| 摘要 |
A writing instrument comprising a writing ink reservoir containing writing ink therein, a writing ink-passageway communicating with the writing ink reservoir, a writing tip communicating with the ink-passageway, and a check valve mechanism for preventing back-flow of writing ink, the check valve mechanism comprising a valve room provided at a portion of the writing ink-passageway, the valve room having a first area adjacent the writing tip, and a second narrow area adjacent the writing ink reservoir, valve ball movably received within the valve room, and an annular projection provided at the second area of the valve room, the annular projection inclined relative to an axial line of the writing ink-passageway, wherein when the valve ball is located at the second area of the valve room, the second area of the valve room is sealed by the valve ball, thereby preventing writing ink from flowing back toward the writing ink reservoir.
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