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JPS5286325

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DESCRIPTION JPS5286325
Description of the Invention Ribbon Speaker A permanent magnet (2) constituting a magnetic
circuit and an acoustic reproduction ribbon (1) and a conductive layer respectively attached
thereto! r (A, each acoustic reproduction ribbon (1) is placed in one space between the pole faces
of the permanent magnet (2), and the thickness of the layer is the thickness of the acoustic
reproduction ribbon (1) A ribbon speaker characterized by increasing from a side d portion of
the permanent magnet (2) in contact with a magnetic pole surface of the permanent magnet (2)
toward a central portion of the acoustic microphone (1).
Claims
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electroacoustic
exchanger, and more particularly to a ribbon speaker. The present invention can be employed in
the design of ribbon type electroacoustic transducers such as ribbon speakers. Ribbon speakers
are currently being widely adopted in home sound reproduction devices, speaker systems such as
movie theaters, performance venues, and other places and applications requiring high fidelity
sound reproduction. Ribbon speakers comprising permanent magnets and an acoustically
reproducing ribbon of constant lateral thickness, which is arranged in the working space 1111 of
the pole faces of the permanent magnets, are already known (for example Czechoslovak patent
no. 117,767, U.S. Pat. No. 3,564,63)). The open-ended magnetic induction or flux density
between the pole faces of the permanent magnet is relatively large near the @ pole face but
decreases towards the center of the gap. Therefore, the coercivity acting on the buttocks of the
sound reproduction 11 phone is sufficiently larger than the cardiac magnetic force created in its
central portion. As a result, since the traveling wave is generated along the width direction of the
ribbon, the vibration at any point of the acoustic reproduction ribbon can not be in the same
phase sufficiently. The amplitude of the imaging movement at the edge of the sound
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reproduction ribbon is relatively large, and the imaging movement in which the same phase
relationship is damaged is combined to result in distortion of the reproduction sound.
Furthermore, in this case, the central portion of the sound reproduction ribbon is an edge load,
which also causes the distortion of the reproduction sound EndPage: 1. Finally, since vibrations
are mainly confined to the edge of the ribbon, the 4 # part will always operate under lateral
bending loads, which may shorten the life of the ribbon and may even cause breakage. An
example of a conventional ribbon-type speaker id (see US Pat. No. 3,564,163), the thickness is
vertical as it goes from the central part to the end part, that is, the thickness increases toward the
point supported by the support frame It uses an acoustic playback ribbon that changes in
direction. This structure is entirely intended to prevent the standing wave from being generated
in the acoustic reproduction ribbon by the interference between the direct traveling wave and the
traveling wave reflected from the support point. However, in such ribbon speakers, the ribbon
does not vary in thickness in the lateral or width direction at any given cross section. Thus, this
ribbon speaker can not escape the drawbacks associated with the non-uniformity of the magnetic
flux density in the working gap between the facing pole faces of the permanent magnets. It is an
object of the present invention to provide a ribbon type speaker which improves the quality of
reproduced sound and prolongs the life of the reproduction ribbon.
This object comprises a permanent magnet constituting the magnetic path 11 and an acoustically
reproducing ribbon attached to the lead-in periphery, inserted in the working gap between the
facing pole faces of these permanent magnets, M The thickness of the conductive layer is
achieved by increasing the thickness from the edge of the ribbon near the pole face of the
permanent magnet to the center of the phone or by means of a phone speaker.
Claims
The ribbon-type speaker according to the present invention, which will be described in detail
below with reference to the drawings, has a sound 11 reproduction ribbon 1 disposed in the gap
between the facing magnetic poles N and S of the permanent magnet 2. The magnetic poles N
and S project in a direction perpendicular to the flow direction of the audio current flowing
through the front-plate reproduction ribbon 1. The thickness of the voice reproduction ribbon I is
made to increase from the edge near the magnetic poles N, S toward the center. FIG. 2 is a graph
showing the change in magnetic flux density in the gap between the magnetic poles N and S. As
the value i of the magnetic flux density along the arbitrarily selected generatrix of the acoustic
reproduction ribbon 1 B is the value of the audio current flowing along the same generatrix, the
audio current flowing through the acoustic reproduction ribbon 1 satisfies the condition Biconstant ... ........................... (1) so as to satisfy the variation in the width direction of the guiding s
Tamurodo acoustic endogenous ribbon 1 Since this condition is satisfied in the ribbon speaker
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according to the present invention, the magnitude of the magnetic force at any given point of the
phone is always constant.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view showing an acoustic
reproducing ribbon within the working gap of the ribbon speaker of the present invention, and
FIG. 2 is a graph showing the distribution of magnetic flux density in the gap between 61 pole
faces of permanent magnets. is there. l иииииииииииииииииииииииииииииииииииииииииииииии и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и
ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии
и и и и и и и и и и и и и и и и и Page 4 Afanasi Ewetych Fuerdman Soviet Union Moscow-Urisothua
Dobininskaya 6 Corps 1-269 ? Applicant Ilya Afanasi Ewetysch-Fueldoman Soviet Union
Moscow Uolit Zua-Dubini Sisskaya 6 Corps 1-269EndPage: ?
12-05-2019
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