Light Irradiation Apparatus with Periodic Blocker-Irradiator Pattern
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Solution Overview
Problem
Existing optical evaluation apparatuses are bulky due to the need for large illumination devices to image curved surfaces, which increases the size of the apparatus and complicates the imaging process.
Innovation Solution
A light irradiation apparatus with a configuration of alternating line-shaped light blockers and irradiators, where the irradiators overlap the blockers to form a periodic pattern, allowing for efficient light transmission and imaging without obstructing the field of view, thereby reducing the apparatus size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a non-transmission-type illumination device is used to image stripe pattern light on an object, then the illumination device can be arranged without blocking the field of view of the imaging device, but the size of the illumination device must be large to image regular reflected light from the whole inspection target region at once, especially for curved surfaces
Solution Approach 1:
The illumination device is divided into multiple independent line-shaped light irradiators arranged in a periodic pattern. Each light irradiator illuminates a specific line region on the object, and by scanning these line regions sequentially, the entire inspection target region is imaged. This segmentation allows for a compact illumination device design while maintaining the capability to image curved surfaces effectively.
2Measurement precision
If a large illumination device is used to image regular reflected light from the whole inspection target region at once, then the imaging capability is improved, but the size of the optical evaluation apparatus increases
Solution Approach 1:
The illumination device incorporates a scanning mechanism that moves the array of line-shaped light irradiators across the inspection target region. Instead of illuminating the entire region simultaneously with a large device, the compact illumination device scans line-by-line through the target region, dynamically building up the complete image over time. This dynamic approach enables full-field imaging capability with a compact apparatus.
3Use of energy by moving object
If line-shaped light blockers and light irradiators are arranged in an alternating periodic pattern, then light transmission efficiency is improved and field of view obstruction is reduced, but the arrangement complexity increases
Solution Approach 1:
The design extracts only the essential light transmission function by using simple alternating light blockers and light irradiators. Rather than complex illumination systems, the patent removes unnecessary components and retains only the periodic alternating pattern needed to achieve efficient light transmission while maintaining a compact form factor. This extraction simplifies the overall device architecture.
Data Source
AI summary
A light irradiation apparatus for irradiating an object with light, includes a plurality of line-shaped light blockers arranged at a predetermined center-to-center interval, and configured to at least partially block light, and a plurality of line-shaped light irradiators arranged to overlap some of the plurality of light blockers so as to irradiate the object with light. The plurality of light irradiators are arranged to form a period not less than twice as large as the center-to-center interval of the plurality of light blockers.