JP2003101062A - Method and apparatus of recording electrostatic latent image - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the S/N ratio in an electrostatic latent image recording method and an electrostatic latent image recording apparatus which records the intensity distribution information of recording light, in a subject on an electrostatic recording body. SOLUTION: The electrostatic latent image recording apparatus comprises a switch 52 for switching the application of voltage from a power supply 53 to a detector 10, a high-voltage generator 62 for supplying a high voltage HV to a radiation source 61, and a control means 70 for controlling a light source control means 40. The control means 70 sets a control signal C1 inputted to a light source control means 40 to L, while a control signal C2 inputted to a switch 52 is set to L, and the electrode of a first conductivity layer 11 and a stripe electrode 16 are set to the same potential, allows a planar light source 30 to emit EL light as the exposure light, and makes a photoconductive layer 4 for reading conduct idle reading for applying the exposure light. After the irradiation of the exposure light is stopped and idle reading is stopped, radiation Q is applied to the first conductivity layer 11 to record electrostatic latent images in the detector 10, while the recording voltage for generating avalanche amplification operation is being applied between the electrode of the first conductivity layer 11 and the stripe electrode 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrostatic latent image recording method and apparatus for recording intensity distribution information of recording light on an electrostatic recording body as an electrostatic latent image.

[0002]

2. Description of the Related Art Conventionally, in medical X-ray photography and the like, a selenium plate made of, for example, a-Se (amorphous selenium), which is sensitive to X-rays, is used to reduce the exposure dose to a subject and to improve diagnostic performance. And the like are used as electrostatic recording bodies (photoconductors, radiation solid state detectors), and the electrostatic recording bodies are irradiated with recording radiation such as X-rays carrying radiation image information to obtain radiation image information. A latent image charge carrying a charge is accumulated in the electricity storage section of the electrostatic recording medium, and then the electrostatic recording medium is scanned with a reading light (reading electromagnetic wave) such as a laser beam to generate a current generated in the electrostatic recording medium. A system is known in which an electrostatic latent image carried by a latent image charge, that is, a radiation image information is read by detecting through a flat plate electrode or a comb electrode on both sides of the electrostatic recording body.

This system uses an electrostatic recording medium having electrodes on both ends and at least one photoconductive layer disposed inside the electrode, and a state in which a recording voltage is applied to both electrodes. To irradiate recording radiation to form an electrostatic latent image on the electricity storage section of the electrostatic recording body, and then short-circuit both electrodes of the electrostatic recording body to the same potential, and A pair of electrons and holes generated at the interface between the reading light side electrode and the photoconductive layer by scanning the photoconductive layer of the electrostatic recording body with the reading light through the transparent electrode (hereinafter referred to as the reading light side electrode). An electrostatic latent image is electrically read by photo-induced discharge by (charge pair). In this system, when the electrostatic latent image is read, no current flows in the dark part of the image, and a larger current flows in the bright part of the image. In addition, a system in which both electrodes of the electrostatic recording body are short-circuited after recording and a larger current flows toward the bright portion of the image is called a positive type system. The electrographic recording material is called a positive type electrostatic recording material.

A specific layer structure of such a positive type electrostatic recording medium is, for example, a first conductive layer (recording light side conductive layer; hereinafter the same) / recording photoconductive layer / trap as a storage section. Layer / reading photoconductive layer / second conductive layer (reading light side conductive layer; hereinafter the same) (US Pat. No. 4,535,546)
No. 8), first conductive layer / photoconductive layer for recording / reading /
A device comprising a second conductive layer and having a power storage unit formed at the interface between the photoconductive layer and the second conductive layer (Medical Physics, Vol. 16, No. 16).
1, Jan / Feb 1989; P105-P109), first conductive layer / insulator layer /
For example, there is a recording / reading photoconductive layer / second conductive layer in which a power storage unit is formed at the interface between the insulating layer and the photoconductive layer. The first and second conductive layers are layers corresponding to the above-mentioned both-end electrodes.

Further, the applicant of the present application, as a positive type electrostatic recording body, exhibits photoconductivity by being irradiated with a first conductive layer having a permeability for recording radiation and a recording radiation. The photoconductive layer for recording and the first conductive layer act substantially as an insulator with respect to the charges having the same polarity as that of the charges, and also as a substantially conductor with respect to the charges of the same polarity and the opposite polarity. Charge transport layer that acts as a reading light, reading light (reading electromagnetic wave)
Is formed by laminating a reading photoconductive layer that exhibits photoconductivity by being irradiated with the second photoconductive layer and a second conductive layer that is transparent to the reading light in this order. Proposals have been made in which a power storage unit is formed at the interface (Japanese Patent Application Laid-Open No. 2-216058)
000-105297, 2000-284056.
No. 2000-284057).

[0006]

However, in any of the positive type electrostatic recording bodies, the interface between the second conductive layer which is transparent to the reading light and the photoconductive layer made of a-Se or the like is formed. A barrier electric field is formed, and the radiation dose for recording is 0 m.
Even in the R region, a current flows due to the irradiation of the reading light,
There is a problem of so-called photovoltaic noise.

Further, the photoconductive layer of the electrostatic recording body has a-S
A high-resistance amorphous substance having a trap such as e is generally used. However, from applying a voltage (generally, high voltage) between both electrodes (first and second conductive layers) of the electrostatic recording medium to short-circuiting. In between, charges are injected from the electrode into the photoconductive layer, and the injected charges are trapped as space charges, while they are not trapped as space charges and a dark current flows in the photoconductive layer as leakage current. However, there is a problem in that this dark current is accumulated in the power storage unit as a dark latent image and appears as dark latent image noise in the reproduced image during reading. This dark current has a property that it is large at the beginning of voltage application, decreases with time, and then approaches a constant leakage current value. That is, the dark current level immediately after the voltage application is higher than the dark current level in the stabilized state (stable leakage current state). This phenomenon is more remarkable as the applied voltage is higher, and it may take, for example, 10 minutes or more to stabilize the leakage current level. Furthermore, even if the voltage is once stabilized, when both electrodes are short-circuited and the voltage application is suspended for a while, the dark current level tends to return to the original level immediately after the voltage is applied again. Therefore, the dark latent image due to the large level of dark current immediately after the voltage application becomes a large noise source during reading. Furthermore, the amount of this dark latent image changes with the time from the application of voltage to the irradiation of recording radiation and the history of use, so the image data is stored so that dark latent image noise does not appear in the reproduced image. It is also difficult to correct.

[0008] On the other hand, the applicant of the present application has disclosed the above-mentioned Japanese Patent Laid-Open No.
No. 105297, a pre-exposure light is irradiated onto a reading photoconductive layer while a voltage is being applied and before the recording radiation is irradiated, and the recording radiation is irradiated by utilizing the rectifying property of the charge transport layer. We have proposed a method for preventing image deterioration that reduces the dark latent image and afterimage that have accumulated in the power storage unit before the operation.

Furthermore, a slight hole barrier is formed by appropriately providing a barrier between the charge transport layer and the recording photoconductive layer, and holes are accumulated in the hole barrier by pre-exposure to form a flat band, It also proposes to reduce photovoltaic noise.

However, these methods can be realized only in the electrostatic recording body including the charge transport layer described in Japanese Patent Application Laid-Open No. 2000-105297 proposed by the applicant of the present application, and other electrostatic methods described above. The recording medium is disclosed in
The method described in Japanese Patent Laid-Open No. 105297 cannot be applied.

Further, it is not easy to form a hole barrier at the interface between the charge transport layer and the recording photoconductive layer to the extent that the photoelectromotive force is just canceled.

Further, when the dark current from the reading light side electrode is originally larger and a dark latent image having a polarity opposite to that of the electrostatic latent image is formed on the electricity storage unit, the pre-exposure is rather performed. This will increase the dark latent image.

Therefore, the applicant of the present invention filed Japanese Patent Application No. 11-1
No. 94546, the photoconductive layer is irradiated with pre-exposure light in a state where the electrodes of the first conductive layer and the electrodes of the second conductive layer are at the same potential, and the blank reading is stopped. In the case of using a positive-type electrostatic recording medium of the optical readout type, by irradiating the recording radiation with the recording voltage applied to the recording layer to record the electrostatic latent image, It proposes an electrostatic latent image recording method and apparatus which can both reduce and stabilize the dark latent image formed immediately after voltage application and stabilize the dark latent image.

The present invention is based on the above-mentioned Japanese Patent Application No. 11-194546.
The method and apparatus described in
It was devised to improve the N. When using an optical read-out type positive electrostatic recording medium, S / N
It is an object of the present invention to provide an electrostatic latent image recording method and apparatus capable of improving the above.

[0015]

According to the electrostatic latent image recording method of the present invention, a first conductive layer which is transparent to recording light and a recording layer which exhibits photoconductivity by being irradiated with the recording light. For use as a latent image charge, a reading photoconductive layer that exhibits photoconductivity by being irradiated with reading light, and a reading photoconductive layer. In the electrostatic latent image recording method of recording the intensity distribution information of the recording light as an electrostatic latent image in the electricity storage section of the electrostatic recording body, which is laminated with a second conductive layer having a transparency in this order,
A voltage that causes avalanche amplification in the recording photoconductive layer is applied between the first conductive layer and the second conductive layer, and an electrostatic latent image is recorded with the voltage applied. It is characterized by doing.

The electrostatic recording body used in the present invention has a first conductive layer, a recording photoconductive layer, a reading photoconductive layer and a second conductive layer in this order, and also has a recording photoconductive layer. A power storage unit is formed between the reading photoconductive layer and the reading photoconductive layer, and further other layers and micro conductive members (micro plates)
It may be formed by stacking.

The electrostatic latent image recording apparatus according to the present invention is
A first conductive layer that is transparent to recording light, a recording photoconductive layer that exhibits photoconductivity when irradiated with recording light, and a latent image charge that has an amount of charge according to the amount of recording light. And a photoconductive layer for reading that exhibits photoconductivity when irradiated with the reading light, and a second conductive layer that is transparent to the reading light. In an electrostatic latent image recording apparatus that includes an electrostatic recording body and records the intensity distribution information of recording light as an electrostatic latent image in a power storage unit of the electrostatic recording body, a voltage that causes avalanche amplification in a recording photoconductive layer. Is provided between the first conductive layer and the second conductive layer.

In the electrostatic latent image recording device according to the present invention,
The recording photoconductive layer preferably contains amorphous selenium as a main component.

[0019]

According to the electrostatic latent image recording method and apparatus of the present invention, a voltage that causes avalanche amplification in the recording photoconductive layer is applied between the first conductive layer and the second conductive layer. As a result, even when the amount of charge pairs (the number of signal photons) generated by the incidence of the recording light is small, the generated charge amount can be amplified by the avalanche amplification action, and thus a sufficiently large signal can be obtained. At the same time, it is possible to increase the ratio of the bright current and the dark current and obtain a signal with good S / N.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a schematic diagram of a radiographic image capturing and reading apparatus to which an electrostatic latent image recording apparatus according to the present invention is applied.

As shown in FIG. 1, the radiation image capturing / reading apparatus 1 includes a radiation solid-state detector (hereinafter also simply referred to as a detector) 10 as an electrostatic recording body, and a planar light source laminated on the detector 10. 30, a light source control unit 40 for controlling the planar light source 30, and a reading unit 20 including a current detection circuit 50 for reading out electric charges of the detector 10, a radiation irradiation unit 60, and the current detection circuit 50 and the radiation irradiation unit 60. And the control means 70 that are set.

Incidentally, the electrostatic latent image recording device portion is the detector 10
And a voltage applying means, which will be described later, in the current detecting circuit 50, a radiation irradiating section 60, and a controlling means 70.

