Camera with data exposure function
First Claim
1. A camera with a data exposure function for exposing data relating to characters, numerals or symbols by lighting a plurality of light emission devices interlockingly with a film feeding operation, comprising:
- a film feeding motor;
a motor pulse signal output portion for outputting a motor pulse signal according to rotation of said film feeding motor;
a perforation detecting portion for detecting a perforation provided in said film to output a perforation signal;
a counting portion for counting the number of motor pulse signals generated after a perforation is detected by said perforation detecting portion until another perforation is detected;
a determining portion for determining a lighting interval pulse for controlling at least a lighting interval of said light emission devices based on a value counted by said counting portion;
a motor pulse period measuring portion for measuring a period of said motor pulse signal;
a correction time calculating portion for calculating a correction time corresponding to a decimal portion of said lighting interval pulse based on the decimal portion of said lighting interval pulse and a motor pulse period measured by said motor pulse period measuring portion; and
a control portion for controlling a lighting interval of said light emission devices using an integer portion of the lighting interval pulse determined by said determining portion and the correction time calculated by said correction time calculating portion.
1 Assignment
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Accused Products
Abstract
This invention provides a camera with a data exposure function comprising: a dot LED; a film winding mechanism provided with a film feeding motor; a film winding operation detecting portion for outputting a motor pulse signal corresponding to a rotation of the film feeding motor; a perforation detecting portion for detecting a perforation to output a perforation signal; and a main microcomputer for determining a lighting interval pulse by counting the number of motor pulses during detection of plural perforations, calculating a correction time corresponding to a decimal portion of the lighting interval pulse with reference to the period of a motor pulse signal and controlling a lighting interval of the dot LED based on an integer portion of the lighting interval pulse and the correction time.
11 Citations
15 Claims
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1. A camera with a data exposure function for exposing data relating to characters, numerals or symbols by lighting a plurality of light emission devices interlockingly with a film feeding operation, comprising:
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a film feeding motor;
a motor pulse signal output portion for outputting a motor pulse signal according to rotation of said film feeding motor;
a perforation detecting portion for detecting a perforation provided in said film to output a perforation signal;
a counting portion for counting the number of motor pulse signals generated after a perforation is detected by said perforation detecting portion until another perforation is detected;
a determining portion for determining a lighting interval pulse for controlling at least a lighting interval of said light emission devices based on a value counted by said counting portion;
a motor pulse period measuring portion for measuring a period of said motor pulse signal;
a correction time calculating portion for calculating a correction time corresponding to a decimal portion of said lighting interval pulse based on the decimal portion of said lighting interval pulse and a motor pulse period measured by said motor pulse period measuring portion; and
a control portion for controlling a lighting interval of said light emission devices using an integer portion of the lighting interval pulse determined by said determining portion and the correction time calculated by said correction time calculating portion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A camera with a data exposure function comprising:
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a data exposure portion including plural light emission devices disposed in a direction perpendicular to a film feeding direction;
a film feeding portion for winding a film by a frame after exposure by controlling drive of a film feeding motor;
a motor pulse signal outputting portion for outputting a motor pulse signal corresponding to a rotation amount accompanied by the rotation of the film feeding motor;
a perforation detecting portion for detecting a perforation provided in the film to output a perforation signal;
a counting portion for counting the number of the motor pulse signals in a period in which particular two perforations are detected by the perforation detecting portion;
a determining portion for determining a lighting interval pulse for controlling a lighting interval of the light emission devices based on a value counted by the counting portion;
a correction time calculating portion for calculating a correction time corresponding to a decimal portion of the lighting interval pulse determined by the determining portion with reference to a period of the motor pulse signal; and
a control portion for exposing data relating to characters, numerals or symbols to the film by controlling a lighting interval of the light emission devices in the data exposure means, based on an integer portion of the lighting interval pulse determined by the determining portion and a correction time calculated by the correction time calculating portion. - View Dependent Claims (12, 13, 14)
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15. A data exposure method of a camera with a data exposure function for exposing data relating to characters, numerals or symbols by lighting a plurality of light emission devices interlockingly with a film feeding operation, comprising the steps of:
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outputting a motor pulse signal with a rotation of a film feeding motor;
detecting a perforation provided in the film;
counting the number of motor pulse signals in an interval since a predetermined perforation is detected until a subsequent perforation is detected;
measuring the period of the motor pulse signal;
determining a lighting interval pulse for controlling a lighting interval of the light emission devices based on the counted value;
calculating a correction time corresponding to a decimal portion of the lighting interval pulse by calculating the decimal portion of the lighting interval pulse and the period of the motor pulse signal; and
controlling the lighting interval of the light emission devices using an integer portion of the determined lighting interval pulse and the correction time.
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Specification