JP2937017B2 - Image input device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image input device, and more particularly to an image input device capable of reading a document or the like as image data.

[0002]

2. Description of the Related Art A first conventional example is a contact type image scanner, as disclosed in Japanese Patent Application Laid-Open No. Sho 62-147577. In this conventional example, the body is brought into close contact with the image to be read,
After passing through several reflecting surfaces, the image is read by a linear image sensor. It is used for reading bar codes and the like. When reading a two-dimensional image, the main body is moved while being brought into close contact with the main body, and the movement amount is measured using a roller and an encoder, and the two-dimensional image is read by synchronizing the drive timing of the linear image sensor with the movement amount. ing.

A second conventional example is a flatbed type scanner, as disclosed in Japanese Patent Application Laid-Open No. 1-269360. In this conventional example, an original to be read is placed on an original plate made of platen glass or the like, and the reflection surface is moved in parallel along the original plate, thereby synchronizing the drive timing and the amount of movement of the linear image sensor to obtain a 2D image. Is reading.

[0004]

The first conventional example of the contact type image scanner has no problem if the object to be read, such as a barcode, is small and one-dimensional. Since the main body is moved and read, the input image data is distorted. In addition, it is said that an apparatus for reading a document such as A4 or A3 becomes large in size.

In the second conventional example, personalization and portability are difficult due to increase in size and cost of the apparatus.

[0006]

An image input apparatus according to the present invention comprises: a reflecting surface for reflecting reflected light of an image to be read in a desired direction; a reflecting surface rotating means for rotating the reflecting surface;
Cut to a predetermined size and fixed to the reflecting surface rotating means
Optical disk substrate facing this optical disk substrate
Fixed to the main body of the optical disk
An optical pickup capable of detecting a groove groove; a reflection surface rotation angle measurement means for measuring a rotation angle of the reflection surface; and an optical pickup for condensing the reflected light from the reflection surface. A condensing lens, a photoelectric receiving element for receiving the measurement light condensed by the condensing lens, and measurement by the optical pickup.
Tracks corresponding to the track grooves of the optical disk substrate
Locking error signal and driving timing of the photoelectric receiving element
Drive control of the photoelectric receiving element in synchronization with
And a driving circuit for controlling the driving of the photoelectric receiving element.

[0007]

[0008]

Further, the image input apparatus of the present invention includes a reflective surface for reflecting a desired direction reflected light image to be read, a reflective surface rotating means for rotating the reflective surface, the reflected is cut to a predetermined size Rotation of the reflection surface, comprising: an optical disk substrate fixed to a surface rotating means; and an optical pickup fixed to the apparatus main body so as to face the optical disk substrate and capable of detecting a track groove of the optical disk substrate.
A reflecting surface rotational angle measuring means for measuring the angle, the reflecting surface rotating means and the speed control based on the tracking error signal corresponding to the track grooves of the optical disc substrate which is measured by the <br/> optical pickup A reflection surface rotation control circuit for rotating at a constant speed, a condenser lens for condensing light reflected from the reflection surface, a photoelectric light receiving element for receiving measurement light condensed by the condenser lens, and And a photoelectric light receiving element driving circuit for driving and controlling the light receiving element by sampling for a predetermined time.

Further, the image input apparatus of the present invention comprises a reflecting surface for reflecting reflected light of an image to be read in a desired direction, a reflecting surface rotating means for driving the reflecting surface to rotate, a reflecting surface cut to a predetermined size, A rotation angle of the reflection surface, comprising: an optical disk substrate fixed to a rotating means; and an optical pickup fixed to the apparatus main body so as to face the optical disk substrate and capable of detecting a track groove of the optical disk substrate.
A reflecting surface rotational angle measuring means for measuring degrees, the optical pickup at the reflection surface rotating means speed control to the basis of the tracking error signal corresponding to the track grooves of the optical disc substrate to be measured to a constant speed rotation A reflection surface rotation control circuit, a condenser lens for condensing light reflected from the reflection surface, a photoelectric light receiving element for receiving measurement light condensed by the condenser lens, and a light-receiving element measured by the optical pickup. A photoelectric light receiving element driving circuit for controlling the driving of the photoelectric light receiving element by accurately synchronizing the tracking error signal with the drive timing of the photoelectric light receiving element.

[0011]

Next, the present invention will be described with reference to the drawings. FIG. 1 is a configuration diagram showing a first embodiment of the present invention,
FIG. 1A is a side view of this embodiment, and FIG. 1B is a top view of this embodiment. Referring to FIG. 1, an image input apparatus according to this embodiment includes a reflection surface 2 for reflecting reflected light of an image to be read in a desired direction, and a Voice Coil Motor (hereinafter, VCM) 7 for driving the reflection surface 2 to rotate.
And an optical disk substrate small piece 6 cut to a predetermined size and fixed to the rotating arm 9, and the optical disk substrate small piece 6
A CD-ROM optical pickup 5 fixed to the main body 1 so as to be opposed to the main body 1 and capable of detecting a track groove of the optical disc substrate small piece 6; and a reflection surface rotation angle measuring means for measuring the rotation angle of the reflection surface 2; A condenser lens 3 for condensing the reflected light from the reflection surface 2, and the condenser lens 3
Linear image sensor 4 that receives the measurement light collected by the
A tracking error signal (hereinafter referred to as a TE signal) corresponding to a track groove of the optical disk substrate piece 6 measured by the CD-ROM optical pickup 5 and a linear image sensor 4
And a CCD drive circuit 101 for controlling the drive of the linear image sensor 4 by accurately synchronizing the drive timing with the CCD drive circuit 101.

FIG. 2 shows that the image input device of this embodiment is A4
The figure shows how to read an original 200 which is a document printed on paper or the like. FIG. 3 is a schematic diagram showing a reflection surface rotation driving means such as the CD-ROM optical pickup 5 and the VCM 7. Referring to FIG. 2 and FIG. 3 together with FIG. 1, a reflection surface 2, a condenser lens 3, and a linear image sensor 4 are arranged in a main body 1 as shown in the figure. The reflecting surface 2 is fixed to a rotating shaft 8, and the rotating shaft 8 is attached to the main body 1 by a ball bearing or the like.
It is fixed to. One end of the rotating shaft has a VCM coil 7
The VCM 7 including the VCM 1 and the VCM magnet 72 and the rotating arm 9 are fixed. The optical disk substrate small piece 6 is fixed to the tip of the rotating arm 9. CD-R
The OM optical pickup 5 is fixed to the main body 1 so that the objective lens 51 faces the optical disk substrate small piece 6. The condenser lens 3 and the linear image sensor 4 are connected and fixed by a light-shielding jig 11 so that external light does not enter. A reading window 10 made of a transparent material such as acrylic or a filter that transmits only light of a predetermined wavelength is provided on the lower surface of the main body 1 below the reflecting surface 2.

The VCM drive circuit 103 drives the VCM 7 to rotate at a substantially constant speed by open loop control. Thereby, when the reflection surface 2 is driven to rotate in the direction indicated by the arrow A,
The reading line 201 moves and scans the original 200 in the direction of arrow B. The optical pickup drive circuit 102 is a CD-R
Focus servo control is performed on the objective lens 51 of the OM optical pickup 5 with respect to the optical disk substrate small piece 6, and the track groove of the optical disk substrate small piece 6 is output as a TE signal. The track groove direction of the optical disk substrate small piece 6 is indicated by an arrow C.
Is fixed to the tip of the rotating arm 9 so as to be perpendicular to the direction indicated by. When the rotation axis is driven to rotate by the VCM 7 in the direction indicated by the arrow A ′, the optical disk substrate small piece 6 moves in front of the objective lens 51 in the direction of the arrow C. As a result, the optical pickup drive circuit 102 outputs to the CCD drive circuit 101 a number of TE signal pulses corresponding to the amount of movement of the optical disk substrate piece 6 passing in front of the objective lens 51. The CCD drive circuit 101 reads and drives the linear image sensor 4 in synchronization with the TE signal pulse.

FIG. 4 is a diagram showing the relationship between the rotation angle of the rotating shaft 8, the amount of movement of the optical disk substrate piece 6 relative to the objective lens 51, and the amount of scanning movement of the reading line 201 on the original 200. When the rotating shaft 8 rotates by Δθ [rad], the moving distance of the optical disk substrate small piece 6 fixed at l [mm] from the rotation center with respect to the objective lens 51 is Δx [mm], and h [mm] below the rotation center. The amount by which the reading line 201 moves on the original 200 in the
m], there is a relationship of l · Δθ = Δx (1) h · 2Δθ = ΔX (2) Therefore, from Expressions (1) and (2), ΔX = (2h / l) · Δx (3)

For example, when scanning an A4 document in the vertical direction with h = 400 [mm], the scanning angle θ of the reflection surface 2 is about 0.36 [rad]. Assuming that the number of pixels to be read in the vertical (scanning) direction is 3000 pixels and the track pitch width of the optical disk substrate piece 6 is 1.6 [μm], from equation (1), 1 · 0.36 = 3000 × 1.6 [μm] ∴1 = 13.3 [mm]. Furthermore, the linear image sensor 4 has 20
If a pixel with a size of 00 pixels is adopted, an A4 document becomes 3000 × 2
It can be read as image data of 000 pixels.

