JPS6044870B2 - video disc player - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a video disc player, and particularly to a video disc player that can be provided with slow motion playback means to expand its uses.

In recent years, video signal information has been recorded on a rotating intermediate recording medium (hereinafter referred to as a disk), this disk is placed on a turntable and rotated, and a pick-up needle is placed on the top of the disk. Video disc players that play video signals by sliding contact have been developed.

In order to further diversify the uses of this video disc player, there is a demand for a player that can reproduce images in slow motion. The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a video disc player that allows slow motion playback with simple means.

An embodiment of the present invention will be described in detail below with reference to FIGS. 1 and 2.

That is, in FIG. 1, 11 is a main video disk, and a spiral recording line is set on the rotating surface of this main video disk, and the recording line can be traced by a signal pickup needle 12. The needle 12 is provided on an arm device 13, and can be brought into sliding contact with the upper surface of the disk or moved away from it by means of a lift control means of the arm device 13. The information of the video signal detected by the pick-up needle 12 is transmitted to the movable contact C1 of the switch device 14 and the switch device 1.
5 and the vertical synchronization signal detection circuit 16, respectively. Said switch device 15 also has a first fixed contact A2, and the signal obtained at the movable contact C2 is applied to the television signal processing circuit 17. The synchronization signal obtained by the vertical synchronization signal detection circuit 16 is also applied to a control pulse generation circuit 18. This control pulse generation circuit 18 applies a control pulse to the needle shift drive circuit 19 at a predetermined time. This needle shift drive circuit 19 drives and controls the position of the needle 12 of the arm device 13 using the control pulse, and the needle is shifted to a line one line back from the current trace line. Further, the control pulse generation circuit 18
, the output of the slow motion designation device 20 is applied to control the operation or non-operation of the control circuit. Further, the output control pulse of the control pulse generation circuit 18 is also applied to the track selection control circuit 21.

This track selection control circuit 21 controls switch devices 22, 23 and first and second head control devices 24, 25 using various control pulses. The head control devices 24 and 25 respectively control the magnetic disk 2 for recording and reproducing.
A magnetic head device 27, 2 that performs recording, reproduction, and erasing on 6.
8 signal paths are formed, the timing of which will be described later. The recording/reproducing magnetic disk 26 is rotated in synchronization with the main video disk 11. Furthermore, the track selection control circuit 21 also controls the switch devices 22 and 23 with its output control signal, so that the signal path passing through these switch devices 22 and 23 can be switched.

In other words, the switch device 22 can apply the output applied to the first and second fixed contacts A3 and b3 to the head control device 24 or 25, and the movable contact C3
, the output of the first fixed contact a1 of the switch device 14 is introduced. Further, the switch device 23 can introduce the outputs of the head control devices 24 and 25 to the first and second fixed contacts A4 and b4, and the output that is applied to the movable contact C is the output of the head control devices 24 and 25. First fixed contact? will be introduced in Next, the operation of the above player will be explained. First, {1) the magnetic disk 26 rotates synchronously with the main video disk 11, the number of rotations is N times the number of rotations of the main video disk, and at least a recording/reproducing track corresponding to the magnetic heads 27 and 28 is provided. It has two. (N is the number of frames included in one rotation of the main video disk) {2) Next, the needle 12 that traces the main video disk 11 is moved by one groove to the outer groove of the disk at an appropriate timing to be described later. This is done, for example, by controlling the position of a lever holding the needle 12 at its tip by a coil magnetic field generated by a current generated by a charging/discharging circuit. (3) Furthermore, the control pulse generation circuit 18, track selection control circuit 21, head control devices 24, 25, switch devices 22, 23, etc., output one frame of image information signal obtained by the normal reproduction method of the main video disk. A circuit connection for sequentially recording or reproducing information on the recording/reproducing track of the recording/reproducing magnetic disk 26 at an appropriate timing, a means for introducing a reference signal into the control pulse generating circuit 18, and a means for transmitting the final output signal to the television. It constitutes a means for introducing the digital signal into the signal processing circuit 17. First, if normal operation, that is, slow motion playback is not performed, switch devices 14, 1
5 are switched to the fixed contacts Bl and b2, respectively, and the signal picked up by the needle 12 is directly introduced into the television signal processing circuit 17.

