JPS6130236Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a digital clock with a radio.

In recent years, digital clocks have been developed that use commercial alternating current as a power source, divide and count the alternating current frequency to obtain a time signal, and display the time digitally. Such digital watches have been developed with integrated control circuits including a frequency dividing circuit, a counting circuit, an alarm function, an alarm stop function, a sleep function, a time adjustment function, and the like. LSIs for this type of clock include MM5385, MM5387, and MA1010 manufactured by National Semiconductor, Inc.
(all product numbers) are listed. Here, the alarm function is a function that makes the radio or buzzer integrated with the clock sound for a certain period of time at a preset time by operating a switch from the outside.The alarm stop function is a function that arbitrarily stops the alarm notification. The sleep function is a function that plays the radio for a certain period of time, for example, 30 minutes after a predetermined time (sleep switch operation time), and automatically turns off the radio after this period has elapsed.

FIG. 2 shows a block diagram of a conventional digital clock with radio, in which 21 is a plug connected to an AC power source, 22 is a power transformer 23, and a rectifier circuit 24.
A power supply circuit 25 is for a clock to which the reference frequency signal and power are input from the power supply circuit 22.
With LSI, time signal generation circuit, time correction control circuit, alarm function circuit, alarm function stop circuit, etc.
Sleep function circuits etc. are integrated circuits. This LSI 25 has output terminals such as a sleep signal output terminal 26, an alarm stop signal input terminal 27, an automatic radio position display signal input terminal 28, an alarm signal output terminal 29, and a sleep signal that is started by a sleep signal and remains closed for a preset period. It has a timer switch 30. In addition, it has a fast-forward signal input terminal (not shown) for time adjustment. Reference numeral 31 denotes a time display unit which receives a time signal from the LSI 25 and digitally displays the time, and uses Digitron (trade name), LED, liquid crystal, etc. as a display element. 32 is a radio receiver that includes a tuner section 33, an audio section 34, and a speaker 3.
5, the audio section 34 is connected to the power supply circuit 2 via a switching transistor 36 for radio power supply.
It is connected to the.

28, the audio section 24 is a power supply circuit 22.
This is a buzzer switching transistor inserted between the radio buzzer switch 39 and the radio buzzer switch 39, which will be described later, to apply a signal to the base and turn it on and off. The switch 39 has two interlocking slide contact pieces A ₃ , A ₄ and six contacts A ₃ -
Composed of C ₃ , a ₄ to C ₄ . Contacts a ₃ and a ₄ are radio side terminals, and contacts C ₃ and C ₄ are buzzer side terminals. Contact a ₃ is grounded, and contact b ₄ is connected to the base of transistor 28 via a resistor. Contact c ₄ is connected to alarm signal output terminal 29 . contact
_A4 is empty potential, contact _C3 is sleep signal output terminal 26
The contact b ₃ is connected to the tuner section 33 via a switching diode 30 for muting. Further, 40 is a function switch with two interlocking sliding contact pieces A ₅ , A ₆ and eight contacts A ₅ - D ₆ , A ₅ - D ₆
Consists of. Contacts a ₅ and b ₆ are connected to the alarm stop signal input terminal 27, contact b ₅ is connected to the sleeve signal output terminal 26, and C ₅ is grounded. contact d ₅
is connected to the automatic position display signal input terminal 28. Contact a ₆ is empty potential, contact c ₆ is transistor 36
The contact d 6 is connected to the sleep signal output terminal 26 via the base and the diode 37 , and the contact d ₆ is connected to the alarm signal output terminal 29 via the diode 38 . With this configuration, by operating the switches 39 and 40, an alarm signal and a sleep signal are applied to the radio, and when both signals are generated, the radio is turned on or off, or a buzzer is sounded instead of the radio. , etc. can be selected. However, this requires a radio buzzer changeover switch 39 with 2 circuits and 2 contacts, and a function switch 40 with 2 circuits and 3 contacts.
This method has drawbacks such as giving the impression that the operation is complicated to the user, and having a large number of parts, which causes high costs.

The present invention solves these problems, enables the above-mentioned function switching with a single slide switch, and reduces the number of circuits and contacts. An embodiment of the present invention will be described in detail below with reference to the drawings. Fig. 1 shows a block diagram of a digital clock with a radio that uses the above-mentioned clock LSI and integrates a radio, in which 1 is a plug connected to an AC power supply, 2 is a power transformer 3, and a rectifier circuit 4.
5 is a clock LSI into which the reference frequency signal and power are input from the power supply circuit (2).
A time signal generation circuit, a time adjustment control circuit, an alarm function circuit, an alarm function stop circuit, a sleep function circuit, etc. are integrated into an integrated circuit. This LSI
5 as an output terminal, a sleep signal output terminal 6,
It has an alarm stop signal input terminal 7, an automatic radio position display signal input terminal 8, an alarm signal output terminal 9, and a sleep timer switch 10 which is started by a sleep signal and remains closed for a preset period. In addition, it has a fast-forward signal input terminal (not shown) for time adjustment. 11 is
The time display unit receives the time signal from the LSI 5 and displays the time digitally, and uses Digitron (trade name), LED, liquid crystal, etc. as the display element. A radio receiver 12 includes a tuner section 13, an audio section 14, and a speaker 15. The audio section 14 is connected to the power supply circuit 2 via a radio power switching transistor 16. The base of this transistor 16 is connected to the sleep signal output terminal 6, and this transistor becomes conductive when the sleep signal is generated. Further, the base is connected to the alarm signal output terminal 9 via a backflow prevention diode 17. 18 is
This is a buzzer switching transistor inserted between the audio 14 and the power supply circuit 2, and is turned on and off by applying a signal to its base by a function switch to be described later. 19 is a functional switch with 2 circuits and 4 contacts, each with 5 contacts (a ₁ , b ₁ , c _{1 , d 1 ,} e ₁ ) (a ₂ , b ₂ , c ₂ , d ₂ ) arranged in two rows. , e ₂ ) and a sliding contact piece A ₁ that slides on these contacts,
Consists of A ₂ . Here, contacts a ₁ and b ₁ are both connected to alarm stop signal input terminal 7, contact c ₁ is connected to ground potential (Vss), and contacts d ₁ and e ₁ are both connected to automatic position display signal input terminal 8. ing. The other contact a ₂ is at empty potential, the contact b ₂ is at ground potential, the contact c ₂ is connected to the alarm signal output terminal 9, and the contact d ₂ is connected to the alarm signal output terminal 9.
is at an empty potential, and the contact _e2 is connected to the tuner section 13 via the base of the buzzer switching transistor 18 and the muting switching diode 20 in series. Here, at the radio off position, contact pieces A ₁ and A ₂ are
When contacts a ₁ , c ₁ , a ₂ , and c ₂ are in contact with each other, the radio-on position is such that contacts A ₁ and A ₂ are
When the contacts b ₁ , c ₁ , b ₂ , c ₂ are in contact with each other, the radio automatic control position is such that the contacts A ₁ , A ₂ are in contact with the contacts c ₁ , d ₁ , c ₂ , d ₂ respectively. The buzzer set position is when the contact pieces A ₁ and A ₂ are in contact with the contacts c ₁ , e ₁ , c ₂ , and e ₂ respectively.

Next, the operation of the above configuration will be explained.

When the radio is set to off: When the sleep signal (=Vss) is output, the transistor 16 becomes conductive, power is supplied to the audio section 14, and the radio sounds. At this time, since the signal (Vss) is input to the alarm stop signal input terminal 7 by the contact A ₁ through the contacts a ₁ and c ₁ , the alarm function is stopped without the alarm signal output being issued from the terminal 9. There is. Therefore, in this setting position, the radio operates only when sleep is on.

When set to radio on: Transistor 1 through contact A ₂ contacts B ₂ and C ₂
Since a negative bias is always applied to the base of 6, regardless of whether there is a sleep signal or an alarm signal,
The radio works.

When set to the radio automatic control position: The transistor 16 becomes conductive due to the sleep signal output, and the radio begins to sound and continues to sound for the period set by the sleep timer. Also, the transistor 16 becomes conductive when an alarm signal is generated.
When the alarm set time arrives, the radio starts to sound. Note that the sleep signal and alarm position are not output at the same time. It is usually designed to give priority to alarm signals. Further, at this position, a signal is applied from the contact piece A ₁ to the automatic position display signal input terminal 8 through the contacts c ₁ and d ₁ , and a display is performed on the display means (not shown).

In case of buzzer set: When the alarm setting time is reached, an alarm signal is generated and transistor 16 becomes conductive. This puts the radio into the operating state, but a muting signal is sent to the tuner section 13 through contact piece A ₂ and contacts C ₂ and e ₂ , and at the same time, a muting signal is sent to the audio section 1.
Since the buzzer signal is added to 4, the radio does not sound, but the buzzer sounds during the alarm period. At this time, a signal is input to the terminal 8 through the contact piece A ₁ and the contacts c ₁ and a ₁ , and a display indicating the operating state is made.

On the other hand, the instantaneous closing of sleep timer switch 10 generates a sleep signal, which conducts transistor 16 and causes the radio's audio section 14 to conduct.
works. However, the sleep signal is transmitted through contact A ₂ because of the presence of the backflow prevention diode 17.
And it is not applied to the transistor 18 and the diode 20 through the contacts C ₂ and a ₂ . Therefore, the buzzer does not sound and no muting signal is applied to the tuner unit 13, so only the radio sounds during the sleep operation period.

As explained above, in the digital clock with radio of the present invention, conventionally, a 2-circuit 3-contact switch for switching functions and a 2-circuit 2-contact switch for switching radio/buzzer were provided separately and operated independently. It combines all the things into one switch, and it also has 2
Since the number of circuits and contacts is reduced compared to the circuit including four contacts and both switches, the operation is simple and the number of parts is reduced, which has great practical effects.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional radio digital clock. 2 ... power supply circuit, 5 ... clock LSI, 11
……Time display section, 13……Tuner section, 14……
Audio section, 19...function switch.

Claims (1)

[Scope of utility model registration request] A power supply circuit, a time signal generation function that divides and counts the reference frequency signal to obtain time signals such as hours, minutes, seconds, etc., an alarm function that outputs an alarm signal at a preset time, and a specified time after the set operation time. a clock LSI incorporating a sleep function that outputs a sleep signal for a period of a radio receiver comprising a tuner section and an audio section driven by the power supply circuit; a radio power switching element provided between the audio section and the power supply circuit and controlled to open and close by the sleep signal or alarm signal;
a buzzer switching element provided between the audio section and the power supply circuit via a function switch and controlled to open and close by the sleep signal or alarm signal; and four buzzer switching elements: radio off, radio on, radio automatic control, and buzzer set. When the switch is in the radio off position, the alarm stop signal is input to the alarm stop signal input terminal, and when the radio on position is set, the switch is connected to the radio power supply regardless of whether the sleep signal or alarm signal is generated. The switching element is in a conductive state, and when in the radio automatic control position, the radio power switching element is brought into conduction by a sleep signal or an alarm signal, and when in the buzzer set position, the radio power switching element is brought into conduction by a sleep signal, or A digital clock with a radio, comprising a functional switch that brings the radio power switching element and the buzzer switching element into a conductive state and mutes a tuner section in response to an alarm signal.