JP2012201052A - Position detector for plastic lens mold - Google Patents

Abstract

PROBLEM TO BE SOLVED: To rapidly specify a target position of an injection port formed to a tape of a mold assembly with high accuracy.SOLUTION: This position detector includes the detection part 21 facing the mold assembly 2 and a moving device for moving at least either one of the detection part 21 and the mold assembly 2 in the axial direction of the mold assembly 2 with respect to the other one of them. A position specifying part 23 for specifying the target position of the injection port 6 of the tape 5 is provided on the basis of the detection result of the detection part 21. A mold member and the tape 5 are formed of a light transmitting material, and the detection part 21 has a light emitting element 24 and a light receiving element 25 allowing a light path 26 thereof to traverse the mold assembly 2 in the direction crossing the axial direction at a right angle. The position specifying part 23 detects an end edge of a mold member using the light transmittance when the light path 26 traverses the mold member and the light transmittance when the light path 26 traverses the tape 5, and specifies the target position on the basis of the position of the end edge.

Description

  The present invention relates to a position detection device for a plastic lens mold used for specifying an injection port formation position of a plastic lens mold.

  Conventional plastic lenses for spectacles are generally formed by cast polymerization. This casting polymerization is a method in which a plastic lens material is injected into a mold and cured by heat or energy such as ultraviolet rays to obtain a molded product. A mold used for cast polymerization is described in Patent Document 1, for example.

The mold disclosed in Patent Document 1 includes a mold assembly in which a lens molding cavity is formed, and an injection assisting member bonded to the mold assembly. The mold assembly is composed of a pair of disk-shaped mold members that are molds for lens surface molding, and a tape that is wound around the outer periphery of these mold members so as to be a mold for edge surface molding. Yes. The tape has an injection port for injecting a plastic lens material.
The position of the injection port is determined for each mold, and is often formed manually by an operator. A nozzle for supplying a plastic lens material is inserted into the injection port through the injection auxiliary member.

International Publication WO 2010/098466

  However, when the operator manually forms the injection port on the tape, it is difficult to specify the position where the injection port is formed (hereinafter simply referred to as the target position), and the work time becomes longer than necessary. The position of the inlet could be inaccurate. If the injection port is not formed at the correct position, the nozzle for injecting the plastic lens material is likely to hit the tape, and if the nozzle hits the tape, the nozzle cannot be correctly inserted into the mold.

  Further, if the position of the injection port is not correct, an excessively wide gap may be formed between the nozzle and the injection port when the plastic lens material is injected into the mold assembly. In such a case, bubbles are easily mixed into the plastic lens material from the injection port. The reason why it is difficult to specify the target position is thought to be because there are few so-called marks on the mold member or tape.

  The present invention has been made to solve such a problem, and can detect the position of the injection port formed on the tape of the mold assembly quickly and with high accuracy. An object is to provide an apparatus.

  To achieve this object, a position detection device for a plastic lens mold according to the present invention includes a pair of disk-shaped mold members facing each other in a state of being separated from each other, and a tape wound around the outer periphery of these mold members And detecting at least one of the detection unit and the mold assembly relative to the mold assembly formed in a cylindrical shape relative to the other in the axial direction of the mold assembly. A moving device and a position specifying unit that specifies a target position of an injection port formed in the tape based on a detection result of the detection unit, and the mold member and the tape are formed of a material that can transmit light. The detecting section includes a light emitting element and a light receiving element, and an optical path between the light emitting element and the light receiving element is perpendicular to the axial direction of the mold assembly. The position specifying unit is configured to transmit light when the optical path crosses the mold member by driving by the moving device, and light transmittance when the optical path crosses the tape. Are used to detect the edge of the mold member, and the target position is specified based on the position of the edge.

  The present invention is the above invention, wherein the mold assembly is supported by a transport device having a transport path that connects the detection unit and an injection port forming device that forms an injection port in the tape, The mold assembly on the transfer device is moved relative to the detection unit so that the target position coincides with the position of the processing unit of the injection port forming device in the axial direction.

