WO2006049164A1 - 結像光学レンズユニット、及び光学レンズホルダー - Google Patents
結像光学レンズユニット、及び光学レンズホルダー Download PDFInfo
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- WO2006049164A1 WO2006049164A1 PCT/JP2005/020103 JP2005020103W WO2006049164A1 WO 2006049164 A1 WO2006049164 A1 WO 2006049164A1 JP 2005020103 W JP2005020103 W JP 2005020103W WO 2006049164 A1 WO2006049164 A1 WO 2006049164A1
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- Prior art keywords
- optical lens
- lens holder
- resin
- central axis
- molded
- Prior art date
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- 230000003287 optical effect Effects 0.000 title claims abstract description 321
- 229920005989 resin Polymers 0.000 claims abstract description 100
- 239000011347 resin Substances 0.000 claims abstract description 100
- 239000002134 carbon nanofiber Substances 0.000 claims abstract description 89
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 59
- 238000001746 injection moulding Methods 0.000 claims abstract description 30
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- 238000003384 imaging method Methods 0.000 claims description 58
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- 239000007924 injection Substances 0.000 claims description 35
- 229920001707 polybutylene terephthalate Polymers 0.000 claims description 34
- -1 polybutylene terephthalate Polymers 0.000 claims description 9
- 239000012778 molding material Substances 0.000 claims description 8
- 229920005992 thermoplastic resin Polymers 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 239000003365 glass fiber Substances 0.000 description 29
- 238000004898 kneading Methods 0.000 description 18
- 239000004417 polycarbonate Substances 0.000 description 15
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/27—Sprue channels ; Runner channels or runner nozzles
- B29C45/2701—Details not specific to hot or cold runner channels
- B29C45/2708—Gates
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2023/00—Tubular articles
Definitions
- the present invention relates to an imaging optical lens unit and an optical lens holder.
- a camera module includes an image sensor such as an image sensor that also has a CCD and a CMOS force, and is used as an image pickup means for a mobile phone and a small electronic still camera.
- an image sensor such as an image sensor that also has a CCD and a CMOS force
- the factory is also demanding high image quality from the camera module. For this reason, the number of pixels in the image sensor provided in the camera module is increasing.
- the camera module is configured by combining an imaging optical lens unit with an imaging sensor.
- the optical lens holder for positioning the lens is molded with a resin so that the imaging optical lens unit is made inexpensive. Adopting the above configuration meets the demands of the factory.
- the imaging optical lens unit is composed of a plurality of lenses.
- the concentricity of the optical axis of each lens is required to be several microns or less, and the optical axial force of each lens.
- Imaging optical lens unit The optical axis must be tilted within a few minutes.
- the lens diameter of recent imaging optical lens units is becoming smaller, and accordingly, the lens barrel (optical lens holder) of the imaging optical lens unit is also required to have a small shape error. ing. Along with this, moldability for achieving precise shapes is also required for the resin used in injection molding.
- the resin is a structural material
- the mechanical strength and rigidity of the resin itself are often insufficient.
- an additive typified by glass fiber is mixed with the resin to increase the strength. And ensure rigidity.
- the glass fiber has a diameter of several micrometers or more and a length of several hundred micrometers. Therefore, when viewed from a microscopic viewpoint, the glass fiber is regarded as a large composition, and when it is viewed in micrometer units, the formed resin molding cannot be regarded as homogeneous.
- FIG. 19 shows a micrograph of a material formed by kneading glass fibers in PC (polycarbonate). As shown in FIG. 19, it is observed that the periphery of the glass fiber is insufficiently filled with resin.
- the glass fiber added to the resin flows while being rubbed with the mold during molding.
- the mold is usually formed using an iron-based material. For this reason, the flow velocity becomes small in a narrow portion where the frictional force with the glass fiber is large. It is pointed out that accurate transfer of the fine shape of the mold is difficult because of the poor fluidity at the time of injection molding, which is difficult to fill in a minute space.
- the design of thin-walled molded products also determines the functional and space demands, so that the design cannot be easily changed because of forces such as deformation, sink marks, and filling defects.
- a disk-shaped or cylindrical shaped body is symmetrical with respect to the central axis, and such a member that is symmetrical with respect to the central axis is not used.
- the above-described deformation has a great influence and becomes a big obstacle when combining them.
- the injection molding conditions of the optical lens holder and the lens, and the change of the mold including the gate position are changed.
- efforts are made to improve the shape accuracy of the unit as much as possible.
- Molded lens is light Assembling is done by pushing into the lens holder. Accordingly, the imaging optical lens unit obtained by combining the lens and the optical lens holder satisfies the target performance.
