Abstract: A flat jet nozzle arrangement is provided, including a liquid nozzle part for dispensing a fan-shaped liquid jet defining a jet plane and a jet guidance part, and wherein the jet guidance part includes a through-channel having a liquid receiving portion, which receives the liquid jet and which is adjoined by a liquid dispensing portion that widens in the jet plane, and wherein the flat jet nozzle arrangement includes at least one air intake opening, which is in flow connection with the liquid receiving portion. In order to further develop the flat jet nozzle arrangement so that the ambient air impairs the liquid jet to a lesser extent, the liquid dispensing portion includes a longitudinal region, which extends at least over a portion of its total length and in which the liquid dispensing portion narrows perpendicularly to the jet plane with increasing distance from the liquid receiving portion.

Abstract: The present invention relates to a measuring device (10) and a method for determining a depth of field of an optical structure (100). In this case, the measuring device comprises a device body (12) with a measuring axis (14), the device body (12) being formed such that, in a measuring position, it can be placed in a stationary manner on a deposit plane of the optical structure such that the measuring axis (14) of the device body (12) coincides with an optical axis of the optical structure, wherein the device body (12) has a measurement scale (18) arranged along a scale line (16) such that the scale line (16) encloses with the direction of the measuring axis (14) a scale angle ? greater than 0° and less than 90° and the measurement scale (18) can be optically detected in the measuring position of the device body (12) by the optical structure (100) for determining the depth of field.

Abstract: The present invention relates to a measuring device (10) and a method for determining a depth of field of an optical structure (100). In this case, the measuring device comprises a device body (12) with a measuring axis (14), the device body (12) being formed such that, in a measuring position, it can be placed in a stationary manner on a deposit plane of the optical structure such that the measuring axis (14) of the device body (12) coincides with an optical axis of the optical structure, wherein the device body (12) has a measurement scale (18) arranged along a scale line (16) such that the scale line (16) encloses with the direction of the measuring axis (14) a scale angle ? greater than 0° and less than 90° and the measurement scale (18) can be optically detected in the measuring position of the device body (12) by the optical structure (100) for determining the depth of field.