Patent EP0394901A2 successfully refreshed from Google Patents.
EP0394901A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Optical lens control device
Assignee: Canon Inc
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Filing: 1990-04-23
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Granted: —
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Expires: 2010-04-23
Abstract
Abstract An optical apparatus comprises a first lens to be used for changing a magnifying power; a second lens to be used for focus adjustment and also for compensation required when the magnifying power is varied; a focus detecting circuit for detecting an in-focus state; a first control circuit for driving the second lens to an in-focus position on the basis of information obtained by the focus detecting circuit; a detecting circuit for detecting the position of the second lens; and a second control circuit for driving the second lens to a normal focus adjustable position after driving the second lens to a reset position for the purpose of enabling the detecting circuit to perform a detecting action. The second control circuit is arranged to drive the second lens from the reset position to the focus adjustable position at a higher speed than the driving speed set by the first control circuit.
Inventors
- 👤 Ushiro C/O Tamagawa Jigyosho Tatsuzo
- 👤 Kaneda C/O Tamagawa Jigyosho Naoya
- 👤 Wada C/O Tamagawa Jigyosho Hiroyuki
- 👤 Hirasawa C/O Tamagawa Jigyosho Masahide
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 19:29
CPC Classifications
G; G02; G02B; G02B7/00; G02B7/02; G02B7/04; G02B7/10; G02B7/102; G02B7/28; G02B7/282
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
169 words
An optical apparatus comprising: a) a first lens arranged to perform a magnifying power varying action; b) a second lens arranged to perform a focusing action and a compensating action which is required when the power varying action is performed; c) focus detecting means for detecting a focused state; d) first control means for driving said second lens on the basis of information from said focus detecting means in such a way as to obtain an in-focus state; e) detecting means for detecting a state of said second lens; and f) second control means for enabling said detecting means to perform the detecting action thereof by driving said second lens into a normal focus adjustable state after driving said second lens to a reset state, said second control means being arranged to set a lens driving speed at which said second lens is to be driven from said reset state to said focus adjustable state at a higher speed than a driving speed set by said first control means.
Claim 2
Dependent Claim
169 words
An optical apparatus comprising: a) a first lens arranged to perform a magnifying power varying action; b) a second lens arranged to perform a focusing action and a compensating action which is required when the power varying action is performed; c) focus detecting means for detecting a focused state; d) first control means for driving said second lens on the basis of information from said focus detecting means in such a way as to obtain an in-focus state; e) detecting means for detecting a state of said second lens; and f) second control means for enabling said detecting means to perform the detecting action thereof by driving said second lens into a normal focus adjustable state after driving said second lens to a reset state, said second control means being arranged to set a lens driving speed at which said second lens is to be driven from said reset state to said focus adjustable state at a higher speed than a driving speed set by said first control means.
Claim 3
Dependent Claim
27 words
An apparatus according to claim 1, wherein said first and second control means are arranged to drive said second lens in the direction of an optical axis.
Claim 4
Dependent Claim
31 words
An apparatus according to claim 2, wherein said first and second control means are arranged to drive said second lens in the direction of the optical axis by using a motor.
Claim 5
Dependent Claim
20 words
An apparatus according to claim 2, wherein said detecting means is arranged to detect the position of said second lens.
Claim 6
Dependent Claim
32 words
An apparatus according to claim 4, wherein information on the position detected by said detecting means is obtained from an extent to which said second lens is moved from a reset position.
Claim 7
Dependent Claim
21 words
An apparatus according to claim 3, wherein said second control means is arranged to control the rotating speed of said motor.
Claim 8
Dependent Claim
36 words
An apparatus according to claim 2, wherein said first control means is arranged to drive said second lens toward an in-focus position on the basis of information about the positions of said first and second lenses.
Claim 9
Dependent Claim
40 words
An apparatus according to claim 3, wherein said second control means is arranged to drive said second lens from a reset position toward an in-focus position on the basis of information about the positions of said first and second lenses.
Claim 10
Dependent Claim
39 words
An apparatus according to claim 8, further comprising third control means arranged to cause said second lens to be moved by said motor according to the movement of said first lens for the purpose of retaining an in-focus state.
Claim 11
Dependent Claim
34 words
An apparatus according to claim 9, wherein the rotating speed of said motor set by said second control means is faster than the rotating speed of said motor set by said third control means.
Claim 12
Dependent Claim
44 words
An apparatus according to claim 1, further comprising inhibiting means for inhibiting the magnifying power varying action of said first lens while said second lens is caused by said second control means to be driven from said reset state to said focus adjustable state.
Claim 13
Dependent Claim
73 words
An optical apparatus comprising: a) a movable lens; b) detecting means for detecting the position of said movable lens, said detecting means being arranged to obtain information on the position of said movable lens from an extent to which said movable lens is moved from a reset position; and c) control means for compulsively moving said movable lens to said reset position when the power supply of said optical apparatus is turned off.
Claim 14
Dependent Claim
73 words
An optical apparatus comprising: a) a movable lens; b) detecting means for detecting the position of said movable lens, said detecting means being arranged to obtain information on the position of said movable lens from an extent to which said movable lens is moved from a reset position; and c) control means for compulsively moving said movable lens to said reset position when the power supply of said optical apparatus is turned off.
Claim 15
Dependent Claim
20 words
An optical apparatus according to claim 12, wherein said movable lens is a lens arranged to vary a magnifying power.
Claim 16
Dependent Claim
30 words
An apparatus according to claim 12, wherein said movable lens is arranged to perform both a focus adjusting action and a compensating action required when a magnifying power is varied.
Claim 17
Dependent Claim
28 words
An apparatus according to claim 12, wherein said control means includes a microcomputer, and wherein said movable lens is moved to said reset position according to a program.
Claim 18
Dependent Claim
47 words
An optical apparatus comprising: a) a movable lens; b) storing means for storing a position of said movable lens; and c) control means for causing, after a resetting operation of said movable lens, said movable lens to be moved to said position stored by said storing means.
Claim 19
Dependent Claim
47 words
An optical apparatus comprising: a) a movable lens; b) storing means for storing a position of said movable lens; and c) control means for causing, after a resetting operation of said movable lens, said movable lens to be moved to said position stored by said storing means.
Claim 20
Dependent Claim
19 words
An apparatus according to claim 16, wherein said movable lens is a lens arranged to vary a magnifying power.
Claim 21
Dependent Claim
15 words
An apparatus according to claim 16, wherein said movable lens is a lens for focusing.
Claim 22
Dependent Claim
47 words
An apparatus according to claim 16, further comprising detecting means for detecting the position of said movable lens, said detecting means being arranged to obtain information on the position of said movable lens from an extent to which said movable lens is moved from a reset position.
Claim 23
Dependent Claim
31 words
An apparatus according to claim 16, wherein said storing means is arranged to store information on the position of said movable lens obtained immediately before a power supply is turned off.
Claim 24
Dependent Claim
23 words
An apparatus according to claim 19, wherein said storing means is arranged to store information on said position obtained by said detecting means.
Claim 25
Dependent Claim
35 words
An apparatus according to claim 20, wherein said control means is arranged to cause, when said power supply is turned on, said movable lens to be moved to said position stored by said storing means.
Claim 26
Dependent Claim
26 words
An apparatus according to claim 21, wherein said control means includes a microcomputer, and wherein said movable lens is moved and controlled according to a program.
Claim 27
Dependent Claim
16 words
An apparatus according to claim 23, wherein a nonvolatile memory is employed as said storing means.
Claim 28
Dependent Claim
31 words
An apparatus according to claim 16, further comprising inhibiting means for inhibiting said control means from causing said movable lens to be moved to said position stored by said storing means.
References Cited (Backward Citations)
No citation records indexed.
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