The lenses are clamped into spring rings or other types of holders that have a magnetizable part. The holder with the lens is mounted into bearing supports on the dome segment. The spring ring with the lens is flipped when it passes the magnetic field of an electromagnet during the slow rotation of the dome. By reversing the direction of the dome-rotation the spring ring with the lens can be turned back over.
Mechanical flip fixtures are often not used for ophthalmic lens coating because of several disadvantages such as lowering of machine capacity due to additional space required in the vacuum chamber and on the dome. Therefore, lenses have been turned manually for decades.

The innovative Magnetic Flip Fixture achieves the following improvements:

1. Increase of throughput rate by reducing process time while keeping the machine capacity high.

2. Reduction of labor time by eliminating manual work steps.

3. Save consumable by using them more efficiently.

The magnetic flip fixture can be adapted to various types of vacuum coating chambers without perforation of the chamber wall.


New coating possibilities
Automatic turn-over of lenses or any other objects offers new chances for coating application.

To save time and labour costs the anti-reflex layer stack is applied to one side first and then to the second side of the object. With the automatic turn-over it becomes efficient to double side coat the object layer by layer. Thereby, new coating features might become possible in the future.
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Click here to see the work flow chart


Click here to watch a computer animation