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EP-4243442-B1 - SPEAKER

EP4243442B1EP 4243442 B1EP4243442 B1EP 4243442B1EP-4243442-B1

Inventors

  • WANG, XIAO-QIN
  • PAN, LI-PING

Dates

Publication Date
20260506
Application Date
20220905

Claims (8)

  1. A speaker (100), comprising: a frame (10); a vibration assembly (30) assembled on the frame (10); and a magnetic circuit assembly (50) assembled on the frame (10); wherein the vibration assembly (30) comprises a voice coil (34) and a piezoelectric element (33), the voice coil (34) and the piezoelectric element (33) are arranged coaxially, and the voice coil (34) is between the piezoelectric element (33) and the magnetic circuit assembly (50); characterized in that the piezoelectric element (33) is cone-shaped, and a top of the cone-shaped piezoelectric element (33) is away from the magnetic circuit assembly (50).
  2. The speaker (100) according to claim 1, wherein the vibration assembly (30) further comprises a flange (31) and a pot portion (32), the pot portion (32) is cone-shaped, and the pot portion (32) comprises a first ring edge (321) and a second ring edge (322) opposite to the first ring edge (321); a diameter of the first ring edge (321) is greater than a diameter of the second ring edge (322); the first ring edge (321) is connected to the flange (31), and the piezoelectric element (33) is assembled on the second ring edge (322).
  3. The speaker (100) according to claim 2, wherein the voice coil (34) is connected to the pot portion (32).
  4. The speaker (100) according to any of claims 1-3, wherein the vibration assembly (30) further comprises a damper (35), the damper (35) comprises a third ring edge (351) and a fourth ring edge (352) opposite to the third ring edge (351); a diameter of the third ring edge (351) is greater than a diameter of the fourth ring edge (352); the third ring edge (351) is connected to the frame (10), and the fourth ring edge (352) is connected to the voice coil (34).
  5. The speaker (100) according to any of claims 2-4, wherein the flange (31) comprises a raised portion (313), an outer ring (311) and an inner ring (312) opposite to the outer ring (311), the outer ring (311) is connected to the frame (10), and the inner ring (312) is connected to the pot portion (32); the raised portion (313) is between the outer ring (311) and the inner ring (312).
  6. The speaker (100) according to any of claims 1-5, further comprising a first conductive board (60) and a second conductive board (70), wherein the frame (10) surrounds the vibration assembly (30) to form a tubular wall (11), and the tubular wall (11) comprises a first installation portion (12) and a second installation portion (13); the first conductive board (60) is assembled on the first installation portion (12), and the second conductive board (70) is assembled on the second installation portion (13); the first conductive board (60) is electrically connected to the piezoelectric element (33), and the second conductive board (70) is electrically connected to the voice coil (34).
  7. The speaker (100) according to any of claims 1-6, wherein the piezoelectric element (33) comprises a support sheet and a piezoelectric material, and the piezoelectric material is attached to the support sheet.
  8. The speaker (100) according to any of claims 1-7, wherein the magnetic circuit assembly (50) further comprises a channel bar (51), a washer (54), a negative magnet (55), and a main magnet (52), and the main magnet (52) and the washer (54) are assembled on the channel bar (51); the negative magnet (55) is assembled on the main magnet (52) through the washer (54); a gap (53) is between the main magnet (52), the washer (54), and the channel bar (51), and at least one portion of the voice coil (34) is received in the gap (53).

Description

BACKGROUND Technical Field The present disclosure relates to a speaker, in particular to a speaker having a piezoelectric element. Related Art In general, the speaker known to the inventor has a single voice coil. The single voice coil speaker does not perform well in high-frequency sound quality. In order to solve the problem of poor performance of high-frequency sound quality of the speaker, a tweeter is generally provided on the speaker to enhance the high frequency performance. However, the additionally provided tweeter increases the size and components of the speaker, resulting in extra costs. US5,295,194A describes a multi-driver, coaxially mounted loudspeaker array utilizing a high frequency bi-morph driving element (tweeter) that is preferably contained within the air-core of the voice coil former of a lower frequency loudspeaker (woofer). The outwardly extending conical edge of the high frequency device's diaphragm is annularly fixed by a compliance to the inner surface of the referenced voice coil former or to the woofer diaphragm which extends outwardly therefrom. Alternately, the bi-morph element is attached to other dynamic parts of the woofer such as the dust cap or at the rim of, or otherwise on, an extension of the former. In this mode, the bi-morph element may first be mounted to a section of a cylinder or cone which acts as a frame of the same circumference or more/less than that of the coil former. Thereafter, the frame is mounted to the end of, over or inside the coil former, or any moving part of the woofer. JPS6027300A describes a ceramic particle and the polymer material are mixed and are bound and are formed into a domic shape, thus obtaining the polymer compound piezoelectric material. Electrodes 1a and 1b are provided on upper and lower faces to form a piezoelectric oscillator 1. The peripheral part 1a of this domic piezoelectric oscillator 1 is adhered to the center of the bottom of a diaphragm 12, which is formed into a conical shape, to attach the piezoelectric oscillator 1 to the diaphragm 12. In this case, the audio signal from an audio signal source 15 is applied to a voice coil 9 and the piezoelectric oscillator 1, and a low or middle sound band is reproduced by the diaphragm 12, and the piezoelectric oscillator 1 functions as a diaphragm for high sound and is used as a dustproof cap also. US2,593,031A describes a loud speaker, a piezoelectric element including two fiat titanate ceramic members secured together face to face and having a common electrode therebetween and each having an outer uncommon electrode, means for supporting the element at its extremities, a speaker cone supported at its extremities, a driving rod secured to the element intermediate its ends and having driving relation with the apex of the speaker cone, signal leads secured to the uncommon electrodes for direct coupling to an amplier, and a signal lead secured to the common electrode for connection to ground to maintain the uncommon electrodes positive with respect to the common electrode. SUMMARY The invention is set out in the appended set of claims. In view of this, according to one embodiment, a speaker is provided and comprises a frame, a vibration assembly, and a magnetic circuit assembly. The vibration assembly is assembled on the frame. The magnetic circuit assembly is assembled on the frame. The vibration assembly comprises a voice coil and a piezoelectric element. The voice coil and the piezoelectric element are arranged coaxially, and the voice coil is between the piezoelectric element and the magnetic circuit assembly. In some embodiments, the vibration assembly further comprises a flange and a pot portion, the pot portion is cone-shaped, and the pot portion comprises a first ring edge and a second ring edge opposite to the first ring edge. A diameter of the first ring edge is greater than a diameter of the second ring edge. The first ring edge is connected to the flange, and the piezoelectric element is assembled on the second ring edge. The piezoelectric element is cone-shaped, and a top of the cone-shaped piezoelectric element is away from the magnetic circuit assembly. In some embodiments, the voice coil is connected to the pot portion. In some embodiments, the vibration assembly further comprises a damper, the damper comprises a third ring edge and a fourth ring edge opposite to the third ring edge. A diameter of the third ring edge is greater than a diameter of the fourth ring edge. The third ring edge is connected to the frame, and the fourth ring edge is connected to the voice coil. In some embodiments, the flange comprises an outer ring and an inner ring opposite to the outer ring, the outer ring is connected to the frame, and the inner ring is connected to the pot portion. In some embodiments, the flange further comprises a raised portion, and the raised portion is between the outer ring and the inner ring. In some embodiments, the speaker further comprises a first conductive boar