Flexible LED lamp filament and bulb

Abstract

The utility model discloses a flexible LED lamp filament and a bulb. The flexible LED lamp filament comprises a light-emitting part and a steering mechanism. The light-emitting part comprises a substrate and a normally-installed LED chip. The steering mechanism comprises a first end and a second end; when the light-emitting parts are connected, a steering mechanism is arranged between every two adjacent light-emitting parts, and the first end of the steering mechanism between every two adjacent light-emitting parts is connected with the base plate of one of the two adjacent light-emitting parts. The second end of the steering mechanism between the two adjacent light-emitting parts is connected with the substrate of the other light-emitting part in the two adjacent light-emitting parts; and in two adjacent light emitting parts, the negative electrode end of the positive LED chip at the tail end position in the plurality of positive LED chips in the light emitting part at the previous position is connected with the positive electrode end of the positive LED chip at the initial position in the plurality of positive LED chips in the light emitting part at the next position. The production cost is reduced by the normal LED chip, and the normal LED chip is not subjected to stress generated by bending, so that the probability of lamp damage is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of LED filaments, in particular to a flexible LED filament and a light bulb. Background Art

[0002] In some light bulbs, the LED (Light Emitting Diode) filament installed therein needs to be bent so that it can form a light-emitting filament of a certain shape as needed. Flexible LED filaments are widely used in such light bulbs because of their bendability.

[0003] Currently, commonly used flexible LED filaments are made using a flexible printed circuit (FPC) and a flip-chip LED chip package. Because flip-chip LED chips do not require wire bonding, flexible LED filaments made with FPC and flip-chip LED chips can bend with the circuit board, allowing them to be formed into desired shapes. While flexible LED filaments made with flip-chip LED chips can bend, the complex manufacturing process of flip-chip LED chips leads to high costs, further increasing the cost of these flexible LED filaments. Furthermore, bending stress is generated on the flip-chip LED chip during bending, which can easily cause the flip-chip LED chip to separate from the solder pads, leading to lamp failure.

[0004] Therefore, the existing technology still needs to be improved and developed. Utility Model Content

[0005] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a flexible LED filament and bulb to solve the problem in the prior art that the process of flip-chip LED chips is complicated, resulting in high costs, and the flexible LED filament is expensive. In addition, bending stress is generated on the flip-chip LED chip during the bending process, which easily causes the flip-chip LED chip to separate from the solder pad, resulting in lamp failure.

[0006] The utility model provides a flexible LED filament, comprising: a plurality of light-emitting parts connected in series and a steering mechanism for connecting the plurality of light-emitting parts;

[0007] The light emitting portion includes a substrate and a plurality of upright LED chips disposed on the substrate, wherein the plurality of upright LED chips are connected in series;

[0008] The steering mechanism includes a first end and a second end steerable relative to the first end;

[0009] Among them, when several of the light-emitting parts are connected, the steering mechanism is arranged between every two adjacent light-emitting parts, the first end of the steering mechanism between the two adjacent light-emitting parts is connected to the substrate of one of the two adjacent light-emitting parts, the second end of the steering mechanism between the two adjacent light-emitting parts is connected to the substrate of the other light-emitting part of the two adjacent light-emitting parts, and the negative end of the upright LED chip at the end position of several of the upright LED chips in the light-emitting part at the previous position of the two adjacent light-emitting parts is connected to the positive end of the upright LED chip at the starting position of several of the upright LED chips in the light-emitting part at the next position.

[0010] According to a further configuration of the present invention, the substrate is a transparent substrate.

[0011] According to a further configuration of the present invention, the transparent substrate is a cylindrical transparent substrate.

[0012] According to a further configuration of the present invention, a mounting groove is provided on the circumferential surface of the cylindrical transparent substrate, and a plurality of the upright LED chips are sequentially connected in series in the mounting groove.

