WO2019087375A1

WO2019087375A1 - Speaker device

Info

Publication number: WO2019087375A1
Application number: PCT/JP2017/039865
Authority: WO
Inventors: 賢太田中
Original assignee: 東京音響株式会社
Priority date: 2017-11-06
Filing date: 2017-11-06
Publication date: 2019-05-09

Abstract

[Problem] To enable high quality sound reproduction, particularly at low audio frequencies, in a speaker device. [Solution] According to the present invention, a driving magnet 17 is fixed inside a yoke frame 15 having a flange part 15b, and a diaphragm 25 facing the driving magnet is fixed to a distal end section 15c of the flange part 15b. A voice coil 27 is fixed to the diaphragm 25. A both-end lead line 27a of the voice coil 27 is drawn from diagonal positions. A sealed space E is formed by an outer circumferential region 25b of the diaphragm 25 and the flange part 15c. In the flange part 15b, one pair of first communication holes 15f communicating the sealed space E and the outside are formed on an imaginary line passing through the middle between the positions from which the both-end lead line 27a is drawn. A second communication hole is formed in a central portion of the yoke frame 15.

Description

Speaker device

The present invention relates to, for example, a speaker device used for an earphone worn on a user's ear, and more particularly to an improvement of an intra-concha type speaker device having a minimum resonance frequency of 300 Hz or less.

As a speaker apparatus worn on a user's ear, for example, there is a configuration as shown in FIG.

In this configuration, the disk-shaped drive magnet 3 is fixed to the inner bottom portion of the cup-shaped magnetic yoke frame 1 and the disk-shaped pole piece 5 is coaxially fixed on the drive magnet 3. The cylindrical portion 1a of the frame 1 is fitted into the cylindrical portion 7a of the ring plate-like flange portion 7 to be integrated and fixed.

The outer peripheral portion of the thin vibrating membrane 9 is fixed to the outer edge portion of the flange portion 7 so as to face the flange portion 7 and the pole piece 5 at a distance.

Further, a voice coil 11 in which a thin insulated wire is formed in a cylindrical shape is fixed to the central portion of the diaphragm 9 on the yoke frame side, and the voice coil 11 is annularly formed between the pole piece 5 and the cylindrical portion 1 a of the yoke frame 1. The voice coil 11 is inserted into the air gap, and the lead wires 11 a at both ends of the voice coil 11 are led out through the outer peripheral portion of the vibrating membrane 9 and connected to the circuit board 13 disposed on the lower surface of the flange portion 7.

Moreover, the outer peripheral region of the outer periphery of the voice coil 11 in the vibrating membrane 9 and the flange portion 7 form a sealed space.

Reference numeral 7 b in FIG. 10 denotes a plurality of holes formed in the flange portion 7 and communicating with the outside.
Conventionally, in order to adjust the sound quality characteristics of the speaker device, the following two configurations have generally been made.

That is, the first is a configuration in which the acoustic damping material is attached to the opening of the cover (not shown) that covers the back of the speaker, leaving the opening 7b as it is. The second is a configuration in which an acoustic damping material is attached to the opening 7b while the opening of the cover is opened.

It is either to be lowered resonance sharpness of the resonance frequency f ₀ of the speaker device (Q) be common to tone control, does not consider the rolling motion to vibrate in a state where the vibrating membrane 9 is tilted.

In such a speaker device, when an audio signal supplied to the circuit board 13 is applied to the voice coil 11 through the lead wires 11a, the diaphragm 9 is vibrated by the audio signal to generate driving noise.

Although not shown, the speaker device as an actual product is configured as an intraconca type by housing the yoke frame 1 and the flange portion 7 in the main body case, and is surrounded by the user's tragus, antiparallel and concha The main body case is inserted and used in such a manner that the vibrating membrane 9 is brought close to the concha and the concha cavity.

As conventional examples relating to this type of speaker device, there are Japanese Patent Application Laid-Open Nos. 8-172691 (Patent Document 1) and Japanese Patent Application Laid-Open 10-66181 (Patent Document 2).

Unexamined-Japanese-Patent No. 8-172691 (patent document 1) Unexamined-Japanese-Patent No. 10-66181 (patent document 2)

However, in the above-described speaker device, as shown in FIGS. 11A and 11B, the two end lead wires 11a are drawn out from one position P1 near the root of the voice coil 11 in the outer peripheral direction of the diaphragm 9, When a voice signal is applied to the lead wires 11a at both ends to displace and vibrate the voice coil 11, the following effects are likely to occur.

That is, in the configuration described above, the load applied to the vibrating membrane 9 by the both-ends lead wire 11a is concentrated at one position of the leading position P1, and the vibration displacement of the leading position P1 in the vibrating membrane 9 is suppressed. Tends to produce a rolling motion that oscillates in a tilted state.

In addition, it is also general to adopt a configuration in which both end lead wires 11a are drawn toward the flange portion 7 so as to draw an arc from the lead-out position P1 and the both end lead wires 11a are fixed to the vibrating membrane 9 and the flange portion 7 with a flexible adhesive. It is known to. In this configuration as well, the whole of the fixed parts including the lead-out position P1 is subjected to vibrational load, and rolling movement is also likely to occur.

In particular, in a large amplitude state of low-range sound, if large rolling motion of the diaphragm 9 occurs, harmonic distortion increases, so beat sound to the high-range signal is generated, sound turbidity, blurring of the sound image or performance variation Increased, and it was easy for chattering noises to occur.

