Method for the control of stroboscopic light used in electronic still cameras

Claim 2

A stroboscopic control method used in an electronic still camera for recording a frame picture image one frame of which has a first field and a second field, said first field and said second field being changed alternatively every determined time period comprising the steps of: setting a full quantity of stroboscopic light emission as a function of a time from a beginning of a stroboscopic light emission; calculating a time when said stroboscopic light emission is half of said set full quantity of stroboscopic light emission; generating a first read pulse for starting a transmission of electric charges of said first field from a photodiode to a vertical register in a charge coupled device; generating a second read pulse for starting a transmission of electric charges of said second field from said photodiode to said vertical register in said charge coupled device; generating a stroboscopic trigger pulse for starting said stroboscopic light emission; and synchronizing said stroboscopic trigger pulse, said first read pulse and said second read pulse in such a manner that one of said first read pulse and said second read pulse is equivalent to said calculated time.

Claim 3

A stroboscopic control method according to claim 1, wherein: said determined time period is 1/60 second.

Claim 4

A stroboscopic control method according to claim 2, further comprising the steps of: transmitting said electric charges to a horizontal register, converting said transmitted electric charges to digital signals and writing said digital signals in a frame memory.

Claim 5

A stroboscopic control method according to claim 3, further comprising the steps of: processing said written digital signals and reading said processed digital signals out of said frame memory.

Claim 6

A stroboscopic control method according to claim 1, further comprising the step of: correcting said fully quantity of stroboscopic light emission as a function of time.

Claim 7

A stroboscopic control method used in an electronic still camera for recording a frame picture image one frame of which has a first field and a second field, said first field and said second field being changed alternatively every determined time period, comprising the steps of: setting a full quantity of stroboscopic light emission as a function of a time from a beginning of a stroboscopic light emission; calculating a time when said stroboscopic light emission is half of said set full quantity of stroboscopic light emission; generating a first read pulse for starting a transmission of electric charges of said first field from a photodiode to a vertical register in a charge coupled device; generating a second read pulse for starting a transmission of electric charges of said second field from said photodiode to said vertical register in said charge coupled device; generating a first stroboscopic trigger pulse for starting said stroboscopic light emission; generating an interrupting pulse for interrupting said stroboscopic light emission at said calculated time; generating a second stroboscopic trigger pulse for restarting said interrupted stroboscopic light emission; and synchronizing said first read pulse, said second read pulse, said first stroboscopic trigger pulse and said second stroboscopic trigger pulse in such a manner that said stroboscopic light emission started by said first stroboscopic trigger pulse exposes one of said first field and second field, and that said stroboscopic light emission started by said second stroboscopic trigger pulse exposes the other of said first field and second field.

Claim 8

A stroboscopic control method used in an electronic still camera for recording a frame picture image one frame of which has a first field and a second field, said first field and said second field being changed alternatively every determined time period, comprising the steps of: setting a full quantity of stroboscopic light emission as a function of a time from a beginning of a stroboscopic light emission; calculating a time when said stroboscopic light emission is half of said set full quantity of stroboscopic light emission; generating a first read pulse for starting a transmission of electric charges of said first field from a photodiode to a vertical register in a charge coupled device; generating a second read pulse for starting a transmission of electric charges of said second field from said photodiode to said vertical register in said charge coupled device; generating a first stroboscopic trigger pulse for starting said stroboscopic light emission; generating an interrupting pulse for interrupting said stroboscopic light emission at said calculated time; generating a second stroboscopic trigger pulse for restarting said interrupted stroboscopic light emission; and synchronizing said first read pulse, said second read pulse, said first stroboscopic trigger pulse and said second stroboscopic trigger pulse in such a manner that said stroboscopic light emission started by said first stroboscopic trigger pulse exposes one of said first field and second field, and that said stroboscopic light emission started by said second stroboscopic trigger pulse exposes the other of said first field and second field.

Claim 9

A stroboscopic control method according to claim 6, wherein: said determined time period is 1/60 second.

Claim 10

A stroboscopic control method according to claim 6, further comprising the steps of: transmitting said electric charges to a horizontal register; converting said transmitted electric charges to digital signals; and writing said digital signals in a frame memory.

Claim 11

A stroboscopic control method according to claim 8, further comprising the steps of: processing said written digital signals; and reading said processed digital signals out of said frame memory.

Claim 12

A stroboscopic control method according to claim 6, further comprising the step of: correcting said full quantity of stroboscopic light emission as a function of a time.

Claim 13

A stroboscopic control method used in an electronic still camera for recording a frame picture image one frame of which has a first field and a second field, said first field and said second field being changed alternatively every determined time period, comprising the steps of: generating a first read pulse for starting a transmission of electric charges of said first field from a photodiode to a vertical register in a charge coupled device; generating a second read pulse for starting a transmission of electric charges of said second field from said photodiode to said vertical register in said charge coupled device; generating a first stroboscopic trigger pulse for starting a stroboscopic light emission by an automatic stroboscope thereby to expose one of said first field and said second field; generating a second stroboscopic trigger pulse for restarting said stroboscopic light emission thereby to expose the other of said first field and said second field; and synchronizing said first read pulse, said second read pulse, said first stroboscopic trigger pulse and said second stroboscopic trigger pulse in such a manner that quantity of said stroboscopic light emission started by said first stroboscopic trigger pulse equals to quantity of stroboscopic light emission started by said second stroboscopic trigger pulse.

Claim 14

A stroboscopic control method used in an electronic still camera for recording a frame picture image one frame of which has a first field and a second field, said first field and said second field being changed alternatively every determined time period, comprising the steps of: generating a first read pulse for starting a transmission of electric charges of said first field from a photodiode to a vertical register in a charge coupled device; generating a second read pulse for starting a transmission of electric charges of said second field from said photodiode to said vertical register in said charge coupled device; generating a first stroboscopic trigger pulse for starting a stroboscopic light emission by an automatic stroboscope thereby to expose one of said first field and said second field; generating a second stroboscopic trigger pulse for restarting said stroboscopic light emission thereby to expose the other of said first field and said second field; and synchronizing said first read pulse, said second read pulse, said first stroboscopic trigger pulse and said second stroboscopic trigger pulse in such a manner that quantity of said stroboscopic light emission started by said first stroboscopic trigger pulse equals to quantity of stroboscopic light emission started by said second stroboscopic trigger pulse.

Claim 15

A stroboscopic control method according to claim 11, wherein: said determined time period is 1/60 second.

Claim 16

A stroboscopic control method according to claim 11, further comprising the steps of: transmitting said electric charges to a horizontal register; converting said transmitted electric charges to digital signals; and writing said digital signals in a frame memory.

Claim 17

A stroboscopic control method according to claim 13, further comprising the steps of: processing said written digital signals; and reading said processed digital signals out of said frame memory.

Claim 18

A stroboscopic control method according to claim 11, wherein: said quantity of said stroboscope light emission by automatic stroboscope is less than a full quantity of stroboscopic light emission.

Claim 19

A stroboscopic control method according to claim 11, further comprises the step of: generating a shutter control pulse for limiting an exposure period of each of said first field and said second field.

Claim 20

A stroboscopic control method used in an electric still camera for recording a frame picture image one frame of which has a first field and second field, said first field and said second field being changed alternatively every determined period comprising the steps of: generating a first read pulse for starting a transmission of electric charges of said first field from a photodiode to a vertical register in a charged coupled device; generating a second read pulse for starting a transmission of electric charges of said second field from said photodiode to said vertical register in said charge coupled device; generating a first stroboscopic trigger pulse for starting a first stroboscopic light emission by an autostroboscope thereby to expose said first field; generating a second stroboscopic trigger pulse for starting a second stroboscopic light emission by said autostroboscope thereby to expose said second field; and synchronizing said first read pulse, said second read pulse, said first stroboscopic trigger pulse and said second stroboscopic trigger pulse in such a manner that an exposure amount of said first field by said first stroboscopic light emission equals to an exposure amount of said second field by said second stroboscopic light emission.

Claim 21

A stroboscopic control method used in an electric still camera for recording a frame picture image one frame of which has a first field and second field, said first field and said second field being changed alternatively every determined period comprising the steps of: generating a first read pulse for starting a transmission of electric charges of said first field from a photodiode to a vertical register in a charged coupled device; generating a second read pulse for starting a transmission of electric charges of said second field from said photodiode to said vertical register in said charge coupled device; generating a first stroboscopic trigger pulse for starting a first stroboscopic light emission by an autostroboscope thereby to expose said first field; generating a second stroboscopic trigger pulse for starting a second stroboscopic light emission by said autostroboscope thereby to expose said second field; and synchronizing said first read pulse, said second read pulse, said first stroboscopic trigger pulse and said second stroboscopic trigger pulse in such a manner that an exposure amount of said first field by said first stroboscopic light emission equals to an exposure amount of said second field by said second stroboscopic light emission.

Claim 22

A stroboscopic control method according to claim 17, wherein: said determined time period is 1/60 second.

Claim 23

A stroboscopic control method according to claim 17, further comprising the steps of: transmitting said electric charges to a horizontal register; converting said transmitted electric charges to digital signals; and writing said digital signals in a frame memory.

Claim 24

A stroboscopic control method according to claim 19, further comprising the steps of: processing said written digital signals; and reading said processed digital signals out of said frame memory.

Claim 25

A stroboscopic control method according to claim 17, further comprises the step of: generating a shutter control pulse for limiting an exposure period of each of said first field and said second field.