JPH04226379A - Information recorder - Google Patents

Abstract

PURPOSE:To eliminate influences of recording solution or the like on a surface side of a recording medium by a method wherein a speed detecting means which detects a carrying speed state of the recording medium from a rear side of the recording medium, and a control means which controls a recording position based on the carrying speed information to be detected by the speed detecting means are provided. CONSTITUTION:A recording means 313 which records information in a recording medium 306 based on a recorded information data and a carrying means 301 which carries the recording medium 306 by opposing a surface side of the recording medium 306 to the recording means 313 are provided. A carrying speed state of the recording medium 306 is detected from a rear side of the recording medium 306 by a speed detecting means 300, and a recording position is controlled by a control means 311 based on carrying speed information to be detected by the speed detecting means 300.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for recording information such as characters and images by ejecting a recording liquid from, for example, a full-line recording head having the width of the recording medium onto a recording medium conveyed by a conveying means.

0002

2. Description of the Related Art Conventionally known inkjet recording devices of this type that record information such as characters and images by ejecting recording liquid from a recording head include serial type recording devices and full-line type recording devices. There is.

In the former serial type recording device, recording is performed by a recording head mounted on the carriage while the carriage is moved along a platen that holds the recording material, and the sheet is not fed in a direction perpendicular to the direction of carriage movement. The latter type of full-line recording device has a recording head equipped with ink ejection ports arranged over the recording width in the main scanning direction, and the recording head is connected to the recording material in the sub-scanning direction. Recording is performed while moving the camera relative to the camera.

[0004] Further, an apparatus has been proposed which is configured to perform not only monochrome recording but also color recording by arranging a plurality of recording heads while adopting the above-mentioned configuration.

FIG. 13 is a control configuration diagram illustrating the conveyance control mechanism of a conventional inkjet recording apparatus. Reference numeral 51 indicates a cut sheet serving as a recording medium, and after the registration roller 52 has set the writing timing in the sub-scanning direction. , transported in the direction of the arrow.

A paper press roller 53 controls the movement of the cut paper 51 placed on the conveyor belt 54. Reference numeral 55 denotes a drive roller around which the conveyor belt 54 is wound with a constant tension. 56 is a charger that charges the cut paper 5 on the conveyor belt 54.
1 is electrostatically attracted to the conveyor belt 54.

Reference numeral 57 denotes a paper discharge tray, on which cut sheets 51 on which recording processing has been completed are stacked and discharged. Reference numerals 58 to 61 represent image buffers for storing recording information data, in which color data corresponding to each color of yellow, magenta, cyan, and black for reproducing a color image is stored based on a write control signal from the control unit 62. . Note that the control unit 62 controls each image buffer 5 at predetermined intervals after the registration roller 52 is driven.
The color data of each color is read from 8 to 61, and the recording head 6
3 to 66, and each color image is recorded on the cut paper 51. Reference numerals 67 to 70 indicate memory control lines, which transfer write control signals from the control unit 62 to the respective image buffers 58 to 61. Data lines 71, 73, 75, and 77 transfer each color data read from each image buffer 58-61 to each recording head 63-66. Recording control lines 72, 74, 76, and 78 transfer recording timing signals output from the control section 62 to the recording heads 63 to 66.

Reference numeral 79 denotes a start signal, which is output from a host (not shown).

Next, the recording operation will be explained.

In the recording apparatus having a plurality of recording heads 63 to 66 as described above, when the cut paper 51 is fed after the image recording timing in the sub-scanning direction is set by the registration roller 52, the charger 56 As a result, the cut paper 51 is attracted to the conveyor belt 54 and conveyed. In parallel with this, when a start signal 79 outputs a recording operation start command to the control unit 62, the recording head 66, which becomes the first recording head, is instructed to start recording from the beginning of the cut sheet 51. Image data (color data) is read out from the image buffer 61 and printed on the cut paper 51 by the recording head 66.
Start recording.

Similarly, the timing for the second to fourth recording heads 65 to 63 corresponding to the distance from the previous head is set, and the image data read from the image buffers 60 to 58 for each color is Recording heads 65 to 63 for each color
As a result, a full-color image is formed and the paper is ejected to a paper ejection tray 57.

