Magnetism driven telescopic driver

Abstract

The invention discloses a manetostrictor driver, comprising a shell body, a manetostrictor rod, a coil brace and a drive coil; wherein, a transmission rod is arranged along the stretching direction of the manetostrictor rod, one end of the transmission rod contacts with the manetostrictor rod, and the other end contacts with a follower extending out of the shell body; a flexible component is arranged between the transmission rod and the shell body; part or all of the coil brace which is made of magnetic material offers bias magnetic field to the manetostrictor rod. The invention combines a permanent magnet providing the bias magnetic field and the coil brace into a whole, the structure is compacter, and the volume of the driver is diminished, thereby being beneficial to heat output; in addition, the manetostrictor rod is driven by adopting the most simplified way of magnetic drive, thereby reducing the magnetic drag of a magnetic circuit to ensure that the stretching transformation of the manetostrictor rod is more delicate, the voice has no hysteresis quality, and the fidelity is high. In addition, because the direct output is adopted, the problems of phase change and distortion can be reduced, and the structure is further simplified and optimized.

Description

technical field [0001] The invention belongs to the field of multistage energy conversion and audio technology, and relates to a device for converting electric energy into sound energy, in particular to a magnetostrictive driver. Background technique [0002] At present, most of the existing loudspeakers are realized in the form of electromagnetic energy conversion. The main working principle is to use the voice coil to drive the vibrating basin to do mechanical movement to radiate sound outward. Because of its structure and vibration mode, it must have problems that cannot be completely solved. Sound deficiencies, such as phase distortion, directivity, sharp sound, voice coil vibration lag, poor fidelity, low sensitivity and other shortcomings. In addition, there is another NXT flat-panel drive technology, which uses an electromagnetic driver combined with a special honeycomb flat panel to reproduce sound in the form of bending vibration on the flat surface, because it stil...

AI Technical Summary

Problems solved by technology

[0002] At present, most of the existing loudspeakers are realized in the form of electromagnetic energy conversion. The main working principle is to use the voice coil to drive the vibrating basin to do mechanical movement to radiate sound outward. Because of its structure and vibration mode, it must have problems that cannot be completely solved. Sound deficiencies, such as phase distortion, directivity, sharp sound, voice coil vibration lag, poor fidelity, low sensitivity, etc.

In addition, there is another NXT flat-panel drive technology, which uses an electromagnetic driver combined with a special honeycomb flat panel to reproduce sound in the form of bending vibration on the flat surface, because it still uses a general-purpose electromagnetic conversion structure (moving coil type) Do audio signal conversion form, so there are still disadvantages of traditional speakers

[0003] Chinese patent CN1053091A discloses a method for vibrating parts and the equipment used therein. This kind of vibration can achieve low vibration frequency, poor stability, poor synchronization of a group of exciters running in parallel, and it is difficult to realize automatic control; the sonar system is now The seismic source used is to use the transduction principle of piezoelectric ceramics to convert electrical signals into vibrations. The energy density of this seismic source is low, which makes the volume of the seismic source large and inconvenient to use. Moreover, the sound wave propagation distance is limited and the resolution is low.

For the loudspeaker with the above structure, the bias magnetic field of the magnetostrictive material is provided by the permanent magnets at both ends, and the driving coil is directly wound around the magnetostrictive material and the permanent magnet periphery, and the heat dissipation effect of such a structure is poor; in addition, the magnetic The expansion and contraction of the stretching material is conducted through the amplifier with complex structure, rather than direct output, which occupies a large space, has high reluctance of the magnetic circuit, and has problems of phase lag, poor sensitivity and sound quality distortion

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