JPH11164393A - Loudspeaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a loudspeaker with excellent acoustic characteristics when the loudspeaker is used for various kinds of electroacoustic transducers. SOLUTION: In the loudspeaker, a damper is stuck to a frame 4 without exerting affection of adhesive 8 on a corrugation part 7a by forming a laminated margin part for sticking with larger thickness than a part to form the corrugation part 7a by forming the margin parts for sticking with double-layer structure as an upper margin part 11 for sticking and a lower margin part 12 for sticking at the periphery of the damper 7. Thus, the damper is stuck to the frame 4 with the adhesive 8 irrespective of variation in assembly, amplitude quantity and lower frequency region reproducing limit are sufficiently extended and performance with lower distortion and high linearity and excellent acoustic performance are realized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker used for various kinds of audio equipment.

[0002]

2. Description of the Related Art In recent years, digital signal processing technology has dramatically advanced, and the quality of electric signals supplied to speakers has been greatly improved. Accordingly, development of speakers capable of reproducing high sound quality has been strongly desired. ing.

A conventional technique will be described with reference to a speaker shown in FIG. FIG. 3 is a side sectional view of a conventional speaker. In the figure, 1 is a bottom plate having a center pole, 2 is a ring-shaped magnet fixed to the bottom plate 1, and 3 is a top plate fixed to the upper surface of the magnet 2. Reference numeral 4 denotes a frame connected to a magnetic circuit formed by the bottom plate 1, the ring-shaped magnet 2, and the top plate 3.

[0005] Reference numeral 5 denotes a voice coil held in a magnetic gap formed by the inner periphery of the top plate 3 and the outer periphery of the center pole of the bottom plate 1, and 6 has a corrugation portion 6 a fixed to the voice coil 5. Reference numeral 6b denotes a damper, and reference numeral 6b denotes a sticking portion formed integrally with the damper 6 formed on the outer periphery of the damper 6, reference numeral 8 denotes an adhesive for fixing the sticking portion 6b of the damper 6 to the frame 4, and reference numeral 9 denotes a boil coil 5. The diaphragm is fixed to the tip of the. Reference numeral 10 denotes a dust cap attached to the upper surface of the center of the diaphragm 9.

The operation of the conventional loudspeaker configured as described above will be described below. First, when an electric signal is applied to the voice coil 5 of the speaker, a driving force is generated in the voice coil 5 by the magnetic flux of the magnetic circuit. The driving force of the voice coil 5 vibrates the diaphragm 9 fixed to the tip of the voice coil 5, and emits a sound corresponding to the vibration. In order to maintain the amplitude and linearity at the time of this vibration, a sticking portion 6b provided on the outer periphery of the damper 6 supporting the voice coil 5 is fixed to the frame 4 with an adhesive 8, thereby maintaining the performance and reliability. Was secured.

[0006]

However, in the above-described conventional configuration, when the amplitude and the low-frequency reproduction limit are to be improved, the damper 6 fixed to the inside of the speaker frame 4 is required.
It is necessary to increase the area of the sticking portion 6b provided on the outer periphery of the damper 6 so as to be able to withstand the amplitude, and to secure the frame 4 with a large amount of the adhesive 8. However, the adhesive 8 may flow into the damper 6 or permeate and harden the damper 6 due to a variation in the amount of the adhesive 8 applied or a variation in the application position. In addition to decreasing the distortion and increasing the distortion, the amplitude amount and the low-frequency reproduction limit are narrowed, and the input resistance is reduced, which makes it difficult to maintain the performance and maintain the reliability at the time of high input.

The present invention solves the above-mentioned conventional problems, and can fix the adhesive to the frame with a small amount of the adhesive regardless of variations in assembly, thereby achieving a sufficient amplitude and an expansion of the low-frequency reproduction limit. It is an object of the present invention to provide a speaker having excellent acoustic characteristics capable of maintaining a structure capable of withstanding a high input and a high output sound pressure level, and realizing high linearity performance with low distortion.

[0008]

In order to solve the above-mentioned problems, in the speaker according to the present invention, a portion of the speaker provided on the outer periphery of the damper to be attached to the bottom of the frame is larger than the portion forming the corrugation. By having a thickened laminated part, it can be fixed to the frame without transmitting the effect of the adhesive to the corrugation part of the damper, and the adhesive can be fixed to the frame in a small amount regardless of assembly variations. Speaker with excellent acoustic characteristics that can achieve sufficient amplitude, expand the low-frequency reproduction limit, maintain a structure that can withstand high input, maintain a high output sound pressure level, and achieve low distortion and high linearity performance Can be provided.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The speaker according to the first aspect of the present invention is characterized in that a diaphragm, in which a voice coil fitted in a magnetic gap of a magnetic circuit is connected, is mounted on a frame connected to a magnetic circuit. The shape of the sticking part provided on the outer periphery of the damper with the inner peripheral part connected to the coil is thicker than the part forming the corrugation part. Attaching a damper to the frame without transmitting it to the frame, sufficient amplitude and low-frequency reproduction limit can be expanded, a structure that can withstand high input and a high output sound pressure level can be maintained, realizing low distortion and high linearity performance An object of the present invention is to provide a speaker having excellent acoustic characteristics.

