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US3589811A
Expired / Lapsed
US
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Apparatus for splitting up a polychromatic light beam into three component monochromatic beams
Assignee: MEMO INTERNATIONAL ESTABLISHME
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Filing: 1968-12-11
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Granted: 1971-06-29
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Expires: 1988-12-11
Abstract
Abstract In the production of three monochromatic images on photosensitive surfaces by splitting up a polychromatic light beam into three component monochromatic beams, a nondeformable compact optical unit is provided having two dichroic filters arranged in cross formation for splitting up the polychromatic beam into three monochromatic beams each directed upon one sensitive surface in front of which an interference filter is arranged. The polychromatic beam is split up by the dichroic filters by dividing the visible spectrum thereof into three passbands situated tangent to one another without mutual overlap.
Inventors
- 👤 Michel Berger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:45
CPC Classifications
G; G03; G03B; G03B33/00
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
93 words
Photographic apparatus for producing three monochromatic images on photosensitive surfaces, comprising two dichroic filters to split a polychromatic beam into three component monochromatic beams, three interference filters, each of which is placed in front of an associated photosensitive surface on which an image is to be formed by one of the monochromatic beams, an optical and image-recording portion formed by a homogeneous, nondeformable unit including means for positioning the various filters, and means for subjecting the filters to constant pressure, said filters being positioned with an accuracy of the order of a micron.
Claim 2
Dependent Claim
93 words
Photographic apparatus for producing three monochromatic images on photosensitive surfaces, comprising two dichroic filters to split a polychromatic beam into three component monochromatic beams, three interference filters, each of which is placed in front of an associated photosensitive surface on which an image is to be formed by one of the monochromatic beams, an optical and image-recording portion formed by a homogeneous, nondeformable unit including means for positioning the various filters, and means for subjecting the filters to constant pressure, said filters being positioned with an accuracy of the order of a micron.
Claim 3
Dependent Claim
92 words
Apparatus according to claim 1, in which said optical unit is in the form of a cube, the dichroic filters being placed in cross formation inside the cube and the three interferential filters being arranged on three lateral faces of this cube, the means for positioning the dichroic filters comprising guides disposed on the inside of those faces of the cube, which extend at right angles to the filters, and the filters being laterally pressed against said guides under the action of a leaf spring and through the intermediary of angle elements.
Claim 4
Dependent Claim
80 words
Apparatus according to claim 2, in which said optical unit comprises a bottom cover plate and a top cover plate which are spaced from one another and interconnected by four upright columns, said guides being constituted by regions of increased thickness of the cover plates and being machined to an accuracy of 1 micron, and the angle elements being fixed to said cover plates in such manner that they can move in the direction of thrust exercised by said springs.
Claim 5
Dependent Claim
78 words
Apparatus according to claim 2, in which said cross formation of dichroic filters comprises a single filter and two half filters arranged diagonally in said cube, springs and spacing blocks being provided to exert tangential thrust on the outer edges of the filters, said springs acting to press said half filters from either side against the single filter and said spacing blocks being arranged to center the assembly of the cross formation with the accuracy of a micron.
Claim 6
Dependent Claim
39 words
Apparatus according to claim 4, in which the springs which exert a tangential pressure on the filters are arranged in longitudinal grooves machined in the upright columns which separate the lower and upper cover plates of the optical unit.
Claim 7
Dependent Claim
74 words
Apparatus according to claim 2, which is intended to be loaded with a film, said optical unit forming the film track along which the film is accurately guided, the three planes in which the three respective monochromatic images are formed being situated at the same distance from the optical center to the accuracy of a micron, whereby it is ensured that the three images will be strictly accurate from a mechanical point of view.
Claim 8
Independent Claim
205 words
An apparatus for producing simultaneously three monochromatic images from a polychromatic ray comprising a first dichroic filter disposed at an angle to the polychromatic rays, said first dichroic filter being adapted to reflect rays of a first frequency range and to pass rays other than the rays of said first frequency range, a second dichroic filter disposed at an angle to the polychromatic rays, said second dichroic filter being adapted to reflect rays of a second frequency range, different from said first frequency range and to pass rays other than said second frequency range, a first interference filter positioned in the path of the rays reflected from said first dichroic filter, a second interference filter positioned in the path of the rays reflected from said second dichroic filter, and a third interference filter positioned in the path of the rays that pass through said first and said second dichroic filters, the rays passing through said third interference filter having frequency ranges other than the first and second frequency ranges, said dichroic and interference filters being effective to produce rays in three frequency ranges with the rays of the respective frequency ranges having luminous energy in direct proportion to the corresponding rays of the polychromatic ray.
Claim 9
Independent Claim
205 words
An apparatus for producing simultaneously three monochromatic images from a polychromatic ray comprising a first dichroic filter disposed at an angle to the polychromatic rays, said first dichroic filter being adapted to reflect rays of a first frequency range and to pass rays other than the rays of said first frequency range, a second dichroic filter disposed at an angle to the polychromatic rays, said second dichroic filter being adapted to reflect rays of a second frequency range, different from said first frequency range and to pass rays other than said second frequency range, a first interference filter positioned in the path of the rays reflected from said first dichroic filter, a second interference filter positioned in the path of the rays reflected from said second dichroic filter, and a third interference filter positioned in the path of the rays that pass through said first and said second dichroic filters, the rays passing through said third interference filter having frequency ranges other than the first and second frequency ranges, said dichroic and interference filters being effective to produce rays in three frequency ranges with the rays of the respective frequency ranges having luminous energy in direct proportion to the corresponding rays of the polychromatic ray.
Claim 10
Dependent Claim
122 words
An apparatus as set forth in claim 7 wherein the apparatus comprises a splitting block for a photographic camera for producing simultaneously on sensitive surfaces three monochromatic images from the polychromatic ray, the block including a framework in the form of a cube supporting the filters in a relationship to obtain on the sensitive surfaces placed behind the interference filters three monochromatic images, the passing spectral band of each splitted beam forming the image occupying 1/3 of the visible spectrum and being tangent to one another, means being provided for positioning the filters and the sensitive surface in the framework so that the optical paths of the three monochromatic beams are strictly identical, the thickness filters being placed crosswise in said framework.
Claim 11
Dependent Claim
63 words
An apparatus as Set forth in claim 8, wherein the surface of at least one of the interference filters is provided with neutral grey layers in order to assure the balance of the luminous intensities of the three images as a function of the passing band, of the chromatic sensitivity of the sensitive surfaces and of the absorption factors of the optical paths.
Claim 12
Dependent Claim
59 words
An apparatus as set forth in claim 7, wherein the third interference filter is less thick than the two other interference filters, in order to render the focal lengths equal, the ratio of the thickness of said third interference filter to the thickness of the other interference filters being a function of the thickness of the two dichroic filters.
Claim 13
Dependent Claim
58 words
An apparatus as set forth in claim 8 wherein the means for positioning the dichroic filters comprises guides placed on the inside of those surfaces of the framework which extend at right angles to the filters, the filters being laterally pressed against these guides under the action of a leaf spring and through the intermediary of angle elements.
Claim 14
Dependent Claim
80 words
An apparatus as set forth in claim 11 wherein the framework comprises a bottom cover plate and a top cover plate which are spaced from each other and maintained in interconnection by four columns, said guides being of increased thickness in the cover plates and being machined to an accuracy of 1 micron, whereby the angle elements are fixed onto the cover plates in such a manner that they can move in the direction of thrust exerted by the springs.
Claim 15
Dependent Claim
40 words
An apparatus as set forth in claim 11 further including plate springs exerting a tangential thrust upon the outer edges of the dichroic filters to position the cross made by the dichroic filters in the optical center of the block.
Claim 16
Dependent Claim
40 words
An apparatus as set forth in claim 13 wherein the springs exerting a tangential pressure on the dichroic filters are placed in longitudinal grooves machined in the columns separating the bottom and the top cover plates of the optical block.
Claim 17
Dependent Claim
51 words
An apparatus as set forth in claim 12, in which the interference filters are maintained in slots provided at the lateral faces of the cube in the columns and in the bottom and top cover plates by means of the frames applied on each of the three faces of the cube.
Claim 18
Dependent Claim
88 words
An apparatus as set forth in claim 15, in which the sensitive surfaces are represented by a film, the frames retaining the interference filters forming at the same time a film track along which the film is accurately guided and maintained in place by means of press film, whereby the three formation planes of the three monochromatic images are situated at the same distance from the optical center to the accuracy of a micron, which permits a very strict identity on the mechanical plane of the three images.
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) | 1974-06-28 | 1974-12-28 | 1975-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-28 | 1978-12-28 | 1979-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-28 | 1982-12-28 | 1983-06-29 | $7700.00 | Window Closed / Lapsed |