WO2005073780A1 - ポリゴンミラーおよびポリゴンミラー成形用金型 - Google Patents
ポリゴンミラーおよびポリゴンミラー成形用金型 Download PDFInfo
- Publication number
- WO2005073780A1 WO2005073780A1 PCT/JP2005/001141 JP2005001141W WO2005073780A1 WO 2005073780 A1 WO2005073780 A1 WO 2005073780A1 JP 2005001141 W JP2005001141 W JP 2005001141W WO 2005073780 A1 WO2005073780 A1 WO 2005073780A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pin gate
- shortest distance
- reflection surface
- reflection
- polygon mirror
- Prior art date
Links
- 238000000465 moulding Methods 0.000 title claims description 29
- 230000002093 peripheral effect Effects 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 description 37
- 229920005989 resin Polymers 0.000 description 35
- 239000011347 resin Substances 0.000 description 35
- 238000001746 injection moulding Methods 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 3
- 229920000089 Cyclic olefin copolymer Polymers 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 229920005992 thermoplastic resin Polymers 0.000 description 2
- 239000004793 Polystyrene Substances 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- -1 for example Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000113 methacrylic resin Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920001230 polyarylate Polymers 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/08—Mirrors
- G02B5/09—Multifaceted or polygonal mirrors, e.g. polygonal scanning mirrors; Fresnel mirrors
-
- 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
- B29C45/0046—Details relating to the filling pattern or flow paths or flow characteristics of moulding material in the mould cavity
-
- 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
-
- 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
-
- 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
- B29L2011/00—Optical elements, e.g. lenses, prisms
- B29L2011/0058—Mirrors
Definitions
- the present invention relates to a polygon mirror formed by injection molding and a molding die used for the molding.
- a polygon mirror is provided with a plurality of reflecting surfaces to switch and scan reflected light by rotating.
- the polygon mirror is formed by injection molding using a mold.
- Japanese Patent Application Laid-Open Nos. 8-238682 and 2619244 disclose a method for manufacturing a polygon mirror.
- FIG. 10 shows a manufacturing method disclosed in Japanese Patent Application Laid-Open No. 8-238682.
- the polygon mirror 110 includes a flat portion 112 and a plurality of reflecting surfaces 114 connected to each other in a state of being disposed on the outer peripheral side surface of the flat portion 112.
- the plane portion 112 is connected to an intermediate portion on the back side of each reflection surface 114.
- An annular boss 112a to which the rotating body is attached is formed at the center of the flat portion 112.
- a mold for ejecting such a polygon mirror 110 is provided with a spnole 141 and a disk gate 140 extending horizontally in a terminal force of the sprue 141.
- the sprue 141 extends along the rotation axis CL of the polygon mirror 110 to be formed.
- Reference numeral 145 denotes a slide type for forming the reflection surface 114 of the polygon mirror 110.
- a molten resin material is injected at a predetermined pressure onto the spnole 141. After filling the resin material into the mold cavity from the disc gate 140, the resin material is cooled to solidify the resin material. Thereafter, the mold is opened and the molded product is ejected by the ejection pin 147, thereby completing the injection molding.
- FIGS. 11A and 11B show a manufacturing method disclosed in Japanese Patent No. 2619244.
- the polygon mirror 210 includes a boss portion 212a, a plate-shaped portion 212, and a reflection surface 214.
- the boss 212a is formed at the center and serves as a part to be attached to the rotating body.
- the plurality of (eight) plate-like portions 212 extend radially from the boss portion 212a.
- the reflection surface 214 is formed at the tip of each plate-like portion 212 extending from the boss portion 212a.
- the mold is provided with cavities for forming the boss portion 212a, the plate-like portion 212, and the reflection surface 214.
- the sprue 241 extends corresponding to the center of the boss 212a in order to fill the mold cavity with the molten resin material.
- Runners 242 extend radially from the sprue 241.
- the runners 242 extend so as to correspond to the respective plate-like portions 212.
- the tip of the runner 242 is a pin gate 245 that supplies a resin material into the cavity.
- the number of the pin gates 245 is equal to the number of the reflecting surfaces 214 so as to correspond to each of the reflecting surfaces 214.
- the pin gate 245 is disposed at a substantially central portion in the width direction of the plate portion 212. That is, the pin gates 245 are arranged on bisectors perpendicular to the respective reflection surfaces 214.
- each reflecting surface 214 is substantially the same distance from the pin gate 245. Therefore, the molten resin material flows uniformly and spreads evenly. Therefore, a weld line generated between the adjacent reflection surfaces 214 is generated at the ridge line 235 (see FIG. 11A) which is a boundary portion of the plate-shaped portion 212, and the generation of a weld line on the reflection surface 214 is prevented.
- An object of the present invention is to provide a polygon mirror which can be attached to a rotating body satisfactorily and which prevents a weld line from being generated, and a molding die used for molding the polygon mirror. Aim.
- One aspect of the polygon mirror according to the present invention is:
- the shortest distance from the edge formed by the intersection of the reflection surface M (1) and the plane portion to the pin gate mark L (l) is DM (1), and the reflection surface M (2) and the plane
- the shortest distance from the edge formed by intersection with the portion to the pin gate mark L (2) is DM (2), and the reflection surface M (n) intersects with the plane portion.
- the shortest distance from the formed edge to the pin gate mark L (n) is DM (n),
- the shortest distance between the pin gate mark L (l) and the pin gate mark L (2) is DL (1), and the shortest distance between the pin gate mark L (2) and the pin gate mark L (3) is DL (2),..., when the shortest distance between the pin gate trace L (n) and the pin gate trace L (l) is DL (n),
- One embodiment of the polygon mirror molding die according to the present invention is:
- the shortest distance from the edge formed by the intersection of the reflection surface M (1) and the plane portion to the pin gate L (1) is DM (1), and the reflection surface M (2) and the plane portion Is defined as DM (2) from the edge formed by intersecting with the pin gate L (2), and the reflection surface M (n) intersects with the plane portion.
- the shortest distance from the edge to be formed to the pin gate L (n) is DM (n),
- the shortest distance between the pin gate L (l) and the pin gate L (2) is DL (1), and the shortest distance between the pin gate L (2) and the pin gate L (3) is DL (2)
- the shortest distance between the pin gate L (n) and the pin gate L (l) is DL (n)
- FIG. 1 is a schematic plan view showing a polygon mirror according to a first embodiment of the present invention.
- FIG. 2 is a schematic perspective view showing a molded body for molding the polygon mirror according to the first embodiment.
- FIG. 3 is a schematic vertical sectional view of the molded body shown in FIG. 2 for molding the polygon mirror according to the first embodiment.
- FIG. 4 is a schematic enlarged sectional view of a pin gate shown in FIG. 3 of the polygon mirror according to the first embodiment.
- FIG. 5 shows how a resin material flows during molding of the polygon mirror according to the first embodiment. It is a schematic perspective view which shows.
- FIG. 6 is a schematic plan view showing a case where pin traces of the polygon mirror according to the first embodiment are not preferable.
- FIG. 7 is a longitudinal sectional view of the molded body shown in FIG. 6 for molding an undesired polygon mirror according to the first embodiment.
- FIG. 8 is a schematic perspective view showing how a resin material flows during molding of an undesired polygon mirror according to the first embodiment.
- FIG. 9 is a schematic plan view showing a polygon mirror according to a second embodiment of the present invention.
- FIG. 10 is a cross-sectional view showing a conventional polygon mirror forming method.
- FIG. 11A is a plan view showing another conventional method for forming a polygon mirror.
- FIG. 11B is a cross-sectional view showing another conventional method for forming a polygon mirror.
