JPS62227114A - Method and device for point marking of lens - Google Patents

Abstract

PURPOSE:To easily discriminate whether or not a pair of spectacles have lenses put in its frame by judging whether or not the positions of the eyes on which a pair of lenses with marked lenses are put are within the distribution area of designated degrees. CONSTITUTION:A sequencer 203 operates a detector 1 to measure the long-sight prism degree of a lens. Detection data from the detector 1 is processed by a processing part 207 into prism degree data successively, which is inputted to a comparing circuit 206. The comparing circuit 206 reads criterion prism degrees ¦PX¦<0.3 and ¦PY¦<0.03 out of a ROM 212 and compare them with prism degree measurement data from a processing part 207 to input the result to the sequencer 203. An initial control circuit 204 operates an X-axial motor 12M through a pulse driver circuit 200 on the basis of a PD value and moves the lens so that a specified PD point, i.e. measurement point is on the optical axis '0'.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to an automatic marking method and an automatic marking device for a progressive multifocal lens used together with a lens meter.

(Background Art) In recent years, there has been an increasing demand for seamless progressive multifocal lenses for the correction of early presbyopia in middle-aged and elderly people.

This progressive multifocal lens has a distance portion, a near portion, and a progressive band connecting the two that are continuously constructed of complex aspherical surfaces. It is not possible to know the refractive characteristic measuring section or the near refractive characteristic measuring section. Here, the refractive characteristic is used as a general definition of spherical power, cylindrical power, cylindrical axis angle, and prism power.

For this reason, each lens manufacturer applies various markings to the uncut lenses delivered to eyeglass stores before they are inserted into the lens rims of eyeglass frames. Figure 9 shows an example of this.
310 is a horizontal reference line, 311 is a diamond mark, 315 is a mark indicating the geometric center and optical center, 312 is a crosshair indicating a fitting point, 313 is a distance refractive characteristic measurement section indicator mark, 316 is a near refractive characteristic measurement 314 is a near addition power display, and 317 is a manufacturer's mark.

When measuring the distance refractive properties of this lens with a lensmeter, the measurement optical axis of the lensmeter should be located within the circle marked 313, and the mark 313 should be aligned with the center of the lens holder of the lensmeter. Set the lens on. When measuring near refractive characteristics, the lens is set so that the circle mark 316 matches the lens holder. Furthermore, if necessary, if you want to know the refractive characteristics at the fitting point, click the intersection 312 of the crosshairs 312.
Set the lens so that a matches the center of the lens holder.

(Problems to be Solved by the Present Invention) As mentioned above, the current progressive multifocal lens having the above-mentioned configuration has a complex aspherical structure around the progressive zone and the near vision area. It is necessary to fit the lens into the eyeglass frame so that the presbyopia to be worn is precisely positioned in the eyeglass frame.

However, after the lens is fitted into the eyeglass frame, the diamond mark 311 and near addition power display 314 are displayed.
, and the maker's mark 317 are all erased.

However, since the refractive surface of the progressive multifocal lens is a high-order functional curved surface, the astigmatism distribution and the equirefractive power value distribution curve of the near addition power distribution have a complicated shape. For this reason, it is not only extremely difficult to determine the position of the near measurement part using a try-and-meter, but also, for example, depending on the lens, the near measurement part position may be at the maximum addition position and/or astigmatism (cylindrical dust). ) In some cases, a location other than the minimum location was specified, and it was sometimes impossible to determine the measurement area using a trial-and-error method or to mark that location.

As a countermeasure for this, each lens manufacturer has a check card. By preparing a separate transparent card showing the various marks shown in Figure 9 and matching the diamond mark on the check card with the diamond mark 311 remaining on the framed lens, distance or near vision on the check card can be adjusted. Based on the refractive characteristic measurement unit instruction mark, mark the lens with a marker pen, etc. along the mark, and have the person wear the marked glasses to wear them during distance vision work and near vision work. Based on the positional relationship between the position of presbyopia and the marked position of the instruction mark, the user was forced to perform the extremely complicated task of determining whether the lens is correctly fitted or whether the fitting of the eyeglass frame is accurate. .

Furthermore, this check card is not necessarily kept by all lens manufacturers in all eyeglass stores, and the current situation is that without the check card, it is impossible to measure or mark at all.

