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Патент USA US2108275

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Feb. 15, 1938.
?
R. VERMEULEN ET AL_
.
?
2,108,275
ELECTROMAGNETIC DEVICE AND METHOD OF MAKING SAME
Filed April 17, 1955
2 Sheets-Sheet 1
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Feb. 15, 1938.
R, VERMEULEN ET AL
'
2,108,275
ELECTROMAGNETIC DEVICE AND METHOD OF MAKING SAME
Filed April 1:7, 1935
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2,108,275?
Patented Feb. 15, 1938
UNITED STATES
PATENT orrlcs
2,108,275
ELECTROMAGNETIC DEVICE AND METHOD
OF MAKING SAME
Roelof Vermeulen and Arend Thomas Van Urk,
Eindhoven, Netherlands, assignors to N. V.
Philips?
Gloeilampenfabrieken,
Eindhoven,
Netherlands
Application April 17, 1935, Serial No. 16,872
In Germany May 1'7, 1934
6. Claims.
(G1. 179??100.41)
The present invention relates to electromag
netic devices and to methods of making same,
and pertains more particularly to electromag
netic-acoustic devices.
5
The invention will be described in connection
with electromagnetic sound devices for record
ing, but can be also applied to reproducing de
vices, etc.
'
?
Devices according to the invention are espe
10 cially well adapted for use in the method of sound
recording described in U. S. Patent No. 1,919,116
to J.? A. Miller.
In the various electromagnetic devices, for ex
ample loudspeakers, pickups and the like in which
15 an armature moves within a magnetic ?eld cre
ated between pole pieces, it is highly important
for proper operation that the armature be accu
rately spaced from the faces of the pole pieces.
It is also important that the spaces be easily ob
20 tained and once obtained be maintained irre
spective of shocks and vibrations. Furthermore,
it is important that the device be easy to assemble
and disassemble even by not highly skilled per
sons and that the proper distancing of the arma
25 ture from the pole pieces be e?ected without
requiring a special device.
In accordance with the invention the pole
pieces of the device are rigidly secured to mem
bers of nonmagnetic material, which members
30 are provided with surfaces upon which the arma
ture is suspended; the pole faces and the surfaces
of suspension lying in the same plane.
It is necessary that the pole pieces be rigidly
secured to the members of nonmagnetic mate
35 rial so that their relative position thereto will
40
Fig. 4 is a perspective view of one of the pole
pieces shown in Figs. 1 and. 2, and
Fig. 5 is an exploded perspective view of the 10
recorder of Fig. 1 with the coils omitted for sim
plicity.
,
Referring to Figure 1, the electromagnetic re
corder consists of two pole piece assemblies A?A,
each comprising a U-shaped member ?E of non- l5
magnetic material, for instance copper, and is
provided with two plane end-faces 9-9 serving
to support an armature l of magnetic material.
Rigidly secured to each of the members '|?-l?
for instance by screws, clamping, soldering, or 20
welding?is a pole piece 6 (see Fig. 4) of U
shaped cross section and forming two poles I 8-?
18, having pole faces 8?8.
After the pole piece 6 has been secured to the
member ?I, the pole faces 8-8 and the faces 9-?9 25
are ?nished so as to lie in the same plane, this
being preferably effected in a single operation, for
instance?by somilling or grinding the faces 8?8
and 9-9 that they lie exactly in the same plane.
The armature I (see Figs. 3 and 5) is formed of 39
a flat piece of magnetic material of uniform
thickness, for instance of soft iron. Its central
portion 2 is substantially square and projects on
one side in a centrally? extension 3, to which a
recording cutter or needle I6, is removably se- 35
cured by means of a screw H. The square 2 of
the armature I extends on each side into narrow
as to lie in the same plane.
In a particular embodiment of the invention
the armature and its means of suspension form
clearance holes 2ll?2ll.
40
The portions 4-4 serve to provide the torsional
forces to the armature; when in operation the
a single piece of magnetic material of uniform
armature portion 2 tends to vibrate about the
longitudinal axis of the portions 4?4.
to which the pole piece is secured, with the inter
position of suitable spacers. In this embodi
ment of the invention the distance between the
the thickness of the spacer.
Our invention will be more fully described in
connection with the speci?c example illustrated
in the drawings which form part of the speci?ca
tion, and in which,
55
piece assembly removed;
neck portions 4-4 to end in two rectangular
suspension portions 5-5 which are provided with
armature and the pole piece is governed only by
50
Figure 2 is a side view of Figure 1 partly sec
tionized along the line 11-11 of Fig. 1;
Fig. 3 is a partly sectionized plan view of the 5
recorder shown in Figure l with the upper pole
not be in?uenced by shock and vibration, and it
is preferable that the pole faces and the sus
pension surfaces be ?nished in one operation so
thickness. In such a case the armature is mount
ed on the surface of the nonmagnetic member
4
netic recorder in accordance with the invention
partly, sectionized along line I?I of Fig. 2;
Figure 1 is a side elevation of an electromag
Arranged one on each side of the portions 4-4 45
and encircling the portion 2 with a clearance
suf?cient to prevent any contact therewith, are
two coils l2?l2. In the case of a recording de
vice as illustrated the coils |2?l2 carry the im
pressed ampli?ed current, whereas for repro- 50
ducing devices such coils carry the induced cur
rent. In either case the coils may be in series or
in parallel.
The coils l2--l2 are secured in a ?xed position,
for example by means of a wooden wedge I3, 55
2
2,1os,275
which forces the coils against the inner sides of
the poles l8?-l8, (see Fig. 2).
The pole piece assemblies A?A are arranged
with their respective faces 9?9 opposing each
other with the interposition of the armature l;
the latter being spaced from the faces 9?9 by
spacers ID.
The whole device is secured together
into a rigid unit by four bolts I I, passing through
the clearance holes 20 of the armature, and
10 through corresponding bores in the members
1---?! and in spacers ID.
In the device shown the distance between the
surfaces of the armature portion 2 and the pole
faces 8?8 is determined by the thickness of the
15 spacers I[l?l0, and due to this the device may be
quickly and accurately assembled or taken apart
and reassembled Without requiring special tools
or skill.
For mechanical recording the armature
I
20 should be comparatively rigid and for this pur
pose, as has been shown, is made integral with
its means of suspension and has the same thick
ness. However, in other electromagnetic devices,
for instance loudspeakers, the armature is pref
25 erably suspended in a less rigid manner. For this
purpose, the portions shown as 4?4 and 5--5
'
idly secured to said member and having pole
faces lying in the plane of said supporting sur
faces, an armature disposed adjacent to said pole
faces, and means including spacers for suspend
ing the armature from the supporting surfaces
of said member.
3. An electro-acoustic device for cutting a
sound track on a ?lm carrier comprising a coil,
means for producing a magnetic ?eld, a member
of non-magnetic material having supporting sur 10
faces lying in a common plane, a pole piece rig
idly secured to said member and having
faces lying in the plane of said supporting
faces, an armature disposed vadjacent to
pole faces, a cutting tool connected with
pole
sur
said
said
armature, and means for suspending said arma
ture from the supporting surfaces of said member.
4. An electromagnetic device comprising a coil,
means for producing a magnetic ?eld, two mem
bers of non-magnetic material having supporting
surfaces, the supporting surfaces of each member
lying in a common plane, a pole piece rigidly
secured to each of said members and having pole
faces lying in the plane of the supporting surfaces
of their respective member, an armature disposed 25
adjacent to said pole faces, and means for ?exibly
can be made of different material from that of
suspending said armature from the supporting
the central portions 2, whereby portions 4-?4 and
surfaces of said member, said means being
5?5 are rigidly secured to the central portion,
30 for instance by soldering or welding.
The magnetic ?eld in which the armature vi
brates may be supplied by a permanent magnet
l4, secured in good magnetic contact with the
pole pieces 6-6 by means of screws 15-15.
While the magnet I4 is shown as having the
shape of a bar, magnets of other shapes, for
example horseshoe magnets, may be also used.
Instead of using a permanent magnet, an electro
magnet may also be used, in which case a source
40 of supply for energizing the electromagnet is
required.
While we have described our invention in re
clamped between the supporting surfaces of said
members.
30
5. An electromagnetic device, comprising a coil,
means for producing a magnetic ?eld, a member
of non-magnetic material having supporting sur
faces lying in a common plane, a pole piece rig
idly secured to said member and having pole faces 35
lying in the plane of said supporting surfaces, a
flat piece of magnetic material of uniform thick
ness suspended from the supporting surfaces of
said member with the interposition of spacers,
said ?at piece serving as an armature and as a 40
?exible suspension therefor.
6. An electromagnetic device comprising a coil,
gard to speci?c examples and in speci?c appli
means for producing a magnetic ?eld, two U
cations, we do not wish to be limited thereto, but
desire the appended claims to be construed as
broadly as permissible in view of the prior art.
shaped members of non-magnetic material, each
member having two supporting surfaces lying in 45
What we claim is:
1. An electromagnetic device comprising, a coil,
means for producing a magnetic ?eld, a member
of non-magnetic material having supporting sur
faces lying in a common plane, a pole piece rig
idly secured to said member and having pole faces
lying in the plane of said supporting surfaces, an
armature adjacently disposed to said pole faces,
and means for suspending said armature from
the supporting surfaces of said member.
2. An electromagnetic device comprising, a coil,
means for producing a magnetic ?eld, a member
of non-magnetic material having supporting sur
60 faces lying in a common plane, a pole piece rig
a common plane, a pole piece rigidly secured to
each of said members and having two pole faces
lying in the plane of the supporting surface of
its respective non-magnetic member, a ?at piece
of magnetic material having a uniform thickness, 50
said piece having an armature portion, suspen
sion portions and intermediate torsional portions,
spacers between said suspension portions and the
supporting surfaces of said non-magnetic mem
bers to space the armature portion from said pole
faces, and means for clamping said non-magnetic
members, spacers and flat piece together.
ROELOF VERMEULEN.
AREND THOMAS VAN URK.
60
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