JPS58100569A - Picture information reader - Google Patents

Abstract

PURPOSE:To keep a picture output and a picture element size constant, by providing a switching mechanism for a plurality of kinds of optical filters, and setting the carrying speed of a picture information paper and the storage time of a charge coupling element suitable for each optical filter. CONSTITUTION:A reading section 5 of a picture information paper 1 has a paper feeding section running the paper 1 in a constant speed by combining a pulse motor 8 and drive rollers 9, 9', and has a light source irradiating reading light to the paper 1 through the combination of a light source 10 and a transparent plate 11, and also a photoelectric conversion section which applies photoelectric conversion to a reflected light from the paper 1 through the combination of a reflecting mirror 12 changing the reflected light from the paper 1 to the prescribed direction, an optical filter 13, a lens 14 and a charge coupling element 15. For the optical filter 13, a plurality of kinds of optical filters having different transmission wavelengths are used by switching, and the carrying speed of the paper 1 and the storage time of the element 15 is set according to the filters.

Description

Detailed Description of the Invention Technical Field of the Invention The present invention relates to an image information reading device that converts optical information on an ITiI image information paper into an electrical signal and reads it. The present invention relates to an image information reading device which is capable of switching between a plurality of different types and which maintains the reading video output and pixel size constant even when switching.

B. Background of the Technology In image information reading devices such as optical character reading devices, facsimile machines, and copying machines, an optical filter and a charge coupling are used in a photoelectric conversion unit that converts optical information on image information paper such as a form into an electrical signal Kf. It has an element. Since the charge-coupled device has a sensitivity peak near the wavelength of red light or infrared light, a red filter or an infrared filter is usually used as the optical filter. In this case, there is no problem if all the information such as letters and line diagrams on the image information paper is in a color other than red, but there is a growing demand to read t19 characters, line diagrams, seals, etc. written in red. Ta. At this time 1
If a red filter is used, the red characters, diagrams, seals, etc. will be transmitted through the red filter and will become the same as the red color of the surrounding background, and will not be visible as characters at all. Therefore, when a green filter, which is a complementary color to red, is used, the red characters, line diagrams, seals, etc., appear as black characters, line diagrams, etc., and can be read as image information. However, since the amount of light transmitted through the green filter is only about one-third of the amount of light transmitted through the red filter, the sensitivity of the charge-coupled device falls to about one-third of that when using the red filter.

Therefore, if the transport speed of the image information paper is the same as when using the red filter, the image output voltage for reading the charge coupled device will drop to about one-third. If you want the Eirin output to be the same as that of the red filter, you can increase the accumulation time of the charge-coupled device by about 3 times, but in this case the pixel size in the sub-scanning direction will be increased by about 3 times. Put it away. Therefore, there is a need for an image information reading device that can maintain the same video output as the red filter even when switching to the green filter and keep the pixel size constant.

C6 Purpose of the Invention The present invention addresses the above-mentioned circumstances and makes it possible to switch the optical filter of the photoelectric exchange unit to a plurality of types with different transmission wavelengths, and even when this switching is performed, the reading image remains unchanged. It is an object of the present invention to provide an image information reading W&placement capable of keeping output and pixel size constant.

According to this invention, the structure and purpose of the D0 invention is to have a paper feeding section that transports the image information paper by combining a motor and a drive roller, and irradiates the above-mentioned information paper with reading light. an image information reading device comprising: a light source unit for controlling the image information; and a photoelectric conversion unit for photoelectrically converting the reflected light from the image information paper !A by combining an optical filter, a lens, and a charge-coupled device on the same optical axis. A clock generation section is provided for sending a clock signal obtained from a common oscillation source to the pulse motor and the charge-coupled device, and the optical filter of the photoelectric conversion section is provided with a plurality of types of optical filters having different amounts of transmitted light adjacent to each other. At the same time, the plurality of optical filters are switchably displayed and retracted on the optical axis by a filter switching mechanism, and a clock frequency is transmitted from the clock generation section after obtaining filter selection information from the filter switching mechanism. To provide an image information reading device characterized in that the pressure is switched to a frequency that provides a conveying speed of an image information sheet and an accumulation time of a charge-coupled device suitable for the amount of transmitted light of each optical filter. Ru.

Embodiments of the E0 Invention Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

An image information reading device, for example, an optical character reading device according to the present invention is comprised of a mechanism section, a control section, and a fiber section λ. As shown in FIG. 1, the mechanical section includes a hopper section 2 that sequentially feeds out l1iIib such as forms, a separator section 3 that separates the nine-gI information 11 that is fed out from the hopper section 2 into single sheets, and this An aligner s4 to be set on the separated ulii image information paper taking super heavy l, a reading unit 5 which reads the image information paper 1 set on the reading reference surface at a constant speed, and an image information paper 1 which has finished reading. It has a conveyance section 6.6' for conveying the image information paper 1 to a stacker section 7, T' to be described later, and a stacker section 717' for storing the conveyed image information paper 1.

As shown in FIG. 1, the upper Kiyoku MR Matsube 5 has a paper feeding section that runs the T-combined image information paper 1 at a constant speed with a pulse motor and a drive roller 9.9'. It has a light source unit that irradiates the image information paper 1 with reading light by combining a light source 10 such as a halogen lamp and a transparent plate 11, and also has a light source unit that irradiates the image information paper 1 with reading light, and a light source that is reflected from the image information paper 1 and changes the source in a predetermined direction. A mirror 12, an optical filter 13 that extracts only light of a desired wavelength, a lens 14 that forms a reduced image at an appropriate rate, and a charge-coupled device (COD).
) 15 on the same optical axis 1 @ to create the above image information paper 1
It has a photoelectric conversion section that photoelectrically converts the reflected light from.

The optical filter 1s of the photoelectric conversion section includes first optical filters 1 each having a different transmission wavelength, as shown in FIG.
3' and the second optical filter $13' in the holder 17[1
i11 is arranged. Here, as the irises optical filter 13', a red filter is used that provides the amount of transmitted light for which the charge-coupled device 15 has the highest sensitivity, and as the second optical filter 13', red characters, diagrams, or seals are used. A green filter, which is a complementary color to red, is used to view the images as black characters, line diagrams, etc.

A filter switching mechanism 10 is provided at the end of the holder 17011i. This filter switching mechanism IS is
It is connected to the base end of the holder 11 and consists of a nine solenoid II and filter changeover detection switches 2G' and 2G'. When the solenoid II is driven, the holder 11 slides in the direction of arrow B in a plane orthogonal to the original axis 1@, and the first optical filter 13 is placed on the original axis 16.
' or the second optical filter 13' can be made to appear or disappear by appropriately switching. At this time, the protrusion 22' or 2 of the holder 11 on which the contactor 21' or 21' of the filter changeover detection switch 20' or 20' slides? When pressed by the respective internal microswitches, the filter switching signal 81 is output from the lead 23' or 23'.
or 82 respectively. In addition, the above Lunoid 1s
Instead, the operator can switch manually.

The pulse motor and the charge-coupled device ISK are connected to a common clock generator 24, as shown in FIG. This clock generator 24 includes a reference clock circuit 2S.
, branch circuit 2G, and changeover switch 21, and this changeover switch 2T is connected to the filter changeover detection switch 20'.
Or the round switching signal s1. sent from 20'. In response to s2, it is switched and connected to contact II or 2I to switch between the reference crotter circuit 1s and the minute 11 circuit 2s, and the pulse motor
and the charge-coupled device 1s with respective drive circuits 30 or 3.
1 to send out a clock signal of the same frequency. The clock pulses of the reference clock circuit 25 are as shown in FIG.
As shown in )K, the clock pulse after this reference clock pulse passes through the branch circuit 2 is approximately three times as long as the period t, as shown in Figure 4-)K. t
, and its clock frequency is about one-third of the original
It is said that

Then, the changeover switch 21K of the clock generation section 24
, one filter changeover detection switch 20' shown in FIG.
When the switching signal 81 sent from the switch 81 is input, the scissors changeover switch 21 is connected to the contact 2 on the side K11, and the pulse motor 8 and the charge-coupled devices IS and K are connected to the fourth #A (reference clock shown in 11). When the signal 32 is sent out and the switching signal 82 sent from the other filter changeover detection switch 20' is input, the changeover switch 21 switches to the other contact 2S.
IIK connected to the above pulse motor a and charge coupled device 1
The clock signal 3s of the frequency dividing circuit shown in Fig. 4(b) is sent out. Since there is a difference in the amount of transmitted light of about 3 times between the red o first optical filter 13' and the green second optical filter 13', the transport speed of the good image information sheet 1 is adjusted accordingly. This is to provide an accumulation time for the charge-coupled device 15.

Next, the operation of the 5IIi great information reading device according to the present invention will be explained. First, if the picture book information paper IK does not contain red letters, scales, seals, etc., drive the filter switching mechanism 180 lnoid 1s shown in Diagram 2 and slide the holder IT in the direction of the arrow. 01g- optical filter 13' is set on the optical axis 1@. At this time, the protruding piece 22' on the base end of the holder 170 presses only the contact 21' of one filter changeover detection switch 20', and the 1st switch of the filter changeover detection switch 20' is activated. A filter switching signal 81 is sent out. This switching signal 81 is 3! As shown in FIG.
1 and connects the selector switch 1T to contact 28.

In this state IIIK, the pulse motor S and the charge-coupled device ISK are connected from the reference clock circuit 2i through the contact 20, the changeover switch 2T, and the respective drive circuits 30 or 31.
A reference clock signal 32 shown in FIG. 4 ((1)K) is input. By this reference clock signal 32, the pulse motor 8 and the charge-coupled device 1s operate synchronously. That is, the reference clock signal 32 shown in FIG. The image information paper 1 is conveyed at a cycle of t, and the charge-coupled device 1s is activated.

Next, if the image information sheet 1 contains red characters, diagrams, seals, etc., the solenoid 1- is driven to slide the holder IT in the direction of arrow B, as shown in FIG. and set the green second optical filter 13' on the optical axis 1@
set on top. At this time, the protruding piece 22' at the base end of the holder 17 presses only the contact 21' of the other filter changeover detection switch 21, and the microswitch of the filter changeover detection switch 20' is activated to switch the filter. A signal S2 is sent out. As shown in FIG. 3, this switching signal S2 is inputted to the changeover switch 2T of the clock generator 24 via the lead 23', and the changeover switch 2T is connected to another contact 291IIK. In this state, the branch circuit 26 is connected to the pulse signal generator and the charge coupled device 15 via the contact 21, the changeover switch 2T, and the respective drive 1 circuit 30 or 31t7 to the frequency divider circuit shown in FIG. 4 (b). A clock signal 33 is input. The clock signal 33 of this frequency dividing circuit causes the pulse motor Hatake and the charge coupled device 1 to
5ti operates in sync. Therefore, as shown in FIG. is activated. As a result, even when switching to the green second optical filter 13', the red first optical filter 13' remains unchanged.

By using 13', it is possible to obtain the same X-order video output as in the case of 9, and it is also possible to keep the pixel size constant.

F. Effects of the Invention Since the present invention is configured as described above, it is possible to switch the optical filter 13 of the photoelectric switch to multiple types with different transmission wavelengths, and it is also possible to switch the optical filter 13 of the photoelectric switch to a plurality of types having different transmission wavelengths. Output and pixel size can be kept constant. If a green filter is used as the second optical filter 13', the image information paper 1 will have red letters! All image information can be read and visualized even if it includes a seal or the like.

[Brief explanation of drawings]

Figure 111 is an explanatory diagram showing the structure of the information reading device according to the present invention, and Figure 2I11 is a diagram showing the reading section thereof.
figure,! Fig. s3 is an operational explanatory diagram with the light source section and reflecting mirror omitted, and Fig. 4 (II) and Fig. 4) are waveform diagrams showing the reference clock signal and the clock signal of the branch circuit, respectively. 1...-Image information paper S...Face removal portion $...Pulse screen ■, -'...Drive roller 10-...Light source 11...Transparent plate 12...Reflector 13...Optical filter 1s'...First optical filter 1s'...
...Second optical filter 14...Lens 15...Charge coupled device 1 @ -...Optical axis 11...Holder 11...-Filter switching mechanism 1s -... Lunoids 20', 20'... Filter switching detection switch 24... Clock generation section 2z... - Reference clock circuit 26... Branch circuit 2T ......Switch s2...Reference clock signal s3...Clock signals s1, s2 of the branch circuit
...Switching signal

Claims (1)

[Claims] It has a paper feeding unit that conveys the image information paper by combining a pulse motor and a drive roller, a light source unit that irradiates the m-ratio information paper with reading light, and an optical filter, a lens, and a charge-coupled device. - In an image information reading device comprising a photoelectric conversion unit that is combined on the original axis to perform full photoelectric conversion of reflected light from the image information paper, a clock is obtained from a common oscillation source for the pulse motor and the charge-coupled device. There are eight clock generators that send out signals, and the optical filters of the photoelectric converter are provided with multiple types of optical filters with different transmission wavelengths adjacent to each other, and these multiple types of optical filters are connected to the original axis using a filter switching mechanism. The clock frequency sound that is switchably appeared and appears on the top of the optical filter, and that receives filter selection information from the filter switching mechanism and is sent out from the clock generator, is adapted to the transmission wavelength of each optical filter, and is adapted to the conveyance speed of the good image information sheet and An image information reading device characterized in that the frequency is switched to a frequency that provides an accumulation time of a charge-coupled device.