JP6897072B2 - Axle device and attachment for axis set device - Google Patents

Description

The present disclosure relates to an axis-aligning device for setting an attachment position (hereinafter, referred to as “axis-alignment position”) of a lens holding shaft that sandwiches and holds the spectacle lens with respect to the spectacle lens, and an attachment for the axis-alignment device.

In order to process the spectacle lens with high accuracy while being held by the lens holding shaft, the spectacle lens needs to be held at an appropriate position by the lens holding shaft. For example, in the apparatus described in Patent Document 1, a spectacle lens supported by three support pins is photographed by an imaging optical system, and a cup is attached to an appropriate position of the spectacle lens. The spectacle lens is processed with the lens holding shaft attached to the attached cup.

Japanese Unexamined Patent Publication No. 2013-212573

In the conventional axis-aligning device, it is common to support the spectacle lens by three support pins arranged so as to form the vertices of a triangle. However, in many cases, the spectacle lens is placed on the support pin with the center of the spectacle lens deviated from the center of the triangle in which the three support pins form the apex. In this case, the spectacle lenses mounted on the three support pins may be tilted, and a part of the spectacle lenses may come into contact with the support base provided with the support pins, resulting in unstable support of the spectacle lenses. .. If the support of the spectacle lens becomes unstable, the spectacle lens is not accurately held by the lens holding shaft, and the processing accuracy may decrease.

It is also conceivable to stabilize the support of the spectacle lens by increasing the number of support pins to four or more. However, simply increasing the number of support pins may not be suitable for spectacle lenses having various curves.

A typical object of the present disclosure is to provide an axis-aligning device and an attachment for the axis-aligning device capable of appropriately supporting an spectacle lens by a support pin.

The axis-aligning device provided by a typical embodiment in the present disclosure is an axis-aligning device that sets an axis-aligning position, which is an attachment position of a lens holding shaft that sandwiches and holds the lens during processing of the lens. A support base located below the spectacle lens and a first support pin, a second support pin, a third support pin, and a fourth support projecting upward from the support base to support the spectacle lens. When the first support pin, the second support pin, and the third support pin are arranged at positions forming the apex of a triangle, and the spectacle lens is not in contact with the support base. When all of the first support pin, the second support pin, and the third support pin are in contact with the spectacle lens and the spectacle lens is in contact with the support base, the first support pin and the second support are provided. The pin, and one of the third support pins and the fourth support pin come into contact with the spectacle lens.

The attachment for an axis alignment device provided by a typical embodiment in the present disclosure is an axis alignment that sets an axis alignment position, which is an attachment position of a lens holding shaft that sandwiches and holds the lens during processing of the lens. An attachment used in the device, the axis-aligning device projects upward from a support base located below the eyeglass lens and the support base to support the eyeglass lens, and each has a triangular apex. first support pin is disposed at a position forming the second support pins, and a third support pin, the attachment includes a base is a member serving as a base, to support the spectacle lens, from the base portion The fourth support pin projecting upward and the base portion formed into a shape corresponding to the positions and shapes of the first support pin, the second support pin, and the third support pin provided in the shafting device. It is provided with three fixing holes, and is detachably attached to the shafting device by passing the first support pin, the second support pin, and the third support pin through each of the three fixing holes. When the spectacle lens is not in contact with the support, all of the first support pin, the second support pin, and the third support pin are in contact with the spectacle lens, and the spectacle lens is in contact with the support. At least one of the first support pin, the second support pin, and the third support pin and the fourth support pin come into contact with the spectacle lens.

According to the shafting device and the attachment for the shafting device according to the present disclosure, the spectacle lens is appropriately supported by the support pin.

It is the figure which looked at the schematic structure of the shafting apparatus 1 from the right side. It is a top view and a front sectional view of a lens LE. It is a top view of the lens support mechanism 5. It is a right side view of the lens support mechanism 5. It is a top view of the lens support mechanism 5 when the lens LE is placed with the geometric center BC of the lens shape 28 aligned with the axis alignment position P. FIG. 5 is a cross-sectional view taken along the line MM in FIG. FIG. 5 is a cross-sectional view taken along the line NN in FIG. It is a perspective view of the attachment 50.

<Overview>
The shafting device illustrated in the present disclosure includes a support base and first to fourth support pins. The support base is located below the spectacle lens mounted on the shafting device. The first to fourth support pins project upward from the support base to support the spectacle lens. The first to third support pins are arranged at positions that form the vertices of a triangle. When the mounted spectacle lens is not in contact with the support base, all of the first to third support pins come into contact with the bottom surface of the spectacle lens to support the spectacle lens. When the mounted spectacle lens is in contact with the support, at least one (often only one) of the first to third support pins and the fourth support pin of the spectacle lens. It contacts the bottom surface to support the spectacle lens.

