EP0814388B1 - Glace de montre - Google Patents
Glace de montre Download PDFInfo
- Publication number
- EP0814388B1 EP0814388B1 EP19970108556 EP97108556A EP0814388B1 EP 0814388 B1 EP0814388 B1 EP 0814388B1 EP 19970108556 EP19970108556 EP 19970108556 EP 97108556 A EP97108556 A EP 97108556A EP 0814388 B1 EP0814388 B1 EP 0814388B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- lens
- plate
- housing
- recess
- ice
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- G—PHYSICS
- G04—HOROLOGY
- G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
- G04B39/00—Watch crystals; Fastening or sealing of crystals; Clock glasses
- G04B39/008—Watch crystals; Fastening or sealing of crystals; Clock glasses with means for magnified reading
Definitions
- the present invention relates to a watch crystal comprising on one of its main faces a converging lens magnifying glass, or magnifying glass, arranged to facilitate reading, for example, the date or the day in a watch with a calendar.
- Such ice creams are known.
- the material used is transparent plastic, glass and lens are obtained at the same time by injection, the lens found on one side of the ice, or drowned in its thickness.
- this material has the disadvantage of having little abrasion resistance
- generally used glass in watchmaking are in mineral glass, or in corundum for the pieces of luxury.
- the ice is then composed of a thin plate, and a lens glued to the face of the plate which delimits the outer contour of the watch, so as not to hinder the movement of the hands.
- This kind of ice however has the disadvantage of increasing the thickness of the watch, and to expose the lens to shocks which could damage it or take it off.
- the purpose of the present invention is to provide a watch crystal made of mineral glass or corundum without these drawbacks.
- the glass according to the invention comprises a plate transparent made of an optically transparent hard material, colorless or colored, bounded by two main faces and a lens magnifying. It is characterized in that the plate has a blind housing accessible from one of its faces, and in that the lens, which forms a separate part of the plate, is arranged in this accommodation.
- An advantage of the ice according to the invention is its production cost low, housing and lens can be machined using simple conventional machines, intended for manufacturing in large series.
- the shape of the housing and the lens may be other than circular, and be chosen so as to improve the reading of an inscription, or to give the ice a special stamp.
- Patent CH 608 326 describes an ice having a recess in which houses a filter.
- it is proposed to associate a ice lens, the introduction of the lens into the recess being, however, explicitly excluded.
- FIG. 1a An embodiment of the watch glass according to the invention, referenced 1, is shown in a view plan and from above in fig. 1a.
- Reference 2 designates on this figure a thin transparent plate, preferably glass, spinel or corundum, circular in shape and about 2 millimeters thick. Plate 2 is delimited by two substantially flat main faces, one upper 3, and the other lower 4 intended to come in look at the dial of a watch not shown. The faces main are visible on views 1b, c and d.
- Fig. 1b is a sectional view along an axis BB 'passing through the center ice and a first lens
- fig. 1c is a view in section along an axis CC 'parallel to BB' and passing through a second lens
- fig. 1d is a sectional view along an axis DD 'perpendicular to BB' and passing through the center of ice and the second lens.
- the plate 2 has a blind housing 5, in the form of cylinder of revolution whose axis is perpendicular to sides 3 and 4, and which is located at the edge of the plate, on the axis BB '.
- the bottom 6 of the housing is flat and parallel to the face main upper 3, from which it is separated by a material thickness 7 of a few tenths of a millimeter.
- Housing 5 is obtained by grinding from the main face 4 of plate 2 by means of an end wheel arranged in a conventional grinding machine. Then a running-in allows to make the bottom and the side face of the housing transparent giving them an optical polish. It is also possible to use, instead of a grinding machine, a conventional ultrasound and a cylindrical tool and then to obtain the desired polish by brushing known per se. Ultrasonic machining has the advantage of greater freedom in choosing the outline of the opening, it suffices that the tool has a contour of complementary shape.
- machining processes of opening 5 will not be not described because they are known and widely used in industry. No more than the machines for these processes, because they are well known machines and also used for a long time in industry, in especially for machining and polishing in large series of hard material parts.
- a magnifying lens 10 shown in plan and in profile respectively on the Fig. 2a and 2b.
- the lens comprises a cylindrical base 11, of the same diameter as the housing 5, and a spherical cap 12 surmounting the base and having the function of a magnifying glass.
- the base 11 comes into contact with the bottom 6 of the housing, and so that the cap 12 does not protrude from face 4, the total height of the lens is equal to the depth of the housing.
- the lens is held in the housing for example by means epoxy glue.
- the lens 10 is made in one piece by known machining processes using the same material as the plate 2, or any other hard material and optically transparent. So if the plate 2 is made of pure corundum, so colorless, the lens 10 may advantageously be made of sapphire or in rubies, which are corundums containing impurities, in order to distinguish the ice thus obtained from ice with conventional lens. But the plate could just as easily well being in sapphire, and the lens in corundum for example.
- the plate 2 comprises a housing 15 having the shape of a parallelepiped rectangle, shown in plan in fig. the and in section on fig. 1c and 1d. Since the faces of such a housing are planes intersecting at right angles, this housing cannot be obtained only by the ultrasonic machining process.
- a lens 16 shown in plan and in profile respectively in FIGS. 2c and 2d. It has the shape of a parallelepiped 17, similarly section as the housing 15, one of the main faces of which is constituted by a cylindrical cap 18. Such a lens can be obtained by the same machining processes as the lens 10.
- the ice could have a form other than round, and the main faces could have a some curvature. Any hard material and optically transparent, colorless or colored, may be suitable for make the plate or the lens. Different materials could be used for plate and lens.
- the contours of the housing and the lens while being could deviate from the geometric shapes simple if the machining is carried out by ultrasound, and reproduce for example the outline of a brand symbol.
- the housing and the lens could be on the side of the upper main face of the ice, the depth of the housing then being chosen so that the spherical cap of the lens comes out of the face so that the connection between the lens and the plate has no recesses.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Lenses (AREA)
- Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
Description
- les fig. 1 représentent, dans des vues en plan et en coupe, un exemple de glace de montre selon l'invention comportant, à titre d'exemples, deux lentilles de formes différentes; et
- les fig. 2 montrent, dans des vues en plan et de profil agrandies, les deux lentilles représentées sur les figures précédentes.
Claims (6)
- Glace de montre comportant une plaque (2) transparente réalisée en un matériau dur optiquement transparent, incolore ou coloré, délimitée par deux faces principales (3, 4) et une lentille grossissante (10;26), caractérisée en ce que ladite plaque (2) comporte un logement borgne (5; 15) accessible depuis l'une desdites faces (3, 4), et en ce que ladite lentille grossissante (10; 16), qui forme une pièce distincte de la plaque (2), est disposée dans ledit logement (5; 15).
- Glace selon revendication 1, caractérisée en ce que la profondeur dudit logement (5; 15) est sensiblement égale à la hauteur de ladite lentille (10; 16).
- Glace selon l'une des revendications 1 ou 2, caractérisée en ce que ledit logement (5; 15) débouche à l'extérieur par la face principale (4) de ladite plaque (2) se trouvent en regard du cadran de la montre.
- Glace selon rune des revendications précédentes, caractérisée en ce que ladite lentille (10, 16) et ladite plaque (2) sont fabriquées en un même matériau optiquement transparent, incolore ou coloré.
- Glace selon la revendication 4, caractérisée en ce que ledit matériau est du corindon.
- Glace selon l'une des revendications précédentes, caractérisée en ce que ledit logement (5, 15) et ladite lentille (10, 16) présentent une forme non ronde.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH152996 | 1996-06-19 | ||
CH1529/96 | 1996-06-19 | ||
CH01529/96A CH690521A5 (fr) | 1996-06-19 | 1996-06-19 | Glace de montre. |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0814388A1 EP0814388A1 (fr) | 1997-12-29 |
EP0814388B1 true EP0814388B1 (fr) | 2002-09-04 |
Family
ID=4212582
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19970108556 Expired - Lifetime EP0814388B1 (fr) | 1996-06-19 | 1997-05-28 | Glace de montre |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0814388B1 (fr) |
CH (1) | CH690521A5 (fr) |
DE (1) | DE69715105T2 (fr) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0947895B1 (fr) * | 1998-04-02 | 2004-11-24 | Comadur S.A. | Glace de montre comprenant une lentille et procédé de fabrication d'une telle lentille |
EP1647867A1 (fr) | 2004-10-11 | 2006-04-19 | The Swatch Group Management Services AG | Dispositif de grossissement pour pièce d'horlogerie |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH15293A (de) * | 1897-09-21 | 1898-04-30 | Allg Stein Schleif Patent Ges | Maschine zur Herstellung von Steinmetzarbeiten durch Schleifen |
CH306108A (fr) * | 1954-10-27 | 1955-03-31 | Ernest Borel & Cie S A | Montre. |
CH649436GA3 (fr) * | 1982-06-10 | 1985-05-31 |
-
1996
- 1996-06-19 CH CH01529/96A patent/CH690521A5/fr not_active IP Right Cessation
-
1997
- 1997-05-28 DE DE1997615105 patent/DE69715105T2/de not_active Expired - Lifetime
- 1997-05-28 EP EP19970108556 patent/EP0814388B1/fr not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
DE69715105T2 (de) | 2003-03-13 |
DE69715105D1 (de) | 2002-10-10 |
CH690521A5 (fr) | 2000-09-29 |
EP0814388A1 (fr) | 1997-12-29 |
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