1. Field of the Invention
The present invention relates to an optical pickup device mounted to an optical disk drive, in details, relates to an optical pickup device having a lens unit in which a movable lens holder having an object lens is supported by a wire member having elasticity extended from a fixed support member displaceably in a cantilever state.
2. Description of the Related Art
An optical pickup device mounted to an optical disk drive is used for writing or reading data by converging laser light to a disk face as a record medium and is provided with a function of controlling a position of an object lens in a focus direction or in a tracking direction in accordance with face swinging or eccentricity in rotating a disk.
In the lens unit 1 of
As is known from
Meanwhile, it is publicly known to use a gel-like substance of a self holding type, or a gel-like substance of a photo-curing type or a thermosetting type in order to restrain resonance by damping a biaxial actuator of an object lens drive apparatus (refer to, for example, JP-A-2000-222753). Further, it is also publicly known in an object lens drive apparatus to penetrate a suspension for supporting an object lens holder through a filling portion provided to a suspension holder, injecting a damper member comprising a UV curing type viscoelastic member to the filling portion and forming the above-described filling portion by a filling portion an upper face of which is opened or a filling portion opened in a front and rear direction (refer to, for example, JP-A-10-106000). Further, it is also publicly known in a structure of supporting an object lens for an optical pickup device to penetrate a wire suspended with the object lens through a recess portion of a damper holder and filling a damper member to a surrounding thereof as well as providing a slit having a narrow width at the recess portion over a total length thereof and injecting the damper member to the recess portion by utilizing the slit (refer to, for example, JP-A-11-096572).
According to the background art explained in reference to
In this regard, according to a technology described in JP-A-11-096572, that is, a technology of providing the slit having the narrow width over the total length of the recess portion of the damper holder inserted with the wire suspended with the object lens and filled with the damper member over the total length, by determining the up and down width of the slit to be narrower than the up and down width of the recess portion, non-uniformity of the shape in the up and down direction of the layer surface of the damper member is restrained and therefore, it is predicted that the amount of filling the damper member is made to be uniform at the recess portion only in this respect. However, since the front and rear width of the slit becomes the width the same as that of the front and rear width of the recess portion and therefore, it can be said that non-uniformity of a shape in the front and rear direction of the layer surface of the damper member is not restrained and the layer surface is molded in the wavy shape in the front and rear direction to cause to increase a dispersion in the filling amount. Further, it is known that the characteristic of displacing the object lens is deteriorated and the reading and writing function by the optical pickup device is deteriorated also by the dispersion in the filling amount caused by molding the layer surface of the damper member in the wavy shape in the front and rear direction. Further, it is also known that by forming the front and rear width of the slit by the width the same as that of the front and rear width of the recess portion, when the damper member is injected to one point (one portion) in the front and rear direction of the slit, there is a concern of bringing about a drawback of leaking out the damper member injected to the recess portion from other portion of the slit.
The present invention has been carried out in view of the above-descried situation and one of objects thereof is to provide an optical pickup device having a lens unit in which on the basis of the constitution explained in reference to
According to a first aspect of the invention, there is provided an optical pickup device including: a fixed support member having a filling portion in which a damper member is filled; a movable lens holder having an object lens; and a wire member having an elasticity and being fixed to the fixed member at one end thereof and being fixed to the movable lens holder at the other end thereof, wherein the wire member is arranged to penetrate through the damper member filled in the filling portion, wherein the filling portion is formed by a groove-like face formed at a side face of the fixed support member disposed in a left and right direction thereof and extended over a total width in a front and rear direction of the fixed support member and an inner face of a lid portion closing an opening portion of a groove shaped hollow portion surrounded by the groove-like face, wherein the lid portion has a damper member filling port a width of which is formed to be narrower than a front and rear width of the groove shaped hollow portion, wherein an up and down width of the damper member filling port is configured to be narrower than an up and down width of the groove shaped hollow portion, and wherein the groove-like face is formed in a channel-like shape or substantially in a channel-like shape in a front view by an upper face, a lower face and a groove bottom face and the lid portion is integrally formed with the fixed support member.