The detector 10 is Japanese Patent Application No. 11-194546.
Of the improved direct conversion system (direct conversion and optical reading system) described in No. 1, which is a first conductive layer 11 having transparency to recording radiation described later, and the conductive layer 11. The recording photoconductive layer 12 that exhibits conductivity by being irradiated with the radiation that has passed through the recording layer 12 and the conductive layer 11 acts as an insulator substantially against the charges charged in the recording photoconductive layer 12 and has a charge having a polarity opposite to that of the charges. On the other hand, the charge transport layer 13 that acts substantially as a conductor, the reading photoconductive layer 14 that exhibits conductivity by being irradiated with a reading electromagnetic wave described below, and the second conductivity that is transparent to the reading light. The layer 15 is laminated in this order.

Amorphous selenium is used for the recording photoconductive layer 12.

The second conductive layer 15 is formed by arranging a large number of linear electrodes (hatched portions in the figure) in stripes. Hereinafter, the electrode of the second conductive layer 15 is referred to as a stripe electrode 16, and each linear electrode is referred to as an element 16a.

The planar light source 30 includes a conductive layer 31 and an EL layer 3.
2 is an EL light emitting body including a conductive layer 33, and is laminated on the detector 10 as described above. An insulating layer 34 is provided between the stripe electrode 15 of the detector 10 and the conductive layer 31. The conductive layer 31 is formed by arranging a large number of linear elements (hatched portions in the figure) 31a in a stripe shape, and each element 31a intersects with each element 16a of the stripe electrode 16 of the detector 10 (main (Approximately orthogonal in the example)
Are arranged so that the element 3
A plurality of line-shaped light sources 1a are arranged in a plane. Each element 31a is a light source control means 4
It is connected to 0.

The light source control means 40 applies a predetermined voltage between the element 31a and the conductive layer 33 facing the element 31a, individually applies a voltage to the element 31a at the time of reading, and plural or all at the time of pre-exposure. The voltage is simultaneously applied to the element 31a. For example, when a predetermined DC voltage is applied between each element 31a and the conductive layer 33 while sequentially switching the elements 31a, the EL sandwiched between the element 31a and the conductive layer 33.
EL light is emitted from the layer 32, and the EL light transmitted through the element 31a is line-shaped reading light (hereinafter referred to as line light).
Used as. That is, as the planar light source 30,
This is equivalent to a large number of line-shaped minute light sources arranged in a plane, and the EL elements 31a are sequentially switched for all of the stripe electrode 16 from one end to the other end in the longitudinal direction to emit EL light. The entire surface of the stripe electrode 16 is electrically scanned. The longitudinal direction of the element 16a corresponds to the sub scanning direction, and the extending direction of the line light corresponds to the main scanning direction.

On the other hand, a plurality or all of the elements 31a
When a voltage is applied to the
EL light is emitted substantially uniformly from the layer 32 over the entire surface of the stripe electrode 16, and the EL light is emitted as pre-exposure light or the detector 10.
It is used as exposure light (hereinafter referred to as simultaneous exposure light) emitted when a voltage is applied to the. That is, the planar light source 3
0 functions not only as a reading light source, but also as a light source for pre-exposure to be described later and exposure when an empty voltage is applied (hereinafter referred to as simultaneous exposure).

A control signal C1 is input to the light source control means 40, and the control signal C1 is L (low).
In the case of, the pre-exposure mode emits the EL light as the pre-exposure light or the simultaneous exposure light, and in the case of H (high), the read light mode emits the EL light as the read light. When the control signal C1 is in the high impedance state, E is emitted from the planar light source 30.
L light cannot be emitted.

The current detection circuit 50 includes a stripe electrode 16
Each element 16a has a large number of current detection amplifiers 51 connected to the inverting input terminal. In the present embodiment, the recording photoconductive layer 12 is formed of amorphous selenium. However, in the amorphous selenium, avalanche amplification is a phenomenon that occurs only when carriers are holes. The positive electrode of the power supply 53 is connected to the first conductive layer 11 of the detector 10 and the negative electrode of the power supply 53 is connected to the switch 52 to form an electric field in the direction in which a hole moves toward the power storage unit 19.
Connected to one input. The other input of the switch 52 is connected to the first conductive layer 11 of the detector 10.
It should be noted that the switch 52 and the power source 53 constitute a voltage applying means according to the present invention.

