JP2002200547A - Method and device for adhering lens - Google Patents

Abstract

PROBLEM TO BE SOLVED: To finish the side face of a lens highly accurately after polishing the lens by controlling the height of the machined side of the lens in relation to the datum face of an adhesion plate when the lens is adhered through thermoplastic adhesive. SOLUTION: The shaft center of the lens 1 sucked and held on the adhesion plate 15 and that of the adhesion plate 2 held on an adhesion plate holder 22 are aligned with each other, and the adhesion plate 2 to the adhesion face 2b of which thermoplastic adhesive 3 is applied is lowered to preset adhesion height 41. The adhesion height 41 is equal to the distance between the lens receiving face 15a of the adhesion plate 15 and the positioning face 22a of the adhesion plate holder 22, and is calculated by adding any thickness allowing the intervening of the thermoplastic adhesive 3 to the length of the side of the lens 1 measured by a measuring instrument and the known plate height 42 of the adhesion plate 2. After that, the thermoplastic adhesive 3 is solidified and the lens 1 is adhered to the adhesion plate 2 with the lens 1 and the adhesion plate 2 held at their position leaving adhesion height constant.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens sticking method and a sticking device for sticking a lens (lens material) as a workpiece to a sticking tray used in a grinding and polishing apparatus.

[0002]

2. Description of the Related Art Generally, in lens grinding and polishing,
Processing is performed with the lens attached to the attachment plate. At this time, chucking to the processing machine is performed at a predetermined portion of the sticking plate. Most of the attachment of the lens to the attachment plate is performed using an attachment device. Attachment of the lens to the attachment plate greatly affects lens accuracy. As this prior art, for example, a lens sticking device described in Japanese Patent Publication No. 5-67379 is known. This technique will be described with reference to FIGS.

The sticking apparatus mainly includes an adsorbing section 117 for holding and transporting the lens 111, a patch applying unit 113 for applying a hot-melt patch 112 to the sticking surface 111 a of the lens 111, and a lens 111. It comprises a heating centering unit 119 for centering the sticking plate 118 and a cooling unit 124 for solidifying the hot-melt adhesive 112.

As shown in FIG. 12, the suction portion 117 is composed of a tapered suction tube 141 and a lens supply shaft 142 to which the suction tube 114 is attached and which is vertically movable. Is sucked by the suction tube 141 and transported.

As shown in FIG. 13, a patch application unit 113 contains a patch application rod 147 for applying the hot-melt adhesive 112 to the attachment surface 111a of the lens 111 and a hot-melt adhesive 112. And a patch supply device 148. The patch application rod 147 is held so as to be movable up and down, and is set so as to apply the heat-soluble patch 112 in the patch supply device 148 to the sticking surface 111 a of the lens 111.

[0006] The heating centering unit 119 is equipped with a centering stand 121 as shown in FIG.
1 is configured to be heated by a heater (not shown). A pair of chuck claws 176 are provided on the heating centering unit 119 so as to be openable and closable toward the outer peripheral surfaces of the lens 111 and the sticking plate 118. When the centering operation of the lens 111 and the attaching plate 118 is performed by the chuck pawl 176, a concave portion 190 is provided at the tip of the chuck pawl 176 so as not to directly pinch the heat-soluble patch 112. Is formed. A lens 111 and a sticking plate 118 are attached to the tip of each chuck claw 176.
V-shaped notch 1 so as to stably hold
19 (see FIG. 15).

As shown in FIG. 15, the cooling unit 124 has a structure in which each of the chuck claws 176 has a lens 111 and an attaching plate 118.
It is set so that the cooling process can be performed in a state in which and are centered and held. The cooling unit 124 includes a cooling tank 195
And a sticking tray receiving portion 196 disposed in the cooling tank 195.
And a cooling liquid 19 such as water stored in the cooling tank 195.
In the peripheral surface of the attachment tray receiving portion 196, an appropriate number of circulation ports 198 for circulating the coolant 197 are provided.

A method for attaching a lens using the attaching apparatus having the above configuration will be described. First, as shown in FIG. 12, the lens 111 on the lens supply pallet 114 is sucked and held by the suction tube 141 of the suction unit 117, and is conveyed to a position above the patch application unit 113 as shown in FIG. Next, the hot-melt adhesive 112 is applied to the adhesive-side lens surface 111 a of the lens 111 with the adhesive application rod 147. Separately, as shown in FIG. 14, the sticking plate 118 is mounted on the centering stand 121 of the heating centering unit 119, and the sticking plate 118 is heated by a heater (not shown).

Next, the lens 111 is replaced with the hot-melt adhesive patch 11.
2 is pressed to the sticking surface of the sticking plate 118. Then, the lens 111 and the sticking plate 118 are sandwiched by a pair of chuck claws 176, and the lens 111 is centered so that the lens 111 is stuck to a proper position of the sticking plate 118.

After the completion of the centering operation, as shown in FIG. 15, the chuck 111 moves while holding the lens 111 and the sticking tray 118 with the chuck pawl 176, and cools the sticking tray 118 in the cooling tank 195 of the cooling unit 124. Cool by dipping in liquid 197. By this cooling, the hot-melt patch 11
2 solidifies and fixes the lens 111 and the sticking plate 118.

As described above, according to the above-mentioned prior art, even if the excess heat-soluble adhesive 112 protrudes from the outer peripheral surface of the adhesive plate 118 and the lens 111 when the lens 111 is pressed against the adhesive plate 118, the centering is performed. The lens 111 can be attached to the attachment plate 118 while performing.

FIG. 16 shows another attaching apparatus. The pasting device includes the above-described heating centering unit 11 of the related art.
9, a positioning unit 205 and a lens position measuring unit (not shown) for detecting the XYZ coordinates of the center of the lens 111 or the top of the surface of the lens 11 are configured.

