JPH05136939A - Picture reader - Google Patents

Abstract

PURPOSE:To improve the dust proof performance of an optical unit being a picture read system. CONSTITUTION:The reader is provided with a coating member 20 comprising a rib 20a covering the surrounding of a mount part of a mirror 9b and a polyester sheet 20b enclosing a gap of the mount part of the mirror 9b adhered to the ridge of the rib 20a and with a coating member 21 comprising a rib 21a covering the surrounding a fitting part of mirrors 9a, 9c and a polyester sheet 21b enclosing the gap of the mount of the mirrors 9a, 9c adhered to the ridge of the rib 21a to enclose the gap by the coating members 20, 21. Since the gap of the mount of the mirrors or the like is almost closed, entering of dust or dirt or the like from the gap is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image reading device for obtaining an image signal by using a photoelectric conversion element.

[0002]

2. Description of the Related Art Today, image reading apparatuses are widely used in facsimile machines, copying machines and the like. As shown in FIG. 4, the structure of the image reading apparatus is such that while the originals G stacked on the top cover are separated and fed one by one by the pre-conveying roller 51 and the separating roller 52, and conveyed by the conveying roller pair 53, 54. Further, the image surface of the original G is irradiated with light from the light source 55, and the reflected light (optical image) is reflected by the mirrors 56a, 56b, 56.
CCD 5 which is a photoelectric conversion element via c and the lens 57
It is generally configured to form an image on 8 and convert it into an electric signal.

In the image reading apparatus, the mirrors 56a, 56b, 56c and a lens holder 59 having a lens 57 are mounted in an optical substrate 60 formed of sheet metal or the like, and the CCD 58 is attached to the lens holder 59.
An optical unit is constructed by attaching a CCD substrate 61 having

A pair of left and right mirror mounting holes (not shown) for mounting the mirrors 56a, 56b and 56c are formed on both side walls of the optical substrate 60. From one side of the mirror mounting hole, the mirrors 56a, 56
b and 56c are inserted into the mounting holes on the other side of the pair, and both ends are fixed by a mirror retainer (not shown) formed of a leaf spring.

[0005]

However, in the above-mentioned conventional example, since there is a gap in the mirror mounting hole of the optical substrate 60 to which the mirrors 56a, 56b, 56c are mounted, there is a gap in the middle of the mounting of the optical unit or the mounting of the optical unit. After that, dust or dirt may enter from the gap and adhere to each component in the optical unit, and white stripes or black stripes may be added to the image information when the image is read by the optical unit. was there.

Therefore, the present invention has been made to solve the above-mentioned problems of the prior art, and an object thereof is to provide a member for covering the mirror mounting portion of the optical substrate, and to improve the dustproof property of the optical unit by the member. I am trying.

[0007]

A typical means for solving the above problems and applied to the embodiments described below is to illuminate the original surface with a light source and photoelectrically convert the light image through a mirror and a lens. In an image reading device for forming an image on an element and converting it into an electric signal, an optical member for mounting the light source and a mirror, and a cover member for covering an upper portion of the optical member,
An optical unit integrated with the lens unit having the lens and the photoelectric conversion element is formed, and a covering member that covers the periphery of the mirror mounting portion of the optical member is provided, and the optical member is configured to be substantially sealed by the covering member. Characterize.

[0008]

According to the present invention, after the mirror is mounted in the optical member, the covering member covering the mounting portion of the mirror is mounted so that dust and dirt can enter through the gap of the mirror mounting portion. Therefore, the dustproof property of the optical unit can be improved.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a facsimile apparatus to which the above means is applied will be described below with reference to the drawings.

FIG. 1 is a side sectional view showing the overall construction of a facsimile apparatus embodying the present invention, FIG. 2 is a side view of an optical unit, and FIG. 3 is a top view of the optical unit. The overall structure of the facsimile apparatus according to this embodiment will be described. As shown in FIG. 1, a document conveying system A, an image reading system B, and an image recording system C.
It consists of and.

First, the document conveying system A will be described. The document transport system A preliminarily transports a plurality of documents G stacked on the upper surface of the recording cover 1 by a preliminary transport roller 2b that is in pressure contact with the separation pressing piece 2a, and separates and feeds them one by one by a separation roller 3b that is in pressure contact with the separation friction piece 3a. Then, the document G is fed by the feed roller 4b which is in pressure contact with the pressing roller 4a and the discharge roller 5 which is in pressure contact with the pressing roller 5a.
It is configured to be conveyed in the direction of arrow a at b and discharged onto the discharge tray 6. The separating pressing piece 2a and the separating friction piece 3a
The pressing rollers 4a, 5a are pressed by the leaf springs and are in pressure contact with the rollers 2b, 3b, 4b, 5b.

Next, the image reading system B will be described. The image reading system B is configured to optically read the image surface of the document G that is being conveyed from the feeding roller 4b to the discharge roller 5b. As shown in FIG. 1, the LED array 7 as a light source irradiates the image surface of the document G with light through the document glass 8 and reflects the reflected light (optical image) on a plurality of mirrors 9a,
It is configured to be reflected by 9b and 9c and guided to the imaging lens 10, and to be imaged on the CCD 11 which is a photoelectric conversion element by the imaging lens 10 to be converted into an electric signal. In the copy mode, the image information of the original G converted into the electric signal is used as the image recording system C in the facsimile apparatus of its own.
The heat-sensitive recording sheet S is used for recording, and in the facsimile mode (transmission mode), it is transmitted to the recording system of another machine. The image reading system B is unitized as an optical unit.

Next, the image recording system C will be described. The heat-sensitive recording sheet S is a roll sheet formed by winding a long sheet in a roll shape, and is stored in a roll holder 12a of the main body frame 12 in a drop-type manner. The recording sheet S is conveyed in the direction of arrow b by the platen roller 13 which is rotationally driven by a motor (not shown) which is a drive source. At this time, the thermal recording head 14 pressed against the platen roller 13 in synchronization with the sheet conveying operation is
Heat is generated in response to an electric signal (image information of the document G) sent from the image reading system B, and the recording sheet S receives 1 d.
Printing is made for each ot. After printing, the recording sheet S is guided by the guide member to the cutter portion 15, cut from the trailing edge of the image, and stacked on the reversing tray 16.

Next, the image reading system B of the facsimile machine
The optical unit for forming the above will be described in detail with reference to FIGS. FIG. 2 is a view of the present optical unit, which is the image reading system B, seen from the lateral direction. The mirror 9a,
9b and 9c have a large width (for example, 9a to 22c) so as to cope with the deviation of the reflection position due to the error of each component.
mm, 9b is 14 mm, 9c is 12 mm) and is made of glass with a thickness of about 5 mm. In the figure, 17a, 17b and 17c are mirror insertion holes, and the optical substrates 1 that are the optical members are the mirrors 9a, 9b and 9c.
8 is a hole for assembling inside the optical substrate 18.
Are symmetrically drilled on both side walls. The mirrors 9a, 9b, 9c have the mirror insertion holes 17a, 17
It is inserted from b and 17c and assembled into the inside of the optical substrate 18, and after the assembly, both ends thereof are respectively held by mirror holding plates 19a, 19b and 19c which are metal leaf springs.

Reference numeral 20 is a covering member, and the mirror 9b and the mirror holding plate 19 are provided on both side walls of the optical substrate 18.
A rib 20a formed so as to cover the periphery of b, and polyester for adhering and fixing the rib 20a to the edge of the rib 20a with a double-sided tape or the like to seal the gap of the mirror insertion hole 17b which is the mounting portion of the mirror 9b. The sheet 20 b is formed symmetrically on both side walls of the optical substrate 18. Further, 21 is also a covering member, and the covering member 20
Similarly to the mirror 9a on both side walls of the optical substrate 18,
And mirror holding plate 19a and mirror 9c and mirror holding plate 1
A rib 21a formed so as to cover the periphery of 9c, and mirror insertion holes 17a, 17 for attaching the mirrors 9a, 9c, which are fixedly attached to the edge of the rib 21a with a double-sided tape or the like.
It is made of a polyester sheet 21b for sealing the gap c. The covering members 21 are also formed on the both side walls of the optical substrate 18 symmetrically.

The upper part of the optical substrate 18 is covered with an optical cover 22 as a cover member and a manuscript glass stand 23, so that the present optical unit has a substantially sealed box shape. The LED array 7 which is the above-mentioned light source is attached to the LED holder 7a.
The ED holder 7a is fixed to the optical substrate 18 with screws or the like. Further, the original glass 8 is mounted on the original glass table 23.
Is attached and fixed with an adhesive or the like. The LED array 7 and the mirror 9c are arranged between the feeding roller 4b and the discharging roller 5b, which contributes to downsizing of the apparatus.

