Abstract: Wavefront aberration-measuring apparatus are disclosed that can easily and accurately correct interference-fringe distortions arising from aberrations of an optical system in an interferometer and that can reduce wavefront aberration-measurement errors arising from such distortion. The apparatus comprise an interferometer that forms an interference fringe from a synthesis of a wavefront of light reflecting from a reference surface and a wavefront of light from a test object (such as a reflective surface or lens). The apparatus also comprises an image-pickup element for detecting the interference fringe, and an arithmetical calculator that calculates the wavefront aberration between the test object and the reference surface based on an output from the image-pickup element. Between the test object and the image-pickup element is an optical system (e.g., converging lens) that transmits a wavefront that is perpendicularly incident to a surface of the test object.

Abstract: A scroll compressor has a stationary scroll and a swivel scroll engaged with each other in a hermetic housing. A sealed terminal is provided to send signals outside of the housing from a sensor that is provided within the housing. The sealed terminal is inserted into a fitting hole that passes through the outer wall of the housing. A push nut having a plurality of nails is pressed into the fitting hole to hold the sealed terminal within the fitting hole. The push nut has a plurality of nails having an outer diameter slightly larger than the inner diameter of the fitting hole.

Abstract: A scroll type fluid machine has a stationary scroll 1 and a swivel scroll 2 engaged therewith contained within a hermetic housing 4. A plurality of legs 15 are provided on the outer circumferential edge of an end plate 11 of the stationary scroll 1, and are fixed by bolts 64 to a frame 5 supporting a rotating shaft 3 via a bearing 52. A rotation prevention mechanism 6 is interposed between the frame 5 and the swivel scroll 2. The swivel scroll 2 is connected to the rotating shaft 3 so as to make revolutional swivel motions. The diameter of the end plate 11 of the stationary scroll 1 is shortened, and thereby the hermetic housing 4 is made smaller. A cut out recess portion 25 is provided at each position corresponding to the plurality of legs 15 of the outer circumferential portion of a circular end plate 21 of the swivel scroll 2.

Abstract: A scroll fluid machine has a stationary scroll having a first end plate and a first spiral wrap projecting from one side of the first end plate. The first spiral wrap has a tip end. A swivel scroll has a second end plate and a second spiral wrap that projects from the one side of the second end plate. The second spiral wrap has a second end tip, and the first and second spiral wraps are engaged with each other. A first thin steel plate is provided on one side of the end plate between the first end plate and the second tip end. A first thin steel plate has a surface side that faces the second tip end. Further, a second thin steel plate is on one side of the second end plate between the second end plate and the first tip end. The second thin steel plate has a surface side that faces the first tip end. Both of the first and second thin steel plates are provided with conformable layers on the surfaces facing the tip ends.