JPS59174786A - Electronic timepiece with lighting device - Google Patents

Abstract

PURPOSE:To prevent malfunctioning while enabling reduction in the current consumption by controlling the lighting of a lamp according to an output signal of an illumination detecting circuit as detected a specified time before when an infrared rays detecting circuit generates an output signal detecting an infrared ray in an automatic lighting system. CONSTITUTION:A signal (a) of a high frequency generated from an oscillation circuit 1 is divided with a division circuit 2 and as soon as it is inputted into a timepiece circuit 3, output signals phi1 and phi2 are outputted. Here, infrared rays released from a human body or the like is detected with an infrared ray sensor 4, a signal (b) is outputted and after it is amplified with an amplification circuit 5, a signal (c) is outputted. The signal (c) is inputted into a voltage variation detecting circuit 6 and when the voltage variation of the signal (c) is above the specified level, a signal (d) is outputted. Then, the output signal (d) is inputted into a timer circuit 7 and outputted for a specified time as a signal (e). As soon as the signal (c) is inputted into the variation detecting circuit 6 while being done into a level discriminator circuit 8 and outputted only while the voltage is above a specified value to generate a signal (f). On the other hand, an illustration sensor 9 outputs an signal (g) in proportion to the ambient illumination.

Description

[Detailed Description of the Invention] In recent years, digital electronic watches have come to be realized at a low price and are easy to read the time, have multiple functions such as alarms, and more. There are many watches on the market. However, in order to check the display part of a conventional digital electronic clock in the dark such as at night, illumination with a lamp is essential, but it is necessary to read the time displayed on the display part and to operate alarms, etc. Sometimes, in order to illuminate the display section, the user must keep pressing the lamp button, which causes inconvenience when the user is restricted from using both arms during operation.

However, in recent years, advances in technology have led to the development of infrared sensors such as hot tears, which can be put to practical use in wristwatches in terms of performance such as sensitivity, size, and price. It became capable of detecting infrared rays. Therefore, by combining an illuminance sensor using an amorphous solar cell, etc., an automatic system that automatically illuminates the display section without pressing any buttons or other actions when the user brings a part of the human body, such as the face, close to the watch in the dark. It became possible to realize a lighting system.

However, with the above-mentioned system that turns on a lamp when infrared rays emitted from a human body etc. are detected in the dark, even when the surroundings are bright during the day and there is no need to illuminate the display, the illuminance sensor and infrared sensor can be turned on by hand. When the detection part is covered,
The illuminance sensor had the disadvantage that it would detect darkness and at the same time the infrared sensor would detect infrared rays emitted from the hand, causing it to malfunction. Furthermore, since it is necessary to keep the amplifier for amplifying the signal output from the illuminance sensor in constant operation, it is undesirable in terms of current consumption when it is made into a single watch size6.An object of the present invention is to prevent the above-mentioned malfunctions. An object of the present invention is to provide an electronic timepiece with an illumination device having an automatic illumination system capable of reducing current consumption.

To achieve the above object, the present invention detects infrared rays in an automatic lighting system, and when the infrared detection circuit emits an output signal, the output signal of the illuminance detection circuit detected a predetermined time ago is used to detect the lamp. It is to control the lighting.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a circuit diagram of an electronic timepiece according to the present invention, and FIG. 2 is an explanatory diagram of the operation of the circuit shown in FIG.

1 is an oscillation circuit, 2 is a frequency dividing circuit that divides the signal a generated by the oscillation circuit 1, 3 is a clock circuit, and 4 is an infrared sensor, which outputs a voltage signal S in proportion to the change in the amount of infrared ray a. do. 5 is an amplifier circuit for amplifying the signal C output from the infrared sensor 4; 6 is for detecting a voltage change in the signal C output from the amplifier circuit 5; 7 is a timer circuit that generates an output signal e for a predetermined time from the output signal dK of the change detection circuit 6; 8 is a timer circuit that outputs an output signal e when the voltage level of the signal C is equal to or higher than a predetermined level; 9 is an illuminance sensor which emits a signal g in proportion to the illuminance.

10 is a circuit 2 which adds the signals l and g, which have the same period and different phases, and outputs the signal g, which is generated from the frequency dividing circuit 2.
11 is the human-powered OR gate 1.
o output signal. operates for a predetermined period of time after it is entered,
This is an amplification circuit that amplifies the signal g emitted from the illuminance sensor 9 and outputs the signal g. 12 is the signal -
Judgment of the output level of 11 is carried out at the cycle of the above-mentioned signal.
, an illuminance detection circuit that outputs a signal 1 when the output level is below a predetermined output level; 16 is an illuminance detection circuit that outputs the output signal 1 of the illuminance detection circuit 12 as an output signal J or k by means of the signals Da 1 and Da 2; The switching circuit 14 stores and holds the output signal J of the switching circuit 13 until the next signal is output from the switching circuit 16, and outputs the output signal J! 15 is a memory circuit that stores and holds the output signal k of the switching circuit 13 until the next signal is output and emits an output signal m; 16 is a memory circuit that outputs the signal 4 output from the memory circuit 14 and the output signal m; A switching circuit 17 controls the alternating output of the signal m output from the memory circuit 15 using the signals 961 and 962; 17 is the switching circuit 16;
18 is a lamp lighting circuit which outputs a signal p and controls the lamp lighting by three human power signals: the output signal n of the timer circuit 7, the output signal e of the timer circuit 7, and the output signal f of the level determination circuit 8. .

