Antenna Orientation and Spring Placement in Timepiece Modules
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Solution Overview
Problem
In wristwatches with metal and synthetic resin cases, the metal plate springs used for switching operations interfere with the magnetic field of the bar antenna, reducing its receiving sensitivity due to radio disturbance.
Innovation Solution
The antenna is obliquely arranged on the circuit board with one end directed towards the 3 o'clock or 9 o'clock and the other towards the 6 o'clock or 12 o'clock, and metal plate springs are positioned to avoid blocking the magnetic field, using a conductive displacement section that separates from the antenna to minimize radio disturbance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If metal plate springs are arranged on the outer periphery of the timepiece module for switching operations, then the switching function is achieved, but the receiving sensitivity of the bar antenna decreases due to magnetic field blocking
Solution Approach 1:
The patent extracts the harmful conductive displacement section from the timepiece module assembly by placing it on the rear cover rather than integrating it into the module housing. This separation removes the source of magnetic field interference from the antenna's operational area, allowing the antenna to function without blocking while maintaining the switching capability through the plate spring mechanism.
Solution Approach 2:
The patent introduces an electrically insulating material between the conductive displacement section and the module housing to prevent direct electrical contact and reduce electromagnetic interference. This intermediary layer acts as a barrier that allows mechanical switching function while minimizing the harmful electromagnetic interaction with the antenna.
2Reliability
If the inner case is made of synthetic resin to electrically insulate the outer case and rear cover, then the receiving sensitivity is improved, but the structural strength and shielding capability are reduced
Solution Approach 1:
The patent applies local quality by using synthetic resin specifically for the inner case where electrical insulation is most needed near the antenna, while other parts of the housing can use metal for strength and shielding. This localized material selection optimizes the balance between insulation requirements for antenna performance and structural requirements for overall device integrity.
Solution Approach 2:
The patent employs composite construction by combining synthetic resin inner case with metal outer case and rear cover. This composite approach allows each material to perform its optimal function - the resin provides insulation where needed while the metal components provide structural strength and electromagnetic shielding in areas where these properties are prioritized.
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 configuration prevents a decrease in antenna receiving sensitivity by reducing radio disturbance from the conductive displacement sections, allowing for improved antenna performance without interfering with the antenna's magnetic field.
Implementation Method 1
one end of which is directed toward a direction of 3 o'clock or 9 o'clock and the other end is directed toward a direction of 6 o'clock or 12 o'clock
Implementation Method 2
the plate spring blocks a magnetic field generated in the bar antenna
Data Source
AI summary
A module including a circuit board, a conductive displacement section which is arranged along an outer periphery of the circuit board and displaced in response to a switching operation, and an antenna which is arranged on the circuit board along the outer periphery of the circuit board with one end oriented toward a direction of 3 o'clock or 9 o'clock and the other end oriented toward a direction of 6 o'clock or 12 o'clock.