Furthermore, even if there were a check card, there was a problem in that the mark remaining on the lens after the frame was inserted was very faintly displayed on the lens, making it extremely difficult to find the mark itself.

Furthermore, when marking or marking the distance and near vision areas using a check card, the diamond mark on the lens and the respective positions of the distance vision measuring part 13 and the near vision measuring part 16 of the lens are individually aligned. It is assumed that there is no variation among the lenses, that is, there are no individual differences. Therefore, if an error occurs in the positional relationship between these three parts due to a mistake made by the lens manufacturer in manufacturing the lens, it is no longer possible to accurately determine the position of the measuring section and make markings or points.

In this way, with the conventional method, it is not possible to mark the near measurement part of the lens, that is, the part that the lens wearer is designated to look through during near vision work, so it is difficult to make sure that the wearer is correctly refractive corrected. It was not possible to determine whether or not the user was wearing the glasses so as to use the near vision area.

An object of the present invention is to eliminate the above-mentioned conventional drawbacks, and to provide at least the near vision portion of the lens without using a check card.
It is an object of the present invention to provide a lens marking method and apparatus for measuring the addition power and marking based on the result.

[Structure of the invention]

(Means and effects for solving the problems) The present invention includes a first step of determining the maximum addition power of a progressive multifocal lens;
A second step of creating a cylindrical power boundary value based on the obtained maximum addition power, and measuring the cylindrical power at a plurality of measurement points of the lens, and comparing the measured cylindrical power and the cylinder power boundary value. This lens marking method is characterized in that a marking point is placed on or near a measurement point where the measured cylindrical power is smaller than the cylinder power boundary value.

The present invention also provides a measuring means for automatically measuring the refractive properties of a progressive multifocal lens at a plurality of measurement points, a selection means for selecting a maximum addition power from the addition power measurement result by the measuring means, and a selection means for selecting the maximum addition power from the addition power measurement result by the measurement means. a retention means for creating a cylindrical power boundary value based on the power; a comparison means for comparing the cylindrical power measurement result of the lens by the measuring means with the cylindrical power boundary value; and a measured cylindrical power smaller than the cylinder power boundary value. This is a lens marking device characterized by comprising a marking means for marking on or near a measurement point having a measurement point.

(Example) Mechanical configuration of the first embodiment device Fig. 1 schematically shows the mechanical configuration of the automatic marking device for a lens meter according to the present invention.
Please refer to the patent application filed by the same applicant on February 27, 2007, titled "Automatic alignment device for test lens and automatic marking device including the same."

This automatic marking device includes a support mechanism section 10 for holding and moving a lens to be examined or a spectacle frame in which the lens is framed, and a lens holding section 20 for holding down the lens to be examined.
, a marking part 30 for marking the lens to be tested, and a stand 40 for receiving the lens to be tested.

The support mechanism section 10 includes a Y-axis motor II consisting of a pulse motor.
M, and a Y-transport mechanism 11 that moves the X-axis feed mechanism section 12 along the Y-axis direction by the rotation of the motor 11M, for example, by a feed screw mechanism, and a pulse motor 12M, and the rotation thereof An X-axis feed mechanism 12 that moves the hand opening/closing part 13 along the X-axis direction using, for example, a feed screw mechanism.
and has.

The hand opening/closing part 13 is attached to a belt of a driving part that is composed of a driving pulley rotated by a hand motor 13M, which is a DC motor, for example, a driven pulley, and an endless belt stretched between both the pulleys. , and two hand support seats that move in opposite directions along arrows 131 and 132 by rotation of a motor 13M.

Each hand support seat has arrows 133 and 134 independently.
Hand tables 135 and 136 are mounted so as to be movable up and down within a predetermined range along the direction, that is, along the X-axis direction. Arm 1 of hand table 135.136
37 and 138 have inner contact surfaces 141 and 151 that hold the edge surface of the uncut lens, and outer contact surfaces 142 that contact the temple T of the eyeglass frame F as shown in the figure.
．． 152 and the left and right hands 14.15 are the shaft 14
3.153 is rotatably attached.

