JPH05107921A - One-component developing device - Google Patents

Abstract

PURPOSE:To obtain a one-component developing device capable of keeping the quantity of developer in a developer storing chamber nearly constant even when the device is miniaturized and stably forming an excellent image. CONSTITUTION:A feeding and supplying member 5 having plural apertures on the peripheral surface of a cylindrical member, a light emitting device 7 which emits light toward the peripheral surface of the member 5, and a photodetector device 8 for detecting the light which passes inside the member 5 from one of the apertures and is emitted from another aperture are provided in a housing 4 where the developer is stored. The developer is supplied in the housing 4 from a developer storing box 11 by a developer feeding device 9, and a control means 10 controls to drive the developer feeding device based on the received light quantity detected by the device 8. Since the received light quantity by the device 8 is changed according to the quantity of the developer inside the member 5, the quantity of the developer in the housing is controlled to be constant.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a developing device for visualizing an electrostatic latent image formed by an electrophotographic method by adhering a developer thereto, and more particularly to a developing device using a one-component developer as the developer. .

[0002]

2. Description of the Related Art Conventionally, as a developing device using a one-component developer, a developer carrier capable of adsorbing and transporting the developer on its surface, and a developer regulating the amount of the developer on the developer carrier. A regulating member, a developer accommodating chamber for accommodating the developer,
A developer supply member that supplies a developer from a developer storage chamber to a developer carrier is known. In such a developing device, the developer supplied from the developer accommodating chamber to the developer carrying member is regulated by the developer regulating member to be a uniform thin layer and is also provided with an electric charge. The electrostatic latent image holding member is conveyed to a developing area which closely faces and opposes. In the developing area, the developer on the developer carrier adheres to the electrostatic latent image on the electrostatic latent image holder to be visualized.

A color copying machine or the like has three or four developing devices as described above, and it is necessary to downsize the developing device. Therefore, a mechanism is often used in which the size of the developer accommodating chamber is minimized and the developer is appropriately supplied from the developer storage box provided outside the developing device by the developer conveying device. In such a mechanism, the drive of the developer transporting device must be controlled so that the amount of developer in the developer storage chamber is always substantially constant. That is, if the amount of developer consumed by the developing device is larger than the amount of developer supplied by the developer transport device, the amount of developer in the developer accommodating chamber gradually decreases, causing a partial decrease in density and image defects. If the amount of developer consumed by the developing device is less than the amount of developer supplied by the developer transport device, the amount of developer in the developer accommodating chamber will gradually increase, and the developer in the developer accommodating chamber will be fixed or the developer will not adhere. The developer jams in the transport device.

In order to control the drive of such a developer transport device, it is necessary to detect the amount of the developer in the developer accommodating chamber, which means is disclosed, for example, in JP-A-61-109082. No. 61-77070. Japanese Unexamined Patent Publication No. 61-109082 discloses a device for detecting a drive current of a motor for driving a developer carrier and detecting the amount of developer in the developer accommodating chamber based on the current value. The developer transport device is controlled based on the developer amount detected by so as to keep the developer amount in the developer accommodating chamber substantially constant. JP-A-6
The recording apparatus disclosed in Japanese Patent Laid-Open No. 1-77070 has means for integrating the black level period of the image signal, and monitors the consumption state of the developer from the integrated value.

[0005]

However, the above-mentioned device has the following problems. JP 61-
The developer amount detecting device disclosed in Japanese Patent No. 109082 detects the amount of the developer in the developer accommodating chamber by the load of the motor that drives the developer carrying member. The agent dissipation preventing member and other members are in contact with each other, and in this case, most of the load on the motor is due to the contact friction. For this reason, it becomes difficult to detect the load variation due to the developer amount in the developer accommodating chamber separately from the variation due to other factors, and it is impossible to accurately detect the developer amount.

Further, in the recording apparatus disclosed in Japanese Patent Laid-Open No. 61-77070, the consumption amount of the developer is monitored only from the value obtained by integrating the black level period of the image signal, and the charge amount of the developer is monitored. It is impossible to detect the fluctuation of the developer consumption amount due to the variation of the latent image potential on the electrostatic latent image holding member or the electrostatic latent image holding member, and the error becomes large. A piezoelectric sensor has been generally used as a device for detecting the amount of developer, but when the developer storage chamber is downsized, the contact pressure of the developer becomes small and cannot be detected. If the size is reduced, the amount of developer cannot be accurately detected.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a downsized developing device, which accurately detects the amount of the developer in the developer accommodating chamber and performs the development. An object of the present invention is to obtain a one-component developing device capable of stably forming a good image while keeping the amount of developer stored in the agent storage chamber substantially constant.

