WO2005048651A1 - Haut-parleur d'aigus - Google Patents

Haut-parleur d'aigus Download PDF

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Publication number
WO2005048651A1
WO2005048651A1 PCT/JP2004/016771 JP2004016771W WO2005048651A1 WO 2005048651 A1 WO2005048651 A1 WO 2005048651A1 JP 2004016771 W JP2004016771 W JP 2004016771W WO 2005048651 A1 WO2005048651 A1 WO 2005048651A1
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WO
WIPO (PCT)
Prior art keywords
dome
cone
surface area
voice coil
diaphragm
Prior art date
Application number
PCT/JP2004/016771
Other languages
English (en)
Japanese (ja)
Inventor
Shoji Tanaka
Takafumi Yuasa
Takashi Suzuki
Hiroko Yamazaki
Yachiyo Shimokawatoko
Original Assignee
Matsushita Electric Industrial Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co., Ltd. filed Critical Matsushita Electric Industrial Co., Ltd.
Priority to CN2004800334562A priority Critical patent/CN1879447B/zh
Priority to EP04818500A priority patent/EP1694092A4/fr
Publication of WO2005048651A1 publication Critical patent/WO2005048651A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/12—Non-planar diaphragms or cones
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2307/00—Details of diaphragms or cones for electromechanical transducers, their suspension or their manufacture covered by H04R7/00 or H04R31/003, not provided for in any of its subgroups
    • H04R2307/027—Diaphragms comprising metallic materials

Definitions

  • the present invention relates to a treble speaker (also referred to as a tweeter) for reproducing a sound in an ultra-high sound range up to 100 kHz.
  • a treble speaker also referred to as a tweeter
  • Patent Documents 1 to 4 disclose conventional examples of treble speakers that reproduce sound in an ultra-high frequency range. Each of the speakers disclosed in Patent Documents 1 to 4 uses a semi-dome-shaped diaphragm. A speaker with a semi-dome type diaphragm is called a semi-dome type speaker.
  • FIG. 12 is a cross-sectional view of a typical semi-dome type treble speaker of the first conventional example (hereinafter, “treble speed” is simply abbreviated to “speaker”).
  • a semi-dome type diaphragm 31 includes a dome portion 31a and a cone portion 31c surrounding the dome portion 31a. corn The outer periphery of the part 31c is attached to the frame 34 via the edge part 31e. The dome portion 31a, the cone portion 31c, and the edge portion 31e are formed by integrally molding a resin film.
  • a voice coil 32 is attached to a 3 lb boundary between the dome 3 la and the cone 31 c.
  • the frame 34 is attached to a field section 33 having an annular magnet 35.
  • the material of the diaphragm 31 is, for example, polyethylene naphthalate (PEN) and the thickness is 0.0705 mm.
  • the diameter of the voice coil 32 is about 16mm, and the outer diameter of the edge 31e is about 25mm. .
  • FIG. 13 is a cross-sectional view of a second conventional dome-shaped speaker, and has a nominal diameter of 25 mm.
  • the outer periphery of the dome-shaped diaphragm 41 is provided with an edge portion 41e, and the outer periphery of the edge portion 41e is attached to a frame 44.
  • a voice coil 42 is attached to the outer periphery of the diaphragm 41.
  • the frame 44 is attached to a field section 43 having an annular magnet 45.
  • the diaphragm 41 is formed of, for example, a titanium foil having a thickness of 0.025 mm, and has a diameter of about 25 mm.
  • FIG. 14 shows sound pressure frequency characteristics of the first and second conventional speakers.
  • a solid curve a indicates the characteristics of the first conventional speaker shown in FIG. 12, and a dotted curve b indicates the characteristics of the second conventional speaker shown in FIG.
  • the high-frequency reproduction limit frequency increases as the weight of the voice coil decreases, as the gradient of the root of the diaphragm increases, and as the height of the diaphragm increases.
  • the high-frequency limit frequency for reproduction is higher as the Young's modulus of the diaphragm material is larger.
  • the semi-dome type speaker can have the voice coil diameter smaller than the voice coil diameter of the dome type speaker due to its structure. As a result, the weight of a semi-dome type voice coil is
  • the weight of a voice coil is proportional to the square of the diameter.
  • the diaphragm is formed by using a resin film having good moldability. Height can be increased (second condition). Under the above first and second conditions, in a speaker having a semi-dome type diaphragm, the diaphragm is formed of resin having a Young's modulus smaller than that of metal! The high-frequency reproduction limit frequency can be made higher than that of a speaker having a dome-shaped diaphragm.
  • Patent Document 1 JP-A-57-23392
  • Patent Document 2 JP-A-63-38398
  • Patent Document 3 JP-A-05-236591
  • Patent Document 4 Japanese Utility Model Application No. 02-118393
  • Non-Patent Document 1 "Speaker 'System Top", edited by Takeo Yamamoto P158, 213
  • the semi-dome-shaped diaphragm of the first conventional example has a complicated shape. Therefore, it is not easy to mold a metal plate such as titanium foil into an accurate semi-dome shape! Wrinkling and breakage often occur during press molding, and the cost is high due to poor yield. For example, if the total height h of the diaphragm 31 shown in FIG. 12 is extremely low, the wrinkles and breakage can be prevented. However, if the overall height h is reduced, the high-frequency limit for reproduction cannot be increased as described above, even if a metal having a high Young's modulus is used. Therefore, conventionally, it was common to make a semi-dome type diaphragm using a resin film having good moldability.
  • An object of the present invention is to provide an inexpensive treble speaker that has excellent sound pressure frequency characteristics in a high frequency range and an ultra-high frequency range.
  • a treble speaker according to the present invention is a semi-dome-shaped speaker in which a dome portion, a cone portion provided around the dome portion, and an edge portion provided around the cone portion are formed by integrally molding a thin metal plate. With a diaphragm.
  • a voice coil is connected to a boundary between the dome and the cone.
  • the angle between the tangent to the surface of the dome portion at the boundary between the dome portion and the cone portion and a reference plane perpendicular to the central axis of the voice coil is defined as the "root slope angle of the dome portion".
  • the angle between the tangent to the surface of the surface and the reference plane is defined as the "root slope angle of the cone”
  • the difference between the root slope angle of the dome and the root slope angle of the cone is defined.
  • the ratio of the larger of the dome slope angle and the cone slope angle to the larger one is set to 15% or less.
  • the ratio of the difference between the surface area of the dome portion and the surface area of the cone portion to the larger of the surface area of the dome portion and the surface area of the cone portion is set to 15% or less.
  • the difference between the root inclination angle of the dome portion of the diaphragm and the root inclination angle of the cone portion is larger than the difference between the root inclination angle of the dome portion and the root inclination angle of the cone portion. Pressing this diaphragm by setting the ratio of the diaphragm to the base slope angle to 15% or less.
  • the tension acting on the material becomes a dome. It is almost equal on the part side and the cone part side. For this reason, the material does not move while rubbing the mold at the mold that presses the boundary between the dome and the cone. No wrinkles or breaks occur in the material near the boundary between the cone and the cone.
  • the material in the pressing step is reduced.
  • the sum of the amount of extension to form the dome and the sum of the amount of extension to form the cone is approximately equal.
  • the entire material is stretched almost evenly.
  • the difference between the root inclination angles of the dome and the cone to 15% or less as described above, the rigidity of the roots of the dome and the cone becomes almost the same.
