SU569998A1 - Projection panmultipe objective with varying magnification - Google Patents

Description

I

The invention relates to optics and can be applied in a chain of projection devices where smooth zooming is necessary when the object and image planes are stationary, a large linear field of view, and high demands on image quality, including the secondary spectrum. relative aperture of 1: 1.2, for example, in overhead projectors for KBeTit TV.

A number of pankragicheskih systems are known, which have the actual object and image planes, for example, a three-component pancratic system with a fixed object and image plane throughout the entire range of magnification, this is achieved by moving two components according to the nonlinear law Q.

These systems are referred to as pancratic turning systems, have low characteristics compared, in particular small relative apertures, corresponding to numerical apertures not higher than 0.1: 0.1.

and are used in telescopes and stereoscopic instruments.

Three-component and four-component pancrash systems are known, having rather high characteristics (relative openings up to 1: 1.2) and relating to projection systems 2. But in these systems, the change in magnification is dried out by moving only one of the components, due to where the field 6 (the enne planes of the subject and the image vary over the larger limits. Such systems can be used in imabors, not requiring the position of the planes of the subject and the image, for example, in film and photo projectors.

Closest to the invention of the technical nature is a pranktic system consisting of three components; the first negative, the second put gel and the third positive s. This pankratic system has a large relative aperture of 1: 1.2. Change

magnification is accomplished by moving the first two components of the system; negative and positive along the optical axis according to a nonlinear law, which makes it possible to obtain a constant position of the object and image planes throughout the entire range of variation; the magnification of the Ego pancreatic system is used in projectors for an 8 mm film of dadrov 3.3 X 4.5 { 5.6 mm diagonal).

However, the design of the components of this pancreatic system does not allow its propagation at large linear fields of the R & D Institute, as the secondary cnieKTp is not fixed in the system, which reduces the quality of its KetQf image. These factors are essentially limited, they are the field of application of this pancreatic system, HanfsJMep cannot be named in the projectors for color television, where a peak field of vision is required in the area of objects, determined by the diagonal screen size of the radiation beam tube equal to 150 mm, | and a linear field of vision in space and field views. -. It defines the diagonal size of the transparency, varying from 40 to 16 mm, and also requires a significant reduction in the secondary spectrum at a relative aperture of 1: 1.2.

The chain of the invention is to increase the diney FIELD of view na HKiE raqecKoft system and improve the quality of its images by reducing the secondary spectrum with a relative aperture of 1: 1.2.

This is in a panstraktic system, consisting of the first negative, second and third positive components, with the first and second components being set up with the ability to move along the optical axis according to a nonlinear law, the first component is made in the form of a negative double-sided lens and one-handed meniscus reversed ; the side of the plane of the object, the thickness of which is 0.2-0.3 of the focal length of the first component, and the optical power O ,, 35 of the optical power of the first component, the second component is made of positive two-glued meniscus reversed by concavity towards the plane of the object, optc - the combing power of which is 0.2-0.3 optical power of the second component, and the PNZ, and the third component is made of a double-glued positive lens and a mirror-lens group composed of two mirrors and at least two lenses.

The drawing shows the proposed pancragic system with real immovable planes of the object and the image.

The system contains the first negative 1,, second 2 and third 3 positive components. The first component consists of lenses 4 and 5, forming a negative two-glued lens 6, and a negative Meniscus 7, facing indentation toward the plane of the object, whose thickness is 0.2-0.3 of the focal length of component 1, and (optical power 0, 30-0.35 of the optical power of component 1, the second component 2 consists of lenses 8, 9, forming a glued meniscus 10 facing in with a concavity to the side, the plane of the object, the optical power of which is 0.20, 3 of the optical power of component 2 and lenses 11, 12 forming a positive double-glue lens 13, and the third component 3 consists of two rpyim lenses 14 and 15 with a parallel course of rays between them: the first one is made in the form of a positive two-glued lens 14 glued together from lenses 16,: 17; the second is (contains a single positive lens 18, a negative lens 19, mirrors 20 and 21, and a two-lens lens 22 glued together from lenses 23 and 24.

The known magnifications of the system with a fixed position of the planes of the object and the image are carried out by moving the first 1 and second 2 components along the optical axis in a non-linear manner.

The constructive component of the projection and crusting system provides, in comparison with the known systems, a linear field of view in the space of 150 mm objects and a linear field of view in the image space, varying from 4 to 16 mm and significantly reducing the secondary spectrum of the system at relative aperture 1; 1.2.

Claims (3)

1. US patent number; ZOZO861, cl. 350-184, 1959, 2. US patent number 3694056, cl. 350-184, 1972. 3. The US patent number 3372974, class. 350-186, 1968. / X t /  X X  / i u / 23 21 th 19 t W