Patent ID: 11940679
Assignee: SOLUTIA CANADA INC.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. An apparatus comprising:
a. a switchable optical filter comprising:
i. a layer of switchable material, the switchable material comprising a photochromic compound configured to cause the switchable material to transition from a first state to a second state in response to light of a wavelength within a first range of wavelengths, and from the second state to the first state in response to light of a wavelength within a second range of wavelengths, and
ii. a substrate;

b. a first light source providing light of a wavelength that causes the switchable material to transition from a faded state to a dark state, or a dark state to a faded state; and
c. a switch for controlling activation of the first light source.