[0013] A further configuration of the present invention is that the material of the steering mechanism is a conductive material, the first end of the steering mechanism is also connected to the negative end of the upright LED chip at the end position of several upright LED chips in the light-emitting portion at the previous position of two adjacent light-emitting portions, and the second end of the steering mechanism is also connected to the positive end of the upright LED chip at the starting position of several upright LED chips in the light-emitting position at the latter position of two adjacent light-emitting portions.

[0014] According to a further configuration of the present invention, the steering mechanism is a spherical universal joint.

[0015] According to a further configuration of the present invention, the spherical universal joint comprises a first connecting shaft, a first concave plate, a ball sleeve, a second connecting shaft, a second concave plate, and a ball head rotatably embedded in the ball sleeve;

[0016] One end of the first connecting shaft is connected to the ball sleeve, and the other end of the first connecting shaft is connected to the first concave plate. The first concave plate is connected to the cathode terminals of the end-positioned LED chips of the plurality of the front-mounted LED chips in the light-emitting portion of the preceding position of two adjacent light-emitting portions, and the substrate.

[0017] One end of the second connecting shaft is connected to the ball head, the other end of the second connecting shaft is connected to the second concave plate, and the second concave plate is connected to the positive end and substrate of the upright LED chips at the end position of several upright LED chips in the light-emitting part at the rear position of two adjacent light-emitting parts.

[0018] According to a further configuration of the present invention, at least the positive terminal or the negative terminal of the upright LED chip is led out through a wire.

[0019] A further configuration of the present invention further includes: a positive terminal and a negative terminal;

[0020] The positive electrode terminal is connected to the positive ends of the front-mounted LED chips at the starting position in the light-emitting parts of the light-emitting parts connected in series;

[0021] The negative electrode terminal is connected to the negative ends of the upright LED chips at the end positions of the plurality of upright LED chips at the end positions of the light emitting parts that are sequentially connected in series.

[0022] The present invention also provides a light bulb using the flexible LED filament described above, the light bulb comprising: an insulating glass lampshade, a stem arranged in the insulating glass lampshade, and two guide wires, the flexible LED filament being connected to the two guide wires respectively.

[0023] Beneficial effects

[0024] In the technical solution of the present invention, a steering mechanism is provided between every two adjacent light-emitting portions, so that the two adjacent light-emitting portions can be steered. Therefore, the flexible LED filament can be bent when in use. Since the flexible LED filament adopts a normal-mounted LED chip, the production cost is reduced. Moreover, since the flexible LED filament is bent by the steering mechanism, the normal-mounted LED chip will not be subjected to the stress caused by bending, thereby reducing the probability of lamp failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary personnel in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0026] Figure 1 This is a structural diagram of the flexible LED filament in the utility model.

[0027] Figure 2 It is a structural diagram of a substrate in one embodiment of the present utility model.

[0028] Figure 3 This is a diagram of the connection structure of the second connecting shaft, the second concave plate and the ball head in one embodiment of the utility model.

[0029] Figure 4 This is a diagram of the connection structure of the first connecting shaft, the first concave plate and the ball sleeve in one embodiment of the utility model.

[0030] Figure 5 In one embodiment of the present invention, the positive terminal and the negative terminal of the LED chip are led out by wires.

[0031] Figure 6 In one embodiment of the present invention, the negative terminal of the LED chip is led out by a wire.

[0032] Figure 7 This is a structural diagram of a flip-chip LED chip used in the prior art.

[0033] Figure 8 This is a schematic diagram of a flat substrate coated with fluorescent glue in the prior art.

[0034] The marks in the accompanying drawings are: 11, flip-chip LED chip; 12, FPC; 13, conductive terminal; 14, solder paste; 15, circuit copper foil; 16, FPC fixing buckle; 17, soldering pad; 20, light-emitting part; 201, substrate; 2011, mounting groove; 202, upright LED chip; 2021, wire; 21, steering mechanism; 211, second concave plate; 212, second connecting axis; 213, ball head; 214, ball sleeve; 215, first connecting axis; 216, first concave plate; 301, flat substrate; 302, fluorescent adhesive layer. DETAILED DESCRIPTION

[0035] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific embodiments of the present invention are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the directions or positional relationships indicated by "front", "back", "up", "down", "left", "right", "longitudinal", "horizontal", "vertical", "horizontal", "top", "bottom", "inside", "outside", "head", "tail", etc. are based on the directions or positional relationships shown in the accompanying drawings and are constructed and operated in specific directions. They are only for the convenience of describing the present technical solution and do not indicate that the devices or components referred to must have specific directions. Therefore, they should not be understood as limiting the present invention.

[0036] In some light bulbs, the LED (Light Emitting Diode) filament installed therein needs to be bent so that it can form a light-emitting filament of a certain shape as needed. Flexible LED filaments are widely used in such light bulbs because of their bendability.

[0037] like Figure 7As shown, a flexible LED filament is packaged using a flip-chip LED chip 11. In the flexible LED filament, a plurality of flip-chip LED chips 11 connected in series are provided. The plurality of flip-chip LED chips 11 are provided on an FPC 12. A circuit copper foil 15 is provided on the surface of the FPC 12. The solder pads 17 of the flip-chip LED chips 11 mounted on the FPC 12 are connected to the circuit copper foil 15 and further fixed by solder paste 14. A conductive terminal 13 is provided at each end of the FPC 12. The flip-chip LED chip 11 at one end of the plurality of flip-chip LED chips 11 is connected to the conductive terminal 13 at one end thereof, and the flip-chip LED chip 11 at the other end of the plurality of flip-chip LED chips 11 is connected to the other conductive terminal 13 at another end thereof. The conductive terminals 13 are fixed to the two ends of the FPC 12 by FPC fixing buckles 16. When the flexible LED filament is used, the two conductive terminals 13 are respectively connected to the corresponding conductors in the bulb, and the filament can be lit after power is connected.

[0038] It should be noted that the two conductive terminals 13 are respectively connected to the corresponding wires in the bulb, which means that the conductive terminal 13 used for connecting the positive pole is connected to the wire connected to the positive pole in the bulb, and the conductive terminal 13 used for connecting the negative pole is connected to the wire connected to the negative pole in the bulb.

[0039] Although the flexible LED filament made of the flip-chip LED chip 11 and the FPC 12 can be flexibly bent along with the circuit board so that it can be formed into a light-emitting filament of a certain shape as needed, the manufacturing process of the flip-chip LED chip 11 is complicated and the cost is high, which makes the cost of the flexible LED filament made of the flip-chip LED chip 11 high. In addition, bending stress will be generated on the flip-chip LED chip 11 during the bending process, which may easily cause the flip-chip LED chip 11 to detach from the solder pad 17, resulting in a broken lamp.

[0040] Based on the above problems, the present invention provides a flexible LED filament. Figure 1 As shown, the flexible LED filament may include a plurality of light-emitting portions 20 connected in series and a steering mechanism 21 for connecting the plurality of light-emitting portions 20 .

[0041] Among them, when several light-emitting parts 20 are connected, a steering mechanism 21 is provided between every two adjacent light-emitting parts 20, and the first end of the steering mechanism 21 between the two adjacent light-emitting parts 20 is connected to the substrate 201 of one light-emitting part 20 among the two adjacent light-emitting parts 20, and the second end of the steering mechanism 21 between the two adjacent light-emitting parts 20 is connected to the substrate 201 of the other light-emitting part 20 among the two adjacent light-emitting parts 20, and the negative end of the upright LED chip 202 at the end position of several upright LED chips 202 in the light-emitting part 20 at the previous position of the two adjacent light-emitting parts 20 is connected to the positive end of the upright LED chip 202 at the starting position of several upright LED chips 202 in the light-emitting part 20 at the next position.

[0042] Specifically, when several upright LED chips 202 in a light-emitting section 20 are connected, the positive terminal of one upright LED chip 202 among two adjacently connected upright LED chips 202 is connected to the negative terminal of the other upright LED chip 202. In this way, among the several upright LED chips 202 connected in series in a light-emitting section 20, the positive terminal of the upright LED chip 202 at the starting position and the negative terminal of the upright LED chip 202 at the end position form a path, that is, after the positive terminal of the upright LED chip 202 at the starting position is connected to the current, the negative terminal of the upright LED chip 202 at the end position will have current flowing out.

