# US 7,072,143 B2 · Tape reel

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- Number: US 7,072,143 B2
- Document ID: US7072143B2
- Status: Granted
- Kind: B2
- Application number: 10/285,523
- Filed: 2002-11-01
- Published: 2003-06-26
- Granted: 2006-07-04
- Earliest claimed: 2001-11-01
- Assignees: Fuji Photo Film Co., Ltd.
- Inventors: Masanosuke Kunikata; Masaki Suzuki; Hiroaki Takano
- Web page: https://patentgrep.com/patent/US7072143B2

## CPC

- G11B 23/037: Single reels or spools
- G11B 5/70: on a base layer
- G11B 15/66: Threading; Loading; Automatic self-loading
- G11B 5/78: Tape carriers
- G11B: INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER (recording measured values in a way that does not require playback through a transducer G01D9/00; recording or playback apparatus using mechanically marked tape, e.g. punched paper tape, or using unit records, e.g. punched or magnetically marked cards G06K; transferring data from one type of record carrier to another G06K1/18; circuits for coupling output of reproducer to radio receiver H04B1/20; gramophone pick-ups or like acoustic electromechanical transducers or circuits therefor H04R)

## Abstract

A normal tape reel is disclosed, comprising a tape reel portion and a magnetic tape wound on the reel core of the tape reel portion, wherein the ratio of the winding radius R of the magnetic tape to the radius r of the reel core (R/r) is not smaller than 3.5 and the winding hardness of the magnetic tape is adjusted to a range of from 1.9 to 11.5 N.

## Claims

### Claim 1

A tape reel comprising a tape reel portion and a magnetic tape wound on the reel core of the tape reel portion, wherein the ratio of the maximum winding radius R of the magnetic tape to the radius r of the reel core (R/r) is not smaller than 3.5 and the winding hardness of the magnetic tape is adjusted to a range of from 1.9 to 11.5 N.

### Claim 2 (depends on 1)

The tape reel as in claim 1, wherein the mechanical strength of the magnetic tape is from 0.8 to 3.4 Nμm.

### Claim 3 (depends on 1)

The tape reel as in claim 1, wherein the coefficient of friction between the magnetic layer surface and the back surface of the magnetic tape is from 0.30 to 0.85.

### Claim 4 (depends on 1)

The tape reel as in claim 1, wherein the coefficient of friction between the magnetic layer surface and the back surface of the magnetic tape is from 0.3 to 0.5.