  According to the present invention, in the above invention, a reciprocation in which the detection unit reciprocates between a detection position where the optical path of the detection unit crosses the mold assembly and a retracted position where the optical path is located outside the mold assembly. A moving device is provided.

In the present invention, since the edge of the mold member is optically detected, the target position can be specified with high accuracy based on the position of the edge. In addition, since scanning when optically detecting the edge is performed by driving by a moving device, it can be performed within a certain time without stopping in the middle.
Therefore, according to the present invention, it is possible to provide a position detection device for a plastic lens mold that can quickly and accurately specify a target position of an injection port formed on a tape of a mold assembly.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the structure of the outline of the position detection apparatus for plastic lens molds which concerns on this invention, The figure (A) is a top view, The figure (B) is a side view. It is a perspective view which shows a mold assembly and an injection | pouring auxiliary member. FIG. 4A is a cross-sectional view of a plastic lens mold, in which FIG. 1A is a longitudinal cross-sectional view showing the entire mold cut away, and FIG. 2B is an enlarged cross-sectional view of the main part. It is a side view for demonstrating the change of the transmittance | permeability. It is a side view for demonstrating the principle which specifies a target position. It is a figure which shows the specific structure of the position detection apparatus for plastic lens molds, The figure (A) is a top view, The figure (B) is a side view. It is a figure which shows the structure of a clamp apparatus, the figure (A) is a top view, and the figure (B) is a side view. It is a side view which shows the structure of the outline of an injection port formation apparatus.

Hereinafter, an embodiment of a position detection device for a plastic lens mold according to the present invention will be described in detail with reference to FIGS.
First, a schematic configuration of a position detection device for a plastic lens mold according to the present invention will be described with reference to FIG.
A plastic lens mold position detecting device 1 shown in FIG. 1 is for specifying a position where an injection port to be described later is formed in a mold assembly 2 having a circular shape in a plan view shown in FIG.

As shown in FIGS. 2 and 3, the mold assembly 2 includes a pair of disk-shaped mold members (first mold member 3 and second mold member 4) and mold members 3 and 4. The tape 5 is wound around the outer peripheral surface. The position detection device 1 for a plastic lens mold according to the present invention uses a pre-assembled mold assembly 2.
In the mold assembly 2, after an injection port 6 (see FIG. 2) is formed in the tape 5, an injection assisting member denoted by reference numeral 7 in the drawing is bonded. By adhering the injection assisting member 7 to the mold assembly 2, a plastic lens mold 8 is formed as shown in FIG.

The mold members 3 and 4 are formed in a predetermined shape by a glass material that can transmit light, and constitute a mold for forming a lens surface. In FIG. 3, the lower surface 3a of the first mold member 3 located on the upper side is a concave curved surface that is convex upward, and the upper surface 4a of the other second mold member 4 is convex upward. It is a convex curved surface.
The tape 5 constitutes a mold for molding the edge surface of the lens. This tape 5 is a so-called adhesive tape formed of a material that can transmit light. The tape 5 is wound and pasted around the outer peripheral surfaces of the first and second mold members 3 and 4 at least once.

  The tape 5 covers the entire outer peripheral surface of the first and second mold members 3 and 4. The tape 5 is wound around the first and second mold members 3 and 4 so as not to protrude from the non-use surface of the second mold member 4. The non-use surface is a concave surface opposite to the upper surface 4a of the second mold member 4. The width of the tape 5 can be appropriately changed as long as it is a width that seals the gap between the first and second mold members 3 and 4.

  Although not shown, the tape 5 is constituted by a belt-like base material and an adhesive layer formed on one surface of the base material (a surface facing the mold members 3 and 4). Examples of the base material include polyester. The material forming the adhesive layer is preferably one that does not dissolve into the plastic lens material or inhibit the polymerization, and examples thereof include a silicone-based adhesive. By winding the tape 5 around the pair of mold members 3 and 4, the mold assembly 2 in which the lens forming cavity 9 is formed is assembled.