The positioning unit 205 is composed of a Z positioning shaft 207 capable of positioning the suction tube 141 in the height direction by, for example, driving a servomotor, and an XY positioning table 208 capable of positioning the sticking plate 118 in the plane direction. In particular, the XY positioning table 208 is configured such that the sticking plate 118 can be heated by a heater (not shown).

A description will be given of a sticking method using the sticking apparatus having the above-described configuration. The lens 111 sucked and held by the suction tube 141 is
The lens position measuring unit (not shown) measures the XYZ position at the center of the attaching surface 111a or, if a concave or convex shape is created on the attaching surface 111a, the XYZ position at the top of the surface.

Then, as in the prior art, the lens 11
A heat-soluble patch 112 is applied to the lens surface 111a on the sticking side of No. 1 and a sticking tray 118 is mounted on the XY positioning table 208 of the positioning unit 205 separately from this.
18 is heated by a heater (not shown). Next, the lens 111 is transported to a position above the positioning unit 205 by the suction tube 141. At this time, based on the XYZ position measurement result of the pasting surface 111a of the lens 111 measured in advance, the XY positioning table 208 is centered on the axis of the pasting plate 118 and the center position of the lens 111, or the top position. The XY coordinates are corrected so as to be in the state.

This can be attained by previously determining the positional relationship between the position of the sticking dish holding portion on the XY positioning table 208 and the suction tube 141.

After the axes of the lens 111 and the sticking plate 118 are determined on the XY plane, the Z positioning axis 207 is
11 is moved by an arbitrary amount to the sticking plate 118 side. This moving amount is set based on the height of the pasting surface 118c of the pasting plate 118 which is known in advance, and an arbitrary pasting height 206 is set from the reference surface 118b of the pasting plate 118, and based on the measurement result of the pasting surface 111a. It is determined by stopping the lowering of the Z-axis positioning shaft 207.

Thereafter, cooling is carried out, and the hot-melt patch 112 is cooled.
Is cured, so that all the attached lenses 11
1 is attached to the reference surface 118b of the attaching plate 118.
Is constant.

[0019]

In order to grind the lens 111 stuck on the sticking plate 118, as shown in FIG. 17, the sticking plate 118 is attached to the tip of the collet chuck 203 of the work shaft of the curve generator. Flange part 11
The lens 111 is spherically formed by a cup-shaped grindstone 202 attached to a grindstone shaft (not shown) by fixing the sticking plate 118 by applying 8a. Also, when measuring the thickness of the lens 111 after grinding or polishing,
As shown in FIG. 18, the flange portion 118 a of the sticking tray 118 is put on the upper surface 201 a of the measuring table 201, and the sticking tray 118 is fixed, and a measuring instrument 200 such as a dial gauge or a magnescale is attached to the top of the lens 111. And inspect whether the inside meat is within the standard.

The lens 111 stuck on the sticking dish 118 (the lens 111 whose sticking surface is a polished surface,
That is, the lens 11 that becomes a product when the processing surface is polished
1) When measuring the thickness of the fillet, since the fill itself of the lens 111 cannot be measured,
The dimension h from the reference surface 118b, which is the lower surface of the flange portion 118a, to the top of the lens 111 is substituted.

However, in the above-described conventional lens attaching method and apparatus, there is an error in the dimension from the attaching surface 111a of the lens 111 to the reference surface 118b of the attaching plate 118. Therefore, even if the dimension h after the grinding and polishing is finished with high accuracy, when the lens 111 is peeled off from the sticking plate 118 and the thickness of the lens 111 is measured, there is a problem that the accuracy of the thickness is reduced. As shown in FIG. 13, the reason why an error occurs in the dimension from the attaching surface 111 a of the lens 111 to the reference 118 b of the attaching plate 118 is that the hot-melt adhesive 112 attached to the adhesive application rod 147 is attached to the attaching surface of the lens 111. 111a, the hot-melt adhesive 112
This is because the application amount varies. This allows
As shown in FIG. 14, when the lens 111 is crimped to the sticking plate 118, a cylinder is used as a crimping means.
Even if the lens 111 is pressed against the sticking plate 118 at a constant pressure, if the amount of the hot-melt adhesive 112 applied varies, the amount of pushing the lens 111 is not stable. Therefore,
The dimensions from the reference surface 118b of the attaching plate 118 to the attaching surface 111a of the lens 111 will vary.

Further, since the viscosity of the hot-melt adhesive 112 varies depending on the temperature, even if the temperature of the adhesive plate 118, the lens 111 or the surrounding environment is slightly changed, the pushing amount of the lens 111 varies. Further, in order to reduce the variation of the pressing amount, the film of the heat-soluble patch 112 is thinned, and the lens 111 is pressed at a high pressure to reduce the influence of the heat-soluble patch 112.
11 is stuck in a state deformed by pressure. Therefore, if the lens 111 is peeled off after the grinding and polishing, the lens 111 with poor surface accuracy is obtained.
Further, as shown in FIG.
It is also conceivable that a dimensional error of each of the sticking plates 118 from 8b to the sticking surface 118c reduces the filling accuracy of the lens 111.

In recent optical systems, there are many demands for smaller diameters and higher accuracy, and particularly for the accuracy of the thickness of each lens 111, the highest accuracy is required. For example, the tolerance value of the conventional filling accuracy was several tens μm (for example, 20 μm), but recently, the tolerance value of several μm (for example, 8 μm)
Some are given only below. However, in the conventional means, due to the fluid effect of the hot-melt adhesive patch 112 caused by the pressing amount at the time of application, the variation in the accuracy of the medium thickness becomes several tens μm, and the demand for the lens accuracy cannot be satisfied. There is a problem.

