Patent Application
20160291956
This invention generally relates to electronic devices.
Input devices such as imaging sensors and touch screens are used in a variety of devices including, but not limited to, cell phones, tablet computers, laptop computers, monitors, televisions, handheld gaming devices, and many other devices. Inputs devices are able to detect a large variety of inputs, and use that information to perform many different functions. One such input may be received from an active pen.
In general, in one aspect, embodiments of the invention relate to an active pen. The active pen comprises: a receiver configured to obtain a plurality of a reprogramming instructions from a reprogramming device; and a controller configured to modify software of the active pen based on the plurality of reprogramming instructions.
In general, in one aspect, embodiments of the invention relate to a reprogramming device for reprogramming an active pen. The reprogramming device comprises: a reprogramming module configured to obtain a plurality of reprogramming instructions for the active pen; and an output device configured to transmit the plurality of reprogramming instructions to the active pen to modify software of the active pen.
In general, in one aspect, embodiments of the invention relate to a method of reprogramming an active pen. The method comprises: obtaining, by a reprogramming device, a plurality of reprogramming instructions; and transmitting, by the reprogramming device, the plurality of instructions to the active pen, wherein the plurality of instructions are received by a sensor on the active pen, and wherein the plurality of instructions modify software of the active pen.
Other aspects of the invention will be apparent from the following description and the appended claims.
The following detailed description is merely exemplary in nature and is not intended to limit the invention or the application and uses of the invention. Furthermore, there is no intention to be bound by any expressed or implied theory presented in the preceding technical field, background, brief summary or the following detailed description.
In the following detailed description of embodiments of the invention, numerous specific details are set forth in order to provide a more thorough understanding of the invention. However, it will be apparent to one of ordinary skill in the art that the invention may be practiced without these specific details. In other instances, well-known features have not been described in detail to avoid unnecessarily complicating the description.
Throughout the application, ordinal numbers (e.g., first, second, third, etc.) may be used as an adjective for an element (i.e., any noun in the application). The use of ordinal numbers is not to imply or create any particular ordering of the elements nor to limit any element to being only a single element unless expressly disclosed, such as by the use of the terms “before”, “after”, “single”, and other such terminology. Rather, the use of ordinal numbers is to distinguish between the elements. By way of an example, a first element is distinct from a second element, and the first element may encompass more than one element and succeed (or precede) the second element in an ordering of elements.
Various embodiments of the present invention provide input devices and methods that facilitate improved usability.
Turning now to the figures,
The input device (100) may be implemented as a physical part of the electronic system, or may be physically separate from the electronic system. Further, portions of the input device (100) as part of the electronic system. For example, all or part of the determination module may be implemented in the device driver of the electronic system. As appropriate, the input device (100) may communicate with parts of the electronic system using any one or more of the following: buses, networks, and other wired or wireless interconnections. Examples include I2C, SPI, PS/2, Universal Serial Bus (USB), Bluetooth, RF, and IRDA.
In
The sensing region (120) encompasses any space above, around, in and/or near the input device (100) in which the input device (100) is able to detect user input (e.g., user input provided by one or more input objects). The sizes, shapes, and locations of particular sensing regions may vary widely from embodiment to embodiment.
In some embodiments, the sensing region (120) extends from a surface of the input device (100) in one or more directions into space until signal-to-noise ratios prevent sufficiently accurate object detection. The extension above the surface of the input device may be referred to as the above surface sensing region. The distance to which this sensing region (120) extends in a particular direction, in various embodiments, may be on the order of less than a millimeter, millimeters, centimeters, or more, and may vary significantly with the type of sensing technology used and the accuracy desired. Thus, some embodiments sense input that comprises no contact with any surfaces of the input device (100), contact with an input surface (e.g. a touch surface) of the input device (100), contact with an input surface of the input device (100) coupled with some amount of applied force or pressure, and/or a combination thereof. In various embodiments, input surfaces may be provided by surfaces of casings within which the sensor electrodes reside, by face sheets applied over the sensor electrodes or any casings, etc. In some embodiments, the sensing region (120) has a rectangular shape when projected onto an input surface of the input device (100).
The input device (100) may utilize any combination of sensor components and sensing technologies to detect user input in the sensing region (120). The input device (100) includes one or more sensing elements for detecting user input. As several non-limiting examples, the input device (100) may use capacitive, elastive, resistive, inductive, magnetic, acoustic, ultrasonic, and/or optical techniques.
Some implementations are configured to provide images that span one, two, three, or higher dimensional spaces. Some implementations are configured to provide projections of input along particular axes or planes. Further, some implementations may be configured to provide a combination of one or more images and one or more projections.
In some resistive implementations of the input device (100), a flexible and conductive first layer is separated by one or more spacer elements from a conductive second layer. During operation, one or more voltage gradients are created across the layers. Pressing the flexible first layer may deflect it sufficiently to create electrical contact between the layers, resulting in voltage outputs reflective of the point(s) of contact between the layers. These voltage outputs may be used to determine positional information.
In some inductive implementations of the input device (100), one or more sensing elements pick up loop currents induced by a resonating coil or pair of coils. Some combination of the magnitude, phase, and frequency of the currents may then be used to determine positional information.
In some capacitive implementations of the input device (100), voltage or current is applied to create an electric field. Nearby input objects cause changes in the electric field, and produce detectable changes in capacitive coupling that may be detected as changes in voltage, current, or the like.
Some capacitive implementations utilize arrays or other regular or irregular patterns of capacitive sensing elements to create electric fields. In some capacitive implementations, separate sensing elements may be ohmically shorted together to form larger sensor electrodes. Some capacitive implementations utilize resistive sheets, which may be uniformly resistive.
Some capacitive implementations utilize “self capacitance” (or “absolute capacitance”) sensing methods based on changes in the capacitive coupling between sensor electrodes and an input object. In various embodiments, an input object near the sensor electrodes alters the electric field near the sensor electrodes, thus changing the measured capacitive coupling. In one implementation, an absolute capacitance sensing method operates by modulating sensor electrodes with respect to a reference voltage (e.g., system ground), and by detecting the capacitive coupling between the sensor electrodes and input objects. The reference voltage may by a substantially constant voltage or a varying voltage and in various embodiments; the reference voltage may be system ground. Measurements acquired using absolute capacitance sensing methods may be referred to as absolute capacitive measurements.
Some capacitive implementations utilize “mutual capacitance” (or “trans capacitance”) sensing methods based on changes in the capacitive coupling between sensor electrodes. In various embodiments, an input object near the sensor electrodes alters the electric field between the sensor electrodes, thus changing the measured capacitive coupling. In one implementation, a mutual capacitance sensing method operates by detecting the capacitive coupling between one or more transmitter sensor electrodes (also “transmitter electrodes” or “transmitter”) and one or more receiver sensor electrodes (also “receiver electrodes” or “receiver”). Transmitter sensor electrodes may be modulated relative to a reference voltage (e.g., system ground) to transmit transmitter signals. Receiver sensor electrodes may be held substantially constant relative to the reference voltage to facilitate receipt of resulting signals. The reference voltage may by a substantially constant voltage and in various embodiments; the reference voltage may be system ground. In some embodiments, transmitter sensor electrodes may both be modulated. The transmitter electrodes are modulated relative to the receiver electrodes to transmit transmitter signals and to facilitate receipt of resulting signals. A resulting signal may include effect(s) corresponding to one or more transmitter signals, and/or to one or more sources of environmental interference (e.g. other electromagnetic signals). The effect(s) may be the transmitter signal, a change in the transmitter signal caused by one or more input objects and/or environmental interference, or other such effects. Sensor electrodes may be dedicated transmitters or receivers, or may be configured to both transmit and receive. Measurements acquired using mutual capacitance sensing methods may be referred to as mutual capacitance measurements.
Further, the sensor electrodes may be of varying shapes and/or sizes. The same shapes and/or sizes of sensor electrodes may or may not be in the same groups. For example, in some embodiments, receiver electrodes may be of the same shapes and/or sizes while, in other embodiments, receiver electrodes may be varying shapes and/or sizes.
In
The processing system (110) may be implemented as a set of modules that handle different functions of the processing system (110). Each module may include circuitry that is a part of the processing system (110), firmware, software, or a combination thereof. In various embodiments, different combinations of modules may be used. For example, as shown in
The sensor module (160) may include functionality to drive the sensing elements to transmit transmitter signals and receive the resulting signals. For example, the sensor module (160) may include sensory circuitry that is coupled to the sensing elements. The sensor module (160) may include, for example, a transmitter module and a receiver module. The transmitter module may include transmitter circuitry that is coupled to a transmitting portion of the sensing elements. The receiver module may include receiver circuitry coupled to a receiving portion of the sensing elements and may include functionality to receive the resulting signals.
Although
In some embodiments, the processing system (110) responds to user input (or lack of user input) in the sensing region (120) directly by causing one or more actions. Example actions include changing operation modes, as well as graphical user interface (GUI) actions such as cursor movement, selection, menu navigation, and other functions. In some embodiments, the processing system (110) provides information about the input (or lack of input) to some part of the electronic system (e.g. to a central processing system of the electronic system that is separate from the processing system (110), if such a separate central processing system exists). In some embodiments, some part of the electronic system processes information received from the processing system (110) to act on user input, such as to facilitate a full range of actions, including mode changing actions and GUI actions.
For example, in some embodiments, the processing system (110) operates the sensing element(s) of the input device (100) to produce electrical signals indicative of input (or lack of input) in the sensing region (120). The processing system (110) may perform any appropriate amount of processing on the electrical signals in producing the information provided to the electronic system. For example, the processing system (110) may digitize analog electrical signals obtained from the sensor electrodes. As another example, the processing system (110) may perform filtering or other signal conditioning. As yet another example, the processing system (110) may subtract or otherwise account for a baseline, such that the information reflects a difference between the electrical signals and the baseline. As yet further examples, the processing system (110) may determine positional information, recognize inputs as commands, recognize handwriting, and the like.
“Positional information” as used herein broadly encompasses absolute position, relative position, velocity, acceleration, and other types of spatial information. Exemplary “zero-dimensional” positional information includes near/far or contact/no contact information. Exemplary “one-dimensional” positional information includes positions along an axis. Exemplary “two-dimensional” positional information includes motions in a plane. Exemplary “three-dimensional” positional information includes instantaneous or average velocities in space. Further examples include other representations of spatial information. Historical data regarding one or more types of positional information may also be determined and/or stored, including, for example, historical data that tracks position, motion, or instantaneous velocity over time.
In some embodiments, the input device (100) is implemented with additional input components that are operated by the processing system (110) or by some other processing system. These additional input components may provide redundant functionality for input in the sensing region (120), or some other functionality.
In some embodiments, the input device (100) includes a touch screen interface, and the sensing region (120) overlaps at least part of an active area of a display screen. For example, the input device (100) may include substantially transparent sensor electrodes overlaying the display screen and provide a touch screen interface for the associated electronic system. The display screen may be any type of dynamic display capable of displaying a visual interface to a user, and may include any type of light emitting diode (LED), organic LED (OLED), cathode ray tube (CRT), liquid crystal display (LCD), plasma, electroluminescence (EL), or other display technology. The input device (100) and the display screen may share physical elements. For example, some embodiments may utilize some of the same electrical components for displaying and sensing. In various embodiments, one or more display electrodes of a display device may configured for both display updating and input sensing. As another example, the display screen may be operated in part or in total by the processing system (110).
It should be understood that while many embodiments of the invention are described in the context of a fully functioning apparatus, the mechanisms of the present invention are capable of being distributed as a program product (e.g., software) in a variety of forms. For example, the mechanisms of the present invention may be implemented and distributed as a software program on information bearing media that are readable by electronic processors (e.g., non-transitory computer-readable and/or recordable/writable information bearing media that is readable by the processing system (110)). Additionally, the embodiments of the present invention apply equally regardless of the particular type of medium used to carry out the distribution. For example, software instructions in the form of computer readable program code to perform embodiments of the invention may be stored, in whole or in part, temporarily or permanently, on a non-transitory computer readable storage medium. Examples of non-transitory, electronically readable media include various discs, physical memory, memory, memory sticks, memory cards, memory modules, and or any other computer readable storage medium. Electronically readable media may be based on flash, optical, magnetic, holographic, or any other storage technology.
Although not shown in
While
As discussed above, the active pen (140) is an example of an input object. The active pen (140) may have one or more features including button(s), display(s), a tip force sensor, batteries, various instruments to measure motion of the active pen (140), etc. Some of the features (e.g., buttons) may be selected/operated by the user of the active pen (140). Some of the features (e.g., displays) may be used to present information to the user of the active pen (140). Some of the features (e.g., instruments of measure motion, tip force sensor) may be used to collect data on how the user is handling the active pen (140).
In some embodiments, the active pen (140) is configured to assemble a set of bits. The set of bits may represent multiple concatenated fields, with each field storing a value corresponding to a feature (e.g., button, display, tip force sensor, etc.) or a custom value. For example, one field may store a value indicating that a button on the active pen (140) has been selected by the user. Another field may store a value indicating the force at the tip of the active pen (140) (i.e., whether the user is pressing the pen firmly or lightly against a surface). In some embodiments, the set always starts with a predefined starting sequence and/or includes error detecting or error correcting codes.
In one or more embodiments, the active pen (140) may assemble multiple different sets of bits. One set of bits may be assembled when the active pen (140) determines that it is in contact with a surface. This set of bits may be referred to as a contact packet. In one or more embodiments, a second set of bits may be assembled when the pen is in “hover mode,” meaning that the pen is in use but not touching a surface with the tip of the pen. In some embodiments, “hover mode” may comprise the active pen (140) being in the sensing region (120), but not in physical contact with a surface in the sensing region (120). The hover packet may be shorter than the contact packet. It will be apparent to one of ordinary skill in the art that there are many ways to assemble and organize data to be sent by the active pen (140) and, as such, the invention should not be limited to the above examples.
In one or more embodiments, the active pen (140) is configured to transmit sets of bits. Specifically, the active pen (140) may use the set of bits as a data signal to modulate a carrier signal(s), and then transmit the resulting modulated carrier signal(s). The same set of bits may be retransmitted over and over. For example, the active pen (140) may modulate a carrier signal accordingly to the frequency shift keying (FSK) modulation scheme. Other modulation schemes (e.g., Amplitude Shift Keying (ASK), Quadrature Amplitude Modulation (QAM), etc.) may also be used. In one or more embodiment, the set of bits are encoded (e.g., using the Manchester encoding scheme) prior to modulating the carrier signal(s).
In one or more embodiments, the input device system (100) includes one or more sensing elements to receive/intercept/detect RF waves. In other words, the sensing elements are effectively antennas. As discussed above, the received RF waves may correspond to signals transmitted by the active pen (140). Multiple sensor elements may receive the same modulated carrier signal but with different strengths. These various signal strengths and/or the data transmitted in the modulated carrier signal may be used to determine positional information.
Those skilled in the art, having the benefit of this detailed description, will appreciate that the type/content of data that is transmitted by the active pen (140), the encoding scheme used to encode the data, the modulation scheme used to transmit the data, the function of the buttons on the active pen (140), the messages presented on the display of the active pen (140), etc. are controlled, at least in part, by software executing on the active pen (140). This software may be initially installed by the manufacturer of the active pen (140). However, at a future time, there may be a need to update the software. For example, the manufacturer of the active pen (140) or a third-party may release an updated version of the software. Additionally or alternatively, a user may wish to install custom software on the active pen (140) and/or change an operating parameter of the active pen (140). Although the disclosed embodiments have used the term “software,” those skilled in the art, having the benefit of this detailed description, will appreciate that “software” includes firmware, binary code, machine code, and computing/programming code of any type in any format.
In one or more embodiments, the processing system (110) includes a reprogramming module (152) and one or more output devices (e.g., speaker (114), socket (118), display screen (155)). The reprogramming module (152) is configured to obtain reprogramming instructions for modifying the software executing on the active pen (140). For example, the reprogramming instructions may be downloaded from a website. As another example, the reprogramming instructions may be read from a flash drive (not shown) or other storage device connected to the reprogramming module (152). The reprogramming instructions may be intended to replace all of the software or only a code segment of the software executing on the active pen (140). One or more of the output devices (114, 118, 155) are configured to transmit the reprogramming instructions to the active pen (140). In one or more embodiments, the input device (100) may be referred to as a reprogramming device. In one or more embodiments, the reprogramming module (152) and the output device(s) (114, 118, 155) may be located on a device that is separate from the input device (100). This separate device may also be referred to as a reprogramming device.
In one or more embodiments, the input device (100) includes a speaker (114). The speaker (114) is configured to generate acoustic (i.e., pressure) waves based on the reprogramming instructions. Specifically, the acoustic waves are used to transmit the reprogramming instructions to the active pen (140) (discussed below).
