JPS61261718A - Laser recording method - Google Patents

Abstract

PURPOSE:To simplify a recording device by making plural laser beams incident on different positions on a hologram disk and deflecting respective laser beams simultaneously in accordance with the rotation of the hologram disk. CONSTITUTION:The hologram disk 12 has a disk-like shape and plural hologram gratings 12-1-12-i are arranged like a single circle on onen side of a transparent substrate. Positions H1-H4 and the rotational center of the hologram disk 12 and arranged on the same straight line. The incident positions H1-H4 correspond to respective photosensitive bodies 30A-30D and respective laser beams are diffracted by the hologram gratings on the hologram disk 12 and reached to a photosensitive body 30A or the like through respective optical pathes. When the hologram disk 12 is rotated by a motor 12 under said state, respective diffracted laser beams are synchronously deflected and the spots of respective beams on the photosensitive body optically scan the photosensitive body. Thereby, it is unnecessary to form laser beam in each photodetective body, simplifying the recording device.

Description

[Detailed description of the invention] (Technical field) The present invention relates to a laser recording method.

(Prior art) Multiple laser beams modulated with color image signals corresponding to images of different colors are used to write on multiple photoreceptors in parallel to write a latent image on each photoreceptor according to each color image signal. A recording method is known in which visible images of different colors obtained by forming an image and developing each latent image are transferred and fixed onto the same recording medium to obtain a color recorded image. Publication No. 59-62879).

By the way, this Japanese Unexamined Patent Application Publication No. 59-62879 includes 2
A species recording device is disclosed. The first one is an apparatus that uses the same number of laser beam scanners as the number of photoreceptors, as shown in FIG. 2 of the same publication. However, since this device uses a plurality of laser beam scanners, it tends to be large and complicated, and has problems in that it is expensive.

The second one, as shown in FIG. 4 of the same publication, is a device in which a plurality of laser beams are deflected by the same rotating polygon mirror. In the case of this device, due to the optical arrangement, the rotating polygon mirror must be rotated 11. It is difficult to manufacture a rotating polygon mirror that is long in the axis of rotation and has good precision, so a device is required to manufacture a rotating polygon mirror.]・ Ah, 7.
Wow 5. , 'f, A6□519. ．． F, A6゜
.

(Purpose) This book was created in view of the above circumstances.1131
．． The purpose is to provide a new laser recording method that can be realized at low cost without complicating the structure of a color laser recording device.

(composition) The present invention will be explained below.

A feature of the present invention is that a plurality of laser beams are simultaneously deflected by the same holodisk.

A holodisk may contain multiple hologram gratings.1. In <, the hologram lenses are arranged in a single ring, and the center of this single ring coincides with the center of the holodisk.

Multiple laser beams interact with each other on the holodisk:
be incident on different positions.

As the holodisk rotates, the multiple laser beams
Deflected simultaneously, each laser beam is guided onto a different photoreceptor by an optical system provided according to the deviation, and writes and scans each photoreceptor.

Hereinafter, description will be given based on specific examples.

FIG. 1 is a front view showing the main parts of one embodiment of the present invention. In FIG. 1, reference numerals 10A, IOB, and IOC.

10D each indicates a light source device.

Reference numeral 14 indicates a motor, and the holodisk 12 is rotatably attached to this motor 14.

Reference numerals 16A, 16B, 16C, and 16D indicate plane mirrors.

Symbols 1'8A, 18B, 18C, and 18D indicate plane mirrors, and symbols 20A, 20B, 20C, and 20D indicate fθ lenses,
Symbols 22A, 22B, 22C, and 22D are plane mirrors, symbol 2
4A, 24B.

24C and 24D are cylindrical lenses, code 30A.

30B, 30C, and 30D indicate photoconductive drum-shaped photoreceptors. Code 26A, 26B, 26C, 2
6D is charger, code 28A, 28B, 28C, 2
8D is a developing device, codes 32A, 32B, 32C, 32D
34 is a cleaner, 34 is a conveyor belt, 36A is a
36B, 36C, 36D are ・, 1 5'+ -'
)+ +, 2″9°′”asss“°”°111
On the paper, reference numeral 38 indicates a fixing device.

1. ．． 1 Plane mirrors 16A, 18A, fO lens 20A, plane mirror 22A, □゛ (The cylindrical lens 24A is connected to the light source device 110A, ゛, □□゛.

A, 3 f, 6□, 61□168゜...)'+"1 18B, fo lens 2'OB,
Plane mirror 22B, cylindrical mirror 4''', (248L, optical
1iMf! toBh, 6 to form an optical path to the photoreceptor 30B. Plane mirrors 16C', 18C,, f.

―,,1″″/X20G・Plane mirror 220・E/IJ
y F U h ) Lt L/'X:, j
24C forms light 91i from the light source device 10C to the photoreceptor 30C. Similarly, plane mirror 16
D, '18D', fθILt2/X20D・flat i″2
″・91J″′F IJ /L/ L/″″・, double layer 2
4 D forms an optical path from the light source device 10D to the photoreceptor 30D □)j 1#″°°4・°°”・°°0・36D
lt)'5A"11)1 They are exactly the same. They are arranged around each photoreceptor.
6A, 2'6B, 26C226D, development, 1 self equipment 28A, 28B, 28C, 28D
, cleaner: 3'2A, 32B.

'zu'I 32C, 32D, transfer charger 3
6A, 36B, 36C.

, zu, ・: 36D are also similar to each other. However, the developing devices 28A, 28B, 28C, 2
In 8D, yellow, magenta, cyan, and black toners are used.

As shown in FIG. 2, the holodisk 12 is disc-shaped, and has a plurality of (eight in the example shown) disks on one side of its transparent substrate.
Hologram grating 12-1, 12=2. ..., 12
-i, . . . are arranged in a single ring shape. The center of this single ring coincides with the center 0 of the holodisk 12. Each hologram grating 12-1 is an equally spaced linear grating that is optically equivalent to each other, and the arrangement direction of the linear gratings is symmetrical with respect to the center 0.

The light source device 10A +' IOB, IOC, and 100 are the same. Taking the light source device 10A as an example, as shown in FIG. 1, the light source device is composed of a semiconductor laser LS, a lens, and a cylindrical lens CL. has been done.

The semiconductor lasers of these light source devices 10A, IOB, IOC, and 'IOD are driven to emit light using color image signals corresponding to a yellow image, a magenta image, a cyan image, and a black image, respectively.

Sate, each light source device 110A, IOB, IOC, ]OD&
When U light is emitted, the laser beams from these light source devices are reflected by plane mirrors 14A, 14B, 14C, and 14+, respectively.
:) into the holodisk 12. The incident positions of these incident lights are the light source devices 10A, IOB, I
According to each of OC and IOD, Hl shown in Fig. 2,
H2° 13. +(/l position.

The positions H1, +(2, H3, H4 and the rotation center of the holodisk 12 are on the same straight line -1-.Incidence position Hl.

82, H3, and H4 are photoreceptors 30A and 30B, respectively.

Corresponds to 30C and 30D. Each laser beam is diffracted by a hologram grating on the hologram 12, follows each optical path, and reaches the photoreceptor 30A and the like. In this state, when the holodisk 12 is rotated by the motor 14 (Fig. 1), each diffracted laser beam is synchronously deflected, and each beam has sporanes 1 to 1 on each photoreceptor (the laser beam is The cylindrical lens of the device and f
Due to the action of the o-ray lens and the cylindrical lens immediately in front of the photoreceptor, the light is focused onto the photoreceptor in a spot shape and scans the photoreceptor.

In FIG. 1, the direction of this optical scanning is perpendicular to the drawing. The incident position Hl, H2, + (3°H4 is the rotation axis 0,
fO lens 20A, 20B, 20C, 201) (20C
.

20D is set in a plane that includes the optical axis of the photoreceptor (not shown in FIG. ing. However, since the deflection direction of the deflected laser beam by the holodisk 12 is the same direction (clockwise in FIG. 2), the photoreceptor 30A.

30B and the photoreceptors 30C and 30D have opposite directions of main scanning by the laser beam. That is, in FIG. 1, for the photoreceptors 30A and 30B, the direction is from the back side of the drawing to the front side, and for the photoreceptors 30C and 30D, the direction is from the front side to the back side of the drawing.