According to the prior art shown in FIG. 16, the attaching surfaces 111a of all the attached lenses 111 are attached to the attaching plate 11
The crimping height is controlled so that the height of No. 8 from the reference surface 118b is constant. Thus, similarly to the above-described prior art, when the lens 111 is spherically formed by a curve generator as shown in FIG. 17, the position where the lens 111 attached to the attaching plate 118 is spherically processed is ground by all the lenses 111. It does not cause variation exceeding the mechanical accuracy of polishing.

However, when the lens 111 is peeled off from the attaching plate 118 after processing, the lens attaching surface 118a of the attaching plate 118 and the attaching plate 11
The height up to the reference plane 118b of No. 8 has a variation higher than the mechanical accuracy. At the time of processing the lens 111, the temperature is normal temperature (for example, 20 ° C.).
Must be heated above the melting temperature of, for example, this temperature is 80 ° C. or higher.

As a result, since the temperature difference between the time of application and the state of actual application is large, the influence of the state of thermal expansion and contraction of the apparatus and the hot-melt adhesive 112 is affected by the state of the attachment plate 11.
8 reference surface 118b and lens attaching surface 1 of lens 111
A variation occurs in the attachment height 206 with respect to 11a.
For example, even if only the mechanical structure is used, when its constituent material is iron, its linear expansion coefficient is about 1.3 × 10 ⁻⁵ / ° C.
And the temperature difference between the heating and cooling of the sticking plate 118 is about 60.
From 15 ° C. and above, a displacement of about 15 μm per 20 mm simply occurs. The displacement amount of the heating / cooling member such as the sticking tray 118 and the XY positioning table 208 has a sufficiently large influence on the sticking height 206, and it is difficult to remove this. As a result, even in the pasting in the conventional technique, the thickness of each lens 111 varies.

The present invention has been made in view of the above-mentioned problems of the prior art, and when a lens is stuck to a sticking plate via a hot-melt patch, the processing surface side of the lens with respect to the reference surface of the sticking plate is used. It is an object of the present invention to provide a lens sticking method and a sticking device capable of finishing the inside of a lens after grinding and polishing with high precision by controlling the height.

[0028]

In order to solve the above-mentioned problems, a method of attaching a lens according to the first aspect of the present invention is a method of attaching a lens to a sticking plate used in a grinding and polishing apparatus. In the lens attaching method for attaching the lens, after positioning the axis of the lens surface top position or the axis of the center of the lens held on the attaching base, measuring and storing the thickness of the lens, the positioned lens and the attaching plate Is arranged at an arbitrary position in a three-dimensional space, and the heat-soluble patch interposed between the attaching plate and the lens is solidified while maintaining the attaching height of the lens with respect to the attaching plate.

According to a second aspect of the present invention, there is provided a lens attaching method for attaching a lens such as a glass as a workpiece to a sticking plate used in a grinding and polishing apparatus. After positioning the axis of the lens surface top position or the center axis, measure and store the thickness of the lens, place the positioned lens and the sticking plate at any position in the three-dimensional space, The method is characterized in that after the heat-soluble patch interposed between the sticking plate and the lens is solidified while maintaining the lens sticking height with respect to the above, the lens processing side height after sticking is measured.

A lens sticking apparatus according to a third aspect of the present invention is a lens sticking apparatus for sticking a lens such as glass as a workpiece to a sticking dish used in a grinding and polishing apparatus. It has a lens axis positioning means for positioning the axis or the center axis, a means for measuring and storing the thickness of the lens, and a sticking positioning means for arranging the positioned lens and the sticking dish at an arbitrary position in a three-dimensional space. It is characterized by the following.

A lens sticking apparatus according to a fourth aspect of the present invention is a lens sticking apparatus for sticking a lens such as glass as a workpiece to a sticking dish used in a grinding and polishing apparatus. Lens axis positioning means for positioning the axis or the center axis, means for measuring and storing the thickness of the lens, sticking positioning means for arranging the positioned lens and the sticking dish at an arbitrary position in a three-dimensional space, Means for measuring the height of the lens processing side after mounting.

According to the lens sticking method or the lens sticking device according to claim 1 or 3 of the present invention, after positioning the lens on the sticking table, the thickness of the lens at the top or center position of the lens surface. Measure and memorize the height, and fix the lens on the sticking dish by solidifying the hot-melt patch while maintaining the sticking height of the lens with respect to the sticking dish. And the lens can be processed with high accuracy.

According to the lens sticking method or the lens sticking device according to claim 2 or claim 4 of the present invention, claim 1 is claimed.
In addition to the operation described above, the height of the lens attached to the attachment plate is measured, and the amount of grinding and polishing of the lens 1 is controlled based on the measurement result, so that the lens can be processed with a high-precision medium.

[0034]

(Embodiment 1) Embodiment 1 of the present invention will be described with reference to FIGS. FIG. 1 is a perspective view showing a lens sticking device according to the present embodiment, FIG. 2 is a cross-sectional view showing a part of a lens base accommodating a lens, and FIG. FIG. 4 is a cross-sectional view showing a part of a sticking table on which a lens is mounted, and FIG. 5 is a cross-sectional view showing a part of a holding table containing a sticking plate on which the lens 1 is stuck.

As shown in FIG. 1, the lens sticking device comprises a lens base 12 for accommodating a plurality of lenses 1, a sticking tray 13 for accommodating a plurality of sticking dishes 2 for attaching the lenses 1, and a lens 1 for sticking the lenses 1. , A measuring device 16 for measuring the height of the lens 1 attached to the attachment plate 2, and a storage table 1 for accommodating a plurality of attachment plates 2 to which the lens 1 is attached
7, a lens holder 21 for holding the lens 1 of the lens base 12 and transferring the lens 1 to the bonding base 15, and a sticking tray 2 of the sticking tray base 13
A sticking plate holder 22 for holding and transferring the sticking plate to the sticking stand 15;
It mainly comprises a measuring device 23 for recognizing the top of the lens 1 and the like held on the attaching table 15. The lens holder 21, the sticking dish holder 22, and the measuring device 23 are disposed on the vertical portion of the L-shaped gantry 10 of the lens sticking device.
The sticking tray 13, the sticking stand 15, the measuring instrument 16 and the housing 17 are arranged on a plane portion orthogonal to the vertical portion.

