JPH04101913U - Rotating magnetic head device - Google Patents
Rotating magnetic head deviceInfo
- Publication number
- JPH04101913U JPH04101913U JP851991U JP851991U JPH04101913U JP H04101913 U JPH04101913 U JP H04101913U JP 851991 U JP851991 U JP 851991U JP 851991 U JP851991 U JP 851991U JP H04101913 U JPH04101913 U JP H04101913U
- Authority
- JP
- Japan
- Prior art keywords
- head
- magnetic head
- screw
- drum
- rotating
- 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
- 230000000694 effects Effects 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 238000004026 adhesive bonding Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
Abstract
(57)【要約】
【目的】 ヘッド取付ねじとヘッドあおりねじとの間隔
を十分に大きくしながらも磁気ヘッドのドラム半径方向
の大きさを小さくし、回転磁気ヘッド装置を小型化をす
る。
【構成】 ヘッド取付けねじ３とヘッドあおりねじ４と
を回転ドラム１の同一法線上に配置せずに回転ドラム１
のほぼ回転方向に並べて配置するようにしている。
(57) [Summary] [Purpose] To reduce the size of the magnetic head in the drum radial direction while sufficiently increasing the distance between the head mounting screw and the head tilting screw, thereby downsizing the rotating magnetic head device. [Configuration] The head mounting screw 3 and the head tilting screw 4 are not placed on the same normal line of the rotating drum 1.
They are arranged in approximately the direction of rotation.
Description
【０００１】0001
本考案は回転磁気ヘッド装置に関する。更に詳述すると、本考案は回転磁気ヘ ッド装置の磁気ヘッド及びこの磁気ヘッドを回転ドラムに対し取付ける構造の改 良に関する。 The present invention relates to a rotating magnetic head device. More specifically, the present invention is based on a rotating magnetic head. Improvements to the magnetic head of the head device and the structure for attaching this magnetic head to the rotating drum. Regarding good.
【０００２】0002
磁気ヘッドをドラムに取付け一体にして回転させるタイプの回転磁気ヘッド装 置としては、従来、図７及び図８に示すようなものが同軸上に相対向する２個の ドラムのいずれか一方のドラム例えば上ドラム１０１に磁気ヘッド１０２をヘッ ド取付ねじ１０３によって取付け、ヘッドあおりねじ１０４でヘッドの取付角度 を調整するように設けられている。磁気ヘッド１０２はヘッドチップ１０２ａと このヘッドチップ１０２ａを支持しヘッド配線基板１０７を設けたヘッドベース １０２ｂとから成り、ヘッドチップ１０２ａのコイル窓に巻回されたコイルとロ ータリトランス１０５の回転側部材１０５ａのコイルとがヘッドベース１０２ｂ 上の配線基板１０７を介して接続されている。磁気ヘッド１０２は上ドラム１０ １の側面のヘッド取付面１０６に、ヘッド取付ねじ１０３とヘッドあおりねじ１ ０４とが上ドラム１０１の周面を通る同一法線上に配置されて、上ドラム１０１ と下ドラム１０８の間からヘッドチップ１０２ａがドラム周面から突き出るよう に固定されている。あおりねじ１０４は上ドラム１０１のヘッド取付面１０６の 反対側の面から回すことによって磁気ヘッド１０２側へ突出させ、ヘッドベース １０２ｂを撓ませてヘッドの取付角度を調整するようにしている。尚、符号１０ ９はモータであり、ロータマグネット１１０を取付けたロータケース１１１とコ イル１１２を巻回したステータコア１１３とから成り、上ドラム１０１を支持す るドラム軸１１４にロータケース１１１を固着して回転させるようにしている。 A rotating magnetic head device in which the magnetic head is attached to a drum and rotates as an integral part. Conventionally, as shown in Figs. 7 and 8, two coaxially facing A magnetic head 102 is attached to one of the drums, for example, the upper drum 101. Mount with the head mounting screw 103, and adjust the head mounting angle with the head tilting screw 104. It is designed to adjust. The magnetic head 102 has a head chip 102a and A head base that supports this head chip 102a and is provided with a head wiring board 107. 102b, and a coil wound around the coil window of the head chip 102a and a rotor. The coil of the rotating side member 105a of the secondary transformer 105 is connected to the head base 102b. They are connected via the upper wiring board 107. The magnetic head 102 is attached to the upper drum 10 Attach the head mounting screw 103 and head tilting screw 1 to the head mounting surface 106 on the side of 1. 04 are arranged on the same normal line passing through the circumferential surface of the upper drum 101, and the upper drum 101 and the lower drum 108 so that the head chip 102a protrudes from the drum circumferential surface. Fixed. The tilt screw 104 is attached to the head mounting surface 106 of the upper drum 101. By turning it from the opposite side, the head base is made to protrude toward the magnetic head 102 side. 102b is bent to adjust the mounting angle of the head. In addition, code 10 9 is a motor, which is connected to a rotor case 111 to which a rotor magnet 110 is attached. It consists of a stator core 113 around which a coil 112 is wound, and supports the upper drum 101. The rotor case 111 is fixed to the drum shaft 114 and rotated.
