Electrophotographic image forming apparatus, process cartridge developing device, developer supply container and measuring part therefor
First Claim
1. An electrophotographic image forming apparatus for forming an image on a recording material, comprising:
- (a) an electrophotographic photosensitive member;
(b) a developer accommodating portion for accommodating a developer;
(c) developing means for developing an electrostatic latent image formed on said electrophotographic photosensitive member using the developer accommodated in said developer accommodating portion;
(d) a first electrostatic capacity generating portion disposed at such a position that said first electrostatic capacity generating portion is contacting the developer accommodated in said developer accommodating portion when a predetermined amount of the developer is accommodated in said developer accommodating portion, said first electrostatic capacity generating portion generating an electrostatic capacity corresponding to an amount of the developer when said first electrostatic capacity generating portion is supplied with a voltage, and a second electrostatic capacity generating portion disposed at such a position that said second electrostatic capacity generating portion is not contacted to the developer accommodated in said developer accommodating portion, said second electrostatic capacity generating portion generating a reference electrostatic capacity, which is a developer-free electrostatic capacity, when said second electrostatic capacity generating portion is supplied with a voltage;
(e) developer amount detecting means for detecting an amount of the developer accommodated in said developer accommodating portion on the basis of the electrostatic capacity generated by said first electrostatic capacity generating portion and the reference electrostatic capacity generated by said second electrostatic capacity generating portion; and
(f) electrostatic latent image forming means for forming an electrostatic latent image on said electrophotographic photosensitive member.
1 Assignment
0 Petitions
Accused Products
Abstract
An electrophotographic image forming apparatus includes a first electrostatic-capacity generating portion disposed at such a position that the first electrostatic capacity generating portion contacts the developer accommodated in the developer accommodating portion. The first electrostatic capacity generates portion generating an electrostatic capacity corresponding to an amount of the developer. A second electrostatic-capacity generating portion is disposed at such a position that the second electrostatic-capacity generating portion does not contact the developer accommodated in the developer-accommodating portion. The second electrostatic capacity generating portion generates a reference electrostatic capacity. A developer amount detector is provided for detecting an amount of the developer accommodated in the developer-accommodating portion on the basis of the electrostatic capacity generated by the first electrostatic-capacity generating portion and the reference electrostatic capacity generated by the said second electrostatic-capacity generating portion.
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Citations
96 Claims
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1. An electrophotographic image forming apparatus for forming an image on a recording material, comprising:
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(a) an electrophotographic photosensitive member;
(b) a developer accommodating portion for accommodating a developer;
(c) developing means for developing an electrostatic latent image formed on said electrophotographic photosensitive member using the developer accommodated in said developer accommodating portion;
(d) a first electrostatic capacity generating portion disposed at such a position that said first electrostatic capacity generating portion is contacting the developer accommodated in said developer accommodating portion when a predetermined amount of the developer is accommodated in said developer accommodating portion, said first electrostatic capacity generating portion generating an electrostatic capacity corresponding to an amount of the developer when said first electrostatic capacity generating portion is supplied with a voltage, and a second electrostatic capacity generating portion disposed at such a position that said second electrostatic capacity generating portion is not contacted to the developer accommodated in said developer accommodating portion, said second electrostatic capacity generating portion generating a reference electrostatic capacity, which is a developer-free electrostatic capacity, when said second electrostatic capacity generating portion is supplied with a voltage;
(e) developer amount detecting means for detecting an amount of the developer accommodated in said developer accommodating portion on the basis of the electrostatic capacity generated by said first electrostatic capacity generating portion and the reference electrostatic capacity generated by said second electrostatic capacity generating portion; and
(f) electrostatic latent image forming means for forming an electrostatic latent image on said electrophotographic photosensitive member. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A process cartridge detachably mountable to a main assembly of an electrophotographic image forming apparatus, said process cartridge comprising:
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(a) an electrophotographic photosensitive member;
(b) process means actable on said electrophotographic photosensitive member;
(c) first and second electrostatic capacity generating portions for permitting the main assembly of the image forming apparatus to detect an amount of the developer to be used for developing an electrostatic latent image formed on said photosensitive member when said process cartridge is mounted to the main assembly of the image forming apparatus, said first electrostatic capacity generating portion being disposed at such a position that said first electrostatic capacity generating portion is contacted to the developer accommodated in said developer accommodating portion, and said first electrostatic capacity generating portion generating an electrostatic capacity corresponding to an amount of the developer when said first electrostatic capacity generating portion is supplied with a voltage;
