Method for displaying result of measurement of eccentricity

• US 7,944,552 B2
• Filed: 08/04/2008
• Issued: 05/17/2011
• Est. Priority Date: 05/28/2004
• Status: Expired due to Fees

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Murata, Yasunori
• Primary Examiner(s): Toatley; Gregory J
• Assistant Examiner(s): Valentin; Juan D
• Application Number:
  US12/185,599
• Publication Number:
  US 20080310275A1
• Time in Patent Office: 1,016 Days
• Field of Search: None
• US Class Current: 356/124
• CPC Class Codes: G01B 11/27 for testing the alignment of axes means for centering or aligning a light guide within a ferrule G02B6/3834
• CPC Class Codes: G01M 11/0221 by determining the optical axis or position of lenses

Abstract

A method for displaying a result of measurement of eccentricity in an optical system is provided where an amount of eccentricity for each lens element'"'"'s surface in a lens system can be displayed and where the amount of eccentricity displayed can be a magnified amount of eccentricity. Additionally a sectional view of the lens system can be displayed using scaling factor.

Claims

1. A method for displaying a result of measurement of eccentricity, the method comprising the steps of:

sequentially projecting an indicator to a position of each design apparent center of curvature of a plurality of surfaces to be measured, the surfaces being included in a lens system to be measured; and

displaying an amount of eccentricity of each surface to be measured, the amount of eccentricity being determined from a state of a reflected image of the indicator, the reflected image being reflected from each surface to be measured,

wherein the amount of eccentricity is magnified using a magnification factor and the magnified amount of eccentricity is represented in a sectional view of the lens system, using a scaling factor of the lens system to display the lens system, wherein the scaling factor and the magnification factor are independently valued.

2. The method according to claim 1, wherein the amount of eccentricity is magnified so that a tangent component of a tilt amount of eccentricity in the amount of eccentricity is multiplied by the magnification factor for magnifying the amount of eccentricity and that a shift amount of eccentricity in the amount of eccentricity is directly multiplied by the magnification factor for magnifying the amount of eccentricity, so that the magnified amount of eccentricity is represented.

3. The method according to claim 1, wherein the amount of eccentricity is displayed so that a first scale indicating the length along an optical axis and a second scale indicating the amount of eccentricity in a direction perpendicular to the optical axis are represented.

4. The method according to claim 1, the amount of eccentricity is displayed so that an eccentricity state of the lens is shown by two cross sections, one being defined by the x-axis and y-axis and the other being defined by the x-axis and z-axis, where the x-axis is an optical axis of the lens system, the y-axis is an axis perpendicular to the optical axis, and the z-axis is an axis perpendicular to the x-axis and y-axis.

5. The method according to claim 1, wherein the amount of eccentricity is displayed so that that a section view of the lens system with the magnified amount of eccentricity is represented by an enhanced line and a section view of the lens system in a reference state is represented by a line that is not enhanced, the reference state including no eccentricity with respect to a measuring reference axis.

6. The method according to claim 1, wherein the amount of eccentricity is displayed in so that at least one of an evaluation axis of the lens system, a mean axis, and an optical axis of each lens element is represented, the mean axis being determined with respect to the evaluation axis of individual lens groups into which the lens system is divided.

7. The method according to claim 1, wherein the amount of eccentricity is displayed in so that one of the results of measurement of eccentricity of the lens system in different focusing states of the lens system and different zooming states of the lens system is represented.

8. The method according to claim 1, wherein the amount of eccentricity is displayed so that the magnified amount of eccentricity is represented in a display device.

9. The method according to claim 1, wherein the amount of eccentricity is displayed so that the magnified amount of eccentricity is represented on a medium from a printing device.