Imaging Plane Tilt Control for Simultaneous Focus Adjustment
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Solution Overview
Problem
Conventional methods for tilting an image sensor relative to the optical axis in imaging systems face challenges in simultaneously performing focus control and tilt control, resulting in prolonged completion times due to the need for sequential focus and tilt adjustments.
Innovation Solution
A control apparatus and method that includes a focus control unit, a tilt control unit, and a determination unit to perform focus and tilt controls based on distinct evaluation areas of the image signal, allowing simultaneous and efficient adjustment of the imaging plane.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If tilt control of the imaging plane is performed, then the focal plane can be adjusted to achieve long depth of field, but the evaluation value for autofocus control changes, preventing simultaneous focus and tilt control
Solution Approach 1:
The patent divides the image signal into multiple evaluation areas, with different areas used for focus control and tilt control respectively. This segmentation allows both controls to operate independently and simultaneously without interfering with each other's evaluation values.
Solution Approach 2:
The patent applies different quality requirements to different regions of the image signal. Specifically, certain evaluation areas are optimized for focus evaluation while others are optimized for tilt evaluation, allowing each control function to operate with its own specialized evaluation criteria.
2Manufacturing precision
If focus control is performed after tilt control adjusts the focal plane, then proper focus can be achieved, but the total control time is prolonged
Solution Approach 1:
The patent performs preliminary setup by designating multiple evaluation areas in advance that can be used for both focus and tilt control. This allows both controls to start simultaneously without waiting for sequential completion, as the evaluation framework is already in place.
Solution Approach 2:
The patent enables continuous and simultaneous operation of both focus control and tilt control by using multiple evaluation areas. Instead of stopping one control to perform the other, both controls continue operating concurrently, maximizing system productivity.
3Device complexity
If the same evaluation area is used for both focus control and tilt control, then the control system is simpler, but both controls cannot be performed simultaneously due to evaluation value changes
Solution Approach 1:
The patent segments the image signal into multiple evaluation areas, assigning specific areas for focus control and others for tilt control. This segmentation enables both controls to operate simultaneously with their own dedicated evaluation metrics.
Solution Approach 2:
The patent transitions from using a single evaluation area (one-dimensional approach) to using multiple evaluation areas (multi-dimensional approach). This dimensional expansion allows focus and tilt controls to operate in parallel without interfering with each other's evaluation processes.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables quick and simultaneous focus and tilt control of the imaging plane, reducing the time required for focal plane adjustment and improving the depth of field in imaging systems.
Implementation Method 1
an image sensor configured to photoelectrically convert an optical image formed through an imaging optical system and outputs an image signal
Data Source
AI summary
A control apparatus includes a focus control unit configured to perform a focus control based on an image signal, a tilt control unit configured to control a tilt of an imaging plane based on the image signal, and a determination unit configured to determine a first evaluation area of the image signal used for the focus control and a second evaluation area of the image signal used for the tilt control in performing both the focus control and the tilt control. At least one processor or circuit is configured to perform a function of at least one of the units.