摘要:
The invention relates to a manufacturing method for a membrane mask suitable for particle beams with mask fields, which are bounded by thin support walls.The deep plasma etching for the formation of the support walls is halted shortly before reaching the membrane and the last .mu.m before the membrane removed by wet-chemical etching. A high etch selectivity can be achieved using an alkaline etching solution.The support walls 1 are turned by 45.degree. to the (110) direction or oriented parallel to the (100) plane, so that the structures restricted by (111) planes are avoided.
摘要:
The invention relates to calibration standards which are used chiefly for the calibration of profilometers and in atomic force- and scanning probe microscopes. The calibration standard has one step of defined height H or a multi-step system formed of several steps of the same step-height H and consisting of exactly one material. The manufacturing procedure for the calibration standard requires only a single masking layer for each of the different versions in the form of a one-step standard or a multi-step system.
摘要:
Disclosed is a reproducible process for making an SiO.sub.2 layer by thermal oxidation which assures an extremely uniform thickness of the SiO.sub.2 layer of approximately 1%. The process of the invention comprises the steps growing an initial layer of SiO.sub.2 to a defined minimal thickness by dry oxidation and increasing the thickness of the initial layer by simultaneous wet and dry oxidation until the desired final thickness is reached.
摘要:
The invention relates to a contact probe arrangement for electrically connecting a test system with contact pads of a device to be tested. The contact probes are located in guide grooves. The guide grooves as well as areas are provided in a plane parallel to the surface of a guide plate and are covered by a protective plate. The contact probes may bend out laterally into the respective areas. This assures a very dense contact probe array. Contact probe arrays of this type may be used, for example, for detecting opens and shorts in integrated circuits or semiconductor chips. The invention overcomes the problem of adjusting for height differences in the contact pads caused by an uneven surface of the device to be tested.
摘要:
Adjacent shaped grooves are placed in single crystal structure with great accuracy and known dimensions by a combination of anisotropic and isotropic etching to produce a scanning probe microscope calibration standard with fine V-shaped grooves forming a prismatically shaped ridge or blade between them. A probe microscope to be calibrated is used to profile the tip of the ridge in a number of places along the length of the ridge. With knowledge of the sidewall angles and tip radius of the calibration standard both the flat tip dimensions of a probe with a flared tip and the tip radius of a probe with a conical tip can be calculated from the profile they produce.
摘要:
Membrane masks for electron-beam lithography are described which have a high mechanical stability and low membrane thickness, are free of stress and the submicron structures of which are easy to produce using reactive ion etching methods without rounding effects.In the case of a membrane mask for structuring surface areas with the aid of electron or corpuscular beams, a layer 1 of silicon nitride with going right through openings, which define the mask pattern, is deposited on one surface of a semiconductor wafer 2, which consists preferably of silicon. A tub-shaped recess 3 extends from the other surface of the semiconductor wafer 2 as far as the layer-carrying surface.A further mask for structuring surface areas with the aid of electron beams has at least one continuous layer 30 and a layer 31 defining the mask pattern.These two layers are deposited on the surface of a semiconductor wafer 32 with a tub-shaped recess 33.The anisotropic plasma etching method according to the invention makes it possible to transfer lithographically produced patterns to the membrane without the edge rounding which is otherwise usual.
摘要:
The supporting plate and the bulk removal, transport and storage fixture for small batch-fabricated devices (1) have openings (2) penetrating from the top side (3) to the bottom side (4) of the plate and raised retaining means (5) on the bottom side (4). The raised retaining means (5) are provided in sufficient number and are arranged according to the shape of the devices (1) for retaining the devices. Flange means (7) which are designed for providing vacuum or agents to the devices (1) on the supporting plate are connected to the supporting plate thus forming a fixture. By changing the arrangement of the raised retaining means (5) and/or the openings (2) the supporting plate and the fixture may easily be adapted to different sizes and kinds of devices.
摘要:
A system, method and computer program product for steering a time-of-day (TOD) clock for a computer system having a physical clock providing a time base for executing operations that is stepped to a common oscillator. The method includes computing a TOD-clock offset value (d) to be added to a physical-clock value (Tr) value to obtain a logical TOD-clock value (Tb), where the logical TOD-clock value is adjustable without adjusting a stepping rate of the oscillator.
摘要:
The management of data access is facilitated. A loop only if changed locking facility is provided, in which reads and updates of the data being managed are permitted, unless an update to the data completes during the execution of the read or update routine. As long as an update to the data has not completed during a processor's execution of the read or update routine, access is permitted.
摘要:
An actuating arrangement for a Bowden cable, in particular in a vehicle, includes a bracket which can be fastened to a wall and a lever arrangement which is pivotally fastened to the bracket and includes a lever member and a cable coupling for one end of the Bowden cable. To provide improved installation conditions and a concealed arrangement of the Bowden cable, the lever member and the cable connector are separate parts which can be connected to each other in a rotationally fixed relation after the assembly consisting of the bracket and cable coupling has been fastened to the wall.