摘要:
A camera which maintains accuracy of stop position in accordance with the state of an image-taking optical system and allows driving of a focus lens to a target position in a short time period, is disclosed. The camera comprises a motor which drives the focusing lens, and a controller which controls the motor such that the focusing lens is stopped at the target position by performing deceleration control in accordance with a predetermined deceleration control pattern. The controller changes the deceleration control pattern in accordance with the state of the image-taking optical system detected by the state detector.
摘要:
A camera which maintains accuracy of stop position in accordance with the state of an image-taking optical system and allows driving of a focus lens to a target position in a short time period, is disclosed. The camera comprises a motor which drives the focusing lens, and a controller which controls the motor such that the focusing lens is stopped at the target position by performing deceleration control in accordance with a predetermined deceleration control pattern. The controller changes the deceleration control pattern in accordance with the state of the image-taking optical system detected by the state detector.
摘要:
An optical apparatus includes an actuator for driving an optical function member of an interchangeable lens, a storage part (memory) storing a plurality of driving patterns for the actuator in advance, and a controller for controlling the actuator to perform driving using one of the plurality of driving patterns stored in the storage part (memory). The controller selects one of the plurality of driving patterns from the storage part (memory) in accordance with the type of image pickup apparatus on which the interchangeable lens is mounted.
摘要:
An apparatus for producing a metallic ribbon includes a cooling roll, a melt nozzle, and an air-cutoff unit provided to cover at least a portion of the periphery of the cooling roll and at least the melt blowout end of the melt nozzle, for preventing an inflow of air due to rotation of the cooing roll. The air-cutoff unit has a roll top air-cutoff plate provided above the cooling roll to extent from the front side to the rear side in the rotation direction of the cooling roll in such a manner that it approaches the cooling surface in the direction opposite to the rotation direction of the cooling roll. The melt blowout end of the melt nozzle is arranged to pass through a nozzle mounting hole provided in the roll top air-cutoff plate and face the cooling surface of the cooling roll.
摘要:
The present invention provides a method for producing layered aluminum fine particles, and applications to single electron tunneling quantum devices, and the present invention further relates to a method for producing spherical metallic aluminum fine particles (layered aluminum fine particles), characterized in that metallic aluminum is supplied into a mixed gas of helium and 1.times.10.sup.-7 to 3.times.10.sup.-7 torr water vapor by sputtering induced by argon gas discharge to generate aggregates, after which this product is released into a vacuum to generate single crystals in which the surface layer is covered with alumina.
摘要:
A metal ribbon manufacturing apparatus which comprises a cooling roll having a cooling surface for cooling a melt, a melt nozzle confronting the cooling surface with a prescribed gap maintained between it and the cooling roll, gas flow supply means for supplying an inert gas to the periphery of the melt nozzle, roll outside periphery atmosphere shutoff means for covering at least a portion of the outside periphery of the cooling roll and preventing the atmosphere from being rolled in by the rotation of the cooling roll, and an atmosphere staying portion disposed on the front side in the rotating direction of the cooling roll of the roll outside periphery atmosphere shutoff means.
摘要:
A lens driving device includes a stator, a rotor magnetized to have a plurality of poles, an arm fixed to the rotor in such a manner as to be rotatable together with the rotor, a moving member for rectilinearly moving a lens in response to a rotation of the arm and a coil for causing the stator to generate a magnetic flux to rotate the rotor.
摘要:
A motor for driving a moving member with respect to a member which serves as a reference of the movement includes at least two first piezoelectric actuators for operating an operating portion thereof such that it is brought into contact with and is moved away from said member, and at least one second piezoelectric actuator operating such that it changes a distance between the plurality of first piezoelectric actuators. At least one of the plurality of first piezoelectric actuators employs a bimorph type piezoelectric element.
摘要:
A projection apparatus for projecting through an optical system a circuit pattern formed on a mask or reticle onto a wafer. Ambient or environment conditions of the apparatus, such as an atmospheric pressure, temperature and humidity are detected and, on the basis of the results of detection, any focus error and magnification error upon pattern projection on the wafer are corrected.