Registers – Coded record sensors – Particular sensor structure
Reexamination Certificate
2006-02-28
2006-02-28
Frech, Karl D. (Department: 2876)
Registers
Coded record sensors
Particular sensor structure
C235S455000, C235S462360, C359S487030, C359S590000, C359S196100, C250S208100
Reexamination Certificate
active
07004391
ABSTRACT:
The present invention provides an optical apparatus comprising an optical gain correction filter having a multilayer film structure formed by stacking a plurality of thin films with different diffractive indexes on a light transmitting board, wherein when the light with the wavelength λ enters at the incident angle θ, the transmissivity is assumed to be T1(λ, θ) (0≦T1(λ, θ)≦1), and the thickness and stacking state of each thin film of the optical gain correction filter are adjusted to increase the transmissivity T1 (λ0, θ) when the incident angle θ increases close to the predetermined maximum incident angle θmax with respect to the incident light with the wavelength λ0. The optical apparatus is applied to a bar code reader.
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Frech Karl D.
Frishauf Holtz Goodman & Chick P.C.
Trail Allyson N
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