JP6137942B2 - Speaker system - Google Patents

Description

The present invention relates to a speaker system, and more particularly, to a speaker system that is small in size and low in cost and has high output sound pressure.
In the present specification, the speaker system means a speaker system and a cabinet (enclosure) to which the speaker unit is attached.

  2. Description of the Related Art In recent years, there has been a demand for thinning and slimming (narrow width) in a speaker system mounted on a thin TV or the like. However, if the speaker unit incorporated in a thin cabinet is made thin and slim, the area of the diaphragm and the size of the magnetic circuit are limited, and there is a problem that the output sound pressure decreases.

  Therefore, a speaker system has been proposed in which the frame that supports the outer peripheral side of the diaphragm of the speaker unit is eliminated and the outer peripheral side of the diaphragm is directly supported by a cabinet. With such a configuration, the area of the diaphragm is increased, so that a reduction in output sound pressure can be prevented to some extent (see, for example, Patent Document 1).

JP 2001-285999 A

  However, in the speaker system described in Patent Document 1, since the magnetic circuit is arranged in the cabinet, the size of the magnetic circuit is limited, and a decrease in output sound pressure is still inevitable. If a neodymium magnet (Nd magnet) having a strong magnetic force is used as the magnet of the magnetic circuit, a decrease in the output sound pressure of the speaker system can be prevented even if the magnetic circuit is thin and slim. However, neodymium magnets have a problem that costs are higher than ferrite magnets that are generally used.

In addition, in the case where the cabinet must be extremely narrow, even if a neodymium magnet is used, the performance may still be insufficient.
The present invention has been made in view of the above problems, and an object thereof is to provide a speaker system that is small in size, low in cost, and high in output sound pressure.

In order to achieve at least one of the above problems, a speaker system reflecting one aspect of the present invention includes a cabinet having an opening, a diaphragm disposed in the opening, and an outer peripheral side attached to the cabinet. A magnetic circuit provided on the surface of the diaphragm opposite to the sound wave radiation surface, a speaker unit including a voice coil attached to the inner peripheral side of the diaphragm and disposed in the magnetic gap of the magnetic circuit; The outer surface of the magnetic circuit in a direction perpendicular to the vibration direction of the diaphragm is exposed to the outside of the cabinet, and only the outer surface of the magnetic circuit in the direction perpendicular to the vibration direction of the diaphragm is It is exposed outside the cabinet .

  Other features of the present invention will become more apparent from the following detailed description and accompanying drawings.

  According to the speaker system of the present invention, at least the outer surface of the magnetic circuit in the direction orthogonal to the vibration direction of the diaphragm is exposed to the outside of the cabinet, so that the size of the magnetic circuit can be reduced even if the cabinet is small. Can be increased. For this reason, the size of the magnet of the magnetic circuit can be increased, and even when an inexpensive magnet having a weak magnetic force is used, a sufficient magnetic force can be obtained and the output sound pressure of the speaker system is increased.

  Other effects of the present invention will become more apparent from the following detailed description and accompanying drawings.

It is a perspective view of the speaker system of a 1st embodiment. It is an II directional arrow line view of FIG. FIG. 3 is an end view (cut end view) taken along a cutting line III-III in FIG. 2. FIG. 3 is a plan view of FIG. 2. FIG. 5 is an end view (cut portion end view) taken along a cutting line V-V in FIG. 4. It is an end view of 2nd Embodiment.

<First Embodiment>
The speaker according to the first embodiment will be described with reference to FIGS. 1 is a perspective view of the speaker system of the first embodiment, FIG. 2 is a view taken in the direction of the arrow II in FIG. 1, FIG. 3 is an end view taken along section line III-III in FIG. 2 is a plan view of FIG. 2, and FIG. 5 is an end view taken along the cutting line VV of FIG. 4 (cut portion end view).

  First, the overall configuration of the speaker system of this embodiment will be described with reference to FIGS. 1, 2, and 4. FIG. The speaker system 1 includes a substantially rectangular parallelepiped cabinet 3 and a speaker unit 5 provided on the upper surface of the cabinet 3.

Next, the cabinet 3 and the speaker unit 5 will be described in detail.
(Cabinet 3)
As shown in FIGS. 1 and 4, a recess 3 b having a width w equal to the width W of the cabinet 3 is formed at the center of the substantially rectangular upper surface of the cabinet 3. A track-shaped (rounded rectangular) opening 3d is formed on the bottom surface 3c of the recess 3b.

In the cabinet 3, a pipe line 7 that penetrates from one side surface to the opposite side surface is formed, and a magnetic circuit 51 of the speaker unit 5 is disposed in the pipe line 7.
(Speaker unit 5)
As shown in FIGS. 3 and 5, the speaker unit 5 of the present embodiment includes a diaphragm ring 11 having a track-shaped opening, a track-shaped diaphragm, a cone paper (vibrating plate) 31 in the present embodiment, The cone circuit 31 is roughly divided into a magnetic circuit 51 provided on the surface opposite to the sound wave emitting surface r and a voice coil 35 attached to the inner peripheral side of the cone paper 31 and disposed in the magnetic gap of the magnetic circuit 51. Is done.

  The diaphragm ring 11 has a rectangular base portion 11a disposed on the bottom surface 3c of the recess 3b of the cabinet 3, and extends from the base portion 11a into the opening 3d of the recess 3b. It consists of a frustum part 11b whose horizontal cross-sectional area becomes narrower as it enters 3d.

  A track-shaped cone paper 31 is disposed so as to cover the opening of the frustum portion 11 b of the diaphragm ring 11. That is, the cone paper 31 is disposed in the opening 3 d of the cabinet 3. A substantially circular hole 31 a is formed at the center of the cone paper 31. The outer peripheral portion of the cone paper 31 is attached to the base portion 11 a of the diaphragm ring 11 via the edge 33. Therefore, the cone paper (vibrating plate) 31 can vibrate in the vertical direction in FIGS.

  A voice coil 35 is attached to the hole 31 a of the cone paper 31. The voice coil 35 has a cylindrical bobbin 37 attached to the hole 31a of the cone paper 31 in a state where both end surfaces are open surfaces and one end surface side (upper side) is fitted in the hole 31a of the cone paper 31; The coil 39 is wound around the outer surface of the bobbin 37 and supplied with an electrical signal.

A cap 40 is provided at the center of the cone paper 31 to cover the open surface on one end surface side of the bobbin 37.
A hole 7a is formed in the upper surface of the pipe line 7, and the lower part of the bobbin 37 protrudes into the pipe line 7 through the hole 7a. A magnetic circuit 51 is disposed in the pipe line 7. The magnetic circuit 51 is composed of a bottom yoke 55, a magnet 57 stacked on the bottom yoke 55, and a top yoke 61 that is stacked on the magnet 57 and attached to the upper surface of the pipe line 7. It has become. In the present embodiment, the bottom yoke 55 and the top yoke 61 have substantially the same rectangular shape, and the magnet 57 has a rectangular shape slightly larger than the bottom yoke 55 and the top yoke 61. Of the outer surface of the magnet 57, the outer surface in the direction orthogonal to the vibration direction of the cone paper (vibrating plate) 31, in this embodiment, the outer surfaces 57b and 57c (see FIG. 3) are exposed to the outside of the cabinet 3. Yes. In the present embodiment, the exposed outer surfaces 57 b and 57 c are flush with the outer surface of the cabinet 3.

A columnar center pole 53 that extends toward the bobbin 37 and fits into the inner cylinder portion from the open surface on the other end face side (downward side) of the bobbin 37 is formed at the center of the bottom yoke 55. It is integrally formed.
A hole 57 a through which the center pole 53 is inserted is formed at the center of the magnet 57. A hole 61 a through which the center pole 53 is inserted is also formed in the center portion of the top yoke 61.

  That is, a magnetic circuit in which a magnetic gap G is formed between the outer peripheral surface of the center pole 53 and the inner wall surface of the hole 61a of the top yoke 61 by the bottom yoke 55, the center pole 53, the magnet 57, and the top yoke 61. 51.

  The coil 39 of the voice coil 35 is wound around the bobbin 37 so as to be positioned in the magnetic gap G of the magnetic circuit 51. The bobbin 37 of the voice coil 35 has an annular damper whose inner peripheral part is attached to the bobbin 37 and whose outer peripheral part is attached to an annular protrusion 7b formed along the periphery of the hole 7a of the conduit 7. 41 is attached.

  Then, the upper surface of the top yoke 61 of the magnetic circuit 51 is coupled to the cabinet 3 over the entire circumference, so that air leakage from the cabinet 3 to the pipe line 7 is eliminated, and the back side surface of the cone paper 31 (the surface exposed to the outside) The radiated sound on the opposite side) does not leak directly out of the cabinet 3.

  Further, as shown in FIG. 5, the diaphragm ring 11 is provided with terminals 71 and 73, and current can be supplied to the coil 39 of the voice coil 35 via the lead wires 75 and 77.

  The operation of the speaker system having the above configuration will be described. When an electrical signal is input to the coil 39 of the voice coil 35 via the terminals 71 and 73, the cone paper 31 vibrates in the direction of arrow A in FIGS. Sound is radiated from the surface exposed to the outside of 31 (sound wave radiating surface).

Therefore, in the present embodiment, the magnetic circuit 51 is provided on the surface of the cone paper (vibrating plate) 31 opposite to the sound wave emitting surface.
According to the above configuration, of the outer surface of the magnet 57, the outer surfaces 57 b and 57 c that are the outer surfaces in the direction orthogonal to the vibration direction of the cone paper (diaphragm) 31 are flush with the outer surface of the cabinet 3. Therefore, the magnet 57 of the magnetic circuit 51 can be enlarged, and even if an inexpensive magnet having a weak magnetic force is used, a sufficient magnetic force can be obtained and the output sound pressure of the speaker system can be increased.

  In addition, this invention is not limited to the said embodiment. In the above embodiment, the outer surfaces 57b and 57c, which are the outer surfaces in the direction orthogonal to the vibration direction of the cone paper (diaphragm) 31 of the magnetic circuit 51, are made flush with the outer surface of the cabinet 3 among the outer surfaces of the magnet 57. It suffices to be at least outside the inner surface of the cabinet 3.

  In consideration of variations in component accuracy and variations in assembly accuracy, the outer surfaces 57b and 57c, which are the outer surfaces in the direction orthogonal to the vibration direction of the cone paper (diaphragm) 31 of the magnetic circuit 51, are connected to the outer surface and the inner surface of the cabinet 3. It may be in between.

Furthermore, if there is nothing that interferes with the outside of the cabinet 3, the outer surfaces 57b and 57c may protrude from the outer surface of the cabinet 3 to the outside.
Furthermore, a pipe line that is orthogonal to the pipe line 7 in the horizontal direction may be provided in the cabinet 3 so that the other outer surface of the magnet 57 is exposed to the outside of the cabinet 3. In this case, the magnet 57 of the magnetic circuit 51 can be further increased, and even if an inexpensive magnet having a weak magnetic force is used, a sufficient magnetic force can be obtained and the output sound pressure of the speaker system can be increased.

Moreover, although the said cabinet 3 was a sealing type, opening may be formed in the bottom face of the cabinet 3, for example, and it is good also as a bass-reflex type.
<Second Embodiment>
This will be described with reference to FIG. FIG. 6 is an end view of the second embodiment. In FIG. 6, the same parts as those in FIG. 5 of the first embodiment are denoted by the same reference numerals, and redundant description is omitted.

  The difference between this embodiment and 1st Embodiment is the presence or absence of a diaphragm ring. In the present embodiment, the diaphragm ring is not used, and the outer peripheral portion of the cone paper 31 is attached to the bottom surface 3 c of the recess 3 b of the cabinet 3 via the edge 33. Terminals 171 and 173 for supplying current to the coil 39 of the voice coil 35 are provided in the pipe line 7. A current can be supplied to the coil 39 of the voice coil 35 via lead wires 175 and 177 connected to the terminals 171 and 173.

  According to such a configuration, a diaphragm ring is not necessary, and the vibration area of the cone paper 31 can be secured wider than in the first embodiment, and the output sound pressure of the speaker system is increased.

3 Cabinet 5 Speaker unit 31 Cone paper (diaphragm)
51 Magnetic circuit 35 Voice coil 53 Center pole

Claims (4)

A cabinet with openings formed;
A diaphragm disposed in the opening and having an outer peripheral side attached to the cabinet, a magnetic circuit provided on a surface side opposite to the sound wave radiation surface of the diaphragm, and attached to an inner peripheral side of the diaphragm, the magnetic circuit A speaker unit comprising a voice coil disposed in the magnetic gap of
Consists of
At least the outer surface of the magnetic circuit in the direction orthogonal to the vibration direction of the diaphragm is exposed to the outside of the cabinet ,
Only the outer surface of the magnetic circuit in the direction orthogonal to the vibration direction of the diaphragm is exposed to the outside of the cabinet . The speaker system according to claim 1 , wherein a surface of the magnetic circuit exposed to the outside of the cabinet is outside the inner surface of the cabinet . Surface exposed to the outside of the cabinet of the magnetic circuit, the cabinet of the outer surface flush with, according to claim 2, wherein said at one or the other of the inside than the outer surface of the cabinet Speaker system. The cabinet, speaker system according to any one of claims 1 to 3, characterized in that a bass reflex type.