Photography – With object illumination for exposure – Having preexposure illumination
Reexamination Certificate
1998-10-05
2001-01-23
Perkey, W. B. (Department: 2851)
Photography
With object illumination for exposure
Having preexposure illumination
C396S257000, C396S509000
Reexamination Certificate
active
06178296
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a camera and a camera system for use with a flash device.
2. Description of Related Art
Some of known camera systems provided with flash light emitting means are capable of making test light emission from the flash light emitting means, as disclosed, for example, in Japanese Laid-Open Patent Application No. HEI 7-120812, etc. In such camera systems, when a light emission start switch is pushed by the photographer, the flash light emitting means emits a predetermined quantity of flash light for testing toward an object, so that the photographer can recognize shades and shadows brought about at the object and the background thereof by the flash light. Thus, the photographer can recognize, prior to photo-taking, an influence to be brought about by the illumination with the flash light.
In the case of the camera system disclosed in the above Japanese laid-open patent application No. HEI 7-120812, however, the test flash light emission is made with a lens diaphragm left in its initial full-aperture state. Therefore, in recognizing the object, etc., through a viewfinder after a light flux passing through the lens diaphragm arrives at the viewfinder, the shades and shadows of the object, etc., observable through the viewfinder at the time of the test flash light emission are only ones which are obtained with the lens diaphragm left in its full-aperture state and which differ from shades and shadows to be obtained by exposing a film to the light coming through the photo-taking lens with the lens diaphragm in a stopped-down state. Accordingly, the prior camera system has such a drawback that the photographer cannot recognize, prior to photo-taking, the shades and shadows of the object and the background to be obtained under flash light emission for a photo-taking operation which is to be performed with the lens diaphragm stopped down as desired to deepen the depth of field.
BRIEF SUMMARY OF THE INVENTION
It is an object of the invention to provide a camera system capable of making test flash light emission before photo-taking under the same condition of a diaphragm as in emitting flash light at the time of photo-taking.
In accordance with one aspect of the invention, there is provided a camera for use with a flash device capable of performing a test light emitting action and a lens device having a diaphragm, the camera comprising lens diaphragm control instructing means for giving an instruction for an aperture controlling action of the diaphragm of the lens device, and test light emission control means for causing, in response to a predetermined operation, both the aperture controlling action by the lens diaphragm control instructing means and the test light emitting action of the flash device to be performed, so that, in response to the predetermined operation, the test light emission can be performed in a state of having the aperture of the lens diaphragm stopped down.
In accordance with another aspect of the invention, there is provided a camera system for use with a flash device capable of performing a test light emitting action, the camera system comprising a diaphragm, aperture setting control means for controlling an aperture setting action of the diaphragm, a predetermined operation part, and test light emission control means for causing, in response to an operation of the predetermined operation part, both the aperture setting action by the aperture setting control means and the test light emitting action of the flash device to be performed, so that, in response to the operation of the predetermined operation part, the test light emission can be performed in a state of having the aperture of the lens diaphragm stopped down.
The above and other objects and aspects of the invention will become apparent from the following detailed description of a preferred embodiment thereof taken in connection with the accompanying drawings.
REFERENCES:
patent: 4429971 (1984-02-01), Mizokami
patent: 4460263 (1984-07-01), Gfeller et al.
Canon Kabushiki Kaisha
Perkey W. B.
Robin Blecker & Daley
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