JP4353218B2 - Lens polishing equipment - Google Patents

Description

  The present invention relates to a lens polishing apparatus having a pressure mechanism for pressing a lens against a polishing dish.

  2. Description of the Related Art Conventionally, there is known a lens polishing apparatus that polishes a lens by bringing the lens into surface contact with a rotating polishing dish and pressurizing and swinging on a spherical axis of the polishing dish. This lens polishing apparatus is a spherical core polishing apparatus that rotates and rotates a polishing dish and presses and swings a lens attached to a curved surface (R surface) with a pressure shaft. It has been.

With respect to such a spherical core polishing apparatus, there is one having a pressure member and a rocking member that transmits a rocking motion to the pressure member, and an elastic coupling member that applies pressure to the lens by bending. (See Patent Document 1).
JP 2001-138199 A

  However, the spherical core polishing apparatus described in Patent Document 1 uses a leaf spring to connect a pressure member and a swing member, and uses a leaf spring as an elastic member for pressurization, or uses a leaf spring and a coil spring in combination. It is used.

  FIG. 5 is a diagram schematically illustrating the configuration of the pressure block and the pressure shaft holder of the spherical core polishing apparatus described in Patent Document 1. FIG. In the figure, 50 is a pressure block, 51 is a pressure shaft holder, 52 is a leaf spring, and 53 is a pressure shaft.

  If the plate spring 52 is not bent as shown in FIG. 6A, and the plate spring is bent for pressurization as shown in FIG. 4B, the total length of the plate spring does not change. The axis of the pressure shaft 53 is displaced as shown in FIG.

  If the pressing shaft 53 is not accurately directed toward the spherical core of the polishing dish, the entire lens cannot be pressed evenly, causing a problem such as uneven wear, and this deviation is caused with respect to the diameter particularly when polishing a small-diameter lens. The ratio of misalignment increases, which is a problem that cannot be ignored.

  In recent years, there has been an increasing demand for polishing a very small diameter lens. However, when polishing a thin lens with a small diameter, an excessive pressure cannot be applied, and a very small pressure can be finely adjusted. There is a need.

  Further, the spherical core polishing apparatus described in Patent Document 1 uses a leaf spring as an elastic member for pressurization, and connects the pressurization member and the swinging member. It is necessary for the pressure block to be lifted with a finger by a person, it is difficult to work, there is a risk of damaging the polishing plate surface with a lens to be attached and detached, and the leaf spring is bent with the finger, causing a load on the operator's finger There is.

  In view of the above problems, the present invention does not move the axis of the pressurizing shaft at the time of pressurization, and can always point the axis of the pressurizing shaft accurately to the spherical core of the polishing dish, and is very small. It is possible to finely adjust the pressing force, which makes it possible to polish the lens with high accuracy, and to obtain a lens polishing apparatus with good workability and work efficiency when attaching and detaching the lens and replacing the polishing dish. It is what.

  The above object is achieved by the invention described below.

1. In a lens polishing apparatus for polishing a lens by bringing a lens into surface contact with a rotating polishing dish and pressurizing and swinging on a spherical axis of the polishing dish, at least a pressure shaft and the pressure shaft with an inner diameter A radial ball bearing or a radial roller bearing that is slidably fitted in the axial direction; and a support member that supports the pressure shaft so as to be rotatable and slidable in the axial direction via the radial ball bearing or the radial roller bearing. A pressure mechanism having a biasing member disposed along the sliding direction of the pressure shaft in the support member and biasing the pressure shaft in the axial direction; and The urging force of the member is transmitted to the lens via the pressure shaft and the lens is pressed by the urging force of the urging member via the pressure shaft. Against the polishing dish Lens polishing apparatus characterized by comprising: a retracted position releasing the pressure condition, and a holding member for rotatably holding between.
2. 2. The lens polishing apparatus according to 1, wherein the urging member is provided so as to press a pressure rod provided via a hard ball that makes point contact with an end of the pressure shaft.

3. 3. The lens polishing apparatus according to 1 or 2 , further comprising an elevating mechanism that elevates and lowers the polishing dish in the rotation axis direction.

4). The lens polishing apparatus according to any one of claims 1 to 3 , wherein the urging member is a coil spring, and an axis of the pressure shaft is located inside a winding diameter of the coil spring.

5). The lens polishing apparatus according to any one of claims 1 to 4 , further comprising an adjustment member that adjusts an urging force of the urging member.

6). The lens polishing apparatus according to any one of claims 1 to 5 , wherein the biasing member is replaceable.

7). The lens polishing apparatus according to any one of claims 1 to 6 , further comprising a length measuring device for measuring the axial movement of the pressure shaft.

