GB2074130A - Magnetic tape cassettes - Google Patents
Magnetic tape cassettes Download PDFInfo
- Publication number
- GB2074130A GB2074130A GB8108831A GB8108831A GB2074130A GB 2074130 A GB2074130 A GB 2074130A GB 8108831 A GB8108831 A GB 8108831A GB 8108831 A GB8108831 A GB 8108831A GB 2074130 A GB2074130 A GB 2074130A
- Authority
- GB
- United Kingdom
- Prior art keywords
- magnetic tape
- intermediate frame
- tape cassette
- weight
- calcium carbonate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 22
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 11
- 239000003365 glass fiber Substances 0.000 claims abstract description 11
- 229920006337 unsaturated polyester resin Polymers 0.000 claims abstract description 6
- 239000000463 material Substances 0.000 claims description 7
- 229920005989 resin Polymers 0.000 claims description 7
- 239000011347 resin Substances 0.000 claims description 7
- 239000000805 composite resin Substances 0.000 claims description 5
- 229920001169 thermoplastic Polymers 0.000 claims description 5
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical group C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims description 4
- 239000003054 catalyst Substances 0.000 claims description 3
- 229920006305 unsaturated polyester Polymers 0.000 claims description 3
- 239000004615 ingredient Substances 0.000 claims 1
- 239000002991 molded plastic Substances 0.000 claims 1
- 239000011342 resin composition Substances 0.000 claims 1
- 239000000203 mixture Substances 0.000 abstract description 9
- 238000000465 moulding Methods 0.000 abstract description 8
- 239000004033 plastic Substances 0.000 abstract description 7
- 229920003023 plastic Polymers 0.000 abstract description 7
- 229920005992 thermoplastic resin Polymers 0.000 abstract 1
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 9
- 239000002253 acid Substances 0.000 description 5
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 description 3
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 3
- VZCYOOQTPOCHFL-OWOJBTEDSA-N Fumaric acid Chemical compound OC(=O)\C=C\C(O)=O VZCYOOQTPOCHFL-OWOJBTEDSA-N 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- QQVIHTHCMHWDBS-UHFFFAOYSA-N isophthalic acid Chemical compound OC(=O)C1=CC=CC(C(O)=O)=C1 QQVIHTHCMHWDBS-UHFFFAOYSA-N 0.000 description 2
- 230000013011 mating Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000000178 monomer Substances 0.000 description 2
- XNGIFLGASWRNHJ-UHFFFAOYSA-N phthalic acid Chemical compound OC(=O)C1=CC=CC=C1C(O)=O XNGIFLGASWRNHJ-UHFFFAOYSA-N 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 2
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 2
- 229920002554 vinyl polymer Polymers 0.000 description 2
- JAHNSTQSQJOJLO-UHFFFAOYSA-N 2-(3-fluorophenyl)-1h-imidazole Chemical compound FC1=CC=CC(C=2NC=CN=2)=C1 JAHNSTQSQJOJLO-UHFFFAOYSA-N 0.000 description 1
- 239000004342 Benzoyl peroxide Substances 0.000 description 1
- OMPJBNCRMGITSC-UHFFFAOYSA-N Benzoylperoxide Chemical compound C=1C=CC=CC=1C(=O)OOC(=O)C1=CC=CC=C1 OMPJBNCRMGITSC-UHFFFAOYSA-N 0.000 description 1
- 101000606504 Drosophila melanogaster Tyrosine-protein kinase-like otk Proteins 0.000 description 1
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229960003328 benzoyl peroxide Drugs 0.000 description 1
- 235000019400 benzoyl peroxide Nutrition 0.000 description 1
- WERYXYBDKMZEQL-UHFFFAOYSA-N butane-1,4-diol Chemical compound OCCCCO WERYXYBDKMZEQL-UHFFFAOYSA-N 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000004512 die casting Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229940093476 ethylene glycol Drugs 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000001530 fumaric acid Substances 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 description 1
- 239000011976 maleic acid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005555 metalworking Methods 0.000 description 1
- LVHBHZANLOWSRM-UHFFFAOYSA-N methylenebutanedioic acid Natural products OC(=O)CC(=C)C(O)=O LVHBHZANLOWSRM-UHFFFAOYSA-N 0.000 description 1
- 238000010137 moulding (plastic) Methods 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 229960004063 propylene glycol Drugs 0.000 description 1
- 235000013772 propylene glycol Nutrition 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- GJBRNHKUVLOCEB-UHFFFAOYSA-N tert-butyl benzenecarboperoxoate Chemical compound CC(C)(C)OOC(=O)C1=CC=CC=C1 GJBRNHKUVLOCEB-UHFFFAOYSA-N 0.000 description 1
- ZIBGPFATKBEMQZ-UHFFFAOYSA-N triethylene glycol Chemical compound OCCOCCOCCO ZIBGPFATKBEMQZ-UHFFFAOYSA-N 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B23/00—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture
- G11B23/02—Containers; Storing means both adapted to cooperate with the recording or reproducing means
- G11B23/037—Single reels or spools
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B23/00—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture
- G11B23/02—Containers; Storing means both adapted to cooperate with the recording or reproducing means
- G11B23/04—Magazines; Cassettes for webs or filaments
- G11B23/08—Magazines; Cassettes for webs or filaments for housing webs or filaments having two distinct ends
- G11B23/087—Magazines; Cassettes for webs or filaments for housing webs or filaments having two distinct ends using two different reels or cores
- G11B23/08707—Details
- G11B23/08785—Envelopes
Landscapes
- Compositions Of Macromolecular Compounds (AREA)
- Magnetic Record Carriers (AREA)
Abstract
A tape cassette is a tape- receiving casing formed from three main components comprising parallel, spaced-apart top and bottom plates 1 and 2 and an intermediate frame member 3 sandwiched therebetween. The frame member 3 is a dimensionally stable (C.L.E. 1 to 3 x 10<-5>/ DEG C) moulding made from a plastics composition consisting of an unsaturated polyester resin and a thermoplastic resin, and containing 50 to 75% of calcium carbonate and glass fibre by weight based on the total weight of the composition. <IMAGE>
Description
SPECIFICATION
Improvements in magnetic tape cassettes
This invention relates to improvements in
magnetic type cassettes, and more specifically to
a magnetic tape cassette comprising an
intermediate frame and clear top and bottom
plates.
We have previously proposed a magnetic tape
cassette having a case composed of a metallic
frame and clear plastic plates fastened to
opposite, upper and lower surfaces of the frame.
(Japanese Utility Model Application
No. 126245/1977.) The frame, of die-cast
aluminum or the like, keeps the clear top and
bottom plates from being deformed thermally or
otherwise, for example, due to molding strains,
and is material in use in ensuring very smooth
winding and unwinding of the spooled magnetic
tape. Thanks to the frame, the usual causes for off
track recording or playback, irregular reeling of the
tape, variations in the reproduction output, and
other troubles are eliminated. However, the metal
working such as die casting takes much time and
labour and, moreover, calls for additional,
complicated processes inter alia for surface
finishing and attaining improved corrosion
resistance, etc.
Ordinary magnetic tape cassettes in wide use
do not use the sandwich structure disclosed
above, but instead employ a pair of plastics half
cases or shells fastened together. These
conventional cassettes suffer from problems of
molding strains and thermal deformation. These
and other shortcomings make the two-shell
cassettes unsuitable for applications where
accuracy is the prime consideration. In other
applications, too, they invite one trouble or
another.
The present invention seeks to provide a magnetic tape cassette which compares favorably in dimensional accuracy with a cassette of the sandwich structure using a metallic intermediate frame as disclosed above, while retaining the advantages of plastic molding.
According to the present invention, there is provided a magnetic tape cassette including an intermediate frame which has parallel upper and lower surfaces and defines a sufficient space therein to hold a length of magnetic tape, and two substantially flat top and bottom plates fastened to the upper and lower surfaces of the intermediate frame, the said intermediate frame being made of a composite resin material which comprises an unsaturated polyester resin and a thermoplastic polymer containing from 50 to 75% by weight of calcium carbonate and glass fibre on the basis of the total resin weight.
The frame of the preferred cassette according to the invention has a low thermal expansion coefficient and maintains good dimensional accuracy because of negligible expansion and shrinkage at the time of molding. In addition, it possesses sufficient rigidity and strength to maintain the top and bottom plates securely fastened, and corrects or overcomes the effects of
molding strains or thermal deformation during use of those plates and thereby confers high dimensional accuracy and stability on the cassette. The molded frame can possess good surface properties outward appearance which enhances the merchandise value of the product.
Surprisingly, we have found that if the calcium carbonate component of the resin composite composition is omitted, a frame so obtained therefrom showed very poor surface quality. There is no such drawback if the calcium carbonate is present.
As regards the proportions of the two different resins, the use of at least 24% by weight (on the basis of the combined resin weight) of the unsaturated polyester resin gives good results, but this percentage content should not be deemed critical. The mixing ratio of glass fiber to calcium carbonate need not be very exact, either; a generally desirable range is from 10:60 to 30:40.
Greater importance is attached, however, to their combined percentage, which should range from 50 to 75% by weight on the basis of the total resin weight.
The invention will now be described in more detail by way of example only, with reference to the sole accompanying drawing which is an exploded view of a magnetic tape cassette embodying the present invention.
The exploded magnetic tape cassette as shown comprises a top plate 1, an intermediate frame 2, and a bottom plate 3. The top and bottom plates 1, 3 are formed of a plastics material which preferably is a transparent type. They are both securely fastened to the intermediate frame 2 at several points, each by machine screws 8. The enclosure or case assembled in this way will contain in its interior tape hubs, a length of magnetic tape, guide rollers, guide pins, and other well-known components which are not shown for the sake of simplicity.
The top plate 1 is a substantially flat plate having a pair of spaced-apart holes 4, 5 located adjacent a front-to-back centreline thereof, to receive shafts for driving the tape hubs. These holes are tapered inwardly so that their inlet ends are larger in diameter than the outlet ends.
Countersunk holes are formed in the four corners and in a bulge 7 on the upper surface of the plate to receive machine screws 8 for fastening the plate and the two other members together. The bulge 7 is formed with capstan holes 9 and holes 10 for guide pins, which serve also as aligning and matching means at the time of assembling. Along its free, outer edge the bulge has projections normal to its plane and the plane of plate 1, the projections defining recesses or windows 1 1 to permit the magnetic tape to be brought into and out of contact with the drives of a cassette recorder, not shown. These openings 9, 10 and recesses 11 are all provided in standardized locations. At a rear middle point of the under surface of the top plate a lug 30 is provided for precise alignment of the plate 1 with the intermediate frame 2.
The intermediate frame 2 is formed of the above-mentioned composite resin material. To be more exact, it is made by filling and mixing an unsaturated polyester resin and a thermoplastic polymer with from 50 to 75% by weight on the basis of the total resin weight with fine calcium carbonate powder and glass fiber. The resulting composite mixture is then formed by any usual plastics molding technique to the shape shown in the drawing.
The preferred unsaturated polyester is a prepolymer consisting of a condensate of a glycol and an unsaturated dibasic acid, or a condensate of a glycol and a mixture of saturated and unsaturated dibasic acid. The glycol may include inter alia ethyleneglycol, propyleneglycol, 1,4 butandiol, diethyleneglycol, and triethyleneglycol.
The unsaturated dibasic acid may include inter alia maleic acid, fumaric acid and itaconic acid, and saturated dibasic acid may include inter alia phthalic acid, isophthalic acid and telephthalic acid. The thermoplastic polymer used can be based on a vinyl monomer such as styrene. A catalyst such as a peroxide, including benzoylperoxide and tert-butylperbenzoate for example is used to polymerize the vinyl monomer and with the prepolymer. The glass fiber used preferably has a diameter of about 10-20 o and a length of 1-6 mm.
By way of example, a practical mixture for this use may have the following composition:
Unsaturated polyester 24.0
Styrene monomer 2.4
Calcium carbonate 60.0
Glass fiber 10.0
Catalyst 0.2
Others including 3.4
mold releasing agent
Generally rectangular in overall external shape, the intermediate frame 2 provides a sufficient internal space to hold a roll of magnetic tape. It consists of a long side portion 12, two short side portions 13, 14, and a front side portion 15. The long and short side portions have both their upper and lower surfaces confined to two common, parallel planes. Both ends or wings of the front portion 1 5, too, have upper and lower surfaces lying in the same parallel planes. As can be seen from the drawing, thin webs 16 extend inwardly from the lower surfaces of both front corners, where the side portions 13, 14 meet the wings of the front portion 15.With these webs the frame 2 forms a large center opening of epitrochoid form, with two circles drawn about the driving shaft holes in the top and bottom plates 1, 3 and the overlapping portions rounded or otherwise smoothly connected. The webs 16 are reinforcements for the thin portions of the intermediate frame and generally match the frame with the bottom plate 3. The under surfaces of the webs 1 6 are flush with the under surfaces of the side portions. Adjacent each end of the long side portion 12 there is a recess 17 for record-defeat tabs. Through all corners where the side portions meet there are screw clearance holes 18 corresponding to the countersunk holes 6 of the top plate 1.
The middle of the front side portion 1 5. which corresponds to the bulge 7 of the top plate 1, has a region 19 of greater thickness than the rest of portion 15. The region 19 has parallel upper and lower surfaces which constitute bearing faces for contact by the inner surfaces of the bulges of the top and bottom plates 1, 3. The thick-walled region 19 is also formed with a clearance hole 18.
As has been indicated with the bottom plate 3, the manner in which the lower bearing surface face of the part 19 contacts the underlying surface will be clear to those skilled in the art.
