Geometrical instruments – Scriber – Curved line
Reexamination Certificate
1998-07-31
2001-07-24
Gutierrez, Diego (Department: 2859)
Geometrical instruments
Scriber
Curved line
C033S200000, C033S507000
Reexamination Certificate
active
06263583
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a method of measuring an eyeglass frame, and an eyeglass frame measuring apparatus which are used for grinding an eyeglass lens on the basis of measurement data of an eyeglass frame, and also to an eyeglass lens grinding apparatus.
An apparatus is known which measures the frame configuration of an eyeglass frame and grinds an eyeglass lens on the basis of data of the measurement. In such a process, a method in which the process is performed on the basis of frame configuration data for each of the right and left eyes may be employed. In the case where right and left frame configurations are different from each other, when lenses are processed so as to respectively conform to the configurations, however, the resulting eyeglass may look strange. Therefore, such a process is usually performed by using data in which data for one of the right and left configurations is set as a reference and data for the other configuration is obtained by inverting (mirror-inverting) the reference data.
Usually, the right and left frame configurations of an eyeglass frame are substantially bilaterally symmetrical with each other. However, it is not rare that the positional relationship between the right and left frames are slightly relatively rotated as shown in
FIG. 8
due to a problem in production. This easily occurs particularly in an eyeglass frame such as a metal frame which is produced by separately producing right and left frames and then bonding the frames together via a bridge. Furthermore, an eyeglass frame may be deformed during transportation and handling after production. Therefore, in a process using a mirror-inverted data, even when the one lens is processed on the basis of the reference data at a correct axial degree (characteristic), the axial degree of the other lens contains an error, thereby causing a problem in that the axis degree of an eyeglass lens mounted to the frame fails to conform to a predetermined one.
SUMMARY OF THE INVENTION
In view of the problem discussed above, it is an object of the invention to provide a method and an apparatus in which the axial degree or axial characteristic in production of an eyeglass can be improved.
(1) An eyeglass frame measuring apparatus for measuring an eyeglass frame, the apparatus comprising:
frame data input means for entering first and second frame data on the eyeglass frame consisting of first and second frames;
frame data inverting means for inverting the entered first frame data to obtain a third frame data; and
rotational deviation computing means for, on the basis of the third frame data and the second frame data entered through the frame data input means, obtaining an amount of deviation of the second frame data with respect to the third frame data in a rotation direction.
(2) An eyeglass frame measuring apparatus according to (1), further comprising correcting means for correcting the third frame data on the basis of the rotational deviation amount obtained by the rotational deviation computing means, to obtain a fourth frame data.
(3) An eyeglass frame measuring apparatus according to (1), wherein the rotational deviation computing means obtains the deviation amount in the rotation direction when a difference in radius vector length between the second and third frame data corresponding to a radius vector angle is minimum.
(4) An eyeglass frame measuring apparatus according to (1), wherein the rotational deviation computing means obtains the deviation amount in the rotation direction from feature of frame configurations represented by the second and third frame data.
(5) An eyeglass frame measuring apparatus according to (1), further comprising peripheral length calculating means for obtaining peripheral lengths of the two frames on the basis of the first and second frame data.
(6) An eyeglass lens grinding apparatus for grinding a pair of eyeglass lenses such that the eyeglass lenses conform to the configuration of an eyeglass frame, the apparatus comprising:
frame data input means for entering first and second frame data on the eyeglass frame consisting of first and second frames;
frame data inverting means for inverting the entered first frame data to obtain a third frame data;
rotational deviation computing means for, on the basis of the third frame data and the second frame data entered through the frame data input means, obtaining an amount of deviation of the second frame data with respect to the third frame data in a rotation direction;
correcting means for correcting the third frame data on the basis of the rotational deviation amount obtained by the rotational deviation computing means, to obtain a fourth frame data;
layout means for providing a layout of the eyeglass lenses with respect to the first and fourth frame data;
bevel position determining means for determining a position of a bevel in a thickness direction on an edge of each of the eyeglass lenses for which the layout is provided by the layout means; and
controlling means for grinding each of the eyeglass lenses on the basis of the layout provided by the layout means and the bevel position provided by the bevel position determining means.
(7) An eyeglass lens grinding apparatus according to (6), wherein the controlling means comprises:
peripheral length calculating means for obtaining first and second peripheral lengths on the basis of the first and second frame data; and
computing means for obtaining process data from the first frame data so as to be substantially coincident with the first peripheral length, and process data from the fourth frame data so as to be substantially coincident with the second peripheral length.
(8) A method of measuring an eyeglass frame, the method comprising:
a first step of measuring first and second frames of the eyeglass frame to obtain first and second frame data, respectively;
a second step of inverting the first frame data to obtain a third frame data; and
a third step of, on the basis of the third frame data and the second frame data, obtaining an amount of deviation of the second frame data with respect to the third frame data in a rotation direction.
(9) A method of measuring an eyeglass frame according to (8), wherein the first and third frame data and the rotational deviation amount obtained in the third step are used as frame data for an eyeglass lens grinding process.
(10) A method of measuring an eyeglass frame according to (8), further comprising:
a fourth step of correcting the third frame data on the basis of the rotational deviation amount, to obtain a fourth frame data.
(11) An eyeglass frame and template configuration measuring device comprising:
a configuration measuring section which measures configurations of two frames of an eyeglass to obtain first and second measured frame configuration data;
a program memory which stores a predetermined program therein;
a tracer arithmetic control circuit which, in accordance with the program: converts the first and second configuration data into third and fourth target lens configuration data with respect to boxing centers, respectively; mirror-inverts the third configuration data to obtain fifth mirror-inverted configuration data; and compares the fourth configuration data with the fifth configuration data with respect to a corresponding boxing center to obtain an axial characteristic correction angle; and
a trace data memory which stores the third configuration data and the axial characteristic correction angle therein.
(12) An eyeglass frame and template configuration measuring device according to (11), wherein the tracer arithmetic control circuit calculates peripheral length data based on the first and second configuration data, respectively, and the trace data memory stores the peripheral length data therein.
The present disclosure-relates to the subject matter contained in Japanese patent application No. Hei. 9-220807 (filed on Jul. 31, 1997) which is expressly incorporated herein by reference in its entirety.
REFERENCES:
patent: 4724617 (1988-02-01), Logan et al.
patent: 5138770 (1992-08-01
De Jesus Lydia M.
Gutierrez Diego
Nidek Co. Ltd.
Sughrue Mion Zinn Macpeak & Seas, PLLC
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