Optical semiconductor device
An encoder and optical technology, applied in the field of optical encoders, can solve the problems of reduced parallelism, narrowing of the distance between a light-emitting element 31 and a light-receiving element 32 and the like
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[0032] Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0033] (1) The first embodiment
[0034] figure 1 It is a plan view showing an example of the photodiode configuration of the optical encoder according to the embodiment of the present invention.
[0035] That is, also in the present embodiment, substantially rectangular signal photodiodes (1a, 1b, . . . , nd) are arranged in parallel. These signal photodiodes are sequentially connected to any one of the four-phase wiring lines 30a to 30d. That is, four-phase photodiode groups (1a-na, 1b-nb, 1c-nc, 1d-nd) connected in common are formed by the four-phase wirings 30a-30d, respectively. Furthermore, adjacent photodiodes (for example, 1a to 1d) are arranged so as to belong to different photodiode groups.
[0036] In addition, above and below these photodiodes for signals, photodiodes 103 for DC cancellation are provided. The formation of the photodiodes 103 for DC can...
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