Shutter, in particular for an objective, and a CCD-camera

A CCD-camera for an endoscope, having a shutter for use as an objective, for improving the depth of focus in a camera, said shutter comprising:

• in a central area, means for providing a radially uniform transmission function averaged over the circumferential angle, said radial transmission function first dropping off toward zero in a radial transition area which is a continuation of said central area and which has a quantity n of cutouts which extend toward the radial outside and are spaced apart from one another at equal angles 360°/n in the circumferential direction, and the quantity n of cutouts has the value 5, 6 or 7, and
• wherein the shutter is vacuum-deposited on a lens as an opaque layer.

A shutter, for use on an objective, for improving the depth of focus in a camera, said shutter comprising:

• in a central area, means for providing a radially uniform transmission function averaged over the circumferential angle, said radial transmission function first dropping off toward zero in a radial transition area which is a continuation of said central area and which has a quantity n of cutouts which extend toward the radial outside and are spaced apart from one another at equal angles 360°/n in the circumferential direction, and the quantity n of cutouts has the value 5, 6 or 7, and
• wherein the radial transmission function drops off to 90% of the central value at a radius R1 and to 10% of the central value at a radius R2, wherein (R2−R1)<R1.

A shutter, for use on an objective, for improving the depth of focus in a camera, said shutter comprising:

• in a central area, means for providing a radially uniform transmission function averaged over the circumferential angle, said radial transmission function first dropping off toward zero in a radial transition area which is a continuation of said central area and which has a quantity n of cutouts which extend toward the radial outside and are spaced apart from one another at equal angles 360°/n in the circumferential direction, and the quantity n of cutouts has the value 5, 6 or 7, and
• wherein the shutter is vacuum-deposited on a lens as an opaque layer.

A CCD-camera for an endoscope, having a shutter for use as an objective, for improving the depth of focus in a camera, said shutter comprising:

• in a central area, means for providing a radially uniform transmission function averaged over the circumferential angle, said radial transmission function first dropping off toward zero in a radial transition area which is a continuation of said central area and which has a quantity n of cutouts which extend toward the radial outside and are spaced apart from one another at equal angles 360°/n in the circumferential direction, and the quantity n of cutouts has the value 5, 6 or 7, and
• wherein the radial transmission function drops off to 90% of the central value at a radius R1 and to 10% of the central value at a radius R2, wherein (R2−R1)>0.1 R1.

A CCD-camera for an endoscope, having a shutter for use as an objective, for improving the depth of focus in a camera, said shutter comprising:

• in a central area, means for providing a radially uniform transmission function averaged over the circumferential angle, said radial transmission function first dropping off toward zero in a radial transition area which is a continuation of said central area and which has a quantity n of cutouts which extend toward the radial outside and are spaced apart from one another at equal angles 360°/n in the circumferential direction, and the quantity n of cutouts has the value 5, 6 or 7, and
• wherein the radial transmission function drops off to 90% of the central value at a radius R1 and to 10% of the central value at a radius R2, wherein (R2−R1)<R1.