Electronic focus adjustment for c-mount lens using PCB piezoelectric motor
AssigneeDatalogic IP Tech S.R.L.
InventorsMatteo Falasca, Alessandro Brunetta
Life of this patent
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Abstract
An optical imaging system, such as a scanner system for imaging machine-readable indicia may include a lens device, an adapter ring, and a PCB piezoelectric motor. The lens device may include an adjustable optical component operably coupled to a rotatable feature. The adapter ring may be engaged to the rotatable feature of the lens device so as to control movement of the rotatable feature. The PCB piezoelectric motor may include a stator mounted thereto, and a rotor configured to rotate relative to the stator. The rotor may be coupled to the adapter ring so that applying rotational energy to the stator causes the adapter ring to rotate, thereby causing the adjustable optical component to be adjusted.
Claims22
An optical imaging system, comprising:
- a lens device including an adjustable optical component moveable via a rotatable feature;
- an adapter ring engaged to the rotatable feature of the lens device;
- a printed circuit board (PCB) piezoelectric motor including:
- a PCB defining an opening extending therethrough;
- and
- a stator mounted to the PCB along a perimeter of the opening;
- and
- a rotor configured to rotate relative to the stator, the rotor disposed axially between the adapter ring and the stator, the rotor coupled to the adapter ring so that applying rotational energy to the stator causes the rotor and the adapter ring to rotate about the opening of the PCB, thereby moving the rotatable feature to cause the adjustable optical component to be adjusted.
A scanner assembly, comprising:
- a scanner support structure;
- a lens assembly fixedly coupled to the scanner support structure, the lens assembly including:
- a lens device;
- and
- a focus ring;
- an imaging device positioned to receive light through the lens device;
- and an electronic control system including:
- a printed circuit board (PCB) electrically coupled to the imaging device, the PCB defining an opening extending therethrough;
- a processor disposed on the PCB and configured to process images from the imaging device;
- and
- a piezoelectric motor including:
- a stator mounted to the PCB along a perimeter of the opening;
- and
- a rotor ring that is disposed axially between the focus ring and the stator, the rotor ring rotationally coupled to the focus ring and electromagnetically coupled to the stator so as to rotate the focus ring about the opening of the PCB when a rotational current is applied to the stator.
A method of operating an optical imaging system, comprising:
- receiving, by a controller, an optical parameter from an imaging device;
- generating, by the controller, based on the optical parameter, a drive signal to command rotation of a rotor of a printed circuit board (PCB) piezoelectric motor, the PCB piezoelectric motor further including:
- a PCB defining an opening extending therethrough;
- an adapter ring coupled to the rotor;
- a stator mounted to the PCB along a perimeter of the opening, wherein the rotor is disposed axially between the adapter ring and the stator;
- and
- applying rotational energy to a stator of the PCB piezoelectric motor in response to the drive signal to cause the rotor to rotate the adapter ring that is fixedly coupled to a rotatable feature of a lens device about the opening of the PCB so as to adjust an optical component of the lens device until the optical parameter satisfies an optical parameter criteria.
Dependencies are inferred from the claim text.