The lens holder base 40 includes a cylindrical member 42 having an opening 41 through which the optical axis 0 of the measurement optical system of the lens meter into which the automatic marking device of the present invention is incorporated is installed, and the upper end of the cylindrical member 42. The three lens holders are composed of pins 43.

The lens holding part 20 is moved along the X-axis direction by a lens holding table 2 by a lens holding motor 20M consisting of a DC motor.
It has a lens presser feeding mechanism 22 for vertically moving the lens holder 1,
A lens holding seat 26 having three lens holding pins 25 is provided at the tip of a support 24 extending downward from the arm 23 of the lens holding table 21.

The marking part 30 on the lens holding table 21 is the feeding mechanism 31.
is fixed. The feed mechanism 30 incorporates a mark moving motor 30M, which is a pulse motor, for moving the mark base 32 in the direction of the arrow 33. mark base 3
A marking pin 35 that is pushed out in the X-axis direction by a moving coil 34 is attached to 2. mark base 3
2 is in the initial position, an ink fountain 36 is installed below the marking pin 35.

Control Drive Circuit System FIG. 2 is a block diagram showing the control drive circuit system of the automatic marking device of the present invention. For more detailed circuit configuration, please refer to the above-mentioned prior application. X-axis motor 12M1 Y-axis motor 11M1
The point moving motor 30M is connected to a pulse generator and a pulse driver circuit 200 that controls the supply of pulses from the pulse generator to each motor. Lens presser motor 20
The M1 hand motor 13M is connected to a constant current control circuit 201, and is driven by a constant current, so that the lens pressing pressure and the holding pressure of the frame F by the hands 14 and 15 are kept constant. The mark moving coil 34 is the driver circuit 20
Connected to 2.

The above pulse driver circuit 200, constant current control circuit 201
, driver circuit 202 is connected to and controlled by a sequencer 203 consisting of a microcomputer.

The sequencer 203 includes an initial control circuit 204 for controlling the holding of the lens to be tested and the initial holding and positioning of the eyeglass frame F, as well as an initial control circuit 204 for controlling the refractive characteristics of the lens to be tested based on information from the comparison circuit 206 and the detector 1. A refractive characteristic measurement value processing unit to be determined, a RAM 211, an arithmetic circuit 209, a program memory 213, and an alignment selection switch 205 are connected.

e.g. CR for displaying the measured refractive properties of the lens.
A display 208 consisting of a T-display or a liquid crystal display is connected to the processing section 207. RAM211
is connected to the comparison circuit 206, the arithmetic circuit 209, the sequencer 203, and the initial control circuit 204. A far/near position input keyboard 210 is connected to this RAM 211 . ROM212 is the arithmetic circuit 2
09 and the initial control circuit 204.

FIG. 3 is a flowchart showing the operation of the automatic marking device of the present invention to hold a spectacle frame in which a lens to be examined is inserted.

Step S-1> The initial control circuit 204 is connected to the program memory 213.
According to the program, the hand motor 13M is operated via the constant current control circuit 201 to move the hands 14 and 15 in a direction that narrows the distance between them.

Step S-2> The measurer places the eyeglass frame F containing the eyeglass lens to be marked on the closed hand 14.15.

Step S-3> The initial control circuit 204 reverses the hand motor 13M via the constant current control circuit 201, and the hand 14.1
The outer abutment surfaces 142 and 152 are brought into contact with the temples T of the frame F with a constant pressure at an interval of 5, and the frame F is held.

Step S-4> The initial control circuit 204 determines whether or not the marking points for the right eye have been completed. If YES, the process moves to step S-8; if NO, the process moves to the next step S-5.

Step S-5> In order to position the right eye lens on the optical axis O of the measurement optical system 1, the initial control circuit 24 generates a pulse number corresponding to half the distance of the predetermined PD value stored in advance in the ROM 212. is read out, and the X-ray motor 12M is rotated via the pulse driver circuit 200 to move the hand opening/closing section 13.

<Step S-6> The initial control circuit 204 operates the lens presser motor 30M via the constant current control circuit 201 to lower the lens presser table 21. This causes the lens holding pin 25 to press the right eye lens.

As a result, the right eye lens is held with sufficient stability because the lens holder of the lens holder 40 is held between the pin 43 and the lens holding pin 25, and the frame F is held by the hands 14 and 15.

Step S-7> After marking is performed by a marking subroutine to be described in detail later, the process returns to step S-4, where it is determined whether or not the right eye is finished. If it is determined that the right eye is finished, the process moves to step S-8.

Step S-8> The initial control circuit 204 is the lens presser motor 20M.
After reversing the lens holder and returning the lens holder to its initial position, the X-axis motor 12M is rotated in the opposite direction to step S-5, and the hand opening/closing portion is rotated by a distance corresponding to the predetermined PD value stored in the ROM 212. Move 13.

Step S-9> and Step 5-10> perform the same operations as step S-6 and step S-7, respectively.

Mark point subroutine Step 1> The measurer operates the alignment selection switch 205 and selects “
Mark based on ``optical center'' or ``frame geometric center''
Select whether to mark based on the standard.

The "frame geometric center" criterion is selected when the test lens is, for example, a lens that has been subjected to brism thinning processing and whose distance optical center is outside the lens. If the "optical center" criterion is selected, proceed to step 2; if the "frame geometric center" criterion is selected, proceed to step 4.

Step 2> The measurer learns the product name by checking the manufacturer's mark 317 (see Figure 9), and enters this on the position manual keyboard 2.
Enter from 10. From the manual issued by the lens manufacturer, determine the optical center (
If the distances A, B, and C from the geometric center) 315 are known, the distance/near position manual keyboard 210
Manipulate the value and manually calculate the value. Input data is RAM21
1 is stored. If the distance data ASBSC is not available manually, distance data (distance data of a lens with a high market share) stored in the ROM 212 in advance is used.

Step 3> The sequencer 203 activates the detector 1 and measures the distance prism power of the lens. Detection data from the detector is sequentially processed into prism power data by a processing unit 207 and inputted to a comparison circuit 206 .

The comparison circuit 206 uses the judgment reference prism power IP1+1<0.03 and IP,1<0 stored in the ROM 212.
．． 03 is compared with the prism power measurement data from the processing unit 207, and the result is sent to the sequencer 20.
Enter 3.

The sequencer 203 controls the X-axis motors 12M and Y via the pulse driver circuit 200 until the prism measurement data PX%゛Py becomes IP, l<0.03.1Pyl<0.03.
The axis motor lIM is operated to move the lens, and the lens movement position determined by the comparator circuit 206 to , ○, ) in the RAM 211. After that, the process moves to step 10.

Step 4> If the “frame geometric center” criterion was selected in step 1 above, the measurer should calculate the PD value (
Enter the distance between the geometric centers (or the distance between the wearer's pupils).

When no PD value is input, a PD value predetermined as a standard value and stored in the ROM 212 is used.

Step 5> The same operation as in step 2 above is performed.

Step 6> The initial control circuit 204 operates the X-axis motor 12M via the pulse driver circuit 200 based on the PD value in Step 3, and moves the lens so that the designated FD position, that is, the measurement point is on the optical axis 0. Moving. For example step 2
The human power PD value is 68m/m, and the ROM of this marking device
The standard PD value stored in 212 is 64m/m.
In the case of (68-64)+2=2m, since the FD is located at the standard position of 64m/m in step S-5.
The specified PD position is positioned on the optical axis O by moving the hand opening/closing part by /m minutes.

Step 7> The sequencer 203 operates the detector 1 and at the same time operates the Y-axis motor IIM via the pulse driver circuit 200 to move the lens in the Y-axis direction. The RAM 211 stores the number of pulses to be supplied to the Y-axis motor lIM until the upper rim UL of the lens frame LF of the frame F (see Fig. 10) is located on the optical axis 0 and measurement by the detector 1 becomes impossible.
be temporarily stored in the memory.

Step 8> The sequencer 203 controls the pulse driver circuit 200 to reverse the Y-axis motor IIM so that the lower rim LL is aligned with the optical axis 0.
The number of pulses supplied to the Y-axis motor 11M until the Y-axis motor 11M reaches the upper position is temporarily stored in the RAM 211.

Step 9> Upper rim LIL obtained in steps 7 and 8
and half the difference between the number of pulses supplied to the Y-axis motor 11M until detection of the lower rim LL, and from the result and the position in step 6, as shown in FIG. Determine (G,,G, ).

<Step 10> The sequencer 203 reads from the RAM 211 the distance measurement unit distance A manually inputted in step 2 or step 4 (if there is no input, the predetermined value stored in the ROM 212, the same applies hereinafter), and the pulse driver circuit 200 to drive the Y-axis motor IIM to drive the optical center (08, O,) determined in sub-step 1 if the "optical center" reference was specified in step 1 or the "geometric center" reference in step 1. At the specified time, the lens is moved a distance A from the geometric center (GX, GY) determined in sub-step 2 to align the distance measurement unit 313 with the optical axis 0 of the measurement optical system 1. (If Δ is not input in step 2 or 5, the lens' original distance measurement section 313 does not match the optical axis 0.) Step 11> The sequencer 203 operates the detector 1 and the processing section 207. The refractive characteristics of the distance measurement unit 313 are measured, and the results are displayed on the display 208, and the results are stored in the RAM 211 as a reference distance spherical power MS and a reference distance cylindrical power MC.
to be memorized.

Step 12> The sequencer 203 reads out the near measurement distances B and C input in step 2 or step 4 from the RAM 211, and outputs them to the X and other motors 12 via the pulse driver circuit 200.
The M and Y motors 11M are operated to move the near vision measuring section 316 of the lens onto the optical axis 0. (If there is no human power for 81C in step 2 or 5, the lens' original near measurement section 316 and optical axis 0 do not match.) Step 13> The sequencer 203 controls the X and other motors 12M via the pulse driver circuit 200. The lens is operated to move the lens sequentially toward the nasal side and the ear side, and the refractive characteristic values S (spherical power) and C (cylindrical power) of the lens are input manually from the processing unit 207 to the arithmetic circuit 209 at every moment during movement. The processing unit 207 calculates the near addition ADD from the reference distance spherical power MS and the reference near spherical power MC from the momentary near refractive characteristic measurements S and C, and inputs it to the comparison circuit 206 . Comparison circuit 2
06 is the movement position of the lens having the maximum value ΔDD from the ADD values inputted every moment from the processing unit 207, K+
(x□, yKl) and outputs the position information to the sequencer 203. At the same time, the maximum near addition power A
The DDM is stored in the RAM 211. Based on the position information +(Xw+, yl,), the sequencer 203 operates the X other motor 12M and the Y other motor 11M to move the lens to the position (x,...,y,!1). .

Step 14> The arithmetic circuit 209 reads the maximum near addition power ADD stored in the RAM 211 and a constant stored in advance in the ROM 212, sets the cylindrical power boundary value C8 as an example, and sets this value as It is stored in the RAM 211.

<Step 15> As shown in FIG. 5, step 2 or step 5
If you do not have the human power to put the specified value of the distance part input in ROM
The coordinates of the predetermined position Eo stored in the RAM 211 or the ROM 212 are read out from the RAM 211 or the ROM 212, and based on this, the X and other motors 12M and the Y and other motors IM are driven so that the measurement point is at the specified distance position E. Make sure it's on top.

In addition, in FIG. 5, either the position of the distance measurement part was not specified in step 2 or 5, or the specified value was set incorrectly, and the original distance measurement part 313 of the lens to be marked and the specified position E. The figure shows an example in which the values are different.

Step 16> The sequencer 203 supplies the same number of pulses to the X other motor 12M and the Y other motor 11M via the pulse driver circuit 200 in synchronization with each other to move the measurement point toward the nose in a 45° direction. move. The measured cylindrical power C at every measurement point while the lens is moving is manually inputted from the processing section 207 to the arithmetic circuit 2091. Arithmetic circuit 209 is RAM
The reference distance cylinder power MC determined in step 10 stored in the memory 211 is read out, the reference distance cylinder power MC is subtracted from the measured cylinder power C, and the value (C-MC) is input to the comparison circuit 206. do.

The comparison circuit 206 compares C-MC> between (C-MC) and the cylinder power boundary value C1 stored in the RAM 211.
A comparison is made to determine whether or not C, -■ is satisfied, and when the formula (■) is "satisfied", that fact is manually input to the sequencer 203.

