PRESSURE DIFFERENCE COMPENSATION MEMBRANE

摘要

The invention relates to a membrane (20) for compensating pressure difference between the outside and the inside of a free ink reservoir of a pen or the like, comprising a first part (22) exhibiting a first rigidity, and a second part (24) exhibiting a second rigidity, the first rigidity being lower than the second rigidity. The invention also relates to a pen or the like comprising a free ink reservoir provided with such a compensation membrane (20).