- the occurrence of a certain degree of defect is permitted at the stage of the manufacturing process of the optical lens or the optical lens holder alone, and the inspection is performed at the stage of the imaging optical lens unit formed by combining the optical lens and the optical lens holder. Therefore, good / bad judgment is made. After each single unit is manufactured, it is at best only to manage the rotational position of the lens around the optical axis.
- the molded product has a molding quality that is higher than the current molding technology level, and it takes time and money to correct the mold and determine the molding conditions.
- the conventional imaging optical lens unit is caused by factors caused by fluidity due to the additive added to the fat, thermal expansion coefficient and thermal conductivity of the fat itself. Yo Therefore, there is a problem in terms of molding accuracy when the optical lens holder is injection molded.
- the formation accuracy of the optical lens holder causes an axial shift in the central axes of the plurality of lenses, and affects the alignment of the central axes of the plurality of lenses required for the imaging optical lens unit. It will also be.
- the carbon nanofiber is a high aspect ratio carbon fiber having a diameter of submicrometer and a length of several tens of microns. It has been confirmed that carbon nanofibers have high strength just by being thin and long, and have extremely high cutting resistance against bending, and are not broken or cut even when bent at an acute angle.
- the carbon nanofiber is as high as metal and has thermal conductivity. In addition, it is thermally stable and has the property that it is not denatured at all in the temperature range used for molding the resin. Furthermore, since it is composed of almost pure carbon atoms, it does not contaminate the resin or cause chemical changes.
- the longitudinal elastic modulus of a mixture of resin and carbon nanofibers injection molded is
- Non-Patent Document 1 Morinobu Endo “Back of the field, the tip of science.” Bunya 2004, page 99-1
- Non-Patent Document 2 Proceedings of the Japan Society of Mechanical Engineers (No03-ll) Materials Mechanics Division Lectures 111-112 Disclosure of the invention
- the present invention solves the above-mentioned conventional problems, and in the imaging optical lens unit, the fluidity caused by the additive added to the resin, the thermal expansion coefficient, the heat conductivity of the resin itself.
- the purpose is to improve the accuracy of the shape by eliminating the problem of the accuracy of injection molding of the optical lens holder due to the factors caused by the properties.
- the present invention relates to an aspect of an optical lens unit and an aspect of an optical lens holder.
- the present invention can be applied to a plurality of modes of the optical lens unit and the optical lens holder.
- the present invention includes, as a plurality of forms, a first form that improves the shape accuracy of an optical lens holder by injection molding, a second form that suppresses distortion that occurs during injection formation in a disc-shaped or cylindrical optical lens holder. And a plurality of labels in the optical lens holder. There is a third form that easily adjusts the center axis.
- the first embodiment of the present invention includes two or more optical lenses and an optical lens holder for relatively positioning and fixing each of the optical lenses.
- Each optical lens includes a vertical reference plane that is perpendicular to the lens optical axis and a concentric reference plane that is parallel to the lens optical axis and has a concentric central axis.
- the optical lens holder includes a vertical seating surface and a concentric reference wall.
- the vertical seating surfaces are perpendicular to the central axis and parallel to each other, abutting the vertical reference surface of the optical lens, and the concentric reference wall has a central axis parallel to the central axis and concentric, and the concentric reference surface of the optical lens holder It has a hole shape with a diameter smaller than the straight diameter.
- the optical lens holder is molded with resin and contains carbon nanofibers in the form of multilayer tubes having a diameter of 80 to 300 nanometers and a length of 1 to 200 microns as additives. .
- the content of this content is in the range of 1 to 20% by weight.
- the resin material constituting the optical lens holder can be a thermoplastic resin material, for example, polybutylene terephthalate.
- the carbon nanofiber is a high aspect ratio carbon fiber having a diameter of submicrometer and a length of several tens of microns. It has been confirmed that carbon nanofibers have a high tensile strength just by being thin and long, have extremely high resistance to bending, and do not break or cut when bent at an acute angle. It is also known to have high thermal conductivity similar to metals. In addition, it is thermally stable in the temperature range used for molding the resin, and does not cause chemical modification of the resin.
- Carbon nanofibers can be dispersed throughout a very fine resin compared to glass fibers.
- Table 1 shows the conditions for injection molding of a molding material in which 5% by weight of VGCF (carbon nanofiber) is mixed with a mixed material of PBT and PC, and VGCF is not added. ⁇ Mixed material of PBT and PC The conditions for injection molding are shown.
