Metal working – Method of mechanical manufacture – Electrical device making
Reexamination Certificate
2007-10-29
2009-10-06
Kim, Paul D (Department: 3729)
Metal working
Method of mechanical manufacture
Electrical device making
C029S025350, C029S609100, C029S831000, C029S834000, C029S835000, C216S013000, C216S080000, C216S097000, C310S319000, C310S370000, C331S158000, C331S176000
Reexamination Certificate
active
07596851
ABSTRACT:
The shape of a crotch portion of a tuning fork of a quartz piece is controlled such that main surfaces of two sheets of original plates, which are made of quartz crystal and the main surfaces thereof are orthogonal to the direction of the Z axis, which is a crystal axis, are bonded so that the plus/minus directions of the X axis, which is another crystal axis, are made in a reverse relation to each other to form a quartz substrate, and masks for forming the outer shape, through which the surfaces of the quartz substrate are exposed, are formed on both front and back surfaces of the quartz substrate in a manner that the mask follows along the outer shape of the quartz piece and the width direction of the outer shape agrees with the X axis, and the quartz substrate is etched to form the outer shape of the quartz piece.
REFERENCES:
patent: 4742260 (1988-05-01), Shimizu et al.
patent: 7167061 (2007-01-01), Matsudo et al.
patent: 2005/0085615 (2005-04-01), Wenning et al.
patent: 2005/0088250 (2005-04-01), Matsudo et al.
patent: 2002-188922 (2002-07-01), None
patent: 2004-015562 (2004-01-01), None
patent: 2005-098841 (2005-04-01), None
Jordan and Hamburg LLP
Kim Paul D
Nihon Dempa Kogyo Co. Ltd.
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