CN107035979A - A kind of bent filament bar and the LED filament lamp using the filament bar - Google Patents

Abstract

The invention discloses a bendable filament strip and an LED filament lamp using the filament strip. The filament strip includes a metal circuit board that can be folded into a spiral shape, and terminal metal electrodes are provided at both ends of the filament strip, and it has a printed circuit board. , the printed circuit is composed of multiple columns of parallel lines evenly spaced along the length direction and multiple connecting lines, one of the terminal metal electrodes is connected to the first column of parallel lines, and the other terminal metal electrode is connected to the last column of parallel lines. The parallel lines are connected by connecting lines. The parallel lines include two sub-circuits arranged in parallel along the width direction. Metal solder joints are provided at both ends of the sub-circuits. The corresponding two metal solder joints in the width direction are connected by metal solder joints. The LED chip is connected in the form of a wire, and the back of the metal circuit board is evenly spaced along the length direction with a number of parallel inclined folding line grooves, and its position does not correspond to the position of the metal wire and the LED chip; the advantage is that the conventional metal circuit board and metal Wire technology to reduce costs.

Description

A bendable filament strip and LED filament lamp using the filament strip

technical field

The invention relates to a filament and an LED filament lamp, in particular to a bendable filament strip and an LED filament lamp using the filament strip.

Background technique

LED filament lamps have been widely used in people's homes. The filaments in most LED filament lamps are composed of multiple LED strips connected together. Conventional LED strips are rigid strips, which include a hard substrate and are bonded to the hard substrate. Multiple LED chips are connected together by metal bonding. This kind of LED filament lamp, on the one hand, because there are many solder joints between the LED light bars and between the LED light bar and the driving power supply, it is not convenient to assemble and connect; on the other hand, the luminous angle is not enough big.

In order to solve the problems of rigid light strips, LED flexible light strips have been developed. LED flexible light strips are easy to bend into various shapes, such as spirals, etc., so that the LED filament lamps using the LED flexible light strips have fewer solder joints, and The beam angle is increased, much like a traditional incandescent lamp. Existing LED flexible light strips usually use a soft substrate. If the LED chips that are installed are connected by metal bonding, the metal wires connecting the LED chips will easily break when the soft substrate is bent and folded. Obviously, this LED chip installation method It is not applicable, so a layer of printed circuit layer must be etched on the soft substrate first, and then the flip-chip LED chips are soldered on the printed circuit layer to connect them. However, this increases the cost of LED flexible light strips and is not suitable for use with this LED The popularity of LED filament lamps with flexible light strips.

Contents of the invention

The technical problem to be solved by the present invention is to provide a bendable filament strip which adopts conventional metal circuit board and metal bonding technology to reduce cost, and an LED filament lamp using the filament strip.

The technical solution adopted by the present invention to solve the above technical problems is: a bendable filament strip, which is characterized in that it includes a thin metal circuit board that can be folded into a spiral shape, and the two ends of the metal circuit board are respectively arranged There are terminal metal electrodes, and the metal circuit board has a printed circuit, and the printed circuit is composed of a plurality of parallel lines and a plurality of connecting lines distributed evenly along the length direction of the metal circuit board, one of which is The terminal metal electrode described above is connected to the parallel lines described in the first column, the other terminal metal electrode is connected to the parallel lines described in the last column, and the parallel lines described in two adjacent columns are connected through the connecting lines , the connecting circuit is located in the gap between two adjacent columns of the parallel circuits, each column of the parallel circuits includes two sub-circuits arranged in parallel and at intervals along the width direction of the metal circuit board, each Each of the two ends of the sub-circuits is provided with a metal soldering point, and the two metal soldering points corresponding to the positions on the two sub-circuits in each row of the parallel circuits are connected by metal bonding. A plurality of LED chips are connected in series or in parallel through the printed circuit, all the LED chips are coated with fluorescent glue, and the back of the metal circuit board is along the The length direction of the metal circuit board is engraved with a plurality of parallel oblique folding line slots at even intervals, and the oblique folding line slots span the width direction of the metal circuit board, and the positions of the oblique folding line slots and The positions of the metal wires do not correspond to the positions of the LED chips.

The first sub-circuit in the parallel lines in the previous column of the two adjacent parallel lines and the second sub-circuit in the parallel lines in the next column pass through one of the The connection line is connected, the second sub-line in the parallel lines in the first column is connected to one of the terminal metal electrodes, and the first sub-line in the parallel lines in the last column Connect with another terminal metal electrode described above.

The metal circuit board is composed of a metal substrate, a lower insulating layer arranged on the front surface of the metal substrate, the printed circuit printed on the upper surface of the lower insulating layer, and the printed circuit arranged on the printed circuit board. The upper insulating layer is formed on the area where the metal soldering point is not arranged on the circuit, and the oblique folding line groove is engraved on the back side of the metal substrate. Here, the metal substrate is an aluminum substrate, a copper substrate, an iron substrate, or the like.

The metal wires connected to the LED chips are also coated with fluorescent glue, which can protect the metal wires; in practice, in order to facilitate coating, generally speaking, the upper insulating layer, Fluorescent glue is coated on the entire area where the metal wires and LED chips are located; it is also possible to choose not to coat the fluorescent glue at the fold, that is, the position corresponding to the inclined folding line groove. Here, the metal wires are gold wires, copper wires, aluminum wires, or alloy wires.

The surface of the metal solder joint is plated with a silver layer without an upper insulating layer.

An LED filament lamp using the above-mentioned bendable filament strip, comprising a stem, a helical LED filament is installed on the stem of the stem, characterized in that the LED filament is composed of the The bendable filament strip is folded, and the two terminal metal electrodes in the bendable filament strip are connected to the two metal guide wires on the stem column in one-to-one correspondence.

Compared with the prior art, the present invention has the advantages of:

1) The metal circuit board installed with LED chips can be folded into a spiral LED filament according to the inclined folding line groove. When the LED filament is applied to the LED filament lamp, only the free ends of the two metal electrodes need to be connected to the external circuit by welding , such as welding connection with the driving power supply, that is, there are only two solder joints, few solder joints, simple assembly, and because the LED filament is in a spiral shape, the light-emitting angle is large.

2) Since the position of the inclined folding line groove does not correspond to the position of the metal wire, it also does not correspond to the position of the LED chip, that is, there are only sub-circuits or connecting lines at the inclined folding line groove, and there are no metal wires and LED chips, so LED chips are installed. When the metal circuit board of the chip is folded, the metal wire will not be broken, and the LED chip will not be affected.

3) Only conventional metal circuit boards and metal bonding techniques are required, thus effectively reducing manufacturing costs.

4) LED filament lamps using bendable filament strips have fewer solder joints during assembly, and the assembly and connection are convenient; the luminous angle is large; and because only conventional metal circuit boards and metal bonding techniques are used, it effectively reduces The cost of the LED filament lamp is suitable for popularization of the LED filament lamp.

Description of drawings

Figure 1a is a schematic diagram of the overall structure of the bendable filament strip (not coated with fluorescent glue) of the present invention;

Figure 1b is an enlarged schematic view of part A in Figure 1a;

Figure 2a is a schematic diagram of the overall structure of the bendable filament strip (coated with fluorescent glue) of the present invention;

Figure 2b is an enlarged schematic view of part B in Figure 2a;

3 is a schematic structural view of a helical LED filament folded from a bendable filament strip of the present invention;

Fig. 4 is a schematic structural view of an LED filament lamp using a helical LED filament folded from a bendable filament strip of the present invention.

detailed description

The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

Embodiment one:

