Viewfinder apparatus for camera
First Claim
1. A viewfinder apparatus for a camera including a viewfinder optical system independent of a photographic optical system, comprising:
- a correction amount-calculating means for calculating a correction amount of parallax between said photographic optical system and said viewfinder optical system on the basis of information concerning at least one of a focal length of said photographic optical system and an object'"'"'s distance;
a field frame for defining a reference visual field of said viewfinder optical system;
a field-correcting frame for correcting the visual field defined by said field frame; and
a field variable mechanism for moving said field-correcting frame in a direction normal to an optical axis of said viewfinder optical system and in a direction of said viewfinder optical system in accordance with said correction amount of parallax calculated by said correction amount-calculating means;
wherein said field-correcting frame can be visually observed at a plurality of different positions in the visual field of said viewfinder optical system, said field-correcting frame covering a different portion of the visual field of said viewfinder optical system and disposed at a different point relative to the optical axis of said viewfinder optical system at each of said plurality of positions.
1 Assignment
0 Petitions
Accused Products
Abstract
Disclosed is a viewfinder apparatus for a camera, comprising: a curvilinear image-forming surface in a viewfinder optical system independent of a photographic optical system; a field frame disposed adjacent to the image-forming surface for defining a reference field of view, the field frame being formed into a curvilinear shape such as to match in profile with the image-forming surface; a field-correcting frame for correcting the field of view defined by the field frame, the field-correcting frame being supported on an arm portion that is pivoted about a revolving shaft in a direction normal to an optical axis of the viewfinder optical system, the field-correcting frame being formed into a curvilinear shape such as to correspond in profile with the image-forming surface; and a motor for driving the field-correcting frame into movement along the image-forming surface, whereby the field-correcting frame of the viewfinder optical system is invariably viewed.
33 Citations
23 Claims
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1. A viewfinder apparatus for a camera including a viewfinder optical system independent of a photographic optical system, comprising:
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a correction amount-calculating means for calculating a correction amount of parallax between said photographic optical system and said viewfinder optical system on the basis of information concerning at least one of a focal length of said photographic optical system and an object'"'"'s distance;
a field frame for defining a reference visual field of said viewfinder optical system;
a field-correcting frame for correcting the visual field defined by said field frame; and
a field variable mechanism for moving said field-correcting frame in a direction normal to an optical axis of said viewfinder optical system and in a direction of said viewfinder optical system in accordance with said correction amount of parallax calculated by said correction amount-calculating means;
wherein said field-correcting frame can be visually observed at a plurality of different positions in the visual field of said viewfinder optical system, said field-correcting frame covering a different portion of the visual field of said viewfinder optical system and disposed at a different point relative to the optical axis of said viewfinder optical system at each of said plurality of positions. - View Dependent Claims (2, 3, 4, 5)
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6. A viewfinder apparatus for a camera, comprising:
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a viewfinder optical system separate from a photographic optical system for photographing an image of an object;
a field-correcting frame for correcting a parallax between said photographic optical system and said viewfinder optical system; and
a driving mechanism for directing said field-correcting frame in a direction substantially normal to an optical axis of said viewfinder optical system, and in a direction of the optical axis of said viewfinder optical system;
wherein said field-correcting frame can be visually observed at a plurality of different positions in the visual field of said viewfinder optical system, said field-correcting frame covering a different portion of the visual field of said viewfinder optical system and disposed at a different point relative to the optical axis of said viewfinder optical system at each of said plurality of positions. - View Dependent Claims (7, 8, 9)
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10. A camera including a viewfinder apparatus, comprising:
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a viewfinder optical system, through which an object can be visually observed; and
a display member movable both in a direction substantially normal to an optical axis of said viewfinder optical system and in a direction of said optical axis of said viewfinder optical system, said display member being inserted into a visual field of said viewfinder apparatus, thereby allowing said display member to be visually observed, wherein said display member can be visually observed at a plurality of different positions in the visual field of said viewfinder optical system so that a different field range is represented when said display member is stationary at each of said plurality of positions, said field-correcting frame covering a different portion of the visual field of said viewfinder optical system and disposed at a different point relative to the optical axis of said viewfinder optical system at each of said plurality of positions. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
a photographic optical system independent of said viewfinder optical system;
a distance-measuring device for measuring a distance of an object;
an arithmetic operating means for calculating a correction amount of parallax between said photographic optical system and said viewfinder optical system on a basis of a measurement result from said distance-measuring device and a focal length of said photographic optical system; and
a driving mechanism for driving said field-correcting frame in response to a calculation result from said arithmetic operating means.
