JPS62198084A - Candle-type desk lamp - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field 1] The present invention relates to a desk lamp with a candle lit.

[Lamp technology 1] In general, lamps that imitate candles are useful at parties because they are brighter than real candles (and can be lit for a long time), but conventional lamps of this type are It has the disadvantage that it does not shake or disappear even when sprayed with it, so it cannot create a natural atmosphere.

Therefore, by placing a sensor that detects wind pressure near the lamp,
A desk lamp has been proposed that uses a lamp to function in the same way as a candle, but if a temperature sensor such as a heater wire is used as a simple sensor to detect wind pressure, it is likely to malfunction due to changes in ambient temperature or a drop in battery voltage. There were drawbacks.

[Objective of the Invention 1] The present invention has been made in view of the above points, and it is an object of the present invention to prevent malfunctions caused by changes in ambient temperature or power supply voltage in a candle-shaped desk lamp that uses a simple temperature sensor as a sensor for detecting wind pressure. The purpose is to prevent

[Disclosure of the Invention] The present invention provides a desk lamp in which the lamp is turned off by inputting the terminal voltage of a temperature sensor for detecting wind pressure disposed near a candle-shaped lamp to a lighting control circuit. The terminal voltage is input to the lighting control circuit via a capacitor, and it does not detect large or slow changes such as a drop in battery voltage or a change in room temperature, but only detects sudden changes due to wind pressure. The feature is that it is designed to detect.

``Example'' Fig. 1 shows a basic configuration diagram of the present invention, in which a temperature sensor S such as a heater wire is placed near a lamp L imitating a candle to detect wind pressure. sensor S
The lighting control circuit CT is provided with a lighting control circuit CT which receives the output of the lamp L, controls a switching element Q inserted in series with the lamp L, and turns off the lamp L.

Figure 2 (&) is an example of a lighting control circuit CT, which shows an example of a circuit that turns off the light automatically after detecting wind pressure, for example, for several seconds to 10-odd seconds, and supplies the power supply voltage VDD through the resistor R7. The output of the temperature sensor S is
After being amplified by 3t (amplification degree = Rs/Rz) by an inverting amplifier circuit 1 using a CMOS inverter I via a capacitor C1, the waveform is shaped by a CMOS inverter 2, and the rectangular wave output is converted into a monostable multi-circuit 2. is input. The output of this monostable multicircuit 2 controls a switching element Q1 connected in series with the lamp via an output circuit 3. The monostable multi-circuit 2 can be easily constructed using a general-purpose timer IC 4 and time constant circuits C2 and R, for example, as shown in FIG.

Figure 3 explains the operation of the above circuit.
a to Ve respectively indicate voltage waveforms at points a to e in Figure 2.1 Normally, the voltage Va across the temperature sensor S is at a constant level (e.g. 2V), and this level gradually increases with room temperature. This change is caused by capacitor C1.
The input voltage vb of the inverting amplifier circuit 1 is not affected. When the temperature sensor S detects wind pressure at time t1, the voltage across the capacitor CI changes, and the input voltage vb of the inverting amplifier circuit 1 changes. This amplified output Vc
is the threshold voltage of inverter I2 (VTH=
3.2V), the output Vd of the inverter I2 is inverted, the monostable multi-circuit 2 operates, and the lamp L is turned off for a certain period of time (tz to t3) via the output circuit 3.

tp14 and FIG. 5 show other embodiments, in which an operational amplifier OP is used as the inverting amplifier circuit 1 in FIG.
In addition to using a differential amplifier using
2, the sensitivity is improved by using a comparator OP2 whose reference voltage is the terminal voltage Va of the temperature sensor S. According to this configuration, in particular, the inverting amplifier circuit output Vc
Since the amount of change changes in the opposite direction from the reference voltage Va, high operating sensitivity can be obtained even when the sensor current is set small or when the power supply voltage drops.

[Effects of the Invention] As described above, the candle-shaped desk lamp according to the present invention has the following advantages:
Since the terminal voltage of a temperature sensor for detecting wind pressure placed near the lamp is input to the lighting control circuit via a capacitor, there is a risk of malfunction due to slow voltage changes due to changes in indoor temperature or drop in power supply voltage. It has the advantage of not having

[Brief explanation of drawings]

Fig. 1 is a schematic block diagram of the candle-shaped desk lamp of the present invention, Fig. 2 (aHb) is a specific circuit diagram of the same as above, Fig. 3 is a waveform diagram showing the operation of the same as above, and Fig. pIIJ4 is a specific circuit of another embodiment. FIG. 5 is a waveform chart showing the same operation as above. 1 is an inverting amplifier circuit, 2 is a monostable multi-circuit, 3 is an output circuit, L is a lamp, S is a temperature sensor, and Q. is a switching element, and CT is a lighting control circuit. Agent Patent Attorney Ishi 1) Chief 7 Figure 1 q Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] (1) In a desk lamp that turns off the lamp by inputting the terminal voltage of a temperature sensor for detecting wind pressure placed near the candle-shaped lamp to a lighting control circuit, the terminal voltage of the temperature sensor is used to turn on the lamp via a capacitor. A candle-shaped desk lamp characterized by having an input to a control circuit.