The beat sound is a sum signal or a difference signal of the high frequency signal and the low frequency harmonic distortion. For example, assuming that the low frequency signal sound is 50 Hz and the high frequency signal sound is 2000 Hz, ... 1850, 1900, These are addition and subtraction signals such as 1950, 2050, 2100, 2150 Hz and so on.

Furthermore, the rolling movement worsens the ability to follow sharp sounds such as percussions, and the faithful reproduction of reproduced sound is also easily deteriorated.

However, in the configuration of FIG. 10 described above, since the flange portion 7 and the outer peripheral region of the outer periphery from the vicinity of the root of the voice coil 11 in the vibrating membrane 9 form a sealed space, In addition, it may be considered that rolling motion is unlikely to occur in the vibrating membrane 9.

However, the flange portion 7 is formed with a plurality of openings 7b, and the positional relationship between the lead portions of the lead wires 11a and the openings 7b is not particularly defined.

Therefore, in the configuration described above, air flow occurs through the opening 7b, and the expected air damper effect is not obtained, and a large load is applied to the vibrating membrane 9 at one point of the lead position P1 of the lead wires 11a. Since it is possible to suppress the vibration displacement of the lead-out position P1, it is difficult to suppress the occurrence of the rolling motion.

By the way, although it is conceivable to make the shape of the vibrating membrane 9 a shape which is not easily influenced by the rolling motion, it is not necessarily advantageous in terms of sound quality and input resistance.

Specifically, there is also a proposal to suppress the occurrence of rolling motion by increasing the rigidity of the vibrating membrane 9 itself by using the vibrating membrane 9 in which the unevenness is increased or the corrugation groove is deepened or the thick vibrating membrane 9 is used. .

However, in the vibrating film 9 having such a shape, there is a problem that the resonance frequency f ₀ is high and it is difficult to output the bass.

On the other hand, in the case of a flexible vibrating film 9 that absorbs rolling motion by reducing unevenness and making the groove of the corrugation shallow, there are problems such as large distortion in the low region.

As described above, it has been found that there is room for improvement in the conventional speaker device in order to obtain high-quality reproduced sound in a wide frequency band, particularly in a low frequency range.

In recent years, in the speaker device and the earphone device, as market demands for sound quality improvement such as high resolution increase, higher performance is required.

Therefore, as a result of intensive investigations of various configurations by the present inventor in pursuit of further high quality, the positional relationship between the lead portion of the both-ends lead wire 11a and the braking opening 7b which has not been paid much attention conventionally Attention was focused on the point that their positional relationship affects the characteristics to find a new configuration and complete the present invention.

The present invention has been made to solve such problems, and has a wide frequency band and excellent transient response characteristics in an intra-concha type speaker device having a lowest resonance frequency of 300 Hz or less as the device, in particular, a bass region. It is an object of the present invention to provide a speaker device capable of reproducing high quality sound.

In order to solve such a problem, a first configuration according to the speaker device of the present invention is a yoke frame formed in a cup shape, and the open tip end side is extended toward the outer periphery and the outer diameter A magnetic yoke frame having an annular flange portion in the range of 12 mm to 20 mm, and a cylindrical drive magnet coaxially fixed to the bottom of the yoke frame with one end face in the yoke frame; A ring-shaped pole piece coaxially superimposed on the other end face of the drive magnet in the yoke frame, and a flange so as to face and close the pole piece and the flange portion at a distance A thin vibrating membrane fixed to the outer periphery of the part and a thin insulated wire are wound to form a cylinder, and the central area is surrounded on one surface of the vibrating membrane on the yoke frame side A voice coil fixed to the diaphragm, which is inserted into an annular gap between the outer periphery of the pole piece and the cylindrical portion of the yoke frame, and the vibration due to an audio signal applied to the lead wires at both ends And a voice coil for vibrating the membrane.

Moreover, the outer peripheral region of the voice coil from the vicinity of the root to the outer periphery of the vibrating membrane faces the flange portion to form a sealed space with it, and the lead wires at both ends are derived from diagonal positions at the root of the voice coil, It is a first communication hole which is formed one pair each in the flange part on the orthogonal imaginary line orthogonal to the center of the imaginary line connecting the lead-out positions of the both end leads and communicates the sealed space to the outside A first communication hole for adjusting the acoustic impedance of the sealed space, and a second communication hole for communicating the inside of the yoke frame to the outside through the respective center portions of the yoke frame, the drive magnet and the pole piece. And has a second communication hole for adjusting the acoustic impedance of the sealed space, and the lowest resonance frequency is selected to be 300 Hz or less

According to a second configuration of the speaker device of the present invention, one end face is coaxial with a cylindrical magnetic yoke frame and a fixed portion formed by bending from one end face side of the yoke frame to the outside. A drive magnet having a fixed ring plate shape, which is circumferentially opposed to the outer periphery of the cylindrical portion of the yoke frame, and the other end face side of the drive magnet on the outer periphery of the yoke frame An axially fixed ring-shaped pole piece having a tip extending to the outer periphery than the magnet, and a pole for facing and closing the yoke frame and the pole piece at a distance A thin diaphragm fixed to the tip of the piece and a thin insulated wire are wound to form a cylinder, and the center of the diaphragm on the yoke frame side is formed. A voice coil fixed to the vibrating membrane so as to surround the area, which is inserted into an annular gap between the outer periphery of the yoke frame and the inner periphery of the pole piece, and And a voice coil for vibrating the vibrating membrane.

