JP2012182629A - Speaker device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate sound quality adjustment and manufacture and prevent damage from vibration and shock during transportation.SOLUTION: In a speaker device in which a speaker unit 1 for converting an electrical signal into an air vibration to reproduce a sound is mounted at an upper end portion of a vertically installed cylindrical casing 2 such that a diaphragm 4 is directed up, a support rod 7 extended downwards from a back side of the speaker unit 1 passes through many elastic, spongy core sound absorbers 8 stacked from top to bottom, the core sound absorbers 8 together with the support rod 7 are inserted in the casing 2 as ensuring a vertically communicating space, a holding member 17 for opening an internal space outward is fitted in a lower end portion of the casing 2, so that the holding member 17 receives the core sound absorbers 8 from below, and the holding member 17 is locked to the lower end portion of the support rod 7 via a cushioning member 18.

Description

  The present invention relates to a speaker device that takes into account faithful reproduction of a low-frequency waveform, particularly in musical sounds.

  In general, a speaker device is a speaker unit consisting of a diaphragm, coils, magnets, and a frame. The speaker unit is attached to a box-shaped or spherical housing so that the diaphragm faces the front, and the speaker unit converts electrical signals into vibration of the diaphragm. Thus, the sound is reproduced, and the rear surface of the housing is closed.

  In the speaker device having such a structure, the sound wave radiated from the back surface of the diaphragm of the speaker unit is reflected by the wall surface of the housing, and pressure is applied to the back surface of the diaphragm to increase the reactance of the acoustic impedance. There is a problem that the sound pressure radiated from the front of the plate changes with frequency, the phase characteristics are greatly disturbed, and high-fidelity reproduction is hindered.

  As a speaker device for improving the above problem, the following Patent Document 1 (paragraphs 0074-0078, FIG. 27) describes the speaker device shown in FIG. In this speaker device, the speaker unit 51 is attached to the upper end portion of a cylindrical casing 53 that is supported upright by a support base 52 on the installation surface G so that the diaphragm 54 faces upward. ing.

  In this speaker device, a rod-shaped weight 56 is extended downward from the back surface of the magnet 55 located on the lower side of the diaphragm 54, and substantially the entire outer periphery of the rod-shaped weight 56 is surrounded by a cylindrical urethane tube 57. A sound absorbing sheet 58 made of glass fiber is wound, and a sound absorbing material 59 made of glass wool or felt is wound around the uppermost portion, and this is filled in the housing 53.

Japanese Patent No. 3484143

  However, in the speaker device as shown in FIG. 10, the sound quality cannot be finely adjusted and set, and the sound absorbing materials 58 and 59 are held around the rod-shaped weight 56 at the time of manufacture. There is a problem that it is difficult to stabilize the sound quality by winding the sound-absorbing materials 58 and 59 uniformly in mass production, in addition to the work such as tying with a thread, which is troublesome.

  In addition, if the handle is handled roughly, the rod-shaped weight 56 may swing around the upper end portion, and the speaker unit 51 or the like may be damaged due to vibrations or impacts generated by the swing.

  Therefore, an object of the present invention is to make it possible to easily adjust the sound quality and to perform the manufacturing work, and to prevent breakage due to vibration or impact during transportation.

  In order to solve the above-mentioned problems, in the present invention, a speaker unit that reproduces sound by converting an electrical signal into air vibration is arranged such that a diaphragm is located at the upper end of a cylindrical casing that is installed in a vertical direction. In the speaker device mounted so as to face, a large number of elastic sponge-like sound absorbing materials are laminated and inserted into a support rod extending downward from the back side of the speaker unit from the upper part to the lower part, Inserting the core sound-absorbing material together with the support rod while securing a space communicating with the top and bottom inside, fitting a holding member that opens the internal space to the lower end of the housing, and holding the core sound-absorbing by the holding member The material is received from below, and the lower end portion of the support bar and the holding member are locked via the buffer member.

  Further, as the core sound-absorbing material, a star-shaped sound-absorbing material having a plurality of radially extending arm portions and a small circular sound-absorbing material having a smaller diameter than the tip of the arm portion are used in combination.

  Further, as the core sound absorbing material, in addition to the star-shaped sound absorbing material and the small circular sound absorbing material, a large circular sound absorbing material having a plurality of openings penetrating vertically is inserted on the lower side of the casing. The sound absorbing material is surrounded by the inner periphery of the housing.

