavy shape or the rhombus shape and may have a light gathering effect, thereby resolving a problem of glowing at the top of the light guide body 4, and making the entire bulb body glow evenly and softly.
As shown in FIG. 2, a first fastener 8 used for connecting to the light guide body 4 is disposed inside the connector 7. The first fastener 8 facilitates the connection between the light guide body 4 and the connector 7, and may ensure close connection between them, without generating a shaking phenomenon.
As shown in FIG. 2, a second fastener 2 is disposed inside the connector 7, and a heat dissipation piece 9 connected to the second fastener 2 is disposed in the bulb holder 10. The heat dissipation piece 9 is configured to dissipate heat inside the bulb holder 10, and prevent excessively high temperature in the bulb holder 10.

Embodiment 2

As shown in FIG. 3 and FIG. 4, an LED bulb having a light guide body includes a bulb holder 10, a bulb shell 6, a luminous body 3, a power source 1, a connector 7, and a light guide body 4. The connector 7 is fixedly connected to the bulb holder 10, the bulb shell 6 is connected to the connector 7 by using threads, the luminous body 3 and the power source 1 are located in the bulb holder 10, the luminous body 3 is an LED luminous body, and the luminous body 3 and the power source 1 are connected by using a wire. A lower end of the light guide body 4 is plugged with the connector 7, and a bottom of the light guide body 4 is in contact with the luminous body 3. The light guide body 4 is a hollow cylinder, the light guide body 4 is engraved with glyphs 5 arranged in a V shape, and a top terminal end surface of the light guide body 4 is in a wavy shape defined by a surface that extends substantially perpendicularly to a longitudinal axis of the light guide body 4. The surface is flat in a radial direction of the light guide body 4 and has a plurality of alternating peaks and valleys with transitional sloped portions therebetween along a circumferential direction of the light guide body 4. In a variant not claimed, the top of the light guide body 4 may also be in a rhombus shape. The top of the light guide body 4 uses the wavy shape or the rhombus shape, and may have a light gathering effect, thereby resolving a problem of glowing at the top of the light guide body 4, and making the entire bulb body glow evenly and softly.
As shown in FIG. 4, a first fastener 8 used for connecting to the light guide body 4 is disposed inside the connector 7. The first fastener 8 facilitates the connection between the light guide body 4 and the connector 7, and may ensure close connection between them, without generating a shaking phenomenon.
As shown in FIG. 4, a second fastener 2 is disposed inside the connector 7, and a heat dissipation piece 9 connected to the second fastener 2 is disposed in the bulb holder 10. The heat dissipation piece 9 is configured to dissipate heat inside the bulb holder 10, to prevent excessively high temperature in the bulb holder 10.
The foregoing specific embodiments further describe the objective, the technical solutions, and the beneficial effect of the invention in detail. It should be understood that, the foregoing descriptions are only specific embodiments of the invention, and are not used for limiting the invention. Particularly, the form of glyphs is not limited to be arranged in the thread shape in Embodiment 1 and the V shape in Embodiment 2. The shape of a light guide body is limited to a cylinder, however, in variants which do not form part of the claimed invention, it may also be in rhombus, square, and strip shapes, or may be made into a light guide plate. In addition to the spiral shape and the V shape, the glyphs may also be shapes of other forms.

Claims

An LED bulb having a light guide body, comprising a bulb holder (10), a bulb shell (6), a luminous body (3), a power source (1), a connector (7), and a light guide body (4), wherein the connector (7) is fixedly connected to the bulb holder (10), the bulb shell (6) is fixed on the connector (7), the luminous body (3) and the power source (1) are located in the bulb holder (10), the luminous body (3) and the power source (1) are connected by using a wire, a lower end of the light guide body (4) is plugged with the connector (7), and a bottom of the light guide body (4) is in contact with the luminous body (3), wherein the light guide body (4) is a hollow cylinder; characterized in that the light guide body (4) is engraved with glyphs (5); and
a top terminal end surface of the light guide body (4) has a wavy shape defined by a surface that extends substantially perpendicularly to a longitudinal axis of the light guide body (4), the surface is flat in a radial direction of the light guide body (4) and has a plurality of alternating peaks and valleys with transitional sloped portions therebetween along a circumferential direction of the light guide body (4).
The LED bulb having a light guide body according to claim 1, characterized in that an outer wall of the light guide body (4) is engraved with spiral glyphs (5).
The LED bulb having a light guide body according to claim 1, characterized in that an outer wall of the light guide body (4) is engraved with glyphs (5) arranged in a V shape.
The LED bulb having a light guide body according to claim 1 or 2 or 3, characterized in that the luminous body (3) is an LED luminous body.
The LED bulb having a light guide body according to claim 1 or 2 or 3, characterized in that outer threads are disposed on the connector (7), and the bulb shell (6) and the connector (7) are connected by using the threads.
The LED bulb having a light guide body according to claim 1 or 2 or 3, characterized in that a first fastener (8) used for connecting to the light guide body (4) is disposed inside the connector (7).
The LED bulb having a light guide body according to claim 1 or 2 or 3, characterized in that a second fastener (2) is disposed inside the connector (7), and a heat dissipation piece (9) connected to the second fastener (2) is disposed in the bulb holder (10).