公开(公告)号：JPH0799564A

公开(公告)日：1995-04-11

申请号：JP24184393

申请日：1993-09-28

Applicant: MINOLTA CO LTD ,  SHARP KK

Inventor： TAKASU AKIRA ,  EGUCHI TATSUYA ,  KAWANISHI SHINYA ,  OKADA KEIICHI ,  FURUTA KOICHI

IPC: G01B11/02 ,  G03B27/62 ,  H04N1/04

Abstract: PURPOSE:To easily add and revise an original size to be detected with respect to an original size detection mechanism in a copying machine or the like. CONSTITUTION:A CPU 1 for exclusively detecting an original size is provided in addition to a main body control CPU 2. The CPU 1 discriminates an original size based on the output data OUTF1-3, OUTC1-2. Then the CPU 1 converts the discriminated original size into original size codes DATA0-3 and transfer them to the main body control CPU 2. Then the distance between each light emitting element and each photoreceptor element is set equal to decrease the difference of a detected distance.

公开(公告)号：JPH0799563A

公开(公告)日：1995-04-11

申请号：JP24184293

申请日：1993-09-28

Applicant: MINOLTA CO LTD ,  SHARP KK

Inventor： TAKASU AKIRA ,  EGUCHI TATSUYA ,  KAWANISHI SHINYA ,  OKADA KEIICHI ,  FURUTA KOICHI

IPC: H04N1/04

Abstract: PURPOSE:To easily add and revise an original size to be detected with respect to an original size detection device in a copying machine or the like. CONSTITUTION:A CPU1 for exclusively detecting an original size is provided in the reader. Distance sensors FD1-3, CD1-2 including position detecting elements are used for the original size detecting sensors. The CPU1 discriminates an original size based on the output data OUTF1-3, OUTCD1-2. Then the CPU1 converts the discriminated original size into original size codes DATA0-3 and transfers them to the main body control CPU2. Then a main body control program is not required to be revised attended with revision of the detecting size and the addition of the detecting sensors.

公开(公告)号：JPH0479506A

公开(公告)日：1992-03-12

申请号：JP19231290

申请日：1990-07-19

Applicant: SHARP KK

Inventor： FURUTA KOICHI

IPC: H03F1/02 ,  H03F3/45

Abstract: PURPOSE:To attain low power consumption by devising the circuit such that a drive current fed to an output transistor(TR) is changed dynamically in response to the degree as to whether a load is heavy or thereby eliminating a waste use of a power current even at a light load. CONSTITUTION:The circuit is provided with a drive current supply circuit B, which detects a difference between an output voltage of an input TR circuit A and an output voltage of an output TR circuit C and supplies a drive current in response to the result of detection to the output TR being a major component of the output TR circuit C. Thus, when the load is heavier, a difference between the output voltage of the input TR circuit A and the output voltage of the output TR circuit C gets larger and the drive current fed to the output TR is changed in response to the difference of the output voltage. Thus, the buffer circuit with small power consumption is realized.

公开(公告)号：JPH037410A

公开(公告)日：1991-01-14

申请号：JP14254289

申请日：1989-06-05

Applicant: SHARP KK

Inventor： FURUTA KOICHI

IPC: H03G3/12

Abstract: PURPOSE:To simplify the process by providing a differential amplifier applying current conversion to a difference between an input voltage and a reference voltage given to an operational amplifier and supplying the current obtained by this conversion to the input of the operational amplifier and a control means controlling the operation/inoperation of the differential amplifier. CONSTITUTION:When a control means inactivates a differential amplifier 6, since no current flows to an input of an operational amplifier 2 from the differential amplifier 6, the gain is kept to a 1st value. When the control means activates the differential amplifier 6 on the other hand, since a current based on the difference between an input voltage and a reference voltage flows to the input of the operational amplifier 2, the the gain is kept to a 2nd value which is different from the 1st value. When a high level voltage is given as a switching voltage Vs, since a transistor(TR) Q12 is turned on, a 3rd current mirror circuit 11 is turned off, resulting that a 2nd current mirror circuit 10 is turned off. This means that TRs Q7, Q8 are turned off, resulting in inactivating the differential amplifier 6. Thus, the process is simplified.

公开(公告)号：JPH01188010A

公开(公告)日：1989-07-27

申请号：JP1142888

申请日：1988-01-21

Applicant: SHARP KK

Inventor： FURUTA KOICHI

IPC: H03F3/45

Abstract: PURPOSE:To prevent a collector current of a transistor(TR) from being in excess of a current in the balanced state by connecting a constant current source to emitters connected in common and providing a current compensation circuit making a maximum value of each collector output current of a couple of TRs equal to a half of the current value flowing to the constant current source. CONSTITUTION:Emitter of a couple of TRs Q11, Q12 with equal characteristic are connected in common to the constant current source 12 in a differential amplifier circuit 11 and each base of the TRs Q11, Q12 is connected respectively to input terminals 13, 14 and an input voltage Vi is applied between the input terminals 13 and 14. A compensation current ic corresponding to the change in the input voltage Vi is generated by a compensation circuit 15 and the compensation current ic is fed to the common emitter of the TRs Q11, Q12 via a line l1. Thus, the maximum value of output currents IC11, IC12 of the TRs Q11, Q12 is limited below the current I0 in the balanced state.