  According to the present invention, during pressurization, the axis of the pressurizing shaft does not move, and the axis of the pressurizing shaft can always be accurately directed to the center of the polishing dish, and a very small pressing force can be applied. It can be finely adjusted, which makes it possible to polish a lens with a small diameter with high precision. In addition, it is possible to obtain a polishing device with good workability and work efficiency when attaching and detaching lenses and changing the polishing dish. It becomes.

  Hereinafter, the present invention will be described in detail with reference to embodiments, but the present invention is not limited thereto.

  Hereinafter, the overall configuration of the polishing apparatus 100 according to the present embodiment will be described with reference to FIGS. 1 and 2.

  FIG. 1 is a side view schematically showing the outline of the overall configuration of the polishing apparatus 100 according to the present embodiment. FIG. 2 is a front view schematically showing an outline of the lens polishing section of the polishing apparatus 100 according to the present embodiment. In FIGS. 1 and 2, details are omitted.

  1 and 2, 1 is a lens, 1a is a lens holder, 2 is a polishing dish, 3 is a dish shaft, 3a is a spindle and functions as a polishing dish holding member, and the polishing dish 2 is detachably attached to the spindle 3a. It has been. The spindle 3a is rotated by the rotation of the plate shaft motor 5 transmitted through the pulley 5a and the flat belt 5b. 3c is a dish axis raising / lowering dial. By rotating the dish axis raising / lowering dial 3c, the spindle 3a can be moved up and down by a rack and pinion mechanism (elevating mechanism), and the dish axis 3 can be moved in the direction of the rotation axis. By operating the dish shaft elevating dial 3c, the ball center of the polishing dish 2 and the swing center of a pressurizing mechanism to be described later can be matched. The dish shaft lifting mechanism may use an eccentric cam mechanism or the like.

  Reference numeral 4a denotes a pressure shaft, and the support member 4 supports the pressure shaft 4a. Reference numeral 4b denotes a dial gauge which is a length measuring device, supported by the support member 4, and in the axial direction of the pressurizing shaft 4a generated when the ball center of the polishing dish 2 and the swinging center of a pressurizing mechanism described later do not coincide. It is provided to measure the amount of movement. The pressing shaft 4 a is set so that its axial direction is directed toward the center of the polishing dish 2.

  The support member 4 is held by the holding member 6, and the rotation of the swing shaft motor 8 is transmitted via a crank mechanism 8 a that converts the rotational motion of the swing shaft motor 8 into the swing motion. 1 is swung in the front and back direction of the paper surface in FIG. 1, and in the direction of the arrow in FIG.

  That is, the polishing dish 2 rotates about the spindle 3a, and the support member 4 and the lens 1 that support the pressure shaft 4a, and the lens holder 1a swing around the axis passing through the center of the polishing dish 2 as the swing center. The lens 1 is polished. When the swing axis that is the swing center is deviated with respect to the ball center of the polishing dish 2, the pointer of the dial gauge 4b swings during the swing, and the center of the polishing dish 2 and the swing that is the swing center are swung. When the axes coincide with each other, the dial gauge 4b is stopped when swinging. That is, when the dial gauge 4b is swinging at the time of swinging during setup, the countershaft lifting dial 3c is turned to adjust the dial gauge 4b so that the pointer stops. A state in which the rocking shaft, which is the rocking center, coincides, that is, a state of ball center polishing is obtained.

  In addition, when a deviation occurs between the swing shaft and the ball center due to abrasion of the polishing dish 2 due to repeated polishing, the dial gauge 4b can be always confirmed by the swing of the pointer of the dial gauge 4b. By raising the polishing dish 2 by 3c, the swinging shaft and the spherical center can be easily matched, and the polishing dish 2 can be returned to the spherical polishing state without removing it from the polishing apparatus.

  Reference numeral 9 denotes a swing position / swing width confirmation plate for confirming the swing position / swing width of the support member 4 and is fixed without swinging.

  Further, the holding member 6 is pressed by a spring 6a which is a pressing member, and is positioned by the stopper 6b at a position where the center line of the holding member 6 and the center line of the swing shaft are parallel to each other. It becomes. The pressing force by the spring 6a is applied to the stopper 6b and does not become the pressing force to the lens of the pressing shaft 4a.

  Further, the holding member 6 that holds the support member 4 is a polishing position (a state indicated by a solid line in FIG. 1) that presses the lens 1 against the polishing dish 2 and a retreat that releases the pressing state of the lens 1 against the polishing dish 2. The position (indicated by the broken line in FIG. 1) can be rotated about the rotation shaft 10 so as to improve workability when the lens 1 is attached or detached or the polishing plate 2 is replaced. It has become.

  The above is the outline of the lens polishing apparatus 100 according to the present embodiment. Hereinafter, the pressure shaft 4a and the periphery of the support member 4 will be described in more detail.

  FIG. 3 is a cross-sectional view showing the pressurizing mechanism around the pressurizing shaft 4a and the support member 4 constituting the polishing apparatus 100 according to the present embodiment. In addition, in the following figures, in order to avoid duplication of description, the same reference numerals are given to the same function members.

  As shown in the figure, the support member 4 is formed in a cylindrical shape, and a pressure shaft 4 a is accommodated inside the support member 4. As shown in the figure, the pressure shaft 4a is supported via two bearings 41, and is fitted in an inner diameter portion of the bearing 41 so as to be slidable in the arrow A direction. As this bearing 41, a radial ball bearing, a radial roller bearing, or the like is applied. That is, the pressure shaft 4a is supported by the support member 4 so as to be rotatable about the axis and slidable in the axial direction.

  Thus, by supporting the pressurizing shaft 4a through the bearing 41 in the support member 4, the pressurizing shaft 4a can rotate with the resistance in the radial direction reduced as much as possible. When the lens is driven to rotate by rotation, the resistance in the rotation direction of the lens can be reduced as much as possible, and the pressurizing shaft 4a is fitted to the inner diameter of the bearing 41 so as to be slidable in the axial direction, thereby stabilizing the bearing 41. By using the inner diameter with high accuracy for sliding, it is possible to perform sliding operation with low load resistance with low cost and no play, and the load resistance applied to the lens by the pressure shaft 4a during polishing is determined by the rotation direction and thrust direction of the lens. In both cases, the load resistance can be reduced, and the lens surface to be polished can be finished with high accuracy.

  The tip of the pressure shaft 4a can be exchanged, and not only a sharp shape as shown in the figure but also an appropriate shape according to the lens holder 1a.

  The end of the pressing shaft 4a on the dial gauge 4b side in the sliding direction is provided with a pressing rod 43 via a hard ball 42 for point contact, and the pressing rod 43 is provided by a compression coil spring 44 as an urging member. It is pressed. This pressing force is a pressure applied to the lens to be polished by the pressing shaft 4a. Further, as shown in the figure, the axis of the pressure shaft 4 a is located inside the winding diameter of the compression coil spring 44.

  A male screw is formed in the range B in the outer peripheral portion of the support member 4, and a female screw member 46 as a member for adjusting the pressing force of the compression coil spring 44 is screwed into the male screw. The female screw member 46 is in contact with a receiving member 45 that receives one end of the compression coil spring 44. As a result, the female screw member 46 is rotated with respect to the support member 4 and the receiving member 45 is moved within the range B shown in the figure, whereby the receiving member 45 and the other end of the compression coil spring 44 of the pressure rod 43 are received. The distance from the part can be adjusted. As a result, the pressure applied from the pressure rod 43, that is, the compression coil spring 44 of the pressure shaft 4a, can be delicately adjusted from a fine pressure to a large pressure. Further, since the weights of the support member 4 and the holding member 6 are all absorbed by the stopper 6b, only the pressure applied from the compression coil spring 44 to the pressure shaft 4a is transmitted to the lens to be polished. The dial gauge 4b is arranged so that the contact of the dial gauge 4b abuts against the pressure rod 43 and the movement of the pressure rod 43, that is, the pressure shaft 4a in the axial direction can be measured.

  The compression coil spring 44 can be appropriately replaced with one having a different wire diameter, number of turns, etc. by removing the dial gauge 4b, the female screw member 46 and the receiving member 45. By making it replaceable in this way, an appropriate urging force can be applied according to the lens.

  As described above, the compression coil spring 44 and the pressure shaft 4a are arranged in series in the support member 4 along the sliding direction of the pressure shaft 4a, and the pressure shaft 4a is the compression coil spring. The pressure shaft 4a is urged by only 44, and the pressure shaft 4a is supported via a bearing so that the pressure shaft 4a can be rotated and slid. The pressure can be transmitted in a balanced manner to the axis of the pressure shaft 4a, and even if the pressure is changed, the axis of the pressurizing shaft 4a can be accurately directed to the spherical core of the polishing dish without causing a shift or shaking, Furthermore, by adjusting the female screw member 46, a very small pressing force can be adjusted in a fine increment, thereby obtaining a pressure mechanism of a lens polishing apparatus capable of polishing a lens with high accuracy. The support member 4 also has a function of a cover for preventing the inflow of polishing liquid and the inflow of foreign matters when the series of internal members are polished.

  FIG. 4 is a diagram illustrating an example of a rotation mechanism of the holding member 6 that holds the support member 4. This figure shows the state of the polishing position indicated by the solid line in FIG. 1 where the support member 4 presses the lens against the polishing dish.

  In this figure, the holding member 6 holding the support member 4 is pivotally supported by a rotating shaft 10 and is pressed by a spring 6a so as to come into contact with the stopper 6b and be in a polishing position.

  The lever fixing member 62 to which the operation lever 61 is fixed is pivotally supported by the shaft 63. Further, the rod member 64 supporting the spring 6 a is pivotally supported on a shaft 65 formed on the lever fixing member 62. One end of the bar member 64 passes through a sleeve member 66 that is rotatably assembled to the holding member 6, and is prevented from being detached by a retaining member 67.

  By the penetrating engagement of the rod member 64 and the sleeve member 66, the lever fixing member 62 and the holding member 6 are mechanically interlocked. When the operation lever 61 is rotated in the direction indicated by the arrow from the illustrated state, the lever fixing member 62 and the rod member 64 are rotated about the shaft 63 as a pivot shaft, and the penetrating engagement between the rod member 64 and the sleeve member 66 is achieved. Thus, the holding member 6 is also rotated in the direction of the arrow shown in the drawing with the rotation shaft 10 as the rotation shaft.

  That is, it rotates around the rotation shaft 10 between a polishing position where the lens is pressed against the polishing dish and a retracted position (state indicated by a broken line in FIG. 1) where the pressing state of the lens against the polishing dish is released. It can be made to.

  Thereby, when attaching and detaching the lens and exchanging the polishing dish, the support member 4 can be easily retracted to the retracted position where the pressing state of the lens against the polishing dish is released, and the holding member is returned when the lens is returned to the polishing position. By bringing 6 into contact with the stopper 6b, the state of the polishing position before retraction can be reproduced, that is, the axis of the pressurizing shaft can be accurately directed to the spherical core of the polishing dish and high-precision polishing. Therefore, it is possible to obtain a polishing apparatus with good workability.

  In the above description, an example in which the holding member 6 is rotated using a so-called toggle clamp mechanism has been described. However, the present invention is not limited to this, and a tumbler mechanism or the like may be used.

It is the side view which showed typically the outline | summary of the whole structure of the grinding | polishing apparatus which concerns on this Embodiment. It is the front view which showed typically the outline | summary of the lens grinding | polishing part of the grinding | polishing apparatus which concerns on this Embodiment. It is sectional drawing which shows the pressurization mechanism of the pressurization shaft and support member periphery which comprises the grinding | polishing apparatus which concerns on this Embodiment. It is a figure which shows an example of the rotation mechanism of the holding member holding a support member. It is the figure which showed typically the structure of the pressurization block and pressurization shaft holder of the conventional spherical core grinding | polishing apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lens 1a Lens holder 2 Polishing plate 3 Plate shaft 3a Spindle 3c Plate shaft lifting dial 4 Support member 4a Pressure shaft 4b Dial gauge 5 Plate shaft motor 5a Pulley 5b Flat belt 6 Holding member 6a Spring 6b Stopper 8 Oscillation shaft motor 8a Crank mechanism 100 Polishing device

Claims (7)

In a lens polishing apparatus for polishing a lens by bringing the lens into surface contact with a rotating polishing dish and pressurizing and swinging on the spherical axis of the polishing dish,
At least a pressure shaft, a radial ball bearing or radial roller bearing that slidably fits the pressure shaft in the axial direction with an inner diameter, and the pressure shaft is rotated via the radial ball bearing or radial roller bearing. And a support member that is slidably supported in the axial direction, and a biasing member that is disposed along the sliding direction of the pressure shaft in the support member and biases the pressure shaft in the axial direction. A pressure mechanism;
A polishing position in which the urging force of the urging member is transmitted to the lens via the pressure shaft and presses the lens against the polishing dish, and the pressure mechanism via the pressure shaft. A lens polishing apparatus, comprising: a retracting position in which a pressing state of the lens against the polishing dish by an urging force of the urging member is released; and a holding member that rotatably holds the lens. The lens polishing apparatus according to claim 1, wherein the urging member is provided so as to press a pressure rod provided via a hard ball that makes point contact with an end of the pressure shaft. The lens polishing apparatus according to claim 1, further comprising an elevating mechanism that elevates and lowers the polishing dish in a rotation axis direction. The lens polishing apparatus according to any one of claims 1 to 3, wherein the biasing member is a coil spring, and an axis of the pressure shaft is located inside a winding diameter of the coil spring. The lens polishing apparatus according to claim 1, wherein an adjustment member that adjusts an urging force of the urging member is provided. The lens polishing apparatus according to claim 1, wherein the urging member is replaceable. The lens polishing apparatus according to any one of claims 1 to 6, further comprising a length measuring device that measures the movement of the pressure shaft in the axial direction.

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