The output of the switch 52 is the current detection amplifier 5
1 is commonly connected to the non-inverting input terminal of the operational amplifier (not shown). By irradiating (scanning exposure) the line light as the reading light from the planar light source 30 to the stripe electrode 16 side, each current detection amplifier 51 causes the current flowing in each element 16a to be supplied to each connected element 16a.
Simultaneously (parallelly) detected for a.

Although a detailed description of the configuration of the current detection amplifier 51 is omitted, various well-known configurations can be applied. Depending on the configuration of the current detection amplifier 51, the switch 52, the power source 53, and each element 1
Of course, the connection mode with 6a is different from the above.

The radiation irradiating section 60 comprises a radiation source 61 for emitting the radiation R, a high voltage generator 62 for generating electric power for driving the radiation source 61, and a switch 63 connected to the high voltage generator 62 for controlling imaging. Become. Switch 6
3 is a two-stage switch including switches 63a and 63b, and is configured so that the switch 63b does not turn on unless the switch 63a turns on.

The control means 70 is provided with the signals S1 and S2 from the switches 63a and 63b in order to automatically perform the operation described later at a predetermined timing.
The standby signal S4 from the high voltage generator 62, the irradiation end signal S5 indicating the end of irradiation of the recording radiation, the signal S6 indicating the set irradiation time of the recording radiation, and the irradiation of the pre-exposure light from the light source control means 40 are completed. Irradiation end signals S7 indicating that the respective signals have been input are input, and the control means 70
The control signal C1 is transmitted to the light source control means 40 by the switch 5
2 and the control signal C3 is output to the high voltage generator 62, respectively.

When the control signal C2 is H, the switch 52
Is switched to the power source 53 side, and a DC voltage is applied from the power source 53 to the detector 10 (specifically, between the electrode of the first conductive layer 11 and the stripe electrode 16). On the other hand, when the control signal C2 is L, the switch 52 is switched to the first conductive layer 11 side, and the first conductive layer 11 is connected through the imaginary short circuit of the operational amplifier (not shown) that constitutes the current detection amplifier 51.
The electrode and the stripe electrode 16 are substantially short-circuited and both electrodes are made to have the same potential. When the control signal C2 is in the high impedance state, the switch 52 is set to the midpoint, and the positive electrode of the power source 53 is in the floating state.
No voltage is applied to the detector 10 and neither electrode is made to have the same potential. The high voltage generator 62 has a control signal C
When H is input as 3, the high voltage HV is applied to the radiation source 6
1 to generate radiation R from the radiation source 61.

The operation of the radiographic image capturing and reading apparatus 1 having the above structure will be described below.

First, a recording voltage is applied in the recording photoconductive layer 12 so that an avalanche amplification action works. In the present embodiment, the recording photoconductive layer 12 is formed of amorphous selenium. However, in the amorphous selenium, avalanche amplification is a phenomenon that occurs only when carriers are holes. Recording is performed by forming an electric field in a direction in which a hole moves toward the electricity storage unit 19 and further by setting the recording voltage to a voltage such that an electric field strength of about 100 V / μm is applied to the recording photoconductive layer 12. The avalanche amplifying action comes to work in the photoconductive layer 12 for use, which makes it possible to amplify the amount of generated charges, so that a sufficiently large signal can be obtained and at the same time, the ratio of the bright current to the dark current is increased. Let
A signal can be obtained with good S / N.

The first conductive layer 1 under the condition that a recording voltage is applied.
Radiation Q is emitted as recording light to 1 to record an electrostatic latent image on the detector 10. Specifically, first, the switch 52 is switched to the power supply 53 side so that the charge generated in the recording photoconductive layer 12 in the detector 10 can be accumulated in the power storage unit 19, and the electrode of the first conductive layer 11 is switched. And stripe electrode 1
6, a DC voltage of a predetermined magnitude as a recording voltage, for example, a voltage such that an electric field strength of about 100 V / μm is applied to the recording photoconductive layer 12 is applied between Charge both.

After the application of the recording voltage, the high voltage HV is supplied from the high voltage generator 62 to the radiation source 61, and the radiation R is emitted from the radiation source 61. By irradiating the subject 65 with this radiation R and irradiating the detector 10 with the recording radiation Q carrying the radiation image information of the subject 65 that has passed through the subject 65, the recording light of the detector 10 is irradiated. Positive and negative charge pairs are generated in the conductive layer 12. At this time, since a voltage is applied between the electrode of the first conductive layer 11 and the stripe electrode 16 so that an avalanche amplification action works, the generation of positive and negative charge pairs rapidly increases in the photoconductor. .

The electrode of the first conductive layer 11 and the stripe electrode 1
Since the recording voltage is applied between the element 6 and 6, the negative charges in the generated charge pairs are concentrated on each element 16a of the stripe electrode 16 along a predetermined electric field distribution,
It is accumulated as a latent image charge in the electricity storage unit 19 which is an interface between the recording photoconductive layer 12 and the charge transport layer 13. Since the amount of latent image charge is approximately proportional to the amount of irradiation radiation, this latent image charge carries an electrostatic latent image. On the other hand, positive charges generated in the recording photoconductive layer 12 are attracted to the first conductive layer 11,
The negative charges injected from the power source 53 recombine with the charges and disappear.

Next, when reading the electrostatic latent image from the detector 10, first the control signal C1 is set to H (reading light mode),
The switch 52 is connected to the first conductive layer 11 side of the detector 10, and the light source control means 40 sequentially switches the elements 31 a while sequentially switching the elements 31 a and the conductive layer 33.
A predetermined direct current voltage is applied between the two, and the entire surface of the detector 10 is electrically scanned with the line light emitted from the EL layer 32.

By scanning with the line light, positive and negative charge pairs are generated in the photoconductive layer 14 to which the line light corresponding to the sub-scanning position is incident, and the positive charge therein is the negative charge accumulated in the electricity storage unit 16 ( It rapidly moves in the charge transport layer 13 so as to be attracted to the latent image charge, and is recombined with the latent image charge in the electricity storage unit 16 to disappear. On the other hand, the negative charges generated in the photoconductive layer 14 are recombined with the positive charges injected into the stripe electrode 16 from the power source 53 and disappear. In this way, the detector 1
The negative charge accumulated in the power storage unit 19 of 0 disappears due to the charge recombination, and a current due to the movement of the charge at the time of the charge recombination occurs in the detector 10. This current is applied to each element 1
The respective current detection amplifiers 51 connected for every 6a simultaneously detect. Since the current flowing through the detector 10 during reading corresponds to the latent image charge, that is, the electrostatic latent image, the intensity distribution information of the recording light, that is, the image information is acquired by detecting this current. You can

Next, a comparison of the detected charge amount between the case where the recording voltage is set to a voltage that produces the avalanche amplification effect and the case where it is set to the conventional voltage will be described.

The sensor size of the electrostatic recording body is 180 mm
× 240 mm, the pixel pitch is 100 μm × 100 μm, and the recording photoconductive layer is composed of amorphous selenium-based 200.
With a thickness of μm, a photoconductive layer for reading having a thickness of 10 μm mainly composed of amorphous selenium, and without a scintillator, the voltage applied to the electrostatic recording body is 21 kV (voltage causing avalanche amplification) and 2.1 kV (avalanche amplification). The voltage that does not produce the effect).

Further, the photographing was performed by mammography, and the photographing conditions were X-ray tube voltage of 25 kVMo tube and X-ray dose of 100 mR.

As a result, compared with the conventional recording voltage of 2.1 kV, the detected charge amount was about 100 times when the recording voltage was 21 kV, and the S / N ratio was remarkably improved. In addition, since the avalanche amplification factor spatially changed and shading occurred due to the non-uniform thickness of the photoconductive layer, good image quality was obtained by performing calibration in advance and correcting the gain. .

