Patent ID: 7635244

Claim:
A semiconductor wafer clean transfer device which automatically transfers a sheet-like electronic component accommodated in a cassette in clean air, comprising: a casing within which the cassette is opened; a fan/filter unit provided on a ceiling of the casing that blows clean air into the casing; a conveying robot provided in the casing that automatically transfers the semiconductor wafer between predetermined positions; a filter provided in the fan/filter unit that removes 99.999% or above of particulates of 0.1 μm or above; and a first floor provided in the casing and horizontally arranged on a lower side of an arm of the conveying robot at a middle height part of the conveying robot and through which air can pass between an upper side of the first floor and a lower side of the first floor, wherein the casing defines a first chamber between the first floor and the fan/filter unit, and a second chamber between the first floor and a bottom part of the casing through which air can pass between the second chamber and an outside of the bottom part of the casing, and the conveying robot comprises: a dust generation preventing seal structure provided to an articulated part of the arm; and a body which supports the arm and which has a vent hole arranged on a lower side of the first floor; a body cover disposed on a side surface of the body; and a base cover disposed at the base of the body; wherein a gap is formed on an inner side of a lower portion of the body cover between the body cover and the base cover so that air is upwardly taken in and from which air in the body is downwardly discharged to the second chamber upon a descending operation of the body.