Imaging optical system for 3d image acquisition apparatus, and 3d image acquisition apparatus including the imaging optical system

A three-dimensional (3D) image acquisition apparatus comprising:

• an imaging optical system comprising:
• an object lens configured to transmit light;
• first and second image sensors, wherein a size of the second image sensor is different from a size of the first image sensor;
• a beamsplitter on which the light transmitted by the object lens is incident, wherein the beamsplitter is configured to split the light incident thereon into light of a first wavelength band and light of a second wavelength band, direct the light of the first wavelength band to the first image sensor, and direct the light of the second wavelength band to the second image sensor;
• and
• at least one optical element disposed between the beamsplitter and the second image sensor, wherein the at least one optical element is configured to reduce an image which is incident on the second image sensor,
• wherein the at least one optical element comprises at least one of a Fresnel lens and a diffractive optical element (DOE);
• a light source configured to generate light of the second wavelength band light and irradiate the light of the second wavelength band onto a target object;
• an image signal processor (ISP) configured to generate a 3D image by using an image output from the first image sensor and an image output from the second image sensor;
• and
• a control unit configured to control operations of the light source and the ISP.