JPS649185B2 - - Google Patents
Info
- Publication number
- JPS649185B2 JPS649185B2 JP57233080A JP23308082A JPS649185B2 JP S649185 B2 JPS649185 B2 JP S649185B2 JP 57233080 A JP57233080 A JP 57233080A JP 23308082 A JP23308082 A JP 23308082A JP S649185 B2 JPS649185 B2 JP S649185B2
- Authority
- JP
- Japan
- Prior art keywords
- fresnel lens
- plate
- synthetic resin
- cutting
- thermoplastic synthetic
- 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.)
- Expired
Links
- 229920003002 synthetic resin Polymers 0.000 claims description 10
- 239000000057 synthetic resin Substances 0.000 claims description 10
- 229920001169 thermoplastic Polymers 0.000 claims description 8
- 239000004416 thermosoftening plastic Substances 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 239000004925 Acrylic resin Substances 0.000 description 1
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000004431 polycarbonate resin Substances 0.000 description 1
- 229920005668 polycarbonate resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D11/00—Producing optical elements, e.g. lenses or prisms
- B29D11/00009—Production of simple or compound lenses
- B29D11/00269—Fresnel lenses
Landscapes
- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Ophthalmology & Optometry (AREA)
- Mechanical Engineering (AREA)
- Overhead Projectors And Projection Screens (AREA)
Description
【発明の詳細な説明】
本発明は、背面投影型スクリーン等に用いられ
るフレネルレンズの製造方法に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a Fresnel lens used for rear projection screens and the like.
背面投影型スクリーンは、スクリーンを明るく
均一に観察できるようにするため、光源からの入
射光を観察位置に収束させる同心円状のフレネル
レンズを設けるのが一般的である。ところでこの
ようなフレネルレンズは、合成樹脂板に直接切削
加工して製作する方法あるいは金型に反転したレ
ンズ面を切削加工し、この金型を用いてレンズ面
を転写して製作する方法が知られている。しかし
ながらこのような切削加工は合成樹脂面あるいは
金属面に行なう場合においても、レンズを構成す
る溝のピツチが最小で0.1mm程度が限度であり、
これより小さいピツチにすることは特別な場合を
除き、切削加工することが不可能であつた。この
ようにピツチを小さくすることは、フレネルレン
ズのモアレ現象を軽減させる見地から望まれてい
るが、この要求に十分に応えられない状況であつ
た。 In order to enable bright and uniform viewing of the screen, rear projection screens are generally provided with concentric Fresnel lenses that converge incident light from a light source onto a viewing position. By the way, it is known that Fresnel lenses like this can be manufactured by directly cutting a synthetic resin plate, or by cutting an inverted lens surface into a mold, and then using this mold to transfer the lens surface. It is being However, even when such cutting is performed on synthetic resin surfaces or metal surfaces, the minimum pitch of the grooves that make up the lens is about 0.1 mm.
It has been impossible to make the pitch smaller than this by cutting, except in special cases. Although reducing the pitch in this manner is desired from the standpoint of reducing the moiré phenomenon of Fresnel lenses, it has not been possible to fully meet this demand.
本発明はこのような状況に鑑み、延伸された熱
可塑性合成樹脂の加熱による収縮現象を巧みに利
用してフレネルレンズを簡便に製造しようとする
ものである。すなわち本発明の要旨とするところ
は、縦方向と横方向の延伸倍率が等しくなるよう
に二軸延伸して製作された熱可塑性合成樹脂板
に、フレネルレンズを切削してレンズ面を形成
し、しかるのちこの熱可塑性合成樹脂板を加熱処
理することを特徴とするフレネルレンズの製造方
法にある。 In view of this situation, the present invention attempts to easily manufacture a Fresnel lens by skillfully utilizing the contraction phenomenon caused by heating of a stretched thermoplastic synthetic resin. That is, the gist of the present invention is to form a lens surface by cutting a Fresnel lens into a thermoplastic synthetic resin plate produced by biaxially stretching so that the stretching ratios in the vertical and horizontal directions are equal, The method of manufacturing a Fresnel lens is characterized in that the thermoplastic synthetic resin plate is then heat treated.
以下、本発明を実施例の図面に従つて説明す
る。 The present invention will be described below with reference to drawings of embodiments.
第１図Ａ〜Ｄは本発明の製造工程を示す説明図
であり、以下この工程順に説明する。第１図Ａは
熱可塑性合成樹脂板の元板１Ａを示すもので、こ
の材料としてはアクリル樹脂、ポリカーボネート
樹脂、塩化ビニル樹脂等の熱可塑性合成樹脂が用
いられる。第１図Ｂはこの元板１Ａを縦、横等し
い延伸倍率の二軸方向に加熱延伸して製作された
延伸板１Ｂで、このような延伸板１Ｂは、再加熱
すると延伸していた分が収縮しほぼ元の形状に戻
ることが知られている。 FIGS. 1A to 1D are explanatory diagrams showing the manufacturing process of the present invention, and the process will be explained in the following order. FIG. 1A shows a base plate 1A of a thermoplastic synthetic resin plate, and the material used is a thermoplastic synthetic resin such as acrylic resin, polycarbonate resin, or vinyl chloride resin. Fig. 1B shows a stretched plate 1B produced by heating and stretching this original plate 1A in two axial directions with equal stretching ratios in length and width.When such a stretched plate 1B is reheated, the amount of stretching is removed. It is known to shrink and return to its original shape.
第１図Ｃは、上記の如くして製作された延伸板
１Ｂに同心円状のフレネルレンズ面を形成したフ
レネルレンズ板１Ｃを示している。このようなフ
レネルレンズ面の形成は、切削加工によつて行な
われるが、一般のフレネルレンズを製作する場合
と同様に行なうことができる。第１図Ｄは上記の
フレネルレンズ板１Ｃを加熱処理して得たフレネ
ルレンズ板１Ｄを示している。このように再度加
熱すると、延伸された部分のフレネルレンズ面は
第２図のように収縮されることとなる。このよう
に一旦切削したフレネルレンズ面を収縮させるこ
とは、レンズのピツチを可及的に小さくすること
ができることとなり、モアレ現象防止の見地から
有利となる。またフレネルレンズを直接切削加工
する場合あるいは金型面を切削加工する場合、
往々にして切削時に微小な傷が生ずることがある
が、本発明では切削後に加熱処理するため、この
ような傷を無くすかあるいは著しく軽減させるこ
とができる。 FIG. 1C shows a Fresnel lens plate 1C in which a concentric Fresnel lens surface is formed on the stretched plate 1B produced as described above. Formation of such a Fresnel lens surface is performed by cutting, but it can be performed in the same manner as when manufacturing a general Fresnel lens. FIG. 1D shows a Fresnel lens plate 1D obtained by heat-treating the Fresnel lens plate 1C described above. When heated again in this manner, the stretched portion of the Fresnel lens surface is shrunk as shown in FIG. Shrinking the Fresnel lens surface once cut in this way allows the pitch of the lens to be made as small as possible, which is advantageous from the standpoint of preventing moiré phenomena. In addition, when directly cutting the Fresnel lens or cutting the mold surface,
Although minute scratches often occur during cutting, in the present invention, such scratches can be eliminated or significantly reduced because heat treatment is performed after cutting.
本発明は以上詳述した如き構成からなるもので
あるから、熱可塑性合成樹脂の性質を巧みに利用
して、ピツチが小さいフレネルレンズをも簡単に
製作することができる利点がある。 Since the present invention has the structure as described in detail above, it has the advantage that a Fresnel lens with a small pitch can be easily manufactured by skillfully utilizing the properties of thermoplastic synthetic resin.
第１図Ａ〜Ｄは本発明の製造工程の説明図、第
２図は加熱処理による収縮の状態の説明図であ
る。
１Ａ……元板、１Ｂ……延伸板、１Ｃ……切削
されたフレネルレンズ板、１Ｄ……完成されたフ
レネルレンズ板。
FIGS. 1A to 1D are explanatory diagrams of the manufacturing process of the present invention, and FIG. 2 is an explanatory diagram of the state of shrinkage due to heat treatment. 1A...Original plate, 1B...Stretched plate, 1C...Cut Fresnel lens plate, 1D...Completed Fresnel lens plate.
Claims (1)
に二軸延伸して製作された熱可塑性合成樹脂板
に、フレネルレンズを切削してレンズ面を形成
し、しかるのちこの熱可塑性合成樹脂板を加熱処
理することを特徴とするフレネルレンズの製造方
法。1 A Fresnel lens is cut to form a lens surface on a thermoplastic synthetic resin plate that has been biaxially stretched so that the stretching magnification in the vertical and horizontal directions is equal, and then this thermoplastic synthetic resin plate is A method for producing a Fresnel lens, characterized by heat treatment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57233080A JPS59123633A (en) | 1982-12-28 | 1982-12-28 | Manufacture of fresnel lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57233080A JPS59123633A (en) | 1982-12-28 | 1982-12-28 | Manufacture of fresnel lens |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59123633A JPS59123633A (en) | 1984-07-17 |
| JPS649185B2 true JPS649185B2 (en) | 1989-02-16 |
Family
ID=16949482
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57233080A Granted JPS59123633A (en) | 1982-12-28 | 1982-12-28 | Manufacture of fresnel lens |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59123633A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63180801U (en) * | 1987-05-14 | 1988-11-22 | ||
| JP4933235B2 (en) * | 2006-12-04 | 2012-05-16 | 住友化学株式会社 | Method for producing resin plate having uneven portion on surface |
-
1982
- 1982-12-28 JP JP57233080A patent/JPS59123633A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59123633A (en) | 1984-07-17 |
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