CN101769766A - Slit photoelectric cell for incremental photoelectric encoder - Google Patents
Slit photoelectric cell for incremental photoelectric encoder Download PDFInfo
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- CN101769766A CN101769766A CN 201010108767 CN201010108767A CN101769766A CN 101769766 A CN101769766 A CN 101769766A CN 201010108767 CN201010108767 CN 201010108767 CN 201010108767 A CN201010108767 A CN 201010108767A CN 101769766 A CN101769766 A CN 101769766A
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Abstract
The slit photoelectric cell for an incremental photoelectric encoder belongs to the technical field of photoelectric technology. A photoelectric cell in the existing incremental photoelectric encoder is matched with a code wheel and a slit to be used, and while the gap of the code wheel and the slit is decided by light diffraction, so the gap is small. Thus, the need of the processing precision of the related size of related parts in the existing incremental photoelectric encoder is high, otherwise, the adjustment is difficult; the gap is small, so dish friction is easy to generate; and the gap is big, the signal quality is low. The slit photoelectric cell for an incremental photoelectric encoder is formed by a plurality of graduating cell bars. The graduating cell bars are distributed in parallel, and are electrically connected with a pitch P. The slit photoelectric cell for an incremental photoelectric encoder does not need slits.
Description
Technical field
The present invention relates to a kind of slit photoelectric cell for incremental photoelectric encoder, belong to field of photoelectric technology.
Background technology
Incremental optical-electricity encoder is the digital sensor that is used for control automatically and angle displacement measurement.Slit and photoelectric cell are the important composition parts of incremental optical-electricity encoder.Incremental optical-electricity encoder mainly is made up of light source 1, object lens 2, code-disc 3, slit 4, photoelectric cell 5 and logical circuit 6, sees shown in Figure 1.Light source 1 adopts luminotron.Code-disc 3 is round gratings.Three groups of grooves are arranged on the slit 4, be called A group groove, B group groove, Z and organize groove, A group groove, B group groove are positioned on the code channel and serial, and Z organizes groove and is positioned on another code channel, sees shown in Figure 2.Two adjacent grooves 7 are at a distance of pitch P, and A group groove, B group groove differ
1/
4P sees shown in Figure 3.Photoelectric cell 5 is strip, sees shown in Figure 4.The corresponding photoelectric cell 5 of every group of groove on the slit 4.The course of work of incremental optical-electricity encoder is as follows, code-disc 3 is as moving grating, slit 4 is as deciding grating, code-disc 3 rotation under the acting in conjunction of the groove 7 on grid line on the code-disc 3 and the slit 4, produces optical gate type Moire fringe 8 from the light of light source 1, object lens 2, and image in photoelectric cell 5, see shown in Figure 4ly, corresponding three groups of grooves form main signal A respectively, declare phase signals B and zero signal Z on three photoelectric cells 5.The size of these characterization code-disc 3 corners also provides phase place simultaneously and turns to judgement, handles through logical circuit 6 and realizes measuring.
The prior art weak point is:
1, the gap between code-disc 3 and the slit 4 is decided by diffraction of light, thereby the gap is less, and is higher to the requirement on machining accuracy of the relevant size of the correlated parts in the photoelectric encoder first, second adjusts difficulty, the gap is little easy generation wiping dish, big signal quality is low.
2, code-disc 3 and slit 4 gaps are influenced by environmental temperature, cause jitter.
3, since slit 4 on every group of groove corresponding with photoelectric cell 5, so photoelectric cell 5 sizes can not do too little, be unfavorable for miniaturization; And because photoelectric cell 5 receiving areas are big, uneven illumination is even, influences signal quality.
4, slit 4 and photoelectric cell 5 are installed adjustment respectively, are unfavorable for industrialization.
Summary of the invention
The objective of the invention is to improve the signal quality and the measurement stability of incremental optical-electricity encoder, and reduce requirement, be reduced in installation in the assembling process of incremental optical-electricity encoder, adjust difficulty the correlated parts machining precision.For this reason, we have invented a kind of slit photoelectric cell for incremental photoelectric encoder.
The present invention is achieved in that and sees Fig. 5, shown in Figure 6, and slit photoelectric cell 9 is made of some groove shape photoelectric cell bars 10, and some groove shape photoelectric cell bars 10 are arranged side by side, is electrically connected to each other, at a distance of a pitch P.
Its effect of the present invention is, the shape of each the groove shape photoelectric cell bar 10 in the slit photoelectric cell 9 with arrange and optical gate type Moire fringe 8 of the prior art imaging on photoelectric cell 5 coincide, the signal of formation is same as the prior art.But, need not to re-use slit 4, directly cooperate by slit photoelectric cell 9 with code-disc 3, see shown in Figure 7.Use three slit photoelectric cells 9, be placed in code-disc 3 after, the position is identical with the position of photoelectric cell 5 of the prior art, wherein two slit photoelectric cells 9 differ on a code channel and serial
1/
4P forms main signal A, declares phase signals B, sees shown in Figure 6; The 3rd is positioned on another code channel, forms zero signal Z, handles through logical circuit 6 and realizes measuring.
Because adopt the incremental optical-electricity encoder of slit photoelectric cell 9 of the present invention not re-use slit 4, the problem that produces because of slit 4 disappears thereupon.The one, Comparatively speaking, gap between slit photoelectric cell 9 and the code-disc 3 is bigger than the gap between slit 4 and the code-disc 3, can not produce Yin Wendu raises and the wiping dish phenomenon of appearance, also can reduce requirement to the precision of the relevant size of correlated parts, for example shaft shoulder thickness deviation can by ± 0.02 reduce to ± 0.1, owing to can reduce machining precision, also just reduce processing cost.The 2nd, do not re-use slit 4, thereby just cancelled slit base yet, therefore, the present invention's scheme helps the miniaturization of photoelectric encoder.The 3rd, with regard to existing photoelectric encoder, code-disc 3 and slit 4 constitute the double grating diffraction structure, and be therefore, strict to the gap between the two.Gap little then Moire fringe contrast is big, although the luminous angle of luminotron and code-disc 3 are all little to the influence of signal with the non-perpendicularity of optical axis, and, because the string of code-disc 3 rotating shafts is moving and the end jumping of the shaft shoulder causes that the variation in this gap is bigger to effect of signals; Greatly then the Moire fringe contrast is little in the gap, signal difference, even can not work.Therefore, the adjustment in gap is very difficult.And the adjustment in gap is the important procedure of photoelectric encoder assembling, causes the assembling difficulty.So behind the cancellation slit 4, this operation also is cancelled.Only need to adjust the position relation of slit photoelectric cell 9 and code-disc 3, and this adjustment is simple relatively.The employing of slit photoelectric cell 9 helps the large-scale production of photoelectric encoder.
Description of drawings
Fig. 1 is existing incremental optical-electricity encoder structural representation.Fig. 2 is the narrow slit structure synoptic diagram in the existing incremental optical-electricity encoder.Fig. 3 is groove size, shape, the phase relation enlarged diagram on the slit that has now in the incremental optical-electricity encoder.Fig. 4 be in the existing incremental optical-electricity encoder photoelectric cell and on Moire fringe imaging synoptic diagram.Fig. 5 is the present invention's a slit photoelectric cell for incremental photoelectric encoder structural representation.Fig. 6 is two slit photoelectric cell for incremental photoelectric encoder serial user mode enlarged diagrams that obtain main signal A respectively, declare the present invention of phase signals B, and this figure double as is a Figure of abstract.Fig. 7 is the incremental optical-electricity encoder structural representation that adopts the present invention's slit photoelectric cell.Fig. 8 is obtaining main signal A respectively, declaring slit photoelectric cell for incremental photoelectric encoder parallel-connection structure and the parallel user mode synoptic diagram of phase signals B of the present invention.Fig. 9 is obtaining main signal A respectively, declaring slit photoelectric cell for incremental photoelectric encoder parallel-connection structure and the parallel user mode enlarged diagram of phase signals B of the present invention.Figure 10 is two parallel user mode synoptic diagram of slit photoelectric cell for incremental photoelectric encoder that obtain main signal A respectively, declare the present invention of phase signals B.Figure 11 is two parallel user mode enlarged diagrams of slit photoelectric cell for incremental photoelectric encoder that obtain main signal A respectively, declare the present invention of phase signals B.
Embodiment
The present invention is achieved in that specifically and sees Fig. 5, shown in Figure 6 that slit photoelectric cell 9 is made of some groove shape photoelectric cell bars 10.The material that groove shape photoelectric cell bar 10 adopts is identical with existing photoelectric cell 5, as photoelectricity volt type silicon photocell.Some groove shape photoelectric cell bars 10 are arranged side by side, are electrically connected to each other, at a distance of a pitch P.The size of groove shape photoelectric cell bar 10, shape, phase relation are identical with groove on the slit 4.The present invention's slit photoelectric cell for incremental photoelectric encoder also has two or more slit photoelectric cell 9 same-phase parallel-connection structures, sees Fig. 8, shown in Figure 9.That is to say for the main signal A in the incremental optical-electricity encoder and declare phase signals B, perhaps respectively use a slit photoelectric cell 9, perhaps respectively use two or more same-phases and slit photoelectric cell 9 parallel with one another, but, be used to form main signal A and be used to form the slit photoelectric cell 9 of declaring phase signals B and still differ
1/
4P.The signal intensity height that scheme in parallel forms.No matter be a slit photoelectric cell 9 or 9 parallel connections of a plurality of slit photoelectric cell, for main signal A with declare phase signals B, all can or on a code channel serial use, see shown in Figure 6ly, perhaps parallel use the on a code channel seen Figure 10, shown in Figure 11.The parallel use owing to being in the less illumination range, so the signal that forms is even, the signal quality height.In parallel and parallel being used to form main signal A and being used to form the slit photoelectric cell 9 of declaring phase signals B of using is alternately distributed, and sees Fig. 8, shown in Figure 9.A plurality of slit photoelectric cell 9 in parallel and parallel schemes can also reduce device volume.
Claims (3)
1. a slit photoelectric cell for incremental photoelectric encoder is characterized in that, slit photoelectric cell (9) is made of some groove shape photoelectric cell bars (10), and some groove shape photoelectric cell bars (10) are arranged side by side, is electrically connected to each other, at a distance of a pitch P.
2. slit photoelectric cell according to claim 1, it is characterized in that, described slit photoelectric cell has two or more slit photoelectric cells (9) same-phase parallel-connection structure, and, be used to form main signal A and be used to form the slit photoelectric cell (9) of declaring phase signals B and still differ 1/4P.
3. slit photoelectric cell according to claim 2 is characterized in that, in parallel and parallel being used to form main signal A and being used to form the slit photoelectric cell (9) of declaring phase signals B of using is alternately distributed.
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| CN2010101087678A CN101769766B (en) | 2010-02-11 | 2010-02-11 | Slit photoelectric cell for incremental photoelectric encoder |
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| CN2010101087678A CN101769766B (en) | 2010-02-11 | 2010-02-11 | Slit photoelectric cell for incremental photoelectric encoder |
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| CN101769766A true CN101769766A (en) | 2010-07-07 |
| CN101769766B CN101769766B (en) | 2011-10-26 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113702705A (en) * | 2021-08-17 | 2021-11-26 | 中国工程物理研究院总体工程研究所 | Phase synchronization measurement system and measurement method for double-shaft precision centrifuge |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1360198A (en) * | 2001-10-30 | 2002-07-24 | 中国科学院长春光学精密机械与物理研究所 | Combined multifunctional encoder |
| JP2004347382A (en) * | 2003-05-21 | 2004-12-09 | Microsignal Kk | Optical encoder |
| US20060038116A1 (en) * | 2004-08-20 | 2006-02-23 | Sharp Kabushiki Kaisha | Optical encoder and electronic equipment using the same |
| CN101021425A (en) * | 2006-02-15 | 2007-08-22 | 三丰株式会社 | Photoelectric encoder |
| JP2007248302A (en) * | 2006-03-16 | 2007-09-27 | Mitsutoyo Corp | Photoelectric incremental type encoder |
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2010
- 2010-02-11 CN CN2010101087678A patent/CN101769766B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1360198A (en) * | 2001-10-30 | 2002-07-24 | 中国科学院长春光学精密机械与物理研究所 | Combined multifunctional encoder |
| JP2004347382A (en) * | 2003-05-21 | 2004-12-09 | Microsignal Kk | Optical encoder |
| US20060038116A1 (en) * | 2004-08-20 | 2006-02-23 | Sharp Kabushiki Kaisha | Optical encoder and electronic equipment using the same |
| CN101021425A (en) * | 2006-02-15 | 2007-08-22 | 三丰株式会社 | Photoelectric encoder |
| JP2007248302A (en) * | 2006-03-16 | 2007-09-27 | Mitsutoyo Corp | Photoelectric incremental type encoder |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113702705A (en) * | 2021-08-17 | 2021-11-26 | 中国工程物理研究院总体工程研究所 | Phase synchronization measurement system and measurement method for double-shaft precision centrifuge |
| CN113702705B (en) * | 2021-08-17 | 2024-04-09 | 中国工程物理研究院总体工程研究所 | Synchronous measurement system and method for phase of double-shaft precise centrifugal machine |
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