Digital information indicating system

A device for indicating photographic exposure information in digital form, comprising:

• (a) a conversion means to convert analog exposure information corresponding to an object brightness into a digital value;
• (b) a first register means to read out and memorize the output of said brightness information converting means;
• (c) a second register means coupled to said first register means;
• (d) an indication circuit connected to said second register means to indicate the content of the second register means;
• (e) a transmit signal forming circuit for producing a transmit signal for transmitting the content of the first register means into said second register means at a certain determined period, said certain determined period being a period longer than that necessary for visually recognizing the display value;
• (f) a control circuit which forms a transmit signal for transmitting the content of the first register means to the second register means independently of the transmit signal formed by the transmit signal forming circuit;
• said circuit comprising:
• (1) a constant value memorizing means to memorize a digital value corresponding to a predetermined constant value;
• and
• (2) a determining means coupled to said first register means, said second register means and said constant memorizing means for determining whether or not the difference between the content of the first register means and that of the second register means is within a predetermined value of the constant value memorizing means, wherein said determining means provides said transmit signal when said value of difference exceeds said predetermined value.

A device for indicating digital exposure information, comprising:

• (a) a conversion means to convert analog exposure information corresponding to an object brightness into a digital value;
• (b) a first register means to read out and memorize the output of said brightness information converting means;
• (c) a second register means coupled to said first register means;
• (d) an indication means coupled to said second register means to indicate the content of the second register means;
• (e) a transmit signal forming circuit for producing a transmit signal for transmitting the content of said first register means into said second register means at a certain determined period, said certain determined period being a period longer than that necessary for visually recognizing the display value;
• (f) a constant value memorizing means for providing a digital value corresponding to a predetermined constant value memorized therein;
• (g) a threshold value forming means coupled to said second register means and said constant memorizing means for forming a predetermined upper limit value and a predetermined lower limit value based on the content of said second register means and the content of said constant value memorizing means;
• (h) a comparison circuit coupled to said first register means and said threshold value forming means to compare the content of the first register means with said upper limit value and lower limit value and for generating an output when the value of the content of the first register means is either above the upper limit value or below the lower limit value;
• and
• (i) a transmitting means coupled to said second register means for transmitting the content of the first register means to the second register means in response to the output of the comparison means independent of said transmit signal.

A device for indicating photographic exposure information in digital form, comprising:

• (a) a conversion means to convert analog exposure information corresponding to an object brightness into a digital value;
• (b) a first register means to read out and memorize the output of said brightness information converting means;
• (c) a second register means coupled to said first register means;
• (d) an indication means coupled to said second register means for indicating the content of the second register means;
• (e) a transmit signal forming circuit for producing a transmit signal for transmitting the content of said first register means into said second register means at a certain determined period, said certain determined period being a period longer than that necessary for visually recognizing the display value;
• (f) a constant value memorizing means for providing a digital value corresponding to a predetermined constant value memorized therein;
• (g) an adder means connected to said second register means and said constant memorizing means to add together the content of the second register means and the content of the constant value memorizing means;
• (h) a subtraction means connected to said second register means and said constant value memorizing means to subtract the content of the constant memorizing means from the content of the second register means;
• (i) a first comparison means coupled to said first register means and said adder mens for generating an output when the content of the first register means has a greater value than that of the output of the adder means;
• (j) a second comparison means coupled to said first register means and said subtraction means for generating an output when the content of the first register means has a smaller value than that of the output of the subtraction means;
• and
• (k) a transmission means to transmit the content of said first register to the second register in response to the output of said first and second comparison means independent of said transmit signal from said transmit signal forming circuit.

A device for indicating photographic exposure information in digital form, comprising:

• (a) a light measuring circuit for providing an analog signal corresponding to an object brightness;
• (b) an analog-digital conversion means connected to said light measuring circuit for converting the analog value thereof to a digital value, wherein the value of the output of said conversion means varies corresponding to brightness;
• (c) a register means coupled to said analog-digital conversion means for memorizing the output of the analog-digital conversion means;
• (d) an indication means coupled to said register means to indicate the content thereof;
• (e) a transmit signal forming circuit for producing a transmit signal for transmitting the output of said analog-digital conversion means into said register means at a certain determined period, said certain determined period being a period necessary for visually recognizing the display value;
• and
• (f) a comparison means coupled to said analog-digital conversion means and to said register means, wherein the output terminal of said comparison means is coupled to the register means so that the comparison means compares the output of the analog-digital conversion means and the content of the register means and generates an output for transmitting the output of said analog-digital conversion means to said register means independent of said transmit signal when the value of difference between the output of the analog-digital conversion means and the content of the register means is greater than a predetermined constant value.

A device for indicating photographic exposure information comprising:

• (a) an exposure information forming means to provide an analog signal corresponding to an object brightness;
• (b) an analog-digital conversion means coupled to said exposure information for converting the analog value thereof to a digital value, wherein the value of the output of said conversion means varies corresponding to brightness;
• (c) memory means coupled to said analog-digital conversion means for memorizing the output of the analog-digital conversion means;
• (d) indication means coupled to said memory means to indicate the content thereof;
• (e) a transmit signal forming circuit for producing a transmit signal for transmitting the output of said analog-digital conversion means to said memory means at a certain determined period, said certain determined period being longer than a period necessary for visually recognizing the display value;
• and
• (f) a control circuit for transmitting the output of the analog-digital conversion means to said memory means independent of said transmit signal when the value difference between the output of the analog-digital conversion means and the content of content of the memory means is greater than a predetermined value,
• whereby the content of the memory means is successively and periodically renewed and, when the brightness changes beyond a predetermined value, the content of the memory means is renewed irrespective of the above periodicity.