JP5051601B2 - Manufacturing method of optical element for optical pickup device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for producing an optical element for the optical pickup apparatus formed by injection molding.
[0002]
[Prior art]
As an optical element, for example, there is a plastic lens, which is used in an optical system such as an optical apparatus such as an optical pickup device or a camera. As shown in FIG. 9, the plastic lens is manufactured in a mold formed by a mold 102 having a protruding mechanism 101 for releasing a molded product and a mold 103 having no protruding mechanism. Resin is injected from a runner 102a which is a resin injection flow path of the mold 102, and thereafter, the mold 102 provided with the ejecting mechanism 101 is moved to open the mold, and the ejecting mechanism 101 is operated to operate the outer periphery of the optical function unit 100a. There is a type in which a molded product of the plastic lens 100 having the flange portion 100b is protruded and released.
[0003]
In the manufacture of such a plastic lens, as shown in FIG. 10, since the gate portion 102a1 of the runner 102a is integrally formed with the flange portion 100b, the gate portion 102a1 is cut in the subsequent gate cutting step.
[0004]
[Problems to be solved by the invention]
As described above, the gate portion 102a1 is cut in the gate cutting step, and this cutting may be performed by a nipper, a metal saw, a laser, a milling cutter, or the like, or a combination of these methods. As a result, chipping, burrs, burrs, and the like may occur in the outer peripheral portion of the flange portion 100b.
[0005]
When this plastic lens 100 is stored in a rod-shaped cartridge or tray and sent to the next process, chipping, burrs, burrs, etc. on the outer peripheral part interfere with each other, and the storage is not stable or interferes with other plastic lenses 100. There is a risk of injury.
[0006]
Further, when the plastic lens 100 is attached to an optical device such as an optical pickup device or a camera, chipping, burrs, burrs, etc. generated on the outer peripheral portion are obstructive and adversely affect the reference mounting surface. In some cases, attachment to an optical device or the like becomes unstable.
[0007]
The present invention has been made in view of the above points, and an optical for an optical pickup device that does not impair the storage property and the mounting property even if the outer periphery of the optical element is chipped, burrs, burrs, etc. occur. It aims at providing the manufacturing method of an element.
[0008]
[Means for Solving the Problems]
In order to solve the above problems and achieve the object, the present invention is configured as follows.
[0009]
According to the first aspect of the present invention, “a resin is injected into a mold formed by a mold in which a molded product remains in an opened state and a mold in which the molded product is released in an opened state, and at least a flange portion and In a manufacturing method for manufacturing an optical element for an optical pickup device having an optical function part,
In the corner part of the outer periphery of the flange part where at least the gate part of the molded product is formed, a corner drop is formed,
To release the molded article from the mold, within the scope of dropped the angle viewed in the optical axis direction, of the optical element for the optical pickup device characterized by manufacturing an optical element obtained by cutting the molded article Production method. ].
[0010]
According to the first aspect of the present invention, since the corner drop is formed at the outer periphery of the portion where the gate portion of the optical element molded product is formed, the optical element molded product is separated from the mold. When the molded part of the optical element is cut and the gate part of the optical element is cut, chipping, burrs, burrs, etc. may occur on the outer periphery of the optical element. When it is housed in a rod-shaped cartridge or tray and sent to the next process, chipping, burrs, burrs, etc. in the outer periphery are not obstructed and storage is stable, or other optical elements There is no interference and damage.
[0011]
In addition, when attaching an optical element to an optical device such as an optical pickup device or a camera, chipping, burrs, burrs, etc. do not adversely affect the mounting reference surface, etc., and to an optical device such as an optical pickup device or a camera. Installation is stable.
[0012]
According to a second aspect of the present invention, there is provided: “Manufacturing of an optical element for an optical pickup device according to claim 1, wherein the corner drop is formed in a corner portion on the optical disk side of the outer periphery of the optical element. Method. ].
[0013]
According to the second aspect of the present invention, a corner drop is formed in the corner portion of the optical disk on the outer periphery of the optical element, so that chipping, burrs, burrs, etc. of the outer peripheral part are not obstructed. Storage is stable or does not interfere with other optical elements.
[0014]
According to a third aspect of the present invention, there is provided the optical pickup device according to the first or second aspect, wherein the corner drop is formed in a corner portion on the mounting reference surface side of the outer periphery of the optical element. Of manufacturing optical element for use . ].
