Patent Application
20050024240
The present invention relates generally to mobile electronic devices. More particularly, the present invention relates to an improved keypad for a mobile electronic device.
In recent years, mobile electronic devices have been becoming a very popular communication tool. Providing users the capability to both transmit and receive messages while they are out of the office, for example, has been very advantageous. Moreover, such devices are also often used as an organizer, a notebook and even an address book. The input of data into the device generally occurs via different methods. One may be via a writing implement and touch sensitive screen while another method is to connect the mobile electronic device with a computer either through a wireless or serial connection. Yet another method of entering data into the device is via a keypad either attached to or assembled within the device. The keypad is used in a similar manner to a keyboard where a user depresses actuators (seen as keys on a keypad or keyboard), in order to enter the required data into the memory of the mobile electronic device.
In order to interact with the mobile electronic device using the keypad, the user generally types in text using the keypad. The keypads are usually located below the screen of the mobile electronic device so that the user may view what they are typing and make the necessary changes if the wrong key, or actuator, is depressed. This generally occurs when the user is typing quickly. Presently, there are many different keypads that are available in the art.
For instance, some mobile electronic devices have keypads that comprise of separate keys for each alpha-numeric character. The keys in these keypads are generally manufactured out of rubber with hard caps with the feel of keys on a computer keyboard. Another known keypad is manufactured out of rubber. In most cases, the keypads comprise a rubber cover covering a set of actuators representing alpha-numeric characters, but this cover does not provide any support to the actuators and therefore the actuators may shift while the user is typing.
In some cases, the keys are so small that if a user is typing quickly, they may depress two keys at once or may depress the wrong key which results in a spelling error and requires the user to correct their misspelled words which may be time consuming. Small keys also tend to be uncomfortable to type on.
According to one aspect of the invention, a keypad for a mobile electronic device comprises a frame including ridges defining a set of locations for housing actuators, a set of actuators, and means for supporting said actuators on said frame at said set of locations.
In accordance with a further aspect of the invention, a mobile electronic device comprises a display screen, and a keypad comprising a frame including ridges defining a set of locations for housing actuators, a set of actuators, and means for supporting said actuators on said frame at said set of locations.
Other aspects and features of the present invention will become apparent to those ordinarily skilled in the art upon review of the following description of specific embodiments of the invention in conjunction with the accompanying figures.
Embodiments of the present invention will now be described, by way of example only, with reference to the attached Figures, wherein:
a to 2c are views of a first embodiment of the keypad of
a to 3c are views of another embodiment of the keypad of
a to 4c are views of a further embodiment of the keypad of
Generally, a keypad for a mobile electronic device comprising ridges to direct a user's fingers towards a set of actuators while typing is provided. Many times, when a user is quickly typing input text, the user's fingers miss an intended key and either a letter is omitted or the wrong letter is typed. With the ridges, a user's fingers or thumbs are gently guided toward intended target actuators so that entered text contains fewer errors. The ridges also provide an illusion of independent or suspended keys in the keypad when, in actual fact, there is an internal frame that supports all of the actuators. The terms “keys” and “actuators” are used interchangeably because keys are generally referred to when one is talking about a keypad or keyboard while the actuators are the parts which are located under the keys and contact a circuit board or compress a metal dome, for example, when a key is depressed to actuate the circuit board to transmit signals to a processor indicating which key was pressed.
Turning to
In general, the keypad 10 provides the same functionality for the mobile electronic device 1 that a keyboard provides for a computer. Due to the size of the mobile electronic device 1, a user typically either grasps the device in one hand and uses the thumb of that same hand to interact with the keypad or grasps the device using both hands and uses both thumbs to interact with the keypad 10. Alternatively, a user may hold the device with one hand while using the free hand to interact with the keypad 10.
Turning to
As can be seen most clearly in
When the user depresses one of the actuators 16, by pressing the corresponding key location 17, the ridges 18, defining the location of the selected key location 17 assist to guide the user's fingers onto the actuator 16 while also providing support to the frame 14 and the key location 17. As will be understood by one skilled in the art, each of the actuators 16 corresponds to a switch located on a printed circuit board within the mobile electronic device 1. When a user presses the key location 17, the corresponding actuator is also depressed causing the actuator 16 to contact the switch. The switch then transmits a signal to a processor to identify the keystroke of the user, which subsequently displays an indication of the keystroke, such as a text character or number, for example, on the screen.
When the user is typing quickly, their fingers may not press down directly on the desired key location and therefore the ridges 18 act as a guide for the fingers so that preferably all keystrokes are correctly received by the processor.
The frame 14 also includes a set of holes 24 which are used to mount the keypad 10 within the mobile electronic device 1.
It will be understood that there is no restriction on the number of actuators 16 within the frame 14. The number of actuators is simply selected by the keypad designer or manufacturer. For example, in one embodiment, the keypad 10 has twenty-one actuators which indicates that at least one of the actuators represents a plurality of alpha-numeric characters. Fewer key locations 17 in the keypad 10 corresponds to a larger area for each key and as such a reduced chance of mistyping.
Having larger keys also facilitates a keypad layout whereby the keys are closer together, thus saving space. As described above, since there is not necessarily a one-to-one correspondence between each key and a single alpha-numeric character, technologies known in the art, such as predictive text and other keypad modes, may also be employed.
In a second embodiment, as shown in
The actuators 44 rest atop individual switches located on a circuit board within the mobile electronic device 1. Each of the switches is in communication with the processor of the mobile electronic device to transmit signals indicating which keys have been depressed by the user so that the keystrokes may be displayed on the screen. As above, the ridges 46 both define the location for each of the actuators 44 and provide support for the actuators 44 in the frame 42. As well, the construction of the keypad of the present embodiment allows for a low profile keypad. Depressions 51 also assist in providing the low profile for the keypad 10.
The cover 50 and actuator supports 52 are constructed from a flexible material such as rubber. The cover 50 is preferably water resistant and reduces the number of particles entering the mobile electronic device 1, which may affect operation of the device. The actuator supports 52, located between the ridges 46 and the actuators 44, support the actuators 44 in the frame 42 and suspend them in the key locations.
In this embodiment, the actuators 44 and the ridges 46 are separate from each other. However, the actuator supports 52 are supported on the ridges 46 so that the actuators 44 do not shift in a horizontal direction while the keypad 40 is in use. When depressed, the rubber actuators flex in a vertical direction in order to travel the necessary distance to activate their associated switches.
In this embodiment, the keypad may be manufactured using a 2-shot mould. A first shot of plastic fills in the frame 42, actuators 44, and the ridges 46 for the keypad 40 while a second shot of rubber fills in the area to provide the actuator supports 52 and the cover 50 thereby suspending the actuators in their appropriate locations. In this embodiment, the rubber adheres to the plastic to provide the necessary support for the actuators 44 in the frame 42. Furthermore, other materials may be contemplated for the frame, the actuators and the cover with the basic requirement being that a stiff frame and actuators are created along with a flexible cover.
The present embodiment provides a keypad which has a visual effect of independent and suspended keys to the user when, in actual fact, there is an internal frame that supports the keys and actuators. This also allows for a low profile and rigid assembly. As in the other embodiment, the ridges assist in defining the location of the actuators so that when a user is typing, the ridges guide the user's fingers so that preferably no keystrokes are missed. When the frame is mounted securely to the mobile electronic device further rigidity is supplied to the frame by the mobile electronic device.
Turning to
As in the preceding embodiments, the actuators 64 rest atop individual switches located on a circuit board within the mobile electronic device 1. Each of the switches is in communication with the processor of the mobile electronic device to transmit signals indicating which keys have been depressed by the user so that the keystrokes may be displayed on the screen. The ridges 66 define the location for each of the actuators 64. As well, the construction of the keypad of the present embodiment allows for a low profile keypad.
The keypad 60 also includes buttresses 72 which are preferably manufactured out of rubber and located between the frame 62 and the actuators 64. The buttresses 72 provide support for the actuators 64 in the frame 62 in order to reduce the amount of horizontal shifting by the actuators 64 when the keypad is in use.
In this embodiment, the keypad 60 may be manufactured using a 2-shot mould, for example with a first shot of plastic to fill in the frame 62 and the actuators 64, and a second shot of rubber to fill in the areas to provide the buttresses 72. As above, the rubber adheres to the plastic to provide the necessary support for the actuators 64 in the frame 62.
Another advantage of the keypads described herein is ease of manufacturing, since less tooling is required. These keypads also provides a tactile feel due to the presence of the ridges. Furthermore, the actuators are self-supported by the frame which produces a one-piece keypad in a preferred embodiment
It will be understood that although keypads have been described above with reference to a mobile electronic device, keypads according to aspects of the present invention may be installed in other types of devices as well, including a telephone, for example.
The above-described embodiments of the present invention are intended to be examples only. Alterations, modifications and variations may be effected to the particular embodiments by those of skill in the art without departing from the scope of the invention, which is defined solely by the claims appended hereto.
| Number | Date | Country | Kind |
|---|---|---|---|
| 0316548.7 | Jul 2003 | GB | national |