A kind of bendable filament strip that present embodiment proposes, as shown in Fig. 1a, Fig. 1b, Fig. 2a and Fig. 2b, it comprises the thin metal circuit board 1 that can be folded into spiral shape, the metal circuit board 1 Terminal metal electrodes 2 are provided at both ends, and the metal circuit board 1 has a printed circuit 3, which is a copper circuit. The connection line 31 is composed of one terminal metal electrode 2 connected to the first column of parallel lines, and the other end metal electrode 2 is connected to the last column of parallel lines. Two adjacent columns of parallel lines are connected through the connection line 31. In the gap 32 between two rows of parallel circuits, each row of parallel circuits includes two sub-circuits 33 arranged in parallel and spaced along the width direction of the metal circuit board 1, and each of the two ends of each sub-circuit 33 is provided with a metal pad 4, each LED chips 5 are connected between the two metal pads 4 corresponding to the positions of the two sub-circuits 33 in the parallel lines (that is, corresponding to the positions along the width direction of the metal circuit board 1) through metal bonding. The chips 5 are connected in series or in series and parallel through the printed circuit 3, all the LED chips 5 are coated with fluorescent glue 6, and the back of the metal circuit board 1 is engraved with a plurality of parallel oblique folding line slots evenly spaced along the length direction of the metal circuit board 1 7. The oblique folding wire groove 7 spans the width direction of the metal circuit board 1 , and the position of the oblique folding wire groove 7 does not correspond to the position of the metal wire 51 , nor does it correspond to the position of the LED chip 5 . The metal circuit board 1 installed with the LED chip 5 can be folded into a spiral LED filament according to the inclined folding line groove 7. When the LED filament is applied to the LED filament lamp, only the free ends of the two terminal metal electrodes 2 need to be connected to the external circuit. Welding connection, such as welding connection with the driving power supply, that is, there are only two soldering points, few soldering points, simple assembly, and because the LED filament is in a spiral shape, the luminous angle is large; It does not correspond, nor does it correspond to the position of the LED chip 5, that is, there are only sub-circuits 33 or connecting lines 31 at the inclined folding line groove 7, and there are no metal wires 51 and LED chips 5, so the metal circuit board 1 with the LED chip 5 installed is folded It will not cause the metal wire 51 to break, nor will it affect the LED chip 5; it only needs to use the conventional metal circuit board 1 and metal wire bonding technology, so the manufacturing cost is effectively reduced; It is converted into white light; the height of the helix formed by folding the metal circuit board 1 mounted with the LED chip 5 is determined by the inclination angle of the inclined folding line groove 7 .

In this embodiment, the first sub-circuit 33 in the previous parallel line of the two adjacent parallel lines is connected to the second sub-circuit 33 in the next parallel line through a connecting line 31, and the first parallel line The second sub-circuit 33 of the second sub-circuit 33 is connected to one of the terminal metal electrodes 2, and the first sub-circuit 33 in the last column of parallel circuits is connected to the other terminal metal electrode 2.

In this embodiment, the metal circuit board 1 is composed of a metal substrate (not shown in the figure), a lower insulating layer (not shown in the figure) arranged on the front surface of the metal substrate, and an insulating layer printed on the upper surface of the lower insulating layer. The printed circuit 3 is composed of an upper insulating layer (not shown in the figure) disposed on the area of the printed circuit 3 that is not provided with the metal solder joint 4, and the oblique folding line groove 7 is engraved on the back of the metal substrate. Here, the metal substrate is an aluminum substrate, a copper substrate, an iron substrate, or the like.

In this embodiment, the metal wire 51 connected to the LED chip 5 is also coated with fluorescent glue 6, and the fluorescent glue 6 is coated on the outside of the metal wire 51 to protect the metal wire 51; In general, apply fluorescent glue 6 on the entire area where the upper insulating layer, metal wire 51, and LED chip 5 are located; you can also choose not to apply fluorescent glue 6 at the fold, that is, the position corresponding to the inclined folding line groove 7. Here, the metal wire 51 is a gold wire, a copper wire, an aluminum wire, or an alloy wire.

In this embodiment, the surface of the metal pad 4 is plated with a silver layer (not shown in the figure), without an upper insulating layer.

When designing the bendable filament strip, more than two sub-circuits 33 can be designed in each parallel circuit, and the connection of the sub-circuits 33 in two adjacent parallel circuits through the connection circuit 31 can be based on the above-mentioned To determine the connection mode, it is only necessary to ensure that the LED chips 5 are connected in series or in series and parallel through the printed circuit 3 .