Further, as shown in FIGS. 1 and 2, the imaging lens 10 is fixed in the lens barrel 24 to form a lens unit. Further, the lens unit is housed in the lens holder 25 and has a structure that can be adjusted in the optical axis direction, so that the focus can be adjusted. Two
Reference numeral 6 denotes a CCD substrate, which is an optical conversion element CCD1.
1 is mounted on the lens holder 25 so that the lens holder 25 can be adjusted vertically and horizontally, and line adjustment can be performed. Further, the lens holder 25 has a structure that can be adjusted in the optical axis direction, and the optical substrate 18
It is attached to the outside of the, and the magnification can be adjusted by adjusting the optical path length. Further, the lens holder 25 covers the mounting surface of the CCD substrate 26 up to about 1 mm.

The CCD substrate 26 is attached to the lens holder 25.
When the lens is attached to the
It is attached so as to cover the CCD 11 on the substrate 26. Therefore, the imaging lens 10, the CCD 11, etc. are integrally formed by the lens holder 25.

FIG. 3 is a view of the present optical unit viewed from above. Reference numerals 27a, 27b, and 27c denote support portions, which are integrally formed on a part of the optical substrate 18, and are provided when the present optical unit is attached to the main body frame 12.
The entire optical unit is supported by the support portions 27a, 27b, 27c at the various places. Incidentally, the above-mentioned mirrors 9a, 9c
In the covering member 21 for covering the gap of the mounting portion of the above, when the polyester sheet 21b is attached and fixed to the rib 21a, the polyester sheet 21b is supported by the supporting portion 27.
It is configured to be inside the end faces of a and 27b.

[0020]

As described above, when the mirror is mounted in the optical member, the covering member is provided for covering the periphery of the mirror mounting portion, and the covering member covers the periphery of the mirror mounting portion. By doing so, the gap of the mirror mounting portion of the optical member is substantially sealed, so that it is possible to prevent dust and dirt from entering through the gap, and improve the image quality. Further, as described above, the covering member including the ribs and the polyester sheet is easy to assemble because the polyester sheet is attached and fixed to the ribs after the mirror is mounted inside the optical member.

[Brief description of drawings]

FIG. 1 is a side sectional view showing an overall configuration of a facsimile apparatus according to the present invention.

FIG. 2 is a side view of an optical unit embodying the present invention.

FIG. 3 is a top view of an optical unit embodying the present invention.

FIG. 4 is a side sectional view showing a schematic configuration of a conventional facsimile apparatus.

[Explanation of symbols]

A ... Original conveying system B ... Image reading system C ... Image recording system G ... Original S ... Thermal recording sheet 1 ... Recording cover 2a ... Separation pressing piece 2b ... Preliminary conveying roller 3a ... Separation friction piece 3b ... Separation roller 4a ... Pressing roller 4b ... Feeding roller 5a ... Pressing roller 5b ... Discharging roller 6 ... Discharging tray 7 ... LED array 8 ... Document glass 9a, 9b,
9c ... Mirror 10 ... Imaging lens 11 ... CCD 12 ... Main body frame 12a ... Roll holder 13 ... Platen roller 14 ... Thermal recording head 15 ... Cutter 16 ... Reversal tray 17a, 17b, 17c ... Mirror insertion hole 18 ... Optical substrate 19a, 19b, 19c ... Mirror holding plate 20 ... Covering member 20a ... Rib 20b ... Polyester sheet 21 ... Covering member 21a ... Rib 21b ... Polyester sheet 22 ... Optical cover 23 ... Original glass stand 24 ... Lens barrel 25 ... Lens holder 26 ... CCD substrate 27a, 27
b, 27c ... Support section reference number 2124029

Claims (2)

[Claims] 1. An image reading apparatus which illuminates an original surface with a light source, forms an optical image on a photoelectric conversion element via a mirror and a lens, and converts the image into an electric signal. A member, a cover member that covers the upper portion of the optical member, and an optical unit that is integrated with the lens unit that has the lens and the photoelectric conversion element, and a covering member that covers the periphery of the mirror mounting portion of the optical member. An image reading device, wherein the image reading device is provided and is configured to be substantially sealed by the covering member. 2. The image reading apparatus according to claim 1, wherein the optical unit has a closed structure.