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WO2004068428A2 - Boitier pour une camera de surveillance sans fil portable pourvue de mecanismes de panoramique et d'inclinaison a faible prix de revient - Google Patents

Boitier pour une camera de surveillance sans fil portable pourvue de mecanismes de panoramique et d'inclinaison a faible prix de revient Download PDF

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Publication number
WO2004068428A2
WO2004068428A2 PCT/IL2004/000024 IL2004000024W WO2004068428A2 WO 2004068428 A2 WO2004068428 A2 WO 2004068428A2 IL 2004000024 W IL2004000024 W IL 2004000024W WO 2004068428 A2 WO2004068428 A2 WO 2004068428A2
Authority
WO
WIPO (PCT)
Prior art keywords
camera
camera device
housing
motor
pan
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/IL2004/000024
Other languages
English (en)
Other versions
WO2004068428A3 (fr
Inventor
Moshe Haiut
Guy Shashua
Shlomi Gadol
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of WO2004068428A2 publication Critical patent/WO2004068428A2/fr
Publication of WO2004068428A3 publication Critical patent/WO2004068428A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/18—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength
    • G08B13/189—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems
    • G08B13/194—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems using image scanning and comparing systems
    • G08B13/196—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems using image scanning and comparing systems using television cameras
    • G08B13/19617—Surveillance camera constructional details
    • G08B13/1963—Arrangements allowing camera rotation to change view, e.g. pivoting camera, pan-tilt and zoom [PTZ]
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/18—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength
    • G08B13/189—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems
    • G08B13/194—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems using image scanning and comparing systems
    • G08B13/196—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems using image scanning and comparing systems using television cameras
    • G08B13/19617—Surveillance camera constructional details
    • G08B13/19632—Camera support structures, e.g. attachment means, poles

Definitions

  • This invention relates to wireless surveillance cameras in general, and more specifically, to a method and mechanical apparatus for remotely controlling the pan and tilt angles of a small wireless surveillance camera.
  • a typical remotely controlled surveillance camera is usually mounted on a fixed mounting device.
  • the mounting device usually contains one or more motors combined with a gear system that can rotate the camera horizontally and vertically to produce the pan and tilt motions.
  • the camera core and the monitoring system are so expensive, that system designers can afford to incorporate in it high cost electro- mechanic systems with servo motors or stepper motors without increasing the total cost of the whole system too much.
  • the present invention has been made in consideration with this situation.
  • the object of the present invention is to provide an inexpensive method and apparatus for creating remotely controlled pan and tilt motions for low-cost surveillance cameras which is easy to install and simple to operate.
  • a surveillance camera device which rotates around its axis.
  • Said camera housing comprised of a concaved shaped housing; at least one optical sensor and lens located on the surface of said housing; a motor located within said housing wherein the motor stator is attached to said housing and the rotor axis is connected to a free momentum wheel; a designated electrical circuit for controlling the movement of said motor; and a battery.
  • the camera's pan motion is a result of the motor momentum wheel movement.
  • the camera's motion is controlled by wireless means.
  • the camera's tilt motion is a result of a shift in the center of gravity of the camera housing by changing the position of a weight along the device's horizontal axis.
  • the tilt motion may be functioned manually or controlled by a second motor and activated through the wireless means.
  • the camera device may be positioned on a flat surface having a minimal friction between camera device and the surface, or hanged on a supporting arm by an anchor of a concaved shape which is attached at the top-end of the device wherein a minimal friction is maintained between the anchor and the supporting arm.
  • Live video or still pictures captured by the camera are transmitted by wireless means.
  • Still pictures may also be stored on the camera's local memory.
  • the camera operates according to low power consumption principles and therefore it maintains in a hibernating state unless activated by the user. Activation may be direct user activation, preprogrammed automatic activation according to schedule or as a response to audio or visual stimuli from its surroundings.
  • FIG. 1 is an implementation example of a small wireless camera, which incorporates inventive pan and tilt mechanisms;
  • FIG. 2 illustrates the Resting Position mode of operation of the implementation example device of FIG. 1, in accordance with the preferred embodiment of the present invention;
  • FIG. 3 illustrates the Hanging Position mode of operation of the implementation example device of FIG. 1, in accordance with the preferred embodiment of the present invention
  • FIG. 4 describes the principle of operation of the remote controlled pan functionality of the implementation example device of FIG. 1, in accordance with the preferred embodiment of the present invention
  • FIG. 5 describes the principle of operation of the manual tilt functionality of the implementation example device of FIG. 1 , in accordance with the preferred embodiment of the present invention
  • FIG. 6 describes the principle of operation of the remote tilt mechanism of the implementation example device of FIG. 1, in accordance with the preferred embodiment of the present invention
  • FIG 7 illustrates the implementation example device of FIG. 1 means of communication and data transference.
  • FIG 8 is an illustration of a block diagram of the required hardware modules in the preferred embodiment of the invention.
  • the present invention provides an inexpensive solution for a remotely controlled surveillance camera. It enables the user to fully control the pan and tilt motions of the camera through wireless means, to watch the captured images at a remote location in realtime and to preprogram the camera to operate at set times and/or according to events in its surroundings.
  • FIG. 1 illustrates an example for the preferred embodiment of the present invention, showing housing of a camera and its pan and tilt mechanisms.
  • the ball shaped camera housing 4 encompasses the entire system.
  • the system comprises the optics device 13, the electronic circuits 7, the electro-mechanical parts 1-3 and a source of energy 8.
  • the optics device 13 consists of a lens 5, a Complementary Metal-Oxide Semiconductor (CMOS) Sensor 6, and the electronic Printed Circuit Board (PCB) 7, which is fed via two wires 9 from a battery pack 8.
  • CMOS Complementary Metal-Oxide Semiconductor
  • PCB Electronic Printed Circuit Board
  • the pan mechanism consists of a DC Motor whose stator 1 is fixed to the camera housing, and whose rotor axis 2 is connected to a free momentum wheel 3.
  • the motor is fed by the PCB 7 via the wires 10.
  • the camera housing may include an anchor mechanism A on its top edge as is illustrated in Figure 1A.
  • the anchor 31 is fixed to the camera housing 4, and its top edge 32 is concave shaped.
  • This embodiment includes a manually operated tilt mechanism B, which is fixed to the housing body 4 in the opposite extremity of the position of the optic device 13.
  • This mechanism which is specified in figure IB, consists of a screwing axis 12 and a screw nut 11.
  • This manual tilt mechanism can be replaced by a remote controlled motorized solution, which is another embodiment of the present invention that is illustrated in figure 6 and is described below.
  • the camber shaping of the camera housing and the anchor A in its top edge allow for two different mounting positions: a resting position (illustrated in FIG. 2), and a hanging position (illustrated in FIG. 3). In both mounting positions a minimum amount of friction is produced in the area holding the weight of the device. This enables free angular motions of the whole housing in both horizontal and vertical directions.
  • a resting position illustrated in FIG. 2
  • a hanging position illustrated in both mounting positions.
  • a minimum amount of friction is produced in the area holding the weight of the device. This enables free angular motions of the whole housing in both horizontal and vertical directions.
  • Fig.2 the camera rests on a table 40 (the table - or any other type of a flat surface - is not a part of the invention). Provided that it has a solid surface, the camera housing 4 touches the table 40 in a close to zero tangential contact area 42.
  • FIG. 3 depicts an example of a hanging position of the camera.
  • the camera is hung by its anchor on a special ami 52 that is fixed to the wall.
  • the anchor A touches the arm in a close to zero contact area.
  • the low center of gravity of the camera device keeps it stable in this hanging position, and the small area of contact produces minimum friction. Both the resting position and the hanging position allow for the camera device to perform movements in the pan and tilt directions.
  • the said camera housing can also differ from the embodiment illustrated in FIG. 1.
  • the camera housing need not be shaped as a ball; any ellipsoid shape may be used, as long as its contact area with the surface produces minimum friction.
  • Another possibility is to have the device built within a gyroscope frame construction wherein the device is free to rotate at any axis.
  • FIG. 4 The principle of the pan mechanism, based on the torque angular force, is illustrated in FIG. 4.
  • the motor starts to rotate the momentum wheel 3 anti clockwise 63. While the momentum wheel accelerates on its axis a torque is developed between the stator 1 and the rotor of the motor. Since the stator 1 is fixed to the camera housing 4, and because the friction of the housing's contact point with the surface 43 is less than a given threshold, the said torque causes the whole camera housing 4 to rotate clockwise 64. As the housing 4 rotates clockwise, the lense 5, which is positioned on the horizontal circumference of the housing, pans to the right. Similarly, a pan rotation to the left is achieved when the motor accelerates the momentum wheel 3 clockwise.
  • the said dynamics occurs only while the momentum wheel 3 accelerates; once the wheel reaches its maximum angular velocity, the stator torque over the camera housing drops to zero (this is because the torque is outweighed by the friction in the motor axis).
  • the angular velocity of the momentum wheel 3 needs to be reduced, and then reaccelerated.
  • the embodiment of the pan mechanism may differ from the one illustrated in FIG. 4. Since the technique described above produces a non-continuous pan motion, the system may apply a train of energy pulses to the motor, to achieve a burst-like motion. In this case the pulses are only given to the motor for short time spans.
  • the duration of the pulses is designed so that power is provided to the motor only at the time span during which the rotor and the momentum wheel 3 are accelerating and is stopped once they reach their maximum velocity.
  • the pulses of energy can be produced by a dedicated electronic circuit, and their timing may be determined by the local circuit or controlled by the camera's remote system.
  • the period and duty-cycle of the power pulses must be designed to fit the physical features of the system's elements.
  • the produced torque should be sufficient to overweight the friction of the device at the point of contact 42 with the surface.
  • the time span between every two consecutive pulses must be long enough for the rotor to reduce speed. The speed reduction is caused by the rotor's friction.
  • the momentum wheel's deceleration produces a negative torque, this causes the device to deduce speed and even to stop.
  • this negative torque might cause the device to start turning back in the opposite direction. It is therefore important that the coefficient of the static friction should be big enough to prevent movement in the opposite direction while the rotor is reducing speed.
  • the train of pulses continues until the camera 13 points at the desired angle. The pulses will stop on command by the user via the means of control. This system enables the device 4 to make undisturbed full 360 degrees pan rotations in both directions.
  • the embodiment of the inventive pan mechanism can differ from the example of FIG. 1 and FIG. 4 in various ways.
  • the momentum wheel 3 may be of different sizes, weights, and shapes in relation to the camera housing 4 and the motor size.
  • the momentum wheel 3 may be waived altogether if the momentum of the rotor and motor axis is substantial enough in proportion to the total structure of the device and can create the needed torque.
  • the motor axis 2 is left free, while the motor body 1 is attached to the camera housing 4.
  • the stator of the motor 1 may alternatively be fixed to any part of the camera housing 4, mounted on the PCB 7, or fastened to other internal parts of the camera which are attached to the camera housing 4. There is no requirement that it will be attached to the top side of the housing as it is portrayed in the figures. It is important that the axis of the motor 2 should be perpendicular to the desired pan rotating axis 64 of the camera housing 4.
  • the preferred embodiment comprises a low-cost DC motor to keep the total cost of the device at a minimum. But there is no requirement that it must be a DC motor, it can be a stepper motor, or any type of electric motor.
  • the principles operating the tilt mechanism are based on the center of gravity laws, as illustrated in FIG. 5.
  • the location of the screw-nut 11 on the screwing axis 12 in the rear part of the camera housing shifts the center of gravity of the whole camera.
  • Tilt up is achieved by screwing-out the screw-nut towards the rear edge of the screwing axis 61.
  • This change in the position of the nut 11 on the screw 12 shifts back the center of gravity of the camera housing 4, and tilts-up the optical axis 62 in relation to the horizontal axis 60.
  • tilt down is achieved by screwing-in the screw-nut 11 towards the camera housing 66.
  • the change in the screw-nut position shifts forward the center of gravity of the camera housing 4, which results in tilting-down the optical axis 65 in relation to the horizontal axis 60.
  • the tilt mechanism embodiment can differ from the examples in FIG. 1 and FIG. 5 in various ways.
  • the screwing-in and screwing-out of the screwing-nut may be operated manually or remotely controlled.
  • a motor can be used to change the location of the weight that comprises a screw-nut.
  • FIG. 6 One such solution is illustrated in FIG. 6.
  • a DC motor 23 has a screwing axis 24, and can move a weight 25 back and forth and shift the device's center of gravity.
  • Other solutions of having an electric motor controlling the movement of a weight back and forth shifting the center of gravity are acceptable.
  • the location of the moving weight can be anywhere inside or outside the camera housing, as long as its moving path is aligned with the optical axis 60 and that its movement shifts the center of gravity of the device.
  • FIG 7 illustrates the camera device's means of control and communication.
  • the device 4 establishes a bidirectional wireless communication connection 71 with a wireless transmitter 72.
  • the wireless communication protocol may be any of the protocols known in the art such as, but not limited to infrared, Bluetooth, radio transitions or cellular communications.
  • the wireless transmitter 72 may then, in turn, establish a permanent or an ad hook means of communication with any electronic controlling device which may process commands and display visual images, such as a PC computer 75, a PDA 76 or a cellular phone 77.
  • the communication between the wireless transmitter 72 and the controlling device 75-77 may be direct, via the Internet 73 or the cellular network 74.
  • the controlling device 75-77 may operate the movement of the camera housing 4, receive the images captured by the camera, control the camera's operation (turn on and off, capture video images or take still pictures) and program its preferences.
  • the camera's preference may be programmed to operate only on command from the user, set to automatically operate according to a schedule or as a response to audio or visual stimuli from its surroundings.
  • the system integrates a low-power consumption feature which ensures that the battery pack, which is the energy source of the device, does not demand frequent battery replacements.
  • the low-power consumption is achieved by having the device operate only on command. Unless ordered otherwise the device is motionless and the camera is hibernating in sleep mode. Having terminated the communication with the user or having completed the programmed task the camera returns to sleep mode.
  • FIG. 8 illustrates the said surveillance camera device as containing a lens 5, with an image sensor 6.
  • the data that is produced by the image sensor 6 is processed by the Image Processor unit 83, which sends its output digital video data to the Wireless Communicator unit 85.
  • the digital video data can be plain video data or in compressed video format, depending on the capabilities of the Image Processor 83.
  • the Wireless Communicator unit 85 consists of a Wireless Protocol Handler 86, a Wireless Modem 87, and a Wireless Radio Transceiver 88.
  • the Wireless Communicator 85 can also receive user commands from the wireless network, and transfer these commands to the Control unit 84.
  • the Control unit 84 receives and performs the user commands, and sends acknowledges - when required - back via the Wireless Communicator unit 85.
  • the Control unit 44 continuously controls the Image Processor 83, to synchronize bit rates and to manage image quality.
  • the Control unit 84 may also capture a still picture and store it in the Still Picture Storage unit 81.
  • the Control unit 84 can drive the pan and tilt Mechanism 82 to change the directional view of the camera.
  • the device may also include a small microphone 91 that is used for capturing sound events and a battery pack 90 containing either rechargeable or non- rechargeable batteries.
  • the device described aforementioned may be used for remotely controlled pan and tilt movement mechanisms in devices that are not a camera, or that are not used as cameras.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Studio Devices (AREA)
  • Accessories Of Cameras (AREA)

Abstract

L'invention concerne un boîtier pour une petite caméra de surveillance sans fil fonctionnant avec un procédé de commande de mécanismes de panoramique et d'inclinaison simple et à faible prix de revient. Ce boîtier est un élément fermé contenant un ou plusieurs moteurs. Les mécanismes de panoramique et d'inclinaison permettent à l'utilisateur de déplacer le boîtier dans des directions appropriées au moyen d'une télécommande sans fil. Pour effectuer le mouvement panoramique, on fait tourner le boîtier autour de son point de contact en utilisant la loi mécanique du couple que crée l'accélération angulaire. Pour effectuer le mouvement d'inclinaison, on change la position du centre de gravité, en le déplaçant vers l'arrière ou vers l'avant respectivement. Grâce à ces deux lois fondamentales de la mécanique, on peut faire tourner le petit boîtier de caméra lentement et par étapes courtes, jusqu'à ce qu'il atteigne le point de vue souhaité. Deux positions de montage possibles sont envisagées : le boîtier de caméra est soit placé sur une surface plate, soit suspendu à un point d'ancrage.
PCT/IL2004/000024 2003-01-28 2004-01-11 Boitier pour une camera de surveillance sans fil portable pourvue de mecanismes de panoramique et d'inclinaison a faible prix de revient Ceased WO2004068428A2 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US44275203P 2003-01-28 2003-01-28
US44275103P 2003-01-28 2003-01-28
US60/442,752 2003-01-28
US60/442,751 2003-01-28

Publications (2)

Publication Number Publication Date
WO2004068428A2 true WO2004068428A2 (fr) 2004-08-12
WO2004068428A3 WO2004068428A3 (fr) 2004-11-18

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PCT/IL2004/000024 Ceased WO2004068428A2 (fr) 2003-01-28 2004-01-11 Boitier pour une camera de surveillance sans fil portable pourvue de mecanismes de panoramique et d'inclinaison a faible prix de revient

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WO (1) WO2004068428A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108137167A (zh) * 2015-09-11 2018-06-08 深圳市大疆创新科技有限公司 拍摄设备及无人机

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4320949A (en) * 1976-03-03 1982-03-23 Pagano Raymond V Weatherized housing assembly for camera
US4788596A (en) * 1985-04-26 1988-11-29 Canon Kabushiki Kaisha Image stabilizing device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108137167A (zh) * 2015-09-11 2018-06-08 深圳市大疆创新科技有限公司 拍摄设备及无人机

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Publication number Publication date
WO2004068428A3 (fr) 2004-11-18

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