Antenna connector

Abstract: The object of the invention is a radio set comprising a chuck for attaching an antenna unit to the device. The chuck (1) comprises a means (5) for a quick attachment of the antenna unit (2, 3) to the chuck. Furthermore, the device comprises a means (7) for establishing an electric contact from the antenna unit attached to the chuck to the transceiver means through the chuck. The connection according to the invention is quick with respect to the assembly. Furthermore, the connection does not wear adversely when the antenna is rotated.

Description: Background The invention is related to radio equipment technology and is particularly concerned with connecting an antenna to a telecommunication radio set with the aid of a chuck. The invention is particularly well-adapted to be used in relatively small telecommunication devices which require an antenna that is both rotatable and turnable. The invention can be applied in mobile phones, for example. Generally, mobile phones employ antennas that can be pushed inside the device to save space. Such an antenna is not the best possible solution for all devices, which is why antennas are required which are outside the device in full. It is well-known to attach an external antenna to a device by using a chuck to which the antenna is attached by threads. One problem of the solution is that it slows down the assembly of the device. Another solution is known in which the antenna can be attached to the chuck by pushing it into the chuck and detached by pulling it out of it (Ericsson mobile phone GH 337). In this solution, an electric contact is established directly from the end of the shaft journal to the circuit card. In principle, the antenna is rotatable but if this is done repeatedly in daily usage, the tip of the shaft journal will wear down fairly quickly. Consequently, the antenna element is provided with a special plastic snap ring which is intended to prevent unnecessary rotation of the antenna. EP-A-601702 describes (Fig. 4) a connector member with a metal shell and inside the shell two longitudinal dielectrically insulated metal springs. The other connector member is matable with the first connector member and comprises a metall shell and inside it an dielectric body with an radial extension supporting the contact end of antenna. The extension with the contact end is clamped by the springs of the first connector member, when the members are connected. GB-A-2195841 describes a quick-locked non-rotatable antenna in which the contact is established by a pin separately from the sleeve, into which the antenna is fastened. US-5278570 describes an antenna which is fastened to a housing by screwing. After the antenna has been fastened, it is not rotatable for optimizing its position. Contact is taken with wires from the housing. US-5 336 896 discloses a quick-release connection between a mobile phone and a tiltable and turnable antenna. US-4 350 408 discloses two types of quick-locking connectors allowing relative rotation. Description of the invention A telecommunication radio set according to Claim 1 provided with an antenna connection has now been invented. The preferred embodiments of the invention are presented in the other Claims. According to the invention, the antenna unit can be attached to the device by a quick-fastening and the electric connection from the antenna to the transceiver means is provided through the chuck. Because of the quick-fastening, the antenna is fast to install in production. Furthermore, the antenna is easy to attach in use when desired. When the contact is established through the chuck, there will be less wear. The chuck is constructed so that the antenna unit can be detached from it quickly. The chuck is constructed so that the antenna can be rotated on it. In this way, it is easy to turn the antenna in an optimal position without having to move the device itself. Such an antenna is especially advantageous in a multi-purpose data transmission device which can be used to transmit both audio information and alphanumeric or visual information. Furthermore, the antenna is preferably articulated so that it is possible to choose different operational angles to achieve optimal transmission and reception performance in different operating environments. The chuck and the end of the antenna unit attached thereto constitute a combination of a sleeve and a pin. The chuck may constitute the sleeve and the end of the antenna unit can constitute the pin placed in it. The chuck is constructed so that the antenna unit can be attached to it by pushing and detached from it by pulling. The chuck comprises a flexible fastening member so that the end of the antenna unit can be attached to the chuck against the spring force. The flexible fastening member itself may be flexible, or the end of the antenna unit may be provided with a flexible fitting member that corresponds to the flexible fastening member. The flexible fastening member may be provided with a separate spring. The chuck may be attached to the case of the device or, for example, directly to the circuit board. To provide the electric connection from the chuck to the circuit of the device, a suitable contact member such as a spring can be provided. The contact point between the chuck and the circuit can be stationary, even if the antenna is rotated in the chuck. In this way, wear-and-tear can be eliminated. The antenna unit may be provided with a special attachment which is used to attach the unit to the chuck. Preferably, the antenna is rotatable in the transverse direction of the axis in the attachment and the unit is provided with locking members to lock the swing angle of the antenna. Another object of the invention is an antenna unit suitable for the device according to Claim 1. In the following, some advantageous applications of the invention are described in detail. The appended drawings are part of the description of the invention. In the drawings Fig. 1 is an exploded view of a chuck and an antenna unit according to the invention, Fig. 2 presents an alternative embodiment of the structure of Fig. 1, Fig. 3 presents the structure of Fig. 1 in the assembled form, Fig. 4 presents the structure of Fig. 1 in a mobile phone, and Fig. 5 presents the functional diagram of the radio set. The main parts of the antenna connection according to Fig. 1 comprise chuck 1, fastening sleeve 2 of the antenna, and antenna 3. Chuck 1 is a sleeve-like body with a support flange 4 provided at the upper end and a tensioning recess 5 flexible in the radial direction and narrower than the support flange provided at the lower end thereof. The flexibility of the recess is provided by axial cuts on the lower end of the flange. An annular spring groove is provided on the outer surface of the recess and annular leaf spring 6 is placed in the groove. The leaf spring tends to prevent the expansion of the tensioning skirt in the radial direction. The electric contact is established from the chuck, the side thereof, to the circuit of the device by spring clip 7 which presses against the leaf spring. The chuck is attached to the outer case of the device at its support flange so that the upper end of the flange is placed outside the case. Rotary pin 8 that is fitted in chuck 1 is provided at the lower end of fastening sleeve 2 of the antenna, the lower end of the rotary pin being provided with a locking flange. When the pin is pushed into the chuck, the strips of its recess 5 bend elastically outwards until the locking flange of the pin has passed through the skirt of the recess, whereby the pin is locked in place. However, the pin can be rotated in the chuck. To ensure even rotation, O ring 9 is placed between the chuck and the sleeve to provide convenient and even rotational friction. The locking flange of the pin and the lower end of the recess are suitably chamfered so that the pin can be pulled out of the chuck against the force of the strips of the recess and that of spring 6. Swivel base 10 of the antenna is provided at the upper end of fastening sleeve 2. It is provided, at the upper end thereof, with groove 11 in the axial direction and with a bore lateral to the groove. Correspondingly, the lower end of antenna 3 is provided with base block 12 of the same width as the groove and provided with a bore. The base block of the antenna is placed in the groove and attached in place by using fastening pin 13 that is pushed through the bores. The groove of swivel base 10 and base block 12 of the antenna are so designed that the antenna can be turned in the groove. In this way, the antenna can be placed in the best possible angle with respect to reception or transmission. However, the antenna is easy to place in and to detach from the device . Fastening sleeve 2 and base block 12 of the antenna are further provided with a rotatable locking system which can be used to lock the antenna at a given switch angle. For this purpose, transversal slits 14 are provided on the surface of the base block and slide 15 and spring 16 are provided in the fastening sleeve, the spring pressing the slide against the base block. The slits and the slide are so designed that the antenna can be turned against the spring force, whereby the slide moves from one slit to another. In the application according to the figures, two slits are provided so that the antenna can be locked accurately either at a 0° or a 90° angle. Naturally, other locking angles and a larger number of them may be used when desired. Because the sleeve can be turned in the chuck,it is sufficient that locking slits are provided only on one side of the fastening block. Spring 16 not only locks antenna 3 but also ensures the contact between sleeve 2, pin 13, and the antenna. Spring 16 is a helical spring in this embodiment. Slide 15 is a pin which is pressed by the spring, at the lower end thereof, against the fastening block. Fastening sleeve 2 is provided with a recess extending from upwards to rotary pin 8, the lower end of the spring pressing the bottom of the recess. Chuck 1 and fastening sleeve 2 consist of, e.g., brass, and fastening pin 13 of steel. Leaf spring 6 is of, e.g., stainless steel, and slide 15 of a suitable plastic. Antenna 3 consists of a desired metal. Depending on the use, the frequency range of the antenna can range between 450 kHz and 2 GHz, for example. Matching impedance can range between 20 and 200 Ω and it can be either inductive or capacitive. Fig. 2 presents an application corresponding to Fig. 1, comprising chuck 1 that is provided with stiff recess 5', but the surface of the rotary pin 8' of fastening sleeve 2 is flexible in the radial direction. In this case, there is no need for a separate check spring to lock the fastening sleeve to the chuck. Otherwise, the device is similar to that in Fig. 1. Spring clip 7 is directly against the chuck in this application. Fig. 3 presents the application according to Fig. 1 in an assembled form and with antenna 3 in a straight position. Fig. 4 presents antenna 3 installed in a mobile phone. Chuck 1 is attached to case 17. Spring clip 7 is soldered to circuit board 18. Fig. 5 presents the functional diagram of the mobile phone. Antenna unit 3, 2 is attached to the device with the aid of chuck 1. The antenna is in contact with duplex filter 19 which is connected to receiver 20 and transmitter 21. Regarding the assembly of the device, the solution is easy and quick. Chuck 1 can be installed in the case during manufacture. Antenna 3 can also be attached to its sleeve 2 in advance. The only thing that is required when assembling the actual device is to push the antenna unit in place. The antenna requires neither tensioning by twisting nor installing connectors to establish connection from the cable to the antenna. Furthermore, the user will be able to easily relocate the antenna unit. Consequently, it can be placed separately in the package of the device to save space. The user may also easily detach the antenna unit for transportation or replacement, for example. Furthermore, antenna connection 1, 2 withstands repeated twisting well, which is advantageous in devices in which antenna 3 must be adjusted frequently to ensure the best possible transmission and reception performance. This might be the case in dual-purpose data transmission devices in particular which can be used to transmit both audio and alphanumeric or visual information. In this case, the device can be in a stationary position on the base and an optimal position of the antenna can be obtained by only moving the antenna. Furthermore, the articulation of the antenna allows for a considerably larger variety of positions. A large contact surface is provided between fastening sleeve 2 and chuck 1, whereby wear-and-tear will not be a problem (as opposed to, for example, a device in which the thin end of an antenna pin is against the contact body). In the device described, the chuck and contact member 7 do not move with respect to one another at all when the antenna is turned in the chuck. The entire recess 5/5' does not have to be made of conductive material but one side of the periphery can comprise plastic and the other side metal so that contact member 7 is naturally in contact with the metal. One possibility is to only make the surface of the recess conductive. Furthermore, when spring 6 is connected to flexible recess 5, on which spring the stress is mainly exerted, even a plastic recess will withstand a fairly large amount of deflection without wearing out. If the spring fatigues, it can be replaced.

Claims: A telecommunication radio set comprising a circuit (18) including a transceiver means, a sleeve-like chuck (1) for attaching an antenna unit (2, 3) to the radio set, means (1, 7) for establishing an electric contact from the antenna unit attached to the chuck to the circuit, and a fastening means (5; 5') for a quick locking of the antenna unit to the chuck, to which fastening means (5; 5') the antenna unit can be attached by pushing, and from which fastening means (5; 5') the antenna unit can be detached by pulling enabling a quick detachment of the antenna unit attached to the chuck, wherein the chuck together with the end of the antenna unit attached to the chuck forms a nesting sleeve and pin combination, and wherein the fastening means (5; 5') is flexible and the antenna unit can be attached to the chuck against the force of the flexible fastening member, characterised in that electric contact is established from the antenna unit (2, 3) to the chuck (1) and with a contact member (7) from the chuck to the circuit, that the chuck comprises a means (5; 5') which allows the antenna unit attached to the chuck to be rotated around its axis for optimizing the position of the antenna (2, 3), and that the antenna unit comprises a rotary pin (8; 8') to be fitted in the chuck. A device according to Claim 1, characterised in that the electric contact is established from the side of the chuck (1) by the contact member (7). A device according to Claim 1 or 2, characterised in that the chuck constitutes the sleeve and the end of the antenna unit constitutes the pin. A device according to any of Claims 1-3, characterised in that the contact member (7) is a spring. A device according to any of Claims 2-4, characterised in that the contact point between the chuck and the circuit of the device is stationary. A device according to any of Claims 1-5, characterized in that the antenna (2, 3) is articulated. A device according to any of Claims 1-6, characterized in that the chuck (1) comprises the flexible fastening member (5, 8; 5' 8'). A device according to any of Claims 1-7, characterized in that the chuck is provided with a tensioning recess (5) flexible in the radial direction or with a stiff recess (5') and a rotary pin (8') flexible in the radial direction. A device according to any of Claims 1-8, characterized in that the lower end of the rotary pin (8; 8') is provided with a locking flange. A device according to any of Claims 1-9, characterized in that the telecommunication radio set is a multi-purpose data transmission device which can be used to transmit both audio information and alphanumeric or visual information. A device according to any of Claims 1-10, characterised in that the telecommunication radio set is a mobile phone.

Inventors: EERIKAEINEN JUKKA, EERIKAEINEN, JUKKA, Eerikäinen, Jukka
Applicants: NOKIA MOBILE PHONES LTD, NOKIA MOBILE PHONES LTD.
Application year: 1996
Main classification: H01Q1
IPC codes: H01Q1