Computer graphics processing and selective visual display system – Display peripheral interface input device – Touch panel
Reexamination Certificate
1997-10-22
2001-01-23
Chang, Kent (Department: 2778)
Computer graphics processing and selective visual display system
Display peripheral interface input device
Touch panel
C345S156000, C178S018030
Reexamination Certificate
active
06177926
ABSTRACT:
TECHNICAL FIELD
The present invention relates generally to a hand-held computer terminal employing a touch screen for the input of handwritten data, and more particularly, to a hand-held computer terminal employing means for preventing unintentional actuation of input keys or buttons during the entry of handwritten data.
BACKGROUND OF THE INVENTION
Portable computers, such as hand-held data entry terminals, personal digital assistants, and the like are commonly used in a variety of applications. For example, such computers are commonly used by individuals for personal computing purposes, by sales persons, distributors, delivery persons, auditors, and the like, where it is advantageous to employ a portable computer terminal in a route or otherwise mobile setting. Such applications include sales, distribution, control and inventory of products delivered, and delivery or tracking of products, packages, etc. Portable or hand-held data terminals have proven useful in increasing the efficiency of such applications by automating the entry and electronic storage of order, sales, delivery, receipt, pricing, inventory control, and other information.
In many of such mobile personal computing or distribution and delivery situations, it is often desirable to input handwritten data using a touch screen or digitizing tablet and stylus rather than by using another input device, e.g., buttons, keypad, optical device, etc., for example, in those instances where it is easier, more convenient, or more efficient than using another input device. Particular instances where handwritten data may be desirable are, for example, when entering graphical textual information, selecting text, objects, or icons, etc. on a screen display, recording a signature, i.e., when signature is required for a delivery and/or for verification, etc.
Computers designed for hand-held use are desirably as small and lightweight as possible. However, the space limitations required for portability can result ergonomic disadvantages, such as a cramped area for the hand to rest while a user enters handwritten data. Another problem is the possibility of inadvertent actuation of keys by a user entering handwritten data via the touch screen. Thus, there is a need in the art for a hand-held computer which retains an efficient use of space while providing a means for preventing the unintended actuation of keys during the input of handwritten data and providing an ergonomic hand rest surface for entry of handwritten data.
SUMMARY OF THE INVENTION
The present invention provides a hand-held computer having handwritten data input means and means for preventing unintended actuation of input keys. Entry of handwritten data commonly employs a stylus and an input means such as a touch screen or digitizing tablet. Entering handwritten data using a stylus and touch screen or digitizing tablet is often more difficult than writing with pen and paper, in part because of low friction between the stylus and touch screen surface and also in part because of a lack of adequate hand support. Increasing the comfort and stability of the handwritten data entry process gives the advantage of increased accuracy or legibility of handwritten data. For example, character recognition is a software feature often found on hand-held units. The performance of character recognition programs can be improved if handwritten characters can be more consistently and more legibly entered. Also, potential problems with verification or authentication of an electronic signature can be minimized by ergonomically improving the handwritten data entry process, thereby improving legibility.
It would also be desirable to provide a hand-held computer wherein the keys are protected from actuation when the person entering the handwritten data is not the primary user, for example, in a mobile setting such as sales, delivery, etc., where an handwritten data such as an electronic signature is recorded. In such cases, it is advantageous to protect the keys from inadvertent actuation by providing a barrier between the hand and keys or by temporarily deactivating the keys.
In a first embodiment according to the present invention, the means for preventing unintended actuation of input keys comprises an ergonomically improved hand rest surface disposed adjacent to the handwritten data input means to facilitate the handwritten data entry process. The hand-rest surface serves not only to provide support for the hand during the entry of handwritten data, but also acts as a barrier to protect any keys, buttons, and the like, which are disposed on the surface of the computer from unintentional or accidental actuation by the user during a signature or other handwritten data entry process.
In a second embodiment of the present, the means for preventing inadvertent actuation of keys during the handwritten data entry process comprises a sleep button which deactivates some or all of the keys or buttons on the computer.
In a third embodiment of the present invention, the means for preventing unintended actuation of keys comprises a sensor beneath the handrest portion of the computer housing which deactivates some or all of the keys or buttons on the computer.
In a fourth embodiment of the present invention, the means for preventing unintended actuation of keys comprises means for deactivating some or all of the keys or buttons when the touch screen is in use.
Additionally, the hand-held computer according to the present invention is advantageously light in weight and is rugged enough for use in a sales route, delivery or distribution route, or otherwise mobile environment, protected against external contaminants, such as rain and dust, and protected against excessive shock due to dropping or rough handling.
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Chang Kent
Intermec IP Corp.
Suiter & Associates PC
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