below , one embodiment of an optical information recording and reproducing method and device relating to this invention is described in detail with reference to the accompanying drawings . since the optical card used in this embodiment is of similar composition to the conventional optical card 500 and the optical information recording and reproduction device is of similar composition to the conventional optical information recording and reproduction device 510 , these are described with reference to fig6 - 9 . fig1 is a diagram illustrating an optical card and optical head in an optical information recording and reproducing method and device relating to this invention . in fig1 section a ( a 1 , a 2 , a 3 ) is a section where the relative speed of movement between the optical card 500 and the optical head 514 is accelerated to a prescribed speed v 1 in order that the optical information recording and reproduction device 510 can record or reproduce information ; section b is a section where the relative speed of movement between the optical card 500 and the optical head 514 is held constant ( v 1 ) and information recording or reproduction is carried out ; and section c ( c 1 , c 2 , c 3 ) is a section where the relative speed of movement between the optical card 500 and optical head 514 is decelerated to zero . here , section a 2 is a section where the relative speed of movement between the optical card 500 and the optical head 514 is temporarily held at a constant speed ( v 2 ) during the acceleration from zero to v 1 , and the optical information recording and reproduction device 510 performs a track jump operation in this section a 2 . similarly , section c 2 is a section where the relative speed of movement between the optical card 500 and the optical head 514 is temporarily held at a constant speed ( v 2 ) during the deceleration from v 1 to zero , and the optical information recording recording and reproduction device 510 performs a track jump operation in this section c 2 . sections a 2 and c 2 can be set such that the speed is held constant at any position in the acceleration or deceleration periods of the relative speed of movement . in practice , in order to record or reproduce information by reciprocal movement of the optical card 500 , the track jump operation can be carried out in either section a 2 during acceleration or section c 2 during deceleration . control for performing a track jump operation during acceleration or deceleration is performed by the cpu 511 or mpu 512 , which operate the various sections of the optical information recording and reproduction device 510 on the basis of processing commands recorded in a memory device ( omitted from the drawings ). here , a track jump operation will be described with reference to fig2 and fig3 . fig2 is a diagram illustrating relative speed of movement and pulse voltages , and fig3 is a flowchart showing the sequence of a track jump operation . when the optical information recording and reproduction device 510 starts reciprocal movement of the optical card 500 ( step 101 in fig3 ), firstly , the mpu 512 applies an accelerating pulse ( voltage v 1 ) to the x direction drive motor 516 , thereby accelerating the optical card 500 to a prescribed speed v 2 ( section al in fig2 step 102 ), whereupon it applies a constant - speed pulse ( voltage v 3 ) to the x direction drive motor 516 ( section a 2 , step 103 ), and when the optical card 500 has reached a constant speed ( section a 2 , yes at step 104 ), the af / at control circuit 518 opens the at control loop ( section a 2 , step 105 ), and the track jump circuit 517 applies a track jump pulse to an actuator 548 which drives the object lens 545 ( section a 2 , step 106 ). next , the track jump circuit 517 applies a brake pulse to the actuator 548 such that the beam spot comes to rest over the desired information track 504 ( section a 2 , step 107 ), the af / at control circuit 518 closes the at control loop ( section a 2 , step 108 ), and the mpu 512 again applies an accelerating pulse ( voltage v 1 ) to the x direction drive motor 516 , causing the optical card 500 to accelerate to a prescribed speed v 1 ( section a 3 , step 109 ). when the relative speed of movement of the optical card 500 reaches the prescribed speed v 1 , the mpu 512 applies a constant - speed pulse ( voltage v 2 ) to the x direction drive motor 516 ( section b , step 110 ), and then the optical card 500 has assumed a constant speed ( section b , yes at step 111 ), the optical head 514 records or reproduces information ( section b , step 112 ). when the beam spot reaches a prescribed position on the optical card 500 due to the movement of the optical card 500 , the mpu 512 applies a decelerating pulse ( voltage − v 1 ) to the x direction drive motor 516 ( section c , step 113 ), and when the relative speed of movement of the optical card 500 reaches zero ( section d , yes at step 114 ), it switches the direction of movement of the optical card 500 ( section d , step 115 ). thereupon , returning to step 102 , the mpu 512 applies an accelerating pulse ( voltage − v 1 ) to the x direction drive motor 516 , thereby accelerating the optical card 500 to a prescribed speed − v 2 ( section e 1 , step 102 ), whereupon it applies a constant - speed pulse ( voltage − v 3 ) to the x direction drive motor 516 ( section e 2 , step 103 ), and when the optical card 500 has assumed a constant speed ( section e 2 , yes at step 104 ), the af / at control circuit 518 opens the at control loop ( section e 2 , step 105 ), and the track jump circuit 517 applies a track jump pulse to the actuator 548 ( section e 2 , step 106 ). thereupon , the track jump circuit 517 applies a brake pulse to the actuator 548 such that the beam spot comes to rest over the desired information track 504 ( section e 2 , step 107 ), the af / at control circuit 518 closes the at control loop ( section e 2 , step 108 ) and the mpu 512 again applies an accelerating pulse ( voltage − v 1 ) to the x direction drive motor 516 , thereby accelerating the optical card 500 to a prescribed speed − v 1 ( section e 3 , step 109 ). when the relative speed of movement of the optical card 500 