Charged powder supply device

Abstract

A charged powder supply device is disclosed. A plurality of charged powder particles are disposed on an upper side of a carrier and at least an action source is positioned at a lower side of the carrier for acting on the carrier so as to vibrate the charged powder particles on the upper side of the carrier. As such, the vibrated charged powder particles are attached to objects to be coated, such as LEDs, under the effect of an electric field so as to form a powder layer, such as a phosphor layer. Since there are no other external forces that affect the moving direction of the charged powder particles, the powder layer can be uniformly formed on the objects.

What is claimed is: 
     
         1 . A charged powder supply device, comprising:
 a carrier having opposite first and second sides, wherein a plurality of charged powder particles are disposed on the first side of the carrier; and   at least an action source positioned at the second side of the carrier for acting on the carrier so as to vibrate the charged powder particles on the first side of the carrier, thereby causing the charged powder particles to leave the first side of the carrier.   
     
     
         2 . The device of  claim 1 , wherein the action source provides an impact force, a fluid motion, or an acoustic or ultrasonic wave. 
     
     
         3 . The device of  claim 1 , further comprising a receiving member positioned over and separated from the first side of the carrier for receiving the vibrated charged powder particles. 
     
     
         4 . The device of  claim 1 , wherein the action source is in contact with the second side of the carrier. 
     
     
         5 . The device of  claim 1 , wherein the action source is separated from the second side of the carrier. 
     
     
         6 . The device of  claim 1 , wherein a support member is disposed on the second side of the carrier. 
     
     
         7 . The device of  claim 6 , wherein the support member has a plurality of through holes corresponding in position to a plurality of action sources. 
     
     
         8 . The device of  claim 7 , wherein the action sources are disposed in the through holes, respectively. 
     
     
         9 . The device of  claim 1 , wherein the carrier further has: a plurality of through holes penetrating the first and second sides, and a carrying portion positioned on the first side of the carrier and covering one ends of the through holes, wherein the carrying portion is used for carrying the charged powder particles. 
     
     
         10 . The device of  claim 9 , wherein the action source acts on the carrying portion through the through holes of the carrier so as to vibrate the charged powder particles. 
     
     
         11 . The device of  claim 9 , further comprising a receiving member positioned over and separated from the first side of the carrier for receiving the vibrated charged powder particles. 
     
     
         12 . The device of  claim 11 , wherein the distance between the receiving member and the first side of the carrier is greater than the distance between any adjacent two of the through holes of the carrier. 
     
     
         13 . The device of  claim 1 , wherein the carrier has a plurality of uniformly distributed conductive traces or a planar conductor structure having uniformly distributed points formed by metal etching. 
     
     
         14 . The device of  claim 1 , further comprising power supplies disposed on the first side of the carrier. 
     
     
         15 . The device of  claim 14 , further comprising a receiving member positioned over and separated from the first side of the carrier for receiving the vibrated charged powder particles. 
     
     
         16 . The device of  claim 15 , wherein the power supplies are arranged in parallel or crossed to form a grid pattern with gaps in a manner that the distance between the receiving member and the power supplies is greater than the width of the gaps. 
     
     
         17 . The device of  claim 14 , wherein the carrier has a plurality of through holes penetrating the first and second sides, and the power supplies are arranged in parallel or crossed to form a grid pattern with gaps in a manner that the distance between any adjacent two of the through holes of the carrier and the width of the gaps are in a relationship of integer times. 
     
     
         18 . The device of  claim 1 , wherein the carrier is a power supply for generating an electric field and a corona discharge.