Next, when the slow motion designation device 20 is operated, the switch devices 14 and 15 are switched to the fixed contacts Al and a2, respectively, and the control pulse generation circuit 18 is activated by the vertical synchronization signal from the vertical synchronization signal detection circuit 16. It will create and output control pulses.

An explanation will now be given with reference to FIG. 2 assuming that the main video disk 11 records four frames per revolution.
First, each frame signal for one rotation of the main video disk is named 1, 2, 3, 4 in order, and if we consider the case where these are obtained by slow motion playback of 115, then 1, 2, 3, 4 of the normal signal time. 1, 1, 1, 1, 1, 2, 2, 2,
Each frame can be recreated five times, such as 2, 2, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4.
For this purpose, a magnetic disk 26 for recording, reproducing, and erasing is provided. This magnetic disk 26 has two recording tracks, and the signal for one frame obtained from the main video disk 11 is magnetically recorded one frame at a time. head 27
, 28 are sequentially and alternately recorded and repeatedly reproduced. Here, the magnetic disk 26 rotates at a speed four times the rotation of the main video disk 11 (a number equal to the number of frames included in one rotation), and rotates in synchronization with the rotation of the main video disk 11. Therefore, one frame can be recorded and reproduced by one rotation of the magnetic disk 26. In other words, the main video disk 1
1, when one frame is reproduced, the signal for this one frame is transmitted to the switch device 22 via the switch device 14.
will be introduced in Here, if the switch device 22 is switched to the fixed contact A3 side, the head control device 2
4, one frame worth of signals is recorded in one rotation of the track corresponding to the magnetic head 27. When the magnetic head 27 finishes recording one frame's worth of signals, it is switched to obtain a reproducing operation, and its output is led out to the fixed contact A4 of the switch device 23 via the head control device 24. Therefore, in the switch device 23, the movable contact C4 is switched to the fixed contact A4 side, and the reproduction output is applied to the television signal processing circuit 27 via the switch device 15. In this way, the magnetic disk 2
When the playback rotation of 6 has been performed five times, the recording and playback of the signal of the next frame recorded on the main video disk 11 is performed on the other track. In other words, the control pulse generation circuit 18 generates a timing pulse as shown in FIG. , is introduced into the switch device 14 at the time of the frame component as shown in FIG.

Now, the status of each switch device 22, 23 is fixed contact A3,
a4 side, and if frame component 1 has been reproduced as shown in FIG.
, b4 side. At the same time, the head control device 25 is controlled so that it can be recorded using the signal obtained from the switch device 22 and is also output to the switch device 23, and when the time for one frame has passed, the rest is controlled. The reproduced signal is sent to switch device 2.
3. The pulses (shown in FIG. 2d) which control the head controller 25 in this manner are obtained from the track selection control circuit 21, and the pulse intervals are set by the control pulse generation circuit 18. The output pulse from the track selection control circuit 21 can, for example, control the switching means Tl, T2 as shown in the drawings in each head control device 24, 25 and simultaneously switch the magnetic head function. To explain the switching means T1,
The output of the fixed contact A3 of the switch device 22 is the output of the movable contact A3.
Added to one side. This movable contact A1 can be selected from a fixed contact to A3, and the fixed contact is the fixed contact A of the switch device 23 and the magnetic head 2.
It is connected to each terminal Bl, B2 on the input/output terminal side of 7. When the movable contact A1 is switched to the fixed contact side, the head control device 24 controls the magnetic head 27 to enter the recording state, and the movable contact A1 is switched to the fixed contact side. When the head control device 2
4 controls the magnetic head 27 to be in the reproducing state. Then, when a total of five frames worth of playback output is output, the track selection control circuit 21 is activated and the head control device 2
Control the switching means T2 of No. 5 in the same manner as the previous switching means T1,
In addition, the switch devices 22 and 23 are connected to the second fixed contacts B3 and b.
Switch to side 4. Therefore, finally the switch device 23
The time sequence of frame components applied to the switch device 15 from then on is as shown in FIG. 2f, and becomes a slow motion signal. When slow motion playback is performed as described above, and the same frame information is recorded and played back alternately on the first track and second track five times as shown in B and c in FIG. , 3, 4 frame time signal is 5
It will be necessary to repeat it. In other words, the needle needs to be traced over one revolution of the same track on the disk 11 five times. After repeating 5 times, the next 5, 6, 7, 8
Do the same for frames.

Therefore, it becomes necessary to control the needle position with pulses as shown in FIG. 2e, and this is done by the needle shift drive circuit 19.
It is. In the above embodiment, the 115 slow motion was explained, but various slow motion signals can be generated by changing the timing output pulse applied from the control pulse generation circuit 18 to the track selection circuit 21 or the switching means in the head control device. can be made.

That is, when frame information is repeatedly detected multiple times on the main video disk 11, the frame information obtained in the first detection (frame signals 1 to 1 in FIG. 2)
4), the first control pulse (first pulse in Figure 2 d) at the start of the first frame information (frame signal 1)
A second control pulse ( By obtaining the second pulse in FIG. 2(d) and repeating this, slow motion can be obtained. As described above, the present invention can provide a video disc player that allows slow motion playback with simple means.

[Brief explanation of the drawing]

FIG. 1 is a configuration explanatory diagram showing one embodiment of the present invention, and FIG. 2 is an explanatory diagram of frames and signals shown to explain the operation of the player in FIG. 1. 11... Main video disk, 12... Hand, 13
... Arm device, 14, 15, 22, 23... Switch device, 16... Vertical synchronization signal detection circuit, 17...
- Television signal processing circuit, 18... Control pulse generation circuit, 19... Needle shift drive circuit, 21... Track selection control circuit, 24, 25... Head control device,
26... Magnetic disk, 27, 28... Magnetic head.

Claims (1)

[Claims] 1 A spiral video information recording line is installed coaxially,
A first disk on which N frames (N is an integer of 2 or more) of video signals as continuous frame information are recorded per rotation, and a plurality of a second disk on which (at least two) tracks are coaxially set and capable of recording and reproducing;
It has a plurality of heads arranged to correspond to each track of the second disk for recording, reproducing, and erasing, and a signal pickup means for detecting the signal recorded on the first disk. a pickup arm device, a vertical synchronization signal detection circuit to which a signal from the signal pickup means is applied and separates a vertical synchronization signal from the signal; and a vertical synchronization signal detecting circuit for controlling the position of the pickup means using the vertical synchronization signal; a shift drive circuit that repeatedly controls the pickup means to return to its original state in a predetermined ground color so as to repeatedly detect information of a plurality of consecutive arbitrary frames from the recording line of the first disk; , the vertical synchronization signal from the vertical synchronization signal detection circuit is added, and the first A pulse generating circuit that generates at least a second control pulse in response to the start of second frame information among the frame information obtained by the subsequent rotation detection following the first time. The first head of the plurality of heads controls the first frame information of the continuous frame information detected by the pickup means under the control of a first control pulse from the pulse generating circuit. a first means for recording information on the first track of the second disk and erasing the recorded information after repeatedly reproducing the information a plurality of times; and a second control pulse from the pulse generating circuit; The second frame information following the first frame information is sent to the second frame by the second head.
a head control device having at least a second means for recording on a second track of a disk and erasing the recorded information after repeatedly reproducing the recorded information a plurality of times; A video disc player comprising: switching means for sequentially selecting and outputting reproduction information from the means.