Source: https://patents.google.com/patent/US9611984B2/en
Timestamp: 2018-05-27 16:01:33
Document Index: 39150872

Matched Legal Cases: ['art 302', 'art 302', 'art 302', 'art 302', 'art 302', 'art 302', 'art 302', 'art 302', 'art 302', 'art 302', 'art 302', 'art 302', 'art 302', 'art 302', 'art 302', 'art 302', 'art 302', 'art 302', 'art 302', 'art 302', 'art 302', 'art 302', 'art 302', 'art 302', 'art 302', 'art 302', 'art 302', 'art 302', 'art 302', 'art 302', 'art 302', 'art 302', 'art 302', 'art 302', 'art 302', 'art 302', 'art 302', 'art 302', 'art.\n10', 'art.\n12']

US9611984B2 - LED tube lamp - Google Patents
US9611984B2
US9611984B2 US14818224 US201514818224A US9611984B2 US 9611984 B2 US9611984 B2 US 9611984B2 US 14818224 US14818224 US 14818224 US 201514818224 A US201514818224 A US 201514818224A US 9611984 B2 US9611984 B2 US 9611984B2
US14818224
US20160290569A1 (en )
Ding-Kai Wang
An LED tube lamp having an end cap and a lamp tube is disclosed. The end cap includes an electrically insulating tubular part, sleeved with an end of the lamp tube, and a magnetic metal object disposed between an inner circumferential surface of the electrically insulating tubular part and the end of lamp tube. The electrically insulating tubular part having an inner circumferential surface with a plurality of protruding portions formed thereon and extending inwardly in a radial direction of the electrically insulating tubular part. Each of the protruding portions is disposed between an outer circumferential surface of the magnetic metal member and the inner circumferential surface of the electrically insulating tubular part, thereby forming a space therebetween, in which a hot melt adhesive is filled so that the end cap and the end of the lamp tube are adhesively bonded.
The present invention relates to illumination device, and more particularly to an LED tube lamp having an end cap and a lamp tube.
In the present embodiment, the outer diameter of the end caps 3 are the same as the outer diameter of the main region 102, and the tolerance for the outer diameter measurements thereof are preferred to be within +/−0.2 millimeter (mm), and should not exceed +/−1.0 millimeter (mm). The difference between an outer diameter of the rear end region 101 and the outer diameter of the main region 102 can be 1 mm to 10 mm for typical product applications. Meanwhile, for preferred embodiment, the difference between the outer diameter of the rear end region 101 and the outer diameter of the main region 102 can be 2 mm to 7 mm. The length of the transition region 103 along the axial direction of the lamp tube 1 is between 1 mm to 4 mm. Upon experimentation, it was found that when the length of the transition region 103 along the axial direction of the lamp tube 1 is either less than 1 mm or more than 4 mm, problems would arise due to insufficient strength or reduction in light illumination surface of the lamp tube. In alternative embodiment, the transition region 103 can be without curve or arc in shape. Upon adopting the T8 standard lamp format as an example, the outer diameter of the rear end region 101 is configured between 20.9 mm to 23 mm. Meanwhile, if the outer diameter of the rear end region 101 is less than 20.9 mm, the inner diameter of the rear end region 101 would be too small, thus rendering inability of the power supply to be fittingly inserted into the lamp tube 1. The outer diameter of the main region 102 is preferably configured to be between 25 mm to 28 mm.
