JPH0528810B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a search device for searching for desired information in an information recording medium such as a microfilm.

[Technical background and purpose of the invention]

The microfilm includes a film F1 with a mark M on the side of each frame f on which information is recorded as shown in Fig. ₁ , and a film F1 with a mark M attached to the side of each frame f as shown in Fig. 2.
There is an unmarked film F ₂ on the side. In a retrieval device using such a film, the leading end of the film is autoloaded from the supply section to the take-up section, and when the leading end of the film is wound around the take-up reel of the take-up section, autoloading is finished. Thereafter, the film is fed from the supply section to the take-up section by driving the take-up reel.

To perform autoloading, press the autoloading command button, feed the film in the supply section while this button is pressed, and stop pressing the button when the first mark or frame on the film reaches the mark detector. After completing the autoloading operation, if you are using film with marks, enter the address number of the desired frame and perform a search operation, or if you are using film without marks, feed the film one frame at a time. In this method, the desired frame is searched by looking at the information of the frames projected on the screen, but this requires holding down the autoloading command button for a long time, which is cumbersome to operate and also prevents autoloading. If you make a mistake at the end of loading and the first frame passes a predetermined position, it is necessary to rewind the film after autoloading is completed, which has the drawback that it takes time to search for the first frame.

The present invention provides a search device that eliminates the above drawbacks.

〔Example〕

The present invention will be explained below using specific examples shown in the drawings.

FIG. 3 shows a microfilm reader having a retrieval device of the present invention. In the figure, 1 is an illumination lamp, 2 is a condenser lens, and 3 is a field lens, which constitute illumination means.
This illumination means illuminates one or more frames of the microfilm F. Reference numerals 4 and 5 denote film pressure plates made of transparent glass plates, which are separated from the film while the microfilm is being fed, and when the film stops, come into contact with the film to hold the film at a fixed position (focal position) in a flat plane. The film pressing plate is moved by, for example, a known plunger. Reference numeral 6 indicates a projection lens for enlarging and projecting the image of the microfilm onto a screen, and 7 indicates a screen for observing the projected image. 8
Reference numeral denotes a cartridge for storing a reel R1 on which a microfilm F is wound, 9 and 10 are film guide rollers, 11 is a mark detector for detecting marks on the film, and R2 is a take-up reel for winding the film. Reference numeral 15 denotes a feed roller for drawing out the film in the cartridge 8 and feeding it to the take-up reel R2, which moves between a position in contact with the film in the cartridge 8 and a position away from the film.

FIG. 4 shows the film feeding section of the leader, and _M1 is a winding motor that rotates the reel R1 in the cartridge 8 and feeds the film F in the direction of arrow A. _M2 is a take-up motor that rotates the take-up reel R2 and feeds the film in the direction of arrow B. _M3 is an autoloading motor that rotates with the feed roller 15, and S is a solenoid that moves the feed roller between a film contact position and a separation position.

Reference numeral 16 denotes a brake device that stops the rotation of a rotating shaft 18 that connects the reel R1 and the motor _M1 , and 17 a brake device that stops the rotation of the rotating shaft 19 that connects the take-up reel R2 and the motor _M2 . After winding the film onto take-up reel R2, motor _M2
When the brake devices 16 and 17 are deactivated, the take-up reel R2 rotates, and the film F is fed from the reel R1 to the take-up reel R2 (in the direction of arrow B) and wound onto the take-up reel. It will be done. Thereafter, when the motor _M2 is deactivated and the brake device 17 is activated, the rotation of the take-up reel 2 is stopped and the film is stopped. During winding of the film, that is, while feeding the film in the direction of arrow B, the reel R1 rotates as the film is fed. During rewinding, that is, when feeding the film from the take-up reel R2 to the supply reel R1 (in the direction of arrow A), the motor _M1 may be activated and the brake devices 16 and 17 may be deactivated. During this rewinding, the take-up reel R2 rotates following the film feed, but the application terminal of the motor _M2 is short-circuited to prevent the film from sagging. 20 is a first pulse generator that generates pulses in response to the rotation of the reel R1, and 21 is a second pulse generator that generates pulses in response to the rotation of the take-up reel R2.

The first pulse generator 20 includes a disc 22 fixed to a rotating shaft 18, and a detection device including a light emitting diode and a photoelectric conversion element that are placed opposite each other with slits 23 provided at regular intervals on the circumferential surface of the disc 22. It is composed of a container 24. The disc 22 rotates integrally with the rotating shaft 18, and when the disc 22 rotates, the optical path connecting the light emitting diode of the detector 24 and the photoelectric conversion element is connected to the disc 2.
2, the photoelectric conversion element generates electrical pulses.

The second pulse generator 21 is the first pulse generator 20
A disk 25 is configured in the same manner as above, is fixed to the rotating shaft 19, and has a large number of slits 26 at regular intervals on its circumferential surface, and a light emitting diode and a photoelectric conversion element are placed opposite each other with the disk 25 in between. It consists of a detector 27 having a

The disk 22 and the disk 25 are configured to have the same size, have the same number of slits on their circumferential surfaces, and when rotated at the same angle, the first and second pulse generators 20 and 2
It is configured to generate the same number of pulses from 1 to 1. That is, supply reel R1 and take-up reel R2
When rotated by the same angle, the first and second pulse generators 20 and 21 generate the same number of pulses. The mark detector 11 generates a mark detection signal when the light from the lamp 1 is blocked by the mark M or the film base.

FIG. 5 shows a block diagram of the film feed control circuit, in which the same parts as those in FIG. 4 are designated by the same reference numerals. 51 is a control circuit consisting of a microcomputer (hereinafter referred to as CPU); 52 is a control circuit consisting of a microcomputer (hereinafter referred to as CPU);
53 is a ROM, RAM 54 is a display, 55 is an interface (hereinafter referred to as I/F), and 56 is a mode changeover switch.

