Abstract: In one embodiment, a method of recording an error in a tape drive, comprises receiving, in a tape library controller, an internal identifier associated with a tape cartridge; recording, in a memory medium associated with the tape library controller, the internal identifier; associating, in the memory medium, the internal identifier with an external identifier associated with the tape cartridge; and providing information in the memory medium to identify the tape cartridge in a subsequent error analysis routine.

Abstract: A magnetic recorder for performing at least one of magnetic recording and magnetic reproduction on a running magnetic tape, comprising: a magnetic head mounted so as to slidably abut on the magnetic tape; a subject portion made of the same material as that of the magnetic head and provided so as to slidably abut on the magnetic tape; a tinge detection sensor for detecting a color of a surface of the subject portion slidably abutting on the magnetic tape; and a judgment portion for acquiring a detection signal output from the tinge detection sensor when the color of the surface of the subject portion detected by the tinge detection sensor changes to a specific color.

Abstract: A method of and apparatus for forming servo bursts on a magnetic storage disk are disclosed. The method comprises forming at least one phase-encoded servo burst to a surface of the disk using a printing-process step that writes all parts of the phase-encoded servo burst substantially simultaneously. The phase encoded by the at least one phase-encoded servo burst varies continuously with radial position.

Abstract: A sequential seek method for a hard disc drive, a hard disc drive using the same, and a computer readable recording medium storing a program to execute the same. The method includes calculating a seek length by comparing a cylinder number of a current track with a cylinder number of a target track; checking if the seek length corresponding to a cylinder number is equal to or smaller than 2; calculating a seek length by comparing a position of a head in a current data track with a position of the head in a center line of a target data track if the seek length corresponding to the cylinder number is equal to or smaller than 2; calculating a seek time corresponding to the seek length corresponding to the head position; calculating seek trajectories based on the seek time denoted by a head position and the seek length thereof; and controlling a current being applied to a voice coil motor to move the head along the calculated trajectories calculated.

Abstract: In one example of one aspect of the invention, a tape drive is provided. The tape drive includes a housing configured to receive a storage cartridge, the housing having a take-up reel and a plurality of guide elements disposed therein. The guide elements are configured to guide storage tape from the storage cartridge to the take-up reel along a tape path, the tape path passing adjacent a data transducer head (e.g., a read and/or write head) and wrapping a portion of the take-up reel at a first location and winding onto the take-up reel at a second location. The first location and the second location may be positioned along the tape path between the data transducer head and the take-up reel.

Abstract: The present invention includes a data storage system. The data storage system includes an enclosure and at least one perpendicular recording device positioned within the enclosure and in communication with a recording medium. The recording medium includes a layer of magnetic material that has a permeability that is substantially similar to a permeability of a magnetic material in the recording device. The data storage system also includes a soft magnetic material included in the enclosure for shielding magnetic stray fields from the perpendicular recording device. The soft magnetic material has a permeability that is at least as great as approximately the permeability of the layer of magnetic material of the recording medium.

Abstract: An anti-shock device for a vehicular HDD (hard disk drive) and an assembly method thereof are provided. The device includes: the HDD being a storage medium; a HDD bracket coupled and fixed at its bottom surface with the HDD; a plurality of silicone dampers being damping members for damping an outside vibration shock transmitted to the HDD; a plurality of damper housings for coupling and fixing the silicone dampers to their circumferential surfaces, and preventing free movements of the silicone dampers; a HDD connector for connecting the HDD to the vehicular electronic equipment; and an anti-shock bracket divided and coupled as an upper anti-shock bracket and a lower anti-shock bracket with each other, and supporting the silicone damper and the damper housing.

Abstract: A magnetic disc apparatus has a ramp holding the magnetic head in a position apart from the magnetic disc and a filter case holding a filter in the state of being bent in such a manner that the filter surrounds the ramp together with the magnetic disc. The filter removes dust in airflow which flows in the magnetic disc apparatus accompanying the rotation of the magnetic disc.

Abstract: A disk spacer interposed between a plurality of disks that are rotatably installed on a spindle motor and has a ring shape to maintain an interval between the disks. The center of an inner circle defined by an inner circumferential surface of the disk spacer is not congruous with the center of an outer circle defined by an outer circumferential surface thereof to produce mass eccentricity.

