CN101639629B - Internal-drum imaging device - Google Patents
Internal-drum imaging device Download PDFInfo
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- CN101639629B CN101639629B CN2008101425658A CN200810142565A CN101639629B CN 101639629 B CN101639629 B CN 101639629B CN 2008101425658 A CN2008101425658 A CN 2008101425658A CN 200810142565 A CN200810142565 A CN 200810142565A CN 101639629 B CN101639629 B CN 101639629B
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Abstract
The invention relates to the technical field of computer-to-plate, and discloses an internal-drum imaging device. The device comprises an imaging drum, an imaging surface which is arranged on the inside surface of the imaging drum, and a photohead which exposes the imaging surface through a modulated light beam corresponding to image information of an image to be imaged. The device also comprises a tilting mechanism and a straight-line motion mechanism, wherein the tilting mechanism is used for carrying the photohead to rotate by taking a shaft of the imaging drum as a center, so that the photohead carries out scanning exposure on the imaging surface along the circumferential direction of the imaging drum; and the straight-line motion mechanism is used for carrying the photohead and the tilting mechanism to move along the axial direction of the imaging drum. The embodiment of the invention can avoid the problem that an actual exposure position of a laser beam which is refracted by a rotary mirror is deflected from an expected exposure position so as to improve the imaging quality.
Description
Technical field
The present invention relates to CTP (CTP) technical field, relate in particular to internal-drum imaging device.
Background technology
In recent years, the CTP technology had received and has paid close attention to widely and use.So-called CTP, use exactly computing machine the original copy character image through digitized processing and slot man, directly in the enterprising line scanning imaging of forme, then through postprocessing working procedures such as development, photographic fixing or exempt from aftertreatment and process forme.Its scanning imagery process is normally: the single bundle original laser that is produced by laser instrument; Split beam system through multiplex optical fiber or complicated high speed rotating optics and split into the superfine laser beam of multi beam (normally 200-500 bundle); Every bundle light is pressed the characteristic such as bright dark of image information in the computing machine respectively through acousto-optic modulator; After the bright dark variation of laser beam modulated, become controlled light beam.Again after the line focus, the little laser of hundreds of bundle directly is mapped to the work of cutting blocks for printing of forme surface, after cutting blocks for printing through scanning, on forme, forms the latent image of image.
The CTP platemaking machine generally is divided into interior drum-type, drum type and platform-type three major types.Normally the drum of cylinder as the support forme, forme is fixed on certain fixed position of profile in the cylinder in the internal-drum imaging device.During exposure, acoustooptical modulator carries out the modulation that light and shade changes according to the light and shade characteristic of computer picture information to the continuous laser beam that laser light source produced.Laser beam after the modulation is irradiated on the tilting mirror, by tilting mirror laser beam is refracted on the cylinder and makes public.In the scanning imagery process, through rotating tilting mirror, can change the direction of laser beam, make laser beam carry out scan exposure to forme.
In research and practice process to prior art; Inventor of the present invention finds, in the scanning imagery process, needs the tilting mirror high speed rotating; Yet; Because the vibration that light can produce because of the high speed rotating of tilting mirror is squinted, and therefore the problem of the actual exposure offset ideal exposure position of the laser beam after tilting mirror reflects usually can take place, thereby the quality of influence imaging.
Summary of the invention
The embodiment of the invention provides a kind of internal-drum imaging device, can avoid the problem of the actual exposure offset ideal exposure position of the laser beam after tilting mirror reflects.
A kind of internal-drum imaging device comprising imaging drum, placing the imaging surface on the bulging inner surface of this imaging, and the photohead that said imaging surface is made public through the modulated beam of light corresponding with the image information of treating image, and said imaging device also comprises:
Tilting mechanism, being used to carry said photohead is the center rotation with the axle of said imaging drum, and said photohead is carried out along the scan exposure of said imaging drum circumferencial direction said imaging surface; And,
Straight-line motion mechanism is used to carry said photohead and said tilting mechanism moving axially along said imaging drum.
