Loadspeaker with internal DC motor

Abstract

Disclosed is a speaker with a built-in direct current motor for selectively generating sound and vibration, which includes: a speaker part, a direct current motor part, and a frame. The speaker part has a yoke having a hole formed at the center thereof, a first ring-shaped magnet mounted on the top surface of the peripheral portion of the yoke, a ring-shaped upper plate mounted on the top surface of the first magnet, a vibration plate fixedly mounted to the top surface of the upper plate at the circumferential end thereof, and a generally cylindrical voice coil attached to the bottom surface of the vibration plate. The direct current motor part has a lower plate coupled to the bottom surface of the peripheral portion of the yoke, a flexible printed circuit board disposed on the lower plate, a second ring-shaped magnet mounted on the top surface of the lower plate, a rotary shaft positioned one end thereof on the hole of the yoke and positioned the other end thereof on the hole of the center of the flexible printed circuit board, and an eccentric rotor rotatably mounted on the rotary shaft.

Description

technical field [0001] The present invention relates to a loudspeaker with a built-in direct current (DC) motor, and in particular, to such a speaker with a built-in DC motor, which is configured in a portable device such as a mobile phone for generating vibrations to select output sound and / or vibration selectively. Background technique [0002] figure 1 is a partial sectional view of a mobile phone with a conventionally used micro speaker and a coin-type vibration motor embedded in the speaker. [0003] Recently, consumers desire to purchase mobile phones having the function of generating at least 16 polyphonic or 40 polyphonic ring tones and displaying colors. This requires the use of micro-speakers with outer diameters in the range of φ17 or above. However, since a micro speaker and a vibration motor used in a conventional mobile phone are manufactured separately, they need to be separately provided inside the mobile phone. Such as figure 1 As shown, the mobile phon...

AI Technical Summary

Problems solved by technology

[0010] However, the above-mentioned vibration speaker has the following problems: First, it is necessary to apply a low-frequency alternating current corresponding to the resonant frequency of the first and second elastic support members 14 and 17 to the vibration speaker; secondly, the first and second elastic support members 14 The modulus of elasticity of and 17 will change after a long time, so the frequency of the applied alternating current should also be appropriately changed

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