JPH01164934A - Information retrieving device - Google Patents

Abstract

PURPOSE:To prevent miscounting and the occurrence of a scratch on an information recording medium caused by the sag of the recording medium occurring when the recording medium is fed by switching from a high speed to a low speed by actuating a driving part for feeding at a low speed in the midst of feeding the recording medium after stopping the driving of a driving part for feeding at a high speed. CONSTITUTION:A motor M for feeding a film has an electromagnetic motor part 18 functioning as the driving part for feeding at a high speed and an ultrasonic motor part 19 functioning as the driving part for feeding at a low speed. The ultrasonic motor part 19 is constituted of a stator part 21, a rotor part 22 which can be connected to the stator part 21 and a magnet part 23, and the rotor part 22 is connected to the rotary shaft 20 of the electromagnetic motor part 18. In case of rotating the rotary shaft 20 at a low speed in the midst of feeding the film at a high speed, the rotation of the motor M is gently changed by actuating the ultrasonic motor part 19 for feeding at a low speed in the midst of feeding the film after stopping the driving of the electromagnetic motor part 18 for feeding at a high speed. Therefore, a microfilm can be prevented from sagging. Thus, the miscounting of retrieval marks on the information recording medium and the scratch caused by the slide of the recording medium can be prevented.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to an information retrieval device for retrieving desired information in an information recording medium such as a microfilm, and in particular, to an information retrieval device for retrieving desired information in an information recording medium such as a microfilm. The present invention relates to an information retrieval device that transports an information recording medium by a motor.

(Prior Art) Conventionally, there is a device of this type as shown in FIG. That is, in this device, the microfilm 100 on which the image is imprinted is placed on the reels 101, 1.
02, these reels lot, 10
2 is driven by a feed motor 103 and a take-up motor 104.

Here, in order to search for a desired image frame on the microfilm 100, the feeder M1 connected to the capstan roller 105 is driven to feed the microfilm 100 in the direction of arrow A1, and the film is The frame mark m1 provided corresponding to each of the 100 image frames is detected by the mark detector 1.
Here, the microfilm 100 is fed by using a cabstan roller 105 connected to the feeding motor M1 and a driven roller 107 that rotates together with the roller 105. In particular, the reel 102 is moved by the take-up motor 1.
04 to feed the microfilm 100, difficulty in stopping the film 100 immediately due to the inertia of the take-up motor 104, and complexity of the take-up motor 104 to prevent these problems. ification.

This is to eliminate problems such as an extension of search time.

By the way, when searching for a desired image in this type of device, the frame number of the desired image may not be clear. In such a case, after feeding the microfilm 100 at high speed with a rough guide, the rotational speed of the feeding motor M1 is significantly reduced to feed the film 100 at a low speed, and the lamp 108 is used to feed the microfilm 100 onto the screen. The user performs so-called skim reading, in which a desired image is searched by visually viewing the projected image.

As the feeding motor M1 for feeding the microfilm 100 at high and low speeds, it is desirable that the rotational speed range is as wide as possible in order to shorten the search time and perform smooth scanning. Therefore, in addition to a device that controls an expensive step motor with a complicated circuit, the feed motor M1 can be controlled by two types, for example, a DC motor and a step motor.
An apparatus is known that is composed of two motors and is configured to feed the film 100 at high and low speeds by switching between the two motors.

Furthermore, we have developed a composite motor that combines an ultrasonic motor that can stably rotate the rotating shaft at an extremely low speed of several rpm by applying a signal from an ultrasonic source to the stator, and a normal electromagnetic motor. Microfilm 1 using
Apparatuses have also been devised that perform high and low speed feeding of 00 and perform desired information retrieval.

(Problem to be Solved by the Invention) However, in such a conventional example, when the speed of the feeding motor M1 is suddenly reduced to perform the above-mentioned skimming, for example, when searching for information, the arrow B1 is moved at high speed. Due to the inertia of the reel lot rotating in the direction, the microfilm 10
0 still tries to advance in the direction of arrow A1 at high speed, and as a result, the film 100 may become slack between the capstan roller 105 and the reel 101.

When such sagging occurs in the microfilm 100, the frame mark m1 provided on the film 100
Because of the vibration, not only does the mark detector 106 miscount (erroneous search), but the films also rub against each other and become scratched, causing problems in that the images become difficult to see.

To solve this problem, microfilm 10
The feeding speed of the film 100 is gradually reduced and stopped once so that no slack occurs in the film 100, and then the feeding speed of the film 100 is
It is conceivable to feed 0 at a low speed, but in that case, a new problem arises in that the search time becomes longer.

On the other hand, it is possible to use one motor with a wide range of rotational speeds and control this motor to reduce the speed so that the film lOO does not sag, but in that case, the number of motors is limited and the motor and control Since the circuit is large and complicated, it leads to an increase in cost.

Therefore, the present invention has been made to solve the above-mentioned problems of the prior art.The purpose of the present invention is to record information when feeding an information recording medium such as a microfilm by switching from high speed to low speed. An object of the present invention is to provide an information [4] device that can prevent miscounts and scratches on an information recording medium caused by sagging of the medium, and can perform accurate and quick information retrieval.

(Means for Solving the Problems) In order to achieve the above object, the present invention includes a drive for feeding an information recording medium composed of a plurality of drive units having different speed ranges, and In an information retrieval device that searches for desired information on an information recording medium by switching between a drive unit and feeding the information recording medium at high and low speeds, when switching the drive in the drive source, the high-speed feeding drive unit The present invention is characterized in that the low-speed feeding drive section is operated during feeding of the information recording medium after the drive is stopped.

(Function) In the present invention having the above configuration, when switching the drive in the drive source that feeds the information recording medium, the low speed feeding is performed while the information recording medium is being fed after the drive of the high speed feeding drive unit is stopped. By operating the feeding drive section, the difference between the supply speed and the feeding speed of the information recording medium is kept very small, and no slack occurs in the information recording medium.

Furthermore, since the information recording medium is not temporarily stopped when switching the drive source, the time required to stop the recording medium and the start-up time required for the recording medium to reach a predetermined low speed are omitted.

Furthermore, the information recording medium can be fed at high and low speeds without using expensive step motors and complicated control circuits.

(Example) The present invention will be described below based on illustrated examples. Second
The figure shows a microfilm reader equipped with an information retrieval device to which the present invention is applied, l is a supply reel rotating in the direction of arrow B, F is a long microfilm as an information recording medium, 3.4 is a guide roller, 5 is microfilm F
6 is a condenser lens, 7.8 is a glass plate placed oppositely across the film transport path, 9 is a projection lens, 10 is a pinch roller, 11 is a capstan roller, 12.13 is a guide roller, 14 is the take-up reel. The supply reel 1 and the take-up reel 14 are connected to film tensioning/winding motors 15 and 16, and the capstan roller 11 is connected to a film feeding motor M as a driving source.

The microfilm F is stretched between the supply reel 1 and the take-up reel 14, and is wound onto the take-up reel 14 or rewound onto the supply reel 1 by driving the capstan roller 11. Here, the take-up reel 14 is the capstan roller 1
When the microfilm F is fed in the unwinding direction, the capstan roller 11 winds the microfilm F of the length fed out onto the supply reel l. It is about to be taken.

Reference numeral 17 denotes a mark detector for detecting counting marks m provided on the sides of each frame of the microfilm F.

The mark detector 17 has a photoelectric conversion element and a lamp, and when the film F is transferred, the light beam from the lamp detects the mark m.
A mark detection signal is emitted by being interrupted by
This mark detection signal is counted by a counter (not shown) of the search device.

FIGS. 1(a) and 1(b) show the motor M for feeding the film.
The electromagnetic motor unit 18 as a high-speed feeding drive unit of this i-tater M is a known DC motor, and the
The rotating shaft 20 can be rotated at 4000 rpm with an applied voltage of 5V. Nao, this. The electromagnetic motor section 18 may be another electromagnetic motor such as an AC motor.On the other hand, the ultrasonic motor section 19 as a low-speed feeding drive section is connected to the stator section 21.
, a rotor section 22 connectable to the stator section 21 , and a magnet section 23 . The rotor section 22 is connected to the rotating shaft 20 of the electromagnetic motor section 18 .

Furthermore, 28 is an annular piezoelectric vibrator made of a composite of, for example, PZT ceramic fine powder and a polymer material, and is fixed on the stator section 21.

FIG. 1(b) shows the electrical connection of the motor M. In the figure, reference numeral 24 denotes an ultrasonic oscillation source that applies an ultrasonic signal of a desired frequency to the piezoelectric vibrator 28 to rotate the rotary shaft 20 at a low speed. It is connected to the. 25 is a variable DC power supply that drives the electromagnetic motor unit 18, and SW2
It is connected to the electromagnetic motor section 18 via. Also, 2
6 is a DC power supply for applying voltage to the magnet section 23, and is connected to the magnet section 23 via a switch SW3. Note that 27 is a load applied to the motor.

FIG. 3 shows the control system of this embodiment.