In an axis-aligning device that uses only three support pins, when a portion of the spectacle lens comes into contact with the support, the spectacle lens is often supported by only one of the three support pins and two of the support. It will be in a state of As a result, the support of the lens becomes unstable. On the other hand, in the centering device of the present disclosure, even if a part of the spectacle lens comes into contact with the support base, at least one of the first to third support pins (in many cases, only one) is used. The spectacle lens is supported by the fourth support pin and the support base. As a result, the spectacle lens is properly supported.

The techniques exemplified in the present disclosure can be applied to various devices. For example, the device to which the technique illustrated in the present disclosure can be applied may be a device that sets the axis alignment position by attaching a cup to the spectacle lens, or may be a device that sets the axis alignment by directly attaching the lens holding shaft to the spectacle lens. It may be a device for setting a position. Further, the device to which the technique illustrated in the present disclosure can be applied may be a device for setting the shafting position by marking a marking point at the shafting position.

The first to third support pins may be arranged at positions where they form the vertices of an equilateral triangle. The heights of the tips of the first to third support pins may be equal. In this case, the spectacle lenses of various shapes are stably supported by the first to third support pins in a state where the spectacle lens is not in contact with the support base.

However, the triangle formed by the vertices of the first to third support pins does not have to be an equilateral triangle. For example, the first to third support pins may be arranged at positions where their vertices form an isosceles triangle.

The fourth support pin may be arranged outside the triangle in which the first to third support pins form the apex. In this case, unlike the case where the fourth support pin is arranged inside the triangle, the fourth support pin comes into good contact with the spectacle lens when the spectacle lens comes into contact with the support base.

The fourth support pin may be arranged on a reference line that passes through the intermediate position of the two support pins of the first to third support pins and is perpendicular to the straight line passing through the two support pins. In this case, even if the mounted spectacle lens deviates in any direction with respect to the reference line, the fourth support pin easily comes into contact with the spectacle lens while the spectacle lens is in contact with the support base. Therefore, the spectacle lens is efficiently supported by the fourth support pin.

The term "on the reference line" does not limit the arrangement to be strictly on the reference line. In other words, the 4th support pin is slightly deviated from the reference line as long as the effect is that "the 4th support pin is easy to function regardless of the direction in which the spectacle lens is deviated from the reference line". May be good.

When the user wears the processed spectacle lens and looks at the front, the side located above the user's visual axis is the + y side of the spectacle lens, and the side located below the visual axis is the spectacle lens. The −y side of the lens, the direction of the visual axis is defined as the z direction of the spectacle lens, and the left-right direction that intersects the direction of the visual axis in the vertical direction is defined as the x direction. The first support pin and the second support pin may be arranged side by side in the x direction of the spectacle lens to be mounted. The fourth support pin is a straight line passing through an intermediate position between the first support pin and the second support pin, and is a reference line perpendicular to the straight line passing through the first support pin and the second support pin (hereinafter, "first reference line"). ") May be placed on top.

The geometric center of the lens shape is generally displaced in the left-right direction (x direction) from the optical center of the spectacle lens. Therefore, when the centering position is set to the geometric center of the lens shape, the spectacle lens is often placed in a state of being displaced in the left-right direction with respect to the support pin. For example, when the mounting position of the spectacle lens is shifted to the right, the spectacle lens is supported by two positions, a support base and a pin arranged on the left side of the first support pin and the second support pin. Here, if the fourth support pin is arranged on the left side of the first to third support pins, the fourth support pin cannot support the spectacle lens. The same problem occurs when the left and right sides are reversed. On the other hand, by arranging the fourth support pin on the first reference line, the fourth support pin can easily come into contact with the spectacle lens even if the mounting position of the spectacle lens is displaced in either the left or right direction.

The fourth support pin may be only one fourth support pin provided on the first reference line. In this case, the increase in the number of support pins is suppressed. As a result, for example, the possibility that the support pin adversely affects the imaging of the spectacle lens (including the imaging of the index projected on the spectacle lens) is suppressed.

However, it is also possible to change the position of the fourth support pin. For example, the fourth support pin is a straight line passing through an intermediate position between the second support pin and the third support pin, and a reference line perpendicular to the straight line passing through the second support pin and the third support pin (hereinafter, "second support pin"). It may be placed on the "reference line"). The fourth support pin is a straight line passing through an intermediate position between the third support pin and the first support pin, and is a reference line perpendicular to the straight line passing through the third support pin and the first support pin (hereinafter, "third support pin"). It may be placed on the "reference line").

It is also possible to change the number of fourth support pins. For example, a fourth support pin may be arranged on each of the second reference line and the third reference line. In this case, the number of the fourth support pins increases, but at least one of the fourth support pins comes into contact with the spectacle lens even if the mounting position of the spectacle lens is displaced in either the left or right direction.

The alignment device is at least one of mounting a cup on the spectacle lens, mounting a lens holding shaft, and assigning a marking point on the −y side of the center of the triangle in which each of the first to third support pins forms the apex. May be further provided with an axis-aligning means for pressing the lens from above. The spherical geometric center is often located on the −y side (lower side of the spectacle lens) of the optical center of the spectacle lens. Therefore, by centering on the −y side of the center of the triangle, the posture of the spectacle lens when centering on the geometric center is easily stabilized.

Further, the fourth support pin may be arranged at a position of the spectacle lens that contacts the first support pin and the second support pin on the −y side of the contact position. If a part of the spectacle lens is in contact with the support when the axis is aligned on the −y side of the center of the triangle, the −y side of the spectacle lens is pressed in the direction closer to the support during the axis alignment. Power works. On the other hand, since the fourth support pin is arranged on the −y side of the first support pin and the second support pin, the −y side of the spectacle lens is appropriately supported by the fourth support pin.

However, at least one of the position and the number of the fourth support pins may be changed depending on the position where the axis is centered and the like. For example, the fourth support pin may be arranged at a position where the first support pin and the second support pin come into contact with each other on the + y side, or may be arranged on both the + y side and the −y side. Good.

A virtual sphere that has the same radius of curvature as the rear surface of the spectacle lens whose lens curve value is the reference value, passes through the tips of the first to third support pins, and the center is located below the tips. To set. The height of the tip of the fourth support pin may be equal to or less than the height in contact with the virtual spherical surface. In this case, in a state where the spectacle lens whose rear lens curve value is equal to or less than the reference value is placed and the spectacle lens is not in contact with the support base, the first to third support pins are affected by the influence of the fourth support pin. There is no gap between either one and the rear surface of the spectacle lens. Therefore, many types of spectacle lenses are stably supported by the first to third support pins.

The height of the tip of the fourth support pin may be a height in contact with the virtual spherical surface. In this case, all of the first to fourth support pins come into contact with the spectacle lens whose rear lens curve value is the reference value, and the support is further stabilized.

The attachment for the shafting device illustrated in the present disclosure is provided with a fourth support pin and is detachably attached to a shafting device provided with the first to third support pins. Therefore, the spectacle lens is properly supported by the support pin only by attaching the attachment to the shafting device that does not have the fourth support pin.

<Embodiment>
Hereinafter, typical embodiments in the present disclosure will be described with reference to the drawings. A spectacle lens processing apparatus that processes a spectacle lens (hereinafter, also sometimes simply referred to as a “lens”) LE often processes the lens LE with the lens LE sandwiched from the front surface and the rear surface by a lens holding shaft. In the present embodiment, the cup mounting device for mounting the cup CU on which the lens holding shaft is mounted is mounted on the lens LE as the shafting device 1 for setting the mounting position of the lens holding shaft with respect to the lens LE (hereinafter, referred to as “axis alignment position”). Is illustrated. However, at least some of the techniques exemplified in this embodiment can be applied to devices other than cup mounting devices. For example, at least a part of the techniques exemplified in the present embodiment may be applied to a device for directly attaching the lens holding shaft to the lens LE without using the cup CU, a device for giving a mark at the axis alignment position in the lens LE, and the like. Applicable. The technique illustrated in the present embodiment can also be applied to a device that notifies the user of the determined axis alignment position by a monitor or the like without performing the mounting operation of the cup CU or the lens holding shaft or the like. Further, the spectacle lens processing apparatus may have a function of setting the axis alignment position. In this case, the spectacle lens processing device functions as an axis alignment device.

