Claims
- 1. A correct exposure annunciator device for a camera comprising:
- correct exposure annunciator means;
- timer means for producing a timing signal after the lapse of a certain predetermined time after a synchronization switch has operated; and
- control means for operating the correct exposure annunciator means in accordance with generation of a correct exposure representing signal and deenergizing the correct exposure annunciator means with the generation of the timing signal from the timer means.
- 2. A correct exposure annunciator device according to claim 1, wherein said timer means includes:
- (a) a time constant circuit having a integrating capacitor;
- (b) a switching element connected across the integrating capacitor to render the integrating capacitor effective in response to running away of a trailing shutter curtain; and
- (c) a comparator connected across the integrating capacitor for producing the timing signal when an output of said integrating capacitor has reached a predetermined value.
- 3. A correct exposure annunciator device according to claim 1, wherein said control means includes a flip-flop circuit having a set terminal which is supplied with a correct exposure representing signal and a reset terminal which is supplied with the timing signal from the timer means.
- 4. A correct exposure annunciator device according to claim 3, further comprising:
- a gate connected to the reset terminal of said flip-flop circuit for resetting the flip-flop circuit in response to running away of a leading shutter curtain.
- 5. A correct exposure annunciator device according to claim 4, wherein said gate includes a NOR gate.
- 6. A correct exposure annunciator device for a camera comprising:
- (a) light measuring means having a light sensitive means and producing a correct exposure representing signal when the amount of the light reflected from the object reaches a certain predetermined value;
- (b) correct exposure annunciator means; and
- (c) timer means for energizing the correct exposure annunciator means in accordance with the correct exposure representing signal and during a certain predetermined time after a synchronization is disabled.
- 7. A correct exposure annunciator device for a camera comprising:
- (a) light measuring means having a light sensitive means and producing a correct exposure representing signal when the amount of the light reflected from the object reaches a certain predetermined value for giving a proper exposure to a film;
- (b) correct annunciator means; and
- (c) timer means for energizing the correct exposure annunciator means in accordance with the correct exposure representing signal and during a certain predetermined time after a synchronization switch has opened.
Priority Claims (1)
Number |
Date |
Country |
Kind |
56-163146 |
Oct 1981 |
JPX |
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Parent Case Info
This is a continuation of application Ser. No. 429,511 filed Sept. 30, 1982.
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Continuations (1)
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Number |
Date |
Country |
Parent |
429511 |
Sep 1982 |
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