JPH0548146Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The invention relates to a lighting circuit for a watch that illuminates the time display section when a person approaches. This relates to something that lights up when a person stays near the clock to look at the clock without the light on.

(Prior art) As a conventional lighting circuit of this type,
Some of these are used in the watch disclosed in Publication No. 99078.

This watch uses an infrared sensor to collect infrared rays emitted from the human body when a person approaches, and turns on the light for a certain period of time.

(Problem to be solved by the invention) In conventional lighting circuits, even if a person had no intention of looking at the clock, a human body could be detected and the lights would turn on just by passing near the clock.

If the lights turn on every time someone approaches,
It was a waste of battery power.

The purpose of this invention is to turn on the lights when a person stays near the clock to look at the clock, instead of turning on the lights just by passing near the clock.The purpose of this invention is to eliminate unnecessary lighting and save battery power. The goal is to minimize wear and tear.

(Means for Solving the Problem) Generally, when looking at a clock, a person often remains in front of the clock only while reading the time. The amount of time varies, but the time spent in front of the clock is clearly longer than if you were simply passing by the clock.

The present invention focuses on this point, and is configured so that when a person enters the detection area in front of the watch and remains in this area for longer than a set time, the light is turned on. ing. In addition, the set time is varied depending on the previous operating conditions, and is set to the most suitable time for the user after multiple uses.

In addition, if you are unable to stay within the detection area for the set time, by entering the area again within a certain period of time, the lights can be turned on regardless of how long you remain in the area. It consists of

That is, the lighting circuit for a watch of the present invention includes a sensor circuit that detects a human body and outputs a detection signal, and a lighting circuit that illuminates for a certain period of time in response to the generation of the detection signal. The sensor circuit outputs a trigger signal when a human body enters and exits the detection area, and the trigger signal output from the sensor circuit when a human body enters the detection area is used when illumination is being performed and when the human body enters the detection area. a switching circuit that switches and outputs the first and second trigger signals when the second trigger signal is not present, and a timer circuit that outputs a timer signal for a certain period of time from when the second trigger signal first occurs and disappears; A gate circuit that allows a second trigger signal to pass through only when the second trigger signal is generated and applies it to the lighting circuit to perform illumination; a pulse generation circuit that outputs a pulse signal in response to the first trigger signal generation; an up-down counter that counts up and counts down in response to a second trigger signal from the gate circuit, and an illumination stop signal from the lighting circuit and a trigger that is output from the sensor circuit when the human body leaves the detection area. The count value of the up-down counter is preset in response to the generation of the signal, and the trigger signal is activated in response to the generation of the second trigger signal and is output from the sensor circuit when the human body leaves the detection area. A programmable counter circuit that generates an output signal when the count value reaches a set value during the period of time and applies it to the lighting circuit to perform lighting.

(Function) In the lighting circuit of the present invention, when a human body enters the detection area near the watch, the sensor circuit detects this and outputs a trigger signal.

If the illumination is in the off state at this time, the second trigger signal is output from the switching circuit.

The programmable counter circuit operates in response to this second trigger signal.

If the person remains within the detection area while the programmable counter circuit counts up to the set value, the lighting circuit is driven by the signal output from the programmable counter circuit to turn on the lighting. In addition, if a person leaves the detection area and the sensor circuit outputs a trigger signal indicating this before the programmable counter circuit counts up to the set value, the programmable counter circuit will not output a signal and the lighting will turn off. not light.

Further, when a person enters the detection area while the lighting is off, a second trigger signal is generated, and when this second trigger signal disappears, the timer circuit is activated. If a person enters the detection area again while this timer circuit is generating a timer signal that is output for a certain period of time, the gate circuit passes the second trigger signal generated at this time and applies it to the lighting circuit. and turn on the lights.

In this way, by entering the detection area twice within a certain period of time, the illumination can be turned on regardless of the time the object stays in the detection area.

On the other hand, the count time of the programmable counter circuit that determines whether a person has remained within the detection area for a set time is such that the counter value of the up-down counter is preset when the lights are turned off and when the person leaves the detection area. Set by.

The up-down counter counts down by the trigger signal from the gate circuit mentioned above, and by the pulse signal output from the pulse generation circuit in response to the first trigger signal generated when a person enters the detection area when the lighting is turned on. Count up.

