JPH09321942A - Light source lamp cooling structure for original reader - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a cooling structure of a light source lamp with a simple configuration in which the light source lamp is effectively cooled in the original reader in which an original read means, a reflection original lighting light source lamp and a transmission original lighting light source lamp lighted alternatively, the light emitted from the light source lamp is emitted to the original and the reflected light or the transmitted light is detected from the original so as to read the original image. SOLUTION: Light source lamps 46, 47 for lighting a reflected original and a light source lamp 48 for lighting a transmission original are arranged in one lamp box 12, optical fiber bundles 6-8 are interposed between each of the light source lamps 46-48 and respective emission position of the original and an intake 12b for a cooling wind from a cooling fan 55 is provided to one end of the lamp box 12 and a hot air exhaust duct 56 is connected to the other end of the lamp box 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light source lamp cooling structure in an original reading device used for making a plate from a printed original.

[0002]

2. Description of the Related Art For example, in the case of making a plate from a printing original and printing the original, an original called a scanner is used to convert the original image into an electric signal and read it and perform various signal processing to obtain a desired image before making the original. Reader is in use.

Some small document reading devices move the light source or the reading head with respect to a fixed document, but when the document is large, the document table on which the document is set is moved to perform sub-scanning. It is known to do so.

Specifically, a document is set on a document table which can be moved in the horizontal direction, and the document table is moved in the horizontal direction to enter the reading section. Illumination light for reflected originals or illumination light for transmitted originals is applied in a line at a right angle, and the reflected or transmitted light is imaged on a line sensor via a lens system, and the line sensor is scanned in sequence to form an image. Along with reading the signal, the entire original is read by sub-scanning by moving the original table.

[0005]

By the way, in this type of document reading apparatus, a reflection illumination system for obtaining reflected document illumination light and a transmission illumination system for obtaining transmitted document illumination light are required. However, in the reflected illumination system and the transmitted illumination system,
Since the irradiation position on the original is different, the light source lamp for illuminating the reflective original and the light source lamp for illuminating the transparent original are conventionally arranged at different portions.

However, since a halogen lamp that is generally used as a light source lamp generates a large amount of heat, it is necessary to cool it with a fan. Conventionally, the reflection illumination system and the transmissive illumination system each have a fan. Since the system duct is provided, there is a problem that the cooling system of the light source lamp becomes complicated.

In view of the above-mentioned circumstances, the present invention is provided with a document reading means, and a light source lamp for illuminating a reflected document and a light source lamp for illuminating a transmissive document which are selectively turned on, and the light source lamp emits light to the document. In a document reading apparatus configured to read a document image by irradiating light and detecting reflected light or transmitted light from the document, the light source lamp can be effectively cooled with a simple configuration. An object is to provide a light source lamp cooling structure.

[0008]

A light source lamp cooling structure of a document reading apparatus according to the present invention has a light source lamp for illuminating a reflected document and a light source lamp for illuminating a transmissive document arranged in one lamp box. An optical fiber bundle is provided between each light source lamp and the irradiation position of each light source lamp on the original, and an inlet for cooling air from a cooling fan is provided at one end of the lamp box and hot air is provided at the other end of the lamp box. It is characterized in that the exhaust duct is connected.

In this case, two light source lamps for reflecting originals and one light source lamp for transmitting originals are vertically arranged in the lamp box, and a cooling air inlet is provided at the lower end of the lamp box. It is preferable to connect a hot air exhaust duct to the upper end of the lamp box.

[0010]

According to the present invention, a light source lamp for illuminating a reflective original and a light source lamp for illuminating a transparent original are arranged in one lamp box, and each light source lamp is located between the illuminating position for each original. In addition to interposing an optical fiber bundle in the lamp box, a cooling air inlet from a cooling fan is provided at one end of the lamp box, and a hot air exhaust duct is connected to the other end of the lamp box. All the light source lamps can be effectively cooled, and a high degree of freedom regarding the layout of the lamp box in this document reader is obtained.

Further, when two reflection original illumination light source lamps are provided and two systems of reflection illumination system are provided, the original surface can be illuminated from two directions, so that the original surface is shaded. There is no fear.

Particularly, when the light source lamps are vertically arranged in the lamp box, a cooling air inlet is provided at the lower end of the lamp box, and a hot air exhaust duct is connected to the upper end of the lamp box, the light source lamp is cooled. The efficiency can be improved.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a front view in which a part of a document reading apparatus having a light source lamp cooling structure according to the present invention is omitted, and FIG. 2 is a right side view of the same.

The document reading device 1 includes a document setting portion 2 in which a main body frame 4 constituting the framework of the device is formed low.
And a reading unit 3 formed higher than the above, and the document setting unit 2 has a document table 5 for detachably holding the document, and the document table 5 is slidably provided in the reading unit 3. Has been. Further, the reading unit 3 vertically moves the reflection original document illumination optical fiber bundles 6 and 7 and the transmission original document illumination optical fiber bundle 8 which illuminate the original document linearly in a direction substantially perpendicular to the moving direction of the document table 5. A camera 9 having a lens system 15 and a line sensor 16 above which the original document moves, a rotary drum type filter 10 arranged in front of the camera 9, and a mirror section 11 are provided below The lamp box 12 and the board box 13 are arranged.

On the other hand, the original table 5 has a movable base 23 slidably supported by two guide bars 21 and 22.
An original receiving member 24 made of a transparent material, which is swingably mounted on the movable base 23 and on which an original is placed, and an original which is openably and closably attached to the movable base 23 and is pressed against the original receiving member 24. Close Original cover 2 made of transparent material
5. This document holding cover 25
As shown in FIG. 2, the damper arm 26 is biased in the opening direction.

The movable board 23 is supported by the above-mentioned guide bars 21 and 22 extending from the document setting section 2 to the reading section 3 on the main body frame 4, and is movable, as shown in FIG. Similarly, the ball screw 27 extending from the document setting unit 2 to the reading unit 3 is screwed and linked, and the driving motor 28 rotationally drives the ball screw 27 to control the movement at a constant speed. The drive motor 28 is installed in the reading unit 3 and is linked to the end of the ball screw 27.

Although not shown, an opening / closing cover is installed on the upper surface of the document setting section 2, and the upper side is closed when the document table 5 is moved. In addition, the original pressing cover 2
Although the closed state of 5 is locked by the lock mechanism, this lock release mechanism is arranged on the main body frame 4 side, and the document holding lid 25 can be opened and closed only when the document table 5 is stopped at a predetermined position. It is possible.

On the other hand, in the reading section 3, a pair of optical fiber bundles 6 and 7 for reflecting originals is installed above the original table 5 that has moved as described above, and one optical fiber for transmitting originals is provided below. A bundle 8 is installed to illuminate the originals linearly. Each of the optical fiber bundles 6 to 8 is composed of a large number of optical fibers, the illumination end of which is linearly arranged in a line, and the other end of which is bundled into a cylindrical shape, and a lamp box 12 arranged below the reading unit 3. The three light source lamps (halogen lamps 46 to 48) are installed to face each other. Further, in front of the linear illumination end, the light flux is adjusted through the cylindrical rod-shaped lenses 31 to 33 and is irradiated onto the document. As will be described later, three light source lamps are collectively arranged in the lamp box 12, and the inside of the lamp box 12 is cooled by a cooling fan.

First optical fiber bundle 6 for illuminating reflected originals
Are inclined so that the illumination end thereof illuminates the surface of the document from the front at an angle of 45 ° in the traveling direction of the document. The second reflected original illuminating optical fiber bundle 7 has its illuminating end installed horizontally from the front with respect to the original traveling direction, and a reflecting mirror 34 inclined obliquely downwardly provided in the facing portion with respect to the original traveling direction. It is arranged so as to illuminate the surface of the original from a diagonally 45 ° rear side.

