Page 319 - Design for Six Sigma a Roadmap for Product Development

Theory of Inventive Problem Solving (TRIZ) 289

SS Height adjustment
4
(Angle adjusted mirror)
SS Focusing device
3
(Rack and pinion)

SS Magnifying lens
2

SS Projection lamp
1
SS Cooling Fan
5

SS Power supply
6
regulator
Figure 9.2 Overhead projector.

M
Hand Focusing adjuster
M
M
Angular adjuster
M
Heat
E Light Light
Electrical E Projection Lens Film Focused
power lamp Heat Image Mirror image Screen
Heat
E Cold Cold
Cold
air air
air
Fan
Figure 9.3 Functional analysis diagram for an overhead projector, where E stands for
electrical field, and M stands for mechanical field.

3. From “hand” to “angular adjustment” to “mirror,” that is, the func-
tion of “to project image to right position in screen,” which is also a
secondary basic function.
4. From “electricity” to “projection lamp” to “lens,” and so on, which is
a harmful function chain, without correction, that harmful function
will damage the film and the device.