JPH07203152A - Close contact image sensor - Google Patents

Abstract

PURPOSE:To reduce the cost of the sensor and to improve the reliability by forming a read glass plate to be a transparent cylinder so as to allow the cylinder to be freely turned to a read optical system, thereby reducing a friction of the glass plate with respect to a roller in contact with a reading part. CONSTITUTION:Both ends of a cylinder glass plate 1 is supported in a free turning way on an outer circumference of fixed disk members 7, 8 fixed to a frame, and each of the fixed disk members 7, 8 is respectively fixed to a facsimile equipment main body 9. Thus, the cylinder glass plate 1 can be turned around a read optical system 100. Thus, the cylinder glass plate 1 acts like a reading glass plate and a read position is at a contact point between a roller and an original when the cylinder glass plate l is integrated to the facsimile equipment. When the original is read, the original is carried by the roller and the cylinder glass plate 1 is turned around the outer circumference of the fixed members 7, 8 by its carrying force. Thus, the friction force between the original and the cylinder glass plate 1 is much reduced and the carrying of the original is smoothed, then a small torque of the roller is enough.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image scanner for reading an image of an original such as characters, figures and graphs,
In particular, the present invention relates to a contact image sensor that reads an image in close contact with a document.

[0002]

2. Description of the Related Art Conventionally, a contact image sensor of this type is
As shown in FIG. 5, the light source 62, the lens 63, and the light receiving element 6
4, a reading optical system, a frame 61 to which the reading optical system is fixed, and a reading glass plate 65 fixed to the frame 61.
It was fixed at 1 and could not move.

Using the contact image sensor shown in FIG.
When the reading device is configured, it is necessary to dispose the roller 67 at or near the reading position 66 on the reading glass plate and bring the original 10 into close contact with the reading glass plate 65.

However, the reading glass plate 65 and the roller 67 are used.
When there is no document between the rollers 67 and the reading glass plate 6
5, and the driving torque of the roller 67 increases,
Since it is necessary to increase the torque of the motor that drives the roller 67, the cost of the device and the noise increase. Further, since a force in the document feeding direction is applied to the reading glass plate 65, the reading glass plate 65 may shift or the mounting position of the entire sensor may shift.

[0005]

As described above, in the conventional contact image sensor, since the reading glass plate is fixed to the optical system frame, a large frictional force is exerted between the reading glass plate and the roller in contact with the reading glass plate. However, there is a problem in that the cost of the device increases and the reliability decreases.

An object of the present invention is to provide a contact image sensor which realizes cost reduction of the apparatus and improves reliability by reducing the frictional force with the roller contacting the reading portion.

[0007]

According to the present invention, in a contact imager sensor for reading an original by reflected light when light is emitted while closely contacting the original, a reading fixed on a device frame or other fixed object. A contact image sensor including an optical system and a rotatable transparent cylindrical body having the reading optical system inserted therein, and a position on the outer peripheral surface of the transparent cylindrical body that comes into contact with the original becomes a reading position of the reading optical system. Is obtained.

It is desirable that the reading optical system is fixed to the apparatus frame or another fixed object via a fixing member, and the transparent cylindrical body is rotatably held by the fixing member.

[0009]

Embodiments of the present invention will now be described in detail with reference to the drawings.

1A and 1B show a contact image sensor according to an embodiment of the present invention. FIG. 1A is a front view and FIG. 1B is a perspective front view. 2 is a sectional view of the contact image sensor of FIG. 1 taken along the line AA.

In FIG. 1, a reading optical system 100 including a light emitting diode array 3, a lens array 4, a light receiving element array 5 and a frame 2 to which these arrays are fixed is inserted in a transparent cylindrical glass 1. Cylindrical glass 1
Both ends of the disk-shaped fixing members 7 and 8 to which the frame 2 is fixed
It is rotatably held on the outer circumference of the fixing member 7, and the fixing members 7 and 8 are fixed to the facsimile apparatus main body 9, respectively. Therefore, the cylindrical glass 1 can rotate around the reading optical system 100.

The frame 2 has a frame portion 21 to which the light emitting diode array 3 is fixed, a lens array 4 and a frame portion 22 to which the light receiving element array 5 is fixed, which are integrally formed by plastic molding. . The frame portion 21 includes the protruding portions 71, 8 of the fixing members 7, 8.
It is fixed at 1.

The light emitting diode array 3 includes a plurality of light emitting diodes 3-1, 3-2 arranged in parallel with the main scanning axis.
, 3-n, and the light emitted from these light emitting diodes is uniformly applied to the reading position (line) 6 parallel to the main scanning axis. The reading position 6 is located on the surface of the cylindrical glass 1, and the reflected light from the reading position is coupled to the light receiving element 50 in the light receiving element array 5 by the lens array 4. In order to make the reading optical system 100 compact, the angle at which the optical axis of the light emitting diode array 3 and the optical axis of the lens array 4 intersect is set to 90 degrees or less. The lens array 4 and the light receiving element array 5 are composed of a plurality of minute lenses arranged in the main scanning axis direction according to the resolution and a plurality of light receiving elements for receiving light from each of the minute lenses.

Balls 11 are fixed or rotatably embedded in the outer peripheries of the fixing members 7 and 8 at equal intervals, and both ends of the cylindrical glass 1 are mounted on these balls to facilitate rotation. The fixing members 7 and 8 are the outer flanges 7
It is fixed to the facsimile apparatus main body 9 via 2, 82.

The cylindrical glass 1 plays the role of a reading glass, and when it is incorporated in a facsimile apparatus, the reading position 6 is set at the roller 12 and the original 10 as shown in FIG.
At the contact point. When the document 10 is read, the document 10
Is conveyed by rollers 12, and the cylindrical glass 1 also rotates around the outer periphery of the fixing members 7 and 8 by the conveying force. Therefore, the frictional force between the original 10 and the cylindrical glass 1 is extremely small, and the original 10 is smoothly conveyed, so that the rotational force of the roller 12 can be small.

FIG. 4 is a partial sectional view showing the second embodiment of the present invention. In the figure, the reading optical system 100 is shown in FIG.
Is the same as. The frame 2 is fixed to the fixing member 13,
The fixing member 13 is fixed to the facsimile apparatus main body 9. The cylindrical glass 1 is rotatably fixed to a fixing member 13 via a disc 14. As in this embodiment, the cylindrical glass 1 is fixed on the fixing member to which the reading optical system 100 is fixed.
It may be rotatably provided not directly but through an inclusion (disk 14). Further, a one-way clutch may be interposed between the disk 14 and the fixing member 13 so that the disk 14 can always rotate only in the document feeding direction.

In the present invention, a transparent acrylic cylinder or another transparent cylinder may be used instead of the cylindrical glass 1. Also,
The structure for rotatably fixing the transparent cylindrical body to the fixing member is not limited to this embodiment. Further, another light source may be used instead of the light emitting diode array 3 of the reading optical system.

[0018]

As described above, according to the present invention, since the reading glass is a transparent cylindrical body and is free to rotate with respect to the reading optical system, there is an effect that a large torque is not required for the roller.

[Brief description of drawings]

FIG. 1 shows a contact image sensor of an embodiment according to the present invention, (a) is a front view, and (b) is a transparent front view.

FIG. 2 is a cross-sectional view taken along line AA of the contact imagen sensor of FIG.

FIG. 3 is a cross-sectional view when reading a document with the contact image sensor of FIG.

FIG. 4 is a partial sectional view showing a second embodiment of the present invention.

FIG. 5 is a cross-sectional view showing document reading by a conventional contact image sensor.

[Explanation of symbols]

 1 Cylindrical glass 2 Frame 3 Light emitting diode array 4 Lens array 5 Light receiving element array 6 Reading position

Claims (5)

[Claims] 1. In a contact imager sensor for reading an original by reflected light when light is applied while closely contacting the original, a reading optical system fixed to a device frame or another fixed object and the reading optical system are internally provided. And a rotatable transparent cylindrical body inserted into the transparent cylindrical body, and a position on the outer peripheral surface of the transparent cylindrical body that comes into contact with the original is a reading position of the reading optical system. 2. The reading optical system is fixed to the apparatus frame or another fixed object via a fixing member, and the transparent cylindrical body is rotatably held by the fixing member. 1 contact image sensor. 3. The reading optical system includes a light source that irradiates the reading position with light, a light receiving unit that receives reflected light from the reading position, and a frame that fixes the light source and the light receiving unit. The contact image sensor according to claim 2, wherein the frame is fixed to the fixing member. 4. The contact image sensor according to claim 1, wherein the transparent cylindrical body is cylindrical glass. 5. The contact image sensor according to claim 2, wherein the transparent cylindrical body is coupled to the fixing member via a one-way clutch means and rotates in only one direction.