JPH053066B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a disc playback device in which information is recorded on both the front and back sides.

(b) Prior Art To play the front and back sides of a record or disk on which information such as audio signals and video signals are recorded, after playing one side of the record, the record is removed from the player, turned over, and placed back into the player. Generally, a device is constructed so that one side is set and the other side is played, but when playing both sides continuously, the operability is extremely poor.

Therefore, Special Publication No. 62-4762 (G11B 3/08
As shown in 5), a roughly U-shaped guide means is provided to move the linear tracking arm from one side to the other side, and after one side of the record is played back by the linear tracking arm, the record is rotated. A technique has been proposed in which the motor is reversed and the linear tracking arm is moved to the other side using a guide means to perform regeneration.

When playing back both sides of a record continuously with a record player such as the one described above, the playback screen cannot be obtained during the period when the linear tracking arm is moving from one side to the other, and during this time the user cannot The drawback was that it was impossible to determine whether the linear tracking arm was moving or whether an abnormal condition had occurred and playback was impossible. Therefore, while the linear tracking arm is transitioning from one surface to the other, if this transition state is displayed immediately, such as the transition from surface A to surface B or surface B to surface A, the risk of causing confusion as described above would be avoided. do not have.

(C) Problems to be Solved by the Invention However, in a disk where information is recorded on both sides, the signal recording surface and the label displaying the contents are usually not on the same surface. That is, labels regarding information on side A are provided on side B, and labels regarding information on side B are provided on side A. Therefore, the label related to side A should face upward (substantially side A is the bottom side, side B
(with the side facing up) Store it in the disk tray A →
When playing back B (pattern a), and conversely when playing back from A to B by placing the disc in the disc tray with the label for side B facing upward (pattern b)
In this case, the moving direction of the linear tracking arm becomes the opposite direction. When such a display is displayed, if the user mistakenly performs pattern b while intending to perform pattern a, linear tracking may occur even though playback from A to B has actually been performed. The movement of the arm is displayed in a direction opposite to that expected by the user, and the reproduction of B→A is erroneously recognized.

(d) Means for Solving the Problems The present invention provides a solution to the problem even when the pick-up is moved from the surface on which the disc is held by the turntable to the other surface, or from the other surface to the surface on which the disc is held. The present invention is characterized in that, regardless of the true direction of movement, when the pickup moves from surface to surface, movement in a predetermined direction is always displayed.

(E) Effect Since the present invention is configured as described above, even if the direction of the disc holding surface of the turntable is reversed from the normal direction, when the pick-up moves from side A to side B, the movement display is displayed. This is the same as normal, and the user can recognize that the pickup has moved normally from A to B.

(F) Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIGS. 2 to 4 are diagrams showing the pickup and transfer mechanism of the optical video disc player of the present invention. After the disk 9 is set on the disk tray 50 and the disk tray 50 is housed in the player as shown in FIG. 10, the disk 9 is clamped onto the turntable 1 and rotated together.

Normally, the disk 9 is set on the disk tray 50 so that the label that provides information on side A is on the top side, but in this case, the A side of the disk 9 is essentially on the bottom side, that is, the turntable is held. The B side will be on the top side. The reason is that the A side (front side) and B side (back side) of the disk 9 usually have
Information such as audio signals and video signals is optically recorded from the inner circumference to the outer circumference, and the label that guides the information on side A is on the back side B, and the label that guides the information on side B is recorded optically. This is because it is attached to side A.

Reference numeral 6 denotes a support base that supports the pick-up 4 and the feed motor 5, and pinions 7a and 7b, which are driven by the feed motor 5 via a drive force transmission mechanism (not shown), are arranged on both sides coaxially with the pinions. guide rollers 8a, 8b, and guide rollers 10a, 10b supported at the same height as the guide rollers 8a, 8b. A guide hole 12 is formed into which linear guide poles 11a and 11b arranged to extend in the direction can be fitted.

Reference numerals 17 and 18 denote a pair of support blocks that guide the movement of the support base 6, and include lower linear portions 17c and 18c extending above the disk 9, and lower linear portions 17c and 18c extending downward. 18c, and connecting portions 17b, 18b that connect both linear portions 17a, 18a, 17c, 18c, and racks 19, 20 and guide grooves 21, 22 are formed on opposing inner peripheral surfaces. Rack pinions 7a and 7b 1
9, 20 and guide rollers 8a, 8.
b, 10a, 10b are loosely fitted into the guide grooves 21, 22, respectively, the support base 6 moves on the support blocks 17, 18, and the lower straight portion 17
While moving the guide poles 11b and 18c, the guide poles 11b are fitted into the guide holes 12 and guided linearly, making it possible to scan the lower surface of the disk 9 and moving the upper linear portion 17.
While moving the guide poles 11a and 18a, the guide pole 11a is fitted into the guide hole 12 and guided in a straight line, making it possible to scan the upper surface, and by moving the connecting parts 17b and 18b, continuous scanning of the lower and upper surfaces is possible. becomes.

