JPH05197991A - Optical head for optical disk device - Google Patents
Optical head for optical disk deviceInfo
- Publication number
- JPH05197991A JPH05197991A JP933992A JP933992A JPH05197991A JP H05197991 A JPH05197991 A JP H05197991A JP 933992 A JP933992 A JP 933992A JP 933992 A JP933992 A JP 933992A JP H05197991 A JPH05197991 A JP H05197991A
- Authority
- JP
- Japan
- Prior art keywords
- optical head
- optical
- axis
- dynamic vibration
- focus control
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
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- Optical Recording Or Reproduction (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は光ディスク装置の光学ヘ
ッドに係り、特に光学ヘッドのフォーカス制御動作時の
回動モードを制振する装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical head of an optical disk device, and more particularly to a device for damping a rotation mode of a focus control operation of the optical head.
【０００２】光ディスク装置の光学ヘッドは、高速アク
セスが実現できること、及びフォーカス制御動作を安定
に行いうることが必要とされる。The optical head of an optical disk device is required to be capable of high-speed access and to be capable of stable focus control operation.
【０００３】[0003]
【従来の技術】図４は、本出願人が先に提案した特開昭
６１−２０２３４０号に記載されている光ディスク装置
の光学ヘッドを示す。2. Description of the Related Art FIG. 4 shows an optical head of an optical disk device described in Japanese Patent Laid-Open No. 61-202340 previously proposed by the present applicant.
【０００４】光学ヘッド１は、レーザ光源（図示せず）
とは分離されており、軽量化が図られている。The optical head 1 is a laser light source (not shown).
It is separated from, and it is designed to be lightweight.
【０００５】２はキャリッジであり、ガイドレール３に
案内されて、磁気回路構造体４に沿って、光ディスク５
の径方向（Ｘ方向）に移動可能である。Reference numeral 2 denotes a carriage, which is guided by a guide rail 3 and extends along the magnetic circuit structure 4 along with an optical disk 5.
Can be moved in the radial direction (X direction).
【０００６】６は光学ヘッド本体であり、対物レンズ７
及びフォーカス制御用のコイル８が取り付けてある。Reference numeral 6 denotes an optical head body, and an objective lens 7
Also, a coil 8 for focus control is attached.
【０００７】光学ヘッド本体６は、基部側がキャリッジ
２に固定してあり、矢印Ｙ方向に延在する平行板ばね
９，１０の先端に取り付けてある。The optical head body 6 is fixed to the carriage 2 on the base side and is attached to the tips of the parallel leaf springs 9 and 10 extending in the arrow Y direction.
【０００８】コイル８は偏平矩形状であり、矢印Ｙ方向
上先端の面に固定してあり、磁気回路構造体４と対向し
ている。The coil 8 has a flat rectangular shape, is fixed to the upper end surface in the arrow Y direction, and faces the magnetic circuit structure 4.
【０００９】コイル８はフォーカス制御電流が供給され
ると、これが磁気回路構造体４が形成している磁界の磁
束と鎖交し、コイル８に駆動力Ｆが発生する。この力Ｆ
によって、光学ヘッド本体６は、図５に示すように、板
ばね９，１０の撓みを伴って、対物レンズ７の光軸１１
の方向（Ｚ方向）に変位し、フォーカスが制御される。When the focus control current is supplied to the coil 8, the coil 8 interlinks with the magnetic flux of the magnetic field formed by the magnetic circuit structure 4, and a driving force F is generated in the coil 8. This force F
As a result, the optical head body 6 causes the optical axis 11 of the objective lens 7 to move along with the bending of the leaf springs 9 and 10, as shown in FIG.
And the focus is controlled.
【００１０】コイル８が一個だけであり、コイルを複数
設けた構成に比べて、光学ヘッド本体６はその分軽量化
されており、アクセスは高速で行われる。The optical head main body 6 is lighter by that amount as compared with a structure in which only one coil 8 is provided and a plurality of coils are provided, and access is performed at high speed.
【００１１】[0011]
【発明が解決しようとする課題】ここで、フォーカス制
御時に光学ヘッド本体６に作用する力についてみる。The force acting on the optical head body 6 during focus control will now be described.
【００１２】図５に示すように、光学ヘッド本体６に
は、コイル８に力Ｆ，重心Ｇに慣性力Ｆｉ，板ばね９，
１０との付け根部にばね反力Ｆｓが作用する。As shown in FIG. 5, in the optical head body 6, a force F is applied to the coil 8, an inertial force Fi is applied to the center of gravity G, a leaf spring 9,
A spring reaction force Fs acts on the base of the spring 10.
【００１３】力Ｆ，Ｆｉ，Ｆｓは、Ｚ軸上に一直線に並
んでいず、Ｙ方向にずれている。The forces F, Fi, Fs are not aligned on the Z axis but are offset in the Y direction.
【００１４】このため、光学ヘッド本体６には、この重
心Ｇを通るＸ軸回りに、偶力Ｍが作用し、これによって
光学ヘッド１には、図６に示すようにＸ軸回りの回転モ
ードの振動（角度振動）が励起されてしまう。Therefore, a couple M acts on the optical head main body 6 around the X axis passing through the center of gravity G, which causes the optical head 1 to rotate around the X axis as shown in FIG. Vibration (angular vibration) is excited.
【００１５】光学ヘッド１のＺ軸方向振幅−周波数特性
は、図７に示すように、線Ｉで示すＺ軸方向の振動に、
線IIで示すＸ軸回りの回動モードの振動が加わった、線
IIIで示す特性となる。As shown in FIG. 7, the amplitude-frequency characteristic of the optical head 1 in the Z-axis direction is as shown in FIG.
The line with the vibration of the rotation mode around the X axis shown by line II
It has the characteristics shown in III.
【００１６】このため、位相−周波数特性は、図８に、
線IVで示す如くになり、回転モードの共振周波数ｆ
0 （約３ｋＨｚ）で位相が反転してしまう。Therefore, the phase-frequency characteristics are shown in FIG.
As shown by the line IV, the resonance frequency f of the rotation mode is
The phase is inverted at 0 (about 3 kHz).
【００１７】この結果、フォーカス制御動作の制御帯域
１５が２３ＫＨｚ以下となって狭くなってしまう。As a result, the control band 15 of the focus control operation becomes 23 KHz or less and becomes narrow.
【００１８】そこで、本発明は、光学ヘッドの上記回動
モードの振動の共振を制振してフォーカス制御周波数帯
域を広くし、フォーカス制御を安定化することを可能と
した光ディスク装置の光学ヘッドを提供することを目的
とする。Therefore, the present invention provides an optical head of an optical disk device capable of stabilizing the focus control by damping the resonance of the vibration of the optical head in the rotation mode to widen the focus control frequency band. The purpose is to provide.
【００１９】[0019]
【課題を解決するための手段】請求項１の発明は、対物
レンズ及びフォーカス制御用のコイルを有する光学ヘッ
ド本体が平行ばねにより、上記対物レンズの光軸方向に
変位可能に支持され、該駆動コイルが上記平行ばねの延
在方向上の上記光学ヘッド本体の両側のうち一方の側に
のみ設けられた光ディスク装置の光学ヘッドにおいて、
上記光学ヘッド本体のうち、上記平行ばねの延在方向及
び上記対物レンズの光軸方向の双方に直交する方向上の
両側に、一端を該光学ヘッド本体に固定して上記対物レ
ンズの光軸と平行に配された板ばねと、該板ばねの自由
端に固定された重錘とよりなる構成の動吸振器を備えた
構成としたものである。According to a first aspect of the present invention, an optical head main body having an objective lens and a coil for focus control is supported by a parallel spring so as to be displaceable in the optical axis direction of the objective lens, and the driving is performed. In an optical head of an optical disk device in which a coil is provided only on one side of both sides of the optical head body in the extending direction of the parallel spring,
Of the optical head body, one end is fixed to the optical head body on both sides in a direction orthogonal to both the extending direction of the parallel spring and the optical axis direction of the objective lens, and the optical axis of the objective lens is formed. The configuration is provided with a dynamic vibration reducer including a leaf spring arranged in parallel and a weight fixed to the free end of the leaf spring.
【００２０】請求項２の発明は、請求項１の板ばねを、
該平行ばねの先端を折り曲げて形成した構成としたもの
である。According to a second aspect of the invention, the leaf spring of the first aspect is
The parallel springs are formed by bending the tips.
【００２１】[0021]
【作用】請求項１の動吸振器において板ばねを対物レン
ズの光軸と平行に配した構成は、光学ヘッド本体の平行
ばね及び光軸に直交する方向の軸を中心とする回動モー
ドの共振を制振すると共に、光学ヘッド本体の対物レン
ズの光軸方向の振動に対しては剛体として機能するよう
に作用する。In the dynamic vibration reducer of claim 1, the leaf spring is arranged in parallel with the optical axis of the objective lens in a rotation mode about the parallel spring of the optical head body and an axis in a direction orthogonal to the optical axis. It acts to suppress the resonance and to act as a rigid body against the vibration of the objective lens of the optical head body in the optical axis direction.
【００２２】動吸振器を光学ヘッド本体の両側に設けた
構成は、動吸振器の制振作用を光学ヘッド本体の両側に
均等に働かせるように作用する。The structure in which the dynamic vibration reducers are provided on both sides of the optical head main body acts so that the vibration damping action of the dynamic vibration reducer is evenly exerted on both sides of the optical head main body.
【００２３】請求項２の板ばねを平行ばねを折り曲げて
形成した構成は、板ばねの部品を不要とするように作用
する。The leaf spring according to the second aspect of the present invention, which is formed by bending the parallel spring, acts so as to eliminate the need for parts of the leaf spring.
【００２４】[0024]
【実施例】次に本発明の一実施例になる光ディスク装置
の光学ヘッド２０について、図１を参照して説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS An optical head 20 of an optical disk device according to an embodiment of the present invention will be described with reference to FIG.
【００２５】図１中、図４に示す構成部分と実質上対応
する部分には同一符号を付す。In FIG. 1, the parts substantially corresponding to the components shown in FIG. 4 are designated by the same reference numerals.
【００２６】光学ヘッド本体６のＸ方向上の両側には、
動吸振器２１，２２が設けてある。On both sides of the optical head body 6 in the X direction,
Dynamic vibration absorbers 21 and 22 are provided.
【００２７】動吸振器２１，２２は、夫々板ばね２３，
２４と、重錘２５，２６とよりなる。The dynamic vibration absorbers 21 and 22 have leaf springs 23 and
24 and weights 25 and 26.
【００２８】板ばね２３，２４は、夫々上端を、光学ヘ
ッド本体６の上面２７のＹ方向上中心の位置からＸ方向
に突出している突出腕部２８，２９に固定されており、
光軸１１と平行に図１中下方に延在している。The leaf springs 23 and 24 are fixed at their upper ends to projecting arm portions 28 and 29 projecting in the X direction from the center of the upper surface 27 of the optical head body 6 in the Y direction.
It extends downward in FIG. 1 in parallel with the optical axis 11.
【００２９】重錘２５，２６は各板ばね２３，２４の下
端に接着してある。The weights 25 and 26 are adhered to the lower ends of the leaf springs 23 and 24, respectively.
【００３０】ここで、板ばね２３，２４のばね条数及び
重錘２５，２６の質量等が適宜定めてあり、上記の動吸
振器２１，２２は、一次モードの共振周波数ｆ1 が、光
学ヘッド２０の図７に示すＸ軸回りの回転モードの共振
周波数ｆ0 と一致させてある。Here, the number of springs of the leaf springs 23 and 24 and the mass of the weights 25 and 26 are appropriately determined, and the dynamic vibration absorbers 21 and 22 have the resonance frequency f 1 of the primary mode of The resonance frequency f 0 of the rotation mode of the head 20 around the X axis shown in FIG. 7 is matched.
【００３１】次に、上記構成の光学ヘッド２０の特性に
ついて説明する。Next, the characteristics of the optical head 20 having the above structure will be described.
【００３２】フォーカス制御時、光学ヘッド本体６は、
従来と同じく、図５に示すようにＺ軸方向に振動すると
共に、図６に示すようにＸ軸回りに回動モードの振動を
する。During focus control, the optical head body 6 is
As in the conventional case, it vibrates in the Z-axis direction as shown in FIG. 5 and vibrates in the rotation mode about the X-axis as shown in FIG.
