JPH03193332A - Monolithic molding method for optical system such as lens and frame, mold and monolithic molded product - Google Patents

Abstract

PURPOSE:To enable molding of a monolithic molded product obtained by holding an optical element such as a lens with a frame in a series of molding processes in a mold, by a method wherein optical elements, which are to constitute optical systems, abut against a hitting surface while their optical axes are coincident with each other, a frame molding cavity is formed in the circumferential part and a frame is molded integrally with the optical element through the cavity. CONSTITUTION:The second lens 60 held by a movable mold 32 is positioned at a position where an axis of the same becomes coincident with that of the first lens 70 held by a stationary mold 31. Hitting surfaces 1a, 6a of the first lens 70 and second lens 60 are set up under a state where they abut against each other by performing clamping of a stationary mold 31 and movable mold 32. Then a frame molding cavity 20 is formed of slide parts 2b, 7b to which a frame molding sprue 16 is joined by pulling a stationary side and movable side slide members 2, 7 respectively into a stationary mold 31 and movable mold 32 side by actuating actuators 3, 8. Then frame molding resin is filled into the frame molding cavity 20 and molding under a necessary molding state is performed.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a method for integrally molding an optical system in which a plurality of optical elements such as lenses are arranged in an axial direction, and a frame such as a lens barrel that holds the optical system, and a method for molding. Regarding molds and integrally molded products.

[Conventional technology]

Conventionally, when holding an optical system while arranging a plurality of optical elements such as lenses in the optical axis direction, the optical system is arranged inside the lens barrel in the optical axis direction, and then the holding ring is attached to the holding ring. It was usual to construct it by fixing it with a

However, in order to eliminate the drawbacks such as the complexity of the assembly work and the variation in optical precision of the configuration in which the interior is fixed inside the lens frame via a presser ring, a manufacturing method and apparatus for integrally molding the optical system and the frame have been developed. , integrally molded products have been developed.

A known example is ``a plastic structure characterized by a plurality of lenses connected in the optical axis direction and integrally molded with a plastic material together with a plurality of bars supporting these lenses'' (Japanese Unexamined Patent Publication No. 62-70810). (Refer to Japanese Patent Publication No. 2003-110002) Alternatively, [a cavity having a cylindrical space of a plastic mold for injecting molten plastic and solidifying it to obtain a product has at least one step, and the cavity has an optical lens and a space between them. inserting rings alternately into a cylindrical cavity formed by the optical lens and the spacer ring;
``Method for manufacturing a lens system characterized by integral molding by injecting molten plastic'' (Japanese Patent Application Laid-Open No. 58-98225
(Refer to the above publication) and ``having an automatic centering mechanism in the mold that includes a support member that is movable within a plane perpendicular to the lens optical axis and that supports the lens at at least three points on the outer periphery of the lens. "A device for integrally molding a lens and a lens frame" or "a means for preliminarily holding a lens, a support member movable in a plane perpendicular to the optical axis of the lens and supporting the lens at at least three points on the outer circumference of the lens" The mold has an automatic centering mechanism in the mold, and when the lens is supported by the support member, a gap is formed between the holding means and the lens to a degree that prevents the resin for forming the lens frame from passing through. lens to
Examples of the "lens frame integral molding device" (see Japanese Patent Application Laid-open No. 16820/1983) can be cited.

[Problem to be solved by the invention]

However, the integrated molding of the optical system and the frame, the molding method, and the apparatus in each of the above-mentioned known examples are all insert molding, and the insert parts such as the lens or spacer ring to be inserted are molded separately in advance. The interior work is required, and no technology has yet been developed that can sufficiently eliminate the disadvantages of the conventional construction, which involves fixing the interior inside the lens barrel with a presser ring, such as workability and variations in optical precision, in terms of industrial production. is the current situation.

Therefore, the present invention was developed in view of the current situation, and includes a series of methods for molding an optical system such as a lens, molding a frame for holding this optical system, and molding these optical systems and the frame integrally. The object of the present invention is to provide an integrally molded product, a molding method, and a molding die that can be molded in a series of steps.

(Means and effects for solving the problems) The present invention includes a step of molding optical elements such as a plurality of lenses using an injection mold consisting of a fixed mold and a movable mold, and a process of molding optical elements such as a plurality of lenses by rotating the movable mold. A process of aligning the optical axes of the optical elements that constitute an optical system among a plurality of optical elements such as lenses and abutting each optical element on a contact surface, and forming a frame on the outer periphery of each optical element. A method for integrally molding an optical system, such as a lens, and a frame, which comprises a step of forming a cavity for the lens and molding the frame integrally with each optical element constituting the optical system through the cavity, from a fixed type and a movable type. In the injection mold, one of the two molds is rotatably held, and both molds are provided with molding cavities for a plurality of optical elements such as lenses, and each of the molding cavities for each optical element is provided with molding cavities for molding a plurality of optical elements such as lenses. at least one spool whose outer periphery is slidable and which fills a molding resin into a molding cavity of each optical element and a frame molding cavity of the optical element formed by sliding the outer periphery; An injection mold for integrally molding an optical system such as a lens and a frame, and an injection mold for integrally molding a plurality of lenses, characterized in that each cavity is provided with a runner and a gate connected to a spool. In an integrally molded product formed by molding an optical element such as the above and integrally molding it with a frame, the joint surface of each optical element and the frame is configured to be undercut with respect to the inner diameter in the optical axis direction. An integrally molded product comprising an optical system such as a lens and a frame, and an integrally molded product formed by molding a plurality of optical elements such as lenses using an injection mold and molding the same integrally with the frame, which are characterized by: An optical system such as a lens and a frame, characterized in that the cross-sectional shape perpendicular to the optical axis of the joint surface of the optical element and the frame is formed into an uneven shape to increase the contact area between each of the optical elements and the frame. It is an integrally molded product.

Therefore, the present invention is capable of molding an optical system such as a lens and a frame in a series of steps, which are required for the construction of an integrally molded product of an optical system such as a lens and a frame, in the same injection mold. The integral molding of the frame and the frame is performed simultaneously with the molding of the frame, which improves workability and eliminates variations between each body molded product. The joint configuration increases the joint area between the optical system and the frame.
The durability can be improved.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

(First Embodiment) Figs. 1 to 12 show a first embodiment of the present invention, in which Fig. 1 is a sectional view of an injection mold, and Figs. 2 to 6 are sectional views showing the molding process. Figures 7 and 8 show the first lens and the second lens.
Cross-sectional view showing a modified example of the integrally molded portion of the lens and frame, No. 9
Figures 10 and 10 show modifications of the outer periphery of the first and second lenses. Figure 9 is a perspective view of the second lens, Figure 10 is a sectional view of the movable slide member, and Figure 11 is a cross-sectional view of the movable slide member. FIG. 7 is a sectional view showing a modification different from FIGS. 8, and FIG. 12 is a plan view schematically showing essential parts of the injection mold of FIG. 1.

Now, the injection molding die 30 shown in the first figure is constructed by disposing a movable die 32 with respect to a fixed die 31 so as to be rotatable and movable in opposite directions.

The fixed mold 31 is attached to the fixed mounting plate 21 via the fixed mold plate 9 to form the first and second lens molding inserts 33 and 34.
At the same time, a cylindrical fixed side slide member 2 is fitted onto the outer periphery of the second lens molding insert 33 so as to be slidable in the vertical direction. An actuator 3 is mounted to move the slide member 2 in the vertical direction via a gear 3a that is screwed into a threaded portion 2a screwed on the outer periphery of the slide member 2.

Further, the fixed mold 31 is provided with spools 23 for forming the first and second lenses at the center and a spool 16 for forming the frame on the left side, and on the upper outer periphery of the second lens forming body 34, The second part of the movable mold 32 to be described later
A fitting portion 37 of the movable slide member 7 is provided on the outer periphery of the lens molding member 13.

Furthermore, the molding surface 34a of the second lens molding member 34
A molded portion of the abutment surface 6a is provided on the outer circumferential portion of the first lens 70, and a molded portion of the abutment surface 6a is provided on the upper part of the fixed side slide member 2, and a portion facing the runner 27 that communicates with the spool 23 is provided. A gate 5 for forming the first lens 70 is provided.

