Purple light COB lamp strip

Abstract

The invention provides a purple light COB lamp strip which comprises a COB lamp strip frame body, a light-emitting containing space is arranged in the COB lamp strip frame body, a metal carrier circuit board is arranged at the bottom of the light-emitting containing space, the metal carrier circuit board comprises a positive electrode metal sheet, a negative electrode metal sheet and a plurality of LED chip bearing sheets, the positive electrode metal sheet is provided with a positive electrode conductive bonding pad, the negative electrode metal sheet is provided with a negative electrode conductive bonding pad, and the LED chip bearing sheets are arranged in the light-emitting containing space. Two lamp bead pin fixing conductive welding pads are arranged on the LED chip bearing piece, power supply pins of the purple light LED chips are fixedly welded in the lamp bead pin fixing conductive welding pads, and the positive electrode metal piece, the negative electrode metal piece and the LED chip bearing piece form a current circulation loop on a circuit through the power supply pins of the purple light LED chips. And packaging fluorescent glue for sealing, insulating and fixing is arranged outside the purple light LED chip. The beneficial effects of the invention are that the use of the purple light LED chip does not have blue light harmful to human eyes, and can meet the use requirements of people in the aspect of health.

Description

Technical Field

[0001] This invention relates to the field of LED strip technology, specifically to a purple COB LED strip. Background Technology

[0002] LED strip lights are made by soldering LED lights onto copper wires or flexible circuit boards using a special process, and then connecting them to a power source to emit light. They are named for their strip-like shape when illuminated. LED strip lights are widely used in buildings, bridges, roads, gardens, courtyards, floors, ceilings, furniture, automobiles, ponds, underwater installations, advertising, signs, and other fields for decoration or lighting. They add endless joy and festive atmosphere to various celebrations. With their strong vitality, they have entered five major advantageous markets: advertising, decoration, construction, commercial, and gifts. They are widely used in building outlines, bridges, railings, hotels, gardens, dance halls, and advertising decorations.

[0003] Among them, the light strips soldered onto the flexible printed circuit board are also called FPC light strips. FPC light strips specifically refer to light strips assembled using flexible printed circuit boards (FPC) as the carrier. Due to the flexibility and ultra-thinness of FPC, its application range is wider. The LEDs assembled on FPC light strips include surface-mount LEDs, through-hole LEDs, and flip-chip LEDs. Flip-chip LEDs are also known as COB. Surface-mount LEDs come in sizes such as 0603, 0805, 1206, 1210, 5050, and 5060, and colors such as red, yellow, blue, green, white, yellow-green, purple, and RGB seven colors. Through-hole LEDs come in sizes such as ∮3, ∮5, and ∮6, and have round heads and flat heads (commonly known as straw hat lights), and colors such as red, yellow, blue, green, and white. FPC light strips are mainly used in advertising decoration, car decoration, home decoration, etc., and can also be used in reflective vests and some other special applications. Common specifications for FPC light strips include 20cm long with 8 LEDs, 30cm long with 18 LEDs, 30cm long with 24 LEDs, 50cm long with 15 LEDs, 50cm long with 24 LEDs, and 50cm long with 30 LEDs. 60cm and 80cm lengths are also available. Different users require different specifications. Because FPC material is flexible, it can be bent, folded, and rolled freely. It can move and stretch freely in three-dimensional space without breaking. Therefore, FPC light strips can be cut or extended at will without affecting their light emission. They are suitable for use in irregular places and confined spaces. Furthermore, because they can be bent and rolled freely, they are suitable for combining various patterns in advertising decoration.

[0004] The existing COB LED strip manufacturing method involves etching circuitry onto a flexible organic material to create a carrier, then flip-chipping blue LEDs onto the carrier and encapsulating them with translucent adhesive and phosphor. This allows the strip to emit various colors of light, such as warm white, cool white, and warm yellow, while being waterproof and dustproof. However, the blue light emitted by the blue LED chip, with a wavelength of around 450 nanometers, is harmful to the human eye, and the phosphor cannot block all blue light from leaking out. Therefore, this type of COB LED strip still cannot meet people's health needs. Summary of the Invention

[0005] To address the problems in existing technologies, this invention provides a purple COB light strip. The purple COB light strip incorporates a cooperating COB light strip frame, a COB light strip cover, a metal carrier circuit board, and multiple flip-chip purple LEDs mounted on the metal carrier circuit board. These purple LEDs emit light when the positive and negative metal plates are connected to a power supply. Using purple LEDs as the light-emitting unit eliminates the presence of harmful blue light, thus meeting people's health needs. This solves the problem of blue light leakage in existing blue LED chip COB light strips, which poses a certain degree of harm to the eyes.

