EP2402968B1 - Umlenksteg für eine Tastaturanordnung - Google Patents

Umlenksteg für eine Tastaturanordnung Download PDF

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Publication number
EP2402968B1
EP2402968B1 EP20100167824 EP10167824A EP2402968B1 EP 2402968 B1 EP2402968 B1 EP 2402968B1 EP 20100167824 EP20100167824 EP 20100167824 EP 10167824 A EP10167824 A EP 10167824A EP 2402968 B1 EP2402968 B1 EP 2402968B1
Authority
EP
European Patent Office
Prior art keywords
actuator
flange
keypad assembly
keypad
key
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.)
Active
Application number
EP20100167824
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English (en)
French (fr)
Other versions
EP2402968A1 (de
Inventor
Chao Chen
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.)
BlackBerry Ltd
Original Assignee
BlackBerry Ltd
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 BlackBerry Ltd filed Critical BlackBerry Ltd
Priority to EP20100167824 priority Critical patent/EP2402968B1/de
Priority to CA2743650A priority patent/CA2743650C/en
Publication of EP2402968A1 publication Critical patent/EP2402968A1/de
Application granted granted Critical
Publication of EP2402968B1 publication Critical patent/EP2402968B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/70—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard
    • H01H13/84—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard characterised by ergonomic functions, e.g. for miniature keyboards; characterised by operational sensory functions, e.g. sound feedback
    • H01H13/85—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard characterised by ergonomic functions, e.g. for miniature keyboards; characterised by operational sensory functions, e.g. sound feedback characterised by tactile feedback features
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/70—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard
    • H01H13/88—Processes specially adapted for manufacture of rectilinearly movable switches having a plurality of operating members associated with different sets of contacts, e.g. keyboards
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2209/00—Layers
    • H01H2209/01—Increasing rigidity; Anti-creep
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2221/00—Actuators
    • H01H2221/002—Actuators integral with membrane
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2221/00—Actuators
    • H01H2221/036—Return force
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2221/00—Actuators
    • H01H2221/036—Return force
    • H01H2221/044—Elastic part on actuator or casing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2221/00—Actuators
    • H01H2221/054—Actuators connected by flexible webs
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2221/00—Actuators
    • H01H2221/074—One molded piece
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2227/00—Dimensions; Characteristics
    • H01H2227/002—Layer thickness
    • H01H2227/004—Membrane

