JPH04162396A - Door light - Google Patents

Abstract

PURPOSE:To light a lamp for a fixed time, even when a door is closed, by providing an open/close condition detecting means of the door, timer means for outputting a door open condition detection signal for a fixed time from the point of time of placing the door in a closed condition and a peripheral light dark condition detecting means. CONSTITUTION:When a door is opened, a timer 8 is reset simultaneously to output an open condition detection signal 1, and peripheral light detection 2 is started. Here, a lamp is lighted when the periphery is dark. To receive no influence by self light emission, a feedback means 4 is actuated so that the peripheral light detection 2 maintains dark condition detection. Since a signal of lighting is generated by a product (AND) of a door open condition detection signal 1 and a peripheral light dark condition, after the door is closed, the reset-released timer 8 starts action to stop the door open condition detection signal after a fixed time and to first put out the lamp.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a door light, in which an illumination light is turned on by a sensor when a door is opened in a dark place.

2. Description of the Related Art The structure of a conventional door light will be described with reference to FIG. A door opening/closing state detection means 1 connected to a battery 7, an ambient light detection means 2 that operates when the door open state is detected, a means 3 for creating a lighting signal based on door open state detection and ambient light/dark state detection, and lighting thereof. It has an output means 5 that amplifies the signal and lights up the lamp 6, and a means 4 that returns the lighting signal to the ambient light detection means 2. With the above configuration, when the door is opened when the surroundings are dark, the light is turned on and until the door is closed. It will keep the lights on.

Problems to be Solved by the Invention When using a door, when there is no light switch nearby, such as when opening the front door or the garage door at night,
I had to walk in the dark to the light switch,
May be dangerous for walking.

Door lights are used to eliminate these inconveniences and dangers, but with conventional door lights, the door must be left open to keep the light on until the light switch is turned on. I had to go back to close the door after turning on the light.

The present invention solves the above problems, and aims to provide a door light that stays on for a certain period of time even when the door is closed.

Means for Solving the Problems The door light of the present invention includes means for detecting the open/closed state of the door using a reed switch connected to a battery and a magnet attached to the door, and a means for detecting the open/closed state of the door when the door open state is detected. a timer means for outputting a detection signal and continuing to output a door open state detection signal for a certain period of time from the time when the door is closed; a means for detecting ambient light when outputting the door open state detection signal; and the timer means. means for generating a lighting signal by ANDing the door open state detection signal of the door open state detection signal and the ambient light/dark state detection signal of the ambient light detection means; output means for lighting a lamp based on the lighting signal; and a means for returning to the detection means and maintaining detection of the ambient light/dark state.

According to the above-described structure, when the door is opened, the timer is reset and at the same time an open state detection signal is output, and ambient light detection is started. At this time, if the surroundings are dark, the lamp will turn on. Further, the feedback means operates so that the ambient light detection maintains dark state detection because it is not affected by its own light emission. The lighting signal is created by the AND of the door open state detection signal and the ambient light/dark state, so after the door is closed, the reset-released timer starts operating and the door open state detection signal is output after a certain period of time. The lamp will go out only after it has stopped.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to FIG. In Figure 1, SW is a reed switch, MG is a magnet attached to the door, and ICI.

IC2, IC3, IC4, IC5 are NAND gates, 6
is a lamp, CdS is a photoconductive cell, Ql, Q2 are transistors, R1, R2, R3, R4, R5° R6, R7 are resistors, C is a capacitor, D is a diode, and 7 is a battery. The operation of the above configuration will be explained below.

When the door is closed, the magnet MG is connected to the reed switch SW.
, and the reed switch SW is closed. In this state, NAND gate fC1 outputs L level, timer capacitor C is discharged through resistor R3, and NAND gate fC1 outputs L level, timer capacitor C is discharged through resistor R3, and
AND gate IC2 receives an L level input and outputs H level, and in response, NAND gate IC3 outputs an L level signal as a door closed state detection signal. At this time N
AND gate IC4 outputs an H level signal, turns off transistors Ql and Q2, and maintains the lamp 6 in the off state, and NAND gate IC5 outputs an H level signal.
In response to the output of , an L level is output, and no voltage is applied to the resistor R4 and the photoconductive cell CdS, so no current flows. In this light-off state, when the door is opened and the magnet MG attached to the door moves away from the reed switch SW, the reed switch SW opens and the NAND gate C1 receives an L level through the resistor R1 and outputs an H level. Capacitor C is thereby charged through protective resistor R2.

Also, NAND gate I, C2 is NAND gate IC1
The NAND gate IC3 receives the H level output and outputs the L level, thereby outputting the H level as the door open state detection signal.
Output the level. And NAND gate IC4 has H
A level signal and a potential divided by the resistor R4 and the photoconductive cell CdS are input. In that case, if the ambient light is bright, the divided potential is the NAND gate IC4.
does not exceed the threshold value, the output continues to be at the L level, and the lamp 6 remains off. On the other hand, if the ambient light is dark, the divided potential exceeds the threshold of NAND gate IC4, and due to the AND of both signals, NAND gate C4 outputs an L-level lighting signal, and transistors Ql and Q2 Turn on the lamp 6 to light it. At the same time, NAND gate IC5 receives the output of NAND gate IC4 and outputs H level, and maintains the divided potential of resistor R4 and photoconductive cell CdS at H level, and the input of NAND gate IC4 is affected by ambient light. A dark signal will be input without receiving any signal. Next, when the door is closed in this state, the NAND gate ICI receives the H level input and outputs the L level.
In place of the NAND gate IC1, while the charged capacitor C discharges through the resistor R3, the lamp 6 is kept lit by inputting an H level to the NAND gate C2 and holding the door open state detection signal for a certain period of time. become. Note that the same function can be achieved even if the NAND gate IC5 is omitted and the photoconductive cell CdS is connected to the collector of the transistor Q1.

Effects of the Invention As is clear from the above embodiments, according to the present invention, when the door is opened, a dark room is automatically illuminated with a lamp, and even after the door is closed, the lamp remains lit for a certain period of time. The light switch can be turned on after closing, providing a convenient and safe door light.

[Brief explanation of the drawing]

FIG. 1 is an electric circuit diagram showing an embodiment of the door light of the present invention, and FIG. 2 is a block diagram of a conventional door light. 1...Door opening/closing state detection means, 2...
Ambient light detection means, 3... Lighting signal generation means, 4
... Return means, 5 ... Output means, 6.
...Lamp, 7...Battery, 8...
・Timer means, SW...Reed switch, MG
······magnet.

Claims (1)

[Claims] The device uses a reed switch connected to a battery and a magnet attached to the door to detect the open/closed state of the door, and when the door is detected to be open, it resets and simultaneously outputs a door open state detection signal, and when the door is closed. a timer means that continues to output a door open state detection signal for a certain period of time from the point in time;
means for detecting ambient light when outputting the door open state detection signal; and means for generating a lighting signal by ANDing the door open state detection signal of the timer means and the ambient light dark state detection signal of the ambient light detecting means. , an output means for lighting the lamp in response to the lighting signal, and a means for returning the lighting signal to the ambient light detection means to maintain the dark state, and when the door is closed, the darkness is achieved by stopping ambient light detection. A door light that reduces the current and has a function of continuing to light for a certain period of time even after the door is closed once the lamp is turned on with the above configuration.