JPH06250178A - Surface light source device - Google Patents
Surface light source deviceInfo
- Publication number
- JPH06250178A JPH06250178A JP5038216A JP3821693A JPH06250178A JP H06250178 A JPH06250178 A JP H06250178A JP 5038216 A JP5038216 A JP 5038216A JP 3821693 A JP3821693 A JP 3821693A JP H06250178 A JPH06250178 A JP H06250178A
- Authority
- JP
- Japan
- Prior art keywords
- light source
- rod
- prism lens
- shaped light
- lens film
- 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.)
- Granted
Links
Landscapes
- Optical Elements Other Than Lenses (AREA)
- Liquid Crystal (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は面光源装置、特に液晶テ
レビ，ワードプロセッサ，パーソナルコンピュータ等の
携持型電子機器における液晶表示装置のような非発光表
示装置に実装され、そのバックライト用の光源として用
いられる面光源装置のうちの直下型面光源装置に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is mounted on a surface light source device, particularly a non-light emitting display device such as a liquid crystal display device in a portable electronic device such as a liquid crystal television, a word processor, a personal computer, etc., and a light source for a backlight thereof. Of the surface light source devices used as, the present invention relates to a direct type surface light source device.
【０００２】[0002]
【従来の技術】従来、かかる直下型の面光源装置として
は、例えば開口部を有する筐体内に蛍光ランプ等からな
る棒状光源を配設すると共に開口部に拡散板を配し、さ
らに斑を解消するためにランプと拡散板との間に光制御
フィルム（ＬＣＦ）を介在させたものが知られている
（特公昭５９−８８０９号等参照）。2. Description of the Related Art Conventionally, as such a direct type surface light source device, for example, a rod-shaped light source such as a fluorescent lamp is arranged in a housing having an opening and a diffusing plate is arranged in the opening to further eliminate spots. For this purpose, there is known one in which a light control film (LCF) is interposed between the lamp and the diffusion plate (see Japanese Patent Publication No. 59-8809).
【０００３】[0003]
【発明が解決しようとする課題】ところで、一般にこの
ような面光源装置には、光源からの距離にかかわりなく
面全体に亘り均一な明るさを有していることが要求され
る他、光源の光強度を減じないようにすることが要求さ
れる。また、機器の小型化，低価格化に対応して製作が
容易で実装性に優れていることが要求されている。By the way, in general, such a surface light source device is required to have a uniform brightness over the entire surface regardless of the distance from the light source. It is required not to reduce the light intensity. In addition, it is required to be easy to manufacture and have excellent mountability in response to downsizing and cost reduction of equipment.
【０００４】しかしながら、上述の従来装置にあって
は、明るさの均一性という面では一応の評価が得られる
ものの、光源の光強度の維持という観点においてまだ満
足できないものであった。というのも、光制御フィルム
は、ドット等の光遮断のパターンをフィルム表面に印刷
することにより形成し、これにより光源からの明るい部
分の光を遮ることにより均一な明るさを得るようにして
いるからである。However, in the above-mentioned conventional apparatus, although a tentative evaluation is obtained in terms of uniformity of brightness, it is still unsatisfactory from the viewpoint of maintaining the light intensity of the light source. This is because the light control film is formed by printing a light blocking pattern such as dots on the surface of the film, thereby blocking the light in the bright part from the light source to obtain uniform brightness. Because.
【０００５】本発明の目的は、かかる従来の問題を解消
し、光源の明るさを減ずることなく均一な面輝度が得ら
れ、かつ実装性に優れた面光源装置を提供することにあ
る。SUMMARY OF THE INVENTION An object of the present invention is to solve the above conventional problems and provide a surface light source device which can obtain uniform surface brightness without reducing the brightness of the light source and is excellent in mountability.
