JPS5886569A - Copying device - Google Patents

Abstract

PURPOSE:To obtain a clear copy always, by performing a picture projection by a light from any light source, either a transmitting light or a reflecting light based on a signal of a discriminating means which discriminates the light transmitting property of an original. CONSTITUTION:In case an original is a normal paper etc., as a light of a light transmissive source 2 does not reach a photosensor 9, a reflecting source 8 is lighted at a prescribed second after the light source 2 is lighted, and the scanning movement for a rightward projection of a light transmissive source unit 3 and an optical unit 19 is performed. Actual picture projection is performed by a light which passed through a projecting slit 10 among the light of the reflecting source 8 reflected by the original. Such a driving control is performed by a controlling circuit CONT. The controlling circuit CONT selects, lights and controls the source 8 and the source 2 and at the same time controls in order to vary bias voltage of a developing sleeve 22 by a transmitting light projection and a reflecting projection.

Description

[Detailed description of the invention] Comprising a light source and a light source for projecting an image using reflected light,
The present invention relates to a novel copying apparatus in which image projection is performed using light from one of the light sources described above, depending on the type of light transmittance of the original.

Conventionally, there have been known copying devices that project images using the transmitted light of the original, such as those used to obtain docovies from microfilm, and copying devices that project images using the reflected light of the original, such as those used in ordinary electrophotographic copying machines. It is being

The copying device of the present invention combines the above two types of copying devices into leather.
It is not something that is tied up on a table, but is equipped with an identification means to judge the optical quality of the original, and the image is projected automatically using either a reflected light source or a transmitted light source according to the signal from the identification means. It is characterized by being configured to be carried out.

Therefore, according to the copying apparatus of the present invention, when the original is, for example, an X-ray photographic film, image projection is automatically performed using the light of the transmitted light source, and a copy with good halftone reproducibility can be obtained. If the original is plain paper, the image is automatically projected using the light from the reflected light source, resulting in a clear copy.

Furthermore, if the copying apparatus of the present invention projects images using both light sources using a slit projection scanning method, the identification means may also use a scanning method to successively judge the light transmittance according to the position of the document. Even in the case of an original where photographic film and plain paper are lined up, the image is projected on the photographic film part using a transmitted light source, and on the plain paper part using a reflected light source, so that both image parts are projected. Clear and excellent copies can be obtained.

Hereinafter, the present invention will be explained based on illustrated examples.

FIG. 1 is a vertical side view showing an example of a slit projection scanning type copying device, FIG. 2 is a vertical side view of a platen cover, and FIG.
The figure is a block circuit diagram, FIGS. 4 and 5 are longitudinal side views and bottom views showing other examples of the platen cover, and FIG. 6 is a partial plan view showing another example of the optical system unit.

In the figure, l is a platen cover, 2 is a transmitted light source, and 3 is a transmitted light source unit to which a transmitted light source is attached.

Hiro is a guide shaft of the transmitted light source unit 3, j is a bracket attached to the platen cover/ and supports the guide shaft 9, O is a diffuser plate that also serves as a document holder attached to the platen cover l via a compression spring, and 7 is transparent. g is a reflected light source, ri is a photo sensor, 10 is a projection screen), n, /2, n are mirrors, /11 respectively.
are the main lens, 151d, m are the auxiliary lenses, 16 is the fixed mirror, /7 is the dust-proof glass, 1g is the photosensitive drum, and among them, the optical system from the reflected light source l to the auxiliary lens tS is provided in the optical system (UNIS)/q. , 〃 is optical system unino) /q
This is the guide shaft. 2/ is a charger, and 2/ is a developing sleeve.

Copying by the copying apparatus shown in FIG. 941 can be performed in the same manner as in a conventional electrophotographic copying machine, whether the original is photographic film or plain paper. sand.

In other words, all that is required is to raise the platen cover, place the original in a fixed position on the original placing table 7, close the platen cover 7, and press the copy start button. In such a state that copying can be started, the transmitted light source unit 3 and the optical system unit/9
As shown in the figure, both are located on one end side of the guide shirt dog and the document placed in a fixed position is in such a relationship that its end blocks the optical path from the transmitted light source λ to the photosensor 9. .

When the copy start button is pressed, the transmitted light source is first turned on.

If the original is light-transmissive like photographic film, the light from the transmitted light source λ passes through the original and reaches the photosensor 9, so that the photosensor 9 outputs a signal indicating that the original is light-transparent. At No. 1, lighting of the reflected light Hz is prohibited, and then the transmission light source unit 3 and optical system unit/9 are moved to the right, that is, projection scanning movement is performed. During this projection scanning movement, the transmitted light source continues to be lit, and its light passes through the original and the projection slit 10, and then through the mirror //.

/2,13, main lens l, auxiliary lens /3. Photosensitive drum/g via fixed mirror/6 and dustproof glass 17
scan and project the image onto.

Note that, as shown in FIG. 6, a plurality of photosensors 9 are provided in parallel, so if even one of them detects the light from the transmitted light source 2, the document is determined to be light-transmissive. The above-mentioned image projection is then performed.

If the document is plain paper, the transmitted light rp,2 does not reach the photosensor 9. Therefore, after a predetermined period of time has elapsed from the lighting of the transmitted light source, the reflected light and the light source are turned on.
Next, the rightward projection scanning movement of the transmitted light source unit 3 and the optical system unit)/9 is often performed. In this case, since the light from the transmitted light source 2 is blocked by the document and is not related to image projection, the transmitted light source 2 may be turned off even when it is turned on. Image projection is performed by light that passes through the projection slit /θ out of the light that is reflected from the document and is emitted from the reflected light source, as in a normal electrophotographic copying machine.

The drive control as described above is performed by the control circuit 0 shown in FIG.
This is done by the ONT. This control circuit C0NT performs selective lighting control of the reflective light source t and the transmitted light source based on the signal from the photosensor 9, as well as controlling the drive of the charger. Controls that change between projection and reflected projection are also performed. This allows copying to be performed without fogging in any case.

Note that the platen cover l in FIGS. 1 and 2 is connected to the transmitted light source λ that moves together with the transmitted light source unit 3, as described above.
However, this may be used as a platen cover l as shown in Fig. ψ and Fig. 5.

The platen cover shown in Figures 4 and S is nx
It has a built-in transmissive surface light source 8 in which m KL lamps are arranged. When using such a platen cover l in the same way as the platen cover shown in FIGS. 1 and 2, first, for example, n EL clamps light up, optical system unit)/
When 9 enters the scanning movement, n of the right adjacent column is sequentially moved accordingly.
It is only necessary to turn on the EL clamps. Of course, depending on the size of the original, power consumption can be reduced by lighting up the number of n lights corresponding to the size of the original. Furthermore, all the EL clamps can be turned on from the beginning until the optical system unit (9) completes the scanning movement.

Even in the above-mentioned copying machine, if the transmitted light source λ is not turned off during scanning movement, or if the transmitted surface light source n is scanned or turned on completely, the document changes from light transmitting to opaque midway. If the surface changes to a light-transmitting area, do not turn on the reflective light source L and project the image using the light from the transmitted light source C or the transmitted surface light source B, and then project the image onto the light-opaque area. Then, based on the signal from the photo sensor 9, a reflected light source! can be turned on to project an image.

As a result, it is possible to obtain clear copies of both the light-transmitting and opaque portions of the original.

However, if the document changes from light-opaque to transparent, the arrangement of the reflected light source t, photosensor 9, and projection slit lθ as shown in FIG. Since it is difficult to prevent the reflected light from entering the photosensor 9, it is not possible to turn off the reflected light source 1 with a signal from the photosensor even if the original becomes light-transmissive.

The arrangement of the reflected light source t, the photo sensor 9, and the projection slit /θ in the optical system unit )/9 in FIG. , the reflected light source can be turned on or off in response to a signal from the photosensor 9. In other words, since the photo sensor and projection slit 10 are provided on opposite sides of the reflective light source, the reflective shade can easily be used as a reflective light source! The light and the reflected light of the document can be made to enter the photosensor 9 and meet with each other. Therefore, regardless of whether the reflective light source 1 is turned on or not, the photosensor uses the transmitted light source 1 or the transmitted surface light 1. The presence or absence of the light U passing through the document is detected, and based on the signal V, it is easy to turn off or turn on the reflective light source depending on the light transmittance or opacity of the document.

As described above, according to the copying apparatus of the present invention, image projection using a transmitted light source and image projection using a reflected light source are automatically performed depending on the light transmittance or opacity of the document. Clear copies can be obtained.

Note that the copying apparatus of the present invention is not limited to the above-mentioned example. For example, a light source for detecting the light transmittance of a document and nine light sources for image projection are separate, and one image projection requires flash exposure. It may also be done by

[Brief explanation of drawings]

FIG. 1 is a vertical side view showing an example of a copying apparatus of the present invention, FIG. 2 is a vertical side view of a platen cover, FIG. 3 is a block circuit diagram, and FIGS. ψ and 3 are other examples of platen covers. FIG. 1 is a longitudinal side view and a bottom view showing another example of the optical system unit. /...Platen cover, 2...Transmitted light source. 3... Transmitted light source unit, da... guide shaft, 7
...Original table, ...Reflected light source, Ri゛°
°Photosensor% 10...Projection slit, //
, /2, /3...mirror, /ri...main lens, 16...fixed mirror, /I...photosensitive drum, 19...optical system unit, 〃...guide shaft, 〃...charger, n...
Developing sleeve, n... Transmissive surface light source% CjON
T...control circuit. Patent applicant: Konishiroku Photo Industry Co., Ltd.

Claims (1)

[Claims] A copying apparatus comprising a light source for projecting an image using transmitted light of an original and a light source for projecting an image using reflected light, the copying apparatus projecting an image using one of the light sources according to the light transmittance of the original; A copying apparatus characterized in that image projection is performed using light from any of the light sources described above based on a signal from an identification means that determines the light transmittance of a document.