Organic photosensitive drum for electro-photography and manufacturing method therefor

Abstract

Disclosed is a method for manufacturing an organic photosensitive drum for electrophotography, which includes a step of immersing a hollow cylinder into a liquefied photosensitive material after gripping the hollow cylinder, by using a coating device including: a transfer tray in which the hollow cylinder is inserted and loaded into at least one jig vertically provided on a plate type pallet; and a gripping assembly disposed above the transfer tray and including at least one gripping mechanism. The process of gripping the hollow cylinder includes: inserting a portion or the whole of the gripping mechanism into the hollow cylinder; aligning a lower end of the gripping mechanism with a lower end of the hollow cylinder; and gripping the hollow cylinder by using the gripping mechanism.

Claims

1. A method for manufacturing an organic photosensitive drum for electrophotography, comprising: inserting a gripping mechanism into a hollow cylinder when a lower end of the hollow cylinder is secured by a jig; releasing the lower end of the hollow cylinder from the jig when the gripping mechanism is inserted into the hollow cylinder; aligning a distal end of the gripping mechanism with a distal end of the lower end of the hollow cylinder when the lower end of the hollow cylinder is released from the jig and the jig is located outside the hollow cylinder; gripping, by the gripping mechanism, the lower end of the hollow cylinder while the distal end of the gripping mechanism is aligned with the distal end of the lower end of the hollow cylinder when the lower end of the hollow cylinder is released from the jig and the jig is located outside the hollow cylinder; and dipping the hollow cylinder into a liquefied photosensitive material from the lower end of the hollow cylinder by the gripping mechanism gripping the lower end of the hollow cylinder.

2. The method of claim 1, further comprising: intermediate-gripping the hollow cylinder by using the gripping mechanism when the gripping mechanism is inserted into the hollow cylinder and the lower end of the hollow cylinder is secured by the jig; lifting the gripping mechanism to release the hollow cylinder from the jig; and releasing the hollow cylinder from the gripping mechanism in a state in which the distal end of the lower end of the hollow cylinder is supported, wherein the aligning the distal end of the gripping mechanism with the distal end of the lower end of the hollow cylinder is performed after the releasing the hollow cylinder from the gripping mechanism to grip the lower end of the hollow cylinder.

3. The method of claim 2, wherein in the releasing the hollow cylinder from the gripping mechanism, the distal end of the lower end of the hollow cylinder is supported on a plate type pallet or by using a separate plate type member.

4. The method of claim 1, wherein the gripping mechanism uses a contractible and expandable elastic member.

5. The method of claim 4, wherein the gripping mechanism is an air picker or an o-ring compression picker.

6. A method for manufacturing an organic photosensitive drum for electrophotography, comprising: inserting a gripping mechanism into a hollow cylinder when a lower end of the hollow cylinder is secured by a jig; releasing the lower end of the hollow cylinder from the jig when the gripping mechanism is inserted into the hollow cylinder; aligning a distal end of the gripping mechanism with the lower end of the hollow cylinder when the lower end of the hollow cylinder is released from the jig; gripping, by the gripping mechanism, the lower end of the hollow cylinder when the lower end of the hollow cylinder is released from the jig; and dipping the hollow cylinder into a liquefied photosensitive material from the lower end of the hollow cylinder by the gripping mechanism gripping the lower end of the hollow cylinder, wherein the releasing the lower end of the hollow cylinder from the jig includes: placing a support plate, having a jig hole through which the jig passes, to support the lower end of the hollow cylinder; and lifting the support plate along the jig up to a position that the lower end of the hollow cylinder is released from the jig.

7. A method for manufacturing an organic photosensitive drum for electrophotography, comprising: inserting a gripping mechanism into a hollow cylinder when a lower end of the hollow cylinder is secured by a jig; releasing the lower end of the hollow cylinder from the jig when the gripping mechanism is inserted into the hollow cylinder; aligning a distal end of the gripping mechanism with the lower end of the hollow cylinder when the lower end of the hollow cylinder is released from the jig; gripping, by the gripping mechanism, the lower end of the hollow cylinder when the lower end of the hollow cylinder is released from the jig; and dipping the hollow cylinder into a liquefied photosensitive material from the lower end of the hollow cylinder by the gripping mechanism gripping the lower end of the hollow cylinder, wherein the releasing the lower end of the hollow cylinder from the jig includes: placing a lifting member under a plate on which the jig is placed and having a through hole formed at a vicinity of the jig; lifting the lifting member along the jig through the through hole to lift the hollow cylinder up to a position that the lower end of the hollow cylinder is released from the jig.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a process conceptual view illustrating an immersion coating method of a photosensitive material with respect to a conventional hollow cylinder.

