摘要:
@ In a recording apparatus comprising a recording head with a multiplicity of individually addressable and energizable point-like radiation sources arranged in staggered parallel rows (24, 25) for irradiating points across a moving photoreceptor, the driver circuits for the different rows of radiation sources are provided by identical chips (35). Each chip incorporates delay means (39, 40) capable of holding data-bit signals for a delay period before the signals are transmitted for energizing the associated radiation sources but is formed so that the delay means can be rendered inoperative by selecting one or other of different mode control voltage input points (51, 52). The control chips for one row (24) of the radiation sources are set in the delay-operative mode to compensate for the distance between the two rows of sources.
摘要:
A LED exposure head for use in a recording apparatus, which comprises an assembly in alignment of a plurality of LED modules (44) with LED arrays (49) and circuit boards (53, 54) mounted on a common base (28), each module extending widthwise over a raised section (43) of the base, and overlapping partly with elongate interconnection circuit strips (45, 46) having connection pads (47) on a line (58) for wire bonded connections (63) with the circuit boards (53, 54).
摘要:
recording apparatus for linewise recording information on a moving photoreceptor by means of a plurality of chips (35) on each of which parallel sub-rows (26,27,28,29) of uniformly spaced radiation sources are formed, wherein a shortcoming of prior art apparatus, namely the impossibility to use chips on which even one radiation source only is defect, is overcome. The apparatus comprises two parallel rows (44,45) of radiation sources (11), each row comprising reserve radiation sources that are arranged with corresponding basic radiation sources of the other group in optical parallelism, and connection circuit means for establishing electrical contact with a basic and/or a reserve radiation source (Figure 5).
摘要:
A recording device for linearly recording information upon a moving photoreceptor, wherein the shortcomings of prior art devices, namely difficulties in the production of defect-free recording heads, and the use of delicate electrical connection structures are overcome. The device comprises a recording head with a plurality of modules (23), each module comprising LED chip means (31) with a length (n) greater than the length (o) of the base plate of the module, and integrated control circuits (34, 35) for the LED's that are mounted on the base plate of the module.
摘要:
A recording apparatus for linewise recording information on a moving photoreceptor, comprising a recording head (10) with two staggered rows (24,25) of pointlike radiation sources and corresponding control means for the radiation sources. A shortcoming of prior art devices, namely stepwise deformation of a recorded line, caused by an incorrect registering of the even and uneven data dots, as a consequence of speed fluctuations of the photoreceptor upon recording, are overcome by controlling the recording of the data signals as a function of a signal from a speed sensor 80 of the photoreceptor.
摘要:
A recording device for linearly recording information upon a moving photoreceptor, wherein the shortcomings of prior art devices, namely difficulties in the production of defect-free recording heads, and the use of delicate electrical connection structures are overcome. The device comprises a recording head with a plurality of modules (23), each module comprising LED chip means (31) with a length (n) greater than the length (o) of the base plate of the module, and integrated control circuits (34, 35) for the LED's that are mounted on the base plate of the module.