VCSEL Array Imager Cooling for Tight-Pitch High-Resolution Printing
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Solution Overview
Problem
Existing semiconductor laser arrays face challenges in achieving high power output while maintaining tight-pitch packing and resolving thermal crosstalk issues, which are essential for applications like high-resolution printing and lidar systems.
Innovation Solution
The development of independently-addressable VCSEL architectures with improved laser array designs, chip tiling, and advanced mounting and cooling architectures, including direct die attachment to a 3D submount with integrated cooling channels, and the use of selfoc lens arrays, enables high power output with reduced size and complexity, addressing thermal management and tight-pitch packing requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If VCSELs are packed into tight-pitch arrays to achieve high resolution (300-1200 DPI), then digital addressability and resolution are improved, but thermal crosstalk between adjacent lasers increases and thermal management becomes problematic
Solution Approach 1:
The patent divides the thermal management system into multiple independent cooling channels, with each channel dedicated to specific regions of the VCSEL array. This segmentation allows localized thermal control, reducing thermal crosstalk between adjacent lasers while maintaining high resolution packing.
Solution Approach 2:
The patent implements region-specific cooling strategies by providing different cooling channel configurations for different areas of the VCSEL array. High-power regions receive enhanced cooling, while lower-power regions use standard cooling, optimizing thermal management without compromising overall resolution.
2Power
If VCSEL aperture size is increased to achieve high power output (50 mW), then laser power is improved, but device size increases and tight-pitch packing becomes difficult
Solution Approach 1:
The patent transitions from planar cooling to three-dimensional cooling channels that extend vertically through the device structure. This dimensional change allows efficient heat removal from high-power VCSELs without increasing the lateral footprint, enabling tight-pitch packing while maintaining 50 mW output power.
Solution Approach 2:
The patent nests cooling channels within the device structure, integrating thermal management pathways inside the existing VCSEL array architecture. This nesting approach provides effective cooling for high-power lasers without adding external bulk, maintaining compact device dimensions.
3Temperature
If cooling channels and electrical contacts are added to VCSEL structure, then thermal management is improved, but device complexity and overall size increase
Solution Approach 1:
The patent merges multiple cooling channels into a unified integrated cooling structure that serves the entire VCSEL array. By combining thermal management functions into a single coordinated system rather than separate channels for each laser, the design reduces overall structural complexity while maintaining effective thermal control.
Solution Approach 2:
The patent designs the cooling channel structure to serve multiple functions simultaneously: thermal management, structural support, and electrical isolation. This multi-functionality reduces the need for separate dedicated components, thereby reducing device complexity while maintaining comprehensive thermal management.
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 solution allows for high-resolution digital addressability up to 1200 DPI, efficient thermal management, and reduced size and complexity in printing systems, enhancing the performance and reliability of semiconductor laser arrays in various applications.
Implementation Method 1
VCSELs are semiconductor-based lasers that emit light perpendicular to a substrate
Implementation Method 2
The aggregate electrical power drop from a large number of high power lasers operating within a small region can lead to a high thermal load density that must be dissipated
Implementation Method 3
improved mounting and cooling architectures, including direct die attachment to a 3D submount with integrated cooling channels
Data Source
AI summary
A laser imager for a printing system, comprising a plurality of independently addressable surface emitting lasers arranged in a linear array on a common substrate chip and including a common cathode and a dedicated control channel associated with an address trace line for each laser of the plurality of independently addressable surface emitting lasers, and optical elements arranged in a linear lens array configured to capture and focus light from the plurality of independently addressable surface emitting lasers onto a imaging member, wherein the plurality of independently addressable surface emitting lasers arranged in a linear array and the optical elements arranged in a linear lens array operate together to image the imaging member.