Apparatus for reproducing signals from both sides of discs

• US 4,903,140 A
• Filed: 05/24/1988
• Issued: 02/20/1990
• Est. Priority Date: 05/28/1987
• Status: Expired due to Term

• Current Assignee: Sanyo Electric Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Sanyo Electric Company Limited (Panasonic Holdings Corporation)
• Inventors: Yagi, Nasashi, Okamoto, Kazuyuki
• Primary Examiner(s): Richardson, Robert L.
• Application Number:
  US07/197,879
• Time in Patent Office: 637 Days
• Field of Search: 358/342, 369/32, 369/33, 369/176, 369/199, 369/195, 360/69, 360/75, 360/97.01, 360/98.04, 360/101, 360/104
• US Class Current: 369/199
• CPC Class Codes: G11B 19/04 Arrangements for preventing, inhibiting, or warning against double recording on the same blank or against other recording or reproducing malfunctions
• CPC Class Codes: G11B 33/10 Indicating arrangements; Warning arrangements G11B15/04, G11B19/04, G11B27/34, G11B27/36 take precedence
• CPC Class Codes: G11B 7/08594 to access both sides of the disc with the same head assembly

Abstract

An apparatus for reproducing signals from both sides of a disc which comprises a detector for detecting that the signal reproduction side of the disc opposed to the pickup is being changed over from one side to the other side, and a device for notifying the user that the reproduction side is being changed over according to an output signal from the detector. The notifying device enables the user to properly recognize the state of the pickup during the travel thereof between the both sides of the disc.

Claims

1. An apparatus for reproducing signals from both sides of a disc in succession having at least one pickup movable radially of the disc while the disc is being rotated at a high speed, drive control means for controlling the rotation of the disc and the movement of the pickup, and signal reproduction means having connected thereto the output terminal of the pickup, the apparatus being characterized in that the apparatus comprises means for detecting that the signal reproduction side of the disc opposed to the pickup is being changed over from one side to the other side, and means for notifying the user that the reproduction side is being changed over according to an output signal from the detecting means.

2. An apparatus as defined in claim 1 wherein the disc is an optical disc, and the pickup is an optical pickup for optically reading out the signals from the optical disc, the pickup being coupled to a pickup transport assembly provided with U-shaped guide means, the guide means comprising a pair of straight portions for moving the pickup therealong and along the signal recording face of the disc radially thereof, and a circular-arc connecting portion interconnecting the straight portions, the pickup being movable from one side of the disc to the other side thereof while being inverted by moving along the connecting portion.

3. An apparatus as defined in claim 1 wherein the notifying means has connected thereto a display serving as an external video device and is provided with a control circuit for showing in the form of an image what is to be notified.

4. An apparatus as defined in claim 3 wherein the control circuit shows the direction of movement of the pickup on the screen of the display.

5. An apparatus as defined in claim 1 wherein the notifying means is provided with a circuit for synthesizing what is to be notified as a voice, and a loudspeaker having connected thereto the output terminal of the synthesizing circuit.

6. An apparatus as defined in claim 2 wherein the disc reproduction side change-over detecting means has means for detecting a lead-out signal from the side of the disc which is subjected to signal reproduction first in a double-side successive reproduction mode, and interprets the detection of the lead-out signal as indicating the start of the reproduction side change-over

7. An apparatus as defined in claim 2 wherein the disc reproduction side change-over detecting means has means for detecting a pickup inversion instruction given to the pickup transport assembly, and interprets the detection of the instruction as indicating the start of the reproduction side change-over.

8. An apparatus as defined in claim 2 wherein the disc reproduction side change-over detecting means has means for detecting that the pickup has moved out of the lead-in area on the side of the disc to be subjected to signal reproduction after the other side thereof, and interprets the detection of the moving-out of the pickup as indicating the completion of reproduction side change-over.

9. An apparatus as defined in claim 2 wherein the disc reproduction side change-over detecting means has means for measuring a predetermined period of time after a lead-out signal has been detected from the side of the disc to be subjected to signal reproduction, and interprets the lapse of the predetermined time period as indicating the completion of the reproduction side change-over.

10. An apparatus as defined in claim 3 wherein the disc reproduction side change-over detecting means has means for computing the position of the pickup from the amount of rotation of a feed motor for transporting the pickup radially of the disc, and the position of the pickup detected by the computing means is shown on the screen of the display.

11. An apparatus as defined in claim 4 wherein the disc reproduction side change-over detecting means has side data detecting means for reading out side data from the signal recording face of the disc, and means for judging the orientation of the disc from the side data obtained by the side data detecting means, and when reproduction from the side specific to the disc is to be followed by reproduction from the other side thereof irrespective of the orientation of the disc, the control circuit controls the display based on the result obtained by the judging means so that the display shows a definite direction of movement at all times.

12. An apparatus for reproducing signals from both sides of a disc in succession having at least one pickup movable radially of the disc while the disc is being rotated at a high speed, drive control means for controlling the rotation of the disc and the movement of the pickup, and signal reproduction means having connected thereto the output terminal of the pickup, the apparatus being characterized in that the apparatus comprises side data detecting means for reading out side data from the signal recording face of the disc, means for detecting the side of the disc opposed to the pickup, and display means for showing the side data when the side data is recorded on the disc and for showing the content of an output from the side detecting means when no side data is recorded on the disc.

13. An apparatus for reproducing signals from both sides of a disc in succession having at least one pickup movable radially of the disc while the disc is being rotated at a high speed, drive control means for controlling the rotation of the disc and the movement of the pickup, and signal reproduction means having connected thereto the output terminal of the pickup, the apparatus being characterized in that the apparatus comprises address designating means for designating the address where reproduction by the pickup is to be started and side data, and access control means for controlling random access to both sides of the disc based on the side data designated by the address designating means.

14. An apparatus for reproducing signals from both sides of a disc in succession having at least one pickup movable radially of the disc while the disc is being rotated at a high speed, drive control means for controlling the rotation of the disc and the movement of the pickup, and signal reproduction means having connected thereto the output terminal of the pickup, the apparatus being characterized in that the apparatus comprises random access means for shifting the pickup to a desired address position, lead-out detecting means for reading out a lead-out signal from the signal recording face of the disc, and display means for indicating that no designated address is found when the lead-out signal has been detected by the lead-out detecting means in a random access mode.