JPS60252334A - Information retrieving device - Google Patents

Abstract

PURPOSE:To stop correctly desired information in a prescribed position by feeding always a recording medium in a certain direction even if the recording medium is fed in any direction, and stopping it thereafter when a mark detecting means detects the mark of desired information. CONSTITUTION:When an address number n of a present retrieved frame is smaller than an address number N' of a desired frame to be next retrieved, a motor 11 is driven, and a film F is fed forward, and the motor 11 is stopped to stop the film F in a prescribed position when the counted value of a counting circuit reaches N'. Meanwhile, when the address number N is larger then the address number N', a motor 5 is driven, and the film F is fed in the reverse direction to retrieve a frame of an address number N'-1, and thereafter, the film is fed forward, and the film is stopped to terminate the retrieving operation when the frame of the address number N' is retrieved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an information retrieval device that searches for desired information in a recording medium by detecting marks on a recording medium such as a film on which information and marks are recorded.

[Background and purpose of the invention]

Generally, when searching for desired information on a long film, a search mark with a different density from the surrounding area is set for each frame of the film, and when the film is fed, the mark is Desired information is searched by comparing the count value with the address number of the desired information frame to be searched.

The film is wound on a pair of reels, and when a motor connected to the first reel is driven, the film is sent from the first reel to a second reel and wound on the second reel.
This motor stops when the desired frame mark is detected. On the other hand, when the motor connected to the second reel is driven, the film is fed from the second reel to the first reel and rewound onto the first reel, and when the desired frame mark is detected, this motor is activated. Stop. The film is rewound onto the first reel or onto the second reel depending on whether the desired frame to be searched for is in front of or behind the frame currently being searched. However, when the mark detector detects the mark of the desired frame and the motor is stopped to stop the film, the desired frame stops at a different position due to differences in the performance of both motors, and the film is There is a problem in that depending on the feeding direction, the film cannot be correctly stopped at a predetermined position.

It is difficult to accurately match the performance of the drive systems of both motors, and there is a problem that the structure becomes complicated.

The present invention aims to solve the problem described in 1. Before ending the search operation, the recording medium is always fed in a fixed direction and then stopped when the mark detection means detects a mark of desired information. The present invention is characterized in that the recording medium feeding means is controlled in this way.

Hereinafter, the present invention will be explained with reference to the drawings.

〔Example〕

FIG. 1 shows a film reader equipped with a retrieval device of the present invention, where l indicates a frame f and a mark m on which image information is recorded.
2 is a microswitch that detects that the cartridge L is installed in a predetermined position of the film reader; 3 is a removable film supply cartridge that stores the microfilm F in the cartridge L; capstan roller for feeding,
4 is a film feeding motor that rotates the capstan roller 3; 5 is a film rewinding motor that rotates a film spool in the cartridge; 6 is a motor that moves the capstan roller 3 to a position where it contacts the microfilm F and from the microfilm. This is a solenoid that moves it away.

7,... 7. 8 is a film guide roller, 8 is a film take-up reel, and 9 is applied pressure toward the center of the take-up shaft of the take-up reel 8 by a spring IO to ensure that the leading edge of the film is firmly attached to the take-up shaft of the take-up reel 8. It is a guide roller for winding.

Reference numeral 11 denotes a buoy (Vum) winding motor for rotating the winding reel 8. Although not shown, a guide plate is provided for guiding the film along a predetermined film feeding path between the cartridge 8 and the take-up reel.

In the above configuration, when the motor 4 is driven and the solenoid 6 is activated, the capstan roller 3 rotates and moves to a position where it contacts the microfilm F, and the contact between the capstan roller 3 and the microfilm causes the film to be removed from the cartridge 1. The leading end of the film F is fed out, and the film F is fed toward the take-up reel 8 along a predetermined path.

When the leading edge of the film passes through the quadrature rough □, a film detector (not shown) detects the microfilm, and this detection signal drives the motor 11, causing the take-up reel 8 to rotate.

When the leading edge of the film F is fed to the take-up reel 8, the leading edge of the film is moved to the take-up reel 8 by the action of the kite roller 9.
The winder automatically winds the winder onto the winder's winding shaft. Film F is on take-up reel 8
When the motor 4 and solenoid 6 become inoperative,
The capstan roller 3 separates from the film and returns to its original position. When the leading end of the film is wound onto the take-up reel 8, the film-F is wound onto the take-up reel 8 by rotation of the take-up reel 8. When rewinding the microfilm F into the cartridge L, the motor 11 is deactivated and the motor 5 is driven.The film spool inside the cartridge L rotates in the direction of winding the film, and the film is rewound into the cartridge L. . Therefore, by driving either of the motors 5 and 11, the film is fed in the direction in which it is wound onto the reel 8 (hereinafter referred to as forward feed) or in the direction in which it is rewound onto the cartridge l (hereinafter referred to as reverse feed).

12 is a lamp that illuminates the microfilm F, 13 is a condenser lens, and 14 is a projection lens that enlarges and projects the image in the frame of the film F illuminated by the lamp 12 onto a screen or a photoreceptor (not shown) that is part of the printer. , 15
is a known mark detector for detecting marks m provided on the sides of each frame f of microfilm F.

The mark detector 15 has a photoelectric conversion element, and when the film F is fed, the light beam from the lamp 12 is interrupted by the mark m to generate a mark detection signal. It is counted in parts.

FIG. 2 shows a block diagram of the search control circuit.

The mark detector 15 shown in FIG. 1 outputs a mark detection signal when it detects the mark m. 16 is an input device for inputting the address number (frame number) of a desired information frame to be searched, and 17 is a control circuit consisting of a microcomputer.

20 is a motor drive circuit that controls the drive of the motor 4; 21;
2 is a motor drive circuit that controls the drive of the rewinding motor 5;
2 is a motor drive control circuit that controls the drive of the winding motor 1.1, and 23 is a solenoid drive circuit that controls the drive of the solenoid 6.

The control circuit 17 controls the operation of each motor, solenoid, etc. based on on/off signals from various operation keys or switches of the input device 16 and mark detection signals from the mark detector 15.

The control circuit 17 includes a counting circuit that counts mark detection signals from the mark detector 15, a comparison circuit that compares the count value of the counting circuit with an address number from the input device 16, a ROM as a program memory, and a data memory. It has RAM etc.

Next, the operation of the search device will be explained with reference to the operation flow diagram shown in FIG.

In the operation shown in FIG. 3, the film is always fed in the forward direction and then the film is stopped to complete the search operation.

Now, if the address number of the frame currently being searched is N, the count value of the counting circuit in the control circuit is N.
It is assumed that this frame is placed at a predetermined position (inside the projection optical path) and that the image of this frame is correctly projected onto a predetermined range on the screen.

If the address number of the desired frame to be searched next is N', then in step 100, the address number N' is input to the input device 16.
Then, in step 101, the control circuit 17 inputs the current count value N and the input address number N'
If it is determined in step 102 that N'>N, the process proceeds to step 103, and the motor 11 is driven. The film is fed forward at high speed by the drive of the motor 11, and the mark detection signals output from the mark detector 15 during this feeding are added and counted by the counting circuit (step 10).
4), and when the count value of the counting circuit approaches N', the film is fed at a low speed, and when the count value of the counting circuit reaches N' in step 105, the motor 11 is stopped and the brake is activated at the same time (step 106). ), the film stops.

When the film stops, the desired frame with address number N' is placed at the predetermined position, and the image of this frame can be read on the screen.

If N'<N in step 102, step 10
7, the motor 5 is driven. The film is fed in the opposite direction at high speed by the drive of the motor 5, and the mark detection signal outputted from the mark detector 15 during this feeding is subtracted and counted by the counting circuit (step 108). and step 10
When the count value of the counting circuit reaches N'-1 at step 9, motor 5
At the same time, the brake is applied (step 110), and the film is stopped. After stopping the motor 5, step 103
When the count value of the counting circuit reaches N' in step 105, the motor 11 is stopped (step 106), and the search operation is completed. When the film stops, the desired frame with address number N' is placed at the predetermined position. In other words, when the film is fed in the reverse direction, the frame with address number N'-1 is searched at first glance, and after searching for this frame, the film is fed in the forward direction, and when the frame with address number N' is searched, the film is stopped. , ends the search operation.

Therefore, regardless of whether the film is sent forward or backward by the search start command, the film is always fed in a fixed direction, that is, the forward direction, and then stopped to search for the desired frame. The stop position of the film at the end of the search can always be kept constant. in this case,
It is necessary to add a mark m as a dummy between the leading edge of the film and the first frame. However, this mark is subtracted by the counting circuit, but not added.

In the embodiment described above, the search operation is finished by always feeding the film in the forward direction and then stopping, but it is also possible to always feed the film in the reverse direction and then stopping it to finish the search operation. .

FIG. 4 shows a flowchart of the operation in which the film is always fed in the opposite direction and then stopped. In FIG. 4, if the address number of the frame currently being searched is N and the address number of the frame to be searched is N', then in step 200, the address number N' is input into the input trace 916 and the search is started. command. Next, in step 201, the control circuit 17
compares the current count value N with the input address number N', and if it is determined in step 202 that N'<N, the process proceeds to step 203, where the motor 5 is driven. The film is sent in the opposite direction at high speed by the drive of the motor 5, and the mark detection signal outputted from the mark detector 15 during this feeding is 5.
Subtraction is counted by the 4 number circuit (step 204). When the count value of the counting circuit approaches N', the film is fed at a low speed, and when the count value of the 84 number circuit reaches N' in step 205, the motor 5 is stopped and the brake is activated at the same time (step 206), and the film is fed at a low speed. stops, and the search operation ends. When the film stops, the desired frame with address number N' is placed at a predetermined position, and the image of this frame can be read on the screen.

If N'>N in step 202, step 20
7, the motor 11 is driven. The film is fed in the forward direction at high speed by the drive of the motor 11, and the mark detection signals outputted by the mark detector 15 during this feeding are added and counted by the counting circuit (step 208). Then, in step 209, when the A1 value of the counting circuit reaches N'+1, the motor 11 stops and the brake is activated at the same time.
1O), the film stops. After the motor 11 is stopped, the process proceeds to step 203, where the motor 5 is driven, and when the count value of the counting circuit reaches -"N' in step 205, the motor 5 is stopped (step 206). When the camera stops, the desired frame with address number N' is placed at the predetermined position.In other words, when the film is fed in the forward direction, the frame with address number N'+1 is searched at first glance;
After retrieving this frame, the film is sent in the opposite direction, and when the frame with address number N' is retrieved, the film is stopped and the retrieval operation is completed.

In the case of the embodiment shown in FIG. 4, it is necessary to record a special dummy mark m next to the last frame of the film.

do not.

The film stopping position accuracy is determined by precisely adjusting the stopping accuracy of only one drive system so that when the film is stopped when the mark on one motor and the frame is detected, the desired frame is placed in the specified position. By doing so, the film can always be stopped at a fixed position when the search is completed.

〔Effect of the invention〕

As described above, according to the present invention, no matter which direction the recording medium is fed, the recording medium is always fed in a certain direction and then stopped, so that desired information can be placed at a certain position. It can be stopped.

[Brief explanation of the drawing]

FIG. 1 is a schematic block diagram of a film reader equipped with a search device of the present invention, FIG. 2 is a block diagram of a search control circuit, and FIGS. 3 and 4 are flowcharts of a search operation. 5-11-1-motor, 15--mark detector, 16
---Human power device, 17---Control circuit. Applicant Canon Co., Ltd.

Claims (1)

[Claims] In a device that searches for desired information in a recording medium by detecting a mark on a recording medium on which information and marks are recorded, the recording medium is always fed in a fixed direction, and then the mark detection means detects the mark of the desired information. An information retrieval device characterized in that a recording medium feeding means is controlled so as to be stopped when a recording medium feeding means is detected.