Mita Industrial Co., Ltd.

Panasonic Intellectual Property Management Co., Ltd.

Takashi Terada

Hiroyuki Hazama

Masaru Watanabe

Nariaki Tanaka

Hirotsugu Ogawa

Mitsuji Tsujita

Takuji Terada

Eiichi Miyamoto

Hiroyuki Hamakawa

Takashi Yamamoto

Takahiko Murata

Masanobu Maeshima

Yuji Tanaka

Masahiko Maeda

Shinji Fukuda

Kazuhiro Mizude

Hideo Nakamori

Ichiro Yamazato

Katsumi Nakagawa

Masao Uyama

Tomohiro Tsutano

Masayuki Ishii

Ken Ohbuchi

Toshinori Komesu

Masaru Gotoh

Nobuhiro Nakajima

Kouji Yoshida

Toru Ueno

Yuya Kuroki

Kenji Ichikawa

Aiichirou Kuwayama

An imaging apparatus includes a camera which images a person, a first sensor which outputs a first signal according to infrared light, a second sensor which outputs a second signal according to infrared light, and controller which starts imaging the person by the camera based on magnitudes of the first signal and the second signal. An infrared light detection area of the first sensor is far from an entrance of a building in comparison with an infrared light detection area of the second sensor, and the infrared light detection area of the second sensor is close to the entrance of the building in comparison with the infrared light detection area of the first sensor.

Surveillance door monitor apparatus and method with IR sensors and wrong-way entry detection

A radio communication apparatus and transmission power control method are disclosed, which can maintain communication with handsets while avoiding an increase in radio interference to another radio communication system as much as possible when radio communication is performed with one or more handsets. The handset transmits a communication start request signal to a base unit. Upon verifying the reception of the communication start request, the base unit measures the RSSI level of the communication start request signal transmitted from the handset, determines a transmission power value based on a power control table that has been updated with the measured RSSI level, and controls the transmission power of a control signal transmitted to the handset.

Radio communication apparatus and transmission power control method

A charging device is provided which is suitable for use in a compact electrophotographic image forming apparatus. The charging device includes: a pair of support members spaced a predetermined distance; and a discharge wire stretched between the pair of support members with one end thereof being fixed to one of the support members and with a middle portion thereof being supported by the other support member. One end of a coil spring is connected to the other end of the discharge wire, and the other end of the coil spring is received by a hooking portion of an electrode. The electrode is fixed in the vicinity of one of the support members.

Charging device having a charger arrangement frame in which a discharge

An image-forming machine includes a photosensitive drum rotatably disposed; a charger for electrically charging the peripheral surface of the photosensitive drum to a predetermined polarity; a developer for developing an electrostatic latent image formed on the peripheral surface of the photosensitive drum into a toner image; a transfer device for transferring the toner image formed on the peripheral surface of the photosensitive drum onto a transfer paper; a fixing roller for heat-fixing the toner image transferred onto the transfer paper by the transfer device; and a cooling fan for blowing cooling air to the surrounding area of the fixing roller. A guide plate having a plurality of openings formed along its length, guides the transfer paper onto which the toner image has been transferred by the transfer device, to the fixing roller.

Image-forming device and a process unit therefor having a guide plate

A transferring device in which a transfer roller having a diameter which is not less than 60% of the diameter of an organic photosensitive drum with a diameter of 10 to 20 mm is arranged with a clearance provided between the transfer roller and the organic photosensitive drum. The transferring device avoids problems such as current leakage and reverse transfer of toner in the case of miniaturization of an image forming apparatus or contamination of the transfer roller, and easily sets a transfer current because an effective transfer current width is large.

Transferring device and image forming apparatus using the same

An image-forming machine including a photosensitive drum which is rotatably disposed and successively passes through a charging zone, a developing zone and a transfer zone; a charger for charging the peripheral surface of the photosensitive drum into a predetermined polarity; a developing device for developing an electrostatic latent image formed on the peripheral surface of the photosensitive drum into a toner image; a transfer means for transferring the toner image formed on the peripheral surface of the photosensitive drum onto a transfer paper; and a foreign matter-recovering means which is disposed between the transfer zone and the charging zone and comes into contact with the peripheral surface of the photosensitive drum, and removes foreign matter adhered onto the peripheral surface of the photosensitive drum, the foreign matter-recovering means having a foreign matter-recovering brush brought into contact with the peripheral surface of the photosensitive drum, an elastic holding member made of an elastic material mounting said foreign matter-recovering brush, and a brush-support member for supporting said elastic holding member, and the foreign matter-recovering brush being press-contacted to the peripheral surface of the photosensitive drum by the compressive elastic force of the elastic holding member.

Image-forming machine

A process unit including a photoconductor unit having a photoconductor drum, a developing unit having a developing roller disposed in a development housing, and a support shaft means for supporting the developing unit pivotably relative to the photoconductor unit. The developing roller is disposed such that its surface is pressed against the surface of the photoconductor drum in a developing zone. The photoconductor drum and the developing roller are rotationally driven such that their respective surfaces move from below to above in the developing zone.

Process unit

According to the present invention, in the image forming apparatus in which so-called 'cleaningless' is realized, no problems such as traces of paper powder, gray or foggy stripes and the like occur in a formed image. The image forming apparatus is provided with a brush for scratching toner remaining on the surface of the photosensitive drum and recovering paper powder adhering on the surface thereof. When the length of the brush extending from the root thereof to the photosensitive drum is taken as a�mm!, the length of the toughening member, toughening the brush materials, projecting from the root of the brush materials is taken as c�mm!, and the length of the portion of the brush, cutting into the photosensitive drum, is taken as b�mm!, the relationship among a�mm!, b�mm! and c�mm! satisfies the conditions that 0.3.ltoreq.(c/(a+b)).ltoreq.0.95, 0.1 �mm!.ltoreq.b.ltoreq.1.5 �mm!, and (a+b)&lt;2 �mm!.

Image forming apparatus having a toner brush equipped with a toughening

An image-forming apparatus for forming image through the electric charging of a photosensitive material drum, exposure to light, developing and transfer, wherein a developing device also works to clean the toner remaining on the photosensitive material; an electric charge for effecting the electric charging has a scorotron charger located within .+-.45.degree. from a perpendicular downwardly drawn from the center of the photosensitive material drum, and has a hole on the side opposite to the opening for charging; and an electric field E.sub.1 between a wire and a grid in the scorotron charger is set to be stronger than an electric field E.sub.2 between the wire and a shield. The invention is further concerned with an image-forming unit used in the image-forming apparatus for forming image wherein said image-forming unit includes a photosensitive material drum having a photosensitive layer of an organic material, a first frame for supporting the photosensitive material drum maintaining the freedom of rotation, a photosensitive material unit having a scorotron charger which is provided on the first frame so as to be positioned within .+-.45.degree. from a perpendicular downwardly drawn from the center of the photosensitive material drum and has a ventilation hole on the side opposite to the opening for charging, a developing device, and a second frame which supports the developing device and also works as a toner container; wherein the first frame and the second frame have a common fulcrum and a resiliently engaging device on the side opposite to the fulcrum, and an electric field E.sub.1 between a wire and a grid in the scorotron charger is set to be stronger than an electric field E.sub.2 between the wire and a shield.

Image-forming apparatus and image-forming unit

An image forming apparatus including a photoreceptor, an electrically charging unit for evenly electrically charging the photoreceptor to a predetermined potential, a light exposure unit for exposing a surface portion of the evenly electrically charged photoreceptor to light so as to form an electrostatic latent image, a developing unit for causing toner to adhere to the photoreceptor surface portion exposed to light so as to develop the electrostatic latent image into a toner image, and a transferring unit to which a predetermined transferring voltage is applied for transferring the toner image to a sheet. Before the tip end of the toner image reaches the position opposite to the transferring unit but after the tip end of the sheet has reached the position opposite to the transferring unit, the application of the predetermined transferring voltage to the transferring unit is started.

Image forming apparatus having a transferring unit improved in

An electrophotographic method in which an electrostatic latent image on a single-layer organic photosensitive material is developed while applying a developing bias voltage of the same polarity as the polarity of the charge of the photosensitive material. The developing bias voltage is set to be higher than a potential that corresponds to a point where a curve approximating the zone of a large amount of exposure to light and a curve approximating the zone of a small amount of exposure to light in a light decay characteristics curve intersect each other.

Electrophotographic developing method using developing bias voltage

A process unit comprising a photoconductor unit and a developing unit supported pivotably via a support shaft. The photoconductor unit and the developing unit each have a pair of support side walls having support holes formed on the same axis. One pair of the support side walls define a pair of inner support side walls having an outside width smaller than the inside width of the other pair of the support side walls, while the other pair of the support side walls define a pair of outer support side walls. The pair of outer support side walls and the pair of inner support side walls are supported via the support shaft passing through the respective support holes. One end of the support shaft is supported by one of the outer support side walls via a bearing member detachably mounted in the support hole of the one of the outer support side walls.

An image forming apparatus includes a rotatable photosensitive member including a conductive base and a photosensitive layer located on a surface of the base; a charging device located in the vicinity of the photosensitive member for charging the photosensitive layer; a charge removing device located upstream with respect to the charging device in a rotation direction of the photosensitive member for radiating light toward the photosensitive layer prior to charging performed by the charging device to uniformize a surface potential of the photosensitive layer; a light radiation device for radiating light to a charging area of the photosensitive layer in the state of being charged by the charging device and for adjusting the amount of the light to be radiated; an exposing device for radiating light corresponding to an image toward the photosensitive layer in the state of being charged; a developing device located downstream with respect to the exposing device in the rotation direction of the photosensitive member; a change detection device for detecting a change in at least one of a charging potential of the photosensitive layer and a sensitivity of the photosensitive layer; and a compensation device for compensating for the change by adjusting the amount of the light radiated toward the charging area by the light radiation device based on results obtained by the change detection device.

Image forming apparatus capable of changing the surface potential of a

An image forming apparatus includes a charge removing device for removing the residual charge on a photosensitive film. The light emitted from an optical source of the charge removing device is selected from the range between the wavelengths which correspond to half of the maximum absorbance in a light absorbance characteristic of the photosensitive film. Since carrier generation does not occur by the light emitted by the charge removing device, the charging ability and the charge retaining ability of the photosensitive film are improved, and the image quality is significantly improved.

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Osaka, Japan

Takashi Terada