Patent ID: 7102816

Claim:
An arrangement for the manual adjustment of a focus position in a microscope with a motor-operated focusing drive, comprising: a first operator's control for giving an adjusting path length in a focusing movement; and a second operator's control for giving an adjusting speed in the focusing movement, wherein the focusing movement can be initiated, as selected, either with the first operator's control or with the second operator's control, wherein the first and second operator's controls are constructed as rotating knobs, wherein the adjusting direction of the focusing movement is given by the rotating direction of the two rotating knobs, an adjusting path length for the focusing movement is given by a rotational angle of the first rotating knob, and an adjusting speed of the focusing movement is given by the a rotational angle of the second rotating knob, and wherein the change in the rotational angle of the first rotating knob is proportional to the change in the adjusting path and the change in the rotational angle at the second rotating knob is proportional to the change in the adjusting speed and, the second rotating knob has a zero position from which it is rotatable in both opposite rotating directions against a restoring force which increases as the rotating angle increases until reaching a predetermined end position, wherein the adjusting speed has the value of zero in the zero position and the adjusting speed has its maximum in each of the end positions.