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 light-emitting chip covered by optical component made of translucent material whose outer surface is aspherical in shape due to rotation of curve f(x) built considering optical properties of light-emitting chip and optical component material about symmetry axis of light-emitting diode. This surface emits light and f(x) curve in coordinate system whose origin coincides with geometric center of active area of light-emitting diode has initial point A₀ disposed on ordinate axis at distance corresponding to characteristic size of light-emitting diode which is, essentially, optical component height or its desired diameter, and is formed by plurality of points A, (i = 1, 2... n); coordinates of intersection point of straight line drawn from coordinate origin point at angle α_ini to ordinate axis drawn from preceding point A_{i - 1} at angle G_i to abscissa axis drawn to point A_{i - 1} are taken as coordinates of each of them;; α_ini is angle of propagation of i_in light beam pertaining to plurality of beams emitted by light-emitting chip chosen between 0 and 90 deg. Angle G_i is found from given dependence. Angle α_outi is found by pre-construction of directivity pattern DP_in of beam emitted by light-emitting chip. Coordinates of A points are checked by means of light-emitting diode simulator that has optical component whose outline is formed by plurality of A_i points as well as light-emitting chip whose beam directivity pattern is DP_in; this chip is used as distributed light source having three-dimensional emitting area whose size and appearance correspond to those of emitting area used in light-emitting diode of light-emitting chip. Light emitting points in light-emitting chip of simulator under discussion are offset relative to origin of coordinates within its emitting area; coordinates of A_i points are checked by comparing directivity pattern DP_out and directivity pattern DP_sim of beam emitted by light-emitting diode simulator, both displayed in same coordinate system. When these directivity patterns coincide, coordinates of points A_i function as coordinates of points forming curve f(x); if otherwise, coordinates of points A_i are found again, and DP_outj is given as directivity pattern DP_out whose points are disposed above or below the latter, respectively, depending on disposition of directivity pattern DP_sim below or above directivity pattern DP_out in the course of check.

EFFECT: ability of proposed light-emitting diode to shape desired directivity pattern of light beam.

1 cl, 3 dwg