JPH11142968A - Frame detection part cleaning method for microfilm retrieval device and microfilm for cleaning - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the incident and emitting efficiency of light at the end surfaces of optical fibers and to prevent retrieving accuracy from being lowered by passing a microfilm provided with a cleaning part having a soft and thin cloth-like member between optical fiber holding blocks and cleaning the end surfaces of the optical fibers. SOLUTION: In this microfilm 250 for cleaning, the cleaning part 256 is interposed between a leader film 252 and a trailer 254. The cleaning part 256 is made of a cloth 258 such as non-woven fabric or felt whose both surfaces are soft. A splicing film 260 is sewed at both ends of the cloth 258 by a fine thread 262. Since the thickness B of the cloth 258 is set to be thicker than the size of a gap A between the optical fiber holding blocks 100 and 102 of a frame detection part 98, the cloth 258 is compressed when it is passed through gap between the blocks 100 and 102. Thus, the end surfaces of the optical fibers 104 and 106 appearing at the opposed surface of the blocks 100 and 102 is rubbed with the cloth 258 so that the soil thereof is eliminated and they are cleaned.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for cleaning a frame detecting portion of a microfilm search device for determining the presence or absence of a frame from a change in density in the running direction of a microfilm, and a cleaning microfilm used directly for carrying out the method. It is about.

[0002]

2. Description of the Related Art In order to search for microfilms,
A device is known in which a search mark (blip) is attached to each frame at a position that does not overlap the traveling locus width of the frame, and the blip is detected and searched.

On the other hand, it has been considered that a search is performed by detecting the presence or absence of a frame instead of the blip. That is, a density sensor is provided within the width of the traveling locus of a frame, and the presence or absence of a frame is determined from a change in film density detected by the density sensor.

[0004]

In order to detect the presence or absence of a frame, the end faces of a pair of optical fibers are opposed to each other with the film interposed therebetween, and light incident on one of the optical fibers is guided to the film and transmitted through the film. It is conceivable that light is received by the other optical fiber and the amount of the received light is detected by an optical sensor. In the case of running the film between the end faces of the optical fibers facing each other, it is necessary to precisely align the optical axes of the end faces of the two optical fibers.

However, optical fibers are extremely fine. For example, in order to detect a frame of a 16 mm-wide microfilm, it has been studied by the present inventor to detect a film density for each feed amount of 0.1 mm of the film. Needs to be about 0.5 mm. For this reason, it is required that the alignment of the optical axis of the optical fiber can be performed with high accuracy and that the optical axis does not become out of order even after long-term use.

Therefore, it is conceivable that a pair of optical fiber holding blocks crossing the film in the width direction are arranged to face each other with the film interposed therebetween, and the optical fibers are held in both blocks. In this case, the film passes through the gap between the two blocks and the film runs at a high speed. However, since the end faces of the optical fibers are exposed on the opposing faces of the two blocks, dirt adheres to the end faces of the optical fibers. For this reason, there also arises a problem that the light input / output efficiency at the end face of the optical fiber is reduced and the search accuracy is reduced.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and even if an end face of an optical fiber becomes dirty due to a high-speed running of a film between a pair of optical fiber holding blocks for holding an optical fiber, It is a first object of the present invention to provide a method for cleaning a frame detecting portion of a microfilm search device which can easily remove the dirt, increase the light input / output efficiency of the optical fiber end face, and prevent a decrease in search accuracy. . It is a second object of the present invention to provide a microfilm for cleaning which is directly used for carrying out the method.

[0008]

According to the present invention, an object is to provide a pair of optical fiber holding blocks traversing a microfilm in the width direction and facing both surfaces of the microfilm, and an end face of one end penetrated and held by each of the blocks. A plurality of optical fibers facing each other across the microfilm, and a light source that guides light to the optical fibers held in one block,
A frame detection unit having a light sensor for detecting the amount of light incident on the optical fiber held by the other block, and determining the presence or absence of a frame based on a binarized signal obtained by binarizing the output of the optical sensor. A frame detecting unit cleaning method applied to a microfilm searching apparatus for searching for frames by using a microfilm passing between the pair of optical fiber holding blocks, the cleaning unit having a soft and sufficiently thin cloth member on both sides of the microfilm. By passing the cleaning unit between the blocks together with the microfilm, the end face of the optical fiber facing the opposing surfaces of the two blocks is cleaned, and the frame detection unit cleaning method of the microfilm search device, Achieved.

