JP2000205853A - Device for measuring lens for spectacles and its probe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent base-material lenses from being deformed and to enable accurate measurement by providing both a device for measuring the thickness of the edge of a lens and a device for measuring the diameter of a spectacles lens, and performing diameter measurement by the lens diameter measuring device prior to the measurement of the thickness of the thinnest edge by the edge thickness measuring device. SOLUTION: A device 28A for measuring the thickness of the edge of a lens of spectacles and a device 28A for measuring the diameter of a lens are both provided and constituted so as to measure the thickness of the edge of a lens during the measurement of the diameter of the same lens. Diameter measurement by the lens diameter measuring device 28B is performed prior to the measurement of the thickness of the edge by the edge thickness measuring device 28A. Then a measured value of diameter at any location of measurement by the lens diameter measuring device 28B and a radius vector length at a location corresponding to the location of measurement among measurement information around the optical center of the frame of the spectacles lens are compared with those prior to the measurement of the thickness of the edge at any location after diameter measurement at any location, and a probe 52 is separated from a lens W when the former measured value of diameter is smaller than the latter radius vector length.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spectacle lens measuring apparatus for measuring a lens in relation to shape measurement information of a spectacle lens frame.

[0002]

2. Description of the Related Art A lens edge thickness measuring device for measuring the edge thickness of a cloth lens at a position corresponding to the information based on shape measurement information (radial radius and angle) of a spectacle lens frame is disclosed in, for example, No. 9-117849 exists. The measurement device of the same type is a measurement made up of a pair of rigid bodies that come into contact with the same radial position on the front and rear surfaces of the dough lens fixed to the lens rotation axis of the eyeglass lens processing machine from the edge thickness direction. And a rack and pinion mechanism for converting the displacement of the measuring element in the edge thickness direction into a rotational displacement of the pinion, and a rotary encoder to which the rotational displacement of the pinion is input.

In the measurement of the edge thickness, the rotation axis of the lens is rotated by the operation of the spectacle lens processing machine and is displaced in the radial direction of the fabric lens based on the shape measurement information. The tracing stylus will be moved on a trajectory corresponding to the spectacle lens frame, during this movement, one tracing stylus is pressed against the front surface of the fabric lens,
The other probe will be pressed against the back surface,
The relative displacement of the tracing stylus is detected by a rotary encoder via a rack and pinion mechanism, and the edge thickness is specified from this detection information.

By the way, the shape and size of the eyeglass lens frame,
Depending on the optical center position of the spectacle lens frame and the outer diameter of the dough lens, the trajectory corresponding to the spectacle lens frame in the dough lens may deviate from the outer diameter of the dough lens. they said. When the edge thickness of the fabric lens is measured by a conventional edge thickness measuring device under the conditions where such a material breakage phenomenon occurs, the pair of tracing stylus deviates from the outer diameter of the lens during the measurement. At this time, the edge thickness information value detected by the rotary encoder measures a position where the fabric lens does not exist, and becomes smaller at a stroke.

The occurrence of the sudden change in the information value makes it possible to determine that the stylus comes off, and immediately moves the stylus away from the fabric lens to stop the edge thickness measurement. The means already exist.

[0006]

In the above-mentioned conventional edge thickness measuring apparatus, even if the material-out checking means is provided, if the measuring element comes off from the cloth lens during the measurement of the edge thickness, the measuring element and the measuring element are disconnected. It is a first object of the present invention to provide a spectacle lens measuring device capable of coping with the problem that the fabric lens may be caught and damaged.

Further, the conventional edge thickness measuring apparatus has the following various problems, and the present invention is intended to solve these problems. That is, in order to accurately measure the edge thickness, it is necessary to press a measuring element made of a rigid body against the fabric lens with an appropriate contact pressure, but the contact pressure at this time deforms the thin fabric lens, The accurate measurement may not be performed, and such a phenomenon is particularly remarkable in a thin convex lens, and the measuring element may damage the surface of the fabric lens due to a relatively large contact pressure. .

Further, since the displacement of the tracing stylus is transmitted to the rotary encoder via the rack and pinion mechanism, the backlash of the gear portion of the rack and pinion mechanism may impair the accuracy of the measurement information. If sufficient measures are taken to eliminate the backlash, smooth operation will be sacrificed. Further, when the probe made of a rigid body is rapidly displaced on the fabric lens due to abnormal operation of the control system, the lens surface may be damaged.

[0009]

In order to achieve the above object, a spectacle lens measuring apparatus according to the present invention includes a lens edge thickness measuring apparatus and a spectacle lens diameter measuring apparatus.
Then, during the measurement of the lens diameter by the lens diameter measuring device,
The edge thickness of the same lens is measured by the lens edge thickness measuring device, and the diameter measurement by the lens diameter measuring device is performed prior to the edge thickness measurement by the lens edge thickness measuring device. Further, the measured value of the arbitrary measurement position by the lens diameter measuring device and the moving radius length of the position corresponding to the arbitrary measurement position in the measurement information around the optical center of the spectacle lens frame are compared with the lens cover after the diameter measurement of the arbitrary position. When the former measured value is smaller than the latter radial length as compared with the one before the edge thickness measurement at the arbitrary position by the thickness measuring device, a cut-out material checking means for separating the measuring element from the lens is incorporated.

With this configuration, the measuring element of the lens edge thickness measuring device comes off the outer periphery of the lens in a state of being pressed against the lens, or the measuring element detached in this way interferes with the outer periphery of the lens. That will not happen.

The eyeglass lens measuring apparatus according to the present invention is preferably as follows. That is, a strain gauge and a stepping motor are provided, and the edge thickness or the lens diameter of the lens is measured by cooperation of the strain gauge and the stepping motor. Further, a tracing stylus having an elastic body is provided, and a strain gauge for measuring a strain of the elastic body is fixed to the elastic body. Further, the measuring element of the spectacle lens measuring device has a parallelogram structure, and a pair of side members facing each other in a specific direction is formed of an elastic body, and the strain of the elastic body is reduced by a strain gauge fixed to the elastic body. Shall be measured.

In this case, the elastic body prevents generation of an excessive contact pressure between the fabric lens and the tracing stylus,
This prevents deformation of the fabric lens, and ensures accurate measurement, and does not damage the surface of the fabric lens even if the tracing stylus is suddenly displaced. Further, means for transmitting the displacement of the tracing stylus by means of a gear in the measurement of the fabric lens is not required, and therefore, the backlash of the gear does not impair the measurement accuracy.

[0013]

FIG. 1 is a side view showing a spectacle lens processing machine provided with a spectacle lens measuring apparatus according to the present invention.
FIG. 2 is an explanatory plan view of the eyeglass lens processing machine. In these figures, reference numeral 1 denotes a box-shaped casing having four surroundings, and reference numeral 2 denotes a lid which covers the upper opening of the box-shaped casing 1 so as to be able to swing up and down around a hinge 3.

4 is a box-shaped casing 1 and a lid 2
The bottom surface 5 of the space 4 is formed inside the upper part of the box-shaped casing 1. This bottom surface 5 has a relatively lower front bottom surface portion 5a and a rear bottom surface portion 5b higher than the bottom surface portion 5a by one step.
In addition to the above, a measurement opening 6 having a rectangular shape as viewed from the front is formed at a part of a connecting portion between the front bottom surface 5a and the rear bottom surface 5b, and the opening 6 is obliquely covered from the upper front side. The configuration is such that the measurement lid 5c is provided so as to be able to open to the virtual line position k1.

Reference numeral 7 denotes a bearing fixed to the upper surface of the rear bottom portion 5b. The bearing 7 has a support sliding shaft 8 which is slidable in the left-right direction f1 and rotatable within a certain range. Has been inserted. Reference numeral 9 denotes a generally rectangular swing base in plan view, disposed in front of the support sliding shaft 8, having projecting portions 9a, 9b on the front left and right, and arm portions 9c, 9 on the rear left and right.
c. The left and right arms 9c, 9c are fixed to the supporting slide shaft 8, and the left and right overhangs 9a, 9b are provided with lens rotating shafts 10a, 10b, which can be rotationally driven by a stepping motor 11 fixed inside the swing table 9. It is installed in.

Reference numeral 12 denotes a chucking mechanism provided at the outer end of the right lens rotating shaft 10b. The chucking mechanism 12 transmits the rotation of a motor (not shown) to move the lens rotating shaft 10b with an appropriate force. It is made to move right and left.

Reference numeral 13 denotes transverse feed means disposed near the left side of the support sliding shaft 8. The transverse feed means 13 has a screw shaft 15 as an output shaft of a stepping motor 14 fixed to the rear bottom surface 5b. At the same time, the front end of the screw shaft 15 is rotatably supported by a bearing member 16 fixed to the rear bottom surface portion 5b, and the connecting member 18 is extended from a nut body 17 screwed to the screw shaft 15. The tip of the coupling member 18 is connected to the left end of the support sliding shaft 8 in a state where only the rotation of the support sliding shaft 8 is allowed. When the stepping motor 14 rotates, the screw shaft 15 rotates, and in conjunction with this rotation, the screw shaft 15 rotates. The nut body 17 is screw-fed in the left-right direction, and this screw-fed causes the swing table 9 to be laterally fed via the coupling member 18 and the support sliding shaft 8.