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14. The camera including a viewfinder apparatus of claim 13, wherein said field-correcting frame can be located at a plurality of positions in accordance with said calculation result from said arithmetic operating means.
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15. The camera including a viewfinder apparatus of claim 13, wherein said viewfinder optical system includes an objective optical system for forming an image of an object, a reversing optical system for converting such a formed image of the object into an erect image, and an ocular optical system for visually observing the formed image of the object on a magnified scale, and wherein said field-correcting frame is moved in a direction of an optical axis of said viewfinder optical system in such a manner that said field-correcting frame and said image of said object formed by means of said objective optical system are visually observed at substantially the same diopter at any position midway along a course of movement of said field-correcting frame in a direction substantially normal to said optical axis of said viewfinder optical system.
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16. The camera including a viewfinder apparatus of claim 13, wherein said photographic optical system and said viewfinder optical system form a magnifying power-changing optical system comprising:
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a magnifying power change-driving mechanism for changing respective magnifying powers of said photographic optical system and said viewfinder optical system; and
a focal length-detecting means for detection of a state in which said magnifying power of said photographic optical system is changed, wherein said arithmetic operating means calculates a correction amount of parallax between said viewfinder optical system and said photographic optical system on a basis of output from said focal length-detecting means and output from said distance-measuring device.
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17. The camera including a viewfinder apparatus of claim 16, further comprising:
- a driving source for driving said driving mechanism and said magnifying power change-driving mechanism.
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18. The camera including a viewfinder apparatus of claim 13, wherein said field-correcting frame is rotationally moveable.
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19. A camera including a viewfinder apparatus, comprising:
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a viewfinder optical system for visually observing an image of an object;
a field frame for defining a field range of said viewfinder apparatus; and
a field-correcting frame for changing the field range defined by said field frame, wherein said field-correcting frame can be visually observed at a plurality of different positions in the visual field of said viewfinder optical system so that a different field range is represented when said field-correcting frame is stationary at each of said plurality of positions, said field-correcting f&
me covering a different portion of the visual field of said viewfinder optical system, and disposed at a different point relative to the optical axis of said viewfinder optical system at each of said plurality of positions.- View Dependent Claims (20, 21, 22, 23)
a distance-measuring device for measuring a distance of said object;
an arithmetic operating means for calculating a correction amount of parallax between said photographic optical system and said viewfinder optical system on a basis of information regarding at least one of a measurement result from said distance-measuring device and a focal length of said photographic optical system; and
a driving mechanism for driving said field-correcting frame, wherein said field-correcting frame is driven in accordance with a calculation result from said arithmetic operating means.
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22. The camera including a viewfinder apparatus of claim 19, wherein said photographic optical system has a single focal length;
- and further comprising;
a distance-measuring device for measuring a distance of said object;
an arithmetic operating means for calculating a correction amount of parallax between said photographic optical system and said viewfinder optical system on a basis of a measurement result from said distance-measuring device; and
a driving mechanism for driving said field-correcting frame, wherein said field-correcting frame is driven in accordance with a calculation result from said arithmetic operating means.
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23. The camera including a viewfinder apparatus of claim 21, wherein said photographic optical system is a magnifying power-changing optical system comprising:
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a photographic optical system'"'"'s magnifying power-changing mechanism for changing a magnifying power of said photographic optical system; and
a detecting means for detecting a focal length of said photographic optical system, wherein said arithmetic operating means calculates a correction amount of parallax on a basis of a measurement result from said distance-measuring device and a detection result from said detecting means.
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Specification