The lens base 12 has a Y servo motor 26
a and is mounted on a Y stage 11a having a heating mechanism (not shown) movable in the front-rear direction (Y direction) by a Y linear motion guide 27a, and via a ball screw 28a connected to a Y servo motor 26a. Y stage 11a
And the lens mount 12 can be stopped at any position in the Y direction.

As shown in FIG. 2, the lens mount 12 has an appropriate number of lens holding holes 30 formed at an appropriate diameter and depth in accordance with the outer diameter of the lens 1 at its upper part. In the lens holding hole 30, a lens processing surface 1 b which is a processing side when processing the lens 1 stuck on the sticking plate 2 is formed.
The lens 1 is placed on the bottom surface of the lens 1 and the lens 1 is placed in advance so that the sticking surface 1a of the lens 1 to be stuck to the sticking dish 2 is facing upward.
When the processing surface 1b of the lens 1 is a flat surface, the bottom surface of the lens holding hole 30 is formed in a shape capable of receiving a flat surface stably, such as a flat surface or a three-point receiving surface. When it is formed in a concave or convex shape, it is formed in a tapered or ring-like shape capable of receiving the concave or convex surface stably.

The sticking tray 13 is provided with a Y servo motor 26.
b, and is mounted on a Y stage 11b having a heating mechanism (not shown) movable in the front-rear direction (Y direction) by a Y linear motion guide 27b, and via a ball screw 28b and the like connected to a Y servo motor 26b. Y stage 11b
And the sticking tray 13 can be stopped at any position in the Y direction. The sticking tray 2 accommodated in the sticking tray 13 has a cylindrical shape, and has a lens sticking surface 2b to which the lens 1 is stuck at one end, as shown in FIG. The opposite side of the lens affixing surface 2b is the holding unit 2 that is held by the processing machine when processing the affixing dish holder 22 and the lens 1.
d, and a flange portion 2a is formed between the lens attaching surface 2b and the holding portion 2d.

As shown in FIG. 3, the sticking platen 13 receives the flange portion 2a of the sticking platen 2 on its upper portion, as shown in FIG.
3 so that the sticking plate 2 can be held on the sticking plate holding hole 31.
Are provided in an appropriate number. The attaching plate holding hole 31 is larger than the diameter of the lens attaching surface 2b of the attaching plate 2, the lens attaching surface 2b side is accommodated in the attaching plate holding hole 31, and the holding portion 2d of the attaching plate 2 is attached to the attaching plate. It can be mounted so as to appear on the table 13.

The sticking table 15 is disposed on an XY stage 14 as a lens axis positioning means capable of finely positioning in the left-right and front-rear directions (XY directions). This sticking table 1
As shown in FIG. 4 (a), a lens 5
A suction hole 32 having a diameter smaller than the outer diameter of the suction hole 32 is provided.
A suction device (not shown) is connected to the suction hole 32, and the air in the suction hole 32 is exhausted 33 in the direction of the arrow, whereby
The lens 1 placed on the sticking stand 15 so as to close the suction hole 32 is sucked and held on the lens receiving surface 15a of the sticking stand 15, and the sucking and holding of the lens 1 can be stopped.
It can be evacuated arbitrarily. The attaching table 15 may have any configuration that can hold and release the lens 1. For example, as shown in FIG.
A pair of opposed chuck claws 34 may be configured to be openable and closable. At this time, it is preferable that the opposing surfaces of the pair of chuck claws 34 be formed in a V-shaped surface so that the lens 1 can be stably held by the V-shaped surface.

The measuring device 16 functions as a means for measuring the height on the lens processing side, is a contact type or non-contact type device, and is fixed on the gantry 10 and disposed above the measuring device 16 ( The vertical height of the lens 1) can be measured on the order of microns or sub-microns.

The accommodation table 17 is provided with a Y servo motor 26c.
And the front and rear direction (Y direction) by the Y linear motion guide 27c.
Stage 1 with cooling mechanism (not shown) movable to
1B, the Y stage 11c is moved via a ball screw 28c or the like connected to the Y servo motor 26c, and the accommodation table 17 can be stopped at an arbitrary position in the Y direction.

As shown in FIG. 5, the accommodation table 17 receives the flange 2a of the attachment plate 2 at its upper part, and can hold the attachment plate 2 on the accommodation table 17. It is provided. The sticking plate accommodation hole 35 is formed so as to be larger than the diameter of the lens sticking surface 2b of the sticking plate 2 and the diameter of the lens 1 stuck on the lens sticking surface 2b and to have a sufficient depth. And the lens sticking surface 2b side, and the holding portion 2d of the sticking tray 2 can be mounted so as to appear on the housing 17.

The lens holder 21 is a Z stage 20a.
The sticking plate holder 22 is disposed on the movable table 19a via the Z stage 20b.
And the measuring device 23 is a Z stage 2
0c is provided on the moving table 19c. Mobile platform 1
The moving table 9a, the moving table 19b, and the moving table 19c are arranged on the X stage 18 provided in the vertical portion of the gantry 10, and are independently moved in the left and right direction (X direction) on the X stage 18 by, for example, a path motor. , The lens holder 21, the sticking dish holder 22, and the measuring device 23 can be positioned in the X direction.

