Data recording means for use in a single lens reflex camera
AssigneeFuji Photo Film Co., Ltd.
InventorSusumu Fujita
Life of this patent
Estimating the term…
Abstract
Data recording for a single lens reflex camera which comprises a data carrier assembly which carries at least two identical sets of data, a constant positional relationship being maintained between corresponding data items in the two sets. In any setting of the data carrier assembly a data item in one set is brought to a recording position from which the image of the data item is directed onto film material when the camera shutter is actuated, and the corresponding data item in the other set is brought to a viewing position from which the image thereof is constantly transmitted to the viewfinder eye-lens.
Claims7
In a camera comprising a taking lens assembly, shutter means and a viewfinder system including a mirror which is normally disposed at an angle of 45.degree. with respect to the optical axis of said taking lens system and positioned between said taking lens system and the frame of a film located at an exposure station and for directing image-wise light reflected from an external scene upwards to and through a focussing screen and into a pentaprism, said pentaprism having lower and rear surfaces which are transparent, and having at least the major portions of the other surfaces externally silvered and which causes said image-wise light to be directed to the eye-lens of the viewfinder system, and means for moving said mirror temporarily to a horizontal position to permit exposure of said film frame to said image-wise light upon actuation of said shutter means, and data recording means, the improvement wherein said data recording means comprises:
- data carrier means constituted by at least one disk means which is rotatably mounted adjacent to said pentaprism and defines at least two identical series of data items, the same positional relationship on said disk means being maintained between all corresponding items of data in said series whereby when said disk means is rotated to bring one of said items of data in one of said series to a first position, a corresponding item of data in other said series is brought to a second position;
- a data recording optical system including at least a lens means for focussing on said film frame the image of a data item positioned at said first position;
- and
- a data viewing optical system which directs the image of a data item at said second position from said second position along an optical path which lies forward of the base portion of said pentaprism, through a small transparent portion in the lower front surface of said pentaprism, and through said pentaprism to said eye-lens.
In a camera comprising a taking lens assembly, shutter means and a viewfinder system including a mirror which is normally disposed at an angle of 45.degree. with respect to the optical axis of said taking lens system and positioned between said taking lens system and the frame of a film located at an exposure station and for directing image-wise light reflected from an external scene upwards to and through a focussing screen and into a pentaprism whose lower and rear surfaces are transparent, and at least the major portions of the other surfaces of which are externally silvered and which causes said image-wise light to be directed to the eye-lens of the viewfinder system, and means for moving said mirror temporarily to a horizontal position to permit exposure of said film frame to said image-wise light upon actuation of said shutter means, and data recording means, the improvement wherein said data recording means comprises:
- data carrier means constituted by at least one disk means which is rotatably mounted adjacent to said pentaprism and defines at least two identical series of data items, the same positional relationship on said disk means being maintained between all corresponding items of data in said series whereby when said disk means is rotated to bring one of said items of data in one of said series to a first position, a corresponding item of data in other said series is brought to a second position;
- light source means which is actuable upon actuation of said shutter means to illuminate a data item brought to said first position;
- a data recording optical system including at least a lens means for focussing on said film frame the image of an illuminated data item positioned at said first position;
- illumination means for illumination of a data item positioned at said second position;
- a data viewing optical system which directs the image of an illuminated data item at said second position from said second position along an optical path which lies forward of the base portion of said pentaprism, through a small transparent portion in the lower front surface of said pentaprism, and through said pentaprism to said eye-lens;
- and
- externally actuable data setting means actuable to cause said data carrier means to bring successive corresponding data items to said first and second positions.
Dependencies are inferred from the claim text.