Definitions

  • the field of the disclosure relates generally to keypads and keypad assemblies, with particular but by no means exclusive application to keypads of mobile communications devices.
  • Deflection webs are typically flexible membranes interposed between the keys of a keypad and an underlying printed circuit board (PCB) containing switches which may be activated upon depression of the corresponding key(s). Deflection webs provide some protection against water and other contaminants interfering with the operation of the PCB. As well, deflection webs may be used as positioning and depression guides for the keys of the keypad assembly.
  • PCB printed circuit board
  • US 2008/019005 A1 discloses a back light unit.
  • the back light unit includes a light guide plate having a light guide pattern part; at least one light emitting unit provided at a sidewall of the light guide plate, and irradiating light to the light guide plate; a keypad positioned over the light guide plate, and comprising a resin layer, a base resin layer, a character opening part having a character shape, a key assembly provided at one side, and a key adherence film provided on an upper surface of the base resin layer; and a printed circuit board comprising a metal dome switch positioned under a lower surface of the light guide plate.
  • a keypad assembly comprising: a plurality of keys; a deflection web comprising a plurality of actuators resiliently coupled together by a flexible membrane, wherein each actuator corresponds to a key; wherein around each actuator, the flexible membrane comprises a corresponding radially outwardly extending flange; wherein a thickness of the flange varies in a direction from the corresponding actuator; and wherein when a key is in a first undepressed position, the corresponding flange exerts a pre-load force on the corresponding actuator.
  • each actuator may comprise a seat for receiving a key.
  • the keypad assembly may include a keypad base having a plurality of switches, each switch corresponding to one of the plurality of keys. Further, the keypad base may have an overlay superimposed thereon, with a dome corresponding to, and covering, each switch. The height of each dome may be approximately equal to the displacement of the corresponding actuator required to cause an upper surface of the corresponding flange to lie substantially orthogonal to said displacement.
  • the deflection web may be provided between the plurality of keys and the keypad base, and in some embodiments, the deflection web may be anchored to the keypad base.
  • the corresponding actuator When a key is in a first undepressed position, the corresponding actuator may be displaced by the height of the corresponding dome. Further, this may cause an upper surface of the corresponding flange to lie substantially flat proximate the corresponding actuator.
  • the upper surface of the flexible membrane when each key is in a first undepressed position, may be substantially planar. Further, when each key is in a first undepressed position, for each actuator a component of the pre-load force may be exerted in a downward direction.
  • the keypad assembly may further comprise a light shielding layer provided between the plurality of keys and the deflection web. A maximum downward displacement of each key may be approximately equal to a displacement required to activate the corresponding switch.
  • the keypad assembly may be configured for use in a mobile device.
  • a mobile device comprising the keypad assembly is provided.
  • each actuator when each actuator is depressed, the corresponding flange may exert a force on the actuator to counteract the depression.
  • a chamfer may be provided at the intersection of each flange and corresponding actuator.
  • the flexible membrane may comprise an elastomeric material.
  • Each actuator may be configured to receive a key of a keypad assembly, and the deflection web may be configured for anchoring to a keypad base.
  • each actuator when the deflection web is anchored to a keypad base, each actuator may be depressible from a first undepressed position wherein the flexible membrane is substantially planar.
  • a method of creating a deflection web for a keypad assembly comprising: providing a plurality of actuators in a substantially planar configuration, wherein each actuator is configured to receive a key of the keypad assembly; providing a flexible membrane resiliently coupling the plurality of actuators together, wherein around each actuator, the flexible membrane comprises a corresponding radially outwardly extending flange, and wherein a thickness of the flange varies in a direction from the corresponding actuator; anchoring the flexible member to a keypad base, wherein when a key is in a first undepressed position, the corresponding flange exerts a pre-load force on the corresponding actuator.
  • a portion of the deflection web may be co-molded to frame.
  • the frame may be made of hard plastic and may be injection molded.
  • the flexible membrane comprises an elastomeric material.
  • a mobile device may be a two-way communication device with advanced data communication capabilities having the capability to communicate with other computer systems.
  • a mobile device may also include the capability for voice communications.
  • it may be referred to as a data messaging device, a two-way pager, a cellular telephone with data messaging capabilities, a wireless Internet appliance, or a data communication device (with or without telephony capabilities), for example.
  • a mobile device may communicate with other devices through a network of transceiver stations.
  • FIGS. 1 through 3 To aid the reader in understanding the structure of a mobile device and how it communicates with other devices, reference is made to FIGS. 1 through 3 .
  • Mobile device 100 comprises a number of components, the controlling component being microprocessor 102 .
  • Microprocessor 102 controls the overall operation of mobile device 100 .
  • Communication functions, including data and voice communications, may be performed through communication subsystem 104 .
  • Communication subsystem 104 may be configured to receive messages from and send messages to a wireless network 200 .
  • communication subsystem 104 may be configured in accordance with the Global System for Mobile Communication (GSM) and General Packet Radio Services (GPRS) standards.
  • GSM Global System for Mobile Communication
  • GPRS General Packet Radio Services
