CN1796864A

CN1796864A - Led bulb

Info

Publication number: CN1796864A
Application number: CNA2005101340478A
Authority: CN
Inventors: C·M·库谢恩; T·特斯诺
Original assignee: Osram Sylvania Inc
Current assignee: Osram Sylvania Inc
Priority date: 2004-12-27
Filing date: 2005-12-27
Publication date: 2006-07-05
Anticipated expiration: 2025-12-27
Also published as: CN100559056C

Abstract

An LED light source (10) has a housing (12) having a base (14). A hollow core (16) projects from the base (14) and is arrayed about a longitudinal axis (18). A printed circuit board (20) is positioned in the base (14) at one end (22) of the hollow core (16) and has a plurality of LEDs (24) operatively fixed thereto about the center thereof. In a preferred embodiment of the invention the hollow core (16) is tubular and the printed circuit board (20) is circular. A light guide (28) with a body (30) that, in a preferred embodiment, is cup-shaped as shown in Figs. 2 and 4a, has a given wall thickness ''T''. The light guide (28) is positioned in the hollow core (16) and has a first end (32) in operative relation with the plurality of LEDs (24) and a second end (34) projecting beyond the hollow core. The thickness ''T'' is at least large enough to encompass the emitting area of the LEDs that are employed with it.

Description

Led bulb

Technical field

The present invention relates to light source, and particularly relate to the light source that adopts light emitting diode (LED), and particularly relate to light sources such as the head lamp that is used for automotive field for example, taillight, stop light, fog lamp, turn signal, and particularly, the present invention relates to pack so that realize the light source of industrial acceptable interchangeability.

Background technology

In the past, most of vehicle light sources relate to use incandescent lamp foam.Though work is good and cheap, these foams have the short relatively life-span, and certain filament that adopts is always owing to vibration is ruptured.

Particularly some occasion of stop light replaces by LED in recent years.These solid state light emitters have the incredible life-span, in 1000000 hours scope, and are not easy owing to vibration was lost efficacy.But these LED sources have been hardwired on its appropriate location, have increased installation cost.If therefore can provide a kind of led light source more more convenient to install, will be very big progress so in the art than incandescent light source.If can provide the industrial acceptable interchange standard of a kind of realization, will be bigger progress so in the art so that substitute described incandescent lamp foam.

Developed this light source, and the LED that combines with optical fiber or other photoconduction of their employings sometimes, so that concentrate the light of a plurality of LED, perhaps with required mode disperse light.Described a kind of such light source in the patent application serial number 10/899546 in common examination, this patent was submitted on December 20th, 2004, and transferred assignee of the present invention.The described light source in back adopts a plurality of photoconductions that form one-one relationship with the LED of same quantity.Though this configuration effort is good, its cost height, and need a large amount of parts, all parts need suitable accurate in locating.

If the photoconduction of LED and simple form can be made together and be used for developing a kind of light source, will be that another is progressive so in the art.

Summary of the invention

Therefore, the objective of the invention is to eliminate the defective of prior art.

Another object of the present invention is to improve the operation of light source.

Another purpose of the present invention is to provide a kind of simple and cheap light-guiding system that is used for light source.

In one aspect of the invention, these purposes realize that by a kind of led light source is provided this light source comprises: the housing with base; From the hollow core that described base stretches out, described hollow core is arranged around longitudinal axis; Be positioned in the described base and have the printed circuit board (PCB) of operationally fixing a plurality of LED on it around its periphery at an end of described hollow core; Photoconduction with main body, main body have given wall thickness and are positioned in the described hollow core, and have the relevant first end and stretch out the second end above described hollow core in operation with described a plurality of LED; Become the fin of heat conduction relation location with described printed circuit board (PCB); And be connected to first reflector on the second end of described photoconduction.Use single photoconduction to reduce the quantity of parts and reduce assembly cost then.In a preferred embodiment of the invention, hollow core and photoconduction are circular, therefore the problem that reduces to locate.

Description of drawings

Fig. 1 is the plane of the embodiment of the invention;

Fig. 2 is the sectional view along the line 2-2 intercepting of Fig. 1;

Fig. 3 is the perspective view that rotates the embodiment of the invention of 180 degree;

Fig. 4 a is the perspective view that can be used for photoconduction embodiment of the present invention;

Fig. 4 b can be used for the perspective view that photoconduction of the present invention can be selected embodiment; And

Fig. 4 c is the partial section of first reflector that is used for the embodiment of Fig. 4 b.

The specific embodiment

In order better to understand the present invention and other and further purpose, advantage and ability, in conjunction with the accompanying drawings, with reference to following disclosure and claims.