- the polygon mirror 10 is used by being attached to a rotating shaft of a bar code scanner, a laser beam printer, a vehicular optical scanner, or the like, for example. By rotating the polygon mirror 10 around a predetermined rotation axis, it is possible to switch or run the reflected light.
- the polygon mirror 10 is formed by, for example, injection molding a thermoplastic resin material.
- thermoplastic resin material for example, polycarbonate, methacrylic resin, polyarylate, polystyrene, cycloolefin polymer, and other appropriate resin materials are used.
- cycloolefin polymer for example, trade name “ZONEX 480S” (manufactured by Nippon Zeon Co., Ltd.) can be used.
- the polygon mirror 10 includes a plate-shaped flat portion 12 attached to a rotating body, and a cylindrical reflecting surface group 14 formed on an edge of the flat portion 12. I have.
- the flat portion 12 is formed so as to close one end (the upper end in FIG. 1) of the reflection surface group 14.
- the reflecting surface group 14 includes reflecting surfaces M (1), M (2), M (3), M (4), M (5), and M (6) described later.
- a rectangular shape (a prismatic shape) orthogonal to the plane portion 12 or a reflecting surface M (1) -M (6) is formed in a substantially umbrella shape having an angle other than an angle orthogonal to the plane portion 12. . That is, in the embodiment shown in FIG. 1, the reflecting surface M (1) —M (6) is formed in an umbrella shape that is inclined obliquely outward from the plane portion 12, but vertically hangs down from the plane portion 12. It may be.
- the reflecting surfaces M (l) M (6) may have different angles with respect to the P-contact surface, or may have the same angle.
- the reflecting surface group 14 includes a plurality (n) of reflecting surfaces M.
- n a description will be given assuming that six reflecting surfaces M (l) M (6) are provided.
- Each of the reflecting surfaces M (1) to M (6) is formed into an appropriate surface such as a flat surface, a spherical surface, a rotationally symmetric aspherical surface, and a free-form surface.
- a metal thin film such as aluminum, silver, or gold is formed into a mirror-like shape by vapor deposition, sputtering, or the like. Therefore, when light is applied to the reflecting surfaces M (l) -M (6), the light is reflected by the reflecting surfaces M (1) -M (6).
- a triangular chamfer 16 is formed in a lower portion of the reflection surface M (l) —M (6). These chamfers 16 may be omitted because the force S disposed between the adjacent reflecting surfaces M (l) and M (6) is not optically used in many cases.
- a circular mounting hole 12 a is penetrated in the thickness direction at the center of the flat portion 12 closing the upper end of the umbrella-shaped reflecting surface group 14.
- the polygon mirror 10 is attached to the rotating body by passing a rotating shaft of a rotating body (not shown) through the mounting hole 12a.
- a rotating means such as a motor is incorporated in the rotating body. Therefore, by driving the rotating means, the rotating body is rotated. That is, the polygon mirror 10 rotates integrally with the rotator by the rotation of the rotator, and the above-described switching and scanning of the reflected light are performed.
- the mounting hole 12a is unnecessary as long as the flat portion 12 can be mounted on the rotating body. For example, when a plurality of screws (not shown) are passed through the flat portion 12 and fastened to the rotating body, the polygon mirror 10 is attached to the rotating body.
- the entire polygon mirror 10 is formed by injection molding. Inject resin material into a mold (not shown, but having a shape for molding polygon mirror 10) A gate section 34 described later is arranged at a position facing the plane section 12 of the polygon mirror 10. Therefore, on the upper surface of the plane portion 12 of the polygon mirror 10, the pin gate marks L (l), L (2), L (3), L (4), L (5), L (6) is formed.
- the pin gate traces L (l) -L (6) correspond to each of the six reflecting surfaces M (l) -M (6), and six are located around the mounting hole 12a in the plane portion 12. Are located in
- the pin gate mark L (l) corresponds to the reflecting surface M (l)
- the pin gate mark L (2) corresponds to the reflecting surface M (2).
- the numbers in parentheses sequentially correspond to the numbers on the reflection surface.