An embodiment of the speaker according to the present invention will be described below with reference to FIGS. FIG. 1 is a side sectional view of a speaker according to an embodiment of the present invention, and FIG. 2 is a characteristic diagram of a sound pressure frequency characteristic and a second harmonic distortion characteristic. According to FIG. 1, 1 is a bottom plate having a center pole, 2 is a ring-shaped magnet, and 3 is a ring-shaped top plate, which constitutes a magnetic circuit. Reference numeral 4 denotes a frame connected to the magnetic circuit, 5 denotes a voice coil inserted into a magnetic gap of the magnetic circuit, and 7 denotes a corrugation section 7a.
8 is an adhesive for joining the damper 7 to the frame 4, 9 is a diaphragm that couples the voice coil 5 to the center part, and a peripheral part is coupled to the frame 4, and 10 is a central part of the diaphragm 9. A dust cap 11, an upper sticking portion formed on the outer periphery of the damper 7, and a lower sticking portion 12 integrated with the damper 7 are fixed to the frame 4 using an adhesive 8.

In this embodiment, the shape of the sticking portion provided on the outer periphery of the damper 7 has a two-layer structure of an upper sticking portion 11 and a lower sticking portion 12, which is smaller than that of the corrugated corrugation portion 7a. By having a thickness and further laminating, the influence of the adhesive 8 can be absorbed by the lower bonding margin 12 and transmitted to the corrugation 7a with a small area.
Irrespective of assembly variations, a small amount of the adhesive 8 can be fixed to the frame 4 with a small amount, so that a sufficient amplitude and a low-frequency reproduction limit can be expanded, and a structure capable of withstanding high input. And a high output sound pressure level can be maintained, and a speaker having low distortion and high linearity performance can be provided.

FIG. 2 shows the sound pressure frequency characteristic and the second harmonic distortion characteristic of the conventional speaker and the speaker of the present embodiment. The speaker of the present embodiment has the conventional structure in a low frequency band. It is confirmed that the sound pressure frequency characteristic 13 is higher than the sound pressure frequency characteristic 14 of the speaker, and the second harmonic distortion characteristic of the present embodiment 15 It has been confirmed that high linearity can be obtained by realization.

In the above-described embodiment, the side sectional view and the description have been made with reference to a speaker having a circular shape. However, a similar effect can be obtained with a speaker having an oval or elliptical shape. Also, in the present embodiment, the damper 7 is formed by integrally forming the upper pasting margin 11 and the lower pasting margin 12. However, the upper pasting margin 11 and the lower pasting margin 11 are formed by using two-color molding of different materials. The same effect can be obtained even if the substitute portion 12 is formed.

[0014]

As described above, according to the present invention, the shape of the sticking portion provided on the outer periphery of the damper is further laminated to be thicker than the portion forming the corrugation portion.
Without transmitting the effect of the adhesive to the corrugation
Regardless of variations in assembly, it can be fixed to the frame with a small amount of adhesive, sufficient amplitude and expansion of the low frequency reproduction limit can be achieved, a structure that can withstand high input and a high output sound pressure level can be maintained, A speaker having excellent acoustic characteristics capable of realizing high linearity performance with low distortion can be realized.

[Brief description of the drawings]

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

FIG. 2 is a characteristic diagram of the same sound pressure frequency characteristic and second harmonic distortion characteristic.

FIG. 3 is a side sectional view of a conventional speaker.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bottom plate 2 Magnet 3 Top plate 4 Frame 5 Voice coil 7 Damper 7a Corrugation part 8 Adhesive 9 Diaphragm 11 Upper pasting margin 12 Lower pasting margin

Claims (1)

[Claims] 1. A diaphragm, in which a voice coil fitted in a magnetic gap of a magnetic circuit is coupled, is mounted on a frame coupled to the magnetic circuit, and at least an inner periphery is coupled to the voice coil and an outer periphery is fixed to a bottom surface of the frame. A speaker in which the sticking portion of the fixed portion of the damper is a stacked sticking portion having a thickness greater than that of the portion forming the corrugation portion.