Dynamic magnetic information storage or retrieval – Miscellaneous
Patent
1988-11-16
1991-05-21
Tupper, Robert S.
Dynamic magnetic information storage or retrieval
Miscellaneous
242191, G11B 1518
Patent
active
050180401
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to a tape time display device for displaying the remainder time of the tape that remains on a supply reel or the travel time of the tape that has been wound on a take-up reel (hereinafter referred to as "tape time") in a tape recorder or the like.
BACKGROUND ART
Examples of conventional tape time display devices are disclosed by Japanese Laid-open Patent Application No. 98763/1981 and Japanese Laid-open Patent Application No. 165970/1981.
In these conventional devices, it is assumed that tape remainder time T on a supply reel is given by: ##EQU1## where r is the diameter of the hub of the reel, d is the thickness of the tape, fs is the rotation period of the supply reel, and v is the tape speed. Display of the tape remainder time or the tape travel time is made only during the recording and reproduction processes when the tape speed v is constant.
There is a conventional device which calculates and displays the tape time during the fast feed and the rewind travel processes similar to the constant-speed travel, as disclosed in Japanese Laid-open Patent Application No. 165970/1981. However, this conventional device calculates and displays the tape time on the basis of the rotation speed or the rotation period of the reel and the tape remainder time immediately before switching to the fast feed or rewind, processed by detection of the rotational speed of the reel.
Because the conventional tape time display devices are configured as described above, if they are designed to perform display of the tape time for both the constant-speed travel process; and the fast speed and process, the construction of the device becomes complicated which produces an expensive device, because the equations used for the tape remainder time calculations are different.
The invention has been made to solve the above-described problems. An objective of the present invention is to provide an inexpensice tape time display device which can calculate and display the tape time on the basis of a simple equation in any travel condition once the constant-speed travel is made.
SUMMARY OF THE PRESENT INVENTION
The tape time display device according to an embodiment of the present invention comprises means for generating pulse signals of a fixed number each time a reel completes a rotation, means for detecting the rotation period of said reel from said pulse signals during the constant-speed travel, means for calculating the reel pulse number corresponding to the length of the tape wound on the reel on the basis of said rotation period, the radius of the hub of said reel, the travel speed of the tape and the thickness of the tape, means for increasing and counting up or decreasing the number of pulses output accompanying the subsequent rotation of the reel depending on the direction of the rotation of the reel, means for calculating the tape time, when the tape time indication command is input by converting the tape pulse number into the constant-speed travel time, and means for displaying the tape time that has been calculated.
The tape time display device according to an embodiment of the present invention calculates the period of the rotation of a reel from the intervals of the pulse signals during the constant-speed travel and the number of turns of the tape wound on the reel from the radius of the hub of the reel, the tape speed, and the thickness of the tape. The device calculates the reel pulse number P corresponding to the tape length on the basis of the number of turns of the tape. The reel pulse number increases or decreases the number of pulses that are output in accordance with the subsequent rotation of the reel, depending on the direction of rotation of the reel, and the representation of the length of the tape wound on the reel is maintained. When the tape time display signal is input, the existing reel pulse number is converted into the travel time for a constant-speed travel, which is subsequently displayed on the display device.
According to the present invention, the ro
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patent: 4644436 (1987-02-01), Unno
patent: 4727446 (1988-02-01), Kaaden
Mitsubishi Denki & Kabushiki Kaisha
Sniezek Andrew L.
Tupper Robert S.
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