  • the GSM/GPRS wireless network is used worldwide and it is expected that these standards may be supplemented or superseded eventually by Enhanced Data GSM Environment (EDGE) and Universal Mobile Telecommunications Service (UMTS), and Ultra Mobile Broadband (UMB), etc. New standards are still being defined, but it is believed that they will have similarities to the network behaviour described herein, and it will also be understood by persons skilled in the art that the embodiments of the present disclosure are intended to use any other suitable standards that are developed in the future.
  • the wireless link connecting communication subsystem 104 with network 200 represents one or more different Radio Frequency (RF) channels, operating according to defined protocols specified for GSM/GPRS communications. With newer network protocols, these channels are capable of supporting both circuit switched voice communications and packet switched data communications.
  • RF Radio Frequency
  • wireless network associated with mobile device 100 is a GSM/GPRS wireless network in one example implementation of mobile device 100
  • other wireless networks may also be associated with mobile device 100 in variant implementations.
  • Different types of wireless networks that may be employed include, for example, data-centric wireless networks, voice-centric wireless networks, and dual-mode networks that can support both voice and data communications over the same physical base stations.
  • Combined dual-mode networks include, but are not limited to, Code Division Multiple Access (CDMA) or CDMA2000 networks, GSM/GPRS networks (as mentioned above), and future third-generation (3G) networks like EDGE and UMTS.
  • CDMA Code Division Multiple Access
  • 3G Third-generation
  • Some older examples of data-centric networks include the Mobitex TM Radio Network and the DataTAC TM Radio Network.
  • Examples of older voice-centric data networks include Personal Communication Systems (PCS) networks like GSM and Time Division Multiple Access (TDMA) systems.
  • PCS Personal Communication Systems
  • TDMA Time Division Multiple Access
  • Other network communication technologies that may be employed include, for example, Integrated Digital Enhanced Network (iDEN TM ), Evolution-Data Optimized (EV-DO), and High Speed Packet Access (HSPA), etc.
  • iDEN TM Integrated Digital Enhanced Network
  • EV-DO Evolution-Data Optimized
  • HSPA High Speed Packet Access
  • Microprocessor 102 may also interact with additional subsystems such as a Random Access Memory (RAM) 106 , flash memory 108 , display 110 , auxiliary input/output (I/O) subsystem 112 , serial port 114 , keyboard 116 , speaker 118 , microphone 120 , short-range communications subsystem 122 and other device subsystems 124 .
  • RAM Random Access Memory
  • I/O auxiliary input/output subsystem 112
  • serial port 114 serial port 114
  • keyboard 116 keyboard 116
  • speaker 118 microphone 120
  • short-range communications subsystem 122 microphone
  • Some of the subsystems of mobile device 100 perform communication-related functions, whereas other subsystems may provide "resident" or on-device functions.
  • display 110 and keyboard 116 may be used for both communication-related functions, such as entering a text message for transmission over network 200 , as well as device-resident functions such as a calculator or task list.
  • Operating system software used by microprocessor 102 is typically stored in a persistent store such as flash memory 108, which may alternatively be a read-only memory (ROM) or similar storage element (not shown).
  • ROM read-only memory
  • Mobile device 100 may send and receive communication signals over network 200 after network registration or activation procedures have been completed. Network access may be associated with a subscriber or user of a mobile device 100 .
  • mobile device 100 may provide for a Subscriber Identity Module (“SIM") card 126 to be inserted in a SIM interface 128 in order to communicate with a network.
  • SIM 126 may be one example type of a conventional "smart card” used to identify a subscriber of mobile device 100 and to personalize the mobile device 100 , among other things. Without SIM 126 , mobile device 100 may not be fully operational for communication with network 200 . By inserting SIM 126 into SIM interface 128 , a subscriber may access all subscribed services.
  • SIM 126 may include a processor and memory for storing information. Once SIM 126 is inserted in SIM interface 128 , it may be coupled to microprocessor 102 . In order to identify the subscriber, SIM 126 may contain some user parameters such as an International Mobile Subscriber Identity (IMSI). By using SIM 126 , a subscriber may not necessarily be bound by any single physical mobile device. SIM 126 may store additional subscriber information for a mobile device as well, including datebook (or calendar) information and recent call information.
  • IMSI International Mobile Subscriber Identity
  • Mobile device 100 may be a battery-powered device and may comprise a battery interface 132 for receiving one or more rechargeable batteries 130 .
  • Battery interface 132 may be coupled to a regulator (not shown), which assists battery 130 in providing power V+ to mobile device 100 .
  • a regulator not shown
  • future technologies such as micro fuel cells may provide power to mobile device 100 .
  • mobile device 100 may be solar-powered.
  • Microprocessor 102 in addition to its operating system functions, enables execution of software applications on mobile device 100 .
  • a set of applications that control basic device operations, including data and voice communication applications, may be installed on mobile device 100 during its manufacture.
  • Another application that may be loaded onto mobile device 100 is a personal information manager (PIM).
  • PIM has functionality to organize and manage data items of interest to a subscriber, such as, but not limited to, e-mail, calendar events, voice mails, appointments, and task items.
  • a PIM application has the ability to send and receive data items via wireless network 200 .
  • PIM data items may be seamlessly integrated, synchronized, and updated via wireless network 200 with the mobile device subscriber's corresponding data items stored and/or associated with a host computer system. This functionality may create a mirrored host computer on mobile device 100 with respect to such items. This can be particularly advantageous where the host computer system is the mobile device subscriber's office computer system.
  • Additional applications may also be loaded onto mobile device 100 through network 200 , auxiliary I/O subsystem 112 , serial port 114 , short-range communications subsystem 122 , or any other suitable subsystem 124 .
  • This flexibility in application installation increases the functionality of mobile device 100 and may provide enhanced on-device functions, communication-related functions, or both.
  • secure communication applications may enable electronic commerce functions and other such financial transactions to be performed using mobile device 100 .
