KR960014432B1 - Coil speaker for emitting four directions - Google Patents

Abstract

The digital coil speaker for emitting non-directions comprises: two metal rings 2,6 of the upper and lower side which are mounted to face each other; a lower plate 1, center pole 3, an upper plate 7 which form a line of magnetic force 20 passing 2-1-3-7-6 using themselves; and a voice coil 5 being rolled to a cylinder direction at a gap of the upper metal ring 6 and the lower metal ring 2, and moving itself into radius direction according to the flow current at a unit 4.

Description

Omni-directional movable coil speaker

1 is an exploded perspective view of the present invention.

2 is a cross-sectional view of the present invention.

3 shows the relationship between magnetic field, current and force in the voice coil.

4 is a first embodiment of the voice coil shape.

5 is a second embodiment of the voice coil shape.

6 is a third embodiment of the voice coil shape.

7 is a first embodiment of the present invention.

8 is a second embodiment of the present invention.

9 is a third embodiment of the present invention.

10 is a fourth embodiment of the present invention.

* Explanation of symbols for main parts of the drawings

1: base plate 2: lower metal ring

3: center pole 4: terminal

5: voice coil 6: upper metal ring

7: top plate 8: diaphragm

9: dome 10: diaphragm support

11: voice coil support 20: flow of magnetic lines

30: horn

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an omnidirectional movable coil speaker capable of evenly outputting sound in a planar direction without directionality.

Conventional speaker uses the Lorentz force generated in the axial direction of the speaker by forming a magnetic field in the direction of the hollow using a permanent magnet, and the current flows by winding the voice coil in the circumferential direction in the formed magnetic field To move the diaphragm. Therefore, the diaphragm of the speaker is reciprocated back and forth in one direction, thereby transmitting sound only in one direction. Due to the directionality of the speaker, the tone varies depending on the position when listening to music, and the area where stereo listening can be narrowed.

The present invention is to allow the diaphragm of the speaker to vibrate evenly in all directions of 360 degrees in the plane, so that the same sound can be heard in all directions, the problem of directionality, which is a problem in the conventional speaker is solved, so that the tone changes according to the listening position In addition, there is an advantage that the listening area of the stereo is widened, and the sound is radiated toward the wall of the room, and thus, the sense of space is increased by the reflected sound.

The speaker of the present invention can be manufactured in the form of an outer magnet in which the permanent magnet is in the form of a ring and an inner magnet in which the permanent magnet is in the form of a column.

The present invention will be described in detail with reference to the accompanying drawings.

Attach the lower metal ring (2) on the metal base plate (1), attach the center pole (3) to the center of the base plate (1), and place the top plate on which the top metal ring (6) is attached. A gap is formed between the ring 6 and the lower metal ring 2, and the voice coil 5 wound circumferentially is placed in this gap. The voice coil (5) is a voice coil support (11), positioned in the center gap between the lower metal ring (2) and the upper metal ring (6) and attaches a diaphragm (8) to the outer circumferential end of the voice coil (5). The diaphragm 8 is supported by the diaphragm support 10 to be in an accurate position. A dome 9 is attached to improve the speaker's frequency characteristics. 1, the diaphragm support 10 and the voice coil support 11 are not shown.

In the case of forming an inner magnet, the central column 3 becomes a permanent magnet, and in the case of an outer magnet, the central pillar 3 is polarized into one permanent magnet of the lower metal ring 2 and the upper metal ring 6.

The operating principle is explained by polarizing the center column 3 or the lower metal ring 2 or the upper metal ring 6 in the vertical direction to make a magnet, and the gap between the lower metal ring 2 and the upper metal ring 6. As shown in FIG. 3, a magnetic field is formed in the vertical direction. At this time, if the circumferential current flows in the voice coil 5, the voice coil is subjected to Lorentz force corresponding to `` the intensity of the magnetic field × the current × the coil length of the voice coil '' and the direction of the force is determined by Fleming's left hand law. This results in a radial direction that is perpendicular to the magnetic field and the current. Therefore, in the direction of the magnetic field and the current as shown in FIG. 3, the voice coil moves in the radial direction in which the concentric circles are widened, and moves in the direction in which the concentric circles are narrowed when the current direction is changed. Therefore, when the diaphragm 8 is bonded to the voice coil, the diaphragm is also moved together, so that sound can be emitted in all directions of 360 degrees.

4 is a view in which a part of the voice coil 5 is cut off. When the voice coil is wound in the form of a simple disk, it cannot be moved in the radial direction, so it is an embodiment to be able to move in the radial direction by winding it as shown in FIG.

FIG. 5 is a second embodiment of the voice coil and has a structure in which the voice coil is wound in a circumferential direction so as to be able to handle the expansion-contraction force in the radial direction according to the input current.

