Photometric circuit with photo-voltaic element
阅读：761发布：2021-08-26
专利汇可以提供Photometric circuit with photo-voltaic element专利检索，专利查询，专利分析的服务。并且A photometric circuit. An operational amplifier has inversion input, non-inversion input and output terminals. A feedback circuit is coupled between the output and the inversion input terminals. A photo diode provides a photo-voltaic effect between the inversion input and non-inversion input terminals. The feedback circuit is characterized in that the signal across the photo-electric diode is maintained at substantially 0 volts. A diode is coupled to the current from the photo-electric diode for providing an output signal proportional to the logarithm of the current.，下面是Photometric circuit with photo-voltaic element专利的具体信息内容。
1. A photometric circuit comprising: an operational amplifier having inversion and non-inversion signal input terminals and an output terminal; means providing a photo-voltaic effect coupled between the inversion input and non-inversion input terminals; a feedback circuit coupled between the output terminal and the inversion input terminal causing the voltage of the signal across the photo-voltaic means to be maintained at substantially 0; and means serially coupled between an end of the photo-voltaic means which is coupled to the non-inversion input terminal and a reference potential and characterized in that a signal is formed thereacross corresponding to the logarithm of current received from the photo-voltaic means.
2. The photometric circuit of claim 1 wherein said means for providing an output signal proportional to the logarithm compression of current comprises a diode.
3. A photometric circuit according to claim 1 wherein said photo-voltaic means comprises a photo diode.
4. A photometric circuit comprising: an operational amplifier having inversion and non-inversion signal input circuits and an output circuit; photo-voltaic means having first and second terminals coupled, respectively, between the inversion and non-inversion signal input circuits; means for maintaining the interterminal voltage of said photo-voltaic means at substantially 0 volts comprising a feedback circuit coupled between the output circuit of said operational amplifier and the first terminal of said photo-voltaic means; and logarithmic compression means serially coupled between an end of the photo-voltaic means which is coupled to the non-inversion input terminal and a reference potential and responsive to the current provided by said photo-voltaic means for providing an output signal.
5. The photometric circuit of claim 4 wherein said logarithmic compression means comprises a semi-conductor diode coupled between the photo-voltaic means and the reference potential.
6. The photometric circuit of claim 4 wherein said photo-voltaic means comprises a semi-conductor photodiode.
7. The photometric circuit of claim 5 wherein said photo-voltaic means comprises a semi-conductor photodiode, said semi-conductor photodiode and diode being serially connected together and polled to provide opposite PN junctions in the diodes serially passing through the serially connected diodes.
8. The photometric circuit of claim 4 comprising a signal inverting circuit coupled to the output circuit of said operational amplifier in said feedback circuit.
9. The photometric circuit of claim 4 wherein said logarithmic compression means comprises a diode and further comprising a further diode, the photo-voltaic means, diode and further diode being coupled in series circuit relation, the source of reference potential being coupled to the other side of said further diode from said diode; and means providing a current signal to the junction between the diode and further diode corresponding to exposure time.
10. The photometric circuit of claim 9 comprising a source of potential, said means providing a current comprising an adjustable impedance coupled between the source of potential and the diode junction.
11. The photometric circuit of claim 10 wherein said operational amplifier has an input for receiving power coupled across said source of potential.
12. In a camera having a trailing screen, a. a photometric circuit comprising: an operational amplifier having inversion and non-inversion signal input circuits and an output circuit, photo-voltaic means having first and second terminals coupled, respectively, between the inversion and non-inversion signal input circuits, means for maintaining the interterminal voltage of said photo-voltaic means at substantially 0 volts comprising a feedback circuit coupled between the output circuit of said operational amplifier and the first terminal of said photo-voltaic means, and logarithmic compression means serially coupled between the second end of the photo-voltaic means and a reference potential and responsive to the current provided by said photo-voltaic means for providing an output signal, and b. means responsive to said output signal for selectively actuating the trailing screen.
13. In the camera of claim 12 wherein said logarithmic compression means comprises a semi-conductor diode coupled between the photo-voltaic means and the reference potential for receiving the current from the photo-voltaic means.
14. In the camera of claim 12 wherein said photo-voltaic means comprises a semi-conductor photodiode.
15. In the camera of claim 13 wherein said photo-voltaic means comprises a semi-conductor photodiode, said semi-conductor photodiode and diode being serially connected together and polled to provide opposite PN junctions in the diodes serially passing through the serial connected diodes.
16. In the camera of claim 12 comprising a signal inverting circuit coupled to the output circuit of said operational amplifier in said feedback circuit.
17. In the camera of claim 12 wherein said logarithmic compression means comprises a diode and further comprising a further diode, the photo-voltaic means, diode and further diode being coupled in series circuit relation, the source of reference potential being coupled to the other side of said further diode from said diode; and means providing a current signal to the junction between the diode and further diode corresponding to exposure time, the output signal being obtained across the series connected diode and further diode.
18. In the camera of claim 17 comprising a source of potential, said means providing a current comprising an adjustable impedance coupled between the source of potential and the diode junction.
19. In the camera of claim 18 wherein said operational amplifier has an input for receiving power coupled across said source of potential.
20. A photometric circuit comprising: photo-voltaic means having first and second terminals between which current is passed proportional to received light; means for sensing the electrical signal across said first and second terminals and having an output circuit coupled to one of said terminals for maintaining a substantially 0 interterminal voltage across said terminals; and logarithmic compression means serially coupled between the other one of the terminals of the photo-voltaic means and a reference potential and responsive to the current provided by the photo-voltaic means for providing an output signal.
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