JPS61195073A - Picture information reader - Google Patents

Abstract

PURPOSE:To strengthen a frame intensity and to obtain the easy adjustment of precision by forming a pair of left and right sideframes and an a upper frame in one body with a single plate and providing an opening window to which an original placing transparent plate is supported and fixed on the upper frame. CONSTITUTION:On the upper part of the main body of a device 10, an original placing glass plate 12 is supported and fixed on the upper part of a frame 14 which is covered with a cover case 13. In the inside of the frame 14, a picture reading unit 18 which is installed on a carriage substrate 17 is arranged possible to move reciprocally. The frame 14 is made of the single iron plate having a thickness of 1.6mm and both left and right sideframes 51 and 51 and an upper frame 52 are formed in one body and both sideframes 51 are bent as sectionally U-shaped and a front frame 53 and a rear frame 54 are welded at the front and rear faces. In the frame 52, an opening window 55 to which the glass plate 12 is supported and fixed is formed. Thus, a rigidity for bending or twisting is increased and the frame intensity is strengthened and also the precision of assembling is heightened and less adjustment of focus etc. is required.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an image information reading device used in an image forming apparatus such as a thermal transfer color copying machine.

[Technical background of the invention and its problems]

Recently, various types of image information reading devices of this type have been developed, which have been made thinner and more compact, making them more convenient to use on a table or to carry.

However, in the conventional apparatus, as shown in FIG. 11, the frame 1 constituting the main body of the apparatus is a pair of left and right side frames made of extruded material each having a U-shaped cross section and guiding the image reading unit in the scanning direction. 2, 2 and the front and rear frames 3.4 are each formed independently and assembled into a box shape.
When supporting and fixing the document placing glass plate 5, which serves as a document placing stand, on the upper surface thereof, both ends of the document placing glass plate are fixed between the pair of left and right side frames 2.2. The flatness of the frame is greatly affected by the assembly accuracy of the frame, and for this reason, it is necessary to align each assembly component when assembling the entire device, or to adjust the focus of the optical system, etc. after assembly. The problem was that it was complicated and required time and effort.

Furthermore, conventionally, as a light source constituting an image reading unit, a light source consisting of a tube body, that is, a fluorescent lamp, has been mainly used. 6 is installed in an image reading unit or a door in the main body of the apparatus, a notch 8 is provided in the side surface of one side frame 2 of the frame 1, and the fluorescent lamp 6 is inserted through this notch 8 and the socket member 9.9 is inserted. The fluorescent lamp 6, which is held removably in the horizontal direction on the cap and is used particularly in color copying machines, is, as shown in FIG. 13, for example, in the case of A4 size longitudinal scanning type The total length t is 304■, the distance between filaments t1 is 288■, and the brightness distribution is dark at both ends and bright at the center, so the range where the brightness at the center is almost constant is defined as the effective length t0. Therefore, as shown in FIG. 12, the opening width dimension L1 in the direction orthogonal to the scanning direction of the document table formed on the upper surface of the frame 1 of the apparatus main body is equal to the effective length t0 of the fluorescent lamp 5. The width of the reading unit 70 is approximately equal to the width of the reading unit 70.

Also, the total length t of the fluorescent lamp 5 is t! Due to the same width, it is not possible to attach or remove the fluorescent lamp or image reading unit from the top side of the frame.Especially in color copying machines, the light intensity and color balance of the fluorescent lamp have a large effect on image formation.
Since fluorescent lamps have a short lifespan and need to be replaced frequently, it is necessary to make it easy to attach, remove, and replace them.

[Purpose of the invention]

The present invention was made under the above circumstances, and an object of the present invention is to provide an image information reading device that simplifies frame assembly and reduces the need for post-assembly adjustment work. It is something.

[Summary of the invention]

In order to achieve the above-mentioned object, the present invention makes an image reading unit reciprocate within a GEX type frame, and reads an original on a glass plate for placing an original supported and fixed on the upper surface of the frame. In the information reading device, the frame is integrally formed of a pair of left and right side frames and a top frame, and the top frame is provided with an open window on which the document placement glass plate is supported and fixed. It is structured as follows.

