US4625103A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic focusing device in microscope system
Assignee: Pentax Corp
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Filing: 1983-11-30
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Granted: 1986-11-25
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Expires: 2003-11-30
Abstract
Abstract An automatic focusing device for vertical focusing of a specimen 23 in which an enlarging condenser lens 11 is placed between a light source 12 and a half mirror 7 in an automatic focus detecting system so that an enlarged image 24 of the light source is presented to an objective 1 of the focusing microscope M.
Inventors
- 👤 Goro Kitamura
- 👤 Hidenori Horiuchi
- 👤 Masaaki Aoyama
- 👤 Tokuhisa Ito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:23
CPC Classifications
G; G02; G02B; G02B21/00; G02B21/24; G02B21/241; G02B21/245; G02B21/247
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
136 words
A focusing device, comprising: a diverging light source; an enlarging condenser lens receiving light from the light source; a first half mirror disposed on a side of an enlarged image point of said light source, said side being opposite a side of said image point facing the condenser lens; an objective receiving light from said first half mirror for illuminating a portion of a specimen to be focused; a second half mirror for receiving light reflected from said specimen back through said objective from said first half mirror, thereby creating two half beams; a first detector for receiving a first of said half beams, located beyond a focus point of said first half beam; and a second detector for receiving a second of said half beams, located before a focus point of said second half beam.
Claim 2
Dependent Claim
136 words
A focusing device, comprising: a diverging light source; an enlarging condenser lens receiving light from the light source; a first half mirror disposed on a side of an enlarged image point of said light source, said side being opposite a side of said image point facing the condenser lens; an objective receiving light from said first half mirror for illuminating a portion of a specimen to be focused; a second half mirror for receiving light reflected from said specimen back through said objective from said first half mirror, thereby creating two half beams; a first detector for receiving a first of said half beams, located beyond a focus point of said first half beam; and a second detector for receiving a second of said half beams, located before a focus point of said second half beam.
Claim 3
Dependent Claim
17 words
A focusing device, as recited in claim 1, wherein said light source is an infrared light-emitting diode.
Claim 4
Dependent Claim
34 words
An automatic focusing device, as recited in claim 1, further comprising automatic focusing circuitry receiving signals from said first and second detectors for automatically providing an indication of the vertical focusing of said specimen.
Claim 5
Dependent Claim
35 words
An automatic focusing device, as recited in claim 3, further comprising: a vertically movable stage on which said specimen is mounted; and driving means controlled by said automatic focusing circuitry for vertically moving said stage.
Claim 6
Dependent Claim
18 words
An automatic focusing device, as recited in claim 4, wherein said light source is an infrared light-emitting diode.
Claim 7
Dependent Claim
35 words
An automatic focusing device, as recited in claim 4, wherein said automatic focusing circuitry includes means for comparing said signals from said first and second detectors to thereby form said indication of the vertical focusing.
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) | 1989-11-24 | 1990-05-26 | 1990-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-11-24 | 1994-05-26 | 1994-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-11-24 | 1998-05-26 | 1998-11-25 | $7700.00 | Window Closed / Lapsed |