Trial frame and method for measuring key parameter thereof

Patent metadata

Field	Value
Publication number	US-10130252-B2
Application number	US-201414481901-A
Country	US
Kind code	B2
Filing date	Sep 9, 2014
Priority date	Jun 11, 2014
Publication date	Nov 20, 2018
Grant date	Nov 20, 2018

Abstract

A trial frame includes a trial frame body and at least one measurement subject having a visual invariant geometric characteristic. The trial frame body has at least one key parameter. The measurement subject is disposed on the trial frame body and collaborates with a measurement method. A two-dimensional image of the measurement subject is recorded by an image capturing device when the trial frame body fits to a user, and the key parameter is deduced from the two-dimensional image of the measurement subject.

First claim

What is claimed is:

1. A trial frame, comprising:
a trial frame body having at least one key parameter, the trial frame body comprising:
a measurement ruler comprising a first fixed portion and a pair of first moving portions respectively movably connected to two ends of the first fixed portion, wherein the first fixed portion has a longitudinal axis, and the first moving portions are configured to move along the longitudinal axis; and
a pair of eyewires respectively physically connected to the first moving portions, wherein the first moving portions are configured to adjust a distance between the eyewires; and

at least one measurement subject which has a visual invariant geometric characteristic and is disposed on the trial frame body for collaborating with a measurement method, wherein a two-dimensional image of the measurement subject is recorded by an image capturing device when the trial frame body fits to a user, the measurement subject comprises three fixed points on the first fixed portion and one moving point on one of the first moving portions, the four points are disposed on the same straight line and on the same plane, the straight line is superimposed on the plane, and the key parameter is deduced from the two-dimensional image of the measurement subject.

2. The trial frame of claim 1 , wherein the trial frame body further comprises:
a pair of nose rests connected to the eyewires; and
a pair of temples, comprising:
a pair of connecting portions connected to the eyewires; and
a pair of ear portions moveably connected to the connecting portions respectively;

wherein the measurement subject comprises a fixed point A, a fixed point B, a fixed point C, and a moving point D; the fixed point A, the fixed point B, and the fixed point C are disposed on one of the connecting portions with equal intervals between each other; the moving point D is disposed on one of the ear portions; and the point A, the fixed point B, the fixed point C, and the moving point D are disposed on the same straight line.

3. The trial frame of claim 1 ,
wherein the three fixed points are disposed with equal intervals between each other.

4. The trial frame of claim 1 , wherein the trial frame body further comprises:
a nose bridge measurement ruler connected to the first fixed portion of the measurement ruler, wherein the nose bridge measurement ruler comprises a second fixed portion and a second moving portion connected to the second fixed portion;
a pair of nose rests connected to the second moving portion; and
a pair of temples connected to the eyewires;
wherein the measurement subject comprises a fixed point A, a fixed point B, a fixed point C, and a moving point D, and the fixed point A, the fixed point B, and the fixed point C are disposed on the second fixed portion with equal intervals between each other; the moving point D is disposed on the second moving portion; and the fixed point A, the fixed point B, the fixed point C, and the fixed point D are disposed on the same straight line.

5. The trial frame of claim 1 , wherein the trial frame body further comprises:
a pair of temples, wherein the eyewires rotatably connected to the temples;
a pair of nose rests respectively connected to the eyewires; and
an angle measuring module fixed to the temples; wherein the angle measuring module comprises a second fixed portion and a second moving portion connected to the second fixed portion; the angle measuring module comprises a fixed point A, a fixed point B, a fixed point C, a moving point D, and a fixed point O; the fixed point A, the fixed point B, and the fixed point C are disposed on the second fixed portion with equal intervals between each other; the point A, the fixed point B, and the fixed point C are disposed on the same straight line; the fixed point O is disposed on the second fixed portion; an angle ∠AOB and an angle ∠BOC have the same magnitudes; the second moving portion has a first end and a second end; the first end of the second moving portion is connected to the fixed point O; the moving point D is disposed on the second end of the second moving portion; the second end is movably connected to the second fixed portion; the connection portion of the second end and the second fixed portion, the fixed point A, the fixed point B, and the fixed point C are disposed on the same straight line; and the second moving portion is fixed to the eyewires, such that when the eyewires are rotated with respect to the temples, the moving point D moves with respect to the second fixed portion, and an angle between the second moving portion and the eyewires is fixed.

6. The trial frame of claim 1 , wherein the trial frame body further comprises:
a pair of temples, wherein the eyewires rotatably connected to the temples;
a pair of nose rests respectively connected to the eyewires; and
an angle measuring module for providing an information showing an angle relationship between the temples and the eyewires.

7. A method for measuring a key parameter of a trial frame, the method comprising:
putting the trial frame of claim 1 on the user's head;
adjusting the key parameter of the trial frame for fitting the trial frame to the user;
recording the two-dimensional image of the measurement subject by the image capturing device; and
deducing a cross ratio corresponding to the key parameter of the trial frame according to the two-dimensional image of the measurement subject, thereby determining the key parameter of the trial frame, wherein the cross ratio is the same when the two-dimensional image of the measurement subject is taken in different recording angles and different recording distances.

8. The method of claim 7 , wherein the measurement subject comprises a fixed point A, a fixed point B, a fixed point C, and a moving point D, and the cross ratio R is deduced from the following mathematical relationship:

R
=

ABCD
_

BCAD
_

.

9. The method of claim 8 , wherein the trial frame further comprises a second fixed portion and a second moving portion; a spatial configuration of the second fixed portion and the second moving portion determines the key parameter of the trial frame; the fixed point A, the fixed point B, and the fixed point C are disposed on the second fixed portion with equal intervals between each other; the moving point D is disposed on the second moving portion, the fixed point A, the fixed point B, the fixed point C, and the moving point D are disposed on the same straight line and on the same plane, and the straight line is superimposed on the plane.

10. The trial frame of claim 1 , wherein the trial frame further comprises a nose bridge measurement ruler physically connected to the first fixed portion of the measurement ruler, and the nose bridge measurement ruler is between the eyewires.

11. The trial frame of claim 10 , wherein the nose bridge measurement ruler has a second fixed portion physically connected to the first fixed portion of the measurement ruler and a second moving portion movably connected to the second fixed portion, and the second moving portion is configured to move along a direction perpendicular to the longitudinal axis of the first fixed portion.

Assignees

• Univ National Chiao Tung

Inventors

• Chuang Jen-Hui
• Hsieh Yi-Yu
• Lin Yen-Shuo

Classifications

• G02C13/003

  Measuring during assembly or fitting of spectacles · CPC title

• A61B3/04 Primary

  Trial frames; Sets of lenses for use therewith · CPC title