CN216896913U - Bending resistant COB light bar structure - Google Patents

Abstract

The utility model provides a bending-resistant COB light bar structure, comprising: a flexible circuit board, a ground wire conducting strip and a positive electrode conducting strip which are parallel to each other are arranged on the flexible circuit board; A plurality of groups of LED lamps connected in series are arranged in parallel in the gap, and each group of LED lamps includes three LED chips arranged in parallel; A rectangular conductive strip. The utility model is provided with a first I-shaped structure and a second I-shaped structure on the entire series circuit of the flexible circuit board, which ensures sufficient load current of the FPC copper foil and reduces the increase in the structural internal stress of the FPC caused by the distortion of the COB light bar. The problem of large resistance and LED chip desoldering.

Description

Bending resistant COB light bar structure

technical field

The utility model relates to the field of light bars, in particular to a bending-resistant COB light bar structure.

Background technique

The COB light bar in the prior art is arranged in the FPC design circuit, the copper foil of the FPC is etched to form a circuit, and three LED chips are connected in parallel to form a group, a total of 7 groups of LED chips are connected in series, and three resistors are designed on the series circuit, DC24V Constant voltage drive; FPC is soft and easy to bend, which is convenient for the installation and modeling of COB light strips. By printing solder paste on the corresponding Pad, placing the LED chip and the resistor, and after reflow soldering, a strip of silica gel is applied to the surface of the LED and the resistor for protection and auxiliary lighting.

However, due to the limitation of chip and resistor size, the thrust cannot be effectively improved, and the characteristics of COB light strips are easy to install and shape, so that the FPC of COB light strips is twisted and bent during use, causing the LED chips, resistors and pads to loosen and fall off. , causing the functional failure of the COB light bar.

Utility model content

The utility model provides a bending-resistant COB light bar structure to solve at least one of the above technical problems.

In order to solve the above problems, as an aspect of the present utility model, a bending-resistant COB light bar structure is provided, comprising: a flexible circuit board, which is provided with a ground wire conductive strip and a positive conductive strip parallel to each other. , a plurality of groups of LED lamps connected in series are arranged in parallel in the gap between the ground wire conductive strip and the positive electrode conductive strip, and each group of LED lamps includes three LED chips arranged in parallel; the ground wire conductive strip is conductive towards the positive electrode One side of the strip is provided with three first rectangular conductive strips in a direction perpendicular to the ground wire conductive strip, wherein the length of the first rectangular conductive strip in the middle is less than the length of the two first rectangular conductive strips on both sides, and the length of the first rectangular conductive strip on both sides is The two first rectangular conductive strips are connected through a second rectangular conductive strip, and one end of the first rectangular conductive strip in the middle is connected to the second rectangular conductive strip; one end of each first rectangular conductive strip is connected by a first rectangular conductive strip. A reduced diameter conductive strip is connected to one end of an LED chip in the first group of LED lamps, and the other end of the LED chips in the first group of LED lamps is connected to one end of a third rectangular conductive strip through a second reduced diameter conductive strip respectively , the third rectangular conductive strip is connected to the next group of LED lights; wherein, the first rectangular conductive strip on both sides and the second rectangular conductive strip together form a first I-shaped structure, the third rectangular conductive strip and the second reduced diameter conductive strip , the LED chip, the first reduced-diameter conductive strip, and the first rectangular conductive strip together form a second I-shaped structure.

Preferably, the LED chips in each group of LED lamps adopt the second I-shaped structure.

Preferably, the connection structure between the last group of LED lamps and the anode conductive strip is the same as the connection structure between the first group of LED lamps and the ground wire conductive strip.

The utility model is provided with a first I-shaped structure and a second I-shaped structure on the entire series circuit of the flexible circuit board, which ensures sufficient load current of the FPC copper foil and reduces the increase in the structural internal stress of the FPC caused by the distortion of the COB light bar. The problem of large resistance and LED chip desoldering.

Description of drawings

FIG. 1 schematically shows the structure diagram of the present invention.

Reference signs in the figure: 1, flexible circuit board; 2, ground wire conductive strip; 3, positive conductive strip; 4, LED chip; 5, first rectangular conductive strip; 6, second rectangular conductive strip; 7, first Reduced diameter conductive strip; 8. Second reduced diameter conductive strip; 9. Third rectangular conductive strip; 10. First I-shaped structure; 11. Second I-shaped structure.

Detailed ways

Embodiments of the present invention are described in detail below, but the present invention can be implemented in many different ways as defined and covered by the claims.

