Appeal 2007-1243
Application 10/336,018
FINDINGS OF FACT
1. Hung teaches a color wheel with a balancing groove. Hung Abstract.
2. This groove is used to receive a balancing substance such as UV glue (glue
that is cured by UV light). Hung, col. 2, ll. 12-14.
3. Conventional to the art is balancing the color wheel by drilling holes or
adding adhesive materials at specific locations on the wheel. Adding adhesive has
the disadvantage of interfering to the mechanism or interfering with the optical
path. Drilling holes has the disadvantage of introducing metal powder which may
interfere with the bearings. Hung col. 1, ll. 10-16.
4. Hung’s patent is to solve the above mentioned problems with balancing a
color wheel by using a groove to contain the curable fluid. Hung col. 1, ll. 19-27.
5. Hung does not discuss the curable fluid flowing to counteract the out of
balance condition of the color while the color wheel is rotating. Further, one
skilled in the art would readily recognize that the methods of drilling holes or
adding adhesive can not be accomplished while the color wheel is rotating.
6. Appellant’s admitted prior art also discusses conventional approaches to
balancing a color wheel by drilling holes or adding adhesive materials at specific
locations on the ring. Specification 2.
7. Appellant’s admitted prior art states that the locations on the color wheel to
add or remove mass are determined by rotating the color wheel and monitoring the
imbalance by sensors such as accelerometers. During this type of test the system is
mounted on a suspended surface to avoid outside interference with the
measurements. Specification 1, 2.
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