[Embodiments of the invention]

The present invention will be described below with reference to an embodiment shown in FIGS. 1 to 10.

As shown in FIGS. 1 to 3, reference numeral 10 in the drawings represents a main body of the apparatus, and an operating section 11 is provided at the front of the top surface thereof. On the upper surface of this apparatus main body 1o, a glass plate 12 for placing an original as a transparent plate constituting a document placing table is supported and fixed on the upper surface of a GEX type frame 14 covered with a cover case 13. It is supported on a pedestal 15 and can hold the original A placed on the original glass plate 12 with a document holding cover 16 that can be opened and closed.

Inside the seven frames 14, an image reading unit 18 attached to the carriage board 17 extends from the front lOh side of the apparatus main body 10 to the rear 10b side corresponding to the lower part of the document mounting glass plate 12. The image reading unit 17 is arranged to be reciprocatingly movable, and the image reading unit 17 has a pair of left and right socket members 19 .
Light source (fluorescent lamp) 2 consisting of a tube held through 19
0, a lens 21 disposed on the reflected optical path from the original A illuminated by this light source 20, and a photoelectric conversion section 22 consisting of a CCD sensor that receives the light that has passed through this lens 21 and photoelectrically converts it. be done.

In the image reading unit 18, as shown in FIG. 4, a heat-retaining heater 23 is arranged around the tube wall on the back side of the light source 20, and as shown in FIG.
For example, in the unfolded state, a heater wire (not shown) meandering in the longitudinal direction is connected to polycarbonate? 1,800 or more, which is bent into a semi-cylindrical shape by sandwiching it with heat-resistant plastic or glue such as a sheet, and excluding the range of the light source 20 with the necessary amount of light to completely illuminate at least one line of the document. The inner diameter is approximately equal to the outer diameter of the light source 20, and the tube wall of the light source 20 is elastically fitted and held in close contact with the light source 20. , light source 2
0 in the longitudinal direction is longer than the effective length t0 of the light source 20 and shorter than the distance L1 between the filaments. It is designed so that it can be maintained at a certain level. Further, at the upper end edge of the longitudinal center portion of the heat-retaining heater 23,
A cutout window 24 is cut out, and as shown in FIG.
The signal amplified by the signal amplification circuit 22 built into the conductor 2
8 to the light amount control unit 29 to automatically control the tube current of the light source 20. A slit 30 is arranged to allow only parallel lines from the light source 20 to enter, thereby increasing accuracy.

On the tube wall of the light source 20, for example, mouth-shaped and mouth-shaped positioning display parts 31.32 are printed on the outside of the effective length t0 on both ends in the longitudinal direction, and this display part 31.3
2 is used as a guide when attaching the heat-retaining heater 23 to the tube wall of the light source 20. First, position the heat-retaining heater 23 in the longitudinal direction with the vertical line of the display section 3, then display section 31.
Positioning in the circumferential direction is performed by aligning the edge of the heat-retaining heater 23 with a line connecting horizontal lines 32.

Further, the light source 2o has a pair of terminals 20m and 20 exposed at both ends bent toward the outer side, and a pair of socket members 19 fixed on the carriage board 17.
．． 19, and this socket member 19 is
As shown in FIGS. 6 and 7, there is a socket housing 33 having a U-shape in cross section, and a pair of plates/gun-shaped plates each fixed by driving a pin 34 into the inner bottom surface of the socket housing 33 and caulking the socket housing 33. A pair of electrode fixing groove parts 36.36 protrude from the lower surface of the socket housing 33 to receive the pins 34. After positioning the socket member by inserting it into the mounting hole 37. By pushing and holding both ends of the light source 200 from above, the light source 20 can be attached and detached in the vertical direction.

Furthermore, FIG. 8 shows a moving mechanism of the image reading unit 18, in which the carriage board 17 is movably installed between the guide rail 39 in the frame 14 and the guide shaft 4o. A pulley 4 has one end fixed to a timing belt 41, and drives this timing belt 41 with a stepping motor 42.
3, and the carriage board 17 is reciprocated in the scanning direction indicated by the solid arrow by the driving force of the motor 42. Further, in the figure, 44 is an inverter that supplies power to the light source 20 via a flat cable 45, which is connected to the carriage board 12. After the signal is converted into an analog signal by the converter 22, the signal is converted into a digital signal by the amplifier A/D converter 46 and sent to an external recording device. Furthermore, 4 in the figure
7 is a cooling fan, which sucks air from the drive motor 48 & C from the front side and flows it to the rear side.
In particular, the inverter 44 and the A/1) conversion section 46 are cooled.