In other words, if a person enters the detection area and the lights are turned on twice in a row, it is assumed that the person was unable to wait until the lights were turned on after entering the detection area, and the count value of the up-down counter is changed. This will shorten the count time of the programmable counter circuit, and if more people enter the detection area when the lights are turned on, it will be noted that the user often enters the detection area other than when looking at the clock. It is assumed that the user has turned off the light (by waving his hand many times, etc.) because the light is on unnecessarily, and the count value of the up-down counter is incremented to lengthen the count time of the programmable counter circuit.

Therefore, the time that the sensor stays within the detection area is varied depending on the usage situation.

(Example) An example of the present invention will be described below based on the drawings.

FIG. 1 is a diagram showing the circuit configuration of a lighting circuit for a watch according to an embodiment of the present invention.

2 is a clock circuit that measures and displays the time.

Reference numeral 4 denotes a sensor circuit, which is composed of a pyroelectric infrared sensor 6 and a window comparator 8 that outputs trigger signals A and B when a person enters and leaves the detection area based on its output signal, respectively. .

This window comparator 8, as shown in FIG. 2, consists of two comparators 16 and 18 and resistors 10, 12, 14, 20, and 22.

The comparators 16 and 18 input the signal C from the infrared sensor 6 to the (+) and (-) inputs, respectively, and also input a predetermined reference voltage from between the resistors 10, 12, and 14 connected between the power supplies. They are input to the (-) and (+) inputs, respectively, and their outputs are connected to H level via resistors 20 and 22, respectively, and trigger signals A and B are output from the connection points with these resistors 20 and 22. is being taken out.

Reference numeral 24 denotes a switching circuit, which includes an AND gate 26 which inputs a signal indicating the lighting state or non-lighting state of the lighting outputted from a lighting circuit to be described later and a trigger signal A, and outputs a first trigger signal; It is comprised of an AND gate 28 which inputs an inverted signal indicating the state, and which also inputs a trigger signal A and outputs a second trigger signal.

30 is a programmable counter circuit, which is a flip-flop (hereinafter abbreviated as "FF") which inputs the second trigger signal and trigger signal B to the clock input φ and reset input R, respectively, and has the data input D connected to the H level. 32, an AND gate 34 which inputs the signal from its output Q and the clock signal _φ1 from the clock circuit 2, and inputs its output signal to the clock input φ, as well as an illumination stop signal and trigger signal from the lighting circuit described later. B is connected to reset input R and preset input via OR gate 36.
Preset counter 3 that is input to the PS and presets the count value of the up-down counter, which will be described later.
It consists of 8.

The preset counter in this embodiment is
It counts down from a set value to a constant value in response to a clock signal.

40 is a lighting circuit, and a preset counter 3
8 and a FF 44 which inputs a signal from a gate circuit (described later) to a clock input φ via an OR gate 42 and whose data input D is connected to an H level;
a lamp 46 that inputs a signal from the output Q;
The counter 48 inputs the signal from the output of the FF 44 to the reset input R, inputs the clock signal φ ₁ to the clock input φ, and applies the output illumination stop signal to the reset input R of the FF 44.

50 is a timer circuit which inputs the second trigger signal to the clock input φ via the inverter 52, and inputs the signal from the FF 54 whose data input D is connected to the H level and the output thereof to the reset input R. It also comprises a counter 56 which uses the clock signal φ ₁ as a clock input φ and applies an output signal to the reset input R of the FF 54 .

Reference numeral 58 denotes a gate circuit, which is composed of an AND gate 60 that receives a signal from the output Q of the FF 54 and a second trigger signal, and a one-shot circuit 62 that outputs a trigger signal in response to the output signal of the AND gate 60.

64 is a pulse generation circuit which inputs the first trigger signal to the clock input φ and outputs a pulse signal in response to signals from the FF 66, whose data input D is connected to the H level, and its output Q. It is composed of a one-shot circuit 68.

70 is an up/down counter which inputs the trigger signal from the gate circuit 58 to the down input D, further inputs the pulse signal from the pulse generation circuit 64 to the up input U, and supplies the count value to the preset counter 38. It is something to do.

Next, the operation of the lighting circuit of this embodiment having the above configuration will be explained.

As shown in the time chart of FIG. 3, the infrared sensor 6 in this embodiment changes its output state when a person approaches and when a person moves away, and outputs a positive pulse and a negative pulse.

The comparator 16 detects when the positive pulse generated in the signal C reaches a predetermined voltage, and generates a trigger pulse in the trigger signal A as a result.
Further, the comparator 18 detects when the negative pulse generated in the signal C reaches a predetermined voltage,
Generate a pulse in trigger signal B.

Now, when a person enters the detection area of the sensor circuit 4,
A trigger pulse is generated in trigger signal A.

If the lamp 46 is not lit at this time,
Since the signal from the output Q of the FF 44 that determines the state of the lamp 46 is at L level, the AND gate 28
is in an open state, and a trigger pulse of trigger signal A is generated at its output.

The FF 32 sets its output Q to the H level in synchronization with the rising edge of this trigger pulse, thereby opening the AND gate 34 and transmitting the clock signal φ ₁ generated at its output to the preset counter 38.
to be applied. This preset counter 38 starts counting down from a preset value to a constant value in the initial state.

At this time, when a person leaves the detection area of the sensor circuit 4, the sensor circuit 4 outputs a trigger signal B.
A trigger pulse is generated, and the FF 32 and programmable counter 38 are reset by this trigger pulse. Therefore, programmable counter 3
No signal is output from the output C of 8, and the lamp 46 in the lighting circuit 40 remains in the non-lighted state.

Furthermore, if a person enters the detection area and the hole remains in the detection area while the programmable counter 38 is operating, the FF 32 and the programmable counter 38 will not be reset and the programmable counter 38 will reach a certain value. It continues counting down and outputs an H level signal from output C. The FF 44 inputs this signal to the clock input φ via the OR gate 42, and switches the output Q to the H and L levels, respectively, in synchronization with the rising edge of the signal.

The lamp 46 that receives the signal from the output Q of the FF 44 lights up in response to this signal, and the clock circuit 2
Illuminates the time display inside.

Further, in response to a signal from the output of the FF 44, the counter 48 is reset and starts operating.

Thereafter, the counter 48 operates for a certain period of time, and when a pulse is output from its output C, the FF 44 and the programmable counter 38, which input the pulse to the reset input R, are reset.

Therefore, the output Q of FF44 is L, respectively.
The level becomes H, the lamp 46 goes out, and the counter 4
8 returns to the reset state.

The FF 32 whose output Q is at H level is reset and initialized by a trigger pulse generated in the trigger signal B when a person leaves the detection area.

As mentioned above, when a person enters the detection range of the sensor circuit 4 and stays there for a certain period of time, the light turns on. However, as shown below, if a person enters the detection range more than once within a certain period of time, the light turns on. The lights will also turn on in case of rain.

That is, when a person enters the detection area when the illumination is off, a trigger pulse of the second trigger signal is generated as described above.

This trigger pulse is FF in addition to FF32 mentioned above.
54 is also inverted and applied. This FF5
4 switches its output Q to H and L levels, respectively, in synchronization with the rising edge of the inverted trigger pulse. When the timer signal from the output Q of this FF 54 becomes H level, the AND gate 60 to which it is input becomes open, and the counter 56, which inputs the signal from the output to the reset input R, is reset and starts counting. do.

If a person enters the detection area again, the second
A trigger pulse is generated in the trigger signal. This trigger pulse is generated at the output of the AND gate 60 which is already in an open state, and the one-shot circuit 62 which receives this trigger outputs a predetermined trigger pulse.

This trigger pulse is passed through the OR gate 42.
The signal is applied to the clock input φ of the FF 44, and the FF 44 switches its output state in synchronization with the rising edge of the clock, similarly to the operation described above, and the lamp 46 is lit for a certain period of time.

Incidentally, when a person enters the detection area again and before a trigger pulse is generated in the second trigger signal again, the counter 56 counts for a certain period of time and sets its output C to H level, and this signal resets the FF 54. and set its output Q to L and H levels, respectively. Therefore, the AND gate 60 is closed and the trigger pulse that occurs again in the second trigger signal is not generated at its output.

