Device and method for optical measurement of an internal contour of a spectacle frame

Patent metadata

Field	Value
Publication number	US-11243139-B2
Application number	US-202117336775-A
Country	US
Kind code	B2
Filing date	Jun 2, 2021
Priority date	Dec 19, 2018
Publication date	Feb 8, 2022
Grant date	Feb 8, 2022

Abstract

An apparatus and a method for optical measurement of an internal contour of a spectacle frame are disclosed. The apparatus contains an optical unit, which is configured to capture light reflected from an illuminated section of the inner contour of the spectacle frame. The optical unit is insertable into the inner contour of the spectacle frame and, when inserted as intended, is rotatable relative to the spectacle frame. The optical unit contains at least one light source, an objective, and at least one optical sensor, wherein the light source is configured to generate a light section, wherein at least one section of the inner contour is illuminable by the light section, wherein the objective is configured to image the illuminated section of the inner contour onto the optical sensor, and wherein the optical sensor is configured to capture the light reflected by the illuminated section of the inner contour.

First claim

The invention claimed is:

1. An apparatus for an optical measurement of an inner contour of a spectacle frame, the apparatus comprising:
an optical unit configured to capture light reflected from an illuminated section of the inner contour of the spectacle frame, wherein the optical unit includes:
at least one light source;
an objective; and
at least one optical sensor,
wherein the light source is configured to generate a light section,
wherein at least one section of the inner contour is illuminable by the light section,
wherein the objective is configured to image the illuminated section of the inner contour onto the optical sensor,
wherein the optical sensor is configured to capture the light reflected by the illuminated section of the inner contour,
wherein the optical unit is insertable into the inner contour of the spectacle frame and, when inserted into the inner contour of the spectacle frame as intended, is mounted so as to be rotatable relative to the spectacle frame,
wherein the light source, the illuminable section of the inner contour, the objective, and the optical sensor are arranged relative to one another such that the section of the inner contour that is illuminable by the light section is placeable into an object-side plane of focus and the optical sensor is arrangeable in an image-side plane of focus, and
wherein the object-side plane of focus, an objective plane, and the image-side plane of focus intersect in a common straight line.

2. The apparatus according to claim 1 , wherein the optical unit is rotatable by an angle such that at least two separate sections of the inner contour are illuminable by the light section, and wherein the optical sensor is configured to capture an image of the respective illuminated section of the inner contour.

3. The apparatus according to claim 2 , wherein the optical sensor is configured to capture a respective image of 30 to 1500 illuminated sections of the inner contour.

4. The apparatus according to claim 2 , wherein the optical unit further comprises a device for determining a value for the angle.

5. The apparatus according to claim 2 , wherein the optical unit further comprises a device for determining a value for the angle by which the optical unit is rotatable.

6. The apparatus according to claim 1 , wherein the optical unit is further configured to capture measurement data, wherein the captured measurement data are based on the capture of the light reflected by the illuminated section of the inner contour of the spectacle frame.

7. The apparatus according to claim 6 , wherein the optical unit further comprises a device for data reduction, wherein the device for data reduction is configured to reduce a scale of the captured measurement data.

8. The apparatus according to claim 7 , wherein the device for data reduction has a gain control, wherein the gain control is configured to compensate for brightness variations in the reflected light which have an effect on the captured measurement data.

9. The apparatus according to claim 6 , wherein the optical unit further comprises a device for optical data transfer, and wherein the device for optical data transfer is configured to transmit the measurement data captured by the optical unit to an evaluation unit.

10. An apparatus for an optical measurement of an inner contour of a spectacle frame, the apparatus comprising:
an optical unit configured to capture light reflected from an illuminated section of the inner contour of the spectacle frame, wherein the optical unit includes:
at least one light source;
an objective; and
at least one optical sensor,

wherein the light source is configured to generate a light section,
wherein at least one section of the inner contour is illuminable by the light section,
wherein the objective is configured to image the illuminated section of the inner contour onto the optical sensor,
wherein the optical sensor is configured to capture the light reflected by the illuminated section of the inner contour,
wherein the optical unit is insertable into the inner contour of the spectacle frame such that the optical unit is movable in such a way that it at least contacts an imaginary plane, which is creatable from at least three points on the inner contour of the spectacle frame, during the optical measurement of the inner contour of the spectacle frame, and upon insertion into the inner contour of the spectacle frame to optically measure the inner contour of the spectacle frame is mounted so as to be rotatable relative to the spectacle frame,
wherein the light source, the illuminable section of the inner contour, the objective, and the optical sensor are arranged relative to one another such that the section of the inner contour that is illuminable by the light section is placeable into an object-side plane of focus and that the optical sensor is arrangeable in an image-side plane of focus, and
wherein the object-side plane of focus, an objective plane, and the image-side plane of focus intersect in a common straight line.

11. An apparatus for an optical measurement of an inner contour of a spectacle frame, the apparatus comprising:
an optical unit configured to capture light reflected from an illuminated section of the inner contour of the spectacle frame,
wherein the optical unit is insertable into the inner contour of the spectacle frame and, when inserted into the inner contour of the spectacle frame as intended, is mounted so as to be rotatable relative to the spectacle frame,
wherein the optical unit includes:
at least one light source;
an objective; and
at least one optical sensor,

wherein the light source is configured to generate a light section,
wherein at least one section of the inner contour is illuminable by the light section, wherein the objective is configured to image the illuminated section of the inner contour onto the optical sensor,
wherein the optical sensor is configured to capture the light reflected by the illuminated section of the inner contour,
wherein the light source, the illuminable section of the inner contour, the objective, and the optical sensor are arranged relative to one another such that the section of the inner contour that is illuminable by the light section is placeable into an object-side plane of focus and that the optical sensor is arrangeable in an image-side plane of focus,
wherein the object-side plane of focus, an objective plane, and the image-side plane of focus intersect in a common straight line,
wherein the optical unit further includes:
at least one optical deflection element, and
wherein the optical deflection element is configured to direct the light section generated by the light source onto the section of the inner contour to be illuminated.

12. The apparatus according to claim 11 , wherein the optical deflection element is selected from a mirror, a prism, a beam splitter, an optical grating, or an optical component which has a plurality of reflecting optical elements.

13. The apparatus according to claim 11 , wherein the optical deflection element has a movable configuration such that at least two separate sections of the inner contour are illuminable by the light section.

14. The apparatus according to claim 11 , wherein the optical unit is further configured to capture measurement data, and wherein the captured measurement data are based on the capture of the light reflected by the illuminated section of the inner contour of the spectacle frame.

15. The apparatus according to claim 10 , wherein the optical unit further comprises a device for data reduction, and wherein the device fo

Assignees

• Zeiss Carl Vision Int Gmbh

Inventors

• Meschenmoser Ralf
• Pauker Friedrich

Classifications

• G02C13/005

  Measuring geometric parameters required to locate ophtalmic lenses in spectacles frames (apparatus for testing or instruments for examining the eyes per se A61B3/00; machines or devices and accessories for grinding the edges of lenses using spectacles as a template B24B9/144) · CPC title

• G06T7/0004

  Industrial image inspection · CPC title

• G01M11/0214

  Details of devices holding the object to be tested · CPC title

• G06T7/60

  Analysis of geometric attributes · CPC title

• G02C1/10

  Special mounting grooves in the rim or on the lens · CPC title