JPH11142965A - Microfilm retrieval device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a device compact, to prevent light quantity guided to plural optical fibers from being changed when the device is disassembled, inspected and maintained and to enhance the detecting accuracy of a frame by focusing the end parts of the plural optical fibers and holding the focused part so that it can be attached and detached with respect to one lamp and it cannot be rotated. SOLUTION: The focused part 104A of the optical fibers 104 is inserted in a plug 258 from a grip part 258B side and fixed by filling an adhesive agent filling part 260 with adhesive agent. On a condition that the plug 258 is inserted in a socket 252 fitted to the outside wall 56C of a box-like reflection plate 56 and a pawl 252D is engaged in a ring-like groove 258C, the rotation of the plug 258 is regulated because a projection 258E is engaged in a recessed part 252E. Then, one part of light emitted from the lamp 54 is reflected on the plate 56 and passed through small holes 56B and 254B. Besides, it enters the optical fibers 104.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a microfilm search apparatus for judging the presence or absence of a frame from a change in density of a microfilm in a running direction.

[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 this case, it is conceivable to provide a plurality of pairs of optical fibers for detecting the film density at different positions in the width direction of the film, and to judge the presence or absence of a frame by using the results detected at the plurality of different positions. For example, when the frame position in the film width direction changes due to a change in the film shooting method, the optical fiber used may be changed. Further, by judging the presence or absence of a frame using the film density detected at a plurality of positions in the running trajectory of the frame, the determination accuracy can be improved.

As described above, when judging the presence or absence of a frame at a plurality of positions in the film width direction, it is necessary to make the frame detection conditions of a plurality of pairs of optical fibers uniform. For example, frame detection conditions change due to changes in the amount of light guided from a light source to each pair of optical fibers, attenuation characteristics of optical fibers, characteristics of optical sensors, threshold values for binarizing outputs of optical sensors, and the like. It is necessary to keep these conditions as constant as possible.

However, providing a separate light source lamp for each optical fiber increases the size of the apparatus. In addition, it is difficult to keep the light intensity of all the lamps constant at all times, and the conditions are not uniform even when replacing the lamps. Furthermore, it is conceivable that light from one common lamp is incident on the end face of each optical fiber on the light source side. However, if these optical fibers are separated from the lamp once during inspection and maintenance of the equipment, the light will be lost when reassembled. The positions of the fibers change. For this reason, the amount of light incident on each pair of optical fibers changes, and the detection condition of the frame changes, which causes a problem that the frame detection accuracy decreases.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and has been made to reduce the size of an apparatus and to prevent a change in the amount of light guided to a plurality of optical fibers during disassembly, inspection, and maintenance of the apparatus. It is another object of the present invention to provide a microfilm search device capable of improving frame detection accuracy.

[0009]

According to the present invention, an object of the present invention is to provide a microfilm search apparatus which determines the presence or absence of a frame based on a change in density in the running direction of a microfilm. A pair of optical fiber holding blocks facing each other, an optical fiber that is penetrated by each of the two blocks, and an end face of one end that faces each other with the microfilm sandwiched at different positions in the film width direction; A light source for guiding light to the fiber, an optical sensor for detecting the amount of light incident on the optical fiber held by the other block, a binarizing unit for binarizing the output of the optical sensor, A plurality of optical fibers on the light source side are focused at the light source side end, and the plurality of optical fibers on the light source side are focused. There microfilm search device characterized in that it is detachably and non-rotatably held relative to one lamp, it is achieved by.

Here, as the light source lamp for guiding light to the converging portion of the optical fiber, a lamp of a light source for image projection can be used. The focusing portion can be inserted into and fixed to a substantially cylindrical plug, and the plug can be made non-rotatable and detachable from a substantially cylindrical socket provided coaxially with a small hole provided in the reflector. It is desirable that the reflector is formed in a substantially box shape surrounding the lamp, and a light shielding plate is provided between the lamp and the small hole so that the direct light of the lamp does not enter the optical fiber.

[0011]

FIG. 1 is a view showing a use state of one embodiment of the present invention, FIG. 2 is a perspective view showing the inside of a scanner used here, FIG. 3 is a side view showing an arrangement of main parts of the scanner, and FIG. 5 is a perspective view showing a line sensor driving unit, FIG. 5 is a diagram showing a main part, and FIG. 6 is a diagram for explaining an arrangement of optical sensors.

