Display device in image forming apparatus

Abstract: A display device in an image forming apparatus includes a liquid crystal display panel (11). The display panel (11) selectively displays two types of modes, that is, a normal mode and a special mode. In the normal mode, a copy volume, a copying magnification, a copy density and the like are displayed. In the special mode, the contents for setting edit copies, the contents for setting composite copies and the like are displayed. The special mode is displayed during only a predetermined time period in the event that one of special mode setting keys (21 - 31) is operated. In other cases, the display mode is automatically switched to the normal mode. More specifically, the normal mode which a user desires to know is usually displayed on the display panel (11). Only when the user sets the special mode, is the special mode displayed in response to an operation of one of the special mode setting keys (21 - 31).

Description: The present invention relates to display devices in image forming apparatuses such as electrophotographic copying apparatuses and facsimiles. In recent years, electrophotographic copying apparatuses have been adapted to perform multiple functions, that is, to be able to make not only normal copies but also various copies such as enlarged copies and reduced copies, edit copies such as partial erasing and partial extraction, composite copies and duplex copies. Therefore, the conventional electrophotographic copying apparatuses performing multiple functions include, in many cases, those adapted such that there are provided, as display devices, a normal mode display device for displaying the contents necessarily required for a copying operation, such as a copy volume and a copy density, and a special mode display device for displaying the contents for setting the edit copies, the contents for setting the composite copies, and the like. Furthermore, as another example, the conventional electrophotographic copying apparatuses include those adapted such that a single display device is used both as a normal mode display device and a special mode display device to display an appropriate display mode using a display switching button. There is known from JP-A-62255965 a copying apparatus having a display system capable of displaying a plurality of modes, a mode setting means and an operation mode setting means. The display system is of the aforementioned type having two display units, one of which is used to form graphic displays and the other of which is used to form fixed displays. This system therefore has two kinds of display device, namely a normal mode display device for displaying the contents necessarily required for an image forming operation and a special mode display device. There is known from JP-A-62255971 a copying apparatus which like that of JP-A-62255965, again has two display units, one of normal mode displays and the other for special mode displays. There is known from JP-A-62011875 a copying apparatus whose display system has only one display unit. Specified areas of this display unit are used for displaying the number of sheets in the normal mode while being used for setting the anamofic magnification percentage and the margin size in a special mode. The display unit does not display only the contents of the special mode when the special mode is selected, a large part of the display unit being divided in a display portion for the normal made only and another portion for the special mode only. The known electrophotographic copying apparatuses in which two display devices are provided for respectively displaying the normal mode and the special mode have the disadvantages that the displays take up a lot of space and are high in cost. On the other hand, the known electrophotographic copying apparatuses in which a single display device can display both the normal mode and the special mode by switching do not have the above described disadvantages but have the disadvantage of inferior operability. Not only electrophotographic copying apparatuses but also fascimiles adapted to perform multiple functions have the above described disadvantages. A primary object of the present invention is to eliminate the above described disadvantages and to provide a display device in an image forming apparatus capable of displaying a plurality of modes by a single display device with good operability. The present invention is directed to a display device provided in an image forming apparatus for displaying predetermined data, comprising a single display means capable of selectively displaying a first mode and a plurality of second, special modes and normally displaying the first mode, the display means displaying as said first mode the contents necessarily required for an image forming operation; a second, special mode being selected by operation of any of a plurality of special mode selecting keys wherein, when a special mode is selected by operation of one of said special mode selecting keys, the display means displays only the contents of the selected special mode corresponding to that key; a special mode setting means actuation of which, while said display means displays the contents of a selected special mode, inputs as the contents of operation the contents corresponding to that selected special mode; and automatic display switching means which is responsive to the actuation of the special mode setting means to automatically switch the display of the display means from the selected one of the special modes to said first mode, in which the contents necessarily required for an image forming operation are displayed. Thus in a case where the display means displays the second mode, if the operation mode of the image forming apparatus is set based on the contents of the second mode, the display mode is