Abstract: A force feedback method for presenting a force sense to an operator by jetting gas or liquid from a nozzle of jetting means according to a position or an orientation of a receiver is disclosed. In the force feedback method, the receiver is provided with an inclined side surface unit shaped to be inclined, outward from a center part of the receiver, with respect to an axis line of the receiver, and the force feedback method provides a force, to the receiver, including a component perpendicular to a jet direction of the gas or the liquid, by jetting the gas or the liquid to the inclined side surface unit.

Abstract: A force feedback apparatus of the present invention includes: jetting means that includes a nozzle and that can control a jet amount or a jet direction of gas or liquid jetted from the nozzle; jet control means for controlling the jet amount or the jet direction of the gas or the liquid according to a position or an orientation of a receiver that receives pressure by the gas or the liquid jetted from the jetting means so as to provide force feedback to an operator. When the receiver has a concave shape of a diameter D, intervals for placing the nozzles in the jetting means are set such that at least one nozzle exists within a region having a diameter of a constant×D.

Abstract: A force feedback method for presenting a force sense to an operator by jetting gas or liquid from a nozzle of jetting means according to a position or an orientation of a receiver is disclosed. In the force feedback method, the receiver is provided with an inclined side surface unit shaped to be inclined, outward from a center part of the receiver, with respect to an axis line of the receiver, and the force feedback method provides a force, to the receiver, including a component perpendicular to a jet direction of the gas or the liquid, by jetting the gas or the liquid to the inclined side surface unit.

Abstract: A force feedback apparatus of the present invention includes: jetting means that includes a nozzle and that can control a jet amount or a jet direction of gas or liquid jetted from the nozzle; jet control means for controlling the jet amount or the jet direction of the gas or the liquid according to a position or an orientation of a receiver that receives pressure by the gas or the liquid jetted from the jetting means so as to provide force feedback to an operator. When the receiver has a concave shape of a diameter D, intervals for placing the nozzles in the jetting means are set such that at least one nozzle exists within a region having a diameter of a constant×D.

Abstract: A toner for developing an electrophotographic image and a method for forming an electrophotographic image using the toner. The toner comprises a binder and a colorant, in which a volume average diameter of the toner particles, Dv in .mu.m, and a storage modulus at 170.degree. C. thereof, G'.sub.170 in dyne/cm.sup.2, satisfy the following relation;-(2/15)Dv+3.5.ltoreq.log G'.sub.170 .ltoreq.-(3/15)Dv+5.5.In the method, an electrophotographic image is developed by the above-mentioned toner and fixed by a fixing roller covered with a surface layer comprising a fluorine-containing resin.

Abstract: During a software designing operation, a designer accesses a level prescribing unit through an interaction managing control unit. The level prescribing unit provides the guidance to specification information and design parts, etc. at a desired design level. If the designer selects and inputs specification information or design parts, the design editor corresponding to the design specification information in a design editor unit is activated, so that the designer is guided and aided through a display to produce a desired software. At this time, the information about the state of the editing operation "completed" or "not completed" is stored with the directory. The designed document satisfying a specific condition, for example, a document determined to be "design completed", is stored as a data base by a design data base storing unit.