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1. A refillable ink cartridge containing ink that is supplied to a liquid discharge device that discharges a droplet of the ink, the refillable ink cartridge comprising:an ink supply opening portion that is hermetically sealed with an elastically deformable sealing member, wherein the sealing member is configured to be penetrated by a needle-shaped member in order to allow the refillable ink cartridge to be refilled with ink via the ink supply opening portion; anda protection member including a sealing portion configured to hermetically seal the ink supply opening portion outside the sealing member.
2. The refillable ink cartridge according to claim 1, wherein the sealing portion of the protection member includes a projecting portion formed on an inner side of the protection member, the projecting portion contacting an outer surface of the ink supply opening portion to hermetically seal the ink supply opening portion.
3. The refillable ink cartridge according to claim 1, wherein the sealing portion of the protection member includes a tight-contact portion that is tightly contacted with an outer surface of the sealing member of the ink supply opening portion.
4. The refillable ink cartridge according to claim 1, wherein the sealing portion of the protection member includes an adhesive portion that adheres to an outer surface of the sealing member of the ink supply opening portion.
5. The refillable ink cartridge according to claim 1, wherein the protection member includes a locking portion configured to be locked on the ink supply opening portion.
6. The refillable ink cartridge according to claim 1, wherein the protection member is fitted such that the sealing portion is compressed.
7. A protection member for sealing a refillable ink cartridge containing ink that is supplied to a liquid discharge device that discharges a droplet of the ink, the refillable ink cartridge comprising an ink supply opening portion that is hermetically sealed with an elastically deformable sealing member;wherein the sealing member is configured to be penetrated by a needle-shaped member in order to allow the refillable ink cartridge to be refilled with ink via the ink supply opening portion; andwherein the protection member includes a sealing portion configured to be disposed outside the sealing member of the ink supply opening portion to hermetically seal the ink supply opening portion.
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