JPH08248210A - Light condensing sheet - Google Patents
Light condensing sheetInfo
- Publication number
- JPH08248210A JPH08248210A JP7047165A JP4716595A JPH08248210A JP H08248210 A JPH08248210 A JP H08248210A JP 7047165 A JP7047165 A JP 7047165A JP 4716595 A JP4716595 A JP 4716595A JP H08248210 A JPH08248210 A JP H08248210A
- Authority
- JP
- Japan
- Prior art keywords
- light
- condensing sheet
- light condensing
- identification means
- sheet
- 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.)
- Pending
Links
Landscapes
- Optical Elements Other Than Lenses (AREA)
- Liquid Crystal (AREA)
- Planar Illumination Modules (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本願発明は、液晶のバックライト
に使用される集光シートに関し、特に異なる半頂角から
なる複数のプリズムを有する集光シートに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light collecting sheet used for a liquid crystal backlight, and more particularly to a light collecting sheet having a plurality of prisms having different half apex angles.
【０００２】[0002]
【従来の技術】液晶を均一な面で照射するための従来の
バックライトには、光源と光源からの光線を出射する導
光板が設けられているが、光源は導光板の側面に配置さ
れているため、導光板に乱反射層を設けても、出射光は
導光板に対して直角方向でなく、光源より遠ざかる方向
に出射する強度分布を有していた。2. Description of the Related Art A conventional backlight for illuminating liquid crystal on a uniform surface is provided with a light source and a light guide plate for emitting light rays from the light source. The light source is arranged on the side surface of the light guide plate. Therefore, even if the diffused reflection layer is provided on the light guide plate, the emitted light has a strength distribution in which the light is emitted not in the direction perpendicular to the light guide plate but in the direction away from the light source.
【０００３】この問題を解決するために、特開平５−２
３２４６６号公報に、断面が異なる半頂角に形成された
プリズムを有する集光シートを導光板の上に配置した発
明が開示されている。なお、同公報では透明シートと呼
称しているが、本願発明においては集光シートと呼称す
る。To solve this problem, Japanese Unexamined Patent Publication (Kokai) No. 5-2
Japanese Patent No. 32466 discloses an invention in which a light-condensing sheet having prisms having different cross-sections and having half-vertical angles is arranged on a light guide plate. It should be noted that although it is called a transparent sheet in the publication, it is called a light-condensing sheet in the present invention.
【０００４】この従来技術のバックライトの図を図１に
示す。同図において、アクリル樹脂からなる導光板１の
側面に光源である冷陰極管２から光を入射させ、点状又
は線状に印刷模様や凹凸模様を設けた乱反射層１ａで反
射させ、集光シート３を介して出射させている。この集
光シート３にはプリズム３ａが設けられ、プリズム３ａ
は平面部３ｂとプリズム３ａの頂点３ｃとを結ぶ法線３
ｄとなす角度、即ち半頂角ａ及びｂが異なる、非対称形
に形成されている。従って、導光板１より出射する光線
は、集光シート３のプリズム３ａにより、法線３ｄの方
向に出射することになるので、図示していない液晶のバ
ックライトとして用いるとき、正視方向に均一な光の強
度分布が得られる。A diagram of this prior art backlight is shown in FIG. In the figure, light is incident on a side surface of a light guide plate 1 made of acrylic resin from a cold cathode tube 2 which is a light source, and is reflected by a diffuse reflection layer 1a provided with a print pattern or a concavo-convex pattern in a dot shape or a linear shape, and condensed. The light is emitted through the sheet 3. The light collecting sheet 3 is provided with a prism 3a, and the prism 3a
Is a normal 3 connecting the flat surface portion 3b and the apex 3c of the prism 3a.
The angle formed with d, that is, the half apex angles a and b are different, and are formed asymmetrically. Therefore, the light rays emitted from the light guide plate 1 are emitted in the direction of the normal line 3d by the prism 3a of the light-condensing sheet 3, and when used as a backlight of a liquid crystal (not shown), they are uniform in the normal viewing direction. A light intensity distribution is obtained.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、前述の
集光シートは下記の如き問題がある。即ち、バックライ
トに要求される性能の一つとして薄型化があり、その結
果、集光シートも薄型化が要求される。現在の通常の集
光シートの厚みは０．２ｍｍ程度であり、プリズムのピ
ッチは約０．０５ｍｍである。プリズムの半頂角ａを２
０°、半頂角ｂを３５°とし、この集光シートを光線が
出射する出射面から見ると、プリズムの傾斜面の幅は１
８ミクロンと３２ミクロンとなる。このように傾斜面の
幅が微細なため、集光シートを観察しても肉眼でその相
違を容易に認識できず、バックライトの組み立ての際
に、半頂角が２０°である傾斜面を光源側に配置させる
べき所、誤って半頂角が３５°である傾斜面を光源側に
配置させて組み立ててしまう恐れがある。このように、
誤って組み立ててしまうと、導光板からの光線は所望の
方向に屈折されず、面光源としてのバックライトの機能
を失することになる。However, the above-mentioned light collecting sheet has the following problems. That is, one of the performances required for the backlight is thinning, and as a result, the light collecting sheet is also required to be thinning. The thickness of a current light-condensing sheet is about 0.2 mm, and the pitch of prisms is about 0.05 mm. The half apex angle a of the prism is 2
Assuming that the condensing sheet is 0 ° and the half apex angle b is 35 °, the width of the inclined surface of the prism is 1 when viewed from the emission surface through which the light rays are emitted.
It becomes 8 microns and 32 microns. Since the width of the inclined surface is so small, the difference cannot be easily recognized with the naked eye even when observing the light-condensing sheet, and when the backlight is assembled, the inclined surface having a half-vertical angle of 20 ° is used. Where the light source side should be arranged, there is a risk that the inclined surface having a half-vertical angle of 35 ° may be mistakenly arranged on the light source side for assembly. in this way,
If assembled incorrectly, the light beam from the light guide plate will not be refracted in the desired direction, and the function of the backlight as a surface light source will be lost.
【０００６】本願発明は上記問題に鑑み、異なる半頂角
を形成した複数のプリズムを有する集光シートをバック
ライトに組み込む際に、正規な位置に確実に且つ容易に
組み込めるようにし、誤配置を防止した集光シートを提
案するものである。In view of the above problems, the present invention allows a light collecting sheet having a plurality of prisms having different half-vertical angles to be incorporated into a backlight securely and easily at a proper position to prevent misalignment. It proposes a light-condensing sheet that has been prevented.
【０００７】[0007]
【課題を解決するための手段】上記課題は本願発明にお
ける、異なる半頂角からなる複数のプリズムを有し、バ
ックライト内の光線の出射特性を制御する集光シートに
おいて、該集光シートを光線の出射面から見て上下及び
左右方向に非対称な形状の、視覚により識別可能な視覚
識別手段若しくは触覚により識別可能な触覚識別手段を
設けたことにより、達成される。SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a light-condensing sheet having a plurality of prisms having different half-vertical angles and controlling the emission characteristics of light rays in a backlight. This is achieved by providing a visually discriminating means or a tactile discriminating means which is asymmetrical in the vertical and horizontal directions as seen from the emission surface of the light ray and which can be discriminated by touch.
【０００８】[0008]
【実施例】本願発明の実施例を図２乃至図１２に基づい
て、詳細に説明する。Embodiments of the present invention will be described in detail with reference to FIGS.
