JPH076869B2 - Lens meter - Google Patents

Description

The present invention relates to a lens meter capable of detecting a distribution state of refraction characteristics of a progressive power multifocal lens.

(Background Art) In recent years, there is an increasing demand for seamless progressive multifocal lenses for the correction of presbyopia in the middle and old age. This progressive multifocal lens has a distance portion, a near portion, and a progressive zone that connects the two portions continuously formed of a complex aspherical surface. I cannot know the characteristic measurement part and the near refraction characteristic measurement part. Here, the refraction characteristic is used as a general definition of spherical power, cylindrical power, cylindrical axis angle, and prism power. For this reason, each lens manufacturer makes various markings on the uncut lens before delivering it to the lens frame of the eyeglass frame, which is delivered to the eyeglass store, to measure the refraction characteristics in the eyeglass store and to put the frame into the eyeglass frame. FIG. 9 shows an example of such processing, and 310 is a horizontal reference line, 311 is a diamond mark, 315 is a mark indicating the geometric center and the optical center, and 312 is a fitting point. A cross line, 313 is a distance refraction characteristic measuring section instruction mark, 316 is a near refraction characteristic measuring section instruction mark, 314 is a near addition diopter display, 3
17 shows the manufacturer mark respectively.

And when measuring the distance refraction characteristic of this lens with the lens meter, the measurement optical axis of the lens meter is located within the circle of the mark 313, and the mark 313 is aligned with the center of the lens receiver of the lens meter. To set the lens. Also, when measuring near-distance refraction characteristics, set the lens so that the circle of 316 mark matches the lens receiver.
Further, if necessary, if the user wants to know the refraction characteristics at the fitting point, the lens is set so that the intersection 312a of the cross hair 312 matches the center of the lens receiver.

(Problems to be Solved by the Present Invention) As described above, the current progressive-power multifocal lens having the above-described configuration has a complicated aspherical structure around the progressive zone portion and the near portion. It is necessary to frame the lens in the spectacle frame so that the wearer's eye is accurately positioned on the part.

However, in the lens after being framed in the spectacle frame, all but the diamond mark 311, the near addition diopter display 314, and the manufacturer mark 317 are erased.

However, since the refracting surface of the progressive power multifocal lens is a high-order function curved surface, the astigmatism distribution and the near refraction power distribution curve of the addition power distribution have complicated shapes. For this reason, it is extremely difficult to determine the position of the near-distance measuring portion with a try-and-error method. There are some cases where a location other than the minimum location is specified, and it was impossible at all to determine the measurement part by the try and error method or to mark the location.

As a countermeasure against this, each lens manufacturer has a check card. Prepare a transparent card with the various marks shown in Fig. 9 as a separate item, and match the diamond mark of the check card with the diamond mark 311 remaining on the framed lens to make it far or near. Mark on the lens with a marker pen etc. based on the refraction characteristic measuring section instruction mark, and have the marked glasses wear it, and wear it for distance work and near work From the positional relationship between the position of the human eye and the position of the instructed mark, a very complicated task of determining whether the lens is correctly framed or whether the fitting of the spectacle frame is accurate is compelled. It was

Furthermore, this check card is not always stored in all eyeglass stores by all lens manufacturers, and it is the current situation that, without the check card, measurement and marking cannot be performed at all.

Further, even if there is a check card, there is a problem that it is extremely difficult to find this mark because the mark remaining on the lens after being framed is displayed extremely thin on the lens.

Furthermore, when using a check card to mark or mark on the distance portion and the near portion, the positions of the diamond mark on the lens and the distance measuring portion 13 and the near measuring portion 16 of the lens are individually set. It is premised that there is no variation due to the lens, that is, there is no individual difference. Therefore, if an error occurs in the positional relationship between these three members due to a lens manufacturing mistake made by a lens manufacturer, it is no longer possible to accurately determine the position of the measuring portion and perform marking or marking.

As described above, in the conventional method, since the near measurement part of the lens, that is, the position of the portion where the lens wearer is designated to see through the portion during near work cannot mark, the wearer is correctly refracted and corrected. I could not determine at all whether or not I was wearing the glasses to use my near vision.

An object of the present invention is to provide a lens meter which solves the problems of the prior art and can easily know the distribution state of the refraction characteristics of a progressive multifocal lens.

