A scroll-type compressor includes a fixed and an orbiting scroll each having an end plate and a spiral element on the end plate and interfits with each other. A first transition line at a widened-starting portion of the spiral element between an interior wall and a tip surface comprises a first upper arc connecting to an upper, interior involute wall starting point and a second upper arc connecting to an upper, exterior involute wall starting point and a straight line. A second transition line at the widened-starting portion between the interior wall and a base surface comprises a first lower arc connecting to a lower, interior involute wall starting point and a second lower arc connecting a lower, exterior involute wall starting point and a straight line.
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