JPH04350836A - Detecting device - Google Patents

Abstract

PURPOSE:To prevent dust from entering the internal part of a device main body via a light outgoing port 52. CONSTITUTION:In the detecting device on which the device main body 51 whose inside is hollow is formed, a light entering port 52 and the light outgoing port 53 for dividing the internal part 80 of the device main body 51 from the outside, is provided on the device main body 51, the light entering port 52 is closed by the bottom plate glass 28, and simultaneously, an optical fiber 29 detecting illuminating light 61 made incident on the internal part 80 of the device main body 51 via the light entering port 52 is housed on the internal part 80 of the device main body 51, the light outgoing port 53 is closed by a glass cover 36.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a detection device used in an image frame search section of a microfilm reader printer.

0002

2. Description of the Related Art FIG. 5 is a cross-sectional view showing the internal structure of a conventional detection device, ie, a mark detector 107. The mark detector 107 includes a hollow device body 109, and a light entrance 110 is provided in the lower part of the device body 109 facing the transport path 104. This light entrance 110 is provided with a light-transmitting member, that is, a guide glass 112. Further, a light exit port 111 is provided above the device main body 109.

A detecting means, ie, an optical fiber 113 is housed in the interior 120 of the apparatus main body 109, and the light receiving surface 116 at the tip is brought into close contact with the guide glass 112. A photoelectric conversion element 114 is provided on the outer surface of the device main body 109, and an output side end 115 of an optical fiber 113 is connected to the photoelectric conversion element 114. Further, below the mark detector 107, there is provided a pressure plate glass 116 that moves in the direction of arrow A, contacts and separates from the guide glass 112, and presses the microfilm 100 against the guide glass 112.

In the above configuration, the microfilm 100 being transported is illuminated with illumination light B from a lamp (not shown), and the optical fiber 113 receives the illumination light B transmitted through the guide glass 112. Then, the mark detector 107 detects the mark 117 by intermittent illumination light by the mark 117 provided corresponding to the image frame of the microfilm.

[0005]

[Problems to be Solved by the Invention] However, in the above-mentioned conventional example, since the light exit port 111 is open so that the illumination light B can pass through, dust existing outside the main body 109 of the device may interfere with the light exit port 111. The light receiving surface 116 of the optical fiber 113 enters the inside 120 of the device main body 109 through the
and the guide glass 112. As a result, there was a possibility that the illumination light B would be blocked by the invading dust and the detection function would deteriorate.

The above problem can be solved by cleaning the inside 120 of the device main body 109, but cleaning itself is troublesome, and there is a risk of damaging the optical fiber 113 (particularly the light receiving surface 116), which may actually hinder the detection. This results in a decline in functionality.

The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a detection device that can prevent dust from outside the device main body from entering the inside of the device main body through the light exit port.

[0008]

[Means for Solving the Problems] In order to achieve the above object, the present invention forms an internally hollow device body, and has a light inlet and a light outlet in the device body to partition the inside and outside of the device body. a detection device, the light input port being closed with a first light-transmitting member, and detecting means for detecting light entering the device main body through the light entry port inside the device main body; , the light exit port is closed with a second light-transmitting member.

[0009]

[Operation] The operation of the present invention based on the above structure is such that light enters the inside of the device main body through the light entrance and exits to the outside of the device main body through the light exit port. The detection means detects the light that has entered the main body of the device.

[0010] Since the light entrance is closed by the first light-transmitting member, and the light exit is sealed by the second light-transmitting member, dust from outside the device main body can enter the inside of the device main body through the light exit port. Never.

[0011]

Embodiments Next, embodiments of the present invention will be described based on the accompanying drawings. FIG. 2 shows a schematic configuration of a microfilm reader printer equipped with a detection device according to the present invention. In the figure, reference numeral 1 denotes a long microfilm, and marks 1b are provided on the side edges of image frames 1a on the microfilm 1. 2 is a removable film supply cartridge that stores the microfilm 1 in the form of a roll; 6 is a capstan roller for feeding out the microfilm 1 in the cartridge 2; 5 is a feeding motor that rotates the capstan roller 6; A film winding motor (driving means) 7 for rotating a film spool (not shown) in the cartridge 2 moves the capstan roller 6 into a position where it contacts the microfilm 1 and a position where it separates from the microfilm 1. This is a solenoid that is moved via the support arm 8.

9 and 10 are film guide rollers, 13
12 is a film take-up reel; 12 is applied pressure toward the take-up shaft 13a of the take-up reel 13 by a spring 12a, and is used to securely wind the tip of the microfilm 1 around the take-up shaft 13a of the take-up reel 13; It is a guide roller.

Reference numeral 4 denotes a film take-up motor for rotating the take-up reel 13. Although not shown, a guide plate is provided for guiding the microfilm 1 along a predetermined film feeding path between the cartridge 2 and the take-up reel 13.

In the above configuration, when the delivery motor 5 is driven and the solenoid 7 is activated, the capstan roller 6 rotates and moves to a position where it contacts the microfilm 1, causing the capstan roller 6 to come into contact with the microfilm 1. The leading end of the microfilm 1 is sent out from the cartridge 2, and the microfilm 1 is fed toward the take-up reel 13 along a predetermined path. When the leading edge of the microfilm 1 passes through the guide roller 9,
A film detector (not shown) detects the microfilm 1, and this detection signal drives the take-up motor 4, causing the take-up reel 13 to rotate.

[0015] The tip of the microfilm 1 is the take-up reel 1.
When the microfilm 1 is fed up to 3, the leading edge of the microfilm 1 is moved to the take-up shaft 13 of the take-up reel 13 by the action of the guide roller 12.
Automatically wraps around a. When the microfilm 1 is wound around the take-up reel 13, the rewind motor 3 and solenoid 7 become inactive, and the capstan roller 6
move away from it and return to its original position. When the tip of the microfilm 1 is wound around the take-up reel 13, the microfilm 1
is transferred from the cartridge 2 to the take-up reel 13 as the take-up reel 13 rotates. When rewinding the microfilm 1 into the cartridge 2, the take-up motor 4 is deactivated and
When the rewind motor 3 is driven, a film spool (not shown) in the cartridge 2 rotates in a direction to wind the microfilm 1, and the microfilm 1 is rewound into the cartridge 2. Therefore, by driving either the motors 3 or 4, the microfilm 1 can be wound up or rewound.

Further, below the transport path 50 for the microfilm 1 formed between the guide rollers 9 and 10, a lamp 14 for illuminating the microfilm 1 and a condenser lens 1 are installed.
On the other hand, above the conveyance path 50, a lamp 1 is provided.
A projection lens 16 is provided for projecting the image of the microfilm 1 illuminated by the microfilm 1 through a reflection mirror 17 onto a screen 18 or through reflection mirrors 19 and 20 onto a photosensitive drum 30 in an enlarged manner. Furthermore, the conveyance path 5
A detection device, that is, a sensor unit 11 is provided above 0, that is, between the conveyance path 50 and the projection lens 16.

FIG. 1 is an enlarged side sectional view showing the main parts of the sensor unit 11, and FIG. 3 is a plan view showing the internal structure of the sensor unit 11. The sensor unit 11 includes a lower base 34 located on the conveyance path 50 side and a projection lens 16.
It has an internal hollow device main body, that is, a unit main body 51, which is overlapped with a cover 35 located on the side. A light entrance 52 is provided in the lower base 34 on the optical axis connecting the lamp 14 and the projection lens 16, and a light exit port 53 is provided in the cover 35. In this way, the inside 80 and the outside of the unit main body 51 are partitioned.

Further, a first light-transmitting member, ie, a lower plate glass 28, is fixed to the light entrance 52, and a second light-transmitting member, ie, a cover glass 36, is fixed to the light exit port 53. The lower glass plate 28 and the cover glass 36 are parallel to each other and seal the light entrance 52 and the light exit 53, respectively.

First and second slide bases 24, 24' are provided on the base surface 54 of the lower base 34. Microfilm 1 is placed on the first and second slides 24 and 24'.
Elongated holes 24a, 24a' are formed along the width direction, and a pin 34a, which stands on the lower base 34, is inserted into the elongated holes 24a, 24a' so as to be movable in the horizontal direction. Therefore, the first and second slide bases 24, 24' are slidable on the base surface 54 in the width direction of the microfilm 1, that is, in the direction perpendicular to the transport direction. Note that a knob 24b is provided on the first and second slide bases 24, 24'.

[0020] The first and second slide bases 24, 24
'Above the plate-shaped first and second arms 2 having an L-shaped planar shape.
3, 23' are provided. First and second arms 23, 23
A pair of overhangs 55 protruding in the transport direction D of the microfilm 1 are provided at one end of the microfilm 1, and long holes 23a and 23a' are formed in the overhangs 55 along the transport direction D. be. A pin 56 provided on the first and second slide bases 24 and 24' is inserted into the elongated holes 23a and 23a' so as to be movable in the horizontal direction. Therefore, the first and second arms 23, 23' are connected to the first and second slide bases 24, 24'.
It is slidable along the conveyance direction D with respect to the conveyance direction D.

Further, a guide groove 57 is provided at one end of the first and second arms 23, 23' so as to be perpendicular to the conveyance direction D.

Further, a shaft 5 is provided on one side of the device main body 51.
Circular dials 31 and 32 are provided which are rotatable about 8, and pins 31a and 32a provided at eccentric positions of the dials 31 and 32 are inserted into the guide groove 57 so as to be movable in the horizontal direction.

Base members 22, 22' having an L-shaped side cross section, that is, bent toward the light entrance 52 side, are provided on the upper surfaces of the other end sides of the first and second arms 23, 23'. The members 22, 22' are fixed to the first and second arms 23, 23' by screws 58. This base member 22,
22' are provided facing each other with the light entrance 52 in between.

On the surface of the base members 22, 22',
One end side of the detection means, that is, a row of a plurality of optical fibers 29 arranged in a straight line along the conveying direction D, is fixed with adhesive. The light receiving surface 59 of the optical fiber 29 is in close contact with the inner surface of the lower glass plate 28.

Reference numeral 21 denotes a holding member for the optical fiber 29, which is made of plastic and has claw portions 21a that engage with the base member 22 at both ends. A halation prevention portion 21b is formed on the opposing surfaces of the presser members 21, and includes a plurality of wedge-shaped protrusions arranged in a row from the light inlet 52 to the light outlet 53. Further, a triangular prism-shaped indicator 21c is provided on the side surface of the holding member 21, and this indicator 21c is in contact with the lower glass plate 28. One top side of the index 21c points to the center of the optical fiber 29.

One of the optical fibers 29 described above is the A channel E, and the other is the B channel F, which is a mirror image.

On the other hand, an insertion hole 60 is formed in the mating surface of the cover 35 and the lower base 34, and the optical fiber 29 is inserted and fixed into the insertion hole 60. A photoelectric conversion element 2 such as a phototransistor is mounted on the external side of the device main body 51 via a diffusion plate 30 made of synthetic paper such as Yupo that diffuses light.
6. A printed board 27 is provided. The printed board 27 includes an amplifier circuit (not shown) and a mark discrimination circuit (not shown), and a C circuit (not shown).
It is connected to PU.

The vicinity 29 of the output end 29 a of the optical fiber 29 is held by a cylindrical holding member 25 disposed within the insertion hole 60 . A flange 25a is formed on the outer peripheral surface of the holding member 25. In addition, an elastic member 38 such as a spring or sponge is disposed inside the insertion hole 60, and presses the holding member 25 toward the photoelectric conversion element 26 side.
The output end 29a of 9 is in close contact with the diffuser plate 30.

Further, an elastic member 33 made of sponge, plate spring, etc. is disposed above the insertion hole 60, that is, on the cover 35 side, and by pressing the holding member 25 downward, the optical fiber 29 is held in the radial direction. is positioned.

[0030] The light exit port 53 has a second light-transmitting member, that is,
A cover glass 36 is provided for sealing. This cover glass 36 is adhered to the cover 35. Note that the second light-transmitting member may be made of plastic, vinyl, or the like.

Further, a pressure plate glass 39 is provided in parallel with the lower glass plate 28 at a position outside the device main body 51 and facing the light entrance 52. This pressure plate glass 39 is capable of reciprocating in the direction of arrow G by a drive means such as a solenoid (not shown), and together with the lower glass plate 28, it holds the microfilm 1 between them.

In the above configuration, the illumination light 6 of the lamp 14
1, the microfilm 1 is transported while being illuminated, and the transmitted illumination light 61 passes through the lower plate glass 28 of the light entrance 52 and is received by the optical fiber 29. This light is then irradiated onto the photoelectric conversion element 26 through the diffusion plate 30.

On the other hand, the mark 1b is detected because the illumination light 61 is blocked by the mark 1b on the microfilm 1, and the desired image frame 1a is searched for, the transport is stopped, and the microfilm 1 is placed on the pressure plate glass 39. It is held between the lower plate glass 28 and guides illumination light 61 to the screen 18 and photoreceptor 30 to project an image.

Furthermore, when the dials 31 and 32 are rotated, the first and second arms 23 and 23' are guided by the pin 56 and move on the first and second slide bases 24 and 24'.
1 and X2 directions (same as the transport direction D), and the row of optical fibers 29 can be moved in the same direction. Furthermore, when the knob 24b is operated perpendicular to the conveying direction D, the first and second slide bases 24 and 24' are guided by the pin 34a and slide on the base surface 54 in the directions of arrows Y1 and Y2, and the optical fibers 29 are aligned. can be moved perpendicular to the transport direction D.

On the other hand, since the light inlet 52 is closed by the lower glass plate 28 and the light outlet 53 is closed by the cover glass 36, dust does not enter the interior 80 of the apparatus main body 51 from the outside. Therefore, the illumination light 61 is not blocked by dust, and a stable mark detection function can be maintained. Further, since it is only necessary to clean the outer surfaces of the cover glass 36 and the lower glass plate 28, and cleaning the inside 80 is not necessary, damage to the optical fiber 29 can be prevented.

The figure shows a second embodiment. A pair of guide rails 62 are provided on the cover 35, sandwiching the light exit port 53, and a stopper 6 is provided at one end of the guide rails 62.
3 is provided. And there is an arrow H between the guide rails 62.
A second light-transmitting member 64 is inserted which can be slid in any direction. The second light-transmitting member 64 may be a glass plate or a plastic plate that does not prevent the illumination light 61 from passing through. Note that 65 is a knob provided on the second light-transmitting member 64.

In the second embodiment configured as described above, the light exit port 53 can be opened and closed by sliding the second light-transmitting member 64 in the direction of the arrow H. Further, it is more convenient if the slide of the second light-transmitting member 64 is configured to automatically open when the sensor unit 11 is set in the device and close when the sensor unit 11 is removed. This automatic opening/closing can be easily performed using a spring or the like.

[0038]

[Effects of the Invention] Since the present invention is constructed as described above, external dust does not enter into the main body of the apparatus through the light exit port. Therefore, the detection function can be stably maintained. Further, there is no need to clean the inside of the device body, and there is no damage to the detection means.

[Brief explanation of the drawing]

FIG. 1 is an enlarged side sectional view of a main part showing a first embodiment of the present invention.

FIG. 2 is a perspective view showing a schematic configuration of a microfilm reader printer to which the present invention is applied.

FIG. 3 is a plan sectional view showing the first embodiment.

FIG. 4 is an external perspective view showing a second embodiment.

FIG. 5 is a side sectional view of a conventional detection device.

[Explanation of symbols]

28 Lower plate glass (first light transmitting member) 29 Optical fiber (detection means) 36 Glass cover (second light transmitting member) 51 Device body 52 Light entrance 53 Light exit 61 Illumination light

Claims (1)

[Claims] Claim 1: An internally hollow device body is formed, the device body is provided with a light inlet and a light outlet that partition the inside and outside of the device body, and the light inlet is formed of a first light-transmitting member. In the detection device, the light exit port is closed with a second light-transmitting member. Detection device.