JPH02101660A - Recording or reproducing device - Google Patents

Abstract

PURPOSE:To drastically reduce power consumption by providing a means which detects the starting edge part of a medium and a means which detects the terminal edge part of the medium in a device which executes the recording or reproduction of the recording medium while driving it and intermittently controlling the operation/ inoperation of the means in a cycle corresponding to the driving speed of the medium. CONSTITUTION:An input operation part 33 is provided in the recording/reproducing device 49. Based on a signal which is generated and given through a line 32 by the operation of a key in the operation part 33, a control circuit 18 outputs a control signal to a tape traveling driving circuit 19 through a line 31 and controls the traveling speed of the tape. That means, the control signal is outputted from the terminal A of the circuit 18 and detection signals from sensors 16 and 17 are outputted from the terminals B and C. Then, the sensor 16 detects the terminal edge of the tape and the sensor 17 detects the starting edge of the tape and they are respectively constituted of light emitting elements 20 and 28 and light receiving elements 21 and 27. In such a way, by outputting a stopping operation request signal from the circuit 19, recording, fast forwarding, reproduction, rewinding or the like is controlled by the device 49.

Description

[Detailed description of the invention]

Industrial Field of Application The present invention is applicable to recording on recording media such as magnetic tapes,
・Regarding a playback device, more specifically, a recording or playback device that detects the beginning and end of a recording medium.
Regarding JA placement. 2. Description of the Related Art Conventionally, a device such as a video tape or digital audio tape that records or plays back on a magnetic tape housed in a cassette, the ends of which are wound around a pair of reels, has been used. has been put into practical use. Such a device is disclosed, for example, in Japanese Patent Application Laid-Open No. 62-252563. In this magnetic recording and reproducing apparatus, a magnetic tape coated with a magnetic substance is run by a driving means, and signals are recorded or reproduced on the magnetic tape using magnetism. At the beginning and end of a magnetic tape used in such a magnetic recording and reproducing apparatus, a light-transmitting part, which is not coated with magnetic material and is called a leader chip 1 or a trailer tear, is provided. A magnetic recording/reproducing device is usually equipped with an optical sensor for detecting the starting edge and an optical sensor for detecting the ending edge, each of which includes a light emitting element and a light receiving element.
) The light-shielding magnetic tape coated with a magnetic material and the light-transmitting portion are detected based on the amount of light transmitted from the light-emitting element. As a result, the beginning and end of the magnetic tape are detected. In this way, the magnetic recording and reproducing apparatus can be operated in a straight line in which the magnetic tape is completely rewound or completely forwarded.
The magnetic tape is configured to stop or reverse the running of the magnetic tape. This prevents the magnetic tape from warping or breaking due to excessive tension being applied to the magnetic tape. Problems to be Solved by the Invention Regarding the above-mentioned UCC internal force technology magnetic recording/playback device,
The optical sensor sensor for detecting the starting edge and the optical sensor sensor for detecting the ending edge are always driven when the device is powered on, and the multiplication element is lit. For this reason, such a magnetic recording/recording device requires electric power to constantly turn on the light emitting element, leading to a problem of increased power consumption. An object of the present invention is to provide a recording or reproducing device that can solve the above technical problems and significantly reduce power consumption. Means for Solving the Problems The present invention provides an apparatus for recording or reproducing by driving a recording medium, comprising: a starting edge detection means for detecting a starting edge of the recording medium; and a starting edge detecting means for detecting a starting edge of the recording medium. The controlling means detects the starting end at a period corresponding to the driving speed of the recording medium, and the control means controls the operation of the starting end detecting means and the ending end detecting means. Operation of the end portion detection means and end portion detection means/'
This is a recording or reproducing device characterized by intermittently controlling non-fishing operations. 1) In the recording or reproducing apparatus according to the present invention, the starting edge detection means and the trailing edge detection means detect the recording medium f) lfl end and the trailing edge, respectively. The operations of the start end detection means and the end end detection means are controlled by control signals from the control means. According to the present invention, the control means controls the operation 2' by switching the operation ft: to 1- at intervals corresponding to the driving speed of the recording medium. As mentioned above, the starting end detection means and the ending end detection means are constantly operated (
Power consumption can be reduced compared to case H where the power consumption is reduced. Also, for example, the faster the driving speed of the recording medium, the more
Starting end detection '1'=movement of step length and end end detection means jl=
, 'By shortening the period of the stationary 1 ya -), the stationary 1
It is possible to control the prefectural location of the recording medium during the start period. Embodiment No. 10 is a system diagram of an actual example of the 16th embodiment of the present invention, without showing the structure near the recording and reproducing devices of four rotating drums 9. record 7
,・'The playback device 4() is a magnetic tape 1 of the so-called digital audio tape (abbreviation: I) AT) standard.
Recording 7.' Playback is performed. The recording 7/' playback device 49 is
A rotating drum 9 provided with a pair of magnetic helads 9 Ei and 9 L+, a sensor 17 serving as a starting end detection means,
It is configured to include a sensor 16 which is a terminal end detection means, and a control circuit 18 which is a control (λ-means). -1) with a shape wrapped around it,
It is stored in the cassette [・2. Such a cassette 2 is used in this recording/producing device 4 (
), the magnetic tape l
It becomes possible to record the belief in the situation. That is, the guide roller 5.6 and the inclined post 7.8 are
