CN100519133C - Optical component molding apparatus - Google Patents
Optical component molding apparatus Download PDFInfo
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- CN100519133C CN100519133C CNB2005101192457A CN200510119245A CN100519133C CN 100519133 C CN100519133 C CN 100519133C CN B2005101192457 A CNB2005101192457 A CN B2005101192457A CN 200510119245 A CN200510119245 A CN 200510119245A CN 100519133 C CN100519133 C CN 100519133C
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Abstract
An apparatus for molding optical components of a small size and high precision is provided with good transferability and a reduced production cycle. This apparatus includes a plurality of runners arranged in a pattern allowing multi-cavity molding for molding plastic lenses each having an outer diameter of 2 mm to 12 mm and surface roughness Ra of 20 nm or less. The projected area of the entire runner is determined within a range of 1 cm<SUP>2 </SUP>to 12 cm<SUP>2</SUP>. The runners are arranged to extend around a sprue in directions perpendicular to an outer surface of the base molds. The pattern of the runners extending from the junction with the sprue to each shape transfer section is configured in two intersecting directions. A cavity is of a rectangular outer shape when seen from a pressure contact surface side.
Description
The cross reference of relevant patent
The application based on 2004-316623 number and the priority separately of 2004-316727 Japanese patent application the proposing together on October 29th, 2004 that require formerly, the whole content of patent is included in this by reference separately.
Technical field
The optical component molding apparatus of optical element the present invention relates to be used to be shaped, particularly, relate to the optical component molding apparatus that shaping has each optical element of small size (outer dia is that 2mm is to 12mm) and high accuracy (surface roughness Ra is 20nm or littler).
Background technology
Recently adopt the thermoplastic resin with the mode of injection molding be shaped (for example, with reference to patent document 1 and 2) such as the optical element of object lens.Because by using the plastics forming optical element, can produce the product of same structure very rapidly, therefore very suitable batch production of this shaping.The optical instrument that uses plastic lens is year by year to miniaturization and more high performance trend development.Follow this trend, plastic lens miniaturization and have more high performance requirement and increase day by day more.
(patent document 1) discloses but unexamined Japanese patent application for the 11st (1999)-No. 42685
(patent document 2) discloses but unexamined Japanese patent application for 2001-272501 number
In addition, as being used for the technology that optical element is produced in batches, developed usually said being used in the be shaped multi-cavity forming technique of a plurality of moulded products (molded articles) of matched moulds and resin injection operation.The mould that is used for the multi-cavity shaping has a sprue that is positioned at the fixed mould center and is arranged in sprue a plurality of runners on every side.That is, the lens transmitting portions is arranged in around the sprue symmetrically.In this multi-cavity forming technique, the quantity that how to increase moulded product when reducing each transmitting portions transmission changes of properties has tremendous influence to commercial profit.
Yet top a plurality of the following aspects that are formed in small size and high-precision optical element have problems.The good transmission performance of such small size and high-precision optical element requirement is shaped.For reaching this purpose, the runner in the multi-cavity forming machine has big thickness (diameter).Yet at so large diameter runner that has, cured resin needs for a long time in each runner.In other words, cool time (duration) determines to depend on the needed time of the resin that solidifies in each runner.So just be difficult to shorten the production cycle.
Usually; in the injection molding machine; the optical characteristics of molding of optical elements is subjected to the very big influence from the Mould Machining precision probably, face displacement that can cause being caused by die deformation when mould begins that pressurized contacts or be separated from one another (in the dislocation perpendicular to the direction lens surface of lens axis) and inclination (with respect to the angled dislocation of optical axis lens surface of lens).Under the situation of producing optical element, must accurately assess the eccentricity of moulded product and the position adjustments of transferring elements.These conditions become much more difficult when the moulded product of shaping reduced size.
Summary of the invention
The present invention can overcome at least one in the problems referred to above of traditional optical element forming device, and a kind of small size and high-precision optical element and can obtain to have the device of good communication performance and the shaping optical element of shortening production cycle of being shaped is provided.
Other purpose of the present invention and advantage will partly propose and become obviously by description in the following description, also can recognize from the practice of the present invention.Objects and advantages of the present invention can realize and recognize by instrument and the combination of pointing out in the appended claims particularly thereof.
To achieve the object of the present invention, the invention provides a kind of optical component molding apparatus of producing a plurality of optical elements, it comprises: fixed mould; Can with fixed mould contact and the flexible mould that separates from fixed mould; Wherein being in the fixed mould of contact condition and flexible mould during pressurized is furnished with to have separately and determines at 1.0cm
2To 12cm
2Scope among the runner and the shape transfer section of projected area, be injected into the shaping transmitting portions to produce a plurality of optical elements by the runner resin material, it is 20nm or littler optical surface to outer dia and the surface roughness of 12mm that each optical element has 2mm, and at least four optical elements are shaped in clamping operation.