(2) FIG. 2 is another process conceptual view illustrating an immersion coating method of a photosensitive material with respect to a conventional hollow cylinder.

(3) FIG. 3 is a process conceptual view illustrating an immersion coating method of a photosensitive material with respect to a hollow cylinder according to a first embodiment of the present invention.

(4) FIG. 4 is an enlarged cross-sectional view illustrating a gripping mechanism and a transfer tray according to the first embodiment.

(5) FIG. 5 is a process conceptual view illustrating an immersion coating method of a photosensitive material with respect to a hollow cylinder according to a second embodiment of the present invention.

(6) FIG. 6 is a process conceptual view illustrating an immersion coating method of a photosensitive material with respect to a hollow cylinder according to a third embodiment of the present invention.

(7) FIG. 7 is a plan view illustrating a transfer tray according to the third embodiment of FIG. 6.

MODE FOR CARRYING OUT THE INVENTION

(8) Hereinafter, embodiments according the present invention will be described with reference to the accompanying drawing. Like reference numerals are used for referring to the same or similar elements in the description and drawings. Furthermore, when it is described that one comprises (or includes or has) some elements, it should be understood that it may comprise (or include or has) only those elements, or it may comprise (or include or have) other elements as well as those elements if there is no specific limitation.

(9) Meanwhile, hereinafter, a hollow cylinder represents a structure in a process before a photosensitive material is applied, and a photosensitive drum or photosensitive drum cylinder represents a structure in a state in which the photosensitive material is applied to the hollow cylinder. Thus, they need to be separately described.

(10) FIG. 3 is a process concept view illustrating a method for applying the photosensitive material to a hollow cylinder according to a first embodiment of the present invention, and FIG. 4 is an enlarged cross-sectional view illustrating a gripping mechanism and a transfer tray according to the first embodiment.

(11) The applying of the photosensitive material to the hollow cylinder is performed by a coating device 10 including a transfer tray 200 including at least one jig 220 fixed to a top surface of a plate type pallet 210 and a gripping assembly 100 including a plurality of gripping mechanisms 120 provided on a bottom surface of a base plate 110. Here, the number of the plurality of gripping mechanisms 120 corresponds to that of the jig 220.

(12) The transfer tray 200 is transferred toward a lower portion of the gripping assembly 100 to perform a coating process in a state in which a hollow cylinder 20 is inserted and loaded into the jig 220 by a transfer unit (not shown) such as a conveyor. The plate type pallet 210 of the transfer tray 200 may be aligned to an exact position on an elevating movement path of the gripping assembly 100 by a separate alignment mechanism (not shown) fixed around the transfer unit such as the conveyor.

(13) The gripping assembly 100 may be disposed above the moving path of the transfer unit, elevate to the transfer tray 200 transferred to grip the hollow cylinder 20, and horizontally move and elevate to a photosensitive solution accommodation container (not shown) that is separately provided while gripping the hollow cylinder 20.

(14) The gripping mechanism 120 includes a hollow rod 126 fixed to a bottom surface of the base plate 110 and an air picker 122 coupled to an end of the hollow rod 126.

(15) An elastic member 123 contracted/expanded on the basis of introduction/discharge of fluid (air) controlled through a solenoid valve is provided on an end of the air picker 122. When the fluid is introduced, the elastic member 123 expands to be closely attached to an inner wall surface of the hollow cylinder 20 and grip the hollow cylinder 20, and when the fluid is discharged, the elastic member 123 is contracted to release the closely attached state with the hollow cylinder 20.

(16) Selectively, an entry guide 124 of which an end is tapered may be provided on the end of the air picker 122 for easy entry into the hollow cylinder 20.

(17) Meanwhile, according to embodiments in FIGS. 3 and 4, although the air picker 122 is exemplarily illustrated as the gripping mechanism, other gripping mechanisms such as O-ring compression picker, which may grip the hollow cylinder 20 through contacting the expanded elastic member to the inner surface of the hollow cylinder 20 and intentionally control the gripping process, are possibly used.

(18) An immersion coating process of a photosensitive material according to the present invention is basically performed such that the hollow cylinder 20 is gripped by the gripping mechanism 120, and then immersed into the liquefied photosensitive material.

(19) Unlike a conventional method in which in the process of gripping the hollow cylinder 20, the gripping mechanism 120 is inserted into only a portion of an upper side in the cylinder 20 to grip the cylinder 20 in a state in which entry is limited by an entry limit position provided on an upper end of the jig inserted into the cylinder 20, the present invention further include a process of aligning the gripping mechanism 120 to a lower end of the hollow cylinder 20 before final gripping.

(20) Referring to FIG. 3, the above-described inserting, aligning, and gripping will be described in detail.

(21) Firstly, the gripping assembly 100 is lowered to the transfer tray 200 aligned thereto to insert the gripping mechanism 120 to be spaced by a predetermined distance from an upper end of the jig 220 disposed in the hollow cylinder 20 (steps of (a) and (b) in FIG. 3).

(22) Continuously, the elastic member 123 disposed on the end of the air picker 122 of the gripping mechanism 120 is expanded to grip an intermediate portion of the hollow cylinder 20 in a state in which lower end alignment is not performed between the gripping mechanism 120 and the hollow cylinder 20, and then the gripping assembly 100 including the gripping mechanism 120 is lifted to carry out the jig 220 from the hollow cylinder 20 (step (c) in FIG. 3).

(23) Thereafter, the gripping assembly 100 horizontally moves, then is lowered onto the plate type pallet 210 of the transfer tray 200 so that the lower end of the hollow cylinder 20 is supported, and then the expansion state of the elastic member 123 is relaxed to be released (steps (d) and (e) in FIG. 3). In this case, the lower end of the hollow cylinder 20 may be supported by using the plate type pallet 210 of the transfer tray 200 like the above-described embodiment or on a separate plate type member (not shown).

(24) Thereafter, the gripping assembly 100 is further lowered to align a lower end of the gripping mechanism to the lower end of the hollow cylinder 20 (step (f) in FIG. 3).

(25) Thereafter, the elastic member 123 expands to grip the hollow cylinder 20, and then the gripping assembly 100 is moved to a place in which the photosensitive solution is accommodated to complete the gripping process (step (g) in FIG. 3).

(26) Through the lower end alignment of the gripping mechanism 120 with respect to the hollow cylinder 20 before gripping, in the gripping state, a space formed between a surface of a lower portion of the gripping mechanism 120 and the inner wall surface of the hollow cylinder 20 in a lower side of the hollow cylinder 20 may be minimized. Accordingly, since an inner space of the hollow cylinder 20 is directly reached to a saturation state by solvent vapor in the immersion coating process, solvent evaporation in a liquid surface formed to the lower end of the hollow cylinder 20 may be restrained, and bubble discharge from an inside of the hollow cylinder 20 may be prevented to use solvent having a rapid evaporation speed in preparing the photosensitive solution although the photosensitive solution is not introduced into the hollow cylinder 20 like the related art. As a result, uniformity in the coating amount of the photosensitive layer may be secured, and thus the photosensitive material applied to the inner wall surface of the hollow cylinder 20 may be restrained to reduce a preparing cost.

(27) Meanwhile, although the lower end alignment of the gripping mechanism 120 with respect to the hollow cylinder 20 according to an embodiment in FIG. 3 may be simply accomplished by controlling only operation of the gripping assembly 100 and the gripping mechanism 120 in a state an existing facilities is used as it is in a method performed through the elevating and horizontal movement operation of the gripping assembly 100 and the gripping the intermediate portion and releasing process of the gripping mechanism 120, it is not the best method in terms of process efficiency because the number of a unit process for alignment increases and a processing time is retarded.

(28) FIG. 5 is a process conceptual view illustrating a method of applying the photosensitive material to the hollow cylinder according to a second embodiment of the present invention. FIG. 5 illustrates an embodiment in which the process efficiency in the lower end alignment process of the gripping mechanism 120 with respect to the hollow cylinder 20 is improved in comparison with that of the first embodiment.

(29) According to the second embodiment, the constitution and operation of the gripping assembly 100 may be the same as those according to the first embodiment of FIG. 3, the transfer tray 200 may include at least one jig 220 fixed to the top surface of the plate type pallet 210 like the first embodiment in FIG. 3 and be transferred below the gripping assembly 100 by the transfer unit (not shown) such as a conveyor to perform the coating process in a state the hollow cylinder 20 is inserted and loaded into the jig 220, and the plate type pallet 210 of the transfer tray 200 may be aligned to the exact position on the elevating movement path of the gripping assembly 100 by the separate alignment mechanism (not shown) fixedly installed around the transfer unit such as the conveyor.