In the internal-drum imaging device of the present invention; It is the center rotation with the bulging axle that forms images that tilting mechanism carrying photohead is set; Photohead is carried out along the scan exposure of imaging drum circumferencial direction imaging surface; Make laser beam carry out scan exposure with the direction of illumination that relies on the tilting mirror rotation to change laser beam in the prior art and compare, the embodiment of the invention can be avoided the problem of the actual exposure offset ideal exposure position of the laser beam after the tilting mirror refraction, thereby can improve the quality of imaging.
Description of drawings
Fig. 1 is the structural drawing of internal-drum imaging device embodiment one of the present invention;
Fig. 2 is the structural drawing of internal-drum imaging device embodiment two of the present invention.
Embodiment
Below the preferred embodiment of internal-drum imaging device provided by the invention is elaborated.
Internal-drum imaging device embodiment one of the present invention: with reference to figure 1, the present embodiment internal-drum imaging device comprises:
Imaging drum 1, place the imaging surface 2 on the inner surface of imaging drum 1, and the photohead 3 that imaging surface 2 is made public through the modulated beam of light corresponding with the image information of treating image.
Tilting mechanism, be used for carrying photohead 3 with the axle axis A of imaging drum 1 be the center rotation (as figure Y to shown in), 3 pairs of imaging surfaces of photohead 2 are carried out along the scan exposure of imaging drum 1 circumferencial direction.
Straight-line motion mechanism, be used for carrying photohead 3 and said tilting mechanism along imaging drum 1 axially (as figure X to shown in) move.
Wherein, tilting mechanism comprises swing arm 9, bearing 7, bearing clamp device 8, gear train 11 (like gear drive) and CD-ROM drive motor 10, and photohead 3 is installed on the swing arm 9.
Straight-line motion mechanism comprises first line slideway 4, first slide block 5, first gear train 6 (like rolling ball screw driving mechanism), first CD-ROM drive motor 14 and primary importance sensor 15 (like grating).
Can regulate according to the thickness of imaging surface in radial direction for making said photohead; Can radially increase by second straight-line motion mechanism (figure Z direction), said second straight-line motion mechanism comprises second line slideway 12, slide block 13, rolling ball screw driving mechanism, servo motor, grating.
The axis of bearing 7 overlaps with axle axis A, and the inner ring of bearing 7 is arranged on the contiguous block 111 that connects straight-line motion mechanism and tilting mechanism, and the inner ring of bearing 7 is clamped by bearing clamp device 8; The outer ring of bearing 7 is arranged on the end of swing arm 9; Second line slideway 12 is arranged on the swing arm 9, and slide block 13 is arranged on second line slideway 12, and photohead 3 is arranged on the slide block 13; Imaging drum 13 is the axle center with axle axis A; Swing (figure Y to) in perpendicular to the face of axle axis A, rotary encoder is installed on the end of rotating shaft, and the rotation that is used to detect rotating shaft is to obtain the angle of swing arm 9 swings.
Servo motor 10 drives swing arm 9 through gear drive 11, and swing arm 9 drives photohead 3 and does swing, and the movement locus of photohead 3 is a cambered surface, and the imaging surface 2 with the inside surface that is positioned over imaging drum 1 during photohead 3 swings keeps equidistance.Photohead 3 focuses on one or multi-stripe laser bundle on the imaging surface 2 of inside surface of imaging drum 1.Photohead 3 every swings once, on circumferential Y one or the multiple bar chart picture is capable is exposed on the imaging surface 2, the contiguous block 111 that connects photohead 3 is installed on first slide block 5; First slide block 5 is arranged on first line slideway 4; By the motion of a rolling ball screw driving mechanism 6, after moving a segment distance, photohead 3 begins swing again and accomplishes exposure next time photohead 3 along X; In conjunction with two kinds of motions, the complete exposure image that photohead 3 is accomplished imaging surface 2.
In addition, can make photohead 3 in the semi-circumference scope, do oscillating motion in the present embodiment, begin swing in a position of diagram track; Accelerate to the b position, edge of the exposure area of reaching image planes 2; After always uniform motion arrive the c position, another edge of the exposure area of imaging surface 2, after the d position that reduces speed now stop, photohead 3 along X after moving a segment distance; Servo motor 10 counter-rotating begins new scanning motion from the d position that is equal to of next sweep trace.
