JPH02294943A - Optical card processor - Google Patents

Abstract

PURPOSE:To exactly record and reproduce data by always executing drive control to the separating distance of an objective lens to a focus position even when the data recording and reproducing surface of an optical card is inclined in a line against a moving direction. CONSTITUTION:When an optical card 11 is inclined against a conveying-direction and reciprocated in a monitoring section, a focus error signal S1 corresponding to the inclination is outputted from a light receiving diode 44. The signal S1 is applied through a lens driving signal output means 46 to a lens driving signal waveform storing means 52 as a lens driving signal S2, converted to a current value corresponding to an waveform change and inputted to a CPU 56. The CPU 56 stores the waveform of the signal S2 and outputs a lens driving signal S2', which drives the objective lens to the focus position in parallel with the movement of the card 11, through a power amplifier circuit 51 to a driving coil 45. Accordingly, the data can be always exactly recorded and reproduced.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention provides a method for reciprocating a card-shaped recording medium (hereinafter referred to as an optical car 1) so that the data recording/reproducing surface of the optical cart can be reciprocated. This relates to an optical card processing device equipped with an optical head for recording and reproducing data on an optical card, and more specifically, it relates to an optical card processing device equipped with an optical head that records and reproduces data on an optical card. It relates to driving and controlling the objective lens so that the focus position of the lens is aligned with the data recording/reproducing surface of the optical card.

(Prior Art) This type of optical card processing device has a light source, an objective lens, and how much the distance between the data recording/reproducing surface of the optical card and the objective lens deviates from the focal length of the objective lens.
A focus error signal output means (for example, a light receiving diode) outputs a signal according to the amount of focus error (focus error amount) as a focus error signal, and a focus error signal output means (for example, a light receiving diode) operates in response to input of a lens drive signal to move the objective lens to the focus position (data recording/reproducing surface of the optical card). and a lens driving means (for example, a driving coil) for driving the objective lens to the position of the objective lens when the distance between the objective lens and the objective lens matches the focal length of the objective lens, and a light receiving means as a focus error signal output means. Some devices are equipped with a lens drive signal output means for supplying a lens drive signal to a drive coil serving as a lens drive means in response to a focus error signal from a guide.

In such an optical card processing device 45, a light beam is focused and irradiated from a light source built in the front end of the optical card onto the data recording/reproducing surface of the optical card through an objective lens. A focus error signal corresponding to the amount of focus error of the objective lens is supplied from the light receiving guide to the lens drive signal output means. The lens drive signal output means outputs a lens drive signal corresponding to the focus error amount to the drive coil. This drives the objective lens to the focus position.

(Problems to be Solved by the Invention) Next, the problems to be solved by the present invention will be explained with reference to FIGS. 5 and 6.

FIG. 5 is a J-diagram showing the optical card +00 that reciprocates along the moving direction line A-B and the optical head 101, and FIG. 6 shows the focus error signal Sl output from the light receiving diode, It is a figure which shows the waveform of lens drive signal S2 output from a lens drive signal output means.

The optical head 101 shown in FIG. 5 includes a head body 102 with a built-in light source, a drive coil 103 disposed on the head body 102, and an objective lens 104 driven by the drive coil 103.

In the configuration shown in FIG.
It is moved back and forth in the B direction. A light beam from a light source built into the optical head 101 is focused and irradiated onto the data recording/reproducing surface of the optical card +00 via the objective lens 104.

In such a case, the data recording/reproducing surface of the optical card 100 may be tilted at an angle of θ with respect to the moving direction line due to an assembly error inside the optical card processing device.
- May be sent in the B direction.

However, assuming that the inclination angle of the data recording/reproducing surface of the optical card 100 is zero, the distance between the data recording/reproducing surface of the optical card 100 and the objective lens 104 is set to the focus position F1 of the objective lens 104. Therefore, if the optical card 100 has the above-mentioned inclination, the light beam will be focused and irradiated onto the data recording/reproducing surface F2 of the optical card 100, which is not the focus position Fl of the objective lens 104.

In such a defocused state (accurate recording and reproducing of data on the data recording and reproducing surface of the J optical cart 100 becomes impossible. A focus error signal S1 corresponding to the focus error amount is output.In other words, the focus error amount of the objective lens and the lens drive amount of the objective lens in the focus direction are expressed on the vertical axis.
In FIG. 6, where the horizontal axis shows the feeding time of the optical card 100, when the optical card 100 is fed, for example, in the B direction (outward path) with respect to the optical head +01, the focus error amount gradually increases. , the focus error amount gradually decreases when the image is sent in eight directions (return path).
The waveform of the focus error signal S1 is also as shown in FIG. The focus error signal Sl is then given to the lens drive signal output means, which outputs the lens drive signal S2 to the drive coil 103 in response to the focus error signal Sl. Therefore, the objective lens 104 is driven by the driving coil 103 by a lens driving amount corresponding to the lens driving signal S2 and positioned at the focus position. Since a time delay occurs in the movement, when the objective lens 104 is driven to the focus position after the delay time, it will be deviated from the current focus position.

Therefore, in conventional optical card processing devices, the current separation distance between the optical card 100 and the objective lens 104 is the focus position of the objective lens 104. Therefore, it has not been possible to record or reproduce data on the data recording/reproducing surface of the optical card 100 with sufficiently satisfactory accuracy.

The present invention has been made in view of the problems mentioned in 2.
Even if the optical card has the above-mentioned inclination, accurate recording and reproduction on the optical card can be performed by always keeping the current separation distance of the objective lens from the optical card at the focus position of the objective lens. It is an object.

(Means for Solving the Problems) In order to achieve the above object, the optical card processing device of the present invention has the following configuration.

That is, this optical cart processing device includes a light source means and a light beam from the light source means that is focused on the data recording/reproducing surface of the optical card.
(ii) an objective lens means that can be driven to a focused position (focus position); a deviation distance of the objective lens means from the focus position is detected as a focus error amount, and the shift distance is changed in accordance with the detected focus error amount; a focus error signal output means for outputting a focus error signal having a waveform, and driving the objective lens means to a focus position in response to input of a lens drive signal related to the focus error signal from the focus error signal output means. An optical head is provided with a lens drive means and is movable back and forth relative to the optical card, and the lens drive signal corresponding to the focus error signal from the focus error signal output means is transmitted to the lens. A lens drive signal output means for controlling the output to the drive means, and a waveform of the lens drive signal or focus error signal obtained by at least one reciprocating movement of the optical head is stored, and a signal corresponding to the stored waveform is transmitted to the optical card. The present invention is characterized in that it includes a lens drive signal waveform storage means for providing a lens drive signal as a lens drive signal to the lens drive means in parallel with the reciprocating movement of the lens drive means. Note that the stored waveform may be a part of the waveform of the lens drive signal or focus error signal.

(Function) If the optical card is sent in an inclined state, the distance between the data recording/reproducing surface of the optical card and the objective lens will deviate from the focus position of the objective lens means. A focus error signal corresponding to this deviation from the focus position is output from the focus error signal output means. This focus error signal is given to the lens drive signal output means. Then, the lens drive signal output means provides a lens drive signal to the objective lens means (based on the input focus error signal). Thereby, the objective lens means is driven to the focus position 9, and in this case, the waveform of the lens drive signal or focus error signal obtained by at least one reciprocating movement of the optical head, that is, the waveform corresponding to the focus error. is stored in the lens drive signal waveform storage means. After a signal corresponding to the focus error is stored in the lens drive signal waveform storage means, a signal corresponding to the stored waveform is used to drive the lens to the lens drive means in parallel with the reciprocating movement of the optical card. given as a signal.

In other words, the lens drive means operates in response to the storage output from the lens drive signal waveform storage means to drive the objective lens to the focus position in accordance with the timing of the current deviation of the objective lens from the focus position. As a result, the light beam from the light source built into the optical head is always focused onto the optical card at the focus position of the objective lens, making it difficult to accurately record and reproduce data engraved on the optical card. It becomes possible.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings. FIG. 1 is a plan view of an optical card processing apparatus according to an embodiment of the present invention, and FIG. 2 is a sectional view taken along line 1-1 in FIG.

In these figures, reference numeral I indicates the entire optical card processing device. This optical card processing device 1 has two guide shafts 4, 4 disposed in parallel in a case 3 having a card insertion slot 2 to constitute a guide mechanism 5, and a polder 6 can be reciprocated on this guide shaft mechanism 5. At the same time, an optical head 7 is installed on the card insertion side corresponding to the lower part of the transfer path of the porta 6.
and a card feeding mechanism 8 are arranged on the back side.

