JP3095151B2 - Manufacturing method of plastic lens for spectacles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a plastic lens for spectacles, especially a plastic lens for spectacles suitable for producing a progressive multifocal lens.

[0002]

2. Description of the Related Art A spectacle lens is prepared for personal use in any of myopia, hyperopia, presbyopia and astigmatism according to a prescription based on optometry.

On the other hand, recently, molded lenses made of plastic have been widely used in place of conventional glass lenses.
This is particularly noticeable in a progressive multifocal lens for both directions.

Conventionally, spectacle lenses are manufactured in advance as blanks and stocked, and polished in accordance with necessary conditions such as power and astigmatism angle according to the prescription of the customer, to obtain a spectacle lens for the customer, Alternatively, predict the contents of the prescription with high frequency and produce and stock it as a finished product in advance,
By selecting and using the lens that best suits the customer from among them. At this time, the customer's prescription data is ordered from a spectacle retailer to a manufacturing department of a predetermined lens maker by facsimile or the like, where it is again processed into manufacturing data for a manufacturing line and input to a management computer. I have.

[0005]

However, in order to manufacture a lens by polishing from a blank according to the prescription of an individual customer, it takes about one week from receiving an order until it reaches the customer's hand. Further, there is a possibility that a transcription error or the like of the manufacturing data may occur from the prescription data. Further, there is a problem that the cost is increased because high-precision processing machine equipment is required for polishing.

On the other hand, when preparing finished products in advance,
Although there is an advantage that it can be delivered to the customer's hand in a relatively short time, in the case of a bifocal spectacle lens, it covers all types of power, such as distance, near, astigmatism, combinations thereof, and lens size Has the problem that a huge amount of stock is required.

[0007] In view of the above, the present invention significantly reduces the time required for a process from receiving an order from a customer to shipping a product, enabling the supply of a product with quick and accurate specifications, reducing manufacturing costs, It is an object of the present invention to provide a method for manufacturing a plastic lens for spectacles, which can reduce inventory management, and in particular, can reliably provide a lens that meets a customer's prescription.

[0008]

SUMMARY OF THE INVENTION An object of the present invention is to form a lens on the basis of customer prescription data obtained from a retail store or the like. It uses a photo-curable plastic material, takes out a lens mold to be molded from a mold stocker based on customer prescription data, and corresponds to a specific mold that shifts the process from the start to the end of the molding process. A method of manufacturing a plastic lens for spectacles including a step of causing a mold transfer body to accompany a process flow and receiving the mold in the mold transfer body and returning the mold to a mold stocker again when the mold is discharged,
Also, the present invention uses a mold pallet for accommodating individual molds and a tray for accommodating a pair of upper and lower mold pallets for individually accommodating upper and lower molds as the mold transfer body. The type of lens molded according to the customer's prescription data on the transfer body containing the mold when removing the mold from
Having a preliminary step of providing a display unique to the lens such as a frequency or a manufacturing identification number, and cleaning the used and non-used surfaces of the upper and lower molds immediately before the mold assembling step of assembling the mold and molding a predetermined cavity. Having a cleaning step to be performed. Further, it has a means for predicting lens prescription data to be manufactured based on past orders received, and having a means for instructing manufacturing based on the predicted data when the operation rate of the manufacturing line is reduced, and transmitting online from a terminal such as a retail store. Receiving the prescription data of the customer to calculate a processing instruction value, and providing a start instruction of the process based on the calculated data.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments shown in the drawings.

For molding the lens in the method of manufacturing a plastic lens for spectacles according to the present invention, a photo-curable plastic (for example, urethane acrylic resin) is used as a plastic material.
As shown in the block diagram in FIG. 1, a work label issuing step 3, a work label sorting step 4, and a mold transfer, in which a customer's prescription data obtained at the time of receiving an order and data necessary for a molding step are issued by a printer 1 in a work label 2. It has a tray out label setting step 6 for sticking the work label 2 to the tray 5 as a body, and a preliminary step up to a mold matching step 7,
As a lens forming step 8, a tray setting step 9, a mold cleaning step 10, a mold assembling step 11, a plastic raw material injecting step 12, a pouring raw material polymerization step 13, a removing material step 14, a buffering step 15, a collation and detape step 1
6. The mold release process 17 is performed, and the process proceeds to the molded lens inspection process 18.

