JPH0331020B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is an automotive receiver that increases reception sensitivity, reduces the adverse effects of noise from the engine, and improves mountability. A receiving antenna is installed in the trunk as an electric antenna, and can be used, for example, in a car radio.

[Conventional technology]

BACKGROUND ART Conventionally, active antennas have been known in which a part of a receiver circuit is integrated with an antenna or an active element is provided on the antenna side in order to improve antenna sensitivity and noise characteristics.

Automobile antennas are installed on the pillar next to the driver's seat, in the trunk of the vehicle, or on the windshield or rear glass of the vehicle.

[Problem to be solved by the invention]

However, when configuring a receiver for a car by incorporating the idea of an active antenna, it is necessary to increase sensitivity and reduce noise.
Until now, it has not been pursued what kind of structure is optimal when mounting ease is also taken into account.

For example, in Japanese Patent Application Laid-open No. 56-27538, a tuning circuit and a high-frequency amplifier are integrated with the antenna, and this tuning circuit is remotely controlled from a remote control unit. There are known methods that attempt to eliminate the effects of noise carried over long coaxial cables.

However, in the above configuration, it is not clear where and in what form the antenna should be configured, and it is also not clear how the receiver at the stage subsequent to the high frequency amplifier should be provided.

In recent years, antennas for automobiles are best configured as electric antennas (motor antennas), taking into consideration the differences between car washes, city driving and suburban driving, and parking in a garage. However, in the above conventional configuration, there is no disclosure of how to configure it in relation to the motor antenna.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an automotive receiver that is mounted on a vehicle as a motor antenna, has good sensitivity, can reduce the influence of noise from the vehicle engine, etc., and is easy to install. shall be.

[Means to solve the problem]

To this end, the present invention provides a receiving antenna 1 configured to protrude outward from the trunk portion of the vehicle body 21 so as to be extendable and retractable.
1. A receiving section 20 provided in the trunk of the vehicle body 21; An operating section provided in the driver's seat of the vehicle compartment 22 in the vehicle body 21 and connected to the receiving section 20 by operating wiring 23. 16, and a speaker 1 provided in at least the vehicle interior 22 and into which the audio signal taken out from the receiving section 20 is inputted via audio signal wiring.
8a and 18b, the receiving unit 20 is a motor antenna mechanism that drives a cable 24 coupled to the receiving antenna in accordance with the operation of a motor 27 to control the expansion and contraction state of the receiving antenna. and a metal housing 29 that accommodates the mechanism, and the receiving section 20 further includes a tuning circuit 13 that is integrally attached to the housing 29 and that is directly connected to at least the receiving antenna. , a high frequency amplification circuit 19 that amplifies the reception signal whose tuning is selected by the tuning circuit 13; and the high frequency amplification circuit 19.
an audio signal conversion circuit 14 that detects and amplifies a high frequency received signal from a high frequency signal and converts it into the audio signal; a tuning control command and a volume for the tuning circuit and the audio signal conversion circuit;
The receiver for an automobile is characterized by comprising a metal case 30 having a control circuit 15 for issuing a sound quality control command.

[Effect]

In the present invention, since the receiving antenna is provided in the trunk where there is less influence of noise from the engine's ignition system, etc., the receiving sensitivity is good, and
Since the receiving section, which is integrated with the receiving antenna, is housed in the trunk, the receiving section can be protected from wind and rain, and sufficient installation space can be secured. Furthermore, since the receiving section does not protrude outward, the aesthetic appearance is not adversely affected.

Furthermore, the sufficiently powered up audio signal as the final output from the receiver is routed around the vehicle interior by the audio signal wiring and reaches the speaker, so even if ignition noise etc. gets on the audio signal wiring, The impact is small. That is, the receiving section can be isolated from ignition noise and the like.

In addition, the receiving antenna can be expanded and retracted by the motor antenna mechanism, so receiving performance is good.
By integrating the housing that houses this mechanism and the metal case that houses the receiver inside, it is possible to easily attach it to the vehicle body. In other words, it can be installed with the same amount of effort as a conventional motor antenna.

