Sharp Kabushiki Kaisha Corporation

Satoshi Murakami

Yuhi Yui

Kazumasa Tonami

Masahiko Aiba

Eiichi Kido

Shigeyuki Wakada

Soichi Iwamura

Manabu Itoh

Tokio Awata

Toshihide Ohgoshi

Naoki Koide

Takahiro Kawakami

Kouji Mori

Yuriko Kamei

Toshihiro Ota

Ken-ichi Morimoto

Tadashi Itsumi

Ichirou Konno

Keniti Morimoto

Kouichi Moriyama

Masakazu Ishikawa

A sheet transporting device including: a sheet feeding section that feeds plural sheets to a transporting path; three or more roller pairs that are arranged along the transporting path; a double feed detecting section that detects a length of a double feed portion when sheets are fed in an overlapped manner; a selecting section that selects two of the three or more roller pairs based on the length of the double feed portion; and a transport control section that can change a transporting speed of at least one of the selected roller pairs, wherein the selecting section selects two roller pairs that have a space between which the double feed portion can be positioned, and the transport control section controls the transporting speeds of the selected roller pairs such that the speeds differ from each other to separate the delaying sheet from the preceding sheet.

Sheet transporting device, and automatic document feeder and image forming apparatus provided with the same

A sheet transporting device including: a sheet feeding section that feeds sheets to a transporting path; a pair of upstream transporting rollers and a pair of downstream transporting rollers arranged with a predetermined space; a double feed detecting section that detects a length of a double feed portion; a determining section that determines whether the length of the double feed portion is shorter than the predetermined space or not; and a transport control section that controls the drives of the upstream transporting rollers and the downstream transporting rollers, wherein the transport control section controls speeds of the upstream transporting rollers and the downstream transporting rollers so as to separate the delaying sheet from the preceding sheet of the overlapped sheets, in a case where the determining section determines that the length of the double feed portion is shorter than the predetermined space.

A main controlling portion controls each portion of a facsimile system, and when a communication controlling portion receives facsimile communication information from a sender indicated by predetermined sender information stored in a storing portion, causes a LAN controlling portion to notify a notify party indicated by notify party information associated with the received sender information of notification information only when determining that a predetermined notification condition is satisfied. It is possible to notify of the notification information only when the predetermined notification condition desired by a user is satisfied, and it is possible to increase convenience. Moreover, consequently, the facsimile system does not execute an operation process of notifying of the notification information when the predetermined condition is not satisfied, so that it is possible to prevent a wasteful operation process.

Facsimile system

For input image data (`A`) before conversion, each pixel is converted into N (=3) parts. In this case, the three sub-pixels of data corresponding to a recording pixel (black pixel) are converted into recording sub-pixels on both sides of the three (`B`). This eliminates the density variation within a single pixel. Therefore, it is possible to reduce the dot spacing at slanted area, for example, and hence eliminate jaggies, providing a reproduced image easily recognized.

Image forming apparatus

A novel laser printer is disclosed, in which heat generating parts are positively cooled while reducing the noise generated by a blowing mechanism. A rotor of the motor for rotating a scanning mirror of a scanning device is surrounded by a cover. An air flow inlet port and an air flow outlet port are formed on the sides of the cover. The space in the proximity of the air flow inlet port and the air flow outlet port is divided by an air flow separation member. One longitudinal end of the air flow separation member is close to the rotor and the other longitudinal end and the lateral ends thereof are connected to the cover. The air flow separation member partially divides the rotating air flow generated around the rotor in the proximity of the air flow outlet port, and generates the discharge air flow, which in turn is discharged out of the cover. A suction air flow is introduced from the air flow inlet port to the interior of the cover which is now negative in pressure, in the form of the rotating air flow.

Laser printer capable of cooling heat generating parts as well as

A developing device attachable to and detachable from a printer using a non-magnetic monocomponent developer. Two different voltages are applied respectively to a developing roller and a toner layer thickness regulating device from a power source of the apparatus main body side through a terminal and a contacting spring. A voltage is applied directly to the developing roller from the contacting spring whereas a Zener diode is provided in a path connecting the contacting spring and toner layer thickness regulating device to apply another voltage to the toner layer thickness regulating device. The voltage applied to the toner layer thickness regulating device is dropped below the power supply voltage by the Zener voltage when a low-printing-ratio image is produced. Thus, the number of the terminals connecting the apparatus main body and developing device is reduced to one. Accordingly, defective connections at the contacting portions of the terminal can be prevented and the manufacturing costs can be reduced while a satisfactory image is produced.

Detachable developing device for providing first and second voltages for

A digital VTR using Automatic Track Finding (ATF) of a four frequency pilot signal system, employing a multiple segment recording system for high density recording and wide band recording. In a recording mode, a segment code signal is recorded on each track in response to a frame synchronizing signal. In a reproduction mode, the phase difference between the reproduced segment code signal and the frame synchronizing signal is detected by phase comparing circuit 26. The rotation speed of capstan motor 29 is controlled so that the phase relation of one signal in the reproduction mode becomes the same as that in the recording mode. As a result, it is possible to reproduce a stable video in the VTR using the segment recording system.

Magnetic recording/reproducing apparatus using segment recording system

An image recording apparatus which is capable of recording an image by forming a dot for each pixel includes an interface (14) for receiving dot data having 300 dpi dot density, converting unit (15, 16, 17, 18) connected to the interface for converting the received data into dot data having 600 dpi dot density by replacing a dot of a focus pixel with a plurality of dots having patterns corresponding to dot patterns of areas containing the focus pixel, and a base engine unit (13) connected to the converting unit for forming an image in accordance with the converted dot data.

Image recording apparatus for providing high quality image

An improved jitter detecting method and an apparatus thereof, for detecting jitter generated in a reproduced video signal of a VTR or video disc wherein a frequency-modulated carrier of a video signal is recorded by synchronizing the leading edge of a sync signal with the phase of the forefront carrier of a constant frequency carrier train corresponding to a sync tip for every horizontal period at the time of frequency-modulation. From the reproduced frequency-modulated carrier, the phase-reset constant frequency carrier train is utilized as a reference burst signal, thereby to be capable of removing a time-base error by detecting a specific zero-crossing timing of the carrier burst through a bandpass filter based on the trailing edge of a frequency-modulated sync signal during reproduction.

Circuit for detecting and compensating for jitter produced by a

In a method for multiplexing the transmission of audio and video signals, the video signal is separated into a luminance signal and a chrominance signal. The luminance signal is then modulated, and the chrominance signal is balanced-modulated with a low-frequency carrier. The chrominance signal is then converted to a lower frequency. The audio signal, frequency-modulated luminance signal and frequency-converted chrominance signal and frequency-converted chrominance signal are multiplexed by frequency division to be transmitted across telephone cable. Consequently, in comparison with the conventional transmission method which executes direct frequency modulation of the video signal, the band-width of the frequency-modulated luminance signal becomes narrower to eventually facilitate multichannel transmission. The harmful influence from interference from external radio waves or from metallic members used to fix the cable is removed on the receiver side. Accordingly, satisfactory picture transmission can be performed without the necessity of any additional coaxial cable for video signal transmission.

Growing community of inventors

Yamatokoriyama, Japan

Satoshi Murakami