JP2012024744A - Lens holding jig and lens holding method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens holding jig capable of fixing a lens by adsorption without deforming the lens by adsorptivity, and to provide a lens holding method.SOLUTION: The lens holding jig includes: a transfer table which is disposed under the lens spaced from a lower surface of the lens, and a lower surface of which is fixed to an external device by adsorption; and a holding member that holds the edge surface of the lens and the transfer table.

Description

  The present invention relates to a jig for holding a lens, and particularly to a holding jig and a holding method for holding a lens by suction.

  A functional film may be formed on the optical surface of a finished lens that has been ground and polished on the convex and concave surfaces. As one method for forming such a functional film, there is a spin coating method in which a solution containing a functional film material is applied to a rotating lens surface.

For example, Patent Document 1 below describes that while rotating an object such as a lens, liquid is discharged from both above and below the object, and a nozzle that discharges liquid from below is further tilted with respect to the vertical direction. Yes.
According to the following Patent Document 1, when discharging the liquid from the lower direction, the discharge nozzle is inclined with respect to the vertical direction, thereby preventing the appearance defect due to the reattached / contaminated discharged liquid to the nozzle. ing.

Patent Document 2 below describes that a black paint for preventing flare, ghost, and the like is automatically applied to the outer peripheral surface of a lens.
In the method described in Patent Document 2 below, a lens is held on a rotating shaft having a vacuum suction means. Then, centering is performed while the lens is held on the rotating shaft, and the black paint is applied by bringing the applicator close to the lens while rotating the lens.

Japanese Patent Laid-Open No. 9-94519 JP 1993-080206 A

  As described above, when a film such as a functional film is formed on the finished lens, a solution containing the functional film material may be applied to the rotating lens. In such a case, it is necessary to fix the lens to the rotating turntable. For example, as described in Patent Document 2 described above, there is a method of fixing the lens by suction.

FIG. 13 is a cross-sectional view showing an example of a fixing method by adsorption. A lens 11 such as a finished lens is placed on the upper surface of the suction table 40 via an O-ring 41 made of rubber or the like.
Further, the suction table 40 is provided with a suction port 42 penetrating the upper surface thereof, and the lens 11 is sucked and fixed to the suction table 40 by suction from the suction port 42.
Then, the film 11 is formed by dropping a solution containing a functional film material onto the surface of the lens 11 while rotating the lens 11 together with the adsorption table 40.

  However, in recent years, especially in plastic lenses for spectacles, the refractive index has been increasing. For this reason, there are an increasing number of finished lenses that have been processed on both the convex and concave surfaces of the lens and have a central thickness of only a few millimeters.

When fixing such a lens having a thin central portion by suction as shown in FIG. 13, it is necessary to consider the possibility of the lens being deformed by the suction force received by the lens in the direction indicated by the arrow A1. Don't be.
In addition, if a functional film is formed by applying a solution containing a functional film material to a lens that is adsorbed and fixed in a deformed state and then curing, the deformation of the lens will occur due to the rigidity of the hard functional film. Will not return. Even if the deformation returns, there is a possibility that problems such as cracking or peeling off of the functional film may occur.

  In view of the above problems, an object of the present invention is to provide a lens holding jig and a lens holding method capable of sucking and fixing a lens without causing deformation of the lens due to a suction force.

  In order to solve the above problems, the lens holding jig according to the present invention is disposed below the lens with a gap between the lower surface of the lens and the lower surface is attached to and fixed to an external device. And a gripping member for gripping the edge surface of the lens and the transfer table.

  The lens holding method according to the present invention includes a placing step of placing a centering jig on which the lens and the transfer table are arranged on the suction table, a centering jig, and a centering jig and the transfer table. A first centering step for centering. In addition, a second centering step of gripping the lens and centering the lens, a step of attracting the transfer table to the suction table and taking out the centering jig, a side surface of the transfer table, and a lens cover An affixing step is also included in which the surface is fixed by at least two places with a tape member.

According to the lens holding jig of the present invention, the transfer table is fixed by suction, and the lens is fixed to the transfer table fixed by suction by the gripping member. Therefore, the lens is fixed without receiving a suction force by suction.
Further, since the optical surface of the lens is not directly adsorbed, even a lens having an irregular optical surface can be stably held and fixed regardless of the shape of the optical surface.

In addition, a gap is provided between the lower surface of the lens to be fixed and the upper surface of the transfer table. Thereby, since the lens does not contact the transfer table and is fixed only by gripping the edge surface, damage and contamination of the lens can be prevented.
Moreover, even if the functional film material is applied to the optical surface of the lens using the lens holder according to the present invention, and the lens is fixed to the lens holder and cured by ultraviolet rays or heat, the lens and the transfer table Since a gap is provided between them, a rapid temperature rise of the lens is suppressed. For this reason, deformation of the lens due to heat can be prevented.

  Further, when the edge surface of the lens and the transfer table are gripped by the adhesive tape member, the lens holder is configured with a very simple structure. For this reason, a lens can be easily fixed at low cost.

  Further, it is desirable that the gripping member is disposed below the ridge line between the edge surface of the lens and the optical surface on the upper surface side of the lens. That is, the film is uniformly formed on the lens fixed using the lens holding jig according to the present invention by preventing the holding member that holds the edge surface of the lens from protruding from the optical surface on the upper surface side of the lens. be able to.

  Further, at least two or more edge surfaces of the lens to be fixed are exposed, and the exposed edge surface includes a ridge line with the optical surface on the lower surface side of the lens, so that the lens and the transfer table are The above-described gap is opened to the outside air outside the gripping member.

  Further, according to the lens holding method of the present invention, the lens is fixed to the lens holder described above. Therefore, it is possible to fix the lens without receiving a suction force by suction.

  According to the present invention, the lens can be fixed without directly exerting a suction force. For this reason, it is possible to adsorb and fix the lens without deforming it.

It is a perspective view which shows a mode that the lens was fixed to the lens holding jig which concerns on embodiment of this invention. It is a top view which shows a mode that the lens was fixed to the lens holding jig which concerns on embodiment of this invention. It is sectional drawing which shows a mode that the lens was fixed to the lens holding jig which concerns on embodiment of this invention. It is a flowchart which shows the holding method of the lens which concerns on embodiment of this invention. A is a perspective view of a lens and a transfer table arranged on a centering jig as seen from above, B is a perspective view seen from below, and C is a cross-sectional view thereof. A is a perspective view of the centering jig as viewed from above, and B is a perspective view as viewed from below. It is a perspective view which shows a mode that centering of a centering jig and a transfer stand is performed. It is a perspective view which shows a mode that centering of a lens is performed. It is a perspective view which shows the structure of a lens holding hand. It is sectional drawing which shows a mode that a lens holding hand hold | grips a lens. It is a perspective view which shows a mode that a lens holding hand raises a lens. It is a perspective view which shows a mode that the holding member was affixed on the lens and the transfer stand. It is sectional drawing which shows a mode that a lens is adsorbed-fixed by the conventional method.

  Hereinafter, although the lens holding jig which concerns on embodiment of this invention is demonstrated based on FIGS. 1-12, this invention is not limited to the following examples.

1. Configuration of Lens Holding Jig FIG. 1 is a perspective view of a lens holder 100 according to the present invention to which a lens 10 such as a finish lens is fixed, as viewed from below, and FIG. 2 is a top view thereof. FIG. 3 is a cross-sectional view taken along line AA ′ in FIG.

  The lens holding jig 100 according to the present embodiment is provided with a gap between the lower surface of the lens 10 and the lower surface of the lens 10, and the transfer table 20 on which the lower surface is attracted and fixed to an external device, And a gripping member 30 for gripping the edge surface of the lens 10 and the transfer table 20.

  The transfer table 20 is made of, for example, resin, and has a disk shape here. For example, the transfer table 20 is mounted on a suction table 40 provided in a suction fixing device (not shown). Further, when used as a spin coater, this suction fixing device includes, for example, a rotation drive mechanism such as a spindle motor that rotates the suction table 20, a control unit that controls the rotation speed of the suction table 20, and a coating liquid that is applied to the lens surface. It is comprised by providing the supply nozzle to supply.

  Further, as shown in FIG. 3, an O-ring 41 made of, for example, a rubber material is disposed on the suction table 40. The transfer table 20 is fixed to the transfer table 20 via the O-ring 41 by performing suction from the suction port 42 provided in the suction table 40.

A lens 10 such as a finish lens is disposed above the transfer table 20. The edge 10 of the lens 10 and the transfer table 20 are held by the holding member 30, whereby the lens 10 is fixed to the transfer table 20.
For example, an adhesive tape material can be used for the gripping member 20. For example, the lens 10 is fixed to the transfer table 20 by attaching a tape material across the edge surface of the lens 10 and the outer periphery of the transfer table 20.