then automatically switched to the first mode. More specifically, the contents displayed in the display device can be automatically switched to the contents which a user desires to know. In particular, a particular mode is set and displayed and then, the display mode is automatically switched to a general mode indicative of an operating state of the device. Accordingly, there can be provided a display device convenient for the user. The invention is described further hereinafter, by way of example only, with reference to the accompanying drawings, wherein: Fig. 1 is a plan view illustrating the operation panel of an electrophotographic copying apparatus according to one embodiment of the present invention; Fig. 2 is a diagram showing an example of the contents displayed in a display portion; Fig. 3 is a block diagram showing the construction of the control circuit of the display portion; and Fig. 4 is a flow chart illustrating a display control operation of the display portion of the electrophotographic copying apparatus according to one embodiment of the present invention. Fig. 1 is a plan view illustrating an operation panel 10 of an electrophotographic copying apparatus according to one embodiment of the present invention. The operation panel 10 is provided with a display portion 11. A liquid crystal display panel having a plurality of dots arranged in a longitudinal and lateral matrix is employed as this display portion 11. Arbitrary dots enter the displayed state in response to an applied signal, so that the data is displayed in the liquid crystal display panel. The display of data on the operation panel 10 is limited to this display portion 11 only. On the operation panel 10, there are further arranged a ten-key array 12 for entering numeric data such as the copy quantity a clear/stop key 13 operated when the numeric data erroneously entered by the ten-key 12 is cleared and when it is desired to stop a copying operation in the course thereof, a print start key 14 for indicating the start of the copying operation, a copy density setting key 15 for setting the copy density, a copy paper selection key 16 for selecting the size of the copy paper, an all clear key 17 for clearing all data set in the electrophotographic copying apparatus, a preheat key 18 for switching the electrophotographic copying apparatus between the preheat state and the standby state, and an interruption key 19 used for interrupting copying. In addition, a mode confirmation key 20 for switching the contents displayed in the display portion 11 to confirm a set mode is provided on the operation panel 10. The mode confirmation key 20 is used for switching the contents displayed in the display portion 11 to the special mode only during the time period during which the key 20 is depressed. Various keys for setting the special mode are arranged on the operation panel 10. More specifically, there are arranged a magnification setting key 21, a duplex copy setting key 22, a margin setting key 23, a frame erase instruction key 24, an edit key 25 for setting edit copies, a composite copy setting key 26, a timer operation/release key 27, a cover copy setting key 28 operated when it is desired to change the color of only the first copy sheet in making a plurality of copies, an OHP copy setting key 29 operated when copies are made on a film for an overhead projector, a program memory key 30, a language switching key 31 for switching the display language in the display portion 11, a setting end key 32, and an indication key 33. A special copy mode can be set by the various special mode setting keys. The contents of the special mode set are displayed in the display portion 11 when each of the special mode setting keys is operated. The special mode setting keys may be permanently exposed on the operation panel 10. Alternatively, the special mode setting keys may be normally covered with, for example, a transparent cover and the cover may be opened in using the special mode setting keys in consideration of the low frequency of use. Additionally, a sorter switching key 34 for controlling a sorter portion connected to the electrophotographic copying apparatus is provided on the operation panel 10. The electrophotographic copying apparatus further comprises a sub panel 35 in addition to the operation panel 10. This sub panel 35 is provided in a place which a user does not usually touch, for example, inside the front door of the electrophotographic copying apparatus. Accordingly, unless the front door is opened, the sub panel 35 can not be operated. A weekly timer set key 36 and a copy volume management set key 37 are provided on the sub panel 35. The weekly timer set key 36 is used for setting times when the power supply of the electrophotographic copying apparatus is turned on and off over one week. For example, from Monday to Friday, the power supply of the electrophotographic copying apparatus is turned on at eight in the morning while being turned off at five in the evening. The copy volume management set key 37 is used for setting or confirming the situation where a copy volume is managed for each department when a plurality of departments use the electrophotographic copying apparatus. When the keys 36 and 37 are operated, the contents set by the key operations are also displayed in the display portion 11. Fig. 2 is a diagram showing a specific example of the contents displayed in the display portion 11. Fig. 2 (A) shows an example of the display of the normal mode. The contents displayed include the display "Copying is ready.", the display of the number of copies "12", the display of a magnification "100 %" indicating that an equal size magnification is selected, the display of the copy density and the display of the kind of the selected copy paper, and the like. Fig. 2 (B) shows a specific example of