- the molded body 20 in the mold including the polygon mirror 10 is formed.
- the mold is provided with a sprue runner portion 32 corresponding to the sprue runner and a gate portion corresponding to the gate.
- the gate unit 34 is arranged near a position corresponding to each of the reflection surfaces M (l) M (6).
- the leading ends (lower ends) of the respective gate portions 34 correspond to the respective reflecting surfaces M (l) -M (6).
- the resulting pingate trace is L (l) -L (6).
- the pin gate trace L (l) -L (6) is formed by the pin gate at the tip of each gate section 34. Therefore, in this embodiment, six pin gates are indicated by using the reference symbols L (1) and L (6), similarly to the pin gate traces.
- the shortest distance between the pin gate trace L (l) and the pin gate trace L (2) is DL (1)
- the distance between the pin gate trace L (2) and the pin gate trace L (3) is The shortest distance is DL (2).
- the shortest distance between adjacent pin gate traces is described in correspondence with the numbers in parentheses in the pin gate traces. Therefore, the shortest distance between the pin gate trace L (5) and the pin gate trace L (6) is DL (5), and the shortest distance between the pin gate trace L (l) and the pin gate trace L (6) is DL (6).
- the polygon mirror 10 is formed by setting conditions such that DM (2)> DL (l) / 2,..., DM (6)> DL (5) / 2.
- L> DL (6) / 2 force DM (1) X1.
- the polygon mirror 10 is formed under the conditions set to be / 2.
- the shortest distances DM (1) -DM (6) are each less than half of the shortest distances DL (1) DL (6). Therefore, the shortest distance DM defined in the same manner as the above-described distance R is formed longer than half of the shortest distance DL between adjacent pin gate traces L.
- the resin material to be injection-molded comes into contact with the resin material injected from the adjacent pin gate L and then integrally forms on the reflection surface side. Flow away. Therefore, the occurrence of weld lines on the polygon mirror 10 is prevented. Then, a polygon mirror 10 having excellent surface accuracy and strength is formed.
- the shortest distance from the edge formed by the intersection of the back surface of the reflection surface M (l) and the plane portion 12 to the pin gate L (1) is DM (1)
- the back surface of the reflection surface M (2) is The shortest distance from the edge formed by the intersection of the plane part 12 and the pin gate L (2)
- the back surface of the reflective surface M (6) intersects the plane part 12
- the shortest distance from the edge formed by this to the pin gate L (6) is DM (6)
- the shortest distance between the pin gate L (l) and the pin gate L (2) is DL (1)
- the pin gate L ( The shortest distance between pin gate L (3) and pin gate L (3) is DL (2)
- the shortest distance between pin gate L (l) and pin gate L (6) is DL (6).
- a mold whose conditions are set to be DL (5) / 2 is used. That is, the mold is formed so as to meet the conditions described above.
- the shortest distance DM (1) -DM (6) is less than half of the shortest distance DL (1) -DL (6). Therefore, the shortest distance DM defined in the same manner as the distance R described above is formed longer than half of the shortest distance DL between the pin gates L adjacent to each other.
- the resin material injected from the pin gate is the resin material from the pin gate in contact with the P. After coming into contact with the material, it flows integrally to the reflective surface M side. For this reason, the occurrence of a mold line in the polygon mirror 110 is prevented. Therefore, a mold capable of forming the polygon mirror 10 having excellent surface accuracy and strength is provided.
- the shortest distance DM (1) DM (6) can also be defined as follows.
- the distance DM (l) is the shortest distance from the edge formed by the intersection of the reflecting surface M (l) and the plane portion 12 to the pin gate mark L (1)
- the distance DM (2) is the reflecting surface M ( The distance from the edge formed by the intersection of (2) and the plane part 12 to the pin gate mark L (2) will be described below, and the pin gate mark L corresponding to the reflection surface will be described in correspondence with the number in parentheses. . Therefore, the shortest distance from the edge formed by the intersection of the reflection surface M (6) and the plane portion 12 to the pin gate mark L (6) is DM (6).
