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Viewing Inks Printed Behind Lenses with a 3M (TM) Retroreflective Verifier

IP.com Disclosure Number: IPCOM000186513D
Publication Date: 2009-Aug-24
Document File: 1 page(s) / 112K

Publishing Venue

The IP.com Prior Art Database

Abstract

Colorants (eg., inks) are normally viewed in ambient lighting. The colorant's observable color and contrast with the background will vary slightly depending on the ambient lighting conditions. Significantly different color and contrast for the same colorant can be observed in reflection if the colorant is printed on the backside of a lens array sheeting, and the sheeting is illuminated with highly directional light. This effect can be observed using a 3M (TM) Retroreflective Verifier.

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Viewing Inks Printed Behind Lenses with a 3M™ Retroreflective Verifier

Colorants (eg., inks) are normally viewed in ambient lighting. The colorant's observable color and contrast with the background will vary slightly depending on the ambient lighting conditions. The observed color is generally produced from interactions (e.g. scattering, absorption, and reflection) of diffuse ambient lighting with the colorant. However; significantly different color and contrast for the same colorant can be observed in reflection if the colorant is printed on the backside of a lens array sheeting, and the sheeting is illuminated with highly directional light.

This effect can be observed using a 3M™ Retroreflective Verifier. To observe the effect:
1. Print a colorant, such as an ultraviolet cured colorant, on the backside of a lens array sheeting.

2. Position the lens array sheet with lenses facing toward observer and printed area facing away from observer.

3. Position a Retroreflective Verifier between the observer and the lens sheet.
4. Hold verifier close to one eye and turn the switch on
5. Upon illumination the colorant's observed color and/or contrast changes relative to the color and contrast observed in ambient light.

Ambient Light

3M™ Retroreflective Verifier

Retroreflected Light

Figure 1. Viewing inks printed behind lenses with a 3M™ Retrorefl...