Inspection method for lens products, and apparatus for the same
AssigneeDai Nippon Printing Co., Ltd.
InventorsMasatoshi Kitamura, Hisamitsu Kawaguchi
Life of this patent
Estimating the term…
Abstract
An inspection method that enables efficient inspection operations before the shipment of a sheet lens product. A sheet-like Fresnel lens sheet having a masking material bonded on its light-incidence surface is placed on an operation surface equipped with a black color system of background with the light-incidence surface up. On the operation surface the masking material is exfoliated. At the same time the Fresnel lens sheet is inspected by the reflected light to thereby make an inspection of the presence or absence of a white color system of defects. Thereafter, the Fresnel lens sheet is inspected by a the transmission light.
Claims13
An inspection method for a sheet-like lens product having a masking material overlaid on a surface of said lens product, comprising the steps of:
- placing the lens product, on an operation surface having a black color background, with the surface of the lens product having the masking material facing up;
- stripping off the masking material and inspecting the lens product through the use of a reflected light, while the lens product is being placed on the operation surface;
- and
- thereafter inspecting the lens product through the use of a transmission light.
An inspection apparatus comprising:
- a box-shaped inspection base;
- a transparent panel provided on a surface of the inspection base;
- and,
- a black color background portion observable through the transparent panel.
An inspection apparatus comprising:
- an operation surface equipped with a black color background;
- and
- a receiving portion provided at a lower portion of the operation surface for receiving thereon a sheet lens product, wherein a surface of the receiving portion is provided with a grounded conductive portion.
Dependencies are inferred from the claim text.