【０００９】図２は本願発明に用いる集光シートの斜視
図であり、図３はその断面図である。集光シート１１は
ポリカーボネートから成形された半頂角が異なる複数の
プリズム１１ａを有している。本実施例においては、従
来技術と異なりプリズム１１ａを上部に設けているが、
上部でも下部でもどちらでもよい。プリズム１１ａと相
対する面である平面部１１ｂを基準として、プリズム１
１ａの頂点１１ｃとを結ぶ法線１１ｄとが、傾斜面１１
ｅとなす角度Ａを半頂角Ａとし、傾斜面１１ｆとなす角
度Ｂを半頂角Ｂとすると、本実施例の場合、半頂角Ａの
方が半頂角Ｂより大きい。この結果、平面部１１ｂに入
射した光が出射する光は、図の左方に強度分布が強くな
る。従って、右方に強度分布が強い光が平面部１１ｂに
入射したときは、左右に均一な強度分布の光が出射され
る。FIG. 2 is a perspective view of a light collecting sheet used in the present invention, and FIG. 3 is a sectional view thereof. The light collecting sheet 11 has a plurality of prisms 11a formed of polycarbonate and having different half apex angles. In this embodiment, unlike the prior art, the prism 11a is provided on the upper part,
Either the upper part or the lower part may be used. With reference to the flat surface portion 11b which is a surface facing the prism 11a, the prism 1
The normal 11d connecting the apex 11c of 1a to the inclined surface 11
When the angle A formed with e is a half-vertical angle A and the angle B formed with the inclined surface 11f is a half-vertical angle B, the half-vertical angle A is larger than the half-vertical angle B in the present embodiment. As a result, the light emitted from the light incident on the flat surface portion 11b has a strong intensity distribution on the left side of the drawing. Therefore, when light having a strong intensity distribution to the right enters the flat surface portion 11b, light having a uniform intensity distribution is emitted to the left and right.
【００１０】しかし、集光シート１１の上下左右の位置
及び表裏を誤って配置すると、全く不適切な方向に出射
されることになるので、正規な位置に確実に配置できる
必要がある。このために、本願発明の集光シートは図４
乃至図１２に示す如く、視覚により識別可能な視覚識別
手段、若しくは手による触覚により識別可能な触覚識別
手段を設けた。However, if the top, bottom, left and right positions and the front and back of the light collecting sheet 11 are erroneously arranged, the light will be emitted in a completely inappropriate direction, so it is necessary to surely arrange the light collecting sheet 11 at a proper position. For this reason, the condensing sheet of the present invention is shown in FIG.
As shown in FIGS. 12 to 12, a visual identification means capable of visual identification or a tactile identification means capable of tactile identification with a hand is provided.
【００１１】図４は、視覚識別手段の１例として複数の
文字と数字を設けた集光シートを光線の出射面から見た
図であり、集光シート２１には文字と数字を配列した視
覚識別手段２１ａが設けられている。視覚識別手段２１
ａとしては、文字や数字に限らず、記号や模様でもよい
が、バックライトの視覚に影響の少ない部分が望まし
く、例えば上部に液晶の画素が存在しない周辺部が望ま
しい。文字、数字、記号若しくは模様は、印刷により設
けてもよいし、集光シートの金型に直接刻印してもよ
い。FIG. 4 is a view of a light-collecting sheet provided with a plurality of characters and numbers as an example of the visual identification means, as seen from the emission surface of the light beam. Identification means 21a is provided. Visual identification means 21
The symbol a is not limited to letters and numbers, but may be a symbol or a pattern, but a portion that has little effect on the visual sense of the backlight is desirable, and for example, a peripheral portion where liquid crystal pixels do not exist in the upper portion is desirable. The letters, numbers, symbols or patterns may be provided by printing, or may be directly stamped on the mold of the light collecting sheet.
【００１２】要は、バックライトの組立作業者が集光シ
ートの上下左右及び表裏を誤りなく判断し、正規な位置
に配置できる形態であれば、どのようなものでもよい。The point is that any structure may be used as long as the operator assembling the backlight can correctly determine the top, bottom, left, and right and the front and back of the light-condensing sheet and arrange them in the proper positions.
【００１３】図５は集光シート２１の上下を誤って配置
した図であり、図６は集光シート２１を左右に反転し表
裏を誤った図である。共に、異常な方向に光が出射する
ことになる。FIG. 5 is a view in which the top and bottom of the light-condensing sheet 21 are erroneously arranged, and FIG. 6 is a view in which the light-condensing sheet 21 is flipped left and right and the front and back are erroneous. In both cases, light is emitted in an abnormal direction.