In the internal-drum imaging device of the present invention; It is the center rotation with the bulging axle that forms images that tilting mechanism carrying photohead is set; Photohead is carried out along the scan exposure of imaging drum circumferencial direction imaging surface; Make laser beam carry out scan exposure with the direction of illumination that relies on the tilting mirror rotation to change laser beam in the prior art and compare, the embodiment of the invention can be avoided the problem of the actual exposure offset ideal exposure position of the laser beam after the tilting mirror refraction, thereby can improve the quality of imaging.
In addition, in the present embodiment, can make photohead 3 in the semi-circumference scope, do oscillating motion.Because do not need 360 ℃ circumference rotation, present embodiment can shorten the hunting period of photohead 3, thereby improves the scan efficiency of photohead 3.
Internal-drum imaging device embodiment two of the present invention: with reference to figure 2, present embodiment and internal-drum imaging device embodiment of the present invention are similar, and the difference part is; In the present embodiment; Said tilting mechanism comprises contiguous block 22, circular arc type guide rail 16, slide block 17, swing arm 18, bearing 19, gear drive 20, servo motor 21, and the axis of the axis of bearing 19 and circular arc type guide rail 16 and axle axis A coincide, and the inner ring of bearing 19 is arranged on the contiguous block 22; The outer ring of bearing 19 is arranged on first end of swing arm 18; Photohead 3 is arranged on second end of swing arm 18, and second end of swing arm 18 is arranged on the slide block 17, and slide block 17 is arranged on the circular arc type guide rail 16; Photohead 3 is the axle center with axle axis A, in the face perpendicular to axle axis A, swings.
Internal-drum imaging device embodiment three of the present invention: present embodiment and internal-drum imaging device embodiment of the present invention are similar; The difference part is; In the present embodiment; Being used to regulate the photohead governor motion that moves radially that imaging is roused in the swing arm upper edge is a kind of manual adjustment means, and this governor motion can comprise guiding rail and milscale.Photohead 3 is arranged on the sliding shoe of guiding rail, is connected with the movable head of milscale simultaneously, can come photohead 3 distance is radially regulated through regulating milscale.The variation in thickness of general forme just needs adjusting radially, can use this mode for the little occasion of variation in thickness frequency of the forme that uses in producing.
In addition; In order to access the pendulum angle of photohead; Among each embodiment of internal-drum imaging device of the present invention; Tilting mechanism can also comprise the rotary encoder of the pendulum angle that is used to obtain swing arm, can rotary encoder be installed on the end of rotating shaft, obtains the angle of swing arm through the rotation that detects rotating shaft.
In each embodiment of internal-drum imaging device of the present invention,,, can clamp bearing to guarantee the accuracy of exposure in order to make swing arm and photohead on imaging surface is axial, skew not take place or to rock.And,, can adopt air-bearing for reducing the resistance in the swing process.
In each embodiment of internal-drum imaging device of the present invention, photohead can comprise image device, imaging lens and light source, and wherein the type of image device can be face battle array image device, reflection micro mirror image device or linear array imaging device; Since the photohead in the embodiment of the invention need be on cambered surface exposure image; Therefore the imaging lens in the embodiment of the invention can adopt the cambered surface camera lens; The perhaps imaging lens that constitutes of at least one planar imaging camera lens and at least one aspheric correcting lens group; Wherein, the aspheric correcting lens group can comprise a cylinder eyeglass at least.
More than the internal-drum imaging device that the embodiment of the invention provided has been carried out detailed introduction; Used concrete example among this paper principle of the present invention and embodiment are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that on embodiment and range of application, all can change, in sum, this description should not be construed as limitation of the present invention.
