Abstract: A method of manufacturing a CMUT transducer includes: a) forming a first silicon oxide layer on a face of a first silicon layer defining a first electrode of the transducer; b) forming a second silicon oxide layer on a face of a second silicon layer; c) subsequent to step a), forming, at the side of said face of the first silicon layer, by locally oxidizing the silicon of the first silicon layer, silicon oxide walls; and d) subsequent to steps b) and c), transferring and attaching the set comprising the second silicon layer and the second silicon oxide layer on the set comprising the first silicon layer, the first silicon oxide layer, and the silicon oxide walls.

Abstract: The scroll compressor comprises a fixed scroll having a fixed end plate and a fixed spiral wrap extending from the fixed end plate; an orbiting scroll (9) having an orbiting end plate and an orbiting spiral wrap extending from the orbiting end plate, the fixed spiral wrap and the orbiting spiral wrap meshing with each other to form compression chambers; a vertical drive shaft (19) having a crankpin (21) at an upper end portion of the vertical drive shaft (19), the crankpin (21) including an outer circumferential surface (23) cooperating with an orbiting scroll bearing (24). The crankpin (21) includes a recess (25) formed in an axial end face (26) of the crankpin (21), the recess (25) and an upper portion (27) of the outer circumferential surface (23) defining therebetween a circumferential wall (28) extending along at least a part of the circumference of the crankpin (21), the circumferential wall (28) being deformable in a radial direction during operation of the scroll compressor.

Abstract: The present disclosure relates to a CUT transducer (200) comprising: —a conductive or semiconductor substrate (201) coated with a stack of one or a plurality of dielectric layers (203, 213); —a cavity (205, 215) formed in said stack; —a conductive or semiconductor membrane (221) suspended above the cavity; —at the bottom of the cavity, a conductive region (209) in contact with the upper surface of the substrate, said conductive region being interrupted on a portion of the upper surface of the substrate; and—in the cavity, a stop structure (207) made of a dielectric material localized on or above the area of interruption of the conductive region (209).

Abstract: An ultrasonic device, comprising an ultrasonic transducer (400) comprising: a membrane (405) suspended above a cavity (403) arranged on the upper surface side of a substrate (401); a piezoelectric layer (407) attached to a surface of the membrane (405); a first electrode (E1) arranged on the lower surface side of the cavity (403); and a second electrode (E3) arranged on the upper surface side of the cavity (403), in contact with the piezoelectric layer (407), the device further comprising a control circuit (CTRL) connected to the first (E1) and second (E3) electrodes and capable of applying a first control voltage (VDC) on the first electrode (E1), and a second control voltage (VAC) different from the first voltage on the second electrode (E3).

Abstract: The present disclosure relates to a method of simultaneous manufacturing, from a same substrate (101), at least one first CMUT transducer (I) having a first resonance frequency and at least one second CMUT transducer (II) having a second resonance frequency different from the first frequency, the method comprising the steps of: a) for each transducer (I, II), forming a cavity (103) on the upper surface side of the substrate, and forming a flexible membrane (105) suspended above the cavity (103); b) forming a first layer (109) extending over a portion only of the upper surface of the membrane (105) of the first transducer (I) and which does not extend over the membrane (105) of the second transducer (II); and c) forming a second layer (111) extending over the entire upper surface of the membrane (105) of the first transducer and over the entire upper surface of the membrane of the second transducer.

Abstract: The present disclosure relates to a method of manufacturing a CMUT transducer, comprising the steps of: a) forming a first dielectric layer on a first substrate; b) forming a second dielectric layer on a second substrate; c) forming a cavity in the first or second dielectric layer; d) assembling the first and second substrates by direct bonding of the surface of the second dielectric layer opposite to the second substrate to the surface of the first dielectric layer 103) opposite to the first substrate; e) removing the second substrate to only keep above the cavity a suspended membrane formed by the second dielectric layer; and f) forming an upper electrode on the surface of the membrane opposite to the first substrate.

Abstract: The present disclosure relates to a CMUT transducer (200) comprising: a substrate (101) coated with a dielectric layer (103); a cavity (105) formed in the dielectric layer (103); a conductive or semiconductor membrane (107) suspended above the cavity (105); and a dielectric coating (104) arranged on an upper surface of the substrate (101) at the bottom of the cavity or on a lower surface of the membrane at the top of the cavity and extending, in top view, on the most part of the surface of the cavity (105), wherein the dielectric coating (104) is structured opposite the cavity (105).

Abstract: The scroll compressor (2) including a hermetic enclosure (3), a compression unit (11) configured to compress refrigerant, and an electric motor (16) configured to drive the compression unit (11) via a drive shaft (15), the hermetic enclosure (3) including a midshell (4), an upper cap (5) and a baseplate (6), the baseplate (6) including a mounting base (24) having a plate shape and including a central portion, and a cylindrical rim surrounding the central portion and extending upwardly, the cylindrical rim (28) being secured to the mounting base (24) by a double-welded T-joint (29), the double-welded T-joint (29) including an inner welding seam connecting an inner surface of the cylindrical rim (28) to the mounting base (24), and an outer welding seam connecting an outer surface of the cylindrical rim (28) to the mounting base (24).

Abstract: The scroll compressor comprises a fixed scroll having a fixed end plate and a fixed spiral wrap extending from the fixed end plate; an orbiting scroll (9) having an orbiting end plate and an orbiting spiral wrap extending from the orbiting end plate, the fixed spiral wrap and the orbiting spiral wrap meshing with each other to form compression chambers; a vertical drive shaft (19) having a crankpin (21) at an upper end portion of the vertical drive shaft (19), the crankpin (21) including an outer circumferential surface (23) cooperating with an orbiting scroll bearing (24). The crankpin (21) includes a recess (25) formed in an axial end face (26) of the crankpin (21), the recess (25) and an upper portion (27) of the outer circumferential surface (23) defining therebetween a circumferential wall (28) extending along at least a part of the circumference of the crankpin (21), the circumferential wall (28) being deformable in a radial direction during operation of the scroll compressor.

Abstract: The scroll compression device includes a first scroll element (11) having a first base plate (13) and a first spiral wrap (14); a second scroll element (12) having a second base plate (15) and a second spiral wrap (16), one of the first and second scroll elements (11, 12) being configured to perform an orbiting movement in relation to the other one of the first and second scroll elements, the first and second scroll elements (11, 12) intermeshing with each other and delimiting compression chambers (17); and a sealing device (28) arranged in an end face (19) of the first spiral wrap (14) and having a sealing surface configured to cooperate with the second base plate (15).

Abstract: A capacitive micromachined ultrasonic transducer including a lower electrode, an upper electrode, and a membrane attached to the upper electrode and positioned between the lower electrode and the upper electrode. Anchors are connect to the membrane and the lower electrode such that a cavity is defined between the lower electrode and the membrane. One or more posts are positioned within the cavity, the posts partially buried within the membrane and extending towards the lower electrode. A method of producing a capacitive micromachined ultrasonic transducer includes forming an oxide growth layer on a device layer of undoped silicon and removing portions of the oxide growth layer to form anchors extending beyond the outer surface of the device layer and posts partially buried within post holes in the device layer and extending beyond the outer surface of the device layer.

Abstract: The scroll compression device includes a first scroll element (11) having a first base plate (13) and a first spiral wrap (14); a second scroll element (12) having a second base plate (15) and a second spiral wrap (16), one of the first and second scroll elements (11, 12) being configured to perform an orbiting movement in relation to the other one of the first and second scroll elements, the first and second scroll elements (11, 12) intermeshing with each other and delimiting compression chambers (17); and a sealing device (28) arranged in an end face (19) of the first spiral wrap (14) and having a sealing surface configured to cooperate with the second base plate (15).

Abstract: The scroll refrigeration compressor according to the invention includes a sealed enclosure at least partially defining a discharge chamber designed to be connected to a discharge line, and a discharge valve attached on the sealed enclosure and fluidly connected to the discharge chamber. The discharge valve includes a valve body, a valve seat, and a discharge check valve movable between a covering position and a released position. The discharge valve includes deflection means positioned in the valve body and arranged to orient the flow of refrigerant coming from the discharge line at least partially toward the periphery of the discharge check valve.

Abstract: The scroll compressor includes stationary and moving volutes each including a scroll plate provided with a spiral wrap, the spiral wraps defining the variable-volume compression chambers, a delivery conduit including a first end emerging in a central compression chamber and a second end designed to be communicated with a delivery chamber, a delivery valve movable between closing and opening positions for closing and opening at least one delivery opening arranged to communicate the delivery conduit and the delivery chamber, at least one bypass valve associated with a bypass passage arranged to communicate the delivery chamber with an intermediate compression chamber. The compressor includes a retaining plate mounted on the scroll plate of the stationary scroll and on which first and second retaining elements are formed, the latter being arranged to limit respectively the amplitude of movement of the delivery valve and of each bypass valve toward the opening position thereof.

Abstract: The scroll compressor includes stationary and moving scrolls each including a scroll plate provided with a spiral wrap, the spiral wraps defining the variable-volume compression chambers, a separating plate mounted on the scroll plate of the stationary scroll and defining with the latter a first intermediate volume, and a delivery chamber defined by the separating plate and the sealed casing. The compressor includes a bypass passage arranged to communicate the first intermediate volume with an intermediate compression chamber, a flow passage arranged to communicate the first intermediate volume with the delivery chamber, and a bypass valve associated with the flow passage, each bypass valve associated with a flow passage mounted on the surface of the separating plate turned toward the delivery chamber and movable between closing and opening positions for closing and opening the flow passage.

Abstract: The scroll refrigeration compressor includes a stationary volute and a moving volute provided with spiral wraps defining variable-volume compression chambers, a separating member sealably mounted on a plate of the stationary volute so as to allow a relative movement between the separating member and the stationary volute, a delivery chamber at least partially defined by the separating member and the sealed casing. The compressor further includes a bypass passage arranged to communicate the delivery chamber with an intermediate compression chamber, and a anti-return device comprising a closing member movable between closing and opening positions for closing and opening the bypass passage, and an enclosure, positioned between the separating member and the plate of the stationary volute, including a first portion sealably mounted in a housing defined by the separating member and oriented substantially parallel to the longitudinal axis of the compressor.

Abstract: The scroll compressor includes stationary and moving volutes each including a scroll plate provided with a spiral wrap, the spiral wraps defining the variable-volume compression chambers, a delivery conduit including a first end emerging in a central compression chamber and a second end designed to be communicated with a delivery chamber, a delivery valve movable between closing and opening positions for closing and opening at least one delivery opening arranged to communicate the delivery conduit and the delivery chamber, at least one bypass valve associated with a bypass passage arranged to communicate the delivery chamber with an intermediate compression chamber. The compressor includes a retaining plate mounted on the scroll plate of the stationary scroll and on which first and second retaining elements are formed, the latter being arranged to limit respectively the amplitude of movement of the delivery valve and of each bypass valve toward the opening position thereof.

Abstract: The scroll compressor includes stationary and moving scrolls each including a scroll plate provided with a spiral wrap, the spiral wraps defining the variable-volume compression chambers, a separating plate mounted on the scroll plate of the stationary scroll and defining with the latter a first intermediate volume, and a delivery chamber defined by the separating plate and the sealed casing. The compressor includes a bypass passage arranged to communicate the first intermediate volume with an intermediate compression chamber, a flow passage arranged to communicate the first intermediate volume with the delivery chamber, and a bypass valve associated with the flow passage, each bypass valve associated with a flow passage mounted on the surface of the separating plate turned toward the delivery chamber and movable between closing and opening positions for closing and opening the flow passage.

Abstract: The scroll refrigeration compressor includes a stationary volute and a moving volute provided with spiral wraps defining variable-volume compression chambers, a separating member sealably mounted on a plate of the stationary volute so as to allow a relative movement between the separating member and the stationary volute, a delivery chamber at least partially defined by the separating member and the sealed casing. The compressor further includes a bypass passage arranged to communicate the delivery chamber with an intermediate compression chamber, and a anti-return device comprising a closing member movable between closing and opening positions for closing and opening the bypass passage, and an enclosure, positioned between the separating member and the plate of the stationary volute, including a first portion sealably mounted in a housing defined by the separating member and oriented substantially parallel to the longitudinal axis of the compressor.

Abstract: Compressor has a fixed scroll and a scroll movable in an orbit relative to the fixed scroll. The fixed and movable scrolls are equipped with a spiral wrap that engage each other and delimit variable-volume compression chambers. The spiral wrap of the movable scroll has a stepped portion extending over at least a portion of its length. At least one of the scrolls defines a passage for communication, during orbital movement of the movable scroll, between two compression chambers, with the ends of the passage terminating respectively on either side of the outer and inner walls of the spiral wrap of the scroll with the passage or inside the outer and inner walls of the spiral wrap of the scroll with the passage. The passage has a check valve for allowing fluid to flow only from the outer wall of the spiral wrap of the scroll with the passage to the inner wall.