JPS6133476B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a time notification clock that gives an audio time notification during the day and stops the audio time notification at night.

FIG. 1 shows a circuit diagram of a conventional optical switch circuit of this type of time signal clock. In the figure, 1 is a power source, 2 is a clock drive section, and this clock drive section 2 drives a time display means. As shown in Figure 4a, every hour t
Switch 3 is turned on for t ₀ seconds before the start. 4 is a hexadecimal counter, and when the switch 3 is turned on, the hexadecimal counter 4 counts up and becomes the content of a predetermined time signal counter. This switch 3 is also connected in series to the input terminal I of the AND circuit 5.
When the switch 3 is turned on, the input terminal I becomes "H" level. Reference numeral 11 denotes a photodetection switch circuit, and the photodetection switch circuit 11 has a circuit configuration as shown in FIG. That is, a photoelectric conversion element 12 such as CdS, a photodiode, a phototransistor, etc.
is used in the bias circuit of the transistor _Q1 , and the base voltage of the transistor _Q1 is set by the bias resistor 14 and the photoelectric conversion element 12, and the internal resistance of the photoelectric conversion element 12 changes the amount of incident light as shown in FIG. The transistor Q ₁ is operated by utilizing the change in illuminance (LUX), and an output is obtained from the connection point between the emitter of the transistor Q ₁ and the emitter resistor 13.
That is, when the surrounding brightness is bright, the photoelectric conversion element 12
The internal resistance of becomes smaller and the base potential of transistor _Q1 becomes higher.Conversely, when it gets dark, the internal resistance becomes larger and the base potential of transistor _Q1 becomes lower.When the brightness is below a predetermined level, transistor _Q1 turns off, and the Therefore, when the brightness is above a predetermined brightness, an "H" level output is obtained, and when the brightness is below a predetermined brightness, an "L" level output is obtained. The output of this photodetection switch circuit 11 is output from an AND circuit 5.
input to the input end of. Therefore, if the surrounding brightness is darker than the set illuminance before and after the hour, the output of the light detection switch circuit 11 will be at the "L" level as shown in Figure 4b, and the output will be at the "L" level as shown in Figure 4c. The output of the AND circuit 5 becomes "L" level, the latch circuit 6 does not operate, the power switch circuit 7 does not supply power to the audio time signal generation circuit 8, and the audio time signal from the speaker 9 is cut off. . By the way, when the ambient brightness is brighter than the set illuminance, the amount of light incident on the photoelectric conversion element 12 increases, transistor _Q1 is turned on, and the output of the photodetection switch circuit 11 is as shown in FIG. 4d before and after the hour. As shown in FIG. 4e, the output of the AND circuit 5 becomes the "H" level t seconds before the hour, and the latch circuit 6 operates at the same time, and as a result, the power switch circuit 7 is the fourth
The power supply 1 is supplied to the audio time signal generation circuit 8 by operating as shown in FIG. For example, the audio time announcement may read, ``Ping Pong Pan will notify you of XX o'clock now.'' The final time announcement sound is exactly on the hour. When the voice notification ends,
The reset signal from the audio time signal generating circuit 8 is shown in Fig. 4h.
The latch circuit 6 is reset and its output is set to "L" level, and the audio time signal generation circuit 8
The power switch circuit 7 is operated to turn off the power source 1 of the computer.

By the way, t seconds before the hour, the time signal is input by turning on the switch 3, and the level at the input terminal of the AND circuit 5 becomes "H" level <Fig. 4 i>, and the ambient brightness at this time changes. Suppose that the light is darker than the set illuminance and the output of the light detection switch circuit 11 is at the "L" level, and after a certain time _tD , for example, if you turn on the light in the room or open the sliding door in the room. When light from the next room enters or when the surrounding illuminance suddenly becomes brighter, such as when the curtains are opened, and becomes higher than the set illuminance, the output of the light detection switch circuit 11 will be as shown in Fig. 4j. The output of the AND circuit 5 changes from the "L" level to the "H" level, and therefore the output of the AND circuit 5 becomes the "H" level before the hour t-t _D as shown in FIG. When the level becomes "H", the power switch circuit 7 operates as shown in FIG.
As shown in Figure 4 m, the "pawn" that indicates the hourly time signal during the audio time announcement will be delayed by t _D from the hour.
As a result, there was a drawback that the timing was significantly different from the standard time signal sound of radio, TV, etc.

The present invention has been made in view of the above-mentioned drawbacks.
The purpose of this is to provide a time signal clock that turns on and off the audio time notification depending on the surrounding brightness, so that even if there is a sudden change in the surrounding brightness, the final adjustment of the audio time notification To provide an audio time notification clock capable of giving accurate audio time notification without deviating from the notification timing of the hour.

The present invention will be explained below with reference to Examples. FIG. 5 shows a circuit configuration diagram of an embodiment of the present invention, in which 1
0 is a photodetection pulse drive circuit, and this photodetection pulse drive circuit 10 is connected in series with a switch 16, which is a switch element that functions as a clock drive unit 2 and turns on t seconds before the hour and maintains the on state for a predetermined period of time. is,
Capacitor 17, photoelectric conversion element 1 such as CdS
2, and a differential circuit consisting of a resistor 18,
The connection point between the photoelectric conversion element 12 and the resistor 18 is connected to a latch circuit 6 consisting of an RS flip-flop.
It is connected to the set terminal S of. The latch circuit 6, which is an RS flip-flop, is composed of two NOR circuits 6a and 6b, and is reset by inputting a reset signal from the audio time signal generating circuit 8 to a reset terminal R. 7 is a power switch circuit, and this power switch circuit 7 connects the audio time signal generating circuit 8 to the power supply 1 via a PNP type transistor Q ₂ , and connects the base of this transistor Q ₂ to the power supply 1.
An NPN type transistor _Q3 is connected, and the output of the latch circuit 6 is inputted to the base of the transistor _Q3 via a resistor 19.
The audio time signal generating circuit 8 records, for example, an audio notification signal "Ping Pong Pan will notify you of the hour starting from 00:00" every hour, for example, from 1 o'clock to 12 o'clock. For example, the hourly audio notification signal corresponding to the output of the hexadecimal counter 4, which counts up each time the hourly notification signal of the clock drive unit 2 is input, is outputted at the time of power input to drive the speaker 9. There is.

Now, as shown in FIG. 6a, when the switch 16 is turned on by the action of the clock drive section 2 t seconds before the hour and the power source 1 is supplied to the photodetection pulse drive circuit 10, Since the photodetection pulse drive circuit 10 constitutes a differential circuit, it produces a pulse-like output as shown in FIG. 6b. The voltage level of the output is V=R ₂ /R ₁ +R ₂ E (where E is the voltage of the power supply 1, R ₁ is the resistance value of the photoelectric conversion element 12, and R ₂ is the resistance value of the resistor 18), and this potential V becomes the set input of the latch circuit 6, and sets the latch circuit 6 when the voltage is higher than the threshold potential of the NOR circuit 6a. Here, when the brightness around the installation location of the photoelectric conversion element 12 is brighter than the set illuminance, the potential V is
Resistor 1 so that the voltage is higher than the threshold potential of a.
8. By setting the resistance value ratio of the photoelectric conversion element 12, when the surrounding brightness is brighter than the set illuminance, the latch circuit 6 is set and the output becomes "H" level as shown in FIG. 6c. Therefore, the transistor Q ₃ of the power switch circuit 7 is turned on, and the base current flows through the transistor Q ₃ so that the transistor Q ₂ is also turned on. By turning on the transistor _Q2, the power source 1 is supplied to the audio time signal generation circuit 8 through the transistor _Q2 , and the audio time signal generation circuit 8 operates to issue an audio time signal as shown in FIG. 6d. It will be done. During the audio time signal, a voice indicating the hour is announced at a preset timing, that is, at a timing that coincides with the hour. When the predetermined audio time signal notification is completed, the audio time signal generation circuit 8 outputs a reset signal as shown in FIG. Both transistors Q ₂ and Q ₃ are turned off. As a result, the power supply 1 of the audio time signal generation circuit 8 is cut off.

Next, when the surrounding brightness is darker than the set illuminance, the potential V at point a of the photodetection pulse drive circuit 10 drops because the resistance value _R1 of the photoelectric conversion element 12 increases, and becomes below the threshold potential of the NOR circuit 6a. , the latch circuit 6 is not set, the output is at the "L" level, the transistors Q ₁ and Q ₂ of the power switch circuit 7 are turned off, and the power 1 is not supplied to the audio time signal generating circuit 8. In this way, the photodetection pulse drive circuit 10 generates an output only for a short period of time when the switch 16 is turned on, that is, when the hourly alarm signal is input. This is determined by the brightness of the hour, and sudden changes will not cause a large deviation between the audio time announcement and the hour.

