JPS641780B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an information retrieval device that automatically selects desired information from a film containing a large amount of information.

Generally, in order to search for information on a film, a mark for information retrieval is placed on the side of the frame on which information is recorded, the marks are counted, and the number corresponding to the desired information and the counted mark are added. When the numbers match, the motor that drives the film is stopped.

The search time (speed) can be shortened by increasing the motor speed, but if the film is fed at high speed, the inertia of the motor, delay in brake operation, etc. will cause the number of frames to pass several frames after matching the target number. If it goes too far, the film stops (hereinafter, the period from the point of coincidence until the film stops is called overrun).

Conventionally, as described in Japanese Patent Laid-Open No. 49-99030, for example, marks are counted during overrun, the film is stopped when a set number of marks have been counted, and then the film is reversed. The film is fed at a low speed in the reverse direction, and when the set number of marks are counted during this reverse feeding, the film is stopped and the desired information is stopped at a predetermined position. However, with this stopping method, if there is a long blank area on the film (no mark is recorded in this area) during overrun, or if the end of the film passes through the mark detection position of the mark detector, During overrun, it takes time to count the set number of marks, which increases search time, and marks cannot be detected at the end of the film, making it impossible to return the desired information to a predetermined position. It was hot.

An object of the present invention is to eliminate the above-mentioned disadvantages, and to correctly display desired information even when the distance between frames is constant, there is a large blank space between frames, or the distance between marks is long. It provides a device that can search and locate.

According to the present invention, a frame mark is attached to each frame in which information is recorded, and desired information is retrieved by transporting the film, which has a frame mark attached to a selected frame, in forward and reverse directions. In the search device,
a first counting means for counting each frame mark on the film, a second counting means for counting each frame mark on the film, a film transporting means, a case number of desired information to be retrieved, and the second counting means. storage means for storing the contents of the first counting means when the contents of the first counting means match; and a storage means for storing the contents of the first counting means; for transporting the film at a high speed to search for desired information; When the contents of the counting means match, the film is stopped after the desired information has passed a predetermined position, and then the film is transported at a low speed in the opposite direction to the above, and during this low speed transport, the first counting means The present invention is characterized in that a transfer control means is provided for stopping the film when the contents of the storage means coincide with the contents of the storage means.

The present invention will be explained below with reference to embodiments shown in the drawings.

FIG. 1 shows a microfilm used in the retrieval device of the present invention. The microfilm 1 is made of a long film. A large number of information frames 2 are recorded on the film, and on one side of the frame, A piece mark 3 with a different light transmittance than the surrounding area is recorded for each piece, and a piece mark 4 with a different light transmittance from the surrounding area is recorded on the other side of the piece for each piece of information whose information content is related. do. One piece of information is composed of at least one piece, and when one piece of information is composed of a plurality of pieces, the pieces are arranged in parallel, and the first piece among the pieces is provided with a piece mark.

Note that the frame mark and the subject mark are not limited to those in the embodiments; the frame mark and the subject mark may be provided on the same side of the film, and the sizes of both marks may be different to distinguish them. You can also use the spaces between pieces as marks.

FIG. 2 shows a portion of a microfilm reader equipped with the retrieval device of the present invention. 5 is the first
The supply magazine shown in the figure stores the microfilm 1 in the form of a roll, 6 and 7 are the microfilm 1
Capstan roller, pinch roller,
8 and 9 are film guide rollers, 10 is a take-up reel, 11 is a light source provided on one side of the microfilm feeding path, 12 is a condenser lens that focuses the light beam from the light source 11, and 13 is a feeder. A projection lens is provided on the other side of the passage.

The microfilm 1 is sent out from the magazine 5 by the rotation of the rollers 6 and 7, passes through the projection position between the light source 11 and the projection lens 13, and is transferred to the take-up reel 1.
It is wound up to 0. Note that the reel shaft of the take-up reel 10 is coupled to a drive motor (not shown). Information on the microfilm is illuminated by a light source 11 at a projection position, and is enlarged and projected onto a screen (not shown) by an optical system such as a projection lens 13.

Detectors 14 and 15 are arranged near the projection position and detect marks on the film, and are composed of photoelectric conversion elements that convert optical signals from the marks into electrical signals. The first detector 14 detects the piece mark 3 and outputs a theoretical "1" detection signal when the piece mark is detected, and the second detector 15 detects the piece mark 4 and outputs a detection signal of logic "1" when the piece mark is detected. A detection signal of logic “1” is output to.

