KR20140044414A - Lens processing device - Google Patents

Abstract

In the lens processing apparatus 1, the lens 11 is adsorbed and supported on the lens holder 12 supported at the distal end of the lens holder shaft 13 via the pivot bearing mechanism 14 so as to be rotatable and swingable. The lens surface 11a is processed by moving the lens 11 and the lens processing tool 31 relative to each other while the lens processing tool 31 is pressed. The Z-axis moving mechanism 19 and the X-axis moving mechanism 15 control the transfer of the lens holder 12 in the orthogonal Z-axis and X-axis directions so that the lens 11 is vertical including these two axes. It can be moved along any trajectory on the plane. The circular arc processing surface 31a of the lens processing tool 31 can be rotated along the circular trajectory centering on the θ axis 32 by the θ axis turning mechanism 33. Accordingly, the lens surface 11a can be processed while keeping the lens 11 pressed horizontally with respect to the circular arc processing surface 31a of the lens processing tool 31.

Description

Lens processing device {LENS PROCESSING DEVICE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a highly versatile lens processing apparatus capable of polishing, grinding, and the like on the lens surface by various processing methods.

Conventionally, processing methods of lens surfaces include Oscar-type, inclined-axis-type, spherical-oscillation-type, and planetary fluctuations. Methods such as planetary oscillation-type (遊 星 遊動 式) are known. The optimum processing method is selected from these processing methods according to the shape, material, etc. of the lens, and the lens surface is processed using a dedicated lens processing apparatus for processing by the selected processing method. Therefore, in the related art, various types of lenses have to be individually prepared with factory values, which requires a lot of installation cost or installation space, and thus has a problem of poor economic efficiency.

The present applicant, in Patent Document 1 (Japanese Patent No. 3981326), assumes that the plate-shaped and cup-shaped lens processing tool can be accurately moved along an arbitrary trajectory without using a cam mechanism. In addition, a lens is proposed that can process the lens surface by various processing methods. In this lens processing apparatus, an object to be processed which is horizontally adsorbed and supported on a lens support surface facing downward from a lens holder in a processing surface of an upwardly facing lens processing tool. The lens is machined by pressing the machining surface of the lens processing tool from the lower side. In addition, various lens processing methods are controlled by controlling the movement of the lens processing tool in the Z-axis direction (vertical direction), its X-axis direction (horizontal direction), and its pivot about the θ axis perpendicular to the Z-axis and the X-axis. The lens surface can be machined.

Japanese Patent No. 3981326

Here, in the Oscar type, bent axis type, planetary oscillation type lens processing apparatus used for conventional curved processing of a lens, the rotation axis of the lens processing tool and the lens holder axis are inclined at a predetermined angle. The lens cannot be kept horizontal. The lens follows the rotation of the lens processing tool during the processing and performs a rotational movement. A force which always tries to return to the horizontal state by the inertial force caused by the rotation acts on the lens. For this reason, the pressurized stress which arises between a lens and a lens processing tool does not become uniform, and the processing precision of a lens processing surface may fall.

In addition, when the rotation axis of the lens processing tool and the lens holder shaft are inclined, when the lens is replaced, when the lens is released from the lens processing tool by releasing the pressing force on the lens holder shaft, the lens is processed by the lens processing tool. There is a risk of being damaged by slipping off the surface.

In addition, if the inclination of the lens at the time of completion of processing is not constant, attachment and detachment of the lens by the automatic transfer device becomes difficult, and the manual lens replacement is inevitable. For this reason, work efficiency cannot be improved by automating lens replacement.

SUMMARY OF THE INVENTION In view of this point, the object of the present invention is to support a lens on a lens holder which is rotatably supported by a pivot bearing at the tip of the lens holder shaft so as to be rotatable and swingable, and the lens and the lens are pressurized by the lens processing tool. A lens processing apparatus for processing a lens curved surface by moving a processing tool relatively, wherein the lens curved surface can be processed by various processing methods while the lens is always kept horizontal.

In order to solve the above problems, the lens of the present invention,

A lens holder shaft extending in the vertical direction,

A lens that is attached to the lower end of the lens holder shaft in a coaxial state downward through a pivot bearing, and which can rotate and oscillate around the pivot bearing. With a lens holder,

A Z-axis moving mechanism for moving the lens holder axis in a vertical Z-axis direction;

An X-axis moving mechanism for moving the lens holder shaft in the horizontal X-axis direction,

A lens processing tool disposed upwards for processing the lens supported by the lens holder and having a convex or concave arc processing surface;

A θ-axis swing mechanism (θ 軸 旋回 機構) for swiveling the lens processing tool about a θ axis extending in a horizontal direction perpendicular to the X axis;

A lens processing tool rotating mechanism for rotating the lens processing tool about the center axis line of the lens processing tool passing through the θ axis;

The X-axis moving mechanism, the Z-axis moving mechanism and the θ-axis turning mechanism are driven to control the movement in the X-axis direction of the lens holder attached to the lens holder shaft, and the movement in the Z-axis direction of the lens holder. And drive control means for executing a plurality of types of lens processing modes by controlling the turning around the [theta] axis of the lens processing tool.

In the lens processing apparatus of the present invention, in the lens processing mode by the drive control means, the lens support surface of the lens holder is provided with respect to the arc-shaped processing surface of the lens processing tool that pivots about the θ axis. And a lens processing mode for driving control of the X-axis moving mechanism, the Z-axis moving mechanism and the θ-axis turning mechanism so that the supported lens to be horizontally pressed from the image side is maintained. have.

In the lens processing apparatus of the present invention, the Z-axis and the X-axis are included by the lens holder's transfer operation in the orthogonal biaxial directions (Z-axis and X-axis directions) of the lens to be processed adsorbed and supported by the lens holder. Can be moved along any trajectory on a vertical plane. Moreover, on the said vertical plane, the circular arc processing surface of a lens processing tool can be rotated along the circular trajectory centering on a (theta) axis. Therefore, the lens processing mode which processes the lens surface while maintaining the state which pressed the lens horizontally from the image side with respect to the circular arc processing surface of a lens processing tool can be implement | achieved.

In the lens processing apparatus of the present invention, it is preferable to include a Y-axis moving mechanism for moving the lens processing tool in the direction of the Y-axis parallel to the θ-axis.

The lens processing tool is positioned at an arbitrary position in the Y-axis direction by the Y-axis moving mechanism, and the lens holder is reciprocated in the X-axis direction by the X-axis moving mechanism at this position, thereby supporting the conventional Oscar system. The lens surface can be processed by the lens processing mode. In addition, the X-axis moving mechanism, the Z-axis moving mechanism, and the θ-axis turning mechanism are individually controlled, and the lens holder and the lens processing tool are moved and fixed to a predetermined position so that the lens surface can be changed by the lens processing mode corresponding to the conventional four-axis method. Can be processed.

According to the lens processing apparatus of the present invention, the lens processing can be performed by the lens processing mode in which the lens surface is processed while the lens is always kept horizontal. In this lens processing mode, the pressure stress of the lens with respect to the circular arc processing surface of the lens processing tool becomes uniform at each part of the lens surface. Moreover, when releasing the pressing force of the lens holder shaft and releasing the lens adsorbed and supported by the lens holder supported in front of it, the lens slides along the arc-shaped processing surface of the lens processing tool so as not to be damaged. In addition, since the attitude of the lens at the time of completion of processing is always in the horizontal state, it is possible to efficiently replace the lens with respect to the lens holder by using the automatic transfer device.

Moreover, since the lens factory of this invention can process by many types of lens processing modes, such as Oscar type | mold, bent axis type | mold, planetary oscillation type | mold, by this one, it is highly versatile. Therefore, various types of lenses do not need to prepare the factory individually, it is very economical because the installation cost, installation space is small.

1 is a mechanical diagram of a lens processing apparatus to which the present invention is applied.
FIG. 2 is an explanatory diagram showing a lens processing mode in which the lens by the lens processing apparatus of FIG. 1 is held horizontally; FIG.
3 is an explanatory diagram showing another lens processing mode by the lens processing apparatus of FIG.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of the lens processing apparatus to which this invention is applied with reference to drawings is described.

1 and 2, the lens processing apparatus 1 according to the present embodiment is disposed at an upper shaft unit 10 and a position immediately below the upper shaft unit 10. It is in charge of drive control of each part, and the conveyor unit 50 arrange | positioned at the height position between these lower shaft units 30, these upper shaft units 10, and the lower shaft unit 30. A drive control unit 70 is provided.