- the shortest distance DM defined in this way is the length of a perpendicular line that is vertically lowered from the pin gate trace L to the intersection of the reflection surface M and the plane portion 12. Even with this definition, as described above, the shortest distance DM (1) —DM (6) from the edge formed by the intersection of the back surface of the reflection surface M and the plane portion 12 to the pingate mark L There is no substantial difference from the definition of.
- these wall thicknesses are set as in 0.7 ⁇ t / t ⁇ 1.3. In this case,
- it is set as 0.85 ⁇ t Zt ⁇ 1.15. More than thickness t
- ⁇ t ⁇ 3mm and lmm ⁇ t ⁇ 3mm More preferably, 1.
- the thickness of the plane portion 12 is t
- the thickness of the reflection surface M (l) M (6) is t.
- t and t satisfy lmm ⁇ t ⁇ 3mm and lmm ⁇ t ⁇ 3mm.
- FIG. 4 shows an enlarged cross-sectional view of the pin gate L (l).
- the diameter of the pin gate L (l) is, and the opening angle of the pin gate L (l) is equal, 0.8 mm ⁇ ⁇ ⁇ ! ⁇ 1.6 mm, and 15 ° ⁇ ⁇ ⁇ 35 ° It is good that there is.
- the diameter ⁇ d is less than 0.8 mm, molding defects such as short shots and sink marks (sink marks) occur in the polygon mirror 10 in which the molten resin material does not easily flow during injection molding. If the diameter ⁇ i> d exceeds 1.6 mm, a trace of the gate L will remain on the polygon mirror 10 where the resin is not easily cut off at the gate L.
- the opening angle ⁇ force is less than S15 °, the resin material at the gate L is not easily cut, and a trace of the gate L remains on the polygon mirror 10 for a long time. If the opening angle ⁇ force exceeds ° 5 °, the pin gate L tends to be worn when molding is repeated.
- the diameter ⁇ d and the opening angle ⁇ of the pin gate L are within the above-described conditions.
- FIG. 5 shows a state in which the molten resin material is injection-molded based on the above conditions. There is no weld line on the adjacent reflective surface ⁇ . This is because, as described above, the resin materials injected from the adjacent pin gates L come into contact with each other to be integrated, and then flow so as to form the reflection surface ⁇ .
- the pin gate traces L (l) and L (L) are obtained from the sides (edges) formed by the intersections of the reflecting surfaces M (l), ⁇ (2), (2),..., L
- the shortest distance to (6) is set to less than half of the shortest distance between the adjacent pin gate traces. That is, the shortest distance between the pin gate traces From the intersection of the reflecting surfaces M (l), M (2),..., M (6) and the plane part 12, the pingate traces L (l), L (2),..., L ( The shortest distance up to 6) was formed longer.
- the resin material to be injection molded comes into contact with the resin material from the adjacent pin gates L (l), L (2), , M (2),..., M (6), thereby preventing the occurrence of weld lines.
- the polygon mirror 10 excellent in surface accuracy and strength can be formed.
- the polygon mirror 10 since the polygon mirror 10 having excellent surface accuracy is formed, the polygon mirror 10 can be attached to the rotating body satisfactorily. Therefore, it is possible to provide a highly durable polygon mirror 10 that can be suitably used even in a severe environment such as a high temperature, a low temperature, and a high humidity such as a vehicle.
- the thickness t of the plane portion 12 and the thickness t of the reflecting surfaces M (l), M (2), ..., M (6) are set as 0.7 ⁇ t
- the pin gate L is not disposed at the portion where the mounting hole 12a is formed. For this reason, the mounting hole 12a to the rotating body can be formed with high precision. Therefore, the mounting hole 12a can be easily mounted on the rotating body.
- FIG. 6 shows a polygon mirror when molded under the conditions described in the first embodiment.
