| 摘要 |
PURPOSE:To simplify the assembling work and to reduce the irregularity in minimum light trigger power of the titled semiconductor device by a method wherein, in the semiconductor device which performs a diaphragm action on the light made to irradiate on a light-receiving surface, the diameter of light emitting end of the internal light guide is made larger than the diameter of the light-receiving surface. CONSTITUTION:The outlet diameter b1 of an internal light guide 11 is formed larger than the diameter (a) of an element light-receiving surface 5. Among the lights emitted from the light emitting end face of the light guide 11, the light emitted from the part directly above the light receiving surface 5 is made incident on the light receiving surface 5, and it is turned to the light which is effective to a trigger. On the other part, the light is made to irradiate on the outside part of the light receiving surface and it gives no effect on the trigger. Accordingly, if the distance (d) is 0<d<(b1-a)/2, the light which came out from the guide 11 is made to irradiate on the entire light receiving surface uniformly. This means that the minimum light trigger power is always maintained constant within the error range of (b1-a)/2 when a trigger thyristor is assembled. As a result, the assembling work of a light trigger thyristor is simplified, and the irregularity of the minimum light trigger power can be reduced. |
