Abstract: A camera-assisted presentation apparatus, which is one of imaging apparatuses, has a table including a fixation member and two extension members, and a camera support assembly with a video camera attached to one end thereof. The two extension members are attached to the fixation member in a pivotally rotatable manner. In a service state of the camera-assisted presentation apparatus, the fixation member and the two extension members are extended to form one identical plane and ensure a wide area, on which a material for presentation is mounted. In a non-service state of the camera-assisted presentation apparatus, the two extension members are folded down to a camera holder member and an arm member of the camera support assembly. This arrangement significantly reduces the whole size of the camera-assisted presentation apparatus in its non-service state and effectively enhances the portability of the camera-assisted presentation apparatus.

Abstract: A monitoring camera includes a camera housing, a camera body housed in the camera housing, a lens barrel protruding from the camera housing, and a lens housing mounted for protecting the lens barrel. The lens housing is detachably mounted on the camera housing by bayonet engagement.

Abstract: A casing for encasing equipment installed outdoors, such as a monitoring camera, includes a bottom having a drain hole formed through the bottom. The drain hole includes a first part and a second part having a larger inner diameter than the first part. The second part is open at an underside of the casing.

Abstract: A monitoring camera includes a camera housing, a camera body housed in the camera housing, a lens barrel protruding from the camera housing, and a lens housing mounted for protecting the lens barrel. The lens housing is detachably mounted on the camera housing by bayonet engagement.

Abstract: In a clock management apparatus for a synchronous network system, when the quality of a clock signal is deteriorated, the clock signal is switched to another clock signal automatically to continue synchronous communication. Clock signals are received and extracted by transmission/receiving units of the synchronous network system. A plurality of clock signals including the extracted clock signals and a clock signal from an external clock are selectively switched by a clock switching unit, and a master clock signal is selected and output based on quality information transferred with each clock signal. The master clock signal is applied to a clock generator generate a clock signal. A quality control table is used to convert quality information into associated quality levels. A quality determination processing unit issues an alarm when the quality level of the master clock signal is deteriorated beyond a threshold provided by a synchronization management table.

Abstract: A camera-assisted presentation apparatus, which is one of imaging apparatuses, has a table including a fixation member and two extension members, and a camera support assembly with a video camera attached to one end thereof. The two extension members are attached to the fixation member in a pivotally rotatable manner. In a service state of the camera-assisted presentation apparatus, the fixation member and the two extension members are extended to form one identical plane and ensure a wide area, on which a material for presentation is mounted. In a non-service state of the camera-assisted presentation apparatus, the two extension members are folded down to a camera holder member and an arm member of the camera support assembly. This arrangement significantly reduces the whole size of the camera-assisted presentation apparatus in its non-service state and effectively enhances the portability of the camera-assisted presentation apparatus.

Abstract: A visual presentation apparatus includes a generally rectangular stage on which a material is placed, a video camera for obtaining an image of the material, a camera arm on which the video camera is mounted so that the video camera is located above a central portion of the stage, and an arm mount provided outside one of corners of the stage. The arm has a proximal end pivotally mounted on the arm mount so that the camera arm is caused to pivot substantially along a diagonal of the stage between a first position where the video camera is located above the central portion of the stage and a second position where the camera arm is folded down along the stage. The video camera is located within the stage when the arm assumes the second position.

Abstract: To set a distance between a lens mounting surface of a lens mount and a image pickup element for a back-focus of a interchangeable lens, the video camera comprises two guide pins fixed inside a front panel of a camera body parallel to an optical axis of a lens, said front panel which the lens mount is fixed in, a carrier supported by the two guide pins to move parallel to the optical axis, said carrier to which the image pickup element is fixed, a spring provided between the carrier and the front panel of the camera body to bias the carrier in such a direction that the carrier separates from the lens mount, a screw shaft rotatably assembled on the camera body by a holder to move parallel to the optical axis of the lens, said screw shaft having one end connected with the carrier and the other end on which an adjusting ring is screwed, and an opening formed in the camera body.

