| 摘要 |
PURPOSE: A far-infrared camera lens unit with high definition is provided to have high definition and low angle of view as being manufactured easily by being formed with molding. CONSTITUTION: A far-infrared camera lens unit has a first lens(L11), a second lens(L21) and a third lens(L31) in sequence from an object side(OBJ) toward the direction of an image side(IMG). The first lens has a positive refractive index of meniscus type having a first convex plane(b1) whose plane facing with the object side is convex. Both sides of the first lens are formed to be spherical surfaces. The second lens has a negative refractive index and both sides of the second lens are spherical surfaces. The third lens has a positive refractive index of meniscus type having a second convex plane(b2) whose second lens is convex. |
