Optical apparatus

An optical apparatus comprising:

• a) an optical system including at least a focusing lens;
• b) driving means for driving said focusing lens;
• c) computing means for obtaining sensitivity information concerned with an amount of movement of the position of an image forming plane relative to a predetermined driving degree of said focusing lens;
• d) focus detecting means;
• e) control means for causing said driving means to drive said focusing lens at a first speed and, after that, at a second speed which is lower than said first speed and, then, stop said focusing lens, on the basis of focus information obtained by said focus lens, on the basis of focus information obtained by said focus detecting means and said sensitivity information obtained by said computing means, said control means being arranged to vary said second speed according to said sensitivity information;
• and
• f) wherein the amount of movement of the position of the image forming plane relative to the predetermined driving degree of said focusing lens varies according to a change of the position of said focusing lens, the movement of said focusing lens is detected by position detecting means, and wherein said sensitivity information is obtained on the basis of information on the position of said focusing lens detected by said position detecting means.

An optical apparatus comprising:

• a) an optical system having a degree of sensitivity which varies according to the movement of a specific lens in the direction of an optical axis thereof;
• b) driving means for driving a focusing lens;
• c) computing means for obtaining said degree of sensitivity of said optical system;
• d) focus detecting means;
• and
• e) control means for controlling a driving speed of said focusing lens driven by said driving means on the basis of focus information detected by said focus detecting means and said sensitivity degree obtained by said computing means, said control means being arranged to cause said driving means to drive said focusing lens at a first speed and, after that, at a second speed which is lower than said first speed and, then, stop said focusing lens, said control means being arranged to vary said second speed according to said sensitivity degree.

An optical apparatus comprising:

• a) an optical system having a degree of sensitivity which varies according to the movement of a specific lens in the direction of an optical axis thereof;
• b) driving means for driving a focusing lens;
• c) computing means for obtaining said degree of sensitivity of said optical system, said computing means being arranged to obtain said sensitivity degree during the process of driving said focusing lens;
• d) focus detecting means;
• and
• e) control means for controlling a driving speed of said focusing lens driven by said driving means on the basis of focus information detected by said focus detecting means and said sensitivity degree obtained by said computing means, said control means being arranged to cause said driving means to drive said focusing lens at a first speed and, after that, at a second speed which is lower than said first speed and, then, stop said focusing lens, said control means being arranged to vary said second speed according to said sensitivity degree.

An optical apparatus comprising:

• a) an optical system having a degree of sensitivity which varies according to the movement of a specific lens in the direction of an optical axis thereof;
• b) driving means for driving a focusing lens;
• c) computing means for obtaining said degree of sensitivity of said optical system;
• d) focus detecting means;
• e) control means for controlling a driving speed of said focusing lens driven by said driving means on the basis of focus information detected by said focus detecting means and said sensitivity degree obtained by said computing means, said control means being arranged to cause said driving means to drive said focusing lens at a first speed and, after that, at a second speed which is lower than said first speed and, then, stop said focusing lens, said control means being arranged to vary said second speed according to said sensitivity degree;
• and
• f) wherein the movement of said specific lens is detected by position detecting means, and wherein said sensitivity degree is obtained on the basis of information on the position of said specific lens detected by said position detecting means.

An optical apparatus comprising:

• a) an optical system including a focusing lens which is located behind a lens disposed at a fore end of an optical axis of said optical system;
• b) driving means for driving said focusing lens;
• c) first computing means for obtaining sensitivity information concerned with an amount of movement of the position of an image forming plane relative to a predetermined driving degree of said focusing lens which is determined on the basis of the position of said focusing lens;
• d) focus detecting means;
• e) second computing means for determining a driving speed of said driving means, said second computing means being arranged to determine said driving speed on the basis of said sensitivity information obtained by said first computing means;
• and
• f) control means for controlling said driving means according to said driving speed.

An optical apparatus comprising:

• a) an optical system including a focusing lens which is located behind a lens disposed at a fore end of an optical axis of said optical system;
• b) driving means for driving said focusing lens;
• c) first computing means for obtaining sensitivity information concerned with an amount of movement of the position of an image forming plane relative to a predetermined driving degree of said focusing lens which is determined on the basis of the position of said focusing lens, said first computing means being arranged to obtain said sensitivity information during the process of driving said focusing lens;
• d) focus detecting means;
• e) second computing means for determining a driving speed of said driving means, said second computing means being arranged to determine said driving speed on the basis of said sensitivity information obtained by said first computing means;
• and
• f) control means for controlling said driving means according to said driving speed.

An optical apparatus comprising:

• a) an optical system including a focusing lens which is located behind a lens disposed at a fore end of an optical axis of said optical system;
• b) driving means for driving said focusing lens;
• c) first computing means for obtaining sensitivity information concerned with an amount of movement of the position of an image forming plane relative to a predetermined driving degree of said focusing lens which is determined on the basis of the position of said focusing lens which is determined on the basis of the position of said focusing lens;
• d) focus detecting means;
• e) second computing means for determining a driving speed of said driving means, said second computing means being arranged to determine said driving speed on the basis of said sensitivity information obtained by said first computing means;
• f) control means for controlling said driving means according to said driving speed;
• and
• wherein the movement of said focusing lens is detected by position detecting means, and wherein said sensitivity information is obtained on the basis of information on the position of said focusing lens detected by said position detecting means.

An optical apparatus comprising:

• a) an optical system including at least a focusing lens;
• b) driving means for driving said focusing lens;
• c) computing means for obtaining sensitivity information concerned with an amount of movement of the position of an image forming plane relative to a predetermined driving degree of said focusing lens, the amount of movement of the position of the image forming plane relative to the predetermined driving degree of said focusing lens varies according to a change of the position of said focusing lens;
• d) focus detecting means;
• and
• e) control means for causing said driving means to drive said focusing lens at a specific speed and, then, stop said focusing lens, on the basis of focus information obtained by said focus detecting means and said sensitivity information obtained by said computing means, said control means being arranged to vary said specific speed according to said sensitivity information.