【０００６】[0006]
【課題を解決するための手段】上記目的を達成するため
に、本発明の面光源装置は、上面に開口部を有する筐体
内に少なくとも一本の所定径の棒状光源を配設すると共
に、前記開口部を覆うプリズムレンズフィルムを設け、
前記棒状光源と前記プリズムレンズフィルムとの距離を
該プリズムレンズフィルムにおける前記棒状光源の像が
互いに離間しない所定距離に設定したことを特徴とす
る。In order to achieve the above object, in a surface light source device of the present invention, at least one rod-shaped light source having a predetermined diameter is provided in a housing having an opening on the upper surface, and Providing a prism lens film that covers the opening,
The distance between the rod-shaped light source and the prism lens film is set to a predetermined distance such that images of the rod-shaped light source on the prism lens film are not separated from each other.
【０００７】[0007]
【作用】本発明の面光源装置によれば、少なくとも一本
の光源から光が照射されると、プリズムレンズフィルム
には主として２本の棒状光源像が結像される。しかし
て、この２本の光源像が互いに離間しないように棒状光
源とプリズムレンズフィルムとの距離が所定距離に設定
されているので、光強度が低下することなく光源の光強
度が維持された状態で斑のない均一な明るさの面輝度が
得られる。According to the surface light source device of the present invention, when light is emitted from at least one light source, two rod-shaped light source images are mainly formed on the prism lens film. Since the distance between the rod-shaped light source and the prism lens film is set to a predetermined distance so that these two light source images are not separated from each other, the light intensity of the light source is maintained without lowering the light intensity. The surface brightness with uniform brightness can be obtained with.
【０００８】[0008]
【実施例】以下、本発明の実施例を添附図面を参照しつ
つ説明する。Embodiments of the present invention will be described below with reference to the accompanying drawings.
【０００９】図１および図２に本発明の第１実施例を示
す。図において、１０は液晶表示装置の液晶パネルの裏
面側に配設される面光源装置であり、上面に開口部１１
Ａを有する略々方形の筐体１１と、この筐体１１内に配
設された所定の径Ｄを有する線状あるいは棒状の光源１
２と、開口部１１Ａを覆うプリズムレンズフィルム１３
とから主に構成され、必要に応じさらに光拡散シート１
４がプリズムレンズフィルム１３の上面に配設されてい
る。1 and 2 show a first embodiment of the present invention. In the figure, 10 is a surface light source device arranged on the back side of the liquid crystal panel of the liquid crystal display device, and has an opening 11 on the top surface.
A substantially rectangular housing 11 having A, and a linear or rod-shaped light source 1 arranged in the housing 11 and having a predetermined diameter D.
2 and the prism lens film 13 that covers the opening 11A
And a light diffusion sheet 1 if necessary.
4 is provided on the upper surface of the prism lens film 13.
【００１０】筐体１１には開口部１１Ａの周囲に段付棚
部１１Ｂが形成されると共に、棒状光源１２が収容配設
される配設室１１Ｃが形成されている。配設室１１Ｃは
段付棚部１１Ｂと平行な底面部１１Ｄと、棒状光源１２
の両側に平行に位置し４５°の傾斜角を有する斜面部１
１Ｅとで画成されている。そして、この配設室１１Ｃの
内面、すなわち、底面部１１Ｄと斜面部１１Ｅとには、
それぞれ銀蒸発シートあるいはアルミ蒸着シート等から
なる鏡面シート１５が貼着され、それぞれ第１反射面１
５Ａおよび第２反射面１５Ｂを構成している。A stepped shelf 11B is formed around the opening 11A in the housing 11, and an installation chamber 11C is formed in which the rod-shaped light source 12 is housed. The arrangement chamber 11C includes a bottom surface portion 11D parallel to the stepped shelf portion 11B and a rod-shaped light source 12
Slope part 1 which is parallel to both sides of and has an inclination angle of 45 °
It is defined by 1E. Then, on the inner surface of the installation chamber 11C, that is, on the bottom surface portion 11D and the inclined surface portion 11E,
A mirror surface sheet 15 made of a silver evaporation sheet, an aluminum vapor deposition sheet, or the like is attached, and the first reflection surface 1
5A and the second reflecting surface 15B are configured.
