Horology: time measuring systems or devices – Chronological – With simultaneous time indicating means
Patent
1981-12-11
1983-11-08
Miska, Vit W.
Horology: time measuring systems or devices
Chronological
With simultaneous time indicating means
368 84, 368242, 350334, G04B 2500, G04C 1900
Patent
active
044139152
ABSTRACT:
A watch which comprises movable analog display members, a dial and a digital display cell surrounded by said dial. The watch is further provided with means that can be controlled by the user of the watch, for making the digital display device visible or invisible, as desired.
The digital display cell is of the twist nematic type.
A liquid crystal layer 60a is positioned between two polarizers 60b and 60c. Polarizer 60c can be rotated about an axis 12 perpendicular to its plane by actuating means 13a, 14, 15, 17 which is accessible from the outside of the casing of the watch. The cell can be made substantially invisible by rotating the movable polarizer 60b in order to position its polarizing plane either parallel or perpendicular to the polarizing plane of the other polarizer 60c, depending on whether the color of the dial around the cell is dark or light respectively. Other optical arrangements are disclosed for causing the display device to take selectively the color of the dial and a second color different from the dial's color.
REFERENCES:
patent: 4250572 (1981-02-01), Yoshida
patent: 4312056 (1982-01-01), Mishimura
patent: 4355380 (1982-10-01), Huguenin et al.
ETA S.A. Fabriques d'Ebauches ETA 13
Miska Vit W.
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