Telephone Handset On-Hook Detection Using Optical Reflection
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Solution Overview
Problem
Conventional telephone devices face accuracy issues in determining the on-hook status due to dust accumulation and mechanical fatigue in link mechanisms, and existing infrared-based solutions are prone to errors from optical path misalignment and emitting angle deviations.
Innovation Solution
A telephone device with a light detection system using an infrared light emitting diode, infrared lens, and a rubber light concentrating element to accurately determine the on-hook status without complex mechanical designs, ensuring precise detection and maintaining an aesthetic appearance by eliminating the need for a link mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a link mechanism with conductive component is used to detect on-hook status, then the telephone device can detect handset status through mechanical contact, but the link mechanism accumulates dust and the spring fatigues causing stuck conditions that affect detection accuracy
Solution Approach 1:
The patent replaces the mechanical link mechanism with an optical detection system consisting of a light source, light receiver, and optical path. The light receiver detects changes in light intensity caused by the handset position, eliminating mechanical contact and thus preventing dust accumulation and spring fatigue while maintaining reliable status detection.
2Reliability
If multiple reflecting sets are used in infrared detection to determine handset status, then the system can detect on-hook status without mechanical contact, but the optical path becomes complex and prone to errors from misalignment or emitting angle deviations
Solution Approach 1:
The patent extracts and eliminates the complex multiple reflecting sets from the optical path, retaining only the essential components: a light source, a light receiver, and a direct optical path. This simplification maintains contactless detection capability while removing the source of alignment errors and optical path complexity.
3Ease of manufacture
If a link mechanism is used for status detection, then the structure is functional but it affects the aesthetic appearance of the telephone device
Solution Approach 1:
The patent replaces the visible mechanical link mechanism with a concealed optical system. The optical components are integrated into the base housing, allowing the exterior surface to remain smooth and uninterrupted, thus maintaining aesthetic appearance while preserving the functional capability of status detection.
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 light detection system provides accurate on-hook status determination without complex mechanisms or optical path errors, enhancing reliability and maintaining a clean, aesthetically pleasing design.
Implementation Method 1
A light transmitter installed in the housing of the base for emitting light
Implementation Method 2
a light receiver installed in the housing of the base for receiving the light reflected from the end of the handset
Implementation Method 3
a light concentrating element installed in the housing of the base and surrounding the light transmitter... used for concentrating the light emitted from the light transmitter to the light penetrating element
Implementation Method 4
An end of the handset reflects the light emitted from the light transmitter and penetrating through the light penetrating element back to the light penetrating element
Data Source
AI summary
A telephone device includes a base, a light transmitter, a light penetrating element for penetrating light transmitter from the light transmitter, and a handset. When an end of the handset is on-hook with the base, the end of the handset reflects the light emitted from the light transmitter and penetrating through the light penetrating element back to the light penetrating element. The telephone device further includes a light receiver for receiving the light reflected from the handset when the end of the handset is on-hook with the base, a light concentrating element for concentrating the light emitted from the light transmitter to the light penetrating element, and a control unit for determining whether the end of the handset is on-hook with the base according to whether the light receiver receives the light reflected from the handset.