Abstract: A lead frame includes a plurality of lead portions. At least a part of an upper surface of the lead portion and a sidewall surface of the lead portion is a rough surface having been subjected to roughening treatment. A value of a* in a CIELab color space of the rough surface is within a range from 12 to 19, and a value of b* is within a range from 12 to 17.

Abstract: In a selective diversity receiver with two antennas, the strength of the signal received by each antenna is measured at a present and a past time, the difference between the present strengths of the signals received by the two antennas is calculated, and the difference between the present and past strengths of the signal received by each antenna is calculated. If the difference between the present strengths of the two signals is not too large, the signal with the smaller past-to-present strength difference and accordingly with less fading is selected for further reception. In a portable electronic device, this antenna switching strategy reduces susceptibility to human body interference. The present and past strengths can be measured during the preambles of different packets to avoid switching antennas during data reception.

Abstract: A semiconductor device producing apparatus includes a first transporter which moves a substrate to a first unit to undergo at least a first process, and a second transporter, other than the first transporter, which moves the substrate to a second unit, to undergo at least a second process.

Abstract: A semiconductor device producing method includes the steps of (a) subjecting a substrate which is transported by first transport means to at least a first process within a first unit, and (b) subjecting the substrate which is subjected to the step (a) and is transported by second transport means other than the first transport means to at least a second process within a second unit.