Angular motor shaft with rotational attenuation
First Claim
1. A linear actuator assembly comprising:
- a linear actuator, the linear actuator including a single motor shaft extending from a base;
the base including a piezoelectric component to selectively oscillate the motor shaft at an ultrasonic frequency;
the motor shaft having a faceted surface which when viewed in cross-section at least a portion of the cross section includes a straight line;
a movable carriage, the carriage including a notch to receive the motor shaft;
where the notch has substantially a V-shape with at least one flat surface and a relief cutaway configured to reduce the amount of surface area contact between the motor shaft and the at least one flat surface;
the carriage being in direct and continuous contact with the motor shaft at the notch wherein the motor shaft'"'"'s facet is in contact with the flat surface of the notch, when the carriage moves linearly along a travel axis; and
a spring assembly coupled to the carriage to urge the motor shaft into contact with the notch of the carriage so as to maintain contact between the motor shaft facet and the flat surface of the notch to inhibit rotation of the motor shaft, the spring assembly contacting the motor shaft at a facet corner configured to reduce the surface area contact between the motor shaft and the spring assembly;
wherein the carriage is supported solely by contact with the motor shaft and the spring assembly.
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Accused Products
Abstract
A linear actuator assembly has a linear actuator including a motor shaft extending from a base with a piezoelectric component oscillate the shaft. The shaft has a faceted surface. A movable carriage has a notch with at least one flat surface that receives the shaft of the linear actuator. The carriage is in direct and continuous contact with the motor shaft at the notch such that the motor shaft'"'"'s facet is in contact with the flat surface of the notch, when the carriage moves linearly along a travel axis. A spring is coupled to the carriage to urge the motor shaft into contact with the notch of the carriage so as to maintain contact between the motor shaft facet and the flat surface of the notch to inhibit rotation of the motor shaft.
399 Citations
20 Claims
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1. A linear actuator assembly comprising:
- a linear actuator, the linear actuator including a single motor shaft extending from a base;
the base including a piezoelectric component to selectively oscillate the motor shaft at an ultrasonic frequency;
the motor shaft having a faceted surface which when viewed in cross-section at least a portion of the cross section includes a straight line;
a movable carriage, the carriage including a notch to receive the motor shaft;
where the notch has substantially a V-shape with at least one flat surface and a relief cutaway configured to reduce the amount of surface area contact between the motor shaft and the at least one flat surface;
the carriage being in direct and continuous contact with the motor shaft at the notch wherein the motor shaft'"'"'s facet is in contact with the flat surface of the notch, when the carriage moves linearly along a travel axis; and
a spring assembly coupled to the carriage to urge the motor shaft into contact with the notch of the carriage so as to maintain contact between the motor shaft facet and the flat surface of the notch to inhibit rotation of the motor shaft, the spring assembly contacting the motor shaft at a facet corner configured to reduce the surface area contact between the motor shaft and the spring assembly;
wherein the carriage is supported solely by contact with the motor shaft and the spring assembly. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
- a linear actuator, the linear actuator including a single motor shaft extending from a base;
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10. A linear actuator assembly comprising:
- a linear actuator, the linear actuator including a single motor shaft extending from a base;
the base including a piezoelectric component;
a flex circuit electrically coupled to the piezoelectric component;
where electrical signals are carried by the flex circuit to selectively cause the piezoelectric element to oscillate the motor shaft at an ultrasonic frequency;
the motor shaft being substantially square having four facets when viewed in cross-section;
a movable carriage, the carriage including a notch to receive the motor shaft;
where the notch is substantially V-shaped having two flat surfaces and a relief cutaway configured to reduce the amount of surface area contact between the motor shaft and the at least one flat surface;
the carriage being in direct and continuous contact with the motor shaft at the notch wherein two of the motor shaft'"'"'s facets are in contact with the two flat surfaces of the V-shaped notch, when the carriage moves linearly along a travel axis; and
a cantilever spring assembly coupled to the carriage to urge two of the motor shaft'"'"'s facets into contact with the two flat surfaces of the substantially V-shaped notch of the carriage so as to maintain contact between the motor shaft facets and the flat surfaces of the notch to inhibit rotation of the motor shaft, the spring assembly contacting the motor shaft at a facet corner configured to reduce the surface area contact between the motor shaft and the spring assembly;
wherein the carriage is supported solely by contact with the motor shaft and the spring assembly. - View Dependent Claims (11, 12, 13)
- a linear actuator, the linear actuator including a single motor shaft extending from a base;
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14. An autofocus imager comprising:
- a linear actuator, the linear actuator including a single motor shaft extending from a base;
the base including a piezoelectric component to selectively oscillate the motor shaft at an ultrasonic frequency;
the motor shaft having a faceted surface which when viewed in cross-section at least a portion of the cross section includes a straight line;
a movable carriage, the carriage including a notch to receive the motor shaft;
where the notch has substantially a V-shape with at least one flat surface and a relief cutaway configured to reduce the amount of surface area contact between the motor shaft and the at least one flat surface;
the carriage being in direct and continuous contact with the motor shaft at the notch wherein the motor shaft'"'"'s facet is in contact with the flat surface of the notch, when the carriage moves linearly along a travel axis;
a spring assembly coupled to the carriage to urge the motor shaft into contact with the notch of the carriage so as to maintain contact between the motor shaft facet and the flat surface of the notch to inhibit rotation of the motor shaft, the spring assembly contacting the motor shaft at a facet corner configured to reduce the surface area contact between the motor shaft and the spring assembly;
wherein the carriage is supported solely by contact with the motor shaft and the spring assembly; and
a lens coupled to the carriage to move linearly with the linear actuator to adjust a focus of the autofocus imager. - View Dependent Claims (15, 16, 17, 18, 19, 20)
- a linear actuator, the linear actuator including a single motor shaft extending from a base;
Specification