By the way, as shown in FIG. 9, the frame 14 constituting the apparatus main body 10 is a single plate made of a 1.6-thick iron plate, and the left and right side frames 51, 51 and the top frame 52 are integrated. The front frames 53 are formed on both the front and rear surfaces by bending both side frames 51 into a cross-sectional shape.
and a rear frame 54 are welded to form an ex-type assembly, and has a structure in which an open window 55 is formed in the upper frame 52 to support and fix the document placement glass plate 12. .

Cutouts 56.56 are cut out on both the left and right side frames 5J and 51 facing in a direction perpendicular to the scanning direction of the open window 55, and as shown in FIG. 56 is approximately equal to the length t of the light source 20 of the image reading unit 18, and when the light source 20 is attached or detached, the image reading unit 18 is By moving the light source 2'0 to the notch position of the notch parts 56, 56,
can be attached and detached in the vertical direction from the upper surface side of the frame.

Note that the present invention is not limited to the above-mentioned embodiments, and it goes without saying that various modifications can be made without departing from the gist of the present invention.

〔Effect of the invention〕

As described above, according to the present invention, the left and right side frames and the top frame of the frame in which the image reading unit is movably disposed are integrally formed of a single plate, and the seven frames on both sides have a U-shaped cross section. Since it has a structure in which it is bent, it has high bending and torsional rigidity, and the frame strength can be increased.In addition, the flatness of the support part of the glass plate for placing the original can be easily achieved, which makes assembly easy. In addition, it has excellent effects such as less adjustment of focus etc. after assembly.

[Brief explanation of the drawing]

FIG. 1 is an external perspective view showing an embodiment of an image information reading device according to the present invention, FIG. 2 is a schematic sectional view showing the internal structure in a direction perpendicular to the scanning direction, and FIG. 3 is an internal view in the scanning direction. A schematic cross-sectional view showing the structure, Fig. 4 is a schematic enlarged view of the main parts of the image reading unit, Fig. 5 is an exploded view showing how the heat-retaining heater is attached to the light source, and Fig. 6 is an exploded view showing how the heat-retaining heater is attached to the light source. - Figure 7 is an exploded view showing the mounting state of the socket part, Figure 8 is a schematic explanatory diagram showing the moving mechanism of the image reading unit, Figure 9 is a schematic diagram of the frame. 10 is a schematic plan view of the frame, and FIG. 11 is a schematic perspective view showing the conventional frame structure.
2 is a schematic sectional view showing the arrangement of a conventional image reading unit in a frame, and FIG. 13 is an explanatory diagram of a light source. 10... Apparatus main body, 12... Glass plate for document placement,
14...Frame, 18...Image m capture unit, 5
1...Side frame, 52...Top frame, 5
5...Open window, 56...Notch, A...Manuscript. Applicant's Representative Patent Attorney Takehiko Suzue Figure 4 Figure 5 Figure 6 Figure 10 Figure 11

Claims (4)

[Claims] (1) In an image information reading device in which an image reading unit scans within a box-shaped frame and reads an original on a transparent plate for placing an original supported and fixed on the upper surface of the frame, the frame has a pair of left and right sides. An image information reading device characterized in that a side frame and an upper frame are integrally formed from a single plate, and the upper frame is provided with an open window in which the transparent plate for placing a document is supported and fixed. (2) The image information reading device according to claim 1, wherein the side frame is bent to have a U-shaped cross section. (3) A notch is provided in both the left and right side frames of the open window formed in the top frame that face each other in a direction perpendicular to the scanning direction of the image reading unit, and the light source can be attached and removed at the cutout position of the notch. An image information reading device according to claim 1, characterized in that: (4) The image information reading device according to claim 1 or 3, wherein the width of the open window in the direction perpendicular to the scanning direction is shorter than the length of the light source.