. The Bell System technical journal . - : vX — j X. 73 — J oII O II 73 - ^ -^. 68 BELL SYSTEM TECHNICAL JOURNAL BC cuts. The 556 constant determines the coupHng between the face andthickness shear modes. As shown in Fig. this constant passes throughzero at two values, namely +31° and —59° and the resulting angles havebeen termed the AC and BC cuts. These angles are very close to the ATand BT cuts and hence they also possess the benefits of low coupling betweenmodes. In addition to making the cross coupling constants zero, a rotationof the crystal plate with respect to the crystallographic
. The Bell System technical journal . - : vX — j X. 73 — J oII O II 73 - ^ -^. 68 BELL SYSTEM TECHNICAL JOURNAL BC cuts. The 556 constant determines the coupHng between the face andthickness shear modes. As shown in Fig. this constant passes throughzero at two values, namely +31° and —59° and the resulting angles havebeen termed the AC and BC cuts. These angles are very close to the ATand BT cuts and hence they also possess the benefits of low coupling betweenmodes. In addition to making the cross coupling constants zero, a rotationof the crystal plate with respect to the crystallographic axes also results in achange in the ?.nd shear elastic constants. Notice that these passthrough maxima and minima at the zero values for the cross coupling con-stants. This of course affects the resonant frequencies of isolated as great as 50% increase in frequency constants may be obtainedby choosing the proper rotations. The equations relating the elastic con-stants as functions of orientation are given in appendix B for more com-plete use.
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