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1. An ink cartridge mountable on a cartridge mounting section of an inkjet recording system through insertion of the ink cartridge in a prescribed mounting direction, the inkjet recording system including an optical detecting unit, the ink cartridge comprising:a cartridge main body that has an ink accommodating chamber accommodating ink therein;an ink-outputting section that outputs the ink in the ink accommodating chamber; andat least two first light-shielding parts that are juxtaposed in the prescribed mounting direction at a prescribed interval and that are incapable of moving relative to the cartridge main body, the at least two first light-shielding parts being used in conjunction with the optical detecting unit for detecting mounting and dismounting of the ink cartridge,wherein lengths in the prescribed mounting direction of the at least two first light-shielding parts are different from one another.
2. The ink cartridge according to claim 1, further comprising a second light-shielding part that is used in conjunction with the optical detecting unit for detecting an amount of ink accommodated in the ink accommodating chamber,wherein the second light-shielding part is capable of moving toward a position adjacent to the at least two first light-shielding parts in the prescribed mounting direction.
3. The ink cartridge according to claim 2, further comprising a float part that is connected to the second light-shielding part, that has a specific gravity lower than a specific gravity of the ink in the ink accommodating chamber, and that moves to follow the fluctuations of an ink level accommodated in the ink accommodating chamber,wherein the motion of the float part by the fluctuations of the ink level prompts the second light-shielding part to move to the position adjacent to the at least two first light-shielding parts.
4. The ink cartridge according to claim 3, further comprising a pivoting arm that is pivotably supported in the cartridge main body,wherein the second light-shielding part is attached to one end of the pivoting arm and the float part is attached to another end of the pivoting arm,wherein the motion of the float part by the fluctuations of the ink level prompts the pivoting arm to pivot and the second light-shielding part to move to the position adjacent to the at least two first light-shielding parts.
5. The ink cartridge according to claim 3, wherein when the float part moves following the fluctuation of the ink level in the ink accommodating chamber, the second light-shielding part moves in a direction parallel to a direction in which the float part moves.
6. The ink cartridge according to claim 1, wherein the ink-outputting section has an ink-outputting channel fluidly communicated with the ink accommodating chamber, and an opening/closing mechanism that opens and closes the ink-outputting channel,wherein the opening/closing mechanism includes:a valve that is movable between a close position and an open position, the valve closing the ink-outputting channel at the close position and opening the ink-outputting channel at the open position; andan urging member that urges the valve toward the close position.
7. The ink cartridge according to claim 6, wherein the cartridge mounting section includes an ink extraction tube that pushes the valve toward the open position and fluidly communicates with the ink-outputting channel when the ink cartridge is mounted on the cartridge mounting section,wherein the ink-outputting section includes a joint part to which the ink extraction tube is inserted,wherein the at least two first-light shielding parts include a frontmost light-shielding part and a rearmost light-shielding part, the frontmost light-shielding part being closest to the cartridge mounting section and the rearmost light-shielding part being farthest to the cartridge mounting section when the ink cartridge is placed for insertion in the cartridge mounting section,wherein a length in the prescribed mounting direction from a front end of the frontmost light-shielding part to a rear end of the rearmost light-shielding part is less than or equal to a connection stroke from a start point for insertion of the ink extraction tube into the joint part to a point where the ink extraction tube moves the valve to the open position.
8. The ink cartridge according to claim 7, wherein the cartridge mounting section includes a locking mechanism that holds the mounted ink cartridge in a locked state,wherein the joint part separates from the ink extraction tube by an urging force of the urging member of the opening/closing mechanism when the locking mechanism unlocks the ink cartridge,wherein a length of the frontmost light-shielding part in the prescribed mounting direction is longer than a length of the rearmost light-shielding part in the prescribed mounting direction.
9. The ink cartridge according to claim 7, wherein the urging member comprises a spring.
10. An ink cartridge mountable on a cartridge mounting section of an inkjet recording system through insertion of the ink cartridge in a prescribed mounting direction, the inkjet recording system including an optical detecting unit, the ink cartridge comprising:a cartridge main body that has an ink accommodating chamber accommodating ink therein;an ink-outputting section that outputs the ink in the ink accommodating chamber; andat least two first light-shielding parts that are juxtaposed in an outputting direction to which the ink-outputting unit outputs the ink at a prescribed interval and that are incapable of moving relative to the cartridge main body, the at least two first light-shielding parts being used in conjunction with the optical detecting unit for detecting mounting and dismounting of the ink cartridge,wherein lengths in the outputting direction of the at least two first light-shielding parts are different from one another.
11. An inkjet recording system comprising:an inkjet recording device that has an inkjet head ejecting ink; andan ink cartridge that is mounted in a cartridge mounting section of the inkjet recording device through insertion of the ink cartridge in a prescribed mounting direction,wherein the inkjet recording device includes an optical detecting unit that has a light emitting part and a light receiving part receiving light from the light emitting part,wherein the ink cartridge includes:a cartridge main body that has an ink accommodating chamber accommodating ink therein;an ink-outputting section that outputs the ink in the ink accommodating chamber; andat least two first light-shielding parts that are juxtaposed in the prescribed mounting direction at a prescribed interval and that are incapable of moving relative to the cartridge main body, the at least two first light-shielding parts being used in conjunction with the optical detecting unit for detecting mounting and dismounting of the ink cartridge,wherein lengths in the prescribed mounting direction of the at least two first light-shielding parts are different from one another.
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