【０００３】0003
しかしながら、このヘッド取付構造によると、磁気ヘッド１０２のドラム半径 方向の大きさＡはヘッド取付ねじ１０３とヘッドあおりねじ１０４とが上ドラム １０１の周面を通る同一法線上に配置されているため、少なくともヘッド取付ね じ１０３とヘッドあおりねじ１０４とを喰い違わせて配置する程度の大きさを必 要とし、それよりも小さくすることができない。しかも、ヘッド取付ねじ１０３ とヘッドあおりねじ１０４との間の距離Ｂは、短すぎると、取付角度を調整する あおり時のモーメント荷重が増加して取付角度調整がしずらくなり、またヘッド の永久変形等が懸念されることからあまり短くできない。したがって、磁気ヘッ ド１０２のドラム半径方向の大きさＡ及びヘッド取付ねじ１０３とヘッドあおり ねじ１０４との間のスペースＢを十分にとらなければならないため、ドラム外径 寸法をあまり小さくすることができない。 However, according to this head mounting structure, the drum radius of the magnetic head 102 The size A in the direction is that the head mounting screw 103 and the head tilting screw 104 are connected to the upper drum. Since they are arranged on the same normal line passing through the circumferential surface of 101, at least the head installation The size must be large enough to place the same 103 and the head tilting screw 104 at different positions. It cannot be made smaller than that. Moreover, the head mounting screw 103 If the distance B between and the head tilting screw 104 is too short, adjust the mounting angle. The moment load increases during tilting, making it difficult to adjust the mounting angle, and the head It cannot be made too short due to concerns about permanent deformation. Therefore, the magnetic head Drum radial size A of door 102, head mounting screw 103 and head tilt Since a sufficient space B must be provided between the drum and the screw 104, the outer diameter of the drum must be It is not possible to reduce the size too much.
【０００４】 本考案は、ヘッド取付ねじとヘッドあおりねじとの間隔を十分に大きくし、尚 かつ磁気ヘッドのドラム半径方向の大きさを小さくして回転磁気ヘッド装置の小 型化を可能とする回転磁気ヘッド装置を提供することを目的とする。0004 In this invention, the distance between the head mounting screw and the head tilting screw is sufficiently large, and In addition, by reducing the size of the magnetic head drum in the radial direction, the size of the rotating magnetic head device can be reduced. An object of the present invention is to provide a rotary magnetic head device that can be molded into a mold.
【０００５】[0005]
かかる目的を達成するため、本考案は、回転ドラムと磁気ヘッドと取付ねじと あおりねじとを有し、上記磁気ヘッドを上記取付ねじで上記回転ドラムの側面に 固定保持すると共に上記回転ドラムに保持されて上記回転ドラムの回転軸方向に 移動自在なあおりねじを上記磁気ヘッドに当接付勢する回転磁気ヘッド装置にお いて、上記取付ねじと上記あおりねじとは上記回転ドラムの略回転方向に並んで 位置するようにしている。 In order to achieve this purpose, the present invention combines a rotating drum, a magnetic head, a mounting screw, and The magnetic head is attached to the side of the rotating drum using the mounting screw. It is fixedly held and held by the rotating drum in the direction of the rotating axis of the rotating drum. A rotating magnetic head device that biases a movable tilting screw into contact with the magnetic head. The above-mentioned mounting screw and the above-mentioned tilting screw are lined up approximately in the rotation direction of the above-mentioned rotating drum. I'm trying to locate it.