Specifically, optical component molding apparatus of the present invention is configured to each optical element that is shaped and has small size (outer dia is that 2mm is to 12mm) and high accuracy (surface roughness Ra is 20nm or littler).This is a kind of multi-cavity forming machine that is used at least four article of clamping operation shaping.For quantity that good transmission performance is formed product preferably 16 or still less is provided.In optical component molding apparatus of the present invention, the projected area of each runner of mould of the top optical element that is used for being shaped is defined at 1.0cm
2To 12cm
2Scope among.Determine that the diameter of runner and length are to obtain projected area.If the projected area of each runner is 12cm
2Or littler, in each runner, be used to cool off with the required time of cured resin and become shorter.If projected area is 1.0cm
2Or bigger, can guarantee good transmission performance.Therefore, projected area must be defined in the above-mentioned scope to obtain good transmission performance and to shorten the production cycle.In addition, because each runner has little volume, can reduce the material cost of consumable material.
Description of drawings
Being included in this accompanying drawing that also constitutes this specification part shows embodiments of the invention and is used for explaining purpose of the present invention with specification, advantage and principle.
In the drawings,
Fig. 1 is the view that goes out plastic lens forming machine (mould is in released state) structure in the preferred embodiment schematically illustrated;
Fig. 2 is the view of schematically illustrated plastic lens forming machine (mould is in contact condition under pressure) structure;
Fig. 3 is the schematically illustrated cross sectional side view that is used for the mould structure of plastic lens;
Fig. 4 is the view that the pressure contact surface of the mould that is used for plastic lens among first embodiment is shown;
Fig. 5 illustrates the cool time of runner and the curve map of the relation between the runner projected area;
Fig. 6 is the profile of an example (shaping of 4 chambeies) of runner figure in the mould among first embodiment;
Fig. 7 A is the profile of another example (shaping of 8 chambeies) of runner figure in the mould of first embodiment;
Fig. 7 B is the profile of another example (shaping of 8 chambeies) of runner figure in the mould of first embodiment;
Fig. 8 A is the profile of another example (shaping of 16 chambeies) of runner figure in the mould of first embodiment;
Fig. 8 B is the profile of another example (shaping of 16 chambeies) of runner figure in the mould of first embodiment;
Fig. 9 is that the resin that runner among first embodiment is shown is accepted explanatory partly;
Figure 10 is the view of the position adjusting mechanism (before regulating) of die cavity among schematically illustrated first embodiment;
Figure 11 is the view of the position adjusting mechanism (after regulating) of die cavity among schematically illustrated first embodiment;
Figure 12 is the view that the pressure contact surface of the mould that is used for plastic lens in second preferred embodiment is shown;
Figure 13 is the profile of an example (shaping of 4 chambeies) of runner figure in the mould among second embodiment;
Figure 14 A is the profile of another example (shaping of 8 chambeies) of runner figure in the mould of second embodiment;
Figure 14 B is the profile of another example (shaping of 8 chambeies) of runner figure in the mould of second embodiment;
Figure 15 A is the profile of another example (shaping of 16 chambeies) of runner figure in the mould of second embodiment;
Figure 15 B is the profile of another example (shaping of 16 chambeies) of runner figure in the mould of second embodiment;
Figure 16 A is the profile of an example (bending) of runner figure in the mould of second embodiment;
Figure 16 B is the profile of another example (bending) of runner figure in the mould of second embodiment;
Figure 16 C is the profile of another example (bending) of runner figure in the mould of second embodiment;
Figure 17 is that the resin that runner among second embodiment is shown is accepted explanatory partly;
Figure 18 is the view (part 1) of the position adjusting mechanism of die cavity among schematically illustrated second embodiment;
Figure 19 is the view (part 2) of the position adjusting mechanism of die cavity among schematically illustrated second embodiment;
Figure 20 is the view (part 3) of the position adjusting mechanism of die cavity among schematically illustrated second embodiment;
Figure 21 is the view of the transmission performance of explanation diffraction lens, and poor transmission performance is shown;
Figure 22 is the view of the transmission performance of explanation diffraction lens, the transmission performance that illustrates; And
Figure 23 is the cutaway view that the mould total is shown.
The specific embodiment
Referring now to accompanying drawing detailed description is made in preferred embodiment of the present invention.In the present embodiment, the present invention is applied on the forming machine of plastic lens.The product that is shaped (article) is an outer dia at 2mm between the 12mm and have a plastic lens that surface roughness Ra is 20nm or littler optical surface.Plastic lens comprises lens component and is formed on lens component flange portion on every side.Flange portion is the part that is supported by lens holder or analog.This type of plastic lens can be applicable in the optical pickup optical system of optical television camera tube device, have in the cellular imaging optical system of built-in camera and some other products.For the optical pickup optical system, particularly, having 2mm separately needs high accuracy and large batch of production to the optical lens of 7mm external diameter.Therefore, the present invention's this type of plastic lens that is suitable for being shaped.
[first embodiment]
Fig. 1 and Fig. 2 schematically show the structure of the forming machine 100 in the present embodiment.Specifically be that Fig. 1 shows the separated position of mould; Fig. 2 shows the pressure contact condition of mould.Fig. 3 and Fig. 4, Figure 22 schematically show the structure of mould.Particularly, Fig. 3 and Figure 23 show the cross sectional side view of die pressure contact condition and the pressure contact surface that Fig. 4 shows fixing mould.It should be noted that Fig. 3 is the enlarged drawing of the represented part of Figure 23 dotted line.
More particularly, as shown in Fig. 1 and Fig. 2, plastic lens forming machine 100 in the present embodiment comprise the fixed form 10 that disposes fixed mould 1 with dispose can with the collapsible form 20 of fixed mould 1 flexible mould 2 that separate and that under pressure, contact with fixed mould 1.Forming machine 100 in the present embodiment is to produce the small shaping machine that is about 15 tons of (150kN) mold clamping forces.
Fixed form 10 is provided with inlet, and the resin that melts by inlet is injected into mould 1 from injection member 80.Injection member 80 can be preplasticizing type or screw type in upright arrangement.
The formation of forming machine 100 as shown in Figure 3.Die cavity 11 inserts in the basic mode 13 of fixed mould 1, and core 12 inserts die cavity 11.Similarly, die cavity 21 inserts in the basic mode 23 of flexible mould 2, and core 22 inserts in the die cavity 21.That is, die cavity and core have constituted the insert in the basic mode.In this manual, the parts of composition of transmitting portions that are used to form the lens component of plastic lens are called as " core ", are used to form the parts that the transmitting portions that is arranged in the flange portion around the lens forms and are called as " die cavity ".In addition, the mould of support transmitting portions (core and die cavity) is become " basic mode ".
Look from pressure contact-making surface (PL surface) side, the outer shape of basic mode 13 is a rectangle.In addition, as shown in Figure 4, look from pressure contact-making surface one side, the outer shape of die cavity 11 also is a rectangle.It is parallel that die cavity is arranged to the outer surface of each outer surface of die cavity 11 basic mode 13 corresponding with each.Look from pressure contact-making surface one side, the outer shape of core 12 is circular.Flexible mould 2 is structurally identical with basic mode 13.
Specifically be that basic mode 13 is provided with cavity (recess) to accept die cavity 11.The width of this cavity is more bigger than the width of die cavity 11.The gap that die cavity 11 produces between die cavity 11 and basic mode 13 when inserting basic mode 13 is filled by cushion block.The position in cushion block adjustable type chamber 11 reaches fixedly die cavity 11.The adjusting of die cavity 11 positions will be described in more detail below.
When flexible mould 2 contacts with fixed mould 1 pressure, in the mould 1 and 2 of combination, produce hole (seeing Fig. 3 and 23).This hole provides shape transfer section 50, cast gate 51, and runner 52 and sprue 53 form flow channel, and the resin of fusing flows into runner 52 by flow channel from inlet.
The surface of the transmitting portions of transferring elements (core and die cavity) preferably adopts metal to electroplate.Electrodeposition of metals has predetermined thickness, and its thickness range is from 10 microns to 100 microns.For on the transmission surface, providing OPD to keep structure (for example diffraction lens), preferably to electrodeposited coating machined (cutting).Separating property and protection mould for improving mould can use chromium nitride, titanium nitride, and diamond-like-carbon (DLC) or the like carries out surface treatment.This can improve in shaping and the mobile performance of resin in mould during transmitting, and improves the disengaging performance (separating property of mould) of moulded product from mould.
In this manual, " OPD maintenance structure " means the structure that is made of the annular region of cutting apart with small step outside central area that comprises optical axis and the central area, and it has following characteristic.Promptly, at predetermined temperature, between adjacent annular region, the OPD of a plurality of wavelength of the accumulation of meeting generation incident beam, with when temperature during from predetermined variations in temperature, follow the variation of refraction coefficient, the OPD that produces between the adjacent annular zone is from a plurality of accumulation wavelength shifts of incident beam.The detailed structure of " OPD maintenance structure " is following described structure.That is, for example, the annular region outside the abuts against central zone of formation places the direction of optical axis so that the relative central area of optical path length to be extended; The annular region that forms within the maximum effective diameter position be placed in the direction of optical axis so that optical path length relatively the annular region outside this annular region be extended; And the annular region that forms within 75% position of maximum effective diameter place the direction of optical axis so that optical path length relatively within this annular region and outside annular region be shortened.
Below the process of producing plastic lens by forming machine 100 in the present embodiment is illustrated.What forming machine 100 adopted in it should be noted in the present embodiment is the multi-cavity forming machine that can produce a plurality of plastic lens simultaneously, but will only be described a plastic lens that will be shaped for convenience of explanation.Be in contact with each other together state of two mould pressurizeds at this forming machine 100, by sprue, runner 52 and cast gate 51 are injected into shape transfer section 50 to the resin of fusing successively.After cooling off then and solidify around the shape transfer section 50, flexible mould 2 leaves from fixed mould 1 punishment in the resin distribution of injecting mould.Injected device of moulded product or analog penetrate.The moulded product that penetrates is by the plastic lens body, be arranged on the periphery of plastic lens body optical surface flange portion, with sprue 53, runner 52 and cast gate 51 corresponding other parts are whole constitutes.Cut in cutting process subsequently with cast gate 51 corresponding parts.Produced plastic lens like this.
About the molding condition of plastic lens, for example, adopting under the situation of unbodied polyene hydrogen resin as molten resin, the temperature of mould is 120 ℃; The temperature of resin is 280 ℃; Injection speed is 50mm/ second; Dwell pressure is 100Mpa.Unbodied polyene hydrogen resin can comprise
Brand article (Zeon company) and
Brand article (Mitsui chemical industry).
