Magnetic Drive Unit Shielding with Half-Moon Members
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Solution Overview
Problem
Conventional radio wave controlled time pieces with magnetic drive units face challenges in maintaining high precision and receiving sensitivity due to external magnetic fields, as antimagnetic plates used to mitigate this issue reduce antenna structure sensitivity.
Innovation Solution
The design incorporates external magnetic members that selectively transmit or block magnetic flux, shielding the magnetic drive units while allowing improved antenna structure reception by using half-moon shaped magnetic members to cover parts of the time piece module, ensuring the magnetic drive units are protected from external magnetic fields without compromising antenna sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If antimagnetic plates are used to shield the magnetic drive unit from external magnetic fields, then the precision of the magnetic drive unit is improved, but the receiving sensitivity of the antenna structure is reduced
Solution Approach 1:
The antimagnetic plate is divided into multiple segments: a first antimagnetic plate with a first opening for the antenna structure, and a second antimagnetic plate with a second opening. This segmentation allows the antenna structure to pass through while still providing magnetic shielding for the magnetic drive unit, thus resolving the contradiction between shielding precision and antenna sensitivity.
Solution Approach 2:
The antimagnetic plates are configured with specific local properties: the first and second openings are positioned at locations corresponding to the antenna structure, allowing magnetic field penetration in those specific areas while maintaining shielding in other areas. This local differentiation enables both antenna sensitivity and magnetic drive unit precision to be maintained.
2Measurement precision
If the time piece module is covered with antimagnetic plates on both sides to prevent external magnetic field entry, then the operation accuracy of the motor is improved, but the antenna structure's receiving sensitivity is compromised
Solution Approach 1:
The antimagnetic shielding is segmented into multiple plates with openings rather than a continuous solid plate. The first and second antimagnetic plates are positioned on opposite sides of the time piece module, each with openings that align to allow radio wave passage while maintaining magnetic shielding in other areas.
Solution Approach 2:
The openings in the antimagnetic plates serve as intermediaries that allow the antenna structure to interact with external radio waves while the antimagnetic plates themselves mediate to block external magnetic fields from reaching the magnetic drive unit. This intermediary structure resolves the contradiction by providing selective permeability.
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 enhances the precision of the magnetic drive units and significantly improves the receiving sensitivity of the antenna structure, allowing accurate operation and enhanced radio wave reception.
Implementation Method 1
an antenna structure for receiving the standard radio wave including time information
Implementation Method 2
the motor is one kind of magnetic drive unit which is driven by magnetic force
Implementation Method 3
magnetic flux of the external magnetic field can enters into the accommodation space of the time piece case easily through the opening and its side opposing to the opening
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A radio wave receiving device includes at least one magnetic drive unit (M2) and an antenna structure (36) having a narrow magnetic core (36A) and a coil (36B) wound thereon. The device further includes two external magnetic members (50), each having a connecting part (50a) connected magnetically to one end part (36α) of the core. One magnetic member (50) has a magnetism collecting part (50b) expanded in one side of the structure from the connecting part to exclude the antenna structure, and the other magnetic member has a magnetism collecting part expanded in the other side of the structure from the connecting part to exclude the antenna structure. These magnetic members cover the drive unit in the both sides and shut off magnetic flux of external magnetic field from the both sides and collect magnetic flux of radio wave on the one end part of the core.