【０００６】[0006]
したがって、ヘッド取付ねじとヘッドあおりねじとは回転ドラムの中心からほ ぼ同一位置に配置され、あおりねじとヘッド取付ねじとを離して配置しても磁気 ヘッドのドラム半径方向の寸法Ａには影響を与えない。 Therefore, the head mounting screw and head tilting screw are located approximately from the center of the rotating drum. Even if the tilt screw and head mounting screw are placed apart, the magnetic The dimension A of the head in the drum radial direction is not affected.
【０００７】[0007]
【実施例】 以下、本考案の構成を図面に示す実施例に基づいて詳細に説明する。尚、本実 施例は、下ドラムにモータを内蔵し、上ドラム側に磁気ヘッドを取付けて回転さ せる図６に示すようなタイプの回転磁気ヘッド装置に適用した場合について示す 。【Example】 EMBODIMENT OF THE INVENTION Hereinafter, the structure of this invention will be explained in detail based on the Example shown in drawing. Furthermore, the truth In this example, a motor is built into the lower drum, and a magnetic head is attached to the upper drum to rotate it. A case where the present invention is applied to a rotating magnetic head device of the type shown in FIG. 6 is shown. .
【０００８】 まず、回転磁気ヘッド装置としての全体の構造について述べる。本考案の回転 磁気ヘッド装置は、特に図示していないが、モータを内蔵する固定ドラムと前記 モータによって駆動される回転ドラムとから成り、固定ドラムと回転ドラムとを 同軸上に配置してそれらの間の隙間からヘッドチップを突き出してテープと接触 させるようにしている。回転ドラム例えば上ドラムと共に回転する磁気ヘッドと 固定ドラム（下ドラム）側の信号処理系とはロータリトランスを介して接続され ている。また、ロータリトランスの回転側部材と磁気ヘッドのヘッドチップとは 例えばヘッドベース上の配線基板を介して接続されている。[0008] First, the overall structure of the rotating magnetic head device will be described. Rotation of this invention Although not particularly shown, the magnetic head device consists of a fixed drum with a built-in motor and the aforementioned It consists of a rotating drum driven by a motor, and a fixed drum and a rotating drum. Arrange them coaxially and protrude the head chip from the gap between them to make contact with the tape. I try to let them do it. A magnetic head that rotates with a rotating drum, such as an upper drum. It is connected to the signal processing system on the fixed drum (lower drum) side via a rotary transformer. ing. Also, what are the rotating side members of a rotary transformer and the head chip of a magnetic head? For example, they are connected via a wiring board on the head base.
