JPS604251Y2 - Record hand usage time display device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a device for displaying the usage time of a record stylus in a record player, and is particularly devised to prevent the usage time counting circuit from being reset inadvertently.

The following will be described in detail with reference to embodiments shown in the drawings.

In this embodiment, when counting the usage time of the record stylus, there are three conditions: ■ The turntable drive motor is rotating; ■ The tone arm is removed from the armrest; ■ The tone arm is in the lowered position. When two conditions are met, it is determined that the record stylus is actually being used and counting is started.

That is, the terminal T1 has a switch output related to the plunger circuit that makes up the tone arm lifter, the terminal T2 has a switch output related to the motor circuit for driving the turntable, and the terminal T3 has a switch output related to the plunger circuit that makes up the tone arm lifter. The switch outputs of the switches for detecting this are respectively inputted, and when all of the above three conditions are met, the output of the AND gate G1 becomes H99.

1 is a reference oscillator configured with a CR multi-by-break, and when the output of the gate 1'Gt is "H", the oscillation output of the reference oscillator 1 is input to the frequency dividing circuit 2 via the AND gate G2, Therefore, pulses are output from this frequency dividing circuit 2 at a rate of one per hour.

This pulse is counted by a three-digit counter 3.

The frequency dividing circuit 2 and the counter 3 are backed up by a battery 4 when power is not applied to the record player.

The output of the counter 3 (three-digit binary output) is displayed on a three-digit display 5.

In this embodiment, the display device 5 is configured not only to display the usage time of the record needle, but also to display other information (for example, the number of revolutions of the record, etc.), so that the output of the counter 3 is input to the display 5 via a selection circuit 6 for display switching.

When comparing the use time display of the record stylus and the record rotation speed display, it is preferable to always display the record rotation speed, so in this embodiment, the selection circuit 6 always displays the record rotation speed. The rotation speed display side is configured to switch to the usage time display side when the switch output of the manually operated usage time display switch S□ is applied to the selection circuit 6 via the OR gate G3. .

Before turning on the power to the record player and starting playing the record, it is desirable to first know the usage time of the record stylus.

Therefore, in this embodiment, the power-on to the record player is detected by the differentiating circuit 7, this is amplified by the amplifier 8, and the output of this amplifier 8 is applied to the selection circuit 6 via the OR gate G3. As a result, the record needle is automatically set to display the usage time for a certain period of time (for example, about 2 seconds) after the power is turned on, which is defined by the capacitor C1 and the resistor R1.

That is, the differentiating circuit 7 and the amplifier 8 constitute an automatic display instructing circuit which automatically instructs the display of the operating time for a certain period of time after the power is turned on.

Now, when changing the record needle, it is necessary to reset the frequency dividing circuit 2 and the counter 3, but in order to prevent the reset operation from being performed by mistake due to carelessness, in this invention, the reset operation is Only when the switch S2 and the usage time display switch S1 are operated at the same time, the output of the AND gate G becomes "H99", thereby allowing the reset.

Further, with this configuration, it is possible to confirm whether or not the reset has actually been performed by checking whether or not the display 5 is displaying "o, o, o".

This is the gist of this invention. Furthermore, as shown in Figure 2, if the operating section of the reset switch S2 is located below the top surface of the record player cabinet so that it cannot be operated unless a rod-shaped object is used, erroneous operation can be more reliably prevented. .

Now, the explanation so far has been about the case where the display device 5 is used to display two or more pieces of information (displaying the usage time of the record needle and displaying the number of rotations of the record, etc.). The present invention is also applicable to the case where the hands are used only to indicate the usage time.

That is, in such a case, in order to reduce power consumption, the record needle usage time may be displayed only when the usage time display switch S1 is manually operated and for a certain period of time after the power is turned on to the record player. This is the translation.

According to the present invention described above, since the operation of the reset switch is effective only when the operating time display switch is operated, the operating time counting circuit is not reset inadvertently. , it is possible to check whether or not it has actually been reset, that is, whether the display has become zero.

Furthermore, if the operating section of the reset switch is located below the cabinet, erroneous operation can be more reliably prevented.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a record stylus operating time display device according to the present invention, and FIG. 2 is a diagram showing a time display switch and a cellar lower switch. 1, 2.3 are a reference oscillator, a frequency dividing circuit, and a counter for counting the usage time counting circuit, 5 is a display, SL is a usage time display switch, and S2 is a reset switch.

Claims (2)

[Scope of utility model registration request] (1) A usage time counter circuit that counts the usage time of the record stylus, a display that displays the usage time of the record stylus based on the output signal of this usage time counting circuit, and a display that displays the usage time on this display. A usage time display switch that indicates the
A usage time display device for a record hand comprising a reset switch that becomes effective only when the usage time display switch is operated and resets the usage time counting circuit. (2) The usage time display device for a record stylus according to claim 1, wherein the reset switch operation part is located below the top surface of the cabinet.