JPH066689A - Rf modulator - Google Patents

Abstract

PURPOSE:To transmit a modulation output with radio by providing a card type case, a circuit board put in the case, and a connector which is electrically connected to the circuit board and arranged along one side of the case. CONSTITUTION:The RF modulator 1 is equipped with not only a modulating circuit, but also a circuit for amplifying the modulation output, so the modulated signal can be transmitted in the air. Further, the circuit board equipped with the modulating circuit and amplifying circuit is put in the card type case 2 and can input and output signals through the connector 8. A card type RF modulator 1 can be mounted on the main body of video or information equipment. For example, a slot is provided and a connector which is paired with the connector 8 provided to the RF modulator 1 is only provided in relation with the slot.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an RF modulator, and more particularly to improvement of the form of the RF modulator.

[0002]

2. Description of the Related Art When a photographed image recorded by a video device such as a video camera is to be reproduced on a separate monitor device or is to be displayed in real time, it is usually operated with an RF modulator interposed. , Video equipment and monitor equipment are connected. Also,
The same is done, for example, between a video camera and a video tape recorder. If the monitor device, the video tape recorder, or the like has an A / V terminal, the RF modulator becomes unnecessary.

Because of this, A / V cables, R
The F modulator and the like are prepared as accessories for video equipment.

[0004]

However, in the above-mentioned use state, the video equipment and the monitor equipment or the video tape recorder must be wired with a cord regardless of whether the RF modulator is interposed or not. Therefore, there are the following drawbacks.

That is, since the code length is limited,
It is impossible to perform reproduction or the like in a place a little far away or in an adjacent room. Further, the movable range of the video camera is limited by the code length. Also, the reception is limited to a single monitor device or a video tape recorder.

[0006] As described above, in the above-mentioned usage state, the wiring is required, so that the degree of freedom of the usage method is limited, which causes the use of the video equipment and the like not to be widely spread.

[0007] For example, if an RF modulator having a wireless transmission function is built in a video device such as a video camera, the above-mentioned wiring is unnecessary. However, if an RF modulator is incorporated in a video device such as a video camera, such an RF modulator is not always necessary, and thus the portability of the video camera is deteriorated, which is not preferable.

Therefore, the object of the present invention is to have a form suitable for mounting on a desired device as needed.
The goal is to provide an F modulator.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned technical problems, the present invention provides a card type RF modulator.

That is, the RF modulator includes a card type case, a circuit board housed in the case, and a connector electrically connected to the circuit board and arranged along one side of the case. . The circuit board includes a modulation circuit and a circuit for amplifying the modulation output.

[0011]

According to such an RF modulator, not only the modulation circuit but also the circuit for amplifying the modulation output is provided, so that the modulation signal can be transmitted in the air. A circuit board including such a modulation circuit and an amplification circuit is housed in a card-type case, and signals can be input and output through the connector.

[0012]

As described above, according to the RF modulator of the present invention, the modulated output can be wirelessly transmitted, so that it is difficult to connect the cables or at least one of the devices to be connected is moved. Even if it is required to be delivered to the plurality of receiving devices at the same time by the body, it is possible to perform the transmission without any trouble. Therefore, the applications of the video equipment or the information equipment can be expanded, and as a result, the commercial value of these equipment can be increased.

The RF modulator according to the present invention is in the form of a card as a whole, such as an IC memory card. Therefore, it is easy to store and carry, and is suitable for handling as an optional accessory for various video equipment or information equipment. As a result, if such an RF modulator is used, it is not necessary to equip the main body of these devices with a function that is not always used, such as a function as an RF modulator in a video device or an information device. It is possible to prevent the size and weight of such equipment from increasing.

In order to mount the RF modulator according to the present invention on a video equipment or an information equipment, the main body of such equipment is provided with, for example, a slot in which a card type RF modulator can be mounted. It suffices to provide a connector paired with the connector provided in the RF modulator in association with this slot. If such a slot can be shared with other function cards, a special space only for the RF modulator is not required, and a plurality of optional functions can be combined into one device by switching with a switch, for example. Easy to give to. Also, R
When the F modulator is mounted in the slot as described above, the F modulator can be stored in the main body of the video equipment or the information equipment. Therefore, the RF modulator interferes with the use of the video equipment or the information equipment. Never be.

Further, according to the RF modulator of the present invention, the modulated signal can be transmitted only by connecting it to the paired connector via the connector. That is, it is possible to quickly bring the device into a usable state without the trouble of wiring.

[0016]

1 is a perspective view showing the appearance of an RF modulator 1 according to an embodiment of the present invention. FIG. 2 is an enlarged sectional view taken along line II-II in FIG. Figure 3 shows R
3 is a block diagram showing an electric circuit provided in the F modulator 1. FIG.

The RF modulator 1 comprises a card type case 2. The case 2 includes a frame 3, an upper cover 4 that closes an upper surface opening of the frame 3, and a lower cover 5 that closes a lower surface opening of the frame 3. Case 2 like this
Are preferably sized substantially the same as a general-purpose IC memory card.

The frame 3 is composed of a molded product made of a synthetic resin having an increased rigidity, such as glass fiber reinforced polyphenylene sulfide, polyethylene terephthalate, polycarbonate and polyamide. Such a frame 3 may be subjected to metal plating, conductive coating, or the like at a necessary portion for the purpose of improving the shield property. The frame 3 may be made of a material such as an aluminum alloy or a zinc alloy other than the above-mentioned synthetic resin.

The upper cover 4 and the lower cover 5 are made of a conductive material such as a metal plate in order to exhibit a shielding property. The outer surfaces of the upper cover 4 and the lower cover 5 can be appropriately used as surfaces for printing or the like.

A circuit board is housed in the case 2. The circuit board comprises a printed circuit board 6 in this example. On the printed circuit board 6, for example,
A double-sided wiring type of glass epoxy substrate having a thickness of 0.5 mm is used. Required electronic components 7 and connectors 8 are surface-mounted on the upper surface of the printed circuit board 6. The lower surface of the printed circuit board 6 is provided with required wiring and ground wiring which are electrically connected to the wiring on the upper surface through the through holes. Although not shown, the lower surface of the printed circuit board 6 is covered with an insulating film except for the ground connection portion.

The printed circuit board 6 may be made of, for example, a ceramic material, may have a multi-layered structure, or may be of a single-sided wiring type. If the ground pattern can be formed on most of the lower surface of the printed circuit board 6, the lower cover 5 described above can be omitted. However, it is preferable that the lower cover 5 is provided for the sake of appearance and rigidity.

As described above, the connector 8 surface-mounted on the printed circuit board 6 is, for example, a socket type, and is arranged along the short side of the case 2, for example.

The printed circuit board 6 on which the required electronic components 7 and the connector 8 are mounted is positioned in the case 2 mainly by the frame 3. The upper cover 4 and the lower cover 5 are fixed to the frame 3 by, for example, screwing, adhesion, welding or the like.

Further, along the long side of the case 2, for example,
A transmitting antenna 9 is arranged. The transmitting antenna 9 is
For example, it is a retractable rod antenna mode, and if necessary, it can be pulled out and its length can be lengthened as indicated by arrow 10. The transmitting antenna 9 is the case 2
It can be placed using the little space inside. The case 2 is provided with a notch 11 in order to easily pull out the transmitting antenna 9. Further, the notch 11 allows the transmitting antenna 9 to be housed without protruding from the outer shape of the case 2. Of course, the notch 11 of the case 2 is not necessary when the tip of the transmitting antenna 9 may protrude outside the case 2.

As represented by the electronic component 7 shown in FIG. 2, necessary circuits are formed on the printed circuit board 6. The circuit constructed on this printed circuit board 6 is shown in FIG. FIG. 3 shows the well-known NTSC system R.
The circuit for the F modulator is shown.

Referring to FIG. 3, the video signal is supplied to the modulation degree adjusting circuit 12, and its input level is adjusted,
It is applied to the video clamp circuit 13 and clamped so that the tip of the synchronization signal included in the video signal has a constant voltage. Furthermore, the video signal is a white clip circuit 14
, The white level is clipped, and the white level is applied to the video amplitude modulation circuit 15.

On the other hand, the f _p carrier oscillator 16 responds to the resonance output of the f _p resonator 17, for example, if it is 1ch in Japan, the video carrier signal f of 91.25 MHz.
_p is generated and the high frequency amplifier circuit 18 is supplied with this image carrier signal f _p . The high frequency amplification circuit 18 amplifies the video carrier signal f _p and supplies it to the video amplitude modulation circuit 15.
The video amplitude modulation circuit 15 amplitude-modulates the video signal with the video carrier signal f _p , and supplies the modulated output to the mixing circuit 19.

On the other hand, the audio signal is given to the pre-emphasis circuit 20, and the high frequency components thereof are emphasized to secure the frequency modulation index in the high frequency range. After that, the audio signal is
It is supplied to the modulation degree adjusting circuit 21, the input level thereof is adjusted, and the result is supplied to the audio frequency modulating circuit 22.

