JPS62208036A - Reader printer - Google Patents

Abstract

PURPOSE:To eliminate the need for a means which drives a lighting means and to simplify the constitution of a reader printer by providing a light shield plate for masking with a projecting means which projects a photosensitive body with light, and turning on this projecting means when the positive copy of an original image is taken. CONSTITUTION:A mask driving part 50 has a slit plate 52 with a slit 52a nearby above a photosensitive drum 34 and light shield plates 54 and 56 (56a and 56b) as a light shield means which is positioned above the slit 52a and so movable as to open and close the slit 52a. The light shield plate 54 is held by a couple of guides 58 fixed on the top surface of the slit 52 and moved by an electromagnetic plunger 60 to the direction intersecting orthogonally with the slit 52a to open and close the slit 52a. The light shield plates 56a and 56b are held by a guide 62 parallel to the slit 52a and driven by individual motors 64a and 64b to vary the gap between the light shield plates 56a and 56b. The light shield plates 54 and 56 are provided with the projecting means which projects the photosensitive drum 34 with light and projection light is transmitted by light guide plates 56A and 56B which are made of a transparent material such as glass and acryl and a lamp 158.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a reader printer that prints both a positive original image and a negative original image onto a positive copy.

(Technical Background of the Invention) There is a reader printer that can switch between a reader mode in which an original microphotograph is enlarged and projected onto a screen, and a printer mode in which projection light is guided to a photoreceptor to obtain a hard copy. With this reader printer, it is possible to print both positive originals and negative originals onto positive copies.
Some printers are equipped with a PC (Plain Paper Copier) printing function and a masking function that hides and prints portions that do not need to be copied.

The device that performs this masking function is equipped with a masking light shielding means that blocks the projection light of the original image that enters the photoreceptor, and is designed to block the projection light of parts that do not need to be copied by moving this light shielding means. There is. Therefore, when a negative original image is made into a positive copy, the masked portion is not exposed to projection light and is not developed with toner, so that the masked portion is not colored and becomes the color of the paper, for example, white. However, when making a positive copy of a positive original image, there is a problem in that the mask subdivisions are colored black or the like by toner.

(Objective of the Invention) The present invention was made in view of the above circumstances, and it is an object of the present invention to prevent the mask portion from being colored black by toner, not only when making a positive copy of a negative original picture, but also when making a positive copy of a positive original picture. To provide a reader printer which can maintain the background color of copy paper and has a relatively simple configuration.

(Structure of the Invention) According to the present invention, the object is to move a reader printer capable of printing both a positive original image and a negative original image into positive copies so as to block projection light incident on a photoconductor on which a latent image is formed. a light shielding means capable of irradiating the photoconductor, an irradiation means provided in the light shielding means for irradiating the photoreceptor, and a mask control unit for causing the irradiation means to emit light and masking when printing the positive original onto a positive copy. This is achieved by a reader printer with special features.

Here, the irradiation means can be composed of a light guiding means and a light emitting element disposed close to the end face of the light guiding means. Furthermore, the light shielding means can be integrated with the light guiding means by attaching a light shielding tape or applying an opaque paint to the surface of the light guiding means opposite to the photoreceptor.

(Example) Fig. 1 is an overall schematic diagram of an embodiment of the present invention, Fig. 2 is a perspective view of the mask driving section thereof, and Fig. 3 is a perspective view showing an embodiment of the irradiation means integrated with the light shielding means. It is a diagram.

In FIG. 1, reference numeral 10 denotes a film stand, and a microphotographic original 12 such as a microfiche is fixed to this film stand 10. As shown in FIG. 14 is a light source; light source 1
4 is guided to the lower surface of the original image 12 via a condenser lens 16 and a reflecting mirror 18. In the reader mode, the transmitted light of the original image 12 is transmitted through the projection lens 20 and the reflecting mirrors 22 and 24.
．． 26 to a transmissive screen 28, on which an enlarged projected image of the original image 12 is formed. In the printer mode, the reflecting mirror 24 is rotated to the imaginary line position in FIG. 1, and the projected light is guided to the PPC type printer 32 by the reflecting mirror 22.30. Therefore, a latent image is formed on the photosensitive drum 34 as a photosensitive member of the printer 32.

This latent image is made visible by toner having an electrical polarity selected by the toner selection section 36. In other words, the toner sorting section 36 supplies toner that is fully charged when the original image 12 is positive, and supplies toner that is negatively charged when the original image 12 is negative, so that a toner image as a positive copy is transferred to the transfer paper 38. be done. It goes without saying that if the charging polarity of the photoreceptor is changed using a known one-component toner, there is no need to supply toner with a different polarity depending on the positive or negative original image.

This screen 28 is provided with four knobs 40 (only two are shown) which are mask position input means. That is, by rotating the knob 40, the mask position marks 42 are moved horizontally or vertically, and it is possible to designate a range outside each mark 42 to be masked. The coordinates of these marks 42 are read by a reading device (not shown) and input to the print control section 44.

In FIG. 1, 46 is a group of switches, including a switch for inputting whether the original image 12 is positive or negative, a copy start switch,
It consists of a switch for inputting the number of copies, etc. The output of this switch group 46 is also input to the print control section 44 . The output of this print control section 44 is input to a mask control section 48.

Reference numeral 50 denotes a mask driving section, which masks the masking range designated by the knob 40, which serves as the mask position input means, by the mask control section 48. This mask driving section 50
As shown in the figure, a slit plate 52 with a slit 7) 52a near the top of the photosensitive drum 34, and this slit 52
It has a light shielding plate 54 and 5'6 (56a, 56b), which are an example of a light shielding means, which are located above the slide 52a and can be moved to open and close the slide 52a. The light shielding plate 54 is held by a pair of guides 58 fixed to the upper surface of the slit plate 52, and is moved by an electromagnetic plunger 60 in a direction perpendicular to the slit 7) 52a to open and close the slit 52a. The light shielding plates 56a and 56b are held by a guide 62 parallel to the pickpocket 7) 52a, and each of the light shielding plates 56a and 56b is driven by a separate motor 64 (64a, 64b) by a rack and pinion mechanism.
6a.

It is driven to change the spacing between 56b.

These light shielding plates 54 and 56 are provided with irradiation means for irradiating the photosensitive drum 34. This irradiation means can be formed integrally with the light shielding plates 54,56. For example, when integrated with the light shielding plate 56, as shown in FIG. 3, it can be composed of light guide plates 56A-D, which are an example of a light guide stage made of a transparent material such as glass or an acrylic plate, and a lamp 58. . In this case, except for the surface of the light guide plate 56AND on the photosensitive drum 34 side and one end surface, the light shielding tape or opaque paint is applied to the light guide plate 56AND to function as the light shielding plate 56, and the lamp 58 is placed close to the transparent end surface. and arrange it.

Here, the light guide plates 56A to 56D can have various shapes as shown in FIGS. 3(A) to 3(D). Light guide plate 5 in the same figure (A)
In 6A, both the upper and lower surfaces are sloped so that the lamp 58 side is thick and the other end side is thin, and the lower surface, that is, the irradiation surface on the photosensitive drum 34 side, is made into a ground glass shape. Also, C
In the light guide plate 56B of B), only the surface opposite to the irradiation surface, that is, the light-shielding surface is formed as a slope. Same figure (C)
The light guide plate 56C has a light-shielding surface formed in a sawtooth shape, and reflects the light from the lamp 58 on the sawtooth reflection surface to guide it to the irradiation surface. The light guide plate 56D shown in FIG. 5(D) has a light-shielding surface sloped toward the tip, and this surface is formed in a sawtooth shape. As described above, by making the light guide plate 56 thicker on the lamp 58 side and thinner on the other end, the light guide plate 56 can be moved from the lamp 58 to the light guide plate 56.
It is possible to homogenize the light that enters the interior and guide it to the irradiation surface.

Furthermore, by making the light shielding surface serrated, the light can be guided to the irradiation surface more uniformly.

Note that 66 in FIG. 2 is a lamp that guides light to a light guide plate 68 that is integrated with the light shielding plate 54.

Next, the operation of this device will be explained. First, when the power is turned on, the reader mode is set, and the image of the original image 12 is enlarged and projected onto the screen 28. While looking at this screen 28, the operator rotates the knob 40 to designate and input the mask range.

This mask range is input to the print control section 44.

On the other hand, when printing, specify whether the original image 12 is negative or positive using the switch group 46, enter the number of copies, etc., and press the copy start switch. Then, the print control unit 44
controls the toner sorting section 36 so as to supply 10 toner if the original image 12 is positive, and 10 toner if the original image 12 is negative, rotates the reflecting mirror 24 to the imaginary line position in FIG. 1, and guides the projection light to the printer 32.

The projection light onto the photosensitive drum 34 is blocked by the mask driving section 50. That is, as the photosensitive drum 34 rotates, the mask control unit 48 performs a masking operation by moving each of the light shielding plates 54 and 56 at predetermined positions according to a masking range input in advance. At this time, if the original image 12 is negative, the mask control unit 48 lights up the lamps 58 and 66 to expose the mask range,
If it is positive, both lamps 58 and 66 are turned off to shield the mask range from light. As a result, toner does not adhere to the masked area, and the ground color of the transfer paper 38 appears.

In each of the above embodiments, the light shielding plates 54, 56 are integrated with the light guide plates 68, 56A-D of the irradiation means, but they may be separate bodies. Further, the irradiation means is not limited to one composed of a light guide plate and a lamp, and a light source such as a light emitting diode may be fixed to the light shielding plate in parallel with the slit.

Furthermore, in the above embodiments, the present invention has been explained using a PPC type reader printer as an example, but the present invention applies to a CPC type printer that performs masking by blocking light and a type that performs masking by light irradiation. It can be applied to all devices that need to be used together.

(Effects of the Invention) As described above, in the present invention, since the irradiation means for irradiating the photoreceptor is provided on the mask light-shielding plate, by lighting this irradiation means when making a positive copy of the original image, toner is applied to the mask area. It does not stick and can leave the background color of the transfer paper as is. Furthermore, if the mask light-shielding plate and this irradiation means are provided separately, a means for driving each separately is required, but according to the present invention, since the irradiation means is provided on the light-shielding plate, the irradiation means can be driven separately. No driving means is required, and the configuration is relatively simple.

[Brief explanation of drawings]

FIG. 1 is an overall schematic diagram of an embodiment of the present invention, FIG. 2 is a perspective view of a mask driving section thereof, and FIG. 3 is a perspective view showing an embodiment of an irradiation means integrated with a light shielding plate. . 12... Original image, 32... PPC printer, 34... Photosensitive drum as a photosensitive member, 48... Mask control unit, 54.56... Light shielding plate as light shielding means, 56A-D
, 68...Light guide plate as light guide means, 58.66...
·lamp. Patent Applicant: Fuji Photo Film Co., Ltd. Agent: Patent Attorney Yama 1) Text: Figure 1, Figure 3, Procedures Existing 11 Official Document (Spontaneous) April 2, 1986

Claims (1)

[Claims] (1) A reader printer capable of printing both a positive original image and a negative original image into positive copies, including a movable light shielding means so as to block projection light incident on a photoreceptor on which a latent image is formed, and a light shielding means provided in the light shielding means. What is claimed is: 1. A reader printer comprising: an irradiating means for irradiating the photoreceptor; and a mask control section for causing the irradiating means to emit light to perform masking when printing the positive original onto a positive copy.