The present invention is related to a new structure of the stem of LED
Chip Unit
bulb, which comprises a cup disk, a
chip, a stand, a
molybdenum alloy wire and a stem. Essentially, the brace-end of the stem is connected to a supportive
chip cup disk. The center of the disk is concave so as to form a
holding chamber whose inner
diameter is open, arc-shaped and circular. The
molybdenum alloy wire is tapered off to a point and thus it takes a turn of 180°,
hooking and pressing against the
chip. Given the elastic coefficient of the barb-
turning angle, the tip of the
molybdenum alloy wire may point-press against the chip in a
normal state in response to the temperature-dependent expansion-contraction feature of the chip. The gradient of the arc-shaped, circular wall of the disk enables the chip to generate light that refracts at different angles, giving rise to a wide-angle, open, homogeneous
light source. The vacuum inside the
bulb facilitates efficient circulation and therefore heat absorption. As a result, despite the heat dissipation of the chip, the temperature of the
bulb does not increase, prolonging the life of the bulb. Hence, the new structure of the stem of LED chip unit bulb does have a practical utility.