RLI-RL3 is a relay, and its contacts are shown in Figure 1(b)
This corresponds to the switches SWI to SW3. DL to D3 are diodes connected to each relay RLI to RL3, and have the function of suppressing the back electromotive force of each relay RLI NRL3.
Each relay RLI to RL3 is a transistor Trl to Tr3.
It is connected to each terminal a, b, c of the control circuit 30 via. The control circuit 30 is connected to a timer 31, and based on the clock pulse from the timer 31, it sends a control signal to "rl"r3 and switches the relays RLI to RL3, that is, the switches SWI to optimally rotate the motor M. The SW3 is turned on and off, and 32 is a power source that supplies power to the control circuit 30, motor M, relays RLI to RL3, etc.

In the above configuration, when rotating the rotating shaft 20 at high speed during information retrieval, it is done by driving the electromagnetic motor section 18, that is, by turning on the switch SW2 with a signal from the control circuit 30 and connecting the DC power source 25. The microfilm 100 is fed in the direction of arrow A at high speed by connecting the electromagnetic motor unit 18 and applying a predetermined voltage (24V) to rotate the rotating shaft 20 at about 400 rpm.

On the other hand, when rotating the rotating shaft 20 at a low speed, it is done by driving the ultrasonic motor section 19, that is, by driving the high speed rotation switch SW by a signal from the control circuit 30.
At the same time, the switch SW3 is turned on to apply a predetermined voltage to the magnet part 23. Then, the rotor section 22 is brought into contact with the piezoelectric vibrator 28 connected to the stator section 21 so as to be rotatable together, and the switch SWI is turned on to apply the signal from the ultrasonic oscillation source 24 to the stator section 21 so that the rotor section 22 can rotate together with the piezoelectric vibrator 28 connected to the stator section 21. is rotated at about 4 rpm and the film F is fed at low speed in the direction of the arrow.

The motor M, which is composed of a combination of an electromagnetic motor and an ultrasonic motor, has a wide rotation range, but when feeding the film from a high speed range to a low speed range, switch SW3 is turned ON. If this is done, a brake is applied to the rotating shaft 20, resulting in the following inconvenience. That is, as shown in FIGS. 4(a) and 4(b), the rotary shaft 20, which is rotating at 4000 rpm, is turned on when switch SW2 is turned on at time t.
When FF is turned on and switches SWI and SW3 are turned on at the same time, the rotational speed is suddenly reduced to 4rp■, the reel l that feeds the film F does not immediately decrease its rotational speed due to its inertia and continues to rotate. As the film F is fed, the film F becomes slack, and the mark detector 17 reads the mark m provided on the film F twice, causing a miscount. Furthermore, as the films F become slack, the films F may rub against each other, resulting in scratches on the image surface.

Therefore, in this embodiment, FIGS. 5(a) to (c)
In other words, first, based on the clock pulse from the timer 31, the switch SW2 is turned OFF using a signal sent from the control circuit 30 at time t1, and the electromagnetic motor section IB rotating at the 4000 RP layer is turned off. After stopping the drive, leave it as it is and wait for the rotational speed of the rotational shaft 20 to drop, and at time t3 when the rotational speed of the rotational shaft 20 reaches 4rp which was measured in advance while the film F is being fed, The rotational speed of the stator section 21 of the sonic motor section 19 is 4 rpm t, :"!--The ultrasonic motor section starts at a predetermined time before taking into account the rising time, that is, at time t2 measured by the timer 31. The switches SW1 and SW3 are turned off by a signal from the control circuit 30 to drive the microfilm F. Then, the microfilm F is slowly fed by the motor M rotating at 4 rpm, and the image is scanned on the screen. be able to.

Here, the feeding speed of the microfilm F can be set to any speed.

As described above, after the electromagnetic motor section 18 for high-speed feeding has stopped driving, the ultrasonic motor section 19 for low-speed feeding is operated while the film F is being fed, so that the rotation of the motor M is controlled as shown in FIG. As shown in (C), the gradual change makes it possible to feed the microfilm F at low speed without causing it to sag, which prevents, for example, miscounting of the mark m and scratches on the film F during skimming. obtain. In addition, since the film F is not temporarily stopped when switching the motor M from high speed to low speed, the switching is performed quickly, and so-called waiting time does not become long.
Since there is no need to use an expensive step motor and a complicated control circuit, there are advantages in that the usable motors are not limited and the cost of the device can be reduced.

FIGS. 6(a) and 6(b) show a second embodiment of the information retrieval device according to the present invention, and the same parts as in the first embodiment will be described with the same reference numerals. In this embodiment, the motor M is controlled based on the feeding speed of the microfilm F.
The system is configured to switch from high speed to low speed for skimming, etc. That is, a generator 2 is attached to a guide roller 12 that rotates as the microfilm F is fed.
is connected, and the feeding speed signal of the film F obtained by the generator 2 is sent to the control circuit 30, and ON/OFF of the relays RLI to 3 is controlled based on this signal. Then, at time t1 shown in FIG. 5(C), the driving of the electromagnetic motor section 18 is stopped, and when the feeding speed of the film F has decreased to a value slightly larger than the speed for predetermined scanning, etc., the ultrasonic motor section 19 , and the motor M is smoothly switched as in the previous embodiment. Therefore, in this embodiment, it is possible to prevent miscounts and scratches on the surface of the film 1 due to sagging of the film F when switching the motor M, and also to switch the motor M based on the feeding speed of the film F. , a smoother switching operation can be performed. Here, as the speed detection means for the film F, an encoder may be used in addition to the generator 2.

In each of the above embodiments, after turning off the drive of the electromagnetic motor section 18, the electromagnetic motor section 18 is left for a predetermined period of time to wait for its rotational speed to decrease. In order to shorten the switching time to the drive mode, the brake may be applied by the magnet 23. In other words, after the electromagnetic motor section 1B is driven to 0FFt, a stronger voltage than during low-speed drive is applied to the magnet 23. If the suction force is increased and ultrasonic vibrations are not applied to the stator section 21, the rotor section 22 will be attracted to the stator section 21 and will be prevented from rotating, making it possible to quickly reduce the speed of the rotating shaft 20. This makes it possible to shorten search time.

Further, in each of the embodiments described above, switching the feeding speed of the microfilm F from high speed to low speed was described in the case of so-called browsing (browsing), but the present invention is not limited to this case. For example, it may be applied when the feeding speed of the film F is set in multiple stages.
Therefore, the rotation speed of each motor section 18, 19 can be set arbitrarily.

Further, in the above embodiments, an electromagnetic motor and an ultrasonic motor were used as the high-speed and low-speed feeding drive units; however, the present invention is not limited thereto, and an electromagnetic motor (DC, (AC), pulse motor, etc. may be used; however, for continuous reading, it is preferable to use an ultrasonic motor due to its output characteristics, and for high-speed feeding of film F, it is preferable to use an electromagnetic motor due to its economical efficiency. .

(Effects of the Invention) In the present invention having the above configuration and operation, when switching the drive in the drive source that feeds the information recording medium,
By operating the low-speed feeding drive while feeding the information recording medium after the high-speed feeding drive has stopped driving, the feeding speed of the information recording medium can be smoothly changed. Sagging of the information recording medium can be prevented. As a result, it is possible to prevent miscounting of search marks on the information recording medium and scratches caused by the rubbing of the recording medium, thereby making it possible to perform accurate information retrieval.

Further, since the information recording medium is not temporarily stopped when switching the drive source, the switching is performed quickly and so-called waiting time does not become long.

Further, since there is no need to use an expensive step motor or a complicated control circuit, there are various effects such as the fact that the motors that can be used are not limited and the cost of the device can be reduced.

[Brief explanation of the drawing]

FIGS. 1(a) and 1(b) show a microfilm feeding motor applied to the first embodiment of the information retrieval device according to the present invention, and FIG. 1(a) is a longitudinal sectional view, Same figure (
b) is a circuit diagram showing electrical connections, FIG. 2 is a schematic configuration diagram showing the overall configuration of the same embodiment, FIG. 3 is a block diagram showing the control system of this embodiment, and FIGS. 4(a), ( b) shows the control state when switching continuously from the electromagnetic motor section to the ultrasonic motor section; FIG. The time charts showing OFF, FIGS. 5(a) to 5(c), show the control state when switching the motor drive in the same embodiment, and FIG. 5(a) shows the case when the electromagnetic motor drive is stopped. A graph showing the attenuation of the rotational speed of the switch, (b) is a time chart showing the ON-OFF state of the switch, and (c)
) is a graph showing the rotational speed of the motor, Figure 6(a),
(b) shows a second embodiment of the information recording device according to the present invention, (a) is a schematic configuration diagram showing the overall configuration, (b) is a block diagram showing the control system, FIG. 7 is a schematic configuration diagram showing the overall configuration of a conventional information recording device. Explanation of symbols 18... Electromagnetic motor section (high-speed feeding drive section) 19...
・Ultrasonic motor section (low-speed feeding drive section) F...Micro film (information recording medium) M...Motor (drive source) Fig. 1 ((11 1st f1))

Claims (2)

[Claims] (1) A drive source for feeding an information recording medium consisting of a plurality of drive units having different speed ranges is provided, and the information recording medium is fed at high and low speeds by switching between the plurality of drive units. In an information retrieval device that searches for desired information on a recording medium, when switching the drive in the drive source, after the drive of the high-speed feed drive unit is stopped, the low-speed feed drive unit is activated while the information recording medium is being fed. An information retrieval device characterized by: (2) The information retrieval device according to claim 1, wherein the high-speed feeding drive section is an electromagnetic motor, and the low-speed feeding drive section is an ultrasonic drive motor.