Abstract:
A radio receiver having a substantially round housing that does not exceed 7.95 cm in diameter. A front display panel having a somewhat larger perimeter than the housing is mounted to the housing. The housing and the front display panel form a weatherproof unit that meets IP66 standards. A radio receiver and an amplifier are contained within the weatherproof housing, which shields electrical circuits from precipitation and other forms of water intrusion.

Description:
FIELD OF THE INVENTION 
     This invention relates to radio receivers generally, and is more specifically directed to a radio receiver that is contained within a weatherproof housing. 
     BACKGROUND OF THE INVENTION 
     Many vehicles are used in outdoor applications that subject the interior of the vehicle to precipitation, or to bodies of water ranging from puddles to moving rivers. The interior of the vehicle may be subject to rain or melting snow, and the motion of the vehicle further subjects the interior of the vehicle, and electronic components in the vehicle, to the precipitation. Similarly, the motion of the vehicle through puddles, or across streams or similar bodies of water, can force the water into the vehicle, and subject electronic components including those mounted on the dashboard, to water damage. 
     The vehicles that are used in environments where the interior is subject to wet environments include tractors, four-wheelers, four-wheel drive vehicles, construction vehicles, boats and similar marine vehicles. Such vehicles frequently do not have radio receivers for receiving broadcast radio, such as AM and FM radio signals. Due to the rugged and rough conditions associated with the use of these outdoor vehicles, such devices are not deemed to be practical. 
     There is a need for a self-contained radio receiver that can be mounted in vehicles for outdoor use, wherein the interior of the vehicle is subject to water intrusion and other wet conditions. The device should be small and self-contained, and easily mounted in the dashboard, or within an easily formed, and relatively small hole in the interior of the vehicle. The device is also useful for mounting in other environments where water is a factor, such as spas and hot tubs. 
     SUMMARY OF THE INVENTION 
     The present invention is a radio receiver having a substantially round housing that does not exceed 7.95 cm in diameter. A front display panel having a somewhat larger perimeter than the housing is mounted to the housing. The housing and the front display panel form a weatherproof unit that meets IP66 standards. A radio receiver and an amplifier are contained within the weatherproof housing, which shields electrical circuits from precipitation and other forms of water intrusion. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is an elevation of the front display panel of the device. 
         FIG. 2  is a side elevation of the device, showing the front panel, the housing, and the back of the housing. 
         FIG. 3  is an elevation showing the back of the housing. 
         FIG. 4  is a top, plan view of the device, with an embodiment of a mounting bracket in place. 
     
    
    
     DESCRIPTION OF PREFERRED EMBODIMENTS 
     The radio receiver is preferred to have a substantially round housing  2  as shown in the drawing figures. The housing contains a radio tuner and an amplifier. 
     Since the housing that is adjacent to the front display panel is mounted within a hole or void formed in a dashboard of a vehicle in most application, there is no ventilation within the housing itself. Further, since the housing and front display panel forms a waterproof enclosure for the radio receiver, the enclosure must be generally sealed to prevent water from entering the housing. At the same time, draining heat from the device is important to the longevity of the device. 
     The housing comprises a metal back  4  in one embodiment. The back is preferred to be formed of heat conductive metal, with the metal acting as a heat sink to drain and disperse heat from the electronic circuits contained in the housing. The backing may be formed of aluminum. The backing is preferred to be formed with peaks and valleys  6 , or heat dissipating fins, so that the surface provides heat dissipation. 
     A front display panel  8  is mounted to the housing, forming the waterproof enclosure for the electronic circuits. The front display panel, in the embodiment shown, comprises controls for the radio tuner and the amplifier, and a display, which may be an LCD display  10 , that digitally indicates the radio frequency to which the radio tuner is tuned. 
     Controls may comprise a master on/off, or power, switch  12 . Controls for the tuner may include controls  14 , 16  for increasing or decreasing the reception frequency of the tuner, and a switch  18  for selecting frequency bands, such as switching from AM to FM frequencies. The amplifier controls  20 , 22  may include volume controls for increasing or decreasing amplification of the signals to the amplifier, and a switch  24  for switching between modes of input to the amplifier. 
     In one embodiment, the device has a direct current input for powering the device. In this embodiment, an input is provided for powering the radio tuner and amplifier by current provided by the vehicle. For example, the current input may be 12 volts direct current (DC) provided by the vehicle&#39;s electrical system, but could be constructed for vehicles operating on 24 volt systems. If the device is located near an AC source, a transformer may be provided to convert the current to DC. A signal output is also provided which is connected to a speaker. The signal from the amplifier is then conveyed to the speaker, so that the radio or other electronic device may be heard. 
     In a simplest embodiment, the device has a single speaker output. In another embodiment of the device, the radio tuner and amplifier provide stereo output to two (2) speakers comprising a right channel and a left channel. In another embodiment, an auxiliary input is provided that receives a signal from another electronic device, such an MP3 player or other digital source, and a particularly, a digital music source. A small digital analog converter is provided within the unit. A control available on the front display panel allows the device to be switched between the radio tuner and the input for the digital signal, with the amplifier amplifying the signal from the deck or the tuner to speaker or speakers. In another embodiment, the auxiliary input is provided by a Universal Serial Bus (USB), which may connected to a digital signal source, such as a computer or other source of digital files. 
     The radio tuner and amplifier, and if used, the digital to analog converter, are positioned within the housing, which is preferred to be substantially round in cross section, and to have a diameter of no larger than 7.95 cm. The depth of the device from the back of the display to the opposite end of the housing should not be more than 55 mm, although studs may extend an additional length from opposite sides of the housing for mounting of the device, through the use of a U shaped bracket that connects to the studs.  FIG. 4 . The circuitry contained within the waterproof enclosure must therefore be miniaturized and small enough to be contained within the housing. 
     In use, the device is mounted in a round or substantially round opening in a dashboard of a vehicle, which may already be present in the vehicle. Even if the opening is not present, it is simple matter to form a relatively small hole or void that will receive the radio receiver. The device will usually be mounted in a location where current from the vehicle is readily available. It is then simply a matter of installing and attaching a speaker or speakers to the speaker output from the device. 
     In one embodiment, the device may be mounted through the use of a U bracket  26  and studs  28 . The studs are mounted to the back  4  of the device at threaded mounting points  30 . The studs are preferred to be threaded for engagement to the device. The U bracket may be secured to a vehicle or other object to which the device is mounted. The entire depth of the device is preferred to not exceed 70 mm with U bracket in place. In the embodiment shown in  FIG. 4 , the U bracket is mounted to the metal back and extends beyond the housing at the back of the housing and at sides of the housing. The width of the metal bracket is preferred to not exceed 99 mm.