(19) Japanese Patent Office (JP)
`11 Unexamined Patent Application (Kokai)
`(12) Unexamined Patent Gazette (A)
`H4-113524
`(43) Publication Date: April 15, 1992
`ID Symbol
`JPO File Number
`D
`2106-5D
`Request for Examination: Not Requested Number of Claims: 2 (Total of 6 pages)
`
`(51) Int. Cl.5
`G 11 B 7/09
`
`(54) Title of the Invention: Support for lens driving
`(21) Application Number: Patent Application H2-231556
`(22) Filing Date:
` August 31, 1990
`(72) Inventor:
`c/o Sharp Corporation, 22-22 Nagaike-cho, Abeno-ku, Osaka-shi, Osaka-fu
`Hiroshi Ogata
`(71) Applicant:
`22-22 Nagaike-cho, Abeno-ku, Osaka-shi, Osaka-fu
`Sharp Corporation
`(74) Agent:
`Patent Attorney Kenzo Hara
`
`Specification
`
`Title of the Invention
`1.
`Lens drive support
`2.
`Claims
`1.
`A lens drive support, equipped with an objective lens holder having an objective lens that focuses a light
`beam on an optical recording medium, and focus coils that drive the objective lens in the optical axis direction of the
`light beam, in which the objective lens holder is held via a relay board provided on the objective lens holder;
`wherein the focus coils are divided and arranged in the optical axis direction, and a protruding member for fixating
`the relay board is provided between each focus coil.
`2.
`A lens drive support, equipped with an objective lens holder having an objective lens that focuses a light
`beam onto an optical recording medium, focus coils that drive the objective lens in the optical axis direction of the
`light beam, and a radial coil that drives the objective lens in a direction perpendicular to the optical axis;
`wherein the focus coils are divided and arranged in the optical axis direction, and an upright member for fixing the
`radial coil is provided between each focus coil.
`3.
`Detailed Description of the Invention
`(Industrial Field of Application)
`The present invention relates to a lens drive support for supporting an objective lens used in an optical pickup device
`used for recording and reproducing information on an information recording medium such as an optical disk.
`(Prior Art)
`Conventionally, in optical pickup devices, in order to control the condensing position of the light beam irradiated onto
`an information recording medium such as an optical disk through an objective lens in a focus direction and a radial
`direction, a lens drive support is used to drive the objective lens in two axes.
`For example, as shown in FIG. 5, such a lens drive support 51 is equipped with a holder 53 having a substantially
`rectangular parallelepiped shape;
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`a substantially cylindrical objective lens 52 is provided approximately at the center of the holder 53, and a pair of
`recesses 63, 63 are provided at both ends of the holder 53 in the longitudinal direction, approximately symmetrically
`with respect to the objective lens 52.
`On the other hand, a focus drive coil 60 is wound around the outer peripheral surface of the holder 53 so as to be
`coaxial with the objective lens 52, and further, a pair of annularly wound radial drive coils 62 are arranged and fixated
`to the outer peripheral surface of each of the focus drive coils 60 facing the recesses 63, respectively.
`In addition, one surface of substantially rectangular parallelepiped-shaped relay boards 59 and 59 is fixated to both
`longitudinal wings of the holder 53 around which the focus drive coil 60 is wound, and each of the relay boards 59 is
`set so that one axis of symmetry thereof and the axis of symmetry of the objective lens 52 are on the same plane.
`On the other hand, on both end surfaces of each relay board 59, 59 in the optical axis direction of the objective lens
`52, which is the vertical direction in the figure, one end of each of a pair of opposing elastic bodies 54, which are
`movable in the focus direction, each shaped like a plate spring, is attached. These pairs of focus direction movable
`elastic bodies 54 are arranged in parallel so that their elongated directions are perpendicular to the radial direction
`indicated by arrow A in the figure, and each other end is attached parallel to both ends of an intermediate support 55
`having a substantially rectangular parallelepiped shape.
`Moreover, one end of a radially movable elastic body 56 in the form of a leaf spring is similarly attached to both end
`side surfaces of the intermediate support 55. A total of two radially movable elastic bodies 56 , 56 have their legs
`spread apart, and their other ends are attached to respective support members 58 , 58 erected on the surface of the
`fixated support 57 .
`Then, on the surface of the fixated support 57, substantially rectangular parallelepiped-shaped magnets 61, 61, which
`are inserted into the respective recesses 63, 63, are erected, respectively, and furthermore, substantially rectangular
