IR-cut filter having red absorbing layer for digital camera

摘要

An infrared cut filter may be used with an image sensor to remove infrared light components from image light received from a first side of the infrared cut filter prior to the image light reaching the image sensor to be disposed on a second side of the infrared cut filter. The infrared cut filter includes at least one red absorbing layer and an infrared reflector. The at least one red absorbing layer partially absorbs red light components within the image light. The infrared reflector reflects the infrared light components. The infrared reflector is disposed between the red absorbing layer and the first side of the infrared cut filter while the at least one red absorbing layer is disposed between the infrared reflector and the second side of the infrared cut filter.

主权项

1. A camera apparatus, comprising:
an image sensor to capture image light and generate an image in response to the image light; an imaging lens optically aligned with the image sensor to focus the image light onto the image sensor; and an infrared cut filter disposed between the imaging lens and the image sensor to remove infrared light components from the image light prior to the image light reaching the image sensor, the infrared cut filter including:
at least one red absorbing layer that partially absorbs red light components within the image light; andan infrared reflector that reflects the infrared light components, the infrared reflector disposed between the red absorbing layer and the imaging lens, wherein the at least one red absorbing layer is a cyan filter that absorbs more red light than green, blue, and infrared light, wherein the at least one red absorbing layer is disposed between the infrared reflector and the image sensor to reduce red ghost images in the image light incident upon the image sensor.