Furthermore, the operating section can be substantially comprised only of members for remote control, and does not take up space around the driver's seat.

〔Effect of the invention〕

As described above, in the present invention, in the structure of the motor antenna that is currently the most sensitive,
Furthermore, it is possible to obtain a receiving device with improved sensitivity and noise resistance, and it is also easy to manufacture, as it helps secure space around the driver's seat and can be installed in a vehicle in the same way as a conventional motor antenna. Has excellent effects.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows its schematic configuration, and a receiving antenna 11 is directly connected to a tuning circuit 13 of a receiver 12 without using a coaxial cable or the like. This receiver 12 has a tuning circuit 13
It includes a high frequency amplification circuit 19 that amplifies the reception signal tuned and selected by the amplification circuit 19, and an audio signal conversion circuit 14 that detects the high frequency reception signal amplified by this amplification circuit 19 and amplifies the low frequency, and the audio signal obtained from this circuit 14 is The signal is supplied to the speaker 18 and reproduced as audio. It also has a control circuit 15 that issues tuning control commands and volume and sound quality control commands to the tuning circuit 13 and audio signal conversion circuit 14, and the control circuit 15 is provided separately from the receiver 12. An operation signal corresponding to the operation of a knob or the like is supplied from the operation section 16.

Here, the receiving antenna 11 and the receiver 1
2 is integrally constructed as a receiving section as shown by 20 in FIG. 2, for example, the receiving antenna 1
1 is configured to protrude outward from the trunk portion of the vehicle body 21, this receiving portion 20 is installed and fixed within the trunk. And this receiving section 2
The audio signal taken out from the vehicle compartment 22
For example, the speakers 18a, 1 at the rear of the rear seat
The operating section 16 is installed in the front panel of the driver's seat in the vehicle compartment 22, and the operating section 16 and the receiving section 20 are connected by a wiring 23.

FIG. 3 shows a specific configuration example of the receiving section 20 installed in the trunk of the vehicle body 21, and the receiving antenna 11 is made of a metal rod-shaped body.
As is well known as a motor antenna, its proximal end is coupled to a flexible cable 24 made of an insulator (not shown in detail), and this cable 24 is wound around a reel 25. This reel 25
A gear 26 is coaxially connected to the reel 25, and this gear 26 is rotated by a worm gear 28 which is rotated by a motor 27.
The expansion and contraction state of the antenna 11 is controlled by rotation control. These motor antenna mechanisms are housed and fixed in a metal housing 29, and the housing 29 is attached and fixed to an exterior plate or the like of the vehicle body 21 with screws (not shown).

Further, a metal case 30 is integrally attached to the housing 29, and this metal case 30
The receiver 12 is housed inside. This receiver 12
A contact piece 31 connected to the tuning circuit 13 inside is protruded, and this contact piece 31 elastically contacts the receiving antenna 11, so that the electromotive force of the antenna 11 corresponding to radio wave reception is transmitted to the receiver. 12 tuning circuits 13 are used for detection. Reference numeral 32 denotes a lead-out terminal board, which includes an audio signal circuit from the receiver 12, a drive current circuit for the motor 27, and a grounding circuit. Then, the speaker 18 is connected to the lead-out terminal plate 32.
a, 18b and further wiring to the operating section 16 is performed.

That is, in the radio receiving apparatus configured as described above, the electromotive force generated in the receiving antenna 11 is guided to the tuning circuit 13 of the receiver 12 through the contact piece 31. In this case, the contact piece 31 can be configured to be extremely short, and is provided at a sufficient distance from the housing 29 and the metal case 30, which are at ground potential, so as to face each other through air with a small dielectric constant. . Therefore, the capacitance between this contact piece 31 and the ground can be made extremely small. This allows the capacitance to be much smaller than when the antenna and tuning circuit are connected using a long coaxial cable, as is the case with conventional radios. Any drawbacks due to the presence of are effectively ameliorated.

