# US 11,121,697 B2 · Quartz crystal resonator and quartz crystal resonator unit > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,121,697 B2 - Document ID: US11121697B2 - Status: Granted - Kind: B2 - Application number: 15/856,414 - Filed: 2017-12-28 - Published: 2018-05-03 - Granted: 2021-09-14 - Earliest claimed: 2015-07-09 - Assignees: Murata Manufacturing Co., Ltd. - Applicants: Murata Manufacturing Co., Ltd. - Inventors: Ryuichi Kawai; Hiroyuki Yamamoto; Hiroaki Kaida - Web page: https://patentgrep.com/patent/US11121697B2 ## CPC - H03H 9/19: consisting of quartz - H03H 3/02: for the manufacture of piezoelectric or electrostrictive resonators or networks (H03H3/08 takes precedence) - H03H 9/02023: {consisting of quartz} - H03H 9/02157: {Dimensional parameters, e.g. ratio between two dimension parameters, length, width or thickness} - H03H 9/0552: {the device and the other elements being mounted on opposite sides of a common substrate} - H03H 9/10: Mounting in enclosures {(constructional combinations of enclosure with electromechanical and other electronic elements H03H9/0538)} - H03H 9/1021: {the BAW device being of the cantilever type} - H03H 9/13: for networks consisting of piezoelectric or electrostrictive materials (for networks using surface acoustic waves H03H9/145) - H03H: IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS (waveguides, resonators, lines or other devices of the waveguide type H01P) ## Abstract A quartz crystal resonator that includes an AT-cut quartz crystal blank that is plate-shaped and that is rectangular when viewed in a direction normal to a main surface thereof; and a first outer electrode and a second outer electrode disposed on the main surface and arranged in a short-side direction of the main surface. Long sides of the main surface are substantially parallel to a Z′ axis of the quartz crystal blank. The short sides of the main surface are substantially parallel to an X axis of the quartz crystal blank. A frequency of a main vibration of the quartz crystal blank is in a range of 20.0 MHz to 60.0 MHz, and 0.050≤P≤−0.0047×F+1.728, where P (mm) is a distance between the first outer electrode and the second outer electrode in the short-side direction, and F (MHz) is the frequency of the main vibration. ## Claims ### Claim 1 A quartz crystal resonator unit comprising: a quartz crystal resonator that includes: an AT-cut quartz crystal blank that is plate-shaped and that is rectangular when viewed in a direction normal to a first main surface thereof; and a first outer electrode and a second outer electrode disposed on the first main surface of the AT-cut quartz crystal blank and arranged in a short-side direction in which short sides of the first main surface of the AT-cut quartz crystal blank extend; a plate-shaped substrate body having a second main surface; and a third outer electrode and a fourth outer electrode disposed on the second main surface of the substrate body, wherein the first outer electrode and the third outer electrode are fixed to each other via a first electroconductive adhesive, and the second outer electrode and the fourth outer electrode are fixed to each other via a second electroconductive adhesive, wherein long sides of the main surface of the AT-cut quartz crystal blank are substantially parallel to a Z′ axis of the AT-cut quartz crystal blank, wherein the short sides of the main surface of the AT-cut quartz crystal blank are substantially parallel to an X axis of the AT-cut quartz crystal blank, wherein a frequency of a main vibration of the AT-cut quartz crystal blank is in a range of 20.0 MHz to 60.0 MHz, and wherein 0.050≤P≤−0.0047×F+1.728, where P (mm) is a minimum distance between a first portion where the first electroconductive adhesive is in contact with the quartz crystal resonator and a second portion where the second electroconductive adhesive is in contact with the quartz crystal resonator in the short-side direction, and F (MHz) is the frequency of the main vibration of the AT-cut quartz crystal blank. ### Claim 2 (depends on 1) The quartz crystal resonator unit according to claim 1, wherein the frequency of the main vibration of the AT-cut quartz crystal blank is 37.4 MHz, and 0.370≤P≤0.683. ### Claim 3 (depends on 2) The quartz crystal resonator unit according to claim 2, wherein a length of each of the long sides of the first main surface is 2.0 mm or smaller. ### Claim 4 (depends on 3) The quartz crystal resonator unit according to claim 3, wherein the first outer electrode is in contact with a first end of one of the short sides of the first main surface of the AT-cut quartz crystal blank, and wherein the second outer electrode is in contact with a second end of the one of the short sides of the main surface of the AT-cut quartz crystal blank. ### Claim 5 (depends on 1) The quartz crystal resonator unit according to claim 1, wherein a length of each of the long sides of the first main surface is 2.0 mm or smaller. ### Claim 6 (depends on 5) The quartz crystal resonator unit according to claim 5, wherein the first outer electrode is in contact with a first end of one of the short sides of the first main surface of the AT-cut quartz crystal blank, and wherein the second outer electrode is in contact with a second end of the one of the short sides of the main surface of the AT-cut quartz crystal blank. ### Claim 7 (depends on 1) The quartz crystal resonator unit according to claim 1, wherein a material of the substrate body is a ceramic. ### Claim 8 (depends on 1) The quartz crystal resonator unit according to claim 1, further comprising: a cap that disposed on the substrate body and covering the quartz crystal resonator. ### Claim 9 (depends on 1) The quartz crystal resonator unit according to claim 1, where a thickness of the AT-cut quartz crystal blank is in a range of 0.0278 mm to 0.0835 mm. ### Claim 10 A quartz crystal resonator comprising: an AT-cut quartz crystal blank that is plate-shaped and that is rectangular when viewed in a direction normal to a main surface thereof; and a first outer electrode and a second outer electrode disposed on the main surface and arranged in a short-side direction in which short sides of the main surface extend, wherein long sides of the main surface are substantially parallel to a Z′ axis of the quartz crystal blank, wherein the short sides of the main surface are substantially parallel to an X axis of the quartz crystal blank, wherein a frequency of a main vibration of the quartz crystal blank is in a range of 20.0 MHz to 60.0 MHz, and wherein 0.050≤P≤−0.0047×F+1.728, where P (mm) is a distance between the first outer electrode and the second outer electrode in the short-side direction, and F (MHz) is the frequency of the main vibration of the quartz crystal blank. ### Claim 11 (depends on 10) The quartz crystal resonator unit according to claim 10, wherein the frequency of the main vibration of the AT-cut quartz crystal blank is 37.4 MHz, and 0.370≤P≤0.683. ### Claim 12 (depends on 11) The quartz crystal resonator unit according to claim 11, wherein a length of each of the long sides of the first main surface is 2.0 mm or smaller. ### Claim 13 (depends on 12) The quartz crystal resonator unit according to claim 12, wherein the first outer electrode is in contact with a first end of one of the short sides of the first main surface of the AT-cut quartz crystal blank, and wherein the second outer electrode is in contact with a second end of the one of the short sides of the main surface of the AT-cut quartz crystal blank. ### Claim 14 (depends on 10) The quartz crystal resonator unit according to claim 10, wherein a length of each of the long sides of the first main surface is 2.0 mm or smaller. ### Claim 15 (depends on 14) The quartz crystal resonator unit according to claim 14, wherein the first outer electrode is in contact with a first end of one of the short sides of the first main surface of the AT-cut quartz crystal blank, and wherein the second outer electrode is in contact with a second end of the one of the short sides of the main surface of the AT-cut quartz crystal blank. ### Claim 16 (depends on 10) The quartz crystal resonator unit according to claim 10, where a thickness of the AT-cut quartz crystal blank is in a range of 0.0278 mm to 0.0835 mm.