Extending forwards from the front face of the region 19 are two bifurcated guide projections 20 ending in vertical forward edges. Rings 21 are formed integrally with the upper and lower ends of the projections. The two bifurcated guide projections 20 support the edges of the magnetic tape at four points by the rings 21 and, since the projections and rings are molded with high dimensional accuracy, they serve as precise, positive guides for the tape. The rings 21 have holes to receive a capstan of a tape cassette player, and are of outside diameters such that the rings fit exactly in the holes 9, 9' of the top and bottom plates. The front side portion 15 moreover includes two slots 22, one formed in each wing for the passage of magnetic tape. Blind holes 23 are formed in the webs 16 close to the slots 22 to support guide roller shafts.Although not shown, the top plate also has blind holes mating with the holes 23.
The long side portion 12 has a through hole 31 positioned to align with the lug 30 of the top plate for precise engagement between parts 1 and 2, and the lower half of the hole 31 allows an upwardly protruding lug 33 of the bottom plate to fit exactly therein again to secure exact registration, but between parts 2 and 3.
Like the top plate 1, the bottom plate 3 is a substantially flat member of a clear plastics material. At its four corners and in the center of the bulge 7' there are screw holes 24 which register with the countersunk holes 6 of the top plate and the clearance holes 18 of the intermediate frame. Where necessary, coaxial with the screw holes at the corners there may be upwardly projected rings 25, which will fit in annular recesses (not shown) formed around the corresponding holes of the intermediate frame 2 for the purposes of guiding and, to some degree, of alignment. Protuberances 27 are also formed on the bottom plate, at locations to fit in the recesses 17 to be provided with the record-defeat tabs. In addition, the bottom plate 3 has a land 26 corresponding in shape to the epitrochoidal opening of the intermediate frame 2.Through holes 28, 29, which respectively register with the holes 4, 5 of the top plate 1 , are encircled by annular collars on which tape hubs (not shown) will loosely fit. Associated with the holes 4, 5, too, are similar annular collars (not shown) on the underside of plate 1.
The front side portion 7' of the bottom plate is substantially the reverse in configuration to the front portion 7 of the top plate i.e. is effectively a mirror image thereof, and its exterior structure may be regarded as identical with that of the top plate 1. The interior structure of the front portion, of the top plate 1 may be deemed the same as that of the front portion 7' of the bottom plate.
The components are assembled together in the following way. Hubs on which the magnetic tape is wound are fitted around the holes 28, 29 of the bottom plate, and the intermediate frame is places on the bottom plate, when the two components are accurately aligned thanks to the rings 21 fitting in the holes 9' and the upright tab 33 engaging the matching hole 31. Next, the top plate 1 is put on the upper surface of the intermediate frame, when the two are precisely aligned by guide means constituted by the rings 21 and the holes 9, and the lug 30 and the matching hole 31. Machine screws 8 are then inserted into the mating holes and tightened to align and secure the three components together.
Any molding strain or other deformation the top and bottom plates may have will be corrected by the flat upper and under surfaces of the intermediate frame, and the two plates will be kept in a perfectly parallel relationship. Moreover, the intermediate frame permits the cassette to retain proper dimensional stability against thermal and mechanical strains, as well as externallyoriginating forces e.g. impacts.
In the magnetic tape cassette described, the intermediate frame has a low linear expansion coefficient in the range of about 1 to 3 x 10-5/OC (the value depending upon the proportions of the fillers used). In this respect the frame has been found substantially equivalent to a frame of diecast aluminium whose coefficient is about 2.4 x 1 O-5/ C. The frame surface is much smoother than a frame formed of a composition containing glass fiber as the only filler. Magnetic tape cassettes made for experiment with the present intermediate frame exhibited no deformation on repeated fluctuations in temperature in cycles from -200C to +900 C.
With no trace of molding strain, either, they showed good dimensional accuracy and stability.
They were well comparable in these respects to cassettes employing die-cast aluminum intermediate frames, and possessed an additional advantage of being lighter in weight.
A magnetic tape cassette according to the present invention exhibits no variation in sensitivity but possesses increased tape running stability. There is no off-track or out-of-phase recording or playback. Use of clear top and bottom plates makes possible direct observation of the tape being paid out and taken up and can also keep the overall weight to a minimum.
Our copending application No. 8108832 (agents ref. 4634), filed on the same day as this application, teaches the manufacture of a tape hub from the same plastics composition disclosed herein.
