Distance Measuring Apparatus Using Wavelength Dispersion for Macro Focus
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Solution Overview
Problem
Existing distance measuring modules in electronic devices, particularly during macrophotography, often experience significant errors in detecting the actual distance to an object, leading to poor focusing and unclear images due to the discrepancy between detected and actual distances.
Innovation Solution
A distance measuring apparatus that includes a light source emitting detection light within a set wavelength range, a beam splitter, a lens group with dispersing lenses to focus different wavelengths to various positions, and a spectral sensor to determine the distance based on light intensity, allowing for accurate distance measurement and improved focusing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional distance measuring module is used, then the device structure is simple, but the measurement precision is poor at short ranges
Solution Approach 1:
The patent segments the distance measurement function into multiple independent modules: a light source module emitting detection light, a beam splitter module directing light paths, a lens group module focusing light at different wavelengths to different positions, and a spectral sensor module detecting reflected light. This segmentation allows each module to be optimized independently, achieving high measurement precision while maintaining manageable structural complexity through modular design.
Solution Approach 2:
The patent introduces a beam splitter as an intermediary component that separates the detection light path from the reflected light path. The beam splitter allows detection light to pass through to the lens group while simultaneously reflecting the light returned from the object back through the beam splitter to the spectral sensor. This intermediary mechanism enables precise distance measurement by mediating between the light source and sensor, resolving the contradiction between simplicity and precision.
2Manufacturing precision
If conventional distance measurement is used, then the device is easy to manufacture, but the focusing accuracy is poor
Solution Approach 1:
The patent employs a lens group that focuses light at different wavelengths to different positions along the optical axis. By changing the wavelength parameter of the detection light, the system can selectively focus at different distances. The spectral sensor detects which wavelength corresponds to the maximum light intensity, thereby determining the accurate focusing position. This parameter-based approach enables high manufacturing precision for focusing while maintaining ease of manufacture through standard optical components.
3Reliability
If simple distance measurement is used, then the device complexity is low, but the image clarity is poor
Solution Approach 1:
The patent implements a feedback mechanism where the spectral sensor detects the intensity of reflected light at different wavelengths and feeds this information back to determine the accurate distance. The system uses this feedback to identify the wavelength corresponding to maximum light intensity, which indicates the correct focusing position. This feedback loop ensures high image clarity by continuously optimizing the focus based on actual light return, while the modular design keeps device complexity manageable.
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 apparatus provides highly accurate distance measurements, even at short ranges, leading to improved focusing accuracy and image clarity during macrophotography by determining the optimal focusing position based on light intensity and wavelength correspondence.
Implementation Method 1
a beam splitter configured to allow the detection light to pass through and to output a transmitted light corresponding to the detection light
Implementation Method 2
the detection light enters a first surface of the beam splitter
Implementation Method 3
A lens group comprising at least one dispersing lens is configured to disperse the transmitted light, which is transmitted from the beam splitter to the lens group, to focus lights of different wavelengths to various focusing positions
Implementation Method 4
focus lights of different wavelengths to various focusing positions
Implementation Method 5
A spectral sensor is configured to output first information in response to the first reflected light being received, wherein the first information at least represents a light intensity corresponding to a wavelength of the first reflected light
Data Source
AI summary
The distance measuring apparatus includes a light source, a beam splitter, a lens group comprising at least one dispersion lens, a first light limiter and a spectrum sensor. The light source is configured to emit detection light. The beam splitter is configured to transmit the detection light. The lens group is configured to disperse the transmission light to the lens group to focus the light of different wavelengths to different positions. The first light limiter is provided with a light passing area. The first reflected light represents reflected light generated on a second surface when second reflected light is transmitted from the lens group to the second surface of the beam splitter, and the second reflected light represents reflected light generated on the surface of a measured object by light focused on the surface of the measured object.