Optical unit

An optical unit comprising, seen in a direction from the object side to the imaging surface a first substrate, a first lens element, a flat, transparent intermediate layer, a second lens element and a second substrate, which intermediate layer has a optically correcting function near the imaging surface, characterised in that the intermediate layer is connected to the first lens element and the second lens element by means of an adhesive.

An optical unit comprising, seen in a direction from the object side to the imaging surface, a first substrate, a first lens element, a flat, transparent intermediate layer, a second lens element and a second substrate, which intermediate layer has an optically correcting function near the imaging surface, characterised in that a fourth lens element is disposed against the second substrate, seen in the direction of the imaging surface, and further characterised in that the fourth lens element is a plano convex lens, and that the fourth lens element is a plano convex/concave lens.

An optical unit comprising, seen in a direction from the object side to the imaging surface, a first substrate, a first lens element, a flat, transparent intermediate layer, a second lens element and a second substrate, which intermediate layer has an optically correcting function near the imaging surface, characterised in that between the first lens element and the first substrate a flat replica layer forming a buffer layer is present.

An optical unit comprising, seen in a direction from the object side to the imaging surface, a first substrate, a first lens element, a flat, transparent intermediate layer, a second lens element and a second substrate, which intermediate layer has an optically correcting function near the imaging surface, characterised in that between the second lens element and the second substrate a flat replica layer forming a buffer layer is present.

An optical unit comprising, seen in a direction from the object side to the imaging surface, a first substrate, a first lens element, a flat, transparent intermediate layer, a second lens element and a second substrate, which intermediate layer has an optically correcting function near the imaging surface, characterised in that a fourth lens element is disposed against the second substrate, seen in the direction of the imaging surface, and further characterised in that the third and the fourth lens element have an Abbe number in the 50-80 range and a refractive index in the 1.45-1.55 range.

An optical unit comprising, seen in a direction from the object side to the imaging surface, a first substrate, a first lens element, a flat, transparent intermediate layer, a second lens element and a second substrate, which intermediate layer has an optically correcting function near the imaging surface, characterised in that the first and the second lens element have an Abbe number in the 20-50 range and a refractive index in the 1.55-2.00 range.

An optical unit comprising, seen in a direction from the object side to the imaging surface, a first substrate, a first lens element, a flat, transparent intermediate layer, a second lens element and a second substrate, which intermediate layer has an optically correcting function near the imaging surface, characterised in that a fourth lens element is disposed against the second substrate, seen in the direction of the imaging surface, and further characterised in that the first, the second, the third and the fourth lens element have an Abbe number in the 20-50 range and a refractive index in the 1.55-2.00 range.

An optical unit comprising, seen in a direction from the object side to the imaging surface, a first substrate, a first lens element, a flat, transparent intermediate layer, a second lens element and a second substrate, which intermediate layer has an optically correcting function near the imaging surface, characterised in that the second substrate at the same time functions as a sensor screening plate.