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1. A car mobile phone connection device comprising: a USB connector socket or a mobile phone holder composed of a matching USB connector plug and a mobile phone connection holding mechanism; wherein, the USB connector socket, in addition to USB connector jack electrodes, also has sunken external thread, raised external thread, sunken bayonet slot, raised bayonet slot, screw holes, sunken external thread and bayonet slot, raised external thread and bayonet slot, sunken external thread and screw holes, raised external thread and screw holes, sunken external bayonet slot and screw holes, raised external bayonet slot and screw holes, sunken external thread and bayonet slot plus screw holes, or raised external threads and bayonet slots plus screw holes; the matching USB connector plug of the mobile phone holder, in addition to the matching USB connector plug electrodes, also has flange and internal thread locking cap, flange and bayonet locking cap, flange and screw through-hole plate and screws, or screw through-hole flange and screws; the mobile phone connection holding mechanism of the mobile phone holder has one or more of a mobile phone connector plug, wireless charging board, NFC communication board, which are connected to a mating USB connector plug through internal or external circuits; the USB connector socket is installed on the car, and the mobile phone is installed on the mobile phone connection holding mechanism; a mobile phone socket is sleeved on the mobile phone connector plug of the mobile phone connection holding mechanism for wired connection, in order to perform fixed voltage or current power supply, variable voltage or current power supply, or smart fast and slow charging according to the power supply protocol; or the mobile phone is closed to one or more of the wireless charging board or the NFC communication board of the mobile phone connection holding mechanism for wireless power connection or wireless signal connection; for wireless power connection, the mobile phone is powered or intelligently fast and slow charged through wireless charging board by fixed or adjustable wireless transmission power according to corresponding wireless power supply protocol; wherein the external thread, the bayonet slot USB connector socket, and the matching mobile phone holder further have a set of characteristics including: a mating USB connector plug with flange and internal thread locking cap, or flange and bayonet locking cap, inserts into the external thread or bayonet slot USB connector socket, such that: the flange end face of the mating USB connector plug contacts the inlet end face of the bayonet slot USB connector socket; screw the internal thread of the locking cap of the mating USB connector plug into the external thread of the bayonet slot USB connector socket, or insert and screw the bayonet claw of the locking cap of the mating USB connector plug into the bayonet slot of the bayonet slot USB connector socket, so that the locking cap and the bayonet slot USB connector socket clamp the flange; the mating USB connector plug and the bayonet slot USB connector socket are electrically connected, and at the same time they are mechanically fixed by threads or bayonet; the mobile phone connection holding mechanism is fixed with the matching USB connector plug, and also supports the mobile phone; the external thread or bayonet slot USB connector socket is inserted by a traditional mating USB connector plug without flange and internal thread locking cap, nor flange and bayonet locking cap, such that: the external thread or bayonet slot of the bayonet slot USB connector socket is not used for matching with the traditional plug; the bayonet slot USB connector socket and the traditional plug are electrically connected without mechanical threads or bayonet locking; the mating USB connector plug with flange and internal thread locking cap, or flange and bayonet locking cap, inserts into a traditional USB connector socket without external threads nor bayonet slot, such that: the flange end face of the mating USB connector plug touches or does not touch the inlet end face of the traditional socket; the internal thread locking cap or bayonet locking cap of the mating USB connector plug is not used for matching with the traditional socket; the mating USB connector plug and the traditional socket are electrically connected without mechanical threads or bayonet locking; or, the set of characteristics alternatively comprise: the mating USB connector plug with flange and screw through-hole plate and screws, or screw through-hole flange and screws inserts into the screw hole USB connector socket, such that: the end face of the flange or the screw through-hole flange of the mating USB connector plug contacts the inlet end face of the socket; the screws of the plug go through the through-holes of the screw through-hole plate or the screw through-hole flange, and screw into the screw holes of the bayonet slot USB connector socket, so that the screw through-hole plate and the bayonet slot USB connector socket clamp the flange, or the screws and the socket clamp the screw through-hole flange; the mating USB connector plug and socket are electrically connected, and at the same time they are mechanically fixed by screws; the mobile phone connection holding mechanism is fixed with the matching USB connector plug, and also supports the mobile phone; the screw hole USB connector socket is inserted by the traditional mating USB connector plug without flange and screw through-hole plate and screws, nor screw through-hole flange and screws, thereby: the screw holes of the socket are not used for matching with traditional plugs; the socket and the traditional plug are electrically connected without mechanical screw locking; the mating USB connector plug with flanges and screw through-hole plate and screws, or screw through-hole flange and screws, inserts into the traditional USB connector socket without screw holes, thereby: the end face of the flange or the screw through-hole flange of the mating USB connector plug contacts or does not contact the inlet end face of the socket; the screws of the mating USB connector plug are not used for matching with the traditional socket; and the mating USB connector plug and the traditional socket are electrically connected without mechanical screw locking; wherein the USB connector sockets with external thread and bayonet slot, external thread and screw holes, external bayonet slot and screw holes, or external thread and external bayonet slot and screw holes, are configured to accept the mating USB connector plug with flange and internal thread locking cap, flange and bayonet locking cap, flange and screw through-hole plate and screws, or screw through-hole flange and screws at different times; according to the above operation, the mating USB connector plug and the bayonet slot USB connector socket are electrically connected with mechanically fixing for same locking mating type or without mechanically fixing for different locking mating type.
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