FIG. 5 is a block diagram showing a second embodiment of the present invention. FIG. 5A is a side view of this embodiment, and FIG.
(B) shows a top view of this embodiment. Referring to FIG. 5, the image input device of this embodiment includes a reflecting surface 2 for reflecting reflected light of an image to be read in a desired direction, a VCM 7 for driving the reflecting surface 2 to rotate, and a cutting and rotating device having a predetermined size. An optical disk substrate small piece 6 fixed to the arm 9; a CD-ROM optical pickup 5 fixed to the main body 1 so as to face the optical disk substrate small piece 6 and capable of detecting a track groove of the optical disk substrate small piece 6; -R
A VCM drive circuit 103 for controlling the speed of the VCM 7 and rotating the VCM 7 at a constant speed based on the TE signal corresponding to the track groove of the optical disc substrate piece 6 measured by the OM optical pickup 5.
A condensing lens 3 for condensing light reflected from the reflecting surface 2, a linear image sensor 4 for receiving measurement light condensed by the condensing lens 3, and a linear image sensor 4 And a CCD driving circuit 101 that controls driving by sampling.

The optical pickup drive circuit 102 outputs a number of TE signal pulses corresponding to the amount of movement of the optical disk substrate small piece 6 in front of the objective lens 51 to the VCM drive circuit 10.
Output to 3. The VCM drive circuit 103 measures the number of TE signal pulses or the time between TE signal pulses input within a unit time, and based on this measures the speed feedback control of the VCM 7. Thereby, the VCM 7 is driven to rotate at a constant speed with high accuracy. The CCD drive circuit 101 drives the linear image sensor 4 for a sampling time Δt [s].
For example, when h = 400 [mm] in FIG. 4 and the A4 document is scanned in the vertical direction and read in one second, the VCM drive circuit 103 sets the VCM 7 to an angular velocity of about 0.36 [rad /
s]. When the number of read pixels in the vertical direction is 3000, the CCD driving circuit 101 sets the linear image sensor 4 to Δt = 1/3000 = 33 [μs].
The sampling drive may be performed for a certain time.

FIG. 6 is a block diagram showing a third embodiment of the present invention. FIG. 6A is a side view of this embodiment, and FIG.
(B) shows a top view of this embodiment. Referring to FIG. 6, the image input apparatus of this embodiment includes a reflection surface 2 for reflecting reflected light of an image to be read in a desired direction, a VCM 7 for driving the reflection surface 2 to rotate, and a VCM 7 cut to a predetermined size and rotated. An optical disk substrate small piece 6 fixed to the arm 9; a CD-ROM optical pickup 5 fixed to the main body 1 so as to face the optical disk substrate small piece 6 and capable of detecting a track groove of the optical disk substrate small piece 6; -R
A VCM drive circuit 103 for controlling the speed of the VCM 7 and rotating the VCM 7 at a constant speed based on the TE signal corresponding to the track groove of the optical disc substrate piece 6 measured by the OM optical pickup 5.
And a condensing lens 3 for condensing the light reflected from the reflecting surface 2, a linear image sensor 4 for receiving the measuring light condensed by the condensing lens 3, and a CD-ROM optical pickup 5 for measurement. And a CCD drive circuit 101 for drivingly controlling the linear image sensor 4 by accurately synchronizing the obtained TE signal with the drive timing of the linear image sensor 4.

The optical pickup drive circuit 102 outputs a number of TE signal pulses corresponding to the amount of movement of the optical disk substrate piece 6 in front of the objective lens 51 to the CCD drive circuit 1.
01 and the VCM drive circuit 103. The VCM drive circuit 103 measures the number of TE signal pulses or the time between TE signal pulses input within a unit time, and based on this measures the speed feedback control of the VCM 7. This allows
The VCM 7 is driven to rotate at a constant speed with high precision. The CCD drive circuit 101 reads and drives the linear image sensor 4 in synchronization with the TE signal pulse.

In the above three embodiments, the CD-ROM optical pickup 5 and the optical disk substrate small piece 6 are used as the reflection surface rotation angle measuring means for measuring the rotation angle of the reflection surface 2. Instead of 6, a small piece in which a groove of a minute pitch is formed which can detect a difference in reflection coefficient by the CD-ROM optical pickup 5 may be used. Further, an optical sensor capable of detecting such a groove may be used instead of the CD-ROM optical pickup 5. Further, although the VCM 7 is used as the reflecting surface rotating means for rotating and driving the reflecting surface 2, for example, a DC motor or a stepping motor may be used.

[0021]

As described above, according to the present invention,
The reflecting surface for reflecting the reflected light of the image to be read in a desired direction is rotationally driven, the rotation angle of the reflecting surface is measured, the reflected light from the reflecting surface is collected, and the collected measurement light is received. By driving and controlling the photoelectric receiving element, a two-dimensional image can be read from a place several tens of centimeters away from a document to be read without touching by a user. In addition, by driving the reflecting surface to rotate with high precision, it is not necessary to move the reflecting surface or the photoelectric receiving element in parallel, and it is possible to reduce the size of the apparatus.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a first embodiment of the present invention. FIG. 1 (a) is a side view of this embodiment, and FIG. 1 (b) is a top view of this embodiment.

FIG. 2 is a diagram showing a situation in which the image input device of this embodiment reads a document which is a document printed on A4 paper or the like.

FIG. 3 shows a CD-ROM optical pickup and V
It is a figure which shows the outline of reflection surface rotation drive means, such as CM.

FIG. 4 is a diagram showing a relationship between a rotation angle of a rotation shaft, a moving amount of a small piece of an optical disc substrate with respect to an objective lens, and a scanning moving amount of a reading line on a document in this embodiment.

FIGS. 5A and 5B are configuration diagrams showing a second embodiment of the present invention. FIG. 5A is a side view of this embodiment, and FIG. 5B is a top view of this embodiment.

FIGS. 6A and 6B are configuration diagrams showing a third embodiment of the present invention. FIG. 6A is a side view of this embodiment, and FIG. 6B is a top view of this embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body 2 Reflection surface 3 Condensing lens 4 Linear image sensor 5 CD-ROM optical pickup 51 Objective lens 6 Optical disk substrate small piece 7 VCM 71 VCM coil 72 VCM magnet 8 Rotation axis 9 Rotating arm 10 Reading window 11 Light-shielding jig 101 CCD drive Circuit 102 Optical pickup driving circuit 103 VCM driving circuit 200 Original 201 Reading line

Claims (3)

(57) [Claims] 1. A reflecting surface for reflecting reflected light of an image to be read in a desired direction, a reflecting surface rotating means for rotating the reflecting surface, and a reflecting surface rotating means cut to a predetermined size.
Optical disk substrate fixed to the optical disk substrate and the optical disk substrate
The optical disk base is fixed to the apparatus body so as to face the optical disk base.
Optical pickup that can detect track grooves on a plate
A reflecting surface rotational angle measuring means for measuring the rotation angle of the reflecting surface comprising bets, a condenser lens for condensing said reflected light from said reflecting surface, which is condensed by the condenser lens a photoelectric light receiving element for receiving the measuring light, said optical pickups
The track groove of the optical disk substrate measured by
The corresponding tracking error signal and the drive of the photoelectric
Operation timing is precisely synchronized with the photoelectric receiving element.
An image input device, comprising: a driving circuit for driving and controlling the photoelectric receiving element driving circuit for driving and controlling the photoelectric receiving element. Wherein a reflecting surface of the reflected light is reflected in a desired direction of the image reading, a reflecting surface rotating means for rotating the reflective surface, the optical disc which is fixed to the reflective surface rotating means is cut to a predetermined size A substrate and an optical pickup fixed to the apparatus main body so as to face the optical disk substrate and capable of detecting a track groove of the optical disk substrate ;
Reflection surface rotation for measuring the rotation angle of the reflection surface provided
Rolling and angle measuring unit, a reflecting surface rotation control circuit for constant speed rotation of the reflecting surface rotating means based on the tracking error signal corresponding to the track grooves of the optical disc substrate speed control to be measured by the optical pickup, wherein A condenser lens for condensing the light reflected from the reflecting surface, a photoelectric light receiving element for receiving the measurement light condensed by the condenser lens, and a photoelectric light receiving element for driving and controlling the photoelectric light receiving element by sampling for a fixed time An image input device comprising: an element driving circuit. 3. A reflecting surface for reflecting reflected light of an image to be read in a desired direction, a reflecting surface rotating means for driving the reflecting surface to rotate, and an optical disk substrate cut to a predetermined size and fixed to the reflecting surface rotating means. provided with an optical pickup that can this optical disk substrate is fixed to the apparatus body so as to face to detect the track grooves of the optical disc substrate
Reflection surface rotation angle for measuring the rotation angle of the reflection surface
A degree measurement unit, a reflecting surface rotation control circuit in which the optical pickup in the reflective surface rotating means speed control to the basis of the tracking error signal corresponding to the track grooves of the optical disc substrate to be measured is constant speed rotation, the reflection A condensing lens for condensing light reflected from the surface, a photoelectric light receiving element for receiving measurement light condensed by the light collecting lens, a tracking error signal measured by the optical pickup, and the photoelectric light receiving element An image input device comprising: a photoelectric light receiving element driving circuit that controls the driving of the photoelectric light receiving element by accurately synchronizing the driving timing of the photoelectric light receiving element.