The upper shaft unit 10 supports a lens holder 12 for supporting a lens 11 to be processed in a downward direction. The lower shaft unit 30 supports the lens processing tool 31 for lens surface processing in the upward direction. The conveyor unit 50 supplies the lens 11 to be processed to the lens holder 12 and recovers the lens 11 after the processing from the lens holder 12.

The upper shaft unit 10 includes a lens holder shaft 13 arranged in the vertical direction, and a pivot bearing mechanism 14 is provided at the lower end of the lens holder shaft 13. The lens holder 12 is attached in a downwardly directed state through the " On the lens support surface 12a facing downward in the lens holder 12, the lens 11 to be processed can be adsorbed and supported by vacuum treatment, for example.

In addition, the image axis unit 10 includes an X-axis moving mechanism 15 for sending the lens holder shaft 13 in the X-axis direction extending in the horizontal direction, and the lens holder shaft 13 in the vertical direction. Z-axis moving mechanism 19 for sending in the Z-axis direction extending in the In this example, the X-axis moving mechanism 15 includes an X-axis guide 16 extending in the horizontal direction and an X-axis table that can slide in the X-axis direction along the X-axis guide 16 ( X-axis table 16a, an X-axis feed screw 17 for sending the X-axis table 16a in the X-axis direction, and an X-axis servo motor as a driving source ( 18). The Z-axis moving mechanism 19 is attached to the surface of the X-axis table 16a and is orthogonal to the X-axis and extends in the vertical direction, and the Z-axis direction along the Z-axis guide 20. Z-axis table 20a slidable, Z-axis feed screw 21 for sending Z-axis table 20a in Z-axis direction, and Z-axis servomotor 22 as a driving source.

A holder shaft base 23 is fixed to the Z-axis table 20a of the Z-axis moving mechanism, and the holder shaft base 23 is perpendicular to the state in which the lens holder shaft 13 is rotatable. Supported. The lens holder shaft 13 is always pressed downward by a holder pressing spring 24. The pressing force by the holder pressing spring 24 can be adjusted by the pressure adjusting bolt 25. The method of pressurization can also be carried out by a weight, an air pressure cylinder, a hydraulic cylinder in addition to a spring. In addition, the lens holder shaft 13 is rotated about the center axis line 13a by a holder shaft drive motor 26 mounted on the holder shaft base 23. Can be.

Moreover, as the pivot bearing mechanism 14 between the lens holder shaft 13 and the lens holder 12, various structures can be adopted, and the back of the lens holder 12 supported by the lens holder shaft 13 The oscillation may be performed around the position 12b, and may be attached in a state in which the rotation is possible around the central axis 13a. In the case where the lens 11 is sucked and supported by the vacuum suction on the lens support surface 12a of the lens holder 12, a vacuum suction path for vacuum sucking the lens 11 is provided with a lens holder shaft. (13) and pivot bearing mechanism (14) to be pulled out so as to be open to the lens support surface (12a) of the lens holder (12). It is preferable to employ a pivot bearing mechanism 14 suitable for forming such a vacuum suction path.

Next, the lower axis unit 30 rotates the lens processing tool 31 about the θ axis 32 orthogonal to both the X axis and the Z axis and extends horizontally in the front-rear direction. A turning mechanism 33 and a Y-axis moving mechanism 36 for moving the lens processing tool 31 in the horizontal direction parallel to the θ axis 32 are provided. The θ-axis swing mechanism 33 is a L-shape attached to the θ-axis servomotor 34 having a rotation shaft 34a having the θ axis 32 as a central axis, and the tip of the rotation shaft 34a. Θ bracket 35 is provided. The Y-axis moving mechanism 36 includes a spindle case 37 and a Y-axis micro head 38 that defines a position of the spindle case 37 in the Y-axis direction. have. The spindle case 37 is mounted on the θ bracket 35 in a state capable of moving in the Y-axis direction.

A spindle 39 is supported by the spindle case 37 to rotate, and the spindle 39 is rotationally driven by the spindle drive motor 40. On the upper end of the spindle 39, a lens processing tool 31 is attached upward in a coaxial state. The spindle case 37, the spindle 39, and the spindle drive motor 40 constitute a rotation mechanism 41 of the lens processing tool 31.

On the other hand, the conveyor unit 50 is provided with the conveyor 52 which conveys the lens case 51, and the conveyor drive motor 53 for rotating the conveyor 52. As shown in FIG. These conveyors 52 and conveyor drive motors 53 are positioned between the upper shaft unit 10 and the lower shaft unit 30 by a conveyor front and rear cylinder 54, and here in the Y-axis direction. You can move to an evacuated location.