Positions 5 fi each indicated by a dashed line. 6it o and position 'Ml 7 a, 8 ;- to arrow rf41. -12 and in the directions indicated by the arrows ll3, ll4. As a result, the magnetic tape 1 is pulled out from the cassette 2 and wound around the rotary drum 9 at a predetermined angle by the inclined posts 7 and 8. The magnetic tape 1 is wound by the fixed boss 10 on the supply side at a constant angle on the tension boss 11 regardless of fluctuations in the winder.
) Rotating drum! , 9 is kept constant. Further, the magnetic tape 1 is located at a position 13 indicated by a broken line.
The pinch roller 13 moved in the direction of arrow 45 from a
p8! It is pressed against Yabustan 12. This capster 12 is rotationally driven by a motor 14, and during recording and redirection, the magnetic data 11 is moved at a speed of 5.
Drive in the Y46 direction. At this time, rotating drano 1
．． lO is rotated in the 17 directions, and the magnetic tape is rotated in the 17 directions and recorded or reproduced on the magnetic tape. This magnetic tape 1 has a fixed boss 15 on the winding side.
Ka through. It is wound onto a reel mounted on a reel stand 4L+ which is rotationally driven by the motor 1ε turtle of set 2. In addition, in connection with the rewinding operation, the reel stand 3b is equipped with a motor 3t.
t is provided. The tape running drive circuit 1 controls and rotates the motors 3a, 4a, and 14 based on the control signal from the control circuit 18, thereby causing the magnetic tape 1 to run. j speed is controlled. Also, when the stop motion f1' request signal is output from the control circuit 18 to one tape drive circuit, the tape drive circuit 19 controls motors 3, t, 4it,
14 is stopped, and the traveling of the magnetic chip 11 is stopped. The sensor 16 detects the end of the magnetic tape 1 during recording, playback, fast forward and fast forward playback. Also,
The sensor 17 detects the starting end of the magnetic tape 1 during rewinding and rewinding playback. Sensor 16.17
are driven by two sensor drive circuits 30), and their dynamic fE portions are controlled by a control circuit 18). In addition, the detection signals from sensors 16 and 17 are
'4) Output on 18 respectively. Figure 2 is the 17th cutting plane line! It is a sectional view seen from 1-n. Referring to FIG. 2, the operation of the sensor 16 to detect the end of the magnetic tape 1 will be described. Incidentally, the same applies to the detection of the starting end of the magnetic tape 1 by the sensor 17, and only section 16 will be described below. The sensor 1f') is, for example, an electric light diode (LED).
The device includes a light emitting element 20 realized by a phototransistor or the like, and a light receiving element 21 realized by a phototransistor or the like. The light 22 output from the light emitting element 20 enters the inside of the cassette )-2 through a through hole 50 provided in the cassette 2. This light 22 is reflected by Arisno 23 in a direction opposite to the direction of incidence. This reflected light is
)・2 is emitted to the outside of the case foot 2 through the through hole 51 provided therein. The magnetic tear 7'1 is run so as to intersect the optical path of this reflected light. The magnetic tape 1 is coated with a magnetic material and has a light-shielding property,
At both ends of this magnetic tape 1, a leader tape or [
・There is a transparent part called Leratea. The light reflected by the prism 23 is blocked by the magnetic tape 1, passes through the transparent portion, and is detected by the light receiving element 21. In this way, the sensor 10 detects the trailing end of the magnetic tape 1, and similarly, the sensor 17 detects the starting end of the magnetic tape 1. The third Lil is a block diagram showing the electrical configuration of a part of the recording/playback device 4c). The sensors 16 and 17 include the light emitting elements 2O and 2S and the light receiving element 2.
1.27, respectively, and a light receiving element 21.27.
are, for example, phototransistors, and the power supply voltage Vcc is applied to the resistors 24ε and 4L+, respectively. This resistor 24; i is 3 to constitute a sensor drive circuit n29. The collectors of the light receiving elements 21 and 27 are also connected to terminals B and 2 of the control circuit 18, respectively, and the emitters are grounded. The emitter of this transistor 26 is connected to the power supply voltages 2 and 2, and the collector is connected to the resistor 25.
It is connected to the light emitting element 28 via. The aforementioned resistance 2.
4, the transistor 26, and the resistor 25 constitute a drive circuit 30. The output end of the light emitting element 28 is connected to the light emitting element 20, and the output end of the light emitting element 20 is grounded. As a result, when a low level signal is derived from terminal A, light emitting element 28 and light emitting element 20 are activated and emit light. When the light emitted from the light-emitting elements 28 and 20 is blocked by the light-shielding magnetic tape 1, the light-receiving element 27 and the light-emitting element 21 become deaf, and the end':f-
High level signals are derived from B and C, respectively. Further, when the light from the light emitting element 28 or the light emitting element 20 passes through the light-transmitting part connected to the starting end or the ending end of the magnetic tape 1 and is received by the light receiving element 27 or the light emitting element P21, the light receiving element 27 Alternatively, the emitter and collector of the light emitting element 21 are brought into conduction, whereby a low level signal is output to the terminal B or terminal C, respectively. Also record 7. 'The playback device 19 is provided with an input operation section 33 for performing its operations. System (cotton circuit 18 is
Generated by key operation in the input operation unit 33,
Based on the signal provided via the fin 32, the 1tt
The ll fJl signal is outputted to the tape running drive circuit 19 via the line 31, thereby controlling the running speed of the magnetic tape 1, and at the same time, a control signal as described later is derived to the terminal A. Furthermore, detection signals from the sensors 16 and 17 are derived from terminals B and C of the control circuit 18, respectively, and the control circuit 18 controls the line 31 based on these signals.
A stop operation request signal for stopping the running of the magnetic tape 1, etc. is output to the tape running drive circuit 19 via the magnetic tape drive circuit 19. The operation fY input section 33 also includes recording keys 34 . A fast forward key 35, playback=q-36, rewind=V-37, stop key 38, fast forward playback key 39, and rewind playback key 40 are provided. FIG. 11 is a flowchart for explaining the operation fj of the recording/reproducing device 49. The motion f1 will be explained below with reference to the fourth eye. When the recording/playback device 49 is powered on, the process moves from step r11 to step r+2, where initial settings are performed.In other words, a high-level signal is output from terminal A, which causes the transistor 2
6 is in a cut-off state, and the light emitting element TF20.28 is in an extinguished state. In this way, the playback device 4J17'' becomes in a standby state.

[It was determined that there was key human strength at 14,
Move on to Step RX 5. , in step rt3, if no key manual operation is performed, it is determined in step n4 that there is no key manual operation, and step
Return to 13. (1) Stopping operation Step r15 is divided into step r+3! −
It is determined whether the manual operation fI: is an operation of the stop key 38 or not. In other words, stop-! -38 is operated (↑-), the terminal moves to Stella 7 rll 7 and becomes a high level bell, and at step 18, a stop operation request signal is sent to the tape running drive circuit @1. is led out, and the running of the magnetic tape 1 is stopped.At this time, since the terminal A is at a high level, the controller 1617 becomes inactive.After this, the stainless steel arm 3 is returned to Therefore, when the magnetic tape 1 is stopped, a high-level signal as shown in FIG. 5(l) is derived from the terminal. (2) Recording operation f The !-operation in the mouth 3 is recorded i4 ;”i--3
~ 1, the process moves from step ``16'' to step ``nl''. At this time, the Qi 1 running deception circuit t
A recording motion request signal is outputted to 9, and the magnetic tape 1 is run at a running speed of 2. Further, at the step port 2o, the terminal A is set to a low level. At this time, sterig n
In step 21, when either terminal B or terminal C is at a low level, that is, when the start or end of the magnetic tape 1 is detected, the process moves to step r117, and the above-mentioned stop operation is performed. It will be done. If a high-level signal is derived at both terminals B and C in step rI21, the process moves to step r122).
is considered to be at a high level. At the step opening 23, a period T1 is set. In other words, the timer built in the control circuit 8 has a period T.
An initial value corresponding to 1 is set. This Ryo, step r
At step 124, it is determined whether the period T1 has elapsed based on this timer, and when the period T1 has elapsed, the process returns to step r13-) and the above-described operation is repeated. At this time, if no other key operation is performed, the determination at step rI6 is that the record key 34 is pressed, and step nl
”), and the same operation is repeated. As a result, the signal shown in No. 511J (2) is output from the terminal A. (3) In the reproducing operation step [I3, the reproducing, V 36 is pressure manipulation +'
In the Ped store, step ゛[17 to step n2
Move on to 5. 1] in step r125, the control cycle n1
A reproduction operation request signal is outputted from 8 to one tape running drive circuit, and the magnetic tape is read based on this signal. 1 is running at a running speed of ■3. This running speed (3) is usually approximately equal to the running speed v2 at the time of recording. Step 2 (step r+2+') is reached, where the recording operation described above (41J) is performed. J) When, 1
, step n 24 moves to step r + 3, and key operation 11mi is not performed -) In that case, step 7 aro 71r
At f+j, it is determined that the playback key 3-1 has been pressed, and the process moves to step 125. However-), record-kidney-3
-1 and the play key 36 are pressed, the 5th L
A signal with a waveform shown in '11(2) is output to terminal A. <4) Fast forward movement f1 If the fast forward V-35 is pressed in step rI3, the movement moves from the step opening 8 to step r126.
), the control circuit 18 outputs a fast forward operation request signal to the Q1 travel drive circuit 19. As a result, the magnetic tape 1 is forwarded at a fast forward speed J) at a running speed v4. Running 1
The speed ■4 is the traveling speed V2. Greater than v4. Further, in step r128, terminal A is set to low level, and in step r''29, it is determined whether either terminal B or terminal C is at low level. If either terminal B or terminal C is at low level, ■
The process moves to step r117 via step r117, and the above-mentioned stopping action is performed. When the running of the magnetic tape 1 is stopped, the stay
7 n 3, and the above-described operation is repeated. In step 129, if both terminals B and C are at high level, the process moves to step rI30, where terminal A is set to high level.
In the timer built in one circuit 18, an initial value corresponding to the period T3 is set. This period T3 is V2. V
In relation to 3 and 4, T1', and T3 are selected. During this period, the time period T3 is set by this timer at step port 32.
It is determined whether or not the period T3 has elapsed, and as soon as the period T3 has elapsed, the process returns to step rr3 and the above-described movement fY is performed. At this time, the key operation is performed at step 7°n 3, and the key operation is performed at step 7 (right).
35/l is cut off from the pressure point 1 and moved to ζ tear pro 26, where the above-mentioned movement is performed. In this way, No. 13 shown in No. 51 EJ (4) is derived for the terminal person. (5) Rewinding movement 1 ya Also, in the step opening 9, the lip reversing;
Moving on to step 27, the control circuit 18 starts the tape running drive cycle! 31
Then, a rewind operation request signal is outputted, whereby the magnetic tape 1 is rewound at a running speed of 5. Traveling speed ■5 is ■5・V2. It is V3. After this step r
