JP2014087869A - Centering device, holder for centering processing, and centering method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a centering device, a holder for centering processing, and a centering method that can perform outer periphery processing on a plurality of lenses simultaneously.SOLUTION: A centering device which grinds an outer peripheral surface of a lens two mutually opposite optical surfaces of which are spherical after centering the lens includes: a fixed bell holder 3a and a movable bell holder 4a which are arranged opposite each other while having their center axes aligned with each other; and an intermediate bell holder 5 which is cylindrical and arranged between the fixed bell holder 3a and movable bell holder 4a, and come into contact with the different lenses 1, 2 on both ends so as to maintain the centering state of the lenses 1, 2 having been centered.

Description

  The present invention relates to a centering device that performs centering on a polished lens, a centering holder, and a centering method.

  In the lens manufacturing process, after polishing the lens, the outer periphery of the lens is ground with a grindstone and finished to a predetermined shape and size in order to match the optical axis of the lens with the central axis of the lens outer diameter. Processing is performed. Since the outer peripheral surface of the lens serves as a reference surface when the lens is incorporated into an optical device such as a camera, it is very important to perform centering with high accuracy.

  When this centering is performed, centering is performed so that the optical axis of the lens matches the rotation axis of the processing machine. As a centering method, a system is known in which a lens is sandwiched between two cup-shaped holders (called bell holders) whose center axes are coincident with each other, and the centers are mechanically centered. (For example, refer to Patent Document 1). Such a centering method is called a bell clamp method.

JP-A-2005-14182

  However, in the conventional centering process, since the outer peripheral surface of the lens is ground one by one, the processing efficiency of the lens (the number of processing per hour) cannot be increased.

  The present invention has been made in view of the above, and an object of the present invention is to provide a centering device, a centering processing holder, and a centering method capable of simultaneously performing peripheral processing on a plurality of lenses. To do.

  In order to solve the above-described problems and achieve the object, the centering device according to the present invention centered a lens in which each of two optical surfaces facing each other has a spherical shape, and then the outer peripheral surface of the lens was adjusted. In the centering device for grinding, the first and second bell holders arranged opposite to each other with their center axes coincided with each other, and formed in a cylindrical shape between the first and second bell holders, at both ends. An intermediate bell holder that abuts on different lenses and maintains the centered state of each lens after centering.

  In the centering device, the first bell holder is arranged at a fixed position on the central axis, and the second bell holder is arranged so as to be movable along the central axis.

  The centering device further includes a decompression means for attracting the lens to the first bell holder by decompressing a space surrounded by the first bell holder and the lens abutted on the first bell holder. It is characterized by providing.

  The centering device further includes adjusting means for aligning a rotation center axis of the intermediate bell holder with the center axis.

  In the centering device, the second bell holder can be fitted to an inner periphery of the intermediate bell holder and can be removed from the intermediate bell holder.

  The centering device further includes support means for supporting the intermediate bell holder in a state where a rotation center axis of the intermediate bell holder is aligned with the central axis.

  The centering device includes a grindstone having a grinding surface capable of simultaneously grinding the plurality of lenses held by the first bell holder, the intermediate bell holder, and the second bell holder, and driving means for rotating the grindstone. Are further provided.

  A centering holder for centering according to the present invention is used for centering processing used in a centering device for centering a lens in which each of two optical surfaces facing each other has a spherical shape, and then grinding the outer peripheral surface of the lens. A holder, which is cylindrical and is arranged between two bell holders arranged opposite to each other so that their center axes coincide with each other, abuts against different lenses at both ends, and each centered lens is centered. It is characterized by maintaining the released state.

  The centering method according to the present invention is the centering method in which the outer peripheral surface of the lens is ground after aligning the lens in which each of the two optical surfaces facing each other has a spherical shape, and the center axes thereof are made to coincide with each other. A first centering step for centering the first lens by bringing the tips of the first and second bell holders arranged opposite to each other into contact with the two optical surfaces of the first lens; While one optical surface of the first lens is in contact with the first bell holder, the second bell holder is separated from the other optical surface of the first lens, and one end of a cylindrical intermediate bell holder is formed. An intermediate bell holder placement step for contacting the other optical surface of the first lens, and the other end of the intermediate bell holder and the tip of the second bell holder are arranged on the second lens different from the first lens. Two By contacting each Manabu surface, characterized in that it comprises a second centering step of performing centering of the second lens, the.

