JP3788986B2 - Optical pickup device - Google Patents

Optical pickup device Download PDF

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JP3788986B2
JP3788986B2 JP2003345094A JP2003345094A JP3788986B2 JP 3788986 B2 JP3788986 B2 JP 3788986B2 JP 2003345094 A JP2003345094 A JP 2003345094A JP 2003345094 A JP2003345094 A JP 2003345094A JP 3788986 B2 JP3788986 B2 JP 3788986B2
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light receiving
receiving element
housing
flexible printed
element holder
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JP2005115985A (en
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良夫 齋藤
義一 渋谷
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TDK Corp
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Description

本発明は、光記録再生装置または光再生装置の光ピックアップ装置に係わり、より詳しくはその受光素子ホルダの取付け構造に関する。   The present invention relates to an optical recording / reproducing apparatus or an optical pickup apparatus of an optical reproducing apparatus, and more particularly to a mounting structure of a light receiving element holder.

光記録再生装置または光再生装置においては、光ディスクから反射されたレーザー光を受光する素子をフレキシブルプリント基板に取付け、そのフレキシブルプリント基板を受光素子ホルダの片面に固着し、その受光素子ホルダを、ハウジングの側面に固着して取付けた構成を有している（例えば特許文献１参照）。このような光記録再生装置においては、一般的に、図５に示すような構造で受光素子が取付けられる。   In an optical recording / reproducing apparatus or an optical reproducing apparatus, an element that receives laser light reflected from an optical disk is attached to a flexible printed circuit board, the flexible printed circuit board is fixed to one surface of a light receiving element holder, and the light receiving element holder is attached to a housing. (See, for example, Patent Document 1). In such an optical recording / reproducing apparatus, a light receiving element is generally attached with a structure as shown in FIG.

図５において、１はハウジングであり、円盤状の光ディスクを用いる場合には、駆動機構により、光ディスクの半径方向に移動自在に支持され、駆動されるものである。該ハウジングの側面には、外方に突出した台１ａ、１ａ間に受光素子２を収容する収容部３が設けられ、受光素子２は、検出信号を外部またはハウジング１に搭載した回路に導くフレキシブルプリント基板４の端部に取付けられ、該フレキシブルプリント基板４は受光素子ホルダ５のハウジング対向面に固着され、該受光素子ホルダ５をハウジング１の側面に接着剤６により固着して取付けられる。   In FIG. 5, reference numeral 1 denotes a housing. When a disc-shaped optical disk is used, it is supported and driven by a drive mechanism so as to be movable in the radial direction of the optical disk. On the side surface of the housing, a receiving portion 3 for receiving the light receiving element 2 is provided between the bases 1a and 1a projecting outward, and the light receiving element 2 is flexible to guide a detection signal to the outside or a circuit mounted on the housing 1. The flexible printed circuit board 4 is attached to the end of the printed circuit board 4, and is fixed to the housing facing surface of the light receiving element holder 5, and the light receiving element holder 5 is fixed to the side surface of the housing 1 with an adhesive 6.

特開平９−３２００８７公報JP-A-9-320087

上述の従来の光ピックアップ装置において、受光素子ホルダ５を取付ける場合、受光素子２が好適な受光位置に固定されるようにするため、受光素子ホルダ５を不図示の治具により保持しておき、受光素子２により検出されるレーザ光を測定することによって受光素子２の位置の適否を判定し、好適位置になったところで接着剤６により固着する。   In the conventional optical pickup device described above, when the light receiving element holder 5 is attached, the light receiving element holder 5 is held by a jig (not shown) in order to fix the light receiving element 2 at a suitable light receiving position. The suitability of the position of the light receiving element 2 is determined by measuring the laser light detected by the light receiving element 2, and the adhesive 6 is fixed when the suitable position is reached.

このような位置調整を行う場合、受光素子２より幅広のフレキシブルプリント基板４を位置調整のために矢印Ｘ方向に最大限に動かしても、フレキシブルプリント基板４の側縁が受光素子収容のための収容部３の壁面３ｘに当接しないようにするため、フレキシブルプリント基板４の側縁と前記壁面３ｘとの間に間隔Ｓを設けている。このため、収容部３を広幅に設定する必要があり、これに伴い、受光素子ホルダ５も大きくなり、小型化を阻害するという問題点がある。   When such position adjustment is performed, even if the flexible printed circuit board 4 wider than the light receiving element 2 is moved to the maximum in the direction of the arrow X for position adjustment, the side edge of the flexible printed circuit board 4 is used for accommodating the light receiving element. In order not to come into contact with the wall surface 3x of the housing portion 3, a space S is provided between the side edge of the flexible printed circuit board 4 and the wall surface 3x. For this reason, it is necessary to set the accommodating part 3 to be wide, and with this, the light receiving element holder 5 is also enlarged, and there is a problem in that downsizing is hindered.