The process moves to I28, the above-mentioned movement is performed, and step n
Return to 3. At this time, if the key is not pressed in step rs3, it is determined that the rewind key 37 is in the depressed state in step rI9, and the process returns to step r+27.In this way, to the terminal, A signal with the waveform shown in FIG. 5 (4) is derived. (6) When three fast-forward playback keys are pressed in fast-forward playback operation f or step rI3, the signal is output from step port 10 to step r+35.
Then, the control circuit 18 outputs a fast-forward reproduction operation request signal to the tape running drive circuit 19, and as a result, the magnetic tape 1 is run at the running speed 6 for fast-forward playback. Thereafter, in step r112, the terminal A is set to low level. This running speed ■6 is V2. V3 2nd V4. It is V5. At this time, terminal B or terminal (
For P4 where any one of the signals is at a low level, the above-mentioned stopping operation is performed in step [117] via step (2). magnetic tape l f) When the running is stopped, step n
Returning to step 3-), the above-described operations are repeated. step r
If both terminals B and C are at high level in step 113, terminal A is set to high level in step 114.After this, in step r115, the timer built in the control circuit 18 is set to high level. In other words, in this timer, an initial value corresponding to period T2 is set. During period T2, the traveling speed ■6 is V2.V3.
<V4. In relation to being V5, TI>T22・T3
＞. In step r116, this timer determines whether the period T2 has elapsed or not, and when the period T2 has elapsed, the process returns to step r3 and the above-described operations are repeated. At this time, if the key is not pressed manually in step n3, it is determined that the fast forward playback key 39 is pressed in step nlO, and step 11
35, and similar operations are repeated. In this way, a signal having the waveform shown in FIG. 5(3) is derived from terminal A. (7) Rewind playback operation If the fast forward playback key 39 is not pressed at step 10, it is determined that the rewind playback key 40 has been pressed, and the process moves to step r111. step nil
Then, the control circuit 18 outputs a rewind playback operation request signal to the tape running drive circuit 19. As a result, the magnetic tape 1 is run at a running speed of 7 in the direction opposite to that during fast-forward playback. This traveling speed (7) is set, for example, approximately equal to the traveling speed (6). After this, the process moves to step n12, and the aforementioned fast-forward playback operation is repeated. At this time, in step n3, two! - When no operation is performed, the rewind playback key
It is determined that there is a pressure of O, and the process moves to step ``111.'' Through such an operation, a signal having the waveform shown in No. 50 (3) is derived from the terminal type. In the embodiment, the terminal A of the control circuit tS
By controlling the signals output from the sensors 16 and 17 as shown in FIG.
The operating state of the magnetic tape 1 is controlled at a cycle corresponding to the running speed of the magnetic tape 1. Therefore, since the sensors 16 and 17 are operated at regular intervals, their power consumption is significantly reduced compared to the case where the sensors described in connection with the prior art are constantly operated. be able to. Moreover, since the magnetic tape 1 is configured to run at a high running speed 41 and the period of the signal output to the terminal A is shortened, the running distance of the magnetic tape 1 during the non-detection period of the sensor 1617 can be increased. Therefore, so-called excessive running of the magnetic tape 1 can be prevented. In particular, when the magnetic tape 1 is stopped,
? ), the end -L as shown in Section 51(1).
A becomes C (level, so -) and sensor 16.1
7 is in a non-moving state, and a significant power reduction effect can be obtained. In this embodiment, the four recording, reproducing, and reproducing devices detect the running state of the magnetic tape 1 by operating the input operation 1: part 33f), and thereby connect the terminal A to the terminal A. If the signal is configured to control the period of the signal derived, the running speed of the magnetic tape 1 is detected, for example, by detecting the number of rotations of the reel, and the signal is thereby derived to the terminal A at -). It can also be configured to control the period of the signal. In the period '1-T3, for example, by giving a predetermined initial value to a timer built in the control circuit 18, and by subtracting the timer i':), the counted value reaches a predetermined value. In the present invention, the period T1 to T
It is also possible to use software or hardware to perform an interrupt operation on the control circuit 18 when the time period 3 has elapsed, and to output a signal having the waveform shown in FIG. 5 during a predetermined operation. DETAILED DESCRIPTION OF THE INVENTION According to the present invention, as described in detail, the power consumption of a recording or reproducing apparatus that detects the beginning and end of a recording medium can be significantly reduced.

[Brief explanation of the drawing]

No. 112I is a plan view showing the configuration of the magnetic drum of the recording device 7...' reproducing device 49, close to 91, according to an embodiment of the present invention;
The figure is a sectional view taken from the section line ■-■ in Figure 1, Figure 3 is a block diagram showing the electrical configuration of the main part of the recording 7/playback device = 19, and No. 4121 is a sectional view taken from the section line ■-■ in Figure 1. Flowchart to explain the operation of the device, ↓9, Figure 5 shows the recording/
FIG. 4 is a waveform diagram showing a signal derived to terminal A of control N circuit 18 of playback device 49. FIG. 1...Magnetic chi 1.16.17...Sensor, 18.
・・Control n circuit, 1) ・・Tape running drive circuit, 2
0,28... Light emitting element, 21.27... Light receiving element,
29.30...Sensor drive circuit, 33...Input operation fl
: Department, 3 = 1...Record key, 35...Fast forward key, 36...Playback key 37...Rewind key, 38...
・3 stop keys...Fast forward playback 2! -140... Rewind play! -1-19...Recording/playback device agent Patent attorney Keiichi Nishikyo

Claims (1)

[Scope of Claims] An apparatus for recording or reproducing while driving a recording medium, comprising: a starting edge detecting means for detecting a starting edge of the recording medium; and a trailing edge detecting means for detecting a trailing edge of the recording medium. , a control means for controlling the operations of the start end detection means and the end end detection means, the control means having a period corresponding to the driving speed of the recording medium,
A recording or reproducing apparatus characterized in that the operation/non-operation of the start end detection means and the end end detection means are intermittently controlled.