The sequencer 203 continues to drive the X-axis motor 12M and the Y-axis motor 11M to continue moving the lens until a "satisfactory" command is received from the comparison circuit 206. The sequencer 203, which receives the "satisfied" command from the comparison circuit 206, stops the motors 12M and IIM and proceeds to the next step 17.

Step 17> The sequencer 203 supplies the same number of pulses to the X-axis motor 12M and the Y-axis motor 11M via the pulse driver circuit 200, and reverses the movement route of the previous step 16.

The processing unit 207 inputs to the arithmetic circuit 209 the measured cylindrical power C at measurement points that are sometimes measured while the lens is being moved. Arithmetic circuit 209 calculates (C-MC) and inputs the value to comparison circuit 206.

The comparison circuit 206 determines whether or not C-MC≦C,■ holds true between the cylinder power boundary value C8 stored in the RAM 211 and the calculated value (C-MC), and if it holds true, the sequencer A command to that effect is output to 203.

Upon receiving the command from the comparison circuit 206, the sequencer 203 stops the operation of the X-axis motor 12M and the Y-axis motor IIM, stops the movement of the lens, and operates the mark moving motor 30M and the driver circuit 202 to meet the condition 0.
A mark is placed on the measurement point E1 where the formula holds. At the same time, R
1 is stored in the memory address of the mark number R of AM211.

Step 18 > The sequencer 203 reads the distance a stored in the ROM 212 as a constant in advance, supplies pulses to the Y-axis motor 11M for this distance a, and moves the measurement point by a distance in the near vision direction to move the lens toward distance vision. move in the direction.

Step 19> The sequencer 203 then drives the X-axis motor 12M,
The lens is moved to move the measurement point toward the nose, and a measurement point that satisfies the above-mentioned condition 0 is found.

<Step 20> Receiving a command from the comparison circuit that condition 0 is satisfied, the sequencer 203 reverses the X-axis motor 12M and moves the measurement point toward the ear side. During this movement of the measurement point, the comparison circuit 20
When the sequencer 203 receives a command from 6 indicating that condition 0 is satisfied, the sequencer 203 stops the X-axis motor 12M and marks the measurement point E, (here n=2) that satisfies condition 0. At the same time, the number of marks R is updated by one in the RAM 211.

(Here, R=2.) Step 21> The sequencer 203 checks whether the number of marks R stored in the RAM 211 is "6".

If it is less than r6J, repeat steps 18 to 20 until the number of marks R becomes R=6, and as shown in FIG. 5, mark points El to E are placed on the nose side.

get it. When the number of marks R is "6", the process moves to the next step 22.

Step 22> Specified distance position E. In order to return the measurement point to , the lens is moved by driving the X-axis motor 12M1 and the Y-axis motor 11M.

Step 23> Steps similar to steps 16 to 21 described above are executed to find a measurement point E that satisfies condition 0 as shown in FIG.
, / to E6'. However, in this step, the "nasal side" in step 16 is changed to "aural side", the "nasal side" in step 19 is changed to "aural side", and the "aural side" in step 20 is changed to "nasal side". are different.

By executing the above marking point SUB routine, as shown in FIG. 6, the marking point is placed on or slightly inside the cylinder power boundary value 00 line. For example, if the maximum addition power is 1.50 D, the cylindrical power boundary value C1 is 0.50 D from the equation (2). For lenses whose distance refractive properties are only spherical power MS, C.
A point is marked on the =0.50D line. Also, if the standard distance cylinder power MC is MC=1.25D, C-125≦
It becomes 0.5D and is marked on the isocylindrical power line of C=1, 75D.

Second Embodiment FIG. 7 is a flowchart showing the marking subroutine of the lens marking method of the present invention.

Step 2-1> Steps similar to steps 1 to 17 of the first embodiment described above are executed.

Step 2-2> Based on the x-X coordinate values of the marking point position El (X, 1% xyi+), it is determined that X=XE1%YmiVEI and S=θ1.

Step 2-3> To determine a new measurement point, select measurement point El (Xtxy+)
Let the X coordinate and the X coordinate of . Note that, as shown in FIG. 8, T is a constant that can be incremented by 1 arbitrarily and is stored in the ROM 212 as a constant in advance. In addition, θ1 is also arbitrarily determined and the angle is set to ROM2.
12 is stored in advance. For example, θ is obtained as 210°. The arithmetic circuit 209 stores T and θ1 in the ROM2.
12 and also mark position El (XIllSVa
+) is read from the RAM 211, and the above formula (C
), a new measurement point Et (xt, yt) is determined, and this coordinate data is input to the sequencer 203.

Step 2-4> Based on the measurement point coordinate values Et (Xi++, yl, l) from the calculation circuit 209, the sequencer 203 drives the X-axis motor 12M and the y-axis motor IIM to move the measurement point to the optical axis 0. Move the lens to move up.

Step 2-5> The cylinder power C is measured at the measurement point E+ (XRIs 37it), and the arithmetic circuit 209 calculates (C-MC), and then
A comparison circuit 206 determines whether condition 0 is satisfied. When the condition 0 is "satisfied", the process moves to step 2-7, and when it is not "satisfied", the process moves to the next step 2-6.

Step 2-6> In the previous step 2-5, the comparison circuit 206 determined that the measurement point E1 does not satisfy condition 0, so the angle S determined in step 2-2 is changed to S + Δθ (Δθ is an arbitrarily determined unit). (previously stored in the ROM 212), and in step 2-3, a new measurement point E, (x□, y)il) is set as the above (
C) Formula and use Xi =X+T cos (S+Δθ)
Y+ = X+r cos (S+Δθ),
Steps 2-4, 2-5 and this step are repeated until condition 0 is satisfied. In other words, until condition 0 is satisfied, the measurement point E remains at the marked point E, as shown in FIG.
1 and moves on an arc of radius r.

Step 2-7> Mark the measurement point Et determined by the comparison circuit 206 to satisfy condition 0 in the previous step 2-5. Set the mark position to E,
shall be.

Step 2-8> X coordinate of mark position E marked in previous step 2-7
! *s Based on the V coordinate y[R, change the X in step 2-2 to XtlL and the Y to y□.

Step 2-9> In step 17, R determined as R=1 is replaced with R+1.

That is, R becomes R+1=1+1=2. At the same time, the number of marks R in the RAM 211 is replaced with 2.

Step 2-10> The sequencer 203 determines that the number of markings R in the RAM 211 is “6”.
If the result is "6", proceed to the next step 2-11, and if the result is "no", proceed to the steps 2-3 or 2 described above.
-9 is repeated until the number of marks R becomes "6".

Step 2-11> The sequencer 203 has an X-axis motor 12M and a Y-axis motor II.
Specify the measurement point by driving M to distance position E.

Move the lens to return to .

Step 2-12> The sequencer 203 controls the X-axis motor 12M and the Y-axis motor 1.
The same number of pulses are supplied to the IM in synchronization with each other, and the lens is moved so that the measurement point moves toward the ear in a 45° direction.

The comparison circuit 206 compares the C-MC value from the arithmetic circuit 209 for each measurement point during lens movement with the cylindrical power boundary value C@ stored in the RAM 211, and determines whether the condition 0 expression is satisfied. and move the measurement point to the ear side 4 until this is satisfied.
Move along the 5° direction.

<Step 2-13> When a measurement point that satisfies condition 0 is found, the sequencer 203 simultaneously reverses the X-axis motor 12M and Y-axis motor IIM, and moves along the measurement point movement route in the previous step 2-12. The measuring point is moved in the opposite direction and marked at the measuring point E,' where the comparator circuit 206 determines that condition 0 is satisfied. At the same time, the mark position E+'(X!1', yEl'
) are stored in the RAM 211, and the number of marks R
is stored in the RAM 211 as 1.

Step 2-14> Similar to step 2-2 above, mark point position El'(XE
I',y! 1′) based on X=x,,′,YmyEl
', and 5=02. Here, θ2 is a predetermined arbitrary constant and is stored in the ROM 211 in advance. In the example of FIG. 8, θ2 is 30''.

Step 2-15> The same operations as steps 2-3 to 2-10 described above are performed to mark Em'.

In the first and second embodiments described above, marks are placed on both the distance and near vision parts of the lens, but the present invention is not necessarily limited to this, and may be used as necessary. It is also possible to mark only the distance vision area or the near vision area.

Furthermore, in each of the above-mentioned embodiments, a mark is placed on the measurement point that satisfies the condition 0 expression every time the measurement point is determined.
All measurement points that satisfy the equation may be stored in the RAM in advance, and then the marking operation may be continuously performed based on the stored measurement point data.

Also, the mark point position does not necessarily have to be on the measurement point,
A mark may be placed at a point at a predetermined distance from the measurement point as long as it is within a region that satisfies the conditional expression. In order to prevent the dot mark from being erased by the lens holding pin 25 while the lens is moving, it is necessary to calculate the positional relationship between the dot position and the lens holding pin 25 each time the lens is moved, and to carry out measurements one after another. This is effective when determining a point, that is, a marking point position.

〔Effect of the invention〕

According to the present invention, it is possible to indicate the distribution area of the addition power required by the eyeglass wearer during near vision work using the marked points. For this reason, it is determined whether or not the position of the wearing eye is within the distribution area when the eyeglasses having the marked lenses are worn, and from this it is determined whether the lenses are correctly fitted in the glasses. can be identified very easily.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the mechanical components of the lens marking device of the present invention, FIG. 2 is a block diagram showing the circuit configuration of the electrical control system of the lens marking device, and FIG. 3 is a diagram showing the circuit configuration of the electrical control system of the lens marking device. Flowchart showing the operation routine; FIGS. 4(A) and 4(B) are flowcharts showing a first embodiment of the mark subroutine of the flowchart in FIG. 3; FIG. 5 is a flowchart showing the first embodiment of the lens according to the first embodiment 6 is a schematic diagram showing the relationship between the marking point position and the cylinder power boundary value line according to the first embodiment, and FIG. 7 is a schematic diagram showing the relationship between the marking point position and the cylinder power boundary value line according to the first embodiment. A flowchart showing a second embodiment of the marking point subroutine of the flowchart, FIG. 8 is a schematic diagram showing the lens marking point position according to the second embodiment together with the measurement point movement route,
FIG. 9 is a diagram showing an example of markings on an unprocessed progressive multifocal lens, and FIG. 10 is a schematic diagram showing the relationship between a designated distance position and a designated near position. 1... Measurement optical system and detector, 11...
・Y-axis travel mechanism, 12...X-axis feed mechanism, 14
．． 15... Hand, 20... Lens holding part, 203... Sequencer, 206...
... Comparison circuit, 209 ... Arithmetic circuit, 211.
...RAM. 212...ROM0 Figure 3

Claims (4)

[Claims] (1) A first step of measuring the add power in a certain area of the near vision part of the progressive multifocal lens and calculating the maximum add power, and determining the cylindrical power boundary value (C_e) based on the maximum add power.
a second step of determining the cylindrical power (C) of a plurality of measurement points on the progressive multifocal lens;
), and a third step in which the measured cylindrical power (C) is smaller than the cylindrical power boundary value (C_e) and the mark is placed on or near the measurement point. (2) If the lens has a distance cylindrical power (MC) in comparison with the cylinder power boundary value (C_e) in the third stage, the distance cylindrical power (MC) is subtracted from the measured cylinder power (C). The lens marking method according to claim 1, characterized in that the method is performed for the difference (C-MC). (3) Measuring means for automatically measuring the refractive properties of a progressive multifocal lens at a plurality of measurement points; and determining a maximum add power from the add power at the plurality of measurement points measured by the measuring means. a selection means for selecting; and a cylinder power boundary value (C_e) based on the maximum addition power.
a boundary value determination means for determining the cylinder power at a plurality of measurement points on the lens, and a cylinder power for comparing the measured cylinder power (C) with the cylinder power boundary value (C_e). Comparing means; and marking means for placing a mark on or near the measurement point where the comparison means determines that the measured cylinder power (C) is smaller than the cylinder power boundary value (C_e). A lens marking device characterized by: (4) The comparison means may be configured such that the lens has a distance cylindrical power (M
C), it includes a calculation means for calculating the difference (C-MC) between the measured cylinder power (C) and the distance cylinder power (MC), and calculates the difference (C-MC) and the cylinder power boundary value. (C_
The lens marking device according to claim (3), characterized in that it is configured to compare with e).