JPH03283969A - Original read unit - Google Patents

Abstract

PURPOSE:To allow assembling and adjustment to be implemented independently of an equipment case and to save man-hour of the assembly and adjustment by integrating a light source, a reflecting mirror, a lens and a photoelectric conversion element or the like into a chassis as a unit and arranging the unit chassis into the equipment case. CONSTITUTION:A read glass 11, a light source 12, reflecting mirrors 13A, 13B, 13C and a shade plate 22 are mounted to a chassis 20 in an original read unit 8, a lens 14 and a photoelectric conversion element 15 are placed in the lens holder 28 and the lens holder 28 is positioned to a prescribed position to assemble the original read unit 8 and the chassis 20 is fixed into the equipment case with a fastening screw to make the assembling of the original read unit 8 into the equipment case complete.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a document reading unit suitable for use in a facsimile machine.

[Prior Art] In a facsimile machine for general office use that uses a telephone network to send and receive documents, image information, etc., when multiple documents to be sent are placed one on top of the other, automatic paper feeding I! The device is configured to send originals to be transmitted one by one in sequence, and image information is read by a document reading unit, converted into an electrical signal, and transmitted to a partner device. FIG. 3 is a schematic configuration diagram showing a conventional example of such a document reading unit, in which 1 is a housing of a facsimile machine, 2 is an automatic paper feed roller, 3 is a pad for preventing double-sheet feeding, 4 is a document to be sent, 5 is a spring that presses the pad 3 against the automatic paper feed roller 2; 6 is a document conveying path; 7 is a transmission roller disposed at a document reading position; and 8 is a document reading unit.

The automatic paper feed roller 2 is rotationally driven in the document conveyance direction (arrow direction) by a stepping motor (not shown), and the rotation of the roller 2 is transmitted to the transmission roller 7 via an intermediate gear train (not shown). It is configured as follows. The transmission roller 7 includes a transmission section cover 10 that can be opened and closed and covers the transmission section 9.
It is disposed on the back side of the sheet together with the pad 3 and spring 5, and is rotated in the same direction and at the same circumferential speed as the automatic paper feed roller 2. Frictional force M between automatic paper feed roller 2 and transmission document 4
l, the frictional force M2 between the transmitted original 4 and the frictional force M between the transmitted original 4 and the pad 3 are different, and M t > M
3>M2, so that the documents to be sent are sent out one by one starting from the document 4 at the bottom.

The document reading unit 8 includes a reading glass 11, a light source 12,
It is equipped with a reflecting mirror 13, a condensing lens 14, a photoelectric conversion element 15 such as a CCD, etc., and when the transmission original 4 is irradiated by the light source 12 and an image is scanned by feeding the transmission original 4, the reflected light that hits the transmission original 4 is reflected. An image is formed on a photoelectric conversion element 15 via a reflecting mirror 13 and a condensing lens 14, and the image is converted into an electrical signal.

[Problems to be Solved by the Invention] However, in such a conventional document reading unit, the light source 12, the reflecting mirror 13, the lens 14, the photoelectric conversion element 15, etc. are individually separated, and a case for storing them is required. 16 was integrated with the housing 1, the optical system had to be adjusted together with the housing 1, which imposed restrictions on the order of assembly, making it impossible to reduce assembly man-hours, and making it difficult to downsize and use other models. There was a problem that it was not possible to reuse.

Therefore, the present invention has been made in view of the above-mentioned conventional problems, and its purpose is to
It is an object of the present invention to provide a document reading unit which is easy to adjust and can be easily incorporated into other models by being miniaturized and unitized.

[Means for Solving the Problems] In order to achieve the above object, the present invention includes a light source that illuminates a transmission document, a photoelectric conversion element that converts reflected light emitted from the light source and reflected by the transmission document into an electrical signal, and a transmission A reflecting mirror that guides the reflected light from the light source that is reflected by hitting the original to the photoelectric conversion element, and an optical lens that collects the reflected light and makes it enter the photoelectric conversion element, and these are assembled into one chassis. The integrated chassis is integrated into the device housing.

[Function] In the present invention, the light source, the reflecting mirror, the lens, and the photoelectric conversion element are assembled into the chassis, so that they are installed together with the chassis in the device housing as one unit.

[Example] Hereinafter, the present invention will be described in detail based on an example shown in the drawings.

FIG. 1 is a sectional view showing an embodiment of a document reading unit according to the present invention, and FIG. 2 is a plan view of the same unit. Components in the figure that are the same as those in FIG. 3 are designated by the same reference numerals, and their explanations will be omitted. In these figures, reference numeral 20 denotes a chassis fixedly disposed within the device housing 1 with a set screw 21, and the reading lens 1 is attached to the chassis 20.
0, light source 12, reflecting mirror 13 (13A, 13B, 13C)
, lens 14, photoelectric conversion element 15, shading plate 2
2, an inverter circuit board 23, a sensor board 24, etc. are incorporated, and these form the document reading unit 8.

As the light source 12, for example, an A4 size cold cathode tube is used.

The reflector 13 is a first reflector located directly below the document reading position.
a second reflecting mirror 13B that reflects the light reflected by the first anti-mirror 13A, and a second reflecting mirror 1.
The third reflecting mirror 13C reflects the light reflected by the photoelectric conversion element 3B toward the photoelectric conversion element 15. The first reflecting mirror 13A is arranged with its reflecting surface inclined at 45 degrees so as to reflect the reflected light that is reflected by the transmission original 4 substantially at right angles to the original transport direction. The second and third reflecting mirrors 13B and 13C are arranged substantially parallel to each other and facing each other, and the reflected light from the first reflecting mirror 13B is reflected twice between these two reflecting mirrors.

The lens 13 and the photoelectric conversion element 15 are disposed on the chassis 20 in a lens holder 28 which is movable and adjustable in the front-rear direction using a set screw 26 and an elongated hole 27.

In the document reading unit 8 having such a configuration, the reading glass 11, the light source 12, the reflecting mirrors 13A, 13B,
Attach 13C and the shade plate 22 to the chassis 20,
The lens 14 and the photoelectric conversion element 15 are attached to the lens holder 28.
By positioning and fixing the lens holder 28 at a predetermined position, the document reading unit 8 is assembled.
Thereafter, the chassis 20 is fixed within the apparatus casing 1 with the setscrews 21, thereby completing the assembly of the document reading unit 8 into the apparatus casing 1.

Thus, in such a document reading unit 8,
Since each component is assembled into the chassis 20 in advance and made into a unit, assembly and adjustment work can be performed separately from the device housing 1, and workability can be improved. In addition, unitization not only allows for miniaturization, but also has the advantage of being able to be incorporated into other models as a common component.

In addition, in the above embodiment, three reflecting mirrors 13A, 13B, 13
Although C is used, the present invention is not limited to this, and the number can be increased or decreased as necessary.

[Effects of the Invention] As explained above, the document reading unit according to the present invention is a unit in which a light source, a reflecting mirror, a lens, a photoelectric conversion element, etc. are incorporated into a chassis, and this unitized chassis is disposed within an apparatus housing. Since the structure is designed to allow assembly and adjustment work to be performed separately from the device housing, it is possible to reduce the number of man-hours for assembly and adjustment work, and it is also possible to reduce the size and use common parts for other models. It can be used as.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of a document reading unit according to the present invention, FIG. 2 is a plan view of the same unit, and FIG. 3 is a schematic configuration diagram showing a conventional example of the document reading unit. 1... Housing, 2... Automatic paper feed roller, 3... Pad, 4... Original to be sent, 5... Spring, 6...
Original transport path, 8... Original reading unit, 11...
Reading glass, 12... light source, 13.13A, 13B,
13C -- Reflector, 14 -- Lens, 15 -- Photoelectric conversion element, 20 -- Chassis, 21 -- Set screw, 22 -- Shade plate, 28 -- Holder.

Claims (1)

[Claims] a light source that illuminates the transmission document; a photoelectric conversion element that converts reflected light emitted from the light source that hits the transmission document and is reflected into an electrical signal; and a reflecting mirror that guides the reflected light from the light source that hits the transmission document and is reflected to the photoelectric conversion element. and an optical lens that collects the reflected light and makes it enter the photoelectric conversion element, these are integrated into one chassis, and this integrated chassis is integrated into the device housing. A document reading unit featuring: