Abstract: An image stabilization apparatus which reduces variations in performance with surface accuracy of a rolling surface for rolling members. A movable unit holds an optical element and is rotatable about a first rotational axis perpendicular to an optical axis of the optical element and a second rotational axis perpendicular to the optical axis and the first formational axis through rolling of the rolling members. With the second rotational axis coinciding with a center of the rolling surface, a first ratio of the first moving range of the rolling members to the first rotational range of the movable unit is smaller than a second ratio of the second moving range of the rolling members to the second rotational range of the movable unit.

Abstract: The lens barrel includes a stationary tube, a cam ring, and a rectilinear motion tube. The rectilinear motion tube is moved by the rotation of the cam ring in the optical axis direction. A lens frame holding a lens is moved by a driving unit (feed screw and a motor) in the optical axis direction. The stationary tube includes a main guide bar in the optical axis direction. The rectilinear motion tube includes another main guide bar in the optical axis direction. The lens frame includes first and second fitting portions slidably supported by the main guide bars in the optical axis direction, and the first and second fitting portions are disposed separately in the optical axis direction, and the main guide bars are disposed in different positions around the optical axis.

Abstract: A retractable lens barrel includes a first main bar, a second main bar, a fixed barrel including the first main bar, a linear movement barrel including a second main bar and movable in an optical axis direction, a leaf spring configured to adjust decentering of the second main bar relative to the first main bar in a plane orthogonal to the optical axis, and leaf springs configured to adjust a tilt of the second main bar relative to the first main bar in the optical axis direction by pushing the linear movement barrel onto the fixed barrel at a plurality of positions in a plane orthogonal to the optical axis. The first main bar and the second main bar are configured to guide a lens frame holding a lens. After the second main bar is moved closer to an object than the first main bar, tilt adjustment by the leaf springs is completed following decentering adjustment by the leaf spring.

Abstract: The optical barrel includes a first barrel member having a guiding portion to guide an optical element holding member in an optical axis direction, and a second barrel member disposed around the first barrel member and being relatively rotatable with the first barrel member. The second barrel member is provided with a cam portion to move the holding member, and with a bayonet engagement portion in an outer circumferential portion of the second barrel member. The first barrel member is provided with a flange portion, and with overhang portions and bayonet protrusion portions in plural areas of the flange portion. Each overhang portion extends along an outer circumferential surface of the second barrel member in the optical axis direction. Each bayonet protrusion portion extends inward in the radial direction and engaging with the bayonet engagement portion.

Abstract: The interchangeable lens includes a lens holding member holding a lens, a first supporting bar engaging with the lens holding member to guide movement of the lens holding member in an optical axis direction, a second supporting bar engaging with the lens holding member to prevent rotation of the lens holding member, the second supporting bar having a shorter length than that of the first supporting bar. The interchangeable lens further includes a mount contact provided as an electric contact in a mount portion detachably attachable to a camera body. When viewed from the optical axis direction, the first supporting bar is disposed in an area not overlapping the mount contact, and the second supporting bar is disposed in an area overlapping the mount contact, and when viewed from a direction orthogonal to the optical axis direction, part of the first supporting bar overlaps the mount contact.

Abstract: The lens barrel includes a stationary tube, a cam ring, and a rectilinear motion tube. The rectilinear motion tube is moved by the rotation of the cam ring in the optical axis direction. A lens frame holding a lens is moved by a driving unit (feed screw and a motor) in the optical axis direction. The stationary tube includes a main guide bar in the optical axis direction. The rectilinear motion tube includes another main guide bar in the optical axis direction. The lens frame includes first and second fitting portions slidably supported by the main guide bars in the optical axis direction, and the first and second fitting portions are disposed separately in the optical axis direction, and the main guide bars are disposed in different positions around the optical axis.

Abstract: Light transmitted through the imaging lens 100 is divided into two light fluxes by the half mirror 202 fixed in the camera body 200, and two light fluxes are guided to the imaging element 201 and optical viewfinder, respectively. An image processing unit corrects aberration, which occurs due to the transmittance of light through the half mirror 202, of the image data generated after receiving light at the imaging element 201, by conversion processing based on a transfer function representing its optical transfer characteristics and restores the image data prior to the occurrence of aberration.

Abstract: The present invention is an operation control method on the basis of an ion current in an internal combustion engine, the method comprising a step of detecting the ion current generated within a combustion chamber 30 so as to control an operating state of the internal combustion engine 100 on the basis of a state of the detected ion current, wherein a control at an engine start point in time on the basis of the state of the ion current is stopped for predetermined cycles just after the engine start.

Abstract: Light transmitted through the imaging lens 100 is divided into two light fluxes by the half mirror 202 fixed in the camera body 200, and two light fluxes are guided to the imaging element 201 and optical viewfinder, respectively. An image processing unit corrects aberration, which occurs due to the transmittance of light through the half mirror 202, of the image data generated after receiving light at the imaging element 201, by conversion processing based on a transfer function representing its optical transfer characteristics and restores the image data prior to the occurrence of aberration.

Abstract: An ion current detecting apparatus includes a capacitor C that is charged as a spark plug 3 discharges, a Zener diode ZD that limits a maximum voltage of the capacitor C while charging, a detection resistor R2 through which a discharge current of the capacitor C flows, and a comparator circuit 5 that compares a current value of the detection resistor R2 with a predetermined value. A charge quantity Q of the capacitor C at discharge start is set so that, as a consequence of a discharging operation of the capacitor C, discharge duration required until the current value of the detection resistor R2 falls below the predetermined value becomes longer than time duration in which the ion current generated by fuel combustion in the engine combustion chamber lasts. The ion current detecting apparatus automatically detects degradation in an insulation resistance in the spark plug, ensuring normal operation in engine control.

Abstract: In a method for determining an air fuel ratio of an internal combustion engine on the basis of an ion current, for detecting an ion current generated per ignition within a combustion chamber of the internal combustion engine, the method measures a generation period in which the ion current is greater than a determination value set as long as the ion current is generated, computes a divisor for computing a rate of fluctuation of the generation period of the ion current on the basis of a plurality of measured generation periods, computes the rate of fluctuation of the generation period of the ion current by weighing in a direction of increasing the computed divisor, and determines that an air fuel ratio is excessively high in the case that the calculated rate of fluctuation is equal to or more than a predetermined value.

Abstract: A magnetic disk device includes a VCM coil that controls the movement of a head for recording or reproducing information onto and from a rotating magnetic disk, and an airflow guiding unit that guides an airflow occurring by the rotation of the magnetic disk toward the VCM coil when the temperature of the VCM coil exceeds a limit temperature defined in advance.

Abstract: An aligning device includes a recognizing unit and a determining unit. The recognizing unit recognizes an intersection formed by two straight lines not parallel to each other among a plurality of straight lines of a register mark. The determining unit determines a position based on the recognized intersection. The register mark is used when an FPC terminal and a head terminal are superposed and connected. The FPC terminal is a wiring pattern formed on an FPC in a magnetic disk device. The head terminal is one of wiring patterns that are connected to a magnetic head in the magnetic disk device and is located in a portion that is superposed with the FPC terminal. The determining unit determines a position on the FPC where the head terminal is superposed.

Abstract: A magnetic disk device includes a VCM coil that controls the movement of a head for recording or reproducing information onto and from a rotating magnetic disk, and an airflow guiding unit that guides an airflow occurring by the rotation of the magnetic disk toward the VCM coil when the temperature of the VCM coil exceeds a limit temperature defined in advance.

Abstract: The present invention is an operation control method on the basis of an ion current in an internal combustion engine, the method comprising a step of detecting the ion current generated within a combustion chamber 30 so as to control an operating state of the internal combustion engine 100 on the basis of a state of the detected ion current, wherein a control at an engine start point in time on the basis of the state of the ion current is stopped for predetermined cycles just after the engine start.

Abstract: A fixing member is spaced from a head actuator by a predetermined distance. A flexible printed circuit board extends at least from the head actuator to the fixing member. The flexible printed circuit board is superposed on the surface of the fixing member. A viscoelastic layer and a protecting layer are overlaid on the surface of the flexible printed circuit board. A clip clips all the fixing member, the flexible printed circuit board, the viscoelastic layer and the protecting layer together. When a head slider is positioned, the head actuator changes its attitude relative to a recording disk. The inertial force based on the rotation causes the first flexible printed circuit board to vibrate when the actuator block stops rotating. The viscoelastic layer serves to absorb this residual vibration of the first flexible printed circuit board. Vibration of the flexible printed circuit board can be suppressed.

Abstract: The invention relates of a method for determining a combustion state of an internal combustion engine, for detecting an ion current generated within a combustion chamber of the internal combustion engine, including the steps of measuring a characteristic value of the ion current detected during a period that the ion current is generated and a generation period in which the ion current is generated, and determining a combustion state on the basis of a relation between the characteristic value and the generation period with respect to an elapsed time from an ignition, and the method comprises determining that the combustion state is normal, by setting a determination reference to be larger with respect to the characteristic value and shorter with respect to the generation period, in the case that the elapsed time from the ignition is short, and determining that the combustion is normal, by setting the determination reference to be smaller with respect to the characteristic value and longer with respect to the g

Abstract: A fixing member is spaced from a head actuator by a predetermined distance. A flexible printed circuit board extends at least from the head actuator to the fixing member. The flexible printed circuit board is superposed on the surface of the fixing member. A viscoelastic layer and a protecting layer are overlaid on the surface of the flexible printed circuit board. A clip clips all the fixing member, the flexible printed circuit board, the viscoelastic layer and the protecting layer together. When a head slider is positioned, the head actuator changes its attitude relative to a recording disk. The inertial force based on the rotation causes the first flexible printed circuit board to vibrate when the actuator block stops rotating. The viscoelastic layer serves to absorb this residual vibration of the first flexible printed circuit board. Vibration of the flexible printed circuit board can be suppressed.

Abstract: According to the present invention, in a spark ignition-type internal combustion engine which has a spark plug and mounted in a vehicle, an ion current generated in a combustion chamber through the spark plug after ignition is detected and smoldering of the spark plug is determined on the basis of the detected ion current. An operation state of the internal combustion engine is detected and smoldering of the spark plug is determined based on that the detected ion current satisfies a predetermined condition when the detected operation state falls within an operation determination range set corresponding to an operation range in which an intake port pressure close to an atmospheric pressure is achieved using predetermined engine speed as an upper limit and a predetermined intake port pressure as a lower limit.

Abstract: The present invention is a combustion state determination method of an internal combustion engine for detecting an ion current which is generated in a combustion chamber at combustion of the internal combustion engine in a detection period to determine a combustion state, comprising steps of detecting a primary combustion period on the basis of a first ion current which forms the detected ion current and occurs immediately after ignition, detecting a secondary combustion period on the basis of the ion current which occurs after disappearance of the first ion current when at least the detected primary combustion period is normal, determining the combustion state on the basis of the detected primary combustion period when the secondary combustion period is smaller than a predetermined value, and determining the combustion state on the basis of a whole combustion period from start of the detection period of the ion current to end of the last secondary combustion period in the detection period when the secondary