JP2003045065A - Liquid crystal end-sealing element and optical head device - Google Patents
Liquid crystal end-sealing element and optical head deviceInfo
- Publication number
- JP2003045065A JP2003045065A JP2001229529A JP2001229529A JP2003045065A JP 2003045065 A JP2003045065 A JP 2003045065A JP 2001229529 A JP2001229529 A JP 2001229529A JP 2001229529 A JP2001229529 A JP 2001229529A JP 2003045065 A JP2003045065 A JP 2003045065A
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- sealing element
- crystal sealing
- head device
- optical head
- 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.)
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- Liquid Crystal (AREA)
- Optical Head (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、液晶封止素子およ
び光ヘッド装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal sealing element and an optical head device.
【０００２】[0002]
【従来の技術】従来の液晶封止素子は、例えば光ヘッド
装置用であれば、図９に側方断面図および図１０に平面
図を示すように、透明基板１０１と透明基板１０２の周
縁部を注入口１０５を除いてシール材１０３にて熱圧着
して、セル構造とされている。次に真空注入法などによ
りセル内部に液晶が注入され液晶層１０４とされた後
に、注入口１０５が封止材を用いて封止され液晶セルが
形成される。2. Description of the Related Art A conventional liquid crystal sealing element for an optical head device, for example, is shown in a side sectional view of FIG. 9 and a plan view of FIG. Is sealed by thermocompression bonding with a sealing material 103 except for the injection port 105 to form a cell structure. Next, after liquid crystal is injected into the cell by a vacuum injection method or the like to form the liquid crystal layer 104, the injection port 105 is sealed with a sealing material to form a liquid crystal cell.
【０００３】[0003]
【発明が解決しようとする課題】外部環境温度の変化な
どにより液晶封止素子の温度が変化する場合、図１１の
従来の液晶封止素子が膨張するときの様子の図、図１２
の従来の液晶封止素子が縮小するときの様子の図に示す
ように、透明基板３０１、３０２、４０１、４０２の間
に挟持された液晶層３０４、４０４とシール材３０３、
４０３の熱膨張係数が異なることにより液晶封止素子
は、膨張（膨らむ）または縮小（へこむ）する。このと
き液晶封止素子内で、液晶層の厚さが場所により異なる
ため、液晶封止素子面内でリタデーション値が変動す
る。特に、光ヘッド装置に用いられる場合は、液晶封止
素子を透過する光の波面が変形して、透過波面変化のう
ち特に倍率成分が変動することにより光ディスク上での
集光特性の劣化が発生する。When the temperature of the liquid crystal sealing element changes due to the change of the external environment temperature, the conventional liquid crystal sealing element of FIG. 11 expands, and FIG.
As shown in the figure when the conventional liquid crystal sealing element is reduced, the liquid crystal layers 304 and 404 and the sealing material 303 sandwiched between the transparent substrates 301, 302, 401 and 402,
The liquid crystal sealing element expands (expands) or contracts (dents) due to the different thermal expansion coefficients of 403. At this time, since the thickness of the liquid crystal layer varies depending on the location within the liquid crystal sealing element, the retardation value varies within the surface of the liquid crystal sealing element. In particular, when used in an optical head device, the wavefront of light passing through the liquid crystal sealing element is deformed, and particularly the magnification component of the transmitted wavefront change fluctuates, causing deterioration of the condensing characteristics on the optical disc. To do.
【０００４】本発明は、上述の問題を解決し、広温度範
囲にわたり液晶封止素子面内のリタデーション値の変動
が小さく、また透過波面変化の倍率成分の変動が小さな
液晶封止素子を得て、この液晶封止素子を光ヘッド装置
搭載し、光ディスク上での集光特性が優れた小型・軽量
の装置を提供することを目的とする。The present invention solves the above-mentioned problems, and obtains a liquid crystal encapsulating element in which the variation of the retardation value in the plane of the liquid crystal encapsulating element is small and the variation of the magnification component of the transmitted wavefront variation is small over a wide temperature range. An object of the present invention is to provide a small-sized and light-weight device having the liquid crystal sealing element mounted on an optical head device and having excellent light condensing characteristics on an optical disk.
