JPH0250345U - - Google Patents

Description

[Brief explanation of drawings]

1 to 13 show one embodiment of this invention, and each figure represents the following. Fig. 1 is a side structural diagram of the digital electronic copying device, Fig. 2 is a sectional view of Fig. 1, Fig. 3 is an explanatory diagram of the structure of the document table, and Fig. 4 is a block diagram of the configuration of the signal processing section. , Fig. 5 is a block diagram of the sampling timing generation circuit for enlarged images and the threshold level generation section, Fig. 6 is a write/read circuit diagram for normal and mirror images, and Fig. 7 is a sampling clock for reduction. Figure 8 is a circuit diagram for central printing control (in the case of normal image), Figure 9 is a strobe generation circuit diagram, Figure 10 is a block diagram of the strobe width monitoring section,
Fig. 11 is a perspective view of the thermal head, Fig. 12 is a configuration diagram of the thermal head, Fig. 13A is an explanatory diagram of the operation showing the overlap of recording pixels when reducing in the sub-scanning direction without strobe width control, Fig. 13 B is an explanatory diagram showing the operation of recording pixels when strobe width is controlled in response to sub-scanning feed.

Claims (1)

[Claims for Utility Model Registration] (1) An image sensor unit that converts the image information of a document into an electrical signal and outputs it, a signal processing section that encodes and processes this electrical signal, and a large number of heating resistors corresponding to the number of pixels. and a recording section that receives an image signal from the signal processing section and prints on thermal recording paper, the image forming apparatus generating a strobe pulse that controls the amount of heat generated by a heating resistor of the recording section. A CPU, a frequency dividing circuit for setting a predetermined strobe width, a transmitting circuit for switching and transmitting this strobe signal for each block, a strobe width monitoring circuit for monitoring this strobe signal, the frequency dividing circuit and the strobe width monitoring circuit. An image forming apparatus comprising: a latch circuit that resets the strobe width; and a gate circuit that closes the gate when the strobe width monitoring circuit times out. (2) Registration of a utility model characterized by a lock mode in which strobe generation is continued in an interrupted state due to time-up of the strobe width monitoring circuit, and a natural recovery mode in which a natural recovery is possible after interruption. An image forming apparatus according to claim 1.