Claims
- 1. In an original exposing device operable in an automatic exposure mode in which exposing degree is varied automatically in accordance with the density of an original and in a manual mode in which exposing degree is varied manually within a predetermined variable range in accordance with manual adjusting operation, the method comprising the steps of:
- obtaining the average exposing degree in an automatic exposure mode; and
- shifting the predetermined variable range of manual exposure mode so as to cause said average exposing degree of automatic exposure mode to become a median in the shifted variable range.
- 2. In an image forming apparatus operable in an automatic mode in which power supplied to an image forming means is varied automatically in accordance with the density of an original and in a manual mode in which power supplied to the image forming means is varied manually within a predetermined variable range in accordance with manual adjusting operation, the method comprising the steps of:
- obtaining the average power degree in an automatic mode; and
- shifting the predetermined variable range of manual mode so as to cause said average degree of automatic mode to become a median in the shifted variable range.
- 3. An original exposing device comprising:
- exposing means for exposing an original in various degrees;
- detecting means for detecting original density;
- automatic exposure means for adjusting exposure automatically in accordance with the original density through increase and decrease of exposing degree;
- manual exposure means for adjusting exposure manually through increase and decrease of exposing degree within a predetermined variable range;
- selecting means for selecting either manual mode in which the manual exposure means is active or automatic mode in which the automatic exposure means is active; and
- range shift means for shifting said variable range of the exposing degree so as to cause the exposing degree determined by automatic exposure means to become the median in the shifted variable range.
- 4. The original exposing device of claim 3 wherein said range shift means shifts said variable range when the mode is switched from automatic to manual.
- 5. The original exposing device of claim 3, further comprising:
- displaying means for displaying exposure information which includes at least a first indicator element corresponding to minimum exposure degree, a second indicator element corresponding to median exposure degree and a third indicator element corresponding to maximum exposure degree and indicates the degree of exposure through selective operation of said indicator elements when in manual mode; and
- means for controlling said display means so that said second indicator element is operated when the mode is switched from automatic to manual.
- 6. The original exposing device of claim 3 further comprising:
- operation means for obtaining the average of the exposing degree in automatic mode;
- wherein said range shift means shifts said variable range of the exposing degree so as to cause said average of the exposing degree to become the median in the shifted variable range when the mode is switched from automatic to manual.
- 7. The original exposing device of claim 6 wherein said operation means samples more than one set of data related to the exposing degree in automatic mode and obtains the average of the exposing degree based on the sampled data.
- 8. The original exposing device of claim 7 wherein said operation means fixes a predetermined value as the average of the exposing degree irrespective of the sampled data when the number of the sampled data are less than desired.
- 9. The original exposing device of claim 8 wherein said operation means varies the desired number of data to be sampled in accordance with the size of the originals.
- 10. The original exposing device of claim 3 further comprising:
- a document table which support an original to be exposed;
- second detecting means for detecting the exchange of the original on the document table; and
- second control means for setting a predetermined value as the exposing degree in manual mode in response to the exchange of the original.
- 11. The original exposing device of claim 10 further comprising:
- a document cover which is movable between a closed position where the document cover covers the document table and an opened position where the document cover uncovers the document table;
- wherein said second detecting means detects the exchange of the original on the document table when said document cover is moved from the closed position to the opened position.
- 12. An original exposing device comprising:
- exposing means for exposing an original in various degrees;
- detecting means for detecting original density;
- automatic exposure means for adjusting exposure automatically in accordance with the original density through increase and decrease of exposing degree;
- manual exposure means including manual operable member for selecting one of predetermined exposing degrees in accordance with the operation of the manual operable member through increase and decrease of exposing degree within a predetermined variable range;
- selecting means for selecting either manual mode in which the manual exposure means is active or automatic mode in which the automatic exposure means is active; and
- display means for displaying exposure degree in manual exposure mode, said display means including a plurality of display elements one of which corresponds to minimum exposing degree, another one of which corresponds to median exposing degree and still another one of which corresponds to maximum exposing degree in the predetermined variable range;
- display controlling means for operating one of said display elements corresponding to the degree selected by said manual exposure means; and
- range shift means for shifting said variable range of the exposing degree so as to cause the exposing degree determined by automatic exposure means to become the median in the shifted variable range and displaying said display element corresponding to the median degree.
- 13. An image forming apparatus comprising:
- image forming means for forming an image of an original on the surface of a recording medium;
- supplying means for supplying power to the image forming means in variable degrees;
- detecting means for detecting original density;
- first controlling means which automatically selects one of the power degrees according to original density;
- second controlling means which manually selects one of power degrees within a predetermined variable range;
- selecting means for selecting either first mode in which the first controlling means is active or second mode in which the second controlling means is active;
- storage means for storing the power degree selected by said first controlling means in the first mode; and
- range shift means for shifting said variable range of the power degree so as to cause the power degree stored by said storage means to become the median in the shifted variable range.
- 14. The image forming apparatus of claim 13 further comprising:
- signal generating means for generating an initialization signal; and
- third controlling means for shifting said variable range in response to the initialization signal so that the median value of the shifted range would be a predetermined value, when in the second mode.
- 15. The image forming apparatus of claim 14 further comprising:
- a document table; second detecting means for detecting the exchange of the original on the document table;
- wherein said signal generating means generates the initialization signal in response to the second detecting means.
- 16. The image forming apparatus of claim 15 wherein said second detecting means comprises:
- a cover which covers and uncovers the document table; and
- a switch which detects the opening and the closing of the cover to detect the exchange through the switch.
- 17. The image forming apparatus of claim 14 further comprising:
- input means for inputting an interruption command;
- wherein said signal generating means generates the initialization signal in response to the input of the interruption command.
- 18. The image forming apparatus of claim 17 further comprising:
- second input means for inputting an interruption cancel command;
- wherein third controlling means for shifting said variable range in response to the interruption cancel command so that the median value of the shifted range would be a predetermined value.
Priority Claims (5)
Number |
Date |
Country |
Kind |
62-75179 |
Mar 1987 |
JPX |
|
62-75180 |
Mar 1987 |
JPX |
|
62-75181 |
Mar 1987 |
JPX |
|
62-75182 |
Mar 1987 |
JPX |
|
62-75183 |
Mar 1987 |
JPX |
|
Parent Case Info
This application is a continuation of application Ser. No. 07/173,452, filed Mar. 25, 1988, now abandoned.
US Referenced Citations (13)
Foreign Referenced Citations (1)
Number |
Date |
Country |
59-198471 |
Nov 1984 |
JPX |
Continuations (1)
|
Number |
Date |
Country |
Parent |
173452 |
Mar 1988 |
|