Abstract: A reservoir type writing pen having a micro-porous straight-liquid structure comprises a writing pen core (9); wherein the micro-porous straight-liquid structure includes an air pressure balance plug (3), a liquid storage pipe (11) configured for storing liquid ink, and a liquid guiding device configured for leading the liquid ink in the liquid storage pipe (11) into the writing pen core (9). The present application adopts the gap between the relaying pen core and the writing pen core, the ventilating core and the nano breathing plate to realize keeping the inner air pressure of the liquid storage space and the outside atmosphere pressure consistent. The writing pen of the present application has a simple structure, and the producing processes of the ventilating core have been matured, which can reduce the producing cost greatly.

Abstract: A writing pen with ink storage, including a writing nib, an ink storage compartment for storing ink, an ink inducing device for inducing ink into the writing nib, wherein the writing pen further includes an air pressure balancing plug which is plugged in an open end of the ink storage compartment to seal ink, and a breathable core having nanopores, the breathable core being inserted into the air pressure balancing plug with one end extending into ink and the other end communicating with ambient air. The writing pen with ink storage has simple structure, provides fluent writing and no ink leakage.