JPS59163949A - Picture reading device - Google Patents

Abstract

PURPOSE:To prevent dust such as paper powder or the like from adhering to an optical system by containing an optical system such as mirror provided on the way of a reading optical path of an original into an enclosed case and providing freely attachably and detachably a light source to choke an opening section of the case. CONSTITUTION:An optical system such as a mirror 27, lens 28 and a photodetector or the like is accommodated in an enclosed case 21 in a picture reading device irradiating an original from a light source and making its reflected light incident to a photodetector element 29 via a mirror 27 and a lens 28 to read picture information. A cover 21a and a bottom plate 21b support a transparent plate 20 fitted to the open part 21c to read the original 19. An open part 21c for the original 19 is formed near the end of the cover 21a toward the transparent plate 20, elastic members 24, 25 are fixed along the upper and lower end parts of the open part 21c and a rod shaped light source 26 is supported to the members 24, 25. Through the constitution above, no dust such as paper powder is adhered to the optical system and the replacement of the light source is attained easily.

Description

TECHNICAL FIELD The present invention relates to an image reading device, and more particularly to an image reading device configured to guide an image to a predetermined position via a mirror.

BACKGROUND TECHNOLOGY Devices that read and record images, such as facsimile machines, are becoming more and more compact. Therefore, the image reading optical path is bent through a mirror to effectively utilize the space within the device body. Efforts have been made.

In such a device, a mirror that bends the optical path is fixed at a predetermined position within the device body via a support member.

For this reason, dust such as paper powder that has entered the inside of the apparatus adheres to the mirror, and this dust is read as an image, resulting in the inconvenience that information not present on the original is recorded.

In order to prevent such inconveniences, a structure has been proposed that covers part of the mirror to prevent dust from accumulating. However, it is not possible to completely prevent dust from entering.

Furthermore, the smaller the size, the narrower the space for mounting a light source such as a fluorescent lamp, and the more difficult it is to replace it.

Purpose The present invention has been made to eliminate the above-mentioned drawbacks of the conventional art, and an object of the present invention is to provide an image reading device configured so that dust does not adhere to the mirror and the light source can be replaced extremely easily. The purpose is

EXAMPLES Hereinafter, the present invention will be explained in detail based on examples shown in the drawings.

The figure explains one embodiment of the present invention, and the image recording apparatus, which is designated as a whole by reference numeral 1 in the figure, is equipped with a housing 2, and a cover 4 that can be opened and closed via a shaft 3 on the upper surface of the housing 2. is installed.

A recording head 6 is attached to the back surface of the free end side of the cover 4 via a leaf spring 5.

Further, a recording paper mounting frame 7 having an arcuate cross section is fixed in the housing 2 below the cover 4, and a roll-shaped recording paper 8 is accommodated within this mounting frame 7.

One end 8a of the recording paper 8 passes between the recording head 6 and a platen roller 9 in contact with the lower surface thereof, and is led outward through between upper and lower blades 1Oa101) constituting a cutter for the recording paper 8.

On the other hand, a document table 12 is rotatably attached to the side surface of the housing 2 on the side where the recording head 6 is located via a shaft 11, and extends from a horizontal position shown in the figure to a position along the side surface of the housing 90 degrees. Can be rotated within a degree angle range.

A guide plate 13i4 is arranged in the housing on the side where the document table 12 is attached, and extends in an arc shape from below to upward, separated by a predetermined distance, and its lower end is located at a position facing the document table 12. Also, conveyor rollers 15 and 16 are provided near the upper and lower ends of the guide plates 13 and 14, with parts of them facing between the guide plates 13' and 14.
Rollers 17,18 are provided adjacent to this.

The original 19 is placed on the original table 12, and the guide plate 13.1
4, between the conveyance rollers 15 and 17, and then between another set of conveyance rollers 16 and rollers 18 located on the upper side, and is guided outward.

By the way, in the middle of the guide plate 14 located inside, the document 1
An opening is formed along the width direction of 9, and a transparent plate 20 is fitted into this opening. The transparent plate 20 serves as a window for reading the document, and is made of a highly transparent glass plate.

A flat housing 21 is continuous behind the transparent plate 20.

This housing 21 consists of a cover 218 and a bottom plate 21b, which are integrated with screws 22. cover 218
One end of the guide plate 1 is located on the upper edge side of the transparent plate 20.
4, and the bottom plate 21'b is fixed to the guide plate 14 side via the connecting plate 23, and also plays the role of supporting the transparent plate 20 together with the cover 218.

On the other hand, an opening 21C is formed near the end of the cover 21a on the transparent plate 20 side along the width direction of the document, that is, the main scanning direction, and a sufficient width of the opening 21C is formed along the upper and lower edges of the opening 21C. Elastic members 24 and 25 are fixed. These members 24 and 25 support a rod-shaped light source 26 such as a fluorescent lamp, and when this light source 26 is attached, the opening 21C is closed and the housing 21 is sealed. A mirror 27 is fixed to the side surface of the housing 21 on the side away from the transparent plate 20, and the reflected light from the original 19 irradiated by the light source 26 is reflected by the mirror 27 and transmitted through the lens section 28 to the light receiving element. 29.

The light receiving element 29 electronically performs main scanning and outputs image information of the original 19 in the main scanning direction.

On the other hand, inside the housing 2 are a power supply device 30 and a circuit board 31.
．． 32 etc. are accommodated.

Since the present embodiment is constructed as described above, the recording paper 8 can be immediately accommodated in the mounting frame 7 by opening the cover 4. One end 8a of the recording paper 8 is pulled out, and the paper is placed along the platen roller 9 and above and below. Knife 10a.

10b to the outside of the housing 2, and the cover 4
When closed, the recording head 6 is pressed against the platen roller 9 by the leaf spring 5.

On the other hand, the document 19 on the document table is guided between guide plates 13, 14 by transport rollers 15, 16, and is illuminated by a light source 26 at the position of the transparent plate 2o, which is the document reading position, and the reflected light is reflected by the mirror. 27, the light is read by the light receiving element 29 via the lens section 28. Then, the recording head 6 is driven once based on the read image information, and recording is performed along the main scanning direction of the recording paper 8.

Each time one printing in the main scanning direction is completed, the platen roller 9 feeds the recording paper 8 at a predetermined pitch in the sub-scanning direction.

When the sub-scanning for one document is completed in this way, the recording paper 8 is cut by the upper and lower blades 10a and 10b of the cutter.
is disconnected.

Since this embodiment is configured as above, the mirror and other optical systems are housed in a sealed housing 21.
Dust such as paper powder does not enter from the outside, and there are no disadvantages such as adhesion to a mirror or the like and recording of an image that is not on the original.

Further, since the light source 26 is only supported by the elastic members 24 and 25, it can be attached and detached very easily, and its replacement is very easy.

Effects As is clear from the above explanation, according to the present invention, a mirror and other optical systems provided in the middle of the optical path for reading a document are housed in a sealed housing, and a long and narrow part formed in a part of this housing is used. The structure uses a rod-shaped light source that is removably attached to close the opening, which prevents dust such as paper dust from adhering to the optical system and prevents the recording of incorrect information. Replacement is extremely easy.

[Brief explanation of drawings]

The figure is a longitudinal side view illustrating an embodiment of the present invention. 1... Recording device 6... Recording head 8...
Recording paper 9...Platen roller 12...Document stand 19...Document 21...Housing
26... Light source 27 - Mirror 28... Lens section 29... Light receiving element Patent applicant Canon Co., Ltd.

Claims (1)

[Claims] In an image reading device that illuminates a document surface with a light source and makes reflected light from the document surface enter a light-receiving element via a mirror to read image information, the mirror, the light-receiving element, etc. are housed in a housing, and the housing 1. An image reading device comprising a removably rod-shaped light source so as to close an elongated opening formed along a document reading direction in a part of the image reading device.