Projection Apparatus Illuminance Sensor Alignment Control
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Solution Overview
Problem
Projection apparatuses face issues with image quality and functionality due to changes in the positions of optical components, leading to abnormal light emission and potential failure when the light source is powered on without proper alignment.
Innovation Solution
A projection apparatus equipped with a time-sharing light emitting device, a display device, a projection optical system, an illuminance sensor, and a lighting determination unit that compares the illuminance output with threshold values to control the light emitting device's operation, ensuring proper alignment and preventing abnormal light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the projection apparatus is disassembled and reassembled or receives impact, then the positions and optical axes of optical components may change, but the light emission becomes abnormal and the system fails
Solution Approach 1:
The patent applies preliminary action by performing alignment detection before the light emitting device is activated. The illuminance sensor detects the position and optical axis alignment of optical components prior to light emission, allowing the system to verify proper assembly and prevent abnormal light emission that would occur if components were misaligned.
2Productivity
If the light emitting device operates without proper alignment detection, then the system can function continuously, but image quality deteriorates and abnormal light emission occurs
Solution Approach 1:
The patent implements feedback by using the illuminance sensor to detect alignment status and providing this information to the control unit. The control unit receives feedback about whether optical components are properly aligned and据此 controls whether the light emitting device should operate, ensuring image quality is maintained while allowing continuous operation when alignment is correct.
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
The solution effectively prevents image quality issues by ensuring the light emitting device only operates when the illuminance meets the required threshold, maintaining image clarity and preventing unnecessary power consumption.
Implementation Method 1
an illuminance sensor which converts illuminance of the color lights into an electric signal which is an output of the illuminance sensor
Data Source
AI summary
A projection apparatus includes a time-sharing light emitting device, a display device, a projection optical system, an illuminance sensor and a lighting determination unit. The time-sharing light emitting device successively emits color lights one by one. The display device modulates the color lights to form an image. The projection optical system projects the image. The illuminance sensor converts illuminance of the color lights into an electric signal which is an output of the illuminance sensor. The lighting determination unit compares the output with a first threshold value, and operates the time-sharing light emitting device in response to the output being more than the first threshold value, and stops the time-sharing light emitting device in response to the output being equal to or less than the first threshold value.