Now more especially with reference to the accompanying drawings, expression led light source 10 among Fig. 1 and 2, light source comprises the housing 12 with base 14.Hollow core 16 stretches out from base 14, and arranges around longitudinal axis 18.At hollow core 16 1 ends, printed circuit board (PCB) 20 is positioned in the base 14.In a preferred embodiment of the invention, hollow core 16 is tubuloses, and led array is circular.The photoconduction 28 that has the main body 30 of the cup-shaped shown in Fig. 2 and the 4a in a preferred embodiment has given wall thickness " T ".Photoconduction 28 is positioned in the hollow core 16, and has the relevant first end 32 and stretch out the second end 34 above hollow core in operation with a plurality of LED24.Thickness " T " is at least enough big, so that surround the emitting area of employed LED.Preferably, first end 32 is near the location and randomly form major part (if not all) light of intercepting and capturing from the LED24 emission, so that be directed to photoconduction 28.

Fin 36 is located to concern with 20 one-tenth heat conduction of described printed circuit board (PCB), and first reflector 38 is connected on the second end 34 of photoconduction 28.Suitable fin is illustrated in the U.S. Patent Application Serial Number 10/838090 in the common examination, and this patent was submitted on May 3rd, 2004, and transferred assignee of the present invention, and the content of this patent is in conjunction with therewith as a reference.

Preferred photoconduction 28 has the second end 34 that stretches out, this end is formed with the outer dia D1 less than the outer dia D of main body 30, and first reflector 38 is provided with recess 40, and this recess surrounds diameter D1, so that cooperate with the second end 34 of photoconduction 28 with press fit relation.

Select among the embodiment of the present invention, photoconduction 28a can be a tubulose, and the first reflector 38a can be formed with protuberance 40a, and this protuberance cooperates and is installed in the openend of photoconduction 28a.

Light source 10 forms in the existing aperture that is installed in second reflector 42, and second reflector 42 has the reflecting surface 44 of the reflecting surface 46 on first reflector 38 and the 38a.

LED24 preferably is arranged to annular, so that it is spread out mutually, helps cooling thus.Simultaneously, photoconduction 28 forms the pipe with optical axis.Pipe has input window at the first end of bridge joint LED, intercepts and captures the light that the LED sidepiece is directly launched thus in a photoconduction.

Preferably,

photoconduction

28,28a have the circumferential seat 50 that is formed on first end 32 places, so that guarantee the relation that suitably separates with LED24.In addition, first end 32 can have the flange 52 that is formed on around it, and this flange can be provided for the receiving area of the pad 54 between the end 22 of flange 52 and hollow core 16.

The outer surface of hollow core 16 can be provided with fastening lug 56, so that light source 10 is bonded in second reflector 42, as known.Equally, connector 58 can be arranged on the main body 16 that contains electric contact 60, so that will offer printed circuit board (PCB) 20 and LED24 from the required electric power of external source.

As shown in the figure, in operation, be fed to first reflector 38 or the 38a via

public photoconduction

28 or 28a from the light of LED24.Light reflects back into the reflecting surface 44 of second reflector 42 from emitting surface 46, and arrives the zone that will throw light on forward.Reflecting

surface

44 and 46 can be chosen adjusting wantonly, so that determine preferred output beam pattern.Each reflecting surface is specific exchange part for specific beam pattern, and remaining lamp partly is the parts of standard.

But if can remove required

reflector

38 or 38a, and light can directly be launched from foam.Foam can adopt lens or other structure so, so that the output of customization light.

Use single shaping photoconduction significantly to reduce the quantity of required parts and simplification assembling greatly.In a preferred embodiment, hollow core 16 and

photoconduction

28 or 28a are columniform, have eliminated positioning step.

In addition, photoconduction can be made by the molded acrylic material of for example Albis Opitx CA-41 or CA-75.

Adopt single photoconduction to help structure and optical alignment.Do not need a plurality of photoconductions location and supporting separately.

Though illustrate and described and thought currently preferred embodiments of the present invention, those skilled in the art will appreciate that and to carry out different remodeling and modification, and do not depart from the scope of the present invention that is defined by the following claims.

Claims

1. led light source comprises:

Housing with base;

From the hollow core that described base stretches out, described hollow core is arranged around longitudinal axis;

Be positioned in the described base and have the printed circuit board (PCB) of operationally fixing a plurality of LED on it around its periphery at an end of described hollow core;

Photoconduction with main body, main body have given wall thickness and are positioned in the described hollow core, and have the relevant first end and stretch out the second end above described hollow core in operation with described a plurality of LED;

Become the fin of heat conduction relation location with described printed circuit board (PCB); And

Be connected to first reflector on the second end of described photoconduction.

2. led light source as claimed in claim 1 is characterized in that described photoconduction is a tubulose.

3. led light source as claimed in claim 1 is characterized in that described photoconduction is a cup-shape, and is that the second end has the diameter less than described main diameter.

4. led light source as claimed in claim 3 is characterized in that, described first reflector has indented central portion, and this recess surrounds the diameter of described the second end.

5. led light source as claimed in claim 2 is characterized in that, described first reflector has protuberance, and this protuberance is installed in described tubulose photoconduction inside.

6. led light source as claimed in claim 1 is characterized in that, second reflector is located around described base, and has towards the reflecting surface of the reflecting surface of described first reflector.