FIG. 6 is a third embodiment of the voice coil, in which the voice coil is wound. The rigid body portion 5a has a rigid structure in which the voice coil is fixed with an adhesive, and the flexible portion 5a. The part is a structure in which the voice coil is bent so that it can stretch or contract when the voice coil moves in the radial direction.

7 shows an embodiment of the present invention, in which two speakers of the present invention are overlapped and a diaphragm 8 is provided in common. The two upper and lower voice coils are connected in series or parallel, but connected so that the voice coils move in the same phase. This embodiment can make the area of the loudspeaker diaphragm more wide and is suitable for the case where a large output is required or when manufacturing for bass reproduction.

8 and 9 are structures that allow the gig to escape behind the diaphragm in order to lower the bass reproduction limit of the present invention. FIG. 3 is to empty the center of the central column 3 and open one side to create an air passage, and the upper plate ( 7) Or, it is a structure that lowers the resonance frequency of the speaker by making a hole in the center of the base plate (1) to allow air to escape to the rear of the diaphragm.

9 is a structure that lowers the resonant frequency of the speaker by drilling a hole outside the central column position of the base plate (1) or the top plate (7) to allow air to escape to the rear of the diaphragm.

FIG. 10 is an embodiment of the present invention in which a horn 30 is installed on the front surface of the diaphragm, and when the horn is installed, the matching is improved and the volume is greatly increased.

In the case of a conventional speaker, the sound volume becomes smaller when it is moved away from the front axis, and thus, the stereo listening area becomes narrower when listening to the stereo, but the present invention emits the same size sound in all directions of the speaker. Compared with the conventional case, it becomes wider.

In addition, the present invention evenly emits sound in all directions 360 degrees, such as the front side as well as the front side, it is possible to reflect a lot of sound on the wall surface of the room to improve the sense of presence (臨 場 感) significantly.

In addition, the conventional speaker has a disadvantage in that the total sound power output from the speaker is reduced due to the directionality, the higher the treble, the present invention has the advantage that the total sound power output from the speaker is maintained large even in the case of high notes Power response, which is an important factor, is improved, which makes it possible to hear sound with improved balance between high and low frequencies, even in a non-undirected general vision room.

The present invention reproduces the sound evenly in a non-directional direction on the circumferential plane, but has a constant directionality in the up and down direction, the loudest volume on the plane where the voice coil 5 is located, and gradually decreases as the volume is deviated from this plane in the up and down direction. . However, since the height of the listening ear is about 1.0m to 1.5m and there is little variation in the vertical direction, the volume change due to the change in the listening position in the vertical direction is negligible. On the other hand, when the speaker of the present invention is used as a ceiling speaker, the vertical direction has a great advantage. That is, when the conventional speaker is placed on the ceiling, the loudest volume is heard directly under the speaker, and the volume decreases rapidly as the speaker moves away from the speaker. On the other hand, when the speaker of the present invention is placed on the ceiling, the volume is relatively low directly under the speaker. The farther from the direction, the louder the volume is, and as a result, the volume can be heard evenly in a wide area. Therefore, when the speaker of the present invention is installed in the ceiling of the underground corridor or the train, it is possible to hear the volume evenly in a wide area.

Claims (8)

It is provided with two metal rings (2) and (6) up and down to face each other, and using the bottom plate (1), the center column (3), and the top plate (2)-(1)-(3)- A magnetic force line 20 passing through (7)-(6) is formed, and a circumferentially wound voice coil 5 is formed in the gap between the upper metal ring 6 and the lower metal ring 2 to the terminal 4. Speaker characterized in that the voice coil (5) moves in the radial direction in accordance with the current flowing. The speaker of claim 1, wherein two speakers are stacked up and down, and a diaphragm (8) is used in common. The speaker according to claim 1 or 2, wherein the voice coil (5) is formed to be bent in the radial direction and can move in the radial direction as shown in FIG. The speaker according to claim 1 or 2, wherein the voice coil (5) is formed to be bent in the circumferential direction and is movable in the radial direction as shown in FIG. The voice coil 5 is treated with a rigidly molded rigid part 5a and a flexible part 5b that can be flexibly moved, as shown in FIG. 6, so that the voice coil 5 can move in a radial direction. Speaker. The speaker according to claim 1 or 2, wherein air passages are formed in the center column (3) and the upper plate (7) to allow air to escape to the rear of the diaphragm as shown in FIG. A speaker according to claim 1 or 2, wherein an air passage is formed in the upper plate (7) so that air can escape to the rear of the diaphragm as shown in FIG. The speaker according to claim 1 or 2, wherein a horn (30) is attached to the front surface of the diaphragm (8).