【００３３】Ｚ軸方向は、板ばね２３，２４の伸縮する
方向であり、板ばね２３，２４の剛性は高く、動吸振器
２１，２２のＺ軸方向の共振周波数は、フォーカス制御
の周波数帯域より十分に高い。The Z-axis direction is a direction in which the leaf springs 23 and 24 expand and contract, the leaf springs 23 and 24 have high rigidity, and the resonance frequencies of the dynamic vibration absorbers 21 and 22 in the Z-axis direction are in the focus control frequency band. Higher enough.
【００３４】このため、Ｚ軸方向振動に対しては、動吸
振器２１，２２は光学ヘッド本体６の振動には影響を及
ぼさず、光学ヘッド本体６は、図７中の線Ｉと同じく、
図２中線Ｉで示すように振動する。Therefore, the dynamic vibration absorbers 21 and 22 do not affect the vibration of the optical head main body 6 with respect to the Z-axis direction vibration, and the optical head main body 6 is similar to the line I in FIG.
It vibrates as shown by the middle line I in FIG.
【００３５】Ｘ軸回りの回動モードの振動に対しては、
板ばね２３，２４が図１中矢印３０の方向に撓んで、動
吸振器２１，２２がＸ軸回りに振動する。動吸振器２
１，２２は、光学ヘッド２０の回動モード振動の位相と
は逆の位相で振動し、且つ周波数ｆ1 （＝ｆ0 ）で共振
する。With respect to the vibration in the rotation mode about the X axis,
The leaf springs 23 and 24 bend in the direction of arrow 30 in FIG. 1, and the dynamic vibration absorbers 21 and 22 vibrate around the X axis. Dynamic vibration absorber 2
1 and 22 vibrate in a phase opposite to the phase of the rotation mode vibration of the optical head 20, and resonate at a frequency f 1 (= f 0 ).
【００３６】このため、光学ヘッド２０のＸ軸回りの回
動モードの振動は、動吸振器２１，２２によって共振を
抑制され、図２中線IIａで示す如くになる。Therefore, the vibrations of the optical head 20 in the rotation mode about the X-axis are suppressed in resonance by the dynamic vibration absorbers 21 and 22 and are as shown by the line IIa in FIG.
【００３７】これにより、光学ヘッド２０のＺ軸方向振
幅−周波数特性は、図２中、線IIIａで示す如くにな
り、図７中の線III のうちのピーク１６が無いものとな
る。As a result, the Z-axis direction amplitude-frequency characteristic of the optical head 20 becomes as shown by the line IIIa in FIG. 2, and the peak 16 of the line III in FIG. 7 does not exist.
【００３８】このため、光学ヘッド２０の位相−周波数
特性は、図３中、線IVａで示す如くになり、従来発生し
ていた位相反転が無いものとなる。Therefore, the phase-frequency characteristic of the optical head 20 is as shown by the line IVa in FIG. 3, and there is no phase inversion which has occurred conventionally.
【００３９】これにより、フォーカス制御が可能である
周波数帯域が符号３１で示すように従来に比べて高域側
に広がり、フォーカス制御系の特性が向上し、フォーカ
ス制御が安定に行われる。As a result, the frequency band in which focus control is possible spreads to the high frequency side as compared with the conventional one as shown by reference numeral 31, the characteristics of the focus control system are improved, and the focus control is performed stably.
【００４０】動吸振器を光学ヘッド本体６の一方の側面
側にだけ設けた場合には、制振作用が光学ヘッド本体６
の中心に対してアンバランスとなって光軸１１がＸ−Ｚ
面内で振れフォーカス制御が悪影響を受けるおそれがあ
る。しかし、本実施例では、動吸振器２１，２２を光学
ヘッド本体６の両側に設けたことにより、制振作用が光
学ヘッド本体６の両側に等しく作用するため、光学ヘッ
ド本体６に不要な捩じり力等は作用せず、光学ヘッド本
体６は光軸１１の向きを変えずにＺ軸方向に振動し、フ
ォーカス制御はより安定に行われる。When the dynamic vibration reducer is provided only on one side surface of the optical head body 6, the vibration damping action is obtained by the optical head body 6.
Is unbalanced with respect to the center of
The shake focus control may be adversely affected in the plane. However, in this embodiment, since the dynamic vibration absorbers 21 and 22 are provided on both sides of the optical head main body 6, the vibration damping action acts equally on both sides of the optical head main body 6, so that unnecessary twisting of the optical head main body 6 occurs. The twisting force or the like does not act, the optical head body 6 vibrates in the Z-axis direction without changing the direction of the optical axis 11, and the focus control is performed more stably.
【００４１】また、動吸振器２１，２２は、図１より分
かるように、光学ヘッド本体６の高さ内に収まってお
り、光学ヘッド２０は動吸振器２１，２２を設けても高
さ寸法は増えてはいない。As can be seen from FIG. 1, the dynamic vibration absorbers 21 and 22 are contained within the height of the optical head main body 6, and the optical head 20 has a height dimension even if the dynamic vibration absorbers 21 and 22 are provided. Is not increasing.
【００４２】なお、上記の板ばね２３，２４は、上側の
板ばね９の先端を延長し、この部分を下方に折り曲げて
形成してもよい。これにより、板ばね２３，２４を独立
の部品とした場合に比べて、部品点数が削減できる。The leaf springs 23 and 24 may be formed by extending the tip of the upper leaf spring 9 and bending this portion downward. As a result, the number of parts can be reduced as compared with the case where the leaf springs 23 and 24 are independent parts.
【００４３】また、板ばね９，１０，２３，２４は、共
に、アクリル系粘弾性樹脂が厚さ0.05mmで被覆された構
成となっている。これにより、光学ヘッド２０は高次の
機械共振が抑制される。Further, the leaf springs 9, 10, 23, 24 are both constructed by coating the acrylic viscoelastic resin with a thickness of 0.05 mm. As a result, the optical head 20 suppresses high-order mechanical resonance.
【００４４】[0044]
【発明の効果】以上説明した様に、請求項１の発明によ
れば、フォーカス制御用コイルを片側にだけ設けて軽量
化を図った光学ヘッドにおいて、光学ヘッドの回転モー
ドの共振を効果的に制振することが出来、しかも光学ヘ
ッドの光軸方向振動を動吸振器による悪影響を受けるこ
となく行うことが出来る。As described above, according to the first aspect of the invention, in the optical head in which the focus control coil is provided only on one side to reduce the weight, the resonance of the rotation mode of the optical head is effectively performed. It is possible to suppress the vibration, and moreover, the vibration of the optical head in the optical axis direction can be performed without being adversely affected by the dynamic vibration absorber.
【００４５】更には、動吸振器による制振作用が光学ヘ
ッド本体の両側に均等に作用するため、光学ヘッドの光
軸が傾くことを防止出来る。Furthermore, since the vibration damping action of the dynamic vibration absorber acts evenly on both sides of the optical head body, it is possible to prevent the optical axis of the optical head from tilting.
【００４６】従って、軽量であり、しかもフォーカス制
御を十分に広い周波数帯域に亘って安定に行うことが出
来る光学ヘッドを実現出来る。Therefore, it is possible to realize an optical head which is light in weight and capable of stably performing focus control over a sufficiently wide frequency band.
【００４７】また、請求項２の発明によれば、部品点数
の削減を図ることが出来る。According to the invention of claim 2, the number of parts can be reduced.
【図面の簡単な説明】[Brief description of drawings]
【図１】本発明の一実施例になる光ディスク装置の光学
ヘッドを示す図である。FIG. 1 is a diagram showing an optical head of an optical disk device according to an embodiment of the present invention.
【図２】図１の光学ヘッドのＺ軸方向振幅−周波数特性
を示す図である。FIG. 2 is a diagram showing Z-axis direction amplitude-frequency characteristics of the optical head of FIG.
【図３】図１の光学ヘッドの位相−周波数特性を示す図
である。FIG. 3 is a diagram showing a phase-frequency characteristic of the optical head of FIG.
【図４】従来の光学ヘッドの１例を示す図である。FIG. 4 is a diagram showing an example of a conventional optical head.
【図５】図４の光学ヘッドのＺ軸方向振動を示す図であ
る。5 is a diagram showing Z-axis direction vibration of the optical head of FIG.
【図６】図４の光学ヘッドのＸ軸回りの回転モード振動
を示す図である。6 is a diagram showing rotation mode vibration around the X axis of the optical head of FIG.
