JPH01309036A - Information retrieving device - Google Patents

Abstract

PURPOSE:To shorten a traveling distance where an information recording medium is carried at a low speed to prevent its cutting and to shorten retrieval time by altering the carrying speed of the information recording medium according to the interval of marks and changing a value of a coil diameter generating a trailing edge detecting signal according to the carrying speed. CONSTITUTION:The title device is provided with a speed changing means 48 which measures the interval of marks given to the information recording medium and changes the carrying speed of the information recording medium based on the measured interval, and a coil diameter detecting means 75 controlling the generation of the trailing edge detecting signal for the information recording medium. Namely, in response to the interval of the marks, the carrying speed of the information recording medium is changed and the coil diameter for detecting the trailing edge is altered according to said speed. If the carrying speed is high, it is slowed down with a comparatively large coil diameter, whereas if the speed is low, the trailing edge signal is generated with a comparatively small coil diameter to switch to a low speed. As a result, the traveling distance where the recording medium is carried at a low speed to prevent its cutting, and retrieval time can be shortened.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention is used, for example, in a microfilm reader, and can automatically read desired information on an information recording medium such as film by detecting marks on the recording medium. The present invention relates to an information retrieval device for searching.

(Prior Art) Conventionally, search devices built into film readers and the like use a film in which a search mark is provided on the side of each frame of the film, and this mark is optically detected.
By counting this, a desired frame in the film is automatically searched.

The above search device illuminates the mark on the film with a lamp,
A mark detector detects changes in the light blocked by marks when the film is moved, and a counter counts the output signal of this mark detector. The comparison circuit compares the frame number of the frame with the frame number, and when the two match, the comparison circuit issues a stop signal to the drive control circuit, which stops the drive system that transports the film and projects the desired frame onto the screen. It is designed to remain stationary in a predetermined position. By the way, if the frame number entered from the keyboard etc. is incorrect,
Since the transferred film passes the last frame and its terminal end is fixed to the reel frame, there is a possibility that the film terminal end is pulled by the fixed part at high speed and cut.

In contrast, in the past, the end of the film was detected by detecting the winding diameter near the end, changing the speed to a low speed when the film became below a certain amount, and then positioning the film at the end.

(Problem to be solved by the invention) However, in the conventional example described above, there is no problem when the conveyance speed is the same, but if the conveyance speed differs due to search conditions etc., the time until the speed decreases changes, and the conveyance speed changes between medium speed and low speed. When the speed is lowered to 1, the speed changes relatively quickly, which causes the problem that the distance traveled after the speed is reduced becomes longer and the search time becomes longer.

By the way, films used in projection devices such as film readers or film reader printers include a film 2 on which an image L is recorded in one row as shown in FIG. 0m, where there is a film 4 where 3 is recorded in two rows, is a search mark provided on the side of each image. Film 4 is called a duo film, in which images are taken on one side of the film in order from the leading edge of the film, and once the images have been taken on one side, the film is loaded in reverse, and images are taken on the other side of the film in order from the trailing edge. It is produced by a so-called reciprocating photographing method.

In Figure 6, the left side is the leading edge of the film, and the right side is the trailing edge of the film.
In reality, numbers are not recorded in this way, but for convenience of explanation, a number was assigned to each image. A search mark m is recorded on the side. by the way,
Duo film generally has a high photographic reduction ratio, so the intervals between the search marks are narrow, but the intervals between the marks of the general film shown in FIG. 6 are relatively wide.

However, in the case of such conventional technology, the upper limit of the film transport speed in the information retrieval device is determined by the speed at which search marks are detected and calculated, and when the film transport speed is set to match the duo film in which the marks are narrowly spaced. As shown in FIG. 6, if a search is performed using a film with long search mark intervals at the transport speed described above, the transport speed will not match the film, even though the search speed can be made faster. There was a problem that the search speed was slow because of the number of users.

Therefore, the present invention has been made to solve the above-mentioned problems of the prior art, and its purpose is to shorten as much as possible the traveling distance at low speed to prevent cutting of the information recording medium, An object of the present invention is to provide an information retrieval device that reduces retrieval time.

(Means for Solving the Problems) In order to achieve the above object, in the present invention, information recording media are transported and marks attached to the transported information recording media are counted by a counting means. In an information retrieval device that searches for desired information in an information recording medium, a speed changing means that measures a mark interval on the information recording medium and changes the transport speed of the information recording medium based on the measured value;
and winding diameter detection means for controlling generation of the end detection signal of the information recording medium in accordance with the transfer speed.

(Function) In the present invention having the above configuration, the transfer speed of the information recording medium is changed according to the interval between marks, and the end detection winding diameter is also changed in accordance with this transfer speed, so that the transfer speed is fast. When the speed is low, a relatively large winding diameter is used to terminate the winding and the speed is changed to a low speed, and when the speed is low, a relatively small winding diameter is used to generate a terminal signal to change the speed to a low speed.

(Example) The present invention will be explained below based on the illustrated example. Second
The figure and FIG. 3 show a microfilm reader to which the information retrieval device of the present invention is applied. In the figure, 11
12 and 13 are supply reels, 12 and 13 are kite rollers, 14 are lamps that illuminate the microfilm 4 supplied from the supply reel 11, 15 are condensing lenses, and 16 and 17 are transparent glasses placed opposite each other across the film movement path. 18 is a capstan roller, 19 is a pinch roller, 20 is a winding auto-reel, and 20 is connected to a film tensioning/winding motor (not shown), and the capstan roller 18 is connected to a film feeding motor (film tensioning/winding motor). The torque is greater than that of the take-up motor).

The microfilm 4 as an information recording medium is a duo film shown in FIG. or rewound onto the supply reel 11.

Further, as shown in FIG. 5, a rotary encoder plate 71 having a number of square holes 71a is attached to the rear end of the shaft 73 of the supply reel 11 through a flange 70, and the square holes 71a pass through a photointerrupter 72. By counting the encoder pulse signals generated when the film 4 is fed by a certain amount.

The winding diameter of the film 4 is obtained. To measure whether the film 4 is fed by a certain amount, a similar rotary encoder plate may be attached to the capstan roller 18, and the number of pulses may be measured when the film is transferred.

Further, 21 and 22 are mark detectors, 23 are projection lenses, and 2
4 is a first reflecting mirror, 25 is a second reflecting mirror, and 26 is a screen. The projection lens 23, mirrors 24, 25 and screen 26 are arranged at fixed positions. The microfilm 4 is then illuminated by the lamp 14, and the light beam that has passed through the microfilm 4 passes through the lens 23.
The light is reflected by reflection mirrors 24 and 25 toward a screen 26, and the illuminated film image is enlarged and projected onto the screen 26. Further, 30 is a film holding stand, which includes the above-mentioned supply reel ll, gaitronilla 12, 13. Glass plate 16,1
7. It holds the capstan roller 18, pinch roller 19, take-up auto-reel 20, mark detectors 21, 22, etc.

On the other hand, 27 is an initial load cab stand. When the autoload switch is pressed for the first time, an initial motor (not shown) rotates, pulls out the leading end of the film wound around the supply tube 11, and moves it along the guide 28. Feed it to the capstan roller 18. Furthermore, capstan roller 18
The film is advanced by driving and is wound on the take-up auto-reel 20.

The first mark detector 21 detects the mark m provided on the side of the first row of images on the microfilm 4.

The second mark detector 22 detects the mark m provided on the side of the second row of images on the microfilm 4.

Each mark detector 21, 22 has a photoelectric conversion element and outputs a high-level mark detection signal when receiving an optical signal from a mark, and is made of a known type.

FIG. 1 shows a search device applied to the reader, in which 40 is a keyboard for inputting the search number (frame number) of a desired image, 41 is a memory circuit for storing the search number entered on the keyboard, and 42 is a memory circuit for storing the search number input into the keyboard. 1 mark detector 21 and the second
This is an addition/subtraction counter serving as a counting means for adding or subtracting the mark detection signal output from the mark detector 22. The counter 42 adds and counts mark detection signals when it is in an addition state, and subtracts and counts mark detection signals when it is in a subtraction state. 43 is a comparison circuit that compares the content A of the counter 42 and the content B of the memory circuit 41, calculates A-B=C, and outputs a signal indicating the film feeding direction depending on the sign or negative of the subtracted value C; Also, when the contents of the two match, that is, the count value A of the counter 42 and the search number B stored in the storage circuit 41.
When they match (A-B=C=0), a film stop signal is output. Reference numeral 49 denotes a manually operated mode changeover switch, and the mode is set according to the type of mark on the film used. When using film 2 in Fig. 6, it is set to mode A, and when using film 4 in Fig. 7, it is set to mode A. When used, it is set to mode B. When switched to mode A, a low level signal is always output from the output terminal 54 of the comparison circuit 43, a high level signal is always output from the output terminal 53, and mode B is set. When set to , a high level signal is selectively output from the output terminal 53 or 54.

