Optical: systems and elements – Lens – With support
Reexamination Certificate
2002-07-29
2004-07-20
Spector, David N (Department: 2873)
Optical: systems and elements
Lens
With support
C359S718000
Reexamination Certificate
active
06765732
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a pickup lens for an optical disk which is used for reading information from a storage medium, or recording, mainly by using a laser beam, and in particular, to a pickup lens for an extremely small optical disk.
There are various formats (specifications) for information recording media available on the market, and various technologies are employed and studied for the various formats.
In recent years, in particular, a broadband has become popular to create a broadband age, and there are circulating high-volume contents of images, animations and sounds. It is therefore necessary, even for general users, to stock high-volume data.
With respect to a recording medium for data stocking, original ones were those wherein audio cassette tapes were used, and FD (floppy disk) is still used even today. In recent years, Zip (high-volume floppy disk having the measure of capacity of 100 M-200 M), MO (photo-electro-magnetic disk having the measure of capacity of 640 M-2.3 G), CD (optical disk having the measure of capacity of 640-700 M) and DVD (optical disk having the measure of capacity of 4.7 G) are used, which shows that the measure of capacity has grown great.
Among the aforesaid recording media, those utilizing light have their own optical systems.
The optical disks mentioned above have started from the music CD, and therefore, it is always necessary for the DVD which is becoming a leading recording medium now to consider interchangeability with CD, and a size of the DVD is large, which makes it difficult to provide a small-sized equipment, resulting in a problem. To solve this problem, a small-sized medium in a size of 8 cm and a deformed medium having a size of a business card have made an appearance, but it is unavoidable that they have less capacity.
Further, the DVD has a problem that many standards concerning information recording are present and interchangeability between them is insufficient.
With respect to the photo-electro-magnetic disk, problems of interchangeability with standards for low volume and problems that a size of a medium restricts a size of equipment remain unchanged, although the measure of capacity has been made great.
For those problems, there has been proposed a standard concerning a small-sized recording medium which is quite novel.
However, when a medium is small in size, an optical pickup lens and a unit are required to be small in size.
When an optical pickup lens and a unit are made to be small in size, manufacturing, assembling and adjustment of the lens itself become extremely difficult.
SUMMARY OF THE INVENTION
An object of the invention, therefore, is to propose forms which make manufacturing, assembling and adjustment to be easy for an optical pickup lens and an optical pickup unit which are extremely small.
The above object can be attained by the following structures and methods in respective Item.
Item (1-1)
An objective lens used in an optical pickup device that conducts recording and/or reproduction of information for an optical information recording medium, wherein there are provided a lens section which includes a flange section and is almost in a circular form, and a connecting section used as a supporting section for the lens section, the connecting section is provided to be solid with the lens section, and each of them satisfies the following relations;
0.5≦A≦2.0
0.3A≦B≦1.7A
where A represents a diameter (mm) of the lens section viewed in the optical axis direction, and B represents a width (mm) of the connecting section viewed in the optical axis direction.
Item (1-2)
The objective lens according to Item (1-1), wherein a connecting section is provided to be extended from the lens section.
Item (1-3)
The objective lens according to Item (1-2), wherein the objective lens is formed by filling resins through a single inlet in a metal mold.
Item (1-4)
The objective lens described in Item (1-2) or in Item (1-3), wherein the following expression is satisfied.
0.3A≦B≦0.8A
Item (1-5)
The objective lens described in Items (1-2)-(1-4), wherein the connecting section is cut so that nothing may be protruded outside a shape which is roughly circular when viewed in the direction of an optical axis.
Item (1-6)
The objective lens according to Item (1-1), wherein two connecting sections are provided to be extended from the lens section in the direction to face each other.
Item (1-7)
The objective lens according to Item (1-6), wherein the two connecting sections are different from each other.
Item (1-8)
The objective lens according to Item (1-7), wherein the two connecting sections are different from each other in terms of thickness in the optical axis direction.
Item (1-9)
The objective lens according to Item (1-6)-Item (1-8), wherein the two connecting sections are different from each other in terms of thickness in the direction perpendicular to the optical axis.
Item (1-10)
The objective lens according to Item (1-6)-Item (1-9), wherein the two connecting sections are different from each other in terms of a length of the width viewed in the direction of the optical axis.
Item (1-11)
The objective lens according to Item (1-1), wherein a lens section is formed to be arranged at the center of a rectangular connecting section.
Item (1-12)
The objective lens according to Item (1-6)-Item (1-11), wherein the objective lens is formed by filling resins through a single or plural inlets in a metal mold.
Item (1-13)
The objective lens according to Item (1-6)-Item (1-10) or to Item (1-12), wherein two connecting sections are provided to be extended from the lens section in the direction to face each other, and are formed with resins filled through an edge portion of each connecting section.
Item (1-14)
The objective lens according to Item (1-11) or Item (1-12), wherein a lens section is formed to be arranged at the center of a rectangular connecting section, and resins are filled through an edge portion of the connecting section to be formed.
Item (1-15)
The objective lens according to Item (1-12)-Item (1-14), wherein a weld is located outside an optical functional surface of the lens section.
Item (1-16)
The objective lens according to Item (1-1)-Item (1-15), wherein the objective lens is an aspherical lens.
Item (1-17)
The objective lens according to Item (1-1)-Item (1-16), wherein the objective lens is a lens obtained through compression molding.
Item (1-18)
The objective lens according to Item (1-1)-Item (1-16), wherein the objective lens is a lens obtained through injection molding.
Item (1-19)
The objective lens according to Item (1-18), wherein the connecting section serves also as a resin inflow path for the lens section.
Item (1-20)
The objective lens according to Item (1-18)-Item (1-19), wherein the objective lens is a plastic lens.
Item (1-21)
The objective lens according to Item (1-17), wherein the objective lens is a glass lens.
Item (1-22)
The objective lens according to Item (1-1)-Item (1-21), wherein a diffractive Item is formed on the optical functional surface of the objective lens.
Item (1-23)
A manufacturing method for an optical element for forming by filling resins through a plurality of inlets in a metal mold, wherein the time to start injecting resins is staggered when filling resins through the plural inlets.
Inventions relating to a handling method among the present inventions are attained by the following Items.
Item (2-1)
An optical molded component having therein a supporting shaft section having a first cross-sectional area, a connecting section that is provided to be continued in the axial direction of the supporting shaft section and has a cross-sectional area smaller than the first cross-sectional area and an optical functional section provided to be continued from the connecting section, wherein the total weight of the supporting shaft section and the connecting section is greater than the weight of the optical functional section.
Item (2-2)
An optical molded component having therein a supporting shaft section having a first cross-sectional area, a connec
Arai Norikazu
Atarashi Yuichi
Hattori Hiroyuki
Ishida Kazuo
Kurihara Etsuzo
Finnegan Henderson Farabow Garrett & Dunner L.L.P.
Konica Corporation
Spector David N
LandOfFree
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