The lens holder 21 is disposed on a movable stage 19a on a Z stage 20a which can be moved up and down in the Z direction by a Z servo motor 24a and a Z linear motion guide 25a. The lens holder 21 is configured to be able to hold the outer peripheral portion of the lens 1 at its tip by a suction mechanism (not shown) or a clamp mechanism (not shown).

The sticking tray holder 22 functions as sticking positioning means, and the Z servo motor 24
b and a Z stage 20b which can be moved up and down by a Z linear motion guide 25b. The sticking plate holder 22 is configured to be able to hold the holding portion 2d of the sticking plate 2 at its tip by a suction mechanism (not shown) or a clamp mechanism (not shown).

The measuring device 23 is disposed on a movable stage 19c on a Z stage 20c which can be moved up and down by a Z servo motor 24c and a Z linear motion guide 25c. Note that the measuring device 23 may be arranged on the movable base 19c without the Z servo motor 24c and the Z linear motion guide 25c so as not to move up and down. The measuring device 23 functions as a means for measuring and storing the thickness of the lens, and is of a contact type or a non-contact type, capable of measuring a distance at a minute point by a spot or the like, or capable of performing image processing for positioning. A simple camera may be used, and the distance from the attaching surface 1a of the lens 1 sucked and held on the attaching table 15 is measured, and at least the top of the attaching surface 1a can be recognized.

Next, a method for attaching the lens 1 to the attaching plate 2 using the lens attaching apparatus having the above-described configuration will be described. An arbitrary lens (lens material) 1 and an attaching plate 2 are previously placed in the lens holder 12 and the attaching platen 13 respectively.
0 and put into the sticking dish holding hole 31 and the lens mount 12 is Y
On the stage 11a, the sticking tray 13 is placed on the Y stage 11b.
Place on top. Lens stand 12 and sticking dish stand 13
May be heated by a heating mechanism (heater) (not shown) arranged on the Y-stages 11a and 11b, so that the lens 1 and the sticking plate 2 obtain the preliminary heat according to the temperature set by the heater. Is possible.

Next, the lens stage 12 is moved in the Y direction by the Y stage 11a which moves along the Y linear motion guide 27a by the Y servo motor 26a,
a, the lens holder 21 is moved in the X direction on the X stage 19a, and the lens 1 held in an arbitrary lens holding hole 30 provided in the upper part of the lens mount 12 is moved to the lens holder 2
1 below. Then, the lens holder 21 is moved toward the Z servo motor 2 toward the lens 1 disposed below.
4a and lower by the Z linear motion guide 25a. A shock absorbing mechanism (not shown) is incorporated in the lens holder 21, and when the lens holder 21 comes into contact with the lens 1, the influence on the lens 1 can be removed. When the lens holder 21 comes into contact with the lens 1, the lens holder 21 holds the lens 1 by means such as suction or clamping.

Thereafter, the lens holder 21 is raised, and the lens holder 2 is moved along the X stage 18 by the moving table 19a.
1 is moved in the X direction, and the lens 1 is
After moving up, the lens holder 21 is lowered again and the lens 1 is placed on the sticking stand 15 so as to cover the suction hole 32. At this time, as shown in FIG. 4, the lens processing surface 1b of the lens 1 is placed on the attaching base 15 and the attaching surface 1a is directed upward. Then, the attaching table 15 generates the exhaust air 33 from the suction hole 32, thereby attaching the lens 1 to the attaching table 1.
5 is held by suction on the lens receiving surface 15a. On the other hand, the lens holder 21 releases the holding of the lens 1, moves again above the lens base 12, and retreats from the lens base 12.

When the lens 1 is sucked and held by the attaching table 15, the measuring device 23 is moved along the X stage 18 in the X direction together with the movable table 19c onto the attaching table 15. Then, when the measuring device 23 moves on the sticking stand 15, the movement is stopped, the XY stage 14 is moved in the X direction, which is the left-right direction, by a predetermined range, and the lens 1 held on the sticking stand 15 by suction is held. It is moved in the X direction below the measuring device 23. The stroke from the start to the end of the movement covers the entire end of the lens 1 or, if the lens 1 has a concave surface or a convex shape, covers the vicinity of the top surface. This X
The movement of the Y stage 14 causes the measuring instrument moving axis 39 in FIG.
Thus, the measuring device 23 crosses over the lens 1. At this time, the measuring device 23 and the lens 1
Measure the distance to and continuously. As a result, the output waveform 3 in FIG.
It is possible to obtain the cross-sectional shape of the lens 1 as shown in FIG.

This output waveform 37 indicates that the lens 1
In the case of a flat surface as shown in FIG. 6A, the output is a flat surface, and in the case of a convex surface as shown in FIG. On the concave surface, a shape opposite to the convex surface is obtained. Measuring instrument 2
Depending on the measurement method 3, the output waveform 36 when the lens 1 has a convex surface or a concave surface may not have a shape following the spherical surface, but may have a shape in which the surface top position at the center is protruded. It is not a problem if the top position can be recognized. From the shape of the output waveform 36, the X-axis coordinates of the XY stage 14 when measuring the lens center position 37 or the surface top position 40 when the XY stage 14 moves in the X direction are obtained, and the XY stage 14 is fixed at this position. .

After that, the XY stage 14 is moved in the Y direction which is the front and rear direction by a predetermined range in the same manner as in the case of the X axis.
The lens 1 is moved in the Y direction below the measuring device 23. The output waveform 36 obtained at this time passes through the center coordinates on the X axis of the lens 1, whereby the center position 37 or the surface top position 40 of the lens 1 calculated from the output waveform 36 is obtained.
The XY stage 14 is fixed to the Y-axis coordinate at the time when the measurement was performed. In this state, the sticking table 15 is moved through the XY stage 14.
The central axis of the lens 1 that is held by suction is
The core matches 3. At this time, the distance between the center position 37 or the surface top position 40 of the lens 1 and the lens receiving surface 15a of the attaching base 15 is the thickness 38 of the lens 1 before processing.