- FIG. 7 shows a compact including a polygon mirror.
- the pin gate trace L (l) -L (6) (also the pin gate L (l) -L (6)) has a reflection surface M (l) —M (6). ) And the plane portion 12 are formed at positions very close to the edge where they intersect. Therefore, the shortest distance DM is equal to the adjacent pin gate mark L (l)
- FIG. 8 shows a state where the polygon mirror is injection-molded under the conditions shown in FIGS. 6 and 7.
- a weld line 26 occurs at the boundary between the reflection surfaces M (l) and M (6). This is because the injected resin material flows so as to form the reflection surface M before coming into contact with the resin material from the adjacent pin gate L. That is, the adjacent pin gate L force has a small association angle F at which the injected resin material comes into contact. The larger the association angle F, the better.
- the polygon mirror 30 includes a cylindrical reflecting surface group 14 having three reflecting surfaces M (l), M (2), and M (3) formed as outer peripheral side surfaces, A substantially triangular plane portion 12 closing the upper end of the surface group 14 is provided.
- the reflecting surface group 14 is formed in a substantially prismatic shape.
- the molten resin material is injected and molded.
- Pin gate traces in injection molding pin gates in dies so that L (l), L (2), L (3) correspond to the respective reflecting surfaces M (l), M (2), M (3) Are located.
- the pin gate traces L (l), L (2), and L (3) are arranged around a mounting hole 12a formed in the plane portion 12.
- the shortest distance DL of the pin gate trace L that is in contact with P for example, the shortest distance DL (1) between the pin gate trace L (1) and the pin gate trace L (2) is the circular mounting hole 12a.
- the shortest distance DL is defined, and the shortest distance DM (not shown) from the edge formed by the intersection of the reflection surface M and the plane portion 12 to the pin gate L is determined in the first embodiment. It is defined in the same way as the form. Further, the relationship between the shortest distances DM and DL is set in the same manner as in the first embodiment. Then, weld lines are less likely to occur during injection molding, and a polygon mirror 30 having excellent surface accuracy and strength is formed. In addition, a mold is provided in which weld lines are less likely to occur during injection molding and can mold the polygon mirror 30 having excellent surface accuracy and strength.
- the polygon mirror of the present invention since the flow of the resin material to be injected is uniform, the surface accuracy without weld lines is good, and the strength is excellent.
- the polygon mirror molding die of the present invention it is possible to surely mold a polygon mirror having excellent surface accuracy and strength in which weld lines are not generated.
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- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Optical Elements Other Than Lenses (AREA)
- Mechanical Optical Scanning Systems (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP05709415.3A EP1710613B1 (en) | 2004-01-30 | 2005-01-27 | Polygon mirror and mold for molding polygon mirror |
US11/242,112 US7399094B2 (en) | 2004-01-30 | 2005-09-28 | Polygon mirror and polygon mirror molding die |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004-024337 | 2004-01-30 | ||
JP2004024337A JP4040024B2 (ja) | 2004-01-30 | 2004-01-30 | ポリゴンミラー及びポリゴンミラー成形用金型 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/242,112 Continuation US7399094B2 (en) | 2004-01-30 | 2005-09-28 | Polygon mirror and polygon mirror molding die |
Publications (1)
Publication Number | Publication Date |
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WO2005073780A1 true WO2005073780A1 (ja) | 2005-08-11 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2005/001141 WO2005073780A1 (ja) | 2004-01-30 | 2005-01-27 | ポリゴンミラーおよびポリゴンミラー成形用金型 |
Country Status (4)
Country | Link |
---|---|
US (1) | US7399094B2 (ja) |
EP (1) | EP1710613B1 (ja) |
JP (1) | JP4040024B2 (ja) |
WO (1) | WO2005073780A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2017142066A1 (ja) * | 2016-02-19 | 2017-08-24 | コニカミノルタ株式会社 | 樹脂製の成形品、ミラー及び成形品の製造方法 |
JP2018096871A (ja) * | 2016-12-14 | 2018-06-21 | アイシン精機株式会社 | 測距センサ |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9778457B2 (en) * | 2014-02-12 | 2017-10-03 | Brother Kogyo Kabushiki Kaisha | Light deflector and polygon mirror |
JP6601120B2 (ja) * | 2015-10-05 | 2019-11-06 | ブラザー工業株式会社 | ポリゴンミラー、画像形成装置およびポリゴンミラーの製造方法 |
JP7034820B2 (ja) | 2018-04-24 | 2022-03-14 | キヤノン株式会社 | ポリゴンミラー、偏向器、光走査装置、および画像形成装置 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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JPS63304225A (ja) * | 1987-06-04 | 1988-12-12 | Konica Corp | 回転多面鏡とその製造方法 |
JPH04253021A (ja) * | 1991-01-30 | 1992-09-08 | Minolta Camera Co Ltd | 回転多面鏡とその成形用金型 |
JPH0560995A (ja) * | 1991-01-30 | 1993-03-12 | Minolta Camera Co Ltd | 回転多面鏡とその製造方法 |
US5296959A (en) | 1991-01-30 | 1994-03-22 | Minolta Camera Kabushiki Kaisha | Polygonal mirror, and manufacturing process and mold thereof |
JPH10186116A (ja) | 1996-12-25 | 1998-07-14 | Olympus Optical Co Ltd | ポリゴンミラーとその射出成形方法および射出成形型 |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2619244B2 (ja) | 1987-06-04 | 1997-06-11 | コニカ株式会社 | 回転多面鏡の製造方法 |
JPH08238682A (ja) | 1995-03-06 | 1996-09-17 | Fujitsu Ltd | 回転多面鏡およびその製造方法 |
-
2004
- 2004-01-30 JP JP2004024337A patent/JP4040024B2/ja not_active Expired - Lifetime
-
2005
- 2005-01-27 WO PCT/JP2005/001141 patent/WO2005073780A1/ja not_active Application Discontinuation
- 2005-01-27 EP EP05709415.3A patent/EP1710613B1/en not_active Expired - Fee Related
- 2005-09-28 US US11/242,112 patent/US7399094B2/en not_active Expired - Fee Related
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63304225A (ja) * | 1987-06-04 | 1988-12-12 | Konica Corp | 回転多面鏡とその製造方法 |
JPH04253021A (ja) * | 1991-01-30 | 1992-09-08 | Minolta Camera Co Ltd | 回転多面鏡とその成形用金型 |
JPH0560995A (ja) * | 1991-01-30 | 1993-03-12 | Minolta Camera Co Ltd | 回転多面鏡とその製造方法 |
US5296959A (en) | 1991-01-30 | 1994-03-22 | Minolta Camera Kabushiki Kaisha | Polygonal mirror, and manufacturing process and mold thereof |
JPH10186116A (ja) | 1996-12-25 | 1998-07-14 | Olympus Optical Co Ltd | ポリゴンミラーとその射出成形方法および射出成形型 |
Non-Patent Citations (1)
Title |
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See also references of EP1710613A4 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2017142066A1 (ja) * | 2016-02-19 | 2017-08-24 | コニカミノルタ株式会社 | 樹脂製の成形品、ミラー及び成形品の製造方法 |
JP2018096871A (ja) * | 2016-12-14 | 2018-06-21 | アイシン精機株式会社 | 測距センサ |
Also Published As
Publication number | Publication date |
---|---|
EP1710613B1 (en) | 2013-08-07 |
EP1710613A1 (en) | 2006-10-11 |
EP1710613A4 (en) | 2007-12-19 |
JP2005215516A (ja) | 2005-08-11 |
JP4040024B2 (ja) | 2008-01-30 |
US20060023281A1 (en) | 2006-02-02 |
US7399094B2 (en) | 2008-07-15 |
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