Shutter Diverts Laser Energy from DMD
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Solution Overview
Problem
High-intensity line-source lasers used in thermochromic ink printing exceed the heat dissipation capabilities of Digital Micro-Mirror Devices (DMDs), leading to potential damage due to excessive temperature, and current power cycling methods are impractical for laser diode arrays.
Innovation Solution
A shutter-like device is positioned upstream in the laser diode array's light path to divert energy away from the DMD during extended non-imaging periods, using a homogenizer module and actuated by feed-forward image content information to minimize laser energy on the DMD chip.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If high-intensity laser energy is delivered to the DMD chip, then imaging power is improved, but the DMD chip temperature exceeds critical levels causing damage
Solution Approach 1:
A shutter device is introduced as an intermediary component between the laser diode array and the DMD chip. This shutter selectively blocks or redirects laser energy during non-imaging periods, preventing excessive heat accumulation on the DMD chip while allowing full laser power to be used during active imaging periods.
Solution Approach 2:
The shutter operates periodically, switching between blocking and non-blocking states based on imaging requirements. During non-imaging periods, the shutter blocks laser energy to allow the DMD chip to cool down. During imaging periods, the shutter is opened to allow full laser power through, enabling periodic thermal management cycles.
2Productivity
If the DMD chip is operated at 100% power continuously, then productivity is improved, but the chip overheats and becomes damaged
Solution Approach 1:
The shutter is activated in advance during non-imaging periods to block laser energy before the DMD chip temperature reaches critical levels. This preliminary action prevents overheating proactively, allowing the system to maintain higher average power operation without compromising chip reliability.
3Temperature
If laser power is reduced to cool the DMD chip, then temperature is controlled, but imaging quality and power delivery are degraded
Solution Approach 1:
The shutter serves as a mediator that enables complete laser power delivery to the DMD chip during imaging periods by blocking energy only during non-imaging periods. This approach maintains full laser power capability when needed while achieving cooling through temporal separation rather than power reduction.
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 reduces the duty cycle of laser exposure, preventing overheating and allowing the DMD to operate at higher power levels without damage, thereby extending its operational time and improving thermal management within the laser imaging system.
Implementation Method 1
The shutter-like device is configured with the capability to absorb the incident light, when necessary, and dissipate it to a location away from the temperature sensitive components of the laser imaging system
Implementation Method 2
dissipate it to a location away from the temperature sensitive components of the laser imaging system
Data Source
AI summary
A laser imaging system and method. In an example embodiment, one or more laser diode arrays are associated with a digital micro-mirror device. A shutter-like device can be positioned upstream in the light path of the laser diode array (or arrays) such that the shutter-like device diverts energy out of the laser imaging system and away from the digital micro-mirror device during periods of extended non-imaging. A homogenizer module can be provided wherein the shutter-like device is located.