LIGHT-EMITTING DIODE INCORPORATING OPTICAL COMPONENT Russian patent published in 2005 - IPC

FIELD: semiconductor optoelectronics; various emitters built around light-emitting diodes.

SUBSTANCE: proposed light-emitting diode has chip covered with optical component made of translucent material whose outer surface is of aspherical shape obtained due to rotation of f(x) curve constructed considering optical properties of light-emitting chip and optical component material about symmetry axis of light-emitting diode; it is light-emitting surface. Curve f(x) in coordinate system whose origin point coincides with geometric center of light-emitting chip active area has initial point A₀ disposed on ordinate axis at distance corresponding to characteristic size of light-emitting diode; used as this size is desired height of optical component or its desired diameter; active area is formed by plurality of points A_i (i = 1, 2..., n). Taken as coordinates of each point are coordinates of intersection point of straight line coming from coordinate origin point at angle α_ini to ordinate axis and straight line coming from preceding point A_{i - 1} at angle G_i to abscissa axis drawn to point A_{i - 1}; α_ini is angle of propagation of i_in light beam pertaining to plurality of beams emitted by light emitting chip and chosen between angles 0 and 90 deg.; angle G_i is found from given dependence.

EFFECT: ability of shaping desired light-beam emission directivity pattern.

1 cl, 3 dwg