DE1566112C - Optical system of variable magnification for an endoscope - Google Patents

Description

Curvature distances - Abbe- radii
of the lenses the vertex of the lens reck
dex number ■ ί ": ^-;: ■ ■ - ''" m.S. ■ ■ '' - ■ '- ■ ■ ■ "< ■; 1 η

Radii of curvature
of the lenses

distances
the vertex of the lens

If

CQ-S. η

Abbe number

- OO

0 ₀ = 38.4 ... 21.5

0 ₁ = 3.

T ₂ = -14.45

r ₃ = +11.2 -

O ₂ = 10.75. V. 27.65

r ₄ = -13.13

a ₃ = 3.8

α ₄ = 0.8
r ₅ = co

Eyepiece focal length / '= 14.9 ... 27.1, magnification factor 1.82.

1.519 64.0

1.610 59.2 1.678 32.0

20th

25th

30th

r, = -25.93
r ₂ =. .00,; ■■.

r ₃ = co

r ₄ = -14.45

r ₅ = +11.2

r ₆ = -13.13

T _n - OO

= 30.95 ... 20.53

= 1.5 1.519

= 3.2 ... 23.62

64.0

fl ₃ = 3

O ₄ = 16 ... 6 a ₅ = 3.8 a ₆ = 0.8

1.519 f34.0

1.610
1.678

59.2
32.0

(O ₀ is the distance between the object-side surface of the field lens and the image-side vertex of the last link of the intermediate imaging systems of fixed magnification.)

2. Optical system of variable magnification for an endoscope, characterized in that it has a variable magnification eyepiece in which at least two members can be displaced.
Magnification factor 1.68.

(a ₀ is the distance between the first surface on the object side of the displaceable system part and the image-side vertex of the last link of the intermediate imaging systems with fixed magnification.)

3. Optical system of variable magnification for an endoscope, characterized in that it has a variable magnification intermediate imaging system located at the proximal end of the endoscope consists of two slidable sections and for which the following construction data for the optical system must be observed:

Radii of curvature
of the lenses

Distance between the lens vertices Refractive index

Abbe number

a ₀ = 12.66 ... 31.66 .. .56.66 1.618 50.8 T ₁ = +74.42 - - a, = 2 . - ■ " 1.734 .28.1 / 2 = -9.7 < O ₂ = 1> 2 r ₃ = -22.65 Ci ₃ = 54 , 60 ... 54 1.734 "28.1 r ₄ = +22.65 a ₄ = 1.2 1.618 50.8 T ₅ = +9.7 ■ - a ₅ = 2 : ■■■ r ₆ = -74.42 a _b = 58.32 ... 33.32 .. .14.32 "■■ '■" Magnification factor 1.73.

(oq is the distance between the first surface on the object side of the displaceable system part and the image-side vertex of the last link of the intermediate imaging system with fixed magnification.

a _b is the distance between the last surface of the movable system part on the image side and the next intermediate image plane.)

Optical-medical devices or endoscopes are known for examining body cavities an illuminated area of the body cavity via an optic with a distal lens and a proximal eyepiece and any intermediate imaging systems can be observed. To do it

optionally weaker or stronger magnifications without exchanging the instruments or the optics 'optical' has already been proposed to achieve this. Systems of variable magnification in the lenses, To use eyepieces or intermediate imaging systems.

The object of the invention is now to provide an optical system of variable magnification for endoscopes to bring to application, which by a special selection of the design parameters is particularly suitable for endoscopes.

^s This object is achieved according to an embodiment of the invention is that the variable magnification optical system has an eyepiece variable magnification, the field lens _ϊ5 positions is adjustable in two fixed inputs both sides of the eyepiece image plane, said design data specified in claim 1 for the optical system must be adhered to.

According to another solution, the invention consists of a variable magnification optical system for an endoscope that has a variable magnification eyepiece in which at least two members are arranged displaceably, the design data specified in claim 2 for the optical system must be observed.

According to a third solution, according to the present invention, the variable magnification optical system has a Intermediate imaging system of variable magnification, which is made at the proximal end of the endoscope consists of two movable members and in which the design data specified in claim 3 must be observed for the optical system.

In the drawings are possible examples of a variable magnification optical system for a Endoscope shown. In each case, only the part of the system that brings about the change in magnification is involved described in more detail.

1 shows a system in which the ocular field lens is adjustable. The data for a Embodiments are given in claim 1.

This system enables two fixed magnifications that differ by a factor of 1.82.

In FIG. 2 shows a system in which two eyepiece elements are adjustable. The magnification factor is 1.68 for the two end positions. The associated data are in claim 2 specified.

In Fig. 3, a system is shown in which the change in magnification by the displacement of the two members of the intermediate imaging system at the proximal end. The magnification factor is 1.73 in this system. In claim 3 the data for this system are given.

The mean values of the changeable distances apply to a 1:! Mapping.

'■ 1 sheet of drawings

Claims (1)

Claims: are arranged, whereby the following construction data for the optical system must be observed: 1. Optical system of variable magnification for an endoscope, characterized in that that it has an eyepiece of variable magnification, the field lens in two fixed Settings on both sides of the eyepiece image plane can be adjusted, whereby the following construction data for the optical system must be observed: