JPH0619395U - Diaphragm for flat speaker - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a diaphragm for a flat speaker capable of removing the secondary resonance and improving the directional characteristics in the high frequency range. [Arrangement] On the rear surface 8b side of the flat plate-shaped diaphragm 8, the additional position of the weight 15 is A, and the additional position of the weight 15 is B in the radial direction of the diaphragm 8. At this time, the diaphragm 8 is placed at the position of B / A = 0.7 to 0.9.
Is set near the center of gravity of the diaphragm 8 in the front-rear direction and at least four locations at equal intervals in the circumferential direction of the diaphragm 8, and the total weight of the weight 15 is set with respect to the weight of the diaphragm 8. Was set to 0.2 to 1.0 times.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a diaphragm for a flat speaker, which is suitable for a television speaker, a PA speaker (in-place loudspeaker), etc., which is required to stop the secondary resonance and improve the directional characteristic, and which requires particularly high-clarity sound quality. .

[0002]

[Prior art]

 Conventionally, various flat panel dynamic speakers have been proposed, but it is difficult to remove the split resonance peculiar to the flat plate, and the structure for removing this split resonance becomes complicated, and in any case, the cost becomes high, and it is generally popular. Not not.

Conventionally, node drive is often performed in order to remove the secondary resonance.

[0004]

[Problems to be solved by the device]

 The conventional technique for removing the secondary resonance has the effect of removing the secondary resonance, but on the other hand, the drive diameter becomes large, resulting in deterioration of the directional characteristics in the high frequency range.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a diaphragm for a flat speaker capable of removing the secondary resonance and improving the directional characteristics in the high frequency range. It is what

[0006]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention sets an additional position of the weight 15 on the rear surface 8b side of the flat diaphragm 8 and an effective diameter A of the diaphragm 8 in the radial direction of the diaphragm 8, When the additional position of the weight 15 is B, the position of B / A is 0.7 to 0.9, the longitudinal direction of the diaphragm 8 is near the center of gravity of the diaphragm 8, and the diaphragm 8 is in the circumferential direction. Are set at at least four places at equal intervals, and the total weight of the weight 15 is set to 0.2 to 1.0 times the weight of the diaphragm 8.

[0007]

[Action]

 In the present invention, when the additional position of the weight 15 is A in the radial direction of the diaphragm 8 and the additional position of the weight 15 is B, B / A = 0.7 to 0 ． It is set at the position 9 and in the vicinity of the center of gravity of the diaphragm 8 in the front-back direction of the diaphragm 8, which is the optimum position for removing the secondary resonance.

Furthermore, since the weights 15 are added at positions 4 to 16 at equal intervals in the circumferential direction of the diaphragm 8, the optimum position is achieved even for higher-order resonance modes. Becomes

Moreover, the total weight of the weight 15 is set to 0.2 to 1.0 times the weight of the diaphragm 8, and the total weight of the weight 15 is also an optimum weight for removing the secondary resonance. Becomes

As a result, in the present invention, the secondary resonance can be effectively removed, and the directional characteristics in the high frequency range can be remarkably improved.

[0011]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a vertical sectional view showing an embodiment of a speaker using a diaphragm of the present invention, and FIG. 2 is a rear view of the diaphragm.

The speaker shown in FIG. 1 includes an inverted T-shaped yoke 1, a ring-shaped magnet 2 fixed on a flange of the yoke 1, and a plate 3 fixed on the magnet 2. A frame 4 fixed on the plate 3 via a bottom portion, a diaphragm 8 mounted on an upper portion of the frame 4 via an edge 9, a center pole of the yoke 1, a magnet 2 and a plate 3 between them. A voice coil 5 arranged in the magnetic gap, a voice coil bobbin 6 supporting the voice coil 5 and supported by the diaphragm 8, and a voice coil bobbin 6 provided between the outer peripheral portion of the voice coil bobbin 6 and the inner peripheral portion of the frame 4. And a damper 7.

The vibrating plate 8 is formed into a round flat plate shape using a foam material such as styrene. The front side 8a of the diaphragm 8 is formed flat, and the throat section 10, the reinforcing ribs 11a and 11b, the weight reducing holes 12a and 12b, and the outer peripheral side hole 13 are formed on the rear surface 8b side. , Weights 15 are provided.

The throat portion 10 is formed in a truncated cone shape. The reinforcing rib 11a is formed in the throat portion 10 in an annular shape concentric with the diaphragm 8. The reinforcing rib 11b is formed in an annular shape concentric with the diaphragm 8 near the outer peripheral portion of the diaphragm 8. The lightening hole 12a is formed in an annular shape between the reinforcing ribs 11a in the throat portion 10. The lightening holes 12b are formed by arranging triangular holes in a back-to-back manner between the reinforcing ribs 11b near the outer peripheral portion of the diaphragm 8. The outer peripheral hole 13 of the diaphragm 8 is formed by arranging triangular holes, which are slightly larger than the lightening holes 12b, on the circumference in a back-to-back manner.

By the way, the present invention is characterized in that a weight 15 having a set weight is added to a set position on the back surface 8b side of the diaphragm 8, and the added position of the weight 15 is the diaphragm. In the radial direction of 8 as shown in FIG. 1, when the effective diameter is A and the additional position of the weight 15 is B, the front and rear direction of the diaphragm 8 is at the position of B / A = 0.7 to 0.9. (Arrow c in FIG. 1) is added near the center of gravity of the diaphragm 8 and at 4 to 16 places at equal intervals in the circumferential direction of the diaphragm 8. The total weight of the weight 15 is It is set to 0.2 to 1.0 times the weight of the vibration plate 8.

In this embodiment, the weight 15 is attached by using the outer peripheral hole 13. That is, as shown in FIG. 2, mounting bases 14 provided with weights 15 are fitted into eight outer peripheral holes 13 selected at intervals of 45 ° on the circumference, and an arrow c in FIG. It is fixed after adjusting the position in the front-back direction shown in. The attachment base 14 of the weight 15 is formed of the same foam material as that of the diaphragm 8 into a short triangular prism that fits into the outer peripheral hole 13, and is fixed to the diaphragm 8 by adhesion. The weight 15 may be made of metal, plastic, rubber, or the like, but butyl rubber was used for high-order resonance mode, and a good effect was obtained.

Further, in this embodiment, the effective diameter A of the diaphragm 8 is formed to be 2.0 to 3.0 times the diameter of the voice coil 5, and the height of the throat portion 10 is about 0 of the diameter of the voice coil 5. It is formed 5 to 1.5 times.

Further, in this embodiment, the thickness of the diaphragm 8 is set to be 1.8 to 2., which is 0.5 to 0.8 times the effective diameter A of the diaphragm 8 on the rear surface 8b side of the diaphragm 8. A reinforcing rib 11b having a height of 5 times is provided.

In the diaphragm for the flat panel speaker of this embodiment to which the weight 15 is added as described above, since the weight 15 is adjusted to the optimum position and adjusted to the optimum weight, the secondary resonance is generated. It can be effectively removed and can be effectively adjusted even for higher resonance modes.

By the way, FIG. 4 is a diagram showing the directional characteristics of a conventional speaker using a 16 cm cone type diaphragm, and FIG. 5 is a flat plate-shaped weight in the embodiment shown in FIGS. 1 and 2 of the present invention. It is a figure which shows the directional characteristic of the speaker using the added 16 cm diaphragm. From these FIGS. 4 and 5, it can be seen that the directivity characteristic in the high frequency range is remarkably improved according to this embodiment of the present invention.

