US5067802A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lens movement control device for zoom lens
Assignee: Canon Inc
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Filing: 1990-10-16
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Granted: 1991-11-26
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Expires: 2010-10-16
Abstract
Abstract A zoom lens comprises a varifocal lens section having a variator lens unit for varying the focal length of the entire system and a compensator lens unit for compensating for the image shift with zooming movement of the variator lens unit, a relay lens section using a light beam from the varifocal lens section for forming an object image on a predetermined plane, a lens unit constituting at least part of the relay lens section being made to be an axially movable adjusting lens unit, and a focus adjusting mechanism for axially moving the adjusting lens unit to effect focus adjustment, wherein information about the focus deviation with variation of the focal length by the varifocal lens section is obtained in each focal length position and memorized in a memory, whereby the focus adjustment is carried out in such a way that the predetermined focus deviation information is selected from the memory based on a signal output from a focal length detecting circuit for detecting the zooming position of the varifocal lens section, the amount of movement of the adjusting lens unit is computed by a computing circuit based on the selected focus deviation information and the signal output from an adjusting lens unit detecting circuit for detecting the axial position of the adjusting lens unit, and the adjusting lens unit is moved by a drive device based on a signal output from the computing circuit.
Inventors
- 👤 Kanjyo Orino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:13
CPC Classifications
G; G02; G02B; G02B7/00; G02B7/02; G02B7/04; G02B7/10; G02B7/102
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
151 words
A lens movement control device for a zoom lens having variable focal lengths, comprising: photographic lens means having first and second lens units axially movable for zooming, and a relay lens unit having a plurality of lens components to form an image with a light beam coming from said first and second lens units; drive means for axially moving at least one lens component of said plurality of lens components; first detecting means for detecting a focal length; second detecting means for detecting the position of said at least one lens component; memory means for memorizing information about the movement of said at least one lens component for each focal length; and control means for controlling said drive means on the basis of information memorized by said memory means corresponding to the focal length detected by said first detecting means and information about the position detected by said second detecting means.
Claim 2
Dependent Claim
151 words
A lens movement control device for a zoom lens having variable focal lengths, comprising: photographic lens means having first and second lens units axially movable for zooming, and a relay lens unit having a plurality of lens components to form an image with a light beam coming from said first and second lens units; drive means for axially moving at least one lens component of said plurality of lens components; first detecting means for detecting a focal length; second detecting means for detecting the position of said at least one lens component; memory means for memorizing information about the movement of said at least one lens component for each focal length; and control means for controlling said drive means on the basis of information memorized by said memory means corresponding to the focal length detected by said first detecting means and information about the position detected by said second detecting means.
Claim 3
Dependent Claim
26 words
A device according to claim 1, further comprising a cam member having predetermined camming slots for controlling the movement of said first and second lens units.
Claim 4
Dependent Claim
52 words
A device according to claim 1, further comprising a diaphragm in cooperation with said photographic lens means and third detecting means for detecting the size of aperture opening of said diaphragm, and wherein said control means controls said drive means further on the basis of information detected by said third detecting means.
Claim 5
Dependent Claim
29 words
A device according to claim 1, wherein said photographic lens means further has a lens unit axially movable for focusing in front of said first and second lens units.
Claim 6
Dependent Claim
165 words
A lens movement control device for a zoom lens having variable focal lengths comprising: photographic lens means having first and second lens units axially movable for zooming, and a relay lens unit having a plurality of lens components for forming an image with a light beam coming from said first and second lens units; drive means for axially moving at least one lens component of said plurality of lens components; a diaphragm; first detecting means for detecting the size of aperture opening of said diaphragm; second detecting means for detecting the position of said at least one lens component; memory means for memorizing information about the movement of said at least one lens component for each size of aperture opening of said diaphragm; and control means for controlling said drive means on the basis of information memorized by said memory means corresponding to the size of aperture opening detected by said first detecting means and information about the position detected by said second detecting means.
Claim 7
Dependent Claim
165 words
A lens movement control device for a zoom lens having variable focal lengths comprising: photographic lens means having first and second lens units axially movable for zooming, and a relay lens unit having a plurality of lens components for forming an image with a light beam coming from said first and second lens units; drive means for axially moving at least one lens component of said plurality of lens components; a diaphragm; first detecting means for detecting the size of aperture opening of said diaphragm; second detecting means for detecting the position of said at least one lens component; memory means for memorizing information about the movement of said at least one lens component for each size of aperture opening of said diaphragm; and control means for controlling said drive means on the basis of information memorized by said memory means corresponding to the size of aperture opening detected by said first detecting means and information about the position detected by said second detecting means.
Claim 8
Dependent Claim
26 words
A device according to claim 5, further comprising a cam member having predetermined camming slots for controlling the movement of said first and second lens units.
Claim 9
Dependent Claim
37 words
A device according to claim 5, further comprising third detecting means for detecting a focal length, and wherein said control means controls said drive means further on the basis of information detected by said third detecting means.
Claim 10
Dependent Claim
29 words
A device according to claim 5, wherein said photographic lens means further has a lens unit axially movable for focusing in front of said first and second lens units.
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) | 1994-11-25 | 1995-05-27 | 1995-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-11-25 | 1999-05-27 | 1999-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-11-25 | 2003-05-27 | 2003-11-26 | $7700.00 | Window Closed / Lapsed |