JPH06231562A - Disk cartridge - Google Patents

Disk cartridge

Info

Publication number
JPH06231562A
JPH06231562A JP4229593A JP4229593A JPH06231562A JP H06231562 A JPH06231562 A JP H06231562A JP 4229593 A JP4229593 A JP 4229593A JP 4229593 A JP4229593 A JP 4229593A JP H06231562 A JPH06231562 A JP H06231562A
Authority
JP
Japan
Prior art keywords
lifter
disk
case
disk cartridge
pressing
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.)
Withdrawn
Application number
JP4229593A
Other languages
Japanese (ja)
Inventor
Yukio Miyazaki
幸夫 宮崎
Masaru Ikebe
優 池辺
Haruo Shiba
晴男 芝
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TDK Corp
Original Assignee
TDK Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by TDK Corp filed Critical TDK Corp
Priority to JP4229593A priority Critical patent/JPH06231562A/en
Priority to US08/182,854 priority patent/US5498456A/en
Publication of JPH06231562A publication Critical patent/JPH06231562A/en
Withdrawn legal-status Critical Current

Links

Abstract

PURPOSE:To obtain a disk cartridge which can be molded with high molding efficiency without necessity of high dimensional accuracy in the case of molding. CONSTITUTION:A lifter 21 for pressing a disk 12 to an inner surface of a case 11 of synthetic resin for rotatably containing the disk 12 is integrally formed with the case 11. Simultaneously, a narrow part 21a is molded at the lifter 21, a wide pressed part 21b is molded at a free end side of the lifter 21 thereby to eliminate large influence of a variation in a thickness size of the lifter 21 to a pressing force to the disk 12.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】この発明は、磁気ディスク等のデ
ィスク状記録媒体をリフタにより押圧してケース内に回
転可能に保持するディスクカートリッジに関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk cartridge for holding a disk-shaped recording medium such as a magnetic disk by a lifter and rotatably holding the disk-shaped recording medium in a case.

【0002】[0002]

【従来の技術】ディスクカートリッジにあっては、周知
のように、ケース内面に設けられたリフタによりシート
状のライナをディスクの面に押圧させている。このよう
なディスクカートリッジには、従来、ケース内面との固
着部を折り曲げた金属片やPET等の合成樹脂板のリフ
タが用いられていた。
2. Description of the Related Art In a disk cartridge, as is well known, a sheet-like liner is pressed against the disk surface by a lifter provided on the inner surface of the case. For such a disc cartridge, conventionally, a lifter made of a synthetic resin plate such as a metal piece or PET in which a fixing portion to the inner surface of the case is bent is used.

【0003】[0003]

【発明が解決しようとする課題】しかしながら、上述し
たディスクカートリッジにあっては、リフタがケースと
別体であるため、金属片からリフタリフタを構成した場
合はカシメ等でケース内面に固定しなければならず、ま
た、合成樹脂からリフタを構成した場合も両面テープ等
でケース内面に固着しなければならず、部品点数の増
大、組立性の低下を招くという問題があった。
However, in the above-mentioned disc cartridge, since the lifter is separate from the case, when the lifter lifter is made of a metal piece, it must be fixed to the inner surface of the case by caulking or the like. In addition, even when the lifter is made of synthetic resin, it has to be fixed to the inner surface of the case with a double-sided tape or the like, which causes an increase in the number of parts and a decrease in assemblability.

【0004】そこで、本出願人にあっては、部品点数の
削減が可能で、かつ、組立性も良好なディスクカートリ
ッジを特願平3−358214号等で提案している。こ
の先願にかかるディスクカートリッジは、リフタをケー
スと一体に成形し、かつ、リフタの根元部を押圧部より
も薄肉に成形するものである。そして、このような先願
のディスクカートリッジでは、ディスクに対するリフタ
の押圧力をリフタの厚さ等を変えて調節していた。
Therefore, the applicant of the present invention has proposed a disk cartridge in which the number of parts can be reduced and which is easy to assemble in Japanese Patent Application No. 3-358214. In the disk cartridge according to this prior application, the lifter is formed integrally with the case, and the base portion of the lifter is formed thinner than the pressing portion. In such a disk cartridge of the prior application, the pressing force of the lifter against the disk is adjusted by changing the lifter thickness and the like.