Further, in this embodiment, the effective diameter A of the diaphragm 8 is formed to be 2.0 to 3.0 times the diameter of the voice coil 5, and the height of the throat portion 10 is set to about 0 of the diameter of the voice coil 5. Since it is formed to be 1.5 times to 1.5 times, the difference in distance from the surface of the diaphragm 8 to the measurement position is smaller than that of a speaker using a cone type diaphragm that is generally used in the past. It is possible to greatly improve the directional characteristics in the musical range.

Further, in this embodiment, the thickness of the diaphragm 8 is 1.8 to 2. The position of the diaphragm 8 is 0.5 to 0.8 times the effective diameter A of the diaphragm 8 on the back surface 8b side. A reinforcing rib 11b having a height of 5 times is provided, and a large number of holes 12b and 13 are formed on the outer peripheral side of the diaphragm 8 including between the reinforcing ribs 11b so that the structure is lightweight and has a large internal loss. Therefore, higher-order resonance can be improved.

Next, FIG. 3 is a partially enlarged sectional view showing another embodiment of the present invention. In the embodiment shown in FIG. 3, a free edge 16 separate from the diaphragm 8 is attached to the upper end of the frame 4, and the diaphragm 8 is supported by the frame 4 via the free edge 16. There is.

The other structure and operation of the embodiment shown in FIG. 3 are the same as those of the embodiment shown in FIGS. 1 and 2.

In the present invention, the weight-reducing hole 12b and the outer peripheral hole 13 provided near the outer peripheral portion of the diaphragm 8 are not limited to the triangular shape shown in FIG. 2, and may be circular or square. Further, the method of adding the weight 15 is not limited to the method of fitting the mounting base 14 into the outer peripheral hole 13 and may be directly mounted at a predetermined position of the diaphragm 8.

[0026]

[Effect of device]

 As described above, in the present invention, on the rear surface side of the flat plate-shaped diaphragm, the additional position of the weight is A, the effective diameter of the diaphragm is A, and the additional position of the weight is B in the radial direction of the diaphragm. At this time, set at B / A = 0.7 to 0.9, near the center of gravity of the diaphragm in the front-back direction of the diaphragm, and at least four locations at equal intervals in the circumferential direction of the diaphragm. In addition, the total weight of the weight is 0.2 to 1. It is set to 0 times, the weight mounting position is the optimum position for removing the secondary resonance, and is also the optimum position for higher-order resonance modes, and the total weight of the weight is also the secondary resonance. Since it is adjusted to the optimum weight to remove the second resonance, it has the effect of effectively and appropriately removing the secondary resonance, and also has the effect of significantly improving the directional characteristics in the high frequency range.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of the present invention.

FIG. 2 is a rear view of the diaphragm used in the embodiment of FIG.

FIG. 3 is a partially enlarged sectional view showing another embodiment of the present invention.

FIG. 4 is a directional characteristic diagram of a conventional speaker using a 16 cm cone type diaphragm.

FIG. 5 is a directional characteristic diagram using a 16 cm flat circular diaphragm of the present invention.

[Explanation of symbols]

 1 yoke 2 magnet 3 plate 4 frame 5 voice coil 6 voice coil bobbin 7 damper 8 diaphragm 8b back surface of diaphragm 10 throat parts 11a, 11b reinforcing ribs 12a, 12b lightening hole 13 outer peripheral hole 14 weight mounting base 15 weights

Claims (1)

[Scope of utility model registration request] 1. A diaphragm for a flat speaker in which a weight (15) is added to a rear surface (8b) side of a diaphragm (8) formed of a foam material into a flat plate round shape, wherein the weight (1
When the effective position of the diaphragm (8) is A and the additional position of the weight (15) is B in the radial direction of the diaphragm (8), B / A = 0.7. At a position of ~ 0.9, in the front-back direction of the diaphragm (8), near the center of gravity of the diaphragm (8),
The diaphragm (8) is set at at least four positions at equal intervals in the circumferential direction, and the total weight of the weights (15) is 0.2 to 1 ... with respect to the weight of the diaphragm (8). A diaphragm for a flat panel speaker, which is set to 0 times.