Contactless type optical device
A contactless type optical device includes an image photographing module configured to photograph a subject, the image photographing module including a photographing lens forming an image of light that is scattered from the subject and is incident on the photographing lens; an illuminator configured to radiate illumination light, the illuminator being disposed within a predetermined distance from the image photographing module; a first lens configured to reduce an incidence angle of the illumination light traveling from the illuminator; and a second lens having a first surface to which the illumination light passing through the first lens is incident to be transmitted, and a second surface to which the subject's scattered light scattered from the subject is incident to be transmitted. The photographing lens is disposed such that the subject's scattered light passing through the second lens is incident on the photographing lens.
1. A contactless type optical device, comprising:
an image photographing module configured to photograph a subject, the image photographing module including a photographing lens forming an image of light that is scattered from the subject and is incident on the photographing lens;
an illuminator configured to radiate illumination light, the illuminator disposed on a plane within a predetermined distance from the image photographing module;
a first lens configured to reduce an incidence angle of the illumination light traveling from the illuminator;
a second lens having a first surface to which the illumination light passing through the first lens is incident to be transmitted, and a second surface to which the subject's scattered light scattered from the subject is incident to be transmitted; and
a reflector to reflect the subject's scattered light so that the subject's scattered light is incident on the image photographing module,
wherein the photographing lens is disposed such that the subject's scattered light passing through the second lens is incident on the photographing lens,
wherein the first lens is disposed to be spaced apart from the illuminator to face the illuminator,
wherein the reflector includes a first reflector and a second reflector disposed between the first lens and the second lens,
wherein the first reflector and the second reflector are disposed to be spaced apart from each other by a predetermined distance to face each other while no other reflectors are placed between the first reflector and the second reflector, and
wherein a distance between the first reflector and the second reflector is larger than a diameter of the first lens.
2. The contactless type optical device of claim 1 , wherein the distance between the first reflector and the second reflector is smaller than a diameter of the second lens.
3. The contactless type optical device of claim 1 , wherein the first reflector and the second reflector are disposed at respective preset angles between the image photographing module and the second lens to reflect the subject's scattered light.
4. The contactless type optical device of claim 1 , wherein the illuminator, the reflector, and the second lens are configured such that the illumination light is incident towards the second lens without being reflected by the reflector.
5. The contactless type optical device of claim 1 , wherein the second lens is configured such that the subject's scattered light scattered from the subject is incident on the image photographing module at a view angle ranging from −5° to 5°.
6. The contactless type optical device of claim 1 , wherein the first lens includes a convex lens.
7. The contactless type optical device of claim 1 , wherein the second lens includes an objective lens that is a convex lens.
8. The contactless type optical device of claim 1 , wherein an optical axis of the illuminator is disposed between the first reflector and the second reflector.