JPH05175671A - Series unit - Google Patents

Abstract

PURPOSE:To increase the circuit area of a printed-circuit board, to ensure the insulating property of a wiring pattern and an electric element or the like mounted on it from a metal case at the circumference and to prevent a central conductor from being short-circuited when a coaxial cable is connected. CONSTITUTION:A subboard 15 is connected electrically in a direction nearly perpendicular to a main board 14; a circuit area and the like are increased. At this time, an insertion part 161 at an insulating member 16 is situated at a gap between the subboard 15 and the inner wall of a metal case 12. As a result, a prescribed circuit inside a standardized series unit can be designed and arranged easily. In addition, the subboard 15 is insulated surely from the metal case 12 at the circumference. In addition, a tilted part 162 in one part of the insulating member 16 is faced with a central conductor 41 at a coaxial cable 40 which is attached to a series unit 100. Consequently, it is possible to eliminate a trouble that the central conductor 41 is erroneously conducted to the metal case 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a serial unit for relaying a high frequency signal or receiving as a terminal.

[0002]

2. Description of the Related Art Conventionally, in a high-frequency signal transmission system such as a CATV system, a series unit having a purpose of taking out a high-frequency signal at each customer end is known. The series unit is used by being attached to a storage case that is installed inside the wall surface of the consumer in the same manner as the method of installing an outlet for a power line.

[0003]

Because of the above-mentioned usage conditions, the series unit is standardized in dimensions such as the outer shape with respect to the housing case, and the circuit area of the printed circuit board disposed inside the series unit is standardized. The size of the car was naturally limited. Therefore, even if an attempt is made to improve the high frequency characteristics of a predetermined circuit such as taking out a high frequency signal, which is the original purpose of the series unit, the packaging density becomes too high, which makes the design difficult. Also, the center conductor of the coaxial cable connected to the printed circuit board, the wiring pattern of the printed circuit board, and the electric elements mounted thereon should be arranged adjacent to the metal case for shielding around them. The electrical insulation was uncertain.

The present invention has been made to solve the above problems, and an object of the present invention is to increase the circuit area of a printed circuit board in a series unit.
Further, at that time, it is necessary to ensure the insulation between the wiring pattern and the electric elements mounted on the wiring pattern and the surrounding metal case and to prevent the central conductor from being short-circuited when the coaxial cable is connected.

[0005]

The structure of the invention for solving the above-mentioned problems is designed in a serial unit to which a coaxial cable for transmitting a high-frequency signal is connected and which relays the high-frequency signal or receives as a terminal. A metal case formed in a box shape along an inner wall of the case, and a center conductor of the coaxial cable and a user arranged in the metal case to form a predetermined circuit by mounting predetermined electric elements and the like. A main board to which the center conductor of the consumer connector that outputs the high-frequency signal is connected, if necessary, a sub-board electrically connected in a direction substantially perpendicular to the main board, and the sub-board And an insulating member which is inserted into a gap between the inner wall of the metal case and a part of which faces the center conductor of the coaxial cable.

[0006]

The main board is arranged in a box-shaped metal case along the inner wall of the design case. Then, a predetermined circuit is formed by mounting a predetermined electric element or the like on the main board, and a center conductor of a coaxial cable and a center conductor of a consumer connector that outputs a high frequency signal to a consumer are used as necessary. Connected. In this way, the main circuit board and the predetermined circuit formed by the predetermined electric elements mounted on the main circuit board and the central conductor of the coaxial cable are connected in the metal case. This shield structure prevents high frequency signals from leaking to the outside. The sub-board is electrically connected to the main board in a direction substantially perpendicular to the main board, and the circuit area of the main board is increased as necessary. The insulating member is inserted into the gap between the sub-board and the inner wall of the metal case, and a part of the insulating member faces the central conductor of the coaxial cable. Even if a sub-board is added so as to increase the circuit area of the main board, the insulating member keeps the insulating property from the inner wall of the metal case. Also, when connecting the center conductor of the coaxial cable to the main board,
Since a part of the insulating member is opposed to the center conductor of the coaxial cable, the insulation property with respect to the metal case is maintained and it also serves as a stopper for the center conductor.

[0007]

EXAMPLES The present invention will be described below based on specific examples. FIG. 1 is a perspective view for explaining the shape and positional relationship of built-in parts of a series unit according to the present invention, and FIG. 2 is a perspective view showing the assembled state of the series unit according to the embodiment. 3 is a front view of the series unit of the same embodiment, and FIG. 4 is a rear view of the series unit of the same embodiment. The serial unit 100 is covered with a design case 11, which is a resin storage case, and a rectangular parallelepiped box-shaped metal case 12 is fitted therein. The metal case 12
By screwing the male screw portion 181 of the consumer connector 18 for outputting a high-frequency signal from the front side of the design case 11 to the female screw portion 123 of the design case 11,
The male screw portion of the consumer connector 181 and the metal case 12 are integrally fixed via the. As a result, in the consumer connector 18, the outer conductor of the ground is electrically connected to the metal case 12. A metal back cover 13 is inserted into the opening on the back side of the metal case 12. At this time, the cut-out portion 131 formed on the side surface portion of the back cover 13 is locked to the side surface hole end surface 111 of the design case 11, so that the back cover 13 seals the inside of the metal case 12 and is integrated with the design case 11. Fixed.

