The present invention concerns itself with crystallographically doubly rotated quartz orientations vibrating in the transverse c-mode with turnover temperatures which are considerably less sensitive to angular misorientation than the comparable well known AT- or BT-cuts. These crystals are arbitrarily designated as AK-cut crystals and are defined by .phi.-angle variations between 30.degree.-60.degree. and .theta.-angle variations between 12.degree.-32.degree.. The turnover temperatures of these resonators are between 60.degree. C. and 200.degree. C. |
Citations|
| US3826931 | Feb 8, 1971 | 1974 | | DUAL CRYSTAL RESONATOR APPARATUS | | US4079280 | Jun 2, 1976 | Mar 14, 1978 | Hewlett-Packard Company | Quartz resonator cut to compensate for static and dynamic thermal transients | | US4124809 | Nov 14, 1974 | Nov 7, 1978 | Societe Suisse pour l'Industrie Horlogere Management Services S.A. | Quartz crystal resonator | | US4126802 | Jan 11, 1977 | Nov 21, 1978 | Centre Electronique Horloger, S.A. | Torsional mode CT or DT cut quartz resonator | | US4306170 | Aug 27, 1979 | Dec 15, 1981 | Kabushiki Kaisha Daini Seikosha | AT-Cut quartz resonator, with w/t=2.0 to 2.8, l/t<25 | | US4313071 | Sep 7, 1979 | Jan 26, 1982 | Centre Electronique Horloger S.A. | Piezo-electric quartz resonator |
Referenced by|
| US4542355 | Nov 7, 1984 | Sep 17, 1985 | The United States of America as represented by the Secretary of the Army | Normal coordinate monolithic crystal filter | | US4568850 | Feb 11, 1985 | Feb 4, 1986 | The United States of America as represented by the Secretary of the Army | Doubly rotated cylindrical crystal resonator | | US4670680 | Jul 29, 1986 | Jun 2, 1987 | R. F. Monolithics, Inc. | Doubly rotated orientations of cut angles for quartz crystal for novel surface acoustic wave devices | | US4670681 | Jul 29, 1986 | Jun 2, 1987 | R. F. Monolithics, Inc. | Singly rotated orientation of quartz crystals for novel surface acoustic wave devices | | US4705979 | Jun 26, 1985 | Nov 10, 1987 | Schlumberger Technology Corporation | Stress and temperature compensated surface acoustic wave devices | | US5304459 | Jun 19, 1992 | Apr 19, 1994 | Seiko Epson Corporation | At-cut crystal oscillating reed and method of etching the same | | US5314577 | Jun 19, 1992 | May 24, 1994 | Seiko Epson Corporation | At-cut crystal oscillating reed and method of etching the same | | US5334900 | Aug 23, 1993 | Aug 2, 1994 | Seiko Electronic Components Ltd. | Torsional quartz crystal resonator | | US5376861 | Mar 30, 1992 | Dec 27, 1994 | Seiko Epson Corporation | At-cut crystal oscillating reed and method of etching the same | | US6031315 | Jul 15, 1998 | Feb 29, 2000 | Sawtek Inc. | Optimal cut for saw devices on quartz | | US6172443 | Nov 24, 1998 | Jan 9, 2001 | CTS Corporation | Quartz crystal resonator with improved temperature performance and method therefor | | US6518778 | Jan 23, 2001 | Feb 11, 2003 | The United States of America as represented by the Secretary of the Army | Method of determining angle-of-cut | | US6590315 | May 26, 2000 | Jul 8, 2003 | | Surface mount quartz crystal resonators and methods for making same | | US6744182 | Jul 23, 2002 | Jun 1, 2004 | | Piezoelectric quartz plate and method of cutting same | | US7051728 | Apr 14, 2004 | May 30, 2006 | | Piezoelectric quartz plate and method of cutting same |
Claims1. A crystal resonator comprising a thin, quartz plate vibrating in a thickness shear c-mode resonance and (A) having a doubly rotated crystallographic orientation around (1) the z-axis of said plate by an angle phi (.phi.) ranging from about 30.degree. to 60.degree. and (2) the x-axis of said plate by an angle theta (.theta.) ranging from about 12.degree. to 31.92.degree.; and (B) said crystalline resonator further characterized by having turnover temperatures in the range of about 60.degree. C. to 200.degree. C. 2. A crystal resonator in accordance with claim 1 wherein the angle phi (.phi.) is in the range of about 30.degree. to 46.degree. and the angle theta (.theta.) is about 14.degree. to 30.degree.. 3. A crystal resonator in accordance with claim 2 wherein the angles (.phi.,.theta.) are about (30.0,24.44).degree.. 4. A crystal resonator in accordance with claim 2 wherein the angles (.phi.,.theta.) are about (36.58,28.45).degree.. 5. A crystal resonator in accordance with claim 2 wherein the angles (.phi.,.theta.) are about (46.10,23.59).degree.. 6. A crystal resonator in accordance with claim 2 wherein the angles (.phi.,.theta.) are about (40.9,21.0).degree.. 7. A crystal resonator in accordance with claim 2 wherein the angles (.phi.,.theta.) are about (40.9,23.59).degree.. 8. A crystal resonator in accordance with claim 2 wherein the angles (.phi.,.theta.) are about (40.9,27.0).degree.. 9. A crystal resonator in accordance with claim 2 wherein the angles (.phi.,.theta.) are about (36.0,24.44).degree.. |
