Seiko Epson Corporation

Shuji Otsuka

Toshifumi Asanuma

Tadashi Kiyuna

Toru Matsuyama

Hidenori Usuda

Seiichi Taniguchi

Isao Nomura

Hideo Taki

Fumitaka Sugimoto

Kazumi Aruga

A method for warning an abnormality of a target object by using a self-organizing map prescribed by a plurality of nodes indicating a normal state of the target object includes acquiring detection data indicating a state of the target object, performing learning of the self-organizing map by using the detection data indicating a distance between a feature value and a node smaller than an abnormality threshold value predefined, storing the detection data indicating the distance larger than the abnormality threshold value in a storage unit as recorded data, and performing notification of the abnormality of the target object when the number of pieces of the recorded data stored in the storage unit reaches a predetermined number.

Abnormality warning method and abnormality warning system

A detecting device is configured to detect a discharge state of droplets from a discharging head configured to discharge droplets onto a medium. A detecting device includes an irradiation unit configured to irradiate the medium on which a predetermined pattern is recorded with the droplets with irradiation light, and to scan the medium with the irradiation light in a scanning direction, a light-receiving unit configured to receive reflected light which is the irradiation light reflected by the medium, and to output a signal indicating intensity of the reflected light, and a control unit configured to perform determination process for determining a discharge state of the droplets onto the medium by using intensity change of the reflected light in scanning the predetermined pattern in the scanning direction.

Detecting device, droplet discharging device, and detecting method

An optical scanning device includes a reflected-light passing unit having a passing region through which a portion of reflected light that is the scanning light reflected by the medium passes. An outer peripheral contour line of the passing region includes a contour curve configured with a set of points where coordinates in a direction orthogonal to a scanning direction are uniquely determined for the coordinates in the scanning direction. The contour curve renders a curve protruded toward the passing region. When a region in contact with the contour curve in the passing region is divided into a plurality of quadrilateral minute regions having equivalent areas and extending from the contour curve to a predetermined coordinate position in the scanning direction and are continuously arranged in the orthogonal direction, widths of the minute regions in the scanning direction are different for each location in the orthogonal direction.

Optical scanning device, transport device, feature detection device, medium determination device, sorting device, and medium scanning method

A medium speed detection device includes a radiation optical system that radiates non-coherent light to a sheet-shaped medium which is being transported, a linear light reception optical system that includes n light reception units (where n is an integer equal to or greater than 2) receiving diffused/reflected light of the non-coherent light from the medium through light reception surfaces and in which the n light reception surfaces are arranged on an imaginary straight line in a transport direction of the medium, and a speed detection unit that obtains a speed of the medium based on a delay time obtained from a temporal correlation between an output of preceding light reception units with preceding light reception surfaces disposed on an upstream side in the transport direction and an output of following light reception units with following light reception surfaces disposed on a downstream side among the n light reception units.

Medium speed detection device and printing apparatus

Disclosed is a recording apparatus including a recording head that performs recording with respect to a medium at a prescribed distance, a contact section that is capable of being in contact with the medium, a carriage that changes a relative location between the medium and the contact section, and an ultrasonic sensor that is capable of sensing an ultrasonic wave which is generated in a case where the medium is in contact with the contact section. The carriage changes the relative location such that a relative velocity between the medium and the contact section is over a prescribed value (transport velocity of the medium), and the ultrasonic sensor is capable of detecting a state of the medium by sensing the ultrasonic wave.

Detection device and recording apparatus

A medium texture detection device includes: a radiation optical system that radiates non-coherent light to a sheet-shaped medium which is being transported; and a light reception optical system that receives diffused/reflected light of the non-coherent light from the medium. A surface of the medium has a basic structure for making a change in an intensity of the diffused/reflected light according to a position of the medium in a transport direction of the medium. A visual field of the light reception optical system is set to be equal to or greater than 1/10 times and equal to or less than 4 times of a size of the basic structure.

Medium texture detection device

In a capacitive load drive circuit, a first driving signal generator generates a first driving signal from a first control signal according to a characteristic of a first capacitive load, and a second driving signal generator generates a second driving signal from a second control signal according to a characteristic of a second capacitive load. A control signal supply portion supplies a common control signal to the first driving signal generator and the second driving signal generator. The first driving signal generator corrects the common control signal to generate the first control signal, and the second driving signal generator corrects the common control signal to generate the second control signal.

Liquid discharging apparatus

A drive signal generator includes a drive signal generator that generates a drive signal for driving a capacitive load. In the drive signal generator, a set of a first MOSFET and a second MOSFET which are electrically connected in series between a wire of a high potential and a wire of a low potential is arranged in plurality in series. A part or all of the first MOSFETs and the second MOSFETs in the plurality of sets have different sizes from each other.

Driving circuit for driving a piezoelectric element

A driving circuit for driving a capacitive load includes: an original drive signal generator that generates a plurality of original drive signals which includes a first original drive signal and a second original drive signal; a selection section that is capable of selecting one original drive signal from the plurality of original drive signals which includes the first original drive signal and the second original drive signal; a driver that generates a drive signal of voltages in accordance with the one original drive signal.

Driving circuit for driving a capacitive load

A capacitive load driving circuit for repeating between charging and discharging for a capacitive load includes a charge supply source, a first signal path through which a first voltage is applied by the charge supply source, a second signal path through which a second voltage higher than the first voltage is applied by the charge supply source, and a connection path selector configured to electrically connect the capacitive load and the charge supply source via at least one of the first signal path and the second signal path, in accordance with a control signal. The charge supply source is arranged and configured to supply voltage to the connection path selection section.

Capacitive load driving circuit

A medium transporting state detecting device includes an irradiation optical system which irradiates a sheet-shaped medium with non-coherent light, a light receiving optical system which receives diffuse reflected light from the medium, a diffuse reflected light acquisition unit which acquires an intensity of the diffuse reflected light for each constant period;, a frequency component analyzing unit which performs analyzing a frequency component of reflected light intensity arrays where the intensity is temporally and sequentially shifted, a period calculating unit which obtains an actual period of a temporal change in a real number portion of a frequency component of a specified frequency among the analyzed frequency components, and a velocity detecting unit which obtains at least one of a difference between an actual velocity and a target velocity and the actual velocity based on the actual period and the target period.

Medium transporting state detecting device and printing apparatus

A liquid discharge apparatus includes: a piezoelectric element that is displaced according to a voltage of a drive signal; a cavity which is filled with a liquid and of which an inside volume is changed due to the displacement of the piezoelectric element; a nozzle that communicates with the cavity and is capable of discharging the liquid; a charge source that supplies a charge to the piezoelectric element; and a connection path selecting section that causes the piezoelectric element and the charge source to be electrically connected to each other by using a first signal path or a second signal path. The charge source includes: a first auxiliary power source that outputs two types or more of voltages; and a second auxiliary power source that outputs three types or more of voltages by using the two types or more of voltages output from the first auxiliary power source.

Driving circuit for driving a capacitive load, and control method of a driving circuit for driving a capacitive load

A liquid discharge apparatus includes an actuator element configured and arranged to receive a drive signal to discharge a liquid, the liquid being an ink including 0.1 wt % to 10 wt % of a polar solvent. The waveform of the drive signal supplied to the actuator element includes a non-rectangular shaped pulse with a ripple being formed in a falling portion of the non-rectangular shaped pulse.

Liquid discharge apparatus and method of discharging liquid

A liquid discharge apparatus includes a piezoelectric element in which a drive signal is applied and which is displaced to eject a liquid; a zeroth wire of a zeroth potential; a first wire of a first potential that is higher than the zeroth potential; a second wire of a second potential that is higher than the first potential; and a connection path selecting section that electrically connects one end of the piezoelectric element to the zeroth wire, the first wire, or the second wire in response to a voltage of a source drive signal that controls the voltage of the drive signal and a hold voltage of the piezoelectric element. Here, a first potential difference from the zeroth potential to the first potential is different from a second potential difference from the first potential to the second potential.

Liquid discharge apparatus and control method of liquid discharge apparatus

A liquid discharge apparatus includes: an original drive signal generator that generates a plurality of original drive signals which includes a first original drive signal and a second original drive signal; a selection section that is capable of selecting one original drive signal from the plurality of original drive signals which includes the first original drive signal and the second original drive signal; a driver that generates a drive signal of voltages in accordance with the one original drive signal; a piezoelectric element that is displaced according to the drive signal; a cavity of which an inside volume is changed due to the displacement of the piezoelectric element; and a nozzle that is provided to discharge a liquid in the cavity according to the change of the inside volume of the cavity.

Growing community of inventors

Shiojiri, Japan

Shuji Otsuka