JPS61162840A - Reading device for recording information - Google Patents

Abstract

PURPOSE:To read recording information by moving an element array or a recording medium successively in the array direction by a small pitch extent at every time, and photodetecting light by a photoelectric converting element array at each movement position and performing arithmetic processing. CONSTITUTION:Light from a light source 41 such as a laser or LED is passed through the slit-shaped aperture 42a of a light shield plate 42 to illuminate a card 23. This card 23 has a difference in reflection factor between a part where pits are formed in correspondence to recording information and a part where no pit is formed and part of light reflected by the card 23 which is irradiated in a slit shape is reflected by a half-mirror 45 to form an image on a photodiode array 22 through an image forming lens 46. When the image forming lens 46 is capable of magnifying, one pitch of recording information is expanded and pitch intervals of a photodiode array 22 need not be a natural multiple or integral multiple of recording information pitch invariably, which is utilized. Consequently, a read of extremely high density recording information is realized by the relatively simple structure.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a recorded information reading device suitable for reproducing high-density recorded information.

[Technical background of the invention and its problems] In recent years, industries related to information have made remarkable progress, and recorded information is becoming more dense.

For this reason, for example, even with the size of a conventional magnetic card, for example, Nikkei Electronics March 21, 1983
As disclosed in Japanese No. PP 129-136, a card capable of recording and reproducing information at a very high density using one light is hereinafter referred to as an optical information recording card. ) has been announced.

An optical recording medium that records or reads using light.℃
Optical disks and magneto-optical disks have been in the stage of practical use for some time now, and their recording and reading methods are well known, but in the case of optical information recording cards, there are limitations due to the card shape and recording density. From the viewpoint of increasing the optical density, it is not appropriate to record concentrically or spirally and read out by rotational scanning as in conventional optical discs. Alternatively, a method of rotating a plurality of heads to perform recording and reading in an arcuate manner may be considered, but this would make the recording and reproducing apparatus extremely complicated and require sophisticated control technology.

Therefore, in the case of an optical information recording card, it is natural that the recording shape is linear as shown in FIG. That is, along each raster (line) parallel to the horizontal or vertical direction of the optical information recording card 1, the information to be recorded is binarized so that the areas where recording bits 2 are formed and the areas where they are not formed correspond to each other. It is formed using a focused laser beam or the like.

However, as a device for reading out the recorded information,
For example, it is conceivable to scan the head used to read the optical disk along each raster (or line) in the figure, or to read out each pit by scanning the card 1 itself by moving it left and right or back and forth. . However, reading out each bit increases the burden on the scanning system, takes time to read out, and complicates the scanning mechanism, so it is not an appropriate method, especially when reading or reproducing.

Therefore, as shown in Fig. 9, 7 otodiode arrays 3
There is a device which reads recorded information by making recording bits 2 formed along each raster of the card 1 correspond to each photodiode element of the photodiode array 3 using an imaging lens 4. In this case, the recording pitch is 1
If it is on the order of 0 to several tens of microns, current diode array manufacturing technology can sufficiently provide one-to-one correspondence.

In addition, if one-to-one correspondence is possible, if the protective film 6 of the card 1 is sufficiently thin and the substrate 7 is transparent, as shown in FIG. Or, by setting the state close to this and illuminating the card 1 with illumination light from the back side, the transparent substrate 7.
Each bit 2 without a light-shielding film in recording 11!9 in which bit 2 is formed or not formed through the under layer 8
It is also possible to receive and reproduce the light passing through the portion where the light is formed by the light receiving (photosensitive portion) 3a of the corresponding photodiode element.

However, when the recording pitch becomes on the order of μm due to higher density due to advances in manufacturing technology, it becomes extremely difficult to manufacture a photodiode array with the same pitch.

In other words, even when using a photodiode array with a pitch coarser than the recording pitch, it is necessary to be able to read out data. Furthermore, it is generally desired that the number of elements in a seven-otodiode array be smaller than the number of recorded data provided along each line.