According to a second aspect of the invention, there is provided an optical pickup device including: a fixed support member having a filling portion in which a damper member is filled; a movable lens holder having an object lens; and a wire member having an elasticity and being fixed to the fixed member at one end thereof and being fixed to the movable lens holder at the other end thereof, wherein the wire member is arranged to penetrate through the damper member filled in the filling portion, wherein the filling portion is formed by a groove-like face formed at a side face of the fixed support member disposed in a left and right direction thereof and extended over a total width in a front and rear direction of the fixed support member and an inner face of a lid portion closing an opening portion of a groove shaped hollow portion surrounded by the groove-like face, and wherein the lid portion has a damper member filling port a width of which is formed to be narrower than a front and rear width of the groove shaped hollow portion.
The above objects and advantages of the present invention will become more apparent by describing preferred exemplary embodiments thereof in detail with reference to the accompanying drawings, wherein:
Now referring to the attached drawings as the occasion demands, an explanation will be given of a best mode for carrying out the invention.
A point of differing the lens unit 1 of
According to the embodiment, the filling portion 7 formed by each of the both side faces of the fixed support member 2 disposed in the left and right direction is formed by the groove-like face 71 extended over the total width in the front and rear direction of the fixed support member 2 shown in
As is known in reference to
According to the embodiment, each of the filling portions 7 is opened at the side face of the fixed support member 2 only at the portion of forming the damper member filling port 22, further, the front and rear width c and the up and down width d of the damper member filling port 22 are formed to be narrower than the front and rear width a and the up and down width b of the groove shaped hollow portion forming the filling portion 7 and therefore, a size of the damper member filling port 22 is small. Therefore, when the damper member 8 is filled from the damper member filling port 22, the concern of molding the layer surface 81 of the damper member 8 in the wavy shape in the front and rear direction and forming the layer surface 81 in the recessed shape or the bulged shape in the up and down direction is extremely reduced and not only the amounts of filling the damper member 8 to the individual filling portions 7 become uniform but also in filling, there is not a concern of leaking out the damper member 8 from the damper member filling port 22.
Although according to the embodiment, the damper member filling port 22 is formed in a rectangular shape or a square shape, in this respect, the damper member filling port 22 may be formed in a circular shape. Further, when the damper member filling port 22 is formed as upper as possible within the range of communicating with the groove shaped hollow portion, there is achieved an advantage that the damper member 8 filled from the damper member filling port 22 is easy to distribute uniformly to the total of the filling portion 7.
According to the embodiment, the filling portion filled with the damper member is opened at the side face of the fixed support member only at a portion of forming the damper member filling port, further, the damper member filling port is formed to be narrower than the front and rear width of the groove shaped hollow portion forming the filling portion and therefore, when the damper member is filled from the damper member filling port, a concern of forming a layer surface of the damper member in a wavy shape in the front and rear direction is extremely reduced. Therefore, amounts of filling the damper member to the individual filling portions become uniform. Further, since the width of the damper member filling port is narrow, in filling, there is not a concern of leaking out the damper member from a portion of filling the damper member or a portion at a vicinity thereof. Further, in a lens unit of a general optical pickup device, the up and down width of the filling portion provided to the fixed support member is very short and therefore, even when the layer surface of the damper member is molded in the recessed shape or the bulged shape in the up and down direction at the location of the filling port, it is difficult to bring about a situation that amounts of filling the damper member to the individual filling portions are significantly dispersed thereby.
In the embodiment, it is preferable that the up and down width of the damper member filling port becomes narrower than the up and down width of the groove shaped hollow portion, according thereto, even when the layer surface of the damper member is molded in the recessed shape or the bulged shape in the up and down direction at the location of the filling port having the narrow front and rear width, there is not brought about the situation in which the amounts of filling the damper member to the individual filling portions are significantly dispersed thereby.
In the embodiment, it is preferable to form the groove-like face in a channel-like shape or substantially in a channel-like shape in a front view by an upper face, a lower face and a groove bottom face and form the lid portion integrally with the fixed support member. According thereto, it is not necessary to constitute the lid portion by a separate part and therefore, the amounts of filling the damper member to the individual filling portions can be made to be uniform without increasing a number of parts.
According to the embodiment, the amounts of filling the damper member to the individual filling portions can be made to be uniform by constituting a basic constitution by the constitution explained in reference to
Although the present invention has been shown and described with reference to specific preferred embodiments, various changes and modifications will be apparent to those skilled in the art from the teachings herein. Such changes and modifications as are obvious are deemed to come within the spirit, scope and contemplation of the invention as defined in the appended claims.
Number | Date | Country | Kind |
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P2004-060933 | Mar 2004 | JP | national |