Electric circuits for camera

An electric circuit for a camera comprising:

• a microcomputer including a D/A converter section capable of receiving a reference voltage from an external unit, and an operation control section;
• a plurality of modules operative based on an instruction from said microcomputer and having a temperature dependency;
• reference-voltage supply means for supplying reference voltages having a plurality of temperature characteristics to said D/A converter section in said microcomputer;
• and
• storage means for storing data on correlations between operations and temperature dependencies of said modules,
• whereby said microcomputer allows said reference-voltage supply means to supply a reference voltage having one of said temperature characteristics, in accordance with the data stored in said storage means, and generates a predetermined output signal using said reference voltage.

An electric circuit for a camera comprising:

• a microcomputer including an A/D converter section, a D/A converter section and an operation control section;
• and
• a reference-voltage outputting circuit operative in response to an instruction from said microcomputer to supply a reference voltage to said A/D converter section and said D/A converter section via a single common signal line,
• whereby said microcomputer switches a temperature characteristic of said reference voltage between a case where said A/D converter section is used and a case where said D/A converter section is used.

An electric circuit for a camera comprising:

• a microcomputer including an operation control section, an LCD driver for internally converting an externally supplied reference voltage to drive a liquid crystal panel and an A/D converter section operative in response to said externally supplied reference voltage;
• and
• a reference-voltage outputting circuit for supplying a reference voltage to said LCD driver and said A/D converter section via a single common signal line,
• whereby said microcomputer switches a temperature characteristic of said reference voltage between a case where said A/D converter section is operated and a case where said A/D converter section is not operated.

An electric circuit for a camera comprising:

• a microcomputer including an operation control section, a D/A converter section operative based on an externally supplied reference voltage;
• a remote control detection circuit for detecting a wireless remote control signal;
• and
• a reference-voltage outputting circuit for supplying a reference voltage for said D/A converter section and power for said remote control detection circuit via a single common signal line.

An electric circuit for a camera comprising:

• a microcomputer including an operation control section and a D/A converter section;
• a focusing circuit for generating an output having a temperature dependency;
• and
• a temperature measuring circuit,
• whereby said microcomputer sets an output of said D/A converter section in response to said temperature measuring circuit to thereby compensate for said temperature dependency of said focusing circuit.

An electric circuit for a camera comprising:

• a blur sensor for detecting a blur state of said camera;
• an amplifier for amplifying a signal from said blur sensor;
• a microcomputer including an operation control section and a D/A converter section;
• and
• a reference-voltage outputting circuit for supplying a reference voltage via a common signal line to two or more of a voltage control circuit for controlling a drive voltage of an actuator of said camera based on an output of said D/A converter section, a blur detecting circuit for setting a reference level of said amplifier based on said output of said D/A converter section and a focusing circuit for setting an analog signal level to be used in a predetermined circuit in accordance with said output of said D/A converter section,
• whereby said microcomputer controls two or more of said voltage control circuit, said blur detecting circuit and said focusing circuit in a time-divisional manner.

An electric circuit for a camera comprising:

• a microcomputer including an A/D converter section, a D/A converter section and an operation control section;
• at least one module operative in response to an instruction from said microcomputer and having an environmental parameter dependency;
• monitor means for outputting an analog signal corresponding to said environmental parameter dependency of said at least one module;
• and
• storage means for storing a correlation between an operation of said at least one module and said analog signal,
• whereby said microcomputer sets data to be given to said D/A converter section in accordance with a value obtained by digital conversion of said analog signal by said A/D converter section and data stored in said storage means.