In addition, the outer diameter of the fixed portion of the yoke frame is in the range of 12 mm to 20 mm, and the outer peripheral region of the vibrating film from near the base of the voice coil to the outer periphery mainly forms a sealed space between this and the pole piece The lead wires at both ends are derived from the diagonal position at the root of the voice coil, and each one of the flanges on the orthogonal imaginary line orthogonal to the center of the imaginary line connecting the lead positions of the lead wires A first communication hole formed in a pair to communicate the sealed space to the outside, the first communicating hole for adjusting the acoustic impedance of the sealed space and the outside through the hollow portion of the yoke frame A second communication hole, which has a second communication hole for adjusting the acoustic impedance of the sealed space, and the lowest resonance frequency is selected to be 300 Hz or less.

In the first and second configurations described above, the pair of first communication holes are each selected to have an inner diameter of 0.35 mm to 1.5 mm, and the second communication holes have an inner diameter of 0.8 mm to 2.5 mm. Configurations selected for are also possible.

In the first and second configurations, a configuration is also possible in which a pair of the first communication holes are closed with an acoustic resistance material.

In the first and second configurations, a configuration is also possible in which the lead wires at both ends are led out in opposite directions along the vibrating membrane and then led out via the second communication hole.

In the first and second configurations, a configuration is also possible in which the both-ends lead wires are derived in mutually opposite directions along the vibrating film and are derived from the outer peripheral direction of the vibrating film.

In the first configuration according to the speaker device of the present invention, the lead wires at both ends are derived from the diagonal positions at the root of the voice coil, and are orthogonal to a virtual line connecting the lead positions of the lead wires. The inside of the yoke frame is made via the first communication holes for adjusting the acoustic impedance, one pair each being formed in the flange portion on the imaginary imaginary line, and the respective center portions of the yoke frame, the drive magnet and the pole piece. And a second communication hole for adjusting the acoustic impedance that communicates with the outside.

Therefore, in the configuration of the inner magnet type in which the lowest resonance frequency is selected to be 300 Hz or less, a practical degree of sealing of the sealed space is secured, and the vibrating film is uniform near the lead position of the both lead wires from the voice coil. Vibration is secured.

Moreover, the rolling motion of the vibrating membrane is prevented, and the smooth piston motion motion of the vibrating membrane is ensured, and as a result, it is possible to obtain excellent transient response, low distortion, and a wide frequency band. In particular, high quality sound reproduction becomes possible in the low frequency range.

In the second configuration of the speaker device according to the present invention, the lead wires at both ends are derived from diagonal positions at the root of the voice coil, and orthogonal virtual lines orthogonal to imaginary lines connecting lead positions of the lead wires. A first communication hole for adjusting the acoustic impedance formed in a pair on the pole piece, and a second communication hole for adjusting the acoustic impedance that communicates with the outside through the hollow portion of the yoke frame. And.

Therefore, in the configuration of the external magnet type in which the lowest resonance frequency is selected to be 300 Hz or less, the degree of practical sealing of the sealed space is secured, and the diaphragm uniform around the lead position of the both lead wires from the voice coil Vibration is secured, and it is possible to obtain the same effect as the internal magnet type configuration.

In the first and second configurations described above, the inner diameter of each of the pair of first communication holes is selected to be 0.35 mm to 1.5 mm, and the inner diameter of the second communication hole is 0.8 mm to 2.5 mm If selected, it is sure that the above-described effects can be obtained in speaker devices of various sizes.

In the first and second configurations, if a pair of the first communication holes is closed with an acoustic resistance material, it is easy to obtain a desired acoustic impedance without reducing the inner diameter of the first communication holes. easy.

In the first and second configurations, if the lead wires on both ends are led out in opposite directions along the vibrating membrane and then led out through the second communication hole, the occurrence of rolling motion is further suppressed. Is possible.

In the first and second configurations, it is possible to further suppress the occurrence of rolling motion if the both-ends lead wires are derived in mutually opposite directions along the vibrating film and are derived from the outer peripheral direction of the vibrating film .

It is a principal part longitudinal cross-sectional view which shows one form of the 1st structure which concerns on the speaker apparatus of this invention. It is the principal part front view and principal part sectional view which concern on the speaker apparatus of FIG. It is a schematic longitudinal cross-sectional view shown in the state which manufactured the speaker apparatus of this invention. It is a frequency characteristic figure about the speaker apparatus of FIG. 1, and the conventional speaker apparatus. It is a total harmonic distortion characteristic view about the speaker apparatus of FIG. 1, and the conventional speaker apparatus. It is a transient response waveform figure which concerns on the speaker apparatus of FIG. 1, and the speaker apparatus of this invention. It is a figure explaining the derivation | leading-out structure of the both-ends lead wire of the voice coil in the speaker apparatus of this invention. It is a principal part longitudinal cross-sectional view which shows the 2nd structure of the speaker apparatus of this invention. It is a principal part schematic plan view which concerns on the 2nd structure of the speaker apparatus of this invention. It is a schematic sectional drawing which shows the conventional speaker apparatus. It is the schematic explaining the operation | movement of the conventional speaker apparatus and the speaker apparatus of this invention.

Hereinafter, an embodiment of a speaker device according to the present invention will be described by taking an earphone device as an example and referring to the drawings.
FIG. 1 is an essential part longitudinal sectional view showing an embodiment of a first configuration according to the speaker device of the present invention.

In FIG. 1, the yoke frame 15 is formed into a cup shape from a magnetic plate material, and a ring plate shape formed by bending the open end side (upper side in FIG. 1) of the cylindrical portion 15a outward. The flange portion 15b is integrally formed, and the outer peripheral portion 15c of the flange portion 15b is bent so as to slightly rise upward in the figure. The outer periphery of the flange portion 15b, that is, the outer diameter (S) of the yoke frame 15 is selected to be, for example, about 12 mm to 20 mm.

