JP2001259980A - Lens centering and edging processing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens centering and edging processing device allowing a high precision processing of a lens without using any large diametric grinding wheel. SOLUTION: The lens centering and edging processing device has a body for processing 1 equipped with a pair of bell holders 2 and 3 positioned opposing and a processing means 4 to process the peripheral surface of a lens 300. The lens 300 center aligned optically is pinched by the bell holders 2 and 3, and the processing means 4 applies processing to its peripheral surface. The axis 7 of the two holders 2 and 3 is arranged approximately perpendicularly to the surface 5 on which the body 1 is installed, and the processing means 4 is installed movably approximately in the direction right crossing the axis 7 or the holders 2 and 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens centering apparatus for grinding an outer peripheral surface of a lens in accordance with an optical center axis of the lens.

[0002]

2. Description of the Related Art FIGS.
1 shows a conventional lens centering apparatus described in Japanese Patent Application Laid-Open Publication No. HEI 10-202,878. As shown in FIG. 5, a pair of bell holders 100 and 110 extending in the horizontal direction are opposed to each other, and the grindstone shaft holder 1 is arranged so as to be parallel to the pair of bell holders 100 and 110.
20 extends in the horizontal direction.

[0006] A pair of bell holders 100 and 110 hold a lens 300 to be processed, and lens holders 100 a and 110 a holding the lens 300 from right and left as shown in FIGS. Are mounted by screwing or the like. The holding of the lens 300 is performed by moving one bell holder 110 in the horizontal direction by operating the handle 130.

To transmit the rotational force to the pair of bell holders 100, 110, gears 140a, 150a are provided at the ends of the bell shafts 140, 150 of the respective bell holders 100, 110, and the transmission gear 1 is attached to each of the gears 140a, 150a.
60, 170, and these transmission gears 160, 1
This is performed by connecting the 70 with a transmission shaft 180. In this rotary drive system, the rotational force from the motor is transmitted from the drive gear 180 to the transmission gears 160 and 170, so that the rotational force can be transmitted.

[0005] Inside the grinding wheel shaft holder 120, a grinding wheel shaft 1 is provided.
A grindstone 200 is attached to the tip of the grindstone shaft 190 to grind the outer peripheral surface of the lens 300. The lens 300 is processed by the lens holders 100a and 11 of the bell holders 100 and 110.
This is performed by the grinding stone 200 approaching and contacting the lens 300 held by Oa. In this case, the transmission of the rotational force to the grinding wheel shaft 190 is performed by the plurality of pulleys 2.
10 and the belt 220.

In this lens centering apparatus, the lens 3
00 outside grinding and left and right chamfering with a single grindstone 200
It is done by. For this reason, as shown in FIGS. 6 to 8, the grindstone 200 has an outer diameter processing portion 200 a for processing the outer diameter of the lens 300 and a chamfering portion 2 for performing left and right chamfering.
00b and 200c.

First, as shown in FIG. 6, the outer diameter processing portion 200a of the grinding wheel 200 is
The outer diameter is processed by rotating the lens 300 and the grindstone 300 by bringing the lens 300 into contact with the end surface of the No. 0. Next, the grindstone 200 is horizontally moved to the right side, and as shown in FIG.
b is brought into contact with the lens 300, and the lens 300 and the grindstone 2
Rotate 00 to perform left-side chamfering. Thereafter, the grindstone 200 is horizontally moved to the left, and as shown in FIG.
The other chamfered portion 200c is brought into contact with the lens 300, and the lens 300 and the grindstone 200 are rotated to perform right-side chamfering.

[0008]

However, the conventional lens centering apparatus has the following problems.

(1) The grinding wheel shaft holder 120 and the bell holders 100 and 110 are arranged in parallel, and the lens 300
In the case of processing, the grinding wheel shaft holder 120 is
Since it is necessary to set the position so as not to interfere with 0 and 110, the outer diameter of the grindstone 200 must be increased accordingly.
However, when the outer diameter of the grindstone 200 is increased as described above, the wobble of the grindstone 200 at the time of machining increases, which adversely affects machining accuracy.