【0005】ところが、上述した先願のディスクカート
リッジにおいては、リフタの押圧力は厚さ寸法の3乗に
比例し、リフタの厚さの微小の相違が押圧力に大きな影
響を及ぼす。このため、リフタの成形、すなわちケース
の成形には高い寸法精度が求められ、満足すべき成形効
率を得ることが困難であった。この発明は、上記従来の
問題、また、先願の不具合に鑑みてなされたもので、高
い生産効率で成形することができるディスクカートリッ
ジを提供することを目的とする。
However, in the above-mentioned disk cartridge of the prior application, the pressing force of the lifter is proportional to the cube of the thickness dimension, and a slight difference in the lifter thickness has a great influence on the pressing force. Therefore, high dimensional accuracy is required for forming the lifter, that is, for forming the case, and it is difficult to obtain satisfactory forming efficiency. The present invention has been made in view of the above-mentioned conventional problems and the problems of the prior application, and an object thereof is to provide a disk cartridge that can be molded with high production efficiency.

【0006】[0006]

【課題を解決するための手段】上記目的を達成するた
め、この発明は、ディスク状記録媒体を回転可能に収納
する合成樹脂性のケース内面に前記ディスク状記録媒体
を押圧するリフタを立設したディスクカートリッジにお
いて、前記リフタを前記ケースと一体に成形するととも
に、前記リフタを根元部が押圧部よりも狭幅になるよう
に成形した。
In order to achieve the above object, according to the present invention, a lifter for pressing the disk-shaped recording medium is erected on the inner surface of a synthetic resin case for rotatably accommodating the disk-shaped recording medium. In the disk cartridge, the lifter was formed integrally with the case, and the lifter was formed so that the root portion was narrower than the pressing portion.

【0007】そして、この発明のディスクカートリッジ
は、前記リフタの根元部に開口窓部を形成する態様に構
成することができる。
The disk cartridge of the present invention can be constructed in such a manner that an opening window is formed at the base of the lifter.

【0008】[0008]

【作用】この発明にかかるディスクカートリッジによれ
ば、リフタは根元部が押圧部よりも狭幅になるように成
形されるため、リフタの厚さ寸法が押圧力に及ぼす影響
を小さくでき、リフタの厚さ寸法に高い精度を必要とせ
ず、高い生産効率を達成できる。すなわち、リフタによ
る押圧力は厚さ寸法の3乗に比例するが、また、幅寸法
に比例するため、リフタの幅寸法を小さくすることで厚
さ寸法が押圧力に及ぼす影響が小さくなり、高い寸法精
度によることなく成形しても適正な押圧力が得られ、生
産効率を向上できる。
According to the disk cartridge of the present invention, since the lifter is formed so that the root portion is narrower than the pressing portion, the influence of the lifter thickness on the pressing force can be reduced and the lifter It is possible to achieve high production efficiency without requiring high precision in the thickness dimension. That is, the pressing force by the lifter is proportional to the cube of the thickness dimension, but it is also proportional to the width dimension. Therefore, by reducing the width dimension of the lifter, the influence of the thickness dimension on the pressing force is reduced, which is high. Proper pressing force can be obtained even if molding is performed without depending on dimensional accuracy, and production efficiency can be improved.

【0009】そして、この発明のディスクカートリッジ
は、リフタの根元部に開口窓部を形成するように構成す
ることで、根元部の実質的な幅寸法を小さくすることが
できる。
In the disk cartridge of the present invention, the opening portion is formed at the base of the lifter, so that the substantial width of the base can be reduced.

【0010】[0010]

【実施例】以下、この発明の実施例を図面を参照して説
明する。図1から図6はこの発明の一実施例にかかるデ
ィスクカートリッジを示し、図1が下ケースの平面図、
図2が図1のII−II線矢視拡大断面図、図3図1の
III−III線矢視拡大断面図、図4がリフタ廻り部
分の拡大斜視図、図6が成形途中状態の一部拡大断面図
である。
Embodiments of the present invention will be described below with reference to the drawings. 1 to 6 show a disk cartridge according to an embodiment of the present invention, in which FIG. 1 is a plan view of a lower case,
2 is an enlarged sectional view taken along the line II-II in FIG. 1, FIG. 3 is an enlarged sectional view taken along the line III-III in FIG. 1, FIG. 4 is an enlarged perspective view around the lifter, and FIG. FIG.