  In the tape 5, an injection port 6 is formed for injecting a plastic lens material into the cavity 9. The inlet 6 is formed on the tape 5 wound around the first and second mold members 4 by an inlet forming device 11 (see FIG. 8). The position detection device 1 for a plastic lens mold according to the present invention is for specifying an injection port formation position (hereinafter simply referred to as a target position) when the injection port forming device 11 forms the injection port 6. The inlet forming device 11 is configured to cut the tape 5 of the mold assembly 2 by a predetermined length in the circumferential direction of the mold assembly 2 with, for example, a cutter 12.

The target position is determined for each mold assembly 2. The position of the inlet 6 (position with respect to the axial direction of the mold assembly 2) can be set at the center between the first mold member 3 and the second mold member 4. In this case, the target position is that of one mold member by ½ of the distance between the edge of the first mold member 3 on the cavity 9 side and the edge of the second mold member 4 on the cavity 9 side. The position is separated from the edge.
As shown in FIGS. 2 and 3, the injection assisting member 7 is integrally formed with a mounting piece 13 formed in a shape that can be stacked on the outer peripheral portion of the mold assembly 2, and the mounting piece 13. And the auxiliary member main body 14. The injection assisting member 7 is made of a plastic material. The mounting piece 13 is formed in a plate shape curved with a curvature along the outer peripheral surface of the mold assembly 2. In the assembled state shown in FIG. 3, the mounting piece 13 is bonded to the mold assembly 2 with an adhesive 15.

  The auxiliary member body 14 is a cylindrical body having a quadrangular cross section, and is formed so as to extend from the mounting piece 13 to the side opposite to the mold assembly 2. As shown in FIG. 3, the auxiliary member main body 14 according to this embodiment includes a flat plate portion 14a extending in parallel with the radial direction of the mold assembly 2, and an inclined portion 14b facing the flat plate portion 14a. . The inclined portion 14b is inclined so as to gradually approach the flat plate portion 14a toward the mounting piece 13. A flange 16 is provided at the end of the auxiliary member main body 14 opposite to the mounting piece 13.

The inside of the auxiliary member main body 14 becomes a passage 17 through which a molten plastic lens material (not shown) flows. The attachment piece 13 is formed with a slit-like hole 18 (see FIG. 3) that becomes an opening at one end of the passage 17. The hole 18 is formed to extend in parallel with the flat plate portion 14a when the mounting piece 13 is viewed from the mold assembly 2 side.
After the injection port 6 is formed in the tape 5, the injection assisting member 7 is bonded to the mold assembly 2 with the hole 18 facing the injection port 6.

As shown in FIG. 1, the position detection device 1 for a plastic lens mold according to this embodiment includes at least one of a detection unit 21 facing the mold assembly 2, and the mold assembly 2 and the detection unit 21. A moving device 22 connected to either one of them and a position specifying unit 23 connected to the detecting unit 21 are provided.
The detection unit 21 includes a light emitting element 24 and a light receiving element 25. Further, the detection unit 21 has an optical path 26 between the light emitting element 24 and the light receiving element 25 that crosses the mold assembly 2 in a direction perpendicular to the axial direction {vertical direction in FIG. 1A}. Is positioned. The detection unit 21 according to this embodiment is configured to send detection data corresponding to the amount of light incident on the light receiving element 25 to the position specifying unit 23 described later.

