Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1991-01-10
1992-11-24
Tupper, Robert S.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360106, 360109, G11B 5588, G11B 552, G11B 2110
Patent
active
051668505
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to an improved mounting assembly for a magnetic transducing head, the mounting assembly permitting rapid and precisely repetitive lateral displacement of the head in a direction transverse to the recorded track provided on a magnetic tape, thus permitting the head to follow the recorded track more accurately.
BACKGROUND OF THE INVENTION
In the prior art the transducing head is mounted on a flexible longitudinal leaf member, the leaf member mounted as a cantilever beam, secured at one end to a mounting base to extend outwardly from the base and support a transducing head at the free end of the beam. In the helical-scan magnetic tape transport art, one or more of these leaf-type members may be used, each mounted at the interior of a rotating drum, to extend radially toward the periphery of the drum, the head protruding through an opening in the drum to traverse or scan the recorded tracks on a magnetic tape curved around the periphery of the drum in a helical path.
A mounting arrangement as described above typically incorporates a mechanism for driving the leaf member, such as a voice coil assembly interactive with the leaf member for positioning the head by means of a feedback circuit connected between a head positioning apparatus and the voice coil assembly. However, a significant disadvantage of such a head positioning arrangement is the limitation of head positioning parameters to relatively low speed displacements, since the relatively long and thin head positioning member will not uniformly bend at high speeds. That is, the inherent flexibility of the long, thin head positioning member sets up undesirable resonances in the member under rapid and repetitive flexure loadings. Such resonances also result in undesirable changes in the bending moment under repeated flexures of such member. The occurrence of such conditions in the member under the desired loading sequence severely impairs the ability of a head mounted on the member to follow a tape track recorded on a magnetic tape.
One prior art support structure for a transducing head is shown in U.S. Pat. No. 4,212,043 by Baker entitled "Magnetic Transducing", issued Jul. 8, 1980 and assigned to the assignee of the present invention.
However, that patent, although displaying a more stable structure presents a structure which is directed to controlling the movement of a head stack having multiple heads disposed adjacent a magnetic tape. The movement of a head stack has to be parallel to the plane of the tape to enable each head in the stack to follow a respective track on the tape. A single head mounted on a leaf member is positioned to engage a single tape track, and positioning of that single head by a cantilever bending element is viable because of the relatively small displacements involved. Further, the patented structure is also directed to solve certain problems introduced by centrifugal forces bearing against the support structure and not problems relating to rapid and repetitive displacement of the transducing heads. Moreover, the structure of the device described in the aforementioned patent is not amenable to the swift and repeated displacements required in a system directed to the rapid processing of data, i.e., a digital tape transport.
SUMMARY OF THE INVENTION
Accordingly, the mounting assembly of the present invention is directed to an apparatus and method for use in a magnetic recording system which requires rapid and repetitive positional changes of the transducing head with respect to the data tracks, such transducer mounting assembly requiring a bending member of light-weight construction, but having sufficient rigidity along the major portion of its length to minimize changes in the bending moment under rapid changes in head position The present invention produces a more stable structure and an improved RF output at the head Moreover the present invention includes an improved bending structure which aligns the head with the neutral plane of the bending element associated with the moun
REFERENCES:
patent: 4337492 (1982-06-01), Brookhart et al.
Aldrich William N.
Dolby Dale P.
Magnusson Steve L.
Price Larry A.
Almeida George B.
Ampex Corporation
Tupper Robert S.
LandOfFree
Rigid, wedge-shaped mounting structure for minimizing resonances does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Rigid, wedge-shaped mounting structure for minimizing resonances, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Rigid, wedge-shaped mounting structure for minimizing resonances will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-926756