An example of the lens conveyance operation by the conveyor 52 will be described. The conveyor 52 conveys the lens case 51 at the evacuation position, and finishes processing, and replaces the lens case 51 containing the lens and the lens case 51 containing the raw lens. The lens case 51 arriving at the end of 52 is transferred to the conveyor of the next step, and the lens case 51 discharged from the conveyor of the previous step is received.

After doing this, the conveyor 52 moves forward to position the lens case 51 under the upper shaft unit 10, to supply the lens 11 to the lens holder 12, or to complete the processing from the lens holder 12. The lens 11 is received and moved to the retracted position.

The upper shaft unit 10 positions the lens holder 12 directly above the lens case 51 loaded on the advanced conveyor 52, and mounts the lens of the lens case 51 on the lens holder 12, for example. It is adsorbed by vacuum treatment and evacuated once. After the lens case 51 is retracted together with the conveyor 52, the lens 11 supported by the lens holder 12 is moved to the processing position by the lens processing tool 31 of the dish type or cup type.

After the processing by the plate-shaped and cup-shaped lens processing tool 31 is finished, the lens holder 12 is used to retract the lens 11 from the lens processing tool 31, and the conveyor 52 advances to the lens. Waiting for the case 51 to be located below, the lens holder 12 is directly above the lens case 51, for example, releases the adsorption, and causes the lens 11 to fall on the lens case 51, thereby bringing it down. I receive it. After this, the lens holder 12 is evacuated.

(Operation example)

The operation example by the lens processing apparatus 1 of this structure is demonstrated. FIG. 2 is an explanatory diagram showing a lens processing mode in which processing is performed while the lens 11 is held horizontally. As the conditions for the movement, the machining radius r (m), the left movement amount L (m), and the right movement amount R (m) are set. In addition, the processing surface 31a of the lens processing tool 31 is a convex arc-shaped processing surface, and the lens so that the vertex 3lb of this processing surface 31a is located on the (theta) axis 32 The processing tool 31 is attached to the upper end of the spindle 39, and at the initial position, the center axis line 13a of the lens holder shaft 13 and the rotation center line 31c of the lens processing tool 31 coincide with each other. Shall be.

The coordinate position on the upper axis unit 10 side at the initial position indicated by the broken line in FIG. 2 is Xo (m) in the X axis direction and Zo (m) in the Z axis direction, and the lower axis unit 30 side. Let the angle of revolution be? O (degrees). In this case, the lens surface 11a and the convex arc-shaped processing of the lens 11 are pressed while the lens 11 is kept in the horizontal state and pressed to the convex arc-shaped machining surface 31a of the lens processing tool 31. In order to slide the surface 31a, the feed amount Zd in the Z-axis direction and the turn amount θd around the θ-axis along the feed amount Xd in the X-axis direction are set as follows.

X = Xd (m)

θd = sin ^-1 (Xd / r) (degrees)

Zd = r (1-cosθd) (m)

The feed amount Xd in the X-axis direction is gradually increased to move from the initial position Xo to L (m). The feeding amount Zd (m) and the turning angle θd (degrees) in the Z-axis direction according to the feeding amount Xd are calculated, and the feeding operation in the Z-axis direction and the θ-axis are synchronized with the feeding in the X-axis direction. Turn around the circumference. On the contrary, after the feed amount Xd becomes L (m), the feed amount Xd is gradually decreased to move from the initial position Xo to the negative side to R (m). Also in this case, the feed operation in the Z-axis direction and the pivoting motion around the θ axis are performed in conjunction with the feed in the X-axis direction. Thereby, the lens surface 11a can be processed while the lens 11 is kept horizontal.

In the machining operation of the lens surface, the lens machining tool 31 is rotated about the rotation center line 31c by the lens machining tool rotating mechanism 41. Since the lens surface 11a of the lens 11 is pressed from the image side to the processing surface 31a of the lens processing tool 31, the lens 11 is rotated in accordance with the rotation of the lens processing tool 31. The machining operation is performed in a state in which the lens 11 is vacuum sucked to the lens support surface 12a of the lens holder 12 or in a state in which vacuum suction is released.

Here, when the movement stroke in the Z-axis direction of the lens holder shaft 13 is larger than the maximum value of the feed amount in the Z-axis direction, the calculation of Zd and the drive control of the Z-axis moving mechanism can be omitted.

