Omron Corporation

Masashi Sugimoto

Yuji Ohashi

Masayuki Tanaka

Hayami Hosokawa

Shinya Sonoda

Junji Hiraishi

Hideki Chujo

Yoshitaka Taishi

Masayuki Murota

Takeshi Arihara

Atsushi Noda

Koji Iesaki

Goki Nishio

Hiroki Tabata

Yujii Ohashi

There is provided a limited-area reflection type optical sensor having an emitted light lens and a reflected light lens. An opposite-light-receiver-side portion opposite to a light receiver side constitutes a first curvature surface having a first curvature while a light-receiver-side portion on the light receiver side with respect to the opposite-light-receiver-side portion constitutes a second curvature surface having a second curvature smaller than the first curvature in the emitted light lens provided in an optical path of the emitted light. An opposite-light-emitter-side portion opposite to a light emitter side constitutes a fourth curvature surface having a fourth curvature while a light-emitter-side portion on the light emitter side with respect to the opposite-light-emitter-side portion constitutes a fifth curvature surface having a fifth curvature smaller than the fourth curvature in the reflected light lens provided in an optical path of the reflected light.

Limited-area reflection type optical sensor and electronic device

An ultrasonic wave that is transmitted from an ultrasonic-wave transmitter is received by an ultrasonic-wave receiver through a sheet A reception signal is input to an extracting unit The extracting unit compares its phase with a phase of a reference signal output from a reference-signal reproduction unit It converts a phase difference therebetween into a signal having a level corresponding to the phase difference. The signal having a level corresponding to the phase difference is compared with a threshold value set in a threshold-value setter by a comparator When one sheet is fed, the comparator produces a signal of high level. When a doubles feeding occurs, it produces a signal of low level.

Sheet detecting device

A conveyance device 4 for conveying a manuscript to an image reading section of a main body mounted by an image processing system is provided with a base member 6 removably fixed to the main body to provide a conveyance path 5, a driving mechanism and a manuscript guide member 8 for driving and conveying the manuscript. The manuscript is located between the manuscript guide member and a rib 9 at a left-hand side, and conveyed in a stable status. On a surface of a top end of a moving member 16 associated with the manuscript guide member is provided a white colored plate 17. A groove portion 18 other than the plate is dark, and the image is read to be binary coded whereby a pixel corresponding to the plate indicates '1'. A position of the plate is located in the guide member or a right hand side edge of the manuscript, and a left hand side edge is fixed by the rib. Accordingly, a manuscript width (read width) Is determined from the pixel '1'.

Automatic judging device about image read width

A paper retainer assembly for attachment to a feed-in mechanism at a paper inlet or a feed-out mechanism at a paper outlet, includes a flexible, linear paper retainer, such as a metal or plastic wire. The paper retainer is operable to be extended to an extended position for use and retracted to a retracted position when not in use. The assembly also includes a locking mechanism operable to maintain the paper retainer in the extended position.

Paper retainer

An image input device photoelectrically reads a document and outputs digital data. This image reader includes a first voltage generating circuit for generating a first voltage for setting an upper limit of contrast, a second voltage generating circuit for generating a second voltage for setting a lower limit of contrast, and an A/D converter for converting an input analog signal to a digital signal in accordance with the first and second voltages. At least one of the voltages generated by the first voltage generating circuit and second voltage generating circuit is variable. Also disclosed is an image reader including a dark voltage memory circuit, storing dark voltages corresponding to color signals R, G and B, a first switching circuit sequentially switching the output of the dark voltage memory circuit and outputting a selected dark voltage, a second switching circuit adapted to synchronously output a selected color signal corresponding to the selected dark voltage, and a differential amplifier subtracting the selected dark voltage from said selected color signal.

Image reader with adjustable contrast range

Growing community of inventors

Osaka, Japan

Masashi Sugimoto