Chip and replaceable unit of image forming apparatus

1. A chip, used for a replaceable unit of an image forming apparatus, wherein the image forming apparatus is provided with an electrical contact terminal, the chip comprising:

a storage unit, configured to store related parameters of the replaceable unit;

a plurality of electrical contacts, wherein an electrical contact of the plurality of electrical contacts is capable of electrically connecting to the electrical contact terminal; and

an impedance branch, wherein one end of the impedance branch is connected to at least one of the plurality of electrical contacts for achieving a detection of contact reliability between the at least one of the plurality of electrical contacts connected to the impedance branch and the electrical contact terminal of the image forming apparatus.

2. The chip according to claim 1 , wherein another end of the impedance branch is connected to another electrical contact, such that after the chip is installed to the image forming apparatus, a loop for detecting a reliability of electrical connection is formed.

3. The chip according to claim 2 , wherein one end of the impedance branch is connected to a clock signal terminal of the image forming apparatus, and another end of the impedance branch is connected to a data signal terminal of the image forming apparatus.

4. The chip according to claim 3 , wherein the impedance branch includes a resistance element having a predetermined impedance value, wherein the resistance element has an end connected to the clock signal terminal, and another end connected to the data signal terminal.

5. The chip according to claim 2 , wherein the loop for detecting the reliability of the electrical connection is a loop formed between the image forming apparatus and the chip after the replaceable unit is installed to the image forming apparatus; by sampling voltage and/or current of the loop, electrical characteristics formed by contact between the at least one of the plurality of electrical contacts in the chip and a corresponding electrical contact terminal of the image forming apparatus in the loop is obtained, and based on the electrical characteristics formed by the contact, the reliability of electrical connection between the at least one of the plurality of electrical contacts in the chip and the corresponding electrical contact terminal of the image forming apparatus is determined.

6. The chip according to claim 1 , wherein another end of the impedance branch is ground, such that after the chip is installed to the image forming apparatus, a loop for detecting a reliability of electrical connection is formed.

7. A replaceable unit for an image forming apparatus, comprising:

a developing cartridge, wherein the developing cartridge is provided with a case, a developer accommodation unit for accommodating developer in the case, a developer-feed element that feeds the developer, and a chip located on an outer surface of the case, the chip comprising:

a storage unit, storing performance parameters of the replaceable unit, and

a plurality of electrical contacts, wherein an electrical contact is capable of electrically connecting to an electrical contact terminal of the image forming apparatus,

wherein the chip further includes:

an impedance branch, wherein one end of the impedance branch is connected to at least one of the plurality of electrical contacts for achieving a detection of contact reliability between the at least one of the plurality of electrical contacts connected to the impedance branch and the electrical contact terminal of the image forming apparatus.

8. The replaceable unit according to claim 7 , wherein another end of the impedance branch is connected to another electrical contact, such that after the chip is installed to the image forming apparatus, a loop for detecting a reliability of electrical connection is formed.

9. The replaceable unit according to claim 8 , wherein one end of the impedance branch is connected to a clock signal terminal of the image forming apparatus, and another end of the impedance branch is connected to a data signal terminal of the image forming apparatus.

10. The replaceable unit according to claim 9 , wherein the impedance branch includes a resistance element having a predetermined impedance value, wherein the resistance element has an end connected to the clock signal terminal, and another end connected to the data signal terminal.

11. The replaceable unit according to claim 8 , wherein the loop for detecting the reliability of the electrical connection is a loop formed between the image forming apparatus and the chip after the replaceable unit is installed to the image forming apparatus; by sampling voltage and/or current of the loop, electrical characteristics formed by contact between the at least one of the plurality of electrical contacts in the chip and a corresponding electrical contact terminal of the image forming apparatus in the loop is obtained; and based on the electrical characteristics formed by the contact, the reliability of electrical connection between the at least one of the plurality of electrical contacts in the chip and the corresponding electrical contact terminal of the image forming apparatus is determined.

12. The replaceable unit according to claim 7 , wherein another end of the impedance branch is ground, such that after the chip is installed to the image forming apparatus, a loop for detecting a reliability of electrical connection is formed.

13. A replaceable unit for an image forming apparatus, comprising:

a drum unit, wherein the drum unit is provided with a developing cartridge accommodation part for accommodating a developing cartridge, a photosensitive drum, a charging roller for charging the photosensitive drum, and a chip located on an outer surface of a case of the drum unit, the chip comprising:

a storage unit, storing performance parameters of the replaceable unit, and

a plurality of electrical contacts, wherein an electrical contact is capable of electrically connecting to an electrical contact terminal of the image forming apparatus,

wherein the chip further includes:

an impedance branch, wherein one end of the impedance branch is connected to at least one of the plurality of electrical contacts for achieving a detection of contact reliability between the at least one of the plurality of electrical contacts connected to the impedance branch and the electrical contact terminal of the image forming apparatus.

14. The replaceable unit according to claim 13 , wherein another end of the impedance branch is connected to another electrical contact, such that after the chip is installed to the image forming apparatus, a loop for detecting a reliability of electrical connection is formed.

15. The replaceable unit according to claim 14 , wherein one end of the impedance branch is connected to a clock signal terminal of the image forming apparatus, and another end of the impedance branch is connected to a data signal terminal of the image forming apparatus.

16. The replaceable unit according to claim 15 , wherein the impedance branch includes a resistance element having a predetermined impedance value, wherein the resistance element has an end connected to the clock signal terminal, and another end connected to the data signal terminal.

17. The replaceable unit according to claim 14 , wherein the loop for detecting the reliability of the electrical connection is a loop formed between the image forming apparatus and the chip after the replaceable unit is installed to the image forming apparatus; by sampling voltage and/or current of the loop, electrical characteristics formed by contact between the at least one of the plurality of electrical contacts in the chip and a corresponding electrical contact terminal of the image forming apparatus in the loop is obtained; and based on the electrical characteristics formed by the contact, the reliability of electrical connection between the at least one of the plurality of electrical contacts in the chip and the corresponding electrical contact terminal of the image forming apparatus is determined.

18. The replaceable unit according to claim 13 , wherein another end of the impedance branch is ground, such that after the chip is installed to the image forming apparatus, a loop for detecting a reliability of electrical connection is formed.