reaches the prescribed speed − v 1 , the mpu 512 applies a constant - speed pulse ( voltage − v 2 ) to the x direction drive motor 516 ( section f , step 110 ), and then the optical card 500 has assumed a constant speed ( section f , yes at step 111 ), the optical head 514 records or reproduces information ( section f , step 112 ). when the beam spot reaches a prescribed position on the optical card 500 due to the movement of the optical card 500 , the mpu 512 applies a decelerating pulse ( voltage v 1 ) to the xdirection drive motor 516 ( section g , step 113 ), and when the relative speed of movement of the optical card 500 reaches zero ( section h , yes at step 114 ), it switches the direction of movement of the optical card 500 ( section h , step 115 ) and returns again to step 102 . by means of the operation described above , the optical card 500 completes a single reciprocal movement cycle , and this movement is continued as necessary , to record or reproduce information . next , a second embodiment of a track jump operation is described with reference to fig4 and fig5 . fig4 is a diagram illustrating the relative speed of movement and pulse voltages relating to the second embodiment , and fig5 is a flowchart illustrating the sequence of a track jump operation in the second embodiment . when the optical information recording and reproduction device 510 starts reciprocal movement of the optical card 500 ( step 201 in fig5 ), firstly , the mpu 512 applies an accelerating pulse ( voltage v 1 ) to the x direction drive motor 516 , thereby accelerating the optical card 500 to a prescribed speed v 1 ( section a in fig4 step 202 ), whereupon the mpu 512 applies a constant - speed pulse ( voltage v 2 ) to the x direction drive motor 516 ( section b , step 203 ), and when the optical 500 has assumed a constant speed ( section b , yes at step 204 ), the optical head 514 carries out information recording or reproduction ( section b , step 205 ). furthermore , when the beam spot reaches a prescribed position on the optical card 500 due to the movement of the optical card 500 , the mpu 512 applies a decelerating pulse ( voltage − v 1 ) to the x direction drive motor 516 ( section c 1 , step 206 ), whereupon it applies a constant - speed pulse ( voltage v 3 ) to the x direction drive motor 516 ( section c 2 , step 207 ), and when the optical card 500 has assumed a constant speed ( section c 2 , yes at step 208 ), the af / at control circuit 518 opens the at control loop ( section c 2 , step 209 ) and the track jump circuit 517 applies a track jump pulse to the actuator 548 driving the object lens 545 ( section c 2 , step 210 ). thereupon , the track jump circuit 517 applies a brake pulse to the actuator 548 such that the beam spot comes to rest over the desired information track 504 ( section c 2 , step 211 ), and the af / at control circuit 518 then closes the at control loop ( section c 2 , step 212 ), the mpu 512 applies a decelerating pulse ( voltage − v 1 ) to the x direction drive motor 516 , thereby decelerating the relative speed of movement of the optical card 500 until it reaches zero ( section c 3 , step 213 ), and when the relative speed of movement of the optical card 500 has reached zero ( section d , yes at step 214 ), the direction of movement of the optical card 500 is switched ( section d , step 215 ). returning to step 202 , the mpu 512 then applies an accelerating pulse ( voltage − v 1 ) to the x direction drive motor 516 , thereby accelerating the optical card 500 to a prescribed speed − v 1 ( section e , step 202 ), whereupon it applies a constant - speed pulse ( voltage − v 2 ) to the x direction drive motor 516 ( section f , step 203 ), and when the optical card 500 has reached a constant speed ( section f , yes at step 204 ), the optical head 514 carries out information recording or reproduction ( section f , step 205 ). when the beam spot reaches a prescribed position on the optical card 500 due to the movement of the optical card 500 , the mpu 512 applies a decelerating pulse ( voltage v 1 ) to the x direction drive motor 516 ( section g 1 , step 206 ), whereupon it applies a constant - speed pulse ( voltage − v 3 ) to the x direction drive motor 516 ( section g 2 , step 207 ), and when the optical card 500 has assumed a constant speed ( section g 2 , yes at step 208 ), the af / at control circuit 518 opens the at control loop ( section g 2 , step 209 ) and the track jump circuit 517 applies a track jump pulse to the actuator 548 driving the object lens 545 ( section g 2 , step 210 ). thereupon , the track jump circuit 517 applies a brake pulse to the actuator 548 such that the beam spot comes to rest over the desired information track 504 ( section g 2 , step 211 ), and the af / at control circuit 518 then closes the at control loop ( section g 2 , step 212 ), the mpu 512 again applies a decelerating pulse ( voltage v 1 ) to the x direction drive motor 516 , thereby decelerating the relative speed of movement of the optical card 500 until it reaches zero ( section g 3 , step 213 ). when the relative speed of movement of the optical card 500 has reached zero ( section h , yes at step 214 ), the direction of movement of the optical card 500 is switched ( section h , step 215 ), and the process returns to step 102 . by means of the operation described above , the optical card 500 completes a single reciprocal movement cycle , and this movement is continued as necessary , to record or reproduce information . the time periods of sections a 2 , e 2 in the first embodiment and sections c 2 , g 2 in the second embodiment may be set to different times , for example , in cases where the device is jumping to an adjacent information track and cases where it is jumping to an information track several tracks apart , in response to the different times required for track jumping , or they may be set to fixed time periods . moreover , sections for implementing the track jump operation may be provided both in the acceleration region ( a , e ) and in the deceleration region ( c , g ), and track jumping may be performed in a step fashion in cases where the device is jumping to an information track several tracks apart .