JP3509345B2 - Receiving machine - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a receiver. More specifically, a half-wave dipole antenna is formed by a conductive exterior part of the receiver, for example, punching metal for protecting the left channel speaker part of the receiver and punching metal for protecting the right channel speaker part. It is a thing.

[0002]

2. Description of the Related Art In a conventional receiver, for example, a radio cassette recorder (hereinafter referred to as "radio cassette"), a rod antenna is provided, and when receiving a broadcast signal such as a radio broadcast or a television broadcast, this rod is used. The orientation of the antenna is adjusted so that the antenna is pulled out and the reception sensitivity becomes the best.

[0003]

By the way, in such a radio-cassette, since the rod antenna is pulled out and used, the rod antenna may be an obstacle when handling the radio-cassette and may impair the appearance. In addition, the operation was troublesome because the rod antenna had to be pulled out to adjust the direction.

Therefore, the present invention provides a receiver which does not disturb the handling, does not impair the appearance, and does not require the antenna to be operated so as to improve the reception sensitivity.

[0005]

SUMMARY OF THE INVENTION A receiver according to the present invention has a substantially circular shape using a conductive exterior part as a receiving antenna.
In a receiver with a columnar shape, use a conductive exterior
Divided into multiple areas along the outer circumference of a cylinder in the non-conducting state
Then, select one or more of the multiple areas to
For receiving by switching the selected area with the tenor
The direction of the antenna is switched . For example, two adjacent areas are selected from a plurality of areas to form a half-wavelength dipole antenna.

In the present invention, the conductive exterior portion is not
It is divided into multiple areas along the outer circumference of the cylinder in the conductive state.
Then, one or more of the plurality of regions are selected and used as a receiving antenna. For example, a half-wave dipole antenna is constructed by using punching metal on the right channel side and the left channel side.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION A first embodiment of a receiver according to the present invention will be described below with reference to the drawings. FIG. 1 is an external view when the receiver is a radio-cassette 10, for example.

In FIG. 1, a punching metal 13L is provided on the left channel side of the cabinet 12 of the speaker unit 11, and a punching metal 13R is provided on the right channel side. This punching metal 13L, 1
3R is made of a conductive material, and the punching metal 13L and the punching metal 13R are arranged in an insulated state by the cabinet 12.

As shown in FIG. 1, a mounting portion 14 for mounting a cassette tape and a compact disc and an operation portion 15 for switching the operation of the radio cassette 10 are arranged on the upper surface of the speaker portion 11. The operation section 15 is operated to perform the reproducing operation of the cassette tape or the compact disc mounted in the mounting section 14 and the receiving operation of the broadcast signal.

The punching metals 13L and 13R are shown in FIG.
2, which is a schematic cross-sectional view taken along the line II ', the end 13m of the punching metal 13L on the punching metal 13R side is connected to the antenna terminal 21a of the tuner portion 21. The end 13n of the punching metal 13R on the punching metal 13L side is connected to the antenna terminal 21b of the tuner 21.

Next, FIG. 3 shows a main part of the configuration of the first embodiment. In FIG. 3, the punching metal 13L is connected to the antenna terminal 21a and the punching metal 13R.
The antenna terminal 21b connected to is connected to the front end 22 of the tuner unit 21.

In the front end 22, only a specific band is selectively amplified from the broadcast signal received by the punching metal 13L, 13R. Further, the amplified broadcast signal is frequency-converted to generate the intermediate frequency signal IF of the broadcast signal to be received. The intermediate frequency signal IF obtained by the front end 22 is supplied to the intermediate frequency signal processing circuit 23.

The intermediate frequency signal processing circuit 23 amplifies the intermediate frequency signal IF and removes signals other than the desired broadcast signal. Further, the intermediate frequency signal IF is detected and the low frequency signal SA is taken out. This low frequency signal SA is
The noise cancel circuit 24 removes noise and then outputs. When the broadcast signal is FM stereo broadcast, the intermediate frequency signal processing circuit 23 outputs the low-frequency signal SA that is a stereo composite signal. Therefore, the stereo composite signal is transmitted to the decoder circuit 25 via the noise canceling circuit 24. When supplied, the left channel audio signal SL and the right channel audio signal SR are reproduced.

The low-frequency signal SA or the left-channel audio signal SL and the right-channel audio signal SR are amplified by a low-frequency amplifier circuit (not shown) and output as sound from the speaker section 11 shown in FIG.

As described above, according to the above-described first embodiment, the end portions 13m of the punching metals 13L and 13R,
Punching metal 13L, 13 with 13n as a feeding point
Since the half-wavelength dipole antenna is composed of R, the broadcast signal can be received without providing the rod antenna, and the radio cassette player 10 can be made inexpensive.

Next, the appearance of the second embodiment is shown in FIG. In FIG. 4, parts corresponding to those in FIG. 1 are designated by the same reference numerals, and detailed description thereof will be omitted.

In the radio-cassette 30 shown in FIG. 4, the radio-cassette 3
The entire side surface of 0 is the speaker unit 31. The speaker unit 31 is divided into, for example, three equal parts, and punching metals 33A to 33C are arranged in each of the three parts. The punching metals 33A to 33C are similar to the punching metals 13L and 13R shown in FIG.
The two are arranged in an insulated state. Left-channel audio and right-channel audio are output from the speaker unit 31 provided with the punching metals 33A to 33C.

The punching metals 33A to 33C are shown in FIG.
5, which is a schematic cross-sectional view taken along line II - II 'of FIG.
Connected with. For example, the end 33e of the punching metal 33A on the punching metal 33C side is connected to the terminal 34a of the signal selecting unit 34, and the punching metal 33A
The end 33f of the punching metal 33B on the side A is connected to the terminal 34b of the signal selecting section 34. Similarly, the end 33g of the punching metal 33B on the punching metal 33A side
Is connected to the terminal 34c of the signal selection unit 34, and the end 33h of the punching metal 33B on the punching metal 33C side is connected to the terminal 34d of the signal selection unit 34.
In addition, punching metal 33C punching metal 33B
The end 33j on the side is connected to the terminal 34e of the signal selecting unit 34, and the end 33k on the side of the punching metal 33A of the punching metal 33C is the terminal 34f of the signal selecting unit 34.
Connected to. The signal selecting section 34 is provided in the tuner section 41.
Are connected to the antenna terminals 41a and 41b.

Next, FIG. 6 shows an essential part of the configuration of the second embodiment. Note that, also in FIG. 6, portions corresponding to those in FIG. 3 are denoted by the same reference numerals, and detailed description thereof will be omitted.

The terminals 34a to 34f of the signal selecting section 34 are
As mentioned above, the punching metals 33A to 3 respectively.
It is connected to the ends 33e to 33k of 3C. The movable terminal 34g of the signal selection unit 34 is connected to the antenna terminal 41a of the tuner unit 41, and the movable terminal 34h is connected to the antenna terminal 41b of the tuner unit 41. The signals selected by the signal selection unit 34 are switched based on a switching signal SS supplied from a multipath detection circuit 44 described later, and the movable terminal 34g is switched by the switching signal SS.
And the movable terminal 34h are interlocked and switched.

Antenna terminals 41a, 4 of the tuner section 41
1b is connected to the front end 22. The intermediate frequency signal processing circuit 43 corresponds to the intermediate frequency signal processing circuit 23, and the low frequency signal SA is extracted from the intermediate frequency signal IF. Furthermore, in the intermediate frequency signal processing circuit 43,
For example, when the received broadcast signal is FM broadcast, the amplified intermediate frequency signal IFA before being amplitude limited is supplied to the multipath detection circuit 44.

In the multipath detection circuit 44, the AM component generated by the interference between the direct wave of the FM broadcast and the reflected wave generated by the building or the like is detected from the intermediate frequency signal IFA, and AM detection is performed to detect the multipath level. Is determined. Here, when the multipath level is high, that is, when the reception state is poor, the terminals selected by the signal switching unit 34 are sequentially switched by the switching signal SS, and the reception state is set to a good state. For example, the movable terminal 34
When g and 34h are located on the terminals 34a and 34f side, respectively, the end 33 of the punching metal 33A and 33C is formed.
e, 33k as a feeding point, punching metal 33A, 3
A half-wavelength dipole antenna is composed of 3C. At this time, if the reception state is poor, the movable terminals 34g and 34h are set to the terminals 34c and 34b, respectively. In this case, since the half-wave dipole antenna is composed of the punching metals 33A and 33B with the ends 33f and 33g of the punching metals 33A and 33B as feeding points, the direction of the antenna can be switched. Also in this case, if the reception condition is poor, the movable terminals 34g and 34h are respectively connected to the terminal 3
4e, 34d side. In this case, the ends 33h and 33j of the punching metals 33B and 33C are used as the feeding points.
Since the half-wave dipole antenna is composed of the punching metals 33B and 33C, the direction of the antenna can be further switched.