A second object of the present invention is to provide a cleaning section which is soft and sufficiently thin on both sides between a trailer film which is wound and stored in a cartridge and has a frame printed thereon and a leader film connected to the head of the trailer film. Cleaning microfilm of a microfilm search device, characterized by the following:
Is achieved by

[0010] The cleaning section may be formed of a soft band-shaped cloth on both sides, and both ends of the cloth may be smoothly connected to the leader film and the trailer film, respectively. The cleaning section may be formed of a band-shaped cloth adhered to both sides of the base film. In this case, the positions of the cloths bonded to both sides of the base film can be shifted so as not to overlap in the longitudinal direction of the film. Non-woven fabric or non-woven paper may be used instead of cloth.

[0011]

FIG. 1 is a view showing a use state of an embodiment of a microfilm search apparatus to which the present invention is applied, FIG. 2 is a perspective view showing the inside of a scanner used here, and FIG. FIG. 4 is a side view showing an arrangement, FIG. 4 is a perspective view showing a line sensor driving section, FIG. 5 is a view showing a main part, and FIG.

In FIG. 1, reference numeral 10 denotes a computer main body, which incorporates a CPU and the like. Reference numeral 12 denotes a display means such as a CRT or a liquid crystal plate, and 14 denotes a keyboard, which are placed on a desk 16. Reference numeral 18 denotes a scanner housed under the desk 16, which incorporates the microfilm search device of the present invention. Reference numeral 20 denotes a printer placed beside the desk 16.

The scanner 18 has a cartridge insertion port 22 at the upper part of the front surface thereof.
4 (see FIGS. 2 and 3), the image of the micro-roll film 26 having a width of 16 mm is read at a low density. The read image is subjected to predetermined image processing by a CPU or the like in the computer main body 10 and then displayed on the display unit 12.

This image reading is performed while the line sensor 96 described below is stopped and only the film 26 is run.
In the meantime, the display means 12 of the CRT displays the read image while changing it continuously in synchronization with the running of the film 26. Therefore, the display on the display means 12 moves in synchronization with the running of the film 26, and an image substantially similar to that projected on the screen can be displayed on the display means 12.

At the time of a manual search, the operator looks at the image on the display means 12 and instructs output for an image that needs to be printed. Based on this output instruction, the scanner 18 sets the position of the frame to a correct position and reads the entire image with high-density image quality. This high-density image is printed out to the printer 20, stored in a memory such as a magneto-optical disk, or transferred to an external processing device.

At the time of automatic search, the address of the target frame is input from the keyboard 14. In this automatic search, a target frame is searched by detecting frames and counting the number of frames. This frame search is performed by using the determination result of the determination unit 112 described later indicating the presence or absence of the frame, and
16 is performed.

Next, the configuration of the scanner 18 will be described. The scanner 18 has a vertically long housing 28, and a supply-side reel drive unit 30 is provided above a front portion of the housing 28, and a take-up reel drive unit 32 is provided below the front portion. The supply-side reel drive unit 30 inserts the cartridge 2 into the cartridge insertion slot 22.
When the cartridge 4 is inserted, the cartridge 24 is automatically moved to engage the reel 24A with the rotating shaft. Further, the leading end of the film 26 is pulled out, sent downward, and guided to the take-up reel 32A of the take-up reel drive unit 32.

Here, as shown in FIGS. 2 and 3, the film 26 passes through the rear side of the gap between the reel drive units 30 and 32, that is, the rear side as viewed from the front of the housing 28. In FIG. 3, 34, 34,
36, 36 are guide rollers for the film 26. Accordingly, a space 38 is formed between the gap and the front panel 28A of the housing 28, and a light source unit 52 described later is accommodated therein.