[Object of the Invention] The present invention has been made in view of the above-mentioned points. It is an object of the present invention to provide a recorded information reading device that can read out data using a photoelectric change element array having a smaller number of elements than the number of recorded data formed by the method.

[Summary of the Invention] The present invention provides recording data that is formed at a high density along a line on a recording medium at a minute pitch, at a pitch that is an integral multiple of the recording data.
Further, by arranging photosensitive parts each having a size that covers this integer number of recorded data and using a photoelectric conversion element array, this element array or the recording medium is sequentially moved in the arrangement direction by the minute pitch amount, and each movement At each position, light is received by a charging conversion element array, and recorded data is read out by performing arithmetic processing.

[Embodiments of the invention] Hereinafter, the present invention will be specifically explained with reference to the drawings.

Figures 1 to 6 relate to the first embodiment of the present invention.
The figure shows the structure of the reading device in the first embodiment in block form, and FIG. As the photodiode array is sequentially scanned for each pitch, the optical information recording data corresponding to each photodiode changes sequentially, and FIG. 3 shows the recording data stored in the shift register. Figure 4 shows the output pulses of the clock generator, Figure 5 shows the data states of each part during the calculation process, and Figure 6 is obtained in time series in the first embodiment.
The photoelectric conversion signal output series stored in the memory is shown. 1st
The reading device 21 of the embodiment has the configuration shown in FIG.

That is, as shown in FIG. 2, the 7-otodiode array 22 as a photoelectric conversion element array used in the first embodiment stores each recording data Xj, x2, x3, .・・X5((
m times the minute pitch (abbreviated as X) (m is a natural number,
or a positive integer (in the figure, m=5).

..., p1pH). ) and the gap between adjacent photosensitive parts ""pi+1 is given by the above data Xj, x
j, approximately equal to the gap of 1. ), each photosensitive portion p has m pieces of data X.

l J J+1゜..., X j
+4 is completely included. Furthermore, each data
, are pit-formed portions and pit-free portions corresponding to the information to be recorded at each minute pitch, and the light transmittance (or reflectance) is different in both sections.

Thus, this photodiode array 22 can be moved one pitch at a time in the direction of the data column of data (Xj) by a driving device 24, as shown in FIGS. 2(a), (b), and (c). be.

The driving of the driving device 24 is controlled by a control circuit 25, and as shown in FIG. 2(a), the first data
It is set so that only one optical signal is incident. (For the photosensitive portion p2, data x2 to x6 are input. Optical signals corresponding to Xj to xll, . . . are input to the photosensitive portion p3.) When set in this state,
The control circuit 25 sends a starting trigger signal etc. to the clock generator 26, starts the clock generator 26, generates N clock pulses, applies them to the 7-otodiode array 22, and applies them to the photosensitive section. Transfer the analog photoelectric conversion output of (p.) and output it sequentially from the output terminal,
This output is amplified by the amplifier circuit 27, and the A/D converter 2
8, the signal is converted into a gain value and stored in the shift register 29 to which the clock pulse is applied.

Note that this shift register 29 is capable of storing N+1 serial data, and each register RK
(K=1.2...N+1) is, for example, a 5-bit configuration □. Therefore, at the end of the first scanning, as shown in FIG. is X
j +XQ +...+×11. ...(each digital quantity) will be stored. Also, in this case, the control circuit 25 takes in the data x 1 of the register R2 and holds it internally.

Next, the control circuit 25 causes the drive device 24 to move the photodiode array 22 by one pitch of the optical information recording data (x,) to set it in the state shown in FIG. 2(b). At the same time, the control circuit 25 outputs 0 as preset data to the latch circuit 30 via the line 30a.
Start the clock generator 26 again and output the output terminal 26a.
, 26b output clock pulses CKs and CK2 shown in FIGS. 4(a) and 4(b), respectively. In this case, clock pulse CK2 is clock pulse C
It will be generated only while the first clock of K1 is being generated.

By the way, the output of the latch circuit 30 is subtracted from the output of the register R1 of the shift register 29 by the first subtraction circuit 31, and the subtracted output is input to the second subtraction circuit 32. Thus, the second subtraction circuit 32 causes the register RN+1 of the shift register 29 to
The above-mentioned subtraction output is subtracted from the output of , and is input to the memory 33 , and is also input to the latch circuit 30 .

Therefore, in the state set as shown in FIG. 2(b), the fourth
When the clock pulses CKt and GK2 in figures (a) and (b) are output, the first clock pulse causes
The output of the latch circuit 30 is O.

The shift register 29 is moved one place to the right and becomes register R1.
data x1. Register R2 contains data x2+...
+x6. . . . Data XI +X2 (digital amount - hereinafter referred to as "digital m") taken in through the photosensitive portion p1 is input to the register RN+1. This state is shown in FIG. Therefore, in this state, the output of the subtraction circuit 31 is data X1+the output of the subtraction circuit 32 is data x2, and this data x2 is written into the first memory cell of the memory 33.

Due to the second clock pulse in the clock pulse CK1, the output of the latch circuit 30 becomes data x2, and the register R1 of the shift register 29 has data x1+.
...+x6. ..., the resistor RN+1 has the photosensitive part p2.
The received data becomes X3+...+×7, so the output of the subtraction circuit 31 becomes X3+...+×6, and the output of the subtraction circuit 32 becomes (X3+-+Xy)-(Xa+.-
+Xs)=Xy, and this data x7 is stored in the memory 33.
will be written to.

The third clock pulse causes the output of the latch circuit 30 to output data x7. Register R1 of shift register 29
is data×7+...+×11. ..., register RH
+1 becomes data x8+...+X12, so the output of the subtraction circuit 32 is converted to data
It becomes 2.

In this way, by N clock pulses CKz (and one CK2), x2,
7, X12. "." De1 is output in the order of X2+5(N-1) and written into the memory 33 one after another.

(The number of data S is, for example, 5N.) Next, the photodiode array 22 is moved by one pitch and the second
It is set to the state shown in Figure (C), and in this state it is set to the state shown in Figure 4 (a).
), 2 is now output as the clock pulse CK1.0 shown in (b).

Accordingly, the output of the latch circuit 30 becomes 01 shift register 2 due to the first clock pulse CK1.0 to 2.
The register R1 at 9 has data X1+X2 (because the light received by the photosensitive portion p1 in FIG. 2(b) and the shifted one remains).

Register R2 contains data X1 +X2 +X3,...
, the register RI1+1 becomes data X1 +X2 +X3 from the photosensitive portion p1 in FIG.

The second output pulse causes the output of the latch circuit 30 to change to the data X3. Register R1 of shift register 29
is X3+...+X7. ..., register RN+1 is X
++−+Xa, and the output of the subtraction circuit 32 is data x 8
becomes.

In this way, the N clock pulses cause Xa, Xf3, X, 13 . ...,
Each data of X3+5(, -1) is sequentially outputted and written into the memory 33.

The above-mentioned operation is repeated, and at the mth (here, fifth) time, the control circuit 25 changes the preset value for the latch circuit 30 from the above-mentioned 0 to the initially read data x 1.

In this case, the relationship between the photosensitive area (p) and the data (xj) column is as shown in FIG. 2(C), so the relationship in FIG.
), (b), the latch circuit 3 is activated by the first clock pulse in the clock pulses CKI and CK2 shown in
The output of 0 is XI, and the register R1 in the shift register 29 is the output of the photosensitive portion p before moving by one pitch in FIG. 2(d).
Data received at 1x1+...+x5. ..., the register RN+1 becomes X2+-'·lX6 from FIG.
6 is output, written to the memory 33, and input to the latch circuit 30.

With the second clock pulse, the output of the latch circuit 30 is data x6, and the register R1 is x6+...lX
10,..., register RH+1 is X7+...lX
11, so the output of the subtraction circuit 32 becomes data X11.

In this way, the output of the latch circuit 30 is data x 645 (N-2) by the Nth output clock pulse.
X5N-4, register R1 is data x5N-4" X5
N-3゜+...lX5N,..., register RN+1
is the data X5N-3+X+...lX5N (the number of data (xj) is S-mXN like N-2 above), so the subtraction circuit 3
The output of 2 is 0.

