JPH01151360A - Original lighting system - Google Patents

Abstract

PURPOSE:To unify the right and the left light quantities of an original face illuminated by an illumination light source by providing holders for both the ends of the illumination light source and providing a positioning part to engage with the holders and position and hold the illumination light source in parallel with an original lighting part for the each holder. CONSTITUTION:Holders 4f and 4f made of resin are provided for both the ends of a lamp tube 4e as the illumination light source extented in a device width direction in parallel with an original base panel 4d and a back reflecting plate 4g to whose both ends the holders 4f and 4f are fitted is provided. Positioning pins 4o and 4p as positioning parts to hold the lamp tube 4e in parallel with the original vase panel 4d are projectionally provided for the upper and the lower faces of the holders 4f and 4f in contact with a back reflecting plate 4g and fitting piece parts 24c and lock into pin holes 4g' and 24d provided for the back reflecting plate 4g and the fitting piece parts 24c. Thus, the illuminance of the original face can be kept constant without nonuniformity, the illuminance can be made uniform even when a lamp of a thin diameter is used as the light source and the device can be also miniaturized.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a document illumination device applied to, for example, a facsimile machine, and more particularly to a mounting structure for an illumination light source.

(Prior Art) Conventionally, in document reading devices such as facsimiles, the surface of the document is illuminated by an illumination device at a reading position midway through the document conveyance path, and the illuminated image light is sent to a reading device such as a COD via an optical system. Image information is read by exposing the image. Tubular fluorescent lamps have generally been used as light sources for illumination devices. Terminal pins as electrodes protrude from both ends of this fluorescent lamp, and a socket for connecting the terminal pins is provided on the main body of the device.After assembling the main body of the device, the fluorescent lamp can be inserted and fixed to the socket. It was common to install The sockets are usually fixed to the left and right side plates that are perpendicular to the document conveyance guide, and are fixed to the main body of the apparatus as a separate member from the document conveyance guide.

(Problem to be solved by the invention) However, in the conventional example described above, the tube diameter of the fluorescent lamp is large (generally small 16 m + s, very rarely φ10 mm).
degree), which was an obstacle to device miniaturization.

Therefore, we decided to replace fluorescent lamps as illumination light sources with small diameter tubes (
Xe tubes have begun to be used as cold cathode tubes to save space.

However, this Xe tube has a light intensity of 1710% compared to a fluorescent lamp.
Because of the low light intensity and darkness, they had to be placed closer to the document surface than fluorescent lights, and reflective members were also required to increase the amount of light. As a result, unless the parallelism of the illuminating reading line is made stricter than that of fluorescent lamps, the light intensity differs greatly between the left and right sides of the reading area. Also, Xe
Because the diameter of the tube is small, it is difficult to connect it to a fluorescent lamp type socket that has pins at both ends.Normally, the tube has a lead wire soldered to it, molded with resin, and holders are installed at both ends. Because of the structure in which the lead wires are pulled out, there was a problem in that it was difficult to accurately attach the Xe tube.

The present invention has been made in order to solve the above-mentioned problems of the prior art, and its object is to provide an original illumination device that can easily set the parallelism of a linear illumination light source to the original surface. Our goal is to provide the following.

(Means for Solving the Problems) In order to achieve the above object, in the present invention, a linear illumination light source for illuminating the original is provided below the original illumination provided in the conveyance unit that guides the conveyance of the original. In the document illuminating device, a holder is provided at both ends of the illumination light source, and the holder is provided with a positioning portion that engages with the conveyance portion to position and hold the illumination light source parallel to the document illumination portion. It is characterized by becoming.

(Function) The illumination light source is positioned parallel to the original illumination section by the positioning sections provided on the holders at both ends of the illumination light source.
The amount of light illuminated by the illumination light source on the left and right sides of the document surface is made uniform.

(Example) The present invention will be explained below based on the illustrated example. 1st
6 to 6 show a document reading device to which a document illuminating device according to an embodiment of the present invention is applied. In the figure,
Reference numeral 20 designates the entire device, which generally includes a document transport section 21 provided on the top surface of the device, an illumination device 40 for illuminating the document 1, and a light receiving device serving as a reading means disposed inside the device to capture an image of the illuminated document 1. and an optical system 5 for performing imaging exposure on the element 5e.

The recording unit 22 is arranged at the front of the apparatus, and each part is assembled on the apparatus frame 8, which also serves as a bottom cover.

The document transport section 21 is assembled to a transport frame 24 provided on the apparatus frame 8.

The transport frame 24 is composed of side plates 24b, 24b, and a horizontal document guide 4 connected between the side plates 24b, 24b.

The document guide 4 is provided with a transparent document table panel 4d as a document illumination unit that illuminates the document 1, and the document conveyed onto the document table panel 4d is illuminated by an illumination device 40 disposed below the document table panel 4d. Then, the image light is image-formed and exposed to the light receiving element 5e via the optical system 5, and converted into an electric signal to read the original image.

Above the document guide 4, a guide plate 3 is disposed to face each other, and on the upstream and downstream sides of the document platen panel 4d, there are a pair of upper and lower paper feed rollers for feeding the document 1 onto the document table panel 4d. 3d.

On the downstream side of 4C, a pair of upper and lower paper ejection rollers 3e and 4d for ejecting the document l is arranged. On the other hand, paper feed roller 3d
, 4c, a separation roller 4b for separating the stacked documents 1 one by one is arranged on the upstream side of the document 1, and the separation roller 4b
A separation friction piece 3b is pressed onto the outer peripheral surface via a pressure spring 3C.

Furthermore, a deformation roller 4a having a non-circular cross section is arranged upstream of the separation roller 4b, and a pre-conveying tongue 3a is in contact with the outer periphery of the deformation roller 4a.

The illumination device 40 is, for example, a Xe tube or the like, and is disposed below the document table panel 4d, offset toward the downstream side in the transport direction with respect to the center line of the panel 4d. The illumination device 40 includes a lamp tube 4e as an illumination light source extending in the width direction of the device parallel to the document table panel 4d;
e Resin holders 4f, 4f provided at both ends, and a back elbow plate 4 to which the holders 4f, 4f are attached to both ends.
It consists of 4g blue reflector plate and screws 4n on both ends.
, 4n, both side plates 24b of the transport frame 24,
It is collinear with the mounting piece 24C124c formed on 24b. On the other hand, holder 4f.

Positioning bins 4o, 4 are provided on the upper and lower surfaces of the back plate 4f that come into contact with the back elbow plate 4g and the mounting piece 24c as positioning portions that hold the lamp tube 4e parallel to the document table panel 4d.
p is provided protrudingly, and the back elbow plate 4g and the mounting piece part 24
It is locked in pin holes 4g' and 24d provided in c.

The reflective surface 4Q of the back elbow plate 4g is located on the downstream side of the lamp tube 4e in the document conveyance direction, and reflects light directed toward the back side from the lamp tube 4e toward the document surface side. On the other hand, a light shielding sheet 4h such as a black polyester sheet is provided at the lower part of the back elbow plate 4g to shield light from leaking downward from the lamp tube 4e. In addition, the 4th sentence is the lamp tube 4e.
The lead wire, 4 m long, is a lead wire holder spot welded to the transport frame 24.

On the other hand, reference numeral 41 denotes a sub-reflection plate as a reflection member separate from the above-mentioned dorsal elbow plate 4g, and is arranged below the document guide 4 on the upstream side with respect to the slit 25. This sub-reflector plate 41 is provided parallel to the lamp tube 4e at a predetermined interval in the transport direction.

The sub-reflection plate 41 has a Z-shaped cross section, and the reflection surface 4r facing the lamp tube 4e is slightly inclined upward, so that the light from the lamp tube 4e is reflected toward the document surface side. .

The upper edge of the sub-reflector 41 is bent toward the downstream side in the conveyance direction of the document 1, and the lower surface of the upstream end 4dQ of the document table panel 4d is placed on the upper surface of this bent portion 4i1. Bending part 4i
0 has a partially cut and raised portion 4i1. 4i1 is provided in a protruding manner so as to come into contact with the panel end of the document table panel 4d. - side, the downstream end 4dl of the document table panel 4d is
It is supported on a stepped portion 27a formed at the edge of the document guide 4 described above, and this stepped portion 27a.

Cut-and-raised portion 4i provided at the bent portion 4i0 of the upper edge of the sub-reflector 41
1. '4i1 to position the document table panel 4d in the conveyance direction.

