JPH0756558B2 - Micro film search machine - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention described above is used for searching even in a microfilm that does not require a blip mark that has been conventionally used or cannot photograph a blip mark. The present invention relates to a microfilm searcher that can position a microfilm regardless of the conveying direction.

(Technical background of the invention and its problems) FIG. 1 is conventionally used for projecting a frame image of a roll microfilm on a screen or taking a copy, or the invention can be applied. 1 shows a schematic configuration of a possible microfilm reader printer, in which a cartridge 10 around which a search plow roll microfilm 1 is wound is a rewind side cartridge box.
The micro film 1 that is automatically rewound from the cartridge 10 is automatically wound on the take-up side auto reel 12 through the search section 4. There is. The microfilm 1 is conveyed in the M direction or the N direction in the figure by the connecting operation of the DC motor M1 that rotationally drives the cartridge 10 and the DC motor M2 that rotationally drives the auto reel 12, and the light source 3 of the search unit 4 The micro film 1 is irradiated with light and the transmitted light is focused by the lens unit 30, so that the frame image of the micro film 1 is copied onto the recording paper 50. Further, a rotatable mirror 6 is disposed below the lens unit 30. By rotating the mirror 6 and placing the mirror 6 in the optical path as shown by the broken line in the figure, The image information of the micro film 1 is projected on the screen 2 to search for a required frame.

By the way, in such a microfilm reader printer, the frame image projected on the screen 2 and the image copied on the recording paper must be respectively positioned and projected or copied at the central portions thereof. Micro film for searching for necessary frames 1
8 has a blip mark 9 corresponding to each frame as shown in FIG. 8. By searching the blip mark 9, each frame is searched and positioned.

However, depending on the image information and the type of camera, it may not be possible to photograph the blip mark for each frame. For a microfilm without such a blip mark, as shown in FIG. A sensor 74 such as a photodiode is installed at a predetermined position on the downstream side of the flow direction M of the frame image (almost in the middle of the width direction orthogonal to the flow direction of the frame image of this screen 2) to detect the frame image and the frame image. The black image is detected and positioned by the difference in brightness between the non-photographed portion and the interval. In the figure, reference numeral 20 denotes a single frame image projected on the screen 2, and if the frame image 20 is conveyed in the direction M shown in the figure, the frame image 20 is displayed at a predetermined center of the screen 2 as shown in the figure. In order to stop at the position, the braking characteristics of the motors M1 and M2, the backlash of the gears and the sensor
Because of the detection characteristics of 74, the motors M1 and M2 move from when a stop signal is issued to when the motors are actually stopped. Therefore, a sensor must be installed at a position that allows for the movement amount LM. That is, the seventh part showing the details of the main part of FIG.
As shown in FIG. (A), the sensor 74 is displaced on the rear surface of the screen 2 by the amount of movement LM to the upstream side from the position P0 at which the front end on the downstream side in the flow direction M of the frame image is desired to be stopped. If it is installed in this position, this sensor 74 will
The top 20 can be stopped at a predetermined position P0 when the front end of 20 is detected and a rising stop signal is issued.

However, when the microfilm 1 is conveyed backward,
If this sensor 74 is used also when it is conveyed in the direction, the braking characteristics of the motors M1 and M2, the backlash of the gears, and the detection characteristics of the sensor are different from those in the stacking in the M direction. The detection characteristic is to detect the trailing edge of the frame image, and to detect the frame interval (bright) to the frame interval (bright) as opposed to the frame interval (bright) to the frame image (dark) when being conveyed in the M direction. Therefore, the moving amount LN for stopping is different from the moving amount LM and is on the downstream side in the flow direction N.
As shown in FIG. 6B, the position P1 at which the actual rear end of the frame image 20 is to be stopped is shifted by (LM + LN) from the position P0 at which the rear end on the upstream side in the flow direction N side is desired to be stopped. ,
Even if a search is possible, only the approximate position of the frame image can be positioned, so this frame image deviates from the center and must be positioned manually each time, which takes time for this positioning and burdens the operator. There was a problem.

Also, since there is only one sensor, this sensor may detect dust and scratches adhering to the microfilm, lens, etc., and it will stop at a completely different position from the approximate position. There was a problem.

(Object of the Invention) The present invention has been made under the circumstances described above.
An object of the present invention is to use a microfilm search which does not require a blip mark for positioning at the time of searching, is particularly effective for a microfilm without a blip mark, and can be positioned regardless of the conveying direction of the microfilm. To provide a machine.

(Summary of the Invention) The present invention relates to a microfilm search machine for projecting a frame image of a microfilm onto a screen and searching for it.
When the frame image is conveyed in the forward direction, it is composed of at least two or more sensor elements provided separately in the width direction orthogonal to the flow direction of the frame image so as to detect the edge of the frame image. At least two of the first sensor and the first sensor are provided separately in the width direction orthogonal to the flow direction of the frame image so as to simultaneously detect the end portion of the frame image when the frame image is conveyed in the opposite direction. Second consisting of more than one sensor element
Sensor is provided at a predetermined position on both sides of the back surface of the screen, the logical product of the sensor elements of the first or second sensor is obtained, and after the logical product is obtained, the microfilm is predetermined. The micro film can be positioned by including a control means for conveying the micro film by a distance and stopping the conveyance of the micro film.

Further, in a microfilm search machine for projecting a frame image of a microfilm onto a screen for retrieval, at least one is provided separately in the width direction orthogonal to the flow direction of the frame image so as to detect the edge of the frame image. A sensor including two or more sensor elements and a bracket which is integrally attached to the sensor and is moved to a predetermined position by a solenoid and a spring according to the flow direction of the frame image are provided at a predetermined position on the back surface of the screen. A control means for obtaining a logical product of the respective sensor elements of the first or second sensor and, after obtaining the non-compartment seat, transporting the microfilm for a predetermined distance and stopping the transport of the microfilm. It is possible to position the microfilm by using and.

(Embodiment of the Invention) A micro film reader printer to which the present invention can be applied is a frame image projected on the screen 2 of the micro film reader printer shown in FIG. 1 for positioning a frame image of the micro film, for example. Are respectively positioned by using dedicated sensors provided according to the transport direction. Here, it is assumed that the length of the frame of the microfilm 1 applied to the present invention is constant for one microfilm.

FIG. 2 (A) shows a view of the screen 2 of this microfilm reader printer as seen from the back side, and FIG. 2 (B) shows a view as seen from above. As shown in FIGS. 2 (A) and 2 (B), a frame image projected on the screen 2 at a predetermined position on the rear surface of the screen 2 at the end on the transport direction M side.
A sensor element 70 such as a photodiode is provided at a position where the front end of the frame image 20 can be detected when the frame image 20 is conveyed in the M direction in the width direction orthogonal to the flow direction M of the frame 20.
A first sensor composed of A and 70B is installed, and at a predetermined position at the end of the back surface of the screen 2 on the flow direction N side, the flow direction N of the frame image 20 projected on the screen 2 is also orthogonal. In the width direction, sensor elements 70C and 70D such as photodiodes are installed at positions where the front end of the frame image 20 can be detected when the frame image 20 is conveyed in the N direction. It is designed to be used properly according to the transport direction of. Here, as shown in FIG. 2B, each of the sensor elements 70A to 70D is located on the back surface of the end portion of the frame image 20 projected on the screen 2 and blocks the projection light. The projected light is scattered light and has a light shadow, and even if the shadow is reflected when the frame image 20 is projected, it is the end portion of the image 20 and does not overlap the image itself. Further, as shown in FIG. 2 (A), the positional relationship of the first sensor with respect to the transport direction is as follows.
When the microfilm 1 is conveyed in the M direction, the movement amount LM from when the first sensor detects the front end of the frame image 20 on the side of the flow direction M until the stop signal is actually stopped. It is installed offset from the position where you want to actually stop the front end by the amount that you expect, on the other hand,
The positional relationship of the second sensor with respect to the transport direction is that, when the microfilm 1 is transported in the N direction, the second sensor detects the N direction and the front end of the frame image 20 and then the stop signal. By the amount of movement LN 'from the time the signal is emitted to the time it is actually stopped, it is installed at a position shifted upstream from the position where the front end is actually desired to be stopped. Here, since the front end of the frame image detected by the sensor elements 70A, 70B and 70C, 70D can be detected by changing from the frame interval (bright) to the frame image (dark),
Although the detection characteristics of the sensor do not change, the mechanical characteristics such as the backlash of the gears differ depending on the transport direction, so the movement amounts differ as in LM and LN ′, respectively.

Then, the microfilm searcher of the present invention positions the frame image by the control unit as shown in FIG. 3 using the first and second sensors having the above-mentioned configuration.

In FIG. 3, when the microfilm 1 is conveyed in the M direction, the sensor elements 70A,
The first sensor consisting of 70B is the comparator 8
It is binarized by a threshold THM separately set and input in 0A and 80B, and when the AND of the two sensor elements is obtained by the AND circuit 81M, a signal for detecting the front end of the frame image 20 is emitted. On the other hand, when the microfilm 1 is conveyed in the N direction, the sensor element 70C, which is installed on the N side in the conveying direction,
The second sensor consisting of 70D is the comparator 80
2 depending on the threshold THN that is set separately for C and 80D
When the AND circuit 81N obtains the logical product of these two sensor elements, it outputs a signal for detecting the front end of the frame image 20. Here, the thresholds THM and THN are
The optimum value that absorbs the variations in the detection characteristics of the sensor and the difference in brightness of the frame image as described above is set according to the state of the frame image of the microfilm, and the comparators 80A and 80B, respectively. And, the detection signal binarized by 80C and 80D is made to generate the detection signal by the logical product of two sensor elements installed in the width direction of the frame image by the AND circuits 81M and 81N, respectively. Therefore, an erroneous signal detected by only one of the sensor elements due to the dust or scratch is eliminated so that only the front end of the frame image can be correctly detected. Then, by the conveyance direction switching signal SC input to the motor control device 85 for controlling the driving of the motor M1 or M2, at the same time as the switching of the motor M1 or M2, the first sensor or the first sensor according to the conveyance direction M or N. The second sensor is selected by the selector 82 which receives the output signals of the AND circuits 81M and 81N and is output to the counter 83. Therefore, when the counter 83 receives this detection signal, it counts the number of pulses generated by the pulse encoder 86 attached to the roller of the microfilm reader printer to detect the carry amount of the microfilm 1, and the comparator 84 which receives this signal. Indicates that the remaining distance to the stop position of the microfilm reaches the setting signal SS corresponding to the movement amount LM or LN ′ to the stop according to the braking characteristics of the motors M1 and M2, gear backlash and the detection characteristics of the sensor. At this time, the motor control device 85 can stop the driving of the motor M1 or M2 to stop the frame image at a predetermined center position.

Here, the movement amounts LM and LN ′ can be adjusted by moving the mounting position of the sensor, but can be finely adjusted only by adjusting the set value of the setting signal SS to easily and accurately display the frame image. It can be positioned in the center of the screen.

In the above-described embodiment, the first and second dedicated sensors are installed at predetermined positions at both ends of the frame image projected on the screen 2 in accordance with the conveying direction of the microfilm, and they are switched and used. As shown in FIG. 4, for example, the second sensor for the conveyance direction N is arranged on the downstream side on the conveyance direction M side of the first sensor installed on the conveyance direction M side, respectively. Install this sensor 71C, 71D
And the distance between the end of the frame image 20 and a predetermined stop position may be set according to the movement amount LN described later. Here, the end portion detected by the second sensor is different from the front end in the conveyance direction M, and the rear end of the frame image 20 must be detected for conveyance in the N direction. The detection characteristic of the sensor is also from the frame image (dark) to the frame interval (bright), which is the opposite of the frame interval (bright) to the frame image (dark) when the sheet is conveyed in the M direction. In addition to the mechanical movement amount, this value also takes into consideration the detection characteristics of this sensor.

Furthermore, as shown in FIG. 5 (A), the sensor element
Sensor element 72 also serving as 71A and 71C, and the above sensor element 71B
, 71D and the sensor element 73 also serving as 71D are integrally attached to a bracket 79 as shown in the drawing, and when the conveying direction of the microfilm 1 is M by the solenoid 77, the plunger 78, the spring 76, etc., the end of the frame image 20 is The micro film 1 is moved to a position deviated from the predetermined stop position in the direction m in the figure by the amount of the movement amount LM taken into consideration, and the conveyance direction of the microfilm 1 is N.
At this time, the end of the frame image 20 is moved from the predetermined stop position to a position displaced in the n direction shown in the figure by the amount of movement LN, and this sensor is moved in accordance with the conveyance direction. Good.

As shown in FIG. 5 (B), the control unit for positioning the frame image using the sensor having the above-described configuration is such that the sensor elements 72, 73 integrally attached to the bracket 79 are respectively provided with comparators 88A, The signal is binarized by a threshold TH that is separately set and input at 88B, and when the AND circuit 89 obtains the logical product of these two sensor elements, a signal for detecting the end of the frame image 20 is emitted. Therefore, according to the conveyance direction switching signal SC input to the motor control device 85 for controlling the drive of the motor M1 or M2, at the same time when the motor M1 or M2 is switched, the conveyance direction M or N is responded to via the solenoid drive device 87. The sensor is moved to the sensor position m or n. When the counter 83 receiving the output signal of the AND circuit 89 receives the detection signal, the counter 83 counts the number of pulses emitted by the pulse encoder 86 attached to the roller of the microfilm searcher to detect the carry amount of the microfilm 1. However, the comparator 84 receiving this signal determines that the remaining distance to the stop position of the microfilm is the amount of movement LM or LN until the stop according to the braking characteristics of the motors M1 and M2, the gear backlash and the detection characteristics of the sensor. Setting signal equivalent to
When SS is reached, the motor control device 85 can stop driving the motor M1 or M2 to stop the frame image at a predetermined center position.

(Effects of the Invention) As described above, according to the microfilm searcher of the present invention, the two sensors for simultaneously detecting the edges of the frame images in the width direction orthogonal to the flow direction of the frame images projected on the screen are provided. , Provided on both ends of the back of the screen,
By only using this sensor properly depending on the frame image transport direction, no blip mark is required for searching, and even with a micro film without a blip mark, dust attached to this micro film and the lens of the search machine It is possible to easily position the frame image on a predetermined portion of the screen without being affected by scratches. Also, this positioning can be finely adjusted accurately by a simple operation such as changing the set value.

[Brief description of drawings]

FIG. 1 is a view showing a schematic structure of a microfilm reader printer which has been conventionally used or to which the present invention can be applied, and FIGS. 2A and 2B show a positioning sensor used in the present invention. FIG. 3 is a block diagram of a control unit of the microfilm searcher of the present invention, and FIGS. 4 and 5 (A) are other configurations of the positioning sensor used in the present invention. FIG. 5 (B) is an example block diagram of a control unit of a microfilm searcher using the sensor having the configuration of FIG. 5 (A), and FIG. 6 is used for a conventional microfilm reader printer. The figure which shows the structure of the positioning sensor, FIG. 7 (A) and (B).
Is a diagram for explaining FIG. 5, and FIG. 8 is a diagram showing a microfilm with a blip mark. 1 ... Roll micro film, 2 ... Screen, 3
...... Light source, 4 …… Search unit, 6 …… Mirror, 30 …… Lens system, 20 …… Frame image, 70A, 70B, 70C, 70D, 71A, 71B, 71C, 71
D, 72,73,74 ... Sensor element.

Front Page Continuation (56) References Japanese Patent Publication No. 47-40493 (JP, B1) Japanese Publication No. 53-10456 (JP, B2) Actual Publication No. 56-28591 (JP, Y2)

Claims (5)

[Claims] 1. A microfilm searcher for projecting a frame image of a microfilm onto a screen for searching,
A first sensor element comprising at least two sensor elements provided separately in the width direction orthogonal to the flow direction of the frame image so as to detect the edge of the frame image when the frame image is conveyed in the forward direction. 1 sensor and at least two sensors provided separately in the width direction orthogonal to the flow direction of the frame image so as to detect the edge of the frame image when the frame image is conveyed in the opposite direction. A second sensor composed of a sensor element is provided at a predetermined position on the back surface of the screen, and a logical product of the sensor elements of the first or second sensor is calculated,
A microfilm retrieval machine comprising control means for transporting and stopping the microfilm for a predetermined distance after the logical product is obtained. 2. The microfilm searcher according to claim 1, wherein the first and second sensors are installed at both ends of the screen. 3. The microfilm searcher according to claim 1, wherein the first and second sensors are installed at one end of the screen. 4. A microfilm searcher for projecting a frame image of a microfilm on a screen for searching.
At least two, which are separately provided in the width direction orthogonal to the flow direction of the frame image so as to detect the edge of the frame image.
A sensor including a plurality of sensor elements and a bracket which is integrally attached to the sensor and is moved to a predetermined position according to the flow direction of the frame image are provided at a predetermined position on the back surface of the screen, and the sensor is provided. The microfilm retrieval machine is characterized by including control means for obtaining a logical product of the respective sensor elements, and after obtaining the logical product, transporting the microfilm for a predetermined distance and stopping it. 5. The microfilm retrieval machine according to claim 4, wherein the bracket is moved by a solenoid and a spring.