Patent EP0273319A2 successfully refreshed from Google Patents.
EP0273319A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Electronic still camera
Assignee: Fujifilm Holdings Corp
•
Filing: 1987-12-18
•
Granted: —
•
Expires: 2007-12-18
Abstract
Abstract An electronic still camera which photographs an object by image pickup means such as a solid image pickup element or the like and records the video signal of the object into a rotary recording medium such as a magnetic disc or the like. The electronic still camera includes a mechanical shutter and an electronic shutter function to control electrically the accumulation time of the image pickup means and it is adapted such that, when the shutter speed is slower than a predetermined value, it controls a time for exposure to the image pickup means by the mechanical shutter and, when the shutter speed is higher than the predetermined value, it controls the exposure time to the image pickup means by means of the electronic shutter function and also controls the mechanical shutter to remain open at least for the exposure time.
Inventors
- 👤 Kazukiyo Tamada
- 👤 Kiyotaka Kaneko
- 👤 Motohiko Horio
- 👤 Kazutsugu Ogata
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-26 09:59
CPC Classifications
H; H04; H04N; H04N23/00; H04N23/70; H04N23/73; Y; Y10; Y10S; Y10S358/00; Y10S358/906
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
353 words
An electronic still camera comprising: a photographing optical system including a diaphragm; image pickup means for converting an image of an object focused by said photographing optical system into an electric video signal and for accumulating said electric video signal; recording means for recording said video signal into a rotary magnetic recording medium; a mechanical shutter interposed between said photographing optical system and said image pickup means; photograph mode setting means for setting up various kinds of photographing modes including a sequential photographing mode; and, record control means for controlling said diaphragm, said mechanical shutter, said image pickup means and said recording means in accordance with the brightness of said object received from said photographing optical system, for recording a video signal obtained by means of exposure to said image pickup means in synchronization with the output timing of a reference signal used to determine the control cycles of various controls, and for recording said video signal into said rotary recording medium, wherein said record control means is adapted such that, when the shutter speed that is determined in the exposure control of said image pickup means is slower than a predetermined value, it controls the exposure in such a manner to coincide the time for exposure to said image pickup means with a time during which said mechanical shutter is open, and on the other hand, when the shutter speed determined is higher than said predetermined value or in the case of a high speed sequential photographing, it discharges the remaining electric charges of said image pickup means at a time prior to the read-out time of said video signal by an actual exposure time and controls the opening and closing of said mechanical shutter using as an exposure time a time at least longer than a time obtained by adding an actual exposure time and a time required for opening and closing said mechanical shutter, so that it reads out the video signals accumulated up to that time in said image pickup means at a time after the actual exposure time elapses from the discharge time of said remaining electric charges.
Claim 2
Dependent Claim
353 words
An electronic still camera comprising: a photographing optical system including a diaphragm; image pickup means for converting an image of an object focused by said photographing optical system into an electric video signal and for accumulating said electric video signal; recording means for recording said video signal into a rotary magnetic recording medium; a mechanical shutter interposed between said photographing optical system and said image pickup means; photograph mode setting means for setting up various kinds of photographing modes including a sequential photographing mode; and, record control means for controlling said diaphragm, said mechanical shutter, said image pickup means and said recording means in accordance with the brightness of said object received from said photographing optical system, for recording a video signal obtained by means of exposure to said image pickup means in synchronization with the output timing of a reference signal used to determine the control cycles of various controls, and for recording said video signal into said rotary recording medium, wherein said record control means is adapted such that, when the shutter speed that is determined in the exposure control of said image pickup means is slower than a predetermined value, it controls the exposure in such a manner to coincide the time for exposure to said image pickup means with a time during which said mechanical shutter is open, and on the other hand, when the shutter speed determined is higher than said predetermined value or in the case of a high speed sequential photographing, it discharges the remaining electric charges of said image pickup means at a time prior to the read-out time of said video signal by an actual exposure time and controls the opening and closing of said mechanical shutter using as an exposure time a time at least longer than a time obtained by adding an actual exposure time and a time required for opening and closing said mechanical shutter, so that it reads out the video signals accumulated up to that time in said image pickup means at a time after the actual exposure time elapses from the discharge time of said remaining electric charges.
Claim 3
Dependent Claim
91 words
An electronic still camera as set forth in Claim 1, wherein said record control means, in said high speed sequential photographing, performs the respective operations, that is, discharge of the remaining electric charges in said image pickup means, accumulation of signal electric charges in said image pickup means and read-out of said signal electric charges after said mechanical shutter is released in accordance with the number of frames to be sequentially photographed, and, at time when said series of sequential photograph sequences are completed, it allows said mechanical shutter to close.
Claim 4
Dependent Claim
38 words
An electronic still camera as set forth in Claim 1, wherein said predetermined value is selected as a value in the neighborhood of the shutter speed limit value that can maintain the control precision of said mechanical shutter.
Claim 5
Dependent Claim
17 words
An electronic still camera as set forth in Claim 3, wherein said predetermined value is 1/1000 sec.
Claim 6
Dependent Claim
306 words
An electronic still camera comprising: a photographing optical system including a diaphragm mechanism; image pickup means for converting an image of an object focused by said photographing optical system into an electric video signal and for accumulating said electric video signal; recording means for recording said video signal into a rotary magnetic recording medium; a mechanical shutter interposed between said photographing optical system and said image pickup means; photograph mode setting means for setting up various kinds of photographing modes including a sequential photographing mode; and, record control means for controlling said diaphragm mechanism, said mechanical shutter, said image pickup means and said recording means in accordance with the brightness of said object image received from said photographing optical system, for recording a video signal obtained by means of exposure to said image pickup means in synchronization with the output timing of a reference signal used to determine the control cycles of various controls, and for recording said video signal into said rotary recording medium, wherein said record control means is adapted such that, when the shutter speed that is determined in the exposure control of said image pickup means is slower than a predetermined value, it controls a time for exposure to said image pickup means by opening and closing said mechanical shutter in accordance with said shutter speed, and on the other hand, when the shutter speed determined is higher than said predetermined value, it controls the time of discharge of electric charges remaining in said image pickup means in accordance with said shutter speed, whereby it controls an actual exposure time for exposure to said image pickup means extending from said discharge time to a time at which said video signal accumulated again is read out and also it controls said mechanical shutter to remain open at least for said actual exposure time.
Claim 7
Dependent Claim
306 words
An electronic still camera comprising: a photographing optical system including a diaphragm mechanism; image pickup means for converting an image of an object focused by said photographing optical system into an electric video signal and for accumulating said electric video signal; recording means for recording said video signal into a rotary magnetic recording medium; a mechanical shutter interposed between said photographing optical system and said image pickup means; photograph mode setting means for setting up various kinds of photographing modes including a sequential photographing mode; and, record control means for controlling said diaphragm mechanism, said mechanical shutter, said image pickup means and said recording means in accordance with the brightness of said object image received from said photographing optical system, for recording a video signal obtained by means of exposure to said image pickup means in synchronization with the output timing of a reference signal used to determine the control cycles of various controls, and for recording said video signal into said rotary recording medium, wherein said record control means is adapted such that, when the shutter speed that is determined in the exposure control of said image pickup means is slower than a predetermined value, it controls a time for exposure to said image pickup means by opening and closing said mechanical shutter in accordance with said shutter speed, and on the other hand, when the shutter speed determined is higher than said predetermined value, it controls the time of discharge of electric charges remaining in said image pickup means in accordance with said shutter speed, whereby it controls an actual exposure time for exposure to said image pickup means extending from said discharge time to a time at which said video signal accumulated again is read out and also it controls said mechanical shutter to remain open at least for said actual exposure time.
Claim 8
Dependent Claim
38 words
An electronic still camera as set forth in Claim 5, wherein said predetermined value is selected as a value in the neighborhood of the shutter speed limit value that can maintain the control precision of said mechanical shutter.
Claim 9
Dependent Claim
17 words
An electronic still camera as set forth in Claim 6, wherein said predetermined value is 1/1000 sec.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.