【００１４】図７は視覚識別手段の１例として一つの文
字を切り抜いた集光シートを光線の出射面から見た図で
あり、集光シート３１には視覚識別手段としてのＰなる
文字３１ａを金型等により切り抜いている。文字はＰに
限定されるものでなく、どのような文字、数字、記号若
しくは模様も使用できるが、例えば、Ａ，Ｃ，Ｄ，Ｅ，
Ｈ，Ｉ，Ｋ，Ｍ，Ｎ，Ｏ，Ｓ，Ｔ，Ｕ，Ｖ，Ｗ，Ｘ，
Ｙ，Ｚ若しくは１，３，６，８，９，０の如き、線対称
及び点対称の文字、並びに姿勢によって紛らわしい文字
は誤り易いので、用いないほうがよい。また、切り抜く
幅はあまり大きいと光学的影響が出ることがあるので、
識別可能で加工可能な最小限の幅にすることが好まし
い。FIG. 7 is a view of a light-collecting sheet, in which one character is cut out, as seen from the light emitting surface, as an example of the visual identification means. The light-condensing sheet 31 has a character 31a P as the visual identification means. It is cut out with a mold. The letter is not limited to P, and any letter, number, symbol or pattern can be used. For example, A, C, D, E,
H, I, K, M, N, O, S, T, U, V, W, X,
Characters such as Y, Z or 1,3,6,8,9,0 having line symmetry and point symmetry and characters confusing depending on the posture are apt to be erroneous, and thus should not be used. Also, if the width to be cut out is too large, optical effects may occur, so
It is preferable to have a minimum width that can be identified and processed.
【００１５】図８は視覚識別手段の１例として模様を用
いた集光シートを光線の出射面から見た図であり、集光
シート４１に模様４１ａをエンボス加工等により設けた
ものである。この模様を４隅の内の中で事前に規定した
１隅に設けておけば、正規な位置の識別が容易にでき
る。FIG. 8 is a view of a light-condensing sheet using a pattern as an example of the visual identification means as seen from the light emitting surface, and the light-condensing sheet 41 is provided with a pattern 41a by embossing or the like. If this pattern is provided in one of the four corners defined in advance, the regular position can be easily identified.
【００１６】図９は視覚識別手段の１例として外形を非
対称に形成した集光シートを光線の出射面から見た図で
あり、集光シート５１に凸部５１ａと凹部５１ｂが設け
てあるので、組立作業者が事前に正規の状態を認識して
おれば、組立時に誤ることがない。なお、外形形状はど
のようなものでもよいが、上下左右及び表裏の判別がで
きる形状である必要がある。また、本実施例は触覚識別
手段として用いることもできる。FIG. 9 is a view of a light-condensing sheet having an asymmetrical outer shape as seen from the light emitting surface as an example of the visual identification means. Since the light-condensing sheet 51 is provided with convex portions 51a and concave portions 51b. As long as the assembler recognizes the proper state in advance, there will be no mistake in the assembly. It should be noted that the outer shape may be any shape, but it is necessary that the outer shape be capable of discriminating between upper, lower, left, right and front. Further, this embodiment can also be used as a tactile identification means.
【００１７】図１０は視覚識別手段及び触覚識別手段の
双方に用いることができる１例として複数の突起部を設
けた集光シートを光線の出射面から見た図であり、集光
シート６１には突起部６１ａが設けられている。従っ
て、視認してもよいし、手による触覚によっても集光シ
ートを正規な位置に配置することができる。なお、図の
ような突起部に限定されるものではないが、上下左右及
び表裏の判別ができる位置に設ける必要がある。FIG. 10 is a view of a light-condensing sheet provided with a plurality of protrusions as an example which can be used for both the visual discriminating means and the tactile discriminating means, as seen from the light emitting surface. Is provided with a protrusion 61a. Therefore, the light-condensing sheet can be arranged at a proper position by visual recognition or by touch with a hand. It should be noted that the protrusion is not limited to the one shown in the drawing, but it is necessary to provide it at a position where it is possible to discriminate between the upper, lower, left, right, and front and back.
【００１８】図１１は主として触覚識別手段として用い
ることができる１例として複数の突起部を設けた集光シ
ートを光線の出射面から見た図であり、集光シート７１
の側面には複数の突起部７１ａが設けられている。従っ
て、視認しなくても手による触覚により集光シートを正
規な位置に配置することができる。前述と同様に、上下
左右及び表裏の判別ができる位置に設ける必要がある。
なお、突起部に代えて凹部にしてもよい。FIG. 11 is a view of a light-condensing sheet provided with a plurality of projections as an example which can be mainly used as a tactile-sense identifying means, as seen from the light-emission surface.
A plurality of protrusions 71a are provided on the side surface of the. Therefore, the light-condensing sheet can be arranged at a proper position by a tactile sensation with a hand without visually recognizing it. Similar to the above, it is necessary to provide it at a position where it is possible to discriminate between the top, bottom, left, right and front and back.
Note that a recess may be used instead of the protrusion.
【００１９】図１２は集光シートの平面部若しくはプリ
ズム面に傷が付いたり、埃が付着したりするのを防止す
るために設けた保護フィルムに、視覚識別手段を設けた
斜視図である。即ち、集光シート８１に付着した保護フ
ィルム８２には記号及び文字からなる視覚識別手段８２
ａが設けられているので、このまま組み立てれば誤りな
く正規な位置に組み立てでき、組立後に保護フィルム８
２を剥がしてしまえば、図７の如き光学的影響がない。FIG. 12 is a perspective view in which a visual identification means is provided on a protective film provided to prevent scratches or dust from adhering to the flat surface portion or prism surface of the light collecting sheet. That is, the protective film 82 attached to the light condensing sheet 81 has a visual identification means 82 composed of symbols and characters.
Since a is provided, if it is assembled as it is, it can be assembled in a proper position without error, and after the assembly, the protective film 8
If 2 is peeled off, there is no optical influence as shown in FIG.
【００２０】以上説明した各実施例の如く、集光シート
を光線の出射面から見て、視覚識別手段若しくは触覚識
別手段を上下及び左右に非対称な位置に配置すれば、上
下及び左右を誤って配置することがなく、また表裏を誤
ることもない。If the visual identification means or the tactile identification means are arranged in vertically and horizontally asymmetrical positions when the light-condensing sheet is viewed from the emission surface of the light rays as in each of the embodiments described above, the vertical and horizontal directions will be erroneous. There is no need to place it, and there is no mistake on the front and back.
【００２１】[0021]
【発明の効果】本願発明の請求項１〜５における集光シ
ートによれば、集光シートをバックライトに組み込む際
に、微細なプリズム傾斜面の相違やプリズムの半頂角の
相違を組立作業者が確認しなくても、集光シート若しく
は保護フィルムに設けられた視覚識別手段若しくは触覚
識別手段により、集光シートの上下左右及び表裏を容易
に識別できるので、集光シートを誤って配置することが
なくなると共に、配置作業の時間短縮がなされる。According to the light-condensing sheet according to the first to fifth aspects of the present invention, when assembling the light-condensing sheet into a backlight, a fine prism inclined surface difference and a prism half-vertical angle difference are assembled. Even if the person does not confirm it, the light condensing sheet can be easily identified by the visual identification means or the tactile identification means provided on the light condensing sheet or the protective film, so that the light condensing sheet is erroneously placed. And the time required for the placement work is shortened.
【図１】従来技術のバックライトの図である。FIG. 1 is a diagram of a prior art backlight.
【図２】本願発明に用いる集光シートの斜視図である。FIG. 2 is a perspective view of a light collecting sheet used in the present invention.
【図３】本願発明に用いる集光シートの断面図である。FIG. 3 is a cross-sectional view of a light collecting sheet used in the present invention.