45 is a trailing edge detector that detects that the rearmost image (image number r2000J, "2001" in FIG. 7) on the microfilm 4 has passed through the mark detection position and has been sent to the take-up reel 20. .

FIG. 4 shows an example of the trailing edge detector 45, in which the intervals between the marks m attached to each frame of the microfilm 4 are constant, and the mark detection signal outputted when this mark is detected is constant. A timer 46 is provided which operates at a time interval longer than the time interval of the mark detection signal when the film is running at a predetermined speed, and the mark detector 21 or 22 is detected at a desired interval while the film is being fed.
While the mark detection signal is being output from the timer 46, the timer 46 is reset, and if the mark detection signal is not generated from the mark detector before the set time of the timer 46 has elapsed, the timer 46 outputs a high level trailing edge detection signal. A known timer can be used. 44 is the or gate.

In FIG. 1, reference numeral 61 denotes an auto-load switch. At the start of use, in order to take up the film from the supply reel 11 and stretch it onto the auto-reel 20, the initial motor drive circuit 62 is activated to rotate the initial load capstan 27, and the film is moved to the capstan roller 18. After reaching this point, the capstan roller 18 winds it around the take-up autoreel 20. The rotational speed V of the capstan motor is sent to the mark interval counting circuit 63, and the mark interval counting circuit 63 calculates the film transport speed V from V-v, which can be calculated from the time interval t of the output signal from the counter 42 and the motor rotational speed V. Measure the mark interval with . This result is then sent to a transfer control circuit 48 serving as speed changing means to change the film transfer speed.

The transfer control circuit 48 controls the film transfer motor that drives the capstan roller 18, and stops the motor when a film stop signal is input from the output terminal 60 of the comparison circuit 43, and when a reverse rotation signal is input from the transfer direction conversion circuit 47. When this happens, stop the motor and then reverse it. The film stop signal outputted from the comparison circuit 43 operates a brake device (not shown) to prevent the capstan roller 18 from rotating.

The transfer control circuit 48 controls the motor to transfer at a lower speed when the mark interval is relatively short, and at a higher speed when the mark interval is relatively long. Note that 47 is a feeding direction changing circuit that outputs a reverse rotation signal when receiving a rear end detection signal from the rear end detector 45.

On the other hand, G1, G2...G6 are AND gates, and OR1, OR2, OR3 are t7 gates.

anime) G1. G2 is the output terminal 53 of the comparison circuit 43
．． 54, and selectively sends the output signal of one of the mark detectors 21 and 22 to the counter 42.

AND gates G3 to G6 output signals that control the addition and subtraction of the counter 42.

A signal indicating the feeding direction of the film is input to the signal lines 51 and 52, and when the microfilm 4 is being fed in the direction in which it is wound onto the winding wheel 30 (hereinafter referred to as the forward direction), a signal indicating the feeding direction of the film is input to the signal line 51. If a high-level forward feed signal is sent and the microfilm 4 is fed in the direction in which it is rewound onto the supply reel 11 (hereinafter referred to as the reverse direction), the signal line 52
A high level reverse feed signal is sent to The forward and reverse feed signals can be obtained, for example, by using a feed signal output from the comparator circuit 43 or by detecting the rotational direction of the motor that drives the capstan roller 18.

AND gate G3 opens when a high level signal is input from the output terminal 53 of the comparison circuit 43 and a forward feed signal is input from the signal line 51, and outputs an addition signal. When a high level signal is input from the output terminal 53 and a reverse feed signal is input from the signal line 52, it opens and outputs a subtraction signal. Further, the AND gate G5 outputs an addition signal when a high level signal is input from the output terminal 54 of the comparison circuit 43 and the reverse feed signal is input manually, and the AND gate G6 outputs an addition signal from the output terminal 54 of the comparison circuit 43. When a high level signal is input and a forward feed signal is input, a subtraction signal is output. The counter 42 is switched to the addition state by the addition signal, and switched to the subtraction state by the subtraction signal. Counter 42
When searching for images in the first row of microfilm, if the microfilm is fed in the forward direction, it will be in the addition state, if it is fed in the reverse direction, it will be in the subtraction state, and it will be in the subtraction state if the microfilm is being fed in the forward direction. When searching for images in the second column, if the microfilm is being fed in the reverse direction, the microfilm is in the addition state, and if it is being fed in the forward direction, it is in the subtraction state.