This is especially true for car radio receivers,
Extremely strong electric fields in some places due to the movement of cars,
Alternatively, this will have a very large effect in the case of a reception environment where the received electric field fluctuates greatly, such that the electric field is extremely weak in some places.

Furthermore, since it is sufficient to attach an operating section with fewer parts to the front panel section of the driver's cab, the limited space of the front panel section can be used more effectively.

Furthermore, in the radio receiving apparatus described above, a high frequency amplification circuit 19 is provided at a subsequent stage of the tuning circuit 13. Therefore, this high-frequency amplification circuit 19 amplifies only the signal corresponding to the tuned received radio wave, and even if nonlinearity exists in the amplification circuit 19, interference such as interference will not occur. It is possible to effectively improve reception sensitivity without causing any problems.

In addition, when transmitting the electromotive force corresponding to the received radio waves from the antenna to the tuning circuit section using a coaxial cable, as is conventional practice, this coaxial cable is routed inside the shielded vehicle body, so it absorbs the broadcast radio waves. However, signals from various noise sources such as the spark plug system inside the vehicle entered the vehicle, causing a deterioration of the signal-to-noise ratio. However, as in the above embodiment, after converting to an audio signal and making the signal high enough, the speaker 1
8a and 18b, the signal is hardly affected by noise intrusion, and the signal-to-noise ratio is greatly improved.

In addition, since the receiving antenna 11 and the tuning circuit 13 are integrally assembled and can be commercialized, it is possible to adjust the circuit so that the receiving antenna and the tuning circuit operate optimally before shipping. It is no longer necessary to make adjustments every time the device is installed in a car, as was the case in the past, and stable reception characteristics can be effectively set.

As described above, the above embodiment is a car radio receiver that can effectively improve reception sensitivity and improve noise characteristics, and is also capable of coupling adjustment with an antenna for tuning. This can be done beforehand, and the effects are significant.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram illustrating a radio receiver according to an embodiment of the present invention, FIG. 2 is a perspective view schematically showing how the above embodiment is attached to a vehicle body, and FIG. FIG. 3 is a cross-sectional view showing an example of the configuration of the receiving section in the embodiment. 11...Receiving antenna, 12...Receiver, 13
... Tuning circuit, 14 ... Audio signal conversion circuit, 16 ... Operation section, 18a, 18b ... Speaker, 19 ... High frequency amplification circuit, 20 ... Receiving section,
21... Vehicle body, 22... Vehicle interior, 27... Motor.

Claims (1)

[Scope of Claims] 1. A receiving antenna 11 configured to protrude outward from a trunk portion of a vehicle body 21 so as to be extendable and retractable; a receiving portion 20 provided within the trunk of the vehicle body 21; an operating section 16 provided at the driver's seat of the vehicle interior 22 and connected to the receiving section 20 by operating wiring 23; and an operating section 16 provided at least within the vehicle interior 22 and taken out from the receiving section 20. Speaker 1 to which audio signals are input via audio signal wiring
8a and 18b, the receiving unit 20 is a motor antenna mechanism that drives a cable 24 coupled to the receiving antenna in accordance with the operation of a motor 27 to control the expansion and contraction state of the receiving antenna. and a metal housing 29 that accommodates the mechanism, and the receiving section 20 further includes a tuning circuit 13 that is integrally attached to the housing 29 and that is directly connected to at least the receiving antenna. , a high frequency amplification circuit 19 that amplifies the reception signal whose tuning is selected by the tuning circuit 13; and the high frequency amplification circuit 19.
an audio signal conversion circuit 14 that detects and amplifies a high frequency received signal from a high frequency signal and converts it into the audio signal; a tuning control command and a volume for the tuning circuit and the audio signal conversion circuit;
1. A receiver for an automobile, comprising a metal case 30 having a control circuit 15 that issues a sound quality control command. 2 The housing 29 and the metal case 3
The tuning circuit and the receiving antenna are directly connected in the housing 29 and the metal case 30 by a contact piece 31 facing each other at a predetermined distance from each other through air only. An automobile receiving device according to claim 1, characterized in that: