JPH09312114A - Switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a switch which is not allowed to malfunction even in a humid state. SOLUTION: A switch is equipped with a printed circuit board 20 which has a switch element SW2 and a sending and receiving portion 20a which outputs a signal when the switch element SW2 is pushed, a body portion 15a containing the printed circuit board 20, and a cover portion 15b which is fitted to the body portion 15a. Sealing material 27 is filled into the body portion so as to seal the printed circuit board, a through hole 28 is provided in one face of the body portion 15a, and the tip of a signal line K1 inserted into the body portion 15a via the through hole 28 is connected to the printed circuit board 20 so that the sending and receiving portion 20a outputs a signal via the signal line L1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switch of a remote monitoring control system for remotely controlling lighting control of a lighting device.

[0002]

2. Description of the Related Art A switch of a conventional remote monitoring control system will be described with reference to FIGS. FIG. 4 is a system configuration diagram of the remote monitoring control system. FIG. 5 is an exploded perspective view of the switch. FIG. 6 is a block diagram of a circuit provided on a printed circuit board provided inside the switch.

In FIG. 4, 1 is a central control unit, 2 is a control terminal unit, 3 is a switch, and 4 is an illuminating device.

The switch 3 and the control terminal 2 are connected to the central control unit 1 via a two-wire transmission line, and the central processing unit 1 outputs address data for individually calling each switch 3 and the control terminal 2. Each switch 3 and the control terminal 2 are individually accessed by outputting a transmission signal containing the signals to the transmission line by time division multiplex transmission.

When the central processing unit 1 receives the detection signal from the switch 3 during the signal return period set in synchronization with the transmission signal, it creates a control signal based on the detection signal and responds to the switch 3 which generated the detection signal. The control signal is transmitted to the control terminal unit 2 which has been operated.

The control terminal 2 controls the lighting device 4 according to the received control signal. In the remote monitoring control system configured as described above, when the switch 3 is pressed by the operator, the lighting device 4 corresponding to the switch 3 is turned on or off.

As shown in FIG. 5, the housing 5 of the switch 3 is composed of a body portion 5a and a cover portion 5b. The fitting hole 6a of the engaging portion 6 projecting upward from both ends of the body portion 5a. In addition, the protrusions 7 formed on the lower portions of both ends of the cover portion 5b are elastically fitted to each other to integrally combine the body portion 5a and the cover portion 5b. Here, a portion of the protrusion 7 that overlaps with the engaging portion 6 is recessed in a shape that substantially matches the shape of the engaging portion 6 to facilitate the combination.

One end side of the body portion 5a is projected downward, and a terminal 8 for connecting a signal line (not shown) is attached to the lower surface of this projection portion. Here, the terminal 8 is an L-shaped terminal plate 8
a and a terminal screw 8b with a washer screwed to the terminal plate 8a
It is composed of

As shown in FIG. 6, the body portion 5a is provided with circuits such as a transmitting / receiving portion 9a, an optical signal receiving portion 9b, a storage portion 9c, a switch input portion 9d, an LED display portion 9e, and a main control portion 9f. The printed circuit board 9 is provided inside.

The storage unit 9c stores its own address, the switch input unit 9d detects a pressing operation, and the transmitting / receiving unit 9a includes an address stored in the storage unit 9c according to the pressing operation. The detection signal is transmitted to the central control unit. In addition, the optical signal receiver 9b
The optical signal is received from an address setter (not shown), and the address data indicated by the signal is stored in the storage unit 9c. The LED display unit 9e displays the operating state of the lighting device at the address corresponding to the switch 3. The main controller 9f controls the operation of the entire switch.

A printed circuit board 9 is provided at one end of the terminal board 8a.
On the upper surface of the printed circuit board 9, at least the switch element SW1 of the switch input unit 9d, the light emitting diode LD1 and the photodiode PD of the optical signal receiving unit 9b, and the light emitting diode LD2 of the LED display unit 9e.
LD3 is mounted. The light emitting diode uses a red light emitting diode LD2 that indicates that the corresponding lighting device 4 is on and a green light emitting diode LD3 that indicates that the corresponding lighting device 4 is off, so as to display the operating state of the lighting device. I have to.

The cover portion 5b has a central portion protruding upward,
A handle hole 11 for exposing the handle 10 for pushing down the switch element SW so as to be able to move forward and backward is provided on the upper surface of the protruding portion.
And a light receiving window portion 12 for exposing the light emitting diode LD1 and the photodiode PD to receive an optical signal,
A display window portion 13 exposing the light emitting diodes LD2 and LD3 for display is formed. A filter 14a for preventing dust from entering is fitted in the light receiving window portion 12. The cover portion 5b is further covered with a decorative plate 14b and a name plate 14c.

The switch 3 constructed as described above
When the handle 10 is pushed, the handle 10 is pushed down, the switch element SW1 is pushed, and the transmission / reception unit 9a transmits the detection signal S1 including the address stored in the storage unit 9c to the central control device 1.

When an optical signal is sent from an address setter (not shown) by the operation of the operator, the optical signal receiving section 9
Since b receives the signal and stores the address data indicated by the signal in the storage unit 9c, the setting of the address of the switch 3 can be easily changed.

Although such a remote monitoring and control system is mainly used for buildings, it is easy to wire and the address can be set after wiring. Therefore, temporary lighting equipment at a tunnel excavation construction site or a sewer pipe construction site can be used. There is a demand to use it as.

[0016]

However, in the switch as shown in FIG. 5 described above, since the terminal 8 is provided on the lower surface of the body portion 5 and the feed wiring is connected to the terminal 8, the tunnel is formed. Under a high humidity condition such as an excavation work site and a sewer pipe work site, there is a problem that water droplets adhere to the terminals 8 and are corroded, and the detection signal is not transmitted from the switch 3 to the central controller 1.

Further, under the high humidity condition, there is a problem that dew condensation occurs inside the switch 3, the printed circuit board 9 is corroded by the dew condensation, the printed wiring is short-circuited or disconnected, and the switch 3 malfunctions.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a switch that does not malfunction even in a humid condition.

[0019]

In order to solve the above-mentioned problems, the present invention provides a switch element and a transmitting / receiving section which outputs a signal when the switch element is pressed. A switch having a printed circuit board having the same, a body section for accommodating the printed circuit board, and a cover section fitted with the body section, wherein the body section is filled with a sealing material to seal the printed circuit board. To do.

According to the second aspect of the present invention, a through hole is formed on one surface of the body portion, and the tip of the signal line inserted into the body portion through the through hole is connected to the printed circuit board to transmit / receive data. The section outputs a signal through the signal line.

According to a third aspect of the invention, the switch element is waterproof.

According to another aspect of the invention, the cover is provided with an elastic resin including an opening and a handle that covers at least the opening and extends inwardly through the opening to abut the switch element. And a part.

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described with reference to FIGS.
This will be described with reference to FIG. FIG. 1 is an exploded perspective view of the switch. FIG. 2 is a block diagram of a circuit provided on a printed circuit board provided inside the switch. FIG. 3 is a sectional view of the switch.

In FIG. 1, the switch housing 15
Is a substantially box-shaped body portion 15a having an open upper surface, and a cover portion 15b which is a substantially plate body.
The protrusions 17 formed at both ends of the cover portion 15b are elastically fitted into the fitting holes 16 at both ends of the body portion 15a and the cover portion 15b to be integrally combined.

The lead wire L1 is formed on the lower surface of the body portion 15a.
There are two through-holes 18 for drawing the inside. The printed circuit board 20 is provided on the inner surface of the body portion 15a.
Ribs 19 for restricting the position of are provided at four places,
The printed circuit board 20 is internally provided at a predetermined position.

As shown in FIG. 2, the printed circuit board 20 has a transmitting / receiving section 20a, an optical signal receiving section 20b, and a storage section 20.
Circuits such as c, the switch input unit 20d, the LED display unit 20e, and the main control unit 20f are mounted. A lead wire L1 corresponding to a signal line with its tip centered is connected to the printed wiring on the printed circuit board 20 by soldering. A feed line is connected to the other end of the lead wire L1.

The storage unit 20c of the printed circuit board 20 stores its own address, and the switch input unit 20.
d is for detecting the pressing operation, and is for the transmitting / receiving unit 20a.
Is for transmitting a detection signal including an address stored in the storage section 20c to the central control unit in accordance with a pressing operation. The optical signal receiving section 20b receives an optical signal from an address setting device (not shown) and stores the address data indicated by the signal in the storage section 20c. LED
The display unit 20e displays the operating state of the lighting device at the address corresponding to the switch. Main controller 20
f controls the operation of the entire switch.

On the upper surface of the printed circuit board 20, at least the switch element SW2 of the switch input section 20d, the light emitting diode LD1 and the photodiode PD of the optical signal receiving section 20b, and the light emitting diode LD of the LED display section 20e.
2 and LD3 are mounted. The switch element SW2 is a waterproof tact switch, and water droplets do not enter the inside of the switch element. The light emitting diode uses a red light emitting diode LD2 that indicates that the corresponding lighting device is on and a green light emitting diode LD3 that indicates that the corresponding lighting device is off, and displays the operating state of the lighting device. ing.

The cover portion 15b is made of plastic resin and has a central portion protruding upward as shown in FIG. 3, and an opening 21 is provided on the upper surface of the protruding portion 15c. Light emitting diode LD1 and photodiode P
Optical receiving window 22 for exposing D to receive an optical signal
And a display window portion 23 that exposes the light emitting diodes LD2 and LD3 for display. The light receiving window 22
A filter 22a for preventing the intrusion of dust is fitted in.

