Abstract:
A movable security camera apparatus for providing visual security with minimal human effort, error and equipment expense, includes a MICOM, a path input section, a sensing section, a sensor detecting section, a camera video tape recording section, and a main driving section. The MICOM controls the whole system, including the motion of a watch camera on the basis of control programs in accordance with inputted path information. The sensing section provides the data for the moving direction of the camera, the data being obtained when sensors of a rail are controlled by the path commands of the MICOM.

Description:
FIELD OF THE INVENTION 
     The present invention relates to a movable security camera apparatus, and more particularly to, a camera apparatus in which a series of control programs control a video camera recorder so as to move it automatically along a rail of a certain track contour and to perform photographings, and a series of the photographings are recorded, thereby making it possible to guard a certain area with a single camera. 
     BACKGROUND OF THE INVENTION 
     Generally, many public facilities such as banks, department stores and prisons are guarded by patrolling cars at intervals of certain periods. However, such a guarding method is not efficient enough to prevent or detect crimes and other accidents. 
     Such a guarding method depends on human efforts and, therefore, the carelessness and mistakes of the patrolling persons can fail to notice a problem. Thus, an intruder who well knows the situation of the watched area can escape the detection of the patrolling persons. Consequently, many accidents are still generated and the loss of property occurs. 
     In order to overcome the above described problems of the human watch method, a recently developed new guarding and security system includes a closed circuit provided with a camera or the like for detecting objects plus a monitor capable of displaying the watched area to allow quick warning and action following an accident such as a fire, or an intrusion. 
     However, such a guarding system requires a large number of cameras to be installed at critical places in the watched area to the need for such a large number of cameras increases the cost of the guarding system. Cost is also increased by, expensive recording apparatus and a plurality of video tapes for recording the data photographed by the watching cameras. 
     SUMMARY OF THE INVENTION 
     The present invention is intended to overcome the above described disadvantages of the conventional apparatus. 
     Therefore, it is the object of the present invention to provide a movable security camera in which a control program controls a single or small number of cameras so as to automatically move them along a rail track, thereby making it possible to guard a whole area. 
     In achieving the above object, the movable security camera apparatus according to the present invention comprises a MICOM (microcomputer) for controlling the apparatus including the motion of a security camera on the basis of a control program in response to an input path information, a path input section for inputting the moving path information for the security camera to the MICOM, a sensing section for selectively turning on or off respective sensors disposed on a rail according to the path commands from the MICOM, a sensor detecting section for detecting the moving path of the security camera by sensing the states of the sensors of the sensing section, a camera VCR (Video Cassette tape Recording) section including a security camera for photographing the guarding area by moving through the area along the rail according to the path commands from the MICOM and a VCR for recording intermittently or continuously the photographed information of the security camera, and a main driving section for supplying a driving power to the camera VCR section and for driving and shifting the moving direction of the security camera according to the output of the sensor detecting section. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     The above object and other advantages of the present invention will become more apparent from the description of the preferred embodiment of the present invention with reference to the attached drawings in which: 
     FIG. 1 is a block diagram showing the constitution of the movable security camera apparatus according to the present invention; 
     FIG. 2 illustrates the constitutions of the rail and video camera recorder of the movable security camera apparatus according to the present invention; 
     FIG. 3 illustrates the installation of the rail of the movable security camera apparatus according to the present invention; 
     FIG. 4 is a flow chart showing the operation of the movable security camera apparatus according to the present invention; and 
     FIG. 5 is a flow chart showing the operation of the recording mode in FIG. 4. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENT 
     FIG. 1 is a block diagram showing the constitution of the movable security camera apparatus according to the present invention. As shown in FIG. 1a MICOM 10 controls the whole system on the basis of control programs, and the output terminal of a path inputting section 20 which inputs moving paths of the camera is connected to the MICOM 10. The MICOM 10 is connected to a sensing section 30, and the sensing section 30 turns on or off a plurality of sensors 31 which are installed at certain intervals on the rail. 
     The outputs of the sensing section 30 are detected by a sensor detecting section 40, and the outputs of the sensor detecting section 40 are supplied to a main driving section 50 for driving a motor. The main driving section 50 turns on or off a camera VCR section 60. The camera VCR section 50 records the photographed data for the area to be guarded. The main driving section 50 drives the camera VCR section 60 and a motor for moving the camera in the forward or reverse direction. 
     FIG. 2 illustrates an embodiment of the mechanism of the movable security camera apparatus according to the present invention. As shown in FIG. 2, a mounting pole 52 for the security camera (video camera recorder) 51 is provided with sensor detecting means which is installed at the lower part thereof thereby forming the sensor detecting section 40 as shown in FIG. 1. 
     Further, sensors 31 of the sensing section 30 are installed on the inner bottom of a rail 70 in such a manner that the sensors 31 and the sensor detecting section 40 of the mounting pole 52 should face each other. Further, a plurality of driving gears 53 are installed on the lower part of the mounting pole 52, and spur gears 71 are formed on the opposite sides of the rail 70 so as to be meshed with the driving gears 53, thereby moving the driving gears 53 along with the spur gears 71 of the rail 70. 
     FIG. 3 illustrates such an installed state of the rail 70. As shown in FIG. 3, a plurality of sensors 31 are respectively installed between points a-h. 
     In the case where such a track is adopted, the moving paths for the watch camera 51 can be varied as follows. 
     
         ______________________________________Path 1:         points a-b-c-d-e-aPath 2:         points a-e-f-e-d-g-h . . .Path N:         points a-b-c-d-g-h-g-d-c-b-a______________________________________ 
    
     Therefore, the moving paths for the watch camera 1, 2, 3, . . . N are selectively inputted into the MICOM 10 and, thus, the paths for the security camera 51 are succeeded in accordance with the sequence of the programs of the MICOM 10. 
     The camera apparatus of the present invention constituted as above will now be described as to its operations and effects referring to FIG. 4. 
     At the start, the MICOM 10 decides as to whether there is an input for the path from the path input section 20 (step 110) so that in the absence of such an input, the camera 51 is led to its usual moving loop which is set in advance (step 120). On the other hand, in the presence of such an input, the input of the path input section 20 applied to the MICOM 10 (step 130) so that the MICOM 10 controls the sensing section 30 according to the input so as to turn on or off the sensors 31 installed on the rail 70 respectively and to move the watch camera 51 along the inputted path (step 140). 
     Thereafter, the MICOM 10 drives the main driving section 50, so that the camera VCR section 60 is turned on, and that the watch camera 51 is activated photograph. At the same time, the motor is driven so as to move the security camera 51 (step 150), and the data photographed by the security camera 51 is recorded by its VCR section (step 160). As shown in FIG. 2, the security camera 51 moves along the rail 70 by a plurality of the driving gears 53 which are driven by a motor (not shown) and meshed with the spur gear 71 formed on the rail 70. 
     Under this condition, whether the security camera 51 should continuously move or should change the track is decided in accordance with the states of the sensors 31 installed on the rail 70, i.e., the turned on or off states of the sensors 31. The states of the sensors 31 are controlled by the MICOM 10 in accordance with the path information inputted from the path input section 20. 
     Further, when the security camera 51 passes the sensors 31, if the mounting pole 52 of the camera is positioned vertically upon the sensors 31, the sensor detecting section 40 installed on the lower part of the mounting pole 52 generates a sensing signal to read a track changing signal. Then the main driving section 50 drives the motor in the forward or reverse direction for adjusting the moving direction of the security camera 51. 
     In that case, the sensor detecting means utilizes a F/V converter (frequency-to-voltage converter) to make the respective sensor 31 of the sensing section 30 generate commands for straight advancement, left and right turns and reverse advancement in different frequencies. At the same time, the sensor detecting section 40 detects the frequencies outputted from the sensors 31, and supplies them as data for the motion of the camera. 
     Furthermore, when the camera comes to the position directly above a sensor 31 which generates direction changing signals, the signals are detected by means of a proximity switch. Some other techniques which are not described in the present invention might be used. 
     Thus, the security camera 51 moves along the inputted moving paths, takes photographs, and records the photographed data, until arriving at the end of the rail 70, where a discrimination is made as to whether the camera 51 has arrived at the end of the rail (step 170), and then the movement of the security camera 51 is reversed in the opposite direction (step 180). 
     If the discrimination shows that it has not arrived at the end of the rail 70 yet, the security camera 51 continuously moves and, thereafter, the discrimination is made again as to whether it has arrived at the end of the path (step 190). If it is not the end of the path, a return to the step 170 is made, while, if it is the end of the path, a return is made to the step 110 where a discrimination is made as to whether a new path is to be inputted. 
     According to the result of the discrimination, if there is no new path input the preset normal state (step 120) is restored, and if there is a new path input, then the steps from 130 to 190 are repeated. 
     Meanwhile, the normal state can be selectively set by the user, for example, one of the above mentioned paths is carried out or the driving of the whole system can be terminated in the normal state. 
     Thus, if the moving paths for the watch camera 51 are set by the path input section 20 in advance, the security camera 51 moves to carry out the steps successively in accordance with the sequence of the inputted paths (inputted into the MICOM 10) and, therefore, it becomes impossible for a third party to predict the moving direction of the camera. 
     Moreover, in the case where the guarding area is very extensive, the recording can be carried out intermittently at a predetermined interval during the movement of the security camera, so that then the consumption of the recording tape can be saved. 
     If the recordings are intermittenly made, the recording-on and recording-off times should be set at the step 160 under the recording mode as shown in FIG. 4. 
     That is, in setting the recording times as shown in FIG. 5, the recording on-and-off times are set (step 161), and the recording mode is turned on to record the photographed data of the watch camera 51 on the tape (step 162). Then a discrimination is made as to whether the recording-on time has elapsed off (step 163). If it is found that the recording-on time has not been elapsed yet, then the mode of recording-on is maintained further while checking the elapse thereof. 
     If the recording-on time has elapsed off, the recording mode is turned off (step 164), so that the photographed data of the security camera 51 is not be recorded any more and the user can guard only through the monitor. 
     According to the present invention as described above, the security camera moves along the rail of a predetermined track contour to extensively watch the area to be guarded. Further, the moving paths for the security camera for taking the photographs are variously provided so that all the corners of the place to be guarded can be watched without omissions, and that more important places can be more frequently watched by adjusting the paths. 
     Accordingly, the present invention eliminates the waste of the human efforts in comparison with the case of alternate patrollings by the patrolling guards at a certain interval, and even a wide area can be guarded efficiently by means of a single camera or a small number of cameras, thereby the apparatus being economically operated. 
     Also, the guarding errors due to the carelessness and mistakes of the patrols can be prevented sufficiently. Furthermore, if the watch camera is provided to pivot left and right, then the watch is not limited to one direction during the movement of the security camera, but extended to all directions, thereby doubling the guarding effect.