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Antenna unit and electrical connection device thereof and portable device having the sameAntenna unit and electrical connection device thereof and portable device having the same description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20080042910, Antenna unit and electrical connection device thereof and portable device having the same. Brief Patent Description - Full Patent Description - Patent Application Claims
CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This is a divisional application of application Ser. No. 11/172,870, filed Jul. 5, 2005, which claims the benefit under 35 U.S.C. .sctn.119(a) of Korean Patent Application No. 10-2004-0051713 entitled "Antenna Unit, Electrical Connection Device Thereof, And Portable Device Having The Same" filed in the Korean Intellectual Property Office on Jul. 2, 2004, and Korean Patent Application No. 10-2004-0092413 entitled "Antenna Unit, Electrical Connection Device Thereof, And Portable Device Having The Same" filed in the Korean Intellectual Property Office on Nov. 12, 2004, the entire disclosures of each are hereby incorporated by reference. BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The present invention relates generally to portable devices including digital communication devices such as cellular phones, personal digital assistants (PDAs), hand-held phones (HHPs), camera phones, game phones, and Internet phones, and in particular, to an antenna unit thereof. More specifically, the present invention relates to an antenna unit and an electrical connection device thereof, of which the opening/closing is simple and wherein an antenna reception sensitivity level is adjustable and further relates to a portable device having the same. [0004] 2. Description of the Related Art [0005] Typically, a "portable communication device" refers to an electronic device which a user can carry while performing wireless communications with another party. The configuration trends of such portable communication devices is toward miniaturizing, sliming, and decreasing the weight, as well as improving gripping while considering the desired portability of the device. Further configuration trends are toward providing multimedia with which more various functions can be pursued. Accordingly, portable communication devices are evolving into small, light-weight multi-function communication devices, and are being continuously improved to adapt to various multimedia or Internet environments. Also, such portable communication devices are being recognized as necessities to always be carried, without regard to the age or sex of the user in all parts the world. [0006] Popularized conventional portable communication devices are classified into several types by appearance. For example, according to the appearances, conventional portable communication devices are classified into bar type, flip type, and folder type communication devices. The bar type communication device designates a communication device in which a single housing is formed in a bar type, the flip type communication device designates a communication device in which a flip member is rotatably assembled with a bar type housing by a hinge apparatus, and the folder type communication device designates a communication device in which a folder member is rotatably assembled with a single bar type housing by a hinge apparatus so that the folder member can be folded over the housing. [0007] Also, the portable communication devices may be classified according to wearing positions or methods into neck-wearable type and wrist type communication devices. The neck-wearable type communication device designates a portable communication device that can be carried by wearing the portable communication device around the user's neck using a string, and the wrist type communication device designates a portable communication device that can be carried by wearing the portable communication device around the user's wrist. [0008] Also, regarding opening/closing methods of the devices, the portable communication devices may be further classified into rotation type and sliding type communication devices. The rotation type communication device designates a communication device in which two housings are rotatably assembled and are opened/closed while facing each other, and the sliding type communication device designates a communication device in which two housings are opened/closed by a sliding movement in a longitudinal direction. The variously classified portable communication devices described above are well known to those skilled in the art. [0009] These conventional portable communication devices are further developing into advanced portable communication devices capable of enabling high-speed data communication in addition to a voice communication function. That is, in order to meet the customers' increasing demands, future portable communication devices will provide services using wireless communication technologies for transmitting data at a high data rate. [0010] Recently, conventional portable communication devices have been provided with camera lenses, thereby popularizing the transmission of image signals. The popularized portable communication devices can now further perform visual communications or photographing functions using an external or built-in camera. [0011] However, antenna devices used in the conventional portable communication devices have the following problems. In a case where the conventional portable communication device has a retractable antenna comprised of a helical antenna and a rod antenna as an antenna device, the user is inconveniently required to pull out the retracted rod antenna when reception sensitivity decreases, and retract the pulled-out rod antenna after a call. Further, when the portable communication device is carried in a pocket, the portability of the device is decreased due to the protrusion of the antenna device. Also, when the portable communication device is dropped, the external antenna is frequently damaged. [0012] Also, in a case where the portable communication device has a fixed built-in type antenna device, when the antenna's reception sensitivity decreases due to geographical features, there is no way to cope with the decrease in reception sensitivity. [0013] Accordingly, a need exists for a system and method for an improved antenna unit for portable communication devices. SUMMARY OF THE INVENTION [0014] An object of the present invention is to substantially solve at least the above problems and disadvantages, and to provide at least the advantages described in greater detail below. Accordingly, an object of the present invention is to provide a portable device including a variable built-in antenna of which the reception sensitivity can be adjusted by sliding the antenna up or down according to the reception sensitivity. [0015] Another object of the present invention is to provide a portable device including a variable built-in antenna which is formed to slide according to reception sensitivity. [0016] Another object of the present invention is to provide a portable device including a variable built-in antenna which is formed to linearly slide in a longitudinal direction of a main body. [0017] Another object of the present invention is to provide a portable device including a variable built-in antenna which is simply opened/closed. [0018] Another object of the present invention is to provide a portable device including a sliding variable built-in antenna which is formed to automatically, manually, or semi-automatically transfer power for sliding movement according to reception sensitivity. [0019] According to one aspect of the present invention, a portable device is provided and comprises a main body, a variable built-in antenna which is assembled at a predetermined location of the main body and configured to slide up/down in a longitudinal direction of the main body according to antenna reception sensitivity, and an electrical connection device for signal transmission between the main body and the variable built-in antenna. [0020] According to another aspect of the present invention, an electrical connection device of a portable device for signal transmission between a main body and a variable built-in antenna, which is configured to slide up/down with respect to the main body, is provided and comprises a fixed printed circuit board (PCB) mounted on the main body, a mobile antenna PCB mounted on the variable built-in antenna, and a connection device which transmits signals by slidably connecting a free end to the fixed PCB and an end to the mobile antenna PCB, wherein the free end slidingly contacts the fixed PCB according to the sliding movement of the mobile antenna PCB. [0021] According to another aspect of the present invention, an electrical connection device of a portable device is provided and comprises a fixed printed circuit board (PCB), a mobile PCB, and a helical wire cable, both ends of which are fixed and electrically connected to the fixed PCB and the moving PCB, respectively. The helical wire cable is assembled along a moving direction of the mobile PCB so that a length thereof is variable. Continue reading about Antenna unit and electrical connection device thereof and portable device having the same... Full patent description for Antenna unit and electrical connection device thereof and portable device having the same Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Antenna unit and electrical connection device thereof and portable device having the same patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. 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