Abstract:
A drive mechanism (16A, 16B) configured to drive a thermally isolated actuator (30) between two positions. The drive mechanism includes a rotary actuated motor (18) configured to rotatably drive a motor member (20), and a drive member (22) coupled to the motor member and having a drive arm (24, 42) configured to responsively move from a first position to a second position upon rotation of the motor member. An actuator (30) is responsive to movement of the drive arm (24) moved from the first position to the second position. A drive circuit (60) is configured to generate a pulse width modulated (PWM) drive signal (70) configured to controllably drive the motor, the PWM drive signal having a first duty cycle (Phase 1) configured to advance the drive arm from the first position, and having a second duty cycle (Phase 2) different than the first duty cycle as the drive arm approaches the second position. The drive signal may be removed (Phase3) before the drive arm (42) engages a hard stop (54). The drive mechanism may comprise at least one sensor (40) configured to determine a position of the drive arm (42) proximate the first position and proximate the second position. The actuator is thermally isolated from the drive arm (42) in both the first position and the second position.
Abstract:
A device (10) operable in a ultra-high vacuum and in a cryogenic environment. The device has bi-stable solenoid motors (18) configured to drive a shutter assembly (12) defining an aperture (15) having a first shape when the motors are each disposed in the respective first position, and wherein the aperture has a second shape when the motors are each disposed in the respective second position. Actuators (30) responsive to the motors are thermally isolated from the cryogenic shutter assembly except when the motors position the shutter assembly to change a shape of the aperture. The device is suitable for use in FLIR and other thermally sensitive devices.
Abstract:
A shutter assembly (12) comprising a first planar member (70) and a second planar member (72) opposed from one another and forming a sleeve having a cavity (80) therebetween, the sleeve having a pair of side rails (78) adjacent the cavity along sides of the sleeve. A first shutter member (14) having a first end (92) is disposed in the cavity and slidingly disposed along one of the side rails, and a second shutter member (14) having a second end (92) is disposed in the cavity and slidingly disposed along the other side rail. The first end is opposed to the second end and is configured to be selectively advanced towards, and retracted from, the second end so as to define an aperture (15) therebetween having a first shape when disposed in a first position, and wherein the aperture has a second larger shape when the first end is disposed in a second position. The first shutter member and the second shutter member maintain a thermal contact with the side rails and the planar members in all positions. The shutter assembly is well suited to be used at a cryogenic temperature and in a high vacuum environment.
Abstract:
A drive mechanism (16A, 16B) including a rotary actuated motor (18) configured to rotatably drive a drive arm (24) between a first position to a second position and an actuator (30) responsive to movement of the arm, wherein the actuator is thermally isolated from the arm in both the first position and the second position to create a thermal barrier. The drive arm is configured to engage and advance the actuator between the first position and the second position, while remaining physically spaced from the actuator in the first position and the second position. The drive arm includes a recess (26) such as an opening, wherein the actuator has a member (30, 34) configured to reside in the recess and remain thermally isolated from the arm in both the first position and the second position. In one preferred embodiment, a shutter (14) of an imaging device (10) is positioned in response to the actuator, which shutter remains thermally isolated from the motor and arm. Other devices may be driven as well, such as switches.
Abstract:
An apparatus includes a first blade (206) configured to be coupled to a first magnet (220) and a second blade (208) configured to be coupled to a second magnet (220). At least one of the blades has at least one cutout (214). The apparatus also includes electromagnetic motors (112a, 112b) configured to generate different electromagnetic fields to (i) cause the magnets to move the blades into a first configuration and (ii) cause the magnets to move the blades into a second configuration. The blades are separated to form a larger aperture in the first configuration, and the at least one cutout in the blades forms a smaller aperture in the second configuration. The apparatus may further include a cover plate (210) and a base plate (212). The base plate can include an opening that defines the larger aperture and blade stops (302) and stop pins (402) configured to stop movement of the blades.
Abstract:
A drive mechanism (16A, 16B) configured to drive a thermally isolated actuator (30) between two positions. The drive mechanism includes a rotary actuated motor (18) configured to rotatably drive a motor member (20), and a drive member (22) coupled to the motor member and having a drive arm (24, 42) configured to responsively move from a first position to a second position upon rotation of the motor member. An actuator (30) is responsive to movement of the drive arm (24) moved from the first position to the second position. A drive circuit (60) is configured to generate a pulse width modulated (PWM) drive signal (70) configured to controllably drive the motor, the PWM drive signal having a first duty cycle (Phase 1) configured to advance the drive arm from the first position, and having a second duty cycle (Phase 2) different than the first duty cycle as the drive arm approaches the second position. The drive signal may be removed (Phase3) before the drive arm (42) engages a hard stop (54). The drive mechanism may comprise at least one sensor (40) configured to determine a position of the drive arm (42) proximate the first position and proximate the second position. The actuator is thermally isolated from the drive arm (42) in both the first position and the second position.
Abstract:
A shutter assembly comprising a first planar member and a second planar member opposed from one another and forming a sleeve having a cavity therebetween, the sleeve having a pair of side rails adjacent the cavity along sides of the sleeve. A first shutter member having a first end is disposed in the cavity and slidingly disposed along one of the side rails, and a second shutter member having a second end is disposed in the cavity and slidingly disposed along the other side rail. The first end is opposed to the second end and is configured to be selectively advanced towards, and retracted from, the second end so as to define an aperture therebetween having a first shape when disposed in a first position, and wherein the aperture has a second larger shape when the first end is disposed in a second position. The first shutter member and the second shutter member maintain a thermal contact with the side rails and the planar members in all positions. The shutter assembly is well suited to be used at a cryogenic temperature and in a high vacuum environment.
Abstract:
A drive mechanism (16A, 16B) configured to drive a thermally isolated actuator (30) between two positions. The drive mechanism includes a rotary actuated motor (18) configured to rotatably drive a motor member (20), and a drive member (22) coupled to the motor member and having a drive arm (24, 42) configured to responsively move from a first position to a second position upon rotation of the motor member. An actuator (30) is responsive to movement of the drive arm (24) moved from the first position to the second position. A drive circuit (60) is configured to generate a pulse width modulated (PWM) drive signal (70) configured to controllably drive the motor, the PWM drive signal having a first duty cycle (Phase 1) configured to advance the drive arm from the first position, and having a second duty cycle (Phase 2) different than the first duty cycle as the drive arm approaches the second position. The drive signal may be removed (Phase3) before the drive arm (42) engages a hard stop (54). The drive mechanism may comprise at least one sensor (40) configured to determine a position of the drive arm (42) proximate the first position and proximate the second position. The actuator is thermally isolated from the drive arm (42) in both the first position and the second position.
Abstract:
A device (10) operable in a ultra-high vacuum and in a cryogenic environment. The device has bi-stable solenoid motors (18) configured to drive a shutter assembly (12) defining an aperture (15) having a first shape when the motors are each disposed in the respective first position, and wherein the aperture has a second shape when the motors are each disposed in the respective second position. Actuators (30) responsive to the motors are thermally isolated from the cryogenic shutter assembly except when the motors position the shutter assembly to change a shape of the aperture. The device is suitable for use in FLIR and other thermally sensitive devices.