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.

Reference numeral 52 denotes a light source for projecting an image, which is accommodated in the space 38 between the reel driving units 30 and 32.
It has a lamp 54, a reflector 56, a condenser lens 58, an appropriate filter, and the like. In FIG. 2, reference numeral 60 denotes a power supply circuit unit,
Reference numeral 62 denotes a power control circuit unit 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 frames will be described with reference to FIG. The upstream side of the image reading position of the microfilm 26, that is, the position of the optical axis 74 (the supply reel 24A side)
The film 26 is traversed in the width direction and the film 26
A pair of optical fiber holding blocks 100 and 102 facing each other with a slight gap therebetween are provided. Nine optical fibers 104 and 106 arranged in the film width direction are inserted through these blocks 100 and 102. The structure of these blocks 100 and 102 will be described later.

The optical fibers 104 and 106 are held perpendicular to the film 26, and their 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. The light source 52 will be described later.

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 L orthogonal to the running direction of the film 26 and have different positions in the width direction of the film 26. It is in. In this embodiment, since the optical sensor 108 detects the amount of light incident on the optical fiber 106, the end face of the optical fiber 106 is substantially
This is the same as the case where the optical sensor 108 is located at a position opposing to. 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 unit 112 determines the presence or absence of a frame using the binarized signals output from the eight binarization units 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 determination may be made using a logical product or a 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 a 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 output of each of the three optical sensors 108D and 108E passing within the width of the upper and lower channels except for the output of the optical sensor 108C. I do.

FIG. 6C shows a 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.

Blocks 100 and 102 having exactly the same structure are used in combination by inverting each other. 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 length direction of the two blocks 100 and 102, the nine optical fibers 104 and 106 are straight lines L.
It is held at a predetermined interval above (see FIGS. 6A and 7B). Here, the optical fibers 104 and 106 are covered with a resin 202 as shown in FIG. The optical fibers 104 and 106 are exposed by peeling off the resin 202 at one end by a predetermined length, pass through the holding holes 204 formed in the blocks 100 and 102, and are fixed to the blocks 100 and 102 by the adhesive 206. And the light guide section 20
At 0, the end surface is polished together with the surfaces of the blocks 100 and 102 to make 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, based on FIG.
A light source for guiding light to the light source will be described. In this embodiment, a light source for image projection is also used as a light source for guiding light to the optical fiber 104. That is, the light source of the optical fiber 104 is a lamp 54 of an image projection light source unit, and a light shielding plate 56 that blocks direct light incident on the optical fiber 104 from the lamp 54.
A and a reflecting plate 56 for guiding the reflected light of the lamp 54 to the optical fiber 104.

In this embodiment, the reflector 56 of the lamp 54 is formed in a box shape as shown in FIG.
A small hole 56B is formed in one wall surface. The ends of the nine optical fibers 104 are converged, and the end surface of the converging portion 104A is held so as to face the inside of the box-shaped reflecting plate 56 from outside the small hole 56B. Further, the light shielding plate 56A prevents the light of the lamp 54 from directly entering the small hole 56B in this box.

Next, the mounting portion 250 for holding the converging portion 104A of the optical fiber 104 on the reflector 56 of the light source 52 will be described. FIG. 12 is a sectional view of a main part showing the mounting portion 250, and FIG. 13 is an exploded perspective view of the same. In these figures, reference numeral 252 denotes a substantially cylindrical socket, and this socket 252 is provided with a box-shaped reflecting plate 5 by a socket holder 254.
6 attached to the outer wall 56C.

The socket 252 is formed by integrally molding an inner cylinder 252A and an outer cylinder 252B as shown in FIG. 12, and a pair of claws 252C, 25 provided on the outer cylinder 252B.
2C is provided with an engagement hole 254 provided in the socket holder 254.
A, 254A is attached to the socket holder 254 by engaging. At this time, the socket 252 is perpendicular to the socket holder 254, and the inner cylinder 252A is located coaxially with the small hole 254B formed in the socket holder 254.

The socket holder 254 is formed by bending an upper portion of a flat plate at a right angle and bending a lower portion into a crank shape. This socket holder 254 has a square hole 254C
Is made to enter the window 56D provided in the outer wall 56C, and then the entire socket holder 254 is pushed down to engage the square hole 254C with the claw 56E protruding from the lower edge of the window 56D. The lower part of the socket holder 254 is the outer wall 5.
6C, and is fixed to the outer wall 56C by the screw 256. At this time, the socket 252, the small hole 254B, and the small hole 5
6B is located coaxially.

The plug 258 is attached to and detached from the socket 252 attached to the outer wall 56C in this manner. Plug 25
8 has a substantially cylindrical shape, and the leading side is a small-diameter insertion portion 258A, and the opposite side is a large-diameter grip portion 258B.
The converging portion 104A of the optical fiber 104 is inserted into the plug 258 from the grip portion 258B side, and is fixed by filling the adhesive filling portion 260 with an adhesive.

An optical fiber 1 is provided at the distal end surface of the insertion portion 258A.
The end surface of the converging portion 104A of the substrate 04 faces and is polished flat. The insertion portion 258A is the inner cylinder 25 of the socket 252.
2A, it is detachably and non-rotatably held. That is, an annular groove 258C is formed on the outer periphery of the insertion portion 258A.
Is formed on the inner peripheral surface of the inner cylinder 252A on the socket 252 side, and one or a plurality of claws 252D having a return behavior in the inner diameter direction are formed.
By engaging with 8C, the plug 258 is detachably held.

A flange 258D formed on an edge of the grip portion 258B on the side of the insertion portion 258A is provided with one projection 258E in the outer diameter direction. A recess 252E is formed therein. Therefore, when the plug 258 is inserted into the socket 252 and the claw 252D is engaged with the annular groove 258C, the projection 258E is engaged with the concave portion 252E, and the rotation of the plug 258 is restricted.

For this reason, a part of the light of the lamp 54 passes through the condenser lens 58 and the film 26 as described above.
And a part of the light from the lamp 54 is also reflected by a box-shaped reflector 56, passes through the small holes 56B and 254B, and enters the optical fiber 104. Since the light entering the optical fiber 104 is reflected light by the reflection plate 56, the light from the lamp 5
4, the light path length is increased, and the lamp 54 is
4 is substantially far from the end face. For this reason, the light of the lamp 54 is incident on the optical fiber 104 after being repeatedly reflected in the reflection plate 56 in a complicated manner. As a result, the light incident on the optical fiber 104 is equalized and becomes closer to parallel light.

Also, since the plug 258 to which the converging portion 104A of the optical fiber 104 is fixed is held so as not to rotate with respect to the socket 252, even when the plug 258 is pulled out from the socket 252 for inspection and maintenance, the plug 258 is re-opened. During assembly, the positioning of the plug 258 in the rotational direction is always constant. Therefore, the positions of the nine optical fibers 104 collected by the focusing unit 104 with respect to the lamp 54 do not change, and the amount of incident light on each optical fiber 104 does not change.

FIG. 14 is a cross-sectional view of a main portion showing another embodiment of the mounting portion for holding the optical fiber 104 on the reflection plate 56. The mounting portion 300 is configured such that the socket 302 is a screw 304,
A ball plunger 306 is provided on the inner peripheral surface of the socket 302 for holding a ball having a radially protruding property, while the ball plunger 306 is fixed to the socket holder 254 at 304 and the ball is provided in the annular groove 31 provided in the insertion portion 310A of the plug 310.
OB was disengaged. Also, a concave portion 310 provided in a flange portion 310D of a grip portion 310C of the plug 310.
E engages with the protrusion 302A protruding from the socket 302 side.

Therefore, the plug 310 can be attached to and detached from the socket 302. At the time of attachment, the recess 310E and the projection 302A engage, and the plug 310 is positioned in the rotational direction. Therefore, even if the plug 310 is attached or detached, the relative position of the end face of the optical fiber 104 with respect to the lamp 54 does not change, and the incident light amount of each optical fiber 104 does not change. In FIG. 14, the same portions as those in FIG. 12 are denoted by the same reference numerals, and the description thereof will not be repeated.

The nine optical fibers 104 held in the block 100 have the same length, and the nine optical fibers 106 held in the block 102 have the same length. For this reason, the conditions of each pair of the nine optical fibers 104 and 106 are made uniform, and the accuracy of frame detection is improved.
Further, since the reflecting plate 56 is formed in a box shape, the lamp 54
Light is reflected repeatedly in this box in an intricate manner,
Accordingly, the incident light on the optical fiber 104 is further uniformized.

In this embodiment, since the density sensors (optical sensors) are arranged on a straight line L orthogonal to the film running direction, the presence or absence of a frame can be detected at the same timing in terms of 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. .

[0060]

As described above, according to the first aspect of the present invention, a plurality of optical fibers on the light source side are focused at the light source side end, and this focusing portion is detachably and non-rotatably attached to one light source lamp. Since the lamp is held, one lamp is sufficient, and the apparatus can be downsized compared to a case where a light source lamp is provided for each optical fiber. In addition, during assembly, inspection and maintenance, the relative position between the end face of each optical fiber of the converging section and the lamp does not change, so that it is possible to prevent a change in the amount of light guided to each optical fiber and to improve the detection accuracy of the frame. be able to.

In this case, if the optical fiber light source lamp is also used as the image projection lamp, the size of the apparatus can be further reduced (claim 2). If the converging portion of the optical fiber is inserted into and fixed to the plug and the plug is detachably and non-rotatably held in the socket, the plug can be easily attached and detached, and the device can be assembled, disassembled, and inspected. -Convenient for maintenance etc. (Claim 3). Further, the lamp for projecting an image is surrounded by a box-shaped reflector, and the end face of the light-collecting portion of the optical fiber faces the small hole provided in the box-shaped reflector, and a light-shielding plate is provided between the small hole and the lamp. Is provided to prevent the direct light of the lamp from being incident on the optical fiber, the light incident on each optical fiber can be further homogenized (claim 4).

[Brief description of the drawings]

FIG. 1 is a diagram showing a use state of an embodiment of the present invention.

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 bottom 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 sectional view showing an embodiment of a light source unit.

FIG. 12 is a cross-sectional view showing an attachment portion of the optical fiber focusing portion.

FIG. 13 is an exploded perspective view of the mounting portion.

FIG. 14 is a cross-sectional view showing another embodiment of the attachment portion of the optical fiber focusing portion.

[Explanation of symbols]

 26 Microfilm 52 Image projection light source 54 Lamp 56 Reflector 56A Light shield 56B Small hole 100, 102 Optical fiber holding block 104, 106 Optical fiber 104A Focusing unit 108 Optical sensor 110 Binarization unit 112 Judgment unit 114 Sensor selection unit 116 Search unit 250, 300 Mounting unit 252, 302 Socket 252E, 310E Recess 254 Socket holder 254B Small hole 258 Plug 258E, 302A Projection

Claims (4)

[Claims] 1. A microfilm search apparatus for determining the presence or absence of a frame from a density change in a running direction of a microfilm, comprising: a pair of optical fiber holding blocks that cross the microfilm in a width direction and face both sides of the microfilm. An end face of one end penetrated and held in both blocks respectively opposes each other with the microfilm sandwiched at different positions in the film width direction, a light source for guiding light to the optical fiber held in one block, and the other. An optical sensor for detecting the amount of light incident on the optical fiber held by the block, a binarizing unit for binarizing the output of the optical sensor, and determining whether or not a frame exists based on the binarized signal. A plurality of optical fibers on the light source side, the light source side ends of which are focused, and this focusing portion is attached to and detached from one lamp. Microfilm searching apparatus characterized by being ability and non-rotatably held. 2. The microfilm search apparatus according to claim 1, wherein the one lamp is a lamp of a light source for projecting a microfilm image. 3. A substantially cylindrical socket coaxially fixed to a small hole formed in a reflector of a lamp, and a substantially cylindrical plug detachably and non-rotatably mounted on the socket from the outside. The microfilm search device according to claim 1, wherein the focusing unit is inserted through and fixed to the plug. 4. The reflector is formed in a box shape surrounding the lamp,
4. A light shielding plate is provided between the small hole and the lamp to prevent direct light of the lamp from entering the small hole.
Microfilm search device.