# US 8,465,177 B2 · Heat dissipation enhanced LED lamp > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,465,177 B2 - Document ID: US8465177B2 - Status: Granted - Kind: B2 - Application number: 12/457,718 - Filed: 2009-06-19 - Published: 2010-12-23 - Granted: 2013-06-18 - Earliest claimed: 2009-06-19 - Applicants: Chih-Ming Yu - Inventors: Chih-Ming Yu - Web page: https://patentgrep.com/patent/US8465177B2 ## CPC - F21V 3/00: Globes; Bowls; Cover glasses (with refracting properties F21V5/00; with reflecting properties F21V7/00; characterised by cooling arrangements F21V29/506) - F21K 9/232: specially adapted for generating an essentially omnidirectional light distribution, e.g. with a glass bulb - F21V 29/83: the elements having apertures, ducts or channels, e.g. heat radiation holes - F21V 23/02: the elements being transformers, impedances {or power supply units, e.g. a transformer with a rectifier} - F21Y 2115/10: Light-emitting diodes [LED] - F21V: FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR - F21K: NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR - F21Y: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED ## Abstract A LED lamp which could directly replace an ordinary tungsten, halogen, or electricity-saving light bulb includes a filament, a lamp base and a thermally conductive electric insulator. The filament includes at least one AC LED device, and the thermally conductive electric insulator is filled in a cavity of the lamp base to mechanically contact with the filament and an electrode of the lamp base. When the AC LED device is powered on, the thermally conductive electric insulator provides a thermal channel to transfer heat from the filament to the electrode for heat dissipation enhancement. The LED lamp can be directly inserted into an ordinary bulb socket that is generally used in lighting fixtures, without having to modify the system of the lighting fixtures or use an additional adapter. ## Claims ### Claim 1 A light emitting diode (LED) lamp, comprising: an LED filament including an LED device; a lamp base defining a cavity therein and having a first electrode and a second electrode; a resistor connected in series with the LED device between the first and second electrodes; and a thermally conductive electric insulator filling up the cavity defined by the lamp base and mechanically contacting with the LED filament and the first electrode to provide a thermal channel to transfer heat from the LED device to the first electrode for heat dissipation enhancement when the LED device is powered on. ### Claim 2 (depends on 1) The LED lamp of claim 1, wherein the circuit board is soldered to the first electrode. ### Claim 3 (depends on 1) The LED lamp of claim 1, wherein the thermally conductive member has a flange sandwiched between the LED device and the circuit board. ### Claim 4 (depends on 1) The LED lamp of claim 1, wherein the circuit board has a glass fiber reinforced substrate. ### Claim 5 (depends on 1) The LED lamp of claim 1, wherein the LED device has a plastic leaded chip carrier package structure. ### Claim 6 (depends on 1) The LED lamp of claim 1, wherein the resistor is mounted on the circuit board. ### Claim 7 (depends on 1) The LED lamp of claim 1, wherein the LED filament comprises a circuit board soldered to the first electrode and having the LED device mounted thereon. ### Claim 8 (depends on 7) The LED lamp of claim 7, wherein the circuit board comprises: an aluminum metal layer in mechanical contact with the thermally conductive electric insulator; a copper metal layer having the LED device soldered thereon; and a thermally conductive layer sandwiched between the aluminum metal layer and the copper metal layer. ### Claim 9 (depends on 7) The LED lamp of claim 7, wherein the LED device has a chip on board package structure. ### Claim 10 (depends on 7) The LED lamp of claim 7, wherein the resistor is mounted on the circuit board. ### Claim 11 (depends on 1) The LED lamp of claim 1, wherein the thermally conductive electric insulator comprises an epoxy resin, thermal conductor powder, or a mixture thereof. ### Claim 12 (depends on 1) The LED lamp of claim 1, wherein the resistor is buried in the thermally conductive electric insulator. ### Claim 13 (depends on 1) The LED lamp of claim 1, wherein the LED device is configured to operate at an AC voltage ranging from 12 V to 240 V. ### Claim 14 (depends on 1) The LED lamp of claim 1, wherein a rated power of the LED device ranges from 1 W to 3 W. ### Claim 15 (depends on 1) The LED lamp of claim 1, further comprising a lamp cover encapsulating the LED filament. ### Claim 16 (depends on 15) The LED lamp of claim 15, wherein the lamp cover comprises a glass cap, a plastic cap, an epoxy resin cap, or a silicone cap. ### Claim 17 (depends on 1) The LED lamp of claim 1, wherein the lamp base is a standard lamp base for ordinary tungsten light bulbs. ### Claim 18 (depends on 1) The LED lamp of claim 1, wherein the lamp base is a standard lamp base for ordinary halogen light bulbs. ### Claim 19 (depends on 1) The LED lamp of claim 1, wherein the lamp base is one of the standard E12, E14, E17, E26, E27, MR16, and GU10 lamp bases.