Therefore, the lamp 46 will not be lit.

On the other hand, in this embodiment, the time the light stays within the detection area to turn on the light, that is, the time counted by the programmable counter 38, is varied depending on the usage situation. Next, this operation will be explained.

The count value of the programmable counter 38 is preset directly to the count value of the up-down counter 70 when a pulse is generated in the illumination stop signal from the counter 48.

Down input D of this up-down counter 70
A trigger pulse from the one-shot circuit 62 mentioned above is applied to.

Therefore, if a person enters the detection area, and if another person enters the detection area within a certain period of time, the count value of the up-down counter 70 is counted down.

Therefore, the programmable counter 38 has
Since this count value is preset and a down count is performed from this count value to a constant value, the time counted by the programmable counter 38 becomes shorter and the illumination is turned on more quickly.

Further, a pulse signal from a one shot circuit 68 is applied to an up input U of this up down counter 38.

That is, when a person enters the detection area when the output Q of the FF 44 is at H level and the lamp 46 is lit, the first trigger signal is output from the AND gate 26 which is open at this time. A trigger pulse is generated.

The FF 66 sets its output Q to H level in synchronization with the rise of this trigger pulse, and in response to the rise, the one shot circuit 68 generates a pulse in the pulse signal. In response to this pulse, the up-down counter 70 counts up, and the count value is preset in the programmable counter 38. Therefore, the time that this programmable counter 38 counts becomes longer, and it becomes necessary to stay within the detection area for a longer time to turn on the light.

In this embodiment, the programmable counter 38 is configured as a subtraction counter, but it may also be replaced with an addition counter. However, in this case, it is necessary to preset the complement.

(Effects of the invention) According to the invention, since the light is turned on when the user stays near the clock to look at the clock, the battery is not consumed due to unnecessary lighting.

In addition, if the illumination does not turn on due to poor approach to the clock, etc., two lights may be placed within the detection area of the sensor.
The light can also be turned on by repeating the same action at least twice, such as going in and out more than once or waving your hand over it.

Furthermore, since the time a person stays within the detection area can be varied depending on the usage situation, the lighting will be turned on in the optimal condition for any user or method of use, further reducing battery waste. It is possible to prevent wear and tear.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the circuit configuration of a lighting circuit for a watch according to an embodiment of the present invention, FIG. 2 is a diagram showing the circuit configuration of the sensor circuit shown in FIG. 1, and FIG. 3 is a diagram showing the circuit configuration of the sensor circuit shown in FIG. This is a time chart. 4...Sensor circuit, 24...Switching circuit, 30...
...Programmable counter circuit, 40...Lighting circuit, 50...Timer circuit, 58...Gate circuit, 64...Pulse generation circuit, 70...Up-down counter.

Claims (1)

[Scope of Claim for Utility Model Registration] A lighting circuit for a watch that includes a sensor circuit that detects a human body and outputs a detection signal, and a lighting circuit that illuminates for a certain period of time in response to the generation of the detection signal from the sensor circuit, The sensor circuit outputs a trigger signal when a human body enters and exits the detection area, and furthermore, the lighting circuit outputs a trigger signal output from the sensor circuit when the human body enters the detection area. a switching circuit that outputs a first trigger signal when lighting is being performed and a second trigger signal when lighting is not being performed; a timer circuit that outputs a timer signal for a certain period of time from the timer circuit; a gate circuit that passes the second trigger signal and applies it to the lighting circuit to perform illumination only while the timer signal is being generated from the timer circuit; a pulse generation circuit that outputs a pulse signal in response to generation of a first trigger signal from the switching circuit; and a second trigger signal that is counted up by the pulse signal from the pulse generation circuit and is output from the gate circuit. an up-down counter that counts down by an up-down counter; and a count value of the up-down counter in response to generation of an illumination stop signal from the lighting circuit and a trigger signal output from the sensor circuit when a human body exits the detection area. is activated in response to the generation of the second trigger signal, and outputs when the count value reaches the set value before the trigger signal is output from the sensor circuit when the human body leaves the detection area. A lighting circuit for a watch, further comprising: a programmable counter circuit that generates a signal and applies it to the lighting circuit to perform lighting.