JPH01158456A - Image recording device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Technique 4, Section 1 The present invention relates to an image recording method using an optical scanning method in which an image is recorded by performing optical scanning on a photoreceptor based on external digital image information.

Conventionally, this type of image recording method has been used to drive a semiconductor laser 1 using a drive signal DS corresponding to digital image information sent from the outside, as shown in FIG. The modulated laser beam is then sent to an imaging lens.

The light is sent onto the photoreceptor drum 4 through an optical system 2 consisting of a light deflector such as a galvanometer mirror, and exposed. (indicates the sub-scanning direction),
In response to this phenomenon, an image is recorded on a transfer paper (not particularly shown) by performing a fixing process. In FIG. 1, 5 indicates a charging section, and 6 indicates a developing section. This method of recording images using laser light has good light condensing properties, good light utilization efficiency, can directly apply light modulation, and is compact and low in power consumption. It also has many advantages, such as being able to form an array of laser diodes and performing high-speed writing.

Normally, when writing optical information on a photoreceptor, 650 nm
The sensitivity of the photoreceptor decreases as the wavelength of the light exceeds a certain level, so it is desirable to use a writing light source whose emission wavelength is equal to or less than the above wavelength.

However, the emission wavelength of the semiconductor laser 1 is about 700 to 750 nm even if it is short, and the sensitivity to the photoreceptor is not very good, and when light of such a wavelength is incident on the photoreceptor, as shown in FIG. Since there is little absorption of light inside the drum base 41, a large amount of light reaches the drum base 42 (usually made of aluminum), and is reflected by the photoreceptor 4.
The light reaches the surface of the photoreceptor 41 and is further reflected there, which is repeated, and a phenomenon of so-called multiple reflections occurs inside the photoreceptor 41. Therefore, when long wavelength light is incident on the photoreceptor 41, the actual exposure diameter on the photoreceptor 41 ends up being larger than the diameter of the incident light due to multiple reflections within the photoreceptor 41.
The recorded image becomes blurred or its resolution becomes poor, resulting in a decrease in image quality.

In particular, the laser beam is applied to the photoreceptor 4 using a galvanometer mirror or the like.
1, the angle of the laser beam incident on the photoreceptor 41 becomes large at the end of the main scan, and the actual exposure diameter due to the multiple reflections described above becomes the maximum. There is a drawback that the quality of the recorded image in some parts is significantly degraded.

Note that FIG. 2 shows the state when a laser beam whose radiation emittance has a Gaussian distribution is incident on the photoreceptor 41.
Its maximum radiation intensity■. 6 Normally, the surface of the aluminum drum base 42 is 0.
．． It has a reflectance of about 6 to 0.8, and the laser light incident on the photoreceptor 41 is directed from work B → A → B2 →...
As a result, multiple reflections occur inside the photoreceptor 4.
The actual exposure diameter to 1 will be 10 to 20% larger than the diameter 2W of the incident laser light, where the diameter W of the laser light is I/In"e-2 (I: average This is the beam radius at a point defined by the radiation intensity (radiation intensity).The photoreceptor 41 is made of a photosensitive layer or a photoconductive layer such as a Se-based or CdS-based material, and its thickness is usually 30 to 80 mm.
Thicknesses on the order of μm are often used.

The present invention has been made in consideration of the above points, and has made it possible to record high-quality images by suppressing the effects of multiple reflections that occur inside the photoreceptor when the laser beam is incident. An image recording method is provided.

In the following, one embodiment of the present invention will be described in detail with reference to the accompanying drawings.

In the image recording method according to the present invention, when exposing the photoreceptor using a light beam in a long wavelength range with poor light absorption inside the photoreceptor, for example, a laser beam emitted from a semiconductor laser, the first step is to expose the photoreceptor to light. As shown in Figure 3, Mg is applied to the surface of the base 42.
It is preferable to use a photosensitive recording medium in which a light diffusion layer 43 is formed by adhering powder such as O to a thickness of 1 μm or less using a conductive resin or the like.

By using a photosensitive recording medium formed in this way, even if the photoreceptor 41 is exposed to long wavelength light with relatively low sensitivity, the light transmitted through the inside of the photoreceptor 41 will not cause the powder to bind to the binder. The specular reflection direction component is significantly reduced by being diffused by the light diffusion layer 43 in which the light is dispersed, and multiple reflection light generated inside the photoreceptor 41 can be reduced.

elephant rice The above describes the image recording method according to the present invention.

Photosensitive recording in which a layer is formed between the photoreceptor and the base to prevent specular reflection of incident light when an image is recorded by exposing the photosensitive recording medium to an optical signal carrying image information. This system uses a medium to prevent multiple reflections from occurring inside the photoreceptor even when exposure is performed using a relatively long-wavelength optical signal, and unlike conventional methods, the apparent exposure diameter becomes larger and the image is It has the excellent advantage that high-quality images can always be recorded without blurring or deterioration of resolution.

[Brief explanation of the drawing]

Figure 1 is a simplified configuration diagram showing an image recording device using a general optical scanning method, Figure 2 is a diagram showing the state of multiple reflections of incident light that occurs inside the photoreceptor, and Figure 3 is a diagram showing light diffusion on the base surface. 1 is a side sectional view showing an example of the structure of a photosensitive recording medium in which a layer having a reflective surface with good properties is formed. 41...Photoreceptor 42...Base 43...Mg
Layer with a light-diffusing surface in which powder such as O is dispersed in a binder Applicant Kiyoshi Torii Figure 1 Figure 2 Figure 3 Procedural Amendment 2 Title of Invention Image Recording Method (674) Co., Ltd. Ricoh - (Delivery date Showa, month, day) Column for detailed explanation of the invention in the specification ・:,... 8 Contents of amendment (1) Between the second and third lines of page 5 of the specification , ``Furthermore, as the photoreceptor 41, a conventionally known organic photoconductor can be used, and the organic photoconductor may be a single-layer one,
Alternatively, a stack of a charge generation layer and a charge transport layer may be used. Charge generation layer. The thickness of the charge transport layer is generally 0.1 to 2 μm, respectively.
It is about 5 to 50 μm. ” is inserted. ′(2
) Page 6, line 6 of the specification, next to "It will be possible.""The light diffusing layer 44 has a light diffusing surface formed by dispersing powder in a binder." If so, the powder, binder, thickness, etc. can be selected as appropriate.Furthermore, if the light diffusion layer 44 needs to be conductive, a conductive resin may be used as the binder. , an appropriate method such as adding a conductive agent may be used. When providing the light diffusion layer 44 on the surface of the base 42, in order to strengthen the adhesive force between the two, the surface of the base 42 is formed with unevenness, and then A light-diffusing layer may be provided in the area.'' is inserted.

Claims (1)

[Claims] An electrostatic latent image is formed on a photosensitive recording medium comprising a photoreceptor including a photoconductive layer on a base by uniformly charging it and exposing it to a laser beam carrying image information. In an image recording method in which an image is visualized with a toner and the developed image is transferred to a transfer medium, a layer having a light-diffusing surface formed by dispersing powder in a binder is provided between the base and the photoreceptor. An image recording method characterized in that: