Abstract: The present invention provides a molded article manufacturing method that is simple but does not leave a holding mark on an optical film. By the molded article manufacturing method, the functional surface of an optical film that is not greater than 10 nm in the Ra value of surface roughness is attached to the optical surface forming portion of an injection mold that is not greater than 10 nm in the Ra value of surface roughness, so that the injection mold is made to hold the optical film. A molten resin is supplied into a mold space formed by the injection mold, and the molten resin is hardened to form a molded article body. The molded article body and the optical film are integrated.

Abstract: A wide angle optical lens, an optical lens unit, and an imaging device are small-sized and can secure an attachment space even when space is limited, and can avoid adhesion peeling or the extrusion of an adhesive. Optical lens (10) has a lens frame receiving surface (2a) on the side of first optical surface (S1) having a smaller optical surface diameter than second optical surface (S2), and is further provided with an adhesion space forming surface (3a) on the surrounding side of the lens frame receiving surface (2a). Therefore, it is possible to suppress adhesion peeling even when a smaller size is requested. Furthermore, by securing a larger size for lens frame receiving surface (2a), it is possible to suppress leakage or extrusion of adhesive from lens frame receiving surface (2a) and thus adherence to first optical surface (S1).

Abstract: Technique to provide a molding die which can easily release a minute optical element in a state of favorable surface accuracy, while bending or rupture of a gate portion attached to the optical element is prevented. By making a first outer circumferential transfer surface 21A of a fixed die 20 and a first gate-forming surface 31A flush with each other, a notch shape is not formed on a portion M1 connecting an outer circumferential portion FL on the fixed die 20 side and a gate portion GP. Furthermore, by pushing out the runner portion RP at the same angle as a taper angle ? of a side-surface transfer surface 23A on a second gate-forming surface 32A side, bending deformation or the like of the gate portion GP which can occur when being pushed out to a direction perpendicular to a mold mating surface PL1 can be prevented.

Abstract: A small, high-performance image pickup lens unit having an IR cut filter that can be incorporated reliably therein while avoiding an increase in processing complexity. A sealing portion 14 is disposed between a lens 11 and an IR cut filter 12 in order to seal an internal space IS sandwiched between the lens 11 and the IR cut filter 12, and therefore a holder 40 can be molded integrally with the lens 11 and the IR cut filter 12 incorporated therein while preventing liquid resin MP from flowing in between the lens 11 and the IR cut filter 12. By molding the holder 40 integrally with the lens 11 and the IR cut filter 12 incorporated therein in this manner, an image pickup lens unit 100 can be reduced in size, and reductions in the number of components and the number of assembly man-hours can be achieved.

Abstract: Since the lens (10) includes the alignment portions (14), the lens (10) is positioned with high precision with respect to the second mold (61) during molding of the holder member (40), and the holder member (40) and the lens (10) are positioned with each other with high precision. Further, since the positioning of the lens (10) with respect to the second mold (61) may be performed using the alignment portions (14) provided outside the second optical surface (13e), influence of the heat and pressure produced by the second mold (61) and the resin during molding of the holder member (40) on the second optical surface (13e) of the lens (10) may be reduced. Therefore, occurrence of degradation, such as distortion, in the second optical surface (13e) of the lens (10) during molding of the holder member (40) may be prevented.

Abstract: Technique to provide a molding die which can easily release a minute optical element in a state of favorable surface accuracy, while bending or rupture of a gate portion attached to the optical element is prevented. By making a first outer circumferential transfer surface 21A of a fixed die 20 and a first gate-forming surface 31A flush with each other, a notch shape is not formed on a portion M1 connecting an outer circumferential portion FL on the fixed die 20 side and a gate portion GP. Furthermore, by pushing out the runner portion RP at the same angle as a taper angle ? of a side-surface transfer surface 23A on a second gate-forming surface 32A side, bending deformation or the like of the gate portion GP which can occur when being pushed out to a direction perpendicular to a mold mating surface PL1 can be prevented.

Abstract: A wide angle optical lens, an optical lens unit, and an imaging device are small-sized and can secure an attachment space even when space is limited, and can avoid adhesion peeling or the extrusion of an adhesive. Optical lens (10) has a lens frame receiving surface (2a) on the side of first optical surface (S1) having a smaller optical surface diameter than second optical surface (S2), and is further provided with an adhesion space forming surface (3a) on the surrounding side of the lens frame receiving surface (2a). Therefore, it is possible to suppress adhesion peeling even when a smaller size is requested. Furthermore, by securing a larger size for lens frame receiving surface (2a), it is possible to suppress leakage or extrusion of adhesive from lens frame receiving surface (2a) and thus adherence to first optical surface (S1).

Abstract: Since the lens (10) includes the alignment portions (14), the lens (10) is positioned with high precision with respect to the second mold (61) during molding of the holder member (40), and the holder member (40) and the lens (10) are positioned with each other with high precision. Further, since the positioning of the lens (10) with respect to the second mold (61) may be performed using the alignment portions (14) provided outside the second optical surface (13e), influence of the heat and pressure produced by the second mold (61) and the resin during molding of the holder member (40) on the second optical surface (13e) of the lens (10) may be reduced. Therefore, occurrence of degradation, such as distortion, in the second optical surface (13e) of the lens (10) during molding of the holder member (40) may be prevented.

Abstract: A small, high-performance image pickup lens unit having an IR cut filter that can be incorporated reliably therein while avoiding an increase in processing complexity. A sealing portion 14 is disposed between a lens 11 and an IR cut filter 12 in order to seal an internal space IS sandwiched between the lens 11 and the IR cut filter 12, and therefore a holder 40 can be molded integrally with the lens 11 and the IR cut filter 12 incorporated therein while preventing liquid resin MP from flowing in between the lens 11 and the IR cut filter 12. By molding the holder 40 integrally with the lens 11 and the IR cut filter 12 incorporated therein in this manner, an image pickup lens unit 100 can be reduced in size, and reductions in the number of components and the number of assembly man-hours can be achieved.

Abstract: The present invention provides a manufacturing method for an image pickup lens unit, with which deformation of a lens occurring during molding of a holder can be suppressed. A resin holder member 40 that holds a lens 10 in position in an interior thereof can be formed. At this time, surfaces of first and second lens layers 12 and 13 of the lens 10 may be deformed by molds 51 and 52 such that a depression 12r or the like remains in the first and second lens layers 12 and 13. By subjecting the lens 10 and the holder member 40 to heating treatment, however, this distortion can be released, and as a result, an original optical precision of the first and second optical surfaces 12d and 13e of the lens 10 can be restored.