Battery Holder Gap Design for Thin Timepiece Cases
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Solution Overview
Problem
Conventional battery holding devices in timepieces require thick resin-based battery cases to withstand impacts, limiting the reduction in device thickness and size due to the need for a thick bottom plate to support the battery.
Innovation Solution
A battery holding device with a terminal plate that includes fasteners fixed to the main plate and a battery holder positioned not to contact the plate, allowing for a thinner battery compartment design by creating a gap between the battery and the main plate, thus preventing direct impact transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a thick resin bottom plate is used to support the battery and withstand impacts, then the battery is securely held and impact resistance is improved, but the battery case thickness and overall device size increase
Solution Approach 1:
The battery holding function is segmented from the main plate structure. A separate battery holder member is introduced to hold the battery, while the main plate provides overall structural support. This segmentation allows the main plate to be thinner since it doesn't need to directly support the battery weight and absorb all impact forces alone.
Solution Approach 2:
The invention uses a composite structure combining a resin main plate with a metal battery holder member. The metal battery holder provides high strength and impact resistance with thin walls, while the resin main plate provides overall housing. This composite approach achieves better impact resistance than a thick resin plate alone while maintaining thinner overall dimensions.
2Stability of the object's composition
If a thick resin bottom plate is used to support the battery, then structural stability is improved, but the device size and weight increase
Solution Approach 1:
The battery support function is separated from the main housing structure. The battery holder member is a distinct component that provides localized support exactly where needed, while the main plate can be optimized for overall housing without excessive thickness. This segmentation achieves structural stability with reduced material usage and smaller device volume.
Solution Approach 2:
Instead of making the entire main plate thick for battery support, the invention concentrates the support function in a localized battery holder member. This localized approach provides necessary structural stability at the battery location while allowing the rest of the housing to remain thin, reducing overall device volume and weight.
3Reliability
If a thick resin bottom plate is used to house the battery, then battery support capability is improved, but the number of components and assembly complexity increase
Solution Approach 1:
The battery holder member integrates multiple functions: it holds the battery, provides electrical terminal connections, and serves as a mounting structure for the circuit board. By merging these functions into a single integrated component, the design achieves reliable battery support without proportionally increasing component count or assembly complexity.
Solution Approach 2:
The battery holder member is designed as a multi-functional component that simultaneously performs battery retention, electrical connection, and structural support functions. This multi-functionality reduces the need for separate dedicated components for each function, thereby maintaining reliability while controlling overall device complexity.
Data Source
AI summary
A battery holding device includes a battery holding member and a plate. The plate houses the battery holding member. The battery holding member includes a fastener and a battery holder. The fastener is fixed to the plate. The battery holder holds a battery, and is arranged at a position where the battery holder does not contact the plate.