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US 5,398,065 AGranted
Image sensing device
AssigneeCanon Kabushiki Kaisha
InventorTadashi Okino
Life of this patent
Estimating the term…
Abstract
In an image sensing device having an image sensor which converts the image of an object to be photographed into an electrical signal and an automatic gain control circuit which automatically controls the gain of the electrical signal, the operation of the automatic gain control circuit is limited according to the mode selected from various special photographic modes.
Claims31
An image sensing device comprising:
- image sensing means which converts the image of an object to be photographed into an electrical signal;
- means for selecting one of a plurality of photographing modes;
- an automatic gain control circuit which automatically controls the gain of said electrical signal;
- and
- limiting means for limiting an operation of said automatic gain control circuit according to a photographing mode selected by the selecting means, said limiting means limiting the gain of said automatic gain control circuit to a predetermined value in a flash photographing mode.
2 more elements
An image sensing device comprising:
- image sensing means which converts the image of an object to be photographed into an electrical signal;
- an automatic gain control circuit which automatically controls the gain of said electrical signal;
- and
- setting means for setting the gain of said automatic gain control circuit at a predetermined value in the case of a flash photography mode.
1 more element
An image sensing device comprising:
- image sensing means which converts the image of an object to be photographed into an electrical signal;
- an automatic gain control circuit which automatically controls the gain of said electrical signal;
- storage instructing means for instructing storing a signal for controlling the gain of said gain control circuit, said controlling signal relating to information on an exposure;
- and
- storage means which stores said controlling signal to control the gain of said gain control circuit in response to instruction of said storage instruction means, said storage means being composed of a sample-and-hold circuit, and said sample-and-hold circuit samples said controlling signal in response to the instruction of said storage instructing means, and said sample-and-hold circuit holds value of the sampled controlling signal.
2 more elements
An image sensing device comprising:
- image sensing means which converts the image of an object to be photographed into an electrical signal;
- an automatic gain control circuit which automatically controls the gain of said electrical signal;
- correction instructing means for instructing correction of an exposure:
- and
- holding means for holding said gain at a predetermined value when the exposure is fixed at a predetermined value by said instructing means, wherein said automatic gain control circuit has a negative feed back loop;
- and said holding means holds a signal of said negative feed back loop.
3 more elements
An image sensing device adapted for use in combination with flash device, said flash device having a charging process and generates a signal upon completion of this charging process, said image sensing device comprising:
- image sensing means which converts the image of an object to be photographed into an electrical signal;
- an automatic gain control circuit which automatically controls the gain of said electrical signal;
- and
- setting means for setting the gain of said automatic gain control circuit at a predetermined value in response to said signal representative of completion of the charging process of said flash device.
1 more element
An image signal apparatus comprising:
- a) image sensing means for converting an image into an electrical signal;
- b) means for amplifying said electrical signal converted by said image sensing means, said amplifying means including an automatic gain control circuit;
- c) means for selecting one of a plurality of image sensing modes;
- and
- d) means for controlling an amplifying operation of said amplifying means in response to a selection of said selecting means, said selecting means selecting at least one of a flash using image sensing mode and a normal sensing mode.
2 more elements
An image sensing apparatus comprising:
- a) image sensing means for converting an image into an electrical signal;
- b) means for selecting one of at least flash using mode and flash unusing mode;
- c) means for amplifying said electrical signal converted by said image sensing means, said amplifying means including an automatic gain control circuit;
- and
- d) means for setting the gain of an amplifying operation of said amplifying means at a specific value which is proper for the flash using mode in the case of the flash using mode.
2 more elements
An image sensing apparatus comprising:
- a) image sensing means for converting an image into an electrical signal;
- b) means for amplifying said electrical signal converted by said image sensing means;
- c) storage instructing means for instructing storing a signal for controlling an amplifying operation of said amplifying means;
- and
- d) storage means for storing said controlling signal to control said amplifying means in response to an instruction by said storage instructing means, said storage means including a sample-and-hold circuit for holding said controlling signal in response to said instruction by said storage instruction means.
2 more elements
An image sensing device comprising:
- (a) image sensing means which converts an image to be photographed into an electrical signal;
- (b) flash lighting means for lighting an object;
- (c) measuring means for measuring an amount of light reflected by said object after flashing of said flash lighting means;
- (d) first control means for controlling a period of flashing of said flash lighting means in response to an output of said measuring means;
- and
- (e) gain control means for controlling a gain of the image sensing means in response to the output of said measuring means.
3 more elements
Dependencies are inferred from the claim text.