About being used for the plastic resin of forming machine 100 in the present embodiment, can adopt the transparent resin material that is generally used for optical material.For example, preferably use at 2004-144951 number, 2004-144953 number, the appropriate resin that proposes in the 2004-144954 Japanese patent application.Particularly, resin can comprise acrylic resin, cyclenes resin, polycarbonate resin, polyester resin, polyethers resin, polyamide, poly-inferior acyl ammonia resin or the like.
The refractive index of resin can descend when temperature rises, and most of inorganic matter refractive index when temperature rises can increase.A kind of known technology being arranged herein, negates mutually so that refractive index avoids changing by allowing top two specific characters work.For achieving the above object, 30nm or littler inorganic matter, preferably, and 20nm or littler inorganic matter, best, the inorganic matter in 10 to 15nm scopes is scattered in the resin as base material.
The multi-cavity that to describe plastic lens below is shaped.Plastic lens forming machine 100 in the present embodiment is configured to 4 to 16 moulded products that are shaped in a matched moulds operation.In addition, in this forming machine 100, the projected area of whole runner 52 is defined as at 1.0cm
2To 12.0cm
2Between.The diameter of runner and length are determined to be implemented in the projected area in the above scope.
The applicant has found the relation between the projected area of resin cool time in the runner and runner according to test.
Fig. 5 is a curve map of showing this relation.The cool time that it should be noted product section, the thickness with moulded product (plastic lens) changed.Forming machine in the present embodiment is at the lens that are used for cellular photo-optics optical system and optical pickup optical system.The thickness of these type of lens is approximately 1mm.Therefore, product section thickness in this example is 1mm.
As shown in Figure 5, the projected area at runner is 12cm
2Or more cool time of hour runner shorter than cool time of product section.So runner cools off sooner than product section.Therefore, the cooling of the resin in runner and setting time are to not influence of production cycle.Otherwise, be to compare 12cm in the projected area of runner
2When bigger, the cool time of runner is longer than the cool time of product section.Therefore the runner cooling stand-by period need be provided, cause the longer production cycle.
The applicant has also assessed the relation between the projected area of the transmission performance of shape transfer section and runner.Table 1 shows each projected area (unit: cm of runner
2) the assessment result of the effective percentage of product.
Table 1
| Runner projected area (cm 2) | 0.1 | 0.5 | 0.7 | 0.8 | 0.9 | 1.0 | 1.1 | 1.2 | 1.3 | 1.5 | 2.0 |
| Assessment result | × | × | × | △ | △ | ○ | ○ | ○ | ○ | ○ | ○ |
As shown in table 1, be 1.0cm in the projected area of runner
2Or when bigger, effectively percentage is result's (assessment result: zero) high and that obtain.Projected area to runner is respectively 0.8cm
2Or 0.9cm
2The time, effectively percentage is low and result's (assessment result: △) of not obtaining.Projected area to runner is respectively 0.7cm
2Or more hour, effectively percentage also is low (assessment result: *) for very low and output.
When the projected area of runner 52 less than 1.0cm
2The time, it is littler that flow diameter becomes inevitably.This will cause the transmission degradation of shape transfer section 50.On the other hand, when the projected area of runner 52 greater than 12.0cm
2The time, it is bigger that flow diameter becomes inevitably.This will make that resin cooling and setting time in runner 52 are longer, cause the production cycle longer.Thereby, determine preferably that for when shortening the production cycle, obtaining to transmit performance the projected area of runner 52 is at 1.0cm
2To 12cm
2Scope between.
Mold center in the present embodiment comprises a sprue.Be furnished with a plurality of along parallel/runner 52 of extending perpendicular to the direction of basic mode outer surface around sprue.Each runner 52 diverges once between sprue and shape transfer section 50, and twice, perhaps three times.Runner 52 forms at each bifurcation point and resembles the shape of tee to distribute the resin of fusing equably at bifurcation point.Particularly, runner 52 is configured to two square crossing directions.Each runner extends to each shape transfer section 50 with length much at one from the joint with sprue.
The figure that is used for the runner 52 of multi-cavity shaping below will be respectively with reference to Fig. 6 (4-chamber), and Fig. 7 A and Fig. 7 B (8-chamber) reach Fig. 8 A and Fig. 8 B (16-chamber) and illustrate.These figures only as an example, and the structure of core and die cavity is not limited to following figure.
For example, under the situation of as shown in Figure 6 4-cavity mould, two traffic channels (runner 52) extend from sprue 53.Each runner 52 is bifurcated into two traffic channels that extend in opposite direction from bifurcation point with the right angle, resembles tee.The end of each fork passage is formed with shape transfer section 50.In other words, when diverging once, each runner 52 has arrived shape transfer section 50.
Under the situation of the 8-cavity mould shown in Fig. 7 A, two traffic channels (runner 52) extend from sprue 53.Each runner 52 is bifurcated into two traffic channels that extend in opposite direction from bifurcation point with the right angle, and each fork traffic channel further is bifurcated into two traffic channels that extend in opposite direction from bifurcation point with the right angle.The end of each fork passage is formed with shape transfer section 50.In other words, when fork twice, each runner 52 has arrived shape transfer section 50.In addition, under the situation of the 8-cavity mould shown in Fig. 7 B, four traffic channels (runner 52) extend from sprue 53.Each runner 52 is bifurcated into two traffic channels that extend in opposite direction from bifurcation point with the right angle.The end of each fork passage forms shape transfer section 50.In other words, when diverging once, each runner 52 arrives shape transfer section 50.
Under the situation of the 16-cavity mould shown in Fig. 8 A, two traffic channels (runner 52) extend from sprue 53.Each runner 52 is with right angle fork three times and arrive shape transfer section 50.Under the situation of the 16-cavity mould shown in Fig. 8 B, four traffic channels (runner 52) extend from sprue 53.Each runner 52 is with twice of right angle fork and arrive shape transfer section 50.
In every kind of figure, and the length of the joint of sprue 53 and each runner 52 between each corresponding shape transfer section 50 much at one.Best is fork runner 52 once, twice, or three times, be provided with at each bifurcation point and accept part.This is based on following reason.Particularly, the temperature of the molten resin of inflow runner 52 is very high, reaches 200 ℃ to 300 ℃.On the other hand, the temperature of mould is low to 70 ℃ to 150 ℃.So, may reduce in the temperature of the molten resin of fluid front end.Show very significantly at flow diameter than a hour temperature reduction.As shown in Figure 9,, and be provided with resin at bifurcation point and accept part 54, thereby the resin that temperature has reduced is allowed to stay accepts part 54 when some intermediate points fork of runner 52 at runner.This makes the resin that flows into shape transfer section 50 when being retained in high temperature become possibility.Transmitting performance therefore can improve.Resin is accepted part 54 can replace that bifurcation point is located at any position in the runner 52.For example, under the situation of its some intermediate point bending, can resin be set at runner 52 and accept part at sweep.
When the quantity of fork or crooked each runner 52 is four or more, the resistance in the flow channel can increase.When resistance increases, begin to become big, the pressurize that this will hinder shape transfer section 50, the reduction that causes transmitting performance at the fork or the pressure loss of sweep.For avoiding this type of defective, the best fork or the quantity of runner bending are 3 or still less.
The example of the position adjustments of die cavity 11 will be described below.As shown in figure 10, in mould, the gap between die cavity and the basic mode is filled by cushion block 14 and 24.Figure 10 shows fixed mould 1 and flexible mould 2, comprises that the optical axis of lens component misplaces separately.In the mould shown in Figure 10, the width of the die cavity 11 in the fixed mould 1 is than the wide amount that goes out corresponding to Figure 10 cross hatch zone of the width of the die cavity in the flexible mould 2 21.Therefore, on optical axis separately, produced skew.Because this reason, the part of the die cavity 11 in the fixed mould is cut by cutting process or similar method with the quantity (being the cross hatch part among Figure 10) corresponding to skew.Then, new cushion block 15 is inserted in the interval that produces after the cutting that goes out as shown in Figure 11 and is offset with compensated position.
In the mould in the present embodiment, the graphic designs of runner 52 is for using two square crossing directions and having arranged that the die cavity 11 of rectangular shape is so that the outer surface of runner 52 is parallel to the outer surface of basic mode 13.In view of the above, the level of basic mode 13 and vertical direction can be mated the direction that is used for a bias adjustment.The assessment of the degree of eccentricity (optical axis of lens component and the axial deviation between the flexible mould in the fixed mould 1) that each of moulded product is surperficial is only made in the measurement with respect to two intersecting axles.Therefore, may determine the locality of regulated quantity (distance) and die cavity 11 at an easy rate.
In the forming machine 100 in first embodiment described above, the projected area of runner 52 is defined as at 1.0cm
2To 12cm
2Scope between and the graphic designs of runner 52 for allowing be shaped four or more moulded product.In addition, determine that the diameter of runner and length are to be implemented in the projected area in the above-mentioned scope.This makes that the diameter of runner 52 is littler shorter with cool time runner 52.Equally, the length of runner 52 has shortened, and this provides good transmission performance to shape transfer section 50.Thereby the optical component molding apparatus of be used to be shaped a plurality of small sizes and high-precision optical element can obtain good transmission performance and shorten the production cycle.
The figure of runner 52 is configured in two square crossing directions.In addition, are rectangles from the look outer shape of die cavity 11 of pressure contact surface one side, the outer shape of die cavity 11 is arranged to so that its outer surface is parallel to the outer surface of basic mode 13.Therefore, the level of basic mode 13 and vertical direction can be mated with the adjusting direction of axle offset.Assessment to the degree of eccentricity of moulded product is only required with respect to two intersecting axles.The position adjustments of transferring elements is only required relative two intersecting axles.Thereby, the position that is easy to assess the degree of eccentricity of moulded product and regulates transferring elements.
Forming machine 100 is the so-called small shaping machines that can produce 15 tons (150kN) or littler mold clamping force.Because the area of runner such as 1.0cm
2To 12cm
2Equally little.To be 15 tons be enough to maximum clamping force thus.Such forming machine 100 can reach the purpose of saving space and energy savings.
