Abstract A radiation-sensitive semiconductor device, more particularly but not exclusively a photo detection arrangement for determining the position of a luminous spot. The device comprises a semiconductor body 1 having at least two radiation-sensitive diodes (4 to 7) and means for amplifying the photocurrent generated by the luminous spot. According to the invention, the means consist of transistors (14 to 17) arranged outside the area of the semiconductor body occupied by the radiation-sensitive diodes. Each transistor is assigned to and connected to a radiation-sensitive diode, while at least the active parts of the transistors are arranged more closely to each other in the semiconductor body than the diodes to which they are assigned. The invention further relates to a focusing arrangement comprising such a semiconductor photodetector.
A radiation-sensitive semiconductor device having a semiconductor body comprising at least two radiation-sensitive diodes, on which a luminous spot can be imaged, and means for amplifying the photocurrent generated by the luminous spot, characterized in that the said means comprise transistors, which are arranged outside the area in the semiconductor body occupied by the photodiodes, each transistor being assigned to and connected to a radiation-sensitive diode and at least the active parts of the transistors being arranged more closely to each other in the semiconductor body than the radiation-sensitive diodes to which they are assigned.
Claim 2
Dependent Claim
95 words
A radiation-sensitive semiconductor device having a semiconductor body comprising at least two radiation-sensitive diodes, on which a luminous spot can be imaged, and means for amplifying the photocurrent generated by the luminous spot, characterized in that the said means comprise transistors, which are arranged outside the area in the semiconductor body occupied by the photodiodes, each transistor being assigned to and connected to a radiation-sensitive diode and at least the active parts of the transistors being arranged more closely to each other in the semiconductor body than the radiation-sensitive diodes to which they are assigned.
Claim 3
Dependent Claim
27 words
A radiation-sensitive semiconductor device as claimed in Claim 1, characterized in that the transistors are arranged as closely as possible to each other in the semiconductor body.
Claim 4
Dependent Claim
35 words
A radiation-sensitive semiconductor device as claimed in Claim 1 or 2, characterized in that the radiation-sensitive diodes are arranged in a row and in that the transistors are arranged in a row substantially parallel thereto.
Claim 5
Dependent Claim
28 words
A radiation-sensitive semiconductor device as claimed in any one of the preceding Claims, characterized in that the device comprises four radiation-sensitive diodes arranged in quadrants and four transistors.
Claim 6
Dependent Claim
81 words
A focusing arrangement comprising means for projecting a light beam onto a surface, means for deflecting a part of the light beam and means for splitting up the deflected beam into at least two beams, which project luminous spots onto a photodetector, which generates signals for stabilizing the position of the said light beam with respect to the said surface, characterized in that as photodetector a radiation-sensitive semiconductor device as claimed in any one of Claims 1 to 3 is used.