| 摘要 |
PURPOSE:To reduce thermal deformation in case of heating or cooling by making the sectional shape in the direction perpendicular to the optical axis of a plate-shaped member uneven in the direction of the optical axis. CONSTITUTION:This device consists of the plate-shaped member which is arranged vertically with respect to the optical axis and has one face, to which a heating body and/or a cooling body are joined, at least, and the sectional shape in the direction perpendicular to the optical axis of the plate-shaped member is made uneven in the direction of the optical axis. When power is supplied to a film heater 13 to heat a midseat heater 3 and an incubation observing vessel 4 is controlled to a set temperature, the lower face, which is brought into contact with the film heater 13 of a disc 11, of the heater 3 has a temperature higher than that of the upper face of the disc 11 and is more expanded thermally therefore, but the stress due to the difference of thermal expansion between the upper face and the lower face of the disc 11 is concentrated to two ring-shaped grooves 11b and 11c provided on the lower face of the disc 11, and thermal distortion is absorbed by ring-shaped grooves, and thus, downward deformation of the disc 11 is reduced.
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