Now, the conveyor belt 54 that conveys the cut paper 51 serving as a recording medium has uneven thickness caused in the manufacturing process, uneven roundness of the drive roller 55, and fluctuations in the drive load, so that the cut paper 51 is not as smooth as shown in FIG. Periodic and non-periodic fluctuations occur in the conveyance speed.

FIG. 14 is a characteristic diagram illustrating the speed unevenness characteristics of the conveyor belt 54, where the vertical axis shows the belt speed and the horizontal axis shows time.

In this figure, I indicates the velocity curve and T
indicates the period of one revolution of the belt, and H indicates the maximum speed fluctuation amount.

As can be seen from this figure, the thickness of the conveyor belt 54 may be uneven due to the uneven thickness of the conveyor belt 54 that occurs during the manufacturing process, the roundness of the drive roller 55 may be uneven, or the drive load may fluctuate.
The speed shifts to the plus side (acceleration) and minus side (deceleration) from the normal reference conveyance speed V0. As a result,
After the cut paper 51 is conveyed from the registration roller 52, the time it takes to arrive between each of the recording heads 66 to 63 varies, and the writing timing of each recording head 66 to 63 is slightly shifted, resulting in uneven density of the image and deviations in registration. occurs.

Particularly in the case of color images, there is a serious problem in that even if a very small color shift occurs, color bleeding occurs, which significantly reduces the quality of the color image.

[0017] In order to solve this problem, September 17, 1988
Japanese Patent Application No. Sho 63-231469 filed on 1983-1999 discloses a device that detects the conveying speed state of a conveying means for conveying a recording medium and adjusts the recording timing of the recording means based on the detected conveying speed state. be done.

[0018] Also, JP-A-2-262064 (90.10
．． 24 Publication) discloses a non-contact Doppler velocimeter that is compact as a speed detection means and does not cause measurement errors due to wavelength fluctuations of a light source, and adjusts the recording timing of a recording means based on the detected conveyance speed state. Disclose that.

A speedometer similar to the above-mentioned non-contact Doppler speedometer is disclosed in US Pat. No. 4,948,257.

[0020]

However, in the conventional example described above, it is conceivable that the recording medium may be affected by the recording liquid on the surface side of the recording medium.

Furthermore, when cut paper is used as a recording medium, detection errors may occur at the edge step portions at the leading and trailing ends of the cut paper.

[0022] An object of the present invention is to provide a more improved information recording device.

[0023]

[Means for Solving the Problems] In order to achieve the above object, the present invention includes a recording means for recording information on a recording medium based on recorded information data, and a recording means for recording information on a recording medium based on recording information data, and a recording means for recording information on a recording medium with the surface side of the recording medium facing the recording means. A conveyance means for conveying the recording medium, a speed detection means for detecting the conveyance speed state of the recording medium on the back side of the recording medium, and a recording position is adjusted based on the conveyance speed information detected by the speed detection means. The invention is characterized by comprising a control means for controlling.

[0024]

[Function] For example, on the back side of the belt 301 that conveys paper 306 as a recording medium, the silver halide film 3 as a recording medium.
Irradiate the back side of 36 with light to obtain a Doppler velocity signal,
From this, the recording position is adjusted by adjusting the recording timing and keeping the conveyance speed constant.

[0025]

[Examples] Examples of the present invention will be described below.

An embodiment will be described in which the recording position is made constant by recording timing control in FIG. 1, and the recording position is made constant by conveyance speed constant control in FIGS. 2 and 3.

In FIG. 1, a speed meter 300 provided on the back side of a belt 301 serving as a conveying means is used to control the recording timing of the recording head 313.

301 is a belt on which the recording paper 306 is placed; 302 is a paper feed unit that supplies the paper 306 onto the belt 301; 303 and 304 are rollers;
304 is a belt roller pivotally supported by the main body, 304 is a drive roller, and 305 is a drive motor to which the drive roller 304 is attached.

The belt 301 is stretched between a drive roller 304 and a belt roller 303 as shown, and is connected to a drive motor 305 via a drive motor driver 312.
By rotating the drive roller 304 in the direction of the arrow, the belt 301 is moved.