The moving device 22 moves at least one of the mold assembly 2 and the detection unit 21 relative to the other in the axial direction of the mold assembly 2. That is, as shown by a solid line in FIG. 1B, the mold assembly 2 is moved with respect to the detection unit 21, and as shown by a two-dot chain line in FIG. There are cases where the mold assembly 2 and the detection unit 21 are moved relative to the other.
When the mold assembly 2 moves relative to the detection unit 21, the position of the optical path 26 with respect to the mold assembly 2 changes in the axial direction as shown in FIGS. FIG. 4A shows a state in which the optical path 26 is located outside the mold assembly 2 in the axial direction. In this case, since there is nothing that blocks the optical path 26, the amount of light incident on the light receiving element 25 is maximized, and the light transmittance is maximized. FIG. 2B shows a state where the optical path 26 crosses the tape 5 located on the outermost side of the mold assembly 2. In this case, since the optical path 26 is blocked by the tape 5, the amount of light decreases, and the transmittance also decreases accordingly.

  FIG. 5C shows a state where the optical path 26 crosses the mold member (the first mold member 3 in the figure). In this case, since the optical path 26 is blocked by the mold member, the light amount is further reduced, and the transmittance is further reduced. FIG. 4D shows a state where the optical path 26 traverses the tape 5 positioned between the pair of mold members. In this case, since the optical path 26 is blocked by the tape 5, the light quantity increases and the transmittance increases. Such a change in the light transmittance occurs in the same manner even when the direction in which the mold assembly 2 moves relative to the detection unit 21 is opposite to the above.

 The position specifying unit 23 obtains the transmittance shown in FIG. 4 using the detection data sent from the detecting unit 21, and specifies the target position based on the transmittance. More specifically, the position specifying unit 23 obtains the transmittance when one of the mold assembly 2 and the detection unit 21 moves in the axial direction with respect to the other by driving by the moving device 22. The light transmittance when the optical path 26 crosses the mold members 2 and 3 is clearly smaller than the light transmittance when the optical path 26 crosses the tape 5. The position specifying unit 23 uses the light transmittance when the optical path 26 traverses the mold members 2 and 3 and the light transmittance when the optical path 26 traverses the tape 5 to determine the position of one mold member. An end edge in the axial direction is detected, and the target position is specified based on the position of the end edge.

  The edge detected by the position specifying unit 23 is an edge located inside the cavity 9 in the mold members 3 and 4 or an edge outside the cavity 9. The distance between the edge and the target position is determined in advance for each mold assembly 2. For this reason, the target position can be specified by detecting the edge. The inlet 6 according to this embodiment is formed by the inlet forming device 11. For this reason, in order to specify the target position, it is necessary to perform it in association with the position of the processing portion (for example, the cutter 12) of the injection port forming device 11.

  In order to realize this, for example, it can be performed as shown in FIG. In FIG. 5, the distance L <b> 1 between the position of the optical path 26 and the position of the processing portion of the injection port forming apparatus 11 is not related to the mold assembly 2 and can be easily obtained. Further, the distance L2 between the edge A of the mold members 3 and 4 (showing the cavity side edge in FIG. 5) and the target position B is determined for each mold assembly 2. In the example illustrated in FIG. 5, the mold assembly 2 moves below the detection unit 21 in the figure by a distance L3 that is a value obtained by subtracting the distance L2 from the distance L1, so that the target position B becomes the injection port forming device 11 It is positioned at a position corresponding to the processed part. That is, the position specifying unit 23 assumes a state in which the mold assembly 2 when the edge A is detected is moved downward in FIG. 5 by the distance L3, and in this state, is separated from the edge by the distance L2. The determined position is specified as the target position B.

  In forming the position detection device 1 for a plastic lens mold according to the present invention, the mold assembly 2 is supported by the moving device 22 so that the axis thereof is directed in the vertical direction, and only the mold assembly 2 is moved. It is desirable to move it up and down by driving with. The optical path 26 is preferably configured to be located at the same position as the processing portion of the injection port forming device 11 in the axial direction (vertical direction) of the mold assembly 2. The reason for configuring in this way is that the operation is simplified and the execution speed can be increased by adopting the above configuration.

