Image-pickup apparatus and lens apparatus
AssigneeCanon Kabushiki Kaisha
InventorYuji Tsuda
Life of this patent
Estimating the term…
Abstract
An image pickup apparatus and a lens apparatus capable of photographing high-grade still images even where an interlace type image pickup element is used are to be provided. When an instruction to photograph a still image is entered, a camera microcomputer generates a timing to intercept light coming incident on a lens according to the aperture value of an iris, and transmits this timing to a lens microcomputer. The lens microcomputer supplies a control signal to an aperture control circuit according to the received timing, and a mechanical shutter is caused to operate as the aperture control circuit closes the iris at high speed.
Claims15
An image pickup apparatus on which a lens apparatus provided with an aperture unit for controlling the intensity of light passing a lens with an aperture can be detachably mounted, comprising:
- an image pickup element which converts the optical image of an object having come incident via said lens apparatus into electric signals;
- a brightness information output unit which supplies said lens apparatus with information regarding the brightness of the object on the basis of the electric signals obtained by said image pickup element;
- an aperture value obtaining unit which obtains the aperture value provided by said aperture unit;
- and
- a control unit which, when an instruction to photograph a still image has been entered, generates a timing according to the aperture value obtained by said aperture value obtaining unit to cause said aperture unit to intercept the light having come incident on said lens and transmits said timing to said lens apparatus.
An image pickup apparatus on which a lens apparatus provided with a light shielding unit for intercepting the light having come incident on a lens can be detachably mounted, comprising:
- an image pickup unit which converts the optical image of an object having come incident via said lens apparatus into electric signals;
- and
- a control unit which, when an instruction to photograph a still image has been entered, generates a timing to cause said light shielding unit to intercept the light having come incident on said lens and transmits said timing to said lens apparatus.
A lens apparatus to be detachably mounted on an image pickup apparatus, comprising:
- a lens;
- an aperture unit which controls the intensity of light passing said lens with an aperture;
- and
- an aperture control unit which controls said aperture unit on the basis of information regarding the brightness of the object entered from said image pickup apparatus;
- wherein:
- said aperture control unit, when an instruction to photograph a still image has been entered, causes said aperture unit to intercept the light coming incident on said lens.
A lens apparatus to be detachably mounted on an image pickup apparatus, comprising:
- a lens;
- a light shielding unit which intercepts the light coming incident on said lens;
- and
- a light shielding control unit which, when an instruction to photograph a still image has been entered into said image pickup apparatus, causes said light shielding unit to intercept the light coming incident on said lens.
An image pickup system equipped with an image pickup apparatus and a lens apparatus to be detachably mounted on said image pickup apparatus, wherein:
- said image pickup apparatus has:
- an image pickup element which converts the optical image of an object having come incident via said lens apparatus into electric signals;
- a brightness information output unit which supplies said lens apparatus with information regarding the brightness of the object on the basis of the electric signals obtained by said image pickup element;
- an aperture value obtaining unit which obtains the aperture value provided by said aperture means;
- and
- a control unit which, when an instruction to photograph a still image has been entered, generates a timing according to the aperture value obtained by said aperture value obtaining unit to cause said aperture unit to intercept the light having come incident on said lens apparatus and transmits said timing to said lens apparatus;
- and
- said lens apparatus has:
- a lens;
- an aperture unit which controls the intensity of light passing said lens with an aperture;
- and
- an aperture control unit which controls said aperture unit on the basis of information regarding the brightness of the object entered from said brightness information output unit;
- wherein:
- said aperture control unit, when said timing is entered from said control unit, causes said aperture unit to intercept the light coming incident on said lens.
An image pickup system equipped with an image pickup apparatus and a lens apparatus to be detachably mounted on said image pickup apparatus, wherein:
- said image pickup apparatus has:
- an image pickup element which converts the optical image of an object having come incident via said lens apparatus into electric signals;
- and
- a control unit which, when an instruction to photograph a still image has been entered, generates a timing to cause said light shielding unit to intercept the light having come incident on said lens apparatus to be intercepted and transmits said timing to said lens apparatus;
- and
- said lens apparatus has:
- a lens;
- a light shielding unit which intercepts the light coming incident on said lens;
- and
- a light shielding control unit which, when said timing is entered from said control unit, causes said light shielding unit to intercept the light coming incident on said lens.
A method of controlling the operation of an image pickup apparatus on which a detachable lens apparatus provided with aperture means which controls the intensity of light passing a lens with an aperture is to be mounted, having:
- an image pickup step of converting the optical image of an object having come incident via said lens apparatus into electric signals;
- a brightness information output step of supplying said lens apparatus with information regarding the brightness of the object on the basis of the electric signals obtained at said image pickup step;
- an aperture value obtaining step of obtaining the aperture value provided by said aperture means;
- and
- a control step of generating, when an instruction to photograph a still image has been entered, a timing according to the aperture value obtained at said aperture value obtaining step to cause said aperture means to intercept the light having come incident on said lens and transmitting said timing to said lens apparatus.
A method of controlling the operation of an image pickup apparatus on which a detachable lens apparatus provided with light shielding means which intercepts the light coming incident on a lens, having:
- an image pickup step of converting the optical image of an object having come incident via said lens apparatus into electric signals;
- and
- a control step of generating, when an instruction to photograph a still image has been entered, a timing to cause said light shielding means to intercept the light having come incident on said lens and transmitting said timing to said lens apparatus.
A program to cause a computer to execute control of the operation of an image pickup apparatus on which a lens apparatus provided with aperture means which controls the light coming incident on a lens can be detachably mounted, having:
- an image pickup procedure of converting the optical image of an object having come incident via said lens apparatus into electric signals;
- a brightness information output procedure of supplying said lens apparatus with information regarding the brightness of the object on the basis of the electric signals obtained by said image pickup procedure;
- an aperture value obtaining procedure of obtaining the aperture value provided by said aperture means;
- and
- a control procedure of generating, when an instruction to photograph a still image has been entered, a timing according to the aperture value obtained by said aperture value obtaining unit to cause said aperture means to intercept the light having come incident on said lens and transmitting said timing to said lens apparatus.
A program to cause a computer to execute control of the operation of an image pickup apparatus on which a lens apparatus provided with light shielding means which intercepts the light coming incident on a lens can be detachably mounted, having:
- an image pickup procedure of converting the optical image of an object having come incident via said lens apparatus into electric signals;
- and
- a control procedure of generating, when an instruction to photograph a still image has been entered, a timing to cause said light shielding means to intercept the light having come incident on said lens and transmitting said timing to said lens apparatus.
Dependencies are inferred from the claim text.