Camera with built-in electronic flash and electronic flash device

A camera with a built-in electronic flash device, comprising:

• (a) a photographing lens;
• (b) an aperture stop;
• (c) an electronic flash emitting portion;
• (d) a light receiving element for receiving light reflected on a photographic object which has been emitted by the electronic flash emitting portion;
• and
• (e) an electronic flash circuit for making the electronic flash emitting portion emit light, the flash circuit comprising an automatic emission control circuit which stops emission of the electronic flash emitting portion when an amount of the reflected light received by the light receiving element reaches a specified value,
• wherein with respect to the automatic emission control circuit, Amin and Amax satisfy the following conditional expressions,
• (A−1)EV≦Amin≦(A+0.5)EV, and 0.5EV≦Amax−Amin,
• where Amin and Amax are a minimum exposure value and a maximum exposure value respectively for a recording medium on which a specified photographic object is recorded when the photographic object that is located at a distance falling within a range from a specified shortest distance to a distance determined by both a guide number obtained when the electronic flash emitting portion emits light at full emission and the aperture stop, is photographed, and A represents a theoretical exposure value.

An electronic flash device comprising:

• (a) an electronic flash emitting portion;
• and
• (b) an electronic flash circuit having an automatic emission control circuit for making the electronic flash emitting portion emit light,
• wherein the automatic emission control circuit stops emission of the electronic flash emitting portion when an amount of reflected light received by a light receiving element for receiving light reflected on a photographic object which has been emitted by the electronic flash emitting portion, reaches a specified value, and
• wherein with respect to the automatic emission control circuit, Amin satisfies the following conditional expression,
• (A−1)EV≦Amin≦(A+0.5)EV,
• where Amin represents a minimum exposure value for a recording medium on which a specified photographic object is recorded when the photographic object that is located at a distance falling within a range from a specified shortest distance to a distance determined by both a guide number obtained when the electronic flash emitting portion emits light at full emission and the aperture stop, is photographed, and A represents a theoretical exposure value.

An electronic flash device comprising:

• (a) an electronic flash emitting portion;
• and
• (b) an electronic flash circuit having an automatic emission control circuit for making the electronic flash emitting portion emit light,
• wherein the automatic emission control circuit stops emission of the electronic flash emitting portion when an amount of reflected light received by a light receiving element for receiving light reflected on a photographic object which has been emitted by the electronic flash emitting portion, reaches a specified value, and
• wherein with respect to the automatic emission control circuit, Amin and Amax satisfy the following conditional expressions,
• (A−1)EV≦Amin≦(A+0.5)EV, and 0.5EV≦Amax−Amin,
• where Amin and Amax are a minimum exposure value and a maximum exposure value, respectively for a recording medium on which a specified photographic object is recorded when the photographic object that is located at a distance falling within a range from a specified shortest distance to a distance determined by both a guide number when the electronic flash emitting portion emits light at full emission and the aperture stop, is photographed, and A represents a theoretical exposure value.