Lens module and iris recognition camera module comprising same, and iris recognition camera system and terminal comprising same
One embodiment of an iris recognition camera system comprises: an optical unit for collecting optical information of an iris; and an imaging unit for outputting the optical information of the iris obtained by the optical unit, wherein the optical unit comprises: a first group having a first thickness and refracting light incident from an object; and a second group disposed on the back surface of the first group and comprising at least one lens, wherein the first group comprises a holographic optical element (HOE).
1. An iris recognition camera system comprising:
an optical unit configured to collect optical information of an iris;
an imaging unit configured to output the optical information of the iris obtained from the optical unit,
display units respectively arranged at upper, lower, left, and right sides of the imaging unit so as to surround the imaging unit; and
a control unit configured to control driving of the display units to guide a user to move the iris,
wherein the optical unit comprises:
a first group having a first thickness and refracting light incident from an object, the first group comprising a first lens having positive refractive power and having a convex surface on an object side and a concave surface on an image side, and a second lens having negative refractive power and having a concave surface on the object side and a concave surface on the image side; and
a second group disposed adjacent to a back surface of the first group, the second group comprising third to sixth lenses arranged in an order from the object side to the image side,
wherein the third lens has positive refractive power, the fourth lens has negative refractive power, the fifth lens has positive refractive power, and the sixth lens has negative refractive power,
wherein the fourth lens has a concave surface on the image side, and
wherein the fifth lens has a concave surface on the object side.
2. The iris recognition camera system according to claim 1 , wherein the first group has negative refractive power.
3. The iris recognition camera system according to claim 1 ,
wherein the display units comprise at least one light emitting module.
4. An iris recognition camera system comprising:
an optical unit configured to collect optical information of an iris;
an imaging unit configured to output the optical information of the iris obtained from the optical unit;
a calculation unit configured to analyze a position of a captured iris image generated by the imaging unit on an image sensor;
display units arranged at upper, lower, left, and right sides of the imaging unit so as to surround the imaging unit; and
a control unit configured to control driving of the display units corresponding to a result value outputted from the calculation unit to guide a user to move the iris,
wherein the optical unit comprises:
a first group having positive refractive power; and
a second group having negative refractive power,
wherein the first group comprises no lens, and the second group comprises first to fourth lenses arranged in an order from an object side to an image side,
wherein the first lens has positive refractive power, the second lens has negative refractive power, the third lens has positive refractive power, and the fourth lens has negative refractive power,
wherein the third lens has a concave surface on the object side, and
wherein the second lens has a concave surface on the image side.
5. The iris recognition camera system according to claim 4 , wherein the first group comprises a holographic optical element (HOE).
6. The iris recognition camera system according to claim 5 , wherein the holographic optical element (HOE) has a thickness greater than zero and of 0.3 mm or less.