[0006] This invention provides a purple COB light strip, comprising a COB light strip frame, a COB light strip cover, a metal carrier circuit board, and multiple purple LED chips flip-chip mounted on the metal carrier circuit board. The COB light strip frame and the COB light strip cover are detachably and sealed together. A light-emitting space is provided within the COB light strip frame. The metal carrier circuit board is fixedly disposed at the bottom of the light-emitting space and integrally formed with the COB light strip frame. The metal carrier circuit board includes a positive electrode metal sheet, a negative electrode metal sheet, and multiple LED chip carrier sheets. An array of LED chip carrier sheets is disposed between the positive electrode metal sheet and the negative electrode metal sheet. The positive electrode metal sheet, the negative electrode metal sheet, and the LED chip carrier sheets are not in contact with each other. The positive electrode metal sheet has a positive conductive pad, and the negative electrode metal sheet... The LED chip carrier has a negative conductive pad, and two LED chip pin fixing conductive pads are respectively connected to the positive and negative conductive pads. The power supply pin of the violet LED chip is fixedly soldered in the LED chip pin fixing conductive pad. The positive metal sheet, the negative metal sheet, and the LED chip carrier form a current flow loop in the circuit through the power supply pin of the violet LED chip. The positive conductive pad, the negative conductive pad, the LED chip carrier, and the violet LED chip are covered with encapsulating fluorescent adhesive for sealing and insulation. The positive metal sheet can be connected to the positive terminal of the power supply, and the negative metal sheet can be connected to the negative terminal of the power supply. The violet LED chip can emit light when the positive and negative metal sheets are connected to the power supply.

[0007] In a further improvement, the metal carrier circuit board is an aluminum foil circuit board, and the positive electrode metal sheet, the negative electrode metal sheet, and the LED chip carrier sheet are all made of aluminum foil.

[0008] In a further improvement to the present invention, the metal carrier circuit board is further provided with multiple buffer protection resistors, which are connected in series in the current flow path of the LED chip.

[0009] In a further improvement to the present invention, a sealing ring is provided between the COB LED strip frame and the COB LED strip cover for a tight fit, and the sealing ring is made of fluororubber.

[0010] The present invention is further improved in that the COB light strip frame includes a base plate and a main frame. The main frame is made of plastic, and the base plate is made of aluminum, which is easy to dissipate heat.

[0011] The present invention is further improved in that the COB light strip cover includes a light-transmitting cover and a cover frame. The cover frame is made of plastic, and the light-transmitting cover is made of transparent glass or transparent acrylic sheet.

[0012] In a further improvement to the present invention, the metal carrier circuit board is cut from a complete aluminum foil into the positive electrode metal sheet, the negative electrode metal sheet, and multiple LED chip carrier sheets by laser cutting.

[0013] The present invention is further improved in that the width of the positive electrode metal sheet is greater than 0.5 mm, the width of the negative electrode metal sheet is greater than 0.5 mm, and the thickness of the positive electrode metal sheet, the negative electrode metal sheet, and the LED chip carrier sheet are all greater than 0.03 mm and less than 0.1 mm.

[0014] In a further improvement, the conductive pad for fixing the LED bead pin is a copper-plated pad, and the power supply pin of the purple LED chip is fixed to the conductive pad for fixing the LED bead pin by soldering.

[0015] In a further improvement to this invention, the encapsulating fluorescent adhesive is made of epoxy resin containing fluorescent powder or silicone containing fluorescent powder.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention provides a purple COB light strip, which sets a COB light strip frame, a COB light strip cover, a metal carrier circuit board and multiple purple LED chips flip-chips on the metal carrier circuit board in the purple COB light strip. The purple LED chips can emit light when the positive and negative metal plates are connected to the power supply. Using purple LED chips as the light-emitting unit can avoid the use of low-wavelength blue light that is harmful to the human eyes. Shorter wavelength purple light can be used directly. The encapsulation with encapsulating fluorescent glue can make it waterproof and dustproof while emitting light of various colors, which can meet people's health needs. The structure is simple, and the brightness of the purple LED chips in the purple COB light strip is uniform. The production cost is low and the heat dissipation is good. It solves the problem of blue light leakage in the blue LED chip COB light strip of the prior art, which is harmful to the human eyes. Attached Figure Description

[0017] To more clearly illustrate the solutions in this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a structural diagram of the ultraviolet COB light strip of the present invention; Figure 2 This is a top view of the structure of the ultraviolet COB light strip of the present invention; Figure 3This is a cross-sectional view of the ultraviolet COB light strip of the present invention.

[0019] In the diagram, 1-COB LED strip frame, 2-COB LED strip cover, 3-metal carrier circuit board, 31-buffer protection resistor, 4-violet LED chip, and 5-sealing ring. Detailed Implementation

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein in the specification of the application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having” and any variations thereof in the specification, claims and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0021] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0022] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.

[0023] like Figures 1-3As shown, the present invention provides a purple COB light strip, including a COB light strip frame 1, a COB light strip cover 2, a metal carrier circuit board 3, and multiple purple LED chips 4 flip-chip mounted on the metal carrier circuit board. The COB light strip frame 1 and the COB light strip cover 2 are detachably and sealed together. The COB light strip frame 1 has a light-emitting space inside. The metal carrier circuit board 3 is fixedly disposed at the bottom of the light-emitting space and integrally formed with the COB light strip frame. The metal carrier circuit board 3 includes a positive electrode metal sheet, a negative electrode metal sheet, and multiple LED chip carrier sheets. The LED chip carrier sheet array is disposed between the positive electrode metal sheet and the negative electrode metal sheet. The positive electrode metal sheet, the negative electrode metal sheet, and the LED chip carrier sheets do not contact each other. The positive electrode metal sheet has a positive conductive pad, the negative electrode metal sheet has a negative conductive pad, and the LED chip carrier sheets have two pads respectively connected to the positive conductive pad and the negative conductive pad. The LED chip pins are fixed to conductive pads, and the power supply pins of the violet LED chip 4 are fixedly soldered inside the conductive pads. The positive electrode metal sheet, negative electrode metal sheet, and LED chip carrier sheet form a current flow loop in the circuit through the power supply pins of the violet LED chip 4. The positive electrode conductive pad, negative electrode conductive pad, LED chip carrier sheet, and violet LED chip are all covered with encapsulating fluorescent adhesive for sealing and insulation. The positive electrode metal sheet can be connected to the positive terminal of the power supply, and the negative electrode metal sheet can be connected to the negative terminal of the power supply. The violet LED chip can emit light when the positive electrode metal sheet and negative electrode metal sheet are connected to the power supply. The metal carrier circuit board 3 is an aluminum foil circuit board. The positive electrode metal sheet, negative electrode metal sheet, and LED chip carrier sheet are all made of aluminum foil. The metal carrier circuit board 3 is also equipped with multiple buffer protection resistors 31, which are connected in series in the current flow loop of the LED chip. In this embodiment, when the positive metal plate is connected to the positive terminal of the power supply and the negative metal plate is connected to the negative terminal of the power supply, the violet LED chip, the LED chip carrier, the positive metal plate, the negative metal plate, and the power supply form a closed-loop circuit. The violet LED chip can then emit light. Using the violet LED chip as the light-emitting unit, and sealing it with encapsulating fluorescent adhesive, it can emit various colors of light while being waterproof and dustproof, without emitting harmful blue light, thus meeting people's health needs. All violet LED chips directly use aluminum foil as the circuit carrier, resulting in a wide conductive line and minimizing the impact of voltage drop, ensuring uniform brightness of the violet LED chip. Furthermore, the heat dissipation performance of the aluminum foil circuit board is much better than that of flexible organic materials, and the price of aluminum foil is much cheaper than that of organic materials used in strip-shaped flexible circuit boards. Therefore, compared to blue COB light strips, it significantly reduces production costs. The surface of the aluminum foil rapidly oxidizes to form an insulating aluminum oxide protective film, which not only prevents corrosion and improves the lifespan of the violet COB light strip but also enhances its safety.

[0024] like Figures 1-3As shown, a tightly fitting sealing ring 5 is provided between the COB light strip frame 1 and the COB light strip cover 2. The sealing ring 5 is made of fluoropolymer. The COB light strip frame includes a base plate and a main frame. The main frame is made of plastic, and the base plate is made of easily heat-dissipating aluminum. The COB light strip cover includes a light-transmitting cover and a cover frame. The cover frame is made of plastic, and the light-transmitting cover is made of transparent glass or transparent acrylic sheet. The encapsulating fluorescent adhesive is made of epoxy resin containing phosphor or silicone containing phosphor. In this embodiment, the sealing ring made of fluoropolymer has the characteristics of high temperature resistance, corrosion resistance, and long service life. It can protect the metal carrier circuit board and multiple flip-chip UV LEDs on the metal carrier circuit board in the light-emitting space, greatly improving the service life of the UV COB light strip. The aluminum foil base plate can further improve the heat dissipation capacity of the UV COB light strip. Epoxy resins are all high molecular weight polymers with the molecular formula (C11H12O3)n. They refer to a class of polymers containing two or more epoxy groups in their molecules. They are condensation products of epichlorohydrin and bisphenol A or polyols. Due to the chemical reactivity of the epoxy groups, they can be ring-opened and cured with various compounds containing active hydrogen to form a network structure. Therefore, it is a thermosetting resin with good light transmittance, dustproof, waterproof, and insulating properties. Silica gel (also known as silica gel) is a highly active adsorbent material, an amorphous substance with the chemical formula mSiO2·nH2O. It does not react with any substance except strong alkalis and hydrofluoric acid, is insoluble in water and any solvent, is non-toxic and odorless, and has stable chemical properties. Different types of silica gel form different microporous structures due to different manufacturing methods. The chemical composition and physical structure of silica gel determine that it has many characteristics that are difficult for other similar materials to replace, such as high adsorption performance, good thermal stability, stable chemical properties, and high mechanical strength. In this embodiment, epoxy resin or silicone containing phosphor is used as the material for encapsulating the light-transmitting adhesive, which can improve the service life and safety of the purple COB light strip, and at the same time make the brightness of the purple LED chip more uniform.

[0025] like Figures 1-3As shown, the metal carrier circuit board is made of a complete aluminum foil, which is laser-cut into positive electrode metal sheets, negative electrode metal sheets, and multiple LED chip carrier sheets. The width of the positive electrode metal sheet is greater than 0.5 mm, the width of the negative electrode metal sheet is greater than 0.5 mm, and the thickness of the positive electrode metal sheet, negative electrode metal sheet, and LED chip carrier sheet is greater than 0.03 mm and less than 0.1 mm. The conductive pads for fixing the LED chip pins are copper-plated pads, and the power supply pins of the purple LED chips are fixed to the conductive pads for fixing the LED chip pins by soldering. In this embodiment, the circuit of the purple COB light strip does not require etching. It is directly formed by laser-cutting a metal carrier to create positive and negative electrode metal sheets and LED chip carrier sheets, resulting in low production costs and high production efficiency. The width of the conductive positive and negative electrode metal sheets is greater than 0.5mm, significantly wider than the circuit etched onto flexible organic materials in FPC light strips. This minimizes current limitation during conduction, reducing the voltage drop impact on the purple LED chip and ensuring uniform brightness, thus greatly improving the user experience. The conductive pads are copper-plated, meaning copper is plated onto the metal carrier. The power supply pins are directly soldered to the conductive pads using a die bonder, resulting in a stable and robust structure. The die bonder uses a die bonder for hot melt bonding, which is highly efficient, simple to operate, eliminates the need for tinning, and ensures stable soldering quality. A buffer protection resistor protects electrical components from burnout due to excessive or abnormal current.

[0026] As can be seen from the above, the present invention provides a purple COB light strip. By incorporating a COB light strip frame, a COB light strip cover, a metal carrier circuit board, and multiple flip-chip purple LEDs on the metal carrier circuit board, the purple LEDs emit light when the positive and negative metal plates are connected to a power supply. Using purple LEDs as the light-emitting unit avoids the use of low-wavelength blue light that is harmful to the human eye, directly using shorter wavelength purple light. Furthermore, sealing it with encapsulating fluorescent adhesive allows it to emit light of various colors while being waterproof and dustproof, meeting people's health needs. The structure is simple, and the purple LEDs in the purple COB light strip have uniform brightness, low production cost, and good heat dissipation. This solves the problem of blue light leakage in existing blue LED chip COB light strips, which poses a certain degree of harm to the human eye.

[0027] The specific embodiments described above are preferred embodiments of the present invention and are not intended to limit the specific scope of the present invention. The scope of the present invention includes, but is not limited to, these specific embodiments. All equivalent changes made in accordance with the present invention are within the protection scope of the present invention.

Claims

1. A purple COB light strip, characterized in that: The device includes a COB LED strip frame, a COB LED strip cover, a metal carrier circuit board, and multiple flip-chip ultraviolet LEDs mounted on the metal carrier circuit board. The COB LED strip frame and the COB LED strip cover are detachably and sealed together. The COB LED strip frame has a light-emitting space within it. The metal carrier circuit board is fixedly disposed at the bottom of the light-emitting space and integrally formed with the COB LED strip frame. The metal carrier circuit board includes a positive electrode metal sheet, a negative electrode metal sheet, and multiple LED chip carrier sheets. The LED chip carrier sheet array is disposed between the positive electrode metal sheet and the negative electrode metal sheet. The positive electrode metal sheet, the negative electrode metal sheet, and the LED chip carrier sheets do not contact each other. The positive electrode metal sheet has a positive conductive pad, and the negative electrode metal sheet has a negative conductive pad. The LED chip carrier has two LED pin fixing conductive pads connected to the positive and negative conductive pads respectively. The power supply pin of the violet LED chip is fixedly soldered into the LED pin fixing conductive pad. The positive metal sheet, the negative metal sheet, and the LED chip carrier form a current flow loop in the circuit through the power supply pin of the violet LED chip. The positive conductive pad, the negative conductive pad, the LED chip carrier, and the violet LED chip are covered with encapsulating fluorescent adhesive for sealing and insulation. The positive metal sheet can be connected to the positive terminal of the power supply, and the negative metal sheet can be connected to the negative terminal of the power supply. The violet LED chip can emit light when the positive and negative metal sheets are connected to the power supply.

2. The ultraviolet COB light strip according to claim 1, characterized in that: The metal carrier circuit board is an aluminum foil circuit board, and the positive electrode metal sheet, the negative electrode metal sheet, and the LED chip carrier sheet are all made of aluminum foil.

3. The ultraviolet COB light strip according to claim 2, characterized in that: The metal carrier circuit board is also provided with multiple buffer protection resistors, which are connected in series in the current flow path of the LED chip.

4. The ultraviolet COB light strip according to claim 3, characterized in that: A sealing ring is provided between the COB LED strip frame and the COB LED strip cover to ensure a tight fit. The sealing ring is made of fluororubber.

5. The ultraviolet COB light strip according to claim 4, characterized in that: The COB light strip frame includes a base plate and a main frame. The main frame is made of plastic, and the base plate is made of aluminum, which is easy to dissipate heat.

6. The ultraviolet COB light strip according to claim 5, characterized in that: The COB light strip cover includes a light-transmitting cover and a cover frame. The cover frame is made of plastic, and the light-transmitting cover is made of transparent glass or transparent acrylic sheet.

7. The ultraviolet COB light strip according to claim 6, characterized in that: The metal carrier circuit board is made by laser cutting a complete aluminum foil into the positive electrode metal sheet, the negative electrode metal sheet, and multiple LED chip carrier sheets.

8. The ultraviolet COB light strip according to claim 7, characterized in that: The width of the positive electrode metal sheet is greater than 0.5 mm, the width of the negative electrode metal sheet is greater than 0.5 mm, and the thickness of the positive electrode metal sheet, the negative electrode metal sheet, and the LED chip carrier sheet is greater than 0.03 mm and less than 0.1 mm.

9. The ultraviolet COB light strip according to claim 8, characterized in that: The conductive pads for fixing the LED bead pins are copper-plated pads, and the power supply pins of the purple LED chip are fixed to the conductive pads for fixing the LED bead pins by soldering.

10. The ultraviolet COB light strip according to claim 9, characterized in that: The encapsulating fluorescent adhesive is made of epoxy resin containing fluorescent powder or silicone containing fluorescent powder.

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