16 is a film drive motor that rotates forward and reverse; 17;
18 is a synchronized belt and pulley that transmits the driving force of the drive motor 16 to the capstan roller 6; 19;
is a brake that stops the capstan roller 6,
Reference numeral 20 denotes a member 2 that supports the pinch roller 7 in order to bring the pinch roller 7 into elastic contact with the capstan roller 6.
This is a spring member connected to 1.

The drive motor 16 is driven at at least two speeds, high speed and low speed, and rotates forward or reverse. The capstan roller 6 rotates to feed the film from the magazine 5 toward the take-up reel 10 (hereinafter referred to as forward direction) by the forward rotation of the drive motor 16, and takes up the film by the reverse rotation of the drive motor 16. It rotates so as to return the film from the reel to the magazine 5 (hereinafter referred to as the reverse direction). The brake 19 is normally inactive, allowing the capstan roller 6 to rotate freely, and is activated in response to a stop signal, which will be described later, to forcibly stop the rotation of the capstan roller 6 and stop the film.

FIG. 3 shows the control circuit of the above-mentioned search device, in which 30 is an input key for inputting the case number of desired information to be searched, 31 is an input buffer (consisting of a register, for example) for receiving the input case number, and 32 is a search A start key for instructing the start, 33 a first counter for adding or subtracting the detection signal from the piece mark detector 14, and 34 a second counter for adding or subtracting the detection signal from the piece mark detector 15. It is.

The first and second counters 33 and 34 are switched to addition or subtraction depending on the direction in which the film 1 is fed, and are put into an addition state by a forward rotation signal, which will be described later, and put into a subtraction state by a reverse rotation signal. In addition, in order to prevent erroneous retrieval that may occur when the film feeding direction is changed, when the film feeding direction is changed, only the detection signal of the first mark detected after the change is sent to the first and second counters 3.
A circuit for disabling the first detection signal is provided to prevent counting at 3 and 34. Such a circuit is already known in Japanese Unexamined Patent Publication No. 117550/1983, so the details will be omitted.

35 is a known subtraction circuit, when the contents of the first and second counters 33 and 34 are input, the contents are stored in the minuend part or the subtrahend part, and subtraction (minuend - subtrahend) is performed, and the subtraction result is zero. In this case, a logic “1” completion signal is output from terminal a, otherwise a signal indicating the absolute value of the subtraction result is output from terminal b, and if the sign of the value is positive, a logic “1” signal is output from terminal C. A signal of "1" is output, and if it is negative, a signal of logic "1" is output from the terminal d. 36 indicates a third counter, in which the subtraction result of the subtraction circuit 35 is set from terminal b, and when a pulse signal is input from terminal e, it is subtracted and counted; when a pulse signal is input from terminal f, it is added and counted. However, when the count becomes zero, a logic "1" coincidence signal is output from the terminal g.

F1, F2...F5 are flip-flops, A1,
A2...A9 are AND gates, R1, R2, R3 are OR gates, G1, G2...G4 are gates, 40,
41 and 42 are delay circuits.

Next, the search operation of the above device will be explained. Before performing a search, flip-flops F1, F4, and F5 are in a reset state.

First, enter the case number of the desired information into the input key 30, and the coded case number will be displayed on the input buffer 31.
sent to. Next, when the start key 32 is operated to command a search, the flip-flop F1 is set and gates G1 and G2 are opened.As a result, the case number in the input buffer 31 is transferred to the subtracted part of the subtraction circuit 35, and the second counter The count contents of 34 (the item number of the information currently being projected) are transferred to the subtraction section of the subtraction circuit 35. The subtraction circuit 35 executes subtraction by inputting both signals, and if the result is zero, outputs a completion signal from terminal a, and if not, sets the value of the subtraction result from terminal b to the third counter 36. At the same time, a signal is output from either terminal c or d depending on whether the value is positive or negative.

If the subtraction result is zero, it means that the desired information is placed at the projection position, and flip-flop F1 is reset by the search completion signal from terminal a, and film 1 is not fed. In other words, the contents of the second counter 34 and the case number of the target information match, and the desired information is retrieved, so there is no need to feed the film.

