Developing cartridge

1. A developing cartridge comprising:

a casing for accommodating developer therein;

a developing roller rotatable about an axis extending in a first direction;

a storage medium having an electrical contact surface; and

a holder movable relative to the casing, the holder having an outer surface at which the electrical contact surface is positioned, the holder being positioned at a side of the casing in the first direction.

2. The developing cartridge according to claim 1 ,

wherein the developing roller is positioned at one side of the casing in a second direction, and

wherein the holder is movable relative to the casing in the second direction.

3. The developing cartridge according to claim 2 ,

wherein the holder is movable relative to the casing in a third direction crossing the electrical contact surface.

4. The developing cartridge according to claim 3 ,

wherein the third direction is crossing the first direction and the second direction.

5. The developing cartridge according to claim 3 ,

wherein the third direction is perpendicular to the first direction and the second direction.

6. The developing cartridge according to claim 1 ,

wherein the second direction is crossing the first direction.

7. The developing cartridge according to claim 1 ,

wherein the second direction is perpendicular to the first direction.

8. The developing cartridge according to claim 1 ,

wherein the developing roller is positioned at one side of the casing in a second direction, and

wherein the holder includes an elastic member configured to be stretched or compressed in a third direction crossing the electrical contact surface.

9. The developing cartridge according to claim 8 ,

wherein the elastic member is configured to be stretched or compressed between a first state and a second state, and a length in the third direction of the elastic member in the first state being greater than a length in the third direction of the elastic member in the second state.

10. The developing cartridge according to claim 9 ,

wherein a length in the third direction of the elastic member in the second state is smaller than a natural length in the third direction of the elastic member.

11. The developing cartridge according to claim 8 ,

wherein the elastic member is a spring.

12. The developing cartridge according to claim 11 ,

wherein the spring is a coil spring.

13. The developing cartridge according to claim 1 , further comprising:

a holder cover positioned at the side of the casing in the first direction, and covering at least a portion of the holder.

14. The developing cartridge according to claim 13 ,

wherein the holder cover has a first through-hole, and

wherein the holder includes a first boss extending in the first direction and inserted through the first through-hole.

15. The developing cartridge according to claim 14 ,

wherein the first through-hole has a dimension greater than a dimension of the first boss.

16. The developing cartridge according to claim 14 ,

wherein the casing has a second through-hole at the side of the casing in the first direction, and

wherein the holder includes a second boss extending in the first direction and positioned opposite to the first boss relative to the holder, the second boss being inserted through the second through-hole.

17. The developing cartridge according to claim 16 ,

wherein the second through-hole has a dimension greater than a dimension of the second boss.

18. The developing cartridge according to claim 1 ,

wherein the outer surface is configured to hold the electrical contact surface of the storage medium.

19. The developing cartridge according to claim 18 ,

wherein the outer surface is configured to hold the storage medium.

20. The developing cartridge according to claim 1 ,

wherein the holder is movable relative to the casing in the first direction.