A through hole 15e is formed in the center of the bottom 15d of the yoke frame 15, and a cylindrical (ring) drive magnet 17 is accommodated in the yoke frame 15 so that the hollow portion 17a is aligned with the through hole 15e. There is. That is, the drive magnet 17 is housed in the yoke frame 15 with one end face (lower side in FIG. 1) overlapping the bottom portion 15 d so as to surround the through hole 15 a.

A ring-shaped pole piece formed on the other end face (upper side in FIG. 1) of the drive magnet 17 having an outer diameter equal to or slightly larger than the outer diameter of the drive magnet 17 and made of a magnetic material 19 is piled up. The pole piece 19 has a hollow portion 19 a aligned with the hollow portion 17 a of the drive magnet 17.

A circuit board 21 having a through hole 21a is overlapped on the outside of the bottom portion 15d of the yoke frame 15 so that the through hole 21a is aligned with the through hole 15e.

The yoke frame 15, the drive magnet 17, the pole piece 19 and the circuit board 21 have both ends of the tubular bolt 23 penetrated from the pole piece 19 or the circuit board 21 side to the hollow portions 17a, 19a and the through holes 15e, 21a. It is coaxially integrated by caulking. The hollow portion 23a of the hammer 23 has an inner diameter (S2) of about 0.8 mm to 2.5 mm.

The yoke frame 15, the drive magnet 17, the pole piece 19, and the circuit board 21 may be coaxially integrated and fixed by an adhesive (not shown) or the like. In this configuration, the hollow portions 17a and 19a and the through holes 15e and 21a have the same inner diameter (S2) as the hollow portion 23a.

The outer periphery of the pole piece 19 circumferentially faces the tip end of the cylindrical portion 15a of the yoke frame 15, that is, at the same level position as the bent portion from the cylindrical portion 15a to the flange portion 15b.

A magnetic circuit is formed by the magnetic flux generated from the drive magnet 17 between the outer periphery of the pole piece 19 and the end of the cylindrical portion 15a of the yoke frame 15 opposed to the outer periphery of the pole piece 19 with a slight space therebetween.

As shown in FIGS. 2A and 2B, the vibrating film 25 is formed in a disk shape from a conventionally known thin and translucent insulating film material, and a central region formed by slightly expanding a relatively wide central portion in a dome shape. 25a and an outer peripheral area 25b concentrically and annularly surrounding the central area 25a. FIG. 2A is shown in a state in which the pole piece 19, the flange portion 15 b and the voice coil 27 described later can be seen through the translucent vibrating membrane 25.

Although not shown, there may be a case where a radial fine uneven line called a so-called corrugation edge is formed in the outer peripheral area 25 b of the vibrating membrane 25.

The vibrating film 25 has a space for covering the flange portion 15b of the yoke frame 15 and the pole piece 19 as shown in FIG. 1, and covers the entire outer periphery of the outer peripheral region 25b as the outer peripheral portion 15c of the flange portion 15a. Is fixed by an adhesive or the like, and supported by the outer peripheral portion 15c.

The voice coil 27 is formed by cylindrically winding a thin insulated wire covered with an insulating coating at an annular boundary between the central region 25a and the outer peripheral region 25b on one surface side (lower surface side in FIG. 1) of the vibrating film 25. One end face side is fixed so as to surround the central region 25a (see FIG. 2).

The voice coil 27 slightly spaces the yoke frame 15 from the drive magnet 17 and the pole piece 19 with respect to the annular gap between the inner wall of the cylindrical portion 15 a of the yoke frame 15 and the outer periphery of the drive magnet 17 and the pole piece 19. , And are annularly opposed to the inner periphery of the yoke frame 15 and the outer periphery of the drive magnet 17 respectively.

The two end leads 27a extending from the voice coil 27 are drawn inward from diagonal positions P1 and P2 at the root of the voice coil 27, as shown in FIG. 2A, and as shown in FIG. It is led to the outside through the hollow portion 23a of the above, that is, the hollow portions 19a and 17a of the pole piece 19 and the drive magnet 17, the bottom portion 15d of the yoke frame 15, and the through holes 15e and 21a of the circuit board 21 and connected to the circuit board 21. ing.

The lead wires 27a at both ends are wired in the air with a margin not to be stressed even by the vibration of the vibrating film 25. That is, the lead wires 27a at both ends do not contact other than the lead points P1 and P2 and the bolt 23.

The two end lead wires 27b are led out from the diagonal position at the base of the voice coil 27 as shown by the broken line in FIG. 2A, and the vibrating film 25 is formed at the outer peripheral portion 15c of the flange portion 15b. A configuration is also possible in which it is derived outside from the

As shown in FIG. 1, the outer peripheral area 25b of the vibrating membrane 25 is in the yoke frame 15, forms a sealed space E with the flange portion 15b, and faces the sealed space E.

The sealed space E is a narrow annular gap between the voice coil 27 and the drive magnet 17 and the pole piece 19 from the narrow gap between the cylindrical portion 15 a of the yoke frame 15 and the voice coil 27, and the hollow portion of the bolt 23. It is communicated with the outside through 23a and sealed indirectly.

Therefore, the sealed space E has an air damper function to support the entire outer peripheral area 25b of the vibrating membrane 25 with uniform load.

In the flange portion 15b of the yoke frame 15, two first communication holes 15f communicating with the outside from the sealed space E are formed at two diagonal positions. The inner diameter (S1) of the first communication hole 15f is selected to be, for example, 0.35 mm to 1.5 mm.