As described above, according to the second embodiment,
The punching metals 33A to 33C are used as antennas, and the feeding point is selected so that the reception state is the best, and the direction of the antennas is automatically switched, so that the broadcast signal is received without providing a rod antenna. In addition, it is not necessary to change the direction of the radio-cassette 30 to adjust the direction of the antenna, and the operation can be simplified.

In the second embodiment, the direction of the antenna is switched to three directions by using the three punching metals 33A to 33C. However, for example, the punching metals 33A to 33C are divided into upper and lower parts. However, if the positions of the upper punching metal and the lower punching metal are laterally offset, not only the orientation of the antenna using the upper punching metal but also the antenna using the lower punching metal can be changed. Since it can be oriented, the reception state can be improved.

Further, the orientation of the antenna is not limited to switching according to the level of the multipath, but also switching according to the noise level of the low frequency signal SA and the signal level of the intermediate frequency signal IF supplied to the noise canceling circuit 24. Of course, it is also good.

As described above, according to the above-described embodiment,
Since punching metal can be used as an antenna,
The broadcast signal can be received without providing the rod antenna, and the punching metal is selected so that the reception state is the best, so that it is not necessary to operate the receiver to adjust the orientation of the antenna.

Although the half-wave dipole antenna is constructed by using two punching metals in the above-mentioned embodiment, the antenna is not limited to the half-wave dipole antenna. Further, it goes without saying that the received signal may be not only a broadcast signal but also a communication signal or the like.

[0028]

According to the present invention , the conductive exterior portion is divided into a plurality of regions along the outer periphery of the substantially cylindrical column in a non-conducting state, and one or more of the plurality of regions are selected. The antenna is used as a receiving antenna, and the selected area is switched to switch the direction of the receiving antenna.

Therefore, the broadcast signal can be received without providing a rod antenna or the like, so that the receiver can be made inexpensive. Further, since the feeding point is selected so that the reception state is the best and the direction of the antenna is automatically switched, the operation can be simplified.

[Brief description of drawings]

FIG. 1 is a diagram showing an appearance of a first embodiment of a receiver according to the present invention.

FIG. 2 is a schematic cross-sectional view taken along the line I-I ′.

FIG. 3 is a diagram showing a configuration of a first embodiment of a receiver according to the present invention.

FIG. 4 is a diagram showing an appearance of a second embodiment of a receiver according to the present invention.

FIG. 5 is a schematic cross-sectional view taken along line II-II ′.

FIG. 6 is a diagram showing a configuration of a second embodiment of a receiver according to the present invention.

[Explanation of reference numerals] 10,30 Radio cassette recorder (radio cassette player) 11,31 Speaker section 12,32 Cabinet 13L, 13R, 33A, 33B, 33C Punching metal 13m, 13n, 33e, 33f, 33g, 33h, 3
3j, 33k End part 14 Mounting part 15 Operating part 21, 41 Tuner part 21a, 21b, 41a, 41b Antenna terminal 22 Front end 23, 43 Intermediate frequency signal processing circuit 24 Noise canceling circuit 25 Decoding circuit 34 Signal selecting part 44 Multipath Detection circuit

Front page continuation (58) Fields surveyed (Int.Cl. ⁷ , DB name) H01Q 1/44 H01Q 1/24 H01Q 9/16

Claims (2)

(57) [Claims] 1. A conductive exterior part as a receiving antenna
In the receiver having the substantially cylindrical shape used, the conductive exterior portion is provided along the outer periphery of the substantially cylindrical shape in a non-conductive state.
To divide into multiple areas and select one or more of the multiple areas to receive
Use as an antenna and switch the selected area
A receiver characterized by switching the direction of the receiving antenna . 2. Two areas adjacent to the plurality of areas
2. The receiver according to claim 1 , wherein the half-wavelength dipole antenna is selected by selecting .