Abstract:
A system and method are provided for displaying electronic devices operable when electrical power is supplied to them at respective operating voltages through respective power connectors. The system has a power supply providing input electrical current at a first voltage and cable structures each connected with the power supply and having a respective power connector electrically connecting with the power receiving structure of one of the electronic devices. The cable structures each include a voltage regulator system that receives the input electrical current, converts it to an output electrical current at an output voltage, and transmits it to the power connector, so as to transmit an operating electrical current to the associated electronic device. The voltage regulator system sets the output voltage of the output electrical current such that the operating electrical current delivered to the associated electronic device has a voltage that corresponds to the operating voltage of that device. This is accomplished by connecting the voltage regulator to a calibrating component with a selected electrical characteristic that sets the output voltage. A security circuit creates an alarm when separation of the electrical device from the system occurs.

Description:
RELATED APPLICATIONS  
       [0001]     This application asserts priority based on U.S. provisional patent application Ser. No. 60/485,263 filed by Opher Pail on Jul. 3, 2003. 
     
    
     FIELD OF THE INVENTION  
       [0002]     This invention relates to the field of displays for electronic devices, and more particularly, to displays that support multiple devices to which electrical power is supplied for permitting consumers to try the equipment operating with electrical power. This invention especially relates to displays of multiple cameras or camcorders that customers in a store can actually use to select the best product to buy.  
       BACKGROUND OF THE INVENTION  
       [0003]     Systems for displaying electronic devices in a store have been devised that supply electrical power to the devices so that a potential buyer can actually pick up and use the electronic device, such as a camcorder or camera, in the store before purchasing it, to select the best model for that particular customer.  
         [0004]     One such system is shown in U.S. Pat. No. 6,386,906 B1 to Burke (herein incorporated by reference). This system is configured to support several different electronic devices made by different manufacturers, which require different power cables and jacks, and often require different voltages. To supply the different voltages, the system has several transformers that convert 110 volt AC current to DC current at three voltages, e.g., 4.5, 7, and 8 volts. Each device is connected to a power supply base by a cable that carries the DC current for all three voltages. At the other end of the cable, an appropriate jack is provided connected to the appropriate conductor of DC for the required voltage of the associated electronic device.  
         [0005]     Systems of the prior art have the disadvantage that they support only devices that can work with the set of voltages provided by the transformers of the base power supply, and updating the system to other different voltage levels for new devices to be displayed requires modification of the circuitry of the base. There are many camcorders on the market, and they have a wide variety of voltages that are required, some being listed below in Table 1. It is not possible to provide such a wide range of possible voltages using systems of the prior art without substantial modifications.  
                               TABLE 1                                       Panasonic PV-DV53D   7.2   v           Panasonic PV-DV353D   6   v           JVC GR-SXM250V   11   v           Canon ZR60A   8.4   v           Sharp VL-NZ50   10   v           Sharp WLAH151   7   v           Olympus C-50   4.8   v           HP 850   6   v           Kodak LS443   5   v           Olympus C-720   6.5   v           Fuji 3800   5   v           Kodak CX4230   3   v           Olympus D-390   3.4   v                      
 
         [0006]     Another drawback of the prior art is that the cable carrying power requires a number of wires, because there are three currents at different voltages, making the power cable heavier and more expensive. Also, the length of the cord can result in a substantial drop in voltage relative to the input voltage, due to resistance in the cable, with the output voltage being less than the input voltage, and possibly outside the proper working voltage range for the associated electronic device.  
       SUMMARY OF THE INVENTION  
       [0007]     It is therefore an object of the invention to provide a system for display of electronic devices to consumers that overcomes the disadvantages of the prior art, especially a system that allows for ready adaptation to electronic devices of any voltage and of any cable configuration.  
