CN202423377U - Waterproof SMD LED - Google Patents

Abstract

The utility model discloses a waterproof SMD (Surface-mount Device) LED, which comprises a circuit substrate, an LED wafer and a waterproof adhesive layer, wherein the circuit substrate comprises a metal sheet and a support frame of a resin reflective cup, the metal sheet is welded on the circuit substrate via soldering tin, and packing adhesive is filled in the resin reflective cup; the LED wafer is fixedly arranged at the bottom of the resin reflective cup, and the positive and the negative poles of the LED wafer are electrically connected with the positive and the negative poles of the metal sheet via wires; the waterproof adhesive layer is coated on the external surface of the support frame. According to the utility model, after an LED is welded on the circuit substrate, the waterproof adhesive layer is coated on the surface of the LED, therefore, a waterproof effect of the LED is achieved, and the LED has the advantages of easiness in implement, low raw material cost, wide application range and good waterproof effect.

Description

A kind of paster LED of waterproof

Technical field

The utility model relates to the package assembly of a kind of LED, especially relates to a kind of LED of waterproof paster package assembly.

Background technology

In recent years, adopting surface mounted LED became a development focus, had solved problems such as brightness, visual angle, evenness, consistency well, was fit to very much the application of high-resolution indoor, outdoor full color display screen and outdoor building brightening.But this paster LED self exists water proofing property difference and the low problem of reliability, has seriously limited its application out of doors.

The waterproof difficult point of adopting surface mounted LED mainly contains two aspects and causes:

The one, the infiltration of led support.The infiltration of led support is caused by the material of support and the contact-making surface of material and electrode pin.The support of adopting surface mounted LED is that plastics and metal electrode compression moulding are obtained at present, and used plastic material is polyphtalamide (being called for short PPA), and the metal electrode material has copper, aluminium etc.The weakness of the support of this material structure aspect waterproof is: 1) the easy moisture absorption of PPA material, water absorption rate about 6%; 2) there is the slit in the contact-making surface between PPA and the metal electrode pin, and this slit can be after Reflow Soldering and follow-up LED use in become big, thereby make impurity invasion such as steam.

The 2nd, the infiltration of LED encapsulation glue-line.The packaging plastic that LED uses mainly is epoxy resin and silicones (polyorganosiloxane resin).The thermal coefficient of expansion of epoxy resin or silicones is different with led support, and in use, the phenomenon of expanding with heat and contract with cold can make the adhesiveness of packing colloid and support die down, and the slit occurs, causes that steam infiltrates.In addition, the silicones structural arrangement is more loose, and moisture also is easy to infiltration.

China application number CN201020505895.1 discloses a kind of resistance wet type patch light-emitting diode, through encapsulating accent and pad and pin joint portion design waterproof groove to realize waterproof.China application number 201110078466.X discloses a kind of encapsulating structure and method for packing of SMD outdoor LED, is to realize waterproof at the joint portion of sheet metal and reflector design waterproof construction.The common ground of these two existing patent applications is on led support, to design waterproof construction, and the shortcoming that so exists is that the processing of led support will become, and cost numerous and diverse, led support significantly increases.

The utility model content

To the problem that water proofing property is poor, the waterproof construction cost is high that present paster LED exists, the utility model provides a kind of paster LED solution at LED surface-coated marine glue, makes LED have the excellent waterproof effect.

The utility model adopts following technical scheme to realize: a kind of paster LED of waterproof, and it comprises: circuit substrate; The support that comprises sheet metal and resin reflector, sheet metal comprise cathode metal sheet and negative pole sheet metal and are welded on the circuit substrate through scolding tin respectively, be filled with packaging plastic in the resin reflector; The LED wafer and the both positive and negative polarity of LED wafer that are fixedly installed at the bottom of the resin reflector cup are electrically connected with cathode metal sheet and negative pole sheet metal through lead respectively; Coating is arranged on the Waterproof glue line of the outer surface of support.

Wherein, the resin reflector is the PPA reflector.

Wherein, lead is gold thread, aluminum steel, copper cash or silver-colored line.

Compared with prior art, the utlity model has following beneficial effect:

The utility model at LED surface-coated Waterproof glue line, is realized the waterproof effect of LED after LED is welded in circuit substrate.The utility model is compared with existing waterproof paster LED, and technology simply is easy to realize, the cost of raw material is low, applied widely, good water-proof effect.

Description of drawings

Fig. 1 is the structural representation of the utility model waterproof paster LED.

Embodiment

As shown in Figure 1, the utility model proposes a kind of paster LED of waterproof, and this paster LED comprises: be thecircuit substrate 1 of PCB or MCPCB; Comprise the support ofsheet metal 3 andresin reflector 5, whereinsheet metal 3 is welded on thecircuit substrate 1 through scoldingtin 2, andsheet metal 3 comprises cathode metal sheet and the negative pole sheet metal with an interval; Be filled with packaging plastic (or fluorescent glue) 6 in the saidresin reflector 5; Be fixedly installed on theLED wafer 7 at the bottom of 5 glasss of the resin reflectors, and the both positive and negative polarity ofLED wafer 7 is respectively throughlead 8 cathode metal sheets and the electrical connection of negative pole sheet metal; Lateral surface coating at support is provided withWaterproof glue line 4.

In the present embodiment, saidresin reflector 5 can be PPA (polyphthalamide, English Polyphthalamide by name is called for short PPA) reflector.

In the present embodiment, saidlead 8 can be metal wires such as gold thread, aluminum steel, copper cash or silver-colored line.

Waterproof glue line 4 especially is coated insheet metal 3 and the contact position ofresin reflector 5 and the contact position ofpackaging plastic 6 and support; Mode through brushing, spraying or vapor deposition applies formationWaterproof glue line 4, realizes the water resistance of paster LED through the waterproof action ofWaterproof glue line 4.

Be welded in PCB or MCPCB circuit substrate at paster LED; Obtain after LED display module or the LED illuminating lamp semi-finished product; Choose can natural surface drying, viscosity is not more than one or more in the water white polyacrylic resin of 290cps, water white acrylic resin, water white epoxy resin, water white organic siliconresin, the water white polyurethane resin under the normal temperature; Apply 0.01mm～1mm thickness to the LED surface through brushing, spray or steaming the method for crossing; Emphasis coatedmetal lamina 3 and the contact position ofresin reflector 5 and the contact position ofpackaging plastic 6 and support, natural afterwards surface drying can obtain the good paster LED of water resistance.

Through facts have proved, the paster LED that the utility model proposes has favorable waterproof property.

The above is merely the preferred embodiment of the utility model; Not in order to restriction the utility model; Any modification of being done within all spirit and principles at the utility model, be equal to replacement and improvement etc., all should be included within the protection range of the utility model.

Claims (3)

1. the paster LED of a waterproof is characterized in that, said paster LED comprises: circuit substrate; The support that comprises sheet metal and resin reflector, sheet metal comprise cathode metal sheet and negative pole sheet metal and are welded on the circuit substrate through scolding tin respectively, be filled with packaging plastic in the resin reflector; The LED wafer and the both positive and negative polarity of LED wafer that are fixedly installed at the bottom of the resin reflector cup are electrically connected with cathode metal sheet and negative pole sheet metal through lead respectively; Coating is arranged on the Waterproof glue line of the outer surface of support.

2. according to the paster LED of the said a kind of waterproof of claim 1, it is characterized in that the resin reflector is the PPA reflector.

3. according to the paster LED of claim 1 or 2 said a kind of waterproof, it is characterized in that lead is gold thread, aluminum steel, copper cash or silver-colored line.

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