said second electrostatic capacity generating portion being disposed at such a position that said second electrostatic capacity generating portion is not contacted to the developer, said second electrostatic capacity generating portion generating a reference electrostatic capacity which is a developer-free electrostatic capacity when said second electrostatic capacity generating portion is supplied with a voltage;
(d) an electrical contact for transmitting to the main assembly of said electrophotographic image forming apparatus a first electric signal corresponding to an electrostatic capacity generated by said first electrostatic capacity generating portion when the voltage is applied thereto from the main assembly of said electrophotographic image forming apparatus and a second electric signal corresponding to the reference electrostatic capacity generated by said second electrostatic capacity generating portion when the voltage is applied thereto from the main assembly of said electrophotographic image forming apparatus. - View Dependent Claims (17, 18, 19, 20, 33, 34, 35)
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21. A process cartridge detachably mountable to a main assembly of an electrophotographic image forming apparatus including a second electrostatic capacity generating portion for generating a reference electrostatic capacity which is a developer-free electrostatic capacity, comprising:
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(a) an electrophotographic photosensitive member;
(b) process means actable on said electrophotographic photosensitive member;
(c) a first electrostatic capacity generating portion for permitting the main assembly of the image forming apparatus to detect an amount of the developer to be used for developing an electrostatic latent image formed on said photosensitive member when said process cartridge is mounted to the main assembly of said electrophotographic image forming apparatus, said first electrostatic capacity generating portion being disposed at such a position that said first electrostatic capacity generating portion is contacted to the developer accommodated in said developer accommodating portion, and said first electrostatic capacity generating portion generating an electrostatic capacity corresponding to an amount of the developer when said first electrostatic capacity generating portion is supplied with the a voltage;
(d) an electrical contact for transmitting to the main assembly of said electrophotographic image forming apparatus a first electric signal corresponding to an electrostatic capacity generated by said first electrostatic capacity generating portion when the voltage is applied thereto from the main assembly of said electrophotographic image forming apparatus, when said process cartridge is mounted to the main assembly of said electrophotographic image forming apparatus;
wherein an amount of the developer accommodated in said process cartridge is detected by the main assembly of said electrophotographic image forming apparatus on the basis of the first electric signal transmitted through said electrical contact from said process cartridge and a second electric signal corresponding to the reference electrostatic capacity generated by the second electrostatic capacity generating portion when a voltage is applied thereto from the main assembly of said electrophotographic image forming apparatus, when said process cartridge is mounted to the main assembly of said electrophotographic image forming apparatus. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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36. An electrophotographic image forming apparatus for forming an image on a recording material, to which apparatus a process cartridge is detachably mountable, said apparatus comprising:
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(a) mounting means for detachably mounting said process cartridge, said process cartridge including;
an electrophotographic photosensitive member;
process means actable on said electrophotographic photosensitive member;
a developer accommodating portion for accommodating a developer for developing an electrostatic latent image formed on said electrophotographic photosensitive member;
first and second electrostatic capacity generating portions for permitting the main assembly of the image forming apparatus to detect an amount of the developer to be used for developing an electrostatic latent image formed on said photosensitive member when said process cartridge is mounted to the main assembly of the image forming apparatus, said first electrostatic capacity generating portion being disposed at such a position that said first electrostatic capacity generating portion is contacted to the developer accommodated in said developer accommodating portion, and said first electrostatic capacity generating portion generating an electrostatic capacity corresponding to an amount of the developer when said first electrostatic capacity generating portion is supplied with a voltage;
said second electrostatic capacity generating portion being disposed at such a position that said second electrostatic capacity generating portion is not contacted to the developer, said second electrostatic capacity generating portion generating a reference electrostatic capacity, which is a developer-free electrostatic capacity, when said second electrostatic capacity generating portion is supplied with a voltage;
an electrical contact for transmitting to the main assembly of said electrophotographic image forming apparatus a first electric signal corresponding to an electrostatic capacity generated by said first electrostatic capacity generating portion when the voltage is applied thereto from the main assembly of said electrophotographic image forming apparatus and a second electric signal corresponding to the reference electrostatic capacity generated by said second electrostatic capacity generating portion when the voltage is applied thereto from the main assembly of said electrophotographic image forming apparatus;
(b) developer amount detecting means for detection an amount of the developer accommodated in the developer accommodating portion of said process cartridge on the basis of the first electric signal and the second electric signal; and
(c) electrostatic latent image forming means for forming an electrostatic latent image on said electrophotographic photosensitive member.
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37. An electrophotographic image forming apparatus for forming an image on a recording material, to which apparatus a process cartridge is detachably mountable, said apparatus comprising:
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(a) mounting means for mounting said process cartridge which is detachably mountable to a main assembly of said electrophotographic image forming apparatus including a second electrostatic capacity which is a developer-free electrostatic capacity, said process cartridge including;
an electrophotographic photosensitive member;
process means actable on said electrophotographic photosensitive member;
a developer accommodating portion for accommodating a developer for developing an electrostatic latent image formed on said electrophotographic photosensitive member;
a first electrostatic capacity generating portion for permitting the main assembly of the image forming apparatus to detect an amount of the developer to be used for developing an electrostatic latent image formed on said photosensitive member when said process cartridge is mounted to the main assembly of the image forming apparatus, said first electrostatic capacity generating portion being disposed at such a position that said first electrostatic capacity generating portion is contacted to the developer accommodated in said developer accommodating portion, and said first electrostatic capacity generating portion generating an electrostatic capacity corresponding to an amount of the developer when said first electrostatic capacity generating portion is supplied with a voltage;
an electrical contact for transmitting to the main assembly of said electrophotographic image forming apparatus a first electric signal corresponding to an electrostatic capacity generated by said first electrostatic capacity generating portion when the voltage is applied thereto from the main assembly of said electrophotographic image forming apparatus, when said process cartridge is mounted to the main assembly of said electrophotographic image forming apparatus;
wherein an amount of the developer accommodated in said process cartridge is detected by the main assembly of said electrophotographic image forming apparatus on the basis of the first electric signal transmitted through said electrical contact from said process cartridge and a second electric signal corresponding to the reference electrostatic capacity generated by a second electrostatic capacity generating portion when a voltage is applied thereon from the main assembly of said electrophotographic image forming apparatus, when said process cartridge is mounted to the main assembly of said electrophotographic image forming apparatus;
(b) detecting means, provided in the main assembly of said electrophotographic image forming apparatus, for detecting an amount of the developer accommodated in said process cartridge on the basis of the first electric signal transmitted through said electrical contact from said process cartridge and the second electric signal corresponding to the reference electrostatic capacity generated by the second electrostatic capacity generating portion when a voltage is applied thereto from the main assembly of said electrophotographic image forming apparatus, when said process cartridge is mounted to the main assembly of said electrophotographic image forming apparatus, wherein an amount of the developer accommodated in said process cartridge is detected by the main assembly of said electrophotographic image forming apparatus on the basis of the first electric signal transmitted through said electrical contact from said process cartridge and a second electric signal corresponding to the reference electrostatic capacity generated by the second electrostatic capacity generating portion when a voltage is applied thereto from the main assembly of said electrophotographic image forming apparatus, when said process cartridge is mounted to the main assembly of said electrophotographic image forming apparatus.
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38. A developing device for an electrophotographic image forming apparatus, said developing device comprising:
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(a) a developer accommodating portion for accommodating a developer;
(b) developing means for developing an electrostatic latent image formed on an electrophotographic photosensitive member using the developer accommodated in said developer accommodating portion;
(c) a first electrostatic capacity generating portion disposed at such a position that said first electrostatic capacity generating portion is contacted to the developer accommodated in said developer accommodating portion when a predetermined amount of the developer is accommodated in said developer accommodating portion, said first electrostatic capacity generating portion generating an electrostatic capacity corresponding to an amount of the developer when said first electrostatic capacity generating portion is supplied with a voltage;
(d) a second electrostatic capacity generating portion disposed at such a position that said second electrostatic capacity generating portion is not contacted to the developer accommodated in said developer accommodating portion, said second electrostatic capacity generating portion generating a reference electrostatic capacity, which is a developer-free electrostatic capacity, when said second electrostatic capacity generating portion is supplied with a voltage; and
(f) an electrical contact for transmitting to a main assembly of said electrophotographic image forming apparatus a first electric signal corresponding to the electrostatic capacity generated by said first electrostatic capacity generating portion when the voltage is applied thereto from the main assembly of said electrophotographic image forming apparatus and a second electric signal corresponding to the reference electrostatic capacity generated by said second electrostatic capacity generating portion when a voltage is applied thereto from the main assembly of said electrophotographic image forming apparatus, when said developing device is mounted to the main assembly of said electrophotographic image forming apparatus. - View Dependent Claims (39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53)
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54. A developer supply container for supplying a developer to a main assembly of an electrophotographic image forming apparatus, said developer supply container comprising:
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(a) a developer accommodating portion for accommodating a developer;
(b) a first electrostatic capacity generating portion disposed at such a position that said first electrostatic capacity generating portion is contacted to the developer accommodated in said developer accommodating portion when a predetermined amount of the developer is accommodated in said developer accommodating portion, said first electrostatic capacity generating portion generating an electrostatic capacity corresponding to an amount of the developer when said first electrostatic capacity generating portion is supplied with a voltage, and a second electrostatic capacity generating portion disposed at such a position that said second electrostatic capacity generating portion is not contacted to the developer accommodated in said developer accommodating portion, said second electrostatic capacity generating portion generating a reference electrostatic capacity, which is a developer-free electrostatic capacity, when said second electrostatic capacity generating portion is supplied with a voltage; and
(c) an electrical contact for transmitting to the main assembly of said electrophotographic image forming apparatus a first electric signal corresponding to the electrostatic capacity generated by said first electrostatic capacity generating portion when the voltage is applied thereto from the main assembly of said electrophotographic image forming apparatus and a second electric signal corresponding to the reference electrostatic capacity generated by said second electrostatic capacity generating portion when a voltage is applied thereto from the main assembly of said electrophotographic image forming apparatus, when said developer supply container is mounted to the main assembly of said electrophotographic image forming apparatus. - View Dependent Claims (55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69)
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70. A measuring part for measuring an amount of a developer contained in a developer accommodating portion for an electrophotographic image forming apparatus for forming an image on a recording material, said measuring part comprising:
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an insulative substrate;
a first electrostatic capacity generating portion disposed at such a position that said first electrostatic capacity generating portion is contacted to the developer accommodated in said developer accommodating portion when a predetermined amount of the developer is accommodated in said developer accommodating portion, said first electrostatic capacity generating portion generating an electrostatic capacity corresponding to an amount of the developer when said first electrostatic capacity generating portion is supplied with a voltage; and
a second electrostatic capacity generating portion disposed at such a position that said second electrostatic capacity generating portion is not contacted to the developer accommodated in said developer accommodating portion, said second electrostatic capacity generating portion generating a reference electrostatic capacity, which is a developer-free electrostatic capacity, when said second electrostatic capacity generating portion is supplied with a voltage, wherein said first electrostatic capacity generating portion and said second electrostatic capacity generating portion are provided on said substrate. - View Dependent Claims (71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81)
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82. A measuring part for measuring the amount of a developer contained in a developer accommodating portion for an electrophotographic image forming apparatus for forming an image on a recording material, said measuring part comprising:
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an insulative substrate; and
a first electrostatic capacity generating portion including first electroconductive portions and second electroconductive portions alternatingly arranged in parallel with each other at regular intervals and a second electrostatic capacity generating portion including third electroconductive portions and fourth electroconductive portions alternatingly arranged in parallel with each other at regular intervals, wherein said first electrostatic capacity generating portion and said second electrostatic capacity generating portion are provided on said insulative substrate. - View Dependent Claims (83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96)
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Specification