| CPC F41G 1/30 (2013.01) | 20 Claims |
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1. An optical device comprising:
a housing defining an optical axis;
an optical element received in the housing;
an illumination device being arranged to project light onto the optical element to display a reticle on the optical element, the reticle having a first light intensity;
a light sensor arrangement defining a first effective detector angle of view providing a first sensor signal based on light intensity in a forward-aimed direction and defining a second effective detector angle of view providing a second sensor signal based on ambient light intensity, the light sensor arrangement being arranged to cooperate with the illumination device to enable adjustment of the light intensity of the reticle to a second light intensity as a function of the first and second sensor signals; and
a processor configured to communicate with the light sensor arrangement to adjust the light intensity of the reticle as a function of the first and second sensor signals; wherein the processor is configured to:
determine whether the first sensor signal is static, increasing or decreasing during sequential measurements;
when the second sensor signal is above a first light threshold, operate the light intensity of the reticle according to a first sensitivity; and
when the second sensor signal is below a second light threshold, operate the light intensity of the reticle according to a second sensitivity.
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