Jig for bonding voice diaphragm and piezoelectric plate

Abstract

The invention discloses a jig for bonding a voice diaphragm and a piezoelectric plate. The box comprises an upper box cover and a lower box cover, the lower box cover comprises a bottom plate and a side wall; a through hole is formed in the bottom plate; two arc-shaped baffle plates are arranged in the through hole; the diameter of the through hole is equal to that of the circular piezoelectric plate; the upper box cover is provided with a pressing plate, a stop plate and a central through hole, the pressing plate is provided with a guide column matched with the central through hole, the innerwall of the side wall is provided with an annular step, and after the voice diaphragm is placed in the lower box cover, the distance alpha between the annular step and the annular horizontal plane atthe bottom of the voice diaphragm is smaller than or equal to 0.2 mm. The jig has the beneficial effects that the traditional bonding mode of the voice diaphragm and the piezoelectric patch is changed, the parallelism error of the product is controlled within 0.2 mm, the disqualification phenomenon of the product is thoroughly eliminated, the percent of pass of the product reaches 100%, the wasteof raw materials is avoided, and the economic benefit is remarkably improved.

Description

technical field [0001] The application belongs to the field of sound-generating components, and in particular relates to a jig for bonding a sound film and a piezoelectric sheet. Background technique [0002] Sounding elements are installed in various existing piezoelectric alarms, sounders, piezoelectric ultrasonic devices, etc. Usually, the sounding element is composed of a sound film and a piezoelectric sheet assembly. Since the sound film is a soft The conical component of the piezoelectric ceramic sheet is a planar component. The combination of the two components is bonded with an adhesive. The traditional bonding method often causes the sound film to shift, skew, etc., so that the product is parallel Degree and concentricity can not meet the technical requirements, resulting in an increase in defective products, scrap rate, product qualification rate is only 70%, serious waste of raw materials, at the same time, its production efficiency is low, each person can only pr...

AI Technical Summary

Problems solved by technology

However, in the process of mass production, the output of sounding components is tens of thousands. Even if the product qualification rate reaches 99.5%, there will still be more substandard products, the waste of raw materials still exists, and the production cost has not yet been controlled to the ideal level.

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