Claims (6)
1. A magnetic tape cassette including an intermediate frame which has parallel upper and lower surfaces and defines a sufficient space therein to hold a length of magnetic tape, and two substantially flat top and bottom plates fastened to the upper and lower surfaces of the intermediate frame, the said intermediate frame being made of a composite resin material which comprises an unsaturated polyester resin and a thermoplastic polymer containing from 50 to 75% by weight of calcium carbonate and glass fibre on the basis of the total resin weight.
2. A magnetic tape cassette according to claim 1, wherein the intermediate frame has a coefficient of linear expansion in the range from 1 x 10-5to3 x 10-5/OC.
3. A magnetic tape cassette according to claim 1 or 2, wherein the calcium carbonate and glass fiber are used in a ratio by weight ranging from 60:10 to 40:30.
4. A magnetic tape cassette according to claim 1 , 2 or 3, wherein the resin composition includes 24% unsaturated polyester, 2.4% styrene monomer, 60% calcium carbonate and 10% glass fiber, the balance being incidental ingredients including a catalyst.
5. A magnetic tape cassette according to claim 1 and substantially as herein described with reference to and as shown in the accompanying drawing.
6. A moulded plastics member for use in holding magnetic tape, which is a composite resin material consisting of an unsaturated polyester resin and a thermoplastic polymer and containing 50 to 75% by weight of calcium carbonate and glass fibre on the basis of the total resin weight.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1980038215U JPS56140977U (en) | 1980-03-25 | 1980-03-25 | |
| JP3871480U JPS56140556U (en) | 1980-03-26 | 1980-03-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB2074130A true GB2074130A (en) | 1981-10-28 |
Family
ID=26377409
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8108831A Withdrawn GB2074130A (en) | 1980-03-25 | 1981-03-20 | Magnetic tape cassettes |
| GB8108832A Withdrawn GB2074131A (en) | 1980-03-25 | 1981-03-20 | Hub for magnetic tape |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8108832A Withdrawn GB2074131A (en) | 1980-03-25 | 1981-03-20 | Hub for magnetic tape |
Country Status (1)
| Country | Link |
|---|---|
| GB (2) | GB2074130A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2517861A1 (en) * | 1981-12-04 | 1983-06-10 | Sony Corp | MAGNETIC TAPE CASSETTE, IN PARTICULAR FOR MAGNETOPHONE |
| EP0214604A2 (en) * | 1985-09-04 | 1987-03-18 | Hitachi Maxell Ltd. | Tape cartridge |
| GB2185234A (en) * | 1986-01-07 | 1987-07-15 | Donald Pfotenhauer | Tape cassette of laminated construction |
| EP0492012A1 (en) * | 1990-12-24 | 1992-07-01 | Metarex Research Institute Corp | Tape cassette |
| US5482222A (en) * | 1993-01-07 | 1996-01-09 | V-Lite Corporation | Lightweight solid-core video cassette cartridge |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6331079A (en) * | 1986-07-25 | 1988-02-09 | Polyplastics Co | Method for fixing tape to core part of plastic reel |
| DE8621947U1 (en) * | 1986-08-16 | 1986-10-16 | Basf Ag, 6700 Ludwigshafen | Cuboid cassette for tape-shaped recording media |
-
1981
- 1981-03-20 GB GB8108831A patent/GB2074130A/en not_active Withdrawn
- 1981-03-20 GB GB8108832A patent/GB2074131A/en not_active Withdrawn
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2517861A1 (en) * | 1981-12-04 | 1983-06-10 | Sony Corp | MAGNETIC TAPE CASSETTE, IN PARTICULAR FOR MAGNETOPHONE |
| EP0214604A2 (en) * | 1985-09-04 | 1987-03-18 | Hitachi Maxell Ltd. | Tape cartridge |
| US4791484A (en) * | 1985-09-04 | 1988-12-13 | Hitachi Maxell, Ltd. | Tape cartridge case composition for reducing modulation noise |
| EP0214604A3 (en) * | 1985-09-04 | 1989-06-07 | Hitachi Maxell Ltd. | Tape cartridge |
| GB2185234A (en) * | 1986-01-07 | 1987-07-15 | Donald Pfotenhauer | Tape cassette of laminated construction |
| GB2185234B (en) * | 1986-01-07 | 1989-11-01 | Donald Pfotenhauer | Laminated tape cartridge |
| EP0492012A1 (en) * | 1990-12-24 | 1992-07-01 | Metarex Research Institute Corp | Tape cassette |
| US5482222A (en) * | 1993-01-07 | 1996-01-09 | V-Lite Corporation | Lightweight solid-core video cassette cartridge |
| US5564641A (en) * | 1993-01-07 | 1996-10-15 | V-Lite Corporation | Lightweight solid-core video cassette cartridge |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2074131A (en) | 1981-10-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |