68 results about "Perfboard" patented technology

Flexible abrasive sheet articles having precision thickness flat-topped raised island structures that are coated with a monolayer of equal sized abrasive agglomerate are described. Methods of producing high quality equal-sized spherical shaped composite abrasive agglomerate beads containing small diamond abrasive particles are described. Beads are produced by level-filling fine mesh screens or perforated sheets with a water based metal oxide slurry containing abrasive particles and then using a fluid jet to eject the abrasive slurry lumps from the individual screen cells into a dehydrating environment. Surface tension forces form the ejected liquid lumps into spheres that are solidified and then heated in a furnace to form ceramic beads. These porous ceramic abrasive beads can be bonded directly onto the flat planar surface of a flexible backing material or they can be bonded onto raised island surfaces to form rectangular or disk abrasive sheet articles. Abrasive articles having equal sized abrasive beads are particularly suited for lapping and raised island articles are suited for high speed lapping. Non-abrasive equal-sized beads can also be formed using this simple bead manufacturing process, which requires only a very low capital investment.

Improved impact proof capability of a silicon microphone sensing element is achieved with a stopper element that limits the maximum vibration of moveable parts. The stopper has a lower anchor portion and upper finger portion that is elevated a certain distance above the diaphragm and overhangs the outer edges of the perforated plates. The stopper is formed on a stack consisting of a lower substrate, a middle dielectric layer, and an upper membrane layer. There is a back hole in the substrate and an air gap in the dielectric layer to allow sound to impinge on the diaphragm. The number of fingers and composition of the stopper is variable. Optionally, the stopper has a center support design and is formed on a center anchor within an opening in the diaphragm. An upper finger region overhangs the diaphragm near the center opening and thereby prevents breakage due to large vibrations.

A chucking device is provided, the chucking device having low dusting characteristics and high detergent properties, and being capable of vacuum-sucking even a substrate having a large warpage, and a chucking method using the chucking device is also provided. The chucking device vacuum-sucks and holds a wafer. The chucking device includes a perforated plate having a plurality of through-holes and being mounted with a wafer, the through-holes penetrating through both sides of the perforated plate; a porous plate that supports a surface other than a mounting surface of the perforated plate, on which the wafer is mounted, transmits a vacuum state to the wafer through the plurality of through-holes, and has a pore to limit a flow rate; and a vacuum pump that exhausts an air through the pore of the porous plate.

The invention relates to the technical field of airflow sound elimination, and discloses a novel micro-perforated plate muffler with barbed triangular micro-perforation. The micro-perforated plate muffler includes a shell, the shell internally sleeves two micro-perforated plates in a sealed mode through a sealing tape, the two micro-perforated plates are mutually symmetrical with the center line of the vertical direction of the shell as the axis of symmetry, the left side and the right side of the inner wall of the shell sleeve an air outlet pipeline and an air inlet pipeline correspondingly,and the right end of the air inlet pipeline penetrates through the shell and extends to the right side of the shell. According to the novel micro-perforated plate muffler with barbed triangular micro-perforation, a clockwise thread and a counterclockwise thread with opposite grains are formed in a distance adjusting device, a user conveniently and simultaneously adjusts and controls the distance between the two micro-perforated plates and the adjacent side of the shell according to the volume of a noise source and the audio frequency, by adjusting and controlling the depth of an inner cavity,noise and audio with different sizes are silenced conveniently, and the applicability of the novel micro-perforated panel muffler to noise reduction of different volume and different audio frequency is improved.

An interchangeable fastener system for use in combination with a perforated board or other surface on a vertical plane includes a main fastener including a base for supporting the main fastener on the perforated board; the base surrounding a channel defined by an inner surface including opposing ramp surfaces to facilitate tightening of an attachment member, and a mechanical stop adjacent each ramp surface to prevent over rotation of the attachment member; and the attachment member including an elongate member having opposing ends, wherein the elongate member is sized and configured for selective passage through the channel from the front surface through the rear surface and wherein the attachment member may be selectively rotated so that opposing ends of the elongate member are each in engaged abutment against a corresponding one of the opposing ramp surfaces and mechanical stops.

Disclosed herein is a composite panel for sound absorption that may absorb and block noise. The composite panel may include: a first perforated panel comprising first embosses and first perforation groups formed in a predetermined pattern, wherein the first embosses are formed by forming a plurality of cells and the first perforation groups are formed by collecting a plurality of first perforated holes; an embossed panel comprising second embosses formed by forming the plurality of cells and coupled to the first perforated panel wherein the embossed panel is laminated with the first perforated panel; and a sound absorbing and insulating material inserted between the first perforated panel and the embossed panel.