`parallelepiped-shaped magnets 64, 64 are erected at the same positions with the focus drive coil 60 therebetween.
`Thus, in the above configuration, by the driving force of each drive coil 60, 62... and each magnet 61, 61, 64, 64, and
`each movable elastic body 54, 56, the objective lens 52 is biaxially driven in the focus direction and the radial direction
`while keeping the optical axis of the objective lens 52 perpendicular to the rotating surface of an information recording
`medium such as an optical disk (not shown).
`(Problem to be Solved by the Invention)
`However, in the above configuration, since each relay board 59 is directly fixated to the outer peripheral surface of
`the focus drive coil 60, it has the following three drawbacks.
`(1) It is difficult to position the relay board 59. (2) Tools are required for accurate positioning. (3) Since the focus
`drive coil 60 and the relay board 59 are fixated by adhesive, the state of the bonding surface may change depending
`on how the focus drive coil 60 is wound, and the bond strength between them is not constant.
`Further, the same drawbacks as described above occur in the bonding and fixing of the focus drive coil 60 and each
`radial drive coil 62…
`Therefore, it takes time to accurately and reliably fix each relay board 59 and each radial drive coil 62 to the focus
`drive coil 60, creating a problem wherein it is difficult to improve the productivity of the lens drive support. .
`(Means of Solving the Problem)
`Therefore, the lens drive support according to claim 1 of the present invention is characterized by being equipped with
`an objective lens holder having an objective lens that focuses a light beam on an optical recording medium, and focus
`coils that drive the objective lens in the optical axis direction of the light beam, in which the objective lens holder is
`held via a relay board provided on the objective lens holder; wherein the focus coils are divided and arranged in the
`optical axis direction, and a protruding member for fixating the relay board is provided between each focus coil.
`Further, the lens drive support according to claim 2 of the present invention is characterized by being equipped with
`an objective lens holder having an objective lens that focuses a light beam onto an optical recording medium, a focus
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`H4-113524 (3)
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`coil that drives the objective lens in the optical axis direction of the light beam, and a radial coil that drives the objective
`lens in a direction perpendicular to the optical axis; wherein the focus coils are divided and arranged in the optical
`axis direction, and an upright member for fixing the radial coil is provided between each focus coil.
`(Action)
`According to the configurations of claims 1 and 2 above, when fixing the relay board and the radial coil, both of them
`can be easily and accurately positioned by using the protruding member and the standing member, respectively,
`without using any tools for positioning. Furthermore, since one of the fixing surfaces can be made constant instead of
`the conventional focusing coil surface which is not constant, the fixing strength can also be made more constant. As a
`result, it is possible to improve the productivity of the lens drive support.
`(Embodiment)
`An embodiment of the lens drive support according to the present invention will be described below with reference to
`FIGS. 1 to 4.
`As shown in FIG. 3, the lens drive support is equipped with a substantially rectangular substrate 14. A substantially
`cylindrical opening 14a through which a light beam passes through an objective lens 16, which will be described later,
`is provided in the substantially central portion of the substrate 14. Further, a pair of substantially rectangular
`parallelepiped-shaped magnets 15 are erected on the substrate 14 so as to face each other in the longitudinal direction
`of the substrate 14 with the opening 14a therebetween; moreover, magnets 17, 17 facing each other at a predetermined
`distance radially outward in the opening 14a are respectively erected with respect to the respective magnets 15, 15,
`and a magnetic field is created between each magnet 15 and magnet 17.
`On the other hand, as shown in FIG. 1, a substantially rectangular parallelepiped-shaped drum (objective lens holder)
`1 is provided with a substantially cylindrical objective lens mounting portion 1a that holds the objective lens (not
`shown) at approximately the center thereof, and a pair of recesses 18 each having a U-shaped cross section are provided
`substantially symmetrically in the longitudinal direction of the drum 1 so as to sandwich the objective lens mounting
`portion 1a therebetween. Further, on the outer circumferential surface of the drum 1, focus direction drive coils 2 are
`wound in two parts, one in the optical axis direction of the objective lens mounting part 1a and the other in the front
