means for connecting the different parts of the process cartridge

Industry

CPC
G03G21/1821

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Parent Industries

GPHYSICS G03Photography G03GELECTROGRAPHY ELECTROPHOTOGRAPHY MAGNETOGRAPHY G03G21/00Arrangements not provided for by groups G03G13/00 - G03G19/00

Current Industry

G03G21/1821means for connecting the different parts of the process cartridge

Industries

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Patents Grantslast 30 patents

Information Patent Grant
Image forming apparatus and process cartridge including protrusion...
- Patent number 12,222,673
- Issue date Feb 11, 2025
- Canon Kabushiki Kaisha
- Akira Yoshimura
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Component movement mechanism for an image forming apparatus
- Patent number 12,222,662
- Issue date Feb 11, 2025
- Brother Kogyo Kabushiki Kaisha
- Yoh Nishimura
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Developing cartridge including movable plate for moving holder hold...
- Patent number 12,210,300
- Issue date Jan 28, 2025
- Brother Kogyo Kabushiki Kaisha
- Naoya Kamimura
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Cartridge and image forming apparatus including a recessed backgrou...
- Patent number 12,204,271
- Issue date Jan 21, 2025
- Canon Kabushiki Kaisha
- Yusaku Makino
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Developing cartridge having a lever movable relative to a casing
- Patent number 12,204,273
- Issue date Jan 21, 2025
- Brother Kogyo Kabushiki Kaisha
- Nao Itabashi
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Developing cartridge including shaft and cam having cam surface
- Patent number 12,197,168
- Issue date Jan 14, 2025
- Brother Kogyo Kabushiki Kaisha
- Yuwen Wang
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Positioning member, holding device, process cartridge, and image fo...
- Patent number 12,189,331
- Issue date Jan 7, 2025
- Ricoh Company, Ltd.
- Kazuki Yogosawa
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Toner cartridge latching
- Patent number 12,181,827
- Issue date Dec 31, 2024
- Lexmark International, Inc.
- Randal Scott Williamson
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Developer cartridge
- Patent number 12,174,557
- Issue date Dec 24, 2024
- Brother Kogyo Kabushiki Kaisha
- Yuwen Wang
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Developing cartridge including movable shaft, and cam provided on s...
- Patent number 12,169,385
- Issue date Dec 17, 2024
- Brother Kogyo Kabushiki Kaisha
- Yuwen Wang
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Toner cartridge including memory holder cover having pawl engaged w...
- Patent number 12,164,263
- Issue date Dec 10, 2024
- Brother Kogyo Kabushiki Kaisha
- Ryuji Noda
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Cartridge and image forming apparatus
- Patent number 12,158,722
- Issue date Dec 3, 2024
- Canon Kabushiki Kaisha
- Noriyuki Komatsu
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Image forming apparatus having detachable cartridges and image form...
- Patent number 12,153,373
- Issue date Nov 26, 2024
- Canon Kabushiki Kaisha
- Hirotaka Ishii
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Image forming device
- Patent number 12,147,189
- Issue date Nov 19, 2024
- Brother Kogyo Kabushiki Kaisha
- Kazuna Taguchi
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Process cartridge
- Patent number 12,140,902
- Issue date Nov 12, 2024
- ZHUHAI DINGLONG HUITONG PRINT TECHNOLOGY CO., LTD.
- Honghui Zhou
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Cartridge, member constituting cartridge, and image forming apparatus
- Patent number 12,140,903
- Issue date Nov 12, 2024
- Canon Kabushiki Kaisha
- Masaaki Sato
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Cartridge, member constituting cartridge, and image forming apparatus
- Patent number 12,140,904
- Issue date Nov 12, 2024
- Canon Kabushiki Kaisha
- Masaaki Sato
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Drum unit, cartridge and coupling member
- Patent number 12,124,211
- Issue date Oct 22, 2024
- Canon Kabushiki Kaisha
- Tetsuo Uesugi
- Y10 - TECHNICAL SUBJECTS COVERED BY FORMER USPC
Information Patent Grant
Developing cartridge including casing, and first lever pivotally mo...
- Patent number 12,124,210
- Issue date Oct 22, 2024
- Brother Kogyo Kabushiki Kaisha
- Shuhei Hatano
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Development device, process cartridge, and image forming apparatus
- Patent number 12,117,763
- Issue date Oct 15, 2024
- Canon Kabushiki Kaisha
- Hiroaki Nosho
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Process unit
- Patent number 12,117,766
- Issue date Oct 15, 2024
- Brother Kogyo Kabushiki Kaisha
- Masatoshi Shiraki
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Electrophotographic image forming apparatus and cartridge
- Patent number 12,111,607
- Issue date Oct 8, 2024
- Canon Kabushiki Kaisha
- Yuichi Fukui
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Photosensitive member unit and development unit
- Patent number 12,111,608
- Issue date Oct 8, 2024
- Canon Kabushiki Kaisha
- Masao Uyama
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Image forming apparatus
- Patent number 12,105,462
- Issue date Oct 1, 2024
- Canon Kabushiki Kaisha
- Shunsuke Matsushita
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Process cartridge and image forming apparatus
- Patent number 12,099,325
- Issue date Sep 24, 2024
- Canon Kabushiki Kaisha
- Noriyuki Komatsu
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Process unit and image-forming apparatus
- Patent number 12,092,968
- Issue date Sep 17, 2024
- SHARP KABUSHIKI KAISHA
- Takeshi Nishiyama
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Unit accommodation apparatus and image forming apparatus
- Patent number 12,092,989
- Issue date Sep 17, 2024
- Ricoh Company, Ltd.
- Tomoaki Suga
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Replaceable unit for an electrophotographic image forming device ha...
- Patent number 12,078,954
- Issue date Sep 3, 2024
- Lexmark International, Inc.
- Jeremy Keith Payne
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Drum unit, cartridge and coupling member
- Patent number 12,072,668
- Issue date Aug 27, 2024
- Canon Kabushiki Kaisha
- Tetsuo Uesugi
- Y10 - TECHNICAL SUBJECTS COVERED BY FORMER USPC
Information Patent Grant
Image forming apparatus requesting execution of density correction...
- Patent number 12,050,428
- Issue date Jul 30, 2024
- Brother Kogyo Kabushiki Kaisha
- Tadao Kyotani
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY

Patents Applicationslast 30 patents

Information Patent Application
STORAGE ASSEMBLY AND MOUNTABLE UNIT
- Publication number 20250053116
- Publication date Feb 13, 2025
- JIANGXI YIBO E-TECH CO. LTD.
- Shiping AO
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Application
Process Unit
- Publication number 20250036074
- Publication date Jan 30, 2025
- BROTHER KOGYO KABUSHIKI KAISHA
- Masatoshi SHIRAKI
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Application
IMAGE FORMING APPARATUS INCLUDING DRUM CARTRIDGE AND TONER CARTRIDG...
- Publication number 20250036075
- Publication date Jan 30, 2025
- BROTHER KOGYO KABUSHIKI KAISHA
- Shougo Sato
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Application
PRESSING MECHANISM, A PROCESS CARTRIDGE, AND AN IMAGE FORMING APPAR...
- Publication number 20250021045
- Publication date Jan 16, 2025
- Hiroshi FUJIWARA
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Application
DEVELOPING CARTRIDGE HAVING ELECTRODE CONTACTABLE WITH ANOTHER ELEC...
- Publication number 20250013165
- Publication date Jan 9, 2025
- BROTHER KOGYO KABUSHIKI KAISHA
- Yuwen Wang
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Application
IMAGE FORMING DEVICE
- Publication number 20250013193
- Publication date Jan 9, 2025
- BROTHER KOGYO KABUSHIKI KAISHA
- Kazuna TAGUCHI
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Application
DEVELOPING CARTRIDGE INCLUDING CASING, AND FIRST LEVER PIVOTALLY MO...
- Publication number 20250013191
- Publication date Jan 9, 2025
- BROTHER KOGYO KABUSHIKI KAISHA
- Shuhei HATANO
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Application
CARTRIDGE AND IMAGE FORMING APPARATUS
- Publication number 20250013192
- Publication date Jan 9, 2025
- Canon Kabushiki Kaisha
- ISAO KOISHI
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Application
DEVELOPMENT DEVICE, PROCESS CARTRIDGE, AND IMAGE FORMING APPARATUS
- Publication number 20250004417
- Publication date Jan 2, 2025
- Canon Kabushiki Kaisha
- Hiroaki Nosho
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Application
PHOTOSENSITIVE MEMBER UNIT AND DEVELOPMENT UNIT
- Publication number 20250004418
- Publication date Jan 2, 2025
- Canon Kabushiki Kaisha
- Masao Uyama
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Application
PROCESS CARTRIDGE, ELECTROPHOTOGRAPHIC IMAGE FORMING APPARATUS, AND...
- Publication number 20240419122
- Publication date Dec 19, 2024
- Canon Kabushiki Kaisha
- Takahito Ueno
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Application
IMAGE FORMING APPARATUS
- Publication number 20240419120
- Publication date Dec 19, 2024
- Canon Kabushiki Kaisha
- Shunsuke Matsushita
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Application
CARTRIDGE AND IMAGE FORMING APPARATUS INCLUDING A RECESSED BACKGROU...
- Publication number 20240411263
- Publication date Dec 12, 2024
- Canon Kabushiki Kaisha
- Yusaku MAKINO
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Application
ELECTROPHOTOGRAPHIC IMAGE FORMING APPARATUS AND CARTRIDGE
- Publication number 20240411265
- Publication date Dec 12, 2024
- Canon Kabushiki Kaisha
- Yuichi Fukui
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Application
PROCESS CARTRIDGE AND IMAGE FORMING APPARATUS
- Publication number 20240411266
- Publication date Dec 12, 2024
- Canon Kabushiki Kaisha
- Noriyuki Komatsu
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Application
DEVELOPING CARTRIDGE AND ELECTRONIC IMAGING APPARATUS
- Publication number 20240402644