The take-up reel drive section 32 has a drive belt 40 that runs in contact with the reel 32A as shown in FIG. This drive belt 40 is a guide roller 4
2, 44, a drive roller 46, an encoder 48, and a tension roller 50, and are driven by the drive roller 46 to travel in the film winding direction (the direction of the arrow). The encoder 48 controls a constant feed amount of the film 26 (for example, 0.1 m
m) to output a sampling signal.

Numeral 52 denotes a light source unit accommodated in the space 38 between the reel driving units 30 and 32, and a lamp 54,
It includes a reflecting mirror 56, a condenser lens 58, an appropriate filter, and the like. In FIG. 2, reference numeral 60 denotes a power supply circuit, and 62 denotes a power control circuit such as a motor.

Next, the line sensor driving section 64 will be described.
The line sensor driving section 64 is integrated with the projection lens 66. That is, as shown in FIGS. 3 and 4, the frame (rotating frame) 68 of the line sensor driving unit 64 is integrally formed with a cylindrical portion 70 for holding the projection lens 66.
The projection lens 66 held by the cylindrical portion 70 has a fixed focal point and a magnification of about twice. The cylindrical portion 70 is rotatably held by a frame (fixed frame) 72 fixed to the housing 28 so that the inclination of the image to be read can be corrected. Here, the cylinder 70 rotates about an optical axis 74 perpendicular to the film 26.

The cylindrical portion 70 of the rotating frame 68 and the pulley 76 of the servomotor 76 attached to the fixed frame 72
A belt 78 is wound around A. The rotation frame 68 is rotatable around the optical axis 74 by the rotation of the motor 76.

As shown in FIG. 4, a movable base 80 is attached to the rotating frame 68 on a surface opposite to the cylindrical portion 70. That is, the movable base 80 is provided with a pair of guide rods 82, 82.
Slidably held by the optical axis 74 near the opening of the cylindrical portion 70.
Can be reciprocated in a direction orthogonal to.

A belt 86 wound around pulleys 84, 84 is provided on the rotating frame 68 in parallel with the reciprocating direction of the movable table 80.
And one side of the movable table 80 is fixed to the belt 86. One pulley 84 has a servo motor 8
The rotation of 8 is transmitted via the belt 90. As a result, by rotating the servo motor 88 forward and backward, the movable table 8 is rotated.
0 can be reciprocated on a plane orthogonal to the optical axis 74.

The movable table 80 has guide rods 82, 82
A long window 92 is formed in a direction perpendicular to the direction of the movable table 80, that is, in a direction perpendicular to the reciprocating direction of the movable table 80. This long window 92
Is located on the optical axis 74 in the longitudinal direction. A printed wiring board 94 is fixed to the rear surface of the movable base 80, that is, the surface opposite to the cylindrical portion 70 so as to be orthogonal to the optical axis 74.

A CCD line sensor 96 facing the long window 92 is fixed to the substrate 94 (FIG. 3). The substrate 94 is also provided with a preamplifier for amplifying the output of the line sensor 96. CCD line sensor 9
Of course, the light receiving surface of No. 6 coincides with the image forming surface of the projection image of the projection lens 66.

Next, an apparatus for detecting a frame, that is, a frame detecting section 98 will be described with reference to FIG. Microfilm 26
Upstream of the image reading position, that is, the position of the optical axis 74 (on the supply reel 24A side), a pair of optical fiber holding members that cross the film 26 in the width direction and oppose each other with a slight gap between both surfaces of the film 26. Blocks 100 and 102 are provided. Each of these blocks 100 and 102 has nine optical fibers 104 and
106 is inserted. These blocks 100, 1
The structure of No. 02 will be described later.

The optical fibers 104 and 106 are arranged perpendicularly to the film 26 in the blocks 100 and 10.
2 and these end faces face each other with the film 26 interposed therebetween. That is, the end faces of the nine optical fibers 104 face the end faces of the nine optical fibers 106, respectively. As a result, nine combinations in which the end faces face each other with the film 26 interposed therebetween can be obtained.

The nine optical fibers 104 held by the block 100 are bundled and guided to the vicinity of the lamp 54 of the light source 52. Therefore, light enters the nine optical fibers 104 from the lamp 54 and is guided to one surface (the surface on the block 100 side) of the film 26.

Light emitted from nine optical fibers 104 opposed to each other enters the nine optical fibers 106 held by the block 102 via the film 26. 9
The optical fibers 106 are guided from the block 102 to the optical sensors 108, respectively. The density signals output from the nine optical sensors 108 are separately input to a binarization unit 110, where they are binarized in synchronization with a sampling signal output from the encoder 48.

Each of the nine binarized signals is determined by a decision unit 112.
The determination result of the presence or absence of a frame is obtained based on the output of each optical sensor 108 here. This determination unit 112
Is also supplied with a signal from the sensor selection unit 114. The sensor selection unit 114 controls the optical fiber 106 whose end face is located within the traveling locus width of the frame corresponding to the film shooting method.
And the optical sensor 108 connected thereto. The determination unit 112 selects only the determination result of the sensor 108 selected by the sensor selection unit 114 from these nine determination results, and determines the presence or absence of a frame according to a shooting method such as simplex, duo, or duplex.

As shown in FIG. 6A, the end faces of the nine optical fibers 104 and 106 are on a straight line perpendicular to the running direction of the film 26, and are located at different positions in the width direction of the film 26. is there. In this embodiment, since the optical sensor 108 detects the amount of incident light on the optical fiber 106,
This is substantially the same as the optical sensor 108 located at a position where the end face of the optical fiber 106 faces the film 26. Therefore, FIG. 6 illustrates that the optical sensor 108 is located at the end face position of the optical fiber 106 on the film 26 side.

These nine optical sensors 108 are positioned in the film width direction so that a plurality of optical sensors 108 always pass through one frame even when the film photographing method is different. FIG. 6A shows the case of the simplex system, in which case the determination unit 112 determines whether the sensor selection unit 1
The frame is detected by the eight optical sensors 108 (A) based on the output of No. 14 and the blip 1 is detected by the other optical sensor 108B.
18 is detected.

Therefore, the determination section 112 determines the presence or absence of a frame using the binary signals output from the eight binary sections 110. For example, if a majority or a certain percentage or more of the determination results is black, it is determined that a frame exists. The presence or absence of a frame may be determined using the logical product or logical sum of the determination results. In this case, it is also possible to search using the output of the optical sensor 108B that detects the blip 118.

FIG. 6B shows the case of the duplex system, in which the front and back of the document are simultaneously photographed on the upper and lower channels, and there is an optical sensor 108C which does not detect a frame between both channels. Therefore, in this case, the determination unit 11
2 detects the frame of each channel based on the output of the sensor selection unit 114, using the outputs of three optical sensors 108D and 108E passing within the width of the upper and lower channels except for the optical sensor 108C. .

FIG. 6C shows the case of the duo system.
The center optical sensor 108F does not detect a frame. For this reason, based on the output of the sensor selection unit 114, the determination unit 112 detects the frame of each channel by four optical sensors 108G and 108H included in the two groups divided into the upper and lower groups. The search unit 116 searches for a target frame by integrating the determination signals output from the determination unit 112.

Next, the optical fiber holding blocks 100 and 102 for holding the ends of the optical fibers 104 and 106 are shown in FIGS.
Explanation will be made using 0. 7A and 7B are a side view and a bottom view showing a combined state of these blocks 100 and 102, FIG. 8 is an exploded perspective view of both blocks, and FIG. 9 is a sectional view of the disassembled state of both blocks. 10 is an enlarged cross-sectional view of the block showing the vicinity of the holding portion at one end of the optical fiber.

The blocks 100 and 102 have exactly the same structure and are used by being inverted and combined. That is, the two blocks 100 and 102 have their opposing surfaces made of metal plates 100A and 102A such as stainless steel, and after these metal plates 100A and 102A, 30% by weight of glass fiber is added to polybutylene terephthalate (PBT) or the like. Synthetic resins 100B and 102B mixed to a certain degree are integrally molded. Both ends of the metal plates 100A and 102A and the resins 100B and 102B are extended to form attachment portions 100C and 102C to a frame (not shown) of the device. Here, the mounting portions 100C and 102C are the blocks 10
0 and 102 are displaced in the width direction. Therefore, when the blocks 100 and 102 are combined and mounted on the apparatus frame (see FIG. 7B), it is possible to prevent a tool such as a driver from interfering with the other mounting portion 100C or 102C.

At the center in the longitudinal direction of both blocks 100 and 102, the nine optical fibers 104 and 106 are straight lines L.
It is held at a predetermined interval above (see FIG. 7B). Here, the optical fibers 104 and 106 are covered with a resin 202 as shown in FIG. These optical fibers 1
04 and 106 are exposed by peeling off the resin 202 at one end by a predetermined length, passing through the holding holes 204 formed in the blocks 100 and 102, and using the adhesive 206 to form the blocks 10 and 106.
0, 102. And block 10
The surface is polished together with the surfaces 0 and 102 to form a flat surface.

Here, the metal plates 100A and 102A are shown in FIG.
As shown at 0, both edges of the opposing surfaces of the blocks 100 and 102 are smoothly polished in an arc shape. Metal plate 1
Near the center of 00A and 102A, optical fibers 104,
Oval openings 100D, 102D surrounding the end face of the opening 106 are formed (FIGS. 8, 9, 10).
Resins 100B and 102B are filled in 2D. Therefore, the surfaces of the metal plates 100A and 102A are polished so that the metal plates 100A and 102A and the openings 100D and 1A are polished.
The resin in 02D and the end faces of the optical fibers 104 and 106 are positioned on the same plane, and these can be made a smooth plane.

One of these blocks 100 and 102
At 02, a positioning reference pin 208 and a coupling pin 210 are fixed at positions as far apart as possible in the longitudinal direction. These pins 208 and 210 are pipe-shaped, are internally threaded at both ends, and have a flange 212 at the center. The reference pin 208 is inserted from the metal plate 102A side into a circular hole (reference hole) 214 formed in the metal plate 102A and the resin 102B of the block 102, and the screw 216 is screwed into the block 102 from the resin 102B side. Fixed.

Similarly, the connecting pin 210 is connected to the metal plate 102A.
In addition, screws 220 are temporarily fixed to long holes 218 long in the longitudinal direction of the block 102 formed in the resin 102B. On the other hand, the other block 100 has a circular reference hole 222 into which the reference pin 208 is non-movably fitted, and an elongated hole 224 long in the longitudinal direction of the block 100 into which the coupling pin 210 is movably engaged. .

Therefore, when assembling these blocks 100 and 102, first, the reference holes 22
2 is fitted to the reference pin 208 of the block 102,
At the same time, the blocks 100 and 102 are combined while the slot 224 is engaged with the coupling pin 210. Then, screws 226 and 228 are inserted from the block 100 side into the pin 208
The screw 220 of the connecting pin 210 may be screwed from the block 102 side.

At this time, the flanges 212 provided on the pins 208 and 210 keep the gap between the blocks 100 and 102 constant, electrically connect the metal plates 100A and 102A, and keep them at the same potential. These metal plates 1
00A and 102 are grounded by connecting the mounting portions 100C and 102C to the device frame.

As described above, both blocks 1 are
Since the positioning in the width direction is performed by the connecting pin 210 while the positioning in the longitudinal direction of 00 and 102 is performed, both blocks 1
The optical axes of the optical fibers 104 and 106 of 00 and 102 can be aligned and held with high precision. Pin 208,
By unscrewing the screws 216, 220 or 226, 228 of the 210, the two blocks 100, 102 can be easily disassembled, and the end faces of the optical fibers 104, 106 can be cleaned to remove dirt.

The reference holes 2 of both blocks 100 and 102
The processing of 14, 222 and the long holes 218, 224 for coupling can be performed as follows. One method is to set both blocks 100 and 102 in a separately prepared jig, fix the optical fibers 104 and 106 with their optical axes aligned, and then drill by passing through both blocks 100 and 102. The reference holes 214 and 222 or the coupling long holes 218 and 224 may be simultaneously processed. Another way is
The resin 100B and 102B sides of the blocks 100 and 102 are integrally formed by one common mold, and the reference holes 2 are formed.
After the holes 14, 218 and the connecting long holes 218, 224 are simultaneously drilled, the resin portion is divided by a cutter. Further, the metal plates 100A, 102
A may be formed in a cylindrical shape and a resin is filled therein.

Next, a cleaning microfilm 250 used for cleaning the end faces of the optical fibers 104 and 106 held by the blocks 100 and 102 will be described with reference to FIG. FIG. 11A shows this microfilm 2.
50 is a side view, and FIG. This FIG.
252 is a leader film, 254 is a trailer film, and 256 is a cleaning unit interposed between the films 252 and 254.

The trailer film 254 is a film on which an image of a frame is imprinted. Normal microfilm 2
6 (see FIGS. 2 to 7), the leader film 252 is directly connected to the front end of the trailer film 256. On the other hand, the cleaning microfilm 250 used here has a cleaning portion 256 between the films 252 and 254. The difference is that they are interposed. The cleaning microfilm 250 is housed in the cartridge 24 in the same manner as the microfilm 26 described above, loaded into the scanner 18, and passed through the frame detection unit 98.

As shown in FIG. 11, the cleaning section 256 is made of a cloth 258 as a soft cloth member such as a nonwoven fabric or a felt, and has a long band shape of about 1 m in length and 16 mm in width. At both ends of the cloth 258, connection films 260, 260 sandwiching the cloth from above and below are sewn with fine threads 262. These connection films 260, 260
8 and a leader tape 25 between the extending portions.
2. Adhesive tape 264 with trailer tape 254 interposed
Are connected to both sides of these tapes 252, 254.

The connection film 260 is made of PET (polyethylene terephthalate resin) and has a thickness of about 125 μm.
It is. In this case, the leader film 252 has a thickness of about 125 μm, and the trailer film 254 has a thickness of about 125 μm.
μm. The thickness B of the cloth 258 is determined by the frame detection unit 98.
Is set to be larger than the gap size A of the blocks 100 and 102 (B> A).
02 as it passes through the gap. Therefore block 1
Optical fibers 104 appearing on opposite surfaces of 00 and 102;
The cloth 258 rubs the end surface of the cloth 106 to remove dirt and clean it.

FIG. 12 shows another embodiment of the cleaning microfilm. Microfilm 250A shown here
Is the leader film 252 and the tracer film 25
The cleaning portion 256A interposed between the base member 4 and the base member 4 is formed of a thin PET base film 270 and cloths 272 and 272 as cloth-like members adhered to both surfaces thereof. Here, the cloth 272 has a soft surface and sufficient elasticity. Further, both ends of the base film 270 are bonded to the adhesive tape 27.
4 are connected to the films 252 and 254. Note that the cloths 272 and 272 are shifted in position so as not to overlap in the longitudinal direction of the film 270, so that the cleaning unit 256
The thickness of A can be reduced so that it can easily pass through the gap between the blocks 100 and 102.

In this embodiment, blocks 100 and 102
Are molded integrally with the stainless metal plates 100A and 102A and the PBT resins 100B and 102B, so that deformation due to temperature change is unlikely to occur. Further, since the metal plates 100A and 102A are exposed on the surface facing the film 26, the film 26 can be prevented from being charged by grounding the metal plates 100A and 102A to the apparatus frame.

In the embodiment described above, since the light is guided to each optical fiber 104 by using the light source section 52 for photographing an image, there is an advantage that the light source can be simplified. However, the present invention may use another light source or use a plurality of light sources to guide light to each optical fiber 104.

In the present invention, the optical fiber 10
Since the optical fibers 104 and 106 are used, the end faces of the optical fibers 104 and 106 can be arranged close to each other in the width direction of the narrow film 26. However, the present invention also includes the case where one optical fiber is held in each of the blocks 100 and 102. In this case, the output of the binarizing unit 110 is directly used as a determination signal indicating the presence or absence of a frame, so that the determination unit 112 is unnecessary.

In this embodiment, since a plurality of density sensors (optical sensors) are arranged on a straight line perpendicular to the film running direction, the presence / absence of a frame can be detected at the same time. Therefore, unlike the case where a plurality of density sensors (optical sensors) are arranged shifted in the running direction of the film, it is not necessary to correct the output timing of each density sensor (optical sensor), and the circuit configuration is simplified. .

[0056]

As described above, according to the first aspect of the present invention, the microfilm is provided with a cleaning portion having a soft and sufficiently thin cloth-like member on both sides, and the cleaning portion is passed between the two blocks to form an end face of the optical fiber. Is to clean the
The end face of the optical fiber can be cleaned very easily by using the cartridge containing the microfilm to run the film in the same manner as when searching. Therefore, it is possible to increase the light input / output efficiency of the optical fiber end face and prevent a decrease in search accuracy.

According to the second aspect of the present invention, since a cleaning section which is soft and sufficiently thin on both sides is provided between the microfilm leader film and the tracer film, the microfilm used for carrying out the first aspect of the present invention. Can be obtained. Here, the cleaning section can be formed by a band-shaped cloth having both sides soft (Claim 3), and the cleaning section can be formed by bonding a band-shaped cloth to both sides of the base film (Claim 4). ). In this case, if the positions of the cloths to be bonded to both sides are shifted so as not to overlap in the longitudinal direction of the base film, the thickness of the cleaning portion is reduced, and the cloth can be easily passed through the gap between the blocks.

[Brief description of the drawings]

FIG. 1 is a diagram showing a use state of an embodiment of a microfilm search device to which the present invention is applied.

FIG. 2 is a perspective view showing the inside of a scanner used here in a see-through manner;

FIG. 3 is a side view showing the arrangement of the main part.

FIG. 4 is a perspective view showing a line sensor driving unit.

FIG. 5 is a diagram showing a main part.

FIG. 6 is a diagram illustrating an arrangement of optical sensors.

FIG. 7 is a side view and a plan view showing a combined state of both blocks.

FIG. 8 is an exploded perspective view of both blocks.

FIG. 9 is an exploded sectional view of both blocks.

FIG. 10 is an enlarged sectional view of a block showing the vicinity of a holding portion of the optical fiber.

FIG. 11 is a view showing a cleaning microfilm.

FIG. 12 is a view showing another embodiment of the cleaning microfilm.

[Explanation of symbols]

 26 Microfilm 98 Frame detection unit 100, 102 Optical fiber holding block 104, 106 Optical fiber 108 Optical sensor 250, 250A Cleaning microfilm 252 Leader film 254 Tracer film 256, 256 Cleaning unit 258, 272 Cloth as cloth member

Claims (4)

[Claims] 1. A pair of optical fiber holding blocks traversing the microfilm in the width direction and facing both sides of the microfilm, and end faces of one ends penetrated and held by both blocks are opposed to each other across the microfilm. A plurality of optical fibers, a light source that guides light to an optical fiber held in one block, and a frame detection unit having an optical sensor that detects the amount of light incident on the optical fiber held in the other block, 2 which binarized the output of the optical sensor
A frame detection unit cleaning method applied to a microfilm search device that determines the presence or absence of a frame based on a value signal and performs a frame search, wherein both sides of a microfilm passing between the pair of optical fiber holding blocks are provided. Is provided with a cleaning unit having a soft and sufficiently thin cloth member, and by passing the cleaning unit between the blocks together with a microfilm, the end faces of the optical fibers facing the opposing surfaces of the two blocks are cleaned. A method for cleaning the frame detection unit of the microfilm search device. 2. A cartridge which is entangled and stored in a cartridge,
A cleaning microfilm for a microfilm retrieval apparatus, wherein a cleaning unit having both sides soft and sufficiently thin is provided between a trailer film on which a frame is imprinted and a leader film connected to the head of the trailer film. 3. The cleaning section is formed of a soft band-shaped cloth on both sides, and both ends of the cloth are smoothly connected to a leader film and a trailer film, respectively.
Microfilm for cleaning of microfilm search device of the. 4. The cleaning microfilm according to claim 2, wherein the cleaning unit is formed of a band-shaped cloth adhered to both sides of the base film.