Abstract: To provide a highly-precise mechanism in a simple structure as a positional adjusting mechanism of a projector lens on a display device surface, and to provide a projector apparatus capable of manually moving the projector lens by means of an user interface unified into the focus and zoom adjusting mechanism, an outer surface of a lens guide portion is a surface of uneven shapes in which a plurality of protruded portions, each of whose vertical sections has an angle of inclination of 45° and an angle of apex of 90° with respect to a surface of a liquid crystal panel, and a plurality of recesses, each opposing thereto, are arranged at a constant pitch in a vertical direction. An inner surface of the lens guide portion has such a shape as to constitute a part of a cylinder of a tapered configuration such that an inner diameter becomes larger from an incident light side toward an outgoing light side.

Abstract: To provide a highly-precise mechanism in a simple structure as a positional adjusting mechanism of a projector lens on a display device surface, and to provide a projector apparatus capable of manually moving the projector lens by means of an user interface unified into the focus and zoom adjusting mechanism, an outer surface of a lens guide portion is a surface of uneven shapes in which a plurality of protruded portions, each of whose vertical sections has an angle of inclination of 45° and an angle of apex of 90° with respect to a surface of a liquid crystal panel, and a plurality of recesses, each opposing thereto, are arranged at a constant pitch in a vertical direction. An inner surface of the lens guide portion has such a shape as to constitute a part of a cylinder of a tapered configuration such that an inner diameter becomes larger from an incident light side toward an outgoing light side.

Abstract: A reciprocative typing control system in which a typing head is driven reciprocally for typing letters at periodic separations in response to a typing signal A following a delay D. A timing signal is produced each time the head is driven by a predetermined distance less than the letter separation and the timing signals counted. In the forward direction a typing signal is produced when the count equals the number of timing signals totaling the separation. In the backward direction the typing signal is produced when the count plus the number of timing signals in delay D equals the number of timing signals totaling the separation.

Abstract: A thin line printer head in which the leaf springs each extend horizontally in a line between a fixed and free end. The leaf springs may be formed in a flat spring plate by removing portions and adjacent springs may extend oppositely from a central portion of the plate.

Abstract: A horizontal printing type printer including a head feeding motor serving as a shaft feeding motor; a feeding shaft coupled to the motor so that it is rotatable in both directions, the shaft being arranged in a vertical direction perpendicular to the printing line direction; two sheet feeding tractors mounted on the shaft, two one-way clutches provided on the tractors, respectively, the one-way clutches being engaged with the shaft to rotate together with the latter in the sheet feeding direction to feed the printing sheet; and a printing head movably supported on the shaft and a guide rod parallel with the latter, the printing head being moved backwards and forwards in the vertical direction of rotation of the shaft.