JPS5850337B2 - printer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a printer that uses a magneto-optical element to convert time-series electrical signal input information into a hard copy.

More specifically, it is composed of a magneto-optical element made of a magnetic material for generating magnetic bubbles, an optical system for reading out information written therein as a bubble array image, and a recording medium for visualizing the bubble array image.

As a medium for visualization, for example, a selenium drum, a silver salt film, and a tube of photographic paper are used in xerography.

Currently, simple copying machines include xerographic copying machines, diazo copying machines, and electrofax machines.

Among them, the most common xerographic type is composed of main parts such as a selenium drum, a corona charger, a writing optical system, a cascade developer, and a fixing roll.

Since this conventional xerography apparatus uses a light input mode for illuminating the original, it has the disadvantage that it cannot directly copy the information of a time-series signal such as a facsimile signal onto recording paper.

There are inkjet printers, thermal printers, electrolytic printers, etc. for recording information in the form of time-series signals, such as facsimile printers, but they are all slow and many are single-function machines that cannot be used for other purposes. Furthermore, there are many disadvantages such as the need for treated recording paper.

A promising solution to these problems is a printer that uses magnetic bubble devices as photoelectric conversion elements.

FIG. 1 shows a known example of a line printer consisting of a magnetic bubble element 1, a recording medium 2, an imaging lens 3, a reading light source 4, an illumination adjustment lens 5, a magnetic field generating coil 6, a polarizer 7, and an analyzer 8. It is.

Further, FIGS. 2 and 3 are enlarged views of the magnetic bubble element 1 and the magnetic field generating coil 6 of a conventional line printer, respectively, where 9 is a magnetic material for generating magnetic bubbles, and 10
is a transfer channel, 11 is a bubble generator, 12 is a character generator, 13 is a bias coil, 14 is a modulation coil, 15
is the cancellation coil.

The magnetic bubble element 1 consists of a set of nine transparent transfer channels 10 and nine bubble generators 11 coupled thereto.

Bubble generator 11 operates under the control of character generator 12.

Character generator 12 generates the sequence of pulses required to form a dot matrix of the desired character corresponding to the encoded input signal.

Bubbles representing letters are created one row at a time and are transferred along each transparent channel 10 (from left to right in FIG. 2) by bias modulation.

As a result, the transferred magnetic bubbles create a state in which, for example, dots are arranged in a pattern as shown in FIG. 2, for example.

Such a magnetic bubble pattern can be used, for example, in the IEEE
Transactions on Magnetics
, 1974, MAG-10, No. 3, No. 575~
It is disclosed on page 580 and is publicly known.

This bubble array image can be read out as a bright and dark optical image using a pulsed cesium flash lamp or the like by installing a polarizer 7 and an analyzer 8 in front and behind the element, respectively.

Therefore, by forming this optical image on, for example, an electrophotographic photoreceptor, it can be easily converted into a hard copy using a known method.

A batch erasing method using the erasing coil 15 can be used to erase the bubble image.

Using the magnetic bubble device described above, 100K
)lz bubble transfer rate and pulse exposure of 100 μsec, it is possible to operate 400 lines in 1 sec.

However, this conventional method requires a high-brightness light source because it is a short-time exposure method in which a static image of the magnetic bubble array is once created and then imaged onto the photosensitive material using 100 μsec pulse exposure. .

At the same time, an optical chopper or the like was naturally required to pulse the readout light.

An object of the present invention is to provide a printer that visualizes time-series signal information at high speed.

Another object of the present invention is to enable the use of a light source with lower luminance than the conventional readout light source for stationary magnetic bubble images.

The present invention uses a magnetic bubble element and a developing material (photosensitive material), aligns the transfer direction of the magnetic bubble with the moving force direction of the developing material (photosensitive material), and makes both the same speed for 1:1 copying. This invention relates to a printer that operates synchronously.

FIG. 4 shows a schematic diagram of the printer of the present invention when a selenium drum is used as the developing material (photosensitive material), and FIG. 5 shows an enlarged view of the magnetic bubble element used as the photoelectric conversion element.

The printer of the present invention includes a magnetic bubble element 21. Imaging lens 3, readout light source 4, illumination adjustment lens 5, magnetic field generation coil 6
and a selenium drum 17 of the xerography device, and the magnetic bubble element 21 is composed of a magnetic material 9 for generating magnetic bubbles.
Bubble generator 11. It consists of a large number of transparent transfer channels 10 and bubble eliminators 18 arranged as one unit.

The transfer direction A of the magnetic bubble, the rotation direction B of the selenium drum, and their moving speeds are such that when both move, the image of a specific magnetic bubble is at a specific position on the selenium drum 17, that is, the moving speeds of both are synchronized. must be chosen to do so.

