Abstract:
PROBLEM TO BE SOLVED: To provide a method for manufacturing a crystal vibrator, capable of easily manufacturing the crystal vibrator in which one main surface of a vibrating portion has a curved convex portion, and reducing the manufacturing cost of the crystal vibrator. SOLUTION: The manufacturing method includes: a crystal substrate recess forming step of providing a plurality of crystal substrate recesses and substrate internal wirings on a crystal wafer; a cover forming step of providing a plurality of covers on the other main surface used as a crystal substrate of the crystal wafer by using an inkjet method; a convex processing step of processing the other main surface of the crystal wafer having the covers formed thereon; an electrode forming step of providing an electrode on a portion to be the crystal substrate; a first joining step of joining the first wafer having the portion to be a plurality of first containers to the crystal wafer with the crystal substrate recesses toward the first wafer; a second joining step of joining the second wafer having the plurality of container recesses provided on the one main surface to the crystal wafer with the container recesses toward the crystal wafer; and an individuating step of dividing the crystal wafer into individual crystal vibrators. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a method of manufacturing a composite piezoelectric board in which a piezoelectric board and an insulation board are attached through an adhesive material, wherein the warpage is small after heat processing even if an inexpensive insulation board is used, and variations of the warpage are small and stable. SOLUTION: The method of manufacturing a piezoelectric board includes at least: a first step of applying an adhesive material on the main surface of either of a piezoelectric board or an insulation board; a second step of attaching the piezoelectric board and the insulation board together through the adhesive material; a third step of controlling the temperature of the attached boards so as to be 25±5°C and radiating ultraviolet rays onto the adhesive material to cure it; a fourth step of grinding the attached boards to a desired thickness; and a fifth step of heating the ground attached boards to completely cure the adhesive material. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a tuning-fork type piezoelectric vibrating piece or piezoelectric device, wherein weight portions in the distal ends of vibrating arms do not collide with each other during vibration, even when the weight portions must be enlarged, while miniaturizing the tuning-fork type piezoelectric vibrating piece. SOLUTION: The tuning-fork type piezoelectric vibrating piece 20 is provided with a base portion 23 including a piezoelectric material; a pair of parallel vibrating arms 21, with a designated thickness D3 and a width W3 extending from the base portion; and a pair of weight portions 28, with the width of the vibrating arms 21 enlarged to have a fixed width W4 from the front of the tips of the vibrating arms 21 to the side of the tips. The pair of weight portions 28 have a skirt portion which has a thickness D4 smaller than the designated thickness D3. Accordingly, even if the vibrating arms vibrate, the weight portions will not collide. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a piezoelectric vibration piece that can improve bondability between the piezoelectric vibration piece and a package by suppressing deposition of ground metal made of chromium on a finished metal layer, a piezoelectric vibrator, a method of manufacturing the piezoelectric vibrator, oscillator, and electronic equipment and a radio wave clock. SOLUTION: The piezoelectric vibration piece 2 has, on a surface of a mounting region P, an electrode layer 18 formed by laminating the ground metal layer 18a made of chromium and the finished metal layer 18c made of gold. A barrier metal layer 18b for preventing the ground metal layer 18a from being diffused to the finished metal layer 18c is arranged between the ground metal layer 18a and the finished metal layer 18c in the mounting region P. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a method of manufacturing a piezoelectric vibrator which can improve bondability between a piezoelectric vibration piece and a package by keeping a surface of a finished metal layer in a good state and the piezoelectric vibrator manufactured by the manufacturing method, an oscillator having the piezoelectric vibrator, electronic equipment, and a radio wave clock. SOLUTION: The method of manufacturing the piezoelectric vibrator includes: a first etching process of processing a surface of the piezoelectric vibration piece 2 using a first etchant consisting of a potassium hydroxide aqueous solution prior to a process of mounting the piezoelectric vibration piece 2; and a second etching process of processing the surface of the piezoelectric vibration piece 2 using a second etchant consisting of a solution of potassium ferricyanide and potassium hydroxide. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a package for storing a piezoelectric element which is miniaturized and excellent in airtightness, and to provide a piezoelectric device, and a method for manufacturing the piezoelectric device. SOLUTION: The package includes a base body 101 for storing the piezoelectric element; an electrode 102 to which the piezoelectric element is connected; an outer connection terminal 103; a through-hole 104; and a conductor layer 105 formed on the inner surface of the through-hole. The base body 101 includes a recessed part 107 on the upper surface 106 to store the piezoelectric element. The electrode 102 is formed in the recessed part 107. The outer connection terminal 103 is formed on the lower surface 108 of the base body 101. The through-hole 104 is formed between the bottom surface 109 of the recessed part 107 in the base body 101 and the lower surface 108 of the base body 101. The conductor layer 105 electrically connects the electrode 102 to the outer connection terminal 103. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide a crystal oscillator element capable of dealing with miniaturization and cost reduction and having a highly accurate outer dimension, provide a manufacturing method thereof, and provide a surface mounted crystal device employing this crystal oscillator element. SOLUTION: The method of manufacturing the AT-cut crystal oscillator element in which a short side exposing a cleavage is arranged in parallel to a Z-axis and on the negative side of an X-axis, comprises an etching process for segmenting, and forming, on the large crystal preform, a crystal element board equivalent to the crystal oscillator element of a large crystal preform, coupling portions extending from each of corners of one of the short sides of the crystal preform, and a supporting portion connecting to an end edge of each of the connecting portions; and a dividing process of bending and breaking the crystal vibrating element at the smallest part of the coupling portion. COPYRIGHT: (C)2005,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To facilitate manufacturing a composite substrate which is used for an acoustic wave element and has a relatively simple structure while variation in size with temperature is smaller than that of a substrate formed only by laminating a piezoelectric substrate with a support substrate together. SOLUTION: A method includes preparing a silicon substrate 12, an LT substrate 10 capable of propagating SAW, and a resin film 18 in the same shape with the LT substrate 10. Then the LT substrate 10 is coated with an organic adhesive 13 and stuck on the silicon substrate 12, and the resin film 18 is put over the silicon substrate 12 and then heated to form a stuck substrate 16. Further, the top surface of the LT substrate 10 is polished by a polishing surface plate to polish the top surface into a mirror plane while reducing the thickness of the LT substrate 10. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a tuning-fork flexible crystal oscillator, capable of oscillating at a fundamental-wave mode in which harmonic-mode oscillation free of the influence of impacts and vibrations is suppressed, and to provide a crystal unit, a crystal-controlled oscillator, and electronic devices equipped with the crystal oscillator. SOLUTION: The tuning-fork flexible crystal oscillator is equipped with a tuning-fork base, and at least first and second tuning-fork arms connected to the tuning-fork base. One end in each of the first and second tuning-fork arms is connected to the tuning-fork base, and the other end is free; grooves are formed in each of the upper and lower sides of the tuning-fork arms, and electrodes are disposed on the upper sides of the grooves and the tuning-fork arms so as to oscillate in a reverse-phase flexible mode; and sizes of the tuning forks, grooves, and electrodes are determined so that the figure of merit M 1 in the fundamental-wave mode oscillation of the tuning-fork crystal oscillator is larger than the figure of merit M 2 in the secondary harmonic-mode oscillation. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a piezoelectric vibration device capable of obtaining stable characteristics by preventing an insulation defect while relaxing stress generated on a piezoelectric diaphragm. SOLUTION: A crystal vibrator 1 is comprised of a crystal diaphragm 2, a first cover member 3 and a second cover member 4 and in the crystal diaphragm 2, there are integrally molded a vibrating part 20 in which a pair of front and rear exciting electrodes 23 are formed, a frame part 29 formed thicker than the vibrating part, and a thin part 28 formed thinner than the vibrating part between the vibrating part and the frame part. In the vibrating part 20, a first bonding electrode 25 is formed and on one principal surface 31 of the first cover member 3, a second bonding electrode 33 is formed which is electrically coupled with an external connecting terminal 34 formed on another principal surface 37. Then, the first bonding electrode 25 and the second bonding electrode 33 are integrally bonded via brazing metal material, so that the exciting electrode 23 is electrically coupled with the external connecting terminal 34. COPYRIGHT: (C)2010,JPO&INPIT