JPS5856440B2 - analog clock lighting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in lighting devices for portable watches, particularly analog watches.

An object of the present invention is to provide an analog clock with a lighting device that is highly reliable, especially at low temperatures.

In conventional analog watches, one way to read the time in dark places, such as at night, is to apply self-luminous luminous paint using radioactive isotopes such as promedium and tritium to the hands, dial, etc., and utilize the luminescence. It was customary.

However, the luminescent paints pose a risk of radiation damage to the human body and have restrictions in terms of manufacturing, after-sales service, and handling, and a lighting device that can replace luminescent paints has been desired.

In recent years, the number of quartz watches has been rapidly increasing, and if you take advantage of the characteristics of battery-powered watches, it is extremely easy to install an internal lighting device.In fact, with digital watches,
Most are equipped with an internal lighting system using a lamp as the light source.

Even in analog display watches, the most efficient lighting effect can be obtained when a lamp is used as the light source.

However, since the current consumption flowing through the lamp is approximately several mA, problems arise such as the motor stopping due to a drop in battery voltage when the lamp is lit.

Here, the characteristics of the watch battery will be explained in detail, and the present invention will be explained in detail.

Currently, wristwatch batteries are broadly classified into the following two types depending on the electrolyte.

One type uses potassium hydroxide (KOH1 hereinafter referred to as KOH) as an electrolyte, and is generally used in wristwatches that require a large current.

That is, they have been used in lamp lighting that flows a current of about 10 mA, digital watches equipped with speakers, and the like.

Disadvantages of this battery include the problem of internal leakage and the high self-discharge rate of the battery itself, so it tends not to be used in watches that aim for a long life.

The other one is sodium hydroxide (NaOH, hereinafter NaOH
) is used as the electrolyte, and is generally a battery for weak current.

This battery has a low self-discharge rate and stable quality over a long period of time, so it has been used in analog long-life watches.

However, batteries using NaOH as an electrolyte have a significant internal resistance at low temperatures. When a large current is applied to the battery at low temperatures, such as when lighting a lamp, the voltage drop across the battery is high.

The results are shown in FIG. FIG. 1 shows a battery voltage/applied current diagram based on experimental results when a large current is applied at -10° C. using a battery using NaOH as an electrolyte.

In this experiment, the battery was placed in a constant temperature bath at -10° C., and the battery voltage was measured when the lamp was turned on for a certain period of time and when the lamp was turned off.

Here, setting the lamp current consumption from the lighting effect (when explaining the lighting effect, it must be explained by the brightness of the lamp and the lumens), but since the brightness of the lamp and the lamp current consumption have an almost equal relationship, (Here, the lamp consumption current will be explained as a substitute value.) Approximately 5 mA is required.

When a lamp with a current consumption of 5 mA is lit at -10°C, the battery voltage using NaOH as an electrolyte decreases to about 0.7 V < 1.5 mA after about 5 to 10 m seconds.
3 V < Return to leprosy.

In addition, after about 10 milliseconds when the lamp is turned off from being lit,
The voltage returns to normal (lamp off).

The battery voltage required to operate the motor is generally around IV, so based on the results of this experiment, if the lamp is turned on at low temperatures, the voltage will drop below the motor operating voltage, which will hinder motor operation and cause a time delay. I end up.

This is a fatal quality problem for watches, and NaOH
It was extremely difficult to create an illuminated analog clock using a battery with electrolyte.

However, for watches that use batteries as an energy source, a watch with a long battery life is a very advantageous product due to the hassle of battery replacement.As mentioned above, in order to achieve a long-life watch, NaOH In terms of quality, it is most stable to use a battery that uses the electrolyte , and it is used in most products.

For this reason, it was difficult to equip these long-life analog clocks with lighting devices such as lamps due to poor quality and reliability, such as the motor stopping at low temperatures as mentioned above.

The present invention solves these contradictory problems and improves the circuit configuration in order to provide a long-life analog clock equipped with a night illumination device.

The circuit configuration according to the present invention is characterized in that the lamp is turned off while an output signal is flowing from the circuit to the motor, and for a certain period before and after that, thereby increasing the reliability of motor operation.

This will be explained in detail below using the drawings.

FIG. 2 shows a circuit diagram according to the present invention, and FIGS. 3a and 3b.

The timing chart is shown in c2d1etftg.

When the lamp switch 20 (SW) is in the ON state, the switch output obtains the following output waveform.

That is, an oscillation signal from a crystal oscillator 1 or the like, which is a time standard source, is frequency-divided by a frequency dividing circuit 2, and a 1/2 H2 signal is given to a flip-flop 3 (hereinafter referred to as FF).

