Patent ID: 7104658

Claim:
A cup for an eyepiece of an optical observation instrument, comprising a) a peripheral wall ( 3 ) which includes i) an eyepiece-connecting section ( 4 ) for connection of the cup to an eyepiece ( 2 ), ii) a transition section ( 5 ) which adjoins the eyepiece-connecting section ( 4 ), iii) a light-protecting attachment ( 6 ) which, by way of a sectional part of the transition section ( 5 ), is joined to a side of the transition section ( 5 ) that is turned away from the eyepiece-connecting section ( 4 ); b) a sight hole ( 19 ) which is laterally defined by the peripheral wall ( 3 ); c) the peripheral wall ( 3 ) being movable i) into a first non-folded end position for someone who does not wear spectacles for preclusion of any incidence of stray light upon an eyepiece lens, ii) into a second folded end position for spectacle wearers, and iii) into a third stable position of ventilation, located between the first and the second end positions, for someone not wearing spectacles for preclusion of any fogging of the eyepiece lens, wherein, for the third stable position of ventilation, the light-protecting attachment ( 6 ) comprises a reinforcing bead ( 14 ) which assists in producing a fold-down edge ( 15 ) of controlled extension and predetermined size, the reinforcing bead ( 14 ) pre-determining an accurate march of the fold-down edge ( 15 ), wherein due to the reinforcing bead ( 14 ) the march of the fold-down edge ( 15 ) is not affected by any minor forces.