JPH02161325A - Method for fixing optical fiber - Google Patents

Abstract

PURPOSE:To array optical fibers at correct intervals and to prevent cutting plane from inclining by disposing and holding the plural optical fibers to a jig so as to be spaced at the specified intervals, then adhering and fixing the fibers to a member for arraying and cutting the optical fibers. CONSTITUTION:The jig 16 is constituted by alternately arraying two sheets of partition plates 18 and three pieces of spacer plates 19 and sandwiching the outer sides thereof with both end spaces 21 to form three grooves 20. The optical fibers S are fitted by each turn into these three grooves 20 and a retaining fitting 15 coated with an adhesive agent is set in a notched groove 25. The optical fibers S are again fitted by each one turn into the three grooves 20 and the optical fibers S are adhered to the front and rear surfaces on the U-shaped central side of the retaining fitting 15. The adhesive agent is dried sufficiently and six pieces of the optical fibers S fixed to the retaining fitting 15 are cut at one time along one edge on the central side of the retaining fitting 15. Six pieces of the optical fibers S are cut in such a manner and are held fixed to the retaining fitting 15 in the state in which the end faces, i.e. cutting plane do not incline and the distance between the fibers do not fluctuate.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a method for manufacturing a photodetector, and more specifically, a method for manufacturing a photodetector, in which one end surface of a plurality of optical fibers for light transmission is arranged and fixed at regular intervals. Regarding technology.

(Prior Art) Photodetectors using photoelectric conversion elements are used in various fields. In order to ensure detection, it is conceivable to use a plurality of photoelectric conversion elements. If the object to be detected at this time is small, the parts that take in the light must also be arranged accurately at a small distance, and the end face of the optical fiber for light transmission should be used as the part that takes in the light. is possible.

FIG. 9 schematically shows a league printer, which is a conventional device equipped with a photodetector. This league printer is used for searching and copying microfilm. The microfilm F is wound, for example, into a roll on one reel 1, and is wound onto the other reel 3 through a film guide roller 2.2. This winding is microfilm F.
This is done by a capstan roller 4 for feeding the film which rotates while pinching the film, and a pinch roller 5 which rotates by pressing against the capstan roller 4. The capstan roller 4 is connected to a forward/reverse motor (not shown), and moves the microfilm F from one reel 1 to the other reel 3, and from the other reel 3 to one reel 1, depending on the rotational direction of the motor. send. The microfilm F thus fed is irradiated with light from the illumination lamp 6 via the condenser lens 7, and the image of the microfilm F resulting from this irradiation is magnified by the lens 8 and projected onto the screen 9. The microfilm F has image frames in which images are recorded and frame marks provided corresponding to each image frame in order to find a necessary image frame when searching for one image frame. A photodetector lO is provided to detect this frame mark. This photodetector IO contains a plurality of photoelectric conversion elements, and is provided on the surface of the microfilm F opposite to the illuminated surface at a position where the coma mark is present.

An enlarged view of the part where the optical fiber for light transmission of this photodetector lO is arranged is shown in Fig. 1θ. Fig. 10 (A) is a view seen from the direction of light irradiation, and CB) is ( A) B-B
FIG.

A block 11 is positioned along the feeding direction of the microfilm F, and optical fibers M S r * having a circular cross section are placed in circular through holes H1, H2, H3 provided in this block 11.
52, S3 is inserted into the tail. Optical m, *S
The end faces of I to S3 are opposed to the microfilm F so that light passing through the microfilm F can be captured. As mentioned above, the microfilm F has a plurality of image frames in which image information is recorded, and a frame mark m above or below each image frame (in the width direction of the microfilm F), and this frame mark m is exposed to light. By blocking, for example, the optical fiber 5l-33, a light signal is sent to the photoelectric conversion element. Three optical fibers are arranged at a predetermined distance in the film feeding direction.

The reason for arranging three optical fibers is that, for example, one of the three optical fibers detects the light, and the other two
This is because it is assumed that the frame mark m is detected when the frame mark m is not detecting light, that is, when the two are simultaneously blocked.

Note that the diameters of the through holes H1 to H3 are slightly larger than the diameters of the optical fibers #I m S + to S3 so that the optical fibers S1 to S3 can be fitted into the through holes H1 to H3.

(Problems to be Solved by the Invention) As described above, in the conventional technology, each optical mraS is
Since the optical fiber S is fitted into the through hole H having a diameter larger than the diameter d of the optical fiber, the optical fiber S is inevitably tilted inside the through hole H (see Fig. 10 (B)), and the end surface of the optical fiber S is tilted. was.

Therefore, if a photodetector having an optical fiber S with such an inclined end face is used in, for example, a league printer for microfilm, the end face will not be parallel to the film F, and a coma mark will appear at the tip of the inclined optical fiber. The frame mark could not be detected correctly even when the frame marks approached, or the detection timing would be delayed.Due to the large diameter of the through-hole H, the optical fibers ms not only tilted, but also each optical fiber S Since the distance between the end faces of the microfilm varies, the timing of detection is shifted, and the position at which the microfilm is stopped during a search may shift.

In order to solve this problem, conventional attempts have been made to reduce the diameter of the through hole H of the block 11 as much as possible.Normally, the diameter d of the optical fiber S is 0.25 layers;
In order to open the through hole H having a small diameter d corresponding to such small dimensions, electric discharge machining using a special electrode is required instead of ordinary drilling. In order to open a plurality of through holes H, one electrode is required for each through hole H, and the cost of the device for opening the holes becomes extremely high. Furthermore, the assembly work of fitting the optical fiber S into the through-hole H is extremely difficult because the diameter of the through-hole H is minute and the difference between this D and the diameter d of the optical fiber is small, which reduces productivity. It became a big problem from the front.

The present invention has been made in view of the above-mentioned problems, and is an optical fiber #I that can prevent the end faces of arranged and fixed optical fibers from being tilted and the distance between the end faces from varying, and can improve productivity.
The purpose is to obtain a method for fixing ta.

(Means for Solving the Problem) In order to achieve the above object, the present invention provides optical fibers that connect one end of a plurality of optical fibers to a photoelectric conversion element after arranging and fixing one end of a plurality of optical fibers at regular intervals. In the fixing method, the plurality of optical fibers are held at regular intervals with a jig, then fixed to an arraying member with an adhesive, and cut near the arraying member.

(Function) Since the optical fibers are held in a jig in advance and fixed to an arrangement member with adhesive before being cut, the cross section of the optical fibers has almost no inclination as a cut surface. At the stage of holding the optical fibers, the distances between the optical fibers can be made the same, and variations in the distances between the optical fibers can be eliminated. Since there is no need to drill through holes in the block by electric discharge machining using a dedicated electrode as in the past, the work cost can be reduced and productivity can be improved.

(Example) An example of the present invention will be described below with reference to FIGS. 1 to 8. The photodetector shown in FIG. 10 explained as a conventional example had three optical fibers, but the photodetector to be manufactured in this embodiment has six optical fibers as shown in FIG. It has optical fibers. That is, by providing two sets of three optical mmI arranged in the feeding direction of the microfilm F: one above the other in the figure, the frame mark m to be detected can be detected.
The aim is to perform more accurate detection even if the position of the sensor changes up or down.

The microfilm F of this embodiment shown in FIG. 8 is a negative film, and the image portion within the image frame lz is transparent and the background is opaque.

Further, the frame mark m is opaque, and the blank area 13 other than the frame mark m and the image frame 12 is transparent. However,
Also in this invention, a positive film can be used instead of a negative film.

As is well known, a positive film has transparent and opaque parts that are opposite to those of a negative film; the blank area 13 is opaque, and the background and frame mark m within one image frame 12 are transparent. A portion of the photodetector 10 that captures light is located at a position where the frame mark m passes as the microfilm F is fed. As shown in the figure, the end faces of six optical mfaSt-36 are arranged in the part that takes in this light. That is, three microfilms F are lined up in the feeding direction, and two sets are arranged in the vertical direction. The end faces of these optical edges mS are located on the opposite side of the illumination lamp 6 (see FIG. 9) with the microfilm F in between. As a result, the light from the illumination lamp 6 is interrupted by the frame mark m, so that
Light taken in from the end face of the optical a#ls becomes an optical signal, is transmitted within the optical edge #IS, and is sent to the photoelectric conversion element.

Next, each optical edge arranged in 6 pieces! The S-cutting of the end face of 151-36 will be explained. As shown in FIG. 8, the optical edge exists on the downstream side of the microfilm F in the feeding direction! iS
+, when S4 is still receiving light through the blank space 13, the central optical fiber S2. S5 is a comma mark m
When the light is blocked by the frame mark m, the frame mark m is detected. Upstream optical edge 11k S 3 , S
6 is the central optical fiber s2. s5 is microfilm F
This is to prevent dust or the like attached to the frame mark m from being mistakenly detected as the frame mark m, and is placed at an arbitrary position where light is blocked by the frame mark m in the state shown in the figure. However, without using the upstream optical edges M S 3 , S b , one optical fiber set consists of two optical fibers 51154 or s4.s4 arranged in the feeding direction of the film F. s5, in which case a total of four optical fibers will be used.

This embodiment is used to arrange and fix the end faces of the six optical fibers described above. That is, in the end, the end faces of the six optical edges Ji S 1 to S6 are placed above and below the center side of the U-shape of the retaining metal fitting 15 (see FIG. 5), which is a member for arranging and has a substantially U-shaped cross section. The optical fibers S are arranged in groups of three and fixed with adhesive.

A jig for this purpose is shown in Figs. 1 to 3. Fig. 1 is a perspective view showing the state in which the optical fiber is held in the jig, and Fig. 2 is an exploded view of the jig shown in Fig. 1. FIG. 3 shows a sectional view taken along the line ■--■ in FIG. 1.

As shown in FIG. 2, the main body 17 of the jig 16 has a generally short cylindrical shape, and a portion thereof is cut out in a roughly half-moon shape. In this cutout, two partition plates 18 and three spacer plates 19 are alternately arranged to form three grooves 20 (see FIG. 3). That is, the two partition plates 18 are
It is arranged between the three grooves 20 and partitions the three grooves. The three spacer plates 19 constitute the bottom of each 1s20, and the plate thickness is slightly larger than the diameter of the optical fiber #IS.
The thickness of the partition plate 18 has a dimension that determines the distance between the optical fibers and the aS. Both end spacer plates 21 are sandwiched from both sides of these partition plates 18 and spacer plates 19, and the outer sides thereof are further sandwiched between the jig main body 17 and the holding plate 22. These members have a common screw hole 23.
is penetrated, and the whole is fixed to the jig main body 17 with screws 24. Also, the partition plate 18. Spacer 19. The spacer plate 21 at both ends has a cutout groove 2 in a direction perpendicular to the groove 20.
5 is formed, and a presser fitting 15, which is an arrangement member for fixing the optical mms with adhesive, is fitted into this notch groove 25. Note that the jig main body 17 includes a leaf spring 27 having a rubber plate 26 at its tip.
It is attached with screws 28.

As shown in FIG. 1 for the jig 16 configured as described above, first, the tip of one long optical fiber @S is clamped to the rubber plate 26 of the leaf spring 27, and then One turn is fitted into each of the three grooves 20 so as to be wound in the same direction. Thereafter, the presser metal fitting 15 coated with adhesive is set in the notch groove 25 (see Fig. 1). The adhesive is applied to the upper and lower surfaces of the U-shaped center side of the presser metal fitting 15. . After that, the optical fiber #l:S is wound again and fitted into each of the three grooves 20 one turn at a time. Clamp. after that.

After the adhesive on the presser fitting 15 has sufficiently dried and the optical fiber #IS is fixed to the presser fitting 15, six optical fibers S are attached at once along one edge of the center side of the presser fitting 15. disconnect. As a result, the end faces, which are the cut surfaces of the six optical fibers, are accurately fixed to the presser fitting 15 without being tilted and without any variation in mutual distance. In this way, the arrangement and fixation of the optical fiber end faces by the method of this embodiment is completed.

Holder metal fitting 1 with six optical fibers fixed in this way
5 is further attached to a holding member 31 as shown in FIG. This holding member 31 is attached to a mark detector 10 which is a photodetector shown in FIG. That is, this mark detector IO has a substantially box-shaped substrate 33 with a window 32 on one side. The holding member 31 is attached to the edge of this window 32, and six optical fibers are arranged, II S t to S
The end face of 6 faces toward the window 32. The other ends of the six optical fibers 51 to S6 are connected to six photoelectric conversion elements Dl.
Each is connected to #D6. These photoelectric conversion elements D+
``D6 is provided at the edge of the substrate 33.As the microfilm F is fed outside the window 32, the frame mark m is placed on the end face of the six optical fibers!l S1 to S6. This means that the frame mark m can be detected by passing through the position.

Next, in FIG. 7, the control circuit of the mark detector, which is the photodetector of this embodiment, will be explained. 43.44 is an inverter, 45.46 is an AND gate, 47 is an OR gate, 48
49 is a counting circuit that adds or subtracts the frame signal output from the OR gate 25 depending on the film feeding direction; 49 compares the frame number stored in the memory circuit 42 with the counted value of the counting circuit 48; A comparator circuit 50 outputs a stop signal when they match, and a brake device 5 50 stops the motor 51 that drives the capstan roller 3 and stops the rotation of the capstan roller 4 (see FIG. 9) when the stop signal is received.
This is a drive control circuit that operates 2.

The counting circuit 48 is switched to an addition or subtraction state depending on the microfilm feeding direction. Sensor D (referring to photoelectric conversion element DI-D6, the same applies hereinafter), 13.16 outputs a low level signal when the light transmitted through the blank area 13 (FIG. 8) of the microfilm F is incident. Sensor D2.
D3 and D5. D6 outputs a high level signal when the light incident on these sensors is blocked by the comma mark m.

When the frame number of a desired image to be searched is input into the input device 41 and a search start command is issued, the motor 51 is activated and the microfilm F is fed by the capstan roller 4. When the microfilm F is fed and the transmitted light from the blank area enters the sensor D1, and the light input to the sensors D2 and D3 is blocked by the frame mark m, AND
A high-level signal is input to the input terminals 451, 452, and 453 of the gate 45 to open the AND gate 45, and a high-level signal is input to the input terminal 471 of the OR gate 47 to open the OR gate 47. The frame signals output from the gate 47 are added or subtracted by a counting circuit 48. The same goes for the sensor rows D 4 + D 5 + D6, where the transmitted light from the blank area is incident on the sensor D4, and the sensor D5. When the light incident on D6 is blocked by the comma mark m, the input terminals 481 and 46 of the AND gate 46
A high level signal is input to the input terminal 472 of the OR gate 47, the OR gate 47 is opened, and the frame signal output from the OR gate 47 is sent to the counting circuit. 48 is added or subtracted. When the count value of the counting circuit 48 and the frame number stored in the memory circuit 42 match, a stop signal is output from the comparison circuit 49, the motor 51 is stopped via the drive control circuit 50, and the plagiarion M52 is activated. Then, feeding of the microfilm F is stopped and the desired image is searched.

As described above, six sensors (photoelectric conversion elements) are provided, and the end face of the optical fiber S that takes in light to each sensor is arranged in two sets in the film feeding direction, three in each set, and the OR output of each sensor is By using the frame mark search signal, the eighth
As shown in the figure, even if the digit t of the frame mark m varies from frame to frame in the width direction of the film F, the film search can be performed more reliably.

In one or more embodiments, an example has been described in which two sets of six optical fibers S are arranged in groups of three, but in other embodiments, only one set of a plurality of optical fibers @S is arranged. In this case, if the number of optical fibers is three, the optical fibers shown in FIG. 10 as a conventional example can also be arranged and fixed by the method of the present invention.

In addition, in the above embodiment, an example was explained in which the optical fiber is wound and held in three grooves of the jig as shown in FIG. As shown, the optical fibers S may be held through six holes in the jig.

That is, as shown in the figure, two holding plates 61.6, which are jigs,
2 facing each other with a gap in between, and pass the optical fibers S through six holes provided at corresponding positions.At this time, the positions of the six holes are the positions where the optical fibers S are finally arranged and fixed. That is, after passing the optical fiber through the lower three holes among the six holes, a presser metal fitting 15 similar to that shown in FIG. 3 of the previous embodiment is set. At this time, the upper and lower surfaces of the U-shaped center side of the presser metal fitting 15 are coated with adhesive in the same way as in the previous embodiment. The optical fibers S are passed through, and after the adhesive is dried and fixed, the six optical fibers S are cut along one edge of the center side of the presser metal fitting 15. This also makes it possible to obtain the same effects as in the embodiment described above.

(Effects of the Invention) As explained above, after arranging and holding a plurality of optical fibers at regular intervals on a jig, adhesively fixing them to an arrangement member, and then cutting the optical fibers, it is possible to Since the optical fibers are already arranged and fixed at regular intervals, the arrangement is done at the correct intervals and at the same time, the end face, which is the cut surface, is not inclined. There is no need to fit the end of the optical fiber into the through hole, and therefore there is no need to form a highly accurate through hole in the block, and manufacturing costs can be reduced.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a jig used in an embodiment of the present invention, Fig. 2 is an exploded view of the jig shown in Fig. 1, and Fig. 3 is an exploded view of the jig shown in Fig. 1.
4 is an explanatory diagram illustrating the second embodiment of the present invention; FIG. 5 is a perspective view showing the state of the optical fibers arranged and fixed to the presser fitting as shown in FIG. 3; FIG. 6 is a diagram showing an example of the photodetector using the optical fiber shown in FIG. 5, FIG. 7 is a block diagram showing a control circuit of the mark detector which is the photodetector shown in FIG. 6, and FIG. Fig. 6 is a diagram for explaining the function of the mark detector, which is a photodetector, detecting frame marks on microfilm, and Fig. 9 is an overall schematic diagram showing a microfilm glue printer having a conventional photodetector. , FIG. 10(A) is a front view of the photodetector in FIG.
Figure 10 (CB) is a sectional view taken along line BB in Figure 10 (A). Explanation of symbols 15... Holding metal fitting (member for arrangement) 16... Jig 18... Partition plate 20... Groove 22... Holding plate 25... Notch groove 27... Leaf spring 17...Jig main body 19...Spacer 21...Both end spacer plates 24...Screws 26...Rubber plate S...Optical fibers Figure 7 Figure 5 Figure 6 Figure 8 Figure 9

Claims (3)

[Claims] (1) In an optical fiber fixing method in which one end of a plurality of optical fibers is arranged and fixed at regular intervals, and the other end is connected to a photoelectric conversion element, the plurality of optical fibers are fixed using a jig. A method for fixing optical fibers, which comprises holding the optical fibers at intervals, fixing them to an arraying member with an adhesive, and cutting the optical fibers near the arraying member. (2) The method for fixing optical fibers according to claim 1, wherein the jig is provided with a plurality of grooves for holding the optical fibers. (3) The method for fixing optical fibers according to claim 1, wherein the jig is provided with a plurality of holes into which optical fibers are inserted and held.