CN1107976A - Rotative prism - Google Patents
Rotative prism Download PDFInfo
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- CN1107976A CN1107976A CN 94102691 CN94102691A CN1107976A CN 1107976 A CN1107976 A CN 1107976A CN 94102691 CN94102691 CN 94102691 CN 94102691 A CN94102691 A CN 94102691A CN 1107976 A CN1107976 A CN 1107976A
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Abstract
A rotating multi-surface mirror features no need of complex curved plane machining to make its metallic shaping mould and less distortion generated on its rotation. Its reflectors are formed on side surfaces of polygonal prism with predefined height and humps at all or part of periphery of its top and bottom surfaces.
Description
The present invention relates to constitute the polygonal rotating mirror of the part of optical facilities such as copy device, facsimile unit.
Polygonal rotating mirror in the past as shown in Figure 4, make the polygonal prism shape of the predetermined altitude that has a plurality of sides 1 and upper surface 2, lower surface 3, form mirror surface on side 1, the center of running through upper surface 2 and lower surface 3 is provided with mounting hole 4, is used to penetrate rotating shaft and fixes.
For this polygonal rotating mirror, the flatness of catoptron is very important.When using owing under the high speed rotating state of polygonal mirror at 3000-15000 rev/min, when side 1 and rib 5 are heaved because of centrifugal force, shown in the imaginary line of Fig. 4, taken place along with side 1 and rib 5 at the diverse location of polygonal prism heights direction and different deflections 6, therefore, on side 1 and rib 5, produce amount of distortion D.In this case, amount of distortion D is the poor of the maximal value of normal direction deflection on mirror surface usable reflection scope and the intersection on plane that comprises rotating shaft that is formed on the side 1 and minimum value.
If there is amount of distortion D, then the precision of optical facilities reduces, and therefore, is necessary to reduce this amount of distortion D.Its method is that the special surface that has under static state deducted above-mentioned amount of distortion D is made in side 1, then becomes the plane when its rotational deformation.
But, polygonal rotating mirror has various angles number under polygonal prism shape, pass the mounting hole 4 of the center setting of its upper surface 2 and lower surface 3 by rotating shaft, polygonal mirror to the distance of rotation center along with the difference of the position of circumferencial direction on the side 1 difference, and, the periphery of mounting hole 4 is also different along with the change in location of circumferencial direction on the side 1 with the spacing of side 1, therefore, acting on the size of the centrifugal force on the side 1 and the mode of heaving of side 1 becomes along with circumferential locations on the side 1, so the various piece of the deflection of above-mentioned side 1 on above-mentioned side 1 changes complicated.Therefore, in the above-mentioned method that deducts deflection, be necessary complicated curved surface is made in the side of metal pattern that forms the side 1 of polygonal rotating mirror, compare, have the processed complex difficulty, a problem such as many, the cost up of expending time in plane processing.
The present invention will address the above problem as problem, provide the job operation that can enoughly not carry out complex-curved processing to make metal mould for formation and the little polygonal rotating mirror of generation amount of distortion in rotation is used.
In order to address the above problem, the present invention forms on the polygonal prismatic side of predetermined altitude in the polygonal rotating mirror of mirror surface, forms projection on full week of outer rim of the upper surface of this polygonal prism and lower surface or part.
Polygonal rotating mirror is rotated as if the high speed with 3000-15000 rev/min, and the side that then is provided with mirror surface can produce amount of distortion owing to centrifugal force is heaved.The generation reason of this amount of distortion is, center section in the side short transverse, because there is the formation thing of rotating multisurface body in its upper and lower both sides, thereby being subjected to the influence of centrifugal force from both sides, deflection is bigger, and for the upper and lower surface at the polygonal prism of a side contacts air, because only be subjected to the centrifugal force of a side, so the deflection of upper and lower near surface reduces, so, the difference of generation deflection on the short transverse of polygonal prism.
In addition, this amount of distortion is different to the density of the distance of side, rotating speed, material and rigidity etc. because of the shape of polygonal prism, rotation center, also the length of side along with polygonal prism is different with the variation of the ratio in mounting hole aperture, therefore, the amount of distortion that has a rib part is greater than the situation of the amount of distortion of lateral parts and situation in contrast to this.As previously mentioned, this amount of distortion is the poor of the maximal value of normal direction deflection on usable reflection scope and the intersection on plane that comprises rotating shaft of the set mirror surface in side and minimum value, and this amount of distortion can be calculated according to density and rigidity, the shape of rotating speed, material, and its result of calculation and actual measured value have good consistance.
Thereby if the edge part on upper and lower surface is made the shape that centrifugal force is increased, then the deflection of upper and lower near surface increases, and makes its deflection that equals the center section of side short transverse, just can reduce the impaired degree of lateral plane degree.That is, in the big part of amount of distortion, the big projection of weight is set at the edge on upper and lower surface, in the little part of amount of distortion, the little projection of weight is set at the edge on upper and lower surface.Certainly, in the part that need not revise amount of distortion, just needn't projection be set at the edge part on upper and lower surface.
The present invention forms on the polygonal prismatic side of predetermined altitude in the polygonal rotating mirror of mirror surface, forms projection on full week of outer rim on the upper and lower surface of above-mentioned polygonal prism or part.Thereby, when polygonal rotating mirror rotates, the part that has above-mentioned projection at the upper and lower marginal surface of polygonal rotating mirror, the centrifugal force that acts on projection puts on the edge on the upper and lower surface of above-mentioned polygonal prism as increment, thereby the deflection of above-mentioned edge on above-mentioned normal direction increases and the corresponding quantity of this centrifugal force incremental portion, the deflection at the edge on upper and lower surface is near the deflection of middle part on the short transverse of side, and above-mentioned amount of distortion will reduce.
Fig. 1 is planimetric map and the A-A sectional view of the present invention the 1st embodiment.
Fig. 2 is planimetric map and the B-B sectional view of the present invention the 2nd embodiment.
Fig. 3 is planimetric map and the C-C sectional view of the present invention the 3rd embodiment.
Fig. 4 is the planimetric map and the E-E sectional view of example in the past.
According to Fig. 1-Fig. 3 embodiments of the invention are described below.
The 1st embodiment shown in Figure 1 increases the deflection on 1 whole edge, side substantially equably, and the material polycarbonate of polygonal rotating mirror is provided with same projection 7 at the upper surface 2 of six prisms of polygonal rotating mirror and the edge of lower surface 3 on full week.The six prismatic length of sides that form mirror surface on the side 1 are 20mm, and the height of projection 7 is that 0.3mm, width are 1mm, and not containing projection 7 height at six interior prisms is 4mm.
Be provided with after the projection 7 of present embodiment, when polygonal rotating mirror rotated, projection produced centrifugal force on 7, this centrifugal force as incremental contribution in the upper surface 2 of polygonal rotating mirror and the edge of lower surface 3.Consequently the deflection of the part of joining with the full week of edge of above-mentioned upper surface 2 and lower surface 3 on the side 1 increases, and the difference of the deflection of center section reduces on the deflection of side 1 this part and side 1 short transverse, thereby the amount of distortion of side 1 and rib 5 reduces.
Figure 2 shows that the 2nd embodiment, the amount of distortion of 1 each position of circumferencial direction has nothing in common with each other in the side, near the amount of distortion of the lateral parts of rib 5 amount of distortion greater than digonous center section side, this embodiment is effective for the amount of distortion of digonous center section side for the situation of the fractional value that needn't revise.The material of polygonal rotating mirror is a polycarbonate, and only the position of intersecting with rib 5 on the upper surface 2 of six prisms, lower surface 3 is provided with projection 7.The six prismatic length of sides that form mirror surface on the side 1 are 20mm, and the height of projection 7 is 0.3mm, and its cross section is a triangle, and not containing projection 7 height at six interior prisms is 4mm.
After present embodiment is provided with projection 7, when polygonal rotating mirror rotates, produce centrifugal force on above-mentioned protruding 7, this centrifugal force as incremental contribution in the crossing position of the edge of polygonal rotating mirror upper surface 2 and lower surface 3 and rib 5.Its result increases with the deflection of approaching rib 5 parts in the edge of above-mentioned upper surface 2 and lower surface 3, and the difference of the deflection of center section reduces on the deflection of this increase and the rib 5 part short transverses, thereby the amount of distortion of rib 5 parts reduces.
The 3rd embodiment shown in Figure 3 is for amount of distortion difference on each position of side 1 circumferencial direction, also be necessary that greater than the amount of distortion of digonous center section side 1 and the amount of distortion of digonous center section side 1 situation about revising is effective near the amount of distortion of the part side 1 of rib 5.Projection 7 is set on the whole edge of the upper surface 2 of polygonal rotating mirror six prisms and lower surface 3, and its height is big, little in digonous middle part at rib 5 positions.The six prismatic length of sides that form the side 1 of mirror surface are 20mm, and the height of projection 7 is up to 0.4mm in high part, and minimum in low part is 0.2mm, and the width of projection 7 is 1mm, and not containing projection 7 height at six interior prisms is 4mm.
After present embodiment is provided with projection 7, if polygonal rotating mirror rotates, produce centrifugal force on then above-mentioned protruding 7, the part that this centrifugal force intersects at the edge of polygonal rotating mirror upper surface 2 and lower surface 3 and rib S is with the centrifugal force increment generation effect of maximum, and has an effect with little centrifugal force increment on the edge of the upper surface 2 of side, digonous middle part 1 and lower surface 3.Its result, rib 5 increases at most near the part deflection of above-mentioned upper surfaces 2 and lower surface 3, digonous between the middle part increase minimumly near the marginal portion deflection of above-mentioned upper surface 2 and lower surface 3, thereby can suitably reduce the amount of distortion of mirror surface.
With above-mentioned the 2nd embodiment with there is not projection 7 example in the past under 10000 rev/mins of speed, to rotate, the amount of distortion of measuring and relatively being taken place, results verification, the amount of distortion of example was 0.015 μ m in the past, the amount of distortion of the 2nd embodiment is reduced to 0.005 μ m.
Polygonal rotating mirror of the present invention is not limited to the foregoing description, may implement with various forms.For example, bossing only otherwise block the light of toward mirror face, its shape can freely design.
The amount of distortion that polygonal rotating mirror of the present invention is taken place in rotation is used is little, can improve the precision of images of optical facilities such as copy device, facsimile unit, and can make metal mould for formation with the job operation that needn't carry out complex-curved processing, thereby play the effect that can reduce manufacturing cost.
Claims (1)
1, a kind of polygonal rotating mirror, its mirror surface is formed at the side of the polygonal prism of predetermined altitude, it is characterized in that, forms projection on full week of outer rim of the upper surface of above-mentioned polygonal prism and lower surface or part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94102691 CN1061442C (en) | 1994-03-04 | 1994-03-04 | Rotative prism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94102691 CN1061442C (en) | 1994-03-04 | 1994-03-04 | Rotative prism |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1107976A true CN1107976A (en) | 1995-09-06 |
| CN1061442C CN1061442C (en) | 2001-01-31 |
Family
ID=5030760
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 94102691 Expired - Fee Related CN1061442C (en) | 1994-03-04 | 1994-03-04 | Rotative prism |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1061442C (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105974502A (en) * | 2016-07-21 | 2016-09-28 | 武汉海达数云技术有限公司 | Reflecting mirror of three-dimensional laser scanner and three-dimensional laser scanner |
| CN105974555A (en) * | 2016-07-22 | 2016-09-28 | 武汉海达数云技术有限公司 | Three-dimensional laser scanner metal prism and installation shaft and three-dimensional laser scanner |
| WO2022078086A1 (en) * | 2020-10-14 | 2022-04-21 | 深圳技术大学 | Rotating mirror having small-deformation and high-fundamental frequency topological structure and used for ultra-high-speed camera |
-
1994
- 1994-03-04 CN CN 94102691 patent/CN1061442C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105974502A (en) * | 2016-07-21 | 2016-09-28 | 武汉海达数云技术有限公司 | Reflecting mirror of three-dimensional laser scanner and three-dimensional laser scanner |
| CN105974502B (en) * | 2016-07-21 | 2020-01-14 | 武汉海达数云技术有限公司 | Reflecting mirror in three-dimensional laser scanner and three-dimensional laser scanner |
| CN105974555A (en) * | 2016-07-22 | 2016-09-28 | 武汉海达数云技术有限公司 | Three-dimensional laser scanner metal prism and installation shaft and three-dimensional laser scanner |
| WO2022078086A1 (en) * | 2020-10-14 | 2022-04-21 | 深圳技术大学 | Rotating mirror having small-deformation and high-fundamental frequency topological structure and used for ultra-high-speed camera |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1061442C (en) | 2001-01-31 |
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