Further, by comparing the number of pulses from the photointerrupter 72 and the number of pulses from the capstan encoder 74, the supply side winding diameter is calculated by a winding diameter detection circuit 75 serving as a winding diameter detection means. Then, the winding diameter for changing the final speed is determined in accordance with the transfer speed, and when the desired winding diameter is reached, a speed change signal is sent out to switch to a low speed.

Next, I will explain the operation of the above device. Now, when the film 2 shown in FIG. 6 is used, the mode changeover switch 49
is set to mode A. Further, the output terminal 53 of the comparison circuit 43 is at a high level, and the output terminal 54 is at a low level. In this state, only the mark detection signal output from the first mark detector 21 is sent to the counter through the analogue G+. Here auto load switch 6
When 1 is pressed, the initial motor drive circuit 62 operates,
The initial motor (not shown) rotates.

The initial load capstan 27 rotates, unwinds the film 4 from the supply reel 11, and when the film that is fed along the guide 28 reaches the capstan roller 18, it is continuously fed by the capstan roller 18 at a constant speed for one roll. It is taken and wound onto auto reel 2. The initial motor stops when the film is gripped by the capstan roller 18. After the film is wound, it is fed at the same speed, and when the mark m on the film enters the counter 42 through the first mark detector 21, this signal is sent to the mark interval measuring circuit 63. When signals corresponding to a predetermined number of frames N are input to the mark interval measuring circuit 63, each mark interval can be counted based on the speed information of the capstan roller 18 from the transfer control circuit and the mark detection time information. The average mark interval is calculated by arithmetic averaging the mark intervals, and the transport speed is determined based on this value. If the mark interval value is relatively long, the transport speed is set high, and if the mark interval value is relatively short, the transport speed is set low. This actual set value differs depending on the control method. This film is set at a relatively high speed. At the same time, the film stops, 1 is automatically set on the memory circuit 41, a reverse rotation signal is generated, the film is advanced to the first frame, and then stopped. Next, in the setting state of mode A, when the search number B (>1) of the desired image on the microfilm 2 is inputted into the keyboard 40, since 1-B=C<0, a forward feed signal is output from the comparison circuit 43. The film transport motor is driven via the transport control circuit 48, and the microfilm 4 is transported in the direction in which it is wound onto the winding auto-reel 20. While the film is running, the AND gate G3 is opened and the counter 42 enters the addition state, and the AND gate GI is opened and the mark detection signal output from the first mark detector 21 is added and counted by the counter 42. When the count value and the search number stored in the storage circuit 41 match, the comparison circuit 43 outputs a film stop signal. This stop signal causes the film transport motor to stop, the film to stop, a desired image to be placed at the photographing position, and this image to be projected onto the screen 26, thus completing the search operation.

By the way, if you key in the wrong frame number (large number) when using this keyboard with 40 manual inputs, the film will be transported at high speed, the winding diameter detection circuit 74 will generate an end signal when the winding diameter is relatively large, and the speed will be slowed down. is lowered. Further, the film is fed until the film is completely on the supply reel 1.
When the film is unwound from the photo interrupter 72.1, the film stops at that position because the end of the film is fixed to the reel shaft. Capstan roller encoder 74
In both cases, no signal is generated, it is assumed that the end is complete, and film transport is stopped.

Next, when the duo film 4 shown in FIG. 7 is used, the mode changeover switch 49 is set to mode B. Further, the output terminal 53 of the comparison circuit 43 is at a high level, and the output terminal 54 is at a low level.

Autoloading is performed by the same operation as in the previous embodiment, and the mark interval is measured. The calculation result in this case is that since the mark interval is short, the transport speed is set to a relatively low speed, and the first frame is similarly projected.

In the setting state of mode B, the search number B'(>
If you input 1).

Since 1-B'=c<o, a forward feed signal is output from the comparison circuit 43, the film transfer motor is driven via the transfer control circuit 48, and the microfilm 4 is wound in the direction in which it is wound onto the take-up auto-reel 20. will be sent to While the film is running, the counter (G3) is opened and the counter 42 is in the adding state, and the counter (G+) is opened and the first mark detector 21 is activated.
Mark detection signals outputted from the counter 42 are added and counted by a counter 42. When the rearmost image of the first row of the film (image number r2000J in FIG. 7) passes the detection position of the mark detector 21, a trailing edge detection signal is output from the trailing edge detector 45, and this signal causes the film to be moved. The motor stops and the film stops. Next, a reversal signal is output from the transfer direction changing circuit 47, and this reversal signal causes the transfer control circuit 284 to
8, the film transport motor is reversed, and the microfilm 4 is fed in the reverse direction. At the same time, the same signal is sent from the feed direction changing circuit 47 to the comparison circuit 43, so that the output terminal 53 becomes low level and the output terminal 54 becomes high level.

