JPS634428A - Optical card recording/reproducing device - Google Patents

Abstract

PURPOSE:To prevent malfunction by providing a means confirming the relative position between an optical card and an optical system and a means storing the initial position measured by the said confirming means so as to form a drive signal from the optical card and a reference value of the drive signal of the optical system. CONSTITUTION:The optical card 3 carried from an insertion port is moved in the direction of arrow A by rollers 2A, 2A and loaded to a prescribed position of a cradle 2. As the initial operation, a drive signal is fed to a Y step motor 6 by a command from a system controller 10 and a base 1 is carried in the Y direction where a limit switch 8 exists. When the limit switch 8 is activated by the base 1, the system controller 10 reverses the Y step motor 6 to drive the base 1 reversely. In receiving light beams by a photo sensor 9B by the said reversing, the signal is inputted to the system controller 10, the position is indicated to be a reference position and, for example, the content of the memory representing the present position of the optical cad is made zero by using the signal representing the position is a reference value of the Y axis.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an optical card recording/reproducing device capable of recording information on an optical card or reading information recorded on an optical card. It is.

[Summary of the invention]

The optical card recording/+1j recording device of this invention includes a starting surface,
Alternatively, when the optical card is carried into the apparatus, the L stage detects the relative position between the optical card and the optical system for irradiating the optical spot with the optical card; Storage means are provided which are capable of storing positional data. When accessing a desired information track of the optical card, the amount of movement of the optical system or the optical card is determined based on the data stored in the storage means.
is determined, data can be recorded and reproduced with high precision even on an optical card without a pre-globe.

[Conventional technology]

Optical cards are designed to record information on an optical recording medium using a light spot on the order of several gm, preferably a laser beam spot, or to read recorded information, and can store a larger amount of information than magnetic cards. It has the advantage of being able to accumulate

Conventionally, in order to access such high-density information, a pre-globe G is provided in the longitudinal direction of the optical card as shown in FIG. 7, and the optical head is tracked along this pre-globe G. A method is used in which the information F is recorded or reproduced after searching for the address information ll1iA.

Further, as shown in FIG. 8, a dot-shaped preformat pattern P is formed on the optical recording medium, for example, S
A method has also been proposed in which information is written or read using the central spot So while applying tracking servo using the spots sl and s2 while irradiating three spots consisting of o, Sl, and S2. (Unexamined Japanese Patent Publication 1986)
(Publication No. 229244) [Problems to be solved by the invention] However, optical cards are generally stored in a bare state 5E in a storage case or a pocket, and are often held directly in the hand when used. Scratches and hand stains adhere to the surface of optical recording media made of shiny silver, and these stains cause errors in tracking information, causing tracking errors or impeding accurate reading of address information. There is a problem.

Therefore, the relative movement of the optical card and the optical head that irradiates the optical card with spot light is performed only by a drive mechanism such as a stepping motor, and a predetermined position of the optical card is accessed without using a tracking servo system. However, in this case, the viscosity of the mechanism for moving the optical card or optical head is increased, which increases costs. Changes over time, J9! If there is mechanical looseness or hysteresis due to wear or the like, the true position and the measured position recorded in the system controller etc. will deviate, and if this error accumulates, there is a problem that playback during recording will become inaccurate.

The present invention was made in view of the above problems, and an object thereof is to provide an optical card recording/reproducing device that can accurately access a desired optical information track without using a tracking servo system. It is something that

[Means for solving problems]

The optical card recording/reproducing apparatus of the present invention includes means for confirming the relative position of the optical card and the optical system at the time of startup or card insertion, and means for storing the initial position measured by this confirmation means. is provided to form a reference value for the drive signal of the optical card or the drive value 5) of the optical system.

[Effect]

When the information obtained from the verification means moves through the optical card or optical system, at the time of starting the device (power on), when inserting the optical card, or when accessing the information track of the optical card if necessary, Since this value is added to the control circuit as a reference value for the drive signal, a system controller consisting of an arithmetic memory that is easy to access can be used, and at the same time, various algorithms for checking the initial conditions of the card can be used.

Also, the true position of the optical card (relative to the optical system)
The position of the optical card recorded in the system controller can be matched within an extremely small error range.

〔Example〕

FIG. 1 is a perspective view showing an outline of the operating mechanism of the optical card recording/reproducing apparatus of the present invention, in which 1 is a base, and 2 is slidably arranged on one side of the base 1. The optical card 3 inserted into one side of the cradle is loaded by rollers 2A, 2A (only two are shown).

4A and 4B indicate a guide shaft and a feed screw for moving the base 1 in the Y direction, which move the base 1 in the Y axis direction by a Y step motor 6 stored in the drive mechanism 5. It is.

Similarly, 7 is an X step motor that can move the pedestal 2 in the X-axis direction using a rack mechanism or the like (not shown).

Reference numeral 8 indicates a limit switch of the base 1, and 9A and 9B indicate fort sensors consisting of a light emitting element and a light receiving element, which set the reference position of the base 1.

Note that a reflective type fort sensor may be used, and movement in the Y direction may also be performed by a rack mechanism.

10 supplies predetermined drive pulses to the Y step motor 6 and the X step motor 7 to move the optical card 3 to the
− Indicates a system controller that can be moved to any position on the Y coordinate axis, and this system controller 1
0 is a memory 11.0 for storing an initial value when configured by a CPU or the like. Arithmetic circuits, operation programs for recording/playback, etc. are stored.

Reference numeral 20 denotes an optical head that preferably irradiates a spot of a laser beam onto the optical card 3, and this optical head 20 may include a CCD (CCD) for reproduction as will be described later.

FIG. 2 is a schematic diagram showing the optical system of the optical head 20.
is a galvanometer mirror that is pivotally supported in the Y-axis direction.

This galvanomirror 21 is rotated back and forth within an angle range of 0 by a rotation mechanism (not shown).

22 is a laser light source, 22A is a laser beam, and the laser beam 22A is focused by a focusing lens 23 and irradiated onto the galvanomirror 21.

Then, the reflected light 22B forms a spot light image on the optical card by the objective lens 24.

25 is a light emitting source consisting of an LED, etc., and its output light 25
The light A is irradiated onto the other surface of the galvano mirror 21 via the condenser lens 26. Then, the reflected light 25B enters the photodetector 28 through the slit 27.

Therefore, when the galvano mirror 21 rotates back and forth within the range of angle θ, the laser reflected light 22B forms an image along the recording track pattern of length d in the transverse direction of the optical card 3, as shown in FIG. At this time, when the base l is stepped in the Y direction by the Y step motor 6 described above, an information recording block Sll of l segment is formed. There is address information in the first few lines of each segment, and these reference points can be denoted by Q.

The rotational position of the galvanometer mirror 21 is detected by a photodetector 28 that receives reflected light 25B, which is a result of reflecting light 25A emitted from the light emitting source 25, through a slit 27. In other words, the light passing through the slit 27 is transmitted through the galvano mirror 21.
This becomes intermittent light proportional to the rotating speed of the optical card E, which is converted into pulse signals by the photodetector 28, and each pulse signal indicates the position of the light spot imaged on the optical card E.

Therefore, when this pulse signal is used as a clock signal and a recording signal is supplied to the laser light emitting source 22, data is written at a predetermined position on the recording track by intermittent laser light.

30 is a light source that is irradiated to read data recorded on the optical card, and a cylindrical lens 3
1. The recording area of the optical card is irradiated via the fixed first reflecting mirror 32. Then, the reflected light passes through a fixed second reflecting mirror 33. The light enters the CCD 35 via the cylindrical lens 34, and the l-line data is read out by the C0D3.5.

In this case as well, by stepping the Y step motor 6, the information on the optical card can be sequentially read out, and furthermore, by stepping in the X direction, the data of the next stripe can also be read out.

Next, in the optical card recording/reproducing apparatus of the present invention as described above, the base 1. The driving operation of the pedestal 2 will be explained.

In FIG. 1, an optical card 3 carried in from an insertion slot (not shown) is moved in the direction of arrow A by rollers 2A and 2A, and is loaded into a predetermined position on a cradle 2.

Next, as an initial operation, a drive signal is supplied to the Y step motor 6 by a command from the system controller (hereinafter referred to as system controller) 10, and the base 1
is moved in the Y direction. When the limit switch 8 is actuated by the base 1, the system controller 10 reverses the Y step motor 6 and sends the base 1 backwards, but when the fort sensor 9B receives light due to this reverse transport, the signal is transmitted to the system controller. The signal is input to 10, indicating that the position is the lift wheel position, and the content of the memory indicating the current position of the optical card is set to 0 by the signal indicating this position, and is used as the reference value of the Y axis. Also, set the value in the memory at this position as the origin of the axis coordinates.

FIG. 4 shows a flowchart of such initial position setting in the system controller 10. Limit switches and fort sensors are also provided for the X-axis direction, and by moving the pedestal 2 along the X-axis, It is also possible to set the reference value in memory.

Note that when position detection is performed using Fort Sensors 9A, 9B, or reflective Fort Sensors, hysteresis characteristics are usually given to the on->off and off->on timings to prevent chattering. ing.

Therefore, if the hysteresis loop is large enough to form, the reference value can be detected without providing the limit switch 8.

A flowchart of the system controller IO in this case is shown in FIG.

The data format recorded on the optical card 3 is, as shown in FIG.
S12... is formed of Sin.

The amount of data for each segment (Sin) is preferably 88% of the memory (RAM) in which information to be recorded or reproduced is stored.
This is determined by each state, and error data can be corrected by interleaving within this segment.

The length d of the line is determined by the rotation angle 0 of the galvanometer mirror 21, and no tracking is required.

Information segments are accessed by the system controller 10 by calculating the number of pulses supplied to the X, Y step motors 6.7.

In this case, as described above, since the memory of the system controller 10 has already been initialized by detecting the reference position of the base or cradle, the current relative position of the optical head and optical card is then supplied to the step motor. The value is determined by the number of pulses applied.

Therefore, the pulse fi (X, Y) for moving to the next information segment can be easily calculated by calculating the current position data and the movement destination position data.

What is shown in FIG. 6 is an example of a flowchart showing a recruitment program of the system computer 10 of the present invention that operates after initialization (100 to 105).

As seen in this flowchart, during writing, a pulse for one track is supplied in the Y-axis direction during the return period of the galvanometer mirror 21, and the movement moves to the next line (l l
l~114).

Furthermore, when writing of one segment is completed, if there is more recorded information, the next segment is accessed (115-116), and after all the information has been written in one row of the next segment, the X step motor 7 is A drive signal is provided to access the next stripe segment (117-118). This movement between stripes can be reduced in frequency by making the reading range of the image pickup device (CCD) wider than the recording track.

〔Effect of the invention〕

As explained above, the optical card recording/main device of the present invention can record or reproduce information on a plain optical card without tracking information.
Malfunctions will not occur due to dirt or dust on the card, and the reference position n of the optical system and optical card is detected during the initial setup of the device, and the optical card is adjusted based on the detected value.
Or, since I am trying to set the amount of movement of the optical system,
It is possible to reduce malfunctions caused by rattling, aging, wear, etc. of the drive mechanism.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an overview of the optical card recording/reproducing device of the present invention, FIG. 2 is a schematic diagram showing an overview of the optical system, FIG. 3 is a view showing the recording format of the optical card, FIG. FIG. 5 is a flowchart of initial settings, FIG. 6 is a flowchart of operations during recording, and FIGS. 7 and 8 are diagrams for explaining conventional recording formats. In the figure, 1 is a base, 2 is a pedestal, 3 is an optical card, 5 is a drive mechanism, 6 is a Y step motor, 7 is an X step motor,
8 is a limit switch, 9A and 9B are fort sensors,
10 is a system controller, and 20 is an optical system. Kumosu Kahi 14d Gungi diagram Figure 1 Yuda type clay J diagram Figure 2 Sha 5 Figure 4 Figure 6

Claims (1)

[Claims] an optical system for recording information on or reproducing information from an optical card comprising an optical recording medium without a preglobe; In an optical card recording/reproducing device equipped with a driving means for moving an optical system or an optical card, relative positional information between the optical card and the optical system is measured before recording or reproducing operation. , an initial position memory circuit capable of recording the position information is provided, and the amount of movement is set by a drive signal based on data output from the initial position memory circuit during recording or reproduction. Characteristic optical card recording/playback device.