JPH0516546Y2 - - Google Patents

Description

[Detailed description of the invention] The invention relates to a step clock with LED. The idea was to use a lithium battery as a power source to drive a clock movement that operates in steps at second intervals, and to create a long-life, highly reliable step clock with an LED that lights up in synchronization with the second step. I will provide a.

The gist of the idea is to connect the movement and LED in series to a lithium battery, to ensure proper voltage distribution between the two, and to utilize the movement's second-step current to blink the LED.

This will be explained using drawings.

FIG. 1 is a circuit diagram showing an embodiment of the present invention. 1 is a lithium thionyl chloride battery with a rated voltage of 3.6V. 2 is a movement for a step clock. The movement 2 includes an IC 3, a crystal oscillator 4, a coil 5, a rotor 6, a gear 7, and a pointer 8. The rated voltage of this movement is
The voltage is 1.5V, and the crystal oscillates at a voltage around this.
A step pulse (approximately 20 ms) that is reversed every second is supplied to the coil 5. The rotor 6 performs a step rotation of 180 degrees every second. When the pointer 8 is a second hand, the hand moves in one second increments. The current during the step is about 2 mA, and the current when the step is at rest is about 1 μA. 9 is a red LED connected in series to movement 2. LED9 has a rated voltage of 1.6V or more and lights up in red when a current of 1mA or more flows. When movement 2 is at rest, only about 1 μA of current flows, so the light is off. However, during the step, a current of about 2mA flows, so the LED lights up in red. LED9
If you look at it from above, movement 2 corresponds to a switch that makes the LED blink in 1-second increments.

In this example, when the step is stationary (LED off), 2.0V is applied to movement 2, and 2.0V is applied to LED 9.
1.6V is applied, the current is 1μA, and during stepping (LED lighting), 1.75V is applied to movement 2, 1.85V is applied to LED 9,
The current was 2mA. From the perspective of the movement 2, the LED 9 corresponds to a regulator for applying an appropriate voltage to the movement 2.

Ignoring the battery resistance, calculate each resistance from the above data. LED during step (LED on)
The resistance of 9 is 925Ω, but the step static (LED
When the light is off), it increases to 1.6MΩ. The resistance of movement 2 then corresponds to 875Ω and 2MΩ. The resistance of LEDs is low when the lights are on and high when the lights are off, and this invention takes advantage of this. The LED controls the partial pressure to movement 2 by blinking.

If we were to use a fixed resistor of about 1KΩ in place of the LED, the voltage of 3.6V from battery 1 would be applied to movement 2 when the steps were stationary.
In addition to overvoltage, current consumption increases while the step is stationary, shortening the battery life of the watch.

From this example, the scope of the present invention is that the rated voltage of the lithium battery is 2.8V to 4.2V, the operating range of the step movement is 1.0V to 2.8V,
LEDs are lighted by a current of 1mA or more in the voltage range of 1.6V to 2.4V. In this example, a lithium battery with a capacity of 2AH was used. This step clock continues to run for 10 years with a blinking LED. For a 10-year warranty, the best combination is, for example, a pointer-type watch rather than an LCD one, a large-capacity, long-life lithium battery, and a long-life LED with low current consumption. In addition, to improve isochronism by keeping the voltage to movement 2 constant, move movement 2
A smoothing capacitor should be added to the

In the above explanation, the pointer 8 is used as the second hand, but if the gear reduction is increased and the pointer 8 is used as the minute hand, and a two-hand watch with hour and minute hands is configured, the LED will serve as a 1-second blinking signal instead of the second hand. This is a nice thing because it makes a simple clock.

As mentioned above, the LED 9 blinks to optimize the partial pressure to the movement 2, so depending on the specifications of the watch, the LED may be housed inside the watch.
Even if the blinking is not visible from the outside, it has an effect on the performance of the watch.

Equipped with an LED that flashes at intervals of seconds according to this invention,
Pointer type watches with long lifespan and high reliability are now available.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram according to the present invention. 1...Lithium battery, 2...Movement,
9...LED.

Claims (1)

[Scope of utility model registration request] Lithium batteries rated for voltages between 2.8V and 4.2V, step clock movements capable of operating between 1.0V and 2.8V, and 1.6V
Equipped with an LED that lights up when a current of 1mA or more flows in a voltage range from 2.4V to 2.4V, and the movement and the LED are arranged in series with the battery. step clock.