【００１１】プリズムレンズフィルム１３は、筐体１１
の段付棚部１１Ｂに両面テープ等により貼着されてお
り、図２に示すように、そのプリズム側を上側にして配
設されている。プリズムレンズフィルム１３は、例えば
その厚みｔが２３０μｍ、頂部ピッチｐが３１μｍ、お
よび各プリズム間の傾斜角度ａが１００度のものを用い
ることができる。The prism lens film 13 has a housing 11
2 is attached to the stepped shelf portion 11B with a double-sided tape or the like, and as shown in FIG. As the prism lens film 13, for example, one having a thickness t of 230 μm, a top pitch p of 31 μm, and an inclination angle a between the prisms of 100 degrees can be used.
【００１２】光拡散シート１４は、プリズムレンズフィ
ルム１３に同じく両面テープ等で貼着され、例えばポリ
エステルあるいはポリカーボネイトのフィルムで構成さ
れ、液晶パネルの照射光を均一とするために拡散性粒子
が混成されたものや、その表面を粗面加工したものが使
用される。The light diffusion sheet 14 is also adhered to the prism lens film 13 with double-sided tape or the like, and is made of, for example, a polyester or polycarbonate film, and diffusible particles are mixed to make the irradiation light of the liquid crystal panel uniform. The one that is used or the one whose surface is roughened is used.
【００１３】棒状光源１２は直径Ｄの蛍光灯等からな
り、前記プリズムレンズフィルム１３との距離Ｈおよび
第２反射面との距離が後述する所定の距離に設定されて
いる。The rod-shaped light source 12 is composed of a fluorescent lamp or the like having a diameter D, and the distance H to the prism lens film 13 and the distance to the second reflecting surface are set to predetermined distances which will be described later.
【００１４】棒状光源１２とプリズムレンズフィルム１
３との距離Ｈと、プリズムレンズフィルム１３の表面に
結像される棒状光源１２の二本の像（ＬＳ−Ｉ，ＬＳ−
ＩＩ）の間の距離Ｌとの間には、その厚みｔ，各プリズ
ム間の傾斜角度ａおよび頂部ピッチｐをパラメータとし
て、図４に示すように、所定の関係が存在する。Rod-shaped light source 12 and prism lens film 1
3 and the two images (LS-I, LS-) of the rod-shaped light source 12 formed on the surface of the prism lens film 13.
With respect to the distance L between II), there is a predetermined relationship as shown in FIG. 4 with the thickness t, the inclination angle a between the prisms, and the top pitch p as parameters.
【００１５】従って、二本の像ＬＳ−Ｉ，ＬＳ−ＩＩが
互いに重畳しない、すなわちＬ＝０のときの棒状光源１
２とプリズムレンズフィルム１３との距離Ｈ0 に両者間
の距離を設定し、さらに棒状光源１２の径をＤとすると
き２Ｄのピッチで棒状光源を並べると、プリズムレンズ
フィルム１３の表面には棒状光源１２の像が重畳かつ離
間することなく密集して並び輝度も高く均一な明るさが
得られることになる。Therefore, the rod-shaped light source 1 when the two images LS-I and LS-II do not overlap each other, that is, when L = 0.
2 is set to the distance H 0 between the prism lens film 13 and the rod-shaped light source 12 and the diameter of the rod-shaped light source 12 is D. When the rod-shaped light sources are arranged at a pitch of 2D, the surface of the prism lens film 13 is rod-shaped. The images of the light sources 12 are densely arranged without being superposed and separated from each other, and high brightness and uniform brightness can be obtained.
