JPH0518197U - Speaker - Google Patents

Abstract

(57) [Summary] [Purpose] The shape of the sheet member to be attached to the metal cap is devised so as to suppress the occurrence of squeaking in the high frequency range so that the adhesive can dry easily and the weight can be easily changed. As a result, it is possible to provide a speaker that is easily mass-produced and whose sound quality can be easily adjusted. [Structure] An insulating sheet 7 having a through hole 7a and a standing portion 7b provided on an outer peripheral edge thereof is attached to a bottom surface of a metal cap 6,
The rising portion 7b of the insulating sheet 7 was interposed between the outer peripheral edge of the metal cap 6 and the main diaphragm 5.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a speaker also called a dynamic cone speaker, and more particularly to a speaker in which a center cap made of a metal plate is attached to an inner peripheral portion of a main diaphragm having a conical surface.

[0002]

[Prior Art]

 In general, a dynamic cone speaker has a center cap attached to the inner circumference of a main diaphragm with a conical surface to protect the internal magnetic circuit from dust and as a blindfold. When the range reproduction is insufficient, it is possible to raise the high frequency limit of the speaker by using a metal plate center cap (hereinafter abbreviated as metal cap) made of a metal material with a high Young's modulus such as titanium. it can. However, since the metal cap has a small internal loss and a large sharpness Q of resonance, an abnormal noise called "squealing" is likely to occur in the high range, and the lead wire of the voice coil is electrically conductive. Since it is necessary to attach an insulating tape or the like separately in order to prevent a short circuit with the metal cap, the assembly workability deteriorates.

Therefore, as disclosed in Japanese Utility Model Laid-Open No. Sho 62-109592, a method is proposed in which the generation of squeal is suppressed by applying a resin film to the bottom surface of the metal cap to increase the internal loss. Has been done.

[0004]

[Problems to be solved by the device]

 However, the above-mentioned conventional proposals also have a problem that the mass productivity is poor because a relatively long drying time is required because the adhesive necessary for attaching the resin film to the metal cap is covered with the resin film and is difficult to dry. Also, if a resin film is attached and the vibration system becomes too heavy, the high-frequency limit frequency may drop significantly and the sound quality may deteriorate, but the conventional proposal had the problem that adjustment was not easy. .

Therefore, an object of the present invention is to solve the above-mentioned problems of the prior art and to provide a speaker with good mass productivity and easy adjustment of sound quality while suppressing the occurrence of squeaking that is a concern with a metal cap. Especially.

[0006]

[Means for Solving the Problems]

 The above-mentioned object of the present invention is to attach an insulating sheet having a through hole and an upright portion at the outer peripheral edge to the bottom surface of the metal cap, and between the outer peripheral edge of the metal cap and the main diaphragm. This is achieved by interposing the rising portion of the insulating sheet.

[0007]

[Action]

 According to the above means, the adhesive necessary for attaching the insulating sheet to the metal cap is easily dried due to the presence of the through holes, so that the drying time can be shortened, and the size and number of the through holes can be changed. If this is done, the weight of the vibration system can be adjusted, making it easy to adjust the sound quality.Because the rising part is provided on the insulating sheet, the lead wire of the voice coil passing near the outer peripheral edge of the metal cap is There is no risk of short-circuiting with the cap.

[0008]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of a speaker according to an embodiment of the present invention, and FIG. 2 is a characteristic diagram showing a sound pressure level of the speaker in comparison with a conventional product.

In the dynamic cone speaker shown in FIG. 1, a ring-shaped magnet 3 is interposed between a yoke 1 on which a center pole 1a is erected and a top plate 2, and a magnetic circuit is formed. A voice coil 4 of a vibration system is inserted in a gap G formed around the pole 1a. The voice coil 4 is a main diaphragm 5 made of cone paper and having a conical surface, or a main diaphragm 5 The bowl-shaped metal cap 6 attached to the inner peripheral portion of is vibrated. On the bottom surface of the metal cap 6, a paper sheet 7 having a through hole 7a in the center is attached, and the metal cap is formed by an annular standing portion 7b provided on the outer peripheral edge of the paper sheet 7. By surrounding the outer peripheral edge of the metal cap 6, that is, by placing the upright portion 7b between the outer peripheral edge of the metal cap 6 and the main diaphragm 5, the voice coil 4 passing near the outer peripheral edge of the metal cap 6 A short circuit between the lead wire and the metal cap 6 is prevented. In the figure, reference numeral 8 indicates a frame that supports the outer peripheral end of the main diaphragm 5 via a cone edge 9, reference numeral 10 indicates a gasket, and reference numeral 11 indicates a damper. The central portion on the inner peripheral side of the is supported by the frame 8 via the damper 11, and the frame 8 is fixed to the top plate 2.

In the above-mentioned speaker, the paper sheet 7 is attached to the bottom surface of the metal cap 6, so that it is possible to suppress the generation of squeal in the high frequency range. Since the weight of the vibration system can be adjusted by changing the size of 7a, the sound quality can be easily adjusted. That is, in FIG. 2, in the case of the conventional product (indicated by the broken line in the figure) that uses the metal cap alone, the internal loss is small, so squeaking occurs in the high range, and the resin film is placed on the bottom of the metal cap. In the case of another conventional product (shown by a chain line in the figure) that is adhered, although the squeaking is suppressed, the high-frequency limit frequency is greatly reduced, but in the above-mentioned embodiment, the paper to be adhered to the metal cap 6 is used. Since the through-hole 7a is provided in the sheet 7 to prevent the vibration system from becoming too heavy, as shown by the solid line in the figure, the squeaking is suppressed and the high limit frequency is almost low. A speaker with excellent sound quality that cannot be lowered is obtained.

In addition, in the above-described embodiment, the adhesive required for attaching the paper sheet 7 to the metal cap 6 is easy to dry due to the presence of the through holes 7a, and the drying time can be shortened. There is no fear of causing a short circuit, and since the lead wire of the voice coil 4 and the metal cap 6 can be reliably prevented from being short-circuited by the standing portion 7b of the paper sheet 7, there is no fear of impairing the assembling workability. As a result, a speaker that uses the metal cap 6 while suppressing the cost increase as much as possible is obtained.

The size, number, opening position, etc. of the through holes 7a can be appropriately selected. For example, a plurality of through holes 7a having a diameter smaller than that of the above-described embodiment are dispersed and opened in the paper sheet 7. May be. Further, even if a through hole is opened in an insulating sheet made of a material other than paper and the sheet is attached to the bottom surface of the metal cap 6, substantially the same effect can be expected.

[0014]

[Effect of the device]

 As described above, according to the present invention, since the through holes are formed in the insulating sheet to be attached to the bottom surface of the metal cap, the drying time of the adhesive can be shortened and the size of the through holes can be reduced. By adjusting the weight, the weight of the vibration system can be adjusted. Therefore, it is possible to provide a speaker with good mass productivity and easy sound quality adjustment while suppressing the generation of squeaking that is a concern for metal caps with the insulating sheet. You can

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a speaker according to an embodiment of the present invention.

FIG. 2 is a characteristic diagram showing a sound pressure level of the speaker in comparison with a conventional product.

[Explanation of symbols]

 4 Voice coil 5 Main diaphragm 6 Metal cap (center cap) 7 Paper sheet (insulating sheet) 7a Through hole 7b Standing part

Claims (1)

[Scope of utility model registration request] 1. A speaker in which a center cap made of a metal plate is attached to an inner peripheral portion of a main diaphragm having a conical surface to increase a high frequency limit frequency, a through hole is formed and an upright portion is provided on an outer peripheral edge. A speaker characterized in that an insulating sheet is attached to the bottom surface of the center cap, and the standing portion of the insulating sheet is interposed between the outer peripheral edge of the center cap and the main diaphragm.