Abstract: A chip card retaining mechanism for retaining a chip card (40) mounted in an electronic device is provided. The electronic device includes a housing (10) having a battery compartment (14) defined therein. The chip card retaining mechanism includes a locking member (30). The locking member is securely mounted on the receiving portion. The locking member and a surface of the housing cooperatively form a receiving cavity therebetween for receiving the chip card therein and locking the chip card in the receiving cavity. A first end of the locking member and a surface of the housing cooperatively form an opening for inserting the chip card.

Abstract: A chip card retaining mechanism for retaining a chip card (50) mounted in an electronic device, the electronic device including a housing (10). The chip card retaining mechanism includes a receiving portion, and a locking member (20). The receiving is formed on the housing for fittingly receiving the chip card therein. The locking member is slidably mounted on the housing and positioned over the receiving portion such that if the chip card is received in the receiving portion, the locking member stably locks the chip card in the receiving portion.

Abstract: A battery cover mechanism comprises a battery cover (10), a housing (20) and a hinge mechanism (30). The battery cover has an installing side (101) and a movable side (102) opposite to the installing side. The housing includes a first surface (201) and a second surface (202) that is opposite to the first surface, and the housing defining a receiving chamber (21) in the first surface. The hinge mechanism rotatably mounts the installing side to the housing, and the cover is rotatable to cover or uncover the receiving chamber.

Abstract: A shield (30) for shielding electronic components mounted on a printed circuit board (20) disposed within a housing (10) for an electronic device. The shield includes a top wall (32) and a circumferential sidewall (34). The circumferential sidewall extends from peripheral edges of the top wall toward a side of the top wall. The circumferential sidewall and the top wall cooperatively form a shield cavity (38) for shielding electronic the electronic components provided on the printed circuit board. The shield is integrally formed with an inner surface of the housing.

Abstract: A portable electronic device (80) has a battery cover (100) and a housing (300) releasably mounted with a battery cover latching assembly (200). The battery cover has a receiving hole (114). The housing has a positioning member (316). The battery cover latching assembly includes a latching member (201) and a resilient member (202). The latching member has a locking portion (2019). The resilient member has a first end (2021) and a second end (2022). The first end is mounted in the latching member. The second end is mounted with the battery cover. The latching member is installed in the receiving hole. The locking portion is engaged with the positioning member thereby mounting the battery cover to the housing. When the latching member is forced to move relative to the battery cover, the resilient member is twisted thereby making the latching member to move in an opposing direction.

Abstract: An exemplary battery cover latching assembly (80) is used in a portable electronic device (100). The portable electronic device has a battery cover and a housing releasably mounted with the battery cover latching assembly. The housing has a cavity. The battery cover latching assembly includes a latching member, a first magnetic member, and a second magnetic member. The latching member is received in the cavity of the housing and is slidable in a first direction. The first magnetic member is mounted to the latching member. The second magnetic member is mounted to the housing. The second magnetic member cooperates with the first magnetic member to create force acting in the first direction to enable the latching member to mount the battery cover to the housing.

Abstract: A holder for holding a surface contact card (40) includes a main body (10), a latch (20), a fixing portion (18) and an elastic element (30). The main body defines a receiving groove (16) and a sliding groove (17). The receiving groove is located at one side of the main body. The sliding groove is configured for receiving the surface contact card therein. The latch engages the receiving groove and selectably encloses one end of the surface contact card. The fixing portion is provided on the opposite side of the main body adjacent to the sliding groove. The elastic element sets in the fixing portion and configures for resisting the other end of the surface contact card. The elastic element provides a force allowing removal of the surface contact card.

Abstract: A battery (10) includes two end surfaces and two side surfaces. One of the two end surfaces and the two side surfaces form a groove (18) pressed by a user so as to detach the battery from a housing (20). The groove does not effect the size of the battery, and the battery is easy to detach. This structure increases the convenience of user operation.

Abstract: A hinge assembly (100) includes a first magnetic member (10), and a second magnetic member (20). The first magnetic member is a hollow tube with an open end. The first magnetic member has a first face (162) and a second face (164) at a first end (122) thereof The first face and the second face have opposing polarities. The second magnetic member is a cylinder. The second magnetic member is received in the first magnetic member in a such a manner as to be rotatable relative to the first magnetic member. The second magnetic member has a third face (242) and a fourth face (244) at a first end thereof adjacent the first end of the first magnetic member. The third face and the fourth face have opposing polarities.

Abstract: A hinge assembly (100) includes a sleeve (10), a first magnetic member (20), a second magnetic member (20), and a locking member (40). The sleeve is hollow with an open end. The first magnetic member has a first face (242) and a second face (444) at a first end (232) thereof. The first face and the second face have opposing polarities. The second magnetic member is a cylinder. The second magnetic member is received in the sleeve and rotatable relative to the first magnetic member. The second magnetic member has a third face (342) and a fourth face (344) at an end thereof facing the first end of the first magnetic member. The third face and the fourth face have opposing polarities. The locking member is disposed at the open end of the sleeve and fixing connected with sleeve.

Abstract: A foldable electronic device (100) has at least two components hinged together by a hinge assembly. The foldable electronic device includes: a cover (10), a rotating element (20), an elastic element (30) and a frame (40), a set of magnetic elements (50) and a body (60). The rotating element has two notches defined therein. The elastic element has a latching portion. The elastic element is fixed in the rotating element. The frame slidably engages with the rotating element. The frame is engaged with the cover. The rotating element rotatably connects with the body. The magnetic elements make the cover close relative to the body. When the latching portion of the rotating element engages in different notches of the rotating element, magnetic force between the magnetic elements decreases so as to open the cover relative to the body.

Abstract: A multi-section hinge mechanism includes a shaft (10), a rotary member (20), and an elastic member (30). The rotary member defines a through hole (26) running through the disk. The shaft is rotatably received in the through hole. The rotary member defines a plurality of concaves (282) in an inner circumferential surface portion thereof. The elastic member includes an elastic arm (32) and a fixing portion. The elastic arm engages in one of the concaves of the rotary member. The shaft non-rotatably connects with the fixing portion of the elastic member.

Abstract: A slide mechanism includes a rack gear (10), a bracket (20), a cam assembly (30), and an elastic member (10). The cam assembly is rotatably mounted on the bracket. The cam assembly includes a pinion gear (322). The pinion gear engages with the rack gear. The elastic member is secured on the bracket for providing an elastic force to the pinion gear.

Abstract: An exemplary hinge assembly (100) includes a shaft (10), a cam member (14), a resilient member (40), a cam (20), and a torsional member (30). The cam member is fixed relative to the shaft. The resilient member is mounted on one end of the shaft. The cam has a second cam portion (22). The cam is slidably and rotatably movable relative to the shaft. The second cam portion is engaged with the first cam portion urged by the resilient member. The torsional member is configured for providing a torsional force between the cam and the shaft.

Abstract: A method for measuring metal ion concentration includes the following steps of: providing a measuring solution having a corrosion inhibitor; adding a specific quantity of metal ion solution into the measuring solution; providing a potential scan device (1); measuring a cyclic voltammetry curve of the measuring solution using the potential scan device at a constant scan rate in a specific potential range, the cyclic voltammetry curve has a peak current; obtaining a linear equation, which indicates a linear relationship of peak current versus a concentration of corrosion inhibitor in standard corrosion inhibitor solution in the specific potential range, the peak current is a peak current of cyclic voltammetry curve of the specific quantity of metal ion solution metal ion in the standard corrosion inhibitor solution in the specific potential range; and determining a concentration of the corrosion inhibitor of the measuring solution by computing the peak current of the cyclic voltammetry curve of the measuring so

Abstract: A method for measuring metal ion concentration includes the following steps of: providing a measuring solution having metal ion; providing a potential scan device (1); measuring a cyclic voltammetry curve of the measuring solution using the potential scan device 1 at a constant scan rate in a specific potential range, the cyclic voltammetry curve has a peak current; obtaining a linear equation, which indicates a linear relationship of peak current versus a concentration of metal ion in standard metal ion solution in the specific potential range; and determining a concentration of the metal ion of the measuring solution by computing the peak current of the cyclic voltammetry curve of the measuring solution into the linear equation.

Abstract: A housing (100) for an electronic device includes a cover (10) and an elastic keypad (12). The cover includes a plurality of keypad openings (102) defined therein. The elastic keypad is integrally formed with the cover. The elastic keypad includes a plurality of keys (120) formed on a front surface thereof, and a plurality of protrusions (126) formed on a back surface thereof. Each of the protrusions aligns with a corresponding one of the keys, received in a corresponding one of the keypad openings. The elastic keypad comprising a contactor (122) attached to each of the protrusions. The present invention also provides a method for making the housing.

Abstract: An engraving apparatus for engraving workpieces includes a sliding assembly (10), a cutting tool assembly (40), and a driving mechanism (30). The sliding assembly includes at least one rail (11) and at least two worktables (13). The worktables are used for carrying the workpieces, and are slidably positioned on the rail. The cutting tool assembly includes a cutter (43). The driving mechanism is used for driving the worktables and the cutting tool assembly.

Abstract: A surface contact card holder (100) includes a body (10), a frame (30) and a sliding groove (14). The frame is configured for carrying a surface contact card therein. The sliding groove is provided on the body for receiving the frame. The frame is slidably received in the sliding groove to allow insertion and removal of the surface contact card.

Abstract: A keypad assembly (20) is described that includes a housing (100) and a keypad (200) connecting with the housing. The housing has a keyhole area (144) formed thereon, and the housing has at least one keyhole (146) defined therein and a groove (148) is placed along a periphery of the keyhole area. The keypad has a key area (201) formed thereon, and the key area has at least one key (202) formed thereon and a projection (204) placed therearound to engage in the groove. A main advantage of the keypad assembly is that it can simplify the configuration of the seal while maintaining a good seal, and it also can reduce the production cost.