As shown in FIG. 1, in the electronic timepiece having the above configuration, a high frequency signal a is generated by an oscillation circuit 1, divided by a frequency dividing circuit 2, and input to a clock circuit 6. At the same time, as shown in FIG. output signals z1 and χ2. Here, the infrared sensor 4 detects infrared rays emitted from the human body, etc., and outputs a signal C as shown in FIG. 2, which is amplified by the amplifier circuit 5 and outputs a signal C shown in FIG. ...The signal C described in (■) is input to the voltage change detecting circuit 6, and when the voltage change of the signal C is equal to or higher than a predetermined level, a signal d is outputted as shown in FIG. The output signal d is then input to the timer circuit 7 and output for a predetermined period of time as signal C shown in FIG.

At the same time as the signal C is input to the change detection circuit 6 (((8 level determination circuits are also input, the signal C is output only during a period when the voltage level of the signal C is equal to or higher than a predetermined level, as shown in FIG. 2). On the other hand, the illuminance sensor 9 outputs a signal g shown in FIG. 2 in proportion to the surrounding illuminance. Here, the signal g shown in FIG. 9
62 outputs a signal as shown in FIG.

Further, the output signal g is amplified by the amplifier circuit 11 which operates for a predetermined period after the signal g is inputted.
The signal I shown in the figure becomes

As a result, the above-mentioned signal is input to the illuminance detection circuit 12,
The voltage level of the signal 1] is determined at the cycle of the signal do. The signal l is input to a switching circuit 16, and when the signal g is input as a switching signal, the switching circuit 16 outputs a signal j shown in FIG.

As a result, the signal j is input to the memory circuit 14, and is stored and held until the next signal J is input to the memory circuit 14, and the signal l shown in FIG. 2 is output.

Further, when the signal DA is inputted to the switching circuit 13 as a switching signal, the switching circuit 16 sends a signal k shown in FIG.
is output.

As a result, the signal is input to the memory circuit 15 and stored and held until the next signal k is input to the memory circuit 15, thereby outputting the signal m shown in FIG. Here, the signals l and m are input to the switching circuit 16, and if the signal G is input as a switching signal to the switching circuit 16, the signal D is input as the next switching signal. , the signal l as the output signal n of the switching circuit 16.
When the switching signal 912 is inputted, the signal m is passed as the output signal l of the switching circuit 16 until the next switching signal 912 is inputted.

As a result, the output signal n has the same period as the switching signal y3, and the judgment signal 2. The detection result of the illuminance sensor 4 before - period is output. Here, the control circuit 17 that controls lamp lighting includes the output signal e of the timer circuit 7 as shown in FIG. The output signal n of the switching circuit 16 as shown is input.

As a result, when the infrared rays emitted from the human body are detected, the change in the output voltage of the infrared sensor 4 and the voltage level exceed a predetermined value, and the judgment signal is output from the switching circuit 16 by the detection of the illuminance sensor 9 one cycle before. Only when the signal n is 1, that is, the ambient brightness is below a predetermined level, the control circuit 17 outputs the signal p as shown in FIG. 2, and the lamp lighting circuit 18 operates.

As mentioned above, according to the invention, by always using the detection result one cycle earlier than the signal periodically detected by the illuminance sensor as the illuminance detection signal to control lamp lighting, the infrared sensor and illuminance sensor can be used during the daytime etc. This not only prevents malfunctions when the sensor is covered with one's hand, but also eliminates the need to constantly operate the amplification circuit to amplify the output of the illuminance sensor, reducing current consumption for illuminance detection. It has the great effect of becoming.

[Brief explanation of drawings]

FIG. 1 is a circuit configuration diagram of an electronic timepiece with automatic illumination according to the present invention, and FIG. 2 is an explanatory diagram of the operation of the circuit shown in FIG. 1.

Claims (1)

[Claims] An electronic watch comprising: an illumination sensor that detects illuminance; an infrared sensor that detects infrared rays emitted from the outside; and a control circuit that controls lighting of a lighting device based on the detection results of the illuminance sensor and the infrared sensor. When the sensor detects infrared radiation emitted from the outside,
An electronic timepiece with a lighting device, characterized in that whether or not the lighting device is turned on is controlled based on a detection result of the illuminance sensor a predetermined time ago.