`axis direction.
`Then, on the outer circumferential surface of the drum 1 sandwiched between the focus direction drive coils 2, 2, ribs
`3, 3 are arranged on the outer circumferential surface of both ends in the longitudinal direction at approximately the
`same height as the focus direction drive coils 2, respectively, and additionally, a pair of substantially prismatic dowels
`(standing members) 5 are provided at a predetermined interval on each of the ribs 3, 3, in order to fit and insert a radial
`direction drive coil 4…, which will be described later.
`Also, on the outer peripheral surface of the drum 1 sandwiched between the focus direction drive coils 2, 2,
`substantially rectangular parallelepiped-shaped fixating bases 6, 6 are provided at the center of each of the outer
`circumferential surfaces of both wings in the longitudinal direction at approximately the same height as the focus
`direction drive coil 2, and furthermore, a pair of substantially cylindrical protrusions (projecting members) 7… are
`provided on each of the fixating bases 6, 6 at a predetermined interval in order to mount a relay board 8, which will
`be described later.
`The aforementioned relay board 8 is formed into a substantially rectangular shape, and its length in the longitudinal
`direction is made to be approximately equal to the height in the optical axis direction of the outer peripheral surface
`of the drum 1 around which the focus direction drive coil 2 is wound. Further, a substantially circular hole 9 and a
`substantially semicircular notch 9a are formed so as to fit with each of the above-mentioned convex portions 7, 7.
`On the other hand, locking portions 8b... are provided on each of the relay boards 8, 8 at both ends in the longitudinal
`direction, respectively, and moreover, connection terminals 8a… are arranged adjacent to each of the locking portions
`8b… for connecting each of the drive coils 2, 4… to a control circuit (not shown), and each of these connection
`terminals 8a... is electrically connected to each of the corresponding locking portions 8b... within each relay board 8,
`8.
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`H4-113524 (4)
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`Furthermore, as shown in FIG. 2, the aforementioned pair of annular radial direction drive coils 4… are fixatedly attached by fitting
`their inner circumferential surfaces into each of the dowels 5…, respectively. In addition, on each of the fixating bases 6, 6, locking
`portions 8b, 8b on each of the relay boards 8, 8 are arranged in the optical axis direction, respectively, by fitting and fixating each
`of the relay boards 8, 8 to each convex part 7, 7 to which each hole 9, 9 and each notch part 9a, 9a correspond.
`As shown in FIGS. 3 and 4, with each magnet 15, 15 inserted into each corresponding recess 18, 18 so as to be freely forward and
`backward, the drum 1 is held on the substrate 14 by a drum support member 13 formed at the other end of each leaf spring 12…
`through a total of four leaf springs 12….That is, since the drum 1 is held in a four-joint link by each leaf spring 12…, the drum 1
`is held so as to be movable in the focus direction and the radial direction, with the optical axis of the objective lens 16 kept
`perpendicular to the recording surface of a recording medium (not shown).
`In addition, each drive coil 2, 4... is connected to a control circuit (not shown) via a locking portion 8b... and a leaf spring 12... by
`being connected to a connecting terminal 8a.... As a result, by the control signal from its control circuit, the drum 1 equipped with
`the objective lens 16 is controlled in the focus direction and radial direction by being driven by a magnetic circuit formed by each
`drive coil 2, 4.... and each magnet 15, 15, 17, 17.
`In this way, with the above configuration, the objective lens 16, which functions as a lens drive support, can be controlled in the
`focus direction and the radial direction, as in the conventional case.
`Incidentally, in the past, each relay board and each radial coil were directly fixated to the outer peripheral surface of the focus
`direction drive coil, making it difficult to position them; further, special tools are required for this purpose. In addition, the way the
`focus direction drive coil is wound is not always constant, and the condition of the surface thereof is not constant, so that their
`fixated state is unstable.
`However, by the above configuration, each relay board 8, 8 is provided with each convex portion 7…, and each radial coil 4… is
`provided with each dowel 5…, so as to fit therein; therefore, when fixating, they can be easily positioned without using a special
`tool, and furthermore, the accuracy of their position can be improved.
`Also, since one of the fixing surfaces can be a fitting surface with a more stable surface condition instead of the coil surface as in
`the conventional case, the bonding condition thereof can also be made more stable.
`Therefore, with the above configuration, the assembly work of the lens drive support becomes easier than before, the assembly
`time is shortened, and the performance of the assembled lens drive support becomes more constant. Furthermore, fewer tools are
`used during assembly operations.
`As a result, productivity can be improved in manufacturing the lens drive support.
`In addition, the shape of each dowel 5... and convex portion 7... is not limited to the shape of the above configuration, and any
`shape can be used as long as each radial direction drive coil 4…and each relay board 8,8 can be accurately positioned.
`(Effects of the Invention)
`As described above, the lens drive support according to claim 1 of the present invention is configured such that focus coils for
`driving the objective lens in the optical axis direction are divided and arranged in the optical axis direction, and protruding members
`for fixing the relay board are provided between each of the divided focus coils.
`By this means, the relay board can be easily positioned, and since the surface condition of the protrusion can be kept constant, the
`fixing condition thereof can also be kept constant.
`As a result, it is possible to improve the productivity of the lens drive support provided with the relay board.
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`H4-113524 (5)
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`As described above, the lens drive support according to claim 2 of the present invention is configured such that focus coils for
`driving the objective lens in the optical axis direction are divided and arranged in the optical axis direction, and upright members
`for fixing the radial coil is provided between each of these focus coils.
`By this means, the radial coil can be easily positioned, and since the surface condition of the erected member can be kept constant,
`the fixing condition thereof can also be kept constant.
`As a result, it is possible to improve the productivity of the lens drive support body including the radial coil.
`4. Brief Description of the Drawings
`FIGS. 1 to 4 show one embodiment of the present invention.
`FIG. 1 is a perspective view of the drum showing the fixing portions of the relay board and the radial coil.
`FIG. 2 is a perspective view of the drum shown in FIG. 1 with the relay board and radial coil fixated thereto.
`FIG. 3 is a side view of a lens drive support on which the drum of FIG. 2 is installed.
`FIG. 4 is a front view of the lens drive support in FIG. 3.
`FIG. 5 shows a conventional example, and is a perspective view of a lens drive support.
`1 is a drum (objective lens holder, 2 is a focus direction drive coil, 4 is a radial direction drive coil, 5 is a dowel (standing member),
`7 is a convex portion (projection member), and 8 is a relay board.
`
`Patent applicant: Sharp Corporation
`Agent: Patent Attorney Kenzo Hara
`
`
`FIG. 1
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`FIG. 3
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`FIG. 4
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`FIG. 2
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`H4-113524 (6)
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`Your global source
`for foreign filing services
`
`
`Certification of Accuracy
`
`
`
`I, Carl T. Sullivan, hereby attest that I am a translator fluent in English and Japanese, that
`I have translated the attached document from Japanese to English, and that to the best
`of my knowledge, ability and belief this translation is a true, accurate and complete
`translation of the original Japanese document that was provided to me.
`
`The document is designated as:
`
`JPH04113524A_Original_document_20240212183105
`___________________
`
`
`
`
`
`___________________
`Carl T. Sullivan
`
`February 14, 2024
`___________________
`Date
`
`244 Fifth Avenue, Suite R269, New York N.Y. 10001 | www.sourceip.com | info@sourceip.com
`
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`
`—160—
`-9-
`
`MICROSOFT- EX. 1004
`
`-9-
`
`MICROSOFT - EX. 1004
`
`

`

`13 Al. 4-113524 (3)
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`—161—
`-10-
`
`MICROSOFT- EX. 1004
`
`-10-
`
`MICROSOFT - EX. 1004
`
`

`

`331F4-113524 (4)
`
`Ben TWS,
`
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`HRERTS.
`
`—162-—
`-11-
`
`MICROSOFT- EX. 1004
`
`-11-
`
`MICROSOFT - EX. 1004
`
`

`

`33 HF 4-113524 (5)
`
`ARH OPKAB LMHS Y AMAR
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`:
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`Po
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`
`
`—163—-
`-12-
`
`MICROSOFT- EX. 1004
`
`-12-
`
`MICROSOFT - EX. 1004
`
`

`

`$3 HF 4-113524 (6)
`
`—164—
`
`-13-
`
`MICROSOFT- EX. 1004
`
`-13-
`
`MICROSOFT - EX. 1004
`
`
`