JPH0622078B2 - Control circuit of magnetic recording / reproducing apparatus - Google Patents

Description

The present invention relates to a magnetic recording / reproducing apparatus, and more particularly to a control circuit of a video tape recorder (hereinafter referred to as "VTR").

(B) Conventional technology A conventional VTR had a power button. Yotsute VTR
When operating the, it is necessary to first operate the power button to energize the power supply, and then operate each operation button to bring it into an operating state. In addition, the user may forget to turn off the power while the recording state or the reproduction state is canceled.

Then, JP-A-55-38629 (G11B5 / 0
In 0), the power button is removed to solve the above problems,
It is shown that the power is turned on / off at the same time by operating each operation button.

(C) Problems to be Solved by the Invention However, in the VTR disclosed in the above publication, the operation is completed and the power is cut off when the operation stop button for reproduction, recording, etc. is operated once. That is, since the power button is removed, the VTR is
Does not work, the so-called operation standby state no longer exists. The operation standby state is indispensable for outputting a signal from the built-in tuner instead of the reproduction output to the VTR having the built-in tuner, timer reservation, setting the reception channel of the built-in tuner, and selecting a channel. An object of the present invention is to eliminate the power button without eliminating the operation standby state.

(D) Means for Solving the Problems In order to achieve the above object, in the present invention, a first mode in which the power source is not energized and a second mode in which the power source is energized and is in an operation standby state In a magnetic recording / reproducing apparatus having a third mode in which the apparatus is operating, the operation button and, if the detection of the operation of the operation button is during the first mode period, shifts to the second mode, A system control circuit is provided which shifts to the first mode and shifts to the third mode during the second mode period.
Further, an operation command signal generating means is provided, and the output of the operation command signal generating means for shifting from the second mode to the third mode is detected during the first mode period by using a system control circuit. If done, the second
It is characterized in that the mode is shifted to the third mode through the mode.

(E) Operation According to the present invention, the function of the operation button is different depending on the above three modes, and the power supply is energized by the output of the operation command signal generating means.

(F) Example One example in which the present invention is applied to a VTR will be described below with reference to the drawings.

FIG. 1 is a circuit block diagram of the present invention. (1) Stop button, (2) Play button, (3) Fast forward button, (4) Rewind button, (5)
Is a recording button, (6) is an eject button for instructing to take out the cassette, (7) is a recording reservation button, (8) is a tuning button, and (9) is a cassette-in sensor for detecting whether or not a cassette is inserted. Yes, connected to the system control circuit (10). The system control circuit (10) includes a built-in tuner (11), timer microcomputer (12), and cylinder motor.
(13), reel motor (14), capstan motor (15), video and audio circuit (16), power supply circuit (17), loading motor (1
8), loading position detection circuit (19) and cassette claw detection switch (20) are connected. The system control circuit (10) performs interrupt processing by operation command signals generated by various operation buttons and cassette-in sensor (9) shown as (1) to (8), and has a built-in tuner (11) and timer microcomputer ( 12), cylinder motor (13), reel motor (1
4), the capstan motor (15), the video / audio circuit (16), the power supply circuit (17), and the loading motor (18) are controlled. Also, check the states of the cylinder motor (13), the reel motor (14), the capstan motor (15), and the video / audio circuit (16) to make a VTR.
The operating status of the power supply circuit (17) is checked, the state of the power supply circuit (17) is checked, and whether or not the power supply is energized (hereinafter referred to as power ON and OFF) is detected, and the loading position detection circuit (19) is used to detect the cassette. Whether or not the tape is loaded and whether or not the tape is loaded are detected. A separate sensor or the like may be used to detect the presence or absence of the cassette. The loading of the cassette and the loading of the tape are performed by the loading motor (18). Cassette claw detection switch
(20) detects the presence or absence of the erroneous erasure prevention claw on the cassette, and if there is a claw, the system control circuit (10) determines that the cassette is a recordable cassette.

FIG. 2 is a mode change explanatory diagram of the present embodiment, which will be described with reference to FIG. The states A and B are in a mode (first mode) in which the VTR is not powered, the state A is a state in which the cassette (CT) is not attached, and the state B is a state in which the cassette (CT) is attached. Shows the state. In the states C, D, and E, the VTR is energized, the reel motor (14), the capstan motor (15), and the loading motor (18) are stopped, and the operation standby mode (second
In the state C, the guide cylinder (GC) is stopped and the cassette (CT) is not attached. In the state D, the cassette (CT) is attached but the tape is not loaded. , Guide cylinder (G
C) shows a stopped state, and state E shows a state in which the cassette (CT) is mounted, the guide cylinder (GC) is rotating, and the tape is loaded. The states F, G, and H are in a mode (third mode) in which the apparatus is operating, and the state F is a cassette loading / unloading operation state in which the cassette (CT) is inserted into or ejected from the VTR, State G is the tape loading / removing of the tape (TP) from the cassette (CT).
Unloading operation state, state H is the state where the VTR is operating such as recording, reproduction, fast forward, rewind (operation mode)
Indicates. The VTR of this embodiment forms an operation standby state while the tape is loaded, and allows the tape to run at high speed while the tape is loaded.