[Structure of Invention]

The present invention, in a lens meter capable of measuring the optical characteristics of a progressive multifocal lens having a distance portion and a near portion, a storage unit for storing a reference cylindrical power of the distance portion, and a reference for the distance portion. It has a computing unit for computing the difference between the cylindrical power and the measured cylindrical power, and is configured to be able to detect the distribution state of the refractive characteristics of the progressive multifocal lens based on the output of the computing unit. It is a characteristic lens meter.

(Embodiment) First Embodiment Mechanical Configuration of Device FIG. 1 schematically shows the mechanical configuration of an automatic marking device for a lens meter according to the present invention. More specifically, it is the same as February 27, 1986. Please refer to the patent application of the title of the invention “Automatic alignment device for a lens to be inspected and automatic marking device having the same” filed by the applicant.

This automatic marking device is a support mechanism portion 10 for holding and moving a lens to be inspected or a spectacle frame in which the lens is framed, a lens pressing portion 20 for pressing the lens to be inspected,
It roughly comprises a marking portion 30 for marking on the lens to be inspected, and a lens pedestal 40 for receiving the lens to be inspected.

The support mechanism unit 10 has a Y-axis motor 11M which is a pulse motor, and the X-axis feed mechanism unit 12 is rotated by the rotation of the motor 11M.
Has a Y-axis feed mechanism 11 that moves along the Y-axis direction by a feed screw mechanism, and a pulse motor 12M, and rotates the hand opening / closing unit 13 along the X-axis direction by the feed screw mechanism, for example. And an X-axis feed mechanism 12 for causing the movement.

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

Hand tables 135 and 136 are attached to the hand support seat independently of each other so as to be vertically movable within a predetermined range along the directions of arrows 133 and 134, that is, movable along the Z-axis direction.
Arms 137 and 138 of the hand tables 135 and 136 have inner contact surfaces 141 and 151 for holding the edge surface of the uncut lens.
And the left and right hands 14, which have outer contact surfaces 142, 152 that contact the temples T of the spectacle frame F, as shown in the figure.
15 is rotatably attached to the shafts 143 and 153.

The lens pedestal 40 has an opening 41 through which the optical axis 0 of the measurement optical system of the lens meter in which the automatic marking device of the present invention is incorporated passes.
And a three-lens receiving pin 43 implanted in the upper end of the cylindrical member 42.

The lens pressing unit 20 is a lens pressing motor composed of a DC motor.
20M has a lens presser feed mechanism 22 for moving the lens presser table 21 up and down along the Z-axis direction, and three lens pressers are attached to the tip of a column 24 which extends downward from an arm 23 of the lens presser table 21. Lens presser seat 26 with pin 25
have.

A feeding mechanism 31 is fixed to the marking point 30 on the lens pressing table 21. The feed mechanism 30 includes a mark point moving motor including a pulse motor for moving the mark point base 32 in the direction of arrow 33.
30M is incorporated. The marking point base 32 is provided with a marking point pin 35 pushed out in the Z-axis direction by the moving coil 34. When the marking point base 32 is in the initial position, the ink fountain 36 is installed below the marking point pin 35.

Control Driving Circuit System FIG. 2 is a block diagram showing the control driving circuit system of the automatic marking device of the present invention. For more detailed circuit configuration, refer to the above-mentioned prior application. The X-axis motor 12M, the Y-axis motor 11M, and the mark movement motor 30M include a pulse generator and a pulse driver circuit 20 that controls the supply of pulses from the pulse generator to each motor.
Connected to 0. The lens pressing motor 20M and the hand motor 13M are connected to the constant current control circuit 201, and are driven by a constant current to keep the lens pressing pressure and the holding pressure of the frame F by the hands 14 and 15 constant. The mark moving coil 34 is connected to the driver circuit 202.

The pulse driver circuit 200, the constant current control circuit 201, and the driver circuit 202 are connected to a sequencer 203 composed of a microcomputer and controlled by the sequencer 203. Sequencer 2
Reference numeral 03 denotes an initial control circuit 204 for holding the lens to be inspected and controlling the initial holding and positioning of the spectacle frame F, and the refraction characteristics of the lens to be inspected are determined based on information from the comparison circuit 206 and the detector 1. Refraction characteristic measurement value processing unit, RAM 211, arithmetic circuit 209 and program memory 2
13 and the alignment selection switch 205 are connected.

For displaying the refraction characteristics of a lens, eg CRT
Display consisting of display or liquid crystal display 20
8 is connected to the processing unit 207. The RAM 211 is a comparison circuit 20.
6, the arithmetic circuit 209, the sequencer 203, and the initial control circuit 204. A far / near position input keyboard 210 is connected to the RAM 211. ROM212
Is connected to the arithmetic circuit 209 and the initial control circuit 204.

Operation Sequence (1) Setting of Eyeglass Frame FIG. 3 is a flowchart showing the operation of the automatic marking device of the present invention for holding the eyeglass frame in which the lens to be inspected is framed.

<Step S-1> The initial control circuit 204 operates the hand motor 13M via the constant current control circuit 201 in accordance with the program in the program memory 213 to move the hands 14 and 15 in the direction of narrowing the interval.

<Step S-2> The measurer places the spectacle frame F containing the spectacle lens to be marked on the closed hands 14 and 15.

<Step S-3> The initial control circuit 204 reverses the hand motor 13M via the constant current control circuit 201, opens the spaces between the hands 14 and 15, and keeps the outer contact surfaces 142 and 152 on the temple T of the frame F constant. The frame F is held by bringing them into contact with each other with pressure.

<Step S-4> The initial control circuit 204 determines whether or not the marking point of the right eye is completed. If YES, go to step S-8, NO
In the case of, it moves to the next step S-5.

<Step S-5> In order to position the right-eye lens on the optical axis 0 of the measurement optical system 1, the initial control circuit 24 sets the number of pulses corresponding to half the predetermined PD value stored in the ROM 212 in advance. The X-ray motor 12M is read and the hand opening / closing unit 13 is moved by rotating the X-ray motor 12M via the pulse driver circuit 200.

<Step S-6> The initial control circuit 204 operates the lens pressing motor 30M via the constant current control circuit 201, and the lens pressing table 2
Lower 1 As a result, the lens pressing pin 25 presses the right eye lens.

As a result, the right eye lens is sandwiched between the lens receiving pin 43 of the lens receiving base 40 and the lens pressing pin 25, and the frame F is held by the hands 14 and 15, so that it is held with sufficient stability.

<Step S-7> After the marking is made by the marking sub-routine described in detail later, the procedure returns to step S-4, and it is determined here whether or not the right eye is finished. When it is determined that the right eye is finished, the process proceeds to step-8.

<Step S-8> The initial control circuit 204 reverses the lens presser motor 20M to return the lens presser to the initial position, and then the X-axis motor.
Rotate 12M in the opposite direction to step S-5, and
The hand opening / closing unit 13 is moved by a distance corresponding to the predetermined PD value stored in 2.

<Step S-9> and <Step S-10> The same operations as those in Step S-6 and Step S-7 are executed.

Marking Subroutine <Step 1> The measurer operates the alignment selection switch 205 to select whether to mark based on the “optical center” reference or the “frame geometric center” reference. The “frame geometric center” reference is selected, for example, when a lens subjected to prism thinning processing and having a distance optical center outside the lens is the lens to be inspected. If the "optical center" criterion is selected, go to step 2; if the "frame geometric center" criterion is selected, go to step 4.

<Step 2> The measurer knows the product name by checking the manufacturer's mark 317 (see FIG. 9), and uses this to input the position input keyboard 210.
Enter from. If the distances A, B, and C from the optical center (or geometric center) 315 of the distance measuring unit 313 and the near measuring unit 316 are known from the manual issued by the lens manufacturer, the distance / near position input is performed. The keyboard 210 is operated to input the value. The input data is stored in the RAM 211. When the distance data A, B, and C are not input, the distance data stored in advance in the ROM 212 (distance data of a lens having a high market share) is used.

<Step 3> The sequencer 203 operates the detector 1 to measure the distance prism of the lens. The detection data from the detector is processed into the prism power data by the processing unit 207, and the comparison circuit 2
Entered in 06. The comparison circuit 206 stores the judgment reference prism powers | P _X | <0.03 and | P _Y | <0.03 stored in the ROM 212.
Is read, and this is compared with the prism power measurement data from the processing unit 207, and the result is input to the sequencer 203.

The sequencer 203 uses prism measurement data P _X and P _y as │P _x │ <
Pulse driver circuit 200 until 0.03, | P _Y | <0.03
The X-axis motor 12M and the Y-axis motor 11M are operated through the lens to move the lens, and the comparison circuit 206 causes the | P _X | <0.03 and | P _Y |
The lens movement position determined as <0.03 is stored in the RAM 211 as the optical center position (O _x , O _y ) as shown in FIG. Then, the process proceeds to step 10.

<Step 4> When the “frame geometric center” reference is selected in Step 1 above, the measurer determines the PD value (distance between geometric centers or distance between the pupils of the wearer) between the test lenses of the left and right eyes. ) Is entered.

If no PD value is input, RO is preset as a standard value.
Use the PD value stored in M212.

<Step 5> The same operation as in step 2 described above is executed.

<Step 6> The initial control circuit 204 operates the X-axis motor 12M via the pulse driver circuit 200 based on the PD value of step 3, and moves the lens so that the designated PD position, that is, the measurement point is on the optical axis 0. Moving. For example, if the input PD value in step 2 is
If the standard PD value stored in the ROM 212 of the main marking device is 64 m / m, the PD64m is 64 m in step S-5.
Since it is located at the standard position of / m (68-64) / 2
The designated PD position is located on the optical axis 0 by moving the hand opening / closing part by 2 m / m.

<Step 7> The sequencer 203 operates the detector 1 and simultaneously operates the Y-axis motor 11M via the pulse driver circuit 200 to move the lens in the Y-axis direction. The Y-axis motor until the upper rim UL (see FIG. 10) of the lens frame LF of the frame F is located on the optical axis 0 and the measurement by the detector 1 becomes impossible.
The number of pulses supplied to 11M is temporarily stored in RAM211.

<Step 8> The sequencer 203 controls the pulse driver circuit 200 to reverse the Y-axis motor 11M and temporarily stores the number of pulses supplied to the Y-axis motor 11M in the RAM 211 until the lower rim LL is located on the optical axis 0. To memorize.

<Step 9> Calculate a half value of the difference between the number of pulses supplied to the Y-axis motor 11M until the upper rim UL and the lower rim LL detected in Steps 7 and 8 are calculated, and the result and the Step 6
As shown in FIG. 10, the geometrical center of the frame (O _x , O _y ) is determined from the position of and.

<Step 10> The sequencer 203 reads from the RAM 211 the distance measuring unit distance A input in step 2 or step 4 (when there is no input, a predetermined value stored in the ROM 212, the same applies hereinafter), and the pulse driver circuit If the Y-axis motor 11M is operated via 200 and the "optical center" reference is specified in step 1, the optical center (O _x , O _y ) determined in substep 1 or the "geometric center" reference in step 1 When A is specified, the distance A from the geometric center (O _X , O _Y ) determined in substep 2
The lens is moved so that the distance measuring unit 313 is aligned with the optical axis 0 of the measuring optical system 1. ) If there is no input of A in step 2 or 5, the distance measuring section 313 originally of the lens does not coincide with the optical axis 0. ) <Step 11> The sequencer 203 operates the detector 1 and the processing unit 207 to measure the refraction characteristics of the distance measuring unit 313, displays the result on the display 208, and displays the result on the reference far spherical power. Stored in RAM211 as MS and reference distance cylinder power MC.

<Step 12> The sequencer 203 reads the near-distance measuring unit distances B and C input from the RAM 211 in Step 2 or Step 4, and operates the X-axis motor 12M and the Y-axis motor 11M via the pulse driver circuit 200 to move the lens. The near measurement unit 316 is moved to the optical axis 0. (If there is no input of B or C in step 2 or 5, the original near vision measuring unit 316 of the lens and the optical axis 0 do not match.) <Step 13> The sequencer 203 transmits the pulse driver circuit 200 to the X axis. The motor 12M is operated to sequentially move the lens to the nose side and the ear side, and the refractive characteristic values S (spherical power) and C (cylindrical power) of the moving lens are calculated from the processing unit 207 by the arithmetic circuit 209.
To enter. The processing unit 207 sets the reference distance spherical power MS and the reference distance cylindrical power MC to the near addition ADD from the near-distance refraction characteristic measurement values S and C which are momentarily. And input to the comparison circuit 206. The comparison circuit 206 determines the moving position of the lens having the maximum value ADD _M , K ₁ (x _K1 , y _K1 ), from the ADD value input momentarily from the processing unit 207, and outputs the position information to the sequencer 203. To do. At the same time, the maximum near addition power ADD _M is stored in the RAM 211.
The sequencer 203 operates the X-axis motor 12M and the Y-axis motor 11M based on the position information K ₁ (x _K1 , y _K1 ) to move the lens to the position K ₁ (x _K1 , y _K1 ).

<Step 14> The arithmetic circuit 209 reads the maximum near addition diopter ADD _M stored in the RAM 211 and the constant stored in advance in the ROM 212, and sets the cylinder diopter boundary value C _e to, for example, And store this value in the RAM 211.

<Step 15> As shown in FIG.
Specified position for distance part input in (ROM212 when there is no input)
The coordinates of a predetermined position E ₀ stored in the RAM 211 or the ROM 212 are read out, and the X-axis motor 12
Drives the M and Y axis motors 11M, and the measurement point is the designated distance position E ₀
Try to be on top.

In FIG. 5, the designated position of the distance measuring unit is not set in step 2 or 5, or the designated value A is wrong, and the original distance measuring unit 313 of the marked lens is different from the designated position E _0. FIG.

<Step 16> 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 in synchronization with each other to move the measurement point toward the nose side in the direction of 45 °. To move. The measured cylindrical power C at each measurement point during lens movement is input from the processing unit 207 to the arithmetic circuit 209. The arithmetic circuit 209 reads the reference distance cylinder power MC determined in step 10 stored in the RAM 211, subtracts the reference distance cylinder power MC from the measured cylinder power C, and compares the value (C-MC). Input to circuit 206.

The comparison circuit 206 compares and determines whether (C-MC) and the cylindrical frequency boundary value C _e stored in the RAM 211 satisfy C-MC> C _e. If so, the fact is input to the sequencer 203.

The sequencer 203 continued driving the X-axis motor 12M and the Y-axis motor 11M until the "satisfaction" command from the comparison circuit 206 was received, and continued to move the lens. Comparing the "satisfaction" command 20
The sequencer 203 received from 6 stops the motors 12M and 11M, but shifts 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 them to reverse the movement route of the previous step 16.

The processing unit 207 inputs to the arithmetic circuit 209 the measured cylindrical power C at each measurement point during lens movement. The arithmetic circuit 209 calculates (C-MC) and inputs the value to the comparison circuit 206.

The comparison circuit 206 determines the cylinder frequency boundary value C stored in the RAM 211.
_{Between e} and the calculated value (C-MC), it is determined whether or not C-MC ≦ C _e.
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 11M, stops the movement of the lens, and also operates the mark movement motor 30M and the driver circuit 202 to perform the conditional expression. Mark on the measurement point E _{1 at} which At the same time, 1 is stored in the storage address of the marking point number R of the RAM 211.

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

<Step 19> Next, the sequencer 203 drives the X-axis motor 12M, moves the lens so as to move the measurement point to the nose side, and obtains the measurement point that satisfies the above conditional expression.

<Step 20> The sequencer 203, which receives the command from the comparison circuit to satisfy the conditional expression, reverses the X-axis motor 12M and moves the measurement point to the ear side. If a command to satisfy the conditional expression is received from the comparison circuit 206 during the movement of this measurement point, the sequencer 203
Stops the X-axis motor 12M and measures point E that satisfies the conditional expression
Mark _n (here, n = 2). At the same time RAM211
The number of marking points R is updated by one.

(Here, R = 2) <Step 21> The sequencer 203 checks whether or not the number R of marking points stored in the RAM 211 is “6”. Repeated until the step 18 to 20 Shirushiten number R becomes R = 6 when less than "6", as shown in FIG. 5, to no Shirushiten E ₁ nasally
Get E ₆ . When the number R of markings is “6”, the process proceeds to the next step 22.

<Step 22> Move the lens X to return the measurement point to the designated distance position E _0.
The axis motor 12M and the Y axis motor 11M are driven and moved.

<Step 23> The same steps as those in Steps 16 to 21 described above are executed, and the measurement point E ₁ ′ that satisfies the conditional expression as shown in FIG.
Mark the missing E ₆ ′. However, in this step
The difference is that the “nasal side” of 16 is changed to “ear side”, the “nasal side” of step 19 is changed to “ear side”, and the “nasal side” of step 20 is changed to “ear side”.

As a result of the above execution of the marking point SUB routine, as shown in FIG. 6, a marking point is made on the cylinder power boundary value C _e line or slightly inside thereof. For example, when the maximum addition power is 1.50D, the cylinder power boundary value C _e is 0.50D from the equation (b). In the lens with the distance refraction characteristic of only spherical power MS, it is marked on the line C _e = 0.50D. If the reference distance cylindrical power MC is a lens of MC = 1.25D, C-1.25 ≦ 0.5D, and C = 1.75D is marked on the equal cylindrical power line.

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

<Step 2-1> The same steps as steps 1 to 17 in the above-described first embodiment are executed.

<Step 2-2> Based on the xy coordinate values of the mark point position E ₁ (X _E1 , X _yE1 ), X≡x _E1 , Y≡y _E1 , and S≡θ ₁ are determined.

<Step 2-3> In order to determine a new measurement point, the x coordinate and the y coordinate of the measurement point E _i (x _i , y _i ) are set. And put. It should be noted that here, γ is a constant that is arbitrarily obtained and is previously stored in the ROM 212 as a constant, as shown in FIG. Further, θ _{1 is} also stored in the ROM 212 in advance at an angle that can be arbitrarily determined. For example, θ ₁ is obtained as 210 °. The arithmetic circuit 209 reads γ and θ ₁ from the ROM 212, reads the coordinate value of the mark point position E ₁ (x _E1 , y _E1 ) from the RAM 211, and based on the above equation (c), a new measurement point E _i ( x _i , y _i ),
This coordinate data is input to the sequencer 203.

<Step 2-4> The sequencer 203 receives the measurement point coordinate value E from the arithmetic circuit 209.
_{Based on i} (x _Ei , y _Ei ), x-axis motor 12M and y-axis motor 1
The lens is moved to drive 1M and move the measurement point on the optical axis 0.

<Step 2-5> The cylinder frequency C is measured at the measurement point E _i (x _i , y _i ) and the arithmetic circuit 2
After calculating (C-MC) in 09, the comparison circuit 206 determines whether or not the conditional expression is satisfied. When the conditional expression is "satisfied", the process proceeds to step 2-7, and when it is not "satisfied", the process proceeds to step 2-6.

<Step 2-6> Since the comparison circuit 206 determined in the previous step 2-5 that the conditional expression is not satisfied at the measurement point E _i , the angle S determined in step 2-2 is S + Δθ (Δθ is an arbitrary unit) The angle is stored in advance in the ROM 212), and at step 2-3, new measurement point E _i (x _Ei , y _Ei ) is used with the above equation (c), x _i = X + γ cos (S + Δθ) y _i = X + γ cos It is calculated as (S + Δθ), and then steps 2-4 and 2-5 and this step are repeated until the conditional expression is satisfied. That is, until the conditional expression is satisfied, the measurement point E _i is as shown in FIG.
It moves on a circular arc of radius γ centering on the mark point position E ₁ .

<Step 2-7> In the previous step 2-5, the comparison circuit 206 marks the measurement point E _i determined to satisfy the conditional expression. Mark point position is E _R.

<Step 2-8> x coordinate of the marking point position E _R marked in the previous step 2-7
Based on x _ER and y coordinate _ER , X in step 2-2 is set to x _ER ,
Replace Y with y _ER .

<Step 2-9> R set to R = 1 in step 17 is replaced with R + 1. That is, R becomes R + 1 = 1 + 1 = 2. With this
The marking point count R of the RAM 211 is replaced with 2.

<Step 2-10> The sequencer 203 determines whether or not the marking point number R of the RAM 211 is “6”, and when it is “6”, the sequence proceeds to the next step 2-11,
In the case of "no", the above steps 2-3 to 2-9 are repeated until the marking point number R becomes "6".

<Step 2-11> The sequencer 203 drives the X-axis motor 12M and the Y-axis motor 11M to move the lens to return the measurement point to the designated distance position E ₀ .

<Step 2-12> The sequencer 203 supplies the same number of pulses to the X-axis motor 12M and the Y-axis motor 11M in synchronization with each other, and moves the lens toward the ear side so that the measurement point moves in the 45 ° direction.

The comparison circuit 206 is an arithmetic circuit 209 for each measurement point during lens movement.
C-MC value from and the cylinder frequency boundary value C _e stored in RAM211 are compared, it is determined whether or not the condition expression is satisfied, and the measurement point is set to the ear side 45 ° direction until it is satisfied. Move along.

<Step 2-13> When a measurement point satisfying the conditional expression is found, the sequencer 203 then reverses the X-axis motor 12M and the Y-axis motor 11M at the same time, and reverses the measurement point movement route in the previous step 2-12. The measurement point is moved in the direction, and the comparison circuit 206 marks the measurement point E ₁ ′ determined to satisfy the conditional expression. At the same time, the coordinate value of the marking point position E ₁ ′ (x _E1 ′, y _E1 ′) is stored in the RAM 211, and the marking point number R is set to 1 and stored in the RAM 211.

<Step 2-14> As in the case of Step 2-2 described above, the marking point position E ₁ ′
Based on (x _E1 ′, y _E1 ′), X≡x _E1 ′, Y≡y _E1 ′, and S≡θ ₂ are determined. Here, θ ₂ is an arbitrary constant set in advance and is stored in the ROM 211 in advance. In the example of FIG. 8, θ ₂ is set to 30 °.

<Step 2-15> To Shirushiten in E _R 'performs the same operation as steps 2-3 through 2-10 above.

In each of the first and second embodiments described above, both the distance portion and the supply portion of the lens are marked, but the present invention is not necessarily limited to this, and the distance portion may be used as necessary. You may make it mark only on a part or only a near part.

Further, in each of the above-mentioned embodiments, the measurement point is marked on each measurement point that satisfies the conditional expression, but instead, all the measurement points that satisfy the conditional expression are stored in RAM in advance, and then the marking point is set. The operation may be continuously executed based on the stored measurement point data.

Also, the mark position does not necessarily have to be on the measurement point,
It is also possible to mark a point extending from the measurement point to a predetermined distance as long as it is within the area that satisfies the conditional expression. This means that in order to prevent the marking point mark from being erased by the lens holding pin 25 during lens movement, the coordinate relationship between the marking point position and the lens holding pin 25 is calculated for each lens movement and measured one after another. This is effective when determining the point, that is, the mark position.

〔The invention's effect〕

According to the present invention, the distribution area of the cylindrical power can be easily known. For this reason, if a mark is made on the equi-cylindrical power line so as to indicate this region, the wearing position when wearing the spectacles,
There is an effect that it is possible to easily determine whether or not it is in a predetermined distribution area.

[Brief description of drawings]

FIG. 1 is a perspective view showing a mechanical configuration diagram of a lens marking device of the present invention, FIG. 2 is a block diagram showing a circuit configuration of an electric control system of the lens marking device, and FIG. 3 is a lens marking device. 4 is a flowchart showing an operation routine, FIGS. 4 (A) and 4 (B) are flowcharts showing the first embodiment of the marking point subroutine of the flowchart of FIG. 3, and FIG. 5 is a lens according to the first embodiment. 6 is a schematic diagram showing the position of the marking point together with the movement route of the measurement point, FIG. 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 that of FIG. FIG. 8 is a flow chart showing a second embodiment of the marking point subroutine of the flowchart, and 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 marking of an unprocessed progressive multifocal lens, and FIG. 10 is a schematic diagram showing the relationship between the designated distance position and the designated near position. 1 ... Measurement optical system and detector, 11 ... Y-axis feed mechanism, 12 ... X-axis feed mechanism, 14,15 ... Hand, 20 ... Lens holder, 203 ... Sequencer, 206 ... Comparison circuit , 209 ... Arithmetic circuit, 211 ... RAM, 212 ... ROM.

Claims (2)

[Claims] 1. A lens meter capable of measuring optical characteristics of a progressive multifocal lens having a distance portion and a near portion, and a storage unit for storing a reference cylindrical power of the distance portion, To have a computing unit for computing the difference between the reference cylindrical power of the distance portion and the measured cylindrical power, and to detect the distribution state of the refractive characteristics of the progressive multifocal lens based on the output of the computing unit. A lens meter characterized by being configured as. 2. The lens meter according to claim 1, further comprising a marking point portion marked on the equi-cylindrical power line by the output of the calculating portion.