Dewar device for watch
A Dewar device ( 1 ) for mechanical and/or functional components 5 of a watch ( 10 ), comprising a casing ( 2 ) provided with an enclosure ( 4 ) wherein a case ( 12 ) of said watch ( 10 ) can be removably arranged, said case being provided with a display device capable of displaying information relating to time indications or to functions implemented by the watch ( 10 ), said display device being arranged opposite a crystal ( 6 ) of said casing ( 2 ), the Dewar device ( 1 ) comprising a system ( 3 ) for dynamically adjusting the contrast of the display device of the watch ( 10 ) comprising said variable luminosity crystal ( 6 ) and a control unit ( 8 ) configured to control the contrast of said display device of the watch ( 10 ).
1 . A Dewar device ( 1 ) for mechanical and/or functional components ( 5 ) of a watch ( 10 ), comprising:
a casing ( 2 ) provided with an enclosure ( 4 ) wherein a case ( 12 ) of said watch ( 10 ) can be removably arranged, said case being provided with a display device capable of displaying information relating to time indications or to functions implemented by the watch ( 10 ), said display device being disposed opposite a variable luminosity crystal ( 6 ) of said casing ( 2 ); and
a system ( 3 ) for dynamically adjusting the contrast of the display device of the watch ( 10 ), the system ( 3 ) comprising said variable luminosity crystal ( 6 ) and a control unit ( 8 ) configured to control the contrast of said display device of the watch ( 10 ).
2 . The device ( 1 ) according to claim 1 , wherein said crystal ( 6 ) comprises a luminosity variation element ( 7 ) which is transparent.
3 . The device ( 1 ) according to claim 2 , wherein the control unit ( 8 ) is connected via a connecting element ( 14 ) to the luminosity variation element ( 7 ) for varying the luminosity of the crystal ( 6 ).
4 . The device ( 1 ) according to claim 1 , wherein the crystal ( 6 ) comprises a transparent substrate, a lower surface of which includes a luminosity variation element ( 7 ).
5 . The device ( 1 ) according to claim 1 , wherein the crystal ( 6 ) comprises a transparent substrate including a luminosity variation element ( 7 ) which is provided in a body of said substrate.
6 . The device ( 1 ) according to claim 5 , wherein the substrate is formed by two layers of transparent material, and wherein the luminosity variation element ( 7 ) is disposed between the two layers of transparent material, the luminosity variation element including a stack of transparent functional layers of organic electroluminescent materials.
7 . The device ( 1 ) according to claim 1 , wherein the control unit ( 8 ) comprises at least one event sensor for sensing a variation in luminosity in an outer environment of said Dewar device ( 1 ).
8 . The device ( 1 ) according to claim 1 , wherein the crystal ( 6 ) comprises a luminosity variation element ( 7 ) which is transparent, the luminosity variation element ( 7 ) of the crystal ( 6 ) being a lighting element, including a transparent lighting element of the OLED type.
9 . The device ( 1 ) according to claim 1 , wherein said watch case ( 12 ) is fixed in said enclosure ( 4 ) in such a way as to maintain the watch case away from functional elements ( 15 ) forming the enclosure ( 4 ), the enclosure comprising a middle part ( 9 a ), a back ( 9 b ) and a variable luminosity crystal ( 6 ) of this casing ( 2 ).
10 . The device ( 1 ) according to claim 1 , wherein said enclosure ( 4 ) is under vacuum or near-vacuum.
11 . The device ( 1 ) according to claim 1 , wherein the crystal ( 6 ) has a surface that is substantially greater than or strictly greater than that of a crystal ( 11 ) of the watch case ( 10 ).