Referring to FIG. 2, the LED light bar 2 of the embodiment of the present invention has a plurality of LED light sources 202 mounted thereon. The end cap 3 has a power supply 5 installed therein. The LED light sources 202 and the power supply 5 are electrically connected by the LED light bar 2. The power supply 5 may be in the form of a single individual unit (i.e., all of the power supply components are integrated into one module unit), and to be installed in one end cap 3. Alternatively, the power supply 5 may be divided into two separate units (i.e. all of the power supply components are divided into two parts) which are installed at the end caps 3, respectively. The number of units of the power supply 5 is corresponding to the number of the ends of the lamp tube 1 which had undergone glass tempering and strengthening process. In addition, the location of the power supply is also corresponding to the location of the lamp tube 1 which had undergone glass tempering. The power supply can be fabricated by encapsulation molding by using a high thermal conductivity silica gel (with thermal conductivity ≧0.7 w/m·k), or fabricated in the form of exposed power supply electronic components that are packaged by conventional heat shrink sleeved to be placed into the end cap 3. Referring to FIG. 2 and FIGS. 4-6, the power supply 5 includes a male plug 501 and a metal pin 502. The male plug 501 and the metal pin 502 are located at opposite ends of the power supply 5. The LED light bar 2 is configured with a female plug 201 at an end thereof. The end cap 3 is configured with a hollow conductive pin 301 used for coupling with an external power source. The male plugs 501 of the power supply 5 are fittingly engaged into the female plug 201 of the LED light bar 2, while the metal pins 502 of the power supply 5 are fittingly engaged into the hollow conductive pins 301 of the end cap 3. Upon inserting the metal pin 502 into the hollow conductive pin 301, a punching action is provided against the hollow conductive pin 31 using an external punching tool to create a slight amount of shape deformation of the hollow conductive pin 301, thereby securing and fixing the metal pin 502 of the power supply 5. Upon being energized or powered on, the electrical current passes through the hollow conductive pin 301, the metal pin 502, the male plug 501, and the female plug 201, to reach the LED light bar 2, and through the LED light bar 2 to reach the LED light sources 202. In other embodiments, the male plug 501 and the female plug 502 connection structure may not be employed, and conventional wire bonding techniques can be adopted for replacement.
During fabrication of the LED tube lamp, the rear end region 101 of the lamp tube 1 is inserted into one end of the end cap 3, the axial length of the portion of the rear end region 101 of the lamp tube 1 which had been inserted into the end cap 3 accounts for one-third (⅓) to two-thirds (⅔) of the total length of the thermal conductive ring 303 in an axial direction thereof. One benefit is that, the hollow conductive pins 301 and the thermal conductive ring 303 have sufficient creepage distance therebetween, and thus is not easy to form a short circuit leading to dangerous electric shock to individuals. On the other hand, due to the electrically insulating effect of the electrically insulating tubular part 302, thus the creepage distance between the hollow conductive pin 301 and the thermal conductive ring 303 is increased, and thus less people are likely to obtain electric shock caused by operating and testing under high voltage conditions. In this embodiment, the electrically insulating tube 302 in general state, is not a good conductor of electricity and/or is not used for conducting purposes, but not limited to the use made of plastics, ceramics and other materials. Furthermore, for the hot melt adhesive 6 disposed in the inner surface of the second tubular part 302 b, due to presence of the second tubular part 302 b interposed between the hot melt adhesive 6 and the thermal conductive ring 303, therefore the heat conducted from the thermal conductive ring 303 to the hot melt adhesive 6 may be reduced. Thus, referring to FIG. 5, in this another embodiment, the end of the second tubular part 302 b facing the lamp tube 1 (i.e., away from the first tubular part 302 a) is provided a plurality of notches 302 c, configured for increasing the contact area of the thermal conductive ring 303 and the hot melt adhesive 6, in order to be more conducive to provide rapid heat conduction from the thermal conductive ring 303 to the hot melt adhesive 6, so as to accelerate the curing of the hot melt adhesive 6. The notches 302 c are spatially arranged along a circumferential direction of the second tubular part 302 b. Meanwhile, when the user touches the thermal conductive ring 303, due to the insulation property of the hot melt adhesive 6 located between the thermal conductive ring 303 and the lamp tube 1, no electrical shock would likely be produced by touching damaged portion of the lamp tube 1.
The thermal conductive ring 303 can be made of various heat conducting materials, the thermal conductive ring 303 of the present embodiment is a metal sheet, such as aluminum alloy. The second tubular part 302 b is sleeved with the thermal conductive ring 303 being tubular or ring shaped. The electrically insulating tubular part 302 may be made of electrically insulating material, but would have low thermal conductivity so as to prevent the heat conduction to reach the power supply components located inside the end cap 3, which then negatively affect performance of the power supply components. In this embodiment, the electrically insulating tubular part 302 is a plastic tube. In other embodiments, the thermal conductive ring 303 may also be formed by a plurality of metal plates arranged along a plurality of second tubular part 302 b in either circumferentially-spaced or not circumferentially-spaced arrangement. In other embodiments, the end cap may take on or have other structures. Referring to FIGS. 8-9, the end cap 3 according to another embodiment includes a magnetic object being of a metal member 9 and an electrically insulating tubular part 302, but not a thermal conductive ring. The magnetic metal member 9 is fixedly arranged on the inner circumferential surface of the electrically insulating tubular part 302, and has overlapping portions with respect to the lamp tube 1 in the radial direction. The hot melt adhesive 6 is coated on the inner surface of the magnetic metal member 9 (the surface of the magnetic metal tube member 9 facing the lamp tube 1), and bonding with the outer peripheral surface of the lamp tube 1. In order to increase the adhesion area, and to improve the stability of the adhesion, the hot melt adhesive 6 can cover the entire inner surface of the magnetic metal member 9. When manufacturing the LED tube lamp of the another embodiment, the electrically insulating tubular part 302 is inserted in an induction coil 11, so that the induction coil 11 and the magnetic metal member 9 are disposed opposite (or adjacent) to one another along the radial extending direction of the electrically insulating tubular part 302. A method for bonding the end cap 3 and the lamp tube 1 with the magnetic metal member 9 according to a second embodiment includes the following steps. The induction coil 11 is energized. After the induction coil 11 is energized, the induction coil 11 forms an electromagnetic field, and the electromagnetic field upon contacting the magnetic metal member 9 then transform into an electrical current, so that the magnetic metal member 9 becomes heated. Then, the heat from the magnetic metal member 9 is transferred to the hot melt adhesive 6, thus curing the hot melt adhesive 6 so as to bond the end cap 3 with the lamp tube 1. The induction coil 11 and the electrically insulating tubular part 302 are coaxially aligned, so that the energy transfer is more uniform. In this embodiment, a deviation value between the axes of the induction coil 11 and the electrically insulating tubular part 302 is not more than 0.05 mm. When the bonding process is complete, the induction coil 11 is removed away from the lamp tube 1. The electrically insulating tubular part 302 is further divide into two portions, namely a first tubular part 302 d and a second tubular part 302 e. In order to provide better support of the magnetic metal member 9, an inner diameter of the first tubular part 302 d at the inner circumferential surface of the electrically insulating tubular part 302, for supporting the magnetic metal member 9, is larger than the inside diameter of the second tubular part 302 e, and a stepped structure is formed by the electrically insulating tubular part 302 and the second tubular part 302 e, where an end of the magnetic metal member 9 as viewed in an axial direction is abutted against the stepped structure. An inside diameter of the magnetic metal member 9 is larger than an outer diameter of the end (which is the rear end region 101) of the lamp tube 1. Upon installation of the magnetic metal member 9, the entire inner surface of the end cap 3 is maintained flush. Additionally, the magnetic metal member 9 may be of various shapes, e.g., a sheet-like or tubular-like structures being circumferentially arranged or the like, where the magnetic metal member 9 is coaxially arranged with the electrically insulating tubular part 302. In other embodiments, the manufacturing process for bonding the end cap 3 and the lamp tube 1 can be achieved without the magnetic metal member 9. The magnetic substance such as iron powder, nickel powder or iron-nickel powder (being made of iron, nickel, or iron-nickel alloy) is directly mixed in the hot melt adhesive 6. When manufacturing the LED tube lamp of the embodiment, the hot melt adhesive 6 is contained between the inner circumferential surface of the electrically insulating tubular part 302 of the end cap 3 and the end of the lamp tube 1. After the induction coil 11 is energized, the induction coil 11 forms an electromagnetic field, and the charged particles of the magnetic object become heated. Then, the heat generated from the charged particles of the magnetic object is transferred to the hot melt adhesive 6, thus curing the hot melt adhesive 6 so as to bond the end cap 3 with the lamp tube 1.
In other embodiments, the magnetic metal member 9 can have at least one opening 901 as shown in FIG. 19, in which the openings 901 can be circular, but not limited to being circular in shape, such as, for example, oval, square, star shaped, etc., as long as being possible to reduce the contact area between the magnetic metal member 9 and the inner peripheral surface of the electrically insulating tubular part 302, but while maintaining the function of melting and curing the hot melt adhesive 6. Preferably, the openings 901 occupy 10% to 50% of the area of the magnetic metal member 9. The opening 901 can be arranged circumferentially around the magnetic metal member 9 in an equidistantly spaced or not equally spaced manner. In other embodiments, the magnetic metal member 9 has an indentation/embossed structure 903 as shown in FIG. 20, in which the embossed structure 903 are formed to be protruding from the inner surface of the magnetic metal member 9 toward the outer surface of the magnetic metal member 9, or vice versa, so long as the contact area between the inner peripheral surface of the electrically insulating tubular part 302 and the outer surface of the magnetic metal member 9 is reduced, but can sustain the function of melting and curing the hot melt adhesive 6. In other embodiments, the magnetic metal member 9 is a non-circular ring, such as, but not limited to an oval ring as shown in FIG. 21. When the lamp tube 1 and the end cap 3 are both circular, the minor axis of the oval ring shape is slightly larger than the outer diameter of the end region of the lamp tube 1, so long as the contact area of the inner peripheral surface of the electrically insulating tubular part 302 and the outer surface of the magnetic metal member 9 is reduced, but can achieve or maintain the function of melting and curing the hot melt adhesive 6. When the lamp tube 1 and the end cap 3 is circular, non-circular rings can reduce the contact area between the magnetic metal member 9 and the inner peripheral surface of the electrically insulating tubular part, but still can maintain the function of melting and curing hot melt adhesive 6. In other words, the inner surface of the electrically insulating tubular part 302 includes a supporting portion 313, which supports the (non-circular shaped) magnetic metal member 9, so that the contact area between the magnetic metal member 9 and the inner surface of the electrically insulating tubular part 302 is reduced, but still achieve the melting and curing of the hot melt adhesive 6. In other embodiments, the inner circumferential surface of the electrically insulating tubular part 302 has a plurality of supporting portions 313 and a plurality of protruding portions 310, as shown in FIGS. 16-18, in which the thickness of the protruding portion 310 is smaller than the thickness of the supporting portion 313. A stepped structure is formed at an upper edge of the supporting portion 313, in which the magnetic metal member 9 is abutted against the upper edges of the supporting portions 313, so that the magnetic metal member 9 can be then securely or firmly mounted within the electrically insulating tubular part 302. At least a portion of the protruding portion 310 is positioned between the inner peripheral surface of the electrically insulating tubular part 302 and the magnetic metal member 9. The arrangement or configuration of the protruding portions 310 may be arranged in a ring configuration in the circumferential direction along the inner circumferential surface of the electrically insulating tubular part 302 at equidistantly spaced or non-equidistantly spaced distances, the contact area of the inner peripheral surface of the electrically insulating tubular part 302 and the outer surface of the magnetic metal member 9 is reduced, but can achieve or maintain the function of melting and curing the hot melt adhesive 6. The protruding thickness of the supporting portion 313 toward the interior of the electrically insulating tubular part 302 is between 1 mm to 2 mm. The thickness of the protruding portion 310 of the electrically insulating tubular part 302 that is disposed on the outer surface of the magnetic metal member 9 is less than the thickness of the supporting portion 313, and the thickness of the protruding portion 310 is between 0.2 mm to 1 mm.
Referring to illustrated embodiment of FIG. 11, the LED light bar 2 is a bendable circuit sheet which includes a wiring layer 2 a and a dielectric layer 2 b that are stackingly arranged. The LED light source 202 is disposed on a surface of the wiring layer 2 a away from the dielectric layer 2 b. In other words, the dielectric layer 2 b is disposed on the wiring layer 2 a away from the LED light sources 202. The wiring layer 2 a is electrically connected to the power supply 5. Meanwhile, the adhesive sheet 4 is disposed on a surface of the dielectric layer 2 b away from the wiring layer 2 a to bond and to fix the dielectric layer 2 b to the inner circumferential surface of the lamp tube 1. The wiring layer 2 a can be a metal layer serving as a power supply layer, or can be bonding wires such as copper wire. In alternative embodiment, the LED light bar 2 further includes a circuit protection layer (not shown). In another alternative embodiment, the dielectric layer can be omitted, in which the wiring layer is directly bonded to the inner circumferential surface of the lamp tube. The circuit protection layer can be an ink material, possessing functions as solder resist and optical reflectance. Whether the wiring layer 2 a is of one-layered, or two-layered structure, the circuit protective layer can be adopted. The circuit protection layer can be disposed on the side/surface of the LED light bar 2, such as the same surface of the wiring layer which has the LED light source 202 disposed thereon. It should be noted that, in the present embodiment, the bendable circuit sheet is a one-layered structure made of just one layer of the wiring layer 2 a, or a two-layered structure (made of one layer of the wiring layer 2 a and one layer of the dielectric layer 2 b), and thus would be more bendable or flexible to curl than the conventional three-layered flexible substrate. As a result, the bendable circuit sheet (the LED light bar 2) of the present embodiment can be installed in other lamp tube that is of a customized shape or non-linear shape, and the bendable circuit sheet can be mounted touching the sidewall of the lamp tube. The bendable circuit sheet mounted closely to the tube wall is one preferred configuration, and the fewer number of layers thereof, the better the heat dissipation effect, and the lower the material cost. Of course, the bendable circuit sheet is not limited to being one-layered or two-layered structure only, while in other embodiment, the bendable circuit sheet can include multiple layers of the wiring layers 2 a and multiple layers of the dielectric layers 2 b, in which the dielectric layers 2 b and the wiring layers 2 a are sequentially stacked in a staggered manner, respectively, to be disposed on the surface of the one wiring layer 2 a that is opposite from the surface of the one wiring layer 2 a which has the LED light source 202 disposed thereon. The LED light source 202 is disposed on the uppermost layer of the wiring layers 2 a, and is electrically connected to the power supply 5 through the (uppermost) wiring layer 2 a. Furthermore, the inner peripheral surface of the lamp tube 1 or the outer circumferential surface thereof is covered with an adhesive film (not shown), for the sake of isolating the inner content from outside content of the lamp tube 1 after the lamp tube 1 has been ruptured. The present embodiment has the adhesive film coated on the inner peripheral surface of the lamp tube 1.
Xylene is used as an auxiliary material. Upon solidifying or hardening of the coated adhesive film when coated on the inner surface of the lamp tube 1, the xylene will be volatilized and removed. The xylene is mainly used for the purpose of adjusting the degree of adhesion or adhesiveness, which can then adjust the thickness of the bonding adhesive. In the present embodiment, the thickness of the coated adhesive film can be between 10 to 800 micron meters (μm), and the preferred thickness of the coated adhesive film can be between 100 to 140 micron meters (μm). This is because the bonding adhesive thickness being less than 100 micron meters, does not have sufficient shatterproof capability for the glass tube, and thus the glass tube is prone to crack or shatter. At above 140 micron meters of bonding adhesive thickness would reduce the light transmittance rate, and also increase material cost. Vinyl silicone oil+hydrosilicone oil allowable ratio range is (19.8-20.2):(20.2-20.6), but if exceeding this allowable ratio range, would thereby negatively affect the adhesiveness or bonding strength. The allowable ratio range for the xylene and calcium carbonate is (2-6):(2-6), and if lesser than the lowest ratio, the light transmittance of the lamp tube will be increased, but grainy spots would be produced or resulted from illumination of the LED lamp tube, negatively affect illumination quality and effect.
Referring to FIG. 15, the LED light source 202 may be further modified to include a LED lead frame 202 b having a recess 202 a, and an LED chip 18 disposed in the recess 202 a. Specifically, the traditional dimension of the LED chip 18 is in square shape of the length side to the width side at a ratio about 1:1. In the present invention, the LED chip 18 can be in rectangular shape as a strip with the dimension of the length side to the width side at a ratio range from 2:1 to 10:1, preferably at a ratio range from 2.5:1 to 5:1, and further preferably at a ratio range from 3:1 to 4.5:1. As a result, the length direction of the LED chip 18 is arranged and extending along with the length direction of the lamp tube 1 to improve the average circuit density of the LED chip 18 and the overall illumination field shape of the lamp tube 1. The recess 202 a is filled with phosphor, the phosphor coating is covered on the LED chip 18 to convert to the desired color light. In one lamp tube 1, there are multiple number of LED light sources 202, which are arranged into one or more rows, each row of the LED light sources 202 is arranged along the axis direction or length direction (Y-direction) of the lamp tube 1. The recess 202 a belonging to each LED lead frame 202 b may be one or more. In the illustrated embodiment, each LED lead frame 202 b has one recess 202 a, and correspondingly, the LED lead frame 202 b includes two first sidewalls 15 arranged along a length direction (Y-direction) of the lamp tube 1, and two second sidewalls 16 arranged along a width direction (X-direction) of the lamp tube 1. In the present embodiment, the first sidewall 15 is extending along the width direction (X-direction) of the lamp tube 1, the second sidewall 16 is extending along the length direction (Y-direction) of the lamp tube 1. The first sidewall 15 is lower in height than the second sidewall 16. The recess 202 a is enclosed by the first sidewalls 15 and the second sidewalls 16. In other embodiments, in one row of the LED light sources, it is permissible to have one or more sidewalls of the LED lead frames of the LED light sources to adopt other configuration or manner of extension structures. When the user is viewing the along the X-direction toward the lamp tube, the second sidewall 16 can block the line of sight of the user to the LED light source 202, thus reducing unappealing grainy spots. The first sidewall 15 can be extended along the width direction of the lamp tube 1, but as long as being extended along substantially similar to the width direction to be considered sufficient enough, and without requiring to be exactly parallel to the width direction of the lamp tube 1, and may be in a different structure such as zigzag, curved, wavy, and the like. The second sidewall 16 can be extended along the length direction of the lamp tube 1 but as long as being extended along substantially similar to the length direction to be considered sufficient enough, and without requiring to be exactly parallel to the length direction of the lamp tube 1, and may be in a different structure such as zigzag, curved, wavy, and the like. Having the first sidewall 15 being of a lower height than the second sidewall 16 is beneficial for allowing light illumination to be easily dispersed beyond the LED lead frame 202 b, and no grainy effect is produced upon viewing in the Y-direction. The first sidewall 15 includes an inner surface 15 a. The inner surface 15 a of the first sidewall 15 is a sloped surface, which promotes better light guiding effect for illumination and facing toward outside of the recess. The inner surface 15 a can be a flat or curved surface. The slope of the inner surface 15 a is between about 30 degrees to 60 degrees. In other words, the included angle between the bottom surface of the recess 202 a and the inner surface 15 a is between 120 and 150 degrees. In other embodiments, the slope of the inner surface of the first sidewall can also be between about 15 degrees to 75 degrees, that is, the included angle between the bottom surface of the recess 202 a and the inner surface of the first sidewall is between 105 degrees to 165 degrees. Alternatively, the slope may be a combination of flat and curved surface. In other embodiments, if there are several rows of the LED light sources 202, arranged in a length direction (Y-direction) of the lamp tube 1, as long as the LED lead frames 202 b of the LED light sources 202 disposed in the outermost two rows (at closest to the lamp tube) along in the width direction of the lamp tube 1, are to have two first sidewalls 15 configured along the length direction (Y-direction) and two second sidewalls 16 configured in one straight line along the width direction (X-direction), so that the second sidewalls 16 are disposed on a same side of the same row are collinear to one another. However, the arrangement direction of the LED lead frames 202 b of the other LED light sources 202 that are located between the aforementioned LED light sources 202 disposed in the outermost two rows are not limited, for example, for the LED lead frames 202 b of the LED light sources 202 located in the middle row (third row), each LED lead frame 202 b can include two first sidewalls 15 arranged along in the length direction (Y-direction) of the lamp tube 1, and two second sidewalls 16 arranged along in the width direction (X-direction) of the lamp tube 1, or alternatively, each LED lead frame 202 b can include two first sidewalls 15 arranged along in the width direction (X-direction) of the lamp tube 1, and two second sidewalls 16 arranged along in the length direction (Y-direction) of the lamp tube 1, or arranged in a staggered manner. When the user is viewing from the side of the lamp tube along the X-direction, the outermost two rows of the LED lead frames 202 b of the LED light sources 202 can block the user's line of sight for directly seeing the LED light sources 202. As a result, the visual graininess unpleasing effect is reduced. Similar to the present embodiment, with regard to the two outermost rows of the LED light sources, one or more of the sidewalls of the LED lead frames of the LED light sources to adopt other configurational or distribution arrangement. When multiple number of the LED light sources 202 are distributed or arranged along the length direction of the lamp tube in one row, the LED lead frames 202 b of the multiple number of the LED light sources 202 have all of the second sidewalls 16 thereof disposed in one straight line along the width direction of the lamp tube, respectively, that is to say, being at the same side, the second sidewalls 16 form substantially a wall structure to block the user's line of sight from seeing directly at the LED light source 202. When the multiple number of the LED light sources 202 are distributed or arranged along the length direction of the lamp tube in multiple rows, the multiple number of the LED light sources 202 are distributed or arranged along the width direction, with regard to the two outermost rows of the LED light sources located along the width direction of the lamp tube, each row of the LED lead frames 202 b of the multiple number of the LED light sources 202, in which all of the second sidewalls 16 disposed at the same side are in one straight line along the width direction of the lamp tube, that is to say, being at the same side, as long as the second sidewalls 16 of the LED light sources 202 located at the outermost two rows can block the user's line of sight for directly seeing the LED light sources 202, the reduction of visual graininess unpleasing effect can thereby be achieved. Regarding the one or more middle row(s) of the LED light sources 202, the arrangement, configuration or distribution of the sidewalls are not specifically limited to any particular one, and can be same as or different from the arrangement and distribution of the two outermost rows of the LED light sources, without departing from the spirit and scope of present disclosure.
an end cap, configured to be attached with an end of the lamp tube, comprising:
an electrically insulating tubular part, sleeved with the end of the lamp tube, the electrically insulating tubular part having an inner circumferential surface with a plurality of protruding portions formed thereon and extending inwardly in a radial direction of the electrically insulating tubular part; and
a magnetic metal member, fixedly disposed between the protruding portions of the inner circumferential surface of the electrically insulating tubular part of the end cap and the end of the lamp tube, wherein each of the protruding portions is disposed between an outer circumferential surface of the magnetic metal member and the inner circumferential surface of the electrically insulating tubular part, thereby forming a space therebetween.
two end caps, each configured to be attached with an end of the lamp tube, and each comprising:
an electrically insulating tubular part, sleeved with the respective end of the lamp tube, the electrically insulating tubular part having an inner circumferential surface with a plurality of protruding portions formed thereon and extending inwardly in a radial direction of the electrically insulating tubular part; and
a magnetic metal member, fixedly disposed between the protruding portions of the inner circumferential surface of the electrically insulating tubular part of the end cap and an outer circumferential surface of the end of the lamp tube,
wherein the lamp tube includes a main region, a transition region and an end region, the transition region being arc-shaped at both ends, one end cap is sleeved with the end region of the lamp tube, and an outer diameter of the end region is less than an outer diameter of the main region.
3. The LED tube lamp of claim 2, wherein each of the protruding portions is disposed between an outer circumferential surface of the magnetic metal member and the inner circumferential surface of the electrically insulating tubular part, thereby forming a space therebetween.
4. The LED tube lamp of claim 3, wherein a hot melt adhesive is contained in the space.
5. The LED tube lamp of claim 2, wherein the one end cap and the respective end of the lamp tube are adhesively bonded.
6. The LED tube lamp of claim 5, wherein the one end cap and the end of the lamp tube are adhesively bonded together by a hot melt adhesive.
7. The LED tube lamp of claim 6, wherein the magnetic metal member is disposed inside the electrically insulating tubular part of the one end cap, and the hot melt adhesive is coated over an entire inner surface of the magnetic metal member.
8. The LED tube lamp of claim 2, wherein a thickness of each of the protruding portions of the electrically insulating tubular part is between 0.2 mm and 1 mm.
9. The LED tube lamp of claim 8, wherein each of the protruding portions is formed along the inner circumferential surface of the electrically insulating tubular part to be arranged in a ring configuration, and the number of the protruding portions are more than one, to be spatially arranged along the inner circumferential surface of the electrically insulating tubular part.
10. The LED tube lamp of claim 9, wherein the protruding portions are arranged in a circumferential direction at an equidistantly spaced distance along the inner circumferential surface of the electrically insulating tubular part, respectively.
11. The LED tube lamp of claim 9, wherein the protruding portions are arranged in a circumferential direction at a plurality of non-equidistantly spaced distances along the inner circumferential surface of the electrically insulating tubular part.
12. The LED tube lamp of claim 2, wherein an inside diameter of the magnetic metal member is larger than an outer diameter of the end of the lamp tube.
13. The LED tube lamp of claim 2, wherein the sizes of the two end caps are different.
14. The LED tube lamp of claim 13, wherein the size of one end cap is 30%-80% of the size of the other end cap.
an end cap, configured to be attached with the end of the lamp tube, comprising:
a magnetic object, disposed between the protruding portions of the inner circumferential surface of the electrically insulating tubular part of the end cap and an outer circumferential surface of the end of the lamp tube.
16. The LED tube lamp of claim 15, wherein each of the protruding portions is disposed between an outer circumferential surface of the magnetic object and the inner circumferential surface of the electrically insulating tubular part, thereby forming a space therebetween.
17. The LED tube lamp of claim 16, wherein a hot melt adhesive is contained in the space.
18. The LED tube lamp of claim 15, wherein the end cap and the end of the lamp tube are adhesively bonded.
19. The LED tube lamp of claim 18, wherein the end cap and the end of the lamp tube are adhesively bonded together by a hot melt adhesive.
20. The LED tube lamp of claim 15, wherein a thickness of each of the protruding portions of the electrically insulating tubular part is between 0.2 mm and 1 mm.
US14818224 2014-09-28 2015-08-04 LED tube lamp Active US9611984B2 (en)
US14677899 US9625129B2 (en) 2014-09-28 2015-04-02 LED tube light
US14724840 US9625137B2 (en) 2014-09-28 2015-05-29 LED tube light with bendable circuit board
US14818224 US9611984B2 (en) 2015-04-02 2015-08-04 LED tube lamp
US14859370 US9955587B2 (en) 2015-04-02 2015-09-21 LED tube lamp
US14677899 Continuation-In-Part US9625129B2 (en) 2014-09-28 2015-04-02 LED tube light
US14724840 Continuation-In-Part US9625137B2 (en) 2014-09-28 2015-05-29 LED tube light with bendable circuit board
US20160290569A1 true US20160290569A1 (en) 2016-10-06
US9611984B2 true US9611984B2 (en) 2017-04-04
ID=57015199
US14818224 Active US9611984B2 (en) 2014-09-28 2015-08-04 LED tube lamp
US (1) US9611984B2 (en)
US4156265A (en) * 1977-02-22 1979-05-22 Rose Manning I Safety sockets and loads
US20160290569A1 (en) 2016-10-06 application
JP2011134926A (en) 2011-07-07 Semiconductor light emitting device and method of manufacturing the same
CN204573639U (en) 2015-08-19 LED light source and LED fluorescent lamp
JP2007165843A (en) 2007-06-28 Light emitting module, its manufacturing method, and backlight unit using same
JP2007184237A (en) 2007-07-19 Light-emitting module, its manufacturing method, and backlight device using light-emitting module
JP2009054893A (en) 2009-03-12 Light emitting device
JP2012129542A (en) 2012-07-05 Light emitting module, light source device, liquid crystal display device, and manufacturing method of the light emitting module
US20160091156A1 (en) 2016-03-31 Led tube light with bendable circuit board
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:JIANG, TAO;JIANG, WEN-JANG;CHEN, SHAU-LIANG;AND OTHERS;SIGNING DATES FROM 20150526 TO 20150804;REEL/FRAME:036251/0984