the display of the special mode. This display is an example of the display in a case where the duplex copy setting key 22 of the special mode setting keys is operated. At the time of this display, desired contents are selected from the the contents displayed in the left-hand column by the indication key 33, and the setting end key 32 is depressed. Then, the display in the display portion 11 is changed to the display shown in Fig. 2 (C). Fig. 2 (C) shows the display indicating that the selected contents, that is, "a duplex to duplex copy "mode", is set as an operation mode. Fig. 3 is a block diagram showing an example of the construction of the control circuit of the operation panel 10. The display portion 11 and various keys provided on the operation panel 10 are connected to a CPU (central processing unit) 41 through an I/O interface 40. In addition, a sub panel 35 is also connected to the CPU 41 through the I/O interface 40. The CPU 41 is connected to a ROM (read only memory) 42 storing operation programs of the CPU 41 and a RAM (random access memory) 43 to and from which data can be written at the time of arithmetic processing and the written data can be read out as required. The CPU 41 may only control the operation panel 10 and the sub panel 35 in the electrophotographic copying apparatus. Alternatively, the CPU 41 may simultaneously control other mechanisms of the electrophotographic copying apparatus. In the present embodiment, the latter is employed. Fig. 4 is a flow chart for explaining an operation of the control circuit shown in Fig. 3. Referring now to Figs. 1 to 4, description is made of a display control operation of the display portion 11 according to the present embodiment. The display control operation of the display portion 11 can be carried out by, for example, interruption processing for each constant cycle while the other mechanisms of the electrophotographic copying apparatus are controlled. When the control is started, the CPU 41 determines whether the display mode of the display portion 11 is the normal mode as shown in Fig. 2 (A) or the special mode as shown in Fig. 2 (B) (step S1). If the special mode is displayed, the CPU 41 determines whether or not an input signal is applied from the setting end key 32 out of the special mode setting keys (step S2). If the input signal is applied from the setting end key 32, the CPU 41 displays the end of setting of the special mode shown in Fig. 2 (C) (step S3), and sets a one-second timer by a soft timer using the RAM 43 (step S4). The set time of this soft timer may be a time having a suitable length other than one second. The CPU 41 counts down the soft timer (step S5). In response to the full count of the timer (step S6), the CPU 41 switches the display mode of the display portion 11 to the normal mode as shown in Fig. 2 (A) (step S7). The display portion 11 is controlled in the above described manner. Accordingly, after the special mode is set, the special mode is automatically switched to the normal mode after a lapse of a constant time period, for example, one second. Consequently, the contents of the special mode set are displayed at the time of setting the special mode and then the operating state of the electrophotographic copying apparatus, which a user usually desires to confirm, is displayed in the normal mode. Although in the above described embodiment, description was made of a case in which the display mode of the display portion 11 is switched between the normal mode and the special mode by taking the electrophotographic copying apparatus as an example, the display mode is not limited to the normal mode and the special mode. For example, the display mode may be other modes. Furthermore, the present invention is applicable to a facsimile other than the electrophotographic copying apparatus.

Claims: A display device provided in an image forming apparatus for displaying predetermined data, comprising a single display means (11) capable of selectively displaying a first mode and a plurality of second, special modes and normally displaying the first mode, the display means (11) displaying as said first mode the contents necessarily required for an image forming operation; a second, special mode being selected by operation of any of a plurality of special mode selecting keys (21, 22, 23 ,24, 25, 26, 27, 28, 29, 30, 31), wherein, when a special mode is selected by operation of one of said special mode selecting keys (21-31), the display means (11) displays only the contents of the selected special mode corresponding to that key (21-31); a special mode setting means (32) actuation of which, while said display means (11) displays the contents of a selected special mode, inputs as the contents of operation the contents corresponding to that selected special mode; and automatic display switching means (41) which is responsive to the actuation of the special mode setting means (32) to automatically switch the display of the display means (11) from the selected one of the special modes to said first mode, in which the contents necessarily required for an image forming operation are displayed. A display device as claimed in claim 1, wherein when the contents of the selected special mode are inputted by operation of the special mode setting means (32), the inputted contents are displayed on the display means (11) as the contents of operation for a predetermined time period, at the end of which the display means (11) is switched by the automatic display switching means (41) to the first mode, to display the contents necessarily required for an image forming operation.

Inventors: WAKIKAIDO TAKAHIRO, YOSHIZUKA KEN, WAKIKAIDO, TAKAHIRO, YOSHIZUKA, KEN
Applicants: MITA INDUSTRIAL CO LTD, MITA INDUSTRIAL CO., LTD.
Application year: 1989
Main classification: G03G15
IPC codes: G03G21, G03G15, H04N1