  • Serial port 114 enables a subscriber to set preferences through an external device or software application and extends the capabilities of mobile device 100 by providing for information or software downloads to mobile device 100 other than through a wireless communication network.
  • the alternate download path may, for example, be used to load an encryption key onto mobile device 100 through a direct and thus reliable and trusted connection to provide secure device communication.
  • Short-range communications subsystem 122 provides for communication between mobile device 100 and different systems or devices, without the use of network 200 .
  • subsystem 122 may include an infrared device and associated circuits and components for short-range communication.
  • Examples of short range communication include standards developed by the Infrared Data Association (IrDA), Bluetooth ® , and the 802.11 family of standards (Wi-Fi ® ) developed by IEEE.
  • a received signal such as a text message, an e-mail message, or web page download is processed by communication subsystem 104 and input to microprocessor 102 .
  • Microprocessor 102 then processes the received signal for output to display 110 or alternatively to auxiliary I/O subsystem 112 .
  • a subscriber may also compose data items, such as e-mail messages, for example, using keyboard 116 in conjunction with display 110 and possibly auxiliary I/O subsystem 112 .
  • Auxiliary subsystem 112 may include devices such as: a touch screen, mouse, track ball, optical trackpad, infrared fingerprint detector, or a roller wheel with dynamic button pressing capability.
  • Keyboard 116 may comprise an alphanumeric keyboard and/or telephone-type keypad, for example.
  • a composed item may be transmitted over network 200 through communication subsystem 104 .
  • mobile device 100 For voice communications, the overall operation of mobile device 100 may be substantially similar, except that the received signals may be processed and output to speaker 118 , and signals for transmission may be generated by microphone 120 .
  • Alternative voice or audio I/O subsystems such as a voice message recording subsystem, may also be implemented on mobile device 100 .
  • voice or audio signal output is accomplished primarily through speaker 118 , display 110 may also be used to provide additional information such as the identity of a calling party, duration of a voice call, or other voice call related information.
  • Communication subsystem 104 may comprise a receiver 150 , a transmitter 152 , one or more embedded or internal antenna elements 154 , 156 , Local Oscillators (LOs) 158 , and a processing module such as a Digital Signal Processor (DSP) 160.
  • LOs Local Oscillators
  • DSP Digital Signal Processor
  • communication subsystem 104 The particular design of communication subsystem 104 is dependent upon the network 200 in which mobile device 100 is intended to operate; thus, it should be understood that the design illustrated in FIG. 2 serves only as one example.
  • Signals received by antenna 154 through network 200 are input to receiver 150 , which may perform such common receiver functions as signal amplification, frequency down conversion, filtering, channel selection, and analog-to-digital (A/D) conversion.
  • A/D conversion of a received signal allows more complex communication functions such as demodulation and decoding to be performed in DSP 160 .
  • signals to be transmitted are processed, including modulation and encoding, by DSP 160 .
  • DSP-processed signals are input to transmitter 152 for digital-to-analog (D/A) conversion, frequency up conversion, filtering, amplification and transmission over network 200 via antenna 156 .
  • DSP 160 not only processes communication signals, but also provides for receiver and transmitter control. For example, the gains applied to communication signals in receiver 150 and transmitter 152 may be adaptively controlled through automatic gain control algorithms implemented in DSP 160 .
  • the wireless link between mobile device 100 and a network 200 may contain one or more different channels, typically different RF channels, and associated protocols used between mobile device 100 and network 200 .
  • a RF channel is generally a limited resource, typically due to limits in overall bandwidth and limited battery power of mobile device 100 .
  • transmitter 152 When mobile device 100 is fully operational, transmitter 152 may be typically keyed or turned on only when it is sending to network 200 and may otherwise be turned off to conserve resources. Similarly, receiver 150 may be periodically turned off to conserve power until it is needed to receive signals or information (if at all) during designated time periods.
  • network 200 comprises one or more nodes 202 .
  • Mobile device 100 communicates with a node 202 within wireless network 200 .
  • node 202 is configured in accordance with GPRS and GSM technologies; however, in other embodiments, different standards may be implemented as discussed in more detail above.
  • Node 202 includes a base station controller (BSC) 204 with an associated tower station 206 , a Packet Control Unit (PCU) 208 added for GPRS support in GSM, a Mobile Switching Center (MSC) 210 , a Home Location Register (HLR) 212 , a Visitor Location Registry (VLR) 214 , a Serving GPRS Support Node (SGSN) 216 , a Gateway GPRS Support Node (GGSN) 218 , and a Dynamic Host Configuration Protocol (DHCP) server 220 .
  • BSC base station controller
  • PCU Packet Control Unit
  • MSC Mobile Switching Center
  • HLR Home Location Register
  • VLR Visitor Location Registry
  • SGSN Serving GPRS Support Node
  • GGSN Gateway GPRS Support Node
  • DHCP Dynamic Host Configuration Protocol
  • MSC 210 is coupled to BSC 204 and to a landline network, such as a Public Switched Telephone Network (PSTN) 222 to satisfy circuit switched requirements.
  • PSTN Public Switched Telephone Network
  • the connection through PCU 208 , SGSN 216 and GGSN 218 to the public or private network (Internet) 224 (also referred to herein generally as a shared network infrastructure) represents the data path for GPRS capable mobile devices.
  • BSC 204 also contains a Packet Control Unit (PCU) 208 that connects to SGSN 216 to control segmentation, radio channel allocation and to satisfy packet switched requirements.
  • PCU Packet Control Unit
  • HLR 212 is shared between MSC 210 and SGSN 216 . Access to VLR 214 is controlled by MSC 210 .
  • Station 206 may be a fixed transceiver station. Station 206 and BSC 204 together may form the fixed transceiver equipment.
  • the fixed transceiver equipment provides wireless network coverage for a particular coverage area commonly referred to as a "cell".
