Page 351 - Design for Six Sigma a Roadmap for Product Development

Theory of Inventive Problem Solving (TRIZ) 321

Wire
Current
Coating

Example 9.19 Change the Space Structure of the Field
Old design

Infrared lamp
Spiral (1)
1
Infrared
beams
2
Semiconductor
wafer (2)
Semiconductor wafer

An infrared lamp heats a semiconductor wafer. (Disadvantage: The wafer
heats unevenly; the edges cool down faster than the center portion.)
New design

Infrared lamp Spiral with
uniform pitch (1)
1
Infrared
beams
2
Semiconductor
wafer (2)
Semiconductor wafer

It is proposed to make the lamp heat uniformly. The lamp spiral heating ele-
ment is made with a smaller winding pitch near the outer edges. This lamp
produces an uneven heat flow which compensates for nonuniform cooling in
the wafer.

9.6.2 Methods to eliminate or contain
harmful functions
When a harmful function is delivered, we have:

F
Subject Object