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