Reproduction machine with flash control system

(19)

(11)

EP 0 249 386 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	14.03.1990 Bulletin 1990/11

(43)	Date of publication A2:
	16.12.1987 Bulletin 1987/51

(21)	Application number: 87304886.2

(22)	Date of filing: 03.06.1987

(51)	International Patent Classification (IPC)⁴: G03G 15/052, G03G 15/20, G03B 27/54

(84)	Designated Contracting States:
	DE FR GB IT

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Priority:

09.06.1986 US 872328

(71)	Applicant: XEROX CORPORATION
	Rochester New York 14644 (US)

(72)	Inventors:
	Lehman, Richard Fred Webster New York 14580 (US) Shogren, David Kirk Ontario New York 14519 (US) Hammond, Thomas Joseph Penfield New York 14526 (US) Mason, Lawrence John Penfield New York 14526 (US)

(74)	Representative: Johnson, Reginald George et al
	Rank Xerox Ltd Patent Department Parkway Marlow Buckinghamshire SL7 1YL Marlow Buckinghamshire SL7 1YL (GB)

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References cited: :

(54)	Reproduction machine with flash control system

(57) In a full-frame flash electrophotographic printing machine, an imaging system (16) is provided which incorporates a flash lamp (28) directly coupled to an ac line input via a control circuit (32) to enable document exposure. The imaging system also includes a lens (22) whose movement is synchronized with a moving photoreceptor (10) so that an exposure occurs registered at the same image area of the photoreceptor. The control circuit (32) may comprise a circuit (60) for detecting zero crossing points of the line voltage and for generating signals which are used to trigger the lamp into operation at some point during an 8 msec, half cycle of line operation. A further circuit (66) may be provided for controlling exposure levels to conform to detected density of the document being copied. In a second embodiment, the control circuitry (36) is used to couple the ac line into a flash fuser assembly (100) to fuse a transferred image on an output record medium (40A) (see Figures 12 and 13).

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