In the figure, (HD) indicates a cassette holder, which is moved by a loading motor (18) along a key-shaped guide (GD) to load and unload the cassette (CT). The cassette lid (CL) of the cassette (CT) is opened and closed by moving the cassette holder (HD) up and down. (GP) indicates a guide post, which is in the cassette (CT) at the time of cassette loading, and is driven by the loading motor (18) to load and unload the tape (TP). The guide cylinder (GC) is rotated by the cylinder moder (13).

Next, the operation of this embodiment will be described with reference to FIGS. 1 and 2 centering on the flow chart shown in FIGS.

Figure 3 shows the system control circuit (1
It is a flow chart showing the interrupt processing of 0), and shows the point of the present invention.

When the stop button (1) is pressed, first the power circuit (17) is turned on or OF
If F is detected (30), if the power is off, the power circuit (17) is turned on (31). Next, the presence / absence of a cassette is detected (32), and if there is no cassette, the interrupt process ends. (Hereinafter "RE
T will be done. " ) That is, the transition from state A to state C. Also, if there is a cassette in step (32), the tape is loaded (33) and put in stop mode (3
Four). The stop mode is the state E, and VT is set in the operation standby state.
The signal from the built-in tuner (11) is output instead of the reproduction output of R. RET after entering stop mode. That is, it is a transition from state B → state D → state G → state E. As described above, if the detection of the operation of the stop button is during the first mode period, the mode shifts to the second mode.

Further, in step (30), if the power is on, it is detected whether it is the operation mode (35). If it is not the operation mode, the presence / absence of the cassette is detected (36) and whether the tape is loaded (37) is detected. If there is a cassette and the tape is loaded, it is unloaded (38) and the power supply circuit (17) is turned off (39). That is, it is a transition from state E to state G to state D to state B. If there is no cassette, the state is changed from state C to state A. If there is a cassette and it is in the unloading state, the state is changed from the state D to the state B. When the stop button is pressed in state D, the recording reservation button is pressed, as will be described later.
(7) is present when the tuning button (8) is turned off and there is a cassette, and when the state D is entered. As described above, if the detection of the operation of the stop button is during the second mode period, the mode shifts to the first mode. After step (39), the presence / absence of reserved data (40) in the timer microcomputer (12), the presence / absence of a cassette (41), and the presence / absence of a cassette claw (42) are detected. (43), RET. Otherwise, RET as it is. The timer stand-by state means a stand-by state in which recording is being performed according to the reservation data in the timer microcomputer (12). That is, in the present embodiment, a so-called timer standby button for putting the VTR in the timer standby state is unnecessary.

If the operation mode is set in step (35), the stop mode is set (44), and RET is performed. That is, it is a transition from the state H to the state E. As described above, if the detection of the operation of the stop button is in the third mode period, the mode shifts to the second mode.

Fig. 4 shows the system control circuit (1
It is a flowchart showing the interrupt processing of 1).

When the play button (2) is pressed, the presence / absence of a cassette is detected first.
(50) If there is no cassette, do RET without doing anything. That is, in the states A and C, the play button (2) is not accepted. When there is a cassette, it is detected whether the power supply circuit (17) is ON or OFF (51), and when it is OFF, the power supply circuit (17) is turned ON (5
2). Next, it is detected whether or not the tape is loaded (53), and if not loaded, it is loaded (54). That is, states B, D, E
In any case, the state H is entered. Yotsute step (5
4) The following is a check in the operation mode, that is, the third mode. Next, it is detected whether or not it is the reproduction operation mode (55), and if it is the reproduction operation mode, RET is performed. That is, nothing is done even if the play button is pressed during the reproduction operation mode. On the other hand, if it is not the reproduction operation mode, it is detected whether or not it is the recording operation mode (56).
ET. That is, nothing is done even if the play button is pressed in the recording operation mode. If it is not the recording mode, the reproduction operation mode is set (57) and RET is performed.