Now, if the subtraction result is not zero and the sign of the subtracted value is positive, the subtraction circuit 35 sets the value in the third counter 36 via terminal b, and at the same time outputs a signal from terminal c to the flip-flop. F2 is set and flip-flop F3 is reset.

On the other hand, the set output signal of logic "1" from the flip-flop F1 is sent to the drive control circuit of the drive motor 16 as a high-speed feed signal through the signal line h, and drives the motor 16 at high speed. Go through and open AND gate A5,
A normal rotation signal of logic "1" is output from AND gate A5. This normal rotation signal is sent to the drive control circuit of the drive motor 16 to rotate the drive motor 16 in the normal direction. Therefore, the film 1 is fed in the forward direction at high speed, and the detection signal output from the frame mark detector 14 during feeding is the first one.
The count is added to the counter 33, and the mark detector 15
The detection signal outputted from the second counter 34 is added and counted. Further, since the flip-flop F1 is set, the AND gate A1 is opened every time the subject mark detection signal is input, and the subject mark detection signal is subtracted and counted by the third counter 36. Note that the AND gate A2 is closed, and the piece mark detection signal is blocked and not sent to the third counter 36. Third
The counter 36 sequentially subtracts the previously set value each time a detection signal is input, and when the value becomes zero, it outputs a coincidence signal from the terminal g. That is, when the third counter 36 counts the detection signal of the subject mark corresponding to the desired information, the content of the third counter 36 becomes zero.

The match signal at terminal g opens AND gate A3 and is sent to brake 19 as a stop signal via signal line i.
is sent to activate the brakes. Therefore, the film 1, which was being fed at a high speed, stops after overrunning after the stop signal is issued. Note that the amount of overrun varies depending on the film feeding speed, braking capacity, etc.

On the other hand, gate G3 is opened by opening OR gate A3, and as a result, the contents of first counter 33 are changed to subtraction circuit 3.
The content of the first counter 33 (corresponding to the frame number of the information currently being projected) at the time when the stop signal is output is stored in the subtraction circuit 35.

Also, by opening the AND gate A3, the delay circuit 40
is activated, and several microseconds after activation, this circuit generates a delay pulse of logic "1", which resets the flip-flop F1 and is sent to the terminal f of the third counter 36 to start the third count. vessel 36
is added and counted. In other words, the content of the third counter 36 is changed by counting the delayed pulses, and the counted content becomes "1". Resetting flip-flop F1 eliminates the high speed feed signal driving motor 16.

Furthermore, the delay pulse of the delay circuit 40 is
1 is activated, and approximately 500 μs to 1 second (this time corresponds to the time until the film stops completely) after activation, a delay pulse is generated from this delay circuit 41, and this delay pulse is transmitted to the flip-flop F4. Set. The logic "1" set output signal of the flip-flop F4 is sent to the AND gate A2 via the OR gate R2 and the signal line j, and is also sent to the drive control circuit of the drive motor 16 as a low speed feed signal to drive the motor 16 at low speed. death,
Furthermore, open AND gate A8 and AND gate A8
A reversal signal of logic "1" is output from the output terminal. This reverse rotation signal is sent to the drive control circuit of the drive motor 16 to reverse the drive motor 16. Therefore, after overrun, the film 1 is fed in the reverse direction at a low speed, and during the reverse feeding,
The AND gate A2 opens when a detection signal is input from the piece mark detector 14, and this detection signal is subtracted and counted by the third counter 36. Note that the detection signal of the first detected mark after reverse transport is not counted by the first and second counters 33 and 34 in order to prevent erroneous retrieval, as described above. Further, AND gate A1 is closed. When the third counter 36 receives one detection signal, its content becomes zero, and the third counter 36 outputs a coincidence signal again from the terminal g.
This coincidence signal opens AND gate A4, which in turn opens gate G4, and the contents of first counter 33 are transferred to the subtraction section of subtraction circuit 35. This coincidence signal is also sent to the brake 19 as a stop signal to stop the film. In other words, when the first frame mark is detected during reverse feeding, the film is stopped.

When the contents of the first counter 33 are stored in the subtraction section, the subtraction circuit 35 executes subtraction, and if the result is zero, outputs a completion signal from terminal a to end the search, and the desired information is captured. be placed in the correct position.
Therefore, even if it is not possible to count the number of frames that have gone too far during overrun, desired information can be correctly positioned.

