Optical Circuit Light Shielding Plate Overhang Design
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Solution Overview
Problem
The attachment of a light shielding plate with adhesive to a transparent plate in wavelength selective switches can cause adhesive protrusions that interfere with the optical path, leading to light loss and increased noise due to irregular light reflection and cross-talk.
Innovation Solution
The light shielding plate is designed with a projecting portion in an overhang shape towards the center of the opening, concealing the adhesive protrusion when adhered to the transparent plate, thereby preventing interference with the optical path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a light shielding plate is attached to a transparent plate with adhesive to shield stray light, then stray light is suppressed, but adhesive protrusions interfere with the optical path causing light loss and noise
Solution Approach 1:
The light shielding plate is designed with an overhang structure that extends in the depth dimension (toward the optical path) to create a shadow region. This three-dimensional configuration allows the plate to block adhesive protrusions from entering the optical path while maintaining the two-dimensional light shielding function, thus preventing light loss without compromising stray light suppression.
Solution Approach 2:
The light shielding plate is positioned and configured before the adhesive is applied and cured. The overhang structure is pre-formed to anticipate and prevent adhesive protrusions from reaching the optical path, eliminating the need for post-assembly adjustments or additional shielding measures.
2Object-affected harmful factors
If a light shielding plate is attached with adhesive to shield stray light, then stray light is suppressed, but adhesive protrusions cause cross-talk through irregular light reflection
Solution Approach 1:
By extending the light shielding plate in the depth dimension to form an overhang, the plate creates a protective shadow region that prevents adhesive protrusions from entering the optical path. This eliminates irregular light reflection and cross-talk while maintaining the original light shielding effectiveness.
3Stability of the object's composition
If a light shielding plate is attached with adhesive to the transparent plate, then the light shielding plate is secured, but adhesive protrusions affect the alignment of incident light with MEMS mirrors
Solution Approach 1:
The overhang structure extends the light shielding plate in the depth dimension to create a shadow region that blocks adhesive protrusions from entering the optical path. This maintains secure attachment while preserving precise light alignment with MEMS mirrors by preventing adhesive interference.
Solution Approach 2:
The overhang structure is pre-configured on the light shielding plate before assembly to anticipate and prevent adhesive protrusions from affecting light alignment, ensuring manufacturing precision is maintained without requiring post-assembly realignment.
Data Source
AI summary
Disclosed is an optical circuit including a transparent plate, which is light-transmittable, and a light shielding plate, which is adhered to the transparent plate with an adhesive and has an opening through which incident light passes, and in which the aspect facing to the opening has, on the side opposite to the transparent plate, projections in an overhang shape toward the center of the opening.