CS237585B1 - Zooming optical system for forming of lateral sliding light spot - Google Patents

Abstract

The present invention relates to zoom optical the system to create a laterally sliding light tracks. The system consists of two optical members and the displacement of one of them in the direction of the optical axis is the projected size tracks. The side feed of this track is performed lateral displacement of one of the optical members. Suitable for devices generating laser beams for ozone patient body in health care centers.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a zoom optical system for generating a laterally displaceable light spot consisting of two lenses mounted on a common axis and separated by an air gap.

Known zoom systems are a unit whose imaging lenses are centrically positioned to produce a sufficiently sharp image of the object. In practice, however, there are cases where a narrow beam of parallel beams, such as laser beams, needs to be converted into a beam of different divergence, which at a certain distance produces a light trace of the desired diameter.

Conventional zoom, which as a whole is displaceable perpendicular to its optical axis, meets this requirement. In addition to this displacement, an additional system such as a diaspor ame tru can be used.

In both cases, such devices are relatively expensive and also exhibit undesirable energy losses on the refractive surfaces of a complex optical system.

Therefore, it was desirable to provide a simple optical zoom system that would allow not only to convert parallel light beams into convergence beams, but also to provide lateral displacement of the light beam.

This object is solved by the object of the invention, which is a zoom optical system for displaying a laterally displaceable light trace, consisting of two lenses mounted on a common axis and separated by an air gap.

SUMMARY OF THE INVENTION The objective of the invention is that a lens on one optical axis or a lens mounted on the other optical axis is displaceable perpendicular to the common optical axis, which is centered in the center of the optical zoom system with both optical axes. direction of this common axis.

Both lenses of the optical system have either a refractive or a refracting refraction. The solved optical system is advantageous for its simplicity, since each of its members has only two refractive surfaces against the air and does not need any additional device.

The mechanical part is also relatively simple, easy to design and manufacture. An exemplary embodiment of an optical system according to the invention is shown schematically in the accompanying drawings, in which FIG. 1 is a diagram of the optical system at a centric position, FIG.

Referring to FIG. 1, the zoom lens assembly is a continuous refractive lens 1 which is displaceably disposed along its axis, _χ in the direction of and away from the arrow R, and a further refractive lens 2.

This further lens 6 is displaceably disposed along its optical axis? in the direction of arrow T. Both axes. O and O are identical to the common O-axis of the entire centered optical system. Narrow volume

2 S light beams P of diameter d coming from an unmarked light source converge at the focal point F of the optical system and proceed as a diverging beam of angle X /.

At the distance b from the lens 2, a light trace of diameter D is formed. If the lens 2 has a focal length and the lens 1 has a focal length, the common focal length f, i.e. the focal length of the entire optical system, is given by:

^f l · ^f 2 ^f l ^{+ f} 2 '

The diameter D of the light track 6 applies

D «» / b-s /, where: D ... the diameter of the light trace diameter,

b ... distance of the light spot from the second lens, sf .. secant distance of the optical system,

d ... the diameter of the beam of light entering the optical system and f ... the focal length of the optical system.

Since the focal length of the optical system f is, in practice, less than the distance b of the light spot 6 from the second lens 2, the above relationship can be simplified to:

That is, the divergence of the beam is given by the magnitude d of the parallel beam of light beams P and the range of focal lengths provided by the optical system. The magnitude D of the light trace pak is then proportional to the distance b of the light trace od from the lens 2.

The change in the direction of the diverging beam forming the light trace je is schematically shown in Fig. 2. It follows that the lens 2 is. its optical axis 0 ^ is deflected by the value h with which the optical axis forms an angle β.

This pousnem will therefore displacement of the light spot on the £ value H. Since the optical axis 0 _Α after passing through the lens into its refracted 2_ focus F ₂ -platí that where the drive:

.4. angle between axes 0 and 0, s 3

h ... the value of the distance of the common axis 0 _g from the optical axis O2 and f2 · · the focal length of the lens 2,

For the transverse distance H of the light trace 6 from the centric position according to Fig. B:

Changing the direction of the common axis 0 _g 0 ^ otpickou axis expressed by an angle w is given by the value of h, the maximum is determined by ^- ~ half the effective lens diameter J. transverse distance of the light spot H value J is directly proportional to the distance b from the lens 2 light trails

6.

An example of a mechanical arrangement is shown schematically in FIG. 3, from which it can be seen that the tube 4 is provided with a longitudinal groove 5. Its lower part passes into a flat flange J in which two magnets 8 are mounted.

The optical member formed by the lens 1 is housed in a sleeve 11 which is slidably mounted in the cavity of the tube in the desired position is secured by a screw 3 which extends through the longitudinal groove 5.

A flat flange 9 is held against the flat flange 9, held by the magnets 8 to the flat flange 9, and in this flat flange 9 a sleeve 20 carrying a second lens 2 is fixed.

«

The magnitude of the light spot 6 is controlled by the axial displacement of the first lens, while the lateral displacement of this light spot 6 is achieved by the lateral displacement of the second lens 2.

Both of these feeds are performed manually. By replacing the sleeve 10 with another, carrying a second lens of different refraction, an optical system of other parameters can be obtained.

The solved optical system is designed for devices, which are used to create a light track of variable diameter and its lateral displacement. They are particularly devices that create laser beams for irradiating a part of the patient's body in medical institutions.

Claims (3)

SUBJECT OF THE INVENTION Transfocating optical system for generating a laterally displaceable light trace, comprising two lenses mounted on a common axis and separated by an air gap, characterized in that the first lens (1) mounted on the object optical axis (0) or the second lens (1) 2), disposed on the image optical axis (Q ^), is displaceable perpendicular to the common optical axis (0 _s ), which in the centered optical zoom system is identical to the optical axes (0, O2) and that at least one of the lenses (1) 2) is displaceable in the direction of this common optical axis (0 _g ). Transfocating optical system according to claim 1, characterized in that the two lenses (1, 2) of the optical system have a continuous refractive power. Transfocating optical system according to claim 1, characterized in that the two lenses (1, 2) of the optical system have a diffusing refraction.