JPH01231064A - Digital copying machine - Google Patents

Abstract

PURPOSE:To prevent the change of a laser oscillation unit in performance even when the unit is continuously used for a long time by providing the unit on the opposite side of a heat-fixing device about a photosensitive drum so that the heat produced from the heat-fixing device cannot be transferred to the unit. CONSTITUTION:A laser oscillation unit 34 is provided on the opposite side of a heat-fixing device 21 about a photosensitive drum 1 so the heat produced from the device 1 cannot be transferred to the unit 34. Since the laser oscillation unit 34 is far separated from the heat-fixing device 21 in such way, no heat is transferred to the unit 34 from the device 21 and the temperature of the unit 34 hardly rises even if the unit 34 is used for a long time. Usually, the performance of the semiconductor used in the labor oscillation unit 34 fluctuates in accordance with the temperature, but, since the temperature of the unit 34 does not rise even if the unit 34 is used for a long time, the performance of the semiconductor does not change. Therefore, the performance of the laser oscillation unit 34 using the semiconductor is stable and does not change even if the unit 34 is used for a long time.

Description

[Detailed Description of the Invention] [Industrial Application Separation] The present invention photoelectrically converts image information obtained by scanning and exposing a document into an electrical signal, and then converts it back into light. The present invention relates to a digital copying machine that scans and exposes a photoreceptor drum.

[Conventional technology] Light is irradiated onto the document while scanning the light source, and the reflected light is captured by a CCD.
A digital copying machine is known in which an image is formed on a photoreceptor drum, the image information obtained from a CCD is converted into digital image information, and a laser beam is modulated by the digital image information to scan and expose a photosensitive drum. There is. Conventionally, in such a digital copying machine, a laser oscillation unit has been disposed on the same side as a heat fixing device, one-by-one from the photoreceptor drum.

[Problem to be Solved by the Invention 1] In the above conventional technology, the heat generated by the thermal constant is transmitted to the laser oscillation unit 1-, and the heat generated by the laser oscillation unit itself is added to this, making it difficult to use the laser oscillation unit continuously for a long time. Then, there was a problem that the temperature of the laser oscillation-NONIT became high and the performance was unstable.

The present invention has been made in order to solve the above-mentioned problems, and therefore, it is an object of the present invention to provide a digital copying machine in which the performance of the ray'f shooting unit does not change even when used continuously for a long time.

[Means for Solving the Problems] The Ray IJ' oscillation unit is arranged on the opposite side of the thermal fixing device with respect to the photosensitive drum, so that the heat generated by the thermal fixing device is not transmitted to the Ray oscillation unit.

[Effects] Since the loser oscillation unit is far away from the heat fixing device, heat is not transferred from the heat fixing device, and the f temperature does not easily rise even if used for a long time. The performance of semiconductors changes depending on the temperature, but the fA degree does not increase even if the L unit is used continuously for a long time.

[Example] Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view showing the main parts of a digital copying machine to which the present invention is applied. In the figure, 1 is a photoreceptor in which 11 OPCs (OPC) are laminated on the L of a cylindrical conductive drum. Images 1 to 1 are formed by rotating the drum in the direction of the arrow shown in the figure. However, is the surface of the photoreceptor drum 1 cleaned by the cleaning device 2 a band? The toner is uniformly charged by the FI device 3 and irradiated with laser exposure 4, which will be described later, so that an electrostatic latent image corresponding to the 1.1-image is formed, and the toner is developed according to the LC electrostatic latent image. @Device 5 places 41st. The above-mentioned laser beam exposure 1.1 paper! l! Main scanning in 100 directions is combined with sub-scanning by drum rotation to form an electrostatic latent image corresponding to the image on the surface of the photoreceptor drum, but the image information for modulating the Ray IJ' exposure is stored in a part of the scanner. 6
It is obtained by In other words, the manuscript table 7 made of a glass plate
Light is irradiated from a light source lamp 8 onto an original placed on the original, and the light reflected from the original is reflected by mirrors 9 and 10° 11, passes through a lens 12, and enters a prism 13. The red light passing through the dichroic mirror 14 provided at the center of the prism 13 forms a linear image on the CCD 15, and the cyan light reflected by the dichroic mirror 14 forms a linear image on the CCD 16. Electrical signals generated by the scanner 19 make it possible to identify the red, blue, and black colors of the original, and masking using markers is performed. Details regarding this are shown in patent application fX (62-16554).Light source 8
and mirror 9 are integrally moved to the right from the illustrated home position, and mirrors 10 and 11 are also integrally moved to the right at 1/2 the speed of the light source. In this way, both image information of the original is sequentially input to C0D15.16. C.C.
The D15-16 outputs linear image information as a serial electrical signal, and this electrical signal is converted into digital image information by an image processing device. The laser beam modulated by the received digital image information is transmitted to the radar oscillation unit 3.
4, is reflected by the rotating polygon mirror 33'c, and then
The light is reflected by the mirror 17 and passes through the cylindrical lens 18, resulting in laser exposure 4. The two toner images thus formed on the surface of the photosensitive drum are transferred 77 by electrostatic force onto a recording paper fed by a paper feeder by a single transfer device. The rolled recording paper is divided into 7j! After being separated by electrostatic force in the Iller 20, it is thermally fixed. The image is sent to the i-device 21 and fixed on the recording paper. The paper feeding device is paper feeding)
2, paper feed roller 23, feed roller 24, 2/I...,
It consists of guides 25, 25, etc., and a spring 26.
The paper feed case I, which is pushed by the paper feed roller 23,
The recording paper inside is sent out from the paper feed cassette by a paper feed roller 23, and then sent by feed rollers 24, 24...J3 and guides 25, 25, and passes through the photosensitive drum 1 and the heat fixing device 21. Then, the 13th paper is put out one by one on the table 27. The cold 2J+ of the heat fixing device 21 is cold 7. This is carried out by the sirocco fan 28, which is a II exhaust fan, and
The hot air near No. 1 is sucked in as shown in the figure and discharged to the outside of the main body. Since the Rade oscillation unit 34 is disposed on the opposite side of the photosensitive drum 1 from the thermal fixing device and is away from the thermal fixing device, the heat of the thermal fixing device is not transmitted and it is difficult for the temperature to exceed 4 degrees. The image processing board and the exposure control board are housed in a board case 29 and placed under the scanner part 6. The above-mentioned equipment 1 is housed in an upper housing 30 and a lower housing 31, and the upper housing 30 is connected to the lower housing via a hinge 32 so as to be openable and closable. That is, the upper housing 3o and the lower housing 31 constitute a so-called clamshell.

Note that the photoreceptor drum 1, cleaning device 2, band St
Z 3 , 'The developing device 5 is housed in a ji-tridge, and the cartridge is pulled up together with the upper housing 3o, but can then be further pulled out forward from the upper housing.

[Effects of the Invention] As explained above, in the digital copying machine of the present invention, the heat generated by the RC device is not transmitted to the Rayleigh optical vibration unit 1, so it can be used continuously for a long time. Even when used, the temperature of the range oscillation unit does not easily rise, and its performance does not change.

[Brief explanation of the drawing]

FIG. 1 is a polygon cross-sectional view of the main parts of a digital copying machine to which the present invention is applied. 1... Photosensitive drum, 2... Cleaning device Vt,
3... Charger, 4... Ray) f exposure, 5... Development equipment, 6... Part of scanner, 7... Generator stand, 8...
・Light source lamp, 9° 10.11...Mirror, 12...
・Lens, 13... Prism, 14... Dichroic mirror, 15.16... CC0117... Mirror, 18... Cylindrical lens, 19... Transfer device, 20... Separator, 21 ...Heat fixing device, 22...
・Paper feed cassette, 23... Paper feed [1-ra, 24...
Feed roller, 25... Guide, 26... Spring, 27
...Paper output table, 28...Sirocco fan, 29
... Board case, 30 ... Upper case, 31 ... Lower case, 32 ... Hinge, 33 ... Rotating polygon mirror, 3
4... Laser l\i! Shooting Units +-.

Claims (1)

[Claims] A digital copying machine characterized in that a laser oscillation unit is arranged on the opposite side of a photoreceptor drum from a heat fixing device so that heat generated from the heat fixing device is not transmitted to the laser oscillation unit.