Further, on the upper surface and the lower surface of the metal case 12, sleeves 21 and 22 made of a cylindrical conductor that are electrically connected to the metal case 12 are provided upright. The metal case 1
A main board 14, which is a printed board for mounting a predetermined electric element and forming a predetermined circuit, is disposed inside the unit 2. In order to increase the circuit area of the main board 14, the sub-board 15 is provided in a direction substantially perpendicular to the main board 14.
Are soldered and electrically connected via a plurality of connection terminals. The main circuit board 14 and the sub circuit board 15 constitute a predetermined circuit for relaying or receiving a high frequency signal as a terminal. The main board 14 is a metal case 12.
The center conductor 182 of the consumer connector 18 is positioned inside the substrate and is soldered to the pattern on the predetermined circuit of the main board 14. The ground side terminal of the main board 14 is soldered to the inside of the metal case 12 to be electrically connected. An insulating member 16 made of resin is disposed between the main board 14 and the back cover 13.

Next, the operation of the present invention will be described with reference to FIGS. 5, 6 and 7. In FIG. 5, the coaxial cable 40 is attached to the series unit 100 of the present invention, and the back cover 13
FIG. 6 is an explanatory view showing a state in which the is removed, and FIG.
It is a longitudinal cross-sectional view along the line. FIG. 7 is an explanatory view showing a state in which the insulating member 16 is removed from FIG. A sub-board 15 is electrically connected to the main board 14 in a substantially vertical direction. Therefore, the branch / distribution transformer 151 (see FIG. 6), which is an electric element requiring a mounting area and volume, can be easily mounted on the sub-board 15. That is, it is possible to design a circuit, which has been difficult to design due to a small board area, by adding the board area of the sub-board 15 to the board area of the main board 14. Also, the main board 1
4 and the sub-board 15 are added, the mounting density can be reduced as the board area is increased, so that the reliability of the circuit can be improved.

Then, the insulating member 16 is inserted with the back cover 13 removed, and when the insulating member 16 is arranged at a predetermined position, the insertion portion 161 thereof has a sub-board 1 as shown in FIG.
5 and the inner side surface of the metal case 12 will be located. As a result, even if the sub-board 15 is inclined and soldered with respect to the main board 14, the circuit formation surface of the sub-board 15 is reliably insulated from the metal case 12. Sleeve 2 erected in metal case 12 of series unit 100
A central conductor 41 of the coaxial cable 40 is provided in each of 1 and 22.
Is inserted. Then, the pair of ohmic bands 31 and 32 arranged in the design case 11 are connected to two screws 3 respectively.
The outer skin portion 42 of the coaxial cable 40 is fixed to the sleeves 21 and 22 by screwing with the screw 3. Then, the outer conductor 43 of the coaxial cable 40 causes the sleeve 21,
Electrically connected to 22. The insulating member 16 has an inclined portion 162 in a part thereof, and the inclined portion 162 faces the center conductor 41 of the coaxial cable 40 inserted in the series unit 100 and electrically connected in a state where the inclined member 162 is arranged at a predetermined position. Will be located. This allows the coaxial cable 4
Even if the central conductor 41 part of 0 is exposed for a long time,
The center conductor 41 is reliably insulated from the metal case 12 because the inclined portion 162 is interposed between the metal case 12 and the metal case 12. Then, the length of the central conductor that is longer than necessary is placed on the inclined portion 162, so that it is possible to easily perform a treatment such as bending the tip end sideways.

[0011]

According to the present invention, since the sub-board is electrically connected and added in a direction substantially perpendicular to the main board, the overall circuit area and the mounting volume of components are increased, and the standardized series connection is achieved. The predetermined circuit design and layout in the unit can be facilitated. Further, in the present invention, since the insulating member is provided so as to be inserted into the gap between the sub-board and the inner wall of the metal case,
The sub-board is surely insulated from the metal case around it. Further, since a part of the insulating member faces the center conductor of the coaxial cable attached to the series unit, it is possible to eliminate the inconvenience that the center conductor of the coaxial cable is erroneously conducted to the metal case.

[Brief description of drawings]

FIG. 1 is a perspective view illustrating a shape and a positional relationship of built-in parts of a series unit according to a specific embodiment of the present invention.

FIG. 2 is a perspective view showing a completed assembled state of the series unit according to the embodiment.

FIG. 3 is a front view showing a series unit according to the embodiment.

FIG. 4 is a rear view showing the series unit according to the embodiment.

FIG. 5 is an explanatory view showing a state in which the back cover of the series unit according to the embodiment is removed and the coaxial cable is connected to the main board.

6 is a cross-sectional view taken along the line AA of FIG.

FIG. 7 is an explanatory view showing a state in which an insulating resin member is removed from FIG.

[Explanation of symbols]

11-Design case 12-Metal case 13-Back cover 14-Main board 15-Sub board 16-Insulating member 18-Consumer connector 21,22-Sleeve 31,32-Ohm type band 40-Coaxial cable 41- (Coaxial Center conductor of cable 100-series unit

Claims (1)

[Claims] 1. In a series unit to which a coaxial cable for transmitting a high frequency signal is connected and which relays the high frequency signal or receives as a terminal, a metal case formed in a box shape along an inner wall of a design case, The center conductor of the coaxial cable and the center conductor of the consumer connector that outputs the high-frequency signal to the consumer are disposed in the metal case, form a predetermined circuit by mounting a predetermined electric element, and the like. A main board that is connected as necessary, a sub-board that is electrically connected in a direction substantially perpendicular to the main board, and a part of the sub-board that is inserted into the gap between the sub-board and the inner wall of the metal case. And an insulating member formed so as to face the center conductor of the coaxial cable.