JPS6040073Y2 - speaker - Google Patents

Description

[Detailed explanation of the invention] This invention eliminates distortion in the low frequency band and eliminates distortion in the high frequency band by attaching a passive diaphragm made of foamed resin embedded inside a paper cone to the front of the driving speaker. This invention relates to a speaker that eliminates the influence of the concavity effect in sound and expands the reproduction band near the upper limit frequency.

Conventionally, as shown in FIG. 1, a center pole 9, a magnet 10, and a plate 11 constitute a magnetic circuit, a frame 7 is attached to the upper surface of the plate 11, and the center pole 9
, a damper 13 in which a magnetic gap is formed by a plate 11, a voice coil 12 is arranged at the center of the magnetic gap, the voice coil 12 is suspended from the center of the truncated conical diaphragm 6, and the periphery is attached to the inner bottom of the frame 7. The voice coil 12 is held, the periphery of the diaphragm 6 is attached to the outer periphery of the frame 7, and the dustproof cap 14 is attached to the center of the diaphragm 6.

A disk-shaped passive diaphragm 8 made of paper or aluminum is placed on the front surface of the diaphragm 6.The inner periphery of the annular edge 4 having an arcuate cross section is adhered to the outer periphery of the waist passive diaphragm 8, and the outer periphery of the edge 4 is attached to the outer periphery of the passive diaphragm 8. It was attached to an annular retainer ring 5, and the retainer ring 5 was attached to the outer peripheral edge of the frame 7.

In this case, the vibration of the diaphragm 6 passes through the compliance of the air chamber 15 surrounded by the diaphragm 6, the dustproof cap 14, the restraining ring 5, and the passive diaphragm 8, and
Vibration is transmitted to

For this reason, the frequency band in the treble range becomes smaller, but distortion and sharp peaks near the treble limit frequency of the drive speaker are removed.

However, the bending rigidity of the passive diaphragm is low, and distortion due to split resonance occurs in a low frequency band.

The present invention was devised to eliminate the above-mentioned drawbacks, and to explain the embodiment shown in the drawings, as shown in FIG. 2, the speaker drive section is the same as the conventional example, but the diaphragm 6 is The inner periphery of the edge 4 is pasted to the outer periphery of a passive diaphragm 3, which is formed by embedding a foamed resin 2 such as urethane or styrene on the inside of a cone paper 1 in the shape of a truncated cone with a bottom, on the front surface. This is a speaker in which the outer peripheral edge is attached to a restraining ring 5, and the restraining ring 5 is attached to the outer peripheral edge of a frame 7 to which the peripheral part of a truncated conical diaphragm 6 is attached.

Since the speaker of the present invention has the above-described structure, the bending rigidity of the passive diaphragm 3 is determined by the shape of the paper cone, and the divided resonance frequency is generated in a frequency band higher than the operating band.

Therefore, it is possible to prevent the occurrence of distorted sound in the used band.

Foamed resin is used to make flat speakers and has the advantage of being light in weight.

In addition, since the empty chamber 15 is made smaller, it is possible to reproduce higher frequencies, expanding the reproduction band near the upper limit frequency, eliminating the influence of the depression effect in the high frequency band, and producing a substantially flat sound. Frequency characteristics can be obtained.

This invention has good drive force linearity, high efficiency, and
It has great value as a unit with good directionality.

[Brief explanation of the drawing]

Figure 1 is a sectional view of a conventional speaker, Figure 2 is a sectional view of the speaker of the present invention, 1 is a paper cone, 2 is a foamed resin, 3 and 8 are passive diaphragms, 4 is an edge, 5 is a restraining plate, and 6 is a vibration plate. Board, 7 is the frame.

Claims (1)

[Scope of utility model registration request] A passive diaphragm 3 formed by embedding a foamed resin 2 such as urethane or styrene inside a cone paper 1 in the shape of a truncated cone with a bottom.
The inner circumferential edge of the edge 4 is attached to the outer circumference of the speaker.The outer circumferential edge of the waist edge 4 is attached to the annular restraining ring 5 attached to the outer circumferential edge of the frame 7 to which the peripheral part of the drive diaphragm 6 is attached.