JPH0353717B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a playback device for a disc 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 (G11B3/
085), 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.

(C) Problems to be Solved by the Invention In the prior art described above, when both sides of a record are continuously played back, the playback screen does not display any advantage during the period when the linear tracking arm is moving from one side to the other side. During this period, the user could not determine whether the linear tracking arm was moving or whether an abnormal condition had occurred and playback was impossible.

(d) Means for Solving the Problems The present invention is characterized in that while the pick-up scanning the disk is moving from one side to the other, a notification means is used to notify the movement state.

(E) Effect Since the present invention is constructed as described above, when the pickup is transferred from one side of the disk to the other side, the user can confirm the transfer.

(F) Embodiment A first 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.

Reference numeral 1 denotes a turntable that is rotated by a spindle motor 3, and a disk 9 is clamped onto this turntable and rotates together with the turntable. On the A side (front side) (bottom side in the figure) and B side (back side) (top side in the figure) of the disk 9,
Information such as audio signals and video signals is optically recorded from the inner circumference to the outer circumference.

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. It has guide rollers 8a, 8b that are mounted on the upper and lower chassis 49a, 49b, and a guide roller (not shown) that is pivotally supported at the same height as the guide rollers 8a, 8b.
A guide hole 1 into which linear guide balls 11a and 11b arranged to extend in the radial direction can be fitted.
2 is formed.

Reference numerals 17 and 18 denote a pair of support blocks that guide the movement of the support base 6, and include upper linear portions 17a and 18a extending above the disk 9 and lower linear portions 17c and 18c extending below. and connecting portions 17b, 18b that connect the linear portions 17a, 18a, 17c, 18c, and racks 19, 20 and guide grooves 21, 22 are formed on opposing inner peripheral surfaces.

By engaging the pinions 7a, 7b with the racks 19, 20 and loosely fitting the guide rollers 8a, 8b into the guide grooves 21, 22, respectively, the support base 6 moves on the support blocks 17, 18, and is moved in a lower straight line. While moving parts 17c and 18c, guide hole 1
The guide ball 11b is fitted into the guide hole 12 and guided in a straight line, and the lower surface of the disk 9 can be scanned.
The guide ball 11a is fitted into the connecting portions 17b, 1 and guided in a straight line, making it possible to scan the upper surface.
By moving 8b, continuous scanning of the lower and upper surfaces becomes possible.

The disk 9 will be explained with reference to FIG. 5. On the inner circumference of the disk 9, there is a number of tracks in which lead-in signals indicating the start of recording information are recorded on predetermined lines 17H and 18H during the vertical blanking period.
A lead-in section 20a with 900 tracks is formed, a lead-out section 20c with 600 tracks on which a lead-out signal indicating that information recording has been completed is formed on the outermost periphery, and a program section 20b between the two.
Video and audio signals are recorded at a constant linear velocity. As shown in FIG. 5, when the support base 5 is in the position A of the upper linear portions 17a, 18a or the position D of the lower linear portions 17c, 18c, the pick-up 4 is placed on the lead of the A side or the B side of the disk. Similarly, when the pick-up 4 is at the outermost peripheral positions B and C of the upper and lower linear parts 17a, 18a, 17c, and 18c, the pick-up 4 scans the lead-out part of side A or B. It is detected that the playback of each side is completed. Also, lead-in part 2
A label is affixed to the inner circumferential portion from 0a to provide guidance regarding the information recorded on the opposite side. In other words, the label affixed to side A contains information about side B, and conversely, the label affixed to side B contains information about side A.
Information on the area is provided.

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

In FIG. 6, double-sided access command means 30
is means for issuing a double-sided access command in order to shift to playback of a desired chapter on side B by operating an operation button during playback of side A, for example. The JRT TURN command means 32 is a means for issuing a double-sided program command to play a predetermined chapter on side B after playing a predetermined chapter on side A.
With the TURN mode specifying means 38 specifying a so-called double-sided continuous playback mode in which both sides of the disc 9 are automatically played back, the leadout detection circuit 39 detects a leadout signal for side A. This is a means of issuing a TURN command when the still,
In contrast to the double-sided playback mode, there is also a single-sided playback mode that plays only one side of the disc. In this single-sided playback mode, when a lead-out signal is detected,
The pick-up returns to the inner periphery of side A.

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 the commands from the command means 30, 31, 32, the spindle motor control circuit 33 controls the spindle motor when the supporting base 6 is on the lower linear portions 17c, 18c side and side A is to be reproduced, as described later. 3
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 reproducing side B 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 playback of both sides is started by operating the Ryogoku playback mode button, the support base 6 is moved to the tips of the lower linear parts 17c and 18c, that is, the A of the disk 9.
Turn on the lower lead-in switch 41, which will be described later, located at the innermost circumference of the surface, and 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, and when the lead-in detection circuit 36 confirms this lead-in signal, the rotational speed of the spindle motor 3 changes to enable reproduction of the program section 20b. When this value is reached, the pick-up control circuit 37 starts a pick-up track jump (for example, at 5x speed), and this operation is repeated until the spindle motor 3 exits the lead-in section, and the rotational speed of the spindle motor 3 reaches a value at which information can be reproduced. While being held, it quickly escapes from the lead-in portion. When the lead-in section escapes, the lead-in signal is no longer detected, and code data such as the chapter number (inserted at 18H) and program time (inserted at 17H and 18H) are extracted instead. It is determined by In addition, the upper and lower linear parts 17a, 18a, 17c, 18c
At the tip of the upper and lower lead-in switches 40,
41 is disposed, and the support base 66 is moved to a position where the pick-up 4 can scan the lead-in part as described above.
When this reaches, a part of the support base 6 comes into mechanical contact and is turned on, starting the spindle motor 3 and controlling the rotation of the feed motor 5. After the lead-in section 20a escapes, the program section on the A side is played back, demodulated by a demodulation circuit (not shown), and a desired video signal is displayed on the CRT 45, and the lead-out section is further scanned and read out. When the signal is read out, the feed motor 5 shifts to high speed rotation, and the support base 6 is rotated from the lower linear portions 17c, 18c to the upper linear portion 1 via the connecting portions 17b, 18b.
7a and 18a (this transition from the lower side to the upper side is called an upward jet turn), and when the upper reed switch 40 is turned on, the feed motor reverses and shifts to a lower speed rotation, so that side B can be regenerated. be done. Incidentally, during this upward jet turn, the spindle motor 3 rotates in reverse at 1800 rpm.

When reproducing side B, the spindle motor 3 reaches a predetermined rotational speed (reproducible) when reproducing the lead-in section, and after the lead-in section has escaped, 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, the innermost circumferential position of side A is reached, this position is set as a standby position, and the continuous reproduction of both sides is completed.

During double-sided continuous playback, the display/mute control circuit 35 simultaneously detects the lead-out signal on side A.
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. This display command indicates that the support base 6 moves from the lower linear portions 17c, 18c to the upper linear portion 17a,
18a, and the process is stopped when the lead-in portion of side B is removed. Similarly, the support base 6 extends from the upper linear portions 17a, 18a to the lower linear portion 17.
Also when shifting to 18c and 18c, a command to display a jet turn from the lower side to the upper side, that is, upward, is issued simultaneously with the detection of the lead-out signal for side B.

Here, when the actual moving direction of the support base 6 or the pick-up 4 and the displayed direction are reversed, that is, when the support base 6 is moving from the lower side to the upper side, Conversely, if the support base 6 is moving from the upper side to the lower side, a command to display a jet turn in the upper direction from the lower side to the upper side is issued, but this is because the user cannot Since it recognizes that the side to which the label related to the surface is attached is side A, and the side to which the label related to side B is attached is the side B (actually the opposite as mentioned above), it is true that the mechanism is This is because the user's recognition is prioritized over the movement of the machine, and the display is displayed in the opposite direction to the movement of the mechanism, so as not to confuse the user.

In a mode other than double-sided continuous playback mode, that is, during side A side playback using the double-sided access command means 30, the playback suddenly shifts to a desired chapter on side B (not limited to the first chapter immediately after the lead-in section, but the nth chapter). When a command is issued, the /
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 holds true when a predetermined chapter on side A is specified during playback of side B.

When the reproduction of the chapter nb of the side B is started after the reproduction of the chapter na of the side A as programmed in advance by the double-sided program commanding means 31, the CRT display circuit 42
Then, a command to display a downward jet turn is issued to the LED display circuit 43. Also, the chapter on side B
When proceeding to playback of chapter na' on side A after nb playback, 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, and after the lead-in signal is detected and the spindle motor reaches the reproducible rotation speed,
Move to the desired chapter (with CLV disks, the rotation speed of the spindle motor must be changed according to the radial position, so be sure to
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.

When the CRT display circuit 42 is activated, the CRT (notification means) 45 is activated by a built-in character generator.
As shown in Figure 7 above, the seven characters "JRT TURN" are displayed in the center in a pullback state, and display blocks B ₁ , B ₂ , B ₃ . . . are displayed in sequence in a U-shape. . For example, when a downward jet turn display command is input, block _B1 lights up from state a as shown by the arrow in Fig. 1, and then the adjacent blocks light up one after another, passing through states b and c, and then as shown in state d. After all the blocks are lit, the device returns to the original state a (for example, one rotation takes 2 seconds), and this operation is repeated while the display command is input. For an upward jet turn display command, 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 command is issued according to each mode of the command means 30, 31, and 32, and the lead-in of the destination surface is The display command ends when the switch is turned ON, the spindle motor 3 is reversed, the lead-in signal is detected, and the lead-in part escapes, and the display command ends, and the normal display or access display indicating that the chapter is being searched is displayed. to move to.