- Publication date Dec 5, 2024
- Zhuhai Ninestar Information Technology Co., Ltd
- Geming DING
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Application
CARTRIDGE AND IMAGE FORMING APPARATUS
- Publication number 20240385570
- Publication date Nov 21, 2024
- Canon Kabushiki Kaisha
- NORIYUKI KOMATSU
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Application
CARTRIDGE INCLUDING PHOTOSENSITIVE DRUM AND DEVELOPING ROLLER THAT...
- Publication number 20240345536
- Publication date Oct 17, 2024
- Canon Kabushiki Kaisha
- Toshiaki TAKEUCHI
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Application
CARTRIDGE, PROCESS CARTRIDGE AND ELECTROPHOTOGRAPHIC IMAGE FORMING...
- Publication number 20240319663
- Publication date Sep 26, 2024
- Canon Kabushiki Kaisha
- Masaaki Sato
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Application
IMAGE FORMING APPARATUS
- Publication number 20240319652
- Publication date Sep 26, 2024
- FUJIFILM Business Innovation Corp.
- Yoshiyuki TOMINAGA
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Application
DRUM UNIT, CARTRIDGE AND COUPLING MEMBER
- Publication number 20240310779
- Publication date Sep 19, 2024
- Canon Kabushiki Kaisha
- Tetsuo Uesugi
- Y10 - TECHNICAL SUBJECTS COVERED BY FORMER USPC
Information Patent Application
CARTRIDGE, MEMBER CONSTITUTING CARTRIDGE, AND IMAGE FORMING APPARATUS
- Publication number 20240302789
- Publication date Sep 12, 2024
- Canon Kabushiki Kaisha
- Masaaki Sato
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Application
CARTRIDGE, MEMBER CONSTITUTING CARTRIDGE, AND IMAGE FORMING APPARATUS
- Publication number 20240302788
- Publication date Sep 12, 2024
- Canon Kabushiki Kaisha
- Masaaki Sato
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Application
HOUSING POSITIONS FOR TONER TRANSFER
- Publication number 20240288798
- Publication date Aug 29, 2024
- Hewlett-Packard Development Company, L.P.
- Jeffrey Harold Luke
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Application
CARTRIDGE, MEMBER CONSTITUTING CARTRIDGE, AND IMAGE FORMING APPARATUS
- Publication number 20240280937
- Publication date Aug 22, 2024
- Canon Kabushiki Kaisha
- Masaaki Sato
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Application
PROCESS CARTRIDGE
- Publication number 20240272582
- Publication date Aug 15, 2024
- JIANGXI YIBO E-TECH CO. LTD.
- Xiaomin GONG
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Application
DEVELOPING CARTRIDGE INCLUDING SHAFT AND CAM HAVING CAM SURFACE
- Publication number 20240272580
- Publication date Aug 15, 2024
- BROTHER KOGYO KABUSHIKI KAISHA
- Yuwen Wang
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Application
IMAGE FORMING APPARATUS
- Publication number 20240219865
- Publication date Jul 4, 2024
- BROTHER KOGYO KABUSHIKI KAISHA
- Shougo Sato
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Application
CARTRIDGE AND ELECTROPHOTOGRAPHIC IMAGE FORMING APPARATUS
- Publication number 20240219866
- Publication date Jul 4, 2024
- Canon Kabushiki Kaisha
- Yosuke Kashiide
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Application
PROCESS CARTRIDGE AND IMAGE FORMING APPARATUS
- Publication number 20240210874
- Publication date Jun 27, 2024
- Kazuo Chadani
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY

means for connecting the different parts of the process cartridge

Industry

Parent Industries

Current Industry

Patents Grantslast 30 patents

Image forming apparatus and process cartridge including protrusion...

Component movement mechanism for an image forming apparatus

Developing cartridge including movable plate for moving holder hold...

Cartridge and image forming apparatus including a recessed backgrou...

Developing cartridge having a lever movable relative to a casing

Developing cartridge including shaft and cam having cam surface

Positioning member, holding device, process cartridge, and image fo...

Toner cartridge latching

Developer cartridge

Developing cartridge including movable shaft, and cam provided on s...

Toner cartridge including memory holder cover having pawl engaged w...

Cartridge and image forming apparatus

Image forming apparatus having detachable cartridges and image form...

Image forming device

Process cartridge

Cartridge, member constituting cartridge, and image forming apparatus

Cartridge, member constituting cartridge, and image forming apparatus

Drum unit, cartridge and coupling member

Developing cartridge including casing, and first lever pivotally mo...

Development device, process cartridge, and image forming apparatus

Process unit

Electrophotographic image forming apparatus and cartridge

Photosensitive member unit and development unit

Image forming apparatus

Process cartridge and image forming apparatus

Process unit and image-forming apparatus

Unit accommodation apparatus and image forming apparatus

Replaceable unit for an electrophotographic image forming device ha...

Drum unit, cartridge and coupling member

Image forming apparatus requesting execution of density correction...

Patents Applicationslast 30 patents

STORAGE ASSEMBLY AND MOUNTABLE UNIT

Process Unit

IMAGE FORMING APPARATUS INCLUDING DRUM CARTRIDGE AND TONER CARTRIDG...

PRESSING MECHANISM, A PROCESS CARTRIDGE, AND AN IMAGE FORMING APPAR...

DEVELOPING CARTRIDGE HAVING ELECTRODE CONTACTABLE WITH ANOTHER ELEC...

IMAGE FORMING DEVICE

DEVELOPING CARTRIDGE INCLUDING CASING, AND FIRST LEVER PIVOTALLY MO...

CARTRIDGE AND IMAGE FORMING APPARATUS

DEVELOPMENT DEVICE, PROCESS CARTRIDGE, AND IMAGE FORMING APPARATUS

PHOTOSENSITIVE MEMBER UNIT AND DEVELOPMENT UNIT

PROCESS CARTRIDGE, ELECTROPHOTOGRAPHIC IMAGE FORMING APPARATUS, AND...

IMAGE FORMING APPARATUS

CARTRIDGE AND IMAGE FORMING APPARATUS INCLUDING A RECESSED BACKGROU...

ELECTROPHOTOGRAPHIC IMAGE FORMING APPARATUS AND CARTRIDGE

PROCESS CARTRIDGE AND IMAGE FORMING APPARATUS

DEVELOPING CARTRIDGE AND ELECTRONIC IMAGING APPARATUS

CARTRIDGE AND IMAGE FORMING APPARATUS

CARTRIDGE INCLUDING PHOTOSENSITIVE DRUM AND DEVELOPING ROLLER THAT...

CARTRIDGE, PROCESS CARTRIDGE AND ELECTROPHOTOGRAPHIC IMAGE FORMING...

IMAGE FORMING APPARATUS

DRUM UNIT, CARTRIDGE AND COUPLING MEMBER

CARTRIDGE, MEMBER CONSTITUTING CARTRIDGE, AND IMAGE FORMING APPARATUS

CARTRIDGE, MEMBER CONSTITUTING CARTRIDGE, AND IMAGE FORMING APPARATUS

HOUSING POSITIONS FOR TONER TRANSFER

CARTRIDGE, MEMBER CONSTITUTING CARTRIDGE, AND IMAGE FORMING APPARATUS

PROCESS CARTRIDGE

DEVELOPING CARTRIDGE INCLUDING SHAFT AND CAM HAVING CAM SURFACE

IMAGE FORMING APPARATUS

CARTRIDGE AND ELECTROPHOTOGRAPHIC IMAGE FORMING APPARATUS

PROCESS CARTRIDGE AND IMAGE FORMING APPARATUS