【００１６】本発明は、このような原理を利用したもの
であり、第１実施例は棒状光源１２とプリズムレンズフ
ィルム１３との距離を上述の所定距離Ｈ0 に設定すると
共に、棒状光源を複数本並べるのに代え、第２反射面１
５Ｂを利用することにより、一本の棒状光源１２で三本
分に相当する光量を得るようにしたものである。The present invention utilizes such a principle. In the first embodiment, the distance between the rod-shaped light source 12 and the prism lens film 13 is set to the above-mentioned predetermined distance H 0 , and a plurality of rod-shaped light sources are used. Instead of lining up the books, the second reflecting surface 1
By using 5B, one rod-shaped light source 12 can obtain a light amount equivalent to three light sources.
【００１７】従って、第２反射面１５Ｂは上述の関係を
満たすべく、その反射面１５Ｂの中心と棒状光源１２の
中心との距離が径Ｄの２倍離間するよう第２反射面１５
Ｂは設定されている。Therefore, in order to satisfy the above relationship, the second reflecting surface 15B is so arranged that the distance between the center of the reflecting surface 15B and the center of the rod-shaped light source 12 is twice the diameter D.
B is set.
【００１８】上記構成になる本実施例においては、棒状
光源１２から光が照射されると、これと所定距離Ｈ0 離
間して配置されたプリズムレンズフィルム１３の表面に
は、図３（Ｂ）に示すように、直接の像であるＬＳ−Ｉ
およびＬＳ−ＩＩが互いに重畳かつ離間することなく並
んで結像され、同時に、第２反射面１５Ｂの反射像であ
るＬＭ−ＩおよびＬＭ−ＩＩがそれらの両側に同じく互
いに重畳かつ離間することなく並んで結像される。この
場合は、前述のように一本の棒状光源から三本分の光源
が利用でき極めて効率的である。In the present embodiment having the above-mentioned structure, when light is emitted from the rod-shaped light source 12, the surface of the prism lens film 13 arranged at a predetermined distance H 0 from the light source is shown in FIG. LS-I, which is a direct image,
And LS-II are formed side by side without overlapping and separating from each other, and at the same time, LM-I and LM-II, which are reflection images of the second reflecting surface 15B, do not overlap and separate from each other on both sides thereof. Images are formed side by side. In this case, as described above, one rod-shaped light source can be used for three light sources, which is extremely efficient.
【００１９】ちなみに、発明者等の実験によると、Ｄ＝
３．２ｍｍ，長さ２４ｍｍの冷陰極蛍光灯を棒状光源と
し、開口部１１Ａの棒状光源１２と直交する方向の寸法
が約２０ｍｍとした本実施例では、３ｍＡの電流を流し
たとき、５０００ＮＩＴの明るさが得られると共に光拡
散シート１４における面内輝度分布が８２％であった。Incidentally, according to experiments by the inventors, D =
In this embodiment, a cold cathode fluorescent lamp having a length of 3.2 mm and a length of 24 mm is used as a rod-shaped light source, and the dimension of the opening 11A in the direction orthogonal to the rod-shaped light source 12 is about 20 mm. Brightness was obtained and the in-plane luminance distribution on the light diffusion sheet 14 was 82%.
【００２０】なお、上述したように第２反射面１５Ｂの
中心と棒状光源１２の中心との距離が径Ｄの２倍離間
し、プリズムレンズフィルム１３と棒状光源１２との距
離が所定距離Ｈ0 であるときには、プリズムレンズフィ
ルム１３における像が互いに重畳かつ離間することなく
均一な輝度分布が得られるが、上述の距離が径Ｄの２倍
を越えたり、所定距離Ｈ0 を越えると、プリズムレンズ
フィルム１３における像が離間し均一な輝度分布が得ら
れない。しかしながら、上述の第２反射面１５Ｂと棒状
光源１２との距離を径Ｄの２倍以下としたり、所定距離
Ｈ0 以下として、プリズムレンズフィルム１３における
像が多少重畳するようなことがあっても、輝度分布は著
しく損なわれることがないことが実験により確認されて
いる。As described above, the distance between the center of the second reflecting surface 15B and the center of the rod-shaped light source 12 is twice the diameter D, and the distance between the prism lens film 13 and the rod-shaped light source 12 is a predetermined distance H 0. In this case, a uniform luminance distribution can be obtained without the images on the prism lens film 13 overlapping and separating from each other. However, when the above distance exceeds twice the diameter D or exceeds a predetermined distance H 0 , the prism lens The images on the film 13 are separated from each other, and a uniform luminance distribution cannot be obtained. However, even if the distance between the second reflecting surface 15B and the rod-shaped light source 12 is set to be twice the diameter D or less or the predetermined distance H 0 or less, the images on the prism lens film 13 may be slightly overlapped. It has been confirmed by experiments that the luminance distribution is not significantly impaired.
