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Theory of Inventive Problem Solving (TRIZ) 327

Example 9.26. Restoring an Incandescent Filament For artificial lamp
lighting to more closely resemble sunlight, it is necessary to increase the
incandescent filament temperature. However, the higher the filament tem-
perature, the higher the metal evaporation rate. Thus the filament quickly
becomes thin and burns out.

Old design

Glass

Filament
New design

High temperature zone

It is proposed to restore an incandescent filament during the lamp’s oper-
ation by adding bromine into the lamp. Bromine interacts with the tungsten
settled on the bulb and forms tungsten bromide. The compound evaporates
and streams toward the high-temperature zone, where it decomposes and
settles in the same place from which it had evaporated.

Method 5:Trim or replace the object of a
harmful function
We can trim or replace the object of the harmful function by one of the
following ways in order to make the object not sensitive to harmful
action (field) (see Sec. 9.7):

■ Simplify the system so the object is eliminated (Sec. 9.7).
■ Replace the object by another part of the system.
■ Replace the object by another object.
■ Switch on/off the magnetic influence on the object.