JPS6244670B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a microfilm search device for searching for desired information in a microfilm having a large number of frames recording information.

In recent years, as the amount of information has increased, microfilm has been widely used to record large amounts of information, such as documents, books, newspapers, and drawings. That is, the information is reduced and photographed and recorded on a microfilm, and the information recorded on the microfilm is read by a reader. By the way, as a method of selecting desired information from a large amount of information recorded on microfilm, generally speaking, search marks for large items and small items according to the information recorded on microfilm are used to correspond to the information recorded on microfilm. By optically detecting this search mark with a reader and counting the signal obtained by electrical conversion with a counter, the desired large item or small item information is selected and placed at a predetermined position. I'm trying to stop it.

That is, in the conventional microfilm, as shown in the first diagram, a large item search mark 1 is placed on the line of the first row above the frame 2, which has been photographed by reducing the original image information, and a small item search mark 3 is placed on the line of the first column above the frame 2, which is taken by reducing the original image information. When searching for a large item, detect the large item search mark 1 in Figure 1 with a photoelectric conversion element, and when searching for a small item, search for a small item. Mark 3 was detected by another photoelectric conversion element. With this type of microfilm, a large amount of information can only be classified into two items, and in order to classify the information into even smaller items, the first and second rows of lines parallel to the longitudinal direction of the film are used. On the line of another column, for example, it is necessary to provide a medium item search mark, which limits the size of the panel,
High precision is required to record information. Furthermore, a new photoelectric conversion element or the like is required to detect the search mark of the middle item, which complicates the mechanism of the search device.

The present invention provides a microfilm retrieval device capable of searching for information on a desired item from a microfilm having information with an increased number of classification items while keeping the same mark recording space as conventional ones. It is.

The present invention will be explained below using specific examples shown in the drawings.

FIG. 2 shows an embodiment of the microfilm used in the present invention, in which original image information is reduced and recorded in each frame 4, _{5 1} ... 5 ₆ , 6 of a long microfilm F. One information group with related information contents is recorded in consecutive frames 5 _{1 .} . . 5 ₅ in order. In the first row of lines (above the frame) parallel to the longitudinal direction of the microfilm,
A first counting mark 12 having a density different from that of the periphery is recorded, and a second counting mark 12 is recorded on the second row of lines (below the frame). This mark 11,
12, depending on the information content of each frame, the lines in the first and second columns, only the lines in the first column, or the lines in the second column.
They are selectively provided only in the column lines corresponding to each frame.

For example, if the original image information is a contract, frame 5
The information recorded in ₁ ...5 _{and 6} becomes one contract, and the information recorded in other frames 4 and 6 becomes contracts for other matters. Frame 5 ₁ is the first of one contract.
The page information is recorded, and the following 5 frames are displayed in page order.
Information is recorded in ₂ ...5 ₆ . In frame 5 ₁ at the beginning of one contract, counting marks 11 and 12 are provided on the lines of the 1st and 2nd columns to distinguish the contract as a major item, and the 2nd, 4th, and 6th In frames 5 ₂ , 5 ₄ , and 5 ₆ , counting marks 12 are provided only on the second column line to indicate the provisions in the contract as middle items, and in the 3rd and 5th frames 5 ₃ , 5 ₅ , In order to indicate clauses in the contract as sub-items, counting marks 11 are provided only on the first column line.
That is, the contract is classified into three items, and counting marks are provided for each frame to represent large items, medium items, and small items according to the information content of the frames. In addition,
The correspondence between the distribution items and the form of the counting mark is as follows.
It is not limited to the above embodiments, for example,
Large items may be represented by counting marks provided only on the first line. Furthermore, the counting marks may not have the same shape but may have different sizes.

FIG. 3 shows a mark detector, which is composed of a lamp 15 and a photoelectric conversion element 16 that are placed opposite each other across the mark movement path of the microfilm F. When the film F is fed, the light from the lamp 15 that enters the photoelectric conversion element 16 changes due to the movement of the counting mark, so that an electrical signal is obtained from the photoelectric conversion element.

Figure 4 shows the control circuit of the search device.
1 is a first detector that detects the counting mark 11; 2;
Reference numeral 2 denotes a second detector for detecting the second counting mark 12, each of which is constructed as shown in FIG. 23 is an input device for inputting the search number of the desired information to be searched; 25...29 is an AND gate; 3
1 is the inverter, 32 is the or gate, 35,3
6, 37 are flip-flops, 40, 41, 42
is a subtraction counter; 44 is a film feeding control circuit;
45 is a film feeding motor that drives the capstan roller 17. Counter 40, 41, 4
2 outputs a signal from the terminal when the count reaches "0".

The operation of the above device will be explained with reference to the signal waveforms in FIG. FIG. 5 shows signal waveforms of each output line in FIG. 4, and those with the same symbols as those in FIG. 4 are indicated by waveform lines with the same symbols in FIG. The microfilm is set in a predetermined search start state, and the contract number A, article number B, and item number C of the desired contract to be searched are input into the input device 23. This results in
Among the numbers entered into the input device, the contract number A is stored in the first counter 40, and the article number B is stored in the second counter 40.
The item number C is stored in the counter 41, and the item number C is stored in the third counter. flipflop 35,3
6 and 37 are assumed to be in a reset state before the start of the search. Next, when the search start key on the input device 23 is pressed to command the start of the search, a start signal is output from the terminal h, and the flip-flop 35 is set by this start signal, and the film is fed via the film feed control circuit 44. The motor 45 is driven, the capstan roller 17 is rotated, and the microfilm F is fed. By feeding the microfilm, the first and second detectors 21,
22 outputs signals as shown in FIGS. 5a and 5b. a' is a signal obtained when the first counting mark 11 is detected, and b' is a signal obtained when the second counting mark 12 is detected. 1st, 2nd
When the detectors 21 and 22 simultaneously detect marks, the AND gate 25 opens, and the AND gate 25 outputs the signal f' shown in FIG. is sent to the first counter 40 as a counting signal and subtracted and counted. As a result, the count content of the first counter 40 becomes "A-1". As the microfilm is fed, the content of the first counter 40 becomes smaller, and when the content of the first counter 40 reaches "0", that is, the signal of the counting mark of the frame corresponding to the desired contract number. When counted, a signal is output from terminal 1 of the first counter 40, and this output signal resets the flip-flop 35 and sets the flip-flop 36.
The microfilm continues to be fed, after which the first detector 21 detects the first counting mark and the second
When the detector 22 does not detect the second counting mark, the AND gate 26 opens, and the AND gate 26 outputs a signal e' shown in the waveform e in FIG. 5. This output signal causes the AND gate 28 to open, and the signal e' is sent to the first counter 41 as a counting signal and is subtracted and counted. Next, when the content of the second counter 41 becomes "0", that is, when the signal of the frame mark corresponding to the desired article number in the desired contract is counted, the terminal of the second counter 41 is A signal is output from m, and this output signal resets the flip-flop 36 and sets the flip-flop 37. Microfilm F
is further fed, and after this, when the first detector 21 or (and) the second detector 22 detects the counting mark, the OR gate 32 opens and the OR gate 3
2 to 5, the signal d' shown in the waveform d in Figure 5 is output, and this output signal opens the AND gate 29, and the signal
d' is subtracted and counted by the third counter 42 as a counting signal. Next, when the content of the third counter 42 becomes "0", that is, when the signal of the counting mark of the frame corresponding to the desired item number in the desired contract is counted, the third counter 42 is A signal is output from the terminal n, and the flip-flop 37 is reset by this output signal, the film feeding motor 45 is stopped via the film feeding control circuit 44, and the capstan roller 17 is stopped.
A brake mechanism (not shown) is activated to stop the microfilm F. As a result, the frame recording the desired items of the desired contract is stopped at the photographing position, and the information of this frame is projected onto the screen by the reader. In the above embodiment, when searching for a frame classified as a medium item, it is sufficient to input the desired contract number, article number, and item number "0".

In at least two rows of lines parallel to the longitudinal direction of the microfilm, counting marks are provided on the lines of the rows selected according to the information content of the frames, corresponding to each frame, so that the number of rows is N. Information can be classified into 2 ^N -1 items. As a result, when the number of columns is kept the same, the microfilm of the present invention can increase the number of classification items compared to the conventional method without increasing the number of columns. There is no need to sacrifice any information storage space. Also,
Without increasing the number of mark detectors, it is possible to provide the same number of mark detectors as before and search for information on more detailed classification items than before.

[Brief explanation of the drawing]

FIG. 1 is a front view of a conventional microfilm, FIG. 2 is a front view of a microfilm used in the present invention, FIG. 3 is a side view of a mark detector, and FIG. 4 is a control circuit diagram of a search device. FIG. 5 is a diagram showing the output waveform. F... Microfilm, 11, 12... Counting mark, 21, 22... Detector, 40, 41,
42...Counter.

Claims (1)

[Claims] 1. A first mark and a second mark are provided in at least two lines parallel to the frame arrangement direction on the microfilm, and the first mark and the second mark, only the first mark, or the first mark are provided corresponding to each frame. 2
a first detection means for detecting a first mark on a microfilm on which only marks are selectively provided;
a second detection means for detecting the mark; a first counting means for counting a first signal output when the first detection means and the second detection means simultaneously detect the first mark and the second mark; and only the first mark. a second counting means for counting a second signal output when detecting the second signal;
a third counting means for counting a third signal output when either the mark or the second mark is detected;
A microfilm retrieval device comprising means for comparing the address of a target image on the microfilm with the count value of each counting means and stopping the transfer of the microfilm.