Further, the above-mentioned optical system 5 includes the first. Second. 3rd mirror 5
It is composed of mirror groups a, 5b, and 5c and a lens 5d, and the first mirror 5a is composed of a lamp tube 4e and a sub-reflection plate 41.
It is arranged so as to face the original l on the original platen panel 4d through the gap between the original document plate 4d and the original document l on the original platen panel 4d. The image light reflected by this first mirror 5a is transmitted to a second mirror 5b and a third mirror 5C.
The light is image-formed and exposed to the light receiving element 5e through the imaging lens 5d.

An operation panel 2 is disposed on the document transport section 21 so as to cover the transport section 21 . A printed circuit board 2a is provided on the back side of the operation panel 2, and this printed circuit board 2a
Various switches such as operation switches, a liquid crystal display panel 2d, etc. are incorporated in the . The switch consists of a key top 2C projecting onto the operation panel 2 and a tact switch 2b on a board 2a.

On the other hand, the recording section 22 includes a recording paper 18 wound into a roll, a printing section 22a for printing on the recording paper 18, and a recording paper cover 9 for covering the recording paper 18 and the printing section 22a in an openable and closable manner. It is equipped with The printing unit 22a includes a platen roller 11 placed in front of the recording paper 18, a thermal head 10 that comes into contact with the platen roller 11, and a presser spring 1 for pressing the thermal head 10 against the platen roller 11.
It consists of 0c. Further, a recording paper guide tab is provided between the platen roller 11 and the recording paper 18.

Further, in front of the printing section 22a, there is a recording paper 18 on which printing is performed.
Fixed blade 12b and movable blade 1 for cutting into a predetermined length
A cutter part 12 is provided consisting of a cutter part 2a. A fixed blade guide 12c is provided on the fixed blade 12b, and a guide plate 11a is provided at a position facing the fixed blade guide 12c, so that the paper is ejected from the paper ejection port. A tray 13 is provided at the lower edge of this paper discharge port.

Further, the top surface of the recording paper cover 9 is arranged so as to be substantially concave with the transport surface of the document transport section 21 described above, so that the document 1 is fed from the top surface of the recording paper cover 9.

A positioning slider 9a is provided on the upper surface of the cover 9 to determine the transport position of the original 1, and guides the transport direction of the original 1 sent to the transport section 21.

The platen roller 11 of the printing section 22a described above is driven and controlled via a recording drive motor 50 as shown in FIG. This recording drive unit 50 has fixed parts 17g and 17h.
A recording drive motor 17a, a pinion 17b, and a gear 17c are assembled to a substrate 17 fixed to the apparatus frame 8 by.

17d, 17e, 17f and a drive transmission mechanism including a platen gear 11b.

On the other hand, the cutter section 12 is driven and controlled by a cutter drive unit 51 disposed on the opposite side of the recording drive unit 50. The cutter drive unit) 51 has fixed parts 16g, 1
A crank lever 16e is assembled to a base plate 16 fixed to the frame 8 by a screw 6h, and is connected to a cutter drive motor 16a, a binion 16b, a gear 16c, a crank gear 16d, and a moving blade operating lever 12f.
It is composed of. Here, 12d is the movable blade 1
2a is the rotation center axis, and 12e is the moving axis of the movable blade.

Further, a power source 7 is arranged at the rear end of the device frame 8. The left side of the power source 7 is an input side, to which a power input cord 7b is connected, and a power switch 7a is provided.

On the other hand, on the right side of the power source 7, a lighting ballast 14 and a speaker 15 are arranged. Further, on the lower surface side of the device frame 8, the space below the optical system 5, recording paper 18, platen roller 11, etc. is used to accommodate printed circuit boards for electrical circuits.
19 is stored and protected by a bottom cover 19a. In FIG. 6, 8a and 8b are positioning bosses of the optical system 5, and 5f is a fixing part of the optical system.

Next, the operation of the document illuminating device applied to the document reading device will be explained.

First, the originals 1 are stacked and set on the recording paper cover 9, and the originals 1 are inserted into the conveying section 21 (in the direction A in FIG. 2), and the leading edge of the originals 1 is brought into contact with the separation roller 4b. Separation roller 4b
When it rotates, the stacked originals 1 are separated by the frictional force with the separation friction piece 3b, and are conveyed onto the original platen panel 4d as an illumination section by paper feed rollers 3d and 4c'.

