JP2001047347A - Lens holder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens holder capable of heightening the tight attachment coupling force with an adhesive pad and holding a lens in high accuracy. SOLUTION: A lens holder 19 is structured so that a lens is mounted at the forefront of a lens holding shaft to hold the lens in its center and put in pressure contact with the convex surface of the lens through an adhesive pad, wherein the lens holding surface 197 in concave spherical form to be put in pressure contact with the convex lens surface is provided with a number of minute projections and recesses 198 for increasing the tight attachment coupling force with the pad. The section of these projections and recesses 198 has an angle shape in which the wall surface 198b in front in rotating direction of the lens holding shaft and the wall surface 198c in the rear are formed from slopes having the same angle substantially.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens holder used for a lens processing apparatus for processing a lens such as an eyeglass lens or a lens measuring apparatus for measuring a lens shape.

[0002]

2. Description of the Related Art For example, in order to frame a lens to be processed such as an eyeglass lens into a lens frame, in a lens processing apparatus for processing the periphery of the lens to be processed into a predetermined shape, a lens to be processed is held in a lens holding unit. To make it contact with the grindstone or cutter. In this case, the lens holding unit is provided with two holding shafts as shown in Japanese Patent Application Laid-Open No. 9-225798, and a lens holder and a lens attached to the tips of these two holding shafts. The lens is pinched by pressing the holding member against the lens surface.

Here, a lens holder (usually 28 to 35 mm) is used.
φ) is designed to be in pressure contact with the convex lens surface of the lens via the adhesive pad, and the lens holding surface that is in pressure contact with the lens surface has fine irregularities to increase the tight bonding force with the thin adhesive pad. Is provided. In addition, many types of these lens holders having a curvature corresponding to each lens power (every 0.5 diopter) have been prepared.

[0004]

By the way, in the conventional lens holder, the cross-sectional shape of the minute unevenness formed on the lens holding surface is made to be a one-slope surface in consideration of the rotation direction, and the cross-section of the lens holder is caused by a biting action on the adhesive pad caused by the rotation. , To maintain the bonding force with the adhesive pad.

[0005] However, in the case where the one-sided-shaped minute unevenness is formed on the lens holding surface, a biting effect on a thin adhesive pad can be expected, but when the adhesive pad is thick, the adhesion strength is not always high. In addition, because of the single bevel shape, when a pressing force is applied between the adhesive pad and the adhesive pad, an unnecessary rotational force is applied to the adhesive pad, and the rotational force causes the adhesive pad to slightly shift in the rotational direction, There is a possibility that high-precision lens holding may be affected. In addition, if the outer diameter of the lens holder is large, interference of a tool occurs in the crab-shaped frame, and a new measure for such a small frame has been required.

The present invention has been made in view of the above circumstances, and has as its object to provide a lens holder that can increase the tight bonding force with an adhesive pad and that can hold a lens with high precision.

[0007]

According to a first aspect of the present invention, there is provided a lens mounted on a front end of a lens holding shaft for holding a lens at a center portion of the lens, and pressed against a convex lens surface of the lens via an adhesive pad. In the holder, a large number of minute irregularities are formed on the concave spherical lens holding surface that is in pressure contact with the convex side lens surface to increase the tight bonding force with the adhesive pad,
The cross-sectional shape of the minute unevenness is characterized by being formed in a mountain-shaped cross-section in which the front wall surface and the rear wall surface in the rotation direction of the lens holding shaft are formed by inclined surfaces having substantially the same angle.

In the lens holder according to the present invention, when the adhesive pad is pressed against the fine unevenness having the cross-sectional shape of both slopes, the adhesive pad comes into close contact with both slopes of the fine unevenness, and the contact area is increased. Increases, and the lens holding force increases. In addition, since the adhesive pads are evenly pressed against the two inclined surfaces having the same inclination angle, unnecessary rotational force is canceled and no longer occurs. Therefore, it is possible to prevent the adhesive pad from being displaced in the rotation direction and the holding accuracy of the lens from being reduced.

According to a second aspect of the present invention, in the first aspect, the minute irregularities of the chevron-shaped cross section are radially centered on the axis of the lens holding shaft as concave and convex ridges extending in a radial direction of the lens holding surface. It is characterized by being arranged.

In the lens holder according to the present invention, since the minute unevenness is formed radially about the axis of the lens holding shaft, the lens can be held accurately with no deviation in the circumferential and radial directions. Can be.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing the overall configuration of a lens processing apparatus provided with a lens holder according to an embodiment of the present invention, FIG. 2 is a plan view showing the overall configuration, and FIG. 3 is a front view of the overall configuration seen from the front side of the apparatus. It is a figure, and demonstrates the whole structure of a lens processing apparatus first.

This processing apparatus 10 is not a grinding type apparatus for grinding a lens peripheral surface with a grindstone as in the prior art, but a cutting type lens processing apparatus for forcibly cutting the lens peripheral surface with a rotary cutting tool. . This type of cutting lens processing apparatus is effective for a plastic lens and can improve processing efficiency.

The processing apparatus 10 includes a base 11
It is configured by being attached to. Base 11
The substrate 11a is provided horizontally, and the substrate 11a
Above are provided a lens holding unit 12, a cutter rotation mechanism section 13 for cutting the peripheral surface of the lens, and an end mill rotation mechanism section 14 for performing groove processing and chamfering. These are laid out in substantially the same plane on the substrate 11a, the cutter rotation mechanism 13 and the end mill rotation mechanism 14 are both arranged on the front side of the apparatus, and the lens holding unit 12 is arranged on the apparatus rear side. ing.

A measurement unit 15 is provided on the substrate 11a. The measuring unit 15 has a measuring head 16 as a lens shape measuring means. The measuring unit 16 has a cutter rotating mechanism 1 for avoiding interference between the cutter rotating mechanism 13 and the end mill rotating mechanism 14.
3 and an empty space above the end mill rotation mechanism 14.

The lens holding unit 12 holds the lens 1 to be processed and rotates the lens 1 around the center of the lens in order to move the processing position in the circumferential direction of the lens. The cutter rotation mechanism section 13 has a cutter 131 for forcibly cutting the periphery of the lens 1 to be processed. By rotating the cutter 131 about a horizontal axis, flat cutting of the peripheral surface of the lens 1 to be processed is performed. The bevel cutting is performed. The end mill rotation mechanism 14 is a ball end mill (hereinafter simply referred to as “end mill”) as a processing tool.
141, and by rotating the end mill 141 about a horizontal axis, a groove is formed on the peripheral surface of the lens 1 (this groove is used to pass a thread such as nylon when a lens is mounted on a rimless frame). ), Or chamfering the intersection edge portion between the peripheral surface of the lens 1 to be processed and the lens surface.

The measuring unit 15 has a measuring head 16 for measuring the edge thickness of the lens 1 and the lens position in the edge thickness direction. The measuring head 16 can be turned up and down as necessary. It is.

The lens holding unit 12 is provided so as to be slidable in a direction parallel to the surface of the substrate 11a and perpendicular to the axis of the cutter 131 (hereinafter referred to as the Y-axis direction) by a mechanism described later, and is provided on the surface of the substrate 11a. And is slidable in a direction parallel to the axis of the cutter 131 (hereinafter referred to as a Z-axis direction).

The cutter rotating mechanism 13 is fixed on the substrate 11a. The cutter 131 of the cutter rotating mechanism 13
Is attached to a spindle 132, and the rotation of a cutter rotation motor 133 is
By transmitting it to 2, it can be rotated around its own axis.

The substrate 11a is provided with a cutting operation mechanism 24. The cutting operation mechanism unit (corresponding to a processing operation mechanism unit) 24 is a mechanism that moves the lens holding unit 12 in the Y-axis direction and performs a cutting operation on the lens 1 with respect to the cutter 131 and the ball end mill 141.

Below the substrate 11a, a duct (not shown) that constitutes a processing powder suction and removal means is arranged, and the duct is connected to a cleaning port 993 opened in the substrate 11a. Above the cleaning port 993, a plurality of air injection nozzles 992 as air injection means are arranged. These air injection nozzles 992 are disposed near the cutter 131 and near the end mill 141, and perform peripheral surface cutting, groove engraving or chamfering on the lens 1 to be processed mounted on the lens holding unit 12. The processing powder that has been blown is blown off by the air jet nozzle 992, and the blown-out processing powder is sucked and removed from the cleaning port 993.

Each mechanism of the lens processing apparatus 10 includes a substrate 1
It is electrically controlled by a control device (not shown) provided below or below 1a.

On the substrate 11a of the base 11, a Y table 20 which moves in the Y-axis direction is provided. The Y table 20 is slidably provided on two parallel rails 21 fixed to the substrate 11a so as to face the Y-axis direction, and is connected to the above-described cutting operation mechanism 24. The cutting operation mechanism 24 controls the movement in the Y-axis direction.

On the upper surface of the Y table 20, two rails 31, 31 are fixed so as to face in the Z-axis direction. A Z table 30 is slidably provided on these rails 31. The Z table 30 is the Y table 20
The movement is controlled by a Z-table moving mechanism (axial moving mechanism for moving the lens in the axial direction) 33 fixed thereon. The Z-table moving mechanism 33 is provided with a Z-axis motor 331. Z-axis motor 331
A ball screw 332 is connected to the rotating shaft of the, and a slide block 333 fixed to the Z table 30 is screwed to the ball screw 332. The Z-axis motor 331 rotates in both forward and reverse directions according to a command from a control device described later.

The rotation of the Z-axis motor 331 causes the ball screw 332 to rotate. Then, the slide block 333 is moved by the rotation of the ball screw 332, and the Z table 30 is integrated with the slide block 333.
Moves along the rails 31, 31. Z table 3
The lens holding unit 12 is fixed to the upper surface of the lens 0.

FIG. 4 is a plan view showing the detailed structure of the lens holding unit 12. As shown in FIG. The lens holding unit 12 has a lens holding shaft 121 parallel to the axis of the cutter 131 (see FIG. 2).
have. The lens holding shaft 121 is rotated by a rotation mechanism in the lens holding unit 12. A lens holder receiver 121a is provided at the tip of the lens holding shaft 121.
Is fixed, and a lens holder 19 to which the lens 1 to be processed is fixed is detachably attached to the lens holder receiver 121a.

In the lens holding unit 12, a lens holding shaft (also referred to as a lens holding shaft) 122 is slidable in the direction of the lens holding shaft 121 via an arm portion 122b coaxially with the lens holding shaft 121. Installed. The lens holding shaft 122 is connected to the air cylinder 1
The lens 1 is moved to the lens 1 side under the pressure of 23, the lens 1 is pressed by the lens holder 122 a at the tip thereof, and the lens 1 is sandwiched and held between the lens 1 and the lens holding shaft 121.

In this case, the convex lens surface 1A of the lens 1 is adhered to the end surface (formed in a concave shape) of the lens holder 19 via a double-sided adhesive pad 191. 1 is pressed against the concave side lens surface 1B. Further, the lens press 122a is attached to the tip of the lens press shaft 122 so as to be swingable in all directions, so that the lens press 122a is pressed against the concave lens surface 1B of the lens 1 in a well-balanced manner without a single contact.

The air cylinder 123 provided in the case 12a of the lens holding unit 12 moves its rod 123a in the Z-axis direction by the pressure of air sent from an air pump (not shown) provided outside. . At the end of the rod 123a, an arm 123b
Are fixed and provided so as to move integrally with the rod 123a. The arm 123b includes an arm portion 122 of the guide table 123c and the lens holding shaft 122.
b is fixed. The lens pressing shaft 122 is provided so as to be movable along an elongated hole 12b formed in the case 12a and extending in the Z-axis direction. Lens holding shaft 1
A lens holder 122a is provided at the tip of the lens 22 such that the lens holder 122a can freely rotate forward and backward around the Z axis.

The guide table 123c is mounted on the rail base 12
4 is slidably fitted to a rail 124a provided so as to be parallel to the Z-axis direction on the side surface of the rail 4. Thus, when the rod 123a of the air cylinder 123 moves, the arm 123b, the guide table 123c,
The lens pressing shaft 122 moves in the Z-axis direction, and the lens pressing 122a comes into pressure contact with the lens 1 or separates from the lens 1.

A lens rotation motor 125 is provided in the case 12a. A small-diameter gear 125c is connected to a shaft 125a of the lens rotation motor 125 via a coupling 125b. This gear 1
25c is connected to a large-diameter gear 125d. Further, a pulley 125e is provided coaxially with the gear 125d, and the pulley 125e is connected to a pulley 121b fixed on the shaft 121 via a belt 125f.

Thus, when the lens rotation motor 125 is driven, the rotation of the shaft 125 a
b, transmitted to the gear 125c, and further reduced by the gear 125d. The reduced rotation is transmitted to the lens holding shaft 12 via the pulley 125e, the belt 125f, and the pulley 121b.
1 and the lens 1 rotates.

A slit plate 121c is fixed to the lens holding shaft 121, and the rotational position of the slit plate 121c is adjusted by the optical sensor 12 fixed in the case 12a.
6, the origin position of the lens 1 held on the lens holding shaft 121 is detected.

The lens holding unit 12 having such a configuration
Then, when the lens 1 is fixed to the lens holder receiver 121a, the air cylinder 123 is driven, and the lens pressing shaft 122 moves to the left in the drawing. The lens 1 is fixed by pressing the lens 1 with the lens holder 122a. During processing of the lens 1 and measurement of the lens, the lens rotation motor 125 is driven, and the lens holding shaft 121 is rotated, whereby the lens 1 is rotated. The rotation of the lens 1 causes the lens holder 12 to rotate.
2a also rotates together.

FIG. 5A is a plan view showing a schematic configuration of the cutting operation mechanism 24 as a Y-axis direction moving mechanism.
(B) is a view on arrow Vb-Vb of (a). The cutting operation mechanism 24 is fixed to the upper surface of the concave portion of the concave member 68 attached to the lower surface of the opening of the substrate 11a. Concave member 6
8, two bearing support members 6 are spaced apart from each other.
1, 61 are provided, and a ball screw 62 oriented in the Y-axis direction is rotatably attached to these support members 61, 61. One end of the ball screw 62 is connected to a shaft of a cutting motor 63 fixed to the concave member 68.

The cutting motor 63 rotates in both forward and reverse directions in accordance with a command from a control device described later, and the ball screw 62 rotates in conjunction with the rotation of the cutting motor 63. A moving block 64 is screwed to the ball screw 62, and the moving block 64 is connected to the Y table 20 described above. Therefore, the Y table 20 and the lens holding unit 12 move in the Y-axis direction integrally with the moving block 64 of the cutting operation mechanism 24. Thereby, the cutting operation of the lens 1 into the cutter 131 is performed.

The switch block 641 is attached to the moving block 64. The switch piece 641 turns on the optical sensor 642 fixed to the concave member 68 when the moving block 64 is at the origin position serving as a reference for measuring the cutting depth. When the moving block 64 is at one of the limit positions, the optical sensor 643 fixed to the concave member 68 is turned on. When the moving block 64 is at the other limit position, the optical sensor 644 fixed to the concave member 68 is turned on.

Next, the end mill rotating mechanism 14 will be described. The end mill rotation mechanism 14 is disposed adjacent to the cutter 131 of the cutter rotation mechanism 13, and the axis of the end mill 141 is placed on the substrate 11 a by the lens holding shaft 121 and the lens holding shaft of the lens holding unit 12. It is fixed in a direction perpendicular to the direction 122 and in a direction parallel to the substrate 11a. In addition, the axis of the end mill 141, the axis of the cutter 131, and the axes of the lens holding shaft 121 and the lens pressing shaft 122 are located at the same height.
The end mill rotation mechanism section 14 is provided with a spindle motor 142 that drives the end mill 141 to rotate.

Next, the measuring unit 15 will be described with reference to FIGS. The measurement unit 15 has a measurement head 16 provided with a pair of styluses 161, 162. As shown in FIG. 8, the measuring head 16 is
Two support walls 151, 151 erected at an interval above
Is mounted via a turning shaft 152. The turning shaft 152 is disposed in parallel with the axis of the cutter 131, and is supported at a height near the upper ends of the support walls 151 and 151 so as to be rotatable in the vertical direction. Two arms 163 and 163 projecting below the measuring head 16 are provided on the turning shaft 152.
Is fixed, and by rotating the turning shaft 152, the measuring head 16 is moved to the unloading position shown in FIGS. 6A and 7A (a retracted position when not used for measurement).
And a load position (a position used for measurement) shown in FIGS. 6B and 7B.

The pivot shaft 152 has a support wall 151 having one end at one end.
From the substrate 11, and the projecting end is
a on a rotating shaft 155a of an air-driven measuring head rotating actuator 155 fixed on a
They are connected via a coupling 152a. Since the measurement head 16 is moved to the unload position and the load position by the air-driven rotary actuator 155, the measurement head 1 is moved to the unload position and the load position.
Stoppers 156 and 157 are provided so as to securely stop 6 (see FIG. 6). Stoppers 156, 157
Are provided on members on the non-swirl side, that is, brackets 156a and 157a fixed to the support wall 151. When a specific portion of the measurement head 16 hits these stoppers 156 and 157, the measurement head 16 is positioned. Is being done.

The stopper 156 at the unload position does not need to exhibit a particularly accurate positioning function.
Because it affects measurement accuracy, it is necessary to exhibit a very accurate positioning function. Therefore, as the load-side stopper 157, a micro head (1/1000 mm) that can accurately adjust the positioning position is used. By positioning with the micro head type stopper 157, the styluses 161 and 162 of the measuring head 16 moved to the loading position are at the same height level as the rotation center of the lens holding shaft 121 and the rotation center of the cutter 131. Precisely retained.

Further, when the measuring head 16 is moved to the unloading position or the loading position by the rotary actuator 155, a shock may occur if a specific portion of the measuring head 16 collides with the stoppers 156, 157. The brackets 156a fixed to the arm 163 and the support wall 151 are provided with shock absorbers (shock absorbers) 158 and 159 that perform a shock absorbing action. Immediately before the measuring head 16 hits the stoppers 156 and 157, these shock absorbers 158 and 159 come into contact with a mating member to exert a buffering action, and
It serves to soften the contact of the measuring head 16 with 57.

When the measuring head 16 is moved to the loading position, it is necessary to confirm that the measuring head 16 has fallen to the loading position. Therefore, as shown in FIGS. , An optical sensor 160 is provided on a bracket 160 a fixed to the support wall 151 to detect the presence or absence of the measuring head 16.

As described above, the measuring head 16 is configured to be pivotable between the loading position and the unloading position, so that the measuring head 16 is supplied from above to a position to be measured (loading position) when necessary, and is unnecessary. Sometimes, it is possible to retreat to an upper retreat position (unload position). Therefore, since the measuring head 16 is mounted so as not to hinder the work by the cutter 131 and the end mill 141, once the lens 1 is held by the lens holding unit 12, the chucking is not released from the measurement to the processing without releasing the chucking. Work can proceed with one chuck. Also, as a special case, when performing the measurement as needed during the processing of the lens 1, without releasing the chucking of the lens 1, holding the lens 1 as it is, the edge thickness of the lens 1, etc. Can be measured.

The specific configuration of the measuring head 16 will be described. As shown in FIG. 2 and FIG. 7A, the measuring head 16 has a convex lens of the lens 1 to be processed held by the lens holding unit 12. A pair of styluses (probes) 161 and 162 that are in contact with the surface and the concave lens surface are provided.
The pair of styluses 161 and 162 are located on a straight line parallel to the lens thickness direction (the direction parallel to the rotation axis 152), and are arranged with their spherical tips facing each other.

FIG. 9 is a diagram showing the principle configuration of the measuring head 17. Each of the styluses 161 and 162 is moved by a guide mechanism (not shown).
4, 165. Stylus 161
(The other stylus 162 has the same configuration) as shown in FIG.
As shown in detail in (b) and (c), a structure in which a true spherical steel ball (a steel ball of about 2φ made of super steel, which is resistant to wear and shape deformation) 161b is attached to the tip of a rod-shaped stylus main body 161a. belongs to. Stylus body 161a
A flat surface is formed on the side surface of the steel ball 1
The stylus body 161 moves toward the flat surface side.
It is mounted by welding eccentrically to a.

In this case, it is first conceivable to attach a steel ball to the center of the stylus main body. However, in that case, there is a great possibility that the steel ball will be attached to a position deviating from the center due to an installation error or a processing error. It is difficult to correct coordinate shift. In this regard, as described above, the flat surface is formed on the side surface of the stylus main body 161a, and the steel ball 1 is formed so that the outer periphery of the steel ball 161b contacts the extended surface of the flat surface.
61b, the steel ball 16
The center position of 1b is located at a distance of the radius of the steel ball 161b from the flat surface of the stylus body 161a. Therefore, exactly steel ball 1
The coordinates of the center position of 61b can be grasped, and this can be reflected in the measurement.

The arms 164 and 165 to which the styluses 161 and 162 are mounted are moved in parallel so as to open or close each other. Arm 16
4, 165 are springs (compression springs in the illustrated example) 166a,
The linear encoders 166, 167 having the built-in 167a are connected to the movers 166b, 167b of the linear encoders 167, 167.
a and 167a urge each other in the closing direction. The linear encoders 166 and 167
The linear encoders 166 and 167 electrically detect the movement positions of the stylus 16 and the stylus 16.
1,162 positions are detected.

As described above, the styluses 161 and 162
Is automatically biased in the closing direction by the springs 166a and 167a, but must be moved in the opening direction by some drive mechanism. Therefore, a pair of pulleys 171 and 17 are provided above the arms 164 and 165.
2, a pulley 171 is rotated by a stylus opening / closing DC motor 170 to rotate the belt 173 around, and thereby the belt 1 is rotated.
73, the arm 16 is engaged with the engagement pieces 173a and 173b.
4,165 is hooked and moved in the opening direction.

In this case as well, the optical sensors 174, 17
By detecting the position of the engagement piece 173a at 5, it is possible to detect whether the stylus 161 or 162 is open or closed. Also, the optical sensors 176, 1
77 makes it possible to detect whether each of the arms 164 and 165 is at the origin position.

FIGS. 10 and 11 show the principle of measuring the lens position using the styluses 161 and 162 of the measuring head 16. The styluses 161 and 162 are attached to the lens holding shaft 121.
And on the same straight line parallel to. Here, when the belt 173 of FIG. 9 is driven to move the lens 1 between the tips of the styluses 161 and 162 while the styluses 161 and 162 are opened and the belt 173 is returned to the opposite side, the linear encoder 166 is moved. , 167a and 167
By the action of a, the styluses 161 and 162 are closed, and FIG.
As shown in FIG. 0, one stylus 161 has its tip abutting on the convex side lens surface 1A of the lens 1 and the other stylus 1
Reference numeral 62 designates the tip of the lens 1 in contact with the concave lens surface 1B.

Now, lens frame shape data (= shape data)
When the movement of the lens 1 is controlled based on, the styluses 161 and 162 trace the trajectory S along the shape data, as shown in FIG.

For example, radial information (ρi,
θi) is given, by controlling the cutting operation mechanism 24 by an amount based on the radial length ρi,
Move in the lens radial direction with respect to the styluses 161 and 162, and the styluses 161 and 162
21 from the center axis line. Also, by controlling the lens rotation mechanism of the lens holding unit 12 by an amount based on the radial angle θi,
Is rotated by the radial angle θi with respect to the styluses 161 and 162. Since the tips of the styluses 161 and 162 trace on the convex lens surface 1A and the concave lens surface 1B of the lens 1, the moving amounts of the styluses 161 and 162 are detected by the linear encoders 166 and 167, so that the radial information is obtained. , Lens position data (Zi) in the edge thickness direction (Z-axis direction) can be obtained. By executing this detection operation for all the radial information (ρi, θi), the position data of the convex lens surface 1A and the concave lens surface 1B on the lens radial shape locus (ρi, θi) are obtained.
Can be obtained (ρi, θi, Zi).
Then, the lens thickness (edge thickness) on the lens radial shape locus (ρi, θi) can be calculated from the position data of the convex lens surface 1A and the position data of the concave lens surface 1B.

Next, the cutter 131 of the cutter rotating mechanism 13
Will be described. FIG. 12 shows the configuration of the cutter 131. As shown in FIG. 12B, the cutter 131 has two cutting blades 131a protruding from the outer peripheral surface, and the cutting blades 131a are provided at 180-degree intervals in the circumferential direction. . As shown in FIG. 12A, the cutter 131 has a small bevel cutter Y1 having a small bevel groove Y1a.
Three cutters, a large bevel cutter Y2 having a large bevel groove Y2a (for example, for a plastic cell frame) and a planing cutter H1 without a bevel groove (for example, for a frame without a frame). Are arranged on the same axis and are integrally connected, so that each cutter portion can be used properly according to a processing item.

The bevel grooves Y1a and Y2a are as shown in FIG.
It is shown as follows. The bevel angle is, for example, 110 to
125 °, the bevel height is, for example, 0.1 in the case of a small bevel.
4 to 0.68 mm, for a large bevel, for example, 0.7 to
0.9 mm. Also, bevel grooves Y1a, Y2
The flat portion adjacent to “a” has a tapered surface of, for example, 3.5 to 5 degrees only on one side. This is to create an escape for the frame next to the bevel.

FIG. 13 shows the principle of cutting the periphery of the lens 1 by the cutter 131. When viewed from the interference portion between the cutter 131 and the lens 1, the cutter 131 rotates from top to bottom, and the lens 1 rotates from bottom to top. Then, cutter 1
The 31 cutting blades 131a forcibly cut the lens 1 by the set cutting amount. Now, a machining program is created based on the lens frame shape data (= shape data), and when the movement of the lens 1 is controlled according to the machining program, the cutter 131 cuts the peripheral surface of the lens 1 according to the movement of the lens 1. Go.

In the case of planing, the lens 1 is positioned at an appropriate position in front of the planing cutter H1, and the cutting operation mechanism 24 is driven while rotating the cutter 131 to perform processing. In the case of beveling, FIG.
As shown in FIG. 4, the lens 1 is positioned at an appropriate position in front of the bevel cutters Y1, Y2, and the Z table moving mechanism 3
The cutting is performed by driving the cutting operation mechanism 24 while rotating the cutter 131 in accordance with the movement of the cutter 131 in the Z-axis direction. In the figure, 1a indicates a bevel.

FIGS. 15, 16, 17 (a), (b)
The principle of grooving by the end mill 141 and chamfering of both edges of the edge (lens peripheral surface) are shown below. When the groove 1b is carved in the end surface (peripheral surface) of the lens 1 whose shape has been processed, the movement of the lens 1 is controlled so that the lens end surface approaches the tip of the rotating end mill 141 as shown in FIGS. I do.

When the approach is completed, the cutting amount is appropriately set by the cutting operation mechanism 24 while rotating the lens 1. Then, as the lens 1 rotates, a groove 1b having a preset depth (cut amount) is continuously formed on the lens end face. During processing, the distance between the end face position where the end mill 141 is currently in contact and the center of the lens is calculated based on the shape data of the lens 1, and the position of the lens 1 in the Y-axis direction is moved and controlled according to this distance. .
Also, during processing, based on the shape data, a specific position of the end face, for example, the center position in the width direction (edge thickness direction) of the end face,
Alternatively, the movement of the lens 1 in the Z-axis direction is controlled such that the end of the end mill 141 is always located at a position at a fixed distance from the front surface of the lens (convex side lens surface 1A).

By continuing such control and rotating the lens 1 once, a groove 1b is formed on the lens end surface over the entire circumference of the lens. When the end mill 141 returns to the original starting point, the end mill 141 moves in the direction opposite to the approaching direction and separates from the lens 1.

In the case where the edges of both ends of the edge (the intersection edge between the lens peripheral surface and the lens surface) are subjected to thread chamfering to prevent cracking or chipping, as shown in FIG. Use the R part. FIG. 3A shows a case where chamfering is performed on a lens having a groove 1b formed on a peripheral surface thereof.
FIG. 4B shows a case where chamfering is performed on a lens whose peripheral surface is processed with a bevel 1a. The edge 1c on the convex side or the edge 1d on the concave side is
When dropping at the end of the end mill 141, the shoulder of the end R of the end mill 141 is used.

At this time, using the position coordinate data of the edge portions 1c and 1d, the lens 1 with respect to the end mill 141 is used.
Position (for chamfering). That is, the chamfer dimensions (ΔZ, ΔY) are determined by the shapes of the edge portions 1c and 1d.
Is determined, the center position of the end mill 141 for chamfering, the radius of the R portion, and the position data of the edge portions 1c and 1d are included in the calculation, so that the edge portion 1c of the lens 1 is obtained.
The allowances Q11, Q12, Q21, and Q22, which are the mutual positional relationship between 1d and the end of the end mill 141, are determined.
Therefore, the position coordinate data of the edges 1c and 1d of the lens 1 to be controlled can be determined from the coordinates of the center of the end mill 141 and the data of the allowances Q11, Q12, Q21 and Q22. The position of the lens 1 and the end mill 141 for proper chamfering are determined by controlling the position of the lens 1 in the Y-axis direction and the Z-axis direction and rotating the lens 1 based on the above. That is, by moving the lens 1 in the Y-axis direction and the Z-axis direction and making it rotate, the edge portion 1 to be processed is formed.
c and 1d can be accurately positioned with respect to the tip R of the end mill 141 that is rotationally driven at a fixed position. This is possible because the shape and position information of the end mill 141 and the position information of the lens 1 are accurately grasped. Note that the chamfering on the convex side and the chamfering on the concave side are performed independently, including the approach of the lens 1 to the end mill 141.

FIG. 18 shows the structure of the lens holder 19 used in the processing apparatus 10. FIG. 18 (a)
As shown in FIG. 4, the lens holder 19 is configured such that the fitting shaft portion 1 fitted on the inner periphery of the cylindrical lens holder receiver 121a shown in FIG.
93, a fitting shaft portion flange 194 that contacts the end surface of the lens holder receiver 121a, and as shown in FIG.
Is a pipe-shaped member having a lens holding flange 196 pressed against the convex side lens surface 1A via a double-sided adhesive pad 191. The fitting shaft portion flange 194 is formed with a rotation preventing notch 195 that fits into a projection (not shown) on the lens holder receiver 121a side.

The annular end surface of the lens holding flange 196 is a lens holding surface 197, which is formed in a concave spherical shape corresponding to the convex lens surface 1A of the lens 1. FIG.
As shown in (b), fine concaves and convexes 198 are formed radially in the circumferential direction on the lens holding surface 197 formed of the concave spherical surface to increase the tight bonding force with the double-sided adhesive pad 191. Each of the peaks and valleys extends as a ridge and a valley at a substantially constant angle in the radial direction of the annular lens holding surface 197.

FIGS. 18C and 18D show the cross-sectional shape of the fine unevenness 198 formed on the lens holding surface 197 of the lens holder 19 and the state in which the pad 191 is brought into close contact with the fine unevenness 198, respectively. FIG. 18 (e),
(F) is a diagram showing, as a comparative example, a cross-sectional shape of the fine unevenness 199 in the conventional lens holder and a state in which the pad 191 is adhered to the fine unevenness 199, respectively. Each of them has a cross-sectional shape in which peaks of minute irregularities 198 and 199 are continuous in the circumferential direction of the lens holding surface 197.

In the conventional lens holder, FIG.
As shown in (f), the cross-sectional shape of the fine unevenness 199 is made into a single slope shape in consideration of the rotation direction, and the pad 19 generated by rotation is formed.
Due to the biting effect on the pad 1, the bonding force with the pad 191 is maintained. That is, the wall surface 199 on the front side in the rotation direction is located at the vertex 199a of the mountain of the minute unevenness 199.
b was composed of a vertical surface, and the opposite wall surface 199c was composed of a slope.

However, such a single-slope microscopic unevenness 1
When 99 is formed on the lens holding surface 197, the pad 19
Although the binding force with the pad 191 can be obtained by the biting action on the pad 191, as shown in FIG.
Therefore, there is a problem that a high lens holding power cannot always be exerted because the degree of adhesion to the lens is low. In addition, since the pad 191 has a single-slope shape, when a pressure contact force is applied between the pad 191 and the pad 191, the pad 191 exerts an unbalanced rotational force when the pad is thick, and the pad 191 is slightly shifted in the rotational direction. Therefore, there is a possibility that high-precision lens holding may be affected.

On the other hand, the present lens holder 19 (20
In (φ), a thick adhesive pad is used, and the sectional shape of the unevenness 198 of the lens holding surface 197 is changed as shown in FIG.
As shown in (c) and (d), it is formed in both slopes.
That is, the wall surface 198b on the front side in the rotation direction and the wall surface 198c on the opposite side are formed by slopes having the same inclination angle (45 degrees) with the peak 198a of the mountain of the unevenness 198 as a boundary.

Therefore, as shown in FIG. 18 (d), when the pad 191 is pressed against the minute unevenness 198, the pad 191 is evenly brought into close contact with both slopes, and the contact area is increased. The moderate flexibility and deformability of 191 can be utilized to increase the lens holding force. In addition, since the pad 191 is uniformly pressed against the two inclined surfaces having the same inclination angle, the unbalanced rotational force is canceled out and the pad 191 is not generated, so that the pad 191 is rotationally shifted and the lens holding accuracy is reduced. Is also gone.

Further, since the lens holding force can be increased, the diameter of the lens holding flange 196 can be reduced. This has the advantages described below.

First, processing of a lens having a small diameter becomes possible. In addition, the number of types of lens holders prepared according to the lens curve can be reduced (weakness and strength, or only one or two types can be added between them). That is, generally, a plurality of types of lens holders 19 are prepared in which the curvature of the lens holding surface 197 is changed stepwise so that the lens holder 19 can be properly used according to the lens curve. In that case, it is not practical to prepare a lens holder according to all the lens curves, so that one type of lens holder requires several types of lens curves (for weakness, strength, or intermediate power). I try to cover the range.

FIG. 19 shows a lens holding surface 197 having a certain curvature.
And the relationship between the lens surface 1A. Lens holding surface 1
When the curvature of the lens surface 1A is larger than the curvature of 97, the outer peripheral edge of the lens holding surface 197 hits the lens surface 1A, and a difference F in the depth between the curve of the lens holding surface 197 and the curve of the lens surface 1A is formed. If the difference F in the depth is large, the degree of adhesion between the lens holding surface 197 and the lens surface 1A is low. Therefore, a lens holder corresponding to the lens surface 1A is prepared and selected so that the difference does not increase. ing.

