摘要:
A life time informing device for a photosensitive member (101) comprising a body (101) to be charged, a charging member (102) for charging the charge body (101), the charging member is adapted to receive an oscillating voltage and to be in contact with the charge body during the charging operation, and informing means (126) for visually or acoustically informing whether the photosensitive member (101) reaches the life time thereof, based on an accumulated time of the application time during which the oscillating voltage is applied.
摘要:
A developer regulation member includes developer regulation means (35) for regulating an amount of developer carried on a developer carrying member (33). The developer regulation means includes a first regulation portion (11) formed of a first material which has a Shore D hardness of not less than 70 degrees or is metal, and a second regulation portion (12) which is disposed opposite to the developer carrying member and is formed of a material different from the first material for the first regulation portion. The second regulation portion has an edge which is in contact with the developer carrying member.
摘要:
The present invention provides an image forming apparatus which comprises an image bearing member (1), a charging rotary member (8) rotating while contacting with the image bearing member, and a slide friction sheet (81) contacting with the charging rotary member along an axial direction of the charging rotary member for dispersing a contamination adhered to the charging rotary member.
摘要:
A developing device includes a developer carrying member (4b) for carrying a layer of developer, the developer carrying member forming a developing zone (b) where the layer of the developer is contacted to the developer carrying member and to an image bearing member (1) carrying a latent image; and a charge application member (4e) for applying electric charge to the developer carried on the developer carrying member by electric discharge, the charge application member being provided upstream of the developing zone with respect to a moving direction of the developer carrying member.
摘要:
The present invention provides a developing apparatus which has a developer carrying body carrying a developer thereon, and a layer thickness regulating member for regulating the layer thickness of the developer carried on the developer carrying body, the developer carried on the developer carrying body contacting with an image bearing body after the layer thickness thereof has been regulated by the layer thickness regulating member. In the developing apparatus, when the charge amount per 1 g of the developer after the layer thickness has been regulated by the layer thickness regulating member and before the developer contacts with the image bearing body is defined as Q (µC/g) and the electrical resistance per axial length 1 mm of the developer carrying body is defined as R (Ω/mm),R ≥ 0.9 × (-7.83 × 104 |Q| + 7.05 × 106) andR ≤ 1.1 × (-7.83 × 104 |Q| + 7.05 × 106) are satisfied.
摘要:
An image-forming apparatus and a process cartridge, both comprising an image-bearing member (1) for holding thereon an electrostatic latent image; a charging means (5) for charging the surface of the image-bearing member electrostatically; an exposure unit (6) for forming the electrostatic latent image on the image-bearing member by exposing to light the image-bearing member as charged; a developing unit (3) with at least one toner-carrying member (2) for carrying and transporting a negatively chargeable toner (10) thereon that has toner particles and at least one external additive, for developing the electrostatic latent image by contact developing. Regarding triboelectric series relationship the toner particles, surface layer of the image-bearing member and external additive are thus ordered from the negative side, respectively, while the image-bearing member has a latent image surface potential within a range of -500 V and-800 V, as non-image area potential Vd, and within a range of -50 V and -200 V as image area potential VI for maximum toner image density. Also, the charge polarity of the surface layer of the image-bearing member may be different with respect to that of the toner in the development unit.
摘要:
An image-forming apparatus and a process cartridge, both comprising an image-bearing member (1) for holding thereon an electrostatic latent image; a charging means (5) for charging the surface of the image-bearing member electrostatically; an exposure unit (6) for forming the electrostatic latent image on the image-bearing member by exposing to light the image-bearing member as charged; a developing unit (3) with at least one toner-carrying member (2) for carrying and transporting a negatively chargeable toner (10) thereon that has toner particles and at least one external additive, for developing the electrostatic latent image by contact developing. Regarding triboelectric series relationship the toner particles, external additive and surface layer of the image-bearing member are thus ordered from the negative side, respectively, while the image-bearing member has a latent image surface potential wihtin a range of -500 V and -800 V as non-image area potential Vd, and within a range of -50 V and -200 V as image area potential VI for maximum toner image density. Also, the charge polarity of the surface layer of the image-bearing member may be different with respect to that of the toner in the developing unit.