Projector Ranging Alignment with an Inclined Sensor Substrate
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Solution Overview
Problem
Existing projectors face issues with detection accuracy due to the deviation between the projection range of image light and the detection range of detection light, as the infrared light emitting and receiving units are often positioned away from the optical axis, leading to reduced ranging accuracy.
Innovation Solution
The projector design includes a projection optical device with a front lens that projects image light off-axis, and a ranging device with a substrate and sensor disposed at an angle to align the detection light with the image light projection range, using a substrate inclined relative to the lens optical axis to improve alignment and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the infrared light emitting unit and the infrared light receiving unit are disposed at positions away from the optical axis of the projection optical device, then it becomes easier to dispose the components, but a deviation occurs between the projection range of the image light and the detection range of the detection light, lowering the detection accuracy and ranging accuracy
Solution Approach 1:
The substrate is disposed to be inclined at a specific angle (e.g., 5-15 degrees) with respect to the virtual plane orthogonal to the lens optical axis. This asymmetric angular disposition of the substrate, upon which the light emitting element and light receiving element are mounted, enables the detection light to be directed along the projection direction of the image light, thereby aligning the detection range with the projection range and improving detection accuracy while maintaining ease of component disposal
2Ease of manufacture
If the infrared light emitting unit and the infrared light receiving unit are disposed at positions away from the optical axis of the projection optical device, then it becomes easier to dispose the components, but the ranging accuracy is lowered
Solution Approach 1:
The substrate is disposed to be inclined at a specific angle (e.g., 5-15 degrees) with respect to the virtual plane orthogonal to the lens optical axis. This asymmetric angular disposition of the substrate, upon which the light emitting element and light receiving element are mounted, enables the detection light to be directed along the projection direction of the image light, thereby aligning the detection range with the projection range and improving ranging accuracy while maintaining ease of component disposal
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 configuration enhances detection accuracy by ensuring the detection light's irradiation and reception ranges coincide with the image light projection, thereby improving the overall ranging precision.
Implementation Method 1
a sensor which includes a light emitting element configured to emit the detection light and a light receiving element configured to receive the detection light emitted from the light emitting element
Implementation Method 2
a cover having a light transmissive property, and disposed corresponding to the passage port
Data Source
AI summary
A projector includes an exterior housing having a projection port and a passage port, a projection optical device, a cover, and a ranging device configured to emit and receive detection light, in which the projection optical device includes a front lens, and projects a image light such that a projection range of the image light moves toward one side in a second direction as moving in a first direction when a direction along a lens optical axis of the front lens is defined as the first direction and a direction orthogonal to the first direction is defined as the second direction, the ranging device includes a substrate and a sensor, and the substrate is disposed to be inclined with respect to a virtual plane so that a detection light of the sensor points at a projection range of the image light by the projection optical device.