Optical lens system comprising two more than half-spherical lenses

A method of manufacturing an optical lens system comprising:

• providing a first lens comprising a more than half part of a substantially spherical first lens body having a first diameter and a substantially flat first boundary surface;
• providing a second lens comprising a more than half part of a substantially spherical second lens body having a second diameter and a substantially flat second boundary surface, the second diameter being smaller than the first diameter;
• providing a lens holder comprising a first and second mount for, respectively, the first and the second lens, wherein the first and the second mounts comprise, respectively, a first and a second circular cylindrical inner wall having a common center line, a diameter of the first inner wall and a diameter of the second inner wall being substantially equal to, respectively, the first and the second diameters;
• wherein the first boundary surface faces the second lens, and the first boundary surface extends perpendicularly to the center line and wherein the first mount is provided with an abutting member for the first boundary surface, the abutting member extending in a plane perpendicular to the center line;
• wherein the second boundary surface faces away from the first lens and wherein the second boundary surface extends perpendicular to the center line;
• and
• positioning the second lens in the second mount by supporting the boundary surface of the second lens by means of a first aligning surface of an aligning tool, and by simultaneously supporting the abutting member of the first mount by means of a second aligning surface of the aligning tool that is directed parallel to the first aligning surface.

A method of manufacturing an optical lens system comprising:

• providing a first lens comprising a more than half part of a substantially spherical first lens body having a first diameter and a substantially flat first boundary surface;
• providing a second lens comprising a more than half part of a substantially spherical second lens body having a second diameter and a substantially flat second boundary surface, the second diameter being smaller than the first diameter;
• providing a lens holder comprising a first and a second mount for, respectively, the first and the second lens, wherein the first and the second mounts comprise, respectively, a first and a second circular cylindrical inner wall having a common center line, a diameter of the first inner wall and a diameter of the second inner wall being substantially equal to, respectively, the first and the second diameters;
• wherein the first boundary surface faces the second lens, and the first boundary surface extends perpendicularly to the center line and wherein the first mount is provided with an abutting member for the first boundary surface, the abutting member extending in a plane perpendicular to the center line;
• wherein the second mount is provided, on a side facing away from the first lens, with an end surface extending perpendicularly to the center line, the end surface and the second boundary surface being situated in a common plane;
• and
• positioning the second lens in the second mount by simultaneously supporting the boundary surface of the second lens and the end surface of the second mount by means of an aligning surface of an aligning tool.

An optical scanning device for scanning an information layer of an optically scannable information carrier comprising;

• a radiation source;
• and
• an optical lens system having an optical axis for focussing a radiation beam supplied, in operation, by the radiation source to a scanning spot on the information layer, the lens system comprising:
• a first lens comprising a more than half part of a substantially spherical first lens body having a first diameter and a substantially flat first boundary surface;
• a second lens comprising a more than half part of a substantially spherical second lens body having a second diameter and a substantially flat second boundary surface, the second diameter being smaller than the first diameter;
• and
• a lens holder comprising a first and a second mount for, respectively, the first and the second lens in fixed positions, wherein the first and second mounts comprise, respectively, a first and a second circular cylindrical inner wall having a common center line, a diameter of the first inner wall and a diameter of the second inner wall being substantially equal to, respectively, the first and the second diameters.

An optical player comprising:

• a table which can be rotated about an axis of rotation;
• an optical scanning device for scanning an information layer of an optically scannable information carrier which can be placed on the table;
• and
• means for displacing an optical lens system of the scanning device in a direction perpendicular to the axis of rotation, the lens system comprising:
• a first lens comprising a more than half part of a substantially spherical first lens body having a first diameter and a substantially flat first boundary surface;
• a second lens comprising a more than half part of a substantially spherical second lens body having a second diameter and a substantially flat second boundary surface, the second diameter being smaller than the first diameter;
• and
• a lens holder comprising a first and a second mount for, respectively, the first and the second lens in fixed positions, wherein the first and the second mounts comprise, respectively, a first and a second circular cylindrical inner wall having a common center line, a diameter of the first inner wall and a diameter of the second inner wall being substantially equal to, respectively, the first and second diameters.