Portable terminal computer

Abstract: A portable terminal computer includes a main body (1) having operation means and input/output means of its own and which can be carried separately and is to be connected to a host computer through communication means, and an optional unit to be connected to the main body (1). The optional unit (6) is provided with a connector (15) for connecting the main body (1) by means of a wiring, a guide (8) serving as a guide in the connection to the main body (1), and a lock pawl (9) provided for a coupling to said main body (1) and having lock releasing means (17). The main body (1) includes a guide inserting slot (10) in which the guide (8) is inserted, a pawl inserting slot (11) in which the lock pawl (9) is inserted and an engagement portion (30) for engaging the lock pawl (9). The above-described structure allows smooth attachment and detachment of the main body (1) to and from the optional unit (6), thereby preventing malfunction and trouble to occur.

Description: BACKGROUND OF THE INVENTION Field of the Invention The present invention relates generally to a portable terminal computer according to the preamble of claim 1 and known from GB-A-2,202,381. Description of the Background Art For example, a modem communication device which receives and transmits data between a portable terminal computer and a host computer through a telephone line is conventionally used as an optional unit to be connected to a main body of such a portable terminal computer as required. The modem communication device is connected to the portable terminal computer by means of a flat cable having male connectors at the opposite ends thereof and if necessary, it is mounted on the portable terminal computer at a protruding bracket by screws. The above-described conventional portable terminal computer is however connected to the modemn communication device through a flat cable having the male connectors at the opposite ends thereof. Therefore, when in carrying the modemn communication device together with the main body of the portable terminal computer to a customer, for example, the modemn communication device should be fixed to the bracket of the main body by screws, which makes the attachment and the detachment by using a screw driver time consuming and troublesome. Furthermore, the flat cable with the male connectors and the bracket protruding from the main body hinder the carriage of the device and makes the device not look neat due to lack of an uniform appearance. In addition, when in carrying the modemn communication device unfixed to the main body, the connectors and the flat cable are damaged to cause an imperfect contact of the connectors, resulting in malfunction of the main body or the modemn communication device. The conventional portable terminal computer also allows attachment and detachment of the modemn communication device at any time while the main body is turned on. Thus, unless the main body is once turned off prior to the attachment and detachment of the modemn communication device, the bus of the connector cannot be protected, so that the portable terminal computer might malfunction or be damaged. The operations of the modemn communication device are therefore complicated, the attachment of the device requiring three operations of a power off, a mounting and a power on and the detachment thereof requiring at least three operations of a power off, a dismounting and a power on. Besides, careless attachment and detachment without turning off the power supply causes the portable terminal computer to malfunction or to be damaged. SUMMARY OF THE INVENTION An object of the present invention is to provide a portable terminal computer having a main body which can be directly attached and detached with ease to and from an optional unit by means of connectors of the main body of the computer and the optional unit and having an excellent connection to the optional unit to make the computer easy to carry and look neat as a result of the attached optional unit being securely fixed. Another object of the present invention is to provide a portable terminal computer directed to preventing a trouble caused in attaching and detaching an optional unit to and from a main body of the computer by detecting operations of connector means of the main body of the portable terminal computer and the optional unit. These objects are achieved by a computer according to claim 1. The portable terminal computer includes a main body having an operation portion and an input/output of its own to be carried separately and connected to a host computer through communication means, and an optional unit to be connected to the main body. The optional unit is provided with a connector for a wiring connection to the main body, a guide for guiding the connection to the main body and lock pawl provided for a coupling to the main body and having lock releasing means. The main body includes a guide inserting slot in which the guide is inserted, a pawl inserting slot in which the lock pawl is inserted and engaging means for engaging the lock pawl inserted in the pawl inserting slot. The portable terminal computer having the above-described structure operates as follows. First, in attaching the optional unit to the main body of the portable terminal computer, when the guide provided protruding from the optional unit is inserted in the guide inserting slot of the main body to bring the optional unit near the main body, the both connectors of the main body are positioned to be easily mated, so that the lock pawl of the optional unit fits in the pawl inserting slot through the pawl inserting hole. Then, the lock pawl is engaged with the engaging portion of the main body to prevent the detachment of the optional unit from the main body. In detaching the optional unit from the main body, the operation of the lock releasing means the lock pawl causes the lock pawl to disengage from the engaging means. Subsequently, when the optional unit is pulled, the guide pulled out from the guide inserting slot guides the connectors and the lock pawl of the optional unit to smoothly detach from the main body, whereby the optional unit is dismounted. In the portable terminal computer according to the present invention, the connector of the main body has its opening covered with a connector cover, and the optional unit is provided with locking means for coupling the unit to the main body. The optional unit is further provided with lock detecting means for detecting the operation of the locking means to determine whether the coupling to the main body is completed or not and outputting a signal to the main body. The main body is provided with a connector cover detecting means for determining whether the connector cover covers the opening of the connector or not to output the determination to the main body and power supply controlling means for controlling a power supply to the main body in response to the output signal to the main body. The portable terminal computer having the above-described structure operates as follows. In attaching the optional unit to the main body of the portable terminal computer, first an operator opens the connector cover of the main body, which is detected by the connector cover detecting means provided at the main body to output an output signal to the main body, whereby the power supply controlling means stops a power supply to the main body. Then, the operator completely mates and couples the optional unit to the main body, whereby the locking means of the optional unit completes the coupling operation to the main body. The lock detecting means provided at the optional unit detects the completion to output an output signal to the main body, whereby the power supply controlling means restarts the power supply to the main body. Conversely, in detaching the optional unit from the main body, the operator pulls out the optional unit from the main body while releasing the lock of locking means. As a result, the coupling of the locking means to the main body is removed, which is detected by the lock detecting means to output an output signal to the main body through the connector, and in response thereto, the power supply controlling means stops the power supply to the main body. The connector cover detecting means detects the optional unit being completely dismounted and the connector cover of the main body being closed to output an output signal and in response thereto, the power supply control means restarts the power supply to the main body. The above-described portable terminal computer allows attachment and detachment of the optional unit to the main body to be easily and quickly performed without a screwing or the like. Requiring no flat cable nor a bracket for connection, the computer is easy to carry and presents an uniform appearance to look neat. The portable terminal computer with the optional unit attached thereto can be therefore carried while holding the attachment fixedly without causing malfunction due to a damage or an imperfect contact of the connector. The power supply controlling means automatically controls a power supply to the main body in response to the output signals from the connector cover detecting means and the lock detecting means, which eliminates an anxiety of the operator about malfunction, a damage or a restarting of power supply of the portable terminal computer, achieving easy attachment and detachment of the optional unit to and from the main body with a simple operation. The foregoing and other objects, features, aspects and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is an exploded perspective view showing a portable terminal computer according to one embodiment of the present invention. Fig. 2 is an exploded perspective view showing modemn communication device 6 of Fig. 1 seen from its back. Fig. 3 is an exploded perspective view of lower cabinet 6b of Fig. 2. Fig. 4 is an exploded perspective view showing only the main body 1 of the portable terminal computer shown in Fig. 1. Fig. 5 is a schematic block diagram of main body 1 and modemn communication device 6 of the portable terminal computer of Fig. 1. Fig. 6 is a partial detail view showing the connection between main body 1 of the portable terminal computer and modemn communication device 6 of Fig. 1. DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to the drawings in the following. Fig. 1 shows the main body of the portable terminal computer and the optional unit according to the present invention connected to each other. With reference to Fig. 1, a main body 1 of the portable terminal computer comprises a liquid crystal display 2, a ten key 3 as an input, a flat keyboard 4 including alphabet, Japanese character, function keys arranged thereon, a power supply switch 5 and a built-in CPU 31 (see Fig. 5). A modemn communication device 6 as an optional unit is connected to transmit and receive data signals between main body 1 and a telephone line (not shown) as required. An optical communication device 7 for transmitting and receiving optical signals to and from main body 1 is disposed between main body 1 and a host computer (not shown). Optical communication device 7 and the host computer are connected by means of a cable. Guides 8, 8 for guiding the portable terminal computer to connect with main body 1 by means of connectors are disposed at the opposite ends of modemn communication device 6 to protrude from the side surface thereof. A lock pawl 9 for coupling to main body 1 is disposed at the center of the side surface to protrude therefrom. The side surface of the main body is provided with guide inserting slots 10, 10 in which guides 8, 8 are inserted, a pawl inserting slot 11 in which lock pawl 9 is inserted and a connector cover 12 sliding to open and close a connector opening 28 (see Fig. 4). Provided at connector cover 12 is a through hole 13 in which the pawl is inserted through connector cover 12 such that the hole agrees with the position of pawl inserting slot 11 at the position where connector cover 12 fully opens connector opening portion 28, that is, when the end portion of connector cover 12 is portioned at one end (E 0 shown in Fig. 1). Modem communication device 6 contains a circuit board 14 having a connector 15 and an interface connector 16 for connecting telephone lines provided thereon between an upper cabinet 6a and a lower cabinet 6b, as shown in Fig. 2. Guides 8, 8 are fixed at an upper cabinet 6a with the tips thereof protruding from slits 8a, 8a. A slider 17 as a lock releasing means is attached on lower cabinet 6b to be slidable in the direction of the arrow B and lock pawl 9 is also rotatably attached on the same, the tip of which pawl is biased in the direction of the arrow A. A connector opening 18 of lower cabinet 6b is provided with a projection 18a for protecting a number of pins protruding from connector 15 and mating connector opening 28 of main body 1. Interface connector 16 is provided opposite to connection opening 19 for a connection with a telephone line. Fig. 3 shows the detailed structure of lock pawl 9 seen from the front side of lower cabinet 6b of Fig. 2. Lock pawl 9 pivots on a pivot 22 of lower cabinet 6b with a tip hook 9a externally protruding from an opening 20 of lower cabinet 6b and with the center of rotation 9b pivoting on pivot 22 of lower cabinet 6b by a screw 21. A projection 17a of slider 17 inserted from below through a long hole 23 provided at lower cabinet 6b is rotatably inserted in a long hole 9c to mate a pin 24 provided at lower cabinet 6b with an arc-shaped hole 9b for guiding an external rotation. A torsion spring 26 is attached in a compression manner between a spring bearing 9e of lock pawl 9 and a spring bearing 25 of lower cabinet 6b, pivoting on pivot 22 to bias the tip hook 9a in the direction of the arrow A. On the other hand, slider 17 is moved in the direction of the arrow B to rotate hook 9a by means of projection 17a in the opposite direction to the arrow A for releasing the lock. Fig. 4 shows only the main part of main body 1 of the portable terminal computer shown in Fig. 1. Main body 1 contains a circuit board (not shown) having various circuit elements (see Fig. 5) provided between an upper cabinet 1a and a lower cabinet 1b and main body 1 has a structure for the connection to modem communication device 6 provided at the side portions of upper and lower cabinets 1a and 1b. That is, each of guide inserting slots 10, 10 at the opposite ends of the side portion is partitioned off by a partition plate 27 from the circuit board, in which partition an elastic holding member 29, 29 is fit to hold guide 8, 8 of modem communication device 6 (see Fig. 2) therein. Connector cover 12 is slidably fit in a male connector 39 of main body 1 (see Fig. 5) such that connector cover 12 opens and closes connector opening 28 to be exposed. Disposed inside pawl inserting slot 11 provided at cabinets 1a and 1b to agree with through hole 13 through which the pawl is inserted into connector cover 12 in contact with the one end E 0 is a lock pin 30 as an engaging means for engaging the tip hook 9a (see Fig. 3) of lock pawl 9 of modem communication device 6, which hook being inserted through pawl inserting slot 11. Lock pawl 9 is biased in the direction of the arrow A when engaged with lock pin 30 by torsion spring 25, and the engagement is not undone unless slider 17 (see Fig. 3) is moved in the direction of the arrow B, and therefore, the attachment of modem communication device 6 to main body 1 of the portable terminal computer is securely held. Fig. 5 is the schematic block diagram of main body 1 of the portable terminal computer and the circuit board of modem communication device 6. Main body 1 comprises a power supply controller 32, an input controller 33 for controlling ten key 3 and flat keyboard 4, a display controller 34 for controlling liquid display 2, a CPU 31, an extended bus controller 38 having connector 39 for controlling input and output to and from modem communication device 6 and a connector cover detecting sensor 40 for detecting connector cover 12 (see Fig. 1) being opened or closed. CPU 31 controls each block and performs operations using a memory region of an RAM 36 based on an operation program recorded in an ROM 35 to input and output data to and from an external storing device 37 such as an IC card. Modem communication device 6 comprises a bus controller 41 having connector 15 for controlling input and output to and from main body 1 and a lock detecting sensor 42 for detecting lock pawl 9 (see Fig. 3) being locked or not. Description will be made of the operation of the connection portion between main body 1 and modem communication device 6 having the above-described structure. In attaching modem communication device 6 to main body 1 of the portable terminal computer, upon the shift of connector cover 12 of main body 1 to one end E 0 in the direction of the arrow C shown in Fig. 1, connector opening 28 and connector 39 appear and through hole 13 of connector cover 12 agrees with pawl inserting slots 11 of cabinets 1a and 1b. Then, upon the insertion of guide 8, 8 of modem communication device 6 into guide inserting slot 10, 10 of main body 1 to set modem communication device 6, both connectors 15 and 39 are mated smoothly by guides 8, 8 while they are positioned with each other, so that lock pawl 9 of modem communication device 6 fits in pawl inserting slot 11 through through hole 13. As a result, the tip hook 9a of lock pawl 9 (see Fig. 3) biased in the direction of the arrow A engages with lock pin 30 in cabinet 1b of main body 1. The secure engagement of lock pawl 9 with lock pin 30 therefore prevents modem communication device 6 from pulling out of main body 1, thereby securely holding the attachment even when an external force is applied to pull out modem communication device 6. Slider 17 is moved in the direction of the arrow B (see Figs. 2 and 3) when pulling modem communication device 6 out of main body 1. Then, lock pawl 9 rotates in the opposite direction to the arrow A to disengage lock pin 30. In this state, outwardly pulling modem communication device 6 causes guide 8, 8 pulled out of guide inserting slot 10, 10 to guide connector 15 and lock pawl 9 to be smoothly detached from main body 1, thereby dismounting modem communication device 6. As the foregoing, according to the present embodiment, connectors 15 and 39 of main body 1 and modem communication device 6, respectively, are precisely positioned by the guide of guide 8 to make a direct connection without using a flat cable. As a result, attachment and detachment of main body 1 to and from modem communication device 6 can be easily and quickly performed requiring no screwing or the like. In addition, it is easy to carry the main body with modem communication device 6 attached thereto and which appearance is neat. Even if main body 1 is carried from one place to another with modem communication device 6 attached thereto, device 6 is not pulled out of main body 1 and no malfunction occurs due to a damage or an imperfect contact of the connector because the attachment to main body 1 is securely maintained by means of lock pawl 9. According to the above-described embodiment, malfunction of main body 1 due to dusts entering the circuit board from the outside can be prevented by the partition of guide inserting slot 10, 10 of main body 1 from the circuit board by partition plate 27, 27 and by providing connector cover 12 covering connector opening 28 when modem communication device 6 is not attached. As shown in Fig. 6, connector cover detecting sensor 40 of main body 1 detects the operation of connector cover 12 to protect connector 39 and outputs an off instruction signal Sf when connector cover 12 is fully opened and outputs an on instruction signal Sn when the cover is closed, to CPU 31. Lock detecting sensor 42 of modem communication device 6 detects the operation of lock pawl 19 to output to CPU 31 of main body 1, an off instruction signal Sf and an on instruction signal Sn through connectors 15 and 39 connected to each other when the coupling to main body 1 is incomplete and when it is completed, respectively. CPU 31 receives one of the above-described off instruction signals Sf to cause power supply controller 32 to stop a power supply and also receives one of the above-described on instruction signals Sn to cause power supply controller 32 to restart the power supply. The optional unit attaching and detaching operations of the portable terminal computer having the above-described arrangement are as follows. In attaching modem communication device 6 as an optional unit to main body of the portable terminal computer, an operator fully opens connector cover 17. Then, there appears connector 16 and connector cover detecting sensor 13 detects the connector cover 17 being fully open to output an off instruction signal Sf to CPU 31 which causes power supply controller 32 to stop supplying a power. Then, the operator couples modem communication device 6 to main body 1 by mating the same, whereby connectors 15 and 39 are connected to each other and lock pawl 9 of modem communication device 6 completes its operation of coupling to main body 1. Lock detecting sensor 42 detects the completion of the coupling to output an on instruction signal Sn to CPU 31 of main body 1 through connectors 15 and 39 connected to each other, and CPU 31 receiving the signal causes power supply controller 32 to restart a power supply. Therefore, CPU 31 automatically turns on and off the power due to the attachment of modemn communication device 6 to main body 1 by means of the open connector cover 12 by the operator, which prevents malfunction and trouble, so that modem communication device 6 can be attached very easily. Conversely, in detaching modem communication device 6 from main body 1, the operator pulls out modem communication device 6 from main body 1 while releasing the lock of lock pawl 9. Then, the coupling of lock pawl 9 to main body 1 is first disengaged. Upon detecting the disengagement, lock detecting sensor 42 outputs an off instruction signal Sf to CPU 31 of main body 1 through still connected connectors 15 and 39, and CPU 31 receiving the signal causes power supply controller 32 to stop supplying a power. Then, modem communication device 6 is completely dismounted and connector cover 12 of main body 1 is completely closed, which is detected by connector cover detecting sensor 40 to output an on instruction signal Sn to CPU 31 and CPU 31 receiving the signal causes power supply controller 32 to restart a power supply. Therefore, CPU 31 is automatically turned on and off by the operator who simply dismounts modem communication device 6 while releasing the lock of lock pawl 9. As a result, also in this case, malfunction and trouble are unlikely to occur and the operation can be immediately started, so that modem communication device 6 can be easily detached through one operation. The optional unit to be attached and detached to and from main body 1 is not limited to modem communication device 6 according to the embodiment.

Claims: A portable terminal computer, comprising: a main body (1) having operation means and input/output means of its own and which can be carried separately and is to be connected to a host computer through communication means, an optionally attachable communication unit (6) to be connected to the main body (1), characterized in that said communication unit (6) includes: a connector (15) for connecting said main body (1) through a wiring, a guide (8) provided on opposing ends of said communication unit (6) protruding from its side surfaces, serving as a guide in connecting the communication unit (6) to said main body (1), a lock pawl (9) provided at a central portion of a side surface of said communication unit (6) for coupling to said main body (1) and having lock releasing means (17), said main body (1) including: a guide inserting slot (10) provided at a side surface of said main body (1) in which said guide (8) is inserted, a pawl inserting slot (11) in which said lock pawl (9) is inserted, and an engagement portion (30) for engaging said lock pawl (9) inserted in said pawl inserting slot (11). The portable terminal computer according to claim 1, wherein said main body (1) comprises a connector cover (12) slidably provided between a position at which a connector opening (28) is covered and a position at which the same is opened, the connector cover (12) having a pawl through hole (13) provided piercing through said connector cover (12) so as to allow said lock pawl (9) to be inserted when said connector cover (12) is at the position where the cover (12) opens said connector opening (28). The portable terminal computer according to claim 1, wherein said guide inserting slot (10) is provided with a partition surrounded by a partition plate (27), in which partition an elastic holding member (29) is fit, the holding member (29) guiding said guide (8) by holding said guide (8) therein. The portable terminal computer according to claim 1, the tip of said lock pawl (9) has a hook (9a) and said engagement portion (30) comprises a pin (30) engaging said hook (9a) when in locking and fixed to the main body (1). The portable terminal computer according to claim 1, wherein said lock pawl (9) comprises biasing means (25) for elastically and rotationally biasing said lock pawl (9) to maintain the engagement with said engagement portion (30) and said lock releasing means (17) removes the engagement with said engagement portion (9) by rotating said lock pawl (9) against the biasing force of said biasing means (25). The portable terminal computer according to claim 2, further comprising connector cover detecting means (40) for detecting the connector cover (12) being opened or closed, and lock detection means (42) for detecting a lock of the lock pawl (9). The portable terminal computer according to claim 6, wherein said main body (1) includes power supply controlling means (32) and said power supply controlling means (32) controls on/off of a power supply in response to the output signal which said main body (1) receives from said connector cover detecting means (40) or said lock detecting means (42). A portable terminal computer according to claim 1, wherein said main body (1) having a connector (39), the connector (15) of said communication unit (6) connected to said connector (39), and said communication unit (6) further includes : lock detecting means (4) for detecting operation of said lock pawl (9) and for outputting a signal to the main body (1), and said main body (1) further includes: a connector cover (12) for opening and closing a connector opening (28) outwardly exposing said connector (39), connector cover detecting means (40) for detecting operation of said connector cover (12) to output a signal to said main body (1), and power supply controlling means (32) responsive to an output signal of said lock detecting means (42) or said connector cover detecting means (40) to stop or start a power supply to said main body (1). The portable terminal computer according to claim 8, wherein said connector cover detecting means (40) of said main body (1) outputs to said main body (1) an off instruction signal and an on instruction signal when the connector cover (12) is fully opened and it is completely closed, respectively, said lock detecting means (42) of said communication unit (6) outputs an off instruction signal and an on instruction signal when the lock by said locking pawl (9) is incomplete and it is complete, respectively, said power supply control means (32) stops supplying a power when said main body (1) receives the off instruction signal and starts supplying a power when said main body (1) receives the on instruction signal.

Inventors: TANAKA MASAKAZU, TATSUMI TAKASHI, TANAKA, MASAKAZU, TATSUMI, TAKASHI
Applicants: SHARP KK, SHARP KABUSHIKI KAISHA
Application year: 1990
Main classification: G06F15
IPC codes: G06F1