JPH0411236Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a tape recorder that outputs an alarm signal when the remaining recording time of the tape, which changes from moment to moment during recording, becomes shorter than a predetermined alarm remaining time. To easily and inexpensively display a highly accurate alarm based on accurate remaining recording time determined from time.

Conventionally, in tape recorders such as video tape recorders and cassette tape recorders, if the recordable time of the tape, that is, the remaining recording time is insufficient for the recording time, it may be necessary to replace the tape during recording.

For example, when recording music with a cassette tape recorder, if the remaining recording time of the tape is shorter than the recording time of one song, for example, about 3 minutes, recording errors may occur.

By the way, Japanese Unexamined Patent Publication No. 54-53515 (G11B27/18) (hereinafter referred to as the first publication) discloses that the rotation detection pulse of the tape reel and the tape length are used to display the current position of the tape during recording and playback. A tape recorder is described that calculates the amount of tape travel by substituting the reel rotation speed and tape thickness based on the identification signal into a predetermined calculation formula, and calculates the tape travel time as the current position, which changes from moment to moment, from this amount of travel. ing.

In the case of the tape recorder of this first publication, the actual tape running time is determined and the current position is accurately displayed, but from this display it is not easy to know when to replace the tape, and moreover, the numerical display This requires a complicated and expensive dedicated display using a device.

Furthermore, in Japanese Utility Model Application Publication No. 53-57819 (hereinafter referred to as the 2nd publication), the elapsed time based on the clock count during recording is taken as the tape running time, and the remaining recording amount of the tape is calculated by calculating the time reduction according to the elapsed time. A tape recorder is described that calculates the time and automatically controls fast forwarding of the tape based on an output signal from a comparator when the remaining amount of time reaches a predetermined time.

In the case of the tape recorder of this second publication, the tape running time is determined by clock counting, so the accuracy of the tape running time is lower than that of the first publication, and it is difficult to accurately determine the remaining recording time. Moreover, it is not possible to notify the user of the timing for replacing the tape, etc.

This invention was made with the above points in mind, and is used in tape recorders that calculate tape running time based on tape reel rotation detection pulses and tape length identification signals. a display unit that lights up and displays settings; a comparison unit that outputs an alarm signal when the remaining tape recording time determined from the tape running time during recording becomes shorter than a predetermined alarm remaining time; and a comparison unit that outputs an alarm signal. An alarm control switch element that switches between presence and absence, and switching of the alarm control switch element when the alarm signal is output cancels the supply cutoff of the alarm display pulse based on the rotation detection pulse and synchronizes with the alarm display pulse. and switch,
The tape recorder includes a display control switch element that controls the display section to blink by intermittent power supply to the display section.

Therefore, according to the tape recorder of this invention, the accurate remaining tape recording time, which is based on the actual tape running time calculated in the same manner as in the case of the tape recorder of the first publication, is less than the predetermined alarm remaining amount time. When the voltage becomes shorter, the alarm control switch element switches based on the alarm signal from the comparison section, and the display control switch element cuts off the power supply to the display section.
Switch the display from a lighting display for recording settings to a flashing display for alarms such as tape replacement timing.

Therefore, with a simple and inexpensive configuration in which the display unit is used both to display recording settings and to display alarms, it is possible to accurately notify tape replacement timing, etc. Based on this notification, recording errors can be reliably prevented. can do.

Next, we will introduce the tape recorder of this invention, part 1.
Embodiments will be described in detail with reference to drawings showing examples.

In the drawing, 1 is a rotation detection unit that detects the rotation speed of the feed-out reel shaft and outputs a rotation detection pulse proportional to the rotation speed, and 2 is a rotation detection unit that identifies the selection of tape type, such as 30-minute or 60-minute tape. A type identification section 3 outputs an identification signal corresponding to the length of the tape, and 3 is an arithmetic section consisting of an integrated circuit for detecting the remaining amount of tape, and the rotation detection pulse and the identification signal are input to input terminals a and b, respectively. 4a is a recording switch provided between the power supply terminal 5 and the input terminal c of the calculation section 3; 4b and 4c are playback switches connected in series;
This is a pause switch, and a series circuit of both switches 4b and 4c is provided between the power supply terminal 5 and the input terminal d of the calculation section 3. Reference numeral 6 denotes a comparison unit that compares the remaining recording time outputted from the output terminal e of the calculation unit 3 with a predetermined alarm remaining time, and when the remaining recording time becomes shorter than the alarm remaining time. outputs a low-level alarm signal. Reference numeral 7 designates an NPN type alarm control transistor forming an alarm control switch element, the base of which is connected to the comparator 6 via the input resistor 8, and the emitter of which is grounded. Reference numeral 9 denotes an NPN type display control transistor forming a display control switch element, the base of which is connected to the collector of the alarm control transistor 7 via an input resistor 10. Reference numeral 11 denotes a buffer amplifier that amplifies the rotation detection pulse of the rotation detection section 1, and outputs the amplified rotation detection pulse to the base of the display control transistor 9 via the input resistor 10. Reference numeral 12 denotes a light emitting diode forming a display section, the anode of which is connected to the input terminal c of the calculation section 3 via the input resistor 13, and also connected to the collector of the display control transistor 9;
The cathode and the emitter of the display control transistor 9 are grounded.

During recording, the switches 4a to 4c are closed to set the recording state. At this time, when the switch 4a is closed, the program in the calculation section 3 starts to be executed, and the initial remaining time is the total recording time on one side of the tape. It is set as the amount time, and switches 4b and 4c
When the circuit is closed, the amount of tape travel is calculated from the same calculation formula as in the first publication, using the rotational speed of the reel shaft on the delivery side based on the rotation detection pulse and the thickness of the tape on the delivery side based on the identification signal, and is calculated from time to time. The changing actual tape running time is calculated repeatedly, this running time is counted down from the initial remaining amount time, the remaining recording time is calculated by the calculating section 3, and the remaining recording amount time is calculated from the output terminal e of the calculating section 3 to the comparing section 6. Then, the calculated remaining recording time is sequentially output.

On the other hand, when the switch 4a is closed, the light emitting diode 12 lights up, indicating that the recording state is set.

Furthermore, the comparator 6 compares the input remaining recording time with a predetermined warning remaining time preset in the comparator 6, for example, about 3 minutes in the case of a cassette tape recorder. If the remaining recording time becomes shorter than the alarm remaining time,
A low-level alarm signal is output from the comparator 6 to the base of the alarm control transistor 7 via the input resistor 8 .

By the way, while the remaining recording amount time is longer than the remaining alarm amount time, the output signal of the comparison section 6 is held at a high level, the base of the alarm control transistor 7 is held at a high level, and the transistor 7 continues to be turned on. .

While the alarm control transistor 7 is on, the base of the display control transistor 9 is grounded via the input resistor 10, the collector and emitter of the display control transistor 7, and the base of the display control transistor 9 is in a low state. level, the input of the rotation detection pulse via the buffer amplifier 11 to the base of the display control transistor 9 is cut off, and while the alarm transistor 7 is on, the display control transistor 9 continues to be off, and the light emitting diode 12 remains lit.

Next, when the remaining recording time becomes shorter than the remaining alarm time and a low-level alarm signal is output from the comparator 6 as described above, the base of the alarm control transistor 7 changes from high level to low level. The transistor 7 switches from on to off.

Then, when the alarm control transistor 7 is switched from on to off, the base of the display control transistor 9 changes alternately between low level and high level in accordance with the rotation detection pulse passed through the buffer amplifier 11. The supply cutoff of the rotation detection pulse, that is, the alarm display pulse, to the base of the display control transistor 9 is released.

Therefore, the display control transistor 9 is switched in synchronization with the alarm display pulse, and when the display control transistor 9 is turned on, the anode and cathode of the light emitting diode 12 are connected via the collector and emitter of the display control transistor 9. When short-circuited, the light emitting diode 12 is turned off, and conversely, when the display control transistor 9 is turned off, the light emitting diode 12 is turned on.

Therefore, according to the embodiment, the light emitting diode 12 that is set to the recording state and lights up is used;
When the remaining recording time of the tape becomes shorter than the remaining alarm time, the light emitting diode 12 blinks.
It is possible to effectively notify at accurate timing that the remaining tape recording time is shorter than the alarm remaining time and that the tape needs to be replaced. Mistakes can be reliably prevented.

[Brief explanation of drawings]

The drawing is a block diagram of the essential parts of one embodiment of the tape recorder of this invention. 1... Rotation detection section, 2... Type identification section, 3...
Arithmetic unit, 6...Comparison unit, 7...Alarm control transistor, 9...Display control transistor, 11...
...Buffer amplifier, 12...Light emitting diode.

Claims (1)

[Scope of Claim for Utility Model Registration] In a tape recorder that calculates a tape running time based on a tape reel rotation detection pulse and a tape length identification signal, a display section that is powered by recording settings and lights up to indicate the recording settings; a comparison unit that outputs an alarm signal when the remaining tape recording time determined from the tape running time during recording becomes shorter than a predetermined alarm remaining time; and an alarm control unit that switches depending on the presence or absence of the alarm signal. a switch element, and the supply cut-off of the alarm display pulse based on the rotation detection pulse is canceled by switching the alarm control switch element when the alarm signal is output, and switching is performed in synchronization with the alarm display pulse;
A tape recorder comprising a display control switch element that controls the display section to blink by intermittent power supply to the display section.