JPS6055810B2 - Method of manufacturing optical low-pass filter - Google Patents
Method of manufacturing optical low-pass filterInfo
- Publication number
- JPS6055810B2 JPS6055810B2 JP16574080A JP16574080A JPS6055810B2 JP S6055810 B2 JPS6055810 B2 JP S6055810B2 JP 16574080 A JP16574080 A JP 16574080A JP 16574080 A JP16574080 A JP 16574080A JP S6055810 B2 JPS6055810 B2 JP S6055810B2
- Authority
- JP
- Japan
- Prior art keywords
- pass filter
- optical low
- shape
- stamper
- curved surface
- 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
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/42—Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect
- G02B27/46—Systems using spatial filters
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Optical Elements Other Than Lenses (AREA)
- Diffracting Gratings Or Hologram Optical Elements (AREA)
Description
【発明の詳細な説明】
本発明は光学的低域フィルタの製造方法に係り、特に
山部及び谷部を曲面とされた断面形状の光学的低域フィ
ルタを、曲面を有しない形状の成形型を使用してプレス
成形して得る光学的低域フィルタの製造方法を提供する
ことを目的とする。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing an optical low-pass filter, and in particular, an optical low-pass filter having a cross-sectional shape with curved peaks and troughs is manufactured using a mold having no curved surface. An object of the present invention is to provide a method for manufacturing an optical low-pass filter obtained by press-molding using.
本出願人は本出願と同日付で「光学的低域フィルタ」
を出願した。第１図Ａ、Ｂはこの光学的低域フィルタを
示し、第２図はこの光学的低域フィルタを組込んだ撮像
管光学系の状態を示す。 第１図Ａ、Ｂに示す光学的低
域フィルタ１は、断面形状が丸みを帯びた山形の柱状ブ
ロックが並傾斜した一方向傾斜平面２ａと逆方向に角度
α傾斜した逆方向傾斜平面２ｂとが互いに間をおいて交
互に配され、隣り合う傾斜平面２ａ、２ｂ間を継ぎ凸状
面となつて山部を形成する曲面２ｃと凹状面となつて谷
部を形成する曲面２ａとにより定まる形状としてある。
第１図Ｂ中、３は傾斜平面２ａ、２ｂに対応する区間、
４は凸状曲面２ｃに対応する区間、５は凹状曲面２ｄに
対応する区間を示す。 第２図は上記の光学的低域フィ
ルタ１の１ピット部分での光路の状態を示す。On the same date as this application, the applicant has filed an application for "Optical low-pass filter".
has been applied for. 1A and 1B show this optical low-pass filter, and FIG. 2 shows the state of the image pickup tube optical system incorporating this optical low-pass filter. The optical low-pass filter 1 shown in FIGS. 1A and 1B has a unidirectionally inclined plane 2a in which columnar blocks having a rounded cross-sectional shape are inclined parallel to each other, and a reversely inclined plane 2b which is inclined at an angle α in the opposite direction. are arranged alternately with a space between them, and are determined by a curved surface 2c that connects the adjacent inclined planes 2a and 2b and becomes a convex surface and forms a peak, and a curved surface 2a that becomes a concave surface and forms a trough. It is a shape.
In FIG. 1B, 3 is a section corresponding to the inclined planes 2a and 2b;
4 indicates a section corresponding to the convex curved surface 2c, and 5 indicates a section corresponding to the concave curved surface 2d. FIG. 2 shows the state of the optical path at one pit portion of the optical low-pass filter 1 described above.
被写体の一点よりの光はズームレンズ６を通つて平行光
とされて光学的低域フィルタ１内に入る。この平行光の
うち、フィルタ１の一方向傾斜平面２ａに対向する光束
７ａ及び逆方向傾斜平面２ｂに対向する光束７ｂは夫々
傾斜平面２ａ、２ｂで互いに逆方向に屈折し、マスター
レンズ８て更に屈折して、光電交換面９上距離（ボケ幅
）Δ離れた点Ａ、Ｂに結像する。凸状曲面２ｃに対向す
る光束７ｃは、凸状曲面２ｃで集光するように屈折しマ
スターレンズ８を通つて、光電変換面９中点Ａ，Ｂ間全
面に亘つて照射する（左斜下向きハンチングで示す）。
また凹状曲面２ｄに対向する光束７ｄは、この凹状曲面
２ｄで拡散するように屈折し、マスターレンズ８を通し
て、上記の場合と同様に点Ａ，Ｂ間に亘つて光電変換面
９を照射する（右斜下向きのハンチングで示す）。これ
により、光電変換面９上での光量分布は、グラフ線１０
ａ，１０ｂ，１０ｃで示す如くになる。点Ａ，Ｂに分か
れた光によりローパス効果が得られ、点Ｃでの光により
解像度効果が得られ、解像度を低下させずに、色ヒート
発生を効果的に防止出来ることになる。Light from one point on the subject passes through the zoom lens 6 and is converted into parallel light, which enters the optical low-pass filter 1. Among these parallel lights, the light beam 7a facing the one-way inclined plane 2a of the filter 1 and the light beam 7b facing the opposite direction inclined plane 2b are refracted in mutually opposite directions by the inclined planes 2a and 2b, respectively, and are further refracted by the master lens 8. It is refracted and images are formed at points A and B, which are separated by a distance (blur width) Δ on the photoelectric exchange surface 9 . The light beam 7c facing the convex curved surface 2c is refracted so as to be condensed by the convex curved surface 2c, passes through the master lens 8, and irradiates the entire surface between the midpoints A and B of the photoelectric conversion surface 9 (diagonally downward to the left). (indicated by hunting).
Furthermore, the light beam 7d facing the concave curved surface 2d is refracted so as to be diffused by the concave curved surface 2d, passes through the master lens 8, and irradiates the photoelectric conversion surface 9 between points A and B in the same manner as in the above case. (indicated by a downward-slanting hunting pattern). As a result, the light amount distribution on the photoelectric conversion surface 9 is changed to the graph line 10
It becomes as shown by a, 10b, and 10c. The light split into points A and B provides a low-pass effect, and the light at point C provides a resolution effect, making it possible to effectively prevent color heat generation without reducing resolution.
即ち、解像度及び色ヒートについて共に満足出来る撮像
系が構成出来ることになる。本発明は、上記の光学的低
域フィルタ１の製造方法に係るものである。In other words, it is possible to construct an imaging system that can satisfy both resolution and color heat. The present invention relates to a method of manufacturing the optical low-pass filter 1 described above.
第３図はこのフィルタを製造するブレス装置１５を示す
。同図中、１６は透明プラスチックであるアクリル樹脂
板であり、固定スタンパ１７上に載置してある。アクリ
ル樹脂板１６をヒータ１８で加熱した状態で、可動スタ
ンパ１９を下降させて上記樹脂板１６を加圧することに
より、樹脂板１６の下面側がスタンパ１７の型形状に対
応した形状に成型され、第１図Ａに示す光学的低域フィ
ルタ１がブレス成形される。第４図は本出願人が最初に
考えたスタンパを示す。FIG. 3 shows a press apparatus 15 for manufacturing this filter. In the figure, 16 is an acrylic resin plate made of transparent plastic, and is placed on a fixed stamper 17. With the acrylic resin plate 16 heated by the heater 18, the movable stamper 19 is lowered to pressurize the resin plate 16, so that the lower surface side of the resin plate 16 is molded into a shape corresponding to the mold shape of the stamper 17. An optical low-pass filter 1 shown in FIG. 1A is press molded. FIG. 4 shows a stamper originally conceived by the applicant.
このスタンパ２０は型２１をフィルタ１の表面形状に対
応した形状としたものである。このスタンパ２０の型２
１は凹・凸状曲面と傾斜平面とが組合わさつた形状であ
り、更には凹部の深さが実際には１μ以下と極めて浅い
ものであるため、製作が極めて困難てあるという問題点
を有する。そこで、本出願人は、ブレス成形品か成形後
多少復元して形状がスタンパの型とは多少異なるものと
なることに着目して、凹凸曲面については復元により所
定の凹凸曲面となるようにし、スタンパの型の形状を単
純な形状とした。第５図は本発明の要部をなすスタンパ
２２を示す。This stamper 20 has a mold 21 having a shape corresponding to the surface shape of the filter 1. Mold 2 of this stamper 20
1 has a shape that is a combination of a concave/convex curved surface and an inclined plane, and furthermore, the depth of the concave portion is actually extremely shallow, less than 1 μm, so it has the problem that it is extremely difficult to manufacture. . Therefore, the present applicant focused on the fact that the shape of a press-molded product is slightly different from that of the stamper mold because it is slightly restored after molding, and the uneven curved surface is restored to a predetermined uneven curved surface. The shape of the stamper mold was made simple. FIG. 5 shows a stamper 22 which constitutes the essential part of the present invention.
このスタンパ２２の型２３は、交互に逆方向に傾斜した
傾斜平面２４ａ，２４ｂが連続する三角形状としてある
。こ）で、ピッチＰは０．８７１７？！、角度βは３″
としてある。このスタンパ２２の型２３の断面は全て直
線て定まるため、切削加工により比較的簡単に且つ高精
度に製造できる。このスタンパ２２を使用し、ブレス圧
、ブレス時間、ブレス温度等のブレス条件を管理するこ
とにより、所定量復元して最終的には第１図Ａ，Ｂに示
す光学的低域フィルタ１の形状に一致したブレス成形品
２５が得られることになる。本出願人は、ブレス条件と
して、ブレス圧力を７０ｋｇＩｃＩｔ１ブレス温度を１
１６℃、ブレス時間を１囲２に定めてブレス成形を行な
い、所望形状のブレス成形品を得た。なお、ブレス条件
を変えることにより、復元量、即ちブレス成形品の形状
、特に曲面の形状が大きく変化する。The mold 23 of the stamper 22 has a triangular shape in which inclined planes 24a and 24b which are alternately inclined in opposite directions are continuous. ), the pitch P is 0.8717? ! , angle β is 3″
It is as follows. Since the cross section of the mold 23 of this stamper 22 is entirely determined by a straight line, it can be manufactured relatively easily and with high precision by cutting. By using this stamper 22 and controlling the pressing conditions such as pressing pressure, pressing time, and pressing temperature, the shape of the optical low-pass filter 1 is finally restored by a predetermined amount as shown in FIGS. 1A and 1B. A breath molded product 25 that conforms to the above will be obtained. The applicant set the breath pressure to 70 kgIcIt1 and the breath temperature to 1 as the breath conditions.
Press molding was carried out at 16° C. and the pressing time was set at 1×2 to obtain a press molded product having a desired shape. Note that by changing the pressing conditions, the amount of restoration, that is, the shape of the press-molded product, especially the shape of the curved surface, changes greatly.
また上記三条件の内、特にブレス温度が復元量に大きく
影響し、これを可変することにより、所望形状のブレス
成形品を得ることができる。上述の如く、本発明になる
光学的低域フィルタの製造方法によれば、交互に逆方向
に傾斜し連続する傾斜平面により定まる三角断面形状の
成形型を使用し、ブレス条件を制御してブレス成形する
ことにより、復元して山部及び谷部が曲面となる所定形
状の光学的低域フィルタを製造する構成としてあるため
、ブレス型として比較的簡単に且つ高精度に製作される
ブレス型を使用することが出来、従つて、高品質の光学
的低域フィルタを安価に製造し得るという特長を有する
。Further, among the above three conditions, the press temperature in particular greatly influences the amount of restoration, and by varying this, a press molded product with a desired shape can be obtained. As described above, according to the method of manufacturing an optical low-pass filter according to the present invention, a mold having a triangular cross section defined by successive inclined planes that are alternately inclined in opposite directions is used, and the pressing conditions are controlled. By molding, it is possible to manufacture an optical low-pass filter with a predetermined shape in which the peaks and valleys are curved. Therefore, it has the advantage that a high-quality optical low-pass filter can be manufactured at low cost.
第１図Ａ，Ｂは夫々本発明になる製造方法により製造さ
れる光学的低域フィルタの斜視図及びその形状の一部を
拡大して示す図、第２図は第１図Ａの光学的低域フィル
タを組込んだ撮像管光学系を示す図、第３図は本発明に
なる製造方法に適用されるブレス成形装置の一例を示す
図、第４図は本出願人が最初に案出したスタンパの形状
を示す図、第５図は本発明の要部をなすスタンパの一実
施例の形状とこれにより成形されたブレス成形品の形状
とを対応させて示す図である。
１・・・光学的低域フィルタ、２ａ，２ｂ・・・傾斜平
面、２ｃ，２ｄ・・・曲面、６・・・ズームレンズ、８
・・・マスターレンズ、９・・・光電変換面、１５・・
・ブレス装置、１６・・・アクリル樹脂板、１７・・・
固定スタンパ、１８・・・ヒータ、１９・・・可動スタ
ンパ、２２・・・スタンパ、２３・・・型、２４ａ，２
４ｂ・・・傾斜平面、２５・・・ブレス成形品。1A and 1B are perspective views and partially enlarged views of the shape of optical low-pass filters manufactured by the manufacturing method according to the present invention, and FIG. FIG. 3 is a diagram showing an example of a breath molding device applied to the manufacturing method of the present invention, and FIG. 4 is a diagram showing an image pickup tube optical system incorporating a low-pass filter. FIG. 5 is a diagram showing the shape of an embodiment of the stamper, which is a main part of the present invention, and the shape of a press molded product formed using the same. DESCRIPTION OF SYMBOLS 1... Optical low-pass filter, 2a, 2b... Inclined plane, 2c, 2d... Curved surface, 6... Zoom lens, 8
...Master lens, 9...Photoelectric conversion surface, 15...
・Breath device, 16... Acrylic resin plate, 17...
Fixed stamper, 18... Heater, 19... Movable stamper, 22... Stamper, 23... Mold, 24a, 2
4b... Inclined plane, 25... Breath molded product.
Claims (1)
る断面三角形状の成形型を使用し、プレス条件を制御し
てプレス成形して、山部及び谷部が復元により曲面とな
る断面形状の光学的低域フィルタを得ることを特徴とす
る光学的抵域フィルタの製造方法。1. Using a mold with a triangular cross section determined by continuous inclined planes that alternately incline in opposite directions, press molding is performed by controlling the press conditions to create an optical cross-sectional shape in which the peaks and valleys become curved upon restoration. 1. A method for manufacturing an optical pass filter, characterized in that a low pass filter is obtained.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16574080A JPS6055810B2 (en) | 1980-11-25 | 1980-11-25 | Method of manufacturing optical low-pass filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16574080A JPS6055810B2 (en) | 1980-11-25 | 1980-11-25 | Method of manufacturing optical low-pass filter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5789721A JPS5789721A (en) | 1982-06-04 |
| JPS6055810B2 true JPS6055810B2 (en) | 1985-12-06 |
Family
ID=15818168
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16574080A Expired JPS6055810B2 (en) | 1980-11-25 | 1980-11-25 | Method of manufacturing optical low-pass filter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6055810B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0525103U (en) * | 1991-08-27 | 1993-04-02 | 三菱重工業株式会社 | Rear flue bypass controller |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3502573C3 (en) * | 1985-01-26 | 2002-04-25 | Bosch Gmbh Robert | Device for venting fuel tanks |
| KR20000057329A (en) * | 1996-12-03 | 2000-09-15 | 아라끼 타다시, 고다마 순이치론 | Phase Grating And Its Manufacuring Method |
-
1980
- 1980-11-25 JP JP16574080A patent/JPS6055810B2/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0525103U (en) * | 1991-08-27 | 1993-04-02 | 三菱重工業株式会社 | Rear flue bypass controller |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5789721A (en) | 1982-06-04 |
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