In the preliminary process, the content is divided based on the prescription data, that is, whether the product is an integrated product or a built-in product. In the case of a built-in product, a blank stock, a hard coat stock, or a hard coat + reflection is used. A work label 2 is issued in which necessary data (FIG. 2) is printed by the printer 1 in each of the prevention processing stocks. As shown in FIG. 2, the work labels 2 to be issued include "integrated products", "built-in products", "polishing payout products", "HC (hard coat) payout products", and "deposited payout products". In the data displayed here, the “manufacturing number” is replaced by the manufacturing number by the host computer 20 based on the rearrangement number at the time of receiving the order, and a 5-digit numerical sequence is used. In addition, "glass type (P
“Mold” refers to the upper mold 21 and “glass mold (A, C)
“Type” ”indicates two types of the lower mold 22.

The mold pallets 23 and 24 for accommodating the molds 21 and 22 are thin box-shaped ones having a size enough to accommodate one mold. The tray 5 for accommodating the mold pallets 23 and 24 is The mold pallet 23,
The two receiving portions 5a and 5b are adjacent to each other in a thin box shape so that two of the receiving portions 24 can be stored in parallel. In the mold stocker 25, the molds 21 and 22 are stored in the mold pallets 23 and 24 one by one, and are taken out or stored by a take-out means according to a take-out or storage instruction. .

In the work label issuing step 3, the customer's prescription data, the type of lens, the frequency, the manufacturing identification number, etc., processed by the host computer 20, are printed on the specific display contents (the display contents are exemplified in FIG. 2). The label 2 is issued as a work label 2, and the label 2 is obtained on the outer surface of the tray 5 or attached by mechanical means (label setting step 6). The pair of upper and lower mold pallets 23 and 24 taken out are stored in the tray 5 as one set.

The trays 5 are stacked and set at several places, and are carried out from the lower side of the stack to the cleaning step 10 immediately before the assembly step 11 of the molds 21 and 22 is started.
At this time, if the “processing priority” of the instruction content by the work label 2 is express, the tray is preferentially sent to the cleaning process 10.

In the cleaning step 10, the mold 21,
Cleaning of both surfaces thereof to make the light transmittance of No. 22 perfect, and cleaning of the peripheral surface in order to improve the adhesion of the tape in a later step. As shown in FIG. 3 to FIG. 6, this cleaning is performed on a sponge roll 2 such as urethane foam containing a cleaning liquid on the peripheral surface of each mold 21 or 22 in the first tank.
6, the chuck 27 (suction pad) holding the molds 21 and 22 is rotated at 500 to 1000 rpm, and the sponge roll 26 is rotated in the same direction for cleaning. At this time, the pressing force of the sponge roll 26 is controlled based on the measurement results of the outer diameters of the molds 21 and 22.
In the second tank, the used surface side of each of the molds 21 and 22 is chucked, and the sponge roll 28 is placed on the non-used surface by 200 to 500.
Wash by moving the mold outward from the center of the mold while rotating at rpm. At this time, the molds 21 and 22 are given the same rotation as described above, and the moving distance of the sponge roll 28 is controlled based on the outer diameter data of the molds 21 and 22, and the sponge roll 28 is moved outside the molds 21 and 22. When it reaches the end, it is separated from the molds 21 and 22.
In the third tank, cleaning is performed with pure water in the same manner as in the second tank. After being cleaned in this manner, an appropriate amount (2 to 3 cc) of IP is applied to the cleaning surfaces of the molds 21 and 22 in the fourth tank.
A (isopropyl alcohol) is applied and dried. At this time, the rotation speed of the chuck 27 is low during the IPA coating and high during the drying (see FIG. 7). The cycle time is about 20 seconds, but the actual required time is within 13 seconds if the transport time is subtracted. You can end with
After cleaning and drying of the non-use surface are completed,
Before entering the tank, the molds 21 and 22 are turned over and chucked so that the use surface is on the upper side.

In the fifth, sixth and seventh tanks, the mold 2 is formed by the same process as in the second, third and fourth tanks.
Cleaning and drying of the used surfaces 1 and 22 are performed. However, in the seventh tank, in order to control the adhesion between the surface to be used and the plastic raw material, for example, IPA containing 50 to 3000 ppm of a cationic activator is applied and dried. Thereby, the releasability of the plastic raw material can be improved. After the processing in the seventh tank is completed, it is transferred to the mold assembling step 11.

FIG. 8 to FIG. 10 show an example of the mold assembling step 11. In this embodiment, the upper mold 2
The upper and lower molds 21 and 22 are transported by conveying means 29 and 30 (specifically, by a belt) for the first mold 22 and the lower mold 22.
Are transported, and the molds 21 and 22 are gripped by the set jigs 31 and 32 from these transporting means 29 and 30 and transferred to the positioning section 33.

The positioning portion 33 supports the lower surfaces of the front and rear ends in the diametrical direction of each of the molds 21 and 22 as shown in FIG. 8 and has an interval at which the mold holders 34 and 35 can be inserted between the molds 21 and 22. And placed along the upper surfaces of the mold receiving bases 36, 36 and 37, 37 arranged in a completely horizontal state, and facing the front and rear end faces in the diametrical direction of the molds 21 and 22 placed over the opposite ends of the mold receiving bases. It has a pair of centering tools 38, 38 and 39, 39 that move evenly, and the opposed end faces of the centering tools have a V-shaped shallow planar shape so as to contact two points on the peripheral surfaces of the molds 21 and 22. The contact edges 38a and 39a are provided.

Therefore, the upper and lower molds 21 and 22 are placed on the respective mold receiving tables 36, 36, 37 and 37, whereby the parallelism of the molds 21 and 22 is obtained on the upper surface thereof, and the centering tools 38, 38, The optical axes of the molds 21 and 22 are extended by being clamped between the contact edges 38a, 38a and 39a, 39a by the approaching movement of the molds 39, 39, thereby positioning the molds 21, 22.

The mold holders 34, 35 are
The servomotor is moved toward and away from the center of the rear surface of the molds 22 and 22, and the tip ends thereof are suction pads for sucking and holding the molds 21 and 22 without losing their parallelism, thereby holding the molds 21 and 22 by suction. You.

As shown in FIG. 10, the molds 21 and 22 are provided with indicia 40a and 41a serving as indices on their peripheral surfaces for astigmatic axis alignment. The engraved positions are detected by an optical sensor. The axis of astigmatism between the upper and lower molds 21 and 22 is aligned. This operation is performed by rotating the mold holders 34 and 35. At this time, stamps 40a and 41a
In order to prevent erroneous detection of marks other than the above, marks 40b and 41b are also provided at positions shifted by a predetermined angle from the reference position,
First, it is desirable that the first mark 40a, 41a be detected and then rotated by a predetermined angle, and the time when the second mark 40b, 41b is detected be regarded as a normal position (reference position).

After detecting the reference positions of the molds 21 and 22, the lower mold 22 is rotated by an angle corresponding to the axis of astigmatism, and after the lower mold 22 rotates, the lower mold 22 corresponds to the raw material injection position 42 formed on the upper mold 21. Lower mold 2
The edge thickness of No. 2 is measured by scanning with an optical sensor. As shown in FIG. 11, the raw material injection position 42 is formed of a notch 43 that is concave in a cross section in a radial direction of a peripheral portion of the upper mold 21, and an inner end of the notch 43 is formed around the lens to be molded. It extends to a slightly overlapping position. After measuring the edge thickness of the lower mold 22 corresponding to the raw material injection position 42 as described above, the mold holders 34 and 35 are moved on the same axis (FIGS. 8C to 8D). 22 are moved closer to each other in the axial direction so as to have a predetermined center thickness, and the center thickness is determined.
The adhesive tape 44 is wound so as to straddle the peripheral surface of the tape 22. Thus, a mold assembly 45 having a lens molding cavity formed therein is obtained.

The axis of astigmatism and the center thickness are calculated in advance by the PC-3, and are used for rotating the mold holders 34 and 35.
This is performed by controlling a servo motor for controlling the thickness.

Immediately before the winding of the adhesive tape 44 is completed, a print 46 having the same number (for collation) as the one attached to the tray 5 is made on the outer surface of the adhesive tape 44 by ink jet.

In the cleaning step 10 to the assembling step 11, the molds 21 and 22 are separated from the tray 5,
Tray 5 is a transport means that runs in parallel (for example, a belt conveyor)
Is transferred in synchronization with the flow of each process.

In the raw material injecting step 12, the mold assembly 45 is held so that the pouring position 42 determined in the assembling step 11 does not collapse.
4 shows the injection nozzle 4 of the injection head 47 as shown in FIG.
8 is pierced to inject the plastic raw material.

