Abstract: A human body detection sensor includes: a detection decision unit that decides whether a state is a detection state or a non-detection state of a detection target; a specular reflection decision unit that decides whether or not reflected light that is incident onto a line sensor is specularly-reflected light; and a continuation decision unit that decides whether or not a state in which the detection target exists is ongoing, wherein, when specularly-reflected light is detected while a determination is made indicating the detection state, the detection decision unit keeps the result of a determination indicating the detection state without change if the result of the decision by the continuation decision unit indicates that the state is ongoing and changes the determination to a determination indicating the non-detection state if the result of the decision shows any other states.

Abstract: A person-detecting sensor includes: a range-finding unit that decides whether a distance to a detection object falls within a predetermined detection distance range; a received-light quantity decision unit that decides whether a received-light quantity is equal to or greater than a predetermined received-light quantity threshold; and a continuation decision unit that decides whether a state of the detection object being present is ongoing. In the received-light quantity decision unit, after water discharge is started upon the detection determination unit determining a detection object to be under detection state, for a period during which the continuation decision unit decides the state in which the detection object being present is ongoing, the received-light quantity threshold is set to be lower than prior to when the water discharge is started.

Abstract: A person-detecting sensor includes: a range-finding unit that decides whether distance to a detection object falls within a predetermined detection distance range; and a specular reflection decision unit that decides whether reflected light is specularly-reflected light. The specular reflection decision unit performs a threshold determination regarding the count of pixels or the proportion of pixels exhibiting a received-light quantity of a predetermined proportion or greater with respect to the maximum received-light quantity among received-light quantities from the reflected light and decides that the reflected light is specularly-reflected light when the count of the pixels or the proportion of the pixels is a predetermined threshold or less.

Abstract: A person-detecting sensor includes: a range-finding unit that decides whether distance to a detection object falls within a predetermined detection distance range; and a specular reflection decision unit that decides whether reflected light is specularly-reflected light. The specular reflection decision unit performs a threshold determination regarding the count of pixels or the proportion of pixels exhibiting a received-light quantity of a predetermined proportion or greater with respect to the maximum received-light quantity among received-light quantities from the reflected light and decides that the reflected light is specularly-reflected light when the count of the pixels or the proportion of the pixels is a predetermined threshold or less.

Abstract: A person-detecting sensor includes: a range-finding unit that decides whether a distance to a detection object falls within a predetermined detection distance range; a received-light quantity decision unit that decides whether a received-light quantity is equal to or greater than a predetermined received-light quantity threshold; and a continuation decision unit that decides whether a state of the detection object being present is ongoing. In the received-light quantity decision unit, after water discharge is started upon the detection determination unit determining a detection object to be under detection state, for a period during which the continuation decision unit decides the state in which the detection object being present is ongoing, the received-light quantity threshold is set to be lower than prior to when the water discharge is started.

Abstract: A human body detection sensor includes: a detection decision unit that decides whether a state is a detection state or a non-detection state of a detection target; a specular reflection decision unit that decides whether or not reflected light that is incident onto a line sensor is specularly-reflected light; and a continuation decision unit that decides whether or not a state in which the detection target exists is ongoing, wherein, when specularly-reflected light is detected while a determination is made indicating the detection state, the detection decision unit keeps the result of a determination indicating the detection state without change if the result of the decision by the continuation decision unit indicates that the state is ongoing and changes the determination to a determination indicating the non-detection state if the result of the decision shows any other states.

Abstract: A method for the production of microfine frozen particles comprises filling a vessel with a cold gas which may be a cooled gas or mixed gas obtainable by mechanical refrigeration of a refrigerant gas, air, or the like, atomizing a material to be frozen, such as water, into the cold gas so that the atomized particles become frozen by heat exchange with the cold gas, and collecting the fine frozen particles thus produced.