The document 1 conveyed onto the document table panel 4d is illuminated by the illumination device 40 located below. Here, the lamp tube 4e of the lighting device 40 is connected to the side plate 2b of the transport frame 2 via holders 4f provided at both ends thereof.

2b, and is positioned parallel to the document table panel 4d by positioning pins 4o, 4°. As a result, the distance between the lamp tube 4e and the reading line on the document table panel 4d becomes uniform over the entire length of the lamp tube 4e, and the illuminance on the document surface becomes uniform on the left and right sides, allowing the light-receiving element 5e to accurately read the image. can.

Furthermore, in this embodiment, the above-mentioned positioning bin 4p,
Holes 4g' and 4g' are provided to engage with the lamp tube 4e.
Since it is attached to the transport frame 2 integrally with the
Not only can the parallelism between the blue reflector 4g and the lamp tube 4e be accurately set, but also the parallelism between the blue reflector 4g and the document table panel 4d can be accurately set, and unevenness in light amount due to incorrect installation accuracy of the blue reflector 4g can be prevented. can also be prevented.

The original image on the original platen panel 4d illuminated by the original illuminating device 40 in this manner is the first image on the original platen panel 4d. Second. Third mirror 5a, 5
b, 5c, and is imaged and exposed onto the light receiving element 5e via the lens 5d, where it is converted into an electrical signal. The image information converted into an electrical signal is stored in a storage element, printed out on recording paper 18 of the recording section 22, or transmitted as a facsimile.

In addition, in the case of a Xe tube, since a high voltage is applied to the auxiliary voltage of the lamp tube 4e, the surrounding metal should be at least 2m away from the tube wall.
If the distance is not more than m, the positive column 4t that appears inside the lamp tube 4e will be attracted by the influence of the electric field, and the positive column 4t (which emits light near the discharge column of discharge and looks like a bundle of light)
may become twisted, resulting in uneven illuminance on the document surface. In this regard, in the present invention, the blue reflector plate 4g
are integrally assembled so as to be parallel to the lamp tube 4e by means of the positioning pin 4p, so that it is possible to prevent the occurrence of twisting of the positive column 4t due to deviation in parallelism.
It is also possible to prevent uneven illuminance due to twisting of the sunlight column 4t.

In this embodiment, a cold cathode tube such as a Xe tube is used as the illumination light source, but the present invention can be similarly applied to an anode cathode tube of a fluorescent lamp tube and other linear illumination light sources.

Furthermore, in this embodiment, a case has been described in which the document illumination device is applied to a document reading device, but the present invention is not limited to this, and it goes without saying that the document illumination device can also be applied to a copying machine or the like.

(Effects of the Invention) The present invention has the above-described configuration and operation, and since the illumination light source is positioned parallel to the document illumination section by the positioning sections provided in the holders at both ends of the illumination light source, the illuminance on the document surface can be reduced. It can be kept constant without any unevenness. Therefore, even if a small diameter lamp is used as a light source, the illuminance can be made uniform.
It is also possible to downsize the device.

[Brief explanation of the drawing]

1 is a schematic exploded perspective view of a document illuminating device according to an embodiment of the present invention, FIG. 2 is a longitudinal cross-sectional view of a document reading device to which the illuminating device of FIG. 1 is applied, and FIG. FIG. 4 is a side view of the conveyance section of the device in FIG. 2, FIG. 5 is an external perspective view of the device in FIG. 2, and FIG. FIG. 2 is a cross-sectional view of the device. Description of symbols 1...Original 4d...Original table panel (original illumination section) 21...Transportation section 24...Transportation frame 40...Original illumination device 4e...Lamp tube (illumination light source) 4f ... Holder 4g ... Back elbow board 4o
, 4p...Positioning pin (positioning part) Fig. 3 Fig. 4

Claims (1)

[Claims] Below the document illumination provided in the conveyance section that guides the conveyance of the document,
In a document illumination device in which a linear illumination light source for illuminating a document is arranged, a holder is provided at both ends of the illumination light source, and the holder is engaged with the conveyance section to align the illumination light source parallel to the document illumination section. A document illuminating device comprising a positioning section for positioning and holding the document.