SU198006A1 - OPTICAL SYSTEM WITH INCREASED DEPTH OF SHARPNESS - Google Patents

Description

The known optical systems with an increased depth of field, containing a lens, a rotary overfocusing disk made up of non-coincidently thick parallel-sided plates, and an illuminator with a beam-forming device, do not allow the image scale to be maintained.

The proposed optical system differs from the known ones in that the refocusing disc is installed in a telecentric beam path from the lens, and a rotary hollow drum with a mirror placed in it and with slots on its side surface synchronized with the refocusing disc is inserted into the beam forming device. A shutter synchronized with the refocusing disc is installed in front of the lens, shielding the rays from a permanently Illuminated distant plan. Such an embodiment of the optical system allows reducing the scaling of the image.

The drawing shows a schematic diagram of the described system.

The system consists of a lens / (one OR several) with a telecentric course of rays in the image space; refocusing disk 2 of several plane-parallel plates of different thickness, located in the telecentric course of the rays.

which allows, during rotation, to refocus the system on different planes in the space of objects; and running light systems 3. The number and thickness of the plates, the speed of rotation of the refocusing disk are selected in accordance with the required value of the depth of sharpness of the sharply displayed object space. The system 3 of the traveling illumination provides synchronous with the refocusing from one plane of the sharply depicted object space to another illumination, which eliminates -. There is no overlap of images. The traveling illumination system consists of a source 4 of light, a projection lens 5, a mirror 6, changing the direction of the illuminating beam of rays by 90 ° and a cantilever fixed inside the hollow drum 7 with a slot 8 on its side surface, and a shutter 9 synchronized with the refocusing disk 2 and shielding rays from a constantly illuminated background.

Subject invention

An optical system with an increased depth of focus, containing a lens, a rotary refocusing disk made up of flat-parallel plates that do not coincide in thickness, and an illuminator that, in order to preserve the image scale, the refocusing disk is set in a telecentric beam path from the lens to form beam of beam device introduced rotary hollow drum with a mirror placed in it

and with slots on its lateral surface, synchronized with the refocusing disk, and a shutter synchronized with the refocusing disk, shielding the rays from a constantly illuminated far plan, is installed in front of the lens.