JP3892992B2 - Eyeglass lens centering device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an unprocessed spectacle lens before edging in a spectacle lens processing step in which the spectacle lens is edged into a predetermined frame shape based on various conditions such as spectacle frame shape information, prescription values, and processing information. The present invention relates to a centering device for spectacle lenses for attaching to a lens holder of a lens processing device.
[0002]
[Prior art]
When producing spectacles, the wearer's eye is first examined and the prescription value of the lens is determined. Next, when this prescription value is determined, the optical layout of the unprocessed spectacle lens (also referred to as unprocessed lens) is taken into account according to the frame shape selected by the wearer (the optical center for distance). And the near optical center position, power, astigmatism axis, etc.) are adjusted, and a plurality of processes such as roughing and beveling are performed to trim the spectacle lens into a frame shape.
[0003]
At this time, the processing control data of the lens processing apparatus is created based on the optical center position of the lens, the geometric center position of the frame, or a relative position from these positions. Therefore, it is necessary to attach the processing jig to the processing reference position of these lenses so as not to shift the axis.
[0004]
In the case of a single focus lens, the optical center and the geometric center position are designed so as to coincide with each other except for a special lens design. Thus, for example, in the processing process of a single focus lens, first, when a prescription lens is determined, a prescription lens is selected from stock lenses in the case of normal prescription, and a new lens blank is selected in the case of a lens without stock. A prescription lens is manufactured through a process such as sanding and polishing.
[0005]
And this prescription lens is horizontally accommodated in a lens storage tray together with a lens processing instruction sheet, and is conveyed to a production line. Then, the operator takes out the non-prescription lens from the tray and places it on an inspection table of a predetermined inspection device such as a lens meter, and inspects the optical layout such as the lens power and the astigmatic axis of the selected prescription lens. Thereafter, the lens holder of the edging apparatus is mounted at the optical center (geometric center) position of the lens.
[0006]
Next, the lens holder holding the lens is attached to the lens holding portion of the edging apparatus, and the lens is edged.
[0007]
When transporting, inspecting, and processing such an unprocessed lens, it is necessary to prevent damage to the optical surface of the lens. Also, in recent years, the lens processing process has been automated, but due to problems such as difficulty in handling the lens that the jig cannot be brought into contact with the surface of the lens and the lens support part is only the end surface of the lens. In addition, transportation, holding, and alignment (centering) between the processes depend on the manual work of the operator. For example, when holding an unprocessed lens with the lens holder of the edging apparatus, the operator places the unprocessed lens on the lens mounting plate, centers it, and then sucks and holds it with the lens holder. It is intended to be mounted on the processing equipment.
[0008]
[Problems to be solved by the invention]
As described above, in the conventional lens processing, the centering operation of the spectacle lens is mainly performed manually because of the difficulty of handling. However, manual centering has problems such as not only low work efficiency, but also the lens surface becomes dirty or scratched, and the centering accuracy is low.
In particular, in the case of a deformed lens other than a circle such as an ellipse, the centering operation is more difficult than a circular lens.
[0009]
The present invention has been made to solve the above-described conventional problems, and its purpose is to enable high-precision and automatic centering of spectacle lenses of various shapes with a relatively simple structure. Another object of the present invention is to provide a centering device for a spectacle lens.
[0010]
[Means for Solving the Problems]
First invention to achieve the above object, tilts in the same direction at substantially the same angle with respect to each of the plurality of radiation emitted at approximately equal intervals Oite linearly from the centering position around the centering position A lens mounting plate on which an unprocessed spectacle lens is mounted, a plurality of lens pressing members for pressing and moving the spectacle lens, and the lens pressing A plurality of urging means for urging each member in the lens pressing direction; and a driving device for returning each lens pressing member to an initial position against the urging means , wherein each lens pressing member includes The eyeglass lens is moved by simultaneously contacting and pressing the outer periphery of the spectacle lens by moving in the lens pressing direction all at once and substantially at the same speed along each guide portion. Wherein the pressing by the lens pressing member, it is characterized in that is centered by the lens center by the component force moves with the rotation in a direction approaching to the centering position.
[0011]
The second invention is characterized in that, in the first invention described above, the guide portion is a long hole consisting of 5 to 6 formed in a straight line , and an inclination angle with respect to the radiation is 20 to 50 °. To do.