[0008]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention is arranged so as to face an electrostatic latent image holding member on the surface of which an electrostatic latent image is formed, A developer carrier capable of adhering and transporting a developer, a developer regulating member that regulates the amount of developer adhering to the surface of the developer carrier, and forms a uniform thin layer of developer; In a one-component developing device having a developer accommodating chamber for storing the developer to be supplied to the agent carrier and a developer conveying device for conveying and supplying the developer from the developer storage box to the developer accommodating chamber, A conveying and supplying member which is composed of a cylindrical member having a plurality of openings on its surface and which is arranged substantially parallel to and close to the developer carrying member and which rotates around the axis of the cylindrical member; and a periphery of the conveying and supplying member. A light emitting device that emits light toward the surface, and a light emitting device that emits light. A light receiving device that detects light emitted from another opening through one of the openings of the conveyance supply member and exits from the other opening, and outputs a signal based on an amount of received light; And a control unit for controlling the drive of the developer transport device based on the signal output from the light receiving device.

Further, in the above one-component developing device,
The conveyance supply member is set so that the rotation thereof is temporarily stopped at a position where the light emitted from the light emitting device passes through the two holes of the conveyance supply member and reaches the light reception device when the amount of received light is detected. Is desirable.

The developer used in the above one-component developing device may be a magnetic one-component developer or a non-magnetic one-component developer. It may also be color toner or capsule toner.

[0011]

In the one-component developing device having the above-mentioned structure, the light emitting device which emits light toward the conveying and supplying member having a plurality of openings on the peripheral surface of the tubular member, and the light emitting device emits the light.
Since a light receiving device for detecting the light passing through the inside of the feeding / supplying member from one of the above-mentioned openings and being emitted from the other opening is provided, the amount of the developer in the feeding / supplying member due to the consumption of the developer. When the developer deposition surface becomes lower than the position where the light emitting device and the light receiving device are provided, the light emitted from the light emitting device passes through the conveyance supply member and is detected by the light receiving device. A signal is output from the light receiving device based on the received light amount, and the control means controls the driving of the developer carrying device based on this signal. Therefore, when the received light amount is large, the developer carrying device is driven. Then, the developer is supplied from the developer storage box into the developer accommodating chamber.

When a sufficient amount of the developer is introduced into the carrying and supplying member by supplying the developer, the amount of the developer deposited near the light emitting device / light receiving device and in the carrying and supplying member increases, and the deposition surface rises. .. Along with this, the light emitted from the light emitting device is blocked by the accumulated developer, cannot pass through the inside of the feeding and supplying member, and is hardly received by the light receiving device. When the amount of received light is small, the drive of the developer transport device is stopped or the developer transport force is controlled to be reduced, and the supply of the developer in the developer accommodating chamber is stopped or reduced.

As described above, since the driving of the developer conveying device is controlled according to the amount of the developer in the developer accommodating chamber, the amount of the developer in the developer accommodating chamber is maintained substantially constant, and the deposition surface thereof receives the light. It is near the installation position of the device and the light receiving device. Further, the cylindrical transporting / supplying member having an opening on the peripheral surface can efficiently transport and supply the developer when the deposition level of the developer is within its cross section. However, the light emitting device and the light receiving device use the transporting / supplying member. The amount of the developer in the developer accommodating chamber is
The carrying and supplying member can be set to an amount most suitable for carrying the developer and supplying the developer to the developer carrying member, so that the developer can be stably carried and supplied to the developer carrying member.

Further, when the amount of received light is detected, the rotation of the carrying / supplying member is temporarily stopped at the position where the light emitted from the light emitting device reaches the light receiving device through the two openings of the carrying / supplying member. By doing so, a stable measurement of the amount of received light can be performed, and the amount of developer in the conveyance supply member can be accurately detected. As a result, the amount of developer in the developer accommodating chamber can be managed more accurately. In this way, by keeping the amount of the developer in the developer accommodating chamber almost constant at all times, the developer can be stably supplied to the developer carrying member, and a good image can be stably formed. It will be possible. In the one-component developing device having the above structure, the light emitting device and the light receiving device are provided at positions facing the peripheral surface of the carrying and supplying member, so that these devices do not hinder the carrying of the developer.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram showing a one-component developing device which is an embodiment of the present invention and uses a non-magnetic developer. In this one-component developing device, a developer carrying member 2 is arranged so as to face the electrostatic latent image holding member 1 on the surface of which an electrostatic latent image is formed, and a developer carrying member 2 to which a developer can be attached and conveyed, and The developer regulating member 3 that regulates the amount of the developer adhered on the developer carrier 2 and forms a uniform thin layer of the developer, and the developer accommodating member 3 that is disposed in parallel with the developer carrier 2 in the vicinity thereof. A carrier supply member 5 that supplies the developer stored in the chamber 6 to the developer carrier 2 is provided.

As shown in FIG. 2, the carrying / supplying member 5 is provided with a plurality of openings 5a on the peripheral surface of a cylindrical member, and is a wall surface of the developer accommodating chamber on both sides of the carrying / supplying member. A light emitting device 7 that emits light toward one of the apertures at a position facing the peripheral surface of the transport supply member, and another aperture that is emitted from the light emitting device 7 and passes through the inside of the tubular member. And a light receiving device 8 for detecting the light emitted from the device. Further, outside the housing 4, the developer transport device 9 for supplying the developer from the external developer storage box 11 to the developer accommodating chamber 6 and the drive of the developer transport device 9 are driven based on the signals output from the light receiving device 8. A CPU (control means) 10 for controlling is provided.

The developer carrying member 2 has a surface on which a developer is attached and can be conveyed by rotating, and a portion close to the electrostatic latent image holding member 1 has a developing area A.
Becomes The developer carrying member 2 has a diameter of about 5 to 40 mm, and after cutting a round bar or pipe of aluminum or stainless steel, a semiconductive layer of phenol resin or the like is provided on the circumferential surface, and emery polishing or the like is performed. After mechanical polishing, Ra = 0.1 to 1.0 μm (desirably Ra =
The surface roughness is about 0.2 to 0.4 μm). Also, after cutting a round bar or pipe of aluminum or stainless steel, the circumferential surface is subjected to mechanical processing such as sand blasting, fluid honing or emery polishing, or chemical corrosion
It may be one having irregularities of about a = 0.1 to 1.0 μm, and it may be used by subjecting an aluminum roll to mechanical polishing and then anodizing. When a semiconductive layer is provided on the peripheral surface, the volume resistance of the surface layer of the developer carrier 2 in the thickness direction is about 10 ⁵ to 10 ¹² Ω · cm.

The developer carrier 2 is usually 100 to 300.
It is set to rotate at about rpm, and the frequency is 1 to 5 KHz (preferably 2.5 to 5 V) at 1000 to 4000 Vpp (peak to peak voltage) between the electrostatic latent image holding member 1 and the electrostatic latent image holding member 1.
An AC bias voltage in which a DC of -50 to -400 V is weighted is applied to the AC of about 4 KHz) by the developing bias power source 13. The voltage of the AC component is preferably set such that the value obtained by dividing Vpeak (peak voltage) by the gap between the developer carrying member 2 and the electrostatic latent image holding member 1 is in the range of 4 to 7 V / μm.

The developer regulating member 3 has a thickness of 0.03 to
Approximately 0.3 mm wide stainless steel leaf spring, width 1
A silicone rubber or EPDM rubber having a thickness of 0 mm and a thickness of about 1 mm and a rubber hardness of 50 ° is vulcanized and adhered, and the contact pressure to the developer carrying member 2 is set to about 20 to 200 g / cm. As a result, the developer adsorbed on the surface of the developer carrier is made into a thin layer of the developer having a thickness of about 5 to 30 μm, and an electric charge of about 2 to 20 μC / g is provided.

The conveying and supplying member 5 has a diameter of 10 to 20.
A cylindrical pipe made of aluminum or stainless steel having a wall thickness of about 1 mm to about 4 mm,
Multiple elliptical or elliptical holes 5 by cutting on the peripheral surface
a is provided. As shown in FIG. 2, the openings 5a are linearly arranged along the axial direction of the transport supply member 5,
Four rows are provided at positions that are distributed at intervals of 90 ° in the circumferential direction. The openings are arranged such that rows of the openings facing each other are arranged at the same pitch, and the openings of the two rows are provided so as to face each other in the direction perpendicular to the axis of the transport supply member 5.

