Abstract:
A MEMS device includes a first substrate and a second substrate that is disposed laminated on the first substrate and has a piezoelectric element on the first substrate side, in which the first substrate and the second substrate are substantially the same size, and in planar view, an end of the first substrate and an end of the second substrate are disposed at substantially the same position.
Abstract:
A substrate plate is provided for at least one MEMS device to be mounted thereon. The MEMS device has a certain footprint on the substrate plate, and the substrate plate has a pattern of electrically conductive leads to be connected to electric components of the MEMS device. The pattern forms contact pads within the footprint of the MEMS device and includes at least one lead structure that extends on the substrate plate outside of the footprint of the MEMS device and connects a number of the contact pads to an extra contact pad. The lead structure is a shunt bar that interconnects a plurality of contact pads of the MEMS device and is arranged to be removed by means of a dicing cut separating the substrate plate into a plurality of chip-sized units. At least a major part of the extra contact pad is formed within the footprint of one of the MEMS devices.
Abstract:
We describe a method of layer-by-layer deposition of a plurality of layers of material onto the wall or walls of a channel of a microfluidic device, the method comprising: loading a tube with a series of segments of solution, a said segment of solution bearing a material to be deposited; coupling said tube to said microfluidic device; and injecting said segments of solution into said microfluidic device such that said segments of solution pass, in turn, through said channel depositing successive layers of material to perform said layer-by-layer deposition onto said wall or walls of said channel. Embodiments of the methods are particularly useful for automated surface modification of plastic, for example PDMS (Poly(dimethylsiloxane)), microchannels. We also describe methods and apparatus for forming double-emulsions.
Abstract:
A substrate processing method for forming a through-hole in a substrate by reactive ion etching includes preparing a substrate that has a first surface and a second surface and on the first surface side of which a first layer and a second layer are disposed, the second surface being on the opposite side to the first surface, the second layer covering the first layer; and performing reactive ion etching on the substrate from the second surface to form a through-hole extending through the substrate from the first surface to the second surface, the reactive ion etching being performed to reach the first layer. The etching rate of the second layer for the reactive ion etching is lower than that of the first layer.
Abstract:
A silicon structure of the present invention is provided with a silicon substrate (1) to become a base, and a plurality of fibrous projections (2) made of silicon dioxide and directly joined to a silicon-made surface (1a) of the silicon substrate (1). By arbitrarily constructing an area where these fibrous projections (2) are formed in a predetermined area, it is possible to render the area to have at least either hydrophilicity or water retentivity, so as to provide a silicon structure useful for a variety of devices.
Abstract:
A liquid ejection head substrate including a silicon substrate having a liquid supply port as hollow and slots as through holes connecting the hollow and a liquid channel arranged opposite sides of the substrate. The method includes etching the substrate to form the hollow; forming a first resist on the hollow; etching the first resist on the bottom of the hollow under conditions of securing an equal etching rate to both the silicon substrate and the first resist; forming a second resist on the hollow; patterning the second resist into an etching mask; and etching the substrate using the etching mask to form the through holes.
Abstract:
A liquid ejection head substrate including a silicon substrate having a liquid supply port as hollow and slots as through holes connecting the hollow and a liquid channel arranged opposite sides of the substrate. The method includes etching the substrate to form the hollow; forming a first resist on the hollow; etching the first resist on the bottom of the hollow under conditions of securing an equal etching rate to both the silicon substrate and the first resist; forming a second resist on the hollow; patterning the second resist into an etching mask; and etching the substrate using the etching mask to form the through holes.
Abstract:
A method of etching backside ink supply channels for an inkjet printhead. The method includes the steps of: (a) attaching a frontside of the printhead to a handle wafer; (b) etching the backside of the printhead using an anisotropic DRIE process to form a plurality of ink supply channels, the DRIE process including alternating etching and passivation steps, the passivation steps depositing a polymeric coating on sidewalls of the ink supply channels; and (c) removing the polymeric coating by etching the backside of the printhead in a biased plasma etching chamber using an O2 plasma. The chamber temperature is in the range of 90 to 180° C.
Abstract:
An integrated semiconductor heating assembly includes a semiconductor substrate, a chamber formed therein, and an exit port in fluid communication with the chamber, allowing fluid to exit the chamber in response to heating the chamber. The integrated heating assembly includes a first heating element adjacent the chamber, which can generate heat above a selected threshold and bias fluid in the chamber toward the exit port. A second heating element is positioned adjacent the exit port to generate heat above a selected threshold, facilitating movement of the fluid through the exit port away from the chamber. Addition of the second heating element reduces the amount of heat emitted per heating element and minimizes thickness of a heat absorption material toward an open end of the exit port. Since such material is expensive, this reduces the manufacturing cost and retail price of the assembly while improving efficiency and longevity thereof.
Abstract:
A method of micro-machining a semiconductor substrate to form one or more through slots therein. The semiconductor substrate has a device side and a fluid side opposite the device side. The method includes diffusing a p-type doping material into the device side of the semiconductor substrate in one or more through slot locations to be etched through a thickness of the substrates. The semiconductor substrate is then etched with a dry etch process from the device side of the substrate to the fluid side of the substrate so that one or more through slots having a reentrant profile are formed in the substrate.