JP2974563B2 - Copier - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a copying apparatus for reading an original using a line sensor.

[0002]

2. Description of the Related Art As copiers have become more multifunctional and colorized, CC has been increasing.
Copying machines that read a document with a line sensor such as D, process the read image information, record a latent image on a photoreceptor with a semiconductor laser or the like, develop it, and then transfer it to paper to obtain a copied image. I have.

In such a copying machine, a reader unit for reading a document and a printer unit for recording a copied image are functionally independent, and the performance thereof is specified for each.

[0004]

Incidentally, since the reader section is usually fixed to the upper part of the printer section, it is mutually affected by vibration.

FIGS. 3A and 3B show a conventional reading unit (lens, line sensor), wherein FIG. 3A is a front view, and FIG.
FIG. 3A is a view of (a) viewed from below, and FIG. 3C is a side view of (a).

As shown in FIG. 3, the CCD is provided between the two metal plates 80 and 90 fixed to the lens 60 and the CCD 100 to adjust the center position and the inclination with respect to the optical axis of the imaging lens. Is fixed by soldering. At this time, it is necessary to solder at least three places (for example, 90a, 90c, 90e) in order to fix the two metal plates 80 and 90, and the larger the distance between the soldered places, the more accurate the fixation. be able to. However, if the distance L1 between two adjacent fixed portions is large, the printer tends to vibrate due to the influence of the printer vibration.

Further, since the mirrors and guide rails in the leader section are elongated, they tend to vibrate due to the vibration of the printer section.

When the guide rail vibrates up and down (perpendicular to the original surface), the mirror sliding on the guide rail also vibrates up and down, causing a deviation between the optical axis of the mirror and the optical axes of the imaging lens and the CCD. And the reading position on the document changes. This is the same as the change in the speed of the mirror that scans the original, and the read image expands and contracts in accordance with the oscillation period, and a problem arises in that periodic unevenness appears on the image.

[0009]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a reader unit for reading image light from a document by a line sensor via a lens, and a recording unit on a recording material based on information from the reader unit. A printer unit for forming an image, and in a copying apparatus in which the reader unit is mounted on the printer unit, the line sensor is fixed to the lens via a holder with a plurality of fixing units. The distance between two adjacent fixed portions of the plurality of fixed portions is substantially equal to or less than the effective length of the line sensor.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS.

FIG. 1A is a plan view of a reader unit for reading an original, FIG. 1B is a front view of FIG. 1A, and FIG. 1C is a side view of FIG. FIG. 2 is a diagram showing the line sensor of FIG. 1 and its mounting plate.

In FIG. 1, reference numeral 1 denotes a reader unit, 2 denotes a housing of the reader unit, and 2-a denotes a document table. Reference numeral 3 denotes a mirror for scanning the original by a driving source (not shown), and reference numerals 4 and 5 denote mirrors for guiding light from the original to a line sensor 10 such as a CCD in conjunction with the mirror 3. Reference numeral 6 denotes a lens for forming an image of light from a document on the line sensor 10, reference numeral 7 denotes a lens holder for holding the lens 6, and reference numeral 8 denotes a lens holder 7.
The sensor holder mounting plate 9 is fixed to the sensor holder 9 to which the line sensor 10 is fixed. The sensor holder mounting plate 8 and the sensor holder 9 each have ten soldering fixing portions (9a to 9j). As shown in FIG. 2, the distance L2 between two adjacent fixed portions of the plurality of fixed portions is smaller than the effective length L of the line sensor. Here, the effective length refers to the length in the main scanning direction in which the line sensor can actually receive light and read an image. 11 is a first mirror base holding the mirror 3, 12 is a second mirror base holding the mirrors 4 and 5, 1
Reference numeral 3 denotes a guide rail on which the first and second mirror bases 12 and 13 slide. In the scanning direction of the mirror, both ends of the guide rail are fixed by a fixing member 21, and a substantially central portion is also fixed by a fixing member 14. Reference numeral 15 denotes a leader fixing member for attaching the reader unit 1 to the printer unit 50. Reference numeral 16 denotes a rubber bush that is an elastic member. When the reader unit 1 is fixed to the printer unit 50 by screws 17, vibration of the printer unit is transmitted by the rubber bush. Is prevented from being done. Further, since the screw 17 and the bush 16 are fixed to a plane parallel to the document surface and a plane perpendicular thereto, the position of the reader unit 1 is accurately fixed to the printer unit 50. Reference numeral 18 denotes a vibration storage member, which is arranged at four corners below the reader. Reference numeral 20 denotes a housing of the printer unit 50, which has a plane 20-a parallel to the document surface and a plane 20-b provided behind the apparatus and perpendicular to the document surface.

Although not shown, a photoreceptor, a charger, an exposure unit, a developing unit, a transfer unit, a fixing unit,
A paper transporter and the like are provided, and a well-known recording operation is performed.

Next, a state during operation of the copying machine will be described. During the operation of the copier, especially when copying is continuously performed, the printer unit 50 also feeds the paper, develops, transfers, and prints the original even when the reader unit 1 scans the mirrors 3, 4, and 5 to read the original. Various vibrations occur due to fixing and the like. The vibration generated here tries to be transmitted to the housing 2 of the reader unit via the housing 20 of the printer unit. However, most is absorbed by the vibration absorbing member 18 and the rubber bush 16 disposed between the reader section and the printer section. The guide rail 13 and the CCD 1
0 vibrates, but since the guide rail 13 has a substantially central portion fixed to the rail fixing member 14, the length and weight of the vibrating guide rail are each reduced to about 1/2, and the amplitude is reduced due to the physical properties of the beam. The amplitudes are 1/8 and 1/2 respectively, and as a result, the amplitude is 1/16 of the case where the center is not fixed, and the mirrors 3, 4, and 5 are hardly affected by vibration.
The vibration transmitted to the line sensor 10 is also smaller than the effective length L of the line sensor 10 because the distance L2 between two adjacent fixing members of the plurality of fixing members that fix the space between the sensor holder mounting plate 8 and the sensor holder 9 is made smaller. The effects of vibration can be almost eliminated. Note that even if the distance between the fixing members is substantially equal to the effective length of the line sensor, there is no practical problem of the influence of vibration. In the experiment, the effective length L = 5
When a 0 mm line sensor, a sensor holder mounting plate made of an iron plate having a thickness of 1 to 2 mm, and a sensor holder are used, when the distance between the fixing members is 80 mm (L1), unevenness on the copied image is remarkable due to the influence of vibration. There was,
When L2 = 40 mm, the influence of vibration was hardly observed, and unevenness on the image was hardly recognized.

[0015]

As described above, according to the present invention, it is possible to eliminate the influence of the vibration from the printer unit in the reader unit, and to perform good image reading and image formation.

[Brief description of the drawings]

FIG. 1 is a diagram showing a copying apparatus according to an embodiment of the present invention.

FIG. 2 is an enlarged view of a reading unit in FIG. 1;

FIG. 3 is a diagram showing a conventional reading unit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Leader part 6 Lens 8 Sensor holder mounting plate 9 Sensor holder 9a-9j Fixing member 10 Line sensor 13 Guide rail 14 Rail fixing member 50 Printer part

Claims (2)

(57) [Claims] 1. A printer unit comprising: a reader unit for reading image light from a document by a line sensor via a lens; and a printer unit for forming an image on a recording material based on information from the reader unit. In the above-described copying apparatus having the reader unit mounted thereon, the line sensor is fixed to the lens via a holder by a plurality of fixing units, and a distance between two adjacent fixing units of the plurality of fixing units is: A copying apparatus characterized in that the length is substantially equal to or less than the effective length of the line sensor. 2. The scanner according to claim 1, wherein the reader has a scanning member for scanning the original, and a guide member for guiding the movement of the scanning member. The guide member has both ends and a substantially central portion fixed in the scanning direction. 2. The copying apparatus according to claim 1, wherein