Requirements for Unity of Application - Japan Patent Office

[Example 41]
[Title of the Invention]
Piezoelectric monocrystal and the surface acoustic wave element utilizing the piezoelectric
monocrystal
[Claims]
1. A Piezoelectric monocrystal comprising the structure expressible by the general formula
(Ba2-xSrx) TiSi2O8, where the value of X is 0.25≦X≦1.2.
2. Surface acoustic wave element, characterized by using the surface waves that
propagates parallel to the vertical surface of the Z-axis of piezoelectric monocrystal, that
propagates in parallel to the X-axis surface of piezoelectric monocrystal or that propagates
the surface that includes X-axis and also forms the angleμwhere |μ|< 30 o in which the
surface is parallel to the X-axis of piezoelectric monocrystal of the piezoelectric
monocrystal having the structure expressible by the general formula (Ba2-xSrx) TiSi2O8,
where the value of X is 0.25≦X≦1.2.
[Excerpt from Detail Description of the Invention and Drawings]
This invention concerns the piezoelectric monocrystal and the surface acoustic wave
element used in ultrasound oscillator element.
The piezoelectric monocrystal in this invention has a large coefficient of coupling and the
coefficient of temperature in delay time is very low so that it is particularly suitable for use as
the material in surface acoustic wave device.
This surface acoustic wave element using piezoelectric monocrystal in this invention is (1)
that propagates on the
k ρ vertical surface that is vertical to the Z-axis of the piezoelectric
monocrystal (Figure 2 is the propagating direction of the acoustic wave,μis the Eulerian
angle of the angle vertical to the cut surface and the Z-axis, θis the Eulerain angle of the
propagation of the surface waves and the X-axis), (ii) the direction of the surface wave
propagation in parallel to the surface that includes the X-axis (Figure 3), (3) the surface wave
propagating in the vertical direction of the cut surface that includes the X-axis and the cut
surface that is in the vertical direction, and the Z-axis of the monocrystal together comprises
the angleμwhere |μ|< 30 o .
Figure 1 Figure 2 Figure 3
[Explanation]
The technical fields of the specified invention (Claim 1) and related invention (Claim 2) are
in “piezoelectric monocrystal” and “surface acoustic wave element,” respectively. It is quite
appropriate to include piezoelectric monocrystal in the surface wave acoustic element. The
technical fields of both are directly and technically related and the industrial fields of application
of both inventions are the same.
The piezoelectric monocrystal that is the new matter corresponding to the problem to be
solved of the specified invention (Claim 1) is substantial part of matters in the claim of the
related invention (Claim 2). Therefore the substantial parts of matters in the claims of the
inventions are the same.
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