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US-12627929-B2 - Speaker unit and speaker curved diaphragm

US12627929B2US 12627929 B2US12627929 B2US 12627929B2US-12627929-B2

Abstract

[Problem] Provided is a high-performance and high-quality curved diaphragm speaker system that is capable of reproducing sounds in a plurality of bands and achieves performance sufficient for hard-of-hearing people and hearing people. [Solution] A speaker unit 10 of the present invention includes a first diaphragm 1 in a corn form, a second diaphragm 2 in a curved sheet form, and a driver unit 4 that drives both of the first diaphragm and the second diaphragm. A small diameter side 1 a of the first diaphragm and one end side 2 a of the second diaphragm are both connected to the driver unit. The second diaphragm has a plurality of regions having different resonance characteristics due to a change in the curvature of a diaphragm surface in the middle from the one end side to the other end side in a length direction. This speaker unit is attached to a housing 50 to form a speaker 100.

Inventors

  • Hiroshi Tanaka
  • Masahiro Suzuki

Assignees

  • MIRAI SPEAKER INC.

Dates

Publication Date
20260512
Application Date
20220718
Priority Date
20210720

Claims (12)

  1. 1 . A speaker unit, comprising: a first diaphragm in the form of a cone; a second diaphragm in the form of a sheet forming a curved vibration surface; and a driver unit driving the first diaphragm and the second diaphragm together, wherein the driver unit is connected to a small diameter side of the first diaphragm and one end side of the second diaphragm, and the second diaphragm is provided with means for affixing sheet material on a predetermined region or another region except the predetermined region, and has a plurality of regions of different resonance characteristics in which thickness of vibration surfaces are changed in the middle of a length direction from the one end side toward another end side of the second diaphragm; and the predetermined region includes a boundary with the other region having a tapered shape in which a dimension in a width direction is reduced toward the other end side from the one end side of the second diaphragm.
  2. 2 . The speaker unit according to claim 1 , wherein the second diaphragm is connected to the driver unit via a blade piece in the form of a plate attached to a tip of a voice coil bobbin of the driver unit.
  3. 3 . A speaker unit, comprising: a first diaphragm in the form of a cone; a second diaphragm in the form of a sheet forming a curved vibration surface; and a driver unit driving the first diaphragm and the second diaphragm together, wherein the driver unit is connected to a small diameter side of the first diaphragm and one end side of the second diaphragm, and the second diaphragm is provided with means for applying a coating agent on a predetermined region or another region except the predetermined region, and has a plurality of regions of different resonance characteristics in which hardesses of vibration surfaces are changed in the middle of a length direction from the one end side toward another end side of the second diaphragm; and the predetermined region includes a boundary with the other region having a tapered shape in which a dimension in a width direction is reduced toward the other end side from the one end side of the second diaphragm.
  4. 4 . The speaker unit according to claim 3 , wherein the second diaphragm is connected to the driver unit via a blade piece in the form of a plate attached to a tip of a voice coil bobbin of the driver unit.
  5. 5 . A speaker unit, comprising: a first diaphragm in the form of a cone; a second diaphragm in the form of a sheet forming a curved vibration surface; and a driver unit driving the first diaphragm and the second diaphragm together, wherein the driver unit is connected to a small diameter side of the first diaphragm and one end side of the second diaphragm, and the second diaphragm is provided with means for applying a coating agent on a predetermined region or another region except the predetermined region, and has a plurality of regions of different resonance characteristics in which weights of vibration surfaces are changed in the middle of a length direction from the one end side toward another end side of the second diaphragm; and the predetermined region includes a boundary with the other region having a tapered shape in which a dimension in a width direction is reduced toward the other end side from the one end side of the second diaphragm.
  6. 6 . The speaker unit according to claim 5 , wherein the second diaphragm is connected to the driver unit via a blade piece in the form of a plate attached to a tip of a voice coil bobbin of the driver unit.
  7. 7 . A speaker unit, comprising: a first diaphragm in the form of a cone; a second diaphragm in the form of a sheet forming a curved vibration surface; and a driver unit driving the first diaphragm and the second diaphragm together, wherein the driver unit is connected to a small diameter side of the first diaphragm and one end side of the second diaphragm, and the second diaphragm is provided with means for applying a coating agent on a predetermined region or another region except the predetermined region, and has a plurality of regions of different resonance characteristics in which thickness of vibration surfaces are changed in the middle of a length direction from the one end side toward another end side of the second diaphragm; and the predetermined region includes a boundary with the other region having a tapered shape in which a dimension in a width direction is reduced toward the other end side from the one end side of the second diaphragm.
  8. 8 . The speaker unit according to claim 7 , wherein the second diaphragm is connected to the driver unit via a blade piece in the form of a plate attached to a tip of a voice coil bobbin of the driver unit.
  9. 9 . A speaker unit, comprising: a first diaphragm in the form of a cone; a second diaphragm in the form of a sheet forming a curved vibration surface; and a driver unit driving the first diaphragm and the second diaphragm together, wherein the driver unit is connected to a small diameter side of the first diaphragm and one end side of the second diaphragm, and the second diaphragm is provided with means for affixing sheet material on a predetermined region or another region except the predetermined region, and has a plurality of regions of different resonance characteristics in which hardnesses of vibration surfaces are changed in the middle of a length direction from the one end side toward another end side of the second diaphragm; and the predetermined region includes a boundary with the other region having a tapered shape in which a dimension in a width direction is reduced toward the other end side from the one end side of the second diaphragm.
  10. 10 . The speaker unit according to claim 9 , wherein the second diaphragm is connected to the driver unit via a blade piece in the form of a plate attached to a tip of a voice coil bobbin of the driver unit.
  11. 11 . A speaker unit, comprising: a first diaphragm in the form of a cone; a second diaphragm in the form of a sheet forming a curved vibration surface; and a driver unit driving the first diaphragm and the second diaphragm together, wherein the driver unit is connected to a small diameter side of the first diaphragm and one end side of the second diaphragm, and the second diaphragm is provided with means for affixing sheet material on a predetermined region or another region except the predetermined region, and has a plurality of regions of different resonance characteristics in which weights of vibration surfaces are changed in the middle of a length direction from the one end side toward another end side of the second diaphragm; and the predetermined region includes a boundary with the other region having a tapered shape in which a dimension in a width direction is reduced toward the other end side from the one end side of the second diaphragm.
  12. 12 . The speaker unit according to claim 11 , wherein the second diaphragm is connected to the driver unit via a blade piece in the form of a plate attached to a tip of a voice coil bobbin of the driver unit.

