US3617653A — Magnetic reed type acoustic transducer with impro…

Claim 1

Independent Claim 205 words

A magnetic transducer comprising an armature; a pair of magnets having a working gap therebetween; a high magnetic permeability casing member interconnecting said pair of magnets; said armature having a substantially planar first portion compliant in flexure and extending into the working gap, said first portion extending substantially perpendicularly from an intermediate substantially planar portion compliant in torsion, said intermediate portion being within said casing member and spaced therefrom along parallels to the plane of said first portion, and further portions at each end of the intermediate portion and extending substantially perpendicularly from said intermediate portion in respective planes substantially at right angles to the plane of said first portion; each of said further portions having joints of high mechanical rigidity and low magnetic reluctance with said casing member; said first, intermediate and further portions each being of high magnetic permeability material, the intermediate portion being limited substantially to magnetic signal flux paths which are not also polarizing flux paths, and the first portion being limited substantially to said signal flux paths except within the working gap; said intermediate portion having sufficient ductility to enable permanent adjustment of the position of said first portion in said gap by torsional inelastic deformation of the intermediate portion.

Claim 2

Dependent Claim 205 words

A magnetic transducer comprising an armature; a pair of magnets having a working gap therebetween; a high magnetic permeability casing member interconnecting said pair of magnets; said armature having a substantially planar first portion compliant in flexure and extending into the working gap, said first portion extending substantially perpendicularly from an intermediate substantially planar portion compliant in torsion, said intermediate portion being within said casing member and spaced therefrom along parallels to the plane of said first portion, and further portions at each end of the intermediate portion and extending substantially perpendicularly from said intermediate portion in respective planes substantially at right angles to the plane of said first portion; each of said further portions having joints of high mechanical rigidity and low magnetic reluctance with said casing member; said first, intermediate and further portions each being of high magnetic permeability material, the intermediate portion being limited substantially to magnetic signal flux paths which are not also polarizing flux paths, and the first portion being limited substantially to said signal flux paths except within the working gap; said intermediate portion having sufficient ductility to enable permanent adjustment of the position of said first portion in said gap by torsional inelastic deformation of the intermediate portion.

Claim 3

Dependent Claim 22 words

A magnetic transducer as in claim 1 further comprising an electrical signal coil through which extends said first portion of said armature.

Claim 4

Dependent Claim 26 words

A magnetic transducer as in claim 2 wherein each of said joints is near the end of each further portion and remote from said intermediate portion.

Claim 5

Dependent Claim 30 words

A magnetic transducer as in claim 2 wherein said joints are adjacent the ends of said intermediate portion, whereby said intermediate portion essentially bridges directly across within said casing member.

Claim 6

Dependent Claim 38 words

A transdUcer as in claim 2 wherein an L-shaped piece comprises said first portion, with the leg of the L extending through said intermediate portion and the foot of the L facing and attached to said intermediate portion.

Claim 7

Dependent Claim 67 words

A transducer as in claim 5 further comprising a filler piece attached to said intermediate portion complementary to said foot of said L-shaped piece, and an adjusting pad located on said foot and said filler piece, the position of said first portion in said gap being adjustable by way of said adjusting pad when engaged by a tool suitable to exert sufficient torque on said intermediate portion.

Claim 8

Dependent Claim 40 words

A transducer as in claim 2 wherein a T-shaped piece comprises said first portion, with the leg of the T extending from said intermediate portion and the head of the T extending contiguous with and attached to said intermediate portion.

Claim 9

Dependent Claim 32 words

A transducer as in claim 7 wherein said leg extends through the intermediate portion and said head is on the face of the intermediate portion opposite that from which the leg extends.

Claim 10

Dependent Claim 51 words

A magnetic transducer as in claim 1 further comprising an adjusting pad adjacent the face of the intermediate portion opposite that from which said first portion extends, the position of said first portion in said gap being adjustable by inelastic twisting of said intermediate portion by way of said adjusting pad.

Claim 11

Dependent Claim 152 words

A magnetic transducer comprising an electrical signal coil, means for establishing a magnetic field across a working gap comprising a pair of magnets and a high magnetic permeability casing member associated with said magnets, and an armature comprising a generally U-shaped armature yoke and an armature leg, said armature yoke comprising a pair of arms and a connecting crosspiece, said armature leg having a substantially planar portion which extends from said working gap through said coil to the crosspiece of said armature yoke, wherein said crosspiece lies in a plane perpendicular to the plane of said portion, and the arms of said armature yoke each lie in a plane perpendicular to the plane of the crosspiece as well as perpendicular to the plane of said portion, and extend parallel to the plane of said portion, said crosspiece and armature leg being supported within and spaced from said casing member by said arms.

Claim 12

Dependent Claim 152 words

A magnetic transducer comprising an electrical signal coil, means for establishing a magnetic field across a working gap comprising a pair of magnets and a high magnetic permeability casing member associated with said magnets, and an armature comprising a generally U-shaped armature yoke and an armature leg, said armature yoke comprising a pair of arms and a connecting crosspiece, said armature leg having a substantially planar portion which extends from said working gap through said coil to the crosspiece of said armature yoke, wherein said crosspiece lies in a plane perpendicular to the plane of said portion, and the arms of said armature yoke each lie in a plane perpendicular to the plane of the crosspiece as well as perpendicular to the plane of said portion, and extend parallel to the plane of said portion, said crosspiece and armature leg being supported within and spaced from said casing member by said arms.

Claim 13

Dependent Claim 23 words

A magnetic transducer as in claim 10 wherein each of said arms is connected by a low reluctance joint with said casing member.

Claim 14

Dependent Claim 211 words

A magnetic transducer comprising a pair of magnets having a working gap therebetween and providing magnetic polarizing flux thereto; an electrical signal coil; an armature extending from said gap through said coil and comprising a vibratable first portion lying substantially in a first plane, compliant in flexure and extending transversely from a vibratable intermediate portion compliant in torsion, said intermediate portion lying substantially in a second plane perpendicular to said first plane and extending to a juncture with a further portion of said armature in a direction along the intersection of said first and second planes; and a high magnetic permeability casing member forming a partial enclosure for said magnets, coil and first portion and conducting at least a portion of said polarizing flux, said further portion extending to a connection with said casing member; said armature intermediate portion being spaced from but substantially partitioning said casing member and completing a portion of said enclosure, and being supported by said casing member to render said intermediate portion substantially rigid with respect to translation normal to the plane of said first portion; and means for intercepting stray magnetic signal flux of any origin which otherwise would traverse the interior of the casing member where partitioned, said means comprising said armature intermediate portion.

Claim 15

Dependent Claim 211 words

A magnetic transducer comprising a pair of magnets having a working gap therebetween and providing magnetic polarizing flux thereto; an electrical signal coil; an armature extending from said gap through said coil and comprising a vibratable first portion lying substantially in a first plane, compliant in flexure and extending transversely from a vibratable intermediate portion compliant in torsion, said intermediate portion lying substantially in a second plane perpendicular to said first plane and extending to a juncture with a further portion of said armature in a direction along the intersection of said first and second planes; and a high magnetic permeability casing member forming a partial enclosure for said magnets, coil and first portion and conducting at least a portion of said polarizing flux, said further portion extending to a connection with said casing member; said armature intermediate portion being spaced from but substantially partitioning said casing member and completing a portion of said enclosure, and being supported by said casing member to render said intermediate portion substantially rigid with respect to translation normal to the plane of said first portion; and means for intercepting stray magnetic signal flux of any origin which otherwise would traverse the interior of the casing member where partitioned, said means comprising said armature intermediate portion.

Claim 16

Dependent Claim 206 words

An electromechanical transducer comprising, in combination, means forming a housing for said transducer, an armature yoke, said yoke beIng formed of material having a substantially rectangular cross section and being of generally U-shaped configuration comprising a pair of arms and a connecting crosspiece, each bend between the arms and the crosspiece of said U-shaped armature yoke being about an axis parallel to the longer dimension of said cross section, means securing said armature yoke to said housing at a face of each of said arms, an armature leg of substantially rectangular cross section, means securing one end of said armature leg to the crosspiece of said armature yoke, said armature leg extending from said crosspiece in the general direction of the arms of said armature yoke, and said armature leg being positioned on said crosspiece such that the wider dimension of the cross section of said armature leg is along the direction of extent of said crosspiece of said armature yoke, permanent magnets within said housing for providing polarizing flux across a working gap, a portion of said armature leg extending into said working gap, an electrical coil about a portion of said armature leg, and means connected to said armature leg for mechanical displacement therewith.

Claim 17

Dependent Claim 206 words

An electromechanical transducer comprising, in combination, means forming a housing for said transducer, an armature yoke, said yoke beIng formed of material having a substantially rectangular cross section and being of generally U-shaped configuration comprising a pair of arms and a connecting crosspiece, each bend between the arms and the crosspiece of said U-shaped armature yoke being about an axis parallel to the longer dimension of said cross section, means securing said armature yoke to said housing at a face of each of said arms, an armature leg of substantially rectangular cross section, means securing one end of said armature leg to the crosspiece of said armature yoke, said armature leg extending from said crosspiece in the general direction of the arms of said armature yoke, and said armature leg being positioned on said crosspiece such that the wider dimension of the cross section of said armature leg is along the direction of extent of said crosspiece of said armature yoke, permanent magnets within said housing for providing polarizing flux across a working gap, a portion of said armature leg extending into said working gap, an electrical coil about a portion of said armature leg, and means connected to said armature leg for mechanical displacement therewith.

Claim 18

Dependent Claim 19 words

An electromechanical transducer as in claim 13 wherein said means connected to said armature leg comprises acoustic diaphragm means.

Claim 19

Dependent Claim 169 words

A magnetic transducer comprising an electrical signal coil, means for establishing magnetic polarizing flux in a working gap comprising a pair of magnets and a high magnetic permeability casing member associated with said magnets, a high magnetic permeability armature extending through said coil and having a vibratable elongate substantially planar first portion compliant in flexure and extending into said gap, said armature having two further portions extending to connections with said casing member in two regions adjacent the working gap on opposite sides thereof, said connections having low reluctance to magnetic signal flux, said armature having a vibratable intermediate portion within and spaced from said casing member, connected with said first portion and extending between and having opposite ends joined with said further portions to render said intermediate portion substantially rigid with respect to translation normal to the plane of said first portion, said intermediate portion being compliant in torsion about an axis transverse to the direction of extent of said first portion cooperatively with the flexural compliance thereof.

Claim 20

Dependent Claim 169 words

A magnetic transducer comprising an electrical signal coil, means for establishing magnetic polarizing flux in a working gap comprising a pair of magnets and a high magnetic permeability casing member associated with said magnets, a high magnetic permeability armature extending through said coil and having a vibratable elongate substantially planar first portion compliant in flexure and extending into said gap, said armature having two further portions extending to connections with said casing member in two regions adjacent the working gap on opposite sides thereof, said connections having low reluctance to magnetic signal flux, said armature having a vibratable intermediate portion within and spaced from said casing member, connected with said first portion and extending between and having opposite ends joined with said further portions to render said intermediate portion substantially rigid with respect to translation normal to the plane of said first portion, said intermediate portion being compliant in torsion about an axis transverse to the direction of extent of said first portion cooperatively with the flexural compliance thereof.

