US4241368A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic sheet recorder with a magnetic sheet surface treating means
Assignee: Fujifilm Holdings Corp
•
Filing: 1979-03-27
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Granted: 1980-12-23
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Expires: 1999-03-27
Abstract
Abstract In a magnetic sheet recorder, a scraping member is mounted in association with a magnetic head to be put into contact with the magnetic layer of a magnetic sheet together with the magnetic head. The scraping member is mounted ahead of the head so as to treat the recording track of the magnetic sheet in advance of the head when the magnetic sheet is rotated. The scraping member removes from the surface of the magnetic layer scratches and dust particles which cause drop-out of the output level.
Inventors
- 👤 Eiichi Tadokoro
- 👤 Tatsuji Kitamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:55
CPC Classifications
G; G11; G11B; G11B23/00; G11B23/50; G11B23/505
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
174 words
A magnetic sheet recorder provided with means for rotating a magnetic sheet having a magnetic layer, a back plate supporting the magnetic sheet, head support means, and a magnetic head supported on said head support means and which is put into contact with the magnetic layer of the magnetic sheet and moved substantially in the radial direction for recording or reproduction, wherein the improvement comprises a surface treating means provided in said recorder to be put into contact with the magnetic layer of the magnetic sheet simultaneously with said magnetic head for removing from the surface of the magnetic layer dust particles, scratches and the like thereon and said surface treating means being movable substantially in the radial direction of the magnetic sheet as the magnetic sheet is rotated, said surface treating means being mounted on said head support means on the leading side of said magnetic head and positioned to contact the area of the recording track of said magnetic sheet simultaneously with and in advance of such contact by said magnetic head.
Claim 2
Dependent Claim
174 words
A magnetic sheet recorder provided with means for rotating a magnetic sheet having a magnetic layer, a back plate supporting the magnetic sheet, head support means, and a magnetic head supported on said head support means and which is put into contact with the magnetic layer of the magnetic sheet and moved substantially in the radial direction for recording or reproduction, wherein the improvement comprises a surface treating means provided in said recorder to be put into contact with the magnetic layer of the magnetic sheet simultaneously with said magnetic head for removing from the surface of the magnetic layer dust particles, scratches and the like thereon and said surface treating means being movable substantially in the radial direction of the magnetic sheet as the magnetic sheet is rotated, said surface treating means being mounted on said head support means on the leading side of said magnetic head and positioned to contact the area of the recording track of said magnetic sheet simultaneously with and in advance of such contact by said magnetic head.
Claim 3
Dependent Claim
46 words
A magnetic sheet recorder as defined in claim 1 wherein said surface treating means is a scraping blade made of a material harder than that of the magnetic layer, the width of the scraping blade being at least equal to the width of the recording track.
Claim 4
Dependent Claim
58 words
A magnetic sheet recorder as defined in claim 2 wherein said scraping blade is resiliently mounted on the front part of the magnetic head by means of a vibration absorber interposed between the scraping blade and the magnetic head whereby the vibration generated by the scraping action of the blade is prevented from being transmitted to the head.
Claim 5
Dependent Claim
17 words
A magnetic sheet recorder as defined in claim 3 wherein said vibration absorber comprises a rubber sheet.
Claim 6
Dependent Claim
17 words
A magnetic sheet recorder as defined in claim 3 wherein said vibration absorber comprises a metal spring.
Claim 7
Dependent Claim
29 words
A magnetic sheet recorder as defined in claim 1 wherein said surface treating means is a rotating brush made of nylon fabric which is rotated at a high speed.
Claim 8
Dependent Claim
23 words
A magnetic sheet recorder as defined in claim 6 wherein said rotating brush is rotated at a speed of 600 to 8,000 rpm.
Claim 9
Dependent Claim
37 words
A magnetic sheet recorder as defined in claim 6 wherein a suction means is further provided adjacent to the rotating brush to suck up and remove dust particles produced by the surface treating action of the brush.
Claim 10
Dependent Claim
167 words
A magnetic sheet recorder provided with means for rotating a magnetic sheet having a magnetic layer, a back plate supporting the magnetic sheet, and a magnetic head which is put into contact with the magnetic layer of the magnetic sheet and moved substantially in the radial direction for recording or reproduction, wherein the improvement comprises a surface treating means provided in said recorder to be put into contact with the magnetic layer of the magnetic sheet simultaneously with said magnetic head for removing from the surface of the magnetic layer dust particles, scratches and the like thereon, said surface treating means being movable substantially in the radial direction of the magnetic sheet as the magnetic sheet is rotated; a pair of elongated openings respectively extending in radial directions of the magnetic sheet provided in said back plate, and said magnetic head and the surface treating means are put into simultaneous contact with the magnetic layer of the magnetic sheet through the respective openings and moved radially therealong.
Claim 11
Dependent Claim
167 words
A magnetic sheet recorder provided with means for rotating a magnetic sheet having a magnetic layer, a back plate supporting the magnetic sheet, and a magnetic head which is put into contact with the magnetic layer of the magnetic sheet and moved substantially in the radial direction for recording or reproduction, wherein the improvement comprises a surface treating means provided in said recorder to be put into contact with the magnetic layer of the magnetic sheet simultaneously with said magnetic head for removing from the surface of the magnetic layer dust particles, scratches and the like thereon, said surface treating means being movable substantially in the radial direction of the magnetic sheet as the magnetic sheet is rotated; a pair of elongated openings respectively extending in radial directions of the magnetic sheet provided in said back plate, and said magnetic head and the surface treating means are put into simultaneous contact with the magnetic layer of the magnetic sheet through the respective openings and moved radially therealong.
Claim 12
Dependent Claim
28 words
A magnetic sheet recorder as defined in claim 9 wherein the pressure with which said surface treating means is put into contact with the magnetic layer is adjustable.
Claim 13
Dependent Claim
50 words
A magnetic sheet recorder as defined in claim 9 wherein said surface treating means is a scraping member made of a material harder than that of the magnetic layer of the magnetic sheet, the width of the scraping member being at least equal to the width of the recording track.
Claim 14
Dependent Claim
28 words
A magnetic sheet recorder as defined in claim 11 wherein said scraping member is disc shaped and has a peripheral edge put into contact with the magnetic layer.
Claim 15
Dependent Claim
17 words
A magnetic sheet recorder as defined in claim 11 wherein said scraping member is of block shape.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-12-23 | 1984-06-23 | 1984-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-23 | 1988-06-23 | 1988-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-23 | 1992-06-23 | 1992-12-23 | $7700.00 | Window Closed / Lapsed |