【０００５】[0005]
【課題を解決するための手段】本発明は、液晶層を挟持
する複数の透明基板がその周縁部をシール材により封止
されてなる液晶封止素子において、液晶封止素子は液晶
層とともに気泡が挟持されていることを特徴とする液晶
封止素子を提供する。According to the present invention, there is provided a liquid crystal sealing element comprising a plurality of transparent substrates sandwiching a liquid crystal layer, the periphery of which is sealed by a sealing material. A liquid crystal encapsulating element is provided which is characterized by being sandwiched between.
【０００６】また、光源と、光源からの出射光を光記録
媒体上に集光するための対物レンズと、集光され光記録
媒体により反射された出射光を検出する光検出部とを備
える光ヘッド装置において、請求項１、２または３記載
の液晶封止素子が光源と対物レンズとの間の光路中に配
置されていることを特徴とする光ヘッド装置を提供す
る。Further, light having a light source, an objective lens for converging light emitted from the light source on the optical recording medium, and a photodetector for detecting the emitted light condensed and reflected by the optical recording medium. In a head device, there is provided an optical head device, wherein the liquid crystal sealing element according to claim 1, 2 or 3 is arranged in an optical path between a light source and an objective lens.
【０００７】[0007]
【発明の実施の形態】本発明の液晶封止素子の一例を、
図１に側方断面図、図２に平面図を示す。図１および図
２に示す液晶封止素子では、プラスチック、ガラスなど
の透明基板５０１、５０２の対向する基板表面上にポリ
イミドなどの配向膜５０５、５０６を施してある。透明
基板５０１、５０２の厚さは、液晶層５０８の体積膨張
などにより変形が起こりにくいように厚い方が好まし
く、０．５〜１．１ｍｍがよい。BEST MODE FOR CARRYING OUT THE INVENTION One example of the liquid crystal sealing element of the present invention is as follows:
FIG. 1 is a side sectional view and FIG. 2 is a plan view. In the liquid crystal sealing element shown in FIGS. 1 and 2, alignment films 505 and 506 made of polyimide or the like are formed on the surfaces of the transparent substrates 501 and 502 made of plastic or glass which face each other. The thickness of the transparent substrates 501 and 502 is preferably thick so that the liquid crystal layer 508 is not likely to be deformed due to volume expansion or the like, and is preferably 0.5 to 1.1 mm.
【０００８】液晶封止素子の周縁部をアクリル樹脂、エ
ポキシ樹脂などのシール材５０７でシールしセルを形成
後、液晶を注入口５０９から注入し液晶層５０８とし
て、注入口５０９を接着剤などの封止材で封止して液晶
封止素子を作製する。このとき、気泡５１０を液晶とと
もに封止する。封入する気泡は液晶封止素子の図示しな
い有効エリア、すなわち光束の透過する領域の外になる
ようにすることが好ましい。After the peripheral portion of the liquid crystal sealing element is sealed with a sealing material 507 such as acrylic resin or epoxy resin to form a cell, liquid crystal is injected from an injection port 509 to form a liquid crystal layer 508, and the injection port 509 is made of an adhesive or the like. A liquid crystal sealing element is manufactured by sealing with a sealing material. At this time, the bubble 510 is sealed together with the liquid crystal. It is preferable that the air bubbles to be enclosed be located outside an effective area (not shown) of the liquid crystal sealing element, that is, outside the area through which the light flux passes.
【０００９】このように、気泡を液晶とともに封止する
ことにより、外部環境温度の変化などにより液晶封止素
子の温度が変化し、シール材と比べ熱膨張係数の大きな
液晶の体積が大きく変動した場合、気泡の体積が大きく
なったり小さくなったりして液晶層の体積変化分を吸収
する。この結果、液晶封止素子は、図１１、図１２のよ
うに膨らんだりへこんだりするのが低減され、液晶封止
素子の液晶層の厚さが場所により異なることに起因する
液晶層面内のレタデーション値の変化、また透過波面変
化の倍率成分の変動が小さい。As described above, by sealing the air bubbles together with the liquid crystal, the temperature of the liquid crystal sealing element changes due to the change of the external environment temperature, and the volume of the liquid crystal having a large thermal expansion coefficient as compared with the sealing material changes greatly. In this case, the volume of the bubble increases or decreases to absorb the volume change of the liquid crystal layer. As a result, the liquid crystal sealing element is less likely to bulge or dent as shown in FIGS. 11 and 12, and the retardation in the plane of the liquid crystal layer due to the fact that the thickness of the liquid crystal layer of the liquid crystal sealing element varies depending on the location. The change of the value and the change of the magnification component of the transmitted wavefront change are small.
【００１０】気泡の大きさは封止された液晶層５０８の
体積の０．０１倍以上が好ましく、０．５倍以下が有効
エリア、すなわち光束の透過する領域の確保の理由から
好ましい。特に本液晶封止素子を光ヘッドに用いる場合
は、その使用温度範囲から０．０６〜０．１倍が特に好
ましい。また、気泡は空気、乾燥窒素ガス、ヘリウムガ
スなどが使用できる。The size of the bubbles is preferably 0.01 times or more the volume of the sealed liquid crystal layer 508, and 0.5 times or less is preferable in order to secure an effective area, that is, a region through which the light flux passes. In particular, when the present liquid crystal sealing element is used in an optical head, it is particularly preferably 0.06 to 0.1 times the operating temperature range. Air bubbles, dry nitrogen gas, helium gas, or the like can be used as the bubbles.
【００１１】また、封入する気泡の圧力は、１．０１３
×１０５Ｎ／ｍ２以下が好ましく、特に本液晶封止素子
を光ヘッドに用いる場合は、その使用温度範囲から０．
８×１０５Ｎ／ｍ２以下が特に好ましい。The pressure of the air bubbles to be enclosed is 1.013.
X10 5 N / m 2 or less is preferable, and particularly when the present liquid crystal encapsulating element is used for an optical head, it is preferable that the operating temperature range is 0.
It is particularly preferably 8 × 10 5 N / m 2 or less.
【００１２】使用する液晶は、例えばネマチック液晶を
挙げることができる。透明基板表面上に透明電極を形成
し、外部から液晶層に電圧を印加して液晶分子を配向さ
せてもよい。また、透明電極上に基板間導通防止のＳｉ
Ｏ２、ＴｉＯ２、ＺｒＯ２など、またはそれらの混合物
の無機物コートを施してもよい。The liquid crystal used may be, for example, a nematic liquid crystal. A transparent electrode may be formed on the surface of the transparent substrate, and a voltage may be externally applied to the liquid crystal layer to align the liquid crystal molecules. In addition, Si for preventing conduction between the substrates is formed on the transparent electrode.
An inorganic coating of O 2 , TiO 2 , ZrO 2, etc., or mixtures thereof may be applied.
【００１３】図３は本発明の、気泡固定手段が概念的に
形成された液晶封止素子を示す平面図であり、気泡７１
０が液晶封止素子内の周辺部に固定されるように気泡固
定手段７１１を設けたものである。これにより気泡７１
０が外部の振動や衝撃により移動しようとしたときや、
外部環境温度の変化により気泡の大きさが変化したとき
に光学的有効エリアに気泡が移動しないようにできるた
め極めて好ましい。気泡固定手段７１１が段差の場合に
は、段差の高さは、液晶封止素子のセルギャップよりも
小さく、１μｍ以上あるとより好ましい。ここで７０７
はシール材、７０８は液晶層、７０９は注入口である。FIG. 3 is a plan view showing a liquid crystal sealing element in which the air bubble fixing means of the present invention is conceptually formed.
Bubble fixing means 711 is provided so that 0 is fixed to the peripheral portion in the liquid crystal sealing element. This causes bubbles 71
When 0 tries to move due to external vibration or shock,
It is extremely preferable because the bubbles can be prevented from moving to the optically effective area when the size of the bubbles changes due to the change of the external environment temperature. When the bubble fixing means 711 has a step, the height of the step is smaller than the cell gap of the liquid crystal sealing element, and more preferably 1 μm or more. 707 here
Is a sealing material, 708 is a liquid crystal layer, and 709 is an injection port.
