JPH0617263Y2 - Complex circuit device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite circuit device, and more particularly to a composite circuit device having two circuit devices in the same case and having a plurality of input / output terminals.

2. Description of the Related Art Generally, a video tape recorder (hereinafter referred to as VTR) is provided with a composite circuit device (RF unit) that modulates an image signal or the like in the VTR to an antenna input terminal.
The RF unit is composed of a booster and a modulator, and its concrete circuit structure is shown in FIG.

In the figure, the booster unit 1 distributes a signal input from an antenna input terminal 2 through a high-pass filter 3, a band-pass filter 4 and an amplifier 5, and then distributes it by a distributor 6, and one of its outputs is further amplified by an amplifier 7 , A signal is output from the television output terminal 10 to the television tuner through the mixing circuit 8 and the high-pass filter 9 so that normal video and audio can be displayed on the television. The other output of the distributor 6 is supplied from the VTR output terminal 12 to the VTR via the amplifier 11.
It is supplied to the tuner, and the video and audio signals are recorded on the video tape by the magnetic head.

The modulator unit 13 outputs a reproduction video signal from the tape and the magnetic head at the video input terminal 14 when reproducing the video and audio.
In addition, the reproduced voice signal is input to the voice input terminal 15. The video signal is supplied to the mixing circuit 22 via the clamp and amplification circuit 21, and the audio signal is also supplied to the mixing circuit 22 via the amplifier 23 and the FM circuit 24 to be mixed with the video signal. The output of the mixing circuit 22 is balanced-amplitude-modulated in the balanced-amplitude modulation circuit 25 by a reference signal from the oscillation circuit 26 (the frequency of this signal can be changed by a trimmer capacitor 40 described later), and further the amplifier 27.
Is supplied to the mixing circuit 8 of the booster 1 through the modulator output terminal 28 and the modulator output terminal 29.
Thereafter, in the same manner as in the above case, video and audio are reproduced on the television.

Problems to be Solved by the Invention As described above, the RF unit is roughly the booster unit 1
However, conventionally, the booster unit 1 and the modulator unit 13 are arranged in separate cases to form two circuit devices. Therefore, two cases are required, the number of parts is increased, and a large arrangement space is required, resulting in an increase in size of the VTR. In addition, the booster unit 1 and the modulator unit 13
Is connected by a connecting wire (lead wire), but there is a problem in that disturbance enters from this lead wire and noise is generated on the screen of the television.

Further, although a plurality of terminals 2, 10 and 12 are arranged in the booster section 1, conventionally, no particular consideration has been given to the arrangement positions of these terminals 2, 10 and 12, and the mountability to the VTR, etc. It was simply arranged closer to the surface. For this reason,
There is a problem that the isolation (insulation property) is not sufficiently maintained and interference occurs between the terminals, which also causes noise on the screen of the television.

The present invention has been made in view of the above points, and an object of the present invention is to provide a composite circuit device in which isolation is improved and the device is made compact.

The present invention is a composite circuit device in which a modulator section and a booster section are integrally housed in the same case, wherein the booster section has an antenna input terminal and a television output terminal. The antenna input terminal is provided on a top surface of the case, the top surface corresponding to the booster portion being spaced apart from each other, and the video output terminal of the booster portion is a side surface corresponding to the booster portion of the case and adjacent to the top surface. And at a position where the distance from the television output terminal is substantially equal to each other, the power source of the modulator section and the booster section, the ground terminal and the input terminal for inputting a signal to the modulator section, among the cases described above. It is arranged on one side corresponding to the modulator section.

Function The antenna input terminal and the television output terminal are arranged on the same surface corresponding to the booster part, so it can be directly attached to the video device, etc., and it is separated from the antenna input terminal and the television output terminal. Since the video output terminals are provided at the positions, it is easy to achieve isolation between the terminals. Further, the modulator section, the power source of the booster section, the ground terminal, and the input terminal of the modulator section are provided on one side face corresponding to the modulator section to facilitate the connection and to isolate the other terminals.

Embodiment FIG. 1 is an overall perspective view of an RF unit to which an embodiment of a composite circuit device according to the present invention is applied, and FIGS. 2A and 2B are a plan view and a longitudinal sectional view of the RF unit, respectively. 4, those parts which are the same as those corresponding parts in FIG. 4 are designated by the same reference numerals, and a description thereof will be omitted. In FIG. 1, an RF unit 32 has a booster section 1'and a modulator section 13 'as an integral structure.
The booster unit 1 ′ includes a booster circuit board 33 covered with a booster case portion 34 a of a case 34, and the modulator unit 13 ′ includes a modulator circuit board 35 and a case 3.
4 modulator case part 34b.

The case 34 is formed by punching out a single metal plate as shown in FIG. 3, and the case upper surface portion 34c and the shield plate body 34d.
The case side plate portions 34e, 34f, 34g, 34h are arranged on the four circumferences of (a pair of shield plate portions 34d-1, 34d-2 are integrally connected by a continuous plate portion 34d-3).
Particularly, the case side plate portions 34e, 34f, 34g are integrally connected by a U-shaped connecting plate portion 34i, which are appropriately bent along the dotted line in the figure to form the box shape of FIG. is there. The case upper surface 34c has an opening 34j and holes 34k and 34l, and the shield plate 34d-1 has a height higher than that of the shield plate 34d-2, and the holes 34m-1 and 34m- are respectively formed. 2,34m-3,34
m-4 and lower end recesses 34n-1 and 34n-2, and the side plate portions 34e to 34h respectively project laterally extending protrusions 34p and engaging protrusions 34q outwardly in the vertical position. The side plate portions 34e, 34g, and 34h have inward cut-and-raised portions 34r at appropriate height positions.
e and 34g respectively have lower end bent portions 34s and other side plate portions 3
4f and 34h are a pair of mounting plate portions 34t (holes 34t-
1)), and appropriately has a lower end recess 34u and a hole 34v. Further, notches 34w are provided at adjacent corners of the side plate portions 34e to 34h so as to facilitate die cutting and bending of the side plate portions 34e to 34h.

Here, the case upper surface portion 34c, the shield plate portion 34d-
1, the side plate portion 34h, and the third side plate portion 34e, 34g
The above-mentioned booster case portion 34a is constituted by each right half portion in the figure, and each left half portion in FIG. 3 of the connecting plate portion 34i, the side plate portion 34f, the shield plate portion 34d-2, and both side plate portions 34e, 34g. The modulator case portion 34b
Is configured.

In the above structure, the shield plate portion 34d has a U-shaped cross section with a U-shaped opening facing downward, and the shield plate portion 34d-
1, 34d-2 has a double shield plate structure, and strongly prevents unnecessary signal coupling between the booster and the modulator. The shield plate body may be integrally bent from the outside of the side plate portion 34e or 34g to form a double shield plate structure having a substantially U-shaped cross section with the U-shaped opening facing upward.

Further, in FIG. 1, particularly, the respective mounting plate portions 3 of the side plate portions 34f and 34h.
2) It was stamped and deformed from the inside of the case at the fold line with 4t
Individual rib portions 34t-2 are formed. Therefore, RF
At the time of mounting the unit 32 alone, or at the time of attaching each mounting plate portion 34t of the RF unit 32 to a video tape recorder set substrate (not shown) and tightening the screws by using the holes 34t-1, the mounting plate portion is mounted. 34t is rib 34
Due to the reinforcing function of t-2, the squareness with respect to the side plate portions 34f and 34h is stable and stable, and the configuration is extremely stable and the assembling work is easy.

The booster circuit board 33 is provided with the circuit parts 37 constituting the circuits 3 to 9 and 11 of FIG. 4 on the upper surface of the board 36, and inside the booster case part 34a, the inward cut-and-raised parts 34r are formed from below the case. And the ground splint on the lower surface of the substrate 36 is appropriately soldered to the shield plate portion 34d-1 and the side plate portions 34e, 34g, 34h to be fixed to the concave portion 34n-1. Further, the cylindrical antenna input terminal 2 and the television output terminal 10 are respectively provided in the holes 3 of the case upper surface portion 34c.
4k and 34l, and the leg portions 2a and 10a thereof are respectively inserted into the board 36 and soldered. Similarly, the side plate 3
The VTR output terminal 12 is attached to the hole 34v of 4h and connected to the substrate 36. Thus, the booster section 1'is completed.

Next, the modulator circuit board 35 is provided with the circuit components 39 including the circuits 21 to 27 of FIG. 4 on the upper surface of the board 38, and is provided on the left and right sides of the board 38 in FIG. 2B in the modulator case portion 34b. The protruding plate portion is appropriately shield plate portion 34d
-2 concave portion 34n-2 and the side plate portion 34f are fitted into the concave portion 34u until they come into contact with each other, and the ground print on the lower surface of the substrate 38 is shielded by the shield plate portion 34d-2 and the side plate portions 34e, 34f, 3.
The modulator portion 13 'is completed by soldering and fixing to 4g. At this time, the modulator-side substrate 38 is fixed to a position lower than the booster-side substrate 36 by the step size as shown in FIG. The reason for providing this step is that the height of the mounting base of the antenna input terminal 2 and the television output terminal 10 with respect to the upper surface 34c of the case and the height of the trimmer capacitor 40 on the upper surface of the oscillator circuit 26 that is the highest in the modulator circuit component 39. The level (this height level is eventually regulated to be the same as the height level of the connecting plate portion 34i) is substantially the same height level, as will be described later, and the booster portion 1 '
And the upper surface of the modulator portion 13 'is simply a cover 4
4 so that the antenna input terminal 2 and the leg portions 2a, 10a of the television output terminal 10 are limited in length to prevent the influence of other signals. It gives rise to dimensions.

Further, the projecting plate portion projecting from the side plate portion 34f of the modulator side substrate 38 constitutes a terminal plate portion 38a, and a pair of terminal molds 41 and 42 are fixed to the upper surface thereof as shown in FIG. The terminal mold 41 is for a booster, the terminals 41a to 41c in FIG. 2 (A) are for booster power source, arm, and empty terminal, respectively, and the terminal mold 42 is for modulator.
The terminals 42a to 42f are respectively for grounding in FIG.
For modulator power supply, for playback audio signal input, for ground,
It is for inputting playback video signals and for grounding.

Further, the punching holes 34 of the shield plate portions 34d-1 and 34d-2 are provided.
m-1, 34m-3 (concentric with each other), 34m-2, 34
m-4 (concentric to each other), feedthrough capacitors 43a, 4
3b are respectively fitted and fixed. The feedthrough capacitor 43a is a power source for the booster section 1'which communicates with the terminal 41b, and the feedthrough capacitor 43b has both ends thereof printed with a modulator output terminal and a modulator input terminal printed on the modulator side and booster side substrates 38 and 36, respectively (see FIG. 4). (Corresponding to reference numerals 28 and 29). The feedthrough capacitors 43a and 43b can prevent the oscillation signal of the oscillation circuit 26 from being coupled to the booster portion 1'side in cooperation with the double shield plate portions 34d-1 and 34d-2. Further, since both the terminal prints 28 and 29 for connecting the modulator and the booster are arranged on the substrates 38 and 36 at positions facing each other, the feedthrough capacitor 43 is provided.
The length of the connecting line via a and 43b is also small, and the construction is simple and the assembling work is easy. The feedthrough capacitors 43a and 43b are the shield plate 34d in FIG. 2 (B).
The shield plate 3 is provided above the substrate 36 of
It may be provided in a portion between the 4d substrates 36 and 38.

Reference numeral 44 denotes an upper cover, which has three holes 44a, 44 in FIG.
b, 44c, and a plurality of tongue pieces 44d bent downward on four sides, and in particular, the four tongue pieces 44d have coupling holes 44e. The cover 44 has holes 4 on the upper surface of the case 34.
4a and 44b are loosely fitted to the antenna input terminal 2 and the television output terminal 10, respectively, and the tongue piece 44d on the 4 side is fitted to the outside of the side plate portions 34e to 34h, respectively, and the upper protrusion 34p is formed.
It is mounted by being elastically mounted on. At this time, the lower surface of the cover 44 is the case upper surface portion 34c of the booster portion 1 ', the shield plate connecting plate portion 34d-3, and the modulator portion 13'.
Of the tongue pieces 4i which come into common contact with the connecting plate portion 34i of
The 4d engagement holes 44e are elastically engaged with the upper engagement protrusions 34q of the side plate portions 34e to 34h to be firmly locked.
The hole 44c of the cover 44 faces the rotor shaft 40a of the trimmer condenser 40, and the rotor shaft 40a is rotationally adjusted by a driver (not shown) through the hole 44c to oscillate the circuit 2.
Although the oscillating frequency of 6 can be adjusted, as described above, since the trimmer capacitor 40 is at the same height level as the connecting plate portion 34i, the rotor shaft 40a is close to the hole 44c, so that the adjusting operation is easy.

A lower cover 45 has a plurality of tongue pieces 45a (having appropriate engaging holes 45b) bent upward on both sides, and bent plate portions 45c, 45d on the other sides. Cover 4
5 is a tongue piece 45a and a bent plate portion 45 with respect to the lower surface of the case 34.
c and 45d are fitted to the outsides of the side plate portions 34e to 34h, respectively, and are elastically mounted on the lower protrusions 34p to be attached, and the respective engagement holes 45b are elastically engaged with the lower engagement protrusions 34q. Be stopped. Thus, the RF unit 32 is completed.

According to the RF unit 32, the booster section 1'in the case section 34a and the modulator section 1 in the case section 34b.
Since 3'constitutes a case 34 in which both case portions 34a and 34b are formed by bending a single metal plate, they are arranged side by side integrally and compactly, and the overall configuration is simplified and the number of manufacturing and assembling steps is reduced. You can. The reason why the case 34 can be bent from a single plate is that a connecting plate portion 34i that mainly connects the side plate portions 34e to 34g is provided and the side plate portions 34e and 34g on both sides are formed.
The connecting plate portion 34i also functions as a reinforcing rib, and is abutted on the upper cover 44 as described above to ensure a good ground potential for each other. Further, the connecting plate portion 34i is not particularly limited to the U-shape, and when the modulator case is used alone, side plate portions may be provided on the four sides of the square-shaped connecting plate portion, and the connecting plate portion 34i may be integrally bent. Further, when the other case portion 34a is integrally provided on one side as in the present application, it may be formed in the above-mentioned U-shape, but these are integrally formed with the side plate portions in advance in the respective directions with respect to each piece of the connecting plate portion. Since it can be set, various shapes can be easily obtained from a single plate, and its application range is extremely wide.

Next, a configuration in which the booster and the modulator are attached to a video tape recorder set will be described by comparing a conventional example and the present application. FIG. 5 shows a conventional separate booster 1 and modulator 13 as a video tape recorder set 51.
It is a configuration attached to. The booster 1 is fixed to the inner surface of the rear plate of the set 51, and the antenna input terminal 2 and the television output terminal 10 project rearward. Modulator 1
3 is fixed on the substrate in the set 51, properly connected to the booster 1, and further connected to the VTR tuner 52 in the set 51. According to this, in order to readjust the trimmer capacitor 40, the upper panel of the set 51 had to be disassembled, which was difficult.

However, according to the RF unit 32 in which the booster portion and the modulator portion are integrated as in the present application, when the terminals 51 are fixed to the inner surface of the rear side plate of the set 51 as shown in FIG. The trimmer capacitor 40 can be easily readjusted through the holes in the side plates, which is extremely convenient.

Thus, the antenna input terminal and the television output terminal are provided separately from each other on the upper surface corresponding to the booster portion, so that the main body can be directly attached to the video device with isolation. The video output terminal is arranged on one side surface adjacent to the upper surface of the booster section at a position where the distances from the antenna input terminal and the television output terminal are substantially equal. And the input terminal of the modulator section is disposed on one side surface corresponding to the modulator section, and the antenna input terminal, the television output terminal, the video output terminal, and the other terminals are provided separately from each other. The isolation can be improved.

Effect of the Invention As described above, according to the present invention, the antenna input terminal and the television output terminal are provided separately from each other on the upper surface corresponding to the booster section, so that the main body is directly attached to the video main body while maintaining isolation. Further, the video output terminal is disposed on one side surface adjacent to the upper surface of the booster section at a position where the distance from the antenna input terminal and the television output terminal is substantially equal, and further, the power supply for the modulator section and the booster section, Since the ground terminal and the input terminal of the modulator section are arranged on one side corresponding to the modulator section, the antenna input terminal, the television output terminal, the video output terminal and other terminals may be provided separately from each other. It is possible to improve the isolation between terminals, and it becomes an external terminal for VTRs. By arranging the tenor input terminal and the television output terminal on the same surface, it has features such as easy attachment to a VTR set.

[Brief description of drawings]

FIG. 1 is an overall perspective view of an RF unit to which an embodiment of a composite circuit device according to the present invention is applied, and FIGS. 2A and 2B are a plan view and a longitudinal sectional view of the RF unit, respectively. FIG. 4 is a development view of the case of the RF unit, FIG. 4 is a block diagram showing a circuit configuration of a general booster and modulator, and FIGS. 5 and 6 are conventional and present invention booster and modulator video tape recorders. It is a perspective view showing the state where it was attached to a set. 1, 1 '... Booster part, 2 ... Antenna input terminal, 1
0 ... Television output terminal, 12 ... VTR output terminal, 13, 13 '... Modulator section, 14 ... Video input terminal, 15 ... Audio input terminal, 26 ... Oscillation circuit, 2
8 ... Modulator output terminal, 29 ... Modulator input terminal, 32 ... RF unit, 33 ... Booster circuit board, 34 ... Case, 34a, 34b ... Case section,
34d ... shield plate, 34d-1, 34d-2 ...
Shield plate portion, 34e to 34h ... Side plate portion, 34d-
3, 34i ... Connecting plate part, 34t ... Mounting plate part, 34t
-2 ... Rib part, 35 ... Modulator circuit board, 3
6, 38 ... Board, 37, 39 ... Circuit parts, 40 ...
Trimmer capacitors, 41, 42 ... Terminal mold, 43
a, 43b ... Feedthrough capacitor, 44, 45 ... Cover, 51 ... Video tape recorder set.

Claims (1)

[Scope of utility model registration request] 1. A composite circuit device in which a modulator section and a booster section are integrally housed in the same case, wherein an antenna input terminal and a television output terminal of the booster section are included in the booster of the case. Provided apart from each other on the upper surface corresponding to the section, the video output terminal of the booster section corresponding to the booster section of the case, and on the side surface adjacent to the upper surface,
The antenna input terminal and the television output terminal are arranged at positions where the distances from the television output terminal are substantially equal to each other, and the power source of the modulator section and the booster section, an earth terminal, and an input terminal for inputting a signal to the modulator section are provided. A composite circuit device, which is arranged on one side of the case corresponding to the modulator section.