JPS6040076Y2 - speaker - Google Patents

Description

[Detailed explanation of the invention] This invention embeds foamed resin inside the paper cone of the driving speaker to reduce the air chamber between the honeycomb core passive diaphragm placed in the front and limit the high frequency range. This invention relates to a speaker that expands the playback band around frequencies.

Conventionally, as shown in FIG. 1, a center pole 9, a magnet 10, and a plate 11 constitute a magnetic circuit, a frame 16 is attached to the top surface of the plate 11, and the center pole 9 and plate 11 form a magnetic gap. The 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 17, and the voice coil 12 is held at the center by a damper 13 whose periphery is attached to the inner bottom of the frame 16. The periphery of the diaphragm 17 was attached to the outer peripheral edge of the frame 16, and the dustproof cap 14 was attached to the center of the diaphragm 17.

A disk-shaped passive diaphragm 18 made of paper or aluminum is placed in front of the diaphragm 17, and the inner circumferential edge of the annular edge 2 having an arcuate cross section is adhered to the outer periphery of the passive diaphragm 18.
The outer peripheral edge of the frame 16 was attached to an annular restraining plate 7, and the restraining plate 7 was adhered to the outer peripheral edge of the frame 16.

In this case, the vibration of the diaphragm 17 is transmitted to the passive diaphragm 18 through the compliance of the air chamber 19 surrounded by the diaphragm 17, the dustproof cap 14, the restraining plate 7, and the passive diaphragm 18.

For this reason, distortion and sharp peaks near the treble limit frequency of the driving speaker are removed, but the disadvantage is that the treble frequency band becomes smaller, and the bending rigidity of the passive diaphragm is small, causing distortion due to split resonance. It had the drawback of being emitted from low frequency bands.

The present invention was devised to eliminate the above-mentioned drawbacks, and to explain the embodiment shown in the drawings, as shown in FIG. A frame 8 is attached to the top surface, a magnetic gap is formed with a center pole 9 and a plate 11, a voice coil 12 is placed at the center of the magnetic gap, the voice coil 12 is suspended from the center of the truncated conical paper cone 3, and the voice coil 12 is suspended from the center of the truncated conical paper cone 3, and a magnetic gap is formed by a center pole 9 and a plate 11. The voice coil 12 is held at the center by a damper 13 attached to the inner bottom of the frame 8, a dustproof cap 14 is attached to the center of the paper cone 3, and a foamed resin 4 such as urethane or styrene is attached to the inside of the paper cone 3. The outer periphery of the edge 6 to be affixed to the peripheral portion of the drive diaphragm 5 formed by embedding is affixed to the outer periphery of the frame 8.

In front of the driving diaphragm 5, a passive diaphragm 1 is arranged in which a disc-shaped nicum core is formed from a light material such as paper or aluminum foil, and a skin material such as paper or aluminum foil is attached to both sides of the passive diaphragm 1. Attach the inner periphery of edge 2 to the outer periphery of plate 1,
In this speaker, a restraining plate 7 is inserted and pasted between the outer periphery of the edge 2 and the outer periphery of the edge 6.

Since the speaker of the present invention has the above structure, the vibration of the driving diaphragm 5 causes vibration through the compliance of the air chamber 15 surrounded by the diaphragm 5, the diaphragm 1, the edges 2, 6, and the restraining plate 7. , vibrations are transmitted to the passive diaphragm 1.

Since the air chamber 15 is made smaller, the reproduction band near the upper limit frequency is expanded.

Also, since the passive diaphragm is made of a honeycomb core, the rigidity per unit is strong, and the divided resonance frequency is generated in a frequency band higher than the usage band, which prevents the generation of distorted sound in the usage band. It is.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional speaker, and FIG. 2 is a sectional view of the speaker of the present invention. 1 is a passive diaphragm, 2 and 6 are edges, 3 is a frustoconical cone paper, 4 is a foamed resin, 5 is a driving diaphragm, 7 is a holding plate, and 8 is a frame.

Claims (1)

[Scope of utility model registration request] A honeycomb core is formed using a light material such as paper or aluminum foil, and the inner periphery of the edge 2 is pasted on the outer periphery of a passive diaphragm 1 on which skin materials such as paper or aluminum foil are pasted on both sides.
Between the outer periphery of the edge 2 and the outer periphery of the edge 6 attached to the periphery of the drive diaphragm 5, which is formed by embedding a foamed resin 4 such as urethane or styrene inside a frustoconical paper cone 3. In this speaker, a restraining plate 7 is inserted and pasted, and the outer peripheral edge of the edge 6 is pasted on the outer peripheral edge of the frame 8.