JPH05182407A - Metal mold for molding tape cassette - Google Patents
Metal mold for molding tape cassetteInfo
- Publication number
- JPH05182407A JPH05182407A JP35821591A JP35821591A JPH05182407A JP H05182407 A JPH05182407 A JP H05182407A JP 35821591 A JP35821591 A JP 35821591A JP 35821591 A JP35821591 A JP 35821591A JP H05182407 A JPH05182407 A JP H05182407A
- Authority
- JP
- Japan
- Prior art keywords
- prism
- plate
- slide core
- forming
- forming 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.)
- Pending
Links
- 238000000465 moulding Methods 0.000 title claims abstract description 13
- 239000002184 metal Substances 0.000 title description 5
- 230000005540 biological transmission Effects 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 3
- 238000003754 machining Methods 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 230000003287 optical effect Effects 0.000 abstract description 2
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000001746 injection moulding Methods 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
Landscapes
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、テープカセット成形用
金型、詳しくはテープ終端検出用のプリズムをケース本
体と一体成形しうるようにした金型の構造に関するもの
である。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape cassette molding die, and more particularly to a structure of a die in which a tape end detection prism can be integrally formed with a case body.
【０００２】[0002]
【従来の技術】従来、デジタルオーディオテープカセッ
トでは、プリズムを用いた光学式のテープ終端検出機構
が多く使用されている。図４に示すようにプリズム１０
は、四角形状の水平部と垂直部とからなる光透過部１１
の該垂直部の上端部、下端部に対向して傾斜角が４５°
の第２反射面１３，第１反射面１２がそれぞれ形成さ
れ、これらの反射面間には小平面の前面１４が形成され
ている。このプリズム１０は透明樹脂からなり、不透明
樹脂よりなるケース本体３１と２色射出成形で一体成形
され、前記水平部を介してケース本体３１上面に融着さ
れている。また、このケース本体３１にはプリズム１０
に対向して窓部３２が形成され、これらプリズム１０と
窓部３２の組み合わせがケース本体３１の両端部に対向
配備されている。2. Description of the Related Art Conventionally, in a digital audio tape cassette, an optical tape end detecting mechanism using a prism is often used. As shown in FIG.
Is a light transmitting portion 11 including a rectangular horizontal portion and a vertical portion.
The inclination angle is 45 ° facing the upper and lower ends of the vertical portion of
The second reflecting surface 13 and the first reflecting surface 12 are formed respectively, and a small front surface 14 is formed between these reflecting surfaces. The prism 10 is made of a transparent resin, is integrally molded with a case body 31 made of an opaque resin by two-color injection molding, and is fused to the upper surface of the case body 31 via the horizontal portion. Further, the prism body 10 is provided in the case main body 31.
The window portion 32 is formed so as to face each other, and the combination of the prism 10 and the window portion 32 is provided so as to face both ends of the case body 31.
【０００３】そして、前記プリズム１０とケース本体３
１の一体成形ではプリズム１０にアンダーカットがある
ため、図５に示すようにプリズム１０の第１反射面１２
形成面４５，第２反射面１３形成面４３，前面１４形成
面４４及び光透過部１１の一方側の側面形成面４６を備
えた前記垂直部形成用のスライドコア４１を図６に示す
射出成形金型５１内に矢印方向にスライド可能に設けて
プリズム１０を成形することが行われてきた。The prism 10 and the case body 3
In the integral molding of No. 1, the prism 10 has an undercut. Therefore, as shown in FIG.