本発明は、上記問題点に鑑み、受光素子ホルダの小型化を図れる構成の光ピックアップ装置を提供することを目的とする。   In view of the above problems, an object of the present invention is to provide an optical pickup device having a configuration capable of reducing the size of a light receiving element holder.

（１）本発明の光ピックアップ装置は、受光素子ホルダを光ピックアップ装置のハウジングの側面に固着してなる光ピックアップ装置であって、
受光素子ホルダのハウジング対向面に、フレキシブルプリント基板の厚みより深い凹部を設け、
受光素子を取付けたフレキシブルプリント基板を前記受光素子ホルダの凹部に固着し、
前記フレキシブルプリント基板に取付けた受光素子を、前記ハウジングに設けた収容部に収容すると共に、
前記フレキシブルプリント基板を固着した受光素子ホルダの前記凹部の両側の突出部分を、前記ハウジングの側面に接着することにより、前記受光素子ホルダを前記ハウジングに取付けたことを特徴とする。 (1) An optical pickup device of the present invention is an optical pickup device in which a light receiving element holder is fixed to a side surface of a housing of an optical pickup device,
A recess deeper than the thickness of the flexible printed circuit board is provided on the housing facing surface of the light receiving element holder,
A flexible printed circuit board to which a light receiving element is attached is fixed to the recess of the light receiving element holder,
While accommodating the light receiving element attached to the flexible printed circuit board in the accommodating portion provided in the housing,
The light receiving element holder is attached to the housing by adhering protruding portions on both sides of the concave portion of the light receiving element holder to which the flexible printed circuit board is fixed to the side surface of the housing.

（２）また、本発明の光ピックアップ装置は、前記（１）において、
前記フレキシブルプリント基板の両側縁を、前記ハウジングの側面に対面させたことを特徴とする。 (2) The optical pickup device of the present invention is the above (1).
The both side edges of the flexible printed circuit board are opposed to the side surfaces of the housing.

本発明の光ピックアップ装置は、受光素子ホルダのハウジング対向面に、フレキシブルプリント基板の厚みより深い凹部を設け、その凹部に、受光素子を取付けたフレキシブルプリント基板を固着したので、受光素子ホルダの位置を調整して取付ける際に、フレキシブルプリント基板の両側縁がハウジングの収容部の側壁に当接するおそれがなくなり、収容部の幅を小さくすることができる。このように、受光素子収容のための収容部を小さい幅に形成できるので、これに伴い、受光素子ホルダを小型化することができる。   In the optical pickup device of the present invention, a concave portion deeper than the thickness of the flexible printed circuit board is provided on the housing facing surface of the light receiving element holder, and the flexible printed circuit board to which the light receiving element is attached is fixed to the concave portion. When adjusting and attaching, there is no possibility that both side edges of the flexible printed circuit board abut against the side wall of the housing housing portion, and the width of the housing portion can be reduced. Thus, since the accommodating part for light receiving element accommodation can be formed in a small width | variety, a light receiving element holder can be reduced in size in connection with this.

また、フレキシブルプリント基板の幅の制約が緩和されるので、フレキシブルプリント基板としてサイズの大きいものを用いることができ、フレキシブルプリント基板内の配線間のクロストークを低減することができる。   In addition, since the restriction on the width of the flexible printed board is relaxed, a flexible printed board having a large size can be used, and crosstalk between wirings in the flexible printed board can be reduced.

また、受光素子を収容する収容部を小さくすることができ、その分、その両側の受光素子ホルダの取付け面を広く確保することができるため、接着強度を高めることができる。   Moreover, since the accommodating part which accommodates a light receiving element can be made small and the attachment surface of the light receiving element holder of the both sides can be ensured widely, the adhesive strength can be raised.

本発明において、特にフレキシブルプリント基板の両側縁を受光素子ホルダの凹部とハウジング側面との間の隙間に挿入した状態で取付けることにより、前記効果が助長される。   In the present invention, in particular, the above-mentioned effect is promoted by attaching both side edges of the flexible printed circuit board in a state of being inserted into the gap between the recess of the light receiving element holder and the side surface of the housing.

図１は本発明による光ピックアップ装置の一実施の形態を示すブロック図であり、本実施の形態はＣＤ用、ＤＶＤ用に兼用されるものについて示している。９、１０はレーザー素子であり、一方がＣＤ用、他方がＤＶＤ用である。１１、１２は回折格子、１３はレーザー素子９、１０からのレーザ光を１つの光学系で兼用するためのプリズム、１４は光ディスク１５からの反射光を受光素子２に反射させるためのプリズム、１６は対物レンズ１７へのレーザ光を平行化するためのレンズ、１９は波長選択フィルタ、２０は非点収差を発生させるシリンドリカルレンズである。   FIG. 1 is a block diagram showing an embodiment of an optical pickup device according to the present invention, and this embodiment shows what is used for both a CD and a DVD. Reference numerals 9 and 10 denote laser elements, one for CD and the other for DVD. 11 and 12 are diffraction gratings, 13 is a prism for sharing laser light from the laser elements 9 and 10 in one optical system, 14 is a prism for reflecting light reflected from the optical disk 15 to the light receiving element 2, and 16 Is a lens for collimating the laser beam to the objective lens 17, 19 is a wavelength selection filter, and 20 is a cylindrical lens that generates astigmatism.

図２は本発明の光ピックアップ装置の一実施の形態を示す斜視図であり、１はハウジング、２１、２２は光ディスクの半径方向に設けられる不図示のガイド軸に沿ってハウジング１を移動自在に装着するガイド軸装着部である。また、１７は前記対物レンズ、２３は前記対物レンズ１７をフォーカス方向、トラッキング方向に駆動するための駆動装置であり、該駆動装置２３はハウジング１に搭載される。５Ａは本発明による受光素子ホルダであり、該受光素子ホルダ５Ａはハウジング１の側面に固着して取付けられる。ハウジング１には、ハウジング１内の回路を不図示のフレキシブルプリント基板を介して外部回路に電気的に接続するためのコネクタ２４が取付けられる。   FIG. 2 is a perspective view showing one embodiment of the optical pickup device of the present invention. 1 is a housing, 21 and 22 are movable along a guide shaft (not shown) provided in the radial direction of the optical disk. A guide shaft mounting portion to be mounted. Reference numeral 17 denotes the objective lens, and reference numeral 23 denotes a drive device for driving the objective lens 17 in the focus direction and the tracking direction. The drive device 23 is mounted on the housing 1. Reference numeral 5A denotes a light receiving element holder according to the present invention, and the light receiving element holder 5A is fixedly attached to the side surface of the housing 1. A connector 24 for electrically connecting a circuit in the housing 1 to an external circuit via a flexible printed board (not shown) is attached to the housing 1.

図３は本発明による受光素子ホルダ５Ａの一例をハウジング1側から見た斜視図、図４は該受光素子ホルダ５Ａをハウジング１の側面に取付けた状態を示す平面図であり、図５と同じ符号は同じ機能を発揮するものを示す。受光素子ホルダ５Ａは例えばアルミニウムなどの金属のプレス成形品でなり、そのハウジング対向面に、フレキシブルプリント基板４の厚みより深い凹部５ｂを設ける。そして該凹部５ｂに、受光素子２を端部に取付けたフレキシブルプリント基板４を、好ましくは熱圧着により固着する。このように熱圧着が接着に比較して好ましい理由は、接着剤による固着の場合には、接続剤が厚みを持ち、固着後に変形などにより受光素子２の位置に変化が起こるおそれがあり、一方、熱圧着の場合には、そのような事態が起こりにくいためである。フレキシブルプリント基板４は、前記コネクタ２４またはハウジング１に搭載する回路に接続される。   3 is a perspective view of an example of the light receiving element holder 5A according to the present invention as viewed from the housing 1, and FIG. 4 is a plan view showing a state in which the light receiving element holder 5A is attached to the side surface of the housing 1, the same as FIG. Reference numerals indicate the same functions. The light receiving element holder 5A is made of, for example, a metal press-molded product such as aluminum, and a recess 5b deeper than the thickness of the flexible printed circuit board 4 is provided on the housing facing surface. And the flexible printed circuit board 4 which attached the light receiving element 2 to the edge part is fixed to this recessed part 5b, preferably by thermocompression bonding. The reason why thermocompression bonding is preferable compared to bonding is that, in the case of fixing with an adhesive, the connecting agent has a thickness, and there is a possibility that the position of the light receiving element 2 may change due to deformation after fixing, This is because such a situation hardly occurs in the case of thermocompression bonding. The flexible printed circuit board 4 is connected to the connector 24 or a circuit mounted on the housing 1.

前記受光素子ホルダ５Ａの取付けの際には、受光素子ホルダ５Ａに設けた孔５ｄに不図示の治具の突起を挿入してセットし、レーザー素子９、１０の一方を駆動して受光素子２で受光させ、その受光状態により、受光素子ホルダ５Ａの好適な取付け位置を決定して接着剤６によりハウジング１の側面に受光素子ホルダ５Ａを固着する。他方のレーザー素子は、その受光素子位置に合わせて調整される。   When the light receiving element holder 5A is attached, a projection of a jig (not shown) is inserted and set in a hole 5d provided in the light receiving element holder 5A, and one of the laser elements 9 and 10 is driven to receive the light receiving element 2. In accordance with the light receiving state, a suitable mounting position of the light receiving element holder 5A is determined, and the light receiving element holder 5A is fixed to the side surface of the housing 1 by the adhesive 6. The other laser element is adjusted in accordance with the position of the light receiving element.

この場合、前記フレキシブルプリント基板４に取付けた受光素子２を、前記ハウジング１に設けた収容部３Ａに収容すると共に、前記フレキシブルプリント基板４を固着した受光素子ホルダ５Ａの前記凹部５ｂの両側の突出部分５ｃ、５ｃを、前記ハウジングの側面に突出させて形成した台１ａ、１ａに接着剤６により接着する。   In this case, the light receiving element 2 attached to the flexible printed circuit board 4 is housed in the housing portion 3A provided in the housing 1, and the protrusions on both sides of the recess 5b of the light receiving element holder 5A to which the flexible printed circuit board 4 is fixed. The portions 5c and 5c are bonded to the bases 1a and 1a formed by protruding the side surfaces of the housing by an adhesive 6.

このような構造で受光素子ホルダ５Ａをハウジング１の側面に取付けることにより、前記フレキシブルプリント基板４の前記ハウジング１の収容部３Ａの壁面３ｘに当接させることなく取付けることができる。このような取付け構造によれば、受光素子２を収容するための収容部３Ａを小さい幅に形成できるので、これに伴い、受光素子ホルダ５Ａを小型化することができる。   By attaching the light receiving element holder 5A to the side surface of the housing 1 with such a structure, the light receiving element holder 5A can be attached without being brought into contact with the wall surface 3x of the housing portion 3A of the housing 1 of the flexible printed circuit board 4. According to such an attachment structure, since the accommodating portion 3A for accommodating the light receiving element 2 can be formed with a small width, the light receiving element holder 5A can be reduced in size accordingly.

また、フレキシブルプリント基板４の幅の制約が緩和されるので、サイズが大きく、内部配線間の間隔が大きいフレキシブルプリント基板４を用いることができ、フレキシブルプリント基板４内の配線間のクロストークを低減することができる。   In addition, since the restriction on the width of the flexible printed circuit board 4 is relaxed, the flexible printed circuit board 4 having a large size and a large interval between the internal wirings can be used, and crosstalk between the wirings in the flexible printed circuit board 4 is reduced. can do.

また、受光素子２を収容する収容部３Ａを小さくすることができ、その分、その両側の受光素子ホルダ５Ａの取付け面を広く確保することができるため、接着強度を高めることができる。   In addition, the accommodating portion 3A that accommodates the light receiving element 2 can be reduced, and the attachment surfaces of the light receiving element holders 5A on the both sides can be secured accordingly, so that the adhesive strength can be increased.

また、本実施の形態のように、フレキシブルプリント基板４の両側縁を受光素子ホルダ５Ａの凹部５ｂとハウジング１の側面との間の隙間に挿入し、フレキシブルプリント基板４の両側縁をハウジング１の側面に対面させた状態で取付けることによって、小型化、クロストークの低減、受光素子ホルダ５Ａの取付け強度の増大の効果が助長される。   Further, as in the present embodiment, both side edges of the flexible printed circuit board 4 are inserted into a gap between the recess 5b of the light receiving element holder 5A and the side surface of the housing 1, and both side edges of the flexible printed circuit board 4 are connected to the housing 1 side. By mounting in a state of facing the side surface, the effects of downsizing, reduction of crosstalk, and increase in mounting strength of the light receiving element holder 5A are promoted.

なお、本発明を実施する場合、受光素子ホルダ５Ａを接着するハウジング１の取付け面は、必ずしもハウジング側面より突出した台１ａ、１ａにより形成する必要はない。   When the present invention is implemented, the mounting surface of the housing 1 to which the light receiving element holder 5A is bonded is not necessarily formed by the bases 1a and 1a protruding from the side surface of the housing.

本発明による光ピックアップ装置の一実施の形態を示すブロック図である。It is a block diagram which shows one Embodiment of the optical pick-up apparatus by this invention. 本発明による光ピックアップ装置の一実施の形態を示す斜視図である。It is a perspective view which shows one Embodiment of the optical pick-up apparatus by this invention. 本発明の光ピックアップ装置に用いる受光素子ホルダの一例を、ハウジング側から見た斜視図である。It is the perspective view which looked at an example of the light receiving element holder used for the optical pick-up apparatus of this invention from the housing side. 本発明の受光素子ホルダの取付け構造の一例を示す平面図である。It is a top view which shows an example of the attachment structure of the light receiving element holder of this invention. 従来の光ピックアップ装置における受光素子ホルダの取付け構造を示す平面図である。It is a top view which shows the attachment structure of the light receiving element holder in the conventional optical pick-up apparatus.

符号の説明Explanation of symbols

１：ハウジング、１ａ：台、２：受光素子、３Ａ：収容部、３ｘ：壁面、４：フレキシブルプリント基板、５Ａ：受光素子ホルダ、５ｂ：凹部、５ｃ：突出部分、５ｄ：治具にセットする孔、５ｄ：突出部分、６：接続剤、９、１０：レーザー素子、１１、１２：回折格子、１３、１４：プリズム、１５：レンズ、１７：対物レンズ 1: housing, 1a: base, 2: light receiving element, 3A: housing part, 3x: wall surface, 4: flexible printed circuit board, 5A: light receiving element holder, 5b: recess, 5c: protruding part, 5d: set on jig Hole, 5d: protruding portion, 6: connecting agent, 9, 10: laser element, 11, 12: diffraction grating, 13, 14: prism, 15: lens, 17: objective lens

Claims (2)

受光素子ホルダを光ピックアップ装置のハウジングの側面に固着してなる光ピックアップ装置であって、
受光素子ホルダのハウジング対向面に、フレキシブルプリント基板の厚みより深い凹部を設け、
受光素子を取付けたフレキシブルプリント基板を前記受光素子ホルダの凹部に固着し、
前記フレキシブルプリント基板に取付けた受光素子を、前記ハウジングに設けた収容部に収容すると共に、
前記フレキシブルプリント基板を固着した受光素子ホルダの前記凹部の両側の突出部分を、前記ハウジングの側面に接着することにより、前記受光素子ホルダを前記ハウジングに取付けたことを特徴とする光ピックアップ装置。 An optical pickup device in which a light receiving element holder is fixed to a side surface of a housing of an optical pickup device,
A recess deeper than the thickness of the flexible printed circuit board is provided on the housing facing surface of the light receiving element holder,
A flexible printed circuit board to which a light receiving element is attached is fixed to the recess of the light receiving element holder,
While accommodating the light receiving element attached to the flexible printed circuit board in the accommodating portion provided in the housing,
An optical pickup device, wherein the light receiving element holder is attached to the housing by adhering protruding portions on both sides of the concave portion of the light receiving element holder to which the flexible printed board is fixed to the side surface of the housing. 請求項１に記載の光ピックアップ装置において、
前記フレキシブルプリント基板の両側縁を、前記ハウジングの側面に対面させたことを特徴とする光ピックアップ装置。 The optical pickup device according to claim 1,
An optical pickup device, wherein both side edges of the flexible printed circuit board are opposed to side surfaces of the housing.
JP2003345094A 2003-10-02 2003-10-02 Optical pickup device Expired - Fee Related JP3788986B2 (en)

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