(2) During the chamfering of the lens 300, the grindstone 200 is moved horizontally. Since this direction is the direction in which the lens holders 100a and 110a extend, the lens holder 100a 110a is moved along the movement stroke of the grindstone 200. It is necessary to be longer than this. In addition, the lens holders 100a and 110b need to have a diameter smaller than the outer diameter of the lens 300. When processing a small-diameter lens having a diameter of 0.5 mm or the like, the lens holder has a smaller diameter. Since the lens holders 100a and 110a having a small diameter and a long length have insufficient strength,
It will not be able to withstand processing.

(3) Connect the lens 300 to the bell holder 100,
The work of centering by setting between 110 is
While holding the lens holder 100 with a finger,
Although the lens is held between the lens holders 110a and 110a, there is a risk that a finger holding the lens 300 may be pinched or bitten by the lens holders 100a and 110a. For this reason, it is conceivable to supply the lens by holding the outer periphery of the lens with a robot hand,
A lens with a small outer peripheral thickness is likely to roll, and thus has a problem that it cannot be gripped by a robot hand.

The present invention has been made in consideration of such conventional problems, and enables a grinding wheel having a small outer diameter to be close to a lens. The present invention provides a lens centering apparatus capable of using a strong lens holder, and capable of securely holding and processing even a small-diameter lens. With the goal.

[0013]

In order to achieve the above object, according to the first aspect of the present invention, a processing body for processing a pair of opposed bell holders and an outer peripheral surface of a lens is provided in a processing main body, and optical centering is performed. In the lens centering apparatus in which the processing means processes the outer peripheral surface of the lens while holding the pair of lenses by the pair of bell holders, the pair of bell holders have their axes substantially perpendicular to the installation surface of the processing body. And the processing means is arranged so as to be movable in a direction substantially orthogonal to the axis of the pair of bell holders.

In the present invention, since the pair of bell holders are disposed substantially perpendicular to the installation surface of the processing body, the centering can be performed by placing the lens on the bell holder located on the lower side. Therefore, even if the lens has a small diameter, there is no danger of the finger being pinched. Further, since the processing means performs the processing while moving from substantially orthogonal to the axis of the bell holder, it is not necessary to consider the interference between the processing means and the bell holder.
For this reason, even if the processing means has a small diameter, the lens can be processed, and the lens can be processed with high precision without blurring of the processing means.

According to a second aspect of the present invention, in the first aspect of the present invention, the processing means includes a plurality of grindstone units for processing different portions of the outer peripheral surface of the lens, and each of the grindstone units is a shaft of a bell holder. It is characterized by being movable in a direction substantially orthogonal to the center.

According to the present invention, since a plurality of whetstone units process different portions of the outer peripheral surface of the lens, the outer diameter processing,
Chamfering and the like can be shared by a plurality of grinding wheel units. Moreover, each of the plurality of grindstone units moves from a direction substantially perpendicular to the axis of the bell holder to process the outer diameter.
Since each processing such as chamfering is performed, the moving stroke of the grindstone unit for these processing is not required.
Therefore, it is not necessary to lengthen the lens holder of the bell holder that holds the lens, and a strong lens holder can be used.

[0017]

1 to 4 show an embodiment of the present invention. FIG. 1 is an overall front view, FIG. 2 is a plan view, and FIG.
FIG. 4 is a front view of a main part during processing. The lens centering apparatus according to this embodiment includes an apparatus main body 1, a pair of bell holders 2, 3 and a processing unit 4 arranged in the apparatus main body 1.

The apparatus main body 1 has a box shape as shown in FIG. 1 and is not shown. Inside the apparatus main body 1, a rotation drive system for rotating the bell holders 2 and 3 and a lens 300 are provided.
There are provided a bell holder moving system for moving the bell holders 2 and 3 so as to clamp the, a machining drive system for driving the machining means 4, and a control means for controlling the entire operation. The apparatus main body 1 has a horizontal installation surface 5 on which the bell holders 2 and 3 and the processing means 4 are installed. The installation surface 5 serves as a reference surface for disposing the bell holders 2 and 3 on the apparatus main body 1. When the processing main body 1 is mounted on a horizontal floor 6, the floor 6 is used as the installation surface. Is also possible.

The pair of bell holders 2 and 3 are arranged on the apparatus main body 1 so as to face each other. The pair of bell holders 2 and 3
The axis 7 is arranged on the apparatus main body 1 so as to be substantially perpendicular to the installation surface 5 of the apparatus main body 1. Therefore, the pair of bell holders 2 and 3 are arranged so as to face each other in the vertical direction.

As shown in FIG. 3, each of the bell holders 2, 3 has a lens holder 8,
9 are mounted along the axial direction. In this embodiment, a pair of bell holders 2 and 3 are attached to an upper shaft 10 and a lower shaft 11 to which a rotational force from a rotary drive system is transmitted, and rotate together with these shafts 10 and 11. It has become.

The processing means 4 has an XYZ robot 12 which moves in a three-dimensional direction orthogonal to the processing means. XYZ robot 1
2 is a Z motor 1 provided on an installation surface 5 of the apparatus main body 1.
Z table 14 that moves up and down by driving
A Y table 15 supported on the Z table 14 so as to be movable in the Y direction, and an X table 16 (see FIG. 2) supported on the Y table 15 so as to be movable in the X direction (bell holder 2 and 3 directions). I have. In this case, the Y table 15 is moved by driving the Y motor 17.

In this embodiment, the processing means 4
It has the basic grindstone units 21, 22, 23. These whetstone units 21, 22, and 23 are provided with an X table 16
Are arranged in parallel to each other, and each grinding unit 2
1, 22, 23 have grinding wheels 24, 25, 26 at their tips. Each of the grindstone units 21, 22, and 23 is movable along a direction substantially orthogonal to the axis 7 of the bell holder 2 or 3.

In order to perform this movement, each grinding wheel unit 2
Each of the grinding wheel units 21, 22, 23 has an X motor 17 and a screw rod 18 extending from the X motor 17 in the direction of the bell holders 2, 3. Are bell holders 2 and 3
Move in a direction substantially orthogonal to the axis 7 of. By this movement, the grindstones 24, 25, 26 move in a direction perpendicular to the axis 7 of the bell holders 2, 3, and come into contact with and separate from the lens 300.

Further, each of the grindstone units 21, 22, 23
Has grinding wheel drive motors 27, 28, 29 for rotating the grinding wheels 24, 25, 26,
Are rotated to grind the lens 300.

FIG. 4 shows a whetstone unit 2 of this embodiment.
The grindstones 24, 25, and 26 used for 1, 2, 23 are shown, respectively. The three types of grindstones 24, 25 and 26 are lenses 30
0 is a shape for machining a different portion of the outer peripheral surface, the grindstone 24 performs one chamfering process of the lens 300, the grindstone 25 performs the outer diameter machining of the lens 300, and the grindstone 2
Reference numeral 6 denotes the other chamfering of the lens 300. Therefore, the three grindstone units 21, 22, 23
Thereby, all of the outer peripheral surface processing of the lens 300 can be performed.

Next, processing of the lens according to this embodiment will be described. First, the entire processing means 4 is attached to a bell holder 2.
3 and hold the lens 300 with your finger,
The lens 300 is placed on the lens holder 9 of the lower bell holder 3 and is held by the lens holder 8 of the upper bell holder 2.
Sandwich. Then, light vibration is applied to the lens 300 by a vibration pin or the like (not shown), so that the shaft center 7 is
Optical centering of the lens 300 is performed.

In the centering of the lens 300, it is only necessary to mount the lens 300 on the lens holder 9. Therefore, even if the lens has a small diameter such as 0.5 mm, a finger may be caught in the lens holder, There is no danger of being bitten. or,
There is no need to use a robot hand, and the lens can be securely held.

After the optical centering, the lens 300 is held by the lens holders 8 and 9, and in this holding state, the XYZ robot 12 of the processing means 4 is driven to move the grindstone 25 for the outer diameter processing to the lens. Align to 300. Then, as shown by the solid line in FIG. 3, the grindstone 25 is moved by the X motor 17 from a direction substantially perpendicular to the axis 7 of the bell holders 2 and 3 to abut on the outer peripheral surface of the lens 300, and the outer diameter processing is performed. Do. After outer diameter machining, one of the grinding wheels 24 for chamfering
Is similarly moved from a direction substantially perpendicular to the axis 7 to abut on one edge of the lens 300 to perform chamfering. Then, the other grindstone 26 for chamfering is moved to the other edge of the lens 300. The part is moved so as to come into contact with the part and chamfering is performed. Thus, the processing on the entire outer peripheral surface of the lens 300 is completed.

In processing the outer peripheral surface of the lens 300,
Since each of the grindstones 24, 25, and 26 is moved substantially orthogonally to the axis 7 of the bell holders 2 and 3 for processing, interference between the respective grindstone units 21, 22, and 23 and the bell holders 2 and 3 is considered. You don't have to. For this reason,
A grindstone having a small diameter can be used as the grindstones 24, 25, and 26, and the lens 300 can be processed with high precision without causing the whetstones 24, 25, and 26 to shake.

Further, in this embodiment, each of the grindstone units 21, 22, 23 is provided with the shaft center 7 of the bell holder 2, 3.
Since the outer diameter processing and the chamfering are performed by moving from a direction substantially orthogonal to the direction, the moving stroke of the grindstone units 21, 22, and 23 for performing the outer diameter processing and the chamfering is unnecessary. For this reason, it is not necessary to lengthen the lens holders 8 and 9 for holding the lens 300, and the strong lens holders 8 and 9 can be used. Thus, even if the lens has a small diameter, the lens holder can securely hold the lens, and the lens can be processed with high precision.

The present invention is not limited to the above embodiment, but can be variously modified. For example, three or more grindstone units may be arranged, and the grindstone units may be moved by means other than the XYZ robot 12.

[0032]

According to the first aspect of the present invention, since the pair of bell holders are disposed substantially perpendicular to the installation surface of the processing body, the lens can be easily set on the bell holder. There is no danger of a finger being pinched even with a small-diameter lens. In addition, since the processing means performs processing by moving from substantially orthogonal to the axis of the bell holder, there is no need to consider interference between the processing means and the bell holder, and even a processing means using a small-diameter grindstone. The lens can be processed, and the lens can be processed with high precision without blurring during processing.

According to the invention of claim 2, in addition to the effect of the invention of claim 1, a plurality of grindstone units move from a direction substantially perpendicular to the axis of the bell holder to perform outer diameter machining, chamfering, etc. Therefore, the moving stroke of the grindstone unit is not required, and it is not necessary to lengthen the lens holder of the bell holder for holding the lens, and a strong lens holder can be used.

[Brief description of the drawings]

FIG. 1 is a front view showing an entire lens centering apparatus according to an embodiment of the present invention.

FIG. 2 is a plan view of one embodiment.

FIG. 3 is a front view showing a processing state according to the embodiment;

FIGS. 4A, 4B, and 4C are front views each showing a shape of a grindstone.

FIG. 5 is a front view of a conventional lens centering apparatus.

FIG. 6 is a front view showing outer diameter processing by a conventional lens centering apparatus.

FIG. 7 is a front view showing chamfering by a conventional lens centering apparatus.

FIG. 8 is a front view showing another surface chamfering by the conventional lens centering apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Apparatus main body 2 3 Bell holder 4 Processing means 5 Installation surface 7 Axis 21 22 23 Grinding stone unit 24 25 26 Grinding stone

Claims (2)

[Claims] A processing body for processing an outer peripheral surface of a pair of opposed bell holders and a lens is provided in a processing body, and the processing means is configured to hold an optically centered lens by the pair of bell holders. In a lens centering apparatus for processing an outer peripheral surface, the pair of bell holders are disposed such that their axes are substantially perpendicular to an installation surface of a processing body, and the processing means is an axis of the pair of bell holders. A lens centering apparatus which is disposed so as to be movable in a direction substantially perpendicular to the lens. 2. The processing means includes a plurality of whetstone units for processing different portions of an outer peripheral surface of a lens, respectively.
2. The lens centering apparatus according to claim 1, wherein each of the whetstone units is movable in a direction substantially orthogonal to the axis of the bell holder.