Lens holder device for lens centering, and spindle structure thereof

Abstract

To provide a lens holder device which facilitates replacement of a spindle and has a high axis core accuracy, and a spindle structure thereof, wherein the lens holder device is used for lens centering (centering device) and the spindle structure is used therefor.SOLUTION: A spindle structure of a lens holder to be used for centering a lens includes: a spindle with a lens holder at its tip side and a spindle shaft at its rear end side; a spindle holder for holding the spindle in a freely rotatable manner; a rotary member supported by the spindle holder in a freely rotatable manner; and a coupling member for coupling the spindle shaft and the rotary member in a freely detachable manner.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a lens holder device used in centering and external shaping processing of lenses such as optical lenses, and a spindle structure used therefor.

Background Art

[0002] When performing centering processing on an optical lens, the lens is sandwiched between a pair of holders arranged opposite to each other, and centering of the lens is performed by rotating it. Thereafter, external shaping to a perfect circle or external cutting is performed using a grinding wheel device.

[0003] For example, in Patent Document 1, although it is unclear how the lens is held by the lens holder and rotation is controlled, an example is disclosed in which the spindle of the lens holder is rotationally driven by a belt.

[0004] When rotation is controlled via a belt in this way, there are technical problems as shown in FIG. 4. A cup-shaped holder 11a for holding a lens is attached to the tip side of the spindle 11, and a spindle shaft 11b and a pulley 113 connected and fixed thereto are provided on the rear end side. The spindle 11 is rotatably held by a spindle holder 12. Conventionally, since the pulley 113 on the spindle side and the motor pulley 21 on the drive unit 20 side such as a motor are driven and transmitted by a belt 22, when replacing the spindle 11, first, as shown in FIG. 4(b), the belt 22 must be removed. Once the belt 22 is removed, when attaching the spindle 11, it is necessary to re-tension the belt 22 and align the axial centers of the pair of holders that sandwich the lens, and the adjustment is very difficult.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] The present invention aims to provide a lens holder device used for centering processing of a lens (centering processing device) and a spindle structure used therefor, which is easy to replace the spindle and has high axial core accuracy.

Means for Solving the Problems

[0007] The spindle structure of a lens holder according to the present invention is a spindle structure of a lens holder used for centering processing of a lens, comprising a spindle having a lens holder on the tip side and a spindle shaft on the rear end side, and a spindle holder for rotatably holding the spindle, the spindle holder having a rotating member rotatably supported thereon, and a connecting member for detachably connecting the spindle shaft and the rotating member.

[0008] Here, the meaning of detachably connecting the spindle shaft and the rotating member with a connecting member is that when the rotating member is used as a spindle pulley, the spindle can be removed as it is by removing the connecting member from the spindle pulley while a belt is stretched between this spindle pulley and a driving pulley on the driving part side such as a motor.

[0009] In the present invention, the spindle shaft and the driving part side may be directly connected without stretching a belt on the spindle pulley. Here, being directly connected means that the motor shaft serving as the driving part and the spindle shaft are connected using a coupling or the like without using a driving transmission means such as a belt. In this case, when replacing the spindle, the motor and the spindle are once removed from the inside of the rotating member together with the connecting member, and then the spindle is removed from the motor. The lens holder device according to the present invention has such a spindle structure, so that the holding accuracy of the lens is high. By incorporating it into the lens centering device, the grinding quality of the lens by the rotary grinding wheel is improved.

Effect of the Invention

[0010] In the lens holder device and the lens centering device according to the present invention, when the spindle is mounted inside the spindle holder via a rotating member, the spindle shaft is fixed inside the rotating member via a detachable connecting member. Therefore, it is easy to replace the spindle, and adjustment for aligning the axis is not required each time. Particularly, when the driving part and the spindle are belt - tensioned, it is not necessary to re - tension the belt.

Brief Description of the Drawings

[0011]

Figure 1

Figure 2

Figure 3

Figure 4

Embodiments for Carrying Out the Invention

[0012] An example of the structure of the spindle used in the lens centering device and the lens holder device according to the present invention will be described below with reference to the drawings. The spindle structure is schematically shown in FIG. 1, and the state where the spindle is removed from the spindle holder is shown in FIG. 2. The spindle 11 is rotatably attached inside the end of the spindle holder 12 via a support bearing 14. This spindle 11 has a holder 11a for the lens 1 on one tip side and a spindle shaft 11b on the other end side. The spindle shaft 11b and the rotating member 13 are fixed via a detachable connecting member 15 between the outer peripheral surface of the spindle shaft 11b and the inner peripheral surface of the rotating member 13. Thus, as shown in FIG. 2, the connecting member 15 can be removed, and the spindle 11 can be removed from the spindle holder 12 and replaced. The connecting member 15 is configured such that an inner ring and an outer ring are in contact with each other on their tapered surfaces. When the clamping bolt 15a is tightened, the inner ring and the outer ring move axially relative to each other, and the rotating member 13 and the spindle shaft 11b are fixedly connected by the wedge action. Therefore, when the clamping bolt 15a is loosened, the connecting member 15 can be removed.

[0013] In the present invention, the spindle shaft 11b or the rotating member 13 may be directly connected to the motor shaft of the drive unit 20 by a coupling or the like. However, in the examples shown in FIGS. 1 and 2, a drive pulley 21 connected to the drive unit 20 side and the rotating member 13 are used as spindle pulleys, and a belt 22 is stretched. In this case, as shown in FIG. 2, the spindle 11 can be replaced without removing the belt 22. Therefore, it is not necessary to re-tension the belt.

[0014] In lens centering, as shown in FIG. 3, the spindles 12, 12 are arranged opposite to each other, and the lens 1 is clamped by a pair of holders 11a. Therefore, although it is necessary to adjust so that the axial centers of the upper and lower spindles 12, 12 coincide on the same axis, since it is not necessary to re-tension the belt 22, it is not necessary to perform the axial center adjustment each time.

Explanation of Reference Numerals

[0015] 1 Lens 11 Spindle 11a Holder 11b Spindle Shaft 12 Spindle Holder 13 Rotating member (spindle pulley) 14 Support bearing 15 Connecting member 20 Driving section 21 Driving pulley 22 Belt

Claims

1. A spindle structure of a lens holder used for centering a lens, comprising: a spindle having a lens holder on the tip side and a spindle shaft on the rear end side; a spindle holder that rotatably holds the spindle; a rotating member rotatably supported by the spindle holder; and a connecting member that detachably connects the spindle shaft and the rotating member. The spindle structure of the lens holder is characterized by this.

2. The rotating member is a spindle pulley, and the spindle pulley and a drive unit are connected by a belt. The spindle structure of the lens holder according to Claim 1 is characterized by this.

3. The drive unit is directly connected to the spindle shaft. The spindle structure of the lens holder according to Claim 1 is characterized by this.

4. A lens holder device, characterized by having the spindle structure according to any one of Claims 1 to 3.

5. A lens centering processing device, characterized by having the spindle structure according to any one of Claims 1 to 3.

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