LED filament lamp
By employing a flip-chip eutectic fixing chip in LED filament lamps and coating phosphor inside the bulb housing or mixing it with a ceramic sheet, the problems of insufficient brightness and high heat in LED filament lamps are solved, achieving high luminous efficiency and reliability, and making it a viable replacement for sodium lamps.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-03
- Publication Date
- 2026-03-31
AI Technical Summary
Existing LED filament lamps are not bright enough to replace high-brightness sodium lamps, and the large amount of phosphor leads to heat accumulation, resulting in poor product reliability.
LED flip chips are fixed using a flip-chip eutectic method, and phosphor is coated inside the bulb housing or mixed into a ceramic sheet. Light is guided by a light guide post to excite white light, and heat is reduced by a metal heat sink.
It achieves high luminous efficacy, improves the reliability of LED filament lamps, and can replace sodium lamps in various applications.
Smart Images
Figure CN224065328U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of LED technology, and in particular to an LED filament lamp. Background Technology
[0002] LED filaments are used to replace filaments in traditional lighting fixtures (such as tungsten filament lamps). Previously, to achieve a certain illuminance and illuminated area, LED light sources required the addition of optical devices such as lenses, which affected the lighting effect and reduced the energy-saving efficiency of LEDs. LED filaments, however, achieve 360° omnidirectional and wide-angle light emission without the need for lenses, creating a three-dimensional light source. The white light produced by LED filament lamps is achieved through color conversion. Yellow or tri-color phosphors are mixed with silicone and coated to encapsulate a blue LED chip. This allows the yellow or tri-color phosphors to mix and produce white light when excited by blue light.
[0003] In the current technology, the brightness of LED filament lamps can only reach 20,000 LM, which cannot replace the large-volume 100,000 LM sodium lamps. Traditional sodium lamps have a large color temperature requirement, and the luminous efficacy of existing LED filament lamps with a color temperature of 1800K is very low. The large amount of phosphor leads to high powder temperature, which causes heat accumulation on the LED chip and poor product reliability. Utility Model Content
[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide an LED filament lamp, which aims to solve the technical problem of poor reliability of LED filament lamp products in the existing technology.
[0005] To achieve the above objectives, this utility model is implemented through the following technical solution: an LED filament lamp, including a lamp head and a bulb housing disposed on one side of the lamp head, the LED filament lamp further including a heat dissipation substrate disposed on the side of the lamp head near the bulb housing, an LED flip chip fixed on the heat dissipation substrate by a flip-chip eutectic method, and a light-transmitting element disposed on one side of the light-emitting surface of the LED flip chip, the light-transmitting element being provided with phosphor, the light-transmitting element being spaced apart from the LED flip chip, and the LED filament lamp further including a light guide post disposed on one side of the light-emitting surface of the LED flip chip.
[0006] According to one aspect of the above technical solution, the LED filament lamp further includes a cup disposed on the heat dissipation substrate and a lens disposed on the side of the cup away from the LED flip chip.
[0007] According to one aspect of the above technical solution, the light-transmitting element is a ceramic sheet disposed between the lens and the bowl, and the phosphor is mixed in the ceramic sheet.
[0008] According to one aspect of the above technical solution, the light-transmitting element is a coating disposed on the bulb housing, the coating being disposed on the side of the bulb housing near the light guide post, and the phosphor being mixed in the coating.
[0009] According to one aspect of the above technical solution, the lamp holder includes a lamp holder body and a metal heat sink disposed on one side of the lamp holder body.
[0010] According to one aspect of the above technical solution, the phosphor is a yellow phosphor or a tri-color phosphor.
[0011] According to one aspect of the above technical solution, the bulb housing is made of glass.
[0012] According to one aspect of the above technical solution, the bulb housing is elliptical in shape.
[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: by coating phosphor into the bulb housing or uniformly mixing it into the ceramic sheet, instead of coating and wrapping the blue LED flip chip with phosphor, the remote phosphor technology and LED flip chip are combined inside the entire bulb housing, which solves the problems of low luminous efficiency and high heat leading to poor reliability. High luminous efficiency can be achieved, realizing the application scenario of LED filament lamp replacing sodium lamp. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the LED filament lamp in the first embodiment of this utility model;
[0015] Figure 2 This is a schematic diagram of the LED filament lamp in the second embodiment of this utility model;
[0016] Figure 3 This is a schematic diagram of the structure of the LED flip chip, heat dissipation substrate, lens and ceramic sheet in the second embodiment of this utility model;
[0017] Explanation of key component symbols:
[0018] 11. Lamp base; 12. Bulb housing; 13. Light guide column; 14. Metal heat sink; 21. LED flip chip; 22. Heat sink substrate; 23. Lens; 31. Coating; 32. Ceramic sheet.
[0019] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this utility model. Detailed Implementation
[0020] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. Several embodiments of this utility model are shown in the drawings. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this utility model will be more thorough and complete.
[0021] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.
[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.
[0023] Please see Figure 1 The image shows an LED filament lamp according to the first embodiment of the present invention, including a lamp head 11 and a bulb housing 12 disposed on one side of the lamp head 11. The LED filament lamp also includes a heat dissipation substrate 22 disposed on the side of the lamp head 11 near the bulb housing 12, an LED flip chip 21 fixed on the heat dissipation substrate 22 by a flip-chip eutectic method, and a light-transmitting element disposed on one side of the light-emitting surface of the LED flip chip 21. The light-transmitting element is provided with phosphor. The light-transmitting element and the LED flip chip 21 are spaced apart. The LED filament lamp also includes a light guide post 13 disposed on one side of the light-emitting surface of the LED flip chip 21.
[0024] Specifically, in this embodiment, the LED filament lamp further includes a cup disposed on the heat dissipation substrate 22, and a lens 23 disposed on the side of the cup away from the LED flip chip 21. The light-transmitting element is a coating 31 disposed on the bulb housing 12, the coating 31 being disposed on the side of the bulb housing 12 near the light guide post 13, and the phosphor being mixed in the coating 31.
[0025] In some application scenarios of this embodiment, the LED flip chip 21 is first fixed onto the heat sink substrate 22 by eutectic bonding, thus completing the installation of the LED flip chip 21; a fluorescent coating formed by mixing phosphor and coating 31 slurry is sprayed onto the inner wall of the glass bulb housing 12, and then sintered at high temperature to form a uniform coating 31 with phosphor; blue light is guided to the coating 31 area through the light guide post 13 to excite and form white light. Preferably, the phosphor is yellow phosphor or tri-color phosphor; the bulb housing 12 is elliptical in shape.
[0026] Preferably, in this embodiment, the lamp holder 11 includes a lamp holder body and a metal heat sink 14 disposed on one side of the lamp holder body. By providing a metal heat sink 14 at the lamp holder 11, the heat generated by the LED flip chip 21 during operation can be reduced, heat accumulation can be avoided, and product reliability can be improved.
[0027] In summary, the LED filament lamp in the above embodiments of this utility model, by coating phosphor into the bulb housing 12 through coating 31 and spacing the phosphor and LED flip chip 21 apart, instead of coating and wrapping the blue LED flip chip 21 with phosphor, combines remote phosphor technology and LED flip chip 21 inside the entire bulb housing, solving the problems of low luminous efficiency and high heat leading to poor reliability, can achieve high luminous efficiency, and realize the application scenario of LED filament lamp replacing sodium lamp.
[0028] Please refer to Figures 2 to 3 The image shows an LED filament lamp in the second embodiment of this utility model. The difference between the LED filament lamp in this embodiment and the LED filament lamp in the first embodiment is as follows:
[0029] The light-transmitting element is a ceramic sheet 32 disposed between the lens 23 and the bowl, and the phosphor is mixed in the ceramic sheet 32.
[0030] In some application scenarios of this embodiment, by mixing phosphor and ceramic powder at a ratio of 1:8, pressing them into sheets, and then sintering them at high temperature (1000°C, 2 hours) to form a fluorescent ceramic sheet 32, which is placed below the lens 23 above the bowl, and blue light is uniformly diffused to the fluorescent ceramic sheet 32 through the light guide column 13, thus exciting and generating white light.
[0031] In summary, the LED filament lamp in the above embodiments of this utility model, by uniformly mixing phosphor in the ceramic sheet 32 and placing it between the cup and the lens 23, and by spacing the phosphor and the LED flip chip 21 apart, instead of coating and wrapping the blue LED flip chip 21 with phosphor, combines remote phosphor technology and LED flip chip 21 inside the bulb housing 12, solving the problems of low luminous efficiency and high heat leading to poor reliability, can achieve high luminous efficiency and realize the application scenario of LED filament lamp replacing sodium lamp.
[0032] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0033] The above-described embodiments are merely illustrative of several implementations of this utility model, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this utility model. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the appended claims.
Claims
1. An LED filament lamp characterized in that, The LED filament lamp comprises a lamp cap, a bulb shell arranged on one side of the lamp cap, a heat dissipation substrate arranged on a side of the lamp cap close to the bulb shell, an LED flip chip fixed on the heat dissipation substrate in a flip eutectic manner, and a light-transmitting piece arranged on a light-emitting surface of the LED flip chip.
2. The LED-filament lamp of Claim 1, wherein, The LED filament lamp further comprises a bowl cup arranged on the heat dissipation substrate, and a lens arranged on a side of the bowl cup away from the LED flip chip.
3. The LED-filament lamp of Claim 2, wherein, The light-transmitting piece is a ceramic sheet arranged between the lens and the bowl cup, and the fluorescent powder is mixed in the ceramic sheet.
4. The LED-filament lamp of Claim 1, wherein, The light-transmitting piece is a coating layer arranged on the bulb shell, the coating layer is arranged on a side of the bulb shell close to the light guide column, and the fluorescent powder is mixed in the coating layer.
5. The LED-filament lamp of Claim 1, wherein, The lamp cap comprises a lamp cap body and a metal heat sink arranged on one side of the lamp cap body.
6. The LED-filament lamp of Claim 1, wherein, The fluorescent powder is yellow fluorescent powder or three-primary-color fluorescent powder.
7. The LED-filament lamp of Claim 1, wherein, The bulb shell is made of glass.
8. The LED-filament lamp of Claim 7, wherein, The bulb shell is arranged in an elliptical shape.