【００１４】段差の材料としては特に制約はないが、光
硬化性を付与したポリシラザンなどの有機物／無機物ハ
イブリッドフォトレジストなどは、段差作製の簡便性か
ら極めて好ましい。また、この気泡固定手段として、図
４の例に示すように少なくとも一方の透明基板８０１、
８０２に溝を設けてもよい。溝の深さは１μｍ以上でセ
ルギャップ以下が好ましい。ここで、８０３、８０４は
透明電極、８０５、８０６は配向膜、８０７はシール
材、８０８は液晶層および８１０は気泡である。The material for the step is not particularly limited, but an organic / inorganic hybrid photoresist such as polysilazane imparted with photo-curing property is extremely preferable from the viewpoint of easy production of the step. Further, as this bubble fixing means, as shown in the example of FIG. 4, at least one transparent substrate 801
A groove may be provided in 802. The groove depth is preferably 1 μm or more and less than or equal to the cell gap. Here, 803 and 804 are transparent electrodes, 805 and 806 are alignment films, 807 is a sealing material, 808 is a liquid crystal layer, and 810 is bubbles.
【００１５】また、図５に示す気泡固定手段を設けた液
晶封止素子の他の例のようにシール材９０７以外に上下
の接着部分９２０（隔壁）を設けて気泡９１０の移動を
防止してもよく、その接着部分９２０はシール材９０７
と接触していても離れていてもよい。ここで、９０８は
液晶層、９０９は注入口である。Further, as in another example of the liquid crystal sealing element provided with the bubble fixing means shown in FIG. 5, upper and lower adhesive portions 920 (partition walls) are provided in addition to the sealing material 907 to prevent the movement of the bubbles 910. The adhesive portion 920 may be the sealing material 907.
May be in contact with or remote from. Here, 908 is a liquid crystal layer, and 909 is an injection port.
【００１６】さらに、図６に示す気泡固定手段を設けた
液晶封止素子の例のように、気泡固定手段１０１１を形
成すると液晶セル内部アスペクト比（図中ａ／ｂ）が大
きい液晶封止素子に対しては、気泡１０１０による透過
波面変化の倍率成分の変動抑制効果に加え、アスペクト
比に起因した非点収差成分の発生抑制効果が大きく、特
に液晶セル内部アスペクト比が１．１以上の液晶封止素
子に対しては効果が極めて大きい。ここで、１００３は
シール材、１００４は液晶層および１００５は注入口で
ある。Further, like the example of the liquid crystal sealing element provided with the bubble fixing means shown in FIG. 6, when the bubble fixing means 1011 is formed, the liquid crystal sealing element having a large liquid crystal cell internal aspect ratio (a / b in the figure) is formed. On the other hand, in addition to the effect of suppressing the fluctuation of the magnification component of the transmitted wavefront change due to the bubble 1010, the effect of suppressing the generation of the astigmatism component due to the aspect ratio is large, and in particular, the liquid crystal having the liquid crystal cell internal aspect ratio of 1.1 or more. The effect is extremely large for the sealing element. Here, 1003 is a sealing material, 1004 is a liquid crystal layer, and 1005 is an injection port.
【００１７】図７に本液晶封止素子を組み込んだ光ヘッ
ド装置の一例を示す。半導体レーザ１より出射された光
はコリメートレンズ２により平行光とされ液晶封止素子
３を透過する。電圧制御装置１１を用いて液晶封止素子
３には外部から電圧を印加できる。液晶封止素子３を透
過した光は、偏光ビームスプリッタ４、λ／４板８を透
過後、アクチュエータ６に搭載された対物レンズ５によ
り光記録媒体７に集光される。光記録媒体７で反射され
た光は上記の光路を逆に進み、偏光ビームスプリッタ４
により反射後、集光レンズ９により集光されて光検出器
１０に到達する。このとき、液晶封止素子３に電圧を印
加（実際には、液晶素子を構成する透明基板の表面に形
成された透明電極に電圧を印加）することにより、液晶
封止素子３を透過した光の波面を変化させ、光記録媒体
への集光特性を向上させる。本発明の液晶封止素子を使
用することにより、外部環境温度の変化などによる液晶
封止素子の面内のレタデーション値変動が押さえられ、
集光特性の劣化を防ぐことができる。FIG. 7 shows an example of an optical head device incorporating the present liquid crystal sealing element. The light emitted from the semiconductor laser 1 is collimated by the collimator lens 2 and transmitted through the liquid crystal sealing element 3. A voltage can be externally applied to the liquid crystal sealing element 3 by using the voltage control device 11. The light transmitted through the liquid crystal sealing element 3 is transmitted through the polarization beam splitter 4 and the λ / 4 plate 8 and then focused on the optical recording medium 7 by the objective lens 5 mounted on the actuator 6. The light reflected by the optical recording medium 7 travels in the reverse direction of the above-mentioned optical path, and the polarization beam splitter 4
After being reflected by, the light is condensed by the condenser lens 9 and reaches the photodetector 10. At this time, by applying a voltage to the liquid crystal sealing element 3 (actually, applying a voltage to the transparent electrode formed on the surface of the transparent substrate forming the liquid crystal element), the light transmitted through the liquid crystal sealing element 3 To change the wavefront of to improve the condensing property on the optical recording medium. By using the liquid crystal encapsulation element of the present invention, the retardation value variation in the plane of the liquid crystal encapsulation element due to a change in the external environment temperature is suppressed,
It is possible to prevent the deterioration of the light collecting characteristic.
【００１８】[0018]
【実施例】まず液晶封止素子について、図８を用いて説
明する。厚さ０．５３ｍｍのガラスの透明基板１２０
１、１２０２に、スパッタ法によりＩＴＯからなる透明
電極膜を厚さ３０ｎｍ成膜し、フォトリソグラフィ法お
よびウエットエッチング法により透明電極１２０３、１
２０４を形成した。EXAMPLE First, a liquid crystal sealing element will be described with reference to FIG. Transparent glass substrate 120 having a thickness of 0.53 mm
A transparent electrode film made of ITO having a thickness of 30 nm is formed on each of Nos. 1, 1202 by a sputtering method, and transparent electrodes 1203, 1 by a photolithography method and a wet etching method.
Formed 204.
【００１９】透明電極１２０３、１２０４上には厚さ約
５０ｎｍのポリイミド膜１２０５、１２０６をフレキソ
印刷法により塗布し、焼成した。その後、透明基板１２
０２上に光硬化性を付与したポリシラザンを１μｍ塗布
し、部分的にＵＶ硬化させることにより高さ１μｍの気
泡固定手段１２１１である衝立てを形成した。ポリイミ
ド膜１２０５、１２０６に対して布によるラビングの配
向処理を施した。Polyimide films 1205 and 1206 having a thickness of about 50 nm were applied on the transparent electrodes 1203 and 1204 by a flexographic printing method and baked. Then, the transparent substrate 12
The photo-curable polysilazane was applied on the surface of No. 02 in an amount of 1 μm, and was partially UV-cured to form a screen as a bubble fixing means 1211 having a height of 1 μm. The polyimide films 1205 and 1206 were subjected to rubbing orientation treatment with a cloth.
【００２０】透明基板１２０１にスクリーン印刷法によ
りエポキシ系のシール材１２０７を印刷した。エポキシ
系のシール材１２０７には、所定のセルギャップを維持
するための直径５μｍのファイバスペーサを３％（質量
比換算。以下同じ。）と、透明電極１２０３と１２０４
との間の導電性を得るために表面に導電性コーティング
を施した直径５．５μｍのアクリル球を２％を混合し
た。An epoxy type sealing material 1207 was printed on the transparent substrate 1201 by a screen printing method. The epoxy-based sealing material 1207 has a fiber spacer with a diameter of 5 μm of 3% for maintaining a predetermined cell gap (mass ratio conversion, the same applies below), and the transparent electrodes 1203 and 1204.
2% of 5.5 μm diameter acrylic spheres having a conductive coating on the surface in order to obtain conductivity between and were mixed.
【００２１】透明基板１２０１と１２０２とは位置合わ
せ後に重ね、１７０℃にて、６×１０４Ｎ／ｍ２の圧力
で圧着しセルを形成した。作製したセルに真空注入法に
より常光屈折率および異常光屈折率の差△ｎ＝０．１の
液晶を注入して液晶層１２０８とし、注入口をＵＶ接着
剤にて封止して外形８ｍｍ×１２ｍｍ角、液晶セル内部
のアスペクト比１．４の液晶封止素子を作成した。この
とき、液晶層１２０８とともに液晶層との体積比０．１
倍、圧力０．１×１０５Ｎ／ｍ２の空気の気泡１２１０
を同時に封入した。この液晶封止素子は、電極端子取り
出し部（液晶封止素子の外部に突出した透明基板１２０
２の部分）を介して、外部から液晶層に電圧を印加でき
る。作製された液晶封止素子の透過波面変化の倍率成分
の温度依存性を測定した結果、大きな変動がなく良好な
特性を示した。The transparent substrates 1201 and 1202 were superposed after alignment, and pressed at 170 ° C. under a pressure of 6 × 10 4 N / m 2 to form a cell. A liquid crystal having a difference Δn = 0.1 between the ordinary light refractive index and the extraordinary light refractive index was injected into the prepared cell by a vacuum injection method to form a liquid crystal layer 1208, and the injection port was sealed with a UV adhesive to form an outer shape of 8 mm × A 12 mm square liquid crystal sealing element having an aspect ratio of 1.4 inside the liquid crystal cell was prepared. At this time, the volume ratio of the liquid crystal layer 1208 to the liquid crystal layer is 0.1.
Double air bubbles 1210 with pressure of 0.1 × 10 5 N / m 2
Was encapsulated at the same time. This liquid crystal sealing element has an electrode terminal lead-out portion (the transparent substrate 120 protruding outside the liquid crystal sealing element).
A voltage can be applied to the liquid crystal layer from the outside via the second portion). As a result of measuring the temperature dependence of the magnification component of the transmitted wavefront change of the manufactured liquid crystal encapsulation element, good characteristics were shown without significant fluctuation.
【００２２】作製された液晶封止素子を、図７に示すよ
うに液晶封止素子３として光ヘッド装置に搭載した。半
導体レーザ１からの出射光は、コリメートレンズ２、液
晶封止素子３、偏光ビームスプリッタ４、λ／４板８の
順に透過し、アクチュエータ６に保持された対物レンズ
５を透過して光記録媒体７上に集光される。集光された
光は光記録媒体７により反射され、対物レンズ５、λ／
４板８の順に透過し偏光方向が９０度変化された後、偏
光ビームスプリッタ４により反射され集光レンズ９によ
り光検出器１０に導かれた。液晶封止素子３には電圧制
御装置から電圧が印可されることにより、液晶封止素子
３を透過した光の波面を変化させ、光記録媒体への集光
特性を向上させた。The produced liquid crystal sealing element was mounted on an optical head device as a liquid crystal sealing element 3 as shown in FIG. The emitted light from the semiconductor laser 1 is transmitted through the collimator lens 2, the liquid crystal sealing element 3, the polarization beam splitter 4, and the λ / 4 plate 8 in this order, and also through the objective lens 5 held by the actuator 6, and the optical recording medium. Focused on 7. The condensed light is reflected by the optical recording medium 7, and the objective lens 5, λ /
After passing through the four plates 8 in order and the polarization direction was changed by 90 degrees, the light was reflected by the polarization beam splitter 4 and guided to the photodetector 10 by the condenser lens 9. By applying a voltage from the voltage control device to the liquid crystal sealing element 3, the wavefront of the light transmitted through the liquid crystal sealing element 3 was changed, and the condensing characteristic on the optical recording medium was improved.
【００２３】このとき、光ヘッド装置の外部環境温度を
−２０℃から８５℃まで変化させたが、集光特性に大き
な変化はなく良好な特性を示した。At this time, the external environmental temperature of the optical head device was changed from -20.degree. C. to 85.degree.
【００２４】[0024]
【発明の効果】以上説明したように、本発明の液晶封止
素子においては、液晶とともに気泡を同時に液晶封止素
子内に封入することにより、広温度範囲にわたり液晶封
止素子の面内のレタデーション値の変動が小さな液晶封
止素子を作製でき、またこの液晶封止素子を光ヘッド装
置に搭載することにより、光ディスク上での光の集光特
性が優れた小型・軽量の光ヘッド装置を提供得ることが
できる。As described above, in the liquid crystal sealing element of the present invention, by simultaneously enclosing the liquid crystal and the bubbles in the liquid crystal sealing element, the in-plane retardation of the liquid crystal sealing element over a wide temperature range can be obtained. It is possible to manufacture a liquid crystal encapsulation element with small fluctuation of values, and by mounting this liquid crystal encapsulation element in an optical head device, it is possible to provide a compact and lightweight optical head device with excellent light condensing characteristics on an optical disc. Obtainable.
【図１】本発明の液晶封止素子の一例を示す側方断面
図。FIG. 1 is a side sectional view showing an example of a liquid crystal sealing element of the present invention.
【図２】図１の液晶封止素子の平面図。FIG. 2 is a plan view of the liquid crystal sealing element of FIG.
【図３】本発明の、気泡固定手段が概念的に形成された
液晶封止素子の一例を示す平面図。FIG. 3 is a plan view showing an example of a liquid crystal sealing element in which the air bubble fixing means of the present invention is conceptually formed.
【図４】本発明の、気泡固定手段として溝が設けられた
液晶封止素子の例を示す側面図。FIG. 4 is a side view showing an example of a liquid crystal sealing element provided with a groove as a bubble fixing means of the present invention.
【図５】本発明の、気泡固定手段として隔壁が設けられ
た液晶封止素子の例を示す側面図。FIG. 5 is a side view showing an example of a liquid crystal sealing element in which a partition wall is provided as a bubble fixing means of the present invention.
【図６】本発明の、気泡固定手段が概念的に形成された
液晶封止素子の別の例を示す平面図。FIG. 6 is a plan view showing another example of the liquid crystal sealing element in which the bubble fixing means of the present invention is conceptually formed.
【図７】本発明の光ヘッド装置の一例を示す概念図。FIG. 7 is a conceptual diagram showing an example of an optical head device of the present invention.
【図８】実施例における液晶封止素子の側方断面図。FIG. 8 is a side sectional view of the liquid crystal sealing element in the example.
【図９】従来の液晶封止素子の一例を示す側方断面図。FIG. 9 is a side sectional view showing an example of a conventional liquid crystal sealing element.
【図１０】図９の液晶封止素子の平面図。FIG. 10 is a plan view of the liquid crystal sealing element of FIG.
【図１１】従来の液晶封止素子が環境温度の変化により
膨張した例を示す側方断面図。FIG. 11 is a side sectional view showing an example in which a conventional liquid crystal sealing element expands due to a change in environmental temperature.
【図１２】従来の液晶封止素子が環境温度の変化により
縮小した例を示す側方断面図。FIG. 12 is a side sectional view showing an example in which a conventional liquid crystal sealing element is reduced due to a change in environmental temperature.
１：半導体レーザ
２：コリメートレンズ
３：液晶封止素子
４：偏光ビームスプリッタ
５：対物レンズ
６：アクチュエータ
７：光記録媒体
８：λ／４板
９：集光レンズ
１０：光検出器
１１：電圧制御装置
１０１、１０２、３０１、３０２、４０１、４０２、５
０１、５０２、８０１、８０２、１２０１、１２０２：
透明基板
８０３、８０４、１２０３、１２０４：透明電極
５０５、５０６、８０５、８０６：配向膜
１２０５、１２０６：ポリイミド膜
１０３、３０３、４０３、５０７、７０７、８０７、１
００３、１２０７：シール材
１０４、３０４、４０４、５０８、７０８、８０８、９
０８、１００４、１２０８：液晶層
５１０、７１０、８１０、９１０、１０１０、１２１
０：気泡
７１１、１０１１、１２１１：気泡固定手段
１０５、７０９、９０９、１００５：注入口
９２０：接着部分1: Semiconductor laser 2: Collimator lens 3: Liquid crystal sealing element 4: Polarization beam splitter 5: Objective lens 6: Actuator 7: Optical recording medium 8: λ / 4 plate 9: Condensing lens 10: Photodetector 11: Voltage Control devices 101, 102, 301, 302, 401, 402, 5
01, 502, 801, 802, 1201, 1202:
Transparent substrates 803, 804, 1203, 1204: Transparent electrodes 505, 506, 805, 806: Alignment films 1205, 1206: Polyimide films 103, 303, 403, 507, 707, 807, 1
003, 1207: sealing materials 104, 304, 404, 508, 708, 808, 9
08, 1004, 1208: liquid crystal layers 510, 710, 810, 910, 1010, 121
0: bubbles 711, 1011, 1211: bubble fixing means 105, 709, 909, 1005: injection port 920: adhesive portion
Claims (4)
縁部をシール材により封止されてなる液晶封止素子にお
いて、液晶封止素子は液晶層とともに気泡が挟持されて
いることを特徴とする液晶封止素子。1. A liquid crystal sealing element in which a plurality of transparent substrates holding a liquid crystal layer are sealed at their peripheral edges by a sealing material, wherein the liquid crystal sealing element has air bubbles sandwiched together with the liquid crystal layer. Liquid crystal sealing element.