  • the fixed transceiver equipment transmits communication signals to and receives communication signals from mobile devices within its cell via station 206 .
  • the fixed transceiver equipment normally performs such functions as modulation and possibly encoding and/or encryption of signals to be transmitted to the mobile device in accordance with particular, usually predetermined, communication protocols and parameters, under control of its controller.
  • the fixed transceiver equipment similarly demodulates and possibly decodes and decrypts, if necessary, any communication signals received from mobile device 100 within its cell. Communication protocols and parameters may vary between different nodes. For example, one node may employ a different modulation scheme and operate at different frequencies than other nodes.
  • HLR 212 For all mobile devices 100 registered with a specific network, permanent configuration data such as a user profile may be stored in HLR 212 .
  • HLR 212 may also contain location information for each registered mobile device and can be queried to determine the current location of a mobile device.
  • MSC 210 is responsible for a group of location areas and stores the data of the mobile devices currently in its area of responsibility in VLR 214 .
  • VLR 214 also contains information on mobile devices that are visiting other networks. The information in VLR 214 includes part of the permanent mobile device data transmitted from HLR 212 to VLR 214 for faster access. By moving additional information from a remote HLR 212 node to VLR 214 , the amount of traffic between these nodes can be reduced so that voice and data services can be provided with faster response times while requiring less use of computing resources.
  • SGSN 216 and GGSN 218 are elements that may be added for GPRS support ; namely packet switched data support, within GSM.
  • SGSN 216 and MSC 210 have similar responsibilities within wireless network 200 by keeping track of the location of each mobile device 100 .
  • SGSN 216 also performs security functions and access control for data traffic on network 200 .
  • GGSN 218 provides internetworking connections with external packet switched networks and connects to one or more SGSNs 216 via an Internet Protocol (IP) backbone network operated within the network 200 .
  • IP Internet Protocol
  • a given mobile device 100 performs a "GPRS Attach" to acquire an IP address and to access data services.
  • GPRS capable networks may use private, dynamically assigned IP addresses, thus requiring a DHCP server 220 connected to the GGSN 218 .
  • RADIUS Remote Authentication Dial-In User Service
  • a logical connection is established from a mobile device 100 , through PCU 208 , and SGSN 216 to an Access Point Node (APN) within GGSN 218 , for example.
  • APN Access Point Node
  • the APN represents a logical end of an IP tunnel that can either access direct Internet compatible services or private network connections.
  • the APN also represents a security mechanism for network 200 , insofar as each mobile device 100 must be assigned to one or more APNs and mobile devices 100 cannot generally exchange data without first performing a GPRS Attach to an APN that it has been authorized to use.
  • the APN may be considered to be similar to an Internet domain name such as "myconnection.wireless.com".
  • IPsec IP Security
  • VPN Virtual Private Networks
  • PDP Packet Data Protocol
  • network 200 will run an idle timer for each PDP Context to determine if there is a lack of activity.
  • the PDP Context can be deallocated and the IP address returned to the IP address pool managed by DHCP server 220 .
  • a deflection web according to an embodiment of the present invention is shown generally as 400 .
  • the deflection web 400 may be used as a component of a keypad assembly of a mobile device 100 , such as the mobile device 100 described above.
  • the interaction of the deflection web 400 with various components of a keypad assembly of a mobile device 100 will be described in more detail below in relation to FIGS. 6A and 6B .
  • the deflection web 400 may comprise a plurality of actuators 410 aligned in a planar arrangement and resiliently coupled together by a flexible membrane 420 .
  • the actuators 410 may correspond in number, shape, and configuration to the plurality of keys to be used therewith.
  • the embodiment illustrated in FIG. 4A is configured to accommodate a full QWERTY keyboard. Other configurations may also exist to correspond to keyboards with different numbers of and arrangements of keys.
  • FIG. 4B is an enlargement of the portion 4B of the deflection web 400 circled in FIG. 4A .
  • Each actuator 410 comprises a seat 412 for receiving a key of a keyboard 116 .
  • a portion of the flexible membrane 420 coupling the actuators 410 together comprises a flange 430 (represented by the area of the flexible membrane 420 around each actuator 410 within the surrounding dotted lines) that extends radially outwardly from the periphery of each actuator 410 .
  • an upper surface 425 ( FIG. 5A ) of the flexible membrane 420 may not be coplanar with an upper surface 435 ( FIG. 5A ) of the flange 430 when the deflection web 400 is in a relaxed state (i.e. when the deflection web 400 is free of externally applied forces). Advantages of such a non-planar configuration will be discussed further below.
  • a light shielding layer may be overlaid onto the deflection web 400 and/or provided between the plurality of keys and the deflection web 400 when assembled within a keypad assembly.
  • FIG. 4C in which an example of a light shielding layer 450 is shown overlaid onto the deflection web 400 in the direction of arrows 10 .
  • FIG. 5A illustrates a sectional view of the deflection web 400 along section line A-A of FIG. 4B .
  • the thickness of the flange 430 of each actuator 410 i.e. the distance between the upper surface 435 and a lower surface 437 of the flange 430 ) varies in a direction D from each actuator 410 .
  • the direction D may be a direction radially outward from the corresponding actuator 410 .
  • each flange 430 increases at a substantially constant rate for at least a portion of the flange 430 as the flange 430 extends outwardly away (in a direction D ) from its corresponding actuator 410 -this is due to the upper surface 435 of the flange 430 extending from the actuator 410 at an incline while the lower surface 437 of the flange 430 extends with substantially no incline (i.e. substantially horizontally) from the actuator 410 .
  • the thickness of the flange 430 may increase or decrease at either an increasing or decreasing rate (or a combination thereof) as it extends outwardly from the actuator 410 .