With reference to FIG. 1, the mechanical configuration of the shafting device 1 according to the present embodiment will be schematically described. FIG. 1 is a view of the schematic configuration of the shafting device 1 as viewed from the right. In FIG. 1, the front-back direction of the paper surface is the left-right direction (x direction) of the device, the left-right direction of the paper surface is the front-back direction (y direction) of the device, and the up-down direction of the paper surface is the up-down direction (z direction) of the device. Specifically, in FIG. 1, the front side of the paper (right side of the device) is the + x side, the back side of the paper (left side of the device) is the −x side, the right side of the paper (rear side of the device) is the + y side, and the left side of the paper (front side of the device). ) Is the −y side, the upper side of the paper surface (upper side of the device) is the + z side, and the lower side of the paper surface (lower side of the device) is the −z side.

The shafting device 1 of the present embodiment includes a main body 2, a lower overhanging portion 3, and an upper overhanging portion 4. The main body 2 is a box-shaped member extending in the vertical direction. The underhanging portion 3 projects forward from the lower part of the main body 2. The overhanging portion 4 projects forward from the upper part of the main body 2. A lens support mechanism 5 is provided on the upper part of the underhanging portion 3. The lens support mechanism 5 supports the lens LE at the tip end (upper end) of a plurality of support pins 7 (only the second support pin 7B, the third support pin 7C, and the fourth support pin 7D are shown in FIG. 1). .. Details of the lens support mechanism 5 will be described later.

The characteristic measurement mechanism 6 for measuring the characteristics of the lens LE will be described. The axis alignment device 1 of the present embodiment can measure the characteristics of the lens LE and set the axis alignment position based on the measurement result. The axis setting device 1 includes an illumination light source 10, a reflection mirror 11, a collimator lens 12, an index plate 13, and a photographing element 15.

The illumination light source 10 generates illumination light for illuminating the lens LE. As an example, the illumination light source 10 of the present embodiment is provided inside the overhanging portion 4. However, it is also possible to change the arrangement of the illumination light source 10. The reflection mirror 11 reflects the illumination light generated by the illumination light source 10 toward the lens LE. The collimator lens 12 uses the illumination light reflected by the reflection mirror 11 as a parallel luminous flux having a diameter larger than that of the lens LE. An index (for example, a ring index or the like) for detecting the optical center or the like of the lens LE is formed on the index plate 13. The index plate 13 of the present embodiment is provided on the upstream side of the optical path of the illumination light with respect to the lens LE (inside the overhanging portion 4 in the present embodiment). However, the index plate 13 may be provided in the optical path on the downstream side (photographing element 15 side) of the lens LE.

The image sensor 15 (for example, a CCD sensor or the like) receives the luminous flux of the illumination light that has passed through the lens 15. The image sensor 15 of the present embodiment is provided below the support base 6 in the lens support mechanism 5. At least a part of the support base 6 is formed by a transmitting member that transmits illumination light. As a result, the illumination light is received by the image sensor 15 provided below the support base 6. However, it is also possible to change the position of the image sensor 15. For example, a mirror may be installed below the lens LE, and the illumination light reflected by the mirror may be received by the image sensor 15. The refractive power of the lens LE, the position of the optical center, and the like are measured by the image captured by the image sensor 15.

As described above, the axis-aligning device 1 of the present embodiment measures the refractive power of the lens LE, the position of the optical center, and the like by projecting an index toward the lens LE and taking a picture with the image sensor 15. However, it is also possible to change the method of measuring the characteristics of the lens LE and the characteristics of the lens LE to be measured. For example, the axis alignment device 1 may detect the position of a stamp point previously assigned to the lens LE as a characteristic of the lens LE by photographing the lens LE with the image sensor 15. In this case, it is possible to omit the configuration of the index plate 13 and the like.

The shafting mechanism 20 will be described. As described above, the axis alignment mechanism 20 of the present embodiment sets the axis alignment position by attaching the cup CU to the lens LE. The shafting mechanism 20 includes a z-direction moving mechanism 21 and an arm 22. The z-direction moving mechanism 21 is provided inside the main body 2 and moves in the z-direction (vertical direction) by the power of a z-direction moving motor (not shown). However, the z-direction moving mechanism 21 may be moved in the vertical direction by a manual operation by the user. The arm 22 extends forward from the z-direction moving mechanism 21. A mounting portion 23 on which the cup CU is mounted is provided at the tip end portion of the arm 22. Inside the arm 22, a power transmission mechanism (for example, a belt) 25 for transmitting the power of the mounting portion rotation motor 24 to the mounting portion 23 is provided. When the mounting portion rotation motor 24 rotates, the mounting portion 23 rotates about the mounting central axis of the cup CU extending in the vertical direction.

In the present embodiment, the position in the xy direction in which the axis alignment is performed by the axis alignment mechanism 20 is predetermined. The relationship between the position in the xy direction in which the axis alignment is performed and the position of the plurality of support pins 7 will be described later. When the characteristics of the lens LE are measured by the characteristic measurement mechanism, the axis alignment mechanism 20 retracts the arm 22 from the optical path of the measurement light, but the description of this mechanism will be omitted.

With reference to FIG. 2, the relationship between the direction of the lens LE and the direction of the axis alignment device 1 will be described. In the present embodiment, the direction of the lens LE is defined with reference to the user's visual axis when the user wears the processed lens LE and looks at the front. Specifically, as shown in FIG. 2, the side located above the visual axis (upper side in the front view) is the + y side of the lens LE, and the side located below the visual axis (lower side in the front view). The −y side of the lens LE, the direction of the visual axis is defined as the Z direction of the lens LE, and the direction in which both the direction of the visual axis and the vertical direction intersect (that is, the left-right direction of the user) is defined as the x direction.

Further, as described above, in the present embodiment, the left-right direction of the shafting device 1 is defined as the x direction, the front-back direction of the shafting device 1 is defined as the y direction, and the vertical direction of the shafting device 1 is defined as the z direction. In the present embodiment, the operator who performs the work using the centering device 1 uses the lens support mechanism 5 of the centering device 1 so that the xyz direction of the centering device 1 and the xyz direction of the lens LE substantially coincide with each other. Place the lens LE. That is, the operator substantially matches the x direction (left-right direction) of the lens LE with the left-right direction of the axis alignment device 1. Further, the operator substantially aligns the y direction of the lens LE with the front-rear direction of the axis-aligning device 1. However, the xyz direction of the axis alignment device 1 and the xyz direction of the lens LE on which the lens LE is mounted do not have to be completely the same.

An example of a lens shape set in the lens LE will be described with reference to FIG. The lens mold 28 illustrated in FIG. 2 is a lens mold for the left eye of the user. The optical center OC of the lens LE shown in FIG. 2 is located at the center of the lens LE having a circular shape in a plan view. The geometric center BC of the lens shape 28 is generally displaced in the left-right direction from the optical center OC of the lens LE. Also in the example shown in FIG. 2, the geometric center BC is deviated from the optical center OC in the + x direction. Further, the geometric center BC of the lens shape 28 is generally located on the −y side (that is, below the visual axis of the user looking at the front) with respect to the optical center OC of the lens LE. The geometric center BC is obtained as the center of the lens shape 28 in the left-right direction (x direction) and the center in the up-down direction (y direction). For example, the center of the box (boxing center) when the ball shape 28 is surrounded by a square box may be obtained as the geometric center BC.

Further, the lens LE illustrated in FIG. 2 is a reference lens that serves as a reference for determining the arrangement and height of the plurality of support pins 7. As an example, in the present embodiment, a minus lens having a curve value of 7 curves on the rear surface (lower surface in the front sectional view), 4 curves on the front surface, and a diameter of 75 mm is used as a reference lens. However, it goes without saying that the curve value and diameter of the reference lens can be changed. For example, the type of lens in which the axis alignment device 1 frequently sets the axis alignment position may be used as the reference lens.

The lens support mechanism 5 in the alignment device 1 of the present embodiment will be described in detail with reference to FIGS. 3 to 7. As shown in FIGS. 3 and 4, the lens support mechanism 5 includes a support base 6 and a plurality of support pins 7. The support base 6 is located below the lens LE mounted on the lens support mechanism 5, and serves as a base for the lens support mechanism 5. The support base 6 in the present embodiment is formed in a disk shape having a flat upper surface. However, it is also possible to change the shape of the support base 6. For example, the upper surface of the support base 6 may be curved rather than flat. Concavities and convexities may be formed on the upper surface of the support base 6. The support base 6 does not have to be circular in a plan view.

The plurality of support pins 7 project upward from the support base 6 to support the lens LE. Hereinafter, the number, arrangement, height, and the like of the plurality of support pins 7 in the present embodiment will be described in detail.

In the present embodiment, four support pins 7 of a first support pin 7A, a second support pin 7B, a third support pin 7C, and a fourth support pin 7D are provided. The first support pin 7A, the second support pin 7B, and the third support pin 7C (hereinafter referred to as "first to third support pins 7") are mainly used when the lens LE is not in contact with the support base 6. Supports the lens LE. The fourth support pin 7D mainly reinforces the support of the lens LE when the lens LE is in contact with the support base 6.

