摘要:
A device for generating conditioned electrical signals in response to forces applied to the device. The device includes a shaft (11) attached to a substrate (14). Several strain sensitive resistors (16) are mounted on the substrate (14) around the shaft (11) for generating an electrical signal representative of a magnitude and direction of force applied to the shaft by a user. Several apertures (17) are in the substrate (14), each aperture (17) is located between a pair of strain sensitive resistors (16). The apertures (17) concentrate the stress on the resistors (16). A signal conditioning device (20) is mounted to the substrate (14) and is electrically connected to the resistors (16) for conditioning the electrical signal. The signal conditioning device (20) receives the electrical signal in an analog form and provides a conditioned signal as an output in a digital form. The device is mounted to a keyboard base (41). An alternative embodiment is shown using a cavity instead of apertures in the substrate.
摘要:
A resistor network for terminating active electronic devices has low cross-talk noise between the adjoining resistors and the conductors that connect the resistors to other electronic packages. A substrate has a top and a bottom surface. Resistors are located on the top surface. Conductors are also located on the top surface and are electrically connected to each end of the resistors. Vias extend through the substrate and electrically connect to the conductors. Solder spheres are positioned on the bottom surface and are electrically connected to the vias. An end of each of the resistors is electrically connected in common through a common conductor. The commoned resistors are electrically connected to a common via through the common conductor. The resistor network minimizes cross-talk noise between the resistors and provides a high density interconnection.
摘要:
A rotary position sensor operable by rotational engagement with a shaft comprises a magnetic assembly (30) having first and second pole pieces (42,44). A back-strap (46) retains the first and second pole pieces (42,44) in parallel and opposing relationship. A shaft (19) passes through at least one of the pole pieces. The pole piece is held to the shaft by a shaft retainer (22). First and second magnets (34) are disposed on the first and second pole pieces, respectively. A magnetic sensor (37) such as a Hall effect sensor is positioned in an air gap between the pole pieces and operates to provide an output signal representative of the field strength of the magnet as the shaft rotates. The output signal changes magnitude in relation to the relative position of the magnet with respect to the magnetic field sensor.
摘要:
A motor and a rotatable single phase electromagnetic actuator that has a self aligning shaft that allows for misalignment of actuator parts that would lead to excessive bearing surface wearing. Additionally, the actuator has a rotor, having a first rotor surface; a stator, having a slanted bearing surface opposed the first rotor surface; and a bearing device, mounted on and between the first rotor surface and the slanted bearing surface, positioned and shaped to separate the rotor from the stator and to self align on the slanted bearing surface in a position that substantially evenly distributes bearing loading on the bearing device.
摘要:
A combustible gas detector or sensors having a multi-level sensitivity circuitry. The gas detector has a bridge circuit for outputting voltages indicative of gas concentrations contacting the bridge circuit. There is a power supply node electrically coupled to one end of the bridge circuit. There is also a voltage control circuit, coupled between the bridge circuit and the power supply node for controlling when at least a low and high input voltage level is supplied to the bridge circuit so that the bridge circuit has at least two levels of gas concentration discernability. The bridge circuit outputs distinguishable voltage levels for high gas concentrations in response to receiving the low voltage level. Additionally, the bridge circuit outputs distinguishable voltage levels for low gas concentrations in response to receiving the high voltage level.
摘要:
A pointing stick 10 for controlling the positioning, movement and operation of a cursor 209 on the display screen 213 . The pointing stick 10 includes a solid structure 20 having a base 24 and a shaft 22 integrally formed with and perpendicular to the base. A film 30 is mounted on the base and a sensor 32 is mounted on the film. The sensor is capable of sensing strains on the base that are indicative of the direction that the shaft is being forced. The sensor functions by using strain sensitive resistors that change resistance based upon the amount of strain that they are subject to. The strain sensitive resistors are coupled to circuitry that will produce signals in response to the strain on the gages. The resulting signals are used to either control the movement of the cursor around the display screen, or to do what is commonly called "clicking" a mouse button for selection of items or dragging of items on the display screen. A cavity 26 may be placed on the base and located circumferentially around the shaft. The recessed area or cavity area may be more flexible than the remaining base structure and typically the film having a sensor mounted thereon may be bonded to the side of the base opposite the cavity. The pointing stick may be used on a keyboard having a home-row of keys locating fingers of a user during typing. The pointing stick can be used to select an Item on a display screen or move a cursor or similar object on the display screen using only one finger of one hand. During this time the remaining fingers of both hands may reside inactive on the home-row of keys.
摘要:
A motor and a rotatable single phase electromagnetic actuator that has a self aligning shaft that allows for misalignment of actuator parts that would lead to excessive bearing surface wearing. Additionally, the actuator has a rotor, having a first rotor surface; a stator, having a slanted bearing surface opposed the first rotor surface; and a bearing device, mounted on and between the first rotor surface and the slanted bearing surface, positioned and shaped to separate the rotor from the stator and to self align on the slanted bearing surface in a position that substantially evenly distributes bearing loading on the bearing device.
摘要:
A rotatable axial thrust bearing having an upper race (12) upper race flat region (48) and an upper race rounded ball bearing retainer section (46); a lower race (14) having a lower race flat region (42) and a lower race rounded ball bearing retainer section (44); an annular retainer (16) for retaining the ball bearing and the lower and upper race without interfering with the lower race when the lower race is placed on a sloped surface (24). The annular retainer is made up of an upper race retainer lock portion (54) and an outer ball bearing retainer portion positioned on an outer periphery of the thrust bearing. The annular retainer additionally consists of a lower race retainer lock (36) , and an inner ball bearing retainer portion (40) positioned on an inner periphery of the thrust bearing.
摘要:
An IC package design and method of making the package design that provides anti-bridging between metal leads. The anti-bridge IC package design extends bottom covercoat material out onto the leads a sufficient distance to prevent solder bridging that typically takes place in cup regions of gull wing shaped leads. A further feature of the invention is to provide a method of applying covercoat material to the IC and the leads in the same process step. A resilient material wheel and related manufacturing equipment is used to apply a single covercoat material, like epoxy, in a single step that serves as both the bottom covercoat and lead anti-bridge coat for the IC.