DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

[0016] Referring to FIG. 1 , as shown in the blocks, the hand writing input device for cellular phone according to the present invention comprises: a digital pen 1 containing an electromagnetic signal transmitting circuit for emitting electromagnetic signals when writing or drawing on a digital tablet 2 with the digital pen 1 ; the digital tablet 2 further including a signal selector 22 , a signal amplifier 23 , an analog/digital converter 24 , a micro controller 25 , and a transmission interface 26 , wherein a wire grid 21 formed of two perpendicular sets of parallel conducting wires is provided on the digital tablet 2 . When writing or drawing on the digital tablet 2 with the digital pen 1 , the electromagnetic signal emitting from the digital pen 1 is received by the wire grid 21 , such that current signals are induced in wire grid whereat the digital pen 1 and digital tablet 2 are contacted. The selected current signal from the signal selector 22 is amplified by the signal amplifier 23 and then the amplified current signal is converted to a digital signal by the analog/digital converter 24 , and is treated in the micro controller 25 to form data of the coordinate for the position and relative information. The single datum of coordinate or track data from collected information can be transmitted by wire or wireless to the cellular phone 3 through the transmission interfaces 26 , 34 respectively in the digital tablet 2 and the cellular phone 3 . The transmission can be either in wired or in wireless transmission form. The wired form may be in RS-232, USB, regular cellular phone interface specification, or IEEE 1394, while the wireless form may be in IR, RF or bluetooth. Cellular phone 3 at least comprises a transmission interface 34 , a driver 33 or a application program module 32 , and a transmission/storage module 31 . These data are then treated by the application program module 32 or the driver 33 and are converted into graphic data, hand written form, or computer recognized characters through a handwriting recognition software thereby forming an e-mail, or a brief message, or a document. These data can be sent to any desired destination or stored in the cellular phone 3 by the transmission/storage module 31 .

[0017] Referring to FIG. 2 , in this first embodiment of the present invention the digital tablet 2 is combined with the cellular phone 3 , without affecting existing original components of the cellular phone 3 . The information is entered into the cellular phone 3 without keying from the pad 36 on the cellular phone 3 , instead, handwriting or graphic data 5 are directly input on the surface 27 of the digital tablet 2 with the digital pen 1 , and the aforesaid handwriting or graphic data 5 will reappear as hand written form on the screen 35 of the cellular phone 3 or reappear as computer recognized characters via a handwriting recognition software depending on the actual requirements. Meanwhile, it is optional when transmitting from the digital tablet 2 to cellular phone 3 . The users may either choose synchronous transmission with input action or asynchronously transmission after completion of a series of input action, which depends on the hardware specification of cellular phone. Besides, the information may be transmitted to another cellular phone 7 , or email box via a transmitter station 6 or via the internet. If it is desirable, the information may be stored locally in the user's own phone 3 .

[0018] Referring to FIG. 3 , in the second embodiment of the present invention, in addition to emitting electromagnetic signal, the digital pen 1 may be made containing ink or ink cartridge or a digital inking pen capable of writing on a sheet of paper 4 laid on the surface 27 of the digital tablet 2 so that the data may be preserved on the paper 4 as a hard copy of the input data and can be used for future reference. As for transmitting data, it is similar to the first embodiment described above accompanying with FIG. 2 .

[0019] Obviously, the present invention has the following noteworthy advantages:

[0020] 1. The present invention can be combined with cellular phone to allow the data to be input from the digital tablet directly and transmitted to the cellular phone to improve the input device limited by the design of conventional cellular phone.

[0021] 2. The handwriting or graphic data are able to be displayed or reappear as hand written form on the screen of the cellular phone for users to store or transmit.

[0022] 3. Processed by a handwriting recognition software, the entered handwriting or graphic data can be converted to computer recognized character and shown on screen of cellular phone for further transmission or storage in the cellular phone.

[0023] 4. A digital pen containing ink cartridge or ink or a digital inking pen may be used to write directly on a paper laid on the digital tablet for the users to keep a hard copy of the input data.

[0024] Many changes and modifications in the above described embodiment of the invention can, of course, be carried out without departing from the scope thereof. Accordingly, to promote the progress in science and the useful arts, the invention is disclosed and is intended to be limited only by the scope of the appended claims.