JPS6046430B2 - copying device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a copying apparatus having an in-mirror lens in a copying optical system, and particularly to a copying apparatus in which a part of the copying optical system is selectively switched and used as a receiving optical system. The purpose is to provide

The present invention utilizes the fact that an in-mirror lens for copying becomes a through-approximation fθ lens with twice the original focal length when the combination mirror (hereinafter referred to as "in-mirror") that makes up the in-mirror lens is removed. By installing a laser behind the in-mirror lens and making the laser beam enter the lens from which the in-mirror has been removed during reception mode, the copying optical system can also be used as an optical system for receiving calligraphic information using a laser beam. It is something.

The present invention will be explained below with reference to specific examples shown in the drawings. 1st
If the in-mirror lens 1 for copying with a focal length f shown in FIG. On the other hand, in a copying machine optical system with an in-mirror type lens, since the image is formed at the same magnification, the distance from the lens 1 to the object surface (original surface) A and to the imaging surface B is as shown in Figure 2. is on the 2nd floor. Therefore, if the light beam 3 is incident on the lens 1' with the inner mirror 2 removed from the rear (right side of the drawing) as shown in FIG. Obtained at plane A or imaging plane B. In this case, the light beam 3 is
If the incident light is deviated in the direction of θ from the intersection of the entrance pupil position (i.e., mirror surface) and the optical axis of the lens 1', that is, in the direction equal to the incident angle and exit angle θ in FIG. 'The beam emitted from the copy scanning system can be focused at the center of the effective slit on the original surface A and the image surface B. FIG. 3 shows an embodiment of a copying machine optical system configured to also function as a receiving optical system. A laser 5 is provided behind the in-mirror lens 1, and a trapezoidal prism 4 is arranged between the laser 5 and the lens 1. The laser 5 is intensity-modulated by the received bibliographic information, and the prism 4 deflects this modulated laser beam 3'' downward by θ as shown in FIG. 4. The figure now shows the copy mode. It is in a scanning state, the in-mirror 2 is inserted into the in-mirror lens 1, and the laser 5 has stopped oscillating.

In this copy scanning mode, the lamp 8 is turned on and the original scanner moves back and forth, as in the case of a normal copying machine.
At this time, the light from the document irradiated by the lamp 8 passes through the mirrors M1, M2, the in-mirror 2, and the mirror M3, and forms an image on the rotating drum 7, as shown by the solid line. In the receiving mode, the in-mirror 2 is removed as shown in FIG. 5, and the laser 5 generates a laser beam 3'' whose intensity is modulated according to the received document image information.

This laser beam 3'' is swung by the vibrating mirror 9 in a direction to obtain a transferred image on the drum surface, and is also deflected downward by θ through the prism 4, and exits the lens 1 as shown by the chain line in FIG. It is reflected by the mirror M3 and reaches the drum 7. The photosensitive drum 7 is rotated in both copying and receiving modes, but in the receiving mode, the operations of the lamp 8 and mirrors M1 and M2 associated with the copying scanner are stopped. As the laser 5, a CW semiconductor laser is most suitable because direct modulation can be easily performed and the device can be made compact.In the above embodiment, the trapezoidal prism 4 was used as the beam deflection means. Figure 6 A, b,
As shown in c, a total reflection prism 11, a mirror 12, a wedge-shaped prism 13, and others may also be used.

FIG. 7 shows the case where the present invention is applied to the optical system of an electrofax type direct copying machine, in which the document mounting glass plate 6 and the photosensitive paper conveyance surface 17 are placed almost parallel to each other. .

M1 and M3 are first and third mirrors of the direct copying type copying machine, and both mirrors are arranged in a ``-'' shape, with the top of the ``■'' shape facing the in-mirror lens 14. An in-mirror lens 1 including an in-mirror 2 serving as a second mirror of a direct copying type copying machine is provided within a housing 18 . In this housing 18, behind the in-mirror lens 1, a prism 4 as a deflecting means, a main scanning vibrating mirror 9, and a laser 5 are provided. Reference numeral 8 denotes a lamp equipped with a reflector, which serves as an illumination device and illuminates the document from the lower surface of the glass plate 7.

19 is an aperture provided between the third mirror M3 and the conveying surface 17, and 20 is a developing device.

Scanning in copy mode is similar to traditional direct copy scanning,
The driving scan of the housing 18 is carried out by moving the lamp 8, the housing 18 and the mirrors M1, N43 along the glass plate 6 as a whole.

In this case, the in-mirror 2 of the in-mirror lens 1 is in the inserted state, and the laser 5 is not oscillating. Light from the document irradiated by the lamp 8 is reflected by the mirror M1, the in-mirror 2, and the mirror M3, passes through the aperture 19, and exposes the copy paper on the conveying surface 17. The exposed copy paper is then sent to a developing device 20 and developed. In the reception print mode shown in FIG. 8, the in-mirror 2 is removed and the laser 5 is placed in the emitting state.

The housing 18, mirrors Ml, M2, etc. are stationary;
Further, the lamp 8 is also in the OFF state. The received document image information is input to a modulation device belonging to the laser 5, and the laser 5 generates a beam 3'' whose intensity is modulated according to the document image information.The beam 3'' is deflected downward by θ by a prism 4. It exits the lens 1″ and is reflected by the mirror M3, and the aperture is 19.
, and directly irradiates the photosensitive paper on the conveyance surface 17, and at the same time scans it in the main scanning direction by the action of the vibrating mirror 9. In this case, the effective main scanning direction of the laser beam is in the direction of obtaining a direct-photographed normal image. This point differs from drum scanning. As described above, according to the present invention, a conventional in-mirror type transfer type or direct copying type copying optical system can be directly applied to the reception mode. In this case, lens 1'' has an FO imaging effect in addition to the light focusing effect, and the document surface and imaging surface positions are shared in each mode, and the main scanning line is set at the center of the copying machine's effective slit. You can also bring it.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of the in-mirror lens, Fig. 2 is an explanatory diagram of the relationship between the in-mirror lens and the document surface and the image plane when used as a copying optical system, and Fig. 3 is an implementation of the copying machine optical system for both reception and reception. For example, Fig. 4 is an explanatory diagram of the laser beam deflected in that case, Fig. 5 is an explanatory diagram of the laser beam and its main scanning section seen from above in Fig. 3, and Fig. 6 is an explanatory diagram of the laser beam deflected from above. A specific example is shown in FIG. 7, which is an embodiment of the optical system of a receiving and copying machine according to the present invention, and FIG. 8 is an explanatory diagram of the receiving print mode. 1... In-mirror lens, 2... In-mirror, 3... Loser beam, 4...
Prism (deflection means), 5... Loser, 6...
...Glass plate, 7...Photosensitive drum, 8...
... Lamp, 9... Vibrating mirror.

Claims (1)

[Claims] 1. In a copying apparatus having an in-mirror lens in the copying optical system, a means for inserting the in-mirror lens in the copying mode and removing it in the receiving mode, and a means provided behind the in-mirror lens. a laser whose intensity is modulated by received document image information; a deflection means provided between the laser and the lens for deflecting the laser beam toward the copied image; and a laser before entering the deflection means. 1. A copying apparatus, comprising a scanning means for swinging a beam in a main scanning direction of a copied image, and capable of being used also as a receiving optical system.