Illumination Device Segmentation for Ranging Frequency Characteristics
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Solution Overview
Problem
In illumination devices used for ranging, the series resonant circuit formed with light emission units and decoupling capacitors leads to deteriorated frequency characteristics, particularly in devices with multiple channels, affecting the responsiveness and accuracy of light modulation.
Innovation Solution
The illumination device includes a light emission element with multiple light emission units, a common electrode configuration, and switching units connected to a power supply, along with capacitors placed between the power supply and switching units to improve frequency characteristics by reducing the impact of series resonant circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a decoupling capacitor is connected as close as possible to a light emission unit, then charge can be supplied in short time and modulation responsiveness is improved, but a series resonant circuit is formed with off-side light emission units and the capacitor, causing frequency characteristics to deteriorate
Solution Approach 1:
The patent divides the light emission units into two separate groups (first light emission unit group and second light emission unit group) with separate decoupling capacitors (first decoupling capacitor and second decoupling capacitor). This segmentation prevents the formation of a series resonant circuit between off-side light emission units and capacitors, while still allowing each group to have its capacitor connected closely for fast charge supply and high modulation responsiveness.
2Loss of time
If decoupling capacitors are connected close to light emission units for high responsiveness, then charge supply time is reduced, but series resonant circuits form causing frequency characteristics to deteriorate
Solution Approach 1:
The patent segments the capacitor connections by providing separate decoupling capacitors for each light emission unit group. The first decoupling capacitor is connected to the first light emission unit group and the second decoupling capacitor is connected to the second light emission unit group. This segmentation eliminates the series resonant circuit path while maintaining short charge supply time for each group.
3Device complexity
If a series resonant circuit is formed with light emission units and decoupling capacitors, then compact circuit layout is achieved, but frequency characteristics deteriorate affecting ranging accuracy
Solution Approach 1:
The patent uses segmentation to separate the first light emission unit group with its decoupling capacitor from the second light emission unit group with its decoupling capacitor. This prevents the formation of a series resonant circuit that would otherwise form in a compact layout, thereby maintaining both compactness and frequency characteristics necessary for ranging accuracy.
Data Source
AI summary
For example, an influence of a series resonant circuit formed when a switching unit is turned off is reduced. An illumination device includes a light emission element including a first light emission unit group including a plurality of first light emission units and a second light emission unit group including a plurality of second light emission units, a first electrode of the first light emission unit group and a second electrode of the second light emission unit group made common, a first switching unit connected between a power supply and a third electrode of the first light emission unit group, a second switching unit connected between the power supply and a fourth electrode of the second light emission unit group, and at least one capacitor connected to a connection point between the power supply and the first switching unit and second switching unit.