摘要:
Provided are a lens apparatus and an optical apparatus having the same, the lens apparatus including a lens holding member holding a lens, a supporting member for supporting the lens holding member movably in the direction of the optical axis of the lens, a first drive mechanism for moving the supporting member in the direction of the optical axis, and a second drive mechanism for moving the lens holding member in the direction of the optical axis, wherein a focusing lens can be moved to an in-focus position within a short time and highly accurately by an AF system.
摘要:
In a projection type display apparatus that projects an image by inputting a light beam emitted from a light source to a spatial light modulation device, it is intended to provide a lens array as a component of an illumination optical system that is low in manufacturing cost, provides high screen illuminance, and enables miniaturization of the projection type display apparatus. The dimension of the cell lenses of a second lens array is not uniform in one of the row direction and the column direction. Since the cell lenses are rectangular when viewed from the front side, the second lens array can be manufactured with a metal mold having a simple shape. The boundary lines between the cell lenses are straight and level differences at the boundary lines are small, sink marks of the second lens array are small, and the efficiency of utilization of light beams is high. Further, since the dimension of the cell lenses is not uniform in the other of the row direction and the column direction, the corresponding dimension of the second lens array can be reduced.
摘要:
A vibration wave driven motor includes a vibrating member for generating a travelling vibration wave in response to signals applied thereto a movable body having a frictional member contacting the vibrating member, a bearing member and a vibration damper member provided between the frictional member and the bearing member in order to absorb the vibration; and an adhering member for adhering at least either of an end of the damper member in contact with the frictional member or another end of the damper member in contact with the bearing member to the frictional member or the bearing member which is opposed to either of the ends.
摘要:
A skid beam for use in a walking beam type heating furnace which has operating temperature exceeding 1000.degree. C. comprises a hollow skid pipe of heat resistant alloy, skid buttons provided upright on the skid pipe and arranged axially thereof at a predetermined spacing, and a refractory lining covering the outer peripheral surface of the skid pipe and each of the skid buttons over the base portion thereof toward its upper portion. Each of the skid buttons comprises a first member attached to the skid pipe and made of a heat-resistant alloy, and a second member to be brought into contact with the material to be heated. The second member is made of a composite material composed of a heat-resistant alloy and ceramic particles dispersed therein in an amount of 30 to 70% by weight based on the composite material. The skid button has a height exceeding 120 mm. The lining portion covering the skid button over the base portion thereof toward its upper portion has a thickness so as not to give a temperature difference of 40.degree. C. between the top of the skid button and the interior of the furnace.
摘要:
A lens is provided with first and second coupling means which are arranged at both ends of the lens barrel of the lens in the direction of the optical axis thereof so that the lens can be turned round and mounted in a reversed posture on a camera to permit macro-photography.
摘要:
The disclosed zoom lens apparatus operates in a manual focusing mode and an automatic focusing mode with a manual focusing movement imparted to one lens component and an automatic focusing movement imparted to another lens component. In the automatic focusing mode, the manual focusing lens component is held stationary at a prescribed constant position and the automatic focusing lens component operates within limits which vary with zooming. In the manual focusing mode, the automatic focusing lens component rests at one of the limits of the zooming and focusing ranges.
摘要:
This invention relates to a process and an apparatus of constructing a water tight underground pile wall in the form of a row of piles in which previous piles are installed every other pile and thereafter subsequent piles are installed between said previously formed piles, both of said piles being connected together.
摘要:
The invention provides a photographing apparatus having a focusing system for controlling the movement of a focusing lens. The output of the signal from the focusing system is so controlled that the continuous operation of the focusing system is interrupted in response to the operation of an imaging device such as a single reflex camera, a video camera, etc.
摘要:
In the disclosed diaphragm device, an electromagnetic unit is composed of two opposing sets of circularly arranged magnets poled so that opposing surfaces have the same polarity, a rotary member carrying an electromagnetic coil that moves the rotary member in response to current therethrough and the field of the magnets, and diaphragm blades which are positioned between the magnet members and the rotary member and pivoted to close the aperture in response to rotation of the rotary member in one direction. When the rotary member is rotating in the closing direction, stopping means respond to an input signal and stop movement of the diaphragm blades at a particular aperture value.
摘要:
A camera is provided which includes an image capturing element; a memory for recording images obtained from the image capturing element; and a controller for changing the number of recorded pixels of the images stored in the memory based on information about a lens apparatus that can be operatively connected to the camera.