【０００９】 例えば、図１〜図３に示すように、磁気ヘッド２は、ヘッドチップ２ａと、該 チップ２ａを固着すると共にヘッド配線基板２ｃを設置したヘッドベース２ｂと から成り、取付手段例えばヘッド取付ねじ３によって回転ドラム１に固定されて いる。ヘッド配線基板２ｃにはヘッドチップ２ａに巻回されたヘッドワイヤを接 続する第１のランド５ａとロータリトランスの回転側部材のトランスコイルを接 続するための第２のランド５ｂ及びこれらを接続する引回し半田部分５ｃとを有 する。このヘッドベース２ｂは回転ドラム１に取付けた状態において回転ドラム １の径方向に短く、円周方向に長くなるように横長に形成され、短い縦方向にヘ ッドチップ２ａが固着されている。そして、その長手方向の一方の端部にヘッド 取付ねじ３を挿通して回転ドラム１に固着するようにし、ヘッドチップ２ａのエ アギャップ部分を通過する法線上にヘッドあおりねじ４が位置するようにヘッド あおりねじ４を配置している。ヘッドあおりねじ４は回転ドラム１に埋設され、 回転ドラム１のヘッド取付面６の反対側の面から回すことによって軸方向に自在 に出入りし得るように設けられている。[0009] For example, as shown in FIGS. 1 to 3, the magnetic head 2 includes a head chip 2a and a head chip 2a. A head base 2b to which a chip 2a is fixed and a head wiring board 2c is installed; It is fixed to the rotating drum 1 by means of a mounting means, for example, a head mounting screw 3. There is. A head wire wound around the head chip 2a is connected to the head wiring board 2c. Connect the first land 5a and the transformer coil of the rotating side member of the rotary transformer. It has a second land 5b for connection and a routing solder portion 5c for connecting these. do. This head base 2b is attached to the rotating drum 1. 1 is formed horizontally so that it is short in the radial direction and long in the circumferential direction, and is short in the vertical direction. A head chip 2a is fixed thereto. and a head at one longitudinal end of it. Insert the mounting screw 3 so that it is fixed to the rotating drum 1, and then Adjust the head so that the head tilting screw 4 is located on the normal line passing through the gap part. A tilt screw 4 is arranged. The head tilting screw 4 is embedded in the rotating drum 1, It can be rotated freely in the axial direction by turning from the surface opposite to the head mounting surface 6 of the rotating drum 1. It is set up so that you can go in and out.
【００１０】 したがって、回転ドラム１にヘッド取付ねじ３を以ってヘッド２を取付けた後 、ヘッドあおりねじ４を回してその突出量を調整することによってヘッド２の取 付角度が調整される。このとき、ヘッド２は図５に示すように、ヘッドベース２ ｂが回転ドラム１の円周方向において撓むためアジマス角度がずれることになる 。例えば、アジマス角は基準アジマス角（例えば２０°）にあおり調整によるず れ角αを加算したものとして表れる。このアジマス角αのずれは、アジマス角の ずれと出力レベルの減衰量との関係を示す図４から明らかなように、ずれ量が増 えるほどヘッド出力の低下が増大し、かつそれも周波数が高くなるほどその影響 が大きくなる傾向にある。しかしながら、例えばデジタルオーディオテープレコ ーダ（ＤＡＴ）に用いられる回転磁気ヘッド装置においては、ヘッドのあおり量 は通常１０μｍ程度であるので、アジマス角ずれは０．１°程度になる。しかし 、ＤＡＴが使われる周波数領域（ｆ＝０．１３，１．２，４，７ＭＨｚ）程度で はあおり角度即ちアジマス角のずれが５°でも僅か０．２ｄＢ程度であることか ら、アジマス角すれが０．１°程度におけるヘッド出力の低下は実用上全く問題 にならない。尚、図４においてアジマス角のずれ量が０°のときは基準アジマス 角に相当する。また、ヘッド２の取付角度の調整の後、上ドラムに接着等により 固着されたロータリトランスの回転側部材のトランスコイルがヘッドベース上の 配線基板の第２ランドに半田付け等、種々の方法で回転ヘッドのコイルと電気的 に接続される。0010 Therefore, after attaching the head 2 to the rotating drum 1 with the head attaching screw 3, , the head 2 can be removed by turning the head tilting screw 4 and adjusting its protrusion amount. The attached angle is adjusted. At this time, the head 2 is connected to the head base 2 as shown in FIG. Since b is bent in the circumferential direction of the rotating drum 1, the azimuth angle will shift. . For example, the azimuth angle is the standard azimuth angle (for example, 20°) due to tilt adjustment. It appears as the sum of the deflection angle α. This deviation of the azimuth angle α is the difference between the azimuth angle As is clear from Figure 4, which shows the relationship between the deviation and the amount of output level attenuation, the amount of deviation increases. The lower the frequency, the greater the drop in head output, and the higher the frequency, the greater the effect. tends to become larger. However, for example, digital audio tape records In the rotating magnetic head device used for the reader (DAT), the amount of head tilting is is usually about 10 μm, so the azimuth angle deviation is about 0.1°. but , in the frequency range where DAT is used (f = 0.13, 1.2, 4, 7MHz) Even if the deviation of the tilt angle, that is, the azimuth angle, is 5 degrees, it is only about 0.2 dB. Therefore, the decrease in head output when the azimuth angle misalignment is about 0.1° is completely problematic in practice. do not become. In addition, in Fig. 4, when the amount of deviation of the azimuth angle is 0°, it is the standard azimuth. Corresponds to a corner. Also, after adjusting the mounting angle of head 2, attach it to the upper drum by gluing it etc. The transformer coil of the rotating side member of the fixed rotary transformer is placed on the head base. Connect the coil of the rotating head electrically by various methods such as soldering to the second land of the wiring board. connected to.
