JPS59160270A - Information retrieving device - Google Patents

Abstract

PURPOSE:To prevent an erroneous retrieving operation even if a vibration of a film is generated by providing at least three mark detectors for detecting successively a mark. CONSTITUTION:Each waveform shaping circuit 35-38 outputs a signal of a high level when each connected sensor detects a mark, and outputs a signal of a low level when the mark is not detected. When a signal of a high level is inputted to a set side input terminal S, a flip-flop 40 is set at the time of rise of its signal, and when a signal of a high level is inputted to a reset side input terminal R, the flip-flop 40 is reset at the time of rise of its signal.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides information on information supports such as films! The present invention relates to an information retrieval device that detects errors and retrieves desired information.

Generally, when searching for images on film, a counting mark placed on the side of each image is counted, and when the counted value matches the address of the desired image, the film feeding device is stopped. I have to.

If the feeding speed of the film is increased by the feeding device in order to increase the search speed, it is difficult to stop the film at the target address due to the inertia of the feeding device. Therefore, reduce the feeding device from high speed to low speed at the address in front of the target address, and make sure to stop at the target address.
Was. However, when lowering the feeder from high speed to low speed,
There is a problem in that a phenomenon in which the film moves in the opposite direction to the film feeding direction due to the inertia of the film reel, ie, pack lash, occurs, resulting in an extra mark being counted and an incorrect search operation.

Another search method is to feed the film at high speed to the desired address, command the film to stop at the desired address, allow the film to overrun from this position, then stop, and then redirect the film by the overrun amount. A method is used in which the target address is fed at low speed in the opposite direction to ensure that it stops at the target address. However, in this case, when the film is abruptly stopped from high speed, the film is vibrated L1 in the film feeding direction by the pack lashing machine, etc. This causes the same mark to be counted twice or more, resulting in an incorrect search operation. It will be done.

SUMMARY OF THE INVENTION An object of the present invention is to provide an information retrieval device that does not perform erroneous retrieval operations even when film vibration occurs.

The details of the present invention will be described below with reference to the drawings.

FIG. 1 shows a film reader having a retrieval device according to the invention. In the figure, 1 is a supply reel, 2.
3 is a guide roller, 4 is a lamp that illuminates the microfilm, 5 is a condensing lens, 6 and 5 are glass plates placed opposite each other across the film transport path, 8 is a capstan roller, 9 is a pinch roller, and 10 is a winder. It is a take reel. supply reel l
The take-up reel 10 is connected to a film tensioning and winding motor, and the capstan roller 8 is connected to a film drive motor.

The microfilm r is stretched between a supply reel l and a take-up reel 10, and is wound onto the take-up reel or rewound onto the supply reel by driving the capstan roller 8.

11 is a mark detector, 12 is a projection lens, and 13 is a screen.

The microfilm F is illuminated by light from the lamp 4 between the glass plates 6 and 7, and images of the illuminated frames are projected onto the screen 13.

FIG. 2 shows the mark detector 11. The mark detector has four photoelectric conversion elements (hereinafter referred to as sensors), and each sensor is arranged at a predetermined distance in the transport direction of the film F. It is configured to sequentially detect marks M on the film.

The mark M is recorded on the side of each frame on the film, has a different density from the base part, and is a transparent mark in this embodiment. Of course, opaque marks can also be used.

The distance between the first sensor 20A and the second sensor 20B and the distance between the second sensor 20B and the third sensor 200 are determined based on the amount of vibration of the film that occurs when the film feeding speed is suddenly decreased or when the film is stopped. It is set to increase in size. The fourth sensor 20D is the second sensor 2
This sensor is located near 0B and is used to accurately stop the film at a predetermined position, and can be omitted if it is not necessary to stop the film accurately.

When the light incident on the sensor is interrupted by the opaque mark M, the sensor detects the mark and outputs a high level signal. In FIG. 2, when the film 7 moves from left to right, the sensor 20A
Output pulse signals in the order of 20B-20D・200,
When moving from right to left, pulse signals are output in the reverse order.

Note that the optical signal from the mark may be received by a sensor via an optical member such as an optical fiber or a mirror. - 38 are waveform shaping circuits, 40 is a flip-flop, 41 micro combinators, 42 is an AND gate, 43 is an inverter, and 44 is an OR gate. Each of the waveform shaping circuits 35 to 38 outputs a high level signal when the connected sensor detects a mark, and outputs a low level signal when no mark is detected. The flip-flop 40 is set when a high-level signal is input to the set-side input terminal S, and the rising edge of the signal is .
Further, when a high-level signal is input to the reset side input terminal H, the rise of the signal is reset at the time of hitting.