However, even in the case of the same curve, if the outer diameter of the lens holding surface 197 (lens holding flange 196) is reduced, the above-described depth difference F can be reduced, and the lens having many curves can be obtained. Will be able to respond. Therefore, according to the lens holder having a reduced diameter, the range of the lens curve that can be covered can be expanded, and as a result, the types of lens holders can be reduced.

In the above example, the lens holding surface 197
Although the cross-sectional shape of the minute unevenness 198 formed in the shape of the peak is a mountain shape, the peak of the mountain or the bottom of the valley may be rounded to form a smooth wave shape. In the above example, the peaks and valleys of the minute unevenness 198 are continuously extended in the radial direction of the annular lens holding surface 197, but the minute unevenness may be dispersedly arranged on the entire lens holding surface 197. .

FIG. 20 is a block diagram showing an electrical connection relationship centering on the control device in the lens processing apparatus 10. However, only the main configuration is shown here. The control device includes a servo motor control unit 1001 and an I / O control unit 1
002. The two control units 1001 and 1002 exchange data with each other, and also exchange data with a host computer (not shown). From the host computer that manages the entire processing system, lens shape data (including radial information, lens thickness, outer diameter, and the like) and processing information are transmitted. The control units 1001 and 1002 transmit the transmitted shape data. And performs necessary processing on the lens based on the processing information.

The servo motor control unit 1001 controls the driving of the X-axis servo motor (lens rotating motor 125), Y-axis servo motor (cutting motor 63), and Z-axis servo motor (Z-direction moving motor 331). Do. Also, the I / O control unit 1002 includes a cutter rotation motor (TOOL motor) 133 of the cutter rotation mechanism unit 13, a chamfering motor (spindle motor 142 of the end mill rotation mechanism unit 14), a lens chuck air cylinder 123, and a measurement head. The rotation actuator 155, the cooling air blow 1010, and the stylus opening / closing DC motor 170 are drive-controlled via a control unit and electromagnetic valves 1021 to 1026,
Perform necessary actions. At that time, signals from various sensors are used for control.

The I / O control unit 1002 counts the detection signals of the measurement linear encoders 166 and 167 by the counter unit 1030 and takes in the signals. Further, necessary display is performed on the display operation unit 1100, and an operation signal is captured. It also sends necessary signals to the dust collector interface and the transfer robot interface.

Next, the flow of control performed by the control units 1001 and 1002 will be described with reference to the flowchart of FIG. When the lens 1 to be processed is set in the lens holding unit 12 and a start operation is performed, first, measurement trajectory data sent from the host computer is input (step S1). Next, the measuring head 16 is lowered to position it at the load position (step S2), and the stylus 1
61 and 162 are loaded onto the lens 1 (step S3), and the lens positions are measured (step S4).
The measurement data is sent to the host computer (step S5).

When the measurement is completed for the entire circumference of the lens,
The styluses 161 and 162 are unloaded from the lens 1 (Step S6), and the measuring head 16 is raised to the unload position (Step S7). Next, processing locus data is input from the host computer (step S).
8) While rotating the motor (TOOL motor) 133 of the cutter rotation mechanism 13, start air blowing (step S 9), and operate the dust collector (step S 1).
0).

Then, rough cutting is performed by forcible cutting by rotating the cutter 131 at a predetermined number of revolutions (step S1).
1) Next, the rotation speed of the cutter motor 133 is changed (step S12), and the
1 (step S13). At this time, if beveling is necessary, bevel cutters Y1, Y
2 is selected and processed.

When the finishing process is completed, the cutter 131 is stopped (step S14), the chamfering motor 142 is rotated (step S15), and the end mill 141 chamfers the edges of the convex lens surface and the concave lens surface. (Step S17). Before that, if groove engraving on the lens peripheral surface is required instead of beveling, prior to chamfering, the end mill 141 is rotated by the chamfering motor 142 to execute groove engraving on the lens end surface (step). S16). When the chamfering is completed over the entire circumference, the chamfering motor 142 and the air blow are stopped (step S18), and the dust collector is also stopped (step S1).
9) Processing of one lens is completed.

The above roughing and finishing are performed with the same cutter. That is, in the case of planing, the planing cutter H1 is selected, in the case of a small bevel, the small bevel cutter Y1 is selected, and in the case of a large bevel, the large bevel cutter Y2 is selected. Therefore, continuous processing can be performed with one chuck without performing the process movement, and the processing time can be reduced and the apparatus can be downsized. Further, since it is not necessary to separately prepare tools for roughing and finishing, the space for arranging the tools can be reduced, and the management of the tools becomes easier.

Further, since the lens 1 is forcibly cut by the cutter 131, the cutting can be advanced while appropriately setting the cut amount. Therefore, the process leading to the finished shape can be determined under the optimum processing conditions for the shape data. For example, it is possible to arbitrarily set a target such as how many rotations to complete the cutting or how many seconds to complete the cutting, so that the processing time can be reduced and the processing accuracy can be improved.

Further, since the chamfering is performed at the R portion (R) at the tip of the small-diameter end mill 141 for grooving, there is less interference with other portions as compared with a grindstone, and a small chamfer can be accurately finished. Can be. In particular, since one end mill 141 is used for both grooving and chamfering, the number of tools can be reduced, which can contribute to cost reduction. In addition, the grooving and chamfering can be performed with one chuck. Since it can be performed continuously, the processing time can be reduced. In addition, since only one drive system is required because the tool is shared, the size and cost of the apparatus can be reduced. In addition, since the number of tools is not increased, the management of tools becomes easy.

In the case of the present lens processing apparatus 10, a measuring head 16 for performing lens measurement is disposed above a cutter 131 and an end mill 141 as processing means, and the measuring head 16 is tilted forward only when necessary. Since the measurement of the lens 1 held by the lens holding unit 12 can be performed, the measuring head 16 can be mounted on the processing apparatus 10 without an unreasonable layout. Also,
Since the measuring head 16 is mounted on the processing device 10 by effectively utilizing the empty space above the cutter 131 and the end mill 141, the plane area of the processing device 10 does not need to be increased, and the size of the processing device 10 can be reduced. Can be planned. Also,
Since a series of steps from measurement to processing can be performed in a state where the lens is held in the lens holding unit 12, there is no need to change the lens for the movement of the process, and there is a concern that the processing accuracy may be degraded due to changing the lens. No more, the lens shape can be finished accurately.

[0085]

As described above, according to the first aspect of the present invention, since the cross-sectional shape of the minute unevenness of the lens holding surface is formed into the shape of both slopes, the adhesive pad is evenly formed on both slopes of the minute unevenness. Can be brought into close contact, the contact area can be increased, and the lens holding force can be increased. Also, since the lens holding force can be increased, the diameter of the lens holding surface can be reduced, and the types of lens holders prepared according to the lens curve can be reduced. Also,
Since the adhesive pad can be evenly pressed against the inclined surface of the minute unevenness, generation of unnecessary rotational force can be prevented, rotation deviation of the adhesive pad can be eliminated, and lens holding accuracy can be improved. Therefore, it is possible to contribute to improvement of processing accuracy.

According to the second aspect of the present invention, since the minute unevenness is formed radially around the axis of the lens holding shaft, there is no deviation in the circumferential direction and the radial direction and the accuracy is high. The lens can be held.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an overall configuration of a lens processing apparatus for performing a lens measuring method according to an embodiment of the present invention.

FIG. 2 is a plan view showing the overall configuration of the processing apparatus.

FIG. 3 is a front view showing the entire configuration of the processing apparatus.

FIG. 4 is a plan view showing a detailed configuration of a lens holding unit in the processing apparatus.

FIG. 5A is a plan view showing a detailed configuration of a cutting operation mechanism in the processing apparatus, and FIG. 5B is a plan view showing Vb- in FIG.
It is a Vb arrow view.

FIGS. 6A and 6B are side views of a measurement unit in the processing apparatus, wherein FIG. 6A shows a state where the measurement head is at an unload position, and FIG. 6B shows a state where the measurement head is at a load position.

FIG. 7 is a plan view of a measuring unit in the processing apparatus, in which (a) shows a state where the measuring head is at an unload position, and (b) shows a state where the measuring head is at a load position.

FIG. 8 is a front view of a measurement unit in the processing apparatus.

FIG. 9A is a diagram showing the principle configuration of the measuring head, and FIG.
FIG. 3 is a side view showing details of a tip portion of the stylus, and FIG.

FIG. 10 is a plan view showing a state in which a stylus of the measurement head is loaded on a lens.

FIG. 11 is a side view showing a state in which a stylus of the measurement head is loaded on a lens.

12A and 12B show a configuration of a cutter of a cutter rotation mechanism in the processing apparatus, wherein FIG. 12A is a half-sectional view, FIG.
(C) is an enlarged view of a main part of the bevel cutter.

FIG. 13 is a side view showing a state where a lens is being processed by the cutter.

FIG. 14 is a plan view showing a state where a lens is being processed by the bevel cutter.

FIG. 15 is a plan view showing a state in which a groove is formed in a lens end face and a state in which an edge of the lens end face is chamfered by an end mill of an end mill rotating mechanism in the processing apparatus.

FIG. 16 is a side view showing a state in which groove milling or chamfering is performed by the end mill.

FIG. 17 (a) is an enlarged view used to explain the case where groove cutting and chamfering are performed by the end mill, and FIG. 17 (b) is an explanatory view of chamfering when there is a bevel.

18A and 18B are explanatory views of a lens holder in the processing apparatus, wherein FIG. 18A is a side view of the lens holder, FIG. 18B is a plan view of a lens holding surface of the lens holder, and FIG. (D) is a cross-sectional view showing a state in which a pad is pressed against the fine irregularities.
(E) is a cross-sectional view of the fine unevenness formed on the lens holding surface of the conventional lens holder, and (f) is a cross-sectional view showing a state where a pad is pressed against the fine unevenness.

FIG. 19 is a cross-sectional view used to explain the degree of adhesion based on the relationship between the lens holder and the curvature of the lens.

FIG. 20 is a block diagram schematically showing an electrical configuration of the processing apparatus.

FIG. 21 is a flowchart showing a processing process performed by the processing apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lens 12 Lens holding unit 121 Lens holding axis 19 Lens holder 191 Adhesive pad 197 Lens holding surface 198 Micro unevenness

Continuation of the front page (72) Inventor Satoshi Annaka 2-7-5 Nakaochiai, Shinjuku-ku, Tokyo F-term in Hoya Corporation (reference) 2H006 DA00 3C049 AA01 AA16 AA18 AB05 AB06 AC02 BA07 BB02 BB06 BB09 CA01 CB01

Claims (2)

[Claims] 1. A lens holder mounted on a tip of a lens holding shaft for holding a lens at a center portion of a lens and pressed against a convex lens surface of the lens via an adhesive pad, wherein the lens holder is pressed against the convex lens surface. On the concave spherical lens holding surface, a large number of fine irregularities are formed to increase the tight bonding force with the adhesive pad. A lens holder characterized in that it is formed in a chevron-shaped cross section in which the wall surface of the lens is formed by an inclined surface having substantially the same angle. 2. The micro unevenness having a chevron-shaped cross section is arranged radially around an axis of the lens holding shaft as concave and convex ridges extending in a radial direction of a lens holding surface. Item 2. The lens holder according to item 1.