JP2014039231A - Coaxial speaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem of the incapability of obtaining a favorable radiation characteristic caused by turbulence in a frequency characteristic, directional characteristic, and the like generated by a cavity effect and recess effect in a conventional coaxial speaker where sound of middle and high sound pitch ranges is emitted from the inner part of a recess type diaphragm because a middle and high sound pitch range diaphragm unit is arranged in the inner part of a low sound pitch range diaphragm unit of the recess type diaphragm.SOLUTION: A coaxial speaker has a configuration in which: a diaphragm in a conventional problematic shape is replaced with a convex surface diaphragm; and a middle and high sound pitch range diaphragm is arranged at the center and the top of a low sound pitch range diaphragm and on the same plane. Thereby, occurrence of a cavity effect and recess effect are suppressed; a frequency characteristic and directional characteristic are improved; and favorable characteristics are obtained.

Description

  The present invention relates to a coaxial speaker that provides good sound quality and can be listened to by providing a mid-high range vibration unit at the center of a convex low-frequency range diaphragm.

In the first place, the speaker unit has been demanded as an ideal speaker unit and system with a flat frequency characteristic and a sound source by a point sound source. To realize these, there have been coaxial speakers for a long time.
As a conventional coaxial speaker, many speaker manufacturers in Europe and the United States have manufactured, and the world famous ones are “Tannoy” Monitor Gold, “Altech” 604, “Jensen” 610, In Japan, it was manufactured by Matsushita Electric Industrial Co., Ltd., Pioneer, and several other companies.
(Patent Document 1) (Japanese Patent Application No. 2007-292799) and the like have convex convex coaxial speakers, but the diaphragm positions of the high and low frequencies are not on the same plane, and there are problems such as phase shift.

  In coaxial speakers that have been manufactured in a variety of ways, a mid-high range unit is placed at the back of the center of the low-frequency diaphragm of the concave cone, and the mid-high range is emitted from the back of the concave cone. Disturbances in frequency characteristics were caused by the “cavity effect” and “dimple effect”.

  Although there has been an attempt to improve the disturbance of frequency characteristics with a flat coaxial speaker due to these problems, it has not been solved due to the occurrence of strength problems such as high manufacturing costs and deflection.

Trials such as "cavity effect" and "dimple effect" caused by the concave cone have been attempted by placing the bass unit and the mid-high range unit in the top and bottom of the front and the same-position coaxial arrangement between the flat plate units. Was not reached.
In view of the above problems, the present invention solves the above problems by arranging a mid-high range unit at the center of the convex low range diaphragm.

  The above-mentioned problem due to the arrangement of the mid-high sound unit at the center of the convex low-frequency diaphragm of the present invention improves the dip at the point a in FIG. 2 where the frequency characteristics are greatly swollen as shown in FIG. A flat frequency characteristic like a dot was obtained, and a good acoustic characteristic could be realized in a high sound range by a coaxial sound source. This is a very efficient method of obtaining the various characteristics (frequency flatness, point sound source, phase characteristics, high rigidity) that are required for speakers, and the purpose of the desired effect is accurately achieved. It was done.

  Furthermore, the shape of the diaphragm is only changed from a concave surface or a flat surface to a convex shape, and the conventional speaker unit manufacturing method is utilized as it is, and the cost of the speaker can be reduced without taking any special measures. It can contribute to performance improvement.

It is sectional drawing of this invention coaxial speaker unit. Since it is a circular coaxial, it is a figure of a sectional view.

It is a frequency characteristic table | surface of the conventional concave cone-shaped coaxial speaker unit. Due to the cavity effect, the frequency in the vicinity of about 7 kHz causes a large dip and disturbance.

It is a frequency characteristic table | surface of the coaxial speaker unit of this invention. Although the frame having the same diameter as that in FIG. 2 is used, there is no disturbance near 7 kHz, and the flatness of the frequency characteristics is improved.

  For comparison with FIG. 2, the present invention has a coaxial speaker of the same mouth shape in which a middle high-pitched sound unit is disposed at the back of the center of the conventional concave mortar-shaped diaphragm and a middle high-pitched sound unit disposed at the central portion of the convex-shaped diaphragm of the same mouth shape. The characteristics of the coaxial speaker were measured. A flat characteristic was obtained as shown in FIG.

  It is like the cross-sectional structure of FIG. The mid-high range unit 1 is disposed in the vicinity of the apex with the pole piece 7 as the center, and is appropriately fixed. The low sound range diaphragm 2 is appropriately fixed to the frame 3 via the voice coil bobbin 4, the tapered cone 10, the edge 9, and the damper 5. The low frequency range driving voice coil 6 is located in the gap between the magnet 8 and the pole piece 7 and is operating optimally. Due to this positional relationship, a broadband sound wave having an optimal spherical wavefront is emitted. As shown in FIG. These provide an ideal sound environment for a speaker.

Industrial applicability

  The present invention is an optimal system particularly for studio monitor speakers and the like that require accurate sound quality, and may also be suitable for some high-end audio enthusiasts that require general high-quality audio and ultra-high sound quality.

1, mid-high range unit section 2, convex low-frequency diaphragm 3, speaker unit frame section 4, voice coil bobbin 5, damper section 6, voice coil 7 for low range, low range pole piece 8, low range magnet 9 , Convex low-frequency diaphragm edge 10, convex low-frequency diaphragm support cone a, frequency characteristic dip part b, frequency characteristic dip part improvement characteristic part

Claims (4)

A coaxial speaker, wherein a vibration unit for middle and high frequencies is arranged at the center of a convex low-frequency diaphragm. The coaxial speaker according to claim 1, wherein a vibration unit for middle and high range is arranged at the apex of the convex low range diaphragm. The coaxial speaker according to claim 1, wherein a radius of the diaphragm is smaller in a mid-high range than in a low range. 4. The coaxial speaker according to claim 1, wherein the low-frequency range diaphragm, the speaker main body frame, and the mid-high range are connected to each other by an edge and arranged on the same plane.

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