On the other hand, if the subtraction result is not zero, the subtraction circuit 35
sets the subtracted value in the third counter 36 via terminal b, and at the same time, since the sign of the value becomes negative, a signal is output from terminal d and the flip-flop F2
, and also sets flip-flop F3. Subtraction circuit 35 immediately before overrun
Comparing the count contents of the first counter 33 stored in the subtractive section with the count contents of the first counter 33 stored in the subtractive section when the first piece mark was detected during reverse feeding, it is found that an overrun is occurring. Since the first counter 33 adds and counts the number of detection signals corresponding to the number of frames that have gone too far, the count stored in the subtraction section is larger, and as a result, the sign of the subtraction value becomes negative and the signal is output from terminal d. will be issued.

On the other hand, when the AND gate A4 is opened, the delay circuit 42
is activated, and a few microseconds after activation, this circuit generates a logic "1" delay pulse which sets flip-flop F5 and resets flip-flop F4 via OR gate R1.

The logic "1" set output signal of the flip-flop F5 is sent to the AND gate A2 via the OR gate R2 and the signal line j, and is also sent as a low speed feed signal to the drive control circuit of the drive motor 16 to drive the motor at a low speed. Furthermore, the AND gate A7 is opened via the OR gate R3, and an inversion signal of logic "1" is output from the AND gate A7. Therefore, film 1
is fed in the reverse direction at a low speed, and during the reverse feed, AND gate A2 opens every time a piece mark detection signal is received.
The detection signal of the piece mark is subtracted and counted by the third counter 36.

The third counter 36 sequentially subtracts the set value every time the detection signal is input, and when the value becomes zero, the terminal g
gives a match signal again. In other words, when the third counter 36 counts the detection signal of the first frame mark of the desired information, the content of the third counter becomes zero.

The match signal from terminal g is sent to AND gate A9 through signal line i, and opens AND gate A9.
The logic "1" output signal of AND gate A9 serves as a search end signal to reset flip-flop F5 and actuates brake 19 to stop the film. As a result, the search is completed, the desired information is correctly placed at the projection position, and the desired information can be observed on the screen at the same time as the search is completed.

When searching for new information next time, the search can be performed in the same manner as described above by inputting the case number of the required information into the input key 30 after the previous search is completed. Search is also possible whether the film is sent forward or backward.

Figure 4 shows a microfilm with large blank areas between the frames on the film.Using this microfilm 1', a search is performed.
Film 1' is fed in the direction of the arrow to obtain desired information (A
After detecting the mark 4' of the first frame (consisting of frames 1, A2, and A3), the film overruns,
If the X part on the film is located at the projection position and stopped, the number of frames cannot be counted during overrun, so conventional retrieval devices must manually perform positioning operations, but according to the present invention, the positioning operation can be performed automatically. This makes it possible to correctly position the film at a high speed, thereby shortening the search time, which is extremely effective in practice.

[Brief explanation of drawings]

Fig. 1 is a front view of the microfilm used in the present invention, Fig. 2 is a main part configuration diagram of a microfilm reader showing one embodiment of the retrieval device of the present invention, Fig. 3 is a control circuit diagram, and Fig. 4 is a microfilm reader. FIG. 7 is a front view showing another example of the film. 1... Microfilm, 14... Piece mark detector, 15... Item mark detector, 33, 34, 3
6...Counter, 35...Subtraction circuit.

Claims (1)

[Claims] 1. A frame mark is attached to each frame in which information is recorded, and a frame mark is attached to the selected frame, and the film is moved in the forward and reverse directions to search for the desired information. In the retrieval device, a first counting means for sequentially adding or subtracting each frame mark on the film according to the film transport direction, and not counting a frame mark detected first after changing the transport direction; a second counting means for sequentially adding or subtracting number marks depending on the film transport direction and not counting the number mark detected first after changing the film transport direction; a film transport means; a storage means for storing the count value of the first counting means when the case number and the count value of the second counting means match; and a storage means for storing the count value of the first counting means; After the count value of the second counting means matches, the film is stopped, and then the film is transported in the opposite direction at a low speed, and when the first frame mark is detected, the film is stopped, and the count value of the first counting means and the storage means are stored. and control means for transporting the film in the opposite direction at a low speed until the stored values match, if the stored values do not match.