【００１１】 尚、上述の実施例は本考案の好適な実施の一例ではあるがこれに限定されるも のではなく本考案の要旨を逸脱しない範囲において種々変形実施可能である。例 えば、あおりねじ４の位置はヘッドチップ２ａと同じ法線上に配置される必要は なく、図５に示すようにヘッドチップ２ａの位置から回転ドラム１の円周方向に 離れてヘッド取付ねじ３から大きく離れた位置に設置することも可能である。こ の場合、ヘッド取付角度を調整するときのあおり時のモーメント荷重が小さくな るため、ヘッドの取付角度の調整が容易になるし、ヘッドの永久変形等の懸念も 少ない。[0011] The above-mentioned embodiment is an example of preferred implementation of the present invention, but is not limited thereto. Rather, various modifications can be made without departing from the gist of the present invention. example For example, the position of the tilt screw 4 does not need to be placed on the same normal line as the head chip 2a. 5, in the circumferential direction of the rotating drum 1 from the position of the head chip 2a. It is also possible to install it at a position far away from the head mounting screw 3. child In this case, the moment load during tilting when adjusting the head mounting angle becomes smaller. This makes it easier to adjust the mounting angle of the head, and there is no need to worry about permanent deformation of the head. few.
【００１２】0012
以上の説明より明らかなように、本考案の回転磁気ヘッド装置は、ヘッド取付 ねじとヘッドあおりねじとを回転ドラムの同一法線上に配置せずに回転ドラムの ほぼ回転方向に並べて配置するようにしたので、ヘッド取付ねじとヘッドあおり ねじとは回転ドラムの中心からほぼ同一位置に配置され、あおりねじとヘッド取 付ねじとを離して配置しても磁気ヘッドのドラム半径方向の寸法Ａには影響を与 えないことから十分なＢ寸法を確保しても、従来必要とされていたヘッド取付ね じとヘッドあおりねじとの間隔Ｂ分だけは少なくとも磁気ヘッドのドラム半径方 向の寸法Ａを小さくすることができる。したがって、この回転磁気ヘッド装置は 磁気ヘッドのＡ寸法を小さくしてドラムの小径化が可能となるし、Ｂ寸法も十分 に確保できるためモーメント荷重が低減できて取付角度の調整が容易となるし、 磁気ヘッドの永久変形の防止にも効果的である。更に、この回転磁気ヘッド装置 によるとヘッドあおりねじの位置を設定する際の自由度が大きくなる。 As is clear from the above explanation, the rotating magnetic head device of the present invention has a of the rotating drum without placing the screw and the head tilting screw on the same normal line of the rotating drum. Since they are arranged side by side in the direction of rotation, the head mounting screws and head tilting The screws are located at almost the same position from the center of the rotating drum, and the tilting screws and head mounting screws Even if the magnetic head is placed apart from the mounting screw, the radial dimension A of the magnetic head will not be affected. Therefore, even if sufficient B dimension is secured, the head installation that was previously required will not be possible. At least the distance B between the magnetic head and the head tilting screw is in the radial direction of the drum of the magnetic head. The dimension A in the direction can be made smaller. Therefore, this rotating magnetic head device It is possible to reduce the diameter of the drum by reducing the A dimension of the magnetic head, and the B dimension is also sufficient. The moment load can be reduced and the installation angle can be easily adjusted. It is also effective in preventing permanent deformation of the magnetic head. Furthermore, this rotating magnetic head device According to this, the degree of freedom when setting the position of the head tilting screw increases.
【図１】本考案に係る回転磁気ヘッド装置の一実施例を
示す磁気ヘッド及びそれの回転ドラムへの取付状態を示
す底面図である。FIG. 1 is a bottom view showing a magnetic head showing an embodiment of a rotating magnetic head device according to the present invention and a state in which the magnetic head is attached to a rotating drum.
【図２】図１のII−II線断面図である。FIG. 2 is a sectional view taken along line II-II in FIG. 1.
【図３】図１のIII −III 線断面図である。FIG. 3 is a sectional view taken along the line III-III in FIG. 1;
【図４】アジマス角度のずれと磁気ヘッドの出力低下と
の関係とを示すグラフである。FIG. 4 is a graph showing the relationship between azimuth angle deviation and decrease in output of the magnetic head.
【図５】本考案の他の実施例で、磁気ヘッドと各ねじと
の配置関係を図１のIII −III 線に沿って示す断面図で
ある。5 is a cross-sectional view showing the arrangement relationship between a magnetic head and each screw along line III-III in FIG. 1 in another embodiment of the present invention; FIG.
【図６】従来の回転磁気ヘッドの概略構造を示す中央縦
断面図である。FIG. 6 is a central vertical cross-sectional view showing a schematic structure of a conventional rotary magnetic head.
【図７】従来のヘッド取付構造を示す底面図である。FIG. 7 is a bottom view showing a conventional head mounting structure.
【図８】図７のVIII−VIII線断面図である。8 is a sectional view taken along line VIII-VIII of FIG. 7. FIG.
１ 回転ドラム ２ ヘッド ２ａ ヘッドチップ ２ｂ ヘッドベース ３ ヘッド取付ねじ ４ ヘッドあおりねじ 1 Rotating drum 2 head 2a head chip 2b head base 3 Head mounting screw 4 Head tilting screw
Claims (1)
おりねじとを有し、上記磁気ヘッドを上記取付ねじで上
記回転ドラムの側面に固定保持すると共に上記回転ドラ
ムに保持されて上記回転ドラムの回転軸方向に移動自在
なあおりねじを上記磁気ヘッドに当接付勢する回転磁気
ヘッド装置において、上記取付ねじと上記あおりねじと
は上記回転ドラムの略回転方向に並んで位置することを
特徴とする回転磁気ヘッド装置。1. A rotating drum, a magnetic head, a mounting screw, and a tilting screw, wherein the magnetic head is fixedly held on a side surface of the rotating drum by the mounting screw, and is held by the rotating drum so that the magnetic head is fixedly held on the side surface of the rotating drum by the mounting screw. A rotary magnetic head device in which a tilting screw movable in the direction of the rotational axis is brought into contact with and biased against the magnetic head, characterized in that the mounting screw and the tilting screw are located side by side substantially in the rotational direction of the rotating drum. A rotating magnetic head device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP851991U JPH04101913U (en) | 1991-01-30 | 1991-01-30 | Rotating magnetic head device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP851991U JPH04101913U (en) | 1991-01-30 | 1991-01-30 | Rotating magnetic head device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04101913U true JPH04101913U (en) | 1992-09-02 |
Family
ID=31740921
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP851991U Pending JPH04101913U (en) | 1991-01-30 | 1991-01-30 | Rotating magnetic head device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04101913U (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59144029A (en) * | 1983-02-07 | 1984-08-17 | Victor Co Of Japan Ltd | Assembled body of video head |
| JPS62279512A (en) * | 1986-05-29 | 1987-12-04 | Matsushita Electric Ind Co Ltd | Rotary head device |
-
1991
- 1991-01-30 JP JP851991U patent/JPH04101913U/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59144029A (en) * | 1983-02-07 | 1984-08-17 | Victor Co Of Japan Ltd | Assembled body of video head |
| JPS62279512A (en) * | 1986-05-29 | 1987-12-04 | Matsushita Electric Ind Co Ltd | Rotary head device |
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