JPS61269459A - Original reader - Google Patents

Abstract

PURPOSE:To make it possible to output a new phase to the printers of different resolving power by one original reader by providing an optical variable power means that changes the magnification of reading of an original responding to the designated dot density by the movement of a zooming mechanism placed between an original and an image pickup element. CONSTITUTION:Real magnification is a reader is calculated from an inputted magnification and the dot density of a printer. Then, the position of a lens 18 corresponding to real magnification is calculated. The difference between present position of the lens and new position of the lens is the moving distance of the lens 18. Then, it is discriminated whether the moving distance is positive or negative. When it is positive, CW (moving direction in the case of positive) is the moving direction. When it is negative, the code of moving distance is made positive, and CCW (direction opposite to CW) is the moving direction. Then, a present phase is outputted to a lens motor M2. After queuing for a specified time, new phase is outputted. The moving distance is decreased by 1 and judged whether the moving distance becomes 0 or not.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a document reading device.

(Prior art) A document reading device reads the density of a document using an image sensor,
After performing predetermined binarization processing on the read data, the output device (
(printer, etc.).

(Problems to be Solved by the Invention) By the way, printers currently being commercialized for the output of document reading devices have various dot densities (for example, 2
40, 300, 400, 480 dots/inch). However, the output of the document reading device is at a constant dot density.

Therefore, for printers with different dot densities, document reading devices corresponding to each printer are required.

As a document reading device that can be connected to multiple types of printers with different dot densities, there is a document reading device that converts the pixel density electrically after storing image data in memory (Japanese Patent Application Laid-open No. 58-182366, JP 58-184871, JP 58-2006
(See Publication No. 60).

That is, by adapting electrical magnification to changes in dot density, it becomes possible to make one reading device compatible with a plurality of types of printers. However, electrical scaling reduces image quality, especially when enlarging.

An object of the present invention is to provide a document reading device capable of responding to changes in density by moving a lens.

(Means for Solving the Problems) The document reading device according to the present invention includes an image sensor that detects the density of the document, an output designating device that specifies the dot density of an output signal, and a scanning device that scans the document for reading the document. and an optical magnification means that changes the magnification for scanning the document according to the density, and a signal from the image sensor. It is characterized by being equipped with a binarization conversion means for performing predetermined binarization processing and an output.

(Function) Dots of a printer which is an output device by moving a lens (Embodiment) An embodiment of the present invention will be explained in the following order with reference to the drawings F and 7a. In addition, in this embodiment, it is possible to specify the soto density (instead of setting the magnification).

a image reader l] Internal structure of the image reader c, 11f Main f. A halogen lamp 2 as a light source (irradiates the original 6 placed on the J1 original glass 4).The halogen lamp 2 is equipped with a reflecting mirror 8 and a book mirror 10. is sequentially reflected by the first mirror 12, second mirror 14, and third mirror 16, and then passes through the lens 18 and becomes a one-dimensional C O D (imaging device) 2.
Inject into ().

CCr) 2 (11, CCI) The position and angle of the holding parts 1 and 1-1 are adjusted by the holding part 22. Also, CC
I) Holding section 22 and lens 18 (attached to J moving table 24).

Adjustment of the magnification is performed by moving the movable table 24 in the optical axis direction using the motor M2.

Focus adjustment is performed by moving the CCI 20 in the optical axis direction using a focus adjustment motor 26 attached to a moving table 24.

When scanning the original 6, the light source 2 and the mirrors 12 to 16 are moved in the scanning direction by a slider (motor M), as is well known.

(b) Internal structure of image reader FIG. 3 is a schematic block diagram of a circuit for detecting the density of a document.

Various human output signals are connected to Cl) [J30, which controls document density detection. The input signal is as follows. dot signal (for example, 240.

300, 400) are signals for setting the resolution of the printer. The magnification signal is a signal that sets the magnification for image reading. The start signal is a signal to start a reading operation. The following human input signals are input manually from an operation panel (not shown).

Further, the lens position signal is a signal that is output when the lens 18 is at the initial position. The slider fixed position signal is
This is the signal that is output when the slider is in the normal position.

The document leading edge signal is a signal indicating that the slider is not aware of any irregularities at the document leading edge.

Sugyan motor M, lens motor M2 and pin l-
Adjustment motor 2 (1 is a pulse motor, and each pulse motor driver 3 4 , 3 6 , 5
0 through C P jJ 3 (driven by +.

The exposure lamp signal is a signal to turn on the exposure lamp 2.

The signal from the image sensor 20 is converted from an analog signal to a digital I pino'1 signal by the binarization circuit 38, and is outputted to the outside through the output circuit 40.

The output circuit 40 outputs or blocks the binary signal to the outside according to an output control signal outputted by CI) tJ 3 (l).

(C) Main flow of variable magnification reading The flow of variable magnification reading in this embodiment is shown in the flowchart “1” in Fig. 1.
-Explain using Char 1.

When the power is turned on, first, initial settings are performed (step P2). Next, the lens motor M returns the lens to the initial position (same magnification position) (Step I) 4), and the scan motor M returns the slider to the predetermined position (Step P6) 3. In the example ('',
It deals with changes in optical magnification, including changes in l·t density and changes in magnification. First, it is determined whether or not there is a change in dot density (step P10). If there is a change, the lens motor M moves the lens and CCI to the new position)
is moved U (step I"+2), and returns to step I]10.

