JPS59188633A - Printer in copying device - Google Patents

Abstract

PURPOSE:To increase partially the quantity of light for the exposure of a display section by placing an auxiliary light source for the exposure of only the solid display plate. CONSTITUTION:A flash lamp 18 is placed opposite to an illumination lamp 3 so that light emitted from the lamp 18 reaches the position of an original mounting table 1 which light emitted from the lamp 3 reaches. A reflector 19 is placed behind the lamp 18.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to an improvement of a printing device in a copying machine that records additional information of symbols on copy paper together with original information.

<Prior Art> Conventionally, in the field of copying machines, a display unit consisting of a liquid crystal display element is provided in a part of a document table, and the display content of the display unit is exposed to light using an optical system, and a part of copy paper is displayed. A printing device technology for recording data is disclosed.

By the way, in the above-mentioned conventional printing apparatus, the printed content on the copy paper was not of high quality in terms of visual recognition. ■The liquid crystal display element used in the display part is TN,' (twisted nematic).
When a type liquid crystal is used, since the liquid crystal display element is equipped with a polarizing plate, it becomes effective when exposing an original.

■ When a GH (guest host) type liquid crystal is used for the liquid crystal display element used in the display section, the light transmittance of the liquid crystal display element decreases due to the color of the liquid crystal display element, making it difficult for the printing device to print. However, the contrast will be poor.

Due to reasons such as.

Therefore, it is conceivable to increase the light intensity of the illumination lamp for exposing the original, but this would increase the amount of exposure to the original and cause the originally intended copied portion of the original to become white. Of course, the above problem could be solved by providing a new optical system for the printing device, but this would make the printing device as a whole large-scale and would significantly increase the cost of the close-up camera, making it impractical.

<Object of the Invention> In view of the above-mentioned matters, an object of the present invention is to provide a printing device for a copying machine in which an auxiliary light source is specially provided to partially increase the amount of exposure light only in the display portion.

<Example> The configuration of the present invention will be described based on one embodiment.

This embodiment is directed to a copying apparatus with a fixed document table and a movable optical system, and a schematic diagram of its structure is shown in FIG.

In FIG. 1, reference numeral 1 denotes an original table of a copying machine made of a transparent glass plate, and a display section 2 made of a liquid crystal display element is embedded in one end of the document table 1. and,
The optical system includes an illumination lamp 3, a first mirror 4, a second mirror 5,
It consists of a third mirror 6, a lens 7, and a fourth mirror 8.

Then, as the optical system moves (indicated by arrow A), the image is projected onto the photosensitive drum 12 via Surin II. Since the photosensitive drum 12 is charged by a charging charger 13 according to a known technique, an electrostatic latent image is formed on the photosensitive drum 12 by the above projection. Subsequently, development (by the developing unit 14) - transfer (by the transfer charger I5) → static elimination (by the static elimination charger 16 and the static elimination lamp) are executed. In this way, copying onto copy paper (not shown in the figure) is completed.

Now, in this embodiment, a flash lamp 18 is provided at a position opposite to the illumination lamp 3, and the light from the flash lamp 18 is arranged so that the light emitted from the illumination lamp 3 reaches the place where the light from the illumination lamp 3 reaches the document mounting table 1. I made it. Note that a reflector 19 is provided behind the flash lamp 18. This flash lamp 18 and reflector-1
An enlarged view of 9 parts is shown in Figure 2.

A photosensor made of a photocoupler is placed in the middle of the moving path of the optical system, and when the optical system passes over the display section 2 located at one location on the document table L, the flash lamp 18 is instantaneously activated. It is now controlled so that it emits light.

In this way, the amount of light from the illumination lamp for document exposure and the flash lamp 18 is used to expose the display section 2, so even if the display section 2 is made of a liquid crystal display element and does not have excellent light transmittance, etc. The content displayed on the display section 2 is recorded on the copy paper as a uniform image, similar to the original portion.

As described above, in this embodiment, the display section 2 is of a reflective type, but the display section 2 is not limited to this, and a person skilled in the art can easily design the display section 2 to be a transmissive type.

Next, other embodiments of the present invention will be described.

This embodiment is directed to a copying apparatus with a movable document table and a fixed optical system, and a schematic diagram of its structure is shown in FIG.

In FIG. 3, parts equivalent to those in FIG. 1 are given the same reference numerals. In this embodiment, exposure is performed by an optical system that has passed through the convergent light transmitting body array 20, and the display section 2 displays the convergent light as the original table 1 moves (indicated by arrow B). When the transmitter array 20 is moved, the flash lamp I8 emits a flash of light.

Next, still other embodiments of the present invention will be described.

In this embodiment, a TN (TwistNem) is used as a printing device.
atic) type liquid crystal display element is used. The TN type liquid crystal display element has improved polarizing plates facing each other with a liquid crystal cell in between, and is equipped with a switching means for switching the polarizing axes of the polarizing plates to be parallel or perpendicular to each other. . Specifically, one polarizing plate has both a parallel polarizing plate part and a perpendicular polarizing plate part to the other polarizing plate, and the other polarizing plate has a parallel or perpendicular polarizing plate part. It is now possible to move alternately.