The CPU 51 controls the operation of each part according to the program stored in the ROM 52. The RAM 53 stores the address number of the desired frame or the frame currently being searched, and the display 54 displays the address number of the desired frame. I/F55 is
This is an interface that connects the CPU 51 and motors M ₁ , M ₂ , M ₃ and other input/output devices.

The mode changeover switch 56 is turned off when the first mode using the film F ₁ with marks is selected, and turned on when the second mode using the film F ₂ without marks is selected. A keyboard 57 includes a numeric keypad, a search key, and the like.

FIG. 6 shows the flow of operation of the above device.

Next, the operation of the above device will be explained. First, film
When using F ₁ , turn off switch 56,
When the address number of a desired frame is entered on the keyboard 57 and the search key is pressed, an autoloading operation is started. That is, the motor M ₃ and solenoid S are turned on, the feed roller 15 comes into contact with the film, the brakes 16 and 17 are turned off, and the motor
_M2 rotates. As a result, the leading end of the film is pulled out from the cartridge 8 and fed out along a film guide (not shown). After autoloading starts, the tip of the film is on the take-up reel R.
2, the leading end of the film is automatically wound onto the take-up reel R2 by a known automatic wind-up mechanism.
Turns off motor _M3 and solenoid S when film wrapping is detected. If the leading edge of the film is wound around reel R2 normally, the film will be moved by the motor.
It is wound onto the take-up reel by _M2 . In addition, the second
Winding of the film around the take-up reel can be detected by detecting changes in the time width of the pulses generated by the pulse generator 21, but winding may also be detected by various known methods. Furthermore, by comparing the number of pulses or pulse widths generated from the first pulse generators 20 and 21, it is possible to detect whether or not the film has been normally autoloaded. After the film is normally wound on the take-up reel R2, that is, after autoloading is completed, a predetermined number (B) of pulses generated from the pulse generator 20 or 21 are counted. When a predetermined number of pulses are counted, if the switch 56 is off, the motor M ₂ continues to be driven, and when the mark detector 11 detects the mark of the desired top, the motor M ₂ is turned off and the brake devices 16, 17 are turned off. Turn on to stop the film. When the film stops, a desired frame is placed on a predetermined projection optical path, and information about this frame is projected onto a screen.

Next, when replacing the cartridge and using the unmarked film _F2 , turn on the switch 56 and press the search key to start the autoloading operation in the same manner as described above. i.e. the motor
_M3 , solenoid S is turned on, brake 16,
17 is turned off and motor _M2 rotates. As a result, the leading end of the film is pulled out from the cartridge and sent out along the film guide. The leading edge of the film reaches the take-up reel R2 and is wound onto the take-up reel R2 by an automatic winding mechanism. When film wrapping is detected, motor _M3 /solenoid S
turns off. Thereafter, the film is wound onto the take-up reel R2 by driving the motor _M2 , and after the winding is detected, the pulse generator 20 generates a predetermined number of pulses (B).
If the switch 56 is on when counting, it turns off the motor _M2 and turns off the brake device 16,1.
Turn on 7 to stop the film. When the film stops, the first frame on the film is placed in the projection optical path or in front of the projection optical path. Generally, the length A from the leading edge of the film to the first frame on the film (the length of the film leader) is set to be approximately constant, so the length A from the leading edge of the film to the top of the film is set approximately constant. If the number of pulses generated by the pulse generator 20 while feeding the frames to the projection optical path is set to the predetermined number (B), the leading frame can be stopped on the predetermined projection optical path. When using an unmarked film with different leader lengths, the predetermined number (B) may be changed depending on the length.

As described above, when using unmarked film, the film is stopped after the first frame reaches the predetermined projection optical path or its vicinity, so information is searched sequentially from the first frame immediately after the film stops. and can be observed. In this case, the user may press the key on the keyboard 57 to feed the film one frame at a time. Of course, the film may be fed continuously at a low speed so that each frame is scanned.

〔effect〕

As described above, according to the present invention, when the first mode in which an information recording medium with a mark is attached is selected and a command is given to start a search, the information recording medium stops when the search mark of a desired image is detected. , when the second mode that uses an unmarked information recording medium is selected and a search start is commanded, the information recording medium stops when the information recording medium has been transported a predetermined length. In a medium, desired information can be stopped at a predetermined position, and in an information recording medium without a mark, the leading information can be stopped at a predetermined position. This allows you to play back and read the information on an unmarked information recording medium from the beginning, and when using an unmarked information recording medium, you may mistake the information recording medium for a marked information recording medium and place it at the end. It is possible to prevent erroneous operations that result in the transfer of

[Brief explanation of drawings]

1 and 2 are front views of the film applied to the present invention, FIG. 3 is a schematic configuration diagram of the film reader, FIG. 4 is a perspective view of the film feeding section, and FIG. 5 is the film feeding control circuit. FIG. 6 is a flow diagram of the feeding operation. 8...Cart cartridge, R2...Take-up reel,
M ₁ , M ₂ , M ₃ ... motor, 56 ... mode changeover switch.

Claims (1)

[Claims] 1 In a search device that searches for desired information by detecting a mark attached to an information recording medium, a first mode in which an information recording medium with a mark is used is used, and an information recording medium without a mark is used. mode selection means for selecting a second mode in which the information recording medium is transferred from the supply section to the winding section; When the mark of the desired information is detected, the transfer is stopped to position the desired information at a predetermined position, and when the second mode is selected, the information recording medium is transferred to the winding section by a search start command. 1. A retrieval device comprising: means for controlling a transporting means so as to stop the transporting means when the information recording medium is transported a predetermined length.