Exposure control apparatus used for a camera
AssigneeFuji Photo Film Co., Ltd.
InventorKazuo Kamata
Life of this patent
Estimating the term…
Abstract
A flash lever for actuating a flash switch is interlocked with a stop plate via a spring. When a picture is taken without a flash, photographing is performed in a state that a small stop opening of the stop plate is disposed at an optical path. When the flash lever is moved to an ON position in order to take a picture with the flash, the flash switch is turned on to activate a flash circuit and a photometry circuit. At this time, the stop plate is evacuated from the optical path so that photographing is performed only through a fixed stop opening. If luminance of a subject is large in this condition, an electric current is supplied to an electromagnet to pull an iron plunger therein for returning the stop plate to the original position. In virtue of this, photographing is performed through the small stop opening.
Claims21
An exposure control apparatus used for a camera having a taking lens and a flash device, said exposure control apparatus comprising:
- measurement means for measuring luminance of ambient light;
- judgment means for judging whether or not said luminance of the ambient light is higher than a prescribed level;
- and
- light-amount regulating means for reducing exposure light passing through said taking lens when said measured luminance of the ambient light is higher than said prescribed level,
- wherein said exposure control apparatus is actuatable when said flash device is actuatable,
- wherein said flash device is turned on when photographing is performed with a flash, said flash device having a flash switch for receiving electricity from a battery, and a flash operation member for turning on and off said flash switch, said exposure control apparatus being supplied with electricity by said battery in association with an on-operation of said flash operation member, in order to make said exposure control apparatus actuatable.
An exposure control apparatus used for a camera having a taking lens and a flash device, said exposure control apparatus comprising:
- an ambient luminance measuring device;
- a flash power switch having an ON and an OFF position;
- and
- a light regulating element constructed to selectively pass either a first or second amount of light to a photographic film, wherein the first amount is greater than the second amount;
- wherein the ambient luminance measuring device and the flash power switch are connected to control the light regulating element so that:
- if the flash power switch is in the OFF position, the light regulation element is set to pass the second amount of light;
- if the flash power switch is in the ON position and the ambient luminance measuring device measures lower than a predetermined threshold level of luminance, the light regulating element is set to pass the first amount of light;
- and
- if the flash power switch is in the ON position and the ambient luminance measuring device measures greater than the predetermined threshold level of luminance, the light regulation element is set to pass the second amount of light.
Dependencies are inferred from the claim text.