The movable mold 32 also attaches the first and second lens molding members 11 and 13 to the movable mounting plate 22 via the spacer block 42, the movable receiving plate 14, and the movable mold plate 4.
One insert 11 is fixed to the protruding plate 12 with bolts 38,
The other insert 13 is fixed and attached with bolts 39, and a cylindrical movable slide member 7 is fitted on the outer periphery of the insert 13 so as to be movable in the vertical direction. An actuator 8 is mounted to move the movable slide member 7 via a gear 8a that is screwed into a threaded portion 7a screwed on the outer periphery.

Further, a runner 27 corresponding to the spool 23 and runner 27 of the fixed side template 9 of the fixed mold 31 is provided in the center of the movable side template 4, and a runner 27 is provided on the protruding plate 12.
A protruding pin 26 is fixed with a bolt 40, and a runner 17 and a gate 18 are provided on the right side to be connected to a spool 16 for frame forming, and a protruding pin 19 is fitted into the runner 17 so as to be movable up and down. The upper threaded portion 19a of the protruding pin 19 is meshed with the gear 8a of the actuator 8 to connect it.

Furthermore, a fitting part 41 for the stationary slide member 2 is provided on the left side of the movable mold plate 4, and a spring 15 is interposed between the protruding plate 12 and the movable receiving plate 14, and The plate 12 is connected to a protruding rond 28 of a molding machine (not shown).

Therefore, the injection mold 30 composed of the fixed and movable molds 31 and 32 is used by being attached to the platen of a molding machine like a normal mold, and in particular, the movable mold 32 has a rotating function. It is attached to a movable platen equipped with a

Further, the first and second lens molding members 11.33 and 13.34, which are pairs of the fixed and movable molds 31 and 32, respectively, and the fixed side and movable side slide members 2.
molding cavities 1.6 for the first and second lenses 60.70 are formed by the molding cavities 1.6 of the first and second lenses 60.70 (see FIGS. 1 and 12), and the sliding parts 2b and 7b of the fixed and movable sliding members 2.7 Frame molding cavity 20
(see FIG. 6) is formed.

Now, a molding method in which the second lens 60 and the second lens 70 are molded using the injection mold 30 having the above configuration, and the lens system consisting of both lenses 60 and 70 is integrally molded by molding the frame 81 will be described below. , will be explained in conjunction with FIGS. 2 to 6.

First, the fixed and movable molds 31 and 32 are closed, and the actuators 3 and 8 are actuated to slide the fixed and movable slide members 2 and 7 to bring the tips of the two into the fitting portion. 37 and 41, and connect and set both gates 5 and 10 to the runner 27.

Thereafter, the first and second lens molding cavities 1 and 6 are injected into the first and second lens molding cavities 1 and 6 through the injection base (not shown) of the lens molding resin injection machine that is set on the spool bush of the spool 23.
A molding resin is filled inside the lens (see FIG. 2), and molding is performed according to molding conditions that meet the conditions required for molding both lenses 60 and 70.

After waiting for the molded product to solidify as a result of molding in each of the cavities 1 and 6, the actuators 3 and 8
to move the fixed side and movable side slide members 2 and 7.
(As shown in FIG. 3, gate cutting is performed by pulling both slide members 2 and 7 into the fixed side and movable side slide parts 2b and 7b, respectively).

In connection with the completion of this gate cut, the fixed mold 3
By opening the molds 1 and 32, the molded product is held in the molding surface of the cavities 1 and 6, which has a larger area, as shown in FIG.

That is, as shown in FIG. 4, the first lens 70 is held by the fixed mold 31, and the second lens 60 is held by the movable mold 32.

In addition, in connection with mold opening, the movable side platen (not shown) rotates via its rotation mechanism, so that the movable mold 3
The second lens 6o held by the movable mold 32 is rotated and the first lens 70 is held by the fixed mold 31.
The protruding plate is positioned at a position that coincides with the optical axis of the movable mold 32, and is biased in the non-acting direction by the spring 15 by retracting the protruding iron 28 of the molding machine in conjunction with the operation of the movable mold 32. 12 and the first lens molding force 11 is retracted to a non-working position.

