JPS63278492A - Cone for rectangular speaker - Google Patents

Abstract

PURPOSE:To improve efficiency and to easily and surely join the titled cone with a dust cap, by changing continuously the radius of the inclined arc of the oscillating plane of a pyramidal cone, and making a cone plane light in weight by forming the shape of one flat cross-sectional plane of the cone plane so as to be coaxially with a circular neck part and in a circular shape or an elliptical shape. CONSTITUTION:The radius of the curve of the inclined plane 12 of the pyramidal cone is increased specifically in the center of the side of a major axis part, and is decreased as advancing to a corner part, and the inclination of the center part of the side is formed in an acute angle, and the strength of a peripheral part and a neck part 11 are uniformized in an outer peripheral direction. Also, the shape of a dust cap joint plane is formed in the circular shape or the elliptical shape. Thereby, the strength of the peripheral part of the pyramidal cone is uniformized by keeping plane thickness constant, and the weight of the cone is reduced, and the efficiency can be improved, and the dust cap is formed easy to be set along the cone plane 12, and easy joint can be realized, and superior joint strength and appearance after joining can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a cone for a rectangular cone speaker.

BACKGROUND OF THE INVENTION This type of pyramidal cone has a neck portion 1, as shown in FIG.
Cone surface 2. A structure having an edge portion 3.

It was in shape. That is, the slope of the cone surface 1 is a straight line or the same R1 over the entire circumference, and when shown in the cross section of FIG. It was as shown in the plan.

Problems to be Solved by the Invention However, when the former pyramidal cone shape is used, the difference in strength on the inclined surfaces, especially at the periphery, becomes significant, being stronger at some of the corners of the rectangle and weaker at the center of the sides.

In conical cone speakers, in order to prevent disturbances in sound pressure frequency characteristics and increase in distortion in the natural vibration region that exceeds the piston motion region, the surface thickness in the outer circumferential direction of the cone is uniform, so the strength must be uniform and the surface This is possible if the thickness, material, etc. are appropriate. However, in the case of conventional pyramidal cones, it is necessary to change the thickness, material, etc. in order to make the strength uniform in the circumferential direction of the cone, which is disadvantageous in terms of technology and cost. Therefore, if you try to obtain the necessary strength of the cone by adjusting the surface thickness, the weight relative to the cone area will be larger than that of a conical cone, and the efficiency advantage of a rectangular cone speaker due to the increased radiation area cannot be achieved, or the sound Performance aspects such as pressure frequency characteristics and distortion may be sacrificed.

Also, when joining the dust cap to the cone surface, a constant H
The curved cone has a special shape as shown in the plan view in Figure 2, and the shape of the dust cap may not match the cone surface or may be misaligned during bonding, making it difficult to align with the cone surface, resulting in a decrease in bonding force. or appearance problems.

Therefore, the present invention calculates the local strength difference of the pyramidal cone by the surface thickness.
By reducing the size of the speaker without changing the materials, etc., and reducing the weight of the cone surface, the efficiency advantage of the rectangular cone speaker can be fully demonstrated, and the dust cap and the pyramidal cone can be easily joined.

Means to Solve the Problem In order to solve this problem, the radius of the sloped surface curve of the pyramidal cone is made especially large at the center of the long diameter side, and becomes smaller toward a part of the corner, The central part is sloped at an acute angle, and the strength of the peripheral part and neck part is made uniform in the outer circumferential direction. Moreover, the shape of the dust cap joint surface is circular or oval.

Since the strength of the peripheral part of the action pyramidal cone is made uniform by keeping the surface thickness constant, weight can be reduced and efficiency can be improved. Moreover, the dust cap has a shape that makes it easy to fit on the cone surface, making it easy to join, providing excellent joint strength and appearance after joining.

EXAMPLE A cone of a rectangular cone speaker according to an example of the present invention will be described below.

As shown in FIG. 1, the top of the pyramidal cone is comprised of a neck part 11 that is joined to the voice coil, a pyramidal cone surface 12, and an edge part 13 that is joined to the cone surface. Assuming that the dust cap is joined to the moom' portion of the cross section, the radius R of the cone surface curve is continuously changed so that the planar shape 14 of this portion becomes an ellipse.

The specific shape and dimensions are described below. That is, the shape of the opening of the cone part is a rectangle of 7011111 x 60 mm, and the neck part is a circle of φ14 flf. The height dimension is 15j
l'l, and at a position 6.1 ff from the neck,
If the shape is such that a 30ff x 25ff dust cap is attached, the cone surface inclination is as shown in each cross section, and the radius is large at the center of the long axis and becomes small at the corner. As a result, the strength difference in the peripheral area is reduced to a small level.

Effects of the Invention As described above, the present invention reduces the strength difference between part of the corner and the center of the side of a pyramidal cone, thereby reducing the weight of the cone surface even in a cone with a nearly uniform surface thickness. Therefore, it is superior in terms of efficiency. Furthermore, by forming the joint surface with the dust cap into an elliptical shape, the joint with the dust cap is made easy and reliable, quality and reliability are stabilized, and the appearance of the joint portion is advantageous. Moreover, the conventional oval cone,
Dust caps used for conical cones can be used, reducing speaker development costs.

[Brief explanation of the drawing]

Figures 1a and b are a plan view and a half sectional view of a pyramidal cone of a rectangular cone speaker in an embodiment of the present invention, and Figure 2a is a
-d is a plan view, 0-C sectional view, 0-X sectional view, and 0-C sectional view of a pyramidal cone of a conventional rectangular cone speaker. 11...Neck part, 12...Cone surface, 13...Edge part. Name of agent: Patent attorney Toshio Nakao and 1 other person11
--One-piece part 12・-Cone surface Fig. 1! 3- Esso Club 2nd
Figure KL = KZ”K3

Claims (1)

[Claims] The radius of the inclined arc of the vibration surface of a pyramidal cone with a rectangular opening surface is continuously changed, and the cross-sectional shape of one plane of the cone surface arbitrarily set between the neck part and the edge part is concentric with the circular neck part. Further, a rectangular speaker cone formed to have a circular or oval shape.