  In the centering method, the intermediate bell holder arranging step causes the first bell holder to be attracted to the first bell holder by decompressing the space surrounded by the first bell holder and the first lens. It is characterized by being executed.

  In the centering method, the intermediate bell holder disposing step is characterized in that the intermediate bell holder is placed on the first lens with the central axes of the first and second bell holders oriented in the vertical direction.

  In the centering method, in the intermediate bell holder arranging step, the second bell holder is fitted to the inner periphery of the intermediate bell holder so that the rotation center axis of the intermediate bell holder coincides with the central axis. To do.

  The centering method further includes a grinding step of grinding the outer peripheral surfaces of the first and second lenses simultaneously after the second centering step.

  According to the present invention, the plurality of lenses are held by the first and second bell holders via the intermediate bell holder, and the plurality of lenses are coaxially maintained in the centered state. On the other hand, it becomes possible to perform peripheral processing simultaneously.

FIG. 1 is a top view showing the configuration of the centering apparatus according to Embodiment 1 of the present invention. FIG. 2 is a cross-sectional view taken along the line AA of FIG. FIG. 3 is a top view for explaining a centering process by the centering device shown in FIG. FIG. 4 is a top view for explaining a centering process by the centering device shown in FIG. FIG. 5 is a top view for explaining the outer peripheral machining step by the centering device shown in FIG. FIG. 6 is a top view showing the configuration of the centering apparatus according to Embodiment 2 of the present invention. 7 is a cross-sectional view taken along line BB in FIG. 8 is a cross-sectional view taken along the line CC of FIG. FIG. 9 is a top view for explaining a centering process by the centering device shown in FIG. FIG. 10 is a top view for explaining the centering step by the centering device shown in FIG. FIG. 11 is a cross-sectional view for explaining a centering process by the centering device shown in FIG. FIG. 12 is a cross-sectional view for explaining a centering process by the centering device shown in FIG. 13 is a cross-sectional view taken along the line DD of FIG. FIG. 14 is a cross-sectional view for explaining a centering process by the centering device shown in FIG. FIG. 15 is a top view for explaining the outer peripheral machining step by the centering device shown in FIG. FIG. 16 is a front view showing the configuration of the centering apparatus according to Embodiment 3 of the present invention. 17 is a cross-sectional view taken along line EE in FIG. 18 is a side sectional view for explaining a centering process by the centering device shown in FIG. FIG. 19 is a side sectional view for explaining a centering process by the centering device shown in FIG. FIG. 20 is a side sectional view for explaining the centering process by the centering device shown in FIG. FIG. 21 is a side sectional view for explaining a centering process by the centering device shown in FIG. FIG. 22 is a side sectional view for explaining a centering process by the centering device shown in FIG. FIG. 23 is an enlarged cross-sectional view of the intermediate bell holder shown in FIG. FIG. 24 is a side sectional view for explaining a centering process by the centering device shown in FIG. FIG. 25 is a side sectional view for explaining a centering process by the centering device shown in FIG. FIG. 26 is a side sectional view for explaining the centering step by the centering device shown in FIG. FIG. 27 is a front view for explaining an outer periphery processing step by the centering device shown in FIG. 16.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited by these embodiments. Moreover, in description of each drawing, the same code | symbol is attached | subjected and shown to the same part. It should be noted that the drawings are schematic, and the dimensional relationships and ratios of each part are different from the actual ones. Also between the drawings, there are included portions having different dimensional relationships and ratios.

(Embodiment 1)
FIG. 1 is a top view showing the configuration of the centering apparatus according to Embodiment 1 of the present invention. FIG. 2 is a cross-sectional view taken along the line AA of FIG.
As shown in FIGS. 1 and 2, the centering device 100 according to the first embodiment centers the lenses 1 and 2 whose optical surfaces form part of a spherical surface by the bell clamp method, 2 is a centering device for grinding the outer peripheral surfaces 1a, 2a. Each of the lenses 1 and 2 is previously polished so that each of the two optical surfaces facing each other has a spherical shape. In the following, the case where the optical surfaces of the lenses 1 and 2 form a convex spherical surface will be described. However, this embodiment is also applied to a lens whose optical surface forms a concave spherical surface and a lens whose one optical surface is flat. The first embodiment can be similarly applied.

  The centering device 100 includes a fixed bell holder (first bell holder) 3a and a movable bell holder (second bell holder) 4a, which are opposed to each other with their center axes (work axis L1) being coincident with each other, and these fixed bell holders 3a, And an intermediate bell holder 5 disposed between the movable bell holder 4a. The centering device 100 includes a fixed shaft spindle 3b and a fixed shaft housing 3c that rotatably support the fixed bell holder 3a, a movable shaft spindle 4b and a movable shaft housing 4c that rotatably support the movable bell holder 4a, and the lens 1. 2, a grindstone 6a that grinds the outer peripheral surfaces 1a, 2a, a grindstone shaft motor 6b that rotationally drives the grindstone 6a, a grindstone rocking stage 6c that moves the grindstone shaft motor 6b in a predetermined direction, and a grindstone cutting stage 6d, a movable shaft stage 10 provided with a cylinder 9a and a slider 9b, and a work shaft motor 11a that rotationally drives the fixed bell holder 3a and the movable bell holder 4a. 1 and 2, the centering device 100 is installed such that the workpiece axis L1 is in the horizontal direction, but the installation direction is not particularly limited.

  The fixed bell holder 3a and the movable bell holder 4a are cup-shaped members having a circular shape whose tip is orthogonal to the work axis L1. The distal ends of each of the fixed bell holder 3a and the movable bell holder 4a have a tapered shape whose inner periphery is deeply cut compared to the outer periphery, and abut the optical surfaces of the lenses 1 and 2 on the outer periphery. In addition, the diameter of a front-end | tip part may mutually be the same with the fixed bell holder 3a and the movable bell holder 4a, and may mutually differ.

  The fixed shaft spindle 3b is rotatably supported by a fixed shaft housing 3c provided at a fixed position on the base 8. A fixed bell holder 3a is attached to one end side of the fixed shaft spindle 3b, and a fixed shaft gear 3d is attached to the other end side.

  The movable shaft spindle 4b is rotatably supported by a movable shaft housing 4c provided on the slider 9b. A movable bell holder 4a is attached to one end of the movable shaft spindle 4b, and a movable shaft gear 4d is attached to the other end. A cylinder 9a is connected to the rear end of the movable shaft spindle 4b.

  The movable axis stage 10 is provided so as to be movable along the work axis L <b> 1 with respect to the base 8. By moving the movable axis stage 10, the movable bell holder 4 a can be brought close to or retracted from the workpiece position W.

  The cylinder 9a is provided so that it can extend and contract along the work axis L1. The slider 9b is provided on the movable axis stage 10 so as to be slidable along the work axis L1. By extending the cylinder 9a and sliding the slider 9b in the workpiece position W direction, it is possible to bring the movable bell holder 4a closer to the fixed bell holder 3a and pressurize the workpiece sandwiched between the movable bell holder 4a and the fixed bell holder 3a. Become. On the contrary, the movable bell holder 4a can be separated from the workpiece by compressing the cylinder 9a and sliding the slider 9b in the direction opposite to the workpiece position W.

  The intermediate bell holder 5 has a cylindrical shape, and is a centering holder that maintains the centered state of the lenses 1 and 2 by holding the lenses 1 and 2 together with the fixed bell holder 3a and the movable bell holder 4a. Both end portions of the intermediate bell holder 5 have a tapered shape whose inner periphery is deeply cut compared to the outer periphery, and abut the optical surfaces of the lenses 1 and 2 on the outer periphery. The diameter of the intermediate bell holder 5 may be the same as or different from the fixed bell holder 3a and the movable bell holder 4a.

  A work shaft gear 11b is attached to the work shaft motor 11a. The rotation of the work shaft motor 11a is transmitted to the fixed shaft spindle 3b via the transmission shaft fixed side gear 12a and the fixed shaft gear 3d, and the transmission shaft 12b and the transmission shaft movable side gear supported by the transmission shaft housing 12c. 12d and the movable shaft gear 4d are transmitted to the movable shaft spindle 4b. As a result, the fixed bell holder 3a and the movable bell holder 4a can be simultaneously rotated at the same speed and stopped simultaneously.

  The grindstone 6a has a disc shape (cylindrical shape) in which the outer peripheral surface 6e is a grinding surface. The length of the grindstone 6a in the rotation axis direction is preferably set to a length that allows grinding on the outer peripheral surfaces 1a and 2a of the plurality of lenses 1 and 2 at the same time. Specifically, the length of the grindstone 6a may be made longer than the length obtained by adding the thicknesses of the lenses 1 and 2 to the axial length of the intermediate bell holder 5.

  The grindstone rocking stage 6c is provided so as to be rockable with respect to the base 8 along the workpiece axis L1. On the other hand, the grindstone cutting stage 6d is provided so as to be movable along a direction orthogonal to the workpiece axis L1. Accordingly, the rotating grindstone 6a can be cut in the direction of the lenses 1 and 2 while swinging in parallel with the workpiece axis L1, and the outer peripheral surfaces 1a and 2a of the lenses 1 and 2 can be ground.

  Next, the centering method of the lens according to Embodiment 1 will be described with reference to FIGS. 3 and 4 are top views for explaining the centering process by the centering device 100, and FIG. 5 is a top view for explaining the outer periphery processing step by the centering device 100. FIG.

  First, as shown in FIG. 3, while the grindstone cutting stage 6d is retracted from the workpiece position W, the cylinder 9a is compressed and the movable shaft stage 10 is moved to the opposite side of the workpiece position W. The movable bell holder 4a is retracted from the work position W. Thereby, a space for setting the centering object (lenses 1 and 2) at the work position W is formed.

  Subsequently, as shown in FIG. 4, the lens 1, the intermediate bell holder 5, and the lens 2 are arranged in this order between the fixed bell holder 3a and the movable bell holder 4a, and one optical surface of the lens 1 is fixed to the fixed bell holder 3a. Abut. Then, the movable shaft stage 10 is moved to the workpiece position W side, and the cylinder 9 a is extended to bring the movable bell holder 4 a into contact with the other optical surface of the lens 2. In this way, the ends of the fixed bell holder 3a, the intermediate bell holder 5, and the movable bell holder 4a are brought into contact with the optical surfaces of the lenses 1 and 2 to center the lenses 1 and 2.

  Subsequently, as shown in FIG. 5, the work shaft motor 11a is driven to rotate the lenses 1 and 2 while the lenses 1 and 2 are held by the fixed bell holder 3a, the intermediate bell holder 5 and the movable bell holder 4a. On the other hand, the grindstone shaft motor 6b is driven to rotate the grindstone 6a. Then, the grindstone cutting stage 6d is moved while the grindstone 6a is swung by the grindstone rocking stage 6c, and the grindstone 6a is cut into the lenses 1 and 2. Thereby, the outer peripheral surfaces 1a and 2a of the lenses 1 and 2 are ground.

  After grinding the outer peripheral surfaces 1a and 2a by a desired amount, the grindstone 6a is retracted, and the rotation of the lenses 1 and 2 and the grindstone 6a is stopped. Then, the cylinder 9 a is compressed and the movable shaft stage 10 is moved to the side opposite to the workpiece position W to retract the movable bell holder 4 a and remove the lenses 1 and 2 from the centering device 100.

  As described above, according to the first embodiment, the fixed bell holder 3a and the movable bell holder 4a hold the two lenses 1 and 2 through the intermediate bell holder 5, and the lenses 1 and 2 are coaxially centered. Can be maintained. Therefore, it is possible to simultaneously perform the outer peripheral processing on the lenses 1 and 2 and improve the processing efficiency of the lenses.

  In the first embodiment, the outer periphery processing is performed on the two lenses 1 and 2 at the same time. However, the outer periphery processing may be performed on each of the lenses 1 and 2 sequentially.

  In the first embodiment, the lenses 1 and 2 and the intermediate bell holder 5 may be centered in advance and fixed using an adhesive or the like to form a unit. In this case, the lenses 1, 2 and the intermediate bell holder 5 can be easily attached to the centering device 100.

  In the first embodiment, two or more intermediate bell holders may be used to hold three or more lenses between the fixed bell holder 3a and the movable bell holder 4a, and the peripheral processing may be performed simultaneously. In this case, as described above, it is preferable that the intermediate bell holders and the lenses are alternately arranged and centered in advance so as to be easy to handle.