The holder 6 is supported by the guide shaft 4 with bearings 9 provided on both sides. A card holding portion 10 is formed on the bottom surface of this holder 6, and this card holding portion 1! The j part 10 is aligned with the card insertion position "12" of the case 3. Inside the card insertion slot, there is a detector 12 for detecting the inserted optical card 11, and a detector 12 for detecting the operation of the detector 12. A card loading/ejecting mechanism 13 is provided which operates to automatically eject the optical card 11 to the card holding portion 10 of the holder 6.Card loading/ejecting mechanism 13
is located below the holder 6, and is equipped with a pair of left and right loading cams 15.15 on the rotary shaft 14, and a speed reduction mechanism 1 consisting of a pulley and a bell 1.
The loading motor I7 is connected to the loading motor I7 via the motor I7. The loading cam l5 is a substantially semicircular cam made of a rubber material, and has a flatness force of 1 and a surface 18 of -1 of the rotating shaft 14.
When positioned horizontally on the - side, it is placed close to the bottom surface of the holder 6 in a non-contact manner. In this way, when the loading cam 15 is rotated by the operation of the loading motor 17, the spherical cam surface 19 is advanced to a fixed position, and the flat cam surface 18 faces the polder 6 again, and the motor 17 stops. On the rear side of the holder 6, there is a holder 6.
A guide shaft 20 that is perpendicular to the direction of movement is provided to support the slide portions + and l'2+, and this slide portion 21 is connected to the card feeding mechanism 8. The card feeding mechanism 8 is
Two support shafts 22 are mounted on a fixed frame 34 in the case 3, pulleys 23 and 24 are respectively fixed to both support shafts 22, and an endless belt 25 is wound and stretched.
A connecting pin 26 is vertically provided at a suitable position, and this connecting pin 26 is connected to the slide portion +, l'2]. One spindle 2
A bobbin 27 is fixed to the shaft at the bottom of the pulley 27.
A drive motor 29 that rotates in one direction is coupled to the shaft 22 via a transmission means 28 such as a belt, and an encoder 30 is attached to the other shaft 22.

The optical head 7 is supported by a lead screw 31 and a guide shaft 32 arranged in a direction perpendicular to the moving direction of the holder 6, and the lead screw 3l is connected to a head feed motor 33 capable of forward and reverse rotation. Therefore, when the head feed motor 33 is operated, the optical head 7 is moved by the guide shaft 32 and the lead screw 31 in a direction perpendicular to the feeding direction of the optical card I1, thereby accessing the information recording section of the optical card I1.

FIG. 3 is a diagram showing the optical head in the optical card processing apparatus of this embodiment and its internal block circuit. In FIG. 3, reference numeral 7 denotes the optical head, which includes an LED 40 as a light source means, a collimating lens 41, a beam splitter 42, and a light beam from the LED 40 to an optical card 11. ” The position at which the optical card 11 is focused on the optical card 11 (focus position)
an objective lens 43 that can be driven to
A light receiving diode 44 as a focus error signal output means for detecting the deviation distance from the focus position as a focus error amount and outputting a focus error signal S1 having a waveform corresponding to the detected focus error amount; A drive film 45 is provided as a lens drive means for driving the objective lens 43 to the focus position in response to the input of the lens drive signal S2 related to the focus error signal S1 from the diode 7I7I.

46 is a focus error signal S from the light receiving diode 44
The lens drive signal output means 46 outputs and controls the lens drive signal S2 to the drive coil 45 in response to A differential amplifier circuit 47 that performs dynamic amplification, a subtraction circuit 48 that outputs the difference between the focus error signal S2 differentially amplified by the differential amplifier circuit 47 and a given setting signal S3, and A servo circuit 49 that operates in response to the difference and outputs a lens drive signal S2 related to the focus error signal Sl, an adder circuit 50, and a lens drive signal S2 from four servo circuits via the adder circuit 50, or a lens drive described later. It is comprised of a power amplification circuit 51 that power amplifies the lens drive signal S2' from the signal waveform storage means 52 and outputs the amplified signal to the drive coil 45.

52 stores the waveform of the lens driving signal S2 within the monitor section obtained by one reciprocating movement of the optical head 7, and also outputs a signal corresponding to the stored waveform as the lens driving signal S2'.
A lens drive signal waveform storage means outputs the waveform of the lens drive signal to the drive coil 45 via the power amplification circuit 51 of the I-nons drive signal output means 46 in parallel with the reciprocating movement of the optical cars 1 and 7. The storage means 52 includes a current detection circuit 53 that detects the current of the lens drive signal S2 from the power amplification circuit 51, a low-pass filter 54, a Δ/D converter 55, a CPU 56, and a D/Δ converter. vessel 57
It is composed of.

Next, the operation of the lens drive signal waveform storage means 52 will be explained with reference to FIG. 4.

First, the optical card 11 is transported back and forth once within the monitor section shown in FIG. When the optical card 11 is tilted with respect to its reciprocating transport direction, the light receiving tie auto 47 outputs a focus error signal S1 corresponding to the tilt. This focus error value 18, Sl is given to the lens drive signal waveform storage means 52 as a lens drive signal S2 via the lens drive signal output means 46. Within the lens drive signal waveform storage means 52, the lens drive signal S2 is converted by the current detection circuit 53 into a current value corresponding to the waveform change, and is also converted into a low-pass current value within the lens drive signal waveform storage means 52. The signal is input to the CPU 56 via the filter 54 and A/D converter 55. The CPU 56 stores the waveform of the lens drive signal S2 within the monitor period from the converted current value, and also outputs a signal corresponding to the stored waveform during the operation period according to the input of the signal S4 indicating the moving position of the optical card l1. In parallel with the movement of lens 11, the lens drive signal S2' is outputted to the power amplification circuit 51 of the lens drive signal output means 46. The power amplification circuit 51 amplifies the power of the lens drive signal 82' and outputs the amplified signal to the drive coil 45. The drive coil 45 drives the objective lens 43 to the focus position using this lens drive signal S2'. Therefore, since the objective lens 43 is driven to the focus position in advance, the light receiving die size is -1 and 4.
The focus error signal S1 within the operation section from 7 does not change its waveform OJ like it does within the monitor section.

In other words, even if the optical card 11 is tilted, the objective lens 4
Since the optical card 3 is driven to the blank position simultaneously and in parallel with the change in inclination, it is possible to accurately record and reproduce data on the data recording and reproducing surface of the optical card II.

In this embodiment, the waveform of the lens drive signal S2 for one reciprocating movement of the optical card I1 is stored in the storage means 52, but the waveform of the lens drive signal S2 is stored in the storage means 52.
may be stored, and the focus position of the objective lens 45 may be controlled based on this stored focus error signal sequence S1, and the stored waveform of the signal in this embodiment also corresponds to one reciprocating movement of the optical card 1. The focus position of the objective lens 45 is determined by memorizing a part of the waveform and predicting the entire waveform produced by one reciprocating movement of the optical head 1 using the part of the waveform. It may also be controlled.

(Effects of the Invention) As is clear from the above explanation, according to the present invention,
Even if the data recording and reproducing surface of the optical card is tilted with respect to the moving direction line, the separation distance of the objective lens from the data recording and reproducing surface of the optical card is always the focus position of the objective lens with respect to the current tilt. Therefore, it is possible to accurately record and reproduce data on the optical card.

[Brief explanation of the drawing]

FIG. 1 is a mechanical configuration diagram of an optical card processing device according to an embodiment of the present invention, and FIG. 2 is a sectional view taken along line 1 and 2 in FIG.
FIG. 3 is an internal circuit diagram of the same embodiment, and FIG. 4 is a signal waveform diagram of each part for explaining the operation of the same embodiment. 5 is a side view of an optical card and an optical head, and FIG. 6 corresponds to FIG. 4, and is used to explain the problems of the conventional optical card processing device. It is a diagram. 7... Optical head, 1l optical card, 40... Light source,
43 - Objective lens, 44 Light receiving diode (focus error output means), 45 Drive coil (lens drive means), 46 Lens drive signal output means, 52 - Lens drive signal waveform storage means.

Claims (2)

[Claims] (1) Light source means, which focuses the light beam from this light source means onto the data recording/reproducing surface of the optical card, and is capable of being driven to a position (focus position) where the data recording/reproducing surface on the optical card is focused. and a focus error signal output means for detecting a deviation distance of the objective lens means from the focus position as a focus error amount and outputting a focus error signal having a waveform that changes in accordance with the detected focus error amount. , and a lens drive means for driving the objective lens means to a focus position in response to input of a lens drive signal related to a focus error signal from the focus error signal output means, and a lens drive means for driving the objective lens means to a focus position; an optical head that is relatively movable back and forth; lens drive signal output means for controlling the output of the lens drive signal corresponding to the focus error signal from the focus error signal output means to the lens drive means; The waveform of the lens driving signal or focus error signal obtained by at least one reciprocating movement of the head is stored, and a signal corresponding to the stored waveform is sent to the lens driving means in parallel with the reciprocating movement of the optical card. An optical card processing device comprising: a lens drive signal waveform storage means for providing a drive signal. (2) The optical card processing device according to claim 1, wherein the stored waveform is a part of the waveform of the lens drive signal or focus error signal.