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US 4,232,371 AGranted
Apparatus for indicating the amount of tape wound upon a reel
AssigneeSony Corporation
InventorHidetoshi Kamoto
Life of this patent
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AssigneeSony Corporation
InventorHidetoshi Kamoto
Estimating the term…
Apparatus is provided for indicating the amount of tape wound upon a reel, such as a supply reel or a take-up reel, in a two-reel cartridge when the cartridge is loaded into a processing device of the type which includes a loading device for withdrawing from the cartridge a portion of the tape wound upon the reel. A signal is generated representing the angular velocity of the reel when that reel rotates in response to the withdrawal of tape from the cartridge. This generated signal is combined with predetermined signals representing predetermined characteristics of the tape, the combined signals then being used to indicate the amount of tape which is wound upon the reel. In a preferred embodiment, the predetermined signals are: v, the velocity of the tape as it is unwound from the reel; .delta., the thickness of the tape; R.sub.H, the diameter of the innermost winding of the tape upon the reel; and the signal which represents the angular velocity of the tape is P.sub.S. A micro-processor having an arithmetic section combines, or operates upon these signals in accordance with the expression ##EQU1## wherein T.sub.S is the amount of tape wound upon the reel in terms of time. A particular application of this apparatus is in a video tape recorder having a guide drum about which the withdrawn portion of tape is deployed during the loading thereof, the amount of tape remaining in the cartridge for recording or playback being indicated by this apparatus.
Apparatus for indicating the amount of tape wound upon one reel, such as a supply reel or a take-up reel, in a two-reel cartridge, which apparatus is operative without regard to previous use of said cartridge when said cartridge is loaded into a processing device of the type which includes loading means for withdrawing a portion of the tape wound upon said one reel from said cartridge, said apparatus comprising:
Apparatus for indicating in terms of time T.sub.S the amount of tape wound upon a reel, such as a supply reel or a take-up reel, when said tape is transported from said reel at a velocity v, with the radius of the innermost turn of said tape on said reel being R.sub.H and the thickness of the tape being .delta., said apparatus being operative without regard to previous use of the tape and comprising:
Dependencies are inferred from the claim text.