Needless to say, when the switch 16 is opened, the charge in the capacitor 17 is discharged by a discharging resistor (not shown) provided in parallel with the capacitor 17, so as to be ready for the next hour on the hour.

The present invention provides a time signal clock which, as described above, inputs a time signal from the clock driving section a predetermined time before the hour, and then notifies a warning bell for the predetermined time and then notifies the hour signal. , a switch element and a capacitor that turn on at the predetermined time before the hour as a time notification signal input and maintain the on state for a certain period of time due to the action of the clock drive unit, and a resistance value that changes depending on the amount of ambient external light. A photodetection pulse drive circuit that consists of a differentiator circuit consisting of a series circuit of a photoelectric conversion element and a resistor, and generates a pulse-like output from the connection point between the photoconversion element and the resistor using the charging current of the capacitor when the switch element is turned on. Then, if the output level of this photodetection pulse drive circuit is above a certain level, a latch circuit consisting of a flip-flop is set and the output is latched at the "H" level, and the "H" level output of this latch circuit turns on. a power switch circuit that connects a power source through the power switch circuit when the power switch circuit is turned on, and an audio signal that notifies a warning bell from the predetermined time before each hour until the hour; and an audio signal that notifies the warning bell. The switch element before the hour is equipped with an audio signal generation circuit that stores an audio signal that later notifies the hour, and outputs the audio signal to drive a speaker according to the hour. By turning on the light detection pulse drive circuit, a pulsed signal with a level corresponding to the amount of ambient light can be output to the latch circuit, and since the light detection pulse drive circuit is a differential circuit as described above, the switch element is turned on. The output of the photodetection pulse drive circuit is generated only immediately after the capacitor of the differentiation circuit is charged, and even if a sudden change in the amount of external light is detected by the photoelectric conversion element, the output of the photodetection pulse drive circuit is generated. The latch circuit operates from the time the switch element is turned on until the end of the time notification when the photoelectric conversion element detects the amount of external light immediately after the switch element is turned on. The timing of the time signal does not deviate from the timing of the hour, making it possible to perform accurate time signal notification. Since the circuit can be implemented using a latch circuit consisting of a flip-flop, the circuit configuration can be simplified, and the circuit space can be reduced to reduce costs.

[Brief explanation of the drawing]

Fig. 1 is a circuit block diagram of a conventional example, Fig. 2 is a specific circuit diagram of the above photodetection switch circuit, Fig. 3 is a photo-resistance characteristic diagram of a photoelectric conversion element used in the above photodetection switch circuit. 4A to 4N are time charts for explaining the same operation, FIG. 5 is a circuit configuration diagram of an embodiment of the present invention, FIGS. 6A to 6E are time charts for explaining the same operation, and 1 is Power supply, 2 is a clock drive unit, 6 is a latch circuit, 7 is a power switch circuit, 8 is an audio time signal generation circuit, 10 is a photodetection pulse drive circuit, 12 is a photoelectric conversion element, 16 is a switch, 17 is a capacitor, 18 is a It is resistance.

Claims (1)

[Claims] 1. In a time signal clock which notifies the hour signal after a predetermined time before the hour is inputted from the clock drive section and the time signal is issued for the predetermined time period, the time signal is inputted from the clock drive section. A switch element and a capacitor that turn on at the predetermined time before the hour as a time signal input and maintain the on state for a certain period of time, a photoelectric conversion element whose resistance value changes depending on the amount of ambient external light, and a resistor. A photodetection pulse drive circuit that generates a pulse-like output from the connection point between the photoconversion element and the resistor by the charging current of the capacitor when the switch element is turned on, and this photodetection pulse A latch circuit consisting of a flip-flop that is set and latches the output at the "H" level when the output level of the drive circuit is above a certain level, and a power switch circuit that is turned on by the "H" level output of this latch circuit. When the power switch circuit is turned on, a power source is connected through the power switch circuit, and an audio signal is generated in advance to notify a warning bell from the predetermined time before each hour until the hour, and a time signal is sent on the hour after the warning bell is notified. 1. A time notification clock comprising: an audio time generation circuit that stores an audio signal to notify and outputs the audio signal to drive a speaker according to the hour.