JPH0326053A - Picture reader - Google Patents

Abstract

PURPOSE:To read a picture properly regardless of fluctuation of an information recording face by operating a mirror to make a reflected light reflected on the information recording face incident and to reflect it in a direction of a photodetector section corresponding to the fluctuation of the information recording face. CONSTITUTION:The displacement direction and the quantity of displacement are detected by a displacement sensor 58 in response to the displacement of the information recording face of an original and an output signal of the displacement sensor 58 is fetched by a control section 50. The control section 50 applies the operation control of a mobile section 60 according to the output signal or the like of the displacement sensor 58, resulting that the information recording face of the original is displaced in the thickness direction of the original, then a mirror 56b is turned or the position is moved. Since the reflection direction of the reflected light on the mirror 56b is changed, line sensors 52b-52c receive the reflected light properly. Thus, picture reading without distortion is attained regardless of the displacement of the information recording face of the original.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention is a method for reading image information by converting light irradiated onto the information recording surface of a flat recording medium on which image information is recorded into an electrical signal. The present invention relates to an image reading device.

[Prior Art] For example, in fields such as printing and plate making, flat image information recorded on the information recording surface of a manuscript (recording medium) is electrically processed in order to streamline the work process and improve image quality. However, an image scanning reading recording system is known in which an original film is created that corresponds to the image information of the original.

The image scanning reading/recording system basically consists of an image reading device and an image recording device. The main scanning signal is scanned by the optical system and converted into an electrical signal by the optical/electrical conversion element.

The image information thus converted into electrical signals is taken into the image recording device, where it undergoes processing such as gradation correction and edge enhancement according to the plate-making conditions. ) is converted into a signal and recorded and reproduced on a film made of photosensitive material.

Next, the film on which the image information is recorded is developed by a predetermined developing device, and used as a film original for printing or the like.

Among the above-mentioned image reading devices, one is conventionally known in which image information is read using a plurality of line sensors arranged in parallel at the same straight line position.
(See Publication No. 46266).

In other words, the reflected light beam obtained by main scanning the information recording surface on which planar image information is recorded is received by a photosensor array (line sensor) and converted into an electrical signal, thereby reading the image information. It will be done.

[Problems to be Solved by the Invention However, when the information recording surface is displaced in the thickness direction of the document, the distance between the information recording surface and the document changes, so it is difficult for the line sensor to properly receive the reflected light. It becomes difficult.

Therefore, there is a problem that the image is read in a distorted state, and in other words, it is difficult to read the image information accurately.

An object of the present invention is to operate a mirror that allows reflected light reflected from an information recording surface to enter and reflect it toward a light receiving section in response to fluctuations in the information recording surface, thereby responding to fluctuations in the information recording surface. An object of the present invention is to provide an image reading device that can properly read images regardless of the situation.

[Means for Solving the Problems] In order to achieve the above object, an image reading device according to the present invention includes: a light irradiation unit that irradiates light onto an information recording surface of a recording medium on which image information is recorded; A mirror that receives reflected light from the information recording surface of the irradiated light and directs and reflects the incident light toward the image scanning light receiving section, and a mirror that responds when the information recording surface is displaced in the thickness direction of the recording medium. displacement detecting means for detecting the direction and amount of displacement of the mirror; mirror operating means for changing the attitude and/or position of the mirror so as to change the direction of reflection of light incident on the mirror; It is characterized by comprising: a control means for controlling the operation of the mirror action hand in response to the displacement of the information recording surface being detected by the detection means in response to the displacement direction and displacement amount.

[Operation] In the human image reading device according to the present invention, in response to the change of the information recording surface in the thickness direction of the recording medium, the direction and amount of displacement are detected by the displacement detecting means.

The operation of the mirror operating means is controlled by the control means in accordance with the detected displacement direction and displacement amount.

Therefore, the attitude and/or position of the mirror changes in response to the displacement of the information recording surface, and the direction of reflection of light incident on the mirror changes.

[Embodiments] Next, preferred embodiments of an image reading apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

In FIG. 1, an apparatus lO to which an image reading apparatus according to the present invention is applied includes an l-th casing 12 serving as a base, and a first
A second casing 14 is provided on one side surface 12a of the casing 12 in the height direction.

The device lO is configured to move the first casing l from inside the second casing l4.
A document input section 18 mainly includes a flat document table 16 that is movable along the one side surface 1.2a of the second casing l4, and a document input section 18 that is provided in the second casing l4 and that is set on the document table l6. The main component is an image reader 822 in which image information on a flat image information recording medium is main-scanned and converted into an electrical signal.

And between the original input section l8 and the image reading section 22,
A pair of guide bars 24a and 24b are arranged parallel to each other along the one side surface 12a of the first casing 12, and both longitudinal ends of the guide bars 24a and 24b are connected to the side surface 12a of the first casing 12. One side 12
Support stands 26a, 26b and 23a provided in a,
They are each supported and fixed to 28b.

