Patent ID: 6909080

Claim:
An imaging arrangement for imaging a target at one of a plurality of focal planes, comprising: a) a two-dimensional sensor having an array of pixels for converting incident light into electrical signals to be processed into an image of the target; and b) a stationary optical assembly fixed to some, but not all, of the pixels, the assembly having a first plurality of optical portions arranged in a first pattern and fixed to a first group of the pixels, the first portions consisting of a light-refractive material having a first thickness and being operative for focusing the first group of the pixels in the first pattern at a first of the focal planes away from the sensor, the assembly also having a second plurality of optical portions arranged in a second pattern different from the first pattern and fixed to a second group of the pixels, the second portions consisting of a light-refractive material having a second thickness different from the first thickness and being operative for focusing the second group of the pixels in the second pattern at a second of the focal planes spaced apart from the first of the focal planes.