US 8,511,173 B2Granted

Displacement transducer

AssigneeThe University of Tokyo

InventorsHiromasa Oku, Masatoshi Ishikawa

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Abstract

Provided is a displacement amplifying device which uses Pascal's principle and is insusceptible to temperature change. A main body (1) is provided with an accommodation space (11) for accommodating a medium (2) therein. The medium (2) is provided with a fluid (21) with a positive thermal expansion coefficient and a movable body (22) with a negative thermal expansion coefficient. The movable body (22) is displaced according to the movement of the fluid (21). The medium (2) is provided with a small-area first movable surface (23) and a large-area second movable surface (24). The displacement of one of the first movable surface (23) and the second movable surface (24) is transmitted to the other via the medium (2). In the displacement amplifying device, even if the volume of the fluid (21) is changed by the temperature change of the medium (2), the amount of change of the volume of the medium (2) as a whole can be kept low by the volume change of the movable body (22).

Claims17

Dependent claims

A displacement transducer device, having a main body, a medium and a volume compensation section, wherein

the main body has a containment space for holding the medium inside;
the medium is contained inside the containment space, and
the medium is further comprised of a fluid having a positive coefficient of thermal expansion and movable bodies having a negative coefficient of thermal expansion, wherein
the movable bodies are constructed to displace in accordance with movement of the fluid;
the medium further comprises a first movable surface and a second movable surface;
the first movable surface constitutes part of a surface of the medium;
the second movable surface constitutes another part of a surface of the medium;
surface area of the second movable surface is larger than surface area of the first movable surface;
displacement in one of the first movable surface or the second movable surface is transmitted via the medium to the other of the first movable surface or the second movable surface;
the volume compensation section is made from a material having a negative coefficient of thermal expansion;
the volume compensation section is arranged adjacent to the medium;
and wherein the volume compensation section has a block shape having larger volume than the movable bodies.

9 more elements

Dependencies are inferred from the claim text.