As shown in FIG. 3, the first to third support pins 7 are arranged at positions forming the vertices of the virtual triangle 30. Therefore, unlike the case where the first to third support pins 7 are arranged side by side in a straight line, the lens LE is appropriately supported by the first to third support pins 7.

Specifically, the first to third support pins 7 of the present embodiment are arranged at positions each forming the apex of the virtual equilateral triangle 30. Further, as shown in FIG. 4, the heights H of the first to third support pins 7 are all equal. Therefore, lenses of various shapes are stably supported by the first to third support pins 7.

As shown in FIG. 3, the fourth support pin 7D is arranged outside the triangle 30 in which the first to third support pins 7 form the apex. Therefore, when the lens LE comes into contact with the support base 6 and one or two (often two) of the first to third support pins 7 are separated from the rear surface of the lens LE, the triangle 30 The fourth support pin 7D arranged on the outside contacts the rear surface of the lens LE to reinforce the support of the lens LE (details will be described later).

The right side view of FIG. 4 schematically shows a cross-sectional view of a reference lens LE supported without contacting the support base 6 with a vertical cross section passing through the center in the x direction. The curve VS in FIG. 4 shows a part of a virtual sphere for defining the height of the fourth support pin 7D. The virtual sphere has the same radius of curvature as the rear surface of the lens LE whose lens curve value is a reference value (7 curves in this embodiment). Further, the virtual spherical surface is in contact with the tips of the first to third support pins 7. Further, the center of the virtual spherical surface is located below the tips of the first to third support pins 7 (in the present embodiment, below the support base 6). As shown in FIG. 4, the height H'of the fourth support pin 7D is adjusted to be equal to or lower than the height in contact with the virtual sphere. Therefore, when the lens LE whose rear lens curve value is equal to or less than the reference value is mounted and the lens LE is not in contact with the support base 6, all of the first to third support pins 7 are on the rear surface of the lens LE. Contact. As a result, the support of the lens LE by the first to third support pins 7 is stable.

Specifically, the fourth support pin 7D in the present embodiment is adjusted to a height in contact with the virtual spherical surface. Therefore, the lens LE whose rear lens curve value is the reference value contacts all of the first support pin 7A, the second support pin 7B, the third support pin 7C, and the fourth support pin 7D, and is more stable. Be supported.

When the lens curve value on the rear surface of the lens LE is larger than the reference value, the fourth support pin 7D can contact the rear surface of the lens LE even if the lens LE is not in contact with the support base 6. However, in this case, the lens LE is formed by two of the first to third support pins 7 (in this embodiment, the first support pin 7A and the second support pin 7B) and the fourth support pin 7D. Is supported. Therefore, even when the lens curve value on the rear surface of the lens LE is larger than the reference value, the stability of the support of the lens LE does not significantly decrease.

The position of the fourth support pin 7D will be described in detail with reference to FIG. A straight line that passes through the intermediate positions of the two support pins 7 of the first to third support pins 7 and that passes through the two support pins 7 is defined as a reference line. There are three reference lines. The fourth support pin 7D of the present embodiment is arranged on at least one of the reference lines. Therefore, even if the lens LE mounted on the lens support mechanism 5 deviates in any direction with respect to the reference line, the fourth support pin 7D is likely to come into contact with the lens LE. When the fourth support pin 7D is provided on the reference line, it is not necessary that the fourth support pin 7D is strictly arranged on the reference line, and the fourth support pin 7D may be slightly deviated from the reference line.

Specifically, in the present embodiment, the first support pin 7A and the second support pin 7B are arranged side by side in the x direction. As described above, the operator places the lens LE on the lens support mechanism 5 so that the left-right direction of the lens LE and the x-direction of the axis-aligning device 1 substantially coincide with each other. That is, the direction in which the first support pin 7A and the second support pin 7B are lined up (x direction in the axis alignment device 1) substantially coincides with the x direction of the lens LE on which the lens LE is mounted. The reference line perpendicular to the straight line 32 that passes through the intermediate position 31 between the first support pin 7A and the second support pin 7B and passes through both the first support pin 7A and the second support pin 7B is defined as the first reference line K1. .. The fourth support pin 7D of the present embodiment is arranged on the first reference line K1.

More specifically, the axis alignment mechanism 20 (see FIG. 1) in the present embodiment is above the center TC of the triangle 30 in which each of the first to third support pins 7 forms an apex at a position P on the −y side. Axis is performed from (+ z direction). The fourth support pin 7D of the present embodiment is arranged at a position of the lens LE that contacts the first support pin 7A and the second support pin 7B on the −y side of the contact position. In other words, the fourth support pin 7D of the present embodiment is arranged on the −y side of the first reference line K1 with respect to the first support pin 7A and the second support pin 7B in the shafting device 1.

FIG. 5 shows a state in which the lens LE is mounted so that the geometric center BC of the lens shape 28 is aligned with the axis alignment position P. As described above, the geometric center BC of the lens shape 28 is generally displaced in the left-right direction from the optical center OC of the lens LE. Therefore, when the geometric center BC is aligned with the axis alignment position P, the lens LE is often placed in a state of being displaced in the left-right direction with respect to the center TC of the first to third support pins 7. For example, in the example shown in FIG. 5, the optical center OC of the mounted lens LE is shifted to the left with respect to the center TC of the first to third support pins 7. Here, assuming that the fourth support pin 7D'is arranged on the right side of the first to third support pins 7, the fourth support pin 7D'cannot support the lens LE. On the other hand, in the present embodiment, the fourth support pin 7D is arranged on the first reference line K1 extending in the y direction. Therefore, the fourth support pin 7D is likely to come into contact with the lens LE even if the lens LE is displaced in either the left or right direction. Further, only one fourth support pin 7D in the present embodiment is provided on the first reference line K1. Therefore, the axis-aligning device 1 of the present embodiment can efficiently support the lens LE while suppressing an increase in the number of support pins 7.

Further, as described above, the geometric center BC of the lens shape 28 is often located on the −y side (lower side in the lens LE) of the optical center OC of the lens LE. Therefore, for example, if the center TC of the first to third support pins 7 and the axis alignment position P match, when the geometric center BC is aligned with the axis alignment position P, the first to third support pins 7 The amount of deviation of the lens LE with respect to the center TC in the + y direction becomes large. On the other hand, in the present embodiment, the alignment is performed at the position P on the −y side of the center TC of the triangle 30 in which each of the first to third support pins 7 forms the apex. Therefore, even when the geometric center BC is aligned with the axis alignment position P, the support of the lens LE is unlikely to become unstable.

Further, when the axis is centered at the position P on the −y side of the center TC of the first to third support pins 7, a part of the lens LE (position of reference numeral “40” in FIG. 5) is the support base 6. When it is in contact with the lens LE, a force that presses the −y side of the lens LE toward the support base 6 acts. On the other hand, in the present embodiment, the fourth support pin 7D is arranged on the −y side of the shafting device 1 with respect to the first support pin 7A and the second support pin 7B in the first reference line K1. Therefore, the −y side of the lens LE, which is pressed toward the support base 6, is appropriately supported by the fourth support pin 7D.

The stability of the support of the lens LE by the plurality of support pins 7 will be described with reference to FIGS. 5 to 7. In the state shown in FIGS. 5 to 7, the position 40 of the lens LE is in contact with the support base 6. As a result, of the first to third support pins 7, only the second support pin 7B is in contact with the rear surface of the lens LE (the first support pin 7A and the third support pin 7C are from the lens LE. Are separated). In this way, when the lens LE comes into contact with the support base 6, in many cases, only one of the first to third support pins 7 comes into contact with the lens LE. The MM line in FIG. 5 is a straight line passing through the second support pin 7B and the position 40. FIG. 6 is a cross-sectional view taken along the line MM in the direction of arrow. The NN line in FIG. 5 is a straight line passing through the second support pin 7B and the fourth support pin 7D. FIG. 7 is a cross-sectional view taken along the line NN in the direction of arrow.

As shown in FIG. 6, when only one of the first to third support pins 7 is in contact with the lens LE, if the fourth support pin 7D is not provided, it contacts the support base 6. The position 40 of the lens LE fluctuates. As a result, the support of the lens LE becomes unstable. However, as shown in FIG. 7, in the present embodiment, in addition to one of the first to third support pins 7 and the position 40, the fourth support pin 7D comes into contact with the lens LE. As a result, the lens LE is supported at three points, and the support of the lens LE is stabilized.

The techniques disclosed in the above embodiments are merely examples. Therefore, it is possible to modify the techniques exemplified in the above embodiments. For example, in the above embodiment, all of the first support pin 7A, the second support pin 7B, the third support pin 7C, and the fourth support pin 7D are provided in advance in the shafting device 1. However, it is also possible to use an attachment attached to a shafting device provided with only the first to third support pins 7.