Note that the details of the search device are well known and will not be described here.

FIG. 4 explains the state in which each sensor detects a mark and the output of each sensor.

Now, in Fig. 4, if the film is fed in the direction of the arrow, in the state of (a) in Fig. 4, each sensor
20D does not detect mark V, and the output of each sensor is "0".
”. Next, in the state (b), when the first wide sensor 2OA detects the mark M, the output of the second sensor 2OA becomes "1". At this time, other sensor 20BN2
Since 0D does not detect a mark, the output is "0". When the first sensor 2OA detects the mark M, a high level signal is output from the waveform shaping circuit 35, and the flip-flop 40 is reset by this signal.

Next, in the state (c), when the second sensor 20B detects the mark M, the output of the second sensor becomes "1".
A high level signal is output from the waveform shaping circuit 36. At this time, the fourth sensor 20D does not detect the mark M, so
The AND gate 42 opens, and the gate signal of the sieve level output from the AND gate 42 causes the flip-flop 4 to open.
0 is set. A high-level pulse signal is output from the ct output terminal by setting the flip-flop 40, and this pulse signal is sent to the conbeater 41 as a mark detection signal, and is counted by addition or subtraction in the counting section of the conbeater.

When the film is further fed and reaches the state shown in Figure 4), the fourth sensor 20D detects the mark M, and then (H).
When the state is reached, the third sensor 20() detects the mark M, and at this time, the output of the third sensor 200 becomes rlJ, thereby resetting the shift flip-flop 40.

After the next state is reached, the next mark on the film reaches the detection position of the first sensor 20A.

Therefore, each mark on the film is detected by the mark detector 11.
When passing through the detection position, a mark detection signal is output from the flip-flop 40 every time the relative positional relationship between the mark and the sensor becomes C, and the count value of the counter matches the frame number of the desired information. At this time, a stop signal is issued from the combiator 41, the capstan roller 8 is stopped, and the relationship between the mark of the desired information frame and the sensor becomes the state (c), and the film stops.

Changing the film speed during microfilm feeding b
1 When the film is stopped, even if the film vibrates in the advancing direction in the state shown in Figure 4 e, the first and third sensors are outside the vibration range of the mark, and the clip-flop 40 is always in the set state. Therefore, the mark detection detector does not output the same mark more than once, and erroneous counting is prevented and erroneous information is no longer searched.

Figure 4 (c) also occurs when the film is fed in the opposite direction to that described above.
When the mark detection signal is output in the state of , and when the mark of the desired information frame is detected (, -→ state, the film stops. Therefore, regardless of the film feeding direction, the stop position of the frame is This is always constant, so that when desired information is retrieved and the film is stopped, this information can be RK projected at a predetermined position on the screen.

Further, even if the film feeding direction is reversed at any time, the count value and the new address always match, so there is no risk of erroneous retrieval.

In addition, as a film, a film having a mark long enough to be detected simultaneously by two or more sensors, that is, a mark having a shape longer than mark M in the film feeding direction, is used. You can perform the correct search operation in the same way as .

As described above, according to the present invention, the information support body is
Lol! Even if the feeding direction is changed, no erroneous counting occurs, and desired information can be accurately retrieved. Also, even when the feeding direction is changed, no erroneous counting occurs.

[Brief explanation of drawings]

FIG. 2 is a block diagram of the mark detector, FIG. 3 is a control circuit diagram of the search device, and FIG. 4 is a diagram explaining the mark detection state and the output of each sensor. 20A ~ 20D ------1= / Sir, 40-
---7 lip 7p tube. Applicant: Canon Corporation? OA ZOB ZOD? OCo
o o. 1 0 0 0 0 1 0 00
0 1 00 0 0
1 0 0 Q Q461-

Claims (1)

[Claims] providing at least three mark detectors for sequentially detecting marks on the moving information carrier, resetting the flip-flop when the first mark detector or the third mark detector detects a mark; After the first mark detector or the third mark detector detects a mark, when the second mark detector detects a mark, a flip-flop is set to output a mark detection signal, and this mark detection signal is counted. An information retrieval device that retrieves desired information by searching for desired information.