Facsimile and static presentation processing – Static presentation processing – Emulation or plural modes
Reexamination Certificate
1996-06-11
2001-10-16
Popovici, Dov (Department: 2622)
Facsimile and static presentation processing
Static presentation processing
Emulation or plural modes
C358S001200, C358S001900, C358S001140
Reexamination Certificate
active
06304334
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a n execution of an initial sequence of an image forming apparatus.
2. Related Background Art
As one of image forming apparatuses, a color printer for forming a multi-color image by repeating a recording cycle of a plurality of color components has been known.
FIG. 10
shows an example of a control mechanism of such a color printer.
In
FIG. 10
, reference numeral
1
denotes a printer control circuit in which a video signal (VDo)
3
is form ed by an image forming control circuit
2
on the basis of an image signal of each color from a printer controller
11
and is outputted to a driving circuit
4
. The driving circuit
4
is a circuit for driving a semiconductor laser (not sown) and generates a laser driving signal
5
. The image forming control circuit
2
generates a video signal formed from the image signal of each color, allows an electrostatic latent image to be formed onto an image holding member (not shown), and outputs an activating signal
6
to a bias control circuit
7
. High-voltage bias (transfer, development, etc.) information based on the use environment of the apparatus and the image signal of each color from the printer controller
11
has been stored in a storage circuit
10
. The bias control circuit
7
uses bias data in the storage circuit
10
and generates a corresponding bias signal
8
. Thus, the electrostatic latent image is developed and transferred onto a recording paper, thereby forming a multi-color image.
A detecting circuit
13
D informs the image forming control circuit
2
of development cartridge present/absent information
14
or the like from a sensor provided for, for example, a developing device (not shown). An initial sequence control circuit
20
D allows the image forming control circuit
2
to execute an initial sequence in accordance with a turn-on of a power source or an operation to open a door of the printer or the like. Further, the information obtained by the detecting circuit
13
D is notified as information to form an image to the printer controller
11
through a video interface (I/F)
18
.
FIG. 11
shows an initial sequence procedure in a door-open state by the initial sequence control circuit
20
D. As shown in the diagram, a check is made in step S
10
to see if the door is open. If YES, a door open initial sequence procedure is selected (step S
21
), the apparatus waits until the door is closed (step S
14
), and the processing routine is finished. As mentioned above, a predetermined door open initial sequence procedure is executed as an initial sequence process according to the door open/closed state. On the other hand, at the time of the initial process by the turn-on of a power source, a power-ON initial sequence procedure (not shown) which has separately been predetermined is executed.
There is a difference between the two initial sequence procedures mentioned above with respect to a point that, although the initialization is performed to the whole area in an RAM in the power-ON state, the initialization is performed to only a part of the area in the RAM in the door open state (data in the other area is held as it is at the preceding time). This is because in the initial sequence procedure, the RAM area to be cleared when the power is ON is made different from that when the door is open, thereby making it unnecessary to purposely reset a command which is needed at the time of the initial process and reducing the processing time.
However, as initial processes to be actually executed, in addition to the above-mentioned initial process in the power-ON state and initial process in the door open state, there are a detecting process about the presence or absence of a development cartridge or a photosensitive drum, a maximum image density (Dmax) control process, an image density halftone control process, and the like. Since the above processes are always executed when the door open/closed state is confirmed, it takes at least 100 seconds or more as a time which is required for all of the initial processes. Therefore, there is a problem such that even when the door is opened or closed for a mere jam process or the like, a predetermined initial processing time is needed.
SUMMARY OF THE INVENTION
It is an object of the invention to provide an image forming apparatus and its control method in which the above-mentioned drawbacks are eliminated.
Another object of the invention is to provide an image forming apparatus and its control method in which the optimum initial sequence can be selected in accordance with a loading state of a detachable processing member of an image forming apparatus and a time which is required for initial processes can be reduced.
Further another object of the invention is to provide an image forming apparatus and its control method in which an initial sequence according to a life detection of a processing member of an image forming apparatus is executed, thereby maintaining a picture quality and reducing a time which is required for initial processes.
The above and other objects and features of the present invention will become apparent from the following detailed description and the appended claims with reference to the accompanying drawings.
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Canon Kabushiki Kaisha
Fitzpatrick ,Cella, Harper & Scinto
Popovici Dov
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