KR101509504B1 - Lens machining device - Google Patents

Abstract

In the moving mechanism 10 of the lens processing apparatus 1 of the present invention, the first supporting shaft 41 movable in the X-axis direction by the second driving mechanism 50 is rotatably supported on the supporting member 31 And the second support shaft 42 which is movable individually in the X axis direction by the third drive mechanism 60 is rotatable relative to the support member 31 and is moved toward the first support shaft 41 And is movably connected in the direction in which it is spaced apart. When the first and second support shafts are individually moved in the X-axis direction, the support member is pivoted about the axis parallel to the Y-axis, and the first drive mechanism (30) mounted thereon also turns, The lens mounted on the mechanism is inclined with respect to the center axis (Z-axis) of the lens holder 7 with the tool 8. The lens can move the tool along various movement trajectories by the first, second, and third drive mechanisms. Therefore, it is possible to obtain a lens processing apparatus capable of processing the lens surface with high precision by various processing methods without using a cam mechanism.

Description

[0001] LENS MACHINING DEVICE [0002]

The present invention relates to a lens processing apparatus for processing a surface of a lens.

As a method of working the surface of the lens, various methods such as an Oscar method, a biaxial axis method, a spherical core oscillation method, and a planetary oscillation method are known. Conventionally, an optimum processing method among these processing methods has been selected according to the shape and the material of the lens, and the surface of the lens has been processed by using a dedicated lens processing apparatus according to the selected processing method. Patent Literature 1 proposes a centripetal motion type machining method for machining a lens surface using an imitation cam type using a cam and a cam roller.

[Patent Document 1] Japanese Patent Application Laid-Open No. 2004-17166

Conventionally, since the optimum processing method among various processing methods is selected and the lens surface is processed by using a dedicated lens processing apparatus according to the selected processing method, various types of lens processing apparatuses are prepared individually according to the shape of the lens or the like I needed to leave. Therefore, there is a problem in that a large facility cost and a large installation space are required and the economical efficiency is deteriorated.

In addition, the conventional centripetal swiveling lens processing apparatus is a supporting point fulcrum in addition to the above-described imitative cam type. However, in the case of the supporting point knowledge, there is a limit to the curvature that can be machined by the structure. On the other hand, in the case of the imitation cam type, since it is necessary to replace the cams according to the curved surface to be machined, it takes time to prepare the machining. In addition, if a problem occurs such as rattling caused by abrasion of the cam, contamination of the cam surface, or foreign matter passing through the cam surface, the cam roller is bound, so that the lens can not maintain the track accuracy of the tool. Therefore, it is necessary to regularly inspect, maintain, and exchange cams, which requires a lot of cost and time for maintenance. In addition, since many kinds of cams must be prepared in accordance with the curved surface of the lens to be processed, a high cost is required for the equipment. In addition, since the cam being used is large and heavy, it is not easy to replace the cam. Further, at the time of cam replacement, there is a risk of falling of the cam, so a special device for cam replacement is also necessary. Further, there is also a problem that a machining error occurs depending on the attachment state of the cam, and the reproducibility of the machining accuracy is insufficient.

In both of the support point knowledge and the mimic cam type, it is necessary to adjust the position of the blade of the processing tool with high accuracy according to the curved surface of the lens to be processed. Because of this, special techniques are required for the adjustment and many adjustment times are required.

SUMMARY OF THE INVENTION The object of the present invention is to provide a lens processing apparatus and a lens processing method capable of moving a tool with high precision along an arbitrary trajectory without using a cam mechanism, Device.

In order to solve the above problems, the lens processing apparatus of the present invention is characterized by having the following configuration. Note that the reference numerals in parentheses are used for the embodiments described later, and are for the sake of easy understanding only, and are not intended to limit the present invention to the embodiments.

