Lens shape measurement device

Patent metadata

Field	Value
Publication number	US-9714824-B2
Application number	US-201113638779-A
Country	US
Kind code	B2
Filing date	Mar 31, 2011
Priority date	Mar 31, 2010
Publication date	Jul 25, 2017
Grant date	Jul 25, 2017

Abstract

A lens shape measurement device, includes: a rotation unit that rotates a lens supported by a stage; a laser displacement meter; a first moving unit that moves the laser displacement meter in a X-direction; a second moving unit that moves the lens in a Y-direction; and a drive controller that controls a drive of the rotation unit, the first moving unit, and the second moving unit in a mirror reflection state in which an incidence angle of the laser beams incident on a measurement target from the laser displacement meter, and a reflection angle of the laser beams reflected by the measurement target are equal to each other with a normal line of the lens passing through the measurement target set as a reference, for each of a plurality of measurement targets set on an edge of the lens in a rotating direction of the lens.

First claim

The invention claimed is:

1. A lens shape measurement device, comprising:
a supporting unit that supports a spectacle lens edged based on edging data;
a laser displacement meter that measures a measurement position of a measurement object utilizing a variation of an observation point of a reflected light which varies depending on the measurement position of the measurement object, when the measurement position of an object surface is irradiated with laser beams, the laser displacement meter being translatable along X and Z axes;
a relative position altering unit that alters a relative position between the spectacle lens supported by the supporting unit and the laser displacement meter; and
a drive controller, wherein the drive controller controls the relative position altering unit based on the edging data at a time of measuring an edging shape of the spectacle lens, the measurement device obtaining, by virtue of the controller controlling the drive of the relative position altering unit based on the edging data, a mirror reflection having a predetermined angle to a normal line passing through a measurement object, for each measurement object of a plurality of measurement objects set on an edge surface of the spectacle lens and the angle is (1) the same incident angle for each of the plurality of measurement objects, (2) the same reflection angle for each of the plurality of measurement objects, or (3) the same incident angle and the same reflection angle for each of the plurality of measurement objects.

2. The lens shape measurement device according to claim 1 , wherein
the relative position altering unit includes:
XY-axes moving systems that alter a relative position between the spectacle lens and the laser displacement meter in a direction parallel to a plane including the measurement reference axis of the laser displacement meter;
a Z-axis moving system that alters the relative position between the spectacle lens and the laser displacement meter in a direction vertical to the plane; and
a θ-axis rotation system that rotates the spectacle lens around a rotation axis vertical to the plane, and

the drive controller controls drive of the XY-axes moving systems, the Z-axis moving system, and the θ-axis rotation system so that a normal line passing through the measurement object coincides with the measurement reference axis, and the measurement object is positioned at the focal position.

3. The lens shape measurement device according to claim 2 ,
wherein the XY-axes moving systems including:
an X-axis moving system and a Y-axis moving system composed of two different moving axes, in a mutually structurally separated state,
wherein the laser displacement meter is attached to one of these X-axis moving system and Y-axis moving system, and the θ-axis rotation system supporting the spectacle lens is attached to the other moving system.

4. The lens shape measurement device according to claim 3 , wherein the laser displacement meter is attached to one of the moving systems through the Z-axis moving system.

5. The lens shape measurement device according to claim 1 , wherein the lens is rotated by driving of the relative position altering unit from a state at which each part of the lens shape measurement device is set at a home position, and the lens is moved so as to gradually approach the laser displacement meter by the drive of a motor of the relative position altering unit that moves the lens along a depth axis.

6. A lens shape measurement device, comprising:
a supporting unit that supports a spectacle lens edged based on edging data;
a laser displacement meter that measures a measurement position of an object utilizing a variation of an observation point of a reflected light which varies depending on the measurement position of the object, when the measurement position of an object surface is irradiated with laser beams, the laser displacement meter being translatable along X and Z axes;
a relative position altering unit that alters a relative position between the spectacle lens supported by the supporting unit and the laser displacement meter; and
a drive controller, wherein the drive controller controls the relative position altering unit at a time of measuring an edging shape of the spectacle lens, the measurement device obtaining, by virtue of the controller controlling the drive of the relative position altering unit, a mirror reflection having a predetermined angle to a normal line passing through each measurement object of a plurality of measurement objects set on an edge surface of the spectacle lens and the angle is (1) the same incident angle for each of the plurality of measurement objects, (2) the same reflection angle for each of the plurality of measurement objects, or (3) the same incident angle and the same reflection angle for each of the plurality of measurement objects, by controlling the drive of the relative position altering unit so that an output from the light receiving part at a time of irradiating at least one laser beam from the light projecting part to a first place deviated to one side in a circumferential direction of the lens from the measurement object, and an output from the light receiving part at a time of irradiating at least one laser beam from the light projecting part to a second place deviated to another side in the circumferential direction of the spectacle lens from the measurement object, are equal to each other.

7. The lens shape measurement device according to claim 6 , wherein
the relative position altering unit includes:
XY-axes moving systems that alter a relative position between the spectacle lens and the laser displacement meter in a direction parallel to a plane including the measurement reference axis of the laser displacement meter;
a Z-axis moving system that alters the relative position between the spectacle lens and the laser displacement meter in a direction vertical to the plane; and
a θ-axis rotation system that rotates the spectacle lens around a rotation axis vertical to the plane, and

the drive controller controls drive of the XY-axes moving systems, the Z-axis moving system, and the θ-axis rotation system so that a normal line passing through the measurement object coincides with the measurement reference axis, and the measurement object is positioned at the focal position.

8. The lens shape measurement device according to claim 7 ,
wherein the XY-axes moving systems including:
an X-axis moving system and a Y-axis moving system composed of two different moving axes, in a mutually structurally separated state,
wherein the laser displacement meter is attached to one of these X-axis moving system and Y-axis moving system, and the θ-axis rotation system supporting the spectacle lens is attached to the other moving system.

9. The lens shape measurement device according to claim 8 , wherein the laser displacement meter is attached to one of the moving systems through the Z-axis moving system.

10. A lens shape measurement device, comprising:
a supporting unit that supports a spectacle lens edged based on edging data;
a laser displacement meter having
a light projecting part configured to obliquely irradiating a measurement reference axis with a laser beam, and
a light receiving part configured to receive the laser beam which is irradiated to each measurement object of a plurality of measurement objects set on an edge surface of the spectacle lens from the light projecting part and reflected by the measurement object,
the laser displacement meter being translatable along X and Z axes,
wherein an intersection point of the measurement reference axis and the laser beam irradiated from the light projecting part is set as a focal position;

Assignees

• Samukawa Masahiko
• Daimaru Takashi
• Takeda Nobuhiko
• Hoya Corp

Inventors

• Samukawa Masahiko
• Daimaru Takashi
• Takeda Nobuhiko

Classifications

• G01M11/025

  by determining the shape of the object to be tested (measuring contours or curvatures by optical means G01B11/24) · CPC title

• G01B11/24 Primary

  for measuring contours or curvatures · CPC title