Passive mechanical athermalization device, and related optical system

摘要

The invention relates to a passive mechanical athermalization device, comprising: a barrel (1) that is made of a first material having a first thermal expansion coefficient (11) and that has a longitudinal axis (AA), said barrel comprising at least one first portion (11) and at least one second portion (12), the device being characterized in that it comprises: at least three beams (7) made of the first material, each of the beams (7) circumferentially connecting the first portion (11) and the second portion (12) relative to the longitudinal axis (AA); at least three bars (8) made of a second material having a second thermal expansion coefficient (12) that is different from the first thermal expansion coefficient, circumferentially distributed around the barrel (1) relative to the longitudinal axis (AA), each bar (8) axially connecting the first portion (11) and the second portion (12) relative to the longitudinal axis (AA) such that the thermal expansion of the barrel (1) results in a deformation of the beams (7) and of the bars (8) along the longitudinal axis (AA). The invention also relates to an optical system comprising such a passive athermalization device.

主权项

1. A passive mechanical athermalization device comprising:
a barrel (1) formed of a first material having a first thermal expansion coefficient (λ1) and having a longitudinal axis (AA) and a radial axis (BB) perpendicular to the longitudinal axis (AA), the barrel (1) comprising at least one first portion (11) and at least one second portion (12), at least three beams (7) formed of the first material, each of the beams (7) connecting the first portion (11) and the second portion (12), and extending circumferentially relative to the longitudinal axis (AA) in a direction (C) perpendicular to the longitudinal axis (AA) and to the radial axis (BB), at least three bars (8) formed of a second material having a second thermal expansion coefficient (λ2) different from the first thermal expansion coefficient, and circumferentially distributed around the barrel (1) relative to the longitudinal axis (AA), each bar (8) connecting the first portion (11) and the second portion (12) axially relative to the longitudinal axis (AA), so that thermal expansion of the barrel (1) translates as deformation of the beams (7) and bars (8) along the longitudinal axis (AA).