[0015]
According to the third aspect of the present invention, a corner drop is formed in the corner portion on the mounting reference surface side of the outer periphery of the optical element, and chipping, burrs, burrs, etc. do not adversely affect the mounting reference surface. In addition, mounting to an optical device such as an optical pickup device or a camera is more stable.
[0016]
The invention according to claim 4, "the angle off the beveled shape or an optical element for the optical pickup device of any serial mounting of claims 1 to 3, characterized in that a curved shape, Production method. ].
[0017]
According to the fourth aspect of the present invention, the corner drop can be formed with a simple mold with a chamfered shape or a curved surface shape. In addition, it is preferable that the corner portion on the optical disk side be chamfered so that the optical element is more stably stored or is not damaged by interference with other optical elements. In addition, it is preferable that the corner portion on the mounting reference surface side of the outer periphery of the optical element has a curved corner shape so that mounting to an optical device such as an optical pickup device or a camera is more stable.
[0018]
According to a fifth aspect of the present invention, there is provided: "The method of manufacturing an optical element for an optical pickup device according to any one of the first to fourth aspects , wherein the cutting is performed on a straight line." ].
The invention according to claim 6 is: “The method of manufacturing an optical element for an optical pickup device according to claim 1, wherein the cutting is performed in a U-shape. ].
According to a seventh aspect of the present invention, there is provided the method for manufacturing an optical element for an optical pickup device according to any one of the first to fourth aspects, wherein the cutting is performed along an outer periphery. ].
[0019]
According to the fifth to seventh aspects of the present invention, even if the outer peripheral portion of the optical element is chipped, burrs, burrs, etc., the chips, burrs, burrs, etc. protrude outside due to corner dropping. And is stable in storage or does not interfere with other optical elements. In addition, the optical element is not chipped due to corner dropping, and burrs, burrs, etc. do not adversely affect the mounting reference surface and the like, and mounting to an optical device such as an optical pickup device or a camera is stable.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of a method for manufacturing an optical element for an optical pickup device according to the present invention will be described with reference to the drawings. However, the present invention is not limited to the embodiments.
[0021]
FIG. 1 is a diagram showing a configuration of a mold, FIG. 2 is a plan view seen from a mold surface side including a protrusion mechanism for releasing a molded product, and FIG. 3 does not have a protrusion mechanism for releasing a molded product. FIG. 4 is a view showing a state in which resin is injected into the mold, FIG. 5 is a view showing mold opening of the mold, and FIG. 6 is a view showing an operating state of the ejection mechanism. 7 is a view showing the cutting of the gate portion, and FIG. 8 is a side view of the plastic lens.
[0022]
The manufacturing apparatus of this embodiment is for manufacturing a plastic lens as an optical element, and includes a mold 11 having a protruding mechanism 10 for releasing a molded product, and a mold 12 having no protruding mechanism, The mold 11 constitutes a mold in which the molded product remains in the mold open state, and the mold 12 constitutes a mold in which the molded product is released in the mold open state. The mold 12 is fixed and the mold 11 moves. The plastic lens 1 as an optical element is injection-molded.
[0023]
As shown in FIG. 8, the plastic lens 1 as the optical element of this embodiment has an optical function part 1a and a flange part 1b on the outer periphery of the optical function part 1a. Corner droppings 1c and 1d are formed at the corners on the outer periphery of the flange portion 1b. The corner drop 1c is formed in a curved surface shape, and the corner drop 1d is formed in a chamfer shape.
[0024]
In this embodiment, the plastic lens 1 has the flange portion 1b on the outer periphery of the optical function portion 1a. However, the plastic lens 1 may not have a flange portion, and is not limited to a circular lens, and may be a plate-like lens. . The optical element is not limited to a plastic lens, and may be a light guide or the like.
[0025]
The mold 11 has a mold surface 11a that forms a flange portion 1b of the plastic lens 1, and a curved surface 11a1 that forms a corner drop 1c of the flange portion 1b is formed on the mold surface 11a. The protrusion mechanism 10 has a mold surface 10 a that forms the optical function portion 1 a of the plastic lens 1. The protruding mechanism 10 may be a mold surface that forms not only the optical function portion 1a but also a part of the inner peripheral side of the flange portion 1b.
[0026]
The mold 12 has a mold surface 12a that forms the optical function portion 1a of the plastic lens 1 and a mold surface 12b that forms the flange portion 1b, and forms a molded product of the plastic lens 1 as at least the optical element of the mold 12. The parts having the mold surfaces 12a and 12b are integrally formed. A chamfered mold surface 12b1 that forms a corner drop 1d of the flange portion 1b is formed on the mold surface 12b that forms the flange portion 1b of the plastic lens 1 of the mold 12.
[0027]
Resin is injected into the mold shown in FIG. 1 formed by the mold 11 having the protruding mechanism 10 and the mold 12 not having the protruding mechanism, and cooled.
[0028]
The injection of the resin is performed from the runner 11b which is a resin injection flow path of the mold 11, and the gate portion 11b1 of the runner 11b is integrally formed with the flange portion 1b.
[0029]
After this cooling, as shown in FIG. 5, the mold 11 provided with the ejecting mechanism 10 is moved to open the mold, and as shown in FIG. 6, the ejecting mechanism 10 is operated to obtain the molded product of the plastic lens 1. Extrude and release.
[0030]
In this way, the resin is injected into the mold formed by the mold 11 having the ejection mechanism 10 for releasing the molded product and the mold 12 not having the ejection mechanism, and as shown in FIGS. Corner drops 1c and 1d are formed at the corners on the outer periphery of the molded product of the plastic lens 1 as an optical element.
[0031]
The corner drop 1 c has a curved surface shape and is formed at a corner portion on the mounting reference surface side of the outer periphery of the plastic lens 1. Further, the corner drop 1 d has a chamfered shape and is formed at a corner portion on the optical disc side on the outer periphery of the plastic lens 1.
[0032]
The gate part 11b1 is cut by the cutting means 20 in the gate cutting step. The cutting means 20 may be performed using a nipper, a metal saw, a laser, a milling cutter, or the like, or may be performed in combination. In the cutting by the cutting means 20, for example, the gate portion 11b1 is first cut, and then the remaining 1c1 of this cut portion is cut together with the flange portion 1b. There are various methods for this cutting, such as a D-cut that cuts linearly, a U-cut that cuts into a U-shape, or an arc-shaped cut that cuts along the outer periphery.
[0033]
Even if the gate portion 11b1 is cut and the outer peripheral portion of the flange portion 1b is chipped and burrs, burrs and the like 11b2 are generated, the corner drops 1c and 1d may be chipped and the burrs and burrs may protrude to the outside. Disappear.
[0034]
In this embodiment, a corner drop 1c is formed in a curved shape at the corner on the mounting reference surface side of the outer periphery of the plastic lens 1, and is guided by the curved corner drop 1c when inserted into a rod-shaped cartridge or tray. Can be stored more smoothly, and can be more smoothly attached to optical devices such as an optical pickup device and a camera. Furthermore, when stored in a rod-shaped cartridge or tray and sent to the next process, chipping, burrs, burrs, etc. on the outer periphery are not obstructed, storage is stable, or interference with other optical elements Will not hurt.
[0035]
Further, a corner drop 1d is formed in a chamfered shape at the optical disc side corner portion of the outer periphery of the plastic lens 1, and can be formed with a simpler mold, and chipping, burrs, burrs, etc. have an adverse effect on the optical disc side. And mounting to an optical apparatus such as an optical pickup device or a camera is more stable.
[0036]
In this embodiment, corner droppings 1c and 1d are formed on the entire outer corner portion of the molded product of the plastic lens 1, but at least on the outer corner portion of the portion where the gate portion 11b1 is formed, and Bayoi by forming the chamfered 1c or chamfered 1d, chamfered 1c or chamfered. 1d, it is not limited to a curved shape or chamfered shape, chipping caused in the outer peripheral portion, burr, burr or the like is protruded to the outside Any shape can be used so long as it does not occur.
[0037]
【Effect of the invention】
As described above, in the invention according to the first aspect, since the corner drop is formed at the outer peripheral corner portion of the molded part of the optical element, the molded article of the optical element from the mold. When the gate part of the molded part of the optical element is cut, chipping, burrs, burrs, etc. may occur on the outer periphery of the optical element. When it is stored in a rod-shaped cartridge or tray and sent to the next process, chipping, burrs, burrs, etc. in the outer peripheral portion do not get in the way, and storage is stable, or other It does not interfere with the optical element and is not damaged.
[0038]
In addition, when attaching an optical element to an optical device such as an optical pickup device or a camera, chipping, burrs, burrs, etc. do not adversely affect the mounting reference surface, etc., and to an optical device such as an optical pickup device or a camera. Installation is stable.
[0039]
According to the second aspect of the present invention, corner dropping is formed in the corner portion of the optical disk on the outer periphery of the optical element, so that chipping of the outer peripheral part, burrs, burrs and the like are not obstructed, and the optical element is stably stored. However, it does not interfere with other optical elements and be damaged.
[0040]
In the invention according to claim 3, the corner portion on the mounting reference surface side of the outer periphery of the optical element is formed with a corner drop, so that chipping, burrs, burrs, etc. do not adversely affect the mounting reference surface, etc. Attachment to optical devices such as devices and cameras is more stable.
[0041]
In the invention according to the fourth aspect, the corner drop can be formed with a simple mold with a chamfered shape or a curved surface shape. In addition, it is preferable that the corner portion on the optical disk side be chamfered so that the optical element is more stably stored or is not damaged by interference with other optical elements. In addition, it is preferable that the corner portion on the mounting reference surface side of the outer periphery of the optical element has a curved corner shape so that mounting to an optical device such as an optical pickup device or a camera is more stable.
[0042]
In the inventions according to claims 5 to 7 , even if chips, burrs, burrs, etc. occur on the outer peripheral portion of the optical element, the chips, burrs, burrs, etc. do not protrude to the outside due to corner dropping. , Storage stability or interference with other optical elements and no damage. In addition, the optical element is not chipped due to corner dropping, and burrs, burrs, etc. do not adversely affect the mounting reference surface and the like, and mounting to an optical device such as an optical pickup device or a camera is stable.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of a mold.
FIG. 2 is a plan view seen from a mold surface side of a mold having an ejection mechanism for releasing a molded product.
FIG. 3 is a plan view seen from the mold surface side of a mold that does not have a protruding mechanism for releasing a molded product.
FIG. 4 is a view showing a state in which a resin is injected into a mold.
FIG. 5 is a diagram showing mold opening of a mold.
FIG. 6 is a diagram showing an operating state of the ejecting mechanism.
FIG. 7 is a diagram showing cutting of a gate portion.
FIG. 8 is a side view of a plastic lens.
FIG. 9 is a diagram showing a configuration of a conventional plastic lens and a mold.
FIG. 10 is a diagram showing the conventional cutting of the gate portion.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Plastic lens 1a Optical function part 1b Flange part 1c, 1d Corner drop 10 Extrusion mechanism 11,12 Mold 11b1 Gate part

Claims (7)

Resin is injected into a mold formed by a mold in which a molded product remains in an opened state and a mold from which the molded product is released in an opened state, and is used for an optical pickup device having at least a flange portion and an optical function portion. In a manufacturing method for manufacturing an optical element,
In the corner part of the outer periphery of the flange part where at least the gate part of the molded product is formed, a corner drop is formed,
To release the molded article from the mold, within the scope of dropped the angle viewed in the optical axis direction, of the optical element for the optical pickup device characterized by manufacturing an optical element obtained by cutting the molded article Production method.   2. The method of manufacturing an optical element for an optical pickup device according to claim 1, wherein the corner drop is formed in a corner portion on the optical disk side of the outer periphery of the optical element.   The method of manufacturing an optical element for an optical pickup device according to claim 1, wherein the corner drop is formed in a corner portion on an attachment reference surface side on an outer periphery of the optical element.   4. The method of manufacturing an optical element for an optical pickup device according to claim 1, wherein the corner drop is a chamfered shape or a curved shape.   5. The method of manufacturing an optical element for an optical pickup device according to claim 1, wherein the cutting is performed on a straight line.   The method of manufacturing an optical element for an optical pickup device according to any one of claims 1 to 4, wherein the cutting is performed in a U-shape.   5. The method of manufacturing an optical element for an optical pickup device according to claim 1, wherein the cutting is performed along an outer periphery.

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