JPS59143144A - Light source device for reader printer - Google Patents

Abstract

PURPOSE:To obtain a picture print of high quality by putting a filter between a light source and a film to correct the wavelength of the illumination light of the light source. CONSTITUTION:The light of a light source 1 is irradiated on a film 3 via a lens system containing condenser lenses 21 and 22, and the light transmitted through the film 3 is projected to a screen system or a print system via a projection lens 4. A filter 10 can be put between the light source 1 and the film 3, e.g., between lenses 21 and 22 in order to correct the wavelength of the light irradiated from the source 1. A reflecting plate 5 set at the back of the source 1. The filter 10 is set a position shown by a solid line in the figure in a reader state and then shifted to the position shown by a dotted line in a print mode respectively. Thus the filter 10 is put into an optical path.

Description

[Detailed description of the invention] This article is a light source for readers and printers.
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Microfilm reader/printer & printer, project the image information of the film onto the screen to view the image, then print the image information of the film σ) onto the photoreceptor. It can be used in two modes: 2. Normally, in this type of reader/printer, one of two modes is selected by moving a mirror in the projection YC path after the projection lens, or a half mirror inserted in the projection optical path. - allows you to select two modes at the same time. Also, as the light source for illuminating the film, the same light source is used for the two modes (σ)
This light source is commonly used as a leader type 1. (
In 3, the projected image on the screen or the human 11 is blasphemous.
It is also possible to use white light (・ra 1, ) because it is a tungsten incandescent bulb or a tungsten halogen lamp.
I don't know how to use the ball.

However, from TC, in general, the photoreceptor used to print microfilm T/1 image quality has a shorter length in the visible region than in the ultraviolet region or long wavelength region.
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', the sensitivity from the long wavelength region of the visible region to the infrared region is amplified. In such a case, there is a problem that the projection lens may cause a reduction in the 1'10 quadrat power of the printed image due to chromatic aberration caused by the external light. ) When using a 1φ filter film, there is a large transparency from the long wavelength region of the viewing region to the infrared region (1) or from the short wavelength region to the ultraviolet region. , has direct sensitivity in this region1
A photoreceptor of this kind is exposed to an excessive force from a dark area (background area in the case of a negative film), so the contrast of the image is reduced.

Therefore, the purpose of this article is to provide a light source system for printers that solves the above-mentioned DI problems.

This invention will be explained below.

This labor 1. The light is from the light source J to Y as shown in Figure 1.
: A light source system for a leak printer that irradiates the condenser lens 2 (21, 22) with red light onto the film 3, and projects the transmitted light from the film 3 onto the screen system or print system through the projection lens 4. The angle of light is also σ), and light source 1
A filter for correcting the wavelength of the irradiated light from the light source 1 is inserted between the film 3 and the condenser lenses 21 and 22σ, for example, between the condenser lenses 21 and 22σ. , a light source] is provided with a reflector plate 5 for illumination, and a filter 10 is placed at the solid line position shown in the figure in the league state. tv
7. The point shown in the figure is moved to the Ai1 section and the filter 10 is inserted into the optical path.

Now, the yC4 valve 1 has a spectral luminance characteristic as shown in Fig. 2, and the yC4 valve 1 has spectral luminance characteristics as shown in Fig. 2.
As shown in the figure, when the spectral sensitivity characteristic is 1-, when there is no filter 10 for wavelength correction, the spectral characteristic for the projection y corresponds to the brightness distribution of &'', In contrast, the sensitivity in the near IR region σ) is amplified.For this reason, the current lens has large chromatic aberration in the near-infrared to infrared region, so the printed image In this case, a filter for wavelength correction can be inserted to cut out the near-infrared wind and the longer wavelength side. The printer uses a projection lens 4 (71) to project only light in the appropriate wavelength range that can fully demonstrate its performance onto the photoreceptor and print high-quality images.

At the same time, when projecting on a screen, by taking out the film 10 from inside the screen, reading can be performed using the white light illumination of the light source 1. In addition, in this case, the film 3 is irradiated with Save the infrared light to a small amount,
It also has the effect of suppressing deterioration of the film 3 due to heat.

On the other hand, in the case of a film (diazo film) having the spectral transmittance characteristics as shown in No. 41"Xl, the filter 10 for wavelength correction is
; transmits light through the film 3, so the visible Y as shown in Figure 3
: Sensitivity (sensitivity)'r; On the body, the dark areas of the film 3 are exposed to the photoreceptor, reducing print quality and image contrast and causing fog in non-image areas. In such a case, a cut filter with a wavelength longer than near infrared rays and a cut filter with a wavelength shorter than near ultraviolet should be used simultaneously as the wavelength correction filter 10, so that both printed images have good contrast. High 1TIi1-image power and 7c.

As mentioned above, this light source device inserts a filter for wavelength correction between the optical property and the film, so the performance of the projection lens cannot be fully demonstrated during printing. Only light can be projected onto the photoreceptor, resulting in high-quality image prints. In addition, since the filter for wavelength correction is placed at the light source (1) rather than the film surface, the effect of the filter on the image quality was considered (t'(
(It is possible to shorten the time for irradiating infrared and ultraviolet light onto the film, which may cause deterioration of the film.)

jr Oh, - In the above embodiment, a filter for wavelength correction is inserted between the condenser lenses 21 and 220, but it is not possible to insert the filter for wavelength correction between the light source and the film. It is.

[Brief explanation of the drawing]

Figure 1 shows this entire town (J'H-Optical system 1 showing implementation f11)
Figures 1 and 2 to PR4 are 41 columns I and 1 for illuminating the principle of weight. 1...Light*, 2 (21, 2"2) )... Condenser lens, 3... Film, 4... Projection lens, 5...
...Reflector, 10...Wavelength trij positive filter. Part l 9. Figure 2 (40050060070θ 800qθD Hasaka cttm
Figure 4: Transmission [3]

Claims (1)

[Claims] In a reader printer in which light from a light source is irradiated onto a film through a condenser lens, and the transparent pot from the film is projected onto a screen system or print thread through two lenses, the combination of the light source and the film is used. The feature is that a filter can be inserted to correct the wavelength of the irradiated light from the Q light source by 41j1.