Mechanical Movement With Coaxial Planar Indicators for Ultra-Thin Timepieces
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Solution Overview
Problem
Existing mechanical timepiece display devices occupy significant volume due to stacked components, preventing their use in ultra-thin designs, and alternative solutions either lack traditional hand-fitting or suffer from complexity, inertia, or parallax issues.
Innovation Solution
A mechanical movement with indicator members pivoting about a pivot axis, housed entirely within a cavity, driven via outer peripheral toothing, eliminating the need for traditional drive wheels and using perforated mobiles to reduce thickness and avoid parallax.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If traditional hand-fitting display device is used, then traditional display appearance is achieved, but volume occupied by movement increases significantly
Solution Approach 1:
The patent changes the spatial arrangement from vertical stacking to a planar concentric configuration. The hour and minute hands are arranged concentrically with their pivots on the same axis, allowing both hands to coexist in the same radial plane without vertical stacking, thus reducing the movement's volume while maintaining traditional hand-fitting appearance.
Solution Approach 2:
The minute hand is nested within the radial space occupied by the hour hand. Both hands share the same pivot axis and radial plane, with the minute hand positioned inside the hour hand's path, allowing compact arrangement without increasing overall volume.
2Volume of moving object
If ultra-thin display solutions are used, then movement thickness is reduced, but traditional hand-fitting display is lost
Solution Approach 1:
The patent achieves ultra-thin profile by arranging hands in a planar concentric configuration rather than vertical stacking. This dimensional reorganization allows traditional hand-fitting appearance to be maintained while significantly reducing movement thickness, as both hands occupy the same radial plane.
3Object-affected harmful factors
If solid transparent disks are used for display, then parallax problem occurs, but energy consumption increases
Solution Approach 1:
The patent employs perforated mobile disks instead of solid transparent disks. The perforated structure eliminates parallax problems by removing the solid transparent material that causes optical distortion, while the openwork design reduces mass and consequently lowers energy consumption required to set the disks in motion.
Solution Approach 2:
The use of perforated mobiles eliminates the parallax effect associated with solid transparent disks. The perforated structure allows light to pass through without refraction or reflection that would cause parallax, while reducing the mass of the rotating elements and thereby decreasing energy consumption.
Data Source
AI summary
Disclosed is a mechanical movement including an information display device including at least one indicator member for the information, mounted pivoting about a pivot axis A. The movement encloses a cavity receiving at least the indicator member, the cavity being arranged so that the indicator member is housed entirely inside the movement. The movement includes at least one mobile arranged pivoting coaxially with the pivot axis A and including an outer peripheral toothing, the mobile being housed in the cavity and arranged to carry the indicator member. The mobile includes a felloe including the outer peripheral toothing and defining an inner opening, the felloe carrying an arm passing radially through the inner opening in order to be mounted pivoting on the pivot axis A, the indicator member being represented on the arm. Also disclosed is a timepiece including such a mechanical movement.