Abstract: An optical-path-difference automatic focusing apparatus for a microscope uses four automatic focusing control modes including an object search mode in which an object to be observed is searched for, a rough focus mode in which the object is brought to a roughly focused position with a lower accuracy of focusing, a front and back defocus sensing mode in which the degrees of front and back focusing of the object in at least a front and a back place with respect to the roughly focused position in the rough focus mode, and a fine focus mode in which the degree of focusing of the object with a higher accuracy of focusing is approximated linearly on the basis of the degrees of front and back focusing determined in the front and back defocus sensing mode and the object is brought to the focused position. Use of those modes realizes a highly reliable automatic focusing apparatus for a microscope capable of achieving a higher accuracy of focusing, regardless of the change of the optical condition.

Abstract: The disposable bib includes a panel adapted to overlie a chest region of a wearer having a first surface designed to face outwardly from the wearer, a second surface designed to face toward the wearer, and a compartment(s) formed on or within the second surface of the panel for containing at least one of an eating utensil and a towelette therein.