In the present embodiment, as shown in FIGS. 1 and 2, the gripping member 30 is composed of, for example, two tape members, and the lens 10 and the transfer table 20 are fixed.
Further, the gripping member 30 does not cover the entire outer periphery of the lens 10 or the transfer table 20, and two portions of the edge surfaces 10 a and 10 b of the lens 10 are exposed. Thereby, the space between the lens 10 and the transfer table 20 is released to the outside air outside the gripping member 30. At this location, the ridgeline between the optical surface on the lower surface side of the lens 10 and the edge surface is also exposed.
If the diameter of the transfer table 20 is substantially equal to the diameter of the lens 10, the edge surface of the lens 10 and the outer peripheral surface of the transfer table 20 can be easily fixed with a tape material.

Thus, in the present embodiment, the lens 10 is sucked and fixed to the suction table 40 via the transfer table 20 disposed below the lens 10. Therefore, the lens 10 does not receive the suction force by the suction port 42 of the suction table 40. For this reason, even a thin lens can be securely fixed without being deformed.
Further, when directly adsorbing the optical surface of the lens, it may be difficult to adsorb if the optical surface has a complicated shape. However, in the present embodiment, since it is adsorbed and fixed via the transfer table 20, for example, a progressive power lens can be easily held regardless of the shape of the optical surface.

  The lens 10 is fixed only by gripping the edge surface. Therefore, as shown in FIG. 3, there is a gap between the lens 10 and the transfer table 20, and the lens 10 is disposed above the transfer table 20 without contacting the transfer table 20. . Therefore, it is possible to fix the lens 10 without damaging the optical surface.

As shown in FIG. 1, the upper end of the gripping member 30 is disposed below the ridge line between the upper surface (here, convex surface) of the lens 10 to be fixed and the edge surface of the lens 10.
For example, when film formation is performed on the lens 10, the lens 10 is fixed to the spin coater to which the suction table 40 is connected using the lens holding jig 100 according to the present embodiment. When the gripping member 30 protrudes above the ridge line between the upper surface of the lens 10 and the edge surface of the lens 10, a liquid pool of the coating liquid is generated by the gripping member 30 in spin coating. For this reason, edge beads are likely to be formed on the periphery of the surface of the lens 10, making it difficult to form a film with a uniform film thickness.
Therefore, in the present embodiment, the gripping member 30 is disposed below the ridge line between the upper surface of the lens 10 and the edge surface of the lens 10. Thereby, uniform coating film formation can be performed without forming a liquid pool.

Further, the gap between the lens 10 and the transfer table 20 is opened as described above. For this reason, even if the gas in a space | gap expands, for example by temperature rise, it can escape outside.
Therefore, for example, without removing the lens 10 from the lens holding jig 100, the coating liquid applied onto the lens 10 can be heated and UV-irradiated together with the lens holding jig 100 and cured to form a film.
Thus, since the lens 10 can be cured as it is without removing it from the lens holding jig 100, for example, when the lens 10 is removed, the lens 10 comes into contact with the liquid film applied on the lens 10, and the uniformity of the film is impaired. Foreign matter can be prevented from adhering to the film.

Further, when the coating liquid is heated and cured while the lens 10 is held by the lens holder 100, the lens 10 is disposed with a gap between the lens 10 and the mounting table 20, so that the rapid temperature of the lens 10 is increased. The rise is mitigated.
For example, when a lens is directly placed on a tray or the like and continuously put into the oven, heat is directly received from a net shelf or the like in the oven that is already at a high temperature. Further, at the time of UV curing, the tray or the like receives all the ultraviolet rays that have passed through the lens, and the lens receives heat directly from the tray that has become hot.
However, in the case of the present embodiment, since the temperature rise of the lens 10 is mitigated by the air gap, the deformation of the lens can be suppressed.

  In the case of the present embodiment, the lens 10 after film formation can be detached from the lens holding jig 100 by a simple operation of peeling off the grip member 30 made of a tape material, for example.

2. Lens Fixing Method Next, the process of fixing the lens 10 to the lens holding jig 100 according to the present invention will be described below with reference to FIGS.

FIG. 4 is a flowchart showing a method for holding and fixing the lens 10 to the lens holding jig 100 according to the present embodiment.
The lens holding method according to the present embodiment includes a placement step (step S1) of placing a centering jig on which a lens and a transfer table are arranged on the suction table, and a centering jig. And a first centering step (step S2) for centering the transfer table.
Next, a second centering step (step S3) for gripping the lens and centering the lens, a step of adsorbing the transfer table to the suction table and taking out the centering jig (step S4), An affixing step (step S5) is also included in which the side surface of the mounting table and the edge surface of the lens are fixed by at least two places with a tape member.

