JPS6287312A - Method of positioning mold for molded plastic lens - Google Patents

Abstract

PURPOSE:To enhance the working efficiency and improve the positioning accuracy by a method wherein the position of the central part of the molding surface of the first mold is measured and the position of the direction of the optical axis of the second mold is calculated with respect to said position of the central part of the molding surface of the first mold. CONSTITUTION:Firstly, a lower mold 1 is seated on a suction cup 9 and then a chuck 5 for the lower mold is closed. Secondly, an upper mold 2 is seated on the chuck 5. Thirdly, a chuck 7 for the upper mold 2 is closed so that the position of the upper mold 2 is mechanically so restricted from its peripheral edge part as to coincide its center position with the center position of the lower mold 1. Fourthly, the upper mold 2 is held with a cup 10. Fifthly, the position of the apical surface of the lower mold 1 is measured with a position gauge 17. Measured signals are sent to a data processing unit 15 so as to calculate the vertical position (position on an optical axis 19) of the upper mold 2 with respect to the lower mold 1 by being combined with signals sent from a data input unit 16 in the data processing unit 15. Sixthly, a pulse motor 14 is rotate by the predetermined number of pulses due to the signal sent from the data processing unit 15 in accordance with the calculated value in order to control the upper mold 2 so as to vertically shift it by the predetermined amount.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for determining 117M of a pair of -[- leads used when molding a plus deck lens.

[Prior Art] Conventionally, a cast molding method has been known in which a plastic lens is molded by filling a plastic raw material into a cavity formed between a pair of molds facing each other at a predetermined interval. In this cast molding, in order to mold a plastic lens with high precision, the problem is how accurately a pair of molds can be set in a predetermined position.

Mold cellar 1 - As a method, position a pair of molds by sandwiching a tongue-shaped spacer between the molds, then remove the space between the molds with a hole, and then return the molds to their original positions. There is a known method in which a cavity is formed by placing an adhesive tape between the two molds in close contact with each other around the two molds (Japanese Patent Publication No. 1983).
-29333).

If this method is used, the parallelism of the two molds and the mold spacing can be determined to a predetermined state simply by sandwiching a spacer between the two molds, making it possible to easily perform high-precision positioning. .

[Problems to be Solved by the Invention] However, in the above method, the spacer is used to temporarily form the mold, and after the spacer is removed, the mold is temporarily molded for 1 fl.
The positional relationship of the IFt must be returned with high accuracy, and there is a problem that the positioning work of the mold becomes twice the work and the work efficiency is poor.

Further, it is necessary to have a large number of spacers of different sizes to correspond to various lenses, and there is a problem that the production and management of spacers becomes enormous.

Furthermore, the spacer must be removed after the temporary phase, but since it is a ring-shaped spacer, one of the circumferential walls of the spacer must be formed uniformly during removal. There is a problem in that there is a problem that foreign matter may get mixed in between the molds and leak.

If a cheap item is mixed in, will the lens become a product? 1 is each [J loss I 1 is sleeping.

The present invention provides the above-mentioned temporary phase work, production and management of substrate 1J in addition to the conventional method using a space.
In order to solve the problem of -1 or (Luns product?; 11- j] The purpose is to provide law.

[Measures to Solve the Problems] 91 A method for determining the head of a plastic lens mold according to the present invention in accordance with this purpose. In the method of positioning the molds in a predetermined state, first, the positions of a pair of opposing molds are constrained from the peripheral edge side, thereby aligning the center positions of the pair of molds, and then adjusting the parallelism of the pair of molds. Hold each mold from both sides with a pair of opposing holders, then measure the position of the center of the mold use surface of the first mold at the back of the pair of molds, and measure the second A method of calculating the position of the mold in the optical axis direction and controlling the movement of the holder holding the second mold in the optical axis direction so that the second mold comes to the calculated position. Become.

The h1 measurement of the position of the center of the mold use surface of the first mold is performed, for example, with respect to a certain reference plane of the device, and the position in the optical axis direction to be set of the second mold is calculated and moved. Control is also performed relative to that reference plane.

[Operation] In such a method, a pair of molds are positionally restrained from their peripheral edges so that their centers are aligned, and in this state they are held from both sides by parallel holders. Therefore, the pair of molds are first set so that the opposing surfaces are in a predetermined parallel state and the optical axes are aligned. Next, the thickness of the lens, that is, the distance between the molds is determined. The position of the center of the first mold is measured, and the optical axis direction to be set for the second mold is determined for each h11 piece, including the pre-known shape of the second mold. The position is calculated. Second: The holder holding the shield is controlled to move in the optical axis direction based on the above calculation result, but this movement maintains the parallelism between the molds and the alignment of the optical axes. J: The pair of molds is finally determined to have a predetermined positional relationship by movement control.

Therefore, it is possible to position the mold in a predetermined position without using a ring-shaped spacer as in the past, and the space υ
Since the temporary positioning work of the molds using - is eliminated, the positioning work between the molds is substantially reduced to - times, and the work efficiency is improved and it is also possible to improve the positioning accuracy.

-〇- Also, since the position of the mold can be determined to an arbitrary set value based on the implicit value, the conventional problems of manufacturing and managing a large number of spacers are completely eliminated.

Roughly speaking, the centers of a pair of molds are aligned by positional restraint from the periphery, and after alignment, the positional restraint jig can be opened in the radial direction of the molds, and there is no need to pass the molds between them, so foreign matter can get mixed in between the molds. The chance of contamination of the lens being molded is also reduced.

[Embodiments] Preferred embodiments of the present invention will be explained below with reference to the drawings.

1 and 2 show an apparatus for carrying out a method for positioning a plastic lens mold according to an embodiment of the present invention. In the figure, 1 and 2 indicate a pair of molds for molding a plastic lens, and inside a cavity formed between a lower mold 1 as a first mold and an upper mold 2 as a second mold facing each other. A re-lens is formed by filling the plus book with rough stones.

3.4 shows the lower mold centripetal device and the upper mold centripetal device which align the centers of the molds 1 and 2 from their peripheral edges.

The lower tension centripetal device 3 connects the chuck 5 to the mold 1, which can slide horizontally on the base 1M surface A-1.
Moved in the radial direction of 1! The upper mold centripetal device 4 moves the book 7 and the chuck 7 in the radial direction of the mold 2, which are horizontally slidable on a reference plane B1 formed on the upper surface of the chuck 5. cylinder 8
l) It is 1.

” - On both sides of the lower 1st 1st lead 1.2, there is a mold 1.
Cup 9 that can hold 2 and has holding surfaces facing parallel to each other.
．． 10 has been established. In this embodiment, the cups 9 and 10 are suction cups, and are configured to be rotatable. The ten cup 10 is supported so as to be vertically movable via a rod 11, and is moved by a cylinder 12 by a cylinder 12 when a large vertical movement is performed, and by a threaded portion 13 when a small vertical movement is performed. The position can be controlled by a pulse motor 14 via the motor.

The pulse generator 14 is connected to a data processing device 15 and is operated based on a signal from the data processing device 15. The data processing device 15 is connected to a data input device 16, and the data input device 16 and the position measuring device 1
Based on the signal from 7, the signal sent to the pulse motor 14 is processed. The position measuring instrument 17 is capable of measuring the position of the mold in a non-contact manner, and in this embodiment is comprised of an optical sensor type image sensor capable of detecting the position of the top surface of the lower mold 1. Reference numeral 18 denotes a data output device connected to the data processing device 15. Although it does not need to be provided, if it is provided, it is possible to display or print out the mold assembly results table of the mold 1.2.

The method of the present invention is carried out as follows using the apparatus of the embodiment configured as above.

First, the lower mold 1 is placed on the suction cup 9,
Chips 1/5 for the lower molding F are closed.

In this state, the position of the lower mold 1 is restrained from the peripheral edge so that the optical axis 19 of the mold 1 is aligned with the axis of the cup 9, and the lower mold 1 held on the upper surface holding surface of the horizontal cup 9 is also kept horizontal. In addition, since the chuck 5 is slid on the horizontal reference plane A1], the -L surface of the chuck 5 is the thickness of the chuck 5 set in advance. A constant horizontal reference plane B positioned above and covering the reference plane is constructed.

Next, the -F upper mold is placed on the jisek 5.

Since the upper surface of the chuck 5 constitutes a horizontal base 1M surface B, the upper mold 2 is kept in a horizontal state simply by being placed on the shell. After that, L-E-Lold 2
The holder 7 is closed, and the position of the -F mold 2 is mechanically restrained from its periphery, so that its center position coincides with the center position of the lower mold 1, that is, its optical axes coincide with each other. Thereafter, the cup 10 for adsorbing the upper mold 2 is lowered, and the upper mold 2 is held by the cup 10.