Abstract: The invention provides a disk device used both horizontally and vertically, having a fall-proof mechanism of a disk medium provided at low cost, and capable of reducing noise caused by the fall-proof mechanism. The disk device comprises cuts 123 for forming tongued portions 122, engagement portions 124 formed to portions where the tongued portions 122 overlap when the tongued portions 122 are folded back toward a disk loading recess 121, and engagement receiving portions 125 formed on the tongued portions 122 to be engaged with the engagement portions 124, wherein disk stopper members constituting a fall-proof mechanism of the disk medium are formed by folding back the tongued portions 122 and engaging the engagement portions 124 with the engagement receiving portions 125.

Abstract: A perpendicular magnetic recording head includes: a main pole; a return pole spaced a predetermined gap from the main pole; an induction coil inducing a magnetic field on the main pole; and two or more gap shields, wherein the two or more gap shields are formed in the gap between the main pole and the return pole.

Abstract: A cartridge case is constructed so as to be capable of enclosing an information medium inside a cartridge main body that includes a first shell and a second shell and is formed by placing the first shell and the second shell on one another. Cylindrical convex portions, each of which has a positioning reference hole formed in a central portion thereof, are erected on an inner surface of a main plate of the first shell. Insertion holes that allow positioning pins to be inserted into the positioning reference holes of the cylindrical convex portions are formed in a main plate of the second shell.

Abstract: A HGA includes a slider, a suspension to load the slider, and a particle filter device to fix in leading side of the slider. The particle filter device is made of power material or porous material. The HGA further comprise a micro-actuator to connect with the slider. Because the particle filter device is positioned on the leading edge of the slider that is a passage of the particles, so the particles generating from the components in the disk drive unit, such as the HGA will be catched by the particle filter device. Thus the particles will be prevented from flying on the disk and deposited on ABS of the slider, this will ensure the slider to read from/write to data information to the disk successfully and eliminate a possibility to damage the slider/the disk. A disk drive unit with such an HGA is also disclosed herein.

Abstract: The invention provides a thin film magnetic head which is capable of improving the reliability of a head by preventing an element structure from being contacted with a recording medium during a recording and a reproducing operations and capable of coping with a high recording density while favorably maintaining a low floating distance, and a method of manufacturing the same. The thin film magnetic head includes a slider that floats from a surface of a recording medium by an airflow generated on the surface of the recording medium to be rotated, and a thin film magnetic head element structure that is formed on an air discharging end face of the slider. A thermal plastic deformation portion is provided in the vicinity of the air discharging end face on a back surface of a recording medium facing surface of a slider so that a part of the thin film magnetic head element structure is further spaced from the surface of the recording medium than the recording medium facing surface of the slider.

Abstract: A magnetic head slider suitable for a disk drive measuring 1.8 inches or less in disk size incorporates preventive measures against the decreases in lifting force that occur in small sliders with a slider width of 0.8 mm or less. The present invention improves the inclination margins of the flying slider in a rolling direction at the lowest flying point, and achieves low flying height and stable flying. The slider is constructed with stepped surfaces on the slider's leading-side flying surface formed up of shallow-grooved surfaces and a deep-grooved surface so that a trailing-side width W2 between the stepped surfaces is smaller than a leading-side width W1.

Abstract: Embodiments of the invention provide Femto and below form factor magnetic head slider designs both capable of minimizing reduction of its flying height at high altitude and lower flying height sensitivity on manufacturing process tolerance. In one embodiment, the air bearing surface of a magnetic head slider includes a plurality of inlet rails respectively having inlet rail surfaces, a step bearing surface extending at a predetermined first depth from a reference plane including the inlet and the outlet rail surfaces, a negative surface extending in a plane at a predetermined second depth greater than the first depth from the reference plane, longitudinal carbon islands of a predetermined height formed on the inlet rails, and an outlet rail having an outlet rail surface flush with the inlet rail surfaces and holding a magnetic R/W head. The step bearing surface extends at a predetermined first depth from a reference plane.

Abstract: In a magnetic disk device, a magnetic circuit drives an actuator carrying a magnetic head, so that the magnetic head is moved to a target track on a surface of a magnetic disk. A base has a threaded-hole part to which the magnetic circuit is fastened with a screw. A blocking member is provided to enclose a gap which is formed between the magnetic circuit and the threaded-hole part when the magnetic circuit is fastened to the threaded-hole part.