(30) Meanwhile, according to the second embodiment, to perform the lower end alignment process of the gripping mechanism 120 with respect to the hollow cylinder 20, the transfer tray 200 further includes a support plate 230 installed on the top surface of the plate type pallet 210 and including a jig entry hole 234 through which the jig 220 passes to be mounted vertically slidable along the jig 220 between the top surfaced of the plate type pallet 210 and the upper end of the jig 220. In this case, a size and shape of a cross-section of the jig entry hole 234 is determined in an appropriate shape and range in which the jig 220 passes and the hollow cylinder 20 does not pass.

(31) To align the support plate 230 to a fixed position on the plate type pallet 210, a position alignment pin 212 may be formed on the top surface of the plate type pallet 210, and, in correspondence thereto, a position alignment hole 232 coupled to the position alignment pin 212 may be formed in the support plate 230.

(32) The support plate 230 vertically moves by an elevating mechanism 260 provided on a lower portion of a conveyor transfer unit (not shown). The elevating mechanism 260 includes a plurality of elevating pins 262 for supporting the support plate 230 and a driving unit such as an electric motor or a pneumatic cylinder 264 for elevating the plurality of elevating pins 262. A coupling hole 233 coupled to an end of the elevating pin 262 is provided to the support plate 230, and an elevating pin entry hole 214 through which the elevating pin 262 passes is defined in the plate type pallet 230.

(33) In a gripping process with respect to the hollow cylinder 20 according to the second embodiment, like the first embodiment, the gripping assembly 100 is firstly lowered to the transfer tray 200 aligned thereto to insert the gripping mechanism 120 into the hollow cylinder 20 until the upper end of the jig 220 disposed therein (steps (a) and (b) in FIG. 5).

(34) Thereafter, as the elevating pin 262 is lifted through the elevating pin entry hole 214 of the plate type pallet 230 by using the pneumatic cylinder 264, the support plate 230 coupled to the elevating pin 262 by the coupling hole 233 is guided by the jig 220 through the jig entry hole 234 and lifted until the upper end of the jig 220, thereby supporting the lower end of the hollow cylinder 20 (step (c) in FIG. 5).

(35) Thereafter, like the first embodiment, the elastic member 123 is expanded to grip the hollow cylinder 20, and then the gripping assembly 100 is moved to a place in which the photosensitive solution is accommodated to complete the gripping process (step (d) in FIG. 5).

(36) In the second embodiment in FIG. 5, the lower end alignment process of the gripping mechanism 120 with respect to the hollow cylinder 20 may be realized by only the lifting operation of the support plate 230 separately provided to the transfer tray 200 to simplify an entire process in comparison with that in first embodiment.

(37) FIG. 6 is a process conceptual view illustrating a photosensitive material immersion coating method of the hollow cylinder according to a third embodiment, and FIG. 7 is a plan view of a transfer tray according to the third embodiment in FIG. 6. The third embodiment in FIGS. 6 and 7 is an embodiment in which as a modified example of the second embodiment, process efficiency in the lower end alignment process of the gripping mechanism 120 with respect to the hollow cylinder 20 is improved in comparison to that in the first embodiment.

(38) According to the third embodiment, the constitution and operation of the gripping assembly 100 may be the same as those according to the first and second embodiments, the transfer tray 200 may include at least one jig 220 fixed to the top surface of the plate type pallet 210 like the first and second embodiments and be transferred below the gripping assembly 100 by the transfer unit (not shown) such as a conveyor to perform the coating process in a state the hollow cylinder 20 is inserted and loaded into the jig 220, and the plate type pallet 210 of the transfer tray 200 may be aligned to the exact position on the elevating movement path of the gripping assembly 100 by the separate alignment mechanism (not shown) fixedly installed around the transfer unit such as the conveyor.

(39) Meanwhile, in the third embodiment, to perform the lower end alignment process of the gripping mechanism 120 with respect to the hollow cylinder 20, the coating device 10 further includes a cylinder lifting mechanism 300 including a lifting member 310 and a driving unit 320 for lifting the lifting member. The driving unit 320 may be realized as a shape of an electric motor or a pneumatic cylinder. Also, referring to FIG. 7, at least one lifting member entry hole 216 formed around the jig 220 and exposing a portion of the lower end of the hollow cylinder 20 installed in the jig is formed in the plate type pallet 210.

