US2721905A - Transducer - Google Patents

Description

D. J. MUNROE Oct. 25, 1955 TRANSDUCER Original Filed March 4, 1949 INVENTOR. David CZ Munroe BY WW MM 4 255.

United States Patent TRANSDUCER David J. Munroe, Racine, Wis, assignor to Webster Electric Company, Racine, Wis., a corporation of Delaware Original application March 4, 1949, Serial No. 79,663. Divided and this application January 19, 1951, Serial No. 206,868

Claims. (Cl. 179-100.2)

The present invention relates to a transducer especially adapted for use in a recorder-reproducer of the magnetic type and it has for its primary object the provision of a new and improved transducer. The present application is a division of my copending aplication Serial No. 79,663, filed March 4, 1949, and assigned to the assignee of the present application.

The primary object of the present invention is the pro vision of a new and improved transducer and especially a recording and reproducing head as it may be called, which can be easily constructed and is readily adjustable into proper position relative to a record medium movable past it. In brief, the transducer of the present invention comprises a magnetic core having an air gap extending transversely of the direction of tape movement past it, and a core supporting housing having a pivot defining support for supporting the housing and core for angular adjustment relative to the tape, whereby the housing and core can be adjusted so that the gap is at right angles with the direction of tape movement. More particularly, the pivot defining support comprises housing structure defining a narrow ridge located in the plane of the air gap.

Other objects and advantages of the present invention will become apparent from the ensuing description of an illustrative embodiment of the present invention in the course of which reference is had to the accompanying drawing in which:

Fig. 1 is a fragmentary top plan view of a recorderreproducer apparatus including a transducer (record-reproducer head) constructed in accordance with the present invention;

Fig. 2 is a rear elevational View of the record-reproducer head;

Fig. 3 is a side elevational view of the head, core and coil assembly, with the cover shown in section along the line 33 of Fig. 1;

Fig. 4 is a bottom plan view of the core and coil assembly, and

Fig. 5 is an exploded view illustrating the two part coil and core construction of the head.

The transducer of the present invention may be utilized for various purposes but it has been illustrated as used in a recorder-reproducer apparatus, further details of which are shown in the above referred to application.

Referring first to Fig. 1, the transducer is illustrated as a Whole by the reference character 10. It comprises a magnetic core 12 defining an air gap 14, see Fig. 2, past which is moved a magnetic record medium such as magnetic tape 16. The transducer, which is hereinafter referred to as a head is enclosed in a metallic container or can 20 having a generally outwardly extending rim 22 at its bottom and an opening 24 enabling the tape to run in close contact with the exposed face 26 of the core structure 12, which, incidentally, as may be noted from Fig. 5, includes the left and right hand core portions 12A and 12B. The core and coil asembly is substantially enclosed within the cam 20 by a combined closure and mounting 2,721,905 Patented Oct. 25, 1955 plate 28 secured to the underside of the cover as by the eyelets 30.

In accordance with the present invention the plate 28 is provided with a transverse downwardly extending ridge 32 of curved configuration about which the head can rock upon a mounting plate 34 so that it can be adjusted and secured with the air gap 14 at right angles to the direction of the tape, as by the securing screws 36 illustrated in Fig. 1. Preferably, the ridge is in line with the air gap as shown in Fig. 2.

In accordance with another feature of the, present invention, the core and coil assembly is constructed in two parts which are subsequently asembled. The core comprises the two parts 12A and 12B, which may be made of magnetic laminations. The core portions are mounted within left and right polystyrene coil forms 40 and 42. The head includes two windings, one of which is used for reproduction and the other for recording. The coils are sectionalized, i. e., one portion of each coil is wound on each coil form and the two portions are connected in series. The record coil, which is indicated by the reference character 44, is connected to the terminals 44T, which the reproduce coil 46 is connected to the terminals 46T, these two sets of terminals being secured to a terminal plate 48. The core and coil assembly is held in assembled relation by the terminal plate 48 and a tie plate 50, the parts being held in assembled relation by a suitable cement. A gum rubber pad 52 is placed between the tie plate and the underside of the cover top thereby to hold the core-coil assembly in the can in a cushioned manner.

From the foregoing it may be noted that the transducer or head may be constructed very simply and economically and that it can be readily adjusted so as to position it properly relative to the tape moving past it. To elfect the adjustment, the relative positions of the screws are changed, thereby to rock the head and move the air gap 14 so that it is transverse to the direction of tape movement.

While the present invention has been described in connection with the details of a specific embodiment of the invention, it should be understood that these details are not intended to be limitative except insofar as set forth in the accompanying claims.

What is claimed as new and desired to be secured by Letters Patent of the United States is:

1. A magnetic transducer adapted to be mounted on a supporting structure for use with a longitudinally movable tape comprising a magnetic core having an air gap extending transversely of the direction of tape movement and adapted longitudinally to magnetize the tape and means including a housing having structure defining a narrow ridge located in the plane of said gap and adapted to engage said supporting structure along at least one line lying substantially parallel to said plane for supporting the core for angular adjustment, whereby the core can be adjusted so that the gap is at right angles to the direction of tape movement.

2. A magnetic transducer adapted to be mounted on a supporting structure for use with a tape movable along a fixed path comprising a magnetic core having an air gap disposed within a plane, a housing for supporting the core with the gap adjacent the tape, depending means formed in the housing in the plane of the gap and in engagement with the structure, and adjustable means for positioning the housing on the structure with the depending means extending perpendicularly outward from the fixed path of the tape whereby the gap may be adjusted to a position at a right angle relative to the path of movement of the tape.

3. A magnetic transducer adapted to be mounted on a supporting surface for use with a longitudinally extending movable tape comprising a magnetic core having an air gap lying substantially in a single plane, a housing member defining a cavity open at one end and having an opening in one side thereof, said magnetic core being disposed within said housing with said air gap adjacent said opening so that the tape can be moved adjacent said air gap, and a plate secured to the housing to close the open end thereof, said plate having a depending angularly shaped portion with an apex lying within said plane and adapted to engage the supporting surface along a line Within said plane so that the transducer may be adjusted to position the gap at a right angle relative to the tape.

4. A mount for a head that includes magnetic circuit means providing a gap, for assembling such a head with an instrument provided with means for moving an elongate record body of magnetizable material in a predetermined path, to position such a head with its gap in proper registration with the record body path and to provide azimuth adjustment of such head to position its gap in perpendicular relation to the longitudinal axis of the record path across it; said mount comprising a plate, means for securing such a head in a preselected position overlying one surface of a portion of said plate and with the median plane of its gap disposed in substantially right angular relation to said plate surface, a substantially V-shaped portion of said plate projecting from the opposite side of said plate portion with its apex disposed to lie substantially in the median plane of the gap of a head so secured.

5. A mount for a head that includes magnetic circuit means providing a gap, for assembling such a head with an instrument provided with means for moving an elongate record body of magnetizable material in a predetermined path, to position such a head with its gap in proper registration with the record body path and to provide azimuth adjustment of such head to position its gap in perpendicular relation to the longitudinal axis of the path across it; said mount comprising a generally fiat plate, means for securing such a head to said plate in a preselected position With the median plane of its gap disposed in substantially right angular relation to one surface of the plate, a substantially V-shaped portion of said plate projecting from the plane of the plate on the side opposite said surface and with its apex disposed to lie substantially in the median plane of the gap of a head so secured, said plate being extended beyond the margins of the position of a head so secured in the directions of travel of a record body and being arranged for cooperation with means for securing the mount to such an instrument with said projecting plate portion in rocking contact with the structure of such instrument.

References Cited in the file of this patent UNITED STATES PATENTS 2,016,987 Cheadle Oct. 8, 1935 2,530,584 Pontius Nov. 24, 1950 2,560,569 Hare July 17, 1951 2,561,365 Hare July 24, 1951 FOREIGN PATENTS 676,810 Germany June 12, 1939

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