At a substantially central position where the guide bar 24a and the guide bar 24b face each other, there is a ball screw whose longitudinal ends are rotatably supported by bearings 30 and 32 provided on the one side surface 12a of the first casing 12. 34 is both guide bars 24
It is provided in a posture parallel to a and 24b.

Further, a side end portion of the ball screw 34 inside the second casing l4 protrudes from one side surface to the other side surface in the thickness direction of the bearing 32, and a pulley 36 is provided on the protrusion portion 32a.

The pulley 36 is connected to a ball screw driving motor 40 provided in the first casing l2 via a belt 38.
The ball screw 34 is engaged with a pulley 42 attached to the output shaft of the ball screw 34, so that the ball screw 34 is rotationally driven by driving the motor 40.

Note that the belt 38 is inserted through the communication hole 12b that communicates the first casing 12 and the second casing 14,
6 and a boule 42.

As the ball screw 34 is rotationally driven, the document table 16
is moved along the guide bars 24a and 24b, and the document table l6 is carried into the second casing 14, but since its structure is conventionally known, detailed explanation will be omitted (see Japanese Patent Laid-Open No. 190468/1983). (see official bulletin).

Next, the image reading unit 22 uses a line sensor (light receiving B) 52
a to 52C, L/lens 54, mirror 56a, 56b1
A transfer section 60, a light irradiation section (light irradiation means) 64, a control section (control means) 50 mainly including a microcomputer, and a displacement sensor (displacement detection means) such as a digital dial gauge, a laser displacement meter, an ultrasonic sensor, etc. )58.

The light irradiation unit 64 includes a light source 64a such as a halogen lamp, and a cylindrical lens 64c that emits illumination light L emitted from the light source 64a.
The cylindrical lens 64c focuses the illumination light L incident from the optical fiber 64b onto the document surface.

Then, the irradiated illumination light L is reflected on the information recording surface of the document, reflected toward the mirrors 56a and 56b, and further passes through the lens 54 to the line sensors 52a to 52c.
The light is received by

Here, as understood from FIGS. 2 and 3, the moving unit (mirror operating means) 60 is the mirror rotation holding mechanism 1.
00 and a mirror position moving vJ mechanism 120.

In FIG. 2, the mirror rotation holding mechanism 100 includes a frame 80 to which both longitudinal ends of the mirror 56b are fixed, and a pair of rotating shafts protruding from the frame 80 at both longitudinal ends of the mirror 56b. 82, 84 and their rotating shaft 82,
bearings 86 and 88 in which 84 is rotatably supported;
A gear 90 provided at the protruding end of one rotating shaft 82;
A pinion 94 that meshes with the gear 90 has a motor 92 provided on the output shaft.

Note that the formation positions of the rotation axes 82 and 84 are on the center line of the mirror 56b, so the mirror 56b rotates around the axis of the center line, and the mirror 56b does not displace due to the rotational movement.゛On the other hand, the operation of the motor 92 is controlled by a signal from the control section 50.
At 0, the motor 92 is driven and controlled in accordance with the signal output from the displacement sensor 58, etc.

Next, in FIG. 3, the mirror position moving mechanism 120 is
Casing 10 in which mirror rotation holding mechanism 100 is housed
2, and a casing 104 in which the casing 102 is housed.
It has

The casing 104 is provided with a pair of micrometer heads 105 and 105 that direct the mirror 56b toward the white reflective surface via the casing 102, and the spindle 1 of each micrometer head 105
A pair of coil springs 109 that constantly bias the casing 102 in a direction that resists the force of the coil springs 06 biasing the casing 102.
, 109 are interposed between the casing 102 and the casing 104.

Also, a gear 108 is provided at the base of each micrometer head 105, and each of the gears 108
, 108 , a pair of motors 110 , the output shaft of which is provided with a binion 112 that meshes with the casing 104 .
It is located outside of the

In this embodiment, a pair of micrometer heads 105 are provided, and as can be understood from FIG. However, only one position (indicated by arrow C in the figure) of the mirror 56b is biased at approximately the center in the length direction of the mirror 56b. It is also possible to configure it as follows.

Note that, like the motor 92 of the mirror rotation holding mechanism 100, the operation of each motor HO is controlled by the control unit 50 in accordance with the output signal of the displacement sensor 58, etc.

As described above, since the apparatus 10 has the mirror rotation holding mechanism 100 and the mirror position moving mechanism 120, as can be understood from FIG. changes (in the figure, P-
P direction>, the mirror 56 is moved by the mirror position moving mechanism 120.
b is movable along its own thickness direction (Q-Q direction in the figure).

In the apparatus IO configured as described above, when the information recording surface of the document is displaced along the thickness direction of the document (Z direction in FIG. 1), the direction and amount of displacement are detected by the displacement sensor 58.
The output signal of the displacement sensor 58 is detected by the control unit 5.
It is taken into 0.