         [0008]     It is an object of the invention to provide a system for display of one or more electronic devices. Such a system for displaying a plurality of electronic devices can comprise a power supply providing input electrical current at a first voltage and a plurality of cable structures each being connected with the power supply so as to receive the input electrical current therefrom at the first voltage. Each cable structure has a respective power connector configured to electrically connect with the power receiving structure of a respective one of the electronic devices. The cable structures each also includes a respective voltage regulator system receiving the input electrical current, converting the input electrical current to a respective output electrical current at a respective output voltage, and transmitting the output electrical current to the power connector so as to transmit an operating electrical current to the associated electronic device. The voltage regulator system sets the output voltage of the output electrical current such that the operating electrical current delivered to the associated electronic device has a voltage that corresponds to the operating voltage of the electronic device. It is also an object of the invention to provide a method for displaying one or more electronic devices. Such a method may comprise providing a base module having a power supply with a plurality of electrical connector structures each supplied with DC current at a first voltage, securing to each electronic device a respective device module, and connecting a first cable between each device module and a respective electrical connector structure of the base module so that said first cables each carry said DC current at the first voltage to the associated device module. The device modules each have a respective voltage regulator receiving the DC current and converting the DC current to a respective output current. The method further comprises connecting a second cable between each device module and the electrical device secured thereto. The second cable receives the output current from the device module and transmits the output current to a power connector complementarily engaging and electrically connecting with the power input structure of said electrical device. The output current is transmitted to the electrical device at a voltage corresponding to the operating voltage of said device. Each of the voltage regulators sets the associated output current at a voltage that is dependent on an electrical characteristic of a respective calibrating component connected therewith. The calibrating component is part of the associated second cable connected with the device module.  
         [0009]     It is also an object of the invention to provide a module for attachment to an electronic device on display. A module of this invention may comprise a housing including a securement structure configured to secure the module to the electrical device. A power input is supported on the module and configured to be connected with a power input cable so as to receive therefrom an electrical current having an input voltage. A voltage regulator is supported in said housing and has an input and an output. The input is electrically connected with the power input so as to receive the electrical current therefrom. The voltage regulator is configured to convert the electrical current to an output current at an output voltage and to transmit the output current through the output. The voltage regulator has a calibrating input and is configured to set the output voltage of the output current dependent on an electrical characteristic of a calibrating component connected electrically with the calibrating input. A connector structure is electrically connected with the calibrating input of the voltage regulator. The connector structure is configured to releasably connect with a complementary connection structure so that a user can selectively connect to the voltage regulator a calibrating element having an electrical characteristic to cause the voltage regulator to set the output voltage to an appropriate voltage in view of the operating voltage of the electrical device.  
         [0010]     It is an object of the invention to provide a base module. In a preferred embodiment, the base module comprises a power source transmitting DC electrical current at a first voltage. A plurality of electrical connector structures, each with a plurality of electrical contacts, are configured to connect with a respective complementary electrical connector having a plurality of separate electrical contacts so as to transmit said DC electrical current to the complementary electrical connector to at least one of the contacts. Two of the contacts of the electrical connector structures are connected with an alarm circuit. The alarm circuit detects whether a circuit connected to the two contacts of the electrical connection structure is closed or open. The alarm circuit is configured to initiate an alarm-set condition of the alarm circuit responsive to an initial detection that the circuit connected to the two contacts is closed. The alarm circuit is configured to trigger an audible or visible alarm responsive to a determination during the alarm-set condition that the circuit between the two contacts is open.  
         [0011]     It is an object of the invention to provide a connector cable comprising a first electrical connector element having at least four electrical contacts configured to make four separate electrical connections when the first electrical connector element is secured in engagement with a complementary electrical connector structure. A cable portion has two opposite ends and two wires each connected with a respective one of said electrical contacts of the first electrical connector element. A device power input jack has at least two electrical contacts each connected electrically with a respective wire of the cable portion. The power input jack is configured to be matingly engaged with a power input structure of an electrical device so as to form an electrical connection therewith supplying electrical power to the electrical device at an operating voltage through said power input structure. A calibrating component is connected with two other contacts of the first electrical connector element so that a circuit containing the calibrating component is formed between the two contacts. The calibrating component has an electrical characteristic selected to cause a voltage regulator connected therewith to transmit electrical power at a voltage corresponding to the operating voltage of the electrical device.  
         [0012]     In a particularly preferred embodiment, the connector cable comprises a connector with four contacts, two of the contacts connecting with a calibrating component and at least one of the other contacts connecting with a power supply connector configured to be received in an electronic device so as to supply power thereto.  
         [0013]     It is similarly an object of the invention to provide such a connector cable wherein the calibrating component is adapted to co-act with a voltage regulator so as to cause the regulator to supply current at a first voltage, which voltage is appropriate for powering a device having a power receiving structure that is configured to fit with the power supply connector.  
         [0014]     It is further an object of the invention to provide a system for displaying one or more electronic devices comprising one or more of the above components.  
         [0015]     Other objects and advantages of the invention will become apparent from the disclosure herein. 
     
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0016]      FIG. 1  is a perspective view of a display system according to the invention;  
         [0017]      FIG. 2  is a diagram of a display system according to the invention;  
         [0018]      FIG. 3  is a detail view of the security module attached to the electronic device and the connector cord supplying power therefrom to the device;  
         [0019]      FIG. 4  is a perspective view of a one end of a connector cord according to the invention;  
         [0020]      FIG. 5  is an exploded diagram of a modified alternate arrangement of the system of the invention;  
         [0021]      FIG. 6  is a schematic of the circuitry inside the security module.  
         [0022]      FIG. 7  is a schematic of a connector cord linking the security module to the electronic device on the display.  
         [0023]      FIG. 8  is a schematic of an especially preferred embodiment of the connector cord linking the security module to the electronic device on the display.  
         [0024]      FIG. 9  is a detail view of the securement of a device module to an electronic device being displayed.  
         [0025]      FIG. 10  is a detail view of an alternate embodiment of securement of a device module to an electronic device being displayed. 
     
    
     DETAILED DESCRIPTION  
       [0026]     As best shown in  FIGS. 1 and 2 , an electronic device display is illustrated for displaying to customers one or more electronic devices  3 , which in the preferred embodiments are camcorders or cameras, connected by cable structures to a base module.  
         [0027]     Each camcorder  3  has secured thereto a device module or security circuit housing  5 . The security module  5  has a connection structure or socket receiving the end of a flexible cable  7  that extends through an aperture  9  in a display cover plate  11 , which encloses the display system so that the consumers do not see the power supply or other equipment supporting the display. The cable  7  is preferably a flexible coiled cable, or a cable with a spring loaded take-up reel or recoiler unit  7 A.  
         [0028]     The cable has a distal end  13  with a connection structure that is plugged into one of a number of modular connection structures or sockets  15  in one or more power supply base modules  17 . The base modules  17  are connected to each other by an expansion cord  19 . The first of the base modules  17  is connected by power cable  21  to single voltage power supply  23 , which is in turn connected to a power cable and plug  25  that connects to a wall socket and receives therefrom standard AC current, which in the United States is normally 110 volts. The power supply  23  converts the 110 volt AC to DC at a system operating voltage that is selected to be at least as high as the maximum voltage required to supply any electronic device  3  to be supported on the display. In the preferred embodiment, the DC voltage is 15 volts.  
         [0029]     The DC current flows through cable  21  to the first base module  17 , to a PCB board therein that transmits the DC power to each of the multiple sockets  15 , wired in parallel to share the power. There are preferably 16 to 25 socket outlets  15  in each base module  17 . The expansion cable  19  is also wired in parallel, and transmits the DC current to the next base module  17 , where the DC current is transmitted to the multiple sockets  15  thereof wired in parallel. All sockets  15  in both base modules receive the DC current at the same system operating voltage, e.g., 15 volts.  
         [0030]     Each of the sockets  15  is configured to receive a complementary connection structure or plug therein that is preferably an Ethernet-type jack that securingly clips into the socket  15  and provides six leads or electrical contacts coming from the socket  15 . Two of these leads transmit the DC power at the system operating voltage. Two are preferably ground, and two of the leads connect with wires that are the in and out lines for a security circuit that is closed when the other end of the cable  7  is plugged into the security module  5 , and the security module  5  is secured to the electronic device  3  displayed. If the security module  5  is separated from the device  3 , it breaks the circuit, and if the cable  7  is detached from the security module  5 , or if it is cut to release the device from the display, the security circuit is broken. Generally, the structure securing the security module  5  to the device  3  is a bolt screwed into the device  3 , and the bolt closes the security circuit. If, to separate the device  3  from the security module, this bolt removed, there is an interruption in the circuit, creating an alarm condition.  
         [0031]     An example of such a structure can be seen in  FIG. 5 , which shows an exploded schematic diagram of the system with a molded support for the device  3 , similar to the system of  FIGS. 1 and 2  with similar parts having the same reference characters. Cable  7  extends through opening  9  and through a molded stalk base  29  mounted thereon. Stalk base  29  can supportingly receive thereon tubular stalk upper portion  31 , which has an interior bore through which bolt  33  extends. Bolt  33  goes through security module  5  and bolts into device  3 . Bolt  33  is part of the connection of the wires in cable  7 , and tampering with it breaks the circuit, so as to create an alarm condition  
         [0032]     The PCB circuit in each base module  17  includes a main alarm circuit that illuminates a bi-color LED  26  for each of the sockets  15  selectively for different circuit conditions. During initial setup, the LED  26  for the circuit flashes green. Once a device is correctly plugged into the socket  15 , the alarm circuit detects that the security circuit is completed by sending an alarm sense signal through the security circuit, and the LED is illuminated a steady green, indicating a key-on or alarm-set condition. If there is an unsafe line indication, e.g., the security circuit is not completed, the LED illuminates a steady red.  
         [0033]     Once the security circuit is completed and the LED is lit steady green, the alarm circuit continuously or periodically tests whether the security circuit is closed or open by sending an alarm sense signal through it. If the alarm circuit detects that the security circuit is open, i.e., cut, indicating, for example, that the device  3  has been unplugged or the cable  7  has been cut, it triggers an alarm condition and activates a visible or audible alarm. Preferably, the base module  17  has an audible alarm (preferably a very loud one) that alerts store personnel, and, during the alarm condition, the LED illuminates a flashing red. The alarm can be turned off by an operator control, such as remote  27  ( FIG. 2 ) or key switch  35  ( FIG. 5 ). The base module can also be connected with an auxiliary alarm to enhance the alert, such as by an even louder alarm system or a brighter visible alarm light.  
         [0034]     The base module  17  also has a rechargeable battery power supply that maintains some aspects of the system, e.g., the security alarm, independent of the supply of AC power to the transformer  23 , and any control circuitry, such as the key switch with which an operator can turn the system on or off with a key.  
         [0035]     Referring to  FIG. 2 , security module or device module  5  has an input connection structure or socket receiving the end of cable  7 . This socket is preferably also a six-wire Ethernet-type female socket that matingly receives a complementary connection structure in the form of male Ethernet jack  36  at the end of cable  7  (see  FIG. 3 ). This socket connects the six wires of cable  7  to a PCB circuit board housed in the security module  5 .  
         [0036]      FIG. 6  illustrates the circuit and its functionality. The socket  37  connects with the six wires of cable  7 . Pins  1  and  3  are the positive power input delivering DC current from the base module at the system operating voltage, in the preferred embodiment,  15  volts DC power. Pins  2  and  4  are power ground, or alternatively, the opposing pole of the power of respectively, pins  1  and  3 . Pin  5  is signal ground for the alarm sense signal and a jumper to pin  4  to use as a cable sense. Pin  6  represents the lead receiving the alarm sense signal. Preferably, to minimize noise the cable is organized as three twisted pairs of wires, i.e., pins  1  and  2 , pins  3  and  4 , and pins  5  and  6 .  
         [0037]     Pins  1  and  3  are involved in sending power to the device  3 . DC current at the system DC operating voltage, e.g., 15 volts, flows in and through line  41  to adjustable switching voltage regulator  43 . This voltage regulator  43  converts the voltage in line  41  to the appropriate voltage for the device  3  and transmits the resulting output current through a power output of regulator  43 . The voltage regulator  43  in the preferred embodiment is sold by Micrel, Inc., of 1849 Fortune Drive, San Jose, Calif. 95131 under the designation MIC4684, called the 2A high-efficiency SuperSwitcher™ Buck Regulator.  
         [0038]     Adjustable switching voltage regulator  43  has four lines indicated at  45  that run to a connection structure  47  in the form of standard modular  4 -point telephone jack socket at one end of connector cable  48 . As a more preferable alternative, a USB socket (not shown) may be used instead of a telephone jack, as the USB jack and socket assembly is smaller and reduces the size of the module  5 . This socket  47  receives a complementary connection structure in the form of male 4-point jack  49 , best shown in  FIGS. 3 and 4 . This jack  49  is connected with two two-wire cables  51  and  53 . Cable  51  is preferably 24/26A WG or 24 gauge two-wire cable, and it carries the DC power to a connection structure or jack  55  that is plugged into the power input connection structure or socket generally indicated at  57  of the device  3 . The connection structure or jack  55  is configured to matingly connect with the specific and particular type of connection structure or socket in the device  3 , and is configured to match the power input jack of the particular manufacturer of the device for that device. These jacks vary substantially from manufacturer to manufacturer. Pins  1  and  2  are the power-in (positive voltage) and power-out (negative voltage) lines that send the output DC current from regulator  43  to the device  3 , and these connect with the jack  55  through the two wires or lines  59  and  61  of cable  51 .  
         [0039]     Pins  3  and  4  of the jack  49  connect a calibrating voltage set input of voltage regulator  43  through wire  53  to a regulator calibrating component  63 , which is preferably a resistor, and that co-acts with the regulator  43  to set the voltage level of the DC power output of regulator  43  sent to pins I and  2 . For different values of an electrical characteristic, e.g., resistance of regulator calibrating component  63 , the regulator  43  produces different output voltages. Where the voltage programming component  63  is a resistor, the voltage is low enough that only a minor amount of heat is released. Preferably, the resistor is a ⅛ or ¼ W resistor with an appropriate resistance value, with a 1% tolerance.  
         [0040]     In the preferred embodiment, the connector structure is a male USB jack with a molded body. The calibrating component  63  is supported in the body of the USB jack  49 , preferably embedded in the plastic molding so as to be invisible to the user, and less exposed to damage.  
         [0041]     The connector cable  48  is thus formed of a four-point jack, a calibrating component  63  that sets the appropriate output voltage that the regulator should generate for the specific device  3 , and a power supply line to a jack configured to be received in the power input connection structure  57  of the specific device  3 . The cable is consequently unique to the device  3  or to the set of devices that use the same input structure and voltage, usually a group of products by the same manufacturer. This connector cable is preferably identifiable by a color coded marking, such as tag  65 , or else a coloring of the cables, such as one color indicating a particular voltage and the other the shape of power input jack.  
         [0042]     Another embodiment of the connector cable  48  is seen in  FIG. 8 . In this embodiment, the power input connector structure is preferably an injection-molded plastic structure enclosing the requisite electronic components for connecting to and powering device  3 . In addition, this plastic housing  64  preferably contains the resistor or calibrating component  63  that sets the appropriate output voltage for the device  3  imbedded therein. The four-wire cable is relatively easy to assemble with the components. The plastic housing is preferably configured to resemble the normal manufacturer&#39;s jack for the device, with the component  63  not visible to the consumer testing the product.  
         [0043]     The security module circuit board shown in  FIG. 5  also provides additional security features similar or complementary to those of the base module  17 . Pin  6  is connected to the security circuit portion in the module  5 , and transmits an alarm sense signal along a line to tamper switches  67  that are both closed when the device  3  is secured to the device module  5 . If either tamper switch  67  should open, indicating that the device is somehow separated from the security module  5 , this is detected at the base module, and creates an alarm condition, intended to occur when the device is separated from the security module or the cable  7  to the base module  17  is cut. When the security circuit is broken, the alarm sense line  69  is activated, and microcontroller  71  causes the LED  73  to flash red, and also activates or enables the buzzer alarm circuit  75 , which generates a loud alarm. This alarm is powered by the battery  77 , preferably a 9 volt alkaline battery, whether or not power is being received from the cable  7 .  
         [0044]     The DC power received from cable  7  is also directed to the microcontroller  71  over a power sense line enabling the microcontroller to determine if the module  5  is receiving power from the cable  7 . The DC power is also transmitted through an isolation diode to power the buzzer system  75 , and to a 5 volt voltage regulator, which converts the voltage to 5 volts DC current and uses this to power the integrated circuits and chips of the PCB board in the module  5 .  
         [0045]     The battery  77  is also connected with the 5 volt voltage regulator to power the ICs if the power from cable  7  is interrupted. The power is transmitted-to the 5 volt regulator and buzzer through an isolation diode. A low-battery detection component is also electrically connected with the battery, providing an input to the microcontroller  71  that enables it to alert a user of the need for a recharge or replacement of the battery  77 .  
         [0046]     Microcontroller chip  71  also provides for other control of the LED  75  to show whether power is being received at the circuit from cable  7  (a steady green LED), and whether the battery is low (flashing red with no buzzer).  
         [0047]     With small electrical devices especially, it may be desired to reduce the size of the device module  5  as much as possible. A substantial reduction of size can be achieved by eliminating the alarm circuitry in the device module  5 , i.e., eliminating the alarm sense line  69 , the audible alarm circuit  75 , the buzzer, and the battery  77 . When these are eliminated, if someone detached the electrical device  3  from the module  5  or cuts the wire, or otherwise breaks the security circuit, the alarm circuit of the base module is relied on to serve as the alarm system.  
         [0048]     The securement structure that is preferably used to secure the device module  5  to the electronic device  3  is shown best in  FIG. 9 . The module  5  has a housing  81  that supports the PCB board  83  therein. A cover plate  84  covers the bottom of the housing  81  to restrict access to the interior thereof. The securement assembly comprises a securement member in the form of bolt  85  that is inserted through access opening  86  in cover plate  84 , extends through a washer  87  with a hole in it, through an opening in the PCB board  83 , and through an opening  89  in the housing  83 , where it threadingly engages the device  3  in a threaded aperture  91  therein, which is preferably the threaded aperture provided in video cameras and other electronic devices for functions such as mounting on a tripod or other support.  
         [0049]     Bolt  85  is tightened by a special tool similar to an Allen wrench through opening  86  to firmly secure the module  5  to device  3 . The board  83  is supported fixedly in the position shown by the housing  81 , and, when tightened, the bolt  85  presses against washer  87 , which overlies the two tamper switches  67  on the PCB board  83 . The tamper switches are biased by a spring or other means to the open (circuit broken) state thereof. However, the washer  87  presses on the tamper switches  67  against the urging of the springs, and closes them so as to complete the security circuit.  
         [0050]     If bolt  85  were to be unscrewed from the device by a customer trying to detach the device, it would release pressure on the washer  87 , permitting the tamper switches  67  to open, breaking the circuit, and triggering an alarm condition.  
         [0051]     An alternate embodiment is shown in  FIG. 10 , wherein the module  5  is secured to the device  3  via an adapter  93 . The adapter  93  is configured to be secured to the device  3  by whatever structure or other means necessary, such as adhesive, for example, or by a structural interlock with the device  3 . The configuration of the adapter depends on the configuration of the device  3 . A variety of connection structures can be used advantageously in this area, as will be clear to one of skill in the art. The primary consideration should be that the adapter  93  is very difficult to remove from the device  3 .  
         [0052]     The adapter  93  has a threaded bore  95  therein that screwingly receives bolt  85 . Bolt  85  presses on washer  87  as in the embodiment of  FIG. 9 , closing tamper switches  67 , and closing the security circuit. Any loosening or removal of the bolt  85  from adapter  93  to free the device  3  from module  5  will open the tamper switches  67  and trigger the alarm.  
         [0053]     The terms used herein should be considered terms of description rather than limitation, as those of ordinary skill in the art, having this disclosure before them, will be able to make adjustments and modifications therein without departing from the spirit of the invention.