DE1566112B2 - OPTICAL SYSTEM OF VARIABLE ENLARGEMENT FOR AN ENDOSCOPE - Google Patents

Description

Curvature the distances - Abbe- radii Lens vertex ' 0 5 ' number of the lenses a ₀ = £ - °
CQ. £ 3
η V 38.4 ... 21.5 η = 00 Cl ₁ - 3 1.519 64.0 r ₂ = -14.45 U ₂ = 10.75 ... 27.65 r ₃ = +11.2 a ₃ = 3.8 1.610 59.2 = -13.13 a ₄ = 0.8 1.678 32.0

20th

r ₅ = 00

-Ocular focal length / '= 14.9 ... 27.1,
Magnification factor 1.82.

(a 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 with 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 are arranged to be displaceable The following design data for the optical system must be observed:

Curvature

radii
of the lenses

distances
the vertex of the lens

1 s-

1.1

Abbe number

= ^ 25.93

= 00

= 00

r ₄ = -14.45
r ₅ = +11.2
r ₆ = -13.13

r ₇ =

O ₀ = 30.95 ... 20.53

a, = 1.5

O ₂ = 3.2 ... 23.62

a ₃ = 3

a ₄ = 16 ... 6

a ₅ = 3.8 1.610

a ₆ = 0.8 1.678

1.519 64.0

1.519 64.0

59.2 32.0

Eyepiece focal length / '= 9.86 ... 16.53, 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 movable sections and for which the following construction data for the optical system must be observed:

Radii of curvature
of the lenses

Distances of the lens vertices Refractive index

Abbe number

O ₀ = 12.66 ... 31.66 .. .56.66 1.618 50.8 Π = +74.42 ^a i = 2 1.734 28.1 r ₂ = -9.7 a ₂ = 1.2 V ₃ = -22.65 a = 54 60 54 1.734 28.1 r ₄ = +22.65 3 α ₄ = 1.2 1.618 50.8 r ₅ = +9.7 a ₅ = 2 r ₆ = -74.42 ^a b = 58.32 ... 33.32 .. .14.32 Magnification factor 1.73.

(a _? 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.

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

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 to achieve, it has already been proposed to use optical systems of variable magnification in the objectives, 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.

According to one embodiment of the invention, this object is achieved in that the optical system variable magnification has a variable magnification eyepiece with its field lens in two fixed positions is adjustable on both sides of the eyepiece image plane, with the following construction data for the optical system must be observed:

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, while observing the following design data for the optical system are:

Radii of curvature
of the lenses

distances
the vertex of the lens

Refractive index

Abbe number

Radii of curvature
of the lenses

distances
the vertex of the lens

Refractive index

20th

Abbe number

T ₁ = 00

r ₂ = -14.45

r ₃ = +11.2

r ₄ = -13.13

r ₅ = 00

O ₀ = 38.4 ... 21.5

U ₁ = 3 1.519 64.0

α ₂ = 10.75 ... 27.65 ₃ ο

1.610 59.2 1.678 32.0

T ₁ = -25.93

r ₂ = οο

r ₃ = οο

r ₄ = -14.45

r ₅ _ = +11.2

r ₆ = -13.13

Τη = OO

O ₀ = 30.95 ... 20.53

«Ι = 1.5

a _z = 3.2 ... 23.62

α ₃ = 3

α ₄ = 16 ... 6

α ₅ = 3.8

α ₆ = 0.8

1.519 64.0

1.519 64.0

1.610 59.2

1.678 32.0

a ₃ = 3.8

a ₄ = 0.8

35 eyepiece focal length / '= 9.86 ... 16.53, 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.)

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

According to a third solution, the optical system of variable magnification has according to the invention an intermediate imaging system of variable magnification, (a ₀ is the distance from the object-side surface 40 which, at the proximal end of the endoscope, consists of the field lens to the image-side vertex of the last two movable members and, for the member, the intermediate imaging system The following construction data for the optical magnification.) System must be adhered to:

Radii of curvature ßo distances .56.66 Refractive Abbe- of the lenses the vertex of the lens index number ^α ι Il I ¹ = 12.66 ... 31.66 .. ■ ■ T ₁ = +74.42 «2 = 2 1.618 50.8 r ₂ = -9.7 "3 = 1.2 1.734 28.1 r ₃ = -22.65 α ₄ = 54 ... 60 ... 54 r ₄ = +22.65 α ₅ = 1.2 1.734 28.1 r ₅ = +9.7 a _h .14.32 = 2 1.618 50.8 ; r ₆ = -74.42 = 58.32 ... 33.32 ..

Magnification factor: 1.73.

(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.

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

5 6

In the drawings and the following days in FIG. 2 shows a system in which

Bells are possible examples of an optical sy- two ocular elements are adjustable. The variable magnification for an endoscope is the magnification factor at the two end positions. In each case, there is only 1.68 in the tables. The associated data are given in Table 2 of the system that causes the change in magnification:
part described in more detail.

In FIG. 1 shows a system in which Table 2

the eyepiece field lens is adjustable. The data for an _n »

Embodiments are given in Table 1: a ₀ = 30.95 ... 20.53

10 T ₁ = -25.93

Table 1 O ₁ = 1.5 1.519 64.0

r ₂ = 00

0 ₀ = 38.4 ... 21.5 " ^v a ₂ = 3.2 ... 23.62
T ₁ = 00 "r ₃ = co

0 ₁ = 3 1.519 64.0 15 a ₃ = 3 1.519 64.0
r ₂ = -14.45 r ₄ = -14.45

a ₂ = 10.75 ... 27.65 a ₄ = 16 ... 6

r ₃ = +11.2 ... r ₅ = +11.2

a ₃ = 3.8 1.610 59.2 a ₅ = 3.8 1.610 59.2

r ₄ = -13.13 20 r ₆ = -13.13

'a ₄ = 0.8 1.678 32.0 a ₆ = 0.8 1.678 32.0

r _s - 00 r ₇ = co

/ '= 14.9 ... 27.1, /' = 9.86 ... 16.53,

Magnification factor 1.82. 25 Magnification factor 1.68.

a ₀ is the distance between the object-side surface of _{χ dp} . _{ . _g , in which

Feldhnse to the vertex of the last link, _{the change in} magnification due to the displacement

of the intermediate imaging systems. _{the one at} ^ _en q ^ deg intermediate _{imaging system}

This system allows two fixed predetermined 30s to be effected at the proximal end. The enlargement

Magnifications that are increased by a factor of 1.82 are 1.73 in this system. In the

divorce. Table 3 gives the data for this system:

Table 3

a ₀ = 12.66 ... 31.66. ..56.66 1.618 50.8 T ₁ = +74.42 O ₁ = 2 1,734 28.1 r ₂ = -9.7 a ₂ = 1.2 r ₃ = -22.65 a ₃ = 54 .60 ... 54 1.734 28.1 r ₄ = +.22.65 a ₄ = 1.2 1.618 50.8 r ₅ = +9.7 a ₅ = 2 r ₆ = -74.42 a _b = 58.32 ... 33.32. ..14.32

Magnification factor 1.73.

With a _b the distance between the image-side vertex of the second member of the intermediate imaging system and the intermediate image plane is meant.
The mean values of the changeable distances apply to a 1:! Mapping.

1 sheet of drawings

Claims (1)

Patent claims: 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: