JPS58174902A - Molding die of pentagonal roof prism - Google Patents
Molding die of pentagonal roof prismInfo
- Publication number
- JPS58174902A JPS58174902A JP5866882A JP5866882A JPS58174902A JP S58174902 A JPS58174902 A JP S58174902A JP 5866882 A JP5866882 A JP 5866882A JP 5866882 A JP5866882 A JP 5866882A JP S58174902 A JPS58174902 A JP S58174902A
- Authority
- JP
- Japan
- Prior art keywords
- roof prism
- pieces
- pentagonal roof
- angle
- prism
- 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
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
- B29D11/0074—Production of other optical elements not provided for in B29D11/00009- B29D11/0073
Landscapes
- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Ophthalmology & Optometry (AREA)
- Mechanical Engineering (AREA)
- Optical Elements Other Than Lenses (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は、ペンタゴナルダハプリズムの成形金型に関す
るものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mold for forming a pentagonal roof prism.
従来、−1ルフカメラ等に使用されるペンタゴナルダハ
プリズムはガラスによシ製作している。Conventionally, pentagonal roof prisms used in -1 roof cameras and the like have been made of glass.
しかしながら、このガラスからの削り出しケ龜わめて工
数の高いものであシ、また、生産性も低いことからプラ
スチックスによる成形品によシ製作しようとすることが
試みられている。このプラスチックス成形による場合に
は製作の工数が低く、生産性は高く、重量も小さい等の
種々の利点がある反面、成形時にヒケが発生し易く、形
状安定性が低いと云う欠点を有する。とくに、二つの反
射面を直角に配列し、これによ如、儂の左右反転を行な
わせる部分において、二つの反射面のなす稜線部にヒケ
が生じて直角部分が鈍角になると、ファインダーとして
使用したときにゴースト儂が見えると云う欠点がある。However, machining from glass requires a very high number of man-hours, and productivity is also low, so attempts have been made to manufacture molded products from plastic. Although this plastic molding has various advantages such as low manufacturing man-hours, high productivity, and small weight, it has the disadvantages that sink marks are likely to occur during molding and shape stability is low. In particular, when two reflective surfaces are arranged at right angles and the image is reversed left and right, if a sink mark occurs on the ridge line formed by the two reflective surfaces and the right angle becomes an obtuse angle, it is difficult to use it as a finder. The drawback is that when you do this, you can see a ghost.
本発明は、このような点に鑑みなされたもので、プラス
チックス成形によシ正確なダノ・角度を備えたペンタゴ
ナルダハプリズムを得ることができるペンタゴナルダハ
プリズムの成形金型を提供することを目的とする。The present invention has been made in view of the above points, and an object of the present invention is to provide a mold for forming a pentagonal roof prism that can obtain a pentagonal roof prism with accurate dowels and angles by plastic molding. shall be.
本発明は、複数個の臘駒を組み合わせることによシペン
タゴナルダハプリズムに一致した形状の凹部を形成し、
このrMJlfllのダハ角度を形成する稜線部の裏面
に製板との間に僅かな隙間を形成する欠落部を形成した
のて、射出成形時に凹部内の内圧の増加により欠落部の
存する部分において型駒が弾性変形し、これにより、稜
線部の樹脂量を増加させて冷却後には正確なダハ角度を
得ることができるように構成したものである。The present invention forms a concave portion having a shape matching that of a shippentagonal roof prism by combining a plurality of lattice pieces,
After forming a missing part that forms a slight gap between the plate and the plate on the back side of the ridgeline part that forms the roof angle of rMJlfll, during injection molding, the part where the missing part exists due to the increase in internal pressure in the recess. The piece is configured to be elastically deformed, thereby increasing the amount of resin at the ridgeline portion, so that an accurate roof angle can be obtained after cooling.
本発明の一実施例を図面に基づいて説明する。An embodiment of the present invention will be described based on the drawings.
まず、第1図および第2図に基づきペンタゴナルダハプ
リズム(1)の形状について説明する。下方には儂が直
角に入射される透光面(2)が設けられ、この透光面(
2)の上方にはたがいに直角をなす二つの反射面(3)
(4)が傾斜し良状態で設けられ、これらの反射面(
3) (4)で反射した儂をさらに反射する反射面(5
)が設けられ、この反射面(5)から反射された像は透
光面(6)よシ外部に出る。そして、前記ペンタゴナル
ダハプリズム(1)は八面体よシなるものであり、他の
三面は光学的不使用面である。First, the shape of the pentagonal roof prism (1) will be explained based on FIGS. 1 and 2. At the bottom, there is a transparent surface (2) through which I enter at right angles, and this transparent surface (2)
2) Two reflective surfaces at right angles to each other above (3)
(4) are inclined and in good condition, and these reflective surfaces (
3) A reflective surface (5) that further reflects the me reflected in (4).
) is provided, and the image reflected from this reflective surface (5) exits through the transparent surface (6). The pentagonal roof prism (1) is an octahedron, and the other three surfaces are optically unused surfaces.
しかして、反射面(3)(4)により稜線@ (7)が
形成されるが、この反射面(3)(4)部分を成形する
金蓋について以下説明する。まず、この種の光学部品は
その精度がきわめて高いものを要求されるため、キャビ
ティ(8)の形成に轟っでは型駒(9)(2)を渥板Q
論で組合せる。Thus, a ridge line @ (7) is formed by the reflective surfaces (3) and (4), and the metal lid forming the reflective surfaces (3) and (4) will be described below. First of all, this type of optical component requires extremely high precision, so when forming the cavity (8), the mold pieces (9) and (2) were moved to the cutting board Q.
Combine in theory.
このような型駒(9)(ト)はその稜線部(7)を形成
すべき部分がつきあて部になっておシ、この部分のキャ
ピテイ(8)の裏面には欠落部(2)が形成されている
。In such a mold piece (9) (g), the part where the ridgeline part (7) should be formed is the abutting part, and the back side of the capity (8) in this part has a missing part (2). It is formed.
この欠落部働の深さは0.3〜2μであシ1幅は片側で
0.1〜Ojmである。そして、キャビティ(8)マで
の寸法はtに設定される。The depth of this cutout is 0.3 to 2 μm, and the width of each side is 0.1 to 0.0 m. The dimension of the cavity (8) is then set to t.
このような構成において、射出成形時にはキャビティ(
8)内は高圧になシ、これによりm駒(9)(ト)には
強い内圧が作用する。これらの型駒(9)(至)の大部
分は載板α劾の平坦面に接合しているため、渥板αηに
より充分に受けられるが、稜線部(7)においては欠落
部(2)が存するために弾性変形し、充填された樹脂は
稜線部(7)において鋭角となる。この状態で冷却され
ると、稜線部(7)でのヒケが大きく、冷却後において
は稜線its (7)が正確な直角となり、だれも生じ
ない。In such a configuration, the cavity (
There is no high pressure inside 8), so strong internal pressure acts on the m pieces (9) and (g). Since most of these mold pieces (9) (to) are connected to the flat surface of the mounting board α, they can be fully received by the cutting board αη, but at the ridge line part (7), the missing part (2) The resin is elastically deformed due to the existence of the curve, and the filled resin forms an acute angle at the ridge line (7). If it is cooled in this state, the ridge line (7) will have a large sink mark, and after cooling, the ridge line its (7) will be at an exact right angle, and no one will appear.
しかして、実施に当っては、型駒(9)(ト)の稜線部
(7)の材料厚tの寸法は材料の曲げ弾性係数、射出圧
等との関連において定めなければならないものであり、
実験的に定められる性質のものである。Therefore, in practice, the material thickness t of the ridgeline portion (7) of the mold piece (9) (g) must be determined in relation to the material's bending elastic modulus, injection pressure, etc. ,
It is of an experimentally determined nature.
この際に、材料厚tを加工してもキャビティ(8)の鏡
面を加工することはないので、鏡面加工を行なった型駒
(9)αQを不良品にする確率はきわめて低い。At this time, even if the material thickness t is processed, the mirror surface of the cavity (8) is not processed, so the probability that the mirror-finished mold piece (9) αQ will be defective is extremely low.
本発明は、上述のように成形されるべきペンタゴナルダ
ハプリズムの形状に一致し九凹部を複数個の型駒により
形成し、稜線部の裏面に僅かな隙間を形成するための欠
落部を形成したので、射出成形時に欠落部の部分におけ
る型駒が変形し、これにより、稜線部への樹脂充填量が
増加して冷却時のヒケが生じても稜線部の直角度はかな
り正確なものを得ることができるものである。According to the present invention, nine concave portions are formed by a plurality of mold pieces in accordance with the shape of the pentagonal roof prism to be molded as described above, and a cutout portion is formed on the back surface of the ridge line portion to form a slight gap. Therefore, even if the mold pieces at the missing parts are deformed during injection molding, which increases the amount of resin filled into the ridges and causes sink marks during cooling, the squareness of the ridges can be quite accurate. It is something that can be done.
図面は本発明の一実施例を示すもので、第1図はペンタ
ゴナルダハプリズムの側面図、第2図はその正面図、第
3図は金蓋の一部の断面図、第4図は型駒の正面図、篤
5図はその一部の拡大正面図、第6図は成形時の変形状
態を示す拡大正面図、第7図は成形時の充填状態を一点
鎖線で示し冷却後の□状態を実線で示した成形品の一部
の正面図である。
1・・・ペンタゴナルダハプリズム、7・・・稜線部、
8・・・キャビティ、9〜1o・・・型駒、11・・・
型板、12・・・欠落部
出 願 人 株式会社リコー
−篇」 関 曇も7口
1口病
−寛げ図
にへ6 図
ノもqnThe drawings show one embodiment of the present invention, in which Fig. 1 is a side view of a pentagonal roof prism, Fig. 2 is a front view thereof, Fig. 3 is a cross-sectional view of a part of the metal lid, and Fig. 4 is a mold. A front view of the piece, Figure 5 is an enlarged front view of a part of it, Figure 6 is an enlarged front view showing the deformed state during molding, and Figure 7 shows the filled state during molding with a dashed line, and the □ state after cooling. FIG. 3 is a front view of a part of the molded product shown in solid lines. 1... Pentagonal roof prism, 7... Ridgeline part,
8... Cavity, 9-1o... Mold piece, 11...
Template, 12...Missing part applicant: Ricoh Co., Ltd. - edition" Seki Kumo mo 7 Kuchi 1 Kuchi disease - Relaxation map 6 Figure no mo qn
Claims (1)
凹部を複数の型駒を組合わせることによシ形成し、前記
ペンタゴナルダハプリズムのダノ・角度を形成する稜線
部の裏面に濾板との間に僅かな隙間を形成するための欠
落部を形成したことを特徴とするペンタゴナルダハプリ
ズムの成形金蓋。A concave portion matching the shape of the pentagonal roof prism to be molded is formed by combining a plurality of mold pieces, and a slight gap between the filter plate and the back surface of the ridgeline portion forming the dowel/angle of the pentagonal roof prism is formed. A molded metal lid of a pentagonal roof prism, which is characterized by having a missing part to form a gap.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5866882A JPS58174902A (en) | 1982-04-08 | 1982-04-08 | Molding die of pentagonal roof prism |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5866882A JPS58174902A (en) | 1982-04-08 | 1982-04-08 | Molding die of pentagonal roof prism |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS58174902A true JPS58174902A (en) | 1983-10-14 |
Family
ID=13090960
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP5866882A Pending JPS58174902A (en) | 1982-04-08 | 1982-04-08 | Molding die of pentagonal roof prism |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS58174902A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5946147A (en) * | 1993-06-04 | 1999-08-31 | Minolta Co., Ltd. | Roof prism |
-
1982
- 1982-04-08 JP JP5866882A patent/JPS58174902A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5946147A (en) * | 1993-06-04 | 1999-08-31 | Minolta Co., Ltd. | Roof prism |
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