公开(公告)号：JPH06208175A

公开(公告)日：1994-07-26

申请号：JP316093

申请日：1993-01-12

Applicant: SHARP KK

Inventor： FURUTA KOICHI ,  KAWANISHI SHINYA ,  OKADA KEIICHI

IPC: G03B27/62 ,  G03G15/04 ,  H04N1/00 ,  H04N1/04

Abstract: PURPOSE:To provide the optimum threshold levels for individual sensors at the time of the presence and absence of the document. CONSTITUTION:A semiconductor position detecting element (PSD) is used for a light receiving element 33, and sensor output data at the time of the presence and absence of the document are stored in a memory section 62 as reference values Dtp1-Dtp3, Dtn1-Dtn3 in advance. The reference values Dtp1-Dtp3, Dtn1-Dtn3 are stored as separate values for size detecting sensors 15a-15c. The measured sensor output data Vo are compared with the reference values Dtp1-Dtp3, Dtn1-Dtn3 respectively for the size detecting sensors 15a-15c, and the presence or absence of the document is judged.

公开(公告)号：JPH06194752A

公开(公告)日：1994-07-15

申请号：JP13171693

申请日：1993-06-02

Applicant: SHARP KK

Inventor： KAWANISHI SHINYA ,  OKADA KEIICHI ,  FURUTA KOICHI

IPC: G03B27/62 ,  G03G15/04

Abstract: PURPOSE:To automatically correct the dispersion in characteristic of individual sensors. CONSTITUTION:The measurement result VO of each size detecting sensor 15 is stored in a memory part 62 as a document present time data Dt1, and when a document 11 is placed on a document placing base 12, and an upper lid 58 is closed, then, the measurement result VO of the size detecting sensor 15 at that time is relatively compared and judged with the manuscript present time data Dt1, whereby the necessity of considering the characteristic dispersion of a light emitting element 32 and a light receiving element 33 is eliminated.

公开(公告)号：JPH0618258A

公开(公告)日：1994-01-25

申请号：JP6575492

申请日：1992-03-24

Applicant: SHARP KK

Inventor： KAWANISHI SHINYA ,  OKADA KEIICHI ,  FURUTA KOICHI

IPC: G01B11/00 ,  G01C3/06 ,  G01S17/08

Abstract: PURPOSE:To obtain a highly accurate range finding output over a wide finding range by individually providing light receiving sections for measuring long and short distances, respectively, comparing outputs from two detecting circuits, and making an automatic switching based on the comparison results. CONSTITUTION:Semiconductor position detecting elements(PSD) 5a, 5b are provided, respectively, with light receiving amount detecting circuits 21a, 21b for individually detecting photocurrents flowing through the PSD 5a, 5b. The detecting circuit 21 is constituted to obtain long distance information as compared with the detecting circuit 21b. A read-in control circuit 31 comprises means 32 for comparing output results from the detecting circuit 21b with a predetermined reference output range and delivering decision result to a switching means 33. When the comparing means 32 makes a decision that the output signal from the detecting circuit 21b deviates from the predetermined reference output range, the switching means 33 determines the distance of an object to be detected based on the output signal and makes automatic switching to the detecting circuit 21a thus reading the detection results again.

公开(公告)号：JPH1168658A

公开(公告)日：1999-03-09

申请号：JP22540797

申请日：1997-08-21

Applicant: SHARP KK

Inventor： YOKOGAWA SEIICHI ,  FURUTA KOICHI ,  OKUDA TAKANORI

IPC: H04B10/11 ,  H04B10/114 ,  H04B10/2507 ,  H04B10/40 ,  H04B10/50 ,  H04B10/54 ,  H04B10/60 ,  H04B10/02 ,  H04B10/18

Abstract: PROBLEM TO BE SOLVED: To provide an optical transmitter-receiver without disturbing communication of other optical transmitter-receiver by reducing harmonic components included in a frequency spectrum of an optical signal emitted from a transmission section. SOLUTION: In the case of using an infrared ray transmitter-receiver 1 as a transmitter, switches SW1, SW2 are turned to the position of terminals (2), (2') respectively to incorporate a band pass filter 5 into a part of a transmission section. A digital transmission signal received from an input terminal A passes through the band pass filter 5 to eliminate harmonics included in the frequency spectrum of a subcarrier. A driver 4 blinks an LED 3 depending on its output signal to allow the LED 3 to emit an infrared ray externally as an optical signal. In the case of using the infrared ray transmitter-receiver 1 or a receiver using a photo diode 6 as a light receiving section, the switches SW1, SW2 are turned to the position of terminals (1), (1') respectively to incorporate the band pass filter 5 into a part of a reception section.

公开(公告)号：JPH0815017A

公开(公告)日：1996-01-19

申请号：JP14937794

申请日：1994-06-30

Applicant: SHARP KK

Inventor： KAWANISHI SHINYA ,  OKADA KEIICHI ,  FURUTA KOICHI

IPC: G01J3/46 ,  G03G15/01 ,  G03G15/08 ,  G03G21/00

Abstract: PURPOSE:To achieve an accurate measurement of the density of a color toner on a photosensitive drum. CONSTITUTION:Three photodetectors 31, 32 and 33 arranged facing image non- formation areas of a photosensitive drum have spectroscopic sensitivities respectively in wavelength areas of red light, green light and blue light. In the measurement of the concn. of cyanide toner adhering to the image non-formation areas of the photosensitive drum, signals are outputted to a first division circuit 41 corresponding to quantities of light of the red light and green light received with the photodetectors 31 and 32 and the ratio of the signals is computed with the first division circuit 41. The results of the computation of the first division circuit 41 are stored into a memory section 43 selectively. The results of the subsequent computation of the first division circuit 41 are compared with those of the first division circuit 41 stored in the memory section 43 by a comparative computation section 44.