(40) In a gripping process of the hollow cylinder 20 according to the third embodiment, like the second embodiment, the gripping assembly 100 is firstly lowers to the transfer tray 200 aligned thereto to insert the gripping mechanism 120 into the hollow cylinder 20 until the upper end of the jig 220 disposed therein (steps (a) and (b) in FIG. 6)

(41) Thereafter, the lifting member 310 supports the lower end of the hollow cylinder 20 in the process in which the lifting member passes through the lifting member entry hole 216 and is lifted until the upper end of the jig 220 by the driving unit 320 (step (c) in FIG. 6).

(42) Thereafter, like the second embodiment, the elastic member 123 is expanded to grip the hollow cylinder 20, and then the gripping assembly 100 is moved to a place in which the photosensitive solution is accommodated to complete the gripping process (step (d) in FIG. 6).

(43) The lower end alignment process of the gripping mechanism 120 with respect to the hollow cylinder 20 according to the third embodiment in FIGS. 6 and 7 may be realized by only the lifting operation of the cylinder lifting mechanism 300 additionally provided to the coating device 10 to simplify the entire process in comparison with that of the first embodiment and simplify the structure of the transfer tray 200 in comparison with that of the second embodiment.

Embodiment 1

(44) The aluminum hollow cylinder having an external diameter of 30 mm, an internal diameter of 28.5 mm, and a length of 357 mm is mirror-surface finished, and a lower end thereof is gripped while spaced apart by a distance of 5 mm from a lower end of an air picker, and then a surface thereof is coated with a lower coating layer coating solution prepared by mixing 70 parts by weight of polyamide resin (CM8000, Toray Inc.) and 930 parts by weight of methanol. The lower coating layer coating solution is applied to an outer surface of the aluminum hollow cylinder by using an immersion coating method to form a lower coating layer having a film thickness after drying of approximately 0.5 m.

(45) The lower end of the half-finished photosensitive drum having the lower coating layer is gripped while spaced apart by a distance of 5 mm from the lower end of the air picker, and then a solution prepared such that, as an electric charge generation layer, 3 parts by weight of polyvinyl butyral resin (BX-1, Sekisui Inc.) is dissolved in 94 parts by weight of tetrahydrofuran, and 3 parts by weight of Y-oxy titanium phthalocyanine (TPL-3, Orient Inc.) pigment is diffused is applied and the electric charge generation layer having a film thickness after drying of approximately 0.2 m is formed.

(46) The lower end of the above-described prepared half-finished photosensitive drum is gripped while spaced apart by a distance of 5 mm from the lower end of the air picker, and lowered into a photosensitive solution for an electric charge transport layer, in which at a speed of 10 mm/sec and then stopped for 1 second to stabilize the photosensitive solution, lifted again at a speed of 5 mm/sec to apply the photosensitive solution for the electric charge transport layer. Here, the photosensitive solution for an electric charge transport layer is prepared such that 50 parts by weight of hydrazone (CTC-191, Takasago Inc.), 50 parts by weight of butadiene (T-405, Takasago Inc.), 100 parts by weight of polycarbonate (PCZ-400, Mitsubishi Gas Chemical Inc.), 1 part by weight of silicone oil (KF-340, Shin-Etsu Chemical Inc.), and 800 parts by weight of tetrahydrofuran are stirred together and dissolved. Thereafter, the half-finished photosensitive drum is dried in a drying furnace at 130 C. for 40 minutes to form the electric charge transport layer, and thus manufacture the photosensitive drum. The thickness of the electric charge transport layer is measured by positions of the photosensitive drum respectively spaced apart by 30 mm, 130 mm, 230 mm, and 330 mm from the upper portion thereof. The thickness at each of the positions is measured by using a thickness gauge (model number DCN-900, Check-Line Inc.) to measure 5 spots along a circumferential direction of the photosensitive drum, and a mean value thereof is determined as a thickness at the corresponding position.

Embodiment 2

(47) A photosensitive drum is manufactured in the same method as that of the embodiment 1 except the 800 parts by weight of tetrahydrofuran is replaced by a mixed solvent in which 720 parts by weight of methylene chloride and 80 parts by weight of toluene are mixed when the photosensitive solution for the electric charge transport is prepared, and then the thickness of the electric charge transport layer is measured.