[0030] Paper 30 supplied from paper feeding unit 302
6 is placed on the belt 301 and moves in the direction of the arrow as the belt 301 moves. The speedometer 300 irradiates the back side of the moving belt 301 with a laser beam to detect the speed of the belt 301.
The reflected and scattered light from the irradiation position 01 is received by a photodetector.

The output signal from the photodetector of the speedometer 300 is input to the speed detection circuit 310. Circuit 310 detects the moving speed of belt 301 based on the frequency of the output signal from the photodetector. The speed information detected by the circuit 310 is input to the control circuit 311.
1 is a recording head 313 for recording an image on paper 306;
control the recording timing.

For example, if the transport speed is the normal reference transport speed V
If it is recognized that the value exceeds 0, the recording head 313
The image recording timing of the recording head 313 is advanced, and when it is recognized that the conveyance speed is smaller than the normal reference conveyance speed V0, the image recording timing of the recording head 313 is delayed. By controlling the recording timing by this control circuit 311, the dot pattern in the sub-scanning direction also has a constant pitch, and the paper 3
06, an extremely good image can be recorded.

Next, FIG. 2 is a diagram of an embodiment in which the printing position is made constant by controlling the conveyance speed to be made constant. Note that the same symbols as in FIG. 1 indicate the same members.

In FIG. 2, speed information detected by circuit 310 is input to control circuit 311, and circuit 311 controls the rotational speed of drive motor 305 via drive motor driver 312. This control is performed by the circuit 3 so that the moving speed of the belt 301, that is, the moving speed of the paper 306 is constant.
11 inputs a correction signal to the driver 312, and in response to this signal, the driver 312 adjusts the rotational speed of the drive motor 318.

[0035] As a result, the feeding speed of the paper 306 becomes almost constant, and periodic speed changes of the belt 301 due to eccentricity of the drive roller, which conventionally occurred when only the rotation speed of the drive roller was controlled, are eliminated. Can be canceled and paper can be fed more reliably at a constant speed.

If the speedometer 300 described later is used, it is very compact and has a small number of parts, so the cost is low, so it can be effectively used in image recording equipment such as facsimiles.

In FIG. 2, an image is written on a paper 106 that is fed at a constant speed by a print head (not shown). In this embodiment, since the image is written while the paper 306 is being moved extremely accurately (movement in the sub-scanning direction during image writing), high-quality printing is possible.

Here, as shown in FIG. 3, a silver halide film may be provided in place of the paper 106, laser scanning recording may be performed on the front surface (emulsion surface) of the film, and speed detection may be performed on the back surface of the film. This eliminates the problem that when the speed of the film surface is optically detected, the film emulsion surface on which information is to be recorded is exposed to light for speed detection.

That is, with reference to FIG. 3, an embodiment of a medical laser printer, which is often used in the medical field and records and outputs high-definition, multi-gradation monochrome halftone images on film, will be described.

In FIG. 3, 321 is a semiconductor laser;
22 represents an optical system such as a collimator lens, which converts the light from the semiconductor laser 321 into parallel light. 323 is a beam splitter 324 is a condensing lens, and 325 is a photodiode, which monitors the intensity of the laser beam split by the beam splitter 323. A control circuit 326 controls the entire device, and performs modulation driving of the semiconductor laser, sub-scanning control, and the like. As a modulation method for a semiconductor laser, modulation is performed based on a pixel density signal by pulse width modulation, intensity modulation, or the method described in Japanese Patent Application No. 1-243771.

