Patent ID: 6120178
Filing Date: 2000-09-19
Classification: G04G

Abstract:
A method for adjusting the rate of a horological module, said horological module including a printed circuit on which are mounted in particular a quartz and an integrated circuit including:an oscillator driven by said quartz,a frequency divider circuit,an adjustment circuit allowing a correction factor of the rate of said horological module to be introduced into said frequency divider circuit, anda memory circuit containing data representing said correction factor, this method including the following steps:a) measuring the rate of said horological module;b) calculating said correction factor of the rate of said horological module; andc) storing said data representing said correction factor in said memory circuit,wherein the memory circuit includes memory elements formed of fuses which can be destroyed by laser and wherein said integrated circuit is mounted beforehand, prior to measuring step a), on said printed circuit without application of any protective resin, storage step c) including the following steps:c1) aligning the module under a laser device;c2) destroying, by means of said laser device, said fuses necessary for coding said data representing the correction factor of the rate of the horological module;this storage step c) being further followed by the following step:d) depositing said protective resin over said integrated circuit.