The disk 9 will be explained with reference to FIG. 5. On the inner circumference of the disk 9, a lead-in signal indicating the start of recording information is recorded on predetermined lines 17H and 18H during the vertical blanking period, and the number of tracks is recorded.
The lead-in section 20a has 900 tracks, and the lead-out section 2 has 600 tracks on the outermost track, in which a lead-out signal indicating that information recording has been completed is recorded.
0c is formed, and video and audio signals are recorded in the program section between the two. Furthermore, a label 20d is attached to the inner periphery of the lead-in section 20a to provide guidance on the information recorded in the program section on the back side, as described above. As shown in FIG. 5, when the support base 5 is at the position A of the upper linear parts 17a, 18a or the position D of the lower linear parts 17c, 18c, the pick-up 4 is located at the lead-in part on the lower or upper surface of the disk. Similarly, the upper and lower linear parts 17a, 18a,
When the pickup 4 is at the outermost circumferential positions B and C of 17c and 18c, the pickup 4 scans the lead-out portion on the lower surface or the upper surface, and it is detected that the reproduction of each surface has been completed.

Next, the movement control and movement display of the pickup 4, ie, the support base 6, of this embodiment will be explained.

The double-sided access command means 30 is a means for issuing a double-sided access command in order to shift to reproduction of a desired chapter on the upper surface by operating an operation button during playback of the lower surface of the disk, for example. For example, the JET TURN command means 32 issues a double-sided program command to cause reproduction of a predetermined chapter on the upper surface after reproducing a predetermined chapter on the lower surface in a program that has been set. When the lead-out detection circuit 39 detects a lead-out signal on the lower side in a state where the so-called double-sided continuous playback mode is specified, in which both sides of the disc 9 are automatically played back.
It is a means of issuing a TURN command. In addition to the double-sided reproduction mode, there is also a single-sided reproduction mode in which only one side of the disc is reproduced, and in this single-sided reproduction mode, when a lead-out signal is detected, the pickup returns to the innermost circumference of the bottom surface.

The commands from each command means are once sent to the main control circuit 4.
8, and a control signal is supplied to a spindle motor control circuit 33, a feed motor control circuit 34, and a display/mute control circuit 35 according to each mode.

Based on commands from the command means 30, 31, and 32, the spindle motor control circuit 33 controls the spindle motor 3 when the support base 6 is located on the lower linear portions 17c, 18c side and the lower surface is to be regenerated as described later.
The rotation of the spindle motor 3 is controlled so as to rotate in the normal direction, and to rotate in the reverse direction when regenerating the upper surface on the upper linear portions 17a and 18a side.

The feed motor control circuit 34 causes the feed motor 5 to rotate at high speed, rotate at low speed, and stop, as described later, based on each command from the command means.

For example, when continuous reproduction of both sides is started by operating the duplex reproduction mode button, the support base 6 is positioned at the tips of the lower linear parts 17c and 18c, that is, at the innermost circumference of the lower surface of the disk 9, and Turn on the lead-in switch 41, the spindle motor 3 will be rotated normally at 1800 rpm, and the pick-up 4 will be turned on.
As soon as scanning of the lead-in portion is started, the feed motor 5 is rotated at a low speed. When reproducing the lead-in section, the pickup 4 reads out the lead-in signal via the demodulation circuit 100, and when the lead-in detection circuit 36 detects this lead-in signal, the rotation speed of the spindle motor 33 is set by the program section 20b. The pick-up control circuit 37 starts a pick-up pickup jump (for example, 5x speed) when the value that enables the reproduction of the information has been reached, and this operation is repeated until the spindle motor 3 exits the lead-in section, and the rotation speed of the spindle motor 3 changes to the value that allows information reproduction. The lead-in portion is quickly exited while being held at a possible value. When the lead-in section escapes, the lead-in signal is no longer detected, and instead the chapter number 18H and program time 17 are detected.
It is determined by extracting code data such as H, 18H, etc. Note that the upper and lower linear portions 17a,
Upper and lower lead-in switches 40 and 41 are disposed at the tips of 18a, 17c, and 18c, and are turned on when the support base 6 reaches a position where the pick-up 4 can scan the lead-in portion as described above, and the spindle motor is turned on. 3 and the rotation of the feed motor 5 is controlled. After the lead-in section 20a escapes, the program section on the bottom side is reproduced, and the demodulation circuit 51 demodulates the desired video signal to the CRT 45.
is displayed, the readout section is scanned, and when the readout signal is read out, the feed motor 5 shifts to high speed rotation, and the support base 6 moves to the connecting section 17b,
18b, move from the lower linear parts 17c, 18c to the upper linear parts 17a, 18a (this lower side→
The upper transition is referred to as an upward jet turn),
When the upper lead-in switch 40 is turned on, the feed motor reverses and shifts to a lower speed rotation.
The top surface is regenerated. Incidentally, during this upward jet turn, the spindle motor 3 rotates in reverse at 1800 rpm.

When reproducing the upper surface, the spindle motor 3 reaches a predetermined rotational speed (reproducible) when reproducing the lead-in section, and after the lead-in section has exited, the program section has finished reproducing and the lead-out signal has been read out, and the support base 6 is from the upper straight part 17a, 18a to the lower straight part 1 via the connecting parts 17b, 18b.
7c and 18c, and reaches the innermost circumferential position on the lower surface, and this position is set as a standby position and stopped, completing continuous reproduction of both sides.

The above operation corresponds only when the top surface is B side and the bottom surface is A side, and in the opposite case, that is, when the top surface is A side.
If the side and bottom side are side B, the pickup 4 is brought to the innermost circumference of the top side at the same time as side information (to be described later) is detected, and playback is started from the top side.

During double-sided continuous playback, the display/mute control circuit 35 simultaneously detects the lead-out signal on the bottom side.
A display command is issued to the CRT display circuit 42 and the LED display circuit 43 to display a jet turn from the upper side to the lower side, that is, a downward jet turn. Although the support base 6 is moving from the bottom to the top, the downward jet turn is displayed because, as mentioned above, the labels on each side provide information on the opposite side. However, usually
Since the user understands that the label is intended to guide the user, the user's awareness is prioritized to avoid confusion, and the moving display is intentionally set in the opposite direction of the pick-up's true moving direction. I'm going to The process moves to the upper linear portions 17a and 18a and is stopped when the lead-in signal on the upper surface is read out. Similarly, when the support base 6 moves from the upper linear portions 17a, 18a to the lower linear portions 17c, 18c, the jet turn from the lower side to the upper side, that is, upward direction, is simultaneously detected when the lead-out signal on the upper surface is detected. A display command is issued.

In other than double-sided continuous playback mode, that is, the double-sided access command means 30 commands to suddenly shift to playback of a desired chapter on the top side (not limited to the first chapter immediately after the lead-in section, but the nth chapter) during bottom side playback. is issued, the display will appear at the same time as this command.
The mute control circuit 35 issues a downward jet turn display command to the CRT display circuit 42 and the LED display circuit 43. The same applies when a predetermined chapter on the bottom side is commanded during playback on the top side.

As programmed in advance by the double-sided program command means 31, when the lower side chapter na is regenerated and then the upper side chapter nb is played back, the CRT display circuit 42 and the LED display circuit 43 are displayed in the downward direction at the same time as the lower side chapter na is regenerated. Issues a command to display the jet turn. Similarly, when transitioning to regeneration of the lower chapter na' after regeneration of the upper chapter nb, an upward jet turn display command is similarly issued. When shifting to playback on the opposite side in each mode, be sure to scan the lead-in section on the opposite side once, until the lead-in signal is detected and the spindle motor reaches the reproducible rotation speed, and then start the desired chapter. (With CLV disks, the rotation speed of the spindle motor must be changed depending on the radial position, so the rotation speed must be changed once.
It is necessary to synchronize the motor at the innermost lead-in part, which is set at 1800 rpm. ) Therefore, all of the above-mentioned jet turn display commands are continued until the lead-in section exits.

The explanations for each mode such as double-sided continuous playback above are based on the explanation that disk 9 is the disk tray 5.
This corresponds to the case where the label indicating side A is on the top side of 0, that is, side A is on the bottom side and side B is on the top side (when installed normally), and when the pick-up is moving from side A to side B. In this case, a command to display a downward jet turn is issued, and a display command to display an upward jet turn is issued while the pickup is moving from the B side to the A side. By the way, the reproduced video signal demodulated by the demodulation circuit 100 is input to the code separation circuit 101, and the code separation circuit 101 records the side of the disk as a digital value on a predetermined line of the vertical blanking period in the reproduced video signal. Information and code data such as lead-in signals and lead-out signals are extracted. This side information is information indicating whether the playback side currently being played back in the pickup is side A or side B of the disc, and is input to the display/mute control circuit 35. In addition, in any mode such as double-sided access, double-sided program, and double-sided continuous playback, in the initial state, the pick-up 4 scans the surface held by the turntable 1, that is, the bottom surface of the disk from the lead-in section, and when the side information is obtained. It is determined whether the lower surface is the A or B surface.