【図４】複数の文字と数字を設けた集光シートを光線の
出射面から見た図である。FIG. 4 is a view of a light-condensing sheet provided with a plurality of letters and numbers as seen from a light emitting surface.
【図５】図４の集光シートの上下を誤って配置した図で
ある。5 is a diagram in which the top and bottom of the light collecting sheet in FIG. 4 are erroneously arranged.
【図６】図４の集光シートの左右を反転し表裏を誤って
配置した図である。FIG. 6 is a diagram in which the light condensing sheet of FIG.
【図７】一つの文字を切り抜いた集光シートを光線の出
射面から見た図である。FIG. 7 is a view of a light-condensing sheet in which one character is cut out as seen from a light emitting surface.
【図８】模様を用いた集光シートを光線の出射面から見
た図である。FIG. 8 is a view of a light-collecting sheet having a pattern as seen from a light emitting surface.
【図９】外形を非対称に形成した集光シートを光線の出
射面から見た図である。FIG. 9 is a view of a light-condensing sheet having an asymmetric outer shape as seen from a light ray emission surface.
【図１０】複数の突起部を設けた集光シートを光線の出
射面から見た図である。FIG. 10 is a view of a light-condensing sheet provided with a plurality of protrusions as seen from a light ray emission surface.
【図１１】複数の突起部を設けた集光シートを光線の出
射面から見た図である。FIG. 11 is a diagram of a light-condensing sheet provided with a plurality of protrusions as seen from a light ray emission surface.
【図１２】保護フィルムに、視覚識別手段を設けた斜視
図である。FIG. 12 is a perspective view of a protective film provided with visual identification means.
【符号の説明】 １ 導光板 ２ 冷陰極管 ３，１１，２１，３１，４１，５１，６１，７１，８１
集光シート ３ａ，１１ａ プリズム ２１ａ，８２ａ 視覚識別手段 ３１ａ 文字 ４１ａ 模様 ５１ａ 凸部 ６１ａ，７１ａ 突起部 ８２ 保護フィルム[Explanation of reference numerals] 1 light guide plate 2 cold cathode tube 3, 11, 21, 31, 41, 51, 61, 71, 81
Light condensing sheet 3a, 11a Prism 21a, 82a Visual identification means 31a Character 41a Pattern 51a Convex part 61a, 71a Protruding part 82 Protective film
Claims (5)
有し、バックライト内の光線の出射特性を制御する集光
シートにおいて、 該集光シートを光線の出射面から見て上下及び左右方向
に非対称な形状の、視覚により識別可能な視覚識別手段
若しくは触覚により識別可能な触覚識別手段を設けたこ
とを特徴とする集光シート。1. A light-condensing sheet that has a plurality of prisms having different half-vertical angles and controls the emission characteristics of light rays in a backlight. A light-condensing sheet, characterized in that an asymmetrically-shaped visual identification means or a tactile identification means capable of tactile identification is provided.
若しくは模様であることを特徴とする請求項１に記載の
集光シート。2. The light collecting sheet according to claim 1, wherein the visual identification means is a character, a number, a symbol, or a pattern.
外形部であることを特徴とする請求項１に記載の集光シ
ート。3. The light condensing sheet according to claim 1, wherein the visual identification means is an outer shape portion of the light condensing sheet.
であることを特徴とする請求項１に記載の集光シート。4. The light condensing sheet according to claim 1, wherein the tactile identification means is a convex portion or a concave portion.
手段が、集光シートに付着した保護フィルムに設けられ
ていることを特徴とする請求項１に記載の集光シート。5. The light collecting sheet according to claim 1, wherein the visual identification means or the tactile identification means is provided on a protective film attached to the light collecting sheet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7047165A JPH08248210A (en) | 1995-03-07 | 1995-03-07 | Light condensing sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7047165A JPH08248210A (en) | 1995-03-07 | 1995-03-07 | Light condensing sheet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08248210A true JPH08248210A (en) | 1996-09-27 |
Family
ID=12767467
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7047165A Pending JPH08248210A (en) | 1995-03-07 | 1995-03-07 | Light condensing sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08248210A (en) |
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