  • the driving force of the voice coil is evenly transmitted to the dome and the cone. For this reason, there is no large disturbance in the sound pressure frequency characteristics where the resonance mode of only one of the dome portion and the cone portion does not appear strongly.
  • a metal semi-dome-shaped diaphragm is used as the diaphragm of the loudspeaker, and the difference between the root inclination angle of the dome portion of the diaphragm and the root inclination angle of the cone portion is obtained.
  • the ratio between the angle of the root slope of the cone and the angle of the root of the cone is less than 15%.
  • the ratio of the difference between the surface area of the dome portion and the surface area of the cone portion to the larger of the surface area of the dome portion and the surface area of the cone portion is set to 15% or less.
  • the resonance mode does not appear strongly in either the dome portion or the cone portion. Therefore, peaks and dips in the sound pressure frequency characteristics are reduced, and excellent sound pressure frequency characteristics are obtained.
  • FIG. 1 (a) is a plan view of a treble speaker according to Embodiment 1 of the present invention
  • FIG. 1 (b) is a plan view of FIG.
  • FIG. 2 is a cross-sectional view of a mold during press molding of a diaphragm used for a treble speaker according to Embodiment 1 of the present invention.
  • FIG. 3 is a cross-sectional view of a mold during press molding of a diaphragm made by an inventor of the present invention in an experimental stage leading to the present invention.
  • FIG. 4 is a cross-sectional view of a mold during press molding of another diaphragm made by the inventor of the present invention in an experimental stage leading to the present invention.
  • FIG. 5 is a sound pressure frequency characteristic diagram of a treble speaker according to Embodiment 1 of the present invention.
  • FIG. 6 is a sound pressure frequency characteristic diagram of a treble speaker using a diaphragm at an experimental stage leading to the present invention.
  • FIG. 7 is a sound pressure frequency characteristic diagram of a treble speaker using another diaphragm at the experimental stage leading to the present invention.
  • FIG. 8 is a partial cross-sectional view of a diaphragm of a treble speaker according to Embodiment 2 of the present invention.
  • FIG. 9 is a partial cross-sectional view of a diaphragm of a treble speaker according to Embodiment 3 of the present invention.
  • FIG. 10 is a sound pressure frequency characteristic diagram of a treble speaker according to Embodiment 2 of the present invention.
  • FIG. 11 is a sound pressure frequency characteristic diagram of a treble speaker using still another diaphragm at an experimental stage leading to the present invention.
  • FIG. 12 is a cross-sectional view of a conventional treble speaker
  • Figure 13 is a cross-sectional view of another conventional treble speaker
  • Figure 14 is a sound pressure frequency characteristic diagram of a conventional treble speaker
  • the treble speaker of the present invention includes a metal semi-dome-shaped diaphragm shown below.
  • This diaphragm has a cone portion on the outer periphery of the dome portion, and the difference between the root slope angle of the dome portion and the root slope angle of the cone portion is defined as the difference between the root slope angle of the dome portion and the root slope angle of the cone portion.
  • the ratio of the larger value to the root slope angle is set to 15% or less. Further, the ratio of the difference between the surface area of the dome and the surface area of the cone to the larger of the surface area of the dome and the surface of the cone is set to 15% or less.
  • the metal foil when press-molding using the metal foil that is the material of the metal diaphragm, the metal foil does not move at the boundary between the dome and the cone inside the mold of the molding press. . Therefore, the metal foil of each of the dome portion and the cone portion is evenly stretched inside the mold during the press molding, and the total elongation of each is substantially equal. For this reason, even when the overall height of the diaphragm is high, it is possible to obtain a metal semi-dome-shaped diaphragm having a desired shape without breaking or wrinkling during molding. Since the semi-dome-shaped diaphragm can be made of a metal material having a high Young's modulus, the high-frequency reproduction limit frequency is increased, and super-high-frequency sound reproduction becomes possible.
  • the surface area of the dome portion and the cone portion are defined as the difference between the surface areas of the dome portion and the cone portion.
  • a cylindrical voice coil fitting portion surrounding the dome portion is provided below the base of the dome portion.
  • the ratio of the difference between the total surface area of the voice coil fitting section and the dome section and the surface area of the cone section to the larger of the total surface area and the surface area of the cone section is 15% or less.
  • the ratio of the height of the voice coil fitting part to the voice coil diameter is set to 5% or less.
  • a cylindrical voice coil fitting portion surrounding the cone portion is provided below the root of the cone portion.
  • the ratio of the difference between the total surface area of the voice coil fitting part and the cone part and the surface area of the dome part to the larger of the total surface area and the surface area of the dome part is 15% or less.
  • the ratio of the height of the voice coil fitting to the voice coil diameter shall be 5% or less.
  • FIG. 1 (a) is a plan view of a treble speaker having a semi-dome-shaped diaphragm of Example 1 of the present invention
  • FIG. 1 (b) is a lb-lb sectional view of (a).
  • the nominal diameter of this treble speaker (hereinafter simply referred to as “speaker”) is 25 mm. .
  • the diaphragm 1 has a circular dome la and an outer periphery of the dome la.
  • a cone portion lc formed at the edge portion, an edge portion le formed at the outer periphery of the cone portion lc, and a mounting portion If formed at the outer periphery of the edge portion le.
  • the dome part la, cone part lc, edge part le, and mounting part If are formed by integral molding of a thin metal plate (metal foil).
  • the voice coil 2 is attached to the first boundary part lb between the dome part la and the cone part lc.
  • Diaphragm 1 is attached to frame 4 of field part 3 at attachment part If.
  • the field portion 3 has a known configuration, and an annular magnet 3b is provided between the field plate 3a and the yoke 3c.
  • the cone part lc is formed between the first boundary part lb and the second boundary part Id which is the top of the cone part lc.
  • the edge le from the second boundary Id to the attachment If has a smoothly descending slope.
  • the specifications of the diaphragm 1 of the first embodiment are as follows.
  • the material of the diaphragm 1 is a titanium foil having a thickness of 0.025 mm.
  • the diameter of the dome la is 16.5 mm, and the diameter of the voice coil 2 is also 16.5 mm.
  • the diameter of the second boundary Id is 23 mm, and the outer diameter of the edge le is 25 mm.
  • the root inclination angle ⁇ 1 of the dome la is 28 degrees, and the root inclination angle ⁇ 2 of the cone lc is 30 degrees, and the difference is 2 degrees.
  • the ratio of 2 degrees to 30 degrees is about 6.7%
  • the total height hi of the dome la is 2.1 mm, and the radius of curvature of the dome la is 17.5 mm.
  • the total height h2 of the cone lc is 1.5 mm, which is lower than the total height hi of the dome la.
  • the surface area of the dome portion la 2. a 27cm 2, the surface area of the cone portion lc 2. 33cm 2 der is, both of which are made in approximately the same area.
  • FIG. 5 is a sound pressure frequency characteristic diagram of a speaker using the diaphragm 1 of the first embodiment.
  • the reproduction lower limit frequency is about 1.5kHz.
  • the maximum playback frequency was measured only up to 100kHz, but it is estimated to be above this.
  • the speaker using the diaphragm 1 of the first embodiment has excellent super-high-range sound reproduction capability with a small large peak-to-dip.
  • FIG. 2 is a cross-sectional view of a pressing force mold 15 for molding the vibration plate 1 of the first embodiment
  • FIGS. 3 and 4 respectively show various molds used in experiments by the inventor. It is sectional drawing of the metal mold
  • a metal foil titanium foil or the like
  • the lower mold 6 has a dome convex portion 6a formed at the center portion, and a first boundary concave portion 6b formed at the outer periphery thereof.
  • a second boundary portion convex portion 6d is formed on the outer periphery of the first boundary portion concave portion 6b.
  • the upper mold 7 has a dome concave portion 7a at the center and a first boundary convex portion 7b at the outer periphery thereof.
  • a second boundary concave portion 7d is formed on the outer periphery of the first boundary convex portion 7b.
  • a convex flat portion 7f having a flat surface at the top is formed.
  • the angle ⁇ 1 of the root slope of the dome portion la of the completed diaphragm 1 and the angle 0 2 of the root slope of the cone portion lc are substantially equal to each other.
  • a first boundary concave portion 6b of the mold 6 and a first boundary convex portion 7b of the upper mold are set.
  • the term “moving” means that the material 5 moves while rubbing the surface of the mold.
  • the occurrence of wrinkles and breaks in the pressing process is often caused by the material 5 being displaced and moving in the mold 15, so that wrinkles and fractures do not occur unless the material 5 is displaced and moved as described above.
  • the surface area of the dome la and the surface area of the cone lc are made substantially equal. Therefore, in the pressing step, the total amount of the material 5 extending to form the dome portion la is substantially equal to the total amount of the material 5 extending to form the cone portion lc. Since the whole of the material 5 extends almost uniformly, the formability is good. Because of good moldability, molding It is not necessary to divide the process into many stages (several stages). By reducing the number of stages, the cost of the mold and the molding time are reduced, and the cost of the diaphragm 1 can be reduced.
  • the root inclination angle ⁇ 1 of the dome portion 16 a of the diaphragm formed by the die 16 is 46 degrees
  • the root inclination angle ⁇ 2 of the cone portion 16 c is 29 degrees
  • the angle ⁇ 1 is smaller than the angle ⁇ 2. It is formed to be about 17 degrees larger. If the angle ⁇ 1 is larger than the angle ⁇ 2, the lower mold 6 and the upper mold 7 are closed and the material 5 which becomes the dome portion 16a is pressed in the process of pressing the material 5 so that the cone portion 16c Becomes larger than the tension applied to the material 5.
  • the material 5 is shifted between the first boundary concave portion 6b and the first boundary convex portion 7b toward the dome portion 16a.
  • wrinkles occur in the dome portion 16a of the diaphragm after molding. If the amount of displacement is large, the material breaks at the boundary between the dome 16a and the cone 16c.
  • the root slope angle ⁇ 1 of the dome portion 17a of the diaphragm formed by the die 17 is 24 degrees
  • the root slope angle ⁇ 2 of the cone portion 17c is 42 degrees
  • the angle ⁇ 1 is the angle ⁇ It is formed to be about 18 degrees smaller than 2. If the angle ⁇ 1 is smaller than the angle ⁇ 2, the lower mold 6 and the upper mold 7 are closed and the tension applied to the material of the cone portion 17c is increased in the process of pressing the material 5 and the material of the dome portion 17a is pressed. It becomes larger than the tension applied.
  • the material 5 moves between the first boundary concave portion 6b and the first boundary convex portion 7b with a force toward the cone portion 17c.
  • wrinkles occur in the cone portion 17c of the diaphragm after molding. If the amount of displacement is large, the material 5 breaks at the boundary between the dome portion 17a and the cone portion 17c.
  • the above ratio is about 1 If it is less than 5%, it has been found that there is almost no shift movement. Therefore, in this embodiment, the difference between the root inclination angle ⁇ 1 of the dome portion 16a and the root inclination angle ⁇ 2 of the cone portion 16c is the root inclination angle 01 of the dome portion 16a and the root inclination angle of the cone portion 16c. If the ratio of the larger of the degrees ⁇ 2 to the root inclination angle is 15% or less, diaphragm 1 can be manufactured with a high yield that does not cause wrinkling or breakage of material 5 during press molding. .
  • the radius of curvature of the dome convex portion 6a of the lower mold 6 and the dome concave portion 7a of the upper mold 7 are the mold radii of the first embodiment shown in FIG. It is larger than the radius of curvature of the 15 dome convex portions 6a and the dome concave portions 7a. Therefore, the overall height of the dome portion 17a of the diaphragm after molding is lower than the overall height of the dome portion la of the diaphragm 1 of the present embodiment molded by the mold 15.