The carrying and supplying member 5 faces the developer carrying member 2 with a gap of about 0.5 to 2.0 mm and rotates at a peripheral surface speed of about 1 to 5 times that of the developer carrying member 2. It is supposed to do. A developer supply bias power source 14 is provided between the conveyance supply member 5 and the developer carrying member 2 so that about 2
A direct current bias voltage of 00 to 1000 V is applied, and the polarity of the transport supply member 5 is the same as that of the developer.

The light emitting device 7 and the light receiving device 8 are arranged on both sides of the two openings facing each other in the vicinity of the axial end portion of the conveying / supplying member 5 and at positions where they can be arranged substantially linearly with the openings. The light receiving device 8 detects the light emitted from the light emitting device 7, passing through the transport supply member 5 through the opening, and exiting through the facing opening.
For the light emitting device 7, for example, an LED having high directivity (GL480 manufactured by Sharp Corporation) can be used, and as the light receiving device 8, for example, a phototransistor (P manufactured by Sharp Corporation) is used.
T481F) and photodiode (PT4 manufactured by Sharp Corporation)
91F) can be used.

The light receiving device 8 is capable of outputting a signal based on the amount of received light, and the CPU 10 to which this signal has been input conveys the developer when the amount of received light is larger than a preset value. The device 9 is controlled so as to be driven for a certain period. The developer transport device 9 is
The developer can be transported from the developer storage box 11 provided outside the developing device, which is driven to rotate by the dispense motor 12, and can be supplied into the developer accommodating chamber 6.

As the electrostatic latent image carrier 1, an organic photoconductor, a Se type photoconductor, etc. are used, and the electrostatic latent image carrier 1 and the developer carrier 2 are used.
Are opposed to each other with a gap of about 100 to 400 μm.
It is desirable that the gap is about 50 to 300 μm. Reference numeral 15 shown in FIG. 1 is a thin plate-like elastic member of about 50 to 500 .mu.m provided in contact with the surface of the conveying / supplying member 5 in order to prevent the filming of the developer. Reference numeral 16 is a member for preventing the dissipation of the developer, and reference numeral 17
Is a power source for applying a bias voltage to the dissipation prevention member. The developer used in such a developing device is a non-magnetic one-component developer, and a polarity control agent such as a pigment such as carbon or a metal-containing azo dye in a thermoplastic resin such as styrene resin, acrylic resin or polyester resin. Is dispersed, pulverized and classified to a size of 5 to 20 μm, and a charge control agent is externally added. As the charge control agent, fine particles of hydrophobized silica, alumina, titanium or the like having a size of 0.1 μm or less are used, and hydrophobic silica is most preferable.

In the one-component developing device as described above, the developer carried into the developer storage chamber 6 from the external developer storage box 11 by the developer carrying device 9 is opened through the opening 5a of the carrying supply member 5. It is introduced into the inside of the carrying and supplying member, and is made uniform in the axial direction of the developer carrier by the rotation of the carrying and supplying member 5. Along with this, the bias power source 14 for supplying the developer
An electric field is generated between the carrier supply member 5 and the developer carrying member 2 by a bias voltage applied from the developer, and this action supplies the developer 1 in the carrier supplying member 5 and in the vicinity of the carrier supplying member 2 to the developer carrier 2. To be done. The developer adhering to the surface of the developer carrying member 2 is thinned and charged by the developer regulating member 3, and the developing area A facing the electrostatic latent image holding member 1 due to the rotation of the developer carrying member 2. Be transported to. Here, an oscillating electric field is generated between the developer carrying member 2 and the electrostatic latent image holding member 1 by the DC superimposed AC voltage applied to the developer carrying member 2, and the developer is the electrostatic latent image holding member. 1 is attached to the electrostatic latent image on and developed.