Description

TECHNICAL FIELD The present invention relates to a speaker unit using a curved diaphragm and a speaker using the same and specifically relates to a high performance and high quality curved diaphragm speaker system that allows hearing-impaired people to hear together with hearing people without wearing a hearing aid and that expands a reproduction frequency bandwidth and improves the sound quality. BACKGROUND ART Recent years, the number of people with hearing difficulties such as age-related hearing loss caused by aging, organic hearing loss with a damage to the external ear, the middle ear, the internal ear, the cochlear nerve, and the like, and functional hearing loss caused by stress has been increased. In a case of hearing loss, it is not only a loss of a sense of hearing but also it is difficult to distinguish clearly even the sounds that can hear. For this reason, in some cases, a misunderstanding of a conversation partner may be caused by answering without fully understanding the content of the conversation, or a lively conversation cannot be made because of repeatedly asking of what is said. Additionally, it has been said that there is a risk that an inability to communicate smoothly due to the hearing loss may cause a phenomenon where it becomes troublesome unconsciously to have a conversation, which leads less opportunities to meet with people and a tendency to stay at home, and there may occur a problem of social isolation and exclusion. In general, use of a hearing aid is a means of reducing the inconveniences of the hearing loss as described above. Additionally, for a case of watching television, there is an FM transmitter that obtains the sound of the television by being connected to an earphone jack of the television to transmit the sound via FM radio waves and receive the FM radio waves with the own FM radio. However, the hearing aid has not been preferably used and has been used reluctantly in many cases because of the reasons such as “troublesome” and “embarrassing to wear”. Additionally, there are many hearing aids that also pick up the noises, which rather causes great stress in some cases. On the other hand, in a case of using the FM transmitter, it is troublesome that it is required to prepare the FM transmitter and Install the FM transmitter every time watching television. Additionally, there is a problem that, since the output destination of the sound is switched by connecting the FM transmitter to the earphone jack, it is impossible for hearing-impaired people and hearing people to comfortably watch the television together. To deal with this, as a speaker that generates sound that not all the hearing-impaired people but most of the hearing-impaired people can hear, there has been proposed by the applicant a speaker that includes a housing with a hollow structure, a driving unit stored in the housing, and a curved diaphragm arranged on a surface of the housing and that is configured to emit the sound by transmitting vibrations of the driving unit to an end edge portion of the curved diaphragm (for example, see Patent Literatures 1 and 2). Such a speaker using the curved diaphragm (hereinafter, simply referred to as a “curved diaphragm speaker”) allows hearing-impaired people to hear without wearing a hearing aid and also allows hearing people to hear without discomfort. In addition, with the curved diaphragm speaker according to the inventions disclosed in Patent Literatures 1 and 2, it could be confirmed in a later demonstration experiment that it allows for hearing of close sounds as a matter of course but also for clear hearing of sounds in the distance. That is, it allows for hearing with no cracking sound like when the volume is turned up excessively and also for hearing of close sounds at a volume not excessively loud. It has been confirmed that this curved diaphragm speaker has a basic performance at an applicable level; however, it has been demanded in the expansion of a reproduction frequency bandwidth, particularly in a low sound bandwidth equal to or less than 400 to 500 Hz (hereinafter, referred to as a “low frequency”), to enhance the sound quality with an improvement in the reproduction performance. Here, the curved diaphragm speaker is in general a means that drives the curved diaphragm by a moving coil, which is so-called a voice coil, and generates sound. In order to increase the reproduction capability on the low frequency side with this means, there are required an increase in the amount of voice coil amplitude (movement) appropriate for the capability, a diaphragm and a structure appropriate for the voice coil amplitude, and powerup. However, if the amount of the amplitude of the voice coil is increased forcibly to increase the reproduction capability on the low frequency side, the curved diaphragm itself makes abnormal sound. For this reason, in order to perform the low frequency reproduction equivalent to that by a conventional type speaker, the area of the curv