FIG. 4(a) shows a perspective view of the TN type liquid crystal display element. In the same figure (a), 21 is a liquid crystal cell and has electrode substrates etc. which face each other. An upper polarizing plate 22 and a lower polarizing plate 23 are disposed in the liquid crystal cell 21, sandwiching the liquid crystal cell 2I, and the polarization axis of the upper polarizing plate 22 is in the direction indicated by arrow C. Further, the lower polarizing plate 23 is arranged in the direction indicated by the arrow C.
It includes a polarization axis portion 23a in a direction perpendicular to the polarization axis (indicated by an arrow) and a polarization axis portion 23b in the same direction as the direction shown by the arrow C.

In FIG. 4(a), a portion 23a of the lower polarizing plate 23 is opposed to the upper polarizing plate 22 as shown in the figure.

Therefore, the polarizing plates 22 and 23a sandwich the liquid crystal cell 21 in a crossed nicol relationship, and the display mode becomes a positive type in which a dark image appears on a transparent background, as shown in FIG. 4(b). Therefore, if this positive type display is exposed with the illumination lamp 3 and flash lamp 18 and recorded on copy paper as described above, a positive image will be copied.

On the other hand, by moving the lower polarizing plate 23, as shown in FIG. 5(a).
(Parts equivalent to those in FIG. 4(a) are given the same reference numerals.

), the portion 23b of the lower polarizing plate 23 was opposed to the upper polarizing plate 22. This time, the polarizing plates 22 and 23b sandwiching the liquid crystal cell 21 have a parallel Nicol relationship, and the display mode becomes a negative type in which a translucent image is formed on a dark background, as shown in FIG. 5(b). Therefore, if this negative type display is exposed to light using the illumination lamp 3 and flash lamp 18 as described above and recorded on copy paper, a negative image will be copied.

In the above embodiment, the display section 2 is embedded in the document mounting table 1, but the display section 2 may be attached above or below the document mounting table 1.

Furthermore, as an auxiliary light source for exposing only the display section 2, a halogen lamp can be considered in addition to the flash lamp of the above embodiment, but if you look at the rise and fall characteristics of the light amount when turning on and off, The rogen lamp is fast and I 00
Since it takes more than m5ec, it may affect the document side, which is not very preferable.

Furthermore, in the above embodiment, the display section 2 is composed of a liquid crystal display element, but various solid display pieces other than the liquid crystal display element, such as PLTZ, electrochromic, etc., may be used. However, it may be necessary to take measures to change the light intensity of the auxiliary light source depending on the solid-state display piece.
Furthermore, it is also conceivable that the means for switching the polarization axes of the upper and lower polarizing plates of the above-mentioned TN type liquid crystal display element is performed by rotating one polarizing plate with respect to the other polarizing plate.

In addition, in the above embodiment, the display section 2 using a photosensor
Position detection is not necessary in a type of copying machine that exposes the entire surface of the original on the original platen 1 only once.

<Effects> As described above, according to the present invention, the present invention includes a solid-state display piece provided in a part of the document mounting table, and projects the display contents of the solid-state display piece onto the exposed surface during copying of the original, so that the copying paper is Since there is an auxiliary light source that exposes only the solid-state display piece in the printing device of the copying machine that records the displayed content,
Optical system interrupting means such as an interrupting mirror or a half mirror can partially increase the exposure amount of the solid-state display piece and transmit the displayed content of the solid-state display piece onto the copy paper without any hindrance.
This can be done easily without any new special optical system.

[Brief explanation of the drawing]

FIG. 1 is a schematic structural diagram of the printing device in the copying device according to the present invention applied to a copying device with a fixed document table and moving optical system, and FIG. 2 is an enlarged view of the printing device in the copying device according to the invention. Figures 3 and 3 are structural schematic diagrams when the printing device in the copying apparatus according to the present invention is applied to a copying machine with a movable document table and a fixed optical system, and Figures 4 (a) and (b) are FIGS. 5(a) and 5(b) are diagrams illustrating a mechanism for displaying a positive image of a printing device in a copying apparatus according to the present invention. FIGS. DESCRIPTION OF SYMBOLS 1... Original platen, 2... Display unit, 3... Illumination lamp, 4... First mirror, 5... Second
Mirror, 6 Third mirror, 7... Lens, 8...
・Fourth mirror, 12... Photosensitive drum, 18・
...Flash lamp, 19...Reflector-120
...S-bundle light transmitter array, 21...liquid crystal cell,
22... Upper polarizing plate, 23... Lower polarizing plate. Agent Patent attorney Aihiko Fuku (2 others) Figure 4 Figure 5

Claims (1)

[Scope of Claims] 1. Consists of a solid-state display piece provided in a part of the document mounting table, the displayed content of the solid-state display piece is projected onto the exposed surface of the original document during copying, and the displayed content is recorded on copy paper. What is claimed is: 1. A printing device for a copying machine, characterized in that the printing device for a copying machine is provided with an auxiliary light source that exposes only the solid-state display piece. 2. A printing device in a copying machine according to claim 1, wherein the solid-state display piece is a liquid crystal display device. 3. A printing device in a copying machine according to claim 1, wherein the light source for exposing only the solid-state display piece is a flash light source. 4. The above liquid crystal display device is a TN (Twist Nemat) display device.
3. The printing device in a copying machine according to claim 2, wherein the printing device is an ic) type liquid crystal display device. 5. Claim 4, wherein the TN type liquid crystal display device is provided with a switching means for switching the polarizing axes of the polarizing plates facing each other with the liquid crystal cell in parallel or perpendicular to each other. A printing device in the described copying machine.