Furthermore, in relation to the operation, the fixed mold 31 and the movable mold 32
By closing the mold, the abutment surfaces 1a and 6a of the first lens 70 and the second lens 60 are set in contact with each other (see FIG. 5).

Note that, since the first lens molding mandrel 11 on the movable side has retreated to the inactive position, it does not interfere with the second lens molding mandrel 19 of the fixed mold 31.

When the first lens 70 and the second lens 60 are set with their optical axes aligned with each other, the actuators 3 and 8 are actuated to move the fixed side and movable side slide members 2 and 7 to the fixed mold 31, respectively. By pulling in the movable mold 32, the slide portion 2 is pulled in as shown in FIG.
A frame forming cavity 20 is formed at b and 7b, and a frame forming spool 16 is connected to this cavity 20 via a gate 18 and a runner 17.

Note that the first and second lens molding runners 27 are filled with solidified resin molded products 80 filled in the turning portions during molding of the first and second lenses, and are filled into the runners 27 again when the molds are closed. Forms a part of the frame molding cavity 20.

Therefore, the spool 16 is placed inside the frame molding cavity 20.
The spool bush is filled with frame molding resin from the injection tower of the frame molding resin injection machine, which is set in advance, and molding is carried out under the required molding conditions.

In addition, during frame molding, by lowering the mold temperature, the temperature of the filled frame molding resin can be lowered quickly, and the thermal influence on the first and second lenses 60 and 70 can be reduced. .

Thereafter, after the frame 81 shown in FIG. The molding is completed by ejecting the molded product 80 of No. 27 and removing the resin solidified inside the gates 5 and 10 of the fixed and movable slide members 2 and 7 using an air blower (not shown) or the like.

Therefore, after that, the movable platen rotates the movable mold 320 times, each of the above-mentioned parts returns to the original position shown in the first figure, and the same steps as described above are repeated from the second figure onward to complete the lens system. The integral molding of the frame and frame can be continuously and automatically performed.

In addition, the first and second lenses 60.70 in the above molding
Examples include using optical grade polycarbonate as the molding resin and glass fiber polycarbonate as the frame molding resin, but it is of course possible to mold both with the same resin. , and not compressed by these synthetic resins.

In addition, the heat-resistant temperature of the lens molding material must be higher than the optimal mold temperature for molding the frame molding material, but if it has a heat-resistant temperature higher than the molding temperature of the frame molding material to be injected. More suitable.

Furthermore, the injection mold 30 includes two molds for different materials.
Since the molding machine has two spools I6.23, two injection towers are required, and the nozzles of the two injection towers may be always set on the two spool bushes of the mold,
The injection tower may be driven in synchronization with the movement of the mold so as to turn the nozzle only during injection.

Moreover, FIGS. 7 to 11 show examples of design changes to the above embodiment, and FIGS. 7 and 8 show the molding surfaces of the outer edges of the molding cavities 1 and 6 of the first and second lenses. That is, by providing the step portions 2a, 7a on the upper portions of the fixed side and movable side slide members 2 and 7, the protrusions 61a, 71a are formed on the outer diameter portions of the first lens 71 and the second lens 61 to be molded. and when forming the frame, the protrusions 61a, 71a are the protrusions 81a of the frame 81.
The first and second lenses 61, 71 are integrally molded to form an undercut, thereby preventing the first and second lenses 61, 71 from being removed, etc., and making it possible to form a solid integrally molded product.

In addition, FIGS. 9 and 10 show that when molding the first and second lenses 60, 70, both cavities 1 and 6
The shapes of the inner circumferential surfaces of the fixed side and movable side slide members 2 and 7 are changed in design from the above embodiment, and a recess 7c is formed on the inner circumferential surface.
, by continuously forming the convex portions 7d, the concavo-convex portions 60a, 60b are formed on the outer periphery of the second lens 60 to be molded, and when the frame 81 is integrally molded thereon by the method described above, the second lens
The bonding area between the lens 60 and the frame 81 can be increased, and the adhesion between the two can be improved. Although only the second lens 60 and the movable slide member 7 are shown in FIGS. 9 and 10, the design of the first lens 70 and the fixed slide member 2 can be changed in a similar manner.