First, as shown in FIG. 5A, a centering jig 50 provided with the lens 10 and the transfer table 20 is placed on a suction table 43 provided in a lens fixing device (not shown) (step S1). The suction table 43 may have the same configuration as the suction table 40 shown in FIG. 3C, for example. 5B is a perspective view of this state as viewed from below, and FIG. 5C is a cross-sectional view taken along line BB ′ in FIG. 5B.
As shown in FIGS. 5B and 5C, the lower surface of the transfer table 20 disposed in the centering jig 50 is exposed, and the lower surface of the transfer table 20 is mounted on the suction table 43.

FIG. 6A is a perspective view of the centering jig 50 viewed from above, and FIG. 6B is a perspective view of the centering jig 50 viewed from below.
The centering jig 50 includes a plate portion 51 on which the transfer table 20 is disposed, and a pair of projecting portions 53 that protrude from the upper surface of the plate portion 51 and on which the lens 10 is disposed.

On the lower surface of the plate portion 51, a recess 52 whose inner periphery substantially coincides with the outer periphery of the transfer table 20 is provided. The transfer table 20 is positioned with respect to the centering jig 50 by fitting the transfer table 20 into the recess 52.
In the present embodiment, the recess 52 passes through the plate portion 51, and a flange portion 55 that protrudes inward from the wall surface of the recess 52 abuts on the upper surface of the transfer table 20. However, the recess 52 does not necessarily have to penetrate.

  The pair of projecting portions 53 provided on the upper surface of the plate portion 51 are disposed at positions facing each other with the recessed portion 52 interposed therebetween, for example. Notches 54 are provided on the side surfaces of the pair of protrusions 53 on the recess 52 side, and the peripheral edge of the lens 10 is disposed at the step formed by the notches 54.

Next, as shown in FIG. 7, a pair of centering hands 60 provided in a lens fixing device or the like (not shown) is raised from below, for example, and then the side surface of the centering jig 50 is gripped. Thereby, the centering jig 50 is centered with respect to the suction stand 43, for example. Similarly, the transfer table 20 fixed to the recess 52 of the centering jig 50 is also centered with respect to the suction table 40 when the centering jig 50 is centered (step S2).
The centering hand 60 can be moved in the vertical direction in the figure, and in the front-rear and left-right directions by, for example, a three-axis motor.

  When the transfer table 20 is centered, next, as shown in FIG. 8, a pair of lens gripping hands 61 provided in a lens fixing device (not shown) is lowered from above, for example. Next, the lens gripping hand 61 centers the lens 10 with respect to the suction table 43 by gripping the edge surface of the lens 10 (step S3).

9 is a perspective view of the lens gripping hand 61, and FIG. 10 is a cross-sectional view taken along the line CC ′ of FIG. The lens gripping hand 61 is configured, for example, by providing a notch 63 in a gripping part 62 that extends in a rod shape.
The side surface of the notch 63 is, for example, a concave surface, and its cross section is, for example, an arc shape as shown in the outer periphery 61a of FIG. The diameter of this arc is set smaller than the diameter of the lens 10. Therefore, one lens gripping hand 61 contacts the edge surface of the lens 10 at two points as shown in FIG.

Accordingly, the pair of lens gripping hands 61 presses the edge surface of the lens 10 in the direction in which they face each other, and grips the lens 10 at four points. Thereby, the centering of the lens 10 is performed. The centering hand 60 described above may have the same configuration as the lens gripping hand 61.
Note that the lens gripping hand 61 is connected to the lens fixing device by, for example, fitting the connecting portion 64 protruding from the upper end of the gripping portion 62 into a head or the like of a lens fixing device (not shown).

Further, the lens gripping hand 61 can be moved in the vertical direction in the figure and in the front-rear and left-right directions by, for example, a three-axis motor.
In this example, the lens is centered by two lens gripping hands, but the lens centering may be performed by, for example, three or four lens gripping hands.
Further, by fitting the edge surface of the lens 10 to the step 54 of the centering jig 50, the center axis of the lens 10 and the center axis of the transfer table 20 fitted in the recess 52 of the centering jig 50 are obtained. May be matched.

  When the centering of the lens 10 is finished, the transfer table 20 centered with respect to the suction table 43 is sucked to the suction table 43 and fixed. Then, the centering hand 60 holding the transfer table 20 is lowered, for example. Further, as shown in FIG. 11, the lens gripping hand 61 is lifted while gripping the lens 10 and lifts the lens 10 upward. And the centering jig | tool 50 from which the lens 10 was removed is taken out (step S4).

When the centering jig 50 is taken out, as shown in FIG. 12, the lens gripping hand 61 is lowered, and the lens 10 is disposed at a desired height while maintaining the centered state with respect to the suction table 43. To do. Then, a grip member 30 made of, for example, a tape member is pasted over the edge surface of the lens 10 and the outer periphery of the transfer table 20 (step S5).
Accordingly, the lens 10 and the transfer table 20 are fixed to the suction table 43 in a state of being centered with respect to the suction table 43.

For example, in step S5, the lens 10 is lowered by lowering the lens gripping hand 61.
Then, the radial position and height of the ridge line between the upper surface and the edge surface of the lens 10 are measured using a two-dimensional laser displacement meter or the like.
The measured data is processed by a control unit such as a personal computer provided in the lens fixing device. Based on this data, the gripping member 30 is placed on the edge surface of the lens 10 and the outer peripheral surface of the transfer table 20. Paste across. The operation of the centering hand 60 and the lens gripping hand 61 and the suction control in the suction table 43 are also performed by this control unit.
The gripping member 30 protruding from the upper surface of the lens 10 may be cut by controlling, for example, a cutter, a CO ₂ laser, or the like based on the above-described measurement data on the ridge line between the upper surface of the lens 10 and the edge surface.

However, a gripping member 30 having a width defined in the lateral direction in the drawing is prepared in advance, and the lens 10 is arranged so that the gripping member 30 does not protrude from the upper surface of the lens 10 according to the width of the gripping member 30. You may control the height to install. In this case, it is preferable because a step of cutting the gripping member 30 is not required.
Further, a gripping member having a uniform width may be prepared and pasted in accordance with a desired arrangement height of the lens 10.

The gripping member 30 is not attached to the edge surface of the lens 10 gripped by the lens gripping hand 61 and the side surface of the transfer table 20 positioned below the edge surface. Therefore, the gap between the lens 10 and the transfer table 20 is open to the outside air at the location where the lens gripping hand 61 is gripping.
In the present embodiment, since the lens is gripped by the two lens gripping hands 61, the gap between the lens 10 and the transfer table 20 is opened at two places. The number of locations opened in the gap may be changed as appropriate according to the number of lens gripping hands used.

When the lens 10 and the transfer table 20 are fixed by the gripping member 30, the lens gripping hand 61 opens the lens 10 and moves upward, for example. Further, the transfer table 20 is released from the adsorption to the adsorption table 43. Then, the lens 10 fixed to the lens holding jig 100 is taken out.
When the lens 10 is fixed to the lens holding jig 100 and then removed from the suction table 40, the lens 10 and the transfer table 20 are not necessarily centered on the suction table 40. The center of the transfer table 20 only needs to be on the same axis.

  Further, in the present embodiment, the lens 10 and the transfer table 20 are centered with respect to the suction table 43. For this reason, it is also possible to perform other processing on the lens 10 while the lens 10 is fixed to the suction table 43 by suction.

  The embodiment of the lens holding jig and the lens holding method according to the present invention has been described above. It goes without saying that the present invention includes various conceivable modes without departing from the above-described embodiment and without departing from the gist of the present invention described in the claims.

  DESCRIPTION OF SYMBOLS 10,11 ... Lens, 10a, 10b ... Surface, 20 ... Transfer table, 30 ... Holding member, 40, 43 ... Suction stand, 41 ... O-ring, 42 ... -Suction port, 50 ... Centering jig, 51 ... Plate part, 52 ... Recess, 53 ... Projection part, 54, 63 ... Notch part, 60 ... Centering hand 61 ... Lens gripping hand, 61a ... Outer periphery, 62 ... Holding part, 64 ... Connection part, 100 ... Lens holding jig

Claims (5)

A transfer table disposed below the lens with a gap between the lower surface of the lens and the lower surface of which is adsorbed and fixed to an external device;
A gripping member that grips the edge surface of the lens and the transfer table;
Lens holding jig equipped with.   The lens holding jig according to claim 1, wherein the gripping member is an adhesive tape material.   The lens holding jig according to claim 2, wherein the gripping member is disposed below a ridge line between an edge surface of the lens and an optical surface on the upper surface side of the lens.   4. The lens holding device according to claim 1, wherein at least two or more portions of the edge surface are exposed, and the exposed edge surface includes a ridge line with an optical surface on a lower surface side of the lens. jig. A placement step of placing a centering jig on which the lens and transfer table are disposed on the suction table;
A first centering step of gripping the centering jig and centering the centering jig and the transfer table;
A second centering step of gripping the lens and centering the lens;
Adsorbing the transfer table to the adsorption table and taking out the centering jig;
Affixing step of fixing at least two places of the side surface of the transfer table and the edge surface of the lens with a tape member;
Including a lens holding method.

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