On the other hand, the f _s carrier oscillator 23 generates an audio carrier signal f _s of 4.5 MHz according to the resonance output of the f _s resonator 24 and supplies it to the audio frequency modulation circuit 22. The audio frequency modulation circuit 22 frequency-modulates the audio signal according to the audio carrier signal f _s . The modulated output of the sound is given to the (f _p + f _s ) converter 25, and by the video carrier signal f _p output from the high frequency amplifier circuit 18, for example, in the case of 1ch in Japan, 9
It is converted to a 5.75 MHz signal. This signal (f _p +
f _s ) is _supplied to the mixing circuit 19, and the video modulation output (f
_p ), and thereafter, the high-frequency component is removed by the bandpass filter 26, the power is amplified by the power amplifier circuit 27, and radiated into the air through the transmitting antenna 9.

FIG. 3 further shows a video signal input terminal 28 for inputting a video signal and an audio signal input terminal 29 for inputting an audio signal, as well as a power supply voltage terminal 30 and a ground terminal 31. . These terminals 28-3
1 is electrically connected to the corresponding contact provided in the connector 8.

The RF modulator 1 as described above is used.
When it is mounted on a video device such as a video camera, a monitor device such as a television receiver or a receiving device such as a video tape recorder, which receives the video signal, receives the modulated signal transmitted from the RF modulator 1. Need a receiving antenna for. In this case, when a receiving antenna such as an indoor antenna is already connected to the receiving device, the special receiving antenna as described above is not required. At present, television receivers equipped with an A / V terminal are in widespread use. When such a television receiver is used as a receiving device, the A / V terminal is used.
A reception adapter equipped with an antenna, a tuner, and a VIF can be attached to the terminal for reception. In this case, normally, it is not necessary to reconnect the connection of the antenna terminal part which is considered to be already connected, and even a simple monitor device or display device without a built-in tuner is provided with an A / V terminal. If so, desired reception can be performed.

FIG. 4 shows an RF according to another embodiment of the present invention.
It is a perspective view showing the appearance of modulator 1a.

In this embodiment, the transmitting antenna 9a is
It is attached to the corner portion of the case 2. The base portion 32 of the transmitting antenna 9a is rotatable with respect to the case 2, and the transmitting antenna 9a is rotatable about the shaft 33 with respect to the base portion 32. Further, the transmitting antenna 9a has a rod antenna configuration that can be expanded and contracted, like the transmitting antenna 9 described above. In addition, a storage portion 34 for the transmitting antenna 9a is formed with a recess along the short side of the case 2. A notch 36 that exposes the tip end portion 35 of the transmitting antenna 9a is formed at the end of the storage portion 34.

The transmitting antenna 9 housed in the housing 34
The a can be raised as indicated by arrow 37 and its direction can be changed as indicated by arrow 38. Also, arrow 3
The length can be increased, as shown at 9.

In FIG. 4, elements corresponding to those shown in FIG. 1 are designated by the same reference numerals, and duplicated description will be omitted.

In each of the embodiments described above, the RF modulators 1 and 1a are provided with the transmitting antennas 9 and 9a, respectively. Such transmitting antennas are provided on the main body side of the video equipment such as a video camera. May be provided. In this case, the transmitting antenna is preferably treated as an optional accessory like the above-described receiving antenna, and is attached to the main body of the video device only when necessary. Further, when a transmitting antenna is provided on the video equipment side as described above, a signal to such a transmitting antenna is
It is output via a connector provided in the RF modulator.

[Brief description of drawings]

FIG. 1 is an RF modulator 1 according to an embodiment of the present invention.
3 is a perspective view showing the external appearance of FIG.

FIG. 2 is an enlarged cross-sectional view taken along the line II-II in FIG.

FIG. 3 is a block diagram showing an electric circuit formed on the printed circuit board 6 shown in FIG.

FIG. 4 is a perspective view showing an appearance of an RF modulator 1a according to another embodiment of the present invention.

[Explanation of symbols]

 1,1a RF modulator 2 Case 6 Printed circuit board 7 Electronic component 8 Connector 9,9a Transmission antenna 15 Video amplitude modulation circuit 19 Mixing circuit 22 Audio frequency modulation circuit 27 Power amplification circuit

Claims (1)

[Claims] 1. A card-type case, a circuit board housed in the case, and an electrical connection to the circuit board,
An RF modulator comprising: a connector disposed along one side; wherein the circuit board includes a modulation circuit and a circuit for amplifying a modulation output.