Similarly, FF3 is given a signal of 1KH2 from the frequency dividing circuit, and the output signal Q3 of FF3 is delayed by 1 m5ec.

FF4 receives the output signal from FF3 and the frequency dividing circuit.
8H2 signal is given, and the output signal of FF4 is
For the output signal of 6.8. This will result in a delay of m5ec.

FF5 receives lK from the output signal from FF4 and the frequency dividing circuit.
The H2 signal is applied, and the output signal of FF5 is delayed by 1 m5ec with respect to the output signal of FF4.

Here, the 1/2 H2 output signal from the frequency dividing circuit and the FF
By inputting the output signal Q of FF 5 to the AND gate 10, the output Q5 of FF 5 is in a HIGH state (hereinafter referred to as H).
Correspondingly, the output of the AND gate 10 becomes H state.

When input to the NOR gate 11, which is an ANDNO gate, the output of the NOR gate becomes a LOW state (described below), and even if the switch 20 is turned on, the AND gate 12 remains in the L state, and the transistor 14 remains in the OFF state. Lamp 15 does not light up.

When the output Q5 of FF5 becomes L state, the output of AND gate 10 becomes L state.

When this output is input to the NOR gate 11, the output of the NOR gate 11 becomes H state, and similarly, the AND gate 12
is maintained in the H state, and when 5W13 is in the ON state, the transistor 14 is also in the ON state and the lamp 15 is lit.

Next, to explain the L state of the 1/2 H2 signal,
FFs 3, 4, and 5 provide the same timing as described above.

In this state, the same state as described above can be obtained by inputting the signal obtained by inverting the output of 1/2 H2 of the frequency dividing circuit by the inverter 16 and the output signal Q5 of FF5 to the ANDNO gate.

The following details are the same as those described above, and will therefore be omitted.

The circuit configuration according to the present invention can be achieved if a pulse signal for motor operation can be sent during the time when this lamp is off.

To do this, the output signal Q3 from the FF3 and the output signal Q4 from the FF4 may be input to the AND gate 18 and the NOR gate 19 to obtain respective output signals.

That is, by inputting the output signal Q3 of FF3 and the output signal Q4 of FF4 to the AND gate 18, an output signal of 6.8 m5ec is obtained from the AND gate 18, which is used as a motor operation signal.

That is, according to this circuit configuration, 1m5e before and after the motor operation
The lamp can be turned off for 8.8m5ec including c.

In other words, according to this configuration, even if the lamp switch 2.0 is input just before the drive pulse is generated, the 1 m5ec lamp current is stopped before the drive pulse is generated, and during this period, the minimum required approximately 1 m5ec for driving the motor is ■The voltage can be secured and stable operation can be expected.

In addition, the motor generates a large induced voltage immediately after the drive pulse ends, making it extremely unstable, but by stopping the lamp current during this period, the negative influence of the lamp current on motor drive can be completely eliminated. There is.

Regarding turning off the lamp for 8,8 m5ec,
As a result of the experiment, it can be said that there is no problem with the afterimage effect and there is no influence on the flickering sensation and lighting effects.

Furthermore, from the results of experiments, it has been confirmed that even if a signal of about 40H2 is applied, there is no effect on the lighting effect, and it is possible to turn off the lamp for a longer time than the lamp is turned off as described in the present invention. be.

The circuit configuration according to the present invention is as described above, but as described above,
Since the lamp can be turned off while the output signal is flowing from the circuit to the motor and for a certain period before and after, there is no problem with the motor operation, so it is possible to provide a high-quality illuminated analog clock.

Further, by using the circuit according to the present invention, it is possible to commercialize a long-life analog clock equipped with a lighting device such as a lamp, which is the intended purpose, and the effect is significant.

[Brief explanation of the drawing]

FIG. 1 shows the battery voltage when a large current is applied at -10° C. when using a battery using sodium hydroxide as an electrolyte. FIG. 2 shows an embodiment of the circuit configuration according to the present invention. Figure 3 a, b, c, d, e. f2g shows the timing flowchart of FIG. 15... Lamp, 20... Switch.

Claims (1)

[Claims] 1. A lighting device for an analog clock that includes an electronic circuit including an oscillation/frequency dividing circuit of a battery 2-hour standard generator, a motor that is intermittently driven by a pulse signal of the electronic circuit, and a light source for illumination as a lighting device, wherein the lighting device In the apparatus, the lighting device is connected to a gate circuit that receives a signal from a lamp switch and a signal from a lights-off time control means, and the lights-off time control means controls a certain period of time before and after the drive pulse signal of the motor. An illumination device for an analog timepiece, characterized in that the illumination device for an analog timepiece is configured to generate a signal to turn off the illumination light source continuously for the driving pulse signal generation time.