Abstract: A micro-actuator of the invention includes a support base having two actuator side arms and a rotatable bottom plate positioned between the actuator side arms; wherein at least one of the actuator side arms having a back-turned extension in a first end thereof; a pair of connection elements that connects the rotatable bottom plate to the actuator side arms in a second end thereof, respectively; at least one PZT elements bonded to the actuator side arms in its length and the back-turned extension. The rotatable plate rotates in a first direction when the at least one PZT elements expand, and a second direction when the at least one PZT elements contract. The invention also discloses a HGA and disk drive unit with such a micro-actuator.

Abstract: A magnetic data recording head having reduced thermally induced shield (pole tip) protrusion. The head includes a magnetoresistive sensor sandwiched between first and second shield. The shields have a substantially reduced thickness. The distance between the shields defines a gap (G) and the shields each have a thickness (ST) such that the ratio ST/G is greater than 2, but less than 50. More preferably the ratio ST/G is greater than 2, but less than 20, and yet more preferably, the ratio ST/G is greater than 2 and less than 10.

Abstract: Methods and apparatus are provided for sensing physical parameters. The apparatus comprises a magnetic tunnel junction (MTJ) and a magnetic field source whose magnetic field overlaps the MTJ and whose proximity to the MTJ varies in response to an input to the sensor. The MTJ comprises first and second magnetic electrodes separated by a dielectric configured to permit significant tunneling conduction therebetween. The first magnetic electrode has its spin axis pinned and the second magnetic electrode has its spin axis free. The magnetic field source is oriented closer to the second magnetic electrode than the first magnetic electrode. The overall sensor dynamic range is extended by providing multiple electrically coupled sensors receiving the same input but with different individual response curves and desirably but not essentially formed on the same substrate.

Abstract: Methods and apparatus are provided for sensing physical parameters. The apparatus comprises a magnetic tunnel junction (MTJ) and a magnetic field source whose magnetic field overlaps the MTJ and whose proximity to the MTJ varies in response to an input to the sensor. A magnetic shield is provided at least on a face of the MFS away from the MTJ. The MTJ comprises first and second magnetic electrodes separated by a dielectric configured to permit significant tunneling conduction therebetween. The first magnetic region has its spin axis pinned and the second magnetic electrode has its spin axis free. The magnetic field source is oriented closer to the second magnetic electrode than the first magnetic electrode. The overall sensor dynamic range is extended by providing multiple electrically coupled sensors receiving the same input but with different individual response curves and desirably but not essentially formed on the same substrate.

Abstract: A fast and very low-power-consuming nonvolatile memory. A nonvolatile magnetic memory includes a high-output tunnel magnetoresistive device, in which spin-transfer torque is used for writing. A tunnel magnetoresistive device has a structure such that a ferromagnetic film of a body-centered cubic structure containing Co, Fe, and B, a MgO insulator film of a rock-salt structure oriented in (100), and a ferromagnetic film are stacked.

Abstract: A leakage current measurement circuit measuring a substrate leakage current and a gate leakage current in response to a variation in the size of an MOS transistor and a leakage current comparison circuit judging which one of the substrate leakage current and the gate leakage current is dominant. The leakage current measurement circuit includes a charge supply, a leakage current generator and a detection signal generator. The leakage current comparison circuit includes a charge supply, a leakage current comparator and a detection signal generator.

Abstract: A multi-voltage power supply includes a transformer, a first output circuit to generate a first output voltage using a voltage transferred to a secondary winding of the transformer, and a first output voltage controller to control a voltage supplied to the primary winding of the transformer according to the first output voltage. The multi-voltage power supply includes second through Nth output circuits to generate second through Nth output voltages using the voltage transferred to the secondary winding of the transformer, and second through Nth output voltage controllers performing control in order to linearly output the second through Nth output voltages by feeding back the second through Nth output voltages.

Abstract: An LCDI circuit interrupting device having a detection portion and an interrupting portion coupled to each other with a device that isolates each said portion thus allowing the detection portion to detect electric faults based on a threshold voltage that is independent of the threshold voltage used by the interrupting portion to trip the device.

Abstract: A semiconductor device includes at least a plurality of first interface circuits electrically coupled between first and second power supply lines belonging to a first power supply system, one or more first circuits including a first surge current path coupled to the first power supply line and a second surge current path coupled to the second power supply line, a plurality of second interface circuits electrically coupled between third and fourth power supply lines belonging to a second power supply system independent from the first power supply system, and further electrically coupled to a corresponding interface circuit of the plurality of first interface circuits, respectively, and one or more second circuits including a third surge current path coupled to the first circuit and have a first time constant derived by a first resistance coupled to the third surge current path and a first capacitance.

Abstract: An electronic circuit and method for producing the electronic circuit, where the electronic circuit includes a functional circuit including at least one multigate functional field effect transistor and an ESD protection circuit including at least one multigate ESD protection field effect transistor. The multigate protection field effect transistor is a transistor that is partially depleted of electrical charge carriers, and the trigger voltage of the multigate protection field effect transistor is less than the trigger voltage of the multigate functional field effect transistor.

Abstract: The electrostatic discharge protection circuit prevents internal elements from being damaged due to static electricity. The ESD protection circuit includes a first voltage line connected to a power source voltage pad, a second voltage line connected to a ground voltage pad, an ESD protection unit connected between the first voltage line and the second voltage line to provide a static electricity discharge path, and at least one switch connected between an input/output pad and the ESD protection unit to be switched by static electricity.

Abstract: A power system device-to-device direct communication system comprises a first intelligent electronic device with a processor and a transmit module. Software within the processor maintains a list of “virtual outputs,” which correspond to a number of data channels maintained within the transmit module. The second intelligent electronic device receives the data channels from the first intelligent electronic device and extracts the virtual output bits. The second intelligent electronic device then adjusts a group of its own output contacts in accordance with the received virtual output bits.

Abstract: A stray voltage detection and isolation system. The stray voltage detection portion of the system includes a water delivery system electrically isolated from an electrical transmission system of an electric utility. Meters measure an electrical characteristic between a first test-point that is electrically connected to the water delivery system and a plurality of second test-points. The second test-points are at earth grounds at locations electrically connected to the first test-point. The location of a source of stray voltage can be determined by evaluating differences in the measured electrical characteristics. The stray voltage isolation portion of the system electrically isolates a water delivery system. A controller maintains an air gap between a water source and a first storage tank or between the first storage tank and a second storage tank. The second storage tank provides the electrically isolated water.

Abstract: One embodiment provides a system for protecting at least one component in an integrated circuit (IC). The system includes a disconnect element that is electrically connected in series between a terminal of the IC and the at least one component. The disconnect element is configured to have a first state to permit an electrical signal to propagate from the terminal to the at least one component and a second state corresponding to a high impedance condition that electrically disconnects the terminal relative to the at least one component. A control system is configured to cause the disconnect element to transition from the first state to the second based on at least one predetermined activation condition.

Abstract: A power controller for power sourceing equipment in a distributed power network includes a memory element that indicates a device power down policy to be applied in the event of a main power supply failure and switchover to a backup power supply. A variety of policies are available, at least one of which permits flexible administration of the settings for individual devices by grouping them together. Devices assigned to given groups may be determined to be critical or non-critical and be powered down or remain powered during the power supply switchover event. The power down policy is triggered through a signal that can be hardwired to the controller to indicate when the power supply switchover event occurs. The various policies that can be applied contribute to reducing the switchover latency when non-critical loads are shut down, to reduce the demand on interim power supply devices, such as capacitors.

Abstract: The present invention is to provide a high voltage over-current protection device and a manufacturing method thereof, in which PTC polymers are cross-linked by chemical cross-linking. With the method of the present invention, the high voltage endurance of the PTC devices is enhanced. In addition, the internal stress and degradation of polymers caused by irradiation treatment are prevented.

Abstract: A power failure detection circuit of a switching source includes: a switching element; a control circuit of the switching element, and a photocoupler. The phtocoupler includes a light emitting diode and a phototransistor. The light emitting diode is located at a primary side of a transformer and is serially connected to the control circuit. A cathode of the light emitting diode is connected to a capacitor. The phototransistor for detecting a power failure of an alternating current source is located at a secondary side of the transformer. A charging current flowing into the capacitor is used as a detection current for detecting the power failure of the alternate current source.

Abstract: A protection apparatus is provided that can use a thermal fuse at higher voltage and higher current. The protection apparatus includes a protection circuit connected in series between a power supply and a load. The protection circuit includes a thermal fuse with a predetermined operating temperature, activated in response to sensing overheating of the power supply and/or load, and an electrosensitive fuse connected in parallel with the thermal fuse, and activated at a predetermined operating current. The electrosensitive fuse is adapted to be activated only after the thermal fuse has been activated at the predetermined operating temperature.

Abstract: An object of the present invention is to provide a small surge absorption element that exhibits superior impedance matching even for high-speed signals and a surge absorption circuit. The surge absorption element comprises first and second inductor sections and first and second surge absorption sections. The first inductor section comprises first and second coils and the second inductor section comprises third and fourth coils. By suitably setting the coupling coefficients between the respective coils and the induction coefficients of the first to fourth coils, image impedance with an even frequency characteristic can be implemented over a wide area. Further, because the first to fourth coils have a positive magnetically coupled state with respect to one another, the induction coefficients of the first to fourth coils can be reduced in comparison with a case where the first to fourth coils are not afforded a positive magnetically coupled state.

Abstract: In a composite electrical circuit protection device, thermal coupling between a planar PPTC element and a planar MOV element is controlled by insertion of a thermal mass material for regulating heat transfer from the MOV element to the PPTC element, such that a PPTC resistor hot zone forms consistently away from the planar major foil electrode confronting the MOV thereby regulating heat transfer from the MOV to the PPTC resistor.

Abstract: A demagnetizable electromagnetic door lock is actuated by generating or degenerating magnetic force of an electromagnetic coil. A magnetic field direction driving circuit is electrically connected to the electromagnetic coil. Under the control of a controller, after the magnetic field direction driving circuit is applied to eliminate the residual magnetic force of the electromagnetic coil, the door lock can work smoothly in due course.

Abstract: The invention relates to a dual-coil electromagnetic valve actuator having a permanent magnet and an actuator member (11) movable between two extreme positions under the effect of a resilient member and two electromagnets each comprising a core having a T-shaped first core portion (18) with a base (19) connected to a central branch (20) with a coil (21) disposed thereabout, the first core portion (18) being placed in a U-shaped second core portion (22) having a base (23) connected to outer branches (24) which extend parallel to the central branch (20) of the first core portion (18), a permanent magnet (25) being interposed between the base of the first core portion (18) and the base of the second core portion (22).

Abstract: The invention relates to an electromagnetic valve actuator comprising an actuator member (11, 14) movable under the effect of a resilient member (12, 13) and of at least one coil (20), and at least one permanent magnet (22) arranged to hold the actuator member (11, 14) in at least one of its extreme positions against the resilient member (12, 13) when the coil (20) is not powered, the coil (20) being associated with a core (16) comprising two portions (17) having respective first facets (21) in contact with the permanent magnet (22) and respective second facets (23) that present between them an airgap (e) of size that is much smaller than a thickness (H) of the permanent magnet. According to the invention, the airgap (e) forms an angle with the direction (25) of magnetization of the permanent magnet (22).

Abstract: A current flowing through a measuring target coil increases when a pulse signal is high. A voltage corresponding to instantaneous value of the current through the coil is input to input terminal. A blanking signal generator circuit generates signal which has predetermined pulse width and rises in synchronization with rise of the pulse signal. During period in which this signal is high, first switch becomes ON and first capacitor holds the voltage at the input terminal. A second switch becomes ON when first switch becomes OFF to connect second capacitor to connection node between resistors, and disconnects second capacitor from connection node when the pulse signal becomes low. Second capacitor is charged with voltage corresponding to average value of an amount of increase in the current through the coil. A voltage obtained by adding the voltage charged in first capacitor to this charged voltage is supplied to third capacitor.

Abstract: Nowadays during assembly, foil or adhesive tape is used to protect bearings in passenger door fittings. An assembly protection device for an aircraft component is stated, which assembly protection device comprises a sealing device. In this way the assembly protection device can simply be firmly slid into the component to be protected so that effective sealing during assembly is ensured. Furthermore, the assembly protection device is reusable.

Abstract: A lower movable electrode 35, having line sections 35a, 35a on both ends and a capacitor section 35b in the center, and an upper movable electrode 37, having line sections 37a, 37a on both ends and a capacitor section 37b in the center, are placed so that the capacitor sections 35b, 37b face each other, and drive electrodes of lower-movable-electrode actuators 27a, 27b, 27c, 27d driving the lower movable electrode 35 and upper-movable-electrode actuators 29a, 29b, 29c, 29d driving the upper movable electrode 37 are electrically separated from the lower movable electrode 35 and upper movable electrode 37. These actuators 27a to 27d and/or 29a to 29d move the lower movable electrode 35 and/or upper movable electrode 37 to adjust the distance between both capacitor sections 35b, 37b, and control the electrostatic capacity.

Abstract: A capacitor provides a plurality of selectable capacitance values, by selective connection of six capacitor sections of a capacitive element each having a capacitance value. The capacitor sections are provided in a plurality of wound cylindrical capacitive elements. Two vertically stacked wound cylindrical capacitance elements may each provide three capacitor sections. There may be six separately wound cylindrical capacitive elements each providing a capacitor section. The capacitor sections have a common element terminal. A pressure interrupter cover assembly is sealingly secured to the open end of case for the elements and has a deformable cover with a centrally mounted common cover terminal and a plurality of section cover terminals mounted at spaced apart locations. A conductor frangibly connects the common element terminal of the capacitor section to the common cover terminal and conductors respectively frangibly connect the capacitor section terminals to the section cover terminals.

Abstract: A symmetrical capacitor includes at least a first metal layer and a second metal layer. Each of the metal layers has a first electrode plate and a second electrode plate separated by a predetermined distance. The first electrode plates on the metal layers are symmetrical, and the second electrode plates on the metal layers are symmetrical. Given the symmetrical structure of the capacitor, the output ports of the capacitor have the same electrical features. Therefore, there will not be a direction problem when the capacitor is used, and the symmetrical electrical features are improved.

Abstract: A multilayer capacitor according to the present invention comprises a multilayer body 2 including a plurality of dielectric layers laminated together, first internal electrodes 3 and second internal electrodes 4 that are arranged alternately with the dielectric layers interposed therebetween inside the multilayer body 2, first extension portions 5a extended from the first internal electrodes 3 to one lateral side A of the multilayer body 2 at one or a plural number of locations, and second extension portions 5b extended from the first internal electrodes 3 to another lateral side B of the multilayer body 2 at one or a plural number of locations, wherein the length of the first extension portions 5a is different from the length of the second extension portions 5b.

Abstract: A laminated electronic component includes a ceramic body having an inner portion and a pair of outer portions disposed above and below the inner portion and a pair of external electrodes disposed on lateral sides of the ceramic body. A plurality of internal electrodes are embedded in the inner portion and alternately connected to the external electrodes. At least two layers of dummy electrodes are embedded in at least one of the outer portions and each connected to one of the external electrodes. An innermost one of the dummy electrodes has a same polarity as an adjacent outermost one of the internal electrodes. The dummy electrodes include at least one pair of adjacent dummy electrodes of opposite polarities.

Abstract: In one inventive aspect, a multilayer ceramic capacitor is provided, in which occurrence of cracks can be prevented even when temperature of the capacitor itself is increased. Non-flat portions are formed in both sides in a width direction of each of inner electrode layers. In addition, the non-flat portions comprise regions substantially changed into oxide regions, therefore a thermal expansion coefficient of the non-flat portions can be decreased so that stress due to difference in thermal expansion coefficient to non-flat portions can be reduced, and the stress can be dispersed in accordance with curvature or inclination of the non-flat portions. That is, stress generated when temperature of the capacitor itself is increased is decreased and dispersed, thereby occurrence of cracks due to the stress can be prevented in side margins of the ceramic chip.

Abstract: In one inventive aspect, a multilayer ceramic capacitor is provided. The capacitor comprises dielectric layers and internal electrode layers alternately stacked. Two of the internal electrode layers that are located outermost and/or at least one of the internal electrode layers that is located inside each outermost internal electrode layer are substantially oxidized and do not function as electrodes. The capacitance of the multilayer ceramic capacitor depends on the unoxidized internal electrode layers other than the oxidized ones. In another inventive aspect, a method for manufacturing a multilayer ceramic capacitor is provided. The method comprises forming green dielectric layers, forming green internal electrode layers, preparing a green ceramic chip, forming green external electrodes, and firing the green ceramic chip.

Abstract: A multilayer capacitor comprised of dielectric layers stacked to form a device body in which a plurality of first internal electrode layers and a plurality of second internal electrode layers formed in planar shapes are alternately arranged while being separated through the dielectric layers, wherein the first external electrodes and second external electrodes are arranged at only a first end face of the device body, lead use columnar electrodes connect the internal electrode layers stacked close to the first end face of the device body and external electrodes, interlayer connection use columnar electrodes connect the internal electrode layers stacked at the inside of the device body, and the interlayer connection use columnar electrodes have cross-sectional areas larger than the cross-sectional areas of the lead use columnar electrodes.