摘要:
A spacer and a method for its use in an outer wall of a building between the outer vertical surface of its underlying structure and the inner surfaces of each of the portions of overlapped lengths of siding through which the lengths of siding are nailed to the underlying structure to provide a ventilation space between the rear surfaces of the lengths of siding and the outer surface of the underlying structure. The spacers each have a planer rear surface adapted to be positioned against the outer surface of the underlying structure, and a planer front surface portion that can be disposed at a small acute angle (e.g., in the range of about 2 to 3 degrees) with respect to the rear surface at which angle it is desired to have the rear surfaces of the lengths of siding disposed with respect to the outer surface of the underlying structure. A ventilation channel can be provided between a lower horizontal surface on the building and an uppermost edge of its siding to facilitate movement of air to the atmosphere from such a ventilation space transversely through the ventilation channel and openings in a perforated wall portion of the ventilation channel.
摘要:
A spacer and a method for its use in an outer wall of a building between the outer vertical surface of its underlying structure and the inner surfaces of each of the portions of overlapped lengths of siding through which the lengths of siding are nailed to the underlying structure to provide a ventilation space between the rear surfaces of the lengths of siding and the outer surface of the underlying structure. The spacers each have a planer rear surface adapted to be positioned against the outer surface of the underlying structure, and a planer front surface portion that can be disposed at a small acute angle with respect to the rear surface at which angle it is desired to have the rear surfaces of the lengths of siding disposed with respect to the outer surface of the underlying structure. Ventilation channels can be provided at both the lower and upper ends of the ventilation space to facilitate movement of air to the atmosphere from such a ventilation space.
摘要:
A laser pulse with a specially tailored temporal power profile, instead of a conventional temporal shape or substantially square shape, severs an IC link. The specially tailored laser pulse preferably has either an overshoot at the beginning of the laser pulse or a spike peak within the duration of the laser pulse. The timing of the spike peak is preferably set ahead of the time when the link is mostly removed. A specially tailored laser pulse power profile allows the use of a wider laser pulse energy range and shorter laser wavelengths, such as the green and UV, to sever the links without appreciable damage to the substrate and passivation structure material located on either side of and underlying the links.
摘要:
A semi-conductor wafer processing information system which includes a sensor responsive to the presence of a wafer at a monitored location of a processing machine to read the wafer identification scribe and send both wafer and machine identification signals to a host computer which may be independent of a wafer tracking system. The computer determines whether processing at the selected machine is appropriate. Wafer history information is updated when the wafer departs a given machine.
摘要:
Digital control of frequency and/or amplitude modulation techniques of an intracavity and/or extracavity AOM (60) facilitate substantially full extinction of a laser beam (90) to prevent unwanted laser energy from impinging a workpiece (80); facilitate laser pulse amplitude stability through closed-loop control of pulse-to-pulse laser energy; facilitate beam-positioning control including, but not limited to, closed-loop control for applications such as alignment error correction, beam walk rectification, or tertiary positioning; and facilitate employment of more than one transducer on an AOM (60) to perform any of the above-listed applications.
摘要:
Digital control of frequency and/or amplitude modulation techniques of an intracavity and/or extracavity AOM (60) facilitate substantially full extinction of a laser beam (90) to prevent unwanted laser energy from impinging a workpiece (80); facilitate laser pulse amplitude stability through closed-loop control of pulse-to-pulse laser energy; facilitate beam-positioning control including, but not limited to, closed-loop control for applications such as alignment error correction, beam walk rectification, or tertiary positioning; and facilitate employment of more than one transducer on an AOM (60) to perform any of the above-listed applications.
摘要:
Digital control of frequency and/or amplitude modulation techniques of an intracavity and/or extracavity AOM (60) facilitate substantially full extinction of a laser beam (90) to prevent unwanted laser energy from impinging a workpiece (80); facilitate laser pulse amplitude stability through closed-loop control of pulse-to-pulse laser energy; facilitate beam-positioning control including, but not limited to, closed-loop control for applications such as alignment error correction, beam walk rectification, or tertiary positioning; and facilitate employment of more than one transducer on an AOM (60) to perform any of the above-listed applications.
摘要:
A technique and process for clamping, sealing and aiding in the filling of fiberglass or other types of matched low pressure molds. An air-impervious bag is placed about the male and female molds and is sealed. A vacuum is then produced within the bag in such a manner as to fix the molds firmly together while sealing the mold parting line and whereupon a predetermined amount of molding material is injected within the mold cavity.
摘要:
A technique for the manufacture of a resin-impregnated, reinforced article while resin fumes are prevented from escaping into the surrounding atmosphere. In this technique a permeable reinforcing material, for example of fiberglass, is deposited on a mold or on a structure to be reinforced; a sheet of perforated material (preferably flexible) is placed over the reinforcing material, with the marginal areas of this sheet preferably sealed to the mold so as to define an inner chamber; a sheet of impervious flexible material is placed over the sheet of perforated material, with the marginal areas of the impervious sheet sealed to the mold so as to define an outer chamber; the inner chamber is effectively connected to a vacuum source so as to draw the impervious sheet and, along with it the perforated sheet, against the reinforcing material; and the outer chamber is connected to a source of catalyzed resin so that resin is passed from the outer chamber into the reinforcing material through the perforations of the first-mentioned sheet. In this manner the material is substantially evenly impregnated with resin without the escape of resin fumes into the surrounding atmosphere. The articles thus produced are stronger because the reinforcement-to-resin ratio is enhanced. Also, interface adhesion and air inhibiting problems are avoided. A wide range of laminates may be used with this technique and it is suitable in connection with molds and structures of widely different shapes and sizes.
摘要:
A mold for making dry cast concrete blocks includes a pair of vertical shoulder forming sections, one along each of the opposite sides of the mold to form vertical front shoulders of a block. Each shoulder forming section has a shoulder roughening arrangement to result in molded, roughened shoulders of the block. Methods of making such blocks and the resulting block are included.