Photography – Having variable focal length of camera objective
Reexamination Certificate
2003-03-24
2004-03-30
Perkey, W. B. (Department: 2851)
Photography
Having variable focal length of camera objective
C396S349000, C359S704000, C359S823000, C359S829000
Reexamination Certificate
active
06714730
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a lens barrel holding a lens or a lens group, and a photographing apparatus provided with the lens barrel.
In a camera which is provided with the lens barrel and used for photographing, (hereinafter, described as a photographing apparatus), there is a camera of a type in which the lens barrel holding the lens or lens group is structured so that it can conduct the telescopic motion in the optical axis direction by a plurality of barrel bodies, and the lens held inside the lens barrel is moved and the focusing (hereinafter, described as focusing) or the magnification change is conducted, or after it is used, the lens barrel is retracted and stored in the main body of the photographing apparatus. Such a lens barrel is structured in such a manner that, in an inner periphery or outer periphery of a plurality of barrel bodies constituting the lens barrel, for example, such as the lens barrel holding the lens group, a helicoid mechanism or cam mechanism is provided, and when at least one hand of those barrel bodies is rotated, the barrel bodies are moved each other in the optical axis direction.
Further, in such a lens barrel, there is used the cam or helicoid mechanism to conduct the focusing and magnification change, and the cam and helicoid mechanism to protrude and retract the lens barrel from the stored position (collapsing position) to the operating position, are continuously formed, and the lens barrel structured so that the protruding and retracting operation and the focusing and magnification change operation of the lens barrel can be smoothly conducted by the same drive mechanism.
Then, in such a helicoid or dam, it is conducted that, when a lead angle of a portion at which the protruding and retracting operation is conducted, that is, when a guide angle in the optical direction to the peripheral direction of the lens barrel is largely set, the movement distance to the rotation of the barrel body is made large, and the lens barrel is effectively retracted.
Further, in the photographing apparatus, there is an apparatus provided with an automatic opening and closing type barrier in the forefront portion of the lens barrel, and at the operation time, the barrier is opened and the lens is exposed, and at the time of storing, the barrier is closed and the lens is protected. In this barrier opening and closing mechanism, there is a mechanism structured so that it is operated by being interlocked with the protruding and retracting operation of the lens barrel, and so that, when the retraction of the lens barrel to the storing position is completed, the drive mechanism of the lens barrier is operated, and the barrier is closed.
However, in the photographing apparatus provided with such a lens barrel, in the case where the lens is retracted, when the drive mechanism of the lens barrel is stopped, there is a problem that, by an error of the rotation stop position of the barrel body, the position in the optical axis direction is dislocated, when the retraction of the lens barrel is completed. When there is a dislocation of the position when the lens barrel is retracted, the appearance of the photographing apparatus is injured.
Further, when the barrier operated being interlocked with the protruding and retracting operation of the lens barrel is provided, by the dislocation of the position of the lens barrel when the retraction of the lens barrel is completed, there is also a possibility that the operation error is generated, like that the closing of the barrier becomes imperfect.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a lens barrel and a photographing apparatus equipped therewith by which the dislocation of the stop position when the retraction of the lens barrel is completed, can be reduced.
The above-described object can be attained by any one of Structures (1) to (3).
(1) In the lens barrel, it has the following structure: an outer barrel on an inner peripheral surface of which, a guide section is formed; and an inner barrel which holds a lens and on an outer peripheral surface of which, a guided section engaged with the guide section is formed, and which is moved in the optical axis direction by the rotation of the outer barrel, wherein the guide section has a guiding portion for introducing the inner barrel into a plurality of positions including the operating position and the storing position; and the guiding portion has the first guiding part, and the second guiding part formed so that it is continued to the first guiding part, and has the different lead angle from the first guiding part, and the third guiding part which is continued to the second guiding part and is formed so that it has a lead angle which is smaller than the second guiding part, and has almost the same lead angle as the first guiding part; and at the storing position, the inner barrel is positioned within the area in which the guided section can be engaged with the third guiding part.
(2) In the lens barrel, it has the following structure: an outer barrel on an inner peripheral surface of which, a guide section is formed; and an inner barrel which holds a lens and on an outer peripheral surface of which, a guided section engaged with the guide section is formed, and which is moved in the optical axis direction by the rotation of the outer barrel, wherein the inner barrel can move from the storing position to the operating position; and the guide section has a guiding portion to introduce the inner barrel from the operating position into the storing position; the guiding portion is structured including the first guiding part positioned on the operating position side and the second guiding part formed continuously to the first guiding part; the lead angle of the second guiding part is formed to be larger than 0°, and smaller than the lead angle of the first guiding part; and in the storing position, the inner barrel is positioned within an area in which the guided section can be engaged with the second guiding part.
(3) In the photographing apparatus, it has a lens barrel including the following structure: an outer barrel on an inner peripheral surface of which, a guide section is formed; and an inner barrel which holds a lens and on an outer peripheral surface of which, a guided section engaged with the guide section is formed, and which is moved in the optical axis direction by the rotation of the outer barrel; the guide section has a guiding portion for introducing the inner barrel into a plurality of positions including the operating position and the storing position; and the guiding portion has the first guiding part, and the second guiding part formed so that it is continued to the first guiding part, and has the different lead angle from the first guiding part, and the third guiding part which is continued to the second guiding part and is formed so that it has a lead angle which is smaller than the second guiding part, and has almost the same lead angle as the first guiding part, wherein at the storing position, the inner barrel is positioned within the area in which the guided section can be engaged with the third guiding part; it has a drive means for driving the female helicoid cylinder, and a control means for controlling the drive means; and the control means controls the drive means to move male helicoid cylinder from the storing position to the operating position.
Furthermore, the more preferable Structures (4) to (11) are as follows.
(4) A lens barrel which has: an outer barrel on an inner peripheral surface of which, a guide section is formed; and an inner barrel which holds a lens and on an outer peripheral surface of which, a guided section engaged with the guide section is formed, and which is moved in the optical axis direction by the rotation of the outer barrel; and the lens barrel in which the inner barrel is moved from the storing position to the operating position, the lens barrel is characterized in that: the guide section has a guiding portion for introducing the inner barrel from the op
Horiuchi Hiroyuki
Inoue Naoyuki
Cohen & Pontani, Lieberman & Pavane
Konica Corporation
Perkey W. B.
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