Claims (8)
1. internal-drum imaging device; Comprising imaging bulging (1), placing the imaging surface (2) on the bulging inner surface of this imaging; And, it is characterized in that said imaging device also comprises through the photohead (3) that the modulated beam of light corresponding with the image information of treating image makes public to said imaging surface:
Tilting mechanism; Being used to carry said photohead is the center rotation with the bulging axle (an axis A) of said imaging; Said photohead is carried out along the scan exposure of said imaging drum circumferencial direction said imaging surface; And said tilting mechanism comprises contiguous block (22), arc-shaped rail (16), slide block (17), swing arm (18), bearing (19), gear drive (20) and servo motor (21), and the axle (axis A) of the axis of the axis of bearing (19) and circular arc type guide rail (16) and imaging drum coincides, and the inner ring of bearing (19) is arranged on the contiguous block (22); The outer ring of bearing (19) is arranged on the end of swing arm (18); Photohead (3) is arranged on the other end of swing arm (18), and the swing arm (18) that this end of photohead (3) is set is arranged on the slide block (17), and slide block (17) is arranged on the circular arc type guide rail (16); Photohead (3) is the axle center with the bulging axle (axis A) that forms images, swing in the face of the axle (axis A) that rouses perpendicular to imaging; And,
Straight-line motion mechanism is used to carry said photohead and said tilting mechanism moving axially along said imaging drum.
2. internal-drum imaging device as claimed in claim 1 is characterized in that, said imaging device also comprises the automatic governor motion that moves radially that is used for controlling according to control signal said photohead said imaging drum in said swing arm upper edge.
3. internal-drum imaging device as claimed in claim 2 is characterized in that, said automatic governor motion comprises line slideway, slide block, rolling ball screw driving mechanism, servo motor and grating.
4. internal-drum imaging device as claimed in claim 1 is characterized in that, it is that the rotation at center specifically is the rotation less than half cycle with the axle of said imaging drum that said tilting mechanism carries said photohead.
5. internal-drum imaging device as claimed in claim 1 is characterized in that, said tilting mechanism also comprises the rotary encoder of the pendulum angle that is used to obtain said swing arm.
6. internal-drum imaging device as claimed in claim 1 is characterized in that, said straight-line motion mechanism comprises line slideway (4), slide block (5), gear train (6), CD-ROM drive motor (14) and position transducer (15).
7. internal-drum imaging device as claimed in claim 1 is characterized in that, said bearing specifically is an air-bearing.
8. internal-drum imaging device as claimed in claim 1 is characterized in that said photohead comprises image device, and the type of said image device specifically is face battle array image device, reflection micro mirror image device or linear array imaging device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101425658A CN101639629B (en) | 2008-07-29 | 2008-07-29 | Internal-drum imaging device |
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| CN2008101425658A CN101639629B (en) | 2008-07-29 | 2008-07-29 | Internal-drum imaging device |
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| CN101639629A CN101639629A (en) | 2010-02-03 |
| CN101639629B true CN101639629B (en) | 2012-01-04 |
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| CN2008101425658A Active CN101639629B (en) | 2008-07-29 | 2008-07-29 | Internal-drum imaging device |
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Families Citing this family (3)
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| CN109782552A (en) * | 2019-02-25 | 2019-05-21 | 钧迪智能装备科技(苏州)有限公司 | A kind of direct exposure sources of arc-shaped workpiece laser |
| CN109739073A (en) * | 2019-02-25 | 2019-05-10 | 钧迪智能装备科技(苏州)有限公司 | A kind of arc-shaped workpiece laser direct-writing exposure method |
| CN113325671B (en) * | 2021-06-08 | 2022-11-25 | 深圳市先地图像科技有限公司 | Device and method for laser direct imaging on uneven surface of workpiece |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6313862B1 (en) * | 1997-05-14 | 2001-11-06 | URSULA LüSCHER | Method for transferring data and use thereof |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6313862B1 (en) * | 1997-05-14 | 2001-11-06 | URSULA LüSCHER | Method for transferring data and use thereof |
Non-Patent Citations (1)
| Title |
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| JP特开2000-39724A 2000.02.08 |
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| CN101639629A (en) | 2010-02-03 |
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Address after: 518055 Dazu laser building, 9 new West Road, North Nanshan District high tech park, Shenzhen, Guangdong Patentee after: HANS LASER TECHNOLOGY INDUSTRY GROUP CO., LTD. Address before: No. 5 road 518057 in Guangdong province Shenzhen city Nanshan District high tech park of Pine Hill Factory District No. 8 Patentee before: Dazu Laser Sci. & Tech. Co., Ltd., Shenzhen |