US 4,399,355 AGranted

Display apparatus for tape running positions

AssigneeOlympus Optical Co., Ltd.

InventorsKen Satoh, Kenzi Furuta

Life of this patent

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Abstract

A display apparatus for tape running positions is provided with a first pulse generator (36) for generating m first pulses for each revolution of a supply reel (12) in a tape transport, a second pulse generator (38) for generating n second pulses for each revolution of a take-up reel (14), and a counter (44 to 48) for counting the number of the first pulses during one period of the second pulse. The ratio of count value change in the counter for a time period from the start to the end of the tape running is expanded to the square of the change ratio of rotational speed of the reel from the beginning to the end of the tape winding. A counting range of the counter at this time is proportional to m/n.

Claims11

Dependent claims

A display apparatus for tape running positions comprising:

a tape transport system in which the rotational speeds of first and second reels vary according to an amount of running of a tape;
first generator means connected to said first reel for generating m number of pulses constituting a first signal for each revolution of said first reel;
second signal generator means connected to said second reel for generating n number of pulses constituting a second signal for each revolution of said second reel;
counter means connected to said first and second signal generator means for counting the repetitive pulse number of said first signal appearing during one cycle period of said second signal, the count operation of said counter means being carried out so that
Cmax-Cmin=m/n (N-1/N)
where
Cmax denotes a maximum count of the repetitive pulse number of said first signal appearing during one cycle period of said second signal, Cmin a minimum count thereof, and N a rotational speed change of said first and second reels;
display means connected to said counter means for displaying an amount of running of the tape according to count data obtained from the count operation of said counter means;
a shift register connected to said first and second signal generator means and adapted to be clocked by said first signal and reset by said second signal;
and
a display array including display elements connected to output terminals of said shift register in which the energizing state of said display elements varies according to an amount of running of the tape.

8 more elements

Dependencies are inferred from the claim text.

Facts

Application: 06/220,236Filed 23 Dec 1980 · continuation
Priority: JP 52-11755730 Sep 1977
Granted: 16 Aug 1983
Term ends: Not estimatedThe source records don’t support an estimate.

Classification3 codes

G11B 27/34
Indexing; Addressing; Timing or synchronising; Measuring tape travel: indicating arrangements
G11B 27/13
By using information not detectable on the record carrier: the information being derived from movement of the record carrier, e.g. using tachometer
G11B
Information storage based on relative movement between record carrier and transducer

Family

Serial944,062Parent of this continuation · filed 20 Sep 1978
US 4,399,355 AThis patent

From the US filing history. Foreign family members aren’t listed.

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