After this, while the film is running, the AND gate G5 is opened and the counter 42 enters the addition state, and the AND gate G2 is opened and the mark detection signal output from the second mark detector 22 is added and counted by the counter 42. . During reverse movement, when the count value of the counter 42 and the search number stored in the storage circuit 41 match, a stop signal is output from the comparison circuit 43. This stop signal causes the film transport motor to stop, the film to stop, the desired image to be placed at the projection position, this image to be projected onto the screen 26, and the search operation is completed.

Next, from this state, input the search number of the desired image in the first column into the keyboard to start the search. After the microfilm is fed in the forward direction, when the trailing edge detector 45 detects the trailing edge. After a temporary stop, the microfilm is fed in the reverse direction, and when the first mark detector 21 detects the search mark corresponding to the desired image, a stop signal is output from the comparison circuit 43, and the film is stopped. Then, the desired image is retrieved.

At this time, if the film trailing edge detection is not activated, or if a film that is not Duo but has a relatively narrow frame interval is used, the film is being transported at a relatively low speed.
A termination signal is generated from the winding diameter detection circuit 74 when the winding diameter is small and relatively close to the end, and the speed is slowed down. The process is the same as Film 2 until the film stops after the speed changes to low speed.

Further, the film transport speed in each mode is set to the maximum speed at which marks can be detected and calculated for each mark interval, depending on the mark interval on the film used.

As described above, in this embodiment, by changing the winding diameter for detecting the end of the film in accordance with the film transport speed, the time for low-speed running that does not cause the film to be cut can be minimized, so that the total search time can be shortened.

In the above embodiment, optimal termination processing control is performed by changing the value of the supply side winding diameter at which the termination signal should be generated in accordance with the transfer speed obtained by measurement at the time of initial loading. Unlike the example, the end detection signal is always generated at a constant value of the supply winding diameter, and instead of changing from high speed to low speed using this signal, the speed is changed sequentially from high speed → medium speed → low speed, and this medium speed A similar effect can be obtained by controlling the speed in accordance with the original transfer speed.

In addition, it not only performs calculations using the signal at the time of initial loading, changes the maximum speed setting of the transfer speed, and at the same time changes the generation timing of the end detection signal in accordance with the speed, but also changes the generation timing of the end detection signal in accordance with the supply side winding diameter. In accordance with the film transport speed that is actually being transported, the timing at which the end detection signal is generated may be controlled so that it occurs at the time when the supply side winding matches the transport speed.

(Effects of the Invention) As described above, the present invention changes the transport speed of the information recording medium according to the interval between marks, and further changes the winding diameter value for generating the end detection signal in accordance with this transport speed. The travel distance at low speeds to prevent the information recording medium from being cut can be shortened as much as possible, the search time can be shortened, and the search work can be carried out at a high efficiency.

[Brief explanation of the drawing]

FIG. 1 is a circuit configuration diagram of a search device according to an embodiment of the present invention, FIG. 2 is a schematic configuration diagram of a search device showing an embodiment of the present invention, and FIG. 3 is an application of the search device shown in FIG. 1. 4 is a configuration diagram showing an embodiment of the rear end detector, FIG. 5 is a perspective view of an encoder used in the retrieval device of the same embodiment, and FIGS. 6 and 7 are It is a front view of a microfilm. Explanation of codes 2.4... Microfilm (information recording medium) 21.
22... 1st. Second mark detector 42...counter (
Counting means) 63... Mark interval measuring circuit 48... Transfer control circuit (speed changing means) 75... Winding diameter detection circuit

Claims (1)

[Scope of Claims] An information retrieval device that searches for desired information in the information recording medium by transporting the information recording medium and counting marks attached to the transported information recording medium using a counting means, comprising: a speed changing means that measures the mark interval on the recording medium and changes the transfer speed of the information recording medium based on the measured value; and a winding diameter detector that controls generation of an end detection signal of the information recording medium in accordance with the transfer speed. An information retrieval device characterized by comprising: means.