In addition, in forming machine 100, each runner 52 is bent between sprue 53 and cast gate 51 1 to 3 time.Be provided with resin at each sweep and accept part 54.In other words, the front end (low temperature part) that provides resin to accept the resin of part 54 feasible permission fusings rests on the resin receiving portion and is divided into possibility.Thereby flow into the resin of shape transfer section in the time of might keeping high temperature and good transmission performance is provided.
[second embodiment]
As the forming machine among first embodiment, the forming machine in second embodiment comprises fixed form that is provided with fixed mould and the collapsible form that is provided with flexible mould.Forming machine in the present embodiment is the small shaping machine that can produce the mold clamping force of 15 tons of (150kN) grades.This forming machine is arranged to four to 16 products that are shaped in a matched moulds operation.
As first embodiment, each mould comprises basic mode, die cavity and core.These die cavities and core are configured to the insert (see figure 3) in basic mode.In addition, as among first embodiment in the same way, the projected area of whole runner is determined to be in 1.0cm
2To 12cm
2Scope between.Determine that the diameter of runner and length are to realize the projected area of above-mentioned scope.
Forming machine in the present embodiment is different with the forming machine among first embodiment on cavity shape.Particularly, when when pressure contact surface one side is seen, the outer shape of each die cavity 11 and core 12 is circular as shown in figure 12.
Specifically, basic mode 13 is provided with cavity (recess) to accept die cavity 11.This die cavity 11 is provided with cavity (recess) to accept core 12.Therefore, die cavity 11 be assemblied in the recess of basic mode 13 and, in addition, core 12 is contained in the recess of die cavity 11.Looking from pressure contact surface is that circular each die cavity 11 and core 12 is arranged to rotatable.The position of core 12 is regulated in this rotation.The adjusting of core 12 positions will be described in more detail below.
The runner figure of the forming machine in the present embodiment is different with the forming machine among first embodiment.Each mold arrangement becomes a plurality of runners 52 radially to extend around sprue 53.Each runner 52 that extends to shape transfer section 50 from the joint with sprue 53 has length much at one.Each runner 52 can and the joint of sprue and each shape transfer section 50 between fork or crooked one to three time.
In Figure 13 (4 chamber), the figure of the runner 52 that is used for the multi-cavity shaping has been shown among Figure 14 A and 14B (8-chamber) and Figure 15 A and the 15B (16-chamber).In addition, Figure 16 A, 16B and 16C show the example of the curved patterns of runner 52.These figures that are to be understood that are example only, and the structure of core and die cavity is not limited thereto.
For example, under the situation of 4-cavity mould example shown in Figure 13, formed 4 traffic channels (runner 52) and extended from sprue 53.Particularly, runner 52 is arranged to radially extend from sprue 53.End at each runner 52 is provided with shape transfer section 50.
Under the situation of the 8-cavity mould example shown in Figure 14 A, formed 8 traffic channels (runner 52) and extended from sprue 53.In addition, under the situation of another 8-cavity mould example shown in Figure 14 B, formed 4 traffic channels (runner 52) and extended from sprue 53.Each runner 52 be bifurcated into two the fork passages and each the fork passage end be provided with shape transfer section 50.In other words, when diverging once, runner 52 arrives corresponding shape transfer section 50.
Under the situation of the 16-cavity mould example shown in Figure 15 A, formed 16 traffic channels (runner 52) and radially extended from sprue 53.Under the situation of another 16-cavity mould example shown in Figure 15 B, formed 8 traffic channels (runner 52) and extended from sprue 53, in addition, each runner 52 fork is once to arrive shape transfer section 50 separately.
As Figure 16 A, shown in 16B and the 16C, runner 52 can be arranged to curved patterns so that each runner 52 with right-angle bending.The end of the sweep of each runner 52 is provided with resin and accepts part.The temperature of molten resin that will flow into each runner 52 is very high, reach 200 ℃ to 300 ℃.On the other hand, the temperature of mould is low to 75 ℃ to 150 ℃.Therefore, the temperature at the molten resin of fluid front end reduces probably.Show very significantly at flow diameter than a hour temperature reduction.As shown in figure 17, when runner 52 some intermediate point bending at runner, and be provided with resin at the end of sweep and accept part 54, this resin that makes temperature reduce is allowed to be retained in accepts part 54.This makes the resin that flows into shape transfer section 50 when being retained in high temperature become possibility.Transmitting performance therefore can improve.Resin is accepted part 54 can replace that branched portion sets up separately in any position in the runner 52.For example, under the situation of some intermediate point fork, can resin be set at runner and accept part at bifurcation point.
An example of die cavity 12 position adjustments will be described below.As shown in figure 18, in the mould of present embodiment, cylindrical (section is for circular) die cavity 11 is inserted into basic mode 13.In this die cavity 11, insert eccentric cylindrical bush 14.In addition, columniform core 12 inserts eccentric bush 14.Eccentric bush 14 is within a predetermined distance with respect to core 12 and die cavity 11 off-centre.Figure 18 shows the state that the center of the center of core 12 and die cavity 11 coincides.
In the mould in the present embodiment, the position of core 12 can be changed by the rotation of eccentric bush 14.Figure 19 shows eccentric bush 14 turns over 180 ° from state shown in Figure 180 state.Particularly, along with 180 ° of rotations of eccentric bush 14, the center of core 12 is removed from the center of die cavity 11.In the mould of present embodiment, the position of core 12 can be changed by the rotation of die cavity 11.Figure 20 shows die cavity 11 turns over 90 ° from state shown in Figure 19 state.More specifically, the center of core 12 also can be moved by the rotation of die cavity 11.By the simple rotation of die cavity 11 and eccentric bush 14, skew that can compensated position.
Be inserted into the mould that includes with the runner 52 that radially extends pattern arrangement if having the transferring elements of the rectangular profile shown in first embodiment, can form unwanted interval, cause large-sized basic mode.This also can cause the increase of flow channel length.Thereby, under runner 52 is configured to the situation of radially extending figure shown in present embodiment, insert preferably that having looks from pressure contact surface is the transferring elements of circular profile.
In the die forming machine as top detailed description second embodiment, the projected area of runner 52 is defined as at 1.0cm
2To 12cm
2Scope between and the figure of runner 52 be designed to allow be shaped four or more moulded product.In addition, determine that the diameter of runner and length are to be implemented in the projected area in the above-mentioned scope.This makes that the diameter of runner 52 is littler shorter with cool time runner 52.Equally, the length of runner 52 has shortened, and this provides good transmission performance to shape transfer section 50.Thereby the optical component molding apparatus of be used to be shaped a plurality of small sizes and high-precision optical element can obtain good transmission performance and shorten the production cycle.
The figure of runner 52 is configured to radially extend runner 52 from sprue 53.In addition, die cavity 11 has when looking from pressure contact surface and is circular external shape.Therefore die cavity 11 can access processing simultaneously and circumferentially processing, thereby machining accuracy such as the roughness and the axiality of raising are provided.Die cavity 11 with circular profile might while and the outer periphery of circumferential processing cavity 11 and the same interior periphery that is used for core 12 insertions.Under the transmission surface of lens flange part will form in situation in the die cavity 11, can be with the circumferential inside and outside periphery of processing cavity 11 of transfer surface.In view of the above, can be with made with high precision die cavity 11.Comprise for example turning with circumferentially handling in the time of such.On the other hand, for die cavity 11, can not obtain the so coaxial and processing while with rectangular profile.Thereby need replace parts for each processing.In addition, several microns are very difficult to the processing of sub-micron.
When die cavity 11 was circular profile, it can access high-precision eccentric processing.Therefore, can make transferring elements eccentric in advance.By the rotation of this transferring elements, can realize the high precision position adjusting.In addition, because die cavity 11 can be processed simultaneously, it is effective especially to the lens that shaping has fine structure (for example, OPD keeps structure) optical surface.
In the middle of first and second embodiment under the situation that a plurality of little optical elements will be formed, the projected area of each runner 52 constitute must projected area great majority.The projected area of determining each runner 52 within above-mentioned scope reducing total projected area, thereby reduce the mold clamping force that is shaped and needs.Thereby can realize reducing of forming machine.Can also improve energy conservation and space saves.Can reduce the volume of the resin that needs in each runner in addition, thereby reduce the cost of consumable material.
Have in shaping under the situation of lens of OPD structure optical surface,, transmit performance output is had tremendous influence such as diffraction lens.In other words, if it is low to transmit performance, as shown in figure 21, resin can not be filled into fully and be formed on each end that transmits the groove in the surface.This can damage the optical characteristics of moulded lens.Has good transmission performance as the forming machine 100 that constitutes among the top embodiment.Therefore, as shown in figure 22, resin can be filled into fully and be formed on each end that transmits the groove in the surface.It is effective especially to the optical element that has the OPD structure on the shape transfer surface.
Should be understood that the foregoing description is not limited to this as just example and this aspect.The present invention can embody with other concrete form under the situation that does not deviate from substantive characteristics of the present invention.For example, injection member is not limited to pre-plastotype and screw type in upright arrangement, can be I-shaped plunger piston type for example.
In the forming machine 100 of present embodiment, the mould of shaping plastic lens is purchased with the core and the die cavity that separate, but is not limited to this.That is, mould can core and the integrated combination of die cavity dispose (transmitting portions of lens component and the transmitting portions of flange portion provide with integrated).
As for as the optical element of wanting formed product,, mixed method is not particularly limited when the plastic resin as base material mixes mutually with particulate.Can use any following method.That is, plastic resin and particulate are prepared the method for again the two being mixed mutually separately; The method that under the condition that comprises the particulate that has prepared, prepares plastic resin; At the plastic resin for preparing is the method for preparing particulate under the condition that exists; Prepare method of plastic resin and particulate or the like simultaneously.Particularly a kind of suitable method, for example, a kind of solution and microparticulate that plastic resin is dissolved in are wherein disperseed equably and are mixed equably in wherein another kind of solution; Thereby by mixed dissolution degree very poor plastic resin and solution, with the material of the composition that obtained expectation.Yet the method for mixing is not limited to the above.
In addition, be not specially limited the mixability between the plastic resin and particulate in the optical element.But, preferably mix the two equably.Under the inadequate situation of mixed-level, optical property is refractive index particularly, and the transmission of Abbe number and light all can be affected.Moreover, the processing characteristics of resin such as thermoplasticity, fusing plasticity and similar performance can be affected.Because mixability can be subjected to preparation method's influence, when considering the performance of plastic resin and particulate, should select suitable method.Be mixed plastic resin and particulate equably, can suitably use directly the method that plastic resin and particulate are combined.
Apparent from above-mentioned explanation, can provide the production small size of a kind of production cycle with good communication performance and shortening and the optical component molding apparatus of high-precision optical element according to the present invention.
Claims (9)
1. optical component molding apparatus of producing a plurality of optical elements, it comprises:
Fixed mould; With
Can contact and the flexible mould that separates from fixed mould with fixed mould;
Wherein being in the fixed mould of contact condition and flexible mould during pressurized is furnished with projected area and determines at 1cm
2To 12cm
2Scope among runner and shape transfer section, resin material is injected into the shaping transmitting portions producing a plurality of optical elements by runner, each optical element have 2mm to the outer dia of 12mm and surface roughness be 20nm or littler optical surface and
At least four optical elements are shaped in clamping operation.
2. 1 optical component molding apparatus as claimed in claim is characterized in that:
Runner is to be configured to the pattern arrangement of two square crossing directions.
3. 2 optical component molding apparatus as claimed in claim, also comprise insert in flexible mould and the fixed mould at least one and when the transferring elements that when the pressure contact surface side is seen, has the rectangular outer shape,
Wherein in transferring elements, is furnished with shape transfer section.
4. 1 optical component molding apparatus as claimed in claim is characterized in that:
The pattern arrangement of runner radially to extend from sprue.
5. optical component molding apparatus as claimed in claim 4, also comprise insert in flexible mould and the fixed mould at least one and when the transferring elements that when the pressure contact surface side is seen, has the rectangular outer shape,
Wherein in transferring elements, is furnished with shape transfer section.
6. 1 optical component molding apparatus as claimed in claim is characterized in that:
Flexible mould contacts with fixed mould when mold clamping force is 150kN or littler pressure.
7. 1 optical component molding apparatus as claimed in claim is characterized in that:
Each runner is shaped as has one to three sweep between sprue and cast gate, and resin is accepted partially-formed at each sweep.
8. 1 optical component molding apparatus as claimed in claim is characterized in that:
It is step-like that described shape transfer section becomes in the annular region of the optical axis that centers on the optical element that will be shaped.
9. 1 optical component molding apparatus as claimed in claim is characterized in that:
The optical element that is shaped has determines the outer dia in the 7mm scope at 2mm.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004316623 | 2004-10-29 | ||
| JP2004316727 | 2004-10-29 | ||
| JP2004316623 | 2004-10-29 |
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| Publication Number | Publication Date |
|---|---|
| CN1765609A CN1765609A (en) | 2006-05-03 |
| CN100519133C true CN100519133C (en) | 2009-07-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005101192457A Active CN100519133C (en) | 2004-10-29 | 2005-10-28 | Optical component molding apparatus |
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Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101664983B (en) * | 2008-09-04 | 2013-06-05 | 鸿富锦精密工业（深圳）有限公司 | Forming mold |
| CN102189639A (en) * | 2010-03-09 | 2011-09-21 | 鸿富锦精密工业（深圳）有限公司 | Multi-cavity mold |
| CN102357996A (en) * | 2011-08-04 | 2012-02-22 | 苏州腾行精密模具有限公司 | Flow channel structure used for multi-cavity |
| CN102814933A (en) * | 2012-09-03 | 2012-12-12 | 晟扬精密模具（昆山）有限公司 | Forming mould for SD (secure digital) card |
| JP6299748B2 (en) * | 2013-03-21 | 2018-03-28 | コニカミノルタ株式会社 | Optical element manufacturing method |
| CN105599249A (en) * | 2016-01-22 | 2016-05-25 | 苏州艾力光电科技有限公司 | Quick-to-cool ceramic die for producing optical lens |
| JP6637780B2 (en) * | 2016-02-12 | 2020-01-29 | 日本電産サンキョー株式会社 | Nest for lens molding die and lens molding die provided with the same |
| JP6637779B2 (en) * | 2016-02-12 | 2020-01-29 | 日本電産サンキョー株式会社 | Mold nest fixing structure and lens molding mold provided with the same |
| WO2020024121A1 (en) * | 2018-08-01 | 2020-02-06 | 深圳明智超精密科技有限公司 | New backlight source lens mold with 256 cavities in one mold |
| CN112969572A (en) * | 2018-11-02 | 2021-06-15 | ams传感器新加坡私人有限公司 | Method for manufacturing optical element module |
| CN109262981A (en) * | 2018-11-09 | 2019-01-25 | 深圳明智超精密科技有限公司 | One-mold 512-cavity optical lens mold and molding processing technology |
| CN110815731B (en) * | 2019-11-04 | 2022-01-25 | 宁波帅特龙集团有限公司 | Spectacle case production mold and production process |
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| CN1765609A (en) | 2006-05-03 |
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