The protruding portion 15c is the protruding portion 15c.
The entire upper surface except the light receiving window 22 and the display window 23 and the side surface are double-molded so as to be covered with a rubber-based resin 24 corresponding to an elastic resin portion. As shown in FIG. 3, the rubber-based resin 25 in the portion covering the opening 21 is
The handle 26 is thicker than other portions and extends downward to form a handle 26.

In the switch having the above construction, the tip of the lead wire L1 is drawn into the inside through the through hole 18, and the printed circuit board 20 connected to the tip of the lead wire L1 is provided with the rib 19.
After being regulated in position and stored in a predetermined position of the body portion 15a, the sealing material 27 is filled in the body portion 15a. As shown in FIG. 3, the sealing material 27 is a switch element SW.
2, the light emitting diode LD1, the photodiode PD, and the light emitting diodes LD2 and LD3 are filled up to the position of the line AA so as to expose only the upper portions and seal all other portions.

Therefore, when the operator presses the thick rubber resin 25, the handle 26 is pressed down, the switch element SW2 is pressed, and the transmitting / receiving section 20a is stored in the storage section 20c.
The detection signal including the address to be stored in is transmitted to the central controller.

In the switch constructed as described above, the lead wire L drawn out from the inside of the switch is used.
Since the feed wiring is connected to 1 by waterproofing by caulking and sealing, the terminal for wiring connection described in the prior art is not necessary, and therefore the terminal does not corrode.

Further, since the cover portion 15b is double-molded with the plastic type resin and the rubber type resin, it is difficult for water drops to enter the inside of the switch from the handle portion.

Further, even if water droplets enter the inside of the switch or dew condensation occurs inside the switch, since the inside is sealed by the sealing material, the water droplets do not adhere to the surface of the printed circuit board 20, etc. Therefore, no disconnection or short circuit occurs, and the switch element SW2 is waterproof, so that water droplets do not enter the inside of the switch element SW2 and the switch contacts do not corrode.

[0036]

Since the switch of the present invention is constructed as described above, the invention according to claim 1 is characterized in that
In the described invention, since the printed circuit board is sealed by filling the inside of the body portion with the sealing material, the printed circuit board will not come into contact with the water droplets even if water droplets enter the inside of the body portion. There is an effect that the upper printed wiring is not short-circuited / broken, and thus a switch that does not malfunction even under a humid condition can be provided.

According to the second aspect of the present invention, there is provided the first aspect.
In addition to the effects of the invention described above, a through hole is provided on one surface of the body portion, the tip of the signal line inserted into the body portion through the through hole is connected to the printed circuit board, and the transmitting / receiving portion receives the signal line. Since the signal is output via the switch, it does not require a terminal for wiring on the outer surface of the switch, and therefore, even under a humid condition,
It is possible to provide a switch in which terminals do not corrode and malfunction.

According to the invention of claim 3, claim 1
In addition to the effect of the invention as set forth in claim 2, since the switch element is a waterproof type, even if water droplets enter the inside of the body portion and water droplets are generated due to dew condensation inside the body, the water droplets remain inside the switch element. Therefore, it is possible to provide a switch that does not invade, and therefore a contact portion inside the switch element does not corrode and malfunction even under a high humidity condition.

According to the invention of claim 4, claim 1
In addition to the effect of the invention of claim 2 or claim 3, since the elastic resin portion presses the switch element and covers the opening in response to the pressing operation of the operator, it is difficult for water droplets to enter the inside of the body portion. Therefore, even under humid conditions,
It is possible to provide a switch that does not malfunction.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an example of a switch of the present invention.

FIG. 2 is a block diagram of a circuit provided on a printed circuit board provided inside a switch.

FIG. 3 is a sectional view of a switch.

FIG. 4 is a system configuration diagram of a remote monitoring control system.

FIG. 5 is an exploded perspective view showing an example of a conventional switch.

FIG. 6 is a block diagram of a circuit provided on a printed circuit board provided inside a switch.

[Explanation of symbols]

 15a Body part 15b Cover part 20 Printed circuit board 20a Transmitter / receiver part 21 Opening part 24 Elastic resin part 25 Elastic resin part 26 Handle 27 Sealing material 28 Through hole SW2 switch element L1 Signal line

Claims (4)

[Claims] 1. A printed circuit board having a switch element and a transmission / reception section that outputs a signal when the switch element is pressed, a body section that accommodates the printed circuit board, and a cover section that is fitted to the body section. In the switch, the printed circuit board is sealed by filling the body with a sealing material. 2. A through hole is formed on one surface of the body portion, a tip of a signal line inserted into the body portion through the through hole is connected to a printed circuit board, and a transmitter / receiver portion receives a signal through the signal line. The switch according to claim 1, wherein the switch outputs 3. The switch according to claim 1, wherein the switch element is a waterproof type. 4. The cover according to claim 1, wherein the cover has an opening, and an elastic resin portion that covers at least the opening and includes a handle that extends inwardly through the opening and contacts the switch element. The switch according to claim 2 or claim 3.