Therefore, by the N pulse trains, the subtraction circuit 32 outputs
6 lX it, X 161””, X6+5(N
-2), O data output series are obtained. By replacing the last output 0 with the data x1 secured at the beginning, one line of data is stored in the memory 33 as the sixth
The data is captured in the arrangement shown in the figure, and main scanning along the line is completed.

Next, the control circuit 25 moves the photodiode array 22 or the card 23 one line in the sub-scanning direction and repeats the same operation, thereby being able to sequentially read the data of each line.

In addition, in the first embodiment, when comparing FIGS. 2(a) and (d), p2a"" pld, p3a=p2d
.

..., p(N+1)a-pNd. Here a.

d represents each photosensitive area in FIGS. 2(a) and 2(d), respectively.

In the first embodiment, in order to obtain one line of data, the photodiode array 22 is operated m+1 times,
It was necessary to move it sideways m times. On the other hand, the following modification example can also be used.

The number of elements in the photodiode array 22 is increased by one element, another set of shift registers 29 is prepared, and the data of N+11[1 obtained in the first clock pulse train is held in this shift register. By using the held data as data for the m+i-th circuit, the number of times the photodiode array 22 is operated and the number of times it is shifted laterally can be reduced by one.

In the above-described embodiments and modifications, the photodiode array 22 is placed in substantially close contact with the seven photodiode array 22 or the card 23 as shown in FIG.
Alternatively, it is assumed that the card 23 is main-scanned along a line, and then the card 23 or photodiode array 22 is sub-scanned (moved) in a direction perpendicular to the main-scanning direction.

However, the present invention is not limited to this, and can also be configured as the second embodiment shown in FIG. 7, for example.

That is, the light 1i41 from a laser or LED is blocked by the light shielding plate 4.
The light passes through a slit-shaped opening 42a (in the drawing, it is elongated in a direction perpendicular to the plane of the paper) in 2, and is irradiated onto the card 23 by a condensing lens 43. In this card 23, the reflectance of the part where the bit formed corresponding to the recorded information is formed and the part where the bit is not formed is different, and the light reflected by the card 23 illuminated in the slit shape is reflected by the half mirror 45. A portion is reflected and imaged onto the photodiode array 22 by the imaging lens 46 . In FIG. 7, the direction of the seven rays of the photodiode array 22 is perpendicular to the plane of the paper, so the seven photodiode array 22 is main-scanned by an amount equivalent to the recording data pitch in the direction perpendicular to the plane of the paper. (Of course, the card 23 side may also be moved). In this case, if the imaging lens 46 has the same magnification, the pitch equivalent amount will be one pitch amount of recorded information. If the imaging lens 46 is not the same magnification, but can be magnified, for example, it will be the amount that magnifies one pitch of the recorded information, and the pitch interval of the photodiode array 22 is not necessarily a natural number multiple of the recorded information pitch or a (positive) integer. It has the advantage that it does not need to be doubled. Of course, the pitch of the photodiode array 22 needs to be a natural number multiple of the recorded information image, and can be set to a natural number multiple of the recorded information image, for example, by using a zoom optical system or the like. Note that depending on the case, the image forming lens 46 may be used to reduce the size.

Further, although reflected light is used in the second embodiment, the present invention can be similarly applied to transmitted light. The application of the present invention is not limited to the above-mentioned optical information recording card reading device, but can be widely applied to general imaging devices as long as there are no restrictions on S/N or exposure time. It is.

In other words, it is possible to realize a high-resolution W imaging device using an image sensor with a limited density.

[Effects of the Invention]- As described above, according to the present invention, from a high-density recording information medium that is recorded in a line and can be read by light, one line of data that is coarser than the recording pitch of this medium and is The photoelectric conversion element array of the photosensitive part, which is smaller than the number of recorded data, is moved relatively in the line direction, and is captured as an optical signal of recorded data, and is subjected to arithmetic processing so that it can be sequentially read out as a single recorded data. Therefore, reading out extremely high-density recorded information can be realized with a relatively simple structure.

[Brief explanation of the drawing]

Figures 1 to 6 relate to the first embodiment of the present invention.
The figure is a block diagram showing the configuration of the first embodiment, and the second figure shows a state in which the photodiode array is closely attached to the card and corresponds to recorded data formed along a line, and a state in which the photodiode array is moved one pitch at a time. An explanatory diagram showing the state, FIG. 3 is an explanatory diagram showing data stored in the shift register by the first clock pulse train, and FIG. 4 is an explanatory diagram showing the clock pulse of the clock generator applied to the photodiode array etc. , FIG. 5 is an explanatory diagram showing the data storage state of each part during operation, FIG. 6 is an explanatory diagram showing the data string written to the memory, and FIG. 7 is a configuration showing the optical system in the second embodiment of the present invention. Figure, 8th
The figure is a front view showing the recording bits formed on the card.
The figure is a perspective view showing a conventional example, and FIG. 10 is a sectional view showing a state in which a seven-otodiode array is closely attached to a light-transmissive card in order to read out recorded information on the card. 21... Recorded information reading device 22... Photodiode array 23... Card 24... Drive device 25
... Control circuit 26 ... Otsukku generator 28 ... A/D converter 29 ... Shift register 30 ... Latch circuit 3
1.32...Subtraction circuit 33...Memory wipe 7 Figure 1 Figure 2 (a) (b) (C) XI X2 X3 X4 X5 X6 (d) XI X2 X3 X4 X5 X6 3rd Figure 4 Flash Figure 5 Figure 6 Figure 1□ 1107 Procedural official document (self-prompted) July 3, 1985 Manabu Shiga, Commissioner of the Patent Office 2, Title of invention Recorded information reading device 3, Person making the amendment Relationship to the case Patent applicant representative Satoshi Shimoyama Dept. 5 Date of amendment order (self-motivated) 1. On page 6, line 18 of the specification, it says [...arranged...] Correct it to "...arranged...". 2. On the 18th line of page 8 of the specification, the statement "...the diode array 22 is..." has been corrected to "...the diode array 22 is...". 3. In the 11th line of page 9 of the statement, "Trigger signal, etc." should be corrected to "Trigger signal...". 4, Bright [1m, 9th line of page 12, “...×1
＋...×6..." is replaced with "...×2+...
×6..." will be corrected. 5. In the 3rd line of page 13 of the book, [...×
12°...+×2 +5 (N-1)...'' is replaced by [...X, 2. .... ×2+5(N-1)..." 6. On the 15th line of the 13th page of the specification, there is a statement that says “...is...
・・Data×1+×2+x3...”
・ will be corrected to "X3+×4...+×7...". Figure 5

Claims (2)

[Claims] (1) Reflected light or transmitted light is irradiated onto an optical recording medium that records information using a recording portion in which minute portions with different light reflectances or transmittances are formed at a predetermined pitch along a straight line. In a recorded information reading device that reads information recorded by receiving light in a photoelectric conversion element array, a photosensitive sensor having a pitch that is an integral multiple of the recording pitch of the information and a size that can accommodate each of the information of this integral number of recorded portions is provided. means for moving the photoelectric conversion element array or the optical recording medium in the arrangement direction by the recording pitch at least the integer number of times; A recorded information reading device comprising: arithmetic processing means for reproducing information recorded along the straight line from the output of the integer set of photoelectric conversion signals. (2) The arithmetic processing means includes a shift register capable of holding at least one set of photoelectric conversion signal outputs, and at least one set of values obtained by the same photosensitive section by two consecutive sets of photoelectric conversion output signals. means for time-sequentially outputting from the shift register, first and second subtraction circuits, and a latch circuit having a preset function, wherein the first subtraction circuit is obtained by the same photosensitive section. subtracting the output of the latch circuit from the value belonging to the preceding set among the values,
A patent claim characterized in that the second subtraction circuit subtracts the output of the first subtraction circuit from the value belonging to the latter set, and inputs the output of the second subtraction circuit to the latch circuit. The recorded information reading device according to item 1.