Automatic exposing apparatus

• US 4,933,703 A
• Filed: 10/20/1989
• Issued: 06/12/1990
• Est. Priority Date: 10/25/1988
• Status: Expired due to Term

• Current Assignee: Nikon Corporation
• Original Assignee: Nikon Corporation
• Inventors: Terui, Nobuhiko
• Primary Examiner(s): PERKEY, WILLIAM B
• Application Number:
  US07/424,502
• Time in Patent Office: 235 Days
• Field of Search: 354/412, 354/446, 354/456, 354/173.1, 354/173.11, 354/441, 354/442
• US Class Current: 396/242
• CPC Class Codes: G03B 17/425 motor drive cameras
• CPC Class Codes: G03B 7/093 for control of exposure time

Abstract

There is provided an automatic exposure control apparatus of a camera, comprising: a winding-up device to wind up a film after completion of the photographing; an output device to output an exposure start signal with respect to completion of the winding-up operation of the film; an exposure determining device to determine an exposure control value in response to the exposure start signal; and an exposure control unit to execute the exposure control of the camera on the basis of the exposure control value determined, wherein the exposure control unit previously stores at least one or more first exposure control value before the first photographing and, when the second photographing is executed before a second exposure control value is determined in response to the first exposure start signal which is output with respect to the first winding-up operation after the first winding-up operation was completed, the exposure control unit executes the exposure control by the first exposure control value.

Claims

1. An automatic exposure control apparatus of a camera, comprising:

winding means for winding up a film after completion of the photographing;

output means for outputting an exposure start signal with respect to completion of the winding-up of the film;

exposure determining means for determining an exposure control value in response to the exposure start signal; and

.

exposure control means for controlling an exposure of the camera on the basis of said exposure control value determined,

wherein said exposure control means previously stores at least one or more first exposure control values before the first photographing operation and, when the second photographing is executed before a second exposure control value is determined in response to a first exposure start signal which is output with regard to the first winding-up operation after completion of the first winding-up operation, the exposure control means executes the exposure control by the first exposure control value.

2. An apparatus according to claim 1, wherein said exposure determining means includes a photometric circuit and said photometric circuit executes a photometric process of an object to be photographed in response to the exposure start signal and determines the exposure control value on the basis of said photometric process,

and said exposure control means executes the exposure control by the first exposure control value when the second photographing is executed before the second exposure control value is determined after the photometric process of the object to be photographed was started in response to the first exposure start signal which is output with respect to the completion of the first winding-up operation after the first winding-up operation had been completed.

3. An apparatus according to claim 1, wherein said exposure control means executes the exposure control by the second exposure control value when the second photographing is executed after the second exposure control value was determined.

4. An apparatus according to claim 1, wherein said exposure control means determines a shutter speed on the basis of the exposure control value.

5. An apparatus according to claim 1, wherein said exposure control means determines an opening degree of a diaphragm on the basis of the exposure control value.

6. An apparatus according to claim 1, wherein said output means outputs the exposure start signal after the mechanical vibration of a reflecting member provided in the camera which is caused in association with the photographing was attenuated.