Next, it is determined whether there is a change in magnification (step I)+4)Q If there is a change, the lens is moved to a new position U (step PI2), and the process returns to 0 for step I. Details of lens movement are explained in section (d).

Next, it is determined whether or not the start signal was manually input (step I'16). If not, the process returns to step P10. As soon as the input is received, the document will be scanned (
Step P18). When the scan is completed, step P
l Return to O. Details of the scan are explained in section (e).

((j) Lens movement Regarding lens movement (step PI2), see the diagram in Figure 4.
7-Explain in detail using charts.

It is calculated from the actual magnification in the reading device or the manually input magnification and the printing density of the printer (step P20).

Here, 2401.Soto is used as the basic magnification. The actual magnification of 240 dots) is 1x the actual magnification,
It will be the same size as 480 dots or double the actual magnification.

Next, determine the position of the lens 18 corresponding to the actual magnification (
Step P22). Next, calculate the difference between the current lens position and the new lens position obtained in step
(step P24).

Next, it is determined whether the moving distance is 11- or negative (step P26). If positive, cw ((shifting direction) in case of iE is set as the moving direction (step P27
).

If negative, change the sign of the distance traveled to positive and 1. (Step II
)28), CCW (direction opposite to 'CW) is taken as the movement direction (step 029).

Next, the current phase of r' is output to the lens motor M, j2 (Snap P30). After waiting for a predetermined time (Step P32), a new phase is output (Step P34).Move Subtract the distance by 1 Step I) 36
), it is determined whether the fg moving distance has become 0 (step I') 37). If not, return to step (2) 30 and move further. When the specified distance has been moved,
Stop the lens motor M (step P38)
. Then, the focus adjustment motor 24 moves the CCD 20 so that the difference in detected density between the black and white patterns of the reference pattern 28 provided on the document glass is maximized, thereby performing focus adjustment (step P39).

(e) Scan The flow of scan (step 1) 18) will be explained using the flowchart in FIG.

First, the moving direction is set to CW (here, the scanning direction) (step l-) 40). Next, calculate the motor speed relative to the actual magnification (Step P42), and set the calculated value in the interval timer so that a timer interrupt occurs every required time (Step P44).
. Here, allow timer interrupts (step P4
6). The timer interrupt will be explained later using FIG.

Next, start scanning. At ν, the light lamp 2 is turned on and exposure of the original is started (step P50).

Next, the slider is moved by Sugi A and motor M and waits until it reaches the leading edge of the document (step I) 52). When the document leading edge signal is output, the output of the signal from the image sensor r-20 to the outside is started (step P54). Next, it is determined whether scanning for a predetermined distance has been completed (step P56). This predetermined distance is set based on the dot density and magnification. When the scan is completed, the image sensor 20
1. End the output of the signal to the outside. (Step I)58)
, the exposure lamp 2 is turned off (step P59).

Then move the slider back. First, set the moving direction to CCW (here, return direction) (step 1) 60),
Set the return speed in step I)62), set the interval timer in step P64), and start moving the J slider using the step motor M1.

Wait for the slider to return to its normal position (step P66).

When the slider returns to the normal position and outputs the normal position, the timer interrupt is set to M+l, L (step 1) 68.
Stop scan motor M, II L (step P6
9), Return.

Next, the timer interrupt for driving the scan motor M will be explained with reference to the flowchart of FIG. When there is an interrupt by the interval timer between step I]50 and step P68, first, the current phase of scan motor M1 is output to scan motor M1 (
Step P70). Then, the next phase is set for the next timer interrupt (step P72). The next phase is determined by the direction of movement. And then return.

(Effects of the Invention) One document reading device can output to printers with different resolutions.

In addition, scaling operations can be performed at the same time. in this case,
When enlarging an image, the image quality is improved compared to electrical magnification.

[Brief explanation of drawings]

Figure 1 shows the main phase of 'rjJ variable magnification [! -'s) [No chart. Fig. 2 (J is a sectional view of the document reading device. Fig. 3 is a schematic diagram of the internal structure of the document reading device). Fig. 4 is a diagram of lens movement [J-chart]. Figure 5 is the J-chart of scans 3 and 6.
The figure is a "no chart" of the timer interrupt. 2 Exposure J+it, 6 Original, 18 Lens,
20 ・CCD, 26 Focus adjustment motor. Patent Applicant Minolta Camera Co., Ltd. Representative Patent Attorney Two idiots mentioned above No. 43 No. 3z Fig. 5, IC'cy> Oh, = 6□ 077. . -,, P58,000 deaf characters...9shi15 5zetamo,>ㅅ2share8e P59≦ - JP-A-6L-269459 (6) Figure 6

Claims (1)

[Claims] (1) An image sensor that detects the density of the original, an output specifying means that specifies the dot density of the output signal, a scanning means that scans the original, and a zoom mechanism that is placed between the original and the image sensor. It is equipped with an optical variable magnification means that changes the magnification of document reading according to a specified dot density by movement, and a binarization conversion means that performs predetermined binarization processing on the signal from the image sensor and outputs it. A document reading device characterized by: