| CPC G06F 3/03542 (2013.01) [B43K 29/10 (2013.01); G02B 5/23 (2013.01); G06F 3/03545 (2013.01); G06F 3/0386 (2013.01)] | 18 Claims |
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1. A writing implement configured to emit light for altering the appearance of a substrate comprising at least one photochromic material, wherein the writing implement comprises:
an elongate body portion enabling a user to grip the writing implement, wherein the body portion comprises a proximal end and a distal end;
a first light source configured to emit light from the proximal end, wherein the emitted light comprises at least a first colour component within a first wavelength range, wherein the first wavelength range comprises a spectral maximum within one of the ranges: 400 nm-425 nm, 425 nm-475 nm, 475 nm-525 nm, 525 nm-560 nm, 560 nm-590 nm, 590 nm-625 nm, or 625 nm-700 nm;
a controller configured to receive input from a user, and to generate signals for controlling the first light source based on the received user input;
a user-actuatable colour selector configured to receive a colour setting command from a user of the writing implement, and to provide the colour setting command to the controller; and
a first modem, configured to enable the controller to communicate with a second modem,
wherein the controller is configured to interrogate, via the first modem, to an electronic subsystem of a writing medium comprising a substrate, and to receive from the electronic subsystem of the writing medium designation data describing at least a first photochromic material comprised within the substrate of the writing medium, and
wherein the controller is configured to compute the required intensity setting for at least the first colour component emitted by the first light source based on the received writing medium designation data.
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