(Embodiment 2)
Next, a second embodiment of the present invention will be described. FIG. 6 is a top view showing the configuration of the centering apparatus according to the second embodiment. 7 is a cross-sectional view taken along line BB in FIG.
As shown in FIGS. 6 and 7, the centering device 200 according to the second embodiment is different from the centering device 100 shown in FIG. 1 in that the fixed bell holder 21a and the fixed bell holder 21a are fixed instead of the fixed bell holder 3a and the fixed shaft spindle 3b. A shaft spindle 21b is provided. The centering device 200 further includes a rotary joint 21c connected to the fixed shaft spindle 21b, and an upper expansion / contraction mechanism 22 and a base side expansion / contraction mechanism 23 for holding the intermediate bell holder 5. The configuration of the centering device 200 is the same as that of the centering device 100 except for the fixed bell holder 21a, the fixed shaft spindle 21b, the rotary joint 21c, the upper expansion / contraction mechanism 22 and the base side expansion / contraction mechanism 23. 6 and 7, the centering device 200 is installed such that the workpiece axis L1 is in the horizontal direction, but the installation direction is not particularly limited.

  The fixed bell holder 21a and the fixed shaft spindle 21b are provided with air holes 21a 'and 21b' penetrating along the work axis L1, respectively. When the lens 1 is brought into contact with the fixed bell holder 21a, a pressure reducing mechanism (not shown) connected to the rotary joint 21c causes a space surrounded by the fixed bell holder 21a and the lens 1 through the air holes 21a ′ and 21b ′. , The lens 1 is sucked and held by the fixed bell holder 21a.

  The upper telescopic mechanism 22 is supported above the workpiece position W by a support portion 24 connected to the fixed shaft housing 3c. On the other hand, the base side expansion / contraction mechanism 23 is installed on the base 8.

  8 is a cross-sectional view taken along the line CC of FIG. As shown in FIG. 8, the upper telescopic mechanism 22 includes a rod-shaped support member 22a and a telescopic portion 22b that expands and contracts by, for example, hydraulic pressure or air pressure. The support member 22a moves downward when the expansion / contraction part 22b extends, and comes into contact with the intermediate bell holder 5 at the tip.

  On the other hand, the base-side expansion / contraction mechanism 23 includes a bending member 23a and an expansion / contraction part 23b that expands and contracts by, for example, hydraulic pressure or air pressure. The bending member 23a has a curved shape along the outer periphery of the intermediate bell holder 5, and moves upward when the telescopic portion 23b is extended. The protruding portion 23c provided at two ends of the bending member 23a contacts the intermediate bell holder 5. Touch. That is, the intermediate bell holder 5 is supported at three locations by the upper extension mechanism 22 and the base side extension mechanism 23.

  The operations of the extendable parts 22b and 23b are electrically controlled by a control part (not shown). Further, the extension amounts of the expansion / contraction portions 22b and 23b when supporting the intermediate bell holder 5 are set in advance so that the central axis of the intermediate bell holder 5 coincides with the workpiece axis L1. That is, the upper telescopic mechanism 22 and the base side telescopic mechanism 23 are adjusting means for adjusting the position and inclination of the intermediate bell holder 5 so that the central axis of the intermediate bell holder 5 coincides with the workpiece axis L1, and the coincident state is obtained. Support means to maintain.

  Next, a method for centering a lens according to Embodiment 2 will be described with reference to FIGS. 9 to 14 are top views or cross-sectional views for explaining the centering process by the centering device 200, and FIG. 15 is a top view for explaining the outer periphery processing step by the centering device 200. FIG.

  First, as shown in FIG. 9, in a state where the grindstone cutting stage 6d is retracted from the workpiece position W, the cylinder 9a is compressed and the movable shaft stage 10 is moved to the opposite side of the workpiece position W. The movable bell holder 4a is retracted from the work position W.

  Subsequently, as shown in FIG. 10, one of the optical surfaces of the lens 1 is brought into contact with the fixed bell holder 21a, the movable shaft stage 10 is moved to the work position W side, and the cylinder 9a is extended, thereby moving the bell holder. 4 a is brought into contact with the optical surface of the lens 1. Thus, the lens 1 is centered by holding the lens 1 between the fixed bell holder 21a and the movable bell holder 4a.

  Subsequently, the space surrounded by the fixed bell holder 21a and the lens 1 is decompressed by a decompression mechanism (not shown), and the lens 1 is attracted to the fixed bell holder 21a while maintaining the centered state of the lens 1. Then, as shown in FIG. 11, the movable bell holder 4 a is retracted by compressing the cylinder 9 a and moving the movable shaft stage 10 to the side opposite to the workpiece position W.

  Subsequently, as shown in FIGS. 12 and 13, with the one end of the intermediate bell holder 5 being in contact with the other optical surface of the lens 1, the upper extension mechanism 22 and the base side extension mechanism 23 are operated to support the support member. The intermediate bell holder 5 is supported at three locations by 22a and the bending member 23a. As a result, the central axis of the intermediate bell holder 5 is in a state where it coincides with the workpiece axis L1.

  Subsequently, as shown in FIG. 14, the movable shaft stage 10 is moved to the work position W side while the one optical surface of the lens 2 is in contact with the other end of the intermediate bell holder 5, and the cylinder 9a is extended. Thus, the movable bell holder 4 a is brought into contact with the other optical surface of the lens 2. In this way, the lens 2 is centered by sandwiching the lens 2 between the intermediate bell holder 5 and the movable bell holder 4a.

  Subsequently, the upper telescopic mechanism 22 and the base side telescopic mechanism 23 are operated again, and the support member 22a and the bending member 23a are retracted from the intermediate bell holder 5. As a result, the intermediate bell holder 5 is in a rotatable state while maintaining a state in which the central axis coincides with the workpiece axis L1.

  Subsequently, as shown in FIG. 15, while the lenses 1 and 2 are held by the fixed bell holder 21a, the intermediate bell holder 5, and the movable bell holder 4a, the work shaft motor 11a is driven to rotate the lenses 1 and 2, and the grindstone The shaft motor 6b is driven to rotate the grindstone 6a. Then, the grindstone 6a is cut into the lenses 1 and 2 by the grindstone cutting stage 6d while the grindstone 6a is swung by the grindstone rocking stage 6c, whereby the outer peripheral surfaces 1a and 2a of the lenses 1 and 2 are ground. Do.

  After grinding the outer peripheral surfaces 1a and 2a by a desired amount, the grindstone 6a is retracted, and the rotation of the lenses 1 and 2 and the grindstone 6a is stopped. Then, the cylinder 9 a is compressed and the movable shaft stage 10 is moved to the opposite side of the workpiece position W to retract the movable bell holder 4 a and remove the lenses 1 and 2 from the centering device 200.

  As described above, according to the second embodiment, since the lenses 1 and 2 are centered individually, the centering accuracy of the lenses 1 and 2 can be improved. Therefore, it is possible to efficiently perform high-precision centering on the lenses 1 and 2.

(Embodiment 3)
Next, a third embodiment of the present invention will be described. FIG. 16 is a front view showing the configuration of the centering apparatus according to the third embodiment. 17 is a cross-sectional view taken along line EE in FIG.
As shown in FIGS. 16 and 17, the centering device 300 according to the third embodiment is different from the centering device 200 shown in FIGS. 6 and 7 in that the intermediate bell holder 5, the upper telescopic mechanism 22, and the base side telescopic mechanism. Instead of 23, an intermediate bell holder 31 and an intermediate bell holder support mechanism 32 are provided. The configuration of the centering device 300 other than the intermediate bell holder 31 and the intermediate bell holder support mechanism 32 is the same as that of the centering device 200. The centering device 300 is installed such that the workpiece axis L1 is in the vertical direction.

  The intermediate bell holder 31 is a member having a cylindrical shape as a whole and having a notch 31a formed in a part of the outer peripheral side surface. Further, the inner diameter of the intermediate bell holder 31 is slightly larger than the outer diameter of the movable bell holder 4a. Thereby, the movable bell holder 4a can be fitted to the inner periphery of the intermediate bell holder 31 and removed from the inner periphery. That is, in the third embodiment, the movable bell holder 4 a functions as an adjusting means for centering the lenses 1 and 2 and for centering the intermediate bell holder 31 by being fitted to the intermediate bell holder 31.

  In FIG. 17, the diameter of the fixed bell holder 21a and the diameter of the intermediate bell holder 31 are made equal and the diameter of the movable bell holder 4a is made smaller than these diameters. The diameter of the intermediate bell holder 31 may be made larger than these diameters. Alternatively, the diameters of these three bell holders may be different from each other.

  The intermediate bell holder support mechanism 32 includes a pressing plate 32a, a horizontal movement mechanism 32b that moves the pressing plate 32a in the horizontal direction, and a vertical movement mechanism 32c that moves the pressing plate 32a in the vertical (vertical) direction. It is a support means for supporting the intermediate bell holder 31 in a state where the central axis of the intermediate bell holder 31 is aligned with the workpiece axis L1.

  Next, a method for centering a lens according to Embodiment 3 will be described with reference to FIGS. 18 to 26 are side sectional views for explaining a centering process by the centering device 300. FIG. FIG. 27 is a front view for explaining the outer peripheral machining step by the centering device 300.

  First, as shown in FIG. 18, with the grindstone cutting stage 6d retracted from the workpiece position W, the cylinder 9a is compressed and the movable shaft stage 10 is moved to the opposite side of the workpiece position W. The movable bell holder 4a is retracted from the work position W.

  Subsequently, as shown in FIG. 19, the lens 1 is arranged on the fixed bell holder 21a, the movable shaft stage 10 is moved downward, and the cylinder 9a is extended, so that the movable bell holder 4a is placed on the optical surface of the lens 1. The lens 1 is centered by contact.

  Subsequently, the space surrounded by the fixed bell holder 21a and the lens 1 is decompressed by a decompression mechanism (not shown), and the lens 1 is attracted to the fixed bell holder 21a while maintaining the centered state of the lens 1. Then, as shown in FIG. 20, after the movable bell holder 4 a is retracted upward, the intermediate bell holder 31 is disposed on the lens 1.

  Subsequently, as shown in FIG. 21, the movable bell holder 4 a is moved downward and inserted into the inner periphery of the intermediate bell holder 31. Here, since the end of the intermediate bell holder 31 is tapered, the movable bell holder 4 a enters the inner periphery of the intermediate bell holder 31 while adjusting the position of the intermediate bell holder 31. As a result, the center axis of the intermediate bell holder 31 coincides with the workpiece axis L1 and is in a centered state.

  Subsequently, as shown in FIGS. 22 and 23, the pressing plate 32a is moved in the direction of the work axis L1 by the horizontal movement mechanism 32b, and the notch 31a of the intermediate bell holder 31 is pressed from the periphery. Further, the pressing plate 32a is moved to the lower end of the notch 31a by the vertical movement mechanism 32c. Thereby, the intermediate bell holder 31 can be fixed in the centered state.

  Subsequently, as shown in FIG. 24, the movable bell holder 4 a is separated from the intermediate bell holder 31, and the lens 2 is disposed on the intermediate bell holder 31.

  Subsequently, as shown in FIG. 25, the movable bell holder 4 a is moved downward and brought into contact with the optical surface of the lens 2 to center the lens 2.

  Subsequently, as shown in FIG. 26, the pressing plate 32a is raised by the vertical movement mechanism 32c, and the pressing plate 32a is retracted to the outer peripheral side by the horizontal movement mechanism 32b.

  Further, as shown in FIG. 27, while the lenses 1 and 2 are held by the fixed bell holder 21a, the intermediate bell holder 31, and the movable bell holder 4a, the work shaft motor 11a is driven to rotate the lenses 1 and 2, and the grindstone shaft The motor 6b is driven to rotate the grindstone 6a. Then, the grindstone 6a is cut into the lenses 1 and 2 by the grindstone cutting stage 6d while the grindstone 6a is swung by the grindstone rocking stage 6c, whereby the outer peripheral surfaces 1a and 2a of the lenses 1 and 2 are ground. Do.

  After grinding the outer peripheral surfaces 1a and 2a by a desired amount, the grindstone 6a is retracted, and the rotation of the lenses 1 and 2 and the grindstone 6a is stopped. Then, the movable bell holder 4 a is retracted upward, and the lenses 1 and 2 are removed from the centering device 300.

  As described above, according to the third embodiment, since the intermediate bell holder 31 is centered using the movable bell holder 4a, a dedicated mechanism for centering the intermediate bell holder 31 becomes unnecessary. Therefore, the apparatus configuration can be simplified.

  Further, according to the third embodiment, since the centering device 300 is installed with the workpiece axis L1 oriented in the vertical direction, the lens 1, the intermediate bell holder 31, and the lens 2 can be arranged easily and stably. Therefore, the centering accuracy of the lenses 1 and 2 can be further improved, and highly accurate centering can be efficiently performed.

  Embodiments 1-3 described above are merely examples for carrying out the present invention, and the present invention is not limited to these. In addition, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the first to third embodiments. The present invention can be variously modified in accordance with specifications and the like, and various other embodiments are possible within the scope of the present invention.

1, 2 Lens 1a, 2a Outer peripheral surface 3a, 21a Fixed bell holder 3b, 21b Fixed shaft spindle 3c Fixed shaft housing 3d Fixed shaft gear 4a Movable bell holder 4b Movable shaft spindle 4c Movable shaft housing 4d Movable shaft gear 5, 31 Intermediate bell holder 6a Whetstone 6b Grinding wheel motor 6c Grinding wheel swing stage 6d Grinding wheel cutting stage 6e Outer peripheral surface 8 Base 9a Cylinder 9b Slider 10 Movable shaft stage 11a Work shaft motor 11b Work shaft gear 12a Transmission shaft fixed side gear 12b Transmission shaft 12c Transmission shaft housing 12d Transmission Shaft movable side gear 21a ', 21b' Air hole 21c Rotary joint 22 Upper telescopic mechanism 22a Support member 22b, 23b Telescopic part 23 Base side telescopic mechanism 23a Curved member 23c Projecting part 24 Support part 31a Notch 32 Intermediate bell holder support mechanism 32a Holding plate 32b Horizontal movement mechanism 32c Vertical movement mechanism 100, 200, 300 Centering device

Claims (13)

In the centering device for grinding the outer peripheral surface of the lens after centering the lens in which each of the two optical surfaces facing each other forms a spherical shape,
First and second bell holders arranged opposite to each other with their center axes aligned,
An intermediate bell holder that has a cylindrical shape, is arranged between the first and second bell holders, abuts against different lenses at both ends, and maintains the centered state of each lens after centering;
A centering device comprising: The first bell holder is disposed at a fixed position on the central axis;
The centering device according to claim 1, wherein the second bell holder is arranged to be movable along the central axis.   The apparatus further comprises pressure reducing means for reducing the pressure in the space surrounded by the first bell holder and the lens abutted on the first bell holder, thereby causing the lens to be attracted to the first bell holder. The centering device according to claim 2.   The centering device according to any one of claims 1 to 3, further comprising adjusting means for aligning a rotation center axis of the intermediate bell holder with the center axis.   The centering device according to any one of claims 1 to 3, wherein the second bell holder can be fitted to an inner periphery of the intermediate bell holder and can be removed from the intermediate bell holder.   6. The centering device according to claim 4, further comprising support means for supporting the intermediate bell holder in a state in which a rotation center axis of the intermediate bell holder is aligned with the central axis. A grindstone having a grinding surface capable of simultaneously grinding the plurality of lenses held by the first bell holder, the intermediate bell holder, and the second bell holder;
Driving means for rotating the grinding wheel;
The centering device according to claim 1, further comprising: A centering processing holder used in a centering device for grinding a peripheral surface of the lens after centering a lens in which each of two optical surfaces facing each other has a spherical shape,
A cylindrical shape, arranged between two bell holders arranged opposite each other with their center axes aligned, and in contact with different lenses at both ends, each centered lens is centered A holder for centering, characterized by maintaining. In a centering method of grinding an outer peripheral surface of the lens after centering a lens in which each of two optical surfaces facing each other forms a spherical shape,
The first lens is centered by bringing the tip ends of the first and second bell holders arranged opposite to each other so that their center axes coincide with each other to the two optical surfaces of the first lens. 1 centering process,
One end of a cylindrical intermediate bell holder is formed by separating the second bell holder from the other optical surface of the first lens while keeping one optical surface of the first lens in contact with the first bell holder. An intermediate bell holder disposing step that abuts the other optical surface of the first lens;
The second lens is centered by bringing the other end of the intermediate bell holder and the tip of the second bell holder into contact with the two optical surfaces of the second lens different from the first lens, respectively. A second centering step to be performed;
A centering method characterized by comprising:   The intermediate bell holder arranging step is executed by causing the first bell holder to be attracted to the first bell holder by decompressing the space surrounded by the first bell holder and the first lens. The centering method according to claim 9, wherein the centering method is performed.   The said intermediate | middle bell holder arrangement | positioning process directs the central axis of the said 1st and 2nd bell holder to a perpendicular direction, and mounts the said intermediate | middle bell holder on a said 1st lens, The Claim 9 or 10 characterized by the above-mentioned. How to get around.   12. The intermediate bell holder arranging step, wherein the second bell holder is fitted to the inner periphery of the intermediate bell holder so that the rotation center axis of the intermediate bell holder coincides with the center axis. How to get around.   The centering according to any one of claims 9 to 12, further comprising a grinding step of grinding the outer peripheral surfaces of the first and second lenses simultaneously after the second centering step. Method.

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