The optical fiber bundle 8 for illuminating a transmissive original has its illuminating end installed horizontally from the front with respect to the traveling direction of the original, and a reflecting mirror 35 inclined obliquely upward is provided at the facing portion and provided from the bottom to the top. Illuminate the original through illumination.

A mirror portion 11 is provided above the illumination position of the original document by the optical fiber bundles 6 to 8 for original document illumination.
The mirror portion 11 is installed at the upper end corner of the main body frame 4 of the reading portion 3, and the reflecting surface of the mirror portion 11 reflects the light from below in a direction substantially parallel to the document traveling direction, but is incident. The light is not reflected in the direction perpendicular to the light, but the optical axis after the reflection is set to be inclined slightly downward with respect to the horizontal direction (the moving direction of the document).

In the optical path reflected by the mirror section 11,
Rotating drum filter 10, lens system 1 for camera 9
5, the line sensor 16 is installed in this order, these are fixed to the mounting frame 37, and this mounting frame 37 is fixed to the main body frame 4 in an inclined manner. The mounting position of the camera 9 is adjustable.

In the camera 9, the lens system 15 is provided on the lens barrel, the optical path is divided at the focal position thereof via the half prism 39, and the line sensors 16 are alternately installed at the respective focal points so that signals on a straight line are continuous. It is configured to be obtained by. Main scanning for sequentially reading the signals of the respective sensors in the line sensor 16 is performed by a control board (not shown), and the control board is the board housing section 4 at the back of the camera.
0, an adjustment space for absorbing variations in the focal length of the lens system 15 is provided between the camera 9 and the substrate housing portion 40, and the camera 9 is moved and adjusted in the optical axis direction.

In the rotary drum type filter 10, both side rotary plates of the cylindrical drum are pivotally supported by a shaft 10a, and a plurality of (for example, 6) filters 41 are arranged at equal intervals in the cylindrical portion. Filter 4 stopped in front of the lens
The optical filter is provided so that the optical axis passes through the filter gap on the cylindrical surface on the opposite side to 1, and the desired filter 41 can be used by controlling the rotational position thereof.

Next, FIG. 3 is a front view showing the configuration of the lamp box 12 and the light source lamp cooling system, FIG. 4 is a left side view of the same, and FIG. 5 is a plan view of the same. 3 to 5 are partially cut away, and the route of the air for cooling the light source lamp is indicated by the symbol A.

As is apparent from FIG. 3, three halogen lamps 46 to 48 are vertically arranged in the lamp box 12 which is formed in the shape of a slender quadrangular prism which stands upright in the vertical direction. The halogen lamp 48 is a light source lamp for illuminating a transparent original, and the remaining two halogen lamps 46 and 47 are light source lamps for illuminating a reflective original. The light source lamp for illuminating the transparent original and the light source lamp for illuminating the reflective original are selectively turned on according to the type of the original to be read.

Halogen lamp 46 of lamp box 12
Each of the halogen lamps 4 is provided on the side wall 12a which faces the lamps 48 to 48.
Three circular holes (not shown) are formed at positions corresponding to 6 to 48, and cylindrical mounting members 51 to 5 for supporting the cylindrically bundled ends of the optical fiber bundles 6 to 8, respectively.
Since 3 is fixed to the outer wall surface of the side wall 12a coaxially with each circular hole, the light emitted from each halogen lamp 46 to 48 irradiates the above-mentioned three originals through the optical fiber bundles 6 to 8, respectively. It is configured to be guided to a position.

A cooling air inlet 12b is provided in the lower part of the lamp box 12, and a hot air exhaust port 12c is provided in the upper part of the lamp box 12, so that the lamp box 12 itself serves as a duct for the cooling air. Is forming. The cooling air inlet 12b is connected to the air outlet 55a of the sirocco fan 55 via a short intermediate duct 54, and the hot air outlet 12c is connected to an exhaust duct 56.

