Optical Joystick Misalignment Compensation via Electrical Shifting
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Solution Overview
Problem
Optical joysticks face performance degradation due to misalignment of optical components, which existing correction methods are costly and inefficient, especially in high-volume production.
Innovation Solution
The optical joystick is designed with partitioned photodetectors and light-source elements that can be electrically shifted to compensate for misalignment, allowing for precise alignment without mechanical repositioning of components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If mechanical repositioning of optical components is used to correct misalignment, then alignment precision is improved, but manufacturing cost and production time increase
Solution Approach 1:
The patent replaces mechanical repositioning of optical components with an electrical control system. Individual photodetector elements or light-source elements are selectively activated or deactivated to achieve alignment compensation, eliminating the need for mechanical adjustment mechanisms and reducing production time while maintaining alignment precision.
Solution Approach 2:
The patent divides the photodetector array and light source into multiple independently controllable elements. This segmentation allows selective activation of specific elements to compensate for misalignment, enabling precise alignment adjustment without moving mechanical components, thus resolving the contradiction between precision and productivity.
2Manufacturing precision
If mechanical repositioning of optical components is used to correct misalignment, then alignment precision is improved, but fabrication cost increases
Solution Approach 1:
The patent replaces expensive mechanical repositioning mechanisms with a simpler electrical control system. By selectively activating individual photodetector elements or light-source elements through control circuitry, the system achieves alignment precision without requiring complex mechanical adjustment components, thereby reducing fabrication costs.
Solution Approach 2:
The patent changes the control parameter from mechanical position adjustment to electrical activation patterns. By varying which photodetector elements or light-source elements are active, the system achieves alignment compensation with simpler manufacturing processes, reducing fabrication costs while maintaining precision.
3Reliability
If all optical components are well-aligned during manufacturing, then device performance is improved, but manufacturing complexity and time increase
Solution Approach 1:
The patent performs alignment compensation in advance by pre-configuring the control circuitry to activate specific photodetector elements or light-source elements. This preliminary electrical configuration compensates for manufacturing variations without requiring complex mechanical alignment procedures during assembly, reducing manufacturing complexity while ensuring reliable device performance.
Solution Approach 2:
The patent replaces complex mechanical alignment procedures with simpler electrical control. Individual elements can be selectively activated to compensate for misalignment, reducing the complexity of the manufacturing process while maintaining high device performance through precise optical alignment.
4Manufacturing precision
If mechanical repositioning is used for alignment correction, then alignment precision is improved, but production time increases
Solution Approach 1:
The patent replaces time-consuming mechanical repositioning operations with rapid electrical control. By selectively activating individual photodetector elements or light-source elements through control circuitry, alignment precision is achieved instantly without mechanical movement, significantly reducing production time while maintaining high precision.
Solution Approach 2:
The patent segments the photodetector array and light source into multiple independently controllable elements. This segmentation enables rapid electrical switching to achieve alignment compensation, eliminating the need for slow mechanical adjustment processes and reducing production time while maintaining alignment precision.
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 approach simplifies and accelerates the alignment process, reducing fabrication costs and improving joystick performance by ensuring symmetric differential signals and optimal cursor control in handheld devices.
Implementation Method 1
A reflector 114 (that may be, for example, a mirror) is formed on the bottom side of the knob 116, directly facing the light source 106 such that light from the light source 106 is reflected by the reflector 114, towards photodetectors 108
Implementation Method 2
a plurality of photodetectors 108 (e.g., photodiodes)... light from the light source 106 is reflected by the reflector 114, towards photodetectors 108
Data Source
AI summary
An apparatus for misalignment compensation in optical joysticks is described. The optical joystick includes a light source, a plurality of photodetectors, and circuitry for controlling operation of the optical joystick. In some embodiments, each of the photodetectors may partitioned into a plurality of photodetector elements and select photodetector elements are configured to be individually activated in order to cause an electrical shifting of the selected photodetector elements to achieve a different operational alignment position of optical components of the optical joystick. In some embodiments, the light source may be similarly be calibrated by individually activating portions of a light-source array to cause an electrical shift. Various other embodiments and methods of operation are also described.