# Patent

## Title
Terminal case with integrated reader and shortened base

## Abstract

Aspects of the technology provide a case for a mobile device, wherein the case includes a body, and a base configured to be mechanically coupled to the body. In certain aspects, the base includes a reader configured for reading financial information from a payment card for facilitating a financial transaction between a buyer and a merchant, a card slot disposed within the base, the card slot configured to receive the payment card, and wherein the card reader comprises a tip-ring-ring-sleeve (TRRS) connector having a protruding portion and a modified base portion, and wherein the modified base portion provides not more than two electrical connections between the TRRS connector and the reader.

## Background
BACKGROUND
1. Technical Field
The subject application relates to a case for a mobile point of sale (POS) terminal and in particular, to a case for a mobile device that includes an embedded card reader for reading a financial payment card.
2. Introduction
The increasing prevalence of mobile computing devices, such as smart phones and tablet computers, has spurred an increase in popularity for protective carrying cases. While some cases provide various types of mechanical functionality, such as protective or carrying features, conventional cases rarely provide hardware enhancements or offer expanded communication functionality.



BRIEF DESCRIPTION OF THE DRAWINGS
Certain features of the subject technology are set forth in the appended claims. However, the accompanying drawings, which are included to provide further understanding, illustrate disclosed aspects and together with the description serve to explain the principles of the subject technology. In the drawings:
FIG. 1A illustrates an example of a case for a mobile computing device, according to some aspects of the subject technology.
FIG. 1B illustrates an example of a case of the subject technology, as used in conjunction with a mobile computing device.
FIG. 1C depicts an end perspective view of a case, illustrating a card slot that can be used for receiving a financial payment card, according to some aspects.
FIG. 2A illustrates a block diagram of an example audio plug, including a modified base portion and corresponding electrical wiring, according to some implementations of the technology.
FIG. 2B illustrates a cut-away view of an audio plug, according to some aspects of the technology.
FIG. 2C illustrates another example of an audio plug, including a modified base portion, according to some aspects of the technology.
FIG. 3 depicts a block diagram of hardware components that can be used to implement a card reader of the subject technology.
FIG. 4 conceptually illustrates an example environment in which a case containing a card reader can be used to facilitate a financial transaction between a buyer and a merchant.