Reference numeral 19 denotes a lens diameter feeding means disposed below the right front portion of the swing table 9 and is constructed as follows. That is, a diameter-feeding arm member 20 is provided at the right end of the support sliding shaft 8 so as to be freely rotatable only.
Numeral 0 is supported at a fixed height by a support means (not shown), and is movable in the left-right direction f1. A stepping motor 21 is fixed to the arm member 20 in a vertical direction, and a vertical diameter feed rod 2 is provided at a position forward of the motor 21.
2 is installed so that it can be displaced up and down.
1 output shaft and the vertical diameter feed rod 22 are connected to the diameter feed screw means 23.
And a support roller 24 projecting from the front end of the swing table 9 at the end of the vertical diameter feed rod 22.
The contact member 25 that supports the peripheral surface of the contact member 25 is fixed.

In the lens diameter feed means 19, even if the swing table 9 is located at an arbitrary position in the left-right direction f1, the rotation of the stepping motor 21 causes the diameter feed screw means 23 to move the vertical diameter feed rod. 22 is displaced in the vertical direction, and this displacement causes the swing table 9 to swing up and down around the support sliding shaft 8 via the contact member 25 and the supported roller 24, whereby the lens rotating shafts 10 a and 10 b
Is moved in the direction of the specific diameter.

Reference numeral 26 denotes a left-right grindstone shaft rotated by a motor (not shown), which is rotated at an appropriate height on the bottom surface 5. The grinding wheel shaft 26 has a cylindrical grinding wheel 2.
7 is fixed. A spectacle lens measuring device 28 is arranged in a slanting manner slightly below the rear bottom surface of the grinding stone 27 and directly behind the measuring lid 5c.
Below this, a moving device 29 for moving this obliquely upward and forward is disposed in the same inclined shape.

First, the spectacle lens measuring device 28 will be described with reference to FIGS. 3, 4 and 5. here,
3 and 4 are a plan view and a side view showing the measuring device 28, and FIG. 5 is a side view showing a part of the measuring device 28. An eyeglass lens diameter measuring device 28B is provided on the upper surface of the substrate 30 in addition to the lens edge thickness measuring device 28A.

The lens edge thickness measuring device 28A is as follows. That is, the base ends of a pair of support plates 32, 32 projecting forward f2 on the upper surfaces of the left and right ends of the bearing support main member 31 fixed to the upper surface of the substrate 30 are fixed by bolts. Stepping motors 33A and 33B are bolted vertically to the front of the motor.

The output shaft of each of the stepping motors 33A, 33B is projected above the support plates 32, 32, and an arm member 35 is bolted to the tip of each output shaft via a coupling member 34. Yes, and each arm member 35
A tracing stylus 36 is extended from the tip of. Each measuring element 3
Reference numeral 6 denotes an elastic body 37 made of a metal plate capable of elastic deformation in the left-right direction f1, and a contact member 38 made of a rigid sphere fixed to one surface of the distal end of the elastic body 37. At this time, the contact members 38 of the left and right tracing styluses 36, 36,
38 are positioned so as to face each other. Further, each probe 36
A strain gauge 39 is attached and fixed to the outer surface of the elastic body 37.

An optical origin confirmation sensor 40 is fixed on the upper surface of the support plate 32 behind the coupling member 34 fixed to the output shafts of the stepping motors 33A and 33B. Each sensor 40 detects that the detected piece 41 projecting from the rear of the coupling member 34 has reached a specific position, and the contact member 38 moves to a position corresponding to the origin S1 or S2 on the corresponding left-right coordinate axis. It is made to confirm that it is located in. At this time, each of the stepping motors 33A and 33B is independently operated to rotate.
Is located at a position corresponding to the origin S1 or S2, the distance between the contact members S1 and S2 is determined to be larger than the total thickness of the fabric lens w in the left-right direction.

The lens diameter measuring device 28B is as follows. That is, the base of the front and rear screw shaft 44 is supported at the center part of the bearing support main member 31 in the left-right direction via the bearing holder 42 and the bearing 43 so as to be rotatable only at a fixed position. At this time, the front end of the screw shaft 44 is rotatably supported by a front bearing support member 45 fixed to the substrate 30 via a bearing 46, while the rear end of the screw shaft 44 is fixed to the upper surface of the substrate 30 behind the bearing support member 31. The output shaft of the stepping motor 47 is connected via a connecting member 48.

