Presented is a method, apparatus and computer-readable medium for reducing error. The apparatus includes a rotatable element having a plurality of spaced light modifying ports located at set positions in the rotatable element, the rotatable element rotatable about an axis. The apparatus further includes a drive engagedly coupled to the rotatable element to rotate the rotatable element, wherein one periodic cycle of the rotatable element is an integer number of periodic cycles of the drive.

Presented is a method, apparatus and computer-readable medium for reducing error. The apparatus includes a rotatable element having a plurality of spaced light modifying ports located at set positions in the rotatable element, the rotatable element rotatable about an axis. The apparatus further includes a drive engagedly coupled to the rotatable element to rotate the rotatable element, wherein one periodic cycle of the rotatable element is an integer number of periodic cycles of the drive.

A protective device protective shell includes a detachable external lens. A lens holder is positioned on the pivot positioning member and coupled to the housing body, and the first elastic member is axially disposed along the pivot positioning member, so that the lens holder only needs to overcome the first positioning portion when rotating around the pivot positioning member. The static friction force between the first mating positioning portions and the biasing force of the first elastic member avoids generating a rotational moment to the first elastic member, thereby preventing the first elastic member from being damaged due to the rotational moment, thereby making the lens holder rotate more smoothly. The sliding is used to greatly extend the service life of the protective casing of the external lens shooting device of aspects of the invention, and the structure thereof is simple, thereby saving production cost.

An additive manufacturing system including a two-dimensional energy patterning system for imaging a powder bed is disclosed. Improved chamber designs, multiple chambers, powder handling and re-use systems, and powder characterization methods are disclosed.

An additive manufacturing system including a two-dimensional energy patterning system for imaging a powder bed is disclosed. Improved chamber designs, multiple chambers, powder handling and re-use systems, and powder characterization methods are disclosed.

A microscope can be retrofitted with a nosepiece configured with a miniaturized inertial measurement sensor and an associated wireless transmitter that functions to relay information as to the current position of the nosepiece as determined by the inertial measurement sensor thereby indicating which objective lens is in the optical path to an external computing device. Alternatively, the nosepiece can configured with a miniaturized inertial measurement sensor generating an electrical signal indicating the current position of the nosepiece or equivalently the current objective lens in the optical path, and a cable for carrying power to the sensor, the electrical signal to internal electronics of the microscope, or both. This latter configuration is suitable in the situation where the microscope is configured with this arrangement, as manufactured.

Additive manufacturing can involve dispensing a powdered material to form a layer of a powder bed on a support surface of a build platform. A portion of the layer of the powder bed may be selectively melted or fused to form one or more temporary walls out of the fused portion of the layer of the powder bed to contain another portion of the layer of the powder bed on the build platform

Additive manufacturing can involve dispensing a powdered material to form a layer of a powder bed on a support surface of a build platform. A portion of the layer of the powder bed may be selectively melted or fused to form one or more temporary walls out of the fused portion of the layer of the powder bed to contain another portion of the layer of the powder bed on the build platform

Additive manufacturing can involve dispensing a powdered material to form a layer of a powder bed on a support surface of a build platform. A portion of the layer of the powder bed may be selectively melted or fused to form one or more temporary walls out of the fused portion of the layer of the powder bed to contain another portion of the layer of the powder bed on the build platform.

Additive manufacturing can involve dispensing a powdered material to form a layer of a powder bed on a support surface of a build platform. A portion of the layer of the powder bed may be selectively melted or fused to form one or more temporary walls out of the fused portion of the layer of the powder bed to contain another portion of the layer of the powder bed on the build platform.