The invention discloses a technological preparation method of a bent
LED lamp filament. The preparation method mainly comprises the following steps:
etching a circuit on a
metal substrate, using a
machine to punch or
cut a mosquito-repellent incense type vortex shaped structure, carrying out die bond,
adhesive deposite and packaging on the lamp filament on the
metal substrate, clamping two ends of the lamp filament with a fixture, and uniformly stretching the lamp filament outwards to manufacture the
LED lamp filament. Based on the preparation method, the invention further discloses a
bulb with the bent
LED lamp filament. Compared with the lamp filament made of traditional
ceramic, the lamp filament made of the
metal or
nonmetal substrate is higher in
thermal conductivity and power; die bond is carried out on the front side and the reverse side of the metal or
nonmetal substrate to enable
luminescence of the front side and the reverse side of the LED lamp filament to be more uniform; the vortex shape enables
luminescence of the lamp filament to be more three-dimensional and realizes low possibility of breakage of the lamp filament, and the yield of the bent LED lamp filament is higher; and the LED
bulb prepared through the preparation technology disclosed by the invention is more uniform in
luminescence, higher in wattage and longer in service life.