JPH0381786A - How to adjust the output of the light source for optical printers - 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 [Field of Industrial Application] The present invention relates to a method for adjusting the output of a light source for an optical printer, which uses light to form an image on a photoreceptor in accordance with an input signal.

[Conventional technology]

After charging the photoconductive photoconductor of the optical printer, the surface of the photoconductor is exposed to light to form an electrostatic latent image on the photoconductor corresponding to the information signal to be recorded, and the electrostatic latent image is transferred to the photoconductor using a magnetic brush. A method of visualizing the image using a developing method or the like has been put into practical use.

[Problem to be solved by the invention]

Generally, the photoreceptor of an optical printer has a spectral sensitivity characteristic as shown in FIG. 2, and a light source, such as an LED, having a wavelength distribution characteristic as shown in FIG. If multiple LEDs are placed one-on-one in opposition to each printed dot and the light emitting output of each LED is made constant, the electrostatic latent image potential will vary, and as a result, the print density of the visible image will vary. An object of the present invention is to eliminate the drawbacks of the prior art described above and to improve the printing quality of this type of optical printer.

[Means to solve the problem]

The object is to provide an optical printer that has an exposure light source, a photoreceptor, and an imaging optical system that forms an image of emitted light from the exposure light source on the photoreceptor, and controls light emission dot by dot according to an input signal. This is achieved by flatly adjusting the wavelength sensitivity of the photoreceptor by adjusting the light emission output of the exposure light source.

[Effect]

According to the present invention, the wavelength sensitivity of the photoreceptor for an optical printer is flatly adjusted by the light emission output of the exposure light source, thereby making it possible to adjust the individual outputs of the LED array to the spectral sensitivity characteristics of the photoreceptor. can.

〔Example〕

Below, the present invention will be explained based on the drawings.
The figure is a partial perspective view showing a specific example of an optical printer suitable for carrying out the method of the present invention.

In FIG. 1, 1 is an LED array in which a plurality of LEDs are arranged, 3 is a solar cell that detects the light output of the LED array 1,
2 is a filter that has different light transmittance depending on the wavelength of light, which is placed between the LED array 1 and the solar cell 3; 5 is a current supply device that supplies current to light up each individual LED in the LED array 1; , 4 indicates a voltmeter that detects the output of the solar cell 3.

As mentioned above, the photoreceptor of an optical printer generally has the spectral sensitivity characteristics shown in FIG. 2, so a filter having the wavelength transmittance characteristics shown in FIG. A solar cell 3 receives the light output after passing through a filter (filter) 2, which has a transmittance that differs in transmittance and has a transmittance with a slope opposite to the spectral sensitivity characteristic of the photoreceptor, and its electromotive force is measured by a voltmeter 4. By controlling the current value flowing from the current supply device 5 to each LED so that the
The individual outputs of the array 1 can be matched to the spectral sensitivity characteristics of the photoreceptor.

〔Effect of the invention〕

The present invention is as described above, and as is clear from the description of the illustrated embodiments, according to the present invention, the wavelength sensitivity of the photoreceptor for an optical printer is flatly adjusted by the light emission output of the exposure light source. , the individual outputs of the LED array can be matched to the spectral sensitivity characteristics of the photoreceptor, and the print density of the optical printer can be maintained almost constant.

[Brief explanation of drawings]

FIG. 1 is a partial perspective view showing a specific example of an optical printer suitable for implementing the method of the present invention, FIG. 2 is a spectral sensitivity characteristic diagram of a photoreceptor for an optical printer, and FIG. FIG. 4 is a wavelength distribution characteristic diagram of the LED incorporated and used, and FIG. 4 is a wavelength transmittance characteristic diagram of the filter shown by reference numeral 2 in FIG. 1 is an LED array, 2 is a filter, 3 is a solar cell, 4 is a voltmeter, and S is a current supply device. ILEE) 7L to 21s)

Claims (1)

[Claims] 1. In an optical printer that has an exposure light source, a photoconductor, and an imaging light source optical system that forms an image of emitted light from the exposure light source on the photoconductor, and controls light emission in dot units according to an input signal. . A method for adjusting the output of a light source for an optical printer, characterized in that the wavelength sensitivity of the photoreceptor is adjusted to be flat by the light emission output of the exposure light source.