Loss-preventing alarm for cellphone
The mobile phone attachment device that the present invention relates to communicate by letter more specifically refers to a kind of loss-preventing alarm for cellphone.
Mobile phone develops so far, the miniaturization that becomes of having healed.And along with the miniaturization of mobile phone, the probability of relative loss also heightens, and is difficult for discovering, thereby has class to ask the city with the cuff link that calling set uses on the market then, and cuff link is exclusively used in button and ties between waist border and mobile phone.Though this method can avoid mobile phone to come off, but when taking off mobile phone and place situations such as desktop or wash platform, but have no to prevent the warning effect forgotten, also often hear the user and forget and fetch that situation about losing at once takes place after using or putting taking off after leaving the scene.
In view of this, main purpose of the present invention provides a kind of loss-preventing alarm for cellphone, in case when mobile phone and user's spacing surpassed set point, this device can send vibration or buzzing immediately, fetches mobile phone rapidly to remind the user.
To achieve these goals, the present invention adopts following technical scheme: this loss-preventing alarm for cellphone is made up of reflector and receiver; Wherein, reflector is made up of oscillator stage, amplifying stage, by switch control emission high-frequency carrier signal; Receiver is made up of with buzzer or vibrating elements amplifying circuit, detection voltage-multiplying circuit, switching circuit, oscillating circuit, is used to receive the high-frequency carrier signal from aforementioned reflector; Once when surpassing setpoint distance and can't receive high-frequency carrier signal because of the spacing of reflector and receiver, this receiver sends buzzing or vibration immediately, fetches mobile phone rapidly to remind the user.
Described reflector is to be incorporated on the battery circuit of mobile phone, and the power supply of reflector is supplied by battery.
Described receiver can be provided with clip or retainer, is tied to user's waist border or pocket to provide.
From the technical scheme more than the present invention as can be known, owing to adopted the warning device of forming by reflector and receiver, reflector emission high-frequency carrier signal; Receiver is used to receive the high-frequency carrier signal from aforementioned reflector; Once when surpassing setpoint distance and can't receive high-frequency carrier signal because of the spacing of reflector and receiver, this receiver sends buzzing or vibration immediately, fetches mobile phone rapidly to remind the user.
In addition,, do not take any additional space because reflector of the present invention is incorporated into the inside battery of mobile phone, and the cooperating of utilization and receiver, can avoid mobile phone to lose accidentally.
Below in conjunction with drawings and Examples, further the present invention is described in detail:
Fig. 1 is transmitter circuit block diagram of the present invention and the circuit diagram that is incorporated into inside battery.
Fig. 2 is an acceptor circuit block diagram of the present invention.
As shown in Figure 1: reflector 1 of the present invention is battery 2 inside that are installed in mobile phone, by the supply of a switch 22 control power supplys whether and its power supply supply is to provide the required direct voltage of circuit (can be got by the battery dividing potential drop) from battery 2 inner one batteries 21, and establish.Reflector 1 is made up of with antenna 13 oscillator stage 11, amplifying stage 12.When off switch 22 makes the supply direct voltage to reflector 1, can produce default high-frequency carrier signal by oscillator stage 11 and amplifying stage 12, and launch to the external world through antenna 13.The high-frequency carrier signal of launching can be set its specific frequency and wavelength, distance, and its distance can be set to five meters, or sets according to need.
As shown in Figure 2: receiver 3 of the present invention is to be carried on one's body the user, and has independently power supply supply and starting switch.Receiver 3 is made up of with buzzer or vibrating elements 36 antenna 31, amplifying circuit 32, detection voltage-multiplying circuit 33, switching circuit 34, oscillating circuit 35.Wherein, these switching circuit 34 inside comprise two groups of opposed transistor switches, and when one was open circuit, another must be for closed circuit.Oscillating circuit 35 is established an output in addition and is connected an indicating device 37, when power-on is used, and indicating device 37 luminous indications earlier.Receiver 3 is to be exclusively used in the high-frequency carrier signal of reception from reflector 1, when receiver 3 continues to receive from the stable high-frequency carrier signal of reflector 1, detection voltage-multiplying circuit 33 produces cathode voltage, and the first transistor switch that makes switching circuit 34 inside is closed circuit, the transistor seconds switch is open circuit, thereby can not open oscillating circuit 35 and make 36 work of buzzer or vibrating elements.Once surpass setpoint distance (set as described above five meters) in the time of can't receiving high-frequency carrier signal because of the spacing of reflector 1 and receiver 3, mutually to external world the clutter signal a little less than, the voltage that 33 generations of detection voltage-multiplying circuit are extremely weak, and make the first transistor switch of switching circuit 34 inside be open circuit, transistor seconds is closed circuit, then moment starts oscillating circuit 35 work, and makes buzzer or vibrating elements 36 work, and indicating device 37 extinguishes simultaneously.
The present invention has adopted the design of receiver 3 with reflector 1, is battery 2 inside that are incorporated into mobile phone in response to reflector 1, only needs switch 22 is opened when using, and continues externally emission high-frequency carrier signal.And receiver 3 can be provided with clip or retainer, to be tied to user's waist border or pocket.When receiver 3 is opened, and mobile phone and receiver 3 be when remaining in five meters the setting spacing, and receiver 3 continues to receive the high-frequency carrier signals from reflector 1, and indicating device 37 lasting luminous indications.And when the user forget mobile phone in desktop or somewhere and leave surpass five meters apart from the time, receiver sends vibration or buzzing immediately, indicating device 37 extinguishes simultaneously, reaches to remind the user to fetch mobile phone rapidly.
Among the present invention, setpoint distance is not restriction with five meters, and its distance can be decided according to need, only is a preferable set condition, is not in order to limit its scope.
In addition, the battery structure that mobile phone adopted of various brands is also inequality, shows among Fig. 1 that the present invention is incorporated into battery 2 inside with reflector 1, only is an embodiment, and it does not limit the ad hoc structure that the present invention is incorporated into inside battery.