Patent US5260882A successfully refreshed from Google Patents.
US4534639A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Camera having an exposure mode change-over device
Assignee: Canon Inc
•
Filing: 1983-12-15
•
Granted: 1985-08-13
•
Expires: 2003-12-15
Abstract
Abstract A camera has a light measuring mode setting circuit set according to an exposure mode change-over operation a change-over circuit for a light measuring range is switched over according to the setting of the light measuring mode setting circuit. Thus a light measuring mode of the camera suited for the set exposure mode can be selected according to the setting of the exposure mode.
Inventors
- 👤 Yuichiro Konishi
- 👤 Tokuichi Tsunekawa
- 👤 Hiromi Someya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:12
CPC Classifications
G; G03; G03B; G03B7/00; G03B7/08; G03B7/081
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
137 words
A single lens reflex camera having an exposure mode change-over device which can select one exposure mode out of a variety of exposure modes, comprising: a photo-taking lens; a focus plate on which object light beam from the photo-taking lens is imaged, said focus plate being formed by an electrical optical element divided into a plurality of sections; a light receiving element to measure the object light beam from a transmitting part of said focus plate; a plurality of switches corresponding to said various exposure modes; and a circuit to control density of each section of said electrical optical element depending on the switching action of the plurality of switches, said circuit controlling the density of each section of said electrical optical element so as to select a light measuring mode corresponding to a set exposure mode.
Claim 2
Dependent Claim
137 words
A single lens reflex camera having an exposure mode change-over device which can select one exposure mode out of a variety of exposure modes, comprising: a photo-taking lens; a focus plate on which object light beam from the photo-taking lens is imaged, said focus plate being formed by an electrical optical element divided into a plurality of sections; a light receiving element to measure the object light beam from a transmitting part of said focus plate; a plurality of switches corresponding to said various exposure modes; and a circuit to control density of each section of said electrical optical element depending on the switching action of the plurality of switches, said circuit controlling the density of each section of said electrical optical element so as to select a light measuring mode corresponding to a set exposure mode.
Claim 3
Dependent Claim
20 words
A camera according to claim 1, wherein said electrical optical element is a liquid crystal divided into plurality of patterns.
Claim 4
Dependent Claim
18 words
A camera according to claim 1, wherein the variety of exposure modes are a plurality of program modes.
Claim 5
Dependent Claim
147 words
A single lens reflex camera having an exposure change-over device which can select one exposure mode out of a variety of exposure modes, comprising: a photo-taking lens; a focus plate on which object light beam from the photo-taking lens is imaged, said focus plate being formed with an electrical optical element divided into a plurality of sections; a light receiving element to measure object light beam from a transmitting part of said focus plate said light receiving element being formed into a plurality of sections having shapes similar to the plurality of sections of said electrical optical element; a plurality of switches corresponding to the variety of exposure modes; and a circuit for controlling the density of individual sections of said electrical optical element and selecting individual sections of said light receiving element so as to select a light measuring mode corresponding to a preset exposure mode.
Claim 6
Dependent Claim
147 words
A single lens reflex camera having an exposure change-over device which can select one exposure mode out of a variety of exposure modes, comprising: a photo-taking lens; a focus plate on which object light beam from the photo-taking lens is imaged, said focus plate being formed with an electrical optical element divided into a plurality of sections; a light receiving element to measure object light beam from a transmitting part of said focus plate said light receiving element being formed into a plurality of sections having shapes similar to the plurality of sections of said electrical optical element; a plurality of switches corresponding to the variety of exposure modes; and a circuit for controlling the density of individual sections of said electrical optical element and selecting individual sections of said light receiving element so as to select a light measuring mode corresponding to a preset exposure mode.
Claim 7
Dependent Claim
134 words
A single lens reflex camera having an exposure mode change-over device which can select one exposure mode out of a variety of exposure modes, comprising: a photo-taking lens; a focus plate arranged to have object light beams from the photo-taking lens imaged thereon, said focus plate having an electrical optical element divided into a plurality of sections; a light receiving element to measure object light beam passing through said focus plate; a signal generating circuit for selecting one exposure mode out of various exposure modes and generating a signal according to the selected exposure mode; a control circuit for controlling the density of each section of said electrical optical element according to the signal generated from said signal generating circuit so as to select a light measuring mode corresponding to a set exposure mode.
Claim 8
Dependent Claim
134 words
A single lens reflex camera having an exposure mode change-over device which can select one exposure mode out of a variety of exposure modes, comprising: a photo-taking lens; a focus plate arranged to have object light beams from the photo-taking lens imaged thereon, said focus plate having an electrical optical element divided into a plurality of sections; a light receiving element to measure object light beam passing through said focus plate; a signal generating circuit for selecting one exposure mode out of various exposure modes and generating a signal according to the selected exposure mode; a control circuit for controlling the density of each section of said electrical optical element according to the signal generated from said signal generating circuit so as to select a light measuring mode corresponding to a set exposure mode.
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) | 1988-08-12 | 1989-02-11 | 1989-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-12 | 1993-02-11 | 1993-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-12 | 1997-02-11 | 1997-08-13 | $7700.00 | Window Closed / Lapsed |