  In the speaker device according to the present invention, the sound quality can be easily adjusted and set by variously changing the shape and orientation of the core sound-absorbing material, the number of laminated layers, the material, and the like. Thus, there is no need for work such as winding and tying with a thread, so that there is no variation during production, and workability is excellent, and good and stable sound quality is obtained.

  In addition, since the lower end of the support bar is locked to the holding member fitted to the lower end of the housing via a cushioning material, the support bar may oscillate vigorously when it is carried along with a change in installation location, etc. This prevents damage to the speaker unit and the like, and can be easily transported.

1 is a schematic perspective view of a speaker device according to an embodiment of the present invention. Longitudinal sectional view (A) perspective view showing a star-shaped sound absorbing material, (b) perspective view showing a small circular sound absorbing material, (c) perspective view showing a large circular sound absorbing material. The perspective view which shows the lamination | stacking process of a core part sound-absorbing material same as the above. The perspective view which shows the insertion process to a housing | casing same as the above. Upper enlarged vertical sectional view in the assembled state The perspective view which shows the assembly process of the lower part same as the above Lower enlarged vertical sectional view in the same assembly state The perspective view which shows other embodiment of a core part sound-absorbing material Partially cutaway perspective view showing a conventional speaker device

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  In this speaker device, as shown in FIGS. 1 and 2, a speaker unit 1 is attached to an upper end portion of a cylindrical casing 2 installed in a vertical direction, and the casing 2 is attached to three legs. The support 3 having the body 3a is supported on an installation surface such as a floor or a rack serving as a ground.

  The speaker unit 1 supports the diaphragm 4 with a frame 5, and includes a coil and a magnet 6 on the back side of the central portion of the diaphragm 4, and an electric signal input to the coil interacts with the coil and the magnet 6. The sound is converted into vibration of the diaphragm 4 to reproduce sound, and is attached to the housing 2 so that the diaphragm 4 faces upward in order to secure a wide sound field space.

  An upper end portion of a support rod 7 that is a metal screw rod is screwed and fixed to the center portion of the magnet 6 so as to extend downward in an assembled state. A sponge plate-like core sound absorbing material 8 made of elastic urethane foam or the like is inserted into the support rod 7 by laminating a plurality of layers from the upper part to the lower part using a shaft hole 8a provided in the center part. ing.

  As the core sound-absorbing material 8, as shown in FIG. 3 (a), a star-shaped sound absorbing material 9 having a plurality of radially extending arms, and as shown in FIG. 3 (b), a star-shaped sound absorbing material 9 is provided. The small circular sound-absorbing material 10 having a smaller diameter than the tip of the arm portion and the large circular sound-absorbing material 11 in which the upper and lower two layers of the large-diameter portion are constricted are used in combination as shown in FIG.

  Near the outer periphery of the large circular sound absorbing material 11, a plurality of round hole openings 11 a penetrating vertically are formed side by side in the circumferential direction. A notch for inserting a lead wire C extending downward from the speaker unit 1 is formed outside the opening 11a.

  As shown in FIG. 4, the star-shaped sound absorbing material 9 and the small circular sound-absorbing material 10 are alternately inserted into the support rods 7, and the core sound-absorbing material 8 stacked in this way is shown in FIG. As shown in FIG. 2, the support rod 7 is inserted into the housing 2.

  At this time, as shown in FIGS. 5 and 6, a short cylindrical mounting member 12 is fitted to the upper end portion of the housing 2 in order to fit and hold the speaker unit 1, and the groove portion of the mounting member 12 and the frame A rubber shock-absorbing member 14 is fitted between the flanges 13 provided at 5.

  Further, a protective cover 15 having a dome-shaped mesh portion is covered on the upper end of the flange 13 at the upper end of the frame 5 in order to protect the diaphragm 4. It is locked to.

  On the other hand, at the lower end of the housing 2, as shown in FIGS. 7 and 8, the large circular sound absorbing material 11 is inserted through the support bar 7. A connecting cylinder 2a is fixed to a lower inner periphery of the casing 2 by a set screw 2c with a buffer member 2b such as sponge interposed therebetween, and the lower end of the casing 2 and the support base 3 are connected to the connecting cylinder 2a. Is connected to the opening of the support 3 by screwing.

  As shown in FIGS. 2, 6 and 8, a circumferential sound absorbing material 16 is stretched in a cylindrical shape from the upper end side to the lower end side, as shown in FIGS. The large circular sound absorbing material 11 is inscribed in the connecting cylinder 2a.