The slide core 41 for forming the vertical portion, which includes the forming surface 45, the second reflecting surface 13 forming surface 43, the front surface 14 forming surface 44, and the side surface forming surface 46 on one side of the light transmitting portion 11, is injection molded as shown in FIG. The prism 10 has been formed by being provided in the mold 51 so as to be slidable in the arrow direction.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、上記ス
ライドコア４１では、第１反射面形成面４５，前面１４
形成面４４及び第２反射面形成面４３が連続し、これら
と直交する側面形成面４６を備えた凹部４２として板状
体４１に形成されていた。このような凹部４２を板状体
４１に形成する場合、機械加工が困難であり、さらに各
面交叉部の仕上げ加工を手作業による磨き加工で行って
いたので、製作に熟練を要したり長時間掛かるうえ、金
型製作精度にバラツキが生じ易く仕上げの平面度が十分
でないため成形されたプリズムの機能が不正確になり易
いという問題点があった。However, in the above slide core 41, the first reflecting surface forming surface 45 and the front surface 14 are provided.
The formation surface 44 and the second reflection surface formation surface 43 are continuous, and are formed in the plate-like body 41 as the recessed portion 42 having the side surface formation surface 46 orthogonal to these. When such a recess 42 is formed in the plate-like body 41, it is difficult to machine, and further, since finishing of each crossing portion is carried out by manual polishing, it takes a lot of skill and long time to manufacture. In addition, it takes time, and the precision of the mold is likely to vary, and the flatness of the finish is not sufficient, so that the function of the molded prism tends to be inaccurate.
【０００５】本発明では、二つの板状体を用い、プリズ
ムの第１反射面，前面及び第２反射面形成用の連続平面
を一つの板状体に形成し、他の板状体は単に平板状のも
のを用い、これらを重合してスライドコアを構成するこ
とにより、上記従来の問題点を解決したものである。In the present invention, two plate-like bodies are used, and the continuous planes for forming the first reflecting surface, the front surface and the second reflecting surface of the prism are formed in one plate-like body, and the other plate-like bodies are simply formed. The above-mentioned conventional problems are solved by using flat plates and polymerizing them to form a slide core.
【０００６】[0006]
【課題を解決するための手段】本発明は、テープカセッ
トのケース本体を成形する金型内にテープ終端検出用プ
リズムを成形するスライドコアを設け、前記ケース本体
とプリズムを一体成形するようにしたテープカセット成
形用金型において、前記スライドコアを、プリズムの対
向反射面形成面及び、該対向反射面間の光透過部のうち
スライドコアのスライド方向と直交する面形成面を備え
た第１板状部材と、前記プリズムの光透過部のうちスラ
イドコアのスライド方向と平行な二つの側面の少なくと
も一方を形成する第２板状部材とから構成したことを特
徴とするテープカセット成形用金型である。According to the present invention, a slide core for molding a tape end detection prism is provided in a mold for molding a case body of a tape cassette, and the case body and the prism are integrally molded. In the tape cassette molding die, the slide core is provided with a first reflection plate-forming surface of the prism and a surface forming surface of the light transmitting portion between the reflection surfaces which is orthogonal to the sliding direction of the slide core. And a second plate-shaped member forming at least one of two side surfaces of the light transmitting portion of the prism which are parallel to the sliding direction of the slide core. is there.
【０００７】[0007]
【作用】第１反射面形成面、前面形成面及び第２反射面
形成面を備えた第１板状部材の一枚と、単に平板状の第
２板状部材の一枚とを重合すれば、図５と同様形状のス
ライドコアが構成される。また、第１板状部材の上下面
に第２板状部材を一枚ずつ重合すれば、プリズムの光透
過部の両側面を形成しうるスライドコアとなる。If the first plate-shaped member having the first reflection surface forming surface, the front surface forming surface and the second reflection surface forming surface and the single flat plate-shaped second plate-shaped member are superposed, A slide core having the same shape as that of FIG. 5 is configured. Also, by stacking the second plate-shaped members one by one on the upper and lower surfaces of the first plate-shaped member, a slide core capable of forming both side surfaces of the light transmitting portion of the prism is formed.
【０００８】[0008]
【実施例】本発明の実施例を、スライドコアの製作手順
に関し図面に基づいて説明すると、図３に示す形状の金
属板を２枚用意し、その一方には図２に示すように、該
金属板端部の傾斜側面３1 部分を切削して第１反射面形
成面４５，前面形成面４４及び第２反射面形成面４３を
形成したのち、これらの形成面を機械加工により研磨し
て第１板状部材２とし、他方の金属板はそのまま第２板
状部材３とする。そして、これら第１，第２板状部材
２，３をその各側面を一致させて重合・固着し、図１に
示すとおりのスライドコア１とする。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings regarding a procedure for manufacturing a slide core. Two metal plates having the shape shown in FIG. 3 are prepared, and one of them is provided with a metal plate as shown in FIG. the first reflecting surface forming surface 45 by cutting the inclined side surface 3 a portion of the metal plate ends, after forming the front forming surface 44 and the second reflecting surface-forming surface 43, these forming surface is polished by machining The first plate member 2 is used, and the other metal plate is used as it is as the second plate member 3. Then, these first and second plate-shaped members 2 and 3 are superposed and fixed so that their respective side surfaces are aligned with each other, to obtain a slide core 1 as shown in FIG.
【０００９】別の実施例として、図２の第１板状部材２
の上，下両面に図３の第２板状部材３を一枚ずつ重合す
れば、プリズム１０の光透過部両側面を形成しうるスラ
イドコアが構成される。As another embodiment, the first plate member 2 shown in FIG.
By stacking the second plate-shaped members 3 of FIG. 3 on the upper and lower surfaces, one by one, a slide core capable of forming both side surfaces of the light transmitting portion of the prism 10 is constructed.
【００１０】[0010]
【発明の効果】本発明では、カセットにテープ終端検出
用プリズムを成形するためのスライドコアを、プリズム
の対向反射面形成面及び、該対向反射面間の光透過部の
うちスライドコアのスライド方向と直交する面形成面を
備えた第１板状部材と、前記プリズムの光透過部のうち
スライドコアのスライド方向と平行な二つの側面の少な
くとも一方を形成する第２板状部材とから構成したこと
により、前記第１板状部材における各プリズム形成面は
板体の上面から下面に至るものであるから、該プリズム
形成面は、機械加工で簡便に研磨仕上げすることができ
て平面度に優れたものとなり、また、前記第２板状部材
では第１板状部材との重合面を機械加工で簡単に研磨仕
上げできて、該重合面の一部がプリズムの側面形成面と
なるから、該側面形成面の平面度も優れたものとなり、
したがって、手作業による仕上げ加工を要することなく
簡便に、プリズム形成面の平面度が高いスライドコアを
製作することができるし、各形成面の交叉部の形状も正
確なものとなり、スライドコアの製作工程が大幅に改善
されるうえ、プリズムの各面の平面度及び平行対向面の
平行度が高まり光透過性及び反射精度に優れたプリズム
を安価に提供することができるものである。According to the present invention, the slide core for molding the prism for detecting the tape end is formed in the cassette, and the slide core of the prism is formed in the opposite reflection surface forming surface and the light transmitting portion between the opposite reflection surfaces. And a second plate-shaped member forming at least one of two side surfaces parallel to the sliding direction of the slide core in the light transmitting portion of the prism. As a result, since each prism forming surface of the first plate member extends from the upper surface to the lower surface of the plate body, the prism forming surface can be easily polished by machining and has excellent flatness. Further, in the second plate-shaped member, the overlapping surface with the first plate-shaped member can be easily polished by machining, and a part of the overlapping surface becomes the side surface forming surface of the prism. side Flatness of the Narumen also becomes excellent,
Therefore, it is possible to easily manufacture a slide core with a high degree of flatness on the prism forming surface without the need for finishing work by hand, and the shape of the intersecting portion of each forming surface is also accurate. In addition to greatly improving the steps, the flatness of each surface of the prism and the parallelism of the parallel facing surfaces are increased, and a prism excellent in light transmission and reflection accuracy can be provided at low cost.
【図１】本発明の実施例の斜視図である。FIG. 1 is a perspective view of an embodiment of the present invention.
【図２】第１板状部材の斜視図である。FIG. 2 is a perspective view of a first plate-shaped member.
【図３】第２板状部材の斜視図である。FIG. 3 is a perspective view of a second plate-shaped member.
【図４】テープカセットのプリズム配設部の斜視図であ
る。FIG. 4 is a perspective view of a prism arrangement portion of the tape cassette.
【図５】従来のスライドコアの斜視図である。FIG. 5 is a perspective view of a conventional slide core.
【図６】プリズム成形時のスライドコアの作動関連図で
ある。FIG. 6 is a diagram relating to the operation of the slide core during prism molding.
１ スライドコア ２ 第１板状部材 ３ 第２板状部材 ３1 傾斜側面 10 プリズム 11 光透過部 12 第１反射面 13 第２反射面 14 前面 31 ケース本体 32 窓部 41 スライドコア 42 凹部 43 第２反射面形成面 44 前面形成面 45 第１反射面形成面 46 側面形成面 51 射出成形金型1 Slide Core 2 1st Plate Member 3 2nd Plate Member 3 1 Inclined Side Surface 10 Prism 11 Light Transmission Part 12 First Reflection Surface 13 Second Reflection Surface 14 Front Surface 31 Case Body 32 Window 41 Slide Core 42 Recess 43 2 Reflection surface forming surface 44 Front surface forming surface 45 First reflection surface forming surface 46 Side surface forming surface 51 Injection molding die
Claims (1)
金型内にテープ終端検出用プリズムを成形するスライド
コアを設け、前記ケース本体とプリズムを一体成形する
ようにしたテープカセット成形用金型において、前記ス
ライドコアを、プリズムの対向反射面形成面及び、該対
向反射面間の光透過部のうちスライドコアのスライド方
向と直交する面形成面を備えた第１板状部材と、前記プ
リズムの光透過部のうちスライドコアのスライド方向と
平行な二つの側面の少なくとも一方を形成する第２板状
部材とから構成したことを特徴とするテープカセット成
形用金型。1. A tape cassette molding die in which a slide core for molding a tape end detection prism is provided in a die for molding a case body of a tape cassette, and the case body and the prism are integrally molded. A first plate-shaped member having a surface forming surface of the slide core, the surface forming a counter reflection surface of a prism, and a surface of the light transmitting portion between the reflection surfaces that is orthogonal to the slide direction of the slide core; A tape cassette molding die, comprising: a second plate-shaped member that forms at least one of two side surfaces of the transmission part that are parallel to the sliding direction of the slide core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35821591A JPH05182407A (en) | 1991-12-27 | 1991-12-27 | Metal mold for molding tape cassette |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35821591A JPH05182407A (en) | 1991-12-27 | 1991-12-27 | Metal mold for molding tape cassette |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05182407A true JPH05182407A (en) | 1993-07-23 |
Family
ID=18458132
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP35821591A Pending JPH05182407A (en) | 1991-12-27 | 1991-12-27 | Metal mold for molding tape cassette |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05182407A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005096296A (en) * | 2003-09-25 | 2005-04-14 | Fujitsu Component Ltd | Waveguide mold |
| JP2009184108A (en) * | 2009-04-22 | 2009-08-20 | Fujitsu Component Ltd | Waveform forming mold polishing jig |
-
1991
- 1991-12-27 JP JP35821591A patent/JPH05182407A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005096296A (en) * | 2003-09-25 | 2005-04-14 | Fujitsu Component Ltd | Waveguide mold |
| JP2009184108A (en) * | 2009-04-22 | 2009-08-20 | Fujitsu Component Ltd | Waveform forming mold polishing jig |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A02 | Decision of refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A02 Effective date: 20011120 |