Patent US3635214A successfully refreshed from Google Patents.
US4652107A
Expired / Lapsed
US
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Distance measuring device
Assignee: Canon Inc
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Filing: 1985-12-17
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Granted: 1987-03-24
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Expires: 2005-12-17
Abstract
Abstract A distance measuring device for a camera of the kind measuring distances to a plurality of spots within a photo-taking image plane gives accurate data of distance measurement. The device comprises in combination signal projecting means arranged to project a distance measuring signal onto the spots of the image plane one after another; signal receiving means arranged to receive a reflection signal resulting from the distance measuring signal and to produce measured distance data one after another according to the part thereof at which the reflection signal is received; and measured distance data selection means arranged to select, from among the measured distance data obtained one after another from the signal receiving means, a data fluctuating to a less degree than a predetermined value as an effective measured distance data.
Inventors
- 👤 Shuichi Tamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:24
CPC Classifications
G; G01; G01C; G01C3/00; G01C3/10; G02; G02B; G02B7/00; G02B7/28; G02B7/30; G02B7/32
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
135 words
A distance measuring device for a camera of the kind measuring distances to a plurality of spots located within a photo-taking image plane, comprising: (a) signal projecting means for projecting a distance measuring signal onto spots located within a photo-taking image plane one after another from one side to the opposite side of said image plane; (b) signal receiving means arranged to receive a reflection signal resulting from said distance measuring signal and to produce measured distance data one after another according to the part thereof at which the reflection signal is received; and (c) measured distance data selecting means arranged to select, from among the measured distance data obtained one after another from said signal receiving means, a data fluctuating to a less degree than a predetermined value as an effective measured distance data.
Claim 2
Dependent Claim
135 words
A distance measuring device for a camera of the kind measuring distances to a plurality of spots located within a photo-taking image plane, comprising: (a) signal projecting means for projecting a distance measuring signal onto spots located within a photo-taking image plane one after another from one side to the opposite side of said image plane; (b) signal receiving means arranged to receive a reflection signal resulting from said distance measuring signal and to produce measured distance data one after another according to the part thereof at which the reflection signal is received; and (c) measured distance data selecting means arranged to select, from among the measured distance data obtained one after another from said signal receiving means, a data fluctuating to a less degree than a predetermined value as an effective measured distance data.
Claim 3
Dependent Claim
31 words
A device according to claim 1, wherein said measured distance data selecting means includes sampling means for sampling the quantity of said measured distance signal received by said signal receiving means.
Claim 4
Dependent Claim
60 words
A device according to claim 2, wherein said measured distance data selecting means includes discriminating means which is arranged to compare the quantity of the measured distance signal sampled by said sampling means with that of the ensuing signal received by said receiving means after sampling, said comparison being performed on said measured distance signals one after another in rotation.
Claim 5
Dependent Claim
13 words
A device according to claim 3, wherein said sampling means includes delay means.
Claim 6
Dependent Claim
124 words
A distance measuring device for a camera of the kind measuring distances to a plurality of spots located within a photo-taking image plane, comprising: (a) signal projecting means for projecting a distance measuring signal onto spots located within a photo-taking image plane one after another from one side to the opposite side of said image plane; (b) signal receiving means arranged to receive a reflection signal resulting from said distance measuring signal and to produce measured distance data one after another according to the part thereof at which the reflection signal is received; and (c) measured distance data selecting means for voiding measured distance data fluctuating to a great degree in the measured distance data produced by said signal receiving means one after another.
Claim 7
Dependent Claim
124 words
A distance measuring device for a camera of the kind measuring distances to a plurality of spots located within a photo-taking image plane, comprising: (a) signal projecting means for projecting a distance measuring signal onto spots located within a photo-taking image plane one after another from one side to the opposite side of said image plane; (b) signal receiving means arranged to receive a reflection signal resulting from said distance measuring signal and to produce measured distance data one after another according to the part thereof at which the reflection signal is received; and (c) measured distance data selecting means for voiding measured distance data fluctuating to a great degree in the measured distance data produced by said signal receiving means one after another.
Claim 8
Dependent Claim
31 words
A device according to claim 5, wherein said measured distance data selecting means includes sampling means for sampling the quantity of said measured distance signal received by said signal receiving means.
Claim 9
Dependent Claim
60 words
A device according to claim 6, wherein said measured distance data selecting means includes discriminating means which is arranged to compare the quantity of the measured distance signal sampled by said sampling means with that of the ensuing signal received by said receiving means after sampling, said comparison being performed on said measured distance signals one after another in rotation.
Claim 10
Dependent Claim
13 words
A device according to claim 7, wherein said sampling means includes delay means.
Claim 11
Dependent Claim
88 words
A distance measuring device for a camera, comprising: (a) signal projecting means for projecting a plurality of distance measuring signals onto an object to be photographed; (b) signal receiving means for receiving a signal reflected by the object onto which said plurality of distance measuring signals are projected, said signal receiving means detecting a distance to the object on the basis of said reflected signal; and (c) measured distance data selecting means for voiding said reflected signal which is fluctuating to a degree more than a predetermined value.
Claim 12
Dependent Claim
88 words
A distance measuring device for a camera, comprising: (a) signal projecting means for projecting a plurality of distance measuring signals onto an object to be photographed; (b) signal receiving means for receiving a signal reflected by the object onto which said plurality of distance measuring signals are projected, said signal receiving means detecting a distance to the object on the basis of said reflected signal; and (c) measured distance data selecting means for voiding said reflected signal which is fluctuating to a degree more than a predetermined value.
Claim 13
Dependent Claim
31 words
A device according to claim 9, wherein said measured distance data selecting means includes sampling means for sampling the quantity of said measured distance signal received by said signal receiving means.
Claim 14
Dependent Claim
60 words
A device according to claim 10, wherein said measured distance data selecting means includes discriminating means which is arranged to compare the quantity of the measured distance signal sampled by said sampling means with that of the ensuing signal received by said receiving means after sampling, said comparison being performed on said measured distance signals one after another in rotation.
Claim 15
Dependent Claim
13 words
A device according to claim 11, wherein said sampling means includes delay means.
References Cited (Backward Citations)
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