Patent ID: 9648221
Date: 2017-05-09
CPC Classifications: G02B,H04N

Claim:
1. An electronic device comprising: an image sensor; a phase difference autofocus (AF) sensor module; a reflection-type infrared (IR) cut-off filter disposed on an optical axis to reflect a first portion of light incident thereon through an imaging lens to the phase difference AF sensor module and to allow a second portion of the light to be transmitted therethrough; an absorption-type IR cut-off filter disposed between the image sensor and the reflection-type IR cut-off filter on the optical axis and configured to filter the second portion of the light transmitted through the reflection-type IR cut-off filter and transmit the light, the second portion of which is filtered, to the image sensor; and an auxiliary infrared light source disposed at a position in the electronic device facing the phase difference AF sensor module, and configured to emit auxiliary infrared light when a quantity of light incident on the phase difference AF sensor module is equal to or lower than a reference value, wherein the phase difference AF sensor module performs auto-focusing on a subject using the first portion of the light reflected from the reflection-type IR cut-off filter, wherein the reflection-type IR cut-off filter is disposed to have an inclination angle that allows the first portion of the light to be reflected to the phase difference AF sensor module, and wherein the absorption-type IR cut-off filter filters an infrared wavelength band of light of the second portion of the light that has not been filtered by the reflection-type IR cut-off filter due to the inclination angle of the reflection-type IR cut-off filter.