US3799645A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Illumination equipment for microscopes
Assignee: Ernst Leitz Wetzlar GmbH
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Filing: 1972-03-30
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Granted: 1974-03-26
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Expires: 1992-03-30
Abstract
Abstract In an illumination equipment for microscopes comprising among other elements a lamp, a lamp aperture and an auxiliary condenser lens which may interpositioned into the light path in addition to a stationary main condenser for varying the aperture of the equipment the improvement comprises a lens element which is inserted into and/or withdrawn from the light path upon interpositioning the auxiliary condenser lens. It is thereby achieved that the position of the image of both the lamp and the lamp aperture remains stationary when the aperture of the equipment is varied, thus eliminating the necessity for refocusing the image of the lamp aperture into the object plane and the image of the lamp into infinity.
Inventors
- 👤 H Stankewitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:41
CPC Classifications
G; G02; G02B; G02B21/00; G02B21/06; G02B21/08
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
243 words
Illumination equipment for microscopes having: a stationary lamp projecting light having an optical axis; a fixedly mounted collector lens arranged adjacent said stationary lamp along said optical axis; a field diaphragm located along said optical axis through which the light from said collector lens passes; a fixedly mounted aperture diaphragm located along said optical axis through which the light from said field diaphragm passes; a fixedly mounted main condenser lens located along said optical axis through which the light from said aperture diaphragm passes; an auxiliary condenser lens selectively located along said optical axis through which the light from said main condenser lens passes, said main condenser lens and said auxiliary condenser lens projecting an image of said field diaphragm into an object plane located along said optical axis and having a back focal plane coincident with said aperture diaphragm for adapting said aperture diaphragm to an aperture of a microscope objective; an additional collecting lens element selectively located along said axis in the light path between said field diaphragm and said main condenser for maintaining positions of images of said field diaphragm and of said lamp in relationship to said selective location of said auxiliary condenser lens; an additional aperture diaphragm selectively located along said optical axis through which the light from said additional collecting lens element passes; and means for alternatively inserting said auxiliary condenser lens and said additional lens element coupled with said additional aperture diaphragm into said optical axis.
Claim 2
Dependent Claim
243 words
Illumination equipment for microscopes having: a stationary lamp projecting light having an optical axis; a fixedly mounted collector lens arranged adjacent said stationary lamp along said optical axis; a field diaphragm located along said optical axis through which the light from said collector lens passes; a fixedly mounted aperture diaphragm located along said optical axis through which the light from said field diaphragm passes; a fixedly mounted main condenser lens located along said optical axis through which the light from said aperture diaphragm passes; an auxiliary condenser lens selectively located along said optical axis through which the light from said main condenser lens passes, said main condenser lens and said auxiliary condenser lens projecting an image of said field diaphragm into an object plane located along said optical axis and having a back focal plane coincident with said aperture diaphragm for adapting said aperture diaphragm to an aperture of a microscope objective; an additional collecting lens element selectively located along said axis in the light path between said field diaphragm and said main condenser for maintaining positions of images of said field diaphragm and of said lamp in relationship to said selective location of said auxiliary condenser lens; an additional aperture diaphragm selectively located along said optical axis through which the light from said additional collecting lens element passes; and means for alternatively inserting said auxiliary condenser lens and said additional lens element coupled with said additional aperture diaphragm into said optical axis.
Claim 3
Dependent Claim
41 words
The illumination equipment of claim 1, wherein said means for alternatively inserting is a pivoted rod having a first end connected to said auxiliary condenser lens and a second end connected to said additional lens element and said additional aperture diaphragm.
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) | 1977-03-25 | 1977-09-24 | 1978-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-25 | 1981-09-24 | 1982-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-25 | 1985-09-24 | 1986-03-26 | $7700.00 | Window Closed / Lapsed |