【００２１】ちなみに、上述と同じ条件で開口部１１Ａ
の寸法が約１５ｍｍとなるように第２反射面１５Ｂと棒
状光源１２との距離を２Ｄよりも小さくし像の重畳が生
ずるようにした場合であっても、面内輝度分布が８０％
で５０００ＮＩＴの明るさが得られた。Incidentally, the opening 11A is formed under the same conditions as described above.
Even if the distance between the second reflecting surface 15B and the rod-shaped light source 12 is set to be smaller than 2D so that the dimension becomes about 15 mm, and image superimposition occurs, the in-plane luminance distribution is 80%.
A brightness of 5000 NIT was obtained.
【００２２】かかる観点から、上述の第２反射面１５Ｂ
の傾斜角度は４５°に限られることはなく、プリズムレ
ンズフィルム１３における像の離間が生じない限り、上
述の距離に対応させて変更することが可能である。From this point of view, the second reflecting surface 15B described above is used.
The inclination angle of is not limited to 45 °, and can be changed in accordance with the above distance as long as images are not separated in the prism lens film 13.
【００２３】次に、本発明の第２実施例を図５に基づき
説明する。本実施例は前実施例が一本の直線状の棒状光
源１２を用いたのに対し、Ｗ字型の棒状光源１２1 を用
いた例であり、実質的に四本の直線状の棒状光源１２を
用いることに相当する（本例の場合、Ｗ字型棒状光源の
直線部のピッチは径をＤとするとき６Ｄとなる）。従っ
て、基本的単位構成は第１実施例と同じであり、重複説
明を避けるため同一機能部位には同一符号を付し説明に
かえる。Next, a second embodiment of the present invention will be described with reference to FIG. This embodiment is an example in which a W-shaped rod-shaped light source 12 1 is used in contrast to the linear rod-shaped light source 12 which is used in the previous embodiment, and substantially four linear rod-shaped light sources are used. This is equivalent to using 12 (in the case of this example, the pitch of the linear portions of the W-shaped rod-shaped light source is 6D when the diameter is D). Therefore, the basic unit configuration is the same as that of the first embodiment, and in order to avoid redundant description, the same functional parts will be denoted by the same reference numerals and will not be described.
【００２４】本実施例は光源面を拡大するときに有効で
あり、発明者等の実験によると、Ｄ＝４．８ｍｍ，直線
部長さ１１０ｍｍのＷ字型冷陰極蛍光灯を棒状光源と
し、開口部１１Ａの棒状光源１２1 と直交する方向の寸
法が約８０ｍｍとして５ｍＡの電流を流した場合、７０
００ＮＩＴで面内分布が８０％の面輝度が得られた。This embodiment is effective for enlarging the light source surface, and according to experiments by the inventors, a W-shaped cold cathode fluorescent lamp having D = 4.8 mm and a straight portion length of 110 mm was used as a rod-shaped light source, and an aperture was used. When the dimension of the portion 11A in the direction orthogonal to the rod-shaped light source 12 1 is set to about 80 mm and a current of 5 mA is applied, 70
With 00 NIT, a surface luminance with an in-plane distribution of 80% was obtained.
【００２５】さらに、本発明の第３実施例を図６および
図７を用いて説明する。Further, a third embodiment of the present invention will be described with reference to FIGS. 6 and 7.
【００２６】本実施例は、前述の第１および第２の実施
例がいずれも反射面を利用して棒状光源の相当本数の増
大をはかるようにしたのに対し、プリズムレンズフィル
ムの板数を増やすことにより同様の効果を得るようにし
たものである。In the present embodiment, in contrast to the first and second embodiments described above, the number of rod-shaped light sources is increased by using the reflecting surface, whereas the number of prism lens films is increased. The same effect is obtained by increasing the number.
【００２７】すなわち、図６において前実施例と同一機
能部位には同一符号を付しその異なる点につき説明する
が、１１は筐体であり、本実施例においては反射面用の
斜面部を備えない方形の配設室１１Ｃ0 が形成されてい
る。そして、開口部１１Ａの段付棚部１１Ｂには第１プ
リズムレンズフィルム１３1 が両面テープ等で貼着さ
れ、さらにスペーサ１６により前述の所定距離Ｈ0 離間
されて第２プリズムレンズフィルム１３2 が同じく両面
テープ等で貼着されている。That is, in FIG. 6, the same functional portions as those in the previous embodiment are designated by the same reference numerals and the different points will be described. Reference numeral 11 is a housing, and in this embodiment, a slope portion for a reflecting surface is provided. An empty rectangular chamber 11C 0 is formed. Then, the first prism lens film 13 1 is attached to the stepped shelf 11B of the opening 11A with a double-sided tape or the like, and further the spacer 16 separates the second prism lens film 13 2 by the predetermined distance H 0. It is also attached with double-sided tape.
【００２８】また、棒状光源としてＵ字型の棒状光源１
２2 が用いられているが、このこと自体は必須ではな
い。重要なことは棒状光源１２2 と第１プリズムレンズ
フィルム１３1 との距離Ｈが所定距離ＨD とされている
ことである。A U-shaped rod-shaped light source 1 is used as a rod-shaped light source.
2 2 is used, but this is not mandatory per se. What is important is that the distance H between the rod-shaped light sources 12 2 and the first prism lens film 13 1 is a predetermined distance H D.
【００２９】棒状光源とプリズムレンズフィルムとの距
離Ｈと、プリズムレンズフィルムの表面に結像される棒
状光源の二本の像（ＬＳ−Ｉ，ＬＳ−ＩＩ）の間の距離
Ｌとの間には図４に示すように所定の関係が存在するこ
とは前述の通りである。Between the distance H between the rod-shaped light source and the prism lens film and the distance L between the two images (LS-I, LS-II) of the rod-shaped light source formed on the surface of the prism lens film. As described above, there exists a predetermined relationship as shown in FIG.
【００３０】本実施例では、棒状光源１２2 の径をＤと
するとき、この二本の像ＬＳ−ＩおよびＬＳ−ＩＩの間
の距離がＤに等しくなる所定距離ＨD に上述の距離Ｈを
設定している。[0030] In this embodiment, when the diameter of the rod-shaped light sources 12 2 and D, the distance H distance above the predetermined distance H D equal to D between the image LS-I and LS-II of the two Is set.
【００３１】このようにすることにより、図７に示すよ
うに、棒状光源１２2 の二本の像ＬＳ−ＩおよびＬＳ−
ＩＩが距離Ｄ離間して第１プリズムレンズフィルム１３
1 の表面に結像する。さらに、第１プリズムレンズフィ
ルム１３1 と所定距離Ｈ0 離間されて配設された第２プ
リズムレンズフィルム１３2 の表面には、前述のように
ＬＳ−Ｉの像が互いに重畳かつ離間することなく並んだ
ＬＳ−Ｉ−ＩおよびＬＳ−Ｉ−ＩＩとして、およびＬＳ
−ＩＩの像が同様なＬＳ−ＩＩ−ＩおよびＬＳ−ＩＩ−
ＩＩとして結像することになる。By doing so, as shown in FIG. 7, the two images LS-I and LS- of the rod-shaped light source 12 2 are formed.
II is separated by a distance D and the first prism lens film 13
Image on the surface of 1 . Further, as described above, the images of LS-I do not overlap with each other and are separated from each other on the surface of the second prism lens film 13 2 which is arranged at a predetermined distance H 0 from the first prism lens film 13 1. As side-by-side LS-I-I and LS-I-II, and LS
-II-images are similar LS-II-I and LS-II-
The image will be formed as II.
【００３２】本実施例においては、二本の直線状の棒状
光源が配設されたことに相当するから、結局、第２プリ
ズムレンズフィルム１３2 の表面には棒状光源１２2 の
径Ｄの８倍の広さの面光源が得られることになる。Since this embodiment corresponds to the arrangement of two linear rod-shaped light sources, the diameter D of the rod-shaped light source 12 2 is 8 on the surface of the second prism lens film 13 2. A surface light source that is twice as wide will be obtained.
【００３３】ちなみに、本実施例において発明者等の実
験によると、Ｄ＝４．８ｍｍ，直線部長さ１１０ｍｍの
Ｕ字型冷陰極蛍光灯を棒状光源とし、開口部１１Ａの棒
状光源１２2 と直交する方向の寸法が約４０ｍｍとして
５ｍＡの電流を流した場合、５０００ＮＩＴの面輝度
（面内分布８０％）が得られた。Incidentally, according to an experiment conducted by the inventors in this embodiment, a U-shaped cold cathode fluorescent lamp having D = 4.8 mm and a straight portion length of 110 mm was used as a rod-shaped light source, and was orthogonal to the rod-shaped light source 12 2 of the opening 11A. When a current of 5 mA was applied with the dimension in the direction of rotation of about 40 mm, a surface luminance of 5000 NIT (in-plane distribution 80%) was obtained.
【００３４】なお、上述の実施例はあくまでも例示で、
種々の組合せが可能であり、これ等に制限されるもので
ないことは言うまでもない。例えば、図示はしなかった
が、複数本の直線状棒状光源を並列に配設し、これ等に
前述の所定距離Ｈ0 離間させてプリズムレンズフィルム
を配置したものは本発明の基本的構成として把握でき
る。The above embodiment is merely an example.
It goes without saying that various combinations are possible and are not limited to these. For example, although not shown, a plurality of linear rod-shaped light sources are arranged in parallel, and a prism lens film is arranged at the above-mentioned predetermined distance H 0 apart from each other as a basic configuration of the present invention. I can figure it out.
【００３５】さらに、棒状光源としては冷陰極に限らず
熱陰極の蛍光灯やネオン管等を用いてもよいことは当然
である。また、プリズムレンズフィルムも例示した寸法
のみのものに限らず、同一の機能を示すものであればそ
の名称には左右されるべきものではない。Further, it is a matter of course that the rod-shaped light source is not limited to the cold cathode and may be a hot cathode fluorescent lamp or a neon tube. Further, the prism lens film is not limited to the illustrated size, and the name should not be influenced as long as it has the same function.
【００３６】[0036]
【発明の効果】以上の説明から明らかな通り、本発明の
面光源装置によれば光源の明るさを減ずることなく均一
な面輝度が得られる。As is apparent from the above description, according to the surface light source device of the present invention, uniform surface brightness can be obtained without reducing the brightness of the light source.
【図１】本発明の第１実施例を示し、（Ａ）は平面図、
（Ｂ）は側面図、（Ｃ）は（Ａ）のＡ−Ａ線断面図であ
る。FIG. 1 shows a first embodiment of the present invention, (A) is a plan view,
(B) is a side view and (C) is a sectional view taken along the line AA of (A).
【図２】本発明の第１実施例の分解斜視図である。FIG. 2 is an exploded perspective view of the first embodiment of the present invention.
【図３】本発明の第１実施例の作用を説明するための説
明図である。FIG. 3 is an explanatory diagram for explaining the operation of the first embodiment of the present invention.
【図４】本発明の原理を説明するためのグラフである。FIG. 4 is a graph for explaining the principle of the present invention.
【図５】本発明の第２実施例を示し、（Ａ）は平面図、
（Ｂ）は側面図、（Ｃ）は（Ａ）のＢ−Ｂ線断面図であ
る。FIG. 5 shows a second embodiment of the present invention, (A) is a plan view,
(B) is a side view and (C) is a sectional view taken along line BB of (A).
【図６】本発明の第３実施例を示し、（Ａ）は平面図、
（Ｂ）は側面図、（Ｃ）は（Ａ）のＣ−Ｃ線断面図であ
る。FIG. 6 shows a third embodiment of the present invention, (A) is a plan view,
(B) is a side view, (C) is a sectional view taken along the line CC of (A).
【図７】本発明の第３実施例の作用を説明するための説
明図である。FIG. 7 is an explanatory diagram for explaining the operation of the third embodiment of the present invention.
１０ 面光源装置 １１ 筐体 １２，１２1 ，１２2 棒状光源 １３ プリズムレンズフィルム １４ 光拡散シート10 surface light source device 11 housing 12, 12 1 , 12 2 rod-shaped light source 13 prism lens film 14 light diffusion sheet
Claims (5)
も一本の所定径の棒状光源を配設すると共に、前記開口
部を覆うプリズムレンズフィルムを設け、前記棒状光源
と前記プリズムレンズフィルムとの距離を該プリズムレ
ンズフィルムにおける前記棒状光源の像が互いに離間し
ない所定距離に設定したことを特徴とする面光源装置。1. At least one rod-shaped light source having a predetermined diameter is provided in a housing having an opening on the upper surface, and a prism lens film is provided to cover the opening, and the rod-shaped light source and the prism lens film are provided. A surface light source device, wherein a distance is set to a predetermined distance such that images of the rod-shaped light sources on the prism lens film are not separated from each other.
あって、最外側のプリズムレンズフィルムにおける前記
棒状光源の像が離間しない所定距離に前記各々のプリズ
ムレンズフィルムを配設したことを特徴とする請求項１
に記載の面光源装置。2. A plurality of prism lens films, wherein each prism lens film is arranged at a predetermined distance such that images of the rod-shaped light source on the outermost prism lens film are not separated. Item 1
The surface light source device according to.
反射面を備え、該反射面は前記プリズムレンズフィルム
と平行な第１反射面と、前記棒状光源から両側にその径
の２倍を越えない距離離間され第１反射面に対し所定角
度傾斜した第２反射面とから形成されることを特徴とす
る請求項１に記載の面光源装置。3. The housing is provided with a reflecting surface on an inner surface of a portion where the rod-shaped light source is disposed, and the reflecting surface has a first reflecting surface parallel to the prism lens film, and has a diameter of 2 from both sides of the rod-shaped light source. The surface light source device according to claim 1, wherein the surface light source device is formed of a second reflecting surface that is separated by a distance that does not exceed twice and that is inclined by a predetermined angle with respect to the first reflecting surface.
の２倍を越えないピッチで配置されていることを特徴と
する請求項１に記載の面光源装置。4. The surface light source device according to claim 1, wherein a plurality of the rod-shaped light sources are arranged and arranged at a pitch not exceeding twice the diameter thereof.
さらに拡散フィルムを配設したことを特徴とする請求項
１ないし４のいずれかに記載の面光源装置。5. The surface light source device according to claim 1, further comprising a diffusion film provided on the surface side of the prism lens film.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03821693A JP3267725B2 (en) | 1993-02-26 | 1993-02-26 | Surface light source device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03821693A JP3267725B2 (en) | 1993-02-26 | 1993-02-26 | Surface light source device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06250178A true JPH06250178A (en) | 1994-09-09 |
| JP3267725B2 JP3267725B2 (en) | 2002-03-25 |
Family
ID=12519122
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP03821693A Expired - Fee Related JP3267725B2 (en) | 1993-02-26 | 1993-02-26 | Surface light source device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3267725B2 (en) |
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