Back to results
US 10,567,637 B2Granted
Methods and apparatus for autofocus
AssigneeSemiconductor Components Industries, LLC
InventorsYoshihisa Tabuchi, Takeshi Kura
Life of this patent
Estimating the term…
Abstract
Various embodiments of the present technology may comprise a method and apparatus for autofocus. In various embodiments, the methods and apparatus may decrease a settling time of a lens by increasing the target position gradually, varying the gain of a PID controller, and adding a kick pulse to a position signal.
Claims20
An autofocus apparatus in communication with an image signal processor, comprising:
- an actuator;
- and
- a driver circuit in communication with the actuator and configured to:
- receive an initial target position from the image signal processor;
- generate an intermediate target position according to the initial target position;
- generate a deviation value according to the intermediate target position and a detected position of the actuator;
- and
- generate a drive signal according to the deviation value and at least one of:
- a gain control circuit and a kick pulse circuit.
6 more elements
An autofocus apparatus in communication with an image signal processor, comprising:
- an actuator;
- and
- a driver circuit in communication with the actuator and configured to:
- computing a deviation value according to a target value and a first position signal;
- computing a kick pulse signal based on the computed deviation value;
- and
- generate a second position signal according to the computed kick pulse signal.
4 more elements
An autofocus apparatus in communication with an image signal processor, comprising:
- an actuator;
- and
- a driver circuit in communication with the actuator and the image signal processor, and configured to:
- receive a first position signal from the image signal processor;
- generate a second position signal according to the first position signal;
- and
- generate a deviation value based on the second position signal and an actual position of the actuator;
- wherein the driver circuit comprises:
- a gain control circuit configured to receive the deviation value and apply a gain to the deviation value;
- and
- a PID controller coupled to an output of the gain control circuit to further adjust the deviation value.
8 more elements
Dependencies are inferred from the claim text.