[0043] When several light-emitting parts 20 are connected, after the two adjacent light-emitting parts 20 are connected by the steering mechanism 21, the negative end of the upright LED chip 202 at the end position of several upright LED chips 202 in the light-emitting part 20 at the previous position of the two adjacent connected light-emitting parts 20 is also connected to the positive end of the upright LED chip 202 at the starting position of several upright LED chips 202 in the light-emitting part 20 at the latter position, so that when the flexible LED filament is used, several upright LED chips 202 in the light-emitting parts 20 connected in series in sequence form a path, that is, after the positive end of the upright LED chip 202 at the starting position in the light-emitting part 20 at the starting position is connected to the current, the negative electrode chip of the upright LED chip 202 at the end position in the light-emitting part 20 at the end position will have current flowing out.

[0044] It should be noted that the light-emitting section 20 at the front position of two adjacent light-emitting sections 20 refers to the light-emitting section 20 where the front-mounted LED chip 202 is connected to the current first among the two adjacent light-emitting sections 20. The light-emitting section 20 at the back position of two adjacent light-emitting sections 20 refers to the light-emitting section 20 where the front-mounted LED chip 202 is connected to the current last among the two adjacent light-emitting sections 20.

[0045] The upright LED chip 202 at the starting position refers to the position of the upright LED chip 202 that is first connected to the current among several upright LED chips 202 connected in series in a light-emitting section 20, and the upright LED chip 202 at the end position refers to the position of the upright LED chip 202 that is last to be connected to the current among several upright LED chips 202 connected in series in a light-emitting section 20.

[0046] The light emitting portion 20 at the starting position refers to the position of the light emitting portion 20 that is first connected to the current among the plurality of light emitting portions 20 , and the light emitting portion 20 at the end position refers to the position of the light emitting portion 20 that is last to output the current.

[0047] When the flexible LED filament is in use, since the negative end of the upright LED chip 202 at the end position of the several upright LED chips 202 in the light-emitting section 20 at the previous position of two adjacent connected light-emitting sections 20 is connected to the positive end of the upright LED chip 202 at the starting position of the several upright LED chips 202 in the light-emitting section 20 at the latter position, the flexible LED filament can be lit by connecting the upright LED chip 202 at the starting position of the several upright LED chips 202 in the light-emitting section 20 at the starting position of the several light-emitting sections 20 to the positive power supply end and connecting the upright LED chip 202 at the end position of the several upright LED chips 202 in the light-emitting section 20 at the end position of the several light-emitting sections 20 to the negative power supply end.

[0048] In this embodiment, a steering mechanism 21 is provided between every two adjacent light-emitting portions 20, so that the two adjacent light-emitting portions 20 can be steered. Therefore, the flexible LED filament can be bent when in use. Since the flexible LED filament adopts a straight-mounted LED chip 202, the production cost is reduced. Moreover, since the flexible LED filament is bent by the steering mechanism 21, the straight-mounted LED chip 202 will not be subjected to the stress caused by bending, thereby reducing the probability of lamp failure.

[0049] In some embodiments, the substrate 201 can be a transparent substrate. Specifically, when connecting multiple series-connected upright LED chips 202 within a light-emitting section 20, the multiple series-connected upright LED chips 202 are disposed on a transparent substrate. When connecting two adjacent light-emitting sections 20, the first end of the steering mechanism 21 is connected to the transparent substrate in one of the two adjacent light-emitting sections 20, and the second end of the steering mechanism 21 is connected to the transparent substrate in the other of the two adjacent light-emitting sections 20, thereby achieving the connection between the two adjacent light-emitting sections 20.

[0050] In this embodiment, since the substrate 201 is a transparent substrate, when the upright LED chip 202 on the transparent substrate is lit, the emitted light can also pass through the transparent substrate, so that the flexible LED filament can emit light in 360 degrees.

[0051] In this embodiment, the substrate may be made of, but not limited to, a transparent material, sapphire or glass.

[0052] Furthermore, the transparent substrate may be a cylindrical transparent substrate. In the prior art, the structure of the substrate 201 commonly used in flexible LED filaments is a flat substrate 301 (such as Figure 8 As shown in the figure, in order to make the flexible LED filament into a cylindrical structure, a large amount of fluorescent glue is coated on the front and back of the flat substrate 301 to form a fluorescent glue layer 302, so that the formed flexible LED filament has a cylindrical structure. Therefore, in this embodiment, the transparent substrate is set to a cylindrical structure, and the amount of fluorescent glue applied can be reduced when applying the fluorescent glue.

[0053] Further, if Figure 2 As shown, a mounting groove 2011 is opened on the circumferential surface of the cylindrical transparent substrate, and a plurality of upright LED chips 202 are sequentially arranged in series in the mounting groove 2011 .

[0054] Specifically, when the mounting groove 2011 is opened, a square groove may be opened approximately in the middle of the cylindrical transparent substrate, but is not limited to being opened. When several upright LED chips 202 are set, they are sequentially arranged in series in the square groove. After several upright LED chips 202 are set in the square groove, fluorescent glue is filled in the square groove.

[0055] Among them, when opening the installation groove 2011, it is necessary to consider the structural dimensions of the upright LED chip 202 set on the cylindrical transparent substrate, that is, to ensure that several upright LED chips 202 set on the cylindrical transparent substrate can be set in the installation groove 2011.

[0056] In this embodiment, since the upright LED chip 202 is arranged in the installation groove 2011, when the fluorescent glue is squeezed after filling it, the walls on both sides of the installation groove 2011 will form a support to avoid damaging the wire 2021 in the installation groove 2011 due to squeezing the fluorescent glue.

[0057] In some embodiments, the steering mechanism 21 is made of a conductive material, and the first end of the steering mechanism 21 is also connected to the negative end of the upright LED chip 202 at the end position of several upright LED chips 202 in the light-emitting portion 20 at the previous position of two adjacent light-emitting portions 20, and the second end of the steering mechanism 21 is also connected to the positive end of the upright LED chip 202 at the starting position of several upright LED chips 202 in the light-emitting position at the latter position of two adjacent light-emitting portions 20.

[0058] Specifically, the material of the steering mechanism 21 can be but is not limited to metal materials such as stainless steel, copper, and aluminum. When the upright LED chip 202 is connected to the steering mechanism 21, it is necessary to distinguish the specific position of the upright LED chip 202, that is, when the upright LED chip 202 in the light-emitting part 20 at the previous position is connected to the steering mechanism 21, the negative end of the upright LED chip 202 at the end position in the light-emitting part 20 at the previous position can be led out through the wire 2021 and connected to the first end of the steering mechanism 21; when the upright LED chip 202 in the light-emitting part 20 at the latter position is connected to the steering mechanism 21, the positive end of the upright LED chip 202 at the starting position in the light-emitting part 20 at the latter position can be led out through the wire 2021 and connected to the second end of the steering mechanism 21.

[0059] In this embodiment, since the material of the steering mechanism 21 is a conductive material, the steering mechanism 21 not only plays a steering role but also plays a role of conducting current. That is, the upright LED chip 202 at the front position and the LED chip at the rear position in two adjacent connected light-emitting parts 20 are connected through the steering mechanism 21, and there is no need to use a separate wiring to connect the negative end of the upright LED chip 202 at the end position in the light-emitting part 20 at the front position of the two adjacent light-emitting parts 20 with the positive end of the upright LED chip 202 at the starting position in the light-emitting part 20 at the rear position, which further reduces the cost.

[0060] In some embodiments, as Figure 1 As shown, the steering mechanism 21 may be a ball and socket joint.

[0061] In this embodiment, the spherical universal joint can rotate within a wide angle range when rotating, thereby improving the practicality of the flexible LED filament.

[0062] In some embodiments, as Figure 1 、 Figure 3 and Figure 4 As shown, the spherical universal joint includes a first concave plate 216 and a second concave plate 211; the first concave plate 216 is connected to the substrate 201 in the light-emitting portion 20 at the front position of two adjacent light-emitting portions 20; the second concave plate 211 is connected to the substrate 201 in the light-emitting portion 20 at the rear position of two adjacent light-emitting portions 20.

[0063] Specifically, the ball universal joint may include a first connecting shaft 215 , a first concave plate 216 , a ball sleeve 214 , a second connecting shaft 212 , a second concave plate 211 , and a ball head 213 .

[0064] Among them, one end of the first connecting shaft 215 is connected to the ball sleeve 214, the other end of the first connecting shaft 215 is connected to the first concave plate 216, the ball head 213 is rotatably embedded in the ball sleeve 214, one end of the second connecting shaft 212 is connected to the ball head 213, and the other end of the second connecting shaft 212 is connected to the second concave plate 211.

[0065] In this embodiment, when the first concave plate 216 (first end) is connected to the substrate 201, one end of the bottom of the substrate 201 with the mounting groove 2011 in the light-emitting portion 20 at the previous position of the two light-emitting portions 20 can be inserted into the first concave plate 216, and then the first concave plate 216 and the substrate 201 are fixedly connected by gluing; similarly, one end of the bottom of the substrate 201 with the mounting groove 2011 in the light-emitting portion 20 at the subsequent position of the two adjacent light-emitting portions 20 can be inserted into the second concave plate 211 (second end), and then the second concave plate 211 and the substrate 201 are fixedly connected by gluing.

[0066] Furthermore, after the first concave plate 216 and the second concave plate 211 are connected to the corresponding substrate 201, the negative end of the upright LED chip 202 at the end position of several upright LED chips 202 in the light-emitting section 20 at the previous position of two adjacent light-emitting sections 20, which are connected in series in sequence, is connected to the first concave plate 216 by welding; similarly, the positive end of the LED chip at the starting position of several upright LED chips 202 in the light-emitting section 20 at the latter position of two adjacent light-emitting sections 20, which are connected in series in sequence, is connected to the second concave plate 211 by welding.

[0067] In this embodiment, the arrangement of the first concave plate 216 and the second concave plate 211 makes it simple and convenient to connect the ball joint to the base plate 201 .

[0068] In some embodiments, at least the positive terminal or the negative terminal of the upright LED chip 202 is led out through a wire 2021 .

[0069] In a specific embodiment, if Figure 5 As shown, the positive terminal and the negative terminal of the front-mounted LED chip 202 are respectively led out through wires 2021.

[0070] When connecting two upright LED chips in a light-emitting section 20, the wire 2021 extending from the cathode terminal of the preceding upright LED chip 202 is connected to the wire 2021 extending from the anode terminal of the succeeding upright LED chip 202. When connecting the upright LED chip 202 at the end of a plurality of sequentially connected upright LED chips 202 in the preceding light-emitting section 20 of two adjacent light-emitting sections 20 to the ball joint, the wire 2021 extending from the cathode terminal of the preceding upright LED chip 202 in the preceding light-emitting section 20 is soldered to the first concave plate 216. When the upright LED chip 202 at the starting position among several upright LED chips 202 in the light-emitting section 20 at the rear position of two adjacent light-emitting sections 20 is connected to the spherical universal joint, the wire 2021 leading out from the positive end of the upright LED chip 202 at the starting position among several upright LED chips 202 in the light-emitting section 20 at the rear position is welded to the second concave plate 211.

[0071] In another specific embodiment, Figure 6 As shown, the cathode terminal of the front-mounted LED chip 202 is led out through a wire 2021 .

[0072] When connecting two upright LED chips in a light-emitting section 20, the wire 2021 extending from the cathode terminal of the preceding upright LED chip 202 is connected to the anode terminal of the succeeding upright LED chip 202. When connecting the upright LED chip 202 at the end of a plurality of sequentially connected upright LED chips 202 in the preceding light-emitting section 20 of two adjacent light-emitting sections 20 to the ball joint, the wire 2021 extending from the cathode terminal of the preceding upright LED chip 202 in the preceding light-emitting section 20 is soldered to the first concave plate 216. When the upright LED chip 202 at the starting position among several upright LED chips 202 in the light-emitting section 20 at the rear position of two adjacent light-emitting sections 20 is connected to the spherical universal joint, the positive end of the upright LED chip 202 at the starting position among several upright LED chips 202 in the light-emitting section 20 at the rear position is led out through the wire 2021 and soldered to the second concave plate 211 (there is no need to lead out the positive end of each upright LED chip 202 through the wire 2021).

[0073] In some embodiments, the flexible LED filament further includes a positive terminal and a negative terminal.

[0074] Specifically, the positive terminal is provided in a light-emitting section 20 at a starting position among the plurality of light-emitting sections 20 connected in series, and is connected to the positive terminal of the front-mounted LED chip 202 at the starting position among the plurality of front-mounted LED chips 202 connected in series in the light-emitting section 20. The negative terminal is provided in a light-emitting section 20 at a final position among the plurality of light-emitting sections 20 connected in series, and is connected to the negative terminal of the front-mounted LED chip 202 at the final position among the plurality of front-mounted LED chips 202 connected in series in the light-emitting section 20.

[0075] It should be noted that the light-emitting portion 20 at the starting position refers to the light-emitting portion 20 that is first connected to the current among several light-emitting portions 20 connected in series, and the light-emitting portion 20 at the end position refers to the light-emitting portion 20 that is last connected to the current among several light-emitting portions 20 connected in series.

[0076] In this embodiment, when the flexible LED filament is used, it is only necessary to connect the positive terminal to the positive pole of the power supply and the negative terminal to the negative pole of the power supply, which is simple and convenient to use.

[0077] In some embodiments, the present invention further provides a light bulb using the flexible LED filament described above. The light bulb may include an insulating glass lampshade, a core column arranged in the insulating glass lampshade, and two guide wires. The flexible LED filament is connected to the two guide wires respectively.

[0078] Specifically, there are two conductor wires in the insulating glass lampshade, one of which is connected to the positive pole and the other to the negative pole. When the flexible LED filament is connected to the two conductor wires, the positive ends of the upright LED chips 202 at the starting position of several light-emitting parts 20 connected in series in the flexible LED filament are connected to the conductor wire connected to the positive pole; the negative ends of the upright LED chips 202 at the end position of several light-emitting parts 20 connected in series in the flexible LED filament are connected to the conductor wire connected to the negative pole.

[0079] Among them, when the flexible LED filament is set, since a turning mechanism 21 is set between every two adjacent light-emitting parts 20 in the flexible LED filament, the two adjacent light-emitting parts 20 can be turned, so the flexible LED filament can be wound on the core column in the insulating glass lampshade.

[0080] It can be seen that the flexible LED filament can be bent when in use. Since the flexible LED filament adopts the upright LED chip 202, the production cost is reduced. Moreover, since the flexible LED filament is bent by the steering mechanism 21, the upright LED chip 202 will not be subjected to the stress caused by bending, thereby reducing the probability of lamp failure.

[0081] In summary, the present invention provides a flexible LED filament and bulb, which have the following beneficial effects:

[0082] A steering mechanism 21 is provided between every two adjacent light-emitting portions 20, so that the two adjacent light-emitting portions 20 can be steered. Therefore, the flexible LED filament can be bent when in use. Since the flexible LED filament adopts a straight-mounted LED chip 202, the production cost is reduced. Moreover, since the flexible LED filament is bent by the steering mechanism 21, the straight-mounted LED chip 202 will not be subjected to the stress caused by bending, thereby reducing the probability of lamp failure.

[0083] It can be understood that the above embodiments only express the preferred implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the patent scope of the present invention. It should be pointed out that for ordinary technicians in this field, without departing from the concept of the present invention, the above technical features can be freely combined, and several deformations and improvements can be made, all of which fall within the scope of protection of the present invention. Therefore, all equivalent changes and modifications made to the scope of the claims of the present invention should fall within the scope of coverage of the claims of the present invention.

Claims

1. A flexible LED filament, characterized in that: include: A plurality of light-emitting units connected in series and a steering mechanism for connecting the plurality of light-emitting units; The light emitting portion includes a substrate and a plurality of upright LED chips disposed on the substrate, wherein the plurality of upright LED chips are connected in series; The steering mechanism includes a first end and a second end steerable relative to the first end; Among them, when several of the light-emitting parts are connected, the steering mechanism is arranged between every two adjacent light-emitting parts, the first end of the steering mechanism between the two adjacent light-emitting parts is connected to the substrate of one of the two adjacent light-emitting parts, the second end of the steering mechanism between the two adjacent light-emitting parts is connected to the substrate of the other light-emitting part of the two adjacent light-emitting parts, and the negative end of the upright LED chip at the end position of several of the upright LED chips in the light-emitting part at the previous position of the two adjacent light-emitting parts is connected to the positive end of the upright LED chip at the starting position of several of the upright LED chips in the light-emitting part at the next position.

2. The flexible LED filament according to claim 1, characterized in that: The substrate is a transparent substrate.

3. The flexible LED filament according to claim 2, characterized in that: The transparent substrate is a cylindrical transparent substrate.

4. The flexible LED filament according to claim 3, characterized in that: A mounting groove is provided on the circumferential surface of the cylindrical transparent substrate, and a plurality of the upright LED chips are sequentially arranged in series in the mounting groove.

5. The flexible LED filament according to any one of claims 1 to 4, characterized in that: The material of the steering mechanism is a conductive material, and the first end of the steering mechanism is also connected to the negative end of the upright LED chip at the end position of several upright LED chips in the light-emitting part of the previous position between two adjacent light-emitting parts, and the second end of the steering mechanism is also connected to the positive end of the upright LED chip at the starting position of several upright LED chips in the light-emitting position of the next position between two adjacent light-emitting parts.

6. The flexible LED filament according to claim 5, characterized in that: The steering mechanism is a spherical universal joint.

7. The flexible LED filament according to claim 6, characterized in that: The spherical universal joint comprises a first connecting shaft, a first concave plate, a ball sleeve, a second connecting shaft, a second concave plate, and a ball head rotatably embedded in the ball sleeve; One end of the first connecting shaft is connected to the ball sleeve, and the other end of the first connecting shaft is connected to the first concave plate. The first concave plate is connected to the cathode terminals of the end-positioned LED chips of the plurality of the front-mounted LED chips in the light-emitting portion of the preceding position of two adjacent light-emitting portions, and the substrate. One end of the second connecting shaft is connected to the ball head, the other end of the second connecting shaft is connected to the second concave plate, and the second concave plate is connected to the positive end and substrate of the upright LED chips at the end position of several upright LED chips in the light-emitting part at the rear position of two adjacent light-emitting parts.

8. The flexible LED filament according to claim 1, characterized in that: At least the positive terminal or the negative terminal of the upright LED chip is led out through a wire.

9. The flexible LED filament according to claim 1, characterized in that: Also includes: positive terminal and negative terminal; The positive electrode terminal is connected to the positive ends of the front-mounted LED chips at the starting position in the light-emitting parts of the light-emitting parts connected in series; The negative electrode terminal is connected to the negative ends of the upright LED chips at the end positions of the plurality of upright LED chips at the end positions of the light emitting parts that are sequentially connected in series.

10. A light bulb using the flexible LED filament according to any one of claims 1 to 9, characterized in that: The light bulb comprises an insulating glass lampshade, a stem arranged in the insulating glass lampshade, and two guide wires, and the flexible LED filament is connected to the two guide wires respectively.

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