JP3677989B2 - Lens manufacturing equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lens molding mold piece and a lens manufacturing apparatus, and in particular, when a plastic lens is molded by a lens molding mold body in which a pair of lens molding mold pieces are fixed in a state of being opposed to each other. The present invention relates to a suitable mold piece structure and a mold forming mechanism.
[0002]
[Prior art]
Conventionally, plastic lenses may be manufactured by injection molding or compression molding using thermoplastic resin. To produce plastic lenses with excellent optical properties and other physical properties, high shape accuracy and specificity are required. In general, cast molding is used.
[0003]
As a method of manufacturing a plastic lens by casting, there is a method in which two disk-shaped lens molding mold pieces are positioned and fixed to each other with a gasket or the like, and at the same time, a cavity is formed. The lens molding mold piece includes a molding surface for molding the optical surface of the lens and a side surface portion adjacent to the molding surface. In this method, a pair of lens molding mold pieces are positioned relative to each other with a flexible gasket, or a pair of lens molding mold pieces are accurately positioned with a positioning jig or the like, and then a lens molding mold piece. An integral lens-molding mold body is formed by a method such as winding a tape-shaped sealing film around the side surface of the lens. In particular, a method for forming the latter lens molding mold is disclosed in Japanese Patent Application Laid-Open No. 56-135029. By this method, a high-precision plastic lens can be obtained at low cost.
[0004]
When the lens molding mold piece is fixed by the gasket, a reference mark is formed on the periphery of the gasket in order to align the rotational direction between the pair of lens molding mold pieces. In the lens molding mold piece, a positioning mark is formed on the peripheral surface of the upper surface opposite to the molding surface, and the positioning mark is aligned with the reference mark of the gasket. Were positioned in the direction of rotation with respect to the gasket.
[0005]
On the other hand, in the method described in the above publication, the lens forming mold pieces are attached to a positioning jig so as to be rotatable and the mutual distance can be changed, and the mutual distance between the lens forming mold pieces is set by the jig. In addition, a positioning mark is formed on the upper surface of the lens forming mold piece, and the rotation angle position between the pair of lens forming mold pieces is manually adjusted by aligning the positioning mark with a predetermined position of the jig. May be matched visually.
[0006]
[Problems to be solved by the invention]
However, in the case where the lens molding mold piece is positioned in the rotation direction with the naked eye as described above, accuracy is limited and productivity is insufficient, and manufacturing cost is difficult to reduce. Further, in this case, the method using the above gasket increases the cost because the gasket is disposable, and the method described in the above publication requires a relatively large amount of work for attaching and removing the lens molding mold piece to the jig. In any case, there is a problem that inadequate points may occur in manufacturing cost, productivity, and optical accuracy of the molded lens.
[0007]
Therefore, the present invention solves the above-mentioned problems, and the problem is that a pair of lens molding mold pieces can be easily positioned with respect to each other, and a relatively low-cost and high-precision lens molding mold is provided. An object of the present invention is to provide a structure of a mold piece and an apparatus configuration capable of configuring a body with high productivity.
[0008]
[Means for Solving the Problems]
Means taken by the present invention to solve the above problems is a lens molding mold piece having a molding surface for molding the optical surface of a lens and a side surface adjacent to the molding surface, A lens molding mold body having a lens molding cavity in which the molding surfaces are opposed to each other with the lens molding mold piece, and a positioning mark is formed on the surface of the side surface portion. It is characterized by.
[0009]
According to this means, in the lens molding mold piece for constituting the lens molding mold body, the positioning mark is formed on the side surface over the predetermined display range, so the lens molding mold piece is rotated. Alternatively, the positioning mark can be recognized from the side by turning the measuring device, so that this positioning mark is aligned with a predetermined orientation, or by aligning the positioning marks of the pair of lens molding mold pieces, Positioning in the rotational direction of the lens molding mold piece can be automated, and high-precision positioning becomes possible, so that productivity and lens molding accuracy can be improved.
[0010]
Here, it is preferable that the positioning mark is formed over a predetermined display range on the surface of the side surface portion. According to this means, since it is formed over a predetermined display range, scratches and deposits are present on the side surface portion of the lens molding mold piece by using the display range as a recognition condition for the positioning mark. Also, false detection can be reduced.
