JP2008154160A - Movable speaker apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a "movable speaker apparatus" capable of smoothly turning a speaker body with respect to a housing with uniform operating power. <P>SOLUTION: The outer circumferential surface of a speaker body 2 is brought into spherical contact with a spherical guide part 5b provided to the inner wall surface of the housing 3 with a bottom and tension is applied from the back side of the speaker body 2 using a cone-shaped compression coil spring 11 the winding diameter of which is gradually changed from one end portion to another end portion, so that in a state a small-diameter part 11b at one end side of the compression coil spring 11 is brought into elastic contact with a planar receiving plane 2a in the center of a bottom face of the speaker body 2 at all times, the speaker body 2 can be turned at an arbitrary angle. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a movable speaker device suitable for use in an in-vehicle audio system and the like, and more particularly, to a movable speaker device of a type in which a speaker body rotates by making spherical contact with a spherical guide portion of a housing. .

  In an in-vehicle audio system, low-frequency and high-frequency speakers may be arranged at appropriate positions in the vehicle to achieve a high-quality acoustic space. Of these, high-frequency speakers are used for dashboard edges and doors. Since it is often disposed at a corner of the vehicle interior such as the inner wall of the vehicle, a structure that can change the sound output direction is widely adopted.

  Conventionally, as an example of a speaker device that can change the sound output direction in this way, a speaker body is installed inside a spherical body, and a part of the spherical body is installed in a mounting plate such as a cabinet. The spherical body and the speaker body can be adjusted to an arbitrary angle with respect to the mounting plate by projecting from the mouth and pressing the outer circumferential surface of the spherical body against the inner circumferential surface of the opening using a plurality of tension coil springs. A movable speaker device is known (for example, see Patent Document 1). In such a known movable speaker device, since the spherical body containing the speaker main body is held on the mounting plate by the tensile force of the tension coil spring, the spherical body protruding from the mounting port of the mounting plate is used as the tensile force of the tensile coil spring. By pushing against and rotating against this, the output direction of the sound output from the speaker body can be changed to the user's preferred direction. However, when attaching the spherical body with the built-in speaker body to the mounting plate, it is necessary to hang both ends of the tension coil spring between the mounting plate and the spherical body using a wide space on the back side of the mounting plate. This is not suitable as a movable speaker device in which a genuine product mounted in a mounting hole of an installation member such as a dashboard can be replaced with a desired speaker body.

  Therefore, the present inventors, as a movable speaker device that can be easily attached to and detached from the mounting hole of the installation member, have a structure in which the speaker body is rotatably held inside the housing and both are unitized. Suggested something first. Hereinafter, the movable speaker device according to the conventional proposal will be described with reference to FIGS. 3 and 4. The movable speaker device 1 includes a speaker body 2 that outputs sound and a speaker body 2 that rotatably holds the speaker body 2. And a compression coil spring 4 interposed between the bottom surface of the speaker body 2 and the inner bottom surface of the housing 3. Speaker components such as a magnetic circuit and a voice coil (not shown) are accommodated in the speaker main body 2, and sound generated by the speaker components is output from the upper surface of the speaker main body 2. The outer peripheral surface of the speaker body 2 is formed in a spherical shape centering on a point O in the figure, and the bottom surface of the speaker body 2 is a flat surface. The housing 3 includes a cylindrical holding body 5 that is open at both upper and lower ends, and a bottom lid 6 that closes the lower end side opening of the holding body 5, and both 5 and 6 are joined and integrated by press-fitting, snap coupling, or the like. Yes. A male screw portion 5 a is engraved on the outer peripheral surface of the holding body 5, and this male screw portion 5 a can be screwed into a mounting hole 7 a drilled in the installation member 7. A spherical guide portion 5 b is formed on the inner peripheral surface of the holding body 5, and the spherical guide portion 5 b is also formed in a spherical shape centered on the point O. The compression coil spring 4 is interposed between the center portion of the bottom surface of the speaker body 2 and the center portion of the top surface of the bottom cover 6. The compression coil spring 4 receives the elastic force of the compression coil spring 4 and holds the outer periphery surface of the speaker body 2. The spherical guide portions 5b of the body 5 are in spherical contact with each other.

The movable speaker device 1 configured as described above has an installation member such as a dashboard installed at an appropriate position in the vehicle interior by screwing the male screw portion 5a of the holding body 5 into the mounting hole 7a of the installation member 7. 7 is used by attaching. When the movable speaker device 1 is used, when the speaker body 2 is in the initial position in the vertical direction as shown in FIG. 3, the compression coil springs 4 are located at the center of the bottom surface of the speaker body 2 facing each other in parallel. Between the outer peripheral surface of the speaker body 2 and the spherical guide portion 5b of the holding body 5 by the elastic force of the compression coil spring 4. Spherical contact is made with uniform frictional force over the entire circumference. Further, when adjusting the posture of the speaker body 2 to an arbitrary inclination angle from the initial position, the user protrudes an arbitrary portion of the speaker body 2 protruding from the upper surface of the holding body 5, for example, the right end portion of FIG. When the pressing operation is performed, the outer peripheral surface of the speaker body 2 rotates around the point O while making spherical contact with the spherical guide portion 5b of the holding body 5, and the posture of the speaker body 2 is spherical as shown in FIG. It is held at an arbitrary inclination angle by the frictional force with the guide portion 5b.
Japanese Utility Model Publication No. 47-14133

  In the movable speaker device 1 according to the conventional proposal described above, the housing 3 in which the speaker main body 2 is unitized can be easily attached to the installation member 7 such as a dashboard, and the rear surface of the rotatable speaker main body 2 can be provided. By applying tension with the elastic force of the compression coil spring 4 from the side and pressing it against the spherical guide portion 5b of the holding body 5, the speaker main body 2 can be tilted at an arbitrary inclination angle by the frictional force generated at the spherical contact portion between the two. While having the advantage of being able to hold, it is not without problems. That is, while the speaker body 2 is rotated from the initial position in FIG. 3 to the maximum tilt position in FIG. 4, the flat bottom surface of the speaker body 2 is inclined with respect to the inner bottom surface (upper surface of the bottom cover 6) of the housing 3. As a result, the upper end of the compression coil spring 4 which has been in contact with the center of the bottom surface of the speaker body 2 at the initial position with a uniform elastic force gradually moves toward the outer peripheral edge of the bottom surface of the speaker body 2, and accordingly the compression coil Since only the right side portion of the spring 4 is gradually compressed, a repulsive force (arrow M in FIG. 4) that tries to rotate the speaker body 2 in the direction opposite to the rotation direction is stored in the compression coil spring 4. Go. Since the tension of the compression coil spring 4 varies greatly depending on the inclination angle of the speaker main body 2 as described above, the operating force required to rotate the speaker main body 2 becomes larger as it approaches the maximum inclination position. There is a problem that the operation feeling at the time of angle adjustment is poor for the user who rotates 2.

  The present invention has been made in view of the actual situation of the prior art, and an object of the present invention is to provide a movable speaker device capable of smoothly rotating a speaker body with a uniform operation force with respect to a housing. There is to do.

  The present invention provides a conical compression coil in which the outer peripheral surface of a speaker body is in spherical contact with a spherical guide provided on the inner wall surface of a bottomed housing, and the winding diameter gradually changes from one end to the other end. By applying tension from the back side of the speaker body using a spring, the speaker body can be rotated to an arbitrary angle while the small diameter part on one end of the compression coil spring is always in elastic contact with the bottom center of the speaker body. I was able to do it.

  In the movable speaker device of the present invention, the outer peripheral surface of the speaker body is brought into spherical contact with the spherical guide portion provided on the inner wall surface of the bottomed housing, and the winding diameter gradually changes from one end portion to the other end portion. By applying tension from the back side of the speaker body using a conical compression coil spring, the small diameter portion on one end side of the compression coil spring always elastically contacts the bottom center of the speaker body regardless of the rotation angle of the speaker body. With this configuration, the amount of change in the tension of the compression coil spring due to the difference in the inclination angle of the speaker body is very small, and the user can rotate the speaker body to an arbitrary angle with a good operation feeling. .

  In the movable speaker device of the present invention, a bottomed housing in which a spherical guide portion is provided on the inner wall surface of the hollow portion having an open front surface, and the outer peripheral surface is in spherical contact with the guide portion so that the housing rotates. A speaker body held in a movable manner, and a conical compression coil spring interposed between the inner bottom surface of the housing and the bottom surface of the speaker body, Position the large-diameter portion on the larger diameter side at the center of the inner bottom surface of the housing, and elastically contact the small-diameter portion on the smaller winding diameter side with the central portion of the bottom surface of the speaker body without changing this elastic contact portion. The speaker body is configured to rotate.

  In the movable speaker device configured as described above, a conical shape in which the winding diameter gradually changes from one end portion to the other end portion as a member that applies tension by pressing the outer peripheral surface of the speaker body against the spherical guide portion of the housing. The compression coil spring is used so that the small diameter portion of the compression coil spring is always in elastic contact with the center of the bottom surface of the speaker body regardless of the rotation angle of the speaker body. The amount of change in tension of the speaker becomes very small, and the user can rotate the speaker body to an arbitrary angle with a good operation feeling.

  In the above configuration, the means for positioning the large diameter portion of the compression coil spring at the center of the inner bottom surface of the housing is not particularly limited, but an annular positioning protrusion is provided on the inner bottom surface of the housing to surround the large diameter portion of the compression coil spring. It is preferable that the large-diameter portion can be easily positioned by arranging the large-diameter portion inside the positioning protrusion.

  In the above configuration, the small diameter portion of the compression coil spring may be fixed to the central portion of the bottom surface of the speaker body by some means to restrict movement in the radial direction, but at least the compression coil spring of the bottom surface of the speaker body may be restricted. When a flat receiving surface is formed at a location facing the small diameter portion and the small diameter portion is elastically contacted with the flat receiving surface, a compression coil spring is easily incorporated between the bottom surface of the speaker body and the inner bottom surface of the housing. Is preferable. In this case, when the flat receiving surface is inclined with respect to the inner bottom surface of the housing with the rotation of the speaker body, the small diameter portion whose radial rigidity is lower than the large diameter portion also follows the flat receiving surface. Therefore, the small diameter portion of the compression coil spring can always be brought into elastic contact with the flat receiving surface regardless of the inclination angle of the speaker body.

  The embodiment will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing an initial state before the turning operation of the movable speaker device according to the embodiment, and FIG. 2 is an inclination after the turning operation of the movable speaker device. It is sectional drawing which shows a state, and attaches | subjects the same code | symbol to the part corresponding to FIG.

  As shown in FIGS. 1 and 2, a movable speaker device 10 according to this embodiment includes a speaker body 2 that outputs sound, a bottomed housing 3 that rotatably holds the speaker body 2, and a speaker. A conical compression coil spring 11 is interposed between the bottom surface of the main body 2 and the inner bottom surface of the housing 3.

  Speaker components such as a magnetic circuit and a voice coil (not shown) are accommodated in the speaker main body 2, and sound generated by the speaker components is output from the upper surface of the speaker main body 2. The outer peripheral surface of the speaker body 2 is formed in a spherical shape centering on a point O in the figure, and the entire bottom surface of the speaker body 2 is a flat receiving surface 2a. The housing 3 includes a cylindrical holding body 5 that is open at both upper and lower ends, and a bottom lid 6 that closes the lower end side opening of the holding body 5, and both 5 and 6 are joined and integrated by press-fitting, snap coupling, or the like. Yes. A male screw portion 5 a is engraved on the outer peripheral surface of the holding body 5, and this male screw portion 5 a can be screwed into a mounting hole 7 a drilled in the installation member 7. A spherical guide portion 5 b is formed on the inner peripheral surface of the holding body 5, and the spherical guide portion 5 b is also formed in a spherical shape centered on the point O. A positioning projection 6a is erected at the center of the inner bottom surface of the bottom lid 6. The positioning projection 6a is formed in an annular shape around a vertical line P passing through the point O. In addition, a restriction projection 6b that stands along the inner peripheral surface of the holding body 5 is provided on the peripheral edge of the bottom cover 6 and, as will be described later, an outer edge portion of the speaker body 2 at the upper end of the restriction projection 6b. Makes the maximum inclination angle of the speaker main body 2 defined.

  The compression coil spring 11 is formed in a conical shape so that the winding diameter gradually changes with each turn. By inserting the large diameter portion 11a having the largest winding diameter inside the positioning projection 6a, the compression coil spring 11 The lower end is positioned at the center of the inner bottom surface of the bottom lid 6 (housing 3). The upper end portion of the compression coil spring 11 is a small-diameter portion 11b having the smallest winding diameter, and the small-diameter portion 11b is held in contact with the outer peripheral surface of the speaker body 2 by elastic contact with the central portion of the flat receiving surface 2a. The spherical guide portion 5 b of the body 5 is in spherical contact with each other by receiving the elastic force of the compression coil spring 11.

  The movable speaker device 10 configured as described above has an installation member such as a dashboard installed at an appropriate position in the vehicle interior by screwing the male screw portion 5a of the holding body 5 into the mounting hole 7a of the installation member 7. 7 to be used. When the movable speaker device 10 is used, when the speaker body 2 is in the initial position in the vertical direction as shown in FIG. 1, the center of the flat receiving surface 2a and the central axis of the compression coil spring 11 are The small diameter portion 11b of the compression coil spring 11 is on the vertical line P and is in elastic contact with the central portion of the flat receiving surface 2a. Accordingly, the compression coil spring 11 is uniformly compressed between the flat receiving surface 2a of the speaker body 2 and the central portion of the inner bottom surface of the bottom cover 6 facing each other in parallel. Due to the force, the outer peripheral surface of the speaker body 2 and the spherical guide portion 5b of the holding body 5 are in spherical contact with a uniform frictional force over the entire circumferential direction.

  Further, when the posture of the speaker body 2 is adjusted to an arbitrary inclination angle from the initial position, the user protrudes an arbitrary portion of the speaker body 2 protruding from the upper surface of the holding body 5, for example, the right end portion in FIG. When the pressing operation is performed, the outer peripheral surface of the speaker body 2 rotates around the point O while making spherical contact with the spherical guide portion 5b of the holding body 5, and the outer edge portion of the speaker body 2 is restricted as shown in FIG. The position of the speaker body 2 is maintained at an arbitrary inclination angle by the frictional force with the spherical guide portion 5b until it comes into contact with the upper end of the protrusion 6b and reaches the maximum inclination position.

  At that time, when the flat receiving surface 2a is inclined in an arbitrary direction with respect to the inner bottom surface of the bottom cover 6 as the speaker body 2 is rotated, the small-diameter portion 11b having lower radial rigidity than the large-diameter portion 11a. Also follows the flat receiving surface 2a and inclines in the same direction, so that the elastic contact state between the small diameter portion 11b of the compression coil spring 11 and the central portion of the flat receiving surface 2a is maintained regardless of the inclination angle of the speaker body 2. The That is, when Q is a straight line extending from the point O to the center of the flat receiving surface 2a, the angle θ formed by the straight line Q and the vertical line P gradually increases as the speaker body 2 is rotated. Regardless of the size, the small diameter portion 11b of the compression coil spring 11 is always in elastic contact with the flat receiving surface 2a on the straight line Q. Therefore, when the speaker body 2 is rotated to the maximum tilt position shown in FIG. However, the repulsive force (arrow M in FIG. 2) of the compression coil spring 11 that tries to rotate the speaker body 2 in the direction opposite to the rotational direction is very small. Therefore, the amount of change in the tension of the compression coil spring 11 due to the difference in the inclination angle θ of the speaker body 2 is very small, and the user can turn the speaker body 2 to an arbitrary angle with a good operation feeling. . As is clear from FIG. 2, when the speaker body 2 is rotated to the maximum tilt position, each winding diameter portion including the small diameter portion 11b of the compression coil spring 11 is compressed in a skidding state. The compression stroke of the compression coil spring 11 can be made larger than that of a general compression coil spring (see FIGS. 3 and 4) having the same winding diameter.

  In the above-described embodiment, the case where the entire bottom surface of the speaker body 2 is the flat receiving surface 2a has been described. However, the bottom surface of the speaker body 2 has at least a portion where the small diameter portion 11b of the compression coil spring 11 is elastically contacted. It suffices if the surface 2a is formed, and other portions can be formed into a concavo-convex shape as necessary.

  In the above embodiment, the case where the housing 3 can be attached to the installation member 7 such as a dashboard by screwing has been described. However, the housing 3 is attached to the installation member 7 using a bracket or the like (not shown). It may be.

It is sectional drawing which shows the initial state before rotation operation of the movable speaker apparatus which concerns on an Example. It is sectional drawing which shows the inclination state after rotation operation of this movable speaker apparatus. It is sectional drawing which shows the initial state before rotation operation of the movable speaker apparatus based on a conventional proposal. It is sectional drawing which shows the inclination state after rotation operation of this movable speaker apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 2 Speaker main body 2a Flat receiving surface 3 Housing 5 Holding body 5b Spherical guide part 6 Bottom cover 6a Positioning protrusion 7 Installation member 10 Movable speaker apparatus 11 Compression coil spring 11a Large diameter part 11b Small diameter part

Claims (3)

A bottomed housing in which a spherical guide portion is provided on the inner wall surface of a hollow portion having an open front surface, and a speaker main body rotatably held on the housing by an outer peripheral surface being in spherical contact with the guide portion; A conical compression coil spring interposed between the inner bottom surface of the housing and the bottom surface of the speaker body,
Of the two end portions of the compression coil spring, the large diameter portion on the side with the larger winding diameter is positioned at the center portion on the inner bottom surface of the housing, and the small diameter portion on the side with the smaller winding diameter is elastically positioned on the bottom center portion of the speaker body. A movable speaker device characterized in that the speaker main body rotates without touching and changing the elastic contact portion.   2. The movable speaker device according to claim 1, wherein an annular positioning protrusion that surrounds the large-diameter portion is provided on the inner bottom surface of the housing.   3. The method according to claim 1, wherein a flat receiving surface is formed on at least a portion of the bottom surface of the speaker body facing the small diameter portion, and the small diameter portion is elastically contacted with the flat receiving surface. A movable speaker device.

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