Next, the sticking tray 13 is moved in the Y direction by the Y stage 11b which moves along the Y linear motion guide 27b by the Y servo motor 26b,
b is moved in the X direction on the X stage 18,
The sticking tray 2 held in an arbitrary sticking tray holding hole 31 provided at the upper part is positioned below the sticking tray holder 22. Then, the sticking tray holder 22 is moved toward the sticking tray 2 disposed below and the Z servo motor 24 b and the Z linear motion guide 2.
It descends by 5b. The sticking plate holder 22 is provided with a vertically extending / contracting mechanism (not shown). The positioning surface 22a of the sticking plate 2 is positioned on the positioning surface 22a of the sticking plate holder 22 as shown in FIG. The holding portion 2d of the sticking plate 2 is attached to the sticking plate holding portion 2
2 is held by the second holding section 22b. Holding part 2d of sticking plate 2
Is also a device clamp part when performing grinding and polishing,
The axis of the sticking dish 2 and the axis of the sticking dish holder 22 are held by the holding portion 22b of the sticking dish holder 22 by suction or by clamping. The sticking tray holder 22 is adjusted in advance in the positional relationship with the measuring device 23, and after holding the sticking tray 2 with the sticking tray holder 22, moves above the lens 1 held on the sticking stand 15. , Lens 1 shaft and sticking plate 2
It is possible to stop in a state where the axis is centered.

In this state, the hot-melt patch 3 is applied to the sticking surface 2b of the sticking dish 2 by a patch applying unit (not shown) in an appropriate amount. In addition, the application of the hot-melt adhesive patch 3 is as follows.
This may be before the sticking tray 2 is positioned above the lens 1.

When performing the above-described series of operations, the sticking table 15 and the sticking dish holder 22 may heat the lens 1 and the sticking dish 2 by a heater (not shown) configured therein. When the preheating temperature is not excessively cooled, that is, when the temperature is lowered so as not to affect the sticking operation by the hot-melt patch 3, the heating by the sticking table 15 and the sticking dish holder 22 is not necessarily performed. No need.

Next, the sticking dish 2 with the hot-melt patch 3 applied to the sticking surface 2b is held by the sticking dish holder 22 with the lens 1 and the sticking dish 2 centered, as shown in FIG. As described above, it descends to the sticking height 41 set in advance. Pasting height 41
Are the lens receiving surface 15a of the attaching table 15 and the attaching plate holder 2
2 is the distance of the positioning surface 22a, and the measuring device 23
The thickness is calculated by adding an arbitrary thickness where the hot-melt adhesive 3 is interposed to the measured thickness 38 of the lens 1 and the known dish height 42 of the adhesive dish 2. The thickness at which the hot-melt patch 3 is interposed may be such that the sticking height 41 is constant, or the value obtained by subtracting the medium thickness 38 from the sticking height 41 may be constant.

Thereafter, while maintaining the above-mentioned attachment height 41,
Temperature at which the heat-soluble patch 3 starts to solidify (for example, 60
(C), the state of the attaching plate 2 and the lens 1 is maintained. At this time, it is also possible to use forced cooling means (not shown) such as cooling air.

After the hot-melt adhesive 3 has cooled down to a temperature at which the adhesive height 41 is maintained, the exhaust 33 performed in the suction hole 32 of the adhesive base 15 is stopped. By stopping the exhaust 33, the lens 1 is released from the attaching table 15. Then, the sticking plate holder 22 is moved up in the X direction by moving up, and the lens 1 stuck on the sticking plate 2 is moved to a predetermined position on the measuring device 16 together with the sticking plate 2.

As shown in FIG. 9, the measuring device 16 measures a processing surface height 43 which is a distance from the measuring device 16 to the lens processing surface 1b of the lens 1. At this time, measurement of the holder height 44, which is the height of the preset sticking plate holder 22 up to the positioning surface 22a, which is the positioning reference for the sticking plate 2 (positioning surface 2c), or the processing surface height 43 is measured. At the same time, by measuring the holder height 44, which is the distance from the measuring device 16 to the positioning surface 22a of the sticking tray holder 22, the sticking height from the positioning surface 2c of the sticking tray 2 to the lens processing surface 1b of the lens 1 is measured. Can be calculated.

The attached height 41 and the measured lens 1
From the inner meat 38, in the grinding and polishing in the next step,
The cutting amount of the lens 1 based on the positioning surface 2c of the sticking plate 2 is calculated. In addition, the sticking height 41 measured after sticking
It is also possible to feed back the error amount with respect to the thickness obtained in the above at the time of pasting, and to control the processed surface height 43 and the value obtained by subtracting the medium thickness 38 from the pasting height 41 to be constant.

Then, the pasting plate 2 and the lens 1 having undergone the measurement are moved in the X direction together with the pasting plate holder 22 on the X stage 18 toward the housing table 17 by the moving table 19b.
Further, the Y linear motion guide 27c is driven by the Y servo motor 26c.
The Y stage 11c is moved along the
Is moved in the Y direction, and the
An arbitrary number of the sticking dish receiving holes 35 having an appropriate number above the
It is arranged below the attachment tray holder 22. Then, the sticking tray holder 22 is lowered by the Z servo motor 24b and the Z linear motion guide 25b, and the sticking tray 2 is moved toward the sticking tray receiving hole 35 of the storage table 17.

The sticking tray 2 is inserted into the sticking tray receiving hole 35 of the receiving table 17.
Then, the holding of the sticking plate 2 is released and the sticking plate holder 22 is raised. Thereby, the sticking plate 2 to which the lens 1 is stuck is stored on the storage table 17. Accommodation table 17
Above, the cooling device (not shown) configured on the Y stage 11c may remove the residual heat of the sticking plate 2, the lens 1, and the hot-melt patch 3, or may be naturally cooled.