In one or more embodiments, the input device (100) includes a socket (118). The socket (118) may be designed to accommodate an audio jack (e.g., ⅛″ audio jack, 1/16″ audio jack, etc.). The reprogramming module (152) may transmit the reprogramming instructions to the active pen (140) over an audio cable ending with an audio jack plugged in to the socket (118) (discussed below). In such scenarios, the reprogramming instructions may be used to modulate a carrier signal, and it is this modulated signal that is transmitted over the audio cable to the active pen (140). Various modulation schemes (e.g., Amplitude Shift Keying (ASK), Frequency Shift Keying (FSK), Quadrature Amplitude Modulation (QAM), etc.) may be used to generate the modulated signal. In one or more embodiments, the transmitted signal corresponds to a stereo audio signal, with the left channel and the right channel being used for different information. For example, one channel may encode data while the other channel may encode a clock. As another example, both channels may encode data effectively doubling the bit rate.
In one or more embodiments, the input device (100) includes a display screen (155). The display screen (155) may be a touchscreen. The display screen (155) may partially or fully overlap with the sensing region (120). The reprogramming module (152) may transmit the reprogramming instructions to the active pen (140) using light emitted by the display screen (155). For example, the display screen (155) may be modulated to in order to send binary information. In other words, the reprogramming module (152) may cause the display screen (155) to flash pulses of light in order to transmit the reprogramming instructions to the active pen (140). These pulses may be transmitted using one or more light levels (i.e., one or more intensities), one or more durations, and one or more colors. Different colors, different pulse durations, and/or different intensities may be used to encode different information (e.g., different bits or bit sequences). Additionally or alternatively to visible light, ultraviolet (UV) light and/or infrared (IR) may be used to transmit the reprogramming instructions.
In one or more embodiments, different portions of the display screen (155) may be simultaneously used to transmit different parts of the reprogramming instructions to the active pen (i.e., parallel communication). In one or more embodiments, only one portion of the display screen (155) is used to transmit the reprogramming instructions to the active pen (140). In such embodiments, the portion of the display screen (155) may be located directly below the active pen (140). For example, the display screen (155) may be divided into four quadrants and only the quadrant making contact with the active pen (140) (e.g., the user may be writing with the active pen) is used to transmit the reprogramming instructions. The remaining three quadrants may be used to display other material to the user while the one quadrant is transmitting the reprogramming instructions. In other embodiments, the reprogramming module (152) may be configured to transmit reprogramming instructions at the location of the active pen (140), and change the portion of the display that is transmitting reprogramming instructions as the active pen (140) moves relative to the display screen (155). For example, a small portion of the display screen may transmit reprogramming instructions, and the small portion that is transmitting may follow the active pen (140) as the active pen (140) moves across the screen. In this manner, the portion of the display that is used for transmitting reprogramming instructions is limited, while still successfully transmitting instructions even as the active pen (140) moves.
Although some output devices have been discussed (e.g., speaker (114), socket (118), and display screen (155)), those skilled in the art, having the benefit of this detailed description, will appreciate that the input device (100) may use antennae, fiber optics, and/or any other communication means to transmit the reprogramming instructions to the active pen (140).
In one or more embodiments of the invention, the active pen (240) includes the receiver (222). The receiver (222) is configured to receive the reprogramming instructions that are transmitted by the output device (e.g., speaker (114), socket (118), display screen (155)), discussed above in reference to
For example, in the case of acoustic waves, the sensor(s) may be a force gauge and/or a microphone that is actuated by the acoustic waves. The tip (229) of the active pen (240) may need to be placed against the speaker (114) for the transmission to take place. As another example, in the case of electromagnetic signals over an audio cable, the sensor(s) may be a socket for an audio jack (e.g., ⅛″ audio jack, 1/16″ audio jack, etc.). As yet another example, in the case of light emitted from the display screen (155), the sensor(s) may be a photo-receiver or other optical detector (e.g., photo-diode, photo-transistor, photo cell, etc.) which generates an electrical signal that is a function of the detected light. The one or more sensors may be placed along the body of the active pen (240). Additionally or alternatively, the one or more sensors may be placed within the tip (229) of the active pen (240). In one or more embodiments, the sensor(s) is a light emitting diode (LED) on the exterior of the active pen (240) that was previously used as an indicator and has been repurposed to act as an optical detector.
In one or more embodiments of the invention, the receiver (222) includes circuitry and/or circuit components (e.g., analog-to-digital (A/D) converters, comparators, amplifiers, decoders, error correction code (ECC) blocks, etc.) to extract (e.g., demodulate, decode, etc.) the reprogramming instructions from the format in which the reprogramming instructions were transmitted. Although the receiver (222) is shown as a single block in
In one or more embodiments, the active pen (240) includes the controller (224). The controller (224) is a processor or micro-processor that executes the software (225). As discussed above, the type/content of data that is transmitted by the active pen (240), the modulation scheme used to transmit the data, the function of the buttons (not shown) on the active pen, etc., are controlled, at least in part, by the software (225). In one or more embodiments of the invention, the controller (224) is configured to modify the software (225) based on the reprogramming instructions. Modifying the software (225) may include replacing a portion or all of the software (225) with replacement code. The replacement code may be transmitted as part of the reprogramming instructions. Additionally or alternatively, the replacement code may already be stored within the active pen (240) and the reprogramming instructions identify the replacement code but do not include the replacement code. Modifying the software (225) may include changing one or more operating parameters of the active pen (240) (e.g., frequency at which the active pen transmits signals, output power of the transmitted signals, etc.).
In one or more embodiments, the active pen (240) includes a battery (228). The battery (228) provides electrical power to other components of the active pen (240). In one or more embodiments of the invention, the battery (228) may be recharged using low frequency currents received by the receiver (222) (discussed below).
In one or more embodiments, the active pen (240) operates in two modes: normal mode and reprogramming mode. The default mode may be normal mode. During normal mode, the software (225) is being executed and the active pen (240) is operating as dictated by the software (225). In reprogramming mode, the active pen (240) is obtaining reprogramming instructions and replacing some or all of software (225). There may be one or more events that trigger a switch between the operating modes of the active pen (240) (e.g., from normal mode to reprogramming mode).
For example, user interaction with buttons on the pen (e.g., a specific button sequence) and/or other sensors on the pen (e.g., force gauge) may trigger the switch to reprogramming mode. As another example, if the receiver (222) includes a socket, insertion of an audio jack into the socket may trigger the switch to reprogramming mode. As another example, if the receiver (222) includes a photo-receiver, removing (e.g., sliding or retracting) a cover/gate that normally shields the photo-receiver from stray light may trigger the switch to reprogramming mode. Additionally or alternatively, detecting high-light levels emitted by the display screen (155) may be used to trigger the switch to reprogramming mode. As yet another example, the state of the buttons when the active pen is turned on and/or when the battery (228) is installed may be used to trigger the switch.
In
In
Initially, reprogramming instructions are obtained (Step 505). The reprogramming instructions may be obtained by a reprogramming device (e.g., input device (100), discussed above in reference to
In Step 510, the reprogramming instructions are transmitted from the reprogramming device to the active pen. Specifically, the reprogramming device may have one or more output devices (e.g., socket for an audio jack, display device, speaker, etc.) for transmitting the reprogramming instructions to the active pen. Accordingly, the reprogramming instructions may be transmitted over an audio cable, using light emitted from a display device, using acoustic waves generated by a speaker, etc. The active pen has the necessary sensor(s) (e.g., force gauge, microphone, photo-detectors, socket for audio jack) and circuitry to interface/detect the reprogramming instructions being transmitted by the reprogramming device and decode the reprogramming instructions.
In Step 515, the active pen modifies the software (e.g., firmware) based on the reprogramming instructions. As discuss above, this may include replacing all or part of the software with replacement code that is either included with the reprogramming instructions and/or stored separately and identified by the reprogramming instructions. Additionally or alternatively, modifying the software may include changing one or more operating parameters of the active pen.
Various embodiments of the invention may include one or more of the following advantages: the ability to reprogram an active pen without bringing a pin of the active pen's controller to the exterior of the active pen; the ability to reprogram an active pen with an easily replaceable audio cable; the ability to reprogram the active pen using the light of a display screen; the ability to reprogram the active pen using light having different intensities, different colors, and/or different pulse durations; the ability to reprogram an active pen having a microphone or force gauge using acoustic waves; etc.
While the invention has been described with respect to a limited number of embodiments, those skilled in the art, having benefit of this disclosure, will appreciate that other embodiments can be devised which do not depart from the scope of the invention as disclosed herein. Accordingly, the scope of the invention should be limited only by the attached claims.