Therefore, the above display command is issued when the side information determines that the disk is normally mounted, but the side information indicates that the disk 9 is placed on the disk tray 50 with the label indicating side B on the top side, that is, side A is on the top side. , if the B side is the bottom side (when installed in reverse), after determining the side information, it immediately shifts to the top side and starts playing from the top side, and after playing the top side, shifts to the bottom side and starts playing the bottom side. Do it. At this time, while the pick-up is moving from side A to side B, the label is displayed in the opposite direction, that is, the true direction of movement, and a downward jet turn display command is issued. Also, during the pick-up movement from side B to side A, an upward jet turn display command is issued. When the CRT display circuit 42 is in operation, the built-in character generator displays "JET" on the center of the CRT 45 in a blue background as shown in Figure 7.
The seven characters “TURN” will be displayed, and display block B will be displayed.
1, B2, B3, . . . are displayed in sequence in a U-shape. For example, when a command to display a downward jet turn is input, the state a is shown as the arrow in Figure 1.
Block B1 lights up from then on, and then the adjacent blocks light up one after another, and after going through states b and c and all the blocks lighting up, it returns to the original state a (for example, one rotation takes 2 seconds), and the display command is issued. While being entered,
This action will be repeated. Regarding the display command for upward jet turn, lighting starts from the block B23 side.

FIG. 9 is a diagram summarizing the generation timing of the above-mentioned jet turn display commands, in which the jet turn display commands are issued according to each mode of the command means 30, 31, and 32, and the lead-in of the transition destination surface is The display command ends when the switch is turned ON, the spindle motor 3 is reversed, and the lead-in part is released after the lead-in signal is detected, and the display command ends, and the normal display or the access display indicating that the chapter is being searched is displayed. to move to.

Based on the display command, the LED display circuit 43
It drives the digitron display section 50 shown in the figure. This digitron display section 50 is arranged on the front panel of the video disc device body,
“▽”, “△” characters and 10 LED L1,
L2... are arranged in a U-shape. LED here
L1 corresponds to blocks B1, B2, and B3 on the CRT, and the other LEDs also correspond to three blocks on the CRT, respectively. “△” flashes in response to the downward jet turn display command.
Adjacent LEDs from LED L1 light up one after another and the CRT
Rotate in correspondence with the block above. For the upward jet turn display command, "▽" will flash and the LED will also light in the opposite direction. It is also used for displaying when the digitron display section 50 is accessed and played back, and when accessing, the "△" or "△" of the access destination blinks. During playback, "△" lights up when playing from the bottom of the disc, and "▽" lights up when playing from the top.

Since track jumps are repeated during the jet turn of the support base 6 and when the pick-up accesses a predetermined chapter after this movement is completed, the mute circuit 44 functions so as not to display information from the pick-up 4 on the CRT during this access. .

(G) Effects of the Invention As described above, according to the present invention, a predetermined movement display is made when the pick-up moves from side A to side B or from side B to side A, regardless of the true direction of movement. No matter which direction the disc is held by, the user can always easily recognize the transition from the A side to the B side or from the B side to the A side.

[Brief explanation of the drawing]

All drawings relate to one embodiment of the present invention, and FIG.
Figure 2 is an explanation diagram of the operation of the CRT display. Figure 2 is an illustration of the jet turn operation. Figures 3 and 4 are diagrams showing the relationship between the support base and the lower and upper linear parts. Figure 5 is the disk and pickup position. Relationship diagram, No. 6
The figure is a block diagram of the entire circuit, Figure 7 is a diagram showing the CRT display, Figure 8 is a diagram showing the digitron display section, Figure 9 is a diagram showing the display timing, and Figure 10 is a diagram showing the disk installation. . 1... Turntable, 4... Pickup,
6...Support base (pickup moving means), 9
. . . disk, 42 . . . CRT display circuit (display means), 101 . . . code separation circuit (holding surface detection means).

Claims (1)

[Scope of Claims] 1. A disk on which information is recorded on the front and back sides, and labels relating to the information on each side are placed on opposite sides, and a single pick-up that reproduces information from both sides of the disk; a pick-up moving means for moving the pick-up to the side of the disk on which playback is desired among both sides of the disk; A disk double-sided playback device comprising notification means for notifying a movement state in a first form when moving to the side and in a second form different from the first form when moving from the back side to the front side.