As an aspect of the present invention, a bending-resistant COB light bar structure is provided, comprising: a flexible circuit board (FPC) 1, on which are provided with parallel ground conductor bars 2 and positive conductors Strip 3, a plurality of groups of LED lamps connected in series are arranged in parallel in the gap between the ground wire conductive strip 2 and the positive conductive strip 3, and each group of LED lamps includes three LED chips 4 arranged in parallel; the ground wire conducts electricity The side of the bar 2 facing the positive electrode conductive bar 3 is provided with three first rectangular conductive bars 5 in a direction perpendicular to the ground conductive bar 2, wherein the length of the first rectangular conductive bar 5 in the middle is less than the length of the two on both sides. The length of the first rectangular conductive strip 5, the two first rectangular conductive strips 5 on both sides are connected by the second rectangular conductive strip 6, and one end of the first rectangular conductive strip 5 in the middle is connected with the second rectangular conductive strip 6 Connection; one end of each first rectangular conductive strip 5 is connected to one end of one LED chip 4 in the first group of LED lamps through a first reduced diameter conductive strip 7, and the other end of the LED chip 4 in the first group of LED lamps is connected. One end is connected to one end of the third rectangular conductive bar 9 through a second reduced diameter conductive bar 8 respectively, and the third rectangular conductive bar 9 is connected to the next group of LED lights; wherein, the first rectangular conductive bar 5 on both sides is connected to the second The rectangular conductive strips 6 together form the first I-shaped structure 10 , the third rectangular conductive strips 9 , the second reduced diameter conductive strips 8 , the LED chips 4 , the first reduced diameter conductive strips 7 , and the first rectangular conductive strips 5 together form the second I-shaped structure 11.

Preferably, the LED chips in each group of LED lamps adopt the second I-shaped structure 11 .

Preferably, the connection structure between the last group of LED lamps and the anode conductive strip 3 is the same as the connection structure between the first group of LED lamps and the ground wire conductive strip 2 .

In the above technical solution, the present invention is provided with a first I-shaped structure 10 and a second I-shaped structure 11 on the entire series circuit of the flexible circuit board, wherein the first group of LED lights and the last group of LED lights are positive and negative. The first I-shaped structure 10 is used for the connection between the poles, and the second I-shaped structure 11 is used in the interior of each group of LED lamps, which ensures the sufficient load current of the FPC copper foil and reduces the distortion of the COB light bar. The problem of resistance and LED chip desoldering caused by the increase of internal stress.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. For those skilled in the art, the present utility model may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims (3)

1. A bending-resistant COB light bar structure, characterized in that it comprises: a flexible circuit board (1), on which the flexible circuit board (1) is provided with a ground conductor bar (2) and a positive conductor bar that are parallel to each other (3), a plurality of groups of LED lamps connected in series are arranged in parallel in the gap between the ground wire conductive strip (2) and the positive conductive strip (3), and each group of LED lamps includes three LED chips (4) arranged in parallel. ); the side of the ground wire conductive strip (2) facing the positive conductive strip (3) is provided with three first rectangular conductive strips (5) in a direction perpendicular to the ground wire conductive strip (2), wherein the middle The length of the first rectangular conductive strip (5) is less than the length of the two first rectangular conductive strips (5) on both sides, and the second rectangular conductive strip ( 6) Connection, one end of the first rectangular conductive strip (5) in the middle is connected to the second rectangular conductive strip (6); one end of each first rectangular conductive strip (5) passes through a first reduced diameter conductive strip (7) Connect to one end of an LED chip (4) in the first group of LED lamps, and the other end of the LED chip (4) in the first group of LED lamps is connected to the first group of LED lamps through a second reduced diameter conductive strip (8) respectively. One end of the three rectangular conductive strips (9) is connected, and the third rectangular conductive strip (9) is connected to the next group of LED lights; wherein, the first rectangular conductive strips (5) on both sides and the second rectangular conductive strips (6) share the same A first I-shaped structure (10), a third rectangular conductive strip (9), a second reduced diameter conductive strip (8), an LED chip (4), a first reduced diameter conductive strip (7), and a first rectangular conductive strip are formed (5) The second I-shaped structure (11) is formed together. 2 . The bending-resistant COB light bar structure according to claim 1 , wherein the LED chips in each group of LED lights adopt the second I-shaped structure ( 11 ). 3 . 3. The bending-resistant COB light bar structure according to claim 1, wherein the connection structure between the last group of LED lights and the positive electrode conductive strip (3) is the same as that of the first group of LED lights and the ground wire conductive bar (3). 2) The connection structure between them is the same.

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