On the other hand, in the transmission direction of the beam splitter 323, a lens 330 and a rotating polygon mirror 331 serving as deflection means for performing main scanning are arranged. 332 is an fθ lens for tilt correction, and 333 is a folding mirror that directs the direction of the light beam to the film 3 that is the recording medium.
36 surface (emulsion side). 337 is a supply magazine that stores a large number of unused films, and 334 is a receive magazine that stores photosensitive recorded films. The film is stored with the emulsion side facing up. 335 is a motor for performing sub-scanning, and its rotational speed is controlled by a command from a control circuit 326. A roller 328 is connected to the motor 335 and is used to perform sub-scanning of the film 336. 327 is a Doppler velocimeter placed on the back side of the film, and the back side of the film 336 (
The transport speed of the film 336 is measured in a non-contact manner by applying a laser beam to the non-emulsion surface and detecting scattered light that has undergone Doppler shift. Since the non-emulsion surface is irradiated with laser light, the speed can be detected without exposing the film to light. The output of Doppler velocimeter 327 is connected to control circuit 326. The film 336 is taken out from the supply magazine 337 by an unillustrated take-out mechanism and sent to a roller 328, where the roller 328 sub-scans the film 336 at a low speed. At this time, the control circuit 326 monitors the output of the Doppler speed meter 327 and controls the rotational speed of the motor 335 so that the output is constant. By forming such a feedback loop, highly accurate sub-scanning can be performed. Since the sub-scanning speed of the film is directly detected by the Doppler velocimeter, even if the roller 328 is installed eccentrically, or if the roller 328 itself is not well rounded, it will not be affected by the eccentricity of the roller 328 and will not be affected by the eccentricity of the roller 328. Sub-scanning can be achieved. Rotating polygon mirror 33 simultaneously with sub-scanning
Main scanning is performed by one rotation, and a latent image is two-dimensionally exposed and recorded on the film 336 with a modulated laser beam. The medical laser printer of this embodiment generally outputs medical diagnostic images in a predetermined array in multiple formats. The recorded film is stored in the receive magazine 334. Further, although not shown in the figure, a developing device is provided to automatically develop the recorded film, and the recorded film can be selectively sent to either the receive magazine 334 or the developing device. It is now possible to do so. 329 is a signal (
This is a photodetector for obtaining a BD signal. The control circuit 326 modulates and drives the semiconductor laser 321 in accordance with the pixel signal to be recorded while being synchronized with the output of the photodiode 329. Since the timing at which to start drawing each scanning line is obtained based on the BD signal, it is necessary to obtain the timing as accurately as possible for the BD signal in order to draw a highly accurate image. Therefore, when the scanning light beam passes through the photodetector 329 and detects the signal, the semiconductor laser 3
21 is configured to continuously oscillate with a constant output.

Note that the speedometer 300 in FIGS. 1 to 3 may be of any non-contact type, and for example, a well-known laser Doppler speedmeter may be used. Note that it will be more suitable if a new type of laser Doppler velocimeter, which will be described later, is used.

FIG. 4 is a diagram of an embodiment of an inkjet recording apparatus capable of color recording, and the same members as in FIG. 13 are given the same reference numerals. In FIG. 4, reference numeral 1 denotes a laser Doppler speed detector, which uses a semiconductor laser as a light source and is miniaturized. The speed detector 1 is provided on the upstream side of the drive roller 55, on the inner circumferential side of the conveyor belt 54, at approximately the center in the width direction of the conveyor belt 54. 2 is a control unit which also serves as recording timing adjustment means, and when the speed detector 1 detects the conveyance speed of the conveyor belt 54 serving as a conveyance means, the moving distance of the conveyor belt 54 is calculated from the output as described later. The image writing timing of the recording heads 63 to 66 is created, and the registration of each color image is made consistent so that regular image writing can be performed without depending on the speed unevenness of the conveyor belt 54, and there is no density, color unevenness, or color bleeding. form an image.

5 and 6 show the recording head 6 shown in FIG.
3 to 66 are cross-sectional views illustrating the configurations of numerals 3 to 66, and diagrams illustrating the principle of ink ejection thereof, and show, for example, the case of a bubble jet type recording head.

In these figures, reference numeral 11 denotes a head main body, which applies heat to the recording ink 12 according to electrical energy input from a heating element 13. 14 is a bubble.

When heat corresponding to the electrical energy input from the heating element 13 is applied to the recording ink 12,
Air bubbles 14 are generated at the ejection port 15, and the air bubbles 14 cause ink droplets 17 to be ejected from the ejection port 16 onto the surface of the recording medium.

In this embodiment, based on the printing resolution, for example 400 DPI, the head bodies 11 are arranged in a line so as to form a full line in the width direction of A4 paper, and 3360 dots are printed in the main scanning direction. is possible.

