Abstract: A data symbol reading device for decoding a data symbol is provided with a reading head which has an opening for contacting a symbol reading surface on which the data symbol is positioned. The reading head also includes an optical system for forming an image of the data symbol on an imaging device. The imaging device outputs the image to a processing device which determines that the data symbol is read properly. The data symbol reading device further includes a printing device for printing a predetermined code on the data symbol in response to the processing device determining that the data has been properly read. The data reading device further includes a print mode selection system which selects one of a plurality of printing modes. The printing device prints none or at least one of the predetermined codes in response to the printing mode selected by the print mode selection system.

Abstract: An afocal zooming optical system comprising a plurality of lens groups or components, in which the lens groups movable along the optical axis for zooming do not include the lens group closest to the eye, with the lens group positioned closest to the eye being movable for dioptry adjustment.

Abstract: An electronic endoscope having an internal circuit board bearing an electronic circuit arrayed thereon and coupled with a solid-state image pick-up element, with wires of the circuit board connected to lead wires passing through the insertion portion of the endoscope. The circuit board is folded along lines extending the axial direction of the distal end of the insertion portion, so as to divide the circuit board into a plurality of planar surfaces. The electronic circuit wiring portion and the lead wire connecting portion are laid out on the different planar surfaces.

Abstract: A dual type imaging device includes a first CCD and a second CCD, on which complementary color filters with a checkerboard (or matrix) arrangement is disposed. The complementary color filters have the same construction as each other, having magenta elements, yellow elements, cyan elements and green elements arranged in a regular manner. The arrangement of the color elements of the filter of the first CCD is offset, by a width of one light-sensitive element, to the arrangement of the color elements of the filter of the second CCD. An R-signal, a G-signal and a B-signal are sensed in accordance with four light-sensitive elements which are arranged in a 2.times.2 matrix.

Abstract: A wide-angle lens system of the seven-unit-seven-element configuration. Arranged in ordered from the object side are two opposed negative meniscus lenses, two opposed positive lenses, a negative lens and two lens with opposed convex surfaces. Four required and one optional numerical conditions are imposed on the focal length, radius of curvature, Abbe numbers and refractive indices.