Distance Measurement Device Optical Axis Variation Reduction
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Solution Overview
Problem
Distance measurement devices face challenges in maintaining accurate irradiation positions of directional light due to variations in the optical axis, leading to reduced shake reduction accuracy and shifted laser light positions, especially when hand shake or vehicle vibrations occur.
Innovation Solution
A distance measurement device with a common optical path for both image formation and directional light, featuring a common reduction unit and auxiliary reduction units, including anti-shake lenses and lens variation mechanisms, to minimize the impact of optical axis variations on the irradiation position, ensuring precise alignment and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If an image shake reduction mechanism is applied to reduce image shake, then the subject image stability is improved, but the laser light irradiation position shifts from the intended center position
Solution Approach 1:
The patent divides the shake reduction function into two independent units: an image shake reduction unit that stabilizes the subject image, and a laser shake reduction unit that stabilizes the laser light irradiation position. Each unit operates independently with its own control mechanism, allowing simultaneous optimization of both image stability and irradiation accuracy without the trade-off present in unified systems.
2Device complexity
If a common optical path structure is used to reduce device complexity, then the structure becomes more compact, but the shake reduction accuracy decreases due to structural differences between image and laser paths
Solution Approach 1:
The patent separates the optical paths into distinct image and laser channels, each with dedicated shake reduction mechanisms. This segmentation allows each path to be optimized for its specific function while maintaining overall system compactness through integrated control, resolving the contradiction between structural simplicity and functional accuracy.
Solution Approach 2:
The patent applies different shake reduction strategies tailored to the specific requirements of each optical path. The image shake reduction unit is optimized for visual stability, while the laser shake reduction unit is optimized for precise irradiation positioning, allowing each component to have the local quality needed for its specific function.
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 reduces shifting of the irradiation position within a small structure, maintaining accuracy and stability even under vibrations, by synchronizing the operation of common and auxiliary reduction units, thereby enhancing the overall shake reduction accuracy.
Implementation Method 1
influence of variation of an optical axis of an image formation optical system on a subject image
Implementation Method 2
lens variation mechanism varying the anti-shake lens
Data Source
AI summary
A distance measurement device includes a detection unit, an optical path forming unit, a common reduction unit that reduces influence of variation of an optical axis of an image formation optical system, and reduces variation of an optical axis of the directional light, an auxiliary reduction unit that auxiliarily reduces at least one of influence of variation of the optical axis of the image formation optical system or variation of the optical axis of the directional light, and a control unit that, in a case of operating the common reduction unit and the auxiliary reduction unit at the same time, controls the common reduction unit and the auxiliary reduction unit to reduce variation of an irradiation position of the directional light in a subject image received as light by a light receiving section.