Patent Application
20130081524
1. Technical Field
The present disclosure relates to molds and, particularly, to a method for manufacturing a high quality lens molding core.
2. Description of Related Art
Lens molding cores are manufactured by cutting. However, the roughness of the manufactured lens molding cores is high, and the manufactured lens molding cores have a number of circular micro-sized residues. The residues cooperatively form a diffractive grating have a spatial cycle equal to the pitch, which will be transferred to a lens molded by the lens molding core and produce a rainbow flare in images captured by the lens.
Therefore, it is desirable to provide a method for manufacturing a lens molding core, which can overcome the above-mentioned problems.
Many aspects of the present disclosure can be better understood with reference to the following drawings. The components in the drawings are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the present disclosure. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the views.
Embodiments of the present disclosure will now be described in detail with reference to the drawings.
Referring to
In step 100, a blade 20 is provided.
The lens molding core 10 includes a molding surface 101 for molding a lens (not shown) and a central axis 12. The blade 20 points to the molding surface 101, and is used for cutting the molding surface 101.
The blade 20 is held by a first driver 40. The first driver 40 includes a first platform 41, a height adjuster 42, a first holder 43, and a first controller 44. The height adjuster 42 is positioned on the first platform 41. The first holder 43 is positioned on the height adjuster 42 and configured for holding the blade 20 in such a way that the blade 20 points to the molding surface 101 along a direction that is parallel to the central axis 12. The first controller 44 is configured for controlling the height adjuster 42 to adjust a height of the blade 20, according to the manufacturing parameters of the lens molding core 10. In this embodiment, the height adjuster 42 is a linear motor.
The lens molding core 10 is held and driven by a second driver 30. The second driver 30 includes a second platform 31 positioned adjacent to the first platform 41, a linear motor 32, a rotary motor 33, a second holder 34, and a second controller 35. The linear motor 32 includes a stator 321 positioned on the second platform 31 and a slider 322 movably riding on the stator 321. The linear motor 32 drives the slider 322 to slidably move on the stator 321. The rotary motor 33 includes a main body 331 connected to the slider 322 and a rotor 332 rotatably extending from the main body 331 along a direction that is substantially parallel to the sliding direction of the slider 322. The main body 331 drives the rotor 332 to spin about an axis (not shown), which is parallel to the extending direction, relative to the main body 331. The second holder 34 is connected to the rotor 332 and holds the lens molding core 10 in a manner that the central axis 12 passes through the axis about which the rotor 332 spins. The second controller 35 controls the linear motor 32 and the rotary motor 33, according to manufacturing parameters of the lens molding core 10.
In step 200, the lens molding core 10 and the blade 20 are set to respective origins, where the blade 20 points to the molding surface 101 exactly along the central axis 12.
In step 300, the blade 20 is adjusted to point to a cutting point on the molding surface 101 by the first driver 40. In this embodiment, the blade 20 is adjusted to a proper height by the height adjuster 42.
In step 400, the lens molding core 10 is driven to move toward the blade 20 along a direction that is substantially parallel to the central axis 12 and to spin about the central axis 12 until the blade 20 cuts into the molding surface 101 a desired depth, according to manufacturing parameters of the lens molding core 10. In this embodiment, the moving speed of the lens molding core 10 is 0.5 millimeter per minute (mm/min), the desired depth is 1 micrometer (μm), the rotating speed of the rotary motor 33 is 1200 revolutions per minute (r.p.m).
In step 500, the lens molding core 10 is moved back to its origin and the blade 20 moves out of the lens molding core 10.
In other words, the blade 20 is driven to a number of cutting points in this order from the peripheral to the center of the molding surface 101 by the first driver 40 at a fixed pitch less than about 500 nm, according to the manufacturing parameters of the lens molding core 10, in step 300, and, the lens molding core 10 is driven to move toward the blade 20 along a direction that is substantially parallel to the central axis and to spin about the central axis at each cutting point until the blade 20 cuts into the molding surface 101 a desired depth, according to the manufacturing parameters of the lens molding core 10, in step 400.
The fixed pitch d is larger than or equal to the precision value of the first driver 40, and is less than or equal to about 3 μm. In this embodiment, the precision value of the second driver 40 is 0.05 μm.
It is proved by numerous experiments that the d is smaller, the roughness of the molding surface 101 is smaller, that is, the d is smaller, the molding surface 101 is smoother.
It will be understood that the above particular embodiments are shown and described by way of illustration only. The principles and the features of the present disclosure may be employed in various and numerous embodiment thereof without departing from the scope of the disclosure as claimed. The above-described embodiments illustrate the possible scope of the disclosure but do not restrict the scope of the disclosure.
| Number | Date | Country | Kind |
|---|---|---|---|
| 100135394 | Sep 2011 | TW | national |