That is, in the lens processing apparatus 1 of the present invention,

A lens holder 7 arranged in a state in which the central axis 2a extends in a predetermined Z-axis direction,

A lens 8 for processing the lens 6 held by the lens holder 7, a tool 8,

In the state that the lens has the rotation center axis 3a of the tool 8 in a plane parallel to the center axis 2a of the lens holder 7, (10)

The moving mechanism (10)

The lens has a first driving mechanism (30) for linearly reciprocating the tool (8) in the direction of the rotation center axis (3a) of the tool (8)

A supporting member 31 for supporting the first driving mechanism 30,

A first support shaft 41 connected to the support member 31 so as to be rotatable about a first axis 41a parallel to the Y-axis orthogonal to the plane,

It is possible to reciprocate linearly in a direction in which the support member 31 approaches and separates from the first support shaft 41 at a position spaced apart from the first support shaft 41 in the Z axis direction, A second support shaft 42 connected to the support member 31 in a state of being rotatable about a second axis 42a parallel to the axis,

A second drive mechanism (50) for linearly reciprocating the first support shaft (41) in the X axis direction orthogonal to the Y axis and Z axis,

And a third drive mechanism (60) for linearly reciprocating the second support shaft (42) in the X axis direction.

In the moving mechanism of the lens processing apparatus of the present invention, the first support shaft movable in the X-axis direction by the second drive mechanism is rotatably connected to the support member, and the third support mechanism is separately The movable second support shaft is rotatably connected to the support member and movably in a direction approaching and separating from the first support shaft. Therefore, when the first support shaft and the second support shaft are individually moved in the X-axis direction, the support member thereby rotates about the axis parallel to the Y-axis, and the first drive mechanism mounted on the support member is also turned . As a result, the lens mounted on the first driving mechanism is tilted with respect to the center axis (Z-axis) of the lens holder with the rotation center axis of the tool. Therefore, by the lens, by the first driving mechanism, the lens moves the tool in the direction of the rotational center axis thereof and the lens and the operation of changing the direction of the tool by the second and third driving mechanisms cooperate with each other, It is possible to move along the movement trajectory.

For example, the moving mechanism can be used as a rocking mechanism for causing the lens to swing the tool around a point on the center axis of the lens holder, thereby realizing lens processing corresponding to the center-pivoting type. In addition, the lens surface machining can be performed by a machining method corresponding to the conventional four axes by individually controlling the first to third drive mechanisms and moving and fixing the tool to a predetermined position. Therefore, it is possible to carry out the processing according to various kinds of processing methods by a single lens processing apparatus, so that a lens processing apparatus with high versatility can be realized, and facility cost and installation space can be reduced.

In addition, in the moving mechanism of the present invention, the first to third driving mechanisms for performing the linear reciprocating motion are used to realize the rocking motion of the tool and the like. Such a drive mechanism can be constituted by a highly rigid mechanism including a linear guide, a table, and the like, so that it is possible to maintain the movement locus of the tool with high accuracy for a long time. Therefore, it is possible to solve the problem of maintaining the accuracy in the ball-and-pinion oscillating type such as the imitation cam type.

Furthermore, since the moving mechanism of the present invention does not use the cam mechanism, it is possible to solve the problem of replacing the cam and the problem of providing all the various cams.

Here, the moving mechanism of the lens processing apparatus of the present invention is characterized in that the lens has a fourth driving mechanism for linearly reciprocating the tool in the Y-axis direction, and the fourth driving mechanism is mounted on the first driving mechanism desirable. The lens processing jig is positioned at an arbitrary position in the Y-axis direction by the fourth drive mechanism, and at this position, the lens is moved by the first to third drive mechanisms on a plane parallel to the rotation center axis of the tool So that it is possible to perform any movement such as rocking motion. Therefore, it is possible to perform processing of the lens surface in accordance with the conventional machining method corresponding to the Oscar method.

According to the lens processing apparatus of the present invention, the lens for processing the lens can move the tool along various trajectories without using the cam mechanism. Therefore, since lens processing that conventionally required various kinds of lens processing apparatuses can be concentrated into one, facility investment, installation space, and idle machines can be reduced.

In addition, since the time required for machining preparation such as cam exchange can be greatly reduced, the working efficiency can be improved. Since it is not necessary to use a heavy cam mechanism, it is unnecessary to replace the cam, so that the safety of the work is enhanced. Even a worker having a weak power such as a woman can prepare the work without using a special device.

In addition, since the first to fourth drive mechanisms are linearly reciprocating mechanisms having a guide, a table, and the like having high rigidity, the lens can move the tool so that vibration does not occur. Therefore, the lens can maintain the movement locus of the tool with high accuracy for a long time, and highly reliable machining can be realized.

Hereinafter, an embodiment of a lens processing apparatus to which the present invention is applied will be described with reference to the drawings.

