JPH04348379A - Recording device - Google Patents

Abstract

PURPOSE:To obtain a distinctive contour and enable sufficient destaticization by simplifying the fitting device frame structure of a destaticization device by putting the center axis of a drum off the prolongation of a circuit board. CONSTITUTION:The destaticization device 3 is fitted in parallel to the side plate of an electric charger 2, namely, so that the surface where the bare chip LED 32 of the circuit board 31 is slantingly disposed in a radial direction of the photosensitive drum 1. The surface of the opening 33b of a lamp house 33 is so arranged that the nearly center part of a line of intersection with a plane perpendicular to the center axis of the photosensitive drum 1 is put closest to the peripheral surface of the photosensitive drum 1. Namely, the center axis of the drum 1 put off the prolongation of the circuit board 31. The structure of the device frame for fitting the destaticization device 3 to the recording device is therefore simplified and the circumference-directional light quantity distribution of light projected on the surface of the photosensitive drum 1 as to the destaticization device 3 becomes narrow and large in the maximum quantity of light, thereby performing the destaticization so that the contour is distinctive.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to recording devices such as copying machines and printers using photoconductor drums, and in particular, the present invention relates to recording devices such as copying machines and printers that use photoconductor drums, and in particular, to prevent charging of unnecessary portions of the photoconductor drum surface to prevent scumming and reduce the load on cleaning devices. The present invention relates to a recording device equipped with a static eliminator that removes static electricity through exposure.

0002

BACKGROUND OF THE INVENTION As a static eliminator as described above, the present inventor previously invented a static eliminator 3 as shown in FIG. 5, which is a plan view of FIG. did. In this static eliminator 3, 31 is a circuit board having a length spanning the width of the photoreceptor drum, and 32 is a bare chip LE arranged on the circuit board 31 in a line along the side edge 31a of the length.
D, 33 has a partition wall 33a between the bare chip LEDs 32, and the light emitted from each bare chip LED 32 is directed to the side end side as shown in FIG.
An opening 33 is formed on the side end side to emit radiation as shown by the arrow.
A lamp house 34 made of plastic or the like is provided on the circuit board 31 so as to surround the outside of the bare chip LED 32, and 34 is provided on the circuit board 31 and connected in series with each bare chip LED 32. LED32
A resistor 35 for limiting the current is a driving IC disposed on the circuit board 31 and controlling lighting of each bare chip LED 32.

As shown in the schematic side view of the recording apparatus in FIG. 6, the static eliminator 3 has an opening surface of the lamp house 33 located at the center of the intersection of the central axis of the photosensitive drum 1 and a plane perpendicular to the central axis of the photoreceptor drum 1. The surface of the circuit board 31 is arranged in a substantially radial direction so as to be brought closest to the surface of the photoreceptor drum 1,
It is used by being attached to the recording device so that the opening 33b of the lamp house 33 faces the photosensitive drum 1 side,
As a result, static electricity can be removed from areas where no charging is required with a sharp outline. However, since the surface of the circuit board 31 is oriented in the radial direction, the structure of the device frame in which the static eliminator is attached becomes complicated, and a space is created around the photoreceptor drum 1, making it difficult to downsize the recording device. I have a problem to say. In the recording apparatus shown in FIG. 6, the photosensitive drum 1 rotates in the direction of the arrow, the surface of the photosensitive drum 1 is uniformly charged by the charger 2, and the charger 2 is charged by the charger 2.
Charges outside the image forming area are removed by light from bare chip LEDs 32 that are selectively emitted, and an image exposure device (not shown) such as a slit exposure device or a laser scanner injects image exposure 4 into the charged image forming area. to form an electrostatic image, a magnetic brush developing device 5 develops the electrostatic image into a toner image, and the toner image is transferred to a recording paper P that is fed into contact with the photoreceptor drum 1 by a transfer device 6. The recording paper P
is separated from the photoreceptor drum 1 by the separator 7, and after the toner image is fixed by a fixing device (not shown), it is discharged outside the machine, and the surface of the photoreceptor drum 1 to which the toner image has been transferred is left behind by the cleaning device 8. After the toner is removed, the above-described image forming process is repeated again.

The static eliminator 3 shown in FIGS. 4 and 5 is mounted, for example, on a device frame to which the charger 2 is attached, as shown in FIG. 7, so that the surface of the circuit board 31 is parallel to the side plate surface of the charger 2. If the problem mentioned above is resolved by installing the bare chip LED
Since the light emitted from 32 is obliquely incident on the surface of the photoreceptor drum 1, a new problem arises in that the neutralization of the unnecessary charging area becomes unclear in the contour in the generatrix direction and is likely to be insufficient.

[0005]

OBJECTS OF THE INVENTION The present invention simplifies the structure of a device frame in which a static eliminator in which bare-chip LEDs are arranged is mounted, so that even if the circuit board is tilted from the radial direction, the bare-chip L
The light emitted from the ED enters the surface of the photoreceptor drum almost at right angles,
To provide a recording device in which static electricity is sufficiently removed with a clear outline.

[0006]

SUMMARY OF THE INVENTION The present invention provides a photoreceptor drum, and a circuit board having a length spanning the width of the drum, on which bare chip LEDs are arranged along the side edges of the length. In the recording device, the recording device includes a lamp house having an opening that emits light toward the side end, and a static eliminator that removes static electricity from an unnecessary portion of the drum surface, wherein the central axis of the drum is an extension of the circuit board. The recording device is characterized in that the opening surface of the lamp house is brought closest to the drum surface at approximately the center of a line of intersection with a plane perpendicular to the central axis of the drum. The configuration achieves the above objective.

[0007]

[Operation] In the recording device of the present invention, the static eliminator in which bare-chip LEDs are arranged is mounted on the device frame so that the center axis of the photoreceptor drum is separated from the extension of the circuit board, and the opening surface of the lamp house is attached to the photoreceptor drum. Due to the configuration in which approximately the center of the line of intersection with a plane perpendicular to the central axis of the photoreceptor is brought closest to the surface of the photoreceptor drum, the static eliminator can, for example, attach the circuit board to the side plate of the charger in the equipment frame in which the charger is mounted. The structure of the equipment frame to which the static eliminator is installed can be simplified so that it can be installed in parallel.
Moreover, the static eliminator has the effect of being able to perform sufficient static elimination with a clear outline.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described by way of examples with further reference to the drawings.

FIGS. 1 and 2 are cross-sectional views of essential parts of examples of recording apparatuses according to the present invention. In these recording apparatuses, a static eliminator 3 displaces a circuit board 31 parallel to a side plate of a charger 2. Therefore, even if the surface of the circuit board 31 on which the bare chip LED 32 is mounted is inclined with respect to the radial direction of the photoreceptor drum 1, the lamp house 3
The surface of the opening 33b of No. 3 is brought closest to the circumferential surface of the photoreceptor drum 1 at approximately the center of the line of intersection with a surface perpendicular to the central axis of the photoreceptor drum 1. As a result, the structure of the device frame for attaching the static eliminator 3 to the recording device is much simpler than the conventional case shown in FIG. As shown by the solid line A, the distribution width is narrow and the maximum amount of light is large, so that the static electricity is removed with a clear outline.

On the other hand, the similar light amount distribution of the static eliminator 3 of the comparative example shown in FIG. 7 has a wide distribution width and a small maximum light amount, as shown by the dashed line B in FIG. As described above, the static elimination becomes unclear in the direction of the busbar, and tends to be insufficient. In addition, a static eliminator consisting of a circuit board and a lamp house holding an array of molded LEDs has been conventionally used. In the comparative example shown in FIG. 8, which is formed in the same way as the opening surface of the lamp house and the static eliminator is installed in the same way as the static eliminator shown in FIGS. 1 and 2, the light intensity distribution of the static eliminator 3 is shown in FIG. As shown in , the distribution width is wide and the maximum light amount is the largest, and the contour in the generatrix direction becomes unclear, and inside the contour, the electric charge is removed sufficiently by a sufficient amount of light. In this FIG. 8, 321 is a molded LED;
- The same reference numerals as in FIG. 7 indicate the same functional members or the same functional parts.

Note that in the examples of FIGS. 1 and 2, the lamp house 3
3 is attached to the circuit board 31 with hot rivets, but the present invention is not limited to this, and it may be screwed or glued. Furthermore, the present invention is not limited to the example in which the static eliminator is attached to the mounting device frame of the charger in line with the charger so that the circuit board is parallel to the side plate of the charger; It may also be attached to a frame, etc.

0012

[Effects of the Invention] In the recording device of the present invention, the degree of freedom in mounting the static eliminator using an array of bare-chip LEDs is increased, the structure of the mounting device frame is simplified, and moreover, the static eliminator removes static electricity sufficiently with a clear outline. be able to.

[Brief explanation of the drawing]

1 and 2 are sectional views of main parts showing examples of recording devices of the present invention, respectively, and FIG. 3 shows circumferential light amount distributions of light incident on photosensitive drums of static eliminators of an example of the present invention and a comparative example. The graph, FIGS. 4 and 5 are a plan view and an X-
6 is a schematic cross-sectional view of a recording device in which the static eliminator shown in FIGS. 4 and 5 is installed, and FIG. 7 is a cross-sectional view of a main part of a recording device in which the static eliminator shown in FIGS. 4 and 5 is installed in a different way. 8A and 8B are sectional views of main parts of a recording device of a different comparative example.

[Explanation of symbols]

1...photosensitive drum,
2... Charger, 3... Static eliminator,
31... Circuit board, 32... Bare chip LED,
33... Lamp house, 33a... Partition wall,
33b...Aperture, 4...Image exposure,
5...Magnetic brush developing device.

Claims (1)

[Claims] 1. A photoreceptor drum and a circuit board having a length spanning the width of the drum, on which bare chip LEDs are arranged and provided along the side edges of the length, and the bare chips L
In the recording apparatus, the recording apparatus includes a lamp house having an opening for emitting ED light to the side end side, and a static eliminator that removes static electricity from an unnecessary portion of the drum surface, wherein the center axis of the drum is located on the circuit board. A recording device, characterized in that the opening surface of the lamp house is located at a substantially central point of a line of intersection with a plane perpendicular to the central axis of the drum, and is closest to the drum surface.