Optical Reading Apparatus Visual Fatigue Reduction
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Solution Overview
Problem
Existing reading apparatuses for coded information cause visual fatigue due to inadequate design of illuminating, aiming, and reading outcome patterns, which fail to consider physiological features of the human eye, leading to poor perception and distinguishability of patterns, especially at varying distances.
Innovation Solution
The design of a reading apparatus with distinct chromatic differences between illuminating, aiming, and reading outcome patterns, utilizing non-coherent LED light sources with specific wavelength ranges (430-470 nm, 590-650 nm, and 530-560 nm) to maintain constant luminous intensity and resolution, ensuring clear perception over the entire work range, and optimizing the perception of these patterns using operating parameters like MTF and angular dimensions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional illuminating, aiming, and reading outcome patterns are used in reading apparatuses, then the apparatus can perform basic reading functions, but visual fatigue occurs due to inadequate design that fails to consider physiological features of the human eye
Solution Approach 1:
The patent applies parameter changes by selecting specific wavelength ranges for different LED light sources: blue LED (430-470 nm) for aiming patterns, yellow LED (590-650 nm) for illuminating patterns, and green LED (530-560 nm) for reading outcome patterns. These wavelength parameters are chosen to align with the spectral sensitivity characteristics of the human eye, thereby reducing visual fatigue while improving perception quality.
Solution Approach 2:
The patent applies local quality by assigning different chromatic characteristics to different functional patterns within the visual interface. Each pattern (aiming, illuminating, reading outcome) has a distinct color wavelength optimized for its specific function and for minimizing strain on particular regions of the human visual system, rather than using a uniform lighting approach.
2Ease of operation
If patterns are designed with distinct chromatic differences using specific wavelength ranges, then perception and distinguishability are enhanced, but device complexity increases due to multiple LED light sources with different characteristics
Solution Approach 1:
The patent manages device complexity by controlling the wavelength parameters of LED light sources within specific ranges (430-470 nm, 590-650 nm, 530-560 nm) rather than using arbitrary wavelengths. This parameter standardization allows for distinguishable patterns while maintaining compatibility with LED technology and simplifying the selection and integration of light sources.
Solution Approach 2:
The patent uses color changes as a functional differentiator among multiple light sources. By assigning distinct colors (blue, yellow, green) to different patterns, the system achieves high pattern distinguishability without requiring complex modulation schemes or additional optical components, thereby managing device complexity through straightforward chromatic differentiation.
3Object-affected harmful factors
If LED light sources with specific wavelengths are used to reduce visual fatigue, then the illuminating pattern perception is improved, but the luminous intensity may vary at different distances affecting consistent perception
Solution Approach 1:
The patent addresses perception consistency by selecting wavelength ranges for LED light sources that correspond to peaks in human spectral sensitivity (blue 430-470 nm, yellow 590-650 nm, green 530-560 nm). This parameter selection ensures that the luminous intensity remains relatively stable and perceptually consistent across varying distances, as these wavelengths experience minimal variation in perceived brightness with distance changes.
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 reduces visual fatigue and enhances the perception of the aiming and reading outcome patterns, ensuring clear visibility and differentiation over the significant work range, thereby improving the overall user experience without compromising aesthetic factors.
Implementation Method 1
utilizing non-coherent LED light sources with specific wavelength ranges (430-470 nm, 590-650 nm, and 530-560 nm)
Implementation Method 2
a light receive circuit comprising a photodetector for converting light reflected from an IBI into photodetector output signals representative of the IBI
Data Source
Figure 1~2
Figure 3~5
Figure 6~7
AI summary
A reading apparatus (5) for reading optical information (I) comprises a body (6) provided with a frontal face (7); optical information (I) acquisition means, which is arranged at a distance from the frontal face comprised between a minimum significant work distance, in particular 50mm, and a maximum work distance, in particular 350mm, defining a significant work range; illuminating means for emitting an illuminating pattern (2) such as to enable the optical information to be acquired; aiming means for emitting an aiming pattern (3) such as to indicate to a user a field of view of the apparatus; indicating means for emitting a reading apparatus outcome pattern (4) such as to supply indications to a user relating to the acquisition of the optical information (1). The illuminating means, the aiming means and the indicating means comprise respective non-coherent light sources. At least the illuminating means and/or the aiming means and/or the indicating means of the apparatus (5) are configurable by a plurality of operating parameters, for each of which respective permissible values are selectable that are able to influence the behaviour reading apparatus (5) with an effect that is detectable by said user during operation of the reading apparatus (5), The plurality of operating parameters comprises the wavelength of each of the light sources, the permissible values of the wavelength of the source of the aiming means are comprised in a range from 430 to 470 nm, the permissible values of the wavelength of the source of said illuminating means are comprised in a range from 590 to 650 nm; the permissible values of the wavelength of the source of the indicating means are comprised in a range from 530 to 560 nm. The permissible values of said wavelengths are such that the perception of the illuminating pattern (2), of the aiming pattern (3) and of the reading outcome pattern (4) is optimum to the human eye in consideration of the physiological properties thereof and this perception occurs with reduced visual fatigue to the user over the entire significant work range.