JPH01173461A - Indicating method for magnetic tape end - Google Patents

Abstract

PURPOSE:To facilitate to indicate the detection of the end of a magnetic tape by driving to light a forward direction display element and reverse direction indication element at a time for prescribed time according to the detection of one of the end or the head end of the magnetic tape. CONSTITUTION:When a reproducing key signal is inputted from a key input device 3, a display data-off means 1J is driven by a tape end detection signal from a tape end detection data discriminating means 1D, and lets the outputs of both OR gates OR2, OR3 go to a ground. Accordingly, the forward direction display element D1 which has been lighted till then is switched off, and just after that, both display elements D1, D2 are driven to light at a time, and it is displayed that the tape end is detected. Then, after definite time elapses, the display data-off means 1J is driven, and both display elements D1, D2 are switched off at a time, and afterward, a tape driving mechanism 2 shifts to rewinding action, and the reverse direction display element D2 is driven to light. Thus, the detection of the end of the magnetic tape can be clearly displayed.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention is applicable to R-DAT (rotary digital audio tape recorder) players, VTR (video tape recorder) players, in-vehicle DAT players, etc. This invention relates to a method of displaying the edge of a magnetic tape.

<Prior art> The original function of such an R-DAT player is to perform playback by running a magnetic tape in one direction.
Unlike existing compact cassette tape recorders, it does not have an auto-reverse function that continuously plays back both sides of the magnetic tape, but automatically winds the tape when it reaches the end of the magnetic tape during playback or fast-forwarding. Generally, there is a transition to a return operation. On the other hand, in the case of in-vehicle DAT players, for the purpose of simplifying operability, it is common to automatically switch to playback operation when the beginning of the magnetic tape is reached during rewind operation. It is.

The display relationship between the tape mechanism and the magnetic tape in a conventional magnetic playback device having such a function will be explained based on the drawings in FIG. 5 and the following drawings. It controls the display circuit of the tape, and when any of the operation keys Kl~ of the key input device 3 is operated, the key input signal is sent to the data discrimination means I of the microcomputer 1.
After inputting the input to C and determining which operation key is 1 to 4, the control data conversion means 1A causes the tape drive mechanism 2 to perform an operation corresponding to the operation key 1 to 4. It is converted into a signal for execution and output to the tape drive mechanism 2.

As a result, the tape drive mechanism 2 transmits a mode signal indicating the current operating mode by a mode switch or a mode pattern to the data discriminating means 1 of the microcomputer 1.
Output to C. This mode signal is generally 3
The digit rob and rlJ signals are used, and are determined to be, for example, ro 10J during a playback operation, "100" during a fast forward operation, and roolJ during a rewind operation.

Based on this mode signal, the microcomputer 1 determines whether or not the tape drive mechanism 2 is operating in an operation mode corresponding to the key operation of the key operator 3. Then, the display data conversion means 1B outputs a required display drive signal to drive the display circuit according to the result of the determination of the operation at that time. For example, during playback or fast-forwarding, the first
A display drive signal is output from the signal output terminal 01 of the transistor Q, and this display drive signal is supplied to the base of the first transistor Q.
1 is turned on, which causes the current limiting resistor R to be transferred from the DC power supply element B.
1 through a forward display element D1 consisting of a light emitting diode.
A current flows through the forward direction display element D1, which lights up to indicate that the magnetic tape is being driven in the running direction during playback or fast forwarding. On the other hand, during the rewinding operation, the display drive signal is output from the second signal output terminal 02, the second transistor Q2 is turned on, and a current flows from the DC power supply element B to the reverse direction display element D2 via the current limiting resistor R2. is played, and the reverse direction display element D2 lights up to indicate that the magnetic tape is being driven in the running direction during the rewinding operation. The display elements DI and D2 are arranged on the front panel of the main body of the tape player so that they can be easily viewed by the user, as shown in FIG. 9, and generally use light emitting diodes or lamps.

Next, the operation and display when the magnetic tape reaches the end or start end in each operation will be explained based on FIGS. 6 to 8. First, as shown in FIG. When the key signal is inputted [step S1], the tape drive mechanism 2 starts the playback operation, the mute of the signal system is turned off, and the display drive signal is output from the first signal output terminal 01 to display the forward direction. Element D1 is turned on (step S2). During this playback operation, when it is detected that the magnetic tape has reached the end and an end detection signal is input from the tape drive mechanism 2 to the data discrimination means 1C of the microcomputer 1 [step S3], the mute of the signal system is turned on. to aim the output of the audio signal [Step S
4) After that, the tape drive mechanism 2 shifts to the rewinding operation [step S5], and accordingly, the second signal output terminal 0
A display drive signal is outputted from D2, and the reverse direction display element D2 is turned on [Step S6].

Further, as shown in FIG. 7, when a fast forward key signal is input from the key input device 3 to the microcomputer 1,
The tape drive mechanism 2 enters a fast-forward operation, the signal system mute is turned on, and a display drive signal is output from the first signal output terminal 01, and the forward display element D1 is turned on.
Step S12].

When the magnetic tape reaches the end due to the fast-forwarding operation, steps S14 and S15, which are similar to steps S5 and S6 described above, are performed.

That is, the rewinding operation is automatically performed, and the reverse direction display element D2 is lit.

Furthermore, as shown in FIG. 8, when the rewind key signal is input from the key input device 3 to the microcomputer 1 [step S21], the tape drive mechanism 2 enters the rewind operation and the signal system is muted. It is turned on and the reverse direction display element D2 is lit [Stellaf S22]. When the start end of the magnetic tape is detected by this rewinding operation [step S23], the tape drive mechanism 2 shifts to the playback operation [
Step S24], the mute of the signal system is turned off [step S25], and the forward direction display element D1 is turned on. [Step S6].

<Problems to be Solved by the Invention> By the way, as shown in FIGS. 6 and 7, when the end of the magnetic tape is detected during a playback operation or a fast-forward operation, the rewind operation is automatically performed. As shown in FIG. 8, when the rewinding operation automatically shifts to the reproducing operation upon detection of the starting end of the magnetic tape, the user may mistake this for an erroneous operation. In particular, if the end or start end of the magnetic tape is detected immediately after a key operation and the tape drive is automatically switched, the user may assume that the operation was erroneous and must try again.

Therefore, if a dedicated display element is provided to display the end 01 or start end of the magnetic tape when it is detected, the above problem will be solved, but if the display element is provided separately,
There are problems in that driving circuits and wiring are required for this purpose, resulting in high costs, and a space is required to provide the display element. In particular, in the case of a vehicle-mounted player, various operating bodies and display sections are arranged in a limited space on the front surface, so it is very difficult to add one display element.

<Objective of the Invention> The present invention has been made in view of the above conventional problems, and provides a magnetic tape end that can display the state when the magnetic tape has reached the end and start end using existing display elements. The technical problem is to provide a method for displaying.

Means for Solving the Problems> In order to achieve the above-mentioned problems, the present invention provides a function to automatically shift to a rewind operation when a magnetic tape reaches the end during a playback operation or a fast forward operation, or a function to automatically switch to a rewind operation. A method for displaying the end or start of a magnetic tape in a magnetic playback device having a function of automatically transitioning to playback when the magnetic tape reaches the start during a return operation, the method comprising: By either detection, a forward direction display element displays the running direction of the magnetic tape during playback operation or fast forward operation, and a reverse direction display element displays the running direction of the magnetic tape during rewinding operation.
It is characterized by the use of means for simultaneously driving the lights on for a predetermined period of time.

<Operation> When the end of the magnetic tape is detected during a playback operation or a fast forward operation, the forward direction display element and the reverse direction display element are lit at the same time. This allows the user to visually recognize that the end of the magnetic tape has been detected, and when the rewinding operation is subsequently started, the user can determine that the rewinding operation is associated with the end of the magnetic tape. Similarly, when the start end of the magnetic tape is detected during rewinding, the simultaneous lighting of two display elements makes it possible to visually confirm that the end of the magnetic tape has been detected, which also prevents misunderstandings when automatically transitioning to playback. Never. Furthermore, since the end of the magnetic tape is displayed using the existing forward direction display element and reverse direction display element, the cost is almost the same as the existing display element, and no additional display space is required.

<Embodiments> Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the display method of the present invention, and in this figure, the same or equivalent parts as in FIG. 5 are given the same reference numerals, and the explanation thereof will be omitted. The tape end detection data discriminating means 1D, mode discriminating means IE, and key data discriminating means IF are similar to the data discriminating means IC shown in FIG. 5, and are shown divided. . Further, the forward display data converting means 1G and the backward display data converting means 1H are similar to the display data converting means 1B shown in FIG. 5, and are shown divided. be.

Further, P, F, and R are respectively a playback control data output terminal, a fast-forward control data output terminal, and a rewind control data output terminal, which selectively output the playback control signal or the fast-forward control signal in the forward direction. The first OR gate ORI for inputting to the display data conversion means IG is not shown in FIG. 5, and is not newly provided in implementing the present invention.

The components newly provided in carrying out the present invention are a tape end display data conversion means 11, two OR games) OR2, OR3, and a display data off means 1J. The tape end display data converting means 12 simultaneously outputs signals from two output terminals based on the tape end detection signal from the tape end detection data discriminating means 1D. OR2 and OR3 are forward direction display data conversion means 1G and reverse direction display data conversion means I, respectively.
A signal is input from H, and a signal is also input from the tape end display data conversion means II, and the signal is output to the first signal input terminal 01 and the second signal input terminal 02, respectively. The display data off means 1J turns on both OR gates OR2 and OR3 at a predetermined timing based on the tape end detection signal output from the tape end detection data discrimination means ID.
The output of the transistor is grounded, and is configured to turn on and off a switching transistor, for example.

Next, the operation shown in FIG. 1 will be explained based on the flowcharts shown in FIGS. 2 to 4. In addition, in Figures 2 to 4,
Steps that are the same as those in FIGS. 6 to 8 are given the same step numbers, and their explanations will be omitted. First, as shown in FIG. 2, when a playback key signal is input from the key input device 3 [step S1], the process proceeds from step S2 to step S4 in the same way as in the case of FIG. 6, and then the tape end is detected. The display data off means 1J is driven by the tape end detection signal from the data discrimination means 1D, and both OR gates O
By lowering the outputs of R2 and OR3 to the ground, the forward direction display element D1, which had been lit until then, is turned off [step S7], and immediately after that, the drive of the display data off means IJ is released, and the display data turn off means IJ is released. Data conversion means II
A signal is output from the re-output terminal of both display elements Di, D2.
are simultaneously driven to turn on [step S8], and the simultaneous lighting of both display elements DI and D2 indicates that the end of the magnetic tape has been reached. Then, after a certain period of time has elapsed, the display data off means IJ is driven to turn off both display elements DI and D2 at the same time [step 38], and then the tape drive mechanism 2 shifts to the rewinding operation [step S5] and vice versa. The direction display element D2 is driven to turn on (step S6).

Similarly, when the fast-forward key signal and the rewind key signal are input as shown in FIGS. 3 and 4, respectively, the end and start ends of the magnetic tape are detected, respectively. Then, the display elements DI and D2 that were lit at that time are turned off [step 816. After step S27], both display elements DI and D2 are turned on simultaneously [step S18. Step S28] After displaying for a certain period of time that it is the end of the magnetic tape, both display elements DI
.

D2 goes out [Step S18. step S29],
Shift to rewind operation and playback operation respectively [Step S14. Step S24] is carried out. Both display elements D mentioned above
It is practically preferable to set the simultaneous lighting time of I and D2 to about 200 to 500 m5ec.

It should be noted that the present invention is not limited to the above-mentioned description and illustrated examples, but may include various modifications without departing from the scope of the claims. For example, the display data off means 1J shown in FIG.
The two simultaneous lighting times may be set by a timer circuit. That is, step S7 and step S9 in FIG. 2, and step S16 and step S1 in FIG.
8. Step S27 and step S29 in FIG. 4 can be omitted. Further, the operation of step S5 in FIG. 2 may be performed between step S4 and step S9. Similarly, step S14 in FIG.
may be performed between step S13 and step S18, and step S24 in FIG. 4 may be performed between step S28 and step 329.

<Effects of the Invention> As detailed above, according to the magnetic tape edge display method of the present invention, a means is used to simultaneously light up the forward direction display element and the reverse direction display element by detecting the magnetic tape end. The detection of the magnetic tape end can be clearly displayed using existing display elements, and it is possible to reliably prevent the user from mistaking it for a malfunction or erroneous operation, without increasing costs, and without requiring additional display space. It can be achieved without doing anything.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a device for implementing the display method of the present invention, FIGS. 2 to 4 are flowcharts of FIG. 1, FIG. 5 is a block diagram of a conventional device, and FIGS. 6 to 8 This figure is a flowchart of FIG. 5, and FIG. 9 is a perspective view of the front part of a magnetic reproducing apparatus to which the present invention is applied. 1■...Data conversion means for tape end display D1...Forward direction display element D2...Reverse direction display element Patent applicant Sharp Co., Ltd. Agent Patent attorney Nishi 1) New Figure 1 Figure 5

Claims (1)

[Claims] (1) A function that automatically shifts to rewind operation when the magnetic tape reaches the end during playback or fast forward operation;
Alternatively, a method for displaying the end or start of the magnetic tape in a magnetic playback device having a function of automatically shifting to playback when the magnetic tape reaches the start end during rewinding operation, the method comprising: By detecting either of the starting edges, a forward direction display element that displays the running direction of the magnetic tape during playback operation or fast forward operation, and a reverse direction display element that displays the running direction of the magnetic tape during rewinding operation are set to a predetermined value. A method for displaying magnetic tape edges, characterized in that the lights are simultaneously driven for a certain amount of time.