Inner drum type image recording device
AssigneeFuji Photo Film Co., Ltd.
InventorsHajime Morita, Yuji Tanaka
Life of this patent
Estimating the term…
Abstract
An inner drum type image recording device is provided which, in exposure of a photosensitive lithographic printing plate, eliminates unnecessary light (reflected scattered light) other than light for main exposure, and eliminates fluctuations in a dot percent. By limiting baffles to a minimum number of positions necessary, fluctuations in the dot percent caused by reflected scattered light are suppressed, and a sufficient space needed for maintenance work on a spinner mirror and the like can be ensured. Further, by making the baffle fan-shaped and disposing the baffle at a periphery of the spinner mirror, light of a subscanning component of reflected scattered light can be reliably blocked.
Claims21
A device for use in recording an image on a recording medium with a light beam, the device comprising:
- a support having a surface for supporting the recording medium;
- a shaft provided substantially parallel to the surface of the support;
- a mirror provided so as to be rotatable around the shaft and movable along the shaft, and while reflecting the light beam onto the recording medium, the mirror carrying out main scanning by rotating around the shaft and subscanning by moving along the shaft, the mirror having opposite sides along a direction of the subscanning;
- and
- a shield provided to be movable with the mirror, on only one side of the mirror, for blocking scattered reflections of the light beam from the mirror.
An inner drum type image recording device for use in recording an image on a recording medium with a light beam, the device comprising:
- a support having an arcuate cross-section, with an inner peripheral surface for receiving the recording medium in contact therewith;
- a spinner mirror provided so as to be rotatable around an axis extending substantially parallel to the inner peripheral surface of the support, and due to the spinner mirror rotating, the light beam radiating from a direction substantially parallel to said axis is reflected for performing main scanning of the recording medium received on the inner peripheral surface of the support, and while the recording medium is being main scanned, the spinner mirror moves lengthwise along the axis for performing subscanning of the recording medium such that an image is recorded on the recording medium in accordance with the reflected light beam;
- and
- a baffle provided along a direction from which the light beam radiates, between the spinner mirror and the light beam for blocking scattered reflections of the light beam from the mirror, the mirror including a rear side facing away from the baffle towards a space substantially devoid of structure for blocking scattered reflections of the light beam reflected by the mirror.
A method for blocking scatter reflections of a light beam from a spinner mirror in a drum type image recording device having a drum in which a recording medium is received, the method comprising:
- (a) main scanning the recording medium in the drum by receiving the light beam with the spinner mirror and rotating the spinner mirror to reflect the light beam circumferentially, relative to the drum, along the recording medium;
- (b) subscanning the recording medium by moving the spinner mirror lengthwise along the drum, while performing main scanning to reflect the light beam transversely, relative to a direction in which main scanning is performed, along the recording medium;
- (c) moving a light shield in correspondence with the mirror to impede optical paths in reflection scatter directions from the mirror to sections of the recording medium which have been main scanned with the light beam;
- and
- (d) leaving optical paths in reflection scatter directions substantially unimpeded from the mirror to sections of the recording medium, which have not been main scanned.
Dependencies are inferred from the claim text.