【図７】図４の光学ヘッドのＺ軸方向振幅−周波数特性
を示す図である。7 is a diagram showing Z-axis direction amplitude-frequency characteristics of the optical head of FIG.
【図８】図４の光学ヘッドの位相−周波数特性を示す図
である。8 is a diagram showing a phase-frequency characteristic of the optical head of FIG.
【符号の説明】 ２ キャリッジ ３ ガイドレール ４ 磁気回路構造体 ５ 光ディスク ６ 光学ヘッド本体 ７ 対物レンズ ８ フォーカス制御用コイル ９，１０ 平行板ばね １１ 光軸 ２０ 光学ヘッド ２１，２２ 動吸振器 ２３，２４ 板ばね ２５，２６ 重錘 ２８，２９ 突出腕部 ３１ フォーカス制御可能周波数帯域[Explanation of Codes] 2 Carriage 3 Guide Rail 4 Magnetic Circuit Structure 5 Optical Disc 6 Optical Head Body 7 Objective Lens 8 Focus Control Coil 9, 10 Parallel Leaf Spring 11 Optical Axis 20 Optical Head 21, 22 Dynamic Vibration Absorber 23, 24 Leaf spring 25, 26 Weight 28, 29 Projecting arm 31 Focus controllable frequency band
Claims (2)
のコイルを有する光学ヘッド本体（６）が平行ばね
（９，１０）により、上記対物レンズの光軸（１１）方
向に変位可能に支持され、該コイル（８）が上記平行ば
ねの延在方向（Ｙ）上の上記光学ヘッド本体の両側のう
ち一方の側にのみ設けられた光ディスク装置の光学ヘッ
ドにおいて、 上記光学ヘッド本体のうち、上記平行ばねの延在方向
（Ｙ）及び上記対物レンズ（７）の光軸（１１）の方向
（Ｚ）の双方に直交する方向（Ｘ）上の両側に、 一端を該光学ヘッド本体に固定して上記対物レンズの光
軸と平行に配された板ばね（２３，２４）と、該板ばね
の自由端に固定された重錘（２５，２６）とよりなる構
成の動吸振器（２５，２６）を備えた構成としたことを
特徴とする光ディスク装置の光学ヘッド。1. An optical head body (6) having an objective lens (7) and a coil for focus control is supported by a parallel spring (9, 10) so as to be displaceable in the optical axis (11) direction of the objective lens. An optical head of an optical disk device in which the coil (8) is provided on only one side of the optical head main body in the extending direction (Y) of the parallel spring, One end is fixed to the optical head main body on both sides in a direction (X) orthogonal to both the extending direction (Y) of the parallel spring and the direction (Z) of the optical axis (11) of the objective lens (7). And a dynamic vibration absorber (25, 26) having a configuration including leaf springs (23, 24) arranged parallel to the optical axis of the objective lens and weights (25, 26) fixed to the free ends of the leaf springs. 26) is provided with an optical disk. Optical head click device.
１０）の先端を折り曲げて形成した構成としたことを特
徴とする光学ヘッド。2. The leaf spring according to claim 1, wherein the parallel spring (9,
An optical head having a configuration in which the tip of 10) is bent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP933992A JPH05197991A (en) | 1992-01-22 | 1992-01-22 | Optical head for optical disk device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP933992A JPH05197991A (en) | 1992-01-22 | 1992-01-22 | Optical head for optical disk device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05197991A true JPH05197991A (en) | 1993-08-06 |
Family
ID=11717716
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP933992A Withdrawn JPH05197991A (en) | 1992-01-22 | 1992-01-22 | Optical head for optical disk device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05197991A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6259671B1 (en) | 1997-08-27 | 2001-07-10 | Nhk Spring Co., Ltd. | Object lens actuator |
| JP2004154245A (en) * | 2002-11-05 | 2004-06-03 | Pentax Corp | Two-channel endoscope |
-
1992
- 1992-01-22 JP JP933992A patent/JPH05197991A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6259671B1 (en) | 1997-08-27 | 2001-07-10 | Nhk Spring Co., Ltd. | Object lens actuator |
| JP2004154245A (en) * | 2002-11-05 | 2004-06-03 | Pentax Corp | Two-channel endoscope |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 19990408 |