Emission controller for electronic flash associated with an electronic camera

• US 4,593,312 A
• Filed: 08/31/1983
• Issued: 06/03/1986
• Est. Priority Date: 10/27/1982
• Status: Expired due to Term

• Current Assignee: Olympus Optical Company Ltd. (Olympus Corporation)
• Original Assignee: Olympus Optical Company Ltd. (Olympus Corporation)
• Inventors: Yamasaki, Masafumi
• Primary Examiner(s): Rubinson, Gene Z.
• Assistant Examiner(s): BRINICH, STEPHEN M
• Application Number:
  US06/528,163
• Time in Patent Office: 1,007 Days
• Field of Search: 358/211, 358/213, 358/217, 358/225, 358/212, 358/209, 358/310, 358/909, 354/129, 354/139, 354/149.1, 354/149.11, 354/147, 354/413, 354/416, 354/422, 354/444
• US Class Current: 348/371
• CPC Class Codes: G03B 15/05 Combinations of cameras with electronic flash apparatus; Electronic flash units
• CPC Class Codes: G03B 2215/05 Combinations of cameras with electronic flash units
• CPC Class Codes: H04N 23/74 by influencing the scene brightness using illuminating means
• CPC Class Codes: H04N 25/00 Circuitry of solid-state image sensors [SSIS]; Control thereof

Abstract

An emission controller for an electronic flash associated with an electronic camera including a solid state pickup element is provided. In response to the closure of a flash photography mode switch which conditions an electronic flash for emission of flashlight, all photodiodes of the solid state pickup element which define the picture elements are uniformly initialized. Subsequently, in response to the closure of an emission initiate switch which initiates the emission of flashlight from an electronic flash, the photodiodes are reset or freed from the initialized condition, and the solid state pickup element begins to be scanned to thereby read out the picture elements at a given time delay after the emission of flashlight from the electronic flash.

Claims

1. An emission controller for an electronic flash associated with an electronic camera which includes both a solid pickup element having individual photoelectric transducer elements which define picture elements of the solid state pickup element, and means for normally repeatedly scanning the transducer element in a predetermined timing sequence;

said emission controller comprising;

(a) means for disabling the scanning means and initializing the individual photoelectric transducer elements by placing each of said transducer elements at a common charge level, prior to the emission of flash light from said electronic flash;

(b) means for resetting the transducer elements in substantially simultaneous synchronized relationship with the emission of flash light from the electronic flash so as to permit the charge level of each individual transducer element to change as function of the amount of light from the electronic flash impinging on that transducer element; and

(c) means for enabling the scanning means so as to initiate a sequential scanning of the transducer element at a given time delay after the emission of flash light from the electronic flash.

2. An emission controller according to claim 1 in which the initializing means includes a flash photography mode switch, the solid state pickup element being associated with a scan circuit having control switching elements connected on its output side for scanning the transducer elements of the pickup element, all of the control switching elements being turned on in synchronism with the operation of the mode switch.

3. An emission controller according to claim 2 in which the mode switch operates to charge a capacitor in synchronism therewith, which capacitor is used to trigger the emission of flashlight from an electronic flash.

4. An emission controller according to claim 2 in which the reset means includes an emission initiate switch, the solid state pickup element being associated with a scan circuit having control switching elements connected to its output side for scanning the transducer elements of the pickup element, all of the control switching elements being turned on in synchronism with the operation of the mode switch and being turned off in synchronism with the operation of the emission initiate switch.

5. An emission controller according to claim 4 in which the emission initiate switch is mechanically interlocked with a shutter release button of a camera, the operation of the mode switch causing a capacitor to be charged which is used to trigger the emission of flashlight from the electronic flash, the operation of the emission initiate switch causing the capacitor to discharge, thereby initiating the emission of flashlight from the electronic flash.

6. An emission controller according to claim 1 in which the means for initiating a sequential scanning includes a delay circuit for delaying by a given time interval a signal produced by an emission initiate switch which is contained within the reset means for initiating the emission of flashlight from an electronic flash, and a drive pulse generator reset by a flash photography mode switch contained within the initializing means and enabled by an output from the delay circuit for driving a scan circuit associated with the solid state pickup element.

12. An emission controller as in claim 1, wherein said disabling of the scanning means and initialization of the transducer elements are substantially simultaneous.

13. An emission controller as in claim 1, wherein said given time delay for enabling of the scanning means after the emission of flash light is selected to enable the scanning after said flash light emission has been substantially completed.

14. An emission controller as in claim 1, wherein said means for disabling the scanning means includes flash photography mode selection means which disables said scanning means and substantially simultaneously prepares such electronic flash for flash light emission.

15. An emission controller as in claim 1, wherein said means for disabling said scanning means includes a flash photography mode selection switch, and said means disables said scanning means in substantially simultaneous synchronization with the operation of said mode selection switch.

16. An emission controller as in claim 1, wherein said mode selection switch substantially simultaneously disables said scanning means and prepares such electronic flash for flash light emission.

7. An emission controller for an electronic flash associated with an electronic camera which includes a solid state pickup element;

said emission controller comprising;

means for initializing individual photoelectric transducer elements which define picture elements of the solid state state pickup element, prior to the emission of flash light from an electronic flash;

said initializing means including a flash photography mode switch;

said solid state pick up element being associated with a scan circuit having control switching elements connected on its output side for scanning said transducer elements of said pickup element, all of said control switching elements being turned on in synchronism with the operation of said mode switch;

means for resetting said transducer elements in synchronized relationship with the emission of flash light from said electronic flash; and

means for initiating a sequential scanning of said transducer elements at a given time delay after the initiation of emission of flashlight from said electronic flash.

8. An emission controller according to claim 7 in which the mode switch operates to charge a capacitor in synchronism therewith, which capacitor is used to trigger the emission of flashlight from an electronic flash.

9. An emission controller according to claim 7 in which the reset means includes an emission initiate switch, the solid state pickup element being associated with a scan circuit having control switching elements connected to its output side for scanning the transducer elements of the pickup element, all of the control switching elements being turned on in synchronism with the operation of the mode switch and being turned off in synchronism with the operation of the emission initiate switch.

10. An emission controller according to claim 7 in which the emission initiate switch is mechanically interlocked with a shutter release button of a camera, the operation of the mode switch causing a capacitor to be charged which is used to trigger the emission of flashlight from the electronic flash, the operation of the emission initiate switch causing the capacitor to discharge, thereby initiating the emission of flashlight from the electronic flash.

11. An emission controller for an electronic flash associated with an electronic camera which includes a solid state pickup element, said emission controller comprising:

means for initializing individual photoelectric transducer elements which define picture elements of the solid state pickup element, prior to the emission of flashlight from an electronic flash;

means for resetting the transducer elements in synchronized relationship with the emission of flashlight from said electronic flash;

means for initiating a sequential scanning of said transducer elements at a given time delay after initiation of emission of flashlight from said electronic flash, said means for initiating a sequential scanning including a delay circuit for delaying by a given time interval a signal produced by an emission initiate switch which is contained within said resetting means for initiating the emission of flashlight from an electronic flash, and a drive pulse generator reset by a flash photography mode switch contained within the initializing means and enabled by an output from said delay circuit for driving a scan circuit associated with said solid state pickup element.