An example of the attachment for the shafting device will be described with reference to FIG. The attachment 50 illustrated in FIG. 8 includes a base 51, fixing holes 55A, 55B, 55C, and a fourth support pin 7D. The base 51 is a member that serves as a base for the attachment 50. As an example, the base 51 of the attachment 50 illustrated in FIG. 8 is formed in a disk shape. However, it goes without saying that the shape of the base 51 can be changed. In the present embodiment, when the attachment 50 is attached to the shafting device, the base 51 of the attachment 50 becomes a part of the support base in the shafting device. The fourth support pin 7D projects upward from the base 51. The three fixing holes 55A, 55B, 55C are formed in the base 51 in a shape corresponding to the positions and shapes of the first to third support pins 7 provided in the shafting device. The operator can attach the attachment 50 to an appropriate position of the shafting device by passing the first to third support pins 7 through each of the three fixing holes 55A, 55B, and 55C. However, it goes without saying that the method of attaching the attachment 50 to the shafting device can be changed.

By mounting the attachment 50 illustrated in FIG. 8 on the shafting device, the arrangement of the plurality of support pins 7 becomes the same as that of the above embodiment. Therefore, even in the shafting device not provided with the fourth support pin 7D, the lens LE is appropriately supported by the plurality of support pins 7 only by attaching the attachment 50.

It is also possible to make other changes to the above embodiment. For example, in the above embodiment, the lens LE is placed so that the x direction (left-right direction) of the lens LE and the x direction (left-right direction) of the axis-aligning device 1 coincide with each other. However, it goes without saying that the relationship between the direction of the lens LE and the direction of the axis alignment device 1 may be changed. For example, the operator may mount the lens LE on the lens support mechanism 5 so that the x direction (left-right direction) of the lens LE and the front-rear direction of the axis-aligning device 1 substantially coincide with each other. In this case, the positions of the plurality of support pins 7 may be changed according to the relationship between the direction of the lens LE and the direction of the axis alignment device 1.

1 Axis Alignment Device 5 Lens Support Mechanism 6 Support Base 7A 1st Support Pin 7B 2nd Support Pin 7C 3rd Support Pin 7D 4th Support Pin 20 Axis Alignment Mechanism 28 Ball 30 Triangle 31 Intermediate Position 32 Straight Line 50 For Axis Alignment Device Attachments 55A, 55B, 55C Fixing holes

Claims (4)

It is an axis-aligning device that sets the axis-alignment position, which is the mounting position of the lens-holding shaft that sandwiches and holds the spectacle lens during processing of the spectacle lens, with respect to the spectacle lens.
A support base located below the spectacle lens and
A first support pin, a second support pin, a third support pin, and a fourth support pin that project upward from the support base to support the spectacle lens.
With
The first support pin, the second support pin, and the third support pin are arranged at positions forming the vertices of a triangle.
When the spectacle lens is not in contact with the support, all of the first support pin, the second support pin, and the third support pin are in contact with the spectacle lens.
When the spectacle lens is in contact with the support base, at least one of the first support pin, the second support pin, and the third support pin and the fourth support pin are in contact with the spectacle lens. A shafting device characterized by. The shafting device according to claim 1.
The first support pin, the second support pin, and the third support pin are arranged at positions forming the vertices of an equilateral triangle, and the heights of their respective tips are equal. .. The shafting device according to claim 1 or 2.
The fourth support pin is an axis-aligning device characterized in that the first support pin, the second support pin, and the third support pin are arranged outside the triangle forming the apex. It is an attachment used for an axis-aligning device that sets the axis-alignment position, which is the mounting position for the spectacle lens, of the lens holding shaft that sandwiches and holds the spectacle lens during processing of the spectacle lens.
The shafting device is
A support base located below the spectacle lens and
It is provided with a first support pin, a second support pin, and a third support pin, each of which projects upward from the support base to support the spectacle lens and is arranged at a position forming the apex of a triangle.
The attachment is
The base, which is the base member,
A fourth support pin projecting upward from the base to support the spectacle lens ,
At the base, three fixing holes formed in a shape corresponding to the positions and shapes of the first support pin, the second support pin, and the third support pin provided in the shafting device, and
The first support pin, the second support pin, and the third support pin are passed through each of the three fixing holes so that they can be detachably attached to the shafting device.
When the spectacle lens is not in contact with the support, all of the first support pin, the second support pin, and the third support pin are in contact with the spectacle lens.
When the spectacle lens is in contact with the support base, at least one of the first support pin, the second support pin, and the third support pin and the fourth support pin are in contact with the spectacle lens. An attachment for a shafting device that features.

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