JP2000357410A - Resin sheet for illumination cover and illumination cover - Google Patents
Resin sheet for illumination cover and illumination coverInfo
- Publication number
- JP2000357410A JP2000357410A JP2000112122A JP2000112122A JP2000357410A JP 2000357410 A JP2000357410 A JP 2000357410A JP 2000112122 A JP2000112122 A JP 2000112122A JP 2000112122 A JP2000112122 A JP 2000112122A JP 2000357410 A JP2000357410 A JP 2000357410A
- Authority
- JP
- Japan
- Prior art keywords
- average roughness
- resin sheet
- static friction
- lighting
- lighting cover
- 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
- Manufacture Of Macromolecular Shaped Articles (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、点灯・消灯時に照
明器具本体と照明カバーが擦れて生じる摩擦音を防止し
た照明カバー、および、この照明カバーに使用する為の
樹脂シートに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lighting cover for preventing a fricative sound generated when a lighting fixture main body and a lighting cover are rubbed at the time of turning on and off, and a resin sheet used for the lighting cover.
【０００２】[0002]
【従来の技術】照明カバーは、蛍光灯や電熱灯の光を効
率よく透過、拡散させることが必要であり、またデザイ
ンの自由度を持たせることも重要である。このような照
明カバーは、メタクリル樹脂、スチレン系樹脂などを中
心とした透過率の高い樹脂材料に適当な拡散剤を添加
し、グローブ形状など所望形状に成形することにより製
造できる。2. Description of the Related Art Lighting covers need to efficiently transmit and diffuse the light of fluorescent lamps and electric lamps, and it is also important to have design freedom. Such a lighting cover can be manufactured by adding a suitable diffusing agent to a resin material having a high transmittance, such as a methacrylic resin or a styrene-based resin, and molding the resin into a desired shape such as a globe shape.
【０００３】[0003]
【発明が解決しようとしている課題】近年の照明器具
は、虫や埃の進入を防止する為に、照明器具本体との隙
間が小さい状態またはきつい状態で、照明カバーが取り
付けられている。この照明器具本体は金属材料が主体で
あるが、照明カバーは樹脂材料である。したがって、点
灯・消灯時に熱膨張によって伸縮し、照明器具本体と照
明カバーが擦れて点灯・消灯の数分後に３０ｄＢ前後の
摩擦音が発生する。In recent lighting fixtures, in order to prevent insects and dust from entering, a lighting cover is attached with a small gap between the lighting fixture body and a tight state. The lighting fixture body is mainly made of a metal material, while the lighting cover is made of a resin material. Therefore, when the light is turned on and off, it expands and contracts due to thermal expansion, and the lighting fixture body and the illumination cover are rubbed, and a friction sound of about 30 dB is generated several minutes after the light is turned on and off.
【０００４】照明の点灯時は人が活動を始め、または活
動している状況にあるので、摩擦音は気になり難いが、
消灯時は人が就寝し静粛な状態になるので、摩擦音が気
になり易い。この摩擦音は使用者からのクレームの原因
となる場合がある。[0004] At the time of lighting of the light, since a person starts or is in an active state, the friction noise is hardly noticeable,
When the lights are turned off, the person goes to sleep and is in a quiet state. This fricative may cause complaints from the user.
【０００５】本発明は、このような従来技術の課題を解
決する為になされたものであり、点灯・消灯時に照明器
具本体と照明カバーが擦れて生じる摩擦音が防止された
照明カバー、およびこの照明カバーに使用する為の樹脂
シートを提供することを目的とする。SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the related art, and a lighting cover in which a fricative sound generated when a lighting fixture main body and a lighting cover are rubbed at the time of turning on / off is prevented, and this lighting. An object is to provide a resin sheet for use in a cover.
【０００６】[0006]
【課題を解決する為の手段】本発明者らは、摩擦音の発
生原因を追究した結果、照明器具本体へ接触する取付部
における照明カバー表面の静摩擦係数がある特定の条件
を満たすことによって、摩擦音の有無が決まることを見
出し、かつ、その表面に特定の条件を満たす凹凸を形成
することが非常に有効であることを見出し、本発明を完
成するに至った。Means for Solving the Problems The present inventors have investigated the cause of the generation of friction noise, and as a result, the friction coefficient of the surface of the lighting cover in the mounting portion that comes into contact with the lighting fixture main body satisfies a certain condition. The present invention was found to determine the presence or absence of the surface, and found to be very effective to form irregularities satisfying specific conditions on the surface thereof, and completed the present invention.
【０００７】すなわち、本発明の照明カバー用樹脂シー
トは、表面に凹凸を有する樹脂シートにおいて、表面の
凹凸が以下の条件を満たすことを特徴とし、また本発明
の照明カバーは、少なくとも照明器具本体に接触する取
付部の表面の凹凸が以下の条件を満たすことを特徴とす
る。 中心線平均粗さ（Ｒａ）：１〜１５μｍ 十点平均粗さ（Ｒｚ）：１０〜１００μｍ。That is, the resin sheet for a lighting cover according to the present invention is characterized in that the surface of the resin sheet has the following conditions in the resin sheet having the unevenness on the surface. The unevenness on the surface of the mounting portion that comes into contact with the substrate satisfies the following conditions. Center line average roughness (Ra): 1 to 15 μm Ten point average roughness (Rz): 10 to 100 μm.
【０００８】さらに、本発明の照明カバー用樹脂シート
は、表面の静摩擦係数が以下の条件を満たすことを特徴
とし、またさらに本発明の照明カバーは、少なくとも照
明器具本体に接触する取付部の表面の静摩擦係数が以下
の条件を満たすことを特徴とする。 荷重負荷１分後の静摩擦係数 ０.２５以下 荷重負荷１５分後の静摩擦係数 ０.３０以下 ［測定条件：試験片サイズ２５×５０ｍｍ、荷重（滑り
片）５００ｇ、試験速度５ｍｍ／分］。Further, the resin sheet for a lighting cover of the present invention is characterized in that its surface has a coefficient of static friction satisfying the following condition. Further, the lighting cover of the present invention has at least a surface of a mounting portion which comes into contact with a lighting fixture body. Is characterized by satisfying the following condition. Coefficient of static friction after 1 minute of load 0.25 or less Static coefficient of friction after 15 minutes of load 0.30 or less [Measurement conditions: test piece size 25 × 50 mm, load (sliding piece) 500 g, test speed 5 mm / min].
【０００９】この静摩擦係数の測定において、上記した
以外の測定条件は、ＪＩＳ Ｋ−７１２５に準ずる。こ
のような本発明独自の測定条件における静摩擦係数を満
たすことにより、異音が発生せず、非常に優れた効果が
得られる。一方、通常の方法（全ての測定条件をＪＩＳ
Ｋ−７１２５に準拠した測定方法）では、得られる静
摩擦係数と異音（摩擦音）との相関関係は認められなか
った。In the measurement of the coefficient of static friction, measurement conditions other than those described above conform to JIS K-7125. By satisfying the coefficient of static friction under the measurement conditions unique to the present invention, abnormal noise does not occur and a very excellent effect can be obtained. On the other hand, the usual method (all the measurement conditions are JIS
K-7125), no correlation was found between the obtained static friction coefficient and abnormal noise (friction noise).
【００１０】従来技術の説明において述べた通り、照明
カバーの異音は点灯時の数分後、あるいは消灯時の数分
後に発生する。また、異音は照明カバーが取り付けられ
ている状態で発生するものである。本発明においては、
このような点から、静摩擦係数の測定値は、荷重負荷１
分後と、１５分後の２回測定し、両方の値がある一定の
範囲を満たすことを条件としている。実際、樹脂シート
の静摩擦係数は、荷重を負荷してから時間がたつと、そ
の静摩擦係数が、変化していくことを確認できる。本発
明において異音を有効に防止できるのは、その測定条件
が上述のような照明カバーの異音という独自の現象を考
慮した指標となっているからである。As described in the description of the prior art, the abnormal noise of the lighting cover is generated several minutes after lighting or several minutes after turning off the light. The abnormal noise is generated when the illumination cover is attached. In the present invention,
From such a point, the measured value of the coefficient of static friction is expressed as load 1
The measurement is performed twice, one minute and 15 minutes, and the condition is that both values satisfy a certain range. In fact, it can be confirmed that the static friction coefficient of the resin sheet changes with time after a load is applied. In the present invention, abnormal noise can be effectively prevented because the measurement condition is an index in consideration of the unique phenomenon of abnormal noise of the lighting cover as described above.
【００１１】[0011]
【発明の実施の形態】以下、本発明の好適な実施形態に
ついて説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below.
【００１２】本発明の照明カバー用樹脂シートの表面の
凹凸、および、本発明の照明カバーの少なくとも照明器
具本体に接触する取付部の表面の凹凸の中心線平均粗さ
（Ｒａ）は１〜１５μｍであり、好ましくは１〜５μｍ
であり、より好ましくは１〜３μｍである。また、十点
平均粗さ（Ｒｚ）は１０〜１００μｍであり、好ましく
は１０〜７０μｍであり、より好ましくは１０〜４０μ
ｍである。The center line average roughness (Ra) of the unevenness on the surface of the resin sheet for the lighting cover of the present invention and the unevenness on the surface of the mounting portion of the lighting cover of the present invention which is in contact with at least the lighting fixture body is 1 to 15 μm. And preferably 1 to 5 μm
And more preferably 1 to 3 μm. The ten-point average roughness (Rz) is 10 to 100 μm, preferably 10 to 70 μm, more preferably 10 to 40 μm.
m.
【００１３】これら各平均粗さ（Ｒａ）（Ｒｚ）を上記
のように適度に大きくすれば、接触部における静摩擦係
数が小さくなり、摩擦音が発生し難くなる。一方、これ
ら各平均粗さ（Ｒａ）（Ｒｚ）は、無制限に大きくすれ
ば良い訳ではなく、樹脂シートや照明カバーの外観を損
なわないようにする等の理由から、上記のように適度に
小さくすることも必要である。If the average roughnesses (Ra) and (Rz) are appropriately increased as described above, the coefficient of static friction at the contact portion is reduced, and the noise is less likely to be generated. On the other hand, each of these average roughnesses (Ra) and (Rz) is not necessarily limited to an unlimitedly large value. For example, the appearance of the resin sheet or the lighting cover is not impaired. It is also necessary to do.
【００１４】本発明における中心線平均粗さ（Ｒａ）お
よび十点平均粗さ（Ｒｚ）の値は、市販の指針接触式表
面粗さ計を用い、ＪＩＳ Ｂ０６０１に準じて測定した
ものである。ここで、中心線平均粗さ（Ｒａ）を求める
際のカットオフ値および測定長さ、ならびに、十点平均
粗さ（Ｒｚ）を求める際の基準長さは、全てＪＩＳＢ０
６０１で規定される標準値に従っている。The values of the center line average roughness (Ra) and the ten-point average roughness (Rz) in the present invention are measured using a commercially available pointer contact type surface roughness meter according to JIS B0601. Here, the cutoff value and the measurement length when calculating the center line average roughness (Ra), and the reference length when calculating the ten-point average roughness (Rz) are all JISB0.
In accordance with the standard value specified in 601.
【００１５】また、本発明の照明カバー用樹脂シートの
表面の静摩擦係数は、荷重負荷１分後の値が０.２５以
下、荷重負荷１５分後の値が０.３０以下である。この
ような樹脂シートを得るには、樹脂シートの表面に上記
の凹凸を形成することが最も有効である。The coefficient of static friction on the surface of the resin sheet for a lighting cover of the present invention is 0.25 or less after one minute of load, and 0.30 or less after 15 minutes of load. In order to obtain such a resin sheet, it is most effective to form the above irregularities on the surface of the resin sheet.
【００１６】一般に、照明カバーを製造する為の方法と
しては、シートを原料として圧空成形や真空成形を行う
方法、ペレットを原料として射出成形を行う方法などが
知られている。本発明の照明カバーも、シートまたはペ
レットを原料として製造できる。また、本発明の照明カ
バー用樹脂シートは、前者の方法における原料シートと
して使用するものである。Generally, as a method for manufacturing a lighting cover, a method of performing pressure forming or vacuum forming using a sheet as a raw material, a method of performing injection molding using a pellet as a raw material, and the like are known. The lighting cover of the present invention can also be manufactured using sheets or pellets as a raw material. The resin sheet for a lighting cover of the present invention is used as a raw material sheet in the former method.
【００１７】シートを原料として用いる場合は、例え
ば、.凹凸ロールを用いて押し出し成形を行うことに
より本発明の照明カバー用樹脂シートを製造し、これを
照明カバーに成形する方法、.内部に凹凸形成用の微
粒子を添加して凹凸を形成した本発明の照明カバー用樹
脂シートを製造し、これを照明カバーに成形する方法、
.通常のシートを照明カバーに成形する際に、少なく
とも照明器具本体に接触する取付部に相当する部位を粗
した成形型を用いることにより、成形時に凹凸を形成す
る方法、などがある。When a sheet is used as a raw material, for example, a method for producing a resin sheet for a lighting cover of the present invention by performing extrusion molding using a concavo-convex roll, and molding this into a lighting cover; A method of manufacturing a resin sheet for a lighting cover of the present invention in which irregularities are formed by adding fine particles for forming, and molding this into a lighting cover,
When molding a normal sheet into a lighting cover, there is a method of forming irregularities at the time of molding by using a molding die in which at least a portion corresponding to a mounting portion in contact with the lighting fixture body is roughened.
【００１８】方法は、凹凸が大きいロールを用い、押
し出し成形の際に同時に凹凸転写してシートを製造する
ので、シートの凹凸の均一性や再現性に優れている。The method uses a roll having large irregularities and simultaneously transfers the irregularities during extrusion molding to produce a sheet, so that the sheet has excellent uniformity and reproducibility of irregularities.
【００１９】方法は、凹凸形成用の微粒子を添加した
材料を用いるので、方法と比べて凹凸の均一性や再現
性はやや劣るが、照明カバー成形後の凹凸の変形が小さ
い。また、この微粒子は拡散剤をも兼ねる場合もある。In the method, since a material to which fine particles for forming unevenness are added is used, the uniformity and reproducibility of the unevenness are slightly inferior to the method, but the deformation of the unevenness after molding the lighting cover is small. The fine particles may also serve as a diffusing agent.
【００２０】方法は、照明カバー成形前のシート表面
の凹凸の有無によらず、照明カバー成形時に型に設けら
れた凹凸を転写するので、原料シートの自由度、選択幅
が広くなる。In the method, the irregularities provided on the mold at the time of molding the lighting cover are transferred irrespective of the presence or absence of irregularities on the sheet surface before molding the lighting cover, so that the degree of freedom and the selection range of the raw material sheet are widened.
【００２１】また、方法、においては、凹凸を有す
るシートを原料として圧空成形や真空成形などにより照
明カバーを得るので、成形時のシートの延伸により凹凸
が変形しその粗さが若干低下する。ただし、通常は、摩
擦音発生部分である器具本体との接触部（取付部）の延
伸度合いは小さいので、凹凸の変形割合はあまり大きく
ない。Further, in the method, since the lighting cover is obtained by pressure forming or vacuum forming using a sheet having irregularities as a raw material, the irregularities are deformed by stretching of the sheet during molding, and the roughness is slightly reduced. However, since the degree of extension of the contact portion (attachment portion) with the appliance body, which is the friction noise generating portion, is usually small, the deformation ratio of the unevenness is not so large.
【００２２】ペレットを原料として用いる場合は、例え
ば、シートを原料とする場合の方法、と同様の方法
がある。すなわち、'.ペレット内部に凹凸形成用の微
粒子を添加して、これを照明カバーに成形する方法、
'.取付部に相当する部位を粗した成形型を用いること
により成形時に凹凸を形成する方法、などがある。特に
射出成形等は金型を用いるので、方法'が好適であ
る。When pellets are used as a raw material, for example, there is a method similar to the method using a sheet as a raw material. That is, '. A method of adding fine particles for forming irregularities inside the pellet, and molding this into a lighting cover,
'. There is a method of forming irregularities at the time of molding by using a molding die having a roughened portion corresponding to the mounting portion. In particular, since injection molding or the like uses a mold, the method 'is preferable.
【００２３】本発明の照明カバーおよび照明カバー用樹
脂シートを構成する主要材料は、特に限定されないが、
アクリル系樹脂、スチレン系樹脂などが好ましい。その
他にも、ＭＳ樹脂（スチレン・メタクリル酸メチル共重
合体）、塩化ビニル樹脂、ポリカーボネート樹脂なども
使用できる。これらは単独に使用してもよく、品質上支
障のない限り複数種混合してもよい。また、単一層でも
複層でもよく、複層の場合の樹脂は同種でも異種でもよ
い。The main materials constituting the lighting cover and the resin sheet for the lighting cover of the present invention are not particularly limited.
Acrylic resins and styrene resins are preferred. In addition, MS resin (styrene / methyl methacrylate copolymer), vinyl chloride resin, polycarbonate resin and the like can also be used. These may be used alone or in combination of two or more as long as there is no problem in quality. Further, the resin may be a single layer or a multilayer, and in the case of a multilayer, resins may be the same or different.
【００２４】方法の押し出し成形用の凹凸ロールや、
方法、'の照明カバー成形用の型への凹凸の付与方
法としては、例えば、エンボス加工、エッチング加工、
サンドブラスト加工、切削加工などが挙げられる。A method of forming a concavo-convex roll for extrusion molding,
Method, as a method of providing unevenness to the mold for molding the lighting cover of ', for example, embossing, etching,
Sand blasting, cutting and the like can be mentioned.
【００２５】方法、'の凹凸形成用微粒子として
は、例えばアクリル系架橋重合体などの有機微粒子、マ
イカ、タルク、硫酸バリウム、硫酸カルシウム、炭酸カ
ルシウムなどの無機微粒子が挙げられる。その粒径は、
所定の平均粗さ（Ｒａ）、（Ｒｚ）が得られるような粒
径であればよく、所望に応じて適宜決定すればよい。さ
らにその粒径は、静摩擦係数が荷重負荷１分後の値で
０.２５以下、荷重負荷１５分後の値で０.３０以下とな
るような粒径であればよく、所望に応じて適宜決定すれ
ばよい。Examples of the fine particles for forming unevenness in the method (1) include organic fine particles such as an acrylic cross-linked polymer and inorganic fine particles such as mica, talc, barium sulfate, calcium sulfate and calcium carbonate. The particle size is
The particle size may be such that a predetermined average roughness (Ra) or (Rz) is obtained, and may be appropriately determined as desired. Further, the particle size may be a particle size such that the coefficient of static friction is 0.25 or less at a value after 1 minute of the load, and 0.30 or less at a value after 15 minutes of the load. You only have to decide.
【００２６】本発明の照明カバーは、少なくとも照明器
具本体に接触する取付部の表面の凹凸および／または静
摩擦係数に特徴を有するものである。この本体に接触す
る取付部とは、照明器具本体と接合する部位であり、隙
間が小さい状態またはきつい状態では、点灯・消灯時の
熱膨張によって照明器具本体と照明カバーが擦れ、摩擦
音の原因となる部位である。一方、照明カバーの全体的
な形状は特に制限無く、従来より知られる各種形状（グ
ローブ形状など）に成形すればよい。The lighting cover of the present invention is characterized by at least unevenness and / or a coefficient of static friction of the surface of the mounting portion in contact with the lighting fixture body. The mounting part that comes into contact with the main body is the part that joins the lighting fixture main body, and in a state where the gap is small or tight, the lighting fixture main body and the lighting cover rub against each other due to thermal expansion when turning on and off, causing friction noise. Part. On the other hand, the overall shape of the lighting cover is not particularly limited, and may be formed into various conventionally known shapes (such as a glove shape).
【００２７】[0027]
【実施例】以下、実施例により本発明を更に詳細に説明
する。また、各特性の測定・評価は、以下の方法に従い
実施した。The present invention will be described in more detail with reference to the following examples. The measurement and evaluation of each characteristic were performed according to the following methods.
【００２８】（１）中心線平均粗さ（Ｒａ）および十点
平均粗さ（Ｒｚ）：指針接触式表面粗さ計［（株）東京
精密製、商品名サーフコム］を用い、ＪＩＳ Ｂ０６０
１に準じて測定した。(1) Center line average roughness (Ra) and ten-point average roughness (Rz): JIS B060 using a pointer contact type surface roughness meter [trade name: Surfcom, manufactured by Tokyo Seimitsu Co., Ltd.]
It measured according to 1.
【００２９】（２）樹脂シートの静摩擦係数の測定：照
明カバー用アクリル樹脂シートの静摩擦係数測定には、
摩擦測定器［(株)東洋精機製作所製、ＴＲ−２型］を使
用し、試験片サイズ２５×５０ｍｍ、荷重(滑り片)５０
０ｇ、試験速度５ｍｍ／分の測定条件で実施し、荷重負
荷１分後の静摩擦係数と、荷重負荷１５分後の静摩擦係
数とを、それぞれ測定した。なお、これ以外の測定条件
は、ＪＩＳ Ｋ−７１２５に準じた。(2) Measurement of the coefficient of static friction of the resin sheet: To measure the coefficient of static friction of the acrylic resin sheet for the lighting cover,
Using a friction measuring instrument [TR-2 type, manufactured by Toyo Seiki Seisaku-sho, Ltd.], the test piece size was 25 × 50 mm, and the load (sliding piece) was 50.
The test was performed under the measurement conditions of 0 g and a test speed of 5 mm / min, and the static friction coefficient after 1 minute of the load and the static friction coefficient after 15 minutes of the load were measured. The other measurement conditions were in accordance with JIS K-7125.
【００３０】すなわち、照明器具本体における照明カバ
ーと接触する箇所を相手材料とし、その接触する面を摩
擦面とし、摩擦面を上にして相手材料を試験テーブルに
固定した。樹脂シートまたは照明カバーを２５×５０ｍ
ｍのサイズに切断し試験片とし、その一端を滑り片には
り付け、相手材料の上にセットした。ロードセルと滑り
片との間にスプリング定数２±１Ｎ／ｃｍのスプリング
をセットし、荷重（滑り片）の合計重量が５００ｇとな
るように、重りを滑り片の上に乗せて、１分後と１５分
後、試験速度５ｍｍ／分で始動し、最初の最大荷重を静
摩擦力とし、静摩擦係数を求めた。That is, the part of the lighting fixture body that was in contact with the lighting cover was used as a mating material, the surface in contact with the lighting cover was set as a friction surface, and the mating material was fixed on a test table with the friction surface facing up. 25x50m for resin sheet or lighting cover
The test piece was cut to a size of m, and one end of the test piece was attached to a slide piece and set on a mating material. A spring having a spring constant of 2 ± 1 N / cm is set between the load cell and the sliding piece, and a weight is placed on the sliding piece so that the total weight of the load (sliding piece) becomes 500 g. Fifteen minutes later, the test was started at a test speed of 5 mm / min, and the initial maximum load was defined as a static friction force to determine a static friction coefficient.
【００３１】（３）摩擦音に関する評価 ５℃に保たれた静穏な環境下で、照明カバーを照明器具
本体に取り付け、照明器具を点灯させて、１５分間に３
０ｄＢ以上の摩擦音のする回数を測定した。(3) Evaluation of Friction Sound In a calm environment kept at 5 ° C., the lighting cover was attached to the lighting fixture main body, and the lighting fixture was turned on.
The number of fricatives of 0 dB or more was measured.
【００３２】＜実施例１＞重量平均分子量約１０万のア
クリル樹脂８０重量部に、粒径５０〜６０μｍ程度で重
量平均分子量約２００万の凹凸形成用アクリル系微粒子
２０重量部を添加して、２５０℃で押し出し成形を行
い、厚さ約２ｍｍ、中心線平均粗さ（Ｒａ）２.７μ
ｍ、十点平均粗さ（Ｒｚ）３２μｍの照明カバー用アク
リル樹脂シートを得た。このアクリル樹脂シートの静摩
擦係数を測定したところ、荷重負荷１分後で０．１５、
荷重負荷１５分後で０.２４であった。Example 1 To 80 parts by weight of an acrylic resin having a weight average molecular weight of about 100,000, 20 parts by weight of acrylic fine particles for forming concavities and convexities having a particle diameter of about 50 to 60 μm and a weight average molecular weight of about 2 million were added. Extruded at 250 ° C, thickness about 2mm, center line average roughness (Ra) 2.7μ
m, an acrylic resin sheet for a lighting cover having a ten-point average roughness (Rz) of 32 μm was obtained. When the coefficient of static friction of this acrylic resin sheet was measured, it was 0.15,
The value was 0.24 after 15 minutes from the loading.
【００３３】このアクリル樹脂シートを圧空成形して、
本発明の照明カバーを完成した。この照明カバーの照明
器具本体に接触する取付部の表面の中心線平均粗さ（Ｒ
ａ）は２.３μｍ、十点平均粗さ（Ｒｚ）は２５μｍで
あった。その表面の静摩擦係数を測定したところ、荷重
負荷１分後で０.１４、荷重負荷１５分後で０.２１であ
った。The acrylic resin sheet is pressure-formed,
The lighting cover of the present invention has been completed. The center line average roughness (R) of the surface of the mounting portion of the lighting cover that comes into contact with the lighting fixture body
a) was 2.3 μm, and the ten-point average roughness (Rz) was 25 μm. When the coefficient of static friction of the surface was measured, it was 0.14 after 1 minute of the load and 0.21 after 15 minutes of the load.
【００３４】同様にして得られた照明カバーについて、
摩擦音の回数を測定したところ、本実施例においては、
３０ｄＢ以上の摩擦音は一度も発生せず、しかも３０ｄ
Ｂ以下の摩擦音も認められなかった。With respect to the lighting cover obtained in the same manner,
When the number of fricative sounds was measured, in this example,
A fricative noise of 30 dB or more is never generated, and at least 30 dB
No fricative noise of B or less was observed.
【００３５】＜実施例２＞凹凸形成用微粒子として、粒
径１０〜３０μｍ程度のアクリル系架橋重合体を用い、
アクリル樹脂９０重量部、凹凸形成用微粒子１０重量部
の割合で使用したこと以外は、実施例１と同様にして押
し出し成形を行い、厚さ約２ｍｍ、中心線平均粗さ（Ｒ
ａ）２．１μｍ、十点平均粗さ（Ｒｚ）１５μｍの照明
カバー用アクリル樹脂シートを得た。このアクリル樹脂
シートの静摩擦係数を測定したところ、荷重負荷１分後
で０.２０、荷重負荷１５分後で０.２９であった。Example 2 An acrylic crosslinked polymer having a particle size of about 10 to 30 μm was used as the fine particles for forming unevenness.
Extrusion was performed in the same manner as in Example 1 except that 90 parts by weight of the acrylic resin and 10 parts by weight of the fine particles for forming unevenness were used, and a thickness of about 2 mm and a center line average roughness (R
a) An acrylic resin sheet for a lighting cover having 2.1 μm and a ten-point average roughness (Rz) of 15 μm was obtained. When the coefficient of static friction of the acrylic resin sheet was measured, it was 0.20 after 1 minute load and 0.29 after 15 minutes load.
【００３６】そして、このアクリル樹脂シートを用いた
こと以外は、実施例１と同様にして圧空成形して、本発
明の照明カバーを完成した。この照明カバーの照明器具
本体に接触する取付部の表面の中心線平均粗さ（Ｒａ）
は１.６μｍ、十点平均粗さ（Ｒｚ）は１２μｍであっ
た。その表面の静摩擦係数を測定したところ、荷重負荷
１分後で０.１６、荷重負荷１５分後で０.２５であっ
た。Then, except that this acrylic resin sheet was used, the air cover was formed in the same manner as in Example 1 to complete the lighting cover of the present invention. Center line average roughness (Ra) of the surface of the mounting portion of the lighting cover that comes into contact with the lighting fixture body
Was 1.6 μm and the ten-point average roughness (Rz) was 12 μm. When the coefficient of static friction of the surface was measured, it was 0.16 after 1 minute of the load and 0.25 after 15 minutes of the load.
【００３７】この照明カバーについて摩擦音の回数を測
定したところ、本実施例においても３０ｄＢ以上の摩擦
音は一度も発生せず、しかも３０ｄＢ以下の摩擦音も認
められなかった。When the number of fricative noises was measured for this lighting cover, no fricative noise of 30 dB or more was generated even in this embodiment, and no fricative noise of 30 dB or less was recognized.
【００３８】＜比較例１＞重量平均分子量約１０万のア
クリル樹脂を凹凸ロールで押し出し成形して、厚さ約２
ｍｍ、中心線平均粗さ（Ｒａ）０.９μｍ、十点平均粗
さ（Ｒｚ）６μｍの照明カバー用アクリル樹脂シートを
得た。このアクリル樹脂シートの静摩擦係数を測定した
ところ、荷重負荷１分後で０.２３、荷重負荷１５分後
で０.３３であった。<Comparative Example 1> An acrylic resin having a weight-average molecular weight of about 100,000 was extruded with a concavo-convex roll to a thickness of about 2
mm, a center line average roughness (Ra) of 0.9 μm, and a ten-point average roughness (Rz) of 6 μm were obtained. When the coefficient of static friction of this acrylic resin sheet was measured, it was 0.23 after 1 minute load and 0.33 after 15 minutes load.
【００３９】そして、このアクリル樹脂シートを用いた
こと以外は、実施例１と同様にして圧空成形して、照明
カバーを完成した。この照明カバーの照明器具本体に接
触する取付部の表面の中心線平均粗さ（Ｒａ）は０.６
μｍ、十点平均粗さ（Ｒｚ）は４μｍであった。その表
面の静摩擦係数を測定したところ、荷重負荷１分後で
０.２６、荷重負荷１５分後で０.３９であった。Then, except that this acrylic resin sheet was used, a pressure cover was formed in the same manner as in Example 1 to complete a lighting cover. The center line average roughness (Ra) of the surface of the mounting portion of the lighting cover in contact with the lighting fixture body is 0.6.
μm, and the ten-point average roughness (Rz) was 4 μm. When the static friction coefficient of the surface was measured, it was 0.26 one minute after the load and 0.39 after 15 minutes.
【００４０】この照明カバーについて摩擦音の回数を測
定したところ、３０ｄＢ以上の摩擦音は９回発生し、３
０ｄＢ以下の摩擦音も認められた。When the number of fricative noises was measured for this lighting cover, nine fricative noises of 30 dB or more were generated.
Friction noise of 0 dB or less was also observed.
【００４１】各実施例および比較例の結果を、下記表１
にまとめて示す。The results of the examples and comparative examples are shown in Table 1 below.
Are shown together.
【００４２】[0042]
【表１】 [Table 1]
【００４３】[0043]
【発明の効果】以上説明したように、本発明によれば、
照明カバー用樹脂シートの表面の凹凸および照明カバー
の少なくとも照明カバー器具本体へ接触する取付部の表
面の凹凸を特定範囲に変更するだけで、容易に、点灯・
消灯時の摩擦音を防止でき、しかもこの摩擦音防止は持
続性を有する。As described above, according to the present invention,
By simply changing the irregularities on the surface of the resin sheet for the lighting cover and at least the irregularities on the surface of the mounting part of the lighting cover that comes into contact with the body of the lighting cover to a specific range, the lighting and lighting can be easily performed.
Friction noise at the time of turning off can be prevented, and the prevention of the friction noise is persistent.
【００４４】また、本発明によれば、照明カバー用樹脂
シートの少なくともその表面のうち、成形後の照明カバ
ーが照明器具本体に接触する取付部の表面になる予定の
部分の静摩擦係数、および、照明カバーの少なくとも照
明器具本体に接触する取付部の表面の静摩擦係数を特定
範囲にすることによって、容易に、点灯・消灯時の摩擦
音が防止でき、しかもこの摩擦音防止は持続性を有す
る。According to the present invention, the coefficient of static friction of at least the surface of the resin sheet for a lighting cover, which is to be the surface of the mounting portion where the molded lighting cover comes into contact with the lighting fixture main body, and By setting the static friction coefficient of at least the surface of the mounting portion of the lighting cover that comes into contact with the lighting fixture main body to a specific range, it is possible to easily prevent the friction noise at the time of turning on and off, and furthermore, the prevention of the friction noise is durable.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 市川 正明 大阪府門真市門真1048番地 松下電工株式 会社内 (72)発明者 日岡 公 大阪府東大阪市吉田下島１番55号 朝日ナ ショナル照明株式会社内 (72)発明者 村田 裕弘 大阪府豊中市豊南町東４丁目１番14号 朝 日ナショナル照明株式会社内 (72)発明者 千葉 裕治 神奈川県川崎市多摩区登戸3816番地 三菱 レイヨン株式会社東京技術情報センター内 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Masaaki Ichikawa 1048 Kadoma, Kadoma-shi, Osaka Matsushita Electric Works Co., Ltd. Inside the company (72) Koichi Hioka 1-55 Yoshida Shimojima, Higashi-Osaka-shi, Osaka Asahi National Lighting Co., Ltd. Inside the company (72) Inventor Hirohiro Murata 4-1-1-14 Higashi-nanamicho, Toyonaka-shi, Osaka Asahi National Lighting Co., Ltd. (72) Inventor Yuji Chiba 3816 Nototo, Tama-ku, Kawasaki-shi, Kanagawa Prefecture Mitsubishi Rayon Co., Ltd. Inside the information center
Claims (4)
て、表面の凹凸が以下の条件を満たすことを特徴とする
照明カバー用樹脂シート。 中心線平均粗さ（Ｒａ）：１〜１５μｍ 十点平均粗さ（Ｒｚ）：１０〜１００μｍ1. A resin sheet for an illumination cover, wherein the resin sheet has irregularities on the surface, the irregularities on the surface satisfy the following conditions. Center line average roughness (Ra): 1 to 15 μm Ten point average roughness (Rz): 10 to 100 μm
部の表面の凹凸が以下の条件を満たすことを特徴とする
照明カバー。 中心線平均粗さ（Ｒａ）：１〜１５μｍ 十点平均粗さ（Ｒｚ）：１０〜１００μｍ2. A lighting cover, characterized in that at least irregularities on the surface of the mounting portion that comes into contact with the lighting fixture main body satisfy the following conditions. Center line average roughness (Ra): 1 to 15 μm Ten point average roughness (Rz): 10 to 100 μm
有することを特徴とする照明カバー用樹脂シート。 荷重負荷１分後の静摩擦係数 ０.２５以下 荷重負荷１５分後の静摩擦係数 ０.３０以下 ［測定条件：試験片サイズ２５×５０ｍｍ、荷重（滑り
片）５００ｇ、試験速度５ｍｍ／分］3. A lighting cover resin sheet having a surface having a static friction coefficient satisfying the following condition. Static friction coefficient after loading 1 minute 0.25 or less Static friction coefficient after loading 15 minutes 0.30 or less [Measurement conditions: test piece size 25 x 50 mm, load (sliding piece) 500 g, test speed 5 mm / min]
部の表面の静摩擦係数が、以下の条件を満たすことを特
徴とする照明カバー。 荷重負荷１分後の静摩擦係数 ０.２５以下 荷重負荷１５分後の静摩擦係数 ０.３０以下 ［測定条件：試験片サイズ２５×５０ｍｍ、荷重（滑り
片）５００ｇ、試験速度５ｍｍ／分］4. A lighting cover characterized in that at least the coefficient of static friction of the surface of the mounting portion in contact with the lighting fixture main body satisfies the following condition. Static friction coefficient after loading 1 minute 0.25 or less Static friction coefficient after loading 15 minutes 0.30 or less [Measurement conditions: test piece size 25 x 50 mm, load (sliding piece) 500 g, test speed 5 mm / min]
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000112122A JP2000357410A (en) | 1999-04-13 | 2000-04-13 | Resin sheet for illumination cover and illumination cover |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10506299 | 1999-04-13 | ||
| JP11-105062 | 1999-04-13 | ||
| JP2000112122A JP2000357410A (en) | 1999-04-13 | 2000-04-13 | Resin sheet for illumination cover and illumination cover |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000357410A true JP2000357410A (en) | 2000-12-26 |
Family
ID=26445413
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000112122A Pending JP2000357410A (en) | 1999-04-13 | 2000-04-13 | Resin sheet for illumination cover and illumination cover |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000357410A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008139736A (en) * | 2006-12-05 | 2008-06-19 | Sumitomo Chemical Co Ltd | Light diffusing plate |
| NL1034727C2 (en) * | 2006-11-24 | 2010-11-30 | Sumitomo Chemical Co | LIGHT DIFFUSION PLATE, SURFACE EMISSION LIGHT SOURCE DEVICE IN LIQUID CRYSTAL DISPLAY DEVICE. |
| JP2019032999A (en) * | 2017-08-08 | 2019-02-28 | Ｎｅｃライティング株式会社 | LED light source unit |
-
2000
- 2000-04-13 JP JP2000112122A patent/JP2000357410A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL1034727C2 (en) * | 2006-11-24 | 2010-11-30 | Sumitomo Chemical Co | LIGHT DIFFUSION PLATE, SURFACE EMISSION LIGHT SOURCE DEVICE IN LIQUID CRYSTAL DISPLAY DEVICE. |
| KR101430757B1 (en) | 2006-11-24 | 2014-08-18 | 스미또모 가가꾸 가부시끼가이샤 | Light diffuser plate, surface emission light source apparatus and liquid crystal display |
| JP2008139736A (en) * | 2006-12-05 | 2008-06-19 | Sumitomo Chemical Co Ltd | Light diffusing plate |
| JP2019032999A (en) * | 2017-08-08 | 2019-02-28 | Ｎｅｃライティング株式会社 | LED light source unit |
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