JPS607266A - Scanner - Google Patents

Abstract

PURPOSE:To attain low bulk, low cost and reduction in driving torque of a device itself by forming an image of an original image to a picture receptor with variable power, conducting the titled conversion of an optical axis with respect to the center of an image forming optical system and moving a mirror to a position where the image forming with variable power is conducted on the optical axis subject to tilt conversion. CONSTITUTION:The image of the original is to be read with shrinking so as to be contained on a recording paper sheet of A4 size smaller than B4 size. An optical axis 18 is tilted to a position in broken lines around the lens center C in this device and the 2nd mirror 15 placed on the X position on unmagnification reading is moved to the Y position toward the arrow on the reading with shrinking. While the 2nd mirror 15 is moved from the X to the Y position, the mirror 15 is tilted to allow the reflected light from the 2nd mirror 15 to be directed on a lens 16 tilted in the position in figure, that is, so as to pass the optical axis 18 through the lens center C, and also the incident reflected anglealpha of light of the 2nd mirror becomes equal.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention is directed to a method in which a document is used as imaging light for a photoreceptor.
The present invention relates to a scanning device for reading and scanning an original image.

(Prior Art) Among scanning devices, for example, a facsimile reading and scanning device as shown in FIG. 1 has been proposed. This scanning device transports a document 0 in the direction of the arrow by a pair of document transport rollers 1.2, and at this time, an illumination light source 3 illuminates the document in a direction perpendicular to the direction of movement, and the document illumination section illuminates the document 0 in the direction of the arrow. The reflected light image is made incident on the imaging lens 5 via the mirror 4,
The imaging light emitted from the imaging lens 5 is received by a photoreceptor 6 such as a CCD reading element, thereby reading the original image.

By the way, in the recording device on the receiving side used in combination with such a facsimile reading/scanning device, the recording paper is set to a certain size such as A4 size. If a large B4-sized original is to be read and sent to the receiving side, the image of the B4-sized original will not fit on A4-sized recording paper, so for example, the image forming lens of the reading scanning device shown in Figure 1. 5
-, an image photoreceptor 6 such as a CCD reading element is moved in the direction of the optical axis by 1/1 second, and the original image is reduced and read.

However, such a document reading/scanning device requires a relatively long distance to move the imaging lens 5 and the image receptor 6, which makes the device itself complicated and more complicated. It has the disadvantage of requiring large driving force.

In addition, multiple images can be captured without moving the imaging lens or image receptor.
It has also been proposed to prepare an imaging lens according to the variable magnification and selectively switch it, but with this method,
This method has the disadvantage of increasing the cost of the device because it requires expensive imaging lenses for a plurality of tubes or a complicated lens switching mechanism.

(Objective) It is an object of the present invention to provide a scanning device which eliminates the drawbacks of the conventional device described above and which can reduce the bulk, cost, and driving force of the device itself.

(composition) The configuration of the present invention will be described below based on examples.

FIG. 2 shows a schematic configuration of a facun milli reading and scanning device, which is an example of application of the present invention, with reference numerals 11.12 and 11.12.
13 is a document illumination light source such as a fluorescent lamp, and 14 is a first document conveying roller pair driven by a step motor or the like.
15 is the second mirror, 16 is the imaging optical system 1
17 shows an example of an imaging lens, and 17 shows a reading element such as a CCD array, which is an example of an image receptor.

Here, assuming that the size of the document to be read is, for example, A4 size, in this case, the receiving side uses the same A4 size.
Images are recorded on four sizes of recording paper, and the same-magnification reading is performed on the reading element 17. In this case, the second mirror 15 and the imaging lens (hereinafter referred to as lens) are used. ) 16, reading element 17, etc. are placed at the positions shown in the actual model on the lens optical axis 18.

Assuming that the original O is being transported in the direction of the arrow by the original feeding action of the pair of original transport rollers 11 and 12, during this time,
The illuminated document illumination light source 3 illuminates the surface of the document, and by this illumination and movement of the document, document illumination scanning is performed.

During this scanning, the reflected light image from the original O is reflected by the first mirror 1.
4, the reflected light image from this mirror 14 further enters the second mirror 15, and the reflected light image from this mirror 15, whose direction has been changed to the left, passes through the lens 16 as imaging light. is incident on the reading element 17, and at this time, the reading element 17
The original image is read.

The above is a case where the original image is formed at the same magnification on the reading element 17, and the second mirror 15, lens 16, reading element 17, etc. The optical path from the document surface to the reading element 17 is along a solid line.

In this case, an image of an A4-sized document is recorded on the same A4-sized recording paper on the recording side.

Here, assuming that the size of the document to be read now is, for example, B4 size, this document image is recorded 111111.
Assume that reduced reading is performed in order to fit onto A4 size recording paper, which is smaller than B4 size.

Here, when performing reduction reading, as the reduction ratio increases, the optical path length becomes longer than when reading at the same magnification, so in order to satisfy this, the apparatus of the present invention has
Tilt the optical axis 18 around the center point bC of the lens to the dotted line position,
And the second one placed at the X position when performing the same size reading
The mirror 15 is moved in the direction of the arrow to the seventh position 1d for reduction reading.

Here, when moving the second mirror 15 from the X position to the Y position, if the inclination of the mirror remains unchanged, the reflected light from the second mirror 15 at the Y position will move along the optical axis 18 shown by the solid line. Therefore, the reflected light is no longer directed toward the lens 16.

Therefore, while moving the second mirror 15 from the X position to the Y position, the mirror 15 is moved, and as shown in FIG.
In other words, the light 1111I+18 was made to pass through the lens center C, and the incident and reflection angles (χ) of the light incident on the second mirror were made to be different from each other.

In addition, in FIG. 2, when the second mirror 15 moves from the X position to the Y position, the optical axis 18 is also oriented to the position shown by the broken line, so the second mirror 15 also tilts clockwise to some extent. It turns out. Therefore, in order to set the second mirror 15 in the nodding position shown in FIG. 3, while moving the second mirror 15, tilt it slightly counterclockwise relative to the optical axis. Just do it like this.

On the other hand, as for the reading element 17, in FIG. 2, the direction of the optical axis 18 is tilt-converted to the position shown by the broken line, so that it is displaced from the position shown by the solid line to the position shown by the broken line. Since it is not possible to do
As shown in FIG. 3, the reading element 17 displaced to the position shown by the broken line is brought closer to the lens 1G by a distance δ along the optical axis 18.

In this case, it is also possible to fix the reading element 17 and move the lens 16 (C).

As described above, the second mirror 15, lens 16, reading element 17, etc. are respectively arranged at optical positions for performing reduction reading, and by this arrangement, reduction reading@1. You can do this. Therefore, for a B4 size manuscript,
For example, images can be recorded on A4 size recording paper.

By the way, when performing reduced reading, it is necessary to change the inclination of the optical axis 18 as shown in FIG. If you configure it to run separately from 1. As the drive system becomes extremely complex, it also becomes difficult to manage its positional accuracy. Therefore, in the embodiment described below, the second
The mirror 15, lens 16, reading element 17, etc. are integrally provided in a storage base described below, and this storage base is configured to swing about the optical axis, and the second mirror 15, reading element 17, etc. The displacement is driven in relation to.

In FIG. 4, the storage base 2o is the scanning device main body 21.
In contrast, it is swingably supported by a pivot 22. The center point C of the pivot 22 also coincides with the lens center C in FIG. A second mirror 15, a lens 16, a reading element 17, etc. placed on the optical axis 18 are stored in the storage base 2o.

A cam 23 is provided on the side of the storage base 20,
This cam 23 is rotated by, for example, a motor (not shown) installed in the storage base 20, and rotates at a predetermined angle.
By rotating, the storage base 20 can swing around (?C) while swinging about the optical axis 18.

For example, as shown in FIG. 2, the storage base 20 is pivoted so that the optical axis 18 is tilted from the solid line position to the broken line position. Note that the reference numeral 24 is a guide roller provided on the side of the scanning device main body 21, and when the cam 23 rotates, the guide roller 24 rotates as a result of the rotation of the cam 23. In this case, such guide roller 2
4 can be moved in the vertical direction.
The 00 helix angle may be finely adjusted as appropriate.

Inside the storage base 20 is a mirror tilting machine shown in FIG.
j 25 is provided, and this mechanism 25 is connected to rack rods 26 . Pinion 27. Mirror bracket 28. The mirror mounting member 29 is provided with a mirror mounting member 29, a central spring 3o, etc., and the mirror mounting member 29 is mounted several times apart from the second mirror 15 via a cushion portion 4119. Central thought spring 30
is locked at one end to the mirror mounting member 29 and at the other end to an immovable pin 3G provided outside the mirror bracket 28.

FIG. 7 shows a plan view of a mirror drive mechanism equipped with a reading element displacement mechanism, and the pinion 27 in this mechanism is directly connected to a drive motor 33.
When the rack rotates, the rack rod 26, which is engaged with the rack rod through the pinion 27, moves in the direction of the optical axis 18 within the storage base 2o shown in FIG. Note that the drive motor 33, reading element 17, etc. in FIG.
It is provided within the storage base 20.

Here, when reading a B4 size document, that is, when performing reduced reading, first, the cam 23 shown in FIG. 2o rotates in the i+ force direction with respect to the optical axis 18 using the pivot 22 as a fulcrum, and the direction of the light IDI+ J s is switched from the solid line position to the broken line position in FIG.