An air intake port 55b provided on the lower surface of the sirocco fan 55 is connected to an air intake duct 58 having an air filter 57 on its upper part. A rectifying plate 59 is provided at the bottom of the lamp box 12 to effectively flow the cooling air upward. Further, temperature sensors 61 and 62 for detecting an overheated state are attached to the side wall 12d of the lamp box 12 as shown in FIG.

With such a configuration, the air filter 57
The air sucked into the sirocco fan 55 through the air intake port 55b passes through the air outlet port 55 of the sirocco fan 55.
Halogen which is blown out from a as cooling air, passes through the intermediate duct 54, enters the lamp box 12 through the cooling air inlet 12b at the lower part of the lamp box 12, is directed upward by the straightening plate 59, and is turned on. Lamp 4
After cooling 6, 47 or 48, hot air is discharged to the outside from the hot air exhaust port 12c in the upper part of the lamp box 12 through the exhaust duct.

According to the present embodiment, the halogen lamps 46 and 47 for illuminating the reflected original and the halogen lamp 48 for illuminating the transparent original are arranged in one lamp box 12.
Further, since the optical fiber bundles 6 to 8 are provided between the halogen lamps 46 to 48 and the irradiation positions on the respective originals, all the halogen lamps 46 to 48 are effectively cooled by the single cooling system. In addition to the above, the lamp box 12 in the document reading apparatus 1 can be used.
A high degree of freedom can be obtained for the layout.

Further, a halogen lamp 4 for illuminating the reflected original document
6, 47 and a halogen lamp 48 for illuminating a transparent original are vertically arranged in the lamp box 12, and an inlet 12b for the cooling air from the sirocco fan 55 is provided in the lower part of the lamp box 12 and By connecting the hot air exhaust duct 56 to the upper portion, the halogen lamps 46 to 48 can be efficiently cooled.

Furthermore, by providing two reflection illumination systems, the original surface can be illuminated from two directions.
There is no risk of shadows on the document surface.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a document reading apparatus having a light source lamp cooling structure according to the present invention with a cover and the like omitted.

[Figure 2] Same right side view

FIG. 3 is a front view showing a configuration of a lamp box and a light source lamp cooling system.

FIG. 4 is a left side view of the same.

[FIG. 5] The same plan view

[Explanation of symbols]

1 Original Reading Device 2 Original Setting Section 3 Reading Section 4 Body Frame 5 Original Plate 6,7 Optical Fiber Bundle for Reflecting Original Illumination 8 Optical Fiber Bundle for Transmissive Original Illumination 9 Camera 10 Rotating Drum Type Filter 11 Mirror 12 Lamp Box 15 Lens System 16 Line sensor 23 Moving base 24 Original receiving member 25 Original pressing cover 27 Ball screw 34 Reflecting mirror 37 Mounting frame 39 Half prism 46,47 Reflective original illumination halogen lamp (light source lamp) 48 Transparent original illumination halogen lamp (light source lamp) 55 Sirocco fan (cooling fan) 56 Exhaust duct

Claims (2)

[Claims] 1. An original reading means, a light source lamp for reflecting an original light and a light source lamp for illuminating a transparent original, which are selectively turned on, are provided, and the original is irradiated with light emitted from the light source lamp, In a document reading apparatus configured to read a document image by detecting reflected light or transmitted light from a document, the light source lamp for reflecting the document and the light source lamp for illuminating the transparent document are arranged in one lamp box. And an optical fiber bundle is provided between each light source lamp and the irradiation position of each light source lamp with respect to the document, and an inlet for cooling air from a cooling fan is provided at one end of the lamp box, and A light source lamp cooling structure for a document reader, comprising a hot air exhaust duct connected to the other end of the lamp box. 2. The lamp box includes two light source lamps for illuminating a reflective original and one light source lamp for illuminating a transparent original arranged vertically in the lamp box, and the cooling air inlet is provided at a lower end of the lamp box. 2. A light source lamp cooling structure for a document reading apparatus according to claim 1, wherein a hot air exhaust duct is connected to an upper end of said lamp box.