Abstract: A first regenerator of a regenerative refrigerator includes a first regenerator member and a first cylinder accommodating the first regenerator member. A second regenerator includes a second regenerator member and a second cylinder accommodating the second regenerator member and may be connected to a low temperature end of the first regenerator. A gas pipe guides a coolant gas discharged from the first regenerator to a portion in the middle of the second regenerator. The gas pipe may include a plurality of gas relief holes in the middle of the gas pipe.

Abstract: A regenerative refrigerator includes: a regenerator unit that precools a working gas; and an expander that cools the working gas by expanding the working gas precooled by the regenerator unit. The regenerator unit includes a zinc based regenerator member formed of zinc or an alloy containing zinc as a main component of the alloy. A first stage regenerator optionally includes a high temperature part including a first regenerator member and a low temperature part including a second regenerator member different from the first regenerator member. A second stage regenerator optionally includes a high temperature part including a second regenerator member and a low temperature part including a third regenerator member different from the second regenerator member. The second regenerator member optionally includes a zinc based regenerator member formed of zinc or an alloy containing zinc as a main component of the alloy.

Abstract: A first-stage regenerator material and a second-stage regenerator material are regenerator materials each having a laminated structure for use in a GM refrigerator. Each layer of the regenerator material is provided with a plurality of holes to allow gas to pass therethrough along a laminating direction. At least one layer includes a base material and a coating covering the base material. Volumetric specific heat of the coating is larger than volumetric specific heat of the base material in a temperature range from 20 K to 40 K.

Abstract: A light guide apparatus includes a light guide and at least one LED arranged beside the light guide. The light guide includes a first surface and a second surface opposite to the first surface. A scatter layer is attached on the first surface adjacent to the LED and configured to scatter light beams from the at least one LED, a reflective layer is attached on the second surface away from the LED and configured to reflect light beams from the at least one LED to the first surface. The light refracting out from the first surface achieves a homogeneous illumination effect via the diffuse of the scatter layer and the reflection of the reflective layer.

Abstract: A disassembling device includes a plate, a number of suction cups, a number of fasteners, and a number of rods. The suction cups and the fasteners are respectively disposed at opposite sides of the plate to the fasteners. The plate includes a number of through holes. Each of the rods is fixed to one of the suction cups, the rods extend through the respective through holes, and is connected to the respective fasteners.