Next, referring to FIGS. 7 and 8, FIG.
The write start timing adjustment processing operation for each of the recording heads 63 to 66 shown in FIG.

FIG. 7 is a driving circuit diagram of the bubble jet recording head consisting of the head body 11 shown in FIG.
Reference numerals 3-1 to 13-N are heating elements, each of which corresponds to 3360 dots, one end of which is connected to the heater power source HV, and the other end of which is connected to the collector side of the switching transistors TR1 to TRN. Switching transistor TR1
The outputs of AND gates G1 to GN are input to the base side of ~TRN. The AND gates G1 to GN take the AND of the heat pulse HP and the latch outputs of the latch circuits 22-1 to 22-N, and turn on/off the switching transistors TR1 to TRN based on the AND output.

21-1 to 21-N are shift registers,
The data D for one line, that is, 3360 dots, stored in each image buffer 58 to 61 is transferred to the data clock D.
The data is transferred sequentially in synchronization with CLK. Note that the latch circuits 22-1 to 22-N transfer data D transferred to the shift registers 21-1 to 21-N in synchronization with the latch pulse LP.
latch up. FIG. 8 is a timing chart explaining the operation of FIG. 6, and the same parts as in FIG. 6 are given the same reference numerals.

When data D is read out from the image buffer 61 in response to a start signal 79 generated from the control unit 2 via the memory control line 70, this data D is incorporated into the recording head 66 via the data line 77. The data D is input to shift registers (for example, LS164) 21-1 to 21-N, and data D for one scan, that is, 3360 dots, is sequentially transferred. When the data D for one scan is transferred, a latch pulse LP is inputted from the control unit 2 via the recording control line 78, and the latch circuit (for example, LS374) 22-1 similarly incorporated in the recording head 66 ~22
-Latched to N.

The control section 2 counts the output of the speed detector 1 to generate a heat pulse clock, and inputs the heat pulse HP to the recording head 66 via the recording control line 78 at that timing.

As a result, the AND gates G1 to GN built into the recording head 66 operate, and the AND output turns on the switching transistors TR1 to TRN at the subsequent stage.
Heating element 13-1 of the dot to be turned on/off and printed
13-N is selectively energized to execute image recording.

FIG. 9 is a block diagram illustrating the output timing of the heat pulse HP shown in FIG. 8.

In the figure, a timing counter 31 counts the number N of pulses output from the speed detector 1 as a frequency f proportional to the speed v in order to detect the moving distance.

A fixed value output section 32 outputs the number of pulses PA (fixed value) per line to the input port A of the comparator 33. The comparator 33 outputs a heat pulse clock when the number of pulses PA input to the input port A and the count value PB counted up from the timing counter 31 match. The heat pulse HP shown in FIG. 8 is created using this heat pulse clock. The inverter 34 is activated by the heat pulse clock to clear the contents of the timing counter 31.

[0057] This makes it possible to output a heat pulse HP every time the conveyor belt 54 moves by one line even if there is a speed fluctuation in the conveyor belt 54.

FIG. 10 shows one of the more suitable optical non-contact speed detectors 1 used in the information recording apparatus according to the present invention.
FIG. 2 is an explanatory diagram of a small laser Doppler velocity detector using a semiconductor laser 101 in an example.

Laser light oscillated by the semiconductor laser 101 becomes parallel light 104 by the collimator lens 102 and enters the diffraction grating 105 perpendicularly, and becomes ±1st-order diffracted light 106.
. At this time, each incident angle of the conveyor belt 54 is equal to the diffraction angle θ by the diffraction grating 105, and sin θ=±λ/d (1). However, d is the grating pitch (constant) of the diffraction grating 105
, and λ is the wavelength of the laser beam. Here condition (1)
As is clearer, the angle of incidence θ on the conveyor belt changes as the wavelength λ of the light from the light source changes, and sin θ/λ remains constant. Doppler-shifted scattered light from the two-cross-irradiated portion of the conveyor belt 54 is focused onto a light receiver 109 by a condenser lens 108 . The output of the light receiver 109 has a speed V of the conveyor belt 54, which is a so-called Doppler frequency.
contains a frequency component fD proportional to , fD=2V
It can be expressed as sinθ/λ...(2), but due to the diffraction condition (1) above, f
D=2V/d (3), and laser Doppler speed detection that is independent of the laser wavelength λ and proportional to the speed V of the conveyor belt 54 is possible.

FIG. 11 shows a modification of FIG. 10 in which a semiconductor laser 101 is arranged in a direction perpendicular to the plane of FIG. 10 via a mirror M.

In FIG. 12, instead of mirrors 107 and 107', diffraction gratings 110 and 110' having a grating pitch of 1/2 of that of diffraction grating 105 are arranged parallel to diffraction grating 105.
Since the first-order diffracted light toward the center of the optical system is used, the incident angle of the diffraction gratings 110 and 110' is equal to the diffraction angle, and fD=2V/d is obtained as in FIG. 10. As the diffraction gratings 110 and 110', for example, blazed diffraction gratings are desirable, in which most of the diffracted light energy is concentrated in a specific order (in this case, the first-order diffraction toward the center of the optical system).

As shown in FIGS. 10, 11, and 12, a laser Doppler velocity detector configured to split the beam into two beams using a diffraction grating and enter the conveyor belt at the same angle as the diffraction angle uses a semiconductor laser. In addition, since it can be configured with a diffraction grating and a simple optical system, it can be made compact, and the speed of the conveyor belt can be accurately output as a frequency.

As a result, it is possible to stably and accurately record an image without affecting the conveyance of the recording medium, and without being affected by dirt on the surface of the conveyance means due to recording liquid, etc., and to record an image without uneven density. Especially the misregistration,
It is possible to record color images without color unevenness or color bleeding.

[0064] In the above embodiment, an information recording apparatus that discharges recording liquid has been described, but the present invention is not limited to this, and may be an information recording apparatus that performs optical recording using a laser or the like.

In addition, a plurality of speed detectors may be provided in the width direction of the recording medium, or they may be displaced in this direction, or a diffraction grating may be moved in the transport direction of the recording medium to detect so-called dropout (dropout) when the transport speed becomes low. (no signal) may be prevented.

Further, a plurality of speed detectors may be provided in the conveying direction of the recording medium.

Further, the speed detector may be movable in a direction perpendicular to the recording surface of the recording medium to change the irradiation condition on the recording surface.

Now, in the embodiment described above, the diffraction grating is ±1
Although it is designed to emit second-order diffracted light, ±nth-order light (n is a natural number) may also be used. Furthermore, two light beams having different orders, for example, 0th order light and nth order light may be used. Alternatively, a reference light method may be used in which a moving object is irradiated with one of the two light beams, and the other light beam that is not irradiated with the moving object is caused to interfere with the scattered light from the moving object to obtain a Doppler signal.

Furthermore, if the laser Doppler velocimeters described above are arranged orthogonally, two-dimensional velocity detection becomes possible.

Furthermore, in the embodiments of FIGS. 4 and 9, the timing counter 31 counts the number of pulses N outputted as a frequency proportional to the speed based on the output of the speed detector 1, calculates the moving distance, and the comparator 33 Heat pulse H when the number of pulses PA input to input port A of
I mentioned that the recording timing is adjusted by outputting P, but if there are two or more recording densities and it is possible to select one of them,
When selecting a high recording density, adjust the recording timing by adjusting the number of input pulses P to shorten the moving distance.
Set A to a small value.

The present invention provides excellent effects particularly in bubble jet recording heads and recording apparatuses among ink jet recording systems.

