JP2000050103A - Repeating amplifier for catv - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the casings or the like of a repeating amplifier for CATV from being forgotton to be closed. SOLUTION: In a repeating amplifier for CATV, where an amplifier and the like are stored in opening/closing casings 1 and 2, a sensor switch 3 sensing the opening/closing and an annunciator 4 emitting sound or light switched with turning on/off the sensor switch 3 are installed in the casings 1 and 2. The annunciator 4 is a display light and it is desirable to be fitted to a position viewed from outside of the casings 1 and 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a CATV repeater amplifier, and more particularly, to an externally open / closed state of a housing.

[0002]

2. Description of the Related Art A relay amplifier of a CATV system has an openable / closable housing called a clamshell having excellent internal protection performance. This housing is provided with a sensor switch for detecting the opening and closing thereof, and the status of the sensor switch can be notified to a monitoring device on the center side by a status monitor built in the relay amplifier. For example, as shown in FIG. 3, a pusher C is provided on one side and a switch D is provided on the other side of a housing (consisting of a main body A and a lid B) which is opened and closed, and the housings A and B are closed. And the pusher C presses the switch D to close (or open) its contact, and the lids A and B
Is opened, the pressing of the switch D by the pressing tool C is released and the contact is opened (or closed). The open / closed state of the contact can be transmitted to the center through the status monitor E. Therefore, if the worker forgets to close the casings A and B after the work, or if another person unreasonably opens the casings A and B, this is automatically notified to the center through the status monitor E,
The relay amplifier can be protected from failure or mischief due to inundation of rainwater.

[0003]

In a conventional relay amplifier, the opening / closing of the housing is detected by a status monitor and transmitted to the center. Therefore, in a unidirectional CATV system or a relay amplifier not provided with a status monitor, the housing is not provided with a housing. Opening and closing could not be monitored. Even with an amplifier that has a status monitor that can monitor the opening and closing of the housing at the center, the housing cannot be opened or closed at the site. It was hard to do.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to enable a relay amplifier used in a unidirectional CATV system or the like to confirm opening and closing of a housing.

The CATV relay amplifier according to the first aspect of the present invention is a CATV relay amplifier in which an amplifier or the like is housed in the housings 1 and 2 which are opened and closed. And an alarm 4 that emits a sound or a light that is switched when the sensor switch 3 is turned on or off.

In the CATV repeater amplifier according to a second aspect of the present invention, the annunciator 4 is an indicator light,
2 is mounted at a position visible from the outside.

According to a third aspect of the present invention, in the CATV relay amplifier, the alarm (4) is a buzzer, a sound generator for music or the like.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (Embodiment 1) FIGS.
(C) shows an embodiment of a CATV repeater amplifier according to the present invention. This relay amplifier has clamshell-type housings 1 and 2 as shown in FIGS. 1A and 1B, and houses therein an amplifier circuit (not shown), a power supply circuit (AVR) and the like. , A tangential line 10 for connecting a signal line, a power supply line, etc. to the outside
Is abutting. The housings 1 and 2 are made of aluminum die-cast, and include a main body 1 attached to and suspended from a messenger wire, and a lid 2 attached to the main body 1 so as to be openable / closable and detachable. The lid 2 is connected to a hinge 11 at a lower portion of the main body 1 and can be opened and closed, and can be detached from the main body 1 by removing a pin of the hinge 11 or the like. The main body 1 and the lid 2 can be fastened by bolts (not shown) at upper and lower portions.

One of the housings 1 and 2 is provided with a rod-shaped pusher 6 at a portion facing the main body 1 and the lid 2 when the housing is closed, and the other is provided with two electrode plates 7 and 8. When the lid 2 is closed, the pusher 6 pushes one of the electrode plates 7 and 8 to
When the lids 2 are opened, the pressing of the electrode plates 7 and 8 by the pusher 6 is released, and the conduction of the electrode plates 7 and 8 is released. A sensor switch 3 for sensing is provided. As shown in FIG. 1C, one of the two electrode plates 7 and 8 is connected to a power supply circuit (AVR) inside the housing via a resistor R, and the other is a display provided on the lid 2. The indicator lamp 4 is turned on when the electrode plates 7 and 8 are connected and connected to a lamp (notifier) 4. The other electrode of the indicator lamp 4 is grounded to the housings 1 and 2.

Although the indicator lamp 4 uses an LED, other types of lamps can be used. The indicator light 4 is attached to the lid 2 so that it can be seen from the outside, so that even when the lid 2 is closed, the light is turned on / off from outside (from below when suspended).
It can be easily checked. The indicator 4 may be turned on when the lid 2 is opened and turned off when the lid 2 is closed. Alternatively, the indicator 4 may be illuminated in two colors, and when the lid 2 is opened, the indicator 4 turns green when closed. You may make it light.

(Embodiment 2) In the present invention, a buzzer may be attached as the alarm 4 as shown in FIG. However,
The buzzer 4 sounds when the housings 1 and 2 are opened,
To stop sound when closed. Therefore, the sensor switch 3 is turned on when the electrode plates 7 and 8 are turned on.
You have to change the circuit to make it sound. Note that the buzzer 4 can be provided inside the housing or outside the housing.
Holes must be provided so that the sound of the buzzer 4 is notified to the outside.

[0012]

According to the CATV relay amplifier of the present invention, when the housing is opened, it is turned on by the indicator 4 such as an indicator lamp or a buzzer.
Therefore, it is possible to prevent the attendant from forgetting to close the housing, and it is possible to easily confirm that the housing has been forgotten to be closed at the time of a round-trip inspection. In addition, even when the casing is opened improperly, it can be easily confirmed by a round-trip inspection. If the inhabitants of the vicinity are informed of the meaning of the alarm 4, it is also possible to notify the center of forgetting to close the casing to the center by the cooperation of the inhabitants and to know the abnormality at the center.

[Brief description of the drawings]

1A and 1B are embodiments of a CATV relay amplifier according to the present invention, in which FIG. 1A is a front view with a housing opened, FIG. 1B is a side view of FIG. 1A, and FIG. FIG. 3 is a schematic diagram of a sensing circuit.

FIG. 2 is another embodiment of the CATV relay amplifier according to the present invention, and is a schematic diagram of a housing open / close detection circuit using a buzzer.

FIG. 3 is a schematic diagram of a housing opening / closing detection mechanism in a conventional CATV relay amplifier.

[Explanation of symbols]

 Reference Signs List 1 housing (main body) 2 housing (lid) 3 sensor switch 4 annunciator

Claims (3)

[Claims] In a CATV relay amplifier in which an amplifier or the like is housed in a housing (1 or 2) which opens and closes, a sensor switch (3) for detecting the opening and closing is provided in the housing (1 and 2). And an alarm (4) that emits a sound or a light that switches as the sensor switch (3) is turned on and off. 2. The CATV repeater amplifier according to claim 1, wherein said annunciator (4) is an indicator light, which is mounted at a position visible from the outside of the housing (1, 2). . 3. The CATV repeater amplifier according to claim 1, wherein said annunciator (4) is a sound generator such as a buzzer or music.