Optical: systems and elements – Lens – With support
Reexamination Certificate
2001-09-12
2003-02-11
Epps, Georgia (Department: 2873)
Optical: systems and elements
Lens
With support
C359S814000
Reexamination Certificate
active
06519100
ABSTRACT:
TECHNICAL FIELD
This invention relates to an optical pick-up device, and more particularly to an optical pick-up device used for irradiating light beams onto an optical disc caused to undergo rotational operation to carry out recording of information signals onto the optical disc, or to carry out reproduction of information signals recorded on the optical disc.
BACKGROUND ART
Hitherto, optical pick-up devices used for carrying out recording of information signals with respect to an optical disc, or for reproducing information signals recorded on the optical disc includes an object lens (objective) for converging light beams emitted from light source to irradiate them onto signal recording surface of the optical disc, and is further provided with a movable portion for allowing the object lens to undergo drive displacement in a focusing direction in parallel to the optical axis thereof and in a tracking direction of plane direction perpendicular to the optical axis, and a fixing portion for supporting this movable portion. The movable portion includes drive coils, i.e., focusing coil and tracking coil.
In this case, in order to allow the object lens to undergo drive displacement in the focusing direction and in the tracking direction so that light beams focus on the signal recording surface of the optical disc to follow recording tracks, it is necessary to deliver, from the external, drive currents corresponding to focusing error signal and tracking error signal to the drive coils constituting the movable portion.
As the optical pick-up device adapted for delivering current from the outside of the device to the drive coils of the movable portion, there are optical pick-up devices as shown below.
An optical pick-up device
101
shown in
FIGS. 1 and 2
comprises a movable portion
107
in which printed wiring boards for connection
106
,
106
are attached at a lens holder
105
which has held an object lens
102
, a focusing coil
103
and tracking coils
104
,
104
. This movable portion
107
is supported so that it is permitted to undergo displacement in a direction in parallel to the optical axis of the object lens
102
and in a plane direction perpendicular to the optical axis through four suspensions
110
having bottom end portions supported by a fixing portion
108
and connected to a printed wiring board
109
for external connection supported at the fixing portion
108
. By soldering front end portions of the four suspensions
110
which have displaceably supported the movable portion
107
and end portions of the focusing coil
103
and the tracking coils
104
with respect to the printed wiring boards for connection
106
,
106
, supporting with respect to the fixing portion
108
of the movable portion
107
and electrical conduction to the outside of the device of the respective coils
103
,
104
,
104
are realized.
Moreover, in an optical pick-up device
201
shown in
FIGS. 3 and 4
, there are provided in a projected manner (hereinafter simply referred to as projected as occasion may demand) plural coil binding projections
206
at a lens holder
205
which has held an object lens
202
, a focusing coil
203
and plural tracking coils
204
to constitute a movable portion
207
to bind end portions of the respective coils
203
and
204
with respect to predetermined coil binding projections
206
to solder thereat front end portions of four suspensions
210
having bottom end portions supported by a fixing portion
208
and connected to a printed wiring board
209
for external connection supported by the fixing portion
208
to realize supporting with respect to the fixing portion
208
of the movable portion
207
and electric conduction to the device outside of the respective coils
203
,
204
.
Meanwhile, in the optical pick-up device
101
shown in
FIGS. 1 and 2
, it is necessary to provide printed boards
106
for connection. As a result, the number of parts is increased. Further, space for providing the connection printed boards
106
is required. Thus, not only weight of the device itself is increased, but also the device itself becomes large sized. Further, since the connection printed board
106
is attached at the lens holder
105
by, e.g., adhesive agent, there results lowered responsibility resulting from change with passage of time of adhesive agent. In addition, there occurs increase in the number of assembling steps. This might also give the cause to increase production cost.
Further, the optical pick-up device
201
shown in
FIGS. 3 and 4
requires projections like coil binding projections
206
at the lens holder
205
. Thus, miniaturization is prevented as the result of the fact that such projections are provided. In addition, working for binding end portions of the coils
203
,
204
at the coil binding projections
206
is required. These results the increased number of assembling steps. This also constitute the cause that the manufacturing cost is increased.
An object of this invention is to provide a novel optical pick-up device which can solve the technical problems that the conventional optical pick-up devices have.
Another object of this invention is to provide an optical pick-up device which can reduce the number of parts, and realize light weight and miniaturization.
In the optical pick-up device according to this invention proposed in order to attain such objects, a movable portion in which drive coil is provided at a lens holder of synthetic resin for holding an object lens is supported at a fixing portion having magnet opposite to the drive coil through suspensions doubling as electric current supply medium from external circuit. Further, conductive portions formed by the resin plating method are provided at the lens holder to solder end portion of the drive coil and one ends of the suspensions to the conductive portions to realize supporting with respect to the fixing portion of the movable portion and electric connection with respect to an external circuit of the drive coil.
In accordance with this optical pick-up device, the end portion of the drive coil and one ends of suspensions are soldered to the conductive portion integrally provided at the lens holder so that supporting with respect to the fixing portion of the movable portion and electric connection with respect to the external circuit of the drive coil are realized. Accordingly, the number of parts is reduced and miniaturization of the device itself is realized. In addition, since reduction in the number of parts is realized, the number of assembling steps is reduced. Thus, reduction in the manufacturing cost can be realized.
REFERENCES:
patent: 5627687 (1997-05-01), Fujisawa
patent: 5636068 (1997-06-01), Tanaka
patent: 5903539 (1999-05-01), Tanaka
patent: 5926327 (1999-07-01), Bae
patent: 6317277 (2001-11-01), Izumino et al.
patent: 6377407 (2002-04-01), Susukii et al.
patent: 6-96469 (1994-04-01), None
patent: 9-282687 (1997-10-01), None
patent: 11-232679 (1999-08-01), None
patent: 2000-149293 (2000-05-01), None
Epps Georgia
Kananen, Esq. Ronald P.
Rader & Fishman & Grauer, PLLC
Seyrafi Saeed
Sony Corporation
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