JPS57210485A - Cassette discriminating method - Google Patents
Cassette discriminating methodInfo
- Publication number
- JPS57210485A JPS57210485A JP9573981A JP9573981A JPS57210485A JP S57210485 A JPS57210485 A JP S57210485A JP 9573981 A JP9573981 A JP 9573981A JP 9573981 A JP9573981 A JP 9573981A JP S57210485 A JPS57210485 A JP S57210485A
- Authority
- JP
- Japan
- Prior art keywords
- cassette
- basis
- diameters
- take
- tape
- 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.)
- Pending
Links
Landscapes
- Indexing, Searching, Synchronizing, And The Amount Of Synchronization Travel Of Record Carriers (AREA)
Abstract
PURPOSE: To accurately detect the remaining amount of a cassette tape on the basis of the discriminated diameter of a cassette hub, by performing arithmetic on the basis of rotation pulses generated by detecting rotational frequencies of a take up and a supply reel.
CONSTITUTION: The winding diameter of a cassette tape is constant without reference to the length of the tape, so hub diameters are made different. For this purpose, a take up reel La and a supply reel Lb are provided with rotation sensors which consists of light emitting diodes Da and Db and phototransistors Qa and Qb in combination, and the diameters D1 of the cassette hubs are calculated on the basis of rotation pulses from the below equation. Namely, D1 2= D0 2. F0 2 {(1/Fta)2+(1/Ftb)2-(1/F0)2}, where Fta and Ftb are the revolutional frequencies of the take up and reels at time (t), D0 is the external diameter of the cassette tape in the begining of running, and F0 is the revolutional frequency in the beginning of running. Consequently, the diameters of the cassette hubs are discriminated to accurately detect the remaining amount of the cassette tape.
COPYRIGHT: (C)1982,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9573981A JPS57210485A (en) | 1981-06-20 | 1981-06-20 | Cassette discriminating method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9573981A JPS57210485A (en) | 1981-06-20 | 1981-06-20 | Cassette discriminating method |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS57210485A true JPS57210485A (en) | 1982-12-24 |
Family
ID=14145850
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP9573981A Pending JPS57210485A (en) | 1981-06-20 | 1981-06-20 | Cassette discriminating method |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS57210485A (en) |
-
1981
- 1981-06-20 JP JP9573981A patent/JPS57210485A/en active Pending
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