Figure 6 is a schematic diagram of the operation of bias-modulated bubble transfer using an angelfish pattern. By applying the modulated magnetic field shown in Figure 7, one pitch of the pattern is transferred from the initial state a to b-c in one cycle. Go forward only.

Therefore, the transfer speed is determined by the frequency of the transfer pulse, so for example, one angelfish pitch is 50μm.
In this case, if you want the bubble moving speed to be 30□□□xm/sec, you can modulate the bias magnetic field at 6 kHz.

In a xerography device, a document on a platen is exposed onto a selenium drum over a certain width, and this exposure width is adjusted by a slit just before the drum.

Generally, the narrower the slit width, the better the copy quality, but the shorter the exposure time.

Therefore, the document is written using band scanning rather than line width scanning.

For example, in the case of a xerography device with a drum speed of 300 mm/SeC and a slit width of 5 mm, information is input to one point on the photosensitive material for 15 m5ec for one point on the document.

As is clear from the foregoing description, the present invention uses a magnetic bubble element to create a writing configuration similar to that in xerographic devices and to reduce the load on the readout light source.

A simple comparison on the selenium drum shows that the conventional 100μ
There is a 150 times difference in exposure time between the sec pulse exposure and the 15 m5 ec continuous exposure of the present invention, which simply means that a light source with a lower brightness can be used.

In reality, the copy speeds are different, so a simple comparison cannot be made, but there is no doubt that the power of continuous exposure is advantageous.

Drum speed 300 mm/sec, slit width 5
mrL.

Effective size of magnetic bubble element: 10mm x 210++v
t, readout light attenuation due to element transmission 1/20, selenium sensitivity 1.
At 25 x 10-7 J/ctrt, 5 mW of He-N is required to enable readout with strip exposure of 10 x 210 mm.
The brightness of the e-laser is sufficient.

A specific example of the device implemented by the present inventors is as follows.

The magnetic material 9 for magnetic bubble elements of the present invention includes 501
Although a small-sized Gd orthoferrite single-crystal thin plate measuring 8 m x 8 m x 0.05 m was used, it will be possible to construct devices with larger dimensions in the future as crystal production technology improves.

The channel for bubble transfer provided above was a transparent transfer channel (C1 ear Vi
ewPropagation Channel) was used.

The transfer channel pattern in this case was shown in FIG. 8, and the pattern pitch was 70μ.

A bubble generator 11 and an eraser 18 were provided before and after each channel, and the bubble generator 11 was connected to a pulse generator corresponding to the input signal.

The magnetic field generating coil 6 was composed of a bias coil that generates a uniform magnetic field of 16 oersted, and a modulation coil that generates a uniform magnetic field of 16 oersted alternately from 0 to -3 oersted.

With this configuration, the magnetic bubbles generated by the bubble generator 11 moved within the transfer channel 10 at a speed of 280 mi/sec, reached the bubble eraser 18, and disappeared.

In the above example, a selenium drum was used as the photoreceptor, but it is clear that a suitable material such as a silver salt film, diazo film, or photographic paper may be used instead.

Furthermore, although the illustrated embodiment uses a light image transmitted through a magnetic bubble pattern, this can be carried out in exactly the same way using a light image obtained by reflection.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of a printer using a known magnetic bubble element, Fig. 2 is an enlarged view of the magnetic bubble element used in Fig. 1, and Fig. 3 is a schematic side view showing the arrangement of magnetic field generating coils.
FIG. 4 is a schematic configuration diagram of the band scanning printer of the present invention, and FIG.
The figure shows the magnetic bubble element used in the present invention, Figure 6 is an explanatory diagram of bubble movement on a transfer channel using an angelfish pattern, and Figure 7 is a diagram of the modulated magnetic field for this purpose.
FIG. 8 is a diagram showing an example of a transfer pattern. 6... Coil for magnetic field generation, 10... Transfer channel, 11... Bubble generator, 12...
...Character generator, 17...Selenium drum, 18...Bubble eraser, 21...Magnetic bubble element.

Claims (1)

[Scope of Claims] 1. A magnetic bubble formed by disposing a bubble generator, a transparent transfer channel extending from the bubble generator, and a bubble eraser provided at the end of the transparent transfer channel in a magnetic material for generating magnetic bubbles. a character generator for controlling the presence or absence of magnetic bubbles sent from the bubble generator into the transparent transfer channel, thereby forming a magnetic bubble pattern on the magnetic material for generating magnetic bubbles; means for projecting onto the photoreceptor; and means for transferring the magnetic bubble pattern on the transparent transfer channel such that the projected magnetic bubble pattern on the photoreceptor scans the band in synchronization with the movement of the photoreceptor. A printer featuring 2. The printer according to claim 1, wherein the photoreceptor is a selenium drum.