As shown in FIG. 2, the first conductive layer 11
Recording is performed by irradiating the photoconductive layer with pre-exposure light in the state where the potential of the first electrode and the stripe electrode 16 are at the same potential, stopping the idle reading, and then applying a recording voltage between both electrodes. When an electrostatic latent image is recorded by irradiating radiation for use in light irradiation, a light fatigue state (trap accumulation state) is present at the light incident interface (electron-hole pair formation region) irradiated with the pre-exposure light.
Is temporarily formed, and photovoltaic noise that may occur when the reading light is irradiated is reduced and stabilized by the light fatigue state, which is more desirable.

Further, if a blank voltage is applied between both electrodes for a predetermined time before the blank reading, a blank voltage is applied to the inside of the photoconductive layer or the photoconductive layer. A stable high-resistance space charge state is formed at the interface between the electrode and the electrode, and a state in which a dark latent image is less accumulated in the power storage unit is realized. For this reason, immediately after the recording voltage is applied, there is no possibility that a large level of dark latent image noise will occur as in the prior art, and the dark latent image noise is reduced and stabilized, which is more desirable.

As recording light, in addition to radiation, 5
Electromagnetic waves having a wavelength of 50 nm or less may be used. Also,
The recording photoconductive layer is not limited to amorphous selenium, and any film may be used as long as it is a film that causes avalanche amplification. Further, the second conductive layer may be a single electrode without forming the stripe electrode to detect the one-dimensional information.

[Brief description of drawings]

FIG. 1 is a schematic diagram of a radiographic image capturing and reading apparatus to which an electrostatic latent image recording method and apparatus according to an embodiment of the present invention are applied.

FIG. 2 is a timing chart for explaining the operation of the embodiment shown in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Radiation image photographing / reading apparatus 10 Electrostatic recording body 20 Reading section 30 Planar light source (functions as means for reading light, pre-exposure light, and simultaneous exposure light) 40 Light source control means 50 Current detection circuit 60 Radiation irradiation section 70 Control means

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) G03G 5/08 101 G21K 4/00 K G21K 4/00 H01L 31/10 B H01L 31/08 31/08 Q F-term (reference) 2G083 AA04 BB03 CC10 DD01 DD11 DD18 EE02 EE03 2G088 EE01 FF02 GG21 JJ05 JJ09 JJ31 LL11 LL12 LL15 2H068 CA11 GA01 GA13 5F049 MA07 MB05 NA04 NA05 NB05 UA20 BA04 AB08 BA05 BA05 BA08 BA05 BA08 BA05 BA05 BA088A05

Claims (3)

[Claims] 1. A first conductive layer having transmissivity for recording light, a recording photoconductive layer exhibiting photoconductivity by being irradiated with the recording light, and a recording conductive layer according to a light amount of the recording light. A power storage unit for accumulating a certain amount of electric charge as a latent image charge, a reading photoconductive layer exhibiting photoconductivity by being irradiated with reading light, and a second conductive layer having transparency to the reading light. To
In an electrostatic latent image recording method of recording intensity distribution information of recording light as an electrostatic latent image on the electricity storage unit of an electrostatic recording body laminated in this order, a voltage that causes avalanche amplification in the recording photoconductive layer. Is applied between the first conductive layer and the second conductive layer, and the electrostatic latent image is recorded with the voltage applied. 2. A first conductive layer having transmissivity for recording light, a recording photoconductive layer exhibiting photoconductivity by being irradiated with the recording light, and a light-transmitting layer according to the amount of the recording light. A power storage unit for accumulating a certain amount of electric charge as a latent image charge, a reading photoconductive layer exhibiting photoconductivity by being irradiated with reading light, and a second conductive layer having transparency to the reading light. To
An electrostatic latent image recording apparatus comprising an electrostatic recording body formed by stacking in this order, and recording the intensity distribution information of recording light as an electrostatic latent image in the electricity storage unit of the electrostatic recording body, An electrostatic latent image recording device comprising: a voltage applying unit that applies a voltage that causes avalanche amplification to a layer between the first conductive layer and the second conductive layer. 3. The electrostatic latent image recording device according to claim 2, wherein the recording photoconductive layer contains amorphous selenium as a main component.