JPS6124387A - Monitoring device - Google Patents

Abstract

PURPOSE:To operate a lighting means without surprising a visitor when operating a switch at night having the brightness at a place below the regulated value by providing a soft lighting-up circuit for lighting up a lamp and making it brighter gradually and a timer circuit for setting the lighting-up time of the lamp. CONSTITUTION:A timer circuit CK is to set the lighting-up time of a lamp. When an interphone is operated at night, the peripheral brightness is extremely low for lack of light at daytime. Consequently a resistance value of a CDS rises and voltages at both ends of a capacitor C2 keep 4V. When a switch of an interphone slave device IC is operated, a charging voltage of a capacitor C6 is supplied as a base voltage to transistors Tr1 and Tr2 subjected to the Darlington connection through a resistance R11. When a lamp LA is made to light up, and simultaneously a rise of the charging voltage lights the lamp LA gradually. As a result, a person for operating the switch of the interphone slave decive IC will not be dazzled by the lighting for a television camera TC.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a monitoring device having a television camera that is linked to a switch provided in an intercom or the like.

<Prior art> In general, intercoms, chimes,
A monitoring device that has a TV power or a camera that operates when a switch that activates a bell, etc. is equipped with an illuminance detection means that detects the brightness around the entrance, and when the brightness detected by this illuminance detection means exceeds a specified value. If it is, it will not operate, and if it is below the specified value, it will illuminate the entrance with a lamp. Therefore, if it is daytime when the above switch is operated, the brightness at the entrance is above the specified value, so even if the TV camera is operated in daylight without operating the lighting means, visitors at the entrance will not be affected. It's quite watchable. However, when the switch is operated at night, the brightness at the entrance is less than the specified value, so the television camera cannot see the visitors unless the lighting means is activated to illuminate the entrance.

However, with conventional monitoring devices, when a switch is operated at night, the lighting means instantly turns on the light.
The drawback was that the lights dazzled and startled visitors.

<Purpose of the Invention> This invention was made in view of the above-mentioned circumstances, and is designed to enable the switch installed on the intercom etc. linked to a television camera to be turned on at night when the brightness of the place where the intercom etc. linked to the TV camera is installed is below the specified value. To provide a monitoring device which operates lighting means without surprising visitors when operated.

<Structure of the Invention> In summary, the present invention has a lighting means that lights a lamp when a switch provided in an intercom or the like is operated and the brightness detected by the illuminance detection means is below a specified value. A soft lighting circuit that gradually brightens the lamp,
The present invention is characterized in that it is provided with a timer circuit that sets the lighting time of the lamp, so as not to surprise the operator of the intercom or the like.

<Embodiment> FIG. 1 shows a block diagram of a monitoring device according to an embodiment of the present invention.

A part of the call signal generated when a switch provided on an intercom linked to the television camera is operated is input to the signal input circuit n1. The nl signal is a non-polar circuit n2
The signal is smoothed by a smoothing circuit n3, and becomes a driving signal for an illuminance detection circuit n4 that detects the brightness around the intercom. If the brightness around the intercom is above the set value, n4 will not supply a signal to the pulse generating circuit n5, but
If the brightness is below the set value, n4 is the pulse generating circuit n
5. When a signal is supplied from n4 and the pulse generating circuit n5 generates a pulse, it turns on the switching circuit n6. When the switching circuit n6 is turned on, the output of the DC power supply circuit n7 is supplied to the integrating circuit n9, and also drives the one-shot timer circuit n8.

When the output of the DC power supply circuit n7 is supplied, the integrator circuit n9 gradually supplies the output to the amplifier circuit nlO, and the lamp is gradually turned on brightly and softly (nil). Therefore, a person who operates the intercom switch at night will not be dazzled by the illumination of the lamp. The lamp is kept at the rated lighting at n12 until a certain period of time has elapsed since the output of the DC power supply circuit n7 was supplied to the integrating circuit n9. When the output of the one-shot timer circuit n8 turns off after a certain period of time while the lamp is kept in the rated lighting state, the lamp soft smoke quenching circuit n13 gradually dims the lamp kept in the rated lighting state. and clarify.

In the above block diagram, the soft lighting circuit that turns on the lamp and gradually brightens the lamp has n5 to nil as
The timer circuit that sets the lighting time of the lamp is n8. n1
3 corresponds to each.

Next, a specific circuit of the monitoring device shown in FIG. 1 will be explained. FIG. 2 shows a specific circuit diagram of the monitoring device.

In FIG. 2, an ink-pong hanger IC installed at an entrance or the like is connected to an ink-pong sharpener IM. The place where the intercom slave IC is installed is the TV camera T.
Through C, it is possible to monitor the place where the intercom IM is installed on the monitor TV MT. The TV camera TC is activated when the intercom switch is operated and becomes a monitoring system. In addition, a part of the output of the intercom is full-wave rectified by a full-wave rectifier bridge DBI, smoothed by resistors R, R1, and capacitor CI, and P
Guided by UTI. The anode of PUTI is equipped with a diode D+ for preventing discharge and for setting the anode voltage.
Dz, a CDS which is an illuminance detection means for detecting the brightness around the intercom, a capacitor Cx whose charging voltage changes depending on the resistance value of the CDS, and a variable resistor VR are connected.

The variable resistor VR is a resistor that sets a prescribed value (20#, in the embodiment) of the brightness around the intercom. PUT
The cathode of I is connected to the gate of the Cyrisk SCR via a resistor Ra and a noise absorbing capacitor C8. Resistor R3 constitutes a discharge path for capacitor CZ. The timer circuit CK sets the lighting time of the lamp described later, and includes resistors R4 to Rq and capacitors C4 and C.
5 and I) U'r2. Of these, the resistor mR1 is for ensuring the holding current of the thyristor SCR. The cathode of Cyrisk SCR has a resistor R.
1 degree, a soft lighting circuit S that gradually brightens the lamp LA when the brightness detected by the CDS is higher than the specified value.
O is connected. The soft lighting circuit SO consists of Darlington connected transistors T r + + T r
z + resistor R1) and capacitor C6. For the soft lighting circuit SO, the commercial power supply voltage is connected to the transformer T.
A 12V DC voltage is supplied, which is stepped down by R, full-wave rectified by a full-wave rectifier bridge DB2, and smoothed by a capacitor C9.

In the above configuration, during the daytime, the brightness around the intercom is 201 or more, so the resistance value of the CDS is low, and the voltage across the capacitor C2 is 2.0 as shown in the time chart of FIG. It is kept at 5v. Then, the switch of the ink-pong hanger IC was operated and the voltage was 5V.
Even if the input voltage of the full-wave rectifier bridge DBI, which was maintained at
Therefore, the timer CK and the soft lighting circuit SO do not operate, and the lamp LA does not light. Therefore, monitoring of the person who operated the switch of the intercom hanger IC is performed by operating the television camera TC only in daylight.

Next, the operation when operating the intercom at night will be explained. Because there is no glare, the brightness around the intercom is very low at night, and the resistance value of the CDS is high.
The voltage across the capacitor C2 is maintained at 4■. Then, the switch of the intercom hanger IC was operated, and the fourth
As shown in the time chart in the figure, when the input voltage of the full-wave rectifier bridge DBI drops to 3V due to the call signal, the anode voltage becomes higher and PUTI is turned on. P.U.
The on time of TI is the capacitor C charged at 4v.
It is equal to the discharge time of 2 charges. Turning on PUT1 supplies the gate voltage of the Syllisk SCH.
Turn on CR and drive the timer circuit CK and soft lighting circuit SO. That is, by turning on the SIRISK SCR, charging of the capacitors C7 and C6 is started as shown in the time chart of FIG. 4. The charging voltage of the capacitor c6 is supplied as a base voltage to the Darlington-connected transistor Trl, T, 2 through the resistor R0, and the lamp LA is turned on, and the increase in the charging voltage gradually brightens the lamp LA. go. Therefore, the person who operates the switch of the intercom hanger IC will not be dazzled by the illumination for the television camera TC. On the other hand, the charging voltage of capacitor 05' determined by time constant R7C5 is supplied to PLIT2 as an anode voltage.

When the charging voltage of the capacitor C1 reaches 8V, which is higher than the gate voltage of PUT2, which is supplied with the divided voltage value of the resistors R, R8 as the gate voltage, PUT2 is turned on. PUT
2 is turned on, the charge in capacitor c5 is transferred to resistor R6.
At the same time, the cathode of the thyristor SCR has the charging voltage of the capacitor C4 and the capacitor c5.
The sum of the charging voltages is applied, and the thyristor SCR is reverse biased and turned off. When the thyristor SCR is turned off, the voltage at both ends of the capacitor C6 decreases due to discharge, and the voltage at both ends of the lamp LA also decreases, and the lamp LA, which had been lit at its rated value, gradually becomes dark and finally reaches soft clearing.

In the explanation of the operation described above, when the switch of the intercom hoist IC is operated, the person who operated the switch of the intercom hoist IC is monitored using the TV camera TC. By operating the switch, you can also see the status of the location where the intercom hanger IC is installed. The reason for inserting a full-wave rectifier bridge DBl into the intercom input to create a non-polar input circuit is for the above reasons and during connection work with the intercom.
This is because the work can be done more efficiently by eliminating the need to check the polarity.

In the circuit shown in FIG. 2, a CDS is used as the illuminance detection means, but this can also be implemented with an element such as a phototransistor or the like. Furthermore, the soft lighting circuit SO and timer circuit CK are also connected to the program 1 shown in FIG. If the configuration satisfies the diagram,
Various configurations are possible using known means. In addition, although the circuit in Figure 2 shows an example of connection to an interbon, it may also be connected to a chime, hell, etc. that cannot communicate, and the place where this monitoring device can be installed and monitored is limited to the entrance. It can also be used indoors in factories, hospitals, etc.

Furthermore, in the circuit shown in Figure 2, when the lamp LA is turned off, the brightness is gradually reduced to achieve complete clarity, but when the lamp LA is turned off, sufficient time has elapsed since the visitor's arrival. Since there are often no visitors, you may want to immediately extinguish the smoke.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a monitoring device according to an embodiment of the invention, FIG. 2 is a specific circuit diagram of the monitoring device, and FIGS. 3 and 4 are explanations of the daytime operation of FIG. 2, respectively. A time chart is shown to explain nighttime operations. LA-lamp, CD5-illuminance detection means, SO-soft lighting circuit, CK-timer circuit.

Claims (1)

[Claims] (1) When a switch installed on an intercom, etc. is operated, a television camera that operates, an illuminance detection means that detects the brightness around the switch, and a brightness detected by the illuminance detection means that exceeds a specified value In the monitoring device, the monitoring device is equipped with a lighting means that illuminates the area around the switch with a lamp, and the illumination means detects that the switch, etc. is operated and the illuminance detection means detects that the switch or the like is operated. A monitor characterized in that it is provided with a soft lighting circuit that turns on the lamp and gradually brightens the lamp when the brightness is below a specified value, and a timer circuit that sets the lighting time of the lamp. Device.