It should be noted that finally setting the reproduction operation mode means not only the case of shifting from the state E to the state E but also the fast-forward button (3) and the rewind button (4).
As will be described in detail in the explanation of the interrupt processing by, there may be a case where only the operation mode changes while the state H remains. According to the flow chart described above, in the state B, the play button (2)
When the above operation is detected, the state is changed to the state B → the state D → the state G → the state H, and the reproduction operation mode is set. That is, it is a transition from the first mode to the third mode.

Figure 5 shows the system control circuit with the fast-forward button (3).
It is a flow chart showing the interrupt processing of (10).

When the fast-forward button (3) is pressed, the presence / absence of a cassette is first detected (60), and if there is no cassette, nothing is done and RET is performed.
That is, in states A and C, the fast-forward button (3) is not accepted. If there is a cassette, it is detected whether the power supply circuit (17) is on or off (61), and if it is off, the power supply circuit (17) is turned on (62). Next, it is detected whether the tape is loaded (63), and if not loaded (64). That is, states B, D,
In any case of E, the state H is entered. Therefore, the step (64) and the following steps are the operation mode, that is, the third mode check. Next, it is detected whether it is the fast-forward operation mode (65) or the recording operation mode (66), and if it is the fast-forward operation mode or the recording operation mode, RET is performed. That is, the fast forward button (3) is not accepted. Next, it is detected whether or not it is the fast-forward playback mode (67), and if it is the fast-forward playback mode, the playback operation mode is set (68). The fast-forward reproduction mode is an operation mode in which the reel motor (14) and the capstan motor (15) are rotated at a speed faster than that in the normal reproduction so that the tape is reproduced while being fast-forwarded.
In step (67), it is detected whether it is the reproduction operation mode (69) or not the rewind reproduction operation mode (70) if it is not the fast-forward reproduction mode. If it is the reproduction operation mode or the rewind reproduction operation mode, the fast-forward reproduction is performed. The operation mode is set (71) and RET is performed. If not, the fast-forward operation mode is set (72) and RET is performed. What is the rewind playback operation mode?
This is an operation mode in which the reel motor (14) and the capstan motor (15) are rotated in the opposite direction to the normal reproduction and at a speed faster than that of the normal reproduction, thereby reproducing the tape while rewinding it quickly. Note that steps (67) (6
As is clear from 8) and steps (69) and (71), every time the fast-forward button (3) is pressed, the mode change is repeated from the playback operation mode to the fast-forward playback mode and from the fast-forward playback mode to the playback operation mode. According to the flow chart described above, when the operation of the fast-forward button (3) is detected in the state B, the state is changed to B-state D-state G-state H, and the fast-forward operation mode is set. That is, it is a transition from the first mode to the third mode.

Figure 6 shows the system control circuit for the rewind button (4).
It is a flow chart showing the interrupt processing of (10).

The basic operation is the same as that of FIG. 5, and the difference from FIG. 5 is the step (80) rewind operation mode, step (81) rewind reproduction operation mode, step (82).
Whether or not it is the fast-forward reproduction operation mode, step (83) rewind reproduction operation mode, step (84) rewind operation mode, and step (6) in FIG. 5 respectively.
5), step (67), step (70), step (71), and step (72). The detailed explanation is omitted.

FIG. 7 shows the system control circuit (1
It is a flowchart showing the interrupt processing of 0).

When the recording button (5) is pressed, the power circuit (17) is turned on or off
(90), presence or absence of cassette (91), whether or not tape is loaded (92), whether or not operation mode (93), presence or absence of cassette claw (94) are detected, and all conditions are met. Only when the recording operation mode (95),
In other cases, do RET without doing anything. That is, the operation of the record button (5) is accepted only in the state E and when the recordable cassette is inserted.

FIG. 8 is a flow chart showing the interrupt processing of the system control circuit (10) by the eject button (6).

When the eject button (6) is pressed, the presence / absence of a cassette is first detected (100), and if there is no cassette, nothing is done and RE
T. That is, in states A and C, the eject button (6) is not accepted. If there is a cassette, the power circuit (17) is ON or O
If FF is detected (101), and if it is OFF, the power supply circuit
(17) is turned on (102), the cassette is unloaded, that is, ejected (103), and the power supply circuit (17) is turned off.
F (104) and RET. That is, there is a transition to state B → state D → state F → state C → state A. If it is ON in step (101), it is detected whether or not it is the operation mode (105), and if it is not the operation mode, the tape is unloaded as necessary (106) (107),
After that, the cassette is unloaded (108) and RE
T. That is, there is a transition to state E → state G → state F → state C, or a transition to state D → state F → state C. If it is the operation mode in step (105), it is detected whether or not the recording operation mode is set (109). If it is the recording operation mode, RET is performed without doing anything. That is, the eject button (6) is not accepted during the recording operation mode. If it is not the recording mode, it is set to the stop mode (110), the tape is unloaded (107), and the cassette is unloaded (1).
08), RET. That is, state H → state E → state G
→ Transition to state F → state C.

FIG. 9 is a flow chart showing the interrupt processing of the system control circuit (10) by the recording reservation button (7).

When the recording reservation button (7) is pressed, it is first detected whether the power supply circuit (17) is ON or OFF (120), and if it is OFF, the power supply circuit (17) is turned ON (121). Then, a recording reservation operation is performed (122). It should be noted that the illustration of the operation buttons and the details of the operation procedure used for the recording reservation operation, that is, the setting of the start time and the end time are omitted. After the recording reservation operation is completed,
Presence or absence of cassette (123), Presence or absence of cassette claw (12
4) It is detected whether the operation mode is set or not (125), and if there is no cassette or cassette tab, or if it is the operation mode, RET is performed. Therefore, if the recording reservation button (7) is pressed in the state B and there is no claw on the cassette, the state D is still maintained. This is to prevent unnecessary tape loading. Steps (123), (124),
If the three conditions of (125) are satisfied, they are unloaded as necessary (126) (127), and the power supply circuit (17)
Is turned off (128) to enter the timer standby state (12
9) RET.

Figure 10 shows the system control circuit by the tuning button (8).
It is a flow chart showing the interrupt processing of (10).

The tuning button (8) is for selecting the reception channel of the built-in tuner (11). When the tuning button (8) is pressed, it is first detected whether the power supply circuit (17) is ON or OFF (130),
If it is OFF, the power supply circuit (17) is turned ON (131), and then the built-in tuner (11) is tuned to (132) RET. Therefore, if the tuning button (8) is pressed in the state B, the state is shifted to the state D, and unnecessary tape loading is not performed.

FIG. 11 is a flow chart showing the interrupt processing of the system control circuit (10) by the cassette-in sensor (9).

The cassette-in sensor (9) is installed in the cassette insertion opening (not shown) of the VTR and detects insertion of the cassette. When the cassette in sensor (9) detects the insertion of the cassette, it first detects whether or not the cassette is already in the VTR (140), and if there is a cassette, does nothing and R
ET. If there is already a cassette, the cassette insertion may be mechanically blocked. If there is no cassette, turn on the power supply circuit (17) as needed (141) (1
42), cassette loading (143) and tape loading (144). Next, the presence / absence of a cassette claw is detected (145), and if there is a claw, the stop mode is set (146) and RET is performed. If there is no fingernail, the reproduction operation mode is set (147) and RET is performed. Therefore, when a cassette without a claw is inserted in the state A, the state is changed to state A → state C → state F → state G → state H. That is, it is a transition from the first mode to the third mode.

In the embodiment of the present invention described above, there is no power button, and the power button (17) is turned on and off by operating the stop button (1).
F is performed. In addition, the conditions that allow the transition from the second mode to the third mode by the play button (2), the fast forward button (3), the rewind button (4), and the cassette in sensor (9). If it is, even in the first mode, the mode shifts to the third mode.

(G) According to the present invention, the power button can be dispensed with, even though the power is turned on and the second mode is in the operation standby state, and only the power ON operation is required. The number of operations to be performed can be minimized and the effect is great.

[Brief description of drawings]

Each of the drawings shows an embodiment of the present invention, FIG. 1 is a circuit block diagram, FIG. 2 is a mode change explanatory diagram, and FIGS. 3 to 11 are operation buttons or interrupts of a system control circuit by a sensor. Reveal the flow chart showing the treatment. (1) …… Stop button, (2) …… Play button, (3) …… Fast-forward button, (4)
…… Rewind button, (9) …… Cassette in sensor, (10)…
… System control circuit, (17) …… Power supply circuit.

Claims (2)

[Claims] 1. A first mode in which the power supply is not energized,
In a magnetic recording / reproducing apparatus having a second mode in which the power is energized and is in an operation standby state, and a third mode in which the apparatus is operating, an operation button and detection of the operation of the operation button are the first mode. During the mode period, the second mode is entered, while during the second mode period, the first mode is entered, and the third mode is set.
And a system control circuit that shifts to the second mode during the mode period (1). 2. A control circuit for a magnetic recording / reproducing apparatus according to claim 1, further comprising an operation command signal generating means, and a system control circuit is used to switch from the second mode to the third mode. When the output of the operation command signal generating means for instructing the shift is detected during the first mode period, the shift is made to the third mode via the second mode. A control circuit of the magnetic recording and reproducing apparatus described.