As shown in FIG. 2A, each first communication hole 15f is a flange on an orthogonal imaginary line Y orthogonal to the imaginary line X at the center Z of the imaginary line X connecting the lead positions P1 and P2 of the lead wires 27a. A pair is formed one by one in the portion 15b. That is, in the flange portion 15b, the first communication holes 15f are formed in a pair at positions farthest from the lead-out positions P1 and P2.

Each first communication hole 15 f is a member for adjusting the acoustic impedance of the sealed space E, and in the vicinity thereof, the acoustic impedance of the sealed space E is reduced, and particularly the low region without suppressing the vibration of the vibrating membrane 25. Have a function to facilitate the vibration of the

An audio signal is supplied from an electronic device (not shown) to the circuit board 21 superimposed on the bottom portion 15 d of the yoke frame 15 by a cable 29 described later.

The voice coil 27 is displaced by the application of the voice signal to the voice coil 27 via the both-ends lead wire 27a, and the vibrating membrane 25 is driven to vibrate.

That is, as shown in FIG. 1, the drive unit 31 for vibrating and driving the vibrating film 25 is formed by the yoke frame 15, the drive magnet 17, and the voice coil 27, and becomes a main part of a so-called internal magnet type speaker device. .

The hollow portion 23a of the bolt 23 is a second communication hole which indirectly makes the sealed space E communicate with the outside similarly to the first communication hole 15f described above, and a member for adjusting the acoustic impedance of the sealed space E While having a function as, it has an action to lower the acoustic impedance to the vibration of the central region 25a of the vibrating film 25 and to facilitate the vibration. In addition, as described above, the hollow portion 23a (second communication hole) has an inner diameter (S2) selected to be, for example, 0.8 mm to 2.5 mm.

And the speaker apparatus mentioned above is comprised so that the minimum resonant frequency may be 300 Hz or less by adjusting the shape and dimension of the component which were mentioned above.

Next, a configuration in which the above-described speaker device is commercialized will be described.
As shown in FIG. 3, in the yoke frame 15, the outer peripheral portion 15c of the flange portion 15b is fitted in the cap portion 33, and the cup-shaped case main body 35 is fitted in the cap portion 33 from below the flange portion 15b. Are housed and supported in the case main body 35 so as to be sandwiched between the cap portion 33 and the case main body 35.

In the cap portion 33, a plurality of sound through holes 33a for transmitting the driving sound due to the vibration of the vibrating membrane 9 to the outside are formed in a penetrating manner, and the cable 29 is inserted into the case main body 35 from the outside. It is connected to the.

The cap portion 33 and the case main body 35 are both molded from a synthetic resin, and integrated by fitting them together to be commercialized as an earphone device.

In such a speaker device, by applying an audio signal from the cable 29 to the voice coil 27 through the circuit board 21, the drive unit 31 causes the diaphragm 25 to vibrate and the vibration sound is transmitted to the outside from the sound through hole 33a. It is propagated.

In such a configuration according to the speaker device of the present invention, the lead-out positions P1 and P2 of the lead wires 27a at both ends of the voice coil 27 are at two diagonal positions, and compared to the configuration in which they are one position. It is possible to disperse the load on 25 and to suppress the occurrence of rolling motion in the vibrating membrane 25.

Moreover, if the openings are not provided near the lead-out positions P1 and P2, the acoustic impedance near the lead-out positions P1 and P2 becomes high, and a line connecting the lead-out positions P1 and P2 of the lead wires 27a to the vibrating membrane 25 It is also possible to suppress seesaw-like motion with a linear fulcrum (node).

However, in the configuration in which the first communication hole 15f is not formed in the flange portion 15b, the acoustic impedance at this position is high, and the seesaw motion as described above is suppressed, but the resonance sharpness of the resonance frequency f ₀ of the speaker device ( Q) drops, and sufficient low-pass reproduction can not be obtained.

In this point, in the configuration according to the speaker device of the present invention, in the flange portion 15b, as shown in FIG. 2, the first communication in the positional relationship farthest from the lead positions P1 and P2 of the lead wires 27a of both ends Since the holes 15 f are formed in a pair, the vibration of the vibrating film 25 can be easily ensured up to the low region, and it is possible to obtain a desired good low region characteristic.

That is, in the speaker device according to the present invention, by forming the first communication hole 15f, the resonance sharpness (Q) of the resonance frequency f ₀ can be maintained at an appropriate value, and sufficient low frequency sound can be reproduced. In addition, it is possible to reduce rolling motion, seesaw motion, and the like by selecting the first communication holes 15 f to have appropriate dimensions and placing them in a positional relationship farthest from the lead-out positions P 1 and P 2.

With such operation combined, in the speaker device according to the present invention, as shown in FIG. 11C, the entire vibrating membrane 25 is displaced in a smooth piston mode, and a wide frequency band, an excellent transient response waveform, particularly high in a low band It is possible to obtain quality reproduced sound. Specifically, the sense of localization of a musical instrument or the like is improved, and the reproduced sound can be easily determined.

On the other hand, in the conventional speaker device shown in FIG. 10, when it is intended to improve the low frequency response, it is necessary to increase the vibration amplitude of the vibrating film 25 and the rolling motion becomes larger, distortion increases and chatter noise Abnormal vibration such as the occurrence of

In the conventional speaker device shown in FIG. 10, as shown in FIG. 11A, the vibrating membrane 7 is likely to cause an operation called rolling motion due to the load of the lead wires 9a. Was being done. Therefore, in order to absorb the distortion during vibration of the vibrating film 7 to a certain extent, it is general to make the portion corresponding to the central region 7a into a spherical shape so as to bend and vibrate to some extent.

