JPH079571Y2 - Car audio system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an on-vehicle audio device having a battery charging function.

[Conventional technology]

The current on-vehicle audio devices are increasingly provided with a clock function or the like as an additional function, and the audio devices themselves have become multi-functional. Therefore, it is necessary to constantly operate the necessary parts of the audio device. That is, in order to make the audio device multifunctional, for example, it is necessary to store (back up) the value of the electronic volume, the reception frequency, etc. from the time the power is turned off to the time the power is turned on again. It is necessary for the thing to maintain the timing operation. For this reason, such an audio device is provided with a backup power supply line to which a backup voltage is constantly supplied, in addition to the accessory power supply line passing through the ignition switch.

When such a backup voltage is supplied, current is constantly discharged from the battery, so if the vehicle is not operated for a long period of time, the battery voltage will drop due to over discharge,
The engine may not start or the battery may deteriorate.

As a solution to such a problem, there is a method in which a solar cell is installed on a sunroof or a dashboard when the vehicle is left for a long time, and electric power from the solar cell is supplied to the battery via a cigar socket.

[Problems to be solved by the device]

However, such a device requires a separate cord for guiding the electric power generated by the solar cell to the cigar socket, and also requires an operation for disposing the cord.

The present invention solves such a problem.

[Means for Solving the Problems]

The present invention solves such a problem, and is characterized in that a solar cell is arranged on the surface facing the window side of a vehicle-mounted speaker.

Further, as a preferable application example, there is a vehicle-mounted audio device which is used together with a vehicle-mounted audio device having a power supply line directly connected to a battery and is characterized in that the solar cell is connected to the power supply line.

Further, as a preferable application example, there is a vehicle-mounted audio device characterized in that the solar cell and the power supply line are connected by using a signal transmission cable for transmitting a signal of the audio device to the speaker device.

[Action]

The solar cell provided in the speaker device receives sunlight incident through the window to generate electricity. Then, the electric power is charged into the battery through the signal transmission cable between the vehicle-mounted audio equipment and the speaker device, and the power supply line directly connected to the battery of the vehicle-mounted audio equipment.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the present invention.

The audio device 1 includes a signal reproduction unit 11 such as a radio and a signal reproduction unit 11
A microcomputer (hereinafter, referred to as a microcomputer) 12 that controls the clock and has a built-in clock function is provided. The microcomputer 12 controls the operation of the signal reproducing unit 11 according to the operation of the operation unit 13 and the display control on the display unit 14, such as the time display.

The microcomputer 12 is always energized by the backup power supply line BU, that is, the line directly connected to the battery, in order to maintain the clock function.

The battery 3 is charged by a generator (not shown) that generates power by the rotation of the engine, and supplies the charged electric power to the acoustic device 1 and electric components not shown.

The speaker device 2 includes a speaker unit 21 and
As shown in Fig. 2, the solar cell 22 has its speaker box.
It is provided on the back of 26.

The audio device 1 and the speaker device 2 are connected via a cable 4, and the audio signal output from the signal reproducing section 11 is sent to the speaker unit 21 via the capacitor C1, the cable 4 and the capacitor C2. In addition, the electric power generated by the solar cell 22 is guided to the regulator 15 via the cable 4 and a voltage suitable for charging the battery 3 (for example, 14V).
After being converted to, the power is supplied to the battery 3 through the diode D and the line BU.

The voltage generated by the solar cell is DC and is cut off by the capacitors C1 and C2.
Since the signal is not applied to the signal reproduction unit 11, the reproduction of the acoustic signal is not hindered.

Further, according to this embodiment, the sun rays can be efficiently converted into electric power. That is, the case where the area of the rear tray 10 is S2 as shown in FIG. 3 and the sun rays are irradiated from the direction of the arrow A will be described. Batteries in the rear tray
Assuming that the solar cells are arranged above 10, the solar cells having the area S1 are equal to those received. But actually the rear tray 10
The maximum area of the solar cell that can be installed in S2 is S2 (S1> S
2) After all, the solar cell provided on the back surface of the speaker box 26 can receive a larger amount of sunlight and can generate a larger amount of power than the solar cell provided on the rear tray 10.

Also, when the sun rays are emitted from the direction of arrow B,
Since the incident angle of the light rays on the rear window glass 6 is large, a considerable amount of the light rays are reflected by the rear window glass 6 and the power generation efficiency is low (when the incident angle is equal to or greater than the critical angle, the sun rays are reflected on the rear window glass 6). Is totally reflected by the solar cell, and the amount of power generated by the solar cell becomes 0).

Therefore, it is desirable that the solar cell effectively receive a light beam from a direction substantially perpendicular to the rear window glass 6 as indicated by arrow A.

That is, the light receiving surface of the solar cell is the rear window glass 6
It is desirable to dispose the solar cell 22 in parallel with the rear window glass in this embodiment by disposing the solar cell 22 on the back surface of the speaker box 26. The power generation efficiency is improved.

FIG. 4 is a block diagram showing a second embodiment of the present invention, and the same parts as those in FIG. 1 are designated by the same reference numerals.

In this embodiment, a 3-wire type cable 5 is used instead of the 2-wire type cable 4 shown in FIG. The line 51 of the cable 5 is for transmitting the acoustic signal from the signal reproducing unit 11 to the speaker unit 21, and the line 53 is for transmitting the electric power generated by the solar cell 22.

The line 53 is a ground line common to the speaker unit 21 and the solar cell 22. Then, the electric power generated by the solar cell is transmitted to the battery 3 via the line 53, the regulator 15, the diode D, and the line BU.

By using the three-wire type cable 5 in this way, the signal from the audio device to the speaker unit 21 and the electricity generated from the solar cell 22 can be completely separated, and the solar cell responds to the sound reproduced by the speaker unit 21. The influence of generated electricity can be reduced as much as possible.

FIG. 5 is a block diagram showing a third embodiment of the present invention, which is a so-called push-pull type signal reproducing unit for driving the speaker unit 21 by applying voltages of opposite phases to the line 51 and the line 53, respectively. The present invention is applied to 16 and a 3-wire type cable 5 is applied to the signal reproducing section 16. The same parts as those in FIG. 1 are designated by the same reference numerals.

In the present embodiment, the output stage of the signal reproducing unit 16 and the speaker device 2
The transformers 17 and 25 are installed at the input stage of
Is connected to the center tap of the primary coil of the transformer 25, and in-phase voltage is applied to both the lines 51 and 53.

The electric power transmitted through the lines 51 and 52 is 2 of the transformer 17.
It is taken out from the center tap of the secondary coil and supplied to the positive electrode of the battery 3 via the regulator 15, the diode D and the line BU.

The negative electrode of the solar cell is connected to the negative electrode of the battery via line 52.

[Effect of device]

As described in detail above, according to the present invention, since the solar cell is arranged on the surface of the in-vehicle speaker device that faces the window side, the sun rays can be efficiently converted into electric power.

Also, if the power generated by the solar cell installed in the speaker device is used to charge the storage battery using the power line of the audio equipment directly connected to the battery, the cable that transmits the power of the solar cell to the storage battery will be wired to the audio equipment. Since the signal transmission cable for connecting the audio device and the speaker device can be wired at the same time as the wiring work, there is no need to perform a special wiring work and the workability is improved.

Furthermore, if the signal transmission cable is used to connect the wiring between the solar cell and the audio equipment, it is not necessary to provide a special cable for that purpose, and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a block diagram showing a first embodiment of the present invention, FIGS. 2 and 3 are a perspective view and a side view for explaining a speaker device 2, respectively, and FIG. FIG. 5 is a block diagram showing the second and third embodiments of the present invention. In the figure, 1: audio device, 2: speaker device, 3: battery, 4,5:
cable.

Claims (1)

[Scope of utility model registration request] 1. An in-vehicle audio device having a vehicle-mounted speaker device provided with a solar cell and a power supply line directly connected to a battery, wherein the solar cell and the power supply line are connected to a signal of the audio device. An in-vehicle acoustic device connected using a signal transmission cable for transmitting to the speaker device.