Workpiece Holder Layout for Single-Clamp Lens Surface Measurement
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Solution Overview
Problem
Existing measuring devices face challenges in accurately and efficiently measuring optical workpieces with two opposite curved surfaces, such as lenses, as they require precise alignment and re-clamping, which complicates the measurement of geometric parameters and relative positioning of optical axes.
Innovation Solution
A workpiece holder with a carrier and holding body that allows both surfaces to be measured in a single setup using a scanning unit, featuring a cylindrical clamping spigot, axial and peripheral holding surfaces, and transverse channels for access, enabling tactile or non-contact measurement without re-clamping, facilitating easy determination of geometric parameters and relative positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a workpiece with two opposite curved surfaces is measured using conventional measuring devices, then measurement of both surfaces can be performed, but the workpiece requires re-clamping and precise realignment between measurements, increasing measurement time and complexity
Solution Approach 1:
The workpiece is clamped in a specific orientation on the holder before the first measurement, with the holder designed to maintain this orientation during subsequent measurements. This preliminary positioning action eliminates the need for re-clamping and realignment between measurements of opposite surfaces, directly reducing measurement time while preserving accuracy through consistent positioning.
2Measurement precision
If the workpiece is re-clamped to measure the opposite surface, then both surfaces can be measured, but the complexity of the measurement process increases due to multiple setup operations
Solution Approach 1:
The measuring device integrates multiple measurement capabilities into a single setup, allowing both opposite surfaces of the workpiece to be measured without re-clamping. The holder is designed with features that enable the workpiece to be positioned and measured on both sides while maintaining a fixed reference frame, merging what would traditionally require separate measurement operations into one continuous process.
3Measurement precision
If optical workpieces are measured with conventional holders, then measurement is possible, but the structure and arrangement of the workpiece table is impaired due to the need for optical measuring units on both sides
Solution Approach 1:
The holder design enables measurement along the longitudinal axis of the workpiece, allowing optical measuring units to access both opposite surfaces without requiring complex lateral arrangements. By utilizing the longitudinal dimension and designing the holder to expose both surfaces along this axis, the patent simplifies the workpiece table arrangement while maintaining the capability to measure optical axes on both surfaces.
Data Source
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AI summary
The invention relates to a workpiece holder (35), a measuring device (20), and a method for performing a measurement using the workpiece holder (35). The workpiece holder (35) is designed to hold a workpiece (24) with two oppositely arranged workpiece surfaces (24a, 24b) to be measured, such that both workpiece surfaces (24a, 24b) are accessible by a movable probe (26) and can therefore be measured in a single clamping of the workpiece (24). For this purpose, the workpiece holder (35) comprises a support (36) and a holding body (39). The holding body (39) has a holding end (41) facing away from the support (36) with at least one holding surface (42, 43) on which the workpiece (24) is held. In the holding body (39) a free space (47) is formed which, when the workpiece (24) is held, borders the workpiece surface (24b) associated with the carrier and therefore makes the workpiece surface (24b) accessible for measuring or probing.Accessibility for the touch unit (26) is ensured via a transverse channel (49) extending obliquely or perpendicularly to the longitudinal axis (L) of the workpiece carrier (35).