Next, a specific configuration of the plastic lens mold position detecting device 1 will be described in detail with reference to FIGS.
In this embodiment, the mold assembly 2 is held by a clamping device denoted by reference numeral 31 in FIG.
The clamp device 31 holds the mold assembly 2 in a state where the lens surface is oriented in the vertical direction. The mold assembly 2 is held by the clamp device 31 by sandwiching the outer peripheral portion of the mold assembly 2 from the outside in the radial direction by a plurality of holding members 32.

  As shown in FIG. 7, the clamp device 31 includes four holding members 32 and an actuator 33 that drives these holding members 32. The holding member 32 according to this embodiment is formed in a columnar shape. The shape and quantity of the holding member 32 can be changed as appropriate. The actuator 33 has a configuration in which two sliders 33a and 33b arranged in the horizontal direction are moved closer to or away from each other. Two holding members 32 are attached to the sliders 33a and 33b.

As shown in FIG. 7A, the clamp device 31 holds the mold assembly 2 so that the axis C of the mold assembly 2 coincides with a predetermined reference position A when viewed from above.
The clamp device 31 is supported by a transport device 34 (see FIG. 6) so that the mold assembly 2 can be sent to a device adjacent to the detection unit 21 and the injection port forming device 11.
The transport device 34 supports the clamp device 31 so that it can move in three directions. The three directions are a conveyance direction along the conveyance path 34a {see FIG. 6A) passing through the vicinity of the detection unit 21 and the injection port forming device 11, and the conveyance path 34a, the detection unit 21, and the injection port formation device 11. A front-rear direction that is a direction of reciprocating between and a vertical direction.

Such a conveying device 34 can be configured using a turntable 35 as shown in FIG. 6B, for example.
The turntable 35 includes a table 37 that rotates on the base 36 with the vertical direction as the axial direction. The base 36 is also provided with the detection unit 21 and the injection port forming device 11. The table 37 rotates intermittently by a predetermined angle so that the mold assembly 2 held by the clamp device 31 is conveyed to the detection unit 21 and the injection port forming device 11. Although not shown, the turntable 35 is configured such that an air passage that supplies air pressure to each device that rotates together with the table 37 can rotate with respect to the base 36 at the central portion of the table 37. ing.

  The table 37 is rotatably supported on the base 36. Although not shown, the table 37 is provided with a plurality of clamping devices 31. These clamping devices 31 are supported by the table 37 via a slide mechanism 41 (see FIG. 6B), which will be described later, in a state of being arranged at equal intervals in the rotation direction of the table 37. In this case, the transport direction is the rotation direction of the table 37. Thus, when the conveyance apparatus 34 is comprised by the turntable 35, the detection part 21 and the injection port formation apparatus 11 are arrange | positioned on the radial direction outer side of the turntable 35. FIG.

  As shown in FIG. 6B, the slide mechanism 41 is supported by the turntable 35 so as to be movable in the vertical direction, and supported by the vertical slider 42 so as to be movable in the front-rear direction. The front-rear direction slider 43 is provided. The front-rear direction slider 43 is formed so as to extend from the table 37 to the outer side in the radial direction of the turntable 35. The clamp device 31 is mounted on the front / rear direction slider 43.

  An actuator 44 for moving the vertical slider 42 in the vertical direction is connected to the vertical slider 42. Although not shown in detail, the actuator 44 is configured to drive the vertical slider 42 using a motor or an air cylinder as a power source. The actuator 44 can be supported on the table 37 or the base 36. The vertical slider 42 and the longitudinal slider 43 are provided with brakes 45 and 46 for restricting movement, respectively. These brakes 45 and 46 are released from the braking state only when the vertical slider 42 and the front-rear slider 43 are slid. The operations of the brakes 45 and 46 and the operations of the above-described clamping device, transport device 34, actuator 44, and the like are controlled by a control device (not shown). In this embodiment, the vertical slider 42 and the actuator 44 are used to make “at least one of the detection portion and the mold assembly relative to the other in the axial direction of the mold assembly” according to the present invention. A moving device to be moved ”is configured.

  A pressure receiving piece 43a extending downward is provided at one end of the front / rear direction slider 43 (an end located outside in the radial direction of the turntable). The pressure receiving piece 43a is pushed in the front-rear direction by a front-rear direction positioning device (not shown). The front / rear direction positioning device moves the front / rear direction slider 43 together with the pressure receiving piece 43a in the front / rear direction to position the mold assembly 2 at a predetermined position in the front / rear direction. The predetermined position is a predetermined interval when the mold assembly 2 is sent to a position facing the injection port forming device 11 by the conveying device 34. It is such a position. The front-rear direction positioning device is disposed upstream of the detection unit 21 in the transport direction by the transport device 34. That is, the mold assembly 2 is transported to a position facing the detection unit 21 by the transport device 34 while being positioned at the predetermined position in the front-rear direction by the front-rear direction positioning device.

  As shown in FIGS. 6 and 7, the detection unit 21 according to this embodiment is configured such that an optical path 26 between the light emitting element 24 and the light receiving element 25 crosses the mold assembly 2 in the horizontal direction. The vertical position of the optical path 26 coincides with the vertical position of the processing portion (cutter 12) of the injection port forming device 11. The light emitting element 24 and the light receiving element 25 are supported by the base 36 via a reciprocating device 51 described later.

  The reciprocating device 51 moves the light emitting element 24 and the light receiving element 25 between a detection position indicated by a solid line in FIG. 6 and a retracted position indicated by a two-dot chain line in FIG. When the light emitting element 24 and the light receiving element 25 are moved to the detection position, as shown in FIG. 6A, the optical path 26 crosses the mold assembly 2 as viewed from above. By moving the light emitting element 24 and the light receiving element 25 to the retracted position, the conveyance path 34a is opened, and the light emitting element 24 and the light receiving element 25 do not hinder the conveyance of the mold assembly 2. The mold assembly 2 stops at a position lower than the light emitting element 24 and the light receiving element 25 when being conveyed to a position adjacent to the detection unit 21. The operation of the reciprocating device 51 is controlled by the control device.

  In specifying the target position in this embodiment, first, the light emitting element 24 and the light receiving element 25 are moved to the detection position, and in this state, the vertical slider 42 is raised by driving by the actuator 44. That is, the mold assembly 2 is raised so as to cross the optical path 26 from below. By moving the mold assembly 2 upward from below so that the optical path 26 is blocked, the light of the light emitting element 24 is irradiated to the first mold member 3 located above, and then both the mold members 3, 4. It irradiates the tape 5 located between. The transmittance when light passes through the first mold member 3 and the transmittance when light passes through the tape 5 are greatly different as shown in FIG.

  In this embodiment, the vertical position of the optical path 26 coincides with the vertical position of the processed portion of the inlet forming device 11. For this reason, the position specifying unit 23 according to this embodiment is configured so that the mold assembly 2 has a distance L2 shown in FIG. 5 from the position where the edge A (see FIG. 5) on the cavity 9 side of the first mold member 3 is detected. When the position rises, the vertical slider 42 is stopped and the target position B is specified. As a result, the mold assembly 2 is positioned in the vertical direction so that the target position B is at the same height as the processed portion of the injection port forming device 11. The detector 21 is moved to the retracted position by the reciprocating device 51 after the positioning is completed.

  After the target position is specified in this way, the mold assembly 2 is transported to a position facing the injection port forming device 11 by the transport device 34. During the conveyance, the brakes 45 and 46 are operated, so that the mold assembly 2 is kept at a constant position with respect to the table 37 in the vertical direction and the front-rear direction. Thereafter, the injection port forming device 11 forms the injection port 6 at the target position B.

In the plastic lens mold position detecting device 1 configured as described above, since the edges of the mold members 3 and 4 are optically detected, the target position is determined with high accuracy based on the positions of the edges. Can be specified. In addition, since the scanning for optically detecting the edge is performed by driving by the moving device 22 (actuator 44), it can be performed within a certain time without stopping in the middle.
Therefore, according to this embodiment, there is provided a position detection device for a plastic lens mold that can quickly and accurately specify the target position of the inlet 6 formed in the tape 5 of the mold assembly 2. be able to.

  The mold assembly 2 according to this embodiment is supported by a transport device 34 having a transport path 34 a that connects the detection unit 21 and the injection port forming device 11 that forms the injection port 6 in the tape 5. Further, the moving device 22 moves the mold assembly 2 on the transport device 34 with respect to the detection unit 21 so that the target position coincides with the position of the processing portion of the injection port forming device 11 in the axial direction. It is to be moved.

  For this reason, according to this embodiment, there is provided a position detection device for a plastic lens mold capable of automating the process from when the target position is specified until the injection port 6 is formed by the injection port forming device 11. Can be provided. If the process from the identification of the target position, which is the position for forming the injection port 6, to the formation of the injection port 6 is automated, the injection port 6 can be formed quickly and with high accuracy.

The detection unit 21 according to this embodiment is configured between a detection position where the optical path 26 of the detection unit 21 crosses the mold assembly 2 and a retracted position where the optical path 26 is located outside the mold assembly 2. A reciprocating device 51 that reciprocates the detecting unit 21 is provided.
According to this embodiment, the position of the detection unit 21 with respect to the mold assembly 2 is determined by the reciprocating device 51. For this reason, when sequentially specifying the target position for the plurality of mold assemblies 2, the position of the optical path 26 with respect to each mold assembly 2 is constant. Therefore, since the end edges of all the mold assemblies 2 can be optically detected under the same conditions, a position detection device for a plastic lens mold that can specify a target position with a certain quality is provided. be able to.

  DESCRIPTION OF SYMBOLS 1 ... Plastic lens molding position detection apparatus, 2 ... Mold assembly, 3 ... 1st mold member, 4 ... 2nd mold member, 5 ... Tape, 6 ... Injection port, 7 ... Injection auxiliary member, 11 ... Note Inlet forming device, 21 ... detection unit, 24 ... light emitting element, 25 ... light receiving element, 31 ... clamp device, 34 ... conveying device, 42 ... vertical slider, 44 ... actuator, 51 ... reciprocating device.

Claims (3)

A detection unit facing a mold assembly formed in a columnar shape by a pair of disk-shaped mold members facing each other in a state of being separated from each other, and a tape wound around the outer peripheral part of these mold members;
A moving device that moves at least one of the detection unit and the mold assembly relative to the other in the axial direction of the mold assembly;
A position specifying unit that specifies a target position of an inlet formed in the tape based on a detection result of the detection unit;
The mold member and the tape are formed of a material capable of transmitting light,
The detection unit includes a light emitting element and a light receiving element, and an optical path between the light emitting element and the light receiving element is positioned so as to cross the mold assembly in a direction perpendicular to the axial direction.
The position specifying unit uses the light transmittance when the optical path crosses the mold member as driven by the moving device, and the light transmittance when the optical path crosses the tape. And detecting the target position based on the position of the edge, and a position detection device for a plastic lens mold. The position detection device for a plastic lens mold according to claim 1,
The mold assembly is supported by a transport device having a transport path connecting the detection unit and an injection port forming device that forms an injection port in the tape,
The moving device moves the mold assembly on the transfer device relative to the detection unit so that the target position coincides with the position of the processing unit of the injection port forming device in the axial direction. A position detection device for a plastic lens mold.   3. The position detection device for a plastic lens mold according to claim 1, wherein a detection position where the optical path of the detection unit crosses the mold assembly, and a retracted position where the optical path is located outside the mold assembly. And a reciprocating device for reciprocating the detecting unit between the position detecting device for a plastic lens mold.

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