Furthermore, FIG. 11 shows the first and second lenses 62.
The respective molding cavities 1 and 6 are constructed so that step portions 62a and 72a that can be fitted into each other are molded when molding the outer edge portions 62a and 72a of the outer edges 62a and 72a. Molding surface 1a of attachment surface
, 6a part or fixed side and movable side slide member 2
．． 7 is provided with a stepped portion (not shown) corresponding to the molding of the stepped portion 62a and T2a), and when molding the frame 81 by joining the stepped portions 62a and 72a, both lenses 62 and 72 are exposed to light. This shows a case in which it is possible to eliminate variations in misalignment when abutting and setting the shafts while aligning them.

(Second Embodiment) FIG. 13 is a plan view of the main parts of a mold showing a second embodiment of the present invention.

In the case of this embodiment, a configuration is shown in which a plurality of integrally molded products of the first embodiment described above can be molded at the same time, and the first lens and the second lens are molded in the injection mold 30. There are two cavities l and 6 for each cavity, and one spool 23 for each cavity 1 and 6, and each runner 27a, 27b, 27c, 2.
7d are arranged in series, and each gate is provided in each cavity 1 and 6 on the fixed side and sliding member which are the constituent elements of each cavity 1 and 6, and furthermore, the spool 16 for the frame molding cavity is communicated with both cavities 1. The structure is as follows.

According to an embodiment with such a configuration, the molding cavities for the same lens are arranged adjacently between the frame molding spools 16 in the length direction, so that the injection molding mold can be used when manufacturing a plurality of integrally molded products. Due to the structure of the mold, only one spool is required for lens molding and one for frame molding, and the runner can be handled in a cylindrical manner.

It should be noted that other specific configurations may be implemented in accordance with the configuration of the first embodiment, and explanations thereof will be omitted.

(Third Embodiment) FIG. 14 is a plan view of the main parts of a mold showing a third embodiment of the present invention.

The mold of this embodiment shows the case where a plurality of integrally molded products are manufactured, and in particular, the molding spool 24 of the first and second lenses
．． 25 separately, and a frame forming spool 16.
is composed of one.

Therefore, in the case of this embodiment, the first lens and the second lens are applied to molding when the molding conditions are significantly different or when the molding materials are different.

Incidentally, for the same purpose, in the case of the first embodiment, an embodiment can be given in which the spools of the first lens 70 and the second lens 60 are configured separately.

(Fourth Embodiment) FIGS. 15 to 17 are explanatory diagrams showing a fourth embodiment of the present invention.

In the case of this embodiment, the frame forming in the first embodiment is performed while using the spool 23 used for forming the first and second lenses 60, 70, so that the frame forming spool 16 and the runner 17, This shows a configuration in which the configuration of the gate 18 is not required.

That is, as shown in FIG. 15, after molding the first and second lenses 60 and 70 in the same manner as in the first embodiment, the first
As shown in Figure 6, the mold is opened and the first lens 70 is placed in the fixed mold 3.
1, the second lens 60 is held in the movable mold 32, and the protruding bottle 26 is operated to form the molded product 8 of the runner 27.
Remove 0.

Thereafter, the movable mold 32 is rotated by the movable platen, and the fixed and movable slide members 2.7 are moved to form the frame molding cavity 20 through the operation of the actuator 3.8 (after setting, the 17th As shown in the figure, the spool 23
The first and second lenses 60 are filled with frame molding resin.
．． A frame 81 is integrally molded around the outer periphery of the lens 70, and the molding of the lens and frame as an integral product is completed.

The other configurations and methods are the same as those in the first embodiment, so their explanations will be omitted.

In the case of this embodiment, especially when the lens and frame are molded from the same material, the spools for lens molding and frame molding can be constructed from the same spool, which can simplify the mold configuration of the first embodiment. has advantages.

In addition, in the above explanation, we have only explained an integral molded product of a lens system in which multiple lenses are integrated into a frame, but it is also possible to use an integral molded product in which an optical system incorporating optical elements other than lenses is integrated with a frame. It can also be applied to the molding of products.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, an integrally molded product in which an optical element such as a lens is held by a frame can be molded in a series of molding steps in an injection mold, and an optical element such as a lens can be molded in a series of molding steps in an injection mold. It is possible to provide an integrally molded product with excellent durability and no variation in optical axis accuracy between elements.

