Abstract: Disclosed is a method of manufacturing a polyurethane filter foam having excellent air permeability, elasticity, and restoring force. In the method of manufacturing the polyurethane filter foam, the cell size of the filter foam is made regular by controlling the pressure by adjusting the diameter of the foaming head of a foaming machine, rather than adding a cell opener, cell irregularity caused by poor dispersion of the cell opener is alleviated, and air permeability, porosity, and compression set are excellent.

Abstract: Disclosed is a light emitting diode (LED). The LED includes a light emitting chip, a reflector formed with an annular groove in an inner surface thereof and surrounding the light emitting chip, and a lens engaged with the groove of the reflector. An inner diameter of a lens insertion portion of the groove is smaller than an outer diameter of the lens, so that the lens can be engaged with the groove through elastic deformation. Since the separately manufactured lens is engaged with and coupled into the groove of the reflector, the lens can be fixed through a simple process and aligned without an error. Since the lens is engaged with the groove of the reflector, the lens is prevented from being easily separated. In addition, since there is no need for the use of an adhesive, it is possible to prevent degradation of the reliability of the LED.

Abstract: Disclosed is a light emitting diode (LED). The LED includes a light emitting chip, a reflector formed with an annular groove in an inner surface thereof and surrounding the light emitting chip, and a lens engaged with the groove of the reflector. An inner diameter of a lens insertion portion of the groove is smaller than an outer diameter of the lens, so that the lens can be engaged with the groove through elastic deformation. Since the separately manufactured lens is engaged with and coupled into the groove of the reflector, the lens can be fixed through a simple process and aligned without an error. Since the lens is engaged with the groove of the reflector, the lens is prevented from being easily separated. In addition, since there is no need for the use of an adhesive, it is possible to prevent degradation of the reliability of the LED.