Although the developer in the developer accommodating chamber 6 is consumed by repeating such a developing process, the light emitting device 7 and the light receiving device 8 are provided on both sides of the transport supply member 5 so as to face each other. The amount of the developer inside and around the transport supply member 5 is small because the transport supply member is set at a position where it may be aligned substantially linearly with the two opposing holes 5a provided on the peripheral surface due to the rotation of the transport supply member. Then, the light emitted from the light emitting device 7 is detected by the light receiving device 8 after passing through the inside of the feeding and supplying member 5 and the opening facing the light emitting device 7.
The light receiving device 8 can output a current value corresponding to the amount of received light as a signal, and the relationship between this current value and the amount of developer in the developer accommodating chamber 6 is as shown in FIG. A signal from the light receiving device 8 is input to the CPU 10, and when the current value is larger than a preset threshold value, the CPU 10 starts the driving of the developer transport device 9 and the developer storage box 11 The developer is carried into the developer storage chamber 6 from. Further, when the amount of the developer inside or around the conveyance supply member 5 increases due to the supply of the developer, the light emitted from the light emitting device 7 is blocked by the developer in the conveyance supply member 5 or in the vicinity thereof, and The output current value becomes less than or equal to the threshold value, and the driving of the developer transport device 9 is stopped. In this way, the drive of the developer transport device 9 is controlled according to the amount of developer inside or around the transport supply member 5, so that the amount of developer in the developer storage chamber 6 is always maintained substantially constant. It

In the case of detecting the amount of the developer in the developer accommodating chamber 6 as described above, the light receiving device 8 can receive the light from the light emitting device 7 in the two opposing feeding and supplying members 5. This is when the aperture and the light emitting device 7 and the light receiving device 8 are arranged on a straight line. Therefore, the amount of received light is measured every time the two openings are arranged in a straight line with the light emitting device 7 and the light receiving device 8 in synchronization with the rotation of the transport supply member 5, or the rotation of the transport supply member 5 is measured. It is possible to adopt a method in which the light amount is continuously measured regardless of the measurement and the average value for a certain fixed time is used as a reference.

Further, after a long time of use, the light emitting portion of the light emitting device 7 and the light receiving portion of the light receiving device 8 are contaminated with the developer, and the light receiving device 8 is in spite of the insufficient amount of the developer in the developer accommodating chamber 6. The amount of received light may also decrease. However, by sufficiently lowering the drive threshold value of the developer transport device 9, the developer is transported even if the amount of received light is small, and the influence of the developer stain on the light emitting portion or the light receiving portion is avoided. If the light emitting portion and the light receiving portion are particularly contaminated with the developer, the feeding and supplying member 5
A member for cleaning the light emitting portion and the light receiving portion may be provided in a part of the above.

In order to confirm the effect of the present invention in the above examples, a long-time development test was conducted. However, even after the development of about 60,000 sheets, the amount of the developer in the developer accommodating chamber was increased. Was kept almost constant, and stability was confirmed. The conditions of the one-component developing device used in this experiment are as shown below. Electrostatic latent image carrier Negatively charged organic photoconductor Process speed 160 mm / sec Developer carrier φ24 mm, 180 rpm Phenolic resin roll (10 ⁶ Ω · cm) Developer supply member φ19 mm, 600 rpm Stainless steel roll (with opening) Developer regulation Material SUS303, 0.12m
1 mm thick EPDM rubber adhered to a leaf spring of m.
The contact pressure is about 120 gf / cm. The distance between the electrostatic latent image carrier and the developer carrier is about 200 μm. Latent image potential −100V Background potential −350V Development bias potential DC −200V to AC 24
00Vpp, 4kHz superimposed Developer supply bias 600V developer Non-magnetic one-component color developer (polyester type)

In the one-component developing device as described above, when the light from the light emitting device 7 is detected by the light receiving device 8,
The amount of the developer in the developer accommodating chamber 6 can be reduced by temporarily stopping the rotation of the transport supply member at a position where the two opposing openings of the transport supply member 5 are arranged substantially linearly with the light emitting device and the light receiving device. Can be measured accurately. That is, the transport supply member 5 is temporarily stopped for each development cycle to measure the amount of the developer in the developer storage chamber, and the drive of the developer transport device 9 is controlled in the next development cycle according to the result. To do. As a method of stopping the rotation of the transport supply member 5 at the position where the two openings are arranged substantially linearly with the light emitting device and the light receiving device, a method of performing pulse control using a stepping motor to drive the transport supply member 5 Can be adopted. Further, as shown in FIG. 4, when the light-shielding plate 41 is attached to the drive shaft of the conveying / supplying member 5 so as to project, and the two opposing holes come to a position where they are substantially linearly arranged with the light emitting device and the light receiving device. It is also possible to use a control method in which the light blocking plate 41 blocks the light from the photo sensor 42 and the control device 43 stops driving the transport supply member 5.

FIG. 5 is a schematic structural view showing a one-component developing apparatus which is another embodiment of the present invention. The developing device is provided with a developer carrying-in chamber 30 so as to be connected to an end portion of the developer containing chamber 26 in the axial direction of the carrying and supplying member, and the carrying and feeding member 25 is continuously provided from the developer containing chamber 26. It is provided so as to penetrate the developer carry-in chamber 30. The developer is sent from the developer storage box 31 to the developer carrying-in chamber 30 by the developer carrying device 29, and further, the carrying supply member 25.
Is introduced into the developer accommodating chamber 26. In this developing device, a light emitting device 27 for detecting the developer amount
The light receiving device 28 and the light receiving device 28 are provided on both sides of the carrier supply member of the developer carry-in chamber 30, and detect the amount of the developer in the developer carry-in chamber 30 and control the drive of the developer carry device 29. There is. Even in such a one-component developing device, the amount of developer in the developer storage chamber 26 can be maintained constant,
A good image can be stably formed.

[0032]

As described above, in the one-component developing device of the present invention, a light emitting device that emits light toward one of the openings on the peripheral surface of the carrying and supplying member, and the carrying and supplying member through this opening. Since a light receiving device for detecting the light passing through the inside of the container and exiting from the other opening is provided, the amount of the developer in the developer containing chamber is detected by the amount of the received light, and based on the amount of the received light. Since the control means for controlling the drive of the developer transport device is provided, the drive of the developer transport device can be controlled based on the amount of the developer in the developer accommodating chamber. Can be constantly maintained at a substantially constant amount, that is, an amount at which the function of the feeding and supplying member is sufficiently exerted. Further, in the developing device of the present invention, since the amount of the developer is measured by the height of the developer, the control can be performed without being substantially affected by the change in the charge amount of the developer due to a change in humidity. As a result, even in a downsized developing device, the developer can be stably supplied to the developer carrier, and a good image can be stably formed.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing the configuration of a one-component developing device that is an embodiment of the present invention.

FIG. 2 is a schematic perspective view showing a carrying / supplying member, a light emitting device, and a light receiving device in the one-component developing device of the above embodiment.

FIG. 3 is a diagram showing the relationship between the current value output by the light receiving device and the amount of developer in the developer accommodating chamber in the one-component developing device of the embodiment.

FIG. 4 is an explanatory diagram showing an example of a drive control method of a conveyance supply member in the one-component developing apparatus of the above-described embodiment.

FIG. 5 is a schematic configuration diagram showing a one-component developing device which is another embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Electrostatic latent image holder 2 Developer carrier 3 Developer regulating member 4 Housing 5 Conveying supply member 6 Developer accommodating chamber 7 Light emitting device 8 Light receiving device 9 Developer conveying device 10 CPU
(Control Means) 11 Developer Storage Box 12 Dispense Motor 13 Power Supply for Development Bias 14 Bias Power Supply for Developer Supply

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yutaka Toyota 2274 Hongo, Ebina City, Kanagawa Prefecture Fuji Zero Tux Co., Ltd.

Claims (2)

[Claims] 1. A developer carrying member, which is arranged so as to face an electrostatic latent image holding member on the surface of which an electrostatic latent image is formed, and which can carry a developer attached thereto, and the developer carrying member. Regulates the amount of developer that adheres to the surface of the body,
A developer regulating member that forms a uniform thin layer of developer, a developer storage chamber that stores the developer to be supplied to the developer carrier, and a developer storage box that conveys the developer to the developer storage chamber. Then
In a one-component developing device having a developer feeding device for supplying, it is composed of a cylindrical member having a plurality of openings on its peripheral surface, and is arranged substantially parallel to and close to the developer carrier, A transport supply member that rotates around an axis, a light emitting device that emits light toward the peripheral surface of the transport supply member, and one of the openings that the transport supply member emits and that has the cylindrical shape. A light receiving device that detects light emitted from another opening after passing through the inside of the member and outputs a signal based on the amount of received light, and based on a signal output by the light receiving device, A one-component developing device comprising: a control unit that controls driving. 2. The one-component developing device according to claim 1, wherein the carrying / supplying member receives light emitted from the light emitting device through two openings of the carrying / supplying member when the amount of received light is detected. A one-component developing device, characterized in that the rotation is temporarily stopped at a position where it reaches the device.