[Brief explanation of drawings]

Figures 1 to 12 show a first embodiment of the present invention, Figure 1 is a sectional view of an injection mold, Figures 2 to 6 are explanatory diagrams of the molding process, and Figures 7 and 8. 9 is a sectional view showing a modified example of the integrally molded portion of the first lens and the second lens and the frame, FIG.
Figure 0 shows the first and -f! , FIG. 9 is a perspective view of the second lens, FIG. 10 is a sectional view of the movable slide member, and FIG. 11 is a diagram of FIGS. 7 and 8. 12 is a plan view showing essential parts of the injection mold shown in FIG. 1; FIGS. 13 and 14 show second and third embodiments of the present invention. A plan view of the main parts of an injection mold showing an example,
FIGS. 15 to 17 are explanatory diagrams of a molding process showing a fourth embodiment of the present invention. 1... First lens molding cavity 2... Fixed side slide member 3.8... Movable side template 4... Movable side template 5.10... Gate 6... Second Lens molding cavity 7...Movable side slide member 9...Fixed side slide member 11.13...First and second lens molding personnel 12
...Protruding plate 14...Movable side receiving plate 15...Spring 16.23...Spool 17.27...Runner 18...Gate 19.26...Protruding pin 0...Frame Molding cavity...Fixed side mounting plate 2...Movable side mounting plate 4.25...Spool 8...Protruding rond 0...Injection mold 1...Fixed mold 2... Movable mold 3.34...first and second lens molding insert 5.3
6... Bolt 7.41... Fitting part 8.39.40... Bolt 2... Spacer block 0... Second lens 0... First lens... Frame

Claims (6)

[Claims] (1) A step of molding optical elements such as a plurality of lenses with an injection mold consisting of a fixed mold and a movable mold, and rotating the movable mold to form an optical system among the optical elements such as the plurality of lenses. a step of aligning the optical axes of the optical elements to each other and abutting each optical element at the abutment surface, and forming a frame molding cavity on the outer periphery of each optical element, and forming a frame molding cavity through the cavity. A method for integrally molding an optical system such as a lens and a frame, the method comprising the step of integrally molding a frame with each optical element constituting the optical system. (2) In an injection mold consisting of a fixed mold and a movable mold, one of the two molds is rotatably held, and both molds are provided with molding cavities for a plurality of optical elements such as lenses, and The outer periphery of the molding cavity of each optical element is formed to be slidable, and a molding resin is placed in the frame molding cavity of the optical element formed by sliding the molding cavity of each optical element and the outer periphery. 1. An injection mold for integrally molding an optical system such as a lens and a frame, the mold comprising: at least one spool for filling the spool; and a runner and a gate for each of the cavities connected to the spool. (3) Of the spools, a molding spool for each of the optical elements is disposed in the center of both the molds, and a molding cavity for the first lens among the plurality of optical elements is formed as a part of the molds. a second lens molding cavity disposed on the surface and adjacent to one side with respect to a straight line passing through the molding spool of each of the optical elements, and further located at a symmetrical position with the molding cavity of each of the optical elements; 3. The injection mold for integrally molding an optical system such as a lens and a frame according to claim 2, further comprising a frame molding spool for said frame molding cavity. (4) An optical system such as a lens according to claim 2, characterized in that among the spools, a spool for molding each of the optical elements is individually arranged, and a spool for frame molding is also arranged. Injection mold for integral molding of frame and frame. (5) In an integrally molded product in which a plurality of optical elements such as lenses are molded using an injection mold and are integrally molded with a frame, the joint surface of each optical element and the frame has an inner diameter in the optical axis direction. An integrally molded product comprising an optical system such as a lens and a frame, characterized in that it is configured to be undercut against the frame. (6) In an integrally molded product in which a plurality of optical elements such as lenses are molded in an injection mold and these are integrally molded with a frame, the joint surface of the optical element and the frame is perpendicular to the optical axis. 1. An integrally molded product of an optical system such as a lens and a frame, characterized in that the cross-sectional shape is formed into an uneven shape to increase the contact area between each of the optical elements and the frame.