Highlighting a selected area of a holographic display indirectly by selectively repositioning a small lens within the hologram illumination beam.

A clip for attaching printing unit guide rails to a printing apparatus guide rail support member. The clip is held to the print frame by spring tension between a spring foot and a guide rail retainer. The guide rail is held in place in the clip by spring tension between a leaf spring and the guide rail retainer.

A duplex copying machine is provided with an open operator-accessible buffer storage tray and appropriate sheet feeding means to feed paper through the machine. In duplexing mode, sheet feeding takes place from the buffer storage tray instead of the main paper supply store.

A cassette for pre-formed U-shaped staples comprising a core member formed with a helical rib and a web of pre-formed U-shaped staple elements wound on said core member in helical fashion following the rib formed on said core member. A tape attached to the web serves to apply rotative movement to the core member which moves axially for dispensing of the staples.

An eyepiece having a wide field of view and a large eye relief. The eyepiece is made up, going from the front to the rear, of a double convex singlet, a negative meniscus-shaped doublet concave to the front, a positive meniscus-shaped doublet concave to the front, a double concave singlet, two double convex singlets and a positive meniscus-shaped doublet convex to the front.

A weighted capacitor digital to analog converter is disclosed which requires only one stage and one conversion step. By the use of two reference voltages and two groups of capacitors in parallel, various capacitors in these groups can be selectively switched from the reference voltages to ground potential in response to input binary digit signals thereby presenting a predetermined amount of voltage to the output amplifier depending upon the number and particular combination of capacitors switche…

A display device incorporates an optical demagnifying component adjacent the display surface. The optical component forms a demagnified real or virtual image of the display formed at the display viewing surface, effectively increasing the view angle of an observer.

A magnetic disc drive brake assembly which automatically locks the disc drive when it is removed from its case. As the disc drive is lifted, a spring is released, which spring forces a brake pad into contact with the disc drive hub, thus locking the disc drive in place. Reversing the process automatically releases the disc drive.

Apparatus for registering one or more sheets in a registration position defined for example in a corner formed by two edge stops has a sheet support member and a tamping member that engage the edge or edges of the sheet or sheets on the support member. The tamping member is mounted on the end of an arm which is mounted for angular movement about a shaft. On movement of the arm the tamper moves so as to push the sheet(s) into the registration position. The tamping member includes a brush having b…

A copying apparatus including a transparent glass platen (10) across which documents for copying are moved. On its face remote from that across which documents are moved, the platen carries a layer (11) of a material which has a lower surface resistivity than the glass, and is typically less than 10.sup.9 ohms per square. The conductive layer is electrically connected, for example to ground, so as to remove electrostatic charge from the platen.