ND filter and aperture device using the same
First Claim
1. An aperture device having a ND filter being attached to a moveable member for adjusting a light amount, said ND filter being formed to have different transmission rates depending on regions,said ND filter being formed from a developed film on which an original having a reflection darkness distribution having a predetermined relationship with said different transmission rates has been photographed by a camera, said film comprising a base having a transmission rate of not less than 80%, and an anti-halation layer, wherein said ND filter movably interlocks with a movable aperture member.
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Accused Products
Abstract
A plurality of darkness distributions having a predetermined relationship with a darkness distribution for ND-filtering transmission light at the position of an aperture blade in an aperture device are formed on an original. The original is photographed on a film by a camera, and after the film is developed, the film is molded to obtain a plurality of ND filters.
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Citations
38 Claims
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1. An aperture device having a ND filter being attached to a moveable member for adjusting a light amount, said ND filter being formed to have different transmission rates depending on regions,
said ND filter being formed from a developed film on which an original having a reflection darkness distribution having a predetermined relationship with said different transmission rates has been photographed by a camera, said film comprising a base having a transmission rate of not less than 80%, and an anti-halation layer, wherein said ND filter movably interlocks with a movable aperture member.
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8. An aperture device having a ND filter being attached to a moveable member for adjusting a light amount, said ND filter comprising:
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an original having a darkness distribution having a predetermined relationship with a darkness distribution for providing a ND filtering function; and a diazo film exposed with an ultraviolet ray representing said darkness distribution of said original, wherein said diazo film is developed and said developed film is cut in a form of a plurality of ND filters having the same density distribution. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. An aperture device in which a ND filter is attached to an aperture blade,
said ND filter being arranged by a method comprising the steps of: -
preparing an original having a darkness distribution having a predetermined relationship with a darkness distribution for providing a ND filtering function; exposing a film with light representing said darkness distribution of said original; developing said exposed film; and cutting said developed film in a form of said ND filter, said cutting step including the step of obtaining a plurality of said ND filters having the same density distribution, wherein a width of said ND filter is decreased in a direction in which a darkness is increased. - View Dependent Claims (16, 17, 18, 19)
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20. An aperture device in which a ND filter is attached to an aperture blade,
said ND filter being arranged by a method comprising the steps of: -
preparing an original having a darkness distribution having a predetermined relationship with a darkness distribution for providing a ND filtering function; exposing a film with light representing said darkness distribution of said original; developing said exposed film; and cutting said developed film in a form of said ND filter, said cutting step including the step of obtaining a plurality of said ND filters having the same density distribution, wherein said darkness distribution is formed so that a transmission rate of said ND filter changes stepwise. - View Dependent Claims (21, 22, 23, 24)
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25. An aperture device in which a ND filter is attached to an aperture blade,
said ND filter being arranged by a method comprising the steps of: -
preparing an original having a darkness distribution having a predetermined relationship with a darkness distribution for providing a ND filtering function; exposing a film with light representing said darkness distribution of said original; developing said exposed film; and cutting said developed film in a form of said ND filter, said cutting step including the step of obtaining a plurality of said ND filters having the same density distribution, wherein said darkness distribution is formed so that a transmission rate of said ND filter changes gradually. - View Dependent Claims (26, 27, 28, 29, 30)
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31. An aperture device in which a ND filter is attached to an aperture blade,
said ND filter being arranged by a method comprising the steps of: -
preparing an original having a darkness distribution having a predetermined relationship with a darkness distribution for providing a ND filtering function; photographing said original by a camera to expose micro-copy film; developing said exposed film; and cutting said developed film in a form of said ND filter, wherein a width of said ND filter is decreased in a direction in which a darkness is increased. - View Dependent Claims (32)
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33. An aperture device in which a ND filter is attached to an aperture blade,
said ND filter being arranged by a method comprising the steps of: -
preparing an original having a darkness distribution having a predetermined relationship with a darkness distribution for providing a ND filtering function; photographing said original by a camera to expose a micro-copy film; developing said exposed film; and cutting said developed film in a form of said ND filter, wherein a plurality of lines of darkness distribution regions are formed on said original, a plurality of lines of darkness distribution regions are also formed on said developed film, and a large number of ND filters are obtained by cutting said film in units of lines of said plurality of lines of darkness distribution regions. - View Dependent Claims (34)
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35. An aperture device in which a ND filter is attached to an aperture blade,
said ND filter being arranged by a method comprising the steps of: -
preparing an original having a darkness distribution having a predetermined relationship with a darkness distribution for providing a ND filtering function; photographing said original by a camera to expose a micro-copy film; developing said exposed film; and cutting said developed film in a form of said ND filter, wherein said darkness distribution is formed, so that a transmission rate of said ND filter changes stepwise. - View Dependent Claims (36)
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37. An aperture device in which a ND filter is attached to an aperture blade,
said ND filter being arranged by a method comprising the steps of: -
preparing an original having a darkness distribution having a predetermined relationship with a darkness distribution for providing a ND filtering function; photographing said original by a camera to expose a micro-copy film; developing said exposed film; and cutting said developed film in a form of said ND filter, wherein said darkness distribution is formed, so that a transmission rate of said ND filter changes gradually. - View Dependent Claims (38)
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Specification