JPS6340483A - Adapter with separate transformer checking direct current - Google Patents

Abstract

PURPOSE:To improve the insertion loss characteristic, the reflection characteristic and the dielectric strength of a signal by mounting a separate transformer on a printed board on both surfaces of which a conductor pattern is formed. CONSTITUTION:The first conductor pattern 22 and the second conductor pattern 23 consisting of a conductor are separately wired on the surface 21 of the separate transformer mounting printed board P board 20. On the first conductor pattern 22 and the second conductor pattern 23 respectively, the first through holes 24, 25 passing to a rear surface are formed and on the part of an insulator of the surface 21 on which the respective conductor patterns 22, 23 are not formed, the second through holes 27, 28 are formed. The lead wires 9, 10 of the separate transformer 4 are inserted into the second through holes 27, 28, protruded to the rear surface 31 of the printed board 20 and lead wires 11, 12 are connected to the conductor patterns 22, 23. On the rear surface 31 of the P board 20, the third conductor pattern 32 and the fourth conductor pattern 33 are respectively separated and wired.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an adapter with a direct current blocking separation transformer that is useful when connecting a television receiver and a video tape recorder (hereinafter referred to as VTR). It is something.

BACKGROUND OF THE INVENTION A conventional direct current blocking isolation transformer and an adapter incorporating a direct current blocking isolation transformer will be described below with reference to the drawings.

FIG. 4 is a circuit diagram showing a conventional DC blocking isolation transformer. In the figure, 14 is a DC blocking isolation transformer (hereinafter referred to as 1 isolation transformer) formed by a first coil 4a and a second coil 4b. There is.

FIG. 6 is an exploded side view showing the separation transformer shown in FIG. 4 attached to a coaxial cable. 1 is VT
Coaxial cable for connecting to the R side.

2 is the GND of the coaxial cable 1, 3 is the signal line of the coaxial cable 1, 4 is the front transformer, 6 is the GND part of the terminal to be connected to the television side, 6 is the GND part of the terminal to be connected to the television side. A signal line, 7 is an upper lid that houses the separation transformer 4, and 8 is a bottom plate on which the GND section 6 and the signal line 6 are installed. The lead wire 9 of the first coil 4a forming the separation transformer 4 is connected to the signal line 3, and the lead wire 10 is connected to GND2. The lead wire 11 of the second coil 4b is connected to the signal line 6, and the lead wire 12 is connected to (, ND5).

Signals sent from the VTR are separated by 1° via coaxial cable)
The received signal is received by the television receiver via the transmission unit 4.

Problems that the invention attempts to solve However, in the adapter with a separate lance and lance as described above, the insertion loss characteristic 1 reflection characteristic of the signal sent from the VTR to the television receiver is poor, and the split transformer 4 is connected to the bottom plate 8. Since the lead wires 9, 10, 11, and 12 are placed in an unstable state, the lead wires 9, 10, 11, and 12 may come close to each other, resulting in a problem that the dielectric strength is insufficiently high.

In view of the above problems, the present invention improves insertion loss characteristics and reflection characteristics by connecting a separation transformer to a printed circuit board with conductor patterns formed on both sides, and
This improves dielectric strength.

Means for Solving the Problems In order to solve the above problems, the DC blocking adapter of the present invention has a printed circuit board with conductor patterns formed on both sides of an insulator, and one of the printed circuit boards. an external connection terminal electrically connected on the other surface of the printed circuit board, a coaxial cable electrically connected on the other surface of the printed circuit board, and a direct current blocking sub-wall 11 transformer having two coils. , one coil of the DC blocking isolation transformer is electrically connected to one surface of the printed circuit board, and the other coil is electrically connected to the other surface of the printed circuit board. .

Function: The present invention has the above-described structure, and by mounting a DC isolation transformer on a printed circuit board, the structural performance is stabilized.1. The signal insertion loss characteristic 1 reflection characteristic can be improved, and the lead wire of the 1 isolation transformer can be positioned by the printed circuit board, so that the dielectric strength can be improved.

6. Example Hereinafter, a direct current blocking separation transformer adapter according to an example of the present invention will be explained with reference to FIGS. 1, 2, and 3.

FIGS. 1 and 2 are a two-side view and a rear view of a printed circuit board on which a direct current blocking isolation transformer is mounted.

In FIG. 1, 21 is the surface of a printed circuit board (hereinafter abbreviated as P board) 2o on which the separation transformer 4 is mounted. On the surface 21, a first conductor pattern 22 and a second conductor pattern 23 made of conductors are separated and wired. First through holes 24 and 25 communicating with the back surface are formed above the first conductor pattern 22 and the second conductor pattern 23, respectively. Further, second through holes 27 and 28 are formed in the portions of the insulator on the surface 21 where the respective conductor patterns 22 and 23 are not formed. The lead wire 9°1o of the separation transformer 4 is inserted into the second through hole 27,28 and protrudes to the back surface 31 of the printed circuit board 20. Lead wire 1 of separation transformer 4
1.12 is connected to the first conductor pattern 22.23.

In FIG. 2, 131 is the back side of the P board 20, where the third conductor pattern 32 and the fourth conductor pattern 33 are separated and wired, and the first through holes 24 and 25 are the insulator parts. The second through holes 27 and 28 are connected to the third through holes 27 and 28, respectively.
The lead wires 9 and 10 of the transformer 4 are inserted into the second through holes 27 and 28, and are connected to the third conductor pattern 32 and the fourth conductor pattern 33, respectively. It is connected to the conductor pattern 33. A core wire 41 and a ground wire 42 of a coaxial cable are connected to the third conductor turn 32 and the fourth conductor turn 33, respectively.

Next, using FIG. 3, the state in which the 5-minute transformer is connected to the coaxial cable and the external connection terminal will be explained.

140 in the figure is a coaxial cable provided with a core wire 41 and a ground wire 42. The coaxial cable 40 is connected to the lance 4 via the third conductor track 32 and the fourth conductor track 33, as is clear from the foregoing description. A signal line 6 forming an external connection terminal (the ND portion 6 is inserted into the first through hole 24 and 26, and is connected to the first conductor pattern 22 and the second conductor pattern 23, respectively) and are connected to the separation transformer 4 via lead wires 11 and 12, respectively.In this state, the case 7 is joined to the bottom plate 8 in the B direction via the P plate 20, and covers the separation transformer 4 and the like.

The adapter with separation transformer configured as described above is connected to both sides 21.31 through an insulator made of paper epoxy resin, etc.
By using a P plate 2° on which a conductor is formed,
The first conductor pattern 22 and the third conductor pattern 32, and the second conductor pattern 23 and the fourth conductor pattern 33 are each connected with a stray capacitance of several picos, and the high frequency transmission rate is This improves insertion loss characteristics and reflection characteristics. Furthermore, the core wire 41 and the ground wire 42 of the coaxial cable 4o. And the GND section 6 and the signal line 6 are connected to the P plate 2o.
The conductor patterns 722, 23, and the 32° wires do not come close to each other, and the insulation is not polished insufficiently.

Effects of the Invention As described above, according to the present invention, by mounting the minute SL lance on a printed circuit board with conductor patterns formed on both sides, the insertion loss characteristic of one signal due to the stray capacitance due to the conductor pattern 9 Reflection characteristics In addition, the lead wires can be positioned by the printed circuit board, and the dielectric strength can be improved.

[Brief explanation of the drawing]

Fig. 1 is a top view showing the main parts of the adapter with separation transformer for DC blocking according to the embodiment of the present invention, Fig. 2 is a rear view showing the main parts, and Fig. 3 shows the adapter with separation transformer for DC blocking. FIG. 4 is a circuit diagram showing a direct current blocking isolation transformer, and FIG. 6 is an exploded side view showing a conventional adapter with a direct current blocking isolation transformer. 9t\-ji23.32.33... Conductor pattern, 26...
...Insulator, 40...Coaxial cable. Name of agent: Patent attorney Toshio Nakao and one other person, 23, 23--I'm back! Then turn 2nd figure 5, 6 - Puma 胛袢 KI Condolences 4 - ~ Naonno (, Pli: Yorei High "), Lance 2C - Difference Color Shi 1
Figure 4 Figure 5

Claims (1)

[Claims] A printed circuit board having a conductive pattern formed on both sides of an insulator, an external connection terminal electrically connected on one surface of the printed circuit board, and an electrically connected terminal on the other surface of the printed circuit board. a coaxial cable, and a direct current blocking isolation transformer having two coils, one coil of the direct current blocking isolation transformer being electrically connected to one surface of the printed circuit board, and the other coil being electrically connected to one surface of the printed circuit board. An adapter with a direct current blocking separation transformer, characterized in that the adapter is electrically connected to the other surface of the printed circuit board.