Therefore, in the photoreceptors 30C and 30D, the beginning and end of the input one-line write signal are reversed, and the signal is sent from the end side to modulate the laser light intensity.

The linearity of each scanning line is guaranteed by the action of the cylindrical lenses 24A, 2/IB, 24C, and 24D, and the moving speed of the spora 1~, that is, the uniformity of the scanning speed, is guaranteed by the fO relen 20A, 2013.
20C.

Guaranteed by 20D.

1 soil at the time of recording, photoreceptor 3OA, 30B, 3DC
, 3DD rotate in the direction of the arrow, and charger 26A respectively.

26B, 26C, and 26D are uniformly charged.

Each of these photoreceptors is then scanned with a corresponding laser beam. At this time, the semiconductor laser of the light source device 10A is driven to emit light by a yellow image signal corresponding to a yellow image, and the semiconductor lasers of the light source device 10B, IOC, and IOD are driven to emit light by a macenter image signal, a cyan image signal, and a black image signal, respectively. It is driven to emit light. Thus, writing is performed on each photoreceptor, and a latent image corresponding to each color image signal is formed.

The latent images formed on each photoreceptor are transferred to a developing device 28A.

28B, 28C, and 28D, and a yellow visible image of yellow I to toner is developed on the photoreceptor 30A.
+3°30C and 30D have a magenta visible image,
A cyan visible image and a black visible image are formed.

Transfer paper S as a recording medium is conveyed to the left in FIG. 1 by a conveyor belt 34, and first a yellow visible image is formed by a transfer charger 36A, and then a magenta visible image is sequentially transferred by transfer chargers 36B, 36C, and 36D. A visible image, a cyan visible image, and a black visible image are transferred, and then these visible images are fixed by a fixing device 38 and discharged outside the device, thus obtaining a color recorded image. Note that each photoreceptor after the visible image is transferred is cleaned by cleaners 32A and 3.
2B, 32C, and 32D remove residual 1 to ner, respectively.

Although color image recording using four photoreceptors has been described above, it is of course possible to perform two-color recording using two photoreceptors and two light source devices.

Alternatively, multicolor recording can be performed using five or more photoreceptors and five or more light source devices.

In addition to the hologram grating shown in "-", a hologram lens may be formed on the hologram 4-. See you again
The laser light source in the light source device is not limited to semiconductor;
Of course, it is also possible to use a gas laser such as -Cd or Ar. When using such a gas laser,
The light source device will have modulation means such as an AO゛1゛ modulation element. In addition, when using a gas laser, the laser light source is in the state ゛・l′
It may be prepared for each light body, or a plurality of laser beams may be divided from one light source to correspond to each photoreceptor. In addition to a drum-shaped photoreceptor, an endless belt-shaped photoreceptor can also be used.

′: (Effect) ・′Work According to the present invention, a novel laser recording method can be provided. In this laser recording method, a laser beam scanning multiple photoreceptors is simultaneously deflected by a single holodisk, so each photoreceptor tli
There is no need to provide a laser beam scanner for each recording device, and the recording device is therefore simplified. Furthermore, since a holodisk is cheaper and easier to manufacture than a rotating polygon mirror, the cost of the recording device can also be reduced.

[Brief explanation of the drawing]

FIG. 1 is an explanatory front view showing only the main parts of an embodiment of the present invention, and FIG. 2 is an explanatory front view showing the main parts of the embodiment. 10A, IOB, IOC', IOD...Light source device, 12...Holodisk, 12-1.12-2
, ...12-i, ... hologram grating, 30A
, 3013, 30C, 30D... photoconductive photoreceptor, S... transfer paper as a recording medium.

Claims (1)

[Claims] A plurality of laser beams modulated with color image signals for images of mutually different colors are used to write on a plurality of photoreceptors in parallel to write a latent image on each photoreceptor according to each color image signal. In a recording method in which a color recorded image is obtained by forming an image and developing visible images of mutually different colors obtained by developing each latent image onto the same recording medium, multiple hologram gratings or hologram lenses are used. Laser recording, characterized in that the plurality of laser beams are incident on mutually different positions of a holodisk arranged in a single annular shape, and each laser beam is simultaneously deflected by rotation of the holodisc. Method.