FIG. 3 shows the structure of the helical LED filament formed by folding the above-mentioned bendable filament strip.

Embodiment two:

This embodiment proposes an LED filament lamp using the bendable filament strip given in Embodiment 1, as shown in Figure 4, which includes a lamp base 91, a glass bulb 92, and a driving power supply ( Not shown in the figure), the stem 93, the LED filament 94 in the form of a spiral (as shown in Figure 3), the LED filament 94 is installed on the stem 931 of the stem 93 in the form of sheathing, and the LED filament 94 can be formed by The bent filament strip is folded, and the two end metal electrodes 2 in the bendable filament strip are connected to the two metal guide wires 932 on the stem 93 in one-to-one correspondence, and the stem 93 loaded with the LED filament 94 is placed Placed in the glass bulb 92, the trumpet tube 933 of the stem 93 is welded to the mouth of the glass bulb 92, so that the stem 93 and the glass bulb 92 form a closed cavity 95, which is filled with protective gas or heat conduction For gas, two metal guide wires 932 on the stem 93 extend out of the stem 93 to connect with the driving power provided in the lamp cap 91 , and the lamp cap 91 and the glass bulb 92 are bonded and fixed.

Claims (6)

1. A bendable filament strip, characterized in that it includes a metal circuit board that can be folded into a spiral shape, the two ends of the metal circuit board are respectively provided with terminal metal electrodes, and the metal circuit board There is a printed circuit in it, and the printed circuit is composed of a plurality of rows of parallel lines and a plurality of connecting lines distributed evenly along the length direction of the metal circuit board, wherein one of the terminal metal electrodes and the first column of the The other terminal metal electrode is connected to the parallel line in the last column, the parallel lines in two adjacent columns are connected through the connecting line, and the connecting line is located in two adjacent columns In the gap between the parallel lines, each column of the parallel lines includes two sub-circuits arranged in parallel and at intervals along the width direction of the metal circuit board, and each of the two ends of the sub-circuits is respectively set There are metal solder joints, and LED chips are connected between the two metal solder joints corresponding to the positions on the two sub-circuits in each column of the parallel lines through metal bonding. The LED chips are connected in series or in series and parallel through the printed circuit, all the LED chips are coated with fluorescent glue, and the back of the metal circuit board is evenly spaced along the length direction of the metal circuit board. a plurality of parallel inclined folding line slots, the inclined folding line slots span the width direction of the metal circuit board, the positions of the inclined folding line slots do not correspond to the positions of the metal lines, and It also does not correspond to the position of the LED chip. 2. A bendable filament strip according to claim 1, characterized in that the first sub-circuit in the parallel lines in the previous column of the two adjacent parallel lines is the same as the rear The second sub-circuit in the parallel lines in a column is connected by a connection line, and the second sub-circuit in the parallel lines in the first column is connected to one of the terminals. The metal electrodes are connected, and the first sub-circuit in the parallel lines in the last column is connected to the other terminal metal electrode. 3. A bendable filament strip according to claim 1 or 2, characterized in that the metal circuit board is composed of a metal substrate, a lower insulating layer arranged on the front surface of the metal substrate, printed on The printed circuit on the upper surface of the lower insulating layer is composed of the upper insulating layer arranged on the area where the metal solder joint is not provided on the printed circuit, and the inclined folding line groove engraved on the back of the metal substrate. 4. A bendable filament strip according to claim 3, characterized in that the metal wires connecting the LED chips are also coated with fluorescent glue. 5. A bendable filament strip according to claim 4, characterized in that the surface of the metal solder joint is plated with a silver layer. 6. An LED filament lamp using the bendable filament strip according to claim 1, comprising a stem, and a helical LED filament is installed on the stem of the stem, characterized in that the The LED filament is folded from the bendable filament strip, the two terminal metal electrodes in the bendable filament strip and the two metal guide wires on the stem are one by one corresponding connection.