  • the first boundary convex portion 7b is first formed during the closing process of the lower die 6 and the upper die 7.
  • the dome convex portion 6a comes into contact with the plate-shaped material 5 after the two are further closed. Therefore, it was found that even when the angle 01 and the angle 02 were substantially the same, a slight shift movement occurred in the first boundary convex portion 7b. This displacement may cause wrinkles in the dome portion 17a. From this, it was found that it is desirable that the overall height of the dome be somewhat high. According to the experiment of the inventor, it is desirable that the total height (hi) of the dome portion is about 0.8 times or more the total height (h2) of the cone portion.
  • FIG. 6 shows a sound pressure frequency characteristic of a speaker using a diaphragm molded using the mold 16 shown in FIG.
  • the specifications of this speaker are as follows.
  • the nominal diameter is 25mm, and the diameter of the voice coil is 16.5mm, which is almost the same as the diameter of the dome 16a.
  • the root inclination angle ⁇ 1 of the dome portion 16a is substantially equal to the root inclination angle ⁇ 2 of the cone portion 16c, but the surface area of the cone portion 16c is smaller than the surface area of the dome portion 16a.
  • the surface area of [0042] the dome portion 16a is 2. a 3 cm 2, the total height is 2. 3 mm of the dome portion 16a.
  • the radius of curvature of the dome section 16a is 16 mm.
  • the surface area of the cone 16c is 1.7 cm 2 , and the total height of the cone 16c is 1.3 mm.
  • the surface area of the dome 16a is about 1.35 times the surface area of the cone 16c.
  • the root slope angle 01 of the dome 16a and the root slope angle ⁇ 2 of the cone 16c are both 31 degrees.
  • the diameter of the boundary between the cone 16c and the edge 16e is 21.5 mm, and the outer diameter of the edge 16e is 23.5 mm.
  • the solid line curve a in FIG. 6 shows that the root slope angle ⁇ 1 of the dome portion 16a and the root slope angle ⁇ 2 of the cone portion 16c are the same, but the surface area of the cone portion 16c is equal to the surface area of the dome portion 16a.
  • the surface area of the dome 16a of this speaker is 2.26 cm 2
  • the total height of the dome 16a is 2. Omm
  • the radius of curvature of the dome 16a is 18 mm.
  • the surface area of the cone 16c is 3.2 cm 2
  • the total height of the cone 16c is 1.3 mm.
  • the surface area of the cone 16c is about 1.42 times the surface area of the dome 16a.
  • the root inclination angle ⁇ 1 of the dome portion 16a is 27.3 degrees, and the root inclination angle ⁇ 2 of the cone portion 16c is 30 degrees.
  • the diameter of the second boundary portion 16d between the cone portion 16c and the edge portion 16e is 25 mm, and the outer diameter of the edge portion 16e is 27 mm.
  • the mass of the dome portion 16a is significantly larger than the mass of the cone portion 16c. Therefore, the driving force of the voice coil 2 is distributed more to the dome portion 16a having a large mass. Since the radiation area of the dome portion 16a is larger than the radiation area of the cone portion 16c, the resonance mode of the dome portion 16a appears strongly in the sound pressure frequency characteristics. As shown by the solid curve a in FIG. 6, a large dip occurs at a large resonance peak and a lower frequency.
  • the mass of the cone 16c is larger than that of the dome 16a. Therefore, the driving force of the voice coil 2 is distributed more toward the cone 16c. Since the radiation area of the cone 16c is larger than the radiation area of the dome 16a, the resonance mode of the cone 16c appears strongly in the sound pressure frequency characteristics. As shown by the dotted curve b in FIG. 6, the frequency of the resonance peak is lower than that of the curve a, and a large dip occurs at a higher frequency.
  • the difference between the root inclination angle ⁇ 1 of the dome portion 16a and the root inclination angle ⁇ 2 of the cone portion 16c is If it is large, the difference in rigidity (stiffness) at the base of the dome portion 16a and the cone portion 16c becomes large, and the disturbance of the sound pressure frequency characteristics tends to be further increased.
  • the root slope angle ⁇ 1 of the dome part la and the root slope angle ⁇ 2 of the cone part lc are substantially equal, and the surface area of the dome part la and the surface area of the cone part lc are made equal. They are almost equal.
  • the masses of the dome portion la and the cone portion lc are substantially equal, and the rigidities of the roots of the dome portion la and the cone portion lc are also substantially equal.
  • the driving force of the voice coil 2 is evenly transmitted to the dome portion la and the cone portion lc of the diaphragm 1. Therefore, a resonance mode of only one of the dome portion la and the cone portion lc appears strongly, and an excellent sound pressure frequency characteristic as shown in FIG. 5 can be obtained without largely disturbing the sound pressure frequency characteristic.
  • the diaphragm 1 of the loudspeaker of the first embodiment has a shallower shape with a larger radius of curvature and a smaller height hi as compared to the diaphragm of a general loudspeaker currently on the market.
  • the resonance modes of dome la and cone lc are not completely independent of each other.
  • the voice coil 2 which is the driving unit the resonance mode of the dome part la and the resonance mode of the cone part lc tend to be mutually inverted modes. Therefore, when the surface area and the mass of the dome part la and the cone part lc are substantially equal, the peak-dip of each resonance tends to cancel each other, and the sound pressure frequency characteristic tends to be smooth.
  • FIG. 7 shows the sound pressure frequency characteristics of the speaker at the experimental stage of the inventor of the present invention.
  • a thick solid line curve a represents the sound pressure frequency characteristics of the speaker of the first embodiment.
  • a thin solid line curve b indicates that in the diaphragm 1 of the first embodiment, the root inclination angle ⁇ 1 of the dome portion is 29 degrees, and the root inclination angle ⁇ 2 of the cone portion is 29.5 degrees.
  • the surface area of the dome portion la and 2. 2 cm 2 has a surface area of the cone portion lc and 1. 92cm 2. In other words, a diaphragm that is approximately 1.15 times the surface area of the dome section la was used. It is a sound pressure frequency characteristic of a speaker.
  • curve c in Fig. 7 shows that a large peak around 20kHz is significantly reduced.
  • the curve c in FIG. 7 is compared with the most preferable curve a in FIG. 7, it can be seen that the peak falls within a change within 3 dB.
  • the curve b in FIG. 7 shows that the large dip around 25 kHz is greatly reduced as compared with the curve a in FIG.
  • the dip is within about 3 dB compared to the curve a in FIG. In other words, if the ratio of the difference between the surface area of the dome la and the surface area of the cone lc to the larger surface area is within about 15%, the occurrence of large peaks and dips can be avoided.
  • the thickness of the diaphragm 1 of the dome la and the cone lc is constant, and the mass of the dome la and the cone lc is proportional to the surface area. If the thickness of the diaphragm 1 is not uniform, the respective surface areas should be designed so that the ratio of the larger difference between the masses of the dome part la and the cone part lc to the mass is within about 15%. ,.
  • an inexpensive speaker having excellent sound pressure frequency characteristics capable of reproducing up to a super-high sound range can be realized.
  • a thin plate such as a beryllium, aluminum, aluminum alloy duralumin, magnesium alloy, copper, brass, or the like may be used as the material of the semi-dome-shaped diaphragm.
  • the shape of the dome portion of the diaphragm is spherical, but the effect of the present invention can be obtained even with an aspheric surface such as an elliptical shell-shaped surface.
  • FIG. 8 is a cross-sectional view of the right half of the diaphragm 11 with a spin force according to the second embodiment, and the left half (not shown) is symmetric with respect to the center line C.
  • the semi-dome-shaped diaphragm 11 has a circular dome portion lla, a cylindrical voice coil fitting portion 1 lg formed on the outer periphery of the dome portion 11 a, and a voice coil fitting portion 1 lg. It has a cone part formed around the circumference.
  • the cone portion 11c is connected to the edge portion 1 le via a second boundary portion 1Id which is the top of the cone portion 11c! /.
  • a mounting portion 1If is formed on the outer circumference of the edge portion 1le.
  • the dome part lla, the voice coil fitting part llg, the cone part 1lc, the edge part lie, and the mounting part 1If are formed by integral molding of titanium foil.
  • the height of the voice coil fitting portion llg is 0.4 mm, and the tip lli has a curved surface (R) with a radius of about 0.2 mm so as not to break during the press molding process.
  • the inner peripheral portion l lh of the voice coil fitting portion l lg is formed in a taper shape such that the diameter gradually decreases from the tip portion ll toward the dome portion 11a. By having this tipper shape, the material can be prevented from being broken at the time of press molding, and the winding frame (bobbin) of the voice coil 12 is attached to the inner periphery 1 lh of the voice coil fitting portion 1 lg during assembly. The work of inserting 12a becomes easy.
  • the nominal diameter of the speaker of the second embodiment is 25 mm.
  • the material of the diaphragm 11 is a titanium foil having a thickness of 0.025 mm.
  • the outer diameter of the dome 11a (diameter of the first boundary lib) is 17 mm, and the diameter of the second boundary lid between the cone 11c and the edge lie is 24 mm.
  • the outer diameter of the edge part ie is 26 mm.
  • the root inclination angle 01 of the dome portion 11a of the diaphragm 11 is 28 degrees, and the root inclination angle ⁇ 2 of the cone portion 11c is 30 degrees, and both are almost equal.
  • the diameter of the base of the dome 11a is 16.6 mm.
  • the overall height hi of the dome 11a is 2.1 mm, and the radius of curvature is 17.6 mm.
  • the total height h2 of the cone 11c is 1.5 mm.
  • the diameter of the winding frame 12a of the voice coil 12 is 16.5 mm, and the upper winding frame 12a is inserted into the inner peripheral portion l lh of the voice coil fitting portion l lg. After the insertion, an adhesive is applied to the first boundary portion l ib and the inner peripheral portion l lh, and the winding frame 12 a is fixed to the diaphragm 11. By applying the adhesive also to the first boundary portion l ib, the rigidity of the portion where the curved surface of the boundary portion l ib is formed is not reduced, and the sound pressure frequency characteristics in the high range are not deteriorated.
  • the semi-dome-shaped diaphragm 11 that does not cause wrinkles or breakage in press molding using titanium foil as a material can be easily formed. Can be molded.
  • the following effects can be obtained by providing the voice coil fitting portion 1 lg on the outer periphery of the dome portion 1 la. That is, when the winding frame 12a of the voice coil 12 is attached to the diaphragm 11, the winding frame 12a is securely held by inserting the winding frame 12a into the voice coil fitting portion 11g. Therefore, the assembling work is extremely easy, and troubles such as misalignment at the time of assembling do not easily occur, and mass productivity is excellent. Also, since no jigs are required for assembly, manufacturing costs are reduced. A range of 0.4 mm in height of the voice coil fitting portion 11g is bonded to the winding frame 12a. Therefore, a high bonding strength can be obtained, and the reliability of the speaker can be improved.
  • FIG. 10 shows the sound pressure frequency characteristics of the speaker of the second embodiment.
  • the peak and dip in FIG. 10 are slightly higher, but the high-frequency reproduction limit frequency exceeds 100 kHz, and the excellent sound pressure frequency is excellent. It takes only half the time that characteristics are obtained.
  • the inventor conducted various experiments and found that the dome portion l la, the cone portion l lb, and the voice coil fitting portion. I got the best specifications of llg. Hereinafter, the process will be described in detail.
  • the surface area of the dome portion 11a is represented by Sa
  • the surface area of the cone portion 11c is represented by Sc
  • the surface area of the voice coil fitting portion 11g is represented by Sg.
  • the inventor made a speaker having three types of experimental diaphragms 11 in which the relationship between the areas Sa, Sc and Sg was expressed by the following equations (1), (2) and (3), respectively. Was investigated.
  • Each of the diaphragms 11 is a titanium foil having a thickness of 0.025 mm.
  • the dimensions of the dome portion 11a and the voice coil fitting portion are the same as those of the second embodiment.
  • the root inclination angle of the dome 11a is 28 degrees, and the root inclination angle of the cone is 30 degrees, which is almost the same.
  • FIG. 11 shows the sound pressure frequency characteristics of a speaker using the three types of experimental diaphragms.
  • a dotted curve a represents the sound pressure frequency characteristics of the speaker using the diaphragm 11 having the relationship shown in the equation (1).
  • Area Sgi or 0. 27cm 2 an area Sai or 2. 31cm 2, an area Sd or 3. 2 cm 2, surface multiply-add (Sa + Sg) is 2. 58cm 2.
  • the area Sc is about 24% larger than the sum of the areas (Sa + Sg).
  • a peak is generated around 20 kHz as shown by the curve a in FIG. 11, which is inferior to the sound pressure frequency characteristic in FIG.
  • a thin solid line curve b in Fig. 11 is a case where the areas Sa and Sc are almost the same and the relation of the equation (2) is satisfied.
  • Area Sa is 2. 31cm 2
  • the area Sc is 2. 2 cm 2
  • the area Sa, the sum of Sg (Sa + Sg) is 2. 58cm 2.
  • the area Sc is about 15% less than the sum of the areas (Sa + Sg).
  • a small dip occurs around 25 kHz! /, But the large peak around 20 kHz disappears.
  • the sound pressure frequency characteristic of the second embodiment shown in FIG. 5 is slightly close to the allowable range, it is not the best.
  • a thick solid line curve c in FIG. 11 is for the diaphragm 11 of the second embodiment having the relationship of the equation (3), and excellent sound pressure frequency characteristics are obtained. Since the voice coil fitting portion 1lg and the winding frame 12a of the voice coil 12 are fixed to each other with an adhesive, the voice coil fitting portion llg operates integrally with the voice coil 12. From that point, the inventor initially thought that it was not necessary to reduce the surface area of the voice coil fitting portion llg to the surface area of the dome portion 11a.
  • the voice coil fitting portion l lg does not operate as a part of the voice coil 12 and the dome portion 11a It was found to work as part of It was also found that the best result could be obtained by setting the point force so that the total surface area of the voice coil fitting portion 1 lg was adjusted to the surface area of the dome portion 11a and the surface area of the cone portion 11c were substantially equal.
  • the first boundary portion l ib is a force between the dome portion 11a and the voice coil fitting portion 1lg.
  • the first boundary portion l ib may be a curved surface so that the portion 1 lg is connected to the curved surface.
  • the first boundary part l ib is formed into a curved surface, its radius of curvature is large in view of the formability of the diaphragm 11. If the radius of curvature is large, the positioning accuracy of the voice coil 12 may be reduced in the step of attaching the voice coil 12 to the voice coil fitting portion 11g.
  • Jigs may be required for accurate positioning, and the working time may be prolonged, resulting in poor productivity. Therefore, the radius of curvature is preferably about 0.2 mm or less.
  • FIG. 9 is a cross-sectional view of the right half of the diaphragm 21 having a sprung force (nominal diameter of 25 mm) of the third embodiment, and the left half is not shown because it is symmetrical about the center line.
  • the diaphragm 21 in the third embodiment is of a semi-dome type, and has a dome part 21a, a cone part 21c, an edge part 21e, and a mounting part 21f.
  • a voice coil fitting portion 21g is provided below the root of the cone portion 21c.
  • diaphragm 21 The specifications of diaphragm 21 are as follows.
  • the material of the diaphragm 21 is a 0.025 mm-thick titanium foil.
  • the diameter of the first boundary 21b is 16.2 mm, and the diameter of the voice coil 22 is 16.5 mm.
  • the diameter of the second boundary 21d between the cone 21c and the edge 21e is 22.5 mm.
  • the outer diameter of the edge 21e is 24.5 mm.
  • the root inclination angle 01 of the dome portion 21a is 28.5 degrees, and the root inclination angle ⁇ 2 of the cone portion 21c is 27 degrees, which are almost equal.
  • the surface area of the dome portion 21a is 2.2 cm 2
  • the surface area of the voice coil fitting portion 21g is 0.27 cm
  • the surface area of the cone portion 21c is 2.05 ⁇ .
  • the total surface area of the cone part 21c and the voice coil fitting part 21g is 2.32 cm 2 .
  • the total surface area of the cone part 21c and the voice coil fitting part 21g is made substantially equal to the surface area of the dome part 21a.
  • the overall height hi of the dome 21a is 2.05 mm, and the radius of curvature of the dome 21a is 17 mm.
  • the height h2 of the cone 21c is 1.35m m.
  • the outer peripheral portion 21i of the dome portion 21a at the first boundary portion 21b has a curved surface (R) having a radius of curvature of about 0.2 mm.
  • the height h3 of the voice coil fitting portion 21g is 0.4 mm.
  • the height h3 of the voice coil fitting portion is preferably 5% or less of the diameter of the voice coil fitting portion.
  • the diameter of the base of the cone 21c is 16.4 mm.
  • the voice coil fitting portion 21g is formed in a taper shape whose diameter gradually decreases from the lower side to the upper side in the figure.
  • the voice coil 22 is attached to the diaphragm 21 by fitting the outer peripheral surface of the voice coil fitting portion 21g into the winding frame 22a of the voice coil 22 and bonding the same.
  • An adhesive is filled between the outer peripheral surface of the voice coil fitting portion 21g and the outer peripheral surface of the winding frame 22a.
  • the material does not wrinkle or break when the diaphragm 21 is formed by pressurizing a titanium foil material.
  • the sound pressure frequency characteristics of the speaker of the third embodiment are almost the same as the sound pressure frequency characteristics of the second embodiment shown in FIG. 10, and excellent sound pressure frequency characteristics can be obtained. If the difference between the total surface area of the cone 21c and the surface area of the voice coil fitting portion 21g and the surface area of the dome 21a is approximately 15% of the surface area of the dome portion 21a, no large peaks or dips will occur. V ⁇ Sound pressure frequency characteristics can be obtained.
  • diaphragm 21 of the third embodiment has a voice coil fitting portion 21 g, the process of attaching voice coil 22 to diaphragm 21 is easy.
  • a gap is formed between the inner peripheral surface of the winding frame 22a and the outer peripheral surface of the voice coil fitting portion 21g when the voice coil 22 is mounted. If the gap is not filled with the adhesive without a gap, high-frequency sound pressure frequency characteristics may be degraded. If the bonding is performed completely, there is no problem because the winding frame 22a is completely fixed to the diaphragm 21.
  • the present invention can be used for a treble speaker that reproduces a super-treble range.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)

Abstract

L'invention concerne un haut-parleur d'aigus, comprenant un diaphragme métallique de type semi-bombé. Ce haut-parleur est formé par le moulage intégral d'une partie bombée, d'une partie conique, et d'une partie de bord entre elles. Le diaphragme est formé de sorte que le rapport d'une différence entre l'angle de gradient, à la base de la partie bombée, et de l'angle de gradient, à la base de la partie conique, par rapport à l'angle de gradient, à la base de la partie bombée, ou à l'angle de gradient, à la base de la partie conique, selon celle qui s'élargit le plus, est inférieur ou égal à 15 % ; et que le rapport d'une différence entre la surface de la partie bombée et la surface de la partie conique, par rapport à la surface de la partie bombée ou de la surface de la partie conique, selon celle qui s'élargit le plus, est inférieur ou égal à 15 %. L'invention concerne également une partie de fixation de bobine mobile située sous la base de la partie bombée.
PCT/JP2004/016771 2003-11-13 2004-11-11 Haut-parleur d'aigus WO2005048651A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN2004800334562A CN1879447B (zh) 2003-11-13 2004-11-11 高音用扬声器
EP04818500A EP1694092A4 (fr) 2003-11-13 2004-11-11 Haut-parleur d'aigus

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2003383533 2003-11-13
JP2003-383533 2003-11-13

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WO2005048651A1 true WO2005048651A1 (fr) 2005-05-26

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WO (1) WO2005048651A1 (fr)

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Publication number Priority date Publication date Assignee Title
CN101370324B (zh) * 2007-08-17 2012-12-05 陈友余 大动态匀力驱动条形平板扬声器
JP6418556B2 (ja) 2015-12-17 2018-11-07 オンキヨー株式会社 スピーカー用振動板、これを備えたスピーカー、および、スピーカー用振動板の製造方法
CN220711628U (zh) 2022-10-28 2024-04-02 深圳市韶音科技有限公司 一种开放式耳机

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0879884A (ja) * 1994-09-05 1996-03-22 Pioneer Electron Corp 高音再生用スピーカ装置及びその製造方法
JP2002125290A (ja) * 2000-10-18 2002-04-26 Sony Corp スピーカー装置
JP2003199193A (ja) * 2001-12-27 2003-07-11 Pioneer Electronic Corp スピーカ装置
JP2003299191A (ja) * 2002-04-05 2003-10-17 Matsushita Electric Ind Co Ltd スピーカおよびその製造方法

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8603645D0 (en) * 1986-02-14 1986-03-19 Celestion Int Ltd Loudspeakers
JPH0346898A (ja) * 1989-07-14 1991-02-28 Matsushita Electric Ind Co Ltd 動電型スピーカ
US6009182A (en) * 1997-08-29 1999-12-28 Eastern Acoustic Works, Inc. Down-fill speaker for large scale sound reproduction system
JP3930126B2 (ja) * 1997-11-14 2007-06-13 松下電器産業株式会社 スピーカ
JP4557412B2 (ja) * 2000-11-20 2010-10-06 パナソニック株式会社 スピーカ

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0879884A (ja) * 1994-09-05 1996-03-22 Pioneer Electron Corp 高音再生用スピーカ装置及びその製造方法
JP2002125290A (ja) * 2000-10-18 2002-04-26 Sony Corp スピーカー装置
JP2003199193A (ja) * 2001-12-27 2003-07-11 Pioneer Electronic Corp スピーカ装置
JP2003299191A (ja) * 2002-04-05 2003-10-17 Matsushita Electric Ind Co Ltd スピーカおよびその製造方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP1694092A4 *

Also Published As

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CN1879447B (zh) 2010-10-13
CN1879447A (zh) 2006-12-13
EP1694092A1 (fr) 2006-08-23
EP1694092A4 (fr) 2009-12-23

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