JPH034982Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention relates to a tape recorder with a clock.

(b) Prior art Some conventional tape recorders have a function called silent auto-stop, which prevents battery consumption and motor overload after the tape has finished running at the end of the tape. This function automatically detects the end of the tape and opens the power only in the circuit.

The disadvantage of this function is that the playback button does not return automatically, so it is necessary to return the playback button manually afterwards, and if the playback button is left unused for a long time without returning, it may damage the pinch roller, etc. There is a concern that it may cause deformation.

For this reason, some devices are configured to sound an end alarm to notify the end of the tape when the auto-stop means is activated, but depending on the time and situation, it may be inconvenient to sound the alarm, and the power supply battery will also be exhausted. There were problems such as:

(c) Purpose of the invention The present invention utilizes the time display section of a clock with a liquid crystal display, which has recently become available in tape recorders, and makes it possible to determine the operating state of the above-mentioned silent auto-stop means. .

(d) Structure of the invention The invention provides a tape recorder circuit in which the power is automatically turned off when an auto-stop means operates at the end of the tape, and a time display section that operates depending on the power while the tape recorder circuit is in operation. and a clock drive circuit that causes the time display to become inoperable at the same time as the power to the tape recorder circuit is automatically turned off.

(e) Embodiments Examples of the present invention shown in the drawings will be described below.

In the figure, 1 is a tape recorder circuit, 2 is closed by a detection signal S from the tape recorder circuit 1 when the tape is running, and is opened when the tape stops running at the end of the tape when the detection signal S is cut off. 4 is a power switch. The tape recorder circuit 1 includes the switch 3 and the power switch 4.
are connected in series to the power supply 5. 6 is a clock drive circuit, for example, NEC's clock LSI
(μPD833), with terminal VDD and terminal
By connecting the clock power supply 7 between VSS, clock functions other than the display operate, and by connecting the display power supply 8 between the terminals VDD and VSH, the time is displayed. The time is shown in section 9.
It is configured to be displayed digitally on an LCD or the like. Note that this display power source 8 is the clock power source 7.
It is also possible to double the voltage and supply it using .

Power to the tape recorder circuit 1 is supplied through a power switch 4 that closes when a play button, record button, fast forward button, rewind button, etc. is operated. The switch 3 is kept in the closed state by outputting the detection signal S representing , and when the detection signal S is cut off at the end of the tape, the switch 3 opens and the power is automatically turned off. be.

Reference numeral 10 denotes an interlocking switch that opens when the power switch 4 is closed. When the interlocking switch 10 is closed, the display power supply 8 is connected to the terminal VDD of the clock drive circuit 6 and the terminal through a backflow prevention diode 11.
VSH, and when the interlocking switch 10 is opened, the display power supply 8 is cut off, and instead of the power supply 8, the power supply 5 is connected to the terminal of the clock drive circuit 6 through the backflow prevention diode 12, the switch 3, and the power switch 4.
It is configured to connect to VDD and terminal VSH.

Since the present invention is configured as described above, when the tape recorder circuit 1 is in an inactive state,
Power switch 4 is open and interlock switch 10 is closed. Therefore, the time display section 9 is operated by the output from the clock driving circuit 6, and a digital time is displayed.

Then, when the power switch 4 is closed to supply the power 5 to the tape recorder circuit 1, and the tape recorder circuit 1 is put into operation, for example in the playback mode, the clock drive circuit 6 is turned on by opening the interlocking switch 10. The operation of the time display section 9 depends on the power supply 5 for the tape recorder circuit.

Therefore, when the tape recorder circuit 1 is operating in this reproduction mode, the time display section 9 is operated through the clock drive circuit 6, and digital time is displayed.

After that, when the end of the tape is reached and the detection signal S from the tape recorder circuit 1 is cut off, the switch 3 of the auto-stop means 2 is opened, the power supply 5 to the tape recorder circuit 1 is cut off, and the tape recorder automatically stops. mode, and at the same time, by opening the switch 3, the terminal VDD of the clock drive circuit 6
The power between the terminal VSH and the terminal VSH is cut off, and the time display section 9 becomes inoperable.

Therefore, the digital display on the clock goes out at the same time as the tape recorder automatically stops, and when this display goes out, it is possible to notify the auto-stop state.

(f) Effects of the invention As described above, according to the invention, the automatic stop state of the tape recorder can be notified by efficiently utilizing the clock drive circuit and turning off the digital display of the clock. This is extremely useful in a silent auto-stop tape recorder with a clock attached.

[Brief explanation of drawings]

The figure is a schematic circuit diagram of a tape recorder with a clock according to the present invention. DESCRIPTION OF SYMBOLS 1...Tape recorder circuit, 2...Auto stop means, 3...Switch, 4...Power switch, 5...Power supply for tape recorder, 6...Clock drive circuit, 9...Time display section, 10...Interlocking Switch.

Claims (1)

[Scope of utility model registration request] The tape recorder circuit includes a tape recorder circuit whose power is automatically turned off when an auto-stop means operates at the end of the tape, and a clock drive circuit which operates a time display section depending on the power supply while the tape recorder circuit is in operation, A tape recorder with a clock characterized in that the time display section is rendered inoperable at the same time as the power to the tape recorder circuit is automatically turned off.