[0012]
In the present invention, the guide portion is inclined with respect to the linear radiation radiated from the centering position. Therefore, the center line of the guide portion does not pass through the centering position. When the lens pressing member moves along the guide portion in the lens pressing direction by the urging force of the urging means and presses the spectacle lens, the spectacle lens moves and its center (optical center or geometric center) is centered. It almost coincides with the position. Thereby, even an irregular lens other than a circle such as an ellipse or a rectangle can be centered.
In this centering mechanism, when the number of guide portions is 5 to 6, centering can be performed satisfactorily. If it is less than this, the distance between adjacent lens pressing members becomes wide, so that the accuracy of centering decreases, and if it is 6 or more, the number of parts increases and the apparatus itself becomes complicated and large, which is not preferable.
A tension coil spring is used as the biasing means of the lens pressing member.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.
FIG. 1 is an external perspective view showing an embodiment of a spectacle lens centering device according to the present invention immediately before centering, FIG. 2 is a sectional view of the device, and FIG. 3 is a centering shown with the lens mounting plate of the device removed. FIG. 4 is a plan view of the apparatus with the lens mounting plate removed, and FIG. 5 is a plan view of the lens mounting plate.
[0014]
In these drawings, the spectacle lens centering device 1 includes a lens mounting plate 3 on which an unprocessed spectacle lens 2 is mounted with the concave side down, and a substrate 4 on which the lens mounting plate 3 is installed. It has.
[0015]
The lens mounting plate 3 is formed in a square shape by a metal plate such as stainless steel, and each corner portion is fixed to the upper surface of the spacing member 5 erected on the upper surface of the substrate 4 by hexagon socket bolts 6.
[0016]
The lens placing plate 3 has five guide portions 7 (7a to 7e) for guiding the lens pressing members 8 (8a to 8e), respectively. The guide portion 7 is composed of a straight long hole, and as shown in FIG. It is formed so as to be inclined at a predetermined angle. More specifically, the guide portions 7a to 7e have five points 11a to 11e that are spaced apart at a substantially equal angle θ (= 72 °) in the circumferential direction on the same virtual circumference 10 centered on the centering position S. Each of the five straight lines (radiations) L1 to L5 connecting the center of the circumference 11, that is, the centering position S, is formed so as to intersect at the same angle α (except 90 °). For this reason, the center line of each guide part 7a-7e does not cross the centering position S. In the present invention, such guide portions 7a to 7e are referred to as “guide portions intersecting with radiation” . In the center of the upper surface of the lens mounting plate 3, a cross line 9a representing the centering position S and a small circle 9b surrounding the cross line 9a are displayed.
[0017]
If the crossing angle α between the guide portions 7a to 7e and the straight lines L1 to L5 is too large, it takes a long time for centering, which is not preferable. In addition, the size of the lens that can be centered is limited to a lens whose radius is larger than the distance d1 from the centering position S to the inner terminal portion Q1 of the guide portion 7 and smaller than the distance d2 to the outer terminal portion Q2, so that the angle α If is large, the difference between the distance d1 and the distance d2 is small, and the size of the lens is limited. On the other hand, if the angle α is made small, the centering accuracy of the deformed lens is not preferable. Further, since the slider 14e, which will be described later, protrudes to the side of the substrate 4 in the initial state, the apparatus itself is increased in size.
[0018]
Therefore, the angle α is determined in consideration of the time required for centering, the size of the spectacle lens 2, the size of the device itself, etc., but is preferably in the range of 20 to 50 °, and more practically optimal. A preferable range is 25 ± 5 °. In the present embodiment, an example in which the guide portion 7 is formed with an angle α of 25 ° is shown. When the angle α is 90 °, the guide portion 7 does not approach the centering position S, and thus cannot be put to practical use. In FIG. 5, the guide portions 7a to 7e are formed so as to be positioned on the left side of the straight lines L1 to L5 when viewed from the centering position S, but may be formed so as to be positioned on the right side. In this case, the angle is −α and the inclination direction is opposite.
[0019]
The guide portions 7a to 7e are all equal in length (for example, 35 mm), and the distance d1 from the centering position S to the inner end portion Q1 is set to be smaller than the radius of the smallest spectacle lens to be centered. The distance d2 (for example, 57 mm) is set larger than the radius of the largest spectacle lens to be centered.
[0020]
The centering position S coincides with the center of the lens placing plate 3, but is not limited to this and may be a slightly decentered position.
[0021]
2 to 4, the lens pressing members 8a to 8e are formed of pins having a circular cross-sectional shape, and sliders 14a to 14e are slidably disposed on the substrate 4 via linear guides 13a to 13e. The upper end portion of the lens mounting plate 3 protrudes above the lens mounting plate 3 by being slidably inserted into the guide portions 7a to 7e. In addition, the lens pressing members 8a to 8e are rotatably fitted with cylindrical bodies 15 formed of a material having a small friction coefficient such as a fluorine resin in order to reduce the friction with the unprocessed lens 2. .
[0022]
The linear guides 13a to 13e are fixed on the substrate 4 so as to be parallel to the side surface opposite to the centering position S side of the guide portions 7a to 7e at an appropriate interval. The sliders 14a to 14e are urged by the urging means 16 in the direction in which the lens pressing members 8a to 8e approach the centering position S, that is, the lens pressing direction. A tension coil spring is used as the urging means 16, one end of which is locked to a locking pin 17 provided on the side surface of the sliders 14 a to 14 e, and the other end to a locking pin 18 provided on the substrate 4. It is locked. The tensions of the tension coil springs 16 that bias the sliders 14a to 14e are all equal, and are set to be relatively small in order to prevent the lens from being damaged when the lens pressing member 8 hits the unprocessed lens 2 during centering. Yes.
[0023]
The substrate 4 is made of a metal such as stainless steel and is formed in a substantially square shape having substantially the same size as the lens mounting plate 3. In addition to the linear guides 13 a to 13 e on the upper surface, sliders 14 a to 14 e are placed at initial positions. A stopper pin 19 is provided to be locked. Here, among the five sliders 14a to 14e which are brought into contact with the stopper pin 19 and locked at the initial position, the slider 14e whose movement direction is moved at an angle close to a right angle with the side of the substrate 4 (same for 14a and 14b). In this case, the rear end portion protrudes to the side of the substrate 4 as shown in FIG. Therefore, in order to reduce the size of the apparatus, the angle α (FIG. 5) of the guide portions 7a to 7e is increased, or the positions of the guide portions 7a to 7e, the linear guides 13a to 13e, and the sliders 14a to 14e are set. The centering position S may be shifted from the center in the circumferential direction to reduce the protrusion amount.
[0024]
Further, the substrate 4 is provided with a driving device 21 for returning the lens pressing member 8 to the initial position against the tension coil spring 16. The drive device 21 includes a rotary actuator 22 fixed to the center of the lower surface of the substrate 4 by a plurality of bolts 26, and a rotary blade 24 fixed to a rotary shaft 23 of the rotary actuator 22.
[0025]
As the rotary actuator 22, for example, a well-known pneumatic rotary actuator (CDRQBS30-90-C-J79) manufactured by SMC is used. The rotary actuator 22 includes two cylinders provided on both sides of the rotary shaft 23 and two pistons (both not shown) respectively disposed in these cylinders. By alternately supplying air into the cylinder and driving the piston of the air supply side port, the movement of this piston is transmitted to the rotary shaft 23 and the other piston via a pinion and a rack (not shown), The rotary blade 24 is rotated by a predetermined angle (90 °). The rotating shaft 23 protrudes above the substrate 4 through an insertion hole 28 formed in the center of the substrate 4, and the rotating blade 24 is attached to the protruding end portion.
[0026]
The rotary blade 24 has a cylindrical main body 30 that is attached to the rotary shaft 23 through a key 29 so as not to rotate and is prevented from moving in the axial direction. 72 °) and five bars 31a to 31e provided radially and spaced apart from each other. The bars 31a to 31e have a length sufficient to return the lens pressing members 8a to 8e to the initial positions.
[0027]
Next, the centering operation of the unprocessed lens by the centering device 1 will be described.
3 and 4, the sliders 14 a to 14 e are moved in the lens pressing direction by the tension coil spring 16, and the lens pressing members 8 a to 8 e are positioned at the inner terminal portion Q 1 (FIG. 5) of the guide portions 7 a to 7 e. The state closest to the position S is shown. In this state, the bars 31a to 31e of the rotary blade 24 are separated from the lens pressing members 8a to 8e.
[0028]
3 and 4, the air pressure 25 is supplied to the air port 25a to drive the rotary actuator 22 and return the lens pressing members 8a to 8e to the initial positions. That is, when air is supplied to the air port 25a and the rotary actuator 22 is driven, the rotary blade 24 rotates clockwise by a predetermined angle from the state shown in FIGS. 3 and 4, so that each of the bars 31a to 31e corresponds to the lens pressing members 8a to 8a. 8e is pressed and moved to the outer terminal portion Q2 (FIG. 5) of the guide portions 7a to 7d against the tension coil spring 16. Accordingly, the lens pressing members 8a to 8e are returned to the initial positions and are locked by the bars 31a to 31e. FIG. 1 shows this initial state.
[0029]
When the lens pressing members 8a to 8e return to the initial positions, the unprocessed lens 2 can be centered. Therefore, the unprocessed lens 2 in the tray is sucked and held by the suction pad provided at the tip of the robot hand (not shown) and placed on the lens placing plate 3. Since the tray for storing the raw lens 2 is used for storing various lenses having different sizes and shapes, the raw lens is not usually positioned and stored. Therefore, when the suction pad holds the raw lens by suction, the center of the suction pad and the center of the raw lens (optical center or geometric center) do not coincide with each other, and the suction pad is lowered to the centering position S in this state. Even if the raw lens 2 is placed on the lens mounting plate 3, the center of the raw lens 2 cannot be matched with the centering position S. When the raw lens 2 is placed on the lens placement plate 3, the suction pad rises and returns to the upper side of the tray.
[0030]
Here, the raw lens 2 is circular, and the center (optical center or geometric center) W of the raw lens 2 is displaced from the centering position S by X toward the upper right in the 45 ° direction as shown by the solid line in FIG. It is assumed that it is placed on the placing plate 3. The diagonally upper right direction in the 45 ° direction is substantially equal to the angle γ formed by the two straight lines 51 and 52 connecting the outer end portions (Q2) of the two adjacent guide portions 7a and 7b and the centering position S. The direction to divide.
[0031]
In this state, the latching state of the lens pressing members 8a to 8e by the bars 31a to 31e of the rotary blade 24 is released, and the unprocessed lens 2 is centered. Release of the locked state of the lens pressing members 8 a to 8 e is performed by switching the supply of air to the rotary actuator 22. That is, when the supply of air to one air port 25a is stopped and the rotary actuator 22 is driven by supplying air to the other air port 25b, the rotating blades 24 rotate in the opposite direction to the above, so the bars 31a to 31e. Is separated from the lens pressing members 8a to 8e to release the locked state. Accordingly, the lens pressing members 8a to 8e move all at once at substantially the same speed in the lens pressing direction along the guide portions 7a to 7e by the tension of the tension coil spring 16. At this time, since the raw lens 2 is placed eccentrically and obliquely upward to the right in the 45 ° direction, the lens pressing member 8a first contacts the outer periphery of the raw lens 2 and presses it. Therefore, the raw lens 2 moves in the direction of the component force P1. This movement is generally accompanied by rotation. The moving direction by the component force P1 is a direction in which the center W of the unprocessed lens 2 approaches the centering position S.
[0032]
Next, the lens pressing member 8b comes into contact with the raw lens 2 and presses it. Therefore, the raw lens 2 moves in the direction of the component force P2. The moving direction by the component force P2 is also the direction in which the center W of the unprocessed lens 2 approaches the centering position S. Next, when the lens pressing members 8c, 8d and 8e sequentially contact the raw lens 2, the raw lens 2 moves in the direction of its component forces P3, P4 and P5, and finally these five lens pressing members 8a. By being held by ˜8e, the center W substantially coincides with the centering position S as indicated by a two-dot chain line.
[0033]
Here has been described centering circular unprocessed lens 2, oval or an irregular lens is not limited to this, even trapezoidal lens 2A is close to a rectangle as shown in FIG. 7, for example, a circular lens It can be centered as well. The order in which the lens pressing members 8a to 8e come into contact with the unprocessed lens at the time of centering varies depending on the shape of the lens, the mounting position, and the like. In the case of a circular lens, the unprocessed lens can be held by all the lens pressing members 8a to 8e when centered. However, in the case of the deformed lens 2A, one or two lens pressing members are lenses. May not touch. The accuracy of centering can be increased by setting the tensions of all the tension coil springs 13 to be equal, but an error of about ± 2 mm has no practical problem.
[0034]
When centering of the unprocessed lens 2 is completed, the lens holder 53 (FIG. 2) of the edging apparatus is lowered to the centering position S to hold the unprocessed lens 2 by suction. The center of the lens holder 53 and the centered unprocessed lens 2 are substantially coincident. Then, the rotary actuator 22 is driven to return all the lens pressing members 8a to 8e to the initial position against the tension coil spring 16, thereby releasing the lens holding state. Then, the lens holder 53 is raised and attached to the edging apparatus, and the edging process of the unprocessed lens 2 is performed.
[0035]
As described above, in the present invention, the five guide portions 7a to 7e are provided around the centering position S so as to intersect the radiation, and are not moved by the five lens pressing members 8a to 8e moving along these guide portions. Since the processing lens 2 is configured to be pressed to be centered, it is possible to reliably center not only a circular lens but also a spectacle lens having another shape.
[0036]
In the above-described embodiment, an example in which the guide portions 7a to 7e are formed in a straight line is shown, but the present invention is not limited to this and may be a curved line.
In the present embodiment, the lens pressing members 8a to 8e are moved by the linear guides 13a to 13e and the sliders 14a to 14e. However, in the present invention, the linear guide and the slider are not necessarily required. .
In addition, although the example in which five lens pressing members 8 are provided has been shown, the centering accuracy is low because the distance between the adjacent lens pressing members is wide with 3 to 4 because the centering cannot be performed with two. If it is more than the number, the number of parts increases and the structure becomes complicated. Therefore, the optimum number is 5.
[0037]
【The invention's effect】
As described above, according to the spectacle lens centering device of the present invention, various lenses having different shapes such as a circle, an ellipse, and a rectangle can be accurately centered, and the workability of the centering work can be improved. Can do. Further, the surface of the spectacle lens is not soiled or damaged. Furthermore, since the structure of the apparatus itself is simple and there is only one driving device for the lens pressing member, it can be manufactured at low cost.
[Brief description of the drawings]
FIG. 1 is an external perspective view of an eyeglass lens centering device according to an embodiment of the present invention immediately before centering.
FIG. 2 is a sectional view of the apparatus.
FIG. 3 is a perspective view showing the apparatus with the lens mounting plate removed.
FIG. 4 is a plan view showing the apparatus with the lens mounting plate removed.
FIG. 5 is a plan view of a lens mounting plate.
FIG. 6 is a diagram for explaining a centering operation.
FIG. 7 is a front view of a trapezoid lens.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Centering apparatus, 2 ... Eyeglass lens (raw lens), 3 ... Lens mounting plate, 4 ... Board | substrate, 7, 7a-7e ... Guide part, 8, 8a-8e ... Lens pressing member, 13 ... Tensile coil spring , 21 ... driving device, 22 ... rotary actuator, 23 ... rotating shaft, 24 ... rotating blade, 31a to 31e ... bar, S ... centering position, W ... center of lens.

Claims (2)

Not having a plurality of guide portions formed to be inclined in the same direction at substantially the same angle with respect to each of the plurality of radiation emitted at approximately equal intervals Oite linearly from the centering position around the centering position A lens mounting plate on which the processed spectacle lens is mounted;
A plurality of lens pressing members for pressing and moving the eyeglass lens to center the lens;
A plurality of biasing means for biasing each of the lens pressing members in the lens pressing direction;
A drive device for returning each lens pressing member to the initial position against the biasing means ,
Each of the lens pressing members is moved in the lens pressing direction all at once and substantially at the same speed along each guide portion to sequentially contact and press the outer periphery of the spectacle lens to move the spectacle lens,
The eyeglass lens is centered by being pressed by each of the lens pressing members so that the center of the lens moves with rotation in a direction approaching the centering position by the component force . The centering device for spectacle lenses according to claim 1,
An eyeglass lens centering device, wherein the guide portion is a long hole composed of 5 to 6 formed in a straight line, and an inclination angle with respect to the radiation is 20 to 50 °.

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