DETAILED DESCRIPTION
The detailed description set forth below is intended as a description of various configurations of the subject technology and is not intended to represent the only configurations in which the technology can be practiced. The appended drawings are incorporated herein and constitute a part of the detailed description, which includes specific details for the purpose of providing a more thorough understanding of the subject technology. However, it will be clear and apparent that the subject technology is not limited to the specific details set forth herein and may be practiced without these specific details. In some instances, structures and components are shown in block diagram form in order to avoid obscuring the concepts of the subject technology.
The subject technology relates to a case for a mobile computing device, such as a smart phone, mobile computer or tablet device, etc., that includes a card reader for reading a buyer's payment card, e.g., to facilitate a financial transaction. Although, the case can include different numbers of parts (or pieces) that mechanically integrate to surround all, or a portion of a mobile device, in some implementations the case includes two portions, i.e., a “body” portion, and a “base” portion.
As discussed in further detail below, the case includes an integrated card reader that communicatively couples with the mobile device, for example, via a protruding plug or audio jack, such as a headphone jack, of the mobile device. The card reader can facilitate the reading of a payment card, such as a credit card or debit card, for use in facilitating a financial transaction, for example, between a buyer and a merchant. As such, a case of the subject technology can be used to expand functionality of the mobile device, so that, together with the case and integrated card reader, the unit may function as a mobile point of sale terminal.
Physical integration of the card reader (e.g., card reader hardware and circuitry) in the case can depend on case design. In certain aspects, the card reader can be integrated into the base of the case that mechanically couples with the larger body portion, e.g., to retain/cover or surround edges of a tablet computer or smartphone device. However, it is understood that in different implementations, the card reader can be differently disposed within the case. For example, the card reader can be placed in a larger (body) portion, whereas a smaller (base) portion may contain no reader hardware or circuitry.
In some implementations, the card reader comprises a connector for coupling the reader to the mobile device. The connector can include a base portion, as well as a protruding segment configured for insertion into an audio port (headphone port) of the mobile device. In certain aspects, the protruding segment of the connector is configured in a tip-ring-ring-sleeve (TRRS) configuration, for example, such as that of a 3.5 mm audio jack or plug that includes left and right audio channels, as well as a microphone channel. However, to enable a low-profile of the case, the TRRS connector can be connected to the reader using a modified (shortened) base. The modified base can be achieved by containing, for example, only two electrical connections or channels between the modified base and the protruding TRRS connector. That is, electrical connectivity between the modified base and the protruding plug can utilize only a portion of the available electrical connections of a standard TRRS connector.
In one example, a modified base and TRRS connector can contain only a microphone and ground channels, whereas the standard left and right audio channels are eliminated. In such a configuration, elimination of left and right audio channels can enable a reduction in the size of the base that provides electrical connection between the TRRS connector and the card reader. In turn, a thickness of the case in which the card reader is disposed may be reduced.
FIG. 1A illustrates an example of a case 102 for use with a mobile computing device. Case 102 includes two portions, body 102A, and base 102B. Furthermore, the illustration of case 102 depicts a protruding portion of audio plug 106, that functions to electrically/communicatively couple a mobile computing device (not shown) with a card reader integrated within case 102, e.g., via modified base 107. As illustrated, audio plug 106 is bound to case 102 via modified base 107. That is, modified base 107 resides within base 102B to provide a coupling between audio plug 106 and the card reader hardware/circuitry (not illustrated).
As discussed in further detail below, a size (width) of modified base 107 can be reduced, as compared to that of a conventional base, e.g., by limiting a number of electrical connections between audio plug 106 and modified base 107. In this manner, a thickness of case 102 need only be large enough to accommodate the reduced size of modified base 107, enabling reductions in the form-factor of case 102 as compared to conventional case designs.
It is understood that case 102 can be differently configured, depending on implementation. For example, case 102 can comprise additional (or fewer) body segments or portions. The position of plug 106 can also vary, depending on a form factor and/or layout of the mobile device for which case 102 is to be used. Similarly, the location of hardware components, (such as the integrated card reader) disposed within case 102 can vary with design. By way of example, a card reader (and associated plug) can be integrated into a different portion of case 102, such as body 102A.
In practice, body 102A is fitted around a mobile computing device, such as a tablet computer or smart phone device. Base 102B is then connected with body 102A to cover the remaining edge of the device. In the configuration illustrated by FIG. 1, modified base 107 is disposed within a bezel/rim of base 102B such that cooperation of base 102B with body 102A causes insertion of plug 106 into an audio port (e.g., headphone port) of the computing device. That is, the location on the rim/bezel of case 102 (e.g., on base 102B), corresponds with the location of the headphone port on the enclosed mobile device, such that cooperation of base 102B with body 102A causes insertion of plug 106 into the headphone port. In certain implementations, plug 106 is a protruding TRRS connector that can be received in a standard audio port, such as a female-type 3.5 mm headphone port.
FIG. 1B depicts case 102, as used in conjunction with a mobile computing device 108. In the example of FIG. 1B, case 102 is fitted around a back portion, and all sides of computing device 108. However, the form factor of case 102 can vary in other implementations.
In the illustrated configuration of FIG. 1B, protruding plug 106 (which is not visible) is inserted into computing device 108, e.g., to allow computing device 108 to fit within case 102. As shown, the complete fitting of case 102 onto computing device 108 requires the mechanical integration of base 102B with body 102A. Case 102 can include a single contiguous piece, rather than multiple portions such as body 102A and base 102B. In such arrangements, plug 106 can be configured so that it can turn or swivel with respect to case 102 in order to facilitate the insertion of plug 106 into a desired smart phone or tablet computing device, for example, when the device is fitted into case 102 at an angle. By way of example, plug 106 can be adapted to turn at an angle between 5 and 10 degrees with respect to case 102, e.g., to facilitate insertion of plug 106 into a corresponding audio port of the mobile device.
FIG. 1C depicts an end perspective view of case 102, according to some implementations. In this view, card slot 110 is illustrated, which can be used for receiving a financial payment card, e.g., to permit scanning/reading by a card reader disposed within case 102. Although the example of FIG. 1C places card slot 110 on the end of case 102, card slot 110 can be placed at different locations on case 102, depending on the desired configuration. For example, card slot 110 can be placed on a front side of case 102, such that an opening of the slot faces outward or upward relative to a direction of the mobile device screen.
As discussed in further detail below, slot 110 provides an aperture into which a payment card can be inserted for reading by card reader circuitry integrated into case 102. Various card reader circuitry implementations can be realized without departing from the scope of the technology. For example, slot 110 can be configured to receive a magnetic stripe payment card and to facilitate reading of the magnetic stripe payment card by the integrated card reader. In other implementations, slot 110 can be configured as a dip-slot and implemented to facilitate reading of an integrated circuit (IC) card by the reader circuitry, e.g., a financial payment card that conforms to the Europay MasterCard and Visa (EMV) global standard.
In practice, a financial payment card is received by slot 110 and read by an integrated card reader (not shown) within case 102. Subsequently, signaling based on the financial information of the payment card is provided to a mobile device, such as mobile computing device 108, for example, via a protruding plug that provides communicative connectivity between the card reader and the mobile computing device.
FIG. 2A illustrates an example of a plug assembly 200, including a modified base portion 210, according to some aspects of the technology. In the example, plug assembly 200 is configured according to a tip-ring-ring-sleeve (TRRS) standard, such as that used for some 3.5 mm audio plugs. Specifically, plug assembly 200 includes multiple conductive areas that correspond with different electrical channels of an audio bus. As illustrated, plug assembly 200 includes tip 202, first ring 204, second ring 206, and sleeve 208. In the example illustrated, tip 202 corresponds with a left audio channel, first ring 204 corresponds with a right audio channel, second ring 206 corresponds with an electrical ground, and sleeve 208 corresponds with a microphone channel. Although FIG. 2A illustrates plug assembly 200 with a TRRS configuration, it is understood that other wiring configurations, or plug geometries may be used, without departing from the scope of the subject technology.
In practice, plug 200 includes all of the conductive areas of a TRRS plug, however, only select regions provide electrical connectivity to a card reader via modified base 210. In the illustration of FIG. 2A, only second ring 206 and sleeve 208, are associated with electrical connections to modified base 210, e.g., via connection 208A and 206A, respectively. By reducing the number of electrical connections between modified base 210 and the protruding portion of TRRS plug 200, the form factor of modified base 210 can be reduced in size. As a result, a thickness of a surrounding case (e.g., case 102) can also be reduced. By way of example, in some implementations a thickness of case 102 can be reduced to approximately the height of modified base 210. Although the dimensions of modified base 210 may vary with implementation, in some aspects the height of modified base 210 may be approximately 7 mm, or less. In other implementations, the height of modified base may be approximately 6 mm.
FIG. 2B illustrates a cut-away view of an example plug (e.g., plug 200), with which various aspects of the technology can be implemented. Specifically, FIG. 2B illustrates various conductive regions of plug 200 (as also illustrated in FIG. 2A), namely tip 202, first ring 204, second ring 206, and sleeve 208. Additionally, FIG. 2B depicts insulation layers 205, 207 and 209, which function to electrically isolate the various conductive regions. In the example of FIG. 2B, insulation layer 205 isolates first ring 204 from second ring 206. Similarly, insulation layer 209 isolates second ring 206 from sleeve 208.
As discussed above with respect to FIG. 2A, in some implementations of a modified base (e.g., modified base 210), a fewer number of electrical connections are provided between conductive regions of plug 200. By way of example, electrical connections between second ring 206 and sleeve 208 are the only connections to modified base 210, for example, to enable a smaller profile for modified base 210. In some implementations, two or fewer electrical connections are provided between modified base 210 and plug 200. For example, in a plug of the subject technology, sleeve 208 can correspond with a microphone channel (e.g., in a 4-pole audio plug configuration), whereas second ring 206 can correspond with an electrical ground.
FIG. 2C illustrates an exterior view of a plug (e.g., plug 200) including a modified base (e.g., modified base 210), according to some implementations of the technology. As illustrated, plug 200 includes tip 202, first ring 204, second ring 206, and sleeve 208. FIG. 2C further illustrates the use of contact pads 206B and 208B on base 210, which are used to provide electrical connection between modified base 210 and conductive regions on plug 200. As discussed above with respect to FIG. 2A, contact pads 206B and 208B can be used to provide an electrical connection between modified base 210 and plug 200. That is, connection 206A connects contact pad 206B with sleeve 208. Likewise, connection 208A connects contact pad 208B with second ring 206.
By limiting the number of electrical connections that are provided between modified base 210 and plug 200, the width of modified base 210 can be reduced, for example, to accommodate a limited number of contact pads (e.g., contact pads 206B and 208B). It is understood that although the examples of FIGS. 2A-2C illustrate connections between modified base 210 and second ring 206 and sleeve 208, electrical connections can be formed with other regions of plug 200, depending on the desired implementation.
FIG. 3 depicts an example block diagram of hardware components used to implement card reader 300 of the subject technology. Card reader 300 includes microcontroller 310, memory 320, analog-to-digital converter (ADC) 330, modified base 340, media interface 360, and power supply 370. As illustrated, microcontroller 310 is coupled to memory 320, and ADC 330. Additionally, microcontroller 310 is coupled to modified base 340, as well as media interface 360, either directly or via ADC 330. In turn, modified base 340 is coupled to a microphone channel and a ground connection. The microphone and ground connection can provide electrical/communicative contact with a protruding plug, such as a TRRS connector, for example, that is configured for insertion into the headphone port of a mobile computing device.
It is understood that reader device 300 can be implemented using various other hardware components and/or configurations, and is not limited to the architecture depicted in FIG. 3. By way of example, microcontroller 310 can be implemented using a general-purpose processor, a microcontroller, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA), a programmable logic device (PLD), a controller, a state machine, gated logic, discrete hardware components, or a combination of the foregoing.
Memory 320 can include various types of memories, including working memory in the form of random-access memory (RAM) 324 and read-only memory (ROM) 322. Additionally, various types of memory can be utilized in place of, or in addition to, memory 320. For example, the one or more sequences of instructions for operating the reader device 300 can be stored as software or firmware in a ROM 312 within microcontroller 310 or in the ROM 322 within memory 320. One or more sequences of instructions can also be software stored and read from another storage medium, such as the flash memory array, or received from the host computing device (e.g., a mobile device such as a smart phone or tablet computing device) via a host interface. ROM, storage mediums, and flash memory arrays represent examples of machine or computer readable media storing instructions/code executable by microcontroller 310. Machine or computer readable media may generally refer to any medium or media used to provide instructions to microcontroller 310, including both volatile media, such as dynamic memory used for storage media or for buffers within microcontroller 310, and non-volatile media, such as electronic media, optical media, and magnetic media.
Media interface 360 can form a device, or portion thereof, for reading media located on credit cards, debit cards, or objects to obtain payment information. In some implementations, the media interface 360 can be configured to read information from a physical storage medium, such as magnetic storage media (e.g., magnetic stripe media), optical storage media (e.g., barcodes or patterns), radio-frequency identification (RFID) storage devices, and integrated circuit card media (e.g., smart chip technologies), to name a few. Alternatively or in addition to the capability of reading such passive media, the media interface 360 can also be configured in some implementations to provide a wireless or wireline interface for interacting with other devices to provide such payment information.
FIG. 4 illustrates an example environment in which a case and card reader may be used. It will be apparent that the components portrayed in FIG. 4 can be arbitrarily combined or divided into separate software, firmware and/or hardware components. Furthermore, it will also be apparent that such components, regardless of how they are combined or divided, can execute on the same host or multiple hosts, and wherein multiple hosts can be connected by one or more networks.
In the example of FIG. 4, the system includes a mobile device 400, a reader 401 connected to mobile device 400, a decoding engine 410, a user interaction engine 420, and a transaction engine 430, all running on mobile device 400. Additionally, the system may also include one or more of a user database 440, a product or service database 450, and a transaction database 460, all coupled to the transaction engine 430.
Consistent with aspects of the subject technology, reader 401 can be physically integrated into a case, such as that discussed above with respect to FIGS. 1A-C, which contains or surrounds mobile device 400.
As used herein, the term engine can refer to software, firmware, hardware, and/or other components used to effectuate a purpose. The engine will typically include software instructions that are stored in non-volatile memory (also referred to as secondary memory). When the software instructions are executed, at least a subset of the software instructions is loaded into memory (also referred to as primary memory) by a processor. The processor then executes the software instructions in memory. The processor may be a shared processor, a dedicated processor, or a combination of shared or dedicated processors. A typical program will include calls to hardware components (such as I/O devices), which typically requires the execution of drivers. The drivers may or may not be considered part of the engine, but the distinction is not critical.
As used herein, the term database is used broadly to include any known or convenient means for storing data, whether centralized or distributed, relational or otherwise.
In the example of FIG. 4, mobile device 400 to which reader 401 is connected can be, but is not limited to, a cell phone, such as Apple's iPhone, other portable electronic devices, such as Apple's iPod Touches, Apple's iPads, and mobile devices based on Google's Android operating system and any other portable electronic device that includes software, firmware, hardware, or any combination capable of at least receiving the signal, decoding if needed, exchanging information with a transaction server to verify the buyer and/or seller's account information, conducting the transaction, and generating a receipt. Typical components of mobile device 400 can include but are not limited to persistent memories like flash ROM, random access memory like SRAM, a camera, a battery, LCD driver, a display, a cellular antenna, a speaker, a Bluetooth circuit, and WiFi circuitry, where the persistent memory may contain programs, applications, and/or an operating system for the mobile device.
In some implementations, a system is provided with transaction engine 430 running on mobile device 400. In response to a financial transaction between a buyer and a seller, mobile device 400 accepts information selected including but not limited to information from financial transaction or information pertaining to financial transaction card used by the buyer in the transaction. Additionally, a financial transaction device can be utilized, Non-limiting examples of financial transaction devices include but are not limited to a, wristband, RFID chip, cell phone, biometric marker and the like. At least a portion of this information is communicated with a third party financial institution or payment network to authorize the transaction.
Payment confirmation can be made with a communication channel of the buyer's choice. As non-limiting examples, confirmation of payment can be an electronic notification in the form selected from at least one of, email, SMS message, tweet (message delivered via Twitter), instant message, communication within a social network and the like. In response to the transaction, a confirmation is made that the buyer is authorized to use the financial transaction card. In certain implementations, a confirmation can be provided that indicates a sufficiency of funds available to the buyer.
In the example of FIG. 4, reader 401 is configured to read data encoded in a magnetic strip of a card being swiped by a buyer and send a signal that corresponds to the data read to mobile device 400. However, as discussed above, reader 401 may be configured to receive various payment card types, including but not limited to IC cards that can be provided to reader 401 using a dip-slot.
The size of reader 401 can be miniaturized to be portable for connection with mobile device 400. For example, the size of card reader 401 can be miniaturized to an overall length of less than 1.5′′. In addition, the miniaturized card reader 401 is also designed to reliably read the card with minimum error via a single swipe by counteracting vendor specific filtering done by mobile device 401. Note that this broad overview is meant to be non-limiting as components to this process are represented in different embodiments.
Many of the above-described features and applications are implemented as software processes that are specified as a set of instructions recorded on a computer readable storage medium (also referred to as computer readable medium). When these instructions are executed by one or more processing unit(s) (e.g., one or more processors, cores of processors, or other processing units), they cause the processing unit(s) to perform the actions indicated in the instructions. Examples of computer readable media include, but are not limited to, flash drives, RAM chips, hard drives, EPROMs, etc. The computer readable media does not include carrier waves and electronic signals passing wirelessly or over wired connections.
In this specification, the term “software” is meant to include firmware residing in read-only memory or applications stored in magnetic storage, which can be read into memory for processing by a processor. Also, in some implementations, multiple software aspects of the subject disclosure can be implemented as sub-parts of a larger program while remaining distinct software aspects of the subject disclosure. In some implementations, multiple software aspects can also be implemented as separate programs. Finally, any combination of separate programs that together implement a software aspect described here is within the scope of the subject disclosure. In some implementations, the software programs, when installed to operate on one or more electronic systems, define one or more specific machine implementations that execute and perform the operations of the software programs.
A computer program (also known as a program, software, software application, script, or code) can be written in any form of programming language, including compiled or interpreted languages, declarative or procedural languages, and it can be deployed in any form, including as a stand-alone program or as a module, component, subroutine, object, or other unit suitable for use in a computing environment. A computer program may, but need not, correspond to a file in a file system. A program can be stored in a portion of a file that holds other programs or data (e.g., one or more scripts stored in a markup language document), in a single file dedicated to the program in question, or in multiple coordinated files (e.g., files that store one or more modules, sub programs, or portions of code). A computer program can be deployed to be executed on one computer or on multiple computers that are located at one site or distributed across multiple sites and interconnected by a communication network.
These functions described above can be implemented in digital electronic circuitry, in computer software, firmware or hardware. The techniques can be implemented using one or more computer program products. Programmable processors and computers can be included in or packaged as mobile devices. The processes and logic flows can be performed by one or more programmable processors and by one or more programmable logic circuitry. General and special purpose computing devices and storage devices can be interconnected through communication networks.
Some implementations include electronic components, such as microprocessors, storage and memory that store computer program instructions in a machine-readable or computer-readable medium (alternatively referred to as computer-readable storage media, machine-readable media, or machine-readable storage media). Some examples of such computer-readable media include RAM, ROM, flash memory (e.g., SD cards, mini-SD cards, micro-SD cards, etc.), magnetic and/or solid state hard drives, read-only and recordable Blu-Ray® discs, ultra density optical discs, any other optical or magnetic media. The computer-readable media can store a computer program that is executable by at least one processing unit, such as a microcontroller, and includes sets of instructions for performing various operations. Examples of computer programs or computer code include machine code, such as is produced by a compiler, and files including higher-level code that are executed by a computer, an electronic component, or a microprocessor using an interpreter.
While the above discussion primarily refers to microprocessor or multi-core processors that execute software, some implementations are performed by one or more integrated circuits, such as application specific integrated circuits (ASICs) or field programmable gate arrays (FPGAs). In some implementations, such integrated circuits execute instructions that are stored on the circuit itself.
As used in this specification and any claims of this application, the terms “computer”, “server”, “processor”, and “memory” all refer to electronic or other technological devices. These terms exclude people or groups of people. For the purposes of the specification, the terms display or displaying means displaying on an electronic device. As used in this specification and any claims of this application, the terms “computer readable medium” and “computer readable media” are entirely restricted to tangible, physical objects that store information in a form that is readable by a computer. These terms exclude any wireless signals, wired download signals, and any other ephemeral signals.
Embodiments of the subject matter described in this specification can be implemented in a computing system that includes a back end component, e.g., as a data server, or that includes a middleware component, e.g., an application server, or that includes a front end component, e.g., a client computer having a graphical user interface or a Web browser through which a user can interact with an implementation of the subject matter described in this specification, or any combination of one or more such back end, middleware, or front end components. The components of the system can be interconnected by any form or medium of digital data communication, e.g., a communication network. Examples of communication networks include a local area network (“LAN”) and a wide area network (“WAN”), an inter-network (e.g., the Internet), and peer-to-peer networks (e.g., ad hoc peer-to-peer networks).
The computing system can include clients and servers. A client and server are generally remote from each other and typically interact through a communication network. The relationship of client and server arises by virtue of computer programs running on the respective computers and having a client-server relationship to each other. In some embodiments, a server transmits data (e.g., an HTML page) to a client device (e.g., for purposes of displaying data to and receiving user input from a user interacting with the client device). Data generated at the client device (e.g., a result of the user interaction) can be received from the client device at the server.
It is understood that any specific order or hierarchy of steps in the processes disclosed is an illustration of exemplary approaches. Based upon design preferences, it is understood that the specific order or hierarchy of steps in the processes may be rearranged, or that all illustrated steps be performed. Some of the steps may be performed simultaneously. For example, in certain circumstances, multitasking and parallel processing may be advantageous. Moreover, the separation of various system components in the embodiments described above should not be understood as requiring such separation in all embodiments, and it should be understood that the described program components and systems can generally be integrated together in a single software product or packaged into multiple software products.
The previous description is provided to enable any person skilled in the art to practice the various aspects described herein. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other aspects. Thus, the claims are not intended to be limited to the aspects shown herein, but are to be accorded the full scope consistent with the language claims, wherein reference to an element in the singular is not intended to mean “one and only one” unless specifically so stated, but rather “one or more.” Unless specifically stated otherwise, the term “some” refers to one or more. Pronouns in the masculine (e.g., his) include the feminine and neuter gender (e.g., her and its) and vice versa. Headings and subheadings, if any, are used for convenience only and do not limit the subject disclosure.
A phrase such as an “aspect” does not imply that such aspect is essential to the subject technology or that such aspect applies to all configurations of the subject technology. A disclosure relating to an aspect may apply to all configurations, or one or more configurations. A phrase such as an aspect may refer to one or more aspects and vice versa. A phrase such as a “configuration” does not imply that such configuration is essential to the subject technology or that such configuration applies to all configurations of the subject technology. A disclosure relating to a configuration may apply to all configurations, or one or more configurations. A phrase such as a configuration may refer to one or more configurations and vice versa.
The word “exemplary” is used herein to mean “serving as an example or illustration.” Any aspect or design described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other aspects or designs.
All structural and functional equivalents to the elements of the various aspects described throughout this disclosure that are known or later come to be known to those of ordinary skill in the art are expressly incorporated herein by reference and are intended to be encompassed by the claims. Moreover, nothing disclosed herein is intended to be dedicated to the public regardless of whether such disclosure is explicitly recited in the claims.

## Claims

1. A point of sale system comprising a mobile computing device running transaction processing software and having a headphone port, and a case for enclosing the mobile computing device, the case comprising:
a body portion;
a base portion configured to interface with the body portion to collectively enclose the mobile computing device;
a reader disposed within the base portion and configured for reading financial information from a payment card; and
a tip-ring-ring-sleeve (TRRS) connector configured to be received within the headphone port of the mobile computing device and to transmit data from the reader to the transaction processing software of the mobile device, the TRRS connector having a protruding portion and a modified base portion:
the protruding portion protruding from the base portion of the case and being adapted to be received within the headphone port of the mobile device, the protruding portion having four potential points of electrical contact with the mobile device,
the modified base portion of the TRRS connector being housed within the base portion of the case, and wherein the modified base portion of the TRRS connector provides not more than two electrical connections between the TRRS connector and the reader, thereby the modified base portion takes up less space within the base portion of the case allowing the base portion of the case to be slimmer than a case enclosing a TRRS connector base portion providing more than two electrical connections between the TRRS connector and the reader.

2. The point of sale system of claim 1, wherein the modified base portion comprises a first electrical connection and a second electrical connection to the protruding portion of the TRRS connector, the first electrical connection and the second electrical connection respectively corresponding with a microphone channel and a ground connection of the microphone port.

3. The point of sale system of claim 1, wherein the card slot is configured to receive a magnetic stripe payment card.

4. The point of sale system of claim 1, wherein the card slot is configured to receive an integrated circuit (IC) payment card.

5. The point of sale system of claim 1, wherein the protruding portion of the TRRS connector is configured to conform to one or more TRRS connector standard configurations.

6. The point of sale system of claim 1, wherein the card slot is configured to facilitate mechanical contact between the payment card and a read head of the reader.

7. A mobile point of sale (POS) terminal, comprising:
a mobile device comprising an audio port;
a case mechanically disposed around the mobile device, the case comprising:
a reader configured for reading financial information from a payment card;
a card slot configured to receive the payment card and for facilitating contact between the payment card and the reader, and
wherein the card reader comprises an audio jack having a protruding portion and a base portion, the protruding portion adapted to be received by the audio port of the mobile device, and wherein the base portion provides not more than two electrical connections between the audio jack and the audio port.

8. The mobile POS terminal of claim 7, wherein the audio jack comprises a tip-ring-ring-sleeve (TRRS) connector.

9. The mobile POS terminal of claim 7, wherein the audio port is a headphone port.

10. The mobile POS terminal of claim 7, wherein the card slot is configured to receive a magnetic stripe payment card.

11. The mobile POS terminal of claim 7, wherein the card slot is configured to receive an integrated circuit (IC) payment card.

12. The mobile POS terminal of claim 7, wherein the audio jack is configured to conform to one or more TRRS connector standard configurations.

13. The mobile POS terminal of claim 7, wherein the reader is configured to transmit the financial information from the payment card to the mobile device to facilitate a financial transaction between a buyer and a seller.

14. A mobile reader, comprising:
a read head embedded in a case configured to enclose a mobile computing device, wherein the read head is electrically coupled to a tip-ring-ring sleeve (TRRS) connector, and
wherein the TRRS connector comprises a protruding portion and a modified base portion, the protruding portion adapted to be received by a headphone port of a mobile device, and
wherein the modified base portion provides not more than two electrical connections between the TRRS connector and the mobile reader.

15. The mobile reader of claim 14, wherein the modified base portion comprises a first electrical connection and a second electrical connection to the protruding portion of the TRRS connector, the first electrical connection and the second electrical connection respectively corresponding with a microphone channel and a ground connection of the headphone port.

16. The mobile reader of claim 14, wherein the read head is configured to receive data from a magnetic stripe payment card.

17. The mobile reader of claim 14, wherein the read head is configured to receive data from an integrated circuit (IC) payment card.

18. The mobile reader of claim 14, wherein the protruding portion of the TRRS connector is configured to conform to one or more TRRS connector standard configurations.

19. The mobile reader of claim 14, wherein the case comprises a card slot configured to receive a magnetic stripe payment card.

20. The mobile reader of claim 14, wherein the case comprises a dip-slot configured to receive an integrated (IC) payment card.