JPS62171271A - Laser facsimile receiver - Google Patents

Abstract

PURPOSE:To improve the recording speed by providing an optical connection means leading a specific laser beam to a specific aperture between plural fixed laser beam sources and a aperture having plural apertures in turning motion. CONSTITUTION:An optical connection means 3 fitted to a rotary optical system 7 has a function connecting laser oscillating beams 1', 2' to the apertures 5, 6 of the optical aperture 4 having plural apertures respectively. The relation between the oscillating beam and the aperture of the destination of projecting beam is kept constant independently of the rotary angle when the rotary optical system 7 is turned. The aperture image transmitted through the apertures 5, 6 is formed with reduction onto a photosensitive film 11 loaded in the inner face of a drum 10 via a reflection mirror 9 and an image forming lens 8. The connection means 3 consists of concentric ring bands 12, 13 and the oscillating beam 1' is incident to the ring band 12 and the oscillating light 2' is made incident in the ring band 13. The ring bands 12, 13 have a function deflecting the incident laser beam to a specific position even when the beam is made incident in an optional angular position on the circumference of the ring bands. In this embodiment, to scanning picture lines are recorded by one turning scanning of the rotary optical system 7 at the same time and the recording speed is improved twice.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a laser facsimile receiving device, and more particularly, to a laser facsimile receiving device that performs multi-spora I/recording that uses laser light to increase the recording speed. Since the facsimile recording method has high resolution and high image quality, it is used in high-performance facsimile devices such as newspaper electronic transmission devices.

Conventionally, in this type of laser facsimile receiving device,
There are mainly three scanning methods for forming images.
The film is wrapped around the outside of the cylindrical surface and rotated at high speed for main scanning, and the optical system is moved at low speed along the axis of the cylinder for sub-scanning. A cylindrical internal scanning system in which the optical system is rotated at high speed on the inner surface for main scanning, and the cylinder with film mounted on the inner surface is moved in the axial direction for sub-scanning. There are three types of flat scanning methods: a one-dimensional high-speed scanning of a light beam as main scanning, and a slow movement of a moving table on which the film is placed as sub-scanning. Of these, the control of the film during high-speed recording due to the high-speed rotation of the cylinder is 7.
The cylindrical internal scanning method is superior in speed and economy because it does not require a scanning lens (fθ resis) to correct the deflection characteristics of the rotating polygon mirror or a lens to correct the tilting of the reflective surface. ing. (Imaging Electronics Society Study Group Proceedings, 76-0
5-2, February 1977) FIG. 4 is a block diagram of the main parts of an example of a conventional laser facsimile receiving apparatus using a cylindrical inner surface scanning method. In this conventional example, an optical aperture 32 provided at the center of rotation of a rotating optical system 31 is irradiated with a laser beam 35 whose intensity is modulated by a facsimile signal.
2 is formed by the imaging lens 34 via the reflecting mirror 33 on the surface of the film 37 adsorbed on the inner surface of the drum 36 having the film adsorption raindrop A36'.
7 In this conventional example, the main scanning rotation speed (that is, the rotation speed of the rotation system) is 4800 rotations/minute, and the scanning line density is 600 rotations/minute.
It takes 2 minutes to record 100 newspapers in 1,000 newspapers. There is a strong demand to further improve the recording speed and scanning line density.

[Problems to be Solved by the Invention] In the conventional laser facsimile receiving device using the cylindrical internal scanning method described above, a method of increasing the scanning line density and further increasing the recording speed is to increase the recording laser power,
There is a method of increasing the scanning speed, or decreasing the scanning speed rather than increasing it, and instead increasing the number of recording dots in parallel, thereby recording a large number of scanning lines at the same time. For the former, that is, increasing the scanning speed, there is a speed limit associated with the mechanical rotation mechanism, and the limit is 5000 rotations/rotation degree. On the other hand, the method of increasing recording dots in parallel has been difficult to realize in the cylindrical inner surface scanning method. That is, in the main part configuration diagram of the cylindrical inner surface scanning method shown in FIG. 4, the optical aperture 3 is
Even if the aperture 2 is made into an array structure and each aperture is irradiated with a plurality of laser beams 35 whose intensity is modulated independently, the aperture must rotate with the rotation of the rotating optical system 31. The laser beam 35 that irradiates the target aperture 323 is not in a spatially fixed state;
Although it is necessary to synchronize with the rotation of the rotating optical system 31 and to follow the movement of each irradiation aperture, the laser beam 35 must be deflected.
The drawback is that there is no effective means for this purpose.

An object of the present invention is to provide a laser facsimile receiving device that solves these problems. A light source, a drum that holds recording paper inside the cylinder,
An optical aperture having multiple apertures provided at the center of rotation for rotating and scanning a bright spot on the surface of the recording paper on the inner surface of the drum, and recording the transmission distance of the optical aperture. A rotating optical system consisting of an optical means and a number of lenses mounted on the rotating optical system are used for recording on the surface of the paper. [Operation] The plurality of laser beams are sieved by optical connection means for guiding them to different apertures, respectively.
). The emitted light is guided by an optical connection means attached to the rotating optical system to each of different openings of an optical aperture including a plurality of openings also provided at the center of rotation of the rotating optical system. A plurality of apertures through which independent irradiation light passes are recorded as parallel linear scanning lines on a film surface mounted on the inner surface of the cylinder by an optical condensing means mounted on a rotating optical system. . In this way, a plurality of scanned lines can be recorded in parallel using the internal scanning method, so a high recording speed can be achieved.

(Example) Next, the present invention will be explained with reference to the drawings.

Figure 7A1 is a configuration diagram of essential parts of an embodiment of the present invention, Figure 2 is a functional explanatory diagram of the optical connection means used in this embodiment, and Figure 3 is a diagram showing the creation of the optical connection means used in this embodiment. It is a figure which shows an example of a method.

This embodiment includes laser light sources 1 and 2, optical connection means 3, optical apertures 4, openings 5 and 6, rotating optical system 7, imaging lens 8, reflection mirror 9, drum 10 and film 11. 2 In this embodiment, a case where two scanning lines are recorded simultaneously will be exemplified. Since each of the laser light sources 1 and 2, which is a recording light source, records different scans, the output light intensity is modulated by the image signal of the corresponding scanning line. Optical connection means 3 attached to rotating optical system 7 connects oscillation lights 1' and 2'' of laser light sources 1 and 2 to apertures 5 and 6 of optical aperture 4 having a plurality of apertures. As shown in the figure, the oscillation light 1' of the laser light source 1 enters the aperture 6,
The oscillated light 2' of the laser light source 2 is guided to the aperture 5 (
It has some functionality. The relationship between the laser oscillation light and the aperture of the irradiation light is always maintained regardless of the rotational angular position when the rotating optical system 7 is rotated. The aperture image transmitted through the openings 5 and 6 of the optical aperture 4 is transferred to the photosensitive film 11 loaded on the inner surface of the drum 10 by the imaging lens 8 via the reflecting mirror 9 provided on the rotation axis of the rotating optical system 7. A reduced image is formed on top. Each aperture image generates an independent scanning line on the surface of the film 11).
and 2' are modulated by independent scanning image signals, so in this embodiment, two scanning lines are simultaneously recorded by one rotational scan of the rotating optical system 7, and the recording speed is doubled. By further increasing the number of openings of the optical aperture 4 and increasing the number of laser light sources by the number of openings, 2.
Therefore, the number of scanning lines to be recorded in parallel has increased more than ever before, and optical connection means that guides the oscillated light from a stationary laser light source to the opening of an optical aperture that is rotating. 3 can be realized as follows, for example. As shown in FIG. 2, the optical connecting means 3 is composed of concentric ring zones 12 and 13 centered on the rotation axis ○, and the oscillation lights 1' and 2' of the two lasers are respectively formed into stomach rings. The band is irradiated. That is, the oscillated light 1' enters the annular zone 12, and the oscillated light 2' enters the annular zone 3. This ring zone 12,1
3 has a function of deflecting an incident laser beam to a specific position when the incident laser beam enters an arbitrary angular position on the circumference of the annular zone.

That is, when the oscillation light 1' is moved in the circumferential direction on the annular zone 12, the polarized light is concentrated at a specific position P that is a specific distance away from the central axis o-o' of the annular zone 12. Further, when the oscillation light 2' is moved in the circumferential direction on the annular zone 13, a specific point Q that is different from the P point on the plane A that includes the above-mentioned point P and is perpendicular to the central axis o-o' of the annular zone Concentrate on.

By locating the openings of the optical aperture at these positions P and Q, it is possible to guide the oscillation light of a plurality of stationary laser light sources to different openings of the optical aperture that is rotating. It can be realized.

As an example, the above-mentioned ring zone can be created as follows. FIG. 3 shows an example of a method for forming an annular zone having the above function using a hologram. This forming method uses a photographic dry plate 20 and a mask 21 for forming the two zones of the annular zone. Six parallel light beams 22 with a diameter sufficient to cover the diameter of the outermost circumference of the annular zone and -P of the aperture opening shown in FIG.
The light is exposed onto the dry plate 20 by interfering with the conical wavefront 23 having a diverging source at the position. Furthermore, the divergence source position; n is another aperture Q
, and replace the mask 21 with another mask 21' with a narrower opening area, and then move the dry plate 2 again.
After exposing the photosensitive plate 20 to light, the optical connecting means 3 having the function described in FIG.

In such a real four-gram element, a high-performance element with high diffraction efficiency (the construction technology is described in the attached product bar2-1).
This has been studied in detail in the technology of reading laser scanners, etc., and this embodiment can be realized using that technology.

1' Effects of the invention [As explained above in 7Q, the present invention provides a method for directing a specific laser beam between a fixed iBk laser light source and an aperture having a plurality of rotationally moving apertures. Providing an optical connection means leading to the aperture has the effect of greatly increasing the recording speed.

[Brief explanation of drawings]

Fig. 1 is a block diagram of the main parts of an embodiment of the present invention, Fig. 2 is a functional explanatory diagram of the optical connection means used in this embodiment, and Fig. 3 is a diagram illustrating the functions of the optical connection means used in this embodiment. FIG. 4 is a diagram illustrating an example of a production method, and is a configuration diagram of a main part of an example of a conventional laser facsimile receiving apparatus using a cylindrical inner surface scanning method. 1.2... Laser light source, 3... Optical connection means, 4
゜32... Optical aperture, 5, 6... Opening, 7
．． 31... Rotating optical system, 8.34... Imaging lens,
9.33...Reflection mirror, 10.36...Drum,
11.37... Film, L2, 13... Annular zone, 2
0... Dry plate, 21... Mask, 22... Parallel light beam, 23... Conical wavefront, 35... Laser beam. 2nd 3rd place

Claims (1)

[Claims] It has a plurality of recording laser light sources, a drum that holds recording paper on its cylindrical inner surface, and a plurality of openings provided at the center of rotation for rotating and scanning a bright spot on the surface of the recording paper on the inner surface of the drum. a rotating optical system comprising an optical aperture and an optical means for forming a transmitted image of the optical aperture on the surface of the recording paper; a laser facsimile receiving apparatus, comprising: optical connecting means for guiding the respective optical apertures to different openings of the optical aperture.