公开(公告)号：DE60140638D1

公开(公告)日：2010-01-14

申请号：DE60140638

申请日：2001-04-04

Applicant: SHARP KK

Inventor： MUTOU YOSHINORI ,  TOYOSHIMA TETSURO ,  IWAMATSU TADASHI ,  AZUMA NOBUYUKI ,  NAKAJIMA YOSHINORI

IPC: B41J2/44 ,  H04N1/40 ,  G03G15/04 ,  H04N1/29

Abstract: An exposure apparatus for image formation uses power control means provided to a laser driver (6) for controlling exposure energy and accordingly forming an image. Specifically, exposure energy is varied depending on an isolated-dot pattern and an isolated-line pattern by changing the pulse height (drive power) of a drive pulse for each dot. Both of the isolated-line and isolated-dot patterns of a high resolution can thus be reproduced with a high image quality without increase of cost due to requirements for accuracy in processing and positioning of a lens and without decrease of life of a photoreceptor (11) due to a decreased thickness of its photosensitive layer.

公开(公告)号：DE69332214D1

公开(公告)日：2002-09-19

申请号：DE69332214

申请日：1993-06-29

Applicant: SHARP KK

Inventor： TOYOSHIMA TETSURO ,  UEDA TETSUYUKI ,  INOUE ATSUSHI ,  KAMIMURA TAISUKE ,  FUJITA HIDEAKI ,  YAMANAKA TAKAYUKI

IPC: G03G15/06 ,  G03G15/08

Abstract: The present invention relates to a developing device for developing, by using a developer (13, 16; 27, 107), a latent image formed on a surface of an image data forming member (7; 21; 101), comprising: a developer accommodating section (14; 26; 103) for accommodating the developer; a developer retaining member (2; 23; 102) for receiving the developer from the developer accommodating section (14; 26; 103) and transporting the developer to the latent image formed on the image data forming member (7; 21; 101); an electrode (4; 24; 104) provided at a position which is downstream from the developer accommodating section (14; 26; 103) and upstream from the image data forming member (7; 21; 101) in a direction in which the developer is transported, the electrode (4; 24; 104) being opposed to the developer retaining member (2; 23; 102); and voltage applying means (10; 25; 105, 106) for applying a DC voltage between the electrode (4; 24; 104) and the developer retaining member (2; 23; 102) so that the electric sign of the electrode (4; 24; 104) be identical to that of the toner charge.

公开(公告)号：DE69305889D1

公开(公告)日：1996-12-19

申请号：DE69305889

申请日：1993-03-05

Applicant: SHARP KK

Inventor： IWAMATSU TADASHI ,  TOYOSHIMA TETSURO

IPC: G02B26/10

Abstract: A holographic scanner for scanning a surface (9) with a light beam (14) is provided. The holographic scanner includes a light source (16) for emitting light used as the light beam, a front hologram (2) for diffracting the light (10) emitted from the light source to produce a first diffracted beam (12), a rotary hologram disk (11) having a disk plane and rotatable around an axis thereof vertical to the disk plane, the rotary hologram disk including a plurality (6) of scanning holograms arranged on the disk plane in a circumferential direction, the scanning holograms diffracting the first diffracted beam (12) to produce a second diffracted beam (13), and a rear hologram (3) for diffracting the second diffracted beam to produce a third diffracted beam (14), the third diffracted beam being used as the light beam for illuminating the scanning plane.

公开(公告)号：DE60031039D1

公开(公告)日：2006-11-16

申请号：DE60031039

申请日：2000-06-09

Applicant: SHARP KK

Inventor： MUTOU YOSHINORI ,  TOYOSHIMA TETSURO ,  IWAMATSU TADASHI ,  AZUMA NOBUYUKI ,  NAKAJIMA YOSHINORI

IPC: G03G15/00 ,  H04N1/40 ,  B41J2/44 ,  G02B26/10 ,  G03G15/04 ,  G03G15/043 ,  G06K15/12 ,  H04N1/06

公开(公告)号：DE69718602T2

公开(公告)日：2003-11-13

申请号：DE69718602

申请日：1997-10-29

Applicant: SHARP KK

Inventor： TOYOSHIMA TETSURO ,  AZUMA NOBUYUKI ,  YAMANAKA TAKAYUKI

IPC: G03G15/08

Abstract: A developing device has a development roller for carrying toner on a surface thereof, a toner supply roller for supplying the toner to the development roller, a flat spring which comes into contact with the development roller, charges the toner to be supplied to the development roller and applies the toner to the development roller while regulating the thickness of a layer of the toner. The flat spring has a plurality of flat-plate parts including a contact flat-plate part which comes into contact with the development roller, and a curved part which connects the flat-plate parts to each other. In this structure, by arbitrarily selecting dimensional parameters of the flat spring, it is possible to easily obtain various flat springs having different properties. Therefore, for example, the stress to the toner and the stress to the members can be easily reduced simultaneously with a design of the flat spring. Moreover, it is possible to improve the uniformity of the toner layer thickness in the axis direction of the development roller and the uniformity of charging of the toner.

公开(公告)号：DE69033854T2

公开(公告)日：2002-06-13

申请号：DE69033854

申请日：1990-12-24

Applicant: SHARP KK

Inventor： TOYOSHIMA TETSURO ,  UEDA TETSUYUKI

IPC: G02B26/10

Abstract: A method of recording a hologram (22) by mutual interference of an object light (47) and a reference light (49) on a hologram recording plane of a hologram disk (23). At least one of the object light and the reference light is an aberrational wave so that said hologram has interference fringes different from quadratic curves. In one method the aberrational wave (49) is generated by inputting a spherical wave (48) to an anamorphic lens (41) whose power distribution is determined by mathematical programming so that an aberration of a deflected reproducing light beam (36) on an image surface (24) during reproduction of the hologram is minimized. In another method the aberrational wave is generated by inputting a spherical wave to a compound optical system including a prism and a spherical lens whose parameters in shape are determined by mathematical programming so that an aberration of a deflected reproducing light beam on an image surface during reproduction of the hologram is minimized. In the hologram scanner the hologram recorded by one of these methods is disposed on a rotatable hologram disk for deflecting a reproducing light beam by diffraction so as to scan an image surface by the deflected reproducing light beam during a rotation of said hologram disk.

公开(公告)号：DE69033854D1

公开(公告)日：2001-12-20

申请号：DE69033854

申请日：1990-12-24

Applicant: SHARP KK

Inventor： TOYOSHIMA TETSURO ,  UEDA TETSUYUKI

IPC: G02B26/10

Abstract: A method of recording a hologram (22) by mutual interference of an object light (47) and a reference light (49) on a hologram recording plane of a hologram disk (23). At least one of the object light and the reference light is an aberrational wave so that said hologram has interference fringes different from quadratic curves. In one method the aberrational wave (49) is generated by inputting a spherical wave (48) to an anamorphic lens (41) whose power distribution is determined by mathematical programming so that an aberration of a deflected reproducing light beam (36) on an image surface (24) during reproduction of the hologram is minimized. In another method the aberrational wave is generated by inputting a spherical wave to a compound optical system including a prism and a spherical lens whose parameters in shape are determined by mathematical programming so that an aberration of a deflected reproducing light beam on an image surface during reproduction of the hologram is minimized. In the hologram scanner the hologram recorded by one of these methods is disposed on a rotatable hologram disk for deflecting a reproducing light beam by diffraction so as to scan an image surface by the deflected reproducing light beam during a rotation of said hologram disk.

公开(公告)号：DE69320882T2

公开(公告)日：1999-05-12

申请号：DE69320882

申请日：1993-06-29

Applicant: SHARP KK

Inventor： TOYOSHIMA TETSURO ,  UEDA TETSUYUKI ,  INOUE ATSUSHI ,  KAMIMURA TAISUKE ,  FUJITA HIDEAKI ,  YAMANAKA TAKAYUKI

IPC: G03G15/06 ,  G03G15/08

Abstract: The present invention relates to a developing device for developing, by using a developer (13, 16; 27, 107), a latent image formed on a surface of an image data forming member (7; 21; 101), comprising: a developer accommodating section (14; 26; 103) for accommodating the developer; a developer retaining member (2; 23; 102) for receiving the developer from the developer accommodating section (14; 26; 103) and transporting the developer to the latent image formed on the image data forming member (7; 21; 101); an electrode (4; 24; 104) provided at a position which is downstream from the developer accommodating section (14; 26; 103) and upstream from the image data forming member (7; 21; 101) in a direction in which the developer is transported, the electrode (4; 24; 104) being opposed to the developer retaining member (2; 23; 102); and voltage applying means (10; 25; 105, 106) for applying a DC voltage between the electrode (4; 24; 104) and the developer retaining member (2; 23; 102) so that the electric sign of the electrode (4; 24; 104) be identical to that of the toner charge.

公开(公告)号：JP2002123071A

公开(公告)日：2002-04-26

申请号：JP2000315332

申请日：2000-10-16

Applicant: SHARP KK

Inventor： TOYOSHIMA TETSURO ,  IWAMATSU TADASHI ,  AZUMA NOBUYUKI ,  MUTO YOSHINORI

IPC: B41J2/44 ,  G03G5/04 ,  G03G15/04 ,  G03G15/043 ,  H04N1/113 ,  H04N1/29

Abstract: PROBLEM TO BE SOLVED: To provide an electrophotographic image pickup unit by which a toner image obtained by development is stuck by a desired ratio even in the case that a beam size is larger than a dot pitch. SOLUTION: In a digital electrophotographic image pickup process by which an electrostatic latent image is written in an electrified photoreceptor by using the exposure beam size Ds of a larger size than that of a picture element pitch Dp and is developed by the development, the non-saturation area of the light discharge characteristic of an photoreceptor is used at the image part of an isolated 1 line, and the saturation area of the light discharge characteristic or the developing γ characteristic of the photoreceptor is used at the image part at the time of (n) lines (n>=2).

公开(公告)号：JP2001134027A

公开(公告)日：2001-05-18

申请号：JP2000142663

申请日：2000-05-16

Applicant: SHARP KK

Inventor： IWAMATSU TADASHI ,  TOYOSHIMA TETSURO ,  AZUMA NOBUYUKI ,  MUTO YOSHINORI ,  NAKAJIMA YOSHINORI

IPC: B41J2/44 ,  G03G5/047 ,  G03G9/08 ,  G03G15/00 ,  G03G15/04 ,  G03G15/043 ,  G03G15/32 ,  H04N1/29

Abstract: PROBLEM TO BE SOLVED: To provide a high-quality image forming device capable of faithfully reproducing a high-resolution image pattern over 600 to 1200 DpI. SOLUTION: In this image forming device, the diameter W of the peak intensity 1/e2 of an exposing beam used in an exposure device is twice or less times as large as (p), the value of a latent image spatial frequency characteristic function MTFltnt defined by the film thickness (1) of the photoreceptor and the dielectric constant εa of the photoreceptor, the thickness (m) of a developer layer and the dielectric constant εb of the developer layer and spatial frequency ωdefined by ω=ρ/p is >=0.3.