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The present invention relates to Subika unit 1-, and more particularly to a cone-shaped dynamic
loudspeaker unit that right-hands an elliptical cone diaphragm. The high-fidelity speakers that
are currently in widespread use are dynamic speakers. Among them, it can be said that a coneshaped dive-mixing speaker in which the diaphragm has a cone shape and emits sound directly
from the diaphragm to the space forms the basis of hi-fi reproduction. The dynamic speaker
having an elliptical planar shape of the diaphragm has already been used, because it has such a
D-shape-type dynamix beam force from the viewpoint of design, directivity, and occupied
area on the baffle plate. It is known, but recently, to the front of the elliptical cone diaphragm to
improve acoustical properties. [I-shaped diaphragms have been fixed and developed and used.
Since the rectangular diaphragm attached to the front surface of the elliptical cone diaphragm is
divided into two parts, a portion surrounded by the elliptical cone diaphragm and the other
portion, the resonance point of the rectangular diaphragm ( The number is inevitably two, and it
is not preferable from the point of view of the fish I with six sound tube characteristics
improvement. The present invention has been made in view of the above-described point, and
one of its objects is to provide a speaker with excellent acoustic characteristics. In the speaker
cones 1 to 1 according to the present invention, an elliptical cone diaphragm and a front surface
portion of the 4f ′ ′ circular cone diaphragm having a longitudinal center line substantially
coinciding with a major axis direction central axis of the elliptical cone diaphragm The
fundamental resonance frequencies of a portion which is fixed to the rectangular diaphragm and
which is surrounded by the elliptical cone diaphragm and a portion which is not surrounded are
substantially equal. Hereinafter, a speaker unit according to an embodiment of the present
invention will be described with reference to the drawings. The speaker unit is bonded to the
elliptical cone diaphragm 1 and the front surface all of the cone diaphragm along the entire front
edge of the cone diaphragm, for example, as shown by J3 in FIG. 2 of the attached drawings. The
right side of the rectangular diaphragm 2 fixed by the agent or the like and the frame 3 arranged
to cover the cone diaphragm 1 and the rectangular diaphragm 2 from the rear side. The rear end
of the frame 3 is fixed by caulking to the sleeve play 1-4, and is connected to the peripheral edge
2a of the rectangular diaphragm 2 via the front end inner circumferential surface C of the groove
via the edge member 5 having a substantially wedge-shaped cross section. It is being done. An
outwardly extending flange portion 3a is formed at the front end portion of the frame 3 and is
J3. The speaker unit 1- is screwed with the flange portion 3a to a predetermined speaker cabinet,
etc. It is attached to the
As is particularly apparent in FIG. 3, a pair of substantially rectangular openings 3m are formed
on the back of the frame 3. A terminal plate 6 is provided at the edge of the opening 3b. Further,
as shown in FIG. 2, a pair of 44 substantially triangular openings 3C are formed on the upper and
lower surfaces of the frame 3 respectively, and a substantially rectangular small opening is
formed at the outer end of each opening 33C. 3d is continuous. The small opening 3 d is
designed to insert, for example, a jig of two trees when the speaker unit is manufactured, and
when the rectangular diaphragm 2 is adhered to the front surface portion of the cone diaphragm
1. The pressing force of J is supported by the jig. In the speaker unit, a magnifier 1-7, a ball yoke
8 and a damper 9 are described as usual. Here, a method of setting the basic resonance
frequency of the rectangular diaphragm 2 will be described. First, assuming that the fundamental
resonance frequency of the portion of the rectangular diaphragm 2 surrounded by the cone
diaphragm 1 is 1 , f + = 12t p 1− (f 2 / ab (1) It is approximated as Where: a: cone diameter
of the long diaphragm of the cone diaphragm 1 :: density of the rectangular diaphragm 2 Q: same
as above Young's modulus σ: (tf J on Poisson's ratio α: constant according to the value of b / a
If the fundamental vibration frequency of the portion not enclosed by J in the cone diaphragm 1
among 2 is represented by fl, it is approximated as fl-βπ QK '/, Qn Qa 2 (2) Ru. However, Qa = a
radius of rotation of the rectangular diaphragm 2: a constant radius of −4. First, the major
diameter a and the minor diameter S of the elliptical shape are determined, and the value of α is
measured. In particular, pa and tlb (the short dimension of the rectangular diaphragm 2) are
determined for the rectangular diaphragm punched with a hole of the shape of 惰 11 , and
the value of β is measured. After that, the values of a, b and Qa are appropriately selected and
selected in the experiment so that the value of [f 2] becomes equal. However, as described above
<b / a and (il +, I! Keep the value of a constant. In the speaker unit thus obtained, each group 4 of
the rectangular diaphragm 2 and the portion not enclosed by the cone diaphragm 1 by the cone
diaphragm 1 (resonance frequencies substantially coincide and the number of resonance points
is one. As described above in detail, in the speaker unit 1 according to the present invention, the
fundamental resonance frequencies of the portion surrounded by the elliptical cone diaphragm
of the rectangular diaphragm and the portion not surrounded are substantially equal J. . The
acoustic characteristics are improved and it is ° C.
Brief description of the drawings
FIG. 1 is a plan view of a speaker according to the present invention: 1 to 1; FIG. 2 is a w-view
including a partial cross section of the speaker unit i to FIG. 3 is a rear view of the speaker unit.
Description of the sign of the main part 1 ......... elliptical cone diaphragm 2 ...... rectangular
diaphragm applicant Pioneer Attorney Attorney FujiToshi Motohiko (outer one person)
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