Optical Module Transmitting Member Warp Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Known optical modules experience cracking issues with their transmitting members, which affects the reliability and design flexibility of the modules.
Innovation Solution
The optical module design includes a transmitting member joined to a cap member with controlled distortion, using a material like glass, and a cap member shape that restricts the position of the through-hole, ensuring even distortion and reducing the likelihood of cracking by fixing the transmitting member at specific surfaces with a low melting point glass for airtightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the transmitting member is made from a material that transmits laser light, then light transmission is enabled, but cracking occurs reducing reliability
Solution Approach 1:
The patent controls the warp amount of the transmitting member within a specific range (0.03μm or more and 0.15μm or less) to prevent cracking while maintaining light transmission. By adjusting the warp parameter to an optimal value, the patent resolves the contradiction between enabling light transmission and preventing cracking.
Solution Approach 2:
The patent applies a coating layer on the transmitting member to cushion and distribute stress before cracking can occur. This preventive measure addresses the cracking issue by providing stress relief in advance, allowing the transmitting member to maintain its light transmission function without failing.
2Reliability
If the transmitting member is joined to the cap member, then airtightness is improved, but distortion and cracking risk increase
Solution Approach 1:
The patent optimizes the joining position of the transmitting member to the cap member, specifying that it should be joined at a position where the warp amount is within the controlled range. This parameter optimization ensures airtightness is achieved while minimizing distortion and cracking risk.
Solution Approach 2:
The patent applies a coating layer on the transmitting member before joining it to the cap member. This coating provides stress cushioning that prevents distortion and cracking during the joining process, allowing airtight sealing without compromising the transmitting member's integrity.
3Strength
If the warp amount of the transmitting member is increased, then stress distribution improves, but cracking occurs reducing durability
Solution Approach 1:
The patent identifies and controls the warp amount parameter within an optimal range (0.03μm or more and 0.15μm or less) to achieve proper stress distribution without causing cracking. This precise parameter control resolves the contradiction between improving stress distribution and maintaining durability.
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
This design effectively suppresses cracking of the transmitting member, maintaining module reliability and design freedom while ensuring high airtightness and durability.
Implementation Method 1
The transmitting member is formed of a material that transmits light with a wavelength corresponding to the optical semiconductor device
Implementation Method 2
fixing the transmitting member at specific surfaces with a low melting point glass for airtightness
Implementation Method 3
The transmitting member is joined to the cap member at the first surface or the second surface
Data Source
AI summary
An optical module includes a transmitting member. The transmitting member is fixed to a cap member so as to cover a through-hole. On the assumption that the height of one point on a first surface in a state in which the transmitting member is detached from the cap member is zero and the direction toward the outside of the optical module is a positive direction, the amount of warp that is a difference between the displacement at the central point and the displacement at a standard point, on the first surface, corresponding to a reference point, on the projection image, away from a center of gravity by a particular distance is different between a first geodesic line and a second geodesic line, the displacement being a height of the one point in a direction of the optical axis in a state in which the transmitting member is fixed to the cap member. The transmitting member is joined to the cap member at the first surface or the second surface.