hereinafter , an embodiment of the invention will be described with reference to the accompanying drawings . [ 0045 ] fig1 schematically shows the configuration of an electronic endoscope system 1 according to an embodiment of the invention . the electronic endoscope system 1 includes an electronic endoscope 100 , and a processor 200 for processing signals from the electronic endoscope 100 . the electronic endoscope 100 includes an flexible inserting tube 110 to be inserted into a human body and an operation portion 120 connected to the proximal end of the inserting tube 110 . the electronic endoscope 100 further includes a connector 130 which is detachably connected to the processor 200 . a solid state imaging device such as a ccd 104 and an objective optical system 101 for forming an optical image on a light receiving surface of the ccd 104 are provided to the distal end portion of the inserting tube 110 . further , one or more operation buttons 107 are provided to the operation portion 120 for controlling the operation of the processor 200 . further , a memory such as an eeprom 102 is provided to the electronic endoscope 100 for storing data related to the endoscope 100 , in particular , data intrinsic to each endoscope . in the present embodiment , the eeprom 102 is located in the connector 130 . the processor 200 includes a cpu 201 which is connected to the operation buttons 107 and the eeprom 102 via an signal cable 108 of the endoscope 100 . the cpu 201 controls the operation of the processor 200 in accordance with the signals from the operation buttons 107 . the cpu 201 also accesses to the eeprom 102 to retrieve data stored therein . the cpu 201 is further connected to an input unit , such as a keyboard 400 , via an interface 212 , to control the operation of the processor 200 in accordance with the commands inputted through the keyboard 400 . an operation panel 207 is provided to the processor 200 . a plurality of operation buttons ( not shown ) are arranged on the operation panel 207 at the portion exposed to outside of the case of the processor 200 . such that an operator of the endoscope system 1 can press each button . each button outputs a signal to the cpu 201 , as being pressed , to control the operation of the processor 200 . the processor includes a light source 203 optically connected to the end of a light guide 103 that is arranged throughout the electronic endoscope 100 from the connector 130 to the tip end of the inserting tube 110 . the light emitted from the light source 203 is transmitted through the light guide 103 to illuminate the area in front of the tip end of the inserting tube 110 . an diaphragm 210 is provided on the light path of the light emitted from the light source 203 to restrict the amount of light introduced into the light guide 103 . an diaphragm controller 211 controls the opening size of the diaphragm 210 , or the amount of light introduced into the light guide 103 , in accordance with signals from the cpu 201 . the operator can freely control the opening size of the diaphragm 210 by operating the keyboard 400 or the operation panel 207 . first and second signal processors 204 and 205 are provided to the processor 200 to display images captured by the ccd 104 on a monitor 300 . the first signal processor 204 receives the signal from the ccd 104 via a ccd signal cable 109 and transforms it into rgb digital image data represented in 256 levels of gray scale . the first signal processor 204 outputs the digital image data to the second signal processor 205 which generates video signal , such as ntsc , from the digital image data . the second signal processor 205 also adjusts the white balance of the video signal based on calibration data wr ( r ) and wr ( b ) received from the cpu 201 as will be described later . the second signal processor 205 outputs the video signal to the monitor 300 so that the monitor 300 displays the image captured by the ccd 104 . note that the output device to which the second signal processor 205 may be connected is not limited to the monitor 300 , however , the second signal processor 205 may also be connected to other kinds of output devices such as video printer , for example . a crt controller 206 is provided to the processor to superimpose text information on the image displayed on the monitor 300 . the crt controller 206 generates video signals representing the text information , the patient information and so on , requested by the cpu 201 and output the video signals to the monitor 300 in synchronization with the video signal from the second signal processor 205 . in this way , the processor 200 superimposes arbitrary text information obtained from the cpu 201 on the image captured by the ccd 104 . the text information may include information obtained from the eeprom 102 . the processor 200 is also provided with a real time clock ( rtc ) 209 and a memory 208 . the rtc 209 provides information on current date & amp ; time to the cpu 201 . the memory 208 is adapted to include one or more databases of data related to endoscopes , as will be described later . [ 0060 ] fig2 shows an exemplary format of the data in the eeprom 102 , and fig3 shows an example of the content of the data stored in the eeprom 102 . in the present embodiment , the storage capacity of the eeprom 102 is 16 bytes . the following information are stored in the eeprom 102 in the following order . 