公开(公告)号：JP2000351237A

公开(公告)日：2000-12-19

申请号：JP16572399

申请日：1999-06-11

Applicant: SHARP KK

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

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

Abstract: PROBLEM TO BE SOLVED: To improve the image reproducibility of both of a cycle line pattern and an isolated dot pattern without reducing the thickness of a photosensitive body even case of high resolution. SOLUTION: When exposure energy density applied when image data is a line pattern every other line is set to Eline (μJ/cm2), the exposure energy control part of an image forming apparatus controls exposure energy density Edot (μJ/cm2) applied when image data is one isolated dot pattern so as to satisfy the relation of the formula -0.11P+6.4

公开(公告)号：JPH1184834A

公开(公告)日：1999-03-30

申请号：JP23878497

申请日：1997-09-04

Applicant: SHARP KK

Inventor： SAKAI KOJI ,  ISHII HIROSHI ,  TOYOSHIMA TETSURO ,  TATSUMI HIROSHI ,  TAKATANI TOSHIHIKO

IPC: G03G15/06 ,  G03G15/08

Abstract: PROBLEM TO BE SOLVED: To prevent the occurrence of toner scattering at the start and finish of forming an image in the case of developing by one-component toner. SOLUTION: A developing roller 41 for carrying the one-component toner 10 so that it may come into contact with a photoreceptor 1 by which an electrostatic latent image is carried is rotatably installed in a developing tank 40 for storing the one- component toner 10. First, the toner 10 is supplied to a supply roller 42, next, the developing roller 41 passes by a control member 43 which is brought into press contact with the developing roller 41 so as to control the toner quantity, then, the toner 10 is carried into a developing area where the developing roller 41 comes into contact with the photoreceptor 1 while keeping a fixed toner layer thickness, then, the image is developed. In order to develop the image, a developing bias voltage Va is supplied, and a control voltage Vb for keeping the layer thickness of the toner 10 constant is supplied to the control member 43, and a supply voltage Vc is supplied to the supply roller 42 for controlling the supply of the toner 10, respectively, and each supply of the developing bias voltage Va, the control voltage Vb and the supply voltage Vc is controlled before rotating the developing roller 41. And, each supply of the developing bias voltage Va or the like, is stopped after stopping the developing roller 41.

公开(公告)号：JPH1152721A

公开(公告)日：1999-02-26

申请号：JP21462197

申请日：1997-08-08

Applicant: SHARP KK

Inventor： ISHII HIROSHI ,  KIDO EIICHI ,  TOYOSHIMA TETSURO ,  SAKAI KOJI ,  IWAMATSU TADASHI ,  TATSUMI HIROSHI

IPC: G03G15/08

Abstract: PROBLEM TO BE SOLVED: To provide a developing device capable of absorbing vibration energy by a layer thickness control member, and restraining vibration on the layer thickness control member to obtain a uniform toner layer thereby forming a good image. SOLUTION: In this developing device having a toner carrier 1 moving toner 2 to a developing position, the layer thickness control means 5 whose surface of a leading end part or the vicinity of the leading end part is brought into contact with the carrier 1 and which forms the toner layer having a specified layer thickness on the carrier 1, and a supplying means supplying one-component toner to the carrier 1; at least one part of the means 5 or the entire means 5 is constituted of a (damping effect) member absorbing the vibration energy. The member 5 absorbs the vibration energy, the vibration of the member 5 can be restrained, and the uniform toner layer can be obtained, so that the good image can be formed. The member 5 can be constituted by combining a member (forming member) for forming the toner layer with a member (damping member) for absorbing the vibration energy.

公开(公告)号：JPH10133473A

公开(公告)日：1998-05-22

申请号：JP29053096

申请日：1996-10-31

Applicant: SHARP KK

Inventor： TOYOSHIMA TETSURO ,  AZUMA NOBUYUKI ,  YAMANAKA TAKAYUKI

IPC: G03G15/08

Abstract: PROBLEM TO BE SOLVED: To simultaneously reduce a stress laid on toner and member stress, and to improve the uniformity of toner layer in the shaft direction of a developing roller and the static charge uniformity of the toner. SOLUTION: In this developing device, a circular-arc spring 5 is arranged so as to place the circular-arc part 5a in the downstream side in the rotary direction of the developing roller 3 from a butting point Q of the circular-arc spring 5 and the developing roller 3, and so as to make an open space X, formed on the upstream side in the rotary direction of the developing roller 3 between two open spaces X and Y formed between the circular-arc spring 5 and the developing roller 3 larger than the open space on the downstream side. By arbitrarily setting the shape parameter of the circular-arc spring 5, various kind of circular-arc spring 5 can be easily obtained. As a result, up to a design of the circular-arc spring 5 for instance, the stress laid on the toner and the member stress can be easily reduced.

公开(公告)号：JPH05313091A

公开(公告)日：1993-11-26

申请号：JP14338192

申请日：1992-05-07

Applicant: SHARP KK

Inventor： TOYOSHIMA TETSURO

IPC: G02B26/10

Abstract: PURPOSE:To eliminate aberration in an image forming point of diffracted light on the scanning surface without spoiling downsizing and weight reduction of a hologram scanner. CONSTITUTION:Regenerated light L1 being collimator light emitted from an unillustrated light source is made incident on a hologram 21 on a hologram disk 20 through a front end hologram 10. This regenerated light L1 is diffracted/ deflected by means of the hologram 21, and is made incident on the scanning surface 40 as diffracted light L2 through a rear end hologram 30. When the hologram disk 20 is rotated in the arrow direction, a deflection angle of the diffracted light L2 changes according to this, and as a result, the diffracted light L2 on the scanning surface 40 moves in the arrow direction, so that main scanning can be carried out. Since convergent power of the front end hologram 10, the hologram 21 and the rear end hologram 30 are set respectively in protrusion, recess and protrusion, a pupil area of the regenerated light L1 incident on the hologram 21 is decreased, on the other hand, aberration in an image forming point of the diffracted light L2 on the scanning surface 40 is also reduced.

公开(公告)号：JPH05249403A

公开(公告)日：1993-09-28

申请号：JP4886492

申请日：1992-03-05

Applicant: SHARP KK

Inventor： IWAMATSU TADASHI ,  TOYOSHIMA TETSURO

IPC: G02B26/10

Abstract: PURPOSE:To maintain the light beam imaging characteristics, curvature performance, and constant speed of the light beam scanning device, which uses holograms, with high precision even if the wavelength of a light source varies, to improve the reliability, and to reduce the cost. CONSTITUTION:This device has the front hologram 2, a rotary hologram disk 1, and the rear hologram 3. On the disk surface of the rotary hologram disk 1, the holograms 6 are arranged in its peripheral direction. Further, the diffraction direction of 1st diffracted light 12 diffracted by the front hologram 2 and the diffraction direction of 2nd diffracted light 13 diffracted by the holograms 6 are opposite to each other on the scanned meridional surface in the image plane of a photosensitive body drum 9 as a scanned surface, and the diffraction direction of the rear hologram 3 is the same as the diffraction direction wherein the spatial frequencies of the front hologram 2 and rotary hologram 1 are lower.

公开(公告)号：JPH05203892A

公开(公告)日：1993-08-13

申请号：JP1141792

申请日：1992-01-24

Applicant: SHARP KK

Inventor： TOYOSHIMA TETSURO ,  IWAMATSU TADASHI

IPC: G02B26/10

Abstract: PURPOSE:To provide the light beam scanning device which compensates aberrations and speed uniformity of a scanning beam effectively only by holograms without using any expensive image formation system lens. CONSTITUTION:This light beam scanning device which consists of a semiconductor laser and >=2 holograms has a holograms 5 for generating a diffracted wave 7 on the disk surface of a rotary hologram 2 where the calibrated light 4 from the semiconductor laser is made incident. Further, the hologram 5 is installed behind the rotary hologram disk 2 and a diffracted wave 8 generated by the hologram 5 is converged on an image formation point 10 on a photosensitive drum 9. The image formation point 10 moves on the photosensitive drum 9 as the rotary hologram disk 2 rotates. The holograms 5 have concave power and the hologram 3 has convex power. This mixed system effectively compensates the aberrations and speed uniformity of the scanning beam.

公开(公告)号：JPH02120734A

公开(公告)日：1990-05-08

申请号：JP27408788

申请日：1988-10-28

Applicant: SHARP KK

Inventor： TOYOSHIMA TETSURO ,  ISHII HIROSHI

IPC: G03G15/04 ,  G03B27/54 ,  H04N1/04

Abstract: PURPOSE:To enhance the light condensing effect of an illuminator and to miniaturize the illuminator by arranging a reflecting mirror in a specific position and providing a reflecting film on the specific part of a light source. CONSTITUTION:The title illuminator is arranged below an original platen 5 and composed of the light source 2 consisting of a light emitting part 1 and a glass tube 9 communicating with the part 1, and the reflecting mirror 3. It is arranged in such a manner that a straight line L connecting the one end A and the other end B passes the light emitting center of the light emitting part 1, so that light 4b reflected by the mirror 3 makes a minimum angle thetaincident on the platen 5. Moreover, a reflecting film 10 is provided on the tube wall 11 of the tube 9 to reflect light 4a emitted above the straight line L toward the mirror 3. It can be formed by depositing Al in the area enclosed with a straight line CD above the tube wall 11 and a straight line CB.

公开(公告)号：JPH01101165A

公开(公告)日：1989-04-19

申请号：JP25899787

申请日：1987-10-14

Applicant: SHARP KK

Inventor： TOYOSHIMA TETSURO ,  NAKAI TOSHIHARU ,  ASAI SHIGEMI

IPC: B41J2/32 ,  H04N1/23

Abstract: PURPOSE:To prevent peeling-off and cracking of an electrode after thick-film baking and substrate splitting by forming a substrate for forming a thick-film electrode with aluminum nitride ceramics. CONSTITUTION:A recording head 1, which presses its tip side to a platen 3 via an ink film 2, has a substrate 5, electrodes 6, and a insulation film 7. The substrate 5 is made of a plate-like aluminum nitride ceramics, the electrodes 6 are thick films formed by printing tungsten paste on the substrate 5 in a given pattern and baking it. Aluminum nitride ceramics for the substrate has low hardness and wears out just as the electrodes of metal (e.g., tungsten) do, therefore no step is formed at the tip of the recording head. Since the ceramics has almost the same linear expansion coefficiency as tungsten, warp or stress scarcely occurs when the electrodes are baked on the substrate. Because of its large thermal conductivity, heat generated by an ink film is not stored in the substrate. Because of a large bending strength, the strength of the substrate is increased.

公开(公告)号：JPS63302055A

公开(公告)日：1988-12-08

申请号：JP13846687

申请日：1987-06-02

Applicant: SHARP KK

Inventor： FURUKAWA MASANOBU ,  ISHII HIROSHI ,  ASAI SHIGEMI ,  TOYOSHIMA TETSURO

IPC: B41J2/045 ,  B41J2/055 ,  B41J2/14 ,  G06K15/10

Abstract: PURPOSE:To make ink discharging speeds from respective orifices constant regardless of the dispersion in the length of piezoelectric bodies, the warpage of a head, and the like, by a method wherein, the displacement of the piezoelectric body is transmitted to a shaft through viscosity of a liquid, and an ink is discharged due to the excitation of a diaphragm. CONSTITUTION:When a hollow and cylindrical piezoelectric body 20 is extended, a liquid 21 sealed with a seal 22 in the vicinity of an inner surface 25 moves in the direction of an arrow by being pulled by the hollow and cylindrical piezoelectric body 20. A frictional force acts on the surface of a shaft 26 opposed to the inner surface 25, whereby the shaft 26 which is set to a head carriage 23 through a spring 27 and abutted on a diaphragm 28 excites a diaphragm 28. Since the liquid 21 consisted of silicon grease, etc., has a remarkably high viscosity, the piezoelectric body 20 the shaft 26 vibrate and displace at approximately 1:1 correspondence. Thus, the shaft can be depressed down against the diaphragm by a uniform force, and ink drips can be discharged from respective orifices at a constant speed.