[0011]
Moreover, it is preferable that the positioning mark includes a pair of display portions formed on both side ends of the display range. According to this means, by including a pair of display portions as positioning marks, it is possible to reduce false detection by using the interval between the pair of display portions as a recognition condition.
[0012]
Further, in each of the above means, it is preferable that the positioning mark includes a vertical groove formed in the surface of the side surface portion and extending in the thickness direction as a display portion. According to this means, since the vertical groove extending in the thickness direction is included as the display portion, it becomes possible to set the position by the vertical groove, so that the positioning accuracy in the side surface portion of the lens molding mold piece can be improved. In addition, the longitudinal groove can be easily formed as a marking line or the like, and is not lost in a cleaning process or the like.
[0013]
In this case, it is desirable that the longitudinal groove is partially formed when viewed in the thickness direction of the side surface portion. Since the longitudinal grooves are partially formed when viewed in the thickness direction of the side surface portion, the lens molding mold pieces are made to face each other and the space between the side surface portions is sealed with a sealing member. When the body is configured, it is possible to prevent the sealing performance of the internal lens molding cavity from being lost by forming the longitudinal groove.
[0014]
Next, the molding surfaces of a pair of lens molding mold pieces each having a molding surface for molding the optical surface of the lens and a side surface portion adjacent to the molding surface are arranged to face each other with a predetermined distance therebetween. A lens manufacturing apparatus for constituting a lens molding mold body provided with a lens molding cavity, comprising: a pair of gripping mechanisms that rotatably grip a pair of lens molding mold pieces; and the lens molding A recognizing means for visually recognizing the side surface portion of the mold piece; and a lens forming mold piece for recognizing the positioning mark formed on the side surface portion of the lens forming mold piece. At least one of the lens molding moldings is rotated based on the information recognized by the recognition unit based on the positioning mark. Characterized in that it comprises a rotation control means for at least one piece by relatively rotating with respect to the other aligning the positional relationship in the rotational direction between the mutual pair of the lens forming mold pieces.
[0015]
According to this means, each of the pair of lens molding mold pieces is gripped by the pair of gripping mechanisms, the positioning mark formed on the side surface portion is recognized by the recognition means, and the rotation control means rotates the lens molding mold piece. Positioning in the direction can be performed automatically. Therefore, each operation of gripping and positioning the lens molding mold piece can be automated, and the lens molding mold body can be configured quickly and accurately. Further, since the recognition means is configured to recognize the positioning mark provided on the side surface portion of the lens molding mold piece, it easily recognizes the positioning mark with respect to the pair of lens molding mold pieces arranged to face each other. For example, the recognition means for the pair of lens molding mold pieces can be used without providing a complicated moving mechanism, and the recognition means can be configured simply.
[0016]
In this case, prior to the recognizing means, a rough position detecting means for detecting a rough position of the positioning mark is provided, and the information detected by the rough position detecting means based on the positioning mark is used by the recognizing means. It is preferable that a recognition region in the rotation direction in the side surface portion of the lens molding mold piece is selected or configured so as to limit a recognition range. According to this means, the recognition area by the recognition means can be selected or the recognition range can be limited based on the information detected by the approximate position detection means. And the processing content can be simplified.
[0017]
In each of the above means, a mold interval control means for setting a mutual interval between the pair of lens molding mold pieces and driving a pair of the gripping mechanisms to match the mutual interval between the lens molding mold pieces to a set value. It is preferable to provide. According to this means, since it is possible to set the mutual interval while holding the lens molding mold piece by the holding mechanism, a sealing member such as a sealing film or tape is directly attached between the side surfaces of the pair of lens molding mold pieces. Since the lens molding mold body can be configured, it is possible to maintain the positioning accuracy of the mold body and improve the productivity.
[0018]
In this case, the side surface portions of the pair of lens molding mold pieces that are mutually positioned by the rotation control means and the interval control means are connected to each other and the side surface portions of the pair of lens molding mold pieces are connected. It is desirable to provide a winding fixing means for winding and fixing the sealing member that seals the gap.
[0019]
In this case, the winding fixing means includes a sealing member supply means for supplying the sealing member to the side portions of the pair of lens molding mold pieces, and a pair of the lens molding mold pieces. Winding control means for controlling the sealing member supply means and the gripping mechanism so that the sealing member winds in the circumferential direction of the side surface while rotating integrally, and winding of the sealing member is completed After that, it is desirable to have sealing member cutting processing means for cutting the sealing member and performing end processing of the sealing member.
[0020]
In each of the above means, the sealing member is a flexible film or a tape-like member having an adhesive surface on one side, because the processing can be facilitated and the resin sink during molding can be absorbed by flexibility. preferable. In this case, in particular, as an end treatment of the sealing member, it is desirable to form an ear picking portion in which the end portions are bent and the adhesive surfaces are bonded to each other because the post-processing is facilitated.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of a lens molding mold piece and a lens manufacturing apparatus according to the present invention will be described with reference to the accompanying drawings. FIG. 14 shows a schematic concrete configuration example of the main part of the lens manufacturing apparatus according to this embodiment. A pair of guide rails 3a extending in the Y-axis direction, which is the left-right direction in the figure, are fixed on the support frame 3, and the transport 4 is configured to be movable along the guide rails 3a by a drive motor 3b. As shown in FIG. 13, the transport 4 is equipped with an upper shaft unit 10 and a lower shaft unit 20, both of which are the X-axis direction and the vertical direction perpendicular to the Y-axis direction. There are provided an upper shaft body 11 and a lower shaft body 21 that are configured to be movable in directions and to be rotatable (rotated) around vertical rotation axes. An upper shaft gripping portion 12 is attached to the lower end portion of the upper shaft body 11, and a lower shaft gripping portion 22 is attached to the upper end portion of the lower shaft body 21.
[0022]
In FIG. 1, the upper and lower lens gripping portions 12 and 22 are attached to and gripped by upper and lower lens molding mold pieces (hereinafter simply referred to as “upper die and lower die”) 1 and 2 according to the present embodiment. It is the schematic which shows the state. As shown in FIG. 1, both the upper shaft gripping portion 12 and the lower shaft gripping portion 22 are provided with circular suction rings 12a and 22a. By connecting the exhaust passage formed inside to a vacuum device (not shown), The mold 1 and the lower mold 2 are configured to be sucked and gripped. The upper mold 1 and the lower mold 2 are generally made of glass, plastics or the like, but may be made of any material as long as it has characteristics (heat resistance, predetermined rigidity or strength) that enable cast molding. There may be. The lower surface of the upper mold 1 and the upper surface of the lower mold 2 are molding surfaces for molding the optical surface of the lens, and both mold pieces have side portions adjacent to the molding surface. In this embodiment, the surface of the side surface portion is a cylindrical surface. However, any surface other than the cylindrical surface can be used. The upper shaft gripping part 12 sucks and holds the upper surface of the upper mold 1, and the lower shaft gripping part 22 sucks and holds the lower surface of the lower mold 2.
[0023]
As shown in FIG. 14, an upper mold positioning unit 5 and a lower mold positioning unit 6 are fixed to the support frame 3 at the illustrated left end portion of the transport range of the transport 4 in the Y-axis direction. The upper mold positioning unit 5 includes a pair of clamp members that planarly position the upper mold 1 supplied by a transport unit (not shown) on a horizontal plane. The upper mold 1 positioned by these clamp members is gripped by the upper shaft. The portion 12 is attracted and held with high accuracy. The upper mold positioning unit 5 has a measuring gauge pin configured to contact the molding surface of the upper mold 1 gripped by the upper shaft gripping portion 12 so as to push up from below and measure the center height of the molding surface. It is provided so that it can be raised and lowered so as to protrude upward. On the other hand, the lower mold positioning unit 6 also includes a pair of clamp members that planarly position the lower mold 2 supplied by a transport unit (not shown) on a horizontal plane, and the lower mold 2 positioned by these clamp members. Is sucked and gripped by the lower shaft gripping portion 22. A lower mold measuring mechanism 7 is disposed above the lower mold positioning unit 6 as shown in FIG. 13, and the lower mold measuring mechanism 7 is movable up and down so that the same measurement gauge pin 7a as described above protrudes downward. Is provided. The measurement gauge pin 7a measures the center height of the molding surface by coming into contact with the molding surface of the lower mold 2 gripped by the lower shaft gripping portion 22 from above.
