US4775238A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical web monitoring apparatus
Assignee: Erwin Sick GmbH Optik Elektronik
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Filing: 1986-08-27
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Granted: 1988-10-04
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Expires: 2006-08-27
Abstract
Abstract An optical web monitoring apparatus has an illuminating arrangement which images the pupil of the source of illumination into the observing pupil of the camera objective (18) of a diode row camera using a strip-like concave mirror (14), or two strip-like concave mirrors (14, 15), and thus achieves the maximum attainable light yield. The construction is realized such that a fault seeking apparatus with a laser scanner can be used at the same time using the same mirror strips (14, 15). Thus two monitoring operations can be carried out simultaneously.
Inventors
- 👤 Klaus Weber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:52
CPC Classifications
G; G02; G02B; G02B26/00; G02B26/08; G02B26/10; G02B26/12; G02B26/125; G02B26/126; G01; G01N; G01N21/00; G01N21/84; G01N21/88; G01N21/89; G01N21/8901; G01N21/8903
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
204 words
An optical web monitoring apparatus comprising: an illumination arrangement including a light source, and a transmitter-side strip-like concave mirror illuminated by said light source, for generating a strip of illumination on a surface of a moving elongated web spaced from the transmitter-side concave mirror, the strip of illumination extending transverse to the longitudinal direction of the web, a light receiving arrangment including an optical system, a photo-receiver arrangment formed by a line of diodes, and an electronic processing circuit, said light receiving arrangement projecting light emerging from the strip of illumination via said optical system onto said photoreceiver arrangement which delivers electrical signals corresponding to the received light to said electronic processing circuit, said transmitter-side concave mirror forming an image of an entry pupil of a total beam path from said light source at a location within the beam path extending from the light source to the photoreceiver arrangement, at a substantial distance behind the strip of illumination, in an objective located in front of the line of diodes, the objective imaging the strip of illumination onto the line of diodes in such a way that the strip-like image of the strip of illumination extends in the longitudinal direction of the line of diodes.
Claim 2
Dependent Claim
204 words
An optical web monitoring apparatus comprising: an illumination arrangement including a light source, and a transmitter-side strip-like concave mirror illuminated by said light source, for generating a strip of illumination on a surface of a moving elongated web spaced from the transmitter-side concave mirror, the strip of illumination extending transverse to the longitudinal direction of the web, a light receiving arrangment including an optical system, a photo-receiver arrangment formed by a line of diodes, and an electronic processing circuit, said light receiving arrangement projecting light emerging from the strip of illumination via said optical system onto said photoreceiver arrangement which delivers electrical signals corresponding to the received light to said electronic processing circuit, said transmitter-side concave mirror forming an image of an entry pupil of a total beam path from said light source at a location within the beam path extending from the light source to the photoreceiver arrangement, at a substantial distance behind the strip of illumination, in an objective located in front of the line of diodes, the objective imaging the strip of illumination onto the line of diodes in such a way that the strip-like image of the strip of illumination extends in the longitudinal direction of the line of diodes.
Claim 3
Dependent Claim
37 words
An apparatus in accordance with claim 1, wherein a point light source is arranged at the entry pupil for generating the strip of illumination via said transmitter-side concave mirror which is vignetted transverse to its longitudinal direction.
Claim 4
Dependent Claim
57 words
An apparatus in accordance with claim 1, wherein a point light source is imaged via a strip-like condensing concave mirror extending optically parallel to the transmitter-side concave. mirror at an aperture diaphragm arranged at the location of the entry pupil; the light emerging through the aperture diaphragm generating the strip of illimination via the transmitter-side concave mirror.
Claim 5
Dependent Claim
19 words
An apparatus in accordance with claim 1, without optical image forming elements between the concave mirror and the objective.
Claim 6
Dependent Claim
31 words
An apparatus in accordance with claim 3, wherein the strip of illumination is located approximately between 1/3 to 1/2 of the beam path between the transmitter-side concave mirror and the objective.
Claim 7
Dependent Claim
20 words
An optical web monitoring apparatus according to claim 1, comprising further optical image forming means in addition to said objective.
Claim 8
Dependent Claim
24 words
An apparatus in accordance with claim 6, wherein the further optical image forming includes a receiver-sde strip-like concave mirror in the light receiving arrangement.
Claim 9
Dependent Claim
24 words
An apparatus in accordance with claim 7, wherein the receiver-side strip-like concave mirror has a focal lenght equalling that of the transmitter-side concave mirror.
Claim 10
Dependent Claim
24 words
An apparatus in accordance with claim 7, the beam path between the transmitter-side concave mirror and the receiver-side concave mirror extends in parallel manner.
Claim 11
Dependent Claim
33 words
An apparatus in accordance with claim 6, comprising a line-like light source imaged via a condensor and the transmitter-side concave mirror onto the surface of the web to form the strip of illumination.
Claim 12
Dependent Claim
20 words
An apparatus in accordance with claim 1, wherein the strip of illumination extends across the whole width of the web.
Claim 13
Dependent Claim
20 words
An apparatus in accordance with claim 6, wherein the strip of illumination extends across the whole width of the web.
Claim 14
Dependent Claim
75 words
An apparatus in accordance with claim 7, comprising a beam divider between the entry pupil and the transmitter-side concave mirror; a mirror wheel or a rotary mirror arraanged at a distance from the transmitter-side concave mirror corresponding to the focal length thereof, and a laser for generating a scanning beam which reaches the transmitter-side concave mirror from where the scanning beam is projected obliquely onto the web in the region of the strip of illumination.
Claim 15
Dependent Claim
45 words
An apparatus in accordance with claim 7, comprising a beam divider between the receiver-side concave mirror and the objective for dividing the received beam into a first beam to the objective and a second beam deflected onto a photoreceiver connected to the electronic processing circuit.
Claim 16
Dependent Claim
13 words
An apparatus in accordance with claim 14, wherein said photoreceiver is a photo-multiplier.
Claim 17
Dependent Claim
33 words
An apparatus in accordance with claim 14, comprising optical filters tuned to non-overlapping spectral ranges, between the beam divider, and respectively the objective and the photoreceiver, for decoupling the first and second beams.
Claim 18
Dependent Claim
34 words
An apparatus in accordance with claim 14, comprising diachromatic dividing mirrors tuned to non-overlapping spectral ranges, between the beam divider, and respectively the objective and the photoreceiver, for decoupling the first and second beams.
Claim 19
Dependent Claim
37 words
An apparatus in accordance with claim 14, comprising optical filters and diachromatic dividing mirrors tuned to non-overlapping spectral ranges, between the beam divider, and respectively the objective and the photoreceiver, for decoupling the first and second beams.
Claim 20
Dependent Claim
25 words
An apparatus in accordance with claim 1, wherein the ratio of the image of the entry pupil in the objective amounts to 0.5:1 to 1:2.
Claim 21
Dependent Claim
25 words
An apparagus in accordance with claim 6, wherein the ratio of the image of the entry pupil in the objective amounts to 0.5:1 to 1:2.
Claim 22
Dependent Claim
19 words
An apparatus in accordance with claim 6, comprising at least one plane, strip-like deflecting mirror in the beam path.
Claim 23
Dependent Claim
24 words
An apparatus in accordance with claim 6, comprising a plurality of diaphragms matched to one another in the entry pupil and in the objective.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-10-04 | 1992-04-04 | 1992-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-04 | 1996-04-04 | 1996-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-04 | 2000-04-04 | 2000-10-04 | $7700.00 | Window Closed / Lapsed |