- the injection molding apparatus used is an injection molding apparatus of a type in which a screw is measured and filled in a mold with a plunger, and TR18S3 manufactured by Sodick Plastic Co. is used.
- Table 1 shows that the molding material in which 5% by weight of VGCF is kneaded has good flowability with low PV switching pressure and maximum filling pressure.
- the molding material in which 5% by weight of VGCF is kneaded has a back pressure of less than half, which means that the molding material was smoothly filled in the mold and the fluidity was improved.
- Figure 1 shows the measurement data showing the relationship between the mixing ratio of VGCF and fluidity in PBT
- Table 2 shows the numerical values.
- the fluidity is evaluated by holding pressure. In the measurement, the pressure value at the screw position (10 mm) just before the end of molding is used as the holding pressure.
- the temperature of the resin during molding can be transferred quickly to the entire molded product, and a more uniform temperature distribution can be expected. Less deformation is expected. As a result, the shape accuracy of the thin cylindrical portion for positioning the lens is improved.
- Fig. 2 shows a fracture surface of a material formed by mixing 5% by weight of VGCF with PBT.
- the image example in Fig. 2 (a) has a magnification of 7000x
- the image example in Fig. 2 (b) has a magnification of 5000x.
- the white thread-like object force SVGCF can be confirmed to be uniformly dispersed.
- FIG. 3 shows the surface of a molded product formed of a material obtained by kneading VGCF in PBT.
- FIG. 3 shows the same magnification as FIG. In the surface image shown in Figure 3,
- CD VGCF cannot be confirmed. Note that the diagonal streaks in the image are the transfer of machining marks remaining on the mold surface, the granular structure is the effect of dust adhering to the mold, and the center line is the weld line.
- the carbon nanofiber has high tensile strength, and it is expected that the mechanical strength is improved according to the amount mixed with the resin.
- FIG. 4 and FIG. 5 are graphs obtained by measuring the Young's modulus of a material obtained by mixing carbon nanofibers with PBT (polybutylene terephthalate) and PC (polycarbonate).
- FIG. 4 shows the kneading ratio up to 5 wt%
- FIG. 5 shows the case where the kneading ratio is 5 wt% to 20 wt%.
- Table 3 shows Young's modulus values.
- the Young's modulus of PC increases almost in proportion to the amount of VGCF (carbon nanofiber).
- the Young's modulus of a material that is 5% by weight of VGCF mixed with PBT is 3. lGPa. This Young's modulus is about the same as that of PBT mixed with about 5% glass fiber.
- the carbon nanofibers have a linear expansion coefficient that decreases in proportion to the amount mixed with the resin. Therefore, the shrinkage when taking out the molded product from the mold is small, and it can be taken out in a colder state than normal molding. Generally, since the rigidity of the resin is higher as the temperature is lower, the deformation of the molded product due to internal stress can be suppressed by taking out the molded product at a lower temperature.
- FIG. 6 is a graph obtained by measuring the linear expansion of a material obtained by mixing carbon nanofibers with PBT (polybutylene terephthalate). The amount of linear expansion decreases with the amount of VGCF (carbon nanofiber).
- the measured specimen length is 10mm and the temperature range is 20 ° C ⁇ 140 ° C.
- the material kneaded with VGCF has the same mechanical properties as 5 to 10% by weight of glass fiber, and also has glass fiber! ⁇ . Due to its properties, it can realize injection molding that can be filled quickly and has little deformation at high temperatures.
- the imaging optical lens unit and its optical lens holder by applying carbon nanofibers to the imaging optical lens unit and its optical lens holder, it has good fluidity, high thermal conductivity, and high tensile strength. Due to strength and low linear expansion coefficient, molding can be performed with better shape accuracy compared to conventional molds made of a resin material, and the lens can be positioned at a position close to the design value. Quality is obtained. [0075] Further, defects generated in the inspection after assembly are reduced, and improvement in profitability can be expected. In addition, with a device capable of position control with 6 degrees of freedom for each lens, the best lens position is determined while taking a picture or chart, and the lens is fixed by a method such as adhesion. Therefore, the lens position can be fixed with a simpler device.
- the carbon nanofiber has high thermal conductivity. Due to this high thermal conductivity, the completed imaging optical lens unit has the advantage that heat can be quickly uniformized, the generation of thermal stress can be suppressed, and it is resistant to thermal shock, leading to improved environmental resistance. .
- the carbon nanofiber is much thinner than the glass fiber and does not hinder the flow of the resin in the mold if the amount mixed with the resin is set appropriately.
- the microstructure of the mold of the imaging optical lens unit can be filled, so that a fine and detailed design is possible, the accuracy of the molding wall thickness can be increased, and the smaller and more precise.
- a simple imaging optical lens unit can be designed.
- the shape accuracy can be improved.
- the optical lens holder has a disk-like or cylindrical shape, and this shape surrounds the injection molding resin injection gate around the central axis.
- the inner wall is provided with a continuous or equiangular interval.
- the disc-shaped or cylindrical optical lens holder is symmetric about the central axis.
- the gate arrangement is such that the resin flows radially from the center of the injection molded part, the resin is directed from the center to the outer periphery. After flowing, it is assumed that it flows in the direction parallel to the central axis at the outer periphery.
- the flow of the radial force resin outward from the center of the injection molded part is continuously or equiangularly spaced on the inner wall surrounding the central axis of the optical lens holder. This is realized by the gate arrangement.
- the resin flows symmetrically with respect to the central axis of the disc-shaped or cylindrical optical lens holder.
- the occurrence of nonuniformity of the resin is suppressed, and as a result, the occurrence of molding distortion is also reduced.
- the gate arrangement described above can be realized by adopting the above-described carbon nanofiber as an additive to be added to the resin.
- the size of the gate opening for injecting the resin into mold cavities with poor fluidity due to the glass fiber additive cannot be set small (for example, 0.2 mm).
- the gate opening size can be made small and arranged radially.
- the molding accuracy is improved, and the center of the circle inscribed in the cylindrical inner diameter of the actually molded barrel Can be close to the design center of the lens barrel.
- the shape of the deformation that occurs is expected to be symmetric about the central axis, and when the lens is pushed into the optical lens holder, the center of the lens is close to the center of the inscribed circle, The lens can be positioned correctly.
- the second embodiment of the present invention can be applied not only to the optical lens holder but also to injection-molded parts.
- this injection-molded part it is an injection-molded part molded with a resin, and the resin contains at least one kind of additive, and the additive has a diameter of 80 nanometers or more.
- It is a carbon nanofiber in the form of a multi-layer tube with a length of 300 nanometers or less and a length of 1 micrometer or more and 200 micrometers or less. It has a shape and is configured to have injection molding resin injection gates on the inner wall that surrounds the central axis of the injection molded part, either continuously or at equiangular intervals. According to the second embodiment, it is possible to suppress the deformation of the disk-shaped or cylindrical shaped body.
- the third embodiment relates to an optical lens holder, which is a cylindrical optical lens holder that accommodates a disk-shaped optical lens therein.
- the molded part shall be a resin containing carbon nanofibers in the form of multi-layer tubes having a diameter of 80 to 300 nanometers and a length of 1 to 200 microns as an additive.
- the longitudinal elastic modulus and the linear expansion coefficient of the molded member are set to be smaller than the longitudinal elastic modulus and the linear expansion coefficient of the molded member for molding the optical lens.
- the longitudinal elastic modulus of the molded part shall be in the range of 1.6 GPa to 3. lGPa, and the linear expansion coefficient of the molded part shall be in the range of 5 X 10-5 to 9 X 10 5 [mZm.k]. Therefore, it can be set according to the longitudinal elastic modulus and linear expansion coefficient of the optical lens.
- VGCF carbon nanofibers
- PP polypropylene
- the linear expansion coefficient can be obtained by kneading 1 to 7% by weight of VGCF (carbon nanofiber) in PBT (polybutylene terephthalate).
- Polyolefin resin is a material often used for the resin optical lens.
- the material has a transverse elastic modulus of 1.7 GPa to 3. lGPa.
- the linear expansion coefficient is 6 ⁇ 10 ⁇ 5 to 9 ⁇ 10 ⁇ 5 [/ ⁇ k].
- the lower limit of 1.6 GPa of the longitudinal elastic modulus of the molded member described above is equivalent to this value, based on the lower limit of 1.7 GPa of the longitudinal elastic modulus of the optical lens made of polyolefin olefin resin. Set a value smaller than the value.
- the upper limit of 3. lGPa of the longitudinal elastic modulus of the molded part is based on 3. lGPa, which is the upper limit of the longitudinal elastic modulus of the optical lens made of polyolefin resin, and is equal to this value, but smaller than this value. Determined by This value is obtained, for example, a 5 wt 0/0 Mix things VGCF in PBT.
- the elastic modulus of ordinary reinforcing grade obtained by mixing glass fiber with about 20% by weight is 6GPa, which is larger than that of optical lenses.
- the elastic coefficient is adjusted from 1.7 GPa to 3. lGPa using a VGCF kneaded material, a flexible optical lens holder whose rigidity is less than half that of the material containing glass fiber can be obtained. Can be made.
- the linear expansion coefficient of the optical lens holder equal to or less than the linear expansion coefficient of the optical lens, the optical lens performance can be improved.
- the linear expansion coefficient of the material of the optical lens holder lower than the linear expansion coefficient of the optical lens material, the expanded optical lens can be held by tightening in a high temperature environment.
- a material having a low coefficient of linear expansion has high rigidity even at a high temperature. Therefore, when the linear expansion coefficient of the optical lens holder is significantly different from the linear expansion coefficient of the optical lens that decreases, the optical lens expands more than the optical lens holder. Therefore, the expansion of the optical lens is strongly suppressed by the optical lens holder, and the optical lens is stressed and deformed. If the stress is within the yield stress, the deformation will be restored upon return to normal temperature, but if the stress exceeds the yield stress, the deformation may not be restored upon return to normal temperature.
- a uniform shape can be obtained with good fluidity, high thermal conductivity, high tensile strength, and low linear expansion coefficient obtained by using carbon nanofibers as an additive.
- the optical lens holder can be injection molded, and the longitudinal elastic modulus and linear expansion coefficient are equal to or less than that of the optical lens, so that flexibility when fitting the optical lens can be provided. .
- the inner diameter portion of the optical lens holder is deformed so as to follow the outer diameter portion of the optical lens due to its flexibility, and the deviation between the central axis of the optical lens holder and the central axis of the optical lens is suppressed. Can do. As a result, when a plurality of lenses are combined, the amount of deviation of the central axis of each lens is reduced, and deterioration in quality as an imaging optical lens unit is suppressed.
- the central axes of the plurality of lenses can be easily aligned in the optical lens holder.
- the fluidity resulting from the additive added to the resin, the thermal expansion coefficient, the thermal conductivity of the resin itself eliminates the problem of molding accuracy when the optical lens holder is injection-molded due to the factors caused by this, and increases the shape accuracy.
- Fig. 1 shows measured data showing the relationship between the mixing ratio of VGCF and fluidity in PBT.
- Fig. 2 is an image showing a fracture surface of a PBT molded from a material in which 5% by weight of VGCF is kneaded.
- FIG. 3 is an image showing the surface of a PBT molded with a material in which VGCF is kneaded.
- Fig. 4 is a measurement graph of Young's modulus of a material in which carbon nanofibers are mixed with PBT or PC.
- Fig. 5 is a measurement graph of Young's modulus of a material in which carbon nanofibers are mixed with PBT.
- Figure 6 is a measurement graph of the amount of linear expansion of a material in which carbon nanofibers are mixed with PBT.
- FIG. 7 is a diagram showing a cross-sectional view along the optical axis of the imaging optical lens unit.
- FIG. 8 is a cross-sectional perspective view of a cylindrical injection molded part.
- FIG. 9 is a cross-sectional perspective view of a cylindrical injection molded part.
- Fig. 10 shows the direction of the central axis showing the flow of resin when molding a cylindrical injection molded part. It is sectional drawing of a direction.
- FIG. 11 is a cross-sectional view in the direction perpendicular to the central axis showing the flow of resin when molding a cylindrical injection molded part.
- FIG. 12 is a perspective view of a disk-shaped injection molded part.
- FIG. 13 is a diagram for explaining a configuration example according to the second embodiment of the present invention.
- FIG. 14 is a diagram showing the variation in thickness at each measurement location according to each molding condition.
- FIG. 15 is a view for explaining an assembled state in which an optical lens is fitted into the optical lens holder of the present invention.
- FIG. 16 is a view of the force in the central axis direction of the optical lens holder.
- FIG. 17 is a view of the optical lens in which the axial force is also seen.
- FIG. 18 is a view for explaining an assembled state in which an optical lens is fitted in a conventional optical lens holder.
- FIG. 19 is a photomicrograph of a material formed by kneading glass fiber in PC (polycarbonate).
- the first form relates to a form for improving the shape accuracy of the optical lens holder by injection molding.
- FIG. 7 shows a cross-sectional view along the optical axis of the imaging optical lens unit.
- the imaging optical lens unit includes optical lenses 1 to 3 and an optical lens holder 4.
- the optical lenses 1 to 3 are attached so that each optical axis coincides with the optical axis of the optical lens holder 4.
- the optical axis 8 in a matched state is indicated by a one-dot chain line.
- the optical lenses 1 to 3 are fixed to the optical lens holder 4 with adhesives 5 to 7.
- the optical lens holder 4 has a cylindrical shape, and the optical lenses 1 to 3 have a flat disk shape.
- FIG. 8 shows the components of the imaging optical lens unit separated from each other and arranged in a cross-section along the optical axis in order to see the components easily.
- Each optical lens includes a vertical reference plane perpendicular to the lens optical axis and a concentric reference plane having a central axis parallel to the lens optical axis.
- the optical lens 1 includes a vertical reference surface 15 perpendicular to the lens optical axis 8 and a concentric reference surface 16 having a central axis parallel to the lens optical axis 8 and the optical lens 2 includes the lens optical axis.
- 8 has a vertical reference surface 17 perpendicular to 8 and a concentric reference surface 18 having a central axis parallel to and concentric with the lens optical axis 8
- the optical lens 3 has a vertical reference surface 19 perpendicular to the lens optical axis 8 and the lens light.
- Concentric reference plane 20 having a central axis parallel to axis 8 and concentric.
- the optical lens holder 4 has a vertical seating surface that is perpendicular to the central axis 8 and parallel to each other and abuts against the vertical reference surface of the optical lens in order to position the optical lenses 1 to 3.
- a hole-shaped concentric reference wall having a central axis parallel to the central axis 8 and having a diameter smaller than the diameter of the concentric reference surface of the optical lens.
- the optical lens holder 4 includes a vertical seating surface 9 that contacts the vertical reference surface 15 of the optical lens 1, a vertical seating surface 11 that contacts the vertical reference surface 17 of the optical lens 2, and the vertical of the optical lens 3.
- Each of the vertical seating surfaces 13 is in contact with the reference surface 19, and has a concentric reference wall 10 corresponding to the concentric reference surface 16 of the optical lens 1 and a concentric reference wall 12 corresponding to the concentric reference surface 18 of the optical lens 2.
- concentric reference walls 14 corresponding to the concentric reference surface 20 of the optical lens 3.
- FIGS. 7 and 8 the optical axes of the optical lens holder and the optical lens are shown as a common optical axis 8 on the assumption that the optical axes coincide with each other.
- Each of the optical lens 1, the optical lens 2, and the optical lens 3 has an aspherical shape of lens action.
- This aspherical shape is a portion indicated by a curved line in FIGS. Since the aspheric shape itself is not directly related to the present invention, the description is omitted.
- the vertical reference plane and concentric reference plane of each lens are assumed to be correct with respect to the optical axis.
- FIGS. 7 and 8 detailed shapes such as lens surface shapes and chamfers that are not directly related to the description of the present invention, and spacers are omitted.
- the optical lens holder 4 contains at least one additive.
- As an additive use V-shaped VGCF and carbon nanofibers in the shape of a multilayer tube with a diameter of 80 to 300 nanometers and a length of 1 to 200 micrometer.
- the kneading ratio is in the range of 1 to 20% by weight, and it is added to the resin and molded.
- Mechanical rigidity is improved by mixing carbon nanofibers with rosin.
- PBT has the property that the proportion of VGCF increases from 1 wt% to about 50 wt%, and the linear expansion coefficient can be reduced while ensuring fluidity. Suitable for holding barrel material.
- the holder of the imaging optical lens unit formed of a resin material mixed with carbon nanofibers is a conventional holder. It can exhibit better performance than the holder molded by this method.
- the second form relates to a form for suppressing molding distortion of a disk-shaped or cylindrical shaped body such as an optical lens holder.
- a disk-shaped or cylindrical injection-molded part will be described as an example.
- an optical lens holder that holds a disk-shaped optical lens is suitable.
- FIG. 9 is a cross-sectional perspective view of a cylindrical injection molded part.
- the injection-molded part 21 is a cylindrical body having a cylindrical wall portion concentrically as the central axis 23.
- the cylindrical body includes a gate 22 for injecting a resin to be injection molded.
- the gate 22 shown in FIG. 9 is formed continuously or equiangularly in an annular shape on the inner wall on one end side of the cylindrical body.
- Fig. 10 is a cross-sectional view showing the flow of resin when molding a cylindrical injection-molded part, and shows the flow of resin including the central axis.
- the arrow 24 in FIG. 10 indicates the flow of the grease.
- the grease injected from the gate 22 flows radially from the center toward the outer periphery, reaches the outer wall portion of the cylindrical body, and then reaches the central axis 23. It flows along the direction and forms the cylindrical wall part of the cylindrical body.
- the cylindrical body has a cylindrical opening formed at a central portion passing through the central axis 23.
- the optical lens is held on the inner wall portion of the opening.
- FIG. 11 is a cross-sectional view showing the flow of resin when molding a cylindrical injection-molded part, and shows the flow in a direction orthogonal to the central axis.
- the arrow 25 in FIG. 11 indicates the direction in which the grease flows, and the grease injected from the gate (not shown in FIG. 11) flows radially in the direction of the arrow 25 from the center toward the outer periphery.
- the gate 22 is disposed in a thin strip shape so as to draw a circle on the inner wall of the injection molded part 21. Since the gate 22 is symmetric with respect to the central axis 23 of the injection-molded part 21, the flow direction of the grease indicated by the arrows 24 and 25 in FIGS. Filled in.
- FIG. 12 is a perspective view of a disk-shaped injection molded part.
- the disk-shaped injection-molded part 26 has a substantially annular or donut shape with a central axis 28 as the center, and an opening is formed in the central portion through which the central axis 28 passes.
- the optical lens is held on the inner wall portion of the opening.
- the injection molded part 26 has a gate 27 on the inner wall portion of the opening.
- the resin injected from the gate 27 flows radially from the center side toward the outer periphery.
- the gate 27 is disposed on the inner wall of the injection-molded component 26 in a thin strip shape at equiangular intervals around the central axis 28. Since the gate 27 is axisymmetric with respect to the central axis 28 of the injection-molded part 26, the grease flows and fills in the direction indicated by the grease flow arrow 29 in FIG.
- the injection molded resin injection gate is continuously or equiangularly spaced so as to surround the central axis of the injection molded part. By arranging it on the inner wall, it is possible to fill the resin by flowing the axillary axisymmetrically with respect to the central axis.
- the carbon nanofiber 1 exhibits high fluidity when kneaded at about 1% by weight, but improvement in rigidity and heat resistance can be realized by devising the kneading ratio. However, if the carbon nanofiber kneading ratio exceeds 10% by weight, the fluidity deteriorates. Therefore, the range of 3 to LO weight% is preferable, and an appropriate kneading ratio considering the balance between strength and fluidity. Set.
- the second embodiment of the present invention is particularly effective when the injection-molded part is small and sufficient space is not available for installing the resin injection gate, and is a disk-shaped or cylindrical injection-molded part. Injection molding is possible even when the thickness of the cross section of the gate provided on the inner wall of the product is 0.2 mm or less.
- FIG. 13 is a diagram for explaining a configuration example according to the second embodiment of the present invention. Here, an example of a thin part having a thickness of 0.18 mm is shown. The numbers in FIG. 13 indicate the measurement points where the thickness variation is measured.
- Table 4 shows the molding conditions for injection molding
- Table 5 shows the variation in thickness at each measurement location according to each molding condition.
- FIG. 14 illustrates the results of Table 5.
- the injection speed increases as the fluidity of the resin improves.
- the measurement examples No. 3 to No. 5 even if the injection pressure is increased, if the flow velocity is low, the viscosity increases due to heat dissipation and a good flow cannot be obtained, so the thickness decreases.
- the third mode relates to a mode in which the central axes of a plurality of lenses are easily aligned in the optical lens holder.
- FIG. 15 is a view for explaining an assembled state in which the optical lens is fitted into the optical lens holder of the present invention.
- FIG. 18 shows an assembled state in which an optical lens is fitted into a conventional optical lens holder.
- a resin kneaded with VGCF is used as a material for the optical lens holder.
- the optical lens holder 40 includes an inner diameter portion 41, and the outer diameter portion 44 of the optical lens 43 is fitted into the inner diameter portion 41. It should be noted that the center axis 42 of the optical lens holder 40 and the center axis 45 of the optical lens 43 do not always coincide with each other, and an axis deviation occurs.
- circle 49 represents the ideal circle of the virtual.
- FIG. 16 is a diagram showing the central axial force of the optical lens holder.
- the optical lens holder 31 includes an inner diameter portion 32 and a central shaft 33.
- FIG. 17 is a view of the optical lens viewed from the central axis direction, and is fitted into the optical lens holder 31.
- the optical lens 34 includes an outer diameter portion 35 of the lens and a central axis 36 of the lens.
- FIG. 18 shows an assembled state in which an optical lens is fitted into a conventional optical lens holder.
- the inner diameter portion 37 of the optical lens holder 31 and the outer diameter portion 35 of the optical lens 34 are both deformed.
- the optical lens 34 is fitted into the optical lens holder 31.
- Fig. 5 is a conventional assembly state diagram in which the optical lens 34 is fitted in the optical lens holder 31 and the force in the central axial direction is also seen.