【0011】図1において、11は下ケースであり、下
ケース11は図示しない上ケースと接合されてケース1
0を構成する。ケース10内には記録媒体であるディス
ク12が回転自在に収容されている。なお、11aは下
ケース11に形成された記録・再生用ヘッド挿入口、1
1bは駆動軸挿通孔であり、図中明示しないが、記録・
再生用ヘッド挿入口11aはシャッタにより開閉され、
駆動軸挿通孔11bには駆動軸が挿通される。
In FIG. 1, reference numeral 11 denotes a lower case, and the lower case 11 is joined to an upper case (not shown) to form a case 1.
Configure 0. A disk 12, which is a recording medium, is rotatably housed in the case 10. Reference numeral 11a denotes a recording / playback head insertion opening formed in the lower case 11.
1b is a drive shaft insertion hole, which is not shown in the drawing
The reproducing head insertion opening 11a is opened and closed by a shutter,
The drive shaft is inserted through the drive shaft insertion hole 11b.

【0012】下ケース11には、内面に凹部25と角度
設定台26とが近接して形成され、凹部25の角度設定
台26と反対側の側面にリフタ21が一体に形成されて
いる。角度設定台26は所定の高さを有してリフタ21
の後述する傾斜角度を規定し、凹部25はリフタ21の
曲げ変形を容易にするために設けられる。なお、上ケー
スに付いては従来の構成でよいので、その詳細な説明は
割愛する。
A recess 25 and an angle setting base 26 are formed close to each other on the inner surface of the lower case 11, and a lifter 21 is integrally formed on the side surface of the recess 25 opposite to the angle setting base 26. The angle setting table 26 has a predetermined height and is provided with a lifter 21.
The recessed angle 25 is provided to facilitate the bending and deformation of the lifter 21. Since the upper case may have a conventional configuration, a detailed description thereof will be omitted.

【0013】リフタ21は、図2、図3および図4に示
すように、下ケース11の内面と連続する根元側に幅寸
法が小さな狭幅部21aが、また、自由端側に幅寸法が
大きな押圧部21bが形成されたT型平板形状を有す
る。図2に示すように、薄肉部21aは曲がりやすくす
るため根元に薄肉化された薄肉部21cが形成され、こ
の薄肉部21cの上縁部がテーパ形状に成形されてい
る。また、図3に示すように、押圧部21bは、先端側
縁部にR面取りが施され、また、根元側の縁部が金型か
らの離型性を良くするためテーパ状に成形されている。
このリフタ21は、角度設定台26側に所定の傾斜角度
に屈曲されて狭幅部21aが角度設定台26に当接し、
押圧部21bがシート状のライナ(図示せず)をディス
ク12の面に押圧している。
As shown in FIG. 2, FIG. 3 and FIG. 4, the lifter 21 has a narrow width portion 21a having a small width dimension on the base side which is continuous with the inner surface of the lower case 11 and a width dimension on the free end side. It has a T-shaped flat plate shape in which a large pressing portion 21b is formed. As shown in FIG. 2, the thin-walled portion 21a has a thin-walled portion 21c formed at the base for facilitating bending, and an upper edge portion of the thin-walled portion 21c is formed in a tapered shape. In addition, as shown in FIG. 3, the pressing portion 21b has a chamfered edge portion on the tip side, and the edge portion on the root side is formed in a tapered shape in order to improve the releasability from the mold. There is.
The lifter 21 is bent toward the angle setting table 26 at a predetermined inclination angle so that the narrow width portion 21 a abuts the angle setting table 26.
The pressing portion 21b presses a sheet-shaped liner (not shown) against the surface of the disk 12.

【0014】この実施例にあっては、ライナをディスク
12に弾性的に押圧するリフタ21に幅寸法と厚さ寸法
とが小さい狭幅部21aが形成され、リフタ21の全体
としての押圧力が狭幅部21aの曲げ剛性に支配的な影
響を受け、狭幅部21aの曲げ剛性を変えることで押圧
力を調整できる。
In this embodiment, a narrow width portion 21a having a small width and a small thickness is formed in the lifter 21 which elastically presses the liner against the disk 12, so that the lifter 21 as a whole exerts a pressing force. The pressing force can be adjusted by changing the bending rigidity of the narrow width portion 21a, which is mainly influenced by the bending rigidity of the narrow width portion 21a.

【0015】ここで、狭幅部21aの曲げ剛性は厚さ寸
法の3乗と幅寸法とに比例するが、狭幅部21aの幅寸
法が小さいため、厚さ寸法が多少変動しても曲げ剛性が
受ける影響は小さい。したがって、このリフタ21の成
形、すなわち下ケース11の成形に高い精度を必要とせ
ず、生産効率を改善することができる。
Here, the bending rigidity of the narrow width portion 21a is proportional to the cube of the thickness dimension and the width dimension, but since the width dimension of the narrow width portion 21a is small, even if the thickness dimension fluctuates a little. The effect of rigidity is small. Therefore, high precision is not required for forming the lifter 21, that is, for forming the lower case 11, and the production efficiency can be improved.

【0016】すなわち、この実施例の下ケース11は、
前述した特願平3−358214号等に記載されるよう
に、製品を金型から突出するための突出ピンによりキャ
ビティを画成して図5に示すような立直状態のリフタ2
1を一体成形し、この立直状態のリフタ21を折り曲げ
て形成される。そして、成形時には、図5に明らかなよ
うに、リフタ21の薄肉部21cがアンダーカットとな
るため、突出ピンを水平移動(図中左右方向)に移動さ
せて離型しなければならず、厳密な寸法管理が困難で厚
さがばらつきを生じやすい。しかしながら、この実施例
によれば、上述したように、多少の厚さの相違は押圧力
に影響を及ぼさないため、不良の発生が防止でき、高い
生産効率を得られる。
That is, the lower case 11 of this embodiment is
As described in the above-mentioned Japanese Patent Application No. 3-358214, etc., the lifter 2 in an upright state as shown in FIG. 5 has a cavity defined by a projecting pin for projecting a product from a mold.
1 is integrally molded, and the lifter 21 in the upright state is bent to be formed. Further, at the time of molding, as is apparent from FIG. 5, the thin portion 21c of the lifter 21 is undercut, so that the protruding pin must be moved horizontally (left and right in the figure) and released. Dimensional control is difficult and thickness is likely to vary. However, according to this embodiment, as described above, a slight difference in thickness does not affect the pressing force, so that the occurrence of defects can be prevented and high production efficiency can be obtained.

【0017】また、この実施例のディスクカートリッジ
は、上述のような方法で成形する場合、アンダーカット
となる薄肉部21cの上縁部および押圧部21bの下縁
部がテーパ状に成形されているため、突出ピンの水平移
動、すなわち離型を円滑に行える。
When the disk cartridge of this embodiment is molded by the method described above, the upper edge of the thin portion 21c and the lower edge of the pressing portion 21b, which are undercuts, are tapered. Therefore, the horizontal movement of the projecting pin, that is, the mold release can be smoothly performed.

【0018】図6にはこの発明の他の実施例にかかるデ
ィスクカートリッジを示す。なお、この実施例および後
述する実施例では、上述した実施例と同一の部分には同
一の番号を付して説明を省略する。
FIG. 6 shows a disk cartridge according to another embodiment of the present invention. In this embodiment and the embodiments described later, the same parts as those in the above-mentioned embodiment are designated by the same reference numerals and the description thereof will be omitted.

【0019】この実施例は、図6に示すように、リフタ
21の根元部に開口窓部77を形成してリフタ21の根
元部の実質的な幅寸法を小さく、すなわち狭幅部21a
を形成したものである。そして、下ケース11の内面に
は、開口窓部77の両側に対応して2つの角度設定台2
6a,26bが形成される。
In this embodiment, as shown in FIG. 6, an opening window 77 is formed at the base of the lifter 21 to reduce the substantial width dimension of the base of the lifter 21, that is, the narrow width portion 21a.
Is formed. Then, on the inner surface of the lower case 11, two angle setting tables 2 corresponding to both sides of the opening window portion 77 are provided.
6a and 26b are formed.

【0020】図7にはこの発明のさらに他の実施例を示
す。同図に示すように、この実施例は、リフタ21を凹
部25を形成することなく、すなわち平面状の内面に一
体に形成し、また、リフタ21の根元部の倒れ方向側の
面に倒れやすくするための凹溝79を下ケース11の内
面と平行に形成したものである。
FIG. 7 shows still another embodiment of the present invention. As shown in the figure, in this embodiment, the lifter 21 is integrally formed on the inner surface of the flat surface without forming the recess 25, and the lifter 21 easily falls on the surface of the base of the lifter 21 on the falling direction side. The concave groove 79 for forming is formed parallel to the inner surface of the lower case 11.

【0021】[0021]

【発明の効果】以上説明したように、この発明にかかる
ディスクカートリッジによれば、リフタをケースと一体
形成し、リフタの根元を幅狭に成形したため、成形に高
い寸法精度が必要とせず、成形効率を改善できるように
なるという効果が得られる。
As described above, according to the disk cartridge of the present invention, since the lifter is integrally formed with the case and the base of the lifter is formed to have a narrow width, the molding does not require high dimensional accuracy and the molding is performed. The effect is that efficiency can be improved.

【図面の簡単な説明】[Brief description of drawings]

【図1】この発明の一実施例にかかるディスクカートリ
ッジの下ケースの平面図である。
FIG. 1 is a plan view of a lower case of a disk cartridge according to an embodiment of the present invention.

【図2】図1のII−II線矢視拡大断面図である。FIG. 2 is an enlarged sectional view taken along the line II-II of FIG.

【図3】図1のIII−III線矢視拡大断面図であ
る。
FIG. 3 is an enlarged cross-sectional view taken along the line III-III of FIG.

【図4】同ディスクカートリッジのリフタの拡大斜視図
である。
FIG. 4 is an enlarged perspective view of a lifter of the disc cartridge.

【図5】同下ケースの成形途中状態の一部断面図であ
る。
FIG. 5 is a partial cross-sectional view of the lower case in the middle of molding.

【図6】この発明の他の実施例にかかるディスクカート
リッジのリフタ廻りの拡大斜視図である。
FIG. 6 is an enlarged perspective view around a lifter of a disc cartridge according to another embodiment of the present invention.

【図7】この発明のまた他の実施例にかかるディスクカ
ートリッジのリフタ廻り部分の拡大断面図である。
FIG. 7 is an enlarged sectional view of a portion around a lifter of a disc cartridge according to still another embodiment of the present invention.

【符号の説明】[Explanation of symbols]

10 ケース 11 下ケース 12 ディスク 21 リフタ 21a 狭幅部(根元部) 21b 押圧部 10 Case 11 Lower Case 12 Disk 21 Lifter 21a Narrow Width Part (Root) 21b Pressing Part

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 ディスク状記録媒体を回転可能に収納す
る合成樹脂性のケース内面に前記ディスク状記録媒体を
押圧するリフタを立設したディスクカートリッジにおい
て、前記リフタを前記ケースと一体に成形するととも
に、前記リフタを根元部が押圧部よりも狭幅になるよう
に成形したことを特徴とするディスクカートリッジ。
1. A disk cartridge in which a lifter for pressing the disk-shaped recording medium is erected on an inner surface of a synthetic resin case that rotatably accommodates the disk-shaped recording medium, and the lifter is formed integrally with the case. A disk cartridge, wherein the lifter is formed such that a root portion thereof is narrower than a pressing portion.
【請求項2】 前記リフタは、その根元部に開口窓部が
形成されている請求項1に記載のディスクカートリッ
ジ。
2. The disk cartridge according to claim 1, wherein the lifter has an opening window portion formed at a root portion thereof.
JP4229593A 1991-06-21 1993-02-05 Disk cartridge Withdrawn JPH06231562A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP4229593A JPH06231562A (en) 1993-02-05 1993-02-05 Disk cartridge
US08/182,854 US5498456A (en) 1991-06-21 1994-01-18 Disc cartridge

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4229593A JPH06231562A (en) 1993-02-05 1993-02-05 Disk cartridge

Publications (1)

Publication Number Publication Date
JPH06231562A true JPH06231562A (en) 1994-08-19

Family

ID=12632054

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4229593A Withdrawn JPH06231562A (en) 1991-06-21 1993-02-05 Disk cartridge

Country Status (1)

Country Link
JP (1) JPH06231562A (en)

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