The drive motor 33 in FIG. 7 rotates, and with this rotation, the rack rod 26 in FIG. 5 moves to the right in the figure to the position shown in FIG. 6 via the pinion 27. That is, the mirror bracket 28 moves and the second mirror 1
5 is at X position 1rt in Figure 2 and Y position j! -Move to t.

h' In Figure 5, a pair of stopper bins 37 and 38 are fixedly provided on the mirror bracket 28, and the mirror mounting member 29, which is pivotally connected to the pivot 31, is rotated at the position IQ shown in the figure.
When the left stopper bin 37 is in the position, the mirror part 29 of the left stopper bin 37 is locked, and the rotation of the mirror in the direction τJ part 29 is stopped by the elasticity of the central spring 3°. . In this state, the second mirror 15 is placed in the actual deaf position shown in FIG.

When the mirror bracket 28 moves from the position shown in FIG. 5 to the position shown in FIG. Rotate clockwise until it hits the stopper bin 38 (1), and it is held in this tilted position.Due to the mirror's tilted position, the reflected light from this mirror is directed toward the lens 16. With the above configuration, the tilt conversion of the second mirror 15 during full size reading and reduced reading can be performed with a simple configuration.
(It is actually possible to do this.

On the other hand, in FIG. 7, due to the drive of the drive motor 33,
When the rack rod 26 moves to the right in the figure, the bin 39
A lever 40 connected to the rack rod 26 via the pivot shaft 4
It is designed to horizontally rotate in the direction of the arrow around 2,
Along with this, the reading element holder 44 is connected via the connecting rod 43.
moves in the direction of the arrow, and the reading element 17 moves in a direction approaching the lens 1G by a distance δ in FIG. As described above, the second mirror 15. The lens 16, the photosensitive element 17, etc. are held in the position shown in FIG. 3, and in this position reduced reading is possible.

As described above, in the apparatus according to the embodiment of the present invention, the optical axis is changed when performing variable magnification reading, so the second mirror J5, the reading element, etc. are placed at a certain distance. There is no need to move the scanning device, and therefore, compared to the conventional device shown in FIG. 1, the scanning device itself can be made smaller in size, and its driving force can also be reduced.

In addition, in this embodiment device, in addition to the first mirror j4, a second mirror j4 is also provided.
Since a mirror 15 is provided and the mirror 15 bends and directs the reflected light from the first mirror 14 to the left, the device itself can be further reduced in size. In addition, since only one imaging lens is required, it is possible to reduce the cost of the apparatus compared to a system in which a plurality of lenses are used and switched between them.

Furthermore, in the device of this embodiment, while moving the second mirror 5, its nodding position is changed, and these two movements, combined with the action of the central thinking spring 300, cause the rack rod 26 to move. Since the structure is achieved by simply moving the drive system, the drive system can be made into an extremely fRi element.

Therefore, in the scanning device configuration shown in FIG. 2, during reduction reading, the second mirror J5 is moved in the direction of the arrow, and
The tilting function of this mirror is changed to achieve a reduction image forming function, but in addition to this, there is another mirror located on the right side of the second mirror 15 on the optical axis extension shown by the solid line. A reduction reading mirror (not shown) is provided so that when the optical axis 18 is switched from the solid line to the broken line position, the position of the reduction reading mirror 1 is in the position of the mirror 15 shown in FIG. , and the mirror 1 used for the same-magnification reading in FIG.
This can also be achieved by having a configuration in which the optical axis 5 is rotated and retracted from the optical axis 18 indicated by a broken line.

However, with this configuration, two second mirrors are required, one for equal-magnification reading and one for variable-magnification reading.Moreover, the mirror for equal-magnification reading cannot be rotated from the optical axis. A mechanism for evacuation is required.

In contrast, this scanning device can perform both reading at the same magnification and variable magnification (both readings) using a single mirror, which simplifies the device configuration and also achieves a low-cost device function. can do.

By the way, FIG. 8 shows a specific embodiment of the second mirror pivot I mechanism, in which the rack rod 26 is connected to the storage base 20.
The optical axis 18 (fourth
Reference I! It can be moved freely in any direction. On the other hand, a square hole 201 provided in the storage base 20 faces a cylindrical support portion 21a of the scanner main body, and this cylindrical support portion 21a
A support plate 55 to which the immovable bottle 36 is attached is fixed by screws 56.

One end of the central thinking spring 30 is locked to the immovable pin 36, and the other end of this spring is locked to a pin 54 fixed to the mirror mounting member 29. The mirror mounting member 29 is
It is pivotally connected to the mirror bracket 28 by a pivot IIjlII31, and is swingable around the pivot 31. A cushion member 19 can be mounted on the mirror mounting member 29, and several second mirrors 15 can be mounted on the cushion member 19.

The mirror bracket 28 is fixed to the rack rod 26 and moves integrally with the rack rod 26.

The mirror bracket 28 has stopper plates 57 and 58.
Adjustment screws 61 and 625 are screwed into four prongs by screws 59 and 60, and are screwed into stopper plates 57 and 58.
The movement position of 8 can be adjusted.

After this adjustment, the stopper plates 57, 58 are fixed to the mirror bracket 28 by screws 59, 60.

The stopper plates 57, 58 regulate the swinging position of the mirror mounting member 29, and achieve the same function as the stopper bins 37, 38 shown in FIG. In the embodiment shown in Fig. 5, the structure is such that the movement of the tube bins 37, 3g cannot be adjusted in the lateral direction, but in the embodiment shown in Fig. 8, the movement of the stopper plates 57 and 58 can be adjusted. As a result, the inclination angle of the second mirror 15 can be finely adjusted.
Even if there are variations in the precision of the materials, this can be adequately dealt with.

(Effects) According to the present invention, the scanning device itself can be made smaller and smaller, and the driving force of the optical system can be reduced. Since each of the mirrors for directing is aligned at one point, it is possible to simplify the tR configuration and reduce the burr of the device itself.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of an example of a conventional scanning device, FIG. 2 is a configuration diagram of a scanning device according to an embodiment of the present invention, and FIG. Figure 4 is a diagram showing an example of a rocking mechanism for the storage base, Figure 5 is a diagram showing an example of a mirror tilting mechanism, and Figure 6 is a diagram showing an example of the mirror tilting mechanism. FIG. 7 shows a state in which the second mirror is in the variable magnification reading position in the tilting mechanism.
This figure is a plan view of an example of a mirror moving mechanism provided with a reading element moving mechanism, and FIG. 8 is an exploded perspective view showing an example in which the mirror tilting mechanism is further embodied. 15... Second mirror as a mirror, 16... Imaging lens as an imaging optical system, 17... Reading element as an image photoreceptor, 18... Optical axis, 0... Original document. Agent Kabayama −￥:1～.゛飄i′、; 、'
- 杢 4 figure - 100 r, thread J), 5 net tri -1-E MM” (self a) 1988 1 (January 5 1'1 1988 Patent Order No. 11 / + 049 No. 2 Invention Name scanning device [r't '3 Addendum 11'?'?1 'Relationship with old'1 (R+ 1;? H1 applicant's name 1'/
I; ([; 7 /l J Hayashi j (Meisho 21)
-4 Agent (l2 Tokyo RII III: Ill Tani-ku Kyodo 4
-]-+-+ No. 5 No. 4 Mei 1111 A;'s ``Invention,!
Y'Simple explanation'' σ) (``5(1) Add the following sentence on a new line between lines 17 and 18 on page 4 of the specification. [Note that for the reading element 17 y IH'; Regarding the description of reading or scanning, the reading element (41 is actually used to read a reduced image of the original document, and it may be confused with reduced reading, etc., which will be described later), so it is explained here for convenience. ”―,
This uses the term "same-size reading." From now on, the explanation will be continued based on this premise, and the term "same-magnification imaging" that will appear later will be treated in the same way. (2) Delete the text from after "4shi" in the 4th line of page 7 to before "3rd" in the 6th line of the same page, and add ". Depending on the inclination angle of the shaft 18, the angle will be around f, or with respect to the I angle with respect to the mirror 15, the position X' will be smaller than the position X with respect to the axis, Since the inclination of the optical axis of the mirror 15 at the Y position is smaller than that at the X position, the second mirror 1
5 in the Y position; a posture that satisfies the conditions like C;
That is, substitute ``-(3) 1st (``ro.'' σ in the 1st line of page 1) Next, [4゛Year 1.11i1 [I) Motor 331m, Top->'UiJS' l l”a(7)7'j
A23Q1%IIJ, lukewarm, force ls2:
(The dedicated JL, P IJJ motor may be omitted.)

Claims (1)

[Claims] A scanning device that causes a reflected light image from a document to enter a mirror, and causes an image photoreceptor to receive the reflected light from the mirror as imaging light via an imaging optical system, the mirror; The imaging optical system and the image (2) photoreceptor are placed on the optical axis of the imaging optics, and when the original image is focused on the image photoreceptor at variable magnification, the optical system is In this regard, the optical axis is transformed, and the mirror is moved to a position TiT on the optical axis whose tilt has been transformed, where variable magnification imaging is performed, and the reflected light from the mirror is transformed into an image. A scanning device characterized in that it is positioned so as to point toward an optical system.