In addition, by giving a positive value to the machining radius r, as shown in Fig. 2, the convex lens surface 11a can be processed, and by providing a negative value, the lens concave surface is processed. can do.

On the other hand, when the processing radius r is infinite, only the horizontal movement (feeding in the X-axis direction) occurs, and when combined with the movement in the Y-axis direction, an Oscar-type lens processing mode can be realized. In addition, if the processing in the X-axis, Z-axis, and Y-axis directions is prevented, and the rotation around the θ axis is inhibited, and the lens 11 and the lens processing tool 31 are fixed at an arbitrary position and angle, Inclined-axis-type lens processing mode can be realized.

Further, as shown in Fig. 3, the lens processing tool 31 is fixed in a vertical state, and in this state is rotated by the lens processing tool rotating mechanism 41, and the Z axis moving mechanism 19 and the X axis moving mechanism ( It is also possible to process the lens surface 11a by driving 15) and sliding the lens 11 along the lens processing surface 31a of the lens processing tool 31.

(Other Embodiments)

In the case of a small number of workpieces (lens) or a large outer diameter, or inexpensive to construct a simple means, a turntable rotating by electric and air indexes is placed in place of the conveyor unit 50 to supply the workpiece. And recovery may be performed. Of course, the work may be detached by hand without using a work exchange device.

It is also possible to replace the Y-axis microhead 38 of the lower shaft unit 30 with a Y-axis moving mechanism composed of a feed screw and a servomotor. In this case, the lens surface processing by the planetary system can be realized by simultaneously driving the Y-axis moving mechanism and the X-axis moving mechanism.

1: Lens processing device
10: upper shaft unit
11: lens
11a: lens surface
12: lens holder
13: lens holder shaft
13a: center axis
14: pivot bearing mechanism
15: X axis moving mechanism
16: X axis guide
16a: X axis table
17: X axis feed screw
18: X axis servomotor
19: Z axis moving mechanism
20: Z axis guide
20a: Z axis table
21: Z axis feed screw
22: Z axis servomotor
23: holder shaft base
24: Holder pressure spring
25: Pressure adjusting bolt
30: lower shaft unit
31: lens processing tool
31a: machining surface
3 lb: vertex
31c: center of rotation line
32: θ axis
33: θ axis turning mechanism
34: θ axis servo motor
34a: axis of rotation
35: θ bracket
37: spindle case
38: Y axis microhead
39: spindle
40: spindle drive motor
41: lens processing mechanism rotation mechanism
50: conveyor unit
51: lens case
52: Conveyor
53: conveyor drive motor
70: drive control unit

Claims (3)

A lens holder shaft extending in the vertical direction,
A lens that is attached to the lower end of the lens holder shaft in a coaxial state downward through a pivot bearing, and which can rotate and oscillate around the pivot bearing. With a lens holder,
A Z-axis moving mechanism for moving the lens holder axis in a vertical Z-axis direction;
An X-axis moving mechanism for moving the lens holder shaft in the horizontal X-axis direction,
A lens processing tool disposed upwards for processing the lens supported by the lens holder and having a convex or concave arc processing surface;
A θ-axis swing mechanism (θ 軸 旋回 機構) for swiveling the lens processing tool about a θ axis extending in a horizontal direction perpendicular to the X axis;
A lens processing tool rotating mechanism for rotating the lens processing tool about the center axis line of the lens processing tool passing through the θ axis;
The X-axis moving mechanism, the Z-axis moving mechanism and the θ-axis turning mechanism are driven to control the movement in the X-axis direction of the lens holder attached to the lens holder shaft, and the movement in the Z-axis direction of the lens holder. And drive control means for executing a plurality of types of lens processing modes by controlling the turning around the [theta] axis of the lens processing tool.
A lens processing apparatus, comprising: a lens processing apparatus.
The method of claim 1,
In the lens processing mode by the drive control means, the lens to be processed supported by the lens support surface of the lens holder is horizontal from the upper side with respect to the arc-shaped processing surface of the lens processing tool that pivots about the θ axis. And a lens processing mode for driving control of the X-axis moving mechanism, the Z-axis moving mechanism, and the θ-axis turning mechanism so that the pressurized state is maintained.
3. The method of claim 2,
And a Y-axis moving mechanism for moving the lens processing tool in the direction of the Y-axis parallel to the θ-axis.

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