The control unit 50 controls the operations of the mirror rotation holding mechanism 100 and the mirror position movement mechanism 120 in accordance with the output signal of the displacement sensor 58 and the like.

As a result, the reflection direction of the light reflected by the mirror 561) changes, so that the line sensors 52a, 52b 152c perform proper light receiving operations regardless of the displacement of the information recording surface of the document.

As described above, in this embodiment, in response to the displacement of the information recording surface of the document, the direction and amount of displacement are detected by the displacement sensor 58, and the output signal of the displacement sensor 58 is sent to the control section 50. It is captured.

The control section 50 controls the operation of the moving section 60 in accordance with the output signal of the displacement sensor 58, etc., and as a result, when the information recording surface of the document is displaced in the thickness direction of the document, the mirror 56
b performs a rotational operation or a positional movement operation. Therefore, the direction of reflection of the reflected light on the mirror 56b changes, so that the line sensors 52a, 52b, and 52c can appropriately receive the reflected light.

Therefore, distortion-free image reading can be performed regardless of the displacement of the information recording surface of the document.

In this embodiment, only the mirror 56b rotates or moves, but the mirror 56a also rotates or moves.
It is also possible to use a configuration in which the mirror 56b is rotated and/or moved together with the mirror 56b, or a configuration in which only one of rotation and positional movement is performed on the mirror 56b is also possible.

Furthermore, as can be understood from FIG. 5, it is also possible to arrange the mirror 56a at a position opposite to the mirror 56b so that the light reflected by the mirror 56a is incident on the mirror 56b.

In addition, when four or more line sensors are provided, there is a case where the operation of the mirror 56b having a length corresponding to the installation distance of the line sensors is controlled;
For example, the mirror 6b can be divided into two mirrors, each of which can be controlled in its operation.

Note that the image reading device according to the present invention is applicable even when two or more lenses 54 are provided.

[Effects of the Invention] As understood from the above description, the image reading device according to the present invention changes the direction and amount of displacement in response to the information recording surface being changed in the thickness direction of the recording medium. are respectively detected by displacement detection means.

Then, the mirror operating means is controlled in operation by the control means in accordance with the detected displacement direction and displacement amount.

Therefore, the mirror rotates and/or displaces in response to the displacement of the information recording surface, so that the posture and/or displacement of the mirror changes so that the direction of reflection of the light incident on the mirror changes.
or change position.

As a result, regardless of the displacement of the information recording surface, the reflected light from the mirror is properly received by the light receiving section, and as a result, unnecessary distortion can be avoided when reading image information.

Further, even if a shift occurs in the information recording surface due to a temperature change or the like, the mirror operates so that the light enters the light receiving section in a state in which the shift is corrected, and proper light reception is performed.

Furthermore, since errors in assembly precision of each member disposed in the optical path within the device can be corrected by rotating and/or displacing the mirror, there is no need to assemble the device with great precision. Therefore, there is also an advantage that the ease of assembling the device is improved.

[Brief explanation of drawings]

FIG. 1 is an overall schematic longitudinal sectional view of a preferred embodiment of the image reading device according to the present invention, FIG. 2 is a perspective view of the structure of the mirror rotation and holding mechanism, and FIG. 3 is a plan view of the structure of the mirror position moving mechanism. FIG. 4 is an explanatory diagram showing a state in which the mirror is rotated or moved by the mirror rotation holding mechanism and mirror position moving mechanism, and FIG. 5 is a schematic explanatory diagram showing another embodiment of the present invention. 10... Device l6... Original table 22...
- Image reading section 50...control section (control means) 52
a to 52c... Line sensor (light receiving part) 60... Moving part (mirror operation means) 64... Light irradiation part (light irradiation means) 100... Mirror rotation holding mechanism 1 system... Mirror position Mobile mechanism (spontaneous) 1st petition, -161411, August 21st, 2006 ■. In the "Detailed Description of the Invention" of the specification, on page 10, lines 2 and 3, "The shape and position of the rotation axes 82 and 84 are on the center line of the mirror 56b..." It says, ``In addition, the rotation axis 8
2. The shape or position of the rotation center of 84 is on the center line of the mirror surface of mirror 56b, and is corrected as follows. Date of amendment order “Detailed description of the invention” column of the specification subject to voluntary amendment

Claims (1)

[Claims] (1) A light irradiation unit that irradiates light onto the information recording surface of a recording medium on which image information is recorded, and a light receiving unit that receives reflected light from the information recording surface of the irradiated light and receives the incident light for image scanning. a mirror that directs and reflects light toward the mirror; a displacement detection means that detects the direction and amount of displacement in response to displacement of the information recording surface in the thickness direction of the recording medium; and light incident on the mirror. mirror operating means for changing the attitude and/or position of the mirror so as to change the direction of reflection; An image reading device comprising: a control means for controlling an operation in accordance with a displacement direction and a displacement amount.