JPH04167659A - image scanner - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an image scanner.

[Prior Art] Conventionally, in this type of image scanner, a head section for reading a document is driven by a motor via a drive gear and a drive belt or a drive wire, and these drive gears,
The drive belt, drive wires, and motor are supported by the frame. This frame is directly fixed to a holder section of an image forming apparatus or the like. As shown in Japanese Utility Model Application No. 62-19650 and Japanese Utility Model Application No. 62-98463, a damping material or the like is provided between the motor and the frame to prevent the vibration of the motor from being transmitted to the frame. It is configured.

[Problem to be solved by the invention] However, in the case of the above-mentioned configuration, the vibration noise generated by the motor alone is absorbed by the vibration damping material, but the vibration noise of the drive gear and the drive generated by driving the head with the motor are absorbed by the vibration damping material. Since the frame and holder are directly fixed, head vibration noise caused by the tension of the belt and drive wire is transmitted to the holder via the frame, resonates throughout the device, and causes problems such as color blurring when outputting images. There was a problem that there was a risk of image shift.

The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide an image scanner in which vibrations within the frame are transmitted to other parts and quickly absorbed.

[Means for Solving the Problems] In order to achieve this object, the image scanner of the present invention includes: a head section having at least a part of a reading mechanism for reading a document; a driving means for driving the head section; An image scanner that has a frame that supports a head portion and a driving means, and a holder that supports the frame, the image scanner having a positioning member that positions the frame provided on the holder, and a guard that is provided between the frame and the holder. It is equipped with a vibration member.

[Function] According to the image scanner of the present invention having the above configuration, a vibration isolating member is provided between the frame positioned and supported by the holder by the positioning member and the holder, and the vibration isolating member is provided between the frame and the holder. The driving means absorbs vibrations generated when the head is driven, and prevents the vibrations from being transmitted to the holder via the frame.

[Example] Hereinafter, an example embodying the present invention will be described with reference to FIGS. 1 to 4.

An image output device (not shown) that outputs an image read by an image scanner is equipped with a holder 23 having a U-shaped cross section on which the image scanner is placed.
In the groove 3, as shown in FIG. 1, an elastic vibration isolating member 25 is adhered to the portion where the image scanner is placed. On the other hand, a convex portion 1a that fits into the groove 23a of the holder 23 is provided at the lower part of the frame 1 of the image scanner. The holder 23 has a positioning member 24
is provided, and the frame 1 is positioned and fixed on the vibration isolating member 25 by the positioning member 24 in a state where the convex portion 1a of the frame 1 is fitted into the groove 23a of the holder 23. Therefore, a vibration isolating member 25 is provided between the frame 1 and the holder 23.
The holder 23 and the frame 1 are connected to this vibration isolating member 25.
You will be contacted through.

On the top of the rectangular frame 1, as shown in FIG. 2(a), a document platen glass 7 is placed and fixed, and at one end of the frame 1, a document platen lid 8 or a document platen glass 7 is placed and fixed. It is supported so as to be movable between the position and the open position.

Inside the frame 1, as shown in FIG. 2(b), there is a camera section 6, and guide bars 5 that are arranged parallel to each other at a predetermined interval with the camera section 6 in between are fixed to support holes 27. A full-speed mirror part 10 and a half-speed mirror part 11 are manually supported on the kite bar 5.

The full speed mirror part 10 includes a halogen lamp 14, a reflector 15 and a first mirror 1, as shown in FIG.
6 and are movable together.

The reflector 15 directs the light from the halogen lamp 14 to the document surface 2.
2 to illuminate the document surface 22. First mirror 16
reflects the light reflected on the document surface 22 in a direction toward a second mirror 17 of the half-speed mirror section 11, which will be described later.

The half-speed mirror portion 11 includes a second mirror 17 and a third mirror 18 that are arranged perpendicularly to each other.

The light incident on the second mirror 17 is reflected by the second mirror 17 and the third mirror 18, and is incident on the camera section 6.

The camera section 6 includes a parallel plate crow 19, a lens 20, and a C
It is composed of a CD 21, and a parallel plate crow 19 is attached so as to be movable relative to a lens 20. An image of the document 22 is formed on the CCD 21 by this lens 20. No matter where the full-speed mirror portion 10 is located, the distance between the document surface 22 and the lens 20 corresponding to that position is kept constant, and an image of the document surface 22 is formed on the CCD 21. Ru.

The camera section 6 constitutes a reading mechanism constituting the present invention, and the full-speed mirror section 10 and the half-speed mirror portion 11 constitute a head section constituting the present invention.

A drive shaft 3 is supported near the camera section 6 in the frame 1 via a bearing (not shown).

A drive pulley 9 is fixed to both ends of the drive shaft 3, and the drive pulley 9 is connected to the motor 2 fixed within the frame 1 via a drive belt 26. This motor 2 rotates a drive pulley 9 via a drive belt 26. A first idle pulley 12 is rotatably attached to both ends of the half-speed mirror part 11. Further, near the end of the kite bar 5 on the side away from the camera section 6, a pair of second idle pulleys 4 are rotatably supported by the frame 1. As shown in FIG. 3, the wire 13 has one end connected to the first idle pulley 12 and the second
It is fixed to the frame 1 in the vicinity of the second idle pulley 4 between the idle pulley 4 and the first idle pulley 12.
, the second idler pulley 4, the drive pulley 9, and the first idler pulley 12 in this order, and are stretched between the respective boars. The other end of the wire 13 is fixed to the frame 1 near the drive pulley 9 between the drive pulley 9 and the first idle pulley 12. Furthermore, both ends of the full speed mirror portion 10 are fixed to a wire 13 stretched between the drive pulley 9 and the first idle pulley 12.

By stretching the wire 13 between each pulley as described above, the wire 13 moves when the drive pulley 9 rotates, and the full speed mirror part 1 moves at the same speed as the wire 13.
When the half-speed mirror part 11 moves by 0, the half-speed mirror part 11 moves at 1/2 the speed of the full-speed mirror part 10. Note that this motor 2, drive pulley 9, first idle pulley 12,
The second idle pulley 4, the wire 13, and the drive belt 26 constitute a drive means that constitutes the present invention.

The operation of the image scanner configured as above will be explained.

When a document is placed on the document table glass 7 with the document surface 22 on which an image has been recorded facing down, and a start key (not shown) is pressed with the document cover 8 closed, the halogen lamp 14 lights up. At the same time, the motor 2 starts rotating,
The full-speed mirror section 10 moves along the document cover 22, and the half-speed mirror part 11 moves along the document cover 22 at half the speed of the full-speed mirror part 10. During this movement, as shown in FIG. 4, the light from the halogen lamp 14 reflected by the document surface 22 is reflected by the first mirror 16 and directed toward the half-speed mirror part 11, and 11 second mirror 17 and third mirror 18, and enters the camera section 6. As a result, the image recorded on the original surface 22 is formed on the CCD 21.

During the above operation, all vibrations generated due to the drive of the motor 6 in the frame 1 are absorbed by the vibration isolating member 25 and are not transmitted to the holder 23.

Therefore, resonance does not occur throughout the image scanner.

Therefore, in the image scanner of this embodiment, the document surface 22
The image output device can output a clear image without any lag when reading the image.

It should be noted that the present invention is not limited to the embodiments detailed above, and various changes can be made without departing from the spirit thereof. For example, the reading mechanism may be a sliding camera part, or a fixed reading mechanism and a moving document table, and the driving means may be a gear instead of a drive belt, or a belt or rack and pinion instead of a wire. The image scanner may be a color reader or a monochrome reader.

[Effects of the Invention] As is clear from the detailed description above, according to the present invention, vibrations are absorbed by the vibration isolating member and the device as a whole does not resonate, so there is no blurring in the image when reading the image. It is possible to output clear images without any problems. Furthermore, since the vibration isolating member is simply glued to either the frame or the holder, it is simple and inexpensive.

[Brief explanation of drawings]

1 to 4 show an embodiment embodying the present invention, in which FIG. 1 is a perspective view showing a portion where an image scanner is attached to an image output device to which this embodiment is applied, and FIG. 2 (a
) is a perspective view showing the frame of the image scanner, FIG. 2(b) is a perspective view showing each member in the frame, FIG. 3 is a side view showing the driving means of the image scanner, and FIG. 4 is the operation of the image scanner. FIG. In the figure, 1 is a frame, 2 is a motor, 4 is a second idle pulley, 6 is a camera unit (reading mechanism), 9 is a drive pulley, 10 is a part of a full speed mirror, 11 is a part of a half speed mirror (or more) , the head section is composed of a part of the full-speed mirror and a part of the half-speed mirror.), 12
is the first idle pulley, 13 is the wire, 23 is the holder,
24 is a positioning member, 25 is a vibration isolating member, and 26 is a drive belt (including a motor, a drive pulley, a first idle pulley,
A drive member is constituted by the second idle pulley, wire, and drive belt. ).

Claims (1)

[Scope of Claims] 1. A head section having at least a part of a reading mechanism for reading a document; a driving means for driving the head section; a frame supporting the head section and the driving means; An image scanner comprising: a supporting holder; a positioning member provided on the holder for positioning the frame; and a vibration isolation member provided between the frame and the holder. An image scanner featuring