JPH0110781Y2 - - Google Patents
Info
- Publication number
- JPH0110781Y2 JPH0110781Y2 JP7573284U JP7573284U JPH0110781Y2 JP H0110781 Y2 JPH0110781 Y2 JP H0110781Y2 JP 7573284 U JP7573284 U JP 7573284U JP 7573284 U JP7573284 U JP 7573284U JP H0110781 Y2 JPH0110781 Y2 JP H0110781Y2
- Authority
- JP
- Japan
- Prior art keywords
- speed detection
- rotation speed
- upper drum
- magnet
- detection substrate
- 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
- 238000001514 detection method Methods 0.000 claims description 44
- 239000000758 substrate Substances 0.000 claims description 24
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 241000220317 Rosa Species 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K29/00—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices
- H02K29/14—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with speed sensing devices
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/42—Devices characterised by the use of electric or magnetic means
- G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
- G01P3/48—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage
- G01P3/481—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals
- G01P3/487—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals delivered by rotating magnets
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
- G11B15/60—Guiding record carrier
- G11B15/61—Guiding record carrier on drum, e.g. drum containing rotating heads
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
- G11B5/52—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with simultaneous movement of head and record carrier, e.g. rotation of head
- G11B5/53—Disposition or mounting of heads on rotating support
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
- G11B15/18—Driving; Starting; Stopping; Arrangements for control or regulation thereof
- G11B15/46—Controlling, regulating, or indicating speed
- G11B15/467—Controlling, regulating, or indicating speed in arrangements for recording or reproducing wherein both record carriers and heads are driven
- G11B15/473—Controlling, regulating, or indicating speed in arrangements for recording or reproducing wherein both record carriers and heads are driven by controlling the speed of the heads
- G11B15/4731—Controlling, regulating, or indicating speed in arrangements for recording or reproducing wherein both record carriers and heads are driven by controlling the speed of the heads control of headwheel rotation
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Brushless Motors (AREA)
Description
【考案の詳細な説明】
〔考案の利用分野〕
本考案はVTRやDAT用カセツトテープレコー
ダ等に備えられる回転シリンダに関する。[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a rotating cylinder provided in a VTR, DAT cassette tape recorder, etc.
第３図及び第４図ａ，ｂは従来の回転シリンダ
を示す説明図で、第３図は縦断面図、第４図ａは
モータ部分を例示する概略側面図、第４図ｂは第
４図ａの裏面図である。これらの図において、１
は可動部を形成する上ドラム、２は固定部を形成
する下ドラム、３は上ドラム１に装着されるヘツ
ド、４は上ドラム１を回転させるシヤフトであ
る。このシヤフト４は下ドラム２に装着された軸
受５に回転自在に支持されている。このシヤフト
４は垂直軸に対して傾斜するように配置され、す
なわち上ドラム１、下ドラム２を含む全体が垂直
軸に対して傾斜するように配置されている。な
お、６は上ドラム１に装着したロータリトランス
のロータ、７は下ドラム２に装着した当該ロータ
リトランスのステータである。また、８はコイ
ル、９はロータマグネツトで、このロータマグネ
ツト９はコイル８に対向するようにロータ１０に
装着されている。なお、上記したシヤフト４はロ
ータ１０に一体に保持されている。上記したコイ
ル８、ロータマグネツト９、ロータ１０、及びシ
ヤフト４は、上ドラム１を回転させるモータを構
成している。１１はロータマグネツト９の下部に
装着した回転数検出用マグネツト、１２は回転数
検出用基板で、この回転数検出用基板１２は端部
例えばモータのケーシング１３に装着してある。
この回転数検出用基板１２の回転数検出用マグネ
ツト１１に対向する側には第４図ｂに示すように
放射状の回路パターン１４が形成されている。
3 and 4 a and b are explanatory diagrams showing a conventional rotating cylinder, in which FIG. 3 is a vertical sectional view, FIG. 4 a is a schematic side view illustrating the motor part, and FIG. It is a back view of figure a. In these figures, 1
2 is an upper drum forming a movable part, 2 is a lower drum forming a fixed part, 3 is a head attached to the upper drum 1, and 4 is a shaft for rotating the upper drum 1. This shaft 4 is rotatably supported by a bearing 5 mounted on the lower drum 2. This shaft 4 is arranged so as to be inclined with respect to the vertical axis, that is, the entire shaft including the upper drum 1 and the lower drum 2 is arranged so as to be inclined with respect to the vertical axis. Note that 6 is a rotor of a rotary transformer mounted on the upper drum 1, and 7 is a stator of the rotary transformer mounted on the lower drum 2. Further, 8 is a coil, and 9 is a rotor magnet, and this rotor magnet 9 is attached to the rotor 10 so as to face the coil 8. Note that the shaft 4 described above is held integrally with the rotor 10. The above-described coil 8, rotor magnet 9, rotor 10, and shaft 4 constitute a motor that rotates the upper drum 1. Reference numeral 11 denotes a rotational speed detection magnet attached to the lower part of the rotor magnet 9. Numeral 12 denotes a rotational speed detection substrate, and this rotational speed detection substrate 12 is attached to an end portion, for example, a casing 13 of the motor.
A radial circuit pattern 14 is formed on the side of the rotation speed detection substrate 12 facing the rotation speed detection magnet 11, as shown in FIG. 4b.
この回転シリンダにあつては、モータを駆動す
ることによりシヤフト４を介して上ドラム１が回
転し、ヘツド３部分に周接される図示しないテー
プへの記録、あるいは再生をおこなうことができ
る。また、ロータマグネツト９の回転すなわちこ
のロータマグネツト９に一体に設けた回転数検出
用マグネツト１１の回転に応じて、当該回転数検
出用マグネツト１１の極数と回転数検出用基板１
２の回路パターン１４の放射線の数との関係によ
り、パルス信号が図示しない制御装置に出力さ
れ、これによつて上ドラム１の回転数が検出され
る。制御装置はこの回転数が適切な値となるよう
にモータ制御をおこなう。 In this rotary cylinder, by driving the motor, the upper drum 1 is rotated via the shaft 4, and recording or reproduction can be performed on a tape (not shown) circumferentially surrounding the head 3. Further, in accordance with the rotation of the rotor magnet 9, that is, the rotation of the rotation speed detection magnet 11 provided integrally with the rotor magnet 9, the number of poles of the rotation speed detection magnet 11 and the rotation speed detection substrate 1 are determined.
A pulse signal is output to a control device (not shown) according to the relationship with the number of radiations in the circuit pattern 14 of No. 2, and the rotation speed of the upper drum 1 is thereby detected. The control device controls the motor so that this rotational speed becomes an appropriate value.
ところで、このように構成してある回転シリン
ダにあつては、回転数検出用基板１２の基本形状
が第４図ａ，ｂに示すように平板リング状に形成
されていることから、第３図に示すように、この
回転シリンダをシヤーシ１５に取付けた場合、こ
の回転数検出用基板１２の傾斜側１８に位置する
縁部１２ａとシヤーシ１５との当接関係に伴つて
高さ寸法Ｈが大きくなり、当該回転シリンダが装
着される記録再生装置、例えばVTRの全体の高
さ寸法が大きくなり小型化を図れない不具合があ
る。 By the way, in the case of the rotating cylinder configured in this way, since the basic shape of the rotation speed detection substrate 12 is formed in a flat ring shape as shown in FIGS. 4a and 4b, FIG. As shown in , when this rotary cylinder is attached to the chassis 15, the height dimension H becomes large due to the abutting relationship between the chassis 15 and the edge 12a located on the inclined side 18 of this rotation speed detection substrate 12. Therefore, the overall height of the recording and reproducing apparatus, such as a VTR, to which the rotary cylinder is attached increases, and there is a problem that miniaturization cannot be achieved.
なお、回転数検出用マグネツト１１と回転数検
出用基板１２とによつて検出される回転数の検出
精度は、回転数検出用基板１２の回転数検出用マ
グネツト１１に対向する表面の平坦度に影響され
るため、この平坦度が全面にわたつて十分に確保
されるように回転数検出用基板１２を作製する必
要があり、それ故、従来にあつてはこの回転数検
出用基板１２の作製作業工数が増加し、製造原価
が高くなつていた。 The detection accuracy of the rotation speed detected by the rotation speed detection magnet 11 and the rotation speed detection substrate 12 depends on the flatness of the surface of the rotation speed detection substrate 12 facing the rotation speed detection magnet 11. Therefore, it is necessary to manufacture the rotation speed detection substrate 12 so that this flatness is sufficiently ensured over the entire surface. The number of man-hours required increased, and manufacturing costs rose.
本考案はこのような従来技術における実情に鑑
みてなされたもので、その目的は高さ寸法を小さ
くすることができるとともに、回転数検出用基板
の作製作業工数を抑制することのできる回転シリ
ンダを提供することにある。
The present invention was developed in view of the actual situation in the prior art, and its purpose is to create a rotating cylinder that can reduce the height dimension and reduce the number of man-hours required for manufacturing the rotation speed detection board. It is about providing.
この目的を達成するために本考案は、ヘツドが
装着され、可動部を形成する上ドラムと、この上
ドラムに対向して配置され、固定部を形成する下
ドラムと、上ドラムを回転させるモータと、この
モータに装着され、モータの回転に伴つて回転す
る回転数検出用マグネツトと、この回転数検出用
マグネツトに対向して端部に配置され、該回転数
検出用マグネツトの回転に応じて信号を出力する
回転数検出用基板とを備え、全体を垂直軸に対し
て傾斜して配置されるものにおいて、回転数検出
用基板の上述した傾斜側に位置する部分に切欠き
部を形成した構成にしてある。
To achieve this objective, the present invention consists of an upper drum to which a head is mounted and which forms a movable part, a lower drum which is placed opposite to this upper drum and forms a fixed part, and a motor which rotates the upper drum. and a rotation speed detection magnet that is attached to the motor and rotates as the motor rotates; A rotation speed detection substrate that outputs a signal, and the entire rotation speed detection substrate is arranged at an angle with respect to a vertical axis, and a notch is formed in the part of the rotation speed detection substrate located on the above-mentioned inclined side. It is configured.
以下、本考案の回転シリンダを図に基づいて説
明する。第１図及び第２図ａ，ｂは本考案の一実
施例を示す説明図で、第１図は縦断面図、第２図
ａはモータ部分を例示する概略側面図、第２図ｂ
は第２図ａの裏面図である。なお、これらの図に
おいて、前述した部材と同じものは同一符号で示
してある。すなわち、１は上ドラム、２は下ドラ
ム、３はヘツド、４はシヤフト、５は軸受、６，
７はそれぞれロータリトランスを形成するロー
タ、ステータ、８，９はモータを構成するコイ
ル、ロータマグネツト、１０はロータ、１１は回
転数検出用マグネツト、１３はモータのケーシン
グ、１５はこの回転シリンダが装着されるシヤー
シである。
Hereinafter, the rotating cylinder of the present invention will be explained based on the drawings. 1 and 2 a and b are explanatory diagrams showing one embodiment of the present invention, in which FIG. 1 is a longitudinal sectional view, FIG. 2 a is a schematic side view illustrating the motor part, and FIG. 2 b
is a back view of FIG. 2a. In these figures, the same members as those described above are designated by the same reference numerals. That is, 1 is the upper drum, 2 is the lower drum, 3 is the head, 4 is the shaft, 5 is the bearing, 6,
7 is a rotor and a stator forming a rotary transformer, 8 and 9 are coils and rotor magnets forming a motor, 10 is a rotor, 11 is a magnet for detecting rotation speed, 13 is a casing of the motor, and 15 is a rotary cylinder. This is the chassis that is installed.
また、これらの図において、１６は回転数検出
用マグネツト１１に対向するように配置される回
転数検出用基板で、第２図ｂに示すように一方の
側に切欠き部１７を形成してあり、この切欠き部
１７が第１図及び第２図ａに示すように当該回転
シリンダの傾斜側１８に位置するように、モータ
のケーシング１３に装着してある。なお、切欠き
部１７は例えば前述した第４図ｂに示す回転数検
出用基板１２の全体の1/2の大きさに設定してあ
る。また、回転数検出用基板１６の回転数検出用
マグネツト１１に対向する側には放射状の回路パ
ターン１９を形成してある。 In these figures, reference numeral 16 denotes a rotational speed detection substrate arranged to face the rotational speed detection magnet 11, with a notch 17 formed on one side as shown in FIG. 2b. The notch 17 is mounted on the casing 13 of the motor so that the notch 17 is located on the inclined side 18 of the rotating cylinder, as shown in FIGS. 1 and 2a. Note that the notch portion 17 is set to be, for example, half the size of the entire rotational speed detection substrate 12 shown in FIG. 4b described above. Further, a radial circuit pattern 19 is formed on the side of the rotation speed detection substrate 16 facing the rotation speed detection magnet 11.
この回転シリンダにあつては、前述した第３図
及び第４図ａ，ｂに示すものと同様に、モータの
駆動によつて上ドラム１が回転し、図示しないテ
ープへの記録、再生をおこなうことができる。ま
た、ロータマグネツト９と一体に回転する回転数
検出用マグネツト１１の回転に応じて、回転数検
出用基板１６の回路パターン１９に接続される図
示しないリード線を介してパルス信号が図示しな
い制御装置に出力され、モータの回転数すなわち
上ドラム１の回転数が検出されるようになつてい
る。 In this rotary cylinder, the upper drum 1 is rotated by the drive of the motor to perform recording and playback on a tape (not shown), similar to those shown in FIGS. 3 and 4 a and b described above. be able to. Further, in accordance with the rotation of the rotation speed detection magnet 11 that rotates together with the rotor magnet 9, a pulse signal is sent to a control (not shown) via a lead wire (not shown) connected to a circuit pattern 19 of the rotation speed detection board 16. The rotational speed of the motor, that is, the rotational speed of the upper drum 1, is output to the device and detected.
このように構成してある回転シリンダにあつて
は、上述したように回転数検出用基板１６の当該
回転シリンダの傾斜側１８に位置する部分に切欠
き部１７を設けてあることから、回転数検出用基
板１６がシヤーシ１５に接触することはなく、し
たがつて回転数検出用マグネツト１１がシヤーシ
１５に接触しない範囲において、その高さ寸法
H0を小さく設定することができる。 In the case of the rotating cylinder configured in this way, since the notch 17 is provided in the portion of the rotational speed detection substrate 16 located on the inclined side 18 of the rotating cylinder as described above, the rotational speed can be determined. In the range where the detection substrate 16 does not come into contact with the chassis 15 and therefore the rotation speed detection magnet 11 does not come into contact with the chassis 15, its height dimension
H 0 can be set small.
また、回転数検出用基板１６の切欠き部１７の
大きさは第４図ｂに示す回転数検出用基板１２の
全体の1/2に設定してあるので、同第４図ｂに示
すように全体が平板リング状に形成されたものに
比べれば、その表面の平坦度の確保が容易であ
り、それ故この回転数検出用基板１６の作製作業
工数を抑制することができる。 In addition, the size of the notch 17 of the rotation speed detection substrate 16 is set to 1/2 of the entire rotation speed detection substrate 12 shown in FIG. 4b, so as shown in FIG. Compared to the case where the entire surface is formed into a flat ring shape, it is easier to ensure the flatness of the surface, and therefore the number of man-hours for manufacturing the rotation speed detection substrate 16 can be reduced.
なお、上記実施例では、切欠き部１７の大きさ
を第４図ｂに示す回転数検出用基板１２の全体の
１／２に設定してあるが、本考案はこれに限定され
ず、必要に応じてこの切欠き部１７の大きさを当
該全体の1/3、2/3、3/4等に設定することができ
る。 In the above embodiment, the size of the notch 17 is set to 1/2 of the entire rotation speed detection substrate 12 shown in FIG. 4b, but the present invention is not limited to this, and may be Depending on the size, the size of the notch 17 can be set to 1/3, 2/3, 3/4, etc. of the whole.
本考案の回転シリンダは上記のように構成して
あることから、高さ寸法を小さくすることがで
き、したがつてこの回転シリンダが装着される記
録再生装置の小型化を図ることのできる効果があ
る。また、回転数検出用基板の作製作業工数を抑
制でき、したがつて従来に比べて製造原価を安く
することのできる効果も奏する。
Since the rotating cylinder of the present invention is configured as described above, the height dimension can be reduced, and therefore, the recording/reproducing device to which this rotating cylinder is installed can be miniaturized. be. Further, the number of man-hours required for manufacturing the rotation speed detection substrate can be suppressed, and the manufacturing cost can therefore be reduced compared to the conventional method.
第１図及び第２図ａ，ｂは本考案の回転シリン
ダの一実施例を示す説明図で、第１図は縦断面
図、第２図ａはモータ部分を例示する概略側面
図、第２図ｂは第２図ａの裏面図、第３図及び第
４図ａ，ｂは従来の回転シリンダを示す説明図
で、第３図は縦断面図、第４図ａはモータ部分を
例示する概略側面図、第４図ｂは第４図ａの裏面
図である。
１……上ドラム、２……下ドラム、３……ヘツ
ド、９……ロータマグネツト、１１……回転数検
出用マグネツト、１３……ケーシング、１６……
回転数検出用基板、１７……切欠き部、１８……
傾斜側、１９……回路パターン。
1 and 2 a and b are explanatory diagrams showing one embodiment of the rotating cylinder of the present invention, in which FIG. 1 is a longitudinal sectional view, FIG. 2 a is a schematic side view illustrating the motor part, and FIG. Figure b is a back view of Figure 2 a, Figures 3 and 4 a and b are explanatory diagrams showing a conventional rotating cylinder, Figure 3 is a longitudinal sectional view, and Figure 4 a illustrates the motor part. The schematic side view, FIG. 4b, is a back view of FIG. 4a. DESCRIPTION OF SYMBOLS 1... Upper drum, 2... Lower drum, 3... Head, 9... Rotor magnet, 11... Rotation speed detection magnet, 13... Casing, 16...
Rotation speed detection board, 17... Notch, 18...
Slope side, 19...Circuit pattern.
Claims (1)
と、この上ドラムに対向して配置され、固定部を
形成する下ドラムと、上記上ドラムを回転させる
モータと、該モータに装着され、該モータの回転
に伴つて回転する回転数検出用マグネツトと、こ
の回転数検出用マグネツトに対向して端部に配置
され、該回転数検出用マグネツトの回転に応じて
信号を出力する回転数検出用基板とを備え、全体
を垂直軸に対して傾斜して配置される回転シリン
ダにおいて、上記回転数検出用基板の上記傾斜側
に位置する部分に切欠き部を形成したことを特徴
とする回転シリンダ。 an upper drum to which the head is mounted and which forms a movable part; a lower drum which is disposed opposite to the upper drum and forms a fixed part; a motor which rotates the upper drum; a rotation speed detection magnet that rotates as the rotation speed detection magnet rotates, and a rotation speed detection substrate that is disposed at an end facing the rotation speed detection magnet and outputs a signal in accordance with the rotation of the rotation speed detection magnet. A rotary cylinder, the rotary cylinder being arranged as a whole at an angle with respect to a vertical axis, characterized in that a notch is formed in a portion of the rotation speed detection substrate located on the tilted side.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7573284U JPS60192115U (en) | 1984-05-25 | 1984-05-25 | rotating cylinder |
| GB08502122A GB2159279B (en) | 1984-05-25 | 1985-01-29 | Rotary cylinder structures |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7573284U JPS60192115U (en) | 1984-05-25 | 1984-05-25 | rotating cylinder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60192115U JPS60192115U (en) | 1985-12-20 |
| JPH0110781Y2 true JPH0110781Y2 (en) | 1989-03-28 |
Family
ID=13584733
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7573284U Granted JPS60192115U (en) | 1984-05-25 | 1984-05-25 | rotating cylinder |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPS60192115U (en) |
| GB (1) | GB2159279B (en) |
-
1984
- 1984-05-25 JP JP7573284U patent/JPS60192115U/en active Granted
-
1985
- 1985-01-29 GB GB08502122A patent/GB2159279B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| GB8502122D0 (en) | 1985-02-27 |
| GB2159279A (en) | 1985-11-27 |
| JPS60192115U (en) | 1985-12-20 |
| GB2159279B (en) | 1988-10-26 |
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