Optical: systems and elements – Lens – With support
Reexamination Certificate
2000-06-06
2001-12-11
Epps, Georgia (Department: 2873)
Optical: systems and elements
Lens
With support
C359S814000, C359S824000
Reexamination Certificate
active
06330119
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to an optical pickup device provided with a drive mechanism for driving a lens holder in a tracking direction and a focusing direction using magnetic forces. In particular, it relates to a method for fixing a drive coil used to generate the magnetic forces to the lens holder.
2. Description of the Related Art
Optical pickup devices used for reproduction information from CDs, DVDs and other optical recording media are provided with an objective lens drive device which is used to converge laser light to a target position on the recording surface of the optical recording medium. The objective lens drive device can drive the objective lens in a focusing direction and a tracking direction. Such objective lens drive devices include well-known magnetic type drive devices which use permanent magnets and drive coils. The drive coils are generally attached to the side of the lens holder that retains the objective lens. In addition to direct winding, a bonding agent can be used to fix the drive coils to the lens holder. Ultraviolet light curing type bonding agents and epoxy group resin bonding agents are typically used.
Ultraviolet light curing type bonding agents are typically cured by using ultraviolet irradiation for approximately 30 seconds. However, when such bonding agents are used, the surface of the lens holder often remains sticky after curing. As the lens holder moves, the sticky bonding agent can cause the lens holder to stick to other parts and impeding the normal driving process.
On the other hand, while epoxy group resin bonding agents do not stick to the surface after curing, the curing process takes a longer time and the unit must usually be set aside in an environment of 100° C. for approximately 30 minutes. As a result, during the time the epoxy is cured, the drive coils must be pressed by a jig to a position where they are attached to the lens holder. Often the drive coils must be temporarily bonded to the lens holder using an instant or other type of bonding agent until the curing process takes place. Thus, the bonding and fixing method using an epoxy group resin bonding agent is complex and time-consuming.
SUMMARY OF THE INVENTION
Accordingly, the present invention is directed to a manufacturing method for an optical pickup device including bonding and fixing drive coils to a lens holder that substantially obviates one or more of the problems due to limitations and disadvantages of the related art.
It is an object of the present invention to provide a manufacturing method for an optical pickup device whereby drive coils can be bonded and fixed to a lens holder by using simple operations without using an ultraviolet light curing type bonding agent.
It is another object of the present invention to provide a method for manufacturing the optical pickup device which uses simple operations to bond and fix drive coils to a lens holder even when an epoxy group resin bonding agent is required.
Additional features and advantages of the invention will be set forth in the descriptions that follow and in part will be apparent from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
To achieve these and other advantages and in accordance with the purpose of the present invention, as embodied and broadly described, the present invention provides a method for manufacturing an optical pickup device having a lens holder and a magnetic drive device for driving the lens holder, the magnetic drive device having a permanent magnet and drive coils fixed to the lens holder, the method including providing a fuse wire having a wire and a fuse coating covering the wire, the fuse coating having a predetermined melting temperature, pressing the fuse wire on the lens holder at a predetermined position, energizing the fuse wire in the pressed position to melt the fuse coating, and curing the melt fuse coating to bond and fix the fuse wire to the lens holder to form the drive coils.
Another method for manufacturing the optical pickup device according to the present invention includes providing a fuse wire having a wire and a fuse coating covering the wire, the fuse coating having a predetermined melting temperature, energizing the wire to melt the fuse coating, subsequently pressing the fused wire to the lens holder at a predetermined position, and curing the melt fuse coating to bond and fix the fuse wire to the lens holder to form the drive coils.
Yet another method for manufacturing the optical pickup device according to the present invention includes pressing a wire on the lens holder at a predetermined position with a fuse film having a predetermined melting temperature interposed between the wire and the lens holder, energizing the wire in the pressed position to melt the fuse film, and curing the melt fuse film by stopping the energizing process to bond and fix the wire to the lens holder to form the drive coils.
In another aspect, the present invention provides an optical pickup device having a lens holder for holding an objective lens and a magnetic drive device for driving the lens holder in a tracking direction and a focusing direction, the magnetic drive device having a permanent magnet and drive coils fixed to the lens holder, wherein the coils comprise a wire bonded and fixed to the lens holder by a thermal fusing material having a predetermined melting temperature.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed.
REFERENCES:
patent: 5999342 (1999-12-01), Okada et al.
Isobe Hisao
Kasahara Satoshi
Epps Georgia
Hogan & Hartson L.L.P.
Sankyo Seiki Mfg. Co. Ltd.
Seyrafi Saeed
LandOfFree
Manufacturing method for optical pickup device does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Manufacturing method for optical pickup device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Manufacturing method for optical pickup device will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2571472