1 ) “ serial no .” ( three bytes ): the serial number of the electronic endoscope 100 which is unique for each endoscope . the “ serial no .” may be set to one of values from 1 through 16777215 ( 0 × 1 through 0 × ffffff hexadecimal digit ). 2 ) “ scope name ” ( six bytes ): six alphanumeric characters representing the type of the electronic endoscope 100 . 3 ) “ wb ( r )” ( one byte ) a calibration value of the red color brightness for adjusting white balance of the image captured by the ccd 104 . 4 ) “ wb ( b )” ( one byte ): a calibration value of the blue color brightness for adjusting white balance of the image captured by the ccd 104 . both “ wb ( r )” and “ wb ( b )” can take a value between − 128 and 127 . as shown in fig3 “ wb ( r )” and “ wb ( b )” are respectively set to − 4 and 10 ( 0 × 7c and 0 × 8a in hexadecimal digit ) in the present embodiment . this indicates that the brightness of red color should be decreased by four levels in gray scale , while the brightness of blue should be increased by ten levels . 5 ) “ ownership ” ( one byte ): a variable representing whether the endoscope is purchased or leased . “ ownership ”= 0 , 1 and 2 ( 0 × 0 , 0 × 1 , and 0 × 2 in hexadecimal digit ) respectively represents the endoscope is purchased , leased for a long term ( a term not less than 30 days , for example ), and leased for a short term ( term less than 30 days , for example ). 6 ) “ spec ” ( one byte ): a variable representing the specification of the electronic endoscope 100 . if the electronic endoscope 100 is a standard type , then “ speck ” is set to 0 . if the electronic endoscope is a custom made endoscope , then “ spec ” is set to a value corresponding to the particular specification . in the present embodiment , “ spec ” is set to 1 which indicates the optical system 101 includes a lens applied with special coatings . 7 ) “ expiration ” ( three bytes ): the expiration date of the lease of the electronic endoscope 100 . the first one byte of “ expiration ” indicates the year , the next one the month , and the last one the day . in the example shown in fig3 value 040331 is assigned to “ expiration ” which indicates the expiration of the lease is mar . 31 , 2004 . if the electronic endoscope 100 is a purchased one , then 000000 is assigned to “ expiration ”. among the items recited above , the “ serial no .”, “ scope name ”, “ ownership ”, and “ expiration ” are examples of information for managing endoscopes , while “ wb ( r )”, “ wb ( b )”, and “ spec ” are examples of information representing the characteristics of endoscopes . the data of eeprom 102 are copied to the memory 208 of the processor 200 as the electronic endoscope 100 is connected to the processor 200 for the first time to register the endoscope to one of the database . [ 0071 ] fig4 shows an exemplary structure of the database established in the memory 208 of the processor 200 . the memory 208 - is operated by the cpu 201 such that it includes at least two data aggregates each of which being defined to correspond to a specific condition of the endoscopes . in the present embodiment , two data files of csv format , for example , are established in the memory 208 as two data aggregates . one of the data file , “ file - 0 ”, is defined to register data related to purchased endoscopes , or endoscopes of which “ ownership ” is set to 0 , while the other data file , “ file - 1 ”, is defined to register data related to leased endoscope , or endoscopes of which “ ownership ” is set to 1 or 2 . it should be noted , however , that the memory 208 may also include three data files , and utilize the first one for registering data related to purchased endoscopes , the second one for registering data related to endoscopes leased for long term (“ ownership ”= 1 ), and the third one for registering data related to endoscopes leased for short term (“ ownership ”= 2 ). each data file includes 39 records and each record is defined for storing data related to one specific endoscope . thus , data of 39 endoscopes can be stored in each of the data files . “ register no .” is utilized for identifying the record . in the present embodiment , a serial number from 1 to 39 is assigned to the records . “ scope name ”, “ serial no .”, “ wb ( r )” and “ wb ( b )”, “ ownership ”, “ spec ”, and “ expiration ”, are items same as that in the eeprom 102 . “ registered date & amp ; time ” is the date and time when the electronic endoscope 100 is connected to the processor 200 for the first time . “ registered date & amp ; time ” includes six figures date information and four figures time information . if “ registered date ” is set to “ 001015 . 1424 ”, for example , then it represents oct . 15 , 2000 , 2 : 24 p . m . “ used date & amp ; time ” is the date and time when the electronic endoscope 100 was connected to the processor 200 , or used , for the last time . the format of “ used date & amp ; time ” is same as that of “ registered date & amp ; time ” “ count ” is the number of times the electronic endoscope 100 is connected to the processor 200 , or used . this variable may be used as an indication of the frequency in use of the endoscope . [ 0091 ] fig5 is a flow chart showing the main routine related to the operation of the processor 200 according to first embodiment of the invention . at first , the cpu 201 of the processor 200 initializes a variable “ current_scope ” to 0 ( s 100 ). the variable “ current 13 scope ” is for storing the “ register no .” of the record in which the data of the endoscope currently connected to the processor 200 are stored . if 0 is assigned to “ current_scope ”, it represents that no endoscope is currently connected to the processor 200 . after the initialization of “ current_scope ”, the cpu 201 waits until the electronic endoscope 100 is connected to the processor 200 if there isn &# 39 ; t any ( s 102 ). if the electronic endoscope 100 is connected to the processor 200 ( s 102 : yes ), the cpu 201 accesses to the eeprom 102 of the electronic endoscope 100 and obtains the data stored therein ( s 104 ). next , the first and second signal processors transform the output signal from the ccd 104 into video signal to display the image captured by the ccd ( s 106 ). then , the cpu 201 displays the “ scope name ” of the currently connected electronic endoscope 100 on the monitor 300 ( s 108 ). further , the cpu 201 opens one of the data files in the memory 208 ( s 11 o ), and then stores the data obtained from the eeprom 102 therein ( s 112 ). next , the white balance of the image captured by the ccd 104 of the electronic endoscope 100 is adjusted using the calibration value (“ wb ( r )”, “ wb ( b )”) obtained form the eeprom 102 ( s 114 ). that is , the cpu 201 sends the calibration value of “ wb ( r )” and “ wb ( b )” to the second signal processor 205 so that the second signal processor 205 adjusts the color balance of the image signals generated there . after s 114 , the processor watches whether the endoscope 100 is still connected , and as long as the electronic endoscope 100 is still connected to the processor 200 ( s 116 : yes ), the processor 200 displays the current date and time on the monitor 300 ( s 118 ), and also performs various kinds of adjustments in accordance with manual operation by the operator ( s 120 ). if the electronic endoscope 100 is disconnected from the processor 200 , the cpu 201 closes the file opened in s 110 ( s 122 ). after s 122 , the operation of the processor 200 goes back to s 100 . [ 0099 ] fig6 is a flow chart showing a subroutine display scope name called in s 108 of the main routine shown in fig5 . in scope name displaying routine , the cpu 201 first decides whether the currently connected endoscope is a purchased one or a leased one . this is done by checking the value of “ ownership ” obtained from the eeprom 102 ( s 152 ). if “ ownership ” indicates the endoscope is purchased , i . e ., “ ownership ”= 0 , then cpu 201 sends the alphanumeric characters of the “ scope name ” obtained from the eeprom 102 to the crt controller 206 to superimpose the type of the electronic endoscope 100 on the image captured by the ccd 102 and displayed on the monitor 205 ( s 154 ). if “ ownership ” indicates the endoscope is leased , i . e ., “ ownership ”= 1 or 2 , then the cpu 201 sends the characters indicated by “ scope name ” together with characters “ leased ” to the crt controller to superimpose those characters on the image displayed on the monitor 300 ( s 156 ). after the execution of s 154 or s 156 , the operation of the processor 200 returns to the main flow shown in fig5 . [ 0103 ] fig7 is a flow chart showing a subroutine file open called in s 110 of the main routine shown in fig5 . in this routine , the cpu 201 selects the data file , or database , for storing the data of the electronic endoscope 100 in accordance with the ownership of the electronic endoscope 100 . that is , the cpu 201 checks the state of “ ownership ” obtained from the eeprom 102 ( s 172 ). if “ ownership ” is 0 , indicating the endoscope is purchased , then the cpu 201 select the data file “ file - 0 ” by substituting the file name into a character string “ file name ” ( s 174 ). if “ ownership ” is 1 or 2 , indicating the endoscope is leased , then the cpu 201 selects the data file “ file - 1 ” ( s 176 ). after the selection of the data file , the cpu 201 accesses the memory 208 and opens the data file specified by “ file name ”. it should be noted that the data file to be opened may also be determined based on information of “ scope name ”, “ spec ” and / or “ expirations ” of the endoscopes . further , the data file to be opened may be determined based on information manually inputted through input units such as the keyboard 400 , instead of the data obtained from the eeprom 102 . [ 0106 ] fig8 is a flow chart showing a subroutine endoscope registration called in s 112 of the main routine of fig5 . in this routine , the cpu 201 decides whether or not the data related to the currently connected endoscope is already registered with the memory 208 ( s 202 ). this is achieved by searching within the data file opened in s 110 for a record including data that matches the “ scope name ” and “ serial no .” obtained from the eeprom 102 . if there is a record including the above mentioned data ( s 202 : yes ), it means the data of the electronic endoscope 100 currently connected is already registered with the memory 208 . in this case , the “ register no .” of the record found is set to “ current_scope ” ( s 204 ) and the operation of the processor 200 proceeds to s 220 which will be described latter . if a record including the above mentioned data is not found , it means the electronic endoscope 100 is not yet registered ( s 202 : no ). in this case , the cpu 201 checks whether there is still any available memory space , or open records , in which the data except for the “ register no .” are empty , within the data file to register the data obtain from the eeprom 102 ( s 206 ). in the case where there is still an open record ( s 206 : yes ), the “ register no .” of the open record is set to “ current scope ” ( s 208 ). if there are more than one open records , the smallest “ register no .” is preferably selected and set to the “ current scope ”. after execution of s 208 , the operation of the processor 200 proceeds to s 216 which will be described later . in the case where no open record is found ( s 206 : no ), then the “ register no .” of the record including the oldest “ registered date & amp ; time ” is specified ( s 210 ), and the data of the record identified by the specified “ register no .” is deleted , except for the “ register no ”, to free up the record ( s 212 ). further , the specified “ register no .” is set to “ current_scope ” ( s 214 ). after the execution of s 208 or s 214 , the cpu 201 stores the data obtained from eeprom 102 , or the data of currently connected electronic endoscope 100 , into the record identified by the register number in “ current_scope ” ( s 216 ). specifically , the cpu 201 stores “ serial no .”, “ scope name ”, “ wb ( r )”, “ wb ( b )”, “ ownership ”, “ spec ”, and “ expiration ” obtained from the eeprom 102 into the record . in this manner , the data of the new endoscope is automatically registered with the database . next , the cpu 201 obtains the current date and time information from the rtc 209 and stores it in “ registered date & amp ; time ” of the record specified by “ register no .” ( s 218 ). this is to make a record of the date and time of registration of the new electronic endoscope 100 , after the execution of s 218 or s 204 , “ used date & amp ; time ” and “ count ” of the record specified by “ current scope ” are updated . that is , the current time information obtained from the rtc 209 is overwritten to “ used date & amp ; time ” ( s 220 ), and “ count ” is incremented by one ( s 222 ). after s 222 , the operation of the processor 200 returns to the main flow shown in fig5 . [ 0116 ] fig9 is a flow chart showing a subroutine display date & amp ; time in s 118 of the main routine shown in fig5 . in this routine , the cpu 201 checks whether or not the date and time information of a variable “ date & amp ; time ” indicates the exact time by comparing “ date & amp ; time ” with the date and time information from the rtc 209 ( s 242 ). if the difference between the two pieces of the date and time information is less than a second , then the cpu 201 decides the two pieces of the date and time information are same ( s 242 : yes ). in this case , the operation of the processor 200 immediately returns to the main flow of in fig5 without updating the “ date & amp ; time ”. if the difference between the two date and time information is not less that one second ( s 242 : no ), then the date and time information from the rtc 209 , or the current date and time , is set to “ date & amp ; time ” ( s 244 ). then , the cpu 201 generates text information indicating the date and time stored in “ date & amp ; time ” such as “ may 21 , 2002 , 15 : 20 : 31 ”, for example , and sends it to the crt controller 206 to superimpose the current date and time on the image displayed by the monitor 300 ( s 246 ). in this manner , time information displayed is updated every second . after the execution of s 246 , the operation of the processor 200 returns to the main flow shown in fig5 . [ 0121 ] fig1 is a flow chart showing a subroutine adjustment in s 120 of the main routine shown in fig5 . this routine is for allowing the operator to manually adjust the white balance of the image captured by the ccd 104 , and the opening size of the diaphragm 210 . in this routine , the cpu 201 decides whether or not the adjustment of white balance is requested by checking the signals from the keyboard 400 , the operation panel 207 , and the operation buttons 107 ( s 262 ). if there is a request ( s 262 : yes ), then the cpu 201 rewrites the value of the “ wb ( r )”, “ wb ( b )” in the record specified by “ current scope ” in accordance with the signal from the keyboard 400 , the operation panel 207 , or the operation buttons 107 ( s 264 ). further , the cpu 201 sends the value of latest “ wb ( r )” and “ wb ( b )” to the second signal processor 205 so that the second signal processor 205 re - adjusts the white balance of the image generated there ( s 266 ). after the execution of s 266 or in the case there isn &# 39 ; t any request for white balance adjustment ( s 262 : no ), the cpu 201 checks again the output signals from the keyboard 400 , the operation panel 207 , and the operation buttons 107 to decide whether or not the adjustment of diaphragm is requested ( s 268 ). if there is a request ( s 268 : yes ), then the cpu 201 opens / closes the diaphragm 210 , via the diaphragm controller 211 , in accordance with the request from the keyboard 400 , the operation panel 207 , or the operation buttons 107 to control the amount of light introduced into the light guide 103 ( s 270 ). if there isn &# 39 ; t any request ( s 268 : no ), the operation of the processor returns to the main flow of fig5 . it should be noted that the operation of processor 200 described in fig5 through fig1 may be modified in many ways within the scope of the invention . for example , s 210 in the subroutine endoscope registration shown in fig8 may be replaced with a step that specifies the “ register no .” of the record including the oldest “ used date & amp ; time ” as shown in fig1 ( see s 210 *). if s 210 is replaced with s 210 *, the data related to the endoscope not used recently , and may have the lowest possibility to be used again in the future , is deleted to free up memory space for registering data of the new endoscope . further , s 212 in fig8 may also be canceled if data is overwritten in s 214 through s 216 . the manner of managing the data in the memory 208 may also be modified in many ways . for example , a plurality of areas may be defined within one data file of the memory 208 , and data of the electronic endoscope 100 may be registered in the area corresponding to the feature of the electronic endoscope 100 indicated by “ ownership ”, “ spec ”, and / or “ expiration ”, or any data inputted manually into the keyboard 400 . [ 0129 ] fig1 schematically shows an address map of the memory 208 in which two data areas are defined in one data file as second embodiment of the invention . as shown in fig1 , the memory 208 includes a data file 216 , and first and second data areas 220 a and 220 b are defined within the data file 216 . the first data area 220 a extends from address 0 to 1499 ( in decimal system ), and the second data area 220 b from address 1500 to 2999 ( in decimal system ). each of first and second data areas 220 a and 220 b includes 39 records having same format as that shown in fig4 . the first and second data areas 220 a and 220 b are for registering data related to purchased endoscopes and leased endoscopes , respectively . if the memory 208 is managed as shown in fig1 , s 110 and s 112 of fig5 should be modified as shown in fig1 and 14 . that is , in the subroutine file open ( s 110 ), the cpu 201 opens the data file 216 ( s 302 ). next , the cpu 201 checks the state of “ ownership ” obtained from eeprom 102 ( s 304 ). if “ ownership ” is 0 ( s 304 : yes ), indicating the endoscope is purchased , then the cpu 201 sets a variable “ offset ” to 0 ( s 306 ). “ offset ” is used later as an address start to reading the memory 208 . if “ ownership ” is 1 or 2 , indicating the endoscope is leased , then the cpu 201 sets “ offset ” to 1500 . after the execution of s 306 or s 308 , the operation of the processor 200 returns to the main flow shown in fig5 to execute the subroutine endoscope registration ( s 112 ). in the subroutine endoscope registration ( s 112 ) shown in fig1 , s 202 , s 206 , s 208 , and s 210 are replaced with s 202 *, s 206 *, s 208 *, and s 210 *, respectively . other steps are same as that in fig8 . the contents of s 202 *, 206 *, s 208 *, and s 220 * are same as that of the replaced steps except that the memory area that the cpu 201 can treat is limited to the address “ offset ” through “ offset ”+ 1499 . that is , if “ offset ” is set to 0 in the subroutine file open ( s 110 ), then the cpu 201 can read , write , and delete data only within the first data area 220 a of the memory 208 , and if “ offset ” is 1500 , then the cpu 201 can handle the data only in the second data area 220 b . accordingly , if a new leased endoscope , for example , is connected to the processor 200 , the cpu 201 never accesses to the first data area 220 a , and thus never deletes data of purchased endoscopes , which may be more important than data of leased endoscopes , in order to register leased endoscopes &# 39 ; data . the present disclosure relates to the subject matters contained in japanese patent application no . p2001 - 200209 , filed on jun . 29 , 2001 , and japanese patent application no . p2001 - 323463 , filed on oct . 22 , 2001 , which are expressly incorporated herein by reference in their entireties .
an endoscope system is provided that includes a processor connectable to various endoscopes to process signals generated by the endoscope being connected . the processor further includes a database , a data selector and a data register . the database is configured to be registered a plurality of pieces of endoscope data , each of which being related to different one of the endoscopes connectable to the connector . each piece of the endoscope data includes priority information indicating the priority of deleting the piece of endoscope data . the data selector selects one piece of the endoscope data based on the priority information . the data register registers a new endoscope with the database by replacing the selected piece of endoscope data with the piece of endoscope data of the new endoscope .