Abstract:
Apparatus and method for detecting relatively low intensity electromagnetic energy with high sensitivity comprises a transistor having a light sensitive base area, a current detector-load circuit coupled to its collector terminal, and a voltage control circuit coupled to its emitter terminal. The voltage control circuit serves to supply selective potentials to the emitter terminal in order to enable or inhibit conduction. The current detector-load circuit acts as a low impedance transistor collector load and monitors changes in conduction of the transistor.
Abstract:
Two orthogonally disposed acousto-optic deflectors produce a rectangular matrix of light spots in the usual way. A series of mirrors arranged to form a staircase convert the rectangular matrix to a close approximation of a linear array. The number of resolvable spots in the linear array is equal to the product of the capacities of the individual deflectors. In turn, by adding a third acousto-optic deflector the linear array can be expanded to form an enlarged rectangular matrix. In principle, this process can be repeated as often as desired, thereby to realize relatively simple light deflection systems characterized by advantageous capacity-speed products.
Abstract:
Supported photomasks useful in the fabrication of printed circuitry are produced by laser machining of amorphous iron oxide film blanks. Resolution improvement relative to that obtained by use of other film materials is ascribed to crystallization of film regions bordering those which are volatilized.
Abstract:
A high-speed printer includes a prerecorded multicharacter font stored in holographic form. Selection of a stored character for projection onto a recording medium is accomplished by means of a conventional X-Y acousto-optic deflection system. To achieve justified lines and attractively composed words, the printer must have a variable character- and word-spacing capability. This capability is realized by combining an electro-optic light deflector with the acousto-optic system in such a way as to controllably vary the angle at which an incident light beam interrogates a selected holographic character. For each different interrogation angle, the selected character is projected to a slightly different location along a row of the recording medium. In this way there is provided a vernier adjustment of the positions of characters to be printed.
Abstract:
A high-speed printer includes a prerecorded compressed font stored, for example, in holographic form. The constituent parts (for example, bars) of a set of characters to be printed are stored in the hologram. By means of acousto-optic deflection techniques, an incident light beam is directed to illuminate simultaneously the plural areas of the hologram which store the constituent parts of a character selected to be printed. In turn, representations of the parts stored in the illuminated areas are imaged onto a suitable recording medium where recombination and printing of the selected character take place.