Automatic masking device including an aperture extension means
First Claim
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1. An automatic masking device for use in a printer, comprising:
- a photosensitive film sheet holder on which a photosensitive film sheet is to be held;
a pair of masking plates which are arranged in front of the photosensitive film sheet holder, and are adapted to be movable over the surface of the holder so as to open and close an aperture between the masking plates, and which are adapted to be set to form an aperture of a predetermined size; and
an aperture extending means which is capable of temporarily extending the aperture beyond the predetermined size to enable the operator to visually check the marginal area surrounding said aperture of predetermined size prior to making the exposure, and of then automatically returning the aperture to the predetermined size.
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Abstract
An automatic masking device including an aperture extension means for use in a printer, wherein a reproduction picture to be projected onto a photosensitive film sheet mounted on a holder is masked by masking plates which are arranged in front of the holder, and are adapted to be movable over the surface of the holder so as to open and close an aperture between the masking plates, and which are adapted to be settled to form the aperture of the predetermined size, and wherein the aperture extension means is capable of extending the aperture beyond the predetermined size and of returning it to the predetermined size.
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Citations
6 Claims
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1. An automatic masking device for use in a printer, comprising:
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a photosensitive film sheet holder on which a photosensitive film sheet is to be held; a pair of masking plates which are arranged in front of the photosensitive film sheet holder, and are adapted to be movable over the surface of the holder so as to open and close an aperture between the masking plates, and which are adapted to be set to form an aperture of a predetermined size; and an aperture extending means which is capable of temporarily extending the aperture beyond the predetermined size to enable the operator to visually check the marginal area surrounding said aperture of predetermined size prior to making the exposure, and of then automatically returning the aperture to the predetermined size. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification