JPH06102683A - Electrophotographic sensitive body, electrophotographic device provided with the same and facsimile equipment - Google Patents

Abstract

PURPOSE:To obtain the photosensitive layer which is high in sensitivity, small in change in bright part voltage and dark part voltage at continuous image forming by repeated charge and exposure, excellent in durability, moreover, very small in transferred memory even at reversal developing system, and prevents the crack of the photosensitive layer and crystalization of the charge transfer material by incorporating the fluorene compd. having specified structure in a photosensitive layer. CONSTITUTION:The body has the photosensitive layer containing the fluorene compd. expressed by the formula. In the formula, R1 is hydrogen, halogen atom, alkyl, alalkyl, amino, alkoxy group which may have substd. group or hydroxy group, Ar1 and Ar2 is arom. or heterocyclic group which may have substd. group., (n) is integer 2-10. The electrophotographic sensitive body is composed by combination of the charge transfer material consisting of the fluorene compd. and a suitable charge generating material. That is, the charge transfer layer is formed by combination of the fluorene compd. and the suitable binder resin.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrophotographic photosensitive member, an electrophotographic apparatus equipped with the electrophotographic photosensitive member, and a facsimile.

[0002]

2. Description of the Related Art Conventionally, as an electrophotographic photoreceptor, an inorganic photoreceptor having a photosensitive layer containing selenium, cadmium sulfide, zinc oxide or the like as a main component has been widely used. Although these have some basic properties, they have problems in film-forming property and plasticity. Further, the inorganic photoconductive material is generally highly toxic, and there are great restrictions in manufacturing and handling.

On the other hand, an organic photoconductor containing an organic conductive compound as a main component has many advantages such as supplementing the above-mentioned drawbacks of the inorganic photoconductor, and many proposals have been made and some have been put into practical use. There is. As such an organic photoreceptor, a charge transfer complex formed from a photoconductive polymer represented by poly-N-vinylcarbazole and a Lewis acid such as 2,4,7-trinitro-9-fluorenone is used. A photoreceptor containing the main component has been proposed. Although these organic photoconductive polymers are excellent in terms of lightness and film forming property, they are inferior to inorganic photoconductive materials in terms of sensitivity, durability, stability due to environmental changes, etc. is not.

The function-separated type electrophotographic photosensitive member in which the charge generating function and the charge transporting function are shared by different substances brings about a remarkable improvement in the sensitivity and durability which have been the drawbacks of the conventional organic photosensitive members. . Such a function-separated type photoreceptor is
The material selection range of each of the charge generating substance and the charge transporting substance is wide, and it has an advantage that an electrophotographic photoreceptor having arbitrary characteristics can be prepared relatively easily. As charge generating materials, azo pigments, polycyclic quinone pigments, cyanine dyes, squaric acid dyes, pyrylium salt dyes, etc. are known. Among them, azo pigments have strong light resistance, large charge generation ability, and material synthesis. Many pigments have been proposed because of their ease of use. As the charge transport material, for example, Japanese Patent Publication No.
No. 2-4188, Pyrazoline Compound, JP-B-55-
42380 and JP-A-55-52063, hydrazone compounds, JP-B-58-32372 and JP-A-61-132955, triphenylamine compounds, JP-A-54-151955 and JP-A-54-151955. The stilbene compound of 58-198043 is known. These charge transport materials are required to be stable to light and heat, stable to ozone, NO _x , nitric acid, etc. generated by corona discharge, and have high charge transport ability. , High compatibility with organic solvents and binders, easy production, and low cost. Further, in response to the demand for higher durability of electrophotographic photoreceptors in recent years, a protective layer is provided on the photosensitive layer for the purpose of improving durability, or a copying machine or a laser beam printer is used.
For example, when the photoconductor is stored for a long period of time, the charge transport layer may be cracked, or the charge transport material may be crystallized or phase-separated, resulting in an image defect. Further, in a recent reversal development system compatible with digitalization, since the primary charging and the transfer charging have opposite polarities, a so-called transfer memory having different charging properties depending on the presence / absence of transfer is generated, which is very likely to appear as density unevenness on an image. There is.

Conventional electrophotographic photoreceptors using a low molecular weight organic compound as a charge transport material satisfy some of the above-mentioned problems and requirements, but none satisfy all of them at a high level. is there.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to provide an electrophotographic photosensitive member which has a large sensitivity and can maintain a stable electric potential during repeated use. Provided is an electrophotographic photosensitive member which is provided with a protective layer and does not cause cracks in the charge transport layer or crystallization of the charge transport compound even when stored for a long time in a copying machine or a laser beam printer. Thirdly, to provide an electrophotographic photoreceptor in which transfer memory is less likely to occur even in a reversal development system,
Fourthly, to provide a novel organic photoconductive compound which can be easily manufactured and can be provided at low cost, and to provide an electrophotographic apparatus and a facsimile equipped with the electrophotographic photosensitive member.

[0007]

The present invention comprises an electrophotographic photosensitive member characterized by having a photosensitive layer containing a fluorene compound represented by the following general formula (1). General formula (1)

[Chemical 2] In the formula, R ₁ represents a hydrogen atom, a halogen atom, an optionally substituted alkyl group, an aralkyl group, an amino group, an alkoxy group or a hydroxyl group, and Ar ₁ and Ar ₂ may have a substituent. Represents an aromatic ring group or a heterocyclic group, n is 2
It is an integer of -10.

In the formula, A represents an aromatic hydrocarbon ring which may have a substituent or a divalent heterocyclic group containing a nitrogen atom in the ring.

Specifically, the halogen atom is a fluorine atom, a chlorine atom, a bromine atom or the like, the alkyl group is a group having 1 to 4 carbon atoms, the aralkyl group is a group such as benzyl, phenethyl or naphthylmethyl, and an amino group. As a group such as dimethylamino and diphenylamino, as an alkoxy group such as methoxy, ethoxy and propoxy,
The aromatic ring group is a group such as phenyl, naphthyl, anthryl, and pyrenyl, and the heterocyclic group is thienyl, furyl,
Examples include groups such as pyridyl and quinolyl.

The substituent which the above-mentioned group may have is an alkyl group having 1 to 4 carbon atoms, an alkoxy group such as methoxy, ethoxy and propoxy, an aromatic ring group such as phenyl and naphthyl, or fluorine, chlorine, iodine and bromine. And halogen atoms.

Representative examples of the fluorene compound represented by the general formula (1) of the present invention are shown in Tables 1 to 7.

[Table 1]

[Table 2]

[Table 3]

[Table 4]

[Table 5]

[Table 6]

[Table 7]

Synthesis Example (Synthesis of Compound Example 13) 2-bis (4'-methylphenyl) aminofluorene 1
0.0 g was dissolved in 100 ml of N, N-dimethylformamide, cooled to 10 ° C. or lower, and 4.5 g of sodium methoxide was slowly added. After addition is complete, 3
After stirring for 0 minutes, 12.9 g of 1,4-diiodobutane
A 30 ml / N, N-dimethylformamide solution was added dropwise at 10 ° C. or lower. After the dropping is completed, the temperature is returned to room temperature and 3
After stirring for 0 minutes, heating and stirring were performed at 60 to 70 ° C. for 4 hours.
The reaction solution was opened in ice water, extracted with toluene, and then separated and purified with a silica gel column to obtain 4.6 g of the desired compound (melting point: 1
46.5-148.0C).

Other compounds are generally synthesized by a similar method.

The electrophotographic photosensitive member of the present invention is constituted by combining a charge transporting material composed of the fluorene compound represented by the general formula (1) with an appropriate charge generating material. Examples of the configuration of the photoconductor include the following forms. (1) Layer containing charge generating substance / layer containing charge transporting substance (2) Layer containing charge transporting substance / layer containing charge generating substance (3) Layer containing charge generating substance and charge transporting substance (4) Layer containing charge generating substance / layer containing charge generating substance and charge transporting substance

Since the fluorene compound represented by the general formula (1) has a high hole-transporting ability, it can be used as a charge-transporting substance in the photosensitive layer of the above-mentioned form.
When the form of the photosensitive layer is (1), it is preferably negatively charged, when it is (2), it is preferably positively charged, and when it is (3) or (4), both positively charged and negatively charged can be used.

In the electrophotographic photosensitive member of the present invention, a protective layer or an insulating layer may be provided on the surface of the photosensitive layer in order to improve adhesiveness and control charge injection. The electrophotographic photoconductor of the present invention is not limited to the basic constitution of the photoconductor.

Of the above basic constitutions, the form (1) is particularly preferable and will be described in more detail. In the present invention, as the conductive support, for example, a metal or alloy such as aluminum, aluminum alloy, stainless steel, or copper in a plate shape or a drum shape, a non-conductive support such as glass, resin, or paper, or the above conductive material is used. Thin film formed by vapor-depositing or laminating a metal such as aluminum, palladium, rhodium, gold or platinum on a non-conductive support, non-conductive support such as glass, resin, paper or the above-mentioned conductive support Examples thereof include those formed by depositing or coating a layer of a conductive substance such as a conductive polymer, tin oxide, or indium oxide.

In the present invention, as the charge generating substance,
For example, azo pigments such as monoazo, disazo and trisazo, phthalocyanine pigments such as metal phthalocyanine and metal-free phthalocyanine, indigo pigments such as indigo and thioindigo, perylene anhydride, perylene pigments such as perylene imide, anthraquinone, Examples thereof include polycyclic quinone pigments such as pyrenequinone, squarylium dyes, pyrylium salts, thiopyrylium salts, triphenylmethane dyes, selenium, and inorganic substances such as amorphous silicon.

The charge generation layer can be formed by dispersing the above-mentioned charge generation substance in an appropriate binder resin to prepare a coating solution, and coating this on a conductive support. . Alternatively, it can be formed by forming a thin film on the conductive support by a dry method such as vapor deposition, sputtering or CVD.

The binder resin can be selected from a wide range of binder resins, for example, polycarbonate, polyester,
Polyarylate, butyral resin, polystyrene, polyvinyl acetal, diallyl phthalate resin, acrylic resin, methacrylic resin, vinyl acetate resin, phenol resin, silicone resin, polysulfone, styrene-butadiene copolymer, alkyd resin , Epoxy resin, urea resin, vinyl chloride-succin vinyl copolymer, and the like. You may use these individually or in mixture of 2 or more types as a homopolymer or a copolymer.

The content of the resin in the charge generation layer is 80% by weight or less, preferably 40% by weight or less. The film thickness of the charge generation layer is preferably 5 μm or less, and particularly preferably 0.01 to 2 μm. Further, various sensitizers may be added to the charge generation layer.

The charge transport layer can be formed by combining the fluorene compound represented by the general formula (1) and a suitable binder resin. Examples of the binder resin include the binder resin used in the charge generation layer, and further include photoconductive polymer compounds such as polyvinyl carbazole and polyvinyl anthracene.

The compounding ratio of the binder resin and the fluorene compound represented by the general formula (1) is preferably 10 to 500 parts by weight of the fluorene compound per 100 parts by weight of the binder resin. The thickness of the charge transport layer cannot be increased more than necessary because it has a limit for transporting charge carriers, but it is preferably in the range of 5 to 40 μm, particularly 10 to 30 μm. Further, an antioxidant, an ultraviolet absorber, a plasticizer or a known charge transporting substance can be added to the charge transporting layer as required.

The charge generation layer and the charge transport layer are formed by a dip coating method, a spray coating method,
Spinner coating method, Roller coating method,
It can be carried out by using a coating method such as a Mayer coating method or a blade coating method.

The electrophotographic photoreceptor of the present invention can be used not only in electrophotographic copying machines, but also in laser beam printers, C
RT printer, LED printer, liquid crystal printer,
It can also be widely used in electrophotographic application fields such as laser plate making and facsimile.

The present invention also comprises an electrophotographic apparatus equipped with the electrophotographic photosensitive member of the present invention.

The present invention also comprises an electrophotographic apparatus equipped with the electrophotographic photosensitive member of the present invention and a facsimile having means for receiving image information from a remote terminal.

Next, an electrophotographic apparatus and a facsimile equipped with the electrophotographic photosensitive member of the present invention will be described. Figure 1
The schematic structure of a general transfer type electrophotographic apparatus using the drum type photoreceptor of the present invention is shown in FIG. In the figure, reference numeral 1 denotes a drum type photosensitive member as an image bearing member, which is rotationally driven around a shaft 1a in a direction of an arrow at a predetermined peripheral speed. The photosensitive member 1 is uniformly charged at its peripheral surface by a charging unit 2 at a predetermined positive or negative potential in the course of its rotation, and then at an exposure unit 3 an optical image exposure L (slit exposure Laser
Beam scanning exposure). As a result, electrostatic latent images corresponding to the exposed image are sequentially formed on the peripheral surface of the photoconductor. The electrostatic latent image is then toner-developed by the developing means 4, and the toner-developed image is rotated by the transfer means 5 from a paper feeding portion (not shown) between the photosensitive body 1 and the transfer means 5. Then, the image is sequentially transferred onto the surface of the transfer material P that is fed in synchronization with the above. The transfer material P which has received the image transfer is separated from the surface of the photoconductor and is introduced into the image fixing means 8 where it is subjected to image fixing and printed out as a copy (copy). The surface of the photoreceptor 1 after the image transfer is transferred by the cleaning means 6 to the toner after transfer.
Is removed, the surface is cleaned, the charge is removed by the pre-exposure means 7, and the surface is repeatedly used for image formation. Photoconductor 1
A corona charging device is generally widely used as the uniform charging means 2. Also, as the transfer device 5, corona transfer means is generally widely used. As an electrophotographic apparatus, a plurality of constituent elements such as the photoconductor, the developing unit, and the cleaning unit described above are integrally combined as an apparatus unit, and the unit is detachably attached to the apparatus main body. It may be configured. For example, the photoconductor 1 and the cleaning means 6 may be integrated into one device unit, and the device body may be detachably configured by using guide means such as a rail. At this time, the above-mentioned apparatus unit may be configured with a charging means and / or a developing means. In addition, the light image exposure L is used for an electrophotographic apparatus such as a copying machine or a printer.
When used as, the reflected or transmitted light from the original,
Alternatively, it is performed by converting the original into a reading signal and scanning the laser beam, driving the light emitting diode array, driving the liquid crystal shutter array, or the like by this signal.
Further, when used as a printer of a facsimile, the light image exposure L becomes an exposure for printing the reception data.

FIG. 2 is a block diagram showing an example of this case. The controller 10 controls the image reading unit 9 and the printer 18. The entire controller 10 is C
It is controlled by the PU 16. The read data from the image reading unit is transmitted to the partner station through the transmission circuit 12. The data received from the partner station is sent to the printer 18 through the receiving circuit 11. Predetermined image data is stored in the image memory. The printer controller 17 controls the printer 18. 13 is a telephone. Line 14
The image (image information from the remote terminal connected via the line) received from the demodulator is demodulated by the receiving circuit 11, and then the CPU 16 performs signal processing of the image information and sequentially stores it in the image memory 15. . When at least one page of image is stored in the memory 15, the image of that page is stored. The CPU 16 reads out one page of image information from the memory 15 and sends the one page of image information signaled to the printer controller 17. Upon receiving the image information of one page from the CPU 16, the printer controller 17 controls the printer 18 to record the image information of the page. The CPU 16 is a printer
While recording by 18, the next page is being received.
The image is received and recorded as described above.

[0030]

【Example】

Example 1 6 g of N-methoxymethylated 6-nylon (weight average molecular weight 35,000) and 10 g of alcohol-soluble copolymerized nylon (weight-average molecular weight 35,000) were methanol-coated on an aluminum support.
The solution dissolved in 75 g of the resin was applied with a Mayer bar to form an undercoat layer having a film thickness after drying of 1 μm.

Next, 5 g of titanyloxyphthalocyanine was added to a solution prepared by dissolving 3 g of phenoxy resin in 160 g of cyclohexanone, and dispersed by a ball mill for 16 hours. A film thickness after drying of this dispersion on the undercoat layer previously formed was 0.1.
The charge generation layer was formed by coating with a blade coating method to a thickness of 15 μm and drying.

Next, 9 g of the fluorene compound of Compound Example 13 was added to a polycarbonate Z type resin (weight average molecular weight 5
5,000) 10 g was dissolved in 70 g of chlorobenzene, and this was applied on the charge generation layer by a blade coating method so that the film thickness after drying was 19 μm, and dried to form a charge transport layer. An electrophotographic photosensitive member of Example 1 was prepared.

The prepared electrophotographic photosensitive member was subjected to corona discharge of -5 KV. The surface potential (initial potential V ₀ ) at this time was measured. Further, the surface potential of this photoreceptor was measured after leaving it in the dark for 1 second. The sensitivity is the potential V ₁ after dark decay.
Exposure amount (E1 / 6: μJ
/ Cm ² ) was measured to evaluate. On this occasion,
A gallium / aluminum / arsenic ternary semiconductor laser (output: 5 mW, oscillation wavelength 780 nm) was used as a light source.

Next, a laser beam printer which is an electrophotographic printer of the reversal development system equipped with the semiconductor laser as above (a modified model of LBP-SX under the trade name, manufactured by Canon Inc.) ), The electrophotographic photosensitive member prepared in (1) is attached, the primary charging voltage when the transfer current is OFF is set to V _a1 , and the transfer current O
When the primary charging voltage at N is V _a2 , the transfer memory − (V _a1
-V _a2) were measured, it was then image formation test. The conditions are as follows: surface potential after primary charging is -700 V, surface potential after image exposure is -150 V (exposure amount 1.2 μJ / cm ² ), transfer potential is +700 V, developing polarity is negative, and process speed is 47 mm. / Sec, development conditions (development bias) of -450 V, post-image exposure scanning method of image scan, pre-priming charging exposure of 8.1 lux / sec red full-area exposure, image formation with laser beam Line scanning was performed according to the character signal and the image signal, and good prints were obtained for both the character and the signal.

Further, as a test for promoting the cracking of the photosensitive layer, finger oil was adhered to the surface of the electrophotographic photosensitive member prepared above and allowed to stand for 4 hours at room temperature and atmospheric pressure to check whether the photosensitive layer was cracked or not. I observed. Further, as a test for accelerating the formation of crystals of the charge transport compound, finger oil was attached to the surface of the electrophotographic photosensitive member prepared above, and left at 45 ° C. for 4 days to determine whether crystals of the charge transport compound were generated. I observed.

Examples 2 to 8 Other than using the fluorene compound of the other compound example instead of the fluorene compound of the compound example 13 used in Example 1,
Electrophotographic photoreceptors corresponding to Examples 2 to 8 were prepared in the same manner as in Example 1. The electrophotographic characteristics, transfer memory, cracks in the photosensitive layer and crystallization of the charge transport compound of each photoreceptor were evaluated by the same method as in Example 1. The results are shown in Tables 8 and 9.

Comparative Examples 1 to 5 Comparative Examples 1 to 5 were performed in the same manner as in Example 1 except that the compounds A to E represented by the following structural formulas were used instead of the fluorene compound of Compound Example 13 used in Example 1. An electrophotographic photosensitive member corresponding to No. 5 was prepared. The electrophotographic characteristics, transfer memory, cracks in the photosensitive layer and crystallization of the charge transport compound of each photoreceptor were evaluated by the same method as in Example 1. The results are shown in Tables 8 and 9. Compound A

[Chemical 3] Compound B

[Chemical 4] Compound C

[Chemical 5] Compound D

[Chemical 6] Compound E

[Chemical 7]

[0038]

[Table 8]

[Table 9]

Example 9 2.5 g of a disazo pigment having the following structural formula was added to 2.5 g of a butyral resin (degree of butyralization: 63 mol%) to cyclohexanone 9:
A coating solution was prepared by dispersing the solution dissolved in 0 ml with a sand mill for 16 hours.

[Chemical 8]

This coating solution was applied onto an aluminum sheet with a Mayer bar so that the film thickness after drying was 0.1 μm, to form a charge generation layer.

Next, 9 g of the fluorene compound of Compound Example 2 as a charge transport material and 12.0 g of polycarbonate (weight average molecular weight of 35,000) were dissolved in 70 g of chlorobenzene, and this solution was used as the charge generation layer. After coating with a Mayer bar and drying, a charge transport layer having a film thickness of 18 μm was formed to prepare an electrophotographic photoreceptor.

The produced electrophotographic photosensitive member was corona-charged at -5 KV by a static method using an electrostatic copying paper tester (trade name: Model SP-428, manufactured by Kawaguchi Denki Co., Ltd.) and kept in the dark for 1 second. After that, exposure was carried out with an illuminance of 20 lux and the charging characteristics were measured. As the charging characteristics, the surface potential V ₀ and the potential V ₁ when dark-decayed for 1 second are 1/5.
The amount of exposure (E1 / 5) required to attenuate the light was measured.

Further, in order to measure the fluctuations in the light potential and the dark potential when repeatedly used, the prepared electrophotographic photoconductor was used as a photoconductor of a PPC copying machine (trade name NP-3825, manufactured by Canon Inc.). drum cylinder - affixed to perform 5,000 sheet copying in the aircraft, measured variation △ V _D of the initial and 5,000 sheets variation of light-area potential V _L after copying △ V _L and the dark potential V _D did. The initial V _D and V _L were set to -700V and -200V, respectively. Also,
A test for promoting cracking of the photosensitive layer and crystallization of the charge transport compound was conducted in the same manner as in Example 1. The results are shown in Tables 10 and 11.

Examples 10 to 13 Examples 10 to 13 were carried out in the same manner as in Example 9 except that the fluorene compound of Example 2 was used instead of the fluorene compound of Example 2 of compound used in Example 9. A corresponding electrophotographic photoreceptor was prepared. The electrophotographic characteristics, transfer memory, cracks in the photosensitive layer and crystallization of the charge transport compound of each photoreceptor were evaluated by the same method as in Example 1. The results are shown in Tables 10 and 11.

Comparative Examples 6 to 10 Corresponding to Comparative Examples 6 to 10 in the same manner as in Example 9 except that the compounds A to E were used instead of the fluorene compound of Compound Example 2 used in Example 9. An electrophotographic photoreceptor was created. The electrophotographic characteristics, transfer memory, cracks in the photosensitive layer and crystallization of the charge transport compound of each photoreceptor were evaluated by the same method as in Example 1. The results are shown in Tables 10 and 1.
Shown in 1.

[Table 10]

[Table 11]

Example 14 4- (4-Dimethylaminophenol) -2,6-diphenylthiapyrylium perchlorate (4 g) and Compound Example 4
6 g of the fluorene compound of 5 was mixed with 90 g of a toluene (40 parts by weight) -dioxane (60 parts by weight) solution of a copolyester (weight average molecular weight of 38,000), and the mixture was dispersed by a ball mill for 48 hours. This dispersion was applied on an aluminum sheet with a Mayer bar and dried at 120 ° C. for 1 hour.
An electrophotographic photoreceptor was prepared by forming a photosensitive layer having a thickness of μm.

The initial characteristics of the electrophotographic photosensitive member thus prepared were measured by the same method as in Example 9 to obtain V ₀ : -702V,
_{V 1: -695, E1 / 5} : was 3.8 lux-seconds. Further, when a test for promoting cracking of the photosensitive layer and crystallization of the charge-transporting substance was conducted in the same manner as in Example 1, no crack was observed even after 4 hours, and no crystallization was observed even after 4 days. It was

[0048]

EFFECT OF THE INVENTION The electrophotographic photoreceptor of the present invention contains a fluorene compound having a specific structure in the photosensitive layer, so that high sensitivity, repetitive charging, and continuous image formation by exposure can be achieved.
It is said that the fluctuation of the light potential and the dark potential is small, the durability is excellent, the transfer memory is very small even in the reversal development system, and the crack of the photosensitive layer causing the image defect and the crystallization of the charge transport compound are extremely unlikely to occur. Notable effects are exhibited, and similar effects are also exhibited in an electrophotographic apparatus and a facsimile equipped with the electrophotographic photosensitive member.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a general transfer type electrophotographic apparatus.

FIG. 2 is a block diagram of a facsimile using the electrophotographic apparatus as a printer.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Drum type photoconductor as an image carrier (electrophotographic photoconductor of the present invention) 2 Corona charging device 3 Exposure part 4 Developing means 5 Transfer means 6 Cleaning means 7 Pre-exposure means 8 Image fixing means L Optical image exposure P Transfer material having received image transfer 9 Image reading unit 10 Controller 11 Receiver circuit 12 Transmitter circuit 13 Telephone 14 Line 15 Image memory 16 CPU 17 Printer controller 18 Printer-

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tetsuro Kanamaru 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc.

Claims (3)

[Claims] 1. An electrophotographic photoreceptor having a photosensitive layer containing a fluorene compound represented by the following general formula (1). General formula (1) In the formula, R ₁ represents a hydrogen atom, a halogen atom, an optionally substituted alkyl group, an aralkyl group, an amino group, an alkoxy group or a hydroxyl group, and Ar ₁ and Ar ₂ may have a substituent. Represents an aromatic ring group or a heterocyclic group, n is 2
It is an integer of -10. 2. An electrophotographic apparatus provided with the electrophotographic photosensitive member according to claim 1. 3. A facsimile having an electrophotographic apparatus equipped with the electrophotographic photosensitive member according to claim 1 and means for receiving image information from a remote terminal.