Next, in this state, open the hair 7 and place the upper mold 2.
While holding it in the cup 10 and lifting it slightly upward, move it to the upper surface position of the center of the lower mold 1, that is, lower mold 1.
The position of the top surface of is measured by the position measuring device 17. The cutting signal is sent to the data processing device 15, and the data processing device 1
5, the downward position of the upper mold 2 with respect to the lower mold 1 is calculated together with the signal from the data input device 16.

This calculation is performed using the distance between the centers or the distance between the peripheral parts of the molds 1.2 so that the center part thickness or peripheral thickness of the lens molded between the molds becomes a predetermined thickness. More specifically, for example, as shown in FIG. It is calculated as the position of the lower surface of the peripheral edge of the mold 2. That is, the top surface position C of the lower mold 1
and J='E- The lower surface position of the peripheral edge of the mold 2 is used as a reference plane for setting the mold interval. Of course, in the calculation, data of the R shape of the upper and lower molds 1.2, which is known in advance, is manually input and used.

Next, a signal is sent from the data processing device 615 to the pulse motor 17I, and the pulse motor 171 is rotated by a predetermined number of pulses (-1).
, [11], - The lead 2 is controlled to move in a predetermined vertical direction, that is, in a direction along the light 4 (1119).

The shield holding surfaces of the opposing cup 9.10 are parallel to r7, and are maintained in a parallel state during the movement control, and the optical axes of the mold 1.2 are also kept aligned.
Since the SI interval is set, 41'/,'u after determining the 117- field 2 is parallel to the lower mold 1 [the positional relationship determined at a predetermined interval between the mouth and the center position. 1? tsu1- is done.

It is also possible to position a pair of sea urchins using a subere, and it is also possible to position a pair of seven sea urchins using a subere.
By using measuring instrument 17 and pulse motor 14,
Arbitrary mold spacing (right next to the lens) (enables precise positioning).

Although the pulse motor 14 is used in this embodiment, any other suitable high-precision movement control means may be used, and the position measuring device 17 may be any device that can perform non-contact measurement. It is possible to use

[Effect of the invention] As explained above, according to the present invention, the following <
rVarious effects are 1q.

First, since there is no need to use conventional spacers, there is no need for their production and management, and since the mold spacing can be set to any value, it is possible to easily accommodate a wide variety of lens specifications.

Furthermore, the mold spacing can be determined by positioning one of the molds only once, thereby improving work efficiency and almost eliminating the possibility of errors occurring during positioning work. Therefore, by using the high-precision movement control means and high-precision position measuring device as shown in the embodiment apparatus, it is possible to improve mold positioning accuracy.

In addition, there is no need for temporary mold assembly using spacers,
Moreover, since the operation according to the present invention can be almost completely automated, manual work can be simplified and the amount of time required for disposal can be increased.

Furthermore, during positioning, the mold is positionally restrained from the periphery, but the position restraint tool does not cross between the molds, so the chance of foreign matter entering between the molds is reduced to 1J.
A clean lens molding cavity is formed between the molds. Therefore, it is also possible to improve the quality of cast-molded Plus Deck lenses.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of a positioning device for actually IMing a) head determination method of a plus deck lens mold according to a practical example of the present invention, and FIG. Fig. 3 is a partial cross-sectional view of the bottle, showing the relationship between the mold and the reference surface. 1.2...Mold 3...Lower mold centripetal device = 14- 4...Upper mold centripetal device 5.7...Chuck 9.10... ...Cup 13...Threaded portion 14...Pulse motor 15...Data processing device 16...Data input device 17... Position h1 Measuring instrument 1B...Data output device 19...Optical axis

Claims (2)

[Claims] (1) In the method of positioning the pair of molds for molding a plastic lens between the pair of opposing molds, first, the positions of the pair of opposing molds are restrained from the periphery side, so that the center of the pair of molds is While aligning the positions, hold the pair of molds from both sides with a pair of parallel holders, and then measure the position of the center of the mold use surface of the first mold of the pair of molds. Then, calculate the position of the second mold in the optical axis direction with respect to the measurement position, and move the holder holding the second mold so that the second mold comes to the calculated position. A method for positioning a plastic lens mold, which is characterized by controlling movement in the optical axis direction. (2) A patent claim in which the position of the center of the mold use surface of the first mold is measured and the position of the second mold in the optical axis direction is calculated with respect to a predetermined reference plane. A method for positioning a plastic lens mold according to item 1.