US5166723A — Camera shake detecting device

Claim 1

Independent Claim 291 words

A camera shake detecting device to be attached to an active type auto-focusing camera which provides a distance measuring device for measuring a distance to a pictured object by receiving a beam from light projecting means reflected by the pictured object at light receiving means, comprising: filter means for inputting a receiving output which corresponds to field luminance given from said light receiving means, when said distance measuring device fails to perform measurement detections, and for transmitting frequency components due to camera shake in the receiving output without attenuating and for attenuating frequency components higher than the frequency components due to camera shake; a variable gain amplifier for inputting an output of said filter means; a gain control circuit for inputting the output of said filter means, for detecting a mean light volume level of a field luminance from the output of said filter means, and for controlling a gain of said variable gain amplifier in accordance with the mean light volume level so that an amplitude of the frequency components due to camera shake fail to be affected by brightness of the field; camera shake detection signal output means for inputting an output of said variable gain amplifier, for detecting existance or absence of the amplitude of the frequency components due to camera shake in the output of said variable gain amplifier, and for giving a camera shake detecting signal when the amplitude of the frequency components due to camera shake is detected; and camera shake warning means for inputting an output of said camera shake detection signal output means, and for issuing a camera shake warning when the camera shake detection signal is given from said camera shake detection signal output means at least while a shutter is opened.

Claim 2

Dependent Claim 291 words

A camera shake detecting device to be attached to an active type auto-focusing camera which provides a distance measuring device for measuring a distance to a pictured object by receiving a beam from light projecting means reflected by the pictured object at light receiving means, comprising: filter means for inputting a receiving output which corresponds to field luminance given from said light receiving means, when said distance measuring device fails to perform measurement detections, and for transmitting frequency components due to camera shake in the receiving output without attenuating and for attenuating frequency components higher than the frequency components due to camera shake; a variable gain amplifier for inputting an output of said filter means; a gain control circuit for inputting the output of said filter means, for detecting a mean light volume level of a field luminance from the output of said filter means, and for controlling a gain of said variable gain amplifier in accordance with the mean light volume level so that an amplitude of the frequency components due to camera shake fail to be affected by brightness of the field; camera shake detection signal output means for inputting an output of said variable gain amplifier, for detecting existance or absence of the amplitude of the frequency components due to camera shake in the output of said variable gain amplifier, and for giving a camera shake detecting signal when the amplitude of the frequency components due to camera shake is detected; and camera shake warning means for inputting an output of said camera shake detection signal output means, and for issuing a camera shake warning when the camera shake detection signal is given from said camera shake detection signal output means at least while a shutter is opened.

Claim 3

Dependent Claim 54 words

The device of claim 1, wherein said filter means includes switching means which is switched on in response to an end of distance measurement and switched off in response to an end of exposure, and said filter means inputs the receiving output of said light receiving means when said switching means is switched on.

Claim 4

Dependent Claim 78 words

The device of claim 1, wherein said camera shake detection signal output means includes a limiter for inputting the output of said variable gain amplifier and for removing signals with the frequency components higher than the frequency components due to camera shake, and a window comparator for inputting an output of said limiter and for giving the camera shake detection signal when the output of said limiter contains signals with an amplitude larger than a window width thereof.

Claim 5

Dependent Claim 46 words

The device of claim 3, wherein the window width of said window comparator is varied, according to a focal length of a taking lens, so the window width is narrowed as the taking lens is operated from a short focus side to a long focus side.

Claim 6

Dependent Claim 103 words

The device of claim 1, wherein said camera shake warning means includes first gate means for inputting the output of said camera shake detection signal output means and for passing the camera shake detection signal when the camera shake detection signal is given from said camera shake detection signal output means while the shutter is opened, and first camera shake display means for inputting an output of said first gate means and for displaying, when the camera shake detection signal is given from said first gate means, that a camera shake was caused during the shutter open period at an end of exposure.

Claim 7

Dependent Claim 63 words

The device of claim 1, wherein said camera shake warning means issues the camera shake warning when the camera shake detection signal is given from said camera shake detection signal output means while the shutter is opened, and issues a camera shake warning when the camera shake detection signal is given from said camera shake detection signal output means during a focus lock.

Claim 8

Dependent Claim 186 words

The device of claim 1, wherein said camera shake warning means includes first gate means for inputting the output of said camera shake detection signal output means and for passing the camera shake detection signal when the camera shake detection signal is given from said camera shake detection signal output means during the shutter open period, first camera shake display means for inputting an output of said first gate means, and for displaying that a camera shake was caused during the shutter open period, after an end of exposure, when the camera shake detection signal is given from said first gate means, second gate means for inputting the output of said camera shake detection signal output means, and for passing the camera shake detection signal when the camera shake detection signal is given from said camera shake detection signal output means during a focus lock, and second camera shake display means for inputting an output of said second gate means, and for displaying, during the focus lock, that a camera shake is caused when the camera shake detection signal is given from said second gate means.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1995-11-24	1996-05-25	1996-11-24	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1999-11-24	2000-05-25	2000-11-24	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2003-11-24	2004-05-25	2004-11-24	$7700.00	Window Closed / Lapsed

Camera shake detecting device

Abstract

Inventors

Bibliographic Details

Claims Analysis

References Cited (Backward Citations)

USPTO Annuity & Maintenance Windows

Assigned Categories & Tags

Assign Category Tag