０１倍以上である請求項１記載の液晶封止素子。2. The volume of the bubbles is less than that of the liquid crystal layer.
The liquid crystal sealing element according to claim 1, which has a ratio of 01 times or more.
されるように気泡固定手段が形成されている請求項１ま
たは２記載の液晶封止素子。3. The liquid crystal sealing element according to claim 1, wherein a bubble fixing means is formed so that the bubbles are fixed to a peripheral portion inside the liquid crystal sealing element.
に集光するための対物レンズと、集光され光記録媒体に
より反射された出射光を検出する光検出部とを備える光
ヘッド装置において、請求項１、２または３記載の液晶
封止素子が光源と対物レンズとの間の光路中に配置され
ていることを特徴とする光ヘッド装置。4. A light comprising a light source, an objective lens for condensing light emitted from the light source on an optical recording medium, and a photodetector for detecting the emitted light condensed and reflected by the optical recording medium. An optical head device, wherein the liquid crystal sealing element according to claim 1, 2 or 3 is arranged in an optical path between a light source and an objective lens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001229529A JP2003045065A (en) | 2001-07-30 | 2001-07-30 | Liquid crystal end-sealing element and optical head device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001229529A JP2003045065A (en) | 2001-07-30 | 2001-07-30 | Liquid crystal end-sealing element and optical head device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2003045065A true JP2003045065A (en) | 2003-02-14 |
| JP2003045065A5 JP2003045065A5 (en) | 2008-07-03 |
Family
ID=19061867
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001229529A Pending JP2003045065A (en) | 2001-07-30 | 2001-07-30 | Liquid crystal end-sealing element and optical head device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2003045065A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005292326A (en) * | 2004-03-31 | 2005-10-20 | Binit:Kk | Liquid crystal element |
| JP2006099946A (en) * | 2004-08-31 | 2006-04-13 | Asahi Glass Co Ltd | Optical head device |
| JP2006099947A (en) * | 2004-08-31 | 2006-04-13 | Asahi Glass Co Ltd | Optical head device |
| JP2006301451A (en) * | 2005-04-22 | 2006-11-02 | Sharp Corp | Liquid crystal display device |
| JP2009244427A (en) * | 2008-03-28 | 2009-10-22 | Citizen Finetech Miyota Co Ltd | Ferroelectric liquid crystal panel and method of manufacturing the same |
| US7835252B2 (en) | 2007-04-12 | 2010-11-16 | Asahi Glass Company, Limited | Optical head apparatus |
| WO2014203596A1 (en) * | 2013-06-18 | 2014-12-24 | 日本電気硝子株式会社 | Liquid crystal lens |
| JP2019117285A (en) * | 2017-12-27 | 2019-07-18 | 京セラ株式会社 | Liquid crystal device |
| JP2019152705A (en) * | 2018-02-28 | 2019-09-12 | 京セラ株式会社 | Liquid crystal device |
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|---|---|---|---|---|
| JP2005292326A (en) * | 2004-03-31 | 2005-10-20 | Binit:Kk | Liquid crystal element |
| JP2006099946A (en) * | 2004-08-31 | 2006-04-13 | Asahi Glass Co Ltd | Optical head device |
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| JP2009244427A (en) * | 2008-03-28 | 2009-10-22 | Citizen Finetech Miyota Co Ltd | Ferroelectric liquid crystal panel and method of manufacturing the same |
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| JP2019117285A (en) * | 2017-12-27 | 2019-07-18 | 京セラ株式会社 | Liquid crystal device |
| JP2019152705A (en) * | 2018-02-28 | 2019-09-12 | 京セラ株式会社 | Liquid crystal device |
| JP7068862B2 (en) | 2018-02-28 | 2022-05-17 | 京セラ株式会社 | Liquid crystal element |
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