[0024]
As shown in FIG. 14, the transport 4 is wound around the side surfaces of the upper mold 1 and the lower mold 2 around the mold body forming position where the mold body 30 is formed, as will be described later. A tape cassette 8 storing a resin tape, which will be described later, a tape pressing unit 15 constituting a path for sending the resin tape from the tape cassette 8 toward the upper mold and the lower mold, and pressing the resin tape against the side surfaces of the upper mold and the lower mold. A tape winding roller unit 16 for winding and a tape cutting processing unit 17 for cutting, bending and bonding the end of the wound tape are arranged. The upper mold 1 and the lower mold 2 constituting the mold body 30 shown in FIG. 14 are positioned by the upper mold positioning unit 5 and the lower mold positioning unit 6 and then gripped by the upper shaft gripping portion 12 and the lower shaft gripping portion 22. Then, the center heights of the molding surfaces of the upper mold 1 and the lower mold 2 are measured. Then, the transport 4 moves, and the upper shaft gripping part 12 that grips the upper mold 1 and the lower shaft gripping part 22 that grips the lower mold 2 are arranged at the mold body forming position where the mold body 30 is shown in FIG. Is done.
[0025]
As shown in FIG. 1, positioning marks are formed on side surfaces of the upper die 1 and the lower die 2 over a display range of a predetermined length in the circumferential direction at a specific position in the circumferential direction. Any positioning mark can be used as long as it is identifiable from the outside, and may be a line or a figure drawn on the side surface. In this embodiment, the positioning mark is used as the rotation direction of the display range. A pair of longitudinal grooves 1a, 1b, 2a, 2b are formed which are disposed at both ends of each other and spaced from each other. These longitudinal grooves 1a, 1b, 2a, 2b have an advantage that they do not disappear even when the upper mold and the lower mold are cleaned. This vertical groove is formed as a scribe line by scratching a sharp object on the surface of the side part of the upper mold 1 and the lower mold 2, but when forming the upper mold and the lower mold, A similar vertical groove may be formed by processing the side surface portion simultaneously or later. The longitudinal groove may be a concave portion having an arbitrary shape.
[0026]
FIG. 2 is an explanatory diagram showing a detection method for detecting the rotational positions of the upper mold 1 and the lower mold 2 at the mold body forming position. The tip of the vibration sensing arm 31a of the vibration sensor 31 is in contact with the side surfaces of the upper mold 1 and the lower mold 2 arranged at predetermined intervals in the vertical direction, and the upper shaft body 11 and the lower shaft body 21 are connected to each other. When the upper mold 1 and the lower mold 2 are rotated to rotate, the vibration-sensing arm 31a is caught in the vertical grooves 1a, 1b, 2a, and 2b, and the approximate position of the vertical grooves can be detected.
[0027]
Around the upper mold 1 and the lower mold 2, a light source 32 for irradiating light on the side surfaces of the upper mold 1 and the lower mold 2, which are separated from the detection unit of the vibration sensing arm 31 a to some extent, and the illumination light Thus, a camera 33 for photographing the side surfaces of the upper mold 1 and the lower mold 2 is arranged. The light source 32 illuminates the photographing position from an oblique direction, and is designed so that the vertical groove can photograph with good contrast. When the upper mold 1 and the lower mold 2 are rotated clockwise from the position shown in FIG. 2, first, the longitudinal grooves 1a, 2a and 1b, 2b are sequentially detected by the vibration sensing arm 31a of the vibration sensor 31 as described above. Then, as shown in FIG. 3, when the upper mold 1 and the lower mold 2 are rotated, the vertical groove forming portion is photographed by the camera 33 after a predetermined time according to the rotation speed.
[0028]
FIG. 4 shows an image of the side surface of the upper mold 1 or the lower mold 2 taken by the camera 33. Since a predetermined distance L exists in advance between the vertical groove 1a or 2a and the vertical groove 1b or 2b, the rotational position of the upper mold 1 or the lower mold 2 is determined based on this distance L. For example, even if the scratches s and t are formed on the side surface of the upper mold 1 or the lower mold 2, the distance between the scratches s and t, the distance S between the scratch s and the longitudinal groove 1b (2b), and the scratch t and the vertical If the interval T of the grooves 1a (2a) is not the predetermined interval L, the scratches s and t are not recognized as vertical grooves, and the rotational position of the upper mold 1 or the lower mold 2 is determined based on the normal vertical grooves. Can be reliably identified. The area within the interval L constitutes a display range of positioning marks.
[0029]
FIG. 6 is a configuration block diagram showing a configuration for detecting and positioning the rotational position of the upper mold 1 or the lower mold 2 described above. The detection signal of the vibration sensor 31 is converted into a timing signal that informs the time timing when the longitudinal groove is detected via the signal shaping circuit 34. This timing signal is input to the microprocessor unit 36 that controls the entire apparatus. On the other hand, the image signal photographed by the camera 33 is input to the image processing circuit 35, and the position of a portion that seems to be a vertical groove in the circumferential direction in the image shown in FIG. 4 is specified by the image processing. 36. In the microprocessor unit 36, first, an approximate time point at which the longitudinal groove comes to the photographing position of the camera 33 is calculated based on the time timing of the timing signal and the rotational speed of the upper die 1 or the lower die 2, and at this approximate time point, Position information that is considered to be a vertical groove acquired from an image that is considered to include a vertical groove is acquired, and the position of the vertical groove that matches the interval L is specified as shown in FIG. This process may be repeated a plurality of times while the upper mold 1 or the lower mold 2 is rotated a plurality of times in order to improve detection accuracy or certainty.
[0030]
Next, when the rotational position of the longitudinal groove is specified as described above, the microprocessor unit 36 issues a command to the upper shaft positioning unit 10 or the lower shaft positioning unit 20, and the position of the longitudinal groove is directed to a predetermined direction. Thus, the upper mold 1 or the lower mold 2 is stopped. The pair of longitudinal grooves are both the same length and the same width, but as shown in FIG. 5, both or both of the width and length of the longitudinal grooves may be formed. By changing the width and / or length in this way, it is possible to use the shape requirement of the longitudinal groove when detecting the longitudinal groove, so that scratches, dirt, etc. are more than in the case of forming a pair of identically shaped longitudinal grooves. It is possible to improve the detection accuracy of the longitudinal groove with respect to. For example, in the combination of the vertical grooves 1c and 1d shown in FIG. 5, there is a wide and short vertical groove 1c on the left side in the image, and a narrow and long vertical groove on the right side that is separated from the vertical groove 1c by a distance L. The image processing circuit 35 is configured to recognize that it is a predetermined positioning mark only when the groove 1d exists. The function of the image processing circuit 35 may be realized by executing a predetermined program.
[0031]
In the said embodiment, although the vertical groove (longitudinal recessed part) is formed in the side part of the upper mold | type 1 or the lower mold | type 2, these vertical grooves are not formed over the whole up-down direction of a side part, It is partially formed in the vertical direction. This prevents the sealing of the lens molding cavity in the lens molding mold from being lost when a resin tape to be described later is attached to the side surface, and the lens molding cavity is securely sealed with the resin tape. can do. In the above embodiment, the non-formed portion of the vertical groove is provided on both the upper and lower sides in the thickness direction of the side surface portion, but the non-formed portion is provided only on either the upper or lower side, or the non-formed portion is provided in the central portion in the thickness direction. May be provided.
[0032]
In the present embodiment, for the upper mold 1 and the lower mold 2 carried to the mold body forming position, first, the positioning marks made of the vertical grooves 1a and 1b of the upper mold 1 are matched with a predetermined direction by the above-described method, Next, the positioning marks formed by the vertical grooves 2a and 2b of the lower mold 2 are matched with a predetermined direction. Then, based on the center height of the molding surface of the upper mold 1 and the center height of the molding surface of the lower mold 2 measured as described above, the upper thickness is adjusted so as to correspond to a predetermined lens thickness. By raising and lowering the shaft gripping portion 12 and the lower shaft gripping portion 22, the vertical distance between the upper mold 1 and the lower mold 2 is set to a distance predetermined by the lens design.