  A holding member 17 is fitted to the lower end portion of the housing 2, and as shown in FIGS. 7 and 8, the holding member 17 has an opening 17 a between the spokes connecting the central boss and the outer ring. It is supposed to be equipped with. The core sound absorbing material 8 is received from below by the holding member 17, and the lower end portion of the support bar 7 and the holding member 17 are locked via a rubber cushioning member 18.

  In this locking portion, the support rod 7 protruding downward from the boss portion of the holding member 17 is inserted into the central hole of the buffer member 18, and the washer 19 is fitted into the support rod 7 protruding downward from the buffer member 18. The nut 20 is screwed and tightened.

  As shown in FIGS. 1 and 2, the speaker unit 1 and the housing 2 are connected to each other with the compression force applied to the buffer members 14 and 18 by screwing the nut 20 into the lower end portion of the support bar 7. It is integrated. In this assembled state, a space communicating vertically is secured inside the housing 2, and this internal space is opened to the outside through the opening 17 a of the holding member 17.

  Here, as the core sound-absorbing material 8, as shown in FIG. 9, for example, a small circular sound-absorbing material 10 and a cylindrical sound-absorbing material 21 having a smaller diameter than this are alternately stacked and inserted into the support rod 7, etc. The thing of various lamination | stacking aspects can be used.

  In addition, a cut reaching the shaft hole 8a from the outer periphery is made in each member of the core sound absorbing material 8, so that each member of the core sound absorbing material 8 can be inserted into the support rod 7 from the outer diameter direction through this notch. Thus, the lamination mode may be easily changed.

  In the speaker device as described above, the sound quality can be easily adjusted and set by variously changing the shape and orientation of the core sound-absorbing material 8, the number of laminated layers, the material, and the like. Since work such as wrapping a material and tying it with a thread is not required, there is no variation during production, and workability is excellent, and a good and stable sound quality is obtained.

  In addition, since the lower end portion of the support bar 7 is locked to the holding member 17 fitted to the lower end portion of the housing 2 via the buffer member 18, the support bar 7 can be used when being carried along with a change in the installation location. The loudspeaker unit 1 or the like is prevented from being damaged, and can be easily transported.

DESCRIPTION OF SYMBOLS 1 Speaker unit 2 Housing | casing 2a Connection pipe | tube 2b Buffer member 2c Set screw 3 Support stand 3a Leg 4 Diaphragm 5 Frame 6 Magnet 7 Support rod 8 Core part sound-absorbing material 8a Shaft hole 9 Star-shaped sound-absorbing material 10 Small circular sound-absorbing material 11 Large circular sound absorbing material 11a Opening portion 12 Mounting member 13 Flange 14 Buffer member 15 Protective cover 16 Surrounding sound absorbing material 17 Holding member 17a Opening portion 18 Buffering member 19 Washer 20 Nut 21 Cylindrical sound absorbing material C Lead wire

Claims (3)

  The speaker unit (1) that converts electrical signals into air vibrations and reproduces sound so that the diaphragm (4) faces upward at the upper end of the cylindrical housing (2) that is installed vertically. In the speaker device attached to the support unit (7) extending downward from the back side of the speaker unit (1), a large number of sponge-like sound absorbers (8) having elasticity are laminated from the top to the bottom. Inserting the core sound-absorbing material (8) together with the support rod (7) while securing a space communicating vertically with the inside of the housing (2), at the lower end of the housing (2), A holding member (17) that opens the internal space to the outside is fitted, the core sound absorbing material (8) is received from below by the holding member (17), and the lower end of the support bar (7) and the holding member (17) are connected. A speaker device, which is locked via a buffer member (18).   As the core sound-absorbing material (8), a star-shaped sound-absorbing material provided with a plurality of radially extending arm portions and (9), a small circular sound-absorbing material having a smaller diameter than the tip of the arm portion (10) was used in combination. The speaker device according to claim 1.   As the core sound-absorbing material (8), in addition to the star-shaped sound-absorbing material (9) and the small circular sound-absorbing material (10), a plurality of openings (11a) penetrating vertically on the lower side of the housing (2) 3. A loudspeaker device according to claim 2, wherein a large circular sound absorbing material (11) is inserted and the large circular sound absorbing material (11) is surrounded by the inner periphery of the housing (2). .

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