Abstract: A method of working on a sloping surface of work is disclosed by means of a numerically controlled machine tool comprising a cutting tool carried by a spindle movable along three orthogonal axes, and a worktable rotatable both about its own axis and about another axis angularly displaced 45 degrees therefrom. The tool movements along the three axes and the worktable revolutions about the two axes are all controlled by a numerical control system, to which there are input prescribed data concerning the particular workpiece to be machined. The numerical control system is programmed to cause the machine tool to work, for example, on a conical surface or to drill one, two or more holes in preassigned positions on a sloping surface.

Abstract: An F-.theta. lens system comprising a first lens group consisting of a first positive meniscus lens component and a second negative lens component, and a second lens group consisting of a third positive lens component and a fourth positive lens component, said lens system comprising a small number of lens elements, a small F number and a large field angle.

Abstract: An apparatus for angularly positioning a rotary member such as turn table, etc. by employing two separate motors.First motor is connected to drive the rotary member in a work operation and second servo motor is connected to drive the rotary member in a servo angular positioning movement.A power transmission mechanism is connected with the first motor to rotate the rotary member in the work operation and a coupling mechanism including a single position clutch therein is connected with the second motor to rotate the rotary member in the servo movement. A first detector is provided to detect a predetermined angular reference position of the single position clutch and a second detector is disposed to detect a predetermined reference position of the rotary member and thereby allowing the single position clutch to engage. A controller is connected with the second motor and with the first and second detectors to regulate the servo operation.

Abstract: An f-.theta. lens system comprising the first lens element which is a positive lens, the second lens element which is a negative lens and the third lens element which is a positive lens. This lens system can be formed as a small lens of a wide angle and has a focusing ability close to the diffraction limit.

Abstract: A constant-speed scanning lens system comprising a first, second, third, fourth and fifth lens components, the first lens component being a positive meniscus lens arranged concave toward the incident side, the second lens component being a negative lens, the third, fourth and fifth lens components being positive meniscus lenses respectively arranged concave toward the incident side, the constant-speed scanning lens system having a small F number, wide field angle and compact size.

Abstract: A lens system for facsimile comprising a first positive lens component, a second biconcave lens component and a third lens component consisting of a negative lens element and a positive lens element, said lens system having high OTF and assuring very low distortion as well as high intensity for marginal rays.

Abstract: A retrofocus type wide-angle lens system for use in micro readers, micro printers, facsimiles, etc. comprising a first negative meniscus lens component, a second positive lens component, a third biconcave lens component, a fourth positive lens component, a fifth positive lens component and a sixth negative meniscus lens component. Said lens system assures high resolution even at marginal portions of image and has a high aperture efficiency.

Abstract: A high resolution objective lens system for ultra microfiche designed for a magnification of 1/150x.about.1/120x and comprising a first cemented lens component consisting of a positive lens element and a negative lens element, a second positive lens component, a third positive lens component, a fourth negative cemented lens component, a fifth positive lens component and a sixth cemented lens component consisting of a negative meniscus lens element and a positive meniscus lens element.

Abstract: A light-weight objective which comprises a small number of lens components, i.e., a first positive lens component, a second positive lens component and a third positive cemented lens component and can be manufactured at low cost, and wherein aberrations are favorably corrected at a wavelength of 6328 A.

Abstract: Achromat objective lens systems and more particularly an objective lens system having a magnification .beta. on the order of 10 to 30X and designed to operate particularly for the monochromatic light whose wave length is on the order of 6328 A. The lens system consists of three lens components and four lenses. The first and second lens components are positive singlet lenses. The third lens component is a positive doublet lens composed of a negative meniscus lens and a biconvex lens. The lens system is constructed so as to satisfy the following three conditions:______________________________________ 0.9f<d.sub.2 +d.sub.3 +d.sub.4 <1.3f (1) 0.8f<R.sub.6 <1.2f (2) 1.46<n.sub.1d <1.65 1.46<n.sub.2d <1.65 1.46<n.sub.4d <1.65 50<.nu..sub.1d <68 (3) 50<.nu..sub.2d <68 50<.nu..sub.4d <68 .nu..sub.3d <35 ______________________________________Wherein f designates the overall focal length of the system given for a wave length light of 6328 A, R.sub.