For its typical configuration and principle, see, for example, US Pat. Nos. 4,723,129 and 4,740.
Preferably, it is carried out using the basic principles disclosed in the '796 specification. This method can be applied to both the so-called on-demand type and continuous type, but
In particular, in the case of the on-demand type, the electrothermal transducer placed corresponding to the sheet holding the liquid (ink) or the liquid path is required to respond to the recorded information and rapidly exceed nucleate boiling. By applying at least one drive signal that causes a temperature increase, the electrothermal transducer generates thermal energy that causes the thermally active surface of the recording head to boil, resulting in a liquid in one-to-one correspondence with this drive signal. This is effective because it can form air bubbles within the (ink). The growth and contraction of the bubble causes liquid (ink) to be ejected through the ejection opening to form at least one drop. It is more preferable to use this drive signal in a pulse form because the growth and contraction of the bubbles can be carried out immediately and appropriately, so that liquid (ink) ejection with particularly excellent responsiveness can be achieved. This pulse-shaped drive signal is described in U.S. Pat. Nos. 4,463,359 and 434.
5262 is suitable. Further, if the conditions described in US Pat. No. 4,313,124 concerning the temperature increase rate of the heat acting surface are adopted, even more excellent recording can be achieved.

[0073] In addition to the configuration of the recording head that combines ejection ports, liquid paths, and electrothermal converters (straight liquid flow path or right-angled liquid flow path) as disclosed in the above-mentioned specifications, U.S. Pat. No. 4,558,333 and U.S. Pat. No. 4 disclose a configuration in which a heat acting part is arranged in a bending region.
A configuration using the specification of No. 459600 is also included in the present invention. In addition, Japanese Patent Application Laid-Open No. 123670 of 1982 discloses a configuration in which a common slit is used as a discharge part of a plurality of electrothermal converters, and a hole that absorbs pressure waves of thermal energy is disclosed. The present invention is also effective as a configuration based on Japanese Patent Application Laid-Open No. 138461 of 1981, which discloses a configuration in which a discharge portion corresponds to a discharge portion.

Furthermore, a full-line type recording head having a length corresponding to the width of the maximum recording medium that can be recorded by the recording apparatus can be produced by combining a plurality of recording heads as disclosed in the above-mentioned specification. Either a configuration that satisfies the length or a configuration as a single recording head formed integrally may be used, but the present invention can more effectively exhibit the above-mentioned effects.

In addition, a replaceable chip-type recording head that is attached to the apparatus main body enables electrical connection with the apparatus main body and ink supply from the apparatus main body, or a print head that is integrated into the print head itself. The present invention is also effective when a cartridge type recording head is used.

Further, it is preferable to add recovery means, preliminary auxiliary means, etc. for the recording head, which are provided as a configuration of the recording apparatus of the present invention, because the effects of the present invention can be further stabilized. Specifically, these include capping means, cleaning means, pressure or suction means, preheating means for the recording head using an electrothermal transducer or another heating element, or a combination thereof. It is also effective to perform a preliminary ejection mode in which ejection is performed separately from printing in order to perform stable printing.

Furthermore, the recording mode of the recording apparatus is not limited to a recording mode of only mainstream colors such as black, but may also include recording heads that are integrally configured or a combination of a plurality of recording heads, or multiple colors of different colors or The present invention is also extremely effective for devices equipped with at least one of the following: , full color by color mixing.

In the embodiments of the present invention described above, liquid ink is used, but the present invention can be applied to ink that is solid at room temperature or ink that is soft at room temperature. Can be used. In the above-mentioned inkjet devices, the temperature of the ink itself is generally adjusted within the range of 30°C to 70°C to keep the viscosity of the ink within a stable ejection range. It is sufficient if the ink is liquid. In addition, the temperature rise caused by thermal energy can be actively prevented by using the energy to change the state of the ink from a solid state to a liquid state, or an ink that solidifies when left standing is used to prevent ink evaporation. Iruka,
In any case, the property of liquefying only by thermal energy, such as ink that is liquefied by application of thermal energy in accordance with a recording signal and ejected as liquid ink, or that has already begun to solidify by the time it reaches the recording medium. The use of ink is also applicable to the present invention. In such a case, the ink is held in a liquid or solid state in the recesses or through holes of the porous sheet, as described in JP-A-54-56847 or JP-A-60-71260. It may also be in a form that faces the electrothermal converter. In the present invention, the most effective method for each of the above-mentioned inks is to implement the above-mentioned film boiling method.

[0079]

As described above, in the present invention, the speed detector is provided on the back side of the recording medium, and the speed can be detected without being affected by the stains caused by the recording liquid on the front side of the recording medium. There is no possibility of detection errors occurring at the edge step portions at the leading and trailing ends.

[Brief explanation of the drawing]

FIG. 1 is a diagram of an embodiment of recording position stabilization in recording timing control.

FIG. 2 is a diagram illustrating an example of stabilizing the recording position by controlling the conveyance speed of the belt to be constant.

FIG. 3 is a diagram of an example of stabilizing the recording position by controlling the conveyance speed of the silver halide film to be constant.

FIG. 4 is a diagram of an embodiment of an inkjet recording apparatus capable of color recording.

FIG. 5 is a cross-sectional view illustrating the configuration of the recording head shown in FIG. 4;

FIG. 6 is an explanatory diagram of the principle of ink discharge.

7 is a drive circuit diagram of a bubble jet recording head made up of the head main body shown in FIG. 5. FIG.

FIG. 8 is a timing chart illustrating the operation of FIG. 7;

FIG. 9 is a block diagram illustrating the output timing of heat pulses.

FIG. 10 is an explanatory diagram of a specific example of a speed detector.

FIG. 11 is an explanatory diagram of a specific example of a speed detector.

FIG. 12 is an explanatory diagram of a specific example of a speed detector.

FIG. 13 is a control configuration diagram illustrating a conveyance control mechanism of a conventional recording apparatus.

FIG. 14 is a characteristic diagram illustrating speed unevenness characteristics of a conveyor belt.

Claims (13)

[Claims] 1. Recording means for recording information on a recording medium based on recording information data; and conveying means for conveying the recording medium with the front side of the recording medium facing the recording means.
The recording medium is characterized by having a speed detection means for detecting the conveyance speed state of the recording medium, which is located on the back side of the recording medium, and a control means for adjusting the recording position based on the conveyance speed information detected by the speed detection means. Information recording device. 2. The information recording apparatus according to claim 1, wherein said control means adjusts recording timing of said recording means. 3. The information recording apparatus according to claim 1, wherein the control means adjusts the recording position by keeping the conveyance speed of the recording medium constant. 4. The control means includes a calculation means for calculating movement distance information by counting the number of pulses outputted as a frequency proportional to the speed based on the output of the speed detection means, and the calculation means calculates movement distance information. 3. The information recording apparatus according to claim 2, wherein the recording timing of the recording means is adjusted when the number of pulses obtained reaches a predetermined number of pulses. 5. The information recording device according to claim 1, wherein said speed detection means is an optical Doppler velocimeter. 6. The speed detection means sequentially detects a light source, a diffraction grating, and ±n-order light (
n is an integer) onto the conveying means, an optical system that changes the incident angle θ of the light onto the conveying means according to the wavelength λ of the light from the light source and keeping sin θ/λ substantially constant; and Doppler from a position where the speed of the conveying means is detected. The information recording device according to claim 5, further comprising a photodetector that detects the shifted scattered light. 7. The conveying means places the recording medium on the outer circumferential side of a thick endless carrier and rotates the endless carrier, and the speed detecting means is placed at a predetermined position on the inner circumferential side of the endless carrier. The information recording device according to claim 1, which is provided facing each other. 8. A plurality of recording densities can be selected, and the control means selects a small set number of pulses so as to shorten the moving distance for adjusting the recording timing when selecting a high recording density. information recording device. 9. The information recording apparatus according to claim 1, wherein the recording means records by irradiating light across the conveyance direction of the recording medium. 10. Information recording according to claim 9, wherein the recording medium is a silver salt film, and the speed detecting means detects the transport speed state by irradiating light onto a non-emulsion surface, which is the back surface of the silver salt film. Device. 11. The information recording apparatus according to claim 1, wherein the recording means performs recording by discharging liquid using the heating element, and wherein the control means controls the timing of liquid discharge from the recording means. 12. The recording means includes a plurality of recording heads corresponding to each color in the conveyance direction of the conveyance means, each recording head ejects liquid by a respective heating element, and the control means controls the liquid of each recording head. 2. The information recording apparatus according to claim 1, wherein the timing of ejection is controlled. 13. The information recording device according to claim 6, wherein the light source is a semiconductor laser.