Abstract: A light intercepting mechanism of a zoom lens barrel includes a movable lens frame which holds a frontmost lens group, and a drive ring which is fitted on an outer peripheral surface of the movable lens frame to relatively rotate, so that when the relative rotation of the drive ring occurs, the movable lens frame is moved in the optical axis direction. The movable lens frame has a dual-cylinder structure having a closed front end and an open rear end. The drive ring has a dual-cylinder structure having a closed rear end and an open front end. The movable lens frame having the dual-cylinder structure and the drive ring having the dual-cylinder structure are fitted one inside the each other.

Abstract: An antivibration device includes a correcting optical system to correct shake by moving at least a part of a photographic optical system, a support member to support the correcting optical system, and a lens mount member to support the shake correction mechanism. A shielding member is further provided on at least either the support member or the lens mount member so as to keep dust and other potentially damaging airborne material from entering the shake correction mechanism. The shielding member is provided so as to extend substantially parallel to the optical axis of the photographic optical system.

Abstract: A microscope has an eyepiece detachably/attachably inserted in a tube eyepiece mounting portion. The eyepiece has an elastic cover, whose inside protrusion portion is fitted to a peripheral groove at a position between an eyelet and a joint portion of the eyepiece with the mounting portion. The cover extends from the joint portion and sheathes over the mounting portion. An inner diameter of the elastic cover is smaller than an outer diameter of the mounting portion at the joint portion. Thus the elastic cover can shield the joint portion with reliability and no fine particle can intrude into the microscope.

Abstract: A new computer monitor visor for reducing glare from a monitor's video display screen. The inventive device includes a top panel with a side panel hanging downwards from each of the top panel's lateral edges. The side panels are attached to the top panel by a plurality of removable side attachment straps. The rear portion of the top panel rests on the top wall of a computer monitor over the video display screen. The computer monitor visor is held in position on the computer monitor by a pair of computer attachment straps attached to the back wall of the computer monitor and the upper surface of the top panel. A support brace is attached to each side panel bottom edge and extends downwards for resting on a surface to provide additional support to the side panels.

Abstract: The present invention relates to improved optical devices and reflection control techniques. In one aspect, the invention provides an optical device comprising an array of substantially tubular elements and one or more reflective surfaces, wherein at least one of the reflective surfaces positioned behind the tubular elements is tilted with respect to the optical path of the device. This orientation of the reflective surface results in incident light from a source in the field of view of the device being reflected from the tilted surface and captured by the array of elements, rather than the reflected light being projected outward from the device where it can be perceived by a viewer, particularly a viewer in the field of view.

Abstract: A camera has a light shielding member surrounding an axially movable lens housing arranged to project through a circular opening in a camera housing. The light shielding member has an annular disc portion with an inner peripheral grooved surface frictionally engaging an outer cylindrical surface of the lens housing. The disc portion is positioned between a transverse inner surface of the camera housing cover and a surface of a helicoid member. At its outer periphery, the light shielding member has a generally cylindrical flange that projects axially between a longitudinal inner surface of the camera housing and the helicoid.

Abstract: A telescope provided with an automatically opening and closing lens cover which obviates a protective cap attached to the main body. The telescope is provided with a lens hood disposed along a cylinder of the main body in such a manner as to be slidable forward and backward, and two movable lens covers disposed in such a manner as to cover the objective lenses provided at one end of the cylinder. The two lens covers are axially rotatably supported between the objective lenses. A guide pin is attached to the side surface of each lens cover, and a guide groove is provided on the inner surface of the lens hood in such a manner as to be engaged with the guide pin so as to open and close the lens cover by the forward and backward movements of the lens hood. When the lens hood is moved forward and the lens covers covering the objective lenses are opened, thereby enabling observation. When the lens hood is moved backward in this state, the lens covers are replaced to the original position and closed.

Abstract: An optical assembly device (10) for use in front of a television screen having a diagonal dimension of S, which optical assembly comprises four panels (12 to 15) connected together to form a hollow body (11) having a substantially rectangular open front side (16) of width W and the height H and a substantially rectangular open rear side (17) of width W' and height H', the separation between the front and rear sides (16 and 17) being D and the inner sides of the panels being reflective. The optical assembly (10) further comprises front and rear lenses (18 and 19) provided extending across the open front and rear sides (16 and 17), respectively, of the body (11), the front side of the rear lens (19) being reflective, wherein the dimensions are related according to the following formulae:(1) W=[1+(W'/H'-B)].multidot.W'(2) H=[1+(W'/H'-B)].multidot.H'(3) D=K.multidot.SWhere:(i) B=(.sqroot.5-1)/2(ii) 0.1<K<0.2.

Abstract: A camera lens shading device is disclosed having a flexible mounting band that attaches to a camera lens shroud and shade pieces, the shade pieces being made of opaque, flexible, plastic sheet material. A top shade piece attaches to the mounting band and extends outward from above the camera lens, adjustable over a range of angles. Two side shade pieces are attached to the top shade piece and are adjustable in angle to the top piece and in lateral distance therefrom for fitting a variety of camera lens shroud widths. A hinge section is formed in the top shade piece and side shade pieces for angle adjustment, whereby each piece can be adjusted independently to obtain a desired shading effect. A visor section extends forward from the top shade piece and rear screening sections extend rearward from the side shade pieces to further control the light entering the camera lens area.

Abstract: An apparatus for detachably attaching an accessory to a lens barrel, wherein the front end of the lens barrel and the accessory are provided with engaging members which are engaged and disengaged only when a predetermined angular relationship between the lens barrel and the accessory is met. The accessory is provided with at least one roller which is rotatably supported by a shaft extending parallel to an optical axis of the lens barrel. At least one abutting surface is provided on the front end of the lens barrel, and comes into contact with the roller or rollers of the accessory during rotation of the accessory while in contact with the lens barrel.

Abstract: A glare filter for use with a visual display terminal having a display screen on its forward side is disclosed. The glare filter includes a filter screen, a mount, and couplings. The filter screen has lateral edges, a top edge, and a bottom edge. A mount is secured to the terminal and includes two lateral guides that form channels. The distance between the channels is slightly larger than the width of the filter screen to slidably receive the lateral edges of the filter screen. The channels are oriented generally transverse to the surface of the display screen, such that the filter screen may be held above the terminal and above the display screen. The couplings extend from the filter screen and slidably and pivotally engage within the channels of the lateral guides. The couplings are pivotally movable relative to the mount when the filter screen is extended to a forwardmost position relative to the mount. This allows the filter screen to be pivoted downwardly to a position overlying the display screen.

Abstract: The optical apparatus has a pair of relatively movable lens groups which are disposed on the common axis and a light intercepting member secured to and between the two lens groups. The light intercepting member is a thin, relatively long rectangular strip which is helically wound to form a plurality of coils. In an expanded state, the coils are overlapped to prevent incident light from passing into a space between the lens groups. At the same time, the strip is elastically resilient as to maintain the spacing between the two lens groups.

Abstract: A self contained protective shutter assembly for an imager eye piece inclng an eyecup, a powered shutter, switch, power supply and interface coupling.

Abstract: A rain hood assembly is position-adjustably mounted on an exteriorly mounted rearview mirror for protecting the rearview mirror and the side window adjacent to the mirror from rain. The assembly may have a body of which the position relative to the window may be adjusted. A strip of rubber is provided and is position-adjustably fixed on the body for contacting the window. In alternate, the hood assembly may be adjusted in size so as to be mounted on rearview mirror of different size.

Abstract: An optical system with a tube having an open front end and a back end, imaging optics mounted in the tube and a plurality of light reflective baffle portions rotationally symmetric with respect to the optical axis, and wherein first baffle portions are configured as ellipsoids of revolution, all with foci lying adjacent edge portions of the open front end of the tube and facing the the open front end, and wherein the second baffle portions are configured as hyperboloids of revolution facing away from the open end and inwardly of the tube.

Abstract: An eyecup insert is provided which allows easy attachment and removal of an eyecup from an associated night vision goggle. The eyecup provides a light secure seal when pressed against the head of an operator of the goggle. A connecting end of the eyecup has annular channel which engages the insert. The insert is ring shaped with a central aperture having a plurality of detents protruding inwardly of the aperture. The operator can form a snap-fit connection between the eyecup and the goggle by forcing the aperture over a circular flange which surrounds an eyepiece of the goggle until the detents have snapped passed the flange. The eyecup can be removed by reversing the installation procedure.

Abstract: This is to disclose an optical apparatus, comprising a plurality of optical lenses; and a plurality of light blocking plates or blocking member arranged in the direction of the optical axis for blocking harmful sagittal peripheral rays, the light blocking plates being installed in a ring shape at the pupil position of the optical lenses and being inclined, by an angle .alpha. respectively, to a plurality of imaginary planes including the optical axis.

Abstract: A telescope baffle system is disclosed for use with optical instruments. The baffle structure consists of highly reflective low scatter annular arrays of retro-reflecting cube corners which have the capability of returning rays back upon themselves such that most off-axis radiation striking one of the baffle annular arrays is reflected back to its source rather than being absorbed or scattered by the baffle.

Abstract: A one-piece lens hood possesses a frontal surface having an approximately rectangular opening, is axially displaceable via a guide from a position of rest into a working position, and is indissolubly connected to the lens. In the position of rest, the frontal surface of the lens hood terminates flush with the front edge of an accessory mount so that the threaded portion of the accessory mount is readily accessible for screwing in accessories such as filters. A format stop is additionally provided as an integral part of the lens in order to mask out stray light. This can, for example, be formed from a blackened metal foil which is mounted on a front terminal ring of the lens.

Abstract: A light intercepting apparatus provided between a lens barrel which moves in an optical axis direction and a lens holding member which supports the lens barrel so as to slide in the optical axis direction, includes a pair of light intercepting rings which are provided on the lens holding member. Each of the light intercepting rings is made of a flexible material and has a center opening having a diameter that is smaller than an outer diameter of the lens barrel. The inner ends of the light intercepting rings which define the center openings are deformed in opposite directions and brought into contact with an outer peripheral surface of the lens barrel.

Abstract: A positioning wheel resiliently engages and moves an optical element to a selected position within a channel of a holder mounted in front of a camera lens. A brake mechanism prevents the optical element from accidentally falling out of the channel. A handle-operated camming mechanism provides for a quick lock/unlock interlock of a rotary holder in a desired angular orientation.