Variable-Interval Laser Array Wiring for Compact High-Density Design
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Solution Overview
Problem
The challenge is to create a two-dimensional surface-emitting laser array that can accommodate more elements in a smaller area while maintaining high resolution and speed, which is difficult due to limitations in arranging electrical wirings in a compact array with equal interstice intervals.
Innovation Solution
The solution involves designing an electrical wiring pattern first, followed by optimizing the element pattern, allowing for varying grid intervals based on the number of electrical wirings, with larger intervals where more wirings pass through and smaller intervals where fewer wirings are present, enabling a more efficient arrangement of elements in a compact area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the array area is decreased to achieve compact size, then the device becomes more compact, but it becomes difficult to arrange multiple electrical wirings in the array interstices
Solution Approach 1:
The patent applies local quality by making the interstice width variable rather than uniform. Specifically, the interstice width is set to be larger in regions where multiple electrical wirings need to pass through (such as near pad electrodes) and smaller in regions where fewer wirings are present. This localized adjustment of interstice width allows multiple wirings to be arranged in compact areas without excessive spacing, while maintaining tight spacing in areas where it is not needed, thus resolving the contradiction between compact array area and ease of wiring arrangement.
2Productivity
If the number of elements is increased to achieve higher resolution and speed, then the imaging performance improves, but the array area increases making the device less compact
Solution Approach 1:
The patent applies parameter changes by varying the interstice width parameter across different regions of the array. By changing the interstice width parameter locally based on the wiring density requirements, the patent enables tighter packing of elements in regions with fewer wirings while providing sufficient space for multiple wirings in regions where they are needed. This parameter variation allows a higher number of elements to be accommodated in a smaller overall array area, thus improving productivity without proportionally increasing the array area.
3Ease of manufacture
If equal interstice intervals are used for simplicity, then the manufacturing process is simpler, but the density of elements is reduced and the array area increases
Solution Approach 1:
The patent replaces the uniform interstice interval approach with a local quality approach where interstice width is optimized for each specific region. Instead of using equal intervals throughout the array, the interstice width is locally adjusted to match the wiring requirements of each region. This allows maximum element density in regions with simple wiring needs while providing adequate spacing in regions requiring multiple wirings, thereby reducing the overall array area compared to a uniform interval design.
Data Source
AI summary
Provided is a two-dimensional surface-emitting laser array that enables to dispose more elements in a smaller area and enables compact size, high resolution, and high speed thereof. The two-dimensional surface-emitting laser array includes surface-emitting laser elements arranged in a two-dimensional manner of m rows and n columns (m is an integer of two or larger, and n is an integer of three or larger). The interval between mesas for arranging electrical wirings for individually driving the surface-emitting laser elements is assigned so that the interval in the m row direction increases according to the number of the electrical wirings passing through between the mesas.