Piezoelectric vibrator manufacturing method, piezoelectric vibrator, oscillator, electronic device, and radio-controlled timepiece

摘要

A method for manufacturing a piezoelectric vibrator is provided. The piezoelectric vibrator includes: a package in which a first substrate and a second substrate are superimposed so as to form a cavity therebetween; extraction electrodes which are formed on the first substrate so as to be extracted from the inner side of the cavity to an outer edge of the first substrate; a piezoelectric vibrating reed which is sealed in the cavity and electrically connected to the extraction electrodes at an inner side of the cavity; and outer electrodes which are formed on an outer surface of the package so as to be electrically connected to the extraction electrodes at the outer side of the cavity. The method includes: a bonding film forming step of forming a bonding film on at least one of the first substrate and the second substrate using a low-melting-point glass so as to bond the two substrates; a mounting step of electrically connecting the piezoelectric vibrating reed to the extraction electrodes formed on the first substrate; and a bonding step of superimposing the first substrate and the second substrate onto each other with the bonding film disposed therebetween while heating the bonding film to a predetermined bonding temperature to thereby bond the two substrates by the bonding film.