Abstract:
A rotatable camera comprises a camera and a fixing seat, wherein the camera and the fixing seat are assembled respectively with a coil for electrical conduction, such that after the camera and the fixing seat are assembled, an electric conduction can be accomplished by the coils, allowing the camera to rotate by 360 degrees without having interference points, so as to achieve a function of monitoring without having blind angles.

Description:
BACKGROUND OF THE INVENTION 
       [0001]    a) Field of the Invention 
         [0002]    The present invention relates to a rotatable camera, and more particularly to a rotatable camera that is set up in a site for surveillance, and can rotate by 360 degrees without having interference points. 
         [0003]    b) Description of the Prior Art 
         [0004]    A camera is a very popular electronic device. In some circumstances, the camera would have functions of moving upward and downward, and of rotating left and right. For the rotatable cameras, the most difficult problem to be overcome is to rotate the cameras by 360 degrees without having interference points. Since there are at least one signal line and one power line need to be passed through a bottom seat of the camera, if the bottom seat of the camera rotates by 360 degrees continuously, then the signal line and the power line will be inevitably twisted off. For this reason, some entry level cameras just simply set up to rotate back and forth within a certain fixed angle limit, and some other more advanced cameras use slip ring to achieve zero interference points. Referring to  FIG. 1 , it shows a schematic view of a conventional slip ring, wherein a slip ring structure  10  includes a body  101  and a wiring  102 , allowing the camera to rotate by 360 degrees continuously. However, this kind of slip ring structure is very expensive. Therefore, only small numbers of cameras are equipped with this device and prohibiting the camera from fully developing its monitoring function. 
       SUMMARY OF THE INVENTION 
       [0005]    Accordingly, the primary object of the present invention is to provide a camera that can rotate by 360 degrees without having the interference points, to meet a requirement of no blind angles in setting up the camera. The present invention applies a principle of electromagnetic induction to transmit electricity by coils, without requiring the power line to pass through the bottom of the camera. In addition, in terms of signal transmission, a wireless transmission method is used to remove the signal line, thereby allowing the camera to rotate without having interference points. 
         [0006]    Accordingly, the rotatable camera provided by the present invention is constituted by a camera and a fixing seat. The camera is provided with a rotation mechanism and a first coil, and the fixing seat includes a second coil which is coupled with a transmission line. After the rotation mechanism is assembled with the fixing seat, the camera can rotate on the fixing seat. Moreover, the first coil is coupled with the camera, and the second coil is coupled with the transmission line. By using the first coil and the second coil, electricity can be conducted to the camera from the fixing seat, allowing the camera to operate electrically and to rotate by 360 degrees, thereby achieving an application requirement of monitoring without having the blind angles. 
         [0007]    To enable further understanding of the said objectives and the technological methods of the invention herein, the brief description of the drawings below is followed by the detailed description of the preferred embodiments. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0008]      FIG. 1  shows a schematic view of a conventional slip ring structure. 
           [0009]      FIG. 2  shows a perspective view of the present invention. 
           [0010]      FIG. 3  shows a cutaway view of the present invention. 
           [0011]      FIG. 4  shows a schematic view of an operation of the present invention. 
           [0012]      FIG. 5  shows a schematic view of elements of the present invention. 
       
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
       [0013]    Referring to  FIG. 2 , a rotatable camera  20  disclosed by the present invention comprises primarily a camera  201  and a fixing seat  202 , wherein the camera  201  includes an image module  2013  for capturing dynamic or static images. A bottom of the camera  201  is assembled with a rotation mechanism  2011  which is provided with a first coil  2012 . As shown in the drawing, the fixing seat  202  is provided with a second coil  2021  which is connected with a transmission line  2022 . The transmission line  2022  can transmit electricity. In addition, a rotating shaft  203  is movably assembled between the first coil  2012  and the second coil  2021 , and is therefore pivoted after being assembled. The first coil  2012  and the second coil  2021  can rotate with respect to each other, and electricity is transmitted by the coils by using a principle of electromagnetic induction, such that there is no need to pass a power line through the bottom of the camera  201 . Furthermore, the aforementioned first coil  2012  and second coil  2021  are made by metallic wires, and their surfaces are enclosed by an insulating material. For the rotatable camera  20  of the present invention, power is transmitted to the camera  201  by the first coil  2012  and the second coil  2021 . The camera  201  is further provided with a wireless communication unit (not shown in the drawing) and a wireless receiving device  2014  by which the camera  201  can conduct a wireless communication with an external device (such as a wireless network base station). As this part belongs to an application of a conventional microprocessor system and communication technology, no further description is needed. In other words, by applying the principle of electromagnetics, and through secondary coils for transmitting electricity, the power is provided to the camera  201  by the fixing seat  202  without contacting. Accordingly, as electricity can be transmitted to the camera  201  from the fixing seat  202 , there will be no wirings existed between the camera  201  and the fixing seat  202 , and hence there is no interference point, allowing the camera  201  to rotate by 360 degrees without any limitation. 
         [0014]      FIG. 3  and  FIG. 4  show respectively a cutaway view and a schematic view of an operation of the present invention. As shown in  FIG. 3 , the first coil  2012  at the bottom of the camera  201  is assembled relative to the second coil  2021  of the fixing seat  202  by a rotating shaft  203 . After assembling, the two coils can rotate with respect to each other by the rotating shaft  203 . Moreover, as the second coil  2021  is connected with the transmission line  2022 , electricity can be introduced through the transmission line  2022 ; and by using the principle of electromagnetic induction, even when the first coil  2012  is rotating, it can still continuously receive the electricity from the second coil  2021 . Therefore, even the camera  201  has rotated by 360 degrees; it is still not interfered by any wiring or device, and the visual angle of monitoring of the camera can be largely increased.  FIG. 4  shows a schematic view of an operation of the camera  201 . 
         [0015]    Referring to  FIG. 5 , an embodiment of the rotation mechanism  2011  can be an I-shape rotating shaft  203 ′ (or the rotating shaft  203  in the original embodiment). As shown in the drawing, the rotation mechanism  2011  and the fixing seat  202  are assembled by this I-shape rotating shaft  203 ′. An upper section  2031 ′ of the I-shape rotating shaft  203 ′ is assembled at a bottom end of the camera  201 , and a lower section  2032 ′ is assembled at the fixing seat  202 . On the other hand, the upper section  2031 ′ of the I-shape rotating shaft  203 ′ is serially connected with the first coil  2012 , and the lower section  2032 ′ of the I-shape rotating shaft  203 ′ is serially connected with the second coil  2021 . In addition, the first coil  2012  and the second coil  2021  are constituted by enameled copper wires. 
         [0016]    Accordingly, the present invention provides a rotatable camera, wherein electricity is transmitted by electromagnetic induction, allowing no wires passing through a bottom seat of the camera, and hence enabling the camera to be free from affection by interference points, thereby resulting in rotation by 360 degrees continuously. On the other hand, as materials used by the present invention are all electronic elements which are commonly used in electronics industries, the present invention will have a low price, which apparently can effectively solve a shortcoming of high price for the conventional solution, and therefore facilitate a full population of camera technology of 360 degrees of rotation and without having the interference points. Accordingly, after being implemented, the present invention can truly provide a camera which is free from the interference points, and can rotate by 360 degrees continuously, thereby meeting a requirement of setting up the camera without having blind angles. 
         [0017]    It is of course to be understood that the embodiments described herein is merely illustrative of the principles of the invention and that a wide variety of modifications thereto may be effected by persons skilled in the art without departing from the spirit and scope of the invention as set forth in the following claims.