The LED display circuit (notification means) 43 drives the digitron display section 50 shown in FIG. 8 based on display commands. This digitron display section 50 is arranged on the front panel of the video disc device body, and has the characters "▽" and "△" and 10 LEDs.
(L ₁ )(L ₂ )... are arranged in a U-shape. Here, the LED (L ₁ ) corresponds to blocks B ₁ , B ₂ , and B ₃ on the CRT, and the other LEDs also correspond to two to three blocks on the CRT, respectively. In response to the downward jet turn display command, “▽” flashes, and the LEDs adjacent to LED (L ₁ ) light up one after another.
It rotates in correspondence with the block on the CRT. For the upward jet turn display command, "△" will flash and the LED will also light in the opposite direction. Further, the digitron display section 50 is also used for displaying during access and reproduction, and when accessing, "△" or "▽" of the access destination blinks. During playback, “△” appears when playing from the bottom of the disc, “▽” when playing from the top.
lights up.

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. .

In this embodiment, the true moving direction of the pick-up and the display direction are intentionally reversed, but it is also possible to easily display the true moving direction by making them the same. It goes without saying that it is also possible to process the operations using software using a microprocessor.

Next, a second embodiment of the present invention will be described. It should be noted that the same parts as in the first embodiment described above are given the same reference numerals and the explanation thereof will be omitted.

Similar to the display/mute control circuit 35 described above, the notification/mute control circuit 8D controls the subsequent CRT display circuit 42 and LED display circuit 43 to indicate an upward or downward jet turn during double-sided continuous playback or program playback over both sides. In addition to issuing a display command, an announcement command for an upward or downward jet turn is issued to the voice synthesis circuit 81.

The voice synthesis circuit 81 has a memory in which a message is stored in advance, and upon receiving an announcement command, outputs the message in the form of voice from a speaker (notification means) 82 at a subsequent stage.

By the way, as messages stored in memory, for example, as soon as an upward or downward jet turn is started, "Jet turn start" is issued, and just before the end of the jet turn, "Jet turn end" is issued. It is possible to set it as follows. In this case, the output timing of the "Jet Turn End" message is based on the lead-in of the destination surface.
If you synchronize with SW off-ON, or measure the time required for the entire jet turn process in advance,
It is possible to determine how many seconds after the announcement command the message should be issued. Also, you can change the start and end times with a buzzer sound, etc.
When receiving an announcement command for an upward jet turn, change the message to "Jet turn to SIDE B" and when receiving an announcement command for a downward jet turn, change the message to "Jet turn to SIDE A" to move to either side. It is also possible to check whether it is inside.

(G) Effects of the Invention As described above, according to the present invention, when the pick-up moves from one side of the disk to the other side, the transition status is notified by the CRT display, LED display, or audio output, so the user can It is useful to be able to confirm the transition.

In addition, by simultaneously announcing the direction of movement,
The user can reliably grasp the destination surface, and when performing a search immediately after moving between surfaces, it is possible to prevent the user from mistakenly performing a search on the surface opposite to the desired surface.

[Brief explanation of drawings]

1 to 9 relate to the first embodiment of the present invention, FIG. 1 is an explanatory diagram of the operation of a CRT display, FIG. 2 is an explanatory diagram of the jet turn operation, and FIGS. 3 and 4 are an illustration of the support base and Figure 5 is a diagram showing the relationship between the lower and upper linear parts, Figure 5 is a diagram showing the relationship between the disk and the pick-up position, Figure 6 is the overall circuit block diagram, Figure 7 is a diagram showing the CRT display, Figure 8 9 is a diagram showing the digitron display section, FIG. 9 is a diagram showing the display timing,
FIG. 10 is a circuit block diagram of a second embodiment of the present invention. 4...Pickup, 6...Support base (Pickup moving means), 9...Disk, 32...
CRT (notification means), 43... LED display circuit (notification means), 81... speaker (notification means).

Claims (1)

[Scope of Claims] 1. A disk on which information is recorded on the front and back sides, a pick-up for optically scanning the disk to reproduce information, and moving the pick-up so that both sides of the disk can be scanned. a pick-up moving means for causing the pick-up to move the disk; and a notification means for notifying transition information indicating that when the pick-up scans the disk from one surface to the other surface, the transition information indicates that the transition is in progress; What is claimed is: 1. A double-sided disc playback device comprising information regarding a transition direction indicating whether the transition is to a double-sided disc.