On the other hand, in the configuration of the present invention, since rolling motion is hard to occur, distortion such as twisting is hard to occur also in the outer peripheral region 25b, and the design freedom of the corrugation edge portion is far Can be improved. Moreover, since the generation of distortion and chattering noise is small in the driving sound, the response in the low band can be controlled relatively freely.

FIG. 4 is a frequency characteristic diagram showing the speaker apparatus of the configuration according to the present invention of FIG. 1 and the conventional configuration of FIG. 10, and FIG. 5 shows the speaker device of the configuration according to the present invention of FIG. It is a distortion rate characteristic view.

In the configuration according to the speaker device of the present invention, like the full harmonic distortion characteristics shown by the solid line a in FIG. 4, good sound pressure characteristics are exhibited particularly to a low sound range, and high quality sound reproduction is possible in a wide frequency band. It can be seen that there is a certain level, and the harmonic distortion characteristic is low and flat up to the low range, as in the total harmonic distortion characteristic indicated by the solid line a in FIG.

On the other hand, in the conventional configuration shown in FIG. 10, the sound pressure characteristics in a low sound range tend to deteriorate like the frequency characteristics shown by the broken line b in FIG. As described above, the harmonic distortion characteristic is bad, and particularly the deterioration of the bass region of around 100 Hz or less is remarkable.

Furthermore, the transient response waveform shown by the configuration of the speaker apparatus according to the present invention is as shown in FIG. 6A, and there is little disturbance of the output signal waveform when a 3 KHz tone burst signal is applied, and the transient response waveform is good. I understand.

On the other hand, in the configuration of FIG. 10, as shown in FIG. 6B, it can be seen that a relatively large disturbance occurs in the output signal waveform when the 3 KHz tone burst signal is applied.

In this test, although the input signal is conducted with three waves, compared to FIG. 6A, the signal rising speed is slower, and it can be understood that the vibration is difficult to stand up (black part) even after the signal is blocked. .

As described above, in the first configuration according to the speaker device of the present invention, particularly in the intra-concha type speaker device having the lowest resonance frequency of 300 Hz or less as the device, the frequency characteristics in a wide frequency band, particularly the mid-bass frequency band And, it has excellent transient response characteristics, and high-quality sound reproduction is possible especially in the low-pitch range.

Moreover, in the intra-concha type earphone device, when the thickness of the flange portion 5b is 0.6 mm or less, in order to adjust the acoustic impedance only by the opening, the first communication hole 15f formed in the flange portion 15b is It is preferable to set the inner diameter to 0.35 mm to 0.8 mm according to the target frequency characteristics and acoustic characteristics.

However, if it is difficult to form a small aperture from the viewpoint of manufacture, the first communication hole 15f is formed in the range of 0.8 mm to 1.5 mm, and a damping member is attached to the aperture to make an acoustic A configuration for adjusting the impedance is also possible.

Further, the inner diameter (S2) of the second communication hole (hollow portion) 23a can be selected to be 0.8 mm to 2.5 mm in accordance with the easiness of manufacture and the desired frequency characteristics and acoustic characteristics.

Further, in the intra-concha type earphone device, the outer diameter (S) of the yoke frame 15 can be selected in the range of 12 mm to 20 mm in accordance with the ease of manufacture and the desired frequency characteristics and acoustic characteristics.

In the first configuration of the present invention, the lead-out directions of the two end lead wires 27a are not limited to FIG. 2 described above, and for example, the configurations shown in FIGS. 7A to 7C are also possible. The same applies to the following embodiments.

FIG. 7A shows a configuration in which both lead wires 27a are led out in mutually opposite directions along the film surface of the vibrating film 25 and then through the hollow portion 23a, and FIG. 7B is a film surface of the vibrating film 25. The structure shown in FIG. 6C is derived in the opposite direction from each other along the film surface of the vibrating film 25 and the vibrating film 25 is also derived in the same direction after being drawn out in the same direction. It is the structure derived | led-out from the outer periphery direction of.

In either configuration, the lead wires 27a at both ends are wired in the air with a margin not to be stressed even by the vibration of the vibrating film 25.

In particular, in the configuration in which the lead wires 27a are drawn in opposite directions along the film surface of the vibrating film 25 as shown in FIGS. 7A and 7C, the load on the vibrating film 25 is applied in the rotational direction, thereby further suppressing the rolling motion. It is possible. The same applies to the following configurations.

Next, a second configuration according to the speaker device of the present invention, that is, an external magnet type speaker device will be described.

FIG. 8 is a longitudinal sectional view of an essential part showing an embodiment of the second configuration according to the speaker device of the present invention.
In FIG. 8, the yoke frame 37 is formed into a cylindrical shape from a magnetic plate material, and a ring plate-like fixing portion 37a formed by bending the open end on the lower side in the figure to the outside is integrated. Have to.

A ring-shaped drive magnet 39 is coaxially fitted on the outer periphery of the yoke frame 37 at a distance from the outer periphery of the cylindrical portion 37b, and one end face (lower side in FIG. 8) is fixed to the fixing portion 37a. ing.

On the other end face (upper side in FIG. 8) of the drive magnet 39, a pole piece 41 formed in a ring plate shape from a magnetic body with an inner diameter approximately the same size as or slightly smaller than the inner diameter of the drive magnet 39 is superimposed. ing.

The outer peripheral tip end 41a of the pole piece 41 is bent slightly upward (upper side in FIG. 8). The outer diameter (S) of the pole piece 41 (tip 41a) is selected to be, for example, 12 mm to 20 mm.

The drive magnet 39 and the pole piece 41 have the same outer circumference, and the inner circumference of the pole piece 41 is substantially the same as that of the drive magnet 39 projecting inward. The pole piece 41 faces the other end of the yoke frame 37 at substantially the same level position.

A circuit board 43 having a through hole 43a with an inner diameter (S2) of 0.8 mm to 2.5 mm is superimposed on the outer side of the fixing portion 37a of the yoke frame 37. The through hole 43a has the same function as that of the second communication hole (the second hollow portion 23a) described above.

The fixing portion 37a of the yoke frame 37, the drive magnet 39, the pole piece 41, and the circuit board 43 are coaxially integrated by, for example, an adhesive and fixed to the fixing portion 37a of the yoke frame 37.

A magnetic circuit is formed by the magnetic flux from the drive magnet 39 between the inner periphery of the pole piece 41 and the end of the yoke frame 37 opposed to the inner periphery of the pole piece 41 with a slight distance therefrom.

Similar to FIG. 2, the vibrating membrane 45 is formed in a disk shape from a conventionally known thin insulating film material, and has a central region 45a formed by slightly expanding a relatively wide central portion into a dome shape, and the central region And an outer peripheral region 45b concentrically and annularly surrounding 45a. The other configuration of the vibrating membrane 45 is the same as that of the vibrating membrane 25 of FIG.

The vibrating membrane 45 has a space for the yoke frame 37 and the pole piece 41 to cover them, and the entire outer periphery of the outer peripheral area 45 b is fixed to the tip 41 a of the pole piece 41 with an adhesive or the like It is done.

On one side (the lower surface side in FIG. 8) of the vibrating membrane 45, at the annular boundary between the central region 45a and the outer peripheral region 45b, as in the voice coil 27 described above, One end face side of the voice coil 47 wound and integrated into a shape is fixed so as to surround the central region 45a.

The voice coil 47 is inserted into the annular gap between the outer wall of the yoke frame 37 and the inner periphery of the drive magnet 39 and the pole piece 41 at a slight distance from the yoke frame 37, the drive magnet 39 and the pole piece 41, The outer periphery of the yoke frame 37 and the inner periphery of the drive magnet 39 and the pole piece 41 are annularly opposed.

The lead wires 47a at both ends of the voice coil 47 are derived from two diagonal positions as shown in FIG. 9 and penetrate the through holes 43a of the circuit board 43 through the hollow portion of the yoke frame 37, and the circuit board Connected to the 43. FIG. 9 is schematically illustrated.

From around the base of the voice coil 47 to the outer peripheral area 45 b faces a sealed space E formed between the pole piece 41 and the outer peripheral area 45 b as shown in FIG. 8.

The sealed space E communicates with the outside from the narrow gap between the pole piece 41 or the drive magnet 39 and the voice coil 47 through the hollow portion of the yoke frame 37 and the through portion 43a of the circuit board 43 and is indirectly sealed. It has a function of supporting the entire outer peripheral area 45b of the voice coil 47 with uniform load.

In the pole piece 41, as shown in FIG. 9, the first communication hole 41b is 1 on the orthogonal virtual line Y orthogonal to the center Z of the virtual line X connecting between the lead positions P1 and P2 of the lead wires 47a. A pair is formed penetrating one by one. The inner diameter (S1) of the first communication hole 41b is selected to be, for example, 0.35 mm to 1.5 mm, as in FIG.

An audio signal is supplied from an electronic device (not shown) to the circuit board 43 overlapped with the fixing portion 37a of the yoke frame 37 by a cable (not shown).

The voice coil 47 is displaced by the application of the voice signal to the voice coil 47 via the lead wires 47a at both ends, and the diaphragm 45 vibrates.

That is, as shown in FIG. 8, the yoke frame 37, the drive magnet 39 and the voice coil 47 form a drive unit 49 for vibrating the diaphragm 45, which is a main part of a so-called external magnet type speaker device .

The yoke frame 37 is fitted in the cap-like case main body 35 and supported in the case main body 35 as shown in FIG. 3 described above, and thus the illustration and description thereof will be omitted. The product production example and usage example of the earphone device are the same, and therefore, the description and illustration thereof will be omitted.

The sealed space E in the second configuration of the present invention is formed between the pole piece 41 and the outer peripheral region 45 b of the vibrating membrane 45 and faces this, and functions to support the load of the outer peripheral region 45 b of the vibrating membrane 45 Is the same as the first configuration as long as it has

Moreover, the second configuration according to the present invention is the same as the first configuration in its operation and effects, and the frequency characteristics and the total harmonic distortion characteristics are as shown in FIG. 4 and FIG. It has a transient response characteristic, and high-quality sound reproduction is possible especially in the low-pitch range.

In the second configuration according to the present invention, the first communication hole is formed with an outer diameter (S) of the pole piece 41 (tip portion 41a) in the range of 12 mm to 20 mm according to the ease of manufacture and the intended characteristics. The inner diameter (S1) of 41b can be selected in the range of 0.35 mm to 1.5 mm, and the inner diameter (S2) of the second communication hole (through hole) 43a can be selected in the range of 0.8 mm to 2.5 mm. It is the same as the first configuration described above.

In the first and second configurations described above, although not shown, when the inner diameter of the first communication holes 15f and 41a is small and it is difficult to form a through hole, the inner diameter is made larger and air permeability is increased. It is the same as the first configuration that the sheet-like acoustic resistance material having the same is used to close them, to obtain an equivalent acoustic resistance and to change the acoustic impedance.

1, 15, 37 Yoke frame 1a, 15a, 37b Cylindrical part 3, 17, 39 Drive magnet 5, 19, 41 Pole piece 7, 15b Flange part 7a Cylindrical

part 7b Opening

9, 25, 45 Vibrating film 11, 27 , 47

voice coil

11a, 27a, 27b, 47a both end lead wire 15c outer peripheral portion 15d bottom portion 15e, 21a through

hole

15f, 41b first communication hole 17a, 19a hollow portion 21, 43 circuit board 23 snap 23a hollow portion 2 communication holes)
25a, 45a Central region 25b, 45b Outer peripheral region 29

Cable

31, 49 Drive unit 33 Cap 33a Sound passage hole 35 Case main body 37a Fixing portion 41a Tip 43a Through hole (second communication hole)
E Sealed space P1, P2 Derivation position S, S1, S2 Dimensions

Claims

A yoke frame formed in a cup shape, the magnetic yoke frame having an annular flange portion having an open tip end side extending toward the outer periphery and having an outer diameter in a range of 12 mm to 20 mm;
A cylindrical drive magnet coaxially fixed to the bottom of the yoke frame with one end face in the yoke frame;
A ring-shaped pole piece coaxially superimposed on the other end face of the drive magnet in the yoke frame;
A thin vibrating membrane fixed to an outer peripheral portion of the flange portion so as to face and close the pole piece and the flange portion at a distance;
A voice coil which is formed into a tubular shape by winding a thin insulated wire, and is fixed to the vibrating membrane so as to surround a central region on one surface of the vibrating membrane on the yoke frame side, the pole piece outer circumference and the yoke frame A voice coil which is inserted into an annular gap between the shape part and vibrates the vibrating membrane by an audio signal applied to the both-ends lead wire;
Equipped with
The outer peripheral area of the voice coil in the vibrating membrane from the vicinity to the outer periphery faces the flange portion to form a sealed space with it, and the lead wires at both ends are derived from diagonal positions at the root of the voice coil It is a first communication hole formed one by one in the flange portion on an orthogonal imaginary line orthogonal to the center of an imaginary line connecting lead-out positions of both end leads, and communicating the sealed space with the outside A second communication hole for communicating the inside of the yoke frame to the outside through a first communication hole for adjusting the acoustic impedance of the sealed space, the yoke frame, the drive magnet, and a central portion of each of the pole pieces; A second communication hole for adjusting the acoustic impedance of the sealed space, and the lowest resonance frequency is selected to be 300 Hz or less Speaker and wherein the door.
The speaker device according to claim 1, wherein the pair of first communication holes are each selected to have an inner diameter of 0.35 mm to 1.5 mm, and the second communication holes are selected to have an inner diameter of 0.8 mm to 2.5 mm. .
The speaker apparatus according to claim 2, wherein the pair of first communication holes are closed by an acoustic resistance material.
3. The speaker device according to claim 1, wherein the lead wires at both ends are led out in mutually opposite directions along the vibrating membrane and then led out via the second communication hole.
3. The speaker device according to claim 1, wherein the lead wires at both ends are led out in mutually opposite directions along the vibrating membrane and are led out from an outer peripheral direction of the vibrating membrane.
A cylindrical magnetic yoke frame,
A ring plate-shaped drive magnet in which one end face is coaxially fixed to a fixed portion bent outward from one end face side of the yoke frame, the outer periphery of the yoke frame and the interval Drive magnet which is placed and faces circumferentially
A ring-shaped pole piece coaxially fixed to the other end face side of the drive magnet on the outer periphery of the yoke frame, the pole piece having a tip portion protruding toward the outer periphery than the magnet;
A thin diaphragm fixed to the tip of the pole piece so as to face and close the yoke frame and the pole piece at a distance;
A voice coil which is formed into a cylindrical shape by winding a thin insulated wire, and is fixed to the vibrating membrane so as to surround a central region on one surface of the vibrating membrane on the yoke frame side, the yoke frame outer periphery and the pole piece inner periphery A voice coil which is inserted into the annular gap between them and which vibrates the vibrating membrane by an audio signal applied to the both-ends lead wire;
Equipped with
The outer diameter of the fixed portion of the yoke frame is in the range of 12 mm to 20 mm, and the outer peripheral region of the vibrating membrane from near the base of the voice coil to the outer periphery mainly forms a sealed space between it and the pole piece The lead wires at both ends of the voice coil are derived from diagonal positions at the root of the voice coil, and one each on the flange portion on an orthogonal imaginary line orthogonal to the center of an imaginary line connecting between the lead positions of the lead wires A first communication hole formed in a pair to communicate the sealed space to the outside, the first communication hole for adjusting the acoustic impedance of the sealed space and the outside through the hollow portion of the yoke frame The second communication hole for adjusting the acoustic impedance of the sealed space, and the lowest resonance frequency is selected to be 300 Hz or less Speaker and wherein the door.
The speaker device according to claim 6, wherein the pair of first communication holes are each selected to have an inner diameter of 0.35 mm to 1.5 mm, and the second communication holes are selected to have an inner diameter of 0.8 mm to 2.5 mm. .
The speaker apparatus according to claim 7, wherein the pair of first communication holes are closed by an acoustic resistance material.
8. The speaker device according to claim 6, wherein the lead wires at both ends are led out in opposite directions along the vibrating membrane and then led out via the second communication hole.
8. The speaker device according to claim 6, wherein the lead wires at both ends are respectively drawn in opposite directions along the vibrating membrane and are drawn from an outer peripheral direction of the vibrating membrane.