Next, the case of processing both sides of the lens 1 will be described with reference to FIG. As described above, the unprocessed attaching surface 1a of the lens 1 is attached to the lens attaching surface 2b of the attaching plate 2 via the hot-melt adhesive 3, and the lens 1 is attached to the attaching plate as shown in FIG. 2 Then, based on the positioning surface 2c of the sticking plate 2, the sticking plate 2
Is mounted on a processing machine (not shown) to process the lens processing surface 1b of the lens 1.

At this time, since the attachment height 41 from the positioning surface 2c of the attachment plate 2 to the lens processing surface 1b and the thickness 38 of the lens 1 are measured, as shown in FIG.
By obtaining the necessary single-sided processing material 45, a shape such as a spherical surface can be obtained on one surface (processed surface 1c) of the lens 1.

Next, the lens 1 having the above-described structure is peeled off from the sticking plate 2 and the opposite side which is the sticking surface 1a of the lens 1 which has been stuck to the sticking plate 2 is processed. As described above, the sticking plate 2
The processed surface 1c of the lens 1 is stuck on the lens stuck surface 2b of FIG. In this state, the attachment height 41a of the attachment surface 1a opposite to the lens 1 and the thickness 38a of the lens 1 (or the thickness 45 of the one-side processing) are obtained. Based on this value, as shown in FIG. 10 (d), a grinding and polishing amount for performing the grinding and polishing processing to obtain the meat 46 during the double-side processing is obtained, and the opposite side processing is performed.

The processing of the first side of the lens 1 is performed by using the lens 1 attached to the attaching plate 2 without using the above-mentioned lens attaching apparatus. It is also possible to apply to the lens 1 stuck on the sticking plate 2.

According to the present embodiment, the grinding of each lens 1 in the next and subsequent steps is performed based on the height from the positioning surface 2c, which is the processing reference surface of the pasting plate 2 measured after pasting, to the lens processing surface 1b of the lens 1. The polishing amount can be determined. Alternatively, the attachment height 41 is controlled so that the amount of grinding and polishing in the subsequent process is constant, and the lens 1 in the next process is controlled.
It may also be possible to omit individual machine corrections.

Further, since the measurement for determining the amount of grinding and polishing is performed in a processing state after the lens 1 is attached to the attachment plate 2, an error factor caused by an unstable element at the time of attachment is removed. Thus, high-precision lens processing with a lens thickness accuracy of several μm can be realized.

(Embodiment 2) Embodiment 2 of the present invention will be described with reference to FIG. FIG. 11 is a partial sectional view showing a part of the lens attaching device.

In the lens sticking device of the present embodiment, a lens holder 52 is arranged in place of sticking stand 15 at a position corresponding to sticking stand 15 in the first embodiment. The lens holder 52 is provided with at least one or more suction holes 53 for holding the lens 1 by suction. The air in each of the suction holes 53 can be exhausted 54 in the direction of the arrow.

Above the lens holder 52, a sticking dish holder 50 is arranged so as to be arranged. Sticking dish holder 50
1 corresponds to the sticking dish holder 22 of FIG. 1, and the sticking dish holder 50 has suction holes 5 provided in the lens holder 52.
At a position corresponding to 3, a sticking dish holding portion 57 that holds the holding portion 2 d of the sticking tray 2 is provided.

Further, in addition to the sticking dish holder 50, a lens positioning tool 51 is configured to be movable above the lens holder 52 so as to draw a movement locus 55.

The lens positioning tool 51 has a lens centering portion 56 formed in a tapered or ring shape at a position corresponding to the suction hole 53 provided in the lens holding tool 52. Further, the lens positioning tool 51 may be configured to be able to hold the lens 1 by means such as suction.

Further, a sensor (not shown) having the same function as the measuring instrument 16 in FIG. 1 is provided, and this sensor is configured as an XY stage built-in type sensor which can freely move in the XY directions. I have.

Next, a method of attaching a lens to the attaching plate 2 using the attaching device having the above-described configuration will be described. The lens positioning unit 51 collectively holds the lenses 1 on the lens base 12 in FIG. 1, conveys a plurality of lenses 1 collectively on the lens holder 52, and attracts each lens 1 to the lens holder 52. It is placed on the lens holder 52 so as to cover the hole 53. Then, when placing the lens 1 on the lens holder 52, the lens 1 is centered by the lens centering part 56 of the lens positioning tool 51 with an axis corresponding to the center of the sticking dish holding part 57 of the sticking dish holder 50. Is done. Next, the lens holder 52 exhausts the air in the suction hole 53 located below the centered lens 1 in the direction of the arrow 54 to hold and fix each lens 1 on the lens holder 52. And lens 1
Is held on the lens holder 52, the lens positioning tool 51 is retracted from above the lens holder 52 according to the movement locus 55.

Then, the lens 1 having a constant thickness,
If the medium accuracy is not so strict, the thickness measurement of the lens 1 by the measuring device 23 in FIG. 1 is not performed. Next, the thickness of the lens 1 is measured by the measuring device 23. In this case, since the core of the lens 1 has already been implemented by the lens positioning tool 51, only the thickness of the lens 1 can be measured at a predetermined measurement point.

Next, the sticking dish holder 50 collectively holds and positions the plurality of sticking dishes 2 on the sticking tray base 13 in FIG. In this state, the lens holder 5
2, the axis of the lens 1 is made to coincide with the axis of the sticking plate 2, and an appropriate amount of the hot-melt patch 3 is applied to the sticking surface 2 b of each sticking plate 2. The application of the hot-melt adhesive patch 3 may be performed before moving onto the lens holder 52.

Thereafter, the sticking plate holder 50 is lowered, the sticking plate 2 is lowered by an arbitrary amount, and the lens 1 and the sticking plate 2 are joined via the hot-melt patch 3. In this state, the lens 1
After the attachment plate 2 is adhered, the lens 1 attached to the attachment plate 2 by a sensor (not shown) movable in the X and Y directions.
Measure the height of each.

According to the present embodiment, in addition to the effects of the first embodiment, a large number of lenses 1 can be attached at one time.

[0081]

As described above, according to the first aspect of the present invention,
According to the lens affixing method according to the above and the lens affixing device according to the third aspect, the contents of the lens (lens material) are grasped or measured in advance and the lens is attached to the affixing dish while maintaining the affixing height of the lens to the affixing dish. Since the lens is pasted, the lens can be pasted on the pasting plate so that a lens whose inner wall is finished with high precision can be processed in a grinding and polishing process in a later step.

According to the lens sticking method according to the second aspect of the present invention and the lens sticking apparatus according to the fourth aspect, the contents of the lens (lens material) are grasped or measured in advance, and thereby the lens is put on the sticking plate. After pasting, measure the height of the lens processing side with respect to the reference surface of the pasting dish,
It is possible to remove a sticking error factor caused by the sticking operation. Therefore, in the post-process for obtaining the desired medium thickness for the lens,
The lens can be stuck on the sticking plate so that the amount of grinding and polishing becomes clear and the lens whose inner wall is finished with high precision can be processed.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a lens sticking device according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a part of the lens mount according to the first and second embodiments of the present invention.

FIG. 3 is a cross-sectional view showing a part of the pasting plate of Embodiments 1 and 2 of the present invention.

FIG. 4 is a cross-sectional view showing a part of the attaching base according to the first embodiment of the present invention.

FIG. 5 is a cross-sectional view showing a part of the accommodation base according to the first and second embodiments of the present invention.

FIG. 6 is a diagram illustrating lens measurement according to the first embodiment of the present invention.

FIG. 7 is a diagram illustrating a state in which the sticking dish is held in the first embodiment of the present invention.

FIG. 8 is a diagram illustrating a dimensional relationship between a lens and a sticking plate at the time of bonding according to the first embodiment of the present invention.

FIG. 9 is a diagram illustrating measurement of a lens processing surface according to the first embodiment of the present invention.

FIG. 10 is a diagram illustrating a processing state and a measured dimension of the double-side processing of the lens according to the first embodiment of the present invention.

FIG. 11 is a cross-sectional view illustrating a main part of a lens attaching device according to a second embodiment of the present invention.

FIG. 12 is a cross-sectional view showing a suction section according to the related art.

FIG. 13 is a cross-sectional view showing a patch application unit of the related art.

FIG. 14 is a sectional view showing a conventional heating centering unit.

FIG. 15 is a perspective view showing a conventional cooling unit.

FIG. 16 is a cross-sectional view showing a state in which a lens and a pasting plate of the related art are pasted.

FIG. 17 is a partial cross-sectional view showing a state in which a lens pasted on a pasting plate in the related art is subjected to spherical surface creation processing.

FIG. 18 is a partial cross-sectional view showing a state in which a dimension of a lens stuck on a sticking tray in the related art is measured.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lens 1a Adhering surface 1b Lens processing surface 2 Adhering plate 2b Lens adhering surface 2c Positioning surface 3 Heat-soluble adhesive 12 Lens stand 13 Adhering plate stand 14 XY stage 15 Adhering stand 16 Measuring instrument 17 Storage table 21, 51 Lens holder 22, 50 Attaching plate holder 23 Measuring device 30 Lens holding hole 31 Attaching plate holding hole 32, 53 Suction hole 36 Output waveform 38 Medium thickness 40 Top height 41 Attaching height 42 Dish height 43 Processing surface height 44 Holding Tool height 51 Lens positioning tool

Claims (4)

[Claims] 1. A lens sticking method for sticking a lens such as glass which is a workpiece to a sticking plate used in a grinding and polishing apparatus, wherein the lens or the center of the lens surface top position of the lens held on the sticking table is placed. After performing the axial positioning, measure and store the thickness of the lens, place the positioned lens and the sticking plate at an arbitrary position in the three-dimensional space, and stick while maintaining the sticking height of the lens with respect to the sticking plate. A method for attaching a lens, comprising: solidifying a hot-melt adhesive patch interposed between a dish and a lens. 2. A lens sticking method for sticking a lens such as glass, which is a workpiece, to an sticking tray used in a grinding and polishing apparatus, wherein an axis or a center of a lens surface top position of the lens held on the sticking table is provided. After performing the axial positioning, measure and store the thickness of the lens, place the positioned lens and the sticking plate at an arbitrary position in the three-dimensional space, and stick while maintaining the sticking height of the lens with respect to the sticking plate. A method for attaching a lens, comprising: after solidifying a hot-melt adhesive placed between a plate and a lens, measuring the height of the lens processing side after the application. 3. A lens axis positioning device for positioning an axis at a lens surface top position or an axis at a center in a lens adhering apparatus for adhering a lens such as glass as a workpiece to a sticking dish used in a grinding and polishing apparatus. A lens sticking apparatus comprising: means, means for measuring and storing the thickness of a lens, and sticking positioning means for arranging the positioned lens and sticking plate at an arbitrary position in a three-dimensional space. 4. A lens affixing apparatus for affixing a lens such as glass as a workpiece to a laminating dish used in a grinding and polishing apparatus. Means, means for measuring and storing the thickness of the lens, means for attaching and positioning the positioned lens and attaching plate at an arbitrary position in a three-dimensional space, and means for measuring the height of the lens processing side after attaching And a lens sticking device.