  • the thickness of the flange 430 may be varied in order to achieve desired pre-loading characteristics when the deflection web 400 experiences a deformation.
  • the repetitive forces sustained by the deflection web 400 from continuous depression of one or more of the keys may cause concentrated stress zones in the deflection web 400 where each flange 430 meets its corresponding actuator 410 .
  • the deflection web 400 may be provided with a chamfer 432 where each flange 430 and corresponding actuator 410 converge.
  • a chamfer helps to alleviate stress at sharp edges of structures by effectively smoothing out the edge, making it more gradual.
  • Such chamfers 432 can be observed on the deflection web 400 of FIG. 5A .
  • FIG. 5B illustrates an alternate embodiment of a deflection web 400 * having corresponding parts but lacking described chamfers.
  • the deflection web 400 (i.e. the actuators and the flexible membrane 420 ) may comprise a flexible material (e.g. an elastomer or rubber material such as silicon rubber).
  • a flexible material e.g. an elastomer or rubber material such as silicon rubber.
  • the use of an elastomeric material for the deflection web 400 typically allows the web 400 to deform in response to an externally applied force and return to its natural orientation once the force is released.
  • the web 400 may tend to return to its natural orientation (or relaxed state) due to pre-load or tension forces produced within the web material when deformed.
  • depression of an actuator 410 of the deflection web 400 may induce a tension (or pre-load) force in the corresponding flange 430 , which is exerted on the actuator 410 , to counteract the depression.
  • FIG. 6A illustrates the sectional view of FIG. 5A showing the interaction of the deflection web 400 with various components of a keypad assembly 600 .
  • the keypad assembly 600 may comprise a plurality of keys 612 , 612' and a keypad base 620 .
  • the deflection web 400 may be provided between the keys 612 , 612' of a keypad assembly 600 and the base 620 of the keypad assembly 600 .
  • the keypad assembly 600 may comprise a light shielding layer 450 superimposed over the deflection web 400 .
  • the key 612' is shown in a first undepressed position, whereas the key 612 is shown in the depressed position as a result of an externally applied force F applied in a key depression direction 614 (i.e. towards a corresponding switch 632 ).
  • the force F may be applied, for example, by a user of the keypad assembly 600 while composing a message on a mobile device 100 .
  • the keypad base 620 may comprise a printed circuit board assembly having a plurality of switches 632 (one switch 632 provided for and corresponding to each key 612 and actuator 410 ).
  • the base 620 of the keypad assembly 600 may also comprise an overlay 633 having a plurality of domes 634 , 634' , each covering a corresponding switch 632 of the base 620 .
  • the deflection web 400 is anchored to the base 620 at selected locations 640 between the flanges 430 , 430' in order to facilitate pre-loading of the flanges in response to a displacement of the corresponding actuator 410 , 410' relative to the base 620 .
  • Anchoring of the deflection web 400 to the base 620 may be accomplished, for example, by co-molding the portions of the web 400 between each flange 430 , 430' to a frame (e.g. made of a hard plastic) and affixing the frame to the base 620 .
  • the web 400 may be affixed to a plurality of pins (not shown), which penetrate the web 400 between some or all of the flanges 430 , 430' and attach to the base 620 .
  • each actuator 410 , 410' aligns with a switch 632 , and the dome 634 covering each switch 632 exerts a force F D (sometimes referred to as the dome peak force, and further discussed below with reference to FIG. 6B ), on each actuator 410 , 410' , causing a displacement of each actuator 410 , 410' into the first undepressed position.
  • the displacement of the actuators 410 , 410' in combination with the anchoring of the deflection web 400 to the base 620 , causes the corresponding flanges 430 , 430' to stretch.
  • the stretched flange 430' exerts a pre-load force T on the corresponding actuator 410 partially in the key depression direction 614 .
  • the corresponding actuator 410 may make contact with the corresponding switch 632 (either directly or through an intermediary element such as the dome 634 , 634' of the overlay 633 ), signaling the depression of the key 612 .
  • Each switch 632 may comprise a pressure sensor or, alternatively, may comprise an electrical contact for contacting a complementary electrical contact (not shown) coupled to the underside of each dome 634 , 634' .
  • the dome 634' displaces the actuator 410 ' from its relaxed state (as illustrated in FIG. 5A , wherein the upper surface 435 of the flanges 430 extends from the actuators 410 at an incline) such that when the key 612' is in the first undepressed position, the upper surface 435' of the flange 430' is substantially flat and extends from the actuator 410' at substantially no incline (i.e. substantially horizontally).
  • the flanges 430 , 430' of the deflection web 400 may be designed taking into account the specifications of the overlay 633 that is to be used in the keypad assembly 600 .
  • the travel of the flanges 430 , 430' in the key depression direction 614 may be designed to be approximately equal to the height H of the domes 634 , 634' of the overlay 633 when the domes 634 , 634' are undepressed (or uncrushed).
  • the difference between the position x' of the upper surface 435' of the flange 430' proximate the actuator 410' when the key 612' is undepressed, and the position y' of the lowest point of the upper surface 435 of the flange 430 when the key 612 is depressed is roughly equal to the approximate height H of an uncrushed dome 634' less the thickness of the dome material.
  • the approximate height H of an uncrushed dome 634' is also roughly equal to the difference between the position x ( FIG. 5A ) of the upper surface 425 of the flexible membrane 420 (between the flanges 435 ), and the position y ( FIG. 5A ) of the lowest point of the upper surface 435 of the flange 430 proximate its corresponding actuator 410 .
  • the distance between position x and position y ( FIG. 5A ) corresponds approximately to the upward displacement to an actuator 410 required to cause the upper surface 435 of the corresponding flange 430 to lie substantially flat as it extends from the actuator 410 .
  • the top surface of the deflection web 400 through the interstices of the actuators 410 , 410' i.e. the combined top surface 435 , 435' of the flanges 430 , 430' and top surface 425 of the flexible membrane 420 ) may also be substantially flat.
  • Designing the flanges 430 , 430' of the deflection web 400 to be substantially flat when the keypad assembly 600 is assembled and the actuators 410 , 410' are in the undepressed position may help reduce the amount of light leakage from the keypad assembly 600 .
  • the light shielding layer 450 may be unaffected by movement of the actuators 410 , 410' between the undepressed position and the depressed position. Consequently, cracking of the light shielding layer 450 (which may cause increased light leakage) resulting from localized deformation may be reduced or avoided.
  • preventing deformation of the light shielding layer 450 may help to provide a user of the keypad assembly 600 with a better tactile feel when depressing the keys 410 , 410' by helping to ensure that external forces are not exerted on the flange 430' by the light shielding layer 450 when the actuator 410' is in the undepressed position.
  • the forces typically exerted on deflection webs by light shielding layers tend to be uneven and unpredictable. By reducing and/or eliminating such unpredictable forces exerted on the deflection web 400 , keypad assembly 600 designers may be better able to control the tactile feel provided to a user of the keypad assembly 600 .
  • FIG. 6B shows an enlargement of the portion 6B of the keypad assembly 600 circled in FIG. 6A and more clearly illustrates the pre-load force acting on the actuators 410' when the actuators 410' (and keys 612' ) are in the first undepressed position.
  • the actuator 410' in the absence of any externally applied forces to a key 612' (e.g. from a user of the keypad assembly 600 ), the actuator 410' is in the first undepressed position. In this position, the actuator 410' is displaced from its relaxed state (illustrated in FIG. 5A ) by the dome 634' with which it is in contact.
  • a tension (or pre-load) force T is induced within the flange 430' proximate its lower surface 437' as a result of deformation of the web. It will be appreciated by those skilled in the art that although a single tension force T is illustrated for simplicity, the tension force T may be exerted substantially evenly around the actuator 410' .
  • the tension force T may be broken down into a first component T x , which acts in a direction substantially parallel to the base 620 and extending radially outwardly from the actuator 410' , and a second component T y , which acts in a direction perpendicular to T x (i.e. toward the base 620 ).
  • the forces acting on the actuator 410' include F D , T x , and T y (as discussed above, the actuator may be free from forces exerted by the light shielding layer 450 ). Therefore, in order to cause a depression of the key 612' (and corresponding actuator 410' ), the force F ( FIG. 6A ) applied to the key 612' must be greater than ( F D - T y ).
  • the domes 634 , 634' must comprise a material strong enough to exert a force F D on the actuator 410' that is greater than the component T y of the tension force T in order for the dome 634' to cause the actuator 410' to return to the first undepressed position when the force F is released (e.g. the key 612' is released by a user of the keypad assembly 600 ).
  • the tension (or pre-load) force T may vary with the thickness of the flange 430 , 430' and with the composition of the flange 430 , 430' and the web 400 . Therefore, the thickness of the flange 430 , 430' (and/or the material from which the flange 430 , 430' and the web 400 are made) may be appropriately selected to provide the pre-load forces required to achieve the desired tactile feel (by controlling the magnitude of the force F required to depress the keys 612 , 612' ).
  • the flange may be designed such that the component T y of the pre-load force T is between ten and twenty-five percent of the dome peak force F D .
  • a plurality of actuators 410 , 410' are provided in a substantially planar configuration at Block 710 .
  • the plurality of actuators 410 , 410' are resiliently coupled together with a flexible membrane 420 .
  • the flexible membrane 420 comprises a surrounding portion (i.e. an outwardly radially extending flange 430 , 430' ) the thickness of which varies in a direction from the corresponding actuator 410 , 410' .
  • the deflection web 400 may be molded using an appropriately configured mold, or alternatively, may be created having separate flexible membrane 420 and actuator 410 , 410' components. Further, in some embodiments, a portion of the deflection web 400 (e.g. the portion not encompassing the actuators 410 , 410' or the flanges 435 , 435' ) may be co-molded to a frame.
  • the frame may be made of hard plastic, for example, and may be injection molded.
  • the flexible membrane 420 and actuators 410 , 410' may comprise a suitably resilient material, such as an elastomeric material. Further, the thickness of the flange 430 may be appropriately varied in order to induce the desired pre-load force T when the web 400 undergoes a deformation.
  • a deflection web 400 having a plurality of actuators resiliently coupled together is provided at Block 810 .
  • the actuators may be coupled together using a flexible membrane 420 and the actuators and flexible membrane 420 may comprise an elastomeric material in order to provide suitable pre-loading characteristics when the web 400 is deformed.
  • the deflection web 400 may be anchored to a keypad base 620 such that a pre-load force T is generated in a flange 430, 430' portion of the flexible membrane 420 surrounding each actuator 410 , 410' .
  • the deflection web 400 may be anchored using Known techniques including, but not limited to, adhesive bonding and riveting.
  • the keypad base 620 may comprise a plurality of switches 632 and an overlay 633 with a plurality of domes 634 , 634' (a dome 634 , 634' corresponding to, and covering, each switch 632 ).
  • the domes 634, 634' of the overlay 633 may cause the actuator 410 to deform and settle in the first undepressed position (as described above). While in the undepressed position, the upper surface 435 of the flange may be substantially flat proximate its corresponding actuator 410.
  • a plurality of keys 612 , 612' is provided. Each key 612 , 612' is configured to sit within an actuator 410 of the deflection web 400 .
  • the plurality of keys 612 , 612' are positioned such that each key 612 , 612' sits in a seat 412 , 412' of an actuator 410 , 410' of the deflection web 400.
  • the keys 612 , 612' may be coupled to the actuators 410 , 410' (e.g. using an adhesive) in order to ensure that the proper positioning of the keys 612 , 612' within the actuators 410 , 410' is maintained.
  • the embodiments of keypad assemblies described herein may allow for desired pre-loading of the flange portions of the deflection web of the assembly. Accordingly, a user of the assemblies may experience a greater tactile feel and response when pressing keys.

Landscapes

  • Telephone Set Structure (AREA)

Claims (13)

  1. Eine Tastaturanordnung (600), die aufweist:
    (a) eine Vielzahl von Tasten (612, 612');
    (b) ein Ableitungsnetz (400), das eine Vielzahl von Aktuatoren (410, 410') aufweist, die elastisch durch eine flexible Membran (420) miteinander gekoppelt sind, wobei jeder Aktuator (410, 410') einer Taste (612, 612') entspricht;
    (c) wobei um jeden Aktuator (410, 410') herum die flexible Membran (420) einen entsprechenden, sich radial nach außen erstreckenden Flansch (430, 430') aufweist;
    (d) wobei eine Dicke des Flansches (430, 430') in einer Richtung (D) von dem entsprechenden Aktuator (410, 410') variiert; und
    (e) wobei, wenn eine Taste (612, 612') in einer ersten nicht-gedrückten Position ist, der entsprechende Flansch (430, 430') eine Vorspannkraft (T) auf den entsprechenden Aktuator (410, 410') ausübt.
  2. Die Tastaturanordnung (600) gemäß Anspruch 1, wobei eine untere Fläche (437, 437') des Flansches (430, 430') und eine obere Fläche (435, 435') des Flansches (430, 430') nicht-parallel sind.
  3. Die Tastaturanordnung (600) gemäß Anspruch 1, wobei eine Komponente (Ty) der Vorspannkraft (T) in eine Tastendrückrichtung (614) ausgeübt wird.
  4. Die Tastaturanordnung (600) gemäß einem vorhergehenden Anspruch, die weiter eine Tastaturbasis (620) mit einer Vielzahl von Schaltern (632) aufweist, wobei jeder Schalter einer der Vielzahl von Tasten (612, 612') entspricht.
  5. Die Tastaturanordnung (600) gemäß Anspruch 4, die weiter eine Überlagerung (633) aufweist, die über der Tastaturbasis (620) liegt, wobei die Überlagerung (633) eine Kuppe (634) entsprechend zu jedem Schalter (632) hat.
  6. Die Tastaturanordnung (600) gemäß Anspruch 5, wobei, wenn die Taste (612, 612') in der ersten nicht-gedrückten Position ist, eine obere Fläche (435, 435') des entsprechenden Flansches (430, 430') im Wesentlichen flach nahe des entsprechenden Aktuators (410, 410') ist.
  7. Eine Tastaturanordnung (600) gemäß einem vorhergehenden Anspruch, wobei die Anordnung zur Verwendung in einer mobilen Vorrichtung konfiguriert ist.
  8. Die Tastaturanordnung (600) gemäß einem vorhergehenden Anspruch, wobei die Dicke des Flansches (430, 430') zunimmt, wenn sich der Flansch (430, 430') in die Richtung (D) von dem entsprechenden Aktuator (410, 410') erstreckt.
  9. Die Tastaturanordnung (600) gemäß Anspruch 8, die weiter eine Fase an einem Schnittpunkt jedes Flansches (430, 430') und des entsprechenden Aktuators (410, 410') aufweist.
  10. Die Tastaturanordnung (600) gemäß einem vorhergehenden Anspruch, wobei jeder Aktuator (410, 410') konfiguriert ist zum Aufnehmen einer Taste (612, 612') der Tastaturanordnung (600).
  11. Die Tastaturanordnung (600) gemäß einem vorhergehenden Anspruch, wobei das Ableitungsnetz (400) weiter konfiguriert ist zum Verankern mit einer Tastaturbasis (620).
  12. Ein Verfahren zum Erzeugen eines Ableitungsnetzes (400) für eine Tastaturanordnung (600), wobei das Verfahren aufweist:
    (a) Vorsehen einer Vielzahl von Aktuatoren (410, 410') in einer im Wesentlichen planaren Konfiguration, wobei jeder Aktuator (410, 410') konfiguriert ist zum Aufnehmen einer Taste (612, 612') der Tastaturanordnung (600);
    (b) Vorsehen einer flexiblen Membran (420), die elastisch die Vielzahl von Aktuatoren (410, 410') miteinander koppelt, wobei um jeden Aktuator (410, 410) herum die flexible Membran (420) einen entsprechenden, sich radial nach außen erstreckenden Flansch (430, 430') aufweist, und wobei eine Dicke des Flansches (430, 430') in eine Richtung (D) von dem entsprechenden Aktuator (410, 410') variiert;
    (c) Verankern der flexiblen Membran auf einer Tastaturbasis (620), wobei, wenn eine Taste (612, 612') in einer ersten nicht-gedrückten Position ist, der entsprechende Flansch (430, 430') eine Vorspannkraft (T) auf den entsprechenden Aktuator (410, 410') ausübt.
  13. Das Verfahren gemäß Anspruch 12, das weiter ein Zusammenformen eines Teils des Ableitungsnetzes (400) mit einem Rahmen aufweist.
EP20100167824 2010-06-30 2010-06-30 Umlenksteg für eine Tastaturanordnung Active EP2402968B1 (de)

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EP20100167824 EP2402968B1 (de) 2010-06-30 2010-06-30 Umlenksteg für eine Tastaturanordnung
CA2743650A CA2743650C (en) 2010-06-30 2011-06-16 Deflection web for a keypad assembly

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Application Number Priority Date Filing Date Title
EP20100167824 EP2402968B1 (de) 2010-06-30 2010-06-30 Umlenksteg für eine Tastaturanordnung

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102048514B1 (ko) 2012-06-26 2019-11-25 삼성전자 주식회사 키 조립체 및 이것을 갖는 전자 장치

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Publication number Priority date Publication date Assignee Title
EP2680291B1 (de) * 2012-06-26 2018-03-21 Samsung Electronics Co., Ltd Tastenanordnung und elektronisches Vorrichtung damit

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KR960003475U (ko) * 1994-06-08 1996-01-22 라이팅 리모트콘트롤
ATE529874T1 (de) * 2002-08-19 2011-11-15 Leica Geosystems Ag Flachtastatur
DE112004000492B4 (de) * 2003-04-03 2008-11-06 Danfoss Drives A/S Abdeckung für einen Tastenschalter
US7736042B2 (en) * 2006-07-20 2010-06-15 Ls Tech Co., Ltd. Back light unit

Cited By (1)

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Publication number Priority date Publication date Assignee Title
KR102048514B1 (ko) 2012-06-26 2019-11-25 삼성전자 주식회사 키 조립체 및 이것을 갖는 전자 장치

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CA2743650C (en) 2016-05-31
EP2402968A1 (de) 2012-01-04

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