Fig. 1 is a perspective view showing a schematic configuration of a main part of a lens processing apparatus according to the present embodiment. The lens processing apparatus 1 includes an upper shaft unit 2, a lower shaft unit 3 disposed below the upper shaft unit 2, and a microcomputer And a control unit 4 which is composed of a plurality of control units. The upper shaft unit 2 is provided with a lens holder 7 for holding the lens 6 for surface treatment and the lower shaft unit 3 is provided with a lens holder 7 for holding the lens 6 held by the lens holder 7 The lens for carrying out the present invention is provided with the tool 8.

The upper shaft unit 2 includes a holder shaft 7a to which the lens holder 7 is detachably attached at the lower end thereof, a support sleeve 11 which rotatably supports the holder shaft 7a, And a guide rail 13 for guiding the moving block 12 in the up and down direction. The moving block 12 is moved along the guide rail 13 by the feed screw 15. The feed screw 15 is rotationally driven by the servomotor 16. The holder shaft 7a is pressed downward by a spring 17 so that the pressing force of the spring 17 can be adjusted by the adjusting bolt 18. [ Instead of the spring 17, the holder shaft 7a may be pressed downward by a chuck, a pneumatic cylinder, or a hydraulic cylinder.

The lens holder 7 holds the lens 6 such that the processed surface of the lens 6 faces downward. For example, the lens holder 7 holds the lens 6 by a chuck (not shown) or by vacuuming. However, during lens processing, it is possible to switch the chuck or vacuum suction to the open state. In the processing in the open state, the lens 6 is processed while the lens is rotated along the tool 8. The lens holder 7 is rotatable by a motor (not shown). In this example, the holder shaft 7a is vertically arranged, and the center axis 2a of the lens holder 7 attached to the lower end of the holder shaft 7a extends in the vertical direction (Z-axis direction).

The lower shafts unit 3 includes a lens 8 for holding a lens 6 held by a lens holder 7 and a lens 8 for rotating the tool 8 about its rotation center axis 3a And a moving mechanism 10 for moving the tool 8 with respect to the lens holder 7. The lens holder 7 is provided with a lens holder 7, The tool 8 with the lens is attached to the upper end of the spindle shaft 21 so as to face upward and the spindle shaft 21 is supported so as to be rotatable by the holding block 22. A spindle motor 23 for rotationally driving the spindle shaft 21 is mounted on the holding block 22. The spindle shaft 21, the holding block 22 and the spindle motor 23 constitute a rotation drive mechanism 9. [

1, the rotational center axis 3a of the spindle shaft 21 of the lower shaft unit 3 is connected to the upper shaft unit 2 The lens 8 holds the tool 8 at a position corresponding to the center axis 2a of the lens holder 7 of the lens holder 7. The moving mechanism 10 is provided with a position adjusting screw 25 (fourth driving mechanism) and first to third driving mechanisms 30, 50, and 60.

More specifically, the moving mechanism 10 includes a block supporting plate 24 for supporting the retaining block 12 of the tool 8 in a state in which the lens can reciprocate linearly in the Y-axis direction in the horizontal direction have. The position of the holding block 22 in the Y-axis direction with respect to the block supporting plate 24 is adjustable by a position adjusting screw 25 (fourth driving mechanism). Instead of the position adjusting screw 25, a drive mechanism having a motor, a feed screw, and a linear guide for linearly reciprocating the holding block 22 in the Y-axis direction may be mounted.

The block supporting plate 24 supporting the holding block 22 is mounted on the first driving mechanism 30. [ The first driving mechanism 30 includes guide rails 32a and 32b which are mounted on a support plate 31 arranged in a vertical posture and arranged parallel to the surface of the support plate 31 at regular intervals, A slide plate 33 slidable along the guide rails 32a and 32b, a feed screw 34 for sliding the slide plate 33 and a servo motor 35 for rotationally driving the feed screw 34 . A block supporting plate 24 is mounted on the surface of the slide plate 33 and the moving direction of the slide plate 33 is the direction in which the lens coincides with the rotation center axis 3a of the tool 8 .

A first support shaft 41 and a second support shaft 42 are connected to the back surface of the support plate 31 of the first drive mechanism 30. The first support shaft 41 is rotatable about a first axis 41a extending in a direction perpendicular to the plane including the rotation center axis 3a, that is, in a direction parallel to the Y axis, (31). The second support shaft 42 is supported on the back surface of the support plate 31 at a position spaced apart from the first support shaft 41 in the downward direction (43) to be slidable in a direction approaching and separating from the first support shaft (41). The second support shaft 42 is attached to the slide mechanism 43 so as to be rotatable about the second axis 42a parallel to the Y axis.

Next, the first supporting shaft 41 is mounted on the second driving mechanism 50, and linear reciprocating movement in the X-axis direction orthogonal to the Y-axis and Z-axis is performed by the second driving mechanism 50 It is possible. The second driving mechanism 50 includes a slide plate 51 to which the first support shaft 41 is fixed, a guide rail 52 to guide the slide plate 51 in the X axis direction, a guide rail A feed screw 53 for moving the slide plate 51 along the feed screw 52 and a servo motor 54 for driving the feed screw 53 to rotate. Likewise, the second support shaft 42 is mounted on the third drive mechanism 60, and can be linearly reciprocated in the X-axis direction by the third drive mechanism 60. [ The third drive mechanism 60 includes a slide plate 61 to which the second support shaft 42 is fixed, a guide rail 62 for guiding the slide plate 61 in the X axis direction, A feed screw 63 for moving the slide plate 61 along the rail 62 and a servo motor 64 for driving the feed screw 63 to rotate. On the other hand, the guide rails 52 and 62 are fixed to a mount (not shown) of the lens processing apparatus 1.

Next, the control unit 4 controls the servo motor 16 of the upper shaft unit 2, the spindle motor 23 of the rotation drive mechanism 9, the first to third drive mechanisms 30, 50 and 60 And drives and controls the servomotors 35, 54, and 64. The servomotors 35, 54 and 64 are individually driven and controlled so that the lens moves the tool 8 along a predetermined movement locus to cause the surface of the lens 6 held by the lens holder 7 to be machined .

(Example of operation of lens with tool)

Fig. 2 is an explanatory view showing an example of a case where the lens is moved by a moving mechanism 10 of the lens machining apparatus 1 to cause the tool to swing centripetally. That is, when the lens moves the tool 8 in the plane including the center axis 2a of the lens holder 7 about the center axis O of the working radius located on the center axis 2a of the lens holder 7, In which the lens 8 swings the tool 8 left and right in a state in which the rotation center axis 3a of the tool 8 is positioned. In the figure, the fulcrum A is the center of the first support shaft 41, and the fulcrum B is the center of the second support shaft 42.

The radius of curvature of the lens 6 is R, the distance between the center O of the processing radius and the fulcrum A is LO, the distance from the fulcrum radius O to the fulcrum B, When the difference between the radius R and the radius R is LT and the slope of the rotation center axis 3a of the tool 8 with respect to the Z axis is θ, the movement amount DELTA XA of the support point A and the movement amount DELTA XA of the support point B (DELTA XB) is set as follows.

? XA = LOtan?

DELTA XB = (R + LT) tan?

When the fulcrum A and the fulcrum B move, an error? Z is generated with respect to the working radius R as shown in Fig. 2, so that the rotational center axis 3a ) Is set as follows.

? Z = (LO / cos?) - LO

On the other hand, when the angle? Is 0, the center axis 2a of the lens holder 7 is the initial position where the lens coincides with the rotation center axis 3a of the tool 8.

At the time of processing the lens 6, the control section 4 calculates DELTA XA, DELTA XB and DELTA Z while finely varying the angle [theta] to a predetermined value. Based on the calculated DELTA XA, DELTA XB, and DELTA Z, the control unit 4 controls the servomotors 35, 54, and 64 in synchronization. The movement mechanism 10 of the lens machining apparatus 1 performs the calculation and the control in the control section 4 so that the lens centered on the machining radius center O performs the oscillating motion of the tool 8, Thereby realizing the processing of the oscillating type lens 6.

Here, when the movable range of the first driving mechanism 30 in the Z-axis direction is within the range of the working radius R, the fulcrum A is fixed and only the fulcrum B is moved, And the position of the tool 8 is adjusted by the lens in the Z-axis direction by the first drive mechanism 30 so that the machining of the collimator lens 6 can be realized.

If the lens 8 fixes the tool 8 at a predetermined position and angle without driving the servomotor and the lens 6 is machined by moving the upper shaft unit 2 up and down, Can be realized.

(Other Embodiments)

When a Y-axis driving mechanism composed of a feed screw and a servo motor is used as the fourth driving mechanism in place of the position adjusting screw 25 in the Y-axis direction, the lens is moved by the first to fourth driving mechanisms, The lens processing method by the planetary system can be realized. The combination of the movement of the tool 8 using the fourth drive mechanism in the Y axis direction and the movement of the tool 8 using the second and third drive mechanisms in the X axis direction, A machining method can be realized. In addition, by changing the calculation formulas of DELTA XA, DELTA XB and DELTA Z, it is possible to process multiple curved surfaces such as a non-spherical lens as well as a spherical lens.

The above example is an example in which the center axis 2a of the upper shaft unit 2 and the rotation center axis 3a of the lower shaft unit 3 are positioned in a straight line in the initial state . Needless to say, the state in which the center axis 2a and the rotation center axis 3a intersect at a predetermined angle at the machining radius center O may be an initial state.

In the above example, the lens holder 7 is arranged on the upper side and the tool 8 is arranged on the lower side. On the contrary, the lens holder 7 is arranged on the lower side, The tool 8 may be disposed. In addition, the lens holder 7 and the lens 8 may be opposed to each other in the horizontal direction, and the lens holder 7 and the lens may be fixed to the tool 8 in a direction different from the vertical direction or the horizontal direction. Or may be disposed opposite to each other. For example, in the case where the lens holder 7 and the lens 8 are disposed so as to face each other in the horizontal direction, the Z-axis in FIG. 1 may be arranged so as to be a horizontal axis.

1 is a perspective view showing a schematic configuration of a main part of a lens processing apparatus to which the present invention is applied.

Fig. 2 is an explanatory view showing an example of the operation in the case where the lens of the lens machining apparatus shown in Fig. 1 swings the tool centripetally.

Description of the Related Art [0002]

1: lens processing device 2: upper shaft unit

2a: central axis 3: lower shaft unit

3a: rotation center axis 4:

6: Lens 7: Lens holder

7a: Holder axis 8: lens with tool

9: rotation driving mechanism 10: moving mechanism

21: spindle shaft 22: retaining block

23: spindle motor 24: block supporting plate

25: position adjusting screw 30: first driving mechanism

31: support plates 32a, 32b: guide rails

33: slide plate 34: feed screw

35: Servo motor 41: First support shaft

41a: first axis 42: second supporting axis

42a: second axis 43: slide mechanism

50: second driving mechanism 51: slide plate

52: guide rail 53: feed screw

54: Servo motor 60: Third drive mechanism

61: slide plate 62: guide rail

63: Feed screw 64: Servo motor

Claims (3)

A lens holder 7 arranged in a state in which the central axis 2a extends in a predetermined Z-axis direction, A lens 8 for processing the lens 6 held by the lens holder 7, a tool 8, In the state that the lens has the rotation center axis 3a of the tool 8 in a plane parallel to the center axis 2a of the lens holder 7, (10) The moving mechanism (10) The lens has a first driving mechanism (30) for linearly reciprocating the tool (8) in the direction of the rotation center axis (3a) of the tool (8) A supporting member 31 for supporting the first driving mechanism 30, A first support shaft 41 connected to the support member 31 so as to be rotatable about a first axis 41a parallel to the Y-axis orthogonal to the plane, It is possible to linearly reciprocate in a direction in which the support member 31 approaches and separates from the first support shaft 41 at a position spaced apart from the first support shaft 41 in the Z axis direction, A second support shaft 42 connected to the support member 31 in a state of being rotatable about a second axis 42a parallel to the axis, A second drive mechanism (50) for linearly reciprocating the first support shaft (41) in the X axis direction orthogonal to the Y axis and Z axis, And a third drive mechanism (60) for linearly reciprocating the second support shaft (42) in the X axis direction. The method according to claim 1, Characterized in that the moving mechanism is a rocking mechanism for causing the lens to swing the tool around a point O on the center axis 2a of the lens holder 7 One). The method according to claim 1, The moving mechanism 10 is provided with a fourth driving mechanism 25 in which the lens linearly reciprocates the tool 8 in the Y-axis direction, And the fourth drive mechanism (25) is mounted on the first drive mechanism (30).

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