Embodiment 3

(48) A photosensitive drum is manufactured in the same method as that of the embodiment 1 except the 800 parts by weight of tetrahydrofuran is replaced by a mixed solvent in which 400 parts by weight of methylene chloride and 400 parts by weight of 1,2-dichloroethane are mixed when the photosensitive solution for the electric charge transport is prepared, and then the thickness of the electric charge transport layer is measured.

Comparative Example 1

(49) A photosensitive drum is manufactured in the same method as that of the embodiment 1 except, as a gripping condition of the air picker, only the distance between the lower end of the hollow cylinder and the lower end of the air picker is changed to 100 mm, and then the thickness of the electric charge transport layer is measured.

Comparative Example 2

(50) A photosensitive drum is manufactured in the same method as that of the embodiment 1 except the 800 parts by weight of tetrahydrofuran is replaced by 800 parts by weight of toluene when the photosensitive solution for the electric charge transport is prepared, and then the thickness of the electric charge transport layer is measured.

Comparative Example 3

(51) A photosensitive drum is manufactured in the same method as that of the embodiment 1 except the 800 parts by weight of tetrahydrofuran is replaced by a mixed solvent in which 400 parts by weight of 1,2-dichloroethane and 400 parts by weight of monochlorobenzene are mixed when the photosensitive solution for the electric charge transport is prepared, and then the thickness of the electric charge transport layer is measured.

Comparative Example 4

(52) A photosensitive drum is manufactured in the same method as that of the embodiment 1 except the photosensitive solution is introduced up to 50 mm from the inner lower end in the hollow cylinder when the hollow cylinder is lowered to be immersed into the photosensitive solution, and then the thickness of the electric charge transport layer is measured.

(53) Results measured on the basis of the above-described embodiments 1 to 3 and comparative examples 1 to 4 are summarized in table 1 below.

(54) TABLE-US-00001 TABLE 1 Comparative Comparative Comparative Comparative Measurement item Embodiment 1 Embodiment 2 Embodiment 3 example 1 example 2 example 3 example 4 Evaporation speed of 2.3 2.23 2.25 2.3 6.1 6.35 2.3 photosensitive solution Bubble discharge No No No Occurrence No No No Coated inner surface No No No No No No Coating Thickness 30 mm 24 m 24 m 25 m Coating 23 m 22 m 25 m of coated 130 mm 25 m 24 m 25 m defect 24 m 23 m 25 m film 230 mm 25 m 25 m 25 m generated 25 m 24 m 25 m 330 mm 25 m 25 m 24 m due to 28 m 26 m 24 m Deviation 1 m 1 m 1 m bubble 5 m 4 m 1 m

(55) As described above, to solve a gripping failure problem, as a state in which the movement of the hollow cylinder is restricted by the jig of the transfer tray in a process in which the fixed gripping mechanism is entered into the hollow cylinder is resolved, as a result, the center of the hollow cylinder may be freely moved to the position of the gripping mechanism to accomplish the purpose of gripping failure problem improvement.

(56) Also, since the empty space formed by the lower surface of the gripping mechanism 120, the inner wall surface of the hollow cylinder 20, and the surface of the photosensitive solution 30 in the lower inner side of the hollow cylinder 20 in the gripped state needs to be minimized to reduce the manufacturing cost and improve quality of the formed layer, the above-described purpose is sufficiently accomplished by the lower end alignment process of the gripping mechanism 120 with respect to the hollow cylinder 20 according to the first, second, and third embodiments.

(57) Also, the method for manufacturing the organic photosensitive drum according to the present invention may apply the photosensitive solution on only the outer surface of the hollow cylinder even in case of using the quick drying photosensitive solution containing the single or mixed solvent having the mean relative evaporation speed of 1.9 to 5 when the ether has the evaporation speed of 1 to decrease deviation of the coating amount of the photosensitive layer to minimize the runout tolerance problem after the gear or the bearing member is assembled, which may occur during the coating of the inner surface, thereby providing the photosensitive drum cylinder capable of acquiring further excellent image quality.

(58) Meanwhile, in the organic photosensitive drum for electrophotography manufactured according to the present invention, the photosensitive material layer applied on the hollow cylinder may be formed by at least one layer, and in this case, at least one layer of the photosensitive material layers may be prepared by the photosensitive solution containing the single or mixed solvent having the relative evaporation speed of 1.9 to 5 with respect to ether, thereby being applied on only the outer surface of the hollow cylinder.