Directly above the screw shaft 44, a sliding shaft 4 facing forward and backward is provided.
The sliding shaft 49 has a front portion formed in a shaft support hole 45a formed in the upper portion of the front bearing support member 45, and a rear portion formed in a shaft support hole formed in the upper portion of the main bearing support member 31. 31a is slidably inserted through 31a and the circumferential displacement is regulated by appropriate means. A coupling member 50 is fixed to the sliding shaft 49, and a nut body 51 screwed to the screw shaft 44 is fixed to a lower portion of the coupling member 50.

A tracing stylus 52 is fixed to the tip of the sliding shaft 49. The tracing stylus 52 is connected to a pair of side members 53a, 53b opposed in the front-rear direction and a pair of side members 54a, 54b opposed in the vertical direction. And a parallelogram structure consisting of And a pair of side members 53a opposed in the front-back direction,
Each of 53b is formed of an elastic body made of a metal plate capable of being elastically deformed in the front-rear direction, and an upper side member 54a of a pair of side members 54a, 54b opposed in the vertical direction is a contact member. A rigid plate having a semicircular end and a horizontal orientation is formed on the left and right sides. On the other hand, the lower side member 54b is formed by a part of an annular rigid body externally fitted and fixed to the end of the sliding shaft 49. It is. At this time, the contact member 54a is higher than the vertical position of the previous contact member 38, and the strain gauge 55 is attached and fixed to the front surface of the elastic body forming the front side member 53a.

An optical origin confirmation sensor 56 is fixed to the upper surface on the right side of the bearing support main member 31. This sensor 56 is a detection piece 57 provided on the upper end surface of the coupling member 50.
Has reached a specific position, and confirms that the contact member 54a is located at a position corresponding to the origin S3 on the front-rearward coordinate axis.

Next, the moving device 29 will be described with reference to FIGS. A drive unit 58 and a driven unit 59 driven by the drive unit 58 are provided. The drive unit 58 is a motor support 60 fixed to the box-shaped casing 1 in an inclined manner.
And a motor 61 fixed to the support 60 and a pinion 63 connected to an output shaft 62 of the motor 61. The driven portion 59 is moved forward and backward by a female guide 64 of the motor support 60. It comprises a guided plate 65 inserted so as to be freely slidable in the direction, and a rack member 66 fixed to the guided plate 65 and engaged with the pinion 63. At this time, the substrate 30 of the spectacle lens measuring device 28 is fixed to the upper surface of the guided plate 65, and the guided plate 65 located at the storage position as shown in FIG. A stopper 67 for locking the rear end is provided.

The moving device 29 and the measuring lid 5c are linked, and the operation thereof is performed as follows. That is, when the motor 61 is rotated in a specific direction, the guided plate 65 and the spectacle lens measuring device 28 are moved forward f2 via the pinion 63 and the rack member 66, and the measuring lid 5c is connected with the solid line in connection with this. Is swung from the position indicated by to the imaginary line position k1 to the open position, and then the tracing styluses 36, 36, and 52 are moved forward f2 through the opening 6 and
In this state, when the motor 61 is rotated in the opposite direction to the specific direction, the guided plate 65 and the eyeglass lens are measured in the opposite direction. The device 28 is moved backward and the probe 3
After the 6, 6, 52 are retracted behind the opening 6, the measuring lid 5
As shown in FIG. 1, the guided plate 65 returns to a state in which it is locked by the stopper 67 as shown in FIG.

FIG. 6 shows a control system of the spectacle lens measuring device 28. As shown in FIG. 6, the output signals of the respective strain gauges 39, 39 and 55 are amplified by an amplifier 68.
The amplified output signal is converted from analog to digital by an AD converter 69 and transmitted to a central processing unit CPU of a control computer. The central processing unit CPU includes a driver 70 corresponding to each of the strain gauges 39, 39, 55. And the driver 70 rotates the stepping motors 33A, 33B and 47 in accordance with the number of pulses. At this time, RAM and RO
M is a storage unit for storing information necessary for the processing of the central processing unit CPU. The information stored in the storage unit includes, for example, a control program for each of the stepping motors 33A, 33B, 47, and a check for running out of cloth. And other programs.

Next, a description will be given of a processing example in the case of measuring the cloth lens w using the spectacle lens measuring device 28 in the above-mentioned spectacle lens processing machine. By operating the chucking mechanism 12 in a state where the optical center of the cloth lens w to be measured and the centers of the lens rotation axes 10a and 10b are matched, the cloth lens w is made into a lens as shown in FIGS. The rotating shafts 10a and 10b are gripped.

Further, primitive measurement information (consisting of the radial length and the radial angle at each measurement point) obtained by measuring the spectacle frame with an existing measuring device is input from an input device (not shown). The input primitive measurement information is stored in the central processing unit CPU.
The normal measurement information (ρi, θi) (i = 1,
2,..., N), and the corrected result is stored in the storage unit RAM. Here, ρi is a radial length and a radial angle corresponding to the number i around the optical center, and i
Is a number indicating the order of the measurement points.

After this state, when the eyeglass lens processing machine is started, the following operation is automatically performed by computer control. That is, the stepping motor 21 of the diameter feeding means 19 and the stepping motor 1 of the
4 operates to appropriately move the swing table 9 in the initial position shown in FIGS. 1 and 2 around the sliding support shaft 8 and in the left-right direction,
The cloth lens w is positioned at a specific height position in front of the spectacle lens measuring device 28. Further, the stepping motor 11 for lens rotation feed is operated to rotate the fabric lens, and the rotation angle position is positioned at a specific position.

Thereafter, the moving device 29 is actuated to move the entire eyeglass lens measuring device 28 in the stowed position by a predetermined distance forward f2 as shown in FIG. The children 36, 36 are positioned at specific left and right positions on the front and rear surfaces of the fabric lens w as shown in FIG.

Next, a stepping motor 3 for measuring the edge thickness
3A and 33B are activated, and the origin S is set as shown by the solid line in FIG.
1, the contact members 38, 38 of the right and left tracing styluses 36, 36 for measuring the edge thickness at the positions corresponding to S2 are pressed against the front and rear surfaces of the fabric lens w as shown by a virtual line k2, and FIG. As shown in FIG. 5, the contact member 54a of the measuring element 52 for measuring the lens diameter at the position corresponding to the origin S3 is pressed against the peripheral surface of the fabric lens w as shown in FIG. As a result, the elastic bodies 39, 39 of the left and right tracing styluses 36, 36 are bent in the left-right direction, and the elastic bodies 53a, 53b of the tracing stylus 52 are bent in the front-rear direction. At this time, the contact members 38, 38 of the left and right tracing styluses 36, 36 are at the measurement start position (ρ
1, θ1), and a contact member 54a of the tracing stylus 52
In the example shown in FIG. 4, abuts on the radial angle position ahead of the radial angle θ1 by 90 degrees.

Each of the stepping motors 33A, 33B, 4
When the operation of the motor 7 is started, the rotation of the output shaft of each motor is controlled by a computer so that the contact pressure between the contact member 38 or 54a and the fabric lens w becomes constant. The measured values of the edge thickness and the lens diameter are calculated based on the number of pulses corresponding to the rotation amount of the output shaft of each motor, and the measured values are stored in the storage unit RAM.

FIG. 7 shows a flow of processing until the measured values of the edge thickness and the lens diameter are calculated and stored in the storage unit RAM. First, the measurement of the lens diameter will be described with reference to FIG.

In step S100, the strain gauge 5
5 measures the strain of the elastic body 53a. This measurement output is amplified by the amplifier 68, and subsequently converted into a digital measurement value by the AD converter 69, and then input to the central processing unit CPU.

In step S101, the central processing unit CPU determines whether or not the input measured value of the strain gauge 55 is equal to a preset gauge reference value. If the result is YES, the process proceeds to step s102, where the absolute coordinate value L1 on the longitudinal coordinate axis of the contact member 54a is set.
(See FIG. 5). The absolute coordinate value L1 is determined by the number of pulses supplied by the central processing unit CPU to the driver 70 in order to obtain the rotation amount of the stepping motor 47 required to move the contact member 54a from the origin S3 to the current position, It is calculated based on the rotation direction of the stepping motor 47.

Next, the process proceeds to step S103, where the lens diameter R1 at the position where the moving radius angle at the measurement start position is [θ1 + 90] degrees is calculated and stored in the storage unit RAM. This lens diameter R1 is calculated by the following equation (1). R1 = LA−L1 (1) Here, LA is a distance from the position of the origin S3 to the optical center of the cloth lens w and is specified in advance.

On the other hand, if the result of step S100 is NO, the process proceeds to step s104, where the strain gauge 5
It is determined whether or not the measured value of 5 is larger than the gauge reference value. If the result is YES, step s105
Then, the output shaft of the stepping motor 47 is rotated by a very small amount in a direction in which the strain measured by the strain gauge 55 decreases. Then, the process returns to step s100 again. This step s100, S101, s10
Steps 4, s105, and S100 are repeated until the measured value of the strain gauge 55 and the gauge reference value become equal, and after becoming equal, the process proceeds to step s101 and subsequent steps.