The adhesive tape 44 on both sides of the insertion position of the injection nozzle 48 is provided with two holes 49, 49 for venting air on both sides of the injection position before the injection step after winding the adhesive tape. An injection nozzle 48 is inserted between the holes to inject the raw material. As the injection of the raw material proceeds, the air in the cavity escapes from the holes 49,49. At this time, the inflow state of the raw material is such that the raw material has viscosity, so that the raw material gradually flows into both sides from the center of the cavity, and the injection nozzle 4
8, the air in the spaces a, a on both sides of the holes a, 49 on both sides.
Then, the air is exhausted, and the time when the air is completely exhausted and the raw material starts to come out of the holes 49, 49 is detected by the capacitance sensor 50, thereby detecting the filling state and stopping the injection.

After the injection of the raw material is completed, the injection head 47 is retracted, the injection nozzle 48 is pulled out, and the piercing hole is pressed against the tape surface using a tape-shaped jig 51 as shown in FIG. Pressed by means 52, light source 53 (FIG. 13)
(UV irradiation) to perform temporary polymerization. The jig 51 winds up the tape 51a so that the jig 51 is always held down by using a new tape surface.

At the time of injecting the raw material, as shown in FIG.
In order to avoid erroneous detection of a full state when transmitted to the inner surface of 22, the injection speed at the initial stage of injection was reduced, the speed was increased at the time when the flow path of the raw material was formed, and the state was close to the full state. Sometimes I set it to slow down again. Decreasing the injection speed at the end of the injection is to increase the detection accuracy. And this injection rate control
The PC-3 calculates the volume of the cavity in advance, and controls the valve-moving servomotor for adjusting the opening of the injection valve. When the injection speed is reduced at the end of the injection, the volume of the cavity is 60 to 95%.
% Is preferably at the time when the raw material reaches the maximum.

After the injection step 36, the mold assembly 4
5 is released and carried out to the next polymerization step 13.

The light irradiation time in the polymerization step 13 is 2.5 to 4 minutes in order to secure the physical properties of the lens.
The time corresponding to a minute is performed in an atmosphere of 120 ° C. ± 10 ° C., and the irradiation direction is performed from both sides of the mold assembly 45.

The raw material temperature after the polymerization step 13 is 16
Since it is a high temperature of 0 ° C. or more, and detaping and depolymerizing operations in the subsequent steps become impossible, a cooling period of about 10 minutes is provided in an atmosphere of 50 ° C. to 80 ° C.

On the other hand, according to the order in which the molds 21 and 22 are carried into the washing step 10, the tray 5 is also carried by the carrying means, and the mold assembly 45 is returned to the tray 5 by the robot (removal step 14). . After receiving the mold assembly 45 in the tray 5, in consideration of the speed of the manual operation part in the post-process, the buffer heat preservation process 15 for about 15 minutes in the above-mentioned atmosphere of about 50 ° C. to 80 ° C.
Put. At this time, the number displayed on the work label 2 affixed to the tray 5 is compared with the number printed on the adhesive tape 44 of the mold assembly 45, and its identity is confirmed.

After the above collation, a step 16 of removing the adhesive tape 44 to remove the adhesive tape 44, an operation of removing a polymer or the like which is easily accumulated at the boundary between the molds 21 and 22 and the adhesive tape 44, and then the lower mold 22 A wedge is inserted between the lens 53 and the molded lens 53 to separate them, and the upper mold 21 is peeled from the lens 53 to take out the lens 53 (mold release step 17). These detaping and releasing operations are performed manually, but it is possible to automate them.

After being released in this manner, the upper and lower molds 21 and 22 are returned to the corresponding mold pallets 23 and 24, respectively, and the molded lens 53 is transferred to another lens pallet 54. The work label 2 placed on the tray 5 at the same time
Replace on the outside surface of The empty tray 5 is returned to the tray storage area, and the mold pallets 23 and 24 from which the molds 21 and 22 have been returned are subjected to spin cleaning in a cleaning step 55, and at the same time, the appearance is checked and then the mold collation is performed. The passed product is stored in a predetermined position of the mold stocker 25.

On the other hand, the molded lens 53 is visually observed in the appearance inspection step 18 to determine the presence or absence of a defect such as a scratch or the presence of a contaminant. If it is determined by the appearance inspection that the product is defective, the defective item is key-input at the terminal, and a reproduction instruction is issued.

The lens 53 that has passed the appearance inspection is divided into a shift to a subsequent dimension inspection step and a system for stocking as a polished product.

In the dimension inspection step, the power, center thickness, prism and astigmatic axis of the lens 53 are checked. These checks are performed by an automatic lens meter and a digital gauge. The data of the lens 53 is read into a computer, and compared with the desired prescription data previously displayed (barcode display) on the work label 2 to make a judgment. Done. If it is determined in this step that the product is defective, a re-production instruction is issued together with the defective item, and the defective item is stored as measurement data and provided for technical analysis.

The lens 5 which has passed both appearance and dimensions
Since 3 is independent of the lens pallet 54, the lens itself is displayed so that the lens can be identified. This display does not necessarily have to be the same as the number assigned to the tray 5 (or the lens pallet 54), and may be any one that can be used in subsequent work steps.

The indication 56 on the lens is indicated by the shape of the notch 43 on the outer periphery of the lens 53 by the notch 43 formed in the upper mold 21 for injecting the raw material into the cavity of the mold assembly 45 (FIG. 16A). , (B)) using the convex portion 57 formed in a semi-cylindrical shape. Therefore, the present invention can be implemented by detecting the convex portion 57 by the contact type detecting means and engraving the peak 57 at the center thereof. In addition, the convex portion 57 may be detected by image processing and stamped. The use of a CO ₂ laser is suitable for this marking. In this engraving, the value of the position (radial position) to be engraved is received from the bar code of the work label 2 and engraving is performed. This is because the position is not affected when the periphery is shaved during the outer peripheral shaping step.

After the marking is made, the peripheral portion is cut by dry or wet grinding as shown in FIG. 17, and the outer periphery is shaped to a predetermined outer diameter. After the outer peripheral shaping is completed, pairing of a pair of lenses for the right eye and the left eye is performed, whereby the lens forming process is completed.

Among the molds used in the lens molding process, a convex mold having a contour of a convex mold portion close to the shape of the spectacle frame is used. Means for forming a lens having a substantially small diameter by combining a mold for use with the lens.

The lens thus formed is subjected to necessary processing such as hard coating, deposition of an antireflection film, and dyeing according to the prescription.

Each of the work steps of the above-mentioned cleaning step, assembling step and injection step is equipped with a personal computer (PC cell), and is controlled by M / C. Therefore, it is necessary to input the processing data of the corresponding lens (for example, lens center thickness setting value, lens diameter, astigmatism axis setting value, mold size, and injection information) to each cell PC. Therefore, the manufacturing number of the bar code attached to the lens or the pallet by the PC-3 is determined. Refer to the upper corresponding block PC
Can send the processed data to the PC cell. For input of these processing data,
At the time of tray setting before the washing process, the bar code attached to the tray 5 is read, and the mold 2 is transferred from the PC-3 to the PC cell.
Data is transferred along with the movement of 1 and 22. That is,
Only by reading the bar code at the time of tray setting, necessary processing data in the cleaning, assembling and pouring steps are input from the PC-3 to the PC cell at the timing of the mold movement. When the tray 5 is also conveyed in synchronization with the molds 21 and 22, the barcode is read from the tray 5 when the molds 21 and 22 enter each process, and the processing data is stored in P
C-3 can be input to the PC cell. That is, the processing data is input at the transfer timing of the tray 5. Either one of these two methods or a combination of both can be employed. Eventually, when the injection step is completed, the processing end information is sent to PC-3, a passage check is performed, and the result is input to block PC-1.

[0045]

As described above, according to the present invention, the container holding the mold housed in the mold stocker is moved by the transfer body along with the flow of the lens forming process during use of the mold. Since the mold after mold release is received again in the container and returned to the molded stocker, the mold and the mold container are always kept without losing the correspondence, and when the mold is stored in the mold stocker after the end of the process. There is no need to sort each time, and the mold can be reliably returned to a predetermined location when stored in the mold stocker.

Further, since the mold container is a mold pallet for accommodating one mold, and the transfer body is a tray for accommodating two mold pallets, the mold can be easily taken out and handled at the time of transfer, and the mold is not damaged. . Since various necessary data can be easily displayed (labeled) on the tray, it is possible to confirm that the mold is a predetermined one without confirming a mold to be used.
Further, based on the built-in data, built-in products can be manufactured when the operation rate of the manufacturing line is reduced, and the productivity can be increased.

[Brief description of the drawings]

FIG. 1 is a process chart showing one embodiment of a lens forming process in the present invention.

FIG. 2 is an explanatory diagram showing an example of contents of display data of a work label used in FIG. 1;

FIG. 3 is an explanatory view showing one means of cleaning the peripheral surface of a first tank of the mold in the cleaning step of FIG. 1;

FIG. 4 is an explanatory view showing one means of cleaning the surface of the second tank.

FIG. 5 is an explanatory view showing a cleaning means in a third tank.

FIG. 6 is an explanatory view showing an IPA application state in a fourth tank and a supporting state in a fifth tank.

FIG. 7 is a graph showing the number of rotations and time during IPA coating and spin drying.

FIGS. 8A to 8F are explanatory views showing an example of the mold assembling step of FIG. 1;

FIG. 9 is a plan view showing a positional relationship between upper and lower molds in each step of FIG. 8;

FIGS. 10A and 10B are explanatory diagrams showing astigmatic axis detection indices of upper and lower molds.

FIG. 11 is a perspective view showing a notch formed in the upper mold.

FIG. 12 is a front view showing an example of a plastic material injection head.

FIG. 13 is a sectional view showing a state in which a plastic raw material is injected into a mold assembly by an injection head.

FIG. 14 is an explanatory diagram showing an internal situation as viewed from the front.

FIG. 15 is an explanatory view showing one means for sealing an injection port after injection of a plastic raw material.

FIGS. 16A and 16B are front views showing the positional relationship of marking on a molded lens.

FIG. 17 is a front view showing the lens after the outer periphery is shaped.

[Explanation of symbols]

 2 Work label 5 Tray 21 Upper mold 22 Lower mold 23,24 Mold pallet 25 Mold stocker 26,28 Sponge roll 33 Positioning part 34,35 Mold holder 36,37 Mold receiving table 38,39 Centering tool 42 Raw material injection position 43 Notch 44 Adhesive tape 45 Mold assembly 47 Injection head 48 Injection nozzle 50 Capacitance sensor 51 Tape holding jig 53 Molded lens 54 Lens pallet 57 Convex part

──────────────────────────────────────────────────続 き Continuation of the front page (51) Int.Cl. ⁷ Identification symbol FI // B29K 105: 24 B29L 11:00 (56) References JP-A-2-80232 (JP, A) JP-A-1-198311 (JP, A) JP-A-61-132309 (JP, A) JP-A-50-135163 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B29C 39/02-39 / 08 B29C 39/22-39/44 B29C 33/30-33/36 B29C 33/70-33/72 B29D 11/00 G02B 1/04 G02C 7/02 B23Q 3/155-3/157

Claims (5)

(57) [Claims] 1. Using a photocurable plastic material, take out a lens mold to be molded from a mold stocker based on customer prescription data, and correspond to a specific mold that shifts the process from the start to the end of the molding process. A method of manufacturing a plastic lens for spectacles, comprising the steps of causing a mold transfer body to accompany the process flow, receiving the mold when the mold is discharged, and returning the mold to the mold stocker again. 2. The mold transfer body according to claim 1, wherein a mold pallet for accommodating individual molds and a tray for accommodating a pair of upper and lower mold pallets for individually accommodating upper and lower molds are used. A method for producing a plastic lens for spectacles. 3. A preliminary step of providing a display unique to the lens, such as the type, frequency, or manufacturing identification number of a lens to be molded according to customer prescription data, on a transfer body accommodating the mold when the mold is removed from the mold stocker. The method for producing a plastic lens for spectacles according to claim 1, comprising: 4. A plastic lens for spectacles according to claim 1, further comprising a cleaning step of cleaning upper and lower used and unused surfaces of the mold immediately before the mold assembling step of assembling the mold to form a predetermined cavity. Production method. 5. A lens corresponding to predictive prescription data is molded from a photo-curable plastic material, and an indication of the lens, such as the type, frequency, or manufacturing identification number of the molded lens, is given to the lens or its transfer body. The method for producing a plastic lens for eyeglasses according to claim 1, wherein the method includes a display step, and the step of forming and forming a stock lens.