[0033]
Once the upper mold 1 and the lower mold 2 are positioned in the rotational direction and the height direction as described above, the upper mold is then formed at the mold body forming position as shown in FIGS. Between the side surface portion of 1 and the side surface portion of the lower mold 1, a belt-shaped resin tape 14 made of a sealing film is attached. The sealing film preferably can withstand the heat received when the resin is injected into the mold body or cured, and has some flexibility to cope with resin sink marks. In this embodiment, the resin tape 14 is drawn out and wound around a roll wound on the tape cassette 8 shown in FIGS. 14 and 15. The resin tape 14 may be fixed to the side surfaces of the upper mold 1 and the lower mold 2 by application of adhesive or heat shrinkage, but in this embodiment, the resin tape 14 is used as one of the methods with high workability and certainty. The pressure-sensitive adhesive tape has a pressure-sensitive adhesive surface, and the pressure-sensitive adhesive surface of the resin tape 14 is attached to the side surfaces of the upper mold 1 and the lower mold 2.
[0034]
The resin tape 14 is formed on the side surfaces of the upper mold 1 and the lower mold 2 by a tape winding device including the tape cassette 8, the tape pressing unit 15, the tape winding roller unit 16, and the tape cutting processing unit 17 shown in FIGS. Wrapped around. First, the resin tape 14 is pulled out from a roll (not shown) set in the tape cassette 8, and a resin is formed between the guide surface of the guide plate 15 a provided in the tape pressing unit 15 and the tape pressing member 15 b configured so as to be freely retractable. The tip of the tape 14 advances toward the upper mold 1 and the lower mold 2. A large number of pores (not shown) are formed on the guide surface of the guide plate 15a, and the non-adhesive surface of the resin tape 14 can be sucked and held by suction from these pores. When the front end of the resin tape 14 approaches the side surfaces of the upper mold 1 and the lower mold 2, as shown in FIG. 10, the tape winding roller unit 16 is unwound and a winding roller 16 a rotatably attached to the front end is provided with the resin tape 14. Are pressed against the side surfaces of the upper mold 1 and the lower mold 2. Since both the upper mold 1 and the lower mold 2 start to rotate at the same speed, the resin tape 14 is wound around the side surfaces of the upper mold 1 and the lower mold 2 as shown in FIG.
[0035]
When the resin tape 14 is wound around the side surfaces of the upper mold 1 and the lower mold 2 and wound around the entire circumference of both side surfaces, the tape cutting processing unit 17 shown in FIGS. The support-side suction plate 17a and the rotation-side suction plate 17b that extend in the direction and are spaced apart from each other as shown in FIG. Each of the support-side suction plate 17a and the rotation-side suction plate 17b has a pore on the suction surface, and reliably holds the resin tape 14 by known vacuum suction. Next, the cutter 17c of the tape cutting unit 17 is fed out to cut the resin tape 14. At this time, the non-adhesive surface of the resin tape 14 on the mold side from the cutting position is sucked and held by the support side suction plate 17a and the rotation side suction plate 17b, and on the tape cassette 8 side from the cutting position. The non-adhesive surface is adsorbed and held on the guide surface of the guide plate 15a. When the cutting of the resin tape 14 is completed, as shown in FIG. 12, the support shaft 17d moves from above and below to the adhesive surface side of the resin tape 14 between the support side suction plate 17a and the rotation side suction plate 17b, The moving side suction plate 17b rotates about the support shaft 17d and moves to the opposite side of the support side suction plate 17a. In this state, the support shaft 17d is retracted up and down, the support side suction plate 17a and the rotation side suction plate 17b approach each other, and the adhesive surfaces of the resin tape 14 are bonded to each other, and the ear fold portion 14a shown in FIG. Form. Finally, the upper mold 1 and the lower mold 2 are further rotated, and the unbonded portion of the resin tape 14 is attached to the ear fold portion 14a.
[0036]
In this way, as shown in FIG. 9, the upper mold 1 and the lower mold 2 are fixed to each other by the resin tape 14 adhered to the side surface portion, and between the upper mold 1 and the lower mold 2. A lens molding mold body 30 in which the formed cavity is sealed is formed. The winding end of the resin tape 14 is the ear fold 14a as described above.
[0037]
According to the present embodiment described above, the positioning marks are formed on the side surfaces of the upper mold 1 and the lower mold 2 which are lens molding mold pieces, and the upper and lower molds 1 and 2 are recognized by recognizing them as images. Since the rotation direction is automatically adjusted, the lens molding mold piece can be positioned with high accuracy and the shape accuracy of the lens molding cavity can be increased. Further, since the positioning mark is formed over a predetermined display range in the circumferential direction on the side surfaces of the upper and lower molds, which are mold pieces, the dimension of the display range in the circumferential direction of the positioning mark is used as a recognition condition. Accordingly, the recognition accuracy of the positioning mark can be enhanced, and erroneous detection can be prevented even if a flaw is formed on the side surface portion of the lens molding mold piece or dirt is attached. In particular, in this embodiment, since the positioning mark is constituted by a pair of vertical grooves 1a, 1b, 2a, 2b formed at a predetermined interval in the circumferential direction, mark formation becomes easy and the distance between the pair of vertical grooves Can prevent false detection. Furthermore, in this embodiment, since the vertical grooves are partially formed as viewed in the vertical direction so as not to penetrate the side surfaces of the upper mold 1 and the lower mold 2 in the vertical direction, a sealing film such as a resin tape 14 is formed. When sticking to a side part, the sealing property of a sealing film sticking part is not lost with a vertical groove.
[0038]
In the above embodiment, the upper mold 1 and the lower mold 2 which are lens molding mold pieces are individually positioned in the rotational direction sequentially, but the upper mold 1 and the lower mold 2 are relatively positioned. Is also possible. For example, the upper shaft body 11 is positioned in the rotational direction so that one of the mold pieces, for example, the longitudinal grooves 1a and 1b, which are positioning marks of the upper mold 1, is located in the photographing region of the camera 33 as the recognition means. Positioning can also be performed so that the vertical grooves 2a and 2b, which are positioning marks of the lower mold 2, coincide with the mold 1. In this case, as shown in FIG. 7, the camera 33 is configured so that the side surface portion of the upper mold 1 and the side surface portion of the lower mold 2 can be simultaneously captured in the same image, and the positioning mark (vertical groove) of the upper mold 1 is obtained. 1c, 1d) and the positioning mark (vertical grooves 2c, 2d) of the lower mold 2 can be positioned by rotating the other of the mold pieces, that is, the lower mold 2 so as to coincide with the circumferential direction.
[0039]
In the above embodiment, the approximate position of the positioning mark is detected by the vibration sensing arm 31a of the vibration sensor 31 before the positioning mark is recognized by the camera 33 which is a positioning mark recognition means, and obtained from the vibration sensor 31. By selecting an image in which the positioning mark is photographed from the image information of the camera 33 based on the timing signal, the positioning mark can be quickly recognized and the processing content for recognition can be simplified. It is possible. In this case, it is also possible to perform shooting with the camera 33 only at the timing when it is estimated that the positioning mark can be shot using the timing of detection of the positioning mark obtained by the vibration sensor 31 without setting the camera 33 to the shooting state at all times. . Of course, it is possible to wait for the positioning mark to appear in the image while scanning the side surfaces of the upper mold 1 and the lower mold 2 without using the vibration sensor 31 at all.
[0040]
【The invention's effect】
As described above, according to the present invention, in the lens molding mold piece for constituting the lens molding mold body, the positioning mark is formed on the side surface over the predetermined display range. Since the positioning mark can be recognized from the side by rotating the mold piece or turning the measuring device, this positioning mark is aligned with a predetermined orientation, or the positioning marks of a pair of lens molding mold pieces are set. By aligning, it becomes possible to automate the positioning of the lens-molding mold piece in the rotational direction, and it becomes possible to position with high accuracy, so that it is possible to improve the productivity and the molding accuracy of the lens. .
[Brief description of the drawings]
FIG. 1 is an enlarged part showing a state in which an embodiment of a lens molding mold piece (upper mold, lower mold) according to the present invention is gripped by an upper shaft gripping portion and a lower shaft gripping portion in an embodiment of a lens manufacturing apparatus. It is sectional drawing.
FIG. 2 is a diagram illustrating the principle for positioning the upper mold and the lower mold in the rotational direction at the mold body forming position of the embodiment of the lens manufacturing apparatus according to the present invention.
FIG. 3 is a diagram illustrating the principle for positioning the upper mold and the lower mold in the rotational direction at the mold body forming position of the embodiment of the lens manufacturing apparatus.
FIG. 4 is a schematic view showing a photographed image of the side surface portion of the upper mold or the lower mold photographed by the camera of the embodiment of the lens manufacturing apparatus.
FIG. 5 is a schematic view showing a photographed image of the side part of another upper mold or lower mold photographed by the camera of the embodiment of the lens manufacturing apparatus.
FIG. 6 is a schematic configuration diagram showing a configuration of a detection system and a control system for positioning an upper mold or a lower mold in the rotation direction in the embodiment of the lens manufacturing apparatus.
FIG. 7 is a schematic view showing images taken simultaneously on the side surfaces of both the upper die and the lower die by a camera in different embodiments of the lens manufacturing apparatus.
FIG. 8 is an enlarged partial cross-sectional view illustrating a tape winding process in the embodiment of the lens manufacturing apparatus.
FIG. 9 is a front view showing the shape of a mold body completed after the tape winding step.
FIG. 10 is a state explanatory view showing a state at the start of winding in the tape winding step.
FIG. 11 is a state explanatory view showing a state at the end of winding of the tape winding process and at the time of cutting the tape.
FIG. 12 is a state explanatory view showing a state at the time of forming an ear picking portion after tape cutting in the tape winding step.
FIG. 13 is a schematic perspective view illustrating a configuration example of a transport, an upper shaft positioning unit, and a lower shaft positioning unit of the embodiment of the lens manufacturing apparatus.
FIG. 14 is a schematic perspective view showing an overall configuration example of an embodiment of a lens manufacturing apparatus.
FIG. 15 is a schematic perspective view showing an example of the structure around the mold body forming position in the embodiment of the lens manufacturing apparatus.
[Explanation of symbols]
1 Upper mold
1a, 1b, 1c, 1d, 2a, 2b, 2c, 2d
2 Lower mold
4 Transport
5 Upper mold positioning unit
6 Lower mold positioning unit
8 Tape cassette
10 Upper shaft unit
11 Upper shaft
12 Upper shaft gripping part
14 Resin tape
15 Tape holding unit
16 Tape winding roller unit
17 Tape cutting unit
20 Lower shaft unit
21 Lower shaft body
22 Lower shaft gripping part
31 Vibration sensor
31a Vibration arm
32 Light source
33 Camera

Claims (4)

Lens molding in which the molding surfaces of a pair of lens molding mold pieces each having a molding surface for molding an optical surface of a lens and a side surface adjacent to the molding surface are arranged to face each other at a predetermined interval. A lens manufacturing apparatus for constituting a lens molding mold body provided with a cavity for use,
A pair of gripping mechanisms for rotatably holding the pair of lens molding mold pieces, a recognizing means for visually recognizing the side surface of the lens molding mold piece, In order to cause the recognition means to recognize the positioning mark formed on the side surface portion, at least one of the lens molding mold pieces is rotated, and a pair of the above-mentioned information is recognized by the recognition means based on the positioning mark. Rotation control means for rotating at least one of the lens molding mold pieces relative to the other to match the positional relationship in the rotational direction between the pair of lens molding mold pieces, and an outline of the positioning mark An approximate position detecting means for detecting a position, and the approximate position based on the positioning mark The information detected by the detecting means, the recognition means lens manufacturing apparatus characterized by limiting the recognition region of the rotational direction selected or purview of the side portion of the lens forming mold pieces.   The mold interval control means according to claim 1, wherein a mutual interval between the pair of lens molding mold pieces is set, and a pair of the gripping mechanisms are driven to adjust the mutual interval between the lens molding mold pieces to a set value. A lens manufacturing apparatus comprising:   3. The method according to claim 2, wherein the side surface portions of the pair of lens molding mold pieces are connected to each other by the rotation control means and the interval control means, and the side surface portions of the pair of lens molding mold pieces are connected. A lens manufacturing apparatus comprising: a winding fixing means for winding and fixing a sealing member that seals the gap.   4. The winding fixing means according to claim 3, wherein the sealing member supplying means for supplying the sealing member to the side portions of the pair of lens molding mold pieces and the pair of lens molding mold pieces are integrated. And the winding of the sealing member has been completed, and the winding control means for controlling the sealing member supply means and the gripping mechanism so that the sealing member is wound in the circumferential direction of the side surface portion A lens manufacturing apparatus comprising: a sealing member cutting processing unit that cuts the sealing member later to perform end processing of the sealing member.

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