- 37 is a slightly deformed inner diameter portion of the optical lens holder 31, and 38 is a slightly deformed outer diameter portion of the optical lens 34. 16 to 18, the deviation from the virtual ideal circle 39 is drawn with emphasis.
- the shape accuracy of the optical lens holder is improved by injection molding with a material in which carbon nanofibers are kneaded with a resin, but FIG. As shown in Fig. 17, the error of several micrometers cannot be completely eliminated.
- the optical lens 34 is inserted into the optical lens holder 31 as shown in FIG. 35 is deformed and the center axis 36 is offset from the center axis 33 of the optical lens holder 31.
- the central axis 36 of each lens is slightly shifted, resulting in a problem that the quality of the imaging optical lens unit is greatly deteriorated.
- the elastic modulus of the material mixed with about 20% by weight of glass fiber is 6GPa.
- This elastic modulus is a normal reinforced grade.
- the stiffness represented by the numerical value of the elastic modulus is higher than the stiffness of an optical lens made of polyolefin resin. If a low-rigidity optical lens is installed in such a high-rigidity optical lens holder, the optical lens side will absorb the misalignment of the central axis. The characteristics may deteriorate.
- the rigidity is less than half of the material containing glass fiber. It is possible to make a flexible optical lens holder with the same elastic modulus as that of an optical lens made of polyolefin resin.
- Polyolefin resin is a material frequently used for resin optical lenses.
- the longitudinal elastic modulus of the material is 1.7 GPa to 3.
- lGPa and the linear expansion coefficient is 6 X 10-5 to 9X10-5.
- the longitudinal elastic modulus is about 3. lGPa, and the linear expansion coefficient is 6.6 X 10 — It is about 5th power. This value is close to that of a normal optical lens.
- the longitudinal elastic modulus of a certain grade of polyolefin resin is 2.lGPa, and the linear expansion coefficient is 7 ⁇ 10 to the fifth power.
- the longitudinal elastic modulus is 2.7 GPa, which can be closer to the optical lens.
- VGCF has high fluidity when kneaded at about 1% by weight.
- a kneading ratio it is possible to improve rigidity and heat resistance.
- an appropriate mixing ratio will be adopted in consideration of rigidity and fluidity. For example, about 1 to 7% by weight is preferable.
- Carbon nanofibers are much thinner and more flexible than glass fibers, and in order to increase the fluidity of the resin, the flow of the resin is fast and smooth even in narrow channels. Therefore, the accuracy of molding wall thickness is higher than that of conventional grease.
- the elastic coefficient can be made at least equal to that of the optical lens to make the optical lens holder flexible and uniform. it can.
- the inner diameter portion 41 of the optical lens holder 40 is the same as the optical lens 4.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Lens Barrels (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
Description
Claims
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CN114019647A (zh) * | 2018-04-20 | 2022-02-08 | 大立光电股份有限公司 | 环形光学元件及成像镜头 |
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JP2004317990A (ja) * | 2003-04-18 | 2004-11-11 | Sony Corp | レンズ固定方法、レンズ固定装置、及びレンズ本体 |
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JPS61160710A (ja) * | 1985-01-08 | 1986-07-21 | Canon Inc | レンズ鏡筒 |
JPH04204610A (ja) * | 1990-11-30 | 1992-07-27 | Mitsubishi Electric Corp | 光学装置 |
JP2000208406A (ja) * | 1999-01-18 | 2000-07-28 | Nikon Corp | 投影露光装置 |
JP2003246927A (ja) * | 2002-02-26 | 2003-09-05 | Kanegafuchi Chem Ind Co Ltd | ポリイミド樹脂組成物、ポリイミドフィルム、ポリイミド管状物及び電子写真用管状物 |
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JPS58179626A (ja) * | 1982-04-15 | 1983-10-20 | Sony Corp | 射出成形装置 |
JPH08101329A (ja) * | 1994-09-30 | 1996-04-16 | Mitsubishi Chem Corp | コリメーターレンズホルダー |
JP2003284359A (ja) * | 2002-03-26 | 2003-10-03 | Seiko Precision Inc | 導電性可動子及び当該導電性可動子を備えた静電アクチュエータ |
JP2003311841A (ja) * | 2002-04-26 | 2003-11-06 | Kurashiki Kako Co Ltd | 樹脂筒の嵌め込み方法及びそのためのダイス、繊維含有樹脂筒の成形方法及びその成形装置、繊維含有樹脂筒、並びに該樹脂筒を有する防振成形体 |
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