Claim 21

Dependent Claim 182 words

A magnetic transducer comprising an electrical signal coil, means for establishing magnetic polarizing flux in a working gap comprising a pair of magnets and a high magnetic permeability casing member associated with said magnets, a high magnetic permeability armature extending through said coil and having a vibratable elongate substantially planar first portion compliant in flexure and extending into said gap, said armature having a vibratable intermediate portion within and spaced from said casing member, said first portion extending from and being connected with said intermediate portion in a region between opposite ends thereof, said armature having two further portions joined to said opposite ends of said intermediate portion and extending directly to connections with the casing member at the vicinity of their junctures with the intermediate portion, the connections to said casing member having low reluctance to magnetic signal flux, said intermediate portion being substantially rigid with respect to translation normal to the plane of said first portion and being compliant in torsion about an axis transverse to the direction of extent of said first portion cooperatively with the flexural compliance thereof.

Claim 22

Dependent Claim 182 words

A magnetic transducer comprising an electrical signal coil, means for establishing magnetic polarizing flux in a working gap comprising a pair of magnets and a high magnetic permeability casing member associated with said magnets, a high magnetic permeability armature extending through said coil and having a vibratable elongate substantially planar first portion compliant in flexure and extending into said gap, said armature having a vibratable intermediate portion within and spaced from said casing member, said first portion extending from and being connected with said intermediate portion in a region between opposite ends thereof, said armature having two further portions joined to said opposite ends of said intermediate portion and extending directly to connections with the casing member at the vicinity of their junctures with the intermediate portion, the connections to said casing member having low reluctance to magnetic signal flux, said intermediate portion being substantially rigid with respect to translation normal to the plane of said first portion and being compliant in torsion about an axis transverse to the direction of extent of said first portion cooperatively with the flexural compliance thereof.

Claim 23

Dependent Claim 185 words

A magnetic transducer comprising an electrical signal coil, a high magnetic permeability armature extending through said coil and having a vibratable first portion compliant in flexure, said first portion lying substantially in a first plane and extending into a working gap, and means for establishing magneTic polarizing flux in said gap comprising a pair of magnets and a high magnetic permeability member conducting at least a portion of said polarizing flux; said armature having a vibratable intermediate portion connected with said first portion, said intermediate portion lying substantially in a second plane perpendicular to said first plane and extending to a juncture with a further portion of said armature in a direction along the intersection of said first and second planes; said further portion extending to a connection with said member, said connection having low reluctance to magnetic signal flux, said further portion rendering said intermediate portion substantially rigid with respect to translation normal to the plane of said first portion, said intermediate portion being compliant in torsion about an axis along said direction of extent cooperatively with the flexural compliance of said first portion.

Claim 24

Dependent Claim 185 words

A magnetic transducer comprising an electrical signal coil, a high magnetic permeability armature extending through said coil and having a vibratable first portion compliant in flexure, said first portion lying substantially in a first plane and extending into a working gap, and means for establishing magneTic polarizing flux in said gap comprising a pair of magnets and a high magnetic permeability member conducting at least a portion of said polarizing flux; said armature having a vibratable intermediate portion connected with said first portion, said intermediate portion lying substantially in a second plane perpendicular to said first plane and extending to a juncture with a further portion of said armature in a direction along the intersection of said first and second planes; said further portion extending to a connection with said member, said connection having low reluctance to magnetic signal flux, said further portion rendering said intermediate portion substantially rigid with respect to translation normal to the plane of said first portion, said intermediate portion being compliant in torsion about an axis along said direction of extent cooperatively with the flexural compliance of said first portion.

Claim 25

Dependent Claim 35 words

A transducer as in claim 17 wherein said intermediate portion is sufficiently ductile to enable permanent adjustment of the position of said first portion in said gap by torsional inelastic deformation of the intermediate portion.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1974-11-01	1975-05-03	1975-11-02	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1978-11-01	1979-05-03	1979-11-02	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1982-11-01	1983-05-03	1983-11-02	$7700.00	Window Closed / Lapsed

Magnetic reed type acoustic transducer with improved armature

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