Motion detecting device in exposure control system for optical instrument

A device for detecting the relative motion rate between an object and the device, comprising:

• (A) image forming means for forming an image of an object;
• (B) a first detecting system for detecting the movement rate of the center of gravity of the light quantity distribution of the object image along a predetermined first direction and for providing an output signal indicating the movement rate of the position of said center of gravity along the first direction, said first detecting system including:
• (B-1) means arranged to receive the object image along the first direction, said image receiving means providing an electrical output corresponding to the received radiation;
• (B-2) means for receiving the electrical output of the image receiving means and providing an output signal which varies with the change in the center of gravity of the light quantity distribution of the object image along the first direction;
• (B-3) means for normalizing the output signal of the output receiving means with the object brightness information to provide an output signal indicative of the position of said center of gravity along the first direction;
• and
• (B-4) means for detecting the change rate of the output signal of the normalization means to provide said output signal indicating the movement rate of said center of gravity along the first direction;
• (C) a second detecting system for detecting the movement rate of the center of gravity of the light quantity distribution of the object image along a predetermined second direction substantially perpendicular to the first direction and for providing an output signal representing the movement rate of the position of said center of gravity along the second direction, said second detecting system including:
• (C-1) means arranged to receive the object image along the second direction, said image receiving means providing an electrical output corresponding to the received radiation;
• (C-2) means for receiving the electrical output of the image receiving means and providing an output signal which varies with the change in the center of gravity of the light quantity distribution of the object image along the second direction;
• (C-3) means for normalizing the output signal of the output receiving means with object brightness information to provide an output signal indicative of the position of said center of gravity along the second direction;
• and
• (C-4) means for detecting the change rate of the output signal of the normalization means to provide said output signal indicating the movement rate of said center of gravity along the second direction;
• and
• (D) output means for providing an output signal representing the relative motion rate between the object and the device, combining the output signals of the first and the second detecting systems with each other.

A device for detecting the relative motion between an object and the device, comprising:

• (A) image forming means for forming an image of an object;
• (B) photoelectric means for producing electrical signals in response to radiation received, said photoelectric means being arranged to receive the object image formed by the image forming means;
• and
• (C) a signal processing circuit system for receiving the electrical signals produced from the photoelectric means and providing an electrical output indicative of at least whether or not relative motion has arisen between the object and the device, said circuit system including:
• (C-1) first circuit means for receiving the electrical signals produced from the photoelectric means and providing an output signal which varies with the change in the center of gravity of light quantity distribution of the object image formed on the photoelectric means;
• (C-2) second circuit means for normalizing the output signal of the first circuit means with object brightness information to provide an output signal indicative of the position of the center of gravity of the light quantity distribution of the object image formed on the photoelectric means;
• (C-3) third circuit means for detecting variation of the output signal of the second circuit means and for providing an electric output indicative of at least whether or not relative motion has arisen between the object and the device.

A device for detecting the relative motion between an object and the device along any direction, comprising:

• (A) image forming means for forming an image of an object;
• (B) image sensing means having an array of a plurality of photo-sensors, said image sensing means being arranged to receive the object image formed by the image forming means and each of said photo-sensors producing an electrical signal corresponding to the radiation received;
• and
• (C) a signal processing circuit system receiving the electrical signals produced from the photoelectric means and providing an electrical output indicative of at least whether or not the relative motion has arisen between the object and the device along any direction, said circuit system comprising:
• (C-1) first circuit means for receiving the electrical signals produced from the image means and providing an output signal which varies with the change in the center of gravity of light quantity distribution of the object image formed on the image sensing means;
• (C-2) second circuit means for normalizing the output signal of the first circuit means with object brightness information to provide an output signal indicative of the position of the center of gravity of the light quantity distribution of the object image formed on the image sensing means;
• and
• (C-3) third circuit means for detecting variation of the output signal of the second circuit means, said third circuit means providing said electrical output indicative of at least whether or not the relative motion has arisen between the object and the device along any direction.

An exposure control system for an optical instrument, comprising:

• (A) means for regulating the exposure time of the instrument;
• (B) means for receiving an object image;
• (C) means coupled to said image receiving means to detect the movement rate of the center of gravity of light quantity distribution of the object image on the image receiving means, said movement rate detecting means including:
• (C-1) first circuit means coupled to said image receiving means for providing an output signal which varies with the change in light quantity distribution of the object image on the image receiving means;
• (C-2) second circuit means for normalizing the output signal of said first circuit means with object brightness information to provide an output signal indicative of the position of the center of gravity of the light quantity distribution of the object image on the image receiving means;
• and
• (C-3) third circuit means for detecting the variation rate of the output signal of said second circuit means to detect the movement rate of the center of gravity of the light quantity distribution of the object image formed on the image receiving means;
• and
• (D) means for controlling said exposure time regulating means according to the movement rate of said center of gravity detected by said movement rate detecting means.