Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1993-03-19
1995-02-21
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
359696, G02B 1500
Patent
active
053918665
ABSTRACT:
A feed screw (3) is coupled to a stepping motor (2) and a moving member (4) is provided along the feed screw (3). The moving member (4) includes a rack (7) that is meshed with the feed screw (3). The moving member (4) has a lens supporting member (9) secured to its lower end, and a light emitting element (13) and a slit (4) are fixed to the lens supporting member (9). A semiconductor position detecting element (15) is secured within a lens housing in association with the slit (14). If the position of a lens (L) is fluctuated by a shock or the like when or after an image is properly focused, a distance in which a light passed through the slit (14) from the light emitting element (13) is moved on the semiconductor position detecting element (15) is electrically converted to drive the motor (2), thereby the lens (L) being recovered to the properly-focused position. The number of teeth of the feed screw in which the teeth are skipped when the rack is disengaged is determined precisely. Then, the lens is moved by the distance corresponding to the fluctuated amount and is returned to the properly-focused position. Also, an electric power consumption can be reduced on the whole and the size of the whole of the apparatus can be reduced.
REFERENCES:
patent: 5016993 (1991-05-01), Akitake
patent: 5144491 (1992-09-01), Ushiro et al.
patent: 5150260 (1992-09-01), Chigira
patent: 5204710 (1993-04-01), Tsukamoto et al.
patent: 5291335 (1994-03-01), Ogino
Patent Abstracts of Japan vol. 16, No. 167 (P-1342) 22 Apr. 1992 & JP-A-04 15 609 (Matsushita Electric) 21 Jan. 1992.
Patent Abstracts of Japan vol. 15, No. 503 (P-1290) 19 Dec. 1991 & JP-A-03 217 806 (Matsushita Electric) 25 Sep. 1991.
Patent Abstracts of Japan vol. 16, No. 131 (P-1332) 3 Apr. 1992 & JP-A-03 294 810 (Matsushita Electric) 26 Dec. 1991.
Hoshino Mitsuo
Takano Atsushi
Kananen Ronald P.
Lee John R.
Nelms David C.
Sony Corporation
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