摘要:
A method of manufacture of a surface acoustic wave device which includes a step of applying a photosensitive film resist on a substrate and forming a photosensitive film resist layer over at least a portion of a surface of the substrate; a step of forming acoustic absorbers only at the two sides orthogonal to the direction of the surface acoustic wave transmission; a step of placing in a package a surface acoustic wave element obtained by cutting and dividing the substrate and electrically connecting a connection electrode of the surface acoustic wave element with an external terminal of the package; and a step of sealing an opening of the package with a lid, wherein the main surface of the acoustic absorbers is formed parallel to the surface of the substrate.
摘要:
A SAW element (13) is formed of a piezoelectric substrate (14), on which are provided IDT electrodes (15), connection electrodes (16), underlying metal layers (17), and acoustic materials (18) placed on the underlying metal layers (17) and having surfaces parallel to the main surface of the piezoelectric substrate (14). The SAW element is mounted in a package (10), which is provided with external terminals (11) connected with the connection electrodes (16), and the package is hermetically sealed with a lid (20) to form a SAW device. When such a SAW element (13) is mounted faceup in a package (10) using a vacuum chuck (30), its piezoelectric substrate (14) can be protected against damage. When a SAW element (13) provided with bumps (23) on its connection electrodes (16) is mounted facedown in a package (10), the failure of electrical connections can be prevented.
摘要:
An electronic component having recesses on side faces of its package for housing an electric element therein. A metal layer that does not reach the bottom end of the package is formed on the surface of the recess. The metal layer has excellent wettability to a brazing material and helps extra material flow into the recess easily. In addition, the interface between the top end face of the recess and the side face is curved to make the brazing material flow into the recess easily. When the opening of the package is sealed with a lid using the brazing material, the extra brazing material flows into the recess. This prevents the brazing material from protruding outside of the package and thus improves dimensional accuracy of the electronic component. Therefore, mounting accuracy of the electronic component can be improved and short circuit can be prevented.
摘要:
An electronic component, in which a chip can be mounted on a certain predetermined place of the package at a high accuracy level, which package having a stepped level-difference in the inner wall of a cavity. The package is provided with a stepped level-difference in the inner wall surface, and an internal contact electrode formed on the upper surface of the stepped level-difference. At the bottom of the package is a shield electrode, on which a chip is mounted via an adhesion layer. The chip and the internal contact electrode are electrically connected by an interconnection wire. Location aligning for the chip and the interconnection wire, at least either one of these, is conducted by making use of a region, which is non-electrode portion, provided on the inner bottom surface of the package.
摘要:
An electronic component, in which a chip can be mounted on a certain predetermined place of the package at a high accuracy level, which package having a stepped level-difference in the inner wall of a cavity. The package is provided with a stepped level-difference in the inner wall surface, and an internal contact electrode formed on the upper surface of the stepped level-difference. At the bottom of the package is a shield electrode, on which a chip is mounted via an adhesion layer. The chip and the internal contact electrode are electrically connected by an interconnection wire. Location aligning for the chip and the interconnection wire, at least either one of these, is conducted by making use of a region, which is non-electrode portion, provided on the inner bottom surface of the package.
摘要:
An electronic component, in which a chip can be mounted on a certain predetermined place of the package at a high accuracy level, which package having a stepped level-difference in the inner wall of a cavity. The package 13 is provided with a stepped level-difference 26 in the inner wall surface, and an internal contact electrode 14 formed on the upper surface of the stepped level-difference 26. At the bottom of the package 13 is a shield electrode 15, on which a chip 17 is mounted via an adhesion layer 16. The chip 17 and the internal contact electrode 14 are electrically connected by an interconnection wire 19. Location aligning for the chip 17 and the interconnection wire 19, at least either one of these, is conducted by making use of a region 18a, 18b, which is non-electrode portion, provided on the inner bottom surface of the package 13.
摘要:
The purpose of the invention is to provide a disk driver which makes it easy for users to set the settings. In a device driver which operates in the computer and has a function where each item of the device is set, when the arrangement information stored in the memory corresponding to a user is read in, the screen shows a display in accordance with it. In the arrangement settings, the user can freely arrange each of the setting items on the screen. Then the arrangement information is maintained in the computer together with the user information.
摘要:
An ultrasonic imaging apparatus comprises an ultrasonic transducer for emitting an ultrasonic beam onto an interest region of a living body containing a blood flow and outputting an echo signal, a correlation circuit for determining a correlation of the signals obtained from the ultrasonic transducer and a velocity calculation circuit for calculating the velocity of the blood flow from the correlation data obtained by the correlation circuit. A zero shift process circuit zero-shifts the velocity data obtained from the velocity calculation circuit and compresses the zero-shifted velocity data in correspondance with an amount of zero shift. The zero-shifted flow velocity data is displayed within a possible display range.
摘要:
A composition for use as a self-locking agent is provided which comprises an aqueous dispersion of the following ingredients dissolved and dispersed in water: (a) a polyamide powder insoluble or slightly soluble in water, (b) an isocyanate compound, (c) a surfactant and (d) a water-soluble polyamide. The composition permits a polyamide resin layer of a smooth surface to be formed on a screw surface of a to-be-coated member. With use of the composition, it is possible to prevent slippage and sagging of the resin layer coated on the screw surface and improve the precision in resin coating processing.
摘要:
An endoscope including a scope for observing an object, in which at least one of sucking, gas feeding and liquid feeding operations is conducted at the scope, and a time elapsed after a start of the operation is detected by a time detector, and in which the time detected by the time detector is compared with a predetermined reference value, and then the operation is canceled by a canceling device when the time detected by the detected means is at least equal to the predetermined reference value.