Film stretching device and film stretching method for production of vibrating films of electret microphones

Abstract

The invention discloses a film stretching device and a film stretching method for production of vibrating film of electret microphones. The film stretching device comprises a squarely annular lower press ring, a squarely annular upper press ring, a vacuumizing device, a resonance frequency measuring device and a squarely annular film pickup frame. A squarely annular vacuum groove is arranged on the top of the lower press ring. The top of the lower press ring is divided into an internal top and an external top by the vacuum groove. The bottom of the vacuum groove is provided with an air suction hole. The upper press ring is arranged above the lower press ring, corresponds to the external top of the lower press ring and can be driven to move vertically by a first power device. The vacuumizing device used for vacuumizing the vacuum groove is connected with the air suction hole. The resonance frequency measuring device is used for measuring resonance frequency value of a film stretched tightly. The film pickup frame is used for picking up films stretched tightly and corresponds to an internal top of the upper press ring. By stretching the films by the film stretching device, the problem that vibrating films are non-uniform in tension during batch production of the vibrating films in the prior art is solved, and production efficiency and product uniformity are improved.

Description

technical field [0001] The invention relates to the technical field of production technology of an electret microphone diaphragm, in particular to a stretch film device and a stretch film method for producing an electret microphone diaphragm. Background technique [0002] An electret microphone is a device that converts sound signals into electrical signals. Sound is generated by the vibration of the air, propagates in the air, touches the medium, causes the medium to vibrate, converts it into other signals, and propagates again (such as eardrum, which converts sound into nerve signals to the brain). The medium in the microphone is the diaphragm, which vibrates and then converts the sound into an electrical signal through other components of the microphone and semiconductor devices. This involves the problem of the conversion quality of the sound. If the conversion ability of the medium is poor, the sound we hear will be far from the original. An important parameter that d...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is: provide a kind of stretch film device and stretch film method for producing the electret microphone diaphragm, solve the problem in the prior art that the diaphragm tension is inconsistent when producing the diaphragm in batches, improve production efficiency, Improve product consistency

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