LED lamp having lamp cover with inner reflecting surface and outer reflecting surface

• US 10,655,836 B2
• Filed: 07/03/2019
• Issued: 05/19/2020
• Est. Priority Date: 02/08/2018
• Status: Active Grant

• Current Assignee: Jiaxing Super Lighting Electric Appliance Co., Ltd.
• Original Assignee: Jiaxing Super Lighting Electric Appliance Co., Ltd.
• Inventors: Jiang, Tao, Wang, Mingbin, Xiong, Aiming, Zhou, Lin
• Primary Examiner(s): Alavi, Ali
• Application Number:
  US16/503,417
• Publication Number:
  US 20190346128A1
• Time in Patent Office: 321 Days
• Field of Search: 362294
• CPC Class Codes: F21K 9/233 specially adapted for generating a spot light distribution, e.g. for substitution of reflector lamps
• CPC Class Codes: F21K 9/235 Details of bases or caps, i.e. the parts that connect the light source to a fitting; Arrangement of components within bases or caps F21K9/238 takes precedence
• CPC Class Codes: F21K 9/237 Details of housings or cases, i.e. the parts between the light-generating element and the bases; Arrangement of components within housings or cases F21K9/238 takes precedence
• CPC Class Codes: F21K 9/238 Arrangement or mounting of circuit elements integrated in the light source
• CPC Class Codes: F21K 9/66 Details of globes or covers forming part of the light source
• CPC Class Codes: F21K 9/68 Details of reflectors forming part of the light source
• CPC Class Codes: F21V 23/009 the casing being inside the housing of the lighting device
• CPC Class Codes: F21V 29/503 of light sources cooling arrangements structurally associated with gas-discharge or vapour-discharge lamps H01J61/52; cooling arrangements structurally associated with electric incandescent lamps H01K1/58; cooling arrangements structurally associated with light-emitting diodes H01L33/64
• CPC Class Codes: F21V 29/508 of electrical circuits
• CPC Class Codes: F21V 29/773 the planes containing the fins or blades having the direction of the light emitting axis
• CPC Class Codes: F21V 29/83 the elements having apertures, ducts or channels, e.g. heat radiation holes
• CPC Class Codes: F21V 7/0025 Combination of two or more reflectors for a single light source array of reflectors for a cluster of light sources F21V7/0083
• CPC Class Codes: F21Y 2103/33 annular
• CPC Class Codes: F21Y 2105/18 annular; polygonal other than square or rectangular, e.g. for spotlights or for generating an axially symmetrical light beam
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H03H 11/04 Frequency selective two-port networks
• CPC Class Codes: H03H 7/0115 comprising only inductors and capacitors H03H7/075, H03H7/09, H03H7/12, H03H7/13 take precedence
• CPC Class Codes: H05B 45/00 Circuit arrangements for operating light-emitting diodes [LED]
• CPC Class Codes: H05B 45/37 Converter circuits
• CPC Class Codes: H05B 45/395 Linear regulators
• CPC Class Codes: H05B 45/56 : involving measures to prevent abnormal temperature of the LEDs
• CPC Class Codes: Y02B 20/00 : Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
• CPC Class Codes: Y02B 20/30 : Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Abstract

An LED lamp includes: a lamp shell; a passive heat dissipating element having a heat sink, wherein the heat sink comprises fins and a base; a power source; a light emitting surface connected to the heat sink of the passive heat dissipating element and comprising LED chips; a first heat dissipating channel formed in a first chamber of the lamp shell; a second heat dissipating channel formed in the heat sink and between the fins and the base of the heat sink; and a lamp cover connected with the heat sink and having a light output surface, an end surface, an inner reflecting surface disposed inside the light output surface of the lamp cover and an outer reflecting surface disposed in the outer circle of the array of the LED chips; wherein a relationship as follows is satisfied between the LED chips and the inner and outer reflecting surface: (A1/N1):(A2/N2)=0.4˜1; where A1 and A2 respectively represent area of the inner and outer reflecting surface; where N1 and N2 respectively represent number of the innermost and outermost of the array of LED chips of the light emitting surface.

Claims

1. An LED (light emitting diode) lamp comprising:

a lamp shell including a lamp head, a lamp neck and a sleeve, the lamp head connects to the lamp neck which connects to the sleeve;

a passive heat dissipating element having a heat sink connected to the lamp shell, wherein the heat sink comprises fins and a base, the sleeve of the lamp shell is located in the heat sink, the lamp neck projects from the heat sink, height of the lamp neck is at least 80% of height of the heat sink;

a power source having a first portion and a second portion, wherein the first portion of the power source is disposed in both the lamp neck and the lamp head of the lamp shell, and the second portion of the power source is disposed in the heat sink of the passive heat dissipating element;

a light emitting surface connected to the heat sink of the passive heat dissipating element and comprising LED chips electrically connected to the power source, wherein the light emitting surface and the heat sink are connected to form a heat transferring path from the LED chips to the passive heat dissipating element;

a first heat dissipating channel formed in a first chamber of the lamp shell for dissipating heat generated from the power source while the LED lamp is working, and the first chamber is located between bottom of the LED lamp and an upper portion of the lamp neck;

a second heat dissipating channel formed in the heat sink and between the fins and the base of the heat sink for dissipating the heat generated from the LED chips and transferred to the heat sink; and

a lamp cover connected with the heat sink and having a light output surface, an end surface, an inner reflecting surface disposed inside the light output surface of the lamp cover and an outer reflecting surface disposed in the outer circle of the array of the LED chips, wherein the end surface is formed with a vent to allow air flowing from outside of the LED lamp into both the first heat dissipating channel and the second heat dissipating channel through the vent, the inner reflecting surface is disposed in a position of an inner circle of the array of the LED chips, the outer reflecting surface is set to correspond to the LED chips on the light emitting surface;

wherein the first heat dissipating channel comprises a first end on the light emitting surface to allow air flowing from outside of the LED lamp into the first chamber, and a second end on the upper portion of the lamp neck of the lamp shell to allow air flowing from inside of the first chamber out to the LED lamp;

wherein the second heat dissipating channel comprises a third end on the light emitting surface to allow air flowing from outside of the LED lamp into the second heat dissipating channel, and flowing out from spaces between every adjacent two of the fins;

wherein a third aperture is located in a central region of the light emitting surface, and the third aperture forms an air intake of both the first heat dissipating channel and the second heat dissipating channel;

wherein the sleeve of the lamp shell is made of a material having lower thermal conductivity than that of material of the heat sink;

wherein the inner reflecting surface of the lamp cover is configured to reflect part of light emitted from the innermost of the array of LED chips, the outer reflecting surface of the lamp cover is configured to reflect part of light emitted from the outermost of the array of LED chips, and the outermost of the array of LED chips are greater than the innermost of array of LED chips in number, and the outer reflecting surface is greater than the inner reflecting surface in area;

wherein a relationship as follows is satisfied between the LED chips and the inner and outer reflecting surface;

(A1/N1);

(A2/N2)=0.4˜

1;

where A1 and A2 respectively represent area of the inner and outer reflecting surface;

where N1 and N2 respectively represent number of the innermost and outermost of the array of LED chips of the light emitting surface.

2. The LED lamp of claim 1, wherein the base of the heat sink has a projecting portion protrudes from the light emitting surface in an axial direction of the LED lamp, the projecting portion protrudes from the light emitting surface in the axial direction of the LED lamp, the projecting portion is configured to be annular and a concave structure is defined by both the projecting portion and the base for receiving and protecting both the light emitting surface and the light cover, the base has a first inner surface and the lamp cover has a peripheral wall, the first inner surface corresponds to the peripheral wall, a gap is kept between the first inner surface and the peripheral wall, the first inner surface is configured to be a slant and an angle is formed between the first inner surface and the light emitting surface, the angle is an obtuse angle.

3. The LED lamp of claim 2, wherein the base further includes a second inner surface, an end portion of the peripheral wall abuts against the second inner surface, an angle between the first inner surface and the light emitting surface is less than an angle between the second inner surface and the light emitting surface.

4. The LED lamp of claim 3, wherein the angle between the second inner surface and the light emitting surface is between 120 degrees and 150 degrees.

5. The LED lamp of claim 4, wherein the end portion of the peripheral wall is provided with protruding plates upward extending from the peripheral wall at regular intervals.

6. The LED lamp of claim 5, wherein the protruding plates are the parts that the end portion of the peripheral wall is in actual contact with the second inner surface.

7. The LED lamp of claim 6, wherein a gap is formed between the peripheral wall and the base and the base is formed with a hole, a side of the hole communicates with the gap and the other side corresponds to the fins.

8. The LED lamp of claim 7, wherein a chamber is formed between the light cover and the light emitting surface, and the light emitting surface and the LED chips are located in the chamber.

9. The LED lamp of claim 8, wherein the chamber has first apertures and second apertures, the first apertures are configured to communicate with the outside, and the second apertures are configured to communicate simultaneously with both the first heat dissipating channel and the second heat dissipating channel.

10. The LED lamp of claim 9, wherein the light output surface is provided with holes to form the first apertures, the inner reflecting surface is provided with notches to form the second apertures.

11. The LED lamp of claim 10, wherein the ratio of the number of the second apertures to that of the first apertures is 1:

1˜

2.

12. The LED lamp of claim 11, wherein the ratio of the number of the second apertures to that of the first apertures is 1:

1.5.

13. The LED lamp of claim 12, wherein the light emitting surface include at least two LED chip sets having the LED chips, an open region is formed between adjacent two LED chips of the same LED chip set, the open region between any two adjacent LED chips of one of the two adjacent chip sets on the light emitting surface interlaces to and communicates with the open region between any two adjacent LED chips of another one of the chip sets on the light emitting surface in a radial direction of the light emitting surface.

14. The LED lamp of claim 13, wherein three LED chip sets are annularly disposed along the radial direction of the light emitting surface in order, any open regions of the three LED chips are not in the same direction in the radial direction.