On the other hand, if the result of step S104 is NO, the process proceeds to step s106, where the output shaft of the stepping motor 47 is rotated by a small amount in a direction in which the strain measured by the strain gauge 55 increases. Then, the process returns to step s100 again.
The flow of 100, S101, s104, s106, and S100 is repeated until the measured value of the strain gauge 55 and the gauge reference value become equal.
Proceed to 101 and subsequent steps. With such a flow, the lens diameter R
The measurement of 1 (corresponding to i = 1) ends.

Next, measurement of the edge thickness will be described. In step S100, each of the left and right strain gauges 39, 39 measures the strain of each elastic body 37. This measurement output is amplified by the amplifier 68, and subsequently converted into a digital measurement value by the AD converter 69, and then input to the central processing unit CPU.

In step S101, the central processing unit CPU determines whether or not the input measured values of the strain gauges 39, 39 are equal to a preset gauge reference value. If the result is YES, the process proceeds to step s102, where the absolute coordinate value L2 on the left-right coordinate axis of the contact member 38 for each of the stepping motors 33A and 33B,
L3 (see FIG. 3) is calculated. These absolute coordinate values L2, L
3 is the number of pulses supplied by the central processing unit CPU to the driver 70 in order to obtain the amount of rotation of the stepping motor 33A or 33B required to move the contact member 38 from the origins S1 and S2 to the current position; It is calculated based on the rotation direction of the stepping motor 33A or 33B.

Next, the process proceeds to step S103, where the edge thickness T1 at the position where the radial angle at the measurement start position is [θ1] degrees is calculated, and this is stored in the storage unit RAM. This edge thickness T1
Is calculated by the following equation (2). T1 = LB-L2-L3 (2) Here, LB is the distance between the origins S1 and S2, and is specified in advance.

On the other hand, if the result of step S100 is NO, the process proceeds to step s104, where the strain gauge 3
It is determined whether or not the measured value of No. 9 is larger than the gauge reference value. If the result is YES, step s105
The output shaft of the stepping motor 33A or 33B is rotated by a small amount in a direction in which the strain measured by the strain gauge 39 is reduced. And again, step s
100, and the steps s100, S10
The flow of steps 1, s104, s105, and S100 is repeated until the measured value of the strain gauge 39 becomes equal to the gauge reference value, and after becoming equal, proceeds to step s101 and subsequent steps.

On the other hand, if the result of step S104 is NO, the process proceeds to step s106, where the output shafts of the stepping motors 33A and 33B are rotated by a small amount in a direction in which the strain measured by the strain gauge 39 increases. .
Then, the process returns to step s100 again. This step s100, S101, s104, s106, S1
The flow of 00 is repeated until the measured value of the strain gauge 39 becomes equal to the gauge reference value, and after it becomes equal, the process proceeds to step s101 and thereafter. With such a flow, the measurement of the edge thickness T1 (corresponding to i = 1) ends.

Next, the stepping motor 11 and the stepping motor 21 determine the regular measurement information (ρi, θi) (i
= 1, 2,..., N), the contact members 38, 3
8, 54a are the next measurement positions (ρ2, θ) of the fabric lens w
It is moved to the position corresponding to 2). Then, also here, the lens diameter R2 and the edge thickness T2 at the position corresponding to the measurement position (ρ2, θ2) are calculated by the flow shown in FIG.
These measurement information (R2, T2) is stored in the storage unit RAM.

Such processing is performed at each measurement position (ρ
i, θi), whereby the regular measurement information (ρi, θi) (i = 1,
The lens diameter Ri and the edge thickness Ti are calculated for all the measurement positions corresponding to 2,...
In M, these measurement information (ρi, θi, Ri, Ti) (i
= 1, 2,..., N) are stored.

By the way, depending on the relationship between the regular measurement information (ρi, θi) (i = 1, 2,..., N) of the spectacle frame and the diameter of the cloth lens w, the measurement position may be different from that of the cloth lens w.
May be more outward than the outer circumference. To prevent this, during the above measurement, the central processing unit CPU transmits the lens diameter Ri at the specific measurement position measured by the lens diameter measurement device 28B and the regular measurement information (ρi, θi) of the spectacle lens frame.
Of (i = 1, 2,..., N), the moving radius length ρi of the specific measurement position is compared immediately after the measurement of the lens diameter Ri of the specific measurement point.

When the measurement lens diameter Ri at the specific measurement position is smaller than the moving radius length ρi at the specific measurement position, the contact members 38 of the left and right tracing styluses 36 correspond to the measurement lens diameter Ri. Before reaching the moving radial angle θi, the stepping motors 47, 33A, 33B operate, and the respective measuring elements 36, 36, 52 of the lens diameter measuring device 28B and the lens edge thickness measuring device 28A are separated from the fabric lens w. To the positions corresponding to the origins S1, S2, S3, and the measurement by the spectacle lens measuring device 28 is stopped.

In the above embodiment, the spectacle lens measuring device 28 of the present invention is used for measuring the texture lens w. However, the present invention is not limited to this, and may be used in various modes.

[0054]

According to the present invention described above, since the lens edge thickness measuring device and the spectacle lens diameter measuring device are provided together,
It is possible to prevent the measuring element of the lens edge thickness measuring device from coming off the outer periphery of the lens in a state where the measuring element is pressed against the lens to be measured.Therefore, when the measuring element comes off the lens, the measuring device may be damaged or damaged. The spectacle lens can be prevented from being damaged.

According to the second aspect, the edge thickness of the same lens is measured by the lens edge thickness measuring device during the measurement of the lens diameter by the lens diameter measuring device.
The efficiency of the work of measuring the lens diameter and the edge thickness is improved, and the accuracy of checking for out-of-fabric is improved as compared with the case where these measurements are separately performed.

According to the third aspect, since the diameter measurement by the lens diameter measuring device is performed prior to the edge thickness measurement by the lens edge thickness measuring device, during the simultaneous measurement of the lens diameter and the edge thickness. In addition, it is possible to prevent the measuring element of the lens edge thickness measuring device from coming off the outer periphery of the lens to be measured with a margin.

According to the fourth aspect, the measured value of the arbitrary measuring position by the lens diameter measuring device and the radial length of the position corresponding to the arbitrary measuring position in the measurement information around the optical center of the spectacle lens frame are calculated by: When the former measured value is smaller than the latter radial length compared to after the diameter measurement at the arbitrary position and before the edge thickness measurement at the arbitrary position by the lens edge thickness measuring device, the measuring element is separated from the lens. Even if the measuring element of the lens edge thickness measuring device comes off the outer circumference of the lens to be measured,
It is possible to reliably prevent collision or snagging between the tracing stylus and the lens.

According to the fifth aspect, since the strain gauge and the stepping motor are provided, and the edge thickness or the lens diameter of the lens is measured by the cooperation of the strain gauge and the stepping motor, the strain gauge is independent of the gear backlash. Measurement can be performed and the contact pressure between the contact point and the lens can be reduced. Therefore, even if the lens is thin, deformation due to contact of the contact point does not occur, and high-precision measurement can be performed. It can prevent sticking.

According to the sixth aspect of the present invention, since the measuring element having the elastic body is provided, and the strain gauge for measuring the strain of the elastic element is fixed to the elastic body, the contact pressure between the measuring element and the lens can be reduced. Can be reduced by the elasticity of the elastic body, and can be measured independently of the screw gap by the elasticity of the elastic body.

According to claim 7, a pair of side members having a parallelogram structure and facing each other in a specific direction are formed of an elastic body, and the strain of the elastic body is measured by a strain gauge fixed to the elastic body. Therefore, even when the elastic body is bent by being pressed against the lens, the contact position between the tracing stylus and the lens does not greatly change, and the lens diameter and the like can be accurately measured.

[Brief description of the drawings]

FIG. 1 is a side view showing an eyeglass lens processing machine provided with an eyeglass lens measuring apparatus according to the apparatus of the present invention.

FIG. 2 is an explanatory plan view of the spectacle lens processing machine.

FIG. 3 is a plan view showing the measuring device.

FIG. 4 is a side view showing the measuring device.

FIG. 5 is a side view showing a part of the measuring device.

FIG. 6 is a diagram showing a control system of the spectacle lens measuring device.

FIG. 7 is a diagram showing a flow of processing from calculating a measured value of an edge thickness or a lens diameter to storing the measured value in a storage unit.

[Explanation of symbols]

 28A Lens Edge Thickness Measuring Device 28B Eyeglass Lens Diameter Measuring Device 33A Stepping Motor 33B Stepping Motor 36 Measuring Element 37 Elastic Body 39 Strain Gauge 47 Stepping Motor 52 Measuring Element 53a Elastic Body 55 Strain Gauge R Lens Diameter T Edge Thickness w Lens ρi Radial Length

[Procedure amendment]

[Submission date] December 6, 1999 (1999.12.
6)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0001

[Correction method] Change

[Correction contents]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spectacle lens measuring apparatus for measuring a lens in relation to shape measurement information of a spectacle lens frame, and a measuring element used in the apparatus.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0055

[Correction method] Change

[Correction contents]

On the other hand, since the edge thickness of the same lens is measured by the lens edge thickness measuring device during the measurement of the lens diameter by the lens diameter measuring device, the measuring operation of the lens diameter and the edge thickness is made more efficient. In addition, the accuracy of the out-of-fabric check is improved as compared with the case where these measurements are separately performed.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0056

[Correction method] Change

[Correction contents]

On the other hand, since the lens diameter measurement by the lens diameter measuring device is performed prior to the edge thickness measurement by the lens edge thickness measuring device, the lens edge thickness measurement is performed during the simultaneous measurement of the lens diameter and the edge thickness. The tracing stylus of the device can be prevented from coming off the outer periphery of the lens to be measured with a margin.

[Procedure amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0057

[Correction method] Change

[Correction contents]

Thus, the measured value of the arbitrary measurement position by the lens diameter measuring device and the radial length of the position corresponding to the arbitrary measurement position in the measurement information around the optical center of the spectacle lens frame are expressed by the arbitrary position. The cloth to be used to separate the tracing stylus from the lens when the former measured value is smaller than the latter radial length as compared to before the edge thickness measurement at the arbitrary position by the lens edge thickness measuring device after the diameter measurement of the Since the break check means is incorporated, even if the measuring element of the lens edge thickness measuring device deviates from the outer periphery of the lens to be measured, it is possible to reliably prevent the measuring element and the lens from colliding or being caught.

[Procedure amendment 6]

[Document name to be amended] Statement

[Correction target item name] 0058

[Correction method] Change

[Correction contents]

In particular, since a strain gauge and a stepping motor are provided, and the edge thickness or the lens diameter of the lens is measured by linking the strain gauge and the stepping motor, the measurement can be performed independently of the gear backlash. In addition, the contact pressure between the measuring element and the lens can be reduced, so that even a thin lens does not deform due to the contact of the measuring element, so that high-precision measurement can be performed and the lens surface can be prevented from being damaged by the measuring element. is there.

[Procedure amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0059

[Correction method] Change

[Correction contents]

Further, since a measuring element provided with an elastic body is provided, and a strain gauge for measuring a distortion of the measuring element is fixed to the elastic body, the contact pressure between the measuring element and the lens is reduced by the elasticity of the elastic body. And it can be measured independently of the screw gap by the elasticity of the elastic body.

[Procedure amendment 8]

[Document name to be amended] Statement

[Correction target item name] 0060

[Correction method] Change

[Correction contents]

The measuring element of the present apparatus has a parallelogram structure, and a pair of side members facing each other in a specific direction is formed of an elastic body, and the strain of the elastic body is reduced by a strain gauge fixed to the elastic body. Since it is measured, the contact position between the tracing stylus and the lens does not change significantly even when the elastic body is bent by being pressed against the lens, and the lens diameter and the like can be accurately measured. ────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] March 7, 2000 (200.3.7)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claim 1

[Correction method] Change

[Correction contents]

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Shinji Hamamoto 5378 Minoshima-cho, Fukuyama-shi, Hiroshima F-term in Shigiya Seiki Seisakusho Co., Ltd. (reference) 2F069 AA39 AA46 CC10 DD30 GG02 GG59 GG62 GG63 HH02 HH04 MM32 NN12 3C049 AA03 AC02 BA07 BB01 BB09 BC03 CA01

Claims (7)

[Claims] 1. A spectacle lens measuring device comprising a lens edge thickness measuring device and a spectacle lens diameter measuring device. 2. The eyeglass lens measuring apparatus according to claim 1, wherein the edge diameter of the same lens is measured by the lens edge thickness measuring apparatus during the measurement of the lens diameter by the lens diameter measuring apparatus. . 3. The eyeglass lens measuring device according to claim 1, wherein the diameter measurement by the lens diameter measuring device is performed prior to the edge thickness measurement by the lens edge thickness measuring device. 4. A method for measuring a diameter measured value at an arbitrary measurement position by a lens diameter measuring device and a radial length of a position corresponding to the arbitrary measurement position among measurement information around an optical center of an eyeglass lens frame, by using After the diameter measurement, when the former measured value is smaller than the latter radial length as compared with the one before the edge thickness measurement by the lens edge thickness measuring device by the lens edge thickness measuring device, the check of the cloth is performed so that the measuring element is separated from the lens. The spectacle lens measuring device according to any one of claims 1 to 3, further comprising means. 5. An eyeglass lens measuring apparatus comprising a strain gauge and a stepping motor, wherein the edge thickness or the lens diameter of the lens is measured by linking the strain gauge and the stepping motor. 6. A spectacle lens measuring apparatus according to claim 5, further comprising a probe having an elastic